1 /* Handle parameterized types (templates) for GNU -*- C++ -*-.
2 Copyright (C) 1992-2017 Free Software Foundation, Inc.
3 Written by Ken Raeburn (raeburn@cygnus.com) while at Watchmaker Computing.
4 Rewritten by Jason Merrill (jason@cygnus.com).
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3, or (at your option)
13 GCC is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
22 /* Known bugs or deficiencies include:
24 all methods must be provided in header files; can't use a source
25 file that contains only the method templates and "just win". */
29 #include "coretypes.h"
32 #include "stringpool.h"
35 #include "stor-layout.h"
37 #include "c-family/c-objc.h"
38 #include "cp-objcp-common.h"
40 #include "tree-iterator.h"
41 #include "type-utils.h"
43 #include "gcc-rich-location.h"
45 /* The type of functions taking a tree, and some additional data, and
47 typedef int (*tree_fn_t
) (tree
, void*);
49 /* The PENDING_TEMPLATES is a TREE_LIST of templates whose
50 instantiations have been deferred, either because their definitions
51 were not yet available, or because we were putting off doing the work. */
52 struct GTY ((chain_next ("%h.next"))) pending_template
{
53 struct pending_template
*next
;
54 struct tinst_level
*tinst
;
57 static GTY(()) struct pending_template
*pending_templates
;
58 static GTY(()) struct pending_template
*last_pending_template
;
60 int processing_template_parmlist
;
61 static int template_header_count
;
63 static GTY(()) tree saved_trees
;
64 static vec
<int> inline_parm_levels
;
66 static GTY(()) struct tinst_level
*current_tinst_level
;
68 static GTY(()) tree saved_access_scope
;
70 /* Live only within one (recursive) call to tsubst_expr. We use
71 this to pass the statement expression node from the STMT_EXPR
72 to the EXPR_STMT that is its result. */
73 static tree cur_stmt_expr
;
75 // -------------------------------------------------------------------------- //
76 // Local Specialization Stack
78 // Implementation of the RAII helper for creating new local
80 local_specialization_stack::local_specialization_stack (lss_policy policy
)
81 : saved (local_specializations
)
83 if (policy
== lss_blank
|| !saved
)
84 local_specializations
= new hash_map
<tree
, tree
>;
86 local_specializations
= new hash_map
<tree
, tree
>(*saved
);
89 local_specialization_stack::~local_specialization_stack ()
91 delete local_specializations
;
92 local_specializations
= saved
;
95 /* True if we've recursed into fn_type_unification too many times. */
96 static bool excessive_deduction_depth
;
98 struct GTY((for_user
)) spec_entry
105 struct spec_hasher
: ggc_ptr_hash
<spec_entry
>
107 static hashval_t
hash (spec_entry
*);
108 static bool equal (spec_entry
*, spec_entry
*);
111 static GTY (()) hash_table
<spec_hasher
> *decl_specializations
;
113 static GTY (()) hash_table
<spec_hasher
> *type_specializations
;
115 /* Contains canonical template parameter types. The vector is indexed by
116 the TEMPLATE_TYPE_IDX of the template parameter. Each element is a
117 TREE_LIST, whose TREE_VALUEs contain the canonical template
118 parameters of various types and levels. */
119 static GTY(()) vec
<tree
, va_gc
> *canonical_template_parms
;
121 #define UNIFY_ALLOW_NONE 0
122 #define UNIFY_ALLOW_MORE_CV_QUAL 1
123 #define UNIFY_ALLOW_LESS_CV_QUAL 2
124 #define UNIFY_ALLOW_DERIVED 4
125 #define UNIFY_ALLOW_INTEGER 8
126 #define UNIFY_ALLOW_OUTER_LEVEL 16
127 #define UNIFY_ALLOW_OUTER_MORE_CV_QUAL 32
128 #define UNIFY_ALLOW_OUTER_LESS_CV_QUAL 64
130 enum template_base_result
{
132 tbr_ambiguous_baseclass
,
136 static void push_access_scope (tree
);
137 static void pop_access_scope (tree
);
138 static bool resolve_overloaded_unification (tree
, tree
, tree
, tree
,
139 unification_kind_t
, int,
141 static int try_one_overload (tree
, tree
, tree
, tree
, tree
,
142 unification_kind_t
, int, bool, bool);
143 static int unify (tree
, tree
, tree
, tree
, int, bool);
144 static void add_pending_template (tree
);
145 static tree
reopen_tinst_level (struct tinst_level
*);
146 static tree
tsubst_initializer_list (tree
, tree
);
147 static tree
get_partial_spec_bindings (tree
, tree
, tree
);
148 static tree
coerce_template_parms (tree
, tree
, tree
, tsubst_flags_t
,
150 static tree
coerce_innermost_template_parms (tree
, tree
, tree
, tsubst_flags_t
,
152 static void tsubst_enum (tree
, tree
, tree
);
153 static tree
add_to_template_args (tree
, tree
);
154 static tree
add_outermost_template_args (tree
, tree
);
155 static bool check_instantiated_args (tree
, tree
, tsubst_flags_t
);
156 static int maybe_adjust_types_for_deduction (unification_kind_t
, tree
*, tree
*,
158 static int type_unification_real (tree
, tree
, tree
, const tree
*,
159 unsigned int, int, unification_kind_t
, int,
160 vec
<deferred_access_check
, va_gc
> **,
162 static void note_template_header (int);
163 static tree
convert_nontype_argument_function (tree
, tree
, tsubst_flags_t
);
164 static tree
convert_nontype_argument (tree
, tree
, tsubst_flags_t
);
165 static tree
convert_template_argument (tree
, tree
, tree
,
166 tsubst_flags_t
, int, tree
);
167 static tree
for_each_template_parm (tree
, tree_fn_t
, void*,
168 hash_set
<tree
> *, bool, tree_fn_t
= NULL
);
169 static tree
expand_template_argument_pack (tree
);
170 static tree
build_template_parm_index (int, int, int, tree
, tree
);
171 static bool inline_needs_template_parms (tree
, bool);
172 static void push_inline_template_parms_recursive (tree
, int);
173 static tree
reduce_template_parm_level (tree
, tree
, int, tree
, tsubst_flags_t
);
174 static int mark_template_parm (tree
, void *);
175 static int template_parm_this_level_p (tree
, void *);
176 static tree
tsubst_friend_function (tree
, tree
);
177 static tree
tsubst_friend_class (tree
, tree
);
178 static int can_complete_type_without_circularity (tree
);
179 static tree
get_bindings (tree
, tree
, tree
, bool);
180 static int template_decl_level (tree
);
181 static int check_cv_quals_for_unify (int, tree
, tree
);
182 static void template_parm_level_and_index (tree
, int*, int*);
183 static int unify_pack_expansion (tree
, tree
, tree
,
184 tree
, unification_kind_t
, bool, bool);
185 static tree
copy_template_args (tree
);
186 static tree
tsubst_template_arg (tree
, tree
, tsubst_flags_t
, tree
);
187 static tree
tsubst_template_args (tree
, tree
, tsubst_flags_t
, tree
);
188 static tree
tsubst_template_parms (tree
, tree
, tsubst_flags_t
);
189 static tree
most_specialized_partial_spec (tree
, tsubst_flags_t
);
190 static tree
tsubst_aggr_type (tree
, tree
, tsubst_flags_t
, tree
, int);
191 static tree
tsubst_arg_types (tree
, tree
, tree
, tsubst_flags_t
, tree
);
192 static tree
tsubst_function_type (tree
, tree
, tsubst_flags_t
, tree
);
193 static bool check_specialization_scope (void);
194 static tree
process_partial_specialization (tree
);
195 static void set_current_access_from_decl (tree
);
196 static enum template_base_result
get_template_base (tree
, tree
, tree
, tree
,
198 static tree
try_class_unification (tree
, tree
, tree
, tree
, bool);
199 static int coerce_template_template_parms (tree
, tree
, tsubst_flags_t
,
201 static bool template_template_parm_bindings_ok_p (tree
, tree
);
202 static void tsubst_default_arguments (tree
, tsubst_flags_t
);
203 static tree
for_each_template_parm_r (tree
*, int *, void *);
204 static tree
copy_default_args_to_explicit_spec_1 (tree
, tree
);
205 static void copy_default_args_to_explicit_spec (tree
);
206 static bool invalid_nontype_parm_type_p (tree
, tsubst_flags_t
);
207 static bool dependent_template_arg_p (tree
);
208 static bool any_template_arguments_need_structural_equality_p (tree
);
209 static bool dependent_type_p_r (tree
);
210 static tree
tsubst_copy (tree
, tree
, tsubst_flags_t
, tree
);
211 static tree
tsubst_decl (tree
, tree
, tsubst_flags_t
);
212 static void perform_typedefs_access_check (tree tmpl
, tree targs
);
213 static void append_type_to_template_for_access_check_1 (tree
, tree
, tree
,
215 static tree
listify (tree
);
216 static tree
listify_autos (tree
, tree
);
217 static tree
tsubst_template_parm (tree
, tree
, tsubst_flags_t
);
218 static tree
instantiate_alias_template (tree
, tree
, tsubst_flags_t
);
219 static bool complex_alias_template_p (const_tree tmpl
);
220 static tree
tsubst_attributes (tree
, tree
, tsubst_flags_t
, tree
);
221 static tree
canonicalize_expr_argument (tree
, tsubst_flags_t
);
222 static tree
make_argument_pack (tree
);
223 static void register_parameter_specializations (tree
, tree
);
225 /* Make the current scope suitable for access checking when we are
226 processing T. T can be FUNCTION_DECL for instantiated function
227 template, VAR_DECL for static member variable, or TYPE_DECL for
228 alias template (needed by instantiate_decl). */
231 push_access_scope (tree t
)
233 gcc_assert (VAR_OR_FUNCTION_DECL_P (t
)
234 || TREE_CODE (t
) == TYPE_DECL
);
236 if (DECL_FRIEND_CONTEXT (t
))
237 push_nested_class (DECL_FRIEND_CONTEXT (t
));
238 else if (DECL_CLASS_SCOPE_P (t
))
239 push_nested_class (DECL_CONTEXT (t
));
241 push_to_top_level ();
243 if (TREE_CODE (t
) == FUNCTION_DECL
)
245 saved_access_scope
= tree_cons
246 (NULL_TREE
, current_function_decl
, saved_access_scope
);
247 current_function_decl
= t
;
251 /* Restore the scope set up by push_access_scope. T is the node we
255 pop_access_scope (tree t
)
257 if (TREE_CODE (t
) == FUNCTION_DECL
)
259 current_function_decl
= TREE_VALUE (saved_access_scope
);
260 saved_access_scope
= TREE_CHAIN (saved_access_scope
);
263 if (DECL_FRIEND_CONTEXT (t
) || DECL_CLASS_SCOPE_P (t
))
266 pop_from_top_level ();
269 /* Do any processing required when DECL (a member template
270 declaration) is finished. Returns the TEMPLATE_DECL corresponding
271 to DECL, unless it is a specialization, in which case the DECL
272 itself is returned. */
275 finish_member_template_decl (tree decl
)
277 if (decl
== error_mark_node
)
278 return error_mark_node
;
280 gcc_assert (DECL_P (decl
));
282 if (TREE_CODE (decl
) == TYPE_DECL
)
286 type
= TREE_TYPE (decl
);
287 if (type
== error_mark_node
)
288 return error_mark_node
;
289 if (MAYBE_CLASS_TYPE_P (type
)
290 && CLASSTYPE_TEMPLATE_INFO (type
)
291 && !CLASSTYPE_TEMPLATE_SPECIALIZATION (type
))
293 tree tmpl
= CLASSTYPE_TI_TEMPLATE (type
);
294 check_member_template (tmpl
);
299 else if (TREE_CODE (decl
) == FIELD_DECL
)
300 error ("data member %qD cannot be a member template", decl
);
301 else if (DECL_TEMPLATE_INFO (decl
))
303 if (!DECL_TEMPLATE_SPECIALIZATION (decl
))
305 check_member_template (DECL_TI_TEMPLATE (decl
));
306 return DECL_TI_TEMPLATE (decl
);
312 error ("invalid member template declaration %qD", decl
);
314 return error_mark_node
;
317 /* Create a template info node. */
320 build_template_info (tree template_decl
, tree template_args
)
322 tree result
= make_node (TEMPLATE_INFO
);
323 TI_TEMPLATE (result
) = template_decl
;
324 TI_ARGS (result
) = template_args
;
328 /* Return the template info node corresponding to T, whatever T is. */
331 get_template_info (const_tree t
)
333 tree tinfo
= NULL_TREE
;
335 if (!t
|| t
== error_mark_node
)
338 if (TREE_CODE (t
) == NAMESPACE_DECL
339 || TREE_CODE (t
) == PARM_DECL
)
342 if (DECL_P (t
) && DECL_LANG_SPECIFIC (t
))
343 tinfo
= DECL_TEMPLATE_INFO (t
);
345 if (!tinfo
&& DECL_IMPLICIT_TYPEDEF_P (t
))
348 if (OVERLOAD_TYPE_P (t
))
349 tinfo
= TYPE_TEMPLATE_INFO (t
);
350 else if (TREE_CODE (t
) == BOUND_TEMPLATE_TEMPLATE_PARM
)
351 tinfo
= TEMPLATE_TEMPLATE_PARM_TEMPLATE_INFO (t
);
356 /* Returns the template nesting level of the indicated class TYPE.
366 A<T>::B<U> has depth two, while A<T> has depth one.
367 Both A<T>::B<int> and A<int>::B<U> have depth one, if
368 they are instantiations, not specializations.
370 This function is guaranteed to return 0 if passed NULL_TREE so
371 that, for example, `template_class_depth (current_class_type)' is
375 template_class_depth (tree type
)
379 for (depth
= 0; type
&& TREE_CODE (type
) != NAMESPACE_DECL
; )
381 tree tinfo
= get_template_info (type
);
383 if (tinfo
&& PRIMARY_TEMPLATE_P (TI_TEMPLATE (tinfo
))
384 && uses_template_parms (INNERMOST_TEMPLATE_ARGS (TI_ARGS (tinfo
))))
388 type
= CP_DECL_CONTEXT (type
);
389 else if (LAMBDA_TYPE_P (type
))
390 type
= LAMBDA_TYPE_EXTRA_SCOPE (type
);
392 type
= CP_TYPE_CONTEXT (type
);
398 /* Subroutine of maybe_begin_member_template_processing.
399 Returns true if processing DECL needs us to push template parms. */
402 inline_needs_template_parms (tree decl
, bool nsdmi
)
404 if (!decl
|| (!nsdmi
&& ! DECL_TEMPLATE_INFO (decl
)))
407 return (TMPL_PARMS_DEPTH (DECL_TEMPLATE_PARMS (most_general_template (decl
)))
408 > (processing_template_decl
+ DECL_TEMPLATE_SPECIALIZATION (decl
)));
411 /* Subroutine of maybe_begin_member_template_processing.
412 Push the template parms in PARMS, starting from LEVELS steps into the
413 chain, and ending at the beginning, since template parms are listed
417 push_inline_template_parms_recursive (tree parmlist
, int levels
)
419 tree parms
= TREE_VALUE (parmlist
);
423 push_inline_template_parms_recursive (TREE_CHAIN (parmlist
), levels
- 1);
425 ++processing_template_decl
;
426 current_template_parms
427 = tree_cons (size_int (processing_template_decl
),
428 parms
, current_template_parms
);
429 TEMPLATE_PARMS_FOR_INLINE (current_template_parms
) = 1;
431 begin_scope (TREE_VEC_LENGTH (parms
) ? sk_template_parms
: sk_template_spec
,
433 for (i
= 0; i
< TREE_VEC_LENGTH (parms
); ++i
)
435 tree parm
= TREE_VALUE (TREE_VEC_ELT (parms
, i
));
437 if (error_operand_p (parm
))
440 gcc_assert (DECL_P (parm
));
442 switch (TREE_CODE (parm
))
450 /* Push the CONST_DECL. */
451 pushdecl (TEMPLATE_PARM_DECL (DECL_INITIAL (parm
)));
460 /* Restore the template parameter context for a member template, a
461 friend template defined in a class definition, or a non-template
462 member of template class. */
465 maybe_begin_member_template_processing (tree decl
)
469 bool nsdmi
= TREE_CODE (decl
) == FIELD_DECL
;
473 tree ctx
= DECL_CONTEXT (decl
);
474 decl
= (CLASSTYPE_TEMPLATE_INFO (ctx
)
475 /* Disregard full specializations (c++/60999). */
476 && uses_template_parms (ctx
)
477 ? CLASSTYPE_TI_TEMPLATE (ctx
) : NULL_TREE
);
480 if (inline_needs_template_parms (decl
, nsdmi
))
482 parms
= DECL_TEMPLATE_PARMS (most_general_template (decl
));
483 levels
= TMPL_PARMS_DEPTH (parms
) - processing_template_decl
;
485 if (DECL_TEMPLATE_SPECIALIZATION (decl
))
488 parms
= TREE_CHAIN (parms
);
491 push_inline_template_parms_recursive (parms
, levels
);
494 /* Remember how many levels of template parameters we pushed so that
495 we can pop them later. */
496 inline_parm_levels
.safe_push (levels
);
499 /* Undo the effects of maybe_begin_member_template_processing. */
502 maybe_end_member_template_processing (void)
507 if (inline_parm_levels
.length () == 0)
510 last
= inline_parm_levels
.pop ();
511 for (i
= 0; i
< last
; ++i
)
513 --processing_template_decl
;
514 current_template_parms
= TREE_CHAIN (current_template_parms
);
519 /* Return a new template argument vector which contains all of ARGS,
520 but has as its innermost set of arguments the EXTRA_ARGS. */
523 add_to_template_args (tree args
, tree extra_args
)
530 if (args
== NULL_TREE
|| extra_args
== error_mark_node
)
533 extra_depth
= TMPL_ARGS_DEPTH (extra_args
);
534 new_args
= make_tree_vec (TMPL_ARGS_DEPTH (args
) + extra_depth
);
536 for (i
= 1; i
<= TMPL_ARGS_DEPTH (args
); ++i
)
537 SET_TMPL_ARGS_LEVEL (new_args
, i
, TMPL_ARGS_LEVEL (args
, i
));
539 for (j
= 1; j
<= extra_depth
; ++j
, ++i
)
540 SET_TMPL_ARGS_LEVEL (new_args
, i
, TMPL_ARGS_LEVEL (extra_args
, j
));
545 /* Like add_to_template_args, but only the outermost ARGS are added to
546 the EXTRA_ARGS. In particular, all but TMPL_ARGS_DEPTH
547 (EXTRA_ARGS) levels are added. This function is used to combine
548 the template arguments from a partial instantiation with the
549 template arguments used to attain the full instantiation from the
550 partial instantiation. */
553 add_outermost_template_args (tree args
, tree extra_args
)
557 /* If there are more levels of EXTRA_ARGS than there are ARGS,
558 something very fishy is going on. */
559 gcc_assert (TMPL_ARGS_DEPTH (args
) >= TMPL_ARGS_DEPTH (extra_args
));
561 /* If *all* the new arguments will be the EXTRA_ARGS, just return
563 if (TMPL_ARGS_DEPTH (args
) == TMPL_ARGS_DEPTH (extra_args
))
566 /* For the moment, we make ARGS look like it contains fewer levels. */
567 TREE_VEC_LENGTH (args
) -= TMPL_ARGS_DEPTH (extra_args
);
569 new_args
= add_to_template_args (args
, extra_args
);
571 /* Now, we restore ARGS to its full dimensions. */
572 TREE_VEC_LENGTH (args
) += TMPL_ARGS_DEPTH (extra_args
);
577 /* Return the N levels of innermost template arguments from the ARGS. */
580 get_innermost_template_args (tree args
, int n
)
588 /* If N is 1, just return the innermost set of template arguments. */
590 return TMPL_ARGS_LEVEL (args
, TMPL_ARGS_DEPTH (args
));
592 /* If we're not removing anything, just return the arguments we were
594 extra_levels
= TMPL_ARGS_DEPTH (args
) - n
;
595 gcc_assert (extra_levels
>= 0);
596 if (extra_levels
== 0)
599 /* Make a new set of arguments, not containing the outer arguments. */
600 new_args
= make_tree_vec (n
);
601 for (i
= 1; i
<= n
; ++i
)
602 SET_TMPL_ARGS_LEVEL (new_args
, i
,
603 TMPL_ARGS_LEVEL (args
, i
+ extra_levels
));
608 /* The inverse of get_innermost_template_args: Return all but the innermost
609 EXTRA_LEVELS levels of template arguments from the ARGS. */
612 strip_innermost_template_args (tree args
, int extra_levels
)
615 int n
= TMPL_ARGS_DEPTH (args
) - extra_levels
;
620 /* If N is 1, just return the outermost set of template arguments. */
622 return TMPL_ARGS_LEVEL (args
, 1);
624 /* If we're not removing anything, just return the arguments we were
626 gcc_assert (extra_levels
>= 0);
627 if (extra_levels
== 0)
630 /* Make a new set of arguments, not containing the inner arguments. */
631 new_args
= make_tree_vec (n
);
632 for (i
= 1; i
<= n
; ++i
)
633 SET_TMPL_ARGS_LEVEL (new_args
, i
,
634 TMPL_ARGS_LEVEL (args
, i
));
639 /* We've got a template header coming up; push to a new level for storing
643 begin_template_parm_list (void)
645 /* We use a non-tag-transparent scope here, which causes pushtag to
646 put tags in this scope, rather than in the enclosing class or
647 namespace scope. This is the right thing, since we want
648 TEMPLATE_DECLS, and not TYPE_DECLS for template classes. For a
649 global template class, push_template_decl handles putting the
650 TEMPLATE_DECL into top-level scope. For a nested template class,
653 template <class T> struct S1 {
654 template <class T> struct S2 {};
657 pushtag contains special code to insert the TEMPLATE_DECL for S2
658 at the right scope. */
659 begin_scope (sk_template_parms
, NULL
);
660 ++processing_template_decl
;
661 ++processing_template_parmlist
;
662 note_template_header (0);
664 /* Add a dummy parameter level while we process the parameter list. */
665 current_template_parms
666 = tree_cons (size_int (processing_template_decl
),
668 current_template_parms
);
671 /* This routine is called when a specialization is declared. If it is
672 invalid to declare a specialization here, an error is reported and
673 false is returned, otherwise this routine will return true. */
676 check_specialization_scope (void)
678 tree scope
= current_scope ();
682 An explicit specialization shall be declared in the namespace of
683 which the template is a member, or, for member templates, in the
684 namespace of which the enclosing class or enclosing class
685 template is a member. An explicit specialization of a member
686 function, member class or static data member of a class template
687 shall be declared in the namespace of which the class template
689 if (scope
&& TREE_CODE (scope
) != NAMESPACE_DECL
)
691 error ("explicit specialization in non-namespace scope %qD", scope
);
697 In an explicit specialization declaration for a member of a class
698 template or a member template that appears in namespace scope,
699 the member template and some of its enclosing class templates may
700 remain unspecialized, except that the declaration shall not
701 explicitly specialize a class member template if its enclosing
702 class templates are not explicitly specialized as well. */
703 if (current_template_parms
)
705 error ("enclosing class templates are not explicitly specialized");
712 /* We've just seen template <>. */
715 begin_specialization (void)
717 begin_scope (sk_template_spec
, NULL
);
718 note_template_header (1);
719 return check_specialization_scope ();
722 /* Called at then end of processing a declaration preceded by
726 end_specialization (void)
729 reset_specialization ();
732 /* Any template <>'s that we have seen thus far are not referring to a
733 function specialization. */
736 reset_specialization (void)
738 processing_specialization
= 0;
739 template_header_count
= 0;
742 /* We've just seen a template header. If SPECIALIZATION is nonzero,
743 it was of the form template <>. */
746 note_template_header (int specialization
)
748 processing_specialization
= specialization
;
749 template_header_count
++;
752 /* We're beginning an explicit instantiation. */
755 begin_explicit_instantiation (void)
757 gcc_assert (!processing_explicit_instantiation
);
758 processing_explicit_instantiation
= true;
763 end_explicit_instantiation (void)
765 gcc_assert (processing_explicit_instantiation
);
766 processing_explicit_instantiation
= false;
769 /* An explicit specialization or partial specialization of TMPL is being
770 declared. Check that the namespace in which the specialization is
771 occurring is permissible. Returns false iff it is invalid to
772 specialize TMPL in the current namespace. */
775 check_specialization_namespace (tree tmpl
)
777 tree tpl_ns
= decl_namespace_context (tmpl
);
781 An explicit specialization shall be declared in a namespace enclosing the
782 specialized template. An explicit specialization whose declarator-id is
783 not qualified shall be declared in the nearest enclosing namespace of the
784 template, or, if the namespace is inline (7.3.1), any namespace from its
785 enclosing namespace set. */
786 if (current_scope() != DECL_CONTEXT (tmpl
)
787 && !at_namespace_scope_p ())
789 error ("specialization of %qD must appear at namespace scope", tmpl
);
793 if (is_nested_namespace (current_namespace
, tpl_ns
, cxx_dialect
< cxx11
))
794 /* Same or enclosing namespace. */
798 permerror (input_location
,
799 "specialization of %qD in different namespace", tmpl
);
800 inform (DECL_SOURCE_LOCATION (tmpl
),
801 " from definition of %q#D", tmpl
);
806 /* SPEC is an explicit instantiation. Check that it is valid to
807 perform this explicit instantiation in the current namespace. */
810 check_explicit_instantiation_namespace (tree spec
)
814 /* DR 275: An explicit instantiation shall appear in an enclosing
815 namespace of its template. */
816 ns
= decl_namespace_context (spec
);
817 if (!is_nested_namespace (current_namespace
, ns
))
818 permerror (input_location
, "explicit instantiation of %qD in namespace %qD "
819 "(which does not enclose namespace %qD)",
820 spec
, current_namespace
, ns
);
823 // Returns the type of a template specialization only if that
824 // specialization needs to be defined. Otherwise (e.g., if the type has
825 // already been defined), the function returns NULL_TREE.
827 maybe_new_partial_specialization (tree type
)
829 // An implicit instantiation of an incomplete type implies
830 // the definition of a new class template.
832 // template<typename T>
835 // template<typename T>
838 // Here, S<T*> is an implicit instantiation of S whose type
840 if (CLASSTYPE_IMPLICIT_INSTANTIATION (type
) && !COMPLETE_TYPE_P (type
))
843 // It can also be the case that TYPE is a completed specialization.
844 // Continuing the previous example, suppose we also declare:
846 // template<typename T>
847 // requires Integral<T>
850 // Here, S<T*> refers to the specialization S<T*> defined
851 // above. However, we need to differentiate definitions because
852 // we intend to define a new partial specialization. In this case,
853 // we rely on the fact that the constraints are different for
854 // this declaration than that above.
856 // Note that we also get here for injected class names and
857 // late-parsed template definitions. We must ensure that we
858 // do not create new type declarations for those cases.
859 if (flag_concepts
&& CLASSTYPE_TEMPLATE_SPECIALIZATION (type
))
861 tree tmpl
= CLASSTYPE_TI_TEMPLATE (type
);
862 tree args
= CLASSTYPE_TI_ARGS (type
);
864 // If there are no template parameters, this cannot be a new
865 // partial template specializtion?
866 if (!current_template_parms
)
869 // The injected-class-name is not a new partial specialization.
870 if (DECL_SELF_REFERENCE_P (TYPE_NAME (type
)))
873 // If the constraints are not the same as those of the primary
874 // then, we can probably create a new specialization.
875 tree type_constr
= current_template_constraints ();
877 if (type
== TREE_TYPE (tmpl
))
879 tree main_constr
= get_constraints (tmpl
);
880 if (equivalent_constraints (type_constr
, main_constr
))
884 // Also, if there's a pre-existing specialization with matching
885 // constraints, then this also isn't new.
886 tree specs
= DECL_TEMPLATE_SPECIALIZATIONS (tmpl
);
889 tree spec_tmpl
= TREE_VALUE (specs
);
890 tree spec_args
= TREE_PURPOSE (specs
);
891 tree spec_constr
= get_constraints (spec_tmpl
);
892 if (comp_template_args (args
, spec_args
)
893 && equivalent_constraints (type_constr
, spec_constr
))
895 specs
= TREE_CHAIN (specs
);
898 // Create a new type node (and corresponding type decl)
899 // for the newly declared specialization.
900 tree t
= make_class_type (TREE_CODE (type
));
901 CLASSTYPE_DECLARED_CLASS (t
) = CLASSTYPE_DECLARED_CLASS (type
);
902 SET_TYPE_TEMPLATE_INFO (t
, build_template_info (tmpl
, args
));
904 /* We only need a separate type node for storing the definition of this
905 partial specialization; uses of S<T*> are unconstrained, so all are
906 equivalent. So keep TYPE_CANONICAL the same. */
907 TYPE_CANONICAL (t
) = TYPE_CANONICAL (type
);
909 // Build the corresponding type decl.
910 tree d
= create_implicit_typedef (DECL_NAME (tmpl
), t
);
911 DECL_CONTEXT (d
) = TYPE_CONTEXT (t
);
912 DECL_SOURCE_LOCATION (d
) = input_location
;
920 /* The TYPE is being declared. If it is a template type, that means it
921 is a partial specialization. Do appropriate error-checking. */
924 maybe_process_partial_specialization (tree type
)
928 if (type
== error_mark_node
)
929 return error_mark_node
;
931 /* A lambda that appears in specialization context is not itself a
933 if (CLASS_TYPE_P (type
) && CLASSTYPE_LAMBDA_EXPR (type
))
936 if (TREE_CODE (type
) == BOUND_TEMPLATE_TEMPLATE_PARM
)
938 error ("name of class shadows template template parameter %qD",
940 return error_mark_node
;
943 context
= TYPE_CONTEXT (type
);
945 if (TYPE_ALIAS_P (type
))
947 tree tinfo
= TYPE_ALIAS_TEMPLATE_INFO (type
);
949 if (tinfo
&& DECL_ALIAS_TEMPLATE_P (TI_TEMPLATE (tinfo
)))
950 error ("specialization of alias template %qD",
951 TI_TEMPLATE (tinfo
));
953 error ("explicit specialization of non-template %qT", type
);
954 return error_mark_node
;
956 else if (CLASS_TYPE_P (type
) && CLASSTYPE_USE_TEMPLATE (type
))
958 /* This is for ordinary explicit specialization and partial
959 specialization of a template class such as:
961 template <> class C<int>;
965 template <class T> class C<T*>;
967 Make sure that `C<int>' and `C<T*>' are implicit instantiations. */
969 if (tree t
= maybe_new_partial_specialization (type
))
971 if (!check_specialization_namespace (CLASSTYPE_TI_TEMPLATE (t
))
972 && !at_namespace_scope_p ())
973 return error_mark_node
;
974 SET_CLASSTYPE_TEMPLATE_SPECIALIZATION (t
);
975 DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (t
)) = input_location
;
976 if (processing_template_decl
)
978 tree decl
= push_template_decl (TYPE_MAIN_DECL (t
));
979 if (decl
== error_mark_node
)
980 return error_mark_node
;
981 return TREE_TYPE (decl
);
984 else if (CLASSTYPE_TEMPLATE_INSTANTIATION (type
))
985 error ("specialization of %qT after instantiation", type
);
986 else if (errorcount
&& !processing_specialization
987 && CLASSTYPE_TEMPLATE_SPECIALIZATION (type
)
988 && !uses_template_parms (CLASSTYPE_TI_ARGS (type
)))
989 /* Trying to define a specialization either without a template<> header
990 or in an inappropriate place. We've already given an error, so just
991 bail now so we don't actually define the specialization. */
992 return error_mark_node
;
994 else if (CLASS_TYPE_P (type
)
995 && !CLASSTYPE_USE_TEMPLATE (type
)
996 && CLASSTYPE_TEMPLATE_INFO (type
)
997 && context
&& CLASS_TYPE_P (context
)
998 && CLASSTYPE_TEMPLATE_INFO (context
))
1000 /* This is for an explicit specialization of member class
1001 template according to [temp.expl.spec/18]:
1003 template <> template <class U> class C<int>::D;
1005 The context `C<int>' must be an implicit instantiation.
1006 Otherwise this is just a member class template declared
1009 template <> class C<int> { template <class U> class D; };
1010 template <> template <class U> class C<int>::D;
1012 In the first case, `C<int>::D' is a specialization of `C<T>::D'
1013 while in the second case, `C<int>::D' is a primary template
1014 and `C<T>::D' may not exist. */
1016 if (CLASSTYPE_IMPLICIT_INSTANTIATION (context
)
1017 && !COMPLETE_TYPE_P (type
))
1020 tree tmpl
= CLASSTYPE_TI_TEMPLATE (type
);
1022 if (current_namespace
1023 != decl_namespace_context (tmpl
))
1025 permerror (input_location
,
1026 "specializing %q#T in different namespace", type
);
1027 permerror (DECL_SOURCE_LOCATION (tmpl
),
1028 " from definition of %q#D", tmpl
);
1031 /* Check for invalid specialization after instantiation:
1033 template <> template <> class C<int>::D<int>;
1034 template <> template <class U> class C<int>::D; */
1036 for (t
= DECL_TEMPLATE_INSTANTIATIONS (tmpl
);
1037 t
; t
= TREE_CHAIN (t
))
1039 tree inst
= TREE_VALUE (t
);
1040 if (CLASSTYPE_TEMPLATE_SPECIALIZATION (inst
)
1041 || !COMPLETE_OR_OPEN_TYPE_P (inst
))
1043 /* We already have a full specialization of this partial
1044 instantiation, or a full specialization has been
1045 looked up but not instantiated. Reassign it to the
1046 new member specialization template. */
1050 elt
.tmpl
= most_general_template (tmpl
);
1051 elt
.args
= CLASSTYPE_TI_ARGS (inst
);
1054 type_specializations
->remove_elt (&elt
);
1057 elt
.args
= INNERMOST_TEMPLATE_ARGS (elt
.args
);
1060 = type_specializations
->find_slot (&elt
, INSERT
);
1061 entry
= ggc_alloc
<spec_entry
> ();
1066 /* But if we've had an implicit instantiation, that's a
1067 problem ([temp.expl.spec]/6). */
1068 error ("specialization %qT after instantiation %qT",
1072 /* Mark TYPE as a specialization. And as a result, we only
1073 have one level of template argument for the innermost
1075 SET_CLASSTYPE_TEMPLATE_SPECIALIZATION (type
);
1076 DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (type
)) = input_location
;
1077 CLASSTYPE_TI_ARGS (type
)
1078 = INNERMOST_TEMPLATE_ARGS (CLASSTYPE_TI_ARGS (type
));
1081 else if (processing_specialization
)
1083 /* Someday C++0x may allow for enum template specialization. */
1084 if (cxx_dialect
> cxx98
&& TREE_CODE (type
) == ENUMERAL_TYPE
1085 && CLASS_TYPE_P (context
) && CLASSTYPE_USE_TEMPLATE (context
))
1086 pedwarn (input_location
, OPT_Wpedantic
, "template specialization "
1087 "of %qD not allowed by ISO C++", type
);
1090 error ("explicit specialization of non-template %qT", type
);
1091 return error_mark_node
;
1098 /* Returns nonzero if we can optimize the retrieval of specializations
1099 for TMPL, a TEMPLATE_DECL. In particular, for such a template, we
1100 do not use DECL_TEMPLATE_SPECIALIZATIONS at all. */
1103 optimize_specialization_lookup_p (tree tmpl
)
1105 return (DECL_FUNCTION_TEMPLATE_P (tmpl
)
1106 && DECL_CLASS_SCOPE_P (tmpl
)
1107 /* DECL_CLASS_SCOPE_P holds of T::f even if T is a template
1109 && CLASS_TYPE_P (DECL_CONTEXT (tmpl
))
1110 /* The optimized lookup depends on the fact that the
1111 template arguments for the member function template apply
1112 purely to the containing class, which is not true if the
1113 containing class is an explicit or partial
1115 && !CLASSTYPE_TEMPLATE_SPECIALIZATION (DECL_CONTEXT (tmpl
))
1116 && !DECL_MEMBER_TEMPLATE_P (tmpl
)
1117 && !DECL_CONV_FN_P (tmpl
)
1118 /* It is possible to have a template that is not a member
1119 template and is not a member of a template class:
1121 template <typename T>
1122 struct S { friend A::f(); };
1124 Here, the friend function is a template, but the context does
1125 not have template information. The optimized lookup relies
1126 on having ARGS be the template arguments for both the class
1127 and the function template. */
1128 && !DECL_FRIEND_P (DECL_TEMPLATE_RESULT (tmpl
)));
1131 /* Make sure ARGS doesn't use any inappropriate typedefs; we should have
1132 gone through coerce_template_parms by now. */
1135 verify_unstripped_args (tree args
)
1137 ++processing_template_decl
;
1138 if (!any_dependent_template_arguments_p (args
))
1140 tree inner
= INNERMOST_TEMPLATE_ARGS (args
);
1141 for (int i
= 0; i
< TREE_VEC_LENGTH (inner
); ++i
)
1143 tree arg
= TREE_VEC_ELT (inner
, i
);
1144 if (TREE_CODE (arg
) == TEMPLATE_DECL
)
1146 else if (TYPE_P (arg
))
1147 gcc_assert (strip_typedefs (arg
, NULL
) == arg
);
1148 else if (strip_typedefs (TREE_TYPE (arg
), NULL
) != TREE_TYPE (arg
))
1149 /* Allow typedefs on the type of a non-type argument, since a
1150 parameter can have them. */;
1152 gcc_assert (strip_typedefs_expr (arg
, NULL
) == arg
);
1155 --processing_template_decl
;
1158 /* Retrieve the specialization (in the sense of [temp.spec] - a
1159 specialization is either an instantiation or an explicit
1160 specialization) of TMPL for the given template ARGS. If there is
1161 no such specialization, return NULL_TREE. The ARGS are a vector of
1162 arguments, or a vector of vectors of arguments, in the case of
1163 templates with more than one level of parameters.
1165 If TMPL is a type template and CLASS_SPECIALIZATIONS_P is true,
1166 then we search for a partial specialization matching ARGS. This
1167 parameter is ignored if TMPL is not a class template.
1169 We can also look up a FIELD_DECL, if it is a lambda capture pack; the
1170 result is a NONTYPE_ARGUMENT_PACK. */
1173 retrieve_specialization (tree tmpl
, tree args
, hashval_t hash
)
1175 if (tmpl
== NULL_TREE
)
1178 if (args
== error_mark_node
)
1181 gcc_assert (TREE_CODE (tmpl
) == TEMPLATE_DECL
1182 || TREE_CODE (tmpl
) == FIELD_DECL
);
1184 /* There should be as many levels of arguments as there are
1185 levels of parameters. */
1186 gcc_assert (TMPL_ARGS_DEPTH (args
)
1187 == (TREE_CODE (tmpl
) == TEMPLATE_DECL
1188 ? TMPL_PARMS_DEPTH (DECL_TEMPLATE_PARMS (tmpl
))
1189 : template_class_depth (DECL_CONTEXT (tmpl
))));
1192 verify_unstripped_args (args
);
1194 /* Lambda functions in templates aren't instantiated normally, but through
1195 tsubst_lambda_expr. */
1196 if (lambda_fn_in_template_p (tmpl
))
1199 if (optimize_specialization_lookup_p (tmpl
))
1201 /* The template arguments actually apply to the containing
1202 class. Find the class specialization with those
1204 tree class_template
= CLASSTYPE_TI_TEMPLATE (DECL_CONTEXT (tmpl
));
1205 tree class_specialization
1206 = retrieve_specialization (class_template
, args
, 0);
1207 if (!class_specialization
)
1210 /* Find the instance of TMPL. */
1211 tree fns
= get_class_binding (class_specialization
, DECL_NAME (tmpl
));
1212 for (ovl_iterator
iter (fns
); iter
; ++iter
)
1215 if (DECL_TEMPLATE_INFO (fn
) && DECL_TI_TEMPLATE (fn
) == tmpl
1216 /* using-declarations can add base methods to the method vec,
1217 and we don't want those here. */
1218 && DECL_CONTEXT (fn
) == class_specialization
)
1227 hash_table
<spec_hasher
> *specializations
;
1231 elt
.spec
= NULL_TREE
;
1233 if (DECL_CLASS_TEMPLATE_P (tmpl
))
1234 specializations
= type_specializations
;
1236 specializations
= decl_specializations
;
1239 hash
= spec_hasher::hash (&elt
);
1240 found
= specializations
->find_with_hash (&elt
, hash
);
1248 /* Like retrieve_specialization, but for local declarations. */
1251 retrieve_local_specialization (tree tmpl
)
1253 if (local_specializations
== NULL
)
1256 tree
*slot
= local_specializations
->get (tmpl
);
1257 return slot
? *slot
: NULL_TREE
;
1260 /* Returns nonzero iff DECL is a specialization of TMPL. */
1263 is_specialization_of (tree decl
, tree tmpl
)
1267 if (TREE_CODE (decl
) == FUNCTION_DECL
)
1271 t
= DECL_TEMPLATE_INFO (t
) ? DECL_TI_TEMPLATE (t
) : NULL_TREE
)
1277 gcc_assert (TREE_CODE (decl
) == TYPE_DECL
);
1279 for (t
= TREE_TYPE (decl
);
1281 t
= CLASSTYPE_USE_TEMPLATE (t
)
1282 ? TREE_TYPE (CLASSTYPE_TI_TEMPLATE (t
)) : NULL_TREE
)
1283 if (same_type_ignoring_top_level_qualifiers_p (t
, TREE_TYPE (tmpl
)))
1290 /* Returns nonzero iff DECL is a specialization of friend declaration
1291 FRIEND_DECL according to [temp.friend]. */
1294 is_specialization_of_friend (tree decl
, tree friend_decl
)
1296 bool need_template
= true;
1299 gcc_assert (TREE_CODE (decl
) == FUNCTION_DECL
1300 || TREE_CODE (decl
) == TYPE_DECL
);
1302 /* For [temp.friend/6] when FRIEND_DECL is an ordinary member function
1303 of a template class, we want to check if DECL is a specialization
1305 if (TREE_CODE (friend_decl
) == FUNCTION_DECL
1306 && DECL_TEMPLATE_INFO (friend_decl
)
1307 && !DECL_USE_TEMPLATE (friend_decl
))
1309 /* We want a TEMPLATE_DECL for `is_specialization_of'. */
1310 friend_decl
= DECL_TI_TEMPLATE (friend_decl
);
1311 need_template
= false;
1313 else if (TREE_CODE (friend_decl
) == TEMPLATE_DECL
1314 && !PRIMARY_TEMPLATE_P (friend_decl
))
1315 need_template
= false;
1317 /* There is nothing to do if this is not a template friend. */
1318 if (TREE_CODE (friend_decl
) != TEMPLATE_DECL
)
1321 if (is_specialization_of (decl
, friend_decl
))
1325 A member of a class template may be declared to be a friend of a
1326 non-template class. In this case, the corresponding member of
1327 every specialization of the class template is a friend of the
1328 class granting friendship.
1330 For example, given a template friend declaration
1332 template <class T> friend void A<T>::f();
1334 the member function below is considered a friend
1336 template <> struct A<int> {
1340 For this type of template friend, TEMPLATE_DEPTH below will be
1341 nonzero. To determine if DECL is a friend of FRIEND, we first
1342 check if the enclosing class is a specialization of another. */
1344 template_depth
= template_class_depth (CP_DECL_CONTEXT (friend_decl
));
1346 && DECL_CLASS_SCOPE_P (decl
)
1347 && is_specialization_of (TYPE_NAME (DECL_CONTEXT (decl
)),
1348 CLASSTYPE_TI_TEMPLATE (DECL_CONTEXT (friend_decl
))))
1350 /* Next, we check the members themselves. In order to handle
1351 a few tricky cases, such as when FRIEND_DECL's are
1353 template <class T> friend void A<T>::g(T t);
1354 template <class T> template <T t> friend void A<T>::h();
1358 void A<int>::g(int);
1359 template <int> void A<int>::h();
1361 we need to figure out ARGS, the template arguments from
1362 the context of DECL. This is required for template substitution
1363 of `T' in the function parameter of `g' and template parameter
1364 of `h' in the above examples. Here ARGS corresponds to `int'. */
1366 tree context
= DECL_CONTEXT (decl
);
1367 tree args
= NULL_TREE
;
1368 int current_depth
= 0;
1370 while (current_depth
< template_depth
)
1372 if (CLASSTYPE_TEMPLATE_INFO (context
))
1374 if (current_depth
== 0)
1375 args
= TYPE_TI_ARGS (context
);
1377 args
= add_to_template_args (TYPE_TI_ARGS (context
), args
);
1380 context
= TYPE_CONTEXT (context
);
1383 if (TREE_CODE (decl
) == FUNCTION_DECL
)
1388 tree friend_args_type
;
1389 tree decl_args_type
;
1391 /* Make sure that both DECL and FRIEND_DECL are templates or
1393 is_template
= DECL_TEMPLATE_INFO (decl
)
1394 && PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl
));
1395 if (need_template
^ is_template
)
1397 else if (is_template
)
1399 /* If both are templates, check template parameter list. */
1401 = tsubst_template_parms (DECL_TEMPLATE_PARMS (friend_decl
),
1403 if (!comp_template_parms
1404 (DECL_TEMPLATE_PARMS (DECL_TI_TEMPLATE (decl
)),
1408 decl_type
= TREE_TYPE (DECL_TI_TEMPLATE (decl
));
1411 decl_type
= TREE_TYPE (decl
);
1413 friend_type
= tsubst_function_type (TREE_TYPE (friend_decl
), args
,
1414 tf_none
, NULL_TREE
);
1415 if (friend_type
== error_mark_node
)
1418 /* Check if return types match. */
1419 if (!same_type_p (TREE_TYPE (decl_type
), TREE_TYPE (friend_type
)))
1422 /* Check if function parameter types match, ignoring the
1423 `this' parameter. */
1424 friend_args_type
= TYPE_ARG_TYPES (friend_type
);
1425 decl_args_type
= TYPE_ARG_TYPES (decl_type
);
1426 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (friend_decl
))
1427 friend_args_type
= TREE_CHAIN (friend_args_type
);
1428 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (decl
))
1429 decl_args_type
= TREE_CHAIN (decl_args_type
);
1431 return compparms (decl_args_type
, friend_args_type
);
1435 /* DECL is a TYPE_DECL */
1437 tree decl_type
= TREE_TYPE (decl
);
1439 /* Make sure that both DECL and FRIEND_DECL are templates or
1442 = CLASSTYPE_TEMPLATE_INFO (decl_type
)
1443 && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (decl_type
));
1445 if (need_template
^ is_template
)
1447 else if (is_template
)
1450 /* If both are templates, check the name of the two
1451 TEMPLATE_DECL's first because is_friend didn't. */
1452 if (DECL_NAME (CLASSTYPE_TI_TEMPLATE (decl_type
))
1453 != DECL_NAME (friend_decl
))
1456 /* Now check template parameter list. */
1458 = tsubst_template_parms (DECL_TEMPLATE_PARMS (friend_decl
),
1460 return comp_template_parms
1461 (DECL_TEMPLATE_PARMS (CLASSTYPE_TI_TEMPLATE (decl_type
)),
1465 return (DECL_NAME (decl
)
1466 == DECL_NAME (friend_decl
));
1472 /* Register the specialization SPEC as a specialization of TMPL with
1473 the indicated ARGS. IS_FRIEND indicates whether the specialization
1474 is actually just a friend declaration. Returns SPEC, or an
1475 equivalent prior declaration, if available.
1477 We also store instantiations of field packs in the hash table, even
1478 though they are not themselves templates, to make lookup easier. */
1481 register_specialization (tree spec
, tree tmpl
, tree args
, bool is_friend
,
1485 spec_entry
**slot
= NULL
;
1488 gcc_assert ((TREE_CODE (tmpl
) == TEMPLATE_DECL
&& DECL_P (spec
))
1489 || (TREE_CODE (tmpl
) == FIELD_DECL
1490 && TREE_CODE (spec
) == NONTYPE_ARGUMENT_PACK
));
1492 if (TREE_CODE (spec
) == FUNCTION_DECL
1493 && uses_template_parms (DECL_TI_ARGS (spec
)))
1494 /* This is the FUNCTION_DECL for a partial instantiation. Don't
1495 register it; we want the corresponding TEMPLATE_DECL instead.
1496 We use `uses_template_parms (DECL_TI_ARGS (spec))' rather than
1497 the more obvious `uses_template_parms (spec)' to avoid problems
1498 with default function arguments. In particular, given
1499 something like this:
1501 template <class T> void f(T t1, T t = T())
1503 the default argument expression is not substituted for in an
1504 instantiation unless and until it is actually needed. */
1507 if (optimize_specialization_lookup_p (tmpl
))
1508 /* We don't put these specializations in the hash table, but we might
1509 want to give an error about a mismatch. */
1510 fn
= retrieve_specialization (tmpl
, args
, 0);
1518 hash
= spec_hasher::hash (&elt
);
1521 decl_specializations
->find_slot_with_hash (&elt
, hash
, INSERT
);
1523 fn
= ((spec_entry
*) *slot
)->spec
;
1528 /* We can sometimes try to re-register a specialization that we've
1529 already got. In particular, regenerate_decl_from_template calls
1530 duplicate_decls which will update the specialization list. But,
1531 we'll still get called again here anyhow. It's more convenient
1532 to simply allow this than to try to prevent it. */
1535 else if (fn
&& DECL_TEMPLATE_SPECIALIZATION (spec
))
1537 if (DECL_TEMPLATE_INSTANTIATION (fn
))
1539 if (DECL_ODR_USED (fn
)
1540 || DECL_EXPLICIT_INSTANTIATION (fn
))
1542 error ("specialization of %qD after instantiation",
1544 return error_mark_node
;
1549 /* This situation should occur only if the first
1550 specialization is an implicit instantiation, the
1551 second is an explicit specialization, and the
1552 implicit instantiation has not yet been used. That
1553 situation can occur if we have implicitly
1554 instantiated a member function and then specialized
1557 We can also wind up here if a friend declaration that
1558 looked like an instantiation turns out to be a
1561 template <class T> void foo(T);
1562 class S { friend void foo<>(int) };
1563 template <> void foo(int);
1565 We transform the existing DECL in place so that any
1566 pointers to it become pointers to the updated
1569 If there was a definition for the template, but not
1570 for the specialization, we want this to look as if
1571 there were no definition, and vice versa. */
1572 DECL_INITIAL (fn
) = NULL_TREE
;
1573 duplicate_decls (spec
, fn
, is_friend
);
1574 /* The call to duplicate_decls will have applied
1577 An explicit specialization of a function template
1578 is inline only if it is explicitly declared to be,
1579 and independently of whether its function template
1582 to the primary function; now copy the inline bits to
1583 the various clones. */
1584 FOR_EACH_CLONE (clone
, fn
)
1586 DECL_DECLARED_INLINE_P (clone
)
1587 = DECL_DECLARED_INLINE_P (fn
);
1588 DECL_SOURCE_LOCATION (clone
)
1589 = DECL_SOURCE_LOCATION (fn
);
1590 DECL_DELETED_FN (clone
)
1591 = DECL_DELETED_FN (fn
);
1593 check_specialization_namespace (tmpl
);
1598 else if (DECL_TEMPLATE_SPECIALIZATION (fn
))
1600 tree dd
= duplicate_decls (spec
, fn
, is_friend
);
1601 if (dd
== error_mark_node
)
1602 /* We've already complained in duplicate_decls. */
1603 return error_mark_node
;
1605 if (dd
== NULL_TREE
&& DECL_INITIAL (spec
))
1606 /* Dup decl failed, but this is a new definition. Set the
1607 line number so any errors match this new
1609 DECL_SOURCE_LOCATION (fn
) = DECL_SOURCE_LOCATION (spec
);
1615 return duplicate_decls (spec
, fn
, is_friend
);
1617 /* A specialization must be declared in the same namespace as the
1618 template it is specializing. */
1619 if (DECL_P (spec
) && DECL_TEMPLATE_SPECIALIZATION (spec
)
1620 && !check_specialization_namespace (tmpl
))
1621 DECL_CONTEXT (spec
) = DECL_CONTEXT (tmpl
);
1623 if (slot
!= NULL
/* !optimize_specialization_lookup_p (tmpl) */)
1625 spec_entry
*entry
= ggc_alloc
<spec_entry
> ();
1626 gcc_assert (tmpl
&& args
&& spec
);
1629 if ((TREE_CODE (spec
) == FUNCTION_DECL
&& DECL_NAMESPACE_SCOPE_P (spec
)
1630 && PRIMARY_TEMPLATE_P (tmpl
)
1631 && DECL_SAVED_TREE (DECL_TEMPLATE_RESULT (tmpl
)) == NULL_TREE
)
1632 || variable_template_p (tmpl
))
1633 /* If TMPL is a forward declaration of a template function, keep a list
1634 of all specializations in case we need to reassign them to a friend
1635 template later in tsubst_friend_function.
1637 Also keep a list of all variable template instantiations so that
1638 process_partial_specialization can check whether a later partial
1639 specialization would have used it. */
1640 DECL_TEMPLATE_INSTANTIATIONS (tmpl
)
1641 = tree_cons (args
, spec
, DECL_TEMPLATE_INSTANTIATIONS (tmpl
));
1647 /* Returns true iff two spec_entry nodes are equivalent. */
1649 int comparing_specializations
;
1652 spec_hasher::equal (spec_entry
*e1
, spec_entry
*e2
)
1656 ++comparing_specializations
;
1657 equal
= (e1
->tmpl
== e2
->tmpl
1658 && comp_template_args (e1
->args
, e2
->args
));
1659 if (equal
&& flag_concepts
1660 /* tmpl could be a FIELD_DECL for a capture pack. */
1661 && TREE_CODE (e1
->tmpl
) == TEMPLATE_DECL
1662 && VAR_P (DECL_TEMPLATE_RESULT (e1
->tmpl
))
1663 && uses_template_parms (e1
->args
))
1665 /* Partial specializations of a variable template can be distinguished by
1667 tree c1
= e1
->spec
? get_constraints (e1
->spec
) : NULL_TREE
;
1668 tree c2
= e2
->spec
? get_constraints (e2
->spec
) : NULL_TREE
;
1669 equal
= equivalent_constraints (c1
, c2
);
1671 --comparing_specializations
;
1676 /* Returns a hash for a template TMPL and template arguments ARGS. */
1679 hash_tmpl_and_args (tree tmpl
, tree args
)
1681 hashval_t val
= iterative_hash_object (DECL_UID (tmpl
), 0);
1682 return iterative_hash_template_arg (args
, val
);
1685 /* Returns a hash for a spec_entry node based on the TMPL and ARGS members,
1689 spec_hasher::hash (spec_entry
*e
)
1691 return hash_tmpl_and_args (e
->tmpl
, e
->args
);
1694 /* Recursively calculate a hash value for a template argument ARG, for use
1695 in the hash tables of template specializations. */
1698 iterative_hash_template_arg (tree arg
, hashval_t val
)
1700 unsigned HOST_WIDE_INT i
;
1701 enum tree_code code
;
1704 if (arg
== NULL_TREE
)
1705 return iterative_hash_object (arg
, val
);
1710 if (TREE_CODE (arg
) == ARGUMENT_PACK_SELECT
)
1713 code
= TREE_CODE (arg
);
1714 tclass
= TREE_CODE_CLASS (code
);
1716 val
= iterative_hash_object (code
, val
);
1723 case IDENTIFIER_NODE
:
1724 return iterative_hash_object (IDENTIFIER_HASH_VALUE (arg
), val
);
1728 int i
, len
= TREE_VEC_LENGTH (arg
);
1729 for (i
= 0; i
< len
; ++i
)
1730 val
= iterative_hash_template_arg (TREE_VEC_ELT (arg
, i
), val
);
1734 case TYPE_PACK_EXPANSION
:
1735 case EXPR_PACK_EXPANSION
:
1736 val
= iterative_hash_template_arg (PACK_EXPANSION_PATTERN (arg
), val
);
1737 return iterative_hash_template_arg (PACK_EXPANSION_EXTRA_ARGS (arg
), val
);
1739 case TYPE_ARGUMENT_PACK
:
1740 case NONTYPE_ARGUMENT_PACK
:
1741 return iterative_hash_template_arg (ARGUMENT_PACK_ARGS (arg
), val
);
1744 for (; arg
; arg
= TREE_CHAIN (arg
))
1745 val
= iterative_hash_template_arg (TREE_VALUE (arg
), val
);
1749 for (lkp_iterator
iter (arg
); iter
; ++iter
)
1750 val
= iterative_hash_template_arg (*iter
, val
);
1756 iterative_hash_template_arg (TREE_TYPE (arg
), val
);
1757 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (arg
), i
, field
, value
)
1759 val
= iterative_hash_template_arg (field
, val
);
1760 val
= iterative_hash_template_arg (value
, val
);
1766 if (!DECL_ARTIFICIAL (arg
))
1768 val
= iterative_hash_object (DECL_PARM_INDEX (arg
), val
);
1769 val
= iterative_hash_object (DECL_PARM_LEVEL (arg
), val
);
1771 return iterative_hash_template_arg (TREE_TYPE (arg
), val
);
1774 return iterative_hash_template_arg (TARGET_EXPR_INITIAL (arg
), val
);
1777 val
= iterative_hash_template_arg (PTRMEM_CST_CLASS (arg
), val
);
1778 return iterative_hash_template_arg (PTRMEM_CST_MEMBER (arg
), val
);
1780 case TEMPLATE_PARM_INDEX
:
1781 val
= iterative_hash_template_arg
1782 (TREE_TYPE (TEMPLATE_PARM_DECL (arg
)), val
);
1783 val
= iterative_hash_object (TEMPLATE_PARM_LEVEL (arg
), val
);
1784 return iterative_hash_object (TEMPLATE_PARM_IDX (arg
), val
);
1787 val
= iterative_hash_object (TRAIT_EXPR_KIND (arg
), val
);
1788 val
= iterative_hash_template_arg (TRAIT_EXPR_TYPE1 (arg
), val
);
1789 return iterative_hash_template_arg (TRAIT_EXPR_TYPE2 (arg
), val
);
1792 val
= iterative_hash_template_arg (BINFO_TYPE (BASELINK_BINFO (arg
)),
1794 return iterative_hash_template_arg (DECL_NAME (get_first_fn (arg
)),
1798 val
= iterative_hash_template_arg (TREE_OPERAND (arg
, 0), val
);
1799 code
= TREE_CODE (TREE_OPERAND (arg
, 1));
1800 val
= iterative_hash_object (code
, val
);
1801 return iterative_hash_template_arg (TREE_OPERAND (arg
, 2), val
);
1804 /* A lambda can't appear in a template arg, but don't crash on
1806 gcc_assert (seen_error ());
1810 case IMPLICIT_CONV_EXPR
:
1811 case STATIC_CAST_EXPR
:
1812 case REINTERPRET_CAST_EXPR
:
1813 case CONST_CAST_EXPR
:
1814 case DYNAMIC_CAST_EXPR
:
1816 val
= iterative_hash_template_arg (TREE_TYPE (arg
), val
);
1817 /* Now hash operands as usual. */
1827 if (alias_template_specialization_p (arg
))
1829 // We want an alias specialization that survived strip_typedefs
1830 // to hash differently from its TYPE_CANONICAL, to avoid hash
1831 // collisions that compare as different in template_args_equal.
1832 // These could be dependent specializations that strip_typedefs
1833 // left alone, or untouched specializations because
1834 // coerce_template_parms returns the unconverted template
1835 // arguments if it sees incomplete argument packs.
1836 tree ti
= TYPE_ALIAS_TEMPLATE_INFO (arg
);
1837 return hash_tmpl_and_args (TI_TEMPLATE (ti
), TI_ARGS (ti
));
1839 if (TYPE_CANONICAL (arg
))
1840 return iterative_hash_object (TYPE_HASH (TYPE_CANONICAL (arg
)),
1842 else if (TREE_CODE (arg
) == DECLTYPE_TYPE
)
1843 return iterative_hash_template_arg (DECLTYPE_TYPE_EXPR (arg
), val
);
1844 /* Otherwise just compare the types during lookup. */
1847 case tcc_declaration
:
1849 return iterative_hash_expr (arg
, val
);
1852 gcc_assert (IS_EXPR_CODE_CLASS (tclass
));
1854 unsigned n
= cp_tree_operand_length (arg
);
1855 for (i
= 0; i
< n
; ++i
)
1856 val
= iterative_hash_template_arg (TREE_OPERAND (arg
, i
), val
);
1864 /* Unregister the specialization SPEC as a specialization of TMPL.
1865 Replace it with NEW_SPEC, if NEW_SPEC is non-NULL. Returns true
1866 if the SPEC was listed as a specialization of TMPL.
1868 Note that SPEC has been ggc_freed, so we can't look inside it. */
1871 reregister_specialization (tree spec
, tree tinfo
, tree new_spec
)
1876 elt
.tmpl
= most_general_template (TI_TEMPLATE (tinfo
));
1877 elt
.args
= TI_ARGS (tinfo
);
1878 elt
.spec
= NULL_TREE
;
1880 entry
= decl_specializations
->find (&elt
);
1883 gcc_assert (entry
->spec
== spec
|| entry
->spec
== new_spec
);
1884 gcc_assert (new_spec
!= NULL_TREE
);
1885 entry
->spec
= new_spec
;
1892 /* Like register_specialization, but for local declarations. We are
1893 registering SPEC, an instantiation of TMPL. */
1896 register_local_specialization (tree spec
, tree tmpl
)
1898 gcc_assert (tmpl
!= spec
);
1899 local_specializations
->put (tmpl
, spec
);
1902 /* TYPE is a class type. Returns true if TYPE is an explicitly
1903 specialized class. */
1906 explicit_class_specialization_p (tree type
)
1908 if (!CLASSTYPE_TEMPLATE_SPECIALIZATION (type
))
1910 return !uses_template_parms (CLASSTYPE_TI_ARGS (type
));
1913 /* Print the list of functions at FNS, going through all the overloads
1914 for each element of the list. Alternatively, FNS can not be a
1915 TREE_LIST, in which case it will be printed together with all the
1918 MORE and *STR should respectively be FALSE and NULL when the function
1919 is called from the outside. They are used internally on recursive
1920 calls. print_candidates manages the two parameters and leaves NULL
1921 in *STR when it ends. */
1924 print_candidates_1 (tree fns
, char **str
, bool more
= false)
1926 if (TREE_CODE (fns
) == TREE_LIST
)
1927 for (; fns
; fns
= TREE_CHAIN (fns
))
1928 print_candidates_1 (TREE_VALUE (fns
), str
, more
|| TREE_CHAIN (fns
));
1930 for (lkp_iterator
iter (fns
); iter
;)
1935 const char *pfx
= *str
;
1939 pfx
= _("candidates are:");
1941 pfx
= _("candidate is:");
1942 *str
= get_spaces (pfx
);
1944 inform (DECL_SOURCE_LOCATION (cand
), "%s %#qD", pfx
, cand
);
1948 /* Print the list of candidate FNS in an error message. FNS can also
1949 be a TREE_LIST of non-functions in the case of an ambiguous lookup. */
1952 print_candidates (tree fns
)
1955 print_candidates_1 (fns
, &str
);
1959 /* Get a (possibly) constrained template declaration for the
1960 purpose of ordering candidates. */
1962 get_template_for_ordering (tree list
)
1964 gcc_assert (TREE_CODE (list
) == TREE_LIST
);
1965 tree f
= TREE_VALUE (list
);
1966 if (tree ti
= DECL_TEMPLATE_INFO (f
))
1967 return TI_TEMPLATE (ti
);
1971 /* Among candidates having the same signature, return the
1972 most constrained or NULL_TREE if there is no best candidate.
1973 If the signatures of candidates vary (e.g., template
1974 specialization vs. member function), then there can be no
1977 Note that we don't compare constraints on the functions
1978 themselves, but rather those of their templates. */
1980 most_constrained_function (tree candidates
)
1982 // Try to find the best candidate in a first pass.
1983 tree champ
= candidates
;
1984 for (tree c
= TREE_CHAIN (champ
); c
; c
= TREE_CHAIN (c
))
1986 int winner
= more_constrained (get_template_for_ordering (champ
),
1987 get_template_for_ordering (c
));
1989 champ
= c
; // The candidate is more constrained
1990 else if (winner
== 0)
1991 return NULL_TREE
; // Neither is more constrained
1994 // Verify that the champ is better than previous candidates.
1995 for (tree c
= candidates
; c
!= champ
; c
= TREE_CHAIN (c
)) {
1996 if (!more_constrained (get_template_for_ordering (champ
),
1997 get_template_for_ordering (c
)))
2005 /* Returns the template (one of the functions given by TEMPLATE_ID)
2006 which can be specialized to match the indicated DECL with the
2007 explicit template args given in TEMPLATE_ID. The DECL may be
2008 NULL_TREE if none is available. In that case, the functions in
2009 TEMPLATE_ID are non-members.
2011 If NEED_MEMBER_TEMPLATE is nonzero the function is known to be a
2012 specialization of a member template.
2014 The TEMPLATE_COUNT is the number of references to qualifying
2015 template classes that appeared in the name of the function. See
2016 check_explicit_specialization for a more accurate description.
2018 TSK indicates what kind of template declaration (if any) is being
2019 declared. TSK_TEMPLATE indicates that the declaration given by
2020 DECL, though a FUNCTION_DECL, has template parameters, and is
2021 therefore a template function.
2023 The template args (those explicitly specified and those deduced)
2024 are output in a newly created vector *TARGS_OUT.
2026 If it is impossible to determine the result, an error message is
2027 issued. The error_mark_node is returned to indicate failure. */
2030 determine_specialization (tree template_id
,
2033 int need_member_template
,
2039 tree explicit_targs
;
2040 tree candidates
= NULL_TREE
;
2042 /* A TREE_LIST of templates of which DECL may be a specialization.
2043 The TREE_VALUE of each node is a TEMPLATE_DECL. The
2044 corresponding TREE_PURPOSE is the set of template arguments that,
2045 when used to instantiate the template, would produce a function
2046 with the signature of DECL. */
2047 tree templates
= NULL_TREE
;
2049 cp_binding_level
*b
;
2051 *targs_out
= NULL_TREE
;
2053 if (template_id
== error_mark_node
|| decl
== error_mark_node
)
2054 return error_mark_node
;
2056 /* We shouldn't be specializing a member template of an
2057 unspecialized class template; we already gave an error in
2058 check_specialization_scope, now avoid crashing. */
2059 if (template_count
&& DECL_CLASS_SCOPE_P (decl
)
2060 && template_class_depth (DECL_CONTEXT (decl
)) > 0)
2062 gcc_assert (errorcount
);
2063 return error_mark_node
;
2066 fns
= TREE_OPERAND (template_id
, 0);
2067 explicit_targs
= TREE_OPERAND (template_id
, 1);
2069 if (fns
== error_mark_node
)
2070 return error_mark_node
;
2072 /* Check for baselinks. */
2073 if (BASELINK_P (fns
))
2074 fns
= BASELINK_FUNCTIONS (fns
);
2076 if (TREE_CODE (decl
) == FUNCTION_DECL
&& !is_overloaded_fn (fns
))
2078 error ("%qD is not a function template", fns
);
2079 return error_mark_node
;
2081 else if (VAR_P (decl
) && !variable_template_p (fns
))
2083 error ("%qD is not a variable template", fns
);
2084 return error_mark_node
;
2087 /* Count the number of template headers specified for this
2090 for (b
= current_binding_level
;
2091 b
->kind
== sk_template_parms
;
2095 tree orig_fns
= fns
;
2097 if (variable_template_p (fns
))
2099 tree parms
= INNERMOST_TEMPLATE_PARMS (DECL_TEMPLATE_PARMS (fns
));
2100 targs
= coerce_template_parms (parms
, explicit_targs
, fns
,
2101 tf_warning_or_error
,
2102 /*req_all*/true, /*use_defarg*/true);
2103 if (targs
!= error_mark_node
)
2104 templates
= tree_cons (targs
, fns
, templates
);
2106 else for (lkp_iterator
iter (fns
); iter
; ++iter
)
2110 if (TREE_CODE (fn
) == TEMPLATE_DECL
)
2112 tree decl_arg_types
;
2116 /* In case of explicit specialization, we need to check if
2117 the number of template headers appearing in the specialization
2118 is correct. This is usually done in check_explicit_specialization,
2119 but the check done there cannot be exhaustive when specializing
2120 member functions. Consider the following code:
2122 template <> void A<int>::f(int);
2123 template <> template <> void A<int>::f(int);
2125 Assuming that A<int> is not itself an explicit specialization
2126 already, the first line specializes "f" which is a non-template
2127 member function, whilst the second line specializes "f" which
2128 is a template member function. So both lines are syntactically
2129 correct, and check_explicit_specialization does not reject
2132 Here, we can do better, as we are matching the specialization
2133 against the declarations. We count the number of template
2134 headers, and we check if they match TEMPLATE_COUNT + 1
2135 (TEMPLATE_COUNT is the number of qualifying template classes,
2136 plus there must be another header for the member template
2139 Notice that if header_count is zero, this is not a
2140 specialization but rather a template instantiation, so there
2141 is no check we can perform here. */
2142 if (header_count
&& header_count
!= template_count
+ 1)
2145 /* Check that the number of template arguments at the
2146 innermost level for DECL is the same as for FN. */
2147 if (current_binding_level
->kind
== sk_template_parms
2148 && !current_binding_level
->explicit_spec_p
2149 && (TREE_VEC_LENGTH (DECL_INNERMOST_TEMPLATE_PARMS (fn
))
2150 != TREE_VEC_LENGTH (INNERMOST_TEMPLATE_PARMS
2151 (current_template_parms
))))
2154 /* DECL might be a specialization of FN. */
2155 decl_arg_types
= TYPE_ARG_TYPES (TREE_TYPE (decl
));
2156 fn_arg_types
= TYPE_ARG_TYPES (TREE_TYPE (fn
));
2158 /* For a non-static member function, we need to make sure
2159 that the const qualification is the same. Since
2160 get_bindings does not try to merge the "this" parameter,
2161 we must do the comparison explicitly. */
2162 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fn
)
2163 && !same_type_p (TREE_VALUE (fn_arg_types
),
2164 TREE_VALUE (decl_arg_types
)))
2167 /* Skip the "this" parameter and, for constructors of
2168 classes with virtual bases, the VTT parameter. A
2169 full specialization of a constructor will have a VTT
2170 parameter, but a template never will. */
2172 = skip_artificial_parms_for (decl
, decl_arg_types
);
2174 = skip_artificial_parms_for (fn
, fn_arg_types
);
2176 /* Function templates cannot be specializations; there are
2177 no partial specializations of functions. Therefore, if
2178 the type of DECL does not match FN, there is no
2181 Note that it should never be the case that we have both
2182 candidates added here, and for regular member functions
2184 if (tsk
== tsk_template
)
2186 if (compparms (fn_arg_types
, decl_arg_types
))
2187 candidates
= tree_cons (NULL_TREE
, fn
, candidates
);
2191 /* See whether this function might be a specialization of this
2192 template. Suppress access control because we might be trying
2193 to make this specialization a friend, and we have already done
2194 access control for the declaration of the specialization. */
2195 push_deferring_access_checks (dk_no_check
);
2196 targs
= get_bindings (fn
, decl
, explicit_targs
, /*check_ret=*/true);
2197 pop_deferring_access_checks ();
2200 /* We cannot deduce template arguments that when used to
2201 specialize TMPL will produce DECL. */
2204 /* Remove, from the set of candidates, all those functions
2205 whose constraints are not satisfied. */
2206 if (flag_concepts
&& !constraints_satisfied_p (fn
, targs
))
2209 // Then, try to form the new function type.
2210 insttype
= tsubst (TREE_TYPE (fn
), targs
, tf_fndecl_type
, NULL_TREE
);
2211 if (insttype
== error_mark_node
)
2214 = skip_artificial_parms_for (fn
, TYPE_ARG_TYPES (insttype
));
2215 if (!compparms (fn_arg_types
, decl_arg_types
))
2218 /* Save this template, and the arguments deduced. */
2219 templates
= tree_cons (targs
, fn
, templates
);
2221 else if (need_member_template
)
2222 /* FN is an ordinary member function, and we need a
2223 specialization of a member template. */
2225 else if (TREE_CODE (fn
) != FUNCTION_DECL
)
2226 /* We can get IDENTIFIER_NODEs here in certain erroneous
2229 else if (!DECL_FUNCTION_MEMBER_P (fn
))
2230 /* This is just an ordinary non-member function. Nothing can
2231 be a specialization of that. */
2233 else if (DECL_ARTIFICIAL (fn
))
2234 /* Cannot specialize functions that are created implicitly. */
2238 tree decl_arg_types
;
2240 /* This is an ordinary member function. However, since
2241 we're here, we can assume its enclosing class is a
2242 template class. For example,
2244 template <typename T> struct S { void f(); };
2245 template <> void S<int>::f() {}
2247 Here, S<int>::f is a non-template, but S<int> is a
2248 template class. If FN has the same type as DECL, we
2249 might be in business. */
2251 if (!DECL_TEMPLATE_INFO (fn
))
2252 /* Its enclosing class is an explicit specialization
2253 of a template class. This is not a candidate. */
2256 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl
)),
2257 TREE_TYPE (TREE_TYPE (fn
))))
2258 /* The return types differ. */
2261 /* Adjust the type of DECL in case FN is a static member. */
2262 decl_arg_types
= TYPE_ARG_TYPES (TREE_TYPE (decl
));
2263 if (DECL_STATIC_FUNCTION_P (fn
)
2264 && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl
))
2265 decl_arg_types
= TREE_CHAIN (decl_arg_types
);
2267 if (!compparms (TYPE_ARG_TYPES (TREE_TYPE (fn
)),
2271 // If the deduced arguments do not satisfy the constraints,
2272 // this is not a candidate.
2273 if (flag_concepts
&& !constraints_satisfied_p (fn
))
2276 // Add the candidate.
2277 candidates
= tree_cons (NULL_TREE
, fn
, candidates
);
2281 if (templates
&& TREE_CHAIN (templates
))
2287 It is possible for a specialization with a given function
2288 signature to be instantiated from more than one function
2289 template. In such cases, explicit specification of the
2290 template arguments must be used to uniquely identify the
2291 function template specialization being specialized.
2293 Note that here, there's no suggestion that we're supposed to
2294 determine which of the candidate templates is most
2295 specialized. However, we, also have:
2299 Partial ordering of overloaded function template
2300 declarations is used in the following contexts to select
2301 the function template to which a function template
2302 specialization refers:
2304 -- when an explicit specialization refers to a function
2307 So, we do use the partial ordering rules, at least for now.
2308 This extension can only serve to make invalid programs valid,
2309 so it's safe. And, there is strong anecdotal evidence that
2310 the committee intended the partial ordering rules to apply;
2311 the EDG front end has that behavior, and John Spicer claims
2312 that the committee simply forgot to delete the wording in
2313 [temp.expl.spec]. */
2314 tree tmpl
= most_specialized_instantiation (templates
);
2315 if (tmpl
!= error_mark_node
)
2318 TREE_CHAIN (templates
) = NULL_TREE
;
2322 // Concepts allows multiple declarations of member functions
2323 // with the same signature. Like above, we need to rely on
2324 // on the partial ordering of those candidates to determine which
2326 if (flag_concepts
&& candidates
&& TREE_CHAIN (candidates
))
2328 if (tree cand
= most_constrained_function (candidates
))
2331 TREE_CHAIN (cand
) = NULL_TREE
;
2335 if (templates
== NULL_TREE
&& candidates
== NULL_TREE
)
2337 error ("template-id %qD for %q+D does not match any template "
2338 "declaration", template_id
, decl
);
2339 if (header_count
&& header_count
!= template_count
+ 1)
2340 inform (input_location
, "saw %d %<template<>%>, need %d for "
2341 "specializing a member function template",
2342 header_count
, template_count
+ 1);
2344 print_candidates (orig_fns
);
2345 return error_mark_node
;
2347 else if ((templates
&& TREE_CHAIN (templates
))
2348 || (candidates
&& TREE_CHAIN (candidates
))
2349 || (templates
&& candidates
))
2351 error ("ambiguous template specialization %qD for %q+D",
2353 candidates
= chainon (candidates
, templates
);
2354 print_candidates (candidates
);
2355 return error_mark_node
;
2358 /* We have one, and exactly one, match. */
2361 tree fn
= TREE_VALUE (candidates
);
2362 *targs_out
= copy_node (DECL_TI_ARGS (fn
));
2364 // Propagate the candidate's constraints to the declaration.
2365 set_constraints (decl
, get_constraints (fn
));
2367 /* DECL is a re-declaration or partial instantiation of a template
2369 if (TREE_CODE (fn
) == TEMPLATE_DECL
)
2371 /* It was a specialization of an ordinary member function in a
2373 return DECL_TI_TEMPLATE (fn
);
2376 /* It was a specialization of a template. */
2377 targs
= DECL_TI_ARGS (DECL_TEMPLATE_RESULT (TREE_VALUE (templates
)));
2378 if (TMPL_ARGS_HAVE_MULTIPLE_LEVELS (targs
))
2380 *targs_out
= copy_node (targs
);
2381 SET_TMPL_ARGS_LEVEL (*targs_out
,
2382 TMPL_ARGS_DEPTH (*targs_out
),
2383 TREE_PURPOSE (templates
));
2386 *targs_out
= TREE_PURPOSE (templates
);
2387 return TREE_VALUE (templates
);
2390 /* Returns a chain of parameter types, exactly like the SPEC_TYPES,
2391 but with the default argument values filled in from those in the
2395 copy_default_args_to_explicit_spec_1 (tree spec_types
,
2398 tree new_spec_types
;
2403 if (spec_types
== void_list_node
)
2404 return void_list_node
;
2406 /* Substitute into the rest of the list. */
2408 copy_default_args_to_explicit_spec_1 (TREE_CHAIN (spec_types
),
2409 TREE_CHAIN (tmpl_types
));
2411 /* Add the default argument for this parameter. */
2412 return hash_tree_cons (TREE_PURPOSE (tmpl_types
),
2413 TREE_VALUE (spec_types
),
2417 /* DECL is an explicit specialization. Replicate default arguments
2418 from the template it specializes. (That way, code like:
2420 template <class T> void f(T = 3);
2421 template <> void f(double);
2424 works, as required.) An alternative approach would be to look up
2425 the correct default arguments at the call-site, but this approach
2426 is consistent with how implicit instantiations are handled. */
2429 copy_default_args_to_explicit_spec (tree decl
)
2434 tree new_spec_types
;
2438 tree object_type
= NULL_TREE
;
2439 tree in_charge
= NULL_TREE
;
2440 tree vtt
= NULL_TREE
;
2442 /* See if there's anything we need to do. */
2443 tmpl
= DECL_TI_TEMPLATE (decl
);
2444 tmpl_types
= TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (tmpl
)));
2445 for (t
= tmpl_types
; t
; t
= TREE_CHAIN (t
))
2446 if (TREE_PURPOSE (t
))
2451 old_type
= TREE_TYPE (decl
);
2452 spec_types
= TYPE_ARG_TYPES (old_type
);
2454 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (decl
))
2456 /* Remove the this pointer, but remember the object's type for
2458 object_type
= TREE_TYPE (TREE_VALUE (spec_types
));
2459 spec_types
= TREE_CHAIN (spec_types
);
2460 tmpl_types
= TREE_CHAIN (tmpl_types
);
2462 if (DECL_HAS_IN_CHARGE_PARM_P (decl
))
2464 /* DECL may contain more parameters than TMPL due to the extra
2465 in-charge parameter in constructors and destructors. */
2466 in_charge
= spec_types
;
2467 spec_types
= TREE_CHAIN (spec_types
);
2469 if (DECL_HAS_VTT_PARM_P (decl
))
2472 spec_types
= TREE_CHAIN (spec_types
);
2476 /* Compute the merged default arguments. */
2478 copy_default_args_to_explicit_spec_1 (spec_types
, tmpl_types
);
2480 /* Compute the new FUNCTION_TYPE. */
2484 new_spec_types
= hash_tree_cons (TREE_PURPOSE (vtt
),
2489 /* Put the in-charge parameter back. */
2490 new_spec_types
= hash_tree_cons (TREE_PURPOSE (in_charge
),
2491 TREE_VALUE (in_charge
),
2494 new_type
= build_method_type_directly (object_type
,
2495 TREE_TYPE (old_type
),
2499 new_type
= build_function_type (TREE_TYPE (old_type
),
2501 new_type
= cp_build_type_attribute_variant (new_type
,
2502 TYPE_ATTRIBUTES (old_type
));
2503 new_type
= build_exception_variant (new_type
,
2504 TYPE_RAISES_EXCEPTIONS (old_type
));
2506 if (TYPE_HAS_LATE_RETURN_TYPE (old_type
))
2507 TYPE_HAS_LATE_RETURN_TYPE (new_type
) = 1;
2509 TREE_TYPE (decl
) = new_type
;
2512 /* Return the number of template headers we expect to see for a definition
2513 or specialization of CTYPE or one of its non-template members. */
2516 num_template_headers_for_class (tree ctype
)
2518 int num_templates
= 0;
2520 while (ctype
&& CLASS_TYPE_P (ctype
))
2522 /* You're supposed to have one `template <...>' for every
2523 template class, but you don't need one for a full
2524 specialization. For example:
2526 template <class T> struct S{};
2527 template <> struct S<int> { void f(); };
2528 void S<int>::f () {}
2530 is correct; there shouldn't be a `template <>' for the
2531 definition of `S<int>::f'. */
2532 if (!CLASSTYPE_TEMPLATE_INFO (ctype
))
2533 /* If CTYPE does not have template information of any
2534 kind, then it is not a template, nor is it nested
2535 within a template. */
2537 if (explicit_class_specialization_p (ctype
))
2539 if (PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (ctype
)))
2542 ctype
= TYPE_CONTEXT (ctype
);
2545 return num_templates
;
2548 /* Do a simple sanity check on the template headers that precede the
2549 variable declaration DECL. */
2552 check_template_variable (tree decl
)
2554 tree ctx
= CP_DECL_CONTEXT (decl
);
2555 int wanted
= num_template_headers_for_class (ctx
);
2556 if (DECL_LANG_SPECIFIC (decl
) && DECL_TEMPLATE_INFO (decl
)
2557 && PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl
)))
2559 if (cxx_dialect
< cxx14
)
2560 pedwarn (DECL_SOURCE_LOCATION (decl
), 0,
2561 "variable templates only available with "
2562 "-std=c++14 or -std=gnu++14");
2564 // Namespace-scope variable templates should have a template header.
2567 if (template_header_count
> wanted
)
2569 bool warned
= pedwarn (DECL_SOURCE_LOCATION (decl
), 0,
2570 "too many template headers for %qD "
2573 if (warned
&& CLASS_TYPE_P (ctx
)
2574 && CLASSTYPE_TEMPLATE_SPECIALIZATION (ctx
))
2575 inform (DECL_SOURCE_LOCATION (decl
),
2576 "members of an explicitly specialized class are defined "
2577 "without a template header");
2581 /* An explicit specialization whose declarator-id or class-head-name is not
2582 qualified shall be declared in the nearest enclosing namespace of the
2583 template, or, if the namespace is inline (7.3.1), any namespace from its
2584 enclosing namespace set.
2586 If the name declared in the explicit instantiation is an unqualified name,
2587 the explicit instantiation shall appear in the namespace where its template
2588 is declared or, if that namespace is inline (7.3.1), any namespace from its
2589 enclosing namespace set. */
2592 check_unqualified_spec_or_inst (tree t
, location_t loc
)
2594 tree tmpl
= most_general_template (t
);
2595 if (DECL_NAMESPACE_SCOPE_P (tmpl
)
2596 && !is_nested_namespace (current_namespace
,
2597 CP_DECL_CONTEXT (tmpl
), true))
2599 if (processing_specialization
)
2600 permerror (loc
, "explicit specialization of %qD outside its "
2601 "namespace must use a nested-name-specifier", tmpl
);
2602 else if (processing_explicit_instantiation
2603 && cxx_dialect
>= cxx11
)
2604 /* This was allowed in C++98, so only pedwarn. */
2605 pedwarn (loc
, OPT_Wpedantic
, "explicit instantiation of %qD "
2606 "outside its namespace must use a nested-name-"
2611 /* Check to see if the function just declared, as indicated in
2612 DECLARATOR, and in DECL, is a specialization of a function
2613 template. We may also discover that the declaration is an explicit
2614 instantiation at this point.
2616 Returns DECL, or an equivalent declaration that should be used
2617 instead if all goes well. Issues an error message if something is
2618 amiss. Returns error_mark_node if the error is not easily
2621 FLAGS is a bitmask consisting of the following flags:
2623 2: The function has a definition.
2624 4: The function is a friend.
2626 The TEMPLATE_COUNT is the number of references to qualifying
2627 template classes that appeared in the name of the function. For
2630 template <class T> struct S { void f(); };
2633 the TEMPLATE_COUNT would be 1. However, explicitly specialized
2634 classes are not counted in the TEMPLATE_COUNT, so that in
2636 template <class T> struct S {};
2637 template <> struct S<int> { void f(); }
2638 template <> void S<int>::f();
2640 the TEMPLATE_COUNT would be 0. (Note that this declaration is
2641 invalid; there should be no template <>.)
2643 If the function is a specialization, it is marked as such via
2644 DECL_TEMPLATE_SPECIALIZATION. Furthermore, its DECL_TEMPLATE_INFO
2645 is set up correctly, and it is added to the list of specializations
2646 for that template. */
2649 check_explicit_specialization (tree declarator
,
2654 int have_def
= flags
& 2;
2655 int is_friend
= flags
& 4;
2656 bool is_concept
= flags
& 8;
2657 int specialization
= 0;
2658 int explicit_instantiation
= 0;
2659 int member_specialization
= 0;
2660 tree ctype
= DECL_CLASS_CONTEXT (decl
);
2661 tree dname
= DECL_NAME (decl
);
2666 if (!processing_specialization
)
2669 tsk
= tsk_excessive_parms
;
2672 tsk
= current_tmpl_spec_kind (template_count
);
2677 if (processing_specialization
&& !VAR_P (decl
))
2680 SET_DECL_TEMPLATE_SPECIALIZATION (decl
);
2682 else if (TREE_CODE (declarator
) == TEMPLATE_ID_EXPR
)
2685 /* This could be something like:
2687 template <class T> void f(T);
2688 class S { friend void f<>(int); } */
2692 /* This case handles bogus declarations like template <>
2693 template <class T> void f<int>(); */
2695 error ("template-id %qD in declaration of primary template",
2702 case tsk_invalid_member_spec
:
2703 /* The error has already been reported in
2704 check_specialization_scope. */
2705 return error_mark_node
;
2707 case tsk_invalid_expl_inst
:
2708 error ("template parameter list used in explicit instantiation");
2714 error ("definition provided for explicit instantiation");
2716 explicit_instantiation
= 1;
2719 case tsk_excessive_parms
:
2720 case tsk_insufficient_parms
:
2721 if (tsk
== tsk_excessive_parms
)
2722 error ("too many template parameter lists in declaration of %qD",
2724 else if (template_header_count
)
2725 error("too few template parameter lists in declaration of %qD", decl
);
2727 error("explicit specialization of %qD must be introduced by "
2728 "%<template <>%>", decl
);
2733 error ("explicit specialization declared %<concept%>");
2735 if (VAR_P (decl
) && TREE_CODE (declarator
) != TEMPLATE_ID_EXPR
)
2736 /* In cases like template<> constexpr bool v = true;
2737 We'll give an error in check_template_variable. */
2740 SET_DECL_TEMPLATE_SPECIALIZATION (decl
);
2742 member_specialization
= 1;
2748 if (TREE_CODE (declarator
) == TEMPLATE_ID_EXPR
)
2750 /* This case handles bogus declarations like template <>
2751 template <class T> void f<int>(); */
2753 if (!uses_template_parms (declarator
))
2754 error ("template-id %qD in declaration of primary template",
2756 else if (variable_template_p (TREE_OPERAND (declarator
, 0)))
2758 /* Partial specialization of variable template. */
2759 SET_DECL_TEMPLATE_SPECIALIZATION (decl
);
2763 else if (cxx_dialect
< cxx14
)
2764 error ("non-type partial specialization %qD "
2765 "is not allowed", declarator
);
2767 error ("non-class, non-variable partial specialization %qD "
2768 "is not allowed", declarator
);
2773 if (ctype
&& CLASSTYPE_TEMPLATE_INSTANTIATION (ctype
))
2774 /* This is a specialization of a member template, without
2775 specialization the containing class. Something like:
2777 template <class T> struct S {
2778 template <class U> void f (U);
2780 template <> template <class U> void S<int>::f(U) {}
2782 That's a specialization -- but of the entire template. */
2790 if ((specialization
|| member_specialization
)
2791 /* This doesn't apply to variable templates. */
2792 && (TREE_CODE (TREE_TYPE (decl
)) == FUNCTION_TYPE
2793 || TREE_CODE (TREE_TYPE (decl
)) == METHOD_TYPE
))
2795 tree t
= TYPE_ARG_TYPES (TREE_TYPE (decl
));
2796 for (; t
; t
= TREE_CHAIN (t
))
2797 if (TREE_PURPOSE (t
))
2799 permerror (input_location
,
2800 "default argument specified in explicit specialization");
2805 if (specialization
|| member_specialization
|| explicit_instantiation
)
2807 tree tmpl
= NULL_TREE
;
2808 tree targs
= NULL_TREE
;
2809 bool was_template_id
= (TREE_CODE (declarator
) == TEMPLATE_ID_EXPR
);
2811 /* Make sure that the declarator is a TEMPLATE_ID_EXPR. */
2812 if (!was_template_id
)
2816 gcc_assert (identifier_p (declarator
));
2821 /* If there is no class context, the explicit instantiation
2822 must be at namespace scope. */
2823 gcc_assert (DECL_NAMESPACE_SCOPE_P (decl
));
2825 /* Find the namespace binding, using the declaration
2827 fns
= lookup_qualified_name (CP_DECL_CONTEXT (decl
), dname
,
2829 if (fns
== error_mark_node
)
2830 /* If lookup fails, look for a friend declaration so we can
2831 give a better diagnostic. */
2832 fns
= lookup_qualified_name (CP_DECL_CONTEXT (decl
), dname
,
2833 /*type*/false, /*complain*/true,
2836 if (fns
== error_mark_node
|| !is_overloaded_fn (fns
))
2838 error ("%qD is not a template function", dname
);
2839 fns
= error_mark_node
;
2843 declarator
= lookup_template_function (fns
, NULL_TREE
);
2846 if (declarator
== error_mark_node
)
2847 return error_mark_node
;
2849 if (ctype
!= NULL_TREE
&& TYPE_BEING_DEFINED (ctype
))
2851 if (!explicit_instantiation
)
2852 /* A specialization in class scope. This is invalid,
2853 but the error will already have been flagged by
2854 check_specialization_scope. */
2855 return error_mark_node
;
2858 /* It's not valid to write an explicit instantiation in
2861 class C { template void f(); }
2863 This case is caught by the parser. However, on
2866 template class C { void f(); };
2868 (which is invalid) we can get here. The error will be
2875 else if (ctype
!= NULL_TREE
2876 && (identifier_p (TREE_OPERAND (declarator
, 0))))
2878 // We'll match variable templates in start_decl.
2882 /* Find the list of functions in ctype that have the same
2883 name as the declared function. */
2884 tree name
= TREE_OPERAND (declarator
, 0);
2886 if (constructor_name_p (name
, ctype
))
2888 if (DECL_CONSTRUCTOR_P (decl
)
2889 ? !TYPE_HAS_USER_CONSTRUCTOR (ctype
)
2890 : !CLASSTYPE_DESTRUCTOR (ctype
))
2892 /* From [temp.expl.spec]:
2894 If such an explicit specialization for the member
2895 of a class template names an implicitly-declared
2896 special member function (clause _special_), the
2897 program is ill-formed.
2899 Similar language is found in [temp.explicit]. */
2900 error ("specialization of implicitly-declared special member function");
2901 return error_mark_node
;
2904 name
= DECL_NAME (decl
);
2907 /* For a type-conversion operator, We might be looking for
2908 `operator int' which will be a specialization of
2909 `operator T'. Grab all the conversion operators, and
2910 then select from them. */
2911 tree fns
= get_class_binding (ctype
, IDENTIFIER_CONV_OP_P (name
)
2912 ? conv_op_identifier
: name
);
2914 if (fns
== NULL_TREE
)
2916 error ("no member function %qD declared in %qT", name
, ctype
);
2917 return error_mark_node
;
2920 TREE_OPERAND (declarator
, 0) = fns
;
2923 /* Figure out what exactly is being specialized at this point.
2924 Note that for an explicit instantiation, even one for a
2925 member function, we cannot tell a priori whether the
2926 instantiation is for a member template, or just a member
2927 function of a template class. Even if a member template is
2928 being instantiated, the member template arguments may be
2929 elided if they can be deduced from the rest of the
2931 tmpl
= determine_specialization (declarator
, decl
,
2933 member_specialization
,
2937 if (!tmpl
|| tmpl
== error_mark_node
)
2938 /* We couldn't figure out what this declaration was
2940 return error_mark_node
;
2943 if (TREE_CODE (decl
) == FUNCTION_DECL
2944 && DECL_HIDDEN_FRIEND_P (tmpl
))
2946 if (pedwarn (DECL_SOURCE_LOCATION (decl
), 0,
2947 "friend declaration %qD is not visible to "
2948 "explicit specialization", tmpl
))
2949 inform (DECL_SOURCE_LOCATION (tmpl
),
2950 "friend declaration here");
2952 else if (!ctype
&& !is_friend
2953 && CP_DECL_CONTEXT (decl
) == current_namespace
)
2954 check_unqualified_spec_or_inst (tmpl
, DECL_SOURCE_LOCATION (decl
));
2956 tree gen_tmpl
= most_general_template (tmpl
);
2958 if (explicit_instantiation
)
2960 /* We don't set DECL_EXPLICIT_INSTANTIATION here; that
2961 is done by do_decl_instantiation later. */
2963 int arg_depth
= TMPL_ARGS_DEPTH (targs
);
2964 int parm_depth
= TMPL_PARMS_DEPTH (DECL_TEMPLATE_PARMS (tmpl
));
2966 if (arg_depth
> parm_depth
)
2968 /* If TMPL is not the most general template (for
2969 example, if TMPL is a friend template that is
2970 injected into namespace scope), then there will
2971 be too many levels of TARGS. Remove some of them
2976 new_targs
= make_tree_vec (parm_depth
);
2977 for (i
= arg_depth
- parm_depth
; i
< arg_depth
; ++i
)
2978 TREE_VEC_ELT (new_targs
, i
- (arg_depth
- parm_depth
))
2979 = TREE_VEC_ELT (targs
, i
);
2983 return instantiate_template (tmpl
, targs
, tf_error
);
2986 /* If we thought that the DECL was a member function, but it
2987 turns out to be specializing a static member function,
2988 make DECL a static member function as well. */
2989 if (DECL_FUNCTION_TEMPLATE_P (tmpl
)
2990 && DECL_STATIC_FUNCTION_P (tmpl
)
2991 && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl
))
2992 revert_static_member_fn (decl
);
2994 /* If this is a specialization of a member template of a
2995 template class, we want to return the TEMPLATE_DECL, not
2996 the specialization of it. */
2997 if (tsk
== tsk_template
&& !was_template_id
)
2999 tree result
= DECL_TEMPLATE_RESULT (tmpl
);
3000 SET_DECL_TEMPLATE_SPECIALIZATION (tmpl
);
3001 DECL_INITIAL (result
) = NULL_TREE
;
3005 DECL_SOURCE_LOCATION (tmpl
) = DECL_SOURCE_LOCATION (decl
);
3006 DECL_SOURCE_LOCATION (result
)
3007 = DECL_SOURCE_LOCATION (decl
);
3008 /* We want to use the argument list specified in the
3009 definition, not in the original declaration. */
3010 DECL_ARGUMENTS (result
) = DECL_ARGUMENTS (decl
);
3011 for (parm
= DECL_ARGUMENTS (result
); parm
;
3012 parm
= DECL_CHAIN (parm
))
3013 DECL_CONTEXT (parm
) = result
;
3015 return register_specialization (tmpl
, gen_tmpl
, targs
,
3019 /* Set up the DECL_TEMPLATE_INFO for DECL. */
3020 DECL_TEMPLATE_INFO (decl
) = build_template_info (tmpl
, targs
);
3022 if (was_template_id
)
3023 TINFO_USED_TEMPLATE_ID (DECL_TEMPLATE_INFO (decl
)) = true;
3025 /* Inherit default function arguments from the template
3026 DECL is specializing. */
3027 if (DECL_FUNCTION_TEMPLATE_P (tmpl
))
3028 copy_default_args_to_explicit_spec (decl
);
3030 /* This specialization has the same protection as the
3031 template it specializes. */
3032 TREE_PRIVATE (decl
) = TREE_PRIVATE (gen_tmpl
);
3033 TREE_PROTECTED (decl
) = TREE_PROTECTED (gen_tmpl
);
3035 /* 7.1.1-1 [dcl.stc]
3037 A storage-class-specifier shall not be specified in an
3038 explicit specialization...
3040 The parser rejects these, so unless action is taken here,
3041 explicit function specializations will always appear with
3044 The action recommended by the C++ CWG in response to C++
3045 defect report 605 is to make the storage class and linkage
3046 of the explicit specialization match the templated function:
3048 http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#605
3050 if (tsk
== tsk_expl_spec
&& DECL_FUNCTION_TEMPLATE_P (gen_tmpl
))
3052 tree tmpl_func
= DECL_TEMPLATE_RESULT (gen_tmpl
);
3053 gcc_assert (TREE_CODE (tmpl_func
) == FUNCTION_DECL
);
3055 /* A concept cannot be specialized. */
3056 if (DECL_DECLARED_CONCEPT_P (tmpl_func
))
3058 error ("explicit specialization of function concept %qD",
3060 return error_mark_node
;
3063 /* This specialization has the same linkage and visibility as
3064 the function template it specializes. */
3065 TREE_PUBLIC (decl
) = TREE_PUBLIC (tmpl_func
);
3066 if (! TREE_PUBLIC (decl
))
3068 DECL_INTERFACE_KNOWN (decl
) = 1;
3069 DECL_NOT_REALLY_EXTERN (decl
) = 1;
3071 DECL_THIS_STATIC (decl
) = DECL_THIS_STATIC (tmpl_func
);
3072 if (DECL_VISIBILITY_SPECIFIED (tmpl_func
))
3074 DECL_VISIBILITY_SPECIFIED (decl
) = 1;
3075 DECL_VISIBILITY (decl
) = DECL_VISIBILITY (tmpl_func
);
3079 /* If DECL is a friend declaration, declared using an
3080 unqualified name, the namespace associated with DECL may
3081 have been set incorrectly. For example, in:
3083 template <typename T> void f(T);
3085 struct S { friend void f<int>(int); }
3088 we will have set the DECL_CONTEXT for the friend
3089 declaration to N, rather than to the global namespace. */
3090 if (DECL_NAMESPACE_SCOPE_P (decl
))
3091 DECL_CONTEXT (decl
) = DECL_CONTEXT (tmpl
);
3093 if (is_friend
&& !have_def
)
3094 /* This is not really a declaration of a specialization.
3095 It's just the name of an instantiation. But, it's not
3096 a request for an instantiation, either. */
3097 SET_DECL_IMPLICIT_INSTANTIATION (decl
);
3098 else if (TREE_CODE (decl
) == FUNCTION_DECL
)
3099 /* A specialization is not necessarily COMDAT. */
3100 DECL_COMDAT (decl
) = (TREE_PUBLIC (decl
)
3101 && DECL_DECLARED_INLINE_P (decl
));
3102 else if (VAR_P (decl
))
3103 DECL_COMDAT (decl
) = false;
3105 /* If this is a full specialization, register it so that we can find
3106 it again. Partial specializations will be registered in
3107 process_partial_specialization. */
3108 if (!processing_template_decl
)
3109 decl
= register_specialization (decl
, gen_tmpl
, targs
,
3112 /* A 'structor should already have clones. */
3113 gcc_assert (decl
== error_mark_node
3114 || variable_template_p (tmpl
)
3115 || !(DECL_CONSTRUCTOR_P (decl
)
3116 || DECL_DESTRUCTOR_P (decl
))
3117 || DECL_CLONED_FUNCTION_P (DECL_CHAIN (decl
)));
3124 /* Returns 1 iff PARMS1 and PARMS2 are identical sets of template
3125 parameters. These are represented in the same format used for
3126 DECL_TEMPLATE_PARMS. */
3129 comp_template_parms (const_tree parms1
, const_tree parms2
)
3134 if (parms1
== parms2
)
3137 for (p1
= parms1
, p2
= parms2
;
3138 p1
!= NULL_TREE
&& p2
!= NULL_TREE
;
3139 p1
= TREE_CHAIN (p1
), p2
= TREE_CHAIN (p2
))
3141 tree t1
= TREE_VALUE (p1
);
3142 tree t2
= TREE_VALUE (p2
);
3145 gcc_assert (TREE_CODE (t1
) == TREE_VEC
);
3146 gcc_assert (TREE_CODE (t2
) == TREE_VEC
);
3148 if (TREE_VEC_LENGTH (t1
) != TREE_VEC_LENGTH (t2
))
3151 for (i
= 0; i
< TREE_VEC_LENGTH (t2
); ++i
)
3153 tree parm1
= TREE_VALUE (TREE_VEC_ELT (t1
, i
));
3154 tree parm2
= TREE_VALUE (TREE_VEC_ELT (t2
, i
));
3156 /* If either of the template parameters are invalid, assume
3157 they match for the sake of error recovery. */
3158 if (error_operand_p (parm1
) || error_operand_p (parm2
))
3161 if (TREE_CODE (parm1
) != TREE_CODE (parm2
))
3164 if (TREE_CODE (parm1
) == TEMPLATE_TYPE_PARM
3165 && (TEMPLATE_TYPE_PARAMETER_PACK (parm1
)
3166 == TEMPLATE_TYPE_PARAMETER_PACK (parm2
)))
3168 else if (!same_type_p (TREE_TYPE (parm1
), TREE_TYPE (parm2
)))
3173 if ((p1
!= NULL_TREE
) != (p2
!= NULL_TREE
))
3174 /* One set of parameters has more parameters lists than the
3181 /* Determine whether PARM is a parameter pack. */
3184 template_parameter_pack_p (const_tree parm
)
3186 /* Determine if we have a non-type template parameter pack. */
3187 if (TREE_CODE (parm
) == PARM_DECL
)
3188 return (DECL_TEMPLATE_PARM_P (parm
)
3189 && TEMPLATE_PARM_PARAMETER_PACK (DECL_INITIAL (parm
)));
3190 if (TREE_CODE (parm
) == TEMPLATE_PARM_INDEX
)
3191 return TEMPLATE_PARM_PARAMETER_PACK (parm
);
3193 /* If this is a list of template parameters, we could get a
3194 TYPE_DECL or a TEMPLATE_DECL. */
3195 if (TREE_CODE (parm
) == TYPE_DECL
|| TREE_CODE (parm
) == TEMPLATE_DECL
)
3196 parm
= TREE_TYPE (parm
);
3198 /* Otherwise it must be a type template parameter. */
3199 return ((TREE_CODE (parm
) == TEMPLATE_TYPE_PARM
3200 || TREE_CODE (parm
) == TEMPLATE_TEMPLATE_PARM
)
3201 && TEMPLATE_TYPE_PARAMETER_PACK (parm
));
3204 /* Determine if T is a function parameter pack. */
3207 function_parameter_pack_p (const_tree t
)
3209 if (t
&& TREE_CODE (t
) == PARM_DECL
)
3210 return DECL_PACK_P (t
);
3214 /* Return the function template declaration of PRIMARY_FUNC_TMPL_INST.
3215 PRIMARY_FUNC_TMPL_INST is a primary function template instantiation. */
3218 get_function_template_decl (const_tree primary_func_tmpl_inst
)
3220 if (! primary_func_tmpl_inst
3221 || TREE_CODE (primary_func_tmpl_inst
) != FUNCTION_DECL
3222 || ! primary_template_specialization_p (primary_func_tmpl_inst
))
3225 return DECL_TEMPLATE_RESULT (DECL_TI_TEMPLATE (primary_func_tmpl_inst
));
3228 /* Return true iff the function parameter PARAM_DECL was expanded
3229 from the function parameter pack PACK. */
3232 function_parameter_expanded_from_pack_p (tree param_decl
, tree pack
)
3234 if (DECL_ARTIFICIAL (param_decl
)
3235 || !function_parameter_pack_p (pack
))
3238 /* The parameter pack and its pack arguments have the same
3240 return DECL_PARM_INDEX (pack
) == DECL_PARM_INDEX (param_decl
);
3243 /* Determine whether ARGS describes a variadic template args list,
3244 i.e., one that is terminated by a template argument pack. */
3247 template_args_variadic_p (tree args
)
3252 if (args
== NULL_TREE
)
3255 args
= INNERMOST_TEMPLATE_ARGS (args
);
3256 nargs
= TREE_VEC_LENGTH (args
);
3261 last_parm
= TREE_VEC_ELT (args
, nargs
- 1);
3263 return ARGUMENT_PACK_P (last_parm
);
3266 /* Generate a new name for the parameter pack name NAME (an
3267 IDENTIFIER_NODE) that incorporates its */
3270 make_ith_pack_parameter_name (tree name
, int i
)
3272 /* Munge the name to include the parameter index. */
3273 #define NUMBUF_LEN 128
3274 char numbuf
[NUMBUF_LEN
];
3278 if (name
== NULL_TREE
)
3280 snprintf (numbuf
, NUMBUF_LEN
, "%i", i
);
3281 newname_len
= IDENTIFIER_LENGTH (name
)
3282 + strlen (numbuf
) + 2;
3283 newname
= (char*)alloca (newname_len
);
3284 snprintf (newname
, newname_len
,
3285 "%s#%i", IDENTIFIER_POINTER (name
), i
);
3286 return get_identifier (newname
);
3289 /* Return true if T is a primary function, class or alias template
3290 specialization, not including the template pattern. */
3293 primary_template_specialization_p (const_tree t
)
3298 if (TREE_CODE (t
) == FUNCTION_DECL
|| VAR_P (t
))
3299 return (DECL_LANG_SPECIFIC (t
)
3300 && DECL_USE_TEMPLATE (t
)
3301 && DECL_TEMPLATE_INFO (t
)
3302 && PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (t
)));
3303 else if (CLASS_TYPE_P (t
) && !TYPE_DECL_ALIAS_P (TYPE_NAME (t
)))
3304 return (CLASSTYPE_TEMPLATE_INFO (t
)
3305 && CLASSTYPE_USE_TEMPLATE (t
)
3306 && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (t
)));
3307 else if (alias_template_specialization_p (t
))
3312 /* Return true if PARM is a template template parameter. */
3315 template_template_parameter_p (const_tree parm
)
3317 return DECL_TEMPLATE_TEMPLATE_PARM_P (parm
);
3320 /* Return true iff PARM is a DECL representing a type template
3324 template_type_parameter_p (const_tree parm
)
3327 && (TREE_CODE (parm
) == TYPE_DECL
3328 || TREE_CODE (parm
) == TEMPLATE_DECL
)
3329 && DECL_TEMPLATE_PARM_P (parm
));
3332 /* Return the template parameters of T if T is a
3333 primary template instantiation, NULL otherwise. */
3336 get_primary_template_innermost_parameters (const_tree t
)
3338 tree parms
= NULL
, template_info
= NULL
;
3340 if ((template_info
= get_template_info (t
))
3341 && primary_template_specialization_p (t
))
3342 parms
= INNERMOST_TEMPLATE_PARMS
3343 (DECL_TEMPLATE_PARMS (TI_TEMPLATE (template_info
)));
3348 /* Return the template parameters of the LEVELth level from the full list
3349 of template parameters PARMS. */
3352 get_template_parms_at_level (tree parms
, int level
)
3356 || TREE_CODE (parms
) != TREE_LIST
3357 || level
> TMPL_PARMS_DEPTH (parms
))
3360 for (p
= parms
; p
; p
= TREE_CHAIN (p
))
3361 if (TMPL_PARMS_DEPTH (p
) == level
)
3367 /* Returns the template arguments of T if T is a template instantiation,
3371 get_template_innermost_arguments (const_tree t
)
3373 tree args
= NULL
, template_info
= NULL
;
3375 if ((template_info
= get_template_info (t
))
3376 && TI_ARGS (template_info
))
3377 args
= INNERMOST_TEMPLATE_ARGS (TI_ARGS (template_info
));
3382 /* Return the argument pack elements of T if T is a template argument pack,
3386 get_template_argument_pack_elems (const_tree t
)
3388 if (TREE_CODE (t
) != TYPE_ARGUMENT_PACK
3389 && TREE_CODE (t
) != NONTYPE_ARGUMENT_PACK
)
3392 return ARGUMENT_PACK_ARGS (t
);
3395 /* True iff FN is a function representing a built-in variadic parameter
3399 builtin_pack_fn_p (tree fn
)
3402 || TREE_CODE (fn
) != FUNCTION_DECL
3403 || !DECL_IS_BUILTIN (fn
))
3406 if (id_equal (DECL_NAME (fn
), "__integer_pack"))
3412 /* True iff CALL is a call to a function representing a built-in variadic
3416 builtin_pack_call_p (tree call
)
3418 if (TREE_CODE (call
) != CALL_EXPR
)
3420 return builtin_pack_fn_p (CALL_EXPR_FN (call
));
3423 /* Return a TREE_VEC for the expansion of __integer_pack(HI). */
3426 expand_integer_pack (tree call
, tree args
, tsubst_flags_t complain
,
3429 tree ohi
= CALL_EXPR_ARG (call
, 0);
3430 tree hi
= tsubst_copy_and_build (ohi
, args
, complain
, in_decl
,
3431 false/*fn*/, true/*int_cst*/);
3433 if (value_dependent_expression_p (hi
))
3437 call
= copy_node (call
);
3438 CALL_EXPR_ARG (call
, 0) = hi
;
3440 tree ex
= make_pack_expansion (call
, complain
);
3441 tree vec
= make_tree_vec (1);
3442 TREE_VEC_ELT (vec
, 0) = ex
;
3447 hi
= cxx_constant_value (hi
);
3448 int len
= valid_constant_size_p (hi
) ? tree_to_shwi (hi
) : -1;
3450 /* Calculate the largest value of len that won't make the size of the vec
3451 overflow an int. The compiler will exceed resource limits long before
3452 this, but it seems a decent place to diagnose. */
3453 int max
= ((INT_MAX
- sizeof (tree_vec
)) / sizeof (tree
)) + 1;
3455 if (len
< 0 || len
> max
)
3457 if ((complain
& tf_error
)
3458 && hi
!= error_mark_node
)
3459 error ("argument to __integer_pack must be between 0 and %d", max
);
3460 return error_mark_node
;
3463 tree vec
= make_tree_vec (len
);
3465 for (int i
= 0; i
< len
; ++i
)
3466 TREE_VEC_ELT (vec
, i
) = size_int (i
);
3472 /* Return a TREE_VEC for the expansion of built-in template parameter pack
3476 expand_builtin_pack_call (tree call
, tree args
, tsubst_flags_t complain
,
3479 if (!builtin_pack_call_p (call
))
3482 tree fn
= CALL_EXPR_FN (call
);
3484 if (id_equal (DECL_NAME (fn
), "__integer_pack"))
3485 return expand_integer_pack (call
, args
, complain
, in_decl
);
3490 /* Structure used to track the progress of find_parameter_packs_r. */
3491 struct find_parameter_pack_data
3493 /* TREE_LIST that will contain all of the parameter packs found by
3495 tree
* parameter_packs
;
3497 /* Set of AST nodes that have been visited by the traversal. */
3498 hash_set
<tree
> *visited
;
3500 /* True iff we're making a type pack expansion. */
3501 bool type_pack_expansion_p
;
3504 /* Identifies all of the argument packs that occur in a template
3505 argument and appends them to the TREE_LIST inside DATA, which is a
3506 find_parameter_pack_data structure. This is a subroutine of
3507 make_pack_expansion and uses_parameter_packs. */
3509 find_parameter_packs_r (tree
*tp
, int *walk_subtrees
, void* data
)
3512 struct find_parameter_pack_data
* ppd
=
3513 (struct find_parameter_pack_data
*)data
;
3514 bool parameter_pack_p
= false;
3516 /* Handle type aliases/typedefs. */
3517 if (TYPE_ALIAS_P (t
))
3519 if (tree tinfo
= TYPE_ALIAS_TEMPLATE_INFO (t
))
3520 cp_walk_tree (&TI_ARGS (tinfo
),
3521 &find_parameter_packs_r
,
3527 /* Identify whether this is a parameter pack or not. */
3528 switch (TREE_CODE (t
))
3530 case TEMPLATE_PARM_INDEX
:
3531 if (TEMPLATE_PARM_PARAMETER_PACK (t
))
3532 parameter_pack_p
= true;
3535 case TEMPLATE_TYPE_PARM
:
3536 t
= TYPE_MAIN_VARIANT (t
);
3538 case TEMPLATE_TEMPLATE_PARM
:
3539 /* If the placeholder appears in the decl-specifier-seq of a function
3540 parameter pack (14.6.3), or the type-specifier-seq of a type-id that
3541 is a pack expansion, the invented template parameter is a template
3543 if (ppd
->type_pack_expansion_p
&& is_auto (t
))
3544 TEMPLATE_TYPE_PARAMETER_PACK (t
) = true;
3545 if (TEMPLATE_TYPE_PARAMETER_PACK (t
))
3546 parameter_pack_p
= true;
3551 if (DECL_PACK_P (t
))
3553 /* We don't want to walk into the type of a PARM_DECL,
3554 because we don't want to see the type parameter pack. */
3556 parameter_pack_p
= true;
3560 /* Look through a lambda capture proxy to the field pack. */
3562 if (DECL_HAS_VALUE_EXPR_P (t
))
3564 tree v
= DECL_VALUE_EXPR (t
);
3566 &find_parameter_packs_r
,
3570 else if (variable_template_specialization_p (t
))
3572 cp_walk_tree (&DECL_TI_ARGS (t
),
3573 find_parameter_packs_r
,
3580 if (builtin_pack_call_p (t
))
3581 parameter_pack_p
= true;
3585 parameter_pack_p
= true;
3588 /* Not a parameter pack. */
3592 if (parameter_pack_p
)
3594 /* Add this parameter pack to the list. */
3595 *ppd
->parameter_packs
= tree_cons (NULL_TREE
, t
, *ppd
->parameter_packs
);
3599 cp_walk_tree (&TYPE_CONTEXT (t
),
3600 &find_parameter_packs_r
, ppd
, ppd
->visited
);
3602 /* This switch statement will return immediately if we don't find a
3604 switch (TREE_CODE (t
))
3606 case TEMPLATE_PARM_INDEX
:
3609 case BOUND_TEMPLATE_TEMPLATE_PARM
:
3610 /* Check the template itself. */
3611 cp_walk_tree (&TREE_TYPE (TYPE_TI_TEMPLATE (t
)),
3612 &find_parameter_packs_r
, ppd
, ppd
->visited
);
3613 /* Check the template arguments. */
3614 cp_walk_tree (&TYPE_TI_ARGS (t
), &find_parameter_packs_r
, ppd
,
3619 case TEMPLATE_TYPE_PARM
:
3620 case TEMPLATE_TEMPLATE_PARM
:
3627 /* Ignore the declaration of a capture proxy for a parameter pack. */
3628 if (is_capture_proxy (DECL_EXPR_DECL (t
)))
3633 if (TYPE_PTRMEMFUNC_P (t
))
3639 if (TYPE_TEMPLATE_INFO (t
))
3640 cp_walk_tree (&TYPE_TI_ARGS (t
),
3641 &find_parameter_packs_r
, ppd
, ppd
->visited
);
3647 if (!DECL_TEMPLATE_TEMPLATE_PARM_P (t
))
3652 cp_walk_tree (&TREE_TYPE (t
),
3653 &find_parameter_packs_r
, ppd
, ppd
->visited
);
3657 cp_walk_tree (&TYPENAME_TYPE_FULLNAME (t
), &find_parameter_packs_r
,
3662 case TYPE_PACK_EXPANSION
:
3663 case EXPR_PACK_EXPANSION
:
3668 cp_walk_tree (&TYPE_MAX_VALUE (t
), &find_parameter_packs_r
,
3673 case IDENTIFIER_NODE
:
3674 cp_walk_tree (&TREE_TYPE (t
), &find_parameter_packs_r
, ppd
,
3681 tree fn
= lambda_function (t
);
3682 cp_walk_tree (&DECL_SAVED_TREE (fn
), &find_parameter_packs_r
, ppd
,
3690 /* When traversing a DECLTYPE_TYPE_EXPR, we need to set
3691 type_pack_expansion_p to false so that any placeholders
3692 within the expression don't get marked as parameter packs. */
3693 bool type_pack_expansion_p
= ppd
->type_pack_expansion_p
;
3694 ppd
->type_pack_expansion_p
= false;
3695 cp_walk_tree (&DECLTYPE_TYPE_EXPR (t
), &find_parameter_packs_r
,
3697 ppd
->type_pack_expansion_p
= type_pack_expansion_p
;
3709 /* Determines if the expression or type T uses any parameter packs. */
3711 uses_parameter_packs (tree t
)
3713 tree parameter_packs
= NULL_TREE
;
3714 struct find_parameter_pack_data ppd
;
3715 ppd
.parameter_packs
= ¶meter_packs
;
3716 ppd
.visited
= new hash_set
<tree
>;
3717 ppd
.type_pack_expansion_p
= false;
3718 cp_walk_tree (&t
, &find_parameter_packs_r
, &ppd
, ppd
.visited
);
3720 return parameter_packs
!= NULL_TREE
;
3723 /* Turn ARG, which may be an expression, type, or a TREE_LIST
3724 representation a base-class initializer into a parameter pack
3725 expansion. If all goes well, the resulting node will be an
3726 EXPR_PACK_EXPANSION, TYPE_PACK_EXPANSION, or TREE_LIST,
3729 make_pack_expansion (tree arg
, tsubst_flags_t complain
)
3732 tree parameter_packs
= NULL_TREE
;
3733 bool for_types
= false;
3734 struct find_parameter_pack_data ppd
;
3736 if (!arg
|| arg
== error_mark_node
)
3739 if (TREE_CODE (arg
) == TREE_LIST
&& TREE_PURPOSE (arg
))
3741 /* A TREE_LIST with a non-null TREE_PURPOSE is for a base
3742 class initializer. In this case, the TREE_PURPOSE will be a
3743 _TYPE node (representing the base class expansion we're
3744 initializing) and the TREE_VALUE will be a TREE_LIST
3745 containing the initialization arguments.
3747 The resulting expansion looks somewhat different from most
3748 expansions. Rather than returning just one _EXPANSION, we
3749 return a TREE_LIST whose TREE_PURPOSE is a
3750 TYPE_PACK_EXPANSION containing the bases that will be
3751 initialized. The TREE_VALUE will be identical to the
3752 original TREE_VALUE, which is a list of arguments that will
3753 be passed to each base. We do not introduce any new pack
3754 expansion nodes into the TREE_VALUE (although it is possible
3755 that some already exist), because the TREE_PURPOSE and
3756 TREE_VALUE all need to be expanded together with the same
3757 _EXPANSION node. Note that the TYPE_PACK_EXPANSION in the
3758 resulting TREE_PURPOSE will mention the parameter packs in
3759 both the bases and the arguments to the bases. */
3762 tree parameter_packs
= NULL_TREE
;
3764 /* Determine which parameter packs will be used by the base
3766 ppd
.visited
= new hash_set
<tree
>;
3767 ppd
.parameter_packs
= ¶meter_packs
;
3768 ppd
.type_pack_expansion_p
= true;
3769 gcc_assert (TYPE_P (TREE_PURPOSE (arg
)));
3770 cp_walk_tree (&TREE_PURPOSE (arg
), &find_parameter_packs_r
,
3773 if (parameter_packs
== NULL_TREE
)
3775 if (complain
& tf_error
)
3776 error ("base initializer expansion %qT contains no parameter packs",
3779 return error_mark_node
;
3782 if (TREE_VALUE (arg
) != void_type_node
)
3784 /* Collect the sets of parameter packs used in each of the
3785 initialization arguments. */
3786 for (value
= TREE_VALUE (arg
); value
; value
= TREE_CHAIN (value
))
3788 /* Determine which parameter packs will be expanded in this
3790 cp_walk_tree (&TREE_VALUE (value
), &find_parameter_packs_r
,
3797 /* Create the pack expansion type for the base type. */
3798 purpose
= cxx_make_type (TYPE_PACK_EXPANSION
);
3799 SET_PACK_EXPANSION_PATTERN (purpose
, TREE_PURPOSE (arg
));
3800 PACK_EXPANSION_PARAMETER_PACKS (purpose
) = parameter_packs
;
3801 PACK_EXPANSION_LOCAL_P (purpose
) = at_function_scope_p ();
3803 /* Just use structural equality for these TYPE_PACK_EXPANSIONS;
3804 they will rarely be compared to anything. */
3805 SET_TYPE_STRUCTURAL_EQUALITY (purpose
);
3807 return tree_cons (purpose
, TREE_VALUE (arg
), NULL_TREE
);
3810 if (TYPE_P (arg
) || TREE_CODE (arg
) == TEMPLATE_DECL
)
3813 /* Build the PACK_EXPANSION_* node. */
3815 ? cxx_make_type (TYPE_PACK_EXPANSION
)
3816 : make_node (EXPR_PACK_EXPANSION
);
3817 SET_PACK_EXPANSION_PATTERN (result
, arg
);
3818 if (TREE_CODE (result
) == EXPR_PACK_EXPANSION
)
3820 /* Propagate type and const-expression information. */
3821 TREE_TYPE (result
) = TREE_TYPE (arg
);
3822 TREE_CONSTANT (result
) = TREE_CONSTANT (arg
);
3823 /* Mark this read now, since the expansion might be length 0. */
3824 mark_exp_read (arg
);
3827 /* Just use structural equality for these TYPE_PACK_EXPANSIONS;
3828 they will rarely be compared to anything. */
3829 SET_TYPE_STRUCTURAL_EQUALITY (result
);
3831 /* Determine which parameter packs will be expanded. */
3832 ppd
.parameter_packs
= ¶meter_packs
;
3833 ppd
.visited
= new hash_set
<tree
>;
3834 ppd
.type_pack_expansion_p
= TYPE_P (arg
);
3835 cp_walk_tree (&arg
, &find_parameter_packs_r
, &ppd
, ppd
.visited
);
3838 /* Make sure we found some parameter packs. */
3839 if (parameter_packs
== NULL_TREE
)
3841 if (complain
& tf_error
)
3844 error ("expansion pattern %qT contains no argument packs", arg
);
3846 error ("expansion pattern %qE contains no argument packs", arg
);
3848 return error_mark_node
;
3850 PACK_EXPANSION_PARAMETER_PACKS (result
) = parameter_packs
;
3852 PACK_EXPANSION_LOCAL_P (result
) = at_function_scope_p ();
3857 /* Checks T for any "bare" parameter packs, which have not yet been
3858 expanded, and issues an error if any are found. This operation can
3859 only be done on full expressions or types (e.g., an expression
3860 statement, "if" condition, etc.), because we could have expressions like:
3862 foo(f(g(h(args)))...)
3864 where "args" is a parameter pack. check_for_bare_parameter_packs
3865 should not be called for the subexpressions args, h(args),
3866 g(h(args)), or f(g(h(args))), because we would produce erroneous
3869 Returns TRUE and emits an error if there were bare parameter packs,
3870 returns FALSE otherwise. */
3872 check_for_bare_parameter_packs (tree t
)
3874 tree parameter_packs
= NULL_TREE
;
3875 struct find_parameter_pack_data ppd
;
3877 if (!processing_template_decl
|| !t
|| t
== error_mark_node
)
3880 /* A lambda might use a parameter pack from the containing context. */
3881 if (current_function_decl
&& LAMBDA_FUNCTION_P (current_function_decl
))
3884 if (TREE_CODE (t
) == TYPE_DECL
)
3887 ppd
.parameter_packs
= ¶meter_packs
;
3888 ppd
.visited
= new hash_set
<tree
>;
3889 ppd
.type_pack_expansion_p
= false;
3890 cp_walk_tree (&t
, &find_parameter_packs_r
, &ppd
, ppd
.visited
);
3893 if (parameter_packs
)
3895 location_t loc
= EXPR_LOC_OR_LOC (t
, input_location
);
3896 error_at (loc
, "parameter packs not expanded with %<...%>:");
3897 while (parameter_packs
)
3899 tree pack
= TREE_VALUE (parameter_packs
);
3900 tree name
= NULL_TREE
;
3902 if (TREE_CODE (pack
) == TEMPLATE_TYPE_PARM
3903 || TREE_CODE (pack
) == TEMPLATE_TEMPLATE_PARM
)
3904 name
= TYPE_NAME (pack
);
3905 else if (TREE_CODE (pack
) == TEMPLATE_PARM_INDEX
)
3906 name
= DECL_NAME (TEMPLATE_PARM_DECL (pack
));
3907 else if (TREE_CODE (pack
) == CALL_EXPR
)
3908 name
= DECL_NAME (CALL_EXPR_FN (pack
));
3910 name
= DECL_NAME (pack
);
3913 inform (loc
, " %qD", name
);
3915 inform (loc
, " <anonymous>");
3917 parameter_packs
= TREE_CHAIN (parameter_packs
);
3926 /* Expand any parameter packs that occur in the template arguments in
3929 expand_template_argument_pack (tree args
)
3931 if (args
== error_mark_node
)
3932 return error_mark_node
;
3934 tree result_args
= NULL_TREE
;
3935 int in_arg
, out_arg
= 0, nargs
= args
? TREE_VEC_LENGTH (args
) : 0;
3936 int num_result_args
= -1;
3937 int non_default_args_count
= -1;
3939 /* First, determine if we need to expand anything, and the number of
3940 slots we'll need. */
3941 for (in_arg
= 0; in_arg
< nargs
; ++in_arg
)
3943 tree arg
= TREE_VEC_ELT (args
, in_arg
);
3944 if (arg
== NULL_TREE
)
3946 if (ARGUMENT_PACK_P (arg
))
3948 int num_packed
= TREE_VEC_LENGTH (ARGUMENT_PACK_ARGS (arg
));
3949 if (num_result_args
< 0)
3950 num_result_args
= in_arg
+ num_packed
;
3952 num_result_args
+= num_packed
;
3956 if (num_result_args
>= 0)
3961 /* If no expansion is necessary, we're done. */
3962 if (num_result_args
< 0)
3965 /* Expand arguments. */
3966 result_args
= make_tree_vec (num_result_args
);
3967 if (NON_DEFAULT_TEMPLATE_ARGS_COUNT (args
))
3968 non_default_args_count
=
3969 GET_NON_DEFAULT_TEMPLATE_ARGS_COUNT (args
);
3970 for (in_arg
= 0; in_arg
< nargs
; ++in_arg
)
3972 tree arg
= TREE_VEC_ELT (args
, in_arg
);
3973 if (ARGUMENT_PACK_P (arg
))
3975 tree packed
= ARGUMENT_PACK_ARGS (arg
);
3976 int i
, num_packed
= TREE_VEC_LENGTH (packed
);
3977 for (i
= 0; i
< num_packed
; ++i
, ++out_arg
)
3978 TREE_VEC_ELT (result_args
, out_arg
) = TREE_VEC_ELT(packed
, i
);
3979 if (non_default_args_count
> 0)
3980 non_default_args_count
+= num_packed
- 1;
3984 TREE_VEC_ELT (result_args
, out_arg
) = arg
;
3988 if (non_default_args_count
>= 0)
3989 SET_NON_DEFAULT_TEMPLATE_ARGS_COUNT (result_args
, non_default_args_count
);
3993 /* Checks if DECL shadows a template parameter.
3995 [temp.local]: A template-parameter shall not be redeclared within its
3996 scope (including nested scopes).
3998 Emits an error and returns TRUE if the DECL shadows a parameter,
3999 returns FALSE otherwise. */
4002 check_template_shadow (tree decl
)
4006 /* If we're not in a template, we can't possibly shadow a template
4008 if (!current_template_parms
)
4011 /* Figure out what we're shadowing. */
4012 decl
= OVL_FIRST (decl
);
4013 olddecl
= innermost_non_namespace_value (DECL_NAME (decl
));
4015 /* If there's no previous binding for this name, we're not shadowing
4016 anything, let alone a template parameter. */
4020 /* If we're not shadowing a template parameter, we're done. Note
4021 that OLDDECL might be an OVERLOAD (or perhaps even an
4022 ERROR_MARK), so we can't just blithely assume it to be a _DECL
4024 if (!DECL_P (olddecl
) || !DECL_TEMPLATE_PARM_P (olddecl
))
4027 /* We check for decl != olddecl to avoid bogus errors for using a
4028 name inside a class. We check TPFI to avoid duplicate errors for
4029 inline member templates. */
4031 || (DECL_TEMPLATE_PARM_P (decl
)
4032 && TEMPLATE_PARMS_FOR_INLINE (current_template_parms
)))
4035 /* Don't complain about the injected class name, as we've already
4036 complained about the class itself. */
4037 if (DECL_SELF_REFERENCE_P (decl
))
4040 if (DECL_TEMPLATE_PARM_P (decl
))
4041 error ("declaration of template parameter %q+D shadows "
4042 "template parameter", decl
);
4044 error ("declaration of %q+#D shadows template parameter", decl
);
4045 inform (DECL_SOURCE_LOCATION (olddecl
),
4046 "template parameter %qD declared here", olddecl
);
4050 /* Return a new TEMPLATE_PARM_INDEX with the indicated INDEX, LEVEL,
4051 ORIG_LEVEL, DECL, and TYPE. */
4054 build_template_parm_index (int index
,
4060 tree t
= make_node (TEMPLATE_PARM_INDEX
);
4061 TEMPLATE_PARM_IDX (t
) = index
;
4062 TEMPLATE_PARM_LEVEL (t
) = level
;
4063 TEMPLATE_PARM_ORIG_LEVEL (t
) = orig_level
;
4064 TEMPLATE_PARM_DECL (t
) = decl
;
4065 TREE_TYPE (t
) = type
;
4066 TREE_CONSTANT (t
) = TREE_CONSTANT (decl
);
4067 TREE_READONLY (t
) = TREE_READONLY (decl
);
4072 /* Find the canonical type parameter for the given template type
4073 parameter. Returns the canonical type parameter, which may be TYPE
4074 if no such parameter existed. */
4077 canonical_type_parameter (tree type
)
4080 int idx
= TEMPLATE_TYPE_IDX (type
);
4081 if (!canonical_template_parms
)
4082 vec_alloc (canonical_template_parms
, idx
+ 1);
4084 if (canonical_template_parms
->length () <= (unsigned) idx
)
4085 vec_safe_grow_cleared (canonical_template_parms
, idx
+ 1);
4087 list
= (*canonical_template_parms
)[idx
];
4088 while (list
&& !comptypes (type
, TREE_VALUE (list
), COMPARE_STRUCTURAL
))
4089 list
= TREE_CHAIN (list
);
4092 return TREE_VALUE (list
);
4095 (*canonical_template_parms
)[idx
]
4096 = tree_cons (NULL_TREE
, type
, (*canonical_template_parms
)[idx
]);
4101 /* Return a TEMPLATE_PARM_INDEX, similar to INDEX, but whose
4102 TEMPLATE_PARM_LEVEL has been decreased by LEVELS. If such a
4103 TEMPLATE_PARM_INDEX already exists, it is returned; otherwise, a
4104 new one is created. */
4107 reduce_template_parm_level (tree index
, tree type
, int levels
, tree args
,
4108 tsubst_flags_t complain
)
4110 if (TEMPLATE_PARM_DESCENDANTS (index
) == NULL_TREE
4111 || (TEMPLATE_PARM_LEVEL (TEMPLATE_PARM_DESCENDANTS (index
))
4112 != TEMPLATE_PARM_LEVEL (index
) - levels
)
4113 || !same_type_p (type
, TREE_TYPE (TEMPLATE_PARM_DESCENDANTS (index
))))
4115 tree orig_decl
= TEMPLATE_PARM_DECL (index
);
4118 decl
= build_decl (DECL_SOURCE_LOCATION (orig_decl
),
4119 TREE_CODE (orig_decl
), DECL_NAME (orig_decl
), type
);
4120 TREE_CONSTANT (decl
) = TREE_CONSTANT (orig_decl
);
4121 TREE_READONLY (decl
) = TREE_READONLY (orig_decl
);
4122 DECL_ARTIFICIAL (decl
) = 1;
4123 SET_DECL_TEMPLATE_PARM_P (decl
);
4125 t
= build_template_parm_index (TEMPLATE_PARM_IDX (index
),
4126 TEMPLATE_PARM_LEVEL (index
) - levels
,
4127 TEMPLATE_PARM_ORIG_LEVEL (index
),
4129 TEMPLATE_PARM_DESCENDANTS (index
) = t
;
4130 TEMPLATE_PARM_PARAMETER_PACK (t
)
4131 = TEMPLATE_PARM_PARAMETER_PACK (index
);
4133 /* Template template parameters need this. */
4134 if (TREE_CODE (decl
) == TEMPLATE_DECL
)
4136 DECL_TEMPLATE_RESULT (decl
)
4137 = build_decl (DECL_SOURCE_LOCATION (decl
),
4138 TYPE_DECL
, DECL_NAME (decl
), type
);
4139 DECL_ARTIFICIAL (DECL_TEMPLATE_RESULT (decl
)) = true;
4140 DECL_TEMPLATE_PARMS (decl
) = tsubst_template_parms
4141 (DECL_TEMPLATE_PARMS (orig_decl
), args
, complain
);
4145 return TEMPLATE_PARM_DESCENDANTS (index
);
4148 /* Process information from new template parameter PARM and append it
4149 to the LIST being built. This new parameter is a non-type
4150 parameter iff IS_NON_TYPE is true. This new parameter is a
4151 parameter pack iff IS_PARAMETER_PACK is true. The location of PARM
4155 process_template_parm (tree list
, location_t parm_loc
, tree parm
,
4156 bool is_non_type
, bool is_parameter_pack
)
4161 gcc_assert (TREE_CODE (parm
) == TREE_LIST
);
4162 tree defval
= TREE_PURPOSE (parm
);
4163 tree constr
= TREE_TYPE (parm
);
4167 tree p
= tree_last (list
);
4169 if (p
&& TREE_VALUE (p
) != error_mark_node
)
4172 if (TREE_CODE (p
) == TYPE_DECL
|| TREE_CODE (p
) == TEMPLATE_DECL
)
4173 idx
= TEMPLATE_TYPE_IDX (TREE_TYPE (p
));
4175 idx
= TEMPLATE_PARM_IDX (DECL_INITIAL (p
));
4183 parm
= TREE_VALUE (parm
);
4185 SET_DECL_TEMPLATE_PARM_P (parm
);
4187 if (TREE_TYPE (parm
) != error_mark_node
)
4191 The top-level cv-qualifiers on the template-parameter are
4192 ignored when determining its type. */
4193 TREE_TYPE (parm
) = TYPE_MAIN_VARIANT (TREE_TYPE (parm
));
4194 if (invalid_nontype_parm_type_p (TREE_TYPE (parm
), 1))
4195 TREE_TYPE (parm
) = error_mark_node
;
4196 else if (uses_parameter_packs (TREE_TYPE (parm
))
4197 && !is_parameter_pack
4198 /* If we're in a nested template parameter list, the template
4199 template parameter could be a parameter pack. */
4200 && processing_template_parmlist
== 1)
4202 /* This template parameter is not a parameter pack, but it
4203 should be. Complain about "bare" parameter packs. */
4204 check_for_bare_parameter_packs (TREE_TYPE (parm
));
4206 /* Recover by calling this a parameter pack. */
4207 is_parameter_pack
= true;
4211 /* A template parameter is not modifiable. */
4212 TREE_CONSTANT (parm
) = 1;
4213 TREE_READONLY (parm
) = 1;
4214 decl
= build_decl (parm_loc
,
4215 CONST_DECL
, DECL_NAME (parm
), TREE_TYPE (parm
));
4216 TREE_CONSTANT (decl
) = 1;
4217 TREE_READONLY (decl
) = 1;
4218 DECL_INITIAL (parm
) = DECL_INITIAL (decl
)
4219 = build_template_parm_index (idx
, processing_template_decl
,
4220 processing_template_decl
,
4221 decl
, TREE_TYPE (parm
));
4223 TEMPLATE_PARM_PARAMETER_PACK (DECL_INITIAL (parm
))
4224 = is_parameter_pack
;
4229 parm
= TREE_VALUE (TREE_VALUE (parm
));
4231 if (parm
&& TREE_CODE (parm
) == TEMPLATE_DECL
)
4233 t
= cxx_make_type (TEMPLATE_TEMPLATE_PARM
);
4234 /* This is for distinguishing between real templates and template
4235 template parameters */
4236 TREE_TYPE (parm
) = t
;
4237 TREE_TYPE (DECL_TEMPLATE_RESULT (parm
)) = t
;
4242 t
= cxx_make_type (TEMPLATE_TYPE_PARM
);
4243 /* parm is either IDENTIFIER_NODE or NULL_TREE. */
4244 decl
= build_decl (parm_loc
,
4245 TYPE_DECL
, parm
, t
);
4248 TYPE_NAME (t
) = decl
;
4249 TYPE_STUB_DECL (t
) = decl
;
4251 TEMPLATE_TYPE_PARM_INDEX (t
)
4252 = build_template_parm_index (idx
, processing_template_decl
,
4253 processing_template_decl
,
4254 decl
, TREE_TYPE (parm
));
4255 TEMPLATE_TYPE_PARAMETER_PACK (t
) = is_parameter_pack
;
4256 TYPE_CANONICAL (t
) = canonical_type_parameter (t
);
4258 DECL_ARTIFICIAL (decl
) = 1;
4259 SET_DECL_TEMPLATE_PARM_P (decl
);
4261 /* Build requirements for the type/template parameter.
4262 This must be done after SET_DECL_TEMPLATE_PARM_P or
4263 process_template_parm could fail. */
4264 tree reqs
= finish_shorthand_constraint (parm
, constr
);
4268 /* Build the parameter node linking the parameter declaration,
4269 its default argument (if any), and its constraints (if any). */
4270 parm
= build_tree_list (defval
, parm
);
4271 TEMPLATE_PARM_CONSTRAINTS (parm
) = reqs
;
4273 return chainon (list
, parm
);
4276 /* The end of a template parameter list has been reached. Process the
4277 tree list into a parameter vector, converting each parameter into a more
4278 useful form. Type parameters are saved as IDENTIFIER_NODEs, and others
4282 end_template_parm_list (tree parms
)
4286 tree saved_parmlist
= make_tree_vec (list_length (parms
));
4288 /* Pop the dummy parameter level and add the real one. */
4289 current_template_parms
= TREE_CHAIN (current_template_parms
);
4291 current_template_parms
4292 = tree_cons (size_int (processing_template_decl
),
4293 saved_parmlist
, current_template_parms
);
4295 for (parm
= parms
, nparms
= 0; parm
; parm
= next
, nparms
++)
4297 next
= TREE_CHAIN (parm
);
4298 TREE_VEC_ELT (saved_parmlist
, nparms
) = parm
;
4299 TREE_CHAIN (parm
) = NULL_TREE
;
4302 --processing_template_parmlist
;
4304 return saved_parmlist
;
4307 // Explicitly indicate the end of the template parameter list. We assume
4308 // that the current template parameters have been constructed and/or
4309 // managed explicitly, as when creating new template template parameters
4310 // from a shorthand constraint.
4312 end_template_parm_list ()
4314 --processing_template_parmlist
;
4317 /* end_template_decl is called after a template declaration is seen. */
4320 end_template_decl (void)
4322 reset_specialization ();
4324 if (! processing_template_decl
)
4327 /* This matches the pushlevel in begin_template_parm_list. */
4330 --processing_template_decl
;
4331 current_template_parms
= TREE_CHAIN (current_template_parms
);
4334 /* Takes a TREE_LIST representing a template parameter and convert it
4335 into an argument suitable to be passed to the type substitution
4336 functions. Note that If the TREE_LIST contains an error_mark
4337 node, the returned argument is error_mark_node. */
4340 template_parm_to_arg (tree t
)
4344 || TREE_CODE (t
) != TREE_LIST
)
4347 if (error_operand_p (TREE_VALUE (t
)))
4348 return error_mark_node
;
4352 if (TREE_CODE (t
) == TYPE_DECL
4353 || TREE_CODE (t
) == TEMPLATE_DECL
)
4357 if (TEMPLATE_TYPE_PARAMETER_PACK (t
))
4359 /* Turn this argument into a TYPE_ARGUMENT_PACK
4360 with a single element, which expands T. */
4361 tree vec
= make_tree_vec (1);
4363 SET_NON_DEFAULT_TEMPLATE_ARGS_COUNT (vec
, TREE_VEC_LENGTH (vec
));
4365 TREE_VEC_ELT (vec
, 0) = make_pack_expansion (t
);
4367 t
= cxx_make_type (TYPE_ARGUMENT_PACK
);
4368 SET_ARGUMENT_PACK_ARGS (t
, vec
);
4373 t
= DECL_INITIAL (t
);
4375 if (TEMPLATE_PARM_PARAMETER_PACK (t
))
4377 /* Turn this argument into a NONTYPE_ARGUMENT_PACK
4378 with a single element, which expands T. */
4379 tree vec
= make_tree_vec (1);
4381 SET_NON_DEFAULT_TEMPLATE_ARGS_COUNT (vec
, TREE_VEC_LENGTH (vec
));
4383 t
= convert_from_reference (t
);
4384 TREE_VEC_ELT (vec
, 0) = make_pack_expansion (t
);
4386 t
= make_node (NONTYPE_ARGUMENT_PACK
);
4387 SET_ARGUMENT_PACK_ARGS (t
, vec
);
4390 t
= convert_from_reference (t
);
4395 /* Given a single level of template parameters (a TREE_VEC), return it
4396 as a set of template arguments. */
4399 template_parms_level_to_args (tree parms
)
4401 tree a
= copy_node (parms
);
4402 TREE_TYPE (a
) = NULL_TREE
;
4403 for (int i
= TREE_VEC_LENGTH (a
) - 1; i
>= 0; --i
)
4404 TREE_VEC_ELT (a
, i
) = template_parm_to_arg (TREE_VEC_ELT (a
, i
));
4407 SET_NON_DEFAULT_TEMPLATE_ARGS_COUNT (a
, TREE_VEC_LENGTH (a
));
4412 /* Given a set of template parameters, return them as a set of template
4413 arguments. The template parameters are represented as a TREE_VEC, in
4414 the form documented in cp-tree.h for template arguments. */
4417 template_parms_to_args (tree parms
)
4420 tree args
= NULL_TREE
;
4421 int length
= TMPL_PARMS_DEPTH (parms
);
4424 /* If there is only one level of template parameters, we do not
4425 create a TREE_VEC of TREE_VECs. Instead, we return a single
4426 TREE_VEC containing the arguments. */
4428 args
= make_tree_vec (length
);
4430 for (header
= parms
; header
; header
= TREE_CHAIN (header
))
4432 tree a
= template_parms_level_to_args (TREE_VALUE (header
));
4435 TREE_VEC_ELT (args
, --l
) = a
;
4443 /* Within the declaration of a template, return the currently active
4444 template parameters as an argument TREE_VEC. */
4447 current_template_args (void)
4449 return template_parms_to_args (current_template_parms
);
4452 /* Update the declared TYPE by doing any lookups which were thought to be
4453 dependent, but are not now that we know the SCOPE of the declarator. */
4456 maybe_update_decl_type (tree orig_type
, tree scope
)
4458 tree type
= orig_type
;
4460 if (type
== NULL_TREE
)
4463 if (TREE_CODE (orig_type
) == TYPE_DECL
)
4464 type
= TREE_TYPE (type
);
4466 if (scope
&& TYPE_P (scope
) && dependent_type_p (scope
)
4467 && dependent_type_p (type
)
4468 /* Don't bother building up the args in this case. */
4469 && TREE_CODE (type
) != TEMPLATE_TYPE_PARM
)
4471 /* tsubst in the args corresponding to the template parameters,
4472 including auto if present. Most things will be unchanged, but
4473 make_typename_type and tsubst_qualified_id will resolve
4474 TYPENAME_TYPEs and SCOPE_REFs that were previously dependent. */
4475 tree args
= current_template_args ();
4476 tree auto_node
= type_uses_auto (type
);
4480 tree auto_vec
= make_tree_vec (1);
4481 TREE_VEC_ELT (auto_vec
, 0) = auto_node
;
4482 args
= add_to_template_args (args
, auto_vec
);
4484 pushed
= push_scope (scope
);
4485 type
= tsubst (type
, args
, tf_warning_or_error
, NULL_TREE
);
4490 if (type
== error_mark_node
)
4493 if (TREE_CODE (orig_type
) == TYPE_DECL
)
4495 if (same_type_p (type
, TREE_TYPE (orig_type
)))
4498 type
= TYPE_NAME (type
);
4503 /* Return a TEMPLATE_DECL corresponding to DECL, using the indicated
4504 template PARMS and constraints, CONSTR. If MEMBER_TEMPLATE_P is true,
4505 the new template is a member template. */
4508 build_template_decl (tree decl
, tree parms
, bool member_template_p
)
4510 tree tmpl
= build_lang_decl (TEMPLATE_DECL
, DECL_NAME (decl
), NULL_TREE
);
4511 DECL_TEMPLATE_PARMS (tmpl
) = parms
;
4512 DECL_CONTEXT (tmpl
) = DECL_CONTEXT (decl
);
4513 DECL_SOURCE_LOCATION (tmpl
) = DECL_SOURCE_LOCATION (decl
);
4514 DECL_MEMBER_TEMPLATE_P (tmpl
) = member_template_p
;
4519 struct template_parm_data
4521 /* The level of the template parameters we are currently
4525 /* The index of the specialization argument we are currently
4529 /* An array whose size is the number of template parameters. The
4530 elements are nonzero if the parameter has been used in any one
4531 of the arguments processed so far. */
4534 /* An array whose size is the number of template arguments. The
4535 elements are nonzero if the argument makes use of template
4536 parameters of this level. */
4537 int* arg_uses_template_parms
;
4540 /* Subroutine of push_template_decl used to see if each template
4541 parameter in a partial specialization is used in the explicit
4542 argument list. If T is of the LEVEL given in DATA (which is
4543 treated as a template_parm_data*), then DATA->PARMS is marked
4547 mark_template_parm (tree t
, void* data
)
4551 struct template_parm_data
* tpd
= (struct template_parm_data
*) data
;
4553 template_parm_level_and_index (t
, &level
, &idx
);
4555 if (level
== tpd
->level
)
4557 tpd
->parms
[idx
] = 1;
4558 tpd
->arg_uses_template_parms
[tpd
->current_arg
] = 1;
4561 /* In C++17 the type of a non-type argument is a deduced context. */
4562 if (cxx_dialect
>= cxx17
4563 && TREE_CODE (t
) == TEMPLATE_PARM_INDEX
)
4564 for_each_template_parm (TREE_TYPE (t
),
4565 &mark_template_parm
,
4568 /*include_nondeduced_p=*/false);
4570 /* Return zero so that for_each_template_parm will continue the
4571 traversal of the tree; we want to mark *every* template parm. */
4575 /* Process the partial specialization DECL. */
4578 process_partial_specialization (tree decl
)
4580 tree type
= TREE_TYPE (decl
);
4581 tree tinfo
= get_template_info (decl
);
4582 tree maintmpl
= TI_TEMPLATE (tinfo
);
4583 tree specargs
= TI_ARGS (tinfo
);
4584 tree inner_args
= INNERMOST_TEMPLATE_ARGS (specargs
);
4585 tree main_inner_parms
= DECL_INNERMOST_TEMPLATE_PARMS (maintmpl
);
4588 int nargs
= TREE_VEC_LENGTH (inner_args
);
4591 bool did_error_intro
= false;
4592 struct template_parm_data tpd
;
4593 struct template_parm_data tpd2
;
4595 gcc_assert (current_template_parms
);
4597 /* A concept cannot be specialized. */
4598 if (flag_concepts
&& variable_concept_p (maintmpl
))
4600 error ("specialization of variable concept %q#D", maintmpl
);
4601 return error_mark_node
;
4604 inner_parms
= INNERMOST_TEMPLATE_PARMS (current_template_parms
);
4605 ntparms
= TREE_VEC_LENGTH (inner_parms
);
4607 /* We check that each of the template parameters given in the
4608 partial specialization is used in the argument list to the
4609 specialization. For example:
4611 template <class T> struct S;
4612 template <class T> struct S<T*>;
4614 The second declaration is OK because `T*' uses the template
4615 parameter T, whereas
4617 template <class T> struct S<int>;
4619 is no good. Even trickier is:
4630 The S2<T> declaration is actually invalid; it is a
4631 full-specialization. Of course,
4634 struct S2<T (*)(U)>;
4636 or some such would have been OK. */
4637 tpd
.level
= TMPL_PARMS_DEPTH (current_template_parms
);
4638 tpd
.parms
= XALLOCAVEC (int, ntparms
);
4639 memset (tpd
.parms
, 0, sizeof (int) * ntparms
);
4641 tpd
.arg_uses_template_parms
= XALLOCAVEC (int, nargs
);
4642 memset (tpd
.arg_uses_template_parms
, 0, sizeof (int) * nargs
);
4643 for (i
= 0; i
< nargs
; ++i
)
4645 tpd
.current_arg
= i
;
4646 for_each_template_parm (TREE_VEC_ELT (inner_args
, i
),
4647 &mark_template_parm
,
4650 /*include_nondeduced_p=*/false);
4652 for (i
= 0; i
< ntparms
; ++i
)
4653 if (tpd
.parms
[i
] == 0)
4655 /* One of the template parms was not used in a deduced context in the
4657 if (!did_error_intro
)
4659 error ("template parameters not deducible in "
4660 "partial specialization:");
4661 did_error_intro
= true;
4664 inform (input_location
, " %qD",
4665 TREE_VALUE (TREE_VEC_ELT (inner_parms
, i
)));
4668 if (did_error_intro
)
4669 return error_mark_node
;
4671 /* [temp.class.spec]
4673 The argument list of the specialization shall not be identical to
4674 the implicit argument list of the primary template. */
4676 = TI_ARGS (get_template_info (DECL_TEMPLATE_RESULT (maintmpl
)));
4677 if (comp_template_args (inner_args
, INNERMOST_TEMPLATE_ARGS (main_args
))
4679 || !strictly_subsumes (current_template_constraints (),
4680 get_constraints (maintmpl
))))
4683 error ("partial specialization %q+D does not specialize "
4684 "any template arguments", decl
);
4686 error ("partial specialization %q+D does not specialize any "
4687 "template arguments and is not more constrained than", decl
);
4688 inform (DECL_SOURCE_LOCATION (maintmpl
), "primary template here");
4691 /* A partial specialization that replaces multiple parameters of the
4692 primary template with a pack expansion is less specialized for those
4694 if (nargs
< DECL_NTPARMS (maintmpl
))
4696 error ("partial specialization is not more specialized than the "
4697 "primary template because it replaces multiple parameters "
4698 "with a pack expansion");
4699 inform (DECL_SOURCE_LOCATION (maintmpl
), "primary template here");
4700 /* Avoid crash in process_partial_specialization. */
4704 /* If we aren't in a dependent class, we can actually try deduction. */
4705 else if (tpd
.level
== 1
4706 /* FIXME we should be able to handle a partial specialization of a
4707 partial instantiation, but currently we can't (c++/41727). */
4708 && TMPL_ARGS_DEPTH (specargs
) == 1
4709 && !get_partial_spec_bindings (maintmpl
, maintmpl
, specargs
))
4711 if (permerror (input_location
, "partial specialization %qD is not "
4712 "more specialized than", decl
))
4713 inform (DECL_SOURCE_LOCATION (maintmpl
), "primary template %qD",
4717 /* [temp.class.spec]
4719 A partially specialized non-type argument expression shall not
4720 involve template parameters of the partial specialization except
4721 when the argument expression is a simple identifier.
4723 The type of a template parameter corresponding to a specialized
4724 non-type argument shall not be dependent on a parameter of the
4727 Also, we verify that pack expansions only occur at the
4728 end of the argument list. */
4729 gcc_assert (nargs
== DECL_NTPARMS (maintmpl
));
4731 for (i
= 0; i
< nargs
; ++i
)
4733 tree parm
= TREE_VALUE (TREE_VEC_ELT (main_inner_parms
, i
));
4734 tree arg
= TREE_VEC_ELT (inner_args
, i
);
4735 tree packed_args
= NULL_TREE
;
4738 if (ARGUMENT_PACK_P (arg
))
4740 /* Extract the arguments from the argument pack. We'll be
4741 iterating over these in the following loop. */
4742 packed_args
= ARGUMENT_PACK_ARGS (arg
);
4743 len
= TREE_VEC_LENGTH (packed_args
);
4746 for (j
= 0; j
< len
; j
++)
4749 /* Get the Jth argument in the parameter pack. */
4750 arg
= TREE_VEC_ELT (packed_args
, j
);
4752 if (PACK_EXPANSION_P (arg
))
4754 /* Pack expansions must come at the end of the
4756 if ((packed_args
&& j
< len
- 1)
4757 || (!packed_args
&& i
< nargs
- 1))
4759 if (TREE_CODE (arg
) == EXPR_PACK_EXPANSION
)
4760 error ("parameter pack argument %qE must be at the "
4761 "end of the template argument list", arg
);
4763 error ("parameter pack argument %qT must be at the "
4764 "end of the template argument list", arg
);
4768 if (TREE_CODE (arg
) == EXPR_PACK_EXPANSION
)
4769 /* We only care about the pattern. */
4770 arg
= PACK_EXPANSION_PATTERN (arg
);
4772 if (/* These first two lines are the `non-type' bit. */
4774 && TREE_CODE (arg
) != TEMPLATE_DECL
4775 /* This next two lines are the `argument expression is not just a
4776 simple identifier' condition and also the `specialized
4777 non-type argument' bit. */
4778 && TREE_CODE (arg
) != TEMPLATE_PARM_INDEX
4779 && !(REFERENCE_REF_P (arg
)
4780 && TREE_CODE (TREE_OPERAND (arg
, 0)) == TEMPLATE_PARM_INDEX
))
4782 if ((!packed_args
&& tpd
.arg_uses_template_parms
[i
])
4783 || (packed_args
&& uses_template_parms (arg
)))
4784 error ("template argument %qE involves template parameter(s)",
4788 /* Look at the corresponding template parameter,
4789 marking which template parameters its type depends
4791 tree type
= TREE_TYPE (parm
);
4795 /* We haven't yet initialized TPD2. Do so now. */
4796 tpd2
.arg_uses_template_parms
= XALLOCAVEC (int, nargs
);
4797 /* The number of parameters here is the number in the
4798 main template, which, as checked in the assertion
4800 tpd2
.parms
= XALLOCAVEC (int, nargs
);
4802 TMPL_PARMS_DEPTH (DECL_TEMPLATE_PARMS (maintmpl
));
4805 /* Mark the template parameters. But this time, we're
4806 looking for the template parameters of the main
4807 template, not in the specialization. */
4808 tpd2
.current_arg
= i
;
4809 tpd2
.arg_uses_template_parms
[i
] = 0;
4810 memset (tpd2
.parms
, 0, sizeof (int) * nargs
);
4811 for_each_template_parm (type
,
4812 &mark_template_parm
,
4815 /*include_nondeduced_p=*/false);
4817 if (tpd2
.arg_uses_template_parms
[i
])
4819 /* The type depended on some template parameters.
4820 If they are fully specialized in the
4821 specialization, that's OK. */
4824 for (j
= 0; j
< nargs
; ++j
)
4825 if (tpd2
.parms
[j
] != 0
4826 && tpd
.arg_uses_template_parms
[j
])
4829 error_n (input_location
, count
,
4830 "type %qT of template argument %qE depends "
4831 "on a template parameter",
4832 "type %qT of template argument %qE depends "
4833 "on template parameters",
4842 /* We should only get here once. */
4843 if (TREE_CODE (decl
) == TYPE_DECL
)
4844 gcc_assert (!COMPLETE_TYPE_P (type
));
4846 // Build the template decl.
4847 tree tmpl
= build_template_decl (decl
, current_template_parms
,
4848 DECL_MEMBER_TEMPLATE_P (maintmpl
));
4849 TREE_TYPE (tmpl
) = type
;
4850 DECL_TEMPLATE_RESULT (tmpl
) = decl
;
4851 SET_DECL_TEMPLATE_SPECIALIZATION (tmpl
);
4852 DECL_TEMPLATE_INFO (tmpl
) = build_template_info (maintmpl
, specargs
);
4853 DECL_PRIMARY_TEMPLATE (tmpl
) = maintmpl
;
4855 /* Give template template parms a DECL_CONTEXT of the template
4856 for which they are a parameter. */
4857 for (i
= 0; i
< ntparms
; ++i
)
4859 tree parm
= TREE_VALUE (TREE_VEC_ELT (inner_parms
, i
));
4860 if (TREE_CODE (parm
) == TEMPLATE_DECL
)
4861 DECL_CONTEXT (parm
) = tmpl
;
4865 /* We didn't register this in check_explicit_specialization so we could
4866 wait until the constraints were set. */
4867 decl
= register_specialization (decl
, maintmpl
, specargs
, false, 0);
4869 associate_classtype_constraints (type
);
4871 DECL_TEMPLATE_SPECIALIZATIONS (maintmpl
)
4872 = tree_cons (specargs
, tmpl
,
4873 DECL_TEMPLATE_SPECIALIZATIONS (maintmpl
));
4874 TREE_TYPE (DECL_TEMPLATE_SPECIALIZATIONS (maintmpl
)) = type
;
4876 for (inst
= DECL_TEMPLATE_INSTANTIATIONS (maintmpl
); inst
;
4877 inst
= TREE_CHAIN (inst
))
4879 tree instance
= TREE_VALUE (inst
);
4880 if (TYPE_P (instance
)
4881 ? (COMPLETE_TYPE_P (instance
)
4882 && CLASSTYPE_IMPLICIT_INSTANTIATION (instance
))
4883 : DECL_TEMPLATE_INSTANTIATION (instance
))
4885 tree spec
= most_specialized_partial_spec (instance
, tf_none
);
4886 tree inst_decl
= (DECL_P (instance
)
4887 ? instance
: TYPE_NAME (instance
));
4890 else if (spec
== error_mark_node
)
4891 permerror (input_location
,
4892 "declaration of %qD ambiguates earlier template "
4893 "instantiation for %qD", decl
, inst_decl
);
4894 else if (TREE_VALUE (spec
) == tmpl
)
4895 permerror (input_location
,
4896 "partial specialization of %qD after instantiation "
4897 "of %qD", decl
, inst_decl
);
4904 /* PARM is a template parameter of some form; return the corresponding
4905 TEMPLATE_PARM_INDEX. */
4908 get_template_parm_index (tree parm
)
4910 if (TREE_CODE (parm
) == PARM_DECL
4911 || TREE_CODE (parm
) == CONST_DECL
)
4912 parm
= DECL_INITIAL (parm
);
4913 else if (TREE_CODE (parm
) == TYPE_DECL
4914 || TREE_CODE (parm
) == TEMPLATE_DECL
)
4915 parm
= TREE_TYPE (parm
);
4916 if (TREE_CODE (parm
) == TEMPLATE_TYPE_PARM
4917 || TREE_CODE (parm
) == BOUND_TEMPLATE_TEMPLATE_PARM
4918 || TREE_CODE (parm
) == TEMPLATE_TEMPLATE_PARM
)
4919 parm
= TEMPLATE_TYPE_PARM_INDEX (parm
);
4920 gcc_assert (TREE_CODE (parm
) == TEMPLATE_PARM_INDEX
);
4924 /* Subroutine of fixed_parameter_pack_p below. Look for any template
4925 parameter packs used by the template parameter PARM. */
4928 fixed_parameter_pack_p_1 (tree parm
, struct find_parameter_pack_data
*ppd
)
4930 /* A type parm can't refer to another parm. */
4931 if (TREE_CODE (parm
) == TYPE_DECL
)
4933 else if (TREE_CODE (parm
) == PARM_DECL
)
4935 cp_walk_tree (&TREE_TYPE (parm
), &find_parameter_packs_r
,
4940 gcc_assert (TREE_CODE (parm
) == TEMPLATE_DECL
);
4942 tree vec
= INNERMOST_TEMPLATE_PARMS (DECL_TEMPLATE_PARMS (parm
));
4943 for (int i
= 0; i
< TREE_VEC_LENGTH (vec
); ++i
)
4944 fixed_parameter_pack_p_1 (TREE_VALUE (TREE_VEC_ELT (vec
, i
)), ppd
);
4947 /* PARM is a template parameter pack. Return any parameter packs used in
4948 its type or the type of any of its template parameters. If there are
4949 any such packs, it will be instantiated into a fixed template parameter
4950 list by partial instantiation rather than be fully deduced. */
4953 fixed_parameter_pack_p (tree parm
)
4955 /* This can only be true in a member template. */
4956 if (TEMPLATE_PARM_ORIG_LEVEL (get_template_parm_index (parm
)) < 2)
4958 /* This can only be true for a parameter pack. */
4959 if (!template_parameter_pack_p (parm
))
4961 /* A type parm can't refer to another parm. */
4962 if (TREE_CODE (parm
) == TYPE_DECL
)
4965 tree parameter_packs
= NULL_TREE
;
4966 struct find_parameter_pack_data ppd
;
4967 ppd
.parameter_packs
= ¶meter_packs
;
4968 ppd
.visited
= new hash_set
<tree
>;
4969 ppd
.type_pack_expansion_p
= false;
4971 fixed_parameter_pack_p_1 (parm
, &ppd
);
4974 return parameter_packs
;
4977 /* Check that a template declaration's use of default arguments and
4978 parameter packs is not invalid. Here, PARMS are the template
4979 parameters. IS_PRIMARY is true if DECL is the thing declared by
4980 a primary template. IS_PARTIAL is true if DECL is a partial
4983 IS_FRIEND_DECL is nonzero if DECL is a friend function template
4984 declaration (but not a definition); 1 indicates a declaration, 2
4985 indicates a redeclaration. When IS_FRIEND_DECL=2, no errors are
4986 emitted for extraneous default arguments.
4988 Returns TRUE if there were no errors found, FALSE otherwise. */
4991 check_default_tmpl_args (tree decl
, tree parms
, bool is_primary
,
4992 bool is_partial
, int is_friend_decl
)
4995 int last_level_to_check
;
4997 bool no_errors
= true;
5001 A default template-argument shall not be specified in a
5002 function template declaration or a function template definition, nor
5003 in the template-parameter-list of the definition of a member of a
5006 if (TREE_CODE (CP_DECL_CONTEXT (decl
)) == FUNCTION_DECL
5007 || (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_LOCAL_FUNCTION_P (decl
)))
5008 /* You can't have a function template declaration in a local
5009 scope, nor you can you define a member of a class template in a
5013 if ((TREE_CODE (decl
) == TYPE_DECL
5015 && LAMBDA_TYPE_P (TREE_TYPE (decl
)))
5016 || (TREE_CODE (decl
) == FUNCTION_DECL
5017 && LAMBDA_FUNCTION_P (decl
)))
5018 /* A lambda doesn't have an explicit declaration; don't complain
5019 about the parms of the enclosing class. */
5022 if (current_class_type
5023 && !TYPE_BEING_DEFINED (current_class_type
)
5024 && DECL_LANG_SPECIFIC (decl
)
5025 && DECL_DECLARES_FUNCTION_P (decl
)
5026 /* If this is either a friend defined in the scope of the class
5027 or a member function. */
5028 && (DECL_FUNCTION_MEMBER_P (decl
)
5029 ? same_type_p (DECL_CONTEXT (decl
), current_class_type
)
5030 : DECL_FRIEND_CONTEXT (decl
)
5031 ? same_type_p (DECL_FRIEND_CONTEXT (decl
), current_class_type
)
5033 /* And, if it was a member function, it really was defined in
5034 the scope of the class. */
5035 && (!DECL_FUNCTION_MEMBER_P (decl
)
5036 || DECL_INITIALIZED_IN_CLASS_P (decl
)))
5037 /* We already checked these parameters when the template was
5038 declared, so there's no need to do it again now. This function
5039 was defined in class scope, but we're processing its body now
5040 that the class is complete. */
5043 /* Core issue 226 (C++0x only): the following only applies to class
5046 && ((cxx_dialect
== cxx98
) || TREE_CODE (decl
) != FUNCTION_DECL
))
5050 If a template-parameter has a default template-argument, all
5051 subsequent template-parameters shall have a default
5052 template-argument supplied. */
5053 for (parm_level
= parms
; parm_level
; parm_level
= TREE_CHAIN (parm_level
))
5055 tree inner_parms
= TREE_VALUE (parm_level
);
5056 int ntparms
= TREE_VEC_LENGTH (inner_parms
);
5057 int seen_def_arg_p
= 0;
5060 for (i
= 0; i
< ntparms
; ++i
)
5062 tree parm
= TREE_VEC_ELT (inner_parms
, i
);
5064 if (parm
== error_mark_node
)
5067 if (TREE_PURPOSE (parm
))
5069 else if (seen_def_arg_p
5070 && !template_parameter_pack_p (TREE_VALUE (parm
)))
5072 error ("no default argument for %qD", TREE_VALUE (parm
));
5073 /* For better subsequent error-recovery, we indicate that
5074 there should have been a default argument. */
5075 TREE_PURPOSE (parm
) = error_mark_node
;
5078 else if (!is_partial
5080 /* Don't complain about an enclosing partial
5082 && parm_level
== parms
5083 && TREE_CODE (decl
) == TYPE_DECL
5085 && template_parameter_pack_p (TREE_VALUE (parm
))
5086 /* A fixed parameter pack will be partially
5087 instantiated into a fixed length list. */
5088 && !fixed_parameter_pack_p (TREE_VALUE (parm
)))
5090 /* A primary class template can only have one
5091 parameter pack, at the end of the template
5094 error ("parameter pack %q+D must be at the end of the"
5095 " template parameter list", TREE_VALUE (parm
));
5097 TREE_VALUE (TREE_VEC_ELT (inner_parms
, i
))
5105 if (((cxx_dialect
== cxx98
) && TREE_CODE (decl
) != TYPE_DECL
)
5109 /* For an ordinary class template, default template arguments are
5110 allowed at the innermost level, e.g.:
5111 template <class T = int>
5113 but, in a partial specialization, they're not allowed even
5114 there, as we have in [temp.class.spec]:
5116 The template parameter list of a specialization shall not
5117 contain default template argument values.
5119 So, for a partial specialization, or for a function template
5120 (in C++98/C++03), we look at all of them. */
5123 /* But, for a primary class template that is not a partial
5124 specialization we look at all template parameters except the
5126 parms
= TREE_CHAIN (parms
);
5128 /* Figure out what error message to issue. */
5129 if (is_friend_decl
== 2)
5130 msg
= G_("default template arguments may not be used in function template "
5131 "friend re-declaration");
5132 else if (is_friend_decl
)
5133 msg
= G_("default template arguments may not be used in function template "
5134 "friend declarations");
5135 else if (TREE_CODE (decl
) == FUNCTION_DECL
&& (cxx_dialect
== cxx98
))
5136 msg
= G_("default template arguments may not be used in function templates "
5137 "without -std=c++11 or -std=gnu++11");
5138 else if (is_partial
)
5139 msg
= G_("default template arguments may not be used in "
5140 "partial specializations");
5141 else if (current_class_type
&& CLASSTYPE_IS_TEMPLATE (current_class_type
))
5142 msg
= G_("default argument for template parameter for class enclosing %qD");
5144 /* Per [temp.param]/9, "A default template-argument shall not be
5145 specified in the template-parameter-lists of the definition of
5146 a member of a class template that appears outside of the member's
5147 class.", thus if we aren't handling a member of a class template
5148 there is no need to examine the parameters. */
5151 if (current_class_type
&& TYPE_BEING_DEFINED (current_class_type
))
5152 /* If we're inside a class definition, there's no need to
5153 examine the parameters to the class itself. On the one
5154 hand, they will be checked when the class is defined, and,
5155 on the other, default arguments are valid in things like:
5156 template <class T = double>
5157 struct S { template <class U> void f(U); };
5158 Here the default argument for `S' has no bearing on the
5159 declaration of `f'. */
5160 last_level_to_check
= template_class_depth (current_class_type
) + 1;
5162 /* Check everything. */
5163 last_level_to_check
= 0;
5165 for (parm_level
= parms
;
5166 parm_level
&& TMPL_PARMS_DEPTH (parm_level
) >= last_level_to_check
;
5167 parm_level
= TREE_CHAIN (parm_level
))
5169 tree inner_parms
= TREE_VALUE (parm_level
);
5173 ntparms
= TREE_VEC_LENGTH (inner_parms
);
5174 for (i
= 0; i
< ntparms
; ++i
)
5176 if (TREE_VEC_ELT (inner_parms
, i
) == error_mark_node
)
5179 if (TREE_PURPOSE (TREE_VEC_ELT (inner_parms
, i
)))
5184 if (is_friend_decl
== 2)
5191 /* Clear out the default argument so that we are not
5193 TREE_PURPOSE (TREE_VEC_ELT (inner_parms
, i
)) = NULL_TREE
;
5197 /* At this point, if we're still interested in issuing messages,
5198 they must apply to classes surrounding the object declared. */
5200 msg
= G_("default argument for template parameter for class "
5207 /* Worker for push_template_decl_real, called via
5208 for_each_template_parm. DATA is really an int, indicating the
5209 level of the parameters we are interested in. If T is a template
5210 parameter of that level, return nonzero. */
5213 template_parm_this_level_p (tree t
, void* data
)
5215 int this_level
= *(int *)data
;
5218 if (TREE_CODE (t
) == TEMPLATE_PARM_INDEX
)
5219 level
= TEMPLATE_PARM_LEVEL (t
);
5221 level
= TEMPLATE_TYPE_LEVEL (t
);
5222 return level
== this_level
;
5225 /* Worker for uses_outer_template_parms, called via for_each_template_parm.
5226 DATA is really an int, indicating the innermost outer level of parameters.
5227 If T is a template parameter of that level or further out, return
5231 template_parm_outer_level (tree t
, void *data
)
5233 int this_level
= *(int *)data
;
5236 if (TREE_CODE (t
) == TEMPLATE_PARM_INDEX
)
5237 level
= TEMPLATE_PARM_LEVEL (t
);
5239 level
= TEMPLATE_TYPE_LEVEL (t
);
5240 return level
<= this_level
;
5243 /* Creates a TEMPLATE_DECL for the indicated DECL using the template
5244 parameters given by current_template_args, or reuses a
5245 previously existing one, if appropriate. Returns the DECL, or an
5246 equivalent one, if it is replaced via a call to duplicate_decls.
5248 If IS_FRIEND is true, DECL is a friend declaration. */
5251 push_template_decl_real (tree decl
, bool is_friend
)
5259 int new_template_p
= 0;
5260 /* True if the template is a member template, in the sense of
5262 bool member_template_p
= false;
5264 if (decl
== error_mark_node
|| !current_template_parms
)
5265 return error_mark_node
;
5267 /* See if this is a partial specialization. */
5268 is_partial
= ((DECL_IMPLICIT_TYPEDEF_P (decl
)
5269 && TREE_CODE (TREE_TYPE (decl
)) != ENUMERAL_TYPE
5270 && CLASSTYPE_TEMPLATE_SPECIALIZATION (TREE_TYPE (decl
)))
5272 && DECL_LANG_SPECIFIC (decl
)
5273 && DECL_TEMPLATE_SPECIALIZATION (decl
)
5274 && TINFO_USED_TEMPLATE_ID (DECL_TEMPLATE_INFO (decl
))));
5276 if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_FRIEND_P (decl
))
5280 /* For a friend, we want the context of the friend function, not
5281 the type of which it is a friend. */
5282 ctx
= CP_DECL_CONTEXT (decl
);
5283 else if (CP_DECL_CONTEXT (decl
)
5284 && TREE_CODE (CP_DECL_CONTEXT (decl
)) != NAMESPACE_DECL
)
5285 /* In the case of a virtual function, we want the class in which
5287 ctx
= CP_DECL_CONTEXT (decl
);
5289 /* Otherwise, if we're currently defining some class, the DECL
5290 is assumed to be a member of the class. */
5291 ctx
= current_scope ();
5293 if (ctx
&& TREE_CODE (ctx
) == NAMESPACE_DECL
)
5296 if (!DECL_CONTEXT (decl
))
5297 DECL_CONTEXT (decl
) = FROB_CONTEXT (current_namespace
);
5299 /* See if this is a primary template. */
5300 if (is_friend
&& ctx
5301 && uses_template_parms_level (ctx
, processing_template_decl
))
5302 /* A friend template that specifies a class context, i.e.
5303 template <typename T> friend void A<T>::f();
5306 else if (TREE_CODE (decl
) == TYPE_DECL
5307 && LAMBDA_TYPE_P (TREE_TYPE (decl
)))
5310 is_primary
= template_parm_scope_p ();
5314 warning (OPT_Wtemplates
, "template %qD declared", decl
);
5316 if (DECL_CLASS_SCOPE_P (decl
))
5317 member_template_p
= true;
5318 if (TREE_CODE (decl
) == TYPE_DECL
5319 && anon_aggrname_p (DECL_NAME (decl
)))
5321 error ("template class without a name");
5322 return error_mark_node
;
5324 else if (TREE_CODE (decl
) == FUNCTION_DECL
)
5326 if (member_template_p
)
5328 if (DECL_OVERRIDE_P (decl
) || DECL_FINAL_P (decl
))
5329 error ("member template %qD may not have virt-specifiers", decl
);
5331 if (DECL_DESTRUCTOR_P (decl
))
5335 A destructor shall not be a member template. */
5336 error ("destructor %qD declared as member template", decl
);
5337 return error_mark_node
;
5339 if (IDENTIFIER_NEWDEL_OP_P (DECL_NAME (decl
))
5340 && (!prototype_p (TREE_TYPE (decl
))
5341 || TYPE_ARG_TYPES (TREE_TYPE (decl
)) == void_list_node
5342 || !TREE_CHAIN (TYPE_ARG_TYPES (TREE_TYPE (decl
)))
5343 || (TREE_CHAIN (TYPE_ARG_TYPES (TREE_TYPE (decl
)))
5344 == void_list_node
)))
5346 /* [basic.stc.dynamic.allocation]
5348 An allocation function can be a function
5349 template. ... Template allocation functions shall
5350 have two or more parameters. */
5351 error ("invalid template declaration of %qD", decl
);
5352 return error_mark_node
;
5355 else if (DECL_IMPLICIT_TYPEDEF_P (decl
)
5356 && CLASS_TYPE_P (TREE_TYPE (decl
)))
5358 /* Class template, set TEMPLATE_TYPE_PARM_FOR_CLASS. */
5359 tree parms
= INNERMOST_TEMPLATE_PARMS (current_template_parms
);
5360 for (int i
= 0; i
< TREE_VEC_LENGTH (parms
); ++i
)
5362 tree t
= TREE_VALUE (TREE_VEC_ELT (parms
, i
));
5363 if (TREE_CODE (t
) == TYPE_DECL
)
5365 if (TREE_CODE (t
) == TEMPLATE_TYPE_PARM
)
5366 TEMPLATE_TYPE_PARM_FOR_CLASS (t
) = true;
5369 else if (TREE_CODE (decl
) == TYPE_DECL
5370 && TYPE_DECL_ALIAS_P (decl
))
5371 /* alias-declaration */
5372 gcc_assert (!DECL_ARTIFICIAL (decl
));
5373 else if (VAR_P (decl
))
5374 /* C++14 variable template. */;
5377 error ("template declaration of %q#D", decl
);
5378 return error_mark_node
;
5382 /* Check to see that the rules regarding the use of default
5383 arguments are not being violated. */
5384 check_default_tmpl_args (decl
, current_template_parms
,
5385 is_primary
, is_partial
, /*is_friend_decl=*/0);
5387 /* Ensure that there are no parameter packs in the type of this
5388 declaration that have not been expanded. */
5389 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5391 /* Check each of the arguments individually to see if there are
5392 any bare parameter packs. */
5393 tree type
= TREE_TYPE (decl
);
5394 tree arg
= DECL_ARGUMENTS (decl
);
5395 tree argtype
= TYPE_ARG_TYPES (type
);
5397 while (arg
&& argtype
)
5399 if (!DECL_PACK_P (arg
)
5400 && check_for_bare_parameter_packs (TREE_TYPE (arg
)))
5402 /* This is a PARM_DECL that contains unexpanded parameter
5403 packs. We have already complained about this in the
5404 check_for_bare_parameter_packs call, so just replace
5405 these types with ERROR_MARK_NODE. */
5406 TREE_TYPE (arg
) = error_mark_node
;
5407 TREE_VALUE (argtype
) = error_mark_node
;
5410 arg
= DECL_CHAIN (arg
);
5411 argtype
= TREE_CHAIN (argtype
);
5414 /* Check for bare parameter packs in the return type and the
5415 exception specifiers. */
5416 if (check_for_bare_parameter_packs (TREE_TYPE (type
)))
5417 /* Errors were already issued, set return type to int
5418 as the frontend doesn't expect error_mark_node as
5420 TREE_TYPE (type
) = integer_type_node
;
5421 if (check_for_bare_parameter_packs (TYPE_RAISES_EXCEPTIONS (type
)))
5422 TYPE_RAISES_EXCEPTIONS (type
) = NULL_TREE
;
5424 else if (check_for_bare_parameter_packs ((TREE_CODE (decl
) == TYPE_DECL
5425 && TYPE_DECL_ALIAS_P (decl
))
5426 ? DECL_ORIGINAL_TYPE (decl
)
5427 : TREE_TYPE (decl
)))
5429 TREE_TYPE (decl
) = error_mark_node
;
5430 return error_mark_node
;
5434 return process_partial_specialization (decl
);
5436 args
= current_template_args ();
5439 || TREE_CODE (ctx
) == FUNCTION_DECL
5440 || (CLASS_TYPE_P (ctx
) && TYPE_BEING_DEFINED (ctx
))
5441 || (TREE_CODE (decl
) == TYPE_DECL
5442 && LAMBDA_TYPE_P (TREE_TYPE (decl
)))
5443 || (is_friend
&& !DECL_TEMPLATE_INFO (decl
)))
5445 if (DECL_LANG_SPECIFIC (decl
)
5446 && DECL_TEMPLATE_INFO (decl
)
5447 && DECL_TI_TEMPLATE (decl
))
5448 tmpl
= DECL_TI_TEMPLATE (decl
);
5449 /* If DECL is a TYPE_DECL for a class-template, then there won't
5450 be DECL_LANG_SPECIFIC. The information equivalent to
5451 DECL_TEMPLATE_INFO is found in TYPE_TEMPLATE_INFO instead. */
5452 else if (DECL_IMPLICIT_TYPEDEF_P (decl
)
5453 && TYPE_TEMPLATE_INFO (TREE_TYPE (decl
))
5454 && TYPE_TI_TEMPLATE (TREE_TYPE (decl
)))
5456 /* Since a template declaration already existed for this
5457 class-type, we must be redeclaring it here. Make sure
5458 that the redeclaration is valid. */
5459 redeclare_class_template (TREE_TYPE (decl
),
5460 current_template_parms
,
5461 current_template_constraints ());
5462 /* We don't need to create a new TEMPLATE_DECL; just use the
5463 one we already had. */
5464 tmpl
= TYPE_TI_TEMPLATE (TREE_TYPE (decl
));
5468 tmpl
= build_template_decl (decl
, current_template_parms
,
5472 if (DECL_LANG_SPECIFIC (decl
)
5473 && DECL_TEMPLATE_SPECIALIZATION (decl
))
5475 /* A specialization of a member template of a template
5477 SET_DECL_TEMPLATE_SPECIALIZATION (tmpl
);
5478 DECL_TEMPLATE_INFO (tmpl
) = DECL_TEMPLATE_INFO (decl
);
5479 DECL_TEMPLATE_INFO (decl
) = NULL_TREE
;
5485 tree a
, t
, current
, parms
;
5487 tree tinfo
= get_template_info (decl
);
5491 error ("template definition of non-template %q#D", decl
);
5492 return error_mark_node
;
5495 tmpl
= TI_TEMPLATE (tinfo
);
5497 if (DECL_FUNCTION_TEMPLATE_P (tmpl
)
5498 && DECL_TEMPLATE_INFO (decl
) && DECL_TI_ARGS (decl
)
5499 && DECL_TEMPLATE_SPECIALIZATION (decl
)
5500 && DECL_MEMBER_TEMPLATE_P (tmpl
))
5504 /* The declaration is a specialization of a member
5505 template, declared outside the class. Therefore, the
5506 innermost template arguments will be NULL, so we
5507 replace them with the arguments determined by the
5508 earlier call to check_explicit_specialization. */
5509 args
= DECL_TI_ARGS (decl
);
5512 = build_template_decl (decl
, current_template_parms
,
5514 DECL_TEMPLATE_RESULT (new_tmpl
) = decl
;
5515 TREE_TYPE (new_tmpl
) = TREE_TYPE (decl
);
5516 DECL_TI_TEMPLATE (decl
) = new_tmpl
;
5517 SET_DECL_TEMPLATE_SPECIALIZATION (new_tmpl
);
5518 DECL_TEMPLATE_INFO (new_tmpl
)
5519 = build_template_info (tmpl
, args
);
5521 register_specialization (new_tmpl
,
5522 most_general_template (tmpl
),
5528 /* Make sure the template headers we got make sense. */
5530 parms
= DECL_TEMPLATE_PARMS (tmpl
);
5531 i
= TMPL_PARMS_DEPTH (parms
);
5532 if (TMPL_ARGS_DEPTH (args
) != i
)
5534 error ("expected %d levels of template parms for %q#D, got %d",
5535 i
, decl
, TMPL_ARGS_DEPTH (args
));
5536 DECL_INTERFACE_KNOWN (decl
) = 1;
5537 return error_mark_node
;
5540 for (current
= decl
; i
> 0; --i
, parms
= TREE_CHAIN (parms
))
5542 a
= TMPL_ARGS_LEVEL (args
, i
);
5543 t
= INNERMOST_TEMPLATE_PARMS (parms
);
5545 if (TREE_VEC_LENGTH (t
) != TREE_VEC_LENGTH (a
))
5547 if (current
== decl
)
5548 error ("got %d template parameters for %q#D",
5549 TREE_VEC_LENGTH (a
), decl
);
5551 error ("got %d template parameters for %q#T",
5552 TREE_VEC_LENGTH (a
), current
);
5553 error (" but %d required", TREE_VEC_LENGTH (t
));
5554 /* Avoid crash in import_export_decl. */
5555 DECL_INTERFACE_KNOWN (decl
) = 1;
5556 return error_mark_node
;
5559 if (current
== decl
)
5561 else if (current
== NULL_TREE
)
5562 /* Can happen in erroneous input. */
5565 current
= get_containing_scope (current
);
5568 /* Check that the parms are used in the appropriate qualifying scopes
5569 in the declarator. */
5570 if (!comp_template_args
5572 TI_ARGS (get_template_info (DECL_TEMPLATE_RESULT (tmpl
)))))
5574 error ("template arguments to %qD do not match original "
5575 "template %qD", decl
, DECL_TEMPLATE_RESULT (tmpl
));
5576 if (!uses_template_parms (TI_ARGS (tinfo
)))
5577 inform (input_location
, "use %<template<>%> for"
5578 " an explicit specialization");
5579 /* Avoid crash in import_export_decl. */
5580 DECL_INTERFACE_KNOWN (decl
) = 1;
5581 return error_mark_node
;
5585 DECL_TEMPLATE_RESULT (tmpl
) = decl
;
5586 TREE_TYPE (tmpl
) = TREE_TYPE (decl
);
5588 /* Push template declarations for global functions and types. Note
5589 that we do not try to push a global template friend declared in a
5590 template class; such a thing may well depend on the template
5591 parameters of the class. */
5592 if (new_template_p
&& !ctx
5593 && !(is_friend
&& template_class_depth (current_class_type
) > 0))
5595 tmpl
= pushdecl_namespace_level (tmpl
, is_friend
);
5596 if (tmpl
== error_mark_node
)
5597 return error_mark_node
;
5599 /* Hide template friend classes that haven't been declared yet. */
5600 if (is_friend
&& TREE_CODE (decl
) == TYPE_DECL
)
5602 DECL_ANTICIPATED (tmpl
) = 1;
5603 DECL_FRIEND_P (tmpl
) = 1;
5609 tree parms
= DECL_TEMPLATE_PARMS (tmpl
);
5611 DECL_PRIMARY_TEMPLATE (tmpl
) = tmpl
;
5613 /* Give template template parms a DECL_CONTEXT of the template
5614 for which they are a parameter. */
5615 parms
= INNERMOST_TEMPLATE_PARMS (parms
);
5616 for (int i
= TREE_VEC_LENGTH (parms
) - 1; i
>= 0; --i
)
5618 tree parm
= TREE_VALUE (TREE_VEC_ELT (parms
, i
));
5619 if (TREE_CODE (parm
) == TEMPLATE_DECL
)
5620 DECL_CONTEXT (parm
) = tmpl
;
5623 if (TREE_CODE (decl
) == TYPE_DECL
5624 && TYPE_DECL_ALIAS_P (decl
)
5625 && complex_alias_template_p (tmpl
))
5626 TEMPLATE_DECL_COMPLEX_ALIAS_P (tmpl
) = true;
5629 /* The DECL_TI_ARGS of DECL contains full set of arguments referring
5630 back to its most general template. If TMPL is a specialization,
5631 ARGS may only have the innermost set of arguments. Add the missing
5632 argument levels if necessary. */
5633 if (DECL_TEMPLATE_INFO (tmpl
))
5634 args
= add_outermost_template_args (DECL_TI_ARGS (tmpl
), args
);
5636 info
= build_template_info (tmpl
, args
);
5638 if (DECL_IMPLICIT_TYPEDEF_P (decl
))
5639 SET_TYPE_TEMPLATE_INFO (TREE_TYPE (tmpl
), info
);
5643 retrofit_lang_decl (decl
);
5644 if (DECL_LANG_SPECIFIC (decl
))
5645 DECL_TEMPLATE_INFO (decl
) = info
;
5648 if (flag_implicit_templates
5650 && TREE_PUBLIC (decl
)
5651 && VAR_OR_FUNCTION_DECL_P (decl
))
5652 /* Set DECL_COMDAT on template instantiations; if we force
5653 them to be emitted by explicit instantiation or -frepo,
5654 mark_needed will tell cgraph to do the right thing. */
5655 DECL_COMDAT (decl
) = true;
5657 return DECL_TEMPLATE_RESULT (tmpl
);
5661 push_template_decl (tree decl
)
5663 return push_template_decl_real (decl
, false);
5666 /* FN is an inheriting constructor that inherits from the constructor
5667 template INHERITED; turn FN into a constructor template with a matching
5671 add_inherited_template_parms (tree fn
, tree inherited
)
5674 = INNERMOST_TEMPLATE_PARMS (DECL_TEMPLATE_PARMS (inherited
));
5675 inner_parms
= copy_node (inner_parms
);
5677 = tree_cons (size_int (processing_template_decl
+ 1),
5678 inner_parms
, current_template_parms
);
5679 tree tmpl
= build_template_decl (fn
, parms
, /*member*/true);
5680 tree args
= template_parms_to_args (parms
);
5681 DECL_TEMPLATE_INFO (fn
) = build_template_info (tmpl
, args
);
5682 TREE_TYPE (tmpl
) = TREE_TYPE (fn
);
5683 DECL_TEMPLATE_RESULT (tmpl
) = fn
;
5684 DECL_ARTIFICIAL (tmpl
) = true;
5685 DECL_PRIMARY_TEMPLATE (tmpl
) = tmpl
;
5689 /* Called when a class template TYPE is redeclared with the indicated
5690 template PARMS, e.g.:
5692 template <class T> struct S;
5693 template <class T> struct S {}; */
5696 redeclare_class_template (tree type
, tree parms
, tree cons
)
5702 if (!TYPE_TEMPLATE_INFO (type
))
5704 error ("%qT is not a template type", type
);
5708 tmpl
= TYPE_TI_TEMPLATE (type
);
5709 if (!PRIMARY_TEMPLATE_P (tmpl
))
5710 /* The type is nested in some template class. Nothing to worry
5711 about here; there are no new template parameters for the nested
5717 error ("template specifiers not specified in declaration of %qD",
5722 parms
= INNERMOST_TEMPLATE_PARMS (parms
);
5723 tmpl_parms
= DECL_INNERMOST_TEMPLATE_PARMS (tmpl
);
5725 if (TREE_VEC_LENGTH (parms
) != TREE_VEC_LENGTH (tmpl_parms
))
5727 error_n (input_location
, TREE_VEC_LENGTH (parms
),
5728 "redeclared with %d template parameter",
5729 "redeclared with %d template parameters",
5730 TREE_VEC_LENGTH (parms
));
5731 inform_n (DECL_SOURCE_LOCATION (tmpl
), TREE_VEC_LENGTH (tmpl_parms
),
5732 "previous declaration %qD used %d template parameter",
5733 "previous declaration %qD used %d template parameters",
5734 tmpl
, TREE_VEC_LENGTH (tmpl_parms
));
5738 for (i
= 0; i
< TREE_VEC_LENGTH (tmpl_parms
); ++i
)
5745 if (TREE_VEC_ELT (tmpl_parms
, i
) == error_mark_node
5746 || TREE_VEC_ELT (parms
, i
) == error_mark_node
)
5749 tmpl_parm
= TREE_VALUE (TREE_VEC_ELT (tmpl_parms
, i
));
5750 if (error_operand_p (tmpl_parm
))
5753 parm
= TREE_VALUE (TREE_VEC_ELT (parms
, i
));
5754 tmpl_default
= TREE_PURPOSE (TREE_VEC_ELT (tmpl_parms
, i
));
5755 parm_default
= TREE_PURPOSE (TREE_VEC_ELT (parms
, i
));
5757 /* TMPL_PARM and PARM can be either TYPE_DECL, PARM_DECL, or
5759 if (TREE_CODE (tmpl_parm
) != TREE_CODE (parm
)
5760 || (TREE_CODE (tmpl_parm
) != TYPE_DECL
5761 && !same_type_p (TREE_TYPE (tmpl_parm
), TREE_TYPE (parm
)))
5762 || (TREE_CODE (tmpl_parm
) != PARM_DECL
5763 && (TEMPLATE_TYPE_PARAMETER_PACK (TREE_TYPE (tmpl_parm
))
5764 != TEMPLATE_TYPE_PARAMETER_PACK (TREE_TYPE (parm
))))
5765 || (TREE_CODE (tmpl_parm
) == PARM_DECL
5766 && (TEMPLATE_PARM_PARAMETER_PACK (DECL_INITIAL (tmpl_parm
))
5767 != TEMPLATE_PARM_PARAMETER_PACK (DECL_INITIAL (parm
)))))
5769 error ("template parameter %q+#D", tmpl_parm
);
5770 error ("redeclared here as %q#D", parm
);
5774 if (tmpl_default
!= NULL_TREE
&& parm_default
!= NULL_TREE
)
5776 /* We have in [temp.param]:
5778 A template-parameter may not be given default arguments
5779 by two different declarations in the same scope. */
5780 error_at (input_location
, "redefinition of default argument for %q#D", parm
);
5781 inform (DECL_SOURCE_LOCATION (tmpl_parm
),
5782 "original definition appeared here");
5786 if (parm_default
!= NULL_TREE
)
5787 /* Update the previous template parameters (which are the ones
5788 that will really count) with the new default value. */
5789 TREE_PURPOSE (TREE_VEC_ELT (tmpl_parms
, i
)) = parm_default
;
5790 else if (tmpl_default
!= NULL_TREE
)
5791 /* Update the new parameters, too; they'll be used as the
5792 parameters for any members. */
5793 TREE_PURPOSE (TREE_VEC_ELT (parms
, i
)) = tmpl_default
;
5795 /* Give each template template parm in this redeclaration a
5796 DECL_CONTEXT of the template for which they are a parameter. */
5797 if (TREE_CODE (parm
) == TEMPLATE_DECL
)
5799 gcc_assert (DECL_CONTEXT (parm
) == NULL_TREE
);
5800 DECL_CONTEXT (parm
) = tmpl
;
5803 if (TREE_CODE (parm
) == TYPE_DECL
)
5804 TEMPLATE_TYPE_PARM_FOR_CLASS (TREE_TYPE (parm
)) = true;
5807 // Cannot redeclare a class template with a different set of constraints.
5808 if (!equivalent_constraints (get_constraints (tmpl
), cons
))
5810 error_at (input_location
, "redeclaration %q#D with different "
5811 "constraints", tmpl
);
5812 inform (DECL_SOURCE_LOCATION (tmpl
),
5813 "original declaration appeared here");
5819 /* The actual substitution part of instantiate_non_dependent_expr_sfinae,
5820 to be used when the caller has already checked
5821 (processing_template_decl
5822 && !instantiation_dependent_expression_p (expr)
5823 && potential_constant_expression (expr))
5824 and cleared processing_template_decl. */
5827 instantiate_non_dependent_expr_internal (tree expr
, tsubst_flags_t complain
)
5829 return tsubst_copy_and_build (expr
,
5832 /*in_decl=*/NULL_TREE
,
5833 /*function_p=*/false,
5834 /*integral_constant_expression_p=*/true);
5837 /* Simplify EXPR if it is a non-dependent expression. Returns the
5838 (possibly simplified) expression. */
5841 instantiate_non_dependent_expr_sfinae (tree expr
, tsubst_flags_t complain
)
5843 if (expr
== NULL_TREE
)
5846 /* If we're in a template, but EXPR isn't value dependent, simplify
5847 it. We're supposed to treat:
5849 template <typename T> void f(T[1 + 1]);
5850 template <typename T> void f(T[2]);
5852 as two declarations of the same function, for example. */
5853 if (processing_template_decl
5854 && is_nondependent_constant_expression (expr
))
5856 processing_template_decl_sentinel s
;
5857 expr
= instantiate_non_dependent_expr_internal (expr
, complain
);
5863 instantiate_non_dependent_expr (tree expr
)
5865 return instantiate_non_dependent_expr_sfinae (expr
, tf_error
);
5868 /* Like instantiate_non_dependent_expr, but return NULL_TREE rather than
5869 an uninstantiated expression. */
5872 instantiate_non_dependent_or_null (tree expr
)
5874 if (expr
== NULL_TREE
)
5876 if (processing_template_decl
)
5878 if (!is_nondependent_constant_expression (expr
))
5882 processing_template_decl_sentinel s
;
5883 expr
= instantiate_non_dependent_expr_internal (expr
, tf_error
);
5889 /* True iff T is a specialization of a variable template. */
5892 variable_template_specialization_p (tree t
)
5894 if (!VAR_P (t
) || !DECL_LANG_SPECIFIC (t
) || !DECL_TEMPLATE_INFO (t
))
5896 tree tmpl
= DECL_TI_TEMPLATE (t
);
5897 return variable_template_p (tmpl
);
5900 /* Return TRUE iff T is a type alias, a TEMPLATE_DECL for an alias
5901 template declaration, or a TYPE_DECL for an alias declaration. */
5904 alias_type_or_template_p (tree t
)
5908 return ((TREE_CODE (t
) == TYPE_DECL
&& TYPE_DECL_ALIAS_P (t
))
5911 && TYPE_DECL_ALIAS_P (TYPE_NAME (t
)))
5912 || DECL_ALIAS_TEMPLATE_P (t
));
5915 /* Return TRUE iff T is a specialization of an alias template. */
5918 alias_template_specialization_p (const_tree t
)
5920 /* It's an alias template specialization if it's an alias and its
5921 TYPE_NAME is a specialization of a primary template. */
5922 if (TYPE_ALIAS_P (t
))
5923 if (tree tinfo
= TYPE_ALIAS_TEMPLATE_INFO (t
))
5924 return PRIMARY_TEMPLATE_P (TI_TEMPLATE (tinfo
));
5929 /* An alias template is complex from a SFINAE perspective if a template-id
5930 using that alias can be ill-formed when the expansion is not, as with
5931 the void_t template. We determine this by checking whether the
5932 expansion for the alias template uses all its template parameters. */
5934 struct uses_all_template_parms_data
5941 uses_all_template_parms_r (tree t
, void *data_
)
5943 struct uses_all_template_parms_data
&data
5944 = *(struct uses_all_template_parms_data
*)data_
;
5945 tree idx
= get_template_parm_index (t
);
5947 if (TEMPLATE_PARM_LEVEL (idx
) == data
.level
)
5948 data
.seen
[TEMPLATE_PARM_IDX (idx
)] = true;
5953 complex_alias_template_p (const_tree tmpl
)
5955 struct uses_all_template_parms_data data
;
5956 tree pat
= DECL_ORIGINAL_TYPE (DECL_TEMPLATE_RESULT (tmpl
));
5957 tree parms
= DECL_TEMPLATE_PARMS (tmpl
);
5958 data
.level
= TMPL_PARMS_DEPTH (parms
);
5959 int len
= TREE_VEC_LENGTH (INNERMOST_TEMPLATE_PARMS (parms
));
5960 data
.seen
= XALLOCAVEC (bool, len
);
5961 for (int i
= 0; i
< len
; ++i
)
5962 data
.seen
[i
] = false;
5964 for_each_template_parm (pat
, uses_all_template_parms_r
, &data
, NULL
, true);
5965 for (int i
= 0; i
< len
; ++i
)
5971 /* Return TRUE iff T is a specialization of a complex alias template with
5972 dependent template-arguments. */
5975 dependent_alias_template_spec_p (const_tree t
)
5977 if (!alias_template_specialization_p (t
))
5980 tree tinfo
= TYPE_ALIAS_TEMPLATE_INFO (t
);
5981 if (!TEMPLATE_DECL_COMPLEX_ALIAS_P (TI_TEMPLATE (tinfo
)))
5984 tree args
= INNERMOST_TEMPLATE_ARGS (TI_ARGS (tinfo
));
5985 if (!any_dependent_template_arguments_p (args
))
5991 /* Return the number of innermost template parameters in TMPL. */
5994 num_innermost_template_parms (tree tmpl
)
5996 tree parms
= INNERMOST_TEMPLATE_PARMS (DECL_TEMPLATE_PARMS (tmpl
));
5997 return TREE_VEC_LENGTH (parms
);
6000 /* Return either TMPL or another template that it is equivalent to under DR
6001 1286: An alias that just changes the name of a template is equivalent to
6002 the other template. */
6005 get_underlying_template (tree tmpl
)
6007 gcc_assert (TREE_CODE (tmpl
) == TEMPLATE_DECL
);
6008 while (DECL_ALIAS_TEMPLATE_P (tmpl
))
6010 /* Determine if the alias is equivalent to an underlying template. */
6011 tree orig_type
= DECL_ORIGINAL_TYPE (DECL_TEMPLATE_RESULT (tmpl
));
6012 tree tinfo
= TYPE_TEMPLATE_INFO_MAYBE_ALIAS (orig_type
);
6016 tree underlying
= TI_TEMPLATE (tinfo
);
6017 if (!PRIMARY_TEMPLATE_P (underlying
)
6018 || (num_innermost_template_parms (tmpl
)
6019 != num_innermost_template_parms (underlying
)))
6022 tree alias_args
= INNERMOST_TEMPLATE_ARGS
6023 (template_parms_to_args (DECL_TEMPLATE_PARMS (tmpl
)));
6024 if (!comp_template_args (TI_ARGS (tinfo
), alias_args
))
6027 /* Alias is equivalent. Strip it and repeat. */
6034 /* Subroutine of convert_nontype_argument. Converts EXPR to TYPE, which
6035 must be a reference-to-function or a pointer-to-function type, as specified
6036 in [temp.arg.nontype]: disambiguate EXPR if it is an overload set,
6037 and check that the resulting function has external linkage. */
6040 convert_nontype_argument_function (tree type
, tree expr
,
6041 tsubst_flags_t complain
)
6045 linkage_kind linkage
;
6047 fn
= instantiate_type (type
, fns
, tf_none
);
6048 if (fn
== error_mark_node
)
6049 return error_mark_node
;
6051 if (value_dependent_expression_p (fn
))
6054 fn_no_ptr
= strip_fnptr_conv (fn
);
6055 if (TREE_CODE (fn_no_ptr
) == ADDR_EXPR
)
6056 fn_no_ptr
= TREE_OPERAND (fn_no_ptr
, 0);
6057 if (BASELINK_P (fn_no_ptr
))
6058 fn_no_ptr
= BASELINK_FUNCTIONS (fn_no_ptr
);
6060 /* [temp.arg.nontype]/1
6062 A template-argument for a non-type, non-template template-parameter
6065 -- the address of an object or function with external [C++11: or
6066 internal] linkage. */
6068 if (TREE_CODE (fn_no_ptr
) != FUNCTION_DECL
)
6070 if (complain
& tf_error
)
6072 error ("%qE is not a valid template argument for type %qT",
6074 if (TYPE_PTR_P (type
))
6075 inform (input_location
, "it must be the address of a function "
6076 "with external linkage");
6078 inform (input_location
, "it must be the name of a function with "
6079 "external linkage");
6084 linkage
= decl_linkage (fn_no_ptr
);
6085 if (cxx_dialect
>= cxx11
? linkage
== lk_none
: linkage
!= lk_external
)
6087 if (complain
& tf_error
)
6089 if (cxx_dialect
>= cxx11
)
6090 error ("%qE is not a valid template argument for type %qT "
6091 "because %qD has no linkage",
6092 expr
, type
, fn_no_ptr
);
6094 error ("%qE is not a valid template argument for type %qT "
6095 "because %qD does not have external linkage",
6096 expr
, type
, fn_no_ptr
);
6102 if (TREE_CODE (type
) == REFERENCE_TYPE
)
6103 fn
= build_address (fn
);
6104 if (!same_type_ignoring_top_level_qualifiers_p (type
, TREE_TYPE (fn
)))
6105 fn
= build_nop (type
, fn
);
6110 /* Subroutine of convert_nontype_argument.
6111 Check if EXPR of type TYPE is a valid pointer-to-member constant.
6112 Emit an error otherwise. */
6115 check_valid_ptrmem_cst_expr (tree type
, tree expr
,
6116 tsubst_flags_t complain
)
6118 location_t loc
= EXPR_LOC_OR_LOC (expr
, input_location
);
6119 tree orig_expr
= expr
;
6121 if (null_ptr_cst_p (expr
))
6123 if (TREE_CODE (expr
) == PTRMEM_CST
6124 && same_type_p (TYPE_PTRMEM_CLASS_TYPE (type
),
6125 PTRMEM_CST_CLASS (expr
)))
6127 if (cxx_dialect
>= cxx11
&& null_member_pointer_value_p (expr
))
6129 if (processing_template_decl
6130 && TREE_CODE (expr
) == ADDR_EXPR
6131 && TREE_CODE (TREE_OPERAND (expr
, 0)) == OFFSET_REF
)
6133 if (complain
& tf_error
)
6135 error_at (loc
, "%qE is not a valid template argument for type %qT",
6137 if (TREE_CODE (expr
) != PTRMEM_CST
)
6138 inform (loc
, "it must be a pointer-to-member of the form %<&X::Y%>");
6140 inform (loc
, "because it is a member of %qT", PTRMEM_CST_CLASS (expr
));
6145 /* Returns TRUE iff the address of OP is value-dependent.
6147 14.6.2.4 [temp.dep.temp]:
6148 A non-integral non-type template-argument is dependent if its type is
6149 dependent or it has either of the following forms
6152 and contains a nested-name-specifier which specifies a class-name that
6153 names a dependent type.
6155 We generalize this to just say that the address of a member of a
6156 dependent class is value-dependent; the above doesn't cover the
6157 address of a static data member named with an unqualified-id. */
6160 has_value_dependent_address (tree op
)
6162 /* We could use get_inner_reference here, but there's no need;
6163 this is only relevant for template non-type arguments, which
6164 can only be expressed as &id-expression. */
6167 tree ctx
= CP_DECL_CONTEXT (op
);
6168 if (TYPE_P (ctx
) && dependent_type_p (ctx
))
6175 /* The next set of functions are used for providing helpful explanatory
6176 diagnostics for failed overload resolution. Their messages should be
6177 indented by two spaces for consistency with the messages in
6181 unify_success (bool /*explain_p*/)
6186 /* Other failure functions should call this one, to provide a single function
6187 for setting a breakpoint on. */
6190 unify_invalid (bool /*explain_p*/)
6196 unify_parameter_deduction_failure (bool explain_p
, tree parm
)
6199 inform (input_location
,
6200 " couldn't deduce template parameter %qD", parm
);
6201 return unify_invalid (explain_p
);
6205 unify_cv_qual_mismatch (bool explain_p
, tree parm
, tree arg
)
6208 inform (input_location
,
6209 " types %qT and %qT have incompatible cv-qualifiers",
6211 return unify_invalid (explain_p
);
6215 unify_type_mismatch (bool explain_p
, tree parm
, tree arg
)
6218 inform (input_location
, " mismatched types %qT and %qT", parm
, arg
);
6219 return unify_invalid (explain_p
);
6223 unify_parameter_pack_mismatch (bool explain_p
, tree parm
, tree arg
)
6226 inform (input_location
,
6227 " template parameter %qD is not a parameter pack, but "
6230 return unify_invalid (explain_p
);
6234 unify_ptrmem_cst_mismatch (bool explain_p
, tree parm
, tree arg
)
6237 inform (input_location
,
6238 " template argument %qE does not match "
6239 "pointer-to-member constant %qE",
6241 return unify_invalid (explain_p
);
6245 unify_expression_unequal (bool explain_p
, tree parm
, tree arg
)
6248 inform (input_location
, " %qE is not equivalent to %qE", parm
, arg
);
6249 return unify_invalid (explain_p
);
6253 unify_parameter_pack_inconsistent (bool explain_p
, tree old_arg
, tree new_arg
)
6256 inform (input_location
,
6257 " inconsistent parameter pack deduction with %qT and %qT",
6259 return unify_invalid (explain_p
);
6263 unify_inconsistency (bool explain_p
, tree parm
, tree first
, tree second
)
6268 inform (input_location
,
6269 " deduced conflicting types for parameter %qT (%qT and %qT)",
6270 parm
, first
, second
);
6272 inform (input_location
,
6273 " deduced conflicting values for non-type parameter "
6274 "%qE (%qE and %qE)", parm
, first
, second
);
6276 return unify_invalid (explain_p
);
6280 unify_vla_arg (bool explain_p
, tree arg
)
6283 inform (input_location
,
6284 " variable-sized array type %qT is not "
6285 "a valid template argument",
6287 return unify_invalid (explain_p
);
6291 unify_method_type_error (bool explain_p
, tree arg
)
6294 inform (input_location
,
6295 " member function type %qT is not a valid template argument",
6297 return unify_invalid (explain_p
);
6301 unify_arity (bool explain_p
, int have
, int wanted
, bool least_p
= false)
6306 inform_n (input_location
, wanted
,
6307 " candidate expects at least %d argument, %d provided",
6308 " candidate expects at least %d arguments, %d provided",
6311 inform_n (input_location
, wanted
,
6312 " candidate expects %d argument, %d provided",
6313 " candidate expects %d arguments, %d provided",
6316 return unify_invalid (explain_p
);
6320 unify_too_many_arguments (bool explain_p
, int have
, int wanted
)
6322 return unify_arity (explain_p
, have
, wanted
);
6326 unify_too_few_arguments (bool explain_p
, int have
, int wanted
,
6327 bool least_p
= false)
6329 return unify_arity (explain_p
, have
, wanted
, least_p
);
6333 unify_arg_conversion (bool explain_p
, tree to_type
,
6334 tree from_type
, tree arg
)
6337 inform (EXPR_LOC_OR_LOC (arg
, input_location
),
6338 " cannot convert %qE (type %qT) to type %qT",
6339 arg
, from_type
, to_type
);
6340 return unify_invalid (explain_p
);
6344 unify_no_common_base (bool explain_p
, enum template_base_result r
,
6345 tree parm
, tree arg
)
6350 case tbr_ambiguous_baseclass
:
6351 inform (input_location
, " %qT is an ambiguous base class of %qT",
6355 inform (input_location
, " %qT is not derived from %qT", arg
, parm
);
6358 return unify_invalid (explain_p
);
6362 unify_inconsistent_template_template_parameters (bool explain_p
)
6365 inform (input_location
,
6366 " template parameters of a template template argument are "
6367 "inconsistent with other deduced template arguments");
6368 return unify_invalid (explain_p
);
6372 unify_template_deduction_failure (bool explain_p
, tree parm
, tree arg
)
6375 inform (input_location
,
6376 " can't deduce a template for %qT from non-template type %qT",
6378 return unify_invalid (explain_p
);
6382 unify_template_argument_mismatch (bool explain_p
, tree parm
, tree arg
)
6385 inform (input_location
,
6386 " template argument %qE does not match %qE", arg
, parm
);
6387 return unify_invalid (explain_p
);
6390 /* Attempt to convert the non-type template parameter EXPR to the
6391 indicated TYPE. If the conversion is successful, return the
6392 converted value. If the conversion is unsuccessful, return
6393 NULL_TREE if we issued an error message, or error_mark_node if we
6394 did not. We issue error messages for out-and-out bad template
6395 parameters, but not simply because the conversion failed, since we
6396 might be just trying to do argument deduction. Both TYPE and EXPR
6397 must be non-dependent.
6399 The conversion follows the special rules described in
6400 [temp.arg.nontype], and it is much more strict than an implicit
6403 This function is called twice for each template argument (see
6404 lookup_template_class for a more accurate description of this
6405 problem). This means that we need to handle expressions which
6406 are not valid in a C++ source, but can be created from the
6407 first call (for instance, casts to perform conversions). These
6408 hacks can go away after we fix the double coercion problem. */
6411 convert_nontype_argument (tree type
, tree expr
, tsubst_flags_t complain
)
6414 location_t loc
= EXPR_LOC_OR_LOC (expr
, input_location
);
6415 tree orig_expr
= expr
;
6417 /* Detect immediately string literals as invalid non-type argument.
6418 This special-case is not needed for correctness (we would easily
6419 catch this later), but only to provide better diagnostic for this
6420 common user mistake. As suggested by DR 100, we do not mention
6421 linkage issues in the diagnostic as this is not the point. */
6422 /* FIXME we're making this OK. */
6423 if (TREE_CODE (expr
) == STRING_CST
)
6425 if (complain
& tf_error
)
6426 error ("%qE is not a valid template argument for type %qT "
6427 "because string literals can never be used in this context",
6432 /* Add the ADDR_EXPR now for the benefit of
6433 value_dependent_expression_p. */
6434 if (TYPE_PTROBV_P (type
)
6435 && TREE_CODE (TREE_TYPE (expr
)) == ARRAY_TYPE
)
6437 expr
= decay_conversion (expr
, complain
);
6438 if (expr
== error_mark_node
)
6439 return error_mark_node
;
6442 /* If we are in a template, EXPR may be non-dependent, but still
6443 have a syntactic, rather than semantic, form. For example, EXPR
6444 might be a SCOPE_REF, rather than the VAR_DECL to which the
6445 SCOPE_REF refers. Preserving the qualifying scope is necessary
6446 so that access checking can be performed when the template is
6447 instantiated -- but here we need the resolved form so that we can
6448 convert the argument. */
6449 bool non_dep
= false;
6450 if (TYPE_REF_OBJ_P (type
)
6451 && has_value_dependent_address (expr
))
6452 /* If we want the address and it's value-dependent, don't fold. */;
6453 else if (processing_template_decl
6454 && is_nondependent_constant_expression (expr
))
6456 if (error_operand_p (expr
))
6457 return error_mark_node
;
6458 expr_type
= TREE_TYPE (expr
);
6460 /* If the argument is non-dependent, perform any conversions in
6461 non-dependent context as well. */
6462 processing_template_decl_sentinel
s (non_dep
);
6464 expr
= instantiate_non_dependent_expr_internal (expr
, complain
);
6466 if (value_dependent_expression_p (expr
))
6467 expr
= canonicalize_expr_argument (expr
, complain
);
6469 /* 14.3.2/5: The null pointer{,-to-member} conversion is applied
6470 to a non-type argument of "nullptr". */
6471 if (NULLPTR_TYPE_P (expr_type
) && TYPE_PTR_OR_PTRMEM_P (type
))
6472 expr
= fold_simple (convert (type
, expr
));
6474 /* In C++11, integral or enumeration non-type template arguments can be
6475 arbitrary constant expressions. Pointer and pointer to
6476 member arguments can be general constant expressions that evaluate
6477 to a null value, but otherwise still need to be of a specific form. */
6478 if (cxx_dialect
>= cxx11
)
6480 if (TREE_CODE (expr
) == PTRMEM_CST
)
6481 /* A PTRMEM_CST is already constant, and a valid template
6482 argument for a parameter of pointer to member type, we just want
6483 to leave it in that form rather than lower it to a
6485 else if (INTEGRAL_OR_ENUMERATION_TYPE_P (type
)
6486 || cxx_dialect
>= cxx17
)
6488 /* C++17: A template-argument for a non-type template-parameter shall
6489 be a converted constant expression (8.20) of the type of the
6490 template-parameter. */
6491 expr
= build_converted_constant_expr (type
, expr
, complain
);
6492 if (expr
== error_mark_node
)
6493 return error_mark_node
;
6494 expr
= maybe_constant_value (expr
);
6495 expr
= convert_from_reference (expr
);
6497 else if (TYPE_PTR_OR_PTRMEM_P (type
))
6499 tree folded
= maybe_constant_value (expr
);
6500 if (TYPE_PTR_P (type
) ? integer_zerop (folded
)
6501 : null_member_pointer_value_p (folded
))
6506 if (TREE_CODE (type
) == REFERENCE_TYPE
)
6507 expr
= mark_lvalue_use (expr
);
6509 expr
= mark_rvalue_use (expr
);
6511 /* HACK: Due to double coercion, we can get a
6512 NOP_EXPR<REFERENCE_TYPE>(ADDR_EXPR<POINTER_TYPE> (arg)) here,
6513 which is the tree that we built on the first call (see
6514 below when coercing to reference to object or to reference to
6515 function). We just strip everything and get to the arg.
6516 See g++.old-deja/g++.oliva/template4.C and g++.dg/template/nontype9.C
6518 if (TYPE_REF_OBJ_P (type
) || TYPE_REFFN_P (type
))
6520 tree probe_type
, probe
= expr
;
6521 if (REFERENCE_REF_P (probe
))
6522 probe
= TREE_OPERAND (probe
, 0);
6523 probe_type
= TREE_TYPE (probe
);
6524 if (TREE_CODE (probe
) == NOP_EXPR
)
6526 /* ??? Maybe we could use convert_from_reference here, but we
6527 would need to relax its constraints because the NOP_EXPR
6528 could actually change the type to something more cv-qualified,
6529 and this is not folded by convert_from_reference. */
6530 tree addr
= TREE_OPERAND (probe
, 0);
6531 if (TREE_CODE (probe_type
) == REFERENCE_TYPE
6532 && TREE_CODE (addr
) == ADDR_EXPR
6533 && TYPE_PTR_P (TREE_TYPE (addr
))
6534 && (same_type_ignoring_top_level_qualifiers_p
6535 (TREE_TYPE (probe_type
),
6536 TREE_TYPE (TREE_TYPE (addr
)))))
6538 expr
= TREE_OPERAND (addr
, 0);
6539 expr_type
= TREE_TYPE (probe_type
);
6544 /* [temp.arg.nontype]/5, bullet 1
6546 For a non-type template-parameter of integral or enumeration type,
6547 integral promotions (_conv.prom_) and integral conversions
6548 (_conv.integral_) are applied. */
6549 if (INTEGRAL_OR_ENUMERATION_TYPE_P (type
))
6551 if (cxx_dialect
< cxx11
)
6553 tree t
= build_converted_constant_expr (type
, expr
, complain
);
6554 t
= maybe_constant_value (t
);
6555 if (t
!= error_mark_node
)
6559 if (!same_type_ignoring_top_level_qualifiers_p (type
, TREE_TYPE (expr
)))
6560 return error_mark_node
;
6562 /* Notice that there are constant expressions like '4 % 0' which
6563 do not fold into integer constants. */
6564 if (TREE_CODE (expr
) != INTEGER_CST
6565 && !value_dependent_expression_p (expr
))
6567 if (complain
& tf_error
)
6569 int errs
= errorcount
, warns
= warningcount
+ werrorcount
;
6570 if (!require_potential_constant_expression (expr
))
6571 expr
= error_mark_node
;
6573 expr
= cxx_constant_value (expr
);
6574 if (errorcount
> errs
|| warningcount
+ werrorcount
> warns
)
6575 inform (loc
, "in template argument for type %qT ", type
);
6576 if (expr
== error_mark_node
)
6578 /* else cxx_constant_value complained but gave us
6579 a real constant, so go ahead. */
6580 gcc_assert (TREE_CODE (expr
) == INTEGER_CST
);
6586 /* Avoid typedef problems. */
6587 if (TREE_TYPE (expr
) != type
)
6588 expr
= fold_convert (type
, expr
);
6590 /* [temp.arg.nontype]/5, bullet 2
6592 For a non-type template-parameter of type pointer to object,
6593 qualification conversions (_conv.qual_) and the array-to-pointer
6594 conversion (_conv.array_) are applied. */
6595 else if (TYPE_PTROBV_P (type
))
6597 tree decayed
= expr
;
6599 /* Look through any NOP_EXPRs around an ADDR_EXPR, whether they come from
6600 decay_conversion or an explicit cast. If it's a problematic cast,
6601 we'll complain about it below. */
6602 if (TREE_CODE (expr
) == NOP_EXPR
)
6606 if (TREE_CODE (probe
) == ADDR_EXPR
6607 && TYPE_PTR_P (TREE_TYPE (probe
)))
6610 expr_type
= TREE_TYPE (expr
);
6614 /* [temp.arg.nontype]/1 (TC1 version, DR 49):
6616 A template-argument for a non-type, non-template template-parameter
6617 shall be one of: [...]
6619 -- the name of a non-type template-parameter;
6620 -- the address of an object or function with external linkage, [...]
6621 expressed as "& id-expression" where the & is optional if the name
6622 refers to a function or array, or if the corresponding
6623 template-parameter is a reference.
6625 Here, we do not care about functions, as they are invalid anyway
6626 for a parameter of type pointer-to-object. */
6628 if (value_dependent_expression_p (expr
))
6629 /* Non-type template parameters are OK. */
6631 else if (cxx_dialect
>= cxx11
&& integer_zerop (expr
))
6632 /* Null pointer values are OK in C++11. */;
6633 else if (TREE_CODE (expr
) != ADDR_EXPR
)
6637 if (complain
& tf_error
)
6638 error ("%qD is not a valid template argument "
6639 "because %qD is a variable, not the address of "
6640 "a variable", orig_expr
, expr
);
6643 if (POINTER_TYPE_P (expr_type
))
6645 if (complain
& tf_error
)
6646 error ("%qE is not a valid template argument for %qT "
6647 "because it is not the address of a variable",
6651 /* Other values, like integer constants, might be valid
6652 non-type arguments of some other type. */
6653 return error_mark_node
;
6657 tree decl
= TREE_OPERAND (expr
, 0);
6661 if (complain
& tf_error
)
6662 error ("%qE is not a valid template argument of type %qT "
6663 "because %qE is not a variable", orig_expr
, type
, decl
);
6666 else if (cxx_dialect
< cxx11
&& !DECL_EXTERNAL_LINKAGE_P (decl
))
6668 if (complain
& tf_error
)
6669 error ("%qE is not a valid template argument of type %qT "
6670 "because %qD does not have external linkage",
6671 orig_expr
, type
, decl
);
6674 else if ((cxx_dialect
>= cxx11
&& cxx_dialect
< cxx17
)
6675 && decl_linkage (decl
) == lk_none
)
6677 if (complain
& tf_error
)
6678 error ("%qE is not a valid template argument of type %qT "
6679 "because %qD has no linkage", orig_expr
, type
, decl
);
6682 /* C++17: For a non-type template-parameter of reference or pointer
6683 type, the value of the constant expression shall not refer to (or
6684 for a pointer type, shall not be the address of):
6685 * a subobject (4.5),
6686 * a temporary object (15.2),
6687 * a string literal (5.13.5),
6688 * the result of a typeid expression (8.2.8), or
6689 * a predefined __func__ variable (11.4.1). */
6690 else if (DECL_ARTIFICIAL (decl
))
6692 if (complain
& tf_error
)
6693 error ("the address of %qD is not a valid template argument",
6697 else if (!same_type_ignoring_top_level_qualifiers_p
6698 (strip_array_types (TREE_TYPE (type
)),
6699 strip_array_types (TREE_TYPE (decl
))))
6701 if (complain
& tf_error
)
6702 error ("the address of the %qT subobject of %qD is not a "
6703 "valid template argument", TREE_TYPE (type
), decl
);
6706 else if (!TREE_STATIC (decl
) && !DECL_EXTERNAL (decl
))
6708 if (complain
& tf_error
)
6709 error ("the address of %qD is not a valid template argument "
6710 "because it does not have static storage duration",
6718 expr
= perform_qualification_conversions (type
, expr
);
6719 if (expr
== error_mark_node
)
6720 return error_mark_node
;
6722 /* [temp.arg.nontype]/5, bullet 3
6724 For a non-type template-parameter of type reference to object, no
6725 conversions apply. The type referred to by the reference may be more
6726 cv-qualified than the (otherwise identical) type of the
6727 template-argument. The template-parameter is bound directly to the
6728 template-argument, which must be an lvalue. */
6729 else if (TYPE_REF_OBJ_P (type
))
6731 if (!same_type_ignoring_top_level_qualifiers_p (TREE_TYPE (type
),
6733 return error_mark_node
;
6735 if (!at_least_as_qualified_p (TREE_TYPE (type
), expr_type
))
6737 if (complain
& tf_error
)
6738 error ("%qE is not a valid template argument for type %qT "
6739 "because of conflicts in cv-qualification", expr
, type
);
6743 if (!lvalue_p (expr
))
6745 if (complain
& tf_error
)
6746 error ("%qE is not a valid template argument for type %qT "
6747 "because it is not an lvalue", expr
, type
);
6751 /* [temp.arg.nontype]/1
6753 A template-argument for a non-type, non-template template-parameter
6754 shall be one of: [...]
6756 -- the address of an object or function with external linkage. */
6757 if (INDIRECT_REF_P (expr
)
6758 && TYPE_REF_OBJ_P (TREE_TYPE (TREE_OPERAND (expr
, 0))))
6760 expr
= TREE_OPERAND (expr
, 0);
6763 if (complain
& tf_error
)
6764 error ("%q#D is not a valid template argument for type %qT "
6765 "because a reference variable does not have a constant "
6766 "address", expr
, type
);
6771 if (TYPE_REF_OBJ_P (TREE_TYPE (expr
))
6772 && value_dependent_expression_p (expr
))
6773 /* OK, dependent reference. We don't want to ask whether a DECL is
6774 itself value-dependent, since what we want here is its address. */;
6779 if (complain
& tf_error
)
6780 error ("%qE is not a valid template argument for type %qT "
6781 "because it is not an object with linkage",
6786 /* DR 1155 allows internal linkage in C++11 and up. */
6787 linkage_kind linkage
= decl_linkage (expr
);
6788 if (linkage
< (cxx_dialect
>= cxx11
? lk_internal
: lk_external
))
6790 if (complain
& tf_error
)
6791 error ("%qE is not a valid template argument for type %qT "
6792 "because object %qD does not have linkage",
6797 expr
= build_address (expr
);
6800 if (!same_type_p (type
, TREE_TYPE (expr
)))
6801 expr
= build_nop (type
, expr
);
6803 /* [temp.arg.nontype]/5, bullet 4
6805 For a non-type template-parameter of type pointer to function, only
6806 the function-to-pointer conversion (_conv.func_) is applied. If the
6807 template-argument represents a set of overloaded functions (or a
6808 pointer to such), the matching function is selected from the set
6810 else if (TYPE_PTRFN_P (type
))
6812 /* If the argument is a template-id, we might not have enough
6813 context information to decay the pointer. */
6814 if (!type_unknown_p (expr_type
))
6816 expr
= decay_conversion (expr
, complain
);
6817 if (expr
== error_mark_node
)
6818 return error_mark_node
;
6821 if (cxx_dialect
>= cxx11
&& integer_zerop (expr
))
6822 /* Null pointer values are OK in C++11. */
6823 return perform_qualification_conversions (type
, expr
);
6825 expr
= convert_nontype_argument_function (type
, expr
, complain
);
6826 if (!expr
|| expr
== error_mark_node
)
6829 /* [temp.arg.nontype]/5, bullet 5
6831 For a non-type template-parameter of type reference to function, no
6832 conversions apply. If the template-argument represents a set of
6833 overloaded functions, the matching function is selected from the set
6835 else if (TYPE_REFFN_P (type
))
6837 if (TREE_CODE (expr
) == ADDR_EXPR
)
6839 if (complain
& tf_error
)
6841 error ("%qE is not a valid template argument for type %qT "
6842 "because it is a pointer", expr
, type
);
6843 inform (input_location
, "try using %qE instead",
6844 TREE_OPERAND (expr
, 0));
6849 expr
= convert_nontype_argument_function (type
, expr
, complain
);
6850 if (!expr
|| expr
== error_mark_node
)
6853 /* [temp.arg.nontype]/5, bullet 6
6855 For a non-type template-parameter of type pointer to member function,
6856 no conversions apply. If the template-argument represents a set of
6857 overloaded member functions, the matching member function is selected
6858 from the set (_over.over_). */
6859 else if (TYPE_PTRMEMFUNC_P (type
))
6861 expr
= instantiate_type (type
, expr
, tf_none
);
6862 if (expr
== error_mark_node
)
6863 return error_mark_node
;
6865 /* [temp.arg.nontype] bullet 1 says the pointer to member
6866 expression must be a pointer-to-member constant. */
6867 if (!value_dependent_expression_p (expr
)
6868 && !check_valid_ptrmem_cst_expr (type
, expr
, complain
))
6871 /* Repeated conversion can't deal with a conversion that turns PTRMEM_CST
6872 into a CONSTRUCTOR, so build up a new PTRMEM_CST instead. */
6873 if (fnptr_conv_p (type
, TREE_TYPE (expr
)))
6874 expr
= make_ptrmem_cst (type
, PTRMEM_CST_MEMBER (expr
));
6876 /* [temp.arg.nontype]/5, bullet 7
6878 For a non-type template-parameter of type pointer to data member,
6879 qualification conversions (_conv.qual_) are applied. */
6880 else if (TYPE_PTRDATAMEM_P (type
))
6882 /* [temp.arg.nontype] bullet 1 says the pointer to member
6883 expression must be a pointer-to-member constant. */
6884 if (!value_dependent_expression_p (expr
)
6885 && !check_valid_ptrmem_cst_expr (type
, expr
, complain
))
6888 expr
= perform_qualification_conversions (type
, expr
);
6889 if (expr
== error_mark_node
)
6892 else if (NULLPTR_TYPE_P (type
))
6894 if (!NULLPTR_TYPE_P (TREE_TYPE (expr
)))
6896 if (complain
& tf_error
)
6897 error ("%qE is not a valid template argument for type %qT "
6898 "because it is of type %qT", expr
, type
, TREE_TYPE (expr
));
6903 /* A template non-type parameter must be one of the above. */
6907 /* Sanity check: did we actually convert the argument to the
6909 gcc_assert (same_type_ignoring_top_level_qualifiers_p
6910 (type
, TREE_TYPE (expr
)));
6911 return convert_from_reference (expr
);
6914 /* Subroutine of coerce_template_template_parms, which returns 1 if
6915 PARM_PARM and ARG_PARM match using the rule for the template
6916 parameters of template template parameters. Both PARM and ARG are
6917 template parameters; the rest of the arguments are the same as for
6918 coerce_template_template_parms.
6921 coerce_template_template_parm (tree parm
,
6923 tsubst_flags_t complain
,
6927 if (arg
== NULL_TREE
|| error_operand_p (arg
)
6928 || parm
== NULL_TREE
|| error_operand_p (parm
))
6931 if (TREE_CODE (arg
) != TREE_CODE (parm
))
6934 switch (TREE_CODE (parm
))
6937 /* We encounter instantiations of templates like
6938 template <template <template <class> class> class TT>
6941 tree parmparm
= DECL_INNERMOST_TEMPLATE_PARMS (parm
);
6942 tree argparm
= DECL_INNERMOST_TEMPLATE_PARMS (arg
);
6944 if (!coerce_template_template_parms
6945 (parmparm
, argparm
, complain
, in_decl
, outer_args
))
6951 if (TEMPLATE_TYPE_PARAMETER_PACK (TREE_TYPE (arg
))
6952 && !TEMPLATE_TYPE_PARAMETER_PACK (TREE_TYPE (parm
)))
6953 /* Argument is a parameter pack but parameter is not. */
6958 /* The tsubst call is used to handle cases such as
6960 template <int> class C {};
6961 template <class T, template <T> class TT> class D {};
6964 i.e. the parameter list of TT depends on earlier parameters. */
6965 if (!uses_template_parms (TREE_TYPE (arg
)))
6967 tree t
= tsubst (TREE_TYPE (parm
), outer_args
, complain
, in_decl
);
6968 if (!uses_template_parms (t
)
6969 && !same_type_p (t
, TREE_TYPE (arg
)))
6973 if (TEMPLATE_PARM_PARAMETER_PACK (DECL_INITIAL (arg
))
6974 && !TEMPLATE_PARM_PARAMETER_PACK (DECL_INITIAL (parm
)))
6975 /* Argument is a parameter pack but parameter is not. */
6987 /* Coerce template argument list ARGLIST for use with template
6988 template-parameter TEMPL. */
6991 coerce_template_args_for_ttp (tree templ
, tree arglist
,
6992 tsubst_flags_t complain
)
6994 /* Consider an example where a template template parameter declared as
6996 template <class T, class U = std::allocator<T> > class TT
6998 The template parameter level of T and U are one level larger than
6999 of TT. To proper process the default argument of U, say when an
7000 instantiation `TT<int>' is seen, we need to build the full
7001 arguments containing {int} as the innermost level. Outer levels,
7002 available when not appearing as default template argument, can be
7003 obtained from the arguments of the enclosing template.
7005 Suppose that TT is later substituted with std::vector. The above
7006 instantiation is `TT<int, std::allocator<T> >' with TT at
7007 level 1, and T at level 2, while the template arguments at level 1
7008 becomes {std::vector} and the inner level 2 is {int}. */
7010 tree outer
= DECL_CONTEXT (templ
);
7013 if (DECL_TEMPLATE_SPECIALIZATION (outer
))
7014 /* We want arguments for the partial specialization, not arguments for
7015 the primary template. */
7016 outer
= template_parms_to_args (DECL_TEMPLATE_PARMS (outer
));
7018 outer
= TI_ARGS (get_template_info (DECL_TEMPLATE_RESULT (outer
)));
7020 else if (current_template_parms
)
7022 /* This is an argument of the current template, so we haven't set
7023 DECL_CONTEXT yet. */
7024 tree relevant_template_parms
;
7026 /* Parameter levels that are greater than the level of the given
7027 template template parm are irrelevant. */
7028 relevant_template_parms
= current_template_parms
;
7029 while (TMPL_PARMS_DEPTH (relevant_template_parms
)
7030 != TEMPLATE_TYPE_LEVEL (TREE_TYPE (templ
)))
7031 relevant_template_parms
= TREE_CHAIN (relevant_template_parms
);
7033 outer
= template_parms_to_args (relevant_template_parms
);
7037 arglist
= add_to_template_args (outer
, arglist
);
7039 tree parmlist
= DECL_INNERMOST_TEMPLATE_PARMS (templ
);
7040 return coerce_template_parms (parmlist
, arglist
, templ
,
7042 /*require_all_args=*/true,
7043 /*use_default_args=*/true);
7046 /* A cache of template template parameters with match-all default
7048 static GTY((deletable
)) hash_map
<tree
,tree
> *defaulted_ttp_cache
;
7050 store_defaulted_ttp (tree v
, tree t
)
7052 if (!defaulted_ttp_cache
)
7053 defaulted_ttp_cache
= hash_map
<tree
,tree
>::create_ggc (13);
7054 defaulted_ttp_cache
->put (v
, t
);
7057 lookup_defaulted_ttp (tree v
)
7059 if (defaulted_ttp_cache
)
7060 if (tree
*p
= defaulted_ttp_cache
->get (v
))
7065 /* T is a bound template template-parameter. Copy its arguments into default
7066 arguments of the template template-parameter's template parameters. */
7069 add_defaults_to_ttp (tree otmpl
)
7071 if (tree c
= lookup_defaulted_ttp (otmpl
))
7074 tree ntmpl
= copy_node (otmpl
);
7076 tree ntype
= copy_node (TREE_TYPE (otmpl
));
7077 TYPE_STUB_DECL (ntype
) = TYPE_NAME (ntype
) = ntmpl
;
7078 TYPE_MAIN_VARIANT (ntype
) = ntype
;
7079 TYPE_POINTER_TO (ntype
) = TYPE_REFERENCE_TO (ntype
) = NULL_TREE
;
7080 TYPE_NAME (ntype
) = ntmpl
;
7081 SET_TYPE_STRUCTURAL_EQUALITY (ntype
);
7083 tree idx
= TEMPLATE_TYPE_PARM_INDEX (ntype
)
7084 = copy_node (TEMPLATE_TYPE_PARM_INDEX (ntype
));
7085 TEMPLATE_PARM_DECL (idx
) = ntmpl
;
7086 TREE_TYPE (ntmpl
) = TREE_TYPE (idx
) = ntype
;
7088 tree oparms
= DECL_TEMPLATE_PARMS (otmpl
);
7089 tree parms
= DECL_TEMPLATE_PARMS (ntmpl
) = copy_node (oparms
);
7090 TREE_CHAIN (parms
) = TREE_CHAIN (oparms
);
7091 tree vec
= TREE_VALUE (parms
) = copy_node (TREE_VALUE (parms
));
7092 for (int i
= 0; i
< TREE_VEC_LENGTH (vec
); ++i
)
7094 tree o
= TREE_VEC_ELT (vec
, i
);
7095 if (!template_parameter_pack_p (TREE_VALUE (o
)))
7097 tree n
= TREE_VEC_ELT (vec
, i
) = copy_node (o
);
7098 TREE_PURPOSE (n
) = any_targ_node
;
7102 store_defaulted_ttp (otmpl
, ntmpl
);
7106 /* ARG is a bound potential template template-argument, and PARGS is a list
7107 of arguments for the corresponding template template-parameter. Adjust
7108 PARGS as appropriate for application to ARG's template, and if ARG is a
7109 BOUND_TEMPLATE_TEMPLATE_PARM, possibly adjust it to add default template
7110 arguments to the template template parameter. */
7113 coerce_ttp_args_for_tta (tree
& arg
, tree pargs
, tsubst_flags_t complain
)
7115 ++processing_template_decl
;
7116 tree arg_tmpl
= TYPE_TI_TEMPLATE (arg
);
7117 if (DECL_TEMPLATE_TEMPLATE_PARM_P (arg_tmpl
))
7119 /* When comparing two template template-parameters in partial ordering,
7120 rewrite the one currently being used as an argument to have default
7121 arguments for all parameters. */
7122 arg_tmpl
= add_defaults_to_ttp (arg_tmpl
);
7123 pargs
= coerce_template_args_for_ttp (arg_tmpl
, pargs
, complain
);
7124 if (pargs
!= error_mark_node
)
7125 arg
= bind_template_template_parm (TREE_TYPE (arg_tmpl
),
7126 TYPE_TI_ARGS (arg
));
7131 = INNERMOST_TEMPLATE_PARMS (DECL_TEMPLATE_PARMS (arg_tmpl
));
7132 pargs
= coerce_template_parms (aparms
, pargs
, arg_tmpl
, complain
,
7133 /*require_all*/true,
7134 /*use_default*/true);
7136 --processing_template_decl
;
7140 /* Subroutine of unify for the case when PARM is a
7141 BOUND_TEMPLATE_TEMPLATE_PARM. */
7144 unify_bound_ttp_args (tree tparms
, tree targs
, tree parm
, tree
& arg
,
7147 tree parmvec
= TYPE_TI_ARGS (parm
);
7148 tree argvec
= INNERMOST_TEMPLATE_ARGS (TYPE_TI_ARGS (arg
));
7150 /* The template template parm might be variadic and the argument
7151 not, so flatten both argument lists. */
7152 parmvec
= expand_template_argument_pack (parmvec
);
7153 argvec
= expand_template_argument_pack (argvec
);
7157 /* In keeping with P0522R0, adjust P's template arguments
7158 to apply to A's template; then flatten it again. */
7159 tree nparmvec
= parmvec
;
7160 nparmvec
= coerce_ttp_args_for_tta (arg
, parmvec
, tf_none
);
7161 nparmvec
= expand_template_argument_pack (nparmvec
);
7163 if (unify (tparms
, targs
, nparmvec
, argvec
,
7164 UNIFY_ALLOW_NONE
, explain_p
))
7167 /* If the P0522 adjustment eliminated a pack expansion, deduce
7170 && TREE_VEC_LENGTH (nparmvec
) < TREE_VEC_LENGTH (parmvec
)
7171 && unify_pack_expansion (tparms
, targs
, parmvec
, argvec
,
7172 DEDUCE_EXACT
, /*sub*/true, explain_p
))
7177 /* Deduce arguments T, i from TT<T> or TT<i>.
7178 We check each element of PARMVEC and ARGVEC individually
7179 rather than the whole TREE_VEC since they can have
7180 different number of elements, which is allowed under N2555. */
7182 int len
= TREE_VEC_LENGTH (parmvec
);
7184 /* Check if the parameters end in a pack, making them
7186 int parm_variadic_p
= 0;
7188 && PACK_EXPANSION_P (TREE_VEC_ELT (parmvec
, len
- 1)))
7189 parm_variadic_p
= 1;
7191 for (int i
= 0; i
< len
- parm_variadic_p
; ++i
)
7192 /* If the template argument list of P contains a pack
7193 expansion that is not the last template argument, the
7194 entire template argument list is a non-deduced
7196 if (PACK_EXPANSION_P (TREE_VEC_ELT (parmvec
, i
)))
7197 return unify_success (explain_p
);
7199 if (TREE_VEC_LENGTH (argvec
) < len
- parm_variadic_p
)
7200 return unify_too_few_arguments (explain_p
,
7201 TREE_VEC_LENGTH (argvec
), len
);
7203 for (int i
= 0; i
< len
- parm_variadic_p
; ++i
)
7204 if (unify (tparms
, targs
,
7205 TREE_VEC_ELT (parmvec
, i
),
7206 TREE_VEC_ELT (argvec
, i
),
7207 UNIFY_ALLOW_NONE
, explain_p
))
7211 && unify_pack_expansion (tparms
, targs
,
7214 /*subr=*/true, explain_p
))
7221 /* Return 1 if PARM_PARMS and ARG_PARMS matches using rule for
7222 template template parameters. Both PARM_PARMS and ARG_PARMS are
7223 vectors of TREE_LIST nodes containing TYPE_DECL, TEMPLATE_DECL
7226 Consider the example:
7227 template <class T> class A;
7228 template<template <class U> class TT> class B;
7230 For B<A>, PARM_PARMS are the parameters to TT, while ARG_PARMS are
7231 the parameters to A, and OUTER_ARGS contains A. */
7234 coerce_template_template_parms (tree parm_parms
,
7236 tsubst_flags_t complain
,
7240 int nparms
, nargs
, i
;
7244 gcc_assert (TREE_CODE (parm_parms
) == TREE_VEC
);
7245 gcc_assert (TREE_CODE (arg_parms
) == TREE_VEC
);
7247 nparms
= TREE_VEC_LENGTH (parm_parms
);
7248 nargs
= TREE_VEC_LENGTH (arg_parms
);
7252 /* P0522R0: A template template-parameter P is at least as specialized as
7253 a template template-argument A if, given the following rewrite to two
7254 function templates, the function template corresponding to P is at
7255 least as specialized as the function template corresponding to A
7256 according to the partial ordering rules for function templates
7257 ([temp.func.order]). Given an invented class template X with the
7258 template parameter list of A (including default arguments):
7260 * Each of the two function templates has the same template parameters,
7261 respectively, as P or A.
7263 * Each function template has a single function parameter whose type is
7264 a specialization of X with template arguments corresponding to the
7265 template parameters from the respective function template where, for
7266 each template parameter PP in the template parameter list of the
7267 function template, a corresponding template argument AA is formed. If
7268 PP declares a parameter pack, then AA is the pack expansion
7269 PP... ([temp.variadic]); otherwise, AA is the id-expression PP.
7271 If the rewrite produces an invalid type, then P is not at least as
7272 specialized as A. */
7274 /* So coerce P's args to apply to A's parms, and then deduce between A's
7275 args and the converted args. If that succeeds, A is at least as
7276 specialized as P, so they match.*/
7277 tree pargs
= template_parms_level_to_args (parm_parms
);
7278 ++processing_template_decl
;
7279 pargs
= coerce_template_parms (arg_parms
, pargs
, NULL_TREE
, tf_none
,
7280 /*require_all*/true, /*use_default*/true);
7281 --processing_template_decl
;
7282 if (pargs
!= error_mark_node
)
7284 tree targs
= make_tree_vec (nargs
);
7285 tree aargs
= template_parms_level_to_args (arg_parms
);
7286 if (!unify (arg_parms
, targs
, aargs
, pargs
, UNIFY_ALLOW_NONE
,
7292 /* Determine whether we have a parameter pack at the end of the
7293 template template parameter's template parameter list. */
7294 if (TREE_VEC_ELT (parm_parms
, nparms
- 1) != error_mark_node
)
7296 parm
= TREE_VALUE (TREE_VEC_ELT (parm_parms
, nparms
- 1));
7298 if (error_operand_p (parm
))
7301 switch (TREE_CODE (parm
))
7305 if (TEMPLATE_TYPE_PARAMETER_PACK (TREE_TYPE (parm
)))
7310 if (TEMPLATE_PARM_PARAMETER_PACK (DECL_INITIAL (parm
)))
7320 && !(variadic_p
&& nargs
>= nparms
- 1))
7323 /* Check all of the template parameters except the parameter pack at
7324 the end (if any). */
7325 for (i
= 0; i
< nparms
- variadic_p
; ++i
)
7327 if (TREE_VEC_ELT (parm_parms
, i
) == error_mark_node
7328 || TREE_VEC_ELT (arg_parms
, i
) == error_mark_node
)
7331 parm
= TREE_VALUE (TREE_VEC_ELT (parm_parms
, i
));
7332 arg
= TREE_VALUE (TREE_VEC_ELT (arg_parms
, i
));
7334 if (!coerce_template_template_parm (parm
, arg
, complain
, in_decl
,
7342 /* Check each of the template parameters in the template
7343 argument against the template parameter pack at the end of
7344 the template template parameter. */
7345 if (TREE_VEC_ELT (parm_parms
, i
) == error_mark_node
)
7348 parm
= TREE_VALUE (TREE_VEC_ELT (parm_parms
, i
));
7350 for (; i
< nargs
; ++i
)
7352 if (TREE_VEC_ELT (arg_parms
, i
) == error_mark_node
)
7355 arg
= TREE_VALUE (TREE_VEC_ELT (arg_parms
, i
));
7357 if (!coerce_template_template_parm (parm
, arg
, complain
, in_decl
,
7366 /* Verifies that the deduced template arguments (in TARGS) for the
7367 template template parameters (in TPARMS) represent valid bindings,
7368 by comparing the template parameter list of each template argument
7369 to the template parameter list of its corresponding template
7370 template parameter, in accordance with DR150. This
7371 routine can only be called after all template arguments have been
7372 deduced. It will return TRUE if all of the template template
7373 parameter bindings are okay, FALSE otherwise. */
7375 template_template_parm_bindings_ok_p (tree tparms
, tree targs
)
7377 int i
, ntparms
= TREE_VEC_LENGTH (tparms
);
7380 /* We're dealing with template parms in this process. */
7381 ++processing_template_decl
;
7383 targs
= INNERMOST_TEMPLATE_ARGS (targs
);
7385 for (i
= 0; i
< ntparms
; ++i
)
7387 tree tparm
= TREE_VALUE (TREE_VEC_ELT (tparms
, i
));
7388 tree targ
= TREE_VEC_ELT (targs
, i
);
7390 if (TREE_CODE (tparm
) == TEMPLATE_DECL
&& targ
)
7392 tree packed_args
= NULL_TREE
;
7395 if (ARGUMENT_PACK_P (targ
))
7397 /* Look inside the argument pack. */
7398 packed_args
= ARGUMENT_PACK_ARGS (targ
);
7399 len
= TREE_VEC_LENGTH (packed_args
);
7402 for (idx
= 0; idx
< len
; ++idx
)
7404 tree targ_parms
= NULL_TREE
;
7407 /* Extract the next argument from the argument
7409 targ
= TREE_VEC_ELT (packed_args
, idx
);
7411 if (PACK_EXPANSION_P (targ
))
7412 /* Look at the pattern of the pack expansion. */
7413 targ
= PACK_EXPANSION_PATTERN (targ
);
7415 /* Extract the template parameters from the template
7417 if (TREE_CODE (targ
) == TEMPLATE_DECL
)
7418 targ_parms
= DECL_INNERMOST_TEMPLATE_PARMS (targ
);
7419 else if (TREE_CODE (targ
) == TEMPLATE_TEMPLATE_PARM
)
7420 targ_parms
= DECL_INNERMOST_TEMPLATE_PARMS (TYPE_NAME (targ
));
7422 /* Verify that we can coerce the template template
7423 parameters from the template argument to the template
7424 parameter. This requires an exact match. */
7426 && !coerce_template_template_parms
7427 (DECL_INNERMOST_TEMPLATE_PARMS (tparm
),
7442 --processing_template_decl
;
7446 /* Since type attributes aren't mangled, we need to strip them from
7447 template type arguments. */
7450 canonicalize_type_argument (tree arg
, tsubst_flags_t complain
)
7452 if (!arg
|| arg
== error_mark_node
|| arg
== TYPE_CANONICAL (arg
))
7454 bool removed_attributes
= false;
7455 tree canon
= strip_typedefs (arg
, &removed_attributes
);
7456 if (removed_attributes
7457 && (complain
& tf_warning
))
7458 warning (OPT_Wignored_attributes
,
7459 "ignoring attributes on template argument %qT", arg
);
7463 /* And from inside dependent non-type arguments like sizeof(Type). */
7466 canonicalize_expr_argument (tree arg
, tsubst_flags_t complain
)
7468 if (!arg
|| arg
== error_mark_node
)
7470 bool removed_attributes
= false;
7471 tree canon
= strip_typedefs_expr (arg
, &removed_attributes
);
7472 if (removed_attributes
7473 && (complain
& tf_warning
))
7474 warning (OPT_Wignored_attributes
,
7475 "ignoring attributes in template argument %qE", arg
);
7479 // A template declaration can be substituted for a constrained
7480 // template template parameter only when the argument is more
7481 // constrained than the parameter.
7483 is_compatible_template_arg (tree parm
, tree arg
)
7485 tree parm_cons
= get_constraints (parm
);
7487 /* For now, allow constrained template template arguments
7488 and unconstrained template template parameters. */
7489 if (parm_cons
== NULL_TREE
)
7492 tree arg_cons
= get_constraints (arg
);
7494 // If the template parameter is constrained, we need to rewrite its
7495 // constraints in terms of the ARG's template parameters. This ensures
7496 // that all of the template parameter types will have the same depth.
7498 // Note that this is only valid when coerce_template_template_parm is
7499 // true for the innermost template parameters of PARM and ARG. In other
7500 // words, because coercion is successful, this conversion will be valid.
7503 tree args
= template_parms_to_args (DECL_TEMPLATE_PARMS (arg
));
7504 parm_cons
= tsubst_constraint_info (parm_cons
,
7505 INNERMOST_TEMPLATE_ARGS (args
),
7506 tf_none
, NULL_TREE
);
7507 if (parm_cons
== error_mark_node
)
7511 return subsumes (parm_cons
, arg_cons
);
7514 // Convert a placeholder argument into a binding to the original
7515 // parameter. The original parameter is saved as the TREE_TYPE of
7518 convert_wildcard_argument (tree parm
, tree arg
)
7520 TREE_TYPE (arg
) = parm
;
7524 /* We can't fully resolve ARG given as a non-type template argument to TYPE,
7525 because one of them is dependent. But we need to represent the
7526 conversion for the benefit of cp_tree_equal. */
7529 maybe_convert_nontype_argument (tree type
, tree arg
)
7531 /* Auto parms get no conversion. */
7532 if (type_uses_auto (type
))
7534 /* We don't need or want to add this conversion now if we're going to use the
7535 argument for deduction. */
7536 if (value_dependent_expression_p (arg
))
7539 type
= cv_unqualified (type
);
7540 tree argtype
= TREE_TYPE (arg
);
7541 if (same_type_p (type
, argtype
))
7544 arg
= build1 (IMPLICIT_CONV_EXPR
, type
, arg
);
7545 IMPLICIT_CONV_EXPR_NONTYPE_ARG (arg
) = true;
7549 /* Convert the indicated template ARG as necessary to match the
7550 indicated template PARM. Returns the converted ARG, or
7551 error_mark_node if the conversion was unsuccessful. Error and
7552 warning messages are issued under control of COMPLAIN. This
7553 conversion is for the Ith parameter in the parameter list. ARGS is
7554 the full set of template arguments deduced so far. */
7557 convert_template_argument (tree parm
,
7560 tsubst_flags_t complain
,
7566 int is_type
, requires_type
, is_tmpl_type
, requires_tmpl_type
;
7568 if (parm
== error_mark_node
)
7569 return error_mark_node
;
7571 /* Trivially convert placeholders. */
7572 if (TREE_CODE (arg
) == WILDCARD_DECL
)
7573 return convert_wildcard_argument (parm
, arg
);
7575 if (arg
== any_targ_node
)
7578 if (TREE_CODE (arg
) == TREE_LIST
7579 && TREE_CODE (TREE_VALUE (arg
)) == OFFSET_REF
)
7581 /* The template argument was the name of some
7582 member function. That's usually
7583 invalid, but static members are OK. In any
7584 case, grab the underlying fields/functions
7585 and issue an error later if required. */
7586 orig_arg
= TREE_VALUE (arg
);
7587 TREE_TYPE (arg
) = unknown_type_node
;
7592 requires_tmpl_type
= TREE_CODE (parm
) == TEMPLATE_DECL
;
7593 requires_type
= (TREE_CODE (parm
) == TYPE_DECL
7594 || requires_tmpl_type
);
7596 /* When determining whether an argument pack expansion is a template,
7597 look at the pattern. */
7598 if (TREE_CODE (arg
) == TYPE_PACK_EXPANSION
)
7599 arg
= PACK_EXPANSION_PATTERN (arg
);
7601 /* Deal with an injected-class-name used as a template template arg. */
7602 if (requires_tmpl_type
&& CLASS_TYPE_P (arg
))
7604 tree t
= maybe_get_template_decl_from_type_decl (TYPE_NAME (arg
));
7605 if (TREE_CODE (t
) == TEMPLATE_DECL
)
7607 if (cxx_dialect
>= cxx11
)
7608 /* OK under DR 1004. */;
7609 else if (complain
& tf_warning_or_error
)
7610 pedwarn (input_location
, OPT_Wpedantic
, "injected-class-name %qD"
7611 " used as template template argument", TYPE_NAME (arg
));
7612 else if (flag_pedantic_errors
)
7620 ((TREE_CODE (arg
) == TEMPLATE_DECL
7621 && TREE_CODE (DECL_TEMPLATE_RESULT (arg
)) == TYPE_DECL
)
7622 || (requires_tmpl_type
&& TREE_CODE (arg
) == TYPE_ARGUMENT_PACK
)
7623 || TREE_CODE (arg
) == TEMPLATE_TEMPLATE_PARM
7624 || TREE_CODE (arg
) == UNBOUND_CLASS_TEMPLATE
);
7627 && (TREE_CODE (arg
) == TEMPLATE_TEMPLATE_PARM
7628 || TREE_CODE (arg
) == UNBOUND_CLASS_TEMPLATE
))
7629 arg
= TYPE_STUB_DECL (arg
);
7631 is_type
= TYPE_P (arg
) || is_tmpl_type
;
7633 if (requires_type
&& ! is_type
&& TREE_CODE (arg
) == SCOPE_REF
7634 && TREE_CODE (TREE_OPERAND (arg
, 0)) == TEMPLATE_TYPE_PARM
)
7636 if (TREE_CODE (TREE_OPERAND (arg
, 1)) == BIT_NOT_EXPR
)
7638 if (complain
& tf_error
)
7639 error ("invalid use of destructor %qE as a type", orig_arg
);
7640 return error_mark_node
;
7643 permerror (input_location
,
7644 "to refer to a type member of a template parameter, "
7645 "use %<typename %E%>", orig_arg
);
7647 orig_arg
= make_typename_type (TREE_OPERAND (arg
, 0),
7648 TREE_OPERAND (arg
, 1),
7654 if (is_type
!= requires_type
)
7658 if (complain
& tf_error
)
7660 error ("type/value mismatch at argument %d in template "
7661 "parameter list for %qD",
7664 inform (input_location
,
7665 " expected a constant of type %qT, got %qT",
7667 (DECL_P (arg
) ? DECL_NAME (arg
) : orig_arg
));
7668 else if (requires_tmpl_type
)
7669 inform (input_location
,
7670 " expected a class template, got %qE", orig_arg
);
7672 inform (input_location
,
7673 " expected a type, got %qE", orig_arg
);
7676 return error_mark_node
;
7678 if (is_tmpl_type
^ requires_tmpl_type
)
7680 if (in_decl
&& (complain
& tf_error
))
7682 error ("type/value mismatch at argument %d in template "
7683 "parameter list for %qD",
7686 inform (input_location
,
7687 " expected a type, got %qT", DECL_NAME (arg
));
7689 inform (input_location
,
7690 " expected a class template, got %qT", orig_arg
);
7692 return error_mark_node
;
7695 if (template_parameter_pack_p (parm
) && ARGUMENT_PACK_P (orig_arg
))
7696 /* We already did the appropriate conversion when packing args. */
7700 if (requires_tmpl_type
)
7702 if (TREE_CODE (TREE_TYPE (arg
)) == UNBOUND_CLASS_TEMPLATE
)
7703 /* The number of argument required is not known yet.
7704 Just accept it for now. */
7708 tree parmparm
= DECL_INNERMOST_TEMPLATE_PARMS (parm
);
7711 /* Strip alias templates that are equivalent to another
7713 arg
= get_underlying_template (arg
);
7714 argparm
= DECL_INNERMOST_TEMPLATE_PARMS (arg
);
7716 if (coerce_template_template_parms (parmparm
, argparm
,
7722 /* TEMPLATE_TEMPLATE_PARM node is preferred over
7724 if (val
!= error_mark_node
)
7726 if (DECL_TEMPLATE_TEMPLATE_PARM_P (val
))
7727 val
= TREE_TYPE (val
);
7728 if (TREE_CODE (orig_arg
) == TYPE_PACK_EXPANSION
)
7729 val
= make_pack_expansion (val
, complain
);
7734 if (in_decl
&& (complain
& tf_error
))
7736 error ("type/value mismatch at argument %d in "
7737 "template parameter list for %qD",
7739 inform (input_location
,
7740 " expected a template of type %qD, got %qT",
7744 val
= error_mark_node
;
7747 // Check that the constraints are compatible before allowing the
7749 if (val
!= error_mark_node
)
7750 if (!is_compatible_template_arg (parm
, arg
))
7752 if (in_decl
&& (complain
& tf_error
))
7754 error ("constraint mismatch at argument %d in "
7755 "template parameter list for %qD",
7757 inform (input_location
, " expected %qD but got %qD",
7760 val
= error_mark_node
;
7766 /* We only form one instance of each template specialization.
7767 Therefore, if we use a non-canonical variant (i.e., a
7768 typedef), any future messages referring to the type will use
7769 the typedef, which is confusing if those future uses do not
7770 themselves also use the typedef. */
7772 val
= canonicalize_type_argument (val
, complain
);
7776 tree t
= TREE_TYPE (parm
);
7778 if (tree a
= type_uses_auto (t
))
7780 t
= do_auto_deduction (t
, arg
, a
, complain
, adc_unify
, args
);
7781 if (t
== error_mark_node
)
7782 return error_mark_node
;
7785 t
= tsubst (t
, args
, complain
, in_decl
);
7787 if (invalid_nontype_parm_type_p (t
, complain
))
7788 return error_mark_node
;
7790 if (!type_dependent_expression_p (orig_arg
)
7791 && !uses_template_parms (t
))
7792 /* We used to call digest_init here. However, digest_init
7793 will report errors, which we don't want when complain
7794 is zero. More importantly, digest_init will try too
7795 hard to convert things: for example, `0' should not be
7796 converted to pointer type at this point according to
7797 the standard. Accepting this is not merely an
7798 extension, since deciding whether or not these
7799 conversions can occur is part of determining which
7800 function template to call, or whether a given explicit
7801 argument specification is valid. */
7802 val
= convert_nontype_argument (t
, orig_arg
, complain
);
7805 val
= canonicalize_expr_argument (orig_arg
, complain
);
7806 val
= maybe_convert_nontype_argument (t
, val
);
7810 if (val
== NULL_TREE
)
7811 val
= error_mark_node
;
7812 else if (val
== error_mark_node
&& (complain
& tf_error
))
7813 error ("could not convert template argument %qE from %qT to %qT",
7814 orig_arg
, TREE_TYPE (orig_arg
), t
);
7816 if (INDIRECT_REF_P (val
))
7818 /* Reject template arguments that are references to built-in
7819 functions with no library fallbacks. */
7820 const_tree inner
= TREE_OPERAND (val
, 0);
7821 const_tree innertype
= TREE_TYPE (inner
);
7823 && TREE_CODE (innertype
) == REFERENCE_TYPE
7824 && TREE_CODE (TREE_TYPE (innertype
)) == FUNCTION_TYPE
7825 && 0 < TREE_OPERAND_LENGTH (inner
)
7826 && reject_gcc_builtin (TREE_OPERAND (inner
, 0)))
7827 return error_mark_node
;
7830 if (TREE_CODE (val
) == SCOPE_REF
)
7832 /* Strip typedefs from the SCOPE_REF. */
7833 tree type
= canonicalize_type_argument (TREE_TYPE (val
), complain
);
7834 tree scope
= canonicalize_type_argument (TREE_OPERAND (val
, 0),
7836 val
= build_qualified_name (type
, scope
, TREE_OPERAND (val
, 1),
7837 QUALIFIED_NAME_IS_TEMPLATE (val
));
7844 /* Coerces the remaining template arguments in INNER_ARGS (from
7845 ARG_IDX to the end) into the parameter pack at PARM_IDX in PARMS.
7846 Returns the coerced argument pack. PARM_IDX is the position of this
7847 parameter in the template parameter list. ARGS is the original
7848 template argument list. */
7850 coerce_template_parameter_pack (tree parms
,
7858 tsubst_flags_t complain
)
7860 tree parm
= TREE_VEC_ELT (parms
, parm_idx
);
7861 int nargs
= inner_args
? NUM_TMPL_ARGS (inner_args
) : 0;
7864 tree packed_parms
= NULL_TREE
;
7866 if (arg_idx
> nargs
)
7869 if (tree packs
= fixed_parameter_pack_p (TREE_VALUE (parm
)))
7871 /* When the template parameter is a non-type template parameter pack
7872 or template template parameter pack whose type or template
7873 parameters use parameter packs, we know exactly how many arguments
7874 we are looking for. Build a vector of the instantiated decls for
7875 these template parameters in PACKED_PARMS. */
7876 /* We can't use make_pack_expansion here because it would interpret a
7877 _DECL as a use rather than a declaration. */
7878 tree decl
= TREE_VALUE (parm
);
7879 tree exp
= cxx_make_type (TYPE_PACK_EXPANSION
);
7880 SET_PACK_EXPANSION_PATTERN (exp
, decl
);
7881 PACK_EXPANSION_PARAMETER_PACKS (exp
) = packs
;
7882 SET_TYPE_STRUCTURAL_EQUALITY (exp
);
7884 TREE_VEC_LENGTH (args
)--;
7885 packed_parms
= tsubst_pack_expansion (exp
, args
, complain
, decl
);
7886 TREE_VEC_LENGTH (args
)++;
7888 if (packed_parms
== error_mark_node
)
7889 return error_mark_node
;
7891 /* If we're doing a partial instantiation of a member template,
7892 verify that all of the types used for the non-type
7893 template parameter pack are, in fact, valid for non-type
7894 template parameters. */
7896 && PACK_EXPANSION_P (TREE_VEC_ELT (inner_args
, arg_idx
)))
7898 int j
, len
= TREE_VEC_LENGTH (packed_parms
);
7899 for (j
= 0; j
< len
; ++j
)
7901 tree t
= TREE_TYPE (TREE_VEC_ELT (packed_parms
, j
));
7902 if (invalid_nontype_parm_type_p (t
, complain
))
7903 return error_mark_node
;
7905 /* We don't know how many args we have yet, just
7906 use the unconverted ones for now. */
7910 packed_args
= make_tree_vec (TREE_VEC_LENGTH (packed_parms
));
7912 /* Check if we have a placeholder pack, which indicates we're
7913 in the context of a introduction list. In that case we want
7914 to match this pack to the single placeholder. */
7915 else if (arg_idx
< nargs
7916 && TREE_CODE (TREE_VEC_ELT (inner_args
, arg_idx
)) == WILDCARD_DECL
7917 && WILDCARD_PACK_P (TREE_VEC_ELT (inner_args
, arg_idx
)))
7919 nargs
= arg_idx
+ 1;
7920 packed_args
= make_tree_vec (1);
7923 packed_args
= make_tree_vec (nargs
- arg_idx
);
7925 /* Convert the remaining arguments, which will be a part of the
7926 parameter pack "parm". */
7927 int first_pack_arg
= arg_idx
;
7928 for (; arg_idx
< nargs
; ++arg_idx
)
7930 tree arg
= TREE_VEC_ELT (inner_args
, arg_idx
);
7931 tree actual_parm
= TREE_VALUE (parm
);
7932 int pack_idx
= arg_idx
- first_pack_arg
;
7936 /* Once we've packed as many args as we have types, stop. */
7937 if (pack_idx
>= TREE_VEC_LENGTH (packed_parms
))
7939 else if (PACK_EXPANSION_P (arg
))
7940 /* We don't know how many args we have yet, just
7941 use the unconverted ones for now. */
7944 actual_parm
= TREE_VEC_ELT (packed_parms
, pack_idx
);
7947 if (arg
== error_mark_node
)
7949 if (complain
& tf_error
)
7950 error ("template argument %d is invalid", arg_idx
+ 1);
7953 arg
= convert_template_argument (actual_parm
,
7954 arg
, new_args
, complain
, parm_idx
,
7956 if (arg
== error_mark_node
)
7958 TREE_VEC_ELT (packed_args
, pack_idx
) = arg
;
7961 if (arg_idx
- first_pack_arg
< TREE_VEC_LENGTH (packed_args
)
7962 && TREE_VEC_LENGTH (packed_args
) > 0)
7964 if (complain
& tf_error
)
7965 error ("wrong number of template arguments (%d, should be %d)",
7966 arg_idx
- first_pack_arg
, TREE_VEC_LENGTH (packed_args
));
7967 return error_mark_node
;
7970 if (TREE_CODE (TREE_VALUE (parm
)) == TYPE_DECL
7971 || TREE_CODE (TREE_VALUE (parm
)) == TEMPLATE_DECL
)
7972 argument_pack
= cxx_make_type (TYPE_ARGUMENT_PACK
);
7975 argument_pack
= make_node (NONTYPE_ARGUMENT_PACK
);
7976 TREE_CONSTANT (argument_pack
) = 1;
7979 SET_ARGUMENT_PACK_ARGS (argument_pack
, packed_args
);
7981 SET_NON_DEFAULT_TEMPLATE_ARGS_COUNT (packed_args
,
7982 TREE_VEC_LENGTH (packed_args
));
7983 return argument_pack
;
7986 /* Returns the number of pack expansions in the template argument vector
7990 pack_expansion_args_count (tree args
)
7995 for (i
= 0; i
< TREE_VEC_LENGTH (args
); ++i
)
7997 tree elt
= TREE_VEC_ELT (args
, i
);
7998 if (elt
&& PACK_EXPANSION_P (elt
))
8004 /* Convert all template arguments to their appropriate types, and
8005 return a vector containing the innermost resulting template
8006 arguments. If any error occurs, return error_mark_node. Error and
8007 warning messages are issued under control of COMPLAIN.
8009 If REQUIRE_ALL_ARGS is false, argument deduction will be performed
8010 for arguments not specified in ARGS. Otherwise, if
8011 USE_DEFAULT_ARGS is true, default arguments will be used to fill in
8012 unspecified arguments. If REQUIRE_ALL_ARGS is true, but
8013 USE_DEFAULT_ARGS is false, then all arguments must be specified in
8017 coerce_template_parms (tree parms
,
8020 tsubst_flags_t complain
,
8021 bool require_all_args
,
8022 bool use_default_args
)
8024 int nparms
, nargs
, parm_idx
, arg_idx
, lost
= 0;
8025 tree orig_inner_args
;
8028 tree new_inner_args
;
8029 int saved_unevaluated_operand
;
8030 int saved_inhibit_evaluation_warnings
;
8032 /* When used as a boolean value, indicates whether this is a
8033 variadic template parameter list. Since it's an int, we can also
8034 subtract it from nparms to get the number of non-variadic
8037 int variadic_args_p
= 0;
8038 int post_variadic_parms
= 0;
8040 /* Likewise for parameters with default arguments. */
8043 if (args
== error_mark_node
)
8044 return error_mark_node
;
8046 nparms
= TREE_VEC_LENGTH (parms
);
8048 /* Determine if there are any parameter packs or default arguments. */
8049 for (parm_idx
= 0; parm_idx
< nparms
; ++parm_idx
)
8051 tree parm
= TREE_VEC_ELT (parms
, parm_idx
);
8053 ++post_variadic_parms
;
8054 if (template_parameter_pack_p (TREE_VALUE (parm
)))
8056 if (TREE_PURPOSE (parm
))
8060 inner_args
= orig_inner_args
= INNERMOST_TEMPLATE_ARGS (args
);
8061 /* If there are no parameters that follow a parameter pack, we need to
8062 expand any argument packs so that we can deduce a parameter pack from
8063 some non-packed args followed by an argument pack, as in variadic85.C.
8064 If there are such parameters, we need to leave argument packs intact
8065 so the arguments are assigned properly. This can happen when dealing
8066 with a nested class inside a partial specialization of a class
8067 template, as in variadic92.C, or when deducing a template parameter pack
8068 from a sub-declarator, as in variadic114.C. */
8069 if (!post_variadic_parms
)
8070 inner_args
= expand_template_argument_pack (inner_args
);
8072 /* Count any pack expansion args. */
8073 variadic_args_p
= pack_expansion_args_count (inner_args
);
8075 nargs
= inner_args
? NUM_TMPL_ARGS (inner_args
) : 0;
8076 if ((nargs
- variadic_args_p
> nparms
&& !variadic_p
)
8077 || (nargs
< nparms
- variadic_p
8080 && (!use_default_args
8081 || (TREE_VEC_ELT (parms
, nargs
) != error_mark_node
8082 && !TREE_PURPOSE (TREE_VEC_ELT (parms
, nargs
))))))
8084 if (complain
& tf_error
)
8086 if (variadic_p
|| default_p
)
8088 nparms
-= variadic_p
+ default_p
;
8089 error ("wrong number of template arguments "
8090 "(%d, should be at least %d)", nargs
, nparms
);
8093 error ("wrong number of template arguments "
8094 "(%d, should be %d)", nargs
, nparms
);
8097 inform (DECL_SOURCE_LOCATION (in_decl
),
8098 "provided for %qD", in_decl
);
8101 return error_mark_node
;
8103 /* We can't pass a pack expansion to a non-pack parameter of an alias
8104 template (DR 1430). */
8106 && (DECL_ALIAS_TEMPLATE_P (in_decl
)
8107 || concept_template_p (in_decl
))
8109 && nargs
- variadic_args_p
< nparms
- variadic_p
)
8111 if (complain
& tf_error
)
8113 for (int i
= 0; i
< TREE_VEC_LENGTH (inner_args
); ++i
)
8115 tree arg
= TREE_VEC_ELT (inner_args
, i
);
8116 tree parm
= TREE_VALUE (TREE_VEC_ELT (parms
, i
));
8118 if (PACK_EXPANSION_P (arg
)
8119 && !template_parameter_pack_p (parm
))
8121 if (DECL_ALIAS_TEMPLATE_P (in_decl
))
8122 error_at (location_of (arg
),
8123 "pack expansion argument for non-pack parameter "
8124 "%qD of alias template %qD", parm
, in_decl
);
8126 error_at (location_of (arg
),
8127 "pack expansion argument for non-pack parameter "
8128 "%qD of concept %qD", parm
, in_decl
);
8129 inform (DECL_SOURCE_LOCATION (parm
), "declared here");
8136 return error_mark_node
;
8139 /* We need to evaluate the template arguments, even though this
8140 template-id may be nested within a "sizeof". */
8141 saved_unevaluated_operand
= cp_unevaluated_operand
;
8142 cp_unevaluated_operand
= 0;
8143 saved_inhibit_evaluation_warnings
= c_inhibit_evaluation_warnings
;
8144 c_inhibit_evaluation_warnings
= 0;
8145 new_inner_args
= make_tree_vec (nparms
);
8146 new_args
= add_outermost_template_args (args
, new_inner_args
);
8147 int pack_adjust
= 0;
8148 for (parm_idx
= 0, arg_idx
= 0; parm_idx
< nparms
; parm_idx
++, arg_idx
++)
8153 /* Get the Ith template parameter. */
8154 parm
= TREE_VEC_ELT (parms
, parm_idx
);
8156 if (parm
== error_mark_node
)
8158 TREE_VEC_ELT (new_inner_args
, arg_idx
) = error_mark_node
;
8162 /* Calculate the next argument. */
8163 if (arg_idx
< nargs
)
8164 arg
= TREE_VEC_ELT (inner_args
, arg_idx
);
8168 if (template_parameter_pack_p (TREE_VALUE (parm
))
8169 && !(arg
&& ARGUMENT_PACK_P (arg
)))
8171 /* Some arguments will be placed in the
8172 template parameter pack PARM. */
8173 arg
= coerce_template_parameter_pack (parms
, parm_idx
, args
,
8174 inner_args
, arg_idx
,
8178 if (arg
== NULL_TREE
)
8180 /* We don't know how many args we have yet, just use the
8181 unconverted (and still packed) ones for now. */
8182 new_inner_args
= orig_inner_args
;
8187 TREE_VEC_ELT (new_inner_args
, parm_idx
) = arg
;
8189 /* Store this argument. */
8190 if (arg
== error_mark_node
)
8193 /* We are done with all of the arguments. */
8198 pack_adjust
= TREE_VEC_LENGTH (ARGUMENT_PACK_ARGS (arg
)) - 1;
8199 arg_idx
+= pack_adjust
;
8206 if (PACK_EXPANSION_P (arg
))
8208 /* "If every valid specialization of a variadic template
8209 requires an empty template parameter pack, the template is
8210 ill-formed, no diagnostic required." So check that the
8211 pattern works with this parameter. */
8212 tree pattern
= PACK_EXPANSION_PATTERN (arg
);
8213 tree conv
= convert_template_argument (TREE_VALUE (parm
),
8217 if (conv
== error_mark_node
)
8219 if (complain
& tf_error
)
8220 inform (input_location
, "so any instantiation with a "
8221 "non-empty parameter pack would be ill-formed");
8224 else if (TYPE_P (conv
) && !TYPE_P (pattern
))
8225 /* Recover from missing typename. */
8226 TREE_VEC_ELT (inner_args
, arg_idx
)
8227 = make_pack_expansion (conv
, complain
);
8229 /* We don't know how many args we have yet, just
8230 use the unconverted ones for now. */
8231 new_inner_args
= inner_args
;
8236 else if (require_all_args
)
8238 /* There must be a default arg in this case. */
8239 arg
= tsubst_template_arg (TREE_PURPOSE (parm
), new_args
,
8241 /* The position of the first default template argument,
8242 is also the number of non-defaulted arguments in NEW_INNER_ARGS.
8244 if (!NON_DEFAULT_TEMPLATE_ARGS_COUNT (new_inner_args
))
8245 SET_NON_DEFAULT_TEMPLATE_ARGS_COUNT (new_inner_args
,
8246 arg_idx
- pack_adjust
);
8251 if (arg
== error_mark_node
)
8253 if (complain
& tf_error
)
8254 error ("template argument %d is invalid", arg_idx
+ 1);
8257 /* This only occurs if there was an error in the template
8258 parameter list itself (which we would already have
8259 reported) that we are trying to recover from, e.g., a class
8260 template with a parameter list such as
8261 template<typename..., typename>. */
8264 arg
= convert_template_argument (TREE_VALUE (parm
),
8265 arg
, new_args
, complain
,
8268 if (arg
== error_mark_node
)
8270 TREE_VEC_ELT (new_inner_args
, arg_idx
- pack_adjust
) = arg
;
8272 cp_unevaluated_operand
= saved_unevaluated_operand
;
8273 c_inhibit_evaluation_warnings
= saved_inhibit_evaluation_warnings
;
8275 if (variadic_p
&& arg_idx
< nargs
)
8277 if (complain
& tf_error
)
8279 error ("wrong number of template arguments "
8280 "(%d, should be %d)", nargs
, arg_idx
);
8282 error ("provided for %q+D", in_decl
);
8284 return error_mark_node
;
8288 return error_mark_node
;
8290 if (CHECKING_P
&& !NON_DEFAULT_TEMPLATE_ARGS_COUNT (new_inner_args
))
8291 SET_NON_DEFAULT_TEMPLATE_ARGS_COUNT (new_inner_args
,
8292 TREE_VEC_LENGTH (new_inner_args
));
8294 return new_inner_args
;
8297 /* Convert all template arguments to their appropriate types, and
8298 return a vector containing the innermost resulting template
8299 arguments. If any error occurs, return error_mark_node. Error and
8300 warning messages are not issued.
8302 Note that no function argument deduction is performed, and default
8303 arguments are used to fill in unspecified arguments. */
8305 coerce_template_parms (tree parms
, tree args
, tree in_decl
)
8307 return coerce_template_parms (parms
, args
, in_decl
, tf_none
, true, true);
8310 /* Convert all template arguments to their appropriate type, and
8311 instantiate default arguments as needed. This returns a vector
8312 containing the innermost resulting template arguments, or
8313 error_mark_node if unsuccessful. */
8315 coerce_template_parms (tree parms
, tree args
, tree in_decl
,
8316 tsubst_flags_t complain
)
8318 return coerce_template_parms (parms
, args
, in_decl
, complain
, true, true);
8321 /* Like coerce_template_parms. If PARMS represents all template
8322 parameters levels, this function returns a vector of vectors
8323 representing all the resulting argument levels. Note that in this
8324 case, only the innermost arguments are coerced because the
8325 outermost ones are supposed to have been coerced already.
8327 Otherwise, if PARMS represents only (the innermost) vector of
8328 parameters, this function returns a vector containing just the
8329 innermost resulting arguments. */
8332 coerce_innermost_template_parms (tree parms
,
8335 tsubst_flags_t complain
,
8336 bool require_all_args
,
8337 bool use_default_args
)
8339 int parms_depth
= TMPL_PARMS_DEPTH (parms
);
8340 int args_depth
= TMPL_ARGS_DEPTH (args
);
8343 if (parms_depth
> 1)
8345 coerced_args
= make_tree_vec (parms_depth
);
8349 for (level
= parms
, cur_depth
= parms_depth
;
8350 parms_depth
> 0 && level
!= NULL_TREE
;
8351 level
= TREE_CHAIN (level
), --cur_depth
)
8354 if (cur_depth
== args_depth
)
8355 l
= coerce_template_parms (TREE_VALUE (level
),
8356 args
, in_decl
, complain
,
8360 l
= TMPL_ARGS_LEVEL (args
, cur_depth
);
8362 if (l
== error_mark_node
)
8363 return error_mark_node
;
8365 SET_TMPL_ARGS_LEVEL (coerced_args
, cur_depth
, l
);
8369 coerced_args
= coerce_template_parms (INNERMOST_TEMPLATE_PARMS (parms
),
8370 args
, in_decl
, complain
,
8373 return coerced_args
;
8376 /* Returns 1 if template args OT and NT are equivalent. */
8379 template_args_equal (tree ot
, tree nt
, bool partial_order
/* = false */)
8383 if (nt
== NULL_TREE
|| ot
== NULL_TREE
)
8385 if (nt
== any_targ_node
|| ot
== any_targ_node
)
8388 if (TREE_CODE (nt
) == TREE_VEC
)
8389 /* For member templates */
8390 return TREE_CODE (ot
) == TREE_VEC
&& comp_template_args (ot
, nt
);
8391 else if (PACK_EXPANSION_P (ot
))
8392 return (PACK_EXPANSION_P (nt
)
8393 && template_args_equal (PACK_EXPANSION_PATTERN (ot
),
8394 PACK_EXPANSION_PATTERN (nt
))
8395 && template_args_equal (PACK_EXPANSION_EXTRA_ARGS (ot
),
8396 PACK_EXPANSION_EXTRA_ARGS (nt
)));
8397 else if (ARGUMENT_PACK_P (ot
))
8402 if (!ARGUMENT_PACK_P (nt
))
8405 opack
= ARGUMENT_PACK_ARGS (ot
);
8406 npack
= ARGUMENT_PACK_ARGS (nt
);
8407 len
= TREE_VEC_LENGTH (opack
);
8408 if (TREE_VEC_LENGTH (npack
) != len
)
8410 for (i
= 0; i
< len
; ++i
)
8411 if (!template_args_equal (TREE_VEC_ELT (opack
, i
),
8412 TREE_VEC_ELT (npack
, i
)))
8416 else if (ot
&& TREE_CODE (ot
) == ARGUMENT_PACK_SELECT
)
8418 else if (TYPE_P (nt
))
8422 /* Don't treat an alias template specialization with dependent
8423 arguments as equivalent to its underlying type when used as a
8424 template argument; we need them to be distinct so that we
8425 substitute into the specialization arguments at instantiation
8426 time. And aliases can't be equivalent without being ==, so
8427 we don't need to look any deeper.
8429 During partial ordering, however, we need to treat them normally so
8430 that we can order uses of the same alias with different
8431 cv-qualification (79960). */
8433 && (TYPE_ALIAS_P (nt
) || TYPE_ALIAS_P (ot
)))
8436 return same_type_p (ot
, nt
);
8438 else if (TREE_CODE (ot
) == TREE_VEC
|| TYPE_P (ot
))
8442 /* Try to treat a template non-type argument that has been converted
8443 to the parameter type as equivalent to one that hasn't yet. */
8444 for (enum tree_code code1
= TREE_CODE (ot
);
8445 CONVERT_EXPR_CODE_P (code1
)
8446 || code1
== NON_LVALUE_EXPR
;
8447 code1
= TREE_CODE (ot
))
8448 ot
= TREE_OPERAND (ot
, 0);
8449 for (enum tree_code code2
= TREE_CODE (nt
);
8450 CONVERT_EXPR_CODE_P (code2
)
8451 || code2
== NON_LVALUE_EXPR
;
8452 code2
= TREE_CODE (nt
))
8453 nt
= TREE_OPERAND (nt
, 0);
8455 return cp_tree_equal (ot
, nt
);
8459 /* Returns 1 iff the OLDARGS and NEWARGS are in fact identical sets of
8460 template arguments. Returns 0 otherwise, and updates OLDARG_PTR and
8461 NEWARG_PTR with the offending arguments if they are non-NULL. */
8464 comp_template_args (tree oldargs
, tree newargs
,
8465 tree
*oldarg_ptr
, tree
*newarg_ptr
,
8470 if (oldargs
== newargs
)
8473 if (!oldargs
|| !newargs
)
8476 if (TREE_VEC_LENGTH (oldargs
) != TREE_VEC_LENGTH (newargs
))
8479 for (i
= 0; i
< TREE_VEC_LENGTH (oldargs
); ++i
)
8481 tree nt
= TREE_VEC_ELT (newargs
, i
);
8482 tree ot
= TREE_VEC_ELT (oldargs
, i
);
8484 if (! template_args_equal (ot
, nt
, partial_order
))
8486 if (oldarg_ptr
!= NULL
)
8488 if (newarg_ptr
!= NULL
)
8497 comp_template_args_porder (tree oargs
, tree nargs
)
8499 return comp_template_args (oargs
, nargs
, NULL
, NULL
, true);
8503 add_pending_template (tree d
)
8505 tree ti
= (TYPE_P (d
)
8506 ? CLASSTYPE_TEMPLATE_INFO (d
)
8507 : DECL_TEMPLATE_INFO (d
));
8508 struct pending_template
*pt
;
8511 if (TI_PENDING_TEMPLATE_FLAG (ti
))
8514 /* We are called both from instantiate_decl, where we've already had a
8515 tinst_level pushed, and instantiate_template, where we haven't.
8517 level
= !current_tinst_level
|| current_tinst_level
->decl
!= d
;
8520 push_tinst_level (d
);
8522 pt
= ggc_alloc
<pending_template
> ();
8524 pt
->tinst
= current_tinst_level
;
8525 if (last_pending_template
)
8526 last_pending_template
->next
= pt
;
8528 pending_templates
= pt
;
8530 last_pending_template
= pt
;
8532 TI_PENDING_TEMPLATE_FLAG (ti
) = 1;
8539 /* Return a TEMPLATE_ID_EXPR corresponding to the indicated FNS and
8540 ARGLIST. Valid choices for FNS are given in the cp-tree.def
8541 documentation for TEMPLATE_ID_EXPR. */
8544 lookup_template_function (tree fns
, tree arglist
)
8548 if (fns
== error_mark_node
|| arglist
== error_mark_node
)
8549 return error_mark_node
;
8551 gcc_assert (!arglist
|| TREE_CODE (arglist
) == TREE_VEC
);
8553 if (!is_overloaded_fn (fns
) && !identifier_p (fns
))
8555 error ("%q#D is not a function template", fns
);
8556 return error_mark_node
;
8559 if (BASELINK_P (fns
))
8561 BASELINK_FUNCTIONS (fns
) = build2 (TEMPLATE_ID_EXPR
,
8563 BASELINK_FUNCTIONS (fns
),
8568 type
= TREE_TYPE (fns
);
8569 if (TREE_CODE (fns
) == OVERLOAD
|| !type
)
8570 type
= unknown_type_node
;
8572 return build2 (TEMPLATE_ID_EXPR
, type
, fns
, arglist
);
8575 /* Within the scope of a template class S<T>, the name S gets bound
8576 (in build_self_reference) to a TYPE_DECL for the class, not a
8577 TEMPLATE_DECL. If DECL is a TYPE_DECL for current_class_type,
8578 or one of its enclosing classes, and that type is a template,
8579 return the associated TEMPLATE_DECL. Otherwise, the original
8582 Also handle the case when DECL is a TREE_LIST of ambiguous
8583 injected-class-names from different bases. */
8586 maybe_get_template_decl_from_type_decl (tree decl
)
8588 if (decl
== NULL_TREE
)
8591 /* DR 176: A lookup that finds an injected-class-name (10.2
8592 [class.member.lookup]) can result in an ambiguity in certain cases
8593 (for example, if it is found in more than one base class). If all of
8594 the injected-class-names that are found refer to specializations of
8595 the same class template, and if the name is followed by a
8596 template-argument-list, the reference refers to the class template
8597 itself and not a specialization thereof, and is not ambiguous. */
8598 if (TREE_CODE (decl
) == TREE_LIST
)
8600 tree t
, tmpl
= NULL_TREE
;
8601 for (t
= decl
; t
; t
= TREE_CHAIN (t
))
8603 tree elt
= maybe_get_template_decl_from_type_decl (TREE_VALUE (t
));
8606 else if (tmpl
!= elt
)
8609 if (tmpl
&& t
== NULL_TREE
)
8615 return (decl
!= NULL_TREE
8616 && DECL_SELF_REFERENCE_P (decl
)
8617 && CLASSTYPE_TEMPLATE_INFO (TREE_TYPE (decl
)))
8618 ? CLASSTYPE_TI_TEMPLATE (TREE_TYPE (decl
)) : decl
;
8621 /* Given an IDENTIFIER_NODE (or type TEMPLATE_DECL) and a chain of
8622 parameters, find the desired type.
8624 D1 is the PTYPENAME terminal, and ARGLIST is the list of arguments.
8626 IN_DECL, if non-NULL, is the template declaration we are trying to
8629 If ENTERING_SCOPE is nonzero, we are about to enter the scope of
8630 the class we are looking up.
8632 Issue error and warning messages under control of COMPLAIN.
8634 If the template class is really a local class in a template
8635 function, then the FUNCTION_CONTEXT is the function in which it is
8638 ??? Note that this function is currently called *twice* for each
8639 template-id: the first time from the parser, while creating the
8640 incomplete type (finish_template_type), and the second type during the
8641 real instantiation (instantiate_template_class). This is surely something
8642 that we want to avoid. It also causes some problems with argument
8643 coercion (see convert_nontype_argument for more information on this). */
8646 lookup_template_class_1 (tree d1
, tree arglist
, tree in_decl
, tree context
,
8647 int entering_scope
, tsubst_flags_t complain
)
8649 tree templ
= NULL_TREE
, parmlist
;
8656 if (identifier_p (d1
))
8658 tree value
= innermost_non_namespace_value (d1
);
8659 if (value
&& DECL_TEMPLATE_TEMPLATE_PARM_P (value
))
8664 push_decl_namespace (context
);
8665 templ
= lookup_name (d1
);
8666 templ
= maybe_get_template_decl_from_type_decl (templ
);
8668 pop_decl_namespace ();
8671 context
= DECL_CONTEXT (templ
);
8673 else if (TREE_CODE (d1
) == TYPE_DECL
&& MAYBE_CLASS_TYPE_P (TREE_TYPE (d1
)))
8675 tree type
= TREE_TYPE (d1
);
8677 /* If we are declaring a constructor, say A<T>::A<T>, we will get
8678 an implicit typename for the second A. Deal with it. */
8679 if (TREE_CODE (type
) == TYPENAME_TYPE
&& TREE_TYPE (type
))
8680 type
= TREE_TYPE (type
);
8682 if (CLASSTYPE_TEMPLATE_INFO (type
))
8684 templ
= CLASSTYPE_TI_TEMPLATE (type
);
8685 d1
= DECL_NAME (templ
);
8688 else if (TREE_CODE (d1
) == ENUMERAL_TYPE
8689 || (TYPE_P (d1
) && MAYBE_CLASS_TYPE_P (d1
)))
8691 templ
= TYPE_TI_TEMPLATE (d1
);
8692 d1
= DECL_NAME (templ
);
8694 else if (DECL_TYPE_TEMPLATE_P (d1
))
8697 d1
= DECL_NAME (templ
);
8698 context
= DECL_CONTEXT (templ
);
8700 else if (DECL_TEMPLATE_TEMPLATE_PARM_P (d1
))
8703 d1
= DECL_NAME (templ
);
8706 /* Issue an error message if we didn't find a template. */
8709 if (complain
& tf_error
)
8710 error ("%qT is not a template", d1
);
8711 return error_mark_node
;
8714 if (TREE_CODE (templ
) != TEMPLATE_DECL
8715 /* Make sure it's a user visible template, if it was named by
8717 || ((complain
& tf_user
) && !DECL_TEMPLATE_PARM_P (templ
)
8718 && !PRIMARY_TEMPLATE_P (templ
)))
8720 if (complain
& tf_error
)
8722 error ("non-template type %qT used as a template", d1
);
8724 error ("for template declaration %q+D", in_decl
);
8726 return error_mark_node
;
8729 complain
&= ~tf_user
;
8731 /* An alias that just changes the name of a template is equivalent to the
8732 other template, so if any of the arguments are pack expansions, strip
8733 the alias to avoid problems with a pack expansion passed to a non-pack
8734 alias template parameter (DR 1430). */
8735 if (pack_expansion_args_count (INNERMOST_TEMPLATE_ARGS (arglist
)))
8736 templ
= get_underlying_template (templ
);
8738 if (DECL_TEMPLATE_TEMPLATE_PARM_P (templ
))
8741 tree arglist2
= coerce_template_args_for_ttp (templ
, arglist
, complain
);
8742 if (arglist2
== error_mark_node
8743 || (!uses_template_parms (arglist2
)
8744 && check_instantiated_args (templ
, arglist2
, complain
)))
8745 return error_mark_node
;
8747 parm
= bind_template_template_parm (TREE_TYPE (templ
), arglist2
);
8752 tree template_type
= TREE_TYPE (templ
);
8755 tree found
= NULL_TREE
;
8758 int is_dependent_type
;
8759 int use_partial_inst_tmpl
= false;
8761 if (template_type
== error_mark_node
)
8762 /* An error occurred while building the template TEMPL, and a
8763 diagnostic has most certainly been emitted for that
8764 already. Let's propagate that error. */
8765 return error_mark_node
;
8767 gen_tmpl
= most_general_template (templ
);
8768 parmlist
= DECL_TEMPLATE_PARMS (gen_tmpl
);
8769 parm_depth
= TMPL_PARMS_DEPTH (parmlist
);
8770 arg_depth
= TMPL_ARGS_DEPTH (arglist
);
8772 if (arg_depth
== 1 && parm_depth
> 1)
8774 /* We've been given an incomplete set of template arguments.
8777 template <class T> struct S1 {
8778 template <class U> struct S2 {};
8779 template <class U> struct S2<U*> {};
8782 we will be called with an ARGLIST of `U*', but the
8783 TEMPLATE will be `template <class T> template
8784 <class U> struct S1<T>::S2'. We must fill in the missing
8786 tree ti
= TYPE_TEMPLATE_INFO_MAYBE_ALIAS (TREE_TYPE (templ
));
8787 arglist
= add_outermost_template_args (TI_ARGS (ti
), arglist
);
8788 arg_depth
= TMPL_ARGS_DEPTH (arglist
);
8791 /* Now we should have enough arguments. */
8792 gcc_assert (parm_depth
== arg_depth
);
8794 /* From here on, we're only interested in the most general
8797 /* Calculate the BOUND_ARGS. These will be the args that are
8798 actually tsubst'd into the definition to create the
8800 arglist
= coerce_innermost_template_parms (parmlist
, arglist
, gen_tmpl
,
8802 /*require_all_args=*/true,
8803 /*use_default_args=*/true);
8805 if (arglist
== error_mark_node
)
8806 /* We were unable to bind the arguments. */
8807 return error_mark_node
;
8809 /* In the scope of a template class, explicit references to the
8810 template class refer to the type of the template, not any
8811 instantiation of it. For example, in:
8813 template <class T> class C { void f(C<T>); }
8815 the `C<T>' is just the same as `C'. Outside of the
8816 class, however, such a reference is an instantiation. */
8818 || !PRIMARY_TEMPLATE_P (gen_tmpl
)
8819 || currently_open_class (template_type
))
8821 tree tinfo
= TYPE_TEMPLATE_INFO (template_type
);
8823 if (tinfo
&& comp_template_args (TI_ARGS (tinfo
), arglist
))
8824 return template_type
;
8827 /* If we already have this specialization, return it. */
8828 elt
.tmpl
= gen_tmpl
;
8830 elt
.spec
= NULL_TREE
;
8831 hash
= spec_hasher::hash (&elt
);
8832 entry
= type_specializations
->find_with_hash (&elt
, hash
);
8837 /* If the the template's constraints are not satisfied,
8838 then we cannot form a valid type.
8840 Note that the check is deferred until after the hash
8841 lookup. This prevents redundant checks on previously
8842 instantiated specializations. */
8843 if (flag_concepts
&& !constraints_satisfied_p (gen_tmpl
, arglist
))
8845 if (complain
& tf_error
)
8847 error ("template constraint failure");
8848 diagnose_constraints (input_location
, gen_tmpl
, arglist
);
8850 return error_mark_node
;
8853 is_dependent_type
= uses_template_parms (arglist
);
8855 /* If the deduced arguments are invalid, then the binding
8857 if (!is_dependent_type
8858 && check_instantiated_args (gen_tmpl
,
8859 INNERMOST_TEMPLATE_ARGS (arglist
),
8861 return error_mark_node
;
8863 if (!is_dependent_type
8864 && !PRIMARY_TEMPLATE_P (gen_tmpl
)
8865 && !LAMBDA_TYPE_P (TREE_TYPE (gen_tmpl
))
8866 && TREE_CODE (CP_DECL_CONTEXT (gen_tmpl
)) == NAMESPACE_DECL
)
8868 found
= xref_tag_from_type (TREE_TYPE (gen_tmpl
),
8869 DECL_NAME (gen_tmpl
),
8870 /*tag_scope=*/ts_global
);
8874 context
= tsubst (DECL_CONTEXT (gen_tmpl
), arglist
,
8876 if (context
== error_mark_node
)
8877 return error_mark_node
;
8880 context
= global_namespace
;
8882 /* Create the type. */
8883 if (DECL_ALIAS_TEMPLATE_P (gen_tmpl
))
8885 /* The user referred to a specialization of an alias
8886 template represented by GEN_TMPL.
8888 [temp.alias]/2 says:
8890 When a template-id refers to the specialization of an
8891 alias template, it is equivalent to the associated
8892 type obtained by substitution of its
8893 template-arguments for the template-parameters in the
8894 type-id of the alias template. */
8896 t
= tsubst (TREE_TYPE (gen_tmpl
), arglist
, complain
, in_decl
);
8897 /* Note that the call above (by indirectly calling
8898 register_specialization in tsubst_decl) registers the
8899 TYPE_DECL representing the specialization of the alias
8900 template. So next time someone substitutes ARGLIST for
8901 the template parms into the alias template (GEN_TMPL),
8902 she'll get that TYPE_DECL back. */
8904 if (t
== error_mark_node
)
8907 else if (TREE_CODE (template_type
) == ENUMERAL_TYPE
)
8909 if (!is_dependent_type
)
8911 set_current_access_from_decl (TYPE_NAME (template_type
));
8912 t
= start_enum (TYPE_IDENTIFIER (template_type
), NULL_TREE
,
8913 tsubst (ENUM_UNDERLYING_TYPE (template_type
),
8914 arglist
, complain
, in_decl
),
8915 tsubst_attributes (TYPE_ATTRIBUTES (template_type
),
8916 arglist
, complain
, in_decl
),
8917 SCOPED_ENUM_P (template_type
), NULL
);
8919 if (t
== error_mark_node
)
8924 /* We don't want to call start_enum for this type, since
8925 the values for the enumeration constants may involve
8926 template parameters. And, no one should be interested
8927 in the enumeration constants for such a type. */
8928 t
= cxx_make_type (ENUMERAL_TYPE
);
8929 SET_SCOPED_ENUM_P (t
, SCOPED_ENUM_P (template_type
));
8931 SET_OPAQUE_ENUM_P (t
, OPAQUE_ENUM_P (template_type
));
8932 ENUM_FIXED_UNDERLYING_TYPE_P (t
)
8933 = ENUM_FIXED_UNDERLYING_TYPE_P (template_type
);
8935 else if (CLASS_TYPE_P (template_type
))
8937 t
= make_class_type (TREE_CODE (template_type
));
8938 CLASSTYPE_DECLARED_CLASS (t
)
8939 = CLASSTYPE_DECLARED_CLASS (template_type
);
8940 SET_CLASSTYPE_IMPLICIT_INSTANTIATION (t
);
8942 /* A local class. Make sure the decl gets registered properly. */
8943 if (context
== current_function_decl
)
8944 pushtag (DECL_NAME (gen_tmpl
), t
, /*tag_scope=*/ts_current
);
8946 if (comp_template_args (CLASSTYPE_TI_ARGS (template_type
), arglist
))
8947 /* This instantiation is another name for the primary
8948 template type. Set the TYPE_CANONICAL field
8950 TYPE_CANONICAL (t
) = template_type
;
8951 else if (any_template_arguments_need_structural_equality_p (arglist
))
8952 /* Some of the template arguments require structural
8953 equality testing, so this template class requires
8954 structural equality testing. */
8955 SET_TYPE_STRUCTURAL_EQUALITY (t
);
8960 /* If we called start_enum or pushtag above, this information
8961 will already be set up. */
8964 TYPE_CONTEXT (t
) = FROB_CONTEXT (context
);
8966 type_decl
= create_implicit_typedef (DECL_NAME (gen_tmpl
), t
);
8967 DECL_CONTEXT (type_decl
) = TYPE_CONTEXT (t
);
8968 DECL_SOURCE_LOCATION (type_decl
)
8969 = DECL_SOURCE_LOCATION (TYPE_STUB_DECL (template_type
));
8972 type_decl
= TYPE_NAME (t
);
8974 if (CLASS_TYPE_P (template_type
))
8976 TREE_PRIVATE (type_decl
)
8977 = TREE_PRIVATE (TYPE_MAIN_DECL (template_type
));
8978 TREE_PROTECTED (type_decl
)
8979 = TREE_PROTECTED (TYPE_MAIN_DECL (template_type
));
8980 if (CLASSTYPE_VISIBILITY_SPECIFIED (template_type
))
8982 DECL_VISIBILITY_SPECIFIED (type_decl
) = 1;
8983 DECL_VISIBILITY (type_decl
) = CLASSTYPE_VISIBILITY (template_type
);
8987 if (OVERLOAD_TYPE_P (t
)
8988 && !DECL_ALIAS_TEMPLATE_P (gen_tmpl
))
8990 static const char *tags
[] = {"abi_tag", "may_alias"};
8992 for (unsigned ix
= 0; ix
!= 2; ix
++)
8995 = lookup_attribute (tags
[ix
], TYPE_ATTRIBUTES (template_type
));
8999 = tree_cons (TREE_PURPOSE (attributes
),
9000 TREE_VALUE (attributes
),
9001 TYPE_ATTRIBUTES (t
));
9005 /* Let's consider the explicit specialization of a member
9006 of a class template specialization that is implicitly instantiated,
9011 template<class U> struct M {}; //#0
9016 struct S<int>::M<char> //#1
9020 [temp.expl.spec]/4 says this is valid.
9022 In this case, when we write:
9025 M is instantiated from the CLASSTYPE_TI_TEMPLATE of #1, not from
9028 When we encounter #1, we want to store the partial instantiation
9029 of M (template<class T> S<int>::M<T>) in its CLASSTYPE_TI_TEMPLATE.
9031 For all cases other than this "explicit specialization of member of a
9032 class template", we just want to store the most general template into
9033 the CLASSTYPE_TI_TEMPLATE of M.
9035 This case of "explicit specialization of member of a class template"
9037 1/ the enclosing class is an instantiation of, and therefore not
9038 the same as, the context of the most general template, and
9039 2/ we aren't looking at the partial instantiation itself, i.e.
9040 the innermost arguments are not the same as the innermost parms of
9041 the most general template.
9043 So it's only when 1/ and 2/ happens that we want to use the partial
9044 instantiation of the member template in lieu of its most general
9047 if (PRIMARY_TEMPLATE_P (gen_tmpl
)
9048 && TMPL_ARGS_HAVE_MULTIPLE_LEVELS (arglist
)
9049 /* the enclosing class must be an instantiation... */
9050 && CLASS_TYPE_P (context
)
9051 && !same_type_p (context
, DECL_CONTEXT (gen_tmpl
)))
9053 TREE_VEC_LENGTH (arglist
)--;
9054 ++processing_template_decl
;
9055 tree tinfo
= TYPE_TEMPLATE_INFO_MAYBE_ALIAS (TREE_TYPE (gen_tmpl
));
9056 tree partial_inst_args
=
9057 tsubst (INNERMOST_TEMPLATE_ARGS (TI_ARGS (tinfo
)),
9058 arglist
, complain
, NULL_TREE
);
9059 --processing_template_decl
;
9060 TREE_VEC_LENGTH (arglist
)++;
9061 if (partial_inst_args
== error_mark_node
)
9062 return error_mark_node
;
9063 use_partial_inst_tmpl
=
9064 /*...and we must not be looking at the partial instantiation
9066 !comp_template_args (INNERMOST_TEMPLATE_ARGS (arglist
),
9070 if (!use_partial_inst_tmpl
)
9071 /* This case is easy; there are no member templates involved. */
9075 /* This is a full instantiation of a member template. Find
9076 the partial instantiation of which this is an instance. */
9078 /* Temporarily reduce by one the number of levels in the ARGLIST
9079 so as to avoid comparing the last set of arguments. */
9080 TREE_VEC_LENGTH (arglist
)--;
9081 found
= tsubst (gen_tmpl
, arglist
, complain
, NULL_TREE
);
9082 TREE_VEC_LENGTH (arglist
)++;
9083 /* FOUND is either a proper class type, or an alias
9084 template specialization. In the later case, it's a
9085 TYPE_DECL, resulting from the substituting of arguments
9086 for parameters in the TYPE_DECL of the alias template
9087 done earlier. So be careful while getting the template
9089 found
= (TREE_CODE (found
) == TEMPLATE_DECL
9091 : (TREE_CODE (found
) == TYPE_DECL
9092 ? DECL_TI_TEMPLATE (found
)
9093 : CLASSTYPE_TI_TEMPLATE (found
)));
9096 // Build template info for the new specialization.
9097 SET_TYPE_TEMPLATE_INFO (t
, build_template_info (found
, arglist
));
9100 slot
= type_specializations
->find_slot_with_hash (&elt
, hash
, INSERT
);
9101 entry
= ggc_alloc
<spec_entry
> ();
9105 /* Note this use of the partial instantiation so we can check it
9106 later in maybe_process_partial_specialization. */
9107 DECL_TEMPLATE_INSTANTIATIONS (found
)
9108 = tree_cons (arglist
, t
,
9109 DECL_TEMPLATE_INSTANTIATIONS (found
));
9111 if (TREE_CODE (template_type
) == ENUMERAL_TYPE
&& !is_dependent_type
9112 && !DECL_ALIAS_TEMPLATE_P (gen_tmpl
))
9113 /* Now that the type has been registered on the instantiations
9114 list, we set up the enumerators. Because the enumeration
9115 constants may involve the enumeration type itself, we make
9116 sure to register the type first, and then create the
9117 constants. That way, doing tsubst_expr for the enumeration
9118 constants won't result in recursive calls here; we'll find
9119 the instantiation and exit above. */
9120 tsubst_enum (template_type
, t
, arglist
);
9122 if (CLASS_TYPE_P (template_type
) && is_dependent_type
)
9123 /* If the type makes use of template parameters, the
9124 code that generates debugging information will crash. */
9125 DECL_IGNORED_P (TYPE_MAIN_DECL (t
)) = 1;
9127 /* Possibly limit visibility based on template args. */
9128 TREE_PUBLIC (type_decl
) = 1;
9129 determine_visibility (type_decl
);
9131 inherit_targ_abi_tags (t
);
9137 /* Wrapper for lookup_template_class_1. */
9140 lookup_template_class (tree d1
, tree arglist
, tree in_decl
, tree context
,
9141 int entering_scope
, tsubst_flags_t complain
)
9144 timevar_push (TV_TEMPLATE_INST
);
9145 ret
= lookup_template_class_1 (d1
, arglist
, in_decl
, context
,
9146 entering_scope
, complain
);
9147 timevar_pop (TV_TEMPLATE_INST
);
9151 /* Return a TEMPLATE_ID_EXPR for the given variable template and ARGLIST. */
9154 lookup_template_variable (tree templ
, tree arglist
)
9156 /* The type of the expression is NULL_TREE since the template-id could refer
9157 to an explicit or partial specialization. */
9158 tree type
= NULL_TREE
;
9159 if (flag_concepts
&& variable_concept_p (templ
))
9160 /* Except that concepts are always bool. */
9161 type
= boolean_type_node
;
9162 return build2 (TEMPLATE_ID_EXPR
, type
, templ
, arglist
);
9165 /* Instantiate a variable declaration from a TEMPLATE_ID_EXPR for use. */
9168 finish_template_variable (tree var
, tsubst_flags_t complain
)
9170 tree templ
= TREE_OPERAND (var
, 0);
9171 tree arglist
= TREE_OPERAND (var
, 1);
9173 /* We never want to return a VAR_DECL for a variable concept, since they
9174 aren't instantiated. In a template, leave the TEMPLATE_ID_EXPR alone. */
9175 bool concept_p
= flag_concepts
&& variable_concept_p (templ
);
9176 if (concept_p
&& processing_template_decl
)
9179 tree tmpl_args
= DECL_TI_ARGS (DECL_TEMPLATE_RESULT (templ
));
9180 arglist
= add_outermost_template_args (tmpl_args
, arglist
);
9182 templ
= most_general_template (templ
);
9183 tree parms
= DECL_TEMPLATE_PARMS (templ
);
9184 arglist
= coerce_innermost_template_parms (parms
, arglist
, templ
, complain
,
9186 /*use_default*/true);
9188 if (flag_concepts
&& !constraints_satisfied_p (templ
, arglist
))
9190 if (complain
& tf_error
)
9192 error ("use of invalid variable template %qE", var
);
9193 diagnose_constraints (location_of (var
), templ
, arglist
);
9195 return error_mark_node
;
9198 /* If a template-id refers to a specialization of a variable
9199 concept, then the expression is true if and only if the
9200 concept's constraints are satisfied by the given template
9203 NOTE: This is an extension of Concepts Lite TS that
9204 allows constraints to be used in expressions. */
9207 tree decl
= DECL_TEMPLATE_RESULT (templ
);
9208 return evaluate_variable_concept (decl
, arglist
);
9211 return instantiate_template (templ
, arglist
, complain
);
9214 /* Construct a TEMPLATE_ID_EXPR for the given variable template TEMPL having
9215 TARGS template args, and instantiate it if it's not dependent. */
9218 lookup_and_finish_template_variable (tree templ
, tree targs
,
9219 tsubst_flags_t complain
)
9221 templ
= lookup_template_variable (templ
, targs
);
9222 if (!any_dependent_template_arguments_p (targs
))
9224 templ
= finish_template_variable (templ
, complain
);
9228 return convert_from_reference (templ
);
9237 /* True when we should also visit template parameters that occur in
9238 non-deduced contexts. */
9239 bool include_nondeduced_p
;
9240 hash_set
<tree
> *visited
;
9243 /* Called from for_each_template_parm via walk_tree. */
9246 for_each_template_parm_r (tree
*tp
, int *walk_subtrees
, void *d
)
9249 struct pair_fn_data
*pfd
= (struct pair_fn_data
*) d
;
9250 tree_fn_t fn
= pfd
->fn
;
9251 void *data
= pfd
->data
;
9252 tree result
= NULL_TREE
;
9254 #define WALK_SUBTREE(NODE) \
9257 result = for_each_template_parm (NODE, fn, data, pfd->visited, \
9258 pfd->include_nondeduced_p, \
9260 if (result) goto out; \
9264 if (pfd
->any_fn
&& (*pfd
->any_fn
)(t
, data
))
9268 && (pfd
->include_nondeduced_p
|| TREE_CODE (t
) != TYPENAME_TYPE
))
9269 WALK_SUBTREE (TYPE_CONTEXT (t
));
9271 switch (TREE_CODE (t
))
9274 if (TYPE_PTRMEMFUNC_P (t
))
9280 if (!TYPE_TEMPLATE_INFO (t
))
9283 WALK_SUBTREE (TYPE_TI_ARGS (t
));
9287 WALK_SUBTREE (TYPE_MIN_VALUE (t
));
9288 WALK_SUBTREE (TYPE_MAX_VALUE (t
));
9292 /* Since we're not going to walk subtrees, we have to do this
9294 WALK_SUBTREE (TYPE_METHOD_BASETYPE (t
));
9298 /* Check the return type. */
9299 WALK_SUBTREE (TREE_TYPE (t
));
9301 /* Check the parameter types. Since default arguments are not
9302 instantiated until they are needed, the TYPE_ARG_TYPES may
9303 contain expressions that involve template parameters. But,
9304 no-one should be looking at them yet. And, once they're
9305 instantiated, they don't contain template parameters, so
9306 there's no point in looking at them then, either. */
9310 for (parm
= TYPE_ARG_TYPES (t
); parm
; parm
= TREE_CHAIN (parm
))
9311 WALK_SUBTREE (TREE_VALUE (parm
));
9313 /* Since we've already handled the TYPE_ARG_TYPES, we don't
9314 want walk_tree walking into them itself. */
9318 if (flag_noexcept_type
)
9320 tree spec
= TYPE_RAISES_EXCEPTIONS (t
);
9322 WALK_SUBTREE (TREE_PURPOSE (spec
));
9327 case UNDERLYING_TYPE
:
9328 if (pfd
->include_nondeduced_p
9329 && for_each_template_parm (TYPE_VALUES_RAW (t
), fn
, data
,
9331 pfd
->include_nondeduced_p
,
9333 return error_mark_node
;
9338 if (DECL_LANG_SPECIFIC (t
) && DECL_TEMPLATE_INFO (t
))
9339 WALK_SUBTREE (DECL_TI_ARGS (t
));
9344 if (TREE_CODE (t
) == CONST_DECL
&& DECL_TEMPLATE_PARM_P (t
))
9345 WALK_SUBTREE (DECL_INITIAL (t
));
9346 if (DECL_CONTEXT (t
)
9347 && pfd
->include_nondeduced_p
)
9348 WALK_SUBTREE (DECL_CONTEXT (t
));
9351 case BOUND_TEMPLATE_TEMPLATE_PARM
:
9352 /* Record template parameters such as `T' inside `TT<T>'. */
9353 WALK_SUBTREE (TYPE_TI_ARGS (t
));
9356 case TEMPLATE_TEMPLATE_PARM
:
9357 case TEMPLATE_TYPE_PARM
:
9358 case TEMPLATE_PARM_INDEX
:
9359 if (fn
&& (*fn
)(t
, data
))
9366 /* A template template parameter is encountered. */
9367 if (DECL_TEMPLATE_TEMPLATE_PARM_P (t
))
9368 WALK_SUBTREE (TREE_TYPE (t
));
9370 /* Already substituted template template parameter */
9375 /* A template-id in a TYPENAME_TYPE might be a deduced context after
9376 partial instantiation. */
9377 WALK_SUBTREE (TYPENAME_TYPE_FULLNAME (t
));
9381 if (TREE_TYPE (t
) && TYPE_PTRMEMFUNC_P (TREE_TYPE (t
))
9382 && pfd
->include_nondeduced_p
)
9383 WALK_SUBTREE (TYPE_PTRMEMFUNC_FN_TYPE (TREE_TYPE (t
)));
9388 /* If there's no type, then this thing must be some expression
9389 involving template parameters. */
9390 if (!fn
&& !TREE_TYPE (t
))
9391 return error_mark_node
;
9396 case IMPLICIT_CONV_EXPR
:
9397 case REINTERPRET_CAST_EXPR
:
9398 case CONST_CAST_EXPR
:
9399 case STATIC_CAST_EXPR
:
9400 case DYNAMIC_CAST_EXPR
:
9404 case PSEUDO_DTOR_EXPR
:
9406 return error_mark_node
;
9415 /* We didn't find any template parameters we liked. */
9420 /* For each TEMPLATE_TYPE_PARM, TEMPLATE_TEMPLATE_PARM,
9421 BOUND_TEMPLATE_TEMPLATE_PARM or TEMPLATE_PARM_INDEX in T,
9422 call FN with the parameter and the DATA.
9423 If FN returns nonzero, the iteration is terminated, and
9424 for_each_template_parm returns 1. Otherwise, the iteration
9425 continues. If FN never returns a nonzero value, the value
9426 returned by for_each_template_parm is 0. If FN is NULL, it is
9427 considered to be the function which always returns 1.
9429 If INCLUDE_NONDEDUCED_P, then this routine will also visit template
9430 parameters that occur in non-deduced contexts. When false, only
9431 visits those template parameters that can be deduced. */
9434 for_each_template_parm (tree t
, tree_fn_t fn
, void* data
,
9435 hash_set
<tree
> *visited
,
9436 bool include_nondeduced_p
,
9439 struct pair_fn_data pfd
;
9444 pfd
.any_fn
= any_fn
;
9446 pfd
.include_nondeduced_p
= include_nondeduced_p
;
9448 /* Walk the tree. (Conceptually, we would like to walk without
9449 duplicates, but for_each_template_parm_r recursively calls
9450 for_each_template_parm, so we would need to reorganize a fair
9451 bit to use walk_tree_without_duplicates, so we keep our own
9454 pfd
.visited
= visited
;
9456 pfd
.visited
= new hash_set
<tree
>;
9457 result
= cp_walk_tree (&t
,
9458 for_each_template_parm_r
,
9472 /* Returns true if T depends on any template parameter. */
9475 uses_template_parms (tree t
)
9481 int saved_processing_template_decl
;
9483 saved_processing_template_decl
= processing_template_decl
;
9484 if (!saved_processing_template_decl
)
9485 processing_template_decl
= 1;
9487 dependent_p
= dependent_type_p (t
);
9488 else if (TREE_CODE (t
) == TREE_VEC
)
9489 dependent_p
= any_dependent_template_arguments_p (t
);
9490 else if (TREE_CODE (t
) == TREE_LIST
)
9491 dependent_p
= (uses_template_parms (TREE_VALUE (t
))
9492 || uses_template_parms (TREE_CHAIN (t
)));
9493 else if (TREE_CODE (t
) == TYPE_DECL
)
9494 dependent_p
= dependent_type_p (TREE_TYPE (t
));
9497 || TREE_CODE (t
) == TEMPLATE_PARM_INDEX
9498 || TREE_CODE (t
) == OVERLOAD
9501 || TREE_CODE (t
) == TRAIT_EXPR
9502 || TREE_CODE (t
) == CONSTRUCTOR
9503 || CONSTANT_CLASS_P (t
))
9504 dependent_p
= (type_dependent_expression_p (t
)
9505 || value_dependent_expression_p (t
));
9508 gcc_assert (t
== error_mark_node
);
9509 dependent_p
= false;
9512 processing_template_decl
= saved_processing_template_decl
;
9517 /* Returns true iff current_function_decl is an incompletely instantiated
9518 template. Useful instead of processing_template_decl because the latter
9519 is set to 0 during instantiate_non_dependent_expr. */
9522 in_template_function (void)
9524 tree fn
= current_function_decl
;
9526 ++processing_template_decl
;
9527 ret
= (fn
&& DECL_LANG_SPECIFIC (fn
)
9528 && DECL_TEMPLATE_INFO (fn
)
9529 && any_dependent_template_arguments_p (DECL_TI_ARGS (fn
)));
9530 --processing_template_decl
;
9534 /* Returns true if T depends on any template parameter with level LEVEL. */
9537 uses_template_parms_level (tree t
, int level
)
9539 return for_each_template_parm (t
, template_parm_this_level_p
, &level
, NULL
,
9540 /*include_nondeduced_p=*/true);
9543 /* Returns true if the signature of DECL depends on any template parameter from
9544 its enclosing class. */
9547 uses_outer_template_parms (tree decl
)
9549 int depth
= template_class_depth (CP_DECL_CONTEXT (decl
));
9552 if (for_each_template_parm (TREE_TYPE (decl
), template_parm_outer_level
,
9553 &depth
, NULL
, /*include_nondeduced_p=*/true))
9555 if (PRIMARY_TEMPLATE_P (decl
)
9556 && for_each_template_parm (INNERMOST_TEMPLATE_PARMS
9557 (DECL_TEMPLATE_PARMS (decl
)),
9558 template_parm_outer_level
,
9559 &depth
, NULL
, /*include_nondeduced_p=*/true))
9561 tree ci
= get_constraints (decl
);
9563 ci
= CI_ASSOCIATED_CONSTRAINTS (ci
);
9564 if (ci
&& for_each_template_parm (ci
, template_parm_outer_level
,
9565 &depth
, NULL
, /*nondeduced*/true))
9570 /* Returns TRUE iff INST is an instantiation we don't need to do in an
9571 ill-formed translation unit, i.e. a variable or function that isn't
9572 usable in a constant expression. */
9575 neglectable_inst_p (tree d
)
9578 && !undeduced_auto_decl (d
)
9579 && !(TREE_CODE (d
) == FUNCTION_DECL
? DECL_DECLARED_CONSTEXPR_P (d
)
9580 : decl_maybe_constant_var_p (d
)));
9583 /* Returns TRUE iff we should refuse to instantiate DECL because it's
9584 neglectable and instantiated from within an erroneous instantiation. */
9587 limit_bad_template_recursion (tree decl
)
9589 struct tinst_level
*lev
= current_tinst_level
;
9590 int errs
= errorcount
+ sorrycount
;
9591 if (lev
== NULL
|| errs
== 0 || !neglectable_inst_p (decl
))
9594 for (; lev
; lev
= lev
->next
)
9595 if (neglectable_inst_p (lev
->decl
))
9598 return (lev
&& errs
> lev
->errors
);
9601 static int tinst_depth
;
9602 extern int max_tinst_depth
;
9605 static GTY(()) struct tinst_level
*last_error_tinst_level
;
9607 /* We're starting to instantiate D; record the template instantiation context
9608 for diagnostics and to restore it later. */
9611 push_tinst_level (tree d
)
9613 return push_tinst_level_loc (d
, input_location
);
9616 /* We're starting to instantiate D; record the template instantiation context
9617 at LOC for diagnostics and to restore it later. */
9620 push_tinst_level_loc (tree d
, location_t loc
)
9622 struct tinst_level
*new_level
;
9624 if (tinst_depth
>= max_tinst_depth
)
9626 /* Tell error.c not to try to instantiate any templates. */
9628 fatal_error (input_location
,
9629 "template instantiation depth exceeds maximum of %d"
9630 " (use -ftemplate-depth= to increase the maximum)",
9635 /* If the current instantiation caused problems, don't let it instantiate
9636 anything else. Do allow deduction substitution and decls usable in
9637 constant expressions. */
9638 if (limit_bad_template_recursion (d
))
9641 /* When not -quiet, dump template instantiations other than functions, since
9642 announce_function will take care of those. */
9644 && TREE_CODE (d
) != TREE_LIST
9645 && TREE_CODE (d
) != FUNCTION_DECL
)
9646 fprintf (stderr
, " %s", decl_as_string (d
, TFF_DECL_SPECIFIERS
));
9648 new_level
= ggc_alloc
<tinst_level
> ();
9649 new_level
->decl
= d
;
9650 new_level
->locus
= loc
;
9651 new_level
->errors
= errorcount
+sorrycount
;
9652 new_level
->in_system_header_p
= in_system_header_at (input_location
);
9653 new_level
->next
= current_tinst_level
;
9654 current_tinst_level
= new_level
;
9657 if (GATHER_STATISTICS
&& (tinst_depth
> depth_reached
))
9658 depth_reached
= tinst_depth
;
9663 /* We're done instantiating this template; return to the instantiation
9667 pop_tinst_level (void)
9669 /* Restore the filename and line number stashed away when we started
9670 this instantiation. */
9671 input_location
= current_tinst_level
->locus
;
9672 current_tinst_level
= current_tinst_level
->next
;
9676 /* We're instantiating a deferred template; restore the template
9677 instantiation context in which the instantiation was requested, which
9678 is one step out from LEVEL. Return the corresponding DECL or TYPE. */
9681 reopen_tinst_level (struct tinst_level
*level
)
9683 struct tinst_level
*t
;
9686 for (t
= level
; t
; t
= t
->next
)
9689 current_tinst_level
= level
;
9691 if (current_tinst_level
)
9692 current_tinst_level
->errors
= errorcount
+sorrycount
;
9696 /* Returns the TINST_LEVEL which gives the original instantiation
9699 struct tinst_level
*
9700 outermost_tinst_level (void)
9702 struct tinst_level
*level
= current_tinst_level
;
9705 level
= level
->next
;
9709 /* DECL is a friend FUNCTION_DECL or TEMPLATE_DECL. ARGS is the
9710 vector of template arguments, as for tsubst.
9712 Returns an appropriate tsubst'd friend declaration. */
9715 tsubst_friend_function (tree decl
, tree args
)
9719 if (TREE_CODE (decl
) == FUNCTION_DECL
9720 && DECL_TEMPLATE_INSTANTIATION (decl
)
9721 && TREE_CODE (DECL_TI_TEMPLATE (decl
)) != TEMPLATE_DECL
)
9722 /* This was a friend declared with an explicit template
9723 argument list, e.g.:
9727 to indicate that f was a template instantiation, not a new
9728 function declaration. Now, we have to figure out what
9729 instantiation of what template. */
9731 tree template_id
, arglist
, fns
;
9734 tree ns
= decl_namespace_context (TYPE_MAIN_DECL (current_class_type
));
9736 /* Friend functions are looked up in the containing namespace scope.
9737 We must enter that scope, to avoid finding member functions of the
9738 current class with same name. */
9739 push_nested_namespace (ns
);
9740 fns
= tsubst_expr (DECL_TI_TEMPLATE (decl
), args
,
9741 tf_warning_or_error
, NULL_TREE
,
9742 /*integral_constant_expression_p=*/false);
9743 pop_nested_namespace (ns
);
9744 arglist
= tsubst (DECL_TI_ARGS (decl
), args
,
9745 tf_warning_or_error
, NULL_TREE
);
9746 template_id
= lookup_template_function (fns
, arglist
);
9748 new_friend
= tsubst (decl
, args
, tf_warning_or_error
, NULL_TREE
);
9749 tmpl
= determine_specialization (template_id
, new_friend
,
9751 /*need_member_template=*/0,
9752 TREE_VEC_LENGTH (args
),
9754 return instantiate_template (tmpl
, new_args
, tf_error
);
9757 new_friend
= tsubst (decl
, args
, tf_warning_or_error
, NULL_TREE
);
9759 /* The NEW_FRIEND will look like an instantiation, to the
9760 compiler, but is not an instantiation from the point of view of
9761 the language. For example, we might have had:
9763 template <class T> struct S {
9764 template <class U> friend void f(T, U);
9767 Then, in S<int>, template <class U> void f(int, U) is not an
9768 instantiation of anything. */
9769 if (new_friend
== error_mark_node
)
9770 return error_mark_node
;
9772 DECL_USE_TEMPLATE (new_friend
) = 0;
9773 if (TREE_CODE (decl
) == TEMPLATE_DECL
)
9775 DECL_USE_TEMPLATE (DECL_TEMPLATE_RESULT (new_friend
)) = 0;
9776 DECL_SAVED_TREE (DECL_TEMPLATE_RESULT (new_friend
))
9777 = DECL_SAVED_TREE (DECL_TEMPLATE_RESULT (decl
));
9780 /* The mangled name for the NEW_FRIEND is incorrect. The function
9781 is not a template instantiation and should not be mangled like
9782 one. Therefore, we forget the mangling here; we'll recompute it
9783 later if we need it. */
9784 if (TREE_CODE (new_friend
) != TEMPLATE_DECL
)
9786 SET_DECL_RTL (new_friend
, NULL
);
9787 SET_DECL_ASSEMBLER_NAME (new_friend
, NULL_TREE
);
9790 if (DECL_NAMESPACE_SCOPE_P (new_friend
))
9793 tree new_friend_template_info
;
9794 tree new_friend_result_template_info
;
9796 int new_friend_is_defn
;
9798 /* We must save some information from NEW_FRIEND before calling
9799 duplicate decls since that function will free NEW_FRIEND if
9801 new_friend_template_info
= DECL_TEMPLATE_INFO (new_friend
);
9802 new_friend_is_defn
=
9803 (DECL_INITIAL (DECL_TEMPLATE_RESULT
9804 (template_for_substitution (new_friend
)))
9806 if (TREE_CODE (new_friend
) == TEMPLATE_DECL
)
9808 /* This declaration is a `primary' template. */
9809 DECL_PRIMARY_TEMPLATE (new_friend
) = new_friend
;
9811 new_friend_result_template_info
9812 = DECL_TEMPLATE_INFO (DECL_TEMPLATE_RESULT (new_friend
));
9815 new_friend_result_template_info
= NULL_TREE
;
9817 /* Inside pushdecl_namespace_level, we will push into the
9818 current namespace. However, the friend function should go
9819 into the namespace of the template. */
9820 ns
= decl_namespace_context (new_friend
);
9821 push_nested_namespace (ns
);
9822 old_decl
= pushdecl_namespace_level (new_friend
, /*is_friend=*/true);
9823 pop_nested_namespace (ns
);
9825 if (old_decl
== error_mark_node
)
9826 return error_mark_node
;
9828 if (old_decl
!= new_friend
)
9830 /* This new friend declaration matched an existing
9831 declaration. For example, given:
9833 template <class T> void f(T);
9834 template <class U> class C {
9835 template <class T> friend void f(T) {}
9838 the friend declaration actually provides the definition
9839 of `f', once C has been instantiated for some type. So,
9840 old_decl will be the out-of-class template declaration,
9841 while new_friend is the in-class definition.
9843 But, if `f' was called before this point, the
9844 instantiation of `f' will have DECL_TI_ARGS corresponding
9845 to `T' but not to `U', references to which might appear
9846 in the definition of `f'. Previously, the most general
9847 template for an instantiation of `f' was the out-of-class
9848 version; now it is the in-class version. Therefore, we
9849 run through all specialization of `f', adding to their
9850 DECL_TI_ARGS appropriately. In particular, they need a
9851 new set of outer arguments, corresponding to the
9852 arguments for this class instantiation.
9854 The same situation can arise with something like this:
9857 template <class T> class C {
9861 when `C<int>' is instantiated. Now, `f(int)' is defined
9864 if (!new_friend_is_defn
)
9865 /* On the other hand, if the in-class declaration does
9866 *not* provide a definition, then we don't want to alter
9867 existing definitions. We can just leave everything
9872 tree new_template
= TI_TEMPLATE (new_friend_template_info
);
9873 tree new_args
= TI_ARGS (new_friend_template_info
);
9875 /* Overwrite whatever template info was there before, if
9876 any, with the new template information pertaining to
9878 DECL_TEMPLATE_INFO (old_decl
) = new_friend_template_info
;
9880 if (TREE_CODE (old_decl
) != TEMPLATE_DECL
)
9882 /* We should have called reregister_specialization in
9884 gcc_assert (retrieve_specialization (new_template
,
9888 /* Instantiate it if the global has already been used. */
9889 if (DECL_ODR_USED (old_decl
))
9890 instantiate_decl (old_decl
, /*defer_ok=*/true,
9891 /*expl_inst_class_mem_p=*/false);
9897 /* Indicate that the old function template is a partial
9899 DECL_TEMPLATE_INFO (DECL_TEMPLATE_RESULT (old_decl
))
9900 = new_friend_result_template_info
;
9902 gcc_assert (new_template
9903 == most_general_template (new_template
));
9904 gcc_assert (new_template
!= old_decl
);
9906 /* Reassign any specializations already in the hash table
9907 to the new more general template, and add the
9908 additional template args. */
9909 for (t
= DECL_TEMPLATE_INSTANTIATIONS (old_decl
);
9913 tree spec
= TREE_VALUE (t
);
9916 elt
.tmpl
= old_decl
;
9917 elt
.args
= DECL_TI_ARGS (spec
);
9918 elt
.spec
= NULL_TREE
;
9920 decl_specializations
->remove_elt (&elt
);
9923 = add_outermost_template_args (new_args
,
9924 DECL_TI_ARGS (spec
));
9926 register_specialization
9927 (spec
, new_template
, DECL_TI_ARGS (spec
), true, 0);
9930 DECL_TEMPLATE_INSTANTIATIONS (old_decl
) = NULL_TREE
;
9934 /* The information from NEW_FRIEND has been merged into OLD_DECL
9935 by duplicate_decls. */
9936 new_friend
= old_decl
;
9941 tree context
= DECL_CONTEXT (new_friend
);
9945 template <class T> class C {
9946 template <class U> friend void C1<U>::f (); // case 1
9947 friend void C2<T>::f (); // case 2
9949 we only need to make sure CONTEXT is a complete type for
9950 case 2. To distinguish between the two cases, we note that
9951 CONTEXT of case 1 remains dependent type after tsubst while
9952 this isn't true for case 2. */
9953 ++processing_template_decl
;
9954 dependent_p
= dependent_type_p (context
);
9955 --processing_template_decl
;
9958 && !complete_type_or_else (context
, NULL_TREE
))
9959 return error_mark_node
;
9961 if (COMPLETE_TYPE_P (context
))
9963 tree fn
= new_friend
;
9964 /* do_friend adds the TEMPLATE_DECL for any member friend
9965 template even if it isn't a member template, i.e.
9966 template <class T> friend A<T>::f();
9967 Look through it in that case. */
9968 if (TREE_CODE (fn
) == TEMPLATE_DECL
9969 && !PRIMARY_TEMPLATE_P (fn
))
9970 fn
= DECL_TEMPLATE_RESULT (fn
);
9971 /* Check to see that the declaration is really present, and,
9972 possibly obtain an improved declaration. */
9973 fn
= check_classfn (context
, fn
, NULL_TREE
);
9983 /* FRIEND_TMPL is a friend TEMPLATE_DECL. ARGS is the vector of
9984 template arguments, as for tsubst.
9986 Returns an appropriate tsubst'd friend type or error_mark_node on
9990 tsubst_friend_class (tree friend_tmpl
, tree args
)
9996 if (DECL_TEMPLATE_TEMPLATE_PARM_P (friend_tmpl
))
9998 tree t
= tsubst (TREE_TYPE (friend_tmpl
), args
, tf_none
, NULL_TREE
);
9999 return TREE_TYPE (t
);
10002 context
= CP_DECL_CONTEXT (friend_tmpl
);
10004 if (context
!= global_namespace
)
10006 if (TREE_CODE (context
) == NAMESPACE_DECL
)
10007 push_nested_namespace (context
);
10009 push_nested_class (tsubst (context
, args
, tf_none
, NULL_TREE
));
10012 /* Look for a class template declaration. We look for hidden names
10013 because two friend declarations of the same template are the
10014 same. For example, in:
10017 template <typename> friend class F;
10019 template <typename> struct B {
10020 template <typename> friend class F;
10023 both F templates are the same. */
10024 tmpl
= lookup_name_real (DECL_NAME (friend_tmpl
), 0, 0,
10025 /*block_p=*/true, 0, LOOKUP_HIDDEN
);
10027 /* But, if we don't find one, it might be because we're in a
10028 situation like this:
10036 Here, in the scope of (say) S<int>, `S' is bound to a TYPE_DECL
10037 for `S<int>', not the TEMPLATE_DECL. */
10038 if (!tmpl
|| !DECL_CLASS_TEMPLATE_P (tmpl
))
10040 tmpl
= lookup_name_prefer_type (DECL_NAME (friend_tmpl
), 1);
10041 tmpl
= maybe_get_template_decl_from_type_decl (tmpl
);
10044 if (tmpl
&& DECL_CLASS_TEMPLATE_P (tmpl
))
10046 /* The friend template has already been declared. Just
10047 check to see that the declarations match, and install any new
10048 default parameters. We must tsubst the default parameters,
10049 of course. We only need the innermost template parameters
10050 because that is all that redeclare_class_template will look
10052 if (TMPL_PARMS_DEPTH (DECL_TEMPLATE_PARMS (friend_tmpl
))
10053 > TMPL_ARGS_DEPTH (args
))
10056 location_t saved_input_location
;
10057 parms
= tsubst_template_parms (DECL_TEMPLATE_PARMS (friend_tmpl
),
10058 args
, tf_warning_or_error
);
10060 saved_input_location
= input_location
;
10061 input_location
= DECL_SOURCE_LOCATION (friend_tmpl
);
10062 tree cons
= get_constraints (tmpl
);
10063 redeclare_class_template (TREE_TYPE (tmpl
), parms
, cons
);
10064 input_location
= saved_input_location
;
10068 friend_type
= TREE_TYPE (tmpl
);
10072 /* The friend template has not already been declared. In this
10073 case, the instantiation of the template class will cause the
10074 injection of this template into the global scope. */
10075 tmpl
= tsubst (friend_tmpl
, args
, tf_warning_or_error
, NULL_TREE
);
10076 if (tmpl
== error_mark_node
)
10077 return error_mark_node
;
10079 /* The new TMPL is not an instantiation of anything, so we
10080 forget its origins. We don't reset CLASSTYPE_TI_TEMPLATE for
10081 the new type because that is supposed to be the corresponding
10082 template decl, i.e., TMPL. */
10083 DECL_USE_TEMPLATE (tmpl
) = 0;
10084 DECL_TEMPLATE_INFO (tmpl
) = NULL_TREE
;
10085 CLASSTYPE_USE_TEMPLATE (TREE_TYPE (tmpl
)) = 0;
10086 CLASSTYPE_TI_ARGS (TREE_TYPE (tmpl
))
10087 = INNERMOST_TEMPLATE_ARGS (CLASSTYPE_TI_ARGS (TREE_TYPE (tmpl
)));
10089 /* Inject this template into the global scope. */
10090 friend_type
= TREE_TYPE (pushdecl_top_level (tmpl
, true));
10093 if (context
!= global_namespace
)
10095 if (TREE_CODE (context
) == NAMESPACE_DECL
)
10096 pop_nested_namespace (context
);
10098 pop_nested_class ();
10101 return friend_type
;
10104 /* Returns zero if TYPE cannot be completed later due to circularity.
10105 Otherwise returns one. */
10108 can_complete_type_without_circularity (tree type
)
10110 if (type
== NULL_TREE
|| type
== error_mark_node
)
10112 else if (COMPLETE_TYPE_P (type
))
10114 else if (TREE_CODE (type
) == ARRAY_TYPE
)
10115 return can_complete_type_without_circularity (TREE_TYPE (type
));
10116 else if (CLASS_TYPE_P (type
)
10117 && TYPE_BEING_DEFINED (TYPE_MAIN_VARIANT (type
)))
10123 static tree
tsubst_omp_clauses (tree
, enum c_omp_region_type
, tree
,
10124 tsubst_flags_t
, tree
);
10126 /* Instantiate a single dependent attribute T (a TREE_LIST), and return either
10127 T or a new TREE_LIST, possibly a chain in the case of a pack expansion. */
10130 tsubst_attribute (tree t
, tree
*decl_p
, tree args
,
10131 tsubst_flags_t complain
, tree in_decl
)
10133 gcc_assert (ATTR_IS_DEPENDENT (t
));
10135 tree val
= TREE_VALUE (t
);
10136 if (val
== NULL_TREE
)
10137 /* Nothing to do. */;
10138 else if ((flag_openmp
|| flag_openmp_simd
|| flag_cilkplus
)
10139 && is_attribute_p ("omp declare simd",
10140 get_attribute_name (t
)))
10142 tree clauses
= TREE_VALUE (val
);
10143 clauses
= tsubst_omp_clauses (clauses
, C_ORT_OMP_DECLARE_SIMD
, args
,
10144 complain
, in_decl
);
10145 c_omp_declare_simd_clauses_to_decls (*decl_p
, clauses
);
10146 clauses
= finish_omp_clauses (clauses
, C_ORT_OMP_DECLARE_SIMD
);
10147 tree parms
= DECL_ARGUMENTS (*decl_p
);
10149 = c_omp_declare_simd_clauses_to_numbers (parms
, clauses
);
10151 val
= build_tree_list (NULL_TREE
, clauses
);
10155 /* If the first attribute argument is an identifier, don't
10156 pass it through tsubst. Attributes like mode, format,
10157 cleanup and several target specific attributes expect it
10159 else if (attribute_takes_identifier_p (get_attribute_name (t
)))
10162 = tsubst_expr (TREE_CHAIN (val
), args
, complain
, in_decl
,
10163 /*integral_constant_expression_p=*/false);
10164 if (chain
!= TREE_CHAIN (val
))
10165 val
= tree_cons (NULL_TREE
, TREE_VALUE (val
), chain
);
10167 else if (PACK_EXPANSION_P (val
))
10169 /* An attribute pack expansion. */
10170 tree purp
= TREE_PURPOSE (t
);
10171 tree pack
= tsubst_pack_expansion (val
, args
, complain
, in_decl
);
10172 if (pack
== error_mark_node
)
10173 return error_mark_node
;
10174 int len
= TREE_VEC_LENGTH (pack
);
10175 tree list
= NULL_TREE
;
10177 for (int i
= 0; i
< len
; ++i
)
10179 tree elt
= TREE_VEC_ELT (pack
, i
);
10180 *q
= build_tree_list (purp
, elt
);
10181 q
= &TREE_CHAIN (*q
);
10186 val
= tsubst_expr (val
, args
, complain
, in_decl
,
10187 /*integral_constant_expression_p=*/false);
10189 if (val
!= TREE_VALUE (t
))
10190 return build_tree_list (TREE_PURPOSE (t
), val
);
10194 /* Instantiate any dependent attributes in ATTRIBUTES, returning either it
10195 unchanged or a new TREE_LIST chain. */
10198 tsubst_attributes (tree attributes
, tree args
,
10199 tsubst_flags_t complain
, tree in_decl
)
10201 tree last_dep
= NULL_TREE
;
10203 for (tree t
= attributes
; t
; t
= TREE_CHAIN (t
))
10204 if (ATTR_IS_DEPENDENT (t
))
10207 attributes
= copy_list (attributes
);
10212 for (tree
*p
= &attributes
; *p
; )
10215 if (ATTR_IS_DEPENDENT (t
))
10217 tree subst
= tsubst_attribute (t
, NULL
, args
, complain
, in_decl
);
10222 p
= &TREE_CHAIN (*p
);
10224 *p
= TREE_CHAIN (t
);
10228 p
= &TREE_CHAIN (*p
);
10234 /* Apply any attributes which had to be deferred until instantiation
10235 time. DECL_P, ATTRIBUTES and ATTR_FLAGS are as cplus_decl_attributes;
10236 ARGS, COMPLAIN, IN_DECL are as tsubst. */
10239 apply_late_template_attributes (tree
*decl_p
, tree attributes
, int attr_flags
,
10240 tree args
, tsubst_flags_t complain
, tree in_decl
)
10242 tree last_dep
= NULL_TREE
;
10246 if (attributes
== NULL_TREE
)
10249 if (DECL_P (*decl_p
))
10251 if (TREE_TYPE (*decl_p
) == error_mark_node
)
10253 p
= &DECL_ATTRIBUTES (*decl_p
);
10254 /* DECL_ATTRIBUTES comes from copy_node in tsubst_decl, and is identical
10255 to our attributes parameter. */
10256 gcc_assert (*p
== attributes
);
10260 p
= &TYPE_ATTRIBUTES (*decl_p
);
10261 /* TYPE_ATTRIBUTES was set up (with abi_tag and may_alias) in
10262 lookup_template_class_1, and should be preserved. */
10263 gcc_assert (*p
!= attributes
);
10265 p
= &TREE_CHAIN (*p
);
10268 for (t
= attributes
; t
; t
= TREE_CHAIN (t
))
10269 if (ATTR_IS_DEPENDENT (t
))
10272 attributes
= copy_list (attributes
);
10279 tree late_attrs
= NULL_TREE
;
10280 tree
*q
= &late_attrs
;
10285 if (ATTR_IS_DEPENDENT (t
))
10287 *p
= TREE_CHAIN (t
);
10288 TREE_CHAIN (t
) = NULL_TREE
;
10289 *q
= tsubst_attribute (t
, decl_p
, args
, complain
, in_decl
);
10291 q
= &TREE_CHAIN (*q
);
10295 p
= &TREE_CHAIN (t
);
10298 cplus_decl_attributes (decl_p
, late_attrs
, attr_flags
);
10302 /* Perform (or defer) access check for typedefs that were referenced
10303 from within the template TMPL code.
10304 This is a subroutine of instantiate_decl and instantiate_class_template.
10305 TMPL is the template to consider and TARGS is the list of arguments of
10309 perform_typedefs_access_check (tree tmpl
, tree targs
)
10311 location_t saved_location
;
10313 qualified_typedef_usage_t
*iter
;
10316 || (!CLASS_TYPE_P (tmpl
)
10317 && TREE_CODE (tmpl
) != FUNCTION_DECL
))
10320 saved_location
= input_location
;
10321 FOR_EACH_VEC_SAFE_ELT (get_types_needing_access_check (tmpl
), i
, iter
)
10323 tree type_decl
= iter
->typedef_decl
;
10324 tree type_scope
= iter
->context
;
10326 if (!type_decl
|| !type_scope
|| !CLASS_TYPE_P (type_scope
))
10329 if (uses_template_parms (type_decl
))
10330 type_decl
= tsubst (type_decl
, targs
, tf_error
, NULL_TREE
);
10331 if (uses_template_parms (type_scope
))
10332 type_scope
= tsubst (type_scope
, targs
, tf_error
, NULL_TREE
);
10334 /* Make access check error messages point to the location
10335 of the use of the typedef. */
10336 input_location
= iter
->locus
;
10337 perform_or_defer_access_check (TYPE_BINFO (type_scope
),
10338 type_decl
, type_decl
,
10339 tf_warning_or_error
);
10341 input_location
= saved_location
;
10345 instantiate_class_template_1 (tree type
)
10347 tree templ
, args
, pattern
, t
, member
;
10351 unsigned int saved_maximum_field_alignment
;
10354 if (type
== error_mark_node
)
10355 return error_mark_node
;
10357 if (COMPLETE_OR_OPEN_TYPE_P (type
)
10358 || uses_template_parms (type
))
10361 /* Figure out which template is being instantiated. */
10362 templ
= most_general_template (CLASSTYPE_TI_TEMPLATE (type
));
10363 gcc_assert (TREE_CODE (templ
) == TEMPLATE_DECL
);
10365 /* Determine what specialization of the original template to
10367 t
= most_specialized_partial_spec (type
, tf_warning_or_error
);
10368 if (t
== error_mark_node
)
10370 TYPE_BEING_DEFINED (type
) = 1;
10371 return error_mark_node
;
10375 /* This TYPE is actually an instantiation of a partial
10376 specialization. We replace the innermost set of ARGS with
10377 the arguments appropriate for substitution. For example,
10380 template <class T> struct S {};
10381 template <class T> struct S<T*> {};
10383 and supposing that we are instantiating S<int*>, ARGS will
10384 presently be {int*} -- but we need {int}. */
10385 pattern
= TREE_TYPE (t
);
10386 args
= TREE_PURPOSE (t
);
10390 pattern
= TREE_TYPE (templ
);
10391 args
= CLASSTYPE_TI_ARGS (type
);
10394 /* If the template we're instantiating is incomplete, then clearly
10395 there's nothing we can do. */
10396 if (!COMPLETE_TYPE_P (pattern
))
10399 /* If we've recursively instantiated too many templates, stop. */
10400 if (! push_tinst_level (type
))
10403 /* Now we're really doing the instantiation. Mark the type as in
10404 the process of being defined. */
10405 TYPE_BEING_DEFINED (type
) = 1;
10407 /* We may be in the middle of deferred access check. Disable
10409 push_deferring_access_checks (dk_no_deferred
);
10411 int saved_unevaluated_operand
= cp_unevaluated_operand
;
10412 int saved_inhibit_evaluation_warnings
= c_inhibit_evaluation_warnings
;
10414 fn_context
= decl_function_context (TYPE_MAIN_DECL (type
));
10415 /* Also avoid push_to_top_level for a lambda in an NSDMI. */
10416 if (!fn_context
&& LAMBDA_TYPE_P (type
) && TYPE_CLASS_SCOPE_P (type
))
10417 fn_context
= error_mark_node
;
10419 push_to_top_level ();
10422 cp_unevaluated_operand
= 0;
10423 c_inhibit_evaluation_warnings
= 0;
10425 /* Use #pragma pack from the template context. */
10426 saved_maximum_field_alignment
= maximum_field_alignment
;
10427 maximum_field_alignment
= TYPE_PRECISION (pattern
);
10429 SET_CLASSTYPE_INTERFACE_UNKNOWN (type
);
10431 /* Set the input location to the most specialized template definition.
10432 This is needed if tsubsting causes an error. */
10433 typedecl
= TYPE_MAIN_DECL (pattern
);
10434 input_location
= DECL_SOURCE_LOCATION (TYPE_NAME (type
)) =
10435 DECL_SOURCE_LOCATION (typedecl
);
10437 TYPE_PACKED (type
) = TYPE_PACKED (pattern
);
10438 SET_TYPE_ALIGN (type
, TYPE_ALIGN (pattern
));
10439 TYPE_USER_ALIGN (type
) = TYPE_USER_ALIGN (pattern
);
10440 CLASSTYPE_NON_AGGREGATE (type
) = CLASSTYPE_NON_AGGREGATE (pattern
);
10441 if (ANON_AGGR_TYPE_P (pattern
))
10442 SET_ANON_AGGR_TYPE_P (type
);
10443 if (CLASSTYPE_VISIBILITY_SPECIFIED (pattern
))
10445 CLASSTYPE_VISIBILITY_SPECIFIED (type
) = 1;
10446 CLASSTYPE_VISIBILITY (type
) = CLASSTYPE_VISIBILITY (pattern
);
10447 /* Adjust visibility for template arguments. */
10448 determine_visibility (TYPE_MAIN_DECL (type
));
10450 if (CLASS_TYPE_P (type
))
10451 CLASSTYPE_FINAL (type
) = CLASSTYPE_FINAL (pattern
);
10453 pbinfo
= TYPE_BINFO (pattern
);
10455 /* We should never instantiate a nested class before its enclosing
10456 class; we need to look up the nested class by name before we can
10457 instantiate it, and that lookup should instantiate the enclosing
10459 gcc_assert (!DECL_CLASS_SCOPE_P (TYPE_MAIN_DECL (pattern
))
10460 || COMPLETE_OR_OPEN_TYPE_P (TYPE_CONTEXT (type
)));
10462 base_list
= NULL_TREE
;
10463 if (BINFO_N_BASE_BINFOS (pbinfo
))
10469 /* We must enter the scope containing the type, as that is where
10470 the accessibility of types named in dependent bases are
10472 pushed_scope
= push_scope (CP_TYPE_CONTEXT (type
));
10474 /* Substitute into each of the bases to determine the actual
10476 for (i
= 0; BINFO_BASE_ITERATE (pbinfo
, i
, pbase_binfo
); i
++)
10479 tree access
= BINFO_BASE_ACCESS (pbinfo
, i
);
10480 tree expanded_bases
= NULL_TREE
;
10483 if (PACK_EXPANSION_P (BINFO_TYPE (pbase_binfo
)))
10486 tsubst_pack_expansion (BINFO_TYPE (pbase_binfo
),
10487 args
, tf_error
, NULL_TREE
);
10488 if (expanded_bases
== error_mark_node
)
10491 len
= TREE_VEC_LENGTH (expanded_bases
);
10494 for (idx
= 0; idx
< len
; idx
++)
10496 if (expanded_bases
)
10497 /* Extract the already-expanded base class. */
10498 base
= TREE_VEC_ELT (expanded_bases
, idx
);
10500 /* Substitute to figure out the base class. */
10501 base
= tsubst (BINFO_TYPE (pbase_binfo
), args
, tf_error
,
10504 if (base
== error_mark_node
)
10507 base_list
= tree_cons (access
, base
, base_list
);
10508 if (BINFO_VIRTUAL_P (pbase_binfo
))
10509 TREE_TYPE (base_list
) = integer_type_node
;
10513 /* The list is now in reverse order; correct that. */
10514 base_list
= nreverse (base_list
);
10517 pop_scope (pushed_scope
);
10519 /* Now call xref_basetypes to set up all the base-class
10521 xref_basetypes (type
, base_list
);
10523 apply_late_template_attributes (&type
, TYPE_ATTRIBUTES (pattern
),
10524 (int) ATTR_FLAG_TYPE_IN_PLACE
,
10525 args
, tf_error
, NULL_TREE
);
10526 fixup_attribute_variants (type
);
10528 /* Now that our base classes are set up, enter the scope of the
10529 class, so that name lookups into base classes, etc. will work
10530 correctly. This is precisely analogous to what we do in
10531 begin_class_definition when defining an ordinary non-template
10532 class, except we also need to push the enclosing classes. */
10533 push_nested_class (type
);
10535 /* Now members are processed in the order of declaration. */
10536 for (member
= CLASSTYPE_DECL_LIST (pattern
);
10537 member
; member
= TREE_CHAIN (member
))
10539 tree t
= TREE_VALUE (member
);
10541 if (TREE_PURPOSE (member
))
10545 /* Build new CLASSTYPE_NESTED_UTDS. */
10548 bool class_template_p
;
10550 class_template_p
= (TREE_CODE (t
) != ENUMERAL_TYPE
10551 && TYPE_LANG_SPECIFIC (t
)
10552 && CLASSTYPE_IS_TEMPLATE (t
));
10553 /* If the member is a class template, then -- even after
10554 substitution -- there may be dependent types in the
10555 template argument list for the class. We increment
10556 PROCESSING_TEMPLATE_DECL so that dependent_type_p, as
10557 that function will assume that no types are dependent
10558 when outside of a template. */
10559 if (class_template_p
)
10560 ++processing_template_decl
;
10561 newtag
= tsubst (t
, args
, tf_error
, NULL_TREE
);
10562 if (class_template_p
)
10563 --processing_template_decl
;
10564 if (newtag
== error_mark_node
)
10567 if (TREE_CODE (newtag
) != ENUMERAL_TYPE
)
10569 tree name
= TYPE_IDENTIFIER (t
);
10571 if (class_template_p
)
10572 /* Unfortunately, lookup_template_class sets
10573 CLASSTYPE_IMPLICIT_INSTANTIATION for a partial
10574 instantiation (i.e., for the type of a member
10575 template class nested within a template class.)
10576 This behavior is required for
10577 maybe_process_partial_specialization to work
10578 correctly, but is not accurate in this case;
10579 the TAG is not an instantiation of anything.
10580 (The corresponding TEMPLATE_DECL is an
10581 instantiation, but the TYPE is not.) */
10582 CLASSTYPE_USE_TEMPLATE (newtag
) = 0;
10584 /* Now, we call pushtag to put this NEWTAG into the scope of
10585 TYPE. We first set up the IDENTIFIER_TYPE_VALUE to avoid
10586 pushtag calling push_template_decl. We don't have to do
10587 this for enums because it will already have been done in
10590 SET_IDENTIFIER_TYPE_VALUE (name
, newtag
);
10591 pushtag (name
, newtag
, /*tag_scope=*/ts_current
);
10594 else if (DECL_DECLARES_FUNCTION_P (t
))
10598 if (TREE_CODE (t
) == TEMPLATE_DECL
)
10599 ++processing_template_decl
;
10600 r
= tsubst (t
, args
, tf_error
, NULL_TREE
);
10601 if (TREE_CODE (t
) == TEMPLATE_DECL
)
10602 --processing_template_decl
;
10603 set_current_access_from_decl (r
);
10604 finish_member_declaration (r
);
10605 /* Instantiate members marked with attribute used. */
10606 if (r
!= error_mark_node
&& DECL_PRESERVE_P (r
))
10608 if (TREE_CODE (r
) == FUNCTION_DECL
10609 && DECL_OMP_DECLARE_REDUCTION_P (r
))
10610 cp_check_omp_declare_reduction (r
);
10612 else if (DECL_CLASS_TEMPLATE_P (t
)
10613 && LAMBDA_TYPE_P (TREE_TYPE (t
)))
10614 /* A closure type for a lambda in a default argument for a
10615 member template. Ignore it; it will be instantiated with
10616 the default argument. */;
10619 /* Build new TYPE_FIELDS. */
10620 if (TREE_CODE (t
) == STATIC_ASSERT
)
10624 ++c_inhibit_evaluation_warnings
;
10626 tsubst_expr (STATIC_ASSERT_CONDITION (t
), args
,
10627 tf_warning_or_error
, NULL_TREE
,
10628 /*integral_constant_expression_p=*/true);
10629 --c_inhibit_evaluation_warnings
;
10631 finish_static_assert (condition
,
10632 STATIC_ASSERT_MESSAGE (t
),
10633 STATIC_ASSERT_SOURCE_LOCATION (t
),
10634 /*member_p=*/true);
10636 else if (TREE_CODE (t
) != CONST_DECL
)
10639 tree vec
= NULL_TREE
;
10642 /* The file and line for this declaration, to
10643 assist in error message reporting. Since we
10644 called push_tinst_level above, we don't need to
10646 input_location
= DECL_SOURCE_LOCATION (t
);
10648 if (TREE_CODE (t
) == TEMPLATE_DECL
)
10649 ++processing_template_decl
;
10650 r
= tsubst (t
, args
, tf_warning_or_error
, NULL_TREE
);
10651 if (TREE_CODE (t
) == TEMPLATE_DECL
)
10652 --processing_template_decl
;
10654 if (TREE_CODE (r
) == TREE_VEC
)
10656 /* A capture pack became multiple fields. */
10658 len
= TREE_VEC_LENGTH (vec
);
10661 for (int i
= 0; i
< len
; ++i
)
10664 r
= TREE_VEC_ELT (vec
, i
);
10669 [t]he initialization (and any associated
10670 side-effects) of a static data member does
10671 not occur unless the static data member is
10672 itself used in a way that requires the
10673 definition of the static data member to
10676 Therefore, we do not substitute into the
10677 initialized for the static data member here. */
10678 finish_static_data_member_decl
10680 /*init=*/NULL_TREE
,
10681 /*init_const_expr_p=*/false,
10682 /*asmspec_tree=*/NULL_TREE
,
10684 /* Instantiate members marked with attribute used. */
10685 if (r
!= error_mark_node
&& DECL_PRESERVE_P (r
))
10688 else if (TREE_CODE (r
) == FIELD_DECL
)
10690 /* Determine whether R has a valid type and can be
10691 completed later. If R is invalid, then its type
10692 is replaced by error_mark_node. */
10693 tree rtype
= TREE_TYPE (r
);
10694 if (can_complete_type_without_circularity (rtype
))
10695 complete_type (rtype
);
10697 if (!complete_or_array_type_p (rtype
))
10699 /* If R's type couldn't be completed and
10700 it isn't a flexible array member (whose
10701 type is incomplete by definition) give
10703 cxx_incomplete_type_error (r
, rtype
);
10704 TREE_TYPE (r
) = error_mark_node
;
10708 /* If it is a TYPE_DECL for a class-scoped ENUMERAL_TYPE,
10709 such a thing will already have been added to the field
10710 list by tsubst_enum in finish_member_declaration in the
10711 CLASSTYPE_NESTED_UTDS case above. */
10712 if (!(TREE_CODE (r
) == TYPE_DECL
10713 && TREE_CODE (TREE_TYPE (r
)) == ENUMERAL_TYPE
10714 && DECL_ARTIFICIAL (r
)))
10716 set_current_access_from_decl (r
);
10717 finish_member_declaration (r
);
10725 if (TYPE_P (t
) || DECL_CLASS_TEMPLATE_P (t
)
10726 || DECL_TEMPLATE_TEMPLATE_PARM_P (t
))
10728 /* Build new CLASSTYPE_FRIEND_CLASSES. */
10730 tree friend_type
= t
;
10731 bool adjust_processing_template_decl
= false;
10733 if (TREE_CODE (friend_type
) == TEMPLATE_DECL
)
10735 /* template <class T> friend class C; */
10736 friend_type
= tsubst_friend_class (friend_type
, args
);
10737 adjust_processing_template_decl
= true;
10739 else if (TREE_CODE (friend_type
) == UNBOUND_CLASS_TEMPLATE
)
10741 /* template <class T> friend class C::D; */
10742 friend_type
= tsubst (friend_type
, args
,
10743 tf_warning_or_error
, NULL_TREE
);
10744 if (TREE_CODE (friend_type
) == TEMPLATE_DECL
)
10745 friend_type
= TREE_TYPE (friend_type
);
10746 adjust_processing_template_decl
= true;
10748 else if (TREE_CODE (friend_type
) == TYPENAME_TYPE
10749 || TREE_CODE (friend_type
) == TEMPLATE_TYPE_PARM
)
10751 /* This could be either
10755 when dependent_type_p is false or
10757 template <class U> friend class T::C;
10760 /* Bump processing_template_decl in case this is something like
10761 template <class T> friend struct A<T>::B. */
10762 ++processing_template_decl
;
10763 friend_type
= tsubst (friend_type
, args
,
10764 tf_warning_or_error
, NULL_TREE
);
10765 if (dependent_type_p (friend_type
))
10766 adjust_processing_template_decl
= true;
10767 --processing_template_decl
;
10769 else if (TREE_CODE (friend_type
) != BOUND_TEMPLATE_TEMPLATE_PARM
10770 && !CLASSTYPE_USE_TEMPLATE (friend_type
)
10771 && TYPE_HIDDEN_P (friend_type
))
10775 where C hasn't been declared yet. Let's lookup name
10776 from namespace scope directly, bypassing any name that
10777 come from dependent base class. */
10778 tree ns
= decl_namespace_context (TYPE_MAIN_DECL (friend_type
));
10780 /* The call to xref_tag_from_type does injection for friend
10782 push_nested_namespace (ns
);
10784 xref_tag_from_type (friend_type
, NULL_TREE
,
10785 /*tag_scope=*/ts_current
);
10786 pop_nested_namespace (ns
);
10788 else if (uses_template_parms (friend_type
))
10789 /* friend class C<T>; */
10790 friend_type
= tsubst (friend_type
, args
,
10791 tf_warning_or_error
, NULL_TREE
);
10796 where C is already declared or
10798 friend class C<int>;
10800 We don't have to do anything in these cases. */
10802 if (adjust_processing_template_decl
)
10803 /* Trick make_friend_class into realizing that the friend
10804 we're adding is a template, not an ordinary class. It's
10805 important that we use make_friend_class since it will
10806 perform some error-checking and output cross-reference
10808 ++processing_template_decl
;
10810 if (friend_type
!= error_mark_node
)
10811 make_friend_class (type
, friend_type
, /*complain=*/false);
10813 if (adjust_processing_template_decl
)
10814 --processing_template_decl
;
10818 /* Build new DECL_FRIENDLIST. */
10821 /* The file and line for this declaration, to
10822 assist in error message reporting. Since we
10823 called push_tinst_level above, we don't need to
10825 input_location
= DECL_SOURCE_LOCATION (t
);
10827 if (TREE_CODE (t
) == TEMPLATE_DECL
)
10829 ++processing_template_decl
;
10830 push_deferring_access_checks (dk_no_check
);
10833 r
= tsubst_friend_function (t
, args
);
10834 add_friend (type
, r
, /*complain=*/false);
10835 if (TREE_CODE (t
) == TEMPLATE_DECL
)
10837 pop_deferring_access_checks ();
10838 --processing_template_decl
;
10846 /* Restore these before substituting into the lambda capture
10848 cp_unevaluated_operand
= saved_unevaluated_operand
;
10849 c_inhibit_evaluation_warnings
= saved_inhibit_evaluation_warnings
;
10852 if (tree expr
= CLASSTYPE_LAMBDA_EXPR (type
))
10854 tree decl
= lambda_function (type
);
10857 if (cxx_dialect
>= cxx17
)
10858 CLASSTYPE_LITERAL_P (type
) = true;
10860 if (!DECL_TEMPLATE_INFO (decl
)
10861 || DECL_TEMPLATE_RESULT (DECL_TI_TEMPLATE (decl
)) != decl
)
10863 /* Set function_depth to avoid garbage collection. */
10865 instantiate_decl (decl
, /*defer_ok=*/false, false);
10869 /* We need to instantiate the capture list from the template
10870 after we've instantiated the closure members, but before we
10871 consider adding the conversion op. Also keep any captures
10872 that may have been added during instantiation of the op(). */
10873 tree tmpl_expr
= CLASSTYPE_LAMBDA_EXPR (pattern
);
10875 = tsubst_copy_and_build (LAMBDA_EXPR_CAPTURE_LIST (tmpl_expr
),
10876 args
, tf_warning_or_error
, NULL_TREE
,
10879 LAMBDA_EXPR_CAPTURE_LIST (expr
)
10880 = chainon (tmpl_cap
, nreverse (LAMBDA_EXPR_CAPTURE_LIST (expr
)));
10882 maybe_add_lambda_conv_op (type
);
10885 gcc_assert (errorcount
);
10888 /* Set the file and line number information to whatever is given for
10889 the class itself. This puts error messages involving generated
10890 implicit functions at a predictable point, and the same point
10891 that would be used for non-template classes. */
10892 input_location
= DECL_SOURCE_LOCATION (typedecl
);
10894 unreverse_member_declarations (type
);
10895 finish_struct_1 (type
);
10896 TYPE_BEING_DEFINED (type
) = 0;
10898 /* We don't instantiate default arguments for member functions. 14.7.1:
10900 The implicit instantiation of a class template specialization causes
10901 the implicit instantiation of the declarations, but not of the
10902 definitions or default arguments, of the class member functions,
10903 member classes, static data members and member templates.... */
10905 /* Some typedefs referenced from within the template code need to be access
10906 checked at template instantiation time, i.e now. These types were
10907 added to the template at parsing time. Let's get those and perform
10908 the access checks then. */
10909 perform_typedefs_access_check (pattern
, args
);
10910 perform_deferred_access_checks (tf_warning_or_error
);
10911 pop_nested_class ();
10912 maximum_field_alignment
= saved_maximum_field_alignment
;
10914 pop_from_top_level ();
10915 pop_deferring_access_checks ();
10916 pop_tinst_level ();
10918 /* The vtable for a template class can be emitted in any translation
10919 unit in which the class is instantiated. When there is no key
10920 method, however, finish_struct_1 will already have added TYPE to
10921 the keyed_classes. */
10922 if (TYPE_CONTAINS_VPTR_P (type
) && CLASSTYPE_KEY_METHOD (type
))
10923 vec_safe_push (keyed_classes
, type
);
10928 /* Wrapper for instantiate_class_template_1. */
10931 instantiate_class_template (tree type
)
10934 timevar_push (TV_TEMPLATE_INST
);
10935 ret
= instantiate_class_template_1 (type
);
10936 timevar_pop (TV_TEMPLATE_INST
);
10941 tsubst_template_arg (tree t
, tree args
, tsubst_flags_t complain
, tree in_decl
)
10947 else if (TYPE_P (t
))
10948 r
= tsubst (t
, args
, complain
, in_decl
);
10951 if (!(complain
& tf_warning
))
10952 ++c_inhibit_evaluation_warnings
;
10953 r
= tsubst_expr (t
, args
, complain
, in_decl
,
10954 /*integral_constant_expression_p=*/true);
10955 if (!(complain
& tf_warning
))
10956 --c_inhibit_evaluation_warnings
;
10961 /* Given a function parameter pack TMPL_PARM and some function parameters
10962 instantiated from it at *SPEC_P, return a NONTYPE_ARGUMENT_PACK of them
10963 and set *SPEC_P to point at the next point in the list. */
10966 extract_fnparm_pack (tree tmpl_parm
, tree
*spec_p
)
10968 /* Collect all of the extra "packed" parameters into an
10971 tree argpack
= make_node (NONTYPE_ARGUMENT_PACK
);
10972 tree spec_parm
= *spec_p
;
10975 for (len
= 0; spec_parm
; ++len
, spec_parm
= TREE_CHAIN (spec_parm
))
10977 && !function_parameter_expanded_from_pack_p (spec_parm
, tmpl_parm
))
10980 /* Fill in PARMVEC and PARMTYPEVEC with all of the parameters. */
10981 parmvec
= make_tree_vec (len
);
10982 spec_parm
= *spec_p
;
10983 for (i
= 0; i
< len
; i
++, spec_parm
= DECL_CHAIN (spec_parm
))
10984 TREE_VEC_ELT (parmvec
, i
) = spec_parm
;
10986 /* Build the argument packs. */
10987 SET_ARGUMENT_PACK_ARGS (argpack
, parmvec
);
10988 *spec_p
= spec_parm
;
10993 /* Give a chain SPEC_PARM of PARM_DECLs, pack them into a
10994 NONTYPE_ARGUMENT_PACK. */
10997 make_fnparm_pack (tree spec_parm
)
10999 return extract_fnparm_pack (NULL_TREE
, &spec_parm
);
11002 /* Return 1 if the Ith element of the argument pack ARG_PACK is a
11003 pack expansion with no extra args, 2 if it has extra args, or 0
11004 if it is not a pack expansion. */
11007 argument_pack_element_is_expansion_p (tree arg_pack
, int i
)
11009 tree vec
= ARGUMENT_PACK_ARGS (arg_pack
);
11010 if (i
>= TREE_VEC_LENGTH (vec
))
11012 tree elt
= TREE_VEC_ELT (vec
, i
);
11014 /* A decl pack is itself an expansion. */
11015 elt
= TREE_TYPE (elt
);
11016 if (!PACK_EXPANSION_P (elt
))
11018 if (PACK_EXPANSION_EXTRA_ARGS (elt
))
11024 /* Creates and return an ARGUMENT_PACK_SELECT tree node. */
11027 make_argument_pack_select (tree arg_pack
, unsigned index
)
11029 tree aps
= make_node (ARGUMENT_PACK_SELECT
);
11031 ARGUMENT_PACK_SELECT_FROM_PACK (aps
) = arg_pack
;
11032 ARGUMENT_PACK_SELECT_INDEX (aps
) = index
;
11037 /* This is a subroutine of tsubst_pack_expansion.
11039 It returns TRUE if we need to use the PACK_EXPANSION_EXTRA_ARGS
11040 mechanism to store the (non complete list of) arguments of the
11041 substitution and return a non substituted pack expansion, in order
11042 to wait for when we have enough arguments to really perform the
11046 use_pack_expansion_extra_args_p (tree parm_packs
,
11048 bool has_empty_arg
)
11050 /* If one pack has an expansion and another pack has a normal
11051 argument or if one pack has an empty argument and an another
11052 one hasn't then tsubst_pack_expansion cannot perform the
11053 substitution and need to fall back on the
11054 PACK_EXPANSION_EXTRA mechanism. */
11055 if (parm_packs
== NULL_TREE
)
11057 else if (has_empty_arg
)
11060 bool has_expansion_arg
= false;
11061 for (int i
= 0 ; i
< arg_pack_len
; ++i
)
11063 bool has_non_expansion_arg
= false;
11064 for (tree parm_pack
= parm_packs
;
11066 parm_pack
= TREE_CHAIN (parm_pack
))
11068 tree arg
= TREE_VALUE (parm_pack
);
11070 int exp
= argument_pack_element_is_expansion_p (arg
, i
);
11072 /* We can't substitute a pack expansion with extra args into
11076 has_expansion_arg
= true;
11078 has_non_expansion_arg
= true;
11081 if (has_expansion_arg
&& has_non_expansion_arg
)
11087 /* [temp.variadic]/6 says that:
11089 The instantiation of a pack expansion [...]
11090 produces a list E1,E2, ..., En, where N is the number of elements
11091 in the pack expansion parameters.
11093 This subroutine of tsubst_pack_expansion produces one of these Ei.
11095 PATTERN is the pattern of the pack expansion. PARM_PACKS is a
11096 TREE_LIST in which each TREE_PURPOSE is a parameter pack of
11097 PATTERN, and each TREE_VALUE is its corresponding argument pack.
11098 INDEX is the index 'i' of the element Ei to produce. ARGS,
11099 COMPLAIN, and IN_DECL are the same parameters as for the
11100 tsubst_pack_expansion function.
11102 The function returns the resulting Ei upon successful completion,
11103 or error_mark_node.
11105 Note that this function possibly modifies the ARGS parameter, so
11106 it's the responsibility of the caller to restore it. */
11109 gen_elem_of_pack_expansion_instantiation (tree pattern
,
11112 tree args
/* This parm gets
11114 tsubst_flags_t complain
,
11118 bool ith_elem_is_expansion
= false;
11120 /* For each parameter pack, change the substitution of the parameter
11121 pack to the ith argument in its argument pack, then expand the
11123 for (tree pack
= parm_packs
; pack
; pack
= TREE_CHAIN (pack
))
11125 tree parm
= TREE_PURPOSE (pack
);
11126 tree arg_pack
= TREE_VALUE (pack
);
11127 tree aps
; /* instance of ARGUMENT_PACK_SELECT. */
11129 ith_elem_is_expansion
|=
11130 argument_pack_element_is_expansion_p (arg_pack
, index
);
11132 /* Select the Ith argument from the pack. */
11133 if (TREE_CODE (parm
) == PARM_DECL
11134 || TREE_CODE (parm
) == FIELD_DECL
)
11138 aps
= make_argument_pack_select (arg_pack
, index
);
11139 if (!mark_used (parm
, complain
) && !(complain
& tf_error
))
11140 return error_mark_node
;
11141 register_local_specialization (aps
, parm
);
11144 aps
= retrieve_local_specialization (parm
);
11149 template_parm_level_and_index (parm
, &level
, &idx
);
11153 aps
= make_argument_pack_select (arg_pack
, index
);
11154 /* Update the corresponding argument. */
11155 TMPL_ARG (args
, level
, idx
) = aps
;
11158 /* Re-use the ARGUMENT_PACK_SELECT. */
11159 aps
= TMPL_ARG (args
, level
, idx
);
11161 ARGUMENT_PACK_SELECT_INDEX (aps
) = index
;
11164 /* Substitute into the PATTERN with the (possibly altered)
11166 if (pattern
== in_decl
)
11167 /* Expanding a fixed parameter pack from
11168 coerce_template_parameter_pack. */
11169 t
= tsubst_decl (pattern
, args
, complain
);
11170 else if (pattern
== error_mark_node
)
11171 t
= error_mark_node
;
11172 else if (constraint_p (pattern
))
11174 if (processing_template_decl
)
11175 t
= tsubst_constraint (pattern
, args
, complain
, in_decl
);
11177 t
= (constraints_satisfied_p (pattern
, args
)
11178 ? boolean_true_node
: boolean_false_node
);
11180 else if (!TYPE_P (pattern
))
11181 t
= tsubst_expr (pattern
, args
, complain
, in_decl
,
11182 /*integral_constant_expression_p=*/false);
11184 t
= tsubst (pattern
, args
, complain
, in_decl
);
11186 /* If the Ith argument pack element is a pack expansion, then
11187 the Ith element resulting from the substituting is going to
11188 be a pack expansion as well. */
11189 if (ith_elem_is_expansion
)
11190 t
= make_pack_expansion (t
, complain
);
11195 /* When the unexpanded parameter pack in a fold expression expands to an empty
11196 sequence, the value of the expression is as follows; the program is
11197 ill-formed if the operator is not listed in this table.
11204 expand_empty_fold (tree t
, tsubst_flags_t complain
)
11206 tree_code code
= (tree_code
)TREE_INT_CST_LOW (TREE_OPERAND (t
, 0));
11207 if (!FOLD_EXPR_MODIFY_P (t
))
11210 case TRUTH_ANDIF_EXPR
:
11211 return boolean_true_node
;
11212 case TRUTH_ORIF_EXPR
:
11213 return boolean_false_node
;
11214 case COMPOUND_EXPR
:
11220 if (complain
& tf_error
)
11221 error_at (location_of (t
),
11222 "fold of empty expansion over %O", code
);
11223 return error_mark_node
;
11226 /* Given a fold-expression T and a current LEFT and RIGHT operand,
11227 form an expression that combines the two terms using the
11231 fold_expression (tree t
, tree left
, tree right
, tsubst_flags_t complain
)
11233 tree op
= FOLD_EXPR_OP (t
);
11234 tree_code code
= (tree_code
)TREE_INT_CST_LOW (op
);
11236 // Handle compound assignment operators.
11237 if (FOLD_EXPR_MODIFY_P (t
))
11238 return build_x_modify_expr (input_location
, left
, code
, right
, complain
);
11242 case COMPOUND_EXPR
:
11243 return build_x_compound_expr (input_location
, left
, right
, complain
);
11245 return build_m_component_ref (left
, right
, complain
);
11247 return build_x_binary_op (input_location
, code
,
11248 left
, TREE_CODE (left
),
11249 right
, TREE_CODE (right
),
11255 /* Substitute ARGS into the pack of a fold expression T. */
11258 tsubst_fold_expr_pack (tree t
, tree args
, tsubst_flags_t complain
, tree in_decl
)
11260 return tsubst_pack_expansion (FOLD_EXPR_PACK (t
), args
, complain
, in_decl
);
11263 /* Substitute ARGS into the pack of a fold expression T. */
11266 tsubst_fold_expr_init (tree t
, tree args
, tsubst_flags_t complain
, tree in_decl
)
11268 return tsubst_expr (FOLD_EXPR_INIT (t
), args
, complain
, in_decl
, false);
11271 /* Expand a PACK of arguments into a grouped as left fold.
11272 Given a pack containing elements A0, A1, ..., An and an
11273 operator @, this builds the expression:
11275 ((A0 @ A1) @ A2) ... @ An
11277 Note that PACK must not be empty.
11279 The operator is defined by the original fold expression T. */
11282 expand_left_fold (tree t
, tree pack
, tsubst_flags_t complain
)
11284 tree left
= TREE_VEC_ELT (pack
, 0);
11285 for (int i
= 1; i
< TREE_VEC_LENGTH (pack
); ++i
)
11287 tree right
= TREE_VEC_ELT (pack
, i
);
11288 left
= fold_expression (t
, left
, right
, complain
);
11293 /* Substitute into a unary left fold expression. */
11296 tsubst_unary_left_fold (tree t
, tree args
, tsubst_flags_t complain
,
11299 tree pack
= tsubst_fold_expr_pack (t
, args
, complain
, in_decl
);
11300 if (pack
== error_mark_node
)
11301 return error_mark_node
;
11302 if (PACK_EXPANSION_P (pack
))
11304 tree r
= copy_node (t
);
11305 FOLD_EXPR_PACK (r
) = pack
;
11308 if (TREE_VEC_LENGTH (pack
) == 0)
11309 return expand_empty_fold (t
, complain
);
11311 return expand_left_fold (t
, pack
, complain
);
11314 /* Substitute into a binary left fold expression.
11316 Do ths by building a single (non-empty) vector of argumnts and
11317 building the expression from those elements. */
11320 tsubst_binary_left_fold (tree t
, tree args
, tsubst_flags_t complain
,
11323 tree pack
= tsubst_fold_expr_pack (t
, args
, complain
, in_decl
);
11324 if (pack
== error_mark_node
)
11325 return error_mark_node
;
11326 tree init
= tsubst_fold_expr_init (t
, args
, complain
, in_decl
);
11327 if (init
== error_mark_node
)
11328 return error_mark_node
;
11330 if (PACK_EXPANSION_P (pack
))
11332 tree r
= copy_node (t
);
11333 FOLD_EXPR_PACK (r
) = pack
;
11334 FOLD_EXPR_INIT (r
) = init
;
11338 tree vec
= make_tree_vec (TREE_VEC_LENGTH (pack
) + 1);
11339 TREE_VEC_ELT (vec
, 0) = init
;
11340 for (int i
= 0; i
< TREE_VEC_LENGTH (pack
); ++i
)
11341 TREE_VEC_ELT (vec
, i
+ 1) = TREE_VEC_ELT (pack
, i
);
11343 return expand_left_fold (t
, vec
, complain
);
11346 /* Expand a PACK of arguments into a grouped as right fold.
11347 Given a pack containing elementns A0, A1, ..., and an
11348 operator @, this builds the expression:
11350 A0@ ... (An-2 @ (An-1 @ An))
11352 Note that PACK must not be empty.
11354 The operator is defined by the original fold expression T. */
11357 expand_right_fold (tree t
, tree pack
, tsubst_flags_t complain
)
11359 // Build the expression.
11360 int n
= TREE_VEC_LENGTH (pack
);
11361 tree right
= TREE_VEC_ELT (pack
, n
- 1);
11362 for (--n
; n
!= 0; --n
)
11364 tree left
= TREE_VEC_ELT (pack
, n
- 1);
11365 right
= fold_expression (t
, left
, right
, complain
);
11370 /* Substitute into a unary right fold expression. */
11373 tsubst_unary_right_fold (tree t
, tree args
, tsubst_flags_t complain
,
11376 tree pack
= tsubst_fold_expr_pack (t
, args
, complain
, in_decl
);
11377 if (pack
== error_mark_node
)
11378 return error_mark_node
;
11379 if (PACK_EXPANSION_P (pack
))
11381 tree r
= copy_node (t
);
11382 FOLD_EXPR_PACK (r
) = pack
;
11385 if (TREE_VEC_LENGTH (pack
) == 0)
11386 return expand_empty_fold (t
, complain
);
11388 return expand_right_fold (t
, pack
, complain
);
11391 /* Substitute into a binary right fold expression.
11393 Do ths by building a single (non-empty) vector of arguments and
11394 building the expression from those elements. */
11397 tsubst_binary_right_fold (tree t
, tree args
, tsubst_flags_t complain
,
11400 tree pack
= tsubst_fold_expr_pack (t
, args
, complain
, in_decl
);
11401 if (pack
== error_mark_node
)
11402 return error_mark_node
;
11403 tree init
= tsubst_fold_expr_init (t
, args
, complain
, in_decl
);
11404 if (init
== error_mark_node
)
11405 return error_mark_node
;
11407 if (PACK_EXPANSION_P (pack
))
11409 tree r
= copy_node (t
);
11410 FOLD_EXPR_PACK (r
) = pack
;
11411 FOLD_EXPR_INIT (r
) = init
;
11415 int n
= TREE_VEC_LENGTH (pack
);
11416 tree vec
= make_tree_vec (n
+ 1);
11417 for (int i
= 0; i
< n
; ++i
)
11418 TREE_VEC_ELT (vec
, i
) = TREE_VEC_ELT (pack
, i
);
11419 TREE_VEC_ELT (vec
, n
) = init
;
11421 return expand_right_fold (t
, vec
, complain
);
11425 /* Substitute ARGS into T, which is an pack expansion
11426 (i.e. TYPE_PACK_EXPANSION or EXPR_PACK_EXPANSION). Returns a
11427 TREE_VEC with the substituted arguments, a PACK_EXPANSION_* node
11428 (if only a partial substitution could be performed) or
11429 ERROR_MARK_NODE if there was an error. */
11431 tsubst_pack_expansion (tree t
, tree args
, tsubst_flags_t complain
,
11435 tree pack
, packs
= NULL_TREE
;
11436 bool unsubstituted_packs
= false;
11439 hash_map
<tree
, tree
> *saved_local_specializations
= NULL
;
11440 bool need_local_specializations
= false;
11443 gcc_assert (PACK_EXPANSION_P (t
));
11444 pattern
= PACK_EXPANSION_PATTERN (t
);
11446 /* Add in any args remembered from an earlier partial instantiation. */
11447 args
= add_to_template_args (PACK_EXPANSION_EXTRA_ARGS (t
), args
);
11449 levels
= TMPL_ARGS_DEPTH (args
);
11451 /* Determine the argument packs that will instantiate the parameter
11452 packs used in the expansion expression. While we're at it,
11453 compute the number of arguments to be expanded and make sure it
11455 for (pack
= PACK_EXPANSION_PARAMETER_PACKS (t
); pack
;
11456 pack
= TREE_CHAIN (pack
))
11458 tree parm_pack
= TREE_VALUE (pack
);
11459 tree arg_pack
= NULL_TREE
;
11460 tree orig_arg
= NULL_TREE
;
11463 if (TREE_CODE (parm_pack
) == BASES
)
11465 gcc_assert (parm_pack
== pattern
);
11466 if (BASES_DIRECT (parm_pack
))
11467 return calculate_direct_bases (tsubst_expr (BASES_TYPE (parm_pack
),
11468 args
, complain
, in_decl
, false));
11470 return calculate_bases (tsubst_expr (BASES_TYPE (parm_pack
),
11471 args
, complain
, in_decl
, false));
11473 else if (builtin_pack_call_p (parm_pack
))
11475 /* ??? Support use in other patterns. */
11476 gcc_assert (parm_pack
== pattern
);
11477 return expand_builtin_pack_call (parm_pack
, args
,
11478 complain
, in_decl
);
11480 else if (TREE_CODE (parm_pack
) == PARM_DECL
)
11482 /* We know we have correct local_specializations if this
11483 expansion is at function scope, or if we're dealing with a
11484 local parameter in a requires expression; for the latter,
11485 tsubst_requires_expr set it up appropriately. */
11486 if (PACK_EXPANSION_LOCAL_P (t
) || CONSTRAINT_VAR_P (parm_pack
))
11487 arg_pack
= retrieve_local_specialization (parm_pack
);
11489 /* We can't rely on local_specializations for a parameter
11490 name used later in a function declaration (such as in a
11491 late-specified return type). Even if it exists, it might
11492 have the wrong value for a recursive call. */
11493 need_local_specializations
= true;
11497 /* This parameter pack was used in an unevaluated context. Just
11498 make a dummy decl, since it's only used for its type. */
11499 arg_pack
= tsubst_decl (parm_pack
, args
, complain
);
11500 if (arg_pack
&& DECL_PACK_P (arg_pack
))
11501 /* Partial instantiation of the parm_pack, we can't build
11502 up an argument pack yet. */
11503 arg_pack
= NULL_TREE
;
11505 arg_pack
= make_fnparm_pack (arg_pack
);
11508 else if (TREE_CODE (parm_pack
) == FIELD_DECL
)
11509 arg_pack
= tsubst_copy (parm_pack
, args
, complain
, in_decl
);
11513 template_parm_level_and_index (parm_pack
, &level
, &idx
);
11515 if (level
<= levels
)
11516 arg_pack
= TMPL_ARG (args
, level
, idx
);
11519 orig_arg
= arg_pack
;
11520 if (arg_pack
&& TREE_CODE (arg_pack
) == ARGUMENT_PACK_SELECT
)
11521 arg_pack
= ARGUMENT_PACK_SELECT_FROM_PACK (arg_pack
);
11523 if (arg_pack
&& !ARGUMENT_PACK_P (arg_pack
))
11524 /* This can only happen if we forget to expand an argument
11525 pack somewhere else. Just return an error, silently. */
11527 result
= make_tree_vec (1);
11528 TREE_VEC_ELT (result
, 0) = error_mark_node
;
11535 TREE_VEC_LENGTH (ARGUMENT_PACK_ARGS (arg_pack
));
11537 /* Don't bother trying to do a partial substitution with
11538 incomplete packs; we'll try again after deduction. */
11539 if (ARGUMENT_PACK_INCOMPLETE_P (arg_pack
))
11544 else if (len
!= my_len
)
11546 if (!(complain
& tf_error
))
11547 /* Fail quietly. */;
11548 else if (TREE_CODE (t
) == TYPE_PACK_EXPANSION
)
11549 error ("mismatched argument pack lengths while expanding %qT",
11552 error ("mismatched argument pack lengths while expanding %qE",
11554 return error_mark_node
;
11557 /* Keep track of the parameter packs and their corresponding
11559 packs
= tree_cons (parm_pack
, arg_pack
, packs
);
11560 TREE_TYPE (packs
) = orig_arg
;
11564 /* We can't substitute for this parameter pack. We use a flag as
11565 well as the missing_level counter because function parameter
11566 packs don't have a level. */
11567 gcc_assert (processing_template_decl
);
11568 unsubstituted_packs
= true;
11572 /* If the expansion is just T..., return the matching argument pack, unless
11573 we need to call convert_from_reference on all the elements. This is an
11574 important optimization; see c++/68422. */
11575 if (!unsubstituted_packs
11576 && TREE_PURPOSE (packs
) == pattern
)
11578 tree args
= ARGUMENT_PACK_ARGS (TREE_VALUE (packs
));
11579 /* Types need no adjustment, nor does sizeof..., and if we still have
11580 some pack expansion args we won't do anything yet. */
11581 if (TREE_CODE (t
) == TYPE_PACK_EXPANSION
11582 || PACK_EXPANSION_SIZEOF_P (t
)
11583 || pack_expansion_args_count (args
))
11585 /* Also optimize expression pack expansions if we can tell that the
11586 elements won't have reference type. */
11587 tree type
= TREE_TYPE (pattern
);
11588 if (type
&& TREE_CODE (type
) != REFERENCE_TYPE
11589 && !PACK_EXPANSION_P (type
)
11590 && !WILDCARD_TYPE_P (type
))
11592 /* Otherwise use the normal path so we get convert_from_reference. */
11595 /* We cannot expand this expansion expression, because we don't have
11596 all of the argument packs we need. */
11597 if (use_pack_expansion_extra_args_p (packs
, len
, unsubstituted_packs
))
11599 /* We got some full packs, but we can't substitute them in until we
11600 have values for all the packs. So remember these until then. */
11602 t
= make_pack_expansion (pattern
, complain
);
11603 PACK_EXPANSION_EXTRA_ARGS (t
) = args
;
11606 else if (unsubstituted_packs
)
11608 /* There were no real arguments, we're just replacing a parameter
11609 pack with another version of itself. Substitute into the
11610 pattern and return a PACK_EXPANSION_*. The caller will need to
11612 if (TREE_CODE (t
) == EXPR_PACK_EXPANSION
)
11613 t
= tsubst_expr (pattern
, args
, complain
, in_decl
,
11614 /*integral_constant_expression_p=*/false);
11616 t
= tsubst (pattern
, args
, complain
, in_decl
);
11617 t
= make_pack_expansion (t
, complain
);
11621 gcc_assert (len
>= 0);
11623 if (need_local_specializations
)
11625 /* We're in a late-specified return type, so create our own local
11626 specializations map; the current map is either NULL or (in the
11627 case of recursive unification) might have bindings that we don't
11628 want to use or alter. */
11629 saved_local_specializations
= local_specializations
;
11630 local_specializations
= new hash_map
<tree
, tree
>;
11633 /* For each argument in each argument pack, substitute into the
11635 result
= make_tree_vec (len
);
11636 tree elem_args
= copy_template_args (args
);
11637 for (i
= 0; i
< len
; ++i
)
11639 t
= gen_elem_of_pack_expansion_instantiation (pattern
, packs
,
11641 elem_args
, complain
,
11643 TREE_VEC_ELT (result
, i
) = t
;
11644 if (t
== error_mark_node
)
11646 result
= error_mark_node
;
11651 /* Update ARGS to restore the substitution from parameter packs to
11652 their argument packs. */
11653 for (pack
= packs
; pack
; pack
= TREE_CHAIN (pack
))
11655 tree parm
= TREE_PURPOSE (pack
);
11657 if (TREE_CODE (parm
) == PARM_DECL
11658 || TREE_CODE (parm
) == FIELD_DECL
)
11659 register_local_specialization (TREE_TYPE (pack
), parm
);
11664 if (TREE_VALUE (pack
) == NULL_TREE
)
11667 template_parm_level_and_index (parm
, &level
, &idx
);
11669 /* Update the corresponding argument. */
11670 if (TMPL_ARGS_HAVE_MULTIPLE_LEVELS (args
))
11671 TREE_VEC_ELT (TREE_VEC_ELT (args
, level
-1 ), idx
) =
11674 TREE_VEC_ELT (args
, idx
) = TREE_TYPE (pack
);
11678 if (need_local_specializations
)
11680 delete local_specializations
;
11681 local_specializations
= saved_local_specializations
;
11684 /* If the dependent pack arguments were such that we end up with only a
11685 single pack expansion again, there's no need to keep it in a TREE_VEC. */
11686 if (len
== 1 && TREE_CODE (result
) == TREE_VEC
11687 && PACK_EXPANSION_P (TREE_VEC_ELT (result
, 0)))
11688 return TREE_VEC_ELT (result
, 0);
11693 /* Given PARM_DECL PARM, find the corresponding PARM_DECL in the template
11694 TMPL. We do this using DECL_PARM_INDEX, which should work even with
11695 parameter packs; all parms generated from a function parameter pack will
11696 have the same DECL_PARM_INDEX. */
11699 get_pattern_parm (tree parm
, tree tmpl
)
11701 tree pattern
= DECL_TEMPLATE_RESULT (tmpl
);
11704 if (DECL_ARTIFICIAL (parm
))
11706 for (patparm
= DECL_ARGUMENTS (pattern
);
11707 patparm
; patparm
= DECL_CHAIN (patparm
))
11708 if (DECL_ARTIFICIAL (patparm
)
11709 && DECL_NAME (parm
) == DECL_NAME (patparm
))
11714 patparm
= FUNCTION_FIRST_USER_PARM (DECL_TEMPLATE_RESULT (tmpl
));
11715 patparm
= chain_index (DECL_PARM_INDEX (parm
)-1, patparm
);
11716 gcc_assert (DECL_PARM_INDEX (patparm
)
11717 == DECL_PARM_INDEX (parm
));
11723 /* Make an argument pack out of the TREE_VEC VEC. */
11726 make_argument_pack (tree vec
)
11729 tree elt
= TREE_VEC_ELT (vec
, 0);
11731 pack
= cxx_make_type (TYPE_ARGUMENT_PACK
);
11734 pack
= make_node (NONTYPE_ARGUMENT_PACK
);
11735 TREE_CONSTANT (pack
) = 1;
11737 SET_ARGUMENT_PACK_ARGS (pack
, vec
);
11741 /* Return an exact copy of template args T that can be modified
11745 copy_template_args (tree t
)
11747 if (t
== error_mark_node
)
11750 int len
= TREE_VEC_LENGTH (t
);
11751 tree new_vec
= make_tree_vec (len
);
11753 for (int i
= 0; i
< len
; ++i
)
11755 tree elt
= TREE_VEC_ELT (t
, i
);
11756 if (elt
&& TREE_CODE (elt
) == TREE_VEC
)
11757 elt
= copy_template_args (elt
);
11758 TREE_VEC_ELT (new_vec
, i
) = elt
;
11761 NON_DEFAULT_TEMPLATE_ARGS_COUNT (new_vec
)
11762 = NON_DEFAULT_TEMPLATE_ARGS_COUNT (t
);
11767 /* Substitute ARGS into the vector or list of template arguments T. */
11770 tsubst_template_args (tree t
, tree args
, tsubst_flags_t complain
, tree in_decl
)
11773 int len
, need_new
= 0, i
, expanded_len_adjust
= 0, out
;
11776 if (t
== error_mark_node
)
11777 return error_mark_node
;
11779 len
= TREE_VEC_LENGTH (t
);
11780 elts
= XALLOCAVEC (tree
, len
);
11782 for (i
= 0; i
< len
; i
++)
11784 tree orig_arg
= TREE_VEC_ELT (t
, i
);
11787 if (TREE_CODE (orig_arg
) == TREE_VEC
)
11788 new_arg
= tsubst_template_args (orig_arg
, args
, complain
, in_decl
);
11789 else if (PACK_EXPANSION_P (orig_arg
))
11791 /* Substitute into an expansion expression. */
11792 new_arg
= tsubst_pack_expansion (orig_arg
, args
, complain
, in_decl
);
11794 if (TREE_CODE (new_arg
) == TREE_VEC
)
11795 /* Add to the expanded length adjustment the number of
11796 expanded arguments. We subtract one from this
11797 measurement, because the argument pack expression
11798 itself is already counted as 1 in
11799 LEN. EXPANDED_LEN_ADJUST can actually be negative, if
11800 the argument pack is empty. */
11801 expanded_len_adjust
+= TREE_VEC_LENGTH (new_arg
) - 1;
11803 else if (ARGUMENT_PACK_P (orig_arg
))
11805 /* Substitute into each of the arguments. */
11806 new_arg
= TYPE_P (orig_arg
)
11807 ? cxx_make_type (TREE_CODE (orig_arg
))
11808 : make_node (TREE_CODE (orig_arg
));
11810 tree pack_args
= tsubst_template_args (ARGUMENT_PACK_ARGS (orig_arg
),
11811 args
, complain
, in_decl
);
11812 if (pack_args
== error_mark_node
)
11813 new_arg
= error_mark_node
;
11815 SET_ARGUMENT_PACK_ARGS (new_arg
, pack_args
);
11817 if (TREE_CODE (new_arg
) == NONTYPE_ARGUMENT_PACK
)
11818 TREE_CONSTANT (new_arg
) = TREE_CONSTANT (orig_arg
);
11821 new_arg
= tsubst_template_arg (orig_arg
, args
, complain
, in_decl
);
11823 if (new_arg
== error_mark_node
)
11824 return error_mark_node
;
11827 if (new_arg
!= orig_arg
)
11834 /* Make space for the expanded arguments coming from template
11836 t
= make_tree_vec (len
+ expanded_len_adjust
);
11837 /* ORIG_T can contain TREE_VECs. That happens if ORIG_T contains the
11838 arguments for a member template.
11839 In that case each TREE_VEC in ORIG_T represents a level of template
11840 arguments, and ORIG_T won't carry any non defaulted argument count.
11841 It will rather be the nested TREE_VECs that will carry one.
11842 In other words, ORIG_T carries a non defaulted argument count only
11843 if it doesn't contain any nested TREE_VEC. */
11844 if (NON_DEFAULT_TEMPLATE_ARGS_COUNT (orig_t
))
11846 int count
= GET_NON_DEFAULT_TEMPLATE_ARGS_COUNT (orig_t
);
11847 count
+= expanded_len_adjust
;
11848 SET_NON_DEFAULT_TEMPLATE_ARGS_COUNT (t
, count
);
11850 for (i
= 0, out
= 0; i
< len
; i
++)
11852 if ((PACK_EXPANSION_P (TREE_VEC_ELT (orig_t
, i
))
11853 || ARGUMENT_PACK_P (TREE_VEC_ELT (orig_t
, i
)))
11854 && TREE_CODE (elts
[i
]) == TREE_VEC
)
11858 /* Now expand the template argument pack "in place". */
11859 for (idx
= 0; idx
< TREE_VEC_LENGTH (elts
[i
]); idx
++, out
++)
11860 TREE_VEC_ELT (t
, out
) = TREE_VEC_ELT (elts
[i
], idx
);
11864 TREE_VEC_ELT (t
, out
) = elts
[i
];
11872 /* Substitute ARGS into one level PARMS of template parameters. */
11875 tsubst_template_parms_level (tree parms
, tree args
, tsubst_flags_t complain
)
11877 if (parms
== error_mark_node
)
11878 return error_mark_node
;
11880 tree new_vec
= make_tree_vec (TREE_VEC_LENGTH (parms
));
11882 for (int i
= 0; i
< TREE_VEC_LENGTH (new_vec
); ++i
)
11884 tree tuple
= TREE_VEC_ELT (parms
, i
);
11886 if (tuple
== error_mark_node
)
11889 TREE_VEC_ELT (new_vec
, i
) =
11890 tsubst_template_parm (tuple
, args
, complain
);
11896 /* Return the result of substituting ARGS into the template parameters
11897 given by PARMS. If there are m levels of ARGS and m + n levels of
11898 PARMS, then the result will contain n levels of PARMS. For
11899 example, if PARMS is `template <class T> template <class U>
11900 template <T*, U, class V>' and ARGS is {{int}, {double}} then the
11901 result will be `template <int*, double, class V>'. */
11904 tsubst_template_parms (tree parms
, tree args
, tsubst_flags_t complain
)
11906 tree r
= NULL_TREE
;
11909 /* When substituting into a template, we must set
11910 PROCESSING_TEMPLATE_DECL as the template parameters may be
11911 dependent if they are based on one-another, and the dependency
11912 predicates are short-circuit outside of templates. */
11913 ++processing_template_decl
;
11915 for (new_parms
= &r
;
11916 parms
&& TMPL_PARMS_DEPTH (parms
) > TMPL_ARGS_DEPTH (args
);
11917 new_parms
= &(TREE_CHAIN (*new_parms
)),
11918 parms
= TREE_CHAIN (parms
))
11920 tree new_vec
= tsubst_template_parms_level (TREE_VALUE (parms
),
11923 tree_cons (size_int (TMPL_PARMS_DEPTH (parms
)
11924 - TMPL_ARGS_DEPTH (args
)),
11925 new_vec
, NULL_TREE
);
11928 --processing_template_decl
;
11933 /* Return the result of substituting ARGS into one template parameter
11934 given by T. T Must be a TREE_LIST which TREE_VALUE is the template
11935 parameter and which TREE_PURPOSE is the default argument of the
11936 template parameter. */
11939 tsubst_template_parm (tree t
, tree args
, tsubst_flags_t complain
)
11941 tree default_value
, parm_decl
;
11943 if (args
== NULL_TREE
11945 || t
== error_mark_node
)
11948 gcc_assert (TREE_CODE (t
) == TREE_LIST
);
11950 default_value
= TREE_PURPOSE (t
);
11951 parm_decl
= TREE_VALUE (t
);
11953 parm_decl
= tsubst (parm_decl
, args
, complain
, NULL_TREE
);
11954 if (TREE_CODE (parm_decl
) == PARM_DECL
11955 && invalid_nontype_parm_type_p (TREE_TYPE (parm_decl
), complain
))
11956 parm_decl
= error_mark_node
;
11957 default_value
= tsubst_template_arg (default_value
, args
,
11958 complain
, NULL_TREE
);
11960 return build_tree_list (default_value
, parm_decl
);
11963 /* Substitute the ARGS into the indicated aggregate (or enumeration)
11964 type T. If T is not an aggregate or enumeration type, it is
11965 handled as if by tsubst. IN_DECL is as for tsubst. If
11966 ENTERING_SCOPE is nonzero, T is the context for a template which
11967 we are presently tsubst'ing. Return the substituted value. */
11970 tsubst_aggr_type (tree t
,
11972 tsubst_flags_t complain
,
11974 int entering_scope
)
11976 if (t
== NULL_TREE
)
11979 switch (TREE_CODE (t
))
11982 if (TYPE_PTRMEMFUNC_P (t
))
11983 return tsubst (TYPE_PTRMEMFUNC_FN_TYPE (t
), args
, complain
, in_decl
);
11985 /* Fall through. */
11986 case ENUMERAL_TYPE
:
11988 if (TYPE_TEMPLATE_INFO (t
) && uses_template_parms (t
))
11993 int saved_unevaluated_operand
;
11994 int saved_inhibit_evaluation_warnings
;
11996 /* In "sizeof(X<I>)" we need to evaluate "I". */
11997 saved_unevaluated_operand
= cp_unevaluated_operand
;
11998 cp_unevaluated_operand
= 0;
11999 saved_inhibit_evaluation_warnings
= c_inhibit_evaluation_warnings
;
12000 c_inhibit_evaluation_warnings
= 0;
12002 /* First, determine the context for the type we are looking
12004 context
= TYPE_CONTEXT (t
);
12005 if (context
&& TYPE_P (context
))
12007 context
= tsubst_aggr_type (context
, args
, complain
,
12008 in_decl
, /*entering_scope=*/1);
12009 /* If context is a nested class inside a class template,
12010 it may still need to be instantiated (c++/33959). */
12011 context
= complete_type (context
);
12014 /* Then, figure out what arguments are appropriate for the
12015 type we are trying to find. For example, given:
12017 template <class T> struct S;
12018 template <class T, class U> void f(T, U) { S<U> su; }
12020 and supposing that we are instantiating f<int, double>,
12021 then our ARGS will be {int, double}, but, when looking up
12022 S we only want {double}. */
12023 argvec
= tsubst_template_args (TYPE_TI_ARGS (t
), args
,
12024 complain
, in_decl
);
12025 if (argvec
== error_mark_node
)
12026 r
= error_mark_node
;
12029 r
= lookup_template_class (t
, argvec
, in_decl
, context
,
12030 entering_scope
, complain
);
12031 r
= cp_build_qualified_type_real (r
, cp_type_quals (t
), complain
);
12034 cp_unevaluated_operand
= saved_unevaluated_operand
;
12035 c_inhibit_evaluation_warnings
= saved_inhibit_evaluation_warnings
;
12040 /* This is not a template type, so there's nothing to do. */
12044 return tsubst (t
, args
, complain
, in_decl
);
12048 static GTY((cache
)) tree_cache_map
*defarg_inst
;
12050 /* Substitute into the default argument ARG (a default argument for
12051 FN), which has the indicated TYPE. */
12054 tsubst_default_argument (tree fn
, int parmnum
, tree type
, tree arg
,
12055 tsubst_flags_t complain
)
12057 tree saved_class_ptr
= NULL_TREE
;
12058 tree saved_class_ref
= NULL_TREE
;
12059 int errs
= errorcount
+ sorrycount
;
12061 /* This can happen in invalid code. */
12062 if (TREE_CODE (arg
) == DEFAULT_ARG
)
12065 tree parm
= FUNCTION_FIRST_USER_PARM (fn
);
12066 parm
= chain_index (parmnum
, parm
);
12067 tree parmtype
= TREE_TYPE (parm
);
12068 if (DECL_BY_REFERENCE (parm
))
12069 parmtype
= TREE_TYPE (parmtype
);
12070 gcc_assert (same_type_ignoring_top_level_qualifiers_p (type
, parmtype
));
12073 if (defarg_inst
&& (slot
= defarg_inst
->get (parm
)))
12076 /* This default argument came from a template. Instantiate the
12077 default argument here, not in tsubst. In the case of
12086 we must be careful to do name lookup in the scope of S<T>,
12087 rather than in the current class. */
12088 push_access_scope (fn
);
12089 /* The "this" pointer is not valid in a default argument. */
12092 saved_class_ptr
= current_class_ptr
;
12093 cp_function_chain
->x_current_class_ptr
= NULL_TREE
;
12094 saved_class_ref
= current_class_ref
;
12095 cp_function_chain
->x_current_class_ref
= NULL_TREE
;
12098 start_lambda_scope (parm
);
12100 push_deferring_access_checks(dk_no_deferred
);
12101 /* The default argument expression may cause implicitly defined
12102 member functions to be synthesized, which will result in garbage
12103 collection. We must treat this situation as if we were within
12104 the body of function so as to avoid collecting live data on the
12107 arg
= tsubst_expr (arg
, DECL_TI_ARGS (fn
),
12108 complain
, NULL_TREE
,
12109 /*integral_constant_expression_p=*/false);
12111 pop_deferring_access_checks();
12113 finish_lambda_scope ();
12115 /* Restore the "this" pointer. */
12118 cp_function_chain
->x_current_class_ptr
= saved_class_ptr
;
12119 cp_function_chain
->x_current_class_ref
= saved_class_ref
;
12122 if (errorcount
+sorrycount
> errs
12123 && (complain
& tf_warning_or_error
))
12124 inform (input_location
,
12125 " when instantiating default argument for call to %qD", fn
);
12127 /* Make sure the default argument is reasonable. */
12128 arg
= check_default_argument (type
, arg
, complain
);
12130 pop_access_scope (fn
);
12132 if (arg
!= error_mark_node
&& !cp_unevaluated_operand
)
12135 defarg_inst
= tree_cache_map::create_ggc (37);
12136 defarg_inst
->put (parm
, arg
);
12142 /* Substitute into all the default arguments for FN. */
12145 tsubst_default_arguments (tree fn
, tsubst_flags_t complain
)
12150 tmpl_args
= DECL_TI_ARGS (fn
);
12152 /* If this function is not yet instantiated, we certainly don't need
12153 its default arguments. */
12154 if (uses_template_parms (tmpl_args
))
12156 /* Don't do this again for clones. */
12157 if (DECL_CLONED_FUNCTION_P (fn
))
12161 for (arg
= TYPE_ARG_TYPES (TREE_TYPE (fn
));
12163 arg
= TREE_CHAIN (arg
), ++i
)
12164 if (TREE_PURPOSE (arg
))
12165 TREE_PURPOSE (arg
) = tsubst_default_argument (fn
, i
,
12167 TREE_PURPOSE (arg
),
12171 /* Subroutine of tsubst_decl for the case when T is a FUNCTION_DECL. */
12174 tsubst_function_decl (tree t
, tree args
, tsubst_flags_t complain
,
12175 tree lambda_fntype
)
12177 tree gen_tmpl
, argvec
;
12178 hashval_t hash
= 0;
12181 /* Nobody should be tsubst'ing into non-template functions. */
12182 gcc_assert (DECL_TEMPLATE_INFO (t
) != NULL_TREE
);
12184 if (TREE_CODE (DECL_TI_TEMPLATE (t
)) == TEMPLATE_DECL
)
12186 /* If T is not dependent, just return it. */
12187 if (!uses_template_parms (DECL_TI_ARGS (t
)))
12190 /* Calculate the most general template of which R is a
12191 specialization, and the complete set of arguments used to
12193 gen_tmpl
= most_general_template (DECL_TI_TEMPLATE (t
));
12194 argvec
= tsubst_template_args (DECL_TI_ARGS
12195 (DECL_TEMPLATE_RESULT
12196 (DECL_TI_TEMPLATE (t
))),
12197 args
, complain
, in_decl
);
12198 if (argvec
== error_mark_node
)
12199 return error_mark_node
;
12201 /* Check to see if we already have this specialization. */
12202 if (!lambda_fntype
)
12204 hash
= hash_tmpl_and_args (gen_tmpl
, argvec
);
12205 if (tree spec
= retrieve_specialization (gen_tmpl
, argvec
, hash
))
12209 /* We can see more levels of arguments than parameters if
12210 there was a specialization of a member template, like
12213 template <class T> struct S { template <class U> void f(); }
12214 template <> template <class U> void S<int>::f(U);
12216 Here, we'll be substituting into the specialization,
12217 because that's where we can find the code we actually
12218 want to generate, but we'll have enough arguments for
12219 the most general template.
12221 We also deal with the peculiar case:
12223 template <class T> struct S {
12224 template <class U> friend void f();
12226 template <class U> void f() {}
12228 template void f<double>();
12230 Here, the ARGS for the instantiation of will be {int,
12231 double}. But, we only need as many ARGS as there are
12232 levels of template parameters in CODE_PATTERN. We are
12233 careful not to get fooled into reducing the ARGS in
12236 template <class T> struct S { template <class U> void f(U); }
12237 template <class T> template <> void S<T>::f(int) {}
12239 which we can spot because the pattern will be a
12240 specialization in this case. */
12241 int args_depth
= TMPL_ARGS_DEPTH (args
);
12243 TMPL_PARMS_DEPTH (DECL_TEMPLATE_PARMS (DECL_TI_TEMPLATE (t
)));
12245 if (args_depth
> parms_depth
&& !DECL_TEMPLATE_SPECIALIZATION (t
))
12246 args
= get_innermost_template_args (args
, parms_depth
);
12250 /* This special case arises when we have something like this:
12252 template <class T> struct S {
12253 friend void f<int>(int, double);
12256 Here, the DECL_TI_TEMPLATE for the friend declaration
12257 will be an IDENTIFIER_NODE. We are being called from
12258 tsubst_friend_function, and we want only to create a
12259 new decl (R) with appropriate types so that we can call
12260 determine_specialization. */
12261 gen_tmpl
= NULL_TREE
;
12262 argvec
= NULL_TREE
;
12265 tree closure
= (lambda_fntype
? TYPE_METHOD_BASETYPE (lambda_fntype
)
12267 tree ctx
= closure
? closure
: DECL_CONTEXT (t
);
12268 bool member
= ctx
&& TYPE_P (ctx
);
12270 if (member
&& !closure
)
12271 ctx
= tsubst_aggr_type (ctx
, args
,
12272 complain
, t
, /*entering_scope=*/1);
12274 tree type
= (lambda_fntype
? lambda_fntype
12275 : tsubst (TREE_TYPE (t
), args
,
12276 complain
| tf_fndecl_type
, in_decl
));
12277 if (type
== error_mark_node
)
12278 return error_mark_node
;
12280 /* If we hit excessive deduction depth, the type is bogus even if
12281 it isn't error_mark_node, so don't build a decl. */
12282 if (excessive_deduction_depth
)
12283 return error_mark_node
;
12285 /* We do NOT check for matching decls pushed separately at this
12286 point, as they may not represent instantiations of this
12287 template, and in any case are considered separate under the
12289 tree r
= copy_decl (t
);
12290 DECL_USE_TEMPLATE (r
) = 0;
12291 TREE_TYPE (r
) = type
;
12292 /* Clear out the mangled name and RTL for the instantiation. */
12293 SET_DECL_ASSEMBLER_NAME (r
, NULL_TREE
);
12294 SET_DECL_RTL (r
, NULL
);
12295 /* Leave DECL_INITIAL set on deleted instantiations. */
12296 if (!DECL_DELETED_FN (r
))
12297 DECL_INITIAL (r
) = NULL_TREE
;
12298 DECL_CONTEXT (r
) = ctx
;
12300 /* OpenMP UDRs have the only argument a reference to the declared
12301 type. We want to diagnose if the declared type is a reference,
12302 which is invalid, but as references to references are usually
12303 quietly merged, diagnose it here. */
12304 if (DECL_OMP_DECLARE_REDUCTION_P (t
))
12307 = TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (t
))));
12308 argtype
= tsubst (argtype
, args
, complain
, in_decl
);
12309 if (TREE_CODE (argtype
) == REFERENCE_TYPE
)
12310 error_at (DECL_SOURCE_LOCATION (t
),
12311 "reference type %qT in "
12312 "%<#pragma omp declare reduction%>", argtype
);
12313 if (strchr (IDENTIFIER_POINTER (DECL_NAME (t
)), '~') == NULL
)
12314 DECL_NAME (r
) = omp_reduction_id (ERROR_MARK
, DECL_NAME (t
),
12318 if (member
&& DECL_CONV_FN_P (r
))
12319 /* Type-conversion operator. Reconstruct the name, in
12320 case it's the name of one of the template's parameters. */
12321 DECL_NAME (r
) = make_conv_op_name (TREE_TYPE (type
));
12323 tree parms
= DECL_ARGUMENTS (t
);
12325 parms
= DECL_CHAIN (parms
);
12326 parms
= tsubst (parms
, args
, complain
, t
);
12327 for (tree parm
= parms
; parm
; parm
= DECL_CHAIN (parm
))
12328 DECL_CONTEXT (parm
) = r
;
12331 tree tparm
= build_this_parm (r
, closure
, type_memfn_quals (type
));
12332 DECL_CHAIN (tparm
) = parms
;
12335 DECL_ARGUMENTS (r
) = parms
;
12336 DECL_RESULT (r
) = NULL_TREE
;
12338 TREE_STATIC (r
) = 0;
12339 TREE_PUBLIC (r
) = TREE_PUBLIC (t
);
12340 DECL_EXTERNAL (r
) = 1;
12341 /* If this is an instantiation of a function with internal
12342 linkage, we already know what object file linkage will be
12343 assigned to the instantiation. */
12344 DECL_INTERFACE_KNOWN (r
) = !TREE_PUBLIC (r
);
12345 DECL_DEFER_OUTPUT (r
) = 0;
12346 DECL_CHAIN (r
) = NULL_TREE
;
12347 DECL_PENDING_INLINE_INFO (r
) = 0;
12348 DECL_PENDING_INLINE_P (r
) = 0;
12349 DECL_SAVED_TREE (r
) = NULL_TREE
;
12350 DECL_STRUCT_FUNCTION (r
) = NULL
;
12352 /* We'll re-clone as appropriate in instantiate_template. */
12353 DECL_CLONED_FUNCTION (r
) = NULL_TREE
;
12355 /* If we aren't complaining now, return on error before we register
12356 the specialization so that we'll complain eventually. */
12357 if ((complain
& tf_error
) == 0
12358 && IDENTIFIER_ANY_OP_P (DECL_NAME (r
))
12359 && !grok_op_properties (r
, /*complain=*/false))
12360 return error_mark_node
;
12362 /* When instantiating a constrained member, substitute
12363 into the constraints to create a new constraint. */
12364 if (tree ci
= get_constraints (t
))
12367 ci
= tsubst_constraint_info (ci
, argvec
, complain
, NULL_TREE
);
12368 set_constraints (r
, ci
);
12371 /* Set up the DECL_TEMPLATE_INFO for R. There's no need to do
12372 this in the special friend case mentioned above where
12373 GEN_TMPL is NULL. */
12374 if (gen_tmpl
&& !closure
)
12376 DECL_TEMPLATE_INFO (r
)
12377 = build_template_info (gen_tmpl
, argvec
);
12378 SET_DECL_IMPLICIT_INSTANTIATION (r
);
12381 = register_specialization (r
, gen_tmpl
, argvec
, false, hash
);
12383 /* We instantiated this while substituting into
12384 the type earlier (template/friend54.C). */
12387 /* We're not supposed to instantiate default arguments
12388 until they are called, for a template. But, for a
12391 template <class T> void f ()
12392 { extern void g(int i = T()); }
12394 we should do the substitution when the template is
12395 instantiated. We handle the member function case in
12396 instantiate_class_template since the default arguments
12397 might refer to other members of the class. */
12399 && !PRIMARY_TEMPLATE_P (gen_tmpl
)
12400 && !uses_template_parms (argvec
))
12401 tsubst_default_arguments (r
, complain
);
12404 DECL_TEMPLATE_INFO (r
) = NULL_TREE
;
12406 /* Copy the list of befriending classes. */
12407 for (tree
*friends
= &DECL_BEFRIENDING_CLASSES (r
);
12409 friends
= &TREE_CHAIN (*friends
))
12411 *friends
= copy_node (*friends
);
12412 TREE_VALUE (*friends
)
12413 = tsubst (TREE_VALUE (*friends
), args
, complain
, in_decl
);
12416 if (DECL_CONSTRUCTOR_P (r
) || DECL_DESTRUCTOR_P (r
))
12418 maybe_retrofit_in_chrg (r
);
12419 if (DECL_CONSTRUCTOR_P (r
) && !grok_ctor_properties (ctx
, r
))
12420 return error_mark_node
;
12421 /* If this is an instantiation of a member template, clone it.
12422 If it isn't, that'll be handled by
12423 clone_constructors_and_destructors. */
12424 if (PRIMARY_TEMPLATE_P (gen_tmpl
))
12425 clone_function_decl (r
, /*update_methods=*/false);
12427 else if ((complain
& tf_error
) != 0
12428 && IDENTIFIER_ANY_OP_P (DECL_NAME (r
))
12429 && !grok_op_properties (r
, /*complain=*/true))
12430 return error_mark_node
;
12432 if (DECL_FRIEND_P (t
) && DECL_FRIEND_CONTEXT (t
))
12433 SET_DECL_FRIEND_CONTEXT (r
,
12434 tsubst (DECL_FRIEND_CONTEXT (t
),
12435 args
, complain
, in_decl
));
12437 /* Possibly limit visibility based on template args. */
12438 DECL_VISIBILITY (r
) = VISIBILITY_DEFAULT
;
12439 if (DECL_VISIBILITY_SPECIFIED (t
))
12441 DECL_VISIBILITY_SPECIFIED (r
) = 0;
12442 DECL_ATTRIBUTES (r
)
12443 = remove_attribute ("visibility", DECL_ATTRIBUTES (r
));
12445 determine_visibility (r
);
12446 if (DECL_DEFAULTED_OUTSIDE_CLASS_P (r
)
12447 && !processing_template_decl
)
12448 defaulted_late_check (r
);
12450 apply_late_template_attributes (&r
, DECL_ATTRIBUTES (r
), 0,
12451 args
, complain
, in_decl
);
12455 /* Subroutine of tsubst_decl for the case when T is a TEMPLATE_DECL. */
12458 tsubst_template_decl (tree t
, tree args
, tsubst_flags_t complain
,
12459 tree lambda_fntype
)
12461 /* We can get here when processing a member function template,
12462 member class template, or template template parameter. */
12463 tree decl
= DECL_TEMPLATE_RESULT (t
);
12469 hashval_t hash
= 0;
12471 if (DECL_TEMPLATE_TEMPLATE_PARM_P (t
))
12473 /* Template template parameter is treated here. */
12474 tree new_type
= tsubst (TREE_TYPE (t
), args
, complain
, in_decl
);
12475 if (new_type
== error_mark_node
)
12476 r
= error_mark_node
;
12477 /* If we get a real template back, return it. This can happen in
12478 the context of most_specialized_partial_spec. */
12479 else if (TREE_CODE (new_type
) == TEMPLATE_DECL
)
12482 /* The new TEMPLATE_DECL was built in
12483 reduce_template_parm_level. */
12484 r
= TEMPLATE_TEMPLATE_PARM_TEMPLATE_DECL (new_type
);
12488 if (!lambda_fntype
)
12490 /* We might already have an instance of this template.
12491 The ARGS are for the surrounding class type, so the
12492 full args contain the tsubst'd args for the context,
12493 plus the innermost args from the template decl. */
12494 tmpl_args
= DECL_CLASS_TEMPLATE_P (t
)
12495 ? CLASSTYPE_TI_ARGS (TREE_TYPE (t
))
12496 : DECL_TI_ARGS (DECL_TEMPLATE_RESULT (t
));
12497 /* Because this is a template, the arguments will still be
12498 dependent, even after substitution. If
12499 PROCESSING_TEMPLATE_DECL is not set, the dependency
12500 predicates will short-circuit. */
12501 ++processing_template_decl
;
12502 full_args
= tsubst_template_args (tmpl_args
, args
,
12503 complain
, in_decl
);
12504 --processing_template_decl
;
12505 if (full_args
== error_mark_node
)
12506 return error_mark_node
;
12508 /* If this is a default template template argument,
12509 tsubst might not have changed anything. */
12510 if (full_args
== tmpl_args
)
12513 hash
= hash_tmpl_and_args (t
, full_args
);
12514 spec
= retrieve_specialization (t
, full_args
, hash
);
12515 if (spec
!= NULL_TREE
)
12519 /* Make a new template decl. It will be similar to the
12520 original, but will record the current template arguments.
12521 We also create a new function declaration, which is just
12522 like the old one, but points to this new template, rather
12523 than the old one. */
12525 gcc_assert (DECL_LANG_SPECIFIC (r
) != 0);
12526 DECL_CHAIN (r
) = NULL_TREE
;
12528 // Build new template info linking to the original template decl.
12529 if (!lambda_fntype
)
12531 DECL_TEMPLATE_INFO (r
) = build_template_info (t
, args
);
12532 SET_DECL_IMPLICIT_INSTANTIATION (r
);
12535 DECL_TEMPLATE_INFO (r
) = NULL_TREE
;
12537 /* The template parameters for this new template are all the
12538 template parameters for the old template, except the
12539 outermost level of parameters. */
12540 DECL_TEMPLATE_PARMS (r
)
12541 = tsubst_template_parms (DECL_TEMPLATE_PARMS (t
), args
,
12544 if (TREE_CODE (decl
) == TYPE_DECL
12545 && !TYPE_DECL_ALIAS_P (decl
))
12548 ++processing_template_decl
;
12549 new_type
= tsubst (TREE_TYPE (t
), args
, complain
, in_decl
);
12550 --processing_template_decl
;
12551 if (new_type
== error_mark_node
)
12552 return error_mark_node
;
12554 TREE_TYPE (r
) = new_type
;
12555 /* For a partial specialization, we need to keep pointing to
12556 the primary template. */
12557 if (!DECL_TEMPLATE_SPECIALIZATION (t
))
12558 CLASSTYPE_TI_TEMPLATE (new_type
) = r
;
12559 DECL_TEMPLATE_RESULT (r
) = TYPE_MAIN_DECL (new_type
);
12560 DECL_TI_ARGS (r
) = CLASSTYPE_TI_ARGS (new_type
);
12561 DECL_CONTEXT (r
) = TYPE_CONTEXT (new_type
);
12566 ++processing_template_decl
;
12567 if (TREE_CODE (decl
) == FUNCTION_DECL
)
12568 new_decl
= tsubst_function_decl (decl
, args
, complain
, lambda_fntype
);
12570 new_decl
= tsubst (decl
, args
, complain
, in_decl
);
12571 --processing_template_decl
;
12572 if (new_decl
== error_mark_node
)
12573 return error_mark_node
;
12575 DECL_TEMPLATE_RESULT (r
) = new_decl
;
12576 TREE_TYPE (r
) = TREE_TYPE (new_decl
);
12577 DECL_CONTEXT (r
) = DECL_CONTEXT (new_decl
);
12580 tree args
= template_parms_to_args (DECL_TEMPLATE_PARMS (r
));
12581 DECL_TEMPLATE_INFO (new_decl
) = build_template_info (r
, args
);
12585 DECL_TI_TEMPLATE (new_decl
) = r
;
12586 DECL_TI_ARGS (r
) = DECL_TI_ARGS (new_decl
);
12590 DECL_TEMPLATE_INSTANTIATIONS (r
) = NULL_TREE
;
12591 DECL_TEMPLATE_SPECIALIZATIONS (r
) = NULL_TREE
;
12593 if (PRIMARY_TEMPLATE_P (t
))
12594 DECL_PRIMARY_TEMPLATE (r
) = r
;
12596 if (TREE_CODE (decl
) != TYPE_DECL
&& !VAR_P (decl
)
12598 /* Record this non-type partial instantiation. */
12599 register_specialization (r
, t
,
12600 DECL_TI_ARGS (DECL_TEMPLATE_RESULT (r
)),
12606 /* True if FN is the op() for a lambda in an uninstantiated template. */
12609 lambda_fn_in_template_p (tree fn
)
12611 if (!fn
|| !LAMBDA_FUNCTION_P (fn
))
12613 tree closure
= DECL_CONTEXT (fn
);
12614 return CLASSTYPE_TEMPLATE_INFO (closure
) != NULL_TREE
;
12617 /* True if FN is the op() for a lambda regenerated from a lambda in an
12618 uninstantiated template. */
12621 regenerated_lambda_fn_p (tree fn
)
12623 return (LAMBDA_FUNCTION_P (fn
)
12624 && !DECL_TEMPLATE_INSTANTIATION (fn
));
12627 /* We're instantiating a variable from template function TCTX. Return the
12628 corresponding current enclosing scope. This gets complicated because lambda
12629 functions in templates are regenerated rather than instantiated, but generic
12630 lambda functions are subsequently instantiated. */
12633 enclosing_instantiation_of (tree tctx
)
12635 tree fn
= current_function_decl
;
12636 int lambda_count
= 0;
12638 for (; tctx
&& lambda_fn_in_template_p (tctx
);
12639 tctx
= decl_function_context (tctx
))
12641 for (; fn
; fn
= decl_function_context (fn
))
12644 int flambda_count
= 0;
12645 for (; fn
&& regenerated_lambda_fn_p (fn
);
12646 fn
= decl_function_context (fn
))
12648 if (DECL_TEMPLATE_INFO (fn
)
12649 ? most_general_template (fn
) != most_general_template (tctx
)
12655 while (flambda_count
-- > lambda_count
)
12656 fn
= decl_function_context (fn
);
12660 gcc_unreachable ();
12663 /* Substitute the ARGS into the T, which is a _DECL. Return the
12664 result of the substitution. Issue error and warning messages under
12665 control of COMPLAIN. */
12668 tsubst_decl (tree t
, tree args
, tsubst_flags_t complain
)
12670 #define RETURN(EXP) do { r = (EXP); goto out; } while(0)
12671 location_t saved_loc
;
12672 tree r
= NULL_TREE
;
12674 hashval_t hash
= 0;
12676 /* Set the filename and linenumber to improve error-reporting. */
12677 saved_loc
= input_location
;
12678 input_location
= DECL_SOURCE_LOCATION (t
);
12680 switch (TREE_CODE (t
))
12682 case TEMPLATE_DECL
:
12683 r
= tsubst_template_decl (t
, args
, complain
, /*lambda*/NULL_TREE
);
12686 case FUNCTION_DECL
:
12687 r
= tsubst_function_decl (t
, args
, complain
, /*lambda*/NULL_TREE
);
12692 tree type
= NULL_TREE
;
12694 tree expanded_types
= NULL_TREE
;
12695 tree prev_r
= NULL_TREE
;
12696 tree first_r
= NULL_TREE
;
12698 if (DECL_PACK_P (t
))
12700 /* If there is a local specialization that isn't a
12701 parameter pack, it means that we're doing a "simple"
12702 substitution from inside tsubst_pack_expansion. Just
12703 return the local specialization (which will be a single
12705 tree spec
= retrieve_local_specialization (t
);
12707 && TREE_CODE (spec
) == PARM_DECL
12708 && TREE_CODE (TREE_TYPE (spec
)) != TYPE_PACK_EXPANSION
)
12711 /* Expand the TYPE_PACK_EXPANSION that provides the types for
12712 the parameters in this function parameter pack. */
12713 expanded_types
= tsubst_pack_expansion (TREE_TYPE (t
), args
,
12714 complain
, in_decl
);
12715 if (TREE_CODE (expanded_types
) == TREE_VEC
)
12717 len
= TREE_VEC_LENGTH (expanded_types
);
12719 /* Zero-length parameter packs are boring. Just substitute
12722 RETURN (tsubst (TREE_CHAIN (t
), args
, complain
,
12727 /* All we did was update the type. Make a note of that. */
12728 type
= expanded_types
;
12729 expanded_types
= NULL_TREE
;
12733 /* Loop through all of the parameters we'll build. When T is
12734 a function parameter pack, LEN is the number of expanded
12735 types in EXPANDED_TYPES; otherwise, LEN is 1. */
12737 for (i
= 0; i
< len
; ++i
)
12741 if (DECL_TEMPLATE_PARM_P (t
))
12742 SET_DECL_TEMPLATE_PARM_P (r
);
12744 if (expanded_types
)
12745 /* We're on the Ith parameter of the function parameter
12748 /* Get the Ith type. */
12749 type
= TREE_VEC_ELT (expanded_types
, i
);
12751 /* Rename the parameter to include the index. */
12753 = make_ith_pack_parameter_name (DECL_NAME (r
), i
);
12756 /* We're dealing with a normal parameter. */
12757 type
= tsubst (TREE_TYPE (t
), args
, complain
, in_decl
);
12759 type
= type_decays_to (type
);
12760 TREE_TYPE (r
) = type
;
12761 cp_apply_type_quals_to_decl (cp_type_quals (type
), r
);
12763 if (DECL_INITIAL (r
))
12765 if (TREE_CODE (DECL_INITIAL (r
)) != TEMPLATE_PARM_INDEX
)
12766 DECL_INITIAL (r
) = TREE_TYPE (r
);
12768 DECL_INITIAL (r
) = tsubst (DECL_INITIAL (r
), args
,
12769 complain
, in_decl
);
12772 DECL_CONTEXT (r
) = NULL_TREE
;
12774 if (!DECL_TEMPLATE_PARM_P (r
))
12775 DECL_ARG_TYPE (r
) = type_passed_as (type
);
12777 apply_late_template_attributes (&r
, DECL_ATTRIBUTES (r
), 0,
12778 args
, complain
, in_decl
);
12780 /* Keep track of the first new parameter we
12781 generate. That's what will be returned to the
12786 /* Build a proper chain of parameters when substituting
12787 into a function parameter pack. */
12789 DECL_CHAIN (prev_r
) = r
;
12792 /* If cp_unevaluated_operand is set, we're just looking for a
12793 single dummy parameter, so don't keep going. */
12794 if (DECL_CHAIN (t
) && !cp_unevaluated_operand
)
12795 DECL_CHAIN (r
) = tsubst (DECL_CHAIN (t
), args
,
12796 complain
, DECL_CHAIN (t
));
12798 /* FIRST_R contains the start of the chain we've built. */
12805 tree type
= NULL_TREE
;
12806 tree vec
= NULL_TREE
;
12807 tree expanded_types
= NULL_TREE
;
12810 if (PACK_EXPANSION_P (TREE_TYPE (t
)))
12812 /* This field is a lambda capture pack. Return a TREE_VEC of
12813 the expanded fields to instantiate_class_template_1 and
12814 store them in the specializations hash table as a
12815 NONTYPE_ARGUMENT_PACK so that tsubst_copy can find them. */
12816 expanded_types
= tsubst_pack_expansion (TREE_TYPE (t
), args
,
12817 complain
, in_decl
);
12818 if (TREE_CODE (expanded_types
) == TREE_VEC
)
12820 len
= TREE_VEC_LENGTH (expanded_types
);
12821 vec
= make_tree_vec (len
);
12825 /* All we did was update the type. Make a note of that. */
12826 type
= expanded_types
;
12827 expanded_types
= NULL_TREE
;
12831 for (int i
= 0; i
< len
; ++i
)
12834 if (expanded_types
)
12836 type
= TREE_VEC_ELT (expanded_types
, i
);
12838 = make_ith_pack_parameter_name (DECL_NAME (r
), i
);
12841 type
= tsubst (TREE_TYPE (t
), args
, complain
, in_decl
);
12843 if (type
== error_mark_node
)
12844 RETURN (error_mark_node
);
12845 TREE_TYPE (r
) = type
;
12846 cp_apply_type_quals_to_decl (cp_type_quals (type
), r
);
12848 if (DECL_C_BIT_FIELD (r
))
12849 /* For bit-fields, DECL_BIT_FIELD_REPRESENTATIVE gives the
12851 DECL_BIT_FIELD_REPRESENTATIVE (r
)
12852 = tsubst_expr (DECL_BIT_FIELD_REPRESENTATIVE (t
), args
,
12854 /*integral_constant_expression_p=*/true);
12855 if (DECL_INITIAL (t
))
12857 /* Set up DECL_TEMPLATE_INFO so that we can get at the
12858 NSDMI in perform_member_init. Still set DECL_INITIAL
12859 so that we know there is one. */
12860 DECL_INITIAL (r
) = void_node
;
12861 gcc_assert (DECL_LANG_SPECIFIC (r
) == NULL
);
12862 retrofit_lang_decl (r
);
12863 DECL_TEMPLATE_INFO (r
) = build_template_info (t
, args
);
12865 /* We don't have to set DECL_CONTEXT here; it is set by
12866 finish_member_declaration. */
12867 DECL_CHAIN (r
) = NULL_TREE
;
12869 apply_late_template_attributes (&r
, DECL_ATTRIBUTES (r
), 0,
12870 args
, complain
, in_decl
);
12873 TREE_VEC_ELT (vec
, i
) = r
;
12879 tree pack
= make_node (NONTYPE_ARGUMENT_PACK
);
12880 SET_ARGUMENT_PACK_ARGS (pack
, vec
);
12881 register_specialization (pack
, t
, args
, false, 0);
12887 /* We reach here only for member using decls. We also need to check
12888 uses_template_parms because DECL_DEPENDENT_P is not set for a
12889 using-declaration that designates a member of the current
12890 instantiation (c++/53549). */
12891 if (DECL_DEPENDENT_P (t
)
12892 || uses_template_parms (USING_DECL_SCOPE (t
)))
12894 tree scope
= USING_DECL_SCOPE (t
);
12895 tree name
= tsubst_copy (DECL_NAME (t
), args
, complain
, in_decl
);
12896 if (PACK_EXPANSION_P (scope
))
12898 tree vec
= tsubst_pack_expansion (scope
, args
, complain
, in_decl
);
12899 int len
= TREE_VEC_LENGTH (vec
);
12900 r
= make_tree_vec (len
);
12901 for (int i
= 0; i
< len
; ++i
)
12903 tree escope
= TREE_VEC_ELT (vec
, i
);
12904 tree elt
= do_class_using_decl (escope
, name
);
12907 r
= error_mark_node
;
12912 TREE_PROTECTED (elt
) = TREE_PROTECTED (t
);
12913 TREE_PRIVATE (elt
) = TREE_PRIVATE (t
);
12915 TREE_VEC_ELT (r
, i
) = elt
;
12920 tree inst_scope
= tsubst_copy (USING_DECL_SCOPE (t
), args
,
12921 complain
, in_decl
);
12922 r
= do_class_using_decl (inst_scope
, name
);
12924 r
= error_mark_node
;
12927 TREE_PROTECTED (r
) = TREE_PROTECTED (t
);
12928 TREE_PRIVATE (r
) = TREE_PRIVATE (t
);
12935 DECL_CHAIN (r
) = NULL_TREE
;
12942 tree argvec
= NULL_TREE
;
12943 tree gen_tmpl
= NULL_TREE
;
12945 tree tmpl
= NULL_TREE
;
12947 tree type
= NULL_TREE
;
12950 if (TREE_TYPE (t
) == error_mark_node
)
12951 RETURN (error_mark_node
);
12953 if (TREE_CODE (t
) == TYPE_DECL
12954 && t
== TYPE_MAIN_DECL (TREE_TYPE (t
)))
12956 /* If this is the canonical decl, we don't have to
12957 mess with instantiations, and often we can't (for
12958 typename, template type parms and such). Note that
12959 TYPE_NAME is not correct for the above test if
12960 we've copied the type for a typedef. */
12961 type
= tsubst (TREE_TYPE (t
), args
, complain
, in_decl
);
12962 if (type
== error_mark_node
)
12963 RETURN (error_mark_node
);
12964 r
= TYPE_NAME (type
);
12968 /* Check to see if we already have the specialization we
12971 if (DECL_CLASS_SCOPE_P (t
) || DECL_NAMESPACE_SCOPE_P (t
))
12973 /* T is a static data member or namespace-scope entity.
12974 We have to substitute into namespace-scope variables
12975 (not just variable templates) because of cases like:
12977 template <class T> void f() { extern T t; }
12979 where the entity referenced is not known until
12980 instantiation time. */
12982 ctx
= DECL_CONTEXT (t
);
12983 if (DECL_CLASS_SCOPE_P (t
))
12985 ctx
= tsubst_aggr_type (ctx
, args
,
12987 in_decl
, /*entering_scope=*/1);
12988 /* If CTX is unchanged, then T is in fact the
12989 specialization we want. That situation occurs when
12990 referencing a static data member within in its own
12991 class. We can use pointer equality, rather than
12992 same_type_p, because DECL_CONTEXT is always
12994 if (ctx
== DECL_CONTEXT (t
)
12995 /* ... unless T is a member template; in which
12996 case our caller can be willing to create a
12997 specialization of that template represented
12999 && !(DECL_TI_TEMPLATE (t
)
13000 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (t
))))
13006 tmpl
= DECL_TI_TEMPLATE (t
);
13007 gen_tmpl
= most_general_template (tmpl
);
13008 argvec
= tsubst (DECL_TI_ARGS (t
), args
, complain
, in_decl
);
13009 if (argvec
!= error_mark_node
)
13010 argvec
= (coerce_innermost_template_parms
13011 (DECL_TEMPLATE_PARMS (gen_tmpl
),
13012 argvec
, t
, complain
,
13013 /*all*/true, /*defarg*/true));
13014 if (argvec
== error_mark_node
)
13015 RETURN (error_mark_node
);
13016 hash
= hash_tmpl_and_args (gen_tmpl
, argvec
);
13017 spec
= retrieve_specialization (gen_tmpl
, argvec
, hash
);
13022 /* A local variable. */
13024 /* Subsequent calls to pushdecl will fill this in. */
13026 /* Unless this is a reference to a static variable from an
13027 enclosing function, in which case we need to fill it in now. */
13028 if (TREE_STATIC (t
))
13030 tree fn
= enclosing_instantiation_of (DECL_CONTEXT (t
));
13031 if (fn
!= current_function_decl
)
13034 spec
= retrieve_local_specialization (t
);
13036 /* If we already have the specialization we need, there is
13037 nothing more to do. */
13044 /* Create a new node for the specialization we need. */
13046 if (type
== NULL_TREE
)
13048 if (is_typedef_decl (t
))
13049 type
= DECL_ORIGINAL_TYPE (t
);
13051 type
= TREE_TYPE (t
);
13053 && VAR_HAD_UNKNOWN_BOUND (t
)
13054 && type
!= error_mark_node
)
13055 type
= strip_array_domain (type
);
13056 tree sub_args
= args
;
13057 if (tree auto_node
= type_uses_auto (type
))
13059 /* Mask off any template args past the variable's context so we
13060 don't replace the auto with an unrelated argument. */
13061 int nouter
= TEMPLATE_TYPE_LEVEL (auto_node
) - 1;
13062 int extra
= TMPL_ARGS_DEPTH (args
) - nouter
;
13064 /* This should never happen with the new lambda instantiation
13065 model, but keep the handling just in case. */
13066 gcc_assert (!CHECKING_P
),
13067 sub_args
= strip_innermost_template_args (args
, extra
);
13069 type
= tsubst (type
, sub_args
, complain
, in_decl
);
13073 /* Even if the original location is out of scope, the
13074 newly substituted one is not. */
13075 DECL_DEAD_FOR_LOCAL (r
) = 0;
13076 DECL_INITIALIZED_P (r
) = 0;
13077 DECL_TEMPLATE_INSTANTIATED (r
) = 0;
13078 if (type
== error_mark_node
)
13079 RETURN (error_mark_node
);
13080 if (TREE_CODE (type
) == FUNCTION_TYPE
)
13082 /* It may seem that this case cannot occur, since:
13087 declares a function, not a variable. However:
13090 template <typename T> void g() { T t; }
13091 template void g<f>();
13093 is an attempt to declare a variable with function
13095 error ("variable %qD has function type",
13096 /* R is not yet sufficiently initialized, so we
13097 just use its name. */
13099 RETURN (error_mark_node
);
13101 type
= complete_type (type
);
13102 /* Wait until cp_finish_decl to set this again, to handle
13103 circular dependency (template/instantiate6.C). */
13104 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (r
) = 0;
13105 type
= check_var_type (DECL_NAME (r
), type
);
13107 if (DECL_HAS_VALUE_EXPR_P (t
))
13109 tree ve
= DECL_VALUE_EXPR (t
);
13110 ve
= tsubst_expr (ve
, args
, complain
, in_decl
,
13111 /*constant_expression_p=*/false);
13112 if (REFERENCE_REF_P (ve
))
13114 gcc_assert (TREE_CODE (type
) == REFERENCE_TYPE
);
13115 ve
= TREE_OPERAND (ve
, 0);
13117 SET_DECL_VALUE_EXPR (r
, ve
);
13119 if (CP_DECL_THREAD_LOCAL_P (r
)
13120 && !processing_template_decl
)
13121 set_decl_tls_model (r
, decl_default_tls_model (r
));
13123 else if (DECL_SELF_REFERENCE_P (t
))
13124 SET_DECL_SELF_REFERENCE_P (r
);
13125 TREE_TYPE (r
) = type
;
13126 cp_apply_type_quals_to_decl (cp_type_quals (type
), r
);
13127 DECL_CONTEXT (r
) = ctx
;
13128 /* Clear out the mangled name and RTL for the instantiation. */
13129 SET_DECL_ASSEMBLER_NAME (r
, NULL_TREE
);
13130 if (CODE_CONTAINS_STRUCT (TREE_CODE (t
), TS_DECL_WRTL
))
13131 SET_DECL_RTL (r
, NULL
);
13132 /* The initializer must not be expanded until it is required;
13133 see [temp.inst]. */
13134 DECL_INITIAL (r
) = NULL_TREE
;
13135 DECL_SIZE (r
) = DECL_SIZE_UNIT (r
) = 0;
13138 SET_DECL_MODE (r
, VOIDmode
);
13140 /* Possibly limit visibility based on template args. */
13141 DECL_VISIBILITY (r
) = VISIBILITY_DEFAULT
;
13142 if (DECL_VISIBILITY_SPECIFIED (t
))
13144 DECL_VISIBILITY_SPECIFIED (r
) = 0;
13145 DECL_ATTRIBUTES (r
)
13146 = remove_attribute ("visibility", DECL_ATTRIBUTES (r
));
13148 determine_visibility (r
);
13153 /* A static data member declaration is always marked
13154 external when it is declared in-class, even if an
13155 initializer is present. We mimic the non-template
13156 processing here. */
13157 DECL_EXTERNAL (r
) = 1;
13158 if (DECL_NAMESPACE_SCOPE_P (t
))
13159 DECL_NOT_REALLY_EXTERN (r
) = 1;
13161 DECL_TEMPLATE_INFO (r
) = build_template_info (tmpl
, argvec
);
13162 SET_DECL_IMPLICIT_INSTANTIATION (r
);
13163 register_specialization (r
, gen_tmpl
, argvec
, false, hash
);
13167 if (DECL_LANG_SPECIFIC (r
))
13168 DECL_TEMPLATE_INFO (r
) = NULL_TREE
;
13169 if (!cp_unevaluated_operand
)
13170 register_local_specialization (r
, t
);
13173 DECL_CHAIN (r
) = NULL_TREE
;
13175 apply_late_template_attributes (&r
, DECL_ATTRIBUTES (r
),
13177 args
, complain
, in_decl
);
13179 /* Preserve a typedef that names a type. */
13180 if (is_typedef_decl (r
) && type
!= error_mark_node
)
13182 DECL_ORIGINAL_TYPE (r
) = NULL_TREE
;
13183 set_underlying_type (r
);
13184 if (TYPE_DECL_ALIAS_P (r
))
13185 /* An alias template specialization can be dependent
13186 even if its underlying type is not. */
13187 TYPE_DEPENDENT_P_VALID (TREE_TYPE (r
)) = false;
13190 layout_decl (r
, 0);
13195 gcc_unreachable ();
13200 /* Restore the file and line information. */
13201 input_location
= saved_loc
;
13206 /* Substitute into the ARG_TYPES of a function type.
13207 If END is a TREE_CHAIN, leave it and any following types
13211 tsubst_arg_types (tree arg_types
,
13214 tsubst_flags_t complain
,
13217 tree remaining_arg_types
;
13218 tree type
= NULL_TREE
;
13220 tree expanded_args
= NULL_TREE
;
13223 if (!arg_types
|| arg_types
== void_list_node
|| arg_types
== end
)
13226 remaining_arg_types
= tsubst_arg_types (TREE_CHAIN (arg_types
),
13227 args
, end
, complain
, in_decl
);
13228 if (remaining_arg_types
== error_mark_node
)
13229 return error_mark_node
;
13231 if (PACK_EXPANSION_P (TREE_VALUE (arg_types
)))
13233 /* For a pack expansion, perform substitution on the
13234 entire expression. Later on, we'll handle the arguments
13236 expanded_args
= tsubst_pack_expansion (TREE_VALUE (arg_types
),
13237 args
, complain
, in_decl
);
13239 if (TREE_CODE (expanded_args
) == TREE_VEC
)
13240 /* So that we'll spin through the parameters, one by one. */
13241 i
= TREE_VEC_LENGTH (expanded_args
);
13244 /* We only partially substituted into the parameter
13245 pack. Our type is TYPE_PACK_EXPANSION. */
13246 type
= expanded_args
;
13247 expanded_args
= NULL_TREE
;
13255 type
= TREE_VEC_ELT (expanded_args
, i
);
13257 type
= tsubst (TREE_VALUE (arg_types
), args
, complain
, in_decl
);
13259 if (type
== error_mark_node
)
13260 return error_mark_node
;
13261 if (VOID_TYPE_P (type
))
13263 if (complain
& tf_error
)
13265 error ("invalid parameter type %qT", type
);
13267 error ("in declaration %q+D", in_decl
);
13269 return error_mark_node
;
13272 if (abstract_virtuals_error_sfinae (ACU_PARM
, type
, complain
))
13273 return error_mark_node
;
13275 /* Do array-to-pointer, function-to-pointer conversion, and ignore
13276 top-level qualifiers as required. */
13277 type
= cv_unqualified (type_decays_to (type
));
13279 /* We do not substitute into default arguments here. The standard
13280 mandates that they be instantiated only when needed, which is
13281 done in build_over_call. */
13282 default_arg
= TREE_PURPOSE (arg_types
);
13284 /* Except that we do substitute default arguments under tsubst_lambda_expr,
13285 since the new op() won't have any associated template arguments for us
13286 to refer to later. */
13287 if (lambda_fn_in_template_p (in_decl
))
13288 default_arg
= tsubst_copy_and_build (default_arg
, args
, complain
, in_decl
,
13289 false/*fn*/, false/*constexpr*/);
13291 if (default_arg
&& TREE_CODE (default_arg
) == DEFAULT_ARG
)
13293 /* We've instantiated a template before its default arguments
13294 have been parsed. This can happen for a nested template
13295 class, and is not an error unless we require the default
13296 argument in a call of this function. */
13297 remaining_arg_types
=
13298 tree_cons (default_arg
, type
, remaining_arg_types
);
13299 vec_safe_push (DEFARG_INSTANTIATIONS(default_arg
), remaining_arg_types
);
13302 remaining_arg_types
=
13303 hash_tree_cons (default_arg
, type
, remaining_arg_types
);
13306 return remaining_arg_types
;
13309 /* Substitute into a FUNCTION_TYPE or METHOD_TYPE. This routine does
13310 *not* handle the exception-specification for FNTYPE, because the
13311 initial substitution of explicitly provided template parameters
13312 during argument deduction forbids substitution into the
13313 exception-specification:
13317 All references in the function type of the function template to the
13318 corresponding template parameters are replaced by the specified tem-
13319 plate argument values. If a substitution in a template parameter or
13320 in the function type of the function template results in an invalid
13321 type, type deduction fails. [Note: The equivalent substitution in
13322 exception specifications is done only when the function is instanti-
13323 ated, at which point a program is ill-formed if the substitution
13324 results in an invalid type.] */
13327 tsubst_function_type (tree t
,
13329 tsubst_flags_t complain
,
13333 tree arg_types
= NULL_TREE
;
13336 /* The TYPE_CONTEXT is not used for function/method types. */
13337 gcc_assert (TYPE_CONTEXT (t
) == NULL_TREE
);
13339 /* DR 1227: Mixing immediate and non-immediate contexts in deduction
13341 bool late_return_type_p
= TYPE_HAS_LATE_RETURN_TYPE (t
);
13343 if (late_return_type_p
)
13345 /* Substitute the argument types. */
13346 arg_types
= tsubst_arg_types (TYPE_ARG_TYPES (t
), args
, NULL_TREE
,
13347 complain
, in_decl
);
13348 if (arg_types
== error_mark_node
)
13349 return error_mark_node
;
13351 tree save_ccp
= current_class_ptr
;
13352 tree save_ccr
= current_class_ref
;
13353 tree this_type
= (TREE_CODE (t
) == METHOD_TYPE
13354 ? TREE_TYPE (TREE_VALUE (arg_types
)) : NULL_TREE
);
13355 bool do_inject
= this_type
&& CLASS_TYPE_P (this_type
);
13358 /* DR 1207: 'this' is in scope in the trailing return type. */
13359 inject_this_parameter (this_type
, cp_type_quals (this_type
));
13362 /* Substitute the return type. */
13363 return_type
= tsubst (TREE_TYPE (t
), args
, complain
, in_decl
);
13367 current_class_ptr
= save_ccp
;
13368 current_class_ref
= save_ccr
;
13372 /* Substitute the return type. */
13373 return_type
= tsubst (TREE_TYPE (t
), args
, complain
, in_decl
);
13375 if (return_type
== error_mark_node
)
13376 return error_mark_node
;
13377 /* DR 486 clarifies that creation of a function type with an
13378 invalid return type is a deduction failure. */
13379 if (TREE_CODE (return_type
) == ARRAY_TYPE
13380 || TREE_CODE (return_type
) == FUNCTION_TYPE
)
13382 if (complain
& tf_error
)
13384 if (TREE_CODE (return_type
) == ARRAY_TYPE
)
13385 error ("function returning an array");
13387 error ("function returning a function");
13389 return error_mark_node
;
13392 if (abstract_virtuals_error_sfinae (ACU_RETURN
, return_type
, complain
))
13393 return error_mark_node
;
13395 if (!late_return_type_p
)
13397 /* Substitute the argument types. */
13398 arg_types
= tsubst_arg_types (TYPE_ARG_TYPES (t
), args
, NULL_TREE
,
13399 complain
, in_decl
);
13400 if (arg_types
== error_mark_node
)
13401 return error_mark_node
;
13404 /* Construct a new type node and return it. */
13405 if (TREE_CODE (t
) == FUNCTION_TYPE
)
13407 fntype
= build_function_type (return_type
, arg_types
);
13408 fntype
= apply_memfn_quals (fntype
,
13409 type_memfn_quals (t
),
13410 type_memfn_rqual (t
));
13414 tree r
= TREE_TYPE (TREE_VALUE (arg_types
));
13415 /* Don't pick up extra function qualifiers from the basetype. */
13416 r
= cp_build_qualified_type_real (r
, type_memfn_quals (t
), complain
);
13417 if (! MAYBE_CLASS_TYPE_P (r
))
13421 Type deduction may fail for any of the following
13424 -- Attempting to create "pointer to member of T" when T
13425 is not a class type. */
13426 if (complain
& tf_error
)
13427 error ("creating pointer to member function of non-class type %qT",
13429 return error_mark_node
;
13432 fntype
= build_method_type_directly (r
, return_type
,
13433 TREE_CHAIN (arg_types
));
13434 fntype
= build_ref_qualified_type (fntype
, type_memfn_rqual (t
));
13436 fntype
= cp_build_type_attribute_variant (fntype
, TYPE_ATTRIBUTES (t
));
13438 if (late_return_type_p
)
13439 TYPE_HAS_LATE_RETURN_TYPE (fntype
) = 1;
13444 /* FNTYPE is a FUNCTION_TYPE or METHOD_TYPE. Substitute the template
13445 ARGS into that specification, and return the substituted
13446 specification. If there is no specification, return NULL_TREE. */
13449 tsubst_exception_specification (tree fntype
,
13451 tsubst_flags_t complain
,
13458 specs
= TYPE_RAISES_EXCEPTIONS (fntype
);
13459 new_specs
= NULL_TREE
;
13460 if (specs
&& TREE_PURPOSE (specs
))
13462 /* A noexcept-specifier. */
13463 tree expr
= TREE_PURPOSE (specs
);
13464 if (TREE_CODE (expr
) == INTEGER_CST
)
13468 /* Defer instantiation of noexcept-specifiers to avoid
13469 excessive instantiations (c++/49107). */
13470 new_specs
= make_node (DEFERRED_NOEXCEPT
);
13471 if (DEFERRED_NOEXCEPT_SPEC_P (specs
))
13473 /* We already partially instantiated this member template,
13474 so combine the new args with the old. */
13475 DEFERRED_NOEXCEPT_PATTERN (new_specs
)
13476 = DEFERRED_NOEXCEPT_PATTERN (expr
);
13477 DEFERRED_NOEXCEPT_ARGS (new_specs
)
13478 = add_to_template_args (DEFERRED_NOEXCEPT_ARGS (expr
), args
);
13482 DEFERRED_NOEXCEPT_PATTERN (new_specs
) = expr
;
13483 DEFERRED_NOEXCEPT_ARGS (new_specs
) = args
;
13487 new_specs
= tsubst_copy_and_build
13488 (expr
, args
, complain
, in_decl
, /*function_p=*/false,
13489 /*integral_constant_expression_p=*/true);
13490 new_specs
= build_noexcept_spec (new_specs
, complain
);
13494 if (! TREE_VALUE (specs
))
13501 tree expanded_specs
= NULL_TREE
;
13503 if (PACK_EXPANSION_P (TREE_VALUE (specs
)))
13505 /* Expand the pack expansion type. */
13506 expanded_specs
= tsubst_pack_expansion (TREE_VALUE (specs
),
13510 if (expanded_specs
== error_mark_node
)
13511 return error_mark_node
;
13512 else if (TREE_CODE (expanded_specs
) == TREE_VEC
)
13513 len
= TREE_VEC_LENGTH (expanded_specs
);
13516 /* We're substituting into a member template, so
13517 we got a TYPE_PACK_EXPANSION back. Add that
13518 expansion and move on. */
13519 gcc_assert (TREE_CODE (expanded_specs
)
13520 == TYPE_PACK_EXPANSION
);
13521 new_specs
= add_exception_specifier (new_specs
,
13524 specs
= TREE_CHAIN (specs
);
13529 for (i
= 0; i
< len
; ++i
)
13531 if (expanded_specs
)
13532 spec
= TREE_VEC_ELT (expanded_specs
, i
);
13534 spec
= tsubst (TREE_VALUE (specs
), args
, complain
, in_decl
);
13535 if (spec
== error_mark_node
)
13537 new_specs
= add_exception_specifier (new_specs
, spec
,
13541 specs
= TREE_CHAIN (specs
);
13547 /* Take the tree structure T and replace template parameters used
13548 therein with the argument vector ARGS. IN_DECL is an associated
13549 decl for diagnostics. If an error occurs, returns ERROR_MARK_NODE.
13550 Issue error and warning messages under control of COMPLAIN. Note
13551 that we must be relatively non-tolerant of extensions here, in
13552 order to preserve conformance; if we allow substitutions that
13553 should not be allowed, we may allow argument deductions that should
13554 not succeed, and therefore report ambiguous overload situations
13555 where there are none. In theory, we could allow the substitution,
13556 but indicate that it should have failed, and allow our caller to
13557 make sure that the right thing happens, but we don't try to do this
13560 This function is used for dealing with types, decls and the like;
13561 for expressions, use tsubst_expr or tsubst_copy. */
13564 tsubst (tree t
, tree args
, tsubst_flags_t complain
, tree in_decl
)
13566 enum tree_code code
;
13567 tree type
, r
= NULL_TREE
;
13569 if (t
== NULL_TREE
|| t
== error_mark_node
13570 || t
== integer_type_node
13571 || t
== void_type_node
13572 || t
== char_type_node
13573 || t
== unknown_type_node
13574 || TREE_CODE (t
) == NAMESPACE_DECL
13575 || TREE_CODE (t
) == TRANSLATION_UNIT_DECL
)
13579 return tsubst_decl (t
, args
, complain
);
13581 if (args
== NULL_TREE
)
13584 code
= TREE_CODE (t
);
13586 if (code
== IDENTIFIER_NODE
)
13587 type
= IDENTIFIER_TYPE_VALUE (t
);
13589 type
= TREE_TYPE (t
);
13591 gcc_assert (type
!= unknown_type_node
);
13593 /* Reuse typedefs. We need to do this to handle dependent attributes,
13594 such as attribute aligned. */
13596 && typedef_variant_p (t
))
13598 tree decl
= TYPE_NAME (t
);
13600 if (alias_template_specialization_p (t
))
13602 /* DECL represents an alias template and we want to
13604 tree tmpl
= most_general_template (DECL_TI_TEMPLATE (decl
));
13605 tree gen_args
= tsubst (DECL_TI_ARGS (decl
), args
, complain
, in_decl
);
13606 r
= instantiate_alias_template (tmpl
, gen_args
, complain
);
13608 else if (DECL_CLASS_SCOPE_P (decl
)
13609 && CLASSTYPE_TEMPLATE_INFO (DECL_CONTEXT (decl
))
13610 && uses_template_parms (DECL_CONTEXT (decl
)))
13612 tree tmpl
= most_general_template (DECL_TI_TEMPLATE (decl
));
13613 tree gen_args
= tsubst (DECL_TI_ARGS (decl
), args
, complain
, in_decl
);
13614 r
= retrieve_specialization (tmpl
, gen_args
, 0);
13616 else if (DECL_FUNCTION_SCOPE_P (decl
)
13617 && DECL_TEMPLATE_INFO (DECL_CONTEXT (decl
))
13618 && uses_template_parms (DECL_TI_ARGS (DECL_CONTEXT (decl
))))
13619 r
= retrieve_local_specialization (decl
);
13621 /* The typedef is from a non-template context. */
13627 r
= cp_build_qualified_type_real
13628 (r
, cp_type_quals (t
) | cp_type_quals (r
),
13629 complain
| tf_ignore_bad_quals
);
13634 /* We don't have an instantiation yet, so drop the typedef. */
13635 int quals
= cp_type_quals (t
);
13636 t
= DECL_ORIGINAL_TYPE (decl
);
13637 t
= cp_build_qualified_type_real (t
, quals
,
13638 complain
| tf_ignore_bad_quals
);
13642 bool fndecl_type
= (complain
& tf_fndecl_type
);
13643 complain
&= ~tf_fndecl_type
;
13646 && code
!= TYPENAME_TYPE
13647 && code
!= TEMPLATE_TYPE_PARM
13648 && code
!= TEMPLATE_PARM_INDEX
13649 && code
!= IDENTIFIER_NODE
13650 && code
!= FUNCTION_TYPE
13651 && code
!= METHOD_TYPE
)
13652 type
= tsubst (type
, args
, complain
, in_decl
);
13653 if (type
== error_mark_node
)
13654 return error_mark_node
;
13660 case ENUMERAL_TYPE
:
13661 return tsubst_aggr_type (t
, args
, complain
, in_decl
,
13662 /*entering_scope=*/0);
13665 case IDENTIFIER_NODE
:
13676 if (t
== integer_type_node
)
13679 if (TREE_CODE (TYPE_MIN_VALUE (t
)) == INTEGER_CST
13680 && TREE_CODE (TYPE_MAX_VALUE (t
)) == INTEGER_CST
)
13684 tree max
, omax
= TREE_OPERAND (TYPE_MAX_VALUE (t
), 0);
13686 max
= tsubst_expr (omax
, args
, complain
, in_decl
,
13687 /*integral_constant_expression_p=*/false);
13689 /* Fix up type of the magic NOP_EXPR with TREE_SIDE_EFFECTS if
13691 if (TREE_CODE (max
) == NOP_EXPR
13692 && TREE_SIDE_EFFECTS (omax
)
13693 && !TREE_TYPE (max
))
13694 TREE_TYPE (max
) = TREE_TYPE (TREE_OPERAND (max
, 0));
13696 /* If we're in a partial instantiation, preserve the magic NOP_EXPR
13697 with TREE_SIDE_EFFECTS that indicates this is not an integral
13698 constant expression. */
13699 if (processing_template_decl
13700 && TREE_SIDE_EFFECTS (omax
) && TREE_CODE (omax
) == NOP_EXPR
)
13702 gcc_assert (TREE_CODE (max
) == NOP_EXPR
);
13703 TREE_SIDE_EFFECTS (max
) = 1;
13706 return compute_array_index_type (NULL_TREE
, max
, complain
);
13709 case TEMPLATE_TYPE_PARM
:
13710 case TEMPLATE_TEMPLATE_PARM
:
13711 case BOUND_TEMPLATE_TEMPLATE_PARM
:
13712 case TEMPLATE_PARM_INDEX
:
13717 tree arg
= NULL_TREE
;
13719 /* Early in template argument deduction substitution, we don't
13720 want to reduce the level of 'auto', or it will be confused
13721 with a normal template parm in subsequent deduction. */
13722 if (is_auto (t
) && (complain
& tf_partial
))
13727 gcc_assert (TREE_VEC_LENGTH (args
) > 0);
13728 template_parm_level_and_index (t
, &level
, &idx
);
13730 levels
= TMPL_ARGS_DEPTH (args
);
13731 if (level
<= levels
13732 && TREE_VEC_LENGTH (TMPL_ARGS_LEVEL (args
, level
)) > 0)
13734 arg
= TMPL_ARG (args
, level
, idx
);
13736 if (arg
&& TREE_CODE (arg
) == ARGUMENT_PACK_SELECT
)
13738 /* See through ARGUMENT_PACK_SELECT arguments. */
13739 arg
= ARGUMENT_PACK_SELECT_ARG (arg
);
13740 /* If the selected argument is an expansion E, that most
13741 likely means we were called from
13742 gen_elem_of_pack_expansion_instantiation during the
13743 substituting of pack an argument pack (which Ith
13744 element is a pack expansion, where I is
13745 ARGUMENT_PACK_SELECT_INDEX) into a pack expansion.
13746 In this case, the Ith element resulting from this
13747 substituting is going to be a pack expansion, which
13748 pattern is the pattern of E. Let's return the
13750 gen_elem_of_pack_expansion_instantiation will
13751 build the resulting pack expansion from it. */
13752 if (PACK_EXPANSION_P (arg
))
13754 /* Make sure we aren't throwing away arg info. */
13755 gcc_assert (!PACK_EXPANSION_EXTRA_ARGS (arg
));
13756 arg
= PACK_EXPANSION_PATTERN (arg
);
13761 if (arg
== error_mark_node
)
13762 return error_mark_node
;
13763 else if (arg
!= NULL_TREE
)
13765 if (ARGUMENT_PACK_P (arg
))
13766 /* If ARG is an argument pack, we don't actually want to
13767 perform a substitution here, because substitutions
13768 for argument packs are only done
13769 element-by-element. We can get to this point when
13770 substituting the type of a non-type template
13771 parameter pack, when that type actually contains
13772 template parameter packs from an outer template, e.g.,
13774 template<typename... Types> struct A {
13775 template<Types... Values> struct B { };
13779 if (code
== TEMPLATE_TYPE_PARM
)
13782 gcc_assert (TYPE_P (arg
));
13784 quals
= cp_type_quals (arg
) | cp_type_quals (t
);
13786 return cp_build_qualified_type_real
13787 (arg
, quals
, complain
| tf_ignore_bad_quals
);
13789 else if (code
== BOUND_TEMPLATE_TEMPLATE_PARM
)
13791 /* We are processing a type constructed from a
13792 template template parameter. */
13793 tree argvec
= tsubst (TYPE_TI_ARGS (t
),
13794 args
, complain
, in_decl
);
13795 if (argvec
== error_mark_node
)
13796 return error_mark_node
;
13798 gcc_assert (TREE_CODE (arg
) == TEMPLATE_TEMPLATE_PARM
13799 || TREE_CODE (arg
) == TEMPLATE_DECL
13800 || TREE_CODE (arg
) == UNBOUND_CLASS_TEMPLATE
);
13802 if (TREE_CODE (arg
) == UNBOUND_CLASS_TEMPLATE
)
13803 /* Consider this code:
13805 template <template <class> class Template>
13807 template <class Arg> using Bind = Template<Arg>;
13810 template <template <class> class Template, class Arg>
13811 using Instantiate = Template<Arg>; //#0
13813 template <template <class> class Template,
13816 Instantiate<Internal<Template>::template Bind,
13819 When #1 is parsed, the
13820 BOUND_TEMPLATE_TEMPLATE_PARM representing the
13821 parameter `Template' in #0 matches the
13822 UNBOUND_CLASS_TEMPLATE representing the argument
13823 `Internal<Template>::template Bind'; We then want
13824 to assemble the type `Bind<Argument>' that can't
13825 be fully created right now, because
13826 `Internal<Template>' not being complete, the Bind
13827 template cannot be looked up in that context. So
13828 we need to "store" `Bind<Argument>' for later
13829 when the context of Bind becomes complete. Let's
13830 store that in a TYPENAME_TYPE. */
13831 return make_typename_type (TYPE_CONTEXT (arg
),
13832 build_nt (TEMPLATE_ID_EXPR
,
13833 TYPE_IDENTIFIER (arg
),
13838 /* We can get a TEMPLATE_TEMPLATE_PARM here when we
13839 are resolving nested-types in the signature of a
13840 member function templates. Otherwise ARG is a
13841 TEMPLATE_DECL and is the real template to be
13843 if (TREE_CODE (arg
) == TEMPLATE_TEMPLATE_PARM
)
13844 arg
= TYPE_NAME (arg
);
13846 r
= lookup_template_class (arg
,
13848 DECL_CONTEXT (arg
),
13849 /*entering_scope=*/0,
13851 return cp_build_qualified_type_real
13852 (r
, cp_type_quals (t
) | cp_type_quals (r
), complain
);
13854 else if (code
== TEMPLATE_TEMPLATE_PARM
)
13857 /* TEMPLATE_PARM_INDEX. */
13858 return convert_from_reference (unshare_expr (arg
));
13862 /* This can happen during the attempted tsubst'ing in
13863 unify. This means that we don't yet have any information
13864 about the template parameter in question. */
13867 /* If we get here, we must have been looking at a parm for a
13868 more deeply nested template. Make a new version of this
13869 template parameter, but with a lower level. */
13872 case TEMPLATE_TYPE_PARM
:
13873 case TEMPLATE_TEMPLATE_PARM
:
13874 case BOUND_TEMPLATE_TEMPLATE_PARM
:
13875 if (cp_type_quals (t
))
13877 r
= tsubst (TYPE_MAIN_VARIANT (t
), args
, complain
, in_decl
);
13878 r
= cp_build_qualified_type_real
13879 (r
, cp_type_quals (t
),
13880 complain
| (code
== TEMPLATE_TYPE_PARM
13881 ? tf_ignore_bad_quals
: 0));
13883 else if (TREE_CODE (t
) == TEMPLATE_TYPE_PARM
13884 && PLACEHOLDER_TYPE_CONSTRAINTS (t
)
13885 && (r
= (TEMPLATE_PARM_DESCENDANTS
13886 (TEMPLATE_TYPE_PARM_INDEX (t
))))
13887 && (r
= TREE_TYPE (r
))
13888 && !PLACEHOLDER_TYPE_CONSTRAINTS (r
))
13889 /* Break infinite recursion when substituting the constraints
13890 of a constrained placeholder. */;
13894 TEMPLATE_TYPE_PARM_INDEX (r
)
13895 = reduce_template_parm_level (TEMPLATE_TYPE_PARM_INDEX (t
),
13896 r
, levels
, args
, complain
);
13897 TYPE_STUB_DECL (r
) = TYPE_NAME (r
) = TEMPLATE_TYPE_DECL (r
);
13898 TYPE_MAIN_VARIANT (r
) = r
;
13899 TYPE_POINTER_TO (r
) = NULL_TREE
;
13900 TYPE_REFERENCE_TO (r
) = NULL_TREE
;
13902 if (TREE_CODE (t
) == TEMPLATE_TYPE_PARM
)
13904 /* Propagate constraints on placeholders. */
13905 if (tree constr
= PLACEHOLDER_TYPE_CONSTRAINTS (t
))
13906 PLACEHOLDER_TYPE_CONSTRAINTS (r
)
13907 = tsubst_constraint (constr
, args
, complain
, in_decl
);
13908 else if (tree pl
= CLASS_PLACEHOLDER_TEMPLATE (t
))
13910 if (DECL_TEMPLATE_TEMPLATE_PARM_P (pl
))
13911 pl
= tsubst (pl
, args
, complain
, in_decl
);
13912 CLASS_PLACEHOLDER_TEMPLATE (r
) = pl
;
13916 if (TREE_CODE (r
) == TEMPLATE_TEMPLATE_PARM
)
13917 /* We have reduced the level of the template
13918 template parameter, but not the levels of its
13919 template parameters, so canonical_type_parameter
13920 will not be able to find the canonical template
13921 template parameter for this level. Thus, we
13922 require structural equality checking to compare
13923 TEMPLATE_TEMPLATE_PARMs. */
13924 SET_TYPE_STRUCTURAL_EQUALITY (r
);
13925 else if (TYPE_STRUCTURAL_EQUALITY_P (t
))
13926 SET_TYPE_STRUCTURAL_EQUALITY (r
);
13928 TYPE_CANONICAL (r
) = canonical_type_parameter (r
);
13930 if (code
== BOUND_TEMPLATE_TEMPLATE_PARM
)
13932 tree tinfo
= TYPE_TEMPLATE_INFO (t
);
13933 /* We might need to substitute into the types of non-type
13934 template parameters. */
13935 tree tmpl
= tsubst (TI_TEMPLATE (tinfo
), args
,
13936 complain
, in_decl
);
13937 if (tmpl
== error_mark_node
)
13938 return error_mark_node
;
13939 tree argvec
= tsubst (TI_ARGS (tinfo
), args
,
13940 complain
, in_decl
);
13941 if (argvec
== error_mark_node
)
13942 return error_mark_node
;
13944 TEMPLATE_TEMPLATE_PARM_TEMPLATE_INFO (r
)
13945 = build_template_info (tmpl
, argvec
);
13950 case TEMPLATE_PARM_INDEX
:
13951 /* OK, now substitute the type of the non-type parameter. We
13952 couldn't do it earlier because it might be an auto parameter,
13953 and we wouldn't need to if we had an argument. */
13954 type
= tsubst (type
, args
, complain
, in_decl
);
13955 if (type
== error_mark_node
)
13956 return error_mark_node
;
13957 r
= reduce_template_parm_level (t
, type
, levels
, args
, complain
);
13961 gcc_unreachable ();
13969 tree purpose
, value
, chain
;
13971 if (t
== void_list_node
)
13974 purpose
= TREE_PURPOSE (t
);
13977 purpose
= tsubst (purpose
, args
, complain
, in_decl
);
13978 if (purpose
== error_mark_node
)
13979 return error_mark_node
;
13981 value
= TREE_VALUE (t
);
13984 value
= tsubst (value
, args
, complain
, in_decl
);
13985 if (value
== error_mark_node
)
13986 return error_mark_node
;
13988 chain
= TREE_CHAIN (t
);
13989 if (chain
&& chain
!= void_type_node
)
13991 chain
= tsubst (chain
, args
, complain
, in_decl
);
13992 if (chain
== error_mark_node
)
13993 return error_mark_node
;
13995 if (purpose
== TREE_PURPOSE (t
)
13996 && value
== TREE_VALUE (t
)
13997 && chain
== TREE_CHAIN (t
))
13999 return hash_tree_cons (purpose
, value
, chain
);
14003 /* We should never be tsubsting a binfo. */
14004 gcc_unreachable ();
14007 /* A vector of template arguments. */
14008 gcc_assert (!type
);
14009 return tsubst_template_args (t
, args
, complain
, in_decl
);
14012 case REFERENCE_TYPE
:
14014 if (type
== TREE_TYPE (t
) && TREE_CODE (type
) != METHOD_TYPE
)
14019 Type deduction may fail for any of the following
14022 -- Attempting to create a pointer to reference type.
14023 -- Attempting to create a reference to a reference type or
14024 a reference to void.
14026 Core issue 106 says that creating a reference to a reference
14027 during instantiation is no longer a cause for failure. We
14028 only enforce this check in strict C++98 mode. */
14029 if ((TREE_CODE (type
) == REFERENCE_TYPE
14030 && (((cxx_dialect
== cxx98
) && flag_iso
) || code
!= REFERENCE_TYPE
))
14031 || (code
== REFERENCE_TYPE
&& VOID_TYPE_P (type
)))
14033 static location_t last_loc
;
14035 /* We keep track of the last time we issued this error
14036 message to avoid spewing a ton of messages during a
14037 single bad template instantiation. */
14038 if (complain
& tf_error
14039 && last_loc
!= input_location
)
14041 if (VOID_TYPE_P (type
))
14042 error ("forming reference to void");
14043 else if (code
== POINTER_TYPE
)
14044 error ("forming pointer to reference type %qT", type
);
14046 error ("forming reference to reference type %qT", type
);
14047 last_loc
= input_location
;
14050 return error_mark_node
;
14052 else if (TREE_CODE (type
) == FUNCTION_TYPE
14053 && (type_memfn_quals (type
) != TYPE_UNQUALIFIED
14054 || type_memfn_rqual (type
) != REF_QUAL_NONE
))
14056 if (complain
& tf_error
)
14058 if (code
== POINTER_TYPE
)
14059 error ("forming pointer to qualified function type %qT",
14062 error ("forming reference to qualified function type %qT",
14065 return error_mark_node
;
14067 else if (code
== POINTER_TYPE
)
14069 r
= build_pointer_type (type
);
14070 if (TREE_CODE (type
) == METHOD_TYPE
)
14071 r
= build_ptrmemfunc_type (r
);
14073 else if (TREE_CODE (type
) == REFERENCE_TYPE
)
14074 /* In C++0x, during template argument substitution, when there is an
14075 attempt to create a reference to a reference type, reference
14076 collapsing is applied as described in [14.3.1/4 temp.arg.type]:
14078 "If a template-argument for a template-parameter T names a type
14079 that is a reference to a type A, an attempt to create the type
14080 'lvalue reference to cv T' creates the type 'lvalue reference to
14081 A,' while an attempt to create the type type rvalue reference to
14082 cv T' creates the type T"
14084 r
= cp_build_reference_type
14086 TYPE_REF_IS_RVALUE (t
) && TYPE_REF_IS_RVALUE (type
));
14088 r
= cp_build_reference_type (type
, TYPE_REF_IS_RVALUE (t
));
14089 r
= cp_build_qualified_type_real (r
, cp_type_quals (t
), complain
);
14091 if (r
!= error_mark_node
)
14092 /* Will this ever be needed for TYPE_..._TO values? */
14099 r
= tsubst (TYPE_OFFSET_BASETYPE (t
), args
, complain
, in_decl
);
14100 if (r
== error_mark_node
|| !MAYBE_CLASS_TYPE_P (r
))
14104 Type deduction may fail for any of the following
14107 -- Attempting to create "pointer to member of T" when T
14108 is not a class type. */
14109 if (complain
& tf_error
)
14110 error ("creating pointer to member of non-class type %qT", r
);
14111 return error_mark_node
;
14113 if (TREE_CODE (type
) == REFERENCE_TYPE
)
14115 if (complain
& tf_error
)
14116 error ("creating pointer to member reference type %qT", type
);
14117 return error_mark_node
;
14119 if (VOID_TYPE_P (type
))
14121 if (complain
& tf_error
)
14122 error ("creating pointer to member of type void");
14123 return error_mark_node
;
14125 gcc_assert (TREE_CODE (type
) != METHOD_TYPE
);
14126 if (TREE_CODE (type
) == FUNCTION_TYPE
)
14128 /* The type of the implicit object parameter gets its
14129 cv-qualifiers from the FUNCTION_TYPE. */
14132 = build_memfn_type (type
, r
, type_memfn_quals (type
),
14133 type_memfn_rqual (type
));
14134 memptr
= build_ptrmemfunc_type (build_pointer_type (method_type
));
14135 return cp_build_qualified_type_real (memptr
, cp_type_quals (t
),
14139 return cp_build_qualified_type_real (build_ptrmem_type (r
, type
),
14143 case FUNCTION_TYPE
:
14148 fntype
= tsubst_function_type (t
, args
, complain
, in_decl
);
14149 if (fntype
== error_mark_node
)
14150 return error_mark_node
;
14152 /* Substitute the exception specification. */
14153 specs
= tsubst_exception_specification (t
, args
, complain
, in_decl
,
14154 /*defer_ok*/fndecl_type
);
14155 if (specs
== error_mark_node
)
14156 return error_mark_node
;
14158 fntype
= build_exception_variant (fntype
, specs
);
14163 tree domain
= tsubst (TYPE_DOMAIN (t
), args
, complain
, in_decl
);
14164 if (domain
== error_mark_node
)
14165 return error_mark_node
;
14167 /* As an optimization, we avoid regenerating the array type if
14168 it will obviously be the same as T. */
14169 if (type
== TREE_TYPE (t
) && domain
== TYPE_DOMAIN (t
))
14172 /* These checks should match the ones in create_array_type_for_decl.
14176 The deduction may fail for any of the following reasons:
14178 -- Attempting to create an array with an element type that
14179 is void, a function type, or a reference type, or [DR337]
14180 an abstract class type. */
14181 if (VOID_TYPE_P (type
)
14182 || TREE_CODE (type
) == FUNCTION_TYPE
14183 || (TREE_CODE (type
) == ARRAY_TYPE
14184 && TYPE_DOMAIN (type
) == NULL_TREE
)
14185 || TREE_CODE (type
) == REFERENCE_TYPE
)
14187 if (complain
& tf_error
)
14188 error ("creating array of %qT", type
);
14189 return error_mark_node
;
14192 if (abstract_virtuals_error_sfinae (ACU_ARRAY
, type
, complain
))
14193 return error_mark_node
;
14195 r
= build_cplus_array_type (type
, domain
);
14197 if (TYPE_USER_ALIGN (t
))
14199 SET_TYPE_ALIGN (r
, TYPE_ALIGN (t
));
14200 TYPE_USER_ALIGN (r
) = 1;
14206 case TYPENAME_TYPE
:
14208 tree ctx
= tsubst_aggr_type (TYPE_CONTEXT (t
), args
, complain
,
14209 in_decl
, /*entering_scope=*/1);
14210 if (ctx
== error_mark_node
)
14211 return error_mark_node
;
14213 tree f
= tsubst_copy (TYPENAME_TYPE_FULLNAME (t
), args
,
14214 complain
, in_decl
);
14215 if (f
== error_mark_node
)
14216 return error_mark_node
;
14218 if (!MAYBE_CLASS_TYPE_P (ctx
))
14220 if (complain
& tf_error
)
14221 error ("%qT is not a class, struct, or union type", ctx
);
14222 return error_mark_node
;
14224 else if (!uses_template_parms (ctx
) && !TYPE_BEING_DEFINED (ctx
))
14226 /* Normally, make_typename_type does not require that the CTX
14227 have complete type in order to allow things like:
14229 template <class T> struct S { typename S<T>::X Y; };
14231 But, such constructs have already been resolved by this
14232 point, so here CTX really should have complete type, unless
14233 it's a partial instantiation. */
14234 ctx
= complete_type (ctx
);
14235 if (!COMPLETE_TYPE_P (ctx
))
14237 if (complain
& tf_error
)
14238 cxx_incomplete_type_error (NULL_TREE
, ctx
);
14239 return error_mark_node
;
14243 f
= make_typename_type (ctx
, f
, typename_type
,
14244 complain
| tf_keep_type_decl
);
14245 if (f
== error_mark_node
)
14247 if (TREE_CODE (f
) == TYPE_DECL
)
14249 complain
|= tf_ignore_bad_quals
;
14253 if (TREE_CODE (f
) != TYPENAME_TYPE
)
14255 if (TYPENAME_IS_ENUM_P (t
) && TREE_CODE (f
) != ENUMERAL_TYPE
)
14257 if (complain
& tf_error
)
14258 error ("%qT resolves to %qT, which is not an enumeration type",
14261 return error_mark_node
;
14263 else if (TYPENAME_IS_CLASS_P (t
) && !CLASS_TYPE_P (f
))
14265 if (complain
& tf_error
)
14266 error ("%qT resolves to %qT, which is is not a class type",
14269 return error_mark_node
;
14273 return cp_build_qualified_type_real
14274 (f
, cp_type_quals (f
) | cp_type_quals (t
), complain
);
14277 case UNBOUND_CLASS_TEMPLATE
:
14279 tree ctx
= tsubst_aggr_type (TYPE_CONTEXT (t
), args
, complain
,
14280 in_decl
, /*entering_scope=*/1);
14281 tree name
= TYPE_IDENTIFIER (t
);
14282 tree parm_list
= DECL_TEMPLATE_PARMS (TYPE_NAME (t
));
14284 if (ctx
== error_mark_node
|| name
== error_mark_node
)
14285 return error_mark_node
;
14288 parm_list
= tsubst_template_parms (parm_list
, args
, complain
);
14289 return make_unbound_class_template (ctx
, name
, parm_list
, complain
);
14296 ++cp_unevaluated_operand
;
14297 ++c_inhibit_evaluation_warnings
;
14299 type
= tsubst_expr (TYPEOF_TYPE_EXPR (t
), args
,
14301 /*integral_constant_expression_p=*/false);
14303 --cp_unevaluated_operand
;
14304 --c_inhibit_evaluation_warnings
;
14306 type
= finish_typeof (type
);
14307 return cp_build_qualified_type_real (type
,
14309 | cp_type_quals (type
),
14313 case DECLTYPE_TYPE
:
14317 ++cp_unevaluated_operand
;
14318 ++c_inhibit_evaluation_warnings
;
14320 type
= tsubst_copy_and_build (DECLTYPE_TYPE_EXPR (t
), args
,
14321 complain
|tf_decltype
, in_decl
,
14322 /*function_p*/false,
14323 /*integral_constant_expression*/false);
14325 if (DECLTYPE_FOR_INIT_CAPTURE (t
))
14327 if (type
== NULL_TREE
)
14329 if (complain
& tf_error
)
14330 error ("empty initializer in lambda init-capture");
14331 type
= error_mark_node
;
14333 else if (TREE_CODE (type
) == TREE_LIST
)
14334 type
= build_x_compound_expr_from_list (type
, ELK_INIT
, complain
);
14337 --cp_unevaluated_operand
;
14338 --c_inhibit_evaluation_warnings
;
14340 if (DECLTYPE_FOR_LAMBDA_CAPTURE (t
))
14341 type
= lambda_capture_field_type (type
,
14342 DECLTYPE_FOR_INIT_CAPTURE (t
),
14343 DECLTYPE_FOR_REF_CAPTURE (t
));
14344 else if (DECLTYPE_FOR_LAMBDA_PROXY (t
))
14345 type
= lambda_proxy_type (type
);
14348 bool id
= DECLTYPE_TYPE_ID_EXPR_OR_MEMBER_ACCESS_P (t
);
14349 if (id
&& TREE_CODE (DECLTYPE_TYPE_EXPR (t
)) == BIT_NOT_EXPR
14351 /* In a template ~id could be either a complement expression
14352 or an unqualified-id naming a destructor; if instantiating
14353 it produces an expression, it's not an id-expression or
14356 type
= finish_decltype_type (type
, id
, complain
);
14358 return cp_build_qualified_type_real (type
,
14360 | cp_type_quals (type
),
14361 complain
| tf_ignore_bad_quals
);
14364 case UNDERLYING_TYPE
:
14366 tree type
= tsubst (UNDERLYING_TYPE_TYPE (t
), args
,
14367 complain
, in_decl
);
14368 return finish_underlying_type (type
);
14371 case TYPE_ARGUMENT_PACK
:
14372 case NONTYPE_ARGUMENT_PACK
:
14376 if (code
== NONTYPE_ARGUMENT_PACK
)
14377 r
= make_node (code
);
14379 r
= cxx_make_type (code
);
14381 tree pack_args
= ARGUMENT_PACK_ARGS (t
);
14382 pack_args
= tsubst_template_args (pack_args
, args
, complain
, in_decl
);
14383 SET_ARGUMENT_PACK_ARGS (r
, pack_args
);
14401 /* We should use one of the expression tsubsts for these codes. */
14402 gcc_unreachable ();
14405 sorry ("use of %qs in template", get_tree_code_name (code
));
14406 return error_mark_node
;
14410 /* tsubst a BASELINK. OBJECT_TYPE, if non-NULL, is the type of the
14411 expression on the left-hand side of the "." or "->" operator. A
14412 baselink indicates a function from a base class. Both the
14413 BASELINK_ACCESS_BINFO and the base class referenced may indicate
14414 bases of the template class, rather than the instantiated class.
14415 In addition, lookups that were not ambiguous before may be
14416 ambiguous now. Therefore, we perform the lookup again. */
14419 tsubst_baselink (tree baselink
, tree object_type
,
14420 tree args
, tsubst_flags_t complain
, tree in_decl
)
14422 bool qualified
= BASELINK_QUALIFIED_P (baselink
);
14424 tree qualifying_scope
= BINFO_TYPE (BASELINK_ACCESS_BINFO (baselink
));
14425 qualifying_scope
= tsubst (qualifying_scope
, args
, complain
, in_decl
);
14427 tree optype
= BASELINK_OPTYPE (baselink
);
14428 optype
= tsubst (optype
, args
, complain
, in_decl
);
14430 tree template_args
= NULL_TREE
;
14431 bool template_id_p
= false;
14432 tree fns
= BASELINK_FUNCTIONS (baselink
);
14433 if (TREE_CODE (fns
) == TEMPLATE_ID_EXPR
)
14435 template_id_p
= true;
14436 template_args
= TREE_OPERAND (fns
, 1);
14437 fns
= TREE_OPERAND (fns
, 0);
14439 template_args
= tsubst_template_args (template_args
, args
,
14440 complain
, in_decl
);
14443 tree name
= OVL_NAME (fns
);
14444 if (IDENTIFIER_CONV_OP_P (name
))
14445 name
= make_conv_op_name (optype
);
14447 baselink
= lookup_fnfields (qualifying_scope
, name
, /*protect=*/1);
14450 if ((complain
& tf_error
) && constructor_name_p (name
, qualifying_scope
))
14451 error ("cannot call constructor %<%T::%D%> directly",
14452 qualifying_scope
, name
);
14453 return error_mark_node
;
14456 /* If lookup found a single function, mark it as used at this point.
14457 (If it lookup found multiple functions the one selected later by
14458 overload resolution will be marked as used at that point.) */
14459 if (BASELINK_P (baselink
))
14460 fns
= BASELINK_FUNCTIONS (baselink
);
14461 if (!template_id_p
&& !really_overloaded_fn (fns
)
14462 && !mark_used (OVL_FIRST (fns
), complain
) && !(complain
& tf_error
))
14463 return error_mark_node
;
14465 if (BASELINK_P (baselink
))
14467 /* Add back the template arguments, if present. */
14469 BASELINK_FUNCTIONS (baselink
)
14470 = build2 (TEMPLATE_ID_EXPR
, unknown_type_node
,
14471 BASELINK_FUNCTIONS (baselink
), template_args
);
14473 /* Update the conversion operator type. */
14474 BASELINK_OPTYPE (baselink
) = optype
;
14478 object_type
= current_class_type
;
14480 if (qualified
|| name
== complete_dtor_identifier
)
14482 baselink
= adjust_result_of_qualified_name_lookup (baselink
,
14486 /* We need to call adjust_result_of_qualified_name_lookup in case the
14487 destructor names a base class, but we unset BASELINK_QUALIFIED_P
14488 so that we still get virtual function binding. */
14489 BASELINK_QUALIFIED_P (baselink
) = false;
14495 /* Like tsubst_expr for a SCOPE_REF, given by QUALIFIED_ID. DONE is
14496 true if the qualified-id will be a postfix-expression in-and-of
14497 itself; false if more of the postfix-expression follows the
14498 QUALIFIED_ID. ADDRESS_P is true if the qualified-id is the operand
14502 tsubst_qualified_id (tree qualified_id
, tree args
,
14503 tsubst_flags_t complain
, tree in_decl
,
14504 bool done
, bool address_p
)
14510 tree template_args
;
14511 location_t loc
= UNKNOWN_LOCATION
;
14513 gcc_assert (TREE_CODE (qualified_id
) == SCOPE_REF
);
14515 /* Figure out what name to look up. */
14516 name
= TREE_OPERAND (qualified_id
, 1);
14517 if (TREE_CODE (name
) == TEMPLATE_ID_EXPR
)
14519 is_template
= true;
14520 loc
= EXPR_LOCATION (name
);
14521 template_args
= TREE_OPERAND (name
, 1);
14523 template_args
= tsubst_template_args (template_args
, args
,
14524 complain
, in_decl
);
14525 if (template_args
== error_mark_node
)
14526 return error_mark_node
;
14527 name
= TREE_OPERAND (name
, 0);
14531 is_template
= false;
14532 template_args
= NULL_TREE
;
14535 /* Substitute into the qualifying scope. When there are no ARGS, we
14536 are just trying to simplify a non-dependent expression. In that
14537 case the qualifying scope may be dependent, and, in any case,
14538 substituting will not help. */
14539 scope
= TREE_OPERAND (qualified_id
, 0);
14542 scope
= tsubst (scope
, args
, complain
, in_decl
);
14543 expr
= tsubst_copy (name
, args
, complain
, in_decl
);
14548 if (dependent_scope_p (scope
))
14551 expr
= build_min_nt_loc (loc
, TEMPLATE_ID_EXPR
, expr
, template_args
);
14552 tree r
= build_qualified_name (NULL_TREE
, scope
, expr
,
14553 QUALIFIED_NAME_IS_TEMPLATE (qualified_id
));
14554 REF_PARENTHESIZED_P (r
) = REF_PARENTHESIZED_P (qualified_id
);
14558 if (!BASELINK_P (name
) && !DECL_P (expr
))
14560 if (TREE_CODE (expr
) == BIT_NOT_EXPR
)
14562 /* A BIT_NOT_EXPR is used to represent a destructor. */
14563 if (!check_dtor_name (scope
, TREE_OPERAND (expr
, 0)))
14565 error ("qualifying type %qT does not match destructor name ~%qT",
14566 scope
, TREE_OPERAND (expr
, 0));
14567 expr
= error_mark_node
;
14570 expr
= lookup_qualified_name (scope
, complete_dtor_identifier
,
14571 /*is_type_p=*/0, false);
14574 expr
= lookup_qualified_name (scope
, expr
, /*is_type_p=*/0, false);
14575 if (TREE_CODE (TREE_CODE (expr
) == TEMPLATE_DECL
14576 ? DECL_TEMPLATE_RESULT (expr
) : expr
) == TYPE_DECL
)
14578 if (complain
& tf_error
)
14580 error ("dependent-name %qE is parsed as a non-type, but "
14581 "instantiation yields a type", qualified_id
);
14582 inform (input_location
, "say %<typename %E%> if a type is meant", qualified_id
);
14584 return error_mark_node
;
14590 check_accessibility_of_qualified_id (expr
, /*object_type=*/NULL_TREE
,
14592 /* Remember that there was a reference to this entity. */
14593 if (!mark_used (expr
, complain
) && !(complain
& tf_error
))
14594 return error_mark_node
;
14597 if (expr
== error_mark_node
|| TREE_CODE (expr
) == TREE_LIST
)
14599 if (complain
& tf_error
)
14600 qualified_name_lookup_error (scope
,
14601 TREE_OPERAND (qualified_id
, 1),
14602 expr
, input_location
);
14603 return error_mark_node
;
14608 if (variable_template_p (expr
))
14609 expr
= lookup_and_finish_template_variable (expr
, template_args
,
14612 expr
= lookup_template_function (expr
, template_args
);
14615 if (expr
== error_mark_node
&& complain
& tf_error
)
14616 qualified_name_lookup_error (scope
, TREE_OPERAND (qualified_id
, 1),
14617 expr
, input_location
);
14618 else if (TYPE_P (scope
))
14620 expr
= (adjust_result_of_qualified_name_lookup
14621 (expr
, scope
, current_nonlambda_class_type ()));
14622 expr
= (finish_qualified_id_expr
14623 (scope
, expr
, done
, address_p
&& PTRMEM_OK_P (qualified_id
),
14624 QUALIFIED_NAME_IS_TEMPLATE (qualified_id
),
14625 /*template_arg_p=*/false, complain
));
14628 /* Expressions do not generally have reference type. */
14629 if (TREE_CODE (expr
) != SCOPE_REF
14630 /* However, if we're about to form a pointer-to-member, we just
14631 want the referenced member referenced. */
14632 && TREE_CODE (expr
) != OFFSET_REF
)
14633 expr
= convert_from_reference (expr
);
14635 if (REF_PARENTHESIZED_P (qualified_id
))
14636 expr
= force_paren_expr (expr
);
14641 /* tsubst the initializer for a VAR_DECL. INIT is the unsubstituted
14642 initializer, DECL is the substituted VAR_DECL. Other arguments are as
14646 tsubst_init (tree init
, tree decl
, tree args
,
14647 tsubst_flags_t complain
, tree in_decl
)
14652 init
= tsubst_expr (init
, args
, complain
, in_decl
, false);
14654 if (!init
&& TREE_TYPE (decl
) != error_mark_node
)
14656 /* If we had an initializer but it
14657 instantiated to nothing,
14658 value-initialize the object. This will
14659 only occur when the initializer was a
14660 pack expansion where the parameter packs
14661 used in that expansion were of length
14663 init
= build_value_init (TREE_TYPE (decl
),
14665 if (TREE_CODE (init
) == AGGR_INIT_EXPR
)
14666 init
= get_target_expr_sfinae (init
, complain
);
14667 if (TREE_CODE (init
) == TARGET_EXPR
)
14668 TARGET_EXPR_DIRECT_INIT_P (init
) = true;
14674 /* Like tsubst, but deals with expressions. This function just replaces
14675 template parms; to finish processing the resultant expression, use
14676 tsubst_copy_and_build or tsubst_expr. */
14679 tsubst_copy (tree t
, tree args
, tsubst_flags_t complain
, tree in_decl
)
14681 enum tree_code code
;
14684 if (t
== NULL_TREE
|| t
== error_mark_node
|| args
== NULL_TREE
)
14687 code
= TREE_CODE (t
);
14692 r
= retrieve_local_specialization (t
);
14694 if (r
== NULL_TREE
)
14696 /* We get here for a use of 'this' in an NSDMI. */
14697 if (DECL_NAME (t
) == this_identifier
&& current_class_ptr
)
14698 return current_class_ptr
;
14700 /* This can happen for a parameter name used later in a function
14701 declaration (such as in a late-specified return type). Just
14702 make a dummy decl, since it's only used for its type. */
14703 gcc_assert (cp_unevaluated_operand
!= 0);
14704 r
= tsubst_decl (t
, args
, complain
);
14705 /* Give it the template pattern as its context; its true context
14706 hasn't been instantiated yet and this is good enough for
14708 DECL_CONTEXT (r
) = DECL_CONTEXT (t
);
14711 if (TREE_CODE (r
) == ARGUMENT_PACK_SELECT
)
14712 r
= ARGUMENT_PACK_SELECT_ARG (r
);
14713 if (!mark_used (r
, complain
) && !(complain
& tf_error
))
14714 return error_mark_node
;
14722 if (DECL_TEMPLATE_PARM_P (t
))
14723 return tsubst_copy (DECL_INITIAL (t
), args
, complain
, in_decl
);
14724 /* There is no need to substitute into namespace-scope
14726 if (DECL_NAMESPACE_SCOPE_P (t
))
14728 /* If ARGS is NULL, then T is known to be non-dependent. */
14729 if (args
== NULL_TREE
)
14730 return scalar_constant_value (t
);
14732 /* Unfortunately, we cannot just call lookup_name here.
14735 template <int I> int f() {
14737 struct S { void g() { E e = a; } };
14740 When we instantiate f<7>::S::g(), say, lookup_name is not
14741 clever enough to find f<7>::a. */
14743 = tsubst_aggr_type (DECL_CONTEXT (t
), args
, complain
, in_decl
,
14744 /*entering_scope=*/0);
14746 for (v
= TYPE_VALUES (enum_type
);
14748 v
= TREE_CHAIN (v
))
14749 if (TREE_PURPOSE (v
) == DECL_NAME (t
))
14750 return TREE_VALUE (v
);
14752 /* We didn't find the name. That should never happen; if
14753 name-lookup found it during preliminary parsing, we
14754 should find it again here during instantiation. */
14755 gcc_unreachable ();
14760 if (PACK_EXPANSION_P (TREE_TYPE (t
)))
14762 /* Check for a local specialization set up by
14763 tsubst_pack_expansion. */
14764 if (tree r
= retrieve_local_specialization (t
))
14766 if (TREE_CODE (r
) == ARGUMENT_PACK_SELECT
)
14767 r
= ARGUMENT_PACK_SELECT_ARG (r
);
14771 /* When retrieving a capture pack from a generic lambda, remove the
14772 lambda call op's own template argument list from ARGS. Only the
14773 template arguments active for the closure type should be used to
14774 retrieve the pack specialization. */
14775 if (LAMBDA_FUNCTION_P (current_function_decl
)
14776 && (template_class_depth (DECL_CONTEXT (t
))
14777 != TMPL_ARGS_DEPTH (args
)))
14778 args
= strip_innermost_template_args (args
, 1);
14780 /* Otherwise return the full NONTYPE_ARGUMENT_PACK that
14781 tsubst_decl put in the hash table. */
14782 return retrieve_specialization (t
, args
, 0);
14785 if (DECL_CONTEXT (t
))
14789 ctx
= tsubst_aggr_type (DECL_CONTEXT (t
), args
, complain
, in_decl
,
14790 /*entering_scope=*/1);
14791 if (ctx
!= DECL_CONTEXT (t
))
14793 tree r
= lookup_field (ctx
, DECL_NAME (t
), 0, false);
14796 if (complain
& tf_error
)
14797 error ("using invalid field %qD", t
);
14798 return error_mark_node
;
14807 case FUNCTION_DECL
:
14808 if (DECL_LANG_SPECIFIC (t
) && DECL_TEMPLATE_INFO (t
))
14809 r
= tsubst (t
, args
, complain
, in_decl
);
14810 else if (local_variable_p (t
)
14811 && uses_template_parms (DECL_CONTEXT (t
)))
14813 r
= retrieve_local_specialization (t
);
14814 if (r
== NULL_TREE
)
14816 /* First try name lookup to find the instantiation. */
14817 r
= lookup_name (DECL_NAME (t
));
14818 if (r
&& !is_capture_proxy (r
))
14820 /* Make sure that the one we found is the one we want. */
14821 tree ctx
= enclosing_instantiation_of (DECL_CONTEXT (t
));
14822 if (ctx
!= DECL_CONTEXT (r
))
14830 /* This can happen for a variable used in a
14831 late-specified return type of a local lambda, or for a
14832 local static or constant. Building a new VAR_DECL
14833 should be OK in all those cases. */
14834 r
= tsubst_decl (t
, args
, complain
);
14835 if (local_specializations
)
14836 /* Avoid infinite recursion (79640). */
14837 register_local_specialization (r
, t
);
14838 if (decl_maybe_constant_var_p (r
))
14840 /* We can't call cp_finish_decl, so handle the
14841 initializer by hand. */
14842 tree init
= tsubst_init (DECL_INITIAL (t
), r
, args
,
14843 complain
, in_decl
);
14844 if (!processing_template_decl
)
14845 init
= maybe_constant_init (init
);
14846 if (processing_template_decl
14847 ? potential_constant_expression (init
)
14848 : reduced_constant_expression_p (init
))
14849 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (r
)
14850 = TREE_CONSTANT (r
) = true;
14851 DECL_INITIAL (r
) = init
;
14852 if (tree auto_node
= type_uses_auto (TREE_TYPE (r
)))
14854 = do_auto_deduction (TREE_TYPE (r
), init
, auto_node
,
14855 complain
, adc_variable_type
);
14857 gcc_assert (cp_unevaluated_operand
|| TREE_STATIC (r
)
14858 || decl_constant_var_p (r
)
14859 || errorcount
|| sorrycount
);
14860 if (!processing_template_decl
14861 && !TREE_STATIC (r
))
14862 r
= process_outer_var_ref (r
, complain
);
14864 /* Remember this for subsequent uses. */
14865 if (local_specializations
)
14866 register_local_specialization (r
, t
);
14871 if (!mark_used (r
, complain
))
14872 return error_mark_node
;
14875 case NAMESPACE_DECL
:
14879 /* An OVERLOAD will always be a non-dependent overload set; an
14880 overload set from function scope will just be represented with an
14881 IDENTIFIER_NODE, and from class scope with a BASELINK. */
14882 gcc_assert (!uses_template_parms (t
));
14883 /* We must have marked any lookups as persistent. */
14884 gcc_assert (!OVL_LOOKUP_P (t
) || OVL_USED_P (t
));
14888 return tsubst_baselink (t
, current_nonlambda_class_type (),
14889 args
, complain
, in_decl
);
14891 case TEMPLATE_DECL
:
14892 if (DECL_TEMPLATE_TEMPLATE_PARM_P (t
))
14893 return tsubst (TREE_TYPE (DECL_TEMPLATE_RESULT (t
)),
14894 args
, complain
, in_decl
);
14895 else if (DECL_FUNCTION_TEMPLATE_P (t
) && DECL_MEMBER_TEMPLATE_P (t
))
14896 return tsubst (t
, args
, complain
, in_decl
);
14897 else if (DECL_CLASS_SCOPE_P (t
)
14898 && uses_template_parms (DECL_CONTEXT (t
)))
14900 /* Template template argument like the following example need
14903 template <template <class> class TT> struct C {};
14904 template <class T> struct D {
14905 template <class U> struct E {};
14910 We are processing the template argument `E' in #1 for
14911 the template instantiation #2. Originally, `E' is a
14912 TEMPLATE_DECL with `D<T>' as its DECL_CONTEXT. Now we
14913 have to substitute this with one having context `D<int>'. */
14915 tree context
= tsubst (DECL_CONTEXT (t
), args
, complain
, in_decl
);
14916 if (dependent_scope_p (context
))
14918 /* When rewriting a constructor into a deduction guide, a
14919 non-dependent name can become dependent, so memtmpl<args>
14920 becomes context::template memtmpl<args>. */
14921 tree type
= tsubst (TREE_TYPE (t
), args
, complain
, in_decl
);
14922 return build_qualified_name (type
, context
, DECL_NAME (t
),
14925 return lookup_field (context
, DECL_NAME(t
), 0, false);
14928 /* Ordinary template template argument. */
14932 case REINTERPRET_CAST_EXPR
:
14933 case CONST_CAST_EXPR
:
14934 case STATIC_CAST_EXPR
:
14935 case DYNAMIC_CAST_EXPR
:
14936 case IMPLICIT_CONV_EXPR
:
14940 tree type
= tsubst (TREE_TYPE (t
), args
, complain
, in_decl
);
14941 tree op0
= tsubst_copy (TREE_OPERAND (t
, 0), args
, complain
, in_decl
);
14942 return build1 (code
, type
, op0
);
14946 if (PACK_EXPANSION_P (TREE_OPERAND (t
, 0))
14947 || ARGUMENT_PACK_P (TREE_OPERAND (t
, 0)))
14949 tree expanded
, op
= TREE_OPERAND (t
, 0);
14952 if (SIZEOF_EXPR_TYPE_P (t
))
14953 op
= TREE_TYPE (op
);
14955 ++cp_unevaluated_operand
;
14956 ++c_inhibit_evaluation_warnings
;
14957 /* We only want to compute the number of arguments. */
14958 if (PACK_EXPANSION_P (op
))
14959 expanded
= tsubst_pack_expansion (op
, args
, complain
, in_decl
);
14961 expanded
= tsubst_template_args (ARGUMENT_PACK_ARGS (op
),
14962 args
, complain
, in_decl
);
14963 --cp_unevaluated_operand
;
14964 --c_inhibit_evaluation_warnings
;
14966 if (TREE_CODE (expanded
) == TREE_VEC
)
14968 len
= TREE_VEC_LENGTH (expanded
);
14969 /* Set TREE_USED for the benefit of -Wunused. */
14970 for (int i
= 0; i
< len
; i
++)
14971 if (DECL_P (TREE_VEC_ELT (expanded
, i
)))
14972 TREE_USED (TREE_VEC_ELT (expanded
, i
)) = true;
14975 if (expanded
== error_mark_node
)
14976 return error_mark_node
;
14977 else if (PACK_EXPANSION_P (expanded
)
14978 || (TREE_CODE (expanded
) == TREE_VEC
14979 && pack_expansion_args_count (expanded
)))
14982 if (PACK_EXPANSION_P (expanded
))
14984 else if (TREE_VEC_LENGTH (expanded
) == 1)
14985 expanded
= TREE_VEC_ELT (expanded
, 0);
14987 expanded
= make_argument_pack (expanded
);
14989 if (TYPE_P (expanded
))
14990 return cxx_sizeof_or_alignof_type (expanded
, SIZEOF_EXPR
,
14991 complain
& tf_error
);
14993 return cxx_sizeof_or_alignof_expr (expanded
, SIZEOF_EXPR
,
14994 complain
& tf_error
);
14997 return build_int_cst (size_type_node
, len
);
14999 if (SIZEOF_EXPR_TYPE_P (t
))
15001 r
= tsubst (TREE_TYPE (TREE_OPERAND (t
, 0)),
15002 args
, complain
, in_decl
);
15003 r
= build1 (NOP_EXPR
, r
, error_mark_node
);
15004 r
= build1 (SIZEOF_EXPR
,
15005 tsubst (TREE_TYPE (t
), args
, complain
, in_decl
), r
);
15006 SIZEOF_EXPR_TYPE_P (r
) = 1;
15013 case TRUTH_NOT_EXPR
:
15016 case UNARY_PLUS_EXPR
: /* Unary + */
15018 case AT_ENCODE_EXPR
:
15022 case REALPART_EXPR
:
15023 case IMAGPART_EXPR
:
15026 tree type
= tsubst (TREE_TYPE (t
), args
, complain
, in_decl
);
15027 tree op0
= tsubst_copy (TREE_OPERAND (t
, 0), args
, complain
, in_decl
);
15028 return build1 (code
, type
, op0
);
15031 case COMPONENT_REF
:
15036 object
= tsubst_copy (TREE_OPERAND (t
, 0), args
, complain
, in_decl
);
15037 name
= TREE_OPERAND (t
, 1);
15038 if (TREE_CODE (name
) == BIT_NOT_EXPR
)
15040 name
= tsubst_copy (TREE_OPERAND (name
, 0), args
,
15041 complain
, in_decl
);
15042 name
= build1 (BIT_NOT_EXPR
, NULL_TREE
, name
);
15044 else if (TREE_CODE (name
) == SCOPE_REF
15045 && TREE_CODE (TREE_OPERAND (name
, 1)) == BIT_NOT_EXPR
)
15047 tree base
= tsubst_copy (TREE_OPERAND (name
, 0), args
,
15048 complain
, in_decl
);
15049 name
= TREE_OPERAND (name
, 1);
15050 name
= tsubst_copy (TREE_OPERAND (name
, 0), args
,
15051 complain
, in_decl
);
15052 name
= build1 (BIT_NOT_EXPR
, NULL_TREE
, name
);
15053 name
= build_qualified_name (/*type=*/NULL_TREE
,
15055 /*template_p=*/false);
15057 else if (BASELINK_P (name
))
15058 name
= tsubst_baselink (name
,
15059 non_reference (TREE_TYPE (object
)),
15063 name
= tsubst_copy (name
, args
, complain
, in_decl
);
15064 return build_nt (COMPONENT_REF
, object
, name
, NULL_TREE
);
15070 case TRUNC_DIV_EXPR
:
15071 case CEIL_DIV_EXPR
:
15072 case FLOOR_DIV_EXPR
:
15073 case ROUND_DIV_EXPR
:
15074 case EXACT_DIV_EXPR
:
15078 case TRUNC_MOD_EXPR
:
15079 case FLOOR_MOD_EXPR
:
15080 case TRUTH_ANDIF_EXPR
:
15081 case TRUTH_ORIF_EXPR
:
15082 case TRUTH_AND_EXPR
:
15083 case TRUTH_OR_EXPR
:
15096 case COMPOUND_EXPR
:
15099 case PREDECREMENT_EXPR
:
15100 case PREINCREMENT_EXPR
:
15101 case POSTDECREMENT_EXPR
:
15102 case POSTINCREMENT_EXPR
:
15104 tree op0
= tsubst_copy (TREE_OPERAND (t
, 0), args
, complain
, in_decl
);
15105 tree op1
= tsubst_copy (TREE_OPERAND (t
, 1), args
, complain
, in_decl
);
15106 return build_nt (code
, op0
, op1
);
15111 tree op0
= tsubst_copy (TREE_OPERAND (t
, 0), args
, complain
, in_decl
);
15112 tree op1
= tsubst_copy (TREE_OPERAND (t
, 1), args
, complain
, in_decl
);
15113 return build_qualified_name (/*type=*/NULL_TREE
, op0
, op1
,
15114 QUALIFIED_NAME_IS_TEMPLATE (t
));
15119 tree op0
= tsubst_copy (TREE_OPERAND (t
, 0), args
, complain
, in_decl
);
15120 tree op1
= tsubst_copy (TREE_OPERAND (t
, 1), args
, complain
, in_decl
);
15121 return build_nt (ARRAY_REF
, op0
, op1
, NULL_TREE
, NULL_TREE
);
15126 int n
= VL_EXP_OPERAND_LENGTH (t
);
15127 tree result
= build_vl_exp (CALL_EXPR
, n
);
15129 for (i
= 0; i
< n
; i
++)
15130 TREE_OPERAND (t
, i
) = tsubst_copy (TREE_OPERAND (t
, i
), args
,
15131 complain
, in_decl
);
15137 case PSEUDO_DTOR_EXPR
:
15138 case VEC_PERM_EXPR
:
15140 tree op0
= tsubst_copy (TREE_OPERAND (t
, 0), args
, complain
, in_decl
);
15141 tree op1
= tsubst_copy (TREE_OPERAND (t
, 1), args
, complain
, in_decl
);
15142 tree op2
= tsubst_copy (TREE_OPERAND (t
, 2), args
, complain
, in_decl
);
15143 r
= build_nt (code
, op0
, op1
, op2
);
15144 TREE_NO_WARNING (r
) = TREE_NO_WARNING (t
);
15150 tree op0
= tsubst_copy (TREE_OPERAND (t
, 0), args
, complain
, in_decl
);
15151 tree op1
= tsubst_copy (TREE_OPERAND (t
, 1), args
, complain
, in_decl
);
15152 tree op2
= tsubst_copy (TREE_OPERAND (t
, 2), args
, complain
, in_decl
);
15153 r
= build_nt (code
, op0
, op1
, op2
);
15154 NEW_EXPR_USE_GLOBAL (r
) = NEW_EXPR_USE_GLOBAL (t
);
15160 tree op0
= tsubst_copy (TREE_OPERAND (t
, 0), args
, complain
, in_decl
);
15161 tree op1
= tsubst_copy (TREE_OPERAND (t
, 1), args
, complain
, in_decl
);
15162 r
= build_nt (code
, op0
, op1
);
15163 DELETE_EXPR_USE_GLOBAL (r
) = DELETE_EXPR_USE_GLOBAL (t
);
15164 DELETE_EXPR_USE_VEC (r
) = DELETE_EXPR_USE_VEC (t
);
15168 case TEMPLATE_ID_EXPR
:
15170 /* Substituted template arguments */
15171 tree fn
= TREE_OPERAND (t
, 0);
15172 tree targs
= TREE_OPERAND (t
, 1);
15174 fn
= tsubst_copy (fn
, args
, complain
, in_decl
);
15176 targs
= tsubst_template_args (targs
, args
, complain
, in_decl
);
15178 return lookup_template_function (fn
, targs
);
15183 tree purpose
, value
, chain
;
15185 if (t
== void_list_node
)
15188 purpose
= TREE_PURPOSE (t
);
15190 purpose
= tsubst_copy (purpose
, args
, complain
, in_decl
);
15191 value
= TREE_VALUE (t
);
15193 value
= tsubst_copy (value
, args
, complain
, in_decl
);
15194 chain
= TREE_CHAIN (t
);
15195 if (chain
&& chain
!= void_type_node
)
15196 chain
= tsubst_copy (chain
, args
, complain
, in_decl
);
15197 if (purpose
== TREE_PURPOSE (t
)
15198 && value
== TREE_VALUE (t
)
15199 && chain
== TREE_CHAIN (t
))
15201 return tree_cons (purpose
, value
, chain
);
15206 case ENUMERAL_TYPE
:
15208 case TEMPLATE_TYPE_PARM
:
15209 case TEMPLATE_TEMPLATE_PARM
:
15210 case BOUND_TEMPLATE_TEMPLATE_PARM
:
15211 case TEMPLATE_PARM_INDEX
:
15213 case REFERENCE_TYPE
:
15215 case FUNCTION_TYPE
:
15218 case TYPENAME_TYPE
:
15219 case UNBOUND_CLASS_TEMPLATE
:
15221 case DECLTYPE_TYPE
:
15223 return tsubst (t
, args
, complain
, in_decl
);
15227 /* Fall through. */
15228 case IDENTIFIER_NODE
:
15229 if (IDENTIFIER_CONV_OP_P (t
))
15231 tree new_type
= tsubst (TREE_TYPE (t
), args
, complain
, in_decl
);
15232 return make_conv_op_name (new_type
);
15238 /* This is handled by tsubst_copy_and_build. */
15239 gcc_unreachable ();
15243 tree op0
= tsubst_copy (TREE_OPERAND (t
, 0), args
, complain
, in_decl
);
15244 tree type
= tsubst (TREE_TYPE (t
), args
, complain
, in_decl
);
15245 return build_x_va_arg (EXPR_LOCATION (t
), op0
, type
);
15248 case CLEANUP_POINT_EXPR
:
15249 /* We shouldn't have built any of these during initial template
15250 generation. Instead, they should be built during instantiation
15251 in response to the saved STMT_IS_FULL_EXPR_P setting. */
15252 gcc_unreachable ();
15256 tree type
= tsubst (TREE_TYPE (t
), args
, complain
, in_decl
);
15257 tree op0
= tsubst_copy (TREE_OPERAND (t
, 0), args
, complain
, in_decl
);
15258 tree op1
= tsubst_copy (TREE_OPERAND (t
, 1), args
, complain
, in_decl
);
15259 r
= build2 (code
, type
, op0
, op1
);
15260 PTRMEM_OK_P (r
) = PTRMEM_OK_P (t
);
15261 if (!mark_used (TREE_OPERAND (r
, 1), complain
)
15262 && !(complain
& tf_error
))
15263 return error_mark_node
;
15267 case EXPR_PACK_EXPANSION
:
15268 error ("invalid use of pack expansion expression");
15269 return error_mark_node
;
15271 case NONTYPE_ARGUMENT_PACK
:
15272 error ("use %<...%> to expand argument pack");
15273 return error_mark_node
;
15276 gcc_checking_assert (t
== void_node
&& VOID_TYPE_P (TREE_TYPE (t
)));
15284 /* Instantiate any typedefs in the type. */
15285 tree type
= tsubst (TREE_TYPE (t
), args
, complain
, in_decl
);
15286 r
= fold_convert (type
, t
);
15287 gcc_assert (TREE_CODE (r
) == code
);
15292 /* These can sometimes show up in a partial instantiation, but never
15293 involve template parms. */
15294 gcc_assert (!uses_template_parms (t
));
15297 case UNARY_LEFT_FOLD_EXPR
:
15298 return tsubst_unary_left_fold (t
, args
, complain
, in_decl
);
15299 case UNARY_RIGHT_FOLD_EXPR
:
15300 return tsubst_unary_right_fold (t
, args
, complain
, in_decl
);
15301 case BINARY_LEFT_FOLD_EXPR
:
15302 return tsubst_binary_left_fold (t
, args
, complain
, in_decl
);
15303 case BINARY_RIGHT_FOLD_EXPR
:
15304 return tsubst_binary_right_fold (t
, args
, complain
, in_decl
);
15309 /* We shouldn't get here, but keep going if !flag_checking. */
15311 gcc_unreachable ();
15316 /* Helper function for tsubst_omp_clauses, used for instantiation of
15317 OMP_CLAUSE_DECL of clauses. */
15320 tsubst_omp_clause_decl (tree decl
, tree args
, tsubst_flags_t complain
,
15323 if (decl
== NULL_TREE
)
15326 /* Handle an OpenMP array section represented as a TREE_LIST (or
15327 OMP_CLAUSE_DEPEND_KIND). An OMP_CLAUSE_DEPEND (with a depend
15328 kind of OMP_CLAUSE_DEPEND_SINK) can also be represented as a
15329 TREE_LIST. We can handle it exactly the same as an array section
15330 (purpose, value, and a chain), even though the nomenclature
15331 (low_bound, length, etc) is different. */
15332 if (TREE_CODE (decl
) == TREE_LIST
)
15335 = tsubst_expr (TREE_PURPOSE (decl
), args
, complain
, in_decl
,
15336 /*integral_constant_expression_p=*/false);
15337 tree length
= tsubst_expr (TREE_VALUE (decl
), args
, complain
, in_decl
,
15338 /*integral_constant_expression_p=*/false);
15339 tree chain
= tsubst_omp_clause_decl (TREE_CHAIN (decl
), args
, complain
,
15341 if (TREE_PURPOSE (decl
) == low_bound
15342 && TREE_VALUE (decl
) == length
15343 && TREE_CHAIN (decl
) == chain
)
15345 tree ret
= tree_cons (low_bound
, length
, chain
);
15346 OMP_CLAUSE_DEPEND_SINK_NEGATIVE (ret
)
15347 = OMP_CLAUSE_DEPEND_SINK_NEGATIVE (decl
);
15350 tree ret
= tsubst_expr (decl
, args
, complain
, in_decl
,
15351 /*integral_constant_expression_p=*/false);
15352 /* Undo convert_from_reference tsubst_expr could have called. */
15354 && REFERENCE_REF_P (ret
)
15355 && !REFERENCE_REF_P (decl
))
15356 ret
= TREE_OPERAND (ret
, 0);
15360 /* Like tsubst_copy, but specifically for OpenMP clauses. */
15363 tsubst_omp_clauses (tree clauses
, enum c_omp_region_type ort
,
15364 tree args
, tsubst_flags_t complain
, tree in_decl
)
15366 tree new_clauses
= NULL_TREE
, nc
, oc
;
15367 tree linear_no_step
= NULL_TREE
;
15369 for (oc
= clauses
; oc
; oc
= OMP_CLAUSE_CHAIN (oc
))
15371 nc
= copy_node (oc
);
15372 OMP_CLAUSE_CHAIN (nc
) = new_clauses
;
15375 switch (OMP_CLAUSE_CODE (nc
))
15377 case OMP_CLAUSE_LASTPRIVATE
:
15378 if (OMP_CLAUSE_LASTPRIVATE_STMT (oc
))
15380 OMP_CLAUSE_LASTPRIVATE_STMT (nc
) = push_stmt_list ();
15381 tsubst_expr (OMP_CLAUSE_LASTPRIVATE_STMT (oc
), args
, complain
,
15382 in_decl
, /*integral_constant_expression_p=*/false);
15383 OMP_CLAUSE_LASTPRIVATE_STMT (nc
)
15384 = pop_stmt_list (OMP_CLAUSE_LASTPRIVATE_STMT (nc
));
15387 case OMP_CLAUSE_PRIVATE
:
15388 case OMP_CLAUSE_SHARED
:
15389 case OMP_CLAUSE_FIRSTPRIVATE
:
15390 case OMP_CLAUSE_COPYIN
:
15391 case OMP_CLAUSE_COPYPRIVATE
:
15392 case OMP_CLAUSE_UNIFORM
:
15393 case OMP_CLAUSE_DEPEND
:
15394 case OMP_CLAUSE_FROM
:
15395 case OMP_CLAUSE_TO
:
15396 case OMP_CLAUSE_MAP
:
15397 case OMP_CLAUSE_USE_DEVICE_PTR
:
15398 case OMP_CLAUSE_IS_DEVICE_PTR
:
15399 OMP_CLAUSE_DECL (nc
)
15400 = tsubst_omp_clause_decl (OMP_CLAUSE_DECL (oc
), args
, complain
,
15403 case OMP_CLAUSE_TILE
:
15404 case OMP_CLAUSE_IF
:
15405 case OMP_CLAUSE_NUM_THREADS
:
15406 case OMP_CLAUSE_SCHEDULE
:
15407 case OMP_CLAUSE_COLLAPSE
:
15408 case OMP_CLAUSE_FINAL
:
15409 case OMP_CLAUSE_DEVICE
:
15410 case OMP_CLAUSE_DIST_SCHEDULE
:
15411 case OMP_CLAUSE_NUM_TEAMS
:
15412 case OMP_CLAUSE_THREAD_LIMIT
:
15413 case OMP_CLAUSE_SAFELEN
:
15414 case OMP_CLAUSE_SIMDLEN
:
15415 case OMP_CLAUSE_NUM_TASKS
:
15416 case OMP_CLAUSE_GRAINSIZE
:
15417 case OMP_CLAUSE_PRIORITY
:
15418 case OMP_CLAUSE_ORDERED
:
15419 case OMP_CLAUSE_HINT
:
15420 case OMP_CLAUSE_NUM_GANGS
:
15421 case OMP_CLAUSE_NUM_WORKERS
:
15422 case OMP_CLAUSE_VECTOR_LENGTH
:
15423 case OMP_CLAUSE_WORKER
:
15424 case OMP_CLAUSE_VECTOR
:
15425 case OMP_CLAUSE_ASYNC
:
15426 case OMP_CLAUSE_WAIT
:
15427 OMP_CLAUSE_OPERAND (nc
, 0)
15428 = tsubst_expr (OMP_CLAUSE_OPERAND (oc
, 0), args
, complain
,
15429 in_decl
, /*integral_constant_expression_p=*/false);
15431 case OMP_CLAUSE_REDUCTION
:
15432 if (OMP_CLAUSE_REDUCTION_PLACEHOLDER (oc
))
15434 tree placeholder
= OMP_CLAUSE_REDUCTION_PLACEHOLDER (oc
);
15435 if (TREE_CODE (placeholder
) == SCOPE_REF
)
15437 tree scope
= tsubst (TREE_OPERAND (placeholder
, 0), args
,
15438 complain
, in_decl
);
15439 OMP_CLAUSE_REDUCTION_PLACEHOLDER (nc
)
15440 = build_qualified_name (NULL_TREE
, scope
,
15441 TREE_OPERAND (placeholder
, 1),
15445 gcc_assert (identifier_p (placeholder
));
15447 OMP_CLAUSE_DECL (nc
)
15448 = tsubst_omp_clause_decl (OMP_CLAUSE_DECL (oc
), args
, complain
,
15451 case OMP_CLAUSE_GANG
:
15452 case OMP_CLAUSE_ALIGNED
:
15453 OMP_CLAUSE_DECL (nc
)
15454 = tsubst_omp_clause_decl (OMP_CLAUSE_DECL (oc
), args
, complain
,
15456 OMP_CLAUSE_OPERAND (nc
, 1)
15457 = tsubst_expr (OMP_CLAUSE_OPERAND (oc
, 1), args
, complain
,
15458 in_decl
, /*integral_constant_expression_p=*/false);
15460 case OMP_CLAUSE_LINEAR
:
15461 OMP_CLAUSE_DECL (nc
)
15462 = tsubst_omp_clause_decl (OMP_CLAUSE_DECL (oc
), args
, complain
,
15464 if (OMP_CLAUSE_LINEAR_STEP (oc
) == NULL_TREE
)
15466 gcc_assert (!linear_no_step
);
15467 linear_no_step
= nc
;
15469 else if (OMP_CLAUSE_LINEAR_VARIABLE_STRIDE (oc
))
15470 OMP_CLAUSE_LINEAR_STEP (nc
)
15471 = tsubst_omp_clause_decl (OMP_CLAUSE_LINEAR_STEP (oc
), args
,
15472 complain
, in_decl
);
15474 OMP_CLAUSE_LINEAR_STEP (nc
)
15475 = tsubst_expr (OMP_CLAUSE_LINEAR_STEP (oc
), args
, complain
,
15477 /*integral_constant_expression_p=*/false);
15479 case OMP_CLAUSE_NOWAIT
:
15480 case OMP_CLAUSE_DEFAULT
:
15481 case OMP_CLAUSE_UNTIED
:
15482 case OMP_CLAUSE_MERGEABLE
:
15483 case OMP_CLAUSE_INBRANCH
:
15484 case OMP_CLAUSE_NOTINBRANCH
:
15485 case OMP_CLAUSE_PROC_BIND
:
15486 case OMP_CLAUSE_FOR
:
15487 case OMP_CLAUSE_PARALLEL
:
15488 case OMP_CLAUSE_SECTIONS
:
15489 case OMP_CLAUSE_TASKGROUP
:
15490 case OMP_CLAUSE_NOGROUP
:
15491 case OMP_CLAUSE_THREADS
:
15492 case OMP_CLAUSE_SIMD
:
15493 case OMP_CLAUSE_DEFAULTMAP
:
15494 case OMP_CLAUSE_INDEPENDENT
:
15495 case OMP_CLAUSE_AUTO
:
15496 case OMP_CLAUSE_SEQ
:
15499 gcc_unreachable ();
15501 if ((ort
& C_ORT_OMP_DECLARE_SIMD
) == C_ORT_OMP
)
15502 switch (OMP_CLAUSE_CODE (nc
))
15504 case OMP_CLAUSE_SHARED
:
15505 case OMP_CLAUSE_PRIVATE
:
15506 case OMP_CLAUSE_FIRSTPRIVATE
:
15507 case OMP_CLAUSE_LASTPRIVATE
:
15508 case OMP_CLAUSE_COPYPRIVATE
:
15509 case OMP_CLAUSE_LINEAR
:
15510 case OMP_CLAUSE_REDUCTION
:
15511 case OMP_CLAUSE_USE_DEVICE_PTR
:
15512 case OMP_CLAUSE_IS_DEVICE_PTR
:
15513 /* tsubst_expr on SCOPE_REF results in returning
15514 finish_non_static_data_member result. Undo that here. */
15515 if (TREE_CODE (OMP_CLAUSE_DECL (oc
)) == SCOPE_REF
15516 && (TREE_CODE (TREE_OPERAND (OMP_CLAUSE_DECL (oc
), 1))
15517 == IDENTIFIER_NODE
))
15519 tree t
= OMP_CLAUSE_DECL (nc
);
15522 switch (TREE_CODE (v
))
15524 case COMPONENT_REF
:
15528 case POINTER_PLUS_EXPR
:
15529 v
= TREE_OPERAND (v
, 0);
15532 if (DECL_CONTEXT (v
) == current_function_decl
15533 && DECL_ARTIFICIAL (v
)
15534 && DECL_NAME (v
) == this_identifier
)
15535 OMP_CLAUSE_DECL (nc
) = TREE_OPERAND (t
, 1);
15542 else if (VAR_P (OMP_CLAUSE_DECL (oc
))
15543 && DECL_HAS_VALUE_EXPR_P (OMP_CLAUSE_DECL (oc
))
15544 && DECL_ARTIFICIAL (OMP_CLAUSE_DECL (oc
))
15545 && DECL_LANG_SPECIFIC (OMP_CLAUSE_DECL (oc
))
15546 && DECL_OMP_PRIVATIZED_MEMBER (OMP_CLAUSE_DECL (oc
)))
15548 tree decl
= OMP_CLAUSE_DECL (nc
);
15551 retrofit_lang_decl (decl
);
15552 DECL_OMP_PRIVATIZED_MEMBER (decl
) = 1;
15561 new_clauses
= nreverse (new_clauses
);
15562 if (ort
!= C_ORT_OMP_DECLARE_SIMD
)
15564 new_clauses
= finish_omp_clauses (new_clauses
, ort
);
15565 if (linear_no_step
)
15566 for (nc
= new_clauses
; nc
; nc
= OMP_CLAUSE_CHAIN (nc
))
15567 if (nc
== linear_no_step
)
15569 OMP_CLAUSE_LINEAR_STEP (nc
) = NULL_TREE
;
15573 return new_clauses
;
15576 /* Like tsubst_copy_and_build, but unshare TREE_LIST nodes. */
15579 tsubst_copy_asm_operands (tree t
, tree args
, tsubst_flags_t complain
,
15582 #define RECUR(t) tsubst_copy_asm_operands (t, args, complain, in_decl)
15584 tree purpose
, value
, chain
;
15589 if (TREE_CODE (t
) != TREE_LIST
)
15590 return tsubst_copy_and_build (t
, args
, complain
, in_decl
,
15591 /*function_p=*/false,
15592 /*integral_constant_expression_p=*/false);
15594 if (t
== void_list_node
)
15597 purpose
= TREE_PURPOSE (t
);
15599 purpose
= RECUR (purpose
);
15600 value
= TREE_VALUE (t
);
15603 if (TREE_CODE (value
) != LABEL_DECL
)
15604 value
= RECUR (value
);
15607 value
= lookup_label (DECL_NAME (value
));
15608 gcc_assert (TREE_CODE (value
) == LABEL_DECL
);
15609 TREE_USED (value
) = 1;
15612 chain
= TREE_CHAIN (t
);
15613 if (chain
&& chain
!= void_type_node
)
15614 chain
= RECUR (chain
);
15615 return tree_cons (purpose
, value
, chain
);
15619 /* Used to temporarily communicate the list of #pragma omp parallel
15620 clauses to #pragma omp for instantiation if they are combined
15623 static tree
*omp_parallel_combined_clauses
;
15625 /* Substitute one OMP_FOR iterator. */
15628 tsubst_omp_for_iterator (tree t
, int i
, tree declv
, tree orig_declv
,
15629 tree initv
, tree condv
, tree incrv
, tree
*clauses
,
15630 tree args
, tsubst_flags_t complain
, tree in_decl
,
15631 bool integral_constant_expression_p
)
15633 #define RECUR(NODE) \
15634 tsubst_expr ((NODE), args, complain, in_decl, \
15635 integral_constant_expression_p)
15636 tree decl
, init
, cond
, incr
;
15638 init
= TREE_VEC_ELT (OMP_FOR_INIT (t
), i
);
15639 gcc_assert (TREE_CODE (init
) == MODIFY_EXPR
);
15641 if (orig_declv
&& OMP_FOR_ORIG_DECLS (t
))
15643 tree o
= TREE_VEC_ELT (OMP_FOR_ORIG_DECLS (t
), i
);
15644 TREE_VEC_ELT (orig_declv
, i
) = RECUR (o
);
15647 decl
= TREE_OPERAND (init
, 0);
15648 init
= TREE_OPERAND (init
, 1);
15649 tree decl_expr
= NULL_TREE
;
15650 if (init
&& TREE_CODE (init
) == DECL_EXPR
)
15652 /* We need to jump through some hoops to handle declarations in the
15653 init-statement, since we might need to handle auto deduction,
15654 but we need to keep control of initialization. */
15656 init
= DECL_INITIAL (DECL_EXPR_DECL (init
));
15657 decl
= tsubst_decl (decl
, args
, complain
);
15661 if (TREE_CODE (decl
) == SCOPE_REF
)
15663 decl
= RECUR (decl
);
15664 if (TREE_CODE (decl
) == COMPONENT_REF
)
15668 switch (TREE_CODE (v
))
15670 case COMPONENT_REF
:
15674 case POINTER_PLUS_EXPR
:
15675 v
= TREE_OPERAND (v
, 0);
15678 if (DECL_CONTEXT (v
) == current_function_decl
15679 && DECL_ARTIFICIAL (v
)
15680 && DECL_NAME (v
) == this_identifier
)
15682 decl
= TREE_OPERAND (decl
, 1);
15683 decl
= omp_privatize_field (decl
, false);
15693 decl
= RECUR (decl
);
15695 init
= RECUR (init
);
15697 tree auto_node
= type_uses_auto (TREE_TYPE (decl
));
15698 if (auto_node
&& init
)
15700 = do_auto_deduction (TREE_TYPE (decl
), init
, auto_node
);
15702 gcc_assert (!type_dependent_expression_p (decl
));
15704 if (!CLASS_TYPE_P (TREE_TYPE (decl
)))
15708 /* Declare the variable, but don't let that initialize it. */
15709 tree init_sav
= DECL_INITIAL (DECL_EXPR_DECL (decl_expr
));
15710 DECL_INITIAL (DECL_EXPR_DECL (decl_expr
)) = NULL_TREE
;
15712 DECL_INITIAL (DECL_EXPR_DECL (decl_expr
)) = init_sav
;
15715 cond
= RECUR (TREE_VEC_ELT (OMP_FOR_COND (t
), i
));
15716 incr
= TREE_VEC_ELT (OMP_FOR_INCR (t
), i
);
15717 if (TREE_CODE (incr
) == MODIFY_EXPR
)
15719 tree lhs
= RECUR (TREE_OPERAND (incr
, 0));
15720 tree rhs
= RECUR (TREE_OPERAND (incr
, 1));
15721 incr
= build_x_modify_expr (EXPR_LOCATION (incr
), lhs
,
15722 NOP_EXPR
, rhs
, complain
);
15725 incr
= RECUR (incr
);
15726 TREE_VEC_ELT (declv
, i
) = decl
;
15727 TREE_VEC_ELT (initv
, i
) = init
;
15728 TREE_VEC_ELT (condv
, i
) = cond
;
15729 TREE_VEC_ELT (incrv
, i
) = incr
;
15735 /* Declare and initialize the variable. */
15743 for (j
= (omp_parallel_combined_clauses
== NULL
? 1 : 0); j
< 2; j
++)
15745 for (pc
= j
? clauses
: omp_parallel_combined_clauses
; *pc
; )
15747 if (OMP_CLAUSE_CODE (*pc
) == OMP_CLAUSE_PRIVATE
15748 && OMP_CLAUSE_DECL (*pc
) == decl
)
15750 else if (OMP_CLAUSE_CODE (*pc
) == OMP_CLAUSE_LASTPRIVATE
15751 && OMP_CLAUSE_DECL (*pc
) == decl
)
15755 /* Move lastprivate (decl) clause to OMP_FOR_CLAUSES. */
15757 *pc
= OMP_CLAUSE_CHAIN (c
);
15758 OMP_CLAUSE_CHAIN (c
) = *clauses
;
15761 else if (OMP_CLAUSE_CODE (*pc
) == OMP_CLAUSE_FIRSTPRIVATE
15762 && OMP_CLAUSE_DECL (*pc
) == decl
)
15764 error ("iteration variable %qD should not be firstprivate",
15766 *pc
= OMP_CLAUSE_CHAIN (*pc
);
15768 else if (OMP_CLAUSE_CODE (*pc
) == OMP_CLAUSE_REDUCTION
15769 && OMP_CLAUSE_DECL (*pc
) == decl
)
15771 error ("iteration variable %qD should not be reduction",
15773 *pc
= OMP_CLAUSE_CHAIN (*pc
);
15776 pc
= &OMP_CLAUSE_CHAIN (*pc
);
15781 if (*pc
== NULL_TREE
)
15783 tree c
= build_omp_clause (input_location
, OMP_CLAUSE_PRIVATE
);
15784 OMP_CLAUSE_DECL (c
) = decl
;
15785 c
= finish_omp_clauses (c
, C_ORT_OMP
);
15788 OMP_CLAUSE_CHAIN (c
) = *clauses
;
15793 cond
= TREE_VEC_ELT (OMP_FOR_COND (t
), i
);
15794 if (COMPARISON_CLASS_P (cond
))
15796 tree op0
= RECUR (TREE_OPERAND (cond
, 0));
15797 tree op1
= RECUR (TREE_OPERAND (cond
, 1));
15798 cond
= build2 (TREE_CODE (cond
), boolean_type_node
, op0
, op1
);
15801 cond
= RECUR (cond
);
15802 incr
= TREE_VEC_ELT (OMP_FOR_INCR (t
), i
);
15803 switch (TREE_CODE (incr
))
15805 case PREINCREMENT_EXPR
:
15806 case PREDECREMENT_EXPR
:
15807 case POSTINCREMENT_EXPR
:
15808 case POSTDECREMENT_EXPR
:
15809 incr
= build2 (TREE_CODE (incr
), TREE_TYPE (decl
),
15810 RECUR (TREE_OPERAND (incr
, 0)), NULL_TREE
);
15813 if (TREE_CODE (TREE_OPERAND (incr
, 1)) == PLUS_EXPR
15814 || TREE_CODE (TREE_OPERAND (incr
, 1)) == MINUS_EXPR
)
15816 tree rhs
= TREE_OPERAND (incr
, 1);
15817 tree lhs
= RECUR (TREE_OPERAND (incr
, 0));
15818 tree rhs0
= RECUR (TREE_OPERAND (rhs
, 0));
15819 tree rhs1
= RECUR (TREE_OPERAND (rhs
, 1));
15820 incr
= build2 (MODIFY_EXPR
, TREE_TYPE (decl
), lhs
,
15821 build2 (TREE_CODE (rhs
), TREE_TYPE (decl
),
15825 incr
= RECUR (incr
);
15828 if (TREE_CODE (TREE_OPERAND (incr
, 1)) == PLUS_EXPR
15829 || TREE_CODE (TREE_OPERAND (incr
, 1)) == MINUS_EXPR
)
15831 tree lhs
= RECUR (TREE_OPERAND (incr
, 0));
15832 incr
= build2 (MODIFY_EXPR
, TREE_TYPE (decl
), lhs
,
15833 build2 (TREE_CODE (TREE_OPERAND (incr
, 1)),
15834 TREE_TYPE (decl
), lhs
,
15835 RECUR (TREE_OPERAND (incr
, 2))));
15837 else if (TREE_CODE (TREE_OPERAND (incr
, 1)) == NOP_EXPR
15838 && (TREE_CODE (TREE_OPERAND (incr
, 2)) == PLUS_EXPR
15839 || (TREE_CODE (TREE_OPERAND (incr
, 2)) == MINUS_EXPR
)))
15841 tree rhs
= TREE_OPERAND (incr
, 2);
15842 tree lhs
= RECUR (TREE_OPERAND (incr
, 0));
15843 tree rhs0
= RECUR (TREE_OPERAND (rhs
, 0));
15844 tree rhs1
= RECUR (TREE_OPERAND (rhs
, 1));
15845 incr
= build2 (MODIFY_EXPR
, TREE_TYPE (decl
), lhs
,
15846 build2 (TREE_CODE (rhs
), TREE_TYPE (decl
),
15850 incr
= RECUR (incr
);
15853 incr
= RECUR (incr
);
15857 TREE_VEC_ELT (declv
, i
) = decl
;
15858 TREE_VEC_ELT (initv
, i
) = init
;
15859 TREE_VEC_ELT (condv
, i
) = cond
;
15860 TREE_VEC_ELT (incrv
, i
) = incr
;
15864 /* Helper function of tsubst_expr, find OMP_TEAMS inside
15865 of OMP_TARGET's body. */
15868 tsubst_find_omp_teams (tree
*tp
, int *walk_subtrees
, void *)
15870 *walk_subtrees
= 0;
15871 switch (TREE_CODE (*tp
))
15876 case STATEMENT_LIST
:
15877 *walk_subtrees
= 1;
15885 /* Helper function for tsubst_expr. For decomposition declaration
15886 artificial base DECL, which is tsubsted PATTERN_DECL, tsubst
15887 also the corresponding decls representing the identifiers
15888 of the decomposition declaration. Return DECL if successful
15889 or error_mark_node otherwise, set *FIRST to the first decl
15890 in the list chained through DECL_CHAIN and *CNT to the number
15894 tsubst_decomp_names (tree decl
, tree pattern_decl
, tree args
,
15895 tsubst_flags_t complain
, tree in_decl
, tree
*first
,
15898 tree decl2
, decl3
, prev
= decl
;
15900 gcc_assert (DECL_NAME (decl
) == NULL_TREE
);
15901 for (decl2
= DECL_CHAIN (pattern_decl
);
15904 && DECL_DECOMPOSITION_P (decl2
)
15905 && DECL_NAME (decl2
);
15906 decl2
= DECL_CHAIN (decl2
))
15908 if (TREE_TYPE (decl2
) == error_mark_node
&& *cnt
== 0)
15910 gcc_assert (errorcount
);
15911 return error_mark_node
;
15914 gcc_assert (DECL_DECOMP_BASE (decl2
) == pattern_decl
);
15915 gcc_assert (DECL_HAS_VALUE_EXPR_P (decl2
));
15916 tree v
= DECL_VALUE_EXPR (decl2
);
15917 DECL_HAS_VALUE_EXPR_P (decl2
) = 0;
15918 SET_DECL_VALUE_EXPR (decl2
, NULL_TREE
);
15919 decl3
= tsubst (decl2
, args
, complain
, in_decl
);
15920 SET_DECL_VALUE_EXPR (decl2
, v
);
15921 DECL_HAS_VALUE_EXPR_P (decl2
) = 1;
15923 DECL_TEMPLATE_INSTANTIATED (decl3
) = 1;
15924 maybe_push_decl (decl3
);
15925 if (error_operand_p (decl3
))
15926 decl
= error_mark_node
;
15927 else if (decl
!= error_mark_node
15928 && DECL_CHAIN (decl3
) != prev
)
15930 gcc_assert (errorcount
);
15931 decl
= error_mark_node
;
15940 /* Like tsubst_copy for expressions, etc. but also does semantic
15944 tsubst_expr (tree t
, tree args
, tsubst_flags_t complain
, tree in_decl
,
15945 bool integral_constant_expression_p
)
15947 #define RETURN(EXP) do { r = (EXP); goto out; } while(0)
15948 #define RECUR(NODE) \
15949 tsubst_expr ((NODE), args, complain, in_decl, \
15950 integral_constant_expression_p)
15956 if (t
== NULL_TREE
|| t
== error_mark_node
)
15959 loc
= input_location
;
15960 if (EXPR_HAS_LOCATION (t
))
15961 input_location
= EXPR_LOCATION (t
);
15962 if (STATEMENT_CODE_P (TREE_CODE (t
)))
15963 current_stmt_tree ()->stmts_are_full_exprs_p
= STMT_IS_FULL_EXPR_P (t
);
15965 switch (TREE_CODE (t
))
15967 case STATEMENT_LIST
:
15969 tree_stmt_iterator i
;
15970 for (i
= tsi_start (t
); !tsi_end_p (i
); tsi_next (&i
))
15971 RECUR (tsi_stmt (i
));
15975 case CTOR_INITIALIZER
:
15976 finish_mem_initializers (tsubst_initializer_list
15977 (TREE_OPERAND (t
, 0), args
));
15981 finish_return_stmt (RECUR (TREE_OPERAND (t
, 0)));
15985 tmp
= RECUR (EXPR_STMT_EXPR (t
));
15986 if (EXPR_STMT_STMT_EXPR_RESULT (t
))
15987 finish_stmt_expr_expr (tmp
, cur_stmt_expr
);
15989 finish_expr_stmt (tmp
);
15993 finish_local_using_directive (USING_STMT_NAMESPACE (t
),
15994 /*attribs=*/NULL_TREE
);
15999 tree decl
, pattern_decl
;
16002 pattern_decl
= decl
= DECL_EXPR_DECL (t
);
16003 if (TREE_CODE (decl
) == LABEL_DECL
)
16004 finish_label_decl (DECL_NAME (decl
));
16005 else if (TREE_CODE (decl
) == USING_DECL
)
16007 tree scope
= USING_DECL_SCOPE (decl
);
16008 tree name
= DECL_NAME (decl
);
16010 scope
= tsubst (scope
, args
, complain
, in_decl
);
16011 decl
= lookup_qualified_name (scope
, name
,
16012 /*is_type_p=*/false,
16013 /*complain=*/false);
16014 if (decl
== error_mark_node
|| TREE_CODE (decl
) == TREE_LIST
)
16015 qualified_name_lookup_error (scope
, name
, decl
, input_location
);
16017 finish_local_using_decl (decl
, scope
, name
);
16019 else if (DECL_PACK_P (decl
))
16021 /* Don't build up decls for a variadic capture proxy, we'll
16022 instantiate the elements directly as needed. */
16025 else if (is_capture_proxy (decl
)
16026 && !DECL_TEMPLATE_INSTANTIATION (current_function_decl
))
16028 /* We're in tsubst_lambda_expr, we've already inserted a new
16029 capture proxy, so look it up and register it. */
16030 tree inst
= lookup_name_real (DECL_NAME (decl
), 0, 0,
16031 /*block_p=*/true, 0, LOOKUP_HIDDEN
);
16032 gcc_assert (inst
!= decl
&& is_capture_proxy (inst
));
16033 register_local_specialization (inst
, decl
);
16036 else if (DECL_IMPLICIT_TYPEDEF_P (decl
)
16037 && LAMBDA_TYPE_P (TREE_TYPE (decl
)))
16038 /* Don't copy the old closure; we'll create a new one in
16039 tsubst_lambda_expr. */
16043 init
= DECL_INITIAL (decl
);
16044 decl
= tsubst (decl
, args
, complain
, in_decl
);
16045 if (decl
!= error_mark_node
)
16047 /* By marking the declaration as instantiated, we avoid
16048 trying to instantiate it. Since instantiate_decl can't
16049 handle local variables, and since we've already done
16050 all that needs to be done, that's the right thing to
16053 DECL_TEMPLATE_INSTANTIATED (decl
) = 1;
16055 && ANON_AGGR_TYPE_P (TREE_TYPE (decl
)))
16056 /* Anonymous aggregates are a special case. */
16057 finish_anon_union (decl
);
16058 else if (is_capture_proxy (DECL_EXPR_DECL (t
)))
16060 DECL_CONTEXT (decl
) = current_function_decl
;
16061 if (DECL_NAME (decl
) == this_identifier
)
16063 tree lam
= DECL_CONTEXT (current_function_decl
);
16064 lam
= CLASSTYPE_LAMBDA_EXPR (lam
);
16065 LAMBDA_EXPR_THIS_CAPTURE (lam
) = decl
;
16067 insert_capture_proxy (decl
);
16069 else if (DECL_IMPLICIT_TYPEDEF_P (t
))
16070 /* We already did a pushtag. */;
16071 else if (TREE_CODE (decl
) == FUNCTION_DECL
16072 && DECL_OMP_DECLARE_REDUCTION_P (decl
)
16073 && DECL_FUNCTION_SCOPE_P (pattern_decl
))
16075 DECL_CONTEXT (decl
) = NULL_TREE
;
16077 DECL_CONTEXT (decl
) = current_function_decl
;
16078 cp_check_omp_declare_reduction (decl
);
16082 int const_init
= false;
16083 maybe_push_decl (decl
);
16085 && DECL_PRETTY_FUNCTION_P (decl
))
16087 /* For __PRETTY_FUNCTION__ we have to adjust the
16089 const char *const name
16090 = cxx_printable_name (current_function_decl
, 2);
16091 init
= cp_fname_init (name
, &TREE_TYPE (decl
));
16094 init
= tsubst_init (init
, decl
, args
, complain
, in_decl
);
16097 const_init
= (DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P
16099 cp_finish_decl (decl
, init
, const_init
, NULL_TREE
, 0);
16101 && DECL_DECOMPOSITION_P (decl
)
16102 && TREE_TYPE (pattern_decl
) != error_mark_node
)
16106 decl
= tsubst_decomp_names (decl
, pattern_decl
, args
,
16107 complain
, in_decl
, &first
,
16109 if (decl
!= error_mark_node
)
16110 cp_finish_decomp (decl
, first
, cnt
);
16120 stmt
= begin_for_stmt (NULL_TREE
, NULL_TREE
);
16121 RECUR (FOR_INIT_STMT (t
));
16122 finish_init_stmt (stmt
);
16123 tmp
= RECUR (FOR_COND (t
));
16124 finish_for_cond (tmp
, stmt
, false);
16125 tmp
= RECUR (FOR_EXPR (t
));
16126 finish_for_expr (tmp
, stmt
);
16127 RECUR (FOR_BODY (t
));
16128 finish_for_stmt (stmt
);
16131 case RANGE_FOR_STMT
:
16134 stmt
= begin_for_stmt (NULL_TREE
, NULL_TREE
);
16135 decl
= RANGE_FOR_DECL (t
);
16136 decl
= tsubst (decl
, args
, complain
, in_decl
);
16137 maybe_push_decl (decl
);
16138 expr
= RECUR (RANGE_FOR_EXPR (t
));
16139 if (VAR_P (decl
) && DECL_DECOMPOSITION_P (decl
))
16143 decl
= tsubst_decomp_names (decl
, RANGE_FOR_DECL (t
), args
,
16144 complain
, in_decl
, &first
, &cnt
);
16145 stmt
= cp_convert_range_for (stmt
, decl
, expr
, first
, cnt
,
16146 RANGE_FOR_IVDEP (t
));
16149 stmt
= cp_convert_range_for (stmt
, decl
, expr
, NULL_TREE
, 0,
16150 RANGE_FOR_IVDEP (t
));
16151 RECUR (RANGE_FOR_BODY (t
));
16152 finish_for_stmt (stmt
);
16157 stmt
= begin_while_stmt ();
16158 tmp
= RECUR (WHILE_COND (t
));
16159 finish_while_stmt_cond (tmp
, stmt
, false);
16160 RECUR (WHILE_BODY (t
));
16161 finish_while_stmt (stmt
);
16165 stmt
= begin_do_stmt ();
16166 RECUR (DO_BODY (t
));
16167 finish_do_body (stmt
);
16168 tmp
= RECUR (DO_COND (t
));
16169 finish_do_stmt (tmp
, stmt
, false);
16173 stmt
= begin_if_stmt ();
16174 IF_STMT_CONSTEXPR_P (stmt
) = IF_STMT_CONSTEXPR_P (t
);
16175 tmp
= RECUR (IF_COND (t
));
16176 tmp
= finish_if_stmt_cond (tmp
, stmt
);
16177 if (IF_STMT_CONSTEXPR_P (t
) && integer_zerop (tmp
))
16178 /* Don't instantiate the THEN_CLAUSE. */;
16181 bool inhibit
= integer_zerop (fold_non_dependent_expr (tmp
));
16183 ++c_inhibit_evaluation_warnings
;
16184 RECUR (THEN_CLAUSE (t
));
16186 --c_inhibit_evaluation_warnings
;
16188 finish_then_clause (stmt
);
16190 if (IF_STMT_CONSTEXPR_P (t
) && integer_nonzerop (tmp
))
16191 /* Don't instantiate the ELSE_CLAUSE. */;
16192 else if (ELSE_CLAUSE (t
))
16194 bool inhibit
= integer_nonzerop (fold_non_dependent_expr (tmp
));
16195 begin_else_clause (stmt
);
16197 ++c_inhibit_evaluation_warnings
;
16198 RECUR (ELSE_CLAUSE (t
));
16200 --c_inhibit_evaluation_warnings
;
16201 finish_else_clause (stmt
);
16204 finish_if_stmt (stmt
);
16208 if (BIND_EXPR_BODY_BLOCK (t
))
16209 stmt
= begin_function_body ();
16211 stmt
= begin_compound_stmt (BIND_EXPR_TRY_BLOCK (t
)
16212 ? BCS_TRY_BLOCK
: 0);
16214 RECUR (BIND_EXPR_BODY (t
));
16216 if (BIND_EXPR_BODY_BLOCK (t
))
16217 finish_function_body (stmt
);
16219 finish_compound_stmt (stmt
);
16223 finish_break_stmt ();
16226 case CONTINUE_STMT
:
16227 finish_continue_stmt ();
16231 stmt
= begin_switch_stmt ();
16232 tmp
= RECUR (SWITCH_STMT_COND (t
));
16233 finish_switch_cond (tmp
, stmt
);
16234 RECUR (SWITCH_STMT_BODY (t
));
16235 finish_switch_stmt (stmt
);
16238 case CASE_LABEL_EXPR
:
16240 tree low
= RECUR (CASE_LOW (t
));
16241 tree high
= RECUR (CASE_HIGH (t
));
16242 tree l
= finish_case_label (EXPR_LOCATION (t
), low
, high
);
16243 if (l
&& TREE_CODE (l
) == CASE_LABEL_EXPR
)
16244 FALLTHROUGH_LABEL_P (CASE_LABEL (l
))
16245 = FALLTHROUGH_LABEL_P (CASE_LABEL (t
));
16251 tree decl
= LABEL_EXPR_LABEL (t
);
16254 label
= finish_label_stmt (DECL_NAME (decl
));
16255 if (TREE_CODE (label
) == LABEL_DECL
)
16256 FALLTHROUGH_LABEL_P (label
) = FALLTHROUGH_LABEL_P (decl
);
16257 if (DECL_ATTRIBUTES (decl
) != NULL_TREE
)
16258 cplus_decl_attributes (&label
, DECL_ATTRIBUTES (decl
), 0);
16263 tmp
= GOTO_DESTINATION (t
);
16264 if (TREE_CODE (tmp
) != LABEL_DECL
)
16265 /* Computed goto's must be tsubst'd into. On the other hand,
16266 non-computed gotos must not be; the identifier in question
16267 will have no binding. */
16270 tmp
= DECL_NAME (tmp
);
16271 finish_goto_stmt (tmp
);
16276 tree string
= RECUR (ASM_STRING (t
));
16277 tree outputs
= tsubst_copy_asm_operands (ASM_OUTPUTS (t
), args
,
16278 complain
, in_decl
);
16279 tree inputs
= tsubst_copy_asm_operands (ASM_INPUTS (t
), args
,
16280 complain
, in_decl
);
16281 tree clobbers
= tsubst_copy_asm_operands (ASM_CLOBBERS (t
), args
,
16282 complain
, in_decl
);
16283 tree labels
= tsubst_copy_asm_operands (ASM_LABELS (t
), args
,
16284 complain
, in_decl
);
16285 tmp
= finish_asm_stmt (ASM_VOLATILE_P (t
), string
, outputs
, inputs
,
16287 tree asm_expr
= tmp
;
16288 if (TREE_CODE (asm_expr
) == CLEANUP_POINT_EXPR
)
16289 asm_expr
= TREE_OPERAND (asm_expr
, 0);
16290 ASM_INPUT_P (asm_expr
) = ASM_INPUT_P (t
);
16297 stmt
= begin_try_block ();
16298 RECUR (TRY_STMTS (t
));
16299 finish_cleanup_try_block (stmt
);
16300 finish_cleanup (RECUR (TRY_HANDLERS (t
)), stmt
);
16304 tree compound_stmt
= NULL_TREE
;
16306 if (FN_TRY_BLOCK_P (t
))
16307 stmt
= begin_function_try_block (&compound_stmt
);
16309 stmt
= begin_try_block ();
16311 RECUR (TRY_STMTS (t
));
16313 if (FN_TRY_BLOCK_P (t
))
16314 finish_function_try_block (stmt
);
16316 finish_try_block (stmt
);
16318 RECUR (TRY_HANDLERS (t
));
16319 if (FN_TRY_BLOCK_P (t
))
16320 finish_function_handler_sequence (stmt
, compound_stmt
);
16322 finish_handler_sequence (stmt
);
16328 tree decl
= HANDLER_PARMS (t
);
16332 decl
= tsubst (decl
, args
, complain
, in_decl
);
16333 /* Prevent instantiate_decl from trying to instantiate
16334 this variable. We've already done all that needs to be
16336 if (decl
!= error_mark_node
)
16337 DECL_TEMPLATE_INSTANTIATED (decl
) = 1;
16339 stmt
= begin_handler ();
16340 finish_handler_parms (decl
, stmt
);
16341 RECUR (HANDLER_BODY (t
));
16342 finish_handler (stmt
);
16347 tmp
= tsubst (TREE_TYPE (t
), args
, complain
, NULL_TREE
);
16348 if (CLASS_TYPE_P (tmp
))
16350 /* Local classes are not independent templates; they are
16351 instantiated along with their containing function. And this
16352 way we don't have to deal with pushing out of one local class
16353 to instantiate a member of another local class. */
16354 /* Closures are handled by the LAMBDA_EXPR. */
16355 gcc_assert (!LAMBDA_TYPE_P (TREE_TYPE (t
)));
16356 complete_type (tmp
);
16357 for (tree fld
= TYPE_FIELDS (tmp
); fld
; fld
= DECL_CHAIN (fld
))
16359 || (TREE_CODE (fld
) == FUNCTION_DECL
16360 && !DECL_ARTIFICIAL (fld
)))
16361 && DECL_TEMPLATE_INSTANTIATION (fld
))
16362 instantiate_decl (fld
, /*defer_ok=*/false,
16363 /*expl_inst_class=*/false);
16367 case STATIC_ASSERT
:
16371 ++c_inhibit_evaluation_warnings
;
16373 tsubst_expr (STATIC_ASSERT_CONDITION (t
),
16376 /*integral_constant_expression_p=*/true);
16377 --c_inhibit_evaluation_warnings
;
16379 finish_static_assert (condition
,
16380 STATIC_ASSERT_MESSAGE (t
),
16381 STATIC_ASSERT_SOURCE_LOCATION (t
),
16382 /*member_p=*/false);
16387 case OACC_PARALLEL
:
16388 tmp
= tsubst_omp_clauses (OMP_CLAUSES (t
), C_ORT_ACC
, args
, complain
,
16390 stmt
= begin_omp_parallel ();
16391 RECUR (OMP_BODY (t
));
16392 finish_omp_construct (TREE_CODE (t
), stmt
, tmp
);
16396 r
= push_omp_privatization_clauses (OMP_PARALLEL_COMBINED (t
));
16397 tmp
= tsubst_omp_clauses (OMP_PARALLEL_CLAUSES (t
), C_ORT_OMP
, args
,
16398 complain
, in_decl
);
16399 if (OMP_PARALLEL_COMBINED (t
))
16400 omp_parallel_combined_clauses
= &tmp
;
16401 stmt
= begin_omp_parallel ();
16402 RECUR (OMP_PARALLEL_BODY (t
));
16403 gcc_assert (omp_parallel_combined_clauses
== NULL
);
16404 OMP_PARALLEL_COMBINED (finish_omp_parallel (tmp
, stmt
))
16405 = OMP_PARALLEL_COMBINED (t
);
16406 pop_omp_privatization_clauses (r
);
16410 r
= push_omp_privatization_clauses (false);
16411 tmp
= tsubst_omp_clauses (OMP_TASK_CLAUSES (t
), C_ORT_OMP
, args
,
16412 complain
, in_decl
);
16413 stmt
= begin_omp_task ();
16414 RECUR (OMP_TASK_BODY (t
));
16415 finish_omp_task (tmp
, stmt
);
16416 pop_omp_privatization_clauses (r
);
16423 case OMP_DISTRIBUTE
:
16427 tree clauses
, body
, pre_body
;
16428 tree declv
= NULL_TREE
, initv
= NULL_TREE
, condv
= NULL_TREE
;
16429 tree orig_declv
= NULL_TREE
;
16430 tree incrv
= NULL_TREE
;
16431 enum c_omp_region_type ort
= C_ORT_OMP
;
16434 if (TREE_CODE (t
) == CILK_SIMD
|| TREE_CODE (t
) == CILK_FOR
)
16436 else if (TREE_CODE (t
) == OACC_LOOP
)
16439 r
= push_omp_privatization_clauses (OMP_FOR_INIT (t
) == NULL_TREE
);
16440 clauses
= tsubst_omp_clauses (OMP_FOR_CLAUSES (t
), ort
, args
, complain
,
16442 if (OMP_FOR_INIT (t
) != NULL_TREE
)
16444 declv
= make_tree_vec (TREE_VEC_LENGTH (OMP_FOR_INIT (t
)));
16445 if (OMP_FOR_ORIG_DECLS (t
))
16446 orig_declv
= make_tree_vec (TREE_VEC_LENGTH (OMP_FOR_INIT (t
)));
16447 initv
= make_tree_vec (TREE_VEC_LENGTH (OMP_FOR_INIT (t
)));
16448 condv
= make_tree_vec (TREE_VEC_LENGTH (OMP_FOR_INIT (t
)));
16449 incrv
= make_tree_vec (TREE_VEC_LENGTH (OMP_FOR_INIT (t
)));
16452 stmt
= begin_omp_structured_block ();
16454 pre_body
= push_stmt_list ();
16455 RECUR (OMP_FOR_PRE_BODY (t
));
16456 pre_body
= pop_stmt_list (pre_body
);
16458 if (OMP_FOR_INIT (t
) != NULL_TREE
)
16459 for (i
= 0; i
< TREE_VEC_LENGTH (OMP_FOR_INIT (t
)); i
++)
16460 tsubst_omp_for_iterator (t
, i
, declv
, orig_declv
, initv
, condv
,
16461 incrv
, &clauses
, args
, complain
, in_decl
,
16462 integral_constant_expression_p
);
16463 omp_parallel_combined_clauses
= NULL
;
16465 body
= push_stmt_list ();
16466 RECUR (OMP_FOR_BODY (t
));
16467 body
= pop_stmt_list (body
);
16469 if (OMP_FOR_INIT (t
) != NULL_TREE
)
16470 t
= finish_omp_for (EXPR_LOCATION (t
), TREE_CODE (t
), declv
,
16471 orig_declv
, initv
, condv
, incrv
, body
, pre_body
,
16475 t
= make_node (TREE_CODE (t
));
16476 TREE_TYPE (t
) = void_type_node
;
16477 OMP_FOR_BODY (t
) = body
;
16478 OMP_FOR_PRE_BODY (t
) = pre_body
;
16479 OMP_FOR_CLAUSES (t
) = clauses
;
16480 SET_EXPR_LOCATION (t
, EXPR_LOCATION (t
));
16484 add_stmt (finish_omp_structured_block (stmt
));
16485 pop_omp_privatization_clauses (r
);
16490 omp_parallel_combined_clauses
= NULL
;
16495 r
= push_omp_privatization_clauses (TREE_CODE (t
) == OMP_TEAMS
16496 && OMP_TEAMS_COMBINED (t
));
16497 tmp
= tsubst_omp_clauses (OMP_CLAUSES (t
), C_ORT_OMP
, args
, complain
,
16499 stmt
= push_stmt_list ();
16500 RECUR (OMP_BODY (t
));
16501 stmt
= pop_stmt_list (stmt
);
16504 OMP_BODY (t
) = stmt
;
16505 OMP_CLAUSES (t
) = tmp
;
16507 pop_omp_privatization_clauses (r
);
16511 case OMP_TARGET_DATA
:
16513 tmp
= tsubst_omp_clauses (OMP_CLAUSES (t
), (TREE_CODE (t
) == OACC_DATA
)
16514 ? C_ORT_ACC
: C_ORT_OMP
, args
, complain
,
16516 keep_next_level (true);
16517 stmt
= begin_omp_structured_block ();
16519 RECUR (OMP_BODY (t
));
16520 stmt
= finish_omp_structured_block (stmt
);
16523 OMP_BODY (t
) = stmt
;
16524 OMP_CLAUSES (t
) = tmp
;
16525 if (TREE_CODE (t
) == OMP_TARGET
&& OMP_TARGET_COMBINED (t
))
16527 tree teams
= cp_walk_tree (&stmt
, tsubst_find_omp_teams
, NULL
, NULL
);
16530 /* For combined target teams, ensure the num_teams and
16531 thread_limit clause expressions are evaluated on the host,
16532 before entering the target construct. */
16534 for (c
= OMP_TEAMS_CLAUSES (teams
);
16535 c
; c
= OMP_CLAUSE_CHAIN (c
))
16536 if ((OMP_CLAUSE_CODE (c
) == OMP_CLAUSE_NUM_TEAMS
16537 || OMP_CLAUSE_CODE (c
) == OMP_CLAUSE_THREAD_LIMIT
)
16538 && TREE_CODE (OMP_CLAUSE_OPERAND (c
, 0)) != INTEGER_CST
)
16540 tree expr
= OMP_CLAUSE_OPERAND (c
, 0);
16541 expr
= force_target_expr (TREE_TYPE (expr
), expr
, tf_none
);
16542 if (expr
== error_mark_node
)
16544 tmp
= TARGET_EXPR_SLOT (expr
);
16546 OMP_CLAUSE_OPERAND (c
, 0) = expr
;
16547 tree tc
= build_omp_clause (OMP_CLAUSE_LOCATION (c
),
16548 OMP_CLAUSE_FIRSTPRIVATE
);
16549 OMP_CLAUSE_DECL (tc
) = tmp
;
16550 OMP_CLAUSE_CHAIN (tc
) = OMP_TARGET_CLAUSES (t
);
16551 OMP_TARGET_CLAUSES (t
) = tc
;
16560 tmp
= tsubst_omp_clauses (OACC_DECLARE_CLAUSES (t
), C_ORT_ACC
, args
,
16561 complain
, in_decl
);
16562 OACC_DECLARE_CLAUSES (t
) = tmp
;
16566 case OMP_TARGET_UPDATE
:
16567 case OMP_TARGET_ENTER_DATA
:
16568 case OMP_TARGET_EXIT_DATA
:
16569 tmp
= tsubst_omp_clauses (OMP_STANDALONE_CLAUSES (t
), C_ORT_OMP
, args
,
16570 complain
, in_decl
);
16572 OMP_STANDALONE_CLAUSES (t
) = tmp
;
16576 case OACC_ENTER_DATA
:
16577 case OACC_EXIT_DATA
:
16579 tmp
= tsubst_omp_clauses (OMP_STANDALONE_CLAUSES (t
), C_ORT_ACC
, args
,
16580 complain
, in_decl
);
16582 OMP_STANDALONE_CLAUSES (t
) = tmp
;
16587 tmp
= tsubst_omp_clauses (OMP_ORDERED_CLAUSES (t
), C_ORT_OMP
, args
,
16588 complain
, in_decl
);
16589 stmt
= push_stmt_list ();
16590 RECUR (OMP_BODY (t
));
16591 stmt
= pop_stmt_list (stmt
);
16594 OMP_BODY (t
) = stmt
;
16595 OMP_ORDERED_CLAUSES (t
) = tmp
;
16601 case OMP_TASKGROUP
:
16602 stmt
= push_stmt_list ();
16603 RECUR (OMP_BODY (t
));
16604 stmt
= pop_stmt_list (stmt
);
16607 OMP_BODY (t
) = stmt
;
16612 gcc_assert (OMP_ATOMIC_DEPENDENT_P (t
));
16613 if (TREE_CODE (TREE_OPERAND (t
, 1)) != MODIFY_EXPR
)
16615 tree op1
= TREE_OPERAND (t
, 1);
16616 tree rhs1
= NULL_TREE
;
16618 if (TREE_CODE (op1
) == COMPOUND_EXPR
)
16620 rhs1
= RECUR (TREE_OPERAND (op1
, 0));
16621 op1
= TREE_OPERAND (op1
, 1);
16623 lhs
= RECUR (TREE_OPERAND (op1
, 0));
16624 rhs
= RECUR (TREE_OPERAND (op1
, 1));
16625 finish_omp_atomic (OMP_ATOMIC
, TREE_CODE (op1
), lhs
, rhs
,
16626 NULL_TREE
, NULL_TREE
, rhs1
,
16627 OMP_ATOMIC_SEQ_CST (t
));
16631 tree op1
= TREE_OPERAND (t
, 1);
16632 tree v
= NULL_TREE
, lhs
, rhs
= NULL_TREE
, lhs1
= NULL_TREE
;
16633 tree rhs1
= NULL_TREE
;
16634 enum tree_code code
= TREE_CODE (TREE_OPERAND (op1
, 1));
16635 enum tree_code opcode
= NOP_EXPR
;
16636 if (code
== OMP_ATOMIC_READ
)
16638 v
= RECUR (TREE_OPERAND (op1
, 0));
16639 lhs
= RECUR (TREE_OPERAND (TREE_OPERAND (op1
, 1), 0));
16641 else if (code
== OMP_ATOMIC_CAPTURE_OLD
16642 || code
== OMP_ATOMIC_CAPTURE_NEW
)
16644 tree op11
= TREE_OPERAND (TREE_OPERAND (op1
, 1), 1);
16645 v
= RECUR (TREE_OPERAND (op1
, 0));
16646 lhs1
= RECUR (TREE_OPERAND (TREE_OPERAND (op1
, 1), 0));
16647 if (TREE_CODE (op11
) == COMPOUND_EXPR
)
16649 rhs1
= RECUR (TREE_OPERAND (op11
, 0));
16650 op11
= TREE_OPERAND (op11
, 1);
16652 lhs
= RECUR (TREE_OPERAND (op11
, 0));
16653 rhs
= RECUR (TREE_OPERAND (op11
, 1));
16654 opcode
= TREE_CODE (op11
);
16655 if (opcode
== MODIFY_EXPR
)
16661 lhs
= RECUR (TREE_OPERAND (op1
, 0));
16662 rhs
= RECUR (TREE_OPERAND (op1
, 1));
16664 finish_omp_atomic (code
, opcode
, lhs
, rhs
, v
, lhs1
, rhs1
,
16665 OMP_ATOMIC_SEQ_CST (t
));
16669 case TRANSACTION_EXPR
:
16672 flags
|= (TRANSACTION_EXPR_OUTER (t
) ? TM_STMT_ATTR_OUTER
: 0);
16673 flags
|= (TRANSACTION_EXPR_RELAXED (t
) ? TM_STMT_ATTR_RELAXED
: 0);
16675 if (TRANSACTION_EXPR_IS_STMT (t
))
16677 tree body
= TRANSACTION_EXPR_BODY (t
);
16678 tree noex
= NULL_TREE
;
16679 if (TREE_CODE (body
) == MUST_NOT_THROW_EXPR
)
16681 noex
= MUST_NOT_THROW_COND (body
);
16682 if (noex
== NULL_TREE
)
16683 noex
= boolean_true_node
;
16684 body
= TREE_OPERAND (body
, 0);
16686 stmt
= begin_transaction_stmt (input_location
, NULL
, flags
);
16688 finish_transaction_stmt (stmt
, NULL
, flags
, RECUR (noex
));
16692 stmt
= build_transaction_expr (EXPR_LOCATION (t
),
16693 RECUR (TRANSACTION_EXPR_BODY (t
)),
16700 case MUST_NOT_THROW_EXPR
:
16702 tree op0
= RECUR (TREE_OPERAND (t
, 0));
16703 tree cond
= RECUR (MUST_NOT_THROW_COND (t
));
16704 RETURN (build_must_not_throw_expr (op0
, cond
));
16707 case EXPR_PACK_EXPANSION
:
16708 error ("invalid use of pack expansion expression");
16709 RETURN (error_mark_node
);
16711 case NONTYPE_ARGUMENT_PACK
:
16712 error ("use %<...%> to expand argument pack");
16713 RETURN (error_mark_node
);
16715 case CILK_SPAWN_STMT
:
16716 cfun
->calls_cilk_spawn
= 1;
16717 RETURN (build_cilk_spawn (EXPR_LOCATION (t
), RECUR (CILK_SPAWN_FN (t
))));
16719 case CILK_SYNC_STMT
:
16720 RETURN (build_cilk_sync ());
16722 case COMPOUND_EXPR
:
16723 tmp
= RECUR (TREE_OPERAND (t
, 0));
16724 if (tmp
== NULL_TREE
)
16725 /* If the first operand was a statement, we're done with it. */
16726 RETURN (RECUR (TREE_OPERAND (t
, 1)));
16727 RETURN (build_x_compound_expr (EXPR_LOCATION (t
), tmp
,
16728 RECUR (TREE_OPERAND (t
, 1)),
16731 case ANNOTATE_EXPR
:
16732 tmp
= RECUR (TREE_OPERAND (t
, 0));
16733 RETURN (build3_loc (EXPR_LOCATION (t
), ANNOTATE_EXPR
,
16734 TREE_TYPE (tmp
), tmp
,
16735 RECUR (TREE_OPERAND (t
, 1)),
16736 RECUR (TREE_OPERAND (t
, 2))));
16739 gcc_assert (!STATEMENT_CODE_P (TREE_CODE (t
)));
16741 RETURN (tsubst_copy_and_build (t
, args
, complain
, in_decl
,
16742 /*function_p=*/false,
16743 integral_constant_expression_p
));
16746 RETURN (NULL_TREE
);
16748 input_location
= loc
;
16754 /* Instantiate the special body of the artificial DECL_OMP_DECLARE_REDUCTION
16755 function. For description of the body see comment above
16756 cp_parser_omp_declare_reduction_exprs. */
16759 tsubst_omp_udr (tree t
, tree args
, tsubst_flags_t complain
, tree in_decl
)
16761 if (t
== NULL_TREE
|| t
== error_mark_node
)
16764 gcc_assert (TREE_CODE (t
) == STATEMENT_LIST
);
16766 tree_stmt_iterator tsi
;
16769 memset (stmts
, 0, sizeof stmts
);
16770 for (i
= 0, tsi
= tsi_start (t
);
16771 i
< 7 && !tsi_end_p (tsi
);
16772 i
++, tsi_next (&tsi
))
16773 stmts
[i
] = tsi_stmt (tsi
);
16774 gcc_assert (tsi_end_p (tsi
));
16778 gcc_assert (TREE_CODE (stmts
[0]) == DECL_EXPR
16779 && TREE_CODE (stmts
[1]) == DECL_EXPR
);
16780 tree omp_out
= tsubst (DECL_EXPR_DECL (stmts
[0]),
16781 args
, complain
, in_decl
);
16782 tree omp_in
= tsubst (DECL_EXPR_DECL (stmts
[1]),
16783 args
, complain
, in_decl
);
16784 DECL_CONTEXT (omp_out
) = current_function_decl
;
16785 DECL_CONTEXT (omp_in
) = current_function_decl
;
16786 keep_next_level (true);
16787 tree block
= begin_omp_structured_block ();
16788 tsubst_expr (stmts
[2], args
, complain
, in_decl
, false);
16789 block
= finish_omp_structured_block (block
);
16790 block
= maybe_cleanup_point_expr_void (block
);
16791 add_decl_expr (omp_out
);
16792 if (TREE_NO_WARNING (DECL_EXPR_DECL (stmts
[0])))
16793 TREE_NO_WARNING (omp_out
) = 1;
16794 add_decl_expr (omp_in
);
16795 finish_expr_stmt (block
);
16799 gcc_assert (TREE_CODE (stmts
[3]) == DECL_EXPR
16800 && TREE_CODE (stmts
[4]) == DECL_EXPR
);
16801 tree omp_priv
= tsubst (DECL_EXPR_DECL (stmts
[3]),
16802 args
, complain
, in_decl
);
16803 tree omp_orig
= tsubst (DECL_EXPR_DECL (stmts
[4]),
16804 args
, complain
, in_decl
);
16805 DECL_CONTEXT (omp_priv
) = current_function_decl
;
16806 DECL_CONTEXT (omp_orig
) = current_function_decl
;
16807 keep_next_level (true);
16808 tree block
= begin_omp_structured_block ();
16809 tsubst_expr (stmts
[5], args
, complain
, in_decl
, false);
16810 block
= finish_omp_structured_block (block
);
16811 block
= maybe_cleanup_point_expr_void (block
);
16812 cp_walk_tree (&block
, cp_remove_omp_priv_cleanup_stmt
, omp_priv
, NULL
);
16813 add_decl_expr (omp_priv
);
16814 add_decl_expr (omp_orig
);
16815 finish_expr_stmt (block
);
16817 add_decl_expr (omp_orig
);
16821 /* T is a postfix-expression that is not being used in a function
16822 call. Return the substituted version of T. */
16825 tsubst_non_call_postfix_expression (tree t
, tree args
,
16826 tsubst_flags_t complain
,
16829 if (TREE_CODE (t
) == SCOPE_REF
)
16830 t
= tsubst_qualified_id (t
, args
, complain
, in_decl
,
16831 /*done=*/false, /*address_p=*/false);
16833 t
= tsubst_copy_and_build (t
, args
, complain
, in_decl
,
16834 /*function_p=*/false,
16835 /*integral_constant_expression_p=*/false);
16840 /* T is a LAMBDA_EXPR. Generate a new LAMBDA_EXPR for the current
16841 instantiation context. Instantiating a pack expansion containing a lambda
16842 might result in multiple lambdas all based on the same lambda in the
16846 tsubst_lambda_expr (tree t
, tree args
, tsubst_flags_t complain
, tree in_decl
)
16848 tree oldfn
= lambda_function (t
);
16851 tree r
= build_lambda_expr ();
16853 LAMBDA_EXPR_LOCATION (r
)
16854 = LAMBDA_EXPR_LOCATION (t
);
16855 LAMBDA_EXPR_DEFAULT_CAPTURE_MODE (r
)
16856 = LAMBDA_EXPR_DEFAULT_CAPTURE_MODE (t
);
16857 LAMBDA_EXPR_MUTABLE_P (r
) = LAMBDA_EXPR_MUTABLE_P (t
);
16859 if (LAMBDA_EXPR_EXTRA_SCOPE (t
) == NULL_TREE
)
16860 LAMBDA_EXPR_EXTRA_SCOPE (r
) = NULL_TREE
;
16862 record_lambda_scope (r
);
16864 gcc_assert (LAMBDA_EXPR_THIS_CAPTURE (t
) == NULL_TREE
16865 && LAMBDA_EXPR_PENDING_PROXIES (t
) == NULL
);
16867 for (tree cap
= LAMBDA_EXPR_CAPTURE_LIST (t
); cap
;
16868 cap
= TREE_CHAIN (cap
))
16870 tree field
= TREE_PURPOSE (cap
);
16871 if (PACK_EXPANSION_P (field
))
16872 field
= PACK_EXPANSION_PATTERN (field
);
16873 field
= tsubst_decl (field
, args
, complain
);
16875 if (field
== error_mark_node
)
16876 return error_mark_node
;
16878 tree init
= TREE_VALUE (cap
);
16879 if (PACK_EXPANSION_P (init
))
16880 init
= tsubst_pack_expansion (init
, args
, complain
, in_decl
);
16882 init
= tsubst_copy_and_build (init
, args
, complain
, in_decl
,
16883 /*fn*/false, /*constexpr*/false);
16885 if (TREE_CODE (field
) == TREE_VEC
)
16887 int len
= TREE_VEC_LENGTH (field
);
16888 gcc_assert (TREE_CODE (init
) == TREE_VEC
16889 && TREE_VEC_LENGTH (init
) == len
);
16890 for (int i
= 0; i
< len
; ++i
)
16891 LAMBDA_EXPR_CAPTURE_LIST (r
)
16892 = tree_cons (TREE_VEC_ELT (field
, i
),
16893 TREE_VEC_ELT (init
, i
),
16894 LAMBDA_EXPR_CAPTURE_LIST (r
));
16898 LAMBDA_EXPR_CAPTURE_LIST (r
)
16899 = tree_cons (field
, init
, LAMBDA_EXPR_CAPTURE_LIST (r
));
16901 if (id_equal (DECL_NAME (field
), "__this"))
16902 LAMBDA_EXPR_THIS_CAPTURE (r
) = field
;
16906 tree type
= begin_lambda_type (r
);
16908 /* Do this again now that LAMBDA_EXPR_EXTRA_SCOPE is set. */
16909 determine_visibility (TYPE_NAME (type
));
16911 register_capture_members (LAMBDA_EXPR_CAPTURE_LIST (r
));
16913 tree oldtmpl
= (generic_lambda_fn_p (oldfn
)
16914 ? DECL_TI_TEMPLATE (oldfn
)
16917 tree fntype
= static_fn_type (oldfn
);
16919 ++processing_template_decl
;
16920 fntype
= tsubst (fntype
, args
, complain
, in_decl
);
16922 --processing_template_decl
;
16924 if (fntype
== error_mark_node
)
16925 r
= error_mark_node
;
16928 /* Fix the type of 'this'. */
16929 fntype
= build_memfn_type (fntype
, type
,
16930 type_memfn_quals (fntype
),
16931 type_memfn_rqual (fntype
));
16935 tmpl
= tsubst_template_decl (oldtmpl
, args
, complain
, fntype
);
16936 fn
= DECL_TEMPLATE_RESULT (tmpl
);
16937 finish_member_declaration (tmpl
);
16942 fn
= tsubst_function_decl (oldfn
, args
, complain
, fntype
);
16943 finish_member_declaration (fn
);
16946 /* Let finish_function set this. */
16947 DECL_DECLARED_CONSTEXPR_P (fn
) = false;
16949 bool nested
= cfun
;
16951 push_function_context ();
16953 local_specialization_stack
s (lss_copy
);
16955 tree body
= start_lambda_function (fn
, r
);
16957 register_parameter_specializations (oldfn
, fn
);
16959 tsubst_expr (DECL_SAVED_TREE (oldfn
), args
, complain
, r
,
16960 /*constexpr*/false);
16962 finish_lambda_function (body
);
16965 pop_function_context ();
16967 /* The capture list was built up in reverse order; fix that now. */
16968 LAMBDA_EXPR_CAPTURE_LIST (r
)
16969 = nreverse (LAMBDA_EXPR_CAPTURE_LIST (r
));
16971 LAMBDA_EXPR_THIS_CAPTURE (r
) = NULL_TREE
;
16973 maybe_add_lambda_conv_op (type
);
16976 finish_struct (type
, /*attr*/NULL_TREE
);
16978 insert_pending_capture_proxies ();
16983 /* Like tsubst but deals with expressions and performs semantic
16984 analysis. FUNCTION_P is true if T is the "F" in "F (ARGS)". */
16987 tsubst_copy_and_build (tree t
,
16989 tsubst_flags_t complain
,
16992 bool integral_constant_expression_p
)
16994 #define RETURN(EXP) do { retval = (EXP); goto out; } while(0)
16995 #define RECUR(NODE) \
16996 tsubst_copy_and_build (NODE, args, complain, in_decl, \
16997 /*function_p=*/false, \
16998 integral_constant_expression_p)
17003 if (t
== NULL_TREE
|| t
== error_mark_node
)
17006 loc
= input_location
;
17007 if (EXPR_HAS_LOCATION (t
))
17008 input_location
= EXPR_LOCATION (t
);
17010 /* N3276 decltype magic only applies to calls at the top level or on the
17011 right side of a comma. */
17012 tsubst_flags_t decltype_flag
= (complain
& tf_decltype
);
17013 complain
&= ~tf_decltype
;
17015 switch (TREE_CODE (t
))
17019 /* Fall through. */
17020 case IDENTIFIER_NODE
:
17024 bool non_integral_constant_expression_p
;
17025 const char *error_msg
;
17027 if (IDENTIFIER_CONV_OP_P (t
))
17029 tree new_type
= tsubst (TREE_TYPE (t
), args
, complain
, in_decl
);
17030 t
= make_conv_op_name (new_type
);
17033 /* Look up the name. */
17034 decl
= lookup_name (t
);
17036 /* By convention, expressions use ERROR_MARK_NODE to indicate
17037 failure, not NULL_TREE. */
17038 if (decl
== NULL_TREE
)
17039 decl
= error_mark_node
;
17041 decl
= finish_id_expression (t
, decl
, NULL_TREE
,
17043 integral_constant_expression_p
,
17044 /*allow_non_integral_constant_expression_p=*/(cxx_dialect
>= cxx11
),
17045 &non_integral_constant_expression_p
,
17046 /*template_p=*/false,
17048 /*address_p=*/false,
17049 /*template_arg_p=*/false,
17054 if (!function_p
&& identifier_p (decl
))
17056 if (complain
& tf_error
)
17057 unqualified_name_lookup_error (decl
);
17058 decl
= error_mark_node
;
17063 case TEMPLATE_ID_EXPR
:
17066 tree templ
= RECUR (TREE_OPERAND (t
, 0));
17067 tree targs
= TREE_OPERAND (t
, 1);
17070 targs
= tsubst_template_args (targs
, args
, complain
, in_decl
);
17071 if (targs
== error_mark_node
)
17072 return error_mark_node
;
17074 if (TREE_CODE (templ
) == SCOPE_REF
)
17076 tree name
= TREE_OPERAND (templ
, 1);
17077 tree tid
= lookup_template_function (name
, targs
);
17078 TREE_OPERAND (templ
, 1) = tid
;
17082 if (variable_template_p (templ
))
17083 RETURN (lookup_and_finish_template_variable (templ
, targs
, complain
));
17085 if (TREE_CODE (templ
) == COMPONENT_REF
)
17087 object
= TREE_OPERAND (templ
, 0);
17088 templ
= TREE_OPERAND (templ
, 1);
17091 object
= NULL_TREE
;
17092 templ
= lookup_template_function (templ
, targs
);
17095 RETURN (build3 (COMPONENT_REF
, TREE_TYPE (templ
),
17096 object
, templ
, NULL_TREE
));
17098 RETURN (baselink_for_fns (templ
));
17103 tree r
= RECUR (TREE_OPERAND (t
, 0));
17105 if (REFERENCE_REF_P (t
))
17107 /* A type conversion to reference type will be enclosed in
17108 such an indirect ref, but the substitution of the cast
17109 will have also added such an indirect ref. */
17110 r
= convert_from_reference (r
);
17113 r
= build_x_indirect_ref (input_location
, r
, RO_UNARY_STAR
,
17114 complain
|decltype_flag
);
17116 if (TREE_CODE (r
) == INDIRECT_REF
)
17117 REF_PARENTHESIZED_P (r
) = REF_PARENTHESIZED_P (t
);
17124 tree type
= tsubst (TREE_TYPE (t
), args
, complain
, in_decl
);
17125 tree op0
= RECUR (TREE_OPERAND (t
, 0));
17126 RETURN (build_nop (type
, op0
));
17129 case IMPLICIT_CONV_EXPR
:
17131 tree type
= tsubst (TREE_TYPE (t
), args
, complain
, in_decl
);
17132 tree expr
= RECUR (TREE_OPERAND (t
, 0));
17133 if (dependent_type_p (type
) || type_dependent_expression_p (expr
))
17135 retval
= copy_node (t
);
17136 TREE_TYPE (retval
) = type
;
17137 TREE_OPERAND (retval
, 0) = expr
;
17140 if (IMPLICIT_CONV_EXPR_NONTYPE_ARG (t
))
17141 /* We'll pass this to convert_nontype_argument again, we don't need
17142 to actually perform any conversion here. */
17144 int flags
= LOOKUP_IMPLICIT
;
17145 if (IMPLICIT_CONV_EXPR_DIRECT_INIT (t
))
17146 flags
= LOOKUP_NORMAL
;
17147 RETURN (perform_implicit_conversion_flags (type
, expr
, complain
,
17153 tree type
= tsubst (TREE_TYPE (t
), args
, complain
, in_decl
);
17154 tree op0
= RECUR (TREE_OPERAND (t
, 0));
17155 RETURN (build1 (CONVERT_EXPR
, type
, op0
));
17159 case REINTERPRET_CAST_EXPR
:
17160 case CONST_CAST_EXPR
:
17161 case DYNAMIC_CAST_EXPR
:
17162 case STATIC_CAST_EXPR
:
17165 tree op
, r
= NULL_TREE
;
17167 type
= tsubst (TREE_TYPE (t
), args
, complain
, in_decl
);
17168 if (integral_constant_expression_p
17169 && !cast_valid_in_integral_constant_expression_p (type
))
17171 if (complain
& tf_error
)
17172 error ("a cast to a type other than an integral or "
17173 "enumeration type cannot appear in a constant-expression");
17174 RETURN (error_mark_node
);
17177 op
= RECUR (TREE_OPERAND (t
, 0));
17179 warning_sentinel
s(warn_useless_cast
);
17180 switch (TREE_CODE (t
))
17183 r
= build_functional_cast (type
, op
, complain
);
17185 case REINTERPRET_CAST_EXPR
:
17186 r
= build_reinterpret_cast (type
, op
, complain
);
17188 case CONST_CAST_EXPR
:
17189 r
= build_const_cast (type
, op
, complain
);
17191 case DYNAMIC_CAST_EXPR
:
17192 r
= build_dynamic_cast (type
, op
, complain
);
17194 case STATIC_CAST_EXPR
:
17195 r
= build_static_cast (type
, op
, complain
);
17198 gcc_unreachable ();
17204 case POSTDECREMENT_EXPR
:
17205 case POSTINCREMENT_EXPR
:
17206 op1
= tsubst_non_call_postfix_expression (TREE_OPERAND (t
, 0),
17207 args
, complain
, in_decl
);
17208 RETURN (build_x_unary_op (input_location
, TREE_CODE (t
), op1
,
17209 complain
|decltype_flag
));
17211 case PREDECREMENT_EXPR
:
17212 case PREINCREMENT_EXPR
:
17216 case TRUTH_NOT_EXPR
:
17217 case UNARY_PLUS_EXPR
: /* Unary + */
17218 case REALPART_EXPR
:
17219 case IMAGPART_EXPR
:
17220 RETURN (build_x_unary_op (input_location
, TREE_CODE (t
),
17221 RECUR (TREE_OPERAND (t
, 0)),
17222 complain
|decltype_flag
));
17224 case FIX_TRUNC_EXPR
:
17225 RETURN (cp_build_unary_op (FIX_TRUNC_EXPR
, RECUR (TREE_OPERAND (t
, 0)),
17229 op1
= TREE_OPERAND (t
, 0);
17230 if (TREE_CODE (op1
) == LABEL_DECL
)
17231 RETURN (finish_label_address_expr (DECL_NAME (op1
),
17232 EXPR_LOCATION (op1
)));
17233 if (TREE_CODE (op1
) == SCOPE_REF
)
17234 op1
= tsubst_qualified_id (op1
, args
, complain
, in_decl
,
17235 /*done=*/true, /*address_p=*/true);
17237 op1
= tsubst_non_call_postfix_expression (op1
, args
, complain
,
17239 RETURN (build_x_unary_op (input_location
, ADDR_EXPR
, op1
,
17240 complain
|decltype_flag
));
17245 case TRUNC_DIV_EXPR
:
17246 case CEIL_DIV_EXPR
:
17247 case FLOOR_DIV_EXPR
:
17248 case ROUND_DIV_EXPR
:
17249 case EXACT_DIV_EXPR
:
17253 case TRUNC_MOD_EXPR
:
17254 case FLOOR_MOD_EXPR
:
17255 case TRUTH_ANDIF_EXPR
:
17256 case TRUTH_ORIF_EXPR
:
17257 case TRUTH_AND_EXPR
:
17258 case TRUTH_OR_EXPR
:
17274 warning_sentinel
s1(warn_type_limits
);
17275 warning_sentinel
s2(warn_div_by_zero
);
17276 warning_sentinel
s3(warn_logical_op
);
17277 warning_sentinel
s4(warn_tautological_compare
);
17278 tree op0
= RECUR (TREE_OPERAND (t
, 0));
17279 tree op1
= RECUR (TREE_OPERAND (t
, 1));
17280 tree r
= build_x_binary_op
17281 (input_location
, TREE_CODE (t
),
17283 (TREE_NO_WARNING (TREE_OPERAND (t
, 0))
17285 : TREE_CODE (TREE_OPERAND (t
, 0))),
17287 (TREE_NO_WARNING (TREE_OPERAND (t
, 1))
17289 : TREE_CODE (TREE_OPERAND (t
, 1))),
17291 complain
|decltype_flag
);
17292 if (EXPR_P (r
) && TREE_NO_WARNING (t
))
17293 TREE_NO_WARNING (r
) = TREE_NO_WARNING (t
);
17298 case POINTER_PLUS_EXPR
:
17300 tree op0
= RECUR (TREE_OPERAND (t
, 0));
17301 tree op1
= RECUR (TREE_OPERAND (t
, 1));
17302 return fold_build_pointer_plus (op0
, op1
);
17306 RETURN (tsubst_qualified_id (t
, args
, complain
, in_decl
, /*done=*/true,
17307 /*address_p=*/false));
17309 op1
= tsubst_non_call_postfix_expression (TREE_OPERAND (t
, 0),
17310 args
, complain
, in_decl
);
17311 RETURN (build_x_array_ref (EXPR_LOCATION (t
), op1
,
17312 RECUR (TREE_OPERAND (t
, 1)),
17313 complain
|decltype_flag
));
17315 case ARRAY_NOTATION_REF
:
17317 tree start_index
, length
, stride
;
17318 op1
= tsubst_non_call_postfix_expression (ARRAY_NOTATION_ARRAY (t
),
17319 args
, complain
, in_decl
);
17320 start_index
= RECUR (ARRAY_NOTATION_START (t
));
17321 length
= RECUR (ARRAY_NOTATION_LENGTH (t
));
17322 stride
= RECUR (ARRAY_NOTATION_STRIDE (t
));
17323 RETURN (build_array_notation_ref (EXPR_LOCATION (t
), op1
, start_index
,
17324 length
, stride
, TREE_TYPE (op1
)));
17327 if (PACK_EXPANSION_P (TREE_OPERAND (t
, 0))
17328 || ARGUMENT_PACK_P (TREE_OPERAND (t
, 0)))
17329 RETURN (tsubst_copy (t
, args
, complain
, in_decl
));
17336 op1
= TREE_OPERAND (t
, 0);
17337 if (TREE_CODE (t
) == SIZEOF_EXPR
&& SIZEOF_EXPR_TYPE_P (t
))
17338 op1
= TREE_TYPE (op1
);
17341 /* When there are no ARGS, we are trying to evaluate a
17342 non-dependent expression from the parser. Trying to do
17343 the substitutions may not work. */
17345 op1
= TREE_TYPE (op1
);
17349 ++cp_unevaluated_operand
;
17350 ++c_inhibit_evaluation_warnings
;
17352 op1
= tsubst (op1
, args
, complain
, in_decl
);
17354 op1
= tsubst_copy_and_build (op1
, args
, complain
, in_decl
,
17355 /*function_p=*/false,
17356 /*integral_constant_expression_p=*/
17358 --cp_unevaluated_operand
;
17359 --c_inhibit_evaluation_warnings
;
17362 r
= cxx_sizeof_or_alignof_type (op1
, TREE_CODE (t
),
17363 complain
& tf_error
);
17365 r
= cxx_sizeof_or_alignof_expr (op1
, TREE_CODE (t
),
17366 complain
& tf_error
);
17367 if (TREE_CODE (t
) == SIZEOF_EXPR
&& r
!= error_mark_node
)
17369 if (TREE_CODE (r
) != SIZEOF_EXPR
|| TYPE_P (op1
))
17371 if (!processing_template_decl
&& TYPE_P (op1
))
17373 r
= build_min (SIZEOF_EXPR
, size_type_node
,
17374 build1 (NOP_EXPR
, op1
, error_mark_node
));
17375 SIZEOF_EXPR_TYPE_P (r
) = 1;
17378 r
= build_min (SIZEOF_EXPR
, size_type_node
, op1
);
17379 TREE_SIDE_EFFECTS (r
) = 0;
17380 TREE_READONLY (r
) = 1;
17382 SET_EXPR_LOCATION (r
, EXPR_LOCATION (t
));
17387 case AT_ENCODE_EXPR
:
17389 op1
= TREE_OPERAND (t
, 0);
17390 ++cp_unevaluated_operand
;
17391 ++c_inhibit_evaluation_warnings
;
17392 op1
= tsubst_copy_and_build (op1
, args
, complain
, in_decl
,
17393 /*function_p=*/false,
17394 /*integral_constant_expression_p=*/false);
17395 --cp_unevaluated_operand
;
17396 --c_inhibit_evaluation_warnings
;
17397 RETURN (objc_build_encode_expr (op1
));
17400 case NOEXCEPT_EXPR
:
17401 op1
= TREE_OPERAND (t
, 0);
17402 ++cp_unevaluated_operand
;
17403 ++c_inhibit_evaluation_warnings
;
17404 ++cp_noexcept_operand
;
17405 op1
= tsubst_copy_and_build (op1
, args
, complain
, in_decl
,
17406 /*function_p=*/false,
17407 /*integral_constant_expression_p=*/false);
17408 --cp_unevaluated_operand
;
17409 --c_inhibit_evaluation_warnings
;
17410 --cp_noexcept_operand
;
17411 RETURN (finish_noexcept_expr (op1
, complain
));
17415 warning_sentinel
s(warn_div_by_zero
);
17416 tree lhs
= RECUR (TREE_OPERAND (t
, 0));
17417 tree rhs
= RECUR (TREE_OPERAND (t
, 2));
17418 tree r
= build_x_modify_expr
17419 (EXPR_LOCATION (t
), lhs
, TREE_CODE (TREE_OPERAND (t
, 1)), rhs
,
17420 complain
|decltype_flag
);
17421 /* TREE_NO_WARNING must be set if either the expression was
17422 parenthesized or it uses an operator such as >>= rather
17423 than plain assignment. In the former case, it was already
17424 set and must be copied. In the latter case,
17425 build_x_modify_expr sets it and it must not be reset
17427 if (TREE_NO_WARNING (t
))
17428 TREE_NO_WARNING (r
) = TREE_NO_WARNING (t
);
17434 op1
= tsubst_non_call_postfix_expression (TREE_OPERAND (t
, 0),
17435 args
, complain
, in_decl
);
17436 /* Remember that there was a reference to this entity. */
17438 && !mark_used (op1
, complain
) && !(complain
& tf_error
))
17439 RETURN (error_mark_node
);
17440 RETURN (build_x_arrow (input_location
, op1
, complain
));
17444 tree placement
= RECUR (TREE_OPERAND (t
, 0));
17445 tree init
= RECUR (TREE_OPERAND (t
, 3));
17446 vec
<tree
, va_gc
> *placement_vec
;
17447 vec
<tree
, va_gc
> *init_vec
;
17450 if (placement
== NULL_TREE
)
17451 placement_vec
= NULL
;
17454 placement_vec
= make_tree_vector ();
17455 for (; placement
!= NULL_TREE
; placement
= TREE_CHAIN (placement
))
17456 vec_safe_push (placement_vec
, TREE_VALUE (placement
));
17459 /* If there was an initializer in the original tree, but it
17460 instantiated to an empty list, then we should pass a
17461 non-NULL empty vector to tell build_new that it was an
17462 empty initializer() rather than no initializer. This can
17463 only happen when the initializer is a pack expansion whose
17464 parameter packs are of length zero. */
17465 if (init
== NULL_TREE
&& TREE_OPERAND (t
, 3) == NULL_TREE
)
17469 init_vec
= make_tree_vector ();
17470 if (init
== void_node
)
17471 gcc_assert (init_vec
!= NULL
);
17474 for (; init
!= NULL_TREE
; init
= TREE_CHAIN (init
))
17475 vec_safe_push (init_vec
, TREE_VALUE (init
));
17479 tree op1
= tsubst (TREE_OPERAND (t
, 1), args
, complain
, in_decl
);
17480 tree op2
= RECUR (TREE_OPERAND (t
, 2));
17481 ret
= build_new (&placement_vec
, op1
, op2
, &init_vec
,
17482 NEW_EXPR_USE_GLOBAL (t
),
17485 if (placement_vec
!= NULL
)
17486 release_tree_vector (placement_vec
);
17487 if (init_vec
!= NULL
)
17488 release_tree_vector (init_vec
);
17495 tree op0
= RECUR (TREE_OPERAND (t
, 0));
17496 tree op1
= RECUR (TREE_OPERAND (t
, 1));
17497 RETURN (delete_sanity (op0
, op1
,
17498 DELETE_EXPR_USE_VEC (t
),
17499 DELETE_EXPR_USE_GLOBAL (t
),
17503 case COMPOUND_EXPR
:
17505 tree op0
= tsubst_copy_and_build (TREE_OPERAND (t
, 0), args
,
17506 complain
& ~tf_decltype
, in_decl
,
17507 /*function_p=*/false,
17508 integral_constant_expression_p
);
17509 RETURN (build_x_compound_expr (EXPR_LOCATION (t
),
17511 RECUR (TREE_OPERAND (t
, 1)),
17512 complain
|decltype_flag
));
17518 vec
<tree
, va_gc
> *call_args
;
17519 unsigned int nargs
, i
;
17524 function
= CALL_EXPR_FN (t
);
17525 /* Internal function with no arguments. */
17526 if (function
== NULL_TREE
&& call_expr_nargs (t
) == 0)
17529 /* When we parsed the expression, we determined whether or
17530 not Koenig lookup should be performed. */
17531 koenig_p
= KOENIG_LOOKUP_P (t
);
17532 if (function
== NULL_TREE
)
17535 qualified_p
= false;
17537 else if (TREE_CODE (function
) == SCOPE_REF
)
17539 qualified_p
= true;
17540 function
= tsubst_qualified_id (function
, args
, complain
, in_decl
,
17542 /*address_p=*/false);
17544 else if (koenig_p
&& identifier_p (function
))
17546 /* Do nothing; calling tsubst_copy_and_build on an identifier
17547 would incorrectly perform unqualified lookup again.
17549 Note that we can also have an IDENTIFIER_NODE if the earlier
17550 unqualified lookup found a member function; in that case
17551 koenig_p will be false and we do want to do the lookup
17552 again to find the instantiated member function.
17554 FIXME but doing that causes c++/15272, so we need to stop
17555 using IDENTIFIER_NODE in that situation. */
17556 qualified_p
= false;
17560 if (TREE_CODE (function
) == COMPONENT_REF
)
17562 tree op
= TREE_OPERAND (function
, 1);
17564 qualified_p
= (TREE_CODE (op
) == SCOPE_REF
17565 || (BASELINK_P (op
)
17566 && BASELINK_QUALIFIED_P (op
)));
17569 qualified_p
= false;
17571 if (TREE_CODE (function
) == ADDR_EXPR
17572 && TREE_CODE (TREE_OPERAND (function
, 0)) == FUNCTION_DECL
)
17573 /* Avoid error about taking the address of a constructor. */
17574 function
= TREE_OPERAND (function
, 0);
17576 function
= tsubst_copy_and_build (function
, args
, complain
,
17579 integral_constant_expression_p
);
17581 if (BASELINK_P (function
))
17582 qualified_p
= true;
17585 nargs
= call_expr_nargs (t
);
17586 call_args
= make_tree_vector ();
17587 for (i
= 0; i
< nargs
; ++i
)
17589 tree arg
= CALL_EXPR_ARG (t
, i
);
17591 if (!PACK_EXPANSION_P (arg
))
17592 vec_safe_push (call_args
, RECUR (CALL_EXPR_ARG (t
, i
)));
17595 /* Expand the pack expansion and push each entry onto
17597 arg
= tsubst_pack_expansion (arg
, args
, complain
, in_decl
);
17598 if (TREE_CODE (arg
) == TREE_VEC
)
17600 unsigned int len
, j
;
17602 len
= TREE_VEC_LENGTH (arg
);
17603 for (j
= 0; j
< len
; ++j
)
17605 tree value
= TREE_VEC_ELT (arg
, j
);
17606 if (value
!= NULL_TREE
)
17607 value
= convert_from_reference (value
);
17608 vec_safe_push (call_args
, value
);
17613 /* A partial substitution. Add one entry. */
17614 vec_safe_push (call_args
, arg
);
17619 /* We do not perform argument-dependent lookup if normal
17620 lookup finds a non-function, in accordance with the
17621 expected resolution of DR 218. */
17623 && ((is_overloaded_fn (function
)
17624 /* If lookup found a member function, the Koenig lookup is
17625 not appropriate, even if an unqualified-name was used
17626 to denote the function. */
17627 && !DECL_FUNCTION_MEMBER_P (get_first_fn (function
)))
17628 || identifier_p (function
))
17629 /* Only do this when substitution turns a dependent call
17630 into a non-dependent call. */
17631 && type_dependent_expression_p_push (t
)
17632 && !any_type_dependent_arguments_p (call_args
))
17633 function
= perform_koenig_lookup (function
, call_args
, tf_none
);
17635 if (function
!= NULL_TREE
17636 && identifier_p (function
)
17637 && !any_type_dependent_arguments_p (call_args
))
17639 if (koenig_p
&& (complain
& tf_warning_or_error
))
17641 /* For backwards compatibility and good diagnostics, try
17642 the unqualified lookup again if we aren't in SFINAE
17644 tree unq
= (tsubst_copy_and_build
17645 (function
, args
, complain
, in_decl
, true,
17646 integral_constant_expression_p
));
17647 if (unq
== error_mark_node
)
17649 release_tree_vector (call_args
);
17650 RETURN (error_mark_node
);
17653 if (unq
!= function
)
17655 /* In a lambda fn, we have to be careful to not
17656 introduce new this captures. Legacy code can't
17657 be using lambdas anyway, so it's ok to be
17659 bool in_lambda
= (current_class_type
17660 && LAMBDA_TYPE_P (current_class_type
));
17661 char const *const msg
17662 = G_("%qD was not declared in this scope, "
17663 "and no declarations were found by "
17664 "argument-dependent lookup at the point "
17665 "of instantiation");
17669 error_at (EXPR_LOC_OR_LOC (t
, input_location
),
17672 diag
= permerror (EXPR_LOC_OR_LOC (t
, input_location
),
17678 if (INDIRECT_REF_P (fn
))
17679 fn
= TREE_OPERAND (fn
, 0);
17680 if (is_overloaded_fn (fn
))
17681 fn
= get_first_fn (fn
);
17684 /* Can't say anything more. */;
17685 else if (DECL_CLASS_SCOPE_P (fn
))
17687 location_t loc
= EXPR_LOC_OR_LOC (t
,
17690 "declarations in dependent base %qT are "
17691 "not found by unqualified lookup",
17692 DECL_CLASS_CONTEXT (fn
));
17693 if (current_class_ptr
)
17695 "use %<this->%D%> instead", function
);
17698 "use %<%T::%D%> instead",
17699 current_class_name
, function
);
17702 inform (DECL_SOURCE_LOCATION (fn
),
17703 "%qD declared here, later in the "
17704 "translation unit", fn
);
17707 release_tree_vector (call_args
);
17708 RETURN (error_mark_node
);
17715 if (identifier_p (function
))
17717 if (complain
& tf_error
)
17718 unqualified_name_lookup_error (function
);
17719 release_tree_vector (call_args
);
17720 RETURN (error_mark_node
);
17724 /* Remember that there was a reference to this entity. */
17725 if (function
!= NULL_TREE
17726 && DECL_P (function
)
17727 && !mark_used (function
, complain
) && !(complain
& tf_error
))
17729 release_tree_vector (call_args
);
17730 RETURN (error_mark_node
);
17733 /* Put back tf_decltype for the actual call. */
17734 complain
|= decltype_flag
;
17736 if (function
== NULL_TREE
)
17737 switch (CALL_EXPR_IFN (t
))
17740 gcc_assert (nargs
== 1);
17741 if (vec_safe_length (call_args
) != 1)
17743 error_at (EXPR_LOC_OR_LOC (t
, input_location
),
17744 "wrong number of arguments to "
17745 "%<__builtin_launder%>");
17746 ret
= error_mark_node
;
17749 ret
= finish_builtin_launder (EXPR_LOC_OR_LOC (t
,
17751 (*call_args
)[0], complain
);
17755 /* Unsupported internal function with arguments. */
17756 gcc_unreachable ();
17758 else if (TREE_CODE (function
) == OFFSET_REF
)
17759 ret
= build_offset_ref_call_from_tree (function
, &call_args
,
17761 else if (TREE_CODE (function
) == COMPONENT_REF
)
17763 tree instance
= TREE_OPERAND (function
, 0);
17764 tree fn
= TREE_OPERAND (function
, 1);
17766 if (processing_template_decl
17767 && (type_dependent_expression_p (instance
)
17768 || (!BASELINK_P (fn
)
17769 && TREE_CODE (fn
) != FIELD_DECL
)
17770 || type_dependent_expression_p (fn
)
17771 || any_type_dependent_arguments_p (call_args
)))
17772 ret
= build_min_nt_call_vec (function
, call_args
);
17773 else if (!BASELINK_P (fn
))
17774 ret
= finish_call_expr (function
, &call_args
,
17775 /*disallow_virtual=*/false,
17776 /*koenig_p=*/false,
17779 ret
= (build_new_method_call
17781 &call_args
, NULL_TREE
,
17782 qualified_p
? LOOKUP_NONVIRTUAL
: LOOKUP_NORMAL
,
17787 ret
= finish_call_expr (function
, &call_args
,
17788 /*disallow_virtual=*/qualified_p
,
17792 release_tree_vector (call_args
);
17794 if (ret
!= error_mark_node
)
17796 bool op
= CALL_EXPR_OPERATOR_SYNTAX (t
);
17797 bool ord
= CALL_EXPR_ORDERED_ARGS (t
);
17798 bool rev
= CALL_EXPR_REVERSE_ARGS (t
);
17799 bool thk
= CALL_FROM_THUNK_P (t
);
17800 if (op
|| ord
|| rev
|| thk
)
17802 function
= extract_call_expr (ret
);
17803 CALL_EXPR_OPERATOR_SYNTAX (function
) = op
;
17804 CALL_EXPR_ORDERED_ARGS (function
) = ord
;
17805 CALL_EXPR_REVERSE_ARGS (function
) = rev
;
17808 CALL_FROM_THUNK_P (function
) = true;
17809 /* The thunk location is not interesting. */
17810 SET_EXPR_LOCATION (function
, UNKNOWN_LOCATION
);
17820 tree cond
= RECUR (TREE_OPERAND (t
, 0));
17821 tree folded_cond
= fold_non_dependent_expr (cond
);
17824 if (TREE_CODE (folded_cond
) == INTEGER_CST
)
17826 if (integer_zerop (folded_cond
))
17828 ++c_inhibit_evaluation_warnings
;
17829 exp1
= RECUR (TREE_OPERAND (t
, 1));
17830 --c_inhibit_evaluation_warnings
;
17831 exp2
= RECUR (TREE_OPERAND (t
, 2));
17835 exp1
= RECUR (TREE_OPERAND (t
, 1));
17836 ++c_inhibit_evaluation_warnings
;
17837 exp2
= RECUR (TREE_OPERAND (t
, 2));
17838 --c_inhibit_evaluation_warnings
;
17840 cond
= folded_cond
;
17844 exp1
= RECUR (TREE_OPERAND (t
, 1));
17845 exp2
= RECUR (TREE_OPERAND (t
, 2));
17848 RETURN (build_x_conditional_expr (EXPR_LOCATION (t
),
17849 cond
, exp1
, exp2
, complain
));
17852 case PSEUDO_DTOR_EXPR
:
17854 tree op0
= RECUR (TREE_OPERAND (t
, 0));
17855 tree op1
= RECUR (TREE_OPERAND (t
, 1));
17856 tree op2
= tsubst (TREE_OPERAND (t
, 2), args
, complain
, in_decl
);
17857 RETURN (finish_pseudo_destructor_expr (op0
, op1
, op2
,
17863 tree purpose
, value
, chain
;
17865 if (t
== void_list_node
)
17868 if ((TREE_PURPOSE (t
) && PACK_EXPANSION_P (TREE_PURPOSE (t
)))
17869 || (TREE_VALUE (t
) && PACK_EXPANSION_P (TREE_VALUE (t
))))
17871 /* We have pack expansions, so expand those and
17872 create a new list out of it. */
17873 tree purposevec
= NULL_TREE
;
17874 tree valuevec
= NULL_TREE
;
17878 /* Expand the argument expressions. */
17879 if (TREE_PURPOSE (t
))
17880 purposevec
= tsubst_pack_expansion (TREE_PURPOSE (t
), args
,
17881 complain
, in_decl
);
17882 if (TREE_VALUE (t
))
17883 valuevec
= tsubst_pack_expansion (TREE_VALUE (t
), args
,
17884 complain
, in_decl
);
17886 /* Build the rest of the list. */
17887 chain
= TREE_CHAIN (t
);
17888 if (chain
&& chain
!= void_type_node
)
17889 chain
= RECUR (chain
);
17891 /* Determine the number of arguments. */
17892 if (purposevec
&& TREE_CODE (purposevec
) == TREE_VEC
)
17894 len
= TREE_VEC_LENGTH (purposevec
);
17895 gcc_assert (!valuevec
|| len
== TREE_VEC_LENGTH (valuevec
));
17897 else if (TREE_CODE (valuevec
) == TREE_VEC
)
17898 len
= TREE_VEC_LENGTH (valuevec
);
17901 /* Since we only performed a partial substitution into
17902 the argument pack, we only RETURN (a single list
17904 if (purposevec
== TREE_PURPOSE (t
)
17905 && valuevec
== TREE_VALUE (t
)
17906 && chain
== TREE_CHAIN (t
))
17909 RETURN (tree_cons (purposevec
, valuevec
, chain
));
17912 /* Convert the argument vectors into a TREE_LIST */
17916 /* Grab the Ith values. */
17918 purpose
= purposevec
? TREE_VEC_ELT (purposevec
, i
)
17921 = valuevec
? convert_from_reference (TREE_VEC_ELT (valuevec
, i
))
17924 /* Build the list (backwards). */
17925 chain
= tree_cons (purpose
, value
, chain
);
17931 purpose
= TREE_PURPOSE (t
);
17933 purpose
= RECUR (purpose
);
17934 value
= TREE_VALUE (t
);
17936 value
= RECUR (value
);
17937 chain
= TREE_CHAIN (t
);
17938 if (chain
&& chain
!= void_type_node
)
17939 chain
= RECUR (chain
);
17940 if (purpose
== TREE_PURPOSE (t
)
17941 && value
== TREE_VALUE (t
)
17942 && chain
== TREE_CHAIN (t
))
17944 RETURN (tree_cons (purpose
, value
, chain
));
17947 case COMPONENT_REF
:
17954 object
= tsubst_non_call_postfix_expression (TREE_OPERAND (t
, 0),
17955 args
, complain
, in_decl
);
17956 /* Remember that there was a reference to this entity. */
17957 if (DECL_P (object
)
17958 && !mark_used (object
, complain
) && !(complain
& tf_error
))
17959 RETURN (error_mark_node
);
17960 object_type
= TREE_TYPE (object
);
17962 member
= TREE_OPERAND (t
, 1);
17963 if (BASELINK_P (member
))
17964 member
= tsubst_baselink (member
,
17965 non_reference (TREE_TYPE (object
)),
17966 args
, complain
, in_decl
);
17968 member
= tsubst_copy (member
, args
, complain
, in_decl
);
17969 if (member
== error_mark_node
)
17970 RETURN (error_mark_node
);
17972 if (TREE_CODE (member
) == FIELD_DECL
)
17974 r
= finish_non_static_data_member (member
, object
, NULL_TREE
);
17975 if (TREE_CODE (r
) == COMPONENT_REF
)
17976 REF_PARENTHESIZED_P (r
) = REF_PARENTHESIZED_P (t
);
17979 else if (type_dependent_expression_p (object
))
17980 /* We can't do much here. */;
17981 else if (!CLASS_TYPE_P (object_type
))
17983 if (scalarish_type_p (object_type
))
17985 tree s
= NULL_TREE
;
17986 tree dtor
= member
;
17988 if (TREE_CODE (dtor
) == SCOPE_REF
)
17990 s
= TREE_OPERAND (dtor
, 0);
17991 dtor
= TREE_OPERAND (dtor
, 1);
17993 if (TREE_CODE (dtor
) == BIT_NOT_EXPR
)
17995 dtor
= TREE_OPERAND (dtor
, 0);
17997 RETURN (finish_pseudo_destructor_expr
17998 (object
, s
, dtor
, input_location
));
18002 else if (TREE_CODE (member
) == SCOPE_REF
18003 && TREE_CODE (TREE_OPERAND (member
, 1)) == TEMPLATE_ID_EXPR
)
18005 /* Lookup the template functions now that we know what the
18007 tree scope
= TREE_OPERAND (member
, 0);
18008 tree tmpl
= TREE_OPERAND (TREE_OPERAND (member
, 1), 0);
18009 tree args
= TREE_OPERAND (TREE_OPERAND (member
, 1), 1);
18010 member
= lookup_qualified_name (scope
, tmpl
,
18011 /*is_type_p=*/false,
18012 /*complain=*/false);
18013 if (BASELINK_P (member
))
18015 BASELINK_FUNCTIONS (member
)
18016 = build_nt (TEMPLATE_ID_EXPR
, BASELINK_FUNCTIONS (member
),
18018 member
= (adjust_result_of_qualified_name_lookup
18019 (member
, BINFO_TYPE (BASELINK_BINFO (member
)),
18024 qualified_name_lookup_error (scope
, tmpl
, member
,
18026 RETURN (error_mark_node
);
18029 else if (TREE_CODE (member
) == SCOPE_REF
18030 && !CLASS_TYPE_P (TREE_OPERAND (member
, 0))
18031 && TREE_CODE (TREE_OPERAND (member
, 0)) != NAMESPACE_DECL
)
18033 if (complain
& tf_error
)
18035 if (TYPE_P (TREE_OPERAND (member
, 0)))
18036 error ("%qT is not a class or namespace",
18037 TREE_OPERAND (member
, 0));
18039 error ("%qD is not a class or namespace",
18040 TREE_OPERAND (member
, 0));
18042 RETURN (error_mark_node
);
18045 r
= finish_class_member_access_expr (object
, member
,
18046 /*template_p=*/false,
18048 if (TREE_CODE (r
) == COMPONENT_REF
)
18049 REF_PARENTHESIZED_P (r
) = REF_PARENTHESIZED_P (t
);
18054 RETURN (build_throw
18055 (RECUR (TREE_OPERAND (t
, 0))));
18059 vec
<constructor_elt
, va_gc
> *n
;
18060 constructor_elt
*ce
;
18061 unsigned HOST_WIDE_INT idx
;
18062 tree type
= tsubst (TREE_TYPE (t
), args
, complain
, in_decl
);
18063 bool process_index_p
;
18065 bool need_copy_p
= false;
18068 if (type
== error_mark_node
)
18069 RETURN (error_mark_node
);
18071 /* digest_init will do the wrong thing if we let it. */
18072 if (type
&& TYPE_PTRMEMFUNC_P (type
))
18075 /* We do not want to process the index of aggregate
18076 initializers as they are identifier nodes which will be
18077 looked up by digest_init. */
18078 process_index_p
= !(type
&& MAYBE_CLASS_TYPE_P (type
));
18080 n
= vec_safe_copy (CONSTRUCTOR_ELTS (t
));
18081 newlen
= vec_safe_length (n
);
18082 FOR_EACH_VEC_SAFE_ELT (n
, idx
, ce
)
18084 if (ce
->index
&& process_index_p
18085 /* An identifier index is looked up in the type
18086 being initialized, not the current scope. */
18087 && TREE_CODE (ce
->index
) != IDENTIFIER_NODE
)
18088 ce
->index
= RECUR (ce
->index
);
18090 if (PACK_EXPANSION_P (ce
->value
))
18092 /* Substitute into the pack expansion. */
18093 ce
->value
= tsubst_pack_expansion (ce
->value
, args
, complain
,
18096 if (ce
->value
== error_mark_node
18097 || PACK_EXPANSION_P (ce
->value
))
18099 else if (TREE_VEC_LENGTH (ce
->value
) == 1)
18100 /* Just move the argument into place. */
18101 ce
->value
= TREE_VEC_ELT (ce
->value
, 0);
18104 /* Update the length of the final CONSTRUCTOR
18105 arguments vector, and note that we will need to
18107 newlen
= newlen
+ TREE_VEC_LENGTH (ce
->value
) - 1;
18108 need_copy_p
= true;
18112 ce
->value
= RECUR (ce
->value
);
18117 vec
<constructor_elt
, va_gc
> *old_n
= n
;
18119 vec_alloc (n
, newlen
);
18120 FOR_EACH_VEC_ELT (*old_n
, idx
, ce
)
18122 if (TREE_CODE (ce
->value
) == TREE_VEC
)
18124 int i
, len
= TREE_VEC_LENGTH (ce
->value
);
18125 for (i
= 0; i
< len
; ++i
)
18126 CONSTRUCTOR_APPEND_ELT (n
, 0,
18127 TREE_VEC_ELT (ce
->value
, i
));
18130 CONSTRUCTOR_APPEND_ELT (n
, 0, ce
->value
);
18134 r
= build_constructor (init_list_type_node
, n
);
18135 CONSTRUCTOR_IS_DIRECT_INIT (r
) = CONSTRUCTOR_IS_DIRECT_INIT (t
);
18137 if (TREE_HAS_CONSTRUCTOR (t
))
18139 fcl_t cl
= fcl_functional
;
18140 if (CONSTRUCTOR_C99_COMPOUND_LITERAL (t
))
18142 RETURN (finish_compound_literal (type
, r
, complain
, cl
));
18145 TREE_TYPE (r
) = type
;
18151 tree operand_0
= TREE_OPERAND (t
, 0);
18152 if (TYPE_P (operand_0
))
18154 operand_0
= tsubst (operand_0
, args
, complain
, in_decl
);
18155 RETURN (get_typeid (operand_0
, complain
));
18159 operand_0
= RECUR (operand_0
);
18160 RETURN (build_typeid (operand_0
, complain
));
18167 else if (DECL_PACK_P (t
))
18169 /* We don't build decls for an instantiation of a
18170 variadic capture proxy, we instantiate the elements
18172 gcc_assert (DECL_HAS_VALUE_EXPR_P (t
));
18173 return RECUR (DECL_VALUE_EXPR (t
));
18179 tree r
= tsubst_copy (t
, args
, complain
, in_decl
);
18180 /* ??? We're doing a subset of finish_id_expression here. */
18182 && !processing_template_decl
18183 && !cp_unevaluated_operand
18184 && (TREE_STATIC (r
) || DECL_EXTERNAL (r
))
18185 && CP_DECL_THREAD_LOCAL_P (r
))
18187 if (tree wrap
= get_tls_wrapper_fn (r
))
18188 /* Replace an evaluated use of the thread_local variable with
18189 a call to its wrapper. */
18190 r
= build_cxx_call (wrap
, 0, NULL
, tf_warning_or_error
);
18192 else if (outer_automatic_var_p (r
))
18193 r
= process_outer_var_ref (r
, complain
);
18195 if (TREE_CODE (TREE_TYPE (t
)) != REFERENCE_TYPE
)
18196 /* If the original type was a reference, we'll be wrapped in
18197 the appropriate INDIRECT_REF. */
18198 r
= convert_from_reference (r
);
18204 tree op0
= RECUR (TREE_OPERAND (t
, 0));
18205 tree type
= tsubst (TREE_TYPE (t
), args
, complain
, in_decl
);
18206 RETURN (build_x_va_arg (EXPR_LOCATION (t
), op0
, type
));
18209 case OFFSETOF_EXPR
:
18212 = tsubst_copy_and_build (TREE_OPERAND (t
, 1), args
, complain
,
18213 in_decl
, /*function_p=*/false,
18214 /*integral_constant_expression_p=*/false);
18215 RETURN (finish_offsetof (object_ptr
,
18216 RECUR (TREE_OPERAND (t
, 0)),
18217 EXPR_LOCATION (t
)));
18220 case ADDRESSOF_EXPR
:
18221 RETURN (cp_build_addressof (EXPR_LOCATION (t
),
18222 RECUR (TREE_OPERAND (t
, 0)), complain
));
18226 tree type1
= tsubst (TRAIT_EXPR_TYPE1 (t
), args
,
18227 complain
, in_decl
);
18229 tree type2
= TRAIT_EXPR_TYPE2 (t
);
18230 if (type2
&& TREE_CODE (type2
) == TREE_LIST
)
18231 type2
= RECUR (type2
);
18233 type2
= tsubst (type2
, args
, complain
, in_decl
);
18235 RETURN (finish_trait_expr (TRAIT_EXPR_KIND (t
), type1
, type2
));
18240 tree old_stmt_expr
= cur_stmt_expr
;
18241 tree stmt_expr
= begin_stmt_expr ();
18243 cur_stmt_expr
= stmt_expr
;
18244 tsubst_expr (STMT_EXPR_STMT (t
), args
, complain
, in_decl
,
18245 integral_constant_expression_p
);
18246 stmt_expr
= finish_stmt_expr (stmt_expr
, false);
18247 cur_stmt_expr
= old_stmt_expr
;
18249 /* If the resulting list of expression statement is empty,
18250 fold it further into void_node. */
18251 if (empty_expr_stmt_p (stmt_expr
))
18252 stmt_expr
= void_node
;
18254 RETURN (stmt_expr
);
18259 tree r
= tsubst_lambda_expr (t
, args
, complain
, in_decl
);
18261 RETURN (build_lambda_object (r
));
18265 /* We can get here for a constant initializer of non-dependent type.
18266 FIXME stop folding in cp_parser_initializer_clause. */
18268 tree r
= get_target_expr_sfinae (RECUR (TARGET_EXPR_INITIAL (t
)),
18273 case TRANSACTION_EXPR
:
18274 RETURN (tsubst_expr(t
, args
, complain
, in_decl
,
18275 integral_constant_expression_p
));
18278 RETURN (finish_parenthesized_expr (RECUR (TREE_OPERAND (t
, 0))));
18280 case VEC_PERM_EXPR
:
18282 tree op0
= RECUR (TREE_OPERAND (t
, 0));
18283 tree op1
= RECUR (TREE_OPERAND (t
, 1));
18284 tree op2
= RECUR (TREE_OPERAND (t
, 2));
18285 RETURN (build_x_vec_perm_expr (input_location
, op0
, op1
, op2
,
18289 case REQUIRES_EXPR
:
18290 RETURN (tsubst_requires_expr (t
, args
, complain
, in_decl
));
18293 /* Handle Objective-C++ constructs, if appropriate. */
18296 = objcp_tsubst_copy_and_build (t
, args
, complain
,
18297 in_decl
, /*function_p=*/false);
18301 RETURN (tsubst_copy (t
, args
, complain
, in_decl
));
18307 input_location
= loc
;
18311 /* Verify that the instantiated ARGS are valid. For type arguments,
18312 make sure that the type's linkage is ok. For non-type arguments,
18313 make sure they are constants if they are integral or enumerations.
18314 Emit an error under control of COMPLAIN, and return TRUE on error. */
18317 check_instantiated_arg (tree tmpl
, tree t
, tsubst_flags_t complain
)
18319 if (dependent_template_arg_p (t
))
18321 if (ARGUMENT_PACK_P (t
))
18323 tree vec
= ARGUMENT_PACK_ARGS (t
);
18324 int len
= TREE_VEC_LENGTH (vec
);
18325 bool result
= false;
18328 for (i
= 0; i
< len
; ++i
)
18329 if (check_instantiated_arg (tmpl
, TREE_VEC_ELT (vec
, i
), complain
))
18333 else if (TYPE_P (t
))
18335 /* [basic.link]: A name with no linkage (notably, the name
18336 of a class or enumeration declared in a local scope)
18337 shall not be used to declare an entity with linkage.
18338 This implies that names with no linkage cannot be used as
18341 DR 757 relaxes this restriction for C++0x. */
18342 tree nt
= (cxx_dialect
> cxx98
? NULL_TREE
18343 : no_linkage_check (t
, /*relaxed_p=*/false));
18347 /* DR 488 makes use of a type with no linkage cause
18348 type deduction to fail. */
18349 if (complain
& tf_error
)
18351 if (TYPE_UNNAMED_P (nt
))
18352 error ("%qT is/uses unnamed type", t
);
18354 error ("template argument for %qD uses local type %qT",
18359 /* In order to avoid all sorts of complications, we do not
18360 allow variably-modified types as template arguments. */
18361 else if (variably_modified_type_p (t
, NULL_TREE
))
18363 if (complain
& tf_error
)
18364 error ("%qT is a variably modified type", t
);
18368 /* Class template and alias template arguments should be OK. */
18369 else if (DECL_TYPE_TEMPLATE_P (t
))
18371 /* A non-type argument of integral or enumerated type must be a
18373 else if (TREE_TYPE (t
)
18374 && INTEGRAL_OR_ENUMERATION_TYPE_P (TREE_TYPE (t
))
18375 && !REFERENCE_REF_P (t
)
18376 && !TREE_CONSTANT (t
))
18378 if (complain
& tf_error
)
18379 error ("integral expression %qE is not constant", t
);
18386 check_instantiated_args (tree tmpl
, tree args
, tsubst_flags_t complain
)
18388 int ix
, len
= DECL_NTPARMS (tmpl
);
18389 bool result
= false;
18391 for (ix
= 0; ix
!= len
; ix
++)
18393 if (check_instantiated_arg (tmpl
, TREE_VEC_ELT (args
, ix
), complain
))
18396 if (result
&& (complain
& tf_error
))
18397 error (" trying to instantiate %qD", tmpl
);
18401 /* We're out of SFINAE context now, so generate diagnostics for the access
18402 errors we saw earlier when instantiating D from TMPL and ARGS. */
18405 recheck_decl_substitution (tree d
, tree tmpl
, tree args
)
18407 tree pattern
= DECL_TEMPLATE_RESULT (tmpl
);
18408 tree type
= TREE_TYPE (pattern
);
18409 location_t loc
= input_location
;
18411 push_access_scope (d
);
18412 push_deferring_access_checks (dk_no_deferred
);
18413 input_location
= DECL_SOURCE_LOCATION (pattern
);
18414 tsubst (type
, args
, tf_warning_or_error
, d
);
18415 input_location
= loc
;
18416 pop_deferring_access_checks ();
18417 pop_access_scope (d
);
18420 /* Instantiate the indicated variable, function, or alias template TMPL with
18421 the template arguments in TARG_PTR. */
18424 instantiate_template_1 (tree tmpl
, tree orig_args
, tsubst_flags_t complain
)
18426 tree targ_ptr
= orig_args
;
18430 bool access_ok
= true;
18432 if (tmpl
== error_mark_node
)
18433 return error_mark_node
;
18435 gcc_assert (TREE_CODE (tmpl
) == TEMPLATE_DECL
);
18437 /* If this function is a clone, handle it specially. */
18438 if (DECL_CLONED_FUNCTION_P (tmpl
))
18443 /* Use DECL_ABSTRACT_ORIGIN because only FUNCTION_DECLs have
18444 DECL_CLONED_FUNCTION. */
18445 spec
= instantiate_template (DECL_ABSTRACT_ORIGIN (tmpl
),
18446 targ_ptr
, complain
);
18447 if (spec
== error_mark_node
)
18448 return error_mark_node
;
18450 /* Look for the clone. */
18451 FOR_EACH_CLONE (clone
, spec
)
18452 if (DECL_NAME (clone
) == DECL_NAME (tmpl
))
18454 /* We should always have found the clone by now. */
18455 gcc_unreachable ();
18459 if (targ_ptr
== error_mark_node
)
18460 return error_mark_node
;
18462 /* Check to see if we already have this specialization. */
18463 gen_tmpl
= most_general_template (tmpl
);
18464 if (TMPL_ARGS_DEPTH (targ_ptr
)
18465 < TMPL_PARMS_DEPTH (DECL_TEMPLATE_PARMS (gen_tmpl
)))
18466 /* targ_ptr only has the innermost template args, so add the outer ones
18467 from tmpl, which could be either a partial instantiation or gen_tmpl (in
18468 the case of a non-dependent call within a template definition). */
18469 targ_ptr
= (add_outermost_template_args
18470 (DECL_TI_ARGS (DECL_TEMPLATE_RESULT (tmpl
)),
18473 /* It would be nice to avoid hashing here and then again in tsubst_decl,
18474 but it doesn't seem to be on the hot path. */
18475 spec
= retrieve_specialization (gen_tmpl
, targ_ptr
, 0);
18477 gcc_assert (tmpl
== gen_tmpl
18478 || ((fndecl
= retrieve_specialization (tmpl
, orig_args
, 0))
18480 || fndecl
== NULL_TREE
);
18482 if (spec
!= NULL_TREE
)
18484 if (FNDECL_HAS_ACCESS_ERRORS (spec
))
18486 if (complain
& tf_error
)
18487 recheck_decl_substitution (spec
, gen_tmpl
, targ_ptr
);
18488 return error_mark_node
;
18493 if (check_instantiated_args (gen_tmpl
, INNERMOST_TEMPLATE_ARGS (targ_ptr
),
18495 return error_mark_node
;
18497 /* We are building a FUNCTION_DECL, during which the access of its
18498 parameters and return types have to be checked. However this
18499 FUNCTION_DECL which is the desired context for access checking
18500 is not built yet. We solve this chicken-and-egg problem by
18501 deferring all checks until we have the FUNCTION_DECL. */
18502 push_deferring_access_checks (dk_deferred
);
18504 /* Instantiation of the function happens in the context of the function
18505 template, not the context of the overload resolution we're doing. */
18506 push_to_top_level ();
18507 /* If there are dependent arguments, e.g. because we're doing partial
18508 ordering, make sure processing_template_decl stays set. */
18509 if (uses_template_parms (targ_ptr
))
18510 ++processing_template_decl
;
18511 if (DECL_CLASS_SCOPE_P (gen_tmpl
))
18513 tree ctx
= tsubst_aggr_type (DECL_CONTEXT (gen_tmpl
), targ_ptr
,
18514 complain
, gen_tmpl
, true);
18515 push_nested_class (ctx
);
18518 tree pattern
= DECL_TEMPLATE_RESULT (gen_tmpl
);
18520 fndecl
= NULL_TREE
;
18521 if (VAR_P (pattern
))
18523 /* We need to determine if we're using a partial or explicit
18524 specialization now, because the type of the variable could be
18526 tree tid
= lookup_template_variable (gen_tmpl
, targ_ptr
);
18527 tree elt
= most_specialized_partial_spec (tid
, complain
);
18528 if (elt
== error_mark_node
)
18529 pattern
= error_mark_node
;
18532 tree partial_tmpl
= TREE_VALUE (elt
);
18533 tree partial_args
= TREE_PURPOSE (elt
);
18534 tree partial_pat
= DECL_TEMPLATE_RESULT (partial_tmpl
);
18535 fndecl
= tsubst (partial_pat
, partial_args
, complain
, gen_tmpl
);
18539 /* Substitute template parameters to obtain the specialization. */
18540 if (fndecl
== NULL_TREE
)
18541 fndecl
= tsubst (pattern
, targ_ptr
, complain
, gen_tmpl
);
18542 if (DECL_CLASS_SCOPE_P (gen_tmpl
))
18543 pop_nested_class ();
18544 pop_from_top_level ();
18546 if (fndecl
== error_mark_node
)
18548 pop_deferring_access_checks ();
18549 return error_mark_node
;
18552 /* The DECL_TI_TEMPLATE should always be the immediate parent
18553 template, not the most general template. */
18554 DECL_TI_TEMPLATE (fndecl
) = tmpl
;
18555 DECL_TI_ARGS (fndecl
) = targ_ptr
;
18557 /* Now we know the specialization, compute access previously
18558 deferred. Do no access control for inheriting constructors,
18559 as we already checked access for the inherited constructor. */
18560 if (!(flag_new_inheriting_ctors
18561 && DECL_INHERITED_CTOR (fndecl
)))
18563 push_access_scope (fndecl
);
18564 if (!perform_deferred_access_checks (complain
))
18566 pop_access_scope (fndecl
);
18568 pop_deferring_access_checks ();
18570 /* If we've just instantiated the main entry point for a function,
18571 instantiate all the alternate entry points as well. We do this
18572 by cloning the instantiation of the main entry point, not by
18573 instantiating the template clones. */
18574 if (DECL_CHAIN (gen_tmpl
) && DECL_CLONED_FUNCTION_P (DECL_CHAIN (gen_tmpl
)))
18575 clone_function_decl (fndecl
, /*update_methods=*/false);
18579 if (!(complain
& tf_error
))
18581 /* Remember to reinstantiate when we're out of SFINAE so the user
18582 can see the errors. */
18583 FNDECL_HAS_ACCESS_ERRORS (fndecl
) = true;
18585 return error_mark_node
;
18590 /* Wrapper for instantiate_template_1. */
18593 instantiate_template (tree tmpl
, tree orig_args
, tsubst_flags_t complain
)
18596 timevar_push (TV_TEMPLATE_INST
);
18597 ret
= instantiate_template_1 (tmpl
, orig_args
, complain
);
18598 timevar_pop (TV_TEMPLATE_INST
);
18602 /* Instantiate the alias template TMPL with ARGS. Also push a template
18603 instantiation level, which instantiate_template doesn't do because
18604 functions and variables have sufficient context established by the
18608 instantiate_alias_template (tree tmpl
, tree args
, tsubst_flags_t complain
)
18610 struct pending_template
*old_last_pend
= last_pending_template
;
18611 struct tinst_level
*old_error_tinst
= last_error_tinst_level
;
18612 if (tmpl
== error_mark_node
|| args
== error_mark_node
)
18613 return error_mark_node
;
18614 tree tinst
= build_tree_list (tmpl
, args
);
18615 if (!push_tinst_level (tinst
))
18618 return error_mark_node
;
18622 coerce_innermost_template_parms (DECL_TEMPLATE_PARMS (tmpl
),
18623 args
, tmpl
, complain
,
18624 /*require_all_args=*/true,
18625 /*use_default_args=*/true);
18627 tree r
= instantiate_template (tmpl
, args
, complain
);
18628 pop_tinst_level ();
18629 /* We can't free this if a pending_template entry or last_error_tinst_level
18630 is pointing at it. */
18631 if (last_pending_template
== old_last_pend
18632 && last_error_tinst_level
== old_error_tinst
)
18638 /* PARM is a template parameter pack for FN. Returns true iff
18639 PARM is used in a deducible way in the argument list of FN. */
18642 pack_deducible_p (tree parm
, tree fn
)
18644 tree t
= FUNCTION_FIRST_USER_PARMTYPE (fn
);
18645 for (; t
; t
= TREE_CHAIN (t
))
18647 tree type
= TREE_VALUE (t
);
18649 if (!PACK_EXPANSION_P (type
))
18651 for (packs
= PACK_EXPANSION_PARAMETER_PACKS (type
);
18652 packs
; packs
= TREE_CHAIN (packs
))
18653 if (template_args_equal (TREE_VALUE (packs
), parm
))
18655 /* The template parameter pack is used in a function parameter
18656 pack. If this is the end of the parameter list, the
18657 template parameter pack is deducible. */
18658 if (TREE_CHAIN (t
) == void_list_node
)
18661 /* Otherwise, not. Well, it could be deduced from
18662 a non-pack parameter, but doing so would end up with
18663 a deduction mismatch, so don't bother. */
18667 /* The template parameter pack isn't used in any function parameter
18668 packs, but it might be used deeper, e.g. tuple<Args...>. */
18672 /* The FN is a TEMPLATE_DECL for a function. ARGS is an array with
18673 NARGS elements of the arguments that are being used when calling
18674 it. TARGS is a vector into which the deduced template arguments
18677 Returns either a FUNCTION_DECL for the matching specialization of FN or
18678 NULL_TREE if no suitable specialization can be found. If EXPLAIN_P is
18679 true, diagnostics will be printed to explain why it failed.
18681 If FN is a conversion operator, or we are trying to produce a specific
18682 specialization, RETURN_TYPE is the return type desired.
18684 The EXPLICIT_TARGS are explicit template arguments provided via a
18687 The parameter STRICT is one of:
18690 We are deducing arguments for a function call, as in
18691 [temp.deduct.call]. If RETURN_TYPE is non-null, we are
18692 deducing arguments for a call to the result of a conversion
18693 function template, as in [over.call.object].
18696 We are deducing arguments for a conversion function, as in
18697 [temp.deduct.conv].
18700 We are deducing arguments when doing an explicit instantiation
18701 as in [temp.explicit], when determining an explicit specialization
18702 as in [temp.expl.spec], or when taking the address of a function
18703 template, as in [temp.deduct.funcaddr]. */
18706 fn_type_unification (tree fn
,
18707 tree explicit_targs
,
18710 unsigned int nargs
,
18712 unification_kind_t strict
,
18719 tree decl
= NULL_TREE
;
18720 tsubst_flags_t complain
= (explain_p
? tf_warning_or_error
: tf_none
);
18722 static int deduction_depth
;
18723 struct pending_template
*old_last_pend
= last_pending_template
;
18724 struct tinst_level
*old_error_tinst
= last_error_tinst_level
;
18727 if (flag_new_inheriting_ctors
)
18728 fn
= strip_inheriting_ctors (fn
);
18730 tree tparms
= DECL_INNERMOST_TEMPLATE_PARMS (fn
);
18732 tree r
= error_mark_node
;
18734 tree full_targs
= targs
;
18735 if (TMPL_ARGS_DEPTH (targs
)
18736 < TMPL_PARMS_DEPTH (DECL_TEMPLATE_PARMS (fn
)))
18737 full_targs
= (add_outermost_template_args
18738 (DECL_TI_ARGS (DECL_TEMPLATE_RESULT (fn
)),
18742 complain
|= tf_decltype
;
18744 /* In C++0x, it's possible to have a function template whose type depends
18745 on itself recursively. This is most obvious with decltype, but can also
18746 occur with enumeration scope (c++/48969). So we need to catch infinite
18747 recursion and reject the substitution at deduction time; this function
18748 will return error_mark_node for any repeated substitution.
18750 This also catches excessive recursion such as when f<N> depends on
18751 f<N-1> across all integers, and returns error_mark_node for all the
18752 substitutions back up to the initial one.
18754 This is, of course, not reentrant. */
18755 if (excessive_deduction_depth
)
18756 return error_mark_node
;
18757 tinst
= build_tree_list (fn
, NULL_TREE
);
18760 gcc_assert (TREE_CODE (fn
) == TEMPLATE_DECL
);
18762 fntype
= TREE_TYPE (fn
);
18763 if (explicit_targs
)
18767 The specified template arguments must match the template
18768 parameters in kind (i.e., type, nontype, template), and there
18769 must not be more arguments than there are parameters;
18770 otherwise type deduction fails.
18772 Nontype arguments must match the types of the corresponding
18773 nontype template parameters, or must be convertible to the
18774 types of the corresponding nontype parameters as specified in
18775 _temp.arg.nontype_, otherwise type deduction fails.
18777 All references in the function type of the function template
18778 to the corresponding template parameters are replaced by the
18779 specified template argument values. If a substitution in a
18780 template parameter or in the function type of the function
18781 template results in an invalid type, type deduction fails. */
18782 int i
, len
= TREE_VEC_LENGTH (tparms
);
18783 location_t loc
= input_location
;
18784 bool incomplete
= false;
18786 if (explicit_targs
== error_mark_node
)
18789 if (TMPL_ARGS_DEPTH (explicit_targs
)
18790 < TMPL_ARGS_DEPTH (full_targs
))
18791 explicit_targs
= add_outermost_template_args (full_targs
,
18794 /* Adjust any explicit template arguments before entering the
18795 substitution context. */
18797 = (coerce_template_parms (tparms
, explicit_targs
, NULL_TREE
,
18799 /*require_all_args=*/false,
18800 /*use_default_args=*/false));
18801 if (explicit_targs
== error_mark_node
)
18804 /* Substitute the explicit args into the function type. This is
18805 necessary so that, for instance, explicitly declared function
18806 arguments can match null pointed constants. If we were given
18807 an incomplete set of explicit args, we must not do semantic
18808 processing during substitution as we could create partial
18810 for (i
= 0; i
< len
; i
++)
18812 tree parm
= TREE_VALUE (TREE_VEC_ELT (tparms
, i
));
18813 bool parameter_pack
= false;
18814 tree targ
= TREE_VEC_ELT (explicit_targs
, i
);
18816 /* Dig out the actual parm. */
18817 if (TREE_CODE (parm
) == TYPE_DECL
18818 || TREE_CODE (parm
) == TEMPLATE_DECL
)
18820 parm
= TREE_TYPE (parm
);
18821 parameter_pack
= TEMPLATE_TYPE_PARAMETER_PACK (parm
);
18823 else if (TREE_CODE (parm
) == PARM_DECL
)
18825 parm
= DECL_INITIAL (parm
);
18826 parameter_pack
= TEMPLATE_PARM_PARAMETER_PACK (parm
);
18829 if (!parameter_pack
&& targ
== NULL_TREE
)
18830 /* No explicit argument for this template parameter. */
18833 if (parameter_pack
&& pack_deducible_p (parm
, fn
))
18835 /* Mark the argument pack as "incomplete". We could
18836 still deduce more arguments during unification.
18837 We remove this mark in type_unification_real. */
18840 ARGUMENT_PACK_INCOMPLETE_P(targ
) = 1;
18841 ARGUMENT_PACK_EXPLICIT_ARGS (targ
)
18842 = ARGUMENT_PACK_ARGS (targ
);
18845 /* We have some incomplete argument packs. */
18850 TREE_VALUE (tinst
) = explicit_targs
;
18851 if (!push_tinst_level (tinst
))
18853 excessive_deduction_depth
= true;
18856 processing_template_decl
+= incomplete
;
18857 input_location
= DECL_SOURCE_LOCATION (fn
);
18858 /* Ignore any access checks; we'll see them again in
18859 instantiate_template and they might have the wrong
18860 access path at this point. */
18861 push_deferring_access_checks (dk_deferred
);
18862 fntype
= tsubst (TREE_TYPE (fn
), explicit_targs
,
18863 complain
| tf_partial
| tf_fndecl_type
, NULL_TREE
);
18864 pop_deferring_access_checks ();
18865 input_location
= loc
;
18866 processing_template_decl
-= incomplete
;
18867 pop_tinst_level ();
18869 if (fntype
== error_mark_node
)
18872 /* Place the explicitly specified arguments in TARGS. */
18873 explicit_targs
= INNERMOST_TEMPLATE_ARGS (explicit_targs
);
18874 for (i
= NUM_TMPL_ARGS (explicit_targs
); i
--;)
18875 TREE_VEC_ELT (targs
, i
) = TREE_VEC_ELT (explicit_targs
, i
);
18878 /* Never do unification on the 'this' parameter. */
18879 parms
= skip_artificial_parms_for (fn
, TYPE_ARG_TYPES (fntype
));
18881 if (return_type
&& strict
== DEDUCE_CALL
)
18883 /* We're deducing for a call to the result of a template conversion
18884 function. The parms we really want are in return_type. */
18885 if (POINTER_TYPE_P (return_type
))
18886 return_type
= TREE_TYPE (return_type
);
18887 parms
= TYPE_ARG_TYPES (return_type
);
18889 else if (return_type
)
18893 parms
= tree_cons (NULL_TREE
, TREE_TYPE (fntype
), parms
);
18894 new_args
= XALLOCAVEC (tree
, nargs
+ 1);
18895 new_args
[0] = return_type
;
18896 memcpy (new_args
+ 1, args
, nargs
* sizeof (tree
));
18901 /* We allow incomplete unification without an error message here
18902 because the standard doesn't seem to explicitly prohibit it. Our
18903 callers must be ready to deal with unification failures in any
18906 TREE_VALUE (tinst
) = targs
;
18907 /* If we aren't explaining yet, push tinst context so we can see where
18908 any errors (e.g. from class instantiations triggered by instantiation
18909 of default template arguments) come from. If we are explaining, this
18910 context is redundant. */
18911 if (!explain_p
&& !push_tinst_level (tinst
))
18913 excessive_deduction_depth
= true;
18917 /* type_unification_real will pass back any access checks from default
18918 template argument substitution. */
18919 vec
<deferred_access_check
, va_gc
> *checks
;
18922 ok
= !type_unification_real (DECL_INNERMOST_TEMPLATE_PARMS (fn
),
18923 full_targs
, parms
, args
, nargs
, /*subr=*/0,
18924 strict
, flags
, &checks
, explain_p
);
18926 pop_tinst_level ();
18930 /* Now that we have bindings for all of the template arguments,
18931 ensure that the arguments deduced for the template template
18932 parameters have compatible template parameter lists. We cannot
18933 check this property before we have deduced all template
18934 arguments, because the template parameter types of a template
18935 template parameter might depend on prior template parameters
18936 deduced after the template template parameter. The following
18937 ill-formed example illustrates this issue:
18939 template<typename T, template<T> class C> void f(C<5>, T);
18941 template<int N> struct X {};
18944 f(X<5>(), 5l); // error: template argument deduction fails
18947 The template parameter list of 'C' depends on the template type
18948 parameter 'T', but 'C' is deduced to 'X' before 'T' is deduced to
18949 'long'. Thus, we can't check that 'C' cannot bind to 'X' at the
18950 time that we deduce 'C'. */
18951 if (!template_template_parm_bindings_ok_p
18952 (DECL_INNERMOST_TEMPLATE_PARMS (fn
), targs
))
18954 unify_inconsistent_template_template_parameters (explain_p
);
18958 /* All is well so far. Now, check:
18962 When all template arguments have been deduced, all uses of
18963 template parameters in nondeduced contexts are replaced with
18964 the corresponding deduced argument values. If the
18965 substitution results in an invalid type, as described above,
18966 type deduction fails. */
18967 TREE_VALUE (tinst
) = targs
;
18968 if (!push_tinst_level (tinst
))
18970 excessive_deduction_depth
= true;
18974 /* Also collect access checks from the instantiation. */
18975 reopen_deferring_access_checks (checks
);
18977 decl
= instantiate_template (fn
, targs
, complain
);
18979 checks
= get_deferred_access_checks ();
18980 pop_deferring_access_checks ();
18982 pop_tinst_level ();
18984 if (decl
== error_mark_node
)
18987 /* Now perform any access checks encountered during substitution. */
18988 push_access_scope (decl
);
18989 ok
= perform_access_checks (checks
, complain
);
18990 pop_access_scope (decl
);
18994 /* If we're looking for an exact match, check that what we got
18995 is indeed an exact match. It might not be if some template
18996 parameters are used in non-deduced contexts. But don't check
18997 for an exact match if we have dependent template arguments;
18998 in that case we're doing partial ordering, and we already know
18999 that we have two candidates that will provide the actual type. */
19000 if (strict
== DEDUCE_EXACT
&& !any_dependent_template_arguments_p (targs
))
19002 tree substed
= TREE_TYPE (decl
);
19006 = skip_artificial_parms_for (decl
, TYPE_ARG_TYPES (substed
));
19008 sarg
= tree_cons (NULL_TREE
, TREE_TYPE (substed
), sarg
);
19009 for (i
= 0; i
< nargs
&& sarg
; ++i
, sarg
= TREE_CHAIN (sarg
))
19010 if (!same_type_p (args
[i
], TREE_VALUE (sarg
)))
19012 unify_type_mismatch (explain_p
, args
[i
],
19013 TREE_VALUE (sarg
));
19018 /* After doing deduction with the inherited constructor, actually return an
19019 instantiation of the inheriting constructor. */
19021 decl
= instantiate_template (orig_fn
, targs
, complain
);
19027 if (excessive_deduction_depth
)
19029 if (deduction_depth
== 0)
19030 /* Reset once we're all the way out. */
19031 excessive_deduction_depth
= false;
19034 /* We can't free this if a pending_template entry or last_error_tinst_level
19035 is pointing at it. */
19036 if (last_pending_template
== old_last_pend
19037 && last_error_tinst_level
== old_error_tinst
)
19043 /* Adjust types before performing type deduction, as described in
19044 [temp.deduct.call] and [temp.deduct.conv]. The rules in these two
19045 sections are symmetric. PARM is the type of a function parameter
19046 or the return type of the conversion function. ARG is the type of
19047 the argument passed to the call, or the type of the value
19048 initialized with the result of the conversion function.
19049 ARG_EXPR is the original argument expression, which may be null. */
19052 maybe_adjust_types_for_deduction (unification_kind_t strict
,
19065 /* Swap PARM and ARG throughout the remainder of this
19066 function; the handling is precisely symmetric since PARM
19067 will initialize ARG rather than vice versa. */
19068 std::swap (parm
, arg
);
19072 /* Core issue #873: Do the DR606 thing (see below) for these cases,
19073 too, but here handle it by stripping the reference from PARM
19074 rather than by adding it to ARG. */
19075 if (TREE_CODE (*parm
) == REFERENCE_TYPE
19076 && TYPE_REF_IS_RVALUE (*parm
)
19077 && TREE_CODE (TREE_TYPE (*parm
)) == TEMPLATE_TYPE_PARM
19078 && cp_type_quals (TREE_TYPE (*parm
)) == TYPE_UNQUALIFIED
19079 && TREE_CODE (*arg
) == REFERENCE_TYPE
19080 && !TYPE_REF_IS_RVALUE (*arg
))
19081 *parm
= TREE_TYPE (*parm
);
19082 /* Nothing else to do in this case. */
19086 gcc_unreachable ();
19089 if (TREE_CODE (*parm
) != REFERENCE_TYPE
)
19091 /* [temp.deduct.call]
19093 If P is not a reference type:
19095 --If A is an array type, the pointer type produced by the
19096 array-to-pointer standard conversion (_conv.array_) is
19097 used in place of A for type deduction; otherwise,
19099 --If A is a function type, the pointer type produced by
19100 the function-to-pointer standard conversion
19101 (_conv.func_) is used in place of A for type deduction;
19104 --If A is a cv-qualified type, the top level
19105 cv-qualifiers of A's type are ignored for type
19107 if (TREE_CODE (*arg
) == ARRAY_TYPE
)
19108 *arg
= build_pointer_type (TREE_TYPE (*arg
));
19109 else if (TREE_CODE (*arg
) == FUNCTION_TYPE
)
19110 *arg
= build_pointer_type (*arg
);
19112 *arg
= TYPE_MAIN_VARIANT (*arg
);
19115 /* [14.8.2.1/3 temp.deduct.call], "A forwarding reference is an rvalue
19116 reference to a cv-unqualified template parameter that does not represent a
19117 template parameter of a class template (during class template argument
19118 deduction (13.3.1.8)). If P is a forwarding reference and the argument is
19119 an lvalue, the type "lvalue reference to A" is used in place of A for type
19121 if (TREE_CODE (*parm
) == REFERENCE_TYPE
19122 && TYPE_REF_IS_RVALUE (*parm
)
19123 && TREE_CODE (TREE_TYPE (*parm
)) == TEMPLATE_TYPE_PARM
19124 && !TEMPLATE_TYPE_PARM_FOR_CLASS (TREE_TYPE (*parm
))
19125 && cp_type_quals (TREE_TYPE (*parm
)) == TYPE_UNQUALIFIED
19126 && (arg_expr
? lvalue_p (arg_expr
)
19127 /* try_one_overload doesn't provide an arg_expr, but
19128 functions are always lvalues. */
19129 : TREE_CODE (*arg
) == FUNCTION_TYPE
))
19130 *arg
= build_reference_type (*arg
);
19132 /* [temp.deduct.call]
19134 If P is a cv-qualified type, the top level cv-qualifiers
19135 of P's type are ignored for type deduction. If P is a
19136 reference type, the type referred to by P is used for
19138 *parm
= TYPE_MAIN_VARIANT (*parm
);
19139 if (TREE_CODE (*parm
) == REFERENCE_TYPE
)
19141 *parm
= TREE_TYPE (*parm
);
19142 result
|= UNIFY_ALLOW_OUTER_MORE_CV_QUAL
;
19145 /* DR 322. For conversion deduction, remove a reference type on parm
19146 too (which has been swapped into ARG). */
19147 if (strict
== DEDUCE_CONV
&& TREE_CODE (*arg
) == REFERENCE_TYPE
)
19148 *arg
= TREE_TYPE (*arg
);
19153 /* Subroutine of unify_one_argument. PARM is a function parameter of a
19154 template which does contain any deducible template parameters; check if
19155 ARG is a suitable match for it. STRICT, FLAGS and EXPLAIN_P are as in
19156 unify_one_argument. */
19159 check_non_deducible_conversion (tree parm
, tree arg
, int strict
,
19160 int flags
, bool explain_p
)
19165 type
= TREE_TYPE (arg
);
19169 if (same_type_p (parm
, type
))
19170 return unify_success (explain_p
);
19172 if (strict
== DEDUCE_CONV
)
19174 if (can_convert_arg (type
, parm
, NULL_TREE
, flags
,
19175 explain_p
? tf_warning_or_error
: tf_none
))
19176 return unify_success (explain_p
);
19178 else if (strict
!= DEDUCE_EXACT
)
19180 if (can_convert_arg (parm
, type
,
19181 TYPE_P (arg
) ? NULL_TREE
: arg
,
19182 flags
, explain_p
? tf_warning_or_error
: tf_none
))
19183 return unify_success (explain_p
);
19186 if (strict
== DEDUCE_EXACT
)
19187 return unify_type_mismatch (explain_p
, parm
, arg
);
19189 return unify_arg_conversion (explain_p
, parm
, type
, arg
);
19192 static bool uses_deducible_template_parms (tree type
);
19194 /* Returns true iff the expression EXPR is one from which a template
19195 argument can be deduced. In other words, if it's an undecorated
19196 use of a template non-type parameter. */
19199 deducible_expression (tree expr
)
19201 /* Strip implicit conversions. */
19202 while (CONVERT_EXPR_P (expr
))
19203 expr
= TREE_OPERAND (expr
, 0);
19204 return (TREE_CODE (expr
) == TEMPLATE_PARM_INDEX
);
19207 /* Returns true iff the array domain DOMAIN uses a template parameter in a
19208 deducible way; that is, if it has a max value of <PARM> - 1. */
19211 deducible_array_bound (tree domain
)
19213 if (domain
== NULL_TREE
)
19216 tree max
= TYPE_MAX_VALUE (domain
);
19217 if (TREE_CODE (max
) != MINUS_EXPR
)
19220 return deducible_expression (TREE_OPERAND (max
, 0));
19223 /* Returns true iff the template arguments ARGS use a template parameter
19224 in a deducible way. */
19227 deducible_template_args (tree args
)
19229 for (int i
= 0; i
< TREE_VEC_LENGTH (args
); ++i
)
19232 tree elt
= TREE_VEC_ELT (args
, i
);
19233 if (ARGUMENT_PACK_P (elt
))
19234 deducible
= deducible_template_args (ARGUMENT_PACK_ARGS (elt
));
19237 if (PACK_EXPANSION_P (elt
))
19238 elt
= PACK_EXPANSION_PATTERN (elt
);
19239 if (TREE_CODE (elt
) == TEMPLATE_TEMPLATE_PARM
)
19241 else if (TYPE_P (elt
))
19242 deducible
= uses_deducible_template_parms (elt
);
19244 deducible
= deducible_expression (elt
);
19252 /* Returns true iff TYPE contains any deducible references to template
19253 parameters, as per 14.8.2.5. */
19256 uses_deducible_template_parms (tree type
)
19258 if (PACK_EXPANSION_P (type
))
19259 type
= PACK_EXPANSION_PATTERN (type
);
19266 if (TREE_CODE (type
) == TEMPLATE_TYPE_PARM
19267 || TREE_CODE (type
) == BOUND_TEMPLATE_TEMPLATE_PARM
)
19273 if (POINTER_TYPE_P (type
))
19274 return uses_deducible_template_parms (TREE_TYPE (type
));
19276 /* T[integer-constant ]
19278 if (TREE_CODE (type
) == ARRAY_TYPE
)
19279 return (uses_deducible_template_parms (TREE_TYPE (type
))
19280 || deducible_array_bound (TYPE_DOMAIN (type
)));
19292 if (TYPE_PTRMEM_P (type
))
19293 return (uses_deducible_template_parms (TYPE_PTRMEM_CLASS_TYPE (type
))
19294 || (uses_deducible_template_parms
19295 (TYPE_PTRMEM_POINTED_TO_TYPE (type
))));
19297 /* template-name <T> (where template-name refers to a class template)
19298 template-name <i> (where template-name refers to a class template) */
19299 if (CLASS_TYPE_P (type
)
19300 && CLASSTYPE_TEMPLATE_INFO (type
)
19301 && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (type
)))
19302 return deducible_template_args (INNERMOST_TEMPLATE_ARGS
19303 (CLASSTYPE_TI_ARGS (type
)));
19308 if (TREE_CODE (type
) == FUNCTION_TYPE
19309 || TREE_CODE (type
) == METHOD_TYPE
)
19311 if (uses_deducible_template_parms (TREE_TYPE (type
)))
19313 tree parm
= TYPE_ARG_TYPES (type
);
19314 if (TREE_CODE (type
) == METHOD_TYPE
)
19315 parm
= TREE_CHAIN (parm
);
19316 for (; parm
; parm
= TREE_CHAIN (parm
))
19317 if (uses_deducible_template_parms (TREE_VALUE (parm
)))
19324 /* Subroutine of type_unification_real and unify_pack_expansion to
19325 handle unification of a single P/A pair. Parameters are as
19326 for those functions. */
19329 unify_one_argument (tree tparms
, tree targs
, tree parm
, tree arg
,
19330 int subr
, unification_kind_t strict
,
19333 tree arg_expr
= NULL_TREE
;
19336 if (arg
== error_mark_node
|| parm
== error_mark_node
)
19337 return unify_invalid (explain_p
);
19338 if (arg
== unknown_type_node
)
19339 /* We can't deduce anything from this, but we might get all the
19340 template args from other function args. */
19341 return unify_success (explain_p
);
19343 /* Implicit conversions (Clause 4) will be performed on a function
19344 argument to convert it to the type of the corresponding function
19345 parameter if the parameter type contains no template-parameters that
19346 participate in template argument deduction. */
19347 if (strict
!= DEDUCE_EXACT
19348 && TYPE_P (parm
) && !uses_deducible_template_parms (parm
))
19349 /* For function parameters with no deducible template parameters,
19350 just return. We'll check non-dependent conversions later. */
19351 return unify_success (explain_p
);
19356 arg_strict
= (UNIFY_ALLOW_OUTER_LEVEL
19357 | UNIFY_ALLOW_MORE_CV_QUAL
19358 | UNIFY_ALLOW_DERIVED
);
19362 arg_strict
= UNIFY_ALLOW_LESS_CV_QUAL
;
19366 arg_strict
= UNIFY_ALLOW_NONE
;
19370 gcc_unreachable ();
19373 /* We only do these transformations if this is the top-level
19374 parameter_type_list in a call or declaration matching; in other
19375 situations (nested function declarators, template argument lists) we
19376 won't be comparing a type to an expression, and we don't do any type
19382 gcc_assert (TREE_TYPE (arg
) != NULL_TREE
);
19383 if (type_unknown_p (arg
))
19385 /* [temp.deduct.type] A template-argument can be
19386 deduced from a pointer to function or pointer
19387 to member function argument if the set of
19388 overloaded functions does not contain function
19389 templates and at most one of a set of
19390 overloaded functions provides a unique
19392 resolve_overloaded_unification (tparms
, targs
, parm
,
19394 arg_strict
, explain_p
);
19395 /* If a unique match was not found, this is a
19396 non-deduced context, so we still succeed. */
19397 return unify_success (explain_p
);
19401 arg
= unlowered_expr_type (arg
);
19402 if (arg
== error_mark_node
)
19403 return unify_invalid (explain_p
);
19407 maybe_adjust_types_for_deduction (strict
, &parm
, &arg
, arg_expr
);
19410 if ((TYPE_P (parm
) || TREE_CODE (parm
) == TEMPLATE_DECL
)
19411 != (TYPE_P (arg
) || TREE_CODE (arg
) == TEMPLATE_DECL
))
19412 return unify_template_argument_mismatch (explain_p
, parm
, arg
);
19414 /* For deduction from an init-list we need the actual list. */
19415 if (arg_expr
&& BRACE_ENCLOSED_INITIALIZER_P (arg_expr
))
19417 return unify (tparms
, targs
, parm
, arg
, arg_strict
, explain_p
);
19420 /* for_each_template_parm callback that always returns 0. */
19423 zero_r (tree
, void *)
19428 /* for_each_template_parm any_fn callback to handle deduction of a template
19429 type argument from the type of an array bound. */
19432 array_deduction_r (tree t
, void *data
)
19434 tree_pair_p d
= (tree_pair_p
)data
;
19435 tree
&tparms
= d
->purpose
;
19436 tree
&targs
= d
->value
;
19438 if (TREE_CODE (t
) == ARRAY_TYPE
)
19439 if (tree dom
= TYPE_DOMAIN (t
))
19440 if (tree max
= TYPE_MAX_VALUE (dom
))
19442 if (TREE_CODE (max
) == MINUS_EXPR
)
19443 max
= TREE_OPERAND (max
, 0);
19444 if (TREE_CODE (max
) == TEMPLATE_PARM_INDEX
)
19445 unify (tparms
, targs
, TREE_TYPE (max
), size_type_node
,
19446 UNIFY_ALLOW_NONE
, /*explain*/false);
19449 /* Keep walking. */
19453 /* Try to deduce any not-yet-deduced template type arguments from the type of
19454 an array bound. This is handled separately from unify because 14.8.2.5 says
19455 "The type of a type parameter is only deduced from an array bound if it is
19456 not otherwise deduced." */
19459 try_array_deduction (tree tparms
, tree targs
, tree parm
)
19461 tree_pair_s data
= { tparms
, targs
};
19462 hash_set
<tree
> visited
;
19463 for_each_template_parm (parm
, zero_r
, &data
, &visited
,
19464 /*nondeduced*/false, array_deduction_r
);
19467 /* Most parms like fn_type_unification.
19469 If SUBR is 1, we're being called recursively (to unify the
19470 arguments of a function or method parameter of a function
19473 CHECKS is a pointer to a vector of access checks encountered while
19474 substituting default template arguments. */
19477 type_unification_real (tree tparms
,
19481 unsigned int xnargs
,
19483 unification_kind_t strict
,
19485 vec
<deferred_access_check
, va_gc
> **checks
,
19490 int ntparms
= TREE_VEC_LENGTH (tparms
);
19491 int saw_undeduced
= 0;
19494 unsigned int nargs
;
19497 gcc_assert (TREE_CODE (tparms
) == TREE_VEC
);
19498 gcc_assert (xparms
== NULL_TREE
|| TREE_CODE (xparms
) == TREE_LIST
);
19499 gcc_assert (ntparms
> 0);
19501 tree targs
= INNERMOST_TEMPLATE_ARGS (full_targs
);
19503 /* Reset the number of non-defaulted template arguments contained
19505 NON_DEFAULT_TEMPLATE_ARGS_COUNT (targs
) = NULL_TREE
;
19513 while (parms
&& parms
!= void_list_node
19516 parm
= TREE_VALUE (parms
);
19518 if (TREE_CODE (parm
) == TYPE_PACK_EXPANSION
19519 && (!TREE_CHAIN (parms
) || TREE_CHAIN (parms
) == void_list_node
))
19520 /* For a function parameter pack that occurs at the end of the
19521 parameter-declaration-list, the type A of each remaining
19522 argument of the call is compared with the type P of the
19523 declarator-id of the function parameter pack. */
19526 parms
= TREE_CHAIN (parms
);
19528 if (TREE_CODE (parm
) == TYPE_PACK_EXPANSION
)
19529 /* For a function parameter pack that does not occur at the
19530 end of the parameter-declaration-list, the type of the
19531 parameter pack is a non-deduced context. */
19537 if (unify_one_argument (tparms
, full_targs
, parm
, arg
, subr
, strict
,
19543 && parms
!= void_list_node
19544 && TREE_CODE (TREE_VALUE (parms
)) == TYPE_PACK_EXPANSION
)
19546 /* Unify the remaining arguments with the pack expansion type. */
19548 tree parmvec
= make_tree_vec (1);
19550 /* Allocate a TREE_VEC and copy in all of the arguments */
19551 argvec
= make_tree_vec (nargs
- ia
);
19552 for (i
= 0; ia
< nargs
; ++ia
, ++i
)
19553 TREE_VEC_ELT (argvec
, i
) = args
[ia
];
19555 /* Copy the parameter into parmvec. */
19556 TREE_VEC_ELT (parmvec
, 0) = TREE_VALUE (parms
);
19557 if (unify_pack_expansion (tparms
, full_targs
, parmvec
, argvec
, strict
,
19558 /*subr=*/subr
, explain_p
))
19561 /* Advance to the end of the list of parameters. */
19562 parms
= TREE_CHAIN (parms
);
19565 /* Fail if we've reached the end of the parm list, and more args
19566 are present, and the parm list isn't variadic. */
19567 if (ia
< nargs
&& parms
== void_list_node
)
19568 return unify_too_many_arguments (explain_p
, nargs
, ia
);
19569 /* Fail if parms are left and they don't have default values and
19570 they aren't all deduced as empty packs (c++/57397). This is
19571 consistent with sufficient_parms_p. */
19572 if (parms
&& parms
!= void_list_node
19573 && TREE_PURPOSE (parms
) == NULL_TREE
)
19575 unsigned int count
= nargs
;
19580 type_pack_p
= TREE_CODE (TREE_VALUE (p
)) == TYPE_PACK_EXPANSION
;
19583 p
= TREE_CHAIN (p
);
19585 while (p
&& p
!= void_list_node
);
19586 if (count
!= nargs
)
19587 return unify_too_few_arguments (explain_p
, ia
, count
,
19593 tsubst_flags_t complain
= (explain_p
19594 ? tf_warning_or_error
19596 bool tried_array_deduction
= (cxx_dialect
< cxx17
);
19598 for (i
= 0; i
< ntparms
; i
++)
19600 tree targ
= TREE_VEC_ELT (targs
, i
);
19601 tree tparm
= TREE_VEC_ELT (tparms
, i
);
19603 /* Clear the "incomplete" flags on all argument packs now so that
19604 substituting them into later default arguments works. */
19605 if (targ
&& ARGUMENT_PACK_P (targ
))
19607 ARGUMENT_PACK_INCOMPLETE_P (targ
) = 0;
19608 ARGUMENT_PACK_EXPLICIT_ARGS (targ
) = NULL_TREE
;
19611 if (targ
|| tparm
== error_mark_node
)
19613 tparm
= TREE_VALUE (tparm
);
19615 if (TREE_CODE (tparm
) == TYPE_DECL
19616 && !tried_array_deduction
)
19618 try_array_deduction (tparms
, targs
, xparms
);
19619 tried_array_deduction
= true;
19620 if (TREE_VEC_ELT (targs
, i
))
19624 /* If this is an undeduced nontype parameter that depends on
19625 a type parameter, try another pass; its type may have been
19626 deduced from a later argument than the one from which
19627 this parameter can be deduced. */
19628 if (TREE_CODE (tparm
) == PARM_DECL
19629 && uses_template_parms (TREE_TYPE (tparm
))
19630 && saw_undeduced
< 2)
19636 /* Core issue #226 (C++0x) [temp.deduct]:
19638 If a template argument has not been deduced, its
19639 default template argument, if any, is used.
19641 When we are in C++98 mode, TREE_PURPOSE will either
19642 be NULL_TREE or ERROR_MARK_NODE, so we do not need
19643 to explicitly check cxx_dialect here. */
19644 if (TREE_PURPOSE (TREE_VEC_ELT (tparms
, i
)))
19645 /* OK, there is a default argument. Wait until after the
19646 conversion check to do substitution. */
19649 /* If the type parameter is a parameter pack, then it will
19650 be deduced to an empty parameter pack. */
19651 if (template_parameter_pack_p (tparm
))
19655 if (TREE_CODE (tparm
) == TEMPLATE_PARM_INDEX
)
19657 arg
= make_node (NONTYPE_ARGUMENT_PACK
);
19658 TREE_CONSTANT (arg
) = 1;
19661 arg
= cxx_make_type (TYPE_ARGUMENT_PACK
);
19663 SET_ARGUMENT_PACK_ARGS (arg
, make_tree_vec (0));
19665 TREE_VEC_ELT (targs
, i
) = arg
;
19669 return unify_parameter_deduction_failure (explain_p
, tparm
);
19672 /* DR 1391: All parameters have args, now check non-dependent parms for
19674 if (saw_undeduced
< 2)
19675 for (ia
= 0, parms
= xparms
, args
= xargs
, nargs
= xnargs
;
19676 parms
&& parms
!= void_list_node
&& ia
< nargs
; )
19678 parm
= TREE_VALUE (parms
);
19680 if (TREE_CODE (parm
) == TYPE_PACK_EXPANSION
19681 && (!TREE_CHAIN (parms
)
19682 || TREE_CHAIN (parms
) == void_list_node
))
19683 /* For a function parameter pack that occurs at the end of the
19684 parameter-declaration-list, the type A of each remaining
19685 argument of the call is compared with the type P of the
19686 declarator-id of the function parameter pack. */
19689 parms
= TREE_CHAIN (parms
);
19691 if (TREE_CODE (parm
) == TYPE_PACK_EXPANSION
)
19692 /* For a function parameter pack that does not occur at the
19693 end of the parameter-declaration-list, the type of the
19694 parameter pack is a non-deduced context. */
19700 if (uses_template_parms (parm
))
19702 if (check_non_deducible_conversion (parm
, arg
, strict
, flags
,
19707 /* Now substitute into the default template arguments. */
19708 for (i
= 0; i
< ntparms
; i
++)
19710 tree targ
= TREE_VEC_ELT (targs
, i
);
19711 tree tparm
= TREE_VEC_ELT (tparms
, i
);
19713 if (targ
|| tparm
== error_mark_node
)
19715 tree parm
= TREE_VALUE (tparm
);
19717 if (TREE_CODE (parm
) == PARM_DECL
19718 && uses_template_parms (TREE_TYPE (parm
))
19719 && saw_undeduced
< 2)
19722 tree arg
= TREE_PURPOSE (tparm
);
19723 reopen_deferring_access_checks (*checks
);
19724 location_t save_loc
= input_location
;
19726 input_location
= DECL_SOURCE_LOCATION (parm
);
19727 arg
= tsubst_template_arg (arg
, full_targs
, complain
, NULL_TREE
);
19728 if (!uses_template_parms (arg
))
19729 arg
= convert_template_argument (parm
, arg
, full_targs
, complain
,
19731 else if (saw_undeduced
< 2)
19734 arg
= error_mark_node
;
19735 input_location
= save_loc
;
19736 *checks
= get_deferred_access_checks ();
19737 pop_deferring_access_checks ();
19738 if (arg
== error_mark_node
)
19742 TREE_VEC_ELT (targs
, i
) = arg
;
19743 /* The position of the first default template argument,
19744 is also the number of non-defaulted arguments in TARGS.
19746 if (!NON_DEFAULT_TEMPLATE_ARGS_COUNT (targs
))
19747 SET_NON_DEFAULT_TEMPLATE_ARGS_COUNT (targs
, i
);
19751 if (saw_undeduced
++ == 1)
19755 if (CHECKING_P
&& !NON_DEFAULT_TEMPLATE_ARGS_COUNT (targs
))
19756 SET_NON_DEFAULT_TEMPLATE_ARGS_COUNT (targs
, TREE_VEC_LENGTH (targs
));
19758 return unify_success (explain_p
);
19761 /* Subroutine of type_unification_real. Args are like the variables
19762 at the call site. ARG is an overloaded function (or template-id);
19763 we try deducing template args from each of the overloads, and if
19764 only one succeeds, we go with that. Modifies TARGS and returns
19765 true on success. */
19768 resolve_overloaded_unification (tree tparms
,
19772 unification_kind_t strict
,
19776 tree tempargs
= copy_node (targs
);
19778 tree goodfn
= NULL_TREE
;
19781 if (TREE_CODE (arg
) == ADDR_EXPR
)
19783 arg
= TREE_OPERAND (arg
, 0);
19789 if (TREE_CODE (arg
) == COMPONENT_REF
)
19790 /* Handle `&x' where `x' is some static or non-static member
19792 arg
= TREE_OPERAND (arg
, 1);
19794 if (TREE_CODE (arg
) == OFFSET_REF
)
19795 arg
= TREE_OPERAND (arg
, 1);
19797 /* Strip baselink information. */
19798 if (BASELINK_P (arg
))
19799 arg
= BASELINK_FUNCTIONS (arg
);
19801 if (TREE_CODE (arg
) == TEMPLATE_ID_EXPR
)
19803 /* If we got some explicit template args, we need to plug them into
19804 the affected templates before we try to unify, in case the
19805 explicit args will completely resolve the templates in question. */
19808 tree expl_subargs
= TREE_OPERAND (arg
, 1);
19809 arg
= TREE_OPERAND (arg
, 0);
19811 for (lkp_iterator
iter (arg
); iter
; ++iter
)
19814 tree subargs
, elem
;
19816 if (TREE_CODE (fn
) != TEMPLATE_DECL
)
19819 subargs
= coerce_template_parms (DECL_INNERMOST_TEMPLATE_PARMS (fn
),
19820 expl_subargs
, NULL_TREE
, tf_none
,
19821 /*require_all_args=*/true,
19822 /*use_default_args=*/true);
19823 if (subargs
!= error_mark_node
19824 && !any_dependent_template_arguments_p (subargs
))
19826 elem
= TREE_TYPE (instantiate_template (fn
, subargs
, tf_none
));
19827 if (try_one_overload (tparms
, targs
, tempargs
, parm
,
19828 elem
, strict
, sub_strict
, addr_p
, explain_p
)
19829 && (!goodfn
|| !same_type_p (goodfn
, elem
)))
19838 /* If no templates (or more than one) are fully resolved by the
19839 explicit arguments, this template-id is a non-deduced context; it
19840 could still be OK if we deduce all template arguments for the
19841 enclosing call through other arguments. */
19845 else if (TREE_CODE (arg
) != OVERLOAD
19846 && TREE_CODE (arg
) != FUNCTION_DECL
)
19847 /* If ARG is, for example, "(0, &f)" then its type will be unknown
19848 -- but the deduction does not succeed because the expression is
19849 not just the function on its own. */
19852 for (lkp_iterator
iter (arg
); iter
; ++iter
)
19855 if (try_one_overload (tparms
, targs
, tempargs
, parm
, TREE_TYPE (fn
),
19856 strict
, sub_strict
, addr_p
, explain_p
)
19857 && (!goodfn
|| !decls_match (goodfn
, fn
)))
19864 /* [temp.deduct.type] A template-argument can be deduced from a pointer
19865 to function or pointer to member function argument if the set of
19866 overloaded functions does not contain function templates and at most
19867 one of a set of overloaded functions provides a unique match.
19869 So if we found multiple possibilities, we return success but don't
19870 deduce anything. */
19874 int i
= TREE_VEC_LENGTH (targs
);
19876 if (TREE_VEC_ELT (tempargs
, i
))
19878 tree old
= TREE_VEC_ELT (targs
, i
);
19879 tree new_
= TREE_VEC_ELT (tempargs
, i
);
19880 if (new_
&& old
&& ARGUMENT_PACK_P (old
)
19881 && ARGUMENT_PACK_EXPLICIT_ARGS (old
))
19882 /* Don't forget explicit template arguments in a pack. */
19883 ARGUMENT_PACK_EXPLICIT_ARGS (new_
)
19884 = ARGUMENT_PACK_EXPLICIT_ARGS (old
);
19885 TREE_VEC_ELT (targs
, i
) = new_
;
19894 /* Core DR 115: In contexts where deduction is done and fails, or in
19895 contexts where deduction is not done, if a template argument list is
19896 specified and it, along with any default template arguments, identifies
19897 a single function template specialization, then the template-id is an
19898 lvalue for the function template specialization. */
19901 resolve_nondeduced_context (tree orig_expr
, tsubst_flags_t complain
)
19903 tree expr
, offset
, baselink
;
19906 if (!type_unknown_p (orig_expr
))
19911 offset
= NULL_TREE
;
19912 baselink
= NULL_TREE
;
19914 if (TREE_CODE (expr
) == ADDR_EXPR
)
19916 expr
= TREE_OPERAND (expr
, 0);
19919 if (TREE_CODE (expr
) == OFFSET_REF
)
19922 expr
= TREE_OPERAND (expr
, 1);
19924 if (BASELINK_P (expr
))
19927 expr
= BASELINK_FUNCTIONS (expr
);
19930 if (TREE_CODE (expr
) == TEMPLATE_ID_EXPR
)
19933 tree goodfn
= NULL_TREE
;
19935 /* If we got some explicit template args, we need to plug them into
19936 the affected templates before we try to unify, in case the
19937 explicit args will completely resolve the templates in question. */
19939 tree expl_subargs
= TREE_OPERAND (expr
, 1);
19940 tree arg
= TREE_OPERAND (expr
, 0);
19941 tree badfn
= NULL_TREE
;
19942 tree badargs
= NULL_TREE
;
19944 for (lkp_iterator
iter (arg
); iter
; ++iter
)
19947 tree subargs
, elem
;
19949 if (TREE_CODE (fn
) != TEMPLATE_DECL
)
19952 subargs
= coerce_template_parms (DECL_INNERMOST_TEMPLATE_PARMS (fn
),
19953 expl_subargs
, NULL_TREE
, tf_none
,
19954 /*require_all_args=*/true,
19955 /*use_default_args=*/true);
19956 if (subargs
!= error_mark_node
19957 && !any_dependent_template_arguments_p (subargs
))
19959 elem
= instantiate_template (fn
, subargs
, tf_none
);
19960 if (elem
== error_mark_node
)
19965 else if (elem
&& (!goodfn
|| !decls_match (goodfn
, elem
)))
19974 mark_used (goodfn
);
19977 expr
= build_baselink (BASELINK_BINFO (baselink
),
19978 BASELINK_ACCESS_BINFO (baselink
),
19979 expr
, BASELINK_OPTYPE (baselink
));
19983 = TYPE_MAIN_VARIANT (TREE_TYPE (TREE_OPERAND (offset
, 0)));
19984 expr
= build_offset_ref (base
, expr
, addr
, complain
);
19987 expr
= cp_build_addr_expr (expr
, complain
);
19990 else if (good
== 0 && badargs
&& (complain
& tf_error
))
19991 /* There were no good options and at least one bad one, so let the
19992 user know what the problem is. */
19993 instantiate_template (badfn
, badargs
, complain
);
19998 /* Subroutine of resolve_overloaded_unification; does deduction for a single
19999 overload. Fills TARGS with any deduced arguments, or error_mark_node if
20000 different overloads deduce different arguments for a given parm.
20001 ADDR_P is true if the expression for which deduction is being
20002 performed was of the form "& fn" rather than simply "fn".
20004 Returns 1 on success. */
20007 try_one_overload (tree tparms
,
20012 unification_kind_t strict
,
20021 if (arg
== error_mark_node
)
20024 /* [temp.deduct.type] A template-argument can be deduced from a pointer
20025 to function or pointer to member function argument if the set of
20026 overloaded functions does not contain function templates and at most
20027 one of a set of overloaded functions provides a unique match.
20029 So if this is a template, just return success. */
20031 if (uses_template_parms (arg
))
20034 if (TREE_CODE (arg
) == METHOD_TYPE
)
20035 arg
= build_ptrmemfunc_type (build_pointer_type (arg
));
20037 arg
= build_pointer_type (arg
);
20039 sub_strict
|= maybe_adjust_types_for_deduction (strict
, &parm
, &arg
, NULL
);
20041 /* We don't copy orig_targs for this because if we have already deduced
20042 some template args from previous args, unify would complain when we
20043 try to deduce a template parameter for the same argument, even though
20044 there isn't really a conflict. */
20045 nargs
= TREE_VEC_LENGTH (targs
);
20046 tempargs
= make_tree_vec (nargs
);
20048 if (unify (tparms
, tempargs
, parm
, arg
, sub_strict
, explain_p
))
20051 /* First make sure we didn't deduce anything that conflicts with
20052 explicitly specified args. */
20053 for (i
= nargs
; i
--; )
20055 tree elt
= TREE_VEC_ELT (tempargs
, i
);
20056 tree oldelt
= TREE_VEC_ELT (orig_targs
, i
);
20060 else if (uses_template_parms (elt
))
20061 /* Since we're unifying against ourselves, we will fill in
20062 template args used in the function parm list with our own
20063 template parms. Discard them. */
20064 TREE_VEC_ELT (tempargs
, i
) = NULL_TREE
;
20065 else if (oldelt
&& ARGUMENT_PACK_P (oldelt
))
20067 /* Check that the argument at each index of the deduced argument pack
20068 is equivalent to the corresponding explicitly specified argument.
20069 We may have deduced more arguments than were explicitly specified,
20072 /* We used to assert ARGUMENT_PACK_INCOMPLETE_P (oldelt) here, but
20073 that's wrong if we deduce the same argument pack from multiple
20074 function arguments: it's only incomplete the first time. */
20076 tree explicit_pack
= ARGUMENT_PACK_ARGS (oldelt
);
20077 tree deduced_pack
= ARGUMENT_PACK_ARGS (elt
);
20079 if (TREE_VEC_LENGTH (deduced_pack
)
20080 < TREE_VEC_LENGTH (explicit_pack
))
20083 for (int j
= 0; j
< TREE_VEC_LENGTH (explicit_pack
); j
++)
20084 if (!template_args_equal (TREE_VEC_ELT (explicit_pack
, j
),
20085 TREE_VEC_ELT (deduced_pack
, j
)))
20088 else if (oldelt
&& !template_args_equal (oldelt
, elt
))
20092 for (i
= nargs
; i
--; )
20094 tree elt
= TREE_VEC_ELT (tempargs
, i
);
20097 TREE_VEC_ELT (targs
, i
) = elt
;
20103 /* PARM is a template class (perhaps with unbound template
20104 parameters). ARG is a fully instantiated type. If ARG can be
20105 bound to PARM, return ARG, otherwise return NULL_TREE. TPARMS and
20106 TARGS are as for unify. */
20109 try_class_unification (tree tparms
, tree targs
, tree parm
, tree arg
,
20112 tree copy_of_targs
;
20114 if (!CLASSTYPE_SPECIALIZATION_OF_PRIMARY_TEMPLATE_P (arg
))
20116 else if (TREE_CODE (parm
) == BOUND_TEMPLATE_TEMPLATE_PARM
)
20117 /* Matches anything. */;
20118 else if (most_general_template (CLASSTYPE_TI_TEMPLATE (arg
))
20119 != most_general_template (CLASSTYPE_TI_TEMPLATE (parm
)))
20122 /* We need to make a new template argument vector for the call to
20123 unify. If we used TARGS, we'd clutter it up with the result of
20124 the attempted unification, even if this class didn't work out.
20125 We also don't want to commit ourselves to all the unifications
20126 we've already done, since unification is supposed to be done on
20127 an argument-by-argument basis. In other words, consider the
20128 following pathological case:
20130 template <int I, int J, int K>
20133 template <int I, int J>
20134 struct S<I, J, 2> : public S<I, I, I>, S<J, J, J> {};
20136 template <int I, int J, int K>
20137 void f(S<I, J, K>, S<I, I, I>);
20146 Now, by the time we consider the unification involving `s2', we
20147 already know that we must have `f<0, 0, 0>'. But, even though
20148 `S<0, 1, 2>' is derived from `S<0, 0, 0>', the code is invalid
20149 because there are two ways to unify base classes of S<0, 1, 2>
20150 with S<I, I, I>. If we kept the already deduced knowledge, we
20151 would reject the possibility I=1. */
20152 copy_of_targs
= make_tree_vec (TREE_VEC_LENGTH (targs
));
20154 if (TREE_CODE (parm
) == BOUND_TEMPLATE_TEMPLATE_PARM
)
20156 if (unify_bound_ttp_args (tparms
, copy_of_targs
, parm
, arg
, explain_p
))
20161 /* If unification failed, we're done. */
20162 if (unify (tparms
, copy_of_targs
, CLASSTYPE_TI_ARGS (parm
),
20163 CLASSTYPE_TI_ARGS (arg
), UNIFY_ALLOW_NONE
, explain_p
))
20169 /* Given a template type PARM and a class type ARG, find the unique
20170 base type in ARG that is an instance of PARM. We do not examine
20171 ARG itself; only its base-classes. If there is not exactly one
20172 appropriate base class, return NULL_TREE. PARM may be the type of
20173 a partial specialization, as well as a plain template type. Used
20176 static enum template_base_result
20177 get_template_base (tree tparms
, tree targs
, tree parm
, tree arg
,
20178 bool explain_p
, tree
*result
)
20180 tree rval
= NULL_TREE
;
20183 gcc_assert (RECORD_OR_UNION_CODE_P (TREE_CODE (arg
)));
20185 binfo
= TYPE_BINFO (complete_type (arg
));
20188 /* The type could not be completed. */
20189 *result
= NULL_TREE
;
20190 return tbr_incomplete_type
;
20193 /* Walk in inheritance graph order. The search order is not
20194 important, and this avoids multiple walks of virtual bases. */
20195 for (binfo
= TREE_CHAIN (binfo
); binfo
; binfo
= TREE_CHAIN (binfo
))
20197 tree r
= try_class_unification (tparms
, targs
, parm
,
20198 BINFO_TYPE (binfo
), explain_p
);
20202 /* If there is more than one satisfactory baseclass, then:
20206 If they yield more than one possible deduced A, the type
20210 if (rval
&& !same_type_p (r
, rval
))
20212 *result
= NULL_TREE
;
20213 return tbr_ambiguous_baseclass
;
20221 return tbr_success
;
20224 /* Returns the level of DECL, which declares a template parameter. */
20227 template_decl_level (tree decl
)
20229 switch (TREE_CODE (decl
))
20232 case TEMPLATE_DECL
:
20233 return TEMPLATE_TYPE_LEVEL (TREE_TYPE (decl
));
20236 return TEMPLATE_PARM_LEVEL (DECL_INITIAL (decl
));
20239 gcc_unreachable ();
20244 /* Decide whether ARG can be unified with PARM, considering only the
20245 cv-qualifiers of each type, given STRICT as documented for unify.
20246 Returns nonzero iff the unification is OK on that basis. */
20249 check_cv_quals_for_unify (int strict
, tree arg
, tree parm
)
20251 int arg_quals
= cp_type_quals (arg
);
20252 int parm_quals
= cp_type_quals (parm
);
20254 if (TREE_CODE (parm
) == TEMPLATE_TYPE_PARM
20255 && !(strict
& UNIFY_ALLOW_OUTER_MORE_CV_QUAL
))
20257 /* Although a CVR qualifier is ignored when being applied to a
20258 substituted template parameter ([8.3.2]/1 for example), that
20259 does not allow us to unify "const T" with "int&" because both
20260 types are not of the form "cv-list T" [14.8.2.5 temp.deduct.type].
20261 It is ok when we're allowing additional CV qualifiers
20262 at the outer level [14.8.2.1]/3,1st bullet. */
20263 if ((TREE_CODE (arg
) == REFERENCE_TYPE
20264 || TREE_CODE (arg
) == FUNCTION_TYPE
20265 || TREE_CODE (arg
) == METHOD_TYPE
)
20266 && (parm_quals
& (TYPE_QUAL_CONST
| TYPE_QUAL_VOLATILE
)))
20269 if ((!POINTER_TYPE_P (arg
) && TREE_CODE (arg
) != TEMPLATE_TYPE_PARM
)
20270 && (parm_quals
& TYPE_QUAL_RESTRICT
))
20274 if (!(strict
& (UNIFY_ALLOW_MORE_CV_QUAL
| UNIFY_ALLOW_OUTER_MORE_CV_QUAL
))
20275 && (arg_quals
& parm_quals
) != parm_quals
)
20278 if (!(strict
& (UNIFY_ALLOW_LESS_CV_QUAL
| UNIFY_ALLOW_OUTER_LESS_CV_QUAL
))
20279 && (parm_quals
& arg_quals
) != arg_quals
)
20285 /* Determines the LEVEL and INDEX for the template parameter PARM. */
20287 template_parm_level_and_index (tree parm
, int* level
, int* index
)
20289 if (TREE_CODE (parm
) == TEMPLATE_TYPE_PARM
20290 || TREE_CODE (parm
) == TEMPLATE_TEMPLATE_PARM
20291 || TREE_CODE (parm
) == BOUND_TEMPLATE_TEMPLATE_PARM
)
20293 *index
= TEMPLATE_TYPE_IDX (parm
);
20294 *level
= TEMPLATE_TYPE_LEVEL (parm
);
20298 *index
= TEMPLATE_PARM_IDX (parm
);
20299 *level
= TEMPLATE_PARM_LEVEL (parm
);
20303 #define RECUR_AND_CHECK_FAILURE(TP, TA, P, A, S, EP) \
20305 if (unify (TP, TA, P, A, S, EP)) \
20309 /* Unifies the remaining arguments in PACKED_ARGS with the pack
20310 expansion at the end of PACKED_PARMS. Returns 0 if the type
20311 deduction succeeds, 1 otherwise. STRICT is the same as in
20312 fn_type_unification. CALL_ARGS_P is true iff PACKED_ARGS is actually a
20313 function call argument list. We'll need to adjust the arguments to make them
20314 types. SUBR tells us if this is from a recursive call to
20315 type_unification_real, or for comparing two template argument
20319 unify_pack_expansion (tree tparms
, tree targs
, tree packed_parms
,
20320 tree packed_args
, unification_kind_t strict
,
20321 bool subr
, bool explain_p
)
20324 = TREE_VEC_ELT (packed_parms
, TREE_VEC_LENGTH (packed_parms
) - 1);
20325 tree pattern
= PACK_EXPANSION_PATTERN (parm
);
20326 tree pack
, packs
= NULL_TREE
;
20327 int i
, start
= TREE_VEC_LENGTH (packed_parms
) - 1;
20329 /* Add in any args remembered from an earlier partial instantiation. */
20330 targs
= add_to_template_args (PACK_EXPANSION_EXTRA_ARGS (parm
), targs
);
20332 packed_args
= expand_template_argument_pack (packed_args
);
20334 int len
= TREE_VEC_LENGTH (packed_args
);
20336 /* Determine the parameter packs we will be deducing from the
20337 pattern, and record their current deductions. */
20338 for (pack
= PACK_EXPANSION_PARAMETER_PACKS (parm
);
20339 pack
; pack
= TREE_CHAIN (pack
))
20341 tree parm_pack
= TREE_VALUE (pack
);
20344 /* Determine the index and level of this parameter pack. */
20345 template_parm_level_and_index (parm_pack
, &level
, &idx
);
20347 /* Keep track of the parameter packs and their corresponding
20349 packs
= tree_cons (parm_pack
, TMPL_ARG (targs
, level
, idx
), packs
);
20350 TREE_TYPE (packs
) = make_tree_vec (len
- start
);
20353 /* Loop through all of the arguments that have not yet been
20354 unified and unify each with the pattern. */
20355 for (i
= start
; i
< len
; i
++)
20358 bool any_explicit
= false;
20359 tree arg
= TREE_VEC_ELT (packed_args
, i
);
20361 /* For each parameter pack, set its TMPL_ARG to either NULL_TREE
20362 or the element of its argument pack at the current index if
20363 this argument was explicitly specified. */
20364 for (pack
= packs
; pack
; pack
= TREE_CHAIN (pack
))
20368 template_parm_level_and_index (TREE_PURPOSE (pack
), &level
, &idx
);
20371 if (TREE_VALUE (pack
)
20372 && (pargs
= ARGUMENT_PACK_EXPLICIT_ARGS (TREE_VALUE (pack
)))
20373 && (i
- start
< TREE_VEC_LENGTH (pargs
)))
20375 any_explicit
= true;
20376 arg
= TREE_VEC_ELT (pargs
, i
- start
);
20378 TMPL_ARG (targs
, level
, idx
) = arg
;
20381 /* If we had explicit template arguments, substitute them into the
20382 pattern before deduction. */
20385 /* Some arguments might still be unspecified or dependent. */
20387 ++processing_template_decl
;
20388 dependent
= any_dependent_template_arguments_p (targs
);
20390 --processing_template_decl
;
20391 parm
= tsubst (pattern
, targs
,
20392 explain_p
? tf_warning_or_error
: tf_none
,
20395 --processing_template_decl
;
20396 if (parm
== error_mark_node
)
20402 /* Unify the pattern with the current argument. */
20403 if (unify_one_argument (tparms
, targs
, parm
, arg
, subr
, strict
,
20407 /* For each parameter pack, collect the deduced value. */
20408 for (pack
= packs
; pack
; pack
= TREE_CHAIN (pack
))
20411 template_parm_level_and_index (TREE_PURPOSE (pack
), &level
, &idx
);
20413 TREE_VEC_ELT (TREE_TYPE (pack
), i
- start
) =
20414 TMPL_ARG (targs
, level
, idx
);
20418 /* Verify that the results of unification with the parameter packs
20419 produce results consistent with what we've seen before, and make
20420 the deduced argument packs available. */
20421 for (pack
= packs
; pack
; pack
= TREE_CHAIN (pack
))
20423 tree old_pack
= TREE_VALUE (pack
);
20424 tree new_args
= TREE_TYPE (pack
);
20425 int i
, len
= TREE_VEC_LENGTH (new_args
);
20427 bool nondeduced_p
= false;
20429 /* By default keep the original deduced argument pack.
20430 If necessary, more specific code is going to update the
20431 resulting deduced argument later down in this function. */
20432 template_parm_level_and_index (TREE_PURPOSE (pack
), &level
, &idx
);
20433 TMPL_ARG (targs
, level
, idx
) = old_pack
;
20435 /* If NEW_ARGS contains any NULL_TREE entries, we didn't
20436 actually deduce anything. */
20437 for (i
= 0; i
< len
&& !nondeduced_p
; ++i
)
20438 if (TREE_VEC_ELT (new_args
, i
) == NULL_TREE
)
20439 nondeduced_p
= true;
20443 if (old_pack
&& ARGUMENT_PACK_INCOMPLETE_P (old_pack
))
20445 /* If we had fewer function args than explicit template args,
20446 just use the explicits. */
20447 tree explicit_args
= ARGUMENT_PACK_EXPLICIT_ARGS (old_pack
);
20448 int explicit_len
= TREE_VEC_LENGTH (explicit_args
);
20449 if (len
< explicit_len
)
20450 new_args
= explicit_args
;
20456 /* Build the deduced *_ARGUMENT_PACK. */
20457 if (TREE_CODE (TREE_PURPOSE (pack
)) == TEMPLATE_PARM_INDEX
)
20459 result
= make_node (NONTYPE_ARGUMENT_PACK
);
20460 TREE_CONSTANT (result
) = 1;
20463 result
= cxx_make_type (TYPE_ARGUMENT_PACK
);
20465 SET_ARGUMENT_PACK_ARGS (result
, new_args
);
20467 /* Note the deduced argument packs for this parameter
20469 TMPL_ARG (targs
, level
, idx
) = result
;
20471 else if (ARGUMENT_PACK_INCOMPLETE_P (old_pack
)
20472 && (ARGUMENT_PACK_ARGS (old_pack
)
20473 == ARGUMENT_PACK_EXPLICIT_ARGS (old_pack
)))
20475 /* We only had the explicitly-provided arguments before, but
20476 now we have a complete set of arguments. */
20477 tree explicit_args
= ARGUMENT_PACK_EXPLICIT_ARGS (old_pack
);
20479 SET_ARGUMENT_PACK_ARGS (old_pack
, new_args
);
20480 ARGUMENT_PACK_INCOMPLETE_P (old_pack
) = 1;
20481 ARGUMENT_PACK_EXPLICIT_ARGS (old_pack
) = explicit_args
;
20485 tree bad_old_arg
= NULL_TREE
, bad_new_arg
= NULL_TREE
;
20486 tree old_args
= ARGUMENT_PACK_ARGS (old_pack
);
20488 if (!comp_template_args (old_args
, new_args
,
20489 &bad_old_arg
, &bad_new_arg
))
20490 /* Inconsistent unification of this parameter pack. */
20491 return unify_parameter_pack_inconsistent (explain_p
,
20497 return unify_success (explain_p
);
20500 /* Handle unification of the domain of an array. PARM_DOM and ARG_DOM are
20501 INTEGER_TYPEs representing the TYPE_DOMAIN of ARRAY_TYPEs. The other
20502 parameters and return value are as for unify. */
20505 unify_array_domain (tree tparms
, tree targs
,
20506 tree parm_dom
, tree arg_dom
,
20514 /* Our representation of array types uses "N - 1" as the
20515 TYPE_MAX_VALUE for an array with "N" elements, if "N" is
20516 not an integer constant. We cannot unify arbitrarily
20517 complex expressions, so we eliminate the MINUS_EXPRs
20519 parm_max
= TYPE_MAX_VALUE (parm_dom
);
20520 parm_cst
= TREE_CODE (parm_max
) == INTEGER_CST
;
20523 gcc_assert (TREE_CODE (parm_max
) == MINUS_EXPR
);
20524 parm_max
= TREE_OPERAND (parm_max
, 0);
20526 arg_max
= TYPE_MAX_VALUE (arg_dom
);
20527 arg_cst
= TREE_CODE (arg_max
) == INTEGER_CST
;
20530 /* The ARG_MAX may not be a simple MINUS_EXPR, if we are
20531 trying to unify the type of a variable with the type
20532 of a template parameter. For example:
20534 template <unsigned int N>
20535 void f (char (&) [N]);
20542 Here, the type of the ARG will be "int [g(i)]", and
20543 may be a SAVE_EXPR, etc. */
20544 if (TREE_CODE (arg_max
) != MINUS_EXPR
)
20545 return unify_vla_arg (explain_p
, arg_dom
);
20546 arg_max
= TREE_OPERAND (arg_max
, 0);
20549 /* If only one of the bounds used a MINUS_EXPR, compensate
20550 by adding one to the other bound. */
20551 if (parm_cst
&& !arg_cst
)
20552 parm_max
= fold_build2_loc (input_location
, PLUS_EXPR
,
20556 else if (arg_cst
&& !parm_cst
)
20557 arg_max
= fold_build2_loc (input_location
, PLUS_EXPR
,
20562 return unify (tparms
, targs
, parm_max
, arg_max
,
20563 UNIFY_ALLOW_INTEGER
, explain_p
);
20566 /* Returns whether T, a P or A in unify, is a type, template or expression. */
20568 enum pa_kind_t
{ pa_type
, pa_tmpl
, pa_expr
};
20573 if (PACK_EXPANSION_P (t
))
20574 t
= PACK_EXPANSION_PATTERN (t
);
20575 if (TREE_CODE (t
) == TEMPLATE_TEMPLATE_PARM
20576 || TREE_CODE (t
) == UNBOUND_CLASS_TEMPLATE
20577 || DECL_TYPE_TEMPLATE_P (t
))
20579 else if (TYPE_P (t
))
20585 /* Deduce the value of template parameters. TPARMS is the (innermost)
20586 set of template parameters to a template. TARGS is the bindings
20587 for those template parameters, as determined thus far; TARGS may
20588 include template arguments for outer levels of template parameters
20589 as well. PARM is a parameter to a template function, or a
20590 subcomponent of that parameter; ARG is the corresponding argument.
20591 This function attempts to match PARM with ARG in a manner
20592 consistent with the existing assignments in TARGS. If more values
20593 are deduced, then TARGS is updated.
20595 Returns 0 if the type deduction succeeds, 1 otherwise. The
20596 parameter STRICT is a bitwise or of the following flags:
20599 Require an exact match between PARM and ARG.
20600 UNIFY_ALLOW_MORE_CV_QUAL:
20601 Allow the deduced ARG to be more cv-qualified (by qualification
20602 conversion) than ARG.
20603 UNIFY_ALLOW_LESS_CV_QUAL:
20604 Allow the deduced ARG to be less cv-qualified than ARG.
20605 UNIFY_ALLOW_DERIVED:
20606 Allow the deduced ARG to be a template base class of ARG,
20607 or a pointer to a template base class of the type pointed to by
20609 UNIFY_ALLOW_INTEGER:
20610 Allow any integral type to be deduced. See the TEMPLATE_PARM_INDEX
20611 case for more information.
20612 UNIFY_ALLOW_OUTER_LEVEL:
20613 This is the outermost level of a deduction. Used to determine validity
20614 of qualification conversions. A valid qualification conversion must
20615 have const qualified pointers leading up to the inner type which
20616 requires additional CV quals, except at the outer level, where const
20617 is not required [conv.qual]. It would be normal to set this flag in
20618 addition to setting UNIFY_ALLOW_MORE_CV_QUAL.
20619 UNIFY_ALLOW_OUTER_MORE_CV_QUAL:
20620 This is the outermost level of a deduction, and PARM can be more CV
20621 qualified at this point.
20622 UNIFY_ALLOW_OUTER_LESS_CV_QUAL:
20623 This is the outermost level of a deduction, and PARM can be less CV
20624 qualified at this point. */
20627 unify (tree tparms
, tree targs
, tree parm
, tree arg
, int strict
,
20633 int strict_in
= strict
;
20634 tsubst_flags_t complain
= (explain_p
20635 ? tf_warning_or_error
20638 /* I don't think this will do the right thing with respect to types.
20639 But the only case I've seen it in so far has been array bounds, where
20640 signedness is the only information lost, and I think that will be
20642 while (CONVERT_EXPR_P (parm
))
20643 parm
= TREE_OPERAND (parm
, 0);
20645 if (arg
== error_mark_node
)
20646 return unify_invalid (explain_p
);
20647 if (arg
== unknown_type_node
20648 || arg
== init_list_type_node
)
20649 /* We can't deduce anything from this, but we might get all the
20650 template args from other function args. */
20651 return unify_success (explain_p
);
20653 if (parm
== any_targ_node
|| arg
== any_targ_node
)
20654 return unify_success (explain_p
);
20656 /* If PARM uses template parameters, then we can't bail out here,
20657 even if ARG == PARM, since we won't record unifications for the
20658 template parameters. We might need them if we're trying to
20659 figure out which of two things is more specialized. */
20660 if (arg
== parm
&& !uses_template_parms (parm
))
20661 return unify_success (explain_p
);
20663 /* Handle init lists early, so the rest of the function can assume
20664 we're dealing with a type. */
20665 if (BRACE_ENCLOSED_INITIALIZER_P (arg
))
20669 tree orig_parm
= parm
;
20671 /* Replace T with std::initializer_list<T> for deduction. */
20672 if (TREE_CODE (parm
) == TEMPLATE_TYPE_PARM
20673 && flag_deduce_init_list
)
20674 parm
= listify (parm
);
20676 if (!is_std_init_list (parm
)
20677 && TREE_CODE (parm
) != ARRAY_TYPE
)
20678 /* We can only deduce from an initializer list argument if the
20679 parameter is std::initializer_list or an array; otherwise this
20680 is a non-deduced context. */
20681 return unify_success (explain_p
);
20683 if (TREE_CODE (parm
) == ARRAY_TYPE
)
20684 elttype
= TREE_TYPE (parm
);
20687 elttype
= TREE_VEC_ELT (CLASSTYPE_TI_ARGS (parm
), 0);
20688 /* Deduction is defined in terms of a single type, so just punt
20689 on the (bizarre) std::initializer_list<T...>. */
20690 if (PACK_EXPANSION_P (elttype
))
20691 return unify_success (explain_p
);
20694 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (arg
), i
, elt
)
20696 int elt_strict
= strict
;
20698 if (elt
== error_mark_node
)
20699 return unify_invalid (explain_p
);
20701 if (!BRACE_ENCLOSED_INITIALIZER_P (elt
))
20703 tree type
= TREE_TYPE (elt
);
20704 if (type
== error_mark_node
)
20705 return unify_invalid (explain_p
);
20706 /* It should only be possible to get here for a call. */
20707 gcc_assert (elt_strict
& UNIFY_ALLOW_OUTER_LEVEL
);
20708 elt_strict
|= maybe_adjust_types_for_deduction
20709 (DEDUCE_CALL
, &elttype
, &type
, elt
);
20713 RECUR_AND_CHECK_FAILURE (tparms
, targs
, elttype
, elt
, elt_strict
,
20717 if (TREE_CODE (parm
) == ARRAY_TYPE
20718 && deducible_array_bound (TYPE_DOMAIN (parm
)))
20720 /* Also deduce from the length of the initializer list. */
20721 tree max
= size_int (CONSTRUCTOR_NELTS (arg
));
20722 tree idx
= compute_array_index_type (NULL_TREE
, max
, tf_none
);
20723 if (idx
== error_mark_node
)
20724 return unify_invalid (explain_p
);
20725 return unify_array_domain (tparms
, targs
, TYPE_DOMAIN (parm
),
20729 /* If the std::initializer_list<T> deduction worked, replace the
20730 deduced A with std::initializer_list<A>. */
20731 if (orig_parm
!= parm
)
20733 idx
= TEMPLATE_TYPE_IDX (orig_parm
);
20734 targ
= TREE_VEC_ELT (INNERMOST_TEMPLATE_ARGS (targs
), idx
);
20735 targ
= listify (targ
);
20736 TREE_VEC_ELT (INNERMOST_TEMPLATE_ARGS (targs
), idx
) = targ
;
20738 return unify_success (explain_p
);
20741 /* If parm and arg aren't the same kind of thing (template, type, or
20742 expression), fail early. */
20743 if (pa_kind (parm
) != pa_kind (arg
))
20744 return unify_invalid (explain_p
);
20746 /* Immediately reject some pairs that won't unify because of
20747 cv-qualification mismatches. */
20748 if (TREE_CODE (arg
) == TREE_CODE (parm
)
20750 /* It is the elements of the array which hold the cv quals of an array
20751 type, and the elements might be template type parms. We'll check
20752 when we recurse. */
20753 && TREE_CODE (arg
) != ARRAY_TYPE
20754 /* We check the cv-qualifiers when unifying with template type
20755 parameters below. We want to allow ARG `const T' to unify with
20756 PARM `T' for example, when computing which of two templates
20757 is more specialized, for example. */
20758 && TREE_CODE (arg
) != TEMPLATE_TYPE_PARM
20759 && !check_cv_quals_for_unify (strict_in
, arg
, parm
))
20760 return unify_cv_qual_mismatch (explain_p
, parm
, arg
);
20762 if (!(strict
& UNIFY_ALLOW_OUTER_LEVEL
)
20763 && TYPE_P (parm
) && !CP_TYPE_CONST_P (parm
))
20764 strict
&= ~UNIFY_ALLOW_MORE_CV_QUAL
;
20765 strict
&= ~UNIFY_ALLOW_OUTER_LEVEL
;
20766 strict
&= ~UNIFY_ALLOW_DERIVED
;
20767 strict
&= ~UNIFY_ALLOW_OUTER_MORE_CV_QUAL
;
20768 strict
&= ~UNIFY_ALLOW_OUTER_LESS_CV_QUAL
;
20770 switch (TREE_CODE (parm
))
20772 case TYPENAME_TYPE
:
20774 case UNBOUND_CLASS_TEMPLATE
:
20775 /* In a type which contains a nested-name-specifier, template
20776 argument values cannot be deduced for template parameters used
20777 within the nested-name-specifier. */
20778 return unify_success (explain_p
);
20780 case TEMPLATE_TYPE_PARM
:
20781 case TEMPLATE_TEMPLATE_PARM
:
20782 case BOUND_TEMPLATE_TEMPLATE_PARM
:
20783 tparm
= TREE_VALUE (TREE_VEC_ELT (tparms
, 0));
20784 if (error_operand_p (tparm
))
20785 return unify_invalid (explain_p
);
20787 if (TEMPLATE_TYPE_LEVEL (parm
)
20788 != template_decl_level (tparm
))
20789 /* The PARM is not one we're trying to unify. Just check
20790 to see if it matches ARG. */
20792 if (TREE_CODE (arg
) == TREE_CODE (parm
)
20793 && (is_auto (parm
) ? is_auto (arg
)
20794 : same_type_p (parm
, arg
)))
20795 return unify_success (explain_p
);
20797 return unify_type_mismatch (explain_p
, parm
, arg
);
20799 idx
= TEMPLATE_TYPE_IDX (parm
);
20800 targ
= TREE_VEC_ELT (INNERMOST_TEMPLATE_ARGS (targs
), idx
);
20801 tparm
= TREE_VALUE (TREE_VEC_ELT (tparms
, idx
));
20802 if (error_operand_p (tparm
))
20803 return unify_invalid (explain_p
);
20805 /* Check for mixed types and values. */
20806 if ((TREE_CODE (parm
) == TEMPLATE_TYPE_PARM
20807 && TREE_CODE (tparm
) != TYPE_DECL
)
20808 || (TREE_CODE (parm
) == TEMPLATE_TEMPLATE_PARM
20809 && TREE_CODE (tparm
) != TEMPLATE_DECL
))
20810 gcc_unreachable ();
20812 if (TREE_CODE (parm
) == BOUND_TEMPLATE_TEMPLATE_PARM
)
20814 if ((strict_in
& UNIFY_ALLOW_DERIVED
)
20815 && CLASS_TYPE_P (arg
))
20817 /* First try to match ARG directly. */
20818 tree t
= try_class_unification (tparms
, targs
, parm
, arg
,
20822 /* Otherwise, look for a suitable base of ARG, as below. */
20823 enum template_base_result r
;
20824 r
= get_template_base (tparms
, targs
, parm
, arg
,
20827 return unify_no_common_base (explain_p
, r
, parm
, arg
);
20831 /* ARG must be constructed from a template class or a template
20832 template parameter. */
20833 else if (TREE_CODE (arg
) != BOUND_TEMPLATE_TEMPLATE_PARM
20834 && !CLASSTYPE_SPECIALIZATION_OF_PRIMARY_TEMPLATE_P (arg
))
20835 return unify_template_deduction_failure (explain_p
, parm
, arg
);
20837 /* Deduce arguments T, i from TT<T> or TT<i>. */
20838 if (unify_bound_ttp_args (tparms
, targs
, parm
, arg
, explain_p
))
20841 arg
= TYPE_TI_TEMPLATE (arg
);
20843 /* Fall through to deduce template name. */
20846 if (TREE_CODE (parm
) == TEMPLATE_TEMPLATE_PARM
20847 || TREE_CODE (parm
) == BOUND_TEMPLATE_TEMPLATE_PARM
)
20849 /* Deduce template name TT from TT, TT<>, TT<T> and TT<i>. */
20851 /* Simple cases: Value already set, does match or doesn't. */
20852 if (targ
!= NULL_TREE
&& template_args_equal (targ
, arg
))
20853 return unify_success (explain_p
);
20855 return unify_inconsistency (explain_p
, parm
, targ
, arg
);
20859 /* If PARM is `const T' and ARG is only `int', we don't have
20860 a match unless we are allowing additional qualification.
20861 If ARG is `const int' and PARM is just `T' that's OK;
20862 that binds `const int' to `T'. */
20863 if (!check_cv_quals_for_unify (strict_in
| UNIFY_ALLOW_LESS_CV_QUAL
,
20865 return unify_cv_qual_mismatch (explain_p
, parm
, arg
);
20867 /* Consider the case where ARG is `const volatile int' and
20868 PARM is `const T'. Then, T should be `volatile int'. */
20869 arg
= cp_build_qualified_type_real
20870 (arg
, cp_type_quals (arg
) & ~cp_type_quals (parm
), tf_none
);
20871 if (arg
== error_mark_node
)
20872 return unify_invalid (explain_p
);
20874 /* Simple cases: Value already set, does match or doesn't. */
20875 if (targ
!= NULL_TREE
&& same_type_p (targ
, arg
))
20876 return unify_success (explain_p
);
20878 return unify_inconsistency (explain_p
, parm
, targ
, arg
);
20880 /* Make sure that ARG is not a variable-sized array. (Note
20881 that were talking about variable-sized arrays (like
20882 `int[n]'), rather than arrays of unknown size (like
20883 `int[]').) We'll get very confused by such a type since
20884 the bound of the array is not constant, and therefore
20885 not mangleable. Besides, such types are not allowed in
20886 ISO C++, so we can do as we please here. We do allow
20887 them for 'auto' deduction, since that isn't ABI-exposed. */
20888 if (!is_auto (parm
) && variably_modified_type_p (arg
, NULL_TREE
))
20889 return unify_vla_arg (explain_p
, arg
);
20891 /* Strip typedefs as in convert_template_argument. */
20892 arg
= canonicalize_type_argument (arg
, tf_none
);
20895 /* If ARG is a parameter pack or an expansion, we cannot unify
20896 against it unless PARM is also a parameter pack. */
20897 if ((template_parameter_pack_p (arg
) || PACK_EXPANSION_P (arg
))
20898 && !template_parameter_pack_p (parm
))
20899 return unify_parameter_pack_mismatch (explain_p
, parm
, arg
);
20901 /* If the argument deduction results is a METHOD_TYPE,
20902 then there is a problem.
20903 METHOD_TYPE doesn't map to any real C++ type the result of
20904 the deduction can not be of that type. */
20905 if (TREE_CODE (arg
) == METHOD_TYPE
)
20906 return unify_method_type_error (explain_p
, arg
);
20908 TREE_VEC_ELT (INNERMOST_TEMPLATE_ARGS (targs
), idx
) = arg
;
20909 return unify_success (explain_p
);
20911 case TEMPLATE_PARM_INDEX
:
20912 tparm
= TREE_VALUE (TREE_VEC_ELT (tparms
, 0));
20913 if (error_operand_p (tparm
))
20914 return unify_invalid (explain_p
);
20916 if (TEMPLATE_PARM_LEVEL (parm
)
20917 != template_decl_level (tparm
))
20919 /* The PARM is not one we're trying to unify. Just check
20920 to see if it matches ARG. */
20921 int result
= !(TREE_CODE (arg
) == TREE_CODE (parm
)
20922 && cp_tree_equal (parm
, arg
));
20924 unify_expression_unequal (explain_p
, parm
, arg
);
20928 idx
= TEMPLATE_PARM_IDX (parm
);
20929 targ
= TREE_VEC_ELT (INNERMOST_TEMPLATE_ARGS (targs
), idx
);
20933 if ((strict
& UNIFY_ALLOW_INTEGER
)
20934 && TREE_TYPE (targ
) && TREE_TYPE (arg
)
20935 && CP_INTEGRAL_TYPE_P (TREE_TYPE (targ
)))
20936 /* We're deducing from an array bound, the type doesn't matter. */
20937 arg
= fold_convert (TREE_TYPE (targ
), arg
);
20938 int x
= !cp_tree_equal (targ
, arg
);
20940 unify_inconsistency (explain_p
, parm
, targ
, arg
);
20944 /* [temp.deduct.type] If, in the declaration of a function template
20945 with a non-type template-parameter, the non-type
20946 template-parameter is used in an expression in the function
20947 parameter-list and, if the corresponding template-argument is
20948 deduced, the template-argument type shall match the type of the
20949 template-parameter exactly, except that a template-argument
20950 deduced from an array bound may be of any integral type.
20951 The non-type parameter might use already deduced type parameters. */
20952 tparm
= tsubst (TREE_TYPE (parm
), targs
, 0, NULL_TREE
);
20953 if (tree a
= type_uses_auto (tparm
))
20955 tparm
= do_auto_deduction (tparm
, arg
, a
, complain
, adc_unify
);
20956 if (tparm
== error_mark_node
)
20960 if (!TREE_TYPE (arg
))
20961 /* Template-parameter dependent expression. Just accept it for now.
20962 It will later be processed in convert_template_argument. */
20964 else if (same_type_p (non_reference (TREE_TYPE (arg
)),
20965 non_reference (tparm
)))
20967 else if ((strict
& UNIFY_ALLOW_INTEGER
)
20968 && CP_INTEGRAL_TYPE_P (tparm
))
20969 /* Convert the ARG to the type of PARM; the deduced non-type
20970 template argument must exactly match the types of the
20971 corresponding parameter. */
20972 arg
= fold (build_nop (tparm
, arg
));
20973 else if (uses_template_parms (tparm
))
20975 /* We haven't deduced the type of this parameter yet. */
20976 if (cxx_dialect
>= cxx17
20977 /* We deduce from array bounds in try_array_deduction. */
20978 && !(strict
& UNIFY_ALLOW_INTEGER
))
20980 /* Deduce it from the non-type argument. */
20981 tree atype
= TREE_TYPE (arg
);
20982 RECUR_AND_CHECK_FAILURE (tparms
, targs
,
20984 UNIFY_ALLOW_NONE
, explain_p
);
20987 /* Try again later. */
20988 return unify_success (explain_p
);
20991 return unify_type_mismatch (explain_p
, tparm
, TREE_TYPE (arg
));
20993 /* If ARG is a parameter pack or an expansion, we cannot unify
20994 against it unless PARM is also a parameter pack. */
20995 if ((template_parameter_pack_p (arg
) || PACK_EXPANSION_P (arg
))
20996 && !TEMPLATE_PARM_PARAMETER_PACK (parm
))
20997 return unify_parameter_pack_mismatch (explain_p
, parm
, arg
);
21000 bool removed_attr
= false;
21001 arg
= strip_typedefs_expr (arg
, &removed_attr
);
21003 TREE_VEC_ELT (INNERMOST_TEMPLATE_ARGS (targs
), idx
) = arg
;
21004 return unify_success (explain_p
);
21008 /* A pointer-to-member constant can be unified only with
21009 another constant. */
21010 if (TREE_CODE (arg
) != PTRMEM_CST
)
21011 return unify_ptrmem_cst_mismatch (explain_p
, parm
, arg
);
21013 /* Just unify the class member. It would be useless (and possibly
21014 wrong, depending on the strict flags) to unify also
21015 PTRMEM_CST_CLASS, because we want to be sure that both parm and
21016 arg refer to the same variable, even if through different
21017 classes. For instance:
21019 struct A { int x; };
21022 Unification of &A::x and &B::x must succeed. */
21023 return unify (tparms
, targs
, PTRMEM_CST_MEMBER (parm
),
21024 PTRMEM_CST_MEMBER (arg
), strict
, explain_p
);
21029 if (!TYPE_PTR_P (arg
))
21030 return unify_type_mismatch (explain_p
, parm
, arg
);
21032 /* [temp.deduct.call]
21034 A can be another pointer or pointer to member type that can
21035 be converted to the deduced A via a qualification
21036 conversion (_conv.qual_).
21038 We pass down STRICT here rather than UNIFY_ALLOW_NONE.
21039 This will allow for additional cv-qualification of the
21040 pointed-to types if appropriate. */
21042 if (TREE_CODE (TREE_TYPE (arg
)) == RECORD_TYPE
)
21043 /* The derived-to-base conversion only persists through one
21044 level of pointers. */
21045 strict
|= (strict_in
& UNIFY_ALLOW_DERIVED
);
21047 return unify (tparms
, targs
, TREE_TYPE (parm
),
21048 TREE_TYPE (arg
), strict
, explain_p
);
21051 case REFERENCE_TYPE
:
21052 if (TREE_CODE (arg
) != REFERENCE_TYPE
)
21053 return unify_type_mismatch (explain_p
, parm
, arg
);
21054 return unify (tparms
, targs
, TREE_TYPE (parm
), TREE_TYPE (arg
),
21055 strict
& UNIFY_ALLOW_MORE_CV_QUAL
, explain_p
);
21058 if (TREE_CODE (arg
) != ARRAY_TYPE
)
21059 return unify_type_mismatch (explain_p
, parm
, arg
);
21060 if ((TYPE_DOMAIN (parm
) == NULL_TREE
)
21061 != (TYPE_DOMAIN (arg
) == NULL_TREE
))
21062 return unify_type_mismatch (explain_p
, parm
, arg
);
21063 RECUR_AND_CHECK_FAILURE (tparms
, targs
, TREE_TYPE (parm
), TREE_TYPE (arg
),
21064 strict
& UNIFY_ALLOW_MORE_CV_QUAL
, explain_p
);
21065 if (TYPE_DOMAIN (parm
) != NULL_TREE
)
21066 return unify_array_domain (tparms
, targs
, TYPE_DOMAIN (parm
),
21067 TYPE_DOMAIN (arg
), explain_p
);
21068 return unify_success (explain_p
);
21075 case ENUMERAL_TYPE
:
21078 if (TREE_CODE (arg
) != TREE_CODE (parm
))
21079 return unify_type_mismatch (explain_p
, parm
, arg
);
21081 /* We have already checked cv-qualification at the top of the
21083 if (!same_type_ignoring_top_level_qualifiers_p (arg
, parm
))
21084 return unify_type_mismatch (explain_p
, parm
, arg
);
21086 /* As far as unification is concerned, this wins. Later checks
21087 will invalidate it if necessary. */
21088 return unify_success (explain_p
);
21090 /* Types INTEGER_CST and MINUS_EXPR can come from array bounds. */
21091 /* Type INTEGER_CST can come from ordinary constant template args. */
21093 while (CONVERT_EXPR_P (arg
))
21094 arg
= TREE_OPERAND (arg
, 0);
21096 if (TREE_CODE (arg
) != INTEGER_CST
)
21097 return unify_template_argument_mismatch (explain_p
, parm
, arg
);
21098 return (tree_int_cst_equal (parm
, arg
)
21099 ? unify_success (explain_p
)
21100 : unify_template_argument_mismatch (explain_p
, parm
, arg
));
21104 int i
, len
, argslen
;
21105 int parm_variadic_p
= 0;
21107 if (TREE_CODE (arg
) != TREE_VEC
)
21108 return unify_template_argument_mismatch (explain_p
, parm
, arg
);
21110 len
= TREE_VEC_LENGTH (parm
);
21111 argslen
= TREE_VEC_LENGTH (arg
);
21113 /* Check for pack expansions in the parameters. */
21114 for (i
= 0; i
< len
; ++i
)
21116 if (PACK_EXPANSION_P (TREE_VEC_ELT (parm
, i
)))
21119 /* We can unify against something with a trailing
21121 parm_variadic_p
= 1;
21123 /* [temp.deduct.type]/9: If the template argument list of
21124 P contains a pack expansion that is not the last
21125 template argument, the entire template argument list
21126 is a non-deduced context. */
21127 return unify_success (explain_p
);
21131 /* If we don't have enough arguments to satisfy the parameters
21132 (not counting the pack expression at the end), or we have
21133 too many arguments for a parameter list that doesn't end in
21134 a pack expression, we can't unify. */
21135 if (parm_variadic_p
21136 ? argslen
< len
- parm_variadic_p
21138 return unify_arity (explain_p
, TREE_VEC_LENGTH (arg
), len
);
21140 /* Unify all of the parameters that precede the (optional)
21141 pack expression. */
21142 for (i
= 0; i
< len
- parm_variadic_p
; ++i
)
21144 RECUR_AND_CHECK_FAILURE (tparms
, targs
,
21145 TREE_VEC_ELT (parm
, i
),
21146 TREE_VEC_ELT (arg
, i
),
21147 UNIFY_ALLOW_NONE
, explain_p
);
21149 if (parm_variadic_p
)
21150 return unify_pack_expansion (tparms
, targs
, parm
, arg
,
21152 /*subr=*/true, explain_p
);
21153 return unify_success (explain_p
);
21158 if (TREE_CODE (arg
) != TREE_CODE (parm
))
21159 return unify_type_mismatch (explain_p
, parm
, arg
);
21161 if (TYPE_PTRMEMFUNC_P (parm
))
21163 if (!TYPE_PTRMEMFUNC_P (arg
))
21164 return unify_type_mismatch (explain_p
, parm
, arg
);
21166 return unify (tparms
, targs
,
21167 TYPE_PTRMEMFUNC_FN_TYPE (parm
),
21168 TYPE_PTRMEMFUNC_FN_TYPE (arg
),
21169 strict
, explain_p
);
21171 else if (TYPE_PTRMEMFUNC_P (arg
))
21172 return unify_type_mismatch (explain_p
, parm
, arg
);
21174 if (CLASSTYPE_TEMPLATE_INFO (parm
))
21176 tree t
= NULL_TREE
;
21178 if (strict_in
& UNIFY_ALLOW_DERIVED
)
21180 /* First, we try to unify the PARM and ARG directly. */
21181 t
= try_class_unification (tparms
, targs
,
21182 parm
, arg
, explain_p
);
21186 /* Fallback to the special case allowed in
21187 [temp.deduct.call]:
21189 If P is a class, and P has the form
21190 template-id, then A can be a derived class of
21191 the deduced A. Likewise, if P is a pointer to
21192 a class of the form template-id, A can be a
21193 pointer to a derived class pointed to by the
21195 enum template_base_result r
;
21196 r
= get_template_base (tparms
, targs
, parm
, arg
,
21201 /* Don't give the derived diagnostic if we're
21202 already dealing with the same template. */
21204 = (CLASSTYPE_TEMPLATE_INFO (arg
)
21205 && (CLASSTYPE_TI_TEMPLATE (parm
)
21206 == CLASSTYPE_TI_TEMPLATE (arg
)));
21207 return unify_no_common_base (explain_p
&& !same_template
,
21212 else if (CLASSTYPE_TEMPLATE_INFO (arg
)
21213 && (CLASSTYPE_TI_TEMPLATE (parm
)
21214 == CLASSTYPE_TI_TEMPLATE (arg
)))
21215 /* Perhaps PARM is something like S<U> and ARG is S<int>.
21216 Then, we should unify `int' and `U'. */
21219 /* There's no chance of unification succeeding. */
21220 return unify_type_mismatch (explain_p
, parm
, arg
);
21222 return unify (tparms
, targs
, CLASSTYPE_TI_ARGS (parm
),
21223 CLASSTYPE_TI_ARGS (t
), UNIFY_ALLOW_NONE
, explain_p
);
21225 else if (!same_type_ignoring_top_level_qualifiers_p (parm
, arg
))
21226 return unify_type_mismatch (explain_p
, parm
, arg
);
21227 return unify_success (explain_p
);
21230 case FUNCTION_TYPE
:
21232 unsigned int nargs
;
21237 if (TREE_CODE (arg
) != TREE_CODE (parm
))
21238 return unify_type_mismatch (explain_p
, parm
, arg
);
21240 /* CV qualifications for methods can never be deduced, they must
21241 match exactly. We need to check them explicitly here,
21242 because type_unification_real treats them as any other
21243 cv-qualified parameter. */
21244 if (TREE_CODE (parm
) == METHOD_TYPE
21245 && (!check_cv_quals_for_unify
21247 class_of_this_parm (arg
),
21248 class_of_this_parm (parm
))))
21249 return unify_cv_qual_mismatch (explain_p
, parm
, arg
);
21250 if (TREE_CODE (arg
) == FUNCTION_TYPE
21251 && type_memfn_quals (parm
) != type_memfn_quals (arg
))
21252 return unify_cv_qual_mismatch (explain_p
, parm
, arg
);
21253 if (type_memfn_rqual (parm
) != type_memfn_rqual (arg
))
21254 return unify_type_mismatch (explain_p
, parm
, arg
);
21256 RECUR_AND_CHECK_FAILURE (tparms
, targs
, TREE_TYPE (parm
),
21257 TREE_TYPE (arg
), UNIFY_ALLOW_NONE
, explain_p
);
21259 nargs
= list_length (TYPE_ARG_TYPES (arg
));
21260 args
= XALLOCAVEC (tree
, nargs
);
21261 for (a
= TYPE_ARG_TYPES (arg
), i
= 0;
21262 a
!= NULL_TREE
&& a
!= void_list_node
;
21263 a
= TREE_CHAIN (a
), ++i
)
21264 args
[i
] = TREE_VALUE (a
);
21267 if (type_unification_real (tparms
, targs
, TYPE_ARG_TYPES (parm
),
21268 args
, nargs
, 1, DEDUCE_EXACT
,
21269 LOOKUP_NORMAL
, NULL
, explain_p
))
21272 if (flag_noexcept_type
)
21274 tree pspec
= TYPE_RAISES_EXCEPTIONS (parm
);
21275 tree aspec
= canonical_eh_spec (TYPE_RAISES_EXCEPTIONS (arg
));
21276 if (pspec
== NULL_TREE
) pspec
= noexcept_false_spec
;
21277 if (aspec
== NULL_TREE
) aspec
= noexcept_false_spec
;
21278 if (TREE_PURPOSE (pspec
) && TREE_PURPOSE (aspec
)
21279 && uses_template_parms (TREE_PURPOSE (pspec
)))
21280 RECUR_AND_CHECK_FAILURE (tparms
, targs
, TREE_PURPOSE (pspec
),
21281 TREE_PURPOSE (aspec
),
21282 UNIFY_ALLOW_NONE
, explain_p
);
21283 else if (nothrow_spec_p (pspec
) && !nothrow_spec_p (aspec
))
21284 return unify_type_mismatch (explain_p
, parm
, arg
);
21291 /* Unify a pointer to member with a pointer to member function, which
21292 deduces the type of the member as a function type. */
21293 if (TYPE_PTRMEMFUNC_P (arg
))
21295 /* Check top-level cv qualifiers */
21296 if (!check_cv_quals_for_unify (UNIFY_ALLOW_NONE
, arg
, parm
))
21297 return unify_cv_qual_mismatch (explain_p
, parm
, arg
);
21299 RECUR_AND_CHECK_FAILURE (tparms
, targs
, TYPE_OFFSET_BASETYPE (parm
),
21300 TYPE_PTRMEMFUNC_OBJECT_TYPE (arg
),
21301 UNIFY_ALLOW_NONE
, explain_p
);
21303 /* Determine the type of the function we are unifying against. */
21304 tree fntype
= static_fn_type (arg
);
21306 return unify (tparms
, targs
, TREE_TYPE (parm
), fntype
, strict
, explain_p
);
21309 if (TREE_CODE (arg
) != OFFSET_TYPE
)
21310 return unify_type_mismatch (explain_p
, parm
, arg
);
21311 RECUR_AND_CHECK_FAILURE (tparms
, targs
, TYPE_OFFSET_BASETYPE (parm
),
21312 TYPE_OFFSET_BASETYPE (arg
),
21313 UNIFY_ALLOW_NONE
, explain_p
);
21314 return unify (tparms
, targs
, TREE_TYPE (parm
), TREE_TYPE (arg
),
21315 strict
, explain_p
);
21318 if (DECL_TEMPLATE_PARM_P (parm
))
21319 return unify (tparms
, targs
, DECL_INITIAL (parm
), arg
, strict
, explain_p
);
21320 if (arg
!= scalar_constant_value (parm
))
21321 return unify_template_argument_mismatch (explain_p
, parm
, arg
);
21322 return unify_success (explain_p
);
21325 case TEMPLATE_DECL
:
21326 /* Matched cases are handled by the ARG == PARM test above. */
21327 return unify_template_argument_mismatch (explain_p
, parm
, arg
);
21330 /* We might get a variable as a non-type template argument in parm if the
21331 corresponding parameter is type-dependent. Make any necessary
21332 adjustments based on whether arg is a reference. */
21333 if (CONSTANT_CLASS_P (arg
))
21334 parm
= fold_non_dependent_expr (parm
);
21335 else if (REFERENCE_REF_P (arg
))
21337 tree sub
= TREE_OPERAND (arg
, 0);
21339 if (TREE_CODE (sub
) == ADDR_EXPR
)
21340 arg
= TREE_OPERAND (sub
, 0);
21342 /* Now use the normal expression code to check whether they match. */
21345 case TYPE_ARGUMENT_PACK
:
21346 case NONTYPE_ARGUMENT_PACK
:
21347 return unify (tparms
, targs
, ARGUMENT_PACK_ARGS (parm
),
21348 ARGUMENT_PACK_ARGS (arg
), strict
, explain_p
);
21351 case DECLTYPE_TYPE
:
21352 case UNDERLYING_TYPE
:
21353 /* Cannot deduce anything from TYPEOF_TYPE, DECLTYPE_TYPE,
21354 or UNDERLYING_TYPE nodes. */
21355 return unify_success (explain_p
);
21358 /* Unification fails if we hit an error node. */
21359 return unify_invalid (explain_p
);
21362 if (REFERENCE_REF_P (parm
))
21364 bool pexp
= PACK_EXPANSION_P (arg
);
21366 arg
= PACK_EXPANSION_PATTERN (arg
);
21367 if (REFERENCE_REF_P (arg
))
21368 arg
= TREE_OPERAND (arg
, 0);
21370 arg
= make_pack_expansion (arg
, complain
);
21371 return unify (tparms
, targs
, TREE_OPERAND (parm
, 0), arg
,
21372 strict
, explain_p
);
21377 /* An unresolved overload is a nondeduced context. */
21378 if (is_overloaded_fn (parm
) || type_unknown_p (parm
))
21379 return unify_success (explain_p
);
21380 gcc_assert (EXPR_P (parm
) || TREE_CODE (parm
) == TRAIT_EXPR
);
21382 /* We must be looking at an expression. This can happen with
21386 void foo(S<I>, S<I + 2>);
21388 This is a "nondeduced context":
21392 The nondeduced contexts are:
21394 --A type that is a template-id in which one or more of
21395 the template-arguments is an expression that references
21396 a template-parameter.
21398 In these cases, we assume deduction succeeded, but don't
21399 actually infer any unifications. */
21401 if (!uses_template_parms (parm
)
21402 && !template_args_equal (parm
, arg
))
21403 return unify_expression_unequal (explain_p
, parm
, arg
);
21405 return unify_success (explain_p
);
21408 #undef RECUR_AND_CHECK_FAILURE
21410 /* Note that DECL can be defined in this translation unit, if
21414 mark_definable (tree decl
)
21417 DECL_NOT_REALLY_EXTERN (decl
) = 1;
21418 FOR_EACH_CLONE (clone
, decl
)
21419 DECL_NOT_REALLY_EXTERN (clone
) = 1;
21422 /* Called if RESULT is explicitly instantiated, or is a member of an
21423 explicitly instantiated class. */
21426 mark_decl_instantiated (tree result
, int extern_p
)
21428 SET_DECL_EXPLICIT_INSTANTIATION (result
);
21430 /* If this entity has already been written out, it's too late to
21431 make any modifications. */
21432 if (TREE_ASM_WRITTEN (result
))
21435 /* For anonymous namespace we don't need to do anything. */
21436 if (decl_anon_ns_mem_p (result
))
21438 gcc_assert (!TREE_PUBLIC (result
));
21442 if (TREE_CODE (result
) != FUNCTION_DECL
)
21443 /* The TREE_PUBLIC flag for function declarations will have been
21444 set correctly by tsubst. */
21445 TREE_PUBLIC (result
) = 1;
21447 /* This might have been set by an earlier implicit instantiation. */
21448 DECL_COMDAT (result
) = 0;
21451 DECL_NOT_REALLY_EXTERN (result
) = 0;
21454 mark_definable (result
);
21455 mark_needed (result
);
21456 /* Always make artificials weak. */
21457 if (DECL_ARTIFICIAL (result
) && flag_weak
)
21458 comdat_linkage (result
);
21459 /* For WIN32 we also want to put explicit instantiations in
21460 linkonce sections. */
21461 else if (TREE_PUBLIC (result
))
21462 maybe_make_one_only (result
);
21465 /* If EXTERN_P, then this function will not be emitted -- unless
21466 followed by an explicit instantiation, at which point its linkage
21467 will be adjusted. If !EXTERN_P, then this function will be
21468 emitted here. In neither circumstance do we want
21469 import_export_decl to adjust the linkage. */
21470 DECL_INTERFACE_KNOWN (result
) = 1;
21473 /* Subroutine of more_specialized_fn: check whether TARGS is missing any
21474 important template arguments. If any are missing, we check whether
21475 they're important by using error_mark_node for substituting into any
21476 args that were used for partial ordering (the ones between ARGS and END)
21477 and seeing if it bubbles up. */
21480 check_undeduced_parms (tree targs
, tree args
, tree end
)
21482 bool found
= false;
21484 for (i
= TREE_VEC_LENGTH (targs
) - 1; i
>= 0; --i
)
21485 if (TREE_VEC_ELT (targs
, i
) == NULL_TREE
)
21488 TREE_VEC_ELT (targs
, i
) = error_mark_node
;
21492 tree substed
= tsubst_arg_types (args
, targs
, end
, tf_none
, NULL_TREE
);
21493 if (substed
== error_mark_node
)
21499 /* Given two function templates PAT1 and PAT2, return:
21501 1 if PAT1 is more specialized than PAT2 as described in [temp.func.order].
21502 -1 if PAT2 is more specialized than PAT1.
21503 0 if neither is more specialized.
21505 LEN indicates the number of parameters we should consider
21506 (defaulted parameters should not be considered).
21508 The 1998 std underspecified function template partial ordering, and
21509 DR214 addresses the issue. We take pairs of arguments, one from
21510 each of the templates, and deduce them against each other. One of
21511 the templates will be more specialized if all the *other*
21512 template's arguments deduce against its arguments and at least one
21513 of its arguments *does* *not* deduce against the other template's
21514 corresponding argument. Deduction is done as for class templates.
21515 The arguments used in deduction have reference and top level cv
21516 qualifiers removed. Iff both arguments were originally reference
21517 types *and* deduction succeeds in both directions, an lvalue reference
21518 wins against an rvalue reference and otherwise the template
21519 with the more cv-qualified argument wins for that pairing (if
21520 neither is more cv-qualified, they both are equal). Unlike regular
21521 deduction, after all the arguments have been deduced in this way,
21522 we do *not* verify the deduced template argument values can be
21523 substituted into non-deduced contexts.
21525 The logic can be a bit confusing here, because we look at deduce1 and
21526 targs1 to see if pat2 is at least as specialized, and vice versa; if we
21527 can find template arguments for pat1 to make arg1 look like arg2, that
21528 means that arg2 is at least as specialized as arg1. */
21531 more_specialized_fn (tree pat1
, tree pat2
, int len
)
21533 tree decl1
= DECL_TEMPLATE_RESULT (pat1
);
21534 tree decl2
= DECL_TEMPLATE_RESULT (pat2
);
21535 tree targs1
= make_tree_vec (DECL_NTPARMS (pat1
));
21536 tree targs2
= make_tree_vec (DECL_NTPARMS (pat2
));
21537 tree tparms1
= DECL_INNERMOST_TEMPLATE_PARMS (pat1
);
21538 tree tparms2
= DECL_INNERMOST_TEMPLATE_PARMS (pat2
);
21539 tree args1
= TYPE_ARG_TYPES (TREE_TYPE (decl1
));
21540 tree args2
= TYPE_ARG_TYPES (TREE_TYPE (decl2
));
21541 tree origs1
, origs2
;
21542 bool lose1
= false;
21543 bool lose2
= false;
21545 /* Remove the this parameter from non-static member functions. If
21546 one is a non-static member function and the other is not a static
21547 member function, remove the first parameter from that function
21548 also. This situation occurs for operator functions where we
21549 locate both a member function (with this pointer) and non-member
21550 operator (with explicit first operand). */
21551 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (decl1
))
21553 len
--; /* LEN is the number of significant arguments for DECL1 */
21554 args1
= TREE_CHAIN (args1
);
21555 if (!DECL_STATIC_FUNCTION_P (decl2
))
21556 args2
= TREE_CHAIN (args2
);
21558 else if (DECL_NONSTATIC_MEMBER_FUNCTION_P (decl2
))
21560 args2
= TREE_CHAIN (args2
);
21561 if (!DECL_STATIC_FUNCTION_P (decl1
))
21564 args1
= TREE_CHAIN (args1
);
21568 /* If only one is a conversion operator, they are unordered. */
21569 if (DECL_CONV_FN_P (decl1
) != DECL_CONV_FN_P (decl2
))
21572 /* Consider the return type for a conversion function */
21573 if (DECL_CONV_FN_P (decl1
))
21575 args1
= tree_cons (NULL_TREE
, TREE_TYPE (TREE_TYPE (decl1
)), args1
);
21576 args2
= tree_cons (NULL_TREE
, TREE_TYPE (TREE_TYPE (decl2
)), args2
);
21580 processing_template_decl
++;
21586 /* Stop when an ellipsis is seen. */
21587 && args1
!= NULL_TREE
&& args2
!= NULL_TREE
)
21589 tree arg1
= TREE_VALUE (args1
);
21590 tree arg2
= TREE_VALUE (args2
);
21591 int deduce1
, deduce2
;
21597 if (TREE_CODE (arg1
) == TYPE_PACK_EXPANSION
21598 && TREE_CODE (arg2
) == TYPE_PACK_EXPANSION
)
21600 /* When both arguments are pack expansions, we need only
21601 unify the patterns themselves. */
21602 arg1
= PACK_EXPANSION_PATTERN (arg1
);
21603 arg2
= PACK_EXPANSION_PATTERN (arg2
);
21605 /* This is the last comparison we need to do. */
21609 /* DR 1847: If a particular P contains no template-parameters that
21610 participate in template argument deduction, that P is not used to
21611 determine the ordering. */
21612 if (!uses_deducible_template_parms (arg1
)
21613 && !uses_deducible_template_parms (arg2
))
21616 if (TREE_CODE (arg1
) == REFERENCE_TYPE
)
21618 ref1
= TYPE_REF_IS_RVALUE (arg1
) + 1;
21619 arg1
= TREE_TYPE (arg1
);
21620 quals1
= cp_type_quals (arg1
);
21623 if (TREE_CODE (arg2
) == REFERENCE_TYPE
)
21625 ref2
= TYPE_REF_IS_RVALUE (arg2
) + 1;
21626 arg2
= TREE_TYPE (arg2
);
21627 quals2
= cp_type_quals (arg2
);
21630 arg1
= TYPE_MAIN_VARIANT (arg1
);
21631 arg2
= TYPE_MAIN_VARIANT (arg2
);
21633 if (TREE_CODE (arg1
) == TYPE_PACK_EXPANSION
)
21635 int i
, len2
= remaining_arguments (args2
);
21636 tree parmvec
= make_tree_vec (1);
21637 tree argvec
= make_tree_vec (len2
);
21640 /* Setup the parameter vector, which contains only ARG1. */
21641 TREE_VEC_ELT (parmvec
, 0) = arg1
;
21643 /* Setup the argument vector, which contains the remaining
21645 for (i
= 0; i
< len2
; i
++, ta
= TREE_CHAIN (ta
))
21646 TREE_VEC_ELT (argvec
, i
) = TREE_VALUE (ta
);
21648 deduce1
= (unify_pack_expansion (tparms1
, targs1
, parmvec
,
21649 argvec
, DEDUCE_EXACT
,
21650 /*subr=*/true, /*explain_p=*/false)
21653 /* We cannot deduce in the other direction, because ARG1 is
21654 a pack expansion but ARG2 is not. */
21657 else if (TREE_CODE (arg2
) == TYPE_PACK_EXPANSION
)
21659 int i
, len1
= remaining_arguments (args1
);
21660 tree parmvec
= make_tree_vec (1);
21661 tree argvec
= make_tree_vec (len1
);
21664 /* Setup the parameter vector, which contains only ARG1. */
21665 TREE_VEC_ELT (parmvec
, 0) = arg2
;
21667 /* Setup the argument vector, which contains the remaining
21669 for (i
= 0; i
< len1
; i
++, ta
= TREE_CHAIN (ta
))
21670 TREE_VEC_ELT (argvec
, i
) = TREE_VALUE (ta
);
21672 deduce2
= (unify_pack_expansion (tparms2
, targs2
, parmvec
,
21673 argvec
, DEDUCE_EXACT
,
21674 /*subr=*/true, /*explain_p=*/false)
21677 /* We cannot deduce in the other direction, because ARG2 is
21678 a pack expansion but ARG1 is not.*/
21684 /* The normal case, where neither argument is a pack
21686 deduce1
= (unify (tparms1
, targs1
, arg1
, arg2
,
21687 UNIFY_ALLOW_NONE
, /*explain_p=*/false)
21689 deduce2
= (unify (tparms2
, targs2
, arg2
, arg1
,
21690 UNIFY_ALLOW_NONE
, /*explain_p=*/false)
21694 /* If we couldn't deduce arguments for tparms1 to make arg1 match
21695 arg2, then arg2 is not as specialized as arg1. */
21701 /* "If, for a given type, deduction succeeds in both directions
21702 (i.e., the types are identical after the transformations above)
21703 and both P and A were reference types (before being replaced with
21704 the type referred to above):
21705 - if the type from the argument template was an lvalue reference and
21706 the type from the parameter template was not, the argument type is
21707 considered to be more specialized than the other; otherwise,
21708 - if the type from the argument template is more cv-qualified
21709 than the type from the parameter template (as described above),
21710 the argument type is considered to be more specialized than the other;
21712 - neither type is more specialized than the other." */
21714 if (deduce1
&& deduce2
)
21716 if (ref1
&& ref2
&& ref1
!= ref2
)
21723 else if (quals1
!= quals2
&& quals1
>= 0 && quals2
>= 0)
21725 if ((quals1
& quals2
) == quals2
)
21727 if ((quals1
& quals2
) == quals1
)
21732 if (lose1
&& lose2
)
21733 /* We've failed to deduce something in either direction.
21734 These must be unordered. */
21739 if (TREE_CODE (arg1
) == TYPE_PACK_EXPANSION
21740 || TREE_CODE (arg2
) == TYPE_PACK_EXPANSION
)
21741 /* We have already processed all of the arguments in our
21742 handing of the pack expansion type. */
21745 args1
= TREE_CHAIN (args1
);
21746 args2
= TREE_CHAIN (args2
);
21749 /* "In most cases, all template parameters must have values in order for
21750 deduction to succeed, but for partial ordering purposes a template
21751 parameter may remain without a value provided it is not used in the
21752 types being used for partial ordering."
21754 Thus, if we are missing any of the targs1 we need to substitute into
21755 origs1, then pat2 is not as specialized as pat1. This can happen when
21756 there is a nondeduced context. */
21757 if (!lose2
&& check_undeduced_parms (targs1
, origs1
, args1
))
21759 if (!lose1
&& check_undeduced_parms (targs2
, origs2
, args2
))
21762 processing_template_decl
--;
21764 /* If both deductions succeed, the partial ordering selects the more
21765 constrained template. */
21766 if (!lose1
&& !lose2
)
21768 tree c1
= get_constraints (DECL_TEMPLATE_RESULT (pat1
));
21769 tree c2
= get_constraints (DECL_TEMPLATE_RESULT (pat2
));
21770 lose1
= !subsumes_constraints (c1
, c2
);
21771 lose2
= !subsumes_constraints (c2
, c1
);
21774 /* All things being equal, if the next argument is a pack expansion
21775 for one function but not for the other, prefer the
21776 non-variadic function. FIXME this is bogus; see c++/41958. */
21778 && args1
&& TREE_VALUE (args1
)
21779 && args2
&& TREE_VALUE (args2
))
21781 lose1
= TREE_CODE (TREE_VALUE (args1
)) == TYPE_PACK_EXPANSION
;
21782 lose2
= TREE_CODE (TREE_VALUE (args2
)) == TYPE_PACK_EXPANSION
;
21785 if (lose1
== lose2
)
21793 /* Determine which of two partial specializations of TMPL is more
21796 PAT1 is a TREE_LIST whose TREE_VALUE is the TEMPLATE_DECL corresponding
21797 to the first partial specialization. The TREE_PURPOSE is the
21798 innermost set of template parameters for the partial
21799 specialization. PAT2 is similar, but for the second template.
21801 Return 1 if the first partial specialization is more specialized;
21802 -1 if the second is more specialized; 0 if neither is more
21805 See [temp.class.order] for information about determining which of
21806 two templates is more specialized. */
21809 more_specialized_partial_spec (tree tmpl
, tree pat1
, tree pat2
)
21813 bool any_deductions
= false;
21815 tree tmpl1
= TREE_VALUE (pat1
);
21816 tree tmpl2
= TREE_VALUE (pat2
);
21817 tree specargs1
= TI_ARGS (get_template_info (DECL_TEMPLATE_RESULT (tmpl1
)));
21818 tree specargs2
= TI_ARGS (get_template_info (DECL_TEMPLATE_RESULT (tmpl2
)));
21820 /* Just like what happens for functions, if we are ordering between
21821 different template specializations, we may encounter dependent
21822 types in the arguments, and we need our dependency check functions
21823 to behave correctly. */
21824 ++processing_template_decl
;
21825 targs
= get_partial_spec_bindings (tmpl
, tmpl1
, specargs2
);
21829 any_deductions
= true;
21832 targs
= get_partial_spec_bindings (tmpl
, tmpl2
, specargs1
);
21836 any_deductions
= true;
21838 --processing_template_decl
;
21840 /* If both deductions succeed, the partial ordering selects the more
21841 constrained template. */
21842 if (!winner
&& any_deductions
)
21843 return more_constrained (tmpl1
, tmpl2
);
21845 /* In the case of a tie where at least one of the templates
21846 has a parameter pack at the end, the template with the most
21847 non-packed parameters wins. */
21850 && (template_args_variadic_p (TREE_PURPOSE (pat1
))
21851 || template_args_variadic_p (TREE_PURPOSE (pat2
))))
21853 tree args1
= INNERMOST_TEMPLATE_ARGS (TREE_PURPOSE (pat1
));
21854 tree args2
= INNERMOST_TEMPLATE_ARGS (TREE_PURPOSE (pat2
));
21855 int len1
= TREE_VEC_LENGTH (args1
);
21856 int len2
= TREE_VEC_LENGTH (args2
);
21858 /* We don't count the pack expansion at the end. */
21859 if (template_args_variadic_p (TREE_PURPOSE (pat1
)))
21861 if (template_args_variadic_p (TREE_PURPOSE (pat2
)))
21866 else if (len1
< len2
)
21873 /* Return the template arguments that will produce the function signature
21874 DECL from the function template FN, with the explicit template
21875 arguments EXPLICIT_ARGS. If CHECK_RETTYPE is true, the return type must
21876 also match. Return NULL_TREE if no satisfactory arguments could be
21880 get_bindings (tree fn
, tree decl
, tree explicit_args
, bool check_rettype
)
21882 int ntparms
= DECL_NTPARMS (fn
);
21883 tree targs
= make_tree_vec (ntparms
);
21884 tree decl_type
= TREE_TYPE (decl
);
21885 tree decl_arg_types
;
21887 unsigned int nargs
, ix
;
21890 gcc_assert (decl
!= DECL_TEMPLATE_RESULT (fn
));
21892 /* Never do unification on the 'this' parameter. */
21893 decl_arg_types
= skip_artificial_parms_for (decl
,
21894 TYPE_ARG_TYPES (decl_type
));
21896 nargs
= list_length (decl_arg_types
);
21897 args
= XALLOCAVEC (tree
, nargs
);
21898 for (arg
= decl_arg_types
, ix
= 0;
21899 arg
!= NULL_TREE
&& arg
!= void_list_node
;
21900 arg
= TREE_CHAIN (arg
), ++ix
)
21901 args
[ix
] = TREE_VALUE (arg
);
21903 if (fn_type_unification (fn
, explicit_args
, targs
,
21905 (check_rettype
|| DECL_CONV_FN_P (fn
)
21906 ? TREE_TYPE (decl_type
) : NULL_TREE
),
21907 DEDUCE_EXACT
, LOOKUP_NORMAL
, /*explain_p=*/false,
21909 == error_mark_node
)
21915 /* Return the innermost template arguments that, when applied to a partial
21916 specialization SPEC_TMPL of TMPL, yield the ARGS.
21918 For example, suppose we have:
21920 template <class T, class U> struct S {};
21921 template <class T> struct S<T*, int> {};
21923 Then, suppose we want to get `S<double*, int>'. SPEC_TMPL will be the
21924 partial specialization and the ARGS will be {double*, int}. The resulting
21925 vector will be {double}, indicating that `T' is bound to `double'. */
21928 get_partial_spec_bindings (tree tmpl
, tree spec_tmpl
, tree args
)
21930 tree tparms
= DECL_INNERMOST_TEMPLATE_PARMS (spec_tmpl
);
21932 = TI_ARGS (get_template_info (DECL_TEMPLATE_RESULT (spec_tmpl
)));
21933 int i
, ntparms
= TREE_VEC_LENGTH (tparms
);
21935 tree innermost_deduced_args
;
21937 innermost_deduced_args
= make_tree_vec (ntparms
);
21938 if (TMPL_ARGS_HAVE_MULTIPLE_LEVELS (args
))
21940 deduced_args
= copy_node (args
);
21941 SET_TMPL_ARGS_LEVEL (deduced_args
,
21942 TMPL_ARGS_DEPTH (deduced_args
),
21943 innermost_deduced_args
);
21946 deduced_args
= innermost_deduced_args
;
21948 bool tried_array_deduction
= (cxx_dialect
< cxx17
);
21950 if (unify (tparms
, deduced_args
,
21951 INNERMOST_TEMPLATE_ARGS (spec_args
),
21952 INNERMOST_TEMPLATE_ARGS (args
),
21953 UNIFY_ALLOW_NONE
, /*explain_p=*/false))
21956 for (i
= 0; i
< ntparms
; ++i
)
21957 if (! TREE_VEC_ELT (innermost_deduced_args
, i
))
21959 if (!tried_array_deduction
)
21961 try_array_deduction (tparms
, innermost_deduced_args
,
21962 INNERMOST_TEMPLATE_ARGS (spec_args
));
21963 tried_array_deduction
= true;
21964 if (TREE_VEC_ELT (innermost_deduced_args
, i
))
21970 tree tinst
= build_tree_list (spec_tmpl
, deduced_args
);
21971 if (!push_tinst_level (tinst
))
21973 excessive_deduction_depth
= true;
21977 /* Verify that nondeduced template arguments agree with the type
21978 obtained from argument deduction.
21982 struct A { typedef int X; };
21983 template <class T, class U> struct C {};
21984 template <class T> struct C<T, typename T::X> {};
21986 Then with the instantiation `C<A, int>', we can deduce that
21987 `T' is `A' but unify () does not check whether `typename T::X'
21989 spec_args
= tsubst (spec_args
, deduced_args
, tf_none
, NULL_TREE
);
21991 if (spec_args
!= error_mark_node
)
21992 spec_args
= coerce_template_parms (DECL_INNERMOST_TEMPLATE_PARMS (tmpl
),
21993 INNERMOST_TEMPLATE_ARGS (spec_args
),
21994 tmpl
, tf_none
, false, false);
21996 pop_tinst_level ();
21998 if (spec_args
== error_mark_node
21999 /* We only need to check the innermost arguments; the other
22000 arguments will always agree. */
22001 || !comp_template_args_porder (INNERMOST_TEMPLATE_ARGS (spec_args
),
22002 INNERMOST_TEMPLATE_ARGS (args
)))
22005 /* Now that we have bindings for all of the template arguments,
22006 ensure that the arguments deduced for the template template
22007 parameters have compatible template parameter lists. See the use
22008 of template_template_parm_bindings_ok_p in fn_type_unification
22009 for more information. */
22010 if (!template_template_parm_bindings_ok_p (tparms
, deduced_args
))
22013 return deduced_args
;
22016 // Compare two function templates T1 and T2 by deducing bindings
22017 // from one against the other. If both deductions succeed, compare
22018 // constraints to see which is more constrained.
22020 more_specialized_inst (tree t1
, tree t2
)
22025 if (get_bindings (t1
, DECL_TEMPLATE_RESULT (t2
), NULL_TREE
, true))
22031 if (get_bindings (t2
, DECL_TEMPLATE_RESULT (t1
), NULL_TREE
, true))
22037 // If both deductions succeed, then one may be more constrained.
22038 if (count
== 2 && fate
== 0)
22039 fate
= more_constrained (t1
, t2
);
22044 /* TEMPLATES is a TREE_LIST. Each TREE_VALUE is a TEMPLATE_DECL.
22045 Return the TREE_LIST node with the most specialized template, if
22046 any. If there is no most specialized template, the error_mark_node
22049 Note that this function does not look at, or modify, the
22050 TREE_PURPOSE or TREE_TYPE of any of the nodes. Since the node
22051 returned is one of the elements of INSTANTIATIONS, callers may
22052 store information in the TREE_PURPOSE or TREE_TYPE of the nodes,
22053 and retrieve it from the value returned. */
22056 most_specialized_instantiation (tree templates
)
22060 ++processing_template_decl
;
22063 for (fn
= TREE_CHAIN (templates
); fn
; fn
= TREE_CHAIN (fn
))
22065 gcc_assert (TREE_VALUE (champ
) != TREE_VALUE (fn
));
22066 int fate
= more_specialized_inst (TREE_VALUE (champ
), TREE_VALUE (fn
));
22071 /* Equally specialized, move to next function. If there
22072 is no next function, nothing's most specialized. */
22073 fn
= TREE_CHAIN (fn
);
22081 /* Now verify that champ is better than everything earlier in the
22082 instantiation list. */
22083 for (fn
= templates
; fn
!= champ
; fn
= TREE_CHAIN (fn
)) {
22084 if (more_specialized_inst (TREE_VALUE (champ
), TREE_VALUE (fn
)) != 1)
22091 processing_template_decl
--;
22094 return error_mark_node
;
22099 /* If DECL is a specialization of some template, return the most
22100 general such template. Otherwise, returns NULL_TREE.
22102 For example, given:
22104 template <class T> struct S { template <class U> void f(U); };
22106 if TMPL is `template <class U> void S<int>::f(U)' this will return
22107 the full template. This function will not trace past partial
22108 specializations, however. For example, given in addition:
22110 template <class T> struct S<T*> { template <class U> void f(U); };
22112 if TMPL is `template <class U> void S<int*>::f(U)' this will return
22113 `template <class T> template <class U> S<T*>::f(U)'. */
22116 most_general_template (tree decl
)
22118 if (TREE_CODE (decl
) != TEMPLATE_DECL
)
22120 if (tree tinfo
= get_template_info (decl
))
22121 decl
= TI_TEMPLATE (tinfo
);
22122 /* The TI_TEMPLATE can be an IDENTIFIER_NODE for a
22123 template friend, or a FIELD_DECL for a capture pack. */
22124 if (TREE_CODE (decl
) != TEMPLATE_DECL
)
22128 /* Look for more and more general templates. */
22129 while (DECL_LANG_SPECIFIC (decl
) && DECL_TEMPLATE_INFO (decl
))
22131 /* The DECL_TI_TEMPLATE can be an IDENTIFIER_NODE in some cases.
22132 (See cp-tree.h for details.) */
22133 if (TREE_CODE (DECL_TI_TEMPLATE (decl
)) != TEMPLATE_DECL
)
22136 if (CLASS_TYPE_P (TREE_TYPE (decl
))
22137 && !TYPE_DECL_ALIAS_P (TYPE_NAME (TREE_TYPE (decl
)))
22138 && CLASSTYPE_TEMPLATE_SPECIALIZATION (TREE_TYPE (decl
)))
22141 /* Stop if we run into an explicitly specialized class template. */
22142 if (!DECL_NAMESPACE_SCOPE_P (decl
)
22143 && DECL_CONTEXT (decl
)
22144 && CLASSTYPE_TEMPLATE_SPECIALIZATION (DECL_CONTEXT (decl
)))
22147 decl
= DECL_TI_TEMPLATE (decl
);
22153 /* Return the most specialized of the template partial specializations
22154 which can produce TARGET, a specialization of some class or variable
22155 template. The value returned is actually a TREE_LIST; the TREE_VALUE is
22156 a TEMPLATE_DECL node corresponding to the partial specialization, while
22157 the TREE_PURPOSE is the set of template arguments that must be
22158 substituted into the template pattern in order to generate TARGET.
22160 If the choice of partial specialization is ambiguous, a diagnostic
22161 is issued, and the error_mark_node is returned. If there are no
22162 partial specializations matching TARGET, then NULL_TREE is
22163 returned, indicating that the primary template should be used. */
22166 most_specialized_partial_spec (tree target
, tsubst_flags_t complain
)
22168 tree list
= NULL_TREE
;
22173 tree outer_args
= NULL_TREE
;
22176 if (TYPE_P (target
))
22178 tree tinfo
= CLASSTYPE_TEMPLATE_INFO (target
);
22179 tmpl
= TI_TEMPLATE (tinfo
);
22180 args
= TI_ARGS (tinfo
);
22182 else if (TREE_CODE (target
) == TEMPLATE_ID_EXPR
)
22184 tmpl
= TREE_OPERAND (target
, 0);
22185 args
= TREE_OPERAND (target
, 1);
22187 else if (VAR_P (target
))
22189 tree tinfo
= DECL_TEMPLATE_INFO (target
);
22190 tmpl
= TI_TEMPLATE (tinfo
);
22191 args
= TI_ARGS (tinfo
);
22194 gcc_unreachable ();
22196 tree main_tmpl
= most_general_template (tmpl
);
22198 /* For determining which partial specialization to use, only the
22199 innermost args are interesting. */
22200 if (TMPL_ARGS_HAVE_MULTIPLE_LEVELS (args
))
22202 outer_args
= strip_innermost_template_args (args
, 1);
22203 args
= INNERMOST_TEMPLATE_ARGS (args
);
22206 for (t
= DECL_TEMPLATE_SPECIALIZATIONS (main_tmpl
); t
; t
= TREE_CHAIN (t
))
22209 tree spec_tmpl
= TREE_VALUE (t
);
22213 /* Substitute in the template args from the enclosing class. */
22214 ++processing_template_decl
;
22215 spec_tmpl
= tsubst (spec_tmpl
, outer_args
, tf_none
, NULL_TREE
);
22216 --processing_template_decl
;
22219 if (spec_tmpl
== error_mark_node
)
22220 return error_mark_node
;
22222 spec_args
= get_partial_spec_bindings (tmpl
, spec_tmpl
, args
);
22226 spec_args
= add_to_template_args (outer_args
, spec_args
);
22228 /* Keep the candidate only if the constraints are satisfied,
22229 or if we're not compiling with concepts. */
22231 || constraints_satisfied_p (spec_tmpl
, spec_args
))
22233 list
= tree_cons (spec_args
, TREE_VALUE (t
), list
);
22234 TREE_TYPE (list
) = TREE_TYPE (t
);
22242 ambiguous_p
= false;
22245 t
= TREE_CHAIN (t
);
22246 for (; t
; t
= TREE_CHAIN (t
))
22248 fate
= more_specialized_partial_spec (tmpl
, champ
, t
);
22255 t
= TREE_CHAIN (t
);
22258 ambiguous_p
= true;
22267 for (t
= list
; t
&& t
!= champ
; t
= TREE_CHAIN (t
))
22269 fate
= more_specialized_partial_spec (tmpl
, champ
, t
);
22272 ambiguous_p
= true;
22280 char *spaces
= NULL
;
22281 if (!(complain
& tf_error
))
22282 return error_mark_node
;
22283 if (TYPE_P (target
))
22284 error ("ambiguous template instantiation for %q#T", target
);
22286 error ("ambiguous template instantiation for %q#D", target
);
22287 str
= ngettext ("candidate is:", "candidates are:", list_length (list
));
22288 for (t
= list
; t
; t
= TREE_CHAIN (t
))
22290 tree subst
= build_tree_list (TREE_VALUE (t
), TREE_PURPOSE (t
));
22291 inform (DECL_SOURCE_LOCATION (TREE_VALUE (t
)),
22292 "%s %#qS", spaces
? spaces
: str
, subst
);
22293 spaces
= spaces
? spaces
: get_spaces (str
);
22296 return error_mark_node
;
22302 /* Explicitly instantiate DECL. */
22305 do_decl_instantiation (tree decl
, tree storage
)
22307 tree result
= NULL_TREE
;
22310 if (!decl
|| decl
== error_mark_node
)
22311 /* An error occurred, for which grokdeclarator has already issued
22312 an appropriate message. */
22314 else if (! DECL_LANG_SPECIFIC (decl
))
22316 error ("explicit instantiation of non-template %q#D", decl
);
22320 bool var_templ
= (DECL_TEMPLATE_INFO (decl
)
22321 && variable_template_p (DECL_TI_TEMPLATE (decl
)));
22323 if (VAR_P (decl
) && !var_templ
)
22325 /* There is an asymmetry here in the way VAR_DECLs and
22326 FUNCTION_DECLs are handled by grokdeclarator. In the case of
22327 the latter, the DECL we get back will be marked as a
22328 template instantiation, and the appropriate
22329 DECL_TEMPLATE_INFO will be set up. This does not happen for
22330 VAR_DECLs so we do the lookup here. Probably, grokdeclarator
22331 should handle VAR_DECLs as it currently handles
22333 if (!DECL_CLASS_SCOPE_P (decl
))
22335 error ("%qD is not a static data member of a class template", decl
);
22338 result
= lookup_field (DECL_CONTEXT (decl
), DECL_NAME (decl
), 0, false);
22339 if (!result
|| !VAR_P (result
))
22341 error ("no matching template for %qD found", decl
);
22344 if (!same_type_p (TREE_TYPE (result
), TREE_TYPE (decl
)))
22346 error ("type %qT for explicit instantiation %qD does not match "
22347 "declared type %qT", TREE_TYPE (result
), decl
,
22352 else if (TREE_CODE (decl
) != FUNCTION_DECL
&& !var_templ
)
22354 error ("explicit instantiation of %q#D", decl
);
22360 /* Check for various error cases. Note that if the explicit
22361 instantiation is valid the RESULT will currently be marked as an
22362 *implicit* instantiation; DECL_EXPLICIT_INSTANTIATION is not set
22363 until we get here. */
22365 if (DECL_TEMPLATE_SPECIALIZATION (result
))
22367 /* DR 259 [temp.spec].
22369 Both an explicit instantiation and a declaration of an explicit
22370 specialization shall not appear in a program unless the explicit
22371 instantiation follows a declaration of the explicit specialization.
22373 For a given set of template parameters, if an explicit
22374 instantiation of a template appears after a declaration of an
22375 explicit specialization for that template, the explicit
22376 instantiation has no effect. */
22379 else if (DECL_EXPLICIT_INSTANTIATION (result
))
22383 No program shall explicitly instantiate any template more
22386 We check DECL_NOT_REALLY_EXTERN so as not to complain when
22387 the first instantiation was `extern' and the second is not,
22388 and EXTERN_P for the opposite case. */
22389 if (DECL_NOT_REALLY_EXTERN (result
) && !extern_p
)
22390 permerror (input_location
, "duplicate explicit instantiation of %q#D", result
);
22391 /* If an "extern" explicit instantiation follows an ordinary
22392 explicit instantiation, the template is instantiated. */
22396 else if (!DECL_IMPLICIT_INSTANTIATION (result
))
22398 error ("no matching template for %qD found", result
);
22401 else if (!DECL_TEMPLATE_INFO (result
))
22403 permerror (input_location
, "explicit instantiation of non-template %q#D", result
);
22407 if (storage
== NULL_TREE
)
22409 else if (storage
== ridpointers
[(int) RID_EXTERN
])
22411 if (!in_system_header_at (input_location
) && (cxx_dialect
== cxx98
))
22412 pedwarn (input_location
, OPT_Wpedantic
,
22413 "ISO C++ 1998 forbids the use of %<extern%> on explicit "
22418 error ("storage class %qD applied to template instantiation", storage
);
22420 check_explicit_instantiation_namespace (result
);
22421 mark_decl_instantiated (result
, extern_p
);
22423 instantiate_decl (result
, /*defer_ok=*/true,
22424 /*expl_inst_class_mem_p=*/false);
22428 mark_class_instantiated (tree t
, int extern_p
)
22430 SET_CLASSTYPE_EXPLICIT_INSTANTIATION (t
);
22431 SET_CLASSTYPE_INTERFACE_KNOWN (t
);
22432 CLASSTYPE_INTERFACE_ONLY (t
) = extern_p
;
22433 TYPE_DECL_SUPPRESS_DEBUG (TYPE_NAME (t
)) = extern_p
;
22436 CLASSTYPE_DEBUG_REQUESTED (t
) = 1;
22437 rest_of_type_compilation (t
, 1);
22441 /* Called from do_type_instantiation through binding_table_foreach to
22442 do recursive instantiation for the type bound in ENTRY. */
22444 bt_instantiate_type_proc (binding_entry entry
, void *data
)
22446 tree storage
= *(tree
*) data
;
22448 if (MAYBE_CLASS_TYPE_P (entry
->type
)
22449 && !uses_template_parms (CLASSTYPE_TI_ARGS (entry
->type
)))
22450 do_type_instantiation (TYPE_MAIN_DECL (entry
->type
), storage
, 0);
22453 /* Perform an explicit instantiation of template class T. STORAGE, if
22454 non-null, is the RID for extern, inline or static. COMPLAIN is
22455 nonzero if this is called from the parser, zero if called recursively,
22456 since the standard is unclear (as detailed below). */
22459 do_type_instantiation (tree t
, tree storage
, tsubst_flags_t complain
)
22464 int previous_instantiation_extern_p
= 0;
22466 if (TREE_CODE (t
) == TYPE_DECL
)
22469 if (! CLASS_TYPE_P (t
) || ! CLASSTYPE_TEMPLATE_INFO (t
))
22472 (TYPE_TEMPLATE_INFO (t
)) ? TYPE_TI_TEMPLATE (t
) : NULL
;
22474 error ("explicit instantiation of non-class template %qD", tmpl
);
22476 error ("explicit instantiation of non-template type %qT", t
);
22482 if (!COMPLETE_TYPE_P (t
))
22484 if (complain
& tf_error
)
22485 error ("explicit instantiation of %q#T before definition of template",
22490 if (storage
!= NULL_TREE
)
22492 if (!in_system_header_at (input_location
))
22494 if (storage
== ridpointers
[(int) RID_EXTERN
])
22496 if (cxx_dialect
== cxx98
)
22497 pedwarn (input_location
, OPT_Wpedantic
,
22498 "ISO C++ 1998 forbids the use of %<extern%> on "
22499 "explicit instantiations");
22502 pedwarn (input_location
, OPT_Wpedantic
,
22503 "ISO C++ forbids the use of %qE"
22504 " on explicit instantiations", storage
);
22507 if (storage
== ridpointers
[(int) RID_INLINE
])
22509 else if (storage
== ridpointers
[(int) RID_EXTERN
])
22511 else if (storage
== ridpointers
[(int) RID_STATIC
])
22515 error ("storage class %qD applied to template instantiation",
22521 if (CLASSTYPE_TEMPLATE_SPECIALIZATION (t
))
22523 /* DR 259 [temp.spec].
22525 Both an explicit instantiation and a declaration of an explicit
22526 specialization shall not appear in a program unless the explicit
22527 instantiation follows a declaration of the explicit specialization.
22529 For a given set of template parameters, if an explicit
22530 instantiation of a template appears after a declaration of an
22531 explicit specialization for that template, the explicit
22532 instantiation has no effect. */
22535 else if (CLASSTYPE_EXPLICIT_INSTANTIATION (t
))
22539 No program shall explicitly instantiate any template more
22542 If PREVIOUS_INSTANTIATION_EXTERN_P, then the first explicit
22543 instantiation was `extern'. If EXTERN_P then the second is.
22544 These cases are OK. */
22545 previous_instantiation_extern_p
= CLASSTYPE_INTERFACE_ONLY (t
);
22547 if (!previous_instantiation_extern_p
&& !extern_p
22548 && (complain
& tf_error
))
22549 permerror (input_location
, "duplicate explicit instantiation of %q#T", t
);
22551 /* If we've already instantiated the template, just return now. */
22552 if (!CLASSTYPE_INTERFACE_ONLY (t
))
22556 check_explicit_instantiation_namespace (TYPE_NAME (t
));
22557 mark_class_instantiated (t
, extern_p
);
22562 /* In contrast to implicit instantiation, where only the
22563 declarations, and not the definitions, of members are
22564 instantiated, we have here:
22568 The explicit instantiation of a class template specialization
22569 implies the instantiation of all of its members not
22570 previously explicitly specialized in the translation unit
22571 containing the explicit instantiation.
22573 Of course, we can't instantiate member template classes, since we
22574 don't have any arguments for them. Note that the standard is
22575 unclear on whether the instantiation of the members are
22576 *explicit* instantiations or not. However, the most natural
22577 interpretation is that it should be an explicit
22579 for (tree fld
= TYPE_FIELDS (t
); fld
; fld
= DECL_CHAIN (fld
))
22581 || (TREE_CODE (fld
) == FUNCTION_DECL
22583 && user_provided_p (fld
)))
22584 && DECL_TEMPLATE_INSTANTIATION (fld
))
22586 mark_decl_instantiated (fld
, extern_p
);
22588 instantiate_decl (fld
, /*defer_ok=*/true,
22589 /*expl_inst_class_mem_p=*/true);
22592 if (CLASSTYPE_NESTED_UTDS (t
))
22593 binding_table_foreach (CLASSTYPE_NESTED_UTDS (t
),
22594 bt_instantiate_type_proc
, &storage
);
22597 /* Given a function DECL, which is a specialization of TMPL, modify
22598 DECL to be a re-instantiation of TMPL with the same template
22599 arguments. TMPL should be the template into which tsubst'ing
22600 should occur for DECL, not the most general template.
22602 One reason for doing this is a scenario like this:
22605 void f(const T&, int i);
22607 void g() { f(3, 7); }
22610 void f(const T& t, const int i) { }
22612 Note that when the template is first instantiated, with
22613 instantiate_template, the resulting DECL will have no name for the
22614 first parameter, and the wrong type for the second. So, when we go
22615 to instantiate the DECL, we regenerate it. */
22618 regenerate_decl_from_template (tree decl
, tree tmpl
, tree args
)
22620 /* The arguments used to instantiate DECL, from the most general
22624 code_pattern
= DECL_TEMPLATE_RESULT (tmpl
);
22626 /* Make sure that we can see identifiers, and compute access
22628 push_access_scope (decl
);
22630 if (TREE_CODE (decl
) == FUNCTION_DECL
)
22638 args_depth
= TMPL_ARGS_DEPTH (args
);
22639 parms_depth
= TMPL_PARMS_DEPTH (DECL_TEMPLATE_PARMS (tmpl
));
22640 if (args_depth
> parms_depth
)
22641 args
= get_innermost_template_args (args
, parms_depth
);
22643 specs
= tsubst_exception_specification (TREE_TYPE (code_pattern
),
22644 args
, tf_error
, NULL_TREE
,
22645 /*defer_ok*/false);
22646 if (specs
&& specs
!= error_mark_node
)
22647 TREE_TYPE (decl
) = build_exception_variant (TREE_TYPE (decl
),
22650 /* Merge parameter declarations. */
22651 decl_parm
= skip_artificial_parms_for (decl
,
22652 DECL_ARGUMENTS (decl
));
22654 = skip_artificial_parms_for (code_pattern
,
22655 DECL_ARGUMENTS (code_pattern
));
22656 while (decl_parm
&& !DECL_PACK_P (pattern_parm
))
22661 if (DECL_NAME (decl_parm
) != DECL_NAME (pattern_parm
))
22662 DECL_NAME (decl_parm
) = DECL_NAME (pattern_parm
);
22663 parm_type
= tsubst (TREE_TYPE (pattern_parm
), args
, tf_error
,
22665 parm_type
= type_decays_to (parm_type
);
22666 if (!same_type_p (TREE_TYPE (decl_parm
), parm_type
))
22667 TREE_TYPE (decl_parm
) = parm_type
;
22668 attributes
= DECL_ATTRIBUTES (pattern_parm
);
22669 if (DECL_ATTRIBUTES (decl_parm
) != attributes
)
22671 DECL_ATTRIBUTES (decl_parm
) = attributes
;
22672 cplus_decl_attributes (&decl_parm
, attributes
, /*flags=*/0);
22674 decl_parm
= DECL_CHAIN (decl_parm
);
22675 pattern_parm
= DECL_CHAIN (pattern_parm
);
22677 /* Merge any parameters that match with the function parameter
22679 if (pattern_parm
&& DECL_PACK_P (pattern_parm
))
22682 tree expanded_types
;
22683 /* Expand the TYPE_PACK_EXPANSION that provides the types for
22684 the parameters in this function parameter pack. */
22685 expanded_types
= tsubst_pack_expansion (TREE_TYPE (pattern_parm
),
22686 args
, tf_error
, NULL_TREE
);
22687 len
= TREE_VEC_LENGTH (expanded_types
);
22688 for (i
= 0; i
< len
; i
++)
22693 if (DECL_NAME (decl_parm
) != DECL_NAME (pattern_parm
))
22694 /* Rename the parameter to include the index. */
22695 DECL_NAME (decl_parm
) =
22696 make_ith_pack_parameter_name (DECL_NAME (pattern_parm
), i
);
22697 parm_type
= TREE_VEC_ELT (expanded_types
, i
);
22698 parm_type
= type_decays_to (parm_type
);
22699 if (!same_type_p (TREE_TYPE (decl_parm
), parm_type
))
22700 TREE_TYPE (decl_parm
) = parm_type
;
22701 attributes
= DECL_ATTRIBUTES (pattern_parm
);
22702 if (DECL_ATTRIBUTES (decl_parm
) != attributes
)
22704 DECL_ATTRIBUTES (decl_parm
) = attributes
;
22705 cplus_decl_attributes (&decl_parm
, attributes
, /*flags=*/0);
22707 decl_parm
= DECL_CHAIN (decl_parm
);
22710 /* Merge additional specifiers from the CODE_PATTERN. */
22711 if (DECL_DECLARED_INLINE_P (code_pattern
)
22712 && !DECL_DECLARED_INLINE_P (decl
))
22713 DECL_DECLARED_INLINE_P (decl
) = 1;
22715 else if (VAR_P (decl
))
22717 start_lambda_scope (decl
);
22718 DECL_INITIAL (decl
) =
22719 tsubst_expr (DECL_INITIAL (code_pattern
), args
,
22720 tf_error
, DECL_TI_TEMPLATE (decl
),
22721 /*integral_constant_expression_p=*/false);
22722 finish_lambda_scope ();
22723 if (VAR_HAD_UNKNOWN_BOUND (decl
))
22724 TREE_TYPE (decl
) = tsubst (TREE_TYPE (code_pattern
), args
,
22725 tf_error
, DECL_TI_TEMPLATE (decl
));
22728 gcc_unreachable ();
22730 pop_access_scope (decl
);
22733 /* Return the TEMPLATE_DECL into which DECL_TI_ARGS(DECL) should be
22734 substituted to get DECL. */
22737 template_for_substitution (tree decl
)
22739 tree tmpl
= DECL_TI_TEMPLATE (decl
);
22741 /* Set TMPL to the template whose DECL_TEMPLATE_RESULT is the pattern
22742 for the instantiation. This is not always the most general
22743 template. Consider, for example:
22746 struct S { template <class U> void f();
22747 template <> void f<int>(); };
22749 and an instantiation of S<double>::f<int>. We want TD to be the
22750 specialization S<T>::f<int>, not the more general S<T>::f<U>. */
22751 while (/* An instantiation cannot have a definition, so we need a
22752 more general template. */
22753 DECL_TEMPLATE_INSTANTIATION (tmpl
)
22754 /* We must also deal with friend templates. Given:
22756 template <class T> struct S {
22757 template <class U> friend void f() {};
22760 S<int>::f<U> say, is not an instantiation of S<T>::f<U>,
22761 so far as the language is concerned, but that's still
22762 where we get the pattern for the instantiation from. On
22763 other hand, if the definition comes outside the class, say:
22765 template <class T> struct S {
22766 template <class U> friend void f();
22768 template <class U> friend void f() {}
22770 we don't need to look any further. That's what the check for
22771 DECL_INITIAL is for. */
22772 || (TREE_CODE (decl
) == FUNCTION_DECL
22773 && DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (tmpl
)
22774 && !DECL_INITIAL (DECL_TEMPLATE_RESULT (tmpl
))))
22776 /* The present template, TD, should not be a definition. If it
22777 were a definition, we should be using it! Note that we
22778 cannot restructure the loop to just keep going until we find
22779 a template with a definition, since that might go too far if
22780 a specialization was declared, but not defined. */
22782 /* Fetch the more general template. */
22783 tmpl
= DECL_TI_TEMPLATE (tmpl
);
22789 /* Returns true if we need to instantiate this template instance even if we
22790 know we aren't going to emit it. */
22793 always_instantiate_p (tree decl
)
22795 /* We always instantiate inline functions so that we can inline them. An
22796 explicit instantiation declaration prohibits implicit instantiation of
22797 non-inline functions. With high levels of optimization, we would
22798 normally inline non-inline functions -- but we're not allowed to do
22799 that for "extern template" functions. Therefore, we check
22800 DECL_DECLARED_INLINE_P, rather than possibly_inlined_p. */
22801 return ((TREE_CODE (decl
) == FUNCTION_DECL
22802 && (DECL_DECLARED_INLINE_P (decl
)
22803 || type_uses_auto (TREE_TYPE (TREE_TYPE (decl
)))))
22804 /* And we need to instantiate static data members so that
22805 their initializers are available in integral constant
22808 && decl_maybe_constant_var_p (decl
)));
22811 /* If FN has a noexcept-specifier that hasn't been instantiated yet,
22812 instantiate it now, modifying TREE_TYPE (fn). Returns false on
22813 error, true otherwise. */
22816 maybe_instantiate_noexcept (tree fn
, tsubst_flags_t complain
)
22818 tree fntype
, spec
, noex
, clone
;
22820 /* Don't instantiate a noexcept-specification from template context. */
22821 if (processing_template_decl
)
22824 if (DECL_CLONED_FUNCTION_P (fn
))
22825 fn
= DECL_CLONED_FUNCTION (fn
);
22826 fntype
= TREE_TYPE (fn
);
22827 spec
= TYPE_RAISES_EXCEPTIONS (fntype
);
22829 if (!spec
|| !TREE_PURPOSE (spec
))
22832 noex
= TREE_PURPOSE (spec
);
22834 if (TREE_CODE (noex
) == DEFERRED_NOEXCEPT
)
22836 static hash_set
<tree
>* fns
= new hash_set
<tree
>;
22837 bool added
= false;
22838 if (DEFERRED_NOEXCEPT_PATTERN (noex
) == NULL_TREE
)
22839 spec
= get_defaulted_eh_spec (fn
, complain
);
22840 else if (!(added
= !fns
->add (fn
)))
22842 /* If hash_set::add returns true, the element was already there. */
22843 location_t loc
= EXPR_LOC_OR_LOC (DEFERRED_NOEXCEPT_PATTERN (noex
),
22844 DECL_SOURCE_LOCATION (fn
));
22846 "exception specification of %qD depends on itself",
22848 spec
= noexcept_false_spec
;
22850 else if (push_tinst_level (fn
))
22852 push_access_scope (fn
);
22853 push_deferring_access_checks (dk_no_deferred
);
22854 input_location
= DECL_SOURCE_LOCATION (fn
);
22855 noex
= tsubst_copy_and_build (DEFERRED_NOEXCEPT_PATTERN (noex
),
22856 DEFERRED_NOEXCEPT_ARGS (noex
),
22857 tf_warning_or_error
, fn
,
22858 /*function_p=*/false,
22859 /*integral_constant_expression_p=*/true);
22860 pop_deferring_access_checks ();
22861 pop_access_scope (fn
);
22862 pop_tinst_level ();
22863 spec
= build_noexcept_spec (noex
, tf_warning_or_error
);
22864 if (spec
== error_mark_node
)
22865 spec
= noexcept_false_spec
;
22868 spec
= noexcept_false_spec
;
22873 if (spec
== error_mark_node
)
22876 TREE_TYPE (fn
) = build_exception_variant (fntype
, spec
);
22879 FOR_EACH_CLONE (clone
, fn
)
22881 if (TREE_TYPE (clone
) == fntype
)
22882 TREE_TYPE (clone
) = TREE_TYPE (fn
);
22884 TREE_TYPE (clone
) = build_exception_variant (TREE_TYPE (clone
), spec
);
22890 /* We're starting to process the function INST, an instantiation of PATTERN;
22891 add their parameters to local_specializations. */
22894 register_parameter_specializations (tree pattern
, tree inst
)
22896 tree tmpl_parm
= DECL_ARGUMENTS (pattern
);
22897 tree spec_parm
= DECL_ARGUMENTS (inst
);
22898 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (inst
))
22900 register_local_specialization (spec_parm
, tmpl_parm
);
22901 spec_parm
= skip_artificial_parms_for (inst
, spec_parm
);
22902 tmpl_parm
= skip_artificial_parms_for (pattern
, tmpl_parm
);
22904 for (; tmpl_parm
; tmpl_parm
= DECL_CHAIN (tmpl_parm
))
22906 if (!DECL_PACK_P (tmpl_parm
))
22908 register_local_specialization (spec_parm
, tmpl_parm
);
22909 spec_parm
= DECL_CHAIN (spec_parm
);
22913 /* Register the (value) argument pack as a specialization of
22914 TMPL_PARM, then move on. */
22915 tree argpack
= extract_fnparm_pack (tmpl_parm
, &spec_parm
);
22916 register_local_specialization (argpack
, tmpl_parm
);
22919 gcc_assert (!spec_parm
);
22922 /* Produce the definition of D, a _DECL generated from a template. If
22923 DEFER_OK is true, then we don't have to actually do the
22924 instantiation now; we just have to do it sometime. Normally it is
22925 an error if this is an explicit instantiation but D is undefined.
22926 EXPL_INST_CLASS_MEM_P is true iff D is a member of an explicitly
22927 instantiated class template. */
22930 instantiate_decl (tree d
, bool defer_ok
, bool expl_inst_class_mem_p
)
22932 tree tmpl
= DECL_TI_TEMPLATE (d
);
22939 bool pattern_defined
;
22940 location_t saved_loc
= input_location
;
22941 int saved_unevaluated_operand
= cp_unevaluated_operand
;
22942 int saved_inhibit_evaluation_warnings
= c_inhibit_evaluation_warnings
;
22946 /* This function should only be used to instantiate templates for
22947 functions and static member variables. */
22948 gcc_assert (VAR_OR_FUNCTION_DECL_P (d
));
22950 /* A concept is never instantiated. */
22951 gcc_assert (!DECL_DECLARED_CONCEPT_P (d
));
22953 /* Variables are never deferred; if instantiation is required, they
22954 are instantiated right away. That allows for better code in the
22955 case that an expression refers to the value of the variable --
22956 if the variable has a constant value the referring expression can
22957 take advantage of that fact. */
22961 /* Don't instantiate cloned functions. Instead, instantiate the
22962 functions they cloned. */
22963 if (TREE_CODE (d
) == FUNCTION_DECL
&& DECL_CLONED_FUNCTION_P (d
))
22964 d
= DECL_CLONED_FUNCTION (d
);
22966 if (DECL_TEMPLATE_INSTANTIATED (d
)
22967 || (TREE_CODE (d
) == FUNCTION_DECL
22968 && DECL_DEFAULTED_FN (d
) && DECL_INITIAL (d
))
22969 || DECL_TEMPLATE_SPECIALIZATION (d
))
22970 /* D has already been instantiated or explicitly specialized, so
22971 there's nothing for us to do here.
22973 It might seem reasonable to check whether or not D is an explicit
22974 instantiation, and, if so, stop here. But when an explicit
22975 instantiation is deferred until the end of the compilation,
22976 DECL_EXPLICIT_INSTANTIATION is set, even though we still need to do
22977 the instantiation. */
22980 /* Check to see whether we know that this template will be
22981 instantiated in some other file, as with "extern template"
22983 external_p
= (DECL_INTERFACE_KNOWN (d
) && DECL_REALLY_EXTERN (d
));
22985 /* In general, we do not instantiate such templates. */
22986 if (external_p
&& !always_instantiate_p (d
))
22989 gen_tmpl
= most_general_template (tmpl
);
22990 gen_args
= DECL_TI_ARGS (d
);
22992 if (tmpl
!= gen_tmpl
)
22993 /* We should already have the extra args. */
22994 gcc_assert (TMPL_PARMS_DEPTH (DECL_TEMPLATE_PARMS (gen_tmpl
))
22995 == TMPL_ARGS_DEPTH (gen_args
));
22996 /* And what's in the hash table should match D. */
22997 gcc_assert ((spec
= retrieve_specialization (gen_tmpl
, gen_args
, 0)) == d
22998 || spec
== NULL_TREE
);
23000 /* This needs to happen before any tsubsting. */
23001 if (! push_tinst_level (d
))
23004 timevar_push (TV_TEMPLATE_INST
);
23006 /* Set TD to the template whose DECL_TEMPLATE_RESULT is the pattern
23007 for the instantiation. */
23008 td
= template_for_substitution (d
);
23013 /* Look up an explicit specialization, if any. */
23014 tree tid
= lookup_template_variable (gen_tmpl
, gen_args
);
23015 tree elt
= most_specialized_partial_spec (tid
, tf_warning_or_error
);
23016 if (elt
&& elt
!= error_mark_node
)
23018 td
= TREE_VALUE (elt
);
23019 args
= TREE_PURPOSE (elt
);
23023 code_pattern
= DECL_TEMPLATE_RESULT (td
);
23025 /* We should never be trying to instantiate a member of a class
23026 template or partial specialization. */
23027 gcc_assert (d
!= code_pattern
);
23029 if ((DECL_NAMESPACE_SCOPE_P (d
) && !DECL_INITIALIZED_IN_CLASS_P (d
))
23030 || DECL_TEMPLATE_SPECIALIZATION (td
))
23031 /* In the case of a friend template whose definition is provided
23032 outside the class, we may have too many arguments. Drop the
23033 ones we don't need. The same is true for specializations. */
23034 args
= get_innermost_template_args
23035 (args
, TMPL_PARMS_DEPTH (DECL_TEMPLATE_PARMS (td
)));
23037 if (TREE_CODE (d
) == FUNCTION_DECL
)
23039 deleted_p
= DECL_DELETED_FN (code_pattern
);
23040 pattern_defined
= ((DECL_SAVED_TREE (code_pattern
) != NULL_TREE
23041 && DECL_INITIAL (code_pattern
) != error_mark_node
)
23042 || DECL_DEFAULTED_OUTSIDE_CLASS_P (code_pattern
)
23048 if (DECL_CLASS_SCOPE_P (code_pattern
))
23049 pattern_defined
= (! DECL_IN_AGGR_P (code_pattern
)
23050 || DECL_INLINE_VAR_P (code_pattern
));
23052 pattern_defined
= ! DECL_EXTERNAL (code_pattern
);
23055 /* We may be in the middle of deferred access check. Disable it now. */
23056 push_deferring_access_checks (dk_no_deferred
);
23058 /* Unless an explicit instantiation directive has already determined
23059 the linkage of D, remember that a definition is available for
23061 if (pattern_defined
23062 && !DECL_INTERFACE_KNOWN (d
)
23063 && !DECL_NOT_REALLY_EXTERN (d
))
23064 mark_definable (d
);
23066 DECL_SOURCE_LOCATION (td
) = DECL_SOURCE_LOCATION (code_pattern
);
23067 DECL_SOURCE_LOCATION (d
) = DECL_SOURCE_LOCATION (code_pattern
);
23068 input_location
= DECL_SOURCE_LOCATION (d
);
23070 /* If D is a member of an explicitly instantiated class template,
23071 and no definition is available, treat it like an implicit
23073 if (!pattern_defined
&& expl_inst_class_mem_p
23074 && DECL_EXPLICIT_INSTANTIATION (d
))
23076 /* Leave linkage flags alone on instantiations with anonymous
23078 if (TREE_PUBLIC (d
))
23080 DECL_NOT_REALLY_EXTERN (d
) = 0;
23081 DECL_INTERFACE_KNOWN (d
) = 0;
23083 SET_DECL_IMPLICIT_INSTANTIATION (d
);
23086 /* Defer all other templates, unless we have been explicitly
23087 forbidden from doing so. */
23088 if (/* If there is no definition, we cannot instantiate the
23091 /* If it's OK to postpone instantiation, do so. */
23093 /* If this is a static data member that will be defined
23094 elsewhere, we don't want to instantiate the entire data
23095 member, but we do want to instantiate the initializer so that
23096 we can substitute that elsewhere. */
23097 || (external_p
&& VAR_P (d
))
23098 /* Handle here a deleted function too, avoid generating
23099 its body (c++/61080). */
23102 /* The definition of the static data member is now required so
23103 we must substitute the initializer. */
23105 && !DECL_INITIAL (d
)
23106 && DECL_INITIAL (code_pattern
))
23110 bool const_init
= false;
23111 bool enter_context
= DECL_CLASS_SCOPE_P (d
);
23113 ns
= decl_namespace_context (d
);
23114 push_nested_namespace (ns
);
23116 push_nested_class (DECL_CONTEXT (d
));
23117 init
= tsubst_expr (DECL_INITIAL (code_pattern
),
23119 tf_warning_or_error
, NULL_TREE
,
23120 /*integral_constant_expression_p=*/false);
23121 /* If instantiating the initializer involved instantiating this
23122 again, don't call cp_finish_decl twice. */
23123 if (!DECL_INITIAL (d
))
23125 /* Make sure the initializer is still constant, in case of
23126 circular dependency (template/instantiate6.C). */
23128 = DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (code_pattern
);
23129 cp_finish_decl (d
, init
, /*init_const_expr_p=*/const_init
,
23130 /*asmspec_tree=*/NULL_TREE
,
23131 LOOKUP_ONLYCONVERTING
);
23134 pop_nested_class ();
23135 pop_nested_namespace (ns
);
23138 /* We restore the source position here because it's used by
23139 add_pending_template. */
23140 input_location
= saved_loc
;
23142 if (at_eof
&& !pattern_defined
23143 && DECL_EXPLICIT_INSTANTIATION (d
)
23144 && DECL_NOT_REALLY_EXTERN (d
))
23147 The definition of a non-exported function template, a
23148 non-exported member function template, or a non-exported
23149 member function or static data member of a class template
23150 shall be present in every translation unit in which it is
23151 explicitly instantiated. */
23152 permerror (input_location
, "explicit instantiation of %qD "
23153 "but no definition available", d
);
23155 /* If we're in unevaluated context, we just wanted to get the
23156 constant value; this isn't an odr use, so don't queue
23157 a full instantiation. */
23158 if (cp_unevaluated_operand
!= 0)
23160 /* ??? Historically, we have instantiated inline functions, even
23161 when marked as "extern template". */
23162 if (!(external_p
&& VAR_P (d
)))
23163 add_pending_template (d
);
23166 /* Tell the repository that D is available in this translation unit
23167 -- and see if it is supposed to be instantiated here. */
23168 if (TREE_PUBLIC (d
) && !DECL_REALLY_EXTERN (d
) && !repo_emit_p (d
))
23170 /* In a PCH file, despite the fact that the repository hasn't
23171 requested instantiation in the PCH it is still possible that
23172 an instantiation will be required in a file that includes the
23175 add_pending_template (d
);
23176 /* Instantiate inline functions so that the inliner can do its
23177 job, even though we'll not be emitting a copy of this
23179 if (!(TREE_CODE (d
) == FUNCTION_DECL
&& possibly_inlined_p (d
)))
23183 bool push_to_top
, nested
;
23185 fn_context
= decl_function_context (d
);
23186 nested
= current_function_decl
!= NULL_TREE
;
23187 push_to_top
= !(nested
&& fn_context
== current_function_decl
);
23189 vec
<tree
> omp_privatization_save
;
23191 save_omp_privatization_clauses (omp_privatization_save
);
23194 push_to_top_level ();
23197 push_function_context ();
23198 cp_unevaluated_operand
= 0;
23199 c_inhibit_evaluation_warnings
= 0;
23202 /* Mark D as instantiated so that recursive calls to
23203 instantiate_decl do not try to instantiate it again. */
23204 DECL_TEMPLATE_INSTANTIATED (d
) = 1;
23206 /* Regenerate the declaration in case the template has been modified
23207 by a subsequent redeclaration. */
23208 regenerate_decl_from_template (d
, td
, args
);
23210 /* We already set the file and line above. Reset them now in case
23211 they changed as a result of calling regenerate_decl_from_template. */
23212 input_location
= DECL_SOURCE_LOCATION (d
);
23217 bool const_init
= false;
23219 /* Clear out DECL_RTL; whatever was there before may not be right
23220 since we've reset the type of the declaration. */
23221 SET_DECL_RTL (d
, NULL
);
23222 DECL_IN_AGGR_P (d
) = 0;
23224 /* The initializer is placed in DECL_INITIAL by
23225 regenerate_decl_from_template so we don't need to
23226 push/pop_access_scope again here. Pull it out so that
23227 cp_finish_decl can process it. */
23228 init
= DECL_INITIAL (d
);
23229 DECL_INITIAL (d
) = NULL_TREE
;
23230 DECL_INITIALIZED_P (d
) = 0;
23232 /* Clear DECL_EXTERNAL so that cp_finish_decl will process the
23233 initializer. That function will defer actual emission until
23234 we have a chance to determine linkage. */
23235 DECL_EXTERNAL (d
) = 0;
23237 /* Enter the scope of D so that access-checking works correctly. */
23238 bool enter_context
= DECL_CLASS_SCOPE_P (d
);
23240 push_nested_class (DECL_CONTEXT (d
));
23242 const_init
= DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (code_pattern
);
23243 cp_finish_decl (d
, init
, const_init
, NULL_TREE
, 0);
23246 pop_nested_class ();
23248 if (variable_template_p (gen_tmpl
))
23249 note_variable_template_instantiation (d
);
23251 else if (TREE_CODE (d
) == FUNCTION_DECL
&& DECL_DEFAULTED_FN (code_pattern
))
23252 synthesize_method (d
);
23253 else if (TREE_CODE (d
) == FUNCTION_DECL
)
23255 /* Set up the list of local specializations. */
23256 local_specialization_stack
lss (push_to_top
? lss_blank
: lss_copy
);
23257 tree block
= NULL_TREE
;
23259 /* Set up context. */
23260 if (DECL_OMP_DECLARE_REDUCTION_P (code_pattern
)
23261 && TREE_CODE (DECL_CONTEXT (code_pattern
)) == FUNCTION_DECL
)
23262 block
= push_stmt_list ();
23264 start_preparsed_function (d
, NULL_TREE
, SF_PRE_PARSED
);
23266 /* Some typedefs referenced from within the template code need to be
23267 access checked at template instantiation time, i.e now. These
23268 types were added to the template at parsing time. Let's get those
23269 and perform the access checks then. */
23270 perform_typedefs_access_check (DECL_TEMPLATE_RESULT (td
),
23273 /* Create substitution entries for the parameters. */
23274 register_parameter_specializations (code_pattern
, d
);
23276 /* Substitute into the body of the function. */
23277 if (DECL_OMP_DECLARE_REDUCTION_P (code_pattern
))
23278 tsubst_omp_udr (DECL_SAVED_TREE (code_pattern
), args
,
23279 tf_warning_or_error
, tmpl
);
23282 tsubst_expr (DECL_SAVED_TREE (code_pattern
), args
,
23283 tf_warning_or_error
, tmpl
,
23284 /*integral_constant_expression_p=*/false);
23286 /* Set the current input_location to the end of the function
23287 so that finish_function knows where we are. */
23289 = DECL_STRUCT_FUNCTION (code_pattern
)->function_end_locus
;
23291 /* Remember if we saw an infinite loop in the template. */
23292 current_function_infinite_loop
23293 = DECL_STRUCT_FUNCTION (code_pattern
)->language
->infinite_loop
;
23296 /* Finish the function. */
23297 if (DECL_OMP_DECLARE_REDUCTION_P (code_pattern
)
23298 && TREE_CODE (DECL_CONTEXT (code_pattern
)) == FUNCTION_DECL
)
23299 DECL_SAVED_TREE (d
) = pop_stmt_list (block
);
23302 d
= finish_function (/*inline_p=*/false);
23303 expand_or_defer_fn (d
);
23306 if (DECL_OMP_DECLARE_REDUCTION_P (code_pattern
))
23307 cp_check_omp_declare_reduction (d
);
23310 /* We're not deferring instantiation any more. */
23311 TI_PENDING_TEMPLATE_FLAG (DECL_TEMPLATE_INFO (d
)) = 0;
23314 pop_from_top_level ();
23316 pop_function_context ();
23319 restore_omp_privatization_clauses (omp_privatization_save
);
23322 pop_deferring_access_checks ();
23323 timevar_pop (TV_TEMPLATE_INST
);
23324 pop_tinst_level ();
23325 input_location
= saved_loc
;
23326 cp_unevaluated_operand
= saved_unevaluated_operand
;
23327 c_inhibit_evaluation_warnings
= saved_inhibit_evaluation_warnings
;
23332 /* Run through the list of templates that we wish we could
23333 instantiate, and instantiate any we can. RETRIES is the
23334 number of times we retry pending template instantiation. */
23337 instantiate_pending_templates (int retries
)
23340 location_t saved_loc
= input_location
;
23342 /* Instantiating templates may trigger vtable generation. This in turn
23343 may require further template instantiations. We place a limit here
23344 to avoid infinite loop. */
23345 if (pending_templates
&& retries
>= max_tinst_depth
)
23347 tree decl
= pending_templates
->tinst
->decl
;
23349 fatal_error (input_location
,
23350 "template instantiation depth exceeds maximum of %d"
23351 " instantiating %q+D, possibly from virtual table generation"
23352 " (use -ftemplate-depth= to increase the maximum)",
23353 max_tinst_depth
, decl
);
23354 if (TREE_CODE (decl
) == FUNCTION_DECL
)
23355 /* Pretend that we defined it. */
23356 DECL_INITIAL (decl
) = error_mark_node
;
23362 struct pending_template
**t
= &pending_templates
;
23363 struct pending_template
*last
= NULL
;
23367 tree instantiation
= reopen_tinst_level ((*t
)->tinst
);
23368 bool complete
= false;
23370 if (TYPE_P (instantiation
))
23372 if (!COMPLETE_TYPE_P (instantiation
))
23374 instantiate_class_template (instantiation
);
23375 if (CLASSTYPE_TEMPLATE_INSTANTIATION (instantiation
))
23376 for (tree fld
= TYPE_FIELDS (instantiation
);
23377 fld
; fld
= TREE_CHAIN (fld
))
23379 || (TREE_CODE (fld
) == FUNCTION_DECL
23380 && !DECL_ARTIFICIAL (fld
)))
23381 && DECL_TEMPLATE_INSTANTIATION (fld
))
23382 instantiate_decl (fld
,
23383 /*defer_ok=*/false,
23384 /*expl_inst_class_mem_p=*/false);
23386 if (COMPLETE_TYPE_P (instantiation
))
23390 complete
= COMPLETE_TYPE_P (instantiation
);
23394 if (!DECL_TEMPLATE_SPECIALIZATION (instantiation
)
23395 && !DECL_TEMPLATE_INSTANTIATED (instantiation
))
23398 = instantiate_decl (instantiation
,
23399 /*defer_ok=*/false,
23400 /*expl_inst_class_mem_p=*/false);
23401 if (DECL_TEMPLATE_INSTANTIATED (instantiation
))
23405 complete
= (DECL_TEMPLATE_SPECIALIZATION (instantiation
)
23406 || DECL_TEMPLATE_INSTANTIATED (instantiation
));
23410 /* If INSTANTIATION has been instantiated, then we don't
23411 need to consider it again in the future. */
23419 current_tinst_level
= NULL
;
23421 last_pending_template
= last
;
23423 while (reconsider
);
23425 input_location
= saved_loc
;
23428 /* Substitute ARGVEC into T, which is a list of initializers for
23429 either base class or a non-static data member. The TREE_PURPOSEs
23430 are DECLs, and the TREE_VALUEs are the initializer values. Used by
23431 instantiate_decl. */
23434 tsubst_initializer_list (tree t
, tree argvec
)
23436 tree inits
= NULL_TREE
;
23438 for (; t
; t
= TREE_CHAIN (t
))
23442 tree expanded_bases
= NULL_TREE
;
23443 tree expanded_arguments
= NULL_TREE
;
23446 if (TREE_CODE (TREE_PURPOSE (t
)) == TYPE_PACK_EXPANSION
)
23451 /* Expand the base class expansion type into separate base
23453 expanded_bases
= tsubst_pack_expansion (TREE_PURPOSE (t
), argvec
,
23454 tf_warning_or_error
,
23456 if (expanded_bases
== error_mark_node
)
23459 /* We'll be building separate TREE_LISTs of arguments for
23461 len
= TREE_VEC_LENGTH (expanded_bases
);
23462 expanded_arguments
= make_tree_vec (len
);
23463 for (i
= 0; i
< len
; i
++)
23464 TREE_VEC_ELT (expanded_arguments
, i
) = NULL_TREE
;
23466 /* Build a dummy EXPR_PACK_EXPANSION that will be used to
23467 expand each argument in the TREE_VALUE of t. */
23468 expr
= make_node (EXPR_PACK_EXPANSION
);
23469 PACK_EXPANSION_LOCAL_P (expr
) = true;
23470 PACK_EXPANSION_PARAMETER_PACKS (expr
) =
23471 PACK_EXPANSION_PARAMETER_PACKS (TREE_PURPOSE (t
));
23473 if (TREE_VALUE (t
) == void_type_node
)
23474 /* VOID_TYPE_NODE is used to indicate
23475 value-initialization. */
23477 for (i
= 0; i
< len
; i
++)
23478 TREE_VEC_ELT (expanded_arguments
, i
) = void_type_node
;
23482 /* Substitute parameter packs into each argument in the
23484 in_base_initializer
= 1;
23485 for (arg
= TREE_VALUE (t
); arg
; arg
= TREE_CHAIN (arg
))
23487 tree expanded_exprs
;
23489 /* Expand the argument. */
23490 SET_PACK_EXPANSION_PATTERN (expr
, TREE_VALUE (arg
));
23492 = tsubst_pack_expansion (expr
, argvec
,
23493 tf_warning_or_error
,
23495 if (expanded_exprs
== error_mark_node
)
23498 /* Prepend each of the expanded expressions to the
23499 corresponding TREE_LIST in EXPANDED_ARGUMENTS. */
23500 for (i
= 0; i
< len
; i
++)
23502 TREE_VEC_ELT (expanded_arguments
, i
) =
23503 tree_cons (NULL_TREE
,
23504 TREE_VEC_ELT (expanded_exprs
, i
),
23505 TREE_VEC_ELT (expanded_arguments
, i
));
23508 in_base_initializer
= 0;
23510 /* Reverse all of the TREE_LISTs in EXPANDED_ARGUMENTS,
23511 since we built them backwards. */
23512 for (i
= 0; i
< len
; i
++)
23514 TREE_VEC_ELT (expanded_arguments
, i
) =
23515 nreverse (TREE_VEC_ELT (expanded_arguments
, i
));
23520 for (i
= 0; i
< len
; ++i
)
23522 if (expanded_bases
)
23524 decl
= TREE_VEC_ELT (expanded_bases
, i
);
23525 decl
= expand_member_init (decl
);
23526 init
= TREE_VEC_ELT (expanded_arguments
, i
);
23531 decl
= tsubst_copy (TREE_PURPOSE (t
), argvec
,
23532 tf_warning_or_error
, NULL_TREE
);
23534 decl
= expand_member_init (decl
);
23535 if (decl
&& !DECL_P (decl
))
23536 in_base_initializer
= 1;
23538 init
= TREE_VALUE (t
);
23540 if (init
!= void_type_node
)
23541 init
= tsubst_expr (init
, argvec
,
23542 tf_warning_or_error
, NULL_TREE
,
23543 /*integral_constant_expression_p=*/false);
23544 if (init
== NULL_TREE
&& tmp
!= NULL_TREE
)
23545 /* If we had an initializer but it instantiated to nothing,
23546 value-initialize the object. This will only occur when
23547 the initializer was a pack expansion where the parameter
23548 packs used in that expansion were of length zero. */
23549 init
= void_type_node
;
23550 in_base_initializer
= 0;
23555 init
= build_tree_list (decl
, init
);
23556 TREE_CHAIN (init
) = inits
;
23564 /* Set CURRENT_ACCESS_SPECIFIER based on the protection of DECL. */
23567 set_current_access_from_decl (tree decl
)
23569 if (TREE_PRIVATE (decl
))
23570 current_access_specifier
= access_private_node
;
23571 else if (TREE_PROTECTED (decl
))
23572 current_access_specifier
= access_protected_node
;
23574 current_access_specifier
= access_public_node
;
23577 /* Instantiate an enumerated type. TAG is the template type, NEWTAG
23578 is the instantiation (which should have been created with
23579 start_enum) and ARGS are the template arguments to use. */
23582 tsubst_enum (tree tag
, tree newtag
, tree args
)
23586 if (SCOPED_ENUM_P (newtag
))
23587 begin_scope (sk_scoped_enum
, newtag
);
23589 for (e
= TYPE_VALUES (tag
); e
; e
= TREE_CHAIN (e
))
23594 decl
= TREE_VALUE (e
);
23595 /* Note that in a template enum, the TREE_VALUE is the
23596 CONST_DECL, not the corresponding INTEGER_CST. */
23597 value
= tsubst_expr (DECL_INITIAL (decl
),
23598 args
, tf_warning_or_error
, NULL_TREE
,
23599 /*integral_constant_expression_p=*/true);
23601 /* Give this enumeration constant the correct access. */
23602 set_current_access_from_decl (decl
);
23604 /* Actually build the enumerator itself. Here we're assuming that
23605 enumerators can't have dependent attributes. */
23606 build_enumerator (DECL_NAME (decl
), value
, newtag
,
23607 DECL_ATTRIBUTES (decl
), DECL_SOURCE_LOCATION (decl
));
23610 if (SCOPED_ENUM_P (newtag
))
23613 finish_enum_value_list (newtag
);
23614 finish_enum (newtag
);
23616 DECL_SOURCE_LOCATION (TYPE_NAME (newtag
))
23617 = DECL_SOURCE_LOCATION (TYPE_NAME (tag
));
23620 /* DECL is a FUNCTION_DECL that is a template specialization. Return
23621 its type -- but without substituting the innermost set of template
23622 arguments. So, innermost set of template parameters will appear in
23626 get_mostly_instantiated_function_type (tree decl
)
23628 /* For a function, DECL_TI_TEMPLATE is partially instantiated. */
23629 return TREE_TYPE (DECL_TI_TEMPLATE (decl
));
23632 /* Return truthvalue if we're processing a template different from
23633 the last one involved in diagnostics. */
23635 problematic_instantiation_changed (void)
23637 return current_tinst_level
!= last_error_tinst_level
;
23640 /* Remember current template involved in diagnostics. */
23642 record_last_problematic_instantiation (void)
23644 last_error_tinst_level
= current_tinst_level
;
23647 struct tinst_level
*
23648 current_instantiation (void)
23650 return current_tinst_level
;
23653 /* Return TRUE if current_function_decl is being instantiated, false
23657 instantiating_current_function_p (void)
23659 return (current_instantiation ()
23660 && current_instantiation ()->decl
== current_function_decl
);
23663 /* [temp.param] Check that template non-type parm TYPE is of an allowable
23664 type. Return false for ok, true for disallowed. Issue error and
23665 inform messages under control of COMPLAIN. */
23668 invalid_nontype_parm_type_p (tree type
, tsubst_flags_t complain
)
23670 if (INTEGRAL_OR_ENUMERATION_TYPE_P (type
))
23672 else if (POINTER_TYPE_P (type
))
23674 else if (TYPE_PTRMEM_P (type
))
23676 else if (TREE_CODE (type
) == TEMPLATE_TYPE_PARM
)
23678 else if (TREE_CODE (type
) == TYPENAME_TYPE
)
23680 else if (TREE_CODE (type
) == DECLTYPE_TYPE
)
23682 else if (TREE_CODE (type
) == NULLPTR_TYPE
)
23684 /* A bound template template parm could later be instantiated to have a valid
23685 nontype parm type via an alias template. */
23686 else if (cxx_dialect
>= cxx11
23687 && TREE_CODE (type
) == BOUND_TEMPLATE_TEMPLATE_PARM
)
23690 if (complain
& tf_error
)
23692 if (type
== error_mark_node
)
23693 inform (input_location
, "invalid template non-type parameter");
23695 error ("%q#T is not a valid type for a template non-type parameter",
23701 /* Returns TRUE if TYPE is dependent, in the sense of [temp.dep.type].
23702 Assumes that TYPE really is a type, and not the ERROR_MARK_NODE.*/
23705 dependent_type_p_r (tree type
)
23711 A type is dependent if it is:
23713 -- a template parameter. Template template parameters are types
23714 for us (since TYPE_P holds true for them) so we handle
23716 if (TREE_CODE (type
) == TEMPLATE_TYPE_PARM
23717 || TREE_CODE (type
) == TEMPLATE_TEMPLATE_PARM
)
23719 /* -- a qualified-id with a nested-name-specifier which contains a
23720 class-name that names a dependent type or whose unqualified-id
23721 names a dependent type. */
23722 if (TREE_CODE (type
) == TYPENAME_TYPE
)
23725 /* An alias template specialization can be dependent even if the
23726 resulting type is not. */
23727 if (dependent_alias_template_spec_p (type
))
23730 /* -- a cv-qualified type where the cv-unqualified type is
23732 No code is necessary for this bullet; the code below handles
23733 cv-qualified types, and we don't want to strip aliases with
23734 TYPE_MAIN_VARIANT because of DR 1558. */
23735 /* -- a compound type constructed from any dependent type. */
23736 if (TYPE_PTRMEM_P (type
))
23737 return (dependent_type_p (TYPE_PTRMEM_CLASS_TYPE (type
))
23738 || dependent_type_p (TYPE_PTRMEM_POINTED_TO_TYPE
23740 else if (TYPE_PTR_P (type
)
23741 || TREE_CODE (type
) == REFERENCE_TYPE
)
23742 return dependent_type_p (TREE_TYPE (type
));
23743 else if (TREE_CODE (type
) == FUNCTION_TYPE
23744 || TREE_CODE (type
) == METHOD_TYPE
)
23748 if (dependent_type_p (TREE_TYPE (type
)))
23750 for (arg_type
= TYPE_ARG_TYPES (type
);
23752 arg_type
= TREE_CHAIN (arg_type
))
23753 if (dependent_type_p (TREE_VALUE (arg_type
)))
23755 if (cxx_dialect
>= cxx17
)
23756 /* A value-dependent noexcept-specifier makes the type dependent. */
23757 if (tree spec
= TYPE_RAISES_EXCEPTIONS (type
))
23758 if (tree noex
= TREE_PURPOSE (spec
))
23759 /* Treat DEFERRED_NOEXCEPT as non-dependent, since it doesn't
23760 affect overload resolution and treating it as dependent breaks
23762 if (TREE_CODE (noex
) != DEFERRED_NOEXCEPT
23763 && value_dependent_expression_p (noex
))
23767 /* -- an array type constructed from any dependent type or whose
23768 size is specified by a constant expression that is
23771 We checked for type- and value-dependence of the bounds in
23772 compute_array_index_type, so TYPE_DEPENDENT_P is already set. */
23773 if (TREE_CODE (type
) == ARRAY_TYPE
)
23775 if (TYPE_DOMAIN (type
)
23776 && dependent_type_p (TYPE_DOMAIN (type
)))
23778 return dependent_type_p (TREE_TYPE (type
));
23781 /* -- a template-id in which either the template name is a template
23783 if (TREE_CODE (type
) == BOUND_TEMPLATE_TEMPLATE_PARM
)
23785 /* ... or any of the template arguments is a dependent type or
23786 an expression that is type-dependent or value-dependent. */
23787 else if (CLASS_TYPE_P (type
) && CLASSTYPE_TEMPLATE_INFO (type
)
23788 && (any_dependent_template_arguments_p
23789 (INNERMOST_TEMPLATE_ARGS (CLASSTYPE_TI_ARGS (type
)))))
23792 /* All TYPEOF_TYPEs, DECLTYPE_TYPEs, and UNDERLYING_TYPEs are
23793 dependent; if the argument of the `typeof' expression is not
23794 type-dependent, then it should already been have resolved. */
23795 if (TREE_CODE (type
) == TYPEOF_TYPE
23796 || TREE_CODE (type
) == DECLTYPE_TYPE
23797 || TREE_CODE (type
) == UNDERLYING_TYPE
)
23800 /* A template argument pack is dependent if any of its packed
23802 if (TREE_CODE (type
) == TYPE_ARGUMENT_PACK
)
23804 tree args
= ARGUMENT_PACK_ARGS (type
);
23805 int i
, len
= TREE_VEC_LENGTH (args
);
23806 for (i
= 0; i
< len
; ++i
)
23807 if (dependent_template_arg_p (TREE_VEC_ELT (args
, i
)))
23811 /* All TYPE_PACK_EXPANSIONs are dependent, because parameter packs must
23812 be template parameters. */
23813 if (TREE_CODE (type
) == TYPE_PACK_EXPANSION
)
23816 if (any_dependent_type_attributes_p (TYPE_ATTRIBUTES (type
)))
23819 /* The standard does not specifically mention types that are local
23820 to template functions or local classes, but they should be
23821 considered dependent too. For example:
23823 template <int I> void f() {
23828 The size of `E' cannot be known until the value of `I' has been
23829 determined. Therefore, `E' must be considered dependent. */
23830 scope
= TYPE_CONTEXT (type
);
23831 if (scope
&& TYPE_P (scope
))
23832 return dependent_type_p (scope
);
23833 /* Don't use type_dependent_expression_p here, as it can lead
23834 to infinite recursion trying to determine whether a lambda
23835 nested in a lambda is dependent (c++/47687). */
23836 else if (scope
&& TREE_CODE (scope
) == FUNCTION_DECL
23837 && DECL_LANG_SPECIFIC (scope
)
23838 && DECL_TEMPLATE_INFO (scope
)
23839 && (any_dependent_template_arguments_p
23840 (INNERMOST_TEMPLATE_ARGS (DECL_TI_ARGS (scope
)))))
23843 /* Other types are non-dependent. */
23847 /* Returns TRUE if TYPE is dependent, in the sense of
23848 [temp.dep.type]. Note that a NULL type is considered dependent. */
23851 dependent_type_p (tree type
)
23853 /* If there are no template parameters in scope, then there can't be
23854 any dependent types. */
23855 if (!processing_template_decl
)
23857 /* If we are not processing a template, then nobody should be
23858 providing us with a dependent type. */
23860 gcc_assert (TREE_CODE (type
) != TEMPLATE_TYPE_PARM
|| is_auto (type
));
23864 /* If the type is NULL, we have not computed a type for the entity
23865 in question; in that case, the type is dependent. */
23869 /* Erroneous types can be considered non-dependent. */
23870 if (type
== error_mark_node
)
23873 /* Getting here with global_type_node means we improperly called this
23874 function on the TREE_TYPE of an IDENTIFIER_NODE. */
23875 gcc_checking_assert (type
!= global_type_node
);
23877 /* If we have not already computed the appropriate value for TYPE,
23879 if (!TYPE_DEPENDENT_P_VALID (type
))
23881 TYPE_DEPENDENT_P (type
) = dependent_type_p_r (type
);
23882 TYPE_DEPENDENT_P_VALID (type
) = 1;
23885 return TYPE_DEPENDENT_P (type
);
23888 /* Returns TRUE if SCOPE is a dependent scope, in which we can't do any
23889 lookup. In other words, a dependent type that is not the current
23893 dependent_scope_p (tree scope
)
23895 return (scope
&& TYPE_P (scope
) && dependent_type_p (scope
)
23896 && !currently_open_class (scope
));
23899 /* T is a SCOPE_REF; return whether we need to consider it
23900 instantiation-dependent so that we can check access at instantiation
23901 time even though we know which member it resolves to. */
23904 instantiation_dependent_scope_ref_p (tree t
)
23906 if (DECL_P (TREE_OPERAND (t
, 1))
23907 && CLASS_TYPE_P (TREE_OPERAND (t
, 0))
23908 && accessible_in_template_p (TREE_OPERAND (t
, 0),
23909 TREE_OPERAND (t
, 1)))
23915 /* Returns TRUE if the EXPRESSION is value-dependent, in the sense of
23916 [temp.dep.constexpr]. EXPRESSION is already known to be a constant
23919 /* Note that this predicate is not appropriate for general expressions;
23920 only constant expressions (that satisfy potential_constant_expression)
23921 can be tested for value dependence. */
23924 value_dependent_expression_p (tree expression
)
23926 if (!processing_template_decl
|| expression
== NULL_TREE
)
23929 /* A type-dependent expression is also value-dependent. */
23930 if (type_dependent_expression_p (expression
))
23933 switch (TREE_CODE (expression
))
23936 /* A dependent member function of the current instantiation. */
23937 return dependent_type_p (BINFO_TYPE (BASELINK_BINFO (expression
)));
23939 case FUNCTION_DECL
:
23940 /* A dependent member function of the current instantiation. */
23941 if (DECL_CLASS_SCOPE_P (expression
)
23942 && dependent_type_p (DECL_CONTEXT (expression
)))
23946 case IDENTIFIER_NODE
:
23947 /* A name that has not been looked up -- must be dependent. */
23950 case TEMPLATE_PARM_INDEX
:
23951 /* A non-type template parm. */
23955 /* A non-type template parm. */
23956 if (DECL_TEMPLATE_PARM_P (expression
))
23958 return value_dependent_expression_p (DECL_INITIAL (expression
));
23961 /* A constant with literal type and is initialized
23962 with an expression that is value-dependent.
23964 Note that a non-dependent parenthesized initializer will have
23965 already been replaced with its constant value, so if we see
23966 a TREE_LIST it must be dependent. */
23967 if (DECL_INITIAL (expression
)
23968 && decl_constant_var_p (expression
)
23969 && (TREE_CODE (DECL_INITIAL (expression
)) == TREE_LIST
23970 /* cp_finish_decl doesn't fold reference initializers. */
23971 || TREE_CODE (TREE_TYPE (expression
)) == REFERENCE_TYPE
23972 || value_dependent_expression_p (DECL_INITIAL (expression
))))
23974 if (DECL_HAS_VALUE_EXPR_P (expression
))
23976 tree value_expr
= DECL_VALUE_EXPR (expression
);
23977 if (value_dependent_expression_p (value_expr
))
23982 case DYNAMIC_CAST_EXPR
:
23983 case STATIC_CAST_EXPR
:
23984 case CONST_CAST_EXPR
:
23985 case REINTERPRET_CAST_EXPR
:
23987 case IMPLICIT_CONV_EXPR
:
23988 /* These expressions are value-dependent if the type to which
23989 the cast occurs is dependent or the expression being casted
23990 is value-dependent. */
23992 tree type
= TREE_TYPE (expression
);
23994 if (dependent_type_p (type
))
23997 /* A functional cast has a list of operands. */
23998 expression
= TREE_OPERAND (expression
, 0);
24001 /* If there are no operands, it must be an expression such
24002 as "int()". This should not happen for aggregate types
24003 because it would form non-constant expressions. */
24004 gcc_assert (cxx_dialect
>= cxx11
24005 || INTEGRAL_OR_ENUMERATION_TYPE_P (type
));
24010 if (TREE_CODE (expression
) == TREE_LIST
)
24011 return any_value_dependent_elements_p (expression
);
24013 return value_dependent_expression_p (expression
);
24017 if (SIZEOF_EXPR_TYPE_P (expression
))
24018 return dependent_type_p (TREE_TYPE (TREE_OPERAND (expression
, 0)));
24022 /* A `sizeof' expression is value-dependent if the operand is
24023 type-dependent or is a pack expansion. */
24024 expression
= TREE_OPERAND (expression
, 0);
24025 if (PACK_EXPANSION_P (expression
))
24027 else if (TYPE_P (expression
))
24028 return dependent_type_p (expression
);
24029 return instantiation_dependent_uneval_expression_p (expression
);
24031 case AT_ENCODE_EXPR
:
24032 /* An 'encode' expression is value-dependent if the operand is
24034 expression
= TREE_OPERAND (expression
, 0);
24035 return dependent_type_p (expression
);
24037 case NOEXCEPT_EXPR
:
24038 expression
= TREE_OPERAND (expression
, 0);
24039 return instantiation_dependent_uneval_expression_p (expression
);
24042 /* All instantiation-dependent expressions should also be considered
24043 value-dependent. */
24044 return instantiation_dependent_scope_ref_p (expression
);
24046 case COMPONENT_REF
:
24047 return (value_dependent_expression_p (TREE_OPERAND (expression
, 0))
24048 || value_dependent_expression_p (TREE_OPERAND (expression
, 1)));
24050 case NONTYPE_ARGUMENT_PACK
:
24051 /* A NONTYPE_ARGUMENT_PACK is value-dependent if any packed argument
24052 is value-dependent. */
24054 tree values
= ARGUMENT_PACK_ARGS (expression
);
24055 int i
, len
= TREE_VEC_LENGTH (values
);
24057 for (i
= 0; i
< len
; ++i
)
24058 if (value_dependent_expression_p (TREE_VEC_ELT (values
, i
)))
24066 tree type2
= TRAIT_EXPR_TYPE2 (expression
);
24068 if (dependent_type_p (TRAIT_EXPR_TYPE1 (expression
)))
24074 if (TREE_CODE (type2
) != TREE_LIST
)
24075 return dependent_type_p (type2
);
24077 for (; type2
; type2
= TREE_CHAIN (type2
))
24078 if (dependent_type_p (TREE_VALUE (type2
)))
24085 return ((value_dependent_expression_p (TREE_OPERAND (expression
, 0)))
24086 || (value_dependent_expression_p (TREE_OPERAND (expression
, 2))));
24089 return ((value_dependent_expression_p (TREE_OPERAND (expression
, 0)))
24090 || (value_dependent_expression_p (TREE_OPERAND (expression
, 1))));
24094 tree op
= TREE_OPERAND (expression
, 0);
24095 return (value_dependent_expression_p (op
)
24096 || has_value_dependent_address (op
));
24099 case REQUIRES_EXPR
:
24100 /* Treat all requires-expressions as value-dependent so
24101 we don't try to fold them. */
24105 return dependent_type_p (TREE_OPERAND (expression
, 0));
24109 if (value_dependent_expression_p (CALL_EXPR_FN (expression
)))
24111 tree fn
= get_callee_fndecl (expression
);
24113 nargs
= call_expr_nargs (expression
);
24114 for (i
= 0; i
< nargs
; ++i
)
24116 tree op
= CALL_EXPR_ARG (expression
, i
);
24117 /* In a call to a constexpr member function, look through the
24118 implicit ADDR_EXPR on the object argument so that it doesn't
24119 cause the call to be considered value-dependent. We also
24120 look through it in potential_constant_expression. */
24121 if (i
== 0 && fn
&& DECL_DECLARED_CONSTEXPR_P (fn
)
24122 && DECL_NONSTATIC_MEMBER_FUNCTION_P (fn
)
24123 && TREE_CODE (op
) == ADDR_EXPR
)
24124 op
= TREE_OPERAND (op
, 0);
24125 if (value_dependent_expression_p (op
))
24131 case TEMPLATE_ID_EXPR
:
24132 return variable_concept_p (TREE_OPERAND (expression
, 0));
24138 if (dependent_type_p (TREE_TYPE (expression
)))
24140 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (expression
), ix
, val
)
24141 if (value_dependent_expression_p (val
))
24147 /* Treat a GNU statement expression as dependent to avoid crashing
24148 under instantiate_non_dependent_expr; it can't be constant. */
24152 /* A constant expression is value-dependent if any subexpression is
24153 value-dependent. */
24154 switch (TREE_CODE_CLASS (TREE_CODE (expression
)))
24156 case tcc_reference
:
24158 case tcc_comparison
:
24160 case tcc_expression
:
24163 int i
, len
= cp_tree_operand_length (expression
);
24165 for (i
= 0; i
< len
; i
++)
24167 tree t
= TREE_OPERAND (expression
, i
);
24169 /* In some cases, some of the operands may be missing.
24170 (For example, in the case of PREDECREMENT_EXPR, the
24171 amount to increment by may be missing.) That doesn't
24172 make the expression dependent. */
24173 if (t
&& value_dependent_expression_p (t
))
24184 /* The expression is not value-dependent. */
24188 /* Returns TRUE if the EXPRESSION is type-dependent, in the sense of
24189 [temp.dep.expr]. Note that an expression with no type is
24190 considered dependent. Other parts of the compiler arrange for an
24191 expression with type-dependent subexpressions to have no type, so
24192 this function doesn't have to be fully recursive. */
24195 type_dependent_expression_p (tree expression
)
24197 if (!processing_template_decl
)
24200 if (expression
== NULL_TREE
|| expression
== error_mark_node
)
24203 /* An unresolved name is always dependent. */
24204 if (identifier_p (expression
)
24205 || TREE_CODE (expression
) == USING_DECL
24206 || TREE_CODE (expression
) == WILDCARD_DECL
)
24209 /* A fold expression is type-dependent. */
24210 if (TREE_CODE (expression
) == UNARY_LEFT_FOLD_EXPR
24211 || TREE_CODE (expression
) == UNARY_RIGHT_FOLD_EXPR
24212 || TREE_CODE (expression
) == BINARY_LEFT_FOLD_EXPR
24213 || TREE_CODE (expression
) == BINARY_RIGHT_FOLD_EXPR
)
24216 /* Some expression forms are never type-dependent. */
24217 if (TREE_CODE (expression
) == PSEUDO_DTOR_EXPR
24218 || TREE_CODE (expression
) == SIZEOF_EXPR
24219 || TREE_CODE (expression
) == ALIGNOF_EXPR
24220 || TREE_CODE (expression
) == AT_ENCODE_EXPR
24221 || TREE_CODE (expression
) == NOEXCEPT_EXPR
24222 || TREE_CODE (expression
) == TRAIT_EXPR
24223 || TREE_CODE (expression
) == TYPEID_EXPR
24224 || TREE_CODE (expression
) == DELETE_EXPR
24225 || TREE_CODE (expression
) == VEC_DELETE_EXPR
24226 || TREE_CODE (expression
) == THROW_EXPR
24227 || TREE_CODE (expression
) == REQUIRES_EXPR
)
24230 /* The types of these expressions depends only on the type to which
24231 the cast occurs. */
24232 if (TREE_CODE (expression
) == DYNAMIC_CAST_EXPR
24233 || TREE_CODE (expression
) == STATIC_CAST_EXPR
24234 || TREE_CODE (expression
) == CONST_CAST_EXPR
24235 || TREE_CODE (expression
) == REINTERPRET_CAST_EXPR
24236 || TREE_CODE (expression
) == IMPLICIT_CONV_EXPR
24237 || TREE_CODE (expression
) == CAST_EXPR
)
24238 return dependent_type_p (TREE_TYPE (expression
));
24240 /* The types of these expressions depends only on the type created
24241 by the expression. */
24242 if (TREE_CODE (expression
) == NEW_EXPR
24243 || TREE_CODE (expression
) == VEC_NEW_EXPR
)
24245 /* For NEW_EXPR tree nodes created inside a template, either
24246 the object type itself or a TREE_LIST may appear as the
24248 tree type
= TREE_OPERAND (expression
, 1);
24249 if (TREE_CODE (type
) == TREE_LIST
)
24250 /* This is an array type. We need to check array dimensions
24252 return dependent_type_p (TREE_VALUE (TREE_PURPOSE (type
)))
24253 || value_dependent_expression_p
24254 (TREE_OPERAND (TREE_VALUE (type
), 1));
24256 return dependent_type_p (type
);
24259 if (TREE_CODE (expression
) == SCOPE_REF
)
24261 tree scope
= TREE_OPERAND (expression
, 0);
24262 tree name
= TREE_OPERAND (expression
, 1);
24264 /* 14.6.2.2 [temp.dep.expr]: An id-expression is type-dependent if it
24265 contains an identifier associated by name lookup with one or more
24266 declarations declared with a dependent type, or...a
24267 nested-name-specifier or qualified-id that names a member of an
24268 unknown specialization. */
24269 return (type_dependent_expression_p (name
)
24270 || dependent_scope_p (scope
));
24273 if (TREE_CODE (expression
) == TEMPLATE_DECL
24274 && !DECL_TEMPLATE_TEMPLATE_PARM_P (expression
))
24275 return uses_outer_template_parms (expression
);
24277 if (TREE_CODE (expression
) == STMT_EXPR
)
24278 expression
= stmt_expr_value_expr (expression
);
24280 if (BRACE_ENCLOSED_INITIALIZER_P (expression
))
24285 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (expression
), i
, elt
)
24287 if (type_dependent_expression_p (elt
))
24293 /* A static data member of the current instantiation with incomplete
24294 array type is type-dependent, as the definition and specializations
24295 can have different bounds. */
24296 if (VAR_P (expression
)
24297 && DECL_CLASS_SCOPE_P (expression
)
24298 && dependent_type_p (DECL_CONTEXT (expression
))
24299 && VAR_HAD_UNKNOWN_BOUND (expression
))
24302 /* An array of unknown bound depending on a variadic parameter, eg:
24304 template<typename... Args>
24305 void foo (Args... args)
24307 int arr[] = { args... };
24310 template<int... vals>
24313 int arr[] = { vals... };
24316 If the array has no length and has an initializer, it must be that
24317 we couldn't determine its length in cp_complete_array_type because
24318 it is dependent. */
24319 if (VAR_P (expression
)
24320 && TREE_TYPE (expression
) != NULL_TREE
24321 && TREE_CODE (TREE_TYPE (expression
)) == ARRAY_TYPE
24322 && !TYPE_DOMAIN (TREE_TYPE (expression
))
24323 && DECL_INITIAL (expression
))
24326 /* A function or variable template-id is type-dependent if it has any
24327 dependent template arguments. */
24328 if (VAR_OR_FUNCTION_DECL_P (expression
)
24329 && DECL_LANG_SPECIFIC (expression
)
24330 && DECL_TEMPLATE_INFO (expression
))
24332 /* Consider the innermost template arguments, since those are the ones
24333 that come from the template-id; the template arguments for the
24334 enclosing class do not make it type-dependent unless they are used in
24335 the type of the decl. */
24336 if (PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (expression
))
24337 && (any_dependent_template_arguments_p
24338 (INNERMOST_TEMPLATE_ARGS (DECL_TI_ARGS (expression
)))))
24342 /* Otherwise, if the function decl isn't from a dependent scope, it can't be
24343 type-dependent. Checking this is important for functions with auto return
24344 type, which looks like a dependent type. */
24345 if (TREE_CODE (expression
) == FUNCTION_DECL
24346 && !(DECL_CLASS_SCOPE_P (expression
)
24347 && dependent_type_p (DECL_CONTEXT (expression
)))
24348 && !(DECL_FRIEND_P (expression
)
24349 && (!DECL_FRIEND_CONTEXT (expression
)
24350 || dependent_type_p (DECL_FRIEND_CONTEXT (expression
))))
24351 && !DECL_LOCAL_FUNCTION_P (expression
))
24353 gcc_assert (!dependent_type_p (TREE_TYPE (expression
))
24354 || undeduced_auto_decl (expression
));
24358 /* Always dependent, on the number of arguments if nothing else. */
24359 if (TREE_CODE (expression
) == EXPR_PACK_EXPANSION
)
24362 if (TREE_TYPE (expression
) == unknown_type_node
)
24364 if (TREE_CODE (expression
) == ADDR_EXPR
)
24365 return type_dependent_expression_p (TREE_OPERAND (expression
, 0));
24366 if (TREE_CODE (expression
) == COMPONENT_REF
24367 || TREE_CODE (expression
) == OFFSET_REF
)
24369 if (type_dependent_expression_p (TREE_OPERAND (expression
, 0)))
24371 expression
= TREE_OPERAND (expression
, 1);
24372 if (identifier_p (expression
))
24375 /* SCOPE_REF with non-null TREE_TYPE is always non-dependent. */
24376 if (TREE_CODE (expression
) == SCOPE_REF
)
24379 if (BASELINK_P (expression
))
24381 if (BASELINK_OPTYPE (expression
)
24382 && dependent_type_p (BASELINK_OPTYPE (expression
)))
24384 expression
= BASELINK_FUNCTIONS (expression
);
24387 if (TREE_CODE (expression
) == TEMPLATE_ID_EXPR
)
24389 if (any_dependent_template_arguments_p
24390 (TREE_OPERAND (expression
, 1)))
24392 expression
= TREE_OPERAND (expression
, 0);
24393 if (identifier_p (expression
))
24397 gcc_assert (TREE_CODE (expression
) == OVERLOAD
24398 || TREE_CODE (expression
) == FUNCTION_DECL
);
24400 for (lkp_iterator
iter (expression
); iter
; ++iter
)
24401 if (type_dependent_expression_p (*iter
))
24407 gcc_assert (TREE_CODE (expression
) != TYPE_DECL
);
24409 /* Dependent type attributes might not have made it from the decl to
24411 if (DECL_P (expression
)
24412 && any_dependent_type_attributes_p (DECL_ATTRIBUTES (expression
)))
24415 return (dependent_type_p (TREE_TYPE (expression
)));
24418 /* [temp.dep.expr]/5: A class member access expression (5.2.5) is
24419 type-dependent if the expression refers to a member of the current
24420 instantiation and the type of the referenced member is dependent, or the
24421 class member access expression refers to a member of an unknown
24424 This function returns true if the OBJECT in such a class member access
24425 expression is of an unknown specialization. */
24428 type_dependent_object_expression_p (tree object
)
24430 /* An IDENTIFIER_NODE can sometimes have a TREE_TYPE, but it's still
24432 if (TREE_CODE (object
) == IDENTIFIER_NODE
)
24434 tree scope
= TREE_TYPE (object
);
24435 return (!scope
|| dependent_scope_p (scope
));
24438 /* walk_tree callback function for instantiation_dependent_expression_p,
24439 below. Returns non-zero if a dependent subexpression is found. */
24442 instantiation_dependent_r (tree
*tp
, int *walk_subtrees
,
24447 /* We don't have to worry about decltype currently because decltype
24448 of an instantiation-dependent expr is a dependent type. This
24449 might change depending on the resolution of DR 1172. */
24450 *walk_subtrees
= false;
24453 enum tree_code code
= TREE_CODE (*tp
);
24456 /* Don't treat an argument list as dependent just because it has no
24462 case TEMPLATE_PARM_INDEX
:
24465 /* Handle expressions with type operands. */
24469 case AT_ENCODE_EXPR
:
24471 tree op
= TREE_OPERAND (*tp
, 0);
24472 if (code
== SIZEOF_EXPR
&& SIZEOF_EXPR_TYPE_P (*tp
))
24473 op
= TREE_TYPE (op
);
24476 if (dependent_type_p (op
))
24480 *walk_subtrees
= false;
24487 case COMPONENT_REF
:
24488 if (identifier_p (TREE_OPERAND (*tp
, 1)))
24489 /* In a template, finish_class_member_access_expr creates a
24490 COMPONENT_REF with an IDENTIFIER_NODE for op1 even if it isn't
24491 type-dependent, so that we can check access control at
24492 instantiation time (PR 42277). See also Core issue 1273. */
24497 if (instantiation_dependent_scope_ref_p (*tp
))
24502 /* Treat statement-expressions as dependent. */
24506 /* Treat requires-expressions as dependent. */
24507 case REQUIRES_EXPR
:
24511 /* Treat calls to function concepts as dependent. */
24512 if (function_concept_check_p (*tp
))
24516 case TEMPLATE_ID_EXPR
:
24517 /* And variable concepts. */
24518 if (variable_concept_p (TREE_OPERAND (*tp
, 0)))
24526 if (type_dependent_expression_p (*tp
))
24532 /* Returns TRUE if the EXPRESSION is instantiation-dependent, in the
24533 sense defined by the ABI:
24535 "An expression is instantiation-dependent if it is type-dependent
24536 or value-dependent, or it has a subexpression that is type-dependent
24537 or value-dependent."
24539 Except don't actually check value-dependence for unevaluated expressions,
24540 because in sizeof(i) we don't care about the value of i. Checking
24541 type-dependence will in turn check value-dependence of array bounds/template
24542 arguments as needed. */
24545 instantiation_dependent_uneval_expression_p (tree expression
)
24549 if (!processing_template_decl
)
24552 if (expression
== error_mark_node
)
24555 result
= cp_walk_tree_without_duplicates (&expression
,
24556 instantiation_dependent_r
, NULL
);
24557 return result
!= NULL_TREE
;
24560 /* As above, but also check value-dependence of the expression as a whole. */
24563 instantiation_dependent_expression_p (tree expression
)
24565 return (instantiation_dependent_uneval_expression_p (expression
)
24566 || value_dependent_expression_p (expression
));
24569 /* Like type_dependent_expression_p, but it also works while not processing
24570 a template definition, i.e. during substitution or mangling. */
24573 type_dependent_expression_p_push (tree expr
)
24576 ++processing_template_decl
;
24577 b
= type_dependent_expression_p (expr
);
24578 --processing_template_decl
;
24582 /* Returns TRUE if ARGS contains a type-dependent expression. */
24585 any_type_dependent_arguments_p (const vec
<tree
, va_gc
> *args
)
24590 FOR_EACH_VEC_SAFE_ELT (args
, i
, arg
)
24592 if (type_dependent_expression_p (arg
))
24598 /* Returns TRUE if LIST (a TREE_LIST whose TREE_VALUEs are
24599 expressions) contains any type-dependent expressions. */
24602 any_type_dependent_elements_p (const_tree list
)
24604 for (; list
; list
= TREE_CHAIN (list
))
24605 if (type_dependent_expression_p (TREE_VALUE (list
)))
24611 /* Returns TRUE if LIST (a TREE_LIST whose TREE_VALUEs are
24612 expressions) contains any value-dependent expressions. */
24615 any_value_dependent_elements_p (const_tree list
)
24617 for (; list
; list
= TREE_CHAIN (list
))
24618 if (value_dependent_expression_p (TREE_VALUE (list
)))
24624 /* Returns TRUE if the ARG (a template argument) is dependent. */
24627 dependent_template_arg_p (tree arg
)
24629 if (!processing_template_decl
)
24632 /* Assume a template argument that was wrongly written by the user
24633 is dependent. This is consistent with what
24634 any_dependent_template_arguments_p [that calls this function]
24636 if (!arg
|| arg
== error_mark_node
)
24639 if (TREE_CODE (arg
) == ARGUMENT_PACK_SELECT
)
24640 arg
= ARGUMENT_PACK_SELECT_ARG (arg
);
24642 if (TREE_CODE (arg
) == TEMPLATE_TEMPLATE_PARM
)
24644 if (TREE_CODE (arg
) == TEMPLATE_DECL
)
24646 if (DECL_TEMPLATE_PARM_P (arg
))
24648 /* A member template of a dependent class is not necessarily
24649 type-dependent, but it is a dependent template argument because it
24650 will be a member of an unknown specialization to that template. */
24651 tree scope
= CP_DECL_CONTEXT (arg
);
24652 return TYPE_P (scope
) && dependent_type_p (scope
);
24654 else if (ARGUMENT_PACK_P (arg
))
24656 tree args
= ARGUMENT_PACK_ARGS (arg
);
24657 int i
, len
= TREE_VEC_LENGTH (args
);
24658 for (i
= 0; i
< len
; ++i
)
24660 if (dependent_template_arg_p (TREE_VEC_ELT (args
, i
)))
24666 else if (TYPE_P (arg
))
24667 return dependent_type_p (arg
);
24669 return (type_dependent_expression_p (arg
)
24670 || value_dependent_expression_p (arg
));
24673 /* Returns true if ARGS (a collection of template arguments) contains
24674 any types that require structural equality testing. */
24677 any_template_arguments_need_structural_equality_p (tree args
)
24684 if (args
== error_mark_node
)
24687 for (i
= 0; i
< TMPL_ARGS_DEPTH (args
); ++i
)
24689 tree level
= TMPL_ARGS_LEVEL (args
, i
+ 1);
24690 for (j
= 0; j
< TREE_VEC_LENGTH (level
); ++j
)
24692 tree arg
= TREE_VEC_ELT (level
, j
);
24693 tree packed_args
= NULL_TREE
;
24696 if (ARGUMENT_PACK_P (arg
))
24698 /* Look inside the argument pack. */
24699 packed_args
= ARGUMENT_PACK_ARGS (arg
);
24700 len
= TREE_VEC_LENGTH (packed_args
);
24703 for (k
= 0; k
< len
; ++k
)
24706 arg
= TREE_VEC_ELT (packed_args
, k
);
24708 if (error_operand_p (arg
))
24710 else if (TREE_CODE (arg
) == TEMPLATE_DECL
)
24712 else if (TYPE_P (arg
) && TYPE_STRUCTURAL_EQUALITY_P (arg
))
24714 else if (!TYPE_P (arg
) && TREE_TYPE (arg
)
24715 && TYPE_STRUCTURAL_EQUALITY_P (TREE_TYPE (arg
)))
24724 /* Returns true if ARGS (a collection of template arguments) contains
24725 any dependent arguments. */
24728 any_dependent_template_arguments_p (const_tree args
)
24735 if (args
== error_mark_node
)
24738 for (i
= 0; i
< TMPL_ARGS_DEPTH (args
); ++i
)
24740 const_tree level
= TMPL_ARGS_LEVEL (args
, i
+ 1);
24741 for (j
= 0; j
< TREE_VEC_LENGTH (level
); ++j
)
24742 if (dependent_template_arg_p (TREE_VEC_ELT (level
, j
)))
24749 /* Returns TRUE if the template TMPL is type-dependent. */
24752 dependent_template_p (tree tmpl
)
24754 if (TREE_CODE (tmpl
) == OVERLOAD
)
24756 for (lkp_iterator
iter (tmpl
); iter
; ++iter
)
24757 if (dependent_template_p (*iter
))
24762 /* Template template parameters are dependent. */
24763 if (DECL_TEMPLATE_TEMPLATE_PARM_P (tmpl
)
24764 || TREE_CODE (tmpl
) == TEMPLATE_TEMPLATE_PARM
)
24766 /* So are names that have not been looked up. */
24767 if (TREE_CODE (tmpl
) == SCOPE_REF
|| identifier_p (tmpl
))
24772 /* Returns TRUE if the specialization TMPL<ARGS> is dependent. */
24775 dependent_template_id_p (tree tmpl
, tree args
)
24777 return (dependent_template_p (tmpl
)
24778 || any_dependent_template_arguments_p (args
));
24781 /* Returns TRUE if OMP_FOR with DECLV, INITV, CONDV and INCRV vectors
24785 dependent_omp_for_p (tree declv
, tree initv
, tree condv
, tree incrv
)
24789 if (!processing_template_decl
)
24792 for (i
= 0; i
< TREE_VEC_LENGTH (declv
); i
++)
24794 tree decl
= TREE_VEC_ELT (declv
, i
);
24795 tree init
= TREE_VEC_ELT (initv
, i
);
24796 tree cond
= TREE_VEC_ELT (condv
, i
);
24797 tree incr
= TREE_VEC_ELT (incrv
, i
);
24799 if (type_dependent_expression_p (decl
)
24800 || TREE_CODE (decl
) == SCOPE_REF
)
24803 if (init
&& type_dependent_expression_p (init
))
24806 if (type_dependent_expression_p (cond
))
24809 if (COMPARISON_CLASS_P (cond
)
24810 && (type_dependent_expression_p (TREE_OPERAND (cond
, 0))
24811 || type_dependent_expression_p (TREE_OPERAND (cond
, 1))))
24814 if (TREE_CODE (incr
) == MODOP_EXPR
)
24816 if (type_dependent_expression_p (TREE_OPERAND (incr
, 0))
24817 || type_dependent_expression_p (TREE_OPERAND (incr
, 2)))
24820 else if (type_dependent_expression_p (incr
))
24822 else if (TREE_CODE (incr
) == MODIFY_EXPR
)
24824 if (type_dependent_expression_p (TREE_OPERAND (incr
, 0)))
24826 else if (BINARY_CLASS_P (TREE_OPERAND (incr
, 1)))
24828 tree t
= TREE_OPERAND (incr
, 1);
24829 if (type_dependent_expression_p (TREE_OPERAND (t
, 0))
24830 || type_dependent_expression_p (TREE_OPERAND (t
, 1)))
24839 /* TYPE is a TYPENAME_TYPE. Returns the ordinary TYPE to which the
24840 TYPENAME_TYPE corresponds. Returns the original TYPENAME_TYPE if
24841 no such TYPE can be found. Note that this function peers inside
24842 uninstantiated templates and therefore should be used only in
24843 extremely limited situations. ONLY_CURRENT_P restricts this
24844 peering to the currently open classes hierarchy (which is required
24845 when comparing types). */
24848 resolve_typename_type (tree type
, bool only_current_p
)
24857 gcc_assert (TREE_CODE (type
) == TYPENAME_TYPE
);
24859 scope
= TYPE_CONTEXT (type
);
24860 /* Usually the non-qualified identifier of a TYPENAME_TYPE is
24861 TYPE_IDENTIFIER (type). But when 'type' is a typedef variant of
24862 a TYPENAME_TYPE node, then TYPE_NAME (type) is set to the TYPE_DECL representing
24863 the typedef. In that case TYPE_IDENTIFIER (type) is not the non-qualified
24864 identifier of the TYPENAME_TYPE anymore.
24865 So by getting the TYPE_IDENTIFIER of the _main declaration_ of the
24866 TYPENAME_TYPE instead, we avoid messing up with a possible
24867 typedef variant case. */
24868 name
= TYPE_IDENTIFIER (TYPE_MAIN_VARIANT (type
));
24870 /* If the SCOPE is itself a TYPENAME_TYPE, then we need to resolve
24871 it first before we can figure out what NAME refers to. */
24872 if (TREE_CODE (scope
) == TYPENAME_TYPE
)
24874 if (TYPENAME_IS_RESOLVING_P (scope
))
24875 /* Given a class template A with a dependent base with nested type C,
24876 typedef typename A::C::C C will land us here, as trying to resolve
24877 the initial A::C leads to the local C typedef, which leads back to
24878 A::C::C. So we break the recursion now. */
24881 scope
= resolve_typename_type (scope
, only_current_p
);
24883 /* If we don't know what SCOPE refers to, then we cannot resolve the
24885 if (!CLASS_TYPE_P (scope
))
24887 /* If this is a typedef, we don't want to look inside (c++/11987). */
24888 if (typedef_variant_p (type
))
24890 /* If SCOPE isn't the template itself, it will not have a valid
24891 TYPE_FIELDS list. */
24892 if (same_type_p (scope
, CLASSTYPE_PRIMARY_TEMPLATE_TYPE (scope
)))
24893 /* scope is either the template itself or a compatible instantiation
24894 like X<T>, so look up the name in the original template. */
24895 scope
= CLASSTYPE_PRIMARY_TEMPLATE_TYPE (scope
);
24896 /* We shouldn't have built a TYPENAME_TYPE with a non-dependent scope. */
24897 gcc_checking_assert (uses_template_parms (scope
));
24898 /* If scope has no fields, it can't be a current instantiation. Check this
24899 before currently_open_class to avoid infinite recursion (71515). */
24900 if (!TYPE_FIELDS (scope
))
24902 /* If the SCOPE is not the current instantiation, there's no reason
24903 to look inside it. */
24904 if (only_current_p
&& !currently_open_class (scope
))
24906 /* Enter the SCOPE so that name lookup will be resolved as if we
24907 were in the class definition. In particular, SCOPE will no
24908 longer be considered a dependent type. */
24909 pushed_scope
= push_scope (scope
);
24910 /* Look up the declaration. */
24911 decl
= lookup_member (scope
, name
, /*protect=*/0, /*want_type=*/true,
24912 tf_warning_or_error
);
24914 result
= NULL_TREE
;
24916 /* For a TYPENAME_TYPE like "typename X::template Y<T>", we want to
24917 find a TEMPLATE_DECL. Otherwise, we want to find a TYPE_DECL. */
24918 tree fullname
= TYPENAME_TYPE_FULLNAME (type
);
24921 else if (identifier_p (fullname
)
24922 && TREE_CODE (decl
) == TYPE_DECL
)
24924 result
= TREE_TYPE (decl
);
24925 if (result
== error_mark_node
)
24926 result
= NULL_TREE
;
24928 else if (TREE_CODE (fullname
) == TEMPLATE_ID_EXPR
24929 && DECL_CLASS_TEMPLATE_P (decl
))
24931 /* Obtain the template and the arguments. */
24932 tree tmpl
= TREE_OPERAND (fullname
, 0);
24933 if (TREE_CODE (tmpl
) == IDENTIFIER_NODE
)
24935 /* We get here with a plain identifier because a previous tentative
24936 parse of the nested-name-specifier as part of a ptr-operator saw
24937 ::template X<A>. The use of ::template is necessary in a
24938 ptr-operator, but wrong in a declarator-id.
24940 [temp.names]: In a qualified-id of a declarator-id, the keyword
24941 template shall not appear at the top level. */
24942 pedwarn (EXPR_LOC_OR_LOC (fullname
, input_location
), OPT_Wpedantic
,
24943 "keyword %<template%> not allowed in declarator-id");
24946 tree args
= TREE_OPERAND (fullname
, 1);
24947 /* Instantiate the template. */
24948 result
= lookup_template_class (tmpl
, args
, NULL_TREE
, NULL_TREE
,
24949 /*entering_scope=*/true,
24950 tf_error
| tf_user
);
24951 if (result
== error_mark_node
)
24952 result
= NULL_TREE
;
24955 /* Leave the SCOPE. */
24957 pop_scope (pushed_scope
);
24959 /* If we failed to resolve it, return the original typename. */
24963 /* If lookup found a typename type, resolve that too. */
24964 if (TREE_CODE (result
) == TYPENAME_TYPE
&& !TYPENAME_IS_RESOLVING_P (result
))
24966 /* Ill-formed programs can cause infinite recursion here, so we
24967 must catch that. */
24968 TYPENAME_IS_RESOLVING_P (result
) = 1;
24969 result
= resolve_typename_type (result
, only_current_p
);
24970 TYPENAME_IS_RESOLVING_P (result
) = 0;
24973 /* Qualify the resulting type. */
24974 quals
= cp_type_quals (type
);
24976 result
= cp_build_qualified_type (result
, cp_type_quals (result
) | quals
);
24981 /* EXPR is an expression which is not type-dependent. Return a proxy
24982 for EXPR that can be used to compute the types of larger
24983 expressions containing EXPR. */
24986 build_non_dependent_expr (tree expr
)
24990 /* When checking, try to get a constant value for all non-dependent
24991 expressions in order to expose bugs in *_dependent_expression_p
24992 and constexpr. This can affect code generation, see PR70704, so
24993 only do this for -fchecking=2. */
24994 if (flag_checking
> 1
24995 && cxx_dialect
>= cxx11
24996 /* Don't do this during nsdmi parsing as it can lead to
24997 unexpected recursive instantiations. */
24998 && !parsing_nsdmi ()
24999 /* Don't do this during concept expansion either and for
25000 the same reason. */
25001 && !expanding_concept ())
25002 fold_non_dependent_expr (expr
);
25004 /* Preserve OVERLOADs; the functions must be available to resolve
25007 if (TREE_CODE (inner_expr
) == STMT_EXPR
)
25008 inner_expr
= stmt_expr_value_expr (inner_expr
);
25009 if (TREE_CODE (inner_expr
) == ADDR_EXPR
)
25010 inner_expr
= TREE_OPERAND (inner_expr
, 0);
25011 if (TREE_CODE (inner_expr
) == COMPONENT_REF
)
25012 inner_expr
= TREE_OPERAND (inner_expr
, 1);
25013 if (is_overloaded_fn (inner_expr
)
25014 || TREE_CODE (inner_expr
) == OFFSET_REF
)
25016 /* There is no need to return a proxy for a variable. */
25019 /* Preserve string constants; conversions from string constants to
25020 "char *" are allowed, even though normally a "const char *"
25021 cannot be used to initialize a "char *". */
25022 if (TREE_CODE (expr
) == STRING_CST
)
25024 /* Preserve void and arithmetic constants, as an optimization -- there is no
25025 reason to create a new node. */
25026 if (TREE_CODE (expr
) == VOID_CST
25027 || TREE_CODE (expr
) == INTEGER_CST
25028 || TREE_CODE (expr
) == REAL_CST
)
25030 /* Preserve THROW_EXPRs -- all throw-expressions have type "void".
25031 There is at least one place where we want to know that a
25032 particular expression is a throw-expression: when checking a ?:
25033 expression, there are special rules if the second or third
25034 argument is a throw-expression. */
25035 if (TREE_CODE (expr
) == THROW_EXPR
)
25038 /* Don't wrap an initializer list, we need to be able to look inside. */
25039 if (BRACE_ENCLOSED_INITIALIZER_P (expr
))
25042 /* Don't wrap a dummy object, we need to be able to test for it. */
25043 if (is_dummy_object (expr
))
25046 if (TREE_CODE (expr
) == COND_EXPR
)
25047 return build3 (COND_EXPR
,
25049 TREE_OPERAND (expr
, 0),
25050 (TREE_OPERAND (expr
, 1)
25051 ? build_non_dependent_expr (TREE_OPERAND (expr
, 1))
25052 : build_non_dependent_expr (TREE_OPERAND (expr
, 0))),
25053 build_non_dependent_expr (TREE_OPERAND (expr
, 2)));
25054 if (TREE_CODE (expr
) == COMPOUND_EXPR
25055 && !COMPOUND_EXPR_OVERLOADED (expr
))
25056 return build2 (COMPOUND_EXPR
,
25058 TREE_OPERAND (expr
, 0),
25059 build_non_dependent_expr (TREE_OPERAND (expr
, 1)));
25061 /* If the type is unknown, it can't really be non-dependent */
25062 gcc_assert (TREE_TYPE (expr
) != unknown_type_node
);
25064 /* Otherwise, build a NON_DEPENDENT_EXPR. */
25065 return build1 (NON_DEPENDENT_EXPR
, TREE_TYPE (expr
), expr
);
25068 /* ARGS is a vector of expressions as arguments to a function call.
25069 Replace the arguments with equivalent non-dependent expressions.
25070 This modifies ARGS in place. */
25073 make_args_non_dependent (vec
<tree
, va_gc
> *args
)
25078 FOR_EACH_VEC_SAFE_ELT (args
, ix
, arg
)
25080 tree newarg
= build_non_dependent_expr (arg
);
25082 (*args
)[ix
] = newarg
;
25086 /* Returns a type which represents 'auto' or 'decltype(auto)'. We use a
25087 TEMPLATE_TYPE_PARM with a level one deeper than the actual template
25088 parms. If set_canonical is true, we set TYPE_CANONICAL on it. */
25091 make_auto_1 (tree name
, bool set_canonical
)
25093 tree au
= cxx_make_type (TEMPLATE_TYPE_PARM
);
25094 TYPE_NAME (au
) = build_decl (input_location
,
25095 TYPE_DECL
, name
, au
);
25096 TYPE_STUB_DECL (au
) = TYPE_NAME (au
);
25097 TEMPLATE_TYPE_PARM_INDEX (au
) = build_template_parm_index
25098 (0, processing_template_decl
+ 1, processing_template_decl
+ 1,
25099 TYPE_NAME (au
), NULL_TREE
);
25101 TYPE_CANONICAL (au
) = canonical_type_parameter (au
);
25102 DECL_ARTIFICIAL (TYPE_NAME (au
)) = 1;
25103 SET_DECL_TEMPLATE_PARM_P (TYPE_NAME (au
));
25109 make_decltype_auto (void)
25111 return make_auto_1 (decltype_auto_identifier
, true);
25117 return make_auto_1 (auto_identifier
, true);
25120 /* Return a C++17 deduction placeholder for class template TMPL. */
25123 make_template_placeholder (tree tmpl
)
25125 tree t
= make_auto_1 (DECL_NAME (tmpl
), true);
25126 CLASS_PLACEHOLDER_TEMPLATE (t
) = tmpl
;
25130 /* True iff T is a C++17 class template deduction placeholder. */
25133 template_placeholder_p (tree t
)
25135 return is_auto (t
) && CLASS_PLACEHOLDER_TEMPLATE (t
);
25138 /* Make a "constrained auto" type-specifier. This is an
25139 auto type with constraints that must be associated after
25140 deduction. The constraint is formed from the given
25141 CONC and its optional sequence of arguments, which are
25142 non-null if written as partial-concept-id. */
25145 make_constrained_auto (tree con
, tree args
)
25147 tree type
= make_auto_1 (auto_identifier
, false);
25149 /* Build the constraint. */
25150 tree tmpl
= DECL_TI_TEMPLATE (con
);
25151 tree expr
= VAR_P (con
) ? tmpl
: ovl_make (tmpl
);
25152 expr
= build_concept_check (expr
, type
, args
);
25154 tree constr
= normalize_expression (expr
);
25155 PLACEHOLDER_TYPE_CONSTRAINTS (type
) = constr
;
25157 /* Our canonical type depends on the constraint. */
25158 TYPE_CANONICAL (type
) = canonical_type_parameter (type
);
25160 /* Attach the constraint to the type declaration. */
25161 tree decl
= TYPE_NAME (type
);
25165 /* Given type ARG, return std::initializer_list<ARG>. */
25170 tree std_init_list
= get_namespace_binding (std_node
, init_list_identifier
);
25172 if (!std_init_list
|| !DECL_CLASS_TEMPLATE_P (std_init_list
))
25174 gcc_rich_location
richloc (input_location
);
25175 maybe_add_include_fixit (&richloc
, "<initializer_list>");
25176 error_at (&richloc
,
25177 "deducing from brace-enclosed initializer list"
25178 " requires %<#include <initializer_list>%>");
25180 return error_mark_node
;
25182 tree argvec
= make_tree_vec (1);
25183 TREE_VEC_ELT (argvec
, 0) = arg
;
25185 return lookup_template_class (std_init_list
, argvec
, NULL_TREE
,
25186 NULL_TREE
, 0, tf_warning_or_error
);
25189 /* Replace auto in TYPE with std::initializer_list<auto>. */
25192 listify_autos (tree type
, tree auto_node
)
25194 tree init_auto
= listify (auto_node
);
25195 tree argvec
= make_tree_vec (1);
25196 TREE_VEC_ELT (argvec
, 0) = init_auto
;
25197 if (processing_template_decl
)
25198 argvec
= add_to_template_args (current_template_args (), argvec
);
25199 return tsubst (type
, argvec
, tf_warning_or_error
, NULL_TREE
);
25202 /* Hash traits for hashing possibly constrained 'auto'
25203 TEMPLATE_TYPE_PARMs for use by do_auto_deduction. */
25205 struct auto_hash
: default_hash_traits
<tree
>
25207 static inline hashval_t
hash (tree
);
25208 static inline bool equal (tree
, tree
);
25211 /* Hash the 'auto' T. */
25214 auto_hash::hash (tree t
)
25216 if (tree c
= PLACEHOLDER_TYPE_CONSTRAINTS (t
))
25217 /* Matching constrained-type-specifiers denote the same template
25218 parameter, so hash the constraint. */
25219 return hash_placeholder_constraint (c
);
25221 /* But unconstrained autos are all separate, so just hash the pointer. */
25222 return iterative_hash_object (t
, 0);
25225 /* Compare two 'auto's. */
25228 auto_hash::equal (tree t1
, tree t2
)
25233 tree c1
= PLACEHOLDER_TYPE_CONSTRAINTS (t1
);
25234 tree c2
= PLACEHOLDER_TYPE_CONSTRAINTS (t2
);
25236 /* Two unconstrained autos are distinct. */
25240 return equivalent_placeholder_constraints (c1
, c2
);
25243 /* for_each_template_parm callback for extract_autos: if t is a (possibly
25244 constrained) auto, add it to the vector. */
25247 extract_autos_r (tree t
, void *data
)
25249 hash_table
<auto_hash
> &hash
= *(hash_table
<auto_hash
>*)data
;
25252 /* All the autos were built with index 0; fix that up now. */
25253 tree
*p
= hash
.find_slot (t
, INSERT
);
25256 /* If this is a repeated constrained-type-specifier, use the index we
25258 idx
= TEMPLATE_PARM_IDX (TEMPLATE_TYPE_PARM_INDEX (*p
));
25261 /* Otherwise this is new, so use the current count. */
25263 idx
= hash
.elements () - 1;
25265 TEMPLATE_PARM_IDX (TEMPLATE_TYPE_PARM_INDEX (t
)) = idx
;
25268 /* Always keep walking. */
25272 /* Return a TREE_VEC of the 'auto's used in type under the Concepts TS, which
25273 says they can appear anywhere in the type. */
25276 extract_autos (tree type
)
25278 hash_set
<tree
> visited
;
25279 hash_table
<auto_hash
> hash (2);
25281 for_each_template_parm (type
, extract_autos_r
, &hash
, &visited
, true);
25283 tree tree_vec
= make_tree_vec (hash
.elements());
25284 for (hash_table
<auto_hash
>::iterator iter
= hash
.begin();
25285 iter
!= hash
.end(); ++iter
)
25288 unsigned i
= TEMPLATE_PARM_IDX (TEMPLATE_TYPE_PARM_INDEX (elt
));
25289 TREE_VEC_ELT (tree_vec
, i
)
25290 = build_tree_list (NULL_TREE
, TYPE_NAME (elt
));
25296 /* The stem for deduction guide names. */
25297 const char *const dguide_base
= "__dguide_";
25299 /* Return the name for a deduction guide for class template TMPL. */
25302 dguide_name (tree tmpl
)
25304 tree type
= (TYPE_P (tmpl
) ? tmpl
: TREE_TYPE (tmpl
));
25305 tree tname
= TYPE_IDENTIFIER (type
);
25306 char *buf
= (char *) alloca (1 + strlen (dguide_base
)
25307 + IDENTIFIER_LENGTH (tname
));
25308 memcpy (buf
, dguide_base
, strlen (dguide_base
));
25309 memcpy (buf
+ strlen (dguide_base
), IDENTIFIER_POINTER (tname
),
25310 IDENTIFIER_LENGTH (tname
) + 1);
25311 tree dname
= get_identifier (buf
);
25312 TREE_TYPE (dname
) = type
;
25316 /* True if NAME is the name of a deduction guide. */
25319 dguide_name_p (tree name
)
25321 return (TREE_TYPE (name
)
25322 && !strncmp (IDENTIFIER_POINTER (name
), dguide_base
,
25323 strlen (dguide_base
)));
25326 /* True if FN is a deduction guide. */
25329 deduction_guide_p (const_tree fn
)
25332 if (tree name
= DECL_NAME (fn
))
25333 return dguide_name_p (name
);
25337 /* True if FN is the copy deduction guide, i.e. A(A)->A. */
25340 copy_guide_p (const_tree fn
)
25342 gcc_assert (deduction_guide_p (fn
));
25343 if (!DECL_ARTIFICIAL (fn
))
25345 tree parms
= FUNCTION_FIRST_USER_PARMTYPE (DECL_TI_TEMPLATE (fn
));
25346 return (TREE_CHAIN (parms
) == void_list_node
25347 && same_type_p (TREE_VALUE (parms
), TREE_TYPE (DECL_NAME (fn
))));
25350 /* True if FN is a guide generated from a constructor template. */
25353 template_guide_p (const_tree fn
)
25355 gcc_assert (deduction_guide_p (fn
));
25356 if (!DECL_ARTIFICIAL (fn
))
25358 tree tmpl
= DECL_TI_TEMPLATE (fn
);
25359 if (tree org
= DECL_ABSTRACT_ORIGIN (tmpl
))
25360 return PRIMARY_TEMPLATE_P (org
);
25364 /* OLDDECL is a _DECL for a template parameter. Return a similar parameter at
25365 LEVEL:INDEX, using tsubst_args and complain for substitution into non-type
25366 template parameter types. Note that the handling of template template
25367 parameters relies on current_template_parms being set appropriately for the
25371 rewrite_template_parm (tree olddecl
, unsigned index
, unsigned level
,
25372 tree tsubst_args
, tsubst_flags_t complain
)
25374 tree oldidx
= get_template_parm_index (olddecl
);
25377 if (TREE_CODE (olddecl
) == TYPE_DECL
25378 || TREE_CODE (olddecl
) == TEMPLATE_DECL
)
25380 tree oldtype
= TREE_TYPE (olddecl
);
25381 newtype
= cxx_make_type (TREE_CODE (oldtype
));
25382 TYPE_MAIN_VARIANT (newtype
) = newtype
;
25383 if (TREE_CODE (oldtype
) == TEMPLATE_TYPE_PARM
)
25384 TEMPLATE_TYPE_PARM_FOR_CLASS (newtype
)
25385 = TEMPLATE_TYPE_PARM_FOR_CLASS (oldtype
);
25388 newtype
= tsubst (TREE_TYPE (olddecl
), tsubst_args
,
25389 complain
, NULL_TREE
);
25392 = build_decl (DECL_SOURCE_LOCATION (olddecl
), TREE_CODE (olddecl
),
25393 DECL_NAME (olddecl
), newtype
);
25394 SET_DECL_TEMPLATE_PARM_P (newdecl
);
25397 if (TREE_CODE (olddecl
) == TYPE_DECL
25398 || TREE_CODE (olddecl
) == TEMPLATE_DECL
)
25400 newidx
= TEMPLATE_TYPE_PARM_INDEX (newtype
)
25401 = build_template_parm_index (index
, level
, level
,
25403 TEMPLATE_PARM_PARAMETER_PACK (newidx
)
25404 = TEMPLATE_PARM_PARAMETER_PACK (oldidx
);
25405 TYPE_STUB_DECL (newtype
) = TYPE_NAME (newtype
) = newdecl
;
25406 TYPE_CANONICAL (newtype
) = canonical_type_parameter (newtype
);
25408 if (TREE_CODE (olddecl
) == TEMPLATE_DECL
)
25410 DECL_TEMPLATE_RESULT (newdecl
)
25411 = build_decl (DECL_SOURCE_LOCATION (olddecl
), TYPE_DECL
,
25412 DECL_NAME (olddecl
), newtype
);
25413 DECL_ARTIFICIAL (DECL_TEMPLATE_RESULT (newdecl
)) = true;
25414 // First create a copy (ttargs) of tsubst_args with an
25415 // additional level for the template template parameter's own
25416 // template parameters (ttparms).
25417 tree ttparms
= (INNERMOST_TEMPLATE_PARMS
25418 (DECL_TEMPLATE_PARMS (olddecl
)));
25419 const int depth
= TMPL_ARGS_DEPTH (tsubst_args
);
25420 tree ttargs
= make_tree_vec (depth
+ 1);
25421 for (int i
= 0; i
< depth
; ++i
)
25422 TREE_VEC_ELT (ttargs
, i
) = TREE_VEC_ELT (tsubst_args
, i
);
25423 TREE_VEC_ELT (ttargs
, depth
)
25424 = template_parms_level_to_args (ttparms
);
25425 // Substitute ttargs into ttparms to fix references to
25426 // other template parameters.
25427 ttparms
= tsubst_template_parms_level (ttparms
, ttargs
,
25429 // Now substitute again with args based on tparms, to reduce
25430 // the level of the ttparms.
25431 ttargs
= current_template_args ();
25432 ttparms
= tsubst_template_parms_level (ttparms
, ttargs
,
25434 // Finally, tack the adjusted parms onto tparms.
25435 ttparms
= tree_cons (size_int (depth
), ttparms
,
25436 current_template_parms
);
25437 DECL_TEMPLATE_PARMS (newdecl
) = ttparms
;
25442 tree oldconst
= TEMPLATE_PARM_DECL (oldidx
);
25444 = build_decl (DECL_SOURCE_LOCATION (oldconst
),
25445 TREE_CODE (oldconst
),
25446 DECL_NAME (oldconst
), newtype
);
25447 TREE_CONSTANT (newconst
) = TREE_CONSTANT (newdecl
)
25448 = TREE_READONLY (newconst
) = TREE_READONLY (newdecl
) = true;
25449 SET_DECL_TEMPLATE_PARM_P (newconst
);
25450 newidx
= build_template_parm_index (index
, level
, level
,
25451 newconst
, newtype
);
25452 TEMPLATE_PARM_PARAMETER_PACK (newidx
)
25453 = TEMPLATE_PARM_PARAMETER_PACK (oldidx
);
25454 DECL_INITIAL (newdecl
) = DECL_INITIAL (newconst
) = newidx
;
25460 /* Returns a C++17 class deduction guide template based on the constructor
25461 CTOR. As a special case, CTOR can be a RECORD_TYPE for an implicit default
25462 guide, or REFERENCE_TYPE for an implicit copy/move guide. */
25465 build_deduction_guide (tree ctor
, tree outer_args
, tsubst_flags_t complain
)
25467 tree type
, tparms
, targs
, fparms
, fargs
, ci
;
25468 bool memtmpl
= false;
25471 tree fn_tmpl
= NULL_TREE
;
25476 bool copy_p
= TREE_CODE (type
) == REFERENCE_TYPE
;
25479 type
= TREE_TYPE (type
);
25480 fparms
= tree_cons (NULL_TREE
, type
, void_list_node
);
25483 fparms
= void_list_node
;
25485 tree ctmpl
= CLASSTYPE_TI_TEMPLATE (type
);
25486 tparms
= DECL_TEMPLATE_PARMS (ctmpl
);
25487 targs
= CLASSTYPE_TI_ARGS (type
);
25490 loc
= DECL_SOURCE_LOCATION (ctmpl
);
25491 explicit_p
= false;
25495 ++processing_template_decl
;
25498 = (TREE_CODE (ctor
) == TEMPLATE_DECL
? ctor
25499 : DECL_TI_TEMPLATE (ctor
));
25501 fn_tmpl
= tsubst (fn_tmpl
, outer_args
, complain
, ctor
);
25502 ctor
= DECL_TEMPLATE_RESULT (fn_tmpl
);
25504 type
= DECL_CONTEXT (ctor
);
25506 tparms
= DECL_TEMPLATE_PARMS (fn_tmpl
);
25507 /* If type is a member class template, DECL_TI_ARGS (ctor) will have
25508 fully specialized args for the enclosing class. Strip those off, as
25509 the deduction guide won't have those template parameters. */
25510 targs
= get_innermost_template_args (DECL_TI_ARGS (ctor
),
25511 TMPL_PARMS_DEPTH (tparms
));
25512 /* Discard the 'this' parameter. */
25513 fparms
= FUNCTION_ARG_CHAIN (ctor
);
25514 fargs
= TREE_CHAIN (DECL_ARGUMENTS (ctor
));
25515 ci
= get_constraints (ctor
);
25516 loc
= DECL_SOURCE_LOCATION (ctor
);
25517 explicit_p
= DECL_NONCONVERTING_P (ctor
);
25519 if (PRIMARY_TEMPLATE_P (fn_tmpl
))
25523 /* For a member template constructor, we need to flatten the two
25524 template parameter lists into one, and then adjust the function
25525 signature accordingly. This gets...complicated. */
25526 tree save_parms
= current_template_parms
;
25528 /* For a member template we should have two levels of parms/args, one
25529 for the class and one for the constructor. We stripped
25530 specialized args for further enclosing classes above. */
25531 const int depth
= 2;
25532 gcc_assert (TMPL_ARGS_DEPTH (targs
) == depth
);
25534 /* Template args for translating references to the two-level template
25535 parameters into references to the one-level template parameters we
25537 tree tsubst_args
= copy_node (targs
);
25538 TMPL_ARGS_LEVEL (tsubst_args
, depth
)
25539 = copy_node (TMPL_ARGS_LEVEL (tsubst_args
, depth
));
25541 /* Template parms for the constructor template. */
25542 tree ftparms
= TREE_VALUE (tparms
);
25543 unsigned flen
= TREE_VEC_LENGTH (ftparms
);
25544 /* Template parms for the class template. */
25545 tparms
= TREE_CHAIN (tparms
);
25546 tree ctparms
= TREE_VALUE (tparms
);
25547 unsigned clen
= TREE_VEC_LENGTH (ctparms
);
25548 /* Template parms for the deduction guide start as a copy of the
25549 template parms for the class. We set current_template_parms for
25550 lookup_template_class_1. */
25551 current_template_parms
= tparms
= copy_node (tparms
);
25552 tree new_vec
= TREE_VALUE (tparms
) = make_tree_vec (flen
+ clen
);
25553 for (unsigned i
= 0; i
< clen
; ++i
)
25554 TREE_VEC_ELT (new_vec
, i
) = TREE_VEC_ELT (ctparms
, i
);
25556 /* Now we need to rewrite the constructor parms to append them to the
25558 for (unsigned i
= 0; i
< flen
; ++i
)
25560 unsigned index
= i
+ clen
;
25561 unsigned level
= 1;
25562 tree oldelt
= TREE_VEC_ELT (ftparms
, i
);
25563 tree olddecl
= TREE_VALUE (oldelt
);
25564 tree newdecl
= rewrite_template_parm (olddecl
, index
, level
,
25565 tsubst_args
, complain
);
25566 tree newdef
= tsubst_template_arg (TREE_PURPOSE (oldelt
),
25567 tsubst_args
, complain
, ctor
);
25568 tree list
= build_tree_list (newdef
, newdecl
);
25569 TEMPLATE_PARM_CONSTRAINTS (list
)
25570 = tsubst_constraint_info (TEMPLATE_PARM_CONSTRAINTS (oldelt
),
25571 tsubst_args
, complain
, ctor
);
25572 TREE_VEC_ELT (new_vec
, index
) = list
;
25573 TMPL_ARG (tsubst_args
, depth
, i
) = template_parm_to_arg (list
);
25576 /* Now we have a final set of template parms to substitute into the
25577 function signature. */
25578 targs
= template_parms_to_args (tparms
);
25579 fparms
= tsubst_arg_types (fparms
, tsubst_args
, NULL_TREE
,
25581 fargs
= tsubst (fargs
, tsubst_args
, complain
, ctor
);
25583 ci
= tsubst_constraint_info (ci
, tsubst_args
, complain
, ctor
);
25585 current_template_parms
= save_parms
;
25587 --processing_template_decl
;
25592 /* Copy the parms so we can set DECL_PRIMARY_TEMPLATE. */
25593 tparms
= copy_node (tparms
);
25594 INNERMOST_TEMPLATE_PARMS (tparms
)
25595 = copy_node (INNERMOST_TEMPLATE_PARMS (tparms
));
25598 tree fntype
= build_function_type (type
, fparms
);
25599 tree ded_fn
= build_lang_decl_loc (loc
,
25601 dguide_name (type
), fntype
);
25602 DECL_ARGUMENTS (ded_fn
) = fargs
;
25603 DECL_ARTIFICIAL (ded_fn
) = true;
25604 DECL_NONCONVERTING_P (ded_fn
) = explicit_p
;
25605 tree ded_tmpl
= build_template_decl (ded_fn
, tparms
, /*member*/false);
25606 DECL_ARTIFICIAL (ded_tmpl
) = true;
25607 DECL_TEMPLATE_RESULT (ded_tmpl
) = ded_fn
;
25608 TREE_TYPE (ded_tmpl
) = TREE_TYPE (ded_fn
);
25609 DECL_TEMPLATE_INFO (ded_fn
) = build_template_info (ded_tmpl
, targs
);
25610 DECL_PRIMARY_TEMPLATE (ded_tmpl
) = ded_tmpl
;
25612 DECL_ABSTRACT_ORIGIN (ded_tmpl
) = fn_tmpl
;
25614 set_constraints (ded_tmpl
, ci
);
25619 /* Deduce template arguments for the class template placeholder PTYPE for
25620 template TMPL based on the initializer INIT, and return the resulting
25624 do_class_deduction (tree ptype
, tree tmpl
, tree init
, int flags
,
25625 tsubst_flags_t complain
)
25627 if (!DECL_CLASS_TEMPLATE_P (tmpl
))
25629 /* We should have handled this in the caller. */
25630 if (DECL_TEMPLATE_TEMPLATE_PARM_P (tmpl
))
25632 if (complain
& tf_error
)
25633 error ("non-class template %qT used without template arguments", tmpl
);
25634 return error_mark_node
;
25637 tree type
= TREE_TYPE (tmpl
);
25639 bool try_list_ctor
= false;
25641 vec
<tree
,va_gc
> *args
;
25642 if (init
== NULL_TREE
25643 || TREE_CODE (init
) == TREE_LIST
)
25644 args
= make_tree_vector_from_list (init
);
25645 else if (BRACE_ENCLOSED_INITIALIZER_P (init
))
25647 try_list_ctor
= TYPE_HAS_LIST_CTOR (type
);
25648 if (try_list_ctor
&& CONSTRUCTOR_NELTS (init
) == 1)
25650 /* As an exception, the first phase in 16.3.1.7 (considering the
25651 initializer list as a single argument) is omitted if the
25652 initializer list consists of a single expression of type cv U,
25653 where U is a specialization of C or a class derived from a
25654 specialization of C. */
25655 tree elt
= CONSTRUCTOR_ELT (init
, 0)->value
;
25656 tree etype
= TREE_TYPE (elt
);
25658 tree tparms
= INNERMOST_TEMPLATE_PARMS (DECL_TEMPLATE_PARMS (tmpl
));
25659 tree targs
= make_tree_vec (TREE_VEC_LENGTH (tparms
));
25660 int err
= unify (tparms
, targs
, type
, etype
,
25661 UNIFY_ALLOW_DERIVED
, /*explain*/false);
25663 try_list_ctor
= false;
25666 if (try_list_ctor
|| is_std_init_list (type
))
25667 args
= make_tree_vector_single (init
);
25669 args
= make_tree_vector_from_ctor (init
);
25672 args
= make_tree_vector_single (init
);
25674 tree dname
= dguide_name (tmpl
);
25675 tree cands
= lookup_qualified_name (CP_DECL_CONTEXT (tmpl
), dname
,
25676 /*type*/false, /*complain*/false,
25678 bool elided
= false;
25679 if (cands
== error_mark_node
)
25682 /* Prune explicit deduction guides in copy-initialization context. */
25683 if (flags
& LOOKUP_ONLYCONVERTING
)
25685 for (lkp_iterator
iter (cands
); !elided
&& iter
; ++iter
)
25686 if (DECL_NONCONVERTING_P (STRIP_TEMPLATE (*iter
)))
25691 /* Found a nonconverting guide, prune the candidates. */
25692 tree pruned
= NULL_TREE
;
25693 for (lkp_iterator
iter (cands
); iter
; ++iter
)
25694 if (!DECL_NONCONVERTING_P (STRIP_TEMPLATE (*iter
)))
25695 pruned
= lookup_add (*iter
, pruned
);
25701 tree outer_args
= NULL_TREE
;
25702 if (DECL_CLASS_SCOPE_P (tmpl
)
25703 && CLASSTYPE_TEMPLATE_INFO (DECL_CONTEXT (tmpl
)))
25705 outer_args
= CLASSTYPE_TI_ARGS (DECL_CONTEXT (tmpl
));
25706 type
= TREE_TYPE (most_general_template (tmpl
));
25709 bool saw_ctor
= false;
25710 // FIXME cache artificial deduction guides
25711 for (ovl_iterator
iter (CLASSTYPE_CONSTRUCTORS (type
)); iter
; ++iter
)
25713 tree guide
= build_deduction_guide (*iter
, outer_args
, complain
);
25714 if ((flags
& LOOKUP_ONLYCONVERTING
)
25715 && DECL_NONCONVERTING_P (STRIP_TEMPLATE (guide
)))
25718 cands
= lookup_add (guide
, cands
);
25723 tree call
= error_mark_node
;
25725 /* If this is list-initialization and the class has a list constructor, first
25726 try deducing from the list as a single argument, as [over.match.list]. */
25727 tree list_cands
= NULL_TREE
;
25728 if (try_list_ctor
&& cands
)
25729 for (lkp_iterator
iter (cands
); iter
; ++iter
)
25732 if (is_list_ctor (dg
))
25733 list_cands
= lookup_add (dg
, list_cands
);
25737 ++cp_unevaluated_operand
;
25738 call
= build_new_function_call (list_cands
, &args
, tf_decltype
);
25739 --cp_unevaluated_operand
;
25741 if (call
== error_mark_node
)
25743 /* That didn't work, now try treating the list as a sequence of
25745 release_tree_vector (args
);
25746 args
= make_tree_vector_from_ctor (init
);
25750 /* Maybe generate an implicit deduction guide. */
25751 if (call
== error_mark_node
&& args
->length () < 2)
25753 tree gtype
= NULL_TREE
;
25755 if (args
->length () == 1)
25756 /* Generate a copy guide. */
25757 gtype
= build_reference_type (type
);
25758 else if (!saw_ctor
)
25759 /* Generate a default guide. */
25764 tree guide
= build_deduction_guide (gtype
, outer_args
, complain
);
25765 cands
= lookup_add (guide
, cands
);
25769 if (elided
&& !cands
)
25771 error ("cannot deduce template arguments for copy-initialization"
25772 " of %qT, as it has no non-explicit deduction guides or "
25773 "user-declared constructors", type
);
25774 return error_mark_node
;
25776 else if (!cands
&& call
== error_mark_node
)
25778 error ("cannot deduce template arguments of %qT, as it has no viable "
25779 "deduction guides", type
);
25780 return error_mark_node
;
25783 if (call
== error_mark_node
)
25785 ++cp_unevaluated_operand
;
25786 call
= build_new_function_call (cands
, &args
, tf_decltype
);
25787 --cp_unevaluated_operand
;
25790 if (call
== error_mark_node
&& (complain
& tf_warning_or_error
))
25792 error ("class template argument deduction failed:");
25794 ++cp_unevaluated_operand
;
25795 call
= build_new_function_call (cands
, &args
, complain
| tf_decltype
);
25796 --cp_unevaluated_operand
;
25799 inform (input_location
, "explicit deduction guides not considered "
25800 "for copy-initialization");
25803 release_tree_vector (args
);
25805 return cp_build_qualified_type (TREE_TYPE (call
), cp_type_quals (ptype
));
25808 /* Replace occurrences of 'auto' in TYPE with the appropriate type deduced
25809 from INIT. AUTO_NODE is the TEMPLATE_TYPE_PARM used for 'auto' in TYPE. */
25812 do_auto_deduction (tree type
, tree init
, tree auto_node
)
25814 return do_auto_deduction (type
, init
, auto_node
,
25815 tf_warning_or_error
,
25819 /* Replace occurrences of 'auto' in TYPE with the appropriate type deduced
25820 from INIT. AUTO_NODE is the TEMPLATE_TYPE_PARM used for 'auto' in TYPE.
25821 The CONTEXT determines the context in which auto deduction is performed
25822 and is used to control error diagnostics. FLAGS are the LOOKUP_* flags.
25823 OUTER_TARGS are used during template argument deduction
25824 (context == adc_unify) to properly substitute the result, and is ignored
25827 For partial-concept-ids, extra args may be appended to the list of deduced
25828 template arguments prior to determining constraint satisfaction. */
25831 do_auto_deduction (tree type
, tree init
, tree auto_node
,
25832 tsubst_flags_t complain
, auto_deduction_context context
,
25833 tree outer_targs
, int flags
)
25837 if (init
== error_mark_node
)
25838 return error_mark_node
;
25840 if (init
&& type_dependent_expression_p (init
)
25841 && context
!= adc_unify
)
25842 /* Defining a subset of type-dependent expressions that we can deduce
25843 from ahead of time isn't worth the trouble. */
25846 if (tree tmpl
= CLASS_PLACEHOLDER_TEMPLATE (auto_node
))
25847 /* C++17 class template argument deduction. */
25848 return do_class_deduction (type
, tmpl
, init
, flags
, complain
);
25850 if (TREE_TYPE (init
) == NULL_TREE
)
25851 /* Nothing we can do with this, even in deduction context. */
25854 /* [dcl.spec.auto]: Obtain P from T by replacing the occurrences of auto
25855 with either a new invented type template parameter U or, if the
25856 initializer is a braced-init-list (8.5.4), with
25857 std::initializer_list<U>. */
25858 if (BRACE_ENCLOSED_INITIALIZER_P (init
))
25860 if (!DIRECT_LIST_INIT_P (init
))
25861 type
= listify_autos (type
, auto_node
);
25862 else if (CONSTRUCTOR_NELTS (init
) == 1)
25863 init
= CONSTRUCTOR_ELT (init
, 0)->value
;
25866 if (complain
& tf_warning_or_error
)
25868 if (permerror (input_location
, "direct-list-initialization of "
25869 "%<auto%> requires exactly one element"))
25870 inform (input_location
,
25871 "for deduction to %<std::initializer_list%>, use copy-"
25872 "list-initialization (i.e. add %<=%> before the %<{%>)");
25874 type
= listify_autos (type
, auto_node
);
25878 if (type
== error_mark_node
)
25879 return error_mark_node
;
25881 init
= resolve_nondeduced_context (init
, complain
);
25883 if (context
== adc_decomp_type
25884 && auto_node
== type
25885 && init
!= error_mark_node
25886 && TREE_CODE (TREE_TYPE (init
)) == ARRAY_TYPE
)
25887 /* [dcl.decomp]/1 - if decomposition declaration has no ref-qualifiers
25888 and initializer has array type, deduce cv-qualified array type. */
25889 return cp_build_qualified_type_real (TREE_TYPE (init
), TYPE_QUALS (type
),
25891 else if (AUTO_IS_DECLTYPE (auto_node
))
25893 bool id
= (DECL_P (init
)
25894 || ((TREE_CODE (init
) == COMPONENT_REF
25895 || TREE_CODE (init
) == SCOPE_REF
)
25896 && !REF_PARENTHESIZED_P (init
)));
25897 targs
= make_tree_vec (1);
25898 TREE_VEC_ELT (targs
, 0)
25899 = finish_decltype_type (init
, id
, tf_warning_or_error
);
25900 if (type
!= auto_node
)
25902 if (complain
& tf_error
)
25903 error ("%qT as type rather than plain %<decltype(auto)%>", type
);
25904 return error_mark_node
;
25909 tree parms
= build_tree_list (NULL_TREE
, type
);
25913 tparms
= extract_autos (type
);
25916 tparms
= make_tree_vec (1);
25917 TREE_VEC_ELT (tparms
, 0)
25918 = build_tree_list (NULL_TREE
, TYPE_NAME (auto_node
));
25921 targs
= make_tree_vec (TREE_VEC_LENGTH (tparms
));
25922 int val
= type_unification_real (tparms
, targs
, parms
, &init
, 1, 0,
25923 DEDUCE_CALL
, LOOKUP_NORMAL
,
25924 NULL
, /*explain_p=*/false);
25927 if (processing_template_decl
)
25928 /* Try again at instantiation time. */
25930 if (type
&& type
!= error_mark_node
25931 && (complain
& tf_error
))
25932 /* If type is error_mark_node a diagnostic must have been
25933 emitted by now. Also, having a mention to '<type error>'
25934 in the diagnostic is not really useful to the user. */
25936 if (cfun
&& auto_node
== current_function_auto_return_pattern
25937 && LAMBDA_FUNCTION_P (current_function_decl
))
25938 error ("unable to deduce lambda return type from %qE", init
);
25940 error ("unable to deduce %qT from %qE", type
, init
);
25941 type_unification_real (tparms
, targs
, parms
, &init
, 1, 0,
25942 DEDUCE_CALL
, LOOKUP_NORMAL
,
25943 NULL
, /*explain_p=*/true);
25945 return error_mark_node
;
25949 /* Check any placeholder constraints against the deduced type. */
25950 if (flag_concepts
&& !processing_template_decl
)
25951 if (tree constr
= PLACEHOLDER_TYPE_CONSTRAINTS (auto_node
))
25953 /* Use the deduced type to check the associated constraints. If we
25954 have a partial-concept-id, rebuild the argument list so that
25955 we check using the extra arguments. */
25956 gcc_assert (TREE_CODE (constr
) == CHECK_CONSTR
);
25957 tree cargs
= CHECK_CONSTR_ARGS (constr
);
25958 if (TREE_VEC_LENGTH (cargs
) > 1)
25960 cargs
= copy_node (cargs
);
25961 TREE_VEC_ELT (cargs
, 0) = TREE_VEC_ELT (targs
, 0);
25965 if (!constraints_satisfied_p (constr
, cargs
))
25967 if (complain
& tf_warning_or_error
)
25971 case adc_unspecified
:
25973 error("placeholder constraints not satisfied");
25975 case adc_variable_type
:
25976 case adc_decomp_type
:
25977 error ("deduced initializer does not satisfy "
25978 "placeholder constraints");
25980 case adc_return_type
:
25981 error ("deduced return type does not satisfy "
25982 "placeholder constraints");
25984 case adc_requirement
:
25985 error ("deduced expression type does not satisfy "
25986 "placeholder constraints");
25989 diagnose_constraints (input_location
, constr
, targs
);
25991 return error_mark_node
;
25995 if (processing_template_decl
&& context
!= adc_unify
)
25996 outer_targs
= current_template_args ();
25997 targs
= add_to_template_args (outer_targs
, targs
);
25998 return tsubst (type
, targs
, complain
, NULL_TREE
);
26001 /* Substitutes LATE_RETURN_TYPE for 'auto' in TYPE and returns the
26005 splice_late_return_type (tree type
, tree late_return_type
)
26007 if (is_auto (type
))
26009 if (late_return_type
)
26010 return late_return_type
;
26012 tree idx
= get_template_parm_index (type
);
26013 if (TEMPLATE_PARM_LEVEL (idx
) <= processing_template_decl
)
26014 /* In an abbreviated function template we didn't know we were dealing
26015 with a function template when we saw the auto return type, so update
26016 it to have the correct level. */
26017 return make_auto_1 (TYPE_IDENTIFIER (type
), true);
26022 /* Returns true iff TYPE is a TEMPLATE_TYPE_PARM representing 'auto' or
26023 'decltype(auto)' or a deduced class template. */
26026 is_auto (const_tree type
)
26028 if (TREE_CODE (type
) == TEMPLATE_TYPE_PARM
26029 && (TYPE_IDENTIFIER (type
) == auto_identifier
26030 || TYPE_IDENTIFIER (type
) == decltype_auto_identifier
26031 || CLASS_PLACEHOLDER_TEMPLATE (type
)))
26037 /* for_each_template_parm callback for type_uses_auto. */
26040 is_auto_r (tree tp
, void */
*data*/
)
26042 return is_auto (tp
);
26045 /* Returns the TEMPLATE_TYPE_PARM in TYPE representing `auto' iff TYPE contains
26046 a use of `auto'. Returns NULL_TREE otherwise. */
26049 type_uses_auto (tree type
)
26051 if (type
== NULL_TREE
)
26053 else if (flag_concepts
)
26055 /* The Concepts TS allows multiple autos in one type-specifier; just
26056 return the first one we find, do_auto_deduction will collect all of
26058 if (uses_template_parms (type
))
26059 return for_each_template_parm (type
, is_auto_r
, /*data*/NULL
,
26060 /*visited*/NULL
, /*nondeduced*/true);
26065 return find_type_usage (type
, is_auto
);
26068 /* For a given template T, return the vector of typedefs referenced
26069 in T for which access check is needed at T instantiation time.
26070 T is either a FUNCTION_DECL or a RECORD_TYPE.
26071 Those typedefs were added to T by the function
26072 append_type_to_template_for_access_check. */
26074 vec
<qualified_typedef_usage_t
, va_gc
> *
26075 get_types_needing_access_check (tree t
)
26078 vec
<qualified_typedef_usage_t
, va_gc
> *result
= NULL
;
26080 if (!t
|| t
== error_mark_node
)
26083 if (!(ti
= get_template_info (t
)))
26086 if (CLASS_TYPE_P (t
)
26087 || TREE_CODE (t
) == FUNCTION_DECL
)
26089 if (!TI_TEMPLATE (ti
))
26092 result
= TI_TYPEDEFS_NEEDING_ACCESS_CHECKING (ti
);
26098 /* Append the typedef TYPE_DECL used in template T to a list of typedefs
26099 tied to T. That list of typedefs will be access checked at
26100 T instantiation time.
26101 T is either a FUNCTION_DECL or a RECORD_TYPE.
26102 TYPE_DECL is a TYPE_DECL node representing a typedef.
26103 SCOPE is the scope through which TYPE_DECL is accessed.
26104 LOCATION is the location of the usage point of TYPE_DECL.
26106 This function is a subroutine of
26107 append_type_to_template_for_access_check. */
26110 append_type_to_template_for_access_check_1 (tree t
,
26113 location_t location
)
26115 qualified_typedef_usage_t typedef_usage
;
26118 if (!t
|| t
== error_mark_node
)
26121 gcc_assert ((TREE_CODE (t
) == FUNCTION_DECL
26122 || CLASS_TYPE_P (t
))
26124 && TREE_CODE (type_decl
) == TYPE_DECL
26127 if (!(ti
= get_template_info (t
)))
26130 gcc_assert (TI_TEMPLATE (ti
));
26132 typedef_usage
.typedef_decl
= type_decl
;
26133 typedef_usage
.context
= scope
;
26134 typedef_usage
.locus
= location
;
26136 vec_safe_push (TI_TYPEDEFS_NEEDING_ACCESS_CHECKING (ti
), typedef_usage
);
26139 /* Append TYPE_DECL to the template TEMPL.
26140 TEMPL is either a class type, a FUNCTION_DECL or a a TEMPLATE_DECL.
26141 At TEMPL instanciation time, TYPE_DECL will be checked to see
26142 if it can be accessed through SCOPE.
26143 LOCATION is the location of the usage point of TYPE_DECL.
26145 e.g. consider the following code snippet:
26152 template<class U> struct S
26154 C::myint mi; // <-- usage point of the typedef C::myint
26159 At S<char> instantiation time, we need to check the access of C::myint
26160 In other words, we need to check the access of the myint typedef through
26161 the C scope. For that purpose, this function will add the myint typedef
26162 and the scope C through which its being accessed to a list of typedefs
26163 tied to the template S. That list will be walked at template instantiation
26164 time and access check performed on each typedefs it contains.
26165 Note that this particular code snippet should yield an error because
26166 myint is private to C. */
26169 append_type_to_template_for_access_check (tree templ
,
26172 location_t location
)
26174 qualified_typedef_usage_t
*iter
;
26177 gcc_assert (type_decl
&& (TREE_CODE (type_decl
) == TYPE_DECL
));
26179 /* Make sure we don't append the type to the template twice. */
26180 FOR_EACH_VEC_SAFE_ELT (get_types_needing_access_check (templ
), i
, iter
)
26181 if (iter
->typedef_decl
== type_decl
&& scope
== iter
->context
)
26184 append_type_to_template_for_access_check_1 (templ
, type_decl
,
26188 /* Convert the generic type parameters in PARM that match the types given in the
26189 range [START_IDX, END_IDX) from the current_template_parms into generic type
26193 convert_generic_types_to_packs (tree parm
, int start_idx
, int end_idx
)
26195 tree current
= current_template_parms
;
26196 int depth
= TMPL_PARMS_DEPTH (current
);
26197 current
= INNERMOST_TEMPLATE_PARMS (current
);
26198 tree replacement
= make_tree_vec (TREE_VEC_LENGTH (current
));
26200 for (int i
= 0; i
< start_idx
; ++i
)
26201 TREE_VEC_ELT (replacement
, i
)
26202 = TREE_TYPE (TREE_VALUE (TREE_VEC_ELT (current
, i
)));
26204 for (int i
= start_idx
; i
< end_idx
; ++i
)
26206 /* Create a distinct parameter pack type from the current parm and add it
26207 to the replacement args to tsubst below into the generic function
26210 tree o
= TREE_TYPE (TREE_VALUE
26211 (TREE_VEC_ELT (current
, i
)));
26212 tree t
= copy_type (o
);
26213 TEMPLATE_TYPE_PARM_INDEX (t
)
26214 = reduce_template_parm_level (TEMPLATE_TYPE_PARM_INDEX (o
),
26216 TREE_TYPE (TEMPLATE_TYPE_DECL (t
)) = t
;
26217 TYPE_STUB_DECL (t
) = TYPE_NAME (t
) = TEMPLATE_TYPE_DECL (t
);
26218 TYPE_MAIN_VARIANT (t
) = t
;
26219 TEMPLATE_TYPE_PARAMETER_PACK (t
) = true;
26220 TYPE_CANONICAL (t
) = canonical_type_parameter (t
);
26221 TREE_VEC_ELT (replacement
, i
) = t
;
26222 TREE_VALUE (TREE_VEC_ELT (current
, i
)) = TREE_CHAIN (t
);
26225 for (int i
= end_idx
, e
= TREE_VEC_LENGTH (current
); i
< e
; ++i
)
26226 TREE_VEC_ELT (replacement
, i
)
26227 = TREE_TYPE (TREE_VALUE (TREE_VEC_ELT (current
, i
)));
26229 /* If there are more levels then build up the replacement with the outer
26232 replacement
= add_to_template_args (template_parms_to_args
26233 (TREE_CHAIN (current_template_parms
)),
26236 return tsubst (parm
, replacement
, tf_none
, NULL_TREE
);
26239 /* Entries in the decl_constraint hash table. */
26240 struct GTY((for_user
)) constr_entry
26246 /* Hashing function and equality for constraint entries. */
26247 struct constr_hasher
: ggc_ptr_hash
<constr_entry
>
26249 static hashval_t
hash (constr_entry
*e
)
26251 return (hashval_t
)DECL_UID (e
->decl
);
26254 static bool equal (constr_entry
*e1
, constr_entry
*e2
)
26256 return e1
->decl
== e2
->decl
;
26260 /* A mapping from declarations to constraint information. Note that
26261 both templates and their underlying declarations are mapped to the
26262 same constraint information.
26264 FIXME: This is defined in pt.c because garbage collection
26265 code is not being generated for constraint.cc. */
26267 static GTY (()) hash_table
<constr_hasher
> *decl_constraints
;
26269 /* Returns the template constraints of declaration T. If T is not
26270 constrained, return NULL_TREE. Note that T must be non-null. */
26273 get_constraints (tree t
)
26275 if (!flag_concepts
)
26278 gcc_assert (DECL_P (t
));
26279 if (TREE_CODE (t
) == TEMPLATE_DECL
)
26280 t
= DECL_TEMPLATE_RESULT (t
);
26281 constr_entry elt
= { t
, NULL_TREE
};
26282 constr_entry
* found
= decl_constraints
->find (&elt
);
26289 /* Associate the given constraint information CI with the declaration
26290 T. If T is a template, then the constraints are associated with
26291 its underlying declaration. Don't build associations if CI is
26295 set_constraints (tree t
, tree ci
)
26299 gcc_assert (t
&& flag_concepts
);
26300 if (TREE_CODE (t
) == TEMPLATE_DECL
)
26301 t
= DECL_TEMPLATE_RESULT (t
);
26302 gcc_assert (!get_constraints (t
));
26303 constr_entry elt
= {t
, ci
};
26304 constr_entry
** slot
= decl_constraints
->find_slot (&elt
, INSERT
);
26305 constr_entry
* entry
= ggc_alloc
<constr_entry
> ();
26310 /* Remove the associated constraints of the declaration T. */
26313 remove_constraints (tree t
)
26315 gcc_assert (DECL_P (t
));
26316 if (TREE_CODE (t
) == TEMPLATE_DECL
)
26317 t
= DECL_TEMPLATE_RESULT (t
);
26319 constr_entry elt
= {t
, NULL_TREE
};
26320 constr_entry
** slot
= decl_constraints
->find_slot (&elt
, NO_INSERT
);
26322 decl_constraints
->clear_slot (slot
);
26325 /* Memoized satisfaction results for declarations. This
26326 maps the pair (constraint_info, arguments) to the result computed
26327 by constraints_satisfied_p. */
26329 struct GTY((for_user
)) constraint_sat_entry
26336 /* Hashing function and equality for constraint entries. */
26338 struct constraint_sat_hasher
: ggc_ptr_hash
<constraint_sat_entry
>
26340 static hashval_t
hash (constraint_sat_entry
*e
)
26342 hashval_t val
= iterative_hash_object(e
->ci
, 0);
26343 return iterative_hash_template_arg (e
->args
, val
);
26346 static bool equal (constraint_sat_entry
*e1
, constraint_sat_entry
*e2
)
26348 return e1
->ci
== e2
->ci
&& comp_template_args (e1
->args
, e2
->args
);
26352 /* Memoized satisfaction results for concept checks. */
26354 struct GTY((for_user
)) concept_spec_entry
26361 /* Hashing function and equality for constraint entries. */
26363 struct concept_spec_hasher
: ggc_ptr_hash
<concept_spec_entry
>
26365 static hashval_t
hash (concept_spec_entry
*e
)
26367 return hash_tmpl_and_args (e
->tmpl
, e
->args
);
26370 static bool equal (concept_spec_entry
*e1
, concept_spec_entry
*e2
)
26372 ++comparing_specializations
;
26373 bool eq
= e1
->tmpl
== e2
->tmpl
&& comp_template_args (e1
->args
, e2
->args
);
26374 --comparing_specializations
;
26379 static GTY (()) hash_table
<constraint_sat_hasher
> *constraint_memos
;
26380 static GTY (()) hash_table
<concept_spec_hasher
> *concept_memos
;
26382 /* Search for a memoized satisfaction result. Returns one of the
26383 truth value nodes if previously memoized, or NULL_TREE otherwise. */
26386 lookup_constraint_satisfaction (tree ci
, tree args
)
26388 constraint_sat_entry elt
= { ci
, args
, NULL_TREE
};
26389 constraint_sat_entry
* found
= constraint_memos
->find (&elt
);
26391 return found
->result
;
26396 /* Memoize the result of a satisfication test. Returns the saved result. */
26399 memoize_constraint_satisfaction (tree ci
, tree args
, tree result
)
26401 constraint_sat_entry elt
= {ci
, args
, result
};
26402 constraint_sat_entry
** slot
= constraint_memos
->find_slot (&elt
, INSERT
);
26403 constraint_sat_entry
* entry
= ggc_alloc
<constraint_sat_entry
> ();
26409 /* Search for a memoized satisfaction result for a concept. */
26412 lookup_concept_satisfaction (tree tmpl
, tree args
)
26414 concept_spec_entry elt
= { tmpl
, args
, NULL_TREE
};
26415 concept_spec_entry
* found
= concept_memos
->find (&elt
);
26417 return found
->result
;
26422 /* Memoize the result of a concept check. Returns the saved result. */
26425 memoize_concept_satisfaction (tree tmpl
, tree args
, tree result
)
26427 concept_spec_entry elt
= {tmpl
, args
, result
};
26428 concept_spec_entry
** slot
= concept_memos
->find_slot (&elt
, INSERT
);
26429 concept_spec_entry
* entry
= ggc_alloc
<concept_spec_entry
> ();
26435 static GTY (()) hash_table
<concept_spec_hasher
> *concept_expansions
;
26437 /* Returns a prior concept specialization. This returns the substituted
26438 and normalized constraints defined by the concept. */
26441 get_concept_expansion (tree tmpl
, tree args
)
26443 concept_spec_entry elt
= { tmpl
, args
, NULL_TREE
};
26444 concept_spec_entry
* found
= concept_expansions
->find (&elt
);
26446 return found
->result
;
26451 /* Save a concept expansion for later. */
26454 save_concept_expansion (tree tmpl
, tree args
, tree def
)
26456 concept_spec_entry elt
= {tmpl
, args
, def
};
26457 concept_spec_entry
** slot
= concept_expansions
->find_slot (&elt
, INSERT
);
26458 concept_spec_entry
* entry
= ggc_alloc
<concept_spec_entry
> ();
26465 hash_subsumption_args (tree t1
, tree t2
)
26467 gcc_assert (TREE_CODE (t1
) == CHECK_CONSTR
);
26468 gcc_assert (TREE_CODE (t2
) == CHECK_CONSTR
);
26470 val
= iterative_hash_object (CHECK_CONSTR_CONCEPT (t1
), val
);
26471 val
= iterative_hash_template_arg (CHECK_CONSTR_ARGS (t1
), val
);
26472 val
= iterative_hash_object (CHECK_CONSTR_CONCEPT (t2
), val
);
26473 val
= iterative_hash_template_arg (CHECK_CONSTR_ARGS (t2
), val
);
26477 /* Compare the constraints of two subsumption entries. The LEFT1 and
26478 LEFT2 arguments comprise the first subsumption pair and the RIGHT1
26479 and RIGHT2 arguments comprise the second. These are all CHECK_CONSTRs. */
26482 comp_subsumption_args (tree left1
, tree left2
, tree right1
, tree right2
)
26484 if (CHECK_CONSTR_CONCEPT (left1
) == CHECK_CONSTR_CONCEPT (right1
))
26485 if (CHECK_CONSTR_CONCEPT (left2
) == CHECK_CONSTR_CONCEPT (right2
))
26486 if (comp_template_args (CHECK_CONSTR_ARGS (left1
),
26487 CHECK_CONSTR_ARGS (right1
)))
26488 return comp_template_args (CHECK_CONSTR_ARGS (left2
),
26489 CHECK_CONSTR_ARGS (right2
));
26493 /* Key/value pair for learning and memoizing subsumption results. This
26494 associates a pair of check constraints (including arguments) with
26495 a boolean value indicating the result. */
26497 struct GTY((for_user
)) subsumption_entry
26504 /* Hashing function and equality for constraint entries. */
26506 struct subsumption_hasher
: ggc_ptr_hash
<subsumption_entry
>
26508 static hashval_t
hash (subsumption_entry
*e
)
26510 return hash_subsumption_args (e
->t1
, e
->t2
);
26513 static bool equal (subsumption_entry
*e1
, subsumption_entry
*e2
)
26515 ++comparing_specializations
;
26516 bool eq
= comp_subsumption_args(e1
->t1
, e1
->t2
, e2
->t1
, e2
->t2
);
26517 --comparing_specializations
;
26522 static GTY (()) hash_table
<subsumption_hasher
> *subsumption_table
;
26524 /* Search for a previously cached subsumption result. */
26527 lookup_subsumption_result (tree t1
, tree t2
)
26529 subsumption_entry elt
= { t1
, t2
, false };
26530 subsumption_entry
* found
= subsumption_table
->find (&elt
);
26532 return &found
->result
;
26537 /* Save a subsumption result. */
26540 save_subsumption_result (tree t1
, tree t2
, bool result
)
26542 subsumption_entry elt
= {t1
, t2
, result
};
26543 subsumption_entry
** slot
= subsumption_table
->find_slot (&elt
, INSERT
);
26544 subsumption_entry
* entry
= ggc_alloc
<subsumption_entry
> ();
26550 /* Set up the hash table for constraint association. */
26553 init_constraint_processing (void)
26555 if (!flag_concepts
)
26558 decl_constraints
= hash_table
<constr_hasher
>::create_ggc(37);
26559 constraint_memos
= hash_table
<constraint_sat_hasher
>::create_ggc(37);
26560 concept_memos
= hash_table
<concept_spec_hasher
>::create_ggc(37);
26561 concept_expansions
= hash_table
<concept_spec_hasher
>::create_ggc(37);
26562 subsumption_table
= hash_table
<subsumption_hasher
>::create_ggc(37);
26565 /* __integer_pack(N) in a pack expansion expands to a sequence of numbers from
26569 declare_integer_pack (void)
26571 tree ipfn
= push_library_fn (get_identifier ("__integer_pack"),
26572 build_function_type_list (integer_type_node
,
26575 NULL_TREE
, ECF_CONST
);
26576 DECL_DECLARED_CONSTEXPR_P (ipfn
) = true;
26577 DECL_BUILT_IN_CLASS (ipfn
) = BUILT_IN_FRONTEND
;
26580 /* Set up the hash tables for template instantiations. */
26583 init_template_processing (void)
26585 decl_specializations
= hash_table
<spec_hasher
>::create_ggc (37);
26586 type_specializations
= hash_table
<spec_hasher
>::create_ggc (37);
26588 if (cxx_dialect
>= cxx11
)
26589 declare_integer_pack ();
26592 /* Print stats about the template hash tables for -fstats. */
26595 print_template_statistics (void)
26597 fprintf (stderr
, "decl_specializations: size %ld, %ld elements, "
26598 "%f collisions\n", (long) decl_specializations
->size (),
26599 (long) decl_specializations
->elements (),
26600 decl_specializations
->collisions ());
26601 fprintf (stderr
, "type_specializations: size %ld, %ld elements, "
26602 "%f collisions\n", (long) type_specializations
->size (),
26603 (long) type_specializations
->elements (),
26604 type_specializations
->collisions ());
26607 #include "gt-cp-pt.h"