1 /* Handle parameterized types (templates) for GNU C++.
2 Copyright (C) 1992, 93, 94, 95, 96, 1997 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 GNU CC.
8 GNU CC 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 2, or (at your option)
13 GNU CC 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 GNU CC; see the file COPYING. If not, write to
20 the Free Software Foundation, 59 Temple Place - Suite 330,
21 Boston, MA 02111-1307, USA. */
23 /* Known bugs or deficiencies include:
25 all methods must be provided in header files; can't use a source
26 file that contains only the method templates and "just win". */
43 /* The type of functions taking a tree, and some additional data, and
45 typedef int (*tree_fn_t
) PROTO((tree
, void*));
47 extern struct obstack permanent_obstack
;
50 extern char *input_filename
;
51 struct pending_inline
*pending_template_expansions
;
53 tree current_template_parms
;
54 HOST_WIDE_INT processing_template_decl
;
56 tree pending_templates
;
57 static tree
*template_tail
= &pending_templates
;
60 static tree
*maybe_template_tail
= &maybe_templates
;
62 int minimal_parse_mode
;
64 int processing_specialization
;
65 int processing_explicit_instantiation
;
66 int processing_template_parmlist
;
67 static int template_header_count
;
69 static tree saved_trees
;
71 #define obstack_chunk_alloc xmalloc
72 #define obstack_chunk_free free
74 #define UNIFY_ALLOW_NONE 0
75 #define UNIFY_ALLOW_MORE_CV_QUAL 1
76 #define UNIFY_ALLOW_LESS_CV_QUAL 2
77 #define UNIFY_ALLOW_DERIVED 4
79 static int unify
PROTO((tree
, tree
, tree
, tree
, int, int*));
80 static void add_pending_template
PROTO((tree
));
81 static int push_tinst_level
PROTO((tree
));
82 static tree classtype_mangled_name
PROTO((tree
));
83 static char *mangle_class_name_for_template
PROTO((char *, tree
, tree
));
84 static tree tsubst_expr_values
PROTO((tree
, tree
));
85 static int list_eq
PROTO((tree
, tree
));
86 static tree get_class_bindings
PROTO((tree
, tree
, tree
));
87 static tree coerce_template_parms
PROTO((tree
, tree
, tree
, int, int));
88 static void tsubst_enum
PROTO((tree
, tree
, tree
));
89 static tree add_to_template_args
PROTO((tree
, tree
));
90 static tree add_outermost_template_args
PROTO((tree
, tree
));
91 static void maybe_adjust_types_for_deduction
PROTO((unification_kind_t
, tree
*,
93 static int type_unification_real
PROTO((tree
, tree
, tree
, tree
,
94 int, unification_kind_t
, int, int*));
95 static void note_template_header
PROTO((int));
96 static tree maybe_fold_nontype_arg
PROTO((tree
));
97 static tree convert_nontype_argument
PROTO((tree
, tree
));
98 static tree get_bindings_overload
PROTO((tree
, tree
, tree
));
99 static int for_each_template_parm
PROTO((tree
, tree_fn_t
, void*));
100 static tree build_template_parm_index
PROTO((int, int, int, tree
, tree
));
101 static int inline_needs_template_parms
PROTO((tree
));
102 static void push_inline_template_parms_recursive
PROTO((tree
, int));
103 static tree retrieve_specialization
PROTO((tree
, tree
));
104 static tree register_specialization
PROTO((tree
, tree
, tree
));
105 static int unregister_specialization
PROTO((tree
, tree
));
106 static void print_candidates
PROTO((tree
));
107 static tree reduce_template_parm_level
PROTO((tree
, tree
, int));
108 static tree build_template_decl
PROTO((tree
, tree
));
109 static int mark_template_parm
PROTO((tree
, void *));
110 static tree tsubst_friend_function
PROTO((tree
, tree
));
111 static tree tsubst_friend_class
PROTO((tree
, tree
));
112 static tree get_bindings_real
PROTO((tree
, tree
, tree
, int));
113 static int template_decl_level
PROTO((tree
));
114 static tree maybe_get_template_decl_from_type_decl
PROTO((tree
));
115 static int check_cv_quals_for_unify
PROTO((int, tree
, tree
));
116 static tree tsubst_template_arg_vector
PROTO((tree
, tree
));
117 static tree tsubst_template_parms
PROTO((tree
, tree
));
118 static void regenerate_decl_from_template
PROTO((tree
, tree
));
119 static int is_member_template_class
PROTO((tree
));
120 static tree most_specialized
PROTO((tree
, tree
, tree
));
121 static tree most_specialized_class
PROTO((tree
, tree
));
122 static tree most_general_template
PROTO((tree
));
123 static void set_mangled_name_for_template_decl
PROTO((tree
));
124 static int template_class_depth_real
PROTO((tree
, int));
125 static tree tsubst_aggr_type
PROTO((tree
, tree
, tree
, int));
126 static tree tsubst_decl
PROTO((tree
, tree
, tree
, tree
));
128 /* We use TREE_VECs to hold template arguments. If there is only one
129 level of template arguments, then the TREE_VEC contains the
130 arguments directly. If there is more than one level of template
131 arguments, then each entry in the TREE_VEC is itself a TREE_VEC,
132 containing the template arguments for a single level. The first
133 entry in the outer TREE_VEC is the outermost level of template
134 parameters; the last is the innermost.
136 It is incorrect to ever form a template argument vector containing
137 only one level of arguments, but which is a TREE_VEC containing as
138 its only entry the TREE_VEC for that level. */
140 /* Non-zero if the template arguments is actually a vector of vectors,
141 rather than just a vector. */
142 #define TMPL_ARGS_HAVE_MULTIPLE_LEVELS(NODE) \
144 && TREE_CODE (NODE) == TREE_VEC \
145 && TREE_VEC_LENGTH (NODE) > 0 \
146 && TREE_VEC_ELT (NODE, 0) != NULL_TREE \
147 && TREE_CODE (TREE_VEC_ELT (NODE, 0)) == TREE_VEC)
149 /* The depth of a template argument vector. When called directly by
150 the parser, we use a TREE_LIST rather than a TREE_VEC to represent
151 template arguments. In fact, we may even see NULL_TREE if there
152 are no template arguments. In both of those cases, there is only
153 one level of template arguments. */
154 #define TMPL_ARGS_DEPTH(NODE) \
155 (TMPL_ARGS_HAVE_MULTIPLE_LEVELS (NODE) ? TREE_VEC_LENGTH (NODE) : 1)
157 /* The LEVELth level of the template ARGS. Note that template
158 parameter levels are indexed from 1, not from 0. */
159 #define TMPL_ARGS_LEVEL(ARGS, LEVEL) \
160 (TMPL_ARGS_HAVE_MULTIPLE_LEVELS (ARGS) \
161 ? TREE_VEC_ELT ((ARGS), (LEVEL) - 1) : ARGS)
163 /* Set the LEVELth level of the template ARGS to VAL. This macro does
164 not work with single-level argument vectors. */
165 #define SET_TMPL_ARGS_LEVEL(ARGS, LEVEL, VAL) \
166 (TREE_VEC_ELT ((ARGS), (LEVEL) - 1) = (VAL))
168 /* Accesses the IDXth parameter in the LEVELth level of the ARGS. */
169 #define TMPL_ARG(ARGS, LEVEL, IDX) \
170 (TREE_VEC_ELT (TMPL_ARGS_LEVEL (ARGS, LEVEL), IDX))
172 /* Set the IDXth element in the LEVELth level of ARGS to VAL. This
173 macro does not work with single-level argument vectors. */
174 #define SET_TMPL_ARG(ARGS, LEVEL, IDX, VAL) \
175 (TREE_VEC_ELT (TREE_VEC_ELT ((ARGS), (LEVEL) - 1), (IDX)) = (VAL))
177 /* Given a single level of template arguments in NODE, return the
178 number of arguments. */
179 #define NUM_TMPL_ARGS(NODE) \
180 ((NODE) == NULL_TREE ? 0 \
181 : (TREE_CODE (NODE) == TREE_VEC \
182 ? TREE_VEC_LENGTH (NODE) : list_length (NODE)))
184 /* The number of levels of template parameters given by NODE. */
185 #define TMPL_PARMS_DEPTH(NODE) \
186 (TREE_INT_CST_HIGH (TREE_PURPOSE (NODE)))
188 /* Do any processing required when DECL (a member template declaration
189 using TEMPLATE_PARAMETERS as its innermost parameter list) is
190 finished. Returns the TEMPLATE_DECL corresponding to DECL, unless
191 it is a specialization, in which case the DECL itself is returned. */
194 finish_member_template_decl (template_parameters
, decl
)
195 tree template_parameters
;
198 finish_template_decl (template_parameters
);
200 if (decl
== NULL_TREE
|| decl
== void_type_node
)
202 else if (TREE_CODE (decl
) == TREE_LIST
)
204 /* Assume that the class is the only declspec. */
205 decl
= TREE_VALUE (decl
);
206 if (IS_AGGR_TYPE (decl
) && CLASSTYPE_TEMPLATE_INFO (decl
)
207 && ! CLASSTYPE_TEMPLATE_SPECIALIZATION (decl
))
209 tree tmpl
= CLASSTYPE_TI_TEMPLATE (decl
);
210 check_member_template (tmpl
);
215 else if (DECL_TEMPLATE_INFO (decl
))
217 if (!DECL_TEMPLATE_SPECIALIZATION (decl
))
219 check_member_template (DECL_TI_TEMPLATE (decl
));
220 return DECL_TI_TEMPLATE (decl
);
226 cp_error ("invalid member template declaration `%D'", decl
);
229 return error_mark_node
;
232 /* Returns the template nesting level of the indicated class TYPE.
242 A<T>::B<U> has depth two, while A<T> has depth one.
243 Both A<T>::B<int> and A<int>::B<U> have depth one, if
244 COUNT_SPECIALIZATIONS is 0 or if they are instantiations, not
247 This function is guaranteed to return 0 if passed NULL_TREE so
248 that, for example, `template_class_depth (current_class_type)' is
252 template_class_depth_real (type
, count_specializations
)
254 int count_specializations
;
259 type
&& TREE_CODE (type
) != NAMESPACE_DECL
;
260 type
= (TREE_CODE (type
) == FUNCTION_DECL
)
261 ? DECL_REAL_CONTEXT (type
) : TYPE_CONTEXT (type
))
263 if (TREE_CODE (type
) != FUNCTION_DECL
)
265 if (CLASSTYPE_TEMPLATE_INFO (type
)
266 && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (type
))
267 && ((count_specializations
268 && CLASSTYPE_TEMPLATE_SPECIALIZATION (type
))
269 || uses_template_parms (CLASSTYPE_TI_ARGS (type
))))
274 if (DECL_TEMPLATE_INFO (type
)
275 && PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (type
))
276 && ((count_specializations
277 && DECL_TEMPLATE_SPECIALIZATION (type
))
278 || uses_template_parms (DECL_TI_ARGS (type
))))
286 /* Returns the template nesting level of the indicated class TYPE.
287 Like template_class_depth_real, but instantiations do not count in
291 template_class_depth (type
)
294 return template_class_depth_real (type
, /*count_specializations=*/0);
297 /* Returns 1 if processing DECL as part of do_pending_inlines
298 needs us to push template parms. */
301 inline_needs_template_parms (decl
)
304 if (! DECL_TEMPLATE_INFO (decl
))
307 return (TMPL_PARMS_DEPTH (DECL_TEMPLATE_PARMS (most_general_template (decl
)))
308 > (processing_template_decl
+ DECL_TEMPLATE_SPECIALIZATION (decl
)));
311 /* Subroutine of maybe_begin_member_template_processing.
312 Push the template parms in PARMS, starting from LEVELS steps into the
313 chain, and ending at the beginning, since template parms are listed
317 push_inline_template_parms_recursive (parmlist
, levels
)
321 tree parms
= TREE_VALUE (parmlist
);
325 push_inline_template_parms_recursive (TREE_CHAIN (parmlist
), levels
- 1);
327 ++processing_template_decl
;
328 current_template_parms
329 = tree_cons (build_int_2 (0, processing_template_decl
),
330 parms
, current_template_parms
);
331 TEMPLATE_PARMS_FOR_INLINE (current_template_parms
) = 1;
334 for (i
= 0; i
< TREE_VEC_LENGTH (parms
); ++i
)
336 tree parm
= TREE_VALUE (TREE_VEC_ELT (parms
, i
));
337 my_friendly_assert (TREE_CODE_CLASS (TREE_CODE (parm
)) == 'd', 0);
339 switch (TREE_CODE (parm
))
348 /* Make a CONST_DECL as is done in process_template_parm. */
349 tree decl
= build_decl (CONST_DECL
, DECL_NAME (parm
),
351 DECL_INITIAL (decl
) = DECL_INITIAL (parm
);
357 my_friendly_abort (0);
362 /* Restore the template parameter context for a member template or
363 a friend template defined in a class definition. */
366 maybe_begin_member_template_processing (decl
)
372 if (! inline_needs_template_parms (decl
))
375 parms
= DECL_TEMPLATE_PARMS (most_general_template (decl
));
377 levels
= TMPL_PARMS_DEPTH (parms
) - processing_template_decl
;
379 if (DECL_TEMPLATE_SPECIALIZATION (decl
))
382 parms
= TREE_CHAIN (parms
);
385 push_inline_template_parms_recursive (parms
, levels
);
388 /* Undo the effects of begin_member_template_processing. */
391 maybe_end_member_template_processing (decl
)
394 if (! processing_template_decl
)
397 while (current_template_parms
398 && TEMPLATE_PARMS_FOR_INLINE (current_template_parms
))
400 --processing_template_decl
;
401 current_template_parms
= TREE_CHAIN (current_template_parms
);
406 /* Returns non-zero iff T is a member template function. We must be
409 template <class T> class C { void f(); }
411 Here, f is a template function, and a member, but not a member
412 template. This function does not concern itself with the origin of
413 T, only its present state. So if we have
415 template <class T> class C { template <class U> void f(U); }
417 then neither C<int>::f<char> nor C<T>::f<double> is considered
418 to be a member template. */
421 is_member_template (t
)
424 if (TREE_CODE (t
) != FUNCTION_DECL
425 && !DECL_FUNCTION_TEMPLATE_P (t
))
426 /* Anything that isn't a function or a template function is
427 certainly not a member template. */
430 /* A local class can't have member templates. */
431 if (hack_decl_function_context (t
))
434 if ((DECL_FUNCTION_MEMBER_P (t
)
435 && !DECL_TEMPLATE_SPECIALIZATION (t
))
436 || (TREE_CODE (t
) == TEMPLATE_DECL
437 && DECL_FUNCTION_MEMBER_P (DECL_TEMPLATE_RESULT (t
))))
441 if (DECL_FUNCTION_TEMPLATE_P (t
))
443 else if (DECL_TEMPLATE_INFO (t
)
444 && DECL_FUNCTION_TEMPLATE_P (DECL_TI_TEMPLATE (t
)))
445 tmpl
= DECL_TI_TEMPLATE (t
);
450 /* If there are more levels of template parameters than
451 there are template classes surrounding the declaration,
452 then we have a member template. */
453 && (TMPL_PARMS_DEPTH (DECL_TEMPLATE_PARMS (tmpl
)) >
454 template_class_depth (DECL_CLASS_CONTEXT (t
))))
461 /* Returns non-zero iff T is a member template class. See
462 is_member_template for a description of what precisely constitutes
463 a member template. */
466 is_member_template_class (t
)
469 if (!DECL_CLASS_TEMPLATE_P (t
))
470 /* Anything that isn't a class template, is certainly not a member
474 if (!DECL_CLASS_SCOPE_P (t
))
475 /* Anything whose context isn't a class type is surely not a
479 /* If there are more levels of template parameters than there are
480 template classes surrounding the declaration, then we have a
482 return (TMPL_PARMS_DEPTH (DECL_TEMPLATE_PARMS (t
)) >
483 template_class_depth (DECL_CONTEXT (t
)));
486 /* Return a new template argument vector which contains all of ARGS,
487 but has as its innermost set of arguments the EXTRA_ARGS. The
488 resulting vector will be built on a temporary obstack, and so must
489 be explicitly copied to the permanent obstack, if required. */
492 add_to_template_args (args
, extra_args
)
501 extra_depth
= TMPL_ARGS_DEPTH (extra_args
);
502 new_args
= make_temp_vec (TMPL_ARGS_DEPTH (args
) + extra_depth
);
504 for (i
= 1; i
<= TMPL_ARGS_DEPTH (args
); ++i
)
505 SET_TMPL_ARGS_LEVEL (new_args
, i
, TMPL_ARGS_LEVEL (args
, i
));
507 for (j
= 1; j
<= extra_depth
; ++j
, ++i
)
508 SET_TMPL_ARGS_LEVEL (new_args
, i
, TMPL_ARGS_LEVEL (extra_args
, j
));
513 /* Like add_to_template_args, but only the outermost ARGS are added to
514 the EXTRA_ARGS. In particular, all but TMPL_ARGS_DEPTH
515 (EXTRA_ARGS) levels are added. This function is used to combine
516 the template arguments from a partial instantiation with the
517 template arguments used to attain the full instantiation from the
518 partial instantiation. */
521 add_outermost_template_args (args
, extra_args
)
527 /* If there are more levels of EXTRA_ARGS than there are ARGS,
528 something very fishy is going on. */
529 my_friendly_assert (TMPL_ARGS_DEPTH (args
) >= TMPL_ARGS_DEPTH (extra_args
),
532 /* If *all* the new arguments will be the EXTRA_ARGS, just return
534 if (TMPL_ARGS_DEPTH (args
) == TMPL_ARGS_DEPTH (extra_args
))
537 /* For the moment, we make ARGS look like it contains fewer levels. */
538 TREE_VEC_LENGTH (args
) -= TMPL_ARGS_DEPTH (extra_args
);
540 new_args
= add_to_template_args (args
, extra_args
);
542 /* Now, we restore ARGS to its full dimensions. */
543 TREE_VEC_LENGTH (args
) += TMPL_ARGS_DEPTH (extra_args
);
548 /* We've got a template header coming up; push to a new level for storing
552 begin_template_parm_list ()
554 /* We use a non-tag-transparent scope here, which causes pushtag to
555 put tags in this scope, rather than in the enclosing class or
556 namespace scope. This is the right thing, since we want
557 TEMPLATE_DECLS, and not TYPE_DECLS for template classes. For a
558 global template class, push_template_decl handles putting the
559 TEMPLATE_DECL into top-level scope. For a nested template class,
562 template <class T> struct S1 {
563 template <class T> struct S2 {};
566 pushtag contains special code to call pushdecl_with_scope on the
567 TEMPLATE_DECL for S2. */
569 declare_pseudo_global_level ();
570 ++processing_template_decl
;
571 ++processing_template_parmlist
;
572 note_template_header (0);
575 /* We've just seen template <>. */
578 begin_specialization ()
580 note_template_header (1);
583 /* Called at then end of processing a declaration preceeded by
587 end_specialization ()
589 reset_specialization ();
592 /* Any template <>'s that we have seen thus far are not referring to a
593 function specialization. */
596 reset_specialization ()
598 processing_specialization
= 0;
599 template_header_count
= 0;
602 /* We've just seen a template header. If SPECIALIZATION is non-zero,
603 it was of the form template <>. */
606 note_template_header (specialization
)
609 processing_specialization
= specialization
;
610 template_header_count
++;
613 /* We're beginning an explicit instantiation. */
616 begin_explicit_instantiation ()
618 ++processing_explicit_instantiation
;
623 end_explicit_instantiation ()
625 my_friendly_assert(processing_explicit_instantiation
> 0, 0);
626 --processing_explicit_instantiation
;
629 /* The TYPE is being declared. If it is a template type, that means it
630 is a partial specialization. Do appropriate error-checking. */
633 maybe_process_partial_specialization (type
)
636 if (IS_AGGR_TYPE (type
) && CLASSTYPE_USE_TEMPLATE (type
))
638 if (CLASSTYPE_IMPLICIT_INSTANTIATION (type
)
639 && TYPE_SIZE (type
) == NULL_TREE
)
641 SET_CLASSTYPE_TEMPLATE_SPECIALIZATION (type
);
642 if (processing_template_decl
)
643 push_template_decl (TYPE_MAIN_DECL (type
));
645 else if (CLASSTYPE_TEMPLATE_INSTANTIATION (type
))
646 cp_error ("specialization of `%T' after instantiation", type
);
650 /* Retrieve the specialization (in the sense of [temp.spec] - a
651 specialization is either an instantiation or an explicit
652 specialization) of TMPL for the given template ARGS. If there is
653 no such specialization, return NULL_TREE. The ARGS are a vector of
654 arguments, or a vector of vectors of arguments, in the case of
655 templates with more than one level of parameters. */
658 retrieve_specialization (tmpl
, args
)
664 my_friendly_assert (TREE_CODE (tmpl
) == TEMPLATE_DECL
, 0);
666 /* There should be as many levels of arguments as there are
667 levels of parameters. */
668 my_friendly_assert (TMPL_ARGS_DEPTH (args
)
669 == TMPL_PARMS_DEPTH (DECL_TEMPLATE_PARMS (tmpl
)),
672 for (s
= DECL_TEMPLATE_SPECIALIZATIONS (tmpl
);
675 if (comp_template_args (TREE_PURPOSE (s
), args
))
676 return TREE_VALUE (s
);
681 /* Returns non-zero iff DECL is a specialization of TMPL. */
684 is_specialization_of (decl
, tmpl
)
690 if (TREE_CODE (decl
) == FUNCTION_DECL
)
694 t
= DECL_TEMPLATE_INFO (t
) ? DECL_TI_TEMPLATE (t
) : NULL_TREE
)
700 my_friendly_assert (TREE_CODE (decl
) == TYPE_DECL
, 0);
702 for (t
= TREE_TYPE (decl
);
704 t
= CLASSTYPE_USE_TEMPLATE (t
)
705 ? TREE_TYPE (CLASSTYPE_TI_TEMPLATE (t
)) : NULL_TREE
)
706 if (comptypes (TYPE_MAIN_VARIANT (t
),
707 TYPE_MAIN_VARIANT (TREE_TYPE (tmpl
)), 1))
714 /* Register the specialization SPEC as a specialization of TMPL with
715 the indicated ARGS. Returns SPEC, or an equivalent prior
716 declaration, if available. */
719 register_specialization (spec
, tmpl
, args
)
726 my_friendly_assert (TREE_CODE (tmpl
) == TEMPLATE_DECL
, 0);
728 if (TREE_CODE (spec
) == FUNCTION_DECL
729 && uses_template_parms (DECL_TI_ARGS (spec
)))
730 /* This is the FUNCTION_DECL for a partial instantiation. Don't
731 register it; we want the corresponding TEMPLATE_DECL instead.
732 We use `uses_template_parms (DECL_TI_ARGS (spec))' rather than
733 the more obvious `uses_template_parms (spec)' to avoid problems
734 with default function arguments. In particular, given
737 template <class T> void f(T t1, T t = T())
739 the default argument expression is not substituted for in an
740 instantiation unless and until it is actually needed. */
743 /* There should be as many levels of arguments as there are
744 levels of parameters. */
745 my_friendly_assert (TMPL_ARGS_DEPTH (args
)
746 == TMPL_PARMS_DEPTH (DECL_TEMPLATE_PARMS (tmpl
)),
749 for (s
= DECL_TEMPLATE_SPECIALIZATIONS (tmpl
);
752 if (comp_template_args (TREE_PURPOSE (s
), args
))
754 tree fn
= TREE_VALUE (s
);
756 if (DECL_TEMPLATE_SPECIALIZATION (spec
))
758 if (DECL_TEMPLATE_INSTANTIATION (fn
))
761 || DECL_EXPLICIT_INSTANTIATION (fn
))
763 cp_error ("specialization of %D after instantiation",
769 /* This situation should occur only if the first
770 specialization is an implicit instantiation,
771 the second is an explicit specialization, and
772 the implicit instantiation has not yet been
773 used. That situation can occur if we have
774 implicitly instantiated a member function and
775 then specialized it later.
777 We can also wind up here if a friend
778 declaration that looked like an instantiation
779 turns out to be a specialization:
781 template <class T> void foo(T);
782 class S { friend void foo<>(int) };
783 template <> void foo(int);
785 We transform the existing DECL in place so that
786 any pointers to it become pointers to the
787 updated declaration. */
788 duplicate_decls (spec
, TREE_VALUE (s
));
789 return TREE_VALUE (s
);
792 else if (DECL_TEMPLATE_SPECIALIZATION (fn
))
794 duplicate_decls (spec
, TREE_VALUE (s
));
795 return TREE_VALUE (s
);
800 DECL_TEMPLATE_SPECIALIZATIONS (tmpl
)
801 = perm_tree_cons (args
, spec
, DECL_TEMPLATE_SPECIALIZATIONS (tmpl
));
806 /* Unregister the specialization SPEC as a specialization of TMPL.
807 Returns nonzero if the SPEC was listed as a specialization of
811 unregister_specialization (spec
, tmpl
)
817 for (s
= &DECL_TEMPLATE_SPECIALIZATIONS (tmpl
);
819 s
= &TREE_CHAIN (*s
))
820 if (TREE_VALUE (*s
) == spec
)
822 *s
= TREE_CHAIN (*s
);
829 /* Print the list of candidate FNS in an error message. */
832 print_candidates (fns
)
837 char* str
= "candidates are:";
839 for (fn
= fns
; fn
!= NULL_TREE
; fn
= TREE_CHAIN (fn
))
841 cp_error_at ("%s %+#D", str
, TREE_VALUE (fn
));
846 /* Returns the template (one of the functions given by TEMPLATE_ID)
847 which can be specialized to match the indicated DECL with the
848 explicit template args given in TEMPLATE_ID. If
849 NEED_MEMBER_TEMPLATE is true the function is a specialization of a
850 member template. The template args (those explicitly specified and
851 those deduced) are output in a newly created vector *TARGS_OUT. If
852 it is impossible to determine the result, an error message is
853 issued, unless COMPLAIN is 0. The DECL may be NULL_TREE if none is
857 determine_specialization (template_id
, decl
, targs_out
,
858 need_member_template
,
863 int need_member_template
;
867 tree templates
= NULL_TREE
;
871 *targs_out
= NULL_TREE
;
873 if (template_id
== error_mark_node
)
874 return error_mark_node
;
876 fns
= TREE_OPERAND (template_id
, 0);
877 targs_in
= TREE_OPERAND (template_id
, 1);
879 if (fns
== error_mark_node
)
880 return error_mark_node
;
882 /* Check for baselinks. */
883 if (TREE_CODE (fns
) == TREE_LIST
)
884 fns
= TREE_VALUE (fns
);
886 for (; fns
; fns
= OVL_NEXT (fns
))
890 fn
= OVL_CURRENT (fns
);
891 if (!need_member_template
892 && TREE_CODE (fn
) == FUNCTION_DECL
893 && DECL_FUNCTION_MEMBER_P (fn
)
894 && DECL_USE_TEMPLATE (fn
)
895 && DECL_TI_TEMPLATE (fn
))
896 /* We can get here when processing something like:
897 template <class T> class X { void f(); }
898 template <> void X<int>::f() {}
899 We're specializing a member function, but not a member
901 tmpl
= DECL_TI_TEMPLATE (fn
);
902 else if (TREE_CODE (fn
) != TEMPLATE_DECL
903 || (need_member_template
&& !is_member_template (fn
)))
908 if (list_length (targs_in
) > DECL_NTPARMS (tmpl
))
911 if (decl
== NULL_TREE
)
913 tree targs
= make_scratch_vec (DECL_NTPARMS (tmpl
));
915 /* We allow incomplete unification here, because we are going to
916 check all the functions. */
917 i
= type_unification (DECL_INNERMOST_TEMPLATE_PARMS (tmpl
),
925 /* Unification was successful. */
926 templates
= scratch_tree_cons (targs
, tmpl
, templates
);
929 templates
= scratch_tree_cons (NULL_TREE
, tmpl
, templates
);
932 if (decl
!= NULL_TREE
)
934 tree tmpl
= most_specialized (templates
, decl
, targs_in
);
938 if (tmpl
== error_mark_node
)
940 else if (tmpl
== NULL_TREE
)
943 inner_args
= get_bindings (tmpl
, decl
, targs_in
);
944 tmpl_args
= DECL_TI_ARGS (DECL_RESULT (tmpl
));
945 if (TMPL_ARGS_HAVE_MULTIPLE_LEVELS (tmpl_args
))
947 *targs_out
= copy_node (tmpl_args
);
948 SET_TMPL_ARGS_LEVEL (*targs_out
,
949 TMPL_ARGS_DEPTH (*targs_out
),
953 *targs_out
= inner_args
;
958 if (templates
== NULL_TREE
)
963 cp_error_at ("template-id `%D' for `%+D' does not match any template declaration",
965 return error_mark_node
;
969 else if (TREE_CHAIN (templates
) != NULL_TREE
)
974 cp_error_at ("ambiguous template specialization `%D' for `%+D'",
976 print_candidates (templates
);
977 return error_mark_node
;
982 /* We have one, and exactly one, match. */
983 *targs_out
= TREE_PURPOSE (templates
);
984 return TREE_VALUE (templates
);
987 /* Check to see if the function just declared, as indicated in
988 DECLARATOR, and in DECL, is a specialization of a function
989 template. We may also discover that the declaration is an explicit
990 instantiation at this point.
992 Returns DECL, or an equivalent declaration that should be used
995 FLAGS is a bitmask consisting of the following flags:
997 1: We are being called by finish_struct. (We are unable to
998 determine what template is specialized by an in-class
999 declaration until the class definition is complete, so
1000 finish_struct_methods calls this function again later to finish
1002 2: The function has a definition.
1003 4: The function is a friend.
1004 8: The function is known to be a specialization of a member
1007 The TEMPLATE_COUNT is the number of references to qualifying
1008 template classes that appeared in the name of the function. For
1011 template <class T> struct S { void f(); };
1014 the TEMPLATE_COUNT would be 1. However, explicitly specialized
1015 classes are not counted in the TEMPLATE_COUNT, so that in
1017 template <class T> struct S {};
1018 template <> struct S<int> { void f(); }
1019 template <> void S<int>::f();
1021 the TEMPLATE_COUNT would be 0. (Note that this declaration is
1022 illegal; there should be no template <>.)
1024 If the function is a specialization, it is marked as such via
1025 DECL_TEMPLATE_SPECIALIZATION. Furthermore, its DECL_TEMPLATE_INFO
1026 is set up correctly, and it is added to the list of specializations
1027 for that template. */
1030 check_explicit_specialization (declarator
, decl
, template_count
, flags
)
1036 int finish_member
= flags
& 1;
1037 int have_def
= flags
& 2;
1038 int is_friend
= flags
& 4;
1039 int specialization
= 0;
1040 int explicit_instantiation
= 0;
1041 int member_specialization
= flags
& 8;
1043 tree ctype
= DECL_CLASS_CONTEXT (decl
);
1044 tree dname
= DECL_NAME (decl
);
1048 if (processing_specialization
)
1050 /* The last template header was of the form template <>. */
1052 if (template_header_count
> template_count
)
1054 /* There were more template headers than qualifying template
1056 if (template_header_count
- template_count
> 1)
1057 /* There shouldn't be that many template parameter
1058 lists. There can be at most one parameter list for
1059 every qualifying class, plus one for the function
1061 cp_error ("too many template parameter lists in declaration of `%D'", decl
);
1063 SET_DECL_TEMPLATE_SPECIALIZATION (decl
);
1065 member_specialization
= 1;
1069 else if (template_header_count
== template_count
)
1071 /* The counts are equal. So, this might be a
1072 specialization, but it is not a specialization of a
1073 member template. It might be something like
1075 template <class T> struct S {
1079 void S<int>::f(int i) {} */
1081 SET_DECL_TEMPLATE_SPECIALIZATION (decl
);
1085 /* This cannot be an explicit specialization. There are not
1086 enough headers for all of the qualifying classes. For
1087 example, we might have:
1090 void S<int>::T<char>::f();
1092 But, we're missing another template <>. */
1093 cp_error("too few template parameter lists in declaration of `%D'", decl
);
1097 else if (processing_explicit_instantiation
)
1099 if (template_header_count
)
1100 cp_error ("template parameter list used in explicit instantiation");
1103 cp_error ("definition provided for explicit instantiation");
1105 explicit_instantiation
= 1;
1107 else if (ctype
!= NULL_TREE
1108 && !TYPE_BEING_DEFINED (ctype
)
1109 && CLASSTYPE_TEMPLATE_INSTANTIATION (ctype
)
1112 /* This case catches outdated code that looks like this:
1114 template <class T> struct S { void f(); };
1115 void S<int>::f() {} // Missing template <>
1117 We disable this check when the type is being defined to
1118 avoid complaining about default compiler-generated
1119 constructors, destructors, and assignment operators.
1120 Since the type is an instantiation, not a specialization,
1121 these are the only functions that can be defined before
1122 the class is complete. */
1125 template <class T> void S<int>::f() {}
1127 if (template_header_count
)
1129 cp_error ("template parameters specified in specialization");
1135 ("explicit specialization not preceded by `template <>'");
1137 SET_DECL_TEMPLATE_SPECIALIZATION (decl
);
1139 else if (TREE_CODE (declarator
) == TEMPLATE_ID_EXPR
)
1142 /* This could be something like:
1144 template <class T> void f(T);
1145 class S { friend void f<>(int); } */
1149 /* This case handles bogus declarations like template <>
1150 template <class T> void f<int>(); */
1152 cp_error ("template-id `%D' in declaration of primary template",
1159 if (specialization
|| member_specialization
)
1161 tree t
= TYPE_ARG_TYPES (TREE_TYPE (decl
));
1162 for (; t
; t
= TREE_CHAIN (t
))
1163 if (TREE_PURPOSE (t
))
1166 ("default argument specified in explicit specialization");
1171 if (specialization
|| member_specialization
|| explicit_instantiation
)
1174 tree tmpl
= NULL_TREE
;
1175 tree targs
= NULL_TREE
;
1177 /* Make sure that the declarator is a TEMPLATE_ID_EXPR. */
1178 if (TREE_CODE (declarator
) != TEMPLATE_ID_EXPR
)
1182 my_friendly_assert (TREE_CODE (declarator
) == IDENTIFIER_NODE
,
1185 fns
= IDENTIFIER_NAMESPACE_VALUE (dname
);
1190 lookup_template_function (fns
, NULL_TREE
);
1193 if (declarator
== error_mark_node
)
1194 return error_mark_node
;
1196 if (TREE_CODE (TREE_OPERAND (declarator
, 0)) == LOOKUP_EXPR
)
1198 /* A friend declaration. We can't do much, because we don't
1199 know what this resolves to, yet. */
1200 my_friendly_assert (is_friend
!= 0, 0);
1201 my_friendly_assert (!explicit_instantiation
, 0);
1202 SET_DECL_IMPLICIT_INSTANTIATION (decl
);
1206 if (ctype
!= NULL_TREE
&& TYPE_BEING_DEFINED (ctype
))
1208 if (!explicit_instantiation
)
1210 /* Since finish_struct_1 has not been called yet, we
1211 can't call lookup_fnfields. We note that this
1212 template is a specialization, and proceed, letting
1213 finish_struct fix this up later. */
1214 tree ti
= perm_tree_cons (NULL_TREE
,
1215 TREE_OPERAND (declarator
, 1),
1217 TI_PENDING_SPECIALIZATION_FLAG (ti
) = 1;
1218 DECL_TEMPLATE_INFO (decl
) = ti
;
1221 /* It's not legal to write an explicit instantiation in
1224 class C { template void f(); }
1226 This case is caught by the parser. However, on
1229 template class C { void f(); };
1231 (which is illegal) we can get here. The error will be
1237 else if (ctype
!= NULL_TREE
1238 && (TREE_CODE (TREE_OPERAND (declarator
, 0)) ==
1241 /* Find the list of functions in ctype that have the same
1242 name as the declared function. */
1243 tree name
= TREE_OPERAND (declarator
, 0);
1246 if (name
== constructor_name (ctype
)
1247 || name
== constructor_name_full (ctype
))
1249 int is_constructor
= DECL_CONSTRUCTOR_P (decl
);
1251 if (is_constructor
? !TYPE_HAS_CONSTRUCTOR (ctype
)
1252 : !TYPE_HAS_DESTRUCTOR (ctype
))
1254 /* From [temp.expl.spec]:
1256 If such an explicit specialization for the member
1257 of a class template names an implicitly-declared
1258 special member function (clause _special_), the
1259 program is ill-formed.
1261 Similar language is found in [temp.explicit]. */
1262 cp_error ("specialization of implicitly-declared special member function");
1267 name
= is_constructor
? ctor_identifier
: dtor_identifier
;
1270 fns
= lookup_fnfields (TYPE_BINFO (ctype
), name
, 1);
1272 if (fns
== NULL_TREE
)
1274 cp_error ("no member function `%s' declared in `%T'",
1275 IDENTIFIER_POINTER (name
),
1280 TREE_OPERAND (declarator
, 0) = fns
;
1283 /* Figure out what exactly is being specialized at this point.
1284 Note that for an explicit instantiation, even one for a
1285 member function, we cannot tell apriori whether the
1286 instantiation is for a member template, or just a member
1287 function of a template class. Even if a member template is
1288 being instantiated, the member template arguments may be
1289 elided if they can be deduced from the rest of the
1291 tmpl
= determine_specialization (declarator
, decl
,
1293 member_specialization
,
1296 if (tmpl
&& tmpl
!= error_mark_node
)
1298 gen_tmpl
= most_general_template (tmpl
);
1300 if (explicit_instantiation
)
1302 /* We don't set DECL_EXPLICIT_INSTANTIATION here; that
1303 is done by do_decl_instantiation later. */
1304 decl
= instantiate_template (tmpl
, innermost_args (targs
));
1308 /* If we though that the DECL was a member function, but it
1309 turns out to be specializing a static member function,
1310 make DECL a static member function as well. */
1311 if (DECL_STATIC_FUNCTION_P (tmpl
)
1312 && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl
))
1314 revert_static_member_fn (&decl
, 0, 0);
1315 last_function_parms
= TREE_CHAIN (last_function_parms
);
1318 /* Set up the DECL_TEMPLATE_INFO for DECL. */
1319 DECL_TEMPLATE_INFO (decl
)
1320 = perm_tree_cons (tmpl
, targs
, NULL_TREE
);
1322 /* Mangle the function name appropriately. Note that we do
1323 not mangle specializations of non-template member
1324 functions of template classes, e.g. with
1326 template <class T> struct S { void f(); }
1328 and given the specialization
1330 template <> void S<int>::f() {}
1332 we do not mangle S<int>::f() here. That's because it's
1333 just an ordinary member function and doesn't need special
1334 treatment. We do this here so that the ordinary,
1335 non-template, name-mangling algorith will not be used
1337 if ((is_member_template (tmpl
) || ctype
== NULL_TREE
)
1338 && name_mangling_version
>= 1)
1339 set_mangled_name_for_template_decl (decl
);
1341 if (is_friend
&& !have_def
)
1342 /* This is not really a declaration of a specialization.
1343 It's just the name of an instantiation. But, it's not
1344 a request for an instantiation, either. */
1345 SET_DECL_IMPLICIT_INSTANTIATION (decl
);
1347 /* Register this specialization so that we can find it
1349 decl
= register_specialization (decl
, gen_tmpl
, targs
);
1358 /* TYPE is being declared. Verify that the use of template headers
1359 and such is reasonable. Issue error messages if not. */
1362 maybe_check_template_type (type
)
1365 if (template_header_count
)
1367 /* We are in the scope of some `template <...>' header. */
1370 = template_class_depth_real (TYPE_CONTEXT (type
),
1371 /*count_specializations=*/1);
1373 if (template_header_count
<= context_depth
)
1374 /* This is OK; the template headers are for the context. We
1375 are actually too lenient here; like
1376 check_explicit_specialization we should consider the number
1377 of template types included in the actual declaration. For
1380 template <class T> struct S {
1381 template <class U> template <class V>
1387 template <class T> struct S {
1388 template <class U> struct I;
1391 template <class T> template <class U.
1396 else if (template_header_count
> context_depth
+ 1)
1397 /* There are two many template parameter lists. */
1398 cp_error ("too many template parameter lists in declaration of `%T'", type
);
1402 /* Returns 1 iff PARMS1 and PARMS2 are identical sets of template
1403 parameters. These are represented in the same format used for
1404 DECL_TEMPLATE_PARMS. */
1406 int comp_template_parms (parms1
, parms2
)
1413 if (parms1
== parms2
)
1416 for (p1
= parms1
, p2
= parms2
;
1417 p1
!= NULL_TREE
&& p2
!= NULL_TREE
;
1418 p1
= TREE_CHAIN (p1
), p2
= TREE_CHAIN (p2
))
1420 tree t1
= TREE_VALUE (p1
);
1421 tree t2
= TREE_VALUE (p2
);
1424 my_friendly_assert (TREE_CODE (t1
) == TREE_VEC
, 0);
1425 my_friendly_assert (TREE_CODE (t2
) == TREE_VEC
, 0);
1427 if (TREE_VEC_LENGTH (t1
) != TREE_VEC_LENGTH (t2
))
1430 for (i
= 0; i
< TREE_VEC_LENGTH (t2
); ++i
)
1432 tree parm1
= TREE_VALUE (TREE_VEC_ELT (t1
, i
));
1433 tree parm2
= TREE_VALUE (TREE_VEC_ELT (t2
, i
));
1435 if (TREE_CODE (parm1
) != TREE_CODE (parm2
))
1438 if (TREE_CODE (parm1
) == TEMPLATE_TYPE_PARM
)
1440 else if (!comptypes (TREE_TYPE (parm1
),
1441 TREE_TYPE (parm2
), 1))
1446 if ((p1
!= NULL_TREE
) != (p2
!= NULL_TREE
))
1447 /* One set of parameters has more parameters lists than the
1455 /* Returns 1 iff old_id is a template parameter. OLD_DECL is the decl
1456 from IDENTIFIER_LOCAL_VALUE (new identifier). */
1458 int decl_template_parm_p (old_decl
)
1461 if (TREE_CODE_CLASS (TREE_CODE (old_decl
)) == 'd'
1462 /* For template type parameters. */
1463 && ((TREE_TYPE (old_decl
)
1464 && TREE_CODE (TREE_TYPE (old_decl
)) == TEMPLATE_TYPE_PARM
)
1465 /* For non-type template parameters. */
1466 || (DECL_INITIAL (old_decl
)
1467 && TREE_CODE (DECL_INITIAL (old_decl
)) == TEMPLATE_PARM_INDEX
)))
1474 /* Return a new TEMPLATE_PARM_INDEX with the indicated INDEX, LEVEL,
1475 ORIG_LEVEL, DECL, and TYPE. */
1478 build_template_parm_index (index
, level
, orig_level
, decl
, type
)
1485 tree t
= make_node (TEMPLATE_PARM_INDEX
);
1486 TEMPLATE_PARM_IDX (t
) = index
;
1487 TEMPLATE_PARM_LEVEL (t
) = level
;
1488 TEMPLATE_PARM_ORIG_LEVEL (t
) = orig_level
;
1489 TEMPLATE_PARM_DECL (t
) = decl
;
1490 TREE_TYPE (t
) = type
;
1495 /* Return a TEMPLATE_PARM_INDEX, similar to INDEX, but whose
1496 TEMPLATE_PARM_LEVEL has been decreased by LEVELS. If such a
1497 TEMPLATE_PARM_INDEX already exists, it is returned; otherwise, a
1498 new one is created. */
1501 reduce_template_parm_level (index
, type
, levels
)
1506 if (TEMPLATE_PARM_DESCENDANTS (index
) == NULL_TREE
1507 || (TEMPLATE_PARM_LEVEL (TEMPLATE_PARM_DESCENDANTS (index
))
1508 != TEMPLATE_PARM_LEVEL (index
) - levels
))
1511 = build_decl (TREE_CODE (TEMPLATE_PARM_DECL (index
)),
1512 DECL_NAME (TEMPLATE_PARM_DECL (index
)),
1515 = build_template_parm_index (TEMPLATE_PARM_IDX (index
),
1516 TEMPLATE_PARM_LEVEL (index
) - levels
,
1517 TEMPLATE_PARM_ORIG_LEVEL (index
),
1519 TEMPLATE_PARM_DESCENDANTS (index
) = t
;
1521 /* Template template parameters need this. */
1522 DECL_TEMPLATE_PARMS (decl
)
1523 = DECL_TEMPLATE_PARMS (TEMPLATE_PARM_DECL (index
));
1526 return TEMPLATE_PARM_DESCENDANTS (index
);
1529 /* Process information from new template parameter NEXT and append it to the
1530 LIST being built. */
1533 process_template_parm (list
, next
)
1542 my_friendly_assert (TREE_CODE (parm
) == TREE_LIST
, 259);
1543 defval
= TREE_PURPOSE (parm
);
1544 parm
= TREE_VALUE (parm
);
1545 is_type
= TREE_PURPOSE (parm
) == class_type_node
;
1549 tree p
= TREE_VALUE (tree_last (list
));
1551 if (TREE_CODE (p
) == TYPE_DECL
)
1552 idx
= TEMPLATE_TYPE_IDX (TREE_TYPE (p
));
1553 else if (TREE_CODE (p
) == TEMPLATE_DECL
)
1554 idx
= TEMPLATE_TYPE_IDX (TREE_TYPE (DECL_TEMPLATE_RESULT (p
)));
1556 idx
= TEMPLATE_PARM_IDX (DECL_INITIAL (p
));
1564 my_friendly_assert (TREE_CODE (TREE_PURPOSE (parm
)) == TREE_LIST
, 260);
1565 /* is a const-param */
1566 parm
= grokdeclarator (TREE_VALUE (parm
), TREE_PURPOSE (parm
),
1567 PARM
, 0, NULL_TREE
);
1568 /* A template parameter is not modifiable. */
1569 TREE_READONLY (parm
) = 1;
1570 if (IS_AGGR_TYPE (TREE_TYPE (parm
))
1571 && TREE_CODE (TREE_TYPE (parm
)) != TEMPLATE_TYPE_PARM
1572 && TREE_CODE (TREE_TYPE (parm
)) != TYPENAME_TYPE
)
1574 cp_error ("`%#T' is not a valid type for a template constant parameter",
1576 if (DECL_NAME (parm
) == NULL_TREE
)
1577 error (" a template type parameter must begin with `class' or `typename'");
1578 TREE_TYPE (parm
) = void_type_node
;
1581 && (TREE_CODE (TREE_TYPE (parm
)) == REAL_TYPE
1582 || TREE_CODE (TREE_TYPE (parm
)) == COMPLEX_TYPE
))
1583 cp_pedwarn ("`%T' is not a valid type for a template constant parameter",
1585 if (TREE_PERMANENT (parm
) == 0)
1587 parm
= copy_node (parm
);
1588 TREE_PERMANENT (parm
) = 1;
1590 decl
= build_decl (CONST_DECL
, DECL_NAME (parm
), TREE_TYPE (parm
));
1591 DECL_INITIAL (parm
) = DECL_INITIAL (decl
)
1592 = build_template_parm_index (idx
, processing_template_decl
,
1593 processing_template_decl
,
1594 decl
, TREE_TYPE (parm
));
1599 parm
= TREE_VALUE (parm
);
1601 if (parm
&& TREE_CODE (parm
) == TEMPLATE_DECL
)
1603 t
= make_lang_type (TEMPLATE_TEMPLATE_PARM
);
1604 /* This is for distinguishing between real templates and template
1605 template parameters */
1606 TREE_TYPE (parm
) = t
;
1607 TREE_TYPE (DECL_TEMPLATE_RESULT (parm
)) = t
;
1612 t
= make_lang_type (TEMPLATE_TYPE_PARM
);
1613 /* parm is either IDENTIFIER_NODE or NULL_TREE */
1614 decl
= build_decl (TYPE_DECL
, parm
, t
);
1617 CLASSTYPE_GOT_SEMICOLON (t
) = 1;
1618 TYPE_NAME (t
) = decl
;
1619 TYPE_STUB_DECL (t
) = decl
;
1621 TEMPLATE_TYPE_PARM_INDEX (t
)
1622 = build_template_parm_index (idx
, processing_template_decl
,
1623 processing_template_decl
,
1624 decl
, TREE_TYPE (parm
));
1626 SET_DECL_ARTIFICIAL (decl
);
1628 parm
= build_tree_list (defval
, parm
);
1629 return chainon (list
, parm
);
1632 /* The end of a template parameter list has been reached. Process the
1633 tree list into a parameter vector, converting each parameter into a more
1634 useful form. Type parameters are saved as IDENTIFIER_NODEs, and others
1638 end_template_parm_list (parms
)
1643 tree saved_parmlist
= make_tree_vec (list_length (parms
));
1645 current_template_parms
1646 = tree_cons (build_int_2 (0, processing_template_decl
),
1647 saved_parmlist
, current_template_parms
);
1649 for (parm
= parms
, nparms
= 0; parm
; parm
= TREE_CHAIN (parm
), nparms
++)
1650 TREE_VEC_ELT (saved_parmlist
, nparms
) = parm
;
1652 --processing_template_parmlist
;
1654 return saved_parmlist
;
1657 /* end_template_decl is called after a template declaration is seen. */
1660 end_template_decl ()
1662 reset_specialization ();
1664 if (! processing_template_decl
)
1667 /* This matches the pushlevel in begin_template_parm_list. */
1670 --processing_template_decl
;
1671 current_template_parms
= TREE_CHAIN (current_template_parms
);
1672 (void) get_pending_sizes (); /* Why? */
1675 /* Given a template argument vector containing the template PARMS.
1676 The innermost PARMS are given first. */
1679 current_template_args ()
1683 int length
= TMPL_PARMS_DEPTH (current_template_parms
);
1686 /* If there is only one level of template parameters, we do not
1687 create a TREE_VEC of TREE_VECs. Instead, we return a single
1688 TREE_VEC containing the arguments. */
1690 args
= make_tree_vec (length
);
1692 for (header
= current_template_parms
; header
; header
= TREE_CHAIN (header
))
1694 tree a
= copy_node (TREE_VALUE (header
));
1697 TREE_TYPE (a
) = NULL_TREE
;
1698 for (i
= TREE_VEC_LENGTH (a
) - 1; i
>= 0; --i
)
1700 tree t
= TREE_VEC_ELT (a
, i
);
1702 /* T will be a list if we are called from within a
1703 begin/end_template_parm_list pair, but a vector directly
1704 if within a begin/end_member_template_processing pair. */
1705 if (TREE_CODE (t
) == TREE_LIST
)
1709 if (TREE_CODE (t
) == TYPE_DECL
1710 || TREE_CODE (t
) == TEMPLATE_DECL
)
1713 t
= DECL_INITIAL (t
);
1714 TREE_VEC_ELT (a
, i
) = t
;
1719 TREE_VEC_ELT (args
, --l
) = a
;
1727 /* Return a TEMPLATE_DECL corresponding to DECL, using the indicated
1728 template PARMS. Used by push_template_decl below. */
1731 build_template_decl (decl
, parms
)
1735 tree tmpl
= build_lang_decl (TEMPLATE_DECL
, DECL_NAME (decl
), NULL_TREE
);
1736 DECL_TEMPLATE_PARMS (tmpl
) = parms
;
1737 DECL_CONTEXT (tmpl
) = DECL_CONTEXT (decl
);
1738 if (DECL_LANG_SPECIFIC (decl
))
1740 DECL_CLASS_CONTEXT (tmpl
) = DECL_CLASS_CONTEXT (decl
);
1741 DECL_STATIC_FUNCTION_P (tmpl
) =
1742 DECL_STATIC_FUNCTION_P (decl
);
1748 struct template_parm_data
1754 /* Subroutine of push_template_decl used to see if each template
1755 parameter in a partial specialization is used in the explicit
1756 argument list. If T is of the LEVEL given in DATA (which is
1757 treated as a template_parm_data*), then DATA->PARMS is marked
1761 mark_template_parm (t
, data
)
1767 struct template_parm_data
* tpd
= (struct template_parm_data
*) data
;
1769 if (TREE_CODE (t
) == TEMPLATE_PARM_INDEX
)
1771 level
= TEMPLATE_PARM_LEVEL (t
);
1772 idx
= TEMPLATE_PARM_IDX (t
);
1776 level
= TEMPLATE_TYPE_LEVEL (t
);
1777 idx
= TEMPLATE_TYPE_IDX (t
);
1780 if (level
== tpd
->level
)
1781 tpd
->parms
[idx
] = 1;
1783 /* Return zero so that for_each_template_parm will continue the
1784 traversal of the tree; we want to mark *every* template parm. */
1788 /* Creates a TEMPLATE_DECL for the indicated DECL using the template
1789 parameters given by current_template_args, or reuses a
1790 previously existing one, if appropriate. Returns the DECL, or an
1791 equivalent one, if it is replaced via a call to duplicate_decls.
1793 If IS_FRIEND is non-zero, DECL is a friend declaration. */
1796 push_template_decl_real (decl
, is_friend
)
1806 is_friend
|= (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_FRIEND_P (decl
));
1809 /* For a friend, we want the context of the friend function, not
1810 the type of which it is a friend. */
1811 ctx
= DECL_CONTEXT (decl
);
1812 else if (DECL_REAL_CONTEXT (decl
)
1813 && TREE_CODE (DECL_REAL_CONTEXT (decl
)) != NAMESPACE_DECL
)
1814 /* In the case of a virtual function, we want the class in which
1816 ctx
= DECL_REAL_CONTEXT (decl
);
1818 /* Otherwise, if we're currently definining some class, the DECL
1819 is assumed to be a member of the class. */
1820 ctx
= current_class_type
;
1822 if (ctx
&& TREE_CODE (ctx
) == NAMESPACE_DECL
)
1825 if (!DECL_CONTEXT (decl
))
1826 DECL_CONTEXT (decl
) = FROB_CONTEXT (current_namespace
);
1828 /* For determining whether this is a primary template or not, we're really
1829 interested in the lexical context, not the true context. */
1831 info
= current_class_type
;
1835 if (info
&& TREE_CODE (info
) == FUNCTION_DECL
)
1837 /* Note that template_class_depth returns 0 if given NULL_TREE, so
1838 this next line works even when we are at global scope. */
1839 else if (processing_template_decl
> template_class_depth (info
))
1846 if (current_lang_name
== lang_name_c
)
1847 cp_error ("template with C linkage");
1848 if (TREE_CODE (decl
) == TYPE_DECL
&& ANON_AGGRNAME_P (DECL_NAME (decl
)))
1849 cp_error ("template class without a name");
1850 if (TREE_CODE (decl
) == TYPE_DECL
1851 && TREE_CODE (TREE_TYPE (decl
)) == ENUMERAL_TYPE
)
1852 cp_error ("template declaration of `%#T'", TREE_TYPE (decl
));
1855 /* Partial specialization. */
1856 if (TREE_CODE (decl
) == TYPE_DECL
&& DECL_ARTIFICIAL (decl
)
1857 && TREE_CODE (TREE_TYPE (decl
)) != ENUMERAL_TYPE
1858 && CLASSTYPE_TEMPLATE_SPECIALIZATION (TREE_TYPE (decl
)))
1860 tree type
= TREE_TYPE (decl
);
1861 tree maintmpl
= CLASSTYPE_TI_TEMPLATE (type
);
1862 tree specargs
= CLASSTYPE_TI_ARGS (type
);
1864 /* We check that each of the template parameters given in the
1865 partial specialization is used in the argument list to the
1866 specialization. For example:
1868 template <class T> struct S;
1869 template <class T> struct S<T*>;
1871 The second declaration is OK because `T*' uses the template
1872 parameter T, whereas
1874 template <class T> struct S<int>;
1876 is no good. Even trickier is:
1887 The S2<T> declaration is actually illegal; it is a
1888 full-specialization. Of course,
1891 struct S2<T (*)(U)>;
1893 or some such would have been OK. */
1895 struct template_parm_data tpd
;
1897 = TREE_VEC_LENGTH (INNERMOST_TEMPLATE_PARMS (current_template_parms
));
1898 int did_error_intro
= 0;
1900 tpd
.level
= TMPL_PARMS_DEPTH (current_template_parms
);
1901 tpd
.parms
= alloca (sizeof (int) * ntparms
);
1902 for (i
= 0; i
< ntparms
; ++i
)
1904 for (i
= 0; i
< TREE_VEC_LENGTH (specargs
); ++i
)
1905 for_each_template_parm (TREE_VEC_ELT (specargs
, i
),
1906 &mark_template_parm
,
1908 for (i
= 0; i
< ntparms
; ++i
)
1909 if (tpd
.parms
[i
] == 0)
1911 /* One of the template parms was not used in the
1913 if (!did_error_intro
)
1915 cp_error ("template parameters not used in partial specialization:");
1916 did_error_intro
= 1;
1920 TREE_VALUE (TREE_VEC_ELT
1921 (TREE_VALUE (current_template_parms
),
1925 /* [temp.class.spec]
1927 The argument list of the specialization shall not be
1928 identical to the implicit argument list of the primary
1930 if (comp_template_args (specargs
,
1931 CLASSTYPE_TI_ARGS (TREE_TYPE (maintmpl
))))
1932 cp_error ("partial specialization `%T' does not specialize any template arguments", type
);
1934 if (retrieve_specialization (maintmpl
, specargs
))
1935 /* We've already got this specialization. */
1938 DECL_TEMPLATE_SPECIALIZATIONS (maintmpl
) = CLASSTYPE_TI_SPEC_INFO (type
)
1939 = perm_tree_cons (innermost_args (specargs
),
1940 INNERMOST_TEMPLATE_PARMS (current_template_parms
),
1941 DECL_TEMPLATE_SPECIALIZATIONS (maintmpl
));
1942 TREE_TYPE (DECL_TEMPLATE_SPECIALIZATIONS (maintmpl
)) = type
;
1946 args
= current_template_args ();
1949 || TREE_CODE (ctx
) == FUNCTION_DECL
1950 || TYPE_BEING_DEFINED (ctx
)
1951 || (is_friend
&& !DECL_TEMPLATE_INFO (decl
)))
1953 if (DECL_LANG_SPECIFIC (decl
)
1954 && DECL_TEMPLATE_INFO (decl
)
1955 && DECL_TI_TEMPLATE (decl
))
1956 tmpl
= DECL_TI_TEMPLATE (decl
);
1959 tmpl
= build_template_decl (decl
, current_template_parms
);
1961 if (DECL_LANG_SPECIFIC (decl
)
1962 && DECL_TEMPLATE_SPECIALIZATION (decl
))
1964 /* A specialization of a member template of a template
1966 SET_DECL_TEMPLATE_SPECIALIZATION (tmpl
);
1967 DECL_TEMPLATE_INFO (tmpl
) = DECL_TEMPLATE_INFO (decl
);
1968 DECL_TEMPLATE_INFO (decl
) = NULL_TREE
;
1977 if (CLASSTYPE_TEMPLATE_INSTANTIATION (ctx
))
1978 cp_error ("must specialize `%#T' before defining member `%#D'",
1980 if (TREE_CODE (decl
) == TYPE_DECL
)
1982 if ((IS_AGGR_TYPE_CODE (TREE_CODE (TREE_TYPE (decl
)))
1983 || TREE_CODE (TREE_TYPE (decl
)) == ENUMERAL_TYPE
)
1984 && TYPE_TEMPLATE_INFO (TREE_TYPE (decl
))
1985 && TYPE_TI_TEMPLATE (TREE_TYPE (decl
)))
1986 tmpl
= TYPE_TI_TEMPLATE (TREE_TYPE (decl
));
1989 cp_error ("`%D' does not declare a template type", decl
);
1993 else if (! DECL_TEMPLATE_INFO (decl
))
1995 cp_error ("template definition of non-template `%#D'", decl
);
1999 tmpl
= DECL_TI_TEMPLATE (decl
);
2001 if (is_member_template (tmpl
) || is_member_template_class (tmpl
))
2003 if (DECL_FUNCTION_TEMPLATE_P (tmpl
)
2004 && DECL_TEMPLATE_INFO (decl
) && DECL_TI_ARGS (decl
)
2005 && DECL_TEMPLATE_SPECIALIZATION (decl
))
2009 /* The declaration is a specialization of a member
2010 template, declared outside the class. Therefore, the
2011 innermost template arguments will be NULL, so we
2012 replace them with the arguments determined by the
2013 earlier call to check_explicit_specialization. */
2014 args
= DECL_TI_ARGS (decl
);
2017 = build_template_decl (decl
, current_template_parms
);
2018 DECL_TEMPLATE_RESULT (new_tmpl
) = decl
;
2019 TREE_TYPE (new_tmpl
) = TREE_TYPE (decl
);
2020 DECL_TI_TEMPLATE (decl
) = new_tmpl
;
2021 SET_DECL_TEMPLATE_SPECIALIZATION (new_tmpl
);
2022 DECL_TEMPLATE_INFO (new_tmpl
) =
2023 perm_tree_cons (tmpl
, args
, NULL_TREE
);
2025 register_specialization (new_tmpl
, tmpl
, args
);
2029 a
= innermost_args (args
);
2030 t
= DECL_INNERMOST_TEMPLATE_PARMS (tmpl
);
2031 if (TREE_VEC_LENGTH (t
) != TREE_VEC_LENGTH (a
))
2033 cp_error ("got %d template parameters for `%#D'",
2034 TREE_VEC_LENGTH (a
), decl
);
2035 cp_error (" but %d required", TREE_VEC_LENGTH (t
));
2037 if (TMPL_ARGS_DEPTH (args
) > 1)
2038 /* Get the template parameters for the enclosing template
2040 a
= TMPL_ARGS_LEVEL (args
, TMPL_ARGS_DEPTH (args
) - 1);
2045 a
= innermost_args (args
);
2049 if (CLASSTYPE_TEMPLATE_SPECIALIZATION (ctx
))
2051 /* When processing an inline member template of a
2052 specialized class, there is no CLASSTYPE_TI_SPEC_INFO. */
2053 if (CLASSTYPE_TI_SPEC_INFO (ctx
))
2054 t
= TREE_VALUE (CLASSTYPE_TI_SPEC_INFO (ctx
));
2056 else if (CLASSTYPE_TEMPLATE_INFO (ctx
))
2057 t
= DECL_INNERMOST_TEMPLATE_PARMS (CLASSTYPE_TI_TEMPLATE (ctx
));
2059 /* There should be template arguments if and only if there is a
2061 my_friendly_assert((a
!= NULL_TREE
) == (t
!= NULL_TREE
), 0);
2064 && TREE_VEC_LENGTH (t
) != TREE_VEC_LENGTH (a
))
2066 cp_error ("got %d template parameters for `%#D'",
2067 TREE_VEC_LENGTH (a
), decl
);
2068 cp_error (" but `%#T' has %d", ctx
, TREE_VEC_LENGTH (t
));
2072 DECL_TEMPLATE_RESULT (tmpl
) = decl
;
2073 TREE_TYPE (tmpl
) = TREE_TYPE (decl
);
2075 /* Push template declarations for global functions and types. Note
2076 that we do not try to push a global template friend declared in a
2077 template class; such a thing may well depend on the template
2078 parameters of the class. */
2080 && !(is_friend
&& template_class_depth (current_class_type
) > 0))
2081 tmpl
= pushdecl_namespace_level (tmpl
);
2084 DECL_PRIMARY_TEMPLATE (tmpl
) = tmpl
;
2086 info
= perm_tree_cons (tmpl
, args
, NULL_TREE
);
2088 if (TREE_CODE (decl
) == TYPE_DECL
&& DECL_ARTIFICIAL (decl
))
2090 SET_TYPE_TEMPLATE_INFO (TREE_TYPE (tmpl
), info
);
2091 if ((!ctx
|| TREE_CODE (ctx
) != FUNCTION_DECL
)
2092 && TREE_CODE (TREE_TYPE (decl
)) != ENUMERAL_TYPE
)
2093 DECL_NAME (decl
) = classtype_mangled_name (TREE_TYPE (decl
));
2095 else if (! DECL_LANG_SPECIFIC (decl
))
2096 cp_error ("template declaration of `%#D'", decl
);
2098 DECL_TEMPLATE_INFO (decl
) = info
;
2100 return DECL_TEMPLATE_RESULT (tmpl
);
2104 push_template_decl (decl
)
2107 return push_template_decl_real (decl
, 0);
2110 /* Called when a class template TYPE is redeclared with the indicated
2111 template PARMS, e.g.:
2113 template <class T> struct S;
2114 template <class T> struct S {}; */
2117 redeclare_class_template (type
, parms
)
2121 tree tmpl
= CLASSTYPE_TI_TEMPLATE (type
);
2125 if (!PRIMARY_TEMPLATE_P (tmpl
))
2126 /* The type is nested in some template class. Nothing to worry
2127 about here; there are no new template parameters for the nested
2131 parms
= INNERMOST_TEMPLATE_PARMS (parms
);
2132 tmpl_parms
= DECL_INNERMOST_TEMPLATE_PARMS (tmpl
);
2134 if (TREE_VEC_LENGTH (parms
) != TREE_VEC_LENGTH (tmpl_parms
))
2136 cp_error_at ("previous declaration `%D'", tmpl
);
2137 cp_error ("used %d template parameter%s instead of %d",
2138 TREE_VEC_LENGTH (tmpl_parms
),
2139 TREE_VEC_LENGTH (tmpl_parms
) == 1 ? "" : "s",
2140 TREE_VEC_LENGTH (parms
));
2144 for (i
= 0; i
< TREE_VEC_LENGTH (tmpl_parms
); ++i
)
2146 tree tmpl_parm
= TREE_VALUE (TREE_VEC_ELT (tmpl_parms
, i
));
2147 tree parm
= TREE_VALUE (TREE_VEC_ELT (parms
, i
));
2148 tree tmpl_default
= TREE_PURPOSE (TREE_VEC_ELT (tmpl_parms
, i
));
2149 tree parm_default
= TREE_PURPOSE (TREE_VEC_ELT (parms
, i
));
2151 if (TREE_CODE (tmpl_parm
) != TREE_CODE (parm
))
2153 cp_error_at ("template parameter `%#D'", tmpl_parm
);
2154 cp_error ("redeclared here as `%#D'", parm
);
2158 if (tmpl_default
!= NULL_TREE
&& parm_default
!= NULL_TREE
)
2160 /* We have in [temp.param]:
2162 A template-parameter may not be given default arguments
2163 by two different declarations in the same scope. */
2164 cp_error ("redefinition of default argument for `%#D'", parm
);
2165 cp_error_at (" original definition appeared here", tmpl_parm
);
2169 if (parm_default
!= NULL_TREE
)
2170 /* Update the previous template parameters (which are the ones
2171 that will really count) with the new default value. */
2172 TREE_PURPOSE (TREE_VEC_ELT (tmpl_parms
, i
)) = parm_default
;
2176 /* Attempt to convert the non-type template parameter EXPR to the
2177 indicated TYPE. If the conversion is successful, return the
2178 converted value. If the conversion is unsuccesful, return
2179 NULL_TREE if we issued an error message, or error_mark_node if we
2180 did not. We issue error messages for out-and-out bad template
2181 parameters, but not simply because the conversion failed, since we
2182 might be just trying to do argument deduction. By the time this
2183 function is called, neither TYPE nor EXPR may make use of template
2187 convert_nontype_argument (type
, expr
)
2191 tree expr_type
= TREE_TYPE (expr
);
2193 /* A template-argument for a non-type, non-template
2194 template-parameter shall be one of:
2196 --an integral constant-expression of integral or enumeration
2199 --the name of a non-type template-parameter; or
2201 --the name of an object or function with external linkage,
2202 including function templates and function template-ids but
2203 excluding non-static class members, expressed as id-expression;
2206 --the address of an object or function with external linkage,
2207 including function templates and function template-ids but
2208 excluding non-static class members, expressed as & id-expression
2209 where the & is optional if the name refers to a function or
2212 --a pointer to member expressed as described in _expr.unary.op_. */
2214 /* An integral constant-expression can include const variables
2216 if (INTEGRAL_TYPE_P (expr_type
) && TREE_READONLY_DECL_P (expr
))
2217 expr
= decl_constant_value (expr
);
2219 if (is_overloaded_fn (expr
))
2220 /* OK for now. We'll check that it has external linkage later.
2221 Check this first since if expr_type is the unknown_type_node
2222 we would otherwise complain below. */
2224 else if (INTEGRAL_TYPE_P (expr_type
)
2225 || TYPE_PTRMEM_P (expr_type
)
2226 || TYPE_PTRMEMFUNC_P (expr_type
)
2227 /* The next two are g++ extensions. */
2228 || TREE_CODE (expr_type
) == REAL_TYPE
2229 || TREE_CODE (expr_type
) == COMPLEX_TYPE
)
2231 if (! TREE_CONSTANT (expr
))
2234 cp_error ("non-constant `%E' cannot be used as template argument",
2239 else if (TYPE_PTR_P (expr_type
)
2240 /* If expr is the address of an overloaded function, we
2241 will get the unknown_type_node at this point. */
2242 || expr_type
== unknown_type_node
)
2248 if (TREE_CODE (e
) != ADDR_EXPR
)
2251 cp_error ("`%E' is not a valid template argument", expr
);
2252 error ("it must be %s%s with external linkage",
2253 TREE_CODE (TREE_TYPE (expr
)) == POINTER_TYPE
2254 ? "a pointer to " : "",
2255 TREE_CODE (TREE_TYPE (TREE_TYPE (expr
))) == FUNCTION_TYPE
2256 ? "a function" : "an object");
2260 referent
= TREE_OPERAND (e
, 0);
2261 STRIP_NOPS (referent
);
2263 if (TREE_CODE (referent
) == STRING_CST
)
2265 cp_error ("string literal %E is not a valid template argument",
2267 error ("because it is the address of an object with static linkage");
2271 if (is_overloaded_fn (referent
))
2272 /* We'll check that it has external linkage later. */
2274 else if (TREE_CODE (referent
) != VAR_DECL
)
2276 else if (!TREE_PUBLIC (referent
))
2278 cp_error ("address of non-extern `%E' cannot be used as template argument", referent
);
2279 return error_mark_node
;
2282 else if (TREE_CODE (expr
) == VAR_DECL
)
2284 if (!TREE_PUBLIC (expr
))
2289 cp_error ("object `%E' cannot be used as template argument", expr
);
2293 switch (TREE_CODE (type
))
2298 /* For a non-type template-parameter of integral or enumeration
2299 type, integral promotions (_conv.prom_) and integral
2300 conversions (_conv.integral_) are applied. */
2301 if (!INTEGRAL_TYPE_P (expr_type
))
2302 return error_mark_node
;
2304 /* It's safe to call digest_init in this case; we know we're
2305 just converting one integral constant expression to another. */
2306 expr
= digest_init (type
, expr
, (tree
*) 0);
2308 if (TREE_CODE (expr
) != INTEGER_CST
)
2309 /* Curiously, some TREE_CONSTNAT integral expressions do not
2310 simplify to integer constants. For example, `3 % 0',
2311 remains a TRUNC_MOD_EXPR. */
2318 /* These are g++ extensions. */
2319 if (TREE_CODE (expr_type
) != TREE_CODE (type
))
2320 return error_mark_node
;
2322 expr
= digest_init (type
, expr
, (tree
*) 0);
2324 if (TREE_CODE (expr
) != REAL_CST
)
2331 tree type_pointed_to
= TREE_TYPE (type
);
2333 if (TYPE_PTRMEM_P (type
))
2334 /* For a non-type template-parameter of type pointer to data
2335 member, qualification conversions (_conv.qual_) are
2337 return perform_qualification_conversions (type
, expr
);
2338 else if (TREE_CODE (type_pointed_to
) == FUNCTION_TYPE
)
2340 /* For a non-type template-parameter of type pointer to
2341 function, only the function-to-pointer conversion
2342 (_conv.func_) is applied. If the template-argument
2343 represents a set of overloaded functions (or a pointer to
2344 such), the matching function is selected from the set
2349 if (TREE_CODE (expr
) == ADDR_EXPR
)
2350 fns
= TREE_OPERAND (expr
, 0);
2354 fn
= instantiate_type (type_pointed_to
, fns
, 0);
2356 if (fn
== error_mark_node
)
2357 return error_mark_node
;
2359 if (!TREE_PUBLIC (fn
))
2361 if (really_overloaded_fn (fns
))
2362 return error_mark_node
;
2367 expr
= build_unary_op (ADDR_EXPR
, fn
, 0);
2369 my_friendly_assert (comptypes (type
, TREE_TYPE (expr
), 1),
2375 /* For a non-type template-parameter of type pointer to
2376 object, qualification conversions (_conv.qual_) and the
2377 array-to-pointer conversion (_conv.array_) are applied.
2378 [Note: In particular, neither the null pointer conversion
2379 (_conv.ptr_) nor the derived-to-base conversion
2380 (_conv.ptr_) are applied. Although 0 is a valid
2381 template-argument for a non-type template-parameter of
2382 integral type, it is not a valid template-argument for a
2383 non-type template-parameter of pointer type.]
2385 The call to decay_conversion performs the
2386 array-to-pointer conversion, if appropriate. */
2387 expr
= decay_conversion (expr
);
2389 if (expr
== error_mark_node
)
2390 return error_mark_node
;
2392 return perform_qualification_conversions (type
, expr
);
2397 case REFERENCE_TYPE
:
2399 tree type_referred_to
= TREE_TYPE (type
);
2401 if (TREE_CODE (type_referred_to
) == FUNCTION_TYPE
)
2403 /* For a non-type template-parameter of type reference to
2404 function, no conversions apply. If the
2405 template-argument represents a set of overloaded
2406 functions, the matching function is selected from the
2407 set (_over.over_). */
2411 fn
= instantiate_type (type_referred_to
, fns
, 0);
2413 if (!TREE_PUBLIC (fn
))
2415 if (really_overloaded_fn (fns
))
2416 /* Don't issue an error here; we might get a different
2417 function if the overloading had worked out
2419 return error_mark_node
;
2424 if (fn
== error_mark_node
)
2425 return error_mark_node
;
2427 my_friendly_assert (comptypes (type
, TREE_TYPE (fn
), 1),
2434 /* For a non-type template-parameter of type reference to
2435 object, no conversions apply. The type referred to by the
2436 reference may be more cv-qualified than the (otherwise
2437 identical) type of the template-argument. The
2438 template-parameter is bound directly to the
2439 template-argument, which must be an lvalue. */
2440 if (!comptypes (TYPE_MAIN_VARIANT (expr_type
),
2441 TYPE_MAIN_VARIANT (type
), 1)
2442 || (TYPE_READONLY (expr_type
) >
2443 TYPE_READONLY (type_referred_to
))
2444 || (TYPE_VOLATILE (expr_type
) >
2445 TYPE_VOLATILE (type_referred_to
))
2446 || !real_lvalue_p (expr
))
2447 return error_mark_node
;
2459 if (!TYPE_PTRMEMFUNC_P (type
))
2460 /* This handles templates like
2461 template<class T, T t> void f();
2462 when T is substituted with any class. The second template
2463 parameter becomes invalid and the template candidate is
2465 return error_mark_node
;
2467 /* For a non-type template-parameter of type pointer to member
2468 function, no conversions apply. If the template-argument
2469 represents a set of overloaded member functions, the
2470 matching member function is selected from the set
2473 if (!TYPE_PTRMEMFUNC_P (expr_type
) &&
2474 expr_type
!= unknown_type_node
)
2475 return error_mark_node
;
2477 if (TREE_CODE (expr
) == CONSTRUCTOR
)
2479 /* A ptr-to-member constant. */
2480 if (!comptypes (type
, expr_type
, 1))
2481 return error_mark_node
;
2486 if (TREE_CODE (expr
) != ADDR_EXPR
)
2487 return error_mark_node
;
2489 fns
= TREE_OPERAND (expr
, 0);
2491 fn
= instantiate_type (TREE_TYPE (TREE_TYPE (type
)),
2494 if (fn
== error_mark_node
)
2495 return error_mark_node
;
2497 expr
= build_unary_op (ADDR_EXPR
, fn
, 0);
2499 my_friendly_assert (comptypes (type
, TREE_TYPE (expr
), 1),
2506 /* All non-type parameters must have one of these types. */
2507 my_friendly_abort (0);
2511 return error_mark_node
;
2514 /* Return 1 if PARM_PARMS and ARG_PARMS matches using rule for
2515 template template parameters. Both PARM_PARMS and ARG_PARMS are
2516 vectors of TREE_LIST nodes containing TYPE_DECL, TEMPLATE_DECL
2519 ARG_PARMS may contain more parameters than PARM_PARMS. If this is
2520 the case, then extra parameters must have default arguments.
2522 Consider the example:
2523 template <class T, class Allocator = allocator> class vector;
2524 template<template <class U> class TT> class C;
2526 C<vector> is a valid instantiation. PARM_PARMS for the above code
2527 contains a TYPE_DECL (for U), ARG_PARMS contains two TYPE_DECLs (for
2528 T and Allocator) and OUTER_ARGS contains the argument that is used to
2529 substitute the TT parameter. */
2532 coerce_template_template_parms (parm_parms
, arg_parms
, in_decl
, outer_args
)
2533 tree parm_parms
, arg_parms
, in_decl
, outer_args
;
2535 int nparms
, nargs
, i
;
2538 my_friendly_assert (TREE_CODE (parm_parms
) == TREE_VEC
, 0);
2539 my_friendly_assert (TREE_CODE (arg_parms
) == TREE_VEC
, 0);
2541 nparms
= TREE_VEC_LENGTH (parm_parms
);
2542 nargs
= TREE_VEC_LENGTH (arg_parms
);
2544 /* The rule here is opposite of coerce_template_parms. */
2547 && TREE_PURPOSE (TREE_VEC_ELT (arg_parms
, nparms
)) == NULL_TREE
))
2550 for (i
= 0; i
< nparms
; ++i
)
2552 parm
= TREE_VALUE (TREE_VEC_ELT (parm_parms
, i
));
2553 arg
= TREE_VALUE (TREE_VEC_ELT (arg_parms
, i
));
2555 if (arg
== NULL_TREE
|| arg
== error_mark_node
2556 || parm
== NULL_TREE
|| parm
== error_mark_node
)
2559 if (TREE_CODE (arg
) != TREE_CODE (parm
))
2562 switch (TREE_CODE (parm
))
2568 /* We encounter instantiations of templates like
2569 template <template <template <class> class> class TT>
2571 sorry ("nested template template parameter");
2575 /* The tsubst call is used to handle cases such as
2576 template <class T, template <T> class TT> class D;
2577 i.e. the parameter list of TT depends on earlier parameters. */
2578 if (!comptypes (tsubst (TREE_TYPE (parm
), outer_args
, in_decl
),
2579 TREE_TYPE (arg
), 1))
2584 my_friendly_abort (0);
2590 /* Convert all template arguments to their appropriate types, and return
2591 a vector containing the resulting values. If any error occurs, return
2592 error_mark_node, and, if COMPLAIN is non-zero, issue an error message.
2593 Some error messages are issued even if COMPLAIN is zero; for
2594 instance, if a template argument is composed from a local class.
2596 If REQUIRE_ALL_ARGUMENTS is non-zero, all arguments must be
2597 provided in ARGLIST, or else trailing parameters must have default
2598 values. If REQUIRE_ALL_ARGUMENTS is zero, we will attempt argument
2599 deduction for any unspecified trailing arguments. */
2602 coerce_template_parms (parms
, arglist
, in_decl
,
2604 require_all_arguments
)
2605 tree parms
, arglist
;
2608 int require_all_arguments
;
2610 int nparms
, nargs
, i
, lost
= 0;
2614 inner_args
= innermost_args (arglist
);
2615 nargs
= NUM_TMPL_ARGS (inner_args
);
2616 nparms
= TREE_VEC_LENGTH (parms
);
2620 && require_all_arguments
2621 && TREE_PURPOSE (TREE_VEC_ELT (parms
, nargs
)) == NULL_TREE
))
2625 cp_error ("wrong number of template arguments (%d, should be %d)",
2629 cp_error_at ("provided for `%D'", in_decl
);
2632 return error_mark_node
;
2635 /* Create in VEC the appropriate innermost arguments, and reset
2636 ARGLIST to contain the complete set of arguments. */
2637 if (inner_args
&& TREE_CODE (inner_args
) == TREE_VEC
&& nargs
== nparms
)
2639 /* If we already have all the arguments, we can just use them.
2640 This is an optimization over the code in the `else' branch
2641 below, and should be functionally identicial. */
2642 vec
= copy_node (inner_args
);
2643 arglist
= add_outermost_template_args (arglist
, vec
);
2647 /* If we don't already have all the arguments we must get what
2648 we can from default template arguments. The tricky bit is
2649 that previous arguments can influence the default values,
2652 template <class T, class U = T> void foo();
2654 If we see `foo<int>' we have to come up with an {int, int}
2659 vec
= make_tree_vec (nparms
);
2660 new_arglist
= add_outermost_template_args (arglist
, vec
);
2662 for (i
= 0; i
< nparms
; i
++)
2665 tree parm
= TREE_VEC_ELT (parms
, i
);
2667 if (arglist
&& TREE_CODE (arglist
) == TREE_LIST
)
2670 arglist
= TREE_CHAIN (arglist
);
2672 if (arg
== error_mark_node
)
2675 arg
= TREE_VALUE (arg
);
2679 arg
= TREE_VEC_ELT (inner_args
, i
);
2680 if (arg
== error_mark_node
)
2683 /* If no template argument was supplied, look for a default
2685 else if (TREE_PURPOSE (parm
) == NULL_TREE
)
2687 /* There was no default value. */
2688 my_friendly_assert (!require_all_arguments
, 0);
2691 else if (TREE_CODE (TREE_VALUE (parm
)) == TYPE_DECL
)
2692 arg
= tsubst (TREE_PURPOSE (parm
), new_arglist
, in_decl
);
2694 arg
= tsubst_expr (TREE_PURPOSE (parm
), new_arglist
, in_decl
);
2696 TREE_VEC_ELT (vec
, i
) = arg
;
2699 /* We've left ARGLIST intact up to this point, in order to allow
2700 iteration through it in the case that it was a TREE_LIST, but
2701 from here on it should contain the full set of template
2703 arglist
= new_arglist
;
2706 for (i
= 0; i
< nparms
; i
++)
2708 tree arg
= TREE_VEC_ELT (vec
, i
);
2709 tree parm
= TREE_VALUE (TREE_VEC_ELT (parms
, i
));
2711 int is_type
, requires_type
, is_tmpl_type
, requires_tmpl_type
;
2713 if (arg
== NULL_TREE
)
2714 /* We're out of arguments. */
2716 my_friendly_assert (!require_all_arguments
, 0);
2720 if (arg
== error_mark_node
)
2722 cp_error ("template argument %d is invalid", i
+ 1);
2727 if (TREE_CODE (arg
) == TREE_LIST
2728 && TREE_TYPE (arg
) != NULL_TREE
2729 && TREE_CODE (TREE_TYPE (arg
)) == OFFSET_TYPE
)
2731 /* The template argument was the name of some
2732 member function. That's usually
2733 illegal, but static members are OK. In any
2734 case, grab the underlying fields/functions
2735 and issue an error later if required. */
2736 arg
= TREE_VALUE (arg
);
2737 TREE_TYPE (arg
) = unknown_type_node
;
2740 requires_tmpl_type
= TREE_CODE (parm
) == TEMPLATE_DECL
;
2741 requires_type
= TREE_CODE (parm
) == TYPE_DECL
2742 || requires_tmpl_type
;
2744 /* Check if it is a class template. If REQUIRES_TMPL_TYPE is true,
2745 we also accept implicitly created TYPE_DECL as a valid argument.
2746 This is necessary to handle the case where we pass a template name
2747 to a template template parameter in a scope where we've derived from
2748 in instantiation of that template, so the template name refers to that
2749 instantiation. We really ought to handle this better. */
2750 is_tmpl_type
= (TREE_CODE (arg
) == TEMPLATE_DECL
2751 && TREE_CODE (DECL_TEMPLATE_RESULT (arg
)) == TYPE_DECL
)
2752 || (TREE_CODE (arg
) == TEMPLATE_TEMPLATE_PARM
2753 && !CLASSTYPE_TEMPLATE_INFO (arg
))
2754 || (TREE_CODE (arg
) == RECORD_TYPE
2755 && CLASSTYPE_TEMPLATE_INFO (arg
)
2756 && TREE_CODE (TYPE_NAME (arg
)) == TYPE_DECL
2757 && DECL_ARTIFICIAL (TYPE_NAME (arg
))
2758 && requires_tmpl_type
2759 && current_class_type
2760 /* FIXME what about nested types? */
2761 && get_binfo (arg
, current_class_type
, 0));
2762 if (is_tmpl_type
&& TREE_CODE (arg
) == TEMPLATE_TEMPLATE_PARM
)
2763 arg
= TYPE_STUB_DECL (arg
);
2764 else if (is_tmpl_type
&& TREE_CODE (arg
) == RECORD_TYPE
)
2765 arg
= CLASSTYPE_TI_TEMPLATE (arg
);
2767 is_type
= TREE_CODE_CLASS (TREE_CODE (arg
)) == 't' || is_tmpl_type
;
2769 if (requires_type
&& ! is_type
&& TREE_CODE (arg
) == SCOPE_REF
2770 && TREE_CODE (TREE_OPERAND (arg
, 0)) == TEMPLATE_TYPE_PARM
)
2772 cp_pedwarn ("to refer to a type member of a template parameter,");
2773 cp_pedwarn (" use `typename %E'", arg
);
2775 arg
= make_typename_type (TREE_OPERAND (arg
, 0),
2776 TREE_OPERAND (arg
, 1));
2779 if (is_type
!= requires_type
)
2785 cp_error ("type/value mismatch at argument %d in template parameter list for `%D'",
2788 cp_error (" expected a constant of type `%T', got `%T'",
2790 (is_tmpl_type
? DECL_NAME (arg
) : arg
));
2792 cp_error (" expected a type, got `%E'", arg
);
2796 TREE_VEC_ELT (vec
, i
) = error_mark_node
;
2799 if (is_tmpl_type
^ requires_tmpl_type
)
2801 if (in_decl
&& complain
)
2803 cp_error ("type/value mismatch at argument %d in template parameter list for `%D'",
2806 cp_error (" expected a type, got `%T'", DECL_NAME (arg
));
2808 cp_error (" expected a class template, got `%T'", arg
);
2811 TREE_VEC_ELT (vec
, i
) = error_mark_node
;
2817 if (requires_tmpl_type
)
2819 tree parmparm
= DECL_INNERMOST_TEMPLATE_PARMS (parm
);
2820 tree argparm
= DECL_INNERMOST_TEMPLATE_PARMS (arg
);
2822 if (coerce_template_template_parms (parmparm
, argparm
,
2827 /* TEMPLATE_TEMPLATE_PARM node is preferred over
2829 if (val
!= error_mark_node
2830 && DECL_TEMPLATE_TEMPLATE_PARM_P (val
))
2831 val
= TREE_TYPE (val
);
2835 if (in_decl
&& complain
)
2837 cp_error ("type/value mismatch at argument %d in template parameter list for `%D'",
2839 cp_error (" expected a template of type `%D', got `%D'", parm
, arg
);
2842 val
= error_mark_node
;
2847 val
= groktypename (arg
);
2848 if (! processing_template_decl
)
2850 /* [basic.link]: A name with no linkage (notably, the
2851 name of a class or enumeration declared in a local
2852 scope) shall not be used to declare an entity with
2853 linkage. This implies that names with no linkage
2854 cannot be used as template arguments. */
2855 tree t
= no_linkage_check (val
);
2858 if (ANON_AGGRNAME_P (TYPE_IDENTIFIER (t
)))
2860 ("template-argument `%T' uses anonymous type", val
);
2863 ("template-argument `%T' uses local type `%T'",
2865 return error_mark_node
;
2872 tree t
= tsubst (TREE_TYPE (parm
), arglist
, in_decl
);
2874 if (processing_template_decl
)
2875 arg
= maybe_fold_nontype_arg (arg
);
2877 if (!uses_template_parms (arg
) && !uses_template_parms (t
))
2878 /* We used to call digest_init here. However, digest_init
2879 will report errors, which we don't want when complain
2880 is zero. More importantly, digest_init will try too
2881 hard to convert things: for example, `0' should not be
2882 converted to pointer type at this point according to
2883 the standard. Accepting this is not merely an
2884 extension, since deciding whether or not these
2885 conversions can occur is part of determining which
2886 function template to call, or whether a given epxlicit
2887 argument specification is legal. */
2888 val
= convert_nontype_argument (t
, arg
);
2892 if (val
== NULL_TREE
)
2893 val
= error_mark_node
;
2894 else if (val
== error_mark_node
&& complain
)
2895 cp_error ("could not convert template argument `%E' to `%T'",
2899 if (val
== error_mark_node
)
2902 TREE_VEC_ELT (vec
, i
) = val
;
2905 return error_mark_node
;
2909 /* Renturns 1 iff the OLDARGS and NEWARGS are in fact identical sets
2910 of template arguments. Returns 0 otherwise. */
2913 comp_template_args (oldargs
, newargs
)
2914 tree oldargs
, newargs
;
2918 if (TREE_VEC_LENGTH (oldargs
) != TREE_VEC_LENGTH (newargs
))
2921 for (i
= 0; i
< TREE_VEC_LENGTH (oldargs
); ++i
)
2923 tree nt
= TREE_VEC_ELT (newargs
, i
);
2924 tree ot
= TREE_VEC_ELT (oldargs
, i
);
2928 if (TREE_CODE (nt
) != TREE_CODE (ot
))
2930 if (TREE_CODE (nt
) == TREE_VEC
)
2932 /* For member templates */
2933 if (comp_template_args (ot
, nt
))
2936 else if (TREE_CODE_CLASS (TREE_CODE (ot
)) == 't')
2938 if (comptypes (ot
, nt
, 1))
2941 else if (cp_tree_equal (ot
, nt
) > 0)
2948 /* Given class template name and parameter list, produce a user-friendly name
2949 for the instantiation. */
2952 mangle_class_name_for_template (name
, parms
, arglist
)
2954 tree parms
, arglist
;
2956 static struct obstack scratch_obstack
;
2957 static char *scratch_firstobj
;
2960 if (!scratch_firstobj
)
2961 gcc_obstack_init (&scratch_obstack
);
2963 obstack_free (&scratch_obstack
, scratch_firstobj
);
2964 scratch_firstobj
= obstack_alloc (&scratch_obstack
, 1);
2966 #define ccat(c) obstack_1grow (&scratch_obstack, (c));
2967 #define cat(s) obstack_grow (&scratch_obstack, (s), strlen (s))
2971 nparms
= TREE_VEC_LENGTH (parms
);
2972 arglist
= innermost_args (arglist
);
2973 my_friendly_assert (nparms
== TREE_VEC_LENGTH (arglist
), 268);
2974 for (i
= 0; i
< nparms
; i
++)
2976 tree parm
= TREE_VALUE (TREE_VEC_ELT (parms
, i
));
2977 tree arg
= TREE_VEC_ELT (arglist
, i
);
2982 if (TREE_CODE (parm
) == TYPE_DECL
)
2984 cat (type_as_string_real (arg
, 0, 1));
2987 else if (TREE_CODE (parm
) == TEMPLATE_DECL
)
2989 if (TREE_CODE (arg
) == TEMPLATE_DECL
)
2991 /* Already substituted with real template. Just output
2992 the template name here */
2993 tree context
= DECL_CONTEXT (arg
);
2996 my_friendly_assert (TREE_CODE (context
) == NAMESPACE_DECL
, 980422);
2997 cat(decl_as_string (DECL_CONTEXT (arg
), 0));
3000 cat (IDENTIFIER_POINTER (DECL_NAME (arg
)));
3003 /* Output the parameter declaration */
3004 cat (type_as_string_real (arg
, 0, 1));
3008 my_friendly_assert (TREE_CODE (parm
) == PARM_DECL
, 269);
3010 if (TREE_CODE (arg
) == TREE_LIST
)
3012 /* New list cell was built because old chain link was in
3014 my_friendly_assert (TREE_PURPOSE (arg
) == NULL_TREE
, 270);
3015 arg
= TREE_VALUE (arg
);
3017 /* No need to check arglist against parmlist here; we did that
3018 in coerce_template_parms, called from lookup_template_class. */
3019 cat (expr_as_string (arg
, 0));
3022 char *bufp
= obstack_next_free (&scratch_obstack
);
3024 while (bufp
[offset
- 1] == ' ')
3026 obstack_blank_fast (&scratch_obstack
, offset
);
3028 /* B<C<char> >, not B<C<char>> */
3029 if (bufp
[offset
- 1] == '>')
3034 return (char *) obstack_base (&scratch_obstack
);
3038 classtype_mangled_name (t
)
3041 if (CLASSTYPE_TEMPLATE_INFO (t
)
3042 /* Specializations have already had their names set up in
3043 lookup_template_class. */
3044 && !CLASSTYPE_TEMPLATE_SPECIALIZATION (t
)
3045 /* For non-primary templates, the template parameters are
3046 implicit from their surrounding context. */
3047 && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (t
)))
3049 tree name
= DECL_NAME (CLASSTYPE_TI_TEMPLATE (t
));
3050 char *mangled_name
= mangle_class_name_for_template
3051 (IDENTIFIER_POINTER (name
),
3052 DECL_INNERMOST_TEMPLATE_PARMS (CLASSTYPE_TI_TEMPLATE (t
)),
3053 CLASSTYPE_TI_ARGS (t
));
3054 tree id
= get_identifier (mangled_name
);
3055 IDENTIFIER_TEMPLATE (id
) = name
;
3059 return TYPE_IDENTIFIER (t
);
3063 add_pending_template (d
)
3068 if (TREE_CODE_CLASS (TREE_CODE (d
)) == 't')
3069 ti
= CLASSTYPE_TEMPLATE_INFO (d
);
3071 ti
= DECL_TEMPLATE_INFO (d
);
3073 if (TI_PENDING_TEMPLATE_FLAG (ti
))
3076 *template_tail
= perm_tree_cons
3077 (build_srcloc_here (), d
, NULL_TREE
);
3078 template_tail
= &TREE_CHAIN (*template_tail
);
3079 TI_PENDING_TEMPLATE_FLAG (ti
) = 1;
3083 /* Return a TEMPLATE_ID_EXPR corresponding to the indicated FNS (which
3084 may be either a _DECL or an overloaded function or an
3085 IDENTIFIER_NODE), and ARGLIST. */
3088 lookup_template_function (fns
, arglist
)
3093 if (fns
== NULL_TREE
)
3095 cp_error ("non-template used as template");
3096 return error_mark_node
;
3099 type
= TREE_TYPE (fns
);
3100 if (TREE_CODE (fns
) == OVERLOAD
|| !type
)
3101 type
= unknown_type_node
;
3103 if (processing_template_decl
)
3104 return build_min (TEMPLATE_ID_EXPR
, type
, fns
, arglist
);
3106 return build (TEMPLATE_ID_EXPR
, type
, fns
, arglist
);
3109 /* Within the scope of a template class S<T>, the name S gets bound
3110 (in build_self_reference) to a TYPE_DECL for the class, not a
3111 TEMPLATE_DECL. If DECL is a TYPE_DECL for current_class_type,
3112 or one of its enclosing classes, and that type is a template,
3113 return the associated TEMPLATE_DECL. Otherwise, the original
3114 DECL is returned. */
3117 maybe_get_template_decl_from_type_decl (decl
)
3120 return (decl
!= NULL_TREE
3121 && TREE_CODE (decl
) == TYPE_DECL
3122 && DECL_ARTIFICIAL (decl
)
3123 && CLASSTYPE_TEMPLATE_INFO (TREE_TYPE (decl
)))
3124 ? CLASSTYPE_TI_TEMPLATE (TREE_TYPE (decl
)) : decl
;
3127 /* Given an IDENTIFIER_NODE (type TEMPLATE_DECL) and a chain of
3128 parameters, find the desired type.
3130 D1 is the PTYPENAME terminal, and ARGLIST is the list of arguments.
3131 (Actually ARGLIST may be either a TREE_LIST or a TREE_VEC. It will
3132 be a TREE_LIST if called directly from the parser, and a TREE_VEC
3133 otherwise.) Since ARGLIST is build on the decl_obstack, we must
3134 copy it here to keep it from being reclaimed when the decl storage
3137 IN_DECL, if non-NULL, is the template declaration we are trying to
3140 If ENTERING_SCOPE is non-zero, we are about to enter the scope of
3141 the class we are looking up.
3143 If the template class is really a local class in a template
3144 function, then the FUNCTION_CONTEXT is the function in which it is
3145 being instantiated. */
3148 lookup_template_class (d1
, arglist
, in_decl
, context
, entering_scope
)
3154 tree
template = NULL_TREE
, parmlist
;
3157 if (TREE_CODE (d1
) == IDENTIFIER_NODE
)
3159 if (IDENTIFIER_LOCAL_VALUE (d1
)
3160 && DECL_TEMPLATE_TEMPLATE_PARM_P (IDENTIFIER_LOCAL_VALUE (d1
)))
3161 template = IDENTIFIER_LOCAL_VALUE (d1
);
3165 push_decl_namespace (context
);
3166 if (current_class_type
!= NULL_TREE
)
3168 maybe_get_template_decl_from_type_decl
3169 (IDENTIFIER_CLASS_VALUE (d1
));
3170 if (template == NULL_TREE
)
3171 template = lookup_name_nonclass (d1
);
3173 pop_decl_namespace ();
3176 context
= DECL_CONTEXT (template);
3178 else if (TREE_CODE (d1
) == TYPE_DECL
&& IS_AGGR_TYPE (TREE_TYPE (d1
)))
3180 if (CLASSTYPE_TEMPLATE_INFO (TREE_TYPE (d1
)) == NULL_TREE
)
3181 return error_mark_node
;
3182 template = CLASSTYPE_TI_TEMPLATE (TREE_TYPE (d1
));
3183 d1
= DECL_NAME (template);
3185 else if (TREE_CODE (d1
) == ENUMERAL_TYPE
3186 || (TREE_CODE_CLASS (TREE_CODE (d1
)) == 't'
3187 && IS_AGGR_TYPE (d1
)))
3189 template = TYPE_TI_TEMPLATE (d1
);
3190 d1
= DECL_NAME (template);
3192 else if (TREE_CODE (d1
) == TEMPLATE_DECL
3193 && TREE_CODE (DECL_RESULT (d1
)) == TYPE_DECL
)
3196 d1
= DECL_NAME (template);
3197 context
= DECL_CONTEXT (template);
3200 my_friendly_abort (272);
3202 /* With something like `template <class T> class X class X { ... };'
3203 we could end up with D1 having nothing but an IDENTIFIER_LOCAL_VALUE.
3204 We don't want to do that, but we have to deal with the situation, so
3205 let's give them some syntax errors to chew on instead of a crash. */
3207 return error_mark_node
;
3209 if (context
== NULL_TREE
)
3210 context
= global_namespace
;
3212 if (TREE_CODE (template) != TEMPLATE_DECL
)
3214 cp_error ("non-template type `%T' used as a template", d1
);
3216 cp_error_at ("for template declaration `%D'", in_decl
);
3217 return error_mark_node
;
3220 if (DECL_TEMPLATE_TEMPLATE_PARM_P (template))
3222 /* Create a new TEMPLATE_DECL and TEMPLATE_TEMPLATE_PARM node to store
3223 template arguments */
3225 tree parm
= copy_template_template_parm (TREE_TYPE (template));
3226 tree template2
= TYPE_STUB_DECL (parm
);
3229 CLASSTYPE_GOT_SEMICOLON (parm
) = 1;
3230 parmlist
= DECL_INNERMOST_TEMPLATE_PARMS (template);
3232 arglist2
= coerce_template_parms (parmlist
, arglist
, template, 1, 1);
3233 if (arglist2
== error_mark_node
)
3234 return error_mark_node
;
3236 arglist2
= copy_to_permanent (arglist2
);
3237 CLASSTYPE_TEMPLATE_INFO (parm
)
3238 = perm_tree_cons (template2
, arglist2
, NULL_TREE
);
3239 TYPE_SIZE (parm
) = 0;
3244 extern tree current_local_enum
;
3245 tree template_type
= TREE_TYPE (template);
3247 tree found
= NULL_TREE
;
3250 int is_partial_instantiation
;
3251 tree prev_local_enum
;
3253 template = most_general_template (template);
3254 parmlist
= DECL_TEMPLATE_PARMS (template);
3255 parm_depth
= TMPL_PARMS_DEPTH (parmlist
);
3256 arg_depth
= TMPL_ARGS_DEPTH (arglist
);
3258 if (arg_depth
== 1 && parm_depth
> 1)
3260 /* We've been given an incomplete set of template arguments.
3263 template <class T> struct S1 {
3264 template <class U> struct S2 {};
3265 template <class U> struct S2<U*> {};
3268 we will be called with an ARGLIST of `U*', but the
3269 TEMPLATE will be `template <class T> template
3270 <class U> struct S1<T>::S2'. We must fill in the missing
3272 my_friendly_assert (context
!= NULL_TREE
, 0);
3273 while (!IS_AGGR_TYPE_CODE (TREE_CODE (context
))
3274 && context
!= global_namespace
)
3275 context
= DECL_REAL_CONTEXT (context
);
3277 if (context
== global_namespace
)
3278 /* This is bad. We cannot get enough arguments, even from
3279 the surrounding context, to resolve this class. One
3280 case where this might happen is (illegal) code like:
3288 We should catch this error sooner (at the opening curly
3289 for `S', but it is better to be safe than sorry here. */
3291 cp_error ("invalid use of `%D'", template);
3292 return error_mark_node
;
3295 arglist
= add_to_template_args (TYPE_TI_ARGS (context
),
3297 arg_depth
= TMPL_ARGS_DEPTH (arglist
);
3300 my_friendly_assert (parm_depth
== arg_depth
, 0);
3302 /* Calculate the BOUND_ARGS. These will be the args that are
3303 actually tsubst'd into the definition to create the
3307 /* We have multiple levels of arguments to coerce, at once. */
3309 int saved_depth
= TMPL_ARGS_DEPTH (arglist
);
3311 tree bound_args
= make_tree_vec (parm_depth
);
3313 for (i
= saved_depth
,
3314 t
= DECL_TEMPLATE_PARMS (template);
3315 i
> 0 && t
!= NULL_TREE
;
3316 --i
, t
= TREE_CHAIN (t
))
3318 tree a
= coerce_template_parms (TREE_VALUE (t
),
3319 arglist
, template, 1, 1);
3320 SET_TMPL_ARGS_LEVEL (bound_args
, i
, a
);
3322 /* We temporarily reduce the length of the ARGLIST so
3323 that coerce_template_parms will see only the arguments
3324 corresponding to the template parameters it is
3326 TREE_VEC_LENGTH (arglist
)--;
3329 /* Restore the ARGLIST to its full size. */
3330 TREE_VEC_LENGTH (arglist
) = saved_depth
;
3332 arglist
= bound_args
;
3336 = coerce_template_parms (INNERMOST_TEMPLATE_PARMS (parmlist
),
3337 innermost_args (arglist
),
3340 if (arglist
== error_mark_node
)
3341 /* We were unable to bind the arguments. */
3342 return error_mark_node
;
3344 /* In the scope of a template class, explicit references to the
3345 template class refer to the type of the template, not any
3346 instantiation of it. For example, in:
3348 template <class T> class C { void f(C<T>); }
3350 the `C<T>' is just the same as `C'. Outside of the
3351 class, however, such a reference is an instantiation. */
3352 if (comp_template_args (TYPE_TI_ARGS (template_type
),
3355 found
= template_type
;
3357 if (!entering_scope
&& PRIMARY_TEMPLATE_P (template))
3361 /* Note that we use DECL_CONTEXT, rather than
3362 CP_DECL_CONTEXT, so that the termination test is
3363 always just `ctx'. We're not interested in namepace
3365 for (ctx
= current_class_type
;
3367 ctx
= (TREE_CODE_CLASS (TREE_CODE (ctx
)) == 't')
3368 ? TYPE_CONTEXT (ctx
) : DECL_CONTEXT (ctx
))
3369 if (comptypes (ctx
, template_type
, 1))
3373 /* We're not in the scope of the class, so the
3374 TEMPLATE_TYPE is not the type we want after
3382 for (found
= DECL_TEMPLATE_INSTANTIATIONS (template);
3383 found
; found
= TREE_CHAIN (found
))
3384 if (comp_template_args (TREE_PURPOSE (found
), arglist
))
3388 found
= TREE_VALUE (found
);
3393 if (can_free (&permanent_obstack
, arglist
))
3394 obstack_free (&permanent_obstack
, arglist
);
3398 /* Since we didn't find the type, we'll have to create it.
3399 Since we'll be saving this type on the
3400 DECL_TEMPLATE_INSTANTIATIONS list, it must be permanent. */
3401 push_obstacks (&permanent_obstack
, &permanent_obstack
);
3403 /* This type is a "partial instantiation" if any of the template
3404 arguments still inolve template parameters. */
3405 is_partial_instantiation
= uses_template_parms (arglist
);
3407 /* Create the type. */
3408 if (TREE_CODE (template_type
) == ENUMERAL_TYPE
)
3410 if (!is_partial_instantiation
)
3412 prev_local_enum
= current_local_enum
;
3413 t
= start_enum (TYPE_IDENTIFIER (template_type
));
3416 /* We don't want to call start_enum for this type, since
3417 the values for the enumeration constants may involve
3418 template parameters. And, no one should be interested
3419 in the enumeration constants for such a type. */
3420 t
= make_node (ENUMERAL_TYPE
);
3424 t
= make_lang_type (TREE_CODE (template_type
));
3425 CLASSTYPE_DECLARED_CLASS (t
)
3426 = CLASSTYPE_DECLARED_CLASS (template_type
);
3427 CLASSTYPE_GOT_SEMICOLON (t
) = 1;
3428 SET_CLASSTYPE_IMPLICIT_INSTANTIATION (t
);
3429 TYPE_FOR_JAVA (t
) = TYPE_FOR_JAVA (template_type
);
3432 /* If we called tsubst_enum above, this information will already
3436 TYPE_CONTEXT (t
) = FROB_CONTEXT (context
);
3438 /* Create a stub TYPE_DECL for it. */
3439 type_decl
= build_decl (TYPE_DECL
, DECL_NAME (template), t
);
3440 SET_DECL_ARTIFICIAL (type_decl
);
3441 DECL_CONTEXT (type_decl
) = TYPE_CONTEXT (t
);
3442 DECL_SOURCE_FILE (type_decl
)
3443 = DECL_SOURCE_FILE (TYPE_STUB_DECL (template_type
));
3444 DECL_SOURCE_LINE (type_decl
)
3445 = DECL_SOURCE_LINE (TYPE_STUB_DECL (template_type
));
3446 TYPE_STUB_DECL (t
) = TYPE_NAME (t
) = type_decl
;
3449 type_decl
= TYPE_NAME (t
);
3451 /* Set up the template information. */
3452 arglist
= copy_to_permanent (arglist
);
3453 SET_TYPE_TEMPLATE_INFO (t
,
3454 tree_cons (template, arglist
, NULL_TREE
));
3455 DECL_TEMPLATE_INSTANTIATIONS (template)
3456 = tree_cons (arglist
, t
,
3457 DECL_TEMPLATE_INSTANTIATIONS (template));
3459 if (TREE_CODE (t
) == ENUMERAL_TYPE
3460 && !is_partial_instantiation
)
3462 /* Now that the type has been registered on the
3463 instantiations list, we set up the enumerators. Because
3464 the enumeration constants may involve the enumeration
3465 type itself, we make sure to register the type first, and
3466 then create the constants. That way, doing tsubst_expr
3467 for the enumeration constants won't result in recursive
3468 calls here; we'll find the instantiation and exit above. */
3469 tsubst_enum (template_type
, t
, arglist
);
3470 current_local_enum
= prev_local_enum
;
3473 /* We're done with the permanent obstack, now. */
3476 /* Reset the name of the type, now that CLASSTYPE_TEMPLATE_INFO
3478 if (TREE_CODE (t
) != ENUMERAL_TYPE
)
3479 DECL_NAME (type_decl
) = classtype_mangled_name (t
);
3480 DECL_ASSEMBLER_NAME (type_decl
) = DECL_NAME (type_decl
);
3481 if (!is_partial_instantiation
)
3483 DECL_ASSEMBLER_NAME (type_decl
)
3484 = get_identifier (build_overload_name (t
, 1, 1));
3486 /* For backwards compatibility; code that uses
3487 -fexternal-templates expects looking up a template to
3488 instantiate it. I think DDD still relies on this.
3489 (jason 8/20/1998) */
3490 if (TREE_CODE (t
) != ENUMERAL_TYPE
3491 && flag_external_templates
3492 && CLASSTYPE_INTERFACE_KNOWN (TREE_TYPE (template))
3493 && ! CLASSTYPE_INTERFACE_ONLY (TREE_TYPE (template)))
3494 add_pending_template (t
);
3497 /* If the type makes use of template parameters, the
3498 code that generates debugging information will crash. */
3499 DECL_IGNORED_P (TYPE_STUB_DECL (t
)) = 1;
3505 /* For each TEMPLATE_TYPE_PARM, TEMPLATE_TEMPLATE_PARM, or
3506 TEMPLATE_PARM_INDEX in T, call FN with the parameter and the DATA.
3507 If FN returns non-zero, the iteration is terminated, and
3508 for_each_template_parm returns 1. Otherwise, the iteration
3509 continues. If FN never returns a non-zero value, the value
3510 returned by for_each_template_parm is 0. If FN is NULL, it is
3511 considered to be the function which always returns 1. */
3514 for_each_template_parm (t
, fn
, data
)
3522 if (TREE_CODE_CLASS (TREE_CODE (t
)) == 't'
3523 && for_each_template_parm (TYPE_CONTEXT (t
), fn
, data
))
3526 switch (TREE_CODE (t
))
3530 /* We assume that the object must be instantiated in order to build
3531 the COMPONENT_REF, so we test only whether the type of the
3532 COMPONENT_REF uses template parms. */
3533 return for_each_template_parm (TREE_TYPE (t
), fn
, data
);
3535 case IDENTIFIER_NODE
:
3536 if (!IDENTIFIER_TEMPLATE (t
))
3538 my_friendly_abort (42);
3540 /* aggregates of tree nodes */
3543 int i
= TREE_VEC_LENGTH (t
);
3545 if (for_each_template_parm (TREE_VEC_ELT (t
, i
), fn
, data
))
3550 if (for_each_template_parm (TREE_PURPOSE (t
), fn
, data
)
3551 || for_each_template_parm (TREE_VALUE (t
), fn
, data
))
3553 return for_each_template_parm (TREE_CHAIN (t
), fn
, data
);
3556 if (for_each_template_parm (OVL_FUNCTION (t
), fn
, data
))
3558 return for_each_template_parm (OVL_CHAIN (t
), fn
, data
);
3560 /* constructed type nodes */
3562 case REFERENCE_TYPE
:
3563 return for_each_template_parm (TREE_TYPE (t
), fn
, data
);
3566 if (TYPE_PTRMEMFUNC_FLAG (t
))
3567 return for_each_template_parm (TYPE_PTRMEMFUNC_FN_TYPE (t
),
3573 if (! TYPE_TEMPLATE_INFO (t
))
3575 return for_each_template_parm (TREE_VALUE
3576 (TYPE_TEMPLATE_INFO (t
)),
3579 if (for_each_template_parm (TYPE_ARG_TYPES (t
), fn
, data
))
3581 return for_each_template_parm (TREE_TYPE (t
), fn
, data
);
3583 if (for_each_template_parm (TYPE_DOMAIN (t
), fn
, data
))
3585 return for_each_template_parm (TREE_TYPE (t
), fn
, data
);
3587 if (for_each_template_parm (TYPE_OFFSET_BASETYPE (t
), fn
, data
))
3589 return for_each_template_parm (TREE_TYPE (t
), fn
, data
);
3591 if (for_each_template_parm (TYPE_METHOD_BASETYPE (t
), fn
, data
))
3593 if (for_each_template_parm (TYPE_ARG_TYPES (t
), fn
, data
))
3595 return for_each_template_parm (TREE_TYPE (t
), fn
, data
);
3599 return for_each_template_parm (TREE_TYPE (t
), fn
, data
);
3602 /* A template template parameter is encountered */
3603 if (DECL_TEMPLATE_TEMPLATE_PARM_P (t
))
3604 return for_each_template_parm (TREE_TYPE (t
), fn
, data
);
3605 /* Already substituted template template parameter */
3609 if (for_each_template_parm (DECL_INITIAL (t
), fn
, data
))
3611 goto check_type_and_context
;
3615 /* ??? What about FIELD_DECLs? */
3616 if (DECL_LANG_SPECIFIC (t
) && DECL_TEMPLATE_INFO (t
)
3617 && for_each_template_parm (DECL_TI_ARGS (t
), fn
, data
))
3621 check_type_and_context
:
3622 if (for_each_template_parm (TREE_TYPE (t
), fn
, data
))
3624 if (DECL_CONTEXT (t
)
3625 && for_each_template_parm (DECL_CONTEXT (t
), fn
, data
))
3630 return for_each_template_parm (TREE_TYPE (t
), fn
, data
);
3632 return for_each_template_parm (TREE_OPERAND (t
, 0), fn
, data
);
3634 /* template parm nodes */
3635 case TEMPLATE_TEMPLATE_PARM
:
3636 /* Record template parameters such as `T' inside `TT<T>'. */
3637 if (CLASSTYPE_TEMPLATE_INFO (t
)
3638 && for_each_template_parm (CLASSTYPE_TI_ARGS (t
), fn
, data
))
3640 case TEMPLATE_TYPE_PARM
:
3641 case TEMPLATE_PARM_INDEX
:
3643 return (*fn
)(t
, data
);
3647 /* simple type nodes */
3649 if (for_each_template_parm (TYPE_MIN_VALUE (t
), fn
, data
))
3651 return for_each_template_parm (TYPE_MAX_VALUE (t
), fn
, data
);
3657 case NAMESPACE_DECL
:
3667 /* Non-error_mark_node ERROR_MARKs are bad things. */
3668 my_friendly_assert (t
== error_mark_node
, 274);
3677 return for_each_template_parm (TREE_OPERAND (t
, 0), fn
, data
);
3680 if (TREE_TYPE (t
) && TYPE_PTRMEMFUNC_P (TREE_TYPE (t
)))
3681 return for_each_template_parm (TYPE_PTRMEMFUNC_FN_TYPE
3682 (TREE_TYPE (t
)), fn
, data
);
3683 return for_each_template_parm (TREE_OPERAND (t
, 1), fn
, data
);
3687 case REINTERPRET_CAST_EXPR
:
3688 case CONST_CAST_EXPR
:
3689 case STATIC_CAST_EXPR
:
3690 case DYNAMIC_CAST_EXPR
:
3698 return for_each_template_parm (TREE_OPERAND (t
, 0), fn
, data
);
3701 switch (TREE_CODE_CLASS (TREE_CODE (t
)))
3709 for (i
= first_rtl_op (TREE_CODE (t
)); --i
>= 0;)
3710 if (for_each_template_parm (TREE_OPERAND (t
, i
), fn
, data
))
3717 sorry ("testing %s for template parms",
3718 tree_code_name
[(int) TREE_CODE (t
)]);
3719 my_friendly_abort (82);
3726 uses_template_parms (t
)
3729 return for_each_template_parm (t
, 0, 0);
3732 static struct tinst_level
*current_tinst_level
;
3733 static struct tinst_level
*free_tinst_level
;
3734 static int tinst_depth
;
3735 extern int max_tinst_depth
;
3736 #ifdef GATHER_STATISTICS
3739 int tinst_level_tick
;
3740 int last_template_error_tick
;
3742 /* Print out all the template instantiations that we are currently
3743 working on. If ERR, we are being called from cp_thing, so do
3744 the right thing for an error message. */
3747 print_template_context (err
)
3750 struct tinst_level
*p
= current_tinst_level
;
3752 char *file
= input_filename
;
3756 if (current_function_decl
!= p
->decl
3757 && current_function_decl
!= NULL_TREE
)
3758 /* We can get here during the processing of some synthesized
3759 method. Then, p->decl will be the function that's causing
3764 if (current_function_decl
== p
->decl
)
3765 /* Avoid redundancy with the the "In function" line. */;
3767 fprintf (stderr
, "%s: In instantiation of `%s':\n",
3768 file
, decl_as_string (p
->decl
, 0));
3776 for (; p
; p
= p
->next
)
3778 fprintf (stderr
, "%s:%d: instantiated from `%s'\n", file
, line
,
3779 decl_as_string (p
->decl
, 0));
3783 fprintf (stderr
, "%s:%d: instantiated from here\n", file
, line
);
3786 /* Called from cp_thing to print the template context for an error. */
3789 maybe_print_template_context ()
3791 if (last_template_error_tick
== tinst_level_tick
3792 || current_tinst_level
== 0)
3795 last_template_error_tick
= tinst_level_tick
;
3796 print_template_context (1);
3800 push_tinst_level (d
)
3803 struct tinst_level
*new;
3805 if (tinst_depth
>= max_tinst_depth
)
3807 /* If the instantiation in question still has unbound template parms,
3808 we don't really care if we can't instantiate it, so just return.
3809 This happens with base instantiation for implicit `typename'. */
3810 if (uses_template_parms (d
))
3813 last_template_error_tick
= tinst_level_tick
;
3814 error ("template instantiation depth exceeds maximum of %d",
3816 error (" (use -ftemplate-depth-NN to increase the maximum)");
3817 cp_error (" instantiating `%D'", d
);
3819 print_template_context (0);
3824 if (free_tinst_level
)
3826 new = free_tinst_level
;
3827 free_tinst_level
= new->next
;
3830 new = (struct tinst_level
*) xmalloc (sizeof (struct tinst_level
));
3834 new->file
= input_filename
;
3835 new->next
= current_tinst_level
;
3836 current_tinst_level
= new;
3839 #ifdef GATHER_STATISTICS
3840 if (tinst_depth
> depth_reached
)
3841 depth_reached
= tinst_depth
;
3851 struct tinst_level
*old
= current_tinst_level
;
3853 /* Restore the filename and line number stashed away when we started
3854 this instantiation. */
3856 input_filename
= old
->file
;
3858 current_tinst_level
= old
->next
;
3859 old
->next
= free_tinst_level
;
3860 free_tinst_level
= old
;
3865 struct tinst_level
*
3868 struct tinst_level
*p
= current_tinst_level
;
3871 for (; p
->next
; p
= p
->next
)
3876 /* DECL is a friend FUNCTION_DECL or TEMPLATE_DECL. ARGS is the
3877 vector of template arguments, as for tsubst.
3879 Returns an appropriate tsbust'd friend declaration. */
3882 tsubst_friend_function (decl
, args
)
3888 char *file
= input_filename
;
3890 lineno
= DECL_SOURCE_LINE (decl
);
3891 input_filename
= DECL_SOURCE_FILE (decl
);
3893 if (TREE_CODE (decl
) == FUNCTION_DECL
3894 && DECL_TEMPLATE_INSTANTIATION (decl
)
3895 && TREE_CODE (DECL_TI_TEMPLATE (decl
)) != TEMPLATE_DECL
)
3896 /* This was a friend declared with an explicit template
3897 argument list, e.g.:
3901 to indicate that f was a template instantiation, not a new
3902 function declaration. Now, we have to figure out what
3903 instantiation of what template. */
3910 = lookup_template_function (tsubst_expr (DECL_TI_TEMPLATE (decl
),
3912 tsubst (DECL_TI_ARGS (decl
),
3914 /* FIXME: The decl we create via the next tsubst could be
3915 created on a temporary obstack. */
3916 new_friend
= tsubst (decl
, args
, NULL_TREE
);
3917 tmpl
= determine_specialization (template_id
, new_friend
,
3919 /*need_member_template=*/0,
3921 new_friend
= instantiate_template (tmpl
, new_args
);
3925 new_friend
= tsubst (decl
, args
, NULL_TREE
);
3927 /* The NEW_FRIEND will look like an instantiation, to the
3928 compiler, but is not an instantiation from the point of view of
3929 the language. For example, we might have had:
3931 template <class T> struct S {
3932 template <class U> friend void f(T, U);
3935 Then, in S<int>, template <class U> void f(int, U) is not an
3936 instantiation of anything. */
3937 DECL_USE_TEMPLATE (new_friend
) = 0;
3938 if (TREE_CODE (decl
) == TEMPLATE_DECL
)
3939 DECL_USE_TEMPLATE (DECL_TEMPLATE_RESULT (new_friend
)) = 0;
3941 /* The mangled name for the NEW_FRIEND is incorrect. The call to
3942 tsubst will have resulted in a call to
3943 set_mangled_name_for_template_decl. But, the function is not a
3944 template instantiation and should not be mangled like one.
3945 Therefore, we remangle the function name. We don't have to do
3946 this if the NEW_FRIEND is a template since
3947 set_mangled_name_for_template_decl doesn't do anything if the
3948 function declaration still uses template arguments. */
3949 if (TREE_CODE (new_friend
) != TEMPLATE_DECL
)
3951 set_mangled_name_for_decl (new_friend
);
3952 DECL_RTL (new_friend
) = 0;
3953 make_decl_rtl (new_friend
, NULL_PTR
, 1);
3956 if (DECL_NAMESPACE_SCOPE_P (new_friend
))
3959 tree new_friend_args
;
3961 if (TREE_CODE (new_friend
) == TEMPLATE_DECL
)
3962 /* This declaration is a `primary' template. */
3963 DECL_PRIMARY_TEMPLATE (new_friend
) = new_friend
;
3965 /* We must save the DECL_TI_ARGS for NEW_FRIEND here because
3966 pushdecl may call duplicate_decls which will free NEW_FRIEND
3968 new_friend_args
= DECL_TI_ARGS (new_friend
);
3969 old_decl
= pushdecl_namespace_level (new_friend
);
3971 if (old_decl
!= new_friend
)
3973 /* This new friend declaration matched an existing
3974 declaration. For example, given:
3976 template <class T> void f(T);
3977 template <class U> class C {
3978 template <class T> friend void f(T) {}
3981 the friend declaration actually provides the definition
3982 of `f', once C has been instantiated for some type. So,
3983 old_decl will be the out-of-class template declaration,
3984 while new_friend is the in-class definition.
3986 But, if `f' was called before this point, the
3987 instantiation of `f' will have DECL_TI_ARGS corresponding
3988 to `T' but not to `U', references to which might appear
3989 in the definition of `f'. Previously, the most general
3990 template for an instantiation of `f' was the out-of-class
3991 version; now it is the in-class version. Therefore, we
3992 run through all specialization of `f', adding to their
3993 DECL_TI_ARGS appropriately. In particular, they need a
3994 new set of outer arguments, corresponding to the
3995 arguments for this class instantiation.
3997 The same situation can arise with something like this:
4000 template <class T> class C {
4004 when `C<int>' is instantiated. Now, `f(int)' is defined
4007 if (TREE_CODE (old_decl
) != TEMPLATE_DECL
)
4008 /* duplicate_decls will take care of this case. */
4014 for (t
= DECL_TEMPLATE_SPECIALIZATIONS (old_decl
);
4018 tree spec
= TREE_VALUE (t
);
4021 = add_outermost_template_args (new_friend_args
,
4022 DECL_TI_ARGS (spec
));
4024 = copy_to_permanent (DECL_TI_ARGS (spec
));
4027 /* Now, since specializations are always supposed to
4028 hang off of the most general template, we must move
4030 t
= most_general_template (old_decl
);
4033 DECL_TEMPLATE_SPECIALIZATIONS (t
)
4034 = chainon (DECL_TEMPLATE_SPECIALIZATIONS (t
),
4035 DECL_TEMPLATE_SPECIALIZATIONS (old_decl
));
4036 DECL_TEMPLATE_SPECIALIZATIONS (old_decl
) = NULL_TREE
;
4040 /* The information from NEW_FRIEND has been merged into OLD_DECL
4041 by duplicate_decls. */
4042 new_friend
= old_decl
;
4045 else if (TYPE_SIZE (DECL_CONTEXT (new_friend
)))
4047 /* Check to see that the declaration is really present, and,
4048 possibly obtain an improved declaration. */
4049 tree fn
= check_classfn (DECL_CONTEXT (new_friend
),
4058 input_filename
= file
;
4062 /* FRIEND_TMPL is a friend TEMPLATE_DECL. ARGS is the vector of
4063 template arguments, as for tsubst.
4065 Returns an appropriate tsbust'd friend type. */
4068 tsubst_friend_class (friend_tmpl
, args
)
4073 tree tmpl
= lookup_name (DECL_NAME (friend_tmpl
), 1);
4075 tmpl
= maybe_get_template_decl_from_type_decl (tmpl
);
4077 if (tmpl
!= NULL_TREE
&& DECL_CLASS_TEMPLATE_P (tmpl
))
4079 /* The friend template has already been declared. Just
4080 check to see that the declarations match, and install any new
4081 default parameters. We must tsubst the default parameters,
4082 of course. We only need the innermost template parameters
4083 because that is all that redeclare_class_template will look
4086 = tsubst_template_parms (DECL_TEMPLATE_PARMS (friend_tmpl
),
4088 redeclare_class_template (TREE_TYPE (tmpl
), parms
);
4089 friend_type
= TREE_TYPE (tmpl
);
4093 /* The friend template has not already been declared. In this
4094 case, the instantiation of the template class will cause the
4095 injection of this template into the global scope. */
4096 tmpl
= tsubst (friend_tmpl
, args
, NULL_TREE
);
4098 /* The new TMPL is not an instantiation of anything, so we
4099 forget its origins. We don't reset CLASSTYPE_TI_TEMPLATE for
4100 the new type because that is supposed to be the corresponding
4101 template decl, i.e., TMPL. */
4102 DECL_USE_TEMPLATE (tmpl
) = 0;
4103 DECL_TEMPLATE_INFO (tmpl
) = NULL_TREE
;
4104 CLASSTYPE_USE_TEMPLATE (TREE_TYPE (tmpl
)) = 0;
4106 /* Inject this template into the global scope. */
4107 friend_type
= TREE_TYPE (pushdecl_top_level (tmpl
));
4114 instantiate_class_template (type
)
4117 tree
template, args
, pattern
, t
, *field_chain
;
4120 if (type
== error_mark_node
)
4121 return error_mark_node
;
4123 if (TYPE_BEING_DEFINED (type
) || TYPE_SIZE (type
))
4126 template = most_general_template (CLASSTYPE_TI_TEMPLATE (type
));
4127 args
= CLASSTYPE_TI_ARGS (type
);
4128 my_friendly_assert (TREE_CODE (template) == TEMPLATE_DECL
, 279);
4129 t
= most_specialized_class (template, args
);
4131 if (t
== error_mark_node
)
4133 char *str
= "candidates are:";
4134 cp_error ("ambiguous class template instantiation for `%#T'", type
);
4135 for (t
= DECL_TEMPLATE_SPECIALIZATIONS (template); t
; t
= TREE_CHAIN (t
))
4137 if (get_class_bindings (TREE_VALUE (t
), TREE_PURPOSE (t
),
4140 cp_error_at ("%s %+#T", str
, TREE_TYPE (t
));
4144 TYPE_BEING_DEFINED (type
) = 1;
4145 return error_mark_node
;
4148 pattern
= TREE_TYPE (t
);
4150 pattern
= TREE_TYPE (template);
4152 if (TYPE_SIZE (pattern
) == NULL_TREE
)
4157 /* This TYPE is actually a instantiation of of a partial
4158 specialization. We replace the innermost set of ARGS with
4159 the arguments appropriate for substitution. For example,
4162 template <class T> struct S {};
4163 template <class T> struct S<T*> {};
4165 and supposing that we are instantiating S<int*>, ARGS will
4166 present be {int*} but we need {int}. */
4168 = get_class_bindings (TREE_VALUE (t
), TREE_PURPOSE (t
),
4171 /* If there were multiple levels in ARGS, replacing the
4172 innermost level would alter CLASSTYPE_TI_ARGS, which we don't
4173 want, so we make a copy first. */
4174 if (TMPL_ARGS_HAVE_MULTIPLE_LEVELS (args
))
4176 args
= copy_node (args
);
4177 SET_TMPL_ARGS_LEVEL (args
, TMPL_ARGS_DEPTH (args
), inner_args
);
4183 if (pedantic
&& uses_template_parms (args
))
4184 /* If there are still template parameters amongst the args, then
4185 we can't instantiate the type; there's no telling whether or not one
4186 of the template parameters might eventually be instantiated to some
4187 value that results in a specialization being used. */
4190 TYPE_BEING_DEFINED (type
) = 1;
4192 if (! push_tinst_level (type
))
4195 maybe_push_to_top_level (uses_template_parms (type
));
4196 pushclass (type
, 0);
4198 /* We must copy the arguments to the permanent obstack since
4199 during the tsubst'ing below they may wind up in the
4200 DECL_TI_ARGS of some instantiated member template. */
4201 args
= copy_to_permanent (args
);
4203 if (flag_external_templates
)
4205 if (flag_alt_external_templates
)
4207 CLASSTYPE_INTERFACE_ONLY (type
) = interface_only
;
4208 SET_CLASSTYPE_INTERFACE_UNKNOWN_X (type
, interface_unknown
);
4209 CLASSTYPE_VTABLE_NEEDS_WRITING (type
)
4210 = (! CLASSTYPE_INTERFACE_ONLY (type
)
4211 && CLASSTYPE_INTERFACE_KNOWN (type
));
4215 CLASSTYPE_INTERFACE_ONLY (type
) = CLASSTYPE_INTERFACE_ONLY (pattern
);
4216 SET_CLASSTYPE_INTERFACE_UNKNOWN_X
4217 (type
, CLASSTYPE_INTERFACE_UNKNOWN (pattern
));
4218 CLASSTYPE_VTABLE_NEEDS_WRITING (type
)
4219 = (! CLASSTYPE_INTERFACE_ONLY (type
)
4220 && CLASSTYPE_INTERFACE_KNOWN (type
));
4225 SET_CLASSTYPE_INTERFACE_UNKNOWN (type
);
4226 CLASSTYPE_VTABLE_NEEDS_WRITING (type
) = 1;
4229 TYPE_HAS_CONSTRUCTOR (type
) = TYPE_HAS_CONSTRUCTOR (pattern
);
4230 TYPE_HAS_DESTRUCTOR (type
) = TYPE_HAS_DESTRUCTOR (pattern
);
4231 TYPE_HAS_ASSIGNMENT (type
) = TYPE_HAS_ASSIGNMENT (pattern
);
4232 TYPE_OVERLOADS_CALL_EXPR (type
) = TYPE_OVERLOADS_CALL_EXPR (pattern
);
4233 TYPE_OVERLOADS_ARRAY_REF (type
) = TYPE_OVERLOADS_ARRAY_REF (pattern
);
4234 TYPE_OVERLOADS_ARROW (type
) = TYPE_OVERLOADS_ARROW (pattern
);
4235 TYPE_GETS_NEW (type
) = TYPE_GETS_NEW (pattern
);
4236 TYPE_GETS_DELETE (type
) = TYPE_GETS_DELETE (pattern
);
4237 TYPE_VEC_DELETE_TAKES_SIZE (type
) = TYPE_VEC_DELETE_TAKES_SIZE (pattern
);
4238 TYPE_HAS_ASSIGN_REF (type
) = TYPE_HAS_ASSIGN_REF (pattern
);
4239 TYPE_HAS_CONST_ASSIGN_REF (type
) = TYPE_HAS_CONST_ASSIGN_REF (pattern
);
4240 TYPE_HAS_ABSTRACT_ASSIGN_REF (type
) = TYPE_HAS_ABSTRACT_ASSIGN_REF (pattern
);
4241 TYPE_HAS_INIT_REF (type
) = TYPE_HAS_INIT_REF (pattern
);
4242 TYPE_HAS_CONST_INIT_REF (type
) = TYPE_HAS_CONST_INIT_REF (pattern
);
4243 TYPE_HAS_DEFAULT_CONSTRUCTOR (type
) = TYPE_HAS_DEFAULT_CONSTRUCTOR (pattern
);
4244 TYPE_HAS_CONVERSION (type
) = TYPE_HAS_CONVERSION (pattern
);
4245 TYPE_USES_COMPLEX_INHERITANCE (type
)
4246 = TYPE_USES_COMPLEX_INHERITANCE (pattern
);
4247 TYPE_USES_MULTIPLE_INHERITANCE (type
)
4248 = TYPE_USES_MULTIPLE_INHERITANCE (pattern
);
4249 TYPE_USES_VIRTUAL_BASECLASSES (type
)
4250 = TYPE_USES_VIRTUAL_BASECLASSES (pattern
);
4251 TYPE_PACKED (type
) = TYPE_PACKED (pattern
);
4252 TYPE_ALIGN (type
) = TYPE_ALIGN (pattern
);
4253 TYPE_FOR_JAVA (type
) = TYPE_FOR_JAVA (pattern
); /* For libjava's JArray<T> */
4255 CLASSTYPE_LOCAL_TYPEDECLS (type
) = CLASSTYPE_LOCAL_TYPEDECLS (pattern
);
4257 /* If this is a partial instantiation, don't tsubst anything. We will
4258 only use this type for implicit typename, so the actual contents don't
4259 matter. All that matters is whether a particular name is a type. */
4260 if (uses_template_parms (type
))
4262 TYPE_BINFO_BASETYPES (type
) = TYPE_BINFO_BASETYPES (pattern
);
4263 TYPE_FIELDS (type
) = TYPE_FIELDS (pattern
);
4264 TYPE_METHODS (type
) = TYPE_METHODS (pattern
);
4265 CLASSTYPE_TAGS (type
) = CLASSTYPE_TAGS (pattern
);
4266 TYPE_SIZE (type
) = integer_zero_node
;
4271 tree binfo
= TYPE_BINFO (type
);
4272 tree pbases
= TYPE_BINFO_BASETYPES (pattern
);
4278 int len
= TREE_VEC_LENGTH (pbases
);
4279 bases
= make_tree_vec (len
);
4280 for (i
= 0; i
< len
; ++i
)
4284 TREE_VEC_ELT (bases
, i
) = elt
4285 = tsubst (TREE_VEC_ELT (pbases
, i
), args
, NULL_TREE
);
4286 BINFO_INHERITANCE_CHAIN (elt
) = binfo
;
4288 basetype
= TREE_TYPE (elt
);
4290 if (! IS_AGGR_TYPE (basetype
))
4292 ("base type `%T' of `%T' fails to be a struct or class type",
4294 else if (TYPE_SIZE (complete_type (basetype
)) == NULL_TREE
)
4295 cp_error ("base class `%T' of `%T' has incomplete type",
4298 /* These are set up in xref_basetypes for normal classes, so
4299 we have to handle them here for template bases. */
4300 if (TYPE_USES_VIRTUAL_BASECLASSES (basetype
))
4302 TYPE_USES_VIRTUAL_BASECLASSES (type
) = 1;
4303 TYPE_USES_COMPLEX_INHERITANCE (type
) = 1;
4305 TYPE_GETS_NEW (type
) |= TYPE_GETS_NEW (basetype
);
4306 TYPE_GETS_DELETE (type
) |= TYPE_GETS_DELETE (basetype
);
4307 CLASSTYPE_LOCAL_TYPEDECLS (type
)
4308 |= CLASSTYPE_LOCAL_TYPEDECLS (basetype
);
4310 /* Don't initialize this until the vector is filled out, or
4311 lookups will crash. */
4312 BINFO_BASETYPES (binfo
) = bases
;
4316 field_chain
= &TYPE_FIELDS (type
);
4318 for (t
= CLASSTYPE_TAGS (pattern
); t
; t
= TREE_CHAIN (t
))
4320 tree tag
= TREE_VALUE (t
);
4321 tree name
= TYPE_IDENTIFIER (tag
);
4324 newtag
= tsubst (tag
, args
, NULL_TREE
);
4325 if (TREE_CODE (newtag
) == ENUMERAL_TYPE
)
4327 extern tree current_local_enum
;
4328 tree prev_local_enum
= current_local_enum
;
4330 if (TYPE_VALUES (newtag
))
4334 /* We must set things up so that CURRENT_LOCAL_ENUM is the
4335 CONST_DECL for the last enumeration constant, since the
4336 CONST_DECLs are chained backwards. */
4337 for (v
= TYPE_VALUES (newtag
); TREE_CHAIN (v
);
4342 = IDENTIFIER_CLASS_VALUE (TREE_PURPOSE (v
));
4343 *field_chain
= grok_enum_decls (NULL_TREE
);
4344 current_local_enum
= prev_local_enum
;
4346 while (*field_chain
)
4348 DECL_FIELD_CONTEXT (*field_chain
) = type
;
4349 field_chain
= &TREE_CHAIN (*field_chain
);
4355 /* Now, we call pushtag to put this NEWTAG into the scope of
4356 TYPE. We first set up the IDENTIFIER_TYPE_VALUE to avoid
4357 pushtag calling push_template_decl. We don't have to do
4358 this for enums because it will already have been done in
4361 SET_IDENTIFIER_TYPE_VALUE (name
, newtag
);
4362 pushtag (name
, newtag
, /*globalize=*/0);
4366 /* Don't replace enum constants here. */
4367 for (t
= TYPE_FIELDS (pattern
); t
; t
= TREE_CHAIN (t
))
4368 if (TREE_CODE (t
) != CONST_DECL
)
4372 /* The the file and line for this declaration, to assist in
4373 error message reporting. Since we called push_tinst_level
4374 above, we don't need to restore these. */
4375 lineno
= DECL_SOURCE_LINE (t
);
4376 input_filename
= DECL_SOURCE_FILE (t
);
4378 r
= tsubst (t
, args
, NULL_TREE
);
4379 if (TREE_CODE (r
) == VAR_DECL
)
4381 pending_statics
= perm_tree_cons (NULL_TREE
, r
, pending_statics
);
4382 /* Perhaps we should do more of grokfield here. */
4384 DECL_IN_AGGR_P (r
) = 1;
4385 DECL_EXTERNAL (r
) = 1;
4386 cp_finish_decl (r
, DECL_INITIAL (r
), NULL_TREE
, 0, 0);
4390 field_chain
= &TREE_CHAIN (r
);
4393 TYPE_METHODS (type
) = tsubst_chain (TYPE_METHODS (pattern
), args
);
4395 /* Construct the DECL_FRIENDLIST for the new class type. */
4396 typedecl
= TYPE_MAIN_DECL (type
);
4397 for (t
= DECL_FRIENDLIST (TYPE_MAIN_DECL (pattern
));
4403 DECL_FRIENDLIST (typedecl
)
4404 = tree_cons (TREE_PURPOSE (t
), NULL_TREE
,
4405 DECL_FRIENDLIST (typedecl
));
4407 for (friends
= TREE_VALUE (t
);
4408 friends
!= NULL_TREE
;
4409 friends
= TREE_CHAIN (friends
))
4411 if (TREE_PURPOSE (friends
) == error_mark_node
)
4413 TREE_VALUE (DECL_FRIENDLIST (typedecl
))
4414 = tree_cons (error_mark_node
,
4415 tsubst_friend_function (TREE_VALUE (friends
),
4417 TREE_VALUE (DECL_FRIENDLIST (typedecl
)));
4421 TREE_VALUE (DECL_FRIENDLIST (typedecl
))
4422 = tree_cons (tsubst (TREE_PURPOSE (friends
), args
, NULL_TREE
),
4424 TREE_VALUE (DECL_FRIENDLIST (typedecl
)));
4430 for (t
= CLASSTYPE_FRIEND_CLASSES (pattern
);
4434 tree friend_type
= TREE_VALUE (t
);
4435 tree new_friend_type
;
4437 if (TREE_CODE (friend_type
) == TEMPLATE_DECL
)
4438 new_friend_type
= tsubst_friend_class (friend_type
, args
);
4439 else if (uses_template_parms (friend_type
))
4440 new_friend_type
= tsubst (friend_type
, args
, NULL_TREE
);
4442 /* The call to xref_tag_from_type does injection for friend
4445 xref_tag_from_type (friend_type
, NULL_TREE
, 1);
4448 if (TREE_CODE (friend_type
) == TEMPLATE_DECL
)
4449 /* Trick make_friend_class into realizing that the friend
4450 we're adding is a template, not an ordinary class. It's
4451 important that we use make_friend_class since it will
4452 perform some error-checking and output cross-reference
4454 ++processing_template_decl
;
4456 make_friend_class (type
, new_friend_type
);
4458 if (TREE_CODE (friend_type
) == TEMPLATE_DECL
)
4459 --processing_template_decl
;
4462 /* This does injection for friend functions. */
4463 if (!processing_template_decl
)
4465 t
= tsubst (DECL_TEMPLATE_INJECT (template), args
, NULL_TREE
);
4467 for (; t
; t
= TREE_CHAIN (t
))
4469 tree d
= TREE_VALUE (t
);
4471 if (TREE_CODE (d
) == TYPE_DECL
)
4472 /* Already injected. */;
4478 for (t
= TYPE_FIELDS (type
); t
; t
= TREE_CHAIN (t
))
4479 if (TREE_CODE (t
) == FIELD_DECL
)
4481 TREE_TYPE (t
) = complete_type (TREE_TYPE (t
));
4482 require_complete_type (t
);
4485 type
= finish_struct_1 (type
, 0);
4486 CLASSTYPE_GOT_SEMICOLON (type
) = 1;
4488 repo_template_used (type
);
4489 if (at_eof
&& TYPE_BINFO_VTABLE (type
) != NULL_TREE
)
4490 finish_prevtable_vardecl (NULL
, TYPE_BINFO_VTABLE (type
));
4493 TYPE_BEING_DEFINED (type
) = 0;
4496 pop_from_top_level ();
4506 if (t1
== NULL_TREE
)
4507 return t2
== NULL_TREE
;
4508 if (t2
== NULL_TREE
)
4510 /* Don't care if one declares its arg const and the other doesn't -- the
4511 main variant of the arg type is all that matters. */
4512 if (TYPE_MAIN_VARIANT (TREE_VALUE (t1
))
4513 != TYPE_MAIN_VARIANT (TREE_VALUE (t2
)))
4515 return list_eq (TREE_CHAIN (t1
), TREE_CHAIN (t2
));
4518 /* If arg is a non-type template parameter that does not depend on template
4519 arguments, fold it like we weren't in the body of a template. */
4522 maybe_fold_nontype_arg (arg
)
4525 if (TREE_CODE_CLASS (TREE_CODE (arg
)) != 't'
4526 && !uses_template_parms (arg
))
4528 /* Sometimes, one of the args was an expression involving a
4529 template constant parameter, like N - 1. Now that we've
4530 tsubst'd, we might have something like 2 - 1. This will
4531 confuse lookup_template_class, so we do constant folding
4532 here. We have to unset processing_template_decl, to
4533 fool build_expr_from_tree() into building an actual
4536 int saved_processing_template_decl
= processing_template_decl
;
4537 processing_template_decl
= 0;
4538 arg
= fold (build_expr_from_tree (arg
));
4539 processing_template_decl
= saved_processing_template_decl
;
4544 /* Return the TREE_VEC with the arguments for the innermost template header,
4545 where ARGS is either that or the VEC of VECs for all the
4549 innermost_args (args
)
4552 return TMPL_ARGS_LEVEL (args
, TMPL_ARGS_DEPTH (args
));
4555 /* Substitute ARGS into the vector of template arguments T. */
4558 tsubst_template_arg_vector (t
, args
)
4562 int len
= TREE_VEC_LENGTH (t
), need_new
= 0, i
;
4563 tree
*elts
= (tree
*) alloca (len
* sizeof (tree
));
4565 bzero ((char *) elts
, len
* sizeof (tree
));
4567 for (i
= 0; i
< len
; i
++)
4569 if (TREE_VEC_ELT (t
, i
) != NULL_TREE
4570 && TREE_CODE (TREE_VEC_ELT (t
, i
)) == TREE_VEC
)
4571 elts
[i
] = tsubst_template_arg_vector (TREE_VEC_ELT (t
, i
), args
);
4573 elts
[i
] = maybe_fold_nontype_arg
4574 (tsubst_expr (TREE_VEC_ELT (t
, i
), args
, NULL_TREE
));
4576 if (elts
[i
] != TREE_VEC_ELT (t
, i
))
4583 t
= make_tree_vec (len
);
4584 for (i
= 0; i
< len
; i
++)
4585 TREE_VEC_ELT (t
, i
) = elts
[i
];
4590 /* Return the result of substituting ARGS into the template parameters
4591 given by PARMS. If there are m levels of ARGS and m + n levels of
4592 PARMS, then the result will contain n levels of PARMS. For
4593 example, if PARMS is `template <class T> template <class U>
4594 template <T*, U, class V>' and ARGS is {{int}, {double}} then the
4595 result will be `template <int*, double, class V>'. */
4598 tsubst_template_parms (parms
, args
)
4603 tree
* new_parms
= &r
;
4605 for (new_parms
= &r
;
4606 TMPL_PARMS_DEPTH (parms
) > TMPL_ARGS_DEPTH (args
);
4607 new_parms
= &(TREE_CHAIN (*new_parms
)),
4608 parms
= TREE_CHAIN (parms
))
4611 make_tree_vec (TREE_VEC_LENGTH (TREE_VALUE (parms
)));
4614 for (i
= 0; i
< TREE_VEC_LENGTH (new_vec
); ++i
)
4616 tree default_value
=
4617 TREE_PURPOSE (TREE_VEC_ELT (TREE_VALUE (parms
), i
));
4619 TREE_VALUE (TREE_VEC_ELT (TREE_VALUE (parms
), i
));
4621 TREE_VEC_ELT (new_vec
, i
)
4622 = build_tree_list (tsubst (default_value
, args
, NULL_TREE
),
4623 tsubst (parm_decl
, args
, NULL_TREE
));
4628 tree_cons (build_int_2 (0, (TMPL_PARMS_DEPTH (parms
)
4629 - TMPL_ARGS_DEPTH (args
))),
4630 new_vec
, NULL_TREE
);
4636 /* Substitute the ARGS into the indicated aggregate (or enumeration)
4637 type T. If T is not an aggregate or enumeration type, it is
4638 handled as if by tsubst. IN_DECL is as for tsubst. If
4639 ENTERING_SCOPE is non-zero, T is the context for a template which
4640 we are presently tsubst'ing. Return the subsituted value. */
4643 tsubst_aggr_type (t
, args
, in_decl
, entering_scope
)
4652 switch (TREE_CODE (t
))
4655 if (TYPE_PTRMEMFUNC_P (t
))
4657 tree r
= build_ptrmemfunc_type
4658 (tsubst (TYPE_PTRMEMFUNC_FN_TYPE (t
), args
, in_decl
));
4659 return cp_build_type_variant (r
, TYPE_READONLY (t
),
4663 /* else fall through */
4666 if (uses_template_parms (t
))
4672 /* First, determine the context for the type we are looking
4674 if (TYPE_CONTEXT (t
) != NULL_TREE
)
4675 context
= tsubst_aggr_type (TYPE_CONTEXT (t
), args
,
4676 in_decl
, /*entering_scope=*/1);
4678 context
= NULL_TREE
;
4680 /* Then, figure out what arguments are appropriate for the
4681 type we are trying to find. For example, given:
4683 template <class T> struct S;
4684 template <class T, class U> void f(T, U) { S<U> su; }
4686 and supposing that we are instantiating f<int, double>,
4687 then our ARGS will be {int, double}, but, when looking up
4688 S we only want {double}. */
4689 argvec
= tsubst (TYPE_TI_ARGS (t
), args
, in_decl
);
4691 r
= lookup_template_class (t
, argvec
, in_decl
, context
,
4694 return cp_build_type_variant (r
, TYPE_READONLY (t
),
4698 /* This is not a template type, so there's nothing to do. */
4702 return tsubst (t
, args
, in_decl
);
4706 /* Substitute the ARGS into the T, which is a _DECL. TYPE is the
4707 (already computed) substitution of ARGS into TREE_TYPE (T), if
4708 appropriate. Return the result of the substitution. IN_DECL is as
4712 tsubst_decl (t
, args
, type
, in_decl
)
4719 char* saved_filename
;
4722 /* Set the filename and linenumber to improve error-reporting. */
4723 saved_lineno
= lineno
;
4724 saved_filename
= input_filename
;
4725 lineno
= DECL_SOURCE_LINE (t
);
4726 input_filename
= DECL_SOURCE_FILE (t
);
4728 switch (TREE_CODE (t
))
4732 /* We can get here when processing a member template function
4733 of a template class. */
4734 tree decl
= DECL_TEMPLATE_RESULT (t
);
4736 int is_template_template_parm
= DECL_TEMPLATE_TEMPLATE_PARM_P (t
);
4738 if (!is_template_template_parm
)
4740 /* We might already have an instance of this template.
4741 The ARGS are for the surrounding class type, so the
4742 full args contain the tsubst'd args for the context,
4743 plus the innermost args from the template decl. */
4744 tree tmpl_args
= DECL_CLASS_TEMPLATE_P (t
)
4745 ? CLASSTYPE_TI_ARGS (TREE_TYPE (t
))
4746 : DECL_TI_ARGS (DECL_RESULT (t
));
4747 tree full_args
= tsubst (tmpl_args
, args
, in_decl
);
4749 /* tsubst_template_arg_vector doesn't copy the vector if
4750 nothing changed. But, *something* should have
4752 my_friendly_assert (full_args
!= tmpl_args
, 0);
4754 spec
= retrieve_specialization (t
, full_args
);
4755 if (spec
!= NULL_TREE
)
4762 /* Make a new template decl. It will be similar to the
4763 original, but will record the current template arguments.
4764 We also create a new function declaration, which is just
4765 like the old one, but points to this new template, rather
4766 than the old one. */
4769 my_friendly_assert (DECL_LANG_SPECIFIC (r
) != 0, 0);
4770 TREE_CHAIN (r
) = NULL_TREE
;
4772 if (is_template_template_parm
)
4774 tree new_decl
= tsubst (decl
, args
, in_decl
);
4775 DECL_RESULT (r
) = new_decl
;
4776 TREE_TYPE (r
) = TREE_TYPE (new_decl
);
4781 = tsubst_aggr_type (DECL_CONTEXT (t
), args
, in_decl
,
4782 /*entering_scope=*/1);
4783 DECL_CLASS_CONTEXT (r
)
4784 = tsubst_aggr_type (DECL_CLASS_CONTEXT (t
), args
, in_decl
,
4785 /*entering_scope=*/1);
4786 DECL_TEMPLATE_INFO (r
) = build_tree_list (t
, args
);
4788 if (TREE_CODE (decl
) == TYPE_DECL
)
4790 tree new_type
= tsubst (TREE_TYPE (t
), args
, in_decl
);
4791 TREE_TYPE (r
) = new_type
;
4792 CLASSTYPE_TI_TEMPLATE (new_type
) = r
;
4793 DECL_RESULT (r
) = TYPE_MAIN_DECL (new_type
);
4794 DECL_TI_ARGS (r
) = CLASSTYPE_TI_ARGS (new_type
);
4798 tree new_decl
= tsubst (decl
, args
, in_decl
);
4799 DECL_RESULT (r
) = new_decl
;
4800 DECL_TI_TEMPLATE (new_decl
) = r
;
4801 TREE_TYPE (r
) = TREE_TYPE (new_decl
);
4802 DECL_TI_ARGS (r
) = DECL_TI_ARGS (new_decl
);
4805 SET_DECL_IMPLICIT_INSTANTIATION (r
);
4806 DECL_TEMPLATE_INSTANTIATIONS (r
) = NULL_TREE
;
4807 DECL_TEMPLATE_SPECIALIZATIONS (r
) = NULL_TREE
;
4809 /* The template parameters for this new template are all the
4810 template parameters for the old template, except the
4811 outermost level of parameters. */
4812 DECL_TEMPLATE_PARMS (r
)
4813 = tsubst_template_parms (DECL_TEMPLATE_PARMS (t
), args
);
4815 if (PRIMARY_TEMPLATE_P (t
))
4816 DECL_PRIMARY_TEMPLATE (r
) = r
;
4818 /* We don't partially instantiate partial specializations. */
4819 if (TREE_CODE (decl
) == TYPE_DECL
)
4822 for (spec
= DECL_TEMPLATE_SPECIALIZATIONS (t
);
4824 spec
= TREE_CHAIN (spec
))
4826 /* It helps to consider example here. Consider:
4837 Now, for example, we are instantiating S<int>::f(U u).
4838 We want to make a template:
4843 It will have a specialization, for the case U = int*, of
4847 void S<int>::f<int*>(int*);
4849 This specialization will be an instantiation of
4850 the specialization given in the declaration of S, with
4851 argument list int*. */
4853 tree fn
= TREE_VALUE (spec
);
4857 if (!DECL_TEMPLATE_SPECIALIZATION (fn
))
4858 /* Instantiations are on the same list, but they're of
4859 no concern to us. */
4862 if (TREE_CODE (fn
) != TEMPLATE_DECL
)
4863 /* A full specialization. There's no need to record
4867 spec_args
= tsubst (DECL_TI_ARGS (fn
), args
, in_decl
);
4868 new_fn
= tsubst (DECL_RESULT (most_general_template (fn
)),
4869 spec_args
, in_decl
);
4870 DECL_TI_TEMPLATE (new_fn
) = fn
;
4871 register_specialization (new_fn
, r
,
4872 innermost_args (spec_args
));
4875 /* Record this partial instantiation. */
4876 register_specialization (r
, t
,
4877 DECL_TI_ARGS (DECL_RESULT (r
)));
4891 /* Nobody should be tsubst'ing into non-template functions. */
4892 my_friendly_assert (DECL_TEMPLATE_INFO (t
) != NULL_TREE
, 0);
4894 if (TREE_CODE (DECL_TI_TEMPLATE (t
)) == TEMPLATE_DECL
)
4898 /* Calculate the most general template of which R is a
4899 specialization, and the complete set of arguments used to
4901 gen_tmpl
= most_general_template (DECL_TI_TEMPLATE (t
));
4902 argvec
= tsubst (DECL_TI_ARGS (DECL_TEMPLATE_RESULT (gen_tmpl
)),
4905 /* Check to see if we already have this specialization. */
4906 spec
= retrieve_specialization (gen_tmpl
, argvec
);
4913 /* Here, we deal with the peculiar case:
4915 template <class T> struct S {
4916 template <class U> friend void f();
4918 template <class U> friend void f() {}
4920 template void f<double>();
4922 Here, the ARGS for the instantiation of will be {int,
4923 double}. But, we only need as many ARGS as there are
4924 levels of template parameters in CODE_PATTERN. We are
4925 careful not to get fooled into reducing the ARGS in
4928 template <class T> struct S { template <class U> void f(U); }
4929 template <class T> template <> void S<T>::f(int) {}
4931 which we can spot because the pattern will be a
4932 specialization in this case. */
4933 args_depth
= TMPL_ARGS_DEPTH (args
);
4935 TMPL_PARMS_DEPTH (DECL_TEMPLATE_PARMS (DECL_TI_TEMPLATE (t
)));
4936 if (args_depth
> parms_depth
4937 && !DECL_TEMPLATE_SPECIALIZATION (t
))
4939 my_friendly_assert (DECL_FRIEND_P (t
), 0);
4941 if (parms_depth
> 1)
4945 args
= make_temp_vec (parms_depth
);
4946 for (i
= 0; i
< parms_depth
; ++i
)
4947 TREE_VEC_ELT (args
, i
) =
4948 TREE_VEC_ELT (args
, i
+ (args_depth
- parms_depth
));
4951 args
= TREE_VEC_ELT (args
, args_depth
- parms_depth
);
4956 /* This special case arises when we have something like this:
4958 template <class T> struct S {
4959 friend void f<int>(int, double);
4962 Here, the DECL_TI_TEMPLATE for the friend declaration
4963 will be a LOOKUP_EXPR or an IDENTIFIER_NODE. We are
4964 being called from tsubst_friend_function, and we want
4965 only to create a new decl (R) with appropriate types so
4966 that we can call determine_specialization. */
4967 my_friendly_assert ((TREE_CODE (DECL_TI_TEMPLATE (t
))
4969 || (TREE_CODE (DECL_TI_TEMPLATE (t
))
4970 == IDENTIFIER_NODE
), 0);
4971 gen_tmpl
= NULL_TREE
;
4974 if (DECL_CLASS_SCOPE_P (t
))
4976 if (DECL_NAME (t
) == constructor_name (DECL_CONTEXT (t
)))
4980 ctx
= tsubst_aggr_type (DECL_CLASS_CONTEXT (t
), args
, t
,
4981 /*entering_scope=*/1);
4988 type
= tsubst (type
, args
, in_decl
);
4990 /* We do NOT check for matching decls pushed separately at this
4991 point, as they may not represent instantiations of this
4992 template, and in any case are considered separate under the
4993 discrete model. Instead, see add_maybe_template. */
4997 DECL_USE_TEMPLATE (r
) = 0;
4998 TREE_TYPE (r
) = type
;
5001 = tsubst_aggr_type (DECL_CONTEXT (t
), args
, t
, /*entering_scope=*/1);
5002 DECL_CLASS_CONTEXT (r
) = ctx
;
5004 if (member
&& !strncmp (OPERATOR_TYPENAME_FORMAT
,
5005 IDENTIFIER_POINTER (DECL_NAME (r
)),
5006 sizeof (OPERATOR_TYPENAME_FORMAT
) - 1))
5008 /* Type-conversion operator. Reconstruct the name, in
5009 case it's the name of one of the template's parameters. */
5010 DECL_NAME (r
) = build_typename_overload (TREE_TYPE (type
));
5013 DECL_ARGUMENTS (r
) = tsubst (DECL_ARGUMENTS (t
), args
, t
);
5014 DECL_MAIN_VARIANT (r
) = r
;
5015 DECL_RESULT (r
) = NULL_TREE
;
5016 DECL_INITIAL (r
) = NULL_TREE
;
5018 TREE_STATIC (r
) = 0;
5019 TREE_PUBLIC (r
) = TREE_PUBLIC (t
);
5020 DECL_EXTERNAL (r
) = 1;
5021 DECL_INTERFACE_KNOWN (r
) = 0;
5022 DECL_DEFER_OUTPUT (r
) = 0;
5023 TREE_CHAIN (r
) = NULL_TREE
;
5024 DECL_PENDING_INLINE_INFO (r
) = 0;
5027 if (DECL_CONSTRUCTOR_P (r
))
5029 maybe_retrofit_in_chrg (r
);
5030 grok_ctor_properties (ctx
, r
);
5032 if (IDENTIFIER_OPNAME_P (DECL_NAME (r
)))
5033 grok_op_properties (r
, DECL_VIRTUAL_P (r
), DECL_FRIEND_P (r
));
5035 /* Set up the DECL_TEMPLATE_INFO for R and compute its mangled
5036 name. There's no need to do this in the special friend
5037 case mentioned above where GEN_TMPL is NULL. */
5040 DECL_TEMPLATE_INFO (r
)
5041 = perm_tree_cons (gen_tmpl
, argvec
, NULL_TREE
);
5042 SET_DECL_IMPLICIT_INSTANTIATION (r
);
5043 register_specialization (r
, gen_tmpl
, argvec
);
5045 /* Set the mangled name for R. */
5046 if (DECL_DESTRUCTOR_P (t
))
5047 DECL_ASSEMBLER_NAME (r
) = build_destructor_name (ctx
);
5050 /* Instantiations of template functions must be mangled
5051 specially, in order to conform to 14.5.5.1
5052 [temp.over.link]. */
5053 tree tmpl
= DECL_TI_TEMPLATE (t
);
5055 /* TMPL will be NULL if this is a specialization of a
5056 member function of a template class. */
5057 if (name_mangling_version
< 1
5058 || tmpl
== NULL_TREE
5059 || (member
&& !is_member_template (tmpl
)
5060 && !DECL_TEMPLATE_INFO (tmpl
)))
5061 set_mangled_name_for_decl (r
);
5063 set_mangled_name_for_template_decl (r
);
5067 make_decl_rtl (r
, NULL_PTR
, 1);
5069 /* Like grokfndecl. If we don't do this, pushdecl will
5070 mess up our TREE_CHAIN because it doesn't find a
5071 previous decl. Sigh. */
5073 && (IDENTIFIER_GLOBAL_VALUE (DECL_ASSEMBLER_NAME (r
))
5075 SET_IDENTIFIER_GLOBAL_VALUE (DECL_ASSEMBLER_NAME (r
), r
);
5083 TREE_TYPE (r
) = type
;
5084 if (TREE_CODE (DECL_INITIAL (r
)) != TEMPLATE_PARM_INDEX
)
5085 DECL_INITIAL (r
) = TREE_TYPE (r
);
5087 DECL_INITIAL (r
) = tsubst (DECL_INITIAL (r
), args
, in_decl
);
5089 DECL_CONTEXT (r
) = NULL_TREE
;
5090 #ifdef PROMOTE_PROTOTYPES
5091 if ((TREE_CODE (type
) == INTEGER_TYPE
5092 || TREE_CODE (type
) == ENUMERAL_TYPE
)
5093 && TYPE_PRECISION (type
) < TYPE_PRECISION (integer_type_node
))
5094 DECL_ARG_TYPE (r
) = integer_type_node
;
5097 TREE_CHAIN (r
) = tsubst (TREE_CHAIN (t
), args
, TREE_CHAIN (t
));
5104 TREE_TYPE (r
) = type
;
5107 DECL_FIELD_CONTEXT (r
) = tsubst (DECL_FIELD_CONTEXT (t
), args
, in_decl
);
5109 DECL_INITIAL (r
) = tsubst_expr (DECL_INITIAL (t
), args
, in_decl
);
5110 TREE_CHAIN (r
) = NULL_TREE
;
5111 if (TREE_CODE (type
) == VOID_TYPE
)
5112 cp_error_at ("instantiation of `%D' as type void", r
);
5120 = tsubst_copy (DECL_INITIAL (t
), args
, in_decl
);
5121 TREE_CHAIN (r
) = NULL_TREE
;
5131 tree ctx
= tsubst_aggr_type (DECL_CONTEXT (t
), args
, in_decl
,
5132 /*entering_scope=*/1);
5134 /* Nobody should be tsubst'ing into non-template variables. */
5135 my_friendly_assert (DECL_LANG_SPECIFIC (t
)
5136 && DECL_TEMPLATE_INFO (t
) != NULL_TREE
, 0);
5138 /* Check to see if we already have this specialization. */
5139 tmpl
= DECL_TI_TEMPLATE (t
);
5140 gen_tmpl
= most_general_template (tmpl
);
5141 argvec
= tsubst (DECL_TI_ARGS (t
), args
, in_decl
);
5142 spec
= retrieve_specialization (gen_tmpl
, argvec
);
5151 TREE_TYPE (r
) = type
;
5152 DECL_CONTEXT (r
) = ctx
;
5153 if (TREE_STATIC (r
))
5154 DECL_ASSEMBLER_NAME (r
)
5155 = build_static_name (DECL_CONTEXT (r
), DECL_NAME (r
));
5157 /* Don't try to expand the initializer until someone tries to use
5158 this variable; otherwise we run into circular dependencies. */
5159 DECL_INITIAL (r
) = NULL_TREE
;
5163 DECL_CLASS_CONTEXT (r
) = DECL_CONTEXT (r
);
5165 DECL_TEMPLATE_INFO (r
) = perm_tree_cons (tmpl
, argvec
, NULL_TREE
);
5166 SET_DECL_IMPLICIT_INSTANTIATION (r
);
5167 register_specialization (r
, gen_tmpl
, argvec
);
5169 TREE_CHAIN (r
) = NULL_TREE
;
5170 if (TREE_CODE (type
) == VOID_TYPE
)
5171 cp_error_at ("instantiation of `%D' as type void", r
);
5176 if (t
== TYPE_NAME (TREE_TYPE (t
)))
5177 r
= TYPE_NAME (type
);
5181 TREE_TYPE (r
) = type
;
5182 DECL_CONTEXT (r
) = current_class_type
;
5183 TREE_CHAIN (r
) = NULL_TREE
;
5188 my_friendly_abort (0);
5191 /* Restore the file and line information. */
5192 lineno
= saved_lineno
;
5193 input_filename
= saved_filename
;
5199 /* Take the tree structure T and replace template parameters used therein
5200 with the argument vector ARGS. IN_DECL is an associated decl for
5203 tsubst is used for dealing with types, decls and the like; for
5204 expressions, use tsubst_expr or tsubst_copy. */
5207 tsubst (t
, args
, in_decl
)
5213 if (t
== NULL_TREE
|| t
== error_mark_node
5214 || t
== integer_type_node
5215 || t
== void_type_node
5216 || t
== char_type_node
5217 || TREE_CODE (t
) == NAMESPACE_DECL
)
5220 if (TREE_CODE (t
) == IDENTIFIER_NODE
)
5221 type
= IDENTIFIER_TYPE_VALUE (t
);
5223 type
= TREE_TYPE (t
);
5224 if (type
== unknown_type_node
)
5225 my_friendly_abort (42);
5227 if (type
&& TREE_CODE (t
) != FUNCTION_DECL
5228 && TREE_CODE (t
) != TYPENAME_TYPE
5229 && TREE_CODE (t
) != TEMPLATE_DECL
5230 && TREE_CODE (t
) != IDENTIFIER_NODE
)
5231 type
= tsubst (type
, args
, in_decl
);
5233 if (TREE_CODE_CLASS (TREE_CODE (t
)) == 'd')
5234 return tsubst_decl (t
, args
, type
, in_decl
);
5236 switch (TREE_CODE (t
))
5241 return tsubst_aggr_type (t
, args
, in_decl
, /*entering_scope=*/0);
5244 case IDENTIFIER_NODE
:
5256 if (t
== integer_type_node
)
5259 if (TREE_CODE (TYPE_MIN_VALUE (t
)) == INTEGER_CST
5260 && TREE_CODE (TYPE_MAX_VALUE (t
)) == INTEGER_CST
)
5264 tree max
= TREE_OPERAND (TYPE_MAX_VALUE (t
), 0);
5265 max
= tsubst_expr (max
, args
, in_decl
);
5266 if (processing_template_decl
)
5268 tree itype
= make_node (INTEGER_TYPE
);
5269 TYPE_MIN_VALUE (itype
) = size_zero_node
;
5270 TYPE_MAX_VALUE (itype
) = build_min (MINUS_EXPR
, sizetype
, max
,
5275 max
= fold (build_binary_op (MINUS_EXPR
, max
, integer_one_node
, 1));
5276 return build_index_2_type (size_zero_node
, max
);
5279 case TEMPLATE_TYPE_PARM
:
5280 case TEMPLATE_TEMPLATE_PARM
:
5281 case TEMPLATE_PARM_INDEX
:
5288 if (TREE_CODE (t
) == TEMPLATE_TYPE_PARM
5289 || TREE_CODE (t
) == TEMPLATE_TEMPLATE_PARM
)
5291 idx
= TEMPLATE_TYPE_IDX (t
);
5292 level
= TEMPLATE_TYPE_LEVEL (t
);
5296 idx
= TEMPLATE_PARM_IDX (t
);
5297 level
= TEMPLATE_PARM_LEVEL (t
);
5300 if (TREE_VEC_LENGTH (args
) > 0)
5302 tree arg
= NULL_TREE
;
5304 levels
= TMPL_ARGS_DEPTH (args
);
5305 if (level
<= levels
)
5306 arg
= TMPL_ARG (args
, level
, idx
);
5308 if (arg
!= NULL_TREE
)
5310 if (TREE_CODE (t
) == TEMPLATE_TYPE_PARM
)
5312 my_friendly_assert (TREE_CODE_CLASS (TREE_CODE (arg
))
5314 return cp_build_type_variant
5315 (arg
, TYPE_READONLY (arg
) || TYPE_READONLY (t
),
5316 TYPE_VOLATILE (arg
) || TYPE_VOLATILE (t
));
5318 else if (TREE_CODE (t
) == TEMPLATE_TEMPLATE_PARM
)
5320 if (CLASSTYPE_TEMPLATE_INFO (t
))
5322 /* We are processing a type constructed from
5323 a template template parameter */
5324 tree argvec
= tsubst (CLASSTYPE_TI_ARGS (t
),
5328 /* We can get a TEMPLATE_TEMPLATE_PARM here when
5329 we are resolving nested-types in the signature of
5330 a member function templates.
5331 Otherwise ARG is a TEMPLATE_DECL and is the real
5332 template to be instantiated. */
5333 if (TREE_CODE (arg
) == TEMPLATE_TEMPLATE_PARM
)
5334 arg
= TYPE_NAME (arg
);
5336 r
= lookup_template_class (DECL_NAME (arg
),
5339 /*entering_scope=*/0);
5340 return cp_build_type_variant (r
, TYPE_READONLY (t
),
5344 /* We are processing a template argument list. */
5353 /* This can happen during the attempted tsubst'ing in
5354 unify. This means that we don't yet have any information
5355 about the template parameter in question. */
5358 /* If we get here, we must have been looking at a parm for a
5359 more deeply nested template. Make a new version of this
5360 template parameter, but with a lower level. */
5361 switch (TREE_CODE (t
))
5363 case TEMPLATE_TYPE_PARM
:
5364 case TEMPLATE_TEMPLATE_PARM
:
5366 TEMPLATE_TYPE_PARM_INDEX (r
)
5367 = reduce_template_parm_level (TEMPLATE_TYPE_PARM_INDEX (t
),
5369 TYPE_STUB_DECL (r
) = TYPE_NAME (r
) = TEMPLATE_TYPE_DECL (r
);
5370 TYPE_MAIN_VARIANT (r
) = r
;
5371 TYPE_POINTER_TO (r
) = NULL_TREE
;
5372 TYPE_REFERENCE_TO (r
) = NULL_TREE
;
5374 if (TREE_CODE (t
) == TEMPLATE_TEMPLATE_PARM
5375 && CLASSTYPE_TEMPLATE_INFO (t
))
5377 tree argvec
= tsubst (CLASSTYPE_TI_ARGS (t
), args
, in_decl
);
5378 CLASSTYPE_TEMPLATE_INFO (r
)
5379 = perm_tree_cons (TYPE_NAME (t
), argvec
, NULL_TREE
);
5383 case TEMPLATE_PARM_INDEX
:
5384 r
= reduce_template_parm_level (t
, type
, levels
);
5388 my_friendly_abort (0);
5396 tree purpose
, value
, chain
, result
;
5397 int via_public
, via_virtual
, via_protected
;
5399 if (t
== void_list_node
)
5402 via_public
= TREE_VIA_PUBLIC (t
);
5403 via_protected
= TREE_VIA_PROTECTED (t
);
5404 via_virtual
= TREE_VIA_VIRTUAL (t
);
5406 purpose
= TREE_PURPOSE (t
);
5408 purpose
= tsubst (purpose
, args
, in_decl
);
5409 value
= TREE_VALUE (t
);
5411 value
= tsubst (value
, args
, in_decl
);
5412 chain
= TREE_CHAIN (t
);
5413 if (chain
&& chain
!= void_type_node
)
5414 chain
= tsubst (chain
, args
, in_decl
);
5415 if (purpose
== TREE_PURPOSE (t
)
5416 && value
== TREE_VALUE (t
)
5417 && chain
== TREE_CHAIN (t
))
5419 result
= hash_tree_cons (via_public
, via_virtual
, via_protected
,
5420 purpose
, value
, chain
);
5421 TREE_PARMLIST (result
) = TREE_PARMLIST (t
);
5425 if (type
!= NULL_TREE
)
5427 /* A binfo node. We always need to make a copy, of the node
5428 itself and of its BINFO_BASETYPES. */
5432 /* Make sure type isn't a typedef copy. */
5433 type
= BINFO_TYPE (TYPE_BINFO (type
));
5435 TREE_TYPE (t
) = complete_type (type
);
5436 if (IS_AGGR_TYPE (type
))
5438 BINFO_VTABLE (t
) = TYPE_BINFO_VTABLE (type
);
5439 BINFO_VIRTUALS (t
) = TYPE_BINFO_VIRTUALS (type
);
5440 if (TYPE_BINFO_BASETYPES (type
) != NULL_TREE
)
5441 BINFO_BASETYPES (t
) = copy_node (TYPE_BINFO_BASETYPES (type
));
5446 /* Otherwise, a vector of template arguments. */
5447 return tsubst_template_arg_vector (t
, args
);
5450 case REFERENCE_TYPE
:
5453 enum tree_code code
;
5455 if (type
== TREE_TYPE (t
))
5458 code
= TREE_CODE (t
);
5459 if (TREE_CODE (type
) == REFERENCE_TYPE
)
5461 static int last_line
= 0;
5462 static char* last_file
= 0;
5464 /* We keep track of the last time we issued this error
5465 message to avoid spewing a ton of messages during a
5466 single bad template instantiation. */
5467 if (last_line
!= lineno
||
5468 last_file
!= input_filename
)
5470 cp_error ("cannot form type %s to reference type %T during template instantiation",
5471 (code
== POINTER_TYPE
) ? "pointer" : "reference",
5474 last_file
= input_filename
;
5477 /* Use the underlying type in an attempt at error
5478 recovery; maybe the user meant vector<int> and wrote
5479 vector<int&>, or some such. */
5480 if (code
== REFERENCE_TYPE
)
5483 r
= build_pointer_type (TREE_TYPE (type
));
5485 else if (code
== POINTER_TYPE
)
5486 r
= build_pointer_type (type
);
5488 r
= build_reference_type (type
);
5489 r
= cp_build_type_variant (r
, TYPE_READONLY (t
), TYPE_VOLATILE (t
));
5491 /* Will this ever be needed for TYPE_..._TO values? */
5496 return build_offset_type
5497 (tsubst (TYPE_OFFSET_BASETYPE (t
), args
, in_decl
), type
);
5501 tree values
= TYPE_ARG_TYPES (t
);
5502 tree context
= TYPE_CONTEXT (t
);
5503 tree raises
= TYPE_RAISES_EXCEPTIONS (t
);
5506 /* Don't bother recursing if we know it won't change anything. */
5507 if (values
!= void_list_node
)
5509 /* This should probably be rewritten to use hash_tree_cons for
5510 the memory savings. */
5511 tree first
= NULL_TREE
;
5512 tree last
= NULL_TREE
;
5514 for (; values
&& values
!= void_list_node
;
5515 values
= TREE_CHAIN (values
))
5517 tree value
= TYPE_MAIN_VARIANT (type_decays_to
5518 (tsubst (TREE_VALUE (values
), args
, in_decl
)));
5519 /* Don't instantiate default args unless they are used.
5520 Handle it in build_over_call instead. */
5521 tree purpose
= TREE_PURPOSE (values
);
5522 tree x
= build_tree_list (purpose
, value
);
5525 TREE_CHAIN (last
) = x
;
5531 if (values
== void_list_node
)
5532 TREE_CHAIN (last
) = void_list_node
;
5537 context
= tsubst (context
, args
, in_decl
);
5538 /* Could also optimize cases where return value and
5539 values have common elements (e.g., T min(const &T, const T&). */
5541 /* If the above parameters haven't changed, just return the type. */
5542 if (type
== TREE_TYPE (t
)
5543 && values
== TYPE_VALUES (t
)
5544 && context
== TYPE_CONTEXT (t
))
5547 /* Construct a new type node and return it. */
5548 if (TREE_CODE (t
) == FUNCTION_TYPE
5549 && context
== NULL_TREE
)
5551 fntype
= build_function_type (type
, values
);
5553 else if (context
== NULL_TREE
)
5555 tree base
= tsubst (TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (t
))),
5557 fntype
= build_cplus_method_type (base
, type
,
5558 TREE_CHAIN (values
));
5562 fntype
= make_node (TREE_CODE (t
));
5563 TREE_TYPE (fntype
) = type
;
5564 TYPE_CONTEXT (fntype
) = FROB_CONTEXT (context
);
5565 TYPE_VALUES (fntype
) = values
;
5566 TYPE_SIZE (fntype
) = TYPE_SIZE (t
);
5567 TYPE_ALIGN (fntype
) = TYPE_ALIGN (t
);
5568 TYPE_MODE (fntype
) = TYPE_MODE (t
);
5569 if (TYPE_METHOD_BASETYPE (t
))
5570 TYPE_METHOD_BASETYPE (fntype
) = tsubst (TYPE_METHOD_BASETYPE (t
),
5572 /* Need to generate hash value. */
5573 my_friendly_abort (84);
5575 fntype
= build_type_variant (fntype
,
5580 raises
= tsubst (raises
, args
, in_decl
);
5581 fntype
= build_exception_variant (fntype
, raises
);
5587 tree domain
= tsubst (TYPE_DOMAIN (t
), args
, in_decl
);
5589 if (type
== TREE_TYPE (t
) && domain
== TYPE_DOMAIN (t
))
5591 r
= build_cplus_array_type (type
, domain
);
5597 return fold (build (TREE_CODE (t
), TREE_TYPE (t
),
5598 tsubst (TREE_OPERAND (t
, 0), args
, in_decl
),
5599 tsubst (TREE_OPERAND (t
, 1), args
, in_decl
)));
5603 return fold (build1 (TREE_CODE (t
), TREE_TYPE (t
),
5604 tsubst (TREE_OPERAND (t
, 0), args
, in_decl
)));
5608 tree ctx
= tsubst_aggr_type (TYPE_CONTEXT (t
), args
, in_decl
,
5609 /*entering_scope=*/1);
5610 tree f
= tsubst_copy (TYPENAME_TYPE_FULLNAME (t
), args
, in_decl
);
5612 /* Normally, make_typename_type does not require that the CTX
5613 have complete type in order to allow things like:
5615 template <class T> struct S { typename S<T>::X Y; };
5617 But, such constructs have already been resolved by this
5618 point, so here CTX really should have complete type, unless
5619 it's a partial instantiation. */
5620 if (!uses_template_parms (ctx
)
5621 && !complete_type_or_else (ctx
))
5622 return error_mark_node
;
5624 f
= make_typename_type (ctx
, f
);
5625 return cp_build_type_variant
5626 (f
, TYPE_READONLY (f
) || TYPE_READONLY (t
),
5627 TYPE_VOLATILE (f
) || TYPE_VOLATILE (t
));
5631 return make_pointer_declarator
5632 (type
, tsubst (TREE_OPERAND (t
, 0), args
, in_decl
));
5635 return make_reference_declarator
5636 (type
, tsubst (TREE_OPERAND (t
, 0), args
, in_decl
));
5639 return build_parse_node
5640 (ARRAY_REF
, tsubst (TREE_OPERAND (t
, 0), args
, in_decl
),
5641 tsubst_expr (TREE_OPERAND (t
, 1), args
, in_decl
));
5644 return make_call_declarator
5645 (tsubst (TREE_OPERAND (t
, 0), args
, in_decl
),
5646 tsubst (TREE_OPERAND (t
, 1), args
, in_decl
),
5647 TREE_OPERAND (t
, 2),
5648 tsubst (TREE_TYPE (t
), args
, in_decl
));
5651 return build_parse_node
5652 (TREE_CODE (t
), tsubst (TREE_OPERAND (t
, 0), args
, in_decl
),
5653 tsubst (TREE_OPERAND (t
, 1), args
, in_decl
));
5656 sorry ("use of `%s' in template",
5657 tree_code_name
[(int) TREE_CODE (t
)]);
5658 return error_mark_node
;
5665 emit_line_note (input_filename
, lineno
);
5669 expand_start_bindings (0);
5676 int saved_warn_unused
= 0;
5678 if (processing_template_decl
)
5680 saved_warn_unused
= warn_unused
;
5683 expand_end_bindings (getdecls (), kept_level_p (), 0);
5684 if (processing_template_decl
)
5685 warn_unused
= saved_warn_unused
;
5686 t
= poplevel (kept_level_p (), 1, 0);
5691 /* Like tsubst, but deals with expressions. This function just replaces
5692 template parms; to finish processing the resultant expression, use
5696 tsubst_copy (t
, args
, in_decl
)
5700 enum tree_code code
;
5702 if (t
== NULL_TREE
|| t
== error_mark_node
)
5705 code
= TREE_CODE (t
);
5710 return do_identifier (DECL_NAME (t
), 0, NULL_TREE
);
5717 if (!DECL_CONTEXT (t
))
5718 /* This is a global enumeration constant. */
5721 /* Unfortunately, we cannot just call lookup_name here.
5724 template <int I> int f() {
5726 struct S { void g() { E e = a; } };
5729 When we instantiate f<7>::S::g(), say, lookup_name is not
5730 clever enough to find f<7>::a. */
5732 = tsubst_aggr_type (TREE_TYPE (t
), args
, in_decl
,
5733 /*entering_scope=*/0);
5735 for (v
= TYPE_VALUES (enum_type
);
5738 if (TREE_PURPOSE (v
) == DECL_NAME (t
))
5739 return TREE_VALUE (v
);
5741 /* We didn't find the name. That should never happen; if
5742 name-lookup found it during preliminary parsing, we
5743 should find it again here during instantiation. */
5744 my_friendly_abort (0);
5749 if (DECL_CONTEXT (t
))
5753 ctx
= tsubst_aggr_type (DECL_CONTEXT (t
), args
, in_decl
,
5754 /*entering_scope=*/1);
5755 if (ctx
!= DECL_CONTEXT (t
))
5756 return lookup_field (ctx
, DECL_NAME (t
), 0, 0);
5762 if (DECL_LANG_SPECIFIC (t
) && DECL_TEMPLATE_INFO (t
))
5763 t
= tsubst (t
, args
, in_decl
);
5768 if (is_member_template (t
))
5769 return tsubst (t
, args
, in_decl
);
5775 /* We must tsbust into a LOOKUP_EXPR in case the names to
5776 which it refers is a conversion operator; in that case the
5777 name will change. We avoid making unnecessary copies,
5780 tree id
= tsubst_copy (TREE_OPERAND (t
, 0), args
, in_decl
);
5782 if (id
!= TREE_OPERAND (t
, 0))
5784 tree r
= build_nt (LOOKUP_EXPR
, id
);
5785 LOOKUP_EXPR_GLOBAL (r
) = LOOKUP_EXPR_GLOBAL (t
);
5793 case REINTERPRET_CAST_EXPR
:
5794 case CONST_CAST_EXPR
:
5795 case STATIC_CAST_EXPR
:
5796 case DYNAMIC_CAST_EXPR
:
5798 (code
, tsubst (TREE_TYPE (t
), args
, in_decl
),
5799 tsubst_copy (TREE_OPERAND (t
, 0), args
, in_decl
));
5802 case PREDECREMENT_EXPR
:
5803 case PREINCREMENT_EXPR
:
5804 case POSTDECREMENT_EXPR
:
5805 case POSTINCREMENT_EXPR
:
5807 case TRUTH_NOT_EXPR
:
5810 case CONVERT_EXPR
: /* Unary + */
5818 tsubst_copy (TREE_OPERAND (t
, 0), args
, in_decl
));
5823 case TRUNC_DIV_EXPR
:
5825 case FLOOR_DIV_EXPR
:
5826 case ROUND_DIV_EXPR
:
5827 case EXACT_DIV_EXPR
:
5829 case BIT_ANDTC_EXPR
:
5832 case TRUNC_MOD_EXPR
:
5833 case FLOOR_MOD_EXPR
:
5834 case TRUTH_ANDIF_EXPR
:
5835 case TRUTH_ORIF_EXPR
:
5836 case TRUTH_AND_EXPR
:
5857 (code
, tsubst_copy (TREE_OPERAND (t
, 0), args
, in_decl
),
5858 tsubst_copy (TREE_OPERAND (t
, 1), args
, in_decl
));
5862 tree fn
= TREE_OPERAND (t
, 0);
5863 if (is_overloaded_fn (fn
))
5864 fn
= tsubst_copy (get_first_fn (fn
), args
, in_decl
);
5866 /* Sometimes FN is a LOOKUP_EXPR. */
5867 fn
= tsubst_copy (fn
, args
, in_decl
);
5869 (code
, fn
, tsubst_copy (TREE_OPERAND (t
, 1), args
, in_decl
),
5873 case METHOD_CALL_EXPR
:
5875 tree name
= TREE_OPERAND (t
, 0);
5876 if (TREE_CODE (name
) == BIT_NOT_EXPR
)
5878 name
= tsubst_copy (TREE_OPERAND (name
, 0), args
, in_decl
);
5879 name
= build1 (BIT_NOT_EXPR
, NULL_TREE
, name
);
5881 else if (TREE_CODE (name
) == SCOPE_REF
5882 && TREE_CODE (TREE_OPERAND (name
, 1)) == BIT_NOT_EXPR
)
5884 tree base
= tsubst_copy (TREE_OPERAND (name
, 0), args
, in_decl
);
5885 name
= TREE_OPERAND (name
, 1);
5886 name
= tsubst_copy (TREE_OPERAND (name
, 0), args
, in_decl
);
5887 name
= build1 (BIT_NOT_EXPR
, NULL_TREE
, name
);
5888 name
= build_nt (SCOPE_REF
, base
, name
);
5891 name
= tsubst_copy (TREE_OPERAND (t
, 0), args
, in_decl
);
5893 (code
, name
, tsubst_copy (TREE_OPERAND (t
, 1), args
, in_decl
),
5894 tsubst_copy (TREE_OPERAND (t
, 2), args
, in_decl
),
5903 (code
, tsubst_copy (TREE_OPERAND (t
, 0), args
, in_decl
),
5904 tsubst_copy (TREE_OPERAND (t
, 1), args
, in_decl
),
5905 tsubst_copy (TREE_OPERAND (t
, 2), args
, in_decl
));
5907 if (code
== BIND_EXPR
&& !processing_template_decl
)
5909 /* This processing should really occur in tsubst_expr,
5910 However, tsubst_expr does not recurse into expressions,
5911 since it assumes that there aren't any statements
5912 inside them. Instead, it simply calls
5913 build_expr_from_tree. So, we need to expand the
5915 tree rtl_expr
= begin_stmt_expr ();
5916 tree block
= tsubst_expr (TREE_OPERAND (r
, 1), args
, in_decl
);
5917 r
= finish_stmt_expr (rtl_expr
, block
);
5926 (code
, tsubst_copy (TREE_OPERAND (t
, 0), args
, in_decl
),
5927 tsubst_copy (TREE_OPERAND (t
, 1), args
, in_decl
),
5928 tsubst_copy (TREE_OPERAND (t
, 2), args
, in_decl
));
5929 NEW_EXPR_USE_GLOBAL (r
) = NEW_EXPR_USE_GLOBAL (t
);
5936 (code
, tsubst_copy (TREE_OPERAND (t
, 0), args
, in_decl
),
5937 tsubst_copy (TREE_OPERAND (t
, 1), args
, in_decl
));
5938 DELETE_EXPR_USE_GLOBAL (r
) = DELETE_EXPR_USE_GLOBAL (t
);
5939 DELETE_EXPR_USE_VEC (r
) = DELETE_EXPR_USE_VEC (t
);
5943 case TEMPLATE_ID_EXPR
:
5945 /* Substituted template arguments */
5946 tree targs
= tsubst_copy (TREE_OPERAND (t
, 1), args
, in_decl
);
5948 for (chain
= targs
; chain
; chain
= TREE_CHAIN (chain
))
5949 TREE_VALUE (chain
) = maybe_fold_nontype_arg (TREE_VALUE (chain
));
5951 return lookup_template_function
5952 (tsubst_copy (TREE_OPERAND (t
, 0), args
, in_decl
), targs
);
5957 tree purpose
, value
, chain
;
5959 if (t
== void_list_node
)
5962 purpose
= TREE_PURPOSE (t
);
5964 purpose
= tsubst_copy (purpose
, args
, in_decl
);
5965 value
= TREE_VALUE (t
);
5967 value
= tsubst_copy (value
, args
, in_decl
);
5968 chain
= TREE_CHAIN (t
);
5969 if (chain
&& chain
!= void_type_node
)
5970 chain
= tsubst_copy (chain
, args
, in_decl
);
5971 if (purpose
== TREE_PURPOSE (t
)
5972 && value
== TREE_VALUE (t
)
5973 && chain
== TREE_CHAIN (t
))
5975 return tree_cons (purpose
, value
, chain
);
5982 case TEMPLATE_TYPE_PARM
:
5983 case TEMPLATE_TEMPLATE_PARM
:
5984 case TEMPLATE_PARM_INDEX
:
5986 case REFERENCE_TYPE
:
5993 return tsubst (t
, args
, in_decl
);
5995 case IDENTIFIER_NODE
:
5996 if (IDENTIFIER_TYPENAME_P (t
)
5997 /* Make sure it's not just a variable named `__opr', for instance,
5998 which can occur in some existing code. */
6000 return build_typename_overload
6001 (tsubst (TREE_TYPE (t
), args
, in_decl
));
6007 (CONSTRUCTOR
, tsubst (TREE_TYPE (t
), args
, in_decl
), NULL_TREE
,
6008 tsubst_copy (CONSTRUCTOR_ELTS (t
), args
, in_decl
));
6015 /* Like tsubst_copy, but also does semantic processing and RTL expansion. */
6018 tsubst_expr (t
, args
, in_decl
)
6022 if (t
== NULL_TREE
|| t
== error_mark_node
)
6025 if (processing_template_decl
)
6026 return tsubst_copy (t
, args
, in_decl
);
6028 switch (TREE_CODE (t
))
6031 lineno
= TREE_COMPLEXITY (t
);
6032 finish_return_stmt (tsubst_expr (RETURN_EXPR (t
),
6037 lineno
= TREE_COMPLEXITY (t
);
6038 finish_expr_stmt (tsubst_expr (EXPR_STMT_EXPR (t
),
6044 int i
= suspend_momentary ();
6047 lineno
= TREE_COMPLEXITY (t
);
6048 emit_line_note (input_filename
, lineno
);
6050 (tsubst (TREE_OPERAND (t
, 0), args
, in_decl
),
6051 tsubst (TREE_OPERAND (t
, 1), args
, in_decl
),
6052 TREE_OPERAND (t
, 2) != 0, NULL_TREE
, NULL_TREE
);
6053 init
= tsubst_expr (TREE_OPERAND (t
, 2), args
, in_decl
);
6055 (dcl
, init
, NULL_TREE
, 1, /*init ? LOOKUP_ONLYCONVERTING :*/ 0);
6056 resume_momentary (i
);
6063 lineno
= TREE_COMPLEXITY (t
);
6066 for (tmp
= FOR_INIT_STMT (t
); tmp
; tmp
= TREE_CHAIN (tmp
))
6067 tsubst_expr (tmp
, args
, in_decl
);
6068 finish_for_init_stmt (NULL_TREE
);
6069 finish_for_cond (tsubst_expr (FOR_COND (t
), args
,
6072 tmp
= tsubst_expr (FOR_EXPR (t
), args
, in_decl
);
6073 finish_for_expr (tmp
, NULL_TREE
);
6074 tsubst_expr (FOR_BODY (t
), args
, in_decl
);
6075 finish_for_stmt (tmp
, NULL_TREE
);
6081 lineno
= TREE_COMPLEXITY (t
);
6082 begin_while_stmt ();
6083 finish_while_stmt_cond (tsubst_expr (WHILE_COND (t
),
6086 tsubst_expr (WHILE_BODY (t
), args
, in_decl
);
6087 finish_while_stmt (NULL_TREE
);
6093 lineno
= TREE_COMPLEXITY (t
);
6095 tsubst_expr (DO_BODY (t
), args
, in_decl
);
6096 finish_do_body (NULL_TREE
);
6097 finish_do_stmt (tsubst_expr (DO_COND (t
), args
,
6107 lineno
= TREE_COMPLEXITY (t
);
6109 finish_if_stmt_cond (tsubst_expr (IF_COND (t
),
6113 if (tmp
= THEN_CLAUSE (t
), tmp
)
6115 tsubst_expr (tmp
, args
, in_decl
);
6116 finish_then_clause (NULL_TREE
);
6119 if (tmp
= ELSE_CLAUSE (t
), tmp
)
6121 begin_else_clause ();
6122 tsubst_expr (tmp
, args
, in_decl
);
6123 finish_else_clause (NULL_TREE
);
6134 lineno
= TREE_COMPLEXITY (t
);
6135 begin_compound_stmt (COMPOUND_STMT_NO_SCOPE (t
));
6136 for (substmt
= COMPOUND_BODY (t
);
6137 substmt
!= NULL_TREE
;
6138 substmt
= TREE_CHAIN (substmt
))
6139 tsubst_expr (substmt
, args
, in_decl
);
6140 return finish_compound_stmt (COMPOUND_STMT_NO_SCOPE (t
),
6146 lineno
= TREE_COMPLEXITY (t
);
6147 finish_break_stmt ();
6151 lineno
= TREE_COMPLEXITY (t
);
6152 finish_continue_stmt ();
6159 lineno
= TREE_COMPLEXITY (t
);
6160 begin_switch_stmt ();
6161 val
= tsubst_expr (SWITCH_COND (t
), args
, in_decl
);
6162 finish_switch_cond (val
);
6164 if (tmp
= TREE_OPERAND (t
, 1), tmp
)
6165 tsubst_expr (tmp
, args
, in_decl
);
6167 finish_switch_stmt (val
, NULL_TREE
);
6172 finish_case_label (tsubst_expr (CASE_LOW (t
), args
, in_decl
),
6173 tsubst_expr (CASE_HIGH (t
), args
, in_decl
));
6177 t
= define_label (DECL_SOURCE_FILE (t
), DECL_SOURCE_LINE (t
),
6184 lineno
= TREE_COMPLEXITY (t
);
6185 t
= GOTO_DESTINATION (t
);
6186 if (TREE_CODE (t
) != IDENTIFIER_NODE
)
6187 /* Computed goto's must be tsubst'd into. On the other hand,
6188 non-computed gotos must not be; the identifier in question
6189 will have no binding. */
6190 t
= tsubst_expr (t
, args
, in_decl
);
6191 finish_goto_stmt (t
);
6195 lineno
= TREE_COMPLEXITY (t
);
6196 finish_asm_stmt (tsubst_expr (ASM_CV_QUAL (t
), args
, in_decl
),
6197 tsubst_expr (ASM_STRING (t
), args
, in_decl
),
6198 tsubst_expr (ASM_OUTPUTS (t
), args
, in_decl
),
6199 tsubst_expr (ASM_INPUTS (t
), args
, in_decl
),
6200 tsubst_expr (ASM_CLOBBERS (t
), args
, in_decl
));
6204 lineno
= TREE_COMPLEXITY (t
);
6206 tsubst_expr (TRY_STMTS (t
), args
, in_decl
);
6207 finish_try_block (NULL_TREE
);
6209 tree handler
= TRY_HANDLERS (t
);
6210 for (; handler
; handler
= TREE_CHAIN (handler
))
6211 tsubst_expr (handler
, args
, in_decl
);
6213 finish_handler_sequence (NULL_TREE
);
6217 lineno
= TREE_COMPLEXITY (t
);
6219 if (HANDLER_PARMS (t
))
6221 tree d
= HANDLER_PARMS (t
);
6222 expand_start_catch_block
6223 (tsubst (TREE_OPERAND (d
, 1), args
, in_decl
),
6224 tsubst (TREE_OPERAND (d
, 0), args
, in_decl
));
6227 expand_start_catch_block (NULL_TREE
, NULL_TREE
);
6228 finish_handler_parms (NULL_TREE
);
6229 tsubst_expr (HANDLER_BODY (t
), args
, in_decl
);
6230 finish_handler (NULL_TREE
);
6234 lineno
= TREE_COMPLEXITY (t
);
6236 if (TREE_CODE (t
) == ENUMERAL_TYPE
)
6237 tsubst (t
, args
, NULL_TREE
);
6241 return build_expr_from_tree (tsubst_copy (t
, args
, in_decl
));
6246 /* Instantiate the indicated variable of function template TMPL with
6247 the template arguments in TARG_PTR. */
6250 instantiate_template (tmpl
, targ_ptr
)
6251 tree tmpl
, targ_ptr
;
6257 struct obstack
*old_fmp_obstack
;
6258 extern struct obstack
*function_maybepermanent_obstack
;
6261 if (tmpl
== error_mark_node
)
6262 return error_mark_node
;
6264 my_friendly_assert (TREE_CODE (tmpl
) == TEMPLATE_DECL
, 283);
6266 /* Check to see if we already have this specialization. */
6267 spec
= retrieve_specialization (tmpl
, targ_ptr
);
6268 if (spec
!= NULL_TREE
)
6271 if (DECL_TEMPLATE_INFO (tmpl
))
6273 /* The TMPL is a partial instantiation. To get a full set of
6274 arguments we must add the arguments used to perform the
6275 partial instantiation. */
6276 targ_ptr
= add_outermost_template_args (DECL_TI_ARGS (tmpl
),
6278 gen_tmpl
= most_general_template (tmpl
);
6280 /* Check to see if we already have this specialization. */
6281 spec
= retrieve_specialization (gen_tmpl
, targ_ptr
);
6282 if (spec
!= NULL_TREE
)
6288 push_obstacks (&permanent_obstack
, &permanent_obstack
);
6289 old_fmp_obstack
= function_maybepermanent_obstack
;
6290 function_maybepermanent_obstack
= &permanent_obstack
;
6292 len
= DECL_NTPARMS (gen_tmpl
);
6293 inner_args
= innermost_args (targ_ptr
);
6297 tree t
= TREE_VEC_ELT (inner_args
, i
);
6298 if (TREE_CODE_CLASS (TREE_CODE (t
)) == 't')
6300 tree nt
= target_type (t
);
6301 if (IS_AGGR_TYPE (nt
) && decl_function_context (TYPE_MAIN_DECL (nt
)))
6303 cp_error ("type `%T' composed from a local class is not a valid template-argument", t
);
6304 cp_error (" trying to instantiate `%D'", gen_tmpl
);
6305 fndecl
= error_mark_node
;
6310 targ_ptr
= copy_to_permanent (targ_ptr
);
6312 /* substitute template parameters */
6313 fndecl
= tsubst (DECL_RESULT (gen_tmpl
), targ_ptr
, gen_tmpl
);
6314 /* The DECL_TI_TEMPLATE should always be the immediate parent
6315 template, not the most general template. */
6316 DECL_TI_TEMPLATE (fndecl
) = tmpl
;
6318 if (flag_external_templates
)
6319 add_pending_template (fndecl
);
6322 function_maybepermanent_obstack
= old_fmp_obstack
;
6328 /* Push the name of the class template into the scope of the instantiation. */
6331 overload_template_name (type
)
6334 tree id
= DECL_NAME (CLASSTYPE_TI_TEMPLATE (type
));
6337 if (IDENTIFIER_CLASS_VALUE (id
)
6338 && TREE_TYPE (IDENTIFIER_CLASS_VALUE (id
)) == type
)
6341 decl
= build_decl (TYPE_DECL
, id
, type
);
6342 SET_DECL_ARTIFICIAL (decl
);
6343 pushdecl_class_level (decl
);
6346 /* Like type_unification but designed specially to handle conversion
6349 The FN is a TEMPLATE_DECL for a function. The ARGS are the
6350 arguments that are being used when calling it.
6352 If FN is a conversion operator, RETURN_TYPE is the type desired as
6353 the result of the conversion operator.
6355 The EXTRA_FN_ARG, if any, is the type of an additional
6356 parameter to be added to the beginning of FN's parameter list.
6358 The other arguments are as for type_unification. */
6361 fn_type_unification (fn
, explicit_targs
, targs
, args
, return_type
,
6362 strict
, extra_fn_arg
)
6363 tree fn
, explicit_targs
, targs
, args
, return_type
;
6364 unification_kind_t strict
;
6369 my_friendly_assert (TREE_CODE (fn
) == TEMPLATE_DECL
, 0);
6371 parms
= TYPE_ARG_TYPES (TREE_TYPE (fn
));
6373 if (IDENTIFIER_TYPENAME_P (DECL_NAME (fn
)))
6375 /* This is a template conversion operator. Use the return types
6376 as well as the argument types. */
6377 parms
= scratch_tree_cons (NULL_TREE
,
6378 TREE_TYPE (TREE_TYPE (fn
)),
6380 args
= scratch_tree_cons (NULL_TREE
, return_type
, args
);
6383 if (extra_fn_arg
!= NULL_TREE
)
6384 parms
= scratch_tree_cons (NULL_TREE
, extra_fn_arg
, parms
);
6386 /* We allow incomplete unification without an error message here
6387 because the standard doesn't seem to explicitly prohibit it. Our
6388 callers must be ready to deal with unification failures in any
6390 return type_unification (DECL_INNERMOST_TEMPLATE_PARMS (fn
),
6399 /* Type unification.
6401 We have a function template signature with one or more references to
6402 template parameters, and a parameter list we wish to fit to this
6403 template. If possible, produce a list of parameters for the template
6404 which will cause it to fit the supplied parameter list.
6406 Return zero for success, 2 for an incomplete match that doesn't resolve
6407 all the types, and 1 for complete failure. An error message will be
6408 printed only for an incomplete match.
6410 TPARMS[NTPARMS] is an array of template parameter types.
6412 TARGS[NTPARMS] is the array into which the deduced template
6413 parameter values are placed. PARMS is the function template's
6414 signature (using TEMPLATE_PARM_IDX nodes), and ARGS is the argument
6415 list we're trying to match against it.
6417 The EXPLICIT_TARGS are explicit template arguments provided via a
6420 The parameter STRICT is one of:
6423 We are deducing arguments for a function call, as in
6427 We are deducing arguments for a conversion function, as in
6431 We are deducing arguments when calculating the partial
6432 ordering between specializations of function or class
6433 templates, as in [temp.func.order] and [temp.class.order],
6434 when doing an explicit instantiation as in [temp.explicit],
6435 when determining an explicit specialization as in
6436 [temp.expl.spec], or when taking the address of a function
6437 template, as in [temp.deduct.funcaddr]. */
6440 type_unification (tparms
, targs
, parms
, args
, explicit_targs
,
6441 strict
, allow_incomplete
)
6442 tree tparms
, targs
, parms
, args
, explicit_targs
;
6443 unification_kind_t strict
;
6444 int allow_incomplete
;
6449 for (i
= 0; i
< TREE_VEC_LENGTH (tparms
); i
++)
6450 TREE_VEC_ELT (targs
, i
) = NULL_TREE
;
6452 if (explicit_targs
!= NULL_TREE
)
6455 arg_vec
= coerce_template_parms (tparms
, explicit_targs
, NULL_TREE
, 0,
6458 if (arg_vec
== error_mark_node
)
6461 explicit_mask
= alloca (sizeof (int) * TREE_VEC_LENGTH (targs
));
6462 bzero ((char *) explicit_mask
, sizeof(int) * TREE_VEC_LENGTH (targs
));
6465 i
< TREE_VEC_LENGTH (arg_vec
)
6466 && TREE_VEC_ELT (arg_vec
, i
) != NULL_TREE
;
6469 TREE_VEC_ELT (targs
, i
) = TREE_VEC_ELT (arg_vec
, i
);
6470 /* Let unify know that this argument was explicit. */
6471 explicit_mask
[i
] = 1;
6478 type_unification_real (tparms
, targs
, parms
, args
, 0,
6479 strict
, allow_incomplete
, explicit_mask
);
6482 /* Adjust types before performing type deduction, as described in
6483 [temp.deduct.call] and [temp.deduct.conv]. The rules in these two
6484 sections are symmetric. PARM is the type of a function parameter
6485 or the return type of the conversion function. ARG is the type of
6486 the argument passed to the call, or the type of the value
6487 intialized with the result of the conversion function. */
6490 maybe_adjust_types_for_deduction (strict
, parm
, arg
)
6491 unification_kind_t strict
;
6502 /* Swap PARM and ARG throughout the remainder of this
6503 function; the handling is precisely symmetric since PARM
6504 will initialize ARG rather than vice versa. */
6512 /* There is nothing to do in this case. */
6516 my_friendly_abort (0);
6519 if (TREE_CODE (*parm
) != REFERENCE_TYPE
)
6521 /* [temp.deduct.call]
6523 If P is not a reference type:
6525 --If A is an array type, the pointer type produced by the
6526 array-to-pointer standard conversion (_conv.array_) is
6527 used in place of A for type deduction; otherwise,
6529 --If A is a function type, the pointer type produced by
6530 the function-to-pointer standard conversion
6531 (_conv.func_) is used in place of A for type deduction;
6534 --If A is a cv-qualified type, the top level
6535 cv-qualifiers of A's type are ignored for type
6537 if (TREE_CODE (*arg
) == ARRAY_TYPE
)
6538 *arg
= build_pointer_type (TREE_TYPE (*arg
));
6539 else if (TREE_CODE (*arg
) == FUNCTION_TYPE
6540 || TREE_CODE (*arg
) == METHOD_TYPE
)
6541 *arg
= build_pointer_type (*arg
);
6543 *arg
= TYPE_MAIN_VARIANT (*arg
);
6546 /* [temp.deduct.call]
6548 If P is a cv-qualified type, the top level cv-qualifiers
6549 of P's type are ignored for type deduction. If P is a
6550 reference type, the type referred to by P is used for
6552 *parm
= TYPE_MAIN_VARIANT (*parm
);
6553 if (TREE_CODE (*parm
) == REFERENCE_TYPE
)
6554 *parm
= TREE_TYPE (*parm
);
6557 /* Like type_unfication. EXPLICIT_MASK, if non-NULL, is an array of
6558 integers, with ones in positions corresponding to arguments in
6559 targs that were provided explicitly, and zeros elsewhere.
6561 If SUBR is 1, we're being called recursively (to unify the
6562 arguments of a function or method parameter of a function
6566 type_unification_real (tparms
, targs
, parms
, args
, subr
,
6567 strict
, allow_incomplete
, explicit_mask
)
6568 tree tparms
, targs
, parms
, args
;
6570 unification_kind_t strict
;
6571 int allow_incomplete
;
6576 int ntparms
= TREE_VEC_LENGTH (tparms
);
6579 my_friendly_assert (TREE_CODE (tparms
) == TREE_VEC
, 289);
6580 my_friendly_assert (parms
== NULL_TREE
6581 || TREE_CODE (parms
) == TREE_LIST
, 290);
6582 /* ARGS could be NULL (via a call from parse.y to
6583 build_x_function_call). */
6585 my_friendly_assert (TREE_CODE (args
) == TREE_LIST
, 291);
6586 my_friendly_assert (ntparms
> 0, 292);
6591 sub_strict
= UNIFY_ALLOW_MORE_CV_QUAL
| UNIFY_ALLOW_DERIVED
;
6595 sub_strict
= UNIFY_ALLOW_LESS_CV_QUAL
;
6599 sub_strict
= UNIFY_ALLOW_NONE
;
6603 my_friendly_abort (0);
6607 && parms
!= void_list_node
6609 && args
!= void_list_node
)
6611 parm
= TREE_VALUE (parms
);
6612 parms
= TREE_CHAIN (parms
);
6613 arg
= TREE_VALUE (args
);
6614 args
= TREE_CHAIN (args
);
6616 if (arg
== error_mark_node
)
6618 if (arg
== unknown_type_node
)
6621 /* Conversions will be performed on a function argument that
6622 corresponds with a function parameter that contains only
6623 non-deducible template parameters and explicitly specified
6624 template parameters. */
6625 if (! uses_template_parms (parm
))
6629 if (TREE_CODE_CLASS (TREE_CODE (arg
)) != 't')
6630 type
= TREE_TYPE (arg
);
6637 if (strict
== DEDUCE_EXACT
)
6639 if (comptypes (parm
, type
, 1))
6643 /* It might work; we shouldn't check now, because we might
6644 get into infinite recursion. Overload resolution will
6652 if (TREE_CODE (arg
) == VAR_DECL
)
6653 arg
= TREE_TYPE (arg
);
6654 else if (TREE_CODE_CLASS (TREE_CODE (arg
)) == 'e')
6655 arg
= TREE_TYPE (arg
);
6657 if (TREE_CODE_CLASS (TREE_CODE (arg
)) != 't')
6659 my_friendly_assert (TREE_TYPE (arg
) != NULL_TREE
, 293);
6660 if (TREE_CODE (arg
) == OVERLOAD
6661 && TREE_CODE (OVL_FUNCTION (arg
)) == TEMPLATE_DECL
)
6666 /* Have to back unify here */
6667 arg
= OVL_FUNCTION (arg
);
6668 targs
= make_scratch_vec (DECL_NTPARMS (arg
));
6669 arg_type
= TREE_TYPE (arg
);
6670 maybe_adjust_types_for_deduction (strict
, &parm
, &arg_type
);
6671 parm
= expr_tree_cons (NULL_TREE
, parm
, NULL_TREE
);
6672 arg_type
= scratch_tree_cons (NULL_TREE
, arg_type
, NULL_TREE
);
6674 type_unification (DECL_INNERMOST_TEMPLATE_PARMS (arg
),
6675 targs
, arg_type
, parm
, NULL_TREE
,
6676 DEDUCE_EXACT
, allow_incomplete
);
6678 arg
= TREE_TYPE (arg
);
6682 maybe_adjust_types_for_deduction (strict
, &parm
, &arg
);
6684 switch (unify (tparms
, targs
, parm
, arg
, sub_strict
,
6693 /* Fail if we've reached the end of the parm list, and more args
6694 are present, and the parm list isn't variadic. */
6695 if (args
&& args
!= void_list_node
&& parms
== void_list_node
)
6697 /* Fail if parms are left and they don't have default values. */
6699 && parms
!= void_list_node
6700 && TREE_PURPOSE (parms
) == NULL_TREE
)
6703 for (i
= 0; i
< ntparms
; i
++)
6704 if (TREE_VEC_ELT (targs
, i
) == NULL_TREE
)
6706 if (!allow_incomplete
)
6707 error ("incomplete type unification");
6713 /* Returns the level of DECL, which declares a template parameter. */
6716 template_decl_level (decl
)
6719 switch (TREE_CODE (decl
))
6723 return TEMPLATE_TYPE_LEVEL (TREE_TYPE (decl
));
6726 return TEMPLATE_PARM_LEVEL (DECL_INITIAL (decl
));
6729 my_friendly_abort (0);
6734 /* Decide whether ARG can be unified with PARM, considering only the
6735 cv-qualifiers of each type, given STRICT as documented for unify.
6736 Returns non-zero iff the unification is OK on that basis.*/
6739 check_cv_quals_for_unify (strict
, arg
, parm
)
6744 return !((!(strict
& UNIFY_ALLOW_MORE_CV_QUAL
)
6745 && (TYPE_READONLY (arg
) < TYPE_READONLY (parm
)
6746 || TYPE_VOLATILE (arg
) < TYPE_VOLATILE (parm
)))
6747 || (!(strict
& UNIFY_ALLOW_LESS_CV_QUAL
)
6748 && (TYPE_READONLY (arg
) > TYPE_READONLY (parm
)
6749 || TYPE_VOLATILE (arg
) > TYPE_VOLATILE (parm
))));
6752 /* Takes parameters as for type_unification. Returns 0 if the
6753 type deduction suceeds, 1 otherwise. The parameter STRICT is a
6754 bitwise or of the following flags:
6757 Require an exact match between PARM and ARG.
6758 UNIFY_ALLOW_MORE_CV_QUAL:
6759 Allow the deduced ARG to be more cv-qualified than ARG.
6760 UNIFY_ALLOW_LESS_CV_QUAL:
6761 Allow the deduced ARG to be less cv-qualified than ARG.
6762 UNIFY_ALLOW_DERIVED:
6763 Allow the deduced ARG to be a template base class of ARG,
6764 or a pointer to a template base class of the type pointed to by
6768 unify (tparms
, targs
, parm
, arg
, strict
, explicit_mask
)
6769 tree tparms
, targs
, parm
, arg
;
6777 /* I don't think this will do the right thing with respect to types.
6778 But the only case I've seen it in so far has been array bounds, where
6779 signedness is the only information lost, and I think that will be
6781 while (TREE_CODE (parm
) == NOP_EXPR
)
6782 parm
= TREE_OPERAND (parm
, 0);
6784 if (arg
== error_mark_node
)
6786 if (arg
== unknown_type_node
)
6788 /* If PARM uses template parameters, then we can't bail out here,
6789 even in ARG == PARM, since we won't record unifications for the
6790 template parameters. We might need them if we're trying to
6791 figure out which of two things is more specialized. */
6792 if (arg
== parm
&& !uses_template_parms (parm
))
6795 /* Immediately reject some pairs that won't unify because of
6796 cv-qualification mismatches. */
6797 if (TREE_CODE (arg
) == TREE_CODE (parm
)
6798 && TREE_CODE_CLASS (TREE_CODE (arg
)) == 't'
6799 /* We check the cv-qualifiers when unifying with template type
6800 parameters below. We want to allow ARG `const T' to unify with
6801 PARM `T' for example, when computing which of two templates
6802 is more specialized, for example. */
6803 && TREE_CODE (arg
) != TEMPLATE_TYPE_PARM
6804 && !check_cv_quals_for_unify (strict
, arg
, parm
))
6807 switch (TREE_CODE (parm
))
6810 /* In a type which contains a nested-name-specifier, template
6811 argument values cannot be deduced for template parameters used
6812 within the nested-name-specifier. */
6815 case TEMPLATE_TYPE_PARM
:
6816 case TEMPLATE_TEMPLATE_PARM
:
6817 tparm
= TREE_VALUE (TREE_VEC_ELT (tparms
, 0));
6819 if (TEMPLATE_TYPE_LEVEL (parm
)
6820 != template_decl_level (tparm
))
6821 /* The PARM is not one we're trying to unify. Just check
6822 to see if it matches ARG. */
6823 return (TREE_CODE (arg
) == TREE_CODE (parm
)
6824 && comptypes (parm
, arg
, 1)) ? 0 : 1;
6825 idx
= TEMPLATE_TYPE_IDX (parm
);
6826 targ
= TREE_VEC_ELT (targs
, idx
);
6827 tparm
= TREE_VALUE (TREE_VEC_ELT (tparms
, idx
));
6829 /* Check for mixed types and values. */
6830 if ((TREE_CODE (parm
) == TEMPLATE_TYPE_PARM
6831 && TREE_CODE (tparm
) != TYPE_DECL
)
6832 || (TREE_CODE (parm
) == TEMPLATE_TEMPLATE_PARM
6833 && TREE_CODE (tparm
) != TEMPLATE_DECL
))
6836 if (!strict
&& targ
!= NULL_TREE
6837 && explicit_mask
&& explicit_mask
[idx
])
6838 /* An explicit template argument. Don't even try to match
6839 here; the overload resolution code will manage check to
6840 see whether the call is legal. */
6843 if (TREE_CODE (parm
) == TEMPLATE_TEMPLATE_PARM
)
6845 if (CLASSTYPE_TEMPLATE_INFO (parm
))
6847 /* We arrive here when PARM does not involve template
6850 /* ARG must be constructed from a template class. */
6851 if (TREE_CODE (arg
) != RECORD_TYPE
|| !CLASSTYPE_TEMPLATE_INFO (arg
))
6855 tree parmtmpl
= CLASSTYPE_TI_TEMPLATE (parm
);
6856 tree parmvec
= CLASSTYPE_TI_ARGS (parm
);
6857 tree argvec
= CLASSTYPE_TI_ARGS (arg
);
6859 = DECL_INNERMOST_TEMPLATE_PARMS (CLASSTYPE_TI_TEMPLATE (arg
));
6862 /* The parameter and argument roles have to be switched here
6863 in order to handle default arguments properly. For example,
6864 template<template <class> class TT> void f(TT<int>)
6865 should be able to accept vector<int> which comes from
6866 template <class T, class Allocator = allocator>
6869 if (coerce_template_parms (argtmplvec
, parmvec
, parmtmpl
, 1, 1)
6873 /* Deduce arguments T, i from TT<T> or TT<i>. */
6874 for (i
= 0; i
< TREE_VEC_LENGTH (parmvec
); ++i
)
6876 tree t
= TREE_VEC_ELT (parmvec
, i
);
6877 if (TREE_CODE (t
) != TEMPLATE_TYPE_PARM
6878 && TREE_CODE (t
) != TEMPLATE_TEMPLATE_PARM
6879 && TREE_CODE (t
) != TEMPLATE_PARM_INDEX
)
6882 /* This argument can be deduced. */
6884 if (unify (tparms
, targs
, t
,
6885 TREE_VEC_ELT (argvec
, i
),
6886 UNIFY_ALLOW_NONE
, explicit_mask
))
6890 arg
= CLASSTYPE_TI_TEMPLATE (arg
);
6895 /* If PARM is `const T' and ARG is only `int', we don't have
6896 a match unless we are allowing additional qualification.
6897 If ARG is `const int' and PARM is just `T' that's OK;
6898 that binds `const int' to `T'. */
6899 if (!check_cv_quals_for_unify (strict
| UNIFY_ALLOW_LESS_CV_QUAL
,
6903 /* Consider the case where ARG is `const volatile int' and
6904 PARM is `const T'. Then, T should be `volatile int'. */
6906 cp_build_type_variant (arg
,
6907 TYPE_READONLY (arg
) > TYPE_READONLY (parm
),
6908 TYPE_VOLATILE (arg
) > TYPE_VOLATILE (parm
));
6911 /* Simple cases: Value already set, does match or doesn't. */
6912 if (targ
!= NULL_TREE
6913 && (comptypes (targ
, arg
, 1)
6914 || (explicit_mask
&& explicit_mask
[idx
])))
6918 TREE_VEC_ELT (targs
, idx
) = arg
;
6921 case TEMPLATE_PARM_INDEX
:
6922 tparm
= TREE_VALUE (TREE_VEC_ELT (tparms
, 0));
6924 if (TEMPLATE_PARM_LEVEL (parm
)
6925 != template_decl_level (tparm
))
6926 /* The PARM is not one we're trying to unify. Just check
6927 to see if it matches ARG. */
6928 return (TREE_CODE (arg
) == TREE_CODE (parm
)
6929 && cp_tree_equal (parm
, arg
) > 0) ? 0 : 1;
6931 idx
= TEMPLATE_PARM_IDX (parm
);
6932 targ
= TREE_VEC_ELT (targs
, idx
);
6936 int i
= (cp_tree_equal (targ
, arg
) > 0);
6942 my_friendly_abort (42);
6945 TREE_VEC_ELT (targs
, idx
) = copy_to_permanent (arg
);
6952 if (TREE_CODE (arg
) == RECORD_TYPE
&& TYPE_PTRMEMFUNC_FLAG (arg
))
6953 return (unify (tparms
, targs
, parm
,
6954 TYPE_PTRMEMFUNC_FN_TYPE (arg
), strict
,
6957 if (TREE_CODE (arg
) != POINTER_TYPE
)
6960 /* [temp.deduct.call]
6962 A can be another pointer or pointer to member type that can
6963 be converted to the deduced A via a qualification
6964 conversion (_conv.qual_).
6966 We pass down STRICT here rather than UNIFY_ALLOW_NONE.
6967 This will allow for additional cv-qualification of the
6968 pointed-to types if appropriate. In general, this is a bit
6969 too generous; we are only supposed to allow qualification
6970 conversions and this method will allow an ARG of char** and
6971 a deduced ARG of const char**. However, overload
6972 resolution will subsequently invalidate the candidate, so
6973 this is probably OK. */
6974 sub_strict
= strict
;
6976 if (TREE_CODE (TREE_TYPE (arg
)) != RECORD_TYPE
6977 || TYPE_PTRMEMFUNC_FLAG (TREE_TYPE (arg
)))
6978 /* The derived-to-base conversion only persists through one
6979 level of pointers. */
6980 sub_strict
&= ~UNIFY_ALLOW_DERIVED
;
6982 return unify (tparms
, targs
, TREE_TYPE (parm
), TREE_TYPE
6983 (arg
), sub_strict
, explicit_mask
);
6986 case REFERENCE_TYPE
:
6987 if (TREE_CODE (arg
) != REFERENCE_TYPE
)
6989 return unify (tparms
, targs
, TREE_TYPE (parm
), TREE_TYPE (arg
),
6990 UNIFY_ALLOW_NONE
, explicit_mask
);
6993 if (TREE_CODE (arg
) != ARRAY_TYPE
)
6995 if ((TYPE_DOMAIN (parm
) == NULL_TREE
)
6996 != (TYPE_DOMAIN (arg
) == NULL_TREE
))
6998 if (TYPE_DOMAIN (parm
) != NULL_TREE
6999 && unify (tparms
, targs
, TYPE_DOMAIN (parm
),
7000 TYPE_DOMAIN (arg
), UNIFY_ALLOW_NONE
, explicit_mask
) != 0)
7002 return unify (tparms
, targs
, TREE_TYPE (parm
), TREE_TYPE (arg
),
7003 UNIFY_ALLOW_NONE
, explicit_mask
);
7010 if (TREE_CODE (arg
) != TREE_CODE (parm
))
7013 if (TREE_CODE (parm
) == INTEGER_TYPE
)
7015 if (TYPE_MIN_VALUE (parm
) && TYPE_MIN_VALUE (arg
)
7016 && unify (tparms
, targs
, TYPE_MIN_VALUE (parm
),
7017 TYPE_MIN_VALUE (arg
), UNIFY_ALLOW_NONE
, explicit_mask
))
7019 if (TYPE_MAX_VALUE (parm
) && TYPE_MAX_VALUE (arg
)
7020 && unify (tparms
, targs
, TYPE_MAX_VALUE (parm
),
7021 TYPE_MAX_VALUE (arg
), UNIFY_ALLOW_NONE
, explicit_mask
))
7024 else if (TREE_CODE (parm
) == REAL_TYPE
7025 /* We use the TYPE_MAIN_VARIANT since we have already
7026 checked cv-qualification at the top of the
7028 && !comptypes (TYPE_MAIN_VARIANT (arg
),
7029 TYPE_MAIN_VARIANT (parm
), 1))
7032 /* As far as unification is concerned, this wins. Later checks
7033 will invalidate it if necessary. */
7036 /* Types INTEGER_CST and MINUS_EXPR can come from array bounds. */
7037 /* Type INTEGER_CST can come from ordinary constant template args. */
7039 while (TREE_CODE (arg
) == NOP_EXPR
)
7040 arg
= TREE_OPERAND (arg
, 0);
7042 if (TREE_CODE (arg
) != INTEGER_CST
)
7044 return !tree_int_cst_equal (parm
, arg
);
7049 if (TREE_CODE (arg
) != TREE_VEC
)
7051 if (TREE_VEC_LENGTH (parm
) != TREE_VEC_LENGTH (arg
))
7053 for (i
= TREE_VEC_LENGTH (parm
) - 1; i
>= 0; i
--)
7054 if (unify (tparms
, targs
,
7055 TREE_VEC_ELT (parm
, i
), TREE_VEC_ELT (arg
, i
),
7056 UNIFY_ALLOW_NONE
, explicit_mask
))
7062 if (TYPE_PTRMEMFUNC_FLAG (parm
))
7063 return unify (tparms
, targs
, TYPE_PTRMEMFUNC_FN_TYPE (parm
),
7064 arg
, strict
, explicit_mask
);
7066 if (TREE_CODE (arg
) != RECORD_TYPE
)
7069 if (CLASSTYPE_TEMPLATE_INFO (parm
) && uses_template_parms (parm
))
7072 if (strict
& UNIFY_ALLOW_DERIVED
)
7073 /* [temp.deduct.call]
7075 If P is a class, and P has the form template-id, then A
7076 can be a derived class of the deduced A. Likewise, if
7077 P is a pointer to a class of the form template-id, A
7078 can be a pointer to a derived class pointed to by the
7080 t
= get_template_base (CLASSTYPE_TI_TEMPLATE (parm
), arg
);
7082 (CLASSTYPE_TEMPLATE_INFO (arg
)
7083 && CLASSTYPE_TI_TEMPLATE (parm
) == CLASSTYPE_TI_TEMPLATE (arg
))
7085 if (! t
|| t
== error_mark_node
)
7088 return unify (tparms
, targs
, CLASSTYPE_TI_ARGS (parm
),
7089 CLASSTYPE_TI_ARGS (t
), UNIFY_ALLOW_NONE
,
7092 else if (!comptypes (TYPE_MAIN_VARIANT (parm
),
7093 TYPE_MAIN_VARIANT (arg
), 1))
7099 if (TREE_CODE (arg
) != TREE_CODE (parm
))
7102 if (unify (tparms
, targs
, TREE_TYPE (parm
),
7103 TREE_TYPE (arg
), UNIFY_ALLOW_NONE
, explicit_mask
))
7105 return type_unification_real (tparms
, targs
, TYPE_ARG_TYPES (parm
),
7106 TYPE_ARG_TYPES (arg
), 1,
7107 DEDUCE_EXACT
, 0, explicit_mask
);
7110 if (TREE_CODE (arg
) != OFFSET_TYPE
)
7112 if (unify (tparms
, targs
, TYPE_OFFSET_BASETYPE (parm
),
7113 TYPE_OFFSET_BASETYPE (arg
), UNIFY_ALLOW_NONE
, explicit_mask
))
7115 return unify (tparms
, targs
, TREE_TYPE (parm
), TREE_TYPE (arg
),
7116 UNIFY_ALLOW_NONE
, explicit_mask
);
7119 if (arg
!= decl_constant_value (parm
))
7124 /* Matched cases are handled by the ARG == PARM test above. */
7128 if (TREE_CODE (TREE_OPERAND (parm
, 1)) == INTEGER_CST
)
7130 /* We handle this case specially, since it comes up with
7131 arrays. In particular, something like:
7133 template <int N> void f(int (&x)[N]);
7135 Here, we are trying to unify the range type, which
7136 looks like [0 ... (N - 1)]. */
7138 t1
= TREE_OPERAND (parm
, 0);
7139 t2
= TREE_OPERAND (parm
, 1);
7141 /* Should this be a regular fold? */
7142 t
= maybe_fold_nontype_arg (build (PLUS_EXPR
,
7146 return unify (tparms
, targs
, t1
, t
, UNIFY_ALLOW_NONE
,
7149 /* else fall through */
7152 if (IS_EXPR_CODE_CLASS (TREE_CODE_CLASS (TREE_CODE (parm
))))
7154 /* We're looking at an expression. This can happen with
7158 void foo(S<I>, S<I + 2>);
7160 If the call looked like:
7162 foo(S<2>(), S<4>());
7164 we would have already matched `I' with `2'. Now, we'd
7165 like to know if `4' matches `I + 2'. So, we substitute
7166 into that expression, and fold constants, in the hope of
7169 maybe_fold_nontype_arg (tsubst_expr (parm
, targs
, NULL_TREE
));
7170 tree a
= maybe_fold_nontype_arg (arg
);
7172 if (!IS_EXPR_CODE_CLASS (TREE_CODE_CLASS (TREE_CODE (t
))))
7173 /* Good, we mangaged to simplify the exression. */
7174 return unify (tparms
, targs
, t
, a
, UNIFY_ALLOW_NONE
,
7177 /* Bad, we couldn't simplify this. Assume it doesn't
7182 sorry ("use of `%s' in template type unification",
7183 tree_code_name
[(int) TREE_CODE (parm
)]);
7189 /* Called if RESULT is explicitly instantiated, or is a member of an
7190 explicitly instantiated class, or if using -frepo and the
7191 instantiation of RESULT has been assigned to this file. */
7194 mark_decl_instantiated (result
, extern_p
)
7198 if (TREE_CODE (result
) != FUNCTION_DECL
)
7199 /* The TREE_PUBLIC flag for function declarations will have been
7200 set correctly by tsubst. */
7201 TREE_PUBLIC (result
) = 1;
7205 DECL_INTERFACE_KNOWN (result
) = 1;
7206 DECL_NOT_REALLY_EXTERN (result
) = 1;
7208 /* For WIN32 we also want to put explicit instantiations in
7209 linkonce sections. */
7210 if (TREE_PUBLIC (result
))
7211 maybe_make_one_only (result
);
7213 else if (TREE_CODE (result
) == FUNCTION_DECL
)
7214 mark_inline_for_output (result
);
7217 /* Given two function templates PAT1 and PAT2, and explicit template
7218 arguments EXPLICIT_ARGS return:
7220 1 if PAT1 is more specialized than PAT2 as described in [temp.func.order].
7221 -1 if PAT2 is more specialized than PAT1.
7222 0 if neither is more specialized. */
7225 more_specialized (pat1
, pat2
, explicit_args
)
7226 tree pat1
, pat2
, explicit_args
;
7231 targs
= get_bindings_overload (pat1
, pat2
, explicit_args
);
7235 targs
= get_bindings_overload (pat2
, pat1
, explicit_args
);
7242 /* Given two class template specialization list nodes PAT1 and PAT2, return:
7244 1 if PAT1 is more specialized than PAT2 as described in [temp.class.order].
7245 -1 if PAT2 is more specialized than PAT1.
7246 0 if neither is more specialized. */
7249 more_specialized_class (pat1
, pat2
)
7255 targs
= get_class_bindings (TREE_VALUE (pat1
), TREE_PURPOSE (pat1
),
7256 TREE_PURPOSE (pat2
));
7260 targs
= get_class_bindings (TREE_VALUE (pat2
), TREE_PURPOSE (pat2
),
7261 TREE_PURPOSE (pat1
));
7268 /* Return the template arguments that will produce the function signature
7269 DECL from the function template FN, with the explicit template
7270 arguments EXPLICIT_ARGS. If CHECK_RETTYPE is 1, the return type must
7274 get_bindings_real (fn
, decl
, explicit_args
, check_rettype
)
7275 tree fn
, decl
, explicit_args
;
7278 int ntparms
= DECL_NTPARMS (fn
);
7279 tree targs
= make_scratch_vec (ntparms
);
7280 tree decl_arg_types
= TYPE_ARG_TYPES (TREE_TYPE (decl
));
7281 tree extra_fn_arg
= NULL_TREE
;
7284 if (DECL_STATIC_FUNCTION_P (fn
)
7285 && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl
))
7287 /* Sometimes we are trying to figure out what's being
7288 specialized by a declaration that looks like a method, and it
7289 turns out to be a static member function. */
7290 if (CLASSTYPE_TEMPLATE_INFO (DECL_REAL_CONTEXT (fn
))
7291 && !is_member_template (fn
))
7292 /* The natural thing to do here seems to be to remove the
7293 spurious `this' parameter from the DECL, but that prevents
7294 unification from making use of the class type. So,
7295 instead, we have fn_type_unification add to the parameters
7297 extra_fn_arg
= build_pointer_type (DECL_REAL_CONTEXT (fn
));
7299 /* In this case, though, adding the extra_fn_arg can confuse
7300 things, so we remove from decl_arg_types instead. */
7301 decl_arg_types
= TREE_CHAIN (decl_arg_types
);
7304 i
= fn_type_unification (fn
, explicit_args
, targs
,
7306 TREE_TYPE (TREE_TYPE (decl
)),
7315 /* Check to see that the resulting return type is also OK. */
7316 tree t
= tsubst (TREE_TYPE (TREE_TYPE (fn
)), targs
,
7319 if (!comptypes (t
, TREE_TYPE (TREE_TYPE (decl
)), 1))
7326 /* For most uses, we want to check the return type. */
7329 get_bindings (fn
, decl
, explicit_args
)
7330 tree fn
, decl
, explicit_args
;
7332 return get_bindings_real (fn
, decl
, explicit_args
, 1);
7335 /* But for more_specialized, we only care about the parameter types. */
7338 get_bindings_overload (fn
, decl
, explicit_args
)
7339 tree fn
, decl
, explicit_args
;
7341 return get_bindings_real (fn
, decl
, explicit_args
, 0);
7344 /* Return the innermost template arguments that, when applied to a
7345 template specialization whose innermost template parameters are
7346 TPARMS, and whose specialization arguments are ARGS, yield the
7349 For example, suppose we have:
7351 template <class T, class U> struct S {};
7352 template <class T> struct S<T*, int> {};
7354 Then, suppose we want to get `S<double*, int>'. The TPARMS will be
7355 {T}, the PARMS will be {T*, int} and the ARGS will be {double*,
7356 int}. The resulting vector will be {double}, indicating that `T'
7357 is bound to `double'. */
7360 get_class_bindings (tparms
, parms
, args
)
7361 tree tparms
, parms
, args
;
7363 int i
, ntparms
= TREE_VEC_LENGTH (tparms
);
7364 tree vec
= make_temp_vec (ntparms
);
7366 args
= innermost_args (args
);
7368 for (i
= 0; i
< TREE_VEC_LENGTH (parms
); ++i
)
7370 switch (unify (tparms
, vec
,
7371 TREE_VEC_ELT (parms
, i
), TREE_VEC_ELT (args
, i
),
7372 UNIFY_ALLOW_NONE
, 0))
7381 for (i
= 0; i
< ntparms
; ++i
)
7382 if (! TREE_VEC_ELT (vec
, i
))
7388 /* Return the most specialized of the list of templates in FNS that can
7389 produce an instantiation matching DECL, given the explicit template
7390 arguments EXPLICIT_ARGS. */
7393 most_specialized (fns
, decl
, explicit_args
)
7394 tree fns
, decl
, explicit_args
;
7396 tree candidates
= NULL_TREE
;
7397 tree fn
, champ
, args
;
7400 for (fn
= fns
; fn
; fn
= TREE_CHAIN (fn
))
7402 tree candidate
= TREE_VALUE (fn
);
7404 args
= get_bindings (candidate
, decl
, explicit_args
);
7406 candidates
= scratch_tree_cons (NULL_TREE
, candidate
,
7413 champ
= TREE_VALUE (candidates
);
7414 for (fn
= TREE_CHAIN (candidates
); fn
; fn
= TREE_CHAIN (fn
))
7416 fate
= more_specialized (champ
, TREE_VALUE (fn
), explicit_args
);
7423 fn
= TREE_CHAIN (fn
);
7425 return error_mark_node
;
7427 champ
= TREE_VALUE (fn
);
7431 for (fn
= candidates
; fn
&& TREE_VALUE (fn
) != champ
; fn
= TREE_CHAIN (fn
))
7433 fate
= more_specialized (champ
, TREE_VALUE (fn
), explicit_args
);
7435 return error_mark_node
;
7441 /* If DECL is a specialization of some template, return the most
7442 general such template. For example, given:
7444 template <class T> struct S { template <class U> void f(U); };
7446 if TMPL is `template <class U> void S<int>::f(U)' this will return
7447 the full template. This function will not trace past partial
7448 specializations, however. For example, given in addition:
7450 template <class T> struct S<T*> { template <class U> void f(U); };
7452 if TMPL is `template <class U> void S<int*>::f(U)' this will return
7453 `template <class T> template <class U> S<T*>::f(U)'. */
7456 most_general_template (decl
)
7459 while (DECL_TEMPLATE_INFO (decl
))
7460 decl
= DECL_TI_TEMPLATE (decl
);
7465 /* Return the most specialized of the class template specializations
7466 of TMPL which can produce an instantiation matching ARGS, or
7467 error_mark_node if the choice is ambiguous. */
7470 most_specialized_class (tmpl
, args
)
7474 tree list
= NULL_TREE
;
7479 tmpl
= most_general_template (tmpl
);
7480 for (t
= DECL_TEMPLATE_SPECIALIZATIONS (tmpl
); t
; t
= TREE_CHAIN (t
))
7483 = get_class_bindings (TREE_VALUE (t
), TREE_PURPOSE (t
), args
);
7486 list
= decl_tree_cons (TREE_PURPOSE (t
), TREE_VALUE (t
), list
);
7487 TREE_TYPE (list
) = TREE_TYPE (t
);
7497 for (; t
; t
= TREE_CHAIN (t
))
7499 fate
= more_specialized_class (champ
, t
);
7508 return error_mark_node
;
7514 for (t
= list
; t
&& t
!= champ
; t
= TREE_CHAIN (t
))
7516 fate
= more_specialized_class (champ
, t
);
7518 return error_mark_node
;
7524 /* called from the parser. */
7527 do_decl_instantiation (declspecs
, declarator
, storage
)
7528 tree declspecs
, declarator
, storage
;
7530 tree decl
= grokdeclarator (declarator
, declspecs
, NORMAL
, 0, NULL_TREE
);
7531 tree result
= NULL_TREE
;
7534 if (! DECL_LANG_SPECIFIC (decl
))
7536 cp_error ("explicit instantiation of non-template `%#D'", decl
);
7539 else if (TREE_CODE (decl
) == VAR_DECL
)
7541 /* There is an asymmetry here in the way VAR_DECLs and
7542 FUNCTION_DECLs are handled by grokdeclarator. In the case of
7543 the latter, the DECL we get back will be marked as a
7544 template instantiation, and the appropriate
7545 DECL_TEMPLATE_INFO will be set up. This does not happen for
7546 VAR_DECLs so we do the lookup here. Probably, grokdeclarator
7547 should handle VAR_DECLs as it currently handles
7549 result
= lookup_field (DECL_CONTEXT (decl
), DECL_NAME (decl
), 0, 0);
7550 if (result
&& TREE_CODE (result
) != VAR_DECL
)
7552 cp_error ("no matching template for `%D' found", result
);
7556 else if (TREE_CODE (decl
) != FUNCTION_DECL
)
7558 cp_error ("explicit instantiation of `%#D'", decl
);
7564 /* Check for various error cases. Note that if the explicit
7565 instantiation is legal the RESULT will currently be marked as an
7566 *implicit* instantiation; DECL_EXPLICIT_INSTANTIATION is not set
7567 until we get here. */
7569 if (DECL_TEMPLATE_SPECIALIZATION (result
))
7573 No program shall both explicitly instantiate and explicitly
7574 specialize a template. */
7575 cp_error ("explicit instantiation of `%#D' after", result
);
7576 cp_error_at ("explicit specialization here", result
);
7579 else if (DECL_EXPLICIT_INSTANTIATION (result
))
7583 No program shall explicitly instantiate any template more
7586 We check DECL_INTERFACE_KNOWN so as not to complain when the
7587 first instantiation was `extern' and the second is not, and
7588 EXTERN_P for the opposite case. */
7589 if (DECL_INTERFACE_KNOWN (result
) && !extern_p
)
7590 cp_error ("duplicate explicit instantiation of `%#D'", result
);
7592 /* If we've already instantiated the template, just return now. */
7593 if (DECL_INTERFACE_KNOWN (result
))
7596 else if (!DECL_IMPLICIT_INSTANTIATION (result
))
7598 cp_error ("no matching template for `%D' found", result
);
7601 else if (!DECL_TEMPLATE_INFO (result
))
7603 cp_pedwarn ("explicit instantiation of non-template `%#D'", result
);
7607 if (flag_external_templates
)
7610 if (storage
== NULL_TREE
)
7612 else if (storage
== ridpointers
[(int) RID_EXTERN
])
7615 cp_pedwarn ("ANSI C++ forbids the use of `extern' on explicit instantiations");
7619 cp_error ("storage class `%D' applied to template instantiation",
7622 SET_DECL_EXPLICIT_INSTANTIATION (result
);
7623 mark_decl_instantiated (result
, extern_p
);
7624 repo_template_instantiated (result
, extern_p
);
7626 instantiate_decl (result
);
7630 mark_class_instantiated (t
, extern_p
)
7634 SET_CLASSTYPE_EXPLICIT_INSTANTIATION (t
);
7635 SET_CLASSTYPE_INTERFACE_KNOWN (t
);
7636 CLASSTYPE_INTERFACE_ONLY (t
) = extern_p
;
7637 CLASSTYPE_VTABLE_NEEDS_WRITING (t
) = ! extern_p
;
7638 TYPE_DECL_SUPPRESS_DEBUG (TYPE_NAME (t
)) = extern_p
;
7641 CLASSTYPE_DEBUG_REQUESTED (t
) = 1;
7642 rest_of_type_compilation (t
, 1);
7647 do_type_instantiation (t
, storage
)
7654 if (TREE_CODE (t
) == TYPE_DECL
)
7657 if (! IS_AGGR_TYPE (t
) || ! CLASSTYPE_TEMPLATE_INFO (t
))
7659 cp_error ("explicit instantiation of non-template type `%T'", t
);
7665 /* With -fexternal-templates, explicit instantiations are treated the same
7666 as implicit ones. */
7667 if (flag_external_templates
)
7670 if (TYPE_SIZE (t
) == NULL_TREE
)
7672 cp_error ("explicit instantiation of `%#T' before definition of template",
7677 if (storage
!= NULL_TREE
)
7680 cp_pedwarn("ANSI C++ forbids the use of `%s' on explicit instantiations",
7681 IDENTIFIER_POINTER (storage
));
7683 if (storage
== ridpointers
[(int) RID_INLINE
])
7685 else if (storage
== ridpointers
[(int) RID_EXTERN
])
7687 else if (storage
== ridpointers
[(int) RID_STATIC
])
7691 cp_error ("storage class `%D' applied to template instantiation",
7697 if (CLASSTYPE_TEMPLATE_SPECIALIZATION (t
))
7701 No program shall both explicitly instantiate and explicitly
7702 specialize a template. */
7703 cp_error ("explicit instantiation of `%#T' after", t
);
7704 cp_error_at ("explicit specialization here", t
);
7707 else if (CLASSTYPE_EXPLICIT_INSTANTIATION (t
))
7711 No program shall explicitly instantiate any template more
7714 If CLASSTYPE_INTERFACE_ONLY, then the first explicit
7715 instantiation was `extern', and if EXTERN_P then the second
7716 is. Both cases are OK. */
7717 if (!CLASSTYPE_INTERFACE_ONLY (t
) && !extern_p
)
7718 cp_error ("duplicate explicit instantiation of `%#T'", t
);
7720 /* If we've already instantiated the template, just return now. */
7721 if (!CLASSTYPE_INTERFACE_ONLY (t
))
7725 mark_class_instantiated (t
, extern_p
);
7726 repo_template_instantiated (t
, extern_p
);
7734 /* In contrast to implicit instantiation, where only the
7735 declarations, and not the definitions, of members are
7736 instantiated, we have here:
7740 The explicit instantiation of a class template specialization
7741 implies the instantiation of all of its members not
7742 previously explicitly specialized in the translation unit
7743 containing the explicit instantiation.
7745 Of course, we can't instantiate member template classes, since
7746 we don't have any arguments for them. Note that the standard
7747 is unclear on whether the instatiation of the members are
7748 *explicit* instantiations or not. We choose to be generous,
7749 and not set DECL_EXPLICIT_INSTANTIATION. Therefore, we allow
7750 the explicit instantiation of a class where some of the members
7751 have no definition in the current translation unit. */
7754 for (tmp
= TYPE_METHODS (t
); tmp
; tmp
= TREE_CHAIN (tmp
))
7755 if (TREE_CODE (tmp
) == FUNCTION_DECL
7756 && DECL_TEMPLATE_INSTANTIATION (tmp
))
7758 mark_decl_instantiated (tmp
, extern_p
);
7759 repo_template_instantiated (tmp
, extern_p
);
7761 instantiate_decl (tmp
);
7764 for (tmp
= TYPE_FIELDS (t
); tmp
; tmp
= TREE_CHAIN (tmp
))
7765 if (TREE_CODE (tmp
) == VAR_DECL
&& DECL_TEMPLATE_INSTANTIATION (tmp
))
7767 mark_decl_instantiated (tmp
, extern_p
);
7768 repo_template_instantiated (tmp
, extern_p
);
7770 instantiate_decl (tmp
);
7773 for (tmp
= CLASSTYPE_TAGS (t
); tmp
; tmp
= TREE_CHAIN (tmp
))
7774 if (IS_AGGR_TYPE (TREE_VALUE (tmp
))
7775 && !uses_template_parms (CLASSTYPE_TI_ARGS (TREE_VALUE (tmp
))))
7776 do_type_instantiation (TYPE_MAIN_DECL (TREE_VALUE (tmp
)), storage
);
7780 /* Given a function DECL, which is a specialization of TMPL, modify
7781 DECL to be a re-instantiation of TMPL with the same template
7782 arguments. TMPL should be the template into which tsubst'ing
7783 should occur for DECL, not the most general template.
7785 One reason for doing this is a scenario like this:
7788 void f(const T&, int i);
7790 void g() { f(3, 7); }
7793 void f(const T& t, const int i) { }
7795 Note that when the template is first instantiated, with
7796 instantiate_template, the resulting DECL will have no name for the
7797 first parameter, and the wrong type for the second. So, when we go
7798 to instantiate the DECL, we regenerate it. */
7801 regenerate_decl_from_template (decl
, tmpl
)
7811 args
= DECL_TI_ARGS (decl
);
7812 code_pattern
= DECL_TEMPLATE_RESULT (tmpl
);
7814 /* Unregister the specialization so that when we tsubst we will not
7815 just return DECL. We don't have to unregister DECL from TMPL
7816 because if would only be registered there if it were a partial
7817 instantiation of a specialization, which it isn't: it's a full
7819 gen_tmpl
= most_general_template (tmpl
);
7820 unregistered
= unregister_specialization (decl
, gen_tmpl
);
7822 /* If the DECL was not unregistered then something peculiar is
7823 happening: we created a specialization but did not call
7824 register_specialization for it. */
7825 my_friendly_assert (unregistered
, 0);
7827 /* Do the substitution to get the new declaration. */
7828 new_decl
= tsubst (code_pattern
, args
, NULL_TREE
);
7830 if (TREE_CODE (decl
) == VAR_DECL
)
7832 /* Set up DECL_INITIAL, since tsubst doesn't. */
7833 pushclass (DECL_CONTEXT (decl
), 2);
7834 DECL_INITIAL (new_decl
) =
7835 tsubst_expr (DECL_INITIAL (code_pattern
), args
,
7836 DECL_TI_TEMPLATE (decl
));
7840 if (TREE_CODE (decl
) == FUNCTION_DECL
)
7841 /* Convince duplicate_decls to use the DECL_ARGUMENTS from the
7843 DECL_INITIAL (new_decl
) = error_mark_node
;
7845 /* The immediate parent of the new template is still whatever it was
7846 before, even though tsubst sets DECL_TI_TEMPLATE up as the most
7847 general template. We also reset the DECL_ASSEMBLER_NAME since
7848 tsubst always calculates the name as if the function in question
7849 were really a template instance, and sometimes, with friend
7850 functions, this is not so. See tsubst_friend_function for
7852 DECL_TI_TEMPLATE (new_decl
) = DECL_TI_TEMPLATE (decl
);
7853 DECL_ASSEMBLER_NAME (new_decl
) = DECL_ASSEMBLER_NAME (decl
);
7854 DECL_RTL (new_decl
) = DECL_RTL (decl
);
7856 /* Call duplicate decls to merge the old and new declarations. */
7857 duplicate_decls (new_decl
, decl
);
7859 if (TREE_CODE (decl
) == FUNCTION_DECL
)
7860 DECL_INITIAL (new_decl
) = NULL_TREE
;
7862 /* Now, re-register the specialization. */
7863 register_specialization (decl
, gen_tmpl
, args
);
7866 /* Produce the definition of D, a _DECL generated from a template. */
7869 instantiate_decl (d
)
7872 tree tmpl
= DECL_TI_TEMPLATE (d
);
7873 tree args
= DECL_TI_ARGS (d
);
7878 int nested
= in_function_p ();
7879 int pattern_defined
;
7881 char *file
= input_filename
;
7883 /* This function should only be used to instantiate templates for
7884 functions and static member variables. */
7885 my_friendly_assert (TREE_CODE (d
) == FUNCTION_DECL
7886 || TREE_CODE (d
) == VAR_DECL
, 0);
7888 if ((TREE_CODE (d
) == FUNCTION_DECL
&& DECL_INITIAL (d
))
7889 || (TREE_CODE (d
) == VAR_DECL
&& !DECL_IN_AGGR_P (d
)))
7890 /* D has already been instantiated. It might seem reasonable to
7891 check whether or not D is an explict instantiation, and, if so,
7892 stop here. But when an explicit instantiation is deferred
7893 until the end of the compilation, DECL_EXPLICIT_INSTANTIATION
7894 is set, even though we still need to do the instantiation. */
7897 /* If we already have a specialization of this declaration, then
7898 there's no reason to instantiate it. Note that
7899 retrieve_specialization gives us both instantiations and
7900 specializations, so we must explicitly check
7901 DECL_TEMPLATE_SPECIALIZATION. */
7902 gen_tmpl
= most_general_template (tmpl
);
7903 spec
= retrieve_specialization (gen_tmpl
, args
);
7904 if (spec
!= NULL_TREE
&& DECL_TEMPLATE_SPECIALIZATION (spec
))
7907 /* This needs to happen before any tsubsting. */
7908 if (! push_tinst_level (d
))
7911 /* Set TD to the template whose DECL_TEMPLATE_RESULT is the pattern
7912 for the instantiation. This is not always the most general
7913 template. Consider, for example:
7916 struct S { template <class U> void f();
7917 template <> void f<int>(); };
7919 and an instantiation of S<double>::f<int>. We want TD to be the
7920 specialization S<T>::f<int>, not the more general S<T>::f<U>. */
7923 /* An instantiation cannot have a definition, so we need a
7924 more general template. */
7925 DECL_TEMPLATE_INSTANTIATION (td
)
7926 /* We must also deal with friend templates. Given:
7928 template <class T> struct S {
7929 template <class U> friend void f() {};
7932 S<int>::f<U> say, is not an instantiation of S<T>::f<U>,
7933 so far as the language is concerned, but that's still
7934 where we get the pattern for the instantiation from. On
7935 ther hand, if the definition comes outside the class, say:
7937 template <class T> struct S {
7938 template <class U> friend void f();
7940 template <class U> friend void f() {}
7942 we don't need to look any further. That's what the check for
7943 DECL_INITIAL is for. */
7944 || (TREE_CODE (d
) == FUNCTION_DECL
7945 && DECL_TEMPLATE_INFO (td
)
7946 && !DECL_TEMPLATE_SPECIALIZATION (td
)
7947 && !DECL_INITIAL (DECL_TEMPLATE_RESULT (td
)));
7950 /* The present template, TD, should not be a definition. If it
7951 were a definition, we should be using it! Note that we
7952 cannot restructure the loop to just keep going until we find
7953 a template with a definition, since that might go too far if
7954 a specialization was declared, but not defined. */
7955 my_friendly_assert (!(TREE_CODE (d
) == FUNCTION_DECL
7956 && DECL_INITIAL (DECL_TEMPLATE_RESULT (td
))),
7958 my_friendly_assert (!(TREE_CODE (d
) == VAR_DECL
7959 && !DECL_IN_AGGR_P (DECL_TEMPLATE_RESULT (td
))),
7962 /* Fetch the more general template. */
7963 td
= DECL_TI_TEMPLATE (td
);
7966 code_pattern
= DECL_TEMPLATE_RESULT (td
);
7968 if (TREE_CODE (d
) == FUNCTION_DECL
)
7969 pattern_defined
= (DECL_INITIAL (code_pattern
) != NULL_TREE
);
7971 pattern_defined
= ! DECL_IN_AGGR_P (code_pattern
);
7973 push_to_top_level ();
7974 lineno
= DECL_SOURCE_LINE (d
);
7975 input_filename
= DECL_SOURCE_FILE (d
);
7977 if (pattern_defined
)
7979 repo_template_used (d
);
7981 if (flag_external_templates
&& ! DECL_INTERFACE_KNOWN (d
))
7983 if (flag_alt_external_templates
)
7985 if (interface_unknown
)
7986 warn_if_unknown_interface (d
);
7988 else if (DECL_INTERFACE_KNOWN (code_pattern
))
7990 DECL_INTERFACE_KNOWN (d
) = 1;
7991 DECL_NOT_REALLY_EXTERN (d
) = ! DECL_EXTERNAL (code_pattern
);
7994 warn_if_unknown_interface (code_pattern
);
7998 import_export_decl (d
);
8001 /* Reject all external templates except inline functions. */
8002 if (DECL_INTERFACE_KNOWN (d
)
8003 && ! DECL_NOT_REALLY_EXTERN (d
)
8004 && ! (TREE_CODE (d
) == FUNCTION_DECL
&& DECL_INLINE (d
)))
8007 if (TREE_CODE (d
) == VAR_DECL
8008 && TREE_READONLY (d
)
8009 && DECL_INITIAL (d
) == NULL_TREE
8010 && DECL_INITIAL (code_pattern
) != NULL_TREE
)
8011 /* We need to set up DECL_INITIAL regardless of pattern_defined if
8012 the variable is a static const initialized in the class body. */;
8013 else if (! pattern_defined
8014 || (! (TREE_CODE (d
) == FUNCTION_DECL
&& DECL_INLINE (d
) && nested
)
8017 /* Defer all templates except inline functions used in another
8020 input_filename
= file
;
8022 if (at_eof
&& !pattern_defined
8023 && DECL_EXPLICIT_INSTANTIATION (d
))
8026 The definition of a non-exported function template, a
8027 non-exported member function template, or a non-exported
8028 member function or static data member of a class template
8029 shall be present in every translation unit in which it is
8030 explicitly instantiated. */
8031 cp_error ("explicit instantiation of `%D' but no definition available",
8034 add_pending_template (d
);
8038 regenerate_decl_from_template (d
, td
);
8040 /* We already set the file and line above. Reset them now in case
8041 they changed as a result of calling regenerate_decl_from_template. */
8042 lineno
= DECL_SOURCE_LINE (d
);
8043 input_filename
= DECL_SOURCE_FILE (d
);
8045 if (TREE_CODE (d
) == VAR_DECL
)
8047 DECL_IN_AGGR_P (d
) = 0;
8048 if (DECL_INTERFACE_KNOWN (d
))
8049 DECL_EXTERNAL (d
) = ! DECL_NOT_REALLY_EXTERN (d
);
8052 DECL_EXTERNAL (d
) = 1;
8053 DECL_NOT_REALLY_EXTERN (d
) = 1;
8055 cp_finish_decl (d
, DECL_INITIAL (d
), NULL_TREE
, 0, 0);
8057 else if (TREE_CODE (d
) == FUNCTION_DECL
)
8059 tree t
= DECL_SAVED_TREE (code_pattern
);
8061 start_function (NULL_TREE
, d
, NULL_TREE
, 1);
8062 store_parm_decls ();
8064 if (t
&& TREE_CODE (t
) == RETURN_INIT
)
8067 (TREE_OPERAND (t
, 0),
8068 tsubst_expr (TREE_OPERAND (t
, 1), args
, tmpl
));
8072 if (t
&& TREE_CODE (t
) == CTOR_INITIALIZER
)
8074 current_member_init_list
8075 = tsubst_expr_values (TREE_OPERAND (t
, 0), args
);
8076 current_base_init_list
8077 = tsubst_expr_values (TREE_OPERAND (t
, 1), args
);
8082 /* Always keep the BLOCK node associated with the outermost
8083 pair of curly braces of a function. These are needed
8084 for correct operation of dwarfout.c. */
8087 my_friendly_assert (TREE_CODE (t
) == COMPOUND_STMT
, 42);
8088 tsubst_expr (t
, args
, tmpl
);
8090 finish_function (lineno
, 0, nested
);
8095 input_filename
= file
;
8097 pop_from_top_level ();
8104 tsubst_chain (t
, argvec
)
8109 tree first
= tsubst (t
, argvec
, NULL_TREE
);
8112 for (t
= TREE_CHAIN (t
); t
; t
= TREE_CHAIN (t
))
8114 tree x
= tsubst (t
, argvec
, NULL_TREE
);
8115 TREE_CHAIN (last
) = x
;
8125 tsubst_expr_values (t
, argvec
)
8128 tree first
= NULL_TREE
;
8131 for (; t
; t
= TREE_CHAIN (t
))
8133 tree pur
= tsubst_copy (TREE_PURPOSE (t
), argvec
, NULL_TREE
);
8134 tree val
= tsubst_expr (TREE_VALUE (t
), argvec
, NULL_TREE
);
8135 *p
= build_tree_list (pur
, val
);
8136 p
= &TREE_CHAIN (*p
);
8147 last_tree
= TREE_CHAIN (last_tree
) = t
;
8154 saved_trees
= tree_cons (NULL_TREE
, last_tree
, saved_trees
);
8155 last_tree
= NULL_TREE
;
8162 my_friendly_assert (saved_trees
!= NULL_TREE
, 0);
8164 last_tree
= TREE_VALUE (saved_trees
);
8165 saved_trees
= TREE_CHAIN (saved_trees
);
8168 /* D is an undefined function declaration in the presence of templates with
8169 the same name, listed in FNS. If one of them can produce D as an
8170 instantiation, remember this so we can instantiate it at EOF if D has
8171 not been defined by that time. */
8174 add_maybe_template (d
, fns
)
8179 if (DECL_MAYBE_TEMPLATE (d
))
8182 t
= most_specialized (fns
, d
, NULL_TREE
);
8185 if (t
== error_mark_node
)
8187 cp_error ("ambiguous template instantiation for `%D'", d
);
8191 *maybe_template_tail
= perm_tree_cons (t
, d
, NULL_TREE
);
8192 maybe_template_tail
= &TREE_CHAIN (*maybe_template_tail
);
8193 DECL_MAYBE_TEMPLATE (d
) = 1;
8196 /* Instantiate an enumerated type. TAG is the template type, NEWTAG
8197 is the instantiation (which should have been created with
8198 start_enum) and ARGS are the template arguments to use. */
8201 tsubst_enum (tag
, newtag
, args
)
8208 for (e
= TYPE_VALUES (tag
); e
; e
= TREE_CHAIN (e
))
8213 value
= TREE_VALUE (e
);
8216 if (TREE_CODE (value
) == NOP_EXPR
)
8217 /* This is the special case where the value is really a
8218 TEMPLATE_PARM_INDEX. See finish_enum. */
8219 value
= TREE_OPERAND (value
, 0);
8220 value
= tsubst_expr (value
, args
, NULL_TREE
);
8223 elt
= build_enumerator (TREE_PURPOSE (e
), value
);
8225 /* We save the enumerators we have built so far in the
8226 TYPE_VALUES so that if the enumeration constants for
8227 subsequent enumerators involve those for previous ones,
8228 tsubst_copy will be able to find them. */
8229 TREE_CHAIN (elt
) = TYPE_VALUES (newtag
);
8230 TYPE_VALUES (newtag
) = elt
;
8233 finish_enum (newtag
);
8236 /* Set the DECL_ASSEMBLER_NAME for DECL, which is a FUNCTION_DECL that
8237 is either an instantiation or specialization of a template
8241 set_mangled_name_for_template_decl (decl
)
8244 tree saved_namespace
;
8254 my_friendly_assert (TREE_CODE (decl
) == FUNCTION_DECL
, 0);
8255 my_friendly_assert (DECL_TEMPLATE_INFO (decl
) != NULL_TREE
, 0);
8257 /* The names of template functions must be mangled so as to indicate
8258 what template is being specialized with what template arguments.
8259 For example, each of the following three functions must get
8260 different mangled names:
8263 template <> void f<7>(int);
8264 template <> void f<8>(int); */
8266 targs
= DECL_TI_ARGS (decl
);
8267 if (uses_template_parms (targs
))
8268 /* This DECL is for a partial instantiation. There's no need to
8269 mangle the name of such an entity. */
8272 tmpl
= most_general_template (DECL_TI_TEMPLATE (decl
));
8273 tparms
= DECL_TEMPLATE_PARMS (tmpl
);
8274 parm_depth
= TMPL_PARMS_DEPTH (tparms
);
8276 /* There should be as many levels of arguments as there are levels
8278 my_friendly_assert (parm_depth
== TMPL_ARGS_DEPTH (targs
), 0);
8280 /* We now compute the PARMS and RET_TYPE to give to
8281 build_decl_overload_real. The PARMS and RET_TYPE are the
8282 parameter and return types of the template, after all but the
8283 innermost template arguments have been substituted, not the
8284 parameter and return types of the function DECL. For example,
8287 template <class T> T f(T);
8289 both PARMS and RET_TYPE should be `T' even if DECL is `int f(int)'.
8290 A more subtle example is:
8292 template <class T> struct S { template <class U> void f(T, U); }
8294 Here, if DECL is `void S<int>::f(int, double)', PARMS should be
8295 {int, U}. Thus, the args that we want to subsitute into the
8296 return and parameter type for the function are those in TARGS,
8297 with the innermost level omitted. */
8298 fn_type
= TREE_TYPE (tmpl
);
8299 if (DECL_STATIC_FUNCTION_P (decl
))
8300 context
= DECL_CLASS_CONTEXT (decl
);
8302 if (parm_depth
== 1)
8303 /* No substitution is necessary. */
8310 /* Replace the innermost level of the TARGS with NULL_TREEs to
8311 let tsubst know not to subsitute for those parameters. */
8312 partial_args
= make_temp_vec (TREE_VEC_LENGTH (targs
));
8313 for (i
= 1; i
< TMPL_ARGS_DEPTH (targs
); ++i
)
8314 SET_TMPL_ARGS_LEVEL (partial_args
, i
,
8315 TMPL_ARGS_LEVEL (targs
, i
));
8316 SET_TMPL_ARGS_LEVEL (partial_args
,
8317 TMPL_ARGS_DEPTH (targs
),
8318 make_temp_vec (DECL_NTPARMS (tmpl
)));
8320 /* Now, do the (partial) substitution to figure out the
8321 appropriate function type. */
8322 fn_type
= tsubst (fn_type
, partial_args
, NULL_TREE
);
8323 if (DECL_STATIC_FUNCTION_P (decl
))
8324 context
= tsubst (context
, partial_args
, NULL_TREE
);
8326 /* Substitute into the template parameters to obtain the real
8327 innermost set of parameters. This step is important if the
8328 innermost set of template parameters contains value
8329 parameters whose types depend on outer template parameters. */
8330 TREE_VEC_LENGTH (partial_args
)--;
8331 tparms
= tsubst_template_parms (tparms
, partial_args
);
8334 /* Now, get the innermost parameters and arguments, and figure out
8335 the parameter and return types. */
8336 tparms
= INNERMOST_TEMPLATE_PARMS (tparms
);
8337 targs
= innermost_args (targs
);
8338 ret_type
= TREE_TYPE (fn_type
);
8339 parm_types
= TYPE_ARG_TYPES (fn_type
);
8341 /* For a static member function, we generate a fake `this' pointer,
8342 for the purposes of mangling. This indicates of which class the
8343 function is a member. Because of:
8347 There shall not be a static and a nonstatic member function
8348 with the same name and the same parameter types
8350 we don't have to worry that this will result in a clash with a
8351 non-static member function. */
8352 if (DECL_STATIC_FUNCTION_P (decl
))
8353 parm_types
= hash_tree_chain (build_pointer_type (context
), parm_types
);
8355 /* There should be the same number of template parameters as
8356 template arguments. */
8357 my_friendly_assert (TREE_VEC_LENGTH (tparms
) == TREE_VEC_LENGTH (targs
),
8360 /* If the template is in a namespace, we need to put that into the
8361 mangled name. Unfortunately, build_decl_overload_real does not
8362 get the decl to mangle, so it relies on the current
8363 namespace. Therefore, we set that here temporarily. */
8364 my_friendly_assert (TREE_CODE_CLASS (TREE_CODE (decl
)) == 'd', 980702);
8365 saved_namespace
= current_namespace
;
8366 current_namespace
= CP_DECL_CONTEXT (decl
);
8368 /* Actually set the DCL_ASSEMBLER_NAME. */
8369 DECL_ASSEMBLER_NAME (decl
)
8370 = build_decl_overload_real (DECL_NAME (decl
), parm_types
, ret_type
,
8372 DECL_FUNCTION_MEMBER_P (decl
)
8373 + DECL_CONSTRUCTOR_P (decl
));
8375 /* Restore the previously active namespace. */
8376 current_namespace
= saved_namespace
;