1 /* Process declarations and variables for C++ compiler.
2 Copyright (C) 1988-2017 Free Software Foundation, Inc.
3 Contributed by Michael Tiemann (tiemann@cygnus.com)
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3, or (at your option)
12 GCC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING3. If not see
19 <http://www.gnu.org/licenses/>. */
22 /* Process declarations and symbol lookup for C++ front end.
23 Also constructs types; the standard scalar types at initialization,
24 and structure, union, array and enum types when they are declared. */
26 /* ??? not all decl nodes are given the most useful possible
27 line numbers. For example, the CONST_DECLs for enum values. */
31 #include "coretypes.h"
33 #include "c-family/c-target.h"
36 #include "stringpool.h"
38 #include "stor-layout.h"
42 #include "tree-iterator.h"
46 #include "c-family/c-objc.h"
47 #include "c-family/c-pragma.h"
48 #include "c-family/c-ubsan.h"
54 /* Possible cases of bad specifiers type used by bad_specifiers. */
56 BSP_VAR
, /* variable */
57 BSP_PARM
, /* parameter */
62 static const char *redeclaration_error_message (tree
, tree
);
64 static int decl_jump_unsafe (tree
);
65 static void require_complete_types_for_parms (tree
);
66 static int ambi_op_p (enum tree_code
);
67 static int unary_op_p (enum tree_code
);
68 static void push_local_name (tree
);
69 static tree
grok_reference_init (tree
, tree
, tree
, int);
70 static tree
grokvardecl (tree
, tree
, tree
, const cp_decl_specifier_seq
*,
71 int, int, int, bool, int, tree
);
72 static int check_static_variable_definition (tree
, tree
);
73 static void record_unknown_type (tree
, const char *);
74 static tree
builtin_function_1 (tree
, tree
, bool);
75 static int member_function_or_else (tree
, tree
, enum overload_flags
);
76 static void check_for_uninitialized_const_var (tree
);
77 static tree
local_variable_p_walkfn (tree
*, int *, void *);
78 static const char *tag_name (enum tag_types
);
79 static tree
lookup_and_check_tag (enum tag_types
, tree
, tag_scope
, bool);
80 static int walk_namespaces_r (tree
, walk_namespaces_fn
, void *);
81 static void maybe_deduce_size_from_array_init (tree
, tree
);
82 static void layout_var_decl (tree
);
83 static tree
check_initializer (tree
, tree
, int, vec
<tree
, va_gc
> **);
84 static void make_rtl_for_nonlocal_decl (tree
, tree
, const char *);
85 static void save_function_data (tree
);
86 static void copy_type_enum (tree
, tree
);
87 static void check_function_type (tree
, tree
);
88 static void finish_constructor_body (void);
89 static void begin_destructor_body (void);
90 static void finish_destructor_body (void);
91 static void record_key_method_defined (tree
);
92 static tree
create_array_type_for_decl (tree
, tree
, tree
);
93 static tree
get_atexit_node (void);
94 static tree
get_dso_handle_node (void);
95 static tree
start_cleanup_fn (void);
96 static void end_cleanup_fn (void);
97 static tree
cp_make_fname_decl (location_t
, tree
, int);
98 static void initialize_predefined_identifiers (void);
99 static tree check_special_function_return_type
100 (special_function_kind
, tree
, tree
, int, const location_t
*);
101 static tree
push_cp_library_fn (enum tree_code
, tree
, int);
102 static tree
build_cp_library_fn (tree
, enum tree_code
, tree
, int);
103 static void store_parm_decls (tree
);
104 static void initialize_local_var (tree
, tree
);
105 static void expand_static_init (tree
, tree
);
107 /* The following symbols are subsumed in the cp_global_trees array, and
108 listed here individually for documentation purposes.
111 tree wchar_decl_node;
113 tree vtable_entry_type;
114 tree delta_type_node;
115 tree __t_desc_type_node;
117 tree class_type_node;
118 tree unknown_type_node;
120 Array type `vtable_entry_type[]'
123 tree vtbl_ptr_type_node;
130 A FUNCTION_DECL which can call `abort'. Not necessarily the
131 one that the user will declare, but sufficient to be called
132 by routines that want to abort the program.
137 tree type_info_type_node, tinfo_decl_id, tinfo_decl_type;
138 tree tinfo_var_id; */
140 tree cp_global_trees
[CPTI_MAX
];
142 /* Indicates that there is a type value in some namespace, although
143 that is not necessarily in scope at the moment. */
145 tree global_type_node
;
147 /* The node that holds the "name" of the global scope. */
148 tree global_scope_name
;
150 #define local_names cp_function_chain->x_local_names
152 /* A list of objects which have constructors or destructors
153 which reside in the global scope. The decl is stored in
154 the TREE_VALUE slot and the initializer is stored
155 in the TREE_PURPOSE slot. */
156 tree static_aggregates
;
158 /* Like static_aggregates, but for thread_local variables. */
163 /* A node for the integer constant 2. */
165 tree integer_two_node
;
167 /* Used only for jumps to as-yet undefined labels, since jumps to
168 defined labels can have their validity checked immediately. */
170 struct GTY((chain_next ("%h.next"))) named_label_use_entry
{
171 struct named_label_use_entry
*next
;
172 /* The binding level to which this entry is *currently* attached.
173 This is initially the binding level in which the goto appeared,
174 but is modified as scopes are closed. */
175 cp_binding_level
*binding_level
;
176 /* The head of the names list that was current when the goto appeared,
177 or the inner scope popped. These are the decls that will *not* be
178 skipped when jumping to the label. */
180 /* The location of the goto, for error reporting. */
181 location_t o_goto_locus
;
182 /* True if an OpenMP structured block scope has been closed since
183 the goto appeared. This means that the branch from the label will
184 illegally exit an OpenMP scope. */
188 /* A list of all LABEL_DECLs in the function that have names. Here so
189 we can clear out their names' definitions at the end of the
190 function, and so we can check the validity of jumps to these labels. */
192 struct GTY((for_user
)) named_label_entry
{
193 /* The decl itself. */
196 /* The binding level to which the label is *currently* attached.
197 This is initially set to the binding level in which the label
198 is defined, but is modified as scopes are closed. */
199 cp_binding_level
*binding_level
;
200 /* The head of the names list that was current when the label was
201 defined, or the inner scope popped. These are the decls that will
202 be skipped when jumping to the label. */
204 /* A vector of all decls from all binding levels that would be
205 crossed by a backward branch to the label. */
206 vec
<tree
, va_gc
> *bad_decls
;
208 /* A list of uses of the label, before the label is defined. */
209 struct named_label_use_entry
*uses
;
211 /* The following bits are set after the label is defined, and are
212 updated as scopes are popped. They indicate that a backward jump
213 to the label will illegally enter a scope of the given flavor. */
217 bool in_transaction_scope
;
218 bool in_constexpr_if
;
221 #define named_labels cp_function_chain->x_named_labels
223 /* The number of function bodies which we are currently processing.
224 (Zero if we are at namespace scope, one inside the body of a
225 function, two inside the body of a function in a local class, etc.) */
228 /* Whether the exception-specifier is part of a function type (i.e. C++17). */
229 bool flag_noexcept_type
;
231 /* States indicating how grokdeclarator() should handle declspecs marked
232 with __attribute__((deprecated)). An object declared as
233 __attribute__((deprecated)) suppresses warnings of uses of other
235 enum deprecated_states deprecated_state
= DEPRECATED_NORMAL
;
238 /* A list of VAR_DECLs whose type was incomplete at the time the
239 variable was declared. */
241 struct GTY(()) incomplete_var
{
243 tree incomplete_type
;
247 static GTY(()) vec
<incomplete_var
, va_gc
> *incomplete_vars
;
249 /* Returns the kind of template specialization we are currently
250 processing, given that it's declaration contained N_CLASS_SCOPES
251 explicit scope qualifications. */
254 current_tmpl_spec_kind (int n_class_scopes
)
256 int n_template_parm_scopes
= 0;
257 int seen_specialization_p
= 0;
258 int innermost_specialization_p
= 0;
261 /* Scan through the template parameter scopes. */
262 for (b
= current_binding_level
;
263 b
->kind
== sk_template_parms
;
266 /* If we see a specialization scope inside a parameter scope,
267 then something is wrong. That corresponds to a declaration
270 template <class T> template <> ...
272 which is always invalid since [temp.expl.spec] forbids the
273 specialization of a class member template if the enclosing
274 class templates are not explicitly specialized as well. */
275 if (b
->explicit_spec_p
)
277 if (n_template_parm_scopes
== 0)
278 innermost_specialization_p
= 1;
280 seen_specialization_p
= 1;
282 else if (seen_specialization_p
== 1)
283 return tsk_invalid_member_spec
;
285 ++n_template_parm_scopes
;
288 /* Handle explicit instantiations. */
289 if (processing_explicit_instantiation
)
291 if (n_template_parm_scopes
!= 0)
292 /* We've seen a template parameter list during an explicit
293 instantiation. For example:
295 template <class T> template void f(int);
297 This is erroneous. */
298 return tsk_invalid_expl_inst
;
300 return tsk_expl_inst
;
303 if (n_template_parm_scopes
< n_class_scopes
)
304 /* We've not seen enough template headers to match all the
305 specialized classes present. For example:
307 template <class T> void R<T>::S<T>::f(int);
309 This is invalid; there needs to be one set of template
310 parameters for each class. */
311 return tsk_insufficient_parms
;
312 else if (n_template_parm_scopes
== n_class_scopes
)
313 /* We're processing a non-template declaration (even though it may
314 be a member of a template class.) For example:
316 template <class T> void S<T>::f(int);
318 The `class T' matches the `S<T>', leaving no template headers
319 corresponding to the `f'. */
321 else if (n_template_parm_scopes
> n_class_scopes
+ 1)
322 /* We've got too many template headers. For example:
324 template <> template <class T> void f (T);
326 There need to be more enclosing classes. */
327 return tsk_excessive_parms
;
329 /* This must be a template. It's of the form:
331 template <class T> template <class U> void S<T>::f(U);
333 This is a specialization if the innermost level was a
334 specialization; otherwise it's just a definition of the
336 return innermost_specialization_p
? tsk_expl_spec
: tsk_template
;
339 /* Exit the current scope. */
347 /* When a label goes out of scope, check to see if that label was used
348 in a valid manner, and issue any appropriate warnings or errors. */
351 pop_label (tree label
, tree old_value
)
353 if (!processing_template_decl
)
355 if (DECL_INITIAL (label
) == NULL_TREE
)
359 error ("label %q+D used but not defined", label
);
360 location
= input_location
;
361 /* FIXME want (LOCATION_FILE (input_location), (line)0) */
362 /* Avoid crashing later. */
363 define_label (location
, DECL_NAME (label
));
366 warn_for_unused_label (label
);
369 SET_IDENTIFIER_LABEL_VALUE (DECL_NAME (label
), old_value
);
372 /* Push all named labels into a vector, so that we can sort it on DECL_UID
373 to avoid code generation differences. */
376 note_label (named_label_entry
**slot
, vec
<named_label_entry
**> &labels
)
378 labels
.quick_push (slot
);
382 /* Helper function to sort named label entries in a vector by DECL_UID. */
385 sort_labels (const void *a
, const void *b
)
387 named_label_entry
**slot1
= *(named_label_entry
**const *) a
;
388 named_label_entry
**slot2
= *(named_label_entry
**const *) b
;
389 if (DECL_UID ((*slot1
)->label_decl
) < DECL_UID ((*slot2
)->label_decl
))
391 if (DECL_UID ((*slot1
)->label_decl
) > DECL_UID ((*slot2
)->label_decl
))
396 /* At the end of a function, all labels declared within the function
397 go out of scope. BLOCK is the top-level block for the
401 pop_labels (tree block
)
405 auto_vec
<named_label_entry
**, 32> labels
;
406 named_label_entry
**slot
;
409 /* Push all the labels into a vector and sort them by DECL_UID,
410 so that gaps between DECL_UIDs don't affect code generation. */
411 labels
.reserve_exact (named_labels
->elements ());
412 named_labels
->traverse
<vec
<named_label_entry
**> &, note_label
> (labels
);
413 labels
.qsort (sort_labels
);
414 FOR_EACH_VEC_ELT (labels
, i
, slot
)
416 struct named_label_entry
*ent
= *slot
;
418 pop_label (ent
->label_decl
, NULL_TREE
);
420 /* Put the labels into the "variables" of the top-level block,
421 so debugger can see them. */
422 DECL_CHAIN (ent
->label_decl
) = BLOCK_VARS (block
);
423 BLOCK_VARS (block
) = ent
->label_decl
;
425 named_labels
->clear_slot (slot
);
431 /* At the end of a block with local labels, restore the outer definition. */
434 pop_local_label (tree label
, tree old_value
)
436 struct named_label_entry dummy
;
438 pop_label (label
, old_value
);
440 dummy
.label_decl
= label
;
441 named_label_entry
**slot
= named_labels
->find_slot (&dummy
, NO_INSERT
);
442 named_labels
->clear_slot (slot
);
445 /* The following two routines are used to interface to Objective-C++.
446 The binding level is purposely treated as an opaque type. */
449 objc_get_current_scope (void)
451 return current_binding_level
;
454 /* The following routine is used by the NeXT-style SJLJ exceptions;
455 variables get marked 'volatile' so as to not be clobbered by
456 _setjmp()/_longjmp() calls. All variables in the current scope,
457 as well as parent scopes up to (but not including) ENCLOSING_BLK
458 shall be thusly marked. */
461 objc_mark_locals_volatile (void *enclosing_blk
)
463 cp_binding_level
*scope
;
465 for (scope
= current_binding_level
;
466 scope
&& scope
!= enclosing_blk
;
467 scope
= scope
->level_chain
)
471 for (decl
= scope
->names
; decl
; decl
= TREE_CHAIN (decl
))
472 objc_volatilize_decl (decl
);
474 /* Do not climb up past the current function. */
475 if (scope
->kind
== sk_function_parms
)
480 /* True if B is the level for the condition of a constexpr if. */
483 level_for_constexpr_if (cp_binding_level
*b
)
485 return (b
->kind
== sk_cond
&& b
->this_entity
486 && TREE_CODE (b
->this_entity
) == IF_STMT
487 && IF_STMT_CONSTEXPR_P (b
->this_entity
));
490 /* Update data for defined and undefined labels when leaving a scope. */
493 poplevel_named_label_1 (named_label_entry
**slot
, cp_binding_level
*bl
)
495 named_label_entry
*ent
= *slot
;
496 cp_binding_level
*obl
= bl
->level_chain
;
498 if (ent
->binding_level
== bl
)
502 /* ENT->NAMES_IN_SCOPE may contain a mixture of DECLs and
503 TREE_LISTs representing OVERLOADs, so be careful. */
504 for (decl
= ent
->names_in_scope
; decl
; decl
= (DECL_P (decl
)
506 : TREE_CHAIN (decl
)))
507 if (decl_jump_unsafe (decl
))
508 vec_safe_push (ent
->bad_decls
, decl
);
510 ent
->binding_level
= obl
;
511 ent
->names_in_scope
= obl
->names
;
515 ent
->in_try_scope
= true;
518 ent
->in_catch_scope
= true;
521 ent
->in_omp_scope
= true;
524 ent
->in_transaction_scope
= true;
527 if (level_for_constexpr_if (bl
->level_chain
))
528 ent
->in_constexpr_if
= true;
536 struct named_label_use_entry
*use
;
538 for (use
= ent
->uses
; use
; use
= use
->next
)
539 if (use
->binding_level
== bl
)
541 use
->binding_level
= obl
;
542 use
->names_in_scope
= obl
->names
;
543 if (bl
->kind
== sk_omp
)
544 use
->in_omp_scope
= true;
551 /* Saved errorcount to avoid -Wunused-but-set-{parameter,variable} warnings
552 when errors were reported, except for -Werror-unused-but-set-*. */
553 static int unused_but_set_errorcount
;
555 /* Exit a binding level.
556 Pop the level off, and restore the state of the identifier-decl mappings
557 that were in effect when this level was entered.
559 If KEEP == 1, this level had explicit declarations, so
560 and create a "block" (a BLOCK node) for the level
561 to record its declarations and subblocks for symbol table output.
563 If FUNCTIONBODY is nonzero, this level is the body of a function,
564 so create a block as if KEEP were set and also clear out all
567 If REVERSE is nonzero, reverse the order of decls before putting
568 them into the BLOCK. */
571 poplevel (int keep
, int reverse
, int functionbody
)
574 /* The chain of decls was accumulated in reverse order.
575 Put it into forward order, just for cleanliness. */
580 int leaving_for_scope
;
583 cp_label_binding
*label_bind
;
585 bool subtime
= timevar_cond_start (TV_NAME_LOOKUP
);
590 gcc_assert (current_binding_level
->kind
!= sk_class
);
592 if (current_binding_level
->kind
== sk_cleanup
)
594 subblocks
= functionbody
>= 0 ? current_binding_level
->blocks
: 0;
596 gcc_assert (!vec_safe_length (current_binding_level
->class_shadowed
));
598 /* We used to use KEEP == 2 to indicate that the new block should go
599 at the beginning of the list of blocks at this binding level,
600 rather than the end. This hack is no longer used. */
601 gcc_assert (keep
== 0 || keep
== 1);
603 if (current_binding_level
->keep
)
606 /* Any uses of undefined labels, and any defined labels, now operate
607 under constraints of next binding contour. */
608 if (cfun
&& !functionbody
&& named_labels
)
609 named_labels
->traverse
<cp_binding_level
*, poplevel_named_label_1
>
610 (current_binding_level
);
612 /* Get the decls in the order they were written.
613 Usually current_binding_level->names is in reverse order.
614 But parameter decls were previously put in forward order. */
617 current_binding_level
->names
618 = decls
= nreverse (current_binding_level
->names
);
620 decls
= current_binding_level
->names
;
622 /* If there were any declarations or structure tags in that level,
623 or if this level is a function body,
624 create a BLOCK to record them for the life of this function. */
626 /* Avoid function body block if possible. */
627 if (functionbody
&& subblocks
&& BLOCK_CHAIN (subblocks
) == NULL_TREE
)
629 else if (keep
== 1 || functionbody
)
630 block
= make_node (BLOCK
);
631 if (block
!= NULL_TREE
)
633 BLOCK_VARS (block
) = decls
;
634 BLOCK_SUBBLOCKS (block
) = subblocks
;
637 /* In each subblock, record that this is its superior. */
639 for (link
= subblocks
; link
; link
= BLOCK_CHAIN (link
))
640 BLOCK_SUPERCONTEXT (link
) = block
;
642 /* We still support the old for-scope rules, whereby the variables
643 in a init statement were in scope after the for-statement ended.
644 We only use the new rules if flag_new_for_scope is nonzero. */
646 = current_binding_level
->kind
== sk_for
&& flag_new_for_scope
== 1;
648 /* Before we remove the declarations first check for unused variables. */
649 if ((warn_unused_variable
|| warn_unused_but_set_variable
)
650 && current_binding_level
->kind
!= sk_template_parms
651 && !processing_template_decl
)
652 for (tree d
= getdecls (); d
; d
= TREE_CHAIN (d
))
654 /* There are cases where D itself is a TREE_LIST. See in
655 push_local_binding where the list of decls returned by
656 getdecls is built. */
657 decl
= TREE_CODE (d
) == TREE_LIST
? TREE_VALUE (d
) : d
;
658 tree type
= TREE_TYPE (decl
);
660 && (! TREE_USED (decl
) || !DECL_READ_P (decl
))
661 && ! DECL_IN_SYSTEM_HEADER (decl
)
662 && DECL_NAME (decl
) && ! DECL_ARTIFICIAL (decl
)
663 && type
!= error_mark_node
664 && (!CLASS_TYPE_P (type
)
665 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type
)
666 || lookup_attribute ("warn_unused",
667 TYPE_ATTRIBUTES (TREE_TYPE (decl
)))))
669 if (! TREE_USED (decl
))
670 warning_at (DECL_SOURCE_LOCATION (decl
),
671 OPT_Wunused_variable
, "unused variable %qD", decl
);
672 else if (DECL_CONTEXT (decl
) == current_function_decl
673 // For -Wunused-but-set-variable leave references alone.
674 && TREE_CODE (TREE_TYPE (decl
)) != REFERENCE_TYPE
675 && errorcount
== unused_but_set_errorcount
)
677 warning_at (DECL_SOURCE_LOCATION (decl
),
678 OPT_Wunused_but_set_variable
,
679 "variable %qD set but not used", decl
);
680 unused_but_set_errorcount
= errorcount
;
685 /* Remove declarations for all the DECLs in this level. */
686 for (link
= decls
; link
; link
= TREE_CHAIN (link
))
688 if (leaving_for_scope
&& VAR_P (link
)
689 /* It's hard to make this ARM compatibility hack play nicely with
690 lambdas, and it really isn't necessary in C++11 mode. */
691 && cxx_dialect
< cxx11
694 tree name
= DECL_NAME (link
);
698 ob
= outer_binding (name
,
699 IDENTIFIER_BINDING (name
),
702 ns_binding
= IDENTIFIER_NAMESPACE_VALUE (name
);
704 ns_binding
= NULL_TREE
;
706 if (ob
&& ob
->scope
== current_binding_level
->level_chain
)
707 /* We have something like:
712 and we are leaving the `for' scope. There's no reason to
713 keep the binding of the inner `i' in this case. */
714 pop_binding (name
, link
);
715 else if ((ob
&& (TREE_CODE (ob
->value
) == TYPE_DECL
))
716 || (ns_binding
&& TREE_CODE (ns_binding
) == TYPE_DECL
))
717 /* Here, we have something like:
725 We must pop the for-scope binding so we know what's a
726 type and what isn't. */
727 pop_binding (name
, link
);
730 /* Mark this VAR_DECL as dead so that we can tell we left it
731 there only for backward compatibility. */
732 DECL_DEAD_FOR_LOCAL (link
) = 1;
734 /* Keep track of what should have happened when we
735 popped the binding. */
738 SET_DECL_SHADOWED_FOR_VAR (link
, ob
->value
);
739 DECL_HAS_SHADOWED_FOR_VAR_P (link
) = 1;
742 /* Add it to the list of dead variables in the next
743 outermost binding to that we can remove these when we
744 leave that binding. */
746 current_binding_level
->level_chain
->dead_vars_from_for
,
749 /* Although we don't pop the cxx_binding, we do clear
750 its SCOPE since the scope is going away now. */
751 IDENTIFIER_BINDING (name
)->scope
752 = current_binding_level
->level_chain
;
759 /* Remove the binding. */
762 if (TREE_CODE (decl
) == TREE_LIST
)
763 decl
= TREE_VALUE (decl
);
766 if (TREE_CODE (name
) == OVERLOAD
)
767 name
= OVL_FUNCTION (name
);
769 gcc_assert (DECL_P (name
));
770 pop_binding (DECL_NAME (name
), decl
);
774 /* Remove declarations for any `for' variables from inner scopes
775 that we kept around. */
776 FOR_EACH_VEC_SAFE_ELT_REVERSE (current_binding_level
->dead_vars_from_for
,
778 pop_binding (DECL_NAME (decl
), decl
);
780 /* Restore the IDENTIFIER_TYPE_VALUEs. */
781 for (link
= current_binding_level
->type_shadowed
;
782 link
; link
= TREE_CHAIN (link
))
783 SET_IDENTIFIER_TYPE_VALUE (TREE_PURPOSE (link
), TREE_VALUE (link
));
785 /* Restore the IDENTIFIER_LABEL_VALUEs for local labels. */
786 FOR_EACH_VEC_SAFE_ELT_REVERSE (current_binding_level
->shadowed_labels
,
788 pop_local_label (label_bind
->label
, label_bind
->prev_value
);
790 /* There may be OVERLOADs (wrapped in TREE_LISTs) on the BLOCK_VARs
791 list if a `using' declaration put them there. The debugging
792 back ends won't understand OVERLOAD, so we remove them here.
793 Because the BLOCK_VARS are (temporarily) shared with
794 CURRENT_BINDING_LEVEL->NAMES we must do this fixup after we have
795 popped all the bindings. Also remove undeduced 'auto' decls,
796 which LTO doesn't understand, and can't have been used by anything. */
801 for (d
= &BLOCK_VARS (block
); *d
; )
803 if (TREE_CODE (*d
) == TREE_LIST
804 || (!processing_template_decl
805 && undeduced_auto_decl (*d
)))
806 *d
= TREE_CHAIN (*d
);
808 d
= &DECL_CHAIN (*d
);
812 /* If the level being exited is the top level of a function,
813 check over all the labels. */
818 /* Since this is the top level block of a function, the vars are
819 the function's parameters. Don't leave them in the BLOCK
820 because they are found in the FUNCTION_DECL instead. */
821 BLOCK_VARS (block
) = 0;
825 pop_labels (subblocks
);
828 kind
= current_binding_level
->kind
;
829 if (kind
== sk_cleanup
)
833 /* If this is a temporary binding created for a cleanup, then we'll
834 have pushed a statement list level. Pop that, create a new
835 BIND_EXPR for the block, and insert it into the stream. */
836 stmt
= pop_stmt_list (current_binding_level
->statement_list
);
837 stmt
= c_build_bind_expr (input_location
, block
, stmt
);
844 /* The current function is being defined, so its DECL_INITIAL
845 should be error_mark_node. */
846 gcc_assert (DECL_INITIAL (current_function_decl
) == error_mark_node
);
847 DECL_INITIAL (current_function_decl
) = block
? block
: subblocks
;
850 if (FUNCTION_NEEDS_BODY_BLOCK (current_function_decl
))
852 if (BLOCK_SUBBLOCKS (subblocks
))
853 BLOCK_OUTER_CURLY_BRACE_P (BLOCK_SUBBLOCKS (subblocks
)) = 1;
856 BLOCK_OUTER_CURLY_BRACE_P (subblocks
) = 1;
860 current_binding_level
->blocks
861 = block_chainon (current_binding_level
->blocks
, block
);
863 /* If we did not make a block for the level just exited,
864 any blocks made for inner levels
865 (since they cannot be recorded as subblocks in that level)
866 must be carried forward so they will later become subblocks
867 of something else. */
869 current_binding_level
->blocks
870 = block_chainon (current_binding_level
->blocks
, subblocks
);
872 /* Each and every BLOCK node created here in `poplevel' is important
873 (e.g. for proper debugging information) so if we created one
874 earlier, mark it as "used". */
876 TREE_USED (block
) = 1;
878 /* All temporary bindings created for cleanups are popped silently. */
879 if (kind
== sk_cleanup
)
882 timevar_cond_stop (TV_NAME_LOOKUP
, subtime
);
886 /* Walk all the namespaces contained NAMESPACE, including NAMESPACE
887 itself, calling F for each. The DATA is passed to F as well. */
890 walk_namespaces_r (tree name_space
, walk_namespaces_fn f
, void* data
)
893 tree current
= NAMESPACE_LEVEL (name_space
)->namespaces
;
895 result
|= (*f
) (name_space
, data
);
897 for (; current
; current
= DECL_CHAIN (current
))
898 result
|= walk_namespaces_r (current
, f
, data
);
903 /* Walk all the namespaces, calling F for each. The DATA is passed to
907 walk_namespaces (walk_namespaces_fn f
, void* data
)
909 return walk_namespaces_r (global_namespace
, f
, data
);
912 /* Call wrapup_globals_declarations for the globals in NAMESPACE. */
915 wrapup_globals_for_namespace (tree name_space
, void* data ATTRIBUTE_UNUSED
)
917 cp_binding_level
*level
= NAMESPACE_LEVEL (name_space
);
918 vec
<tree
, va_gc
> *statics
= level
->static_decls
;
919 tree
*vec
= statics
->address ();
920 int len
= statics
->length ();
922 if (warn_unused_function
)
926 FOR_EACH_VEC_SAFE_ELT (statics
, i
, decl
)
927 if (TREE_CODE (decl
) == FUNCTION_DECL
928 && DECL_INITIAL (decl
) == 0
929 && DECL_EXTERNAL (decl
)
930 && !TREE_PUBLIC (decl
)
931 && !DECL_ARTIFICIAL (decl
)
932 && !DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl
)
933 && !TREE_NO_WARNING (decl
))
935 warning_at (DECL_SOURCE_LOCATION (decl
),
936 OPT_Wunused_function
,
937 "%qF declared %<static%> but never defined", decl
);
938 TREE_NO_WARNING (decl
) = 1;
942 /* Write out any globals that need to be output. */
943 return wrapup_global_declarations (vec
, len
);
946 /* Diagnose odr-used extern inline variables without definitions
947 in the current TU. */
949 diagnose_inline_vars_for_namespace (tree name_space
, void *)
951 cp_binding_level
*level
= NAMESPACE_LEVEL (name_space
);
952 vec
<tree
, va_gc
> *statics
= level
->static_decls
;
956 FOR_EACH_VEC_SAFE_ELT (statics
, i
, decl
)
958 && DECL_EXTERNAL (decl
)
959 && DECL_INLINE_VAR_P (decl
)
960 && DECL_ODR_USED (decl
))
961 error_at (DECL_SOURCE_LOCATION (decl
),
962 "odr-used inline variable %qD is not defined", decl
);
967 /* In C++, you don't have to write `struct S' to refer to `S'; you
968 can just use `S'. We accomplish this by creating a TYPE_DECL as
969 if the user had written `typedef struct S S'. Create and return
970 the TYPE_DECL for TYPE. */
973 create_implicit_typedef (tree name
, tree type
)
977 decl
= build_decl (input_location
, TYPE_DECL
, name
, type
);
978 DECL_ARTIFICIAL (decl
) = 1;
979 /* There are other implicit type declarations, like the one *within*
980 a class that allows you to write `S::S'. We must distinguish
982 SET_DECL_IMPLICIT_TYPEDEF_P (decl
);
983 TYPE_NAME (type
) = decl
;
984 TYPE_STUB_DECL (type
) = decl
;
989 /* Remember a local name for name-mangling purposes. */
992 push_local_name (tree decl
)
997 timevar_start (TV_NAME_LOOKUP
);
999 name
= DECL_NAME (decl
);
1001 nelts
= vec_safe_length (local_names
);
1002 for (i
= 0; i
< nelts
; i
++)
1004 t
= (*local_names
)[i
];
1005 if (DECL_NAME (t
) == name
)
1007 if (!DECL_LANG_SPECIFIC (decl
))
1008 retrofit_lang_decl (decl
);
1009 DECL_LANG_SPECIFIC (decl
)->u
.base
.u2sel
= 1;
1010 if (DECL_DISCRIMINATOR_SET_P (t
))
1011 DECL_DISCRIMINATOR (decl
) = DECL_DISCRIMINATOR (t
) + 1;
1013 DECL_DISCRIMINATOR (decl
) = 1;
1015 (*local_names
)[i
] = decl
;
1016 timevar_stop (TV_NAME_LOOKUP
);
1021 vec_safe_push (local_names
, decl
);
1022 timevar_stop (TV_NAME_LOOKUP
);
1025 /* Subroutine of duplicate_decls: return truthvalue of whether
1026 or not types of these decls match.
1028 For C++, we must compare the parameter list so that `int' can match
1029 `int&' in a parameter position, but `int&' is not confused with
1033 decls_match (tree newdecl
, tree olddecl
)
1037 if (newdecl
== olddecl
)
1040 if (TREE_CODE (newdecl
) != TREE_CODE (olddecl
))
1041 /* If the two DECLs are not even the same kind of thing, we're not
1042 interested in their types. */
1045 gcc_assert (DECL_P (newdecl
));
1047 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1049 tree f1
= TREE_TYPE (newdecl
);
1050 tree f2
= TREE_TYPE (olddecl
);
1051 tree p1
= TYPE_ARG_TYPES (f1
);
1052 tree p2
= TYPE_ARG_TYPES (f2
);
1055 /* Specializations of different templates are different functions
1056 even if they have the same type. */
1057 tree t1
= (DECL_USE_TEMPLATE (newdecl
)
1058 ? DECL_TI_TEMPLATE (newdecl
)
1060 tree t2
= (DECL_USE_TEMPLATE (olddecl
)
1061 ? DECL_TI_TEMPLATE (olddecl
)
1066 if (CP_DECL_CONTEXT (newdecl
) != CP_DECL_CONTEXT (olddecl
)
1067 && ! (DECL_EXTERN_C_P (newdecl
)
1068 && DECL_EXTERN_C_P (olddecl
)))
1071 /* A new declaration doesn't match a built-in one unless it
1072 is also extern "C". */
1073 if (DECL_IS_BUILTIN (olddecl
)
1074 && DECL_EXTERN_C_P (olddecl
) && !DECL_EXTERN_C_P (newdecl
))
1077 if (TREE_CODE (f1
) != TREE_CODE (f2
))
1080 /* A declaration with deduced return type should use its pre-deduction
1081 type for declaration matching. */
1082 r2
= fndecl_declared_return_type (olddecl
);
1084 if (same_type_p (TREE_TYPE (f1
), r2
))
1086 if (!prototype_p (f2
) && DECL_EXTERN_C_P (olddecl
)
1087 && (DECL_BUILT_IN (olddecl
)
1088 #ifndef NO_IMPLICIT_EXTERN_C
1089 || (DECL_IN_SYSTEM_HEADER (newdecl
) && !DECL_CLASS_SCOPE_P (newdecl
))
1090 || (DECL_IN_SYSTEM_HEADER (olddecl
) && !DECL_CLASS_SCOPE_P (olddecl
))
1094 types_match
= self_promoting_args_p (p1
);
1095 if (p1
== void_list_node
)
1096 TREE_TYPE (newdecl
) = TREE_TYPE (olddecl
);
1098 #ifndef NO_IMPLICIT_EXTERN_C
1099 else if (!prototype_p (f1
)
1100 && (DECL_EXTERN_C_P (olddecl
)
1101 && DECL_IN_SYSTEM_HEADER (olddecl
)
1102 && !DECL_CLASS_SCOPE_P (olddecl
))
1103 && (DECL_EXTERN_C_P (newdecl
)
1104 && DECL_IN_SYSTEM_HEADER (newdecl
)
1105 && !DECL_CLASS_SCOPE_P (newdecl
)))
1107 types_match
= self_promoting_args_p (p2
);
1108 TREE_TYPE (newdecl
) = TREE_TYPE (olddecl
);
1114 && type_memfn_rqual (f1
) == type_memfn_rqual (f2
)
1115 && (TYPE_ATTRIBUTES (TREE_TYPE (newdecl
)) == NULL_TREE
1116 || comp_type_attributes (TREE_TYPE (newdecl
),
1117 TREE_TYPE (olddecl
)) != 0);
1122 /* The decls dont match if they correspond to two different versions
1123 of the same function. Disallow extern "C" functions to be
1124 versions for now. */
1126 && !DECL_EXTERN_C_P (newdecl
)
1127 && !DECL_EXTERN_C_P (olddecl
)
1128 && targetm
.target_option
.function_versions (newdecl
, olddecl
))
1130 /* Mark functions as versions if necessary. Modify the mangled decl
1131 name if necessary. */
1132 if (DECL_FUNCTION_VERSIONED (newdecl
)
1133 && DECL_FUNCTION_VERSIONED (olddecl
))
1135 if (!DECL_FUNCTION_VERSIONED (newdecl
))
1137 DECL_FUNCTION_VERSIONED (newdecl
) = 1;
1138 if (DECL_ASSEMBLER_NAME_SET_P (newdecl
))
1139 mangle_decl (newdecl
);
1141 if (!DECL_FUNCTION_VERSIONED (olddecl
))
1143 DECL_FUNCTION_VERSIONED (olddecl
) = 1;
1144 if (DECL_ASSEMBLER_NAME_SET_P (olddecl
))
1145 mangle_decl (olddecl
);
1147 cgraph_node::record_function_versions (olddecl
, newdecl
);
1151 else if (TREE_CODE (newdecl
) == TEMPLATE_DECL
)
1153 tree oldres
= DECL_TEMPLATE_RESULT (olddecl
);
1154 tree newres
= DECL_TEMPLATE_RESULT (newdecl
);
1156 if (TREE_CODE (newres
) != TREE_CODE (oldres
))
1159 if (!comp_template_parms (DECL_TEMPLATE_PARMS (newdecl
),
1160 DECL_TEMPLATE_PARMS (olddecl
)))
1163 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl
)) == TYPE_DECL
)
1164 types_match
= (same_type_p (TREE_TYPE (oldres
), TREE_TYPE (newres
))
1165 && equivalently_constrained (olddecl
, newdecl
));
1167 // We don't need to check equivalently_constrained for variable and
1168 // function templates because we check it on the results.
1169 types_match
= decls_match (oldres
, newres
);
1173 /* Need to check scope for variable declaration (VAR_DECL).
1174 For typedef (TYPE_DECL), scope is ignored. */
1176 && CP_DECL_CONTEXT (newdecl
) != CP_DECL_CONTEXT (olddecl
)
1178 Two declarations for an object with C language linkage
1179 with the same name (ignoring the namespace that qualify
1180 it) that appear in different namespace scopes refer to
1182 && !(DECL_EXTERN_C_P (olddecl
) && DECL_EXTERN_C_P (newdecl
)))
1185 if (TREE_TYPE (newdecl
) == error_mark_node
)
1186 types_match
= TREE_TYPE (olddecl
) == error_mark_node
;
1187 else if (TREE_TYPE (olddecl
) == NULL_TREE
)
1188 types_match
= TREE_TYPE (newdecl
) == NULL_TREE
;
1189 else if (TREE_TYPE (newdecl
) == NULL_TREE
)
1192 types_match
= comptypes (TREE_TYPE (newdecl
),
1193 TREE_TYPE (olddecl
),
1194 COMPARE_REDECLARATION
);
1197 // Normal functions can be constrained, as can variable partial
1199 if (types_match
&& VAR_OR_FUNCTION_DECL_P (newdecl
))
1200 types_match
= equivalently_constrained (newdecl
, olddecl
);
1205 /* If NEWDECL is `static' and an `extern' was seen previously,
1206 warn about it. OLDDECL is the previous declaration.
1208 Note that this does not apply to the C++ case of declaring
1209 a variable `extern const' and then later `const'.
1211 Don't complain about built-in functions, since they are beyond
1212 the user's control. */
1215 warn_extern_redeclared_static (tree newdecl
, tree olddecl
)
1217 if (TREE_CODE (newdecl
) == TYPE_DECL
1218 || TREE_CODE (newdecl
) == TEMPLATE_DECL
1219 || TREE_CODE (newdecl
) == CONST_DECL
1220 || TREE_CODE (newdecl
) == NAMESPACE_DECL
)
1223 /* Don't get confused by static member functions; that's a different
1225 if (TREE_CODE (newdecl
) == FUNCTION_DECL
1226 && DECL_STATIC_FUNCTION_P (newdecl
))
1229 /* If the old declaration was `static', or the new one isn't, then
1230 everything is OK. */
1231 if (DECL_THIS_STATIC (olddecl
) || !DECL_THIS_STATIC (newdecl
))
1234 /* It's OK to declare a builtin function as `static'. */
1235 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1236 && DECL_ARTIFICIAL (olddecl
))
1239 if (permerror (DECL_SOURCE_LOCATION (newdecl
),
1240 "%qD was declared %<extern%> and later %<static%>", newdecl
))
1241 inform (DECL_SOURCE_LOCATION (olddecl
),
1242 "previous declaration of %qD", olddecl
);
1245 /* NEW_DECL is a redeclaration of OLD_DECL; both are functions or
1246 function templates. If their exception specifications do not
1247 match, issue a diagnostic. */
1250 check_redeclaration_exception_specification (tree new_decl
,
1253 tree new_exceptions
= TYPE_RAISES_EXCEPTIONS (TREE_TYPE (new_decl
));
1254 tree old_exceptions
= TYPE_RAISES_EXCEPTIONS (TREE_TYPE (old_decl
));
1256 /* Two default specs are equivalent, don't force evaluation. */
1257 if (UNEVALUATED_NOEXCEPT_SPEC_P (new_exceptions
)
1258 && UNEVALUATED_NOEXCEPT_SPEC_P (old_exceptions
))
1261 maybe_instantiate_noexcept (new_decl
);
1262 maybe_instantiate_noexcept (old_decl
);
1263 new_exceptions
= TYPE_RAISES_EXCEPTIONS (TREE_TYPE (new_decl
));
1264 old_exceptions
= TYPE_RAISES_EXCEPTIONS (TREE_TYPE (old_decl
));
1268 If any declaration of a function has an exception-specification,
1269 all declarations, including the definition and an explicit
1270 specialization, of that function shall have an
1271 exception-specification with the same set of type-ids. */
1272 if (! DECL_IS_BUILTIN (old_decl
)
1273 && !comp_except_specs (new_exceptions
, old_exceptions
, ce_normal
))
1276 = "declaration of %qF has a different exception specifier";
1277 bool complained
= true;
1278 location_t new_loc
= DECL_SOURCE_LOCATION (new_decl
);
1279 if (DECL_IN_SYSTEM_HEADER (old_decl
))
1280 complained
= pedwarn (new_loc
, OPT_Wsystem_headers
, msg
, new_decl
);
1281 else if (!flag_exceptions
)
1282 /* We used to silently permit mismatched eh specs with
1283 -fno-exceptions, so make them a pedwarn now. */
1284 complained
= pedwarn (new_loc
, OPT_Wpedantic
, msg
, new_decl
);
1286 error_at (new_loc
, msg
, new_decl
);
1288 inform (DECL_SOURCE_LOCATION (old_decl
),
1289 "from previous declaration %qF", old_decl
);
1293 /* Return true if OLD_DECL and NEW_DECL agree on constexprness.
1294 Otherwise issue diagnostics. */
1297 validate_constexpr_redeclaration (tree old_decl
, tree new_decl
)
1299 old_decl
= STRIP_TEMPLATE (old_decl
);
1300 new_decl
= STRIP_TEMPLATE (new_decl
);
1301 if (!VAR_OR_FUNCTION_DECL_P (old_decl
)
1302 || !VAR_OR_FUNCTION_DECL_P (new_decl
))
1304 if (DECL_DECLARED_CONSTEXPR_P (old_decl
)
1305 == DECL_DECLARED_CONSTEXPR_P (new_decl
))
1307 if (TREE_CODE (old_decl
) == FUNCTION_DECL
)
1309 if (DECL_BUILT_IN (old_decl
))
1311 /* Hide a built-in declaration. */
1312 DECL_DECLARED_CONSTEXPR_P (old_decl
)
1313 = DECL_DECLARED_CONSTEXPR_P (new_decl
);
1316 /* 7.1.5 [dcl.constexpr]
1317 Note: An explicit specialization can differ from the template
1318 declaration with respect to the constexpr specifier. */
1319 if (! DECL_TEMPLATE_SPECIALIZATION (old_decl
)
1320 && DECL_TEMPLATE_SPECIALIZATION (new_decl
))
1323 error_at (DECL_SOURCE_LOCATION (new_decl
),
1324 "redeclaration %qD differs in %<constexpr%> "
1325 "from previous declaration", new_decl
);
1326 inform (DECL_SOURCE_LOCATION (old_decl
),
1327 "previous declaration %qD", old_decl
);
1333 // If OLDDECL and NEWDECL are concept declarations with the same type
1334 // (i.e., and template parameters), but different requirements,
1335 // emit diagnostics and return true. Otherwise, return false.
1337 check_concept_refinement (tree olddecl
, tree newdecl
)
1339 if (!DECL_DECLARED_CONCEPT_P (olddecl
) || !DECL_DECLARED_CONCEPT_P (newdecl
))
1342 tree d1
= DECL_TEMPLATE_RESULT (olddecl
);
1343 tree d2
= DECL_TEMPLATE_RESULT (newdecl
);
1344 if (TREE_CODE (d1
) != TREE_CODE (d2
))
1347 tree t1
= TREE_TYPE (d1
);
1348 tree t2
= TREE_TYPE (d2
);
1349 if (TREE_CODE (d1
) == FUNCTION_DECL
)
1351 if (compparms (TYPE_ARG_TYPES (t1
), TYPE_ARG_TYPES (t2
))
1352 && comp_template_parms (DECL_TEMPLATE_PARMS (olddecl
),
1353 DECL_TEMPLATE_PARMS (newdecl
))
1354 && !equivalently_constrained (olddecl
, newdecl
))
1356 error ("cannot specialize concept %q#D", olddecl
);
1363 /* DECL is a redeclaration of a function or function template. If
1364 it does have default arguments issue a diagnostic. Note: this
1365 function is used to enforce the requirements in C++11 8.3.6 about
1366 no default arguments in redeclarations. */
1369 check_redeclaration_no_default_args (tree decl
)
1371 gcc_assert (DECL_DECLARES_FUNCTION_P (decl
));
1373 for (tree t
= FUNCTION_FIRST_USER_PARMTYPE (decl
);
1374 t
&& t
!= void_list_node
; t
= TREE_CHAIN (t
))
1375 if (TREE_PURPOSE (t
))
1377 permerror (DECL_SOURCE_LOCATION (decl
),
1378 "redeclaration of %q#D may not have default "
1384 #define GNU_INLINE_P(fn) (DECL_DECLARED_INLINE_P (fn) \
1385 && lookup_attribute ("gnu_inline", \
1386 DECL_ATTRIBUTES (fn)))
1388 /* If NEWDECL is a redeclaration of OLDDECL, merge the declarations.
1389 If the redeclaration is invalid, a diagnostic is issued, and the
1390 error_mark_node is returned. Otherwise, OLDDECL is returned.
1392 If NEWDECL is not a redeclaration of OLDDECL, NULL_TREE is
1395 NEWDECL_IS_FRIEND is true if NEWDECL was declared as a friend. */
1398 duplicate_decls (tree newdecl
, tree olddecl
, bool newdecl_is_friend
)
1400 unsigned olddecl_uid
= DECL_UID (olddecl
);
1401 int olddecl_friend
= 0, types_match
= 0, hidden_friend
= 0;
1402 int new_defines_function
= 0;
1403 tree new_template_info
;
1405 if (newdecl
== olddecl
)
1408 types_match
= decls_match (newdecl
, olddecl
);
1410 /* If either the type of the new decl or the type of the old decl is an
1411 error_mark_node, then that implies that we have already issued an
1412 error (earlier) for some bogus type specification, and in that case,
1413 it is rather pointless to harass the user with yet more error message
1414 about the same declaration, so just pretend the types match here. */
1415 if (TREE_TYPE (newdecl
) == error_mark_node
1416 || TREE_TYPE (olddecl
) == error_mark_node
)
1417 return error_mark_node
;
1419 if (UDLIT_OPER_P (DECL_NAME (newdecl
))
1420 && UDLIT_OPER_P (DECL_NAME (olddecl
)))
1422 if (TREE_CODE (newdecl
) == TEMPLATE_DECL
1423 && TREE_CODE (olddecl
) != TEMPLATE_DECL
1424 && check_raw_literal_operator (olddecl
))
1425 error ("literal operator template %q+D conflicts with"
1426 " raw literal operator %qD", newdecl
, olddecl
);
1427 else if (TREE_CODE (newdecl
) != TEMPLATE_DECL
1428 && TREE_CODE (olddecl
) == TEMPLATE_DECL
1429 && check_raw_literal_operator (newdecl
))
1430 error ("raw literal operator %q+D conflicts with"
1431 " literal operator template %qD", newdecl
, olddecl
);
1434 if (DECL_P (olddecl
)
1435 && TREE_CODE (newdecl
) == FUNCTION_DECL
1436 && TREE_CODE (olddecl
) == FUNCTION_DECL
1437 && diagnose_mismatched_attributes (olddecl
, newdecl
))
1439 if (DECL_INITIAL (olddecl
))
1440 inform (DECL_SOURCE_LOCATION (olddecl
),
1441 "previous definition of %qD was here", olddecl
);
1443 inform (DECL_SOURCE_LOCATION (olddecl
),
1444 "previous declaration of %qD was here", olddecl
);
1447 /* Check for redeclaration and other discrepancies. */
1448 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1449 && DECL_ARTIFICIAL (olddecl
))
1451 gcc_assert (!DECL_HIDDEN_FRIEND_P (olddecl
));
1452 if (TREE_CODE (newdecl
) != FUNCTION_DECL
)
1454 /* Avoid warnings redeclaring built-ins which have not been
1455 explicitly declared. */
1456 if (DECL_ANTICIPATED (olddecl
))
1459 /* If you declare a built-in or predefined function name as static,
1460 the old definition is overridden, but optionally warn this was a
1461 bad choice of name. */
1462 if (! TREE_PUBLIC (newdecl
))
1464 warning (OPT_Wshadow
,
1465 DECL_BUILT_IN (olddecl
)
1466 ? G_("shadowing built-in function %q#D")
1467 : G_("shadowing library function %q#D"), olddecl
);
1468 /* Discard the old built-in function. */
1471 /* If the built-in is not ansi, then programs can override
1472 it even globally without an error. */
1473 else if (! DECL_BUILT_IN (olddecl
))
1474 warning_at (DECL_SOURCE_LOCATION (newdecl
), 0,
1475 "library function %q#D redeclared as non-function %q#D",
1478 error ("declaration of %q+#D conflicts with built-in "
1479 "declaration %q#D", newdecl
, olddecl
);
1482 else if (DECL_OMP_DECLARE_REDUCTION_P (olddecl
))
1484 gcc_assert (DECL_OMP_DECLARE_REDUCTION_P (newdecl
));
1485 error_at (DECL_SOURCE_LOCATION (newdecl
),
1486 "redeclaration of %<pragma omp declare reduction%>");
1487 inform (DECL_SOURCE_LOCATION (olddecl
),
1488 "previous %<pragma omp declare reduction%> declaration");
1489 return error_mark_node
;
1491 else if (!types_match
)
1493 /* Avoid warnings redeclaring built-ins which have not been
1494 explicitly declared. */
1495 if (DECL_ANTICIPATED (olddecl
))
1499 /* A new declaration doesn't match a built-in one unless it
1500 is also extern "C". */
1501 gcc_assert (DECL_IS_BUILTIN (olddecl
));
1502 gcc_assert (DECL_EXTERN_C_P (olddecl
));
1503 if (!DECL_EXTERN_C_P (newdecl
))
1506 for (t1
= TYPE_ARG_TYPES (TREE_TYPE (newdecl
)),
1507 t2
= TYPE_ARG_TYPES (TREE_TYPE (olddecl
));
1509 t1
= TREE_CHAIN (t1
), t2
= TREE_CHAIN (t2
))
1512 /* Deal with fileptr_type_node. FILE type is not known
1513 at the time we create the builtins. */
1514 else if (TREE_VALUE (t2
) == fileptr_type_node
)
1516 tree t
= TREE_VALUE (t1
);
1519 && TYPE_IDENTIFIER (TREE_TYPE (t
))
1520 == get_identifier ("FILE")
1521 && compparms (TREE_CHAIN (t1
), TREE_CHAIN (t2
)))
1523 tree oldargs
= TYPE_ARG_TYPES (TREE_TYPE (olddecl
));
1525 TYPE_ARG_TYPES (TREE_TYPE (olddecl
))
1526 = TYPE_ARG_TYPES (TREE_TYPE (newdecl
));
1527 types_match
= decls_match (newdecl
, olddecl
);
1529 return duplicate_decls (newdecl
, olddecl
,
1531 TYPE_ARG_TYPES (TREE_TYPE (olddecl
)) = oldargs
;
1534 /* Likewise for const struct tm*. */
1535 else if (TREE_VALUE (t2
) == const_tm_ptr_type_node
)
1537 tree t
= TREE_VALUE (t1
);
1540 && TYPE_IDENTIFIER (TREE_TYPE (t
))
1541 == get_identifier ("tm")
1542 && compparms (TREE_CHAIN (t1
), TREE_CHAIN (t2
)))
1544 tree oldargs
= TYPE_ARG_TYPES (TREE_TYPE (olddecl
));
1546 TYPE_ARG_TYPES (TREE_TYPE (olddecl
))
1547 = TYPE_ARG_TYPES (TREE_TYPE (newdecl
));
1548 types_match
= decls_match (newdecl
, olddecl
);
1550 return duplicate_decls (newdecl
, olddecl
,
1552 TYPE_ARG_TYPES (TREE_TYPE (olddecl
)) = oldargs
;
1555 else if (! same_type_p (TREE_VALUE (t1
), TREE_VALUE (t2
)))
1558 warning_at (DECL_SOURCE_LOCATION (newdecl
),
1559 OPT_Wbuiltin_declaration_mismatch
,
1560 "declaration of %q+#D conflicts with built-in "
1561 "declaration %q#D", newdecl
, olddecl
);
1563 else if ((DECL_EXTERN_C_P (newdecl
)
1564 && DECL_EXTERN_C_P (olddecl
))
1565 || compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl
)),
1566 TYPE_ARG_TYPES (TREE_TYPE (olddecl
))))
1568 /* A near match; override the builtin. */
1570 if (TREE_PUBLIC (newdecl
))
1571 warning_at (DECL_SOURCE_LOCATION (newdecl
),
1572 OPT_Wbuiltin_declaration_mismatch
,
1573 "new declaration %q#D ambiguates built-in "
1574 "declaration %q#D", newdecl
, olddecl
);
1576 warning (OPT_Wshadow
,
1577 DECL_BUILT_IN (olddecl
)
1578 ? G_("shadowing built-in function %q#D")
1579 : G_("shadowing library function %q#D"), olddecl
);
1582 /* Discard the old built-in function. */
1585 /* Replace the old RTL to avoid problems with inlining. */
1586 COPY_DECL_RTL (newdecl
, olddecl
);
1588 /* Even if the types match, prefer the new declarations type for
1589 built-ins which have not been explicitly declared, for
1590 exception lists, etc... */
1591 else if (DECL_IS_BUILTIN (olddecl
))
1593 tree type
= TREE_TYPE (newdecl
);
1594 tree attribs
= (*targetm
.merge_type_attributes
)
1595 (TREE_TYPE (olddecl
), type
);
1597 type
= cp_build_type_attribute_variant (type
, attribs
);
1598 TREE_TYPE (newdecl
) = TREE_TYPE (olddecl
) = type
;
1601 /* If a function is explicitly declared "throw ()", propagate that to
1602 the corresponding builtin. */
1603 if (DECL_BUILT_IN_CLASS (olddecl
) == BUILT_IN_NORMAL
1604 && DECL_ANTICIPATED (olddecl
)
1605 && TREE_NOTHROW (newdecl
)
1606 && !TREE_NOTHROW (olddecl
))
1608 enum built_in_function fncode
= DECL_FUNCTION_CODE (olddecl
);
1609 tree tmpdecl
= builtin_decl_explicit (fncode
);
1610 if (tmpdecl
&& tmpdecl
!= olddecl
&& types_match
)
1611 TREE_NOTHROW (tmpdecl
) = 1;
1614 /* Whether or not the builtin can throw exceptions has no
1615 bearing on this declarator. */
1616 TREE_NOTHROW (olddecl
) = 0;
1618 if (DECL_THIS_STATIC (newdecl
) && !DECL_THIS_STATIC (olddecl
))
1620 /* If a builtin function is redeclared as `static', merge
1621 the declarations, but make the original one static. */
1622 DECL_THIS_STATIC (olddecl
) = 1;
1623 TREE_PUBLIC (olddecl
) = 0;
1625 /* Make the old declaration consistent with the new one so
1626 that all remnants of the builtin-ness of this function
1627 will be banished. */
1628 SET_DECL_LANGUAGE (olddecl
, DECL_LANGUAGE (newdecl
));
1629 COPY_DECL_RTL (newdecl
, olddecl
);
1632 else if (TREE_CODE (olddecl
) != TREE_CODE (newdecl
))
1634 /* C++ Standard, 3.3, clause 4:
1635 "[Note: a namespace name or a class template name must be unique
1636 in its declarative region (7.3.2, clause 14). ]" */
1637 if (TREE_CODE (olddecl
) != NAMESPACE_DECL
1638 && TREE_CODE (newdecl
) != NAMESPACE_DECL
1639 && (TREE_CODE (olddecl
) != TEMPLATE_DECL
1640 || TREE_CODE (DECL_TEMPLATE_RESULT (olddecl
)) != TYPE_DECL
)
1641 && (TREE_CODE (newdecl
) != TEMPLATE_DECL
1642 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl
)) != TYPE_DECL
))
1644 if ((TREE_CODE (olddecl
) == TYPE_DECL
&& DECL_ARTIFICIAL (olddecl
)
1645 && TREE_CODE (newdecl
) != TYPE_DECL
)
1646 || (TREE_CODE (newdecl
) == TYPE_DECL
&& DECL_ARTIFICIAL (newdecl
)
1647 && TREE_CODE (olddecl
) != TYPE_DECL
))
1649 /* We do nothing special here, because C++ does such nasty
1650 things with TYPE_DECLs. Instead, just let the TYPE_DECL
1651 get shadowed, and know that if we need to find a TYPE_DECL
1652 for a given name, we can look in the IDENTIFIER_TYPE_VALUE
1653 slot of the identifier. */
1657 if ((TREE_CODE (newdecl
) == FUNCTION_DECL
1658 && DECL_FUNCTION_TEMPLATE_P (olddecl
))
1659 || (TREE_CODE (olddecl
) == FUNCTION_DECL
1660 && DECL_FUNCTION_TEMPLATE_P (newdecl
)))
1664 error ("%q#D redeclared as different kind of symbol", newdecl
);
1665 if (TREE_CODE (olddecl
) == TREE_LIST
)
1666 olddecl
= TREE_VALUE (olddecl
);
1667 inform (DECL_SOURCE_LOCATION (olddecl
),
1668 "previous declaration %q#D", olddecl
);
1670 return error_mark_node
;
1672 else if (!types_match
)
1674 if (CP_DECL_CONTEXT (newdecl
) != CP_DECL_CONTEXT (olddecl
))
1675 /* These are certainly not duplicate declarations; they're
1676 from different scopes. */
1679 if (TREE_CODE (newdecl
) == TEMPLATE_DECL
)
1681 /* The name of a class template may not be declared to refer to
1682 any other template, class, function, object, namespace, value,
1683 or type in the same scope. */
1684 if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl
)) == TYPE_DECL
1685 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl
)) == TYPE_DECL
)
1687 error ("conflicting declaration of template %q+#D", newdecl
);
1688 inform (DECL_SOURCE_LOCATION (olddecl
),
1689 "previous declaration %q#D", olddecl
);
1690 return error_mark_node
;
1692 else if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl
)) == FUNCTION_DECL
1693 && TREE_CODE (DECL_TEMPLATE_RESULT (newdecl
)) == FUNCTION_DECL
1694 && compparms (TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl
))),
1695 TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl
))))
1696 && comp_template_parms (DECL_TEMPLATE_PARMS (newdecl
),
1697 DECL_TEMPLATE_PARMS (olddecl
))
1698 /* Template functions can be disambiguated by
1700 && same_type_p (TREE_TYPE (TREE_TYPE (newdecl
)),
1701 TREE_TYPE (TREE_TYPE (olddecl
)))
1702 // Template functions can also be disambiguated by
1704 && equivalently_constrained (olddecl
, newdecl
))
1706 error ("ambiguating new declaration %q+#D", newdecl
);
1707 inform (DECL_SOURCE_LOCATION (olddecl
),
1708 "old declaration %q#D", olddecl
);
1710 else if (check_concept_refinement (olddecl
, newdecl
))
1711 return error_mark_node
;
1714 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1716 if (DECL_EXTERN_C_P (newdecl
) && DECL_EXTERN_C_P (olddecl
))
1718 error ("conflicting declaration of C function %q+#D",
1720 inform (DECL_SOURCE_LOCATION (olddecl
),
1721 "previous declaration %q#D", olddecl
);
1724 /* For function versions, params and types match, but they
1725 are not ambiguous. */
1726 else if ((!DECL_FUNCTION_VERSIONED (newdecl
)
1727 && !DECL_FUNCTION_VERSIONED (olddecl
))
1728 // The functions have the same parameter types.
1729 && compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl
)),
1730 TYPE_ARG_TYPES (TREE_TYPE (olddecl
)))
1731 // And the same constraints.
1732 && equivalently_constrained (newdecl
, olddecl
))
1734 error ("ambiguating new declaration of %q+#D", newdecl
);
1735 inform (DECL_SOURCE_LOCATION (olddecl
),
1736 "old declaration %q#D", olddecl
);
1737 return error_mark_node
;
1744 error ("conflicting declaration %q+#D", newdecl
);
1745 inform (DECL_SOURCE_LOCATION (olddecl
),
1746 "previous declaration as %q#D", olddecl
);
1747 return error_mark_node
;
1750 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
1751 && ((DECL_TEMPLATE_SPECIALIZATION (olddecl
)
1752 && (!DECL_TEMPLATE_INFO (newdecl
)
1753 || (DECL_TI_TEMPLATE (newdecl
)
1754 != DECL_TI_TEMPLATE (olddecl
))))
1755 || (DECL_TEMPLATE_SPECIALIZATION (newdecl
)
1756 && (!DECL_TEMPLATE_INFO (olddecl
)
1757 || (DECL_TI_TEMPLATE (olddecl
)
1758 != DECL_TI_TEMPLATE (newdecl
))))))
1759 /* It's OK to have a template specialization and a non-template
1760 with the same type, or to have specializations of two
1761 different templates with the same type. Note that if one is a
1762 specialization, and the other is an instantiation of the same
1763 template, that we do not exit at this point. That situation
1764 can occur if we instantiate a template class, and then
1765 specialize one of its methods. This situation is valid, but
1766 the declarations must be merged in the usual way. */
1768 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
1769 && ((DECL_TEMPLATE_INSTANTIATION (olddecl
)
1770 && !DECL_USE_TEMPLATE (newdecl
))
1771 || (DECL_TEMPLATE_INSTANTIATION (newdecl
)
1772 && !DECL_USE_TEMPLATE (olddecl
))))
1773 /* One of the declarations is a template instantiation, and the
1774 other is not a template at all. That's OK. */
1776 else if (TREE_CODE (newdecl
) == NAMESPACE_DECL
)
1778 /* In [namespace.alias] we have:
1780 In a declarative region, a namespace-alias-definition can be
1781 used to redefine a namespace-alias declared in that declarative
1782 region to refer only to the namespace to which it already
1785 Therefore, if we encounter a second alias directive for the same
1786 alias, we can just ignore the second directive. */
1787 if (DECL_NAMESPACE_ALIAS (newdecl
)
1788 && (DECL_NAMESPACE_ALIAS (newdecl
)
1789 == DECL_NAMESPACE_ALIAS (olddecl
)))
1791 /* [namespace.alias]
1793 A namespace-name or namespace-alias shall not be declared as
1794 the name of any other entity in the same declarative region.
1795 A namespace-name defined at global scope shall not be
1796 declared as the name of any other entity in any global scope
1798 error ("conflicting declaration of namespace %q+D", newdecl
);
1799 inform (DECL_SOURCE_LOCATION (olddecl
),
1800 "previous declaration of namespace %qD here", olddecl
);
1801 return error_mark_node
;
1805 const char *errmsg
= redeclaration_error_message (newdecl
, olddecl
);
1808 error_at (DECL_SOURCE_LOCATION (newdecl
), errmsg
, newdecl
);
1809 if (DECL_NAME (olddecl
) != NULL_TREE
)
1810 inform (DECL_SOURCE_LOCATION (olddecl
),
1811 (DECL_INITIAL (olddecl
) && namespace_bindings_p ())
1812 ? G_("%q#D previously defined here")
1813 : G_("%q#D previously declared here"), olddecl
);
1814 return error_mark_node
;
1816 else if (TREE_CODE (olddecl
) == FUNCTION_DECL
1817 && DECL_INITIAL (olddecl
) != NULL_TREE
1818 && !prototype_p (TREE_TYPE (olddecl
))
1819 && prototype_p (TREE_TYPE (newdecl
)))
1821 /* Prototype decl follows defn w/o prototype. */
1822 if (warning_at (DECL_SOURCE_LOCATION (newdecl
), 0,
1823 "prototype specified for %q#D", newdecl
))
1824 inform (DECL_SOURCE_LOCATION (olddecl
),
1825 "previous non-prototype definition here");
1827 else if (VAR_OR_FUNCTION_DECL_P (olddecl
)
1828 && DECL_LANGUAGE (newdecl
) != DECL_LANGUAGE (olddecl
))
1831 If two declarations of the same function or object
1832 specify different linkage-specifications ..., the program
1833 is ill-formed.... Except for functions with C++ linkage,
1834 a function declaration without a linkage specification
1835 shall not precede the first linkage specification for
1836 that function. A function can be declared without a
1837 linkage specification after an explicit linkage
1838 specification has been seen; the linkage explicitly
1839 specified in the earlier declaration is not affected by
1840 such a function declaration.
1842 DR 563 raises the question why the restrictions on
1843 functions should not also apply to objects. Older
1844 versions of G++ silently ignore the linkage-specification
1852 which is clearly wrong. Therefore, we now treat objects
1854 if (current_lang_depth () == 0)
1856 /* There is no explicit linkage-specification, so we use
1857 the linkage from the previous declaration. */
1858 if (!DECL_LANG_SPECIFIC (newdecl
))
1859 retrofit_lang_decl (newdecl
);
1860 SET_DECL_LANGUAGE (newdecl
, DECL_LANGUAGE (olddecl
));
1864 error ("conflicting declaration of %q+#D with %qL linkage",
1865 newdecl
, DECL_LANGUAGE (newdecl
));
1866 inform (DECL_SOURCE_LOCATION (olddecl
),
1867 "previous declaration with %qL linkage",
1868 DECL_LANGUAGE (olddecl
));
1872 if (DECL_LANG_SPECIFIC (olddecl
) && DECL_USE_TEMPLATE (olddecl
))
1874 else if (TREE_CODE (olddecl
) == FUNCTION_DECL
)
1876 /* Note: free functions, as TEMPLATE_DECLs, are handled below. */
1877 if (DECL_FUNCTION_MEMBER_P (olddecl
)
1878 && (/* grokfndecl passes member function templates too
1879 as FUNCTION_DECLs. */
1880 DECL_TEMPLATE_INFO (olddecl
)
1882 Default arguments for a member function of a class
1883 template shall be specified on the initial declaration
1884 of the member function within the class template. */
1885 || CLASSTYPE_TEMPLATE_INFO (CP_DECL_CONTEXT (olddecl
))))
1886 check_redeclaration_no_default_args (newdecl
);
1889 tree t1
= FUNCTION_FIRST_USER_PARMTYPE (olddecl
);
1890 tree t2
= FUNCTION_FIRST_USER_PARMTYPE (newdecl
);
1893 for (; t1
&& t1
!= void_list_node
;
1894 t1
= TREE_CHAIN (t1
), t2
= TREE_CHAIN (t2
), i
++)
1895 if (TREE_PURPOSE (t1
) && TREE_PURPOSE (t2
))
1897 if (1 == simple_cst_equal (TREE_PURPOSE (t1
),
1900 if (permerror (input_location
,
1901 "default argument given for parameter "
1902 "%d of %q#D", i
, newdecl
))
1903 inform (DECL_SOURCE_LOCATION (olddecl
),
1904 "previous specification in %q#D here",
1909 error ("default argument given for parameter %d "
1910 "of %q#D", i
, newdecl
);
1911 inform (DECL_SOURCE_LOCATION (olddecl
),
1912 "previous specification in %q#D here",
1920 /* Do not merge an implicit typedef with an explicit one. In:
1924 typedef class A A __attribute__ ((foo));
1926 the attribute should apply only to the typedef. */
1927 if (TREE_CODE (olddecl
) == TYPE_DECL
1928 && (DECL_IMPLICIT_TYPEDEF_P (olddecl
)
1929 || DECL_IMPLICIT_TYPEDEF_P (newdecl
)))
1932 /* If new decl is `static' and an `extern' was seen previously,
1934 warn_extern_redeclared_static (newdecl
, olddecl
);
1936 if (!validate_constexpr_redeclaration (olddecl
, newdecl
))
1937 return error_mark_node
;
1939 /* We have committed to returning 1 at this point. */
1940 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1942 /* Now that functions must hold information normally held
1943 by field decls, there is extra work to do so that
1944 declaration information does not get destroyed during
1946 if (DECL_VINDEX (olddecl
))
1947 DECL_VINDEX (newdecl
) = DECL_VINDEX (olddecl
);
1948 if (DECL_CONTEXT (olddecl
))
1949 DECL_CONTEXT (newdecl
) = DECL_CONTEXT (olddecl
);
1950 DECL_STATIC_CONSTRUCTOR (newdecl
) |= DECL_STATIC_CONSTRUCTOR (olddecl
);
1951 DECL_STATIC_DESTRUCTOR (newdecl
) |= DECL_STATIC_DESTRUCTOR (olddecl
);
1952 DECL_PURE_VIRTUAL_P (newdecl
) |= DECL_PURE_VIRTUAL_P (olddecl
);
1953 DECL_VIRTUAL_P (newdecl
) |= DECL_VIRTUAL_P (olddecl
);
1954 DECL_INVALID_OVERRIDER_P (newdecl
) |= DECL_INVALID_OVERRIDER_P (olddecl
);
1955 DECL_FINAL_P (newdecl
) |= DECL_FINAL_P (olddecl
);
1956 DECL_OVERRIDE_P (newdecl
) |= DECL_OVERRIDE_P (olddecl
);
1957 DECL_THIS_STATIC (newdecl
) |= DECL_THIS_STATIC (olddecl
);
1958 if (DECL_OVERLOADED_OPERATOR_P (olddecl
) != ERROR_MARK
)
1959 SET_OVERLOADED_OPERATOR_CODE
1960 (newdecl
, DECL_OVERLOADED_OPERATOR_P (olddecl
));
1961 new_defines_function
= DECL_INITIAL (newdecl
) != NULL_TREE
;
1963 /* Optionally warn about more than one declaration for the same
1964 name, but don't warn about a function declaration followed by a
1966 if (warn_redundant_decls
&& ! DECL_ARTIFICIAL (olddecl
)
1967 && !(new_defines_function
&& DECL_INITIAL (olddecl
) == NULL_TREE
)
1968 /* Don't warn about extern decl followed by definition. */
1969 && !(DECL_EXTERNAL (olddecl
) && ! DECL_EXTERNAL (newdecl
))
1970 /* Don't warn about friends, let add_friend take care of it. */
1971 && ! (newdecl_is_friend
|| DECL_FRIEND_P (olddecl
))
1972 /* Don't warn about declaration followed by specialization. */
1973 && (! DECL_TEMPLATE_SPECIALIZATION (newdecl
)
1974 || DECL_TEMPLATE_SPECIALIZATION (olddecl
)))
1976 if (warning_at (DECL_SOURCE_LOCATION (newdecl
),
1977 OPT_Wredundant_decls
,
1978 "redundant redeclaration of %qD in same scope",
1980 inform (DECL_SOURCE_LOCATION (olddecl
),
1981 "previous declaration of %qD", olddecl
);
1984 if (!(DECL_TEMPLATE_INSTANTIATION (olddecl
)
1985 && DECL_TEMPLATE_SPECIALIZATION (newdecl
)))
1987 if (DECL_DELETED_FN (newdecl
))
1989 error ("deleted definition of %q+D", newdecl
);
1990 inform (DECL_SOURCE_LOCATION (olddecl
),
1991 "previous declaration of %qD", olddecl
);
1993 DECL_DELETED_FN (newdecl
) |= DECL_DELETED_FN (olddecl
);
1997 /* Deal with C++: must preserve virtual function table size. */
1998 if (TREE_CODE (olddecl
) == TYPE_DECL
)
2000 tree newtype
= TREE_TYPE (newdecl
);
2001 tree oldtype
= TREE_TYPE (olddecl
);
2003 if (newtype
!= error_mark_node
&& oldtype
!= error_mark_node
2004 && TYPE_LANG_SPECIFIC (newtype
) && TYPE_LANG_SPECIFIC (oldtype
))
2005 CLASSTYPE_FRIEND_CLASSES (newtype
)
2006 = CLASSTYPE_FRIEND_CLASSES (oldtype
);
2008 DECL_ORIGINAL_TYPE (newdecl
) = DECL_ORIGINAL_TYPE (olddecl
);
2011 /* Copy all the DECL_... slots specified in the new decl
2012 except for any that we copy here from the old type. */
2013 DECL_ATTRIBUTES (newdecl
)
2014 = (*targetm
.merge_decl_attributes
) (olddecl
, newdecl
);
2016 if (DECL_DECLARES_FUNCTION_P (olddecl
) && DECL_DECLARES_FUNCTION_P (newdecl
))
2018 olddecl_friend
= DECL_FRIEND_P (olddecl
);
2019 hidden_friend
= (DECL_ANTICIPATED (olddecl
)
2020 && DECL_HIDDEN_FRIEND_P (olddecl
)
2021 && newdecl_is_friend
);
2024 DECL_ANTICIPATED (olddecl
) = 0;
2025 DECL_HIDDEN_FRIEND_P (olddecl
) = 0;
2029 if (TREE_CODE (newdecl
) == TEMPLATE_DECL
)
2033 old_result
= DECL_TEMPLATE_RESULT (olddecl
);
2034 new_result
= DECL_TEMPLATE_RESULT (newdecl
);
2035 TREE_TYPE (olddecl
) = TREE_TYPE (old_result
);
2036 DECL_TEMPLATE_SPECIALIZATIONS (olddecl
)
2037 = chainon (DECL_TEMPLATE_SPECIALIZATIONS (olddecl
),
2038 DECL_TEMPLATE_SPECIALIZATIONS (newdecl
));
2040 DECL_ATTRIBUTES (old_result
)
2041 = (*targetm
.merge_decl_attributes
) (old_result
, new_result
);
2043 if (DECL_FUNCTION_TEMPLATE_P (newdecl
))
2045 /* Per C++11 8.3.6/4, default arguments cannot be added in later
2046 declarations of a function template. */
2047 if (DECL_SOURCE_LOCATION (newdecl
)
2048 != DECL_SOURCE_LOCATION (olddecl
))
2049 check_redeclaration_no_default_args (newdecl
);
2051 check_default_args (newdecl
);
2053 if (GNU_INLINE_P (old_result
) != GNU_INLINE_P (new_result
)
2054 && DECL_INITIAL (new_result
))
2056 if (DECL_INITIAL (old_result
))
2057 DECL_UNINLINABLE (old_result
) = 1;
2059 DECL_UNINLINABLE (old_result
) = DECL_UNINLINABLE (new_result
);
2060 DECL_EXTERNAL (old_result
) = DECL_EXTERNAL (new_result
);
2061 DECL_NOT_REALLY_EXTERN (old_result
)
2062 = DECL_NOT_REALLY_EXTERN (new_result
);
2063 DECL_INTERFACE_KNOWN (old_result
)
2064 = DECL_INTERFACE_KNOWN (new_result
);
2065 DECL_DECLARED_INLINE_P (old_result
)
2066 = DECL_DECLARED_INLINE_P (new_result
);
2067 DECL_DISREGARD_INLINE_LIMITS (old_result
)
2068 |= DECL_DISREGARD_INLINE_LIMITS (new_result
);
2073 DECL_DECLARED_INLINE_P (old_result
)
2074 |= DECL_DECLARED_INLINE_P (new_result
);
2075 DECL_DISREGARD_INLINE_LIMITS (old_result
)
2076 |= DECL_DISREGARD_INLINE_LIMITS (new_result
);
2077 check_redeclaration_exception_specification (newdecl
, olddecl
);
2081 /* If the new declaration is a definition, update the file and
2082 line information on the declaration, and also make
2083 the old declaration the same definition. */
2084 if (DECL_INITIAL (new_result
) != NULL_TREE
)
2086 DECL_SOURCE_LOCATION (olddecl
)
2087 = DECL_SOURCE_LOCATION (old_result
)
2088 = DECL_SOURCE_LOCATION (newdecl
);
2089 DECL_INITIAL (old_result
) = DECL_INITIAL (new_result
);
2090 if (DECL_FUNCTION_TEMPLATE_P (newdecl
))
2093 DECL_ARGUMENTS (old_result
)
2094 = DECL_ARGUMENTS (new_result
);
2095 for (parm
= DECL_ARGUMENTS (old_result
); parm
;
2096 parm
= DECL_CHAIN (parm
))
2097 DECL_CONTEXT (parm
) = old_result
;
2106 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2107 check_redeclaration_exception_specification (newdecl
, olddecl
);
2109 /* Automatically handles default parameters. */
2110 tree oldtype
= TREE_TYPE (olddecl
);
2113 /* For typedefs use the old type, as the new type's DECL_NAME points
2114 at newdecl, which will be ggc_freed. */
2115 if (TREE_CODE (newdecl
) == TYPE_DECL
)
2117 /* But NEWTYPE might have an attribute, honor that. */
2118 tree tem
= TREE_TYPE (newdecl
);
2121 if (TYPE_USER_ALIGN (tem
))
2123 if (TYPE_ALIGN (tem
) > TYPE_ALIGN (newtype
))
2124 SET_TYPE_ALIGN (newtype
, TYPE_ALIGN (tem
));
2125 TYPE_USER_ALIGN (newtype
) = true;
2128 /* And remove the new type from the variants list. */
2129 if (TYPE_NAME (TREE_TYPE (newdecl
)) == newdecl
)
2131 tree remove
= TREE_TYPE (newdecl
);
2132 for (tree t
= TYPE_MAIN_VARIANT (remove
); ;
2133 t
= TYPE_NEXT_VARIANT (t
))
2134 if (TYPE_NEXT_VARIANT (t
) == remove
)
2136 TYPE_NEXT_VARIANT (t
) = TYPE_NEXT_VARIANT (remove
);
2142 /* Merge the data types specified in the two decls. */
2143 newtype
= merge_types (TREE_TYPE (newdecl
), TREE_TYPE (olddecl
));
2145 if (VAR_P (newdecl
))
2147 DECL_THIS_EXTERN (newdecl
) |= DECL_THIS_EXTERN (olddecl
);
2148 /* For already initialized vars, TREE_READONLY could have been
2149 cleared in cp_finish_decl, because the var needs runtime
2150 initialization or destruction. Make sure not to set
2151 TREE_READONLY on it again. */
2152 if (DECL_INITIALIZED_P (olddecl
)
2153 && !DECL_EXTERNAL (olddecl
)
2154 && !TREE_READONLY (olddecl
))
2155 TREE_READONLY (newdecl
) = 0;
2156 DECL_INITIALIZED_P (newdecl
) |= DECL_INITIALIZED_P (olddecl
);
2157 DECL_NONTRIVIALLY_INITIALIZED_P (newdecl
)
2158 |= DECL_NONTRIVIALLY_INITIALIZED_P (olddecl
);
2159 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (newdecl
)
2160 |= DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (olddecl
);
2161 if (DECL_CLASS_SCOPE_P (olddecl
))
2162 DECL_DECLARED_CONSTEXPR_P (newdecl
)
2163 |= DECL_DECLARED_CONSTEXPR_P (olddecl
);
2165 /* Merge the threadprivate attribute from OLDDECL into NEWDECL. */
2166 if (DECL_LANG_SPECIFIC (olddecl
)
2167 && CP_DECL_THREADPRIVATE_P (olddecl
))
2169 /* Allocate a LANG_SPECIFIC structure for NEWDECL, if needed. */
2170 if (!DECL_LANG_SPECIFIC (newdecl
))
2171 retrofit_lang_decl (newdecl
);
2173 CP_DECL_THREADPRIVATE_P (newdecl
) = 1;
2177 /* An explicit specialization of a function template or of a member
2178 function of a class template can be declared transaction_safe
2179 independently of whether the corresponding template entity is declared
2180 transaction_safe. */
2181 if (flag_tm
&& TREE_CODE (newdecl
) == FUNCTION_DECL
2182 && DECL_TEMPLATE_INSTANTIATION (olddecl
)
2183 && DECL_TEMPLATE_SPECIALIZATION (newdecl
)
2184 && tx_safe_fn_type_p (newtype
)
2185 && !tx_safe_fn_type_p (TREE_TYPE (newdecl
)))
2186 newtype
= tx_unsafe_fn_variant (newtype
);
2188 TREE_TYPE (newdecl
) = TREE_TYPE (olddecl
) = newtype
;
2190 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2191 check_default_args (newdecl
);
2193 /* Lay the type out, unless already done. */
2194 if (! same_type_p (newtype
, oldtype
)
2195 && TREE_TYPE (newdecl
) != error_mark_node
2196 && !(processing_template_decl
&& uses_template_parms (newdecl
)))
2197 layout_type (TREE_TYPE (newdecl
));
2199 if ((VAR_P (newdecl
)
2200 || TREE_CODE (newdecl
) == PARM_DECL
2201 || TREE_CODE (newdecl
) == RESULT_DECL
2202 || TREE_CODE (newdecl
) == FIELD_DECL
2203 || TREE_CODE (newdecl
) == TYPE_DECL
)
2204 && !(processing_template_decl
&& uses_template_parms (newdecl
)))
2205 layout_decl (newdecl
, 0);
2207 /* Merge the type qualifiers. */
2208 if (TREE_READONLY (newdecl
))
2209 TREE_READONLY (olddecl
) = 1;
2210 if (TREE_THIS_VOLATILE (newdecl
))
2211 TREE_THIS_VOLATILE (olddecl
) = 1;
2212 if (TREE_NOTHROW (newdecl
))
2213 TREE_NOTHROW (olddecl
) = 1;
2215 /* Merge deprecatedness. */
2216 if (TREE_DEPRECATED (newdecl
))
2217 TREE_DEPRECATED (olddecl
) = 1;
2219 /* Preserve function specific target and optimization options */
2220 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2222 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl
)
2223 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl
))
2224 DECL_FUNCTION_SPECIFIC_TARGET (newdecl
)
2225 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl
);
2227 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl
)
2228 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl
))
2229 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl
)
2230 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl
);
2233 /* Merge the initialization information. */
2234 if (DECL_INITIAL (newdecl
) == NULL_TREE
2235 && DECL_INITIAL (olddecl
) != NULL_TREE
)
2237 DECL_INITIAL (newdecl
) = DECL_INITIAL (olddecl
);
2238 DECL_SOURCE_LOCATION (newdecl
) = DECL_SOURCE_LOCATION (olddecl
);
2239 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2241 DECL_SAVED_TREE (newdecl
) = DECL_SAVED_TREE (olddecl
);
2242 DECL_STRUCT_FUNCTION (newdecl
) = DECL_STRUCT_FUNCTION (olddecl
);
2246 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2248 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl
)
2249 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl
);
2250 DECL_NO_LIMIT_STACK (newdecl
) |= DECL_NO_LIMIT_STACK (olddecl
);
2251 TREE_THIS_VOLATILE (newdecl
) |= TREE_THIS_VOLATILE (olddecl
);
2252 TREE_NOTHROW (newdecl
) |= TREE_NOTHROW (olddecl
);
2253 DECL_IS_MALLOC (newdecl
) |= DECL_IS_MALLOC (olddecl
);
2254 DECL_IS_OPERATOR_NEW (newdecl
) |= DECL_IS_OPERATOR_NEW (olddecl
);
2255 DECL_PURE_P (newdecl
) |= DECL_PURE_P (olddecl
);
2256 TREE_READONLY (newdecl
) |= TREE_READONLY (olddecl
);
2257 DECL_LOOPING_CONST_OR_PURE_P (newdecl
)
2258 |= DECL_LOOPING_CONST_OR_PURE_P (olddecl
);
2259 /* Keep the old RTL. */
2260 COPY_DECL_RTL (olddecl
, newdecl
);
2262 else if (VAR_P (newdecl
)
2263 && (DECL_SIZE (olddecl
) || !DECL_SIZE (newdecl
)))
2265 /* Keep the old RTL. We cannot keep the old RTL if the old
2266 declaration was for an incomplete object and the new
2267 declaration is not since many attributes of the RTL will
2269 COPY_DECL_RTL (olddecl
, newdecl
);
2272 /* If cannot merge, then use the new type and qualifiers,
2273 and don't preserve the old rtl. */
2276 /* Clean out any memory we had of the old declaration. */
2277 tree oldstatic
= value_member (olddecl
, static_aggregates
);
2279 TREE_VALUE (oldstatic
) = error_mark_node
;
2281 TREE_TYPE (olddecl
) = TREE_TYPE (newdecl
);
2282 TREE_READONLY (olddecl
) = TREE_READONLY (newdecl
);
2283 TREE_THIS_VOLATILE (olddecl
) = TREE_THIS_VOLATILE (newdecl
);
2284 TREE_NOTHROW (olddecl
) = TREE_NOTHROW (newdecl
);
2285 TREE_SIDE_EFFECTS (olddecl
) = TREE_SIDE_EFFECTS (newdecl
);
2288 /* Merge the storage class information. */
2289 merge_weak (newdecl
, olddecl
);
2291 DECL_DEFER_OUTPUT (newdecl
) |= DECL_DEFER_OUTPUT (olddecl
);
2292 TREE_PUBLIC (newdecl
) = TREE_PUBLIC (olddecl
);
2293 TREE_STATIC (olddecl
) = TREE_STATIC (newdecl
) |= TREE_STATIC (olddecl
);
2294 if (! DECL_EXTERNAL (olddecl
))
2295 DECL_EXTERNAL (newdecl
) = 0;
2296 if (! DECL_COMDAT (olddecl
))
2297 DECL_COMDAT (newdecl
) = 0;
2299 new_template_info
= NULL_TREE
;
2300 if (DECL_LANG_SPECIFIC (newdecl
) && DECL_LANG_SPECIFIC (olddecl
))
2302 bool new_redefines_gnu_inline
= false;
2304 if (new_defines_function
2305 && ((DECL_INTERFACE_KNOWN (olddecl
)
2306 && TREE_CODE (olddecl
) == FUNCTION_DECL
)
2307 || (TREE_CODE (olddecl
) == TEMPLATE_DECL
2308 && (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl
))
2309 == FUNCTION_DECL
))))
2313 if (TREE_CODE (fn
) == TEMPLATE_DECL
)
2314 fn
= DECL_TEMPLATE_RESULT (olddecl
);
2316 new_redefines_gnu_inline
= GNU_INLINE_P (fn
) && DECL_INITIAL (fn
);
2319 if (!new_redefines_gnu_inline
)
2321 DECL_INTERFACE_KNOWN (newdecl
) |= DECL_INTERFACE_KNOWN (olddecl
);
2322 DECL_NOT_REALLY_EXTERN (newdecl
) |= DECL_NOT_REALLY_EXTERN (olddecl
);
2323 DECL_COMDAT (newdecl
) |= DECL_COMDAT (olddecl
);
2325 DECL_TEMPLATE_INSTANTIATED (newdecl
)
2326 |= DECL_TEMPLATE_INSTANTIATED (olddecl
);
2327 DECL_ODR_USED (newdecl
) |= DECL_ODR_USED (olddecl
);
2329 /* If the OLDDECL is an instantiation and/or specialization,
2330 then the NEWDECL must be too. But, it may not yet be marked
2331 as such if the caller has created NEWDECL, but has not yet
2332 figured out that it is a redeclaration. */
2333 if (!DECL_USE_TEMPLATE (newdecl
))
2334 DECL_USE_TEMPLATE (newdecl
) = DECL_USE_TEMPLATE (olddecl
);
2336 /* Don't really know how much of the language-specific
2337 values we should copy from old to new. */
2338 DECL_IN_AGGR_P (newdecl
) = DECL_IN_AGGR_P (olddecl
);
2339 DECL_REPO_AVAILABLE_P (newdecl
) = DECL_REPO_AVAILABLE_P (olddecl
);
2340 DECL_INITIALIZED_IN_CLASS_P (newdecl
)
2341 |= DECL_INITIALIZED_IN_CLASS_P (olddecl
);
2343 if (LANG_DECL_HAS_MIN (newdecl
))
2345 DECL_LANG_SPECIFIC (newdecl
)->u
.min
.u2
=
2346 DECL_LANG_SPECIFIC (olddecl
)->u
.min
.u2
;
2347 if (DECL_TEMPLATE_INFO (newdecl
))
2349 new_template_info
= DECL_TEMPLATE_INFO (newdecl
);
2350 if (DECL_TEMPLATE_INSTANTIATION (olddecl
)
2351 && DECL_TEMPLATE_SPECIALIZATION (newdecl
))
2352 /* Remember the presence of explicit specialization args. */
2353 TINFO_USED_TEMPLATE_ID (DECL_TEMPLATE_INFO (olddecl
))
2354 = TINFO_USED_TEMPLATE_ID (new_template_info
);
2356 DECL_TEMPLATE_INFO (newdecl
) = DECL_TEMPLATE_INFO (olddecl
);
2358 /* Only functions have these fields. */
2359 if (DECL_DECLARES_FUNCTION_P (newdecl
))
2361 DECL_NONCONVERTING_P (newdecl
) = DECL_NONCONVERTING_P (olddecl
);
2362 DECL_BEFRIENDING_CLASSES (newdecl
)
2363 = chainon (DECL_BEFRIENDING_CLASSES (newdecl
),
2364 DECL_BEFRIENDING_CLASSES (olddecl
));
2365 /* DECL_THUNKS is only valid for virtual functions,
2366 otherwise it is a DECL_FRIEND_CONTEXT. */
2367 if (DECL_VIRTUAL_P (newdecl
))
2368 SET_DECL_THUNKS (newdecl
, DECL_THUNKS (olddecl
));
2370 /* Only variables have this field. */
2371 else if (VAR_P (newdecl
)
2372 && VAR_HAD_UNKNOWN_BOUND (olddecl
))
2373 SET_VAR_HAD_UNKNOWN_BOUND (newdecl
);
2376 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2380 /* Merge parameter attributes. */
2381 tree oldarg
, newarg
;
2382 for (oldarg
= DECL_ARGUMENTS(olddecl
),
2383 newarg
= DECL_ARGUMENTS(newdecl
);
2385 oldarg
= DECL_CHAIN(oldarg
), newarg
= DECL_CHAIN(newarg
)) {
2386 DECL_ATTRIBUTES (newarg
)
2387 = (*targetm
.merge_decl_attributes
) (oldarg
, newarg
);
2388 DECL_ATTRIBUTES (oldarg
) = DECL_ATTRIBUTES (newarg
);
2391 if (DECL_TEMPLATE_INSTANTIATION (olddecl
)
2392 && !DECL_TEMPLATE_INSTANTIATION (newdecl
))
2394 /* If newdecl is not a specialization, then it is not a
2395 template-related function at all. And that means that we
2396 should have exited above, returning 0. */
2397 gcc_assert (DECL_TEMPLATE_SPECIALIZATION (newdecl
));
2399 if (DECL_ODR_USED (olddecl
))
2400 /* From [temp.expl.spec]:
2402 If a template, a member template or the member of a class
2403 template is explicitly specialized then that
2404 specialization shall be declared before the first use of
2405 that specialization that would cause an implicit
2406 instantiation to take place, in every translation unit in
2407 which such a use occurs. */
2408 error ("explicit specialization of %qD after first use",
2411 SET_DECL_TEMPLATE_SPECIALIZATION (olddecl
);
2412 DECL_COMDAT (newdecl
) = (TREE_PUBLIC (newdecl
)
2413 && DECL_DECLARED_INLINE_P (newdecl
));
2415 /* Don't propagate visibility from the template to the
2416 specialization here. We'll do that in determine_visibility if
2418 DECL_VISIBILITY_SPECIFIED (olddecl
) = 0;
2420 /* [temp.expl.spec/14] We don't inline explicit specialization
2421 just because the primary template says so. */
2423 /* But still keep DECL_DISREGARD_INLINE_LIMITS in sync with
2424 the always_inline attribute. */
2425 if (DECL_DISREGARD_INLINE_LIMITS (olddecl
)
2426 && !DECL_DISREGARD_INLINE_LIMITS (newdecl
))
2428 if (DECL_DECLARED_INLINE_P (newdecl
))
2429 DECL_DISREGARD_INLINE_LIMITS (newdecl
) = true;
2431 DECL_ATTRIBUTES (newdecl
)
2432 = remove_attribute ("always_inline",
2433 DECL_ATTRIBUTES (newdecl
));
2436 else if (new_defines_function
&& DECL_INITIAL (olddecl
))
2438 /* Never inline re-defined extern inline functions.
2439 FIXME: this could be better handled by keeping both
2440 function as separate declarations. */
2441 DECL_UNINLINABLE (newdecl
) = 1;
2445 if (DECL_PENDING_INLINE_P (olddecl
))
2447 DECL_PENDING_INLINE_P (newdecl
) = 1;
2448 DECL_PENDING_INLINE_INFO (newdecl
)
2449 = DECL_PENDING_INLINE_INFO (olddecl
);
2451 else if (DECL_PENDING_INLINE_P (newdecl
))
2453 else if (DECL_SAVED_FUNCTION_DATA (newdecl
) == NULL
)
2454 DECL_SAVED_FUNCTION_DATA (newdecl
)
2455 = DECL_SAVED_FUNCTION_DATA (olddecl
);
2457 DECL_DECLARED_INLINE_P (newdecl
) |= DECL_DECLARED_INLINE_P (olddecl
);
2459 DECL_UNINLINABLE (newdecl
) = DECL_UNINLINABLE (olddecl
)
2460 = (DECL_UNINLINABLE (newdecl
) || DECL_UNINLINABLE (olddecl
));
2462 DECL_DISREGARD_INLINE_LIMITS (newdecl
)
2463 = DECL_DISREGARD_INLINE_LIMITS (olddecl
)
2464 = (DECL_DISREGARD_INLINE_LIMITS (newdecl
)
2465 || DECL_DISREGARD_INLINE_LIMITS (olddecl
));
2468 /* Preserve abstractness on cloned [cd]tors. */
2469 DECL_ABSTRACT_P (newdecl
) = DECL_ABSTRACT_P (olddecl
);
2471 /* Update newdecl's parms to point at olddecl. */
2472 for (parm
= DECL_ARGUMENTS (newdecl
); parm
;
2473 parm
= DECL_CHAIN (parm
))
2474 DECL_CONTEXT (parm
) = olddecl
;
2478 SET_DECL_LANGUAGE (olddecl
, DECL_LANGUAGE (newdecl
));
2479 COPY_DECL_ASSEMBLER_NAME (newdecl
, olddecl
);
2480 COPY_DECL_RTL (newdecl
, olddecl
);
2482 if (! types_match
|| new_defines_function
)
2484 /* These need to be copied so that the names are available.
2485 Note that if the types do match, we'll preserve inline
2486 info and other bits, but if not, we won't. */
2487 DECL_ARGUMENTS (olddecl
) = DECL_ARGUMENTS (newdecl
);
2488 DECL_RESULT (olddecl
) = DECL_RESULT (newdecl
);
2490 /* If redeclaring a builtin function, it stays built in
2491 if newdecl is a gnu_inline definition, or if newdecl is just
2493 if (DECL_BUILT_IN (olddecl
)
2494 && (new_defines_function
? GNU_INLINE_P (newdecl
) : types_match
))
2496 DECL_BUILT_IN_CLASS (newdecl
) = DECL_BUILT_IN_CLASS (olddecl
);
2497 DECL_FUNCTION_CODE (newdecl
) = DECL_FUNCTION_CODE (olddecl
);
2498 /* If we're keeping the built-in definition, keep the rtl,
2499 regardless of declaration matches. */
2500 COPY_DECL_RTL (olddecl
, newdecl
);
2501 if (DECL_BUILT_IN_CLASS (newdecl
) == BUILT_IN_NORMAL
)
2503 enum built_in_function fncode
= DECL_FUNCTION_CODE (newdecl
);
2506 /* If a compatible prototype of these builtin functions
2507 is seen, assume the runtime implements it with the
2508 expected semantics. */
2509 case BUILT_IN_STPCPY
:
2510 if (builtin_decl_explicit_p (fncode
))
2511 set_builtin_decl_implicit_p (fncode
, true);
2514 if (builtin_decl_explicit_p (fncode
))
2515 set_builtin_decl_declared_p (fncode
, true);
2520 if (new_defines_function
)
2521 /* If defining a function declared with other language
2522 linkage, use the previously declared language linkage. */
2523 SET_DECL_LANGUAGE (newdecl
, DECL_LANGUAGE (olddecl
));
2524 else if (types_match
)
2526 DECL_RESULT (newdecl
) = DECL_RESULT (olddecl
);
2527 /* Don't clear out the arguments if we're just redeclaring a
2529 if (DECL_ARGUMENTS (olddecl
))
2530 DECL_ARGUMENTS (newdecl
) = DECL_ARGUMENTS (olddecl
);
2533 else if (TREE_CODE (newdecl
) == NAMESPACE_DECL
)
2534 NAMESPACE_LEVEL (newdecl
) = NAMESPACE_LEVEL (olddecl
);
2536 /* Now preserve various other info from the definition. */
2537 TREE_ADDRESSABLE (newdecl
) = TREE_ADDRESSABLE (olddecl
);
2538 TREE_ASM_WRITTEN (newdecl
) = TREE_ASM_WRITTEN (olddecl
);
2539 DECL_COMMON (newdecl
) = DECL_COMMON (olddecl
);
2540 COPY_DECL_ASSEMBLER_NAME (olddecl
, newdecl
);
2542 /* Warn about conflicting visibility specifications. */
2543 if (DECL_VISIBILITY_SPECIFIED (olddecl
)
2544 && DECL_VISIBILITY_SPECIFIED (newdecl
)
2545 && DECL_VISIBILITY (newdecl
) != DECL_VISIBILITY (olddecl
))
2547 if (warning_at (DECL_SOURCE_LOCATION (newdecl
), OPT_Wattributes
,
2548 "%qD: visibility attribute ignored because it "
2549 "conflicts with previous declaration", newdecl
))
2550 inform (DECL_SOURCE_LOCATION (olddecl
),
2551 "previous declaration of %qD", olddecl
);
2553 /* Choose the declaration which specified visibility. */
2554 if (DECL_VISIBILITY_SPECIFIED (olddecl
))
2556 DECL_VISIBILITY (newdecl
) = DECL_VISIBILITY (olddecl
);
2557 DECL_VISIBILITY_SPECIFIED (newdecl
) = 1;
2559 /* Init priority used to be merged from newdecl to olddecl by the memcpy,
2560 so keep this behavior. */
2561 if (VAR_P (newdecl
) && DECL_HAS_INIT_PRIORITY_P (newdecl
))
2563 SET_DECL_INIT_PRIORITY (olddecl
, DECL_INIT_PRIORITY (newdecl
));
2564 DECL_HAS_INIT_PRIORITY_P (olddecl
) = 1;
2566 /* Likewise for DECL_ALIGN, DECL_USER_ALIGN and DECL_PACKED. */
2567 if (DECL_ALIGN (olddecl
) > DECL_ALIGN (newdecl
))
2569 SET_DECL_ALIGN (newdecl
, DECL_ALIGN (olddecl
));
2570 DECL_USER_ALIGN (newdecl
) |= DECL_USER_ALIGN (olddecl
);
2572 DECL_USER_ALIGN (olddecl
) = DECL_USER_ALIGN (newdecl
);
2573 if (TREE_CODE (newdecl
) == FIELD_DECL
)
2574 DECL_PACKED (olddecl
) = DECL_PACKED (newdecl
);
2576 /* The DECL_LANG_SPECIFIC information in OLDDECL will be replaced
2577 with that from NEWDECL below. */
2578 if (DECL_LANG_SPECIFIC (olddecl
))
2580 gcc_assert (DECL_LANG_SPECIFIC (olddecl
)
2581 != DECL_LANG_SPECIFIC (newdecl
));
2582 ggc_free (DECL_LANG_SPECIFIC (olddecl
));
2585 /* Merge the USED information. */
2586 if (TREE_USED (olddecl
))
2587 TREE_USED (newdecl
) = 1;
2588 else if (TREE_USED (newdecl
))
2589 TREE_USED (olddecl
) = 1;
2590 if (VAR_P (newdecl
))
2592 if (DECL_READ_P (olddecl
))
2593 DECL_READ_P (newdecl
) = 1;
2594 else if (DECL_READ_P (newdecl
))
2595 DECL_READ_P (olddecl
) = 1;
2597 if (DECL_PRESERVE_P (olddecl
))
2598 DECL_PRESERVE_P (newdecl
) = 1;
2599 else if (DECL_PRESERVE_P (newdecl
))
2600 DECL_PRESERVE_P (olddecl
) = 1;
2602 /* Merge the DECL_FUNCTION_VERSIONED information. newdecl will be copied
2603 to olddecl and deleted. */
2604 if (TREE_CODE (newdecl
) == FUNCTION_DECL
2605 && DECL_FUNCTION_VERSIONED (olddecl
))
2607 /* Set the flag for newdecl so that it gets copied to olddecl. */
2608 DECL_FUNCTION_VERSIONED (newdecl
) = 1;
2609 /* newdecl will be purged after copying to olddecl and is no longer
2611 cgraph_node::delete_function_version (newdecl
);
2614 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2617 struct symtab_node
*snode
= symtab_node::get (olddecl
);
2619 function_size
= sizeof (struct tree_decl_common
);
2621 memcpy ((char *) olddecl
+ sizeof (struct tree_common
),
2622 (char *) newdecl
+ sizeof (struct tree_common
),
2623 function_size
- sizeof (struct tree_common
));
2625 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
2626 (char *) newdecl
+ sizeof (struct tree_decl_common
),
2627 sizeof (struct tree_function_decl
) - sizeof (struct tree_decl_common
));
2629 /* Preserve symtab node mapping. */
2630 olddecl
->decl_with_vis
.symtab_node
= snode
;
2632 if (new_template_info
)
2633 /* If newdecl is a template instantiation, it is possible that
2634 the following sequence of events has occurred:
2636 o A friend function was declared in a class template. The
2637 class template was instantiated.
2639 o The instantiation of the friend declaration was
2640 recorded on the instantiation list, and is newdecl.
2642 o Later, however, instantiate_class_template called pushdecl
2643 on the newdecl to perform name injection. But, pushdecl in
2644 turn called duplicate_decls when it discovered that another
2645 declaration of a global function with the same name already
2648 o Here, in duplicate_decls, we decided to clobber newdecl.
2650 If we're going to do that, we'd better make sure that
2651 olddecl, and not newdecl, is on the list of
2652 instantiations so that if we try to do the instantiation
2653 again we won't get the clobbered declaration. */
2654 reregister_specialization (newdecl
,
2660 size_t size
= tree_code_size (TREE_CODE (newdecl
));
2662 memcpy ((char *) olddecl
+ sizeof (struct tree_common
),
2663 (char *) newdecl
+ sizeof (struct tree_common
),
2664 sizeof (struct tree_decl_common
) - sizeof (struct tree_common
));
2665 switch (TREE_CODE (newdecl
))
2675 struct symtab_node
*snode
= NULL
;
2678 && (TREE_STATIC (olddecl
) || TREE_PUBLIC (olddecl
)
2679 || DECL_EXTERNAL (olddecl
)))
2680 snode
= symtab_node::get (olddecl
);
2681 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
2682 (char *) newdecl
+ sizeof (struct tree_decl_common
),
2683 size
- sizeof (struct tree_decl_common
)
2684 + TREE_CODE_LENGTH (TREE_CODE (newdecl
)) * sizeof (char *));
2685 if (VAR_P (newdecl
))
2686 olddecl
->decl_with_vis
.symtab_node
= snode
;
2690 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
2691 (char *) newdecl
+ sizeof (struct tree_decl_common
),
2692 sizeof (struct tree_decl_non_common
) - sizeof (struct tree_decl_common
)
2693 + TREE_CODE_LENGTH (TREE_CODE (newdecl
)) * sizeof (char *));
2698 if (VAR_OR_FUNCTION_DECL_P (newdecl
))
2700 if (DECL_EXTERNAL (olddecl
)
2701 || TREE_PUBLIC (olddecl
)
2702 || TREE_STATIC (olddecl
))
2704 /* Merge the section attribute.
2705 We want to issue an error if the sections conflict but that must be
2706 done later in decl_attributes since we are called before attributes
2708 if (DECL_SECTION_NAME (newdecl
) != NULL
)
2709 set_decl_section_name (olddecl
, DECL_SECTION_NAME (newdecl
));
2711 if (DECL_ONE_ONLY (newdecl
))
2713 struct symtab_node
*oldsym
, *newsym
;
2714 if (TREE_CODE (olddecl
) == FUNCTION_DECL
)
2715 oldsym
= cgraph_node::get_create (olddecl
);
2717 oldsym
= varpool_node::get_create (olddecl
);
2718 newsym
= symtab_node::get (newdecl
);
2719 oldsym
->set_comdat_group (newsym
->get_comdat_group ());
2724 && CP_DECL_THREAD_LOCAL_P (newdecl
))
2726 CP_DECL_THREAD_LOCAL_P (olddecl
) = true;
2727 if (!processing_template_decl
)
2728 set_decl_tls_model (olddecl
, DECL_TLS_MODEL (newdecl
));
2732 DECL_UID (olddecl
) = olddecl_uid
;
2734 DECL_FRIEND_P (olddecl
) = 1;
2737 DECL_ANTICIPATED (olddecl
) = 1;
2738 DECL_HIDDEN_FRIEND_P (olddecl
) = 1;
2741 /* NEWDECL contains the merged attribute lists.
2742 Update OLDDECL to be the same. */
2743 DECL_ATTRIBUTES (olddecl
) = DECL_ATTRIBUTES (newdecl
);
2745 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2746 so that encode_section_info has a chance to look at the new decl
2747 flags and attributes. */
2748 if (DECL_RTL_SET_P (olddecl
)
2749 && (TREE_CODE (olddecl
) == FUNCTION_DECL
2751 && TREE_STATIC (olddecl
))))
2752 make_decl_rtl (olddecl
);
2754 /* The NEWDECL will no longer be needed. Because every out-of-class
2755 declaration of a member results in a call to duplicate_decls,
2756 freeing these nodes represents in a significant savings.
2758 Before releasing the node, be sore to remove function from symbol
2759 table that might have been inserted there to record comdat group.
2760 Be sure to however do not free DECL_STRUCT_FUNCTION because this
2761 structure is shared in between newdecl and oldecl. */
2762 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2763 DECL_STRUCT_FUNCTION (newdecl
) = NULL
;
2764 if (VAR_OR_FUNCTION_DECL_P (newdecl
))
2766 struct symtab_node
*snode
= symtab_node::get (newdecl
);
2771 /* Remove the associated constraints for newdecl, if any, before
2772 reclaiming memory. */
2774 remove_constraints (newdecl
);
2781 /* Return zero if the declaration NEWDECL is valid
2782 when the declaration OLDDECL (assumed to be for the same name)
2783 has already been seen.
2784 Otherwise return an error message format string with a %s
2785 where the identifier should go. */
2788 redeclaration_error_message (tree newdecl
, tree olddecl
)
2790 if (TREE_CODE (newdecl
) == TYPE_DECL
)
2792 /* Because C++ can put things into name space for free,
2793 constructs like "typedef struct foo { ... } foo"
2794 would look like an erroneous redeclaration. */
2795 if (same_type_p (TREE_TYPE (newdecl
), TREE_TYPE (olddecl
)))
2798 return G_("redefinition of %q#D");
2800 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2802 /* If this is a pure function, its olddecl will actually be
2803 the original initialization to `0' (which we force to call
2804 abort()). Don't complain about redefinition in this case. */
2805 if (DECL_LANG_SPECIFIC (olddecl
) && DECL_PURE_VIRTUAL_P (olddecl
)
2806 && DECL_INITIAL (olddecl
) == NULL_TREE
)
2809 /* If both functions come from different namespaces, this is not
2810 a redeclaration - this is a conflict with a used function. */
2811 if (DECL_NAMESPACE_SCOPE_P (olddecl
)
2812 && DECL_CONTEXT (olddecl
) != DECL_CONTEXT (newdecl
)
2813 && ! decls_match (olddecl
, newdecl
))
2814 return G_("%qD conflicts with used function");
2816 /* We'll complain about linkage mismatches in
2817 warn_extern_redeclared_static. */
2819 /* Defining the same name twice is no good. */
2820 if (decl_defined_p (olddecl
)
2821 && decl_defined_p (newdecl
))
2823 if (DECL_NAME (olddecl
) == NULL_TREE
)
2824 return G_("%q#D not declared in class");
2825 else if (!GNU_INLINE_P (olddecl
)
2826 || GNU_INLINE_P (newdecl
))
2827 return G_("redefinition of %q#D");
2830 if (DECL_DECLARED_INLINE_P (olddecl
) && DECL_DECLARED_INLINE_P (newdecl
))
2832 bool olda
= GNU_INLINE_P (olddecl
);
2833 bool newa
= GNU_INLINE_P (newdecl
);
2838 return G_("%q+D redeclared inline with "
2839 "%<gnu_inline%> attribute");
2841 return G_("%q+D redeclared inline without "
2842 "%<gnu_inline%> attribute");
2846 check_abi_tag_redeclaration
2847 (olddecl
, lookup_attribute ("abi_tag", DECL_ATTRIBUTES (olddecl
)),
2848 lookup_attribute ("abi_tag", DECL_ATTRIBUTES (newdecl
)));
2852 else if (TREE_CODE (newdecl
) == TEMPLATE_DECL
)
2856 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl
)) == TYPE_DECL
)
2858 if (COMPLETE_TYPE_P (TREE_TYPE (newdecl
))
2859 && COMPLETE_TYPE_P (TREE_TYPE (olddecl
)))
2860 return G_("redefinition of %q#D");
2864 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl
)) != FUNCTION_DECL
2865 || (DECL_TEMPLATE_RESULT (newdecl
)
2866 == DECL_TEMPLATE_RESULT (olddecl
)))
2869 nt
= DECL_TEMPLATE_RESULT (newdecl
);
2870 if (DECL_TEMPLATE_INFO (nt
))
2871 nt
= DECL_TEMPLATE_RESULT (template_for_substitution (nt
));
2872 ot
= DECL_TEMPLATE_RESULT (olddecl
);
2873 if (DECL_TEMPLATE_INFO (ot
))
2874 ot
= DECL_TEMPLATE_RESULT (template_for_substitution (ot
));
2875 if (DECL_INITIAL (nt
) && DECL_INITIAL (ot
)
2876 && (!GNU_INLINE_P (ot
) || GNU_INLINE_P (nt
)))
2877 return G_("redefinition of %q#D");
2879 if (DECL_DECLARED_INLINE_P (ot
) && DECL_DECLARED_INLINE_P (nt
))
2881 bool olda
= GNU_INLINE_P (ot
);
2882 bool newa
= GNU_INLINE_P (nt
);
2887 return G_("%q+D redeclared inline with "
2888 "%<gnu_inline%> attribute");
2890 return G_("%q+D redeclared inline without "
2891 "%<gnu_inline%> attribute");
2895 /* Core issue #226 (C++0x):
2897 If a friend function template declaration specifies a
2898 default template-argument, that declaration shall be a
2899 definition and shall be the only declaration of the
2900 function template in the translation unit. */
2901 if ((cxx_dialect
!= cxx98
)
2902 && TREE_CODE (ot
) == FUNCTION_DECL
&& DECL_FRIEND_P (ot
)
2903 && !check_default_tmpl_args (nt
, DECL_TEMPLATE_PARMS (newdecl
),
2904 /*is_primary=*/true,
2905 /*is_partial=*/false,
2906 /*is_friend_decl=*/2))
2907 return G_("redeclaration of friend %q#D "
2908 "may not have default template arguments");
2912 else if (VAR_P (newdecl
)
2913 && CP_DECL_THREAD_LOCAL_P (newdecl
) != CP_DECL_THREAD_LOCAL_P (olddecl
)
2914 && (! DECL_LANG_SPECIFIC (olddecl
)
2915 || ! CP_DECL_THREADPRIVATE_P (olddecl
)
2916 || CP_DECL_THREAD_LOCAL_P (newdecl
)))
2918 /* Only variables can be thread-local, and all declarations must
2919 agree on this property. */
2920 if (CP_DECL_THREAD_LOCAL_P (newdecl
))
2921 return G_("thread-local declaration of %q#D follows "
2922 "non-thread-local declaration");
2924 return G_("non-thread-local declaration of %q#D follows "
2925 "thread-local declaration");
2927 else if (toplevel_bindings_p () || DECL_NAMESPACE_SCOPE_P (newdecl
))
2929 /* The objects have been declared at namespace scope. If either
2930 is a member of an anonymous union, then this is an invalid
2931 redeclaration. For example:
2937 if ((VAR_P (newdecl
) && DECL_ANON_UNION_VAR_P (newdecl
))
2938 || (VAR_P (olddecl
) && DECL_ANON_UNION_VAR_P (olddecl
)))
2939 return G_("redeclaration of %q#D");
2940 /* If at least one declaration is a reference, there is no
2941 conflict. For example:
2947 if (DECL_EXTERNAL (newdecl
) || DECL_EXTERNAL (olddecl
))
2950 /* Static data member declared outside a class definition
2951 if the variable is defined within the class with constexpr
2952 specifier is declaration rather than definition (and
2954 if (cxx_dialect
>= cxx1z
2955 && DECL_CLASS_SCOPE_P (olddecl
)
2956 && DECL_DECLARED_CONSTEXPR_P (olddecl
)
2957 && !DECL_INITIAL (newdecl
))
2959 DECL_EXTERNAL (newdecl
) = 1;
2960 /* For now, only warn with explicit -Wdeprecated. */
2961 if (global_options_set
.x_warn_deprecated
2962 && warning_at (DECL_SOURCE_LOCATION (newdecl
), OPT_Wdeprecated
,
2963 "redundant redeclaration of %<constexpr%> static "
2964 "data member %qD", newdecl
))
2965 inform (DECL_SOURCE_LOCATION (olddecl
),
2966 "previous declaration of %qD", olddecl
);
2970 /* Reject two definitions. */
2971 return G_("redefinition of %q#D");
2975 /* Objects declared with block scope: */
2976 /* Reject two definitions, and reject a definition
2977 together with an external reference. */
2978 if (!(DECL_EXTERNAL (newdecl
) && DECL_EXTERNAL (olddecl
)))
2979 return G_("redeclaration of %q#D");
2984 /* Hash and equality functions for the named_label table. */
2987 named_label_hasher::hash (named_label_entry
*ent
)
2989 return DECL_UID (ent
->label_decl
);
2993 named_label_hasher::equal (named_label_entry
*a
, named_label_entry
*b
)
2995 return a
->label_decl
== b
->label_decl
;
2998 /* Create a new label, named ID. */
3001 make_label_decl (tree id
, int local_p
)
3003 struct named_label_entry
*ent
;
3006 decl
= build_decl (input_location
, LABEL_DECL
, id
, void_type_node
);
3008 DECL_CONTEXT (decl
) = current_function_decl
;
3009 SET_DECL_MODE (decl
, VOIDmode
);
3010 C_DECLARED_LABEL_FLAG (decl
) = local_p
;
3012 /* Say where one reference is to the label, for the sake of the
3013 error if it is not defined. */
3014 DECL_SOURCE_LOCATION (decl
) = input_location
;
3016 /* Record the fact that this identifier is bound to this label. */
3017 SET_IDENTIFIER_LABEL_VALUE (id
, decl
);
3019 /* Create the label htab for the function on demand. */
3021 named_labels
= hash_table
<named_label_hasher
>::create_ggc (13);
3023 /* Record this label on the list of labels used in this function.
3024 We do this before calling make_label_decl so that we get the
3025 IDENTIFIER_LABEL_VALUE before the new label is declared. */
3026 ent
= ggc_cleared_alloc
<named_label_entry
> ();
3027 ent
->label_decl
= decl
;
3029 named_label_entry
**slot
= named_labels
->find_slot (ent
, INSERT
);
3030 gcc_assert (*slot
== NULL
);
3036 /* Look for a label named ID in the current function. If one cannot
3037 be found, create one. (We keep track of used, but undefined,
3038 labels, and complain about them at the end of a function.) */
3041 lookup_label_1 (tree id
)
3045 /* You can't use labels at global scope. */
3046 if (current_function_decl
== NULL_TREE
)
3048 error ("label %qE referenced outside of any function", id
);
3052 /* See if we've already got this label. */
3053 decl
= IDENTIFIER_LABEL_VALUE (id
);
3054 if (decl
!= NULL_TREE
&& DECL_CONTEXT (decl
) == current_function_decl
)
3057 decl
= make_label_decl (id
, /*local_p=*/0);
3061 /* Wrapper for lookup_label_1. */
3064 lookup_label (tree id
)
3067 bool subtime
= timevar_cond_start (TV_NAME_LOOKUP
);
3068 ret
= lookup_label_1 (id
);
3069 timevar_cond_stop (TV_NAME_LOOKUP
, subtime
);
3073 /* Declare a local label named ID. */
3076 declare_local_label (tree id
)
3079 cp_label_binding bind
;
3081 /* Add a new entry to the SHADOWED_LABELS list so that when we leave
3082 this scope we can restore the old value of IDENTIFIER_TYPE_VALUE. */
3083 bind
.prev_value
= IDENTIFIER_LABEL_VALUE (id
);
3085 decl
= make_label_decl (id
, /*local_p=*/1);
3087 vec_safe_push (current_binding_level
->shadowed_labels
, bind
);
3092 /* Returns nonzero if it is ill-formed to jump past the declaration of
3093 DECL. Returns 2 if it's also a real problem. */
3096 decl_jump_unsafe (tree decl
)
3098 /* [stmt.dcl]/3: A program that jumps from a point where a local variable
3099 with automatic storage duration is not in scope to a point where it is
3100 in scope is ill-formed unless the variable has scalar type, class type
3101 with a trivial default constructor and a trivial destructor, a
3102 cv-qualified version of one of these types, or an array of one of the
3103 preceding types and is declared without an initializer (8.5). */
3104 tree type
= TREE_TYPE (decl
);
3106 if (!VAR_P (decl
) || TREE_STATIC (decl
)
3107 || type
== error_mark_node
)
3110 if (DECL_NONTRIVIALLY_INITIALIZED_P (decl
)
3111 || variably_modified_type_p (type
, NULL_TREE
))
3114 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type
))
3120 /* A subroutine of check_previous_goto_1 and check_goto to identify a branch
3124 identify_goto (tree decl
, location_t loc
, const location_t
*locus
,
3125 diagnostic_t diag_kind
)
3128 = (decl
? emit_diagnostic (diag_kind
, loc
, 0, "jump to label %qD", decl
)
3129 : emit_diagnostic (diag_kind
, loc
, 0, "jump to case label"));
3130 if (complained
&& locus
)
3131 inform (*locus
, " from here");
3135 /* Check that a single previously seen jump to a newly defined label
3136 is OK. DECL is the LABEL_DECL or 0; LEVEL is the binding_level for
3137 the jump context; NAMES are the names in scope in LEVEL at the jump
3138 context; LOCUS is the source position of the jump or 0. Returns
3139 true if all is well. */
3142 check_previous_goto_1 (tree decl
, cp_binding_level
* level
, tree names
,
3143 bool exited_omp
, const location_t
*locus
)
3145 cp_binding_level
*b
;
3146 bool complained
= false;
3148 bool saw_eh
= false, saw_omp
= false, saw_tm
= false, saw_cxif
= false;
3152 complained
= identify_goto (decl
, input_location
, locus
, DK_ERROR
);
3154 inform (input_location
, " exits OpenMP structured block");
3159 for (b
= current_binding_level
; b
; b
= b
->level_chain
)
3161 tree new_decls
, old_decls
= (b
== level
? names
: NULL_TREE
);
3163 for (new_decls
= b
->names
; new_decls
!= old_decls
;
3164 new_decls
= (DECL_P (new_decls
) ? DECL_CHAIN (new_decls
)
3165 : TREE_CHAIN (new_decls
)))
3167 int problem
= decl_jump_unsafe (new_decls
);
3173 complained
= identify_goto (decl
, input_location
, locus
,
3180 inform (DECL_SOURCE_LOCATION (new_decls
),
3181 " crosses initialization of %q#D", new_decls
);
3183 inform (DECL_SOURCE_LOCATION (new_decls
),
3184 " enters scope of %q#D which has "
3185 "non-trivial destructor", new_decls
);
3191 if ((b
->kind
== sk_try
|| b
->kind
== sk_catch
) && !saw_eh
)
3195 complained
= identify_goto (decl
, input_location
, locus
,
3201 if (b
->kind
== sk_try
)
3202 inform (input_location
, " enters try block");
3204 inform (input_location
, " enters catch block");
3208 if (b
->kind
== sk_omp
&& !saw_omp
)
3212 complained
= identify_goto (decl
, input_location
, locus
,
3217 inform (input_location
, " enters OpenMP structured block");
3220 if (b
->kind
== sk_transaction
&& !saw_tm
)
3224 complained
= identify_goto (decl
, input_location
, locus
,
3229 inform (input_location
,
3230 " enters synchronized or atomic statement");
3233 if (!saw_cxif
&& b
->kind
== sk_block
3234 && level_for_constexpr_if (b
->level_chain
))
3238 complained
= identify_goto (decl
, input_location
, locus
,
3243 inform (EXPR_LOCATION (b
->level_chain
->this_entity
),
3244 " enters constexpr if statement");
3253 check_previous_goto (tree decl
, struct named_label_use_entry
*use
)
3255 check_previous_goto_1 (decl
, use
->binding_level
,
3256 use
->names_in_scope
, use
->in_omp_scope
,
3257 &use
->o_goto_locus
);
3261 check_switch_goto (cp_binding_level
* level
)
3263 return check_previous_goto_1 (NULL_TREE
, level
, level
->names
, false, NULL
);
3266 /* Check that a new jump to a label DECL is OK. Called by
3267 finish_goto_stmt. */
3270 check_goto (tree decl
)
3272 struct named_label_entry
*ent
, dummy
;
3273 bool saw_catch
= false, complained
= false;
3278 /* We can't know where a computed goto is jumping.
3279 So we assume that it's OK. */
3280 if (TREE_CODE (decl
) != LABEL_DECL
)
3283 /* We didn't record any information about this label when we created it,
3284 and there's not much point since it's trivial to analyze as a return. */
3285 if (decl
== cdtor_label
)
3288 dummy
.label_decl
= decl
;
3289 ent
= named_labels
->find (&dummy
);
3290 gcc_assert (ent
!= NULL
);
3292 /* If the label hasn't been defined yet, defer checking. */
3293 if (! DECL_INITIAL (decl
))
3295 struct named_label_use_entry
*new_use
;
3297 /* Don't bother creating another use if the last goto had the
3298 same data, and will therefore create the same set of errors. */
3300 && ent
->uses
->names_in_scope
== current_binding_level
->names
)
3303 new_use
= ggc_alloc
<named_label_use_entry
> ();
3304 new_use
->binding_level
= current_binding_level
;
3305 new_use
->names_in_scope
= current_binding_level
->names
;
3306 new_use
->o_goto_locus
= input_location
;
3307 new_use
->in_omp_scope
= false;
3309 new_use
->next
= ent
->uses
;
3310 ent
->uses
= new_use
;
3314 if (ent
->in_try_scope
|| ent
->in_catch_scope
|| ent
->in_transaction_scope
3315 || ent
->in_constexpr_if
3316 || ent
->in_omp_scope
|| !vec_safe_is_empty (ent
->bad_decls
))
3318 diagnostic_t diag_kind
= DK_PERMERROR
;
3319 if (ent
->in_try_scope
|| ent
->in_catch_scope
|| ent
->in_constexpr_if
3320 || ent
->in_transaction_scope
|| ent
->in_omp_scope
)
3321 diag_kind
= DK_ERROR
;
3322 complained
= identify_goto (decl
, DECL_SOURCE_LOCATION (decl
),
3323 &input_location
, diag_kind
);
3324 identified
= 1 + (diag_kind
== DK_ERROR
);
3327 FOR_EACH_VEC_SAFE_ELT (ent
->bad_decls
, ix
, bad
)
3329 int u
= decl_jump_unsafe (bad
);
3331 if (u
> 1 && DECL_ARTIFICIAL (bad
))
3333 /* Can't skip init of __exception_info. */
3334 if (identified
== 1)
3336 complained
= identify_goto (decl
, DECL_SOURCE_LOCATION (decl
),
3337 &input_location
, DK_ERROR
);
3341 inform (DECL_SOURCE_LOCATION (bad
), " enters catch block");
3344 else if (complained
)
3347 inform (DECL_SOURCE_LOCATION (bad
),
3348 " skips initialization of %q#D", bad
);
3350 inform (DECL_SOURCE_LOCATION (bad
),
3351 " enters scope of %q#D which has "
3352 "non-trivial destructor", bad
);
3358 if (ent
->in_try_scope
)
3359 inform (input_location
, " enters try block");
3360 else if (ent
->in_catch_scope
&& !saw_catch
)
3361 inform (input_location
, " enters catch block");
3362 else if (ent
->in_transaction_scope
)
3363 inform (input_location
, " enters synchronized or atomic statement");
3364 else if (ent
->in_constexpr_if
)
3365 inform (input_location
, " enters constexpr if statement");
3368 if (ent
->in_omp_scope
)
3371 inform (input_location
, " enters OpenMP structured block");
3373 else if (flag_openmp
)
3375 cp_binding_level
*b
;
3376 for (b
= current_binding_level
; b
; b
= b
->level_chain
)
3378 if (b
== ent
->binding_level
)
3380 if (b
->kind
== sk_omp
)
3384 complained
= identify_goto (decl
,
3385 DECL_SOURCE_LOCATION (decl
),
3386 &input_location
, DK_ERROR
);
3390 inform (input_location
, " exits OpenMP structured block");
3397 /* Check that a return is ok wrt OpenMP structured blocks.
3398 Called by finish_return_stmt. Returns true if all is well. */
3401 check_omp_return (void)
3403 cp_binding_level
*b
;
3404 for (b
= current_binding_level
; b
; b
= b
->level_chain
)
3405 if (b
->kind
== sk_omp
)
3407 error ("invalid exit from OpenMP structured block");
3410 else if (b
->kind
== sk_function_parms
)
3415 /* Define a label, specifying the location in the source file.
3416 Return the LABEL_DECL node for the label. */
3419 define_label_1 (location_t location
, tree name
)
3421 struct named_label_entry
*ent
, dummy
;
3422 cp_binding_level
*p
;
3425 decl
= lookup_label (name
);
3427 dummy
.label_decl
= decl
;
3428 ent
= named_labels
->find (&dummy
);
3429 gcc_assert (ent
!= NULL
);
3431 /* After labels, make any new cleanups in the function go into their
3432 own new (temporary) binding contour. */
3433 for (p
= current_binding_level
;
3434 p
->kind
!= sk_function_parms
;
3436 p
->more_cleanups_ok
= 0;
3438 if (name
== get_identifier ("wchar_t"))
3439 permerror (input_location
, "label named wchar_t");
3441 if (DECL_INITIAL (decl
) != NULL_TREE
)
3443 error ("duplicate label %qD", decl
);
3444 return error_mark_node
;
3448 struct named_label_use_entry
*use
;
3450 /* Mark label as having been defined. */
3451 DECL_INITIAL (decl
) = error_mark_node
;
3452 /* Say where in the source. */
3453 DECL_SOURCE_LOCATION (decl
) = location
;
3455 ent
->binding_level
= current_binding_level
;
3456 ent
->names_in_scope
= current_binding_level
->names
;
3458 for (use
= ent
->uses
; use
; use
= use
->next
)
3459 check_previous_goto (decl
, use
);
3466 /* Wrapper for define_label_1. */
3469 define_label (location_t location
, tree name
)
3472 bool running
= timevar_cond_start (TV_NAME_LOOKUP
);
3473 ret
= define_label_1 (location
, name
);
3474 timevar_cond_stop (TV_NAME_LOOKUP
, running
);
3481 cp_binding_level
*level
;
3482 struct cp_switch
*next
;
3483 /* The SWITCH_STMT being built. */
3485 /* A splay-tree mapping the low element of a case range to the high
3486 element, or NULL_TREE if there is no high element. Used to
3487 determine whether or not a new case label duplicates an old case
3488 label. We need a tree, rather than simply a hash table, because
3489 of the GNU case range extension. */
3491 /* Remember whether there was a case value that is outside the
3492 range of the original type of the controlling expression. */
3493 bool outside_range_p
;
3496 /* A stack of the currently active switch statements. The innermost
3497 switch statement is on the top of the stack. There is no need to
3498 mark the stack for garbage collection because it is only active
3499 during the processing of the body of a function, and we never
3500 collect at that point. */
3502 static struct cp_switch
*switch_stack
;
3504 /* Called right after a switch-statement condition is parsed.
3505 SWITCH_STMT is the switch statement being parsed. */
3508 push_switch (tree switch_stmt
)
3510 struct cp_switch
*p
= XNEW (struct cp_switch
);
3511 p
->level
= current_binding_level
;
3512 p
->next
= switch_stack
;
3513 p
->switch_stmt
= switch_stmt
;
3514 p
->cases
= splay_tree_new (case_compare
, NULL
, NULL
);
3515 p
->outside_range_p
= false;
3522 struct cp_switch
*cs
= switch_stack
;
3523 location_t switch_location
;
3525 /* Emit warnings as needed. */
3526 switch_location
= EXPR_LOC_OR_LOC (cs
->switch_stmt
, input_location
);
3527 const bool bool_cond_p
3528 = (SWITCH_STMT_TYPE (cs
->switch_stmt
)
3529 && TREE_CODE (SWITCH_STMT_TYPE (cs
->switch_stmt
)) == BOOLEAN_TYPE
);
3530 if (!processing_template_decl
)
3531 c_do_switch_warnings (cs
->cases
, switch_location
,
3532 SWITCH_STMT_TYPE (cs
->switch_stmt
),
3533 SWITCH_STMT_COND (cs
->switch_stmt
),
3534 bool_cond_p
, cs
->outside_range_p
);
3536 splay_tree_delete (cs
->cases
);
3537 switch_stack
= switch_stack
->next
;
3541 /* Convert a case constant VALUE in a switch to the type TYPE of the switch
3542 condition. Note that if TYPE and VALUE are already integral we don't
3543 really do the conversion because the language-independent
3544 warning/optimization code will work better that way. */
3547 case_conversion (tree type
, tree value
)
3549 if (value
== NULL_TREE
)
3552 if (cxx_dialect
>= cxx11
3553 && (SCOPED_ENUM_P (type
)
3554 || !INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (value
))))
3556 if (INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type
))
3557 type
= type_promotes_to (type
);
3558 value
= (perform_implicit_conversion_flags
3559 (type
, value
, tf_warning_or_error
,
3560 LOOKUP_IMPLICIT
| LOOKUP_NO_NON_INTEGRAL
));
3562 return cxx_constant_value (value
);
3565 /* Note that we've seen a definition of a case label, and complain if this
3566 is a bad place for one. */
3569 finish_case_label (location_t loc
, tree low_value
, tree high_value
)
3572 cp_binding_level
*p
;
3575 if (processing_template_decl
)
3579 /* For templates, just add the case label; we'll do semantic
3580 analysis at instantiation-time. */
3581 label
= build_decl (loc
, LABEL_DECL
, NULL_TREE
, NULL_TREE
);
3582 return add_stmt (build_case_label (low_value
, high_value
, label
));
3585 /* Find the condition on which this switch statement depends. */
3586 cond
= SWITCH_STMT_COND (switch_stack
->switch_stmt
);
3587 if (cond
&& TREE_CODE (cond
) == TREE_LIST
)
3588 cond
= TREE_VALUE (cond
);
3590 if (!check_switch_goto (switch_stack
->level
))
3591 return error_mark_node
;
3593 type
= SWITCH_STMT_TYPE (switch_stack
->switch_stmt
);
3595 low_value
= case_conversion (type
, low_value
);
3596 high_value
= case_conversion (type
, high_value
);
3598 r
= c_add_case_label (loc
, switch_stack
->cases
, cond
, type
,
3599 low_value
, high_value
,
3600 &switch_stack
->outside_range_p
);
3602 /* After labels, make any new cleanups in the function go into their
3603 own new (temporary) binding contour. */
3604 for (p
= current_binding_level
;
3605 p
->kind
!= sk_function_parms
;
3607 p
->more_cleanups_ok
= 0;
3612 struct typename_info
{
3620 struct typename_hasher
: ggc_ptr_hash
<tree_node
>
3622 typedef typename_info
*compare_type
;
3624 /* Hash a TYPENAME_TYPE. */
3631 hash
= (htab_hash_pointer (TYPE_CONTEXT (t
))
3632 ^ htab_hash_pointer (TYPE_IDENTIFIER (t
)));
3637 /* Compare two TYPENAME_TYPEs. */
3640 equal (tree t1
, const typename_info
*t2
)
3642 return (TYPE_IDENTIFIER (t1
) == t2
->name
3643 && TYPE_CONTEXT (t1
) == t2
->scope
3644 && TYPENAME_TYPE_FULLNAME (t1
) == t2
->template_id
3645 && TYPENAME_IS_ENUM_P (t1
) == t2
->enum_p
3646 && TYPENAME_IS_CLASS_P (t1
) == t2
->class_p
);
3650 /* Build a TYPENAME_TYPE. If the type is `typename T::t', CONTEXT is
3651 the type of `T', NAME is the IDENTIFIER_NODE for `t'.
3653 Returns the new TYPENAME_TYPE. */
3655 static GTY (()) hash_table
<typename_hasher
> *typename_htab
;
3658 build_typename_type (tree context
, tree name
, tree fullname
,
3659 enum tag_types tag_type
)
3667 if (typename_htab
== NULL
)
3668 typename_htab
= hash_table
<typename_hasher
>::create_ggc (61);
3670 ti
.scope
= FROB_CONTEXT (context
);
3672 ti
.template_id
= fullname
;
3673 ti
.enum_p
= tag_type
== enum_type
;
3674 ti
.class_p
= (tag_type
== class_type
3675 || tag_type
== record_type
3676 || tag_type
== union_type
);
3677 hash
= (htab_hash_pointer (ti
.scope
)
3678 ^ htab_hash_pointer (ti
.name
));
3680 /* See if we already have this type. */
3681 e
= typename_htab
->find_slot_with_hash (&ti
, hash
, INSERT
);
3686 /* Build the TYPENAME_TYPE. */
3687 t
= cxx_make_type (TYPENAME_TYPE
);
3688 TYPE_CONTEXT (t
) = ti
.scope
;
3689 TYPENAME_TYPE_FULLNAME (t
) = ti
.template_id
;
3690 TYPENAME_IS_ENUM_P (t
) = ti
.enum_p
;
3691 TYPENAME_IS_CLASS_P (t
) = ti
.class_p
;
3693 /* Build the corresponding TYPE_DECL. */
3694 d
= build_decl (input_location
, TYPE_DECL
, name
, t
);
3695 TYPE_NAME (TREE_TYPE (d
)) = d
;
3696 TYPE_STUB_DECL (TREE_TYPE (d
)) = d
;
3697 DECL_CONTEXT (d
) = FROB_CONTEXT (context
);
3698 DECL_ARTIFICIAL (d
) = 1;
3700 /* Store it in the hash table. */
3703 /* TYPENAME_TYPEs must always be compared structurally, because
3704 they may or may not resolve down to another type depending on
3705 the currently open classes. */
3706 SET_TYPE_STRUCTURAL_EQUALITY (t
);
3712 /* Resolve `typename CONTEXT::NAME'. TAG_TYPE indicates the tag
3713 provided to name the type. Returns an appropriate type, unless an
3714 error occurs, in which case error_mark_node is returned. If we
3715 locate a non-artificial TYPE_DECL and TF_KEEP_TYPE_DECL is set, we
3716 return that, rather than the _TYPE it corresponds to, in other
3717 cases we look through the type decl. If TF_ERROR is set, complain
3718 about errors, otherwise be quiet. */
3721 make_typename_type (tree context
, tree name
, enum tag_types tag_type
,
3722 tsubst_flags_t complain
)
3728 if (name
== error_mark_node
3729 || context
== NULL_TREE
3730 || context
== error_mark_node
)
3731 return error_mark_node
;
3735 if (!(TYPE_LANG_SPECIFIC (name
)
3736 && (CLASSTYPE_IS_TEMPLATE (name
)
3737 || CLASSTYPE_USE_TEMPLATE (name
))))
3738 name
= TYPE_IDENTIFIER (name
);
3740 /* Create a TEMPLATE_ID_EXPR for the type. */
3741 name
= build_nt (TEMPLATE_ID_EXPR
,
3742 CLASSTYPE_TI_TEMPLATE (name
),
3743 CLASSTYPE_TI_ARGS (name
));
3745 else if (TREE_CODE (name
) == TYPE_DECL
)
3746 name
= DECL_NAME (name
);
3750 if (TREE_CODE (name
) == TEMPLATE_ID_EXPR
)
3752 name
= TREE_OPERAND (name
, 0);
3753 if (DECL_TYPE_TEMPLATE_P (name
))
3754 name
= TREE_OPERAND (fullname
, 0) = DECL_NAME (name
);
3755 if (TREE_CODE (name
) != IDENTIFIER_NODE
)
3757 if (complain
& tf_error
)
3758 error ("%qD is not a type", name
);
3759 return error_mark_node
;
3762 if (TREE_CODE (name
) == TEMPLATE_DECL
)
3764 if (complain
& tf_error
)
3765 error ("%qD used without template parameters", name
);
3766 return error_mark_node
;
3768 gcc_assert (identifier_p (name
));
3769 gcc_assert (TYPE_P (context
));
3771 if (!MAYBE_CLASS_TYPE_P (context
))
3773 if (complain
& tf_error
)
3774 error ("%q#T is not a class", context
);
3775 return error_mark_node
;
3778 /* When the CONTEXT is a dependent type, NAME could refer to a
3779 dependent base class of CONTEXT. But look inside it anyway
3780 if CONTEXT is a currently open scope, in case it refers to a
3781 member of the current instantiation or a non-dependent base;
3782 lookup will stop when we hit a dependent base. */
3783 if (!dependent_scope_p (context
))
3784 /* We should only set WANT_TYPE when we're a nested typename type.
3785 Then we can give better diagnostics if we find a non-type. */
3786 t
= lookup_field (context
, name
, 2, /*want_type=*/true);
3790 if ((!t
|| TREE_CODE (t
) == TREE_LIST
) && dependent_type_p (context
))
3791 return build_typename_type (context
, name
, fullname
, tag_type
);
3793 want_template
= TREE_CODE (fullname
) == TEMPLATE_ID_EXPR
;
3797 if (complain
& tf_error
)
3799 if (!COMPLETE_TYPE_P (context
))
3800 cxx_incomplete_type_error (NULL_TREE
, context
);
3802 error (want_template
? G_("no class template named %q#T in %q#T")
3803 : G_("no type named %q#T in %q#T"), name
, context
);
3805 return error_mark_node
;
3808 /* Pull out the template from an injected-class-name (or multiple). */
3810 t
= maybe_get_template_decl_from_type_decl (t
);
3812 if (TREE_CODE (t
) == TREE_LIST
)
3814 if (complain
& tf_error
)
3816 error ("lookup of %qT in %qT is ambiguous", name
, context
);
3817 print_candidates (t
);
3819 return error_mark_node
;
3822 if (want_template
&& !DECL_TYPE_TEMPLATE_P (t
))
3824 if (complain
& tf_error
)
3825 error ("%<typename %T::%D%> names %q#T, which is not a class template",
3827 return error_mark_node
;
3829 if (!want_template
&& TREE_CODE (t
) != TYPE_DECL
)
3831 if (complain
& tf_error
)
3832 error ("%<typename %T::%D%> names %q#T, which is not a type",
3834 return error_mark_node
;
3837 if (!perform_or_defer_access_check (TYPE_BINFO (context
), t
, t
, complain
))
3838 return error_mark_node
;
3840 /* If we are currently parsing a template and if T is a typedef accessed
3841 through CONTEXT then we need to remember and check access of T at
3842 template instantiation time. */
3843 add_typedef_to_current_template_for_access_check (t
, context
, input_location
);
3846 return lookup_template_class (t
, TREE_OPERAND (fullname
, 1),
3848 /*entering_scope=*/0,
3849 complain
| tf_user
);
3851 if (DECL_ARTIFICIAL (t
) || !(complain
& tf_keep_type_decl
))
3854 maybe_record_typedef_use (t
);
3859 /* Resolve `CONTEXT::template NAME'. Returns a TEMPLATE_DECL if the name
3860 can be resolved or an UNBOUND_CLASS_TEMPLATE, unless an error occurs,
3861 in which case error_mark_node is returned.
3863 If PARM_LIST is non-NULL, also make sure that the template parameter
3864 list of TEMPLATE_DECL matches.
3866 If COMPLAIN zero, don't complain about any errors that occur. */
3869 make_unbound_class_template (tree context
, tree name
, tree parm_list
,
3870 tsubst_flags_t complain
)
3876 name
= TYPE_IDENTIFIER (name
);
3877 else if (DECL_P (name
))
3878 name
= DECL_NAME (name
);
3879 gcc_assert (identifier_p (name
));
3881 if (!dependent_type_p (context
)
3882 || currently_open_class (context
))
3884 tree tmpl
= NULL_TREE
;
3886 if (MAYBE_CLASS_TYPE_P (context
))
3887 tmpl
= lookup_field (context
, name
, 0, false);
3889 if (tmpl
&& TREE_CODE (tmpl
) == TYPE_DECL
)
3890 tmpl
= maybe_get_template_decl_from_type_decl (tmpl
);
3892 if (!tmpl
|| !DECL_TYPE_TEMPLATE_P (tmpl
))
3894 if (complain
& tf_error
)
3895 error ("no class template named %q#T in %q#T", name
, context
);
3896 return error_mark_node
;
3900 && !comp_template_parms (DECL_TEMPLATE_PARMS (tmpl
), parm_list
))
3902 if (complain
& tf_error
)
3904 error ("template parameters do not match template %qD", tmpl
);
3905 inform (DECL_SOURCE_LOCATION (tmpl
),
3906 "%qD declared here", tmpl
);
3908 return error_mark_node
;
3911 if (!perform_or_defer_access_check (TYPE_BINFO (context
), tmpl
, tmpl
,
3913 return error_mark_node
;
3918 /* Build the UNBOUND_CLASS_TEMPLATE. */
3919 t
= cxx_make_type (UNBOUND_CLASS_TEMPLATE
);
3920 TYPE_CONTEXT (t
) = FROB_CONTEXT (context
);
3921 TREE_TYPE (t
) = NULL_TREE
;
3922 SET_TYPE_STRUCTURAL_EQUALITY (t
);
3924 /* Build the corresponding TEMPLATE_DECL. */
3925 d
= build_decl (input_location
, TEMPLATE_DECL
, name
, t
);
3926 TYPE_NAME (TREE_TYPE (d
)) = d
;
3927 TYPE_STUB_DECL (TREE_TYPE (d
)) = d
;
3928 DECL_CONTEXT (d
) = FROB_CONTEXT (context
);
3929 DECL_ARTIFICIAL (d
) = 1;
3930 DECL_TEMPLATE_PARMS (d
) = parm_list
;
3937 /* Push the declarations of builtin types into the namespace.
3938 RID_INDEX is the index of the builtin type in the array
3939 RID_POINTERS. NAME is the name used when looking up the builtin
3940 type. TYPE is the _TYPE node for the builtin type. */
3943 record_builtin_type (enum rid rid_index
,
3947 tree rname
= NULL_TREE
, tname
= NULL_TREE
;
3948 tree tdecl
= NULL_TREE
;
3950 if ((int) rid_index
< (int) RID_MAX
)
3951 rname
= ridpointers
[(int) rid_index
];
3953 tname
= get_identifier (name
);
3955 /* The calls to SET_IDENTIFIER_GLOBAL_VALUE below should be
3956 eliminated. Built-in types should not be looked up name; their
3957 names are keywords that the parser can recognize. However, there
3958 is code in c-common.c that uses identifier_global_value to look
3959 up built-in types by name. */
3962 tdecl
= build_decl (BUILTINS_LOCATION
, TYPE_DECL
, tname
, type
);
3963 DECL_ARTIFICIAL (tdecl
) = 1;
3964 SET_IDENTIFIER_GLOBAL_VALUE (tname
, tdecl
);
3970 tdecl
= build_decl (BUILTINS_LOCATION
, TYPE_DECL
, rname
, type
);
3971 DECL_ARTIFICIAL (tdecl
) = 1;
3973 SET_IDENTIFIER_GLOBAL_VALUE (rname
, tdecl
);
3976 if (!TYPE_NAME (type
))
3977 TYPE_NAME (type
) = tdecl
;
3980 debug_hooks
->type_decl (tdecl
, 0);
3983 /* Push a type into the namespace so that the back ends ignore it. */
3986 record_unknown_type (tree type
, const char* name
)
3988 tree decl
= pushdecl (build_decl (UNKNOWN_LOCATION
,
3989 TYPE_DECL
, get_identifier (name
), type
));
3990 /* Make sure the "unknown type" typedecl gets ignored for debug info. */
3991 DECL_IGNORED_P (decl
) = 1;
3992 TYPE_DECL_SUPPRESS_DEBUG (decl
) = 1;
3993 TYPE_SIZE (type
) = TYPE_SIZE (void_type_node
);
3994 SET_TYPE_ALIGN (type
, 1);
3995 TYPE_USER_ALIGN (type
) = 0;
3996 SET_TYPE_MODE (type
, TYPE_MODE (void_type_node
));
3999 /* A string for which we should create an IDENTIFIER_NODE at
4002 struct predefined_identifier
4004 /* The name of the identifier. */
4005 const char *const name
;
4006 /* The place where the IDENTIFIER_NODE should be stored. */
4008 /* Nonzero if this is the name of a constructor or destructor. */
4009 const int ctor_or_dtor_p
;
4012 /* Create all the predefined identifiers. */
4015 initialize_predefined_identifiers (void)
4017 const predefined_identifier
*pid
;
4019 /* A table of identifiers to create at startup. */
4020 static const predefined_identifier predefined_identifiers
[] = {
4021 { "C++", &lang_name_cplusplus
, 0 },
4022 { "C", &lang_name_c
, 0 },
4023 /* Some of these names have a trailing space so that it is
4024 impossible for them to conflict with names written by users. */
4025 { "__ct ", &ctor_identifier
, 1 },
4026 { "__base_ctor ", &base_ctor_identifier
, 1 },
4027 { "__comp_ctor ", &complete_ctor_identifier
, 1 },
4028 { "__dt ", &dtor_identifier
, 1 },
4029 { "__comp_dtor ", &complete_dtor_identifier
, 1 },
4030 { "__base_dtor ", &base_dtor_identifier
, 1 },
4031 { "__deleting_dtor ", &deleting_dtor_identifier
, 1 },
4032 { IN_CHARGE_NAME
, &in_charge_identifier
, 0 },
4033 { "nelts", &nelts_identifier
, 0 },
4034 { THIS_NAME
, &this_identifier
, 0 },
4035 { VTABLE_DELTA_NAME
, &delta_identifier
, 0 },
4036 { VTABLE_PFN_NAME
, &pfn_identifier
, 0 },
4037 { "_vptr", &vptr_identifier
, 0 },
4038 { "__vtt_parm", &vtt_parm_identifier
, 0 },
4039 { "::", &global_scope_name
, 0 },
4040 { "std", &std_identifier
, 0 },
4041 { "auto", &auto_identifier
, 0 },
4042 { "decltype(auto)", &decltype_auto_identifier
, 0 },
4046 for (pid
= predefined_identifiers
; pid
->name
; ++pid
)
4048 *pid
->node
= get_identifier (pid
->name
);
4049 if (pid
->ctor_or_dtor_p
)
4050 IDENTIFIER_CTOR_OR_DTOR_P (*pid
->node
) = 1;
4054 /* Create the predefined scalar types of C,
4055 and some nodes representing standard constants (0, 1, (void *)0).
4056 Initialize the global binding level.
4057 Make definitions for built-in primitive functions. */
4060 cxx_init_decl_processing (void)
4063 tree void_ftype_ptr
;
4065 /* Create all the identifiers we need. */
4066 initialize_predefined_identifiers ();
4068 /* Create the global variables. */
4069 push_to_top_level ();
4071 current_function_decl
= NULL_TREE
;
4072 current_binding_level
= NULL
;
4073 /* Enter the global namespace. */
4074 gcc_assert (global_namespace
== NULL_TREE
);
4075 global_namespace
= build_lang_decl (NAMESPACE_DECL
, global_scope_name
,
4077 DECL_CONTEXT (global_namespace
)
4078 = build_translation_unit_decl (get_identifier (main_input_filename
));
4079 debug_hooks
->register_main_translation_unit
4080 (DECL_CONTEXT (global_namespace
));
4081 TREE_PUBLIC (global_namespace
) = 1;
4082 begin_scope (sk_namespace
, global_namespace
);
4084 if (flag_visibility_ms_compat
)
4085 default_visibility
= VISIBILITY_HIDDEN
;
4088 current_lang_name
= lang_name_c
;
4090 /* Create the `std' namespace. */
4091 push_namespace (std_identifier
);
4092 std_node
= current_namespace
;
4095 flag_noexcept_type
= (cxx_dialect
>= cxx1z
);
4097 c_common_nodes_and_builtins ();
4099 integer_two_node
= build_int_cst (NULL_TREE
, 2);
4101 record_builtin_type (RID_BOOL
, "bool", boolean_type_node
);
4102 truthvalue_type_node
= boolean_type_node
;
4103 truthvalue_false_node
= boolean_false_node
;
4104 truthvalue_true_node
= boolean_true_node
;
4106 empty_except_spec
= build_tree_list (NULL_TREE
, NULL_TREE
);
4107 noexcept_true_spec
= build_tree_list (boolean_true_node
, NULL_TREE
);
4108 noexcept_false_spec
= build_tree_list (boolean_false_node
, NULL_TREE
);
4111 record_builtin_type (RID_MAX
, NULL
, string_type_node
);
4114 delta_type_node
= ptrdiff_type_node
;
4115 vtable_index_type
= ptrdiff_type_node
;
4117 vtt_parm_type
= build_pointer_type (const_ptr_type_node
);
4118 void_ftype
= build_function_type_list (void_type_node
, NULL_TREE
);
4119 void_ftype_ptr
= build_function_type_list (void_type_node
,
4120 ptr_type_node
, NULL_TREE
);
4122 = build_exception_variant (void_ftype_ptr
, empty_except_spec
);
4124 /* C++ extensions */
4126 unknown_type_node
= make_node (LANG_TYPE
);
4127 record_unknown_type (unknown_type_node
, "unknown type");
4129 /* Indirecting an UNKNOWN_TYPE node yields an UNKNOWN_TYPE node. */
4130 TREE_TYPE (unknown_type_node
) = unknown_type_node
;
4132 /* Looking up TYPE_POINTER_TO and TYPE_REFERENCE_TO yield the same
4134 TYPE_POINTER_TO (unknown_type_node
) = unknown_type_node
;
4135 TYPE_REFERENCE_TO (unknown_type_node
) = unknown_type_node
;
4137 init_list_type_node
= make_node (LANG_TYPE
);
4138 record_unknown_type (init_list_type_node
, "init list");
4141 /* Make sure we get a unique function type, so we can give
4142 its pointer type a name. (This wins for gdb.) */
4143 tree vfunc_type
= make_node (FUNCTION_TYPE
);
4144 TREE_TYPE (vfunc_type
) = integer_type_node
;
4145 TYPE_ARG_TYPES (vfunc_type
) = NULL_TREE
;
4146 layout_type (vfunc_type
);
4148 vtable_entry_type
= build_pointer_type (vfunc_type
);
4150 record_builtin_type (RID_MAX
, VTBL_PTR_TYPE
, vtable_entry_type
);
4153 = build_cplus_array_type (vtable_entry_type
, NULL_TREE
);
4154 layout_type (vtbl_type_node
);
4155 vtbl_type_node
= cp_build_qualified_type (vtbl_type_node
, TYPE_QUAL_CONST
);
4156 record_builtin_type (RID_MAX
, NULL
, vtbl_type_node
);
4157 vtbl_ptr_type_node
= build_pointer_type (vtable_entry_type
);
4158 layout_type (vtbl_ptr_type_node
);
4159 record_builtin_type (RID_MAX
, NULL
, vtbl_ptr_type_node
);
4161 push_namespace (get_identifier ("__cxxabiv1"));
4162 abi_node
= current_namespace
;
4165 global_type_node
= make_node (LANG_TYPE
);
4166 record_unknown_type (global_type_node
, "global type");
4168 any_targ_node
= make_node (LANG_TYPE
);
4169 record_unknown_type (any_targ_node
, "any type");
4172 current_lang_name
= lang_name_cplusplus
;
4174 if (aligned_new_threshold
> 1
4175 && !pow2p_hwi (aligned_new_threshold
))
4177 error ("-faligned-new=%d is not a power of two", aligned_new_threshold
);
4178 aligned_new_threshold
= 1;
4180 if (aligned_new_threshold
== -1)
4181 aligned_new_threshold
= (cxx_dialect
>= cxx1z
) ? 1 : 0;
4182 if (aligned_new_threshold
== 1)
4183 aligned_new_threshold
= malloc_alignment () / BITS_PER_UNIT
;
4186 tree newattrs
, extvisattr
;
4187 tree newtype
, deltype
;
4188 tree ptr_ftype_sizetype
;
4192 = build_function_type_list (ptr_type_node
, size_type_node
, NULL_TREE
);
4193 if (cxx_dialect
== cxx98
)
4196 tree bad_alloc_type_node
;
4197 tree bad_alloc_decl
;
4199 push_namespace (std_identifier
);
4200 bad_alloc_id
= get_identifier ("bad_alloc");
4201 bad_alloc_type_node
= make_class_type (RECORD_TYPE
);
4202 TYPE_CONTEXT (bad_alloc_type_node
) = current_namespace
;
4204 = create_implicit_typedef (bad_alloc_id
, bad_alloc_type_node
);
4205 DECL_CONTEXT (bad_alloc_decl
) = current_namespace
;
4209 = add_exception_specifier (NULL_TREE
, bad_alloc_type_node
, -1);
4212 new_eh_spec
= noexcept_false_spec
;
4214 /* Ensure attribs.c is initialized. */
4217 /* Ensure constraint.cc is initialized. */
4218 init_constraint_processing ();
4220 extvisattr
= build_tree_list (get_identifier ("externally_visible"),
4222 newattrs
= tree_cons (get_identifier ("alloc_size"),
4223 build_tree_list (NULL_TREE
, integer_one_node
),
4225 newtype
= cp_build_type_attribute_variant (ptr_ftype_sizetype
, newattrs
);
4226 newtype
= build_exception_variant (newtype
, new_eh_spec
);
4227 deltype
= cp_build_type_attribute_variant (void_ftype_ptr
, extvisattr
);
4228 deltype
= build_exception_variant (deltype
, empty_except_spec
);
4229 tree opnew
= push_cp_library_fn (NEW_EXPR
, newtype
, 0);
4230 DECL_IS_MALLOC (opnew
) = 1;
4231 DECL_IS_OPERATOR_NEW (opnew
) = 1;
4232 opnew
= push_cp_library_fn (VEC_NEW_EXPR
, newtype
, 0);
4233 DECL_IS_MALLOC (opnew
) = 1;
4234 DECL_IS_OPERATOR_NEW (opnew
) = 1;
4235 push_cp_library_fn (DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4236 push_cp_library_fn (VEC_DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4237 if (flag_sized_deallocation
)
4239 /* Also push the sized deallocation variants:
4240 void operator delete(void*, std::size_t) throw();
4241 void operator delete[](void*, std::size_t) throw(); */
4242 tree void_ftype_ptr_size
4243 = build_function_type_list (void_type_node
, ptr_type_node
,
4244 size_type_node
, NULL_TREE
);
4245 deltype
= cp_build_type_attribute_variant (void_ftype_ptr_size
,
4247 deltype
= build_exception_variant (deltype
, empty_except_spec
);
4248 push_cp_library_fn (DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4249 push_cp_library_fn (VEC_DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4252 if (aligned_new_threshold
)
4254 push_namespace (std_identifier
);
4255 tree align_id
= get_identifier ("align_val_t");
4256 align_type_node
= start_enum (align_id
, NULL_TREE
, size_type_node
,
4257 NULL_TREE
, /*scoped*/true, NULL
);
4260 /* operator new (size_t, align_val_t); */
4261 newtype
= build_function_type_list (ptr_type_node
, size_type_node
,
4262 align_type_node
, NULL_TREE
);
4263 newtype
= cp_build_type_attribute_variant (newtype
, newattrs
);
4264 newtype
= build_exception_variant (newtype
, new_eh_spec
);
4265 opnew
= push_cp_library_fn (NEW_EXPR
, newtype
, 0);
4266 DECL_IS_MALLOC (opnew
) = 1;
4267 DECL_IS_OPERATOR_NEW (opnew
) = 1;
4268 opnew
= push_cp_library_fn (VEC_NEW_EXPR
, newtype
, 0);
4269 DECL_IS_MALLOC (opnew
) = 1;
4270 DECL_IS_OPERATOR_NEW (opnew
) = 1;
4272 /* operator delete (void *, align_val_t); */
4273 deltype
= build_function_type_list (void_type_node
, ptr_type_node
,
4274 align_type_node
, NULL_TREE
);
4275 deltype
= cp_build_type_attribute_variant (deltype
, extvisattr
);
4276 deltype
= build_exception_variant (deltype
, empty_except_spec
);
4277 push_cp_library_fn (DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4278 push_cp_library_fn (VEC_DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4280 if (flag_sized_deallocation
)
4282 /* operator delete (void *, size_t, align_val_t); */
4283 deltype
= build_function_type_list (void_type_node
, ptr_type_node
,
4284 size_type_node
, align_type_node
,
4286 deltype
= cp_build_type_attribute_variant (deltype
, extvisattr
);
4287 deltype
= build_exception_variant (deltype
, empty_except_spec
);
4288 push_cp_library_fn (DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4289 push_cp_library_fn (VEC_DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4293 nullptr_type_node
= make_node (NULLPTR_TYPE
);
4294 TYPE_SIZE (nullptr_type_node
) = bitsize_int (GET_MODE_BITSIZE (ptr_mode
));
4295 TYPE_SIZE_UNIT (nullptr_type_node
) = size_int (GET_MODE_SIZE (ptr_mode
));
4296 TYPE_UNSIGNED (nullptr_type_node
) = 1;
4297 TYPE_PRECISION (nullptr_type_node
) = GET_MODE_BITSIZE (ptr_mode
);
4298 if (abi_version_at_least (9))
4299 SET_TYPE_ALIGN (nullptr_type_node
, GET_MODE_ALIGNMENT (ptr_mode
));
4300 SET_TYPE_MODE (nullptr_type_node
, ptr_mode
);
4301 record_builtin_type (RID_MAX
, "decltype(nullptr)", nullptr_type_node
);
4302 nullptr_node
= build_int_cst (nullptr_type_node
, 0);
4306 = build_library_fn_ptr ("__cxa_pure_virtual", void_ftype
,
4307 ECF_NORETURN
| ECF_NOTHROW
);
4309 /* Perform other language dependent initializations. */
4310 init_class_processing ();
4311 init_rtti_processing ();
4312 init_template_processing ();
4314 if (flag_exceptions
)
4315 init_exception_processing ();
4317 if (! supports_one_only ())
4320 make_fname_decl
= cp_make_fname_decl
;
4321 start_fname_decls ();
4323 /* Show we use EH for cleanups. */
4324 if (flag_exceptions
)
4325 using_eh_for_cleanups ();
4328 /* Generate an initializer for a function naming variable from
4329 NAME. NAME may be NULL, to indicate a dependent name. TYPE_P is
4330 filled in with the type of the init. */
4333 cp_fname_init (const char* name
, tree
*type_p
)
4335 tree domain
= NULL_TREE
;
4337 tree init
= NULL_TREE
;
4342 length
= strlen (name
);
4343 domain
= build_index_type (size_int (length
));
4344 init
= build_string (length
+ 1, name
);
4347 type
= cp_build_qualified_type (char_type_node
, TYPE_QUAL_CONST
);
4348 type
= build_cplus_array_type (type
, domain
);
4353 TREE_TYPE (init
) = type
;
4355 init
= error_mark_node
;
4360 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give
4361 the decl, LOC is the location to give the decl, NAME is the
4362 initialization string and TYPE_DEP indicates whether NAME depended
4363 on the type of the function. We make use of that to detect
4364 __PRETTY_FUNCTION__ inside a template fn. This is being done lazily
4365 at the point of first use, so we mustn't push the decl now. */
4368 cp_make_fname_decl (location_t loc
, tree id
, int type_dep
)
4370 const char *const name
= (type_dep
&& processing_template_decl
4371 ? NULL
: fname_as_string (type_dep
));
4373 tree init
= cp_fname_init (name
, &type
);
4374 tree decl
= build_decl (loc
, VAR_DECL
, id
, type
);
4377 free (CONST_CAST (char *, name
));
4379 /* As we're using pushdecl_with_scope, we must set the context. */
4380 DECL_CONTEXT (decl
) = current_function_decl
;
4382 TREE_STATIC (decl
) = 1;
4383 TREE_READONLY (decl
) = 1;
4384 DECL_ARTIFICIAL (decl
) = 1;
4386 TREE_USED (decl
) = 1;
4388 if (current_function_decl
)
4390 cp_binding_level
*b
= current_binding_level
;
4391 if (b
->kind
== sk_function_parms
)
4392 return error_mark_node
;
4393 while (b
->level_chain
->kind
!= sk_function_parms
)
4395 pushdecl_with_scope (decl
, b
, /*is_friend=*/false);
4396 cp_finish_decl (decl
, init
, /*init_const_expr_p=*/false, NULL_TREE
,
4397 LOOKUP_ONLYCONVERTING
);
4401 DECL_THIS_STATIC (decl
) = true;
4402 pushdecl_top_level_and_finish (decl
, init
);
4409 builtin_function_1 (tree decl
, tree context
, bool is_global
)
4411 tree id
= DECL_NAME (decl
);
4412 const char *name
= IDENTIFIER_POINTER (id
);
4414 retrofit_lang_decl (decl
);
4416 DECL_ARTIFICIAL (decl
) = 1;
4417 SET_OVERLOADED_OPERATOR_CODE (decl
, ERROR_MARK
);
4418 SET_DECL_LANGUAGE (decl
, lang_c
);
4419 /* Runtime library routines are, by definition, available in an
4420 external shared object. */
4421 DECL_VISIBILITY (decl
) = VISIBILITY_DEFAULT
;
4422 DECL_VISIBILITY_SPECIFIED (decl
) = 1;
4424 DECL_CONTEXT (decl
) = context
;
4427 pushdecl_top_level (decl
);
4431 /* A function in the user's namespace should have an explicit
4432 declaration before it is used. Mark the built-in function as
4433 anticipated but not actually declared. */
4434 if (name
[0] != '_' || name
[1] != '_')
4435 DECL_ANTICIPATED (decl
) = 1;
4436 else if (strncmp (name
+ 2, "builtin_", strlen ("builtin_")) != 0)
4438 size_t len
= strlen (name
);
4440 /* Treat __*_chk fortification functions as anticipated as well,
4441 unless they are __builtin_*. */
4442 if (len
> strlen ("___chk")
4443 && memcmp (name
+ len
- strlen ("_chk"),
4444 "_chk", strlen ("_chk") + 1) == 0)
4445 DECL_ANTICIPATED (decl
) = 1;
4452 cxx_builtin_function (tree decl
)
4454 tree id
= DECL_NAME (decl
);
4455 const char *name
= IDENTIFIER_POINTER (id
);
4456 /* All builtins that don't begin with an '_' should additionally
4457 go in the 'std' namespace. */
4460 tree decl2
= copy_node(decl
);
4461 push_namespace (std_identifier
);
4462 builtin_function_1 (decl2
, std_node
, false);
4466 return builtin_function_1 (decl
, NULL_TREE
, false);
4469 /* Like cxx_builtin_function, but guarantee the function is added to the global
4470 scope. This is to allow function specific options to add new machine
4471 dependent builtins when the target ISA changes via attribute((target(...)))
4472 which saves space on program startup if the program does not use non-generic
4476 cxx_builtin_function_ext_scope (tree decl
)
4479 tree id
= DECL_NAME (decl
);
4480 const char *name
= IDENTIFIER_POINTER (id
);
4481 /* All builtins that don't begin with an '_' should additionally
4482 go in the 'std' namespace. */
4485 tree decl2
= copy_node(decl
);
4486 push_namespace (std_identifier
);
4487 builtin_function_1 (decl2
, std_node
, true);
4491 return builtin_function_1 (decl
, NULL_TREE
, true);
4494 /* Generate a FUNCTION_DECL with the typical flags for a runtime library
4495 function. Not called directly. */
4498 build_library_fn (tree name
, enum tree_code operator_code
, tree type
,
4501 tree fn
= build_lang_decl (FUNCTION_DECL
, name
, type
);
4502 DECL_EXTERNAL (fn
) = 1;
4503 TREE_PUBLIC (fn
) = 1;
4504 DECL_ARTIFICIAL (fn
) = 1;
4505 SET_OVERLOADED_OPERATOR_CODE (fn
, operator_code
);
4506 SET_DECL_LANGUAGE (fn
, lang_c
);
4507 /* Runtime library routines are, by definition, available in an
4508 external shared object. */
4509 DECL_VISIBILITY (fn
) = VISIBILITY_DEFAULT
;
4510 DECL_VISIBILITY_SPECIFIED (fn
) = 1;
4511 set_call_expr_flags (fn
, ecf_flags
);
4515 /* Returns the _DECL for a library function with C++ linkage. */
4518 build_cp_library_fn (tree name
, enum tree_code operator_code
, tree type
,
4521 tree fn
= build_library_fn (name
, operator_code
, type
, ecf_flags
);
4522 DECL_CONTEXT (fn
) = FROB_CONTEXT (current_namespace
);
4523 SET_DECL_LANGUAGE (fn
, lang_cplusplus
);
4527 /* Like build_library_fn, but takes a C string instead of an
4531 build_library_fn_ptr (const char* name
, tree type
, int ecf_flags
)
4533 return build_library_fn (get_identifier (name
), ERROR_MARK
, type
, ecf_flags
);
4536 /* Like build_cp_library_fn, but takes a C string instead of an
4540 build_cp_library_fn_ptr (const char* name
, tree type
, int ecf_flags
)
4542 return build_cp_library_fn (get_identifier (name
), ERROR_MARK
, type
,
4546 /* Like build_library_fn, but also pushes the function so that we will
4547 be able to find it via IDENTIFIER_GLOBAL_VALUE. Also, the function
4548 may throw exceptions listed in RAISES. */
4551 push_library_fn (tree name
, tree type
, tree raises
, int ecf_flags
)
4556 type
= build_exception_variant (type
, raises
);
4558 fn
= build_library_fn (name
, ERROR_MARK
, type
, ecf_flags
);
4559 pushdecl_top_level (fn
);
4563 /* Like build_cp_library_fn, but also pushes the function so that it
4564 will be found by normal lookup. */
4567 push_cp_library_fn (enum tree_code operator_code
, tree type
,
4570 tree fn
= build_cp_library_fn (cp_operator_id (operator_code
),
4575 apply_tm_attr (fn
, get_identifier ("transaction_safe"));
4579 /* Like push_library_fn, but takes a TREE_LIST of parm types rather than
4583 push_void_library_fn (tree name
, tree parmtypes
, int ecf_flags
)
4585 tree type
= build_function_type (void_type_node
, parmtypes
);
4586 return push_library_fn (name
, type
, NULL_TREE
, ecf_flags
);
4589 /* Like push_library_fn, but also note that this function throws
4590 and does not return. Used for __throw_foo and the like. */
4593 push_throw_library_fn (tree name
, tree type
)
4595 tree fn
= push_library_fn (name
, type
, NULL_TREE
, ECF_NORETURN
);
4599 /* When we call finish_struct for an anonymous union, we create
4600 default copy constructors and such. But, an anonymous union
4601 shouldn't have such things; this function undoes the damage to the
4602 anonymous union type T.
4604 (The reason that we create the synthesized methods is that we don't
4605 distinguish `union { int i; }' from `typedef union { int i; } U'.
4606 The first is an anonymous union; the second is just an ordinary
4610 fixup_anonymous_aggr (tree t
)
4614 /* Wipe out memory of synthesized methods. */
4615 TYPE_HAS_USER_CONSTRUCTOR (t
) = 0;
4616 TYPE_HAS_DEFAULT_CONSTRUCTOR (t
) = 0;
4617 TYPE_HAS_COPY_CTOR (t
) = 0;
4618 TYPE_HAS_CONST_COPY_CTOR (t
) = 0;
4619 TYPE_HAS_COPY_ASSIGN (t
) = 0;
4620 TYPE_HAS_CONST_COPY_ASSIGN (t
) = 0;
4622 /* Splice the implicitly generated functions out of the TYPE_METHODS
4624 q
= &TYPE_METHODS (t
);
4627 if (DECL_ARTIFICIAL (*q
))
4628 *q
= TREE_CHAIN (*q
);
4630 q
= &DECL_CHAIN (*q
);
4633 /* ISO C++ 9.5.3. Anonymous unions may not have function members. */
4634 if (TYPE_METHODS (t
))
4636 tree decl
= TYPE_MAIN_DECL (t
);
4638 if (TREE_CODE (t
) != UNION_TYPE
)
4639 error_at (DECL_SOURCE_LOCATION (decl
),
4640 "an anonymous struct cannot have function members");
4642 error_at (DECL_SOURCE_LOCATION (decl
),
4643 "an anonymous union cannot have function members");
4646 /* Anonymous aggregates cannot have fields with ctors, dtors or complex
4647 assignment operators (because they cannot have these methods themselves).
4648 For anonymous unions this is already checked because they are not allowed
4649 in any union, otherwise we have to check it. */
4650 if (TREE_CODE (t
) != UNION_TYPE
)
4654 for (field
= TYPE_FIELDS (t
); field
; field
= DECL_CHAIN (field
))
4655 if (TREE_CODE (field
) == FIELD_DECL
)
4657 type
= TREE_TYPE (field
);
4658 if (CLASS_TYPE_P (type
))
4660 if (TYPE_NEEDS_CONSTRUCTING (type
))
4661 error ("member %q+#D with constructor not allowed "
4662 "in anonymous aggregate", field
);
4663 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type
))
4664 error ("member %q+#D with destructor not allowed "
4665 "in anonymous aggregate", field
);
4666 if (TYPE_HAS_COMPLEX_COPY_ASSIGN (type
))
4667 error ("member %q+#D with copy assignment operator "
4668 "not allowed in anonymous aggregate", field
);
4674 /* Warn for an attribute located at LOCATION that appertains to the
4675 class type CLASS_TYPE that has not been properly placed after its
4676 class-key, in it class-specifier. */
4679 warn_misplaced_attr_for_class_type (source_location location
,
4682 gcc_assert (OVERLOAD_TYPE_P (class_type
));
4684 if (warning_at (location
, OPT_Wattributes
,
4685 "attribute ignored in declaration "
4686 "of %q#T", class_type
))
4688 "attribute for %q#T must follow the %qs keyword",
4689 class_type
, class_key_or_enum_as_string (class_type
));
4692 /* Make sure that a declaration with no declarator is well-formed, i.e.
4693 just declares a tagged type or anonymous union.
4695 Returns the type declared; or NULL_TREE if none. */
4698 check_tag_decl (cp_decl_specifier_seq
*declspecs
,
4699 bool explicit_type_instantiation_p
)
4701 int saw_friend
= decl_spec_seq_has_spec_p (declspecs
, ds_friend
);
4702 int saw_typedef
= decl_spec_seq_has_spec_p (declspecs
, ds_typedef
);
4703 /* If a class, struct, or enum type is declared by the DECLSPECS
4704 (i.e, if a class-specifier, enum-specifier, or non-typename
4705 elaborated-type-specifier appears in the DECLSPECS),
4706 DECLARED_TYPE is set to the corresponding type. */
4707 tree declared_type
= NULL_TREE
;
4708 bool error_p
= false;
4710 if (declspecs
->multiple_types_p
)
4711 error ("multiple types in one declaration");
4712 else if (declspecs
->redefined_builtin_type
)
4714 if (!in_system_header_at (input_location
))
4715 permerror (declspecs
->locations
[ds_redefined_builtin_type_spec
],
4716 "redeclaration of C++ built-in type %qT",
4717 declspecs
->redefined_builtin_type
);
4722 && TYPE_P (declspecs
->type
)
4723 && ((TREE_CODE (declspecs
->type
) != TYPENAME_TYPE
4724 && MAYBE_CLASS_TYPE_P (declspecs
->type
))
4725 || TREE_CODE (declspecs
->type
) == ENUMERAL_TYPE
))
4726 declared_type
= declspecs
->type
;
4727 else if (declspecs
->type
== error_mark_node
)
4729 if (declared_type
== NULL_TREE
&& ! saw_friend
&& !error_p
)
4730 permerror (input_location
, "declaration does not declare anything");
4731 else if (declared_type
!= NULL_TREE
&& type_uses_auto (declared_type
))
4733 error_at (declspecs
->locations
[ds_type_spec
],
4734 "%<auto%> can only be specified for variables "
4735 "or function declarations");
4736 return error_mark_node
;
4738 /* Check for an anonymous union. */
4739 else if (declared_type
&& RECORD_OR_UNION_CODE_P (TREE_CODE (declared_type
))
4740 && TYPE_UNNAMED_P (declared_type
))
4742 /* 7/3 In a simple-declaration, the optional init-declarator-list
4743 can be omitted only when declaring a class (clause 9) or
4744 enumeration (7.2), that is, when the decl-specifier-seq contains
4745 either a class-specifier, an elaborated-type-specifier with
4746 a class-key (9.1), or an enum-specifier. In these cases and
4747 whenever a class-specifier or enum-specifier is present in the
4748 decl-specifier-seq, the identifiers in these specifiers are among
4749 the names being declared by the declaration (as class-name,
4750 enum-names, or enumerators, depending on the syntax). In such
4751 cases, and except for the declaration of an unnamed bit-field (9.6),
4752 the decl-specifier-seq shall introduce one or more names into the
4753 program, or shall redeclare a name introduced by a previous
4754 declaration. [Example:
4755 enum { }; // ill-formed
4756 typedef class { }; // ill-formed
4760 error ("missing type-name in typedef-declaration");
4763 /* Anonymous unions are objects, so they can have specifiers. */;
4764 SET_ANON_AGGR_TYPE_P (declared_type
);
4766 if (TREE_CODE (declared_type
) != UNION_TYPE
4767 && !in_system_header_at (input_location
))
4768 pedwarn (input_location
, OPT_Wpedantic
, "ISO C++ prohibits anonymous structs");
4773 if (decl_spec_seq_has_spec_p (declspecs
, ds_inline
))
4774 error_at (declspecs
->locations
[ds_inline
],
4775 "%<inline%> can only be specified for functions");
4776 else if (decl_spec_seq_has_spec_p (declspecs
, ds_virtual
))
4777 error_at (declspecs
->locations
[ds_virtual
],
4778 "%<virtual%> can only be specified for functions");
4780 && (!current_class_type
4781 || current_scope () != current_class_type
))
4782 error_at (declspecs
->locations
[ds_friend
],
4783 "%<friend%> can only be specified inside a class");
4784 else if (decl_spec_seq_has_spec_p (declspecs
, ds_explicit
))
4785 error_at (declspecs
->locations
[ds_explicit
],
4786 "%<explicit%> can only be specified for constructors");
4787 else if (declspecs
->storage_class
)
4788 error_at (declspecs
->locations
[ds_storage_class
],
4789 "a storage class can only be specified for objects "
4791 else if (decl_spec_seq_has_spec_p (declspecs
, ds_const
))
4792 error_at (declspecs
->locations
[ds_const
],
4793 "%<const%> can only be specified for objects and "
4795 else if (decl_spec_seq_has_spec_p (declspecs
, ds_volatile
))
4796 error_at (declspecs
->locations
[ds_volatile
],
4797 "%<volatile%> can only be specified for objects and "
4799 else if (decl_spec_seq_has_spec_p (declspecs
, ds_restrict
))
4800 error_at (declspecs
->locations
[ds_restrict
],
4801 "%<__restrict%> can only be specified for objects and "
4803 else if (decl_spec_seq_has_spec_p (declspecs
, ds_thread
))
4804 error_at (declspecs
->locations
[ds_thread
],
4805 "%<__thread%> can only be specified for objects "
4807 else if (saw_typedef
)
4808 warning_at (declspecs
->locations
[ds_typedef
], 0,
4809 "%<typedef%> was ignored in this declaration");
4810 else if (decl_spec_seq_has_spec_p (declspecs
, ds_constexpr
))
4811 error_at (declspecs
->locations
[ds_constexpr
],
4812 "%<constexpr%> cannot be used for type declarations");
4815 if (declspecs
->attributes
&& warn_attributes
&& declared_type
)
4818 if (!CLASS_TYPE_P (declared_type
)
4819 || !CLASSTYPE_TEMPLATE_INSTANTIATION (declared_type
))
4820 /* For a non-template class, use the name location. */
4821 loc
= location_of (declared_type
);
4823 /* For a template class (an explicit instantiation), use the
4824 current location. */
4825 loc
= input_location
;
4827 if (explicit_type_instantiation_p
)
4828 /* [dcl.attr.grammar]/4:
4830 No attribute-specifier-seq shall appertain to an explicit
4833 if (warning_at (loc
, OPT_Wattributes
,
4834 "attribute ignored in explicit instantiation %q#T",
4837 "no attribute can be applied to "
4838 "an explicit instantiation");
4841 warn_misplaced_attr_for_class_type (loc
, declared_type
);
4844 return declared_type
;
4847 /* Called when a declaration is seen that contains no names to declare.
4848 If its type is a reference to a structure, union or enum inherited
4849 from a containing scope, shadow that tag name for the current scope
4850 with a forward reference.
4851 If its type defines a new named structure or union
4852 or defines an enum, it is valid but we need not do anything here.
4853 Otherwise, it is an error.
4855 C++: may have to grok the declspecs to learn about static,
4856 complain for anonymous unions.
4858 Returns the TYPE declared -- or NULL_TREE if none. */
4861 shadow_tag (cp_decl_specifier_seq
*declspecs
)
4863 tree t
= check_tag_decl (declspecs
,
4864 /*explicit_type_instantiation_p=*/false);
4869 if (maybe_process_partial_specialization (t
) == error_mark_node
)
4872 /* This is where the variables in an anonymous union are
4873 declared. An anonymous union declaration looks like:
4875 because there is no declarator after the union, the parser
4876 sends that declaration here. */
4877 if (ANON_AGGR_TYPE_P (t
))
4879 fixup_anonymous_aggr (t
);
4881 if (TYPE_FIELDS (t
))
4883 tree decl
= grokdeclarator (/*declarator=*/NULL
,
4884 declspecs
, NORMAL
, 0, NULL
);
4885 finish_anon_union (decl
);
4892 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
4895 groktypename (cp_decl_specifier_seq
*type_specifiers
,
4896 const cp_declarator
*declarator
,
4897 bool is_template_arg
)
4901 enum decl_context context
4902 = is_template_arg
? TEMPLATE_TYPE_ARG
: TYPENAME
;
4903 attrs
= type_specifiers
->attributes
;
4904 type_specifiers
->attributes
= NULL_TREE
;
4905 type
= grokdeclarator (declarator
, type_specifiers
, context
, 0, &attrs
);
4906 if (attrs
&& type
!= error_mark_node
)
4908 if (CLASS_TYPE_P (type
))
4909 warning (OPT_Wattributes
, "ignoring attributes applied to class type %qT "
4910 "outside of definition", type
);
4911 else if (MAYBE_CLASS_TYPE_P (type
))
4912 /* A template type parameter or other dependent type. */
4913 warning (OPT_Wattributes
, "ignoring attributes applied to dependent "
4914 "type %qT without an associated declaration", type
);
4916 cplus_decl_attributes (&type
, attrs
, 0);
4921 /* Process a DECLARATOR for a function-scope variable declaration,
4922 namespace-scope variable declaration, or function declaration.
4923 (Function definitions go through start_function; class member
4924 declarations appearing in the body of the class go through
4925 grokfield.) The DECL corresponding to the DECLARATOR is returned.
4926 If an error occurs, the error_mark_node is returned instead.
4928 DECLSPECS are the decl-specifiers for the declaration. INITIALIZED is
4929 SD_INITIALIZED if an explicit initializer is present, or SD_DEFAULTED
4930 for an explicitly defaulted function, or SD_DELETED for an explicitly
4931 deleted function, but 0 (SD_UNINITIALIZED) if this is a variable
4932 implicitly initialized via a default constructor. ATTRIBUTES and
4933 PREFIX_ATTRIBUTES are GNU attributes associated with this declaration.
4935 The scope represented by the context of the returned DECL is pushed
4936 (if it is not the global namespace) and is assigned to
4937 *PUSHED_SCOPE_P. The caller is then responsible for calling
4938 pop_scope on *PUSHED_SCOPE_P if it is set. */
4941 start_decl (const cp_declarator
*declarator
,
4942 cp_decl_specifier_seq
*declspecs
,
4945 tree prefix_attributes
,
4946 tree
*pushed_scope_p
)
4954 *pushed_scope_p
= NULL_TREE
;
4956 /* An object declared as __attribute__((deprecated)) suppresses
4957 warnings of uses of other deprecated items. */
4958 if (lookup_attribute ("deprecated", attributes
))
4959 deprecated_state
= DEPRECATED_SUPPRESS
;
4961 attributes
= chainon (attributes
, prefix_attributes
);
4963 decl
= grokdeclarator (declarator
, declspecs
, NORMAL
, initialized
,
4966 deprecated_state
= DEPRECATED_NORMAL
;
4968 if (decl
== NULL_TREE
|| VOID_TYPE_P (decl
)
4969 || decl
== error_mark_node
)
4970 return error_mark_node
;
4972 context
= CP_DECL_CONTEXT (decl
);
4973 if (context
!= global_namespace
)
4974 *pushed_scope_p
= push_scope (context
);
4976 /* Is it valid for this decl to have an initializer at all?
4977 If not, set INITIALIZED to zero, which will indirectly
4978 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
4980 && TREE_CODE (decl
) == TYPE_DECL
)
4982 error ("typedef %qD is initialized (use decltype instead)", decl
);
4983 return error_mark_node
;
4988 if (! toplevel_bindings_p ()
4989 && DECL_EXTERNAL (decl
))
4990 warning (0, "declaration of %q#D has %<extern%> and is initialized",
4992 DECL_EXTERNAL (decl
) = 0;
4993 if (toplevel_bindings_p ())
4994 TREE_STATIC (decl
) = 1;
4996 alias
= lookup_attribute ("alias", DECL_ATTRIBUTES (decl
)) != 0;
4998 if (alias
&& TREE_CODE (decl
) == FUNCTION_DECL
)
4999 record_key_method_defined (decl
);
5001 /* If this is a typedef that names the class for linkage purposes
5002 (7.1.3p8), apply any attributes directly to the type. */
5003 if (TREE_CODE (decl
) == TYPE_DECL
5004 && OVERLOAD_TYPE_P (TREE_TYPE (decl
))
5005 && decl
== TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (decl
))))
5006 flags
= ATTR_FLAG_TYPE_IN_PLACE
;
5010 /* Set attributes here so if duplicate decl, will have proper attributes. */
5011 cplus_decl_attributes (&decl
, attributes
, flags
);
5013 /* Dllimported symbols cannot be defined. Static data members (which
5014 can be initialized in-class and dllimported) go through grokfield,
5015 not here, so we don't need to exclude those decls when checking for
5017 if (initialized
&& DECL_DLLIMPORT_P (decl
))
5019 error ("definition of %q#D is marked %<dllimport%>", decl
);
5020 DECL_DLLIMPORT_P (decl
) = 0;
5023 /* If #pragma weak was used, mark the decl weak now. */
5024 if (!processing_template_decl
)
5025 maybe_apply_pragma_weak (decl
);
5027 if (TREE_CODE (decl
) == FUNCTION_DECL
5028 && DECL_DECLARED_INLINE_P (decl
)
5029 && DECL_UNINLINABLE (decl
)
5030 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl
)))
5031 warning_at (DECL_SOURCE_LOCATION (decl
), 0,
5032 "inline function %qD given attribute noinline", decl
);
5034 if (TYPE_P (context
) && COMPLETE_TYPE_P (complete_type (context
)))
5036 bool this_tmpl
= (processing_template_decl
5037 > template_class_depth (context
));
5040 tree field
= lookup_field (context
, DECL_NAME (decl
), 0, false);
5041 if (field
== NULL_TREE
5042 || !(VAR_P (field
) || variable_template_p (field
)))
5043 error ("%q+#D is not a static data member of %q#T", decl
, context
);
5044 else if (variable_template_p (field
) && !this_tmpl
)
5046 if (DECL_LANG_SPECIFIC (decl
)
5047 && DECL_TEMPLATE_SPECIALIZATION (decl
))
5048 /* OK, specialization was already checked. */;
5051 error_at (DECL_SOURCE_LOCATION (decl
),
5052 "non-member-template declaration of %qD", decl
);
5053 inform (DECL_SOURCE_LOCATION (field
), "does not match "
5054 "member template declaration here");
5055 return error_mark_node
;
5060 if (variable_template_p (field
))
5061 field
= DECL_TEMPLATE_RESULT (field
);
5063 if (DECL_CONTEXT (field
) != context
)
5065 if (!same_type_p (DECL_CONTEXT (field
), context
))
5066 permerror (input_location
, "ISO C++ does not permit %<%T::%D%> "
5067 "to be defined as %<%T::%D%>",
5068 DECL_CONTEXT (field
), DECL_NAME (decl
),
5069 context
, DECL_NAME (decl
));
5070 DECL_CONTEXT (decl
) = DECL_CONTEXT (field
);
5072 /* Static data member are tricky; an in-class initialization
5073 still doesn't provide a definition, so the in-class
5074 declaration will have DECL_EXTERNAL set, but will have an
5075 initialization. Thus, duplicate_decls won't warn
5076 about this situation, and so we check here. */
5077 if (initialized
&& DECL_INITIALIZED_IN_CLASS_P (field
))
5078 error ("duplicate initialization of %qD", decl
);
5079 if (duplicate_decls (decl
, field
, /*newdecl_is_friend=*/false))
5081 if (decl_spec_seq_has_spec_p (declspecs
, ds_constexpr
)
5082 && !DECL_DECLARED_CONSTEXPR_P (field
))
5083 error ("%qD declared %<constexpr%> outside its class", field
);
5088 tree field
= check_classfn (context
, decl
,
5090 ? current_template_parms
5092 if (field
&& field
!= error_mark_node
5093 && duplicate_decls (decl
, field
,
5094 /*newdecl_is_friend=*/false))
5098 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
5099 DECL_IN_AGGR_P (decl
) = 0;
5100 /* Do not mark DECL as an explicit specialization if it was not
5101 already marked as an instantiation; a declaration should
5102 never be marked as a specialization unless we know what
5103 template is being specialized. */
5104 if (DECL_LANG_SPECIFIC (decl
) && DECL_USE_TEMPLATE (decl
))
5106 SET_DECL_TEMPLATE_SPECIALIZATION (decl
);
5107 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5108 DECL_COMDAT (decl
) = (TREE_PUBLIC (decl
)
5109 && DECL_DECLARED_INLINE_P (decl
));
5111 DECL_COMDAT (decl
) = false;
5113 /* [temp.expl.spec] An explicit specialization of a static data
5114 member of a template is a definition if the declaration
5115 includes an initializer; otherwise, it is a declaration.
5117 We check for processing_specialization so this only applies
5118 to the new specialization syntax. */
5119 if (!initialized
&& processing_specialization
)
5120 DECL_EXTERNAL (decl
) = 1;
5123 if (DECL_EXTERNAL (decl
) && ! DECL_TEMPLATE_SPECIALIZATION (decl
)
5124 /* Aliases are definitions. */
5126 permerror (input_location
, "declaration of %q#D outside of class is not definition",
5130 was_public
= TREE_PUBLIC (decl
);
5132 /* Enter this declaration into the symbol table. Don't push the plain
5133 VAR_DECL for a variable template. */
5134 if (!template_parm_scope_p ()
5136 decl
= maybe_push_decl (decl
);
5138 if (processing_template_decl
)
5139 decl
= push_template_decl (decl
);
5140 if (decl
== error_mark_node
)
5141 return error_mark_node
;
5144 && DECL_NAMESPACE_SCOPE_P (decl
) && !TREE_PUBLIC (decl
) && !was_public
5145 && !DECL_THIS_STATIC (decl
) && !DECL_ARTIFICIAL (decl
))
5147 /* This is a const variable with implicit 'static'. Set
5148 DECL_THIS_STATIC so we can tell it from variables that are
5149 !TREE_PUBLIC because of the anonymous namespace. */
5150 gcc_assert (CP_TYPE_CONST_P (TREE_TYPE (decl
)) || errorcount
);
5151 DECL_THIS_STATIC (decl
) = 1;
5154 if (current_function_decl
&& VAR_P (decl
)
5155 && DECL_DECLARED_CONSTEXPR_P (current_function_decl
))
5158 if (CP_DECL_THREAD_LOCAL_P (decl
))
5159 error ("%qD declared %<thread_local%> in %<constexpr%> function",
5161 else if (TREE_STATIC (decl
))
5162 error ("%qD declared %<static%> in %<constexpr%> function", decl
);
5166 cp_function_chain
->invalid_constexpr
= true;
5169 if (!processing_template_decl
&& VAR_P (decl
))
5170 start_decl_1 (decl
, initialized
);
5175 /* Process the declaration of a variable DECL. INITIALIZED is true
5176 iff DECL is explicitly initialized. (INITIALIZED is false if the
5177 variable is initialized via an implicitly-called constructor.)
5178 This function must be called for ordinary variables (including, for
5179 example, implicit instantiations of templates), but must not be
5180 called for template declarations. */
5183 start_decl_1 (tree decl
, bool initialized
)
5187 bool aggregate_definition_p
;
5189 gcc_assert (!processing_template_decl
);
5191 if (error_operand_p (decl
))
5194 gcc_assert (VAR_P (decl
));
5196 type
= TREE_TYPE (decl
);
5197 complete_p
= COMPLETE_TYPE_P (type
);
5198 aggregate_definition_p
= MAYBE_CLASS_TYPE_P (type
) && !DECL_EXTERNAL (decl
);
5200 /* If an explicit initializer is present, or if this is a definition
5201 of an aggregate, then we need a complete type at this point.
5202 (Scalars are always complete types, so there is nothing to
5203 check.) This code just sets COMPLETE_P; errors (if necessary)
5204 are issued below. */
5205 if ((initialized
|| aggregate_definition_p
)
5207 && COMPLETE_TYPE_P (complete_type (type
)))
5210 /* We will not yet have set TREE_READONLY on DECL if the type
5211 was "const", but incomplete, before this point. But, now, we
5212 have a complete type, so we can try again. */
5213 cp_apply_type_quals_to_decl (cp_type_quals (type
), decl
);
5217 /* Is it valid for this decl to have an initializer at all? */
5219 /* Don't allow initializations for incomplete types except for
5220 arrays which might be completed by the initialization. */
5222 ; /* A complete type is ok. */
5223 else if (type_uses_auto (type
))
5224 ; /* An auto type is ok. */
5225 else if (TREE_CODE (type
) != ARRAY_TYPE
)
5227 error ("variable %q#D has initializer but incomplete type", decl
);
5228 type
= TREE_TYPE (decl
) = error_mark_node
;
5230 else if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type
))))
5232 if (DECL_LANG_SPECIFIC (decl
) && DECL_TEMPLATE_INFO (decl
))
5233 error ("elements of array %q#D have incomplete type", decl
);
5234 /* else we already gave an error in start_decl. */
5237 else if (aggregate_definition_p
&& !complete_p
)
5239 if (type_uses_auto (type
))
5242 error ("aggregate %q#D has incomplete type and cannot be defined",
5244 /* Change the type so that assemble_variable will give
5245 DECL an rtl we can live with: (mem (const_int 0)). */
5246 type
= TREE_TYPE (decl
) = error_mark_node
;
5249 /* Create a new scope to hold this declaration if necessary.
5250 Whether or not a new scope is necessary cannot be determined
5251 until after the type has been completed; if the type is a
5252 specialization of a class template it is not until after
5253 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
5254 will be set correctly. */
5255 maybe_push_cleanup_level (type
);
5258 /* Handle initialization of references. DECL, TYPE, and INIT have the
5259 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
5260 but will be set to a new CLEANUP_STMT if a temporary is created
5261 that must be destroyed subsequently.
5263 Returns an initializer expression to use to initialize DECL, or
5264 NULL if the initialization can be performed statically.
5266 Quotes on semantics can be found in ARM 8.4.3. */
5269 grok_reference_init (tree decl
, tree type
, tree init
, int flags
)
5271 if (init
== NULL_TREE
)
5273 if ((DECL_LANG_SPECIFIC (decl
) == 0
5274 || DECL_IN_AGGR_P (decl
) == 0)
5275 && ! DECL_THIS_EXTERN (decl
))
5276 error ("%qD declared as reference but not initialized", decl
);
5280 if (TREE_CODE (init
) == TREE_LIST
)
5281 init
= build_x_compound_expr_from_list (init
, ELK_INIT
,
5282 tf_warning_or_error
);
5284 tree ttype
= TREE_TYPE (type
);
5285 if (TREE_CODE (ttype
) != ARRAY_TYPE
5286 && TREE_CODE (TREE_TYPE (init
)) == ARRAY_TYPE
)
5287 /* Note: default conversion is only called in very special cases. */
5288 init
= decay_conversion (init
, tf_warning_or_error
);
5290 /* check_initializer handles this for non-reference variables, but for
5291 references we need to do it here or the initializer will get the
5292 incomplete array type and confuse later calls to
5293 cp_complete_array_type. */
5294 if (TREE_CODE (ttype
) == ARRAY_TYPE
5295 && TYPE_DOMAIN (ttype
) == NULL_TREE
5296 && (BRACE_ENCLOSED_INITIALIZER_P (init
)
5297 || TREE_CODE (init
) == STRING_CST
))
5299 cp_complete_array_type (&ttype
, init
, false);
5300 if (ttype
!= TREE_TYPE (type
))
5301 type
= cp_build_reference_type (ttype
, TYPE_REF_IS_RVALUE (type
));
5304 /* Convert INIT to the reference type TYPE. This may involve the
5305 creation of a temporary, whose lifetime must be the same as that
5306 of the reference. If so, a DECL_EXPR for the temporary will be
5307 added just after the DECL_EXPR for DECL. That's why we don't set
5308 DECL_INITIAL for local references (instead assigning to them
5309 explicitly); we need to allow the temporary to be initialized
5311 return initialize_reference (type
, init
, flags
,
5312 tf_warning_or_error
);
5315 /* Designated initializers in arrays are not supported in GNU C++.
5316 The parser cannot detect this error since it does not know whether
5317 a given brace-enclosed initializer is for a class type or for an
5318 array. This function checks that CE does not use a designated
5319 initializer. If it does, an error is issued. Returns true if CE
5320 is valid, i.e., does not have a designated initializer. */
5323 check_array_designated_initializer (constructor_elt
*ce
,
5324 unsigned HOST_WIDE_INT index
)
5326 /* Designated initializers for array elements are not supported. */
5329 /* The parser only allows identifiers as designated
5331 if (ce
->index
== error_mark_node
)
5333 error ("name used in a GNU-style designated "
5334 "initializer for an array");
5337 else if (identifier_p (ce
->index
))
5339 error ("name %qD used in a GNU-style designated "
5340 "initializer for an array", ce
->index
);
5344 tree ce_index
= build_expr_type_conversion (WANT_INT
| WANT_ENUM
,
5347 && INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (ce_index
))
5348 && (TREE_CODE (ce_index
= maybe_constant_value (ce_index
))
5351 /* A C99 designator is OK if it matches the current index. */
5352 if (wi::eq_p (ce_index
, index
))
5355 sorry ("non-trivial designated initializers not supported");
5358 error ("C99 designator %qE is not an integral constant-expression",
5367 /* When parsing `int a[] = {1, 2};' we don't know the size of the
5368 array until we finish parsing the initializer. If that's the
5369 situation we're in, update DECL accordingly. */
5372 maybe_deduce_size_from_array_init (tree decl
, tree init
)
5374 tree type
= TREE_TYPE (decl
);
5376 if (TREE_CODE (type
) == ARRAY_TYPE
5377 && TYPE_DOMAIN (type
) == NULL_TREE
5378 && TREE_CODE (decl
) != TYPE_DECL
)
5380 /* do_default is really a C-ism to deal with tentative definitions.
5381 But let's leave it here to ease the eventual merge. */
5382 int do_default
= !DECL_EXTERNAL (decl
);
5383 tree initializer
= init
? init
: DECL_INITIAL (decl
);
5386 /* Check that there are no designated initializers in INIT, as
5387 those are not supported in GNU C++, and as the middle-end
5388 will crash if presented with a non-numeric designated
5390 if (initializer
&& BRACE_ENCLOSED_INITIALIZER_P (initializer
))
5392 vec
<constructor_elt
, va_gc
> *v
= CONSTRUCTOR_ELTS (initializer
);
5393 constructor_elt
*ce
;
5395 FOR_EACH_VEC_SAFE_ELT (v
, i
, ce
)
5396 if (!check_array_designated_initializer (ce
, i
))
5402 failure
= cp_complete_array_type (&TREE_TYPE (decl
), initializer
,
5406 error_at (EXPR_LOC_OR_LOC (initializer
,
5407 DECL_SOURCE_LOCATION (decl
)),
5408 "initializer fails to determine size of %qD", decl
);
5410 else if (failure
== 2)
5414 error_at (DECL_SOURCE_LOCATION (decl
),
5415 "array size missing in %qD", decl
);
5417 /* If a `static' var's size isn't known, make it extern as
5418 well as static, so it does not get allocated. If it's not
5419 `static', then don't mark it extern; finish_incomplete_decl
5420 will give it a default size and it will get allocated. */
5421 else if (!pedantic
&& TREE_STATIC (decl
) && !TREE_PUBLIC (decl
))
5422 DECL_EXTERNAL (decl
) = 1;
5424 else if (failure
== 3)
5426 error_at (DECL_SOURCE_LOCATION (decl
),
5427 "zero-size array %qD", decl
);
5431 cp_apply_type_quals_to_decl (cp_type_quals (TREE_TYPE (decl
)), decl
);
5433 relayout_decl (decl
);
5437 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
5438 any appropriate error messages regarding the layout. */
5441 layout_var_decl (tree decl
)
5445 type
= TREE_TYPE (decl
);
5446 if (type
== error_mark_node
)
5449 /* If we haven't already laid out this declaration, do so now.
5450 Note that we must not call complete type for an external object
5451 because it's type might involve templates that we are not
5452 supposed to instantiate yet. (And it's perfectly valid to say
5453 `extern X x' for some incomplete type `X'.) */
5454 if (!DECL_EXTERNAL (decl
))
5455 complete_type (type
);
5456 if (!DECL_SIZE (decl
)
5457 && TREE_TYPE (decl
) != error_mark_node
5458 && complete_or_array_type_p (type
))
5459 layout_decl (decl
, 0);
5461 if (!DECL_EXTERNAL (decl
) && DECL_SIZE (decl
) == NULL_TREE
)
5463 /* An automatic variable with an incomplete type: that is an error.
5464 Don't talk about array types here, since we took care of that
5465 message in grokdeclarator. */
5466 error_at (DECL_SOURCE_LOCATION (decl
),
5467 "storage size of %qD isn%'t known", decl
);
5468 TREE_TYPE (decl
) = error_mark_node
;
5471 /* Keep this code around in case we later want to control debug info
5472 based on whether a type is "used". (jason 1999-11-11) */
5474 else if (!DECL_EXTERNAL (decl
) && MAYBE_CLASS_TYPE_P (ttype
))
5475 /* Let debugger know it should output info for this type. */
5476 note_debug_info_needed (ttype
);
5478 if (TREE_STATIC (decl
) && DECL_CLASS_SCOPE_P (decl
))
5479 note_debug_info_needed (DECL_CONTEXT (decl
));
5482 if ((DECL_EXTERNAL (decl
) || TREE_STATIC (decl
))
5483 && DECL_SIZE (decl
) != NULL_TREE
5484 && ! TREE_CONSTANT (DECL_SIZE (decl
)))
5486 if (TREE_CODE (DECL_SIZE (decl
)) == INTEGER_CST
)
5487 constant_expression_warning (DECL_SIZE (decl
));
5490 error_at (DECL_SOURCE_LOCATION (decl
),
5491 "storage size of %qD isn%'t constant", decl
);
5492 TREE_TYPE (decl
) = error_mark_node
;
5497 /* If a local static variable is declared in an inline function, or if
5498 we have a weak definition, we must endeavor to create only one
5499 instance of the variable at link-time. */
5502 maybe_commonize_var (tree decl
)
5504 /* Static data in a function with comdat linkage also has comdat
5506 if ((TREE_STATIC (decl
)
5507 /* Don't mess with __FUNCTION__. */
5508 && ! DECL_ARTIFICIAL (decl
)
5509 && DECL_FUNCTION_SCOPE_P (decl
)
5510 && vague_linkage_p (DECL_CONTEXT (decl
)))
5511 || (TREE_PUBLIC (decl
) && DECL_INLINE_VAR_P (decl
)))
5515 /* With weak symbols, we simply make the variable COMDAT;
5516 that will cause copies in multiple translations units to
5518 comdat_linkage (decl
);
5522 if (DECL_INITIAL (decl
) == NULL_TREE
5523 || DECL_INITIAL (decl
) == error_mark_node
)
5525 /* Without weak symbols, we can use COMMON to merge
5526 uninitialized variables. */
5527 TREE_PUBLIC (decl
) = 1;
5528 DECL_COMMON (decl
) = 1;
5532 /* While for initialized variables, we must use internal
5533 linkage -- which means that multiple copies will not
5535 TREE_PUBLIC (decl
) = 0;
5536 DECL_COMMON (decl
) = 0;
5538 if (DECL_INLINE_VAR_P (decl
))
5539 msg
= G_("sorry: semantics of inline variable "
5540 "%q#D are wrong (you%'ll wind up with "
5541 "multiple copies)");
5543 msg
= G_("sorry: semantics of inline function "
5544 "static data %q#D are wrong (you%'ll wind "
5545 "up with multiple copies)");
5546 if (warning_at (DECL_SOURCE_LOCATION (decl
), 0,
5548 inform (DECL_SOURCE_LOCATION (decl
),
5549 "you can work around this by removing the initializer");
5555 /* Issue an error message if DECL is an uninitialized const variable. */
5558 check_for_uninitialized_const_var (tree decl
)
5560 tree type
= strip_array_types (TREE_TYPE (decl
));
5562 /* ``Unless explicitly declared extern, a const object does not have
5563 external linkage and must be initialized. ($8.4; $12.1)'' ARM
5566 && TREE_CODE (type
) != REFERENCE_TYPE
5567 && (CP_TYPE_CONST_P (type
) || var_in_constexpr_fn (decl
))
5568 && !DECL_INITIAL (decl
))
5570 tree field
= default_init_uninitialized_part (type
);
5574 if (CP_TYPE_CONST_P (type
))
5575 permerror (DECL_SOURCE_LOCATION (decl
),
5576 "uninitialized const %qD", decl
);
5579 error_at (DECL_SOURCE_LOCATION (decl
),
5580 "uninitialized variable %qD in %<constexpr%> function",
5582 cp_function_chain
->invalid_constexpr
= true;
5585 if (CLASS_TYPE_P (type
))
5587 tree defaulted_ctor
;
5589 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (type
)),
5590 "%q#T has no user-provided default constructor", type
);
5591 defaulted_ctor
= in_class_defaulted_default_constructor (type
);
5593 inform (DECL_SOURCE_LOCATION (defaulted_ctor
),
5594 "constructor is not user-provided because it is "
5595 "explicitly defaulted in the class body");
5596 inform (DECL_SOURCE_LOCATION (field
),
5597 "and the implicitly-defined constructor does not "
5598 "initialize %q#D", field
);
5603 /* Structure holding the current initializer being processed by reshape_init.
5604 CUR is a pointer to the current element being processed, END is a pointer
5605 after the last element present in the initializer. */
5608 constructor_elt
*cur
;
5609 constructor_elt
*end
;
5612 static tree
reshape_init_r (tree
, reshape_iter
*, bool, tsubst_flags_t
);
5614 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
5615 returned is the next FIELD_DECL (possibly FIELD itself) that can be
5616 initialized. If there are no more such fields, the return value
5620 next_initializable_field (tree field
)
5623 && (TREE_CODE (field
) != FIELD_DECL
5624 || (DECL_C_BIT_FIELD (field
) && !DECL_NAME (field
))
5625 || (DECL_ARTIFICIAL (field
)
5626 && !(cxx_dialect
>= cxx1z
&& DECL_FIELD_IS_BASE (field
)))))
5627 field
= DECL_CHAIN (field
);
5632 /* Return true for [dcl.init.list] direct-list-initialization from
5633 single element of enumeration with a fixed underlying type. */
5636 is_direct_enum_init (tree type
, tree init
)
5638 if (cxx_dialect
>= cxx1z
5639 && TREE_CODE (type
) == ENUMERAL_TYPE
5640 && ENUM_FIXED_UNDERLYING_TYPE_P (type
)
5641 && TREE_CODE (init
) == CONSTRUCTOR
5642 && CONSTRUCTOR_IS_DIRECT_INIT (init
)
5643 && CONSTRUCTOR_NELTS (init
) == 1)
5648 /* Subroutine of reshape_init_array and reshape_init_vector, which does
5649 the actual work. ELT_TYPE is the element type of the array. MAX_INDEX is an
5650 INTEGER_CST representing the size of the array minus one (the maximum index),
5651 or NULL_TREE if the array was declared without specifying the size. D is
5652 the iterator within the constructor. */
5655 reshape_init_array_1 (tree elt_type
, tree max_index
, reshape_iter
*d
,
5656 tsubst_flags_t complain
)
5659 bool sized_array_p
= (max_index
&& TREE_CONSTANT (max_index
));
5660 unsigned HOST_WIDE_INT max_index_cst
= 0;
5661 unsigned HOST_WIDE_INT index
;
5663 /* The initializer for an array is always a CONSTRUCTOR. */
5664 new_init
= build_constructor (init_list_type_node
, NULL
);
5668 /* Minus 1 is used for zero sized arrays. */
5669 if (integer_all_onesp (max_index
))
5672 if (tree_fits_uhwi_p (max_index
))
5673 max_index_cst
= tree_to_uhwi (max_index
);
5674 /* sizetype is sign extended, not zero extended. */
5676 max_index_cst
= tree_to_uhwi (fold_convert (size_type_node
, max_index
));
5679 /* Loop until there are no more initializers. */
5681 d
->cur
!= d
->end
&& (!sized_array_p
|| index
<= max_index_cst
);
5685 constructor_elt
*old_cur
= d
->cur
;
5687 check_array_designated_initializer (d
->cur
, index
);
5688 elt_init
= reshape_init_r (elt_type
, d
, /*first_initializer_p=*/false,
5690 if (elt_init
== error_mark_node
)
5691 return error_mark_node
;
5692 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init
),
5693 size_int (index
), elt_init
);
5694 if (!TREE_CONSTANT (elt_init
))
5695 TREE_CONSTANT (new_init
) = false;
5697 /* This can happen with an invalid initializer (c++/54501). */
5698 if (d
->cur
== old_cur
&& !sized_array_p
)
5705 /* Subroutine of reshape_init_r, processes the initializers for arrays.
5706 Parameters are the same of reshape_init_r. */
5709 reshape_init_array (tree type
, reshape_iter
*d
, tsubst_flags_t complain
)
5711 tree max_index
= NULL_TREE
;
5713 gcc_assert (TREE_CODE (type
) == ARRAY_TYPE
);
5715 if (TYPE_DOMAIN (type
))
5716 max_index
= array_type_nelts (type
);
5718 return reshape_init_array_1 (TREE_TYPE (type
), max_index
, d
, complain
);
5721 /* Subroutine of reshape_init_r, processes the initializers for vectors.
5722 Parameters are the same of reshape_init_r. */
5725 reshape_init_vector (tree type
, reshape_iter
*d
, tsubst_flags_t complain
)
5727 tree max_index
= NULL_TREE
;
5729 gcc_assert (VECTOR_TYPE_P (type
));
5731 if (COMPOUND_LITERAL_P (d
->cur
->value
))
5733 tree value
= d
->cur
->value
;
5734 if (!same_type_p (TREE_TYPE (value
), type
))
5736 if (complain
& tf_error
)
5737 error ("invalid type %qT as initializer for a vector of type %qT",
5738 TREE_TYPE (d
->cur
->value
), type
);
5739 value
= error_mark_node
;
5745 /* For a vector, we initialize it as an array of the appropriate size. */
5746 if (VECTOR_TYPE_P (type
))
5747 max_index
= size_int (TYPE_VECTOR_SUBPARTS (type
) - 1);
5749 return reshape_init_array_1 (TREE_TYPE (type
), max_index
, d
, complain
);
5752 /* Subroutine of reshape_init_r, processes the initializers for classes
5753 or union. Parameters are the same of reshape_init_r. */
5756 reshape_init_class (tree type
, reshape_iter
*d
, bool first_initializer_p
,
5757 tsubst_flags_t complain
)
5762 gcc_assert (CLASS_TYPE_P (type
));
5764 /* The initializer for a class is always a CONSTRUCTOR. */
5765 new_init
= build_constructor (init_list_type_node
, NULL
);
5766 field
= next_initializable_field (TYPE_FIELDS (type
));
5772 An initializer for an aggregate member that is an
5773 empty class shall have the form of an empty
5774 initializer-list {}. */
5775 if (!first_initializer_p
)
5777 if (complain
& tf_error
)
5778 error ("initializer for %qT must be brace-enclosed", type
);
5779 return error_mark_node
;
5784 /* Loop through the initializable fields, gathering initializers. */
5785 while (d
->cur
!= d
->end
)
5788 constructor_elt
*old_cur
= d
->cur
;
5790 /* Handle designated initializers, as an extension. */
5793 if (d
->cur
->index
== error_mark_node
)
5794 return error_mark_node
;
5796 if (TREE_CODE (d
->cur
->index
) == FIELD_DECL
)
5797 /* We already reshaped this. */
5798 gcc_assert (d
->cur
->index
== field
);
5799 else if (TREE_CODE (d
->cur
->index
) == IDENTIFIER_NODE
)
5800 field
= lookup_field_1 (type
, d
->cur
->index
, /*want_type=*/false);
5803 if (complain
& tf_error
)
5804 error ("%<[%E] =%> used in a GNU-style designated initializer"
5805 " for class %qT", d
->cur
->index
, type
);
5806 return error_mark_node
;
5809 if (!field
|| TREE_CODE (field
) != FIELD_DECL
)
5811 if (complain
& tf_error
)
5812 error ("%qT has no non-static data member named %qD", type
,
5814 return error_mark_node
;
5818 /* If we processed all the member of the class, we are done. */
5822 field_init
= reshape_init_r (TREE_TYPE (field
), d
,
5823 /*first_initializer_p=*/false, complain
);
5824 if (field_init
== error_mark_node
)
5825 return error_mark_node
;
5827 if (d
->cur
== old_cur
&& d
->cur
->index
)
5829 /* This can happen with an invalid initializer for a flexible
5830 array member (c++/54441). */
5831 if (complain
& tf_error
)
5832 error ("invalid initializer for %q#D", field
);
5833 return error_mark_node
;
5836 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init
), field
, field_init
);
5840 When a union is initialized with a brace-enclosed
5841 initializer, the braces shall only contain an
5842 initializer for the first member of the union. */
5843 if (TREE_CODE (type
) == UNION_TYPE
)
5846 field
= next_initializable_field (DECL_CHAIN (field
));
5852 /* Subroutine of reshape_init_r. We're in a context where C99 initializer
5853 designators are not valid; either complain or return true to indicate
5854 that reshape_init_r should return error_mark_node. */
5857 has_designator_problem (reshape_iter
*d
, tsubst_flags_t complain
)
5861 if (complain
& tf_error
)
5862 error ("C99 designator %qE outside aggregate initializer",
5870 /* Subroutine of reshape_init, which processes a single initializer (part of
5871 a CONSTRUCTOR). TYPE is the type of the variable being initialized, D is the
5872 iterator within the CONSTRUCTOR which points to the initializer to process.
5873 FIRST_INITIALIZER_P is true if this is the first initializer of the
5874 outermost CONSTRUCTOR node. */
5877 reshape_init_r (tree type
, reshape_iter
*d
, bool first_initializer_p
,
5878 tsubst_flags_t complain
)
5880 tree init
= d
->cur
->value
;
5882 if (error_operand_p (init
))
5883 return error_mark_node
;
5885 if (first_initializer_p
&& !CP_AGGREGATE_TYPE_P (type
)
5886 && has_designator_problem (d
, complain
))
5887 return error_mark_node
;
5889 if (TREE_CODE (type
) == COMPLEX_TYPE
)
5891 /* A complex type can be initialized from one or two initializers,
5892 but braces are not elided. */
5894 if (BRACE_ENCLOSED_INITIALIZER_P (init
))
5896 if (CONSTRUCTOR_NELTS (init
) > 2)
5898 if (complain
& tf_error
)
5899 error ("too many initializers for %qT", type
);
5901 return error_mark_node
;
5904 else if (first_initializer_p
&& d
->cur
!= d
->end
)
5906 vec
<constructor_elt
, va_gc
> *v
= 0;
5907 CONSTRUCTOR_APPEND_ELT (v
, NULL_TREE
, init
);
5908 CONSTRUCTOR_APPEND_ELT (v
, NULL_TREE
, d
->cur
->value
);
5909 if (has_designator_problem (d
, complain
))
5910 return error_mark_node
;
5912 init
= build_constructor (init_list_type_node
, v
);
5917 /* A non-aggregate type is always initialized with a single
5919 if (!CP_AGGREGATE_TYPE_P (type
))
5921 /* It is invalid to initialize a non-aggregate type with a
5922 brace-enclosed initializer before C++0x.
5923 We need to check for BRACE_ENCLOSED_INITIALIZER_P here because
5924 of g++.old-deja/g++.mike/p7626.C: a pointer-to-member constant is
5925 a CONSTRUCTOR (with a record type). */
5926 if (TREE_CODE (init
) == CONSTRUCTOR
5927 /* Don't complain about a capture-init. */
5928 && !CONSTRUCTOR_IS_DIRECT_INIT (init
)
5929 && BRACE_ENCLOSED_INITIALIZER_P (init
)) /* p7626.C */
5931 if (SCALAR_TYPE_P (type
))
5933 if (cxx_dialect
< cxx11
5934 /* Isn't value-initialization. */
5935 || CONSTRUCTOR_NELTS (init
) > 0)
5937 if (complain
& tf_error
)
5938 error ("braces around scalar initializer for type %qT",
5940 init
= error_mark_node
;
5944 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS
);
5951 /* "If T is a class type and the initializer list has a single element of
5952 type cv U, where U is T or a class derived from T, the object is
5953 initialized from that element." Even if T is an aggregate. */
5954 if (cxx_dialect
>= cxx11
&& (CLASS_TYPE_P (type
) || VECTOR_TYPE_P (type
))
5955 && first_initializer_p
5956 && d
->end
- d
->cur
== 1
5957 && reference_related_p (type
, TREE_TYPE (init
)))
5965 All implicit type conversions (clause _conv_) are considered when
5966 initializing the aggregate member with an initializer from an
5967 initializer-list. If the initializer can initialize a member,
5968 the member is initialized. Otherwise, if the member is itself a
5969 non-empty subaggregate, brace elision is assumed and the
5970 initializer is considered for the initialization of the first
5971 member of the subaggregate. */
5972 if (TREE_CODE (init
) != CONSTRUCTOR
5973 /* But don't try this for the first initializer, since that would be
5974 looking through the outermost braces; A a2 = { a1 }; is not a
5975 valid aggregate initialization. */
5976 && !first_initializer_p
5977 && (same_type_ignoring_top_level_qualifiers_p (type
, TREE_TYPE (init
))
5978 || can_convert_arg (type
, TREE_TYPE (init
), init
, LOOKUP_NORMAL
,
5985 /* [dcl.init.string]
5987 A char array (whether plain char, signed char, or unsigned char)
5988 can be initialized by a string-literal (optionally enclosed in
5989 braces); a wchar_t array can be initialized by a wide
5990 string-literal (optionally enclosed in braces). */
5991 if (TREE_CODE (type
) == ARRAY_TYPE
5992 && char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (type
))))
5994 tree str_init
= init
;
5996 /* Strip one level of braces if and only if they enclose a single
5997 element (as allowed by [dcl.init.string]). */
5998 if (!first_initializer_p
5999 && TREE_CODE (str_init
) == CONSTRUCTOR
6000 && CONSTRUCTOR_NELTS (str_init
) == 1)
6002 str_init
= (*CONSTRUCTOR_ELTS (str_init
))[0].value
;
6005 /* If it's a string literal, then it's the initializer for the array
6006 as a whole. Otherwise, continue with normal initialization for
6007 array types (one value per array element). */
6008 if (TREE_CODE (str_init
) == STRING_CST
)
6010 if (has_designator_problem (d
, complain
))
6011 return error_mark_node
;
6017 /* The following cases are about aggregates. If we are not within a full
6018 initializer already, and there is not a CONSTRUCTOR, it means that there
6019 is a missing set of braces (that is, we are processing the case for
6020 which reshape_init exists). */
6021 if (!first_initializer_p
)
6023 if (TREE_CODE (init
) == CONSTRUCTOR
)
6025 if (TREE_TYPE (init
) && TYPE_PTRMEMFUNC_P (TREE_TYPE (init
)))
6026 /* There is no need to reshape pointer-to-member function
6027 initializers, as they are always constructed correctly
6028 by the front end. */
6030 else if (COMPOUND_LITERAL_P (init
))
6031 /* For a nested compound literal, there is no need to reshape since
6032 brace elision is not allowed. Even if we decided to allow it,
6033 we should add a call to reshape_init in finish_compound_literal,
6034 before calling digest_init, so changing this code would still
6035 not be necessary. */
6036 gcc_assert (!BRACE_ENCLOSED_INITIALIZER_P (init
));
6040 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init
));
6041 return reshape_init (type
, init
, complain
);
6045 if (complain
& tf_warning
)
6046 warning (OPT_Wmissing_braces
,
6047 "missing braces around initializer for %qT",
6051 /* Dispatch to specialized routines. */
6052 if (CLASS_TYPE_P (type
))
6053 return reshape_init_class (type
, d
, first_initializer_p
, complain
);
6054 else if (TREE_CODE (type
) == ARRAY_TYPE
)
6055 return reshape_init_array (type
, d
, complain
);
6056 else if (VECTOR_TYPE_P (type
))
6057 return reshape_init_vector (type
, d
, complain
);
6062 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
6063 brace-enclosed aggregate initializer.
6065 INIT is the CONSTRUCTOR containing the list of initializers describing
6066 a brace-enclosed initializer for an entity of the indicated aggregate TYPE.
6067 It may not presently match the shape of the TYPE; for example:
6069 struct S { int a; int b; };
6070 struct S a[] = { 1, 2, 3, 4 };
6072 Here INIT will hold a vector of four elements, rather than a
6073 vector of two elements, each itself a vector of two elements. This
6074 routine transforms INIT from the former form into the latter. The
6075 revised CONSTRUCTOR node is returned. */
6078 reshape_init (tree type
, tree init
, tsubst_flags_t complain
)
6080 vec
<constructor_elt
, va_gc
> *v
;
6084 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init
));
6086 v
= CONSTRUCTOR_ELTS (init
);
6088 /* An empty constructor does not need reshaping, and it is always a valid
6090 if (vec_safe_is_empty (v
))
6093 /* Handle [dcl.init.list] direct-list-initialization from
6094 single element of enumeration with a fixed underlying type. */
6095 if (is_direct_enum_init (type
, init
))
6097 tree elt
= CONSTRUCTOR_ELT (init
, 0)->value
;
6098 if (check_narrowing (ENUM_UNDERLYING_TYPE (type
), elt
, complain
))
6099 return cp_build_c_cast (type
, elt
, tf_warning_or_error
);
6101 return error_mark_node
;
6104 /* Recurse on this CONSTRUCTOR. */
6106 d
.end
= d
.cur
+ v
->length ();
6108 new_init
= reshape_init_r (type
, &d
, true, complain
);
6109 if (new_init
== error_mark_node
)
6110 return error_mark_node
;
6112 /* Make sure all the element of the constructor were used. Otherwise,
6113 issue an error about exceeding initializers. */
6116 if (complain
& tf_error
)
6117 error ("too many initializers for %qT", type
);
6119 return error_mark_node
;
6122 if (CONSTRUCTOR_IS_DIRECT_INIT (init
)
6123 && BRACE_ENCLOSED_INITIALIZER_P (new_init
))
6124 CONSTRUCTOR_IS_DIRECT_INIT (new_init
) = true;
6129 /* Verify array initializer. Returns true if errors have been reported. */
6132 check_array_initializer (tree decl
, tree type
, tree init
)
6134 tree element_type
= TREE_TYPE (type
);
6136 /* The array type itself need not be complete, because the
6137 initializer may tell us how many elements are in the array.
6138 But, the elements of the array must be complete. */
6139 if (!COMPLETE_TYPE_P (complete_type (element_type
)))
6142 error_at (DECL_SOURCE_LOCATION (decl
),
6143 "elements of array %q#D have incomplete type", decl
);
6145 error ("elements of array %q#T have incomplete type", type
);
6148 /* A compound literal can't have variable size. */
6150 && ((COMPLETE_TYPE_P (type
) && !TREE_CONSTANT (TYPE_SIZE (type
)))
6151 || !TREE_CONSTANT (TYPE_SIZE (element_type
))))
6153 error ("variable-sized compound literal");
6159 /* Subroutine of check_initializer; args are passed down from that function.
6160 Set stmts_are_full_exprs_p to 1 across a call to build_aggr_init. */
6163 build_aggr_init_full_exprs (tree decl
, tree init
, int flags
)
6166 gcc_assert (stmts_are_full_exprs_p ());
6167 return build_aggr_init (decl
, init
, flags
, tf_warning_or_error
);
6170 /* Verify INIT (the initializer for DECL), and record the
6171 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
6172 grok_reference_init.
6174 If the return value is non-NULL, it is an expression that must be
6175 evaluated dynamically to initialize DECL. */
6178 check_initializer (tree decl
, tree init
, int flags
, vec
<tree
, va_gc
> **cleanups
)
6180 tree type
= TREE_TYPE (decl
);
6181 tree init_code
= NULL
;
6184 /* Things that are going to be initialized need to have complete
6186 TREE_TYPE (decl
) = type
= complete_type (TREE_TYPE (decl
));
6188 if (DECL_HAS_VALUE_EXPR_P (decl
))
6190 /* A variable with DECL_HAS_VALUE_EXPR_P set is just a placeholder,
6191 it doesn't have storage to be initialized. */
6192 gcc_assert (init
== NULL_TREE
);
6196 if (type
== error_mark_node
)
6197 /* We will have already complained. */
6200 if (TREE_CODE (type
) == ARRAY_TYPE
)
6202 if (check_array_initializer (decl
, type
, init
))
6205 else if (!COMPLETE_TYPE_P (type
))
6207 error_at (DECL_SOURCE_LOCATION (decl
),
6208 "%q#D has incomplete type", decl
);
6209 TREE_TYPE (decl
) = error_mark_node
;
6213 /* There is no way to make a variable-sized class type in GNU C++. */
6214 gcc_assert (TREE_CONSTANT (TYPE_SIZE (type
)));
6216 if (init
&& BRACE_ENCLOSED_INITIALIZER_P (init
))
6218 int init_len
= CONSTRUCTOR_NELTS (init
);
6219 if (SCALAR_TYPE_P (type
))
6223 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS
);
6224 init
= build_zero_init (type
, NULL_TREE
, false);
6226 else if (init_len
!= 1 && TREE_CODE (type
) != COMPLEX_TYPE
)
6228 error_at (EXPR_LOC_OR_LOC (init
, DECL_SOURCE_LOCATION (decl
)),
6229 "scalar object %qD requires one element in "
6230 "initializer", decl
);
6231 TREE_TYPE (decl
) = error_mark_node
;
6237 if (TREE_CODE (decl
) == CONST_DECL
)
6239 gcc_assert (TREE_CODE (type
) != REFERENCE_TYPE
);
6241 DECL_INITIAL (decl
) = init
;
6243 gcc_assert (init
!= NULL_TREE
);
6246 else if (!init
&& DECL_REALLY_EXTERN (decl
))
6248 else if (init
|| type_build_ctor_call (type
)
6249 || TREE_CODE (type
) == REFERENCE_TYPE
)
6251 if (TREE_CODE (type
) == REFERENCE_TYPE
)
6253 init
= grok_reference_init (decl
, type
, init
, flags
);
6254 flags
|= LOOKUP_ALREADY_DIGESTED
;
6257 check_for_uninitialized_const_var (decl
);
6258 /* Do not reshape constructors of vectors (they don't need to be
6260 else if (BRACE_ENCLOSED_INITIALIZER_P (init
))
6262 if (is_std_init_list (type
))
6264 init
= perform_implicit_conversion (type
, init
,
6265 tf_warning_or_error
);
6266 flags
|= LOOKUP_ALREADY_DIGESTED
;
6268 else if (TYPE_NON_AGGREGATE_CLASS (type
))
6270 /* Don't reshape if the class has constructors. */
6271 if (cxx_dialect
== cxx98
)
6272 error_at (EXPR_LOC_OR_LOC (init
, DECL_SOURCE_LOCATION (decl
)),
6273 "in C++98 %qD must be initialized by "
6274 "constructor, not by %<{...}%>",
6277 else if (VECTOR_TYPE_P (type
) && TYPE_VECTOR_OPAQUE (type
))
6279 error ("opaque vector types cannot be initialized");
6280 init
= error_mark_node
;
6284 init
= reshape_init (type
, init
, tf_warning_or_error
);
6285 flags
|= LOOKUP_NO_NARROWING
;
6288 else if (TREE_CODE (init
) == TREE_LIST
6289 && TREE_TYPE (init
) != unknown_type_node
6290 && !MAYBE_CLASS_TYPE_P (type
))
6292 gcc_assert (TREE_CODE (decl
) != RESULT_DECL
);
6294 /* We get here with code like `int a (2);' */
6295 init
= build_x_compound_expr_from_list (init
, ELK_INIT
,
6296 tf_warning_or_error
);
6299 /* If DECL has an array type without a specific bound, deduce the
6300 array size from the initializer. */
6301 maybe_deduce_size_from_array_init (decl
, init
);
6302 type
= TREE_TYPE (decl
);
6303 if (type
== error_mark_node
)
6306 if (((type_build_ctor_call (type
) || CLASS_TYPE_P (type
))
6307 && !(flags
& LOOKUP_ALREADY_DIGESTED
)
6308 && !(init
&& BRACE_ENCLOSED_INITIALIZER_P (init
)
6309 && CP_AGGREGATE_TYPE_P (type
)
6310 && (CLASS_TYPE_P (type
)
6311 || !TYPE_NEEDS_CONSTRUCTING (type
)
6312 || type_has_extended_temps (type
))))
6313 || (DECL_DECOMPOSITION_P (decl
) && TREE_CODE (type
) == ARRAY_TYPE
))
6315 init_code
= build_aggr_init_full_exprs (decl
, init
, flags
);
6317 /* A constructor call is a non-trivial initializer even if
6318 it isn't explicitly written. */
6319 if (TREE_SIDE_EFFECTS (init_code
))
6320 DECL_NONTRIVIALLY_INITIALIZED_P (decl
) = true;
6322 /* If this is a constexpr initializer, expand_default_init will
6323 have returned an INIT_EXPR rather than a CALL_EXPR. In that
6324 case, pull the initializer back out and pass it down into
6325 store_init_value. */
6326 while (TREE_CODE (init_code
) == EXPR_STMT
6327 || TREE_CODE (init_code
) == CONVERT_EXPR
)
6328 init_code
= TREE_OPERAND (init_code
, 0);
6329 if (TREE_CODE (init_code
) == INIT_EXPR
)
6331 init
= TREE_OPERAND (init_code
, 1);
6332 init_code
= NULL_TREE
;
6333 /* Don't call digest_init; it's unnecessary and will complain
6334 about aggregate initialization of non-aggregate classes. */
6335 flags
|= LOOKUP_ALREADY_DIGESTED
;
6337 else if (DECL_DECLARED_CONSTEXPR_P (decl
))
6339 /* Declared constexpr, but no suitable initializer; massage
6340 init appropriately so we can pass it into store_init_value
6342 if (CLASS_TYPE_P (type
)
6343 && (!init
|| TREE_CODE (init
) == TREE_LIST
))
6345 init
= build_functional_cast (type
, init
, tf_none
);
6346 if (TREE_CODE (init
) == TARGET_EXPR
)
6347 TARGET_EXPR_DIRECT_INIT_P (init
) = true;
6349 init_code
= NULL_TREE
;
6355 if (init
&& TREE_CODE (init
) != TREE_VEC
)
6357 /* In aggregate initialization of a variable, each element
6358 initialization is a full-expression because there is no
6359 enclosing expression. */
6360 gcc_assert (stmts_are_full_exprs_p ());
6362 init_code
= store_init_value (decl
, init
, cleanups
, flags
);
6364 if (pedantic
&& TREE_CODE (type
) == ARRAY_TYPE
6365 && DECL_INITIAL (decl
)
6366 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
6367 && PAREN_STRING_LITERAL_P (DECL_INITIAL (decl
)))
6368 warning_at (EXPR_LOC_OR_LOC (DECL_INITIAL (decl
),
6369 DECL_SOURCE_LOCATION (decl
)),
6370 0, "array %qD initialized by parenthesized "
6371 "string literal %qE",
6372 decl
, DECL_INITIAL (decl
));
6378 if (CLASS_TYPE_P (core_type
= strip_array_types (type
))
6379 && (CLASSTYPE_READONLY_FIELDS_NEED_INIT (core_type
)
6380 || CLASSTYPE_REF_FIELDS_NEED_INIT (core_type
)))
6381 diagnose_uninitialized_cst_or_ref_member (core_type
, /*using_new=*/false,
6384 check_for_uninitialized_const_var (decl
);
6387 if (init
&& init
!= error_mark_node
)
6388 init_code
= build2 (INIT_EXPR
, type
, decl
, init
);
6392 /* We might have set these in cp_finish_decl. */
6393 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl
) = false;
6394 TREE_CONSTANT (decl
) = false;
6398 && (DECL_IN_AGGR_P (decl
) && !DECL_VAR_DECLARED_INLINE_P (decl
)))
6400 static int explained
= 0;
6402 if (cxx_dialect
< cxx11
)
6403 error ("initializer invalid for static member with constructor");
6404 else if (cxx_dialect
< cxx1z
)
6405 error ("non-constant in-class initialization invalid for static "
6406 "member %qD", decl
);
6408 error ("non-constant in-class initialization invalid for non-inline "
6409 "static member %qD", decl
);
6412 inform (input_location
,
6413 "(an out of class initialization is required)");
6422 /* If DECL is not a local variable, give it RTL. */
6425 make_rtl_for_nonlocal_decl (tree decl
, tree init
, const char* asmspec
)
6427 int toplev
= toplevel_bindings_p ();
6430 /* Set the DECL_ASSEMBLER_NAME for the object. */
6433 /* The `register' keyword, when used together with an
6434 asm-specification, indicates that the variable should be
6435 placed in a particular register. */
6436 if (VAR_P (decl
) && DECL_REGISTER (decl
))
6438 set_user_assembler_name (decl
, asmspec
);
6439 DECL_HARD_REGISTER (decl
) = 1;
6443 if (TREE_CODE (decl
) == FUNCTION_DECL
6444 && DECL_BUILT_IN_CLASS (decl
) == BUILT_IN_NORMAL
)
6445 set_builtin_user_assembler_name (decl
, asmspec
);
6446 set_user_assembler_name (decl
, asmspec
);
6450 /* Handle non-variables up front. */
6453 rest_of_decl_compilation (decl
, toplev
, at_eof
);
6457 /* If we see a class member here, it should be a static data
6459 if (DECL_LANG_SPECIFIC (decl
) && DECL_IN_AGGR_P (decl
))
6461 gcc_assert (TREE_STATIC (decl
));
6462 /* An in-class declaration of a static data member should be
6463 external; it is only a declaration, and not a definition. */
6464 if (init
== NULL_TREE
)
6465 gcc_assert (DECL_EXTERNAL (decl
)
6466 || !TREE_PUBLIC (decl
)
6467 || DECL_INLINE_VAR_P (decl
));
6470 /* We don't create any RTL for local variables. */
6471 if (DECL_FUNCTION_SCOPE_P (decl
) && !TREE_STATIC (decl
))
6474 /* We defer emission of local statics until the corresponding
6475 DECL_EXPR is expanded. But with constexpr its function might never
6476 be expanded, so go ahead and tell cgraph about the variable now. */
6477 defer_p
= ((DECL_FUNCTION_SCOPE_P (decl
)
6478 && !var_in_maybe_constexpr_fn (decl
))
6479 || DECL_VIRTUAL_P (decl
));
6481 /* Defer template instantiations. */
6482 if (DECL_LANG_SPECIFIC (decl
)
6483 && DECL_IMPLICIT_INSTANTIATION (decl
))
6486 /* If we're not deferring, go ahead and assemble the variable. */
6488 rest_of_decl_compilation (decl
, toplev
, at_eof
);
6491 /* walk_tree helper for wrap_temporary_cleanups, below. */
6494 wrap_cleanups_r (tree
*stmt_p
, int *walk_subtrees
, void *data
)
6496 /* Stop at types or full-expression boundaries. */
6497 if (TYPE_P (*stmt_p
)
6498 || TREE_CODE (*stmt_p
) == CLEANUP_POINT_EXPR
)
6504 if (TREE_CODE (*stmt_p
) == TARGET_EXPR
)
6506 tree guard
= (tree
)data
;
6507 tree tcleanup
= TARGET_EXPR_CLEANUP (*stmt_p
);
6509 tcleanup
= build2 (TRY_CATCH_EXPR
, void_type_node
, tcleanup
, guard
);
6510 /* Tell honor_protect_cleanup_actions to handle this as a separate
6512 TRY_CATCH_IS_CLEANUP (tcleanup
) = 1;
6514 TARGET_EXPR_CLEANUP (*stmt_p
) = tcleanup
;
6520 /* We're initializing a local variable which has a cleanup GUARD. If there
6521 are any temporaries used in the initializer INIT of this variable, we
6522 need to wrap their cleanups with TRY_CATCH_EXPR (, GUARD) so that the
6523 variable will be cleaned up properly if one of them throws.
6525 Unfortunately, there's no way to express this properly in terms of
6526 nesting, as the regions for the temporaries overlap the region for the
6527 variable itself; if there are two temporaries, the variable needs to be
6528 the first thing destroyed if either of them throws. However, we only
6529 want to run the variable's cleanup if it actually got constructed. So
6530 we need to guard the temporary cleanups with the variable's cleanup if
6531 they are run on the normal path, but not if they are run on the
6532 exceptional path. We implement this by telling
6533 honor_protect_cleanup_actions to strip the variable cleanup from the
6534 exceptional path. */
6537 wrap_temporary_cleanups (tree init
, tree guard
)
6539 cp_walk_tree_without_duplicates (&init
, wrap_cleanups_r
, (void *)guard
);
6542 /* Generate code to initialize DECL (a local variable). */
6545 initialize_local_var (tree decl
, tree init
)
6547 tree type
= TREE_TYPE (decl
);
6551 gcc_assert (VAR_P (decl
)
6552 || TREE_CODE (decl
) == RESULT_DECL
);
6553 gcc_assert (!TREE_STATIC (decl
));
6555 if (DECL_SIZE (decl
) == NULL_TREE
)
6557 /* If we used it already as memory, it must stay in memory. */
6558 DECL_INITIAL (decl
) = NULL_TREE
;
6559 TREE_ADDRESSABLE (decl
) = TREE_USED (decl
);
6563 if (type
== error_mark_node
)
6566 /* Compute and store the initial value. */
6567 already_used
= TREE_USED (decl
) || TREE_USED (type
);
6568 if (TREE_USED (type
))
6569 DECL_READ_P (decl
) = 1;
6571 /* Generate a cleanup, if necessary. */
6572 cleanup
= cxx_maybe_build_cleanup (decl
, tf_warning_or_error
);
6574 /* Perform the initialization. */
6577 tree rinit
= (TREE_CODE (init
) == INIT_EXPR
6578 ? TREE_OPERAND (init
, 1) : NULL_TREE
);
6579 if (rinit
&& !TREE_SIDE_EFFECTS (rinit
))
6581 /* Stick simple initializers in DECL_INITIAL so that
6582 -Wno-init-self works (c++/34772). */
6583 gcc_assert (TREE_OPERAND (init
, 0) == decl
);
6584 DECL_INITIAL (decl
) = rinit
;
6586 if (warn_init_self
&& TREE_CODE (type
) == REFERENCE_TYPE
)
6590 warning_at (DECL_SOURCE_LOCATION (decl
),
6592 "reference %qD is initialized with itself", decl
);
6597 int saved_stmts_are_full_exprs_p
;
6599 /* If we're only initializing a single object, guard the
6600 destructors of any temporaries used in its initializer with
6601 its destructor. This isn't right for arrays because each
6602 element initialization is a full-expression. */
6603 if (cleanup
&& TREE_CODE (type
) != ARRAY_TYPE
)
6604 wrap_temporary_cleanups (init
, cleanup
);
6606 gcc_assert (building_stmt_list_p ());
6607 saved_stmts_are_full_exprs_p
= stmts_are_full_exprs_p ();
6608 current_stmt_tree ()->stmts_are_full_exprs_p
= 1;
6609 finish_expr_stmt (init
);
6610 current_stmt_tree ()->stmts_are_full_exprs_p
=
6611 saved_stmts_are_full_exprs_p
;
6615 /* Set this to 0 so we can tell whether an aggregate which was
6616 initialized was ever used. Don't do this if it has a
6617 destructor, so we don't complain about the 'resource
6618 allocation is initialization' idiom. Now set
6619 attribute((unused)) on types so decls of that type will be
6620 marked used. (see TREE_USED, above.) */
6621 if (TYPE_NEEDS_CONSTRUCTING (type
)
6623 && TYPE_HAS_TRIVIAL_DESTRUCTOR (type
)
6624 && DECL_NAME (decl
))
6625 TREE_USED (decl
) = 0;
6626 else if (already_used
)
6627 TREE_USED (decl
) = 1;
6630 finish_decl_cleanup (decl
, cleanup
);
6633 /* DECL is a VAR_DECL for a compiler-generated variable with static
6634 storage duration (like a virtual table) whose initializer is a
6635 compile-time constant. Initialize the variable and provide it to the
6639 initialize_artificial_var (tree decl
, vec
<constructor_elt
, va_gc
> *v
)
6642 gcc_assert (DECL_ARTIFICIAL (decl
));
6643 init
= build_constructor (TREE_TYPE (decl
), v
);
6644 gcc_assert (TREE_CODE (init
) == CONSTRUCTOR
);
6645 DECL_INITIAL (decl
) = init
;
6646 DECL_INITIALIZED_P (decl
) = 1;
6647 determine_visibility (decl
);
6648 layout_var_decl (decl
);
6649 maybe_commonize_var (decl
);
6650 make_rtl_for_nonlocal_decl (decl
, init
, /*asmspec=*/NULL
);
6653 /* INIT is the initializer for a variable, as represented by the
6654 parser. Returns true iff INIT is type-dependent. */
6657 type_dependent_init_p (tree init
)
6659 if (TREE_CODE (init
) == TREE_LIST
)
6660 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
6661 return any_type_dependent_elements_p (init
);
6662 else if (TREE_CODE (init
) == CONSTRUCTOR
)
6663 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
6665 vec
<constructor_elt
, va_gc
> *elts
;
6669 elts
= CONSTRUCTOR_ELTS (init
);
6670 nelts
= vec_safe_length (elts
);
6671 for (i
= 0; i
< nelts
; ++i
)
6672 if (type_dependent_init_p ((*elts
)[i
].value
))
6676 /* It must be a simple expression, e.g., int i = 3; */
6677 return type_dependent_expression_p (init
);
6682 /* INIT is the initializer for a variable, as represented by the
6683 parser. Returns true iff INIT is value-dependent. */
6686 value_dependent_init_p (tree init
)
6688 if (TREE_CODE (init
) == TREE_LIST
)
6689 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
6690 return any_value_dependent_elements_p (init
);
6691 else if (TREE_CODE (init
) == CONSTRUCTOR
)
6692 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
6694 vec
<constructor_elt
, va_gc
> *elts
;
6698 elts
= CONSTRUCTOR_ELTS (init
);
6699 nelts
= vec_safe_length (elts
);
6700 for (i
= 0; i
< nelts
; ++i
)
6701 if (value_dependent_init_p ((*elts
)[i
].value
))
6705 /* It must be a simple expression, e.g., int i = 3; */
6706 return value_dependent_expression_p (init
);
6711 // Returns true if a DECL is VAR_DECL with the concept specifier.
6713 is_concept_var (tree decl
)
6715 return (VAR_P (decl
)
6716 // Not all variables have DECL_LANG_SPECIFIC.
6717 && DECL_LANG_SPECIFIC (decl
)
6718 && DECL_DECLARED_CONCEPT_P (decl
));
6721 /* A helper function to be called via walk_tree. If any label exists
6722 under *TP, it is (going to be) forced. Set has_forced_label_in_static. */
6725 notice_forced_label_r (tree
*tp
, int *walk_subtrees
, void *)
6729 if (TREE_CODE (*tp
) == LABEL_DECL
)
6730 cfun
->has_forced_label_in_static
= 1;
6734 /* Finish processing of a declaration;
6735 install its line number and initial value.
6736 If the length of an array type is not known before,
6737 it must be determined now, from the initial value, or it is an error.
6739 INIT is the initializer (if any) for DECL. If INIT_CONST_EXPR_P is
6740 true, then INIT is an integral constant expression.
6742 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
6743 if the (init) syntax was used. */
6746 cp_finish_decl (tree decl
, tree init
, bool init_const_expr_p
,
6747 tree asmspec_tree
, int flags
)
6750 vec
<tree
, va_gc
> *cleanups
= NULL
;
6751 const char *asmspec
= NULL
;
6752 int was_readonly
= 0;
6753 bool var_definition_p
= false;
6756 if (decl
== error_mark_node
)
6761 error ("assignment (not initialization) in declaration");
6765 gcc_assert (TREE_CODE (decl
) != RESULT_DECL
);
6766 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
6767 gcc_assert (TREE_CODE (decl
) != PARM_DECL
);
6769 type
= TREE_TYPE (decl
);
6770 if (type
== error_mark_node
)
6773 /* Warn about register storage specifiers except when in GNU global
6774 or local register variable extension. */
6775 if (VAR_P (decl
) && DECL_REGISTER (decl
) && asmspec_tree
== NULL_TREE
)
6777 if (cxx_dialect
>= cxx1z
)
6778 pedwarn (DECL_SOURCE_LOCATION (decl
), OPT_Wregister
,
6779 "ISO C++1z does not allow %<register%> storage "
6782 warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wregister
,
6783 "%<register%> storage class specifier used");
6786 /* If a name was specified, get the string. */
6787 if (at_namespace_scope_p ())
6788 asmspec_tree
= maybe_apply_renaming_pragma (decl
, asmspec_tree
);
6789 if (asmspec_tree
&& asmspec_tree
!= error_mark_node
)
6790 asmspec
= TREE_STRING_POINTER (asmspec_tree
);
6792 if (current_class_type
6793 && CP_DECL_CONTEXT (decl
) == current_class_type
6794 && TYPE_BEING_DEFINED (current_class_type
)
6795 && !CLASSTYPE_TEMPLATE_INSTANTIATION (current_class_type
)
6796 && (DECL_INITIAL (decl
) || init
))
6797 DECL_INITIALIZED_IN_CLASS_P (decl
) = 1;
6799 if (TREE_CODE (decl
) != FUNCTION_DECL
6800 && (auto_node
= type_uses_auto (type
)))
6803 if (init
== NULL_TREE
)
6805 if (DECL_LANG_SPECIFIC (decl
)
6806 && DECL_TEMPLATE_INSTANTIATION (decl
)
6807 && !DECL_TEMPLATE_INSTANTIATED (decl
))
6809 /* init is null because we're deferring instantiating the
6810 initializer until we need it. Well, we need it now. */
6811 instantiate_decl (decl
, /*defer_ok*/true, /*expl*/false);
6818 if (TREE_CODE (d_init
) == TREE_LIST
6819 && !CLASS_PLACEHOLDER_TEMPLATE (auto_node
))
6820 d_init
= build_x_compound_expr_from_list (d_init
, ELK_INIT
,
6821 tf_warning_or_error
);
6822 d_init
= resolve_nondeduced_context (d_init
, tf_warning_or_error
);
6823 enum auto_deduction_context adc
= adc_variable_type
;
6824 if (VAR_P (decl
) && DECL_DECOMPOSITION_P (decl
))
6825 adc
= adc_decomp_type
;
6826 type
= TREE_TYPE (decl
) = do_auto_deduction (type
, d_init
, auto_node
,
6827 tf_warning_or_error
, adc
,
6829 if (type
== error_mark_node
)
6831 if (TREE_CODE (type
) == FUNCTION_TYPE
)
6833 error ("initializer for %<decltype(auto) %D%> has function type "
6834 "(did you forget the %<()%> ?)", decl
);
6835 TREE_TYPE (decl
) = error_mark_node
;
6838 cp_apply_type_quals_to_decl (cp_type_quals (type
), decl
);
6841 if (!ensure_literal_type_for_constexpr_object (decl
))
6842 DECL_DECLARED_CONSTEXPR_P (decl
) = 0;
6845 && DECL_CLASS_SCOPE_P (decl
)
6846 && DECL_INITIALIZED_IN_CLASS_P (decl
))
6847 check_static_variable_definition (decl
, type
);
6849 if (init
&& TREE_CODE (decl
) == FUNCTION_DECL
)
6852 if (init
== ridpointers
[(int)RID_DELETE
])
6854 /* FIXME check this is 1st decl. */
6855 DECL_DELETED_FN (decl
) = 1;
6856 DECL_DECLARED_INLINE_P (decl
) = 1;
6857 DECL_INITIAL (decl
) = error_mark_node
;
6858 FOR_EACH_CLONE (clone
, decl
)
6860 DECL_DELETED_FN (clone
) = 1;
6861 DECL_DECLARED_INLINE_P (clone
) = 1;
6862 DECL_INITIAL (clone
) = error_mark_node
;
6866 else if (init
== ridpointers
[(int)RID_DEFAULT
])
6868 if (defaultable_fn_check (decl
))
6869 DECL_DEFAULTED_FN (decl
) = 1;
6871 DECL_INITIAL (decl
) = NULL_TREE
;
6875 if (init
&& VAR_P (decl
))
6877 DECL_NONTRIVIALLY_INITIALIZED_P (decl
) = 1;
6878 /* If DECL is a reference, then we want to know whether init is a
6879 reference constant; init_const_expr_p as passed tells us whether
6880 it's an rvalue constant. */
6881 if (TREE_CODE (type
) == REFERENCE_TYPE
)
6882 init_const_expr_p
= potential_constant_expression (init
);
6883 if (init_const_expr_p
)
6885 /* Set these flags now for templates. We'll update the flags in
6886 store_init_value for instantiations. */
6887 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl
) = 1;
6888 if (decl_maybe_constant_var_p (decl
)
6889 /* FIXME setting TREE_CONSTANT on refs breaks the back end. */
6890 && TREE_CODE (type
) != REFERENCE_TYPE
)
6891 TREE_CONSTANT (decl
) = 1;
6895 if (processing_template_decl
)
6897 bool type_dependent_p
;
6899 /* Add this declaration to the statement-tree. */
6900 if (at_function_scope_p ())
6901 add_decl_expr (decl
);
6903 type_dependent_p
= dependent_type_p (type
);
6905 if (check_for_bare_parameter_packs (init
))
6908 DECL_INITIAL (decl
) = NULL_TREE
;
6911 /* Generally, initializers in templates are expanded when the
6912 template is instantiated. But, if DECL is a variable constant
6913 then it can be used in future constant expressions, so its value
6914 must be available. */
6916 if (!VAR_P (decl
) || type_dependent_p
)
6917 /* We can't do anything if the decl has dependent type. */;
6919 && init_const_expr_p
6920 && TREE_CODE (type
) != REFERENCE_TYPE
6921 && decl_maybe_constant_var_p (decl
)
6922 && !type_dependent_init_p (init
)
6923 && !value_dependent_init_p (init
))
6925 /* This variable seems to be a non-dependent constant, so process
6926 its initializer. If check_initializer returns non-null the
6927 initialization wasn't constant after all. */
6929 cleanups
= make_tree_vector ();
6930 init_code
= check_initializer (decl
, init
, flags
, &cleanups
);
6931 if (init_code
== NULL_TREE
)
6933 release_tree_vector (cleanups
);
6935 else if (!init
&& is_concept_var (decl
))
6936 error ("variable concept has no initializer");
6937 else if (!DECL_PRETTY_FUNCTION_P (decl
))
6939 /* Deduce array size even if the initializer is dependent. */
6940 maybe_deduce_size_from_array_init (decl
, init
);
6941 /* And complain about multiple initializers. */
6942 if (init
&& TREE_CODE (init
) == TREE_LIST
&& TREE_CHAIN (init
)
6943 && !MAYBE_CLASS_TYPE_P (type
))
6944 init
= build_x_compound_expr_from_list (init
, ELK_INIT
,
6945 tf_warning_or_error
);
6949 DECL_INITIAL (decl
) = init
;
6953 /* Just store non-static data member initializers for later. */
6954 if (init
&& TREE_CODE (decl
) == FIELD_DECL
)
6955 DECL_INITIAL (decl
) = init
;
6957 /* Take care of TYPE_DECLs up front. */
6958 if (TREE_CODE (decl
) == TYPE_DECL
)
6960 if (type
!= error_mark_node
6961 && MAYBE_CLASS_TYPE_P (type
) && DECL_NAME (decl
))
6963 if (TREE_TYPE (DECL_NAME (decl
)) && TREE_TYPE (decl
) != type
)
6964 warning (0, "shadowing previous type declaration of %q#D", decl
);
6965 set_identifier_type_value (DECL_NAME (decl
), decl
);
6968 /* If we have installed this as the canonical typedef for this
6969 type, and that type has not been defined yet, delay emitting
6970 the debug information for it, as we will emit it later. */
6971 if (TYPE_MAIN_DECL (TREE_TYPE (decl
)) == decl
6972 && !COMPLETE_TYPE_P (TREE_TYPE (decl
)))
6973 TYPE_DECL_SUPPRESS_DEBUG (decl
) = 1;
6975 rest_of_decl_compilation (decl
, DECL_FILE_SCOPE_P (decl
),
6980 /* A reference will be modified here, as it is initialized. */
6981 if (! DECL_EXTERNAL (decl
)
6982 && TREE_READONLY (decl
)
6983 && TREE_CODE (type
) == REFERENCE_TYPE
)
6986 TREE_READONLY (decl
) = 0;
6991 /* If this is a local variable that will need a mangled name,
6992 register it now. We must do this before processing the
6993 initializer for the variable, since the initialization might
6994 require a guard variable, and since the mangled name of the
6995 guard variable will depend on the mangled name of this
6997 if (DECL_FUNCTION_SCOPE_P (decl
)
6998 && TREE_STATIC (decl
)
6999 && !DECL_ARTIFICIAL (decl
))
7001 push_local_name (decl
);
7002 /* Normally has_forced_label_in_static is set during GIMPLE
7003 lowering, but [cd]tors are never actually compiled directly.
7004 We need to set this early so we can deal with the label
7005 address extension. */
7006 if ((DECL_CONSTRUCTOR_P (current_function_decl
)
7007 || DECL_DESTRUCTOR_P (current_function_decl
))
7010 walk_tree (&init
, notice_forced_label_r
, NULL
, NULL
);
7011 add_local_decl (cfun
, decl
);
7013 /* And make sure it's in the symbol table for
7014 c_parse_final_cleanups to find. */
7015 varpool_node::get_create (decl
);
7018 /* Convert the initializer to the type of DECL, if we have not
7019 already initialized DECL. */
7020 if (!DECL_INITIALIZED_P (decl
)
7021 /* If !DECL_EXTERNAL then DECL is being defined. In the
7022 case of a static data member initialized inside the
7023 class-specifier, there can be an initializer even if DECL
7024 is *not* defined. */
7025 && (!DECL_EXTERNAL (decl
) || init
))
7027 cleanups
= make_tree_vector ();
7028 init
= check_initializer (decl
, init
, flags
, &cleanups
);
7034 The memory occupied by any object of static storage
7035 duration is zero-initialized at program startup before
7036 any other initialization takes place.
7038 We cannot create an appropriate initializer until after
7039 the type of DECL is finalized. If DECL_INITIAL is set,
7040 then the DECL is statically initialized, and any
7041 necessary zero-initialization has already been performed. */
7042 if (TREE_STATIC (decl
) && !DECL_INITIAL (decl
))
7043 DECL_INITIAL (decl
) = build_zero_init (TREE_TYPE (decl
),
7044 /*nelts=*/NULL_TREE
,
7045 /*static_storage_p=*/true);
7046 /* Remember that the initialization for this variable has
7048 DECL_INITIALIZED_P (decl
) = 1;
7049 /* This declaration is the definition of this variable,
7050 unless we are initializing a static data member within
7051 the class specifier. */
7052 if (!DECL_EXTERNAL (decl
))
7053 var_definition_p
= true;
7055 /* If the variable has an array type, lay out the type, even if
7056 there is no initializer. It is valid to index through the
7057 array, and we must get TYPE_ALIGN set correctly on the array
7059 else if (TREE_CODE (type
) == ARRAY_TYPE
)
7062 if (TREE_STATIC (decl
)
7063 && !at_function_scope_p ()
7064 && current_function_decl
== NULL
)
7065 /* So decl is a global variable or a static member of a
7066 non local class. Record the types it uses
7067 so that we can decide later to emit debug info for them. */
7068 record_types_used_by_current_var_decl (decl
);
7071 /* Add this declaration to the statement-tree. This needs to happen
7072 after the call to check_initializer so that the DECL_EXPR for a
7073 reference temp is added before the DECL_EXPR for the reference itself. */
7074 if (DECL_FUNCTION_SCOPE_P (decl
))
7076 /* If we're building a variable sized type, and we might be
7077 reachable other than via the top of the current binding
7078 level, then create a new BIND_EXPR so that we deallocate
7079 the object at the right time. */
7082 && !TREE_CONSTANT (DECL_SIZE (decl
))
7083 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list
))
7086 bind
= build3 (BIND_EXPR
, void_type_node
, NULL
, NULL
, NULL
);
7087 TREE_SIDE_EFFECTS (bind
) = 1;
7089 BIND_EXPR_BODY (bind
) = push_stmt_list ();
7091 add_decl_expr (decl
);
7094 /* Let the middle end know about variables and functions -- but not
7095 static data members in uninstantiated class templates. */
7096 if (VAR_OR_FUNCTION_DECL_P (decl
))
7100 layout_var_decl (decl
);
7101 maybe_commonize_var (decl
);
7104 /* This needs to happen after the linkage is set. */
7105 determine_visibility (decl
);
7107 if (var_definition_p
&& TREE_STATIC (decl
))
7109 /* If a TREE_READONLY variable needs initialization
7110 at runtime, it is no longer readonly and we need to
7111 avoid MEM_READONLY_P being set on RTL created for it. */
7114 if (TREE_READONLY (decl
))
7115 TREE_READONLY (decl
) = 0;
7118 else if (was_readonly
)
7119 TREE_READONLY (decl
) = 1;
7121 /* Likewise if it needs destruction. */
7122 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type
))
7123 TREE_READONLY (decl
) = 0;
7126 make_rtl_for_nonlocal_decl (decl
, init
, asmspec
);
7128 /* Check for abstractness of the type. Notice that there is no
7129 need to strip array types here since the check for those types
7130 is already done within create_array_type_for_decl. */
7131 abstract_virtuals_error (decl
, type
);
7133 if (TREE_TYPE (decl
) == error_mark_node
)
7134 /* No initialization required. */
7136 else if (TREE_CODE (decl
) == FUNCTION_DECL
)
7140 if (init
== ridpointers
[(int)RID_DEFAULT
])
7142 /* An out-of-class default definition is defined at
7143 the point where it is explicitly defaulted. */
7144 if (DECL_DELETED_FN (decl
))
7145 maybe_explain_implicit_delete (decl
);
7146 else if (DECL_INITIAL (decl
) == error_mark_node
)
7147 synthesize_method (decl
);
7150 error ("function %q#D is initialized like a variable", decl
);
7152 /* else no initialization required. */
7154 else if (DECL_EXTERNAL (decl
)
7155 && ! (DECL_LANG_SPECIFIC (decl
)
7156 && DECL_NOT_REALLY_EXTERN (decl
)))
7159 DECL_INITIAL (decl
) = init
;
7161 /* A variable definition. */
7162 else if (DECL_FUNCTION_SCOPE_P (decl
) && !TREE_STATIC (decl
))
7163 /* Initialize the local variable. */
7164 initialize_local_var (decl
, init
);
7166 /* If a variable is defined, and then a subsequent
7167 definition with external linkage is encountered, we will
7168 get here twice for the same variable. We want to avoid
7169 calling expand_static_init more than once. For variables
7170 that are not static data members, we can call
7171 expand_static_init only when we actually process the
7172 initializer. It is not legal to redeclare a static data
7173 member, so this issue does not arise in that case. */
7174 else if (var_definition_p
&& TREE_STATIC (decl
))
7175 expand_static_init (decl
, init
);
7178 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
7179 reference, insert it in the statement-tree now. */
7183 FOR_EACH_VEC_ELT (*cleanups
, i
, t
)
7184 push_cleanup (decl
, t
, false);
7185 release_tree_vector (cleanups
);
7189 TREE_READONLY (decl
) = 1;
7191 invoke_plugin_callbacks (PLUGIN_FINISH_DECL
, decl
);
7194 /* For class TYPE return itself or some its bases that contain
7195 any direct non-static data members. Return error_mark_node if an
7196 error has been diagnosed. */
7199 find_decomp_class_base (location_t loc
, tree type
, tree ret
)
7201 bool member_seen
= false;
7202 for (tree field
= TYPE_FIELDS (type
); field
; field
= DECL_CHAIN (field
))
7203 if (TREE_CODE (field
) != FIELD_DECL
|| DECL_ARTIFICIAL (field
))
7207 else if (ANON_AGGR_TYPE_P (TREE_TYPE (field
)))
7209 if (TREE_CODE (TREE_TYPE (field
)) == RECORD_TYPE
)
7210 error_at (loc
, "cannot decompose class type %qT because it has an "
7211 "anonymous struct member", type
);
7213 error_at (loc
, "cannot decompose class type %qT because it has an "
7214 "anonymous union member", type
);
7215 inform (DECL_SOURCE_LOCATION (field
), "declared here");
7216 return error_mark_node
;
7218 else if (TREE_PRIVATE (field
) || TREE_PROTECTED (field
))
7220 error_at (loc
, "cannot decompose non-public member %qD of %qT",
7222 inform (DECL_SOURCE_LOCATION (field
),
7223 TREE_PRIVATE (field
) ? "declared private here"
7224 : "declared protected here");
7225 return error_mark_node
;
7230 tree base_binfo
, binfo
;
7231 tree orig_ret
= ret
;
7235 for (binfo
= TYPE_BINFO (type
), i
= 0;
7236 BINFO_BASE_ITERATE (binfo
, i
, base_binfo
); i
++)
7238 tree t
= find_decomp_class_base (loc
, TREE_TYPE (base_binfo
), ret
);
7239 if (t
== error_mark_node
)
7240 return error_mark_node
;
7245 error_at (loc
, "cannot decompose class type %qT: both it and "
7246 "its base class %qT have non-static data members",
7248 return error_mark_node
;
7250 else if (orig_ret
!= NULL_TREE
)
7253 /* OK, found the same base along another path. We'll complain
7254 in convert_to_base if it's ambiguous. */;
7255 else if (ret
!= NULL_TREE
)
7257 error_at (loc
, "cannot decompose class type %qT: its base "
7258 "classes %qT and %qT have non-static data "
7259 "members", type
, ret
, t
);
7260 return error_mark_node
;
7269 /* Return std::tuple_size<TYPE>::value. */
7272 get_tuple_size (tree type
)
7274 tree args
= make_tree_vec (1);
7275 TREE_VEC_ELT (args
, 0) = type
;
7276 tree inst
= lookup_template_class (get_identifier ("tuple_size"), args
,
7277 /*in_decl*/NULL_TREE
,
7278 /*context*/std_node
,
7279 /*entering_scope*/false, tf_none
);
7280 inst
= complete_type (inst
);
7281 if (inst
== error_mark_node
|| !COMPLETE_TYPE_P (inst
))
7283 tree val
= lookup_qualified_name (inst
, get_identifier ("value"),
7284 /*type*/false, /*complain*/false);
7285 if (TREE_CODE (val
) == VAR_DECL
|| TREE_CODE (val
) == CONST_DECL
)
7286 val
= maybe_constant_value (val
);
7287 if (TREE_CODE (val
) == INTEGER_CST
)
7290 return error_mark_node
;
7293 /* Return std::tuple_element<I,TYPE>::type. */
7296 get_tuple_element_type (tree type
, unsigned i
)
7298 tree args
= make_tree_vec (2);
7299 TREE_VEC_ELT (args
, 0) = build_int_cst (integer_type_node
, i
);
7300 TREE_VEC_ELT (args
, 1) = type
;
7301 tree inst
= lookup_template_class (get_identifier ("tuple_element"), args
,
7302 /*in_decl*/NULL_TREE
,
7303 /*context*/std_node
,
7304 /*entering_scope*/false,
7305 tf_warning_or_error
);
7306 return make_typename_type (inst
, get_identifier ("type"),
7307 none_type
, tf_warning_or_error
);
7310 /* Return e.get<i>() or get<i>(e). */
7313 get_tuple_decomp_init (tree decl
, unsigned i
)
7315 tree get_id
= get_identifier ("get");
7316 tree targs
= make_tree_vec (1);
7317 TREE_VEC_ELT (targs
, 0) = build_int_cst (integer_type_node
, i
);
7319 tree etype
= TREE_TYPE (decl
);
7320 tree e
= convert_from_reference (decl
);
7322 /* [The id-expression] e is an lvalue if the type of the entity e is an
7323 lvalue reference and an xvalue otherwise. */
7324 if (TREE_CODE (etype
) != REFERENCE_TYPE
7325 || TYPE_REF_IS_RVALUE (etype
))
7328 tree fns
= lookup_qualified_name (TREE_TYPE (e
), get_id
,
7329 /*type*/false, /*complain*/false);
7330 if (fns
!= error_mark_node
)
7332 fns
= lookup_template_function (fns
, targs
);
7333 return build_new_method_call (e
, fns
, /*args*/NULL
,
7334 /*path*/NULL_TREE
, LOOKUP_NORMAL
,
7335 /*fn_p*/NULL
, tf_warning_or_error
);
7339 vec
<tree
,va_gc
> *args
= make_tree_vector_single (e
);
7340 fns
= lookup_template_function (get_id
, targs
);
7341 fns
= perform_koenig_lookup (fns
, args
, tf_warning_or_error
);
7342 return finish_call_expr (fns
, &args
, /*novirt*/false,
7343 /*koenig*/true, tf_warning_or_error
);
7347 /* It's impossible to recover the decltype of a tuple decomposition variable
7348 based on the actual type of the variable, so store it in a hash table. */
7349 static GTY(()) hash_map
<tree
,tree
> *decomp_type_table
;
7351 store_decomp_type (tree v
, tree t
)
7353 if (!decomp_type_table
)
7354 decomp_type_table
= hash_map
<tree
,tree
>::create_ggc (13);
7355 decomp_type_table
->put (v
, t
);
7359 lookup_decomp_type (tree v
)
7361 return *decomp_type_table
->get (v
);
7364 /* Finish a decomposition declaration. DECL is the underlying declaration
7365 "e", FIRST is the head of a chain of decls for the individual identifiers
7366 chained through DECL_CHAIN in reverse order and COUNT is the number of
7370 cp_finish_decomp (tree decl
, tree first
, unsigned int count
)
7372 if (error_operand_p (decl
))
7377 TREE_TYPE (first
) = error_mark_node
;
7378 if (DECL_HAS_VALUE_EXPR_P (first
))
7380 SET_DECL_VALUE_EXPR (first
, NULL_TREE
);
7381 DECL_HAS_VALUE_EXPR_P (first
) = 0;
7383 first
= DECL_CHAIN (first
);
7385 TREE_TYPE (decl
) = error_mark_node
;
7386 if (DECL_P (decl
) && DECL_NAMESPACE_SCOPE_P (decl
))
7387 SET_DECL_ASSEMBLER_NAME (decl
, get_identifier ("<decomp>"));
7391 location_t loc
= DECL_SOURCE_LOCATION (decl
);
7392 if (type_dependent_expression_p (decl
)
7393 /* This happens for range for when not in templates.
7394 Still add the DECL_VALUE_EXPRs for later processing. */
7395 || (!processing_template_decl
7396 && type_uses_auto (TREE_TYPE (decl
))))
7398 for (unsigned int i
= 0; i
< count
; i
++)
7400 if (!DECL_HAS_VALUE_EXPR_P (first
))
7402 tree v
= build_nt (ARRAY_REF
, decl
,
7403 size_int (count
- i
- 1),
7404 NULL_TREE
, NULL_TREE
);
7405 SET_DECL_VALUE_EXPR (first
, v
);
7406 DECL_HAS_VALUE_EXPR_P (first
) = 1;
7408 if (processing_template_decl
)
7410 retrofit_lang_decl (first
);
7411 SET_DECL_DECOMPOSITION_P (first
);
7413 first
= DECL_CHAIN (first
);
7418 auto_vec
<tree
, 16> v
;
7419 v
.safe_grow (count
);
7421 for (unsigned int i
= 0; i
< count
; i
++, d
= DECL_CHAIN (d
))
7423 v
[count
- i
- 1] = d
;
7424 retrofit_lang_decl (d
);
7425 SET_DECL_DECOMPOSITION_P (d
);
7428 tree type
= TREE_TYPE (decl
);
7431 if (TREE_CODE (type
) == REFERENCE_TYPE
)
7433 /* If e is a constant reference, use the referent directly. */
7434 if (DECL_INITIAL (decl
))
7435 dexp
= DECL_INITIAL (decl
);
7436 dexp
= convert_from_reference (dexp
);
7437 type
= TREE_TYPE (type
);
7440 tree eltype
= NULL_TREE
;
7441 unsigned HOST_WIDE_INT eltscnt
= 0;
7442 if (TREE_CODE (type
) == ARRAY_TYPE
)
7445 nelts
= array_type_nelts_top (type
);
7446 if (nelts
== error_mark_node
)
7448 if (!tree_fits_uhwi_p (nelts
))
7450 error_at (loc
, "cannot decompose variable length array %qT", type
);
7453 eltscnt
= tree_to_uhwi (nelts
);
7454 if (count
!= eltscnt
)
7457 if (count
> eltscnt
)
7458 error_at (loc
, "%u names provided while %qT decomposes into "
7459 "%wu elements", count
, type
, eltscnt
);
7461 error_at (loc
, "only %u names provided while %qT decomposes into "
7462 "%wu elements", count
, type
, eltscnt
);
7465 eltype
= TREE_TYPE (type
);
7466 for (unsigned int i
= 0; i
< count
; i
++)
7468 TREE_TYPE (v
[i
]) = eltype
;
7469 layout_decl (v
[i
], 0);
7471 t
= build4_loc (DECL_SOURCE_LOCATION (v
[i
]), ARRAY_REF
,
7472 eltype
, t
, size_int (i
), NULL_TREE
,
7474 SET_DECL_VALUE_EXPR (v
[i
], t
);
7475 DECL_HAS_VALUE_EXPR_P (v
[i
]) = 1;
7478 /* 2 GNU extensions. */
7479 else if (TREE_CODE (type
) == COMPLEX_TYPE
)
7482 if (count
!= eltscnt
)
7484 eltype
= cp_build_qualified_type (TREE_TYPE (type
), TYPE_QUALS (type
));
7485 for (unsigned int i
= 0; i
< count
; i
++)
7487 TREE_TYPE (v
[i
]) = eltype
;
7488 layout_decl (v
[i
], 0);
7490 t
= build1_loc (DECL_SOURCE_LOCATION (v
[i
]),
7491 i
? IMAGPART_EXPR
: REALPART_EXPR
, eltype
,
7493 SET_DECL_VALUE_EXPR (v
[i
], t
);
7494 DECL_HAS_VALUE_EXPR_P (v
[i
]) = 1;
7497 else if (TREE_CODE (type
) == VECTOR_TYPE
)
7499 eltscnt
= TYPE_VECTOR_SUBPARTS (type
);
7500 if (count
!= eltscnt
)
7502 eltype
= cp_build_qualified_type (TREE_TYPE (type
), TYPE_QUALS (type
));
7503 for (unsigned int i
= 0; i
< count
; i
++)
7505 TREE_TYPE (v
[i
]) = eltype
;
7506 layout_decl (v
[i
], 0);
7508 convert_vector_to_array_for_subscript (DECL_SOURCE_LOCATION (v
[i
]),
7510 t
= build4_loc (DECL_SOURCE_LOCATION (v
[i
]), ARRAY_REF
,
7511 eltype
, t
, size_int (i
), NULL_TREE
,
7513 SET_DECL_VALUE_EXPR (v
[i
], t
);
7514 DECL_HAS_VALUE_EXPR_P (v
[i
]) = 1;
7517 else if (tree tsize
= get_tuple_size (type
))
7519 if (tsize
== error_mark_node
)
7521 error_at (loc
, "%<std::tuple_size<%T>::value%> is not an integral "
7522 "constant expression", type
);
7525 eltscnt
= tree_to_uhwi (tsize
);
7526 if (count
!= eltscnt
)
7528 for (unsigned i
= 0; i
< count
; ++i
)
7530 location_t sloc
= input_location
;
7531 location_t dloc
= DECL_SOURCE_LOCATION (v
[i
]);
7533 input_location
= dloc
;
7534 tree init
= get_tuple_decomp_init (decl
, i
);
7535 tree eltype
= (init
== error_mark_node
? error_mark_node
7536 : get_tuple_element_type (type
, i
));
7537 input_location
= sloc
;
7539 if (init
== error_mark_node
|| eltype
== error_mark_node
)
7541 inform (dloc
, "in initialization of decomposition variable %qD",
7545 /* Save the decltype away before reference collapse. */
7546 store_decomp_type (v
[i
], eltype
);
7547 eltype
= cp_build_reference_type (eltype
, !lvalue_p (init
));
7548 TREE_TYPE (v
[i
]) = eltype
;
7549 layout_decl (v
[i
], 0);
7550 if (DECL_HAS_VALUE_EXPR_P (v
[i
]))
7552 /* In this case the names are variables, not just proxies. */
7553 SET_DECL_VALUE_EXPR (v
[i
], NULL_TREE
);
7554 DECL_HAS_VALUE_EXPR_P (v
[i
]) = 0;
7556 cp_finish_decl (v
[i
], init
, /*constexpr*/false,
7557 /*asm*/NULL_TREE
, LOOKUP_NORMAL
);
7560 else if (TREE_CODE (type
) == UNION_TYPE
)
7562 error_at (loc
, "cannot decompose union type %qT", type
);
7565 else if (!CLASS_TYPE_P (type
))
7567 error_at (loc
, "cannot decompose non-array non-class type %qT", type
);
7570 else if (LAMBDA_TYPE_P (type
))
7572 error_at (loc
, "cannot decompose lambda closure type %qT", type
);
7577 tree btype
= find_decomp_class_base (loc
, type
, NULL_TREE
);
7578 if (btype
== error_mark_node
)
7580 else if (btype
== NULL_TREE
)
7582 error_at (loc
, "cannot decompose class type %qT without non-static "
7583 "data members", type
);
7586 for (tree field
= TYPE_FIELDS (btype
); field
; field
= TREE_CHAIN (field
))
7587 if (TREE_CODE (field
) != FIELD_DECL
|| DECL_ARTIFICIAL (field
))
7591 if (count
!= eltscnt
)
7596 t
= convert_to_base (t
, btype
, /*check_access*/true,
7597 /*nonnull*/false, tf_warning_or_error
);
7601 for (tree field
= TYPE_FIELDS (btype
); field
; field
= TREE_CHAIN (field
))
7602 if (TREE_CODE (field
) != FIELD_DECL
|| DECL_ARTIFICIAL (field
))
7606 tree tt
= finish_non_static_data_member (field
, t
, NULL_TREE
);
7607 if (REFERENCE_REF_P (tt
))
7608 tt
= TREE_OPERAND (tt
, 0);
7609 TREE_TYPE (v
[i
]) = TREE_TYPE (tt
);
7610 layout_decl (v
[i
], 0);
7611 SET_DECL_VALUE_EXPR (v
[i
], tt
);
7612 DECL_HAS_VALUE_EXPR_P (v
[i
]) = 1;
7616 if (DECL_NAMESPACE_SCOPE_P (decl
))
7617 SET_DECL_ASSEMBLER_NAME (decl
, mangle_decomp (decl
, v
));
7620 /* Returns a declaration for a VAR_DECL as if:
7622 extern "C" TYPE NAME;
7624 had been seen. Used to create compiler-generated global
7628 declare_global_var (tree name
, tree type
)
7632 push_to_top_level ();
7633 decl
= build_decl (input_location
, VAR_DECL
, name
, type
);
7634 TREE_PUBLIC (decl
) = 1;
7635 DECL_EXTERNAL (decl
) = 1;
7636 DECL_ARTIFICIAL (decl
) = 1;
7637 /* If the user has explicitly declared this variable (perhaps
7638 because the code we are compiling is part of a low-level runtime
7639 library), then it is possible that our declaration will be merged
7640 with theirs by pushdecl. */
7641 decl
= pushdecl (decl
);
7642 cp_finish_decl (decl
, NULL_TREE
, false, NULL_TREE
, 0);
7643 pop_from_top_level ();
7648 /* Returns the type for the argument to "__cxa_atexit" (or "atexit",
7649 if "__cxa_atexit" is not being used) corresponding to the function
7650 to be called when the program exits. */
7653 get_atexit_fn_ptr_type (void)
7657 if (!atexit_fn_ptr_type_node
)
7660 if (flag_use_cxa_atexit
7661 && !targetm
.cxx
.use_atexit_for_cxa_atexit ())
7662 /* The parameter to "__cxa_atexit" is "void (*)(void *)". */
7663 arg_type
= ptr_type_node
;
7665 /* The parameter to "atexit" is "void (*)(void)". */
7666 arg_type
= NULL_TREE
;
7668 fn_type
= build_function_type_list (void_type_node
,
7669 arg_type
, NULL_TREE
);
7670 atexit_fn_ptr_type_node
= build_pointer_type (fn_type
);
7673 return atexit_fn_ptr_type_node
;
7676 /* Returns a pointer to the `atexit' function. Note that if
7677 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
7678 `__cxa_atexit' function specified in the IA64 C++ ABI. */
7681 get_atexit_node (void)
7687 bool use_aeabi_atexit
;
7692 if (flag_use_cxa_atexit
&& !targetm
.cxx
.use_atexit_for_cxa_atexit ())
7694 /* The declaration for `__cxa_atexit' is:
7696 int __cxa_atexit (void (*)(void *), void *, void *)
7698 We build up the argument types and then the function type
7700 tree argtype0
, argtype1
, argtype2
;
7702 use_aeabi_atexit
= targetm
.cxx
.use_aeabi_atexit ();
7703 /* First, build the pointer-to-function type for the first
7705 fn_ptr_type
= get_atexit_fn_ptr_type ();
7706 /* Then, build the rest of the argument types. */
7707 argtype2
= ptr_type_node
;
7708 if (use_aeabi_atexit
)
7710 argtype1
= fn_ptr_type
;
7711 argtype0
= ptr_type_node
;
7715 argtype1
= ptr_type_node
;
7716 argtype0
= fn_ptr_type
;
7718 /* And the final __cxa_atexit type. */
7719 fn_type
= build_function_type_list (integer_type_node
,
7720 argtype0
, argtype1
, argtype2
,
7722 if (use_aeabi_atexit
)
7723 name
= "__aeabi_atexit";
7725 name
= "__cxa_atexit";
7729 /* The declaration for `atexit' is:
7731 int atexit (void (*)());
7733 We build up the argument types and then the function type
7735 fn_ptr_type
= get_atexit_fn_ptr_type ();
7736 /* Build the final atexit type. */
7737 fn_type
= build_function_type_list (integer_type_node
,
7738 fn_ptr_type
, NULL_TREE
);
7742 /* Now, build the function declaration. */
7743 push_lang_context (lang_name_c
);
7744 atexit_fndecl
= build_library_fn_ptr (name
, fn_type
, ECF_LEAF
| ECF_NOTHROW
);
7745 mark_used (atexit_fndecl
);
7746 pop_lang_context ();
7747 atexit_node
= decay_conversion (atexit_fndecl
, tf_warning_or_error
);
7752 /* Like get_atexit_node, but for thread-local cleanups. */
7755 get_thread_atexit_node (void)
7757 /* The declaration for `__cxa_thread_atexit' is:
7759 int __cxa_thread_atexit (void (*)(void *), void *, void *) */
7760 tree fn_type
= build_function_type_list (integer_type_node
,
7761 get_atexit_fn_ptr_type (),
7762 ptr_type_node
, ptr_type_node
,
7765 /* Now, build the function declaration. */
7766 tree atexit_fndecl
= build_library_fn_ptr ("__cxa_thread_atexit", fn_type
,
7767 ECF_LEAF
| ECF_NOTHROW
);
7768 return decay_conversion (atexit_fndecl
, tf_warning_or_error
);
7771 /* Returns the __dso_handle VAR_DECL. */
7774 get_dso_handle_node (void)
7776 if (dso_handle_node
)
7777 return dso_handle_node
;
7779 /* Declare the variable. */
7780 dso_handle_node
= declare_global_var (get_identifier ("__dso_handle"),
7783 #ifdef HAVE_GAS_HIDDEN
7784 if (dso_handle_node
!= error_mark_node
)
7786 DECL_VISIBILITY (dso_handle_node
) = VISIBILITY_HIDDEN
;
7787 DECL_VISIBILITY_SPECIFIED (dso_handle_node
) = 1;
7791 return dso_handle_node
;
7794 /* Begin a new function with internal linkage whose job will be simply
7795 to destroy some particular variable. */
7797 static GTY(()) int start_cleanup_cnt
;
7800 start_cleanup_fn (void)
7805 bool use_cxa_atexit
= flag_use_cxa_atexit
7806 && !targetm
.cxx
.use_atexit_for_cxa_atexit ();
7808 push_to_top_level ();
7810 /* No need to mangle this. */
7811 push_lang_context (lang_name_c
);
7813 /* Build the name of the function. */
7814 sprintf (name
, "__tcf_%d", start_cleanup_cnt
++);
7815 /* Build the function declaration. */
7816 fntype
= TREE_TYPE (get_atexit_fn_ptr_type ());
7817 fndecl
= build_lang_decl (FUNCTION_DECL
, get_identifier (name
), fntype
);
7818 /* It's a function with internal linkage, generated by the
7820 TREE_PUBLIC (fndecl
) = 0;
7821 DECL_ARTIFICIAL (fndecl
) = 1;
7822 /* Make the function `inline' so that it is only emitted if it is
7823 actually needed. It is unlikely that it will be inlined, since
7824 it is only called via a function pointer, but we avoid unnecessary
7825 emissions this way. */
7826 DECL_DECLARED_INLINE_P (fndecl
) = 1;
7827 DECL_INTERFACE_KNOWN (fndecl
) = 1;
7828 /* Build the parameter. */
7833 parmdecl
= cp_build_parm_decl (NULL_TREE
, ptr_type_node
);
7834 DECL_CONTEXT (parmdecl
) = fndecl
;
7835 TREE_USED (parmdecl
) = 1;
7836 DECL_READ_P (parmdecl
) = 1;
7837 DECL_ARGUMENTS (fndecl
) = parmdecl
;
7841 start_preparsed_function (fndecl
, NULL_TREE
, SF_PRE_PARSED
);
7843 pop_lang_context ();
7845 return current_function_decl
;
7848 /* Finish the cleanup function begun by start_cleanup_fn. */
7851 end_cleanup_fn (void)
7853 expand_or_defer_fn (finish_function (0));
7855 pop_from_top_level ();
7858 /* Generate code to handle the destruction of DECL, an object with
7859 static storage duration. */
7862 register_dtor_fn (tree decl
)
7869 bool ob_parm
, dso_parm
, use_dtor
;
7870 tree arg0
, arg1
, arg2
;
7873 type
= TREE_TYPE (decl
);
7874 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type
))
7877 /* If we're using "__cxa_atexit" (or "__cxa_thread_atexit" or
7878 "__aeabi_atexit"), and DECL is a class object, we can just pass the
7879 destructor to "__cxa_atexit"; we don't have to build a temporary
7880 function to do the cleanup. */
7881 dso_parm
= (flag_use_cxa_atexit
7882 && !targetm
.cxx
.use_atexit_for_cxa_atexit ());
7883 ob_parm
= (CP_DECL_THREAD_LOCAL_P (decl
) || dso_parm
);
7884 use_dtor
= ob_parm
&& CLASS_TYPE_P (type
);
7889 /* Find the destructor. */
7890 idx
= lookup_fnfields_1 (type
, complete_dtor_identifier
);
7891 gcc_assert (idx
>= 0);
7892 cleanup
= (*CLASSTYPE_METHOD_VEC (type
))[idx
];
7893 /* Make sure it is accessible. */
7894 perform_or_defer_access_check (TYPE_BINFO (type
), cleanup
, cleanup
,
7895 tf_warning_or_error
);
7899 /* Call build_cleanup before we enter the anonymous function so
7900 that any access checks will be done relative to the current
7901 scope, rather than the scope of the anonymous function. */
7902 build_cleanup (decl
);
7904 /* Now start the function. */
7905 cleanup
= start_cleanup_fn ();
7907 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
7908 to the original function, rather than the anonymous one. That
7909 will make the back end think that nested functions are in use,
7910 which causes confusion. */
7911 push_deferring_access_checks (dk_no_check
);
7912 fcall
= build_cleanup (decl
);
7913 pop_deferring_access_checks ();
7915 /* Create the body of the anonymous function. */
7916 compound_stmt
= begin_compound_stmt (BCS_FN_BODY
);
7917 finish_expr_stmt (fcall
);
7918 finish_compound_stmt (compound_stmt
);
7922 /* Call atexit with the cleanup function. */
7923 mark_used (cleanup
);
7924 cleanup
= build_address (cleanup
);
7926 if (CP_DECL_THREAD_LOCAL_P (decl
))
7927 atex_node
= get_thread_atexit_node ();
7929 atex_node
= get_atexit_node ();
7933 /* We must convert CLEANUP to the type that "__cxa_atexit"
7935 cleanup
= build_nop (get_atexit_fn_ptr_type (), cleanup
);
7936 /* "__cxa_atexit" will pass the address of DECL to the
7937 cleanup function. */
7939 addr
= build_address (decl
);
7940 /* The declared type of the parameter to "__cxa_atexit" is
7941 "void *". For plain "T*", we could just let the
7942 machinery in cp_build_function_call convert it -- but if the
7943 type is "cv-qualified T *", then we need to convert it
7944 before passing it in, to avoid spurious errors. */
7945 addr
= build_nop (ptr_type_node
, addr
);
7948 /* Since the cleanup functions we build ignore the address
7949 they're given, there's no reason to pass the actual address
7950 in, and, in general, it's cheaper to pass NULL than any
7952 addr
= null_pointer_node
;
7955 arg2
= cp_build_addr_expr (get_dso_handle_node (),
7956 tf_warning_or_error
);
7958 /* Just pass NULL to the dso handle parm if we don't actually
7959 have a DSO handle on this target. */
7960 arg2
= null_pointer_node
;
7966 if (!CP_DECL_THREAD_LOCAL_P (decl
)
7967 && targetm
.cxx
.use_aeabi_atexit ())
7983 return cp_build_function_call_nary (atex_node
, tf_warning_or_error
,
7984 arg0
, arg1
, arg2
, NULL_TREE
);
7987 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
7988 is its initializer. Generate code to handle the construction
7989 and destruction of DECL. */
7992 expand_static_init (tree decl
, tree init
)
7994 gcc_assert (VAR_P (decl
));
7995 gcc_assert (TREE_STATIC (decl
));
7997 /* Some variables require no dynamic initialization. */
7998 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl
)))
8000 /* Make sure the destructor is callable. */
8001 cxx_maybe_build_cleanup (decl
, tf_warning_or_error
);
8006 if (CP_DECL_THREAD_LOCAL_P (decl
) && DECL_GNU_TLS_P (decl
)
8007 && !DECL_FUNCTION_SCOPE_P (decl
))
8010 error ("non-local variable %qD declared %<__thread%> "
8011 "needs dynamic initialization", decl
);
8013 error ("non-local variable %qD declared %<__thread%> "
8014 "has a non-trivial destructor", decl
);
8015 static bool informed
;
8018 inform (DECL_SOURCE_LOCATION (decl
),
8019 "C++11 %<thread_local%> allows dynamic initialization "
8026 if (DECL_FUNCTION_SCOPE_P (decl
))
8028 /* Emit code to perform this initialization but once. */
8029 tree if_stmt
= NULL_TREE
, inner_if_stmt
= NULL_TREE
;
8030 tree then_clause
= NULL_TREE
, inner_then_clause
= NULL_TREE
;
8031 tree guard
, guard_addr
;
8033 /* We don't need thread-safety code for thread-local vars. */
8034 bool thread_guard
= (flag_threadsafe_statics
8035 && !CP_DECL_THREAD_LOCAL_P (decl
));
8037 /* Emit code to perform this initialization but once. This code
8040 static <type> guard;
8041 if (!__atomic_load (guard.first_byte)) {
8042 if (__cxa_guard_acquire (&guard)) {
8045 // Do initialization.
8046 flag = true; __cxa_guard_release (&guard);
8047 // Register variable for destruction at end of program.
8049 if (!flag) __cxa_guard_abort (&guard);
8053 Note that the `flag' variable is only set to 1 *after* the
8054 initialization is complete. This ensures that an exception,
8055 thrown during the construction, will cause the variable to
8056 reinitialized when we pass through this code again, as per:
8060 If the initialization exits by throwing an exception, the
8061 initialization is not complete, so it will be tried again
8062 the next time control enters the declaration.
8064 This process should be thread-safe, too; multiple threads
8065 should not be able to initialize the variable more than
8068 /* Create the guard variable. */
8069 guard
= get_guard (decl
);
8071 /* Begin the conditional initialization. */
8072 if_stmt
= begin_if_stmt ();
8074 finish_if_stmt_cond (get_guard_cond (guard
, thread_guard
), if_stmt
);
8075 then_clause
= begin_compound_stmt (BCS_NO_SCOPE
);
8079 tree vfntype
= NULL_TREE
;
8080 tree acquire_name
, release_name
, abort_name
;
8081 tree acquire_fn
, release_fn
, abort_fn
;
8082 guard_addr
= build_address (guard
);
8084 acquire_name
= get_identifier ("__cxa_guard_acquire");
8085 release_name
= get_identifier ("__cxa_guard_release");
8086 abort_name
= get_identifier ("__cxa_guard_abort");
8087 acquire_fn
= identifier_global_value (acquire_name
);
8088 release_fn
= identifier_global_value (release_name
);
8089 abort_fn
= identifier_global_value (abort_name
);
8091 acquire_fn
= push_library_fn
8092 (acquire_name
, build_function_type_list (integer_type_node
,
8093 TREE_TYPE (guard_addr
),
8095 NULL_TREE
, ECF_NOTHROW
| ECF_LEAF
);
8096 if (!release_fn
|| !abort_fn
)
8097 vfntype
= build_function_type_list (void_type_node
,
8098 TREE_TYPE (guard_addr
),
8101 release_fn
= push_library_fn (release_name
, vfntype
, NULL_TREE
,
8102 ECF_NOTHROW
| ECF_LEAF
);
8104 abort_fn
= push_library_fn (abort_name
, vfntype
, NULL_TREE
,
8105 ECF_NOTHROW
| ECF_LEAF
);
8107 inner_if_stmt
= begin_if_stmt ();
8108 finish_if_stmt_cond (build_call_n (acquire_fn
, 1, guard_addr
),
8111 inner_then_clause
= begin_compound_stmt (BCS_NO_SCOPE
);
8112 begin
= get_target_expr (boolean_false_node
);
8113 flag
= TARGET_EXPR_SLOT (begin
);
8115 TARGET_EXPR_CLEANUP (begin
)
8116 = build3 (COND_EXPR
, void_type_node
, flag
,
8118 build_call_n (abort_fn
, 1, guard_addr
));
8119 CLEANUP_EH_ONLY (begin
) = 1;
8121 /* Do the initialization itself. */
8122 init
= add_stmt_to_compound (begin
, init
);
8123 init
= add_stmt_to_compound
8124 (init
, build2 (MODIFY_EXPR
, void_type_node
, flag
, boolean_true_node
));
8125 init
= add_stmt_to_compound
8126 (init
, build_call_n (release_fn
, 1, guard_addr
));
8129 init
= add_stmt_to_compound (init
, set_guard (guard
));
8131 /* Use atexit to register a function for destroying this static
8133 init
= add_stmt_to_compound (init
, register_dtor_fn (decl
));
8135 finish_expr_stmt (init
);
8139 finish_compound_stmt (inner_then_clause
);
8140 finish_then_clause (inner_if_stmt
);
8141 finish_if_stmt (inner_if_stmt
);
8144 finish_compound_stmt (then_clause
);
8145 finish_then_clause (if_stmt
);
8146 finish_if_stmt (if_stmt
);
8148 else if (CP_DECL_THREAD_LOCAL_P (decl
))
8149 tls_aggregates
= tree_cons (init
, decl
, tls_aggregates
);
8151 static_aggregates
= tree_cons (init
, decl
, static_aggregates
);
8155 /* Make TYPE a complete type based on INITIAL_VALUE.
8156 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
8157 2 if there was no information (in which case assume 0 if DO_DEFAULT),
8158 3 if the initializer list is empty (in pedantic mode). */
8161 cp_complete_array_type (tree
*ptype
, tree initial_value
, bool do_default
)
8164 tree type
, elt_type
;
8166 /* Don't get confused by a CONSTRUCTOR for some other type. */
8167 if (initial_value
&& TREE_CODE (initial_value
) == CONSTRUCTOR
8168 && !BRACE_ENCLOSED_INITIALIZER_P (initial_value
)
8169 && TREE_CODE (TREE_TYPE (initial_value
)) != ARRAY_TYPE
)
8174 unsigned HOST_WIDE_INT i
;
8177 /* An array of character type can be initialized from a
8178 brace-enclosed string constant.
8180 FIXME: this code is duplicated from reshape_init. Probably
8181 we should just call reshape_init here? */
8182 if (char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (*ptype
)))
8183 && TREE_CODE (initial_value
) == CONSTRUCTOR
8184 && !vec_safe_is_empty (CONSTRUCTOR_ELTS (initial_value
)))
8186 vec
<constructor_elt
, va_gc
> *v
= CONSTRUCTOR_ELTS (initial_value
);
8187 tree value
= (*v
)[0].value
;
8189 if (TREE_CODE (value
) == STRING_CST
8190 && v
->length () == 1)
8191 initial_value
= value
;
8194 /* If any of the elements are parameter packs, we can't actually
8195 complete this type now because the array size is dependent. */
8196 if (TREE_CODE (initial_value
) == CONSTRUCTOR
)
8198 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (initial_value
),
8201 if (PACK_EXPANSION_P (value
))
8207 failure
= complete_array_type (ptype
, initial_value
, do_default
);
8209 /* We can create the array before the element type is complete, which
8210 means that we didn't have these two bits set in the original type
8211 either. In completing the type, we are expected to propagate these
8212 bits. See also complete_type which does the same thing for arrays
8215 if (TYPE_DOMAIN (type
))
8217 elt_type
= TREE_TYPE (type
);
8218 TYPE_NEEDS_CONSTRUCTING (type
) = TYPE_NEEDS_CONSTRUCTING (elt_type
);
8219 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type
)
8220 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (elt_type
);
8226 /* As above, but either give an error or reject zero-size arrays, depending
8230 cp_complete_array_type_or_error (tree
*ptype
, tree initial_value
,
8231 bool do_default
, tsubst_flags_t complain
)
8234 bool sfinae
= !(complain
& tf_error
);
8235 /* In SFINAE context we can't be lenient about zero-size arrays. */
8238 failure
= cp_complete_array_type (ptype
, initial_value
, do_default
);
8244 /* Not an error. */;
8245 else if (failure
== 1)
8246 error ("initializer fails to determine size of %qT", *ptype
);
8247 else if (failure
== 2)
8250 error ("array size missing in %qT", *ptype
);
8252 else if (failure
== 3)
8253 error ("zero-size array %qT", *ptype
);
8254 *ptype
= error_mark_node
;
8259 /* Return zero if something is declared to be a member of type
8260 CTYPE when in the context of CUR_TYPE. STRING is the error
8261 message to print in that case. Otherwise, quietly return 1. */
8264 member_function_or_else (tree ctype
, tree cur_type
, enum overload_flags flags
)
8266 if (ctype
&& ctype
!= cur_type
)
8268 if (flags
== DTOR_FLAG
)
8269 error ("destructor for alien class %qT cannot be a member", ctype
);
8271 error ("constructor for alien class %qT cannot be a member", ctype
);
8277 /* Subroutine of `grokdeclarator'. */
8279 /* Generate errors possibly applicable for a given set of specifiers.
8280 This is for ARM $7.1.2. */
8283 bad_specifiers (tree object
,
8284 enum bad_spec_place type
,
8295 error ("%qD declared as a %<virtual%> variable", object
);
8297 error ("%<const%> and %<volatile%> function specifiers on "
8298 "%qD invalid in variable declaration", object
);
8302 error ("%qD declared as a %<virtual%> parameter", object
);
8304 error ("%qD declared as an %<inline%> parameter", object
);
8306 error ("%<const%> and %<volatile%> function specifiers on "
8307 "%qD invalid in parameter declaration", object
);
8311 error ("%qD declared as a %<virtual%> type", object
);
8313 error ("%qD declared as an %<inline%> type", object
);
8315 error ("%<const%> and %<volatile%> function specifiers on "
8316 "%qD invalid in type declaration", object
);
8320 error ("%qD declared as a %<virtual%> field", object
);
8322 error ("%qD declared as an %<inline%> field", object
);
8324 error ("%<const%> and %<volatile%> function specifiers on "
8325 "%qD invalid in field declaration", object
);
8331 error ("%q+D declared as a friend", object
);
8333 && !flag_noexcept_type
8334 && (TREE_CODE (object
) == TYPE_DECL
8335 || (!TYPE_PTRFN_P (TREE_TYPE (object
))
8336 && !TYPE_REFFN_P (TREE_TYPE (object
))
8337 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (object
)))))
8338 error ("%q+D declared with an exception specification", object
);
8341 /* DECL is a member function or static data member and is presently
8342 being defined. Check that the definition is taking place in a
8346 check_class_member_definition_namespace (tree decl
)
8348 /* These checks only apply to member functions and static data
8350 gcc_assert (VAR_OR_FUNCTION_DECL_P (decl
));
8351 /* We check for problems with specializations in pt.c in
8352 check_specialization_namespace, where we can issue better
8354 if (processing_specialization
)
8356 /* We check this in check_explicit_instantiation_namespace. */
8357 if (processing_explicit_instantiation
)
8361 A member function definition that appears outside of the
8362 class definition shall appear in a namespace scope enclosing
8363 the class definition.
8367 The definition for a static data member shall appear in a
8368 namespace scope enclosing the member's class definition. */
8369 if (!is_ancestor (current_namespace
, DECL_CONTEXT (decl
)))
8370 permerror (input_location
, "definition of %qD is not in namespace enclosing %qT",
8371 decl
, DECL_CONTEXT (decl
));
8374 /* Build a PARM_DECL for the "this" parameter. TYPE is the
8375 METHOD_TYPE for a non-static member function; QUALS are the
8376 cv-qualifiers that apply to the function. */
8379 build_this_parm (tree type
, cp_cv_quals quals
)
8384 cp_cv_quals this_quals
;
8386 if (CLASS_TYPE_P (type
))
8389 = cp_build_qualified_type (type
, quals
& ~TYPE_QUAL_RESTRICT
);
8390 this_type
= build_pointer_type (this_type
);
8393 this_type
= type_of_this_parm (type
);
8394 /* The `this' parameter is implicitly `const'; it cannot be
8396 this_quals
= (quals
& TYPE_QUAL_RESTRICT
) | TYPE_QUAL_CONST
;
8397 qual_type
= cp_build_qualified_type (this_type
, this_quals
);
8398 parm
= build_artificial_parm (this_identifier
, qual_type
);
8399 cp_apply_type_quals_to_decl (this_quals
, parm
);
8403 /* DECL is a static member function. Complain if it was declared
8404 with function-cv-quals. */
8407 check_static_quals (tree decl
, cp_cv_quals quals
)
8409 if (quals
!= TYPE_UNQUALIFIED
)
8410 error ("static member function %q#D declared with type qualifiers",
8414 // Check that FN takes no arguments and returns bool.
8416 check_concept_fn (tree fn
)
8418 // A constraint is nullary.
8419 if (DECL_ARGUMENTS (fn
))
8420 error ("concept %q#D declared with function parameters", fn
);
8422 // The declared return type of the concept shall be bool, and
8423 // it shall not be deduced from it definition.
8424 tree type
= TREE_TYPE (TREE_TYPE (fn
));
8426 error ("concept %q#D declared with a deduced return type", fn
);
8427 else if (type
!= boolean_type_node
)
8428 error ("concept %q#D with non-%<bool%> return type %qT", fn
, type
);
8431 /* Helper function. Replace the temporary this parameter injected
8432 during cp_finish_omp_declare_simd with the real this parameter. */
8435 declare_simd_adjust_this (tree
*tp
, int *walk_subtrees
, void *data
)
8437 tree this_parm
= (tree
) data
;
8438 if (TREE_CODE (*tp
) == PARM_DECL
8439 && DECL_NAME (*tp
) == this_identifier
8440 && *tp
!= this_parm
)
8442 else if (TYPE_P (*tp
))
8447 /* CTYPE is class type, or null if non-class.
8448 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
8450 DECLARATOR is the function's name.
8451 PARMS is a chain of PARM_DECLs for the function.
8452 VIRTUALP is truthvalue of whether the function is virtual or not.
8453 FLAGS are to be passed through to `grokclassfn'.
8454 QUALS are qualifiers indicating whether the function is `const'
8456 RAISES is a list of exceptions that this function can raise.
8457 CHECK is 1 if we must find this method in CTYPE, 0 if we should
8458 not look, and -1 if we should not call `grokclassfn' at all.
8460 SFK is the kind of special function (if any) for the new function.
8462 Returns `NULL_TREE' if something goes wrong, after issuing
8463 applicable error messages. */
8466 grokfndecl (tree ctype
,
8470 tree orig_declarator
,
8473 enum overload_flags flags
,
8475 cp_ref_qualifier rqual
,
8482 special_function_kind sfk
,
8487 location_t location
)
8490 int staticp
= ctype
&& TREE_CODE (type
) == FUNCTION_TYPE
;
8493 // Was the concept specifier present?
8494 bool concept_p
= inlinep
& 4;
8496 // Concept declarations must have a corresponding definition.
8497 if (concept_p
&& !funcdef_flag
)
8499 error ("concept %qD has no definition", declarator
);
8504 type
= build_ref_qualified_type (type
, rqual
);
8506 type
= build_exception_variant (type
, raises
);
8508 decl
= build_lang_decl (FUNCTION_DECL
, declarator
, type
);
8510 /* Set the constraints on the declaration. */
8513 tree tmpl_reqs
= NULL_TREE
;
8514 if (processing_template_decl
> template_class_depth (ctype
))
8515 tmpl_reqs
= TEMPLATE_PARMS_CONSTRAINTS (current_template_parms
);
8517 /* Adjust the required expression into a constraint. */
8519 decl_reqs
= normalize_expression (decl_reqs
);
8521 tree ci
= build_constraints (tmpl_reqs
, decl_reqs
);
8522 set_constraints (decl
, ci
);
8525 /* If we have an explicit location, use it, otherwise use whatever
8526 build_lang_decl used (probably input_location). */
8527 if (location
!= UNKNOWN_LOCATION
)
8528 DECL_SOURCE_LOCATION (decl
) = location
;
8530 if (TREE_CODE (type
) == METHOD_TYPE
)
8533 parm
= build_this_parm (type
, quals
);
8534 DECL_CHAIN (parm
) = parms
;
8537 /* Allocate space to hold the vptr bit if needed. */
8538 SET_DECL_ALIGN (decl
, MINIMUM_METHOD_BOUNDARY
);
8540 DECL_ARGUMENTS (decl
) = parms
;
8541 for (t
= parms
; t
; t
= DECL_CHAIN (t
))
8542 DECL_CONTEXT (t
) = decl
;
8543 /* Propagate volatile out from type to decl. */
8544 if (TYPE_VOLATILE (type
))
8545 TREE_THIS_VOLATILE (decl
) = 1;
8547 /* Setup decl according to sfk. */
8550 case sfk_constructor
:
8551 case sfk_copy_constructor
:
8552 case sfk_move_constructor
:
8553 DECL_CONSTRUCTOR_P (decl
) = 1;
8555 case sfk_destructor
:
8556 DECL_DESTRUCTOR_P (decl
) = 1;
8563 && TREE_CODE (orig_declarator
) == TEMPLATE_ID_EXPR
)
8567 ("defining explicit specialization %qD in friend declaration",
8571 tree fns
= TREE_OPERAND (orig_declarator
, 0);
8572 tree args
= TREE_OPERAND (orig_declarator
, 1);
8574 if (PROCESSING_REAL_TEMPLATE_DECL_P ())
8576 /* Something like `template <class T> friend void f<T>()'. */
8577 error ("invalid use of template-id %qD in declaration "
8578 "of primary template",
8584 /* A friend declaration of the form friend void f<>(). Record
8585 the information in the TEMPLATE_ID_EXPR. */
8586 SET_DECL_IMPLICIT_INSTANTIATION (decl
);
8588 gcc_assert (identifier_p (fns
) || TREE_CODE (fns
) == OVERLOAD
);
8589 DECL_TEMPLATE_INFO (decl
) = build_template_info (fns
, args
);
8591 for (t
= TYPE_ARG_TYPES (TREE_TYPE (decl
)); t
; t
= TREE_CHAIN (t
))
8592 if (TREE_PURPOSE (t
)
8593 && TREE_CODE (TREE_PURPOSE (t
)) == DEFAULT_ARG
)
8595 error ("default arguments are not allowed in declaration "
8596 "of friend template specialization %qD",
8603 error ("%<inline%> is not allowed in declaration of friend "
8604 "template specialization %qD",
8611 /* If this decl has namespace scope, set that up. */
8613 set_decl_namespace (decl
, in_namespace
, friendp
);
8615 DECL_CONTEXT (decl
) = FROB_CONTEXT (current_decl_namespace ());
8617 /* `main' and builtins have implicit 'C' linkage. */
8618 if ((MAIN_NAME_P (declarator
)
8619 || (IDENTIFIER_LENGTH (declarator
) > 10
8620 && IDENTIFIER_POINTER (declarator
)[0] == '_'
8621 && IDENTIFIER_POINTER (declarator
)[1] == '_'
8622 && strncmp (IDENTIFIER_POINTER (declarator
)+2, "builtin_", 8) == 0)
8623 || (targetcm
.cxx_implicit_extern_c
8624 && targetcm
.cxx_implicit_extern_c(IDENTIFIER_POINTER (declarator
))))
8625 && current_lang_name
== lang_name_cplusplus
8626 && ctype
== NULL_TREE
8627 && DECL_FILE_SCOPE_P (decl
))
8628 SET_DECL_LANGUAGE (decl
, lang_c
);
8630 /* Should probably propagate const out from type to decl I bet (mrs). */
8633 DECL_STATIC_FUNCTION_P (decl
) = 1;
8634 DECL_CONTEXT (decl
) = ctype
;
8638 DECL_DELETED_FN (decl
) = 1;
8642 DECL_CONTEXT (decl
) = ctype
;
8644 check_class_member_definition_namespace (decl
);
8647 if (ctype
== NULL_TREE
&& DECL_MAIN_P (decl
))
8649 if (PROCESSING_REAL_TEMPLATE_DECL_P())
8650 error ("cannot declare %<::main%> to be a template");
8652 error ("cannot declare %<::main%> to be inline");
8654 error ("cannot declare %<::main%> to be constexpr");
8656 error ("cannot declare %<::main%> to be static");
8661 /* Members of anonymous types and local classes have no linkage; make
8662 them internal. If a typedef is made later, this will be changed. */
8663 if (ctype
&& (!TREE_PUBLIC (TYPE_MAIN_DECL (ctype
))
8664 || decl_function_context (TYPE_MAIN_DECL (ctype
))))
8667 if (publicp
&& cxx_dialect
== cxx98
)
8669 /* [basic.link]: A name with no linkage (notably, the name of a class
8670 or enumeration declared in a local scope) shall not be used to
8671 declare an entity with linkage.
8673 DR 757 relaxes this restriction for C++0x. */
8674 no_linkage_error (decl
);
8677 TREE_PUBLIC (decl
) = publicp
;
8680 DECL_INTERFACE_KNOWN (decl
) = 1;
8681 DECL_NOT_REALLY_EXTERN (decl
) = 1;
8684 /* If the declaration was declared inline, mark it as such. */
8687 DECL_DECLARED_INLINE_P (decl
) = 1;
8689 DECL_COMDAT (decl
) = 1;
8692 DECL_DECLARED_CONSTEXPR_P (decl
) = true;
8694 // If the concept declaration specifier was found, check
8695 // that the declaration satisfies the necessary requirements.
8698 DECL_DECLARED_CONCEPT_P (decl
) = true;
8699 check_concept_fn (decl
);
8702 DECL_EXTERNAL (decl
) = 1;
8703 if (TREE_CODE (type
) == FUNCTION_TYPE
)
8706 TREE_TYPE (decl
) = apply_memfn_quals (TREE_TYPE (decl
),
8713 ? G_("static member function %qD cannot have cv-qualifier")
8714 : G_("non-member function %qD cannot have cv-qualifier"),
8716 quals
= TYPE_UNQUALIFIED
;
8722 ? G_("static member function %qD cannot have ref-qualifier")
8723 : G_("non-member function %qD cannot have ref-qualifier"),
8725 rqual
= REF_QUAL_NONE
;
8729 if (deduction_guide_p (decl
))
8731 if (!DECL_NAMESPACE_SCOPE_P (decl
))
8733 error_at (location
, "deduction guide %qD must be declared at "
8734 "namespace scope", decl
);
8739 "deduction guide %qD must not have a function body", decl
);
8741 else if (IDENTIFIER_OPNAME_P (DECL_NAME (decl
))
8742 && !grok_op_properties (decl
, /*complain=*/true))
8744 else if (UDLIT_OPER_P (DECL_NAME (decl
)))
8746 bool long_long_unsigned_p
;
8748 const char *suffix
= NULL
;
8749 /* [over.literal]/6: Literal operators shall not have C linkage. */
8750 if (DECL_LANGUAGE (decl
) == lang_c
)
8752 error ("literal operator with C linkage");
8756 if (DECL_NAMESPACE_SCOPE_P (decl
))
8758 if (!check_literal_operator_args (decl
, &long_long_unsigned_p
,
8761 error ("%qD has invalid argument list", decl
);
8765 suffix
= UDLIT_OP_SUFFIX (DECL_NAME (decl
));
8766 if (long_long_unsigned_p
)
8768 if (cpp_interpret_int_suffix (parse_in
, suffix
, strlen (suffix
)))
8769 warning (0, "integer suffix %<%s%>"
8770 " shadowed by implementation", suffix
);
8772 else if (long_double_p
)
8774 if (cpp_interpret_float_suffix (parse_in
, suffix
, strlen (suffix
)))
8775 warning (0, "floating point suffix %<%s%>"
8776 " shadowed by implementation", suffix
);
8781 error ("%qD must be a non-member function", decl
);
8787 /* Make the init_value nonzero so pushdecl knows this is not
8788 tentative. error_mark_node is replaced later with the BLOCK. */
8789 DECL_INITIAL (decl
) = error_mark_node
;
8791 if (TYPE_NOTHROW_P (type
) || nothrow_libfn_p (decl
))
8792 TREE_NOTHROW (decl
) = 1;
8794 if (flag_openmp
|| flag_openmp_simd
|| flag_cilkplus
)
8796 /* Adjust "omp declare simd" attributes. */
8797 tree ods
= lookup_attribute ("omp declare simd", *attrlist
);
8801 for (attr
= ods
; attr
;
8802 attr
= lookup_attribute ("omp declare simd", TREE_CHAIN (attr
)))
8804 if (TREE_CODE (type
) == METHOD_TYPE
)
8805 walk_tree (&TREE_VALUE (attr
), declare_simd_adjust_this
,
8806 DECL_ARGUMENTS (decl
), NULL
);
8807 if (TREE_VALUE (attr
) != NULL_TREE
)
8809 tree cl
= TREE_VALUE (TREE_VALUE (attr
));
8810 cl
= c_omp_declare_simd_clauses_to_numbers
8811 (DECL_ARGUMENTS (decl
), cl
);
8813 TREE_VALUE (TREE_VALUE (attr
)) = cl
;
8815 TREE_VALUE (attr
) = NULL_TREE
;
8821 /* Caller will do the rest of this. */
8825 if (ctype
!= NULL_TREE
)
8826 grokclassfn (ctype
, decl
, flags
);
8829 if (cxx_dialect
>= cxx11
8830 && DECL_DESTRUCTOR_P (decl
)
8831 && !TYPE_BEING_DEFINED (DECL_CONTEXT (decl
))
8832 && !processing_template_decl
)
8833 deduce_noexcept_on_destructor (decl
);
8835 decl
= check_explicit_specialization (orig_declarator
, decl
,
8838 4 * (friendp
!= 0) +
8840 if (decl
== error_mark_node
)
8843 if (DECL_STATIC_FUNCTION_P (decl
))
8844 check_static_quals (decl
, quals
);
8848 cplus_decl_attributes (&decl
, *attrlist
, 0);
8849 *attrlist
= NULL_TREE
;
8852 /* Check main's type after attributes have been applied. */
8853 if (ctype
== NULL_TREE
&& DECL_MAIN_P (decl
))
8855 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl
)),
8858 tree oldtypeargs
= TYPE_ARG_TYPES (TREE_TYPE (decl
));
8860 error ("%<::main%> must return %<int%>");
8861 newtype
= build_function_type (integer_type_node
, oldtypeargs
);
8862 TREE_TYPE (decl
) = newtype
;
8865 check_main_parameter_types (decl
);
8868 if (ctype
!= NULL_TREE
&& check
)
8870 tree old_decl
= check_classfn (ctype
, decl
,
8871 (processing_template_decl
8872 > template_class_depth (ctype
))
8873 ? current_template_parms
8876 if (old_decl
== error_mark_node
)
8884 if (TREE_CODE (old_decl
) == TEMPLATE_DECL
)
8885 /* Because grokfndecl is always supposed to return a
8886 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
8887 here. We depend on our callers to figure out that its
8888 really a template that's being returned. */
8889 old_decl
= DECL_TEMPLATE_RESULT (old_decl
);
8891 if (DECL_STATIC_FUNCTION_P (old_decl
)
8892 && TREE_CODE (TREE_TYPE (decl
)) == METHOD_TYPE
)
8894 /* Remove the `this' parm added by grokclassfn. */
8895 revert_static_member_fn (decl
);
8896 check_static_quals (decl
, quals
);
8898 if (DECL_ARTIFICIAL (old_decl
))
8900 error ("definition of implicitly-declared %qD", old_decl
);
8903 else if (DECL_DEFAULTED_FN (old_decl
))
8905 error ("definition of explicitly-defaulted %q+D", decl
);
8906 inform (DECL_SOURCE_LOCATION (old_decl
),
8907 "%q#D explicitly defaulted here", old_decl
);
8911 /* Since we've smashed OLD_DECL to its
8912 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
8913 if (TREE_CODE (decl
) == TEMPLATE_DECL
)
8914 decl
= DECL_TEMPLATE_RESULT (decl
);
8916 /* Attempt to merge the declarations. This can fail, in
8917 the case of some invalid specialization declarations. */
8918 pushed_scope
= push_scope (ctype
);
8919 ok
= duplicate_decls (decl
, old_decl
, friendp
);
8921 pop_scope (pushed_scope
);
8924 error ("no %q#D member function declared in class %qT",
8928 if (ok
== error_mark_node
)
8934 if (DECL_CONSTRUCTOR_P (decl
) && !grok_ctor_properties (ctype
, decl
))
8937 if (ctype
== NULL_TREE
|| check
)
8941 DECL_VIRTUAL_P (decl
) = 1;
8946 /* decl is a FUNCTION_DECL.
8947 specifiers are the parsed virt-specifiers.
8949 Set flags to reflect the virt-specifiers.
8954 set_virt_specifiers (tree decl
, cp_virt_specifiers specifiers
)
8956 if (decl
== NULL_TREE
)
8958 if (specifiers
& VIRT_SPEC_OVERRIDE
)
8959 DECL_OVERRIDE_P (decl
) = 1;
8960 if (specifiers
& VIRT_SPEC_FINAL
)
8961 DECL_FINAL_P (decl
) = 1;
8965 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
8966 the linkage that DECL will receive in the object file. */
8969 set_linkage_for_static_data_member (tree decl
)
8971 /* A static data member always has static storage duration and
8972 external linkage. Note that static data members are forbidden in
8973 local classes -- the only situation in which a class has
8974 non-external linkage. */
8975 TREE_PUBLIC (decl
) = 1;
8976 TREE_STATIC (decl
) = 1;
8977 /* For non-template classes, static data members are always put
8978 out in exactly those files where they are defined, just as
8979 with ordinary namespace-scope variables. */
8980 if (!processing_template_decl
)
8981 DECL_INTERFACE_KNOWN (decl
) = 1;
8984 /* Create a VAR_DECL named NAME with the indicated TYPE.
8986 If SCOPE is non-NULL, it is the class type or namespace containing
8987 the variable. If SCOPE is NULL, the variable should is created in
8988 the innermost enclosing scope. */
8991 grokvardecl (tree type
,
8993 tree orig_declarator
,
8994 const cp_decl_specifier_seq
*declspecs
,
9003 tree explicit_scope
;
9005 gcc_assert (!name
|| identifier_p (name
));
9007 bool constp
= (type_quals
& TYPE_QUAL_CONST
) != 0;
9008 bool volatilep
= (type_quals
& TYPE_QUAL_VOLATILE
) != 0;
9010 /* Compute the scope in which to place the variable, but remember
9011 whether or not that scope was explicitly specified by the user. */
9012 explicit_scope
= scope
;
9015 /* An explicit "extern" specifier indicates a namespace-scope
9017 if (declspecs
->storage_class
== sc_extern
)
9018 scope
= current_decl_namespace ();
9019 else if (!at_function_scope_p ())
9020 scope
= current_scope ();
9024 && (/* If the variable is a namespace-scope variable declared in a
9025 template, we need DECL_LANG_SPECIFIC. */
9026 (TREE_CODE (scope
) == NAMESPACE_DECL
&& processing_template_decl
)
9027 /* Similarly for namespace-scope variables with language linkage
9029 || (TREE_CODE (scope
) == NAMESPACE_DECL
9030 && current_lang_name
!= lang_name_cplusplus
)
9031 /* Similarly for static data members. */
9033 /* Similarly for explicit specializations. */
9035 && TREE_CODE (orig_declarator
) == TEMPLATE_ID_EXPR
)))
9036 decl
= build_lang_decl (VAR_DECL
, name
, type
);
9038 decl
= build_decl (input_location
, VAR_DECL
, name
, type
);
9040 if (explicit_scope
&& TREE_CODE (explicit_scope
) == NAMESPACE_DECL
)
9041 set_decl_namespace (decl
, explicit_scope
, 0);
9043 DECL_CONTEXT (decl
) = FROB_CONTEXT (scope
);
9045 if (declspecs
->storage_class
== sc_extern
)
9047 DECL_THIS_EXTERN (decl
) = 1;
9048 DECL_EXTERNAL (decl
) = !initialized
;
9051 if (DECL_CLASS_SCOPE_P (decl
))
9053 set_linkage_for_static_data_member (decl
);
9054 /* This function is only called with out-of-class definitions. */
9055 DECL_EXTERNAL (decl
) = 0;
9056 check_class_member_definition_namespace (decl
);
9058 /* At top level, either `static' or no s.c. makes a definition
9059 (perhaps tentative), and absence of `static' makes it public. */
9060 else if (toplevel_bindings_p ())
9062 TREE_PUBLIC (decl
) = (declspecs
->storage_class
!= sc_static
9063 && (DECL_THIS_EXTERN (decl
)
9067 TREE_STATIC (decl
) = ! DECL_EXTERNAL (decl
);
9069 /* Not at top level, only `static' makes a static definition. */
9072 TREE_STATIC (decl
) = declspecs
->storage_class
== sc_static
;
9073 TREE_PUBLIC (decl
) = DECL_EXTERNAL (decl
);
9076 if (decl_spec_seq_has_spec_p (declspecs
, ds_thread
))
9078 if (DECL_EXTERNAL (decl
) || TREE_STATIC (decl
))
9080 CP_DECL_THREAD_LOCAL_P (decl
) = true;
9081 if (!processing_template_decl
)
9082 set_decl_tls_model (decl
, decl_default_tls_model (decl
));
9084 if (declspecs
->gnu_thread_keyword_p
)
9085 SET_DECL_GNU_TLS_P (decl
);
9088 /* If the type of the decl has no linkage, make sure that we'll
9089 notice that in mark_used. */
9090 if (cxx_dialect
> cxx98
9091 && decl_linkage (decl
) != lk_none
9092 && DECL_LANG_SPECIFIC (decl
) == NULL
9093 && !DECL_EXTERN_C_P (decl
)
9094 && no_linkage_check (TREE_TYPE (decl
), /*relaxed_p=*/false))
9095 retrofit_lang_decl (decl
);
9097 if (TREE_PUBLIC (decl
))
9099 /* [basic.link]: A name with no linkage (notably, the name of a class
9100 or enumeration declared in a local scope) shall not be used to
9101 declare an entity with linkage.
9103 DR 757 relaxes this restriction for C++0x. */
9104 if (cxx_dialect
< cxx11
)
9105 no_linkage_error (decl
);
9108 DECL_INTERFACE_KNOWN (decl
) = 1;
9110 if (DECL_NAME (decl
)
9111 && MAIN_NAME_P (DECL_NAME (decl
))
9112 && scope
== global_namespace
)
9113 error ("cannot declare %<::main%> to be a global variable");
9115 /* Check that the variable can be safely declared as a concept.
9116 Note that this also forbids explicit specializations. */
9119 if (!processing_template_decl
)
9121 error ("a non-template variable cannot be %<concept%>");
9125 DECL_DECLARED_CONCEPT_P (decl
) = true;
9126 if (!same_type_ignoring_top_level_qualifiers_p (type
, boolean_type_node
))
9127 error_at (declspecs
->locations
[ds_type_spec
],
9128 "concept must have type %<bool%>");
9130 else if (flag_concepts
9131 && processing_template_decl
> template_class_depth (scope
))
9133 tree reqs
= TEMPLATE_PARMS_CONSTRAINTS (current_template_parms
);
9134 tree ci
= build_constraints (reqs
, NULL_TREE
);
9135 set_constraints (decl
, ci
);
9138 // Handle explicit specializations and instantiations of variable templates.
9139 if (orig_declarator
)
9140 decl
= check_explicit_specialization (orig_declarator
, decl
,
9141 template_count
, conceptp
* 8);
9143 return decl
!= error_mark_node
? decl
: NULL_TREE
;
9146 /* Create and return a canonical pointer to member function type, for
9147 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
9150 build_ptrmemfunc_type (tree type
)
9155 if (type
== error_mark_node
)
9158 /* Make sure that we always have the unqualified pointer-to-member
9160 if (cp_cv_quals quals
= cp_type_quals (type
))
9162 tree unqual
= build_ptrmemfunc_type (TYPE_MAIN_VARIANT (type
));
9163 return cp_build_qualified_type (unqual
, quals
);
9166 /* If a canonical type already exists for this type, use it. We use
9167 this method instead of type_hash_canon, because it only does a
9168 simple equality check on the list of field members. */
9170 if ((t
= TYPE_GET_PTRMEMFUNC_TYPE (type
)))
9173 t
= make_node (RECORD_TYPE
);
9175 /* Let the front end know this is a pointer to member function. */
9176 TYPE_PTRMEMFUNC_FLAG (t
) = 1;
9178 field
= build_decl (input_location
, FIELD_DECL
, pfn_identifier
, type
);
9181 field
= build_decl (input_location
, FIELD_DECL
, delta_identifier
,
9183 DECL_CHAIN (field
) = fields
;
9186 finish_builtin_struct (t
, "__ptrmemfunc_type", fields
, ptr_type_node
);
9188 /* Zap out the name so that the back end will give us the debugging
9189 information for this anonymous RECORD_TYPE. */
9190 TYPE_NAME (t
) = NULL_TREE
;
9192 /* Cache this pointer-to-member type so that we can find it again
9194 TYPE_SET_PTRMEMFUNC_TYPE (type
, t
);
9196 if (TYPE_STRUCTURAL_EQUALITY_P (type
))
9197 SET_TYPE_STRUCTURAL_EQUALITY (t
);
9198 else if (TYPE_CANONICAL (type
) != type
)
9199 TYPE_CANONICAL (t
) = build_ptrmemfunc_type (TYPE_CANONICAL (type
));
9204 /* Create and return a pointer to data member type. */
9207 build_ptrmem_type (tree class_type
, tree member_type
)
9209 if (TREE_CODE (member_type
) == METHOD_TYPE
)
9211 cp_cv_quals quals
= type_memfn_quals (member_type
);
9212 cp_ref_qualifier rqual
= type_memfn_rqual (member_type
);
9213 member_type
= build_memfn_type (member_type
, class_type
, quals
, rqual
);
9214 return build_ptrmemfunc_type (build_pointer_type (member_type
));
9218 gcc_assert (TREE_CODE (member_type
) != FUNCTION_TYPE
);
9219 return build_offset_type (class_type
, member_type
);
9223 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
9224 Check to see that the definition is valid. Issue appropriate error
9225 messages. Return 1 if the definition is particularly bad, or 0
9229 check_static_variable_definition (tree decl
, tree type
)
9231 /* Avoid redundant diagnostics on out-of-class definitions. */
9232 if (!current_class_type
|| !TYPE_BEING_DEFINED (current_class_type
))
9234 /* Can't check yet if we don't know the type. */
9235 if (dependent_type_p (type
))
9237 /* If DECL is declared constexpr, we'll do the appropriate checks
9238 in check_initializer. Similarly for inline static data members. */
9240 && (DECL_DECLARED_CONSTEXPR_P (decl
)
9241 || DECL_VAR_DECLARED_INLINE_P (decl
)))
9243 else if (cxx_dialect
>= cxx11
&& !INTEGRAL_OR_ENUMERATION_TYPE_P (type
))
9245 if (!COMPLETE_TYPE_P (type
))
9246 error_at (DECL_SOURCE_LOCATION (decl
),
9247 "in-class initialization of static data member %q#D of "
9248 "incomplete type", decl
);
9249 else if (literal_type_p (type
))
9250 permerror (DECL_SOURCE_LOCATION (decl
),
9251 "%<constexpr%> needed for in-class initialization of "
9252 "static data member %q#D of non-integral type", decl
);
9254 error_at (DECL_SOURCE_LOCATION (decl
),
9255 "in-class initialization of static data member %q#D of "
9256 "non-literal type", decl
);
9260 /* Motion 10 at San Diego: If a static const integral data member is
9261 initialized with an integral constant expression, the initializer
9262 may appear either in the declaration (within the class), or in
9263 the definition, but not both. If it appears in the class, the
9264 member is a member constant. The file-scope definition is always
9266 if (!ARITHMETIC_TYPE_P (type
) && TREE_CODE (type
) != ENUMERAL_TYPE
)
9268 error_at (DECL_SOURCE_LOCATION (decl
),
9269 "invalid in-class initialization of static data member "
9270 "of non-integral type %qT",
9274 else if (!CP_TYPE_CONST_P (type
))
9275 error_at (DECL_SOURCE_LOCATION (decl
),
9276 "ISO C++ forbids in-class initialization of non-const "
9277 "static member %qD",
9279 else if (!INTEGRAL_OR_ENUMERATION_TYPE_P (type
))
9280 pedwarn (DECL_SOURCE_LOCATION (decl
), OPT_Wpedantic
,
9281 "ISO C++ forbids initialization of member constant "
9282 "%qD of non-integral type %qT", decl
, type
);
9287 /* *expr_p is part of the TYPE_SIZE of a variably-sized array. If any
9288 SAVE_EXPRs in *expr_p wrap expressions with side-effects, break those
9289 expressions out into temporary variables so that walk_tree doesn't
9290 step into them (c++/15764). */
9293 stabilize_save_expr_r (tree
*expr_p
, int *walk_subtrees
, void *data
)
9295 hash_set
<tree
> *pset
= (hash_set
<tree
> *)data
;
9296 tree expr
= *expr_p
;
9297 if (TREE_CODE (expr
) == SAVE_EXPR
)
9299 tree op
= TREE_OPERAND (expr
, 0);
9300 cp_walk_tree (&op
, stabilize_save_expr_r
, data
, pset
);
9301 if (TREE_SIDE_EFFECTS (op
))
9302 TREE_OPERAND (expr
, 0) = get_temp_regvar (TREE_TYPE (op
), op
);
9305 else if (!EXPR_P (expr
) || !TREE_SIDE_EFFECTS (expr
))
9310 /* Entry point for the above. */
9313 stabilize_vla_size (tree size
)
9315 hash_set
<tree
> pset
;
9316 /* Break out any function calls into temporary variables. */
9317 cp_walk_tree (&size
, stabilize_save_expr_r
, &pset
, &pset
);
9320 /* Reduce a SIZEOF_EXPR to its value. */
9323 fold_sizeof_expr (tree t
)
9326 if (SIZEOF_EXPR_TYPE_P (t
))
9327 r
= cxx_sizeof_or_alignof_type (TREE_TYPE (TREE_OPERAND (t
, 0)),
9328 SIZEOF_EXPR
, false);
9329 else if (TYPE_P (TREE_OPERAND (t
, 0)))
9330 r
= cxx_sizeof_or_alignof_type (TREE_OPERAND (t
, 0), SIZEOF_EXPR
,
9333 r
= cxx_sizeof_or_alignof_expr (TREE_OPERAND (t
, 0), SIZEOF_EXPR
,
9335 if (r
== error_mark_node
)
9340 /* Given the SIZE (i.e., number of elements) in an array, compute
9341 an appropriate index type for the array. If non-NULL, NAME is
9342 the name of the entity being declared. */
9345 compute_array_index_type (tree name
, tree size
, tsubst_flags_t complain
)
9350 if (error_operand_p (size
))
9351 return error_mark_node
;
9353 if (!type_dependent_expression_p (size
))
9355 tree type
= TREE_TYPE (size
);
9357 mark_rvalue_use (size
);
9359 if (cxx_dialect
< cxx11
&& TREE_CODE (size
) == NOP_EXPR
9360 && TREE_SIDE_EFFECTS (size
))
9361 /* In C++98, we mark a non-constant array bound with a magic
9362 NOP_EXPR with TREE_SIDE_EFFECTS; don't fold in that case. */;
9365 size
= instantiate_non_dependent_expr_sfinae (size
, complain
);
9367 if (CLASS_TYPE_P (type
)
9368 && CLASSTYPE_LITERAL_P (type
))
9370 size
= build_expr_type_conversion (WANT_INT
, size
, true);
9373 if (!(complain
& tf_error
))
9374 return error_mark_node
;
9376 error ("size of array %qD has non-integral type %qT",
9379 error ("size of array has non-integral type %qT", type
);
9380 size
= integer_one_node
;
9382 if (size
== error_mark_node
)
9383 return error_mark_node
;
9384 type
= TREE_TYPE (size
);
9387 if (INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type
))
9388 size
= maybe_constant_value (size
);
9390 if (!TREE_CONSTANT (size
))
9394 if (error_operand_p (size
))
9395 return error_mark_node
;
9397 /* The array bound must be an integer type. */
9398 if (!INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type
))
9400 if (!(complain
& tf_error
))
9401 return error_mark_node
;
9403 error ("size of array %qD has non-integral type %qT", name
, type
);
9405 error ("size of array has non-integral type %qT", type
);
9406 size
= integer_one_node
;
9407 type
= TREE_TYPE (size
);
9411 /* A type is dependent if it is...an array type constructed from any
9412 dependent type or whose size is specified by a constant expression
9413 that is value-dependent. */
9414 /* We can only call value_dependent_expression_p on integral constant
9415 expressions; treat non-constant expressions as dependent, too. */
9416 if (processing_template_decl
9417 && (type_dependent_expression_p (size
)
9418 || !TREE_CONSTANT (size
) || value_dependent_expression_p (size
)))
9420 /* We cannot do any checking for a SIZE that isn't known to be
9421 constant. Just build the index type and mark that it requires
9422 structural equality checks. */
9423 itype
= build_index_type (build_min (MINUS_EXPR
, sizetype
,
9424 size
, size_one_node
));
9425 TYPE_DEPENDENT_P (itype
) = 1;
9426 TYPE_DEPENDENT_P_VALID (itype
) = 1;
9427 SET_TYPE_STRUCTURAL_EQUALITY (itype
);
9431 if (TREE_CODE (size
) != INTEGER_CST
)
9433 tree folded
= cp_fully_fold (size
);
9434 if (TREE_CODE (folded
) == INTEGER_CST
)
9435 pedwarn (location_of (size
), OPT_Wpedantic
,
9436 "size of array is not an integral constant-expression");
9437 /* Use the folded result for VLAs, too; it will have resolved
9442 /* Normally, the array-bound will be a constant. */
9443 if (TREE_CODE (size
) == INTEGER_CST
)
9445 /* Check to see if the array bound overflowed. Make that an
9446 error, no matter how generous we're being. */
9447 constant_expression_error (size
);
9449 /* An array must have a positive number of elements. */
9450 if (tree_int_cst_lt (size
, integer_zero_node
))
9452 if (!(complain
& tf_error
))
9453 return error_mark_node
;
9455 error ("size of array %qD is negative", name
);
9457 error ("size of array is negative");
9458 size
= integer_one_node
;
9460 /* As an extension we allow zero-sized arrays. */
9461 else if (integer_zerop (size
))
9463 if (!(complain
& tf_error
))
9464 /* We must fail if performing argument deduction (as
9465 indicated by the state of complain), so that
9466 another substitution can be found. */
9467 return error_mark_node
;
9468 else if (in_system_header_at (input_location
))
9469 /* Allow them in system headers because glibc uses them. */;
9471 pedwarn (input_location
, OPT_Wpedantic
, "ISO C++ forbids zero-size array %qD", name
);
9473 pedwarn (input_location
, OPT_Wpedantic
, "ISO C++ forbids zero-size array");
9476 else if (TREE_CONSTANT (size
)
9477 /* We don't allow VLAs at non-function scopes, or during
9478 tentative template substitution. */
9479 || !at_function_scope_p ()
9480 || !(complain
& tf_error
))
9482 if (!(complain
& tf_error
))
9483 return error_mark_node
;
9484 /* `(int) &fn' is not a valid array bound. */
9486 error ("size of array %qD is not an integral constant-expression",
9489 error ("size of array is not an integral constant-expression");
9490 size
= integer_one_node
;
9492 else if (pedantic
&& warn_vla
!= 0)
9495 pedwarn (input_location
, OPT_Wvla
, "ISO C++ forbids variable length array %qD", name
);
9497 pedwarn (input_location
, OPT_Wvla
, "ISO C++ forbids variable length array");
9499 else if (warn_vla
> 0)
9503 "variable length array %qD is used", name
);
9506 "variable length array is used");
9509 if (processing_template_decl
&& !TREE_CONSTANT (size
))
9510 /* A variable sized array. */
9511 itype
= build_min (MINUS_EXPR
, sizetype
, size
, integer_one_node
);
9514 HOST_WIDE_INT saved_processing_template_decl
;
9516 /* Compute the index of the largest element in the array. It is
9517 one less than the number of elements in the array. We save
9518 and restore PROCESSING_TEMPLATE_DECL so that computations in
9519 cp_build_binary_op will be appropriately folded. */
9520 saved_processing_template_decl
= processing_template_decl
;
9521 processing_template_decl
= 0;
9522 itype
= cp_build_binary_op (input_location
,
9524 cp_convert (ssizetype
, size
, complain
),
9525 cp_convert (ssizetype
, integer_one_node
,
9528 itype
= maybe_constant_value (itype
);
9529 processing_template_decl
= saved_processing_template_decl
;
9531 if (!TREE_CONSTANT (itype
))
9533 /* A variable sized array. */
9534 itype
= variable_size (itype
);
9536 stabilize_vla_size (itype
);
9538 if (flag_sanitize
& SANITIZE_VLA
9539 && do_ubsan_in_current_function ())
9541 /* We have to add 1 -- in the ubsan routine we generate
9542 LE_EXPR rather than LT_EXPR. */
9543 tree t
= fold_build2 (PLUS_EXPR
, TREE_TYPE (itype
), itype
,
9544 build_one_cst (TREE_TYPE (itype
)));
9545 t
= ubsan_instrument_vla (input_location
, t
);
9546 finish_expr_stmt (t
);
9549 /* Make sure that there was no overflow when creating to a signed
9550 index type. (For example, on a 32-bit machine, an array with
9551 size 2^32 - 1 is too big.) */
9552 else if (TREE_CODE (itype
) == INTEGER_CST
9553 && TREE_OVERFLOW (itype
))
9555 if (!(complain
& tf_error
))
9556 return error_mark_node
;
9557 error ("overflow in array dimension");
9558 TREE_OVERFLOW (itype
) = 0;
9562 /* Create and return the appropriate index type. */
9563 itype
= build_index_type (itype
);
9565 /* If the index type were dependent, we would have returned early, so
9566 remember that it isn't. */
9567 TYPE_DEPENDENT_P (itype
) = 0;
9568 TYPE_DEPENDENT_P_VALID (itype
) = 1;
9572 /* Returns the scope (if any) in which the entity declared by
9573 DECLARATOR will be located. If the entity was declared with an
9574 unqualified name, NULL_TREE is returned. */
9577 get_scope_of_declarator (const cp_declarator
*declarator
)
9579 while (declarator
&& declarator
->kind
!= cdk_id
)
9580 declarator
= declarator
->declarator
;
9582 /* If the declarator-id is a SCOPE_REF, the scope in which the
9583 declaration occurs is the first operand. */
9585 && declarator
->u
.id
.qualifying_scope
)
9586 return declarator
->u
.id
.qualifying_scope
;
9588 /* Otherwise, the declarator is not a qualified name; the entity will
9589 be declared in the current scope. */
9593 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
9594 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
9598 create_array_type_for_decl (tree name
, tree type
, tree size
)
9600 tree itype
= NULL_TREE
;
9602 /* If things have already gone awry, bail now. */
9603 if (type
== error_mark_node
|| size
== error_mark_node
)
9604 return error_mark_node
;
9606 /* 8.3.4/1: If the type of the identifier of D contains the auto
9607 type-specifier, the program is ill-formed. */
9608 if (type_uses_auto (type
))
9610 error ("%qD declared as array of %qT", name
, type
);
9611 return error_mark_node
;
9614 /* If there are some types which cannot be array elements,
9615 issue an error-message and return. */
9616 switch (TREE_CODE (type
))
9620 error ("declaration of %qD as array of void", name
);
9622 error ("creating array of void");
9623 return error_mark_node
;
9627 error ("declaration of %qD as array of functions", name
);
9629 error ("creating array of functions");
9630 return error_mark_node
;
9632 case REFERENCE_TYPE
:
9634 error ("declaration of %qD as array of references", name
);
9636 error ("creating array of references");
9637 return error_mark_node
;
9641 error ("declaration of %qD as array of function members", name
);
9643 error ("creating array of function members");
9644 return error_mark_node
;
9652 The constant expressions that specify the bounds of the arrays
9653 can be omitted only for the first member of the sequence. */
9654 if (TREE_CODE (type
) == ARRAY_TYPE
&& !TYPE_DOMAIN (type
))
9657 error ("declaration of %qD as multidimensional array must "
9658 "have bounds for all dimensions except the first",
9661 error ("multidimensional array must have bounds for all "
9662 "dimensions except the first");
9664 return error_mark_node
;
9667 /* Figure out the index type for the array. */
9669 itype
= compute_array_index_type (name
, size
, tf_warning_or_error
);
9672 T is called the array element type; this type shall not be [...] an
9673 abstract class type. */
9674 abstract_virtuals_error (name
, type
);
9676 return build_cplus_array_type (type
, itype
);
9679 /* Returns the smallest location != UNKNOWN_LOCATION among the
9680 three stored in LOCATIONS[ds_const], LOCATIONS[ds_volatile],
9681 and LOCATIONS[ds_restrict]. */
9684 smallest_type_quals_location (int type_quals
, const location_t
* locations
)
9686 location_t loc
= UNKNOWN_LOCATION
;
9688 if (type_quals
& TYPE_QUAL_CONST
)
9689 loc
= locations
[ds_const
];
9691 if ((type_quals
& TYPE_QUAL_VOLATILE
)
9692 && (loc
== UNKNOWN_LOCATION
|| locations
[ds_volatile
] < loc
))
9693 loc
= locations
[ds_volatile
];
9695 if ((type_quals
& TYPE_QUAL_RESTRICT
)
9696 && (loc
== UNKNOWN_LOCATION
|| locations
[ds_restrict
] < loc
))
9697 loc
= locations
[ds_restrict
];
9702 /* Check that it's OK to declare a function with the indicated TYPE
9703 and TYPE_QUALS. SFK indicates the kind of special function (if any)
9704 that this function is. OPTYPE is the type given in a conversion
9705 operator declaration, or the class type for a constructor/destructor.
9706 Returns the actual return type of the function; that may be different
9707 than TYPE if an error occurs, or for certain special functions. */
9710 check_special_function_return_type (special_function_kind sfk
,
9714 const location_t
* locations
)
9718 case sfk_constructor
:
9720 error ("return type specification for constructor invalid");
9721 else if (type_quals
!= TYPE_UNQUALIFIED
)
9722 error_at (smallest_type_quals_location (type_quals
, locations
),
9723 "qualifiers are not allowed on constructor declaration");
9725 if (targetm
.cxx
.cdtor_returns_this ())
9726 type
= build_pointer_type (optype
);
9728 type
= void_type_node
;
9731 case sfk_destructor
:
9733 error ("return type specification for destructor invalid");
9734 else if (type_quals
!= TYPE_UNQUALIFIED
)
9735 error_at (smallest_type_quals_location (type_quals
, locations
),
9736 "qualifiers are not allowed on destructor declaration");
9738 /* We can't use the proper return type here because we run into
9739 problems with ambiguous bases and covariant returns. */
9740 if (targetm
.cxx
.cdtor_returns_this ())
9741 type
= build_pointer_type (void_type_node
);
9743 type
= void_type_node
;
9746 case sfk_conversion
:
9748 error ("return type specified for %<operator %T%>", optype
);
9749 else if (type_quals
!= TYPE_UNQUALIFIED
)
9750 error_at (smallest_type_quals_location (type_quals
, locations
),
9751 "qualifiers are not allowed on declaration of "
9752 "%<operator %T%>", optype
);
9757 case sfk_deduction_guide
:
9759 error ("return type specified for deduction guide");
9760 else if (type_quals
!= TYPE_UNQUALIFIED
)
9761 error_at (smallest_type_quals_location (type_quals
, locations
),
9762 "qualifiers are not allowed on declaration of "
9764 type
= make_template_placeholder (CLASSTYPE_TI_TEMPLATE (optype
));
9765 for (int i
= 0; i
< ds_last
; ++i
)
9766 if (i
!= ds_explicit
&& locations
[i
])
9767 error_at (locations
[i
],
9768 "decl-specifier in declaration of deduction guide");
9778 /* A variable or data member (whose unqualified name is IDENTIFIER)
9779 has been declared with the indicated TYPE. If the TYPE is not
9780 acceptable, issue an error message and return a type to use for
9781 error-recovery purposes. */
9784 check_var_type (tree identifier
, tree type
)
9786 if (VOID_TYPE_P (type
))
9789 error ("unnamed variable or field declared void");
9790 else if (identifier_p (identifier
))
9792 gcc_assert (!IDENTIFIER_OPNAME_P (identifier
));
9793 error ("variable or field %qE declared void", identifier
);
9796 error ("variable or field declared void");
9797 type
= error_mark_node
;
9803 /* Handle declaring DECL as an inline variable. */
9806 mark_inline_variable (tree decl
)
9808 bool inlinep
= true;
9809 if (! toplevel_bindings_p ())
9811 error ("%<inline%> specifier invalid for variable "
9812 "%qD declared at block scope", decl
);
9815 else if (cxx_dialect
< cxx1z
)
9816 pedwarn (DECL_SOURCE_LOCATION (decl
), 0,
9817 "inline variables are only available "
9818 "with -std=c++1z or -std=gnu++1z");
9821 retrofit_lang_decl (decl
);
9822 SET_DECL_VAR_DECLARED_INLINE_P (decl
);
9826 /* Given declspecs and a declarator (abstract or otherwise), determine
9827 the name and type of the object declared and construct a DECL node
9830 DECLSPECS points to the representation of declaration-specifier
9831 sequence that precedes declarator.
9833 DECL_CONTEXT says which syntactic context this declaration is in:
9834 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
9835 FUNCDEF for a function definition. Like NORMAL but a few different
9836 error messages in each case. Return value may be zero meaning
9837 this definition is too screwy to try to parse.
9838 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
9839 handle member functions (which have FIELD context).
9840 Return value may be zero meaning this definition is too screwy to
9842 PARM for a parameter declaration (either within a function prototype
9843 or before a function body). Make a PARM_DECL, or return void_type_node.
9844 TPARM for a template parameter declaration.
9845 CATCHPARM for a parameter declaration before a catch clause.
9846 TYPENAME if for a typename (in a cast or sizeof).
9847 Don't make a DECL node; just return the ..._TYPE node.
9848 FIELD for a struct or union field; make a FIELD_DECL.
9849 BITFIELD for a field with specified width.
9851 INITIALIZED is as for start_decl.
9853 ATTRLIST is a pointer to the list of attributes, which may be NULL
9854 if there are none; *ATTRLIST may be modified if attributes from inside
9855 the declarator should be applied to the declaration.
9857 When this function is called, scoping variables (such as
9858 CURRENT_CLASS_TYPE) should reflect the scope in which the
9859 declaration occurs, not the scope in which the new declaration will
9860 be placed. For example, on:
9864 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
9867 Returns a DECL (if a declarator is present), a TYPE (if there is no
9868 declarator, in cases like "struct S;"), or the ERROR_MARK_NODE if an
9872 grokdeclarator (const cp_declarator
*declarator
,
9873 cp_decl_specifier_seq
*declspecs
,
9874 enum decl_context decl_context
,
9878 tree type
= NULL_TREE
;
9880 int explicit_intN
= 0;
9881 int virtualp
, explicitp
, friendp
, inlinep
, staticp
;
9882 int explicit_int
= 0;
9883 int explicit_char
= 0;
9884 int defaulted_int
= 0;
9886 tree typedef_decl
= NULL_TREE
;
9887 const char *name
= NULL
;
9888 tree typedef_type
= NULL_TREE
;
9889 /* True if this declarator is a function definition. */
9890 bool funcdef_flag
= false;
9891 cp_declarator_kind innermost_code
= cdk_error
;
9894 /* See the code below that used this. */
9895 tree decl_attr
= NULL_TREE
;
9898 /* Keep track of what sort of function is being processed
9899 so that we can warn about default return values, or explicit
9900 return values which do not match prescribed defaults. */
9901 special_function_kind sfk
= sfk_none
;
9903 tree dname
= NULL_TREE
;
9904 tree ctor_return_type
= NULL_TREE
;
9905 enum overload_flags flags
= NO_SPECIAL
;
9906 /* cv-qualifiers that apply to the declarator, for a declaration of
9907 a member function. */
9908 cp_cv_quals memfn_quals
= TYPE_UNQUALIFIED
;
9909 /* virt-specifiers that apply to the declarator, for a declaration of
9910 a member function. */
9911 cp_virt_specifiers virt_specifiers
= VIRT_SPEC_UNSPECIFIED
;
9912 /* ref-qualifier that applies to the declarator, for a declaration of
9913 a member function. */
9914 cp_ref_qualifier rqual
= REF_QUAL_NONE
;
9915 /* cv-qualifiers that apply to the type specified by the DECLSPECS. */
9916 int type_quals
= TYPE_UNQUALIFIED
;
9917 tree raises
= NULL_TREE
;
9918 int template_count
= 0;
9919 tree returned_attrs
= NULL_TREE
;
9920 tree parms
= NULL_TREE
;
9921 const cp_declarator
*id_declarator
;
9922 /* The unqualified name of the declarator; either an
9923 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
9924 tree unqualified_id
;
9925 /* The class type, if any, in which this entity is located,
9926 or NULL_TREE if none. Note that this value may be different from
9927 the current class type; for example if an attempt is made to declare
9928 "A::f" inside "B", this value will be "A". */
9929 tree ctype
= current_class_type
;
9930 /* The NAMESPACE_DECL for the namespace in which this entity is
9931 located. If an unqualified name is used to declare the entity,
9932 this value will be NULL_TREE, even if the entity is located at
9934 tree in_namespace
= NULL_TREE
;
9935 cp_storage_class storage_class
;
9936 bool unsigned_p
, signed_p
, short_p
, long_p
, thread_p
;
9937 bool type_was_error_mark_node
= false;
9938 bool parameter_pack_p
= declarator
? declarator
->parameter_pack_p
: false;
9939 bool template_type_arg
= false;
9940 bool template_parm_flag
= false;
9941 bool typedef_p
= decl_spec_seq_has_spec_p (declspecs
, ds_typedef
);
9942 bool constexpr_p
= decl_spec_seq_has_spec_p (declspecs
, ds_constexpr
);
9943 bool late_return_type_p
= false;
9944 bool array_parameter_p
= false;
9945 source_location saved_loc
= input_location
;
9946 tree reqs
= NULL_TREE
;
9948 signed_p
= decl_spec_seq_has_spec_p (declspecs
, ds_signed
);
9949 unsigned_p
= decl_spec_seq_has_spec_p (declspecs
, ds_unsigned
);
9950 short_p
= decl_spec_seq_has_spec_p (declspecs
, ds_short
);
9951 long_p
= decl_spec_seq_has_spec_p (declspecs
, ds_long
);
9952 longlong
= decl_spec_seq_has_spec_p (declspecs
, ds_long_long
);
9953 explicit_intN
= declspecs
->explicit_intN_p
;
9954 thread_p
= decl_spec_seq_has_spec_p (declspecs
, ds_thread
);
9956 // Was concept_p specified? Note that ds_concept
9957 // implies ds_constexpr!
9958 bool concept_p
= decl_spec_seq_has_spec_p (declspecs
, ds_concept
);
9962 if (decl_spec_seq_has_spec_p (declspecs
, ds_const
))
9963 type_quals
|= TYPE_QUAL_CONST
;
9964 if (decl_spec_seq_has_spec_p (declspecs
, ds_volatile
))
9965 type_quals
|= TYPE_QUAL_VOLATILE
;
9966 if (decl_spec_seq_has_spec_p (declspecs
, ds_restrict
))
9967 type_quals
|= TYPE_QUAL_RESTRICT
;
9969 if (decl_context
== FUNCDEF
)
9970 funcdef_flag
= true, decl_context
= NORMAL
;
9971 else if (decl_context
== MEMFUNCDEF
)
9972 funcdef_flag
= true, decl_context
= FIELD
;
9973 else if (decl_context
== BITFIELD
)
9974 bitfield
= 1, decl_context
= FIELD
;
9975 else if (decl_context
== TEMPLATE_TYPE_ARG
)
9976 template_type_arg
= true, decl_context
= TYPENAME
;
9977 else if (decl_context
== TPARM
)
9978 template_parm_flag
= true, decl_context
= PARM
;
9980 if (initialized
> 1)
9981 funcdef_flag
= true;
9983 location_t typespec_loc
= smallest_type_quals_location (type_quals
,
9984 declspecs
->locations
);
9985 if (typespec_loc
== UNKNOWN_LOCATION
)
9986 typespec_loc
= declspecs
->locations
[ds_type_spec
];
9988 /* Look inside a declarator for the name being declared
9989 and get it as a string, for an error message. */
9990 for (id_declarator
= declarator
;
9992 id_declarator
= id_declarator
->declarator
)
9994 if (id_declarator
->kind
!= cdk_id
)
9995 innermost_code
= id_declarator
->kind
;
9997 switch (id_declarator
->kind
)
10000 if (id_declarator
->declarator
10001 && id_declarator
->declarator
->kind
== cdk_id
)
10003 sfk
= id_declarator
->declarator
->u
.id
.sfk
;
10004 if (sfk
== sfk_destructor
)
10011 tree qualifying_scope
= id_declarator
->u
.id
.qualifying_scope
;
10012 tree decl
= id_declarator
->u
.id
.unqualified_name
;
10015 if (qualifying_scope
)
10017 if (at_function_scope_p ())
10021 A declarator-id shall not be qualified except
10024 None of the cases are permitted in block
10026 if (qualifying_scope
== global_namespace
)
10027 error ("invalid use of qualified-name %<::%D%>",
10029 else if (TYPE_P (qualifying_scope
))
10030 error ("invalid use of qualified-name %<%T::%D%>",
10031 qualifying_scope
, decl
);
10033 error ("invalid use of qualified-name %<%D::%D%>",
10034 qualifying_scope
, decl
);
10035 return error_mark_node
;
10037 else if (TYPE_P (qualifying_scope
))
10039 ctype
= qualifying_scope
;
10040 if (!MAYBE_CLASS_TYPE_P (ctype
))
10042 error ("%q#T is not a class or a namespace", ctype
);
10045 else if (innermost_code
!= cdk_function
10046 && current_class_type
10047 && !uniquely_derived_from_p (ctype
,
10048 current_class_type
))
10050 error ("invalid use of qualified-name %<%T::%D%>",
10051 qualifying_scope
, decl
);
10052 return error_mark_node
;
10055 else if (TREE_CODE (qualifying_scope
) == NAMESPACE_DECL
)
10056 in_namespace
= qualifying_scope
;
10058 switch (TREE_CODE (decl
))
10064 if (innermost_code
!= cdk_function
)
10066 error ("declaration of %qD as non-function", decl
);
10067 return error_mark_node
;
10069 else if (!qualifying_scope
10070 && !(current_class_type
&& at_class_scope_p ()))
10072 error ("declaration of %qD as non-member", decl
);
10073 return error_mark_node
;
10076 type
= TREE_OPERAND (decl
, 0);
10078 type
= constructor_name (type
);
10079 name
= identifier_to_locale (IDENTIFIER_POINTER (type
));
10084 case TEMPLATE_ID_EXPR
:
10086 tree fns
= TREE_OPERAND (decl
, 0);
10089 if (!identifier_p (dname
))
10091 if (variable_template_p (dname
))
10092 dname
= DECL_NAME (dname
);
10095 gcc_assert (is_overloaded_fn (dname
));
10096 dname
= DECL_NAME (get_first_fn (dname
));
10100 /* Fall through. */
10102 case IDENTIFIER_NODE
:
10103 if (identifier_p (decl
))
10106 if (C_IS_RESERVED_WORD (dname
))
10108 error ("declarator-id missing; using reserved word %qD",
10110 name
= identifier_to_locale (IDENTIFIER_POINTER (dname
));
10112 else if (!IDENTIFIER_TYPENAME_P (dname
))
10113 name
= identifier_to_locale (IDENTIFIER_POINTER (dname
));
10116 gcc_assert (flags
== NO_SPECIAL
);
10117 flags
= TYPENAME_FLAG
;
10118 sfk
= sfk_conversion
;
10119 if (is_typename_at_global_scope (dname
))
10120 name
= identifier_to_locale (IDENTIFIER_POINTER (dname
));
10122 name
= "<invalid operator>";
10127 gcc_unreachable ();
10134 case cdk_reference
:
10139 name
= "decomposition";
10143 return error_mark_node
;
10146 gcc_unreachable ();
10148 if (id_declarator
->kind
== cdk_id
)
10154 The declarator in a function-definition shall have the form
10155 D1 ( parameter-declaration-clause) ... */
10156 if (funcdef_flag
&& innermost_code
!= cdk_function
)
10158 error ("function definition does not declare parameters");
10159 return error_mark_node
;
10162 if (flags
== TYPENAME_FLAG
10163 && innermost_code
!= cdk_function
10164 && ! (ctype
&& !declspecs
->any_specifiers_p
))
10166 error ("declaration of %qD as non-function", dname
);
10167 return error_mark_node
;
10171 && identifier_p (dname
)
10172 && UDLIT_OPER_P (dname
)
10173 && innermost_code
!= cdk_function
)
10175 error ("declaration of %qD as non-function", dname
);
10176 return error_mark_node
;
10179 if (dname
&& IDENTIFIER_OPNAME_P (dname
))
10183 error ("declaration of %qD as %<typedef%>", dname
);
10184 return error_mark_node
;
10186 else if (decl_context
== PARM
|| decl_context
== CATCHPARM
)
10188 error ("declaration of %qD as parameter", dname
);
10189 return error_mark_node
;
10193 /* Anything declared one level down from the top level
10194 must be one of the parameters of a function
10195 (because the body is at least two levels down). */
10197 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
10198 by not allowing C++ class definitions to specify their parameters
10199 with xdecls (must be spec.d in the parmlist).
10201 Since we now wait to push a class scope until we are sure that
10202 we are in a legitimate method context, we must set oldcname
10203 explicitly (since current_class_name is not yet alive).
10205 We also want to avoid calling this a PARM if it is in a namespace. */
10207 if (decl_context
== NORMAL
&& !toplevel_bindings_p ())
10209 cp_binding_level
*b
= current_binding_level
;
10210 current_binding_level
= b
->level_chain
;
10211 if (current_binding_level
!= 0 && toplevel_bindings_p ())
10212 decl_context
= PARM
;
10213 current_binding_level
= b
;
10217 name
= decl_context
== PARM
? "parameter" : "type name";
10219 if (concept_p
&& typedef_p
)
10221 error ("%<concept%> cannot appear in a typedef declaration");
10222 return error_mark_node
;
10225 if (constexpr_p
&& typedef_p
)
10227 error ("%<constexpr%> cannot appear in a typedef declaration");
10228 return error_mark_node
;
10231 /* If there were multiple types specified in the decl-specifier-seq,
10232 issue an error message. */
10233 if (declspecs
->multiple_types_p
)
10235 error ("two or more data types in declaration of %qs", name
);
10236 return error_mark_node
;
10239 if (declspecs
->conflicting_specifiers_p
)
10241 error ("conflicting specifiers in declaration of %qs", name
);
10242 return error_mark_node
;
10245 /* Extract the basic type from the decl-specifier-seq. */
10246 type
= declspecs
->type
;
10247 if (type
== error_mark_node
)
10250 type_was_error_mark_node
= true;
10252 /* If the entire declaration is itself tagged as deprecated then
10253 suppress reports of deprecated items. */
10254 if (type
&& TREE_DEPRECATED (type
)
10255 && deprecated_state
!= DEPRECATED_SUPPRESS
)
10256 warn_deprecated_use (type
, NULL_TREE
);
10257 if (type
&& TREE_CODE (type
) == TYPE_DECL
)
10259 typedef_decl
= type
;
10260 type
= TREE_TYPE (typedef_decl
);
10261 if (TREE_DEPRECATED (type
)
10262 && DECL_ARTIFICIAL (typedef_decl
)
10263 && deprecated_state
!= DEPRECATED_SUPPRESS
)
10264 warn_deprecated_use (type
, NULL_TREE
);
10266 /* No type at all: default to `int', and set DEFAULTED_INT
10267 because it was not a user-defined typedef. */
10268 if (type
== NULL_TREE
)
10270 if (signed_p
|| unsigned_p
|| long_p
|| short_p
)
10272 /* These imply 'int'. */
10273 type
= integer_type_node
;
10276 /* If we just have "complex", it is equivalent to "complex double". */
10277 else if (!longlong
&& !explicit_intN
10278 && decl_spec_seq_has_spec_p (declspecs
, ds_complex
))
10280 type
= double_type_node
;
10281 pedwarn (declspecs
->locations
[ds_complex
], OPT_Wpedantic
,
10282 "ISO C++ does not support plain %<complex%> meaning "
10283 "%<double complex%>");
10286 /* Gather flags. */
10287 explicit_int
= declspecs
->explicit_int_p
;
10288 explicit_char
= declspecs
->explicit_char_p
;
10291 /* See the code below that used this. */
10293 decl_attr
= DECL_ATTRIBUTES (typedef_decl
);
10295 typedef_type
= type
;
10297 if (sfk
== sfk_conversion
|| sfk
== sfk_deduction_guide
)
10298 ctor_return_type
= TREE_TYPE (dname
);
10300 ctor_return_type
= ctype
;
10302 if (sfk
!= sfk_none
)
10304 type
= check_special_function_return_type (sfk
, type
,
10307 declspecs
->locations
);
10308 type_quals
= TYPE_UNQUALIFIED
;
10310 else if (type
== NULL_TREE
)
10316 /* We handle `main' specially here, because 'main () { }' is so
10317 common. With no options, it is allowed. With -Wreturn-type,
10318 it is a warning. It is only an error with -pedantic-errors. */
10319 is_main
= (funcdef_flag
10320 && dname
&& identifier_p (dname
)
10321 && MAIN_NAME_P (dname
)
10322 && ctype
== NULL_TREE
10323 && in_namespace
== NULL_TREE
10324 && current_namespace
== global_namespace
);
10326 if (type_was_error_mark_node
)
10327 /* We've already issued an error, don't complain more. */;
10328 else if (in_system_header_at (input_location
) || flag_ms_extensions
)
10329 /* Allow it, sigh. */;
10330 else if (! is_main
)
10331 permerror (input_location
, "ISO C++ forbids declaration of %qs with no type", name
);
10333 pedwarn (input_location
, OPT_Wpedantic
,
10334 "ISO C++ forbids declaration of %qs with no type", name
);
10336 warning (OPT_Wreturn_type
,
10337 "ISO C++ forbids declaration of %qs with no type", name
);
10339 if (type_was_error_mark_node
&& template_parm_flag
)
10340 /* FIXME we should be able to propagate the error_mark_node as is
10341 for other contexts too. */
10342 type
= error_mark_node
;
10344 type
= integer_type_node
;
10351 if (! int_n_enabled_p
[declspecs
->int_n_idx
])
10353 error ("%<__int%d%> is not supported by this target",
10354 int_n_data
[declspecs
->int_n_idx
].bitsize
);
10355 explicit_intN
= false;
10357 else if (pedantic
&& ! in_system_header_at (input_location
))
10358 pedwarn (input_location
, OPT_Wpedantic
,
10359 "ISO C++ does not support %<__int%d%> for %qs",
10360 int_n_data
[declspecs
->int_n_idx
].bitsize
, name
);
10363 /* Now process the modifiers that were specified
10364 and check for invalid combinations. */
10366 /* Long double is a special combination. */
10367 if (long_p
&& !longlong
&& TYPE_MAIN_VARIANT (type
) == double_type_node
)
10370 type
= cp_build_qualified_type (long_double_type_node
,
10371 cp_type_quals (type
));
10374 /* Check all other uses of type modifiers. */
10376 if (unsigned_p
|| signed_p
|| long_p
|| short_p
)
10380 if ((signed_p
|| unsigned_p
) && TREE_CODE (type
) != INTEGER_TYPE
)
10381 error ("%<signed%> or %<unsigned%> invalid for %qs", name
);
10382 else if (signed_p
&& unsigned_p
)
10383 error ("%<signed%> and %<unsigned%> specified together for %qs", name
);
10384 else if (longlong
&& TREE_CODE (type
) != INTEGER_TYPE
)
10385 error ("%<long long%> invalid for %qs", name
);
10386 else if (long_p
&& TREE_CODE (type
) == REAL_TYPE
)
10387 error ("%<long%> invalid for %qs", name
);
10388 else if (short_p
&& TREE_CODE (type
) == REAL_TYPE
)
10389 error ("%<short%> invalid for %qs", name
);
10390 else if ((long_p
|| short_p
) && TREE_CODE (type
) != INTEGER_TYPE
)
10391 error ("%<long%> or %<short%> invalid for %qs", name
);
10392 else if ((long_p
|| short_p
|| explicit_char
|| explicit_int
) && explicit_intN
)
10393 error ("%<long%>, %<int%>, %<short%>, or %<char%> invalid for %qs", name
);
10394 else if ((long_p
|| short_p
) && explicit_char
)
10395 error ("%<long%> or %<short%> specified with char for %qs", name
);
10396 else if (long_p
&& short_p
)
10397 error ("%<long%> and %<short%> specified together for %qs", name
);
10398 else if (type
== char16_type_node
|| type
== char32_type_node
)
10400 if (signed_p
|| unsigned_p
)
10401 error ("%<signed%> or %<unsigned%> invalid for %qs", name
);
10402 else if (short_p
|| long_p
)
10403 error ("%<short%> or %<long%> invalid for %qs", name
);
10408 if (!explicit_int
&& !defaulted_int
&& !explicit_char
&& !explicit_intN
&& pedantic
)
10410 pedwarn (input_location
, OPT_Wpedantic
,
10411 "long, short, signed or unsigned used invalidly for %qs",
10413 if (flag_pedantic_errors
)
10418 /* Discard the type modifiers if they are invalid. */
10421 unsigned_p
= false;
10429 /* Decide whether an integer type is signed or not.
10430 Optionally treat bitfields as signed by default. */
10434 It is implementation-defined whether a plain (neither
10435 explicitly signed or unsigned) char, short, int, or long
10436 bit-field is signed or unsigned.
10438 Naturally, we extend this to long long as well. Note that
10439 this does not include wchar_t. */
10440 || (bitfield
&& !flag_signed_bitfields
10442 /* A typedef for plain `int' without `signed' can be
10443 controlled just like plain `int', but a typedef for
10444 `signed int' cannot be so controlled. */
10446 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl
))
10447 && TREE_CODE (type
) == INTEGER_TYPE
10448 && !same_type_p (TYPE_MAIN_VARIANT (type
), wchar_type_node
)))
10451 type
= int_n_trees
[declspecs
->int_n_idx
].unsigned_type
;
10453 type
= long_long_unsigned_type_node
;
10455 type
= long_unsigned_type_node
;
10457 type
= short_unsigned_type_node
;
10458 else if (type
== char_type_node
)
10459 type
= unsigned_char_type_node
;
10460 else if (typedef_decl
)
10461 type
= unsigned_type_for (type
);
10463 type
= unsigned_type_node
;
10465 else if (signed_p
&& type
== char_type_node
)
10466 type
= signed_char_type_node
;
10467 else if (explicit_intN
)
10468 type
= int_n_trees
[declspecs
->int_n_idx
].signed_type
;
10470 type
= long_long_integer_type_node
;
10472 type
= long_integer_type_node
;
10474 type
= short_integer_type_node
;
10476 if (decl_spec_seq_has_spec_p (declspecs
, ds_complex
))
10478 if (TREE_CODE (type
) != INTEGER_TYPE
&& TREE_CODE (type
) != REAL_TYPE
)
10479 error ("complex invalid for %qs", name
);
10480 /* If a modifier is specified, the resulting complex is the complex
10481 form of TYPE. E.g, "complex short" is "complex short int". */
10482 else if (type
== integer_type_node
)
10483 type
= complex_integer_type_node
;
10484 else if (type
== float_type_node
)
10485 type
= complex_float_type_node
;
10486 else if (type
== double_type_node
)
10487 type
= complex_double_type_node
;
10488 else if (type
== long_double_type_node
)
10489 type
= complex_long_double_type_node
;
10491 type
= build_complex_type (type
);
10494 /* If we're using the injected-class-name to form a compound type or a
10495 declaration, replace it with the underlying class so we don't get
10496 redundant typedefs in the debug output. But if we are returning the
10497 type unchanged, leave it alone so that it's available to
10498 maybe_get_template_decl_from_type_decl. */
10499 if (CLASS_TYPE_P (type
)
10500 && DECL_SELF_REFERENCE_P (TYPE_NAME (type
))
10501 && type
== TREE_TYPE (TYPE_NAME (type
))
10502 && (declarator
|| type_quals
))
10503 type
= DECL_ORIGINAL_TYPE (TYPE_NAME (type
));
10505 type_quals
|= cp_type_quals (type
);
10506 type
= cp_build_qualified_type_real
10507 (type
, type_quals
, ((((typedef_decl
&& !DECL_ARTIFICIAL (typedef_decl
))
10508 || declspecs
->decltype_p
)
10509 ? tf_ignore_bad_quals
: 0) | tf_warning_or_error
));
10510 /* We might have ignored or rejected some of the qualifiers. */
10511 type_quals
= cp_type_quals (type
);
10513 if (cxx_dialect
>= cxx1z
&& type
&& is_auto (type
)
10514 && innermost_code
!= cdk_function
10515 && id_declarator
&& declarator
!= id_declarator
)
10516 if (tree tmpl
= CLASS_PLACEHOLDER_TEMPLATE (type
))
10518 error_at (typespec_loc
, "template placeholder type %qT must be followed "
10519 "by a simple declarator-id", type
);
10520 inform (DECL_SOURCE_LOCATION (tmpl
), "%qD declared here", tmpl
);
10524 inlinep
= decl_spec_seq_has_spec_p (declspecs
, ds_inline
);
10525 virtualp
= decl_spec_seq_has_spec_p (declspecs
, ds_virtual
);
10526 explicitp
= decl_spec_seq_has_spec_p (declspecs
, ds_explicit
);
10528 storage_class
= declspecs
->storage_class
;
10529 if (storage_class
== sc_static
)
10530 staticp
= 1 + (decl_context
== FIELD
);
10536 error ("member %qD cannot be declared both %<virtual%> "
10537 "and %<static%>", dname
);
10538 storage_class
= sc_none
;
10542 error ("member %qD cannot be declared both %<virtual%> "
10543 "and %<constexpr%>", dname
);
10545 friendp
= decl_spec_seq_has_spec_p (declspecs
, ds_friend
);
10547 /* Issue errors about use of storage classes for parameters. */
10548 if (decl_context
== PARM
)
10552 error ("typedef declaration invalid in parameter declaration");
10553 return error_mark_node
;
10555 else if (template_parm_flag
&& storage_class
!= sc_none
)
10557 error ("storage class specified for template parameter %qs", name
);
10558 return error_mark_node
;
10560 else if (storage_class
== sc_static
10561 || storage_class
== sc_extern
10563 error ("storage class specifiers invalid in parameter declarations");
10565 /* Function parameters cannot be concept. */
10567 error ("a parameter cannot be declared %<concept%>");
10568 /* Function parameters cannot be constexpr. If we saw one, moan
10569 and pretend it wasn't there. */
10570 else if (constexpr_p
)
10572 error ("a parameter cannot be declared %<constexpr%>");
10577 /* Give error if `virtual' is used outside of class declaration. */
10579 && (current_class_name
== NULL_TREE
|| decl_context
!= FIELD
))
10581 error_at (declspecs
->locations
[ds_virtual
],
10582 "%<virtual%> outside class declaration");
10586 if (innermost_code
== cdk_decomp
)
10588 location_t loc
= (declarator
->kind
== cdk_reference
10589 ? declarator
->declarator
->id_loc
: declarator
->id_loc
);
10591 error_at (declspecs
->locations
[ds_inline
],
10592 "decomposition declaration cannot be declared %<inline%>");
10594 error_at (declspecs
->locations
[ds_typedef
],
10595 "decomposition declaration cannot be declared %<typedef%>");
10597 error_at (declspecs
->locations
[ds_constexpr
], "decomposition "
10598 "declaration cannot be declared %<constexpr%>");
10600 error_at (declspecs
->locations
[ds_thread
],
10601 "decomposition declaration cannot be declared %qs",
10602 declspecs
->gnu_thread_keyword_p
10603 ? "__thread" : "thread_local");
10605 error_at (declspecs
->locations
[ds_concept
],
10606 "decomposition declaration cannot be declared %<concept%>");
10607 switch (storage_class
)
10612 error_at (loc
, "decomposition declaration cannot be declared "
10616 error_at (loc
, "decomposition declaration cannot be declared "
10620 error_at (loc
, "decomposition declaration cannot be declared "
10624 error_at (loc
, "decomposition declaration cannot be declared "
10628 error_at (loc
, "decomposition declaration cannot be declared "
10632 gcc_unreachable ();
10634 if (TREE_CODE (type
) != TEMPLATE_TYPE_PARM
10635 || TYPE_IDENTIFIER (type
) != auto_identifier
)
10637 if (type
!= error_mark_node
)
10639 error_at (loc
, "decomposition declaration cannot be declared "
10640 "with type %qT", type
);
10642 "type must be cv-qualified %<auto%> or reference to "
10643 "cv-qualified %<auto%>");
10645 type
= build_qualified_type (make_auto (), type_quals
);
10646 declspecs
->type
= type
;
10653 storage_class
= sc_none
;
10655 declspecs
->storage_class
= sc_none
;
10656 declspecs
->locations
[ds_thread
] = UNKNOWN_LOCATION
;
10659 /* Static anonymous unions are dealt with here. */
10660 if (staticp
&& decl_context
== TYPENAME
10662 && ANON_AGGR_TYPE_P (declspecs
->type
))
10663 decl_context
= FIELD
;
10665 /* Warn about storage classes that are invalid for certain
10666 kinds of declarations (parameters, typenames, etc.). */
10669 && storage_class
!= sc_extern
10670 && storage_class
!= sc_static
)
10673 error ("multiple storage classes in declaration of %qs", name
);
10676 if (decl_context
!= NORMAL
10677 && ((storage_class
!= sc_none
10678 && storage_class
!= sc_mutable
)
10681 if ((decl_context
== PARM
|| decl_context
== CATCHPARM
)
10682 && (storage_class
== sc_register
10683 || storage_class
== sc_auto
))
10685 else if (typedef_p
)
10687 else if (decl_context
== FIELD
10688 /* C++ allows static class elements. */
10689 && storage_class
== sc_static
)
10690 /* C++ also allows inlines and signed and unsigned elements,
10691 but in those cases we don't come in here. */
10695 if (decl_context
== FIELD
)
10696 error ("storage class specified for %qs", name
);
10699 if (decl_context
== PARM
|| decl_context
== CATCHPARM
)
10700 error ("storage class specified for parameter %qs", name
);
10702 error ("storage class specified for typename");
10704 if (storage_class
== sc_register
10705 || storage_class
== sc_auto
10706 || storage_class
== sc_extern
10708 storage_class
= sc_none
;
10711 else if (storage_class
== sc_extern
&& funcdef_flag
10712 && ! toplevel_bindings_p ())
10713 error ("nested function %qs declared %<extern%>", name
);
10714 else if (toplevel_bindings_p ())
10716 if (storage_class
== sc_auto
)
10717 error ("top-level declaration of %qs specifies %<auto%>", name
);
10720 && storage_class
!= sc_extern
10721 && storage_class
!= sc_static
)
10723 if (declspecs
->gnu_thread_keyword_p
)
10724 pedwarn (input_location
, 0, "function-scope %qs implicitly auto and "
10725 "declared %<__thread%>", name
);
10727 /* When thread_local is applied to a variable of block scope the
10728 storage-class-specifier static is implied if it does not appear
10730 storage_class
= declspecs
->storage_class
= sc_static
;
10734 if (storage_class
&& friendp
)
10736 error ("storage class specifiers invalid in friend function declarations");
10737 storage_class
= sc_none
;
10741 if (!id_declarator
)
10742 unqualified_id
= NULL_TREE
;
10745 unqualified_id
= id_declarator
->u
.id
.unqualified_name
;
10746 switch (TREE_CODE (unqualified_id
))
10749 unqualified_id
= TREE_OPERAND (unqualified_id
, 0);
10750 if (TYPE_P (unqualified_id
))
10751 unqualified_id
= constructor_name (unqualified_id
);
10754 case IDENTIFIER_NODE
:
10755 case TEMPLATE_ID_EXPR
:
10759 gcc_unreachable ();
10763 if (declspecs
->std_attributes
)
10765 /* Apply the c++11 attributes to the type preceding them. */
10766 input_location
= declspecs
->locations
[ds_std_attribute
];
10767 decl_attributes (&type
, declspecs
->std_attributes
, 0);
10768 input_location
= saved_loc
;
10771 /* Determine the type of the entity declared by recurring on the
10773 for (; declarator
; declarator
= declarator
->declarator
)
10775 const cp_declarator
*inner_declarator
;
10778 if (type
== error_mark_node
)
10779 return error_mark_node
;
10781 attrs
= declarator
->attributes
;
10787 if (declarator
== NULL
|| declarator
->kind
== cdk_id
)
10788 attr_flags
|= (int) ATTR_FLAG_DECL_NEXT
;
10789 if (declarator
->kind
== cdk_function
)
10790 attr_flags
|= (int) ATTR_FLAG_FUNCTION_NEXT
;
10791 if (declarator
->kind
== cdk_array
)
10792 attr_flags
|= (int) ATTR_FLAG_ARRAY_NEXT
;
10793 returned_attrs
= decl_attributes (&type
,
10794 chainon (returned_attrs
, attrs
),
10798 if (declarator
->kind
== cdk_id
|| declarator
->kind
== cdk_decomp
)
10801 inner_declarator
= declarator
->declarator
;
10803 switch (declarator
->kind
)
10806 type
= create_array_type_for_decl (dname
, type
,
10807 declarator
->u
.array
.bounds
);
10808 if (!valid_array_size_p (input_location
, type
, dname
))
10809 type
= error_mark_node
;
10811 if (declarator
->std_attributes
)
10814 The optional attribute-specifier-seq appertains to the
10816 returned_attrs
= chainon (returned_attrs
,
10817 declarator
->std_attributes
);
10825 /* Declaring a function type.
10826 Make sure we have a valid type for the function to return. */
10828 if (type_quals
!= TYPE_UNQUALIFIED
)
10830 if (SCALAR_TYPE_P (type
) || VOID_TYPE_P (type
))
10832 warning_at (typespec_loc
, OPT_Wignored_qualifiers
, "type "
10833 "qualifiers ignored on function return type");
10835 /* We now know that the TYPE_QUALS don't apply to the
10836 decl, but to its return type. */
10837 type_quals
= TYPE_UNQUALIFIED
;
10840 /* Error about some types functions can't return. */
10842 if (TREE_CODE (type
) == FUNCTION_TYPE
)
10844 error ("%qs declared as function returning a function", name
);
10845 return error_mark_node
;
10847 if (TREE_CODE (type
) == ARRAY_TYPE
)
10849 error ("%qs declared as function returning an array", name
);
10850 return error_mark_node
;
10853 input_location
= declspecs
->locations
[ds_type_spec
];
10854 abstract_virtuals_error (ACU_RETURN
, type
);
10855 input_location
= saved_loc
;
10857 /* Pick up type qualifiers which should be applied to `this'. */
10858 memfn_quals
= declarator
->u
.function
.qualifiers
;
10859 /* Pick up virt-specifiers. */
10860 virt_specifiers
= declarator
->u
.function
.virt_specifiers
;
10861 /* And ref-qualifier, too */
10862 rqual
= declarator
->u
.function
.ref_qualifier
;
10863 /* And tx-qualifier. */
10864 tree tx_qual
= declarator
->u
.function
.tx_qualifier
;
10865 /* Pick up the exception specifications. */
10866 raises
= declarator
->u
.function
.exception_specification
;
10867 /* If the exception-specification is ill-formed, let's pretend
10868 there wasn't one. */
10869 if (raises
== error_mark_node
)
10870 raises
= NULL_TREE
;
10873 error_at (location_of (reqs
), "requires-clause on return type");
10874 reqs
= declarator
->u
.function
.requires_clause
;
10876 /* Say it's a definition only for the CALL_EXPR
10877 closest to the identifier. */
10878 funcdecl_p
= inner_declarator
&& inner_declarator
->kind
== cdk_id
;
10880 /* Handle a late-specified return type. */
10881 tree late_return_type
= declarator
->u
.function
.late_return_type
;
10884 if (tree auto_node
= type_uses_auto (type
))
10886 if (!late_return_type
)
10888 if (current_class_type
10889 && LAMBDA_TYPE_P (current_class_type
))
10890 /* OK for C++11 lambdas. */;
10891 else if (cxx_dialect
< cxx14
)
10893 error ("%qs function uses "
10894 "%<auto%> type specifier without trailing "
10895 "return type", name
);
10896 inform (input_location
, "deduced return type "
10897 "only available with -std=c++14 or "
10902 error ("virtual function cannot "
10903 "have deduced return type");
10907 else if (!is_auto (type
) && sfk
!= sfk_conversion
)
10909 error ("%qs function with trailing return type has"
10910 " %qT as its type rather than plain %<auto%>",
10912 return error_mark_node
;
10914 if (tree tmpl
= CLASS_PLACEHOLDER_TEMPLATE (auto_node
))
10916 if (!late_return_type
)
10918 if (dguide_name_p (unqualified_id
))
10919 error_at (declarator
->id_loc
, "deduction guide "
10920 "for %qT must have trailing return "
10921 "type", TREE_TYPE (tmpl
));
10923 error_at (declarator
->id_loc
, "deduced class "
10924 "type %qT in function return type",
10926 inform (DECL_SOURCE_LOCATION (tmpl
),
10927 "%qD declared here", tmpl
);
10929 else if (CLASS_TYPE_P (late_return_type
)
10930 && CLASSTYPE_TEMPLATE_INFO (late_return_type
)
10931 && (CLASSTYPE_TI_TEMPLATE (late_return_type
)
10935 error ("trailing return type %qT of deduction guide "
10936 "is not a specialization of %qT",
10937 late_return_type
, TREE_TYPE (tmpl
));
10940 else if (late_return_type
10941 && sfk
!= sfk_conversion
)
10943 if (cxx_dialect
< cxx11
)
10944 /* Not using maybe_warn_cpp0x because this should
10945 always be an error. */
10946 error ("trailing return type only available with "
10947 "-std=c++11 or -std=gnu++11");
10949 error ("%qs function with trailing return type not "
10950 "declared with %<auto%> type specifier", name
);
10951 return error_mark_node
;
10954 type
= splice_late_return_type (type
, late_return_type
);
10955 if (type
== error_mark_node
)
10956 return error_mark_node
;
10958 if (late_return_type
)
10959 late_return_type_p
= true;
10961 if (ctype
== NULL_TREE
10962 && decl_context
== FIELD
10965 ctype
= current_class_type
;
10967 if (ctype
&& (sfk
== sfk_constructor
10968 || sfk
== sfk_destructor
))
10970 /* We are within a class's scope. If our declarator name
10971 is the same as the class name, and we are defining
10972 a function, then it is a constructor/destructor, and
10973 therefore returns a void type. */
10975 /* ISO C++ 12.4/2. A destructor may not be declared
10976 const or volatile. A destructor may not be static.
10977 A destructor may not be declared with ref-qualifier.
10979 ISO C++ 12.1. A constructor may not be declared
10980 const or volatile. A constructor may not be
10981 virtual. A constructor may not be static.
10982 A constructor may not be declared with ref-qualifier. */
10984 error ((flags
== DTOR_FLAG
)
10985 ? G_("destructor cannot be static member function")
10986 : G_("constructor cannot be static member function"));
10989 error ((flags
== DTOR_FLAG
)
10990 ? G_("destructors may not be cv-qualified")
10991 : G_("constructors may not be cv-qualified"));
10992 memfn_quals
= TYPE_UNQUALIFIED
;
10997 maybe_warn_cpp0x (CPP0X_REF_QUALIFIER
);
10998 error ((flags
== DTOR_FLAG
)
10999 ? "destructors may not be ref-qualified"
11000 : "constructors may not be ref-qualified");
11001 rqual
= REF_QUAL_NONE
;
11004 if (decl_context
== FIELD
11005 && !member_function_or_else (ctype
,
11006 current_class_type
,
11008 return error_mark_node
;
11010 if (flags
!= DTOR_FLAG
)
11012 /* It's a constructor. */
11013 if (explicitp
== 1)
11017 permerror (input_location
,
11018 "constructors cannot be declared %<virtual%>");
11021 if (decl_context
== FIELD
11022 && sfk
!= sfk_constructor
)
11023 return error_mark_node
;
11025 if (decl_context
== FIELD
)
11032 /* Cannot be both friend and virtual. */
11033 error ("virtual functions cannot be friends");
11036 if (decl_context
== NORMAL
)
11037 error ("friend declaration not in class definition");
11038 if (current_function_decl
&& funcdef_flag
)
11039 error ("can%'t define friend function %qs in a local "
11040 "class definition",
11043 else if (ctype
&& sfk
== sfk_conversion
)
11045 if (explicitp
== 1)
11047 maybe_warn_cpp0x (CPP0X_EXPLICIT_CONVERSION
);
11050 if (late_return_type_p
)
11051 error ("a conversion function cannot have a trailing return type");
11053 else if (sfk
== sfk_deduction_guide
)
11055 if (explicitp
== 1)
11059 arg_types
= grokparms (declarator
->u
.function
.parameters
,
11062 if (inner_declarator
11063 && inner_declarator
->kind
== cdk_id
11064 && inner_declarator
->u
.id
.sfk
== sfk_destructor
11065 && arg_types
!= void_list_node
)
11067 error ("destructors may not have parameters");
11068 arg_types
= void_list_node
;
11072 type
= build_function_type (type
, arg_types
);
11074 tree attrs
= declarator
->std_attributes
;
11077 tree att
= build_tree_list (tx_qual
, NULL_TREE
);
11078 /* transaction_safe applies to the type, but
11079 transaction_safe_dynamic applies to the function. */
11080 if (is_attribute_p ("transaction_safe", tx_qual
))
11081 attrs
= chainon (attrs
, att
);
11083 returned_attrs
= chainon (returned_attrs
, att
);
11088 The optional attribute-specifier-seq appertains to
11089 the function type. */
11090 decl_attributes (&type
, attrs
, 0);
11093 type
= build_exception_variant (type
, raises
);
11098 case cdk_reference
:
11100 /* Filter out pointers-to-references and references-to-references.
11101 We can get these if a TYPE_DECL is used. */
11103 if (TREE_CODE (type
) == REFERENCE_TYPE
)
11105 if (declarator
->kind
!= cdk_reference
)
11107 error ("cannot declare pointer to %q#T", type
);
11108 type
= TREE_TYPE (type
);
11111 /* In C++0x, we allow reference to reference declarations
11112 that occur indirectly through typedefs [7.1.3/8 dcl.typedef]
11113 and template type arguments [14.3.1/4 temp.arg.type]. The
11114 check for direct reference to reference declarations, which
11115 are still forbidden, occurs below. Reasoning behind the change
11116 can be found in DR106, DR540, and the rvalue reference
11118 else if (cxx_dialect
== cxx98
)
11120 error ("cannot declare reference to %q#T", type
);
11121 type
= TREE_TYPE (type
);
11124 else if (VOID_TYPE_P (type
))
11126 if (declarator
->kind
== cdk_reference
)
11127 error ("cannot declare reference to %q#T", type
);
11128 else if (declarator
->kind
== cdk_ptrmem
)
11129 error ("cannot declare pointer to %q#T member", type
);
11132 /* We now know that the TYPE_QUALS don't apply to the decl,
11133 but to the target of the pointer. */
11134 type_quals
= TYPE_UNQUALIFIED
;
11136 /* This code used to handle METHOD_TYPE, but I don't think it's
11137 possible to get it here anymore. */
11138 gcc_assert (TREE_CODE (type
) != METHOD_TYPE
);
11139 if (declarator
->kind
== cdk_ptrmem
11140 && TREE_CODE (type
) == FUNCTION_TYPE
)
11142 memfn_quals
|= type_memfn_quals (type
);
11143 type
= build_memfn_type (type
,
11144 declarator
->u
.pointer
.class_type
,
11147 if (type
== error_mark_node
)
11148 return error_mark_node
;
11150 rqual
= REF_QUAL_NONE
;
11151 memfn_quals
= TYPE_UNQUALIFIED
;
11154 if (TREE_CODE (type
) == FUNCTION_TYPE
11155 && (type_memfn_quals (type
) != TYPE_UNQUALIFIED
11156 || type_memfn_rqual (type
) != REF_QUAL_NONE
))
11157 error (declarator
->kind
== cdk_reference
11158 ? G_("cannot declare reference to qualified function type %qT")
11159 : G_("cannot declare pointer to qualified function type %qT"),
11162 /* When the pointed-to type involves components of variable size,
11163 care must be taken to ensure that the size evaluation code is
11164 emitted early enough to dominate all the possible later uses
11165 and late enough for the variables on which it depends to have
11168 This is expected to happen automatically when the pointed-to
11169 type has a name/declaration of it's own, but special attention
11170 is required if the type is anonymous.
11172 We handle the NORMAL and FIELD contexts here by inserting a
11173 dummy statement that just evaluates the size at a safe point
11174 and ensures it is not deferred until e.g. within a deeper
11175 conditional context (c++/43555).
11177 We expect nothing to be needed here for PARM or TYPENAME.
11178 Evaluating the size at this point for TYPENAME would
11179 actually be incorrect, as we might be in the middle of an
11180 expression with side effects on the pointed-to type size
11181 "arguments" prior to the pointer declaration point and the
11182 size evaluation could end up prior to the side effects. */
11184 if (!TYPE_NAME (type
)
11185 && (decl_context
== NORMAL
|| decl_context
== FIELD
)
11186 && at_function_scope_p ()
11187 && variably_modified_type_p (type
, NULL_TREE
))
11189 TYPE_NAME (type
) = build_decl (UNKNOWN_LOCATION
, TYPE_DECL
,
11191 add_decl_expr (TYPE_NAME (type
));
11194 if (declarator
->kind
== cdk_reference
)
11196 /* In C++0x, the type we are creating a reference to might be
11197 a typedef which is itself a reference type. In that case,
11198 we follow the reference collapsing rules in
11199 [7.1.3/8 dcl.typedef] to create the final reference type:
11201 "If a typedef TD names a type that is a reference to a type
11202 T, an attempt to create the type 'lvalue reference to cv TD'
11203 creates the type 'lvalue reference to T,' while an attempt
11204 to create the type "rvalue reference to cv TD' creates the
11207 if (VOID_TYPE_P (type
))
11208 /* We already gave an error. */;
11209 else if (TREE_CODE (type
) == REFERENCE_TYPE
)
11211 if (declarator
->u
.reference
.rvalue_ref
)
11212 /* Leave type alone. */;
11214 type
= cp_build_reference_type (TREE_TYPE (type
), false);
11217 type
= cp_build_reference_type
11218 (type
, declarator
->u
.reference
.rvalue_ref
);
11220 /* In C++0x, we need this check for direct reference to
11221 reference declarations, which are forbidden by
11222 [8.3.2/5 dcl.ref]. Reference to reference declarations
11223 are only allowed indirectly through typedefs and template
11224 type arguments. Example:
11226 void foo(int & &); // invalid ref-to-ref decl
11228 typedef int & int_ref;
11229 void foo(int_ref &); // valid ref-to-ref decl
11231 if (inner_declarator
&& inner_declarator
->kind
== cdk_reference
)
11232 error ("cannot declare reference to %q#T, which is not "
11233 "a typedef or a template type argument", type
);
11235 else if (TREE_CODE (type
) == METHOD_TYPE
)
11236 type
= build_ptrmemfunc_type (build_pointer_type (type
));
11237 else if (declarator
->kind
== cdk_ptrmem
)
11239 gcc_assert (TREE_CODE (declarator
->u
.pointer
.class_type
)
11240 != NAMESPACE_DECL
);
11241 if (declarator
->u
.pointer
.class_type
== error_mark_node
)
11242 /* We will already have complained. */
11243 type
= error_mark_node
;
11245 type
= build_ptrmem_type (declarator
->u
.pointer
.class_type
,
11249 type
= build_pointer_type (type
);
11251 /* Process a list of type modifier keywords (such as
11252 const or volatile) that were given inside the `*' or `&'. */
11254 if (declarator
->u
.pointer
.qualifiers
)
11257 = cp_build_qualified_type (type
,
11258 declarator
->u
.pointer
.qualifiers
);
11259 type_quals
= cp_type_quals (type
);
11262 /* Apply C++11 attributes to the pointer, and not to the
11263 type pointed to. This is unlike what is done for GNU
11264 attributes above. It is to comply with [dcl.ptr]/1:
11266 [the optional attribute-specifier-seq (7.6.1) appertains
11267 to the pointer and not to the object pointed to]. */
11268 if (declarator
->std_attributes
)
11269 decl_attributes (&type
, declarator
->std_attributes
,
11279 gcc_unreachable ();
11283 /* A `constexpr' specifier used in an object declaration declares
11284 the object as `const'. */
11285 if (constexpr_p
&& innermost_code
!= cdk_function
)
11287 /* DR1688 says that a `constexpr' specifier in combination with
11288 `volatile' is valid. */
11290 if (TREE_CODE (type
) != REFERENCE_TYPE
)
11292 type_quals
|= TYPE_QUAL_CONST
;
11293 type
= cp_build_qualified_type (type
, type_quals
);
11297 if (unqualified_id
&& TREE_CODE (unqualified_id
) == TEMPLATE_ID_EXPR
11298 && TREE_CODE (type
) != FUNCTION_TYPE
11299 && TREE_CODE (type
) != METHOD_TYPE
11300 && !variable_template_p (TREE_OPERAND (unqualified_id
, 0)))
11302 error ("template-id %qD used as a declarator",
11304 unqualified_id
= dname
;
11307 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
11308 qualified with a class-name, turn it into a METHOD_TYPE, unless
11309 we know that the function is static. We take advantage of this
11310 opportunity to do other processing that pertains to entities
11311 explicitly declared to be class members. Note that if DECLARATOR
11312 is non-NULL, we know it is a cdk_id declarator; otherwise, we
11313 would not have exited the loop above. */
11315 && declarator
->kind
== cdk_id
11316 && declarator
->u
.id
.qualifying_scope
11317 && MAYBE_CLASS_TYPE_P (declarator
->u
.id
.qualifying_scope
))
11319 ctype
= declarator
->u
.id
.qualifying_scope
;
11320 ctype
= TYPE_MAIN_VARIANT (ctype
);
11321 template_count
= num_template_headers_for_class (ctype
);
11323 if (ctype
== current_class_type
)
11327 permerror (input_location
, "member functions are implicitly "
11328 "friends of their class");
11332 permerror (declarator
->id_loc
,
11333 "extra qualification %<%T::%> on member %qs",
11336 else if (/* If the qualifying type is already complete, then we
11337 can skip the following checks. */
11338 !COMPLETE_TYPE_P (ctype
)
11339 && (/* If the function is being defined, then
11340 qualifying type must certainly be complete. */
11342 /* A friend declaration of "T::f" is OK, even if
11343 "T" is a template parameter. But, if this
11344 function is not a friend, the qualifying type
11345 must be a class. */
11346 || (!friendp
&& !CLASS_TYPE_P (ctype
))
11347 /* For a declaration, the type need not be
11348 complete, if either it is dependent (since there
11349 is no meaningful definition of complete in that
11350 case) or the qualifying class is currently being
11352 || !(dependent_type_p (ctype
)
11353 || currently_open_class (ctype
)))
11354 /* Check that the qualifying type is complete. */
11355 && !complete_type_or_else (ctype
, NULL_TREE
))
11356 return error_mark_node
;
11357 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
11359 if (current_class_type
11360 && (!friendp
|| funcdef_flag
))
11362 error (funcdef_flag
11363 ? G_("cannot define member function %<%T::%s%> "
11365 : G_("cannot declare member function %<%T::%s%> "
11367 ctype
, name
, current_class_type
);
11368 return error_mark_node
;
11371 else if (typedef_p
&& current_class_type
)
11373 error ("cannot declare member %<%T::%s%> within %qT",
11374 ctype
, name
, current_class_type
);
11375 return error_mark_node
;
11379 if (ctype
== NULL_TREE
&& decl_context
== FIELD
&& friendp
== 0)
11380 ctype
= current_class_type
;
11382 /* Now TYPE has the actual type. */
11384 if (returned_attrs
)
11387 *attrlist
= chainon (returned_attrs
, *attrlist
);
11389 attrlist
= &returned_attrs
;
11393 && declarator
->kind
== cdk_id
11394 && declarator
->std_attributes
)
11395 /* [dcl.meaning]/1: The optional attribute-specifier-seq following
11396 a declarator-id appertains to the entity that is declared. */
11397 *attrlist
= chainon (*attrlist
, declarator
->std_attributes
);
11399 /* Handle parameter packs. */
11400 if (parameter_pack_p
)
11402 if (decl_context
== PARM
)
11403 /* Turn the type into a pack expansion.*/
11404 type
= make_pack_expansion (type
);
11406 error ("non-parameter %qs cannot be a parameter pack", name
);
11409 if ((decl_context
== FIELD
|| decl_context
== PARM
)
11410 && !processing_template_decl
11411 && variably_modified_type_p (type
, NULL_TREE
))
11413 if (decl_context
== FIELD
)
11414 error ("data member may not have variably modified type %qT", type
);
11416 error ("parameter may not have variably modified type %qT", type
);
11417 type
= error_mark_node
;
11420 if (explicitp
== 1 || (explicitp
&& friendp
))
11422 /* [dcl.fct.spec] (C++11) The explicit specifier shall be used only
11423 in the declaration of a constructor or conversion function within
11424 a class definition. */
11425 if (!current_class_type
)
11426 error_at (declspecs
->locations
[ds_explicit
],
11427 "%<explicit%> outside class declaration");
11429 error_at (declspecs
->locations
[ds_explicit
],
11430 "%<explicit%> in friend declaration");
11432 error_at (declspecs
->locations
[ds_explicit
],
11433 "only declarations of constructors and conversion operators "
11434 "can be %<explicit%>");
11438 if (storage_class
== sc_mutable
)
11440 if (decl_context
!= FIELD
|| friendp
)
11442 error ("non-member %qs cannot be declared %<mutable%>", name
);
11443 storage_class
= sc_none
;
11445 else if (decl_context
== TYPENAME
|| typedef_p
)
11447 error ("non-object member %qs cannot be declared %<mutable%>", name
);
11448 storage_class
= sc_none
;
11450 else if (TREE_CODE (type
) == FUNCTION_TYPE
11451 || TREE_CODE (type
) == METHOD_TYPE
)
11453 error ("function %qs cannot be declared %<mutable%>", name
);
11454 storage_class
= sc_none
;
11458 error ("static %qs cannot be declared %<mutable%>", name
);
11459 storage_class
= sc_none
;
11461 else if (type_quals
& TYPE_QUAL_CONST
)
11463 error ("const %qs cannot be declared %<mutable%>", name
);
11464 storage_class
= sc_none
;
11466 else if (TREE_CODE (type
) == REFERENCE_TYPE
)
11468 permerror (input_location
, "reference %qs cannot be declared "
11469 "%<mutable%>", name
);
11470 storage_class
= sc_none
;
11474 /* If this is declaring a typedef name, return a TYPE_DECL. */
11475 if (typedef_p
&& decl_context
!= TYPENAME
)
11479 /* This declaration:
11481 typedef void f(int) const;
11483 declares a function type which is not a member of any
11484 particular class, but which is cv-qualified; for
11485 example "f S::*" declares a pointer to a const-qualified
11486 member function of S. We record the cv-qualification in the
11488 if ((rqual
|| memfn_quals
) && TREE_CODE (type
) == FUNCTION_TYPE
)
11490 type
= apply_memfn_quals (type
, memfn_quals
, rqual
);
11492 /* We have now dealt with these qualifiers. */
11493 memfn_quals
= TYPE_UNQUALIFIED
;
11494 rqual
= REF_QUAL_NONE
;
11497 if (type_uses_auto (type
))
11499 error ("typedef declared %<auto%>");
11500 type
= error_mark_node
;
11504 error_at (location_of (reqs
), "requires-clause on typedef");
11506 if (decl_context
== FIELD
)
11507 decl
= build_lang_decl (TYPE_DECL
, unqualified_id
, type
);
11509 decl
= build_decl (input_location
, TYPE_DECL
, unqualified_id
, type
);
11510 if (id_declarator
&& declarator
->u
.id
.qualifying_scope
) {
11511 error_at (DECL_SOURCE_LOCATION (decl
),
11512 "typedef name may not be a nested-name-specifier");
11513 TREE_TYPE (decl
) = error_mark_node
;
11516 if (decl_context
!= FIELD
)
11518 if (!current_function_decl
)
11519 DECL_CONTEXT (decl
) = FROB_CONTEXT (current_namespace
);
11520 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (current_function_decl
)
11521 || (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P
11522 (current_function_decl
)))
11523 /* The TYPE_DECL is "abstract" because there will be
11524 clones of this constructor/destructor, and there will
11525 be copies of this TYPE_DECL generated in those
11526 clones. The decloning optimization (for space) may
11527 revert this subsequently if it determines that
11528 the clones should share a common implementation. */
11529 DECL_ABSTRACT_P (decl
) = true;
11531 else if (current_class_type
11532 && constructor_name_p (unqualified_id
, current_class_type
))
11533 permerror (input_location
, "ISO C++ forbids nested type %qD with same name "
11534 "as enclosing class",
11537 /* If the user declares "typedef struct {...} foo" then the
11538 struct will have an anonymous name. Fill that name in now.
11539 Nothing can refer to it, so nothing needs know about the name
11541 if (type
!= error_mark_node
11543 && TYPE_NAME (type
)
11544 && TREE_CODE (TYPE_NAME (type
)) == TYPE_DECL
11545 && TYPE_UNNAMED_P (type
)
11546 && declspecs
->type_definition_p
11547 && attributes_naming_typedef_ok (*attrlist
)
11548 && cp_type_quals (type
) == TYPE_UNQUALIFIED
)
11552 /* Replace the anonymous name with the real name everywhere. */
11553 for (t
= TYPE_MAIN_VARIANT (type
); t
; t
= TYPE_NEXT_VARIANT (t
))
11555 if (anon_aggrname_p (TYPE_IDENTIFIER (t
)))
11556 /* We do not rename the debug info representing the
11557 unnamed tagged type because the standard says in
11558 [dcl.typedef] that the naming applies only for
11559 linkage purposes. */
11560 /*debug_hooks->set_name (t, decl);*/
11561 TYPE_NAME (t
) = decl
;
11564 if (TYPE_LANG_SPECIFIC (type
))
11565 TYPE_WAS_UNNAMED (type
) = 1;
11567 /* If this is a typedef within a template class, the nested
11568 type is a (non-primary) template. The name for the
11569 template needs updating as well. */
11570 if (TYPE_LANG_SPECIFIC (type
) && CLASSTYPE_TEMPLATE_INFO (type
))
11571 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type
))
11572 = TYPE_IDENTIFIER (type
);
11574 /* Adjust linkage now that we aren't unnamed anymore. */
11575 reset_type_linkage (type
);
11577 /* FIXME remangle member functions; member functions of a
11578 type with external linkage have external linkage. */
11582 || (typedef_decl
&& C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl
)))
11583 C_TYPEDEF_EXPLICITLY_SIGNED (decl
) = 1;
11585 bad_specifiers (decl
, BSP_TYPE
, virtualp
,
11586 memfn_quals
!= TYPE_UNQUALIFIED
,
11587 inlinep
, friendp
, raises
!= NULL_TREE
);
11589 if (decl_spec_seq_has_spec_p (declspecs
, ds_alias
))
11590 /* Acknowledge that this was written:
11591 `using analias = atype;'. */
11592 TYPE_DECL_ALIAS_P (decl
) = 1;
11597 /* Detect the case of an array type of unspecified size
11598 which came, as such, direct from a typedef name.
11599 We must copy the type, so that the array's domain can be
11600 individually set by the object's initializer. */
11602 if (type
&& typedef_type
11603 && TREE_CODE (type
) == ARRAY_TYPE
&& !TYPE_DOMAIN (type
)
11604 && TYPE_MAIN_VARIANT (type
) == TYPE_MAIN_VARIANT (typedef_type
))
11605 type
= build_cplus_array_type (TREE_TYPE (type
), NULL_TREE
);
11607 /* Detect where we're using a typedef of function type to declare a
11608 function. PARMS will not be set, so we must create it now. */
11610 if (type
== typedef_type
&& TREE_CODE (type
) == FUNCTION_TYPE
)
11612 tree decls
= NULL_TREE
;
11615 for (args
= TYPE_ARG_TYPES (type
);
11616 args
&& args
!= void_list_node
;
11617 args
= TREE_CHAIN (args
))
11619 tree decl
= cp_build_parm_decl (NULL_TREE
, TREE_VALUE (args
));
11621 DECL_CHAIN (decl
) = decls
;
11625 parms
= nreverse (decls
);
11627 if (decl_context
!= TYPENAME
)
11629 /* The qualifiers on the function type become the qualifiers on
11630 the non-static member function. */
11631 memfn_quals
|= type_memfn_quals (type
);
11632 rqual
= type_memfn_rqual (type
);
11633 type_quals
= TYPE_UNQUALIFIED
;
11637 /* If this is a type name (such as, in a cast or sizeof),
11638 compute the type and return it now. */
11640 if (decl_context
== TYPENAME
)
11642 /* Note that here we don't care about type_quals. */
11644 /* Special case: "friend class foo" looks like a TYPENAME context. */
11649 error ("%<inline%> specified for friend class declaration");
11655 /* Don't allow friend declaration without a class-key. */
11656 if (TREE_CODE (type
) == TEMPLATE_TYPE_PARM
)
11657 permerror (input_location
, "template parameters cannot be friends");
11658 else if (TREE_CODE (type
) == TYPENAME_TYPE
)
11659 permerror (input_location
, "friend declaration requires class-key, "
11660 "i.e. %<friend class %T::%D%>",
11661 TYPE_CONTEXT (type
), TYPENAME_TYPE_FULLNAME (type
));
11663 permerror (input_location
, "friend declaration requires class-key, "
11664 "i.e. %<friend %#T%>",
11668 /* Only try to do this stuff if we didn't already give up. */
11669 if (type
!= integer_type_node
)
11671 /* A friendly class? */
11672 if (current_class_type
)
11673 make_friend_class (current_class_type
, TYPE_MAIN_VARIANT (type
),
11674 /*complain=*/true);
11676 error ("trying to make class %qT a friend of global scope",
11679 type
= void_type_node
;
11682 else if (memfn_quals
|| rqual
)
11684 if (ctype
== NULL_TREE
11685 && TREE_CODE (type
) == METHOD_TYPE
)
11686 ctype
= TYPE_METHOD_BASETYPE (type
);
11689 type
= build_memfn_type (type
, ctype
, memfn_quals
, rqual
);
11690 /* Core issue #547: need to allow this in template type args.
11691 Allow it in general in C++11 for alias-declarations. */
11692 else if ((template_type_arg
|| cxx_dialect
>= cxx11
)
11693 && TREE_CODE (type
) == FUNCTION_TYPE
)
11694 type
= apply_memfn_quals (type
, memfn_quals
, rqual
);
11696 error ("invalid qualifiers on non-member function type");
11700 error_at (location_of (reqs
), "requires-clause on type-id");
11704 else if (unqualified_id
== NULL_TREE
&& decl_context
!= PARM
11705 && decl_context
!= CATCHPARM
11706 && TREE_CODE (type
) != UNION_TYPE
11708 && innermost_code
!= cdk_decomp
)
11710 error ("abstract declarator %qT used as declaration", type
);
11711 return error_mark_node
;
11714 /* Only functions may be declared using an operator-function-id. */
11716 && IDENTIFIER_OPNAME_P (unqualified_id
)
11717 && TREE_CODE (type
) != FUNCTION_TYPE
11718 && TREE_CODE (type
) != METHOD_TYPE
)
11720 error ("declaration of %qD as non-function", unqualified_id
);
11721 return error_mark_node
;
11725 && TREE_CODE (type
) != FUNCTION_TYPE
11726 && TREE_CODE (type
) != METHOD_TYPE
)
11727 error_at (location_of (reqs
),
11728 "requires-clause on declaration of non-function type %qT",
11731 /* We don't check parameter types here because we can emit a better
11732 error message later. */
11733 if (decl_context
!= PARM
)
11735 type
= check_var_type (unqualified_id
, type
);
11736 if (type
== error_mark_node
)
11737 return error_mark_node
;
11740 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
11741 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
11743 if (decl_context
== PARM
|| decl_context
== CATCHPARM
)
11745 if (ctype
|| in_namespace
)
11746 error ("cannot use %<::%> in parameter declaration");
11748 if (type_uses_auto (type
)
11749 && !(cxx_dialect
>= cxx1z
&& template_parm_flag
))
11751 if (cxx_dialect
>= cxx14
)
11752 error ("%<auto%> parameter not permitted in this context");
11754 error ("parameter declared %<auto%>");
11755 type
= error_mark_node
;
11758 /* A parameter declared as an array of T is really a pointer to T.
11759 One declared as a function is really a pointer to a function.
11760 One declared as a member is really a pointer to member. */
11762 if (TREE_CODE (type
) == ARRAY_TYPE
)
11764 /* Transfer const-ness of array into that of type pointed to. */
11765 type
= build_pointer_type (TREE_TYPE (type
));
11766 type_quals
= TYPE_UNQUALIFIED
;
11767 array_parameter_p
= true;
11769 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
11770 type
= build_pointer_type (type
);
11773 if (ctype
&& TREE_CODE (type
) == FUNCTION_TYPE
&& staticp
< 2
11774 && !NEW_DELETE_OPNAME_P (unqualified_id
))
11776 cp_cv_quals real_quals
= memfn_quals
;
11777 if (cxx_dialect
< cxx14
&& constexpr_p
11778 && sfk
!= sfk_constructor
&& sfk
!= sfk_destructor
)
11779 real_quals
|= TYPE_QUAL_CONST
;
11780 type
= build_memfn_type (type
, ctype
, real_quals
, rqual
);
11784 tree decl
= NULL_TREE
;
11786 if (decl_context
== PARM
)
11788 decl
= cp_build_parm_decl (unqualified_id
, type
);
11789 DECL_ARRAY_PARAMETER_P (decl
) = array_parameter_p
;
11791 bad_specifiers (decl
, BSP_PARM
, virtualp
,
11792 memfn_quals
!= TYPE_UNQUALIFIED
,
11793 inlinep
, friendp
, raises
!= NULL_TREE
);
11795 else if (decl_context
== FIELD
)
11797 if (!staticp
&& !friendp
&& TREE_CODE (type
) != METHOD_TYPE
)
11798 if (tree auto_node
= type_uses_auto (type
))
11800 location_t loc
= declspecs
->locations
[ds_type_spec
];
11801 if (CLASS_PLACEHOLDER_TEMPLATE (auto_node
))
11802 error_at (loc
, "invalid use of template-name %qE without an "
11804 CLASS_PLACEHOLDER_TEMPLATE (auto_node
));
11806 error_at (loc
, "non-static data member declared with "
11807 "placeholder %qT", auto_node
);
11808 type
= error_mark_node
;
11811 /* The C99 flexible array extension. */
11812 if (!staticp
&& TREE_CODE (type
) == ARRAY_TYPE
11813 && TYPE_DOMAIN (type
) == NULL_TREE
)
11816 && (TREE_CODE (ctype
) == UNION_TYPE
11817 || TREE_CODE (ctype
) == QUAL_UNION_TYPE
))
11819 error ("flexible array member in union");
11820 type
= error_mark_node
;
11824 /* Array is a flexible member. */
11825 if (in_system_header_at (input_location
))
11826 /* Do not warn on flexible array members in system
11827 headers because glibc uses them. */;
11829 pedwarn (input_location
, OPT_Wpedantic
,
11830 "ISO C++ forbids flexible array member %<%s%>", name
);
11832 pedwarn (input_location
, OPT_Wpedantic
,
11833 "ISO C++ forbids flexible array members");
11835 /* Flexible array member has a null domain. */
11836 type
= build_cplus_array_type (TREE_TYPE (type
), NULL_TREE
);
11840 if (type
== error_mark_node
)
11842 /* Happens when declaring arrays of sizes which
11843 are error_mark_node, for example. */
11846 else if (in_namespace
&& !friendp
)
11848 /* Something like struct S { int N::j; }; */
11849 error ("invalid use of %<::%>");
11850 return error_mark_node
;
11852 else if (TREE_CODE (type
) == FUNCTION_TYPE
11853 || TREE_CODE (type
) == METHOD_TYPE
)
11856 tree function_context
;
11860 /* This should never happen in pure C++ (the check
11861 could be an assert). It could happen in
11862 Objective-C++ if someone writes invalid code that
11863 uses a function declaration for an instance
11864 variable or property (instance variables and
11865 properties are parsed as FIELD_DECLs, but they are
11866 part of an Objective-C class, not a C++ class).
11867 That code is invalid and is caught by this
11871 error ("declaration of function %qD in invalid context",
11873 return error_mark_node
;
11876 /* ``A union may [ ... ] not [ have ] virtual functions.''
11878 if (virtualp
&& TREE_CODE (ctype
) == UNION_TYPE
)
11880 error ("function %qD declared %<virtual%> inside a union",
11882 return error_mark_node
;
11885 if (NEW_DELETE_OPNAME_P (unqualified_id
))
11889 error ("%qD cannot be declared %<virtual%>, since it "
11890 "is always static",
11897 /* Check that the name used for a destructor makes sense. */
11898 if (sfk
== sfk_destructor
)
11900 tree uqname
= id_declarator
->u
.id
.unqualified_name
;
11904 gcc_assert (friendp
);
11905 error ("expected qualified name in friend declaration "
11906 "for destructor %qD", uqname
);
11907 return error_mark_node
;
11910 if (!check_dtor_name (ctype
, TREE_OPERAND (uqname
, 0)))
11912 error ("declaration of %qD as member of %qT",
11914 return error_mark_node
;
11918 error ("a destructor cannot be %<concept%>");
11919 return error_mark_node
;
11923 error ("a destructor cannot be %<constexpr%>");
11924 return error_mark_node
;
11927 else if (sfk
== sfk_constructor
&& friendp
&& !ctype
)
11929 error ("expected qualified name in friend declaration "
11930 "for constructor %qD",
11931 id_declarator
->u
.id
.unqualified_name
);
11932 return error_mark_node
;
11934 if (sfk
== sfk_constructor
)
11937 error ("a constructor cannot be %<concept%>");
11938 return error_mark_node
;
11942 error ("a concept cannot be a member function");
11946 if (TREE_CODE (unqualified_id
) == TEMPLATE_ID_EXPR
)
11948 tree tmpl
= TREE_OPERAND (unqualified_id
, 0);
11949 if (variable_template_p (tmpl
))
11951 error ("specialization of variable template %qD "
11952 "declared as function", tmpl
);
11953 inform (DECL_SOURCE_LOCATION (tmpl
),
11954 "variable template declared here");
11955 return error_mark_node
;
11959 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
11960 function_context
= (ctype
!= NULL_TREE
) ?
11961 decl_function_context (TYPE_MAIN_DECL (ctype
)) : NULL_TREE
;
11962 publicp
= (! friendp
|| ! staticp
)
11963 && function_context
== NULL_TREE
;
11965 if (late_return_type_p
)
11966 TYPE_HAS_LATE_RETURN_TYPE (type
) = 1;
11968 decl
= grokfndecl (ctype
, type
,
11969 TREE_CODE (unqualified_id
) != TEMPLATE_ID_EXPR
11970 ? unqualified_id
: dname
,
11974 virtualp
, flags
, memfn_quals
, rqual
, raises
,
11975 friendp
? -1 : 0, friendp
, publicp
,
11976 inlinep
| (2 * constexpr_p
) | (4 * concept_p
),
11977 initialized
== SD_DELETED
, sfk
,
11978 funcdef_flag
, template_count
, in_namespace
,
11979 attrlist
, declarator
->id_loc
);
11980 decl
= set_virt_specifiers (decl
, virt_specifiers
);
11981 if (decl
== NULL_TREE
)
11982 return error_mark_node
;
11984 /* This clobbers the attrs stored in `decl' from `attrlist'. */
11985 /* The decl and setting of decl_attr is also turned off. */
11986 decl
= build_decl_attribute_variant (decl
, decl_attr
);
11989 /* [class.conv.ctor]
11991 A constructor declared without the function-specifier
11992 explicit that can be called with a single parameter
11993 specifies a conversion from the type of its first
11994 parameter to the type of its class. Such a constructor
11995 is called a converting constructor. */
11996 if (explicitp
== 2)
11997 DECL_NONCONVERTING_P (decl
) = 1;
11999 else if (!staticp
&& !dependent_type_p (type
)
12000 && !COMPLETE_TYPE_P (complete_type (type
))
12001 && (!complete_or_array_type_p (type
)
12002 || initialized
== 0))
12004 if (TREE_CODE (type
) != ARRAY_TYPE
12005 || !COMPLETE_TYPE_P (TREE_TYPE (type
)))
12007 if (unqualified_id
)
12009 error ("field %qD has incomplete type %qT",
12010 unqualified_id
, type
);
12011 cxx_incomplete_type_inform (strip_array_types (type
));
12014 error ("name %qT has incomplete type", type
);
12016 type
= error_mark_node
;
12024 error ("%qE is neither function nor member function; "
12025 "cannot be declared friend", unqualified_id
);
12033 /* Friends are treated specially. */
12034 if (ctype
== current_class_type
)
12035 ; /* We already issued a permerror. */
12036 else if (decl
&& DECL_NAME (decl
))
12038 if (template_class_depth (current_class_type
) == 0)
12040 decl
= check_explicit_specialization
12041 (unqualified_id
, decl
, template_count
,
12042 2 * funcdef_flag
+ 4);
12043 if (decl
== error_mark_node
)
12044 return error_mark_node
;
12047 decl
= do_friend (ctype
, unqualified_id
, decl
,
12053 return error_mark_node
;
12056 /* Structure field. It may not be a function, except for C++. */
12058 if (decl
== NULL_TREE
)
12062 /* C++ allows static class members. All other work
12063 for this is done by grokfield. */
12064 decl
= build_lang_decl_loc (declarator
12065 ? declarator
->id_loc
12067 VAR_DECL
, unqualified_id
, type
);
12068 set_linkage_for_static_data_member (decl
);
12070 error ("static data member %qE declared %<concept%>",
12072 else if (constexpr_p
&& !initialized
)
12074 error ("constexpr static data member %qD must have an "
12075 "initializer", decl
);
12076 constexpr_p
= false;
12080 mark_inline_variable (decl
);
12082 if (!DECL_VAR_DECLARED_INLINE_P (decl
)
12083 && !(cxx_dialect
>= cxx1z
&& constexpr_p
))
12084 /* Even if there is an in-class initialization, DECL
12085 is considered undefined until an out-of-class
12086 definition is provided, unless this is an inline
12088 DECL_EXTERNAL (decl
) = 1;
12092 CP_DECL_THREAD_LOCAL_P (decl
) = true;
12093 if (!processing_template_decl
)
12094 set_decl_tls_model (decl
, decl_default_tls_model (decl
));
12095 if (declspecs
->gnu_thread_keyword_p
)
12096 SET_DECL_GNU_TLS_P (decl
);
12102 error ("non-static data member %qE declared %<concept%>",
12104 else if (constexpr_p
)
12106 error ("non-static data member %qE declared %<constexpr%>",
12108 constexpr_p
= false;
12110 decl
= build_decl (input_location
,
12111 FIELD_DECL
, unqualified_id
, type
);
12112 DECL_NONADDRESSABLE_P (decl
) = bitfield
;
12113 if (bitfield
&& !unqualified_id
)
12114 TREE_NO_WARNING (decl
) = 1;
12116 if (storage_class
== sc_mutable
)
12118 DECL_MUTABLE_P (decl
) = 1;
12119 storage_class
= sc_none
;
12124 /* An attempt is being made to initialize a non-static
12125 member. This is new in C++11. */
12126 maybe_warn_cpp0x (CPP0X_NSDMI
);
12128 /* If this has been parsed with static storage class, but
12129 errors forced staticp to be cleared, ensure NSDMI is
12131 if (declspecs
->storage_class
== sc_static
)
12132 DECL_INITIAL (decl
) = error_mark_node
;
12136 bad_specifiers (decl
, BSP_FIELD
, virtualp
,
12137 memfn_quals
!= TYPE_UNQUALIFIED
,
12138 staticp
? false : inlinep
, friendp
,
12139 raises
!= NULL_TREE
);
12142 else if (TREE_CODE (type
) == FUNCTION_TYPE
12143 || TREE_CODE (type
) == METHOD_TYPE
)
12145 tree original_name
;
12148 if (!unqualified_id
)
12149 return error_mark_node
;
12151 if (TREE_CODE (unqualified_id
) == TEMPLATE_ID_EXPR
)
12152 original_name
= dname
;
12154 original_name
= unqualified_id
;
12156 if (storage_class
== sc_auto
)
12157 error ("storage class %<auto%> invalid for function %qs", name
);
12158 else if (storage_class
== sc_register
)
12159 error ("storage class %<register%> invalid for function %qs", name
);
12162 if (declspecs
->gnu_thread_keyword_p
)
12163 error ("storage class %<__thread%> invalid for function %qs",
12166 error ("storage class %<thread_local%> invalid for function %qs",
12170 if (virt_specifiers
)
12171 error ("virt-specifiers in %qs not allowed outside a class definition", name
);
12172 /* Function declaration not at top level.
12173 Storage classes other than `extern' are not allowed
12174 and `extern' makes no difference. */
12175 if (! toplevel_bindings_p ()
12176 && (storage_class
== sc_static
12177 || decl_spec_seq_has_spec_p (declspecs
, ds_inline
))
12180 if (storage_class
== sc_static
)
12181 pedwarn (input_location
, OPT_Wpedantic
,
12182 "%<static%> specifier invalid for function %qs "
12183 "declared out of global scope", name
);
12185 pedwarn (input_location
, OPT_Wpedantic
,
12186 "%<inline%> specifier invalid for function %qs "
12187 "declared out of global scope", name
);
12190 if (ctype
== NULL_TREE
)
12194 error ("virtual non-class function %qs", name
);
12197 else if (sfk
== sfk_constructor
12198 || sfk
== sfk_destructor
)
12200 error (funcdef_flag
12201 ? G_("%qs defined in a non-class scope")
12202 : G_("%qs declared in a non-class scope"), name
);
12207 /* Record whether the function is public. */
12208 publicp
= (ctype
!= NULL_TREE
12209 || storage_class
!= sc_static
);
12211 if (late_return_type_p
)
12212 TYPE_HAS_LATE_RETURN_TYPE (type
) = 1;
12214 decl
= grokfndecl (ctype
, type
, original_name
, parms
, unqualified_id
,
12215 reqs
, virtualp
, flags
, memfn_quals
, rqual
, raises
,
12218 inlinep
| (2 * constexpr_p
) | (4 * concept_p
),
12219 initialized
== SD_DELETED
,
12222 template_count
, in_namespace
, attrlist
,
12223 declarator
->id_loc
);
12224 if (decl
== NULL_TREE
)
12225 return error_mark_node
;
12227 if (explicitp
== 2)
12228 DECL_NONCONVERTING_P (decl
) = 1;
12231 int invalid_static
= 0;
12233 /* Don't allow a static member function in a class, and forbid
12234 declaring main to be static. */
12235 if (TREE_CODE (type
) == METHOD_TYPE
)
12237 permerror (input_location
, "cannot declare member function %qD to have "
12238 "static linkage", decl
);
12239 invalid_static
= 1;
12241 else if (current_function_decl
)
12243 /* 7.1.1: There can be no static function declarations within a
12245 error ("cannot declare static function inside another function");
12246 invalid_static
= 1;
12249 if (invalid_static
)
12252 storage_class
= sc_none
;
12258 /* It's a variable. */
12260 /* An uninitialized decl with `extern' is a reference. */
12261 decl
= grokvardecl (type
, dname
, unqualified_id
,
12268 ctype
? ctype
: in_namespace
);
12269 if (decl
== NULL_TREE
)
12270 return error_mark_node
;
12272 bad_specifiers (decl
, BSP_VAR
, virtualp
,
12273 memfn_quals
!= TYPE_UNQUALIFIED
,
12274 inlinep
, friendp
, raises
!= NULL_TREE
);
12278 DECL_CONTEXT (decl
) = ctype
;
12281 permerror (input_location
, "%<static%> may not be used when defining "
12282 "(as opposed to declaring) a static data member");
12284 storage_class
= sc_none
;
12286 if (storage_class
== sc_register
&& TREE_STATIC (decl
))
12288 error ("static member %qD declared %<register%>", decl
);
12289 storage_class
= sc_none
;
12291 if (storage_class
== sc_extern
&& pedantic
)
12293 pedwarn (input_location
, OPT_Wpedantic
,
12294 "cannot explicitly declare member %q#D to have "
12295 "extern linkage", decl
);
12296 storage_class
= sc_none
;
12299 else if (constexpr_p
&& DECL_EXTERNAL (decl
))
12301 error ("declaration of constexpr variable %qD is not a definition",
12303 constexpr_p
= false;
12307 mark_inline_variable (decl
);
12308 if (innermost_code
== cdk_decomp
)
12310 gcc_assert (declarator
&& declarator
->kind
== cdk_decomp
);
12311 DECL_SOURCE_LOCATION (decl
) = declarator
->id_loc
;
12312 retrofit_lang_decl (decl
);
12313 DECL_ARTIFICIAL (decl
) = 1;
12314 SET_DECL_DECOMPOSITION_P (decl
);
12318 if (VAR_P (decl
) && !initialized
)
12319 if (tree auto_node
= type_uses_auto (type
))
12321 location_t loc
= declspecs
->locations
[ds_type_spec
];
12322 if (tree tmpl
= CLASS_PLACEHOLDER_TEMPLATE (auto_node
))
12324 error_at (loc
, "invalid use of template-name %qE without an "
12325 "argument list", tmpl
);
12326 inform (loc
, "class template argument deduction "
12327 "requires an initializer");
12330 error_at (loc
, "declaration of %q#D has no initializer", decl
);
12331 TREE_TYPE (decl
) = error_mark_node
;
12334 if (storage_class
== sc_extern
&& initialized
&& !funcdef_flag
)
12336 if (toplevel_bindings_p ())
12338 /* It's common practice (and completely valid) to have a const
12339 be initialized and declared extern. */
12340 if (!(type_quals
& TYPE_QUAL_CONST
))
12341 warning (0, "%qs initialized and declared %<extern%>", name
);
12345 error ("%qs has both %<extern%> and initializer", name
);
12346 return error_mark_node
;
12350 /* Record `register' declaration for warnings on &
12351 and in case doing stupid register allocation. */
12353 if (storage_class
== sc_register
)
12355 DECL_REGISTER (decl
) = 1;
12356 /* Warn about register storage specifiers on PARM_DECLs. */
12357 if (TREE_CODE (decl
) == PARM_DECL
)
12359 if (cxx_dialect
>= cxx1z
)
12360 pedwarn (DECL_SOURCE_LOCATION (decl
), OPT_Wregister
,
12361 "ISO C++1z does not allow %<register%> storage "
12362 "class specifier");
12364 warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wregister
,
12365 "%<register%> storage class specifier used");
12368 else if (storage_class
== sc_extern
)
12369 DECL_THIS_EXTERN (decl
) = 1;
12370 else if (storage_class
== sc_static
)
12371 DECL_THIS_STATIC (decl
) = 1;
12373 /* Set constexpr flag on vars (functions got it in grokfndecl). */
12374 if (constexpr_p
&& VAR_P (decl
))
12375 DECL_DECLARED_CONSTEXPR_P (decl
) = true;
12377 /* Record constancy and volatility on the DECL itself . There's
12378 no need to do this when processing a template; we'll do this
12379 for the instantiated declaration based on the type of DECL. */
12380 if (!processing_template_decl
)
12381 cp_apply_type_quals_to_decl (type_quals
, decl
);
12387 /* Subroutine of start_function. Ensure that each of the parameter
12388 types (as listed in PARMS) is complete, as is required for a
12389 function definition. */
12392 require_complete_types_for_parms (tree parms
)
12394 for (; parms
; parms
= DECL_CHAIN (parms
))
12396 if (dependent_type_p (TREE_TYPE (parms
)))
12398 if (!VOID_TYPE_P (TREE_TYPE (parms
))
12399 && complete_type_or_else (TREE_TYPE (parms
), parms
))
12401 relayout_decl (parms
);
12402 DECL_ARG_TYPE (parms
) = type_passed_as (TREE_TYPE (parms
));
12405 /* grokparms or complete_type_or_else will have already issued
12407 TREE_TYPE (parms
) = error_mark_node
;
12411 /* Returns nonzero if T is a local variable. */
12414 local_variable_p (const_tree t
)
12417 /* A VAR_DECL with a context that is a _TYPE is a static data
12419 && !TYPE_P (CP_DECL_CONTEXT (t
))
12420 /* Any other non-local variable must be at namespace scope. */
12421 && !DECL_NAMESPACE_SCOPE_P (t
))
12422 || (TREE_CODE (t
) == PARM_DECL
))
12428 /* Like local_variable_p, but suitable for use as a tree-walking
12432 local_variable_p_walkfn (tree
*tp
, int *walk_subtrees
,
12435 if (local_variable_p (*tp
)
12436 && (!DECL_ARTIFICIAL (*tp
) || DECL_NAME (*tp
) == this_identifier
))
12438 else if (TYPE_P (*tp
))
12439 *walk_subtrees
= 0;
12444 /* Check that ARG, which is a default-argument expression for a
12445 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
12446 something goes wrong. DECL may also be a _TYPE node, rather than a
12447 DECL, if there is no DECL available. */
12450 check_default_argument (tree decl
, tree arg
, tsubst_flags_t complain
)
12455 if (TREE_CODE (arg
) == DEFAULT_ARG
)
12456 /* We get a DEFAULT_ARG when looking at an in-class declaration
12457 with a default argument. Ignore the argument for now; we'll
12458 deal with it after the class is complete. */
12467 decl_type
= TREE_TYPE (decl
);
12469 if (arg
== error_mark_node
12470 || decl
== error_mark_node
12471 || TREE_TYPE (arg
) == error_mark_node
12472 || decl_type
== error_mark_node
)
12473 /* Something already went wrong. There's no need to check
12475 return error_mark_node
;
12477 /* [dcl.fct.default]
12479 A default argument expression is implicitly converted to the
12481 ++cp_unevaluated_operand
;
12482 perform_implicit_conversion_flags (decl_type
, arg
, complain
,
12484 --cp_unevaluated_operand
;
12486 /* Avoid redundant -Wzero-as-null-pointer-constant warnings at
12488 if (TYPE_PTR_OR_PTRMEM_P (decl_type
)
12489 && null_ptr_cst_p (arg
))
12490 return nullptr_node
;
12492 /* [dcl.fct.default]
12494 Local variables shall not be used in default argument
12497 The keyword `this' shall not be used in a default argument of a
12498 member function. */
12499 var
= cp_walk_tree_without_duplicates (&arg
, local_variable_p_walkfn
, NULL
);
12502 if (complain
& tf_warning_or_error
)
12504 if (DECL_NAME (var
) == this_identifier
)
12505 permerror (input_location
, "default argument %qE uses %qD",
12508 error ("default argument %qE uses local variable %qD", arg
, var
);
12510 return error_mark_node
;
12517 /* Returns a deprecated type used within TYPE, or NULL_TREE if none. */
12520 type_is_deprecated (tree type
)
12522 enum tree_code code
;
12523 if (TREE_DEPRECATED (type
))
12525 if (TYPE_NAME (type
))
12527 if (TREE_DEPRECATED (TYPE_NAME (type
)))
12533 /* Do warn about using typedefs to a deprecated class. */
12534 if (OVERLOAD_TYPE_P (type
) && type
!= TYPE_MAIN_VARIANT (type
))
12535 return type_is_deprecated (TYPE_MAIN_VARIANT (type
));
12537 code
= TREE_CODE (type
);
12539 if (code
== POINTER_TYPE
|| code
== REFERENCE_TYPE
12540 || code
== OFFSET_TYPE
|| code
== FUNCTION_TYPE
12541 || code
== METHOD_TYPE
|| code
== ARRAY_TYPE
)
12542 return type_is_deprecated (TREE_TYPE (type
));
12544 if (TYPE_PTRMEMFUNC_P (type
))
12545 return type_is_deprecated
12546 (TREE_TYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (type
))));
12551 /* Decode the list of parameter types for a function type.
12552 Given the list of things declared inside the parens,
12553 return a list of types.
12555 If this parameter does not end with an ellipsis, we append
12558 *PARMS is set to the chain of PARM_DECLs created. */
12561 grokparms (tree parmlist
, tree
*parms
)
12563 tree result
= NULL_TREE
;
12564 tree decls
= NULL_TREE
;
12568 for (parm
= parmlist
; parm
!= NULL_TREE
; parm
= TREE_CHAIN (parm
))
12570 tree type
= NULL_TREE
;
12571 tree init
= TREE_PURPOSE (parm
);
12572 tree decl
= TREE_VALUE (parm
);
12574 if (parm
== void_list_node
)
12577 if (! decl
|| TREE_TYPE (decl
) == error_mark_node
)
12580 type
= TREE_TYPE (decl
);
12581 if (VOID_TYPE_P (type
))
12583 if (same_type_p (type
, void_type_node
)
12585 && !DECL_NAME (decl
) && !result
12586 && TREE_CHAIN (parm
) == void_list_node
)
12587 /* DR 577: A parameter list consisting of a single
12588 unnamed parameter of non-dependent type 'void'. */
12590 else if (cv_qualified_p (type
))
12591 error_at (DECL_SOURCE_LOCATION (decl
),
12592 "invalid use of cv-qualified type %qT in "
12593 "parameter declaration", type
);
12595 error_at (DECL_SOURCE_LOCATION (decl
),
12596 "invalid use of type %<void%> in parameter "
12598 /* It's not a good idea to actually create parameters of
12599 type `void'; other parts of the compiler assume that a
12600 void type terminates the parameter list. */
12601 type
= error_mark_node
;
12602 TREE_TYPE (decl
) = error_mark_node
;
12605 if (type
!= error_mark_node
)
12607 if (deprecated_state
!= DEPRECATED_SUPPRESS
)
12609 tree deptype
= type_is_deprecated (type
);
12611 warn_deprecated_use (deptype
, NULL_TREE
);
12614 /* Top-level qualifiers on the parameters are
12615 ignored for function types. */
12616 type
= cp_build_qualified_type (type
, 0);
12617 if (TREE_CODE (type
) == METHOD_TYPE
)
12619 error ("parameter %qD invalidly declared method type", decl
);
12620 type
= build_pointer_type (type
);
12621 TREE_TYPE (decl
) = type
;
12623 else if (abstract_virtuals_error (decl
, type
))
12624 any_error
= 1; /* Seems like a good idea. */
12625 else if (POINTER_TYPE_P (type
))
12627 /* [dcl.fct]/6, parameter types cannot contain pointers
12628 (references) to arrays of unknown bound. */
12629 tree t
= TREE_TYPE (type
);
12630 int ptr
= TYPE_PTR_P (type
);
12634 if (TYPE_PTR_P (t
))
12636 else if (TREE_CODE (t
) != ARRAY_TYPE
)
12638 else if (!TYPE_DOMAIN (t
))
12642 if (TREE_CODE (t
) == ARRAY_TYPE
)
12644 ? G_("parameter %qD includes pointer to array of "
12645 "unknown bound %qT")
12646 : G_("parameter %qD includes reference to array of "
12647 "unknown bound %qT"),
12653 else if (init
&& !processing_template_decl
)
12654 init
= check_default_argument (decl
, init
, tf_warning_or_error
);
12657 DECL_CHAIN (decl
) = decls
;
12659 result
= tree_cons (init
, type
, result
);
12661 decls
= nreverse (decls
);
12662 result
= nreverse (result
);
12664 result
= chainon (result
, void_list_node
);
12671 /* D is a constructor or overloaded `operator='.
12673 Let T be the class in which D is declared. Then, this function
12676 -1 if D's is an ill-formed constructor or copy assignment operator
12677 whose first parameter is of type `T'.
12678 0 if D is not a copy constructor or copy assignment
12680 1 if D is a copy constructor or copy assignment operator whose
12681 first parameter is a reference to non-const qualified T.
12682 2 if D is a copy constructor or copy assignment operator whose
12683 first parameter is a reference to const qualified T.
12685 This function can be used as a predicate. Positive values indicate
12686 a copy constructor and nonzero values indicate a copy assignment
12690 copy_fn_p (const_tree d
)
12696 gcc_assert (DECL_FUNCTION_MEMBER_P (d
));
12698 if (TREE_CODE (d
) == TEMPLATE_DECL
12699 || (DECL_TEMPLATE_INFO (d
)
12700 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d
))))
12701 /* Instantiations of template member functions are never copy
12702 functions. Note that member functions of templated classes are
12703 represented as template functions internally, and we must
12704 accept those as copy functions. */
12707 args
= FUNCTION_FIRST_USER_PARMTYPE (d
);
12711 arg_type
= TREE_VALUE (args
);
12712 if (arg_type
== error_mark_node
)
12715 if (TYPE_MAIN_VARIANT (arg_type
) == DECL_CONTEXT (d
))
12717 /* Pass by value copy assignment operator. */
12720 else if (TREE_CODE (arg_type
) == REFERENCE_TYPE
12721 && !TYPE_REF_IS_RVALUE (arg_type
)
12722 && TYPE_MAIN_VARIANT (TREE_TYPE (arg_type
)) == DECL_CONTEXT (d
))
12724 if (CP_TYPE_CONST_P (TREE_TYPE (arg_type
)))
12730 args
= TREE_CHAIN (args
);
12732 if (args
&& args
!= void_list_node
&& !TREE_PURPOSE (args
))
12733 /* There are more non-optional args. */
12739 /* D is a constructor or overloaded `operator='.
12741 Let T be the class in which D is declared. Then, this function
12742 returns true when D is a move constructor or move assignment
12743 operator, false otherwise. */
12746 move_fn_p (const_tree d
)
12748 gcc_assert (DECL_FUNCTION_MEMBER_P (d
));
12750 if (cxx_dialect
== cxx98
)
12751 /* There are no move constructors if we are in C++98 mode. */
12754 if (TREE_CODE (d
) == TEMPLATE_DECL
12755 || (DECL_TEMPLATE_INFO (d
)
12756 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d
))))
12757 /* Instantiations of template member functions are never move
12758 functions. Note that member functions of templated classes are
12759 represented as template functions internally, and we must
12760 accept those as move functions. */
12763 return move_signature_fn_p (d
);
12766 /* D is a constructor or overloaded `operator='.
12768 Then, this function returns true when D has the same signature as a move
12769 constructor or move assignment operator (because either it is such a
12770 ctor/op= or it is a template specialization with the same signature),
12771 false otherwise. */
12774 move_signature_fn_p (const_tree d
)
12778 bool result
= false;
12780 args
= FUNCTION_FIRST_USER_PARMTYPE (d
);
12784 arg_type
= TREE_VALUE (args
);
12785 if (arg_type
== error_mark_node
)
12788 if (TREE_CODE (arg_type
) == REFERENCE_TYPE
12789 && TYPE_REF_IS_RVALUE (arg_type
)
12790 && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (arg_type
)),
12794 args
= TREE_CHAIN (args
);
12796 if (args
&& args
!= void_list_node
&& !TREE_PURPOSE (args
))
12797 /* There are more non-optional args. */
12803 /* Remember any special properties of member function DECL. */
12806 grok_special_member_properties (tree decl
)
12810 if (!DECL_NONSTATIC_MEMBER_FUNCTION_P (decl
))
12813 class_type
= DECL_CONTEXT (decl
);
12814 if (DECL_CONSTRUCTOR_P (decl
))
12816 int ctor
= copy_fn_p (decl
);
12818 if (!DECL_ARTIFICIAL (decl
))
12819 TYPE_HAS_USER_CONSTRUCTOR (class_type
) = 1;
12825 A non-template constructor for class X is a copy
12826 constructor if its first parameter is of type X&, const
12827 X&, volatile X& or const volatile X&, and either there
12828 are no other parameters or else all other parameters have
12829 default arguments. */
12830 TYPE_HAS_COPY_CTOR (class_type
) = 1;
12831 if (user_provided_p (decl
))
12832 TYPE_HAS_COMPLEX_COPY_CTOR (class_type
) = 1;
12834 TYPE_HAS_CONST_COPY_CTOR (class_type
) = 1;
12836 else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl
)))
12837 TYPE_HAS_DEFAULT_CONSTRUCTOR (class_type
) = 1;
12838 else if (move_fn_p (decl
) && user_provided_p (decl
))
12839 TYPE_HAS_COMPLEX_MOVE_CTOR (class_type
) = 1;
12840 else if (is_list_ctor (decl
))
12841 TYPE_HAS_LIST_CTOR (class_type
) = 1;
12843 if (DECL_DECLARED_CONSTEXPR_P (decl
)
12844 && !copy_fn_p (decl
) && !move_fn_p (decl
))
12845 TYPE_HAS_CONSTEXPR_CTOR (class_type
) = 1;
12847 else if (DECL_OVERLOADED_OPERATOR_P (decl
) == NOP_EXPR
)
12851 A non-template assignment operator for class X is a copy
12852 assignment operator if its parameter is of type X, X&, const
12853 X&, volatile X& or const volatile X&. */
12855 int assop
= copy_fn_p (decl
);
12859 TYPE_HAS_COPY_ASSIGN (class_type
) = 1;
12860 if (user_provided_p (decl
))
12861 TYPE_HAS_COMPLEX_COPY_ASSIGN (class_type
) = 1;
12863 TYPE_HAS_CONST_COPY_ASSIGN (class_type
) = 1;
12865 else if (move_fn_p (decl
) && user_provided_p (decl
))
12866 TYPE_HAS_COMPLEX_MOVE_ASSIGN (class_type
) = 1;
12868 /* Destructors are handled in check_methods. */
12871 /* Check a constructor DECL has the correct form. Complains
12872 if the class has a constructor of the form X(X). */
12875 grok_ctor_properties (const_tree ctype
, const_tree decl
)
12877 int ctor_parm
= copy_fn_p (decl
);
12883 A declaration of a constructor for a class X is ill-formed if
12884 its first parameter is of type (optionally cv-qualified) X
12885 and either there are no other parameters or else all other
12886 parameters have default arguments.
12888 We *don't* complain about member template instantiations that
12889 have this form, though; they can occur as we try to decide
12890 what constructor to use during overload resolution. Since
12891 overload resolution will never prefer such a constructor to
12892 the non-template copy constructor (which is either explicitly
12893 or implicitly defined), there's no need to worry about their
12894 existence. Theoretically, they should never even be
12895 instantiated, but that's hard to forestall. */
12896 error ("invalid constructor; you probably meant %<%T (const %T&)%>",
12904 /* An operator with this code is unary, but can also be binary. */
12907 ambi_op_p (enum tree_code code
)
12909 return (code
== INDIRECT_REF
12910 || code
== ADDR_EXPR
12911 || code
== UNARY_PLUS_EXPR
12912 || code
== NEGATE_EXPR
12913 || code
== PREINCREMENT_EXPR
12914 || code
== PREDECREMENT_EXPR
);
12917 /* An operator with this name can only be unary. */
12920 unary_op_p (enum tree_code code
)
12922 return (code
== TRUTH_NOT_EXPR
12923 || code
== BIT_NOT_EXPR
12924 || code
== COMPONENT_REF
12925 || code
== TYPE_EXPR
);
12928 /* DECL is a declaration for an overloaded operator. If COMPLAIN is true,
12929 errors are issued for invalid declarations. */
12932 grok_op_properties (tree decl
, bool complain
)
12934 tree argtypes
= TYPE_ARG_TYPES (TREE_TYPE (decl
));
12936 int methodp
= (TREE_CODE (TREE_TYPE (decl
)) == METHOD_TYPE
);
12937 tree name
= DECL_NAME (decl
);
12938 enum tree_code operator_code
;
12943 /* Count the number of arguments and check for ellipsis. */
12944 for (argtype
= argtypes
, arity
= 0;
12945 argtype
&& argtype
!= void_list_node
;
12946 argtype
= TREE_CHAIN (argtype
))
12948 ellipsis_p
= !argtype
;
12950 class_type
= DECL_CONTEXT (decl
);
12951 if (class_type
&& !CLASS_TYPE_P (class_type
))
12952 class_type
= NULL_TREE
;
12954 if (DECL_CONV_FN_P (decl
))
12955 operator_code
= TYPE_EXPR
;
12959 #define DEF_OPERATOR(NAME, CODE, MANGLING, ARITY, ASSN_P) \
12960 if (cp_operator_id (CODE) == name) \
12962 operator_code = (CODE); \
12965 else if (cp_assignment_operator_id (CODE) == name) \
12967 operator_code = (CODE); \
12968 DECL_ASSIGNMENT_OPERATOR_P (decl) = 1; \
12972 #include "operators.def"
12973 #undef DEF_OPERATOR
12975 gcc_unreachable ();
12978 gcc_assert (operator_code
!= MAX_TREE_CODES
);
12979 SET_OVERLOADED_OPERATOR_CODE (decl
, operator_code
);
12982 switch (operator_code
)
12985 TYPE_HAS_NEW_OPERATOR (class_type
) = 1;
12989 TYPE_GETS_DELETE (class_type
) |= 1;
12993 TYPE_HAS_ARRAY_NEW_OPERATOR (class_type
) = 1;
12996 case VEC_DELETE_EXPR
:
12997 TYPE_GETS_DELETE (class_type
) |= 2;
13004 /* [basic.std.dynamic.allocation]/1:
13006 A program is ill-formed if an allocation function is declared
13007 in a namespace scope other than global scope or declared static
13010 The same also holds true for deallocation functions. */
13011 if (operator_code
== NEW_EXPR
|| operator_code
== VEC_NEW_EXPR
13012 || operator_code
== DELETE_EXPR
|| operator_code
== VEC_DELETE_EXPR
)
13014 if (DECL_NAMESPACE_SCOPE_P (decl
))
13016 if (CP_DECL_CONTEXT (decl
) != global_namespace
)
13018 error ("%qD may not be declared within a namespace", decl
);
13021 else if (!TREE_PUBLIC (decl
))
13023 error ("%qD may not be declared as static", decl
);
13029 if (operator_code
== NEW_EXPR
|| operator_code
== VEC_NEW_EXPR
)
13031 TREE_TYPE (decl
) = coerce_new_type (TREE_TYPE (decl
));
13032 DECL_IS_OPERATOR_NEW (decl
) = 1;
13034 else if (operator_code
== DELETE_EXPR
|| operator_code
== VEC_DELETE_EXPR
)
13035 TREE_TYPE (decl
) = coerce_delete_type (TREE_TYPE (decl
));
13038 /* An operator function must either be a non-static member function
13039 or have at least one parameter of a class, a reference to a class,
13040 an enumeration, or a reference to an enumeration. 13.4.0.6 */
13041 if (! methodp
|| DECL_STATIC_FUNCTION_P (decl
))
13043 if (operator_code
== TYPE_EXPR
13044 || operator_code
== CALL_EXPR
13045 || operator_code
== COMPONENT_REF
13046 || operator_code
== ARRAY_REF
13047 || operator_code
== NOP_EXPR
)
13049 error ("%qD must be a nonstatic member function", decl
);
13056 if (DECL_STATIC_FUNCTION_P (decl
))
13058 error ("%qD must be either a non-static member "
13059 "function or a non-member function", decl
);
13063 for (p
= argtypes
; p
&& p
!= void_list_node
; p
= TREE_CHAIN (p
))
13065 tree arg
= non_reference (TREE_VALUE (p
));
13066 if (arg
== error_mark_node
)
13069 /* MAYBE_CLASS_TYPE_P, rather than CLASS_TYPE_P, is used
13070 because these checks are performed even on
13071 template functions. */
13072 if (MAYBE_CLASS_TYPE_P (arg
)
13073 || TREE_CODE (arg
) == ENUMERAL_TYPE
)
13077 if (!p
|| p
== void_list_node
)
13080 error ("%qD must have an argument of class or "
13081 "enumerated type", decl
);
13087 /* There are no restrictions on the arguments to an overloaded
13089 if (operator_code
== CALL_EXPR
)
13092 /* Warn about conversion operators that will never be used. */
13093 if (IDENTIFIER_TYPENAME_P (name
)
13094 && ! DECL_TEMPLATE_INFO (decl
)
13096 /* Warn only declaring the function; there is no need to
13097 warn again about out-of-class definitions. */
13098 && class_type
== current_class_type
)
13100 tree t
= TREE_TYPE (name
);
13101 int ref
= (TREE_CODE (t
) == REFERENCE_TYPE
);
13104 t
= TYPE_MAIN_VARIANT (TREE_TYPE (t
));
13106 if (VOID_TYPE_P (t
))
13107 warning (OPT_Wconversion
,
13109 ? G_("conversion to a reference to void "
13110 "will never use a type conversion operator")
13111 : G_("conversion to void "
13112 "will never use a type conversion operator"));
13113 else if (class_type
)
13115 if (t
== class_type
)
13116 warning (OPT_Wconversion
,
13118 ? G_("conversion to a reference to the same type "
13119 "will never use a type conversion operator")
13120 : G_("conversion to the same type "
13121 "will never use a type conversion operator"));
13122 /* Don't force t to be complete here. */
13123 else if (MAYBE_CLASS_TYPE_P (t
)
13124 && COMPLETE_TYPE_P (t
)
13125 && DERIVED_FROM_P (t
, class_type
))
13126 warning (OPT_Wconversion
,
13128 ? G_("conversion to a reference to a base class "
13129 "will never use a type conversion operator")
13130 : G_("conversion to a base class "
13131 "will never use a type conversion operator"));
13136 if (operator_code
== COND_EXPR
)
13139 error ("ISO C++ prohibits overloading operator ?:");
13142 else if (ellipsis_p
)
13144 error ("%qD must not have variable number of arguments", decl
);
13147 else if (ambi_op_p (operator_code
))
13150 /* We pick the one-argument operator codes by default, so
13151 we don't have to change anything. */
13153 else if (arity
== 2)
13155 /* If we thought this was a unary operator, we now know
13156 it to be a binary operator. */
13157 switch (operator_code
)
13160 operator_code
= MULT_EXPR
;
13164 operator_code
= BIT_AND_EXPR
;
13167 case UNARY_PLUS_EXPR
:
13168 operator_code
= PLUS_EXPR
;
13172 operator_code
= MINUS_EXPR
;
13175 case PREINCREMENT_EXPR
:
13176 operator_code
= POSTINCREMENT_EXPR
;
13179 case PREDECREMENT_EXPR
:
13180 operator_code
= POSTDECREMENT_EXPR
;
13184 gcc_unreachable ();
13187 SET_OVERLOADED_OPERATOR_CODE (decl
, operator_code
);
13189 if ((operator_code
== POSTINCREMENT_EXPR
13190 || operator_code
== POSTDECREMENT_EXPR
)
13191 && ! processing_template_decl
13192 && ! same_type_p (TREE_VALUE (TREE_CHAIN (argtypes
)), integer_type_node
))
13195 error ("postfix %qD must take %<int%> as its argument",
13198 error ("postfix %qD must take %<int%> as its second "
13206 error ("%qD must take either zero or one argument", decl
);
13208 error ("%qD must take either one or two arguments", decl
);
13212 /* More Effective C++ rule 6. */
13214 && (operator_code
== POSTINCREMENT_EXPR
13215 || operator_code
== POSTDECREMENT_EXPR
13216 || operator_code
== PREINCREMENT_EXPR
13217 || operator_code
== PREDECREMENT_EXPR
))
13219 tree arg
= TREE_VALUE (argtypes
);
13220 tree ret
= TREE_TYPE (TREE_TYPE (decl
));
13221 if (methodp
|| TREE_CODE (arg
) == REFERENCE_TYPE
)
13222 arg
= TREE_TYPE (arg
);
13223 arg
= TYPE_MAIN_VARIANT (arg
);
13224 if (operator_code
== PREINCREMENT_EXPR
13225 || operator_code
== PREDECREMENT_EXPR
)
13227 if (TREE_CODE (ret
) != REFERENCE_TYPE
13228 || !same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (ret
)),
13230 warning (OPT_Weffc__
, "prefix %qD should return %qT", decl
,
13231 build_reference_type (arg
));
13235 if (!same_type_p (TYPE_MAIN_VARIANT (ret
), arg
))
13236 warning (OPT_Weffc__
, "postfix %qD should return %qT", decl
, arg
);
13240 else if (unary_op_p (operator_code
))
13245 error ("%qD must take %<void%>", decl
);
13247 error ("%qD must take exactly one argument", decl
);
13251 else /* if (binary_op_p (operator_code)) */
13256 error ("%qD must take exactly one argument", decl
);
13258 error ("%qD must take exactly two arguments", decl
);
13262 /* More Effective C++ rule 7. */
13264 && (operator_code
== TRUTH_ANDIF_EXPR
13265 || operator_code
== TRUTH_ORIF_EXPR
13266 || operator_code
== COMPOUND_EXPR
))
13267 warning (OPT_Weffc__
, "user-defined %qD always evaluates both arguments",
13271 /* Effective C++ rule 23. */
13274 && !DECL_ASSIGNMENT_OPERATOR_P (decl
)
13275 && (operator_code
== PLUS_EXPR
13276 || operator_code
== MINUS_EXPR
13277 || operator_code
== TRUNC_DIV_EXPR
13278 || operator_code
== MULT_EXPR
13279 || operator_code
== TRUNC_MOD_EXPR
)
13280 && TREE_CODE (TREE_TYPE (TREE_TYPE (decl
))) == REFERENCE_TYPE
)
13281 warning (OPT_Weffc__
, "%qD should return by value", decl
);
13283 /* [over.oper]/8 */
13284 for (; argtypes
&& argtypes
!= void_list_node
;
13285 argtypes
= TREE_CHAIN (argtypes
))
13286 if (TREE_PURPOSE (argtypes
))
13288 TREE_PURPOSE (argtypes
) = NULL_TREE
;
13289 if (operator_code
== POSTINCREMENT_EXPR
13290 || operator_code
== POSTDECREMENT_EXPR
)
13292 pedwarn (input_location
, OPT_Wpedantic
, "%qD cannot have default arguments",
13297 error ("%qD cannot have default arguments", decl
);
13305 /* Return a string giving the keyword associate with CODE. */
13307 static const char *
13308 tag_name (enum tag_types code
)
13320 case typename_type
:
13323 gcc_unreachable ();
13327 /* Name lookup in an elaborated-type-specifier (after the keyword
13328 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
13329 elaborated-type-specifier is invalid, issue a diagnostic and return
13330 error_mark_node; otherwise, return the *_TYPE to which it referred.
13331 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
13334 check_elaborated_type_specifier (enum tag_types tag_code
,
13336 bool allow_template_p
)
13342 struct S { struct S *p; };
13344 name lookup will find the TYPE_DECL for the implicit "S::S"
13345 typedef. Adjust for that here. */
13346 if (DECL_SELF_REFERENCE_P (decl
))
13347 decl
= TYPE_NAME (TREE_TYPE (decl
));
13349 type
= TREE_TYPE (decl
);
13351 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
13352 is false for this case as well. */
13353 if (TREE_CODE (type
) == TEMPLATE_TYPE_PARM
)
13355 error ("using template type parameter %qT after %qs",
13356 type
, tag_name (tag_code
));
13357 return error_mark_node
;
13359 /* Accept template template parameters. */
13360 else if (allow_template_p
13361 && (TREE_CODE (type
) == BOUND_TEMPLATE_TEMPLATE_PARM
13362 || TREE_CODE (type
) == TEMPLATE_TEMPLATE_PARM
))
13366 If the identifier resolves to a typedef-name or the
13367 simple-template-id resolves to an alias template
13368 specialization, the elaborated-type-specifier is ill-formed.
13370 In other words, the only legitimate declaration to use in the
13371 elaborated type specifier is the implicit typedef created when
13372 the type is declared. */
13373 else if (!DECL_IMPLICIT_TYPEDEF_P (decl
)
13374 && !DECL_SELF_REFERENCE_P (decl
)
13375 && tag_code
!= typename_type
)
13377 if (alias_template_specialization_p (type
))
13378 error ("using alias template specialization %qT after %qs",
13379 type
, tag_name (tag_code
));
13381 error ("using typedef-name %qD after %qs", decl
, tag_name (tag_code
));
13382 inform (DECL_SOURCE_LOCATION (decl
),
13383 "%qD has a previous declaration here", decl
);
13384 return error_mark_node
;
13386 else if (TREE_CODE (type
) != RECORD_TYPE
13387 && TREE_CODE (type
) != UNION_TYPE
13388 && tag_code
!= enum_type
13389 && tag_code
!= typename_type
)
13391 error ("%qT referred to as %qs", type
, tag_name (tag_code
));
13392 inform (location_of (type
), "%qT has a previous declaration here", type
);
13393 return error_mark_node
;
13395 else if (TREE_CODE (type
) != ENUMERAL_TYPE
13396 && tag_code
== enum_type
)
13398 error ("%qT referred to as enum", type
);
13399 inform (location_of (type
), "%qT has a previous declaration here", type
);
13400 return error_mark_node
;
13402 else if (!allow_template_p
13403 && TREE_CODE (type
) == RECORD_TYPE
13404 && CLASSTYPE_IS_TEMPLATE (type
))
13406 /* If a class template appears as elaborated type specifier
13407 without a template header such as:
13409 template <class T> class C {};
13410 void f(class C); // No template header here
13412 then the required template argument is missing. */
13413 error ("template argument required for %<%s %T%>",
13414 tag_name (tag_code
),
13415 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type
)));
13416 return error_mark_node
;
13422 /* Lookup NAME in elaborate type specifier in scope according to
13423 SCOPE and issue diagnostics if necessary.
13424 Return *_TYPE node upon success, NULL_TREE when the NAME is not
13425 found, and ERROR_MARK_NODE for type error. */
13428 lookup_and_check_tag (enum tag_types tag_code
, tree name
,
13429 tag_scope scope
, bool template_header_p
)
13433 if (scope
== ts_global
)
13435 /* First try ordinary name lookup, ignoring hidden class name
13436 injected via friend declaration. */
13437 decl
= lookup_name_prefer_type (name
, 2);
13438 decl
= strip_using_decl (decl
);
13439 /* If that fails, the name will be placed in the smallest
13440 non-class, non-function-prototype scope according to 3.3.1/5.
13441 We may already have a hidden name declared as friend in this
13442 scope. So lookup again but not ignoring hidden names.
13443 If we find one, that name will be made visible rather than
13444 creating a new tag. */
13446 decl
= lookup_type_scope (name
, ts_within_enclosing_non_class
);
13449 decl
= lookup_type_scope (name
, scope
);
13452 && (DECL_CLASS_TEMPLATE_P (decl
)
13453 /* If scope is ts_current we're defining a class, so ignore a
13454 template template parameter. */
13455 || (scope
!= ts_current
13456 && DECL_TEMPLATE_TEMPLATE_PARM_P (decl
))))
13457 decl
= DECL_TEMPLATE_RESULT (decl
);
13459 if (decl
&& TREE_CODE (decl
) == TYPE_DECL
)
13461 /* Look for invalid nested type:
13465 if (scope
== ts_current
&& DECL_SELF_REFERENCE_P (decl
))
13467 error ("%qD has the same name as the class in which it is "
13470 return error_mark_node
;
13473 /* Two cases we need to consider when deciding if a class
13474 template is allowed as an elaborated type specifier:
13475 1. It is a self reference to its own class.
13476 2. It comes with a template header.
13480 template <class T> class C {
13481 class C *c1; // DECL_SELF_REFERENCE_P is true
13484 template <class U> class C; // template_header_p is true
13485 template <class T> class C<T>::D {
13486 class C *c2; // DECL_SELF_REFERENCE_P is true
13489 t
= check_elaborated_type_specifier (tag_code
,
13492 | DECL_SELF_REFERENCE_P (decl
));
13493 if (template_header_p
&& t
&& CLASS_TYPE_P (t
)
13494 && (!CLASSTYPE_TEMPLATE_INFO (t
)
13495 || (!PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (t
)))))
13497 error ("%qT is not a template", t
);
13498 inform (location_of (t
), "previous declaration here");
13499 if (TYPE_CLASS_SCOPE_P (t
)
13500 && CLASSTYPE_TEMPLATE_INFO (TYPE_CONTEXT (t
)))
13501 inform (input_location
,
13502 "perhaps you want to explicitly add %<%T::%>",
13504 t
= error_mark_node
;
13509 else if (decl
&& TREE_CODE (decl
) == TREE_LIST
)
13511 error ("reference to %qD is ambiguous", name
);
13512 print_candidates (decl
);
13513 return error_mark_node
;
13519 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
13520 Define the tag as a forward-reference if it is not defined.
13522 If a declaration is given, process it here, and report an error if
13523 multiple declarations are not identical.
13525 SCOPE is TS_CURRENT when this is also a definition. Only look in
13526 the current frame for the name (since C++ allows new names in any
13527 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
13528 declaration. Only look beginning from the current scope outward up
13529 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
13531 TEMPLATE_HEADER_P is true when this declaration is preceded by
13532 a set of template parameters. */
13535 xref_tag_1 (enum tag_types tag_code
, tree name
,
13536 tag_scope orig_scope
, bool template_header_p
)
13538 enum tree_code code
;
13540 tree context
= NULL_TREE
;
13543 gcc_assert (identifier_p (name
));
13549 code
= RECORD_TYPE
;
13555 code
= ENUMERAL_TYPE
;
13558 gcc_unreachable ();
13561 if (orig_scope
== ts_lambda
)
13562 scope
= ts_current
;
13564 scope
= orig_scope
;
13566 /* In case of anonymous name, xref_tag is only called to
13567 make type node and push name. Name lookup is not required. */
13568 if (anon_aggrname_p (name
))
13571 t
= lookup_and_check_tag (tag_code
, name
,
13572 scope
, template_header_p
);
13574 if (t
== error_mark_node
)
13575 return error_mark_node
;
13577 if (scope
!= ts_current
&& t
&& current_class_type
13578 && template_class_depth (current_class_type
)
13579 && template_header_p
)
13581 if (TREE_CODE (t
) == TEMPLATE_TEMPLATE_PARM
)
13584 /* Since SCOPE is not TS_CURRENT, we are not looking at a
13585 definition of this tag. Since, in addition, we are currently
13586 processing a (member) template declaration of a template
13587 class, we must be very careful; consider:
13594 { template <class V>
13595 friend struct S1; };
13597 Here, the S2::S1 declaration should not be confused with the
13598 outer declaration. In particular, the inner version should
13599 have a template parameter of level 2, not level 1. This
13600 would be particularly important if the member declaration
13603 template <class V = U> friend struct S1;
13605 say, when we should tsubst into `U' when instantiating
13606 S2. On the other hand, when presented with:
13616 we must find the inner binding eventually. We
13617 accomplish this by making sure that the new type we
13618 create to represent this declaration has the right
13620 context
= TYPE_CONTEXT (t
);
13626 /* If no such tag is yet defined, create a forward-reference node
13627 and record it as the "definition".
13628 When a real declaration of this type is found,
13629 the forward-reference will be altered into a real type. */
13630 if (code
== ENUMERAL_TYPE
)
13632 error ("use of enum %q#D without previous declaration", name
);
13633 return error_mark_node
;
13637 t
= make_class_type (code
);
13638 TYPE_CONTEXT (t
) = context
;
13639 if (orig_scope
== ts_lambda
)
13640 /* Remember that we're declaring a lambda to avoid bogus errors
13641 in push_template_decl. */
13642 CLASSTYPE_LAMBDA_EXPR (t
) = error_mark_node
;
13643 t
= pushtag (name
, t
, scope
);
13648 if (template_header_p
&& MAYBE_CLASS_TYPE_P (t
))
13650 /* Check that we aren't trying to overload a class with different
13652 tree constr
= NULL_TREE
;
13653 if (current_template_parms
)
13655 tree reqs
= TEMPLATE_PARMS_CONSTRAINTS (current_template_parms
);
13656 constr
= build_constraints (reqs
, NULL_TREE
);
13658 if (!redeclare_class_template (t
, current_template_parms
, constr
))
13659 return error_mark_node
;
13661 else if (!processing_template_decl
13662 && CLASS_TYPE_P (t
)
13663 && CLASSTYPE_IS_TEMPLATE (t
))
13665 error ("redeclaration of %qT as a non-template", t
);
13666 inform (location_of (t
), "previous declaration %qD", t
);
13667 return error_mark_node
;
13670 /* Make injected friend class visible. */
13671 if (scope
!= ts_within_enclosing_non_class
13672 && hidden_name_p (TYPE_NAME (t
)))
13674 DECL_ANTICIPATED (TYPE_NAME (t
)) = 0;
13675 DECL_FRIEND_P (TYPE_NAME (t
)) = 0;
13677 if (TYPE_TEMPLATE_INFO (t
))
13679 DECL_ANTICIPATED (TYPE_TI_TEMPLATE (t
)) = 0;
13680 DECL_FRIEND_P (TYPE_TI_TEMPLATE (t
)) = 0;
13688 /* Wrapper for xref_tag_1. */
13691 xref_tag (enum tag_types tag_code
, tree name
,
13692 tag_scope scope
, bool template_header_p
)
13696 subtime
= timevar_cond_start (TV_NAME_LOOKUP
);
13697 ret
= xref_tag_1 (tag_code
, name
, scope
, template_header_p
);
13698 timevar_cond_stop (TV_NAME_LOOKUP
, subtime
);
13704 xref_tag_from_type (tree old
, tree id
, tag_scope scope
)
13706 enum tag_types tag_kind
;
13708 if (TREE_CODE (old
) == RECORD_TYPE
)
13709 tag_kind
= (CLASSTYPE_DECLARED_CLASS (old
) ? class_type
: record_type
);
13711 tag_kind
= union_type
;
13713 if (id
== NULL_TREE
)
13714 id
= TYPE_IDENTIFIER (old
);
13716 return xref_tag (tag_kind
, id
, scope
, false);
13719 /* Create the binfo hierarchy for REF with (possibly NULL) base list
13720 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
13721 access_* node, and the TREE_VALUE is the type of the base-class.
13722 Non-NULL TREE_TYPE indicates virtual inheritance. */
13725 xref_basetypes (tree ref
, tree base_list
)
13728 tree binfo
, base_binfo
;
13729 unsigned max_vbases
= 0; /* Maximum direct & indirect virtual bases. */
13730 unsigned max_bases
= 0; /* Maximum direct bases. */
13731 unsigned max_dvbases
= 0; /* Maximum direct virtual bases. */
13733 tree default_access
;
13734 tree igo_prev
; /* Track Inheritance Graph Order. */
13736 if (ref
== error_mark_node
)
13739 /* The base of a derived class is private by default, all others are
13741 default_access
= (TREE_CODE (ref
) == RECORD_TYPE
13742 && CLASSTYPE_DECLARED_CLASS (ref
)
13743 ? access_private_node
: access_public_node
);
13745 /* First, make sure that any templates in base-classes are
13746 instantiated. This ensures that if we call ourselves recursively
13747 we do not get confused about which classes are marked and which
13749 basep
= &base_list
;
13752 tree basetype
= TREE_VALUE (*basep
);
13754 /* The dependent_type_p call below should really be dependent_scope_p
13755 so that we give a hard error about using an incomplete type as a
13756 base, but we allow it with a pedwarn for backward
13758 if (processing_template_decl
13759 && CLASS_TYPE_P (basetype
) && TYPE_BEING_DEFINED (basetype
))
13760 cxx_incomplete_type_diagnostic (NULL_TREE
, basetype
, DK_PEDWARN
);
13761 if (!dependent_type_p (basetype
)
13762 && !complete_type_or_else (basetype
, NULL
))
13763 /* An incomplete type. Remove it from the list. */
13764 *basep
= TREE_CHAIN (*basep
);
13768 if (TREE_TYPE (*basep
))
13770 if (CLASS_TYPE_P (basetype
))
13771 max_vbases
+= vec_safe_length (CLASSTYPE_VBASECLASSES (basetype
));
13772 basep
= &TREE_CHAIN (*basep
);
13775 max_vbases
+= max_dvbases
;
13777 TYPE_MARKED_P (ref
) = 1;
13779 /* The binfo slot should be empty, unless this is an (ill-formed)
13781 gcc_assert (!TYPE_BINFO (ref
) || TYPE_SIZE (ref
));
13783 gcc_assert (TYPE_MAIN_VARIANT (ref
) == ref
);
13785 binfo
= make_tree_binfo (max_bases
);
13787 TYPE_BINFO (ref
) = binfo
;
13788 BINFO_OFFSET (binfo
) = size_zero_node
;
13789 BINFO_TYPE (binfo
) = ref
;
13791 /* Apply base-class info set up to the variants of this type. */
13792 fixup_type_variants (ref
);
13796 vec_alloc (BINFO_BASE_ACCESSES (binfo
), max_bases
);
13797 /* A C++98 POD cannot have base classes. */
13798 CLASSTYPE_NON_LAYOUT_POD_P (ref
) = true;
13800 if (TREE_CODE (ref
) == UNION_TYPE
)
13801 error ("derived union %qT invalid", ref
);
13805 warning (OPT_Wmultiple_inheritance
,
13806 "%qT defined with multiple direct bases", ref
);
13810 vec_alloc (CLASSTYPE_VBASECLASSES (ref
), max_vbases
);
13813 warning (OPT_Wvirtual_inheritance
,
13814 "%qT defined with direct virtual base", ref
);
13817 for (igo_prev
= binfo
; base_list
; base_list
= TREE_CHAIN (base_list
))
13819 tree access
= TREE_PURPOSE (base_list
);
13820 int via_virtual
= TREE_TYPE (base_list
) != NULL_TREE
;
13821 tree basetype
= TREE_VALUE (base_list
);
13823 if (access
== access_default_node
)
13824 access
= default_access
;
13826 /* Before C++17, an aggregate cannot have base classes. In C++17, an
13827 aggregate can't have virtual, private, or protected base classes. */
13828 if (cxx_dialect
< cxx1z
13829 || access
!= access_public_node
13831 CLASSTYPE_NON_AGGREGATE (ref
) = true;
13833 if (PACK_EXPANSION_P (basetype
))
13834 basetype
= PACK_EXPANSION_PATTERN (basetype
);
13835 if (TREE_CODE (basetype
) == TYPE_DECL
)
13836 basetype
= TREE_TYPE (basetype
);
13837 if (!MAYBE_CLASS_TYPE_P (basetype
) || TREE_CODE (basetype
) == UNION_TYPE
)
13839 error ("base type %qT fails to be a struct or class type",
13844 base_binfo
= NULL_TREE
;
13845 if (CLASS_TYPE_P (basetype
) && !dependent_scope_p (basetype
))
13847 base_binfo
= TYPE_BINFO (basetype
);
13848 /* The original basetype could have been a typedef'd type. */
13849 basetype
= BINFO_TYPE (base_binfo
);
13851 /* Inherit flags from the base. */
13852 TYPE_HAS_NEW_OPERATOR (ref
)
13853 |= TYPE_HAS_NEW_OPERATOR (basetype
);
13854 TYPE_HAS_ARRAY_NEW_OPERATOR (ref
)
13855 |= TYPE_HAS_ARRAY_NEW_OPERATOR (basetype
);
13856 TYPE_GETS_DELETE (ref
) |= TYPE_GETS_DELETE (basetype
);
13857 TYPE_HAS_CONVERSION (ref
) |= TYPE_HAS_CONVERSION (basetype
);
13858 CLASSTYPE_DIAMOND_SHAPED_P (ref
)
13859 |= CLASSTYPE_DIAMOND_SHAPED_P (basetype
);
13860 CLASSTYPE_REPEATED_BASE_P (ref
)
13861 |= CLASSTYPE_REPEATED_BASE_P (basetype
);
13864 /* We must do this test after we've seen through a typedef
13866 if (TYPE_MARKED_P (basetype
))
13868 if (basetype
== ref
)
13869 error ("recursive type %qT undefined", basetype
);
13871 error ("duplicate base type %qT invalid", basetype
);
13875 if (PACK_EXPANSION_P (TREE_VALUE (base_list
)))
13876 /* Regenerate the pack expansion for the bases. */
13877 basetype
= make_pack_expansion (basetype
);
13879 TYPE_MARKED_P (basetype
) = 1;
13881 base_binfo
= copy_binfo (base_binfo
, basetype
, ref
,
13882 &igo_prev
, via_virtual
);
13883 if (!BINFO_INHERITANCE_CHAIN (base_binfo
))
13884 BINFO_INHERITANCE_CHAIN (base_binfo
) = binfo
;
13886 BINFO_BASE_APPEND (binfo
, base_binfo
);
13887 BINFO_BASE_ACCESS_APPEND (binfo
, access
);
13891 /* Update max_vbases to reflect the reality that we are dropping
13892 this base: if it reaches zero we want to undo the vec_alloc
13893 above to avoid inconsistencies during error-recovery: eg, in
13894 build_special_member_call, CLASSTYPE_VBASECLASSES non null
13895 and vtt null (c++/27952). */
13898 if (CLASS_TYPE_P (basetype
))
13900 -= vec_safe_length (CLASSTYPE_VBASECLASSES (basetype
));
13903 if (CLASSTYPE_VBASECLASSES (ref
)
13904 && max_vbases
== 0)
13905 vec_free (CLASSTYPE_VBASECLASSES (ref
));
13907 if (vec_safe_length (CLASSTYPE_VBASECLASSES (ref
)) < max_vbases
)
13908 /* If we didn't get max_vbases vbases, we must have shared at
13909 least one of them, and are therefore diamond shaped. */
13910 CLASSTYPE_DIAMOND_SHAPED_P (ref
) = 1;
13912 /* Unmark all the types. */
13913 for (i
= 0; BINFO_BASE_ITERATE (binfo
, i
, base_binfo
); i
++)
13914 TYPE_MARKED_P (BINFO_TYPE (base_binfo
)) = 0;
13915 TYPE_MARKED_P (ref
) = 0;
13917 /* Now see if we have a repeated base type. */
13918 if (!CLASSTYPE_REPEATED_BASE_P (ref
))
13920 for (base_binfo
= binfo
; base_binfo
;
13921 base_binfo
= TREE_CHAIN (base_binfo
))
13923 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo
)))
13925 CLASSTYPE_REPEATED_BASE_P (ref
) = 1;
13928 TYPE_MARKED_P (BINFO_TYPE (base_binfo
)) = 1;
13930 for (base_binfo
= binfo
; base_binfo
;
13931 base_binfo
= TREE_CHAIN (base_binfo
))
13932 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo
)))
13933 TYPE_MARKED_P (BINFO_TYPE (base_binfo
)) = 0;
13940 /* Copies the enum-related properties from type SRC to type DST.
13941 Used with the underlying type of an enum and the enum itself. */
13943 copy_type_enum (tree dst
, tree src
)
13946 for (t
= dst
; t
; t
= TYPE_NEXT_VARIANT (t
))
13948 TYPE_MIN_VALUE (t
) = TYPE_MIN_VALUE (src
);
13949 TYPE_MAX_VALUE (t
) = TYPE_MAX_VALUE (src
);
13950 TYPE_SIZE (t
) = TYPE_SIZE (src
);
13951 TYPE_SIZE_UNIT (t
) = TYPE_SIZE_UNIT (src
);
13952 SET_TYPE_MODE (dst
, TYPE_MODE (src
));
13953 TYPE_PRECISION (t
) = TYPE_PRECISION (src
);
13954 unsigned valign
= TYPE_ALIGN (src
);
13955 if (TYPE_USER_ALIGN (t
))
13956 valign
= MAX (valign
, TYPE_ALIGN (t
));
13958 TYPE_USER_ALIGN (t
) = TYPE_USER_ALIGN (src
);
13959 SET_TYPE_ALIGN (t
, valign
);
13960 TYPE_UNSIGNED (t
) = TYPE_UNSIGNED (src
);
13964 /* Begin compiling the definition of an enumeration type.
13967 if ENUMTYPE is not NULL_TREE then the type has alredy been found.
13969 UNDERLYING_TYPE is the type that will be used as the storage for
13970 the enumeration type. This should be NULL_TREE if no storage type
13973 ATTRIBUTES are any attributes specified after the enum-key.
13975 SCOPED_ENUM_P is true if this is a scoped enumeration type.
13977 if IS_NEW is not NULL, gets TRUE iff a new type is created.
13979 Returns the type object, as yet incomplete.
13980 Also records info about it so that build_enumerator
13981 may be used to declare the individual values as they are read. */
13984 start_enum (tree name
, tree enumtype
, tree underlying_type
,
13985 tree attributes
, bool scoped_enum_p
, bool *is_new
)
13987 tree prevtype
= NULL_TREE
;
13988 gcc_assert (identifier_p (name
));
13992 /* [C++0x dcl.enum]p5:
13994 If not explicitly specified, the underlying type of a scoped
13995 enumeration type is int. */
13996 if (!underlying_type
&& scoped_enum_p
)
13997 underlying_type
= integer_type_node
;
13999 if (underlying_type
)
14000 underlying_type
= cv_unqualified (underlying_type
);
14002 /* If this is the real definition for a previous forward reference,
14003 fill in the contents in the same object that used to be the
14004 forward reference. */
14006 enumtype
= lookup_and_check_tag (enum_type
, name
,
14007 /*tag_scope=*/ts_current
,
14008 /*template_header_p=*/false);
14010 /* In case of a template_decl, the only check that should be deferred
14011 to instantiation time is the comparison of underlying types. */
14012 if (enumtype
&& TREE_CODE (enumtype
) == ENUMERAL_TYPE
)
14014 if (scoped_enum_p
!= SCOPED_ENUM_P (enumtype
))
14016 error_at (input_location
, "scoped/unscoped mismatch "
14017 "in enum %q#T", enumtype
);
14018 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype
)),
14019 "previous definition here");
14020 enumtype
= error_mark_node
;
14022 else if (ENUM_FIXED_UNDERLYING_TYPE_P (enumtype
) != !! underlying_type
)
14024 error_at (input_location
, "underlying type mismatch "
14025 "in enum %q#T", enumtype
);
14026 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype
)),
14027 "previous definition here");
14028 enumtype
= error_mark_node
;
14030 else if (underlying_type
&& ENUM_UNDERLYING_TYPE (enumtype
)
14031 && !dependent_type_p (underlying_type
)
14032 && !dependent_type_p (ENUM_UNDERLYING_TYPE (enumtype
))
14033 && !same_type_p (underlying_type
,
14034 ENUM_UNDERLYING_TYPE (enumtype
)))
14036 error_at (input_location
, "different underlying type "
14037 "in enum %q#T", enumtype
);
14038 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype
)),
14039 "previous definition here");
14040 underlying_type
= NULL_TREE
;
14044 if (!enumtype
|| TREE_CODE (enumtype
) != ENUMERAL_TYPE
14045 || processing_template_decl
)
14047 /* In case of error, make a dummy enum to allow parsing to
14049 if (enumtype
== error_mark_node
)
14051 name
= make_anon_name ();
14052 enumtype
= NULL_TREE
;
14055 /* enumtype may be an ENUMERAL_TYPE if this is a redefinition
14056 of an opaque enum, or an opaque enum of an already defined
14057 enumeration (C++0x only).
14058 In any other case, it'll be NULL_TREE. */
14064 prevtype
= enumtype
;
14066 /* Do not push the decl more than once, unless we need to
14067 compare underlying types at instantiation time */
14069 || TREE_CODE (enumtype
) != ENUMERAL_TYPE
14070 || (underlying_type
14071 && dependent_type_p (underlying_type
))
14072 || (ENUM_UNDERLYING_TYPE (enumtype
)
14073 && dependent_type_p (ENUM_UNDERLYING_TYPE (enumtype
))))
14075 enumtype
= cxx_make_type (ENUMERAL_TYPE
);
14076 enumtype
= pushtag (name
, enumtype
, /*tag_scope=*/ts_current
);
14079 enumtype
= xref_tag (enum_type
, name
, /*tag_scope=*/ts_current
,
14082 if (enumtype
== error_mark_node
)
14083 return error_mark_node
;
14085 /* The enum is considered opaque until the opening '{' of the
14086 enumerator list. */
14087 SET_OPAQUE_ENUM_P (enumtype
, true);
14088 ENUM_FIXED_UNDERLYING_TYPE_P (enumtype
) = !! underlying_type
;
14091 SET_SCOPED_ENUM_P (enumtype
, scoped_enum_p
);
14093 cplus_decl_attributes (&enumtype
, attributes
, (int)ATTR_FLAG_TYPE_IN_PLACE
);
14095 if (underlying_type
)
14097 if (ENUM_UNDERLYING_TYPE (enumtype
))
14098 /* We already checked that it matches, don't change it to a different
14099 typedef variant. */;
14100 else if (CP_INTEGRAL_TYPE_P (underlying_type
))
14102 copy_type_enum (enumtype
, underlying_type
);
14103 ENUM_UNDERLYING_TYPE (enumtype
) = underlying_type
;
14105 else if (dependent_type_p (underlying_type
))
14106 ENUM_UNDERLYING_TYPE (enumtype
) = underlying_type
;
14108 error ("underlying type %<%T%> of %<%T%> must be an integral type",
14109 underlying_type
, enumtype
);
14112 /* If into a template class, the returned enum is always the first
14113 declaration (opaque or not) seen. This way all the references to
14114 this type will be to the same declaration. The following ones are used
14115 only to check for definition errors. */
14116 if (prevtype
&& processing_template_decl
)
14122 /* After processing and defining all the values of an enumeration type,
14123 install their decls in the enumeration type.
14124 ENUMTYPE is the type object. */
14127 finish_enum_value_list (tree enumtype
)
14130 tree underlying_type
;
14133 tree minnode
, maxnode
;
14136 bool fixed_underlying_type_p
14137 = ENUM_UNDERLYING_TYPE (enumtype
) != NULL_TREE
;
14139 /* We built up the VALUES in reverse order. */
14140 TYPE_VALUES (enumtype
) = nreverse (TYPE_VALUES (enumtype
));
14142 /* For an enum defined in a template, just set the type of the values;
14143 all further processing is postponed until the template is
14144 instantiated. We need to set the type so that tsubst of a CONST_DECL
14146 if (processing_template_decl
)
14148 for (values
= TYPE_VALUES (enumtype
);
14150 values
= TREE_CHAIN (values
))
14151 TREE_TYPE (TREE_VALUE (values
)) = enumtype
;
14155 /* Determine the minimum and maximum values of the enumerators. */
14156 if (TYPE_VALUES (enumtype
))
14158 minnode
= maxnode
= NULL_TREE
;
14160 for (values
= TYPE_VALUES (enumtype
);
14162 values
= TREE_CHAIN (values
))
14164 decl
= TREE_VALUE (values
);
14166 /* [dcl.enum]: Following the closing brace of an enum-specifier,
14167 each enumerator has the type of its enumeration. Prior to the
14168 closing brace, the type of each enumerator is the type of its
14169 initializing value. */
14170 TREE_TYPE (decl
) = enumtype
;
14172 /* Update the minimum and maximum values, if appropriate. */
14173 value
= DECL_INITIAL (decl
);
14174 if (value
== error_mark_node
)
14175 value
= integer_zero_node
;
14176 /* Figure out what the minimum and maximum values of the
14177 enumerators are. */
14179 minnode
= maxnode
= value
;
14180 else if (tree_int_cst_lt (maxnode
, value
))
14182 else if (tree_int_cst_lt (value
, minnode
))
14189 If the enumerator-list is empty, the underlying type is as if
14190 the enumeration had a single enumerator with value 0. */
14191 minnode
= maxnode
= integer_zero_node
;
14193 if (!fixed_underlying_type_p
)
14195 /* Compute the number of bits require to represent all values of the
14196 enumeration. We must do this before the type of MINNODE and
14197 MAXNODE are transformed, since tree_int_cst_min_precision relies
14198 on the TREE_TYPE of the value it is passed. */
14199 signop sgn
= tree_int_cst_sgn (minnode
) >= 0 ? UNSIGNED
: SIGNED
;
14200 int lowprec
= tree_int_cst_min_precision (minnode
, sgn
);
14201 int highprec
= tree_int_cst_min_precision (maxnode
, sgn
);
14202 int precision
= MAX (lowprec
, highprec
);
14204 bool use_short_enum
;
14206 /* Determine the underlying type of the enumeration.
14210 The underlying type of an enumeration is an integral type that
14211 can represent all the enumerator values defined in the
14212 enumeration. It is implementation-defined which integral type is
14213 used as the underlying type for an enumeration except that the
14214 underlying type shall not be larger than int unless the value of
14215 an enumerator cannot fit in an int or unsigned int.
14217 We use "int" or an "unsigned int" as the underlying type, even if
14218 a smaller integral type would work, unless the user has
14219 explicitly requested that we use the smallest possible type. The
14220 user can request that for all enumerations with a command line
14221 flag, or for just one enumeration with an attribute. */
14223 use_short_enum
= flag_short_enums
14224 || lookup_attribute ("packed", TYPE_ATTRIBUTES (enumtype
));
14226 /* If the precision of the type was specified with an attribute and it
14227 was too small, give an error. Otherwise, use it. */
14228 if (TYPE_PRECISION (enumtype
))
14230 if (precision
> TYPE_PRECISION (enumtype
))
14231 error ("specified mode too small for enumeral values");
14234 use_short_enum
= true;
14235 precision
= TYPE_PRECISION (enumtype
);
14239 for (itk
= (use_short_enum
? itk_char
: itk_int
);
14243 underlying_type
= integer_types
[itk
];
14244 if (underlying_type
!= NULL_TREE
14245 && TYPE_PRECISION (underlying_type
) >= precision
14246 && TYPE_SIGN (underlying_type
) == sgn
)
14249 if (itk
== itk_none
)
14253 IF no integral type can represent all the enumerator values, the
14254 enumeration is ill-formed. */
14255 error ("no integral type can represent all of the enumerator values "
14256 "for %qT", enumtype
);
14257 precision
= TYPE_PRECISION (long_long_integer_type_node
);
14258 underlying_type
= integer_types
[itk_unsigned_long_long
];
14263 The value of sizeof() applied to an enumeration type, an object
14264 of an enumeration type, or an enumerator, is the value of sizeof()
14265 applied to the underlying type. */
14266 copy_type_enum (enumtype
, underlying_type
);
14268 /* Compute the minimum and maximum values for the type.
14272 For an enumeration where emin is the smallest enumerator and emax
14273 is the largest, the values of the enumeration are the values of the
14274 underlying type in the range bmin to bmax, where bmin and bmax are,
14275 respectively, the smallest and largest values of the smallest bit-
14276 field that can store emin and emax. */
14278 /* The middle-end currently assumes that types with TYPE_PRECISION
14279 narrower than their underlying type are suitably zero or sign
14280 extended to fill their mode. Similarly, it assumes that the front
14281 end assures that a value of a particular type must be within
14282 TYPE_MIN_VALUE and TYPE_MAX_VALUE.
14284 We used to set these fields based on bmin and bmax, but that led
14285 to invalid assumptions like optimizing away bounds checking. So
14286 now we just set the TYPE_PRECISION, TYPE_MIN_VALUE, and
14287 TYPE_MAX_VALUE to the values for the mode above and only restrict
14288 the ENUM_UNDERLYING_TYPE for the benefit of diagnostics. */
14289 ENUM_UNDERLYING_TYPE (enumtype
)
14290 = build_distinct_type_copy (underlying_type
);
14291 TYPE_PRECISION (ENUM_UNDERLYING_TYPE (enumtype
)) = precision
;
14292 set_min_and_max_values_for_integral_type
14293 (ENUM_UNDERLYING_TYPE (enumtype
), precision
, sgn
);
14295 /* If -fstrict-enums, still constrain TYPE_MIN/MAX_VALUE. */
14296 if (flag_strict_enums
)
14297 set_min_and_max_values_for_integral_type (enumtype
, precision
, sgn
);
14300 underlying_type
= ENUM_UNDERLYING_TYPE (enumtype
);
14302 /* Convert each of the enumerators to the type of the underlying
14303 type of the enumeration. */
14304 for (values
= TYPE_VALUES (enumtype
); values
; values
= TREE_CHAIN (values
))
14306 location_t saved_location
;
14308 decl
= TREE_VALUE (values
);
14309 saved_location
= input_location
;
14310 input_location
= DECL_SOURCE_LOCATION (decl
);
14311 if (fixed_underlying_type_p
)
14312 /* If the enumeration type has a fixed underlying type, we
14313 already checked all of the enumerator values. */
14314 value
= DECL_INITIAL (decl
);
14316 value
= perform_implicit_conversion (underlying_type
,
14317 DECL_INITIAL (decl
),
14318 tf_warning_or_error
);
14319 input_location
= saved_location
;
14321 /* Do not clobber shared ints. */
14322 value
= copy_node (value
);
14324 TREE_TYPE (value
) = enumtype
;
14325 DECL_INITIAL (decl
) = value
;
14328 /* Fix up all variant types of this enum type. */
14329 for (t
= TYPE_MAIN_VARIANT (enumtype
); t
; t
= TYPE_NEXT_VARIANT (t
))
14330 TYPE_VALUES (t
) = TYPE_VALUES (enumtype
);
14332 if (at_class_scope_p ()
14333 && COMPLETE_TYPE_P (current_class_type
)
14334 && UNSCOPED_ENUM_P (enumtype
))
14336 insert_late_enum_def_into_classtype_sorted_fields (enumtype
,
14337 current_class_type
);
14338 fixup_type_variants (current_class_type
);
14341 /* Finish debugging output for this type. */
14342 rest_of_type_compilation (enumtype
, namespace_bindings_p ());
14344 /* Each enumerator now has the type of its enumeration. Clear the cache
14345 so that this change in types doesn't confuse us later on. */
14346 clear_cv_and_fold_caches ();
14349 /* Finishes the enum type. This is called only the first time an
14350 enumeration is seen, be it opaque or odinary.
14351 ENUMTYPE is the type object. */
14354 finish_enum (tree enumtype
)
14356 if (processing_template_decl
)
14358 if (at_function_scope_p ())
14359 add_stmt (build_min (TAG_DEFN
, enumtype
));
14363 /* If this is a forward declaration, there should not be any variants,
14364 though we can get a variant in the middle of an enum-specifier with
14365 wacky code like 'enum E { e = sizeof(const E*) };' */
14366 gcc_assert (enumtype
== TYPE_MAIN_VARIANT (enumtype
)
14367 && (TYPE_VALUES (enumtype
)
14368 || !TYPE_NEXT_VARIANT (enumtype
)));
14371 /* Build and install a CONST_DECL for an enumeration constant of the
14372 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
14373 Apply ATTRIBUTES if available. LOC is the location of NAME.
14374 Assignment of sequential values by default is handled here. */
14377 build_enumerator (tree name
, tree value
, tree enumtype
, tree attributes
,
14384 /* scalar_constant_value will pull out this expression, so make sure
14385 it's folded as appropriate. */
14386 if (processing_template_decl
)
14387 value
= fold_non_dependent_expr (value
);
14389 /* If the VALUE was erroneous, pretend it wasn't there; that will
14390 result in the enum being assigned the next value in sequence. */
14391 if (value
== error_mark_node
)
14394 /* Remove no-op casts from the value. */
14396 STRIP_TYPE_NOPS (value
);
14398 if (! processing_template_decl
)
14400 /* Validate and default VALUE. */
14401 if (value
!= NULL_TREE
)
14403 if (!ENUM_UNDERLYING_TYPE (enumtype
))
14405 tree tmp_value
= build_expr_type_conversion (WANT_INT
| WANT_ENUM
,
14410 else if (! INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P
14411 (TREE_TYPE (value
)))
14412 value
= perform_implicit_conversion_flags
14413 (ENUM_UNDERLYING_TYPE (enumtype
), value
, tf_warning_or_error
,
14414 LOOKUP_IMPLICIT
| LOOKUP_NO_NARROWING
);
14416 if (value
== error_mark_node
)
14419 if (value
!= NULL_TREE
)
14421 if (! INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P
14422 (TREE_TYPE (value
)))
14424 error ("enumerator value for %qD must have integral or "
14425 "unscoped enumeration type", name
);
14430 value
= cxx_constant_value (value
);
14432 if (TREE_CODE (value
) != INTEGER_CST
)
14434 error ("enumerator value for %qD is not an integer "
14442 /* Default based on previous value. */
14443 if (value
== NULL_TREE
)
14445 if (TYPE_VALUES (enumtype
))
14450 /* C++03 7.2/4: If no initializer is specified for the first
14451 enumerator, the type is an unspecified integral
14452 type. Otherwise the type is the same as the type of the
14453 initializing value of the preceding enumerator unless the
14454 incremented value is not representable in that type, in
14455 which case the type is an unspecified integral type
14456 sufficient to contain the incremented value. */
14457 prev_value
= DECL_INITIAL (TREE_VALUE (TYPE_VALUES (enumtype
)));
14458 if (error_operand_p (prev_value
))
14459 value
= error_mark_node
;
14462 tree type
= TREE_TYPE (prev_value
);
14463 signop sgn
= TYPE_SIGN (type
);
14464 widest_int wi
= wi::add (wi::to_widest (prev_value
), 1, sgn
,
14468 bool pos
= !wi::neg_p (wi
, sgn
);
14469 if (!wi::fits_to_tree_p (wi
, type
))
14472 for (itk
= itk_int
; itk
!= itk_none
; itk
++)
14474 type
= integer_types
[itk
];
14475 if (type
!= NULL_TREE
14476 && (pos
|| !TYPE_UNSIGNED (type
))
14477 && wi::fits_to_tree_p (wi
, type
))
14480 if (type
&& cxx_dialect
< cxx11
14481 && itk
> itk_unsigned_long
)
14482 pedwarn (input_location
, OPT_Wlong_long
, pos
? "\
14483 incremented enumerator value is too large for %<unsigned long%>" : "\
14484 incremented enumerator value is too large for %<long%>");
14486 if (type
== NULL_TREE
)
14489 value
= wide_int_to_tree (type
, wi
);
14494 error ("overflow in enumeration values at %qD", name
);
14495 value
= error_mark_node
;
14500 value
= integer_zero_node
;
14503 /* Remove no-op casts from the value. */
14504 STRIP_TYPE_NOPS (value
);
14506 /* If the underlying type of the enum is fixed, check whether
14507 the enumerator values fits in the underlying type. If it
14508 does not fit, the program is ill-formed [C++0x dcl.enum]. */
14509 if (ENUM_UNDERLYING_TYPE (enumtype
)
14511 && TREE_CODE (value
) == INTEGER_CST
)
14513 if (!int_fits_type_p (value
, ENUM_UNDERLYING_TYPE (enumtype
)))
14514 error ("enumerator value %E is outside the range of underlying "
14515 "type %<%T%>", value
, ENUM_UNDERLYING_TYPE (enumtype
));
14517 /* Convert the value to the appropriate type. */
14518 value
= fold_convert (ENUM_UNDERLYING_TYPE (enumtype
), value
);
14522 /* C++ associates enums with global, function, or class declarations. */
14523 context
= current_scope ();
14525 /* Build the actual enumeration constant. Note that the enumeration
14526 constants have the underlying type of the enum (if it is fixed)
14527 or the type of their initializer (if the underlying type of the
14528 enum is not fixed):
14532 If the underlying type is fixed, the type of each enumerator
14533 prior to the closing brace is the underlying type; if the
14534 initializing value of an enumerator cannot be represented by
14535 the underlying type, the program is ill-formed. If the
14536 underlying type is not fixed, the type of each enumerator is
14537 the type of its initializing value.
14539 If the underlying type is not fixed, it will be computed by
14540 finish_enum and we will reset the type of this enumerator. Of
14541 course, if we're processing a template, there may be no value. */
14542 type
= value
? TREE_TYPE (value
) : NULL_TREE
;
14544 decl
= build_decl (loc
, CONST_DECL
, name
, type
);
14546 DECL_CONTEXT (decl
) = enumtype
;
14547 TREE_CONSTANT (decl
) = 1;
14548 TREE_READONLY (decl
) = 1;
14549 DECL_INITIAL (decl
) = value
;
14552 cplus_decl_attributes (&decl
, attributes
, 0);
14554 if (context
&& context
== current_class_type
&& !SCOPED_ENUM_P (enumtype
))
14556 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
14557 on the TYPE_FIELDS list for `S'. (That's so that you can say
14558 things like `S::i' later.) */
14560 /* The enumerator may be getting declared outside of its enclosing
14563 class S { public: enum E : int; }; enum S::E : int { i = 7; };
14565 For which case we need to make sure that the access of `S::i'
14566 matches the access of `S::E'. */
14567 tree saved_cas
= current_access_specifier
;
14568 if (TREE_PRIVATE (TYPE_NAME (enumtype
)))
14569 current_access_specifier
= access_private_node
;
14570 else if (TREE_PROTECTED (TYPE_NAME (enumtype
)))
14571 current_access_specifier
= access_protected_node
;
14573 current_access_specifier
= access_public_node
;
14575 finish_member_declaration (decl
);
14577 current_access_specifier
= saved_cas
;
14582 /* Add this enumeration constant to the list for this type. */
14583 TYPE_VALUES (enumtype
) = tree_cons (name
, decl
, TYPE_VALUES (enumtype
));
14586 /* Look for an enumerator with the given NAME within the enumeration
14587 type ENUMTYPE. This routine is used primarily for qualified name
14588 lookup into an enumerator in C++0x, e.g.,
14590 enum class Color { Red, Green, Blue };
14592 Color color = Color::Red;
14594 Returns the value corresponding to the enumerator, or
14595 NULL_TREE if no such enumerator was found. */
14597 lookup_enumerator (tree enumtype
, tree name
)
14600 gcc_assert (enumtype
&& TREE_CODE (enumtype
) == ENUMERAL_TYPE
);
14602 e
= purpose_member (name
, TYPE_VALUES (enumtype
));
14603 return e
? TREE_VALUE (e
) : NULL_TREE
;
14607 /* We're defining DECL. Make sure that its type is OK. */
14610 check_function_type (tree decl
, tree current_function_parms
)
14612 tree fntype
= TREE_TYPE (decl
);
14613 tree return_type
= complete_type (TREE_TYPE (fntype
));
14615 /* In a function definition, arg types must be complete. */
14616 require_complete_types_for_parms (current_function_parms
);
14618 if (dependent_type_p (return_type
)
14619 || type_uses_auto (return_type
))
14621 if (!COMPLETE_OR_VOID_TYPE_P (return_type
))
14623 tree args
= TYPE_ARG_TYPES (fntype
);
14625 error ("return type %q#T is incomplete", return_type
);
14627 /* Make it return void instead. */
14628 if (TREE_CODE (fntype
) == METHOD_TYPE
)
14629 fntype
= build_method_type_directly (TREE_TYPE (TREE_VALUE (args
)),
14631 TREE_CHAIN (args
));
14633 fntype
= build_function_type (void_type_node
, args
);
14635 = build_exception_variant (fntype
,
14636 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (decl
)));
14637 fntype
= (cp_build_type_attribute_variant
14638 (fntype
, TYPE_ATTRIBUTES (TREE_TYPE (decl
))));
14639 TREE_TYPE (decl
) = fntype
;
14642 abstract_virtuals_error (decl
, TREE_TYPE (fntype
));
14645 /* True iff FN is an implicitly-defined default constructor. */
14648 implicit_default_ctor_p (tree fn
)
14650 return (DECL_CONSTRUCTOR_P (fn
)
14651 && !user_provided_p (fn
)
14652 && sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (fn
)));
14655 /* Clobber the contents of *this to let the back end know that the object
14656 storage is dead when we enter the constructor or leave the destructor. */
14659 build_clobber_this ()
14661 /* Clobbering an empty base is pointless, and harmful if its one byte
14662 TYPE_SIZE overlays real data. */
14663 if (is_empty_class (current_class_type
))
14666 /* If we have virtual bases, clobber the whole object, but only if we're in
14667 charge. If we don't have virtual bases, clobber the as-base type so we
14668 don't mess with tail padding. */
14669 bool vbases
= CLASSTYPE_VBASECLASSES (current_class_type
);
14671 tree ctype
= current_class_type
;
14673 ctype
= CLASSTYPE_AS_BASE (ctype
);
14675 tree clobber
= build_constructor (ctype
, NULL
);
14676 TREE_THIS_VOLATILE (clobber
) = true;
14678 tree thisref
= current_class_ref
;
14679 if (ctype
!= current_class_type
)
14681 thisref
= build_nop (build_reference_type (ctype
), current_class_ptr
);
14682 thisref
= convert_from_reference (thisref
);
14685 tree exprstmt
= build2 (MODIFY_EXPR
, void_type_node
, thisref
, clobber
);
14687 exprstmt
= build_if_in_charge (exprstmt
);
14692 /* Create the FUNCTION_DECL for a function definition.
14693 DECLSPECS and DECLARATOR are the parts of the declaration;
14694 they describe the function's name and the type it returns,
14695 but twisted together in a fashion that parallels the syntax of C.
14697 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
14698 DECLARATOR is really the DECL for the function we are about to
14699 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
14700 indicating that the function is an inline defined in-class.
14702 This function creates a binding context for the function body
14703 as well as setting up the FUNCTION_DECL in current_function_decl.
14705 For C++, we must first check whether that datum makes any sense.
14706 For example, "class A local_a(1,2);" means that variable local_a
14707 is an aggregate of type A, which should have a constructor
14708 applied to it with the argument list [1, 2].
14710 On entry, DECL_INITIAL (decl1) should be NULL_TREE or error_mark_node,
14711 or may be a BLOCK if the function has been defined previously
14712 in this translation unit. On exit, DECL_INITIAL (decl1) will be
14713 error_mark_node if the function has never been defined, or
14714 a BLOCK if the function has been defined somewhere. */
14717 start_preparsed_function (tree decl1
, tree attrs
, int flags
)
14719 tree ctype
= NULL_TREE
;
14722 int doing_friend
= 0;
14723 cp_binding_level
*bl
;
14724 tree current_function_parms
;
14725 struct c_fileinfo
*finfo
14726 = get_fileinfo (LOCATION_FILE (DECL_SOURCE_LOCATION (decl1
)));
14727 bool honor_interface
;
14729 /* Sanity check. */
14730 gcc_assert (VOID_TYPE_P (TREE_VALUE (void_list_node
)));
14731 gcc_assert (TREE_CHAIN (void_list_node
) == NULL_TREE
);
14733 fntype
= TREE_TYPE (decl1
);
14734 if (TREE_CODE (fntype
) == METHOD_TYPE
)
14735 ctype
= TYPE_METHOD_BASETYPE (fntype
);
14737 /* ISO C++ 11.4/5. A friend function defined in a class is in
14738 the (lexical) scope of the class in which it is defined. */
14739 if (!ctype
&& DECL_FRIEND_P (decl1
))
14741 ctype
= DECL_FRIEND_CONTEXT (decl1
);
14743 /* CTYPE could be null here if we're dealing with a template;
14744 for example, `inline friend float foo()' inside a template
14745 will have no CTYPE set. */
14746 if (ctype
&& TREE_CODE (ctype
) != RECORD_TYPE
)
14752 if (DECL_DECLARED_INLINE_P (decl1
)
14753 && lookup_attribute ("noinline", attrs
))
14754 warning_at (DECL_SOURCE_LOCATION (decl1
), 0,
14755 "inline function %qD given attribute noinline", decl1
);
14757 /* Handle gnu_inline attribute. */
14758 if (GNU_INLINE_P (decl1
))
14760 DECL_EXTERNAL (decl1
) = 1;
14761 DECL_NOT_REALLY_EXTERN (decl1
) = 0;
14762 DECL_INTERFACE_KNOWN (decl1
) = 1;
14763 DECL_DISREGARD_INLINE_LIMITS (decl1
) = 1;
14766 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl1
))
14767 /* This is a constructor, we must ensure that any default args
14768 introduced by this definition are propagated to the clones
14769 now. The clones are used directly in overload resolution. */
14770 adjust_clone_args (decl1
);
14772 /* Sometimes we don't notice that a function is a static member, and
14773 build a METHOD_TYPE for it. Fix that up now. */
14774 gcc_assert (!(ctype
!= NULL_TREE
&& DECL_STATIC_FUNCTION_P (decl1
)
14775 && TREE_CODE (TREE_TYPE (decl1
)) == METHOD_TYPE
));
14777 /* Set up current_class_type, and enter the scope of the class, if
14780 push_nested_class (ctype
);
14781 else if (DECL_STATIC_FUNCTION_P (decl1
))
14782 push_nested_class (DECL_CONTEXT (decl1
));
14784 /* Now that we have entered the scope of the class, we must restore
14785 the bindings for any template parameters surrounding DECL1, if it
14786 is an inline member template. (Order is important; consider the
14787 case where a template parameter has the same name as a field of
14788 the class.) It is not until after this point that
14789 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
14790 if (flags
& SF_INCLASS_INLINE
)
14791 maybe_begin_member_template_processing (decl1
);
14793 /* Effective C++ rule 15. */
14795 && DECL_OVERLOADED_OPERATOR_P (decl1
) == NOP_EXPR
14796 && VOID_TYPE_P (TREE_TYPE (fntype
)))
14797 warning (OPT_Weffc__
, "%<operator=%> should return a reference to %<*this%>");
14799 /* Make the init_value nonzero so pushdecl knows this is not tentative.
14800 error_mark_node is replaced below (in poplevel) with the BLOCK. */
14801 if (!DECL_INITIAL (decl1
))
14802 DECL_INITIAL (decl1
) = error_mark_node
;
14804 /* This function exists in static storage.
14805 (This does not mean `static' in the C sense!) */
14806 TREE_STATIC (decl1
) = 1;
14808 /* We must call push_template_decl after current_class_type is set
14809 up. (If we are processing inline definitions after exiting a
14810 class scope, current_class_type will be NULL_TREE until set above
14811 by push_nested_class.) */
14812 if (processing_template_decl
)
14814 tree newdecl1
= push_template_decl (decl1
);
14815 if (newdecl1
== error_mark_node
)
14817 if (ctype
|| DECL_STATIC_FUNCTION_P (decl1
))
14818 pop_nested_class ();
14824 /* We are now in the scope of the function being defined. */
14825 current_function_decl
= decl1
;
14827 /* Save the parm names or decls from this function's declarator
14828 where store_parm_decls will find them. */
14829 current_function_parms
= DECL_ARGUMENTS (decl1
);
14831 /* Make sure the parameter and return types are reasonable. When
14832 you declare a function, these types can be incomplete, but they
14833 must be complete when you define the function. */
14834 check_function_type (decl1
, current_function_parms
);
14836 /* Build the return declaration for the function. */
14837 restype
= TREE_TYPE (fntype
);
14839 if (DECL_RESULT (decl1
) == NULL_TREE
)
14843 resdecl
= build_decl (input_location
, RESULT_DECL
, 0, restype
);
14844 DECL_ARTIFICIAL (resdecl
) = 1;
14845 DECL_IGNORED_P (resdecl
) = 1;
14846 DECL_RESULT (decl1
) = resdecl
;
14848 cp_apply_type_quals_to_decl (cp_type_quals (restype
), resdecl
);
14851 /* Let the user know we're compiling this function. */
14852 announce_function (decl1
);
14854 /* Record the decl so that the function name is defined.
14855 If we already have a decl for this name, and it is a FUNCTION_DECL,
14856 use the old decl. */
14857 if (!processing_template_decl
&& !(flags
& SF_PRE_PARSED
))
14859 /* A specialization is not used to guide overload resolution. */
14860 if (!DECL_FUNCTION_MEMBER_P (decl1
)
14861 && !(DECL_USE_TEMPLATE (decl1
) &&
14862 PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl1
))))
14864 tree olddecl
= pushdecl (decl1
);
14866 if (olddecl
== error_mark_node
)
14867 /* If something went wrong when registering the declaration,
14868 use DECL1; we have to have a FUNCTION_DECL to use when
14869 parsing the body of the function. */
14873 /* Otherwise, OLDDECL is either a previous declaration
14874 of the same function or DECL1 itself. */
14876 if (warn_missing_declarations
14877 && olddecl
== decl1
14878 && !DECL_MAIN_P (decl1
)
14879 && TREE_PUBLIC (decl1
)
14880 && !DECL_DECLARED_INLINE_P (decl1
))
14884 /* Check whether DECL1 is in an anonymous
14886 for (context
= DECL_CONTEXT (decl1
);
14888 context
= DECL_CONTEXT (context
))
14890 if (TREE_CODE (context
) == NAMESPACE_DECL
14891 && DECL_NAME (context
) == NULL_TREE
)
14895 if (context
== NULL
)
14896 warning_at (DECL_SOURCE_LOCATION (decl1
),
14897 OPT_Wmissing_declarations
,
14898 "no previous declaration for %qD", decl1
);
14906 /* We need to set the DECL_CONTEXT. */
14907 if (!DECL_CONTEXT (decl1
) && DECL_TEMPLATE_INFO (decl1
))
14908 DECL_CONTEXT (decl1
) = DECL_CONTEXT (DECL_TI_TEMPLATE (decl1
));
14910 fntype
= TREE_TYPE (decl1
);
14911 restype
= TREE_TYPE (fntype
);
14913 /* If #pragma weak applies, mark the decl appropriately now.
14914 The pragma only applies to global functions. Because
14915 determining whether or not the #pragma applies involves
14916 computing the mangled name for the declaration, we cannot
14917 apply the pragma until after we have merged this declaration
14918 with any previous declarations; if the original declaration
14919 has a linkage specification, that specification applies to
14920 the definition as well, and may affect the mangled name. */
14921 if (DECL_FILE_SCOPE_P (decl1
))
14922 maybe_apply_pragma_weak (decl1
);
14925 /* Reset this in case the call to pushdecl changed it. */
14926 current_function_decl
= decl1
;
14928 gcc_assert (DECL_INITIAL (decl1
));
14930 /* This function may already have been parsed, in which case just
14931 return; our caller will skip over the body without parsing. */
14932 if (DECL_INITIAL (decl1
) != error_mark_node
)
14935 /* Initialize RTL machinery. We cannot do this until
14936 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
14937 even when processing a template; this is how we get
14938 CFUN set up, and our per-function variables initialized.
14939 FIXME factor out the non-RTL stuff. */
14940 bl
= current_binding_level
;
14941 allocate_struct_function (decl1
, processing_template_decl
);
14943 /* Initialize the language data structures. Whenever we start
14944 a new function, we destroy temporaries in the usual way. */
14945 cfun
->language
= ggc_cleared_alloc
<language_function
> ();
14946 current_stmt_tree ()->stmts_are_full_exprs_p
= 1;
14947 current_binding_level
= bl
;
14949 if (!processing_template_decl
&& type_uses_auto (restype
))
14951 FNDECL_USED_AUTO (decl1
) = true;
14952 current_function_auto_return_pattern
= restype
;
14955 /* Start the statement-tree, start the tree now. */
14956 DECL_SAVED_TREE (decl1
) = push_stmt_list ();
14958 /* If we are (erroneously) defining a function that we have already
14959 defined before, wipe out what we knew before. */
14960 if (!DECL_PENDING_INLINE_P (decl1
))
14961 DECL_SAVED_FUNCTION_DATA (decl1
) = NULL
;
14963 if (ctype
&& !doing_friend
&& !DECL_STATIC_FUNCTION_P (decl1
))
14965 /* We know that this was set up by `grokclassfn'. We do not
14966 wait until `store_parm_decls', since evil parse errors may
14967 never get us to that point. Here we keep the consistency
14968 between `current_class_type' and `current_class_ptr'. */
14969 tree t
= DECL_ARGUMENTS (decl1
);
14971 gcc_assert (t
!= NULL_TREE
&& TREE_CODE (t
) == PARM_DECL
);
14972 gcc_assert (TYPE_PTR_P (TREE_TYPE (t
)));
14974 cp_function_chain
->x_current_class_ref
14975 = cp_build_indirect_ref (t
, RO_NULL
, tf_warning_or_error
);
14976 /* Set this second to avoid shortcut in cp_build_indirect_ref. */
14977 cp_function_chain
->x_current_class_ptr
= t
;
14979 /* Constructors and destructors need to know whether they're "in
14980 charge" of initializing virtual base classes. */
14981 t
= DECL_CHAIN (t
);
14982 if (DECL_HAS_IN_CHARGE_PARM_P (decl1
))
14984 current_in_charge_parm
= t
;
14985 t
= DECL_CHAIN (t
);
14987 if (DECL_HAS_VTT_PARM_P (decl1
))
14989 gcc_assert (DECL_NAME (t
) == vtt_parm_identifier
);
14990 current_vtt_parm
= t
;
14994 honor_interface
= (!DECL_TEMPLATE_INSTANTIATION (decl1
)
14995 /* Implicitly-defined methods (like the
14996 destructor for a class in which no destructor
14997 is explicitly declared) must not be defined
14998 until their definition is needed. So, we
14999 ignore interface specifications for
15000 compiler-generated functions. */
15001 && !DECL_ARTIFICIAL (decl1
));
15003 if (processing_template_decl
)
15004 /* Don't mess with interface flags. */;
15005 else if (DECL_INTERFACE_KNOWN (decl1
))
15007 tree ctx
= decl_function_context (decl1
);
15009 if (DECL_NOT_REALLY_EXTERN (decl1
))
15010 DECL_EXTERNAL (decl1
) = 0;
15012 if (ctx
!= NULL_TREE
&& vague_linkage_p (ctx
))
15013 /* This is a function in a local class in an extern inline
15014 or template function. */
15015 comdat_linkage (decl1
);
15017 /* If this function belongs to an interface, it is public.
15018 If it belongs to someone else's interface, it is also external.
15019 This only affects inlines and template instantiations. */
15020 else if (!finfo
->interface_unknown
&& honor_interface
)
15022 if (DECL_DECLARED_INLINE_P (decl1
)
15023 || DECL_TEMPLATE_INSTANTIATION (decl1
))
15025 DECL_EXTERNAL (decl1
)
15026 = (finfo
->interface_only
15027 || (DECL_DECLARED_INLINE_P (decl1
)
15028 && ! flag_implement_inlines
15029 && !DECL_VINDEX (decl1
)));
15031 /* For WIN32 we also want to put these in linkonce sections. */
15032 maybe_make_one_only (decl1
);
15035 DECL_EXTERNAL (decl1
) = 0;
15036 DECL_INTERFACE_KNOWN (decl1
) = 1;
15037 /* If this function is in an interface implemented in this file,
15038 make sure that the back end knows to emit this function
15040 if (!DECL_EXTERNAL (decl1
))
15041 mark_needed (decl1
);
15043 else if (finfo
->interface_unknown
&& finfo
->interface_only
15044 && honor_interface
)
15046 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
15047 interface, we will have both finfo->interface_unknown and
15048 finfo->interface_only set. In that case, we don't want to
15049 use the normal heuristics because someone will supply a
15050 #pragma implementation elsewhere, and deducing it here would
15051 produce a conflict. */
15052 comdat_linkage (decl1
);
15053 DECL_EXTERNAL (decl1
) = 0;
15054 DECL_INTERFACE_KNOWN (decl1
) = 1;
15055 DECL_DEFER_OUTPUT (decl1
) = 1;
15059 /* This is a definition, not a reference.
15060 So clear DECL_EXTERNAL, unless this is a GNU extern inline. */
15061 if (!GNU_INLINE_P (decl1
))
15062 DECL_EXTERNAL (decl1
) = 0;
15064 if ((DECL_DECLARED_INLINE_P (decl1
)
15065 || DECL_TEMPLATE_INSTANTIATION (decl1
))
15066 && ! DECL_INTERFACE_KNOWN (decl1
))
15067 DECL_DEFER_OUTPUT (decl1
) = 1;
15069 DECL_INTERFACE_KNOWN (decl1
) = 1;
15072 /* Determine the ELF visibility attribute for the function. We must not
15073 do this before calling "pushdecl", as we must allow "duplicate_decls"
15074 to merge any attributes appropriately. We also need to wait until
15076 if (!DECL_CLONED_FUNCTION_P (decl1
))
15077 determine_visibility (decl1
);
15079 if (!processing_template_decl
)
15080 maybe_instantiate_noexcept (decl1
);
15082 begin_scope (sk_function_parms
, decl1
);
15086 if (DECL_DESTRUCTOR_P (decl1
)
15087 || (DECL_CONSTRUCTOR_P (decl1
)
15088 && targetm
.cxx
.cdtor_returns_this ()))
15089 cdtor_label
= create_artificial_label (input_location
);
15091 start_fname_decls ();
15093 store_parm_decls (current_function_parms
);
15095 if (!processing_template_decl
15096 && (flag_lifetime_dse
> 1)
15097 && DECL_CONSTRUCTOR_P (decl1
)
15098 && !DECL_CLONED_FUNCTION_P (decl1
)
15099 /* Clobbering an empty base is harmful if it overlays real data. */
15100 && !is_empty_class (current_class_type
)
15101 /* We can't clobber safely for an implicitly-defined default constructor
15102 because part of the initialization might happen before we enter the
15103 constructor, via AGGR_INIT_ZERO_FIRST (c++/68006). */
15104 && !implicit_default_ctor_p (decl1
))
15105 finish_expr_stmt (build_clobber_this ());
15107 if (!processing_template_decl
15108 && DECL_CONSTRUCTOR_P (decl1
)
15109 && (flag_sanitize
& SANITIZE_VPTR
)
15110 && !DECL_CLONED_FUNCTION_P (decl1
)
15111 && !implicit_default_ctor_p (decl1
))
15112 cp_ubsan_maybe_initialize_vtbl_ptrs (current_class_ptr
);
15118 /* Like start_preparsed_function, except that instead of a
15119 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
15121 Returns true on success. If the DECLARATOR is not suitable
15122 for a function, we return false, which tells the parser to
15123 skip the entire function. */
15126 start_function (cp_decl_specifier_seq
*declspecs
,
15127 const cp_declarator
*declarator
,
15132 decl1
= grokdeclarator (declarator
, declspecs
, FUNCDEF
, 1, &attrs
);
15133 invoke_plugin_callbacks (PLUGIN_START_PARSE_FUNCTION
, decl1
);
15134 if (decl1
== error_mark_node
)
15136 /* If the declarator is not suitable for a function definition,
15137 cause a syntax error. */
15138 if (decl1
== NULL_TREE
|| TREE_CODE (decl1
) != FUNCTION_DECL
)
15140 error ("invalid function declaration");
15144 if (DECL_MAIN_P (decl1
))
15145 /* main must return int. grokfndecl should have corrected it
15146 (and issued a diagnostic) if the user got it wrong. */
15147 gcc_assert (same_type_p (TREE_TYPE (TREE_TYPE (decl1
)),
15148 integer_type_node
));
15150 return start_preparsed_function (decl1
, attrs
, /*flags=*/SF_DEFAULT
);
15153 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
15157 use_eh_spec_block (tree fn
)
15159 return (flag_exceptions
&& flag_enforce_eh_specs
15160 && !processing_template_decl
15161 && !type_throw_all_p (TREE_TYPE (fn
))
15162 /* We insert the EH_SPEC_BLOCK only in the original
15163 function; then, it is copied automatically to the
15165 && !DECL_CLONED_FUNCTION_P (fn
)
15166 /* Implicitly-generated constructors and destructors have
15167 exception specifications. However, those specifications
15168 are the union of the possible exceptions specified by the
15169 constructors/destructors for bases and members, so no
15170 unallowed exception will ever reach this function. By
15171 not creating the EH_SPEC_BLOCK we save a little memory,
15172 and we avoid spurious warnings about unreachable
15174 && !DECL_DEFAULTED_FN (fn
));
15177 /* Store the parameter declarations into the current function declaration.
15178 This is called after parsing the parameter declarations, before
15179 digesting the body of the function.
15181 Also install to binding contour return value identifier, if any. */
15184 store_parm_decls (tree current_function_parms
)
15186 tree fndecl
= current_function_decl
;
15189 /* This is a chain of any other decls that came in among the parm
15190 declarations. If a parm is declared with enum {foo, bar} x;
15191 then CONST_DECLs for foo and bar are put here. */
15192 tree nonparms
= NULL_TREE
;
15194 if (current_function_parms
)
15196 /* This case is when the function was defined with an ANSI prototype.
15197 The parms already have decls, so we need not do anything here
15198 except record them as in effect
15199 and complain if any redundant old-style parm decls were written. */
15201 tree specparms
= current_function_parms
;
15204 /* Must clear this because it might contain TYPE_DECLs declared
15206 current_binding_level
->names
= NULL
;
15208 /* If we're doing semantic analysis, then we'll call pushdecl
15209 for each of these. We must do them in reverse order so that
15210 they end in the correct forward order. */
15211 specparms
= nreverse (specparms
);
15213 for (parm
= specparms
; parm
; parm
= next
)
15215 next
= DECL_CHAIN (parm
);
15216 if (TREE_CODE (parm
) == PARM_DECL
)
15220 /* If we find an enum constant or a type tag,
15221 put it aside for the moment. */
15222 TREE_CHAIN (parm
) = NULL_TREE
;
15223 nonparms
= chainon (nonparms
, parm
);
15227 /* Get the decls in their original chain order and record in the
15228 function. This is all and only the PARM_DECLs that were
15229 pushed into scope by the loop above. */
15230 DECL_ARGUMENTS (fndecl
) = getdecls ();
15233 DECL_ARGUMENTS (fndecl
) = NULL_TREE
;
15235 /* Now store the final chain of decls for the arguments
15236 as the decl-chain of the current lexical scope.
15237 Put the enumerators in as well, at the front so that
15238 DECL_ARGUMENTS is not modified. */
15239 current_binding_level
->names
= chainon (nonparms
, DECL_ARGUMENTS (fndecl
));
15241 if (use_eh_spec_block (current_function_decl
))
15242 current_eh_spec_block
= begin_eh_spec_block ();
15246 /* We have finished doing semantic analysis on DECL, but have not yet
15247 generated RTL for its body. Save away our current state, so that
15248 when we want to generate RTL later we know what to do. */
15251 save_function_data (tree decl
)
15253 struct language_function
*f
;
15255 /* Save the language-specific per-function data so that we can
15256 get it back when we really expand this function. */
15257 gcc_assert (!DECL_PENDING_INLINE_P (decl
));
15260 f
= ggc_alloc
<language_function
> ();
15261 memcpy (f
, cp_function_chain
, sizeof (struct language_function
));
15262 DECL_SAVED_FUNCTION_DATA (decl
) = f
;
15264 /* Clear out the bits we don't need. */
15265 f
->base
.x_stmt_tree
.x_cur_stmt_list
= NULL
;
15266 f
->bindings
= NULL
;
15267 f
->x_local_names
= NULL
;
15268 f
->base
.local_typedefs
= NULL
;
15272 /* Set the return value of the constructor (if present). */
15275 finish_constructor_body (void)
15280 if (targetm
.cxx
.cdtor_returns_this ())
15282 /* Any return from a constructor will end up here. */
15283 add_stmt (build_stmt (input_location
, LABEL_EXPR
, cdtor_label
));
15285 val
= DECL_ARGUMENTS (current_function_decl
);
15286 val
= build2 (MODIFY_EXPR
, TREE_TYPE (val
),
15287 DECL_RESULT (current_function_decl
), val
);
15288 /* Return the address of the object. */
15289 exprstmt
= build_stmt (input_location
, RETURN_EXPR
, val
);
15290 add_stmt (exprstmt
);
15294 /* Do all the processing for the beginning of a destructor; set up the
15295 vtable pointers and cleanups for bases and members. */
15298 begin_destructor_body (void)
15300 tree compound_stmt
;
15302 /* If the CURRENT_CLASS_TYPE is incomplete, we will have already
15303 issued an error message. We still want to try to process the
15304 body of the function, but initialize_vtbl_ptrs will crash if
15305 TYPE_BINFO is NULL. */
15306 if (COMPLETE_TYPE_P (current_class_type
))
15308 compound_stmt
= begin_compound_stmt (0);
15309 /* Make all virtual function table pointers in non-virtual base
15310 classes point to CURRENT_CLASS_TYPE's virtual function
15312 initialize_vtbl_ptrs (current_class_ptr
);
15313 finish_compound_stmt (compound_stmt
);
15315 if (flag_lifetime_dse
15316 /* Clobbering an empty base is harmful if it overlays real data. */
15317 && !is_empty_class (current_class_type
))
15318 finish_decl_cleanup (NULL_TREE
, build_clobber_this ());
15320 /* And insert cleanups for our bases and members so that they
15321 will be properly destroyed if we throw. */
15322 push_base_cleanups ();
15326 /* At the end of every destructor we generate code to delete the object if
15327 necessary. Do that now. */
15330 finish_destructor_body (void)
15334 /* Any return from a destructor will end up here; that way all base
15335 and member cleanups will be run when the function returns. */
15336 add_stmt (build_stmt (input_location
, LABEL_EXPR
, cdtor_label
));
15338 if (targetm
.cxx
.cdtor_returns_this ())
15342 val
= DECL_ARGUMENTS (current_function_decl
);
15343 val
= build2 (MODIFY_EXPR
, TREE_TYPE (val
),
15344 DECL_RESULT (current_function_decl
), val
);
15345 /* Return the address of the object. */
15346 exprstmt
= build_stmt (input_location
, RETURN_EXPR
, val
);
15347 add_stmt (exprstmt
);
15351 /* Do the necessary processing for the beginning of a function body, which
15352 in this case includes member-initializers, but not the catch clauses of
15353 a function-try-block. Currently, this means opening a binding level
15354 for the member-initializers (in a ctor), member cleanups (in a dtor),
15355 and capture proxies (in a lambda operator()). */
15358 begin_function_body (void)
15362 if (! FUNCTION_NEEDS_BODY_BLOCK (current_function_decl
))
15365 if (processing_template_decl
)
15366 /* Do nothing now. */;
15368 /* Always keep the BLOCK node associated with the outermost pair of
15369 curly braces of a function. These are needed for correct
15370 operation of dwarfout.c. */
15371 keep_next_level (true);
15373 stmt
= begin_compound_stmt (BCS_FN_BODY
);
15375 if (processing_template_decl
)
15376 /* Do nothing now. */;
15377 else if (DECL_DESTRUCTOR_P (current_function_decl
))
15378 begin_destructor_body ();
15383 /* Do the processing for the end of a function body. Currently, this means
15384 closing out the cleanups for fully-constructed bases and members, and in
15385 the case of the destructor, deleting the object if desired. Again, this
15386 is only meaningful for [cd]tors, since they are the only functions where
15387 there is a significant distinction between the main body and any
15388 function catch clauses. Handling, say, main() return semantics here
15389 would be wrong, as flowing off the end of a function catch clause for
15390 main() would also need to return 0. */
15393 finish_function_body (tree compstmt
)
15395 if (compstmt
== NULL_TREE
)
15398 /* Close the block. */
15399 finish_compound_stmt (compstmt
);
15401 if (processing_template_decl
)
15402 /* Do nothing now. */;
15403 else if (DECL_CONSTRUCTOR_P (current_function_decl
))
15404 finish_constructor_body ();
15405 else if (DECL_DESTRUCTOR_P (current_function_decl
))
15406 finish_destructor_body ();
15409 /* Given a function, returns the BLOCK corresponding to the outermost level
15410 of curly braces, skipping the artificial block created for constructor
15414 outer_curly_brace_block (tree fndecl
)
15416 tree block
= DECL_INITIAL (fndecl
);
15417 if (BLOCK_OUTER_CURLY_BRACE_P (block
))
15419 block
= BLOCK_SUBBLOCKS (block
);
15420 if (BLOCK_OUTER_CURLY_BRACE_P (block
))
15422 block
= BLOCK_SUBBLOCKS (block
);
15423 gcc_assert (BLOCK_OUTER_CURLY_BRACE_P (block
));
15427 /* If FNDECL is a class's key method, add the class to the list of
15428 keyed classes that should be emitted. */
15431 record_key_method_defined (tree fndecl
)
15433 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fndecl
)
15434 && DECL_VIRTUAL_P (fndecl
)
15435 && !processing_template_decl
)
15437 tree fnclass
= DECL_CONTEXT (fndecl
);
15438 if (fndecl
== CLASSTYPE_KEY_METHOD (fnclass
))
15439 keyed_classes
= tree_cons (NULL_TREE
, fnclass
, keyed_classes
);
15443 /* Subroutine of finish_function.
15444 Save the body of constexpr functions for possible
15445 future compile time evaluation. */
15448 maybe_save_function_definition (tree fun
)
15450 if (!processing_template_decl
15451 && DECL_DECLARED_CONSTEXPR_P (fun
)
15452 && !cp_function_chain
->invalid_constexpr
15453 && !DECL_CLONED_FUNCTION_P (fun
))
15454 register_constexpr_fundef (fun
, DECL_SAVED_TREE (fun
));
15457 /* Finish up a function declaration and compile that function
15458 all the way to assembler language output. The free the storage
15459 for the function definition.
15461 FLAGS is a bitwise or of the following values:
15463 We just finished processing the body of an in-class inline
15464 function definition. (This processing will have taken place
15465 after the class definition is complete.) */
15468 finish_function (int flags
)
15470 tree fndecl
= current_function_decl
;
15471 tree fntype
, ctype
= NULL_TREE
;
15472 int inclass_inline
= (flags
& 2) != 0;
15474 /* When we get some parse errors, we can end up without a
15475 current_function_decl, so cope. */
15476 if (fndecl
== NULL_TREE
)
15477 return error_mark_node
;
15479 if (c_dialect_objc ())
15480 objc_finish_function ();
15482 record_key_method_defined (fndecl
);
15484 fntype
= TREE_TYPE (fndecl
);
15486 /* TREE_READONLY (fndecl) = 1;
15487 This caused &foo to be of type ptr-to-const-function
15488 which then got a warning when stored in a ptr-to-function variable. */
15490 gcc_assert (building_stmt_list_p ());
15491 /* The current function is being defined, so its DECL_INITIAL should
15492 be set, and unless there's a multiple definition, it should be
15493 error_mark_node. */
15494 gcc_assert (DECL_INITIAL (fndecl
) == error_mark_node
);
15496 /* For a cloned function, we've already got all the code we need;
15497 there's no need to add any extra bits. */
15498 if (!DECL_CLONED_FUNCTION_P (fndecl
))
15500 /* Make it so that `main' always returns 0 by default. */
15501 if (DECL_MAIN_P (current_function_decl
))
15502 finish_return_stmt (integer_zero_node
);
15504 if (use_eh_spec_block (current_function_decl
))
15505 finish_eh_spec_block (TYPE_RAISES_EXCEPTIONS
15506 (TREE_TYPE (current_function_decl
)),
15507 current_eh_spec_block
);
15510 /* If we're saving up tree structure, tie off the function now. */
15511 DECL_SAVED_TREE (fndecl
) = pop_stmt_list (DECL_SAVED_TREE (fndecl
));
15513 if (fn_contains_cilk_spawn_p (cfun
) && !processing_template_decl
)
15514 cfun
->cilk_frame_decl
= insert_cilk_frame (fndecl
);
15516 finish_fname_decls ();
15518 /* If this function can't throw any exceptions, remember that. */
15519 if (!processing_template_decl
15520 && !cp_function_chain
->can_throw
15521 && !flag_non_call_exceptions
15522 && !decl_replaceable_p (fndecl
))
15523 TREE_NOTHROW (fndecl
) = 1;
15525 /* This must come after expand_function_end because cleanups might
15526 have declarations (from inline functions) that need to go into
15527 this function's blocks. */
15529 /* If the current binding level isn't the outermost binding level
15530 for this function, either there is a bug, or we have experienced
15531 syntax errors and the statement tree is malformed. */
15532 if (current_binding_level
->kind
!= sk_function_parms
)
15534 /* Make sure we have already experienced errors. */
15535 gcc_assert (errorcount
);
15537 /* Throw away the broken statement tree and extra binding
15539 DECL_SAVED_TREE (fndecl
) = alloc_stmt_list ();
15541 while (current_binding_level
->kind
!= sk_function_parms
)
15543 if (current_binding_level
->kind
== sk_class
)
15544 pop_nested_class ();
15546 poplevel (0, 0, 0);
15549 poplevel (1, 0, 1);
15551 /* Statements should always be full-expressions at the outermost set
15552 of curly braces for a function. */
15553 gcc_assert (stmts_are_full_exprs_p ());
15555 /* If there are no return statements in a function with auto return type,
15556 the return type is void. But if the declared type is something like
15557 auto*, this is an error. */
15558 if (!processing_template_decl
&& FNDECL_USED_AUTO (fndecl
)
15559 && TREE_TYPE (fntype
) == current_function_auto_return_pattern
)
15561 if (!is_auto (current_function_auto_return_pattern
)
15562 && !current_function_returns_value
&& !current_function_returns_null
)
15564 error ("no return statements in function returning %qT",
15565 current_function_auto_return_pattern
);
15566 inform (input_location
, "only plain %<auto%> return type can be "
15567 "deduced to %<void%>");
15569 apply_deduced_return_type (fndecl
, void_type_node
);
15570 fntype
= TREE_TYPE (fndecl
);
15573 // If this is a concept, check that the definition is reasonable.
15574 if (DECL_DECLARED_CONCEPT_P (fndecl
))
15575 check_function_concept (fndecl
);
15577 /* Lambda closure members are implicitly constexpr if possible. */
15578 if (cxx_dialect
>= cxx1z
15579 && LAMBDA_TYPE_P (CP_DECL_CONTEXT (fndecl
))
15580 && (processing_template_decl
15581 || is_valid_constexpr_fn (fndecl
, /*complain*/false))
15582 && potential_constant_expression (DECL_SAVED_TREE (fndecl
)))
15583 DECL_DECLARED_CONSTEXPR_P (fndecl
) = true;
15585 /* Save constexpr function body before it gets munged by
15586 the NRV transformation. */
15587 maybe_save_function_definition (fndecl
);
15589 /* Invoke the pre-genericize plugin before we start munging things. */
15590 if (!processing_template_decl
)
15591 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE
, fndecl
);
15593 /* Perform delayed folding before NRV transformation. */
15594 if (!processing_template_decl
)
15595 cp_fold_function (fndecl
);
15597 /* Set up the named return value optimization, if we can. Candidate
15598 variables are selected in check_return_expr. */
15599 if (current_function_return_value
)
15601 tree r
= current_function_return_value
;
15604 if (r
!= error_mark_node
15605 /* This is only worth doing for fns that return in memory--and
15606 simpler, since we don't have to worry about promoted modes. */
15607 && aggregate_value_p (TREE_TYPE (TREE_TYPE (fndecl
)), fndecl
)
15608 /* Only allow this for variables declared in the outer scope of
15609 the function so we know that their lifetime always ends with a
15610 return; see g++.dg/opt/nrv6.C. We could be more flexible if
15611 we were to do this optimization in tree-ssa. */
15612 && (outer
= outer_curly_brace_block (fndecl
))
15613 && chain_member (r
, BLOCK_VARS (outer
)))
15614 finalize_nrv (&DECL_SAVED_TREE (fndecl
), r
, DECL_RESULT (fndecl
));
15616 current_function_return_value
= NULL_TREE
;
15619 /* Remember that we were in class scope. */
15620 if (current_class_name
)
15621 ctype
= current_class_type
;
15623 /* Must mark the RESULT_DECL as being in this function. */
15624 DECL_CONTEXT (DECL_RESULT (fndecl
)) = fndecl
;
15626 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
15627 to the FUNCTION_DECL node itself. */
15628 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl
)) = fndecl
;
15630 /* Save away current state, if appropriate. */
15631 if (!processing_template_decl
)
15632 save_function_data (fndecl
);
15634 /* Complain if there's just no return statement. */
15635 if (warn_return_type
15636 && !VOID_TYPE_P (TREE_TYPE (fntype
))
15637 && !dependent_type_p (TREE_TYPE (fntype
))
15638 && !current_function_returns_value
&& !current_function_returns_null
15639 /* Don't complain if we abort or throw. */
15640 && !current_function_returns_abnormally
15641 /* Don't complain if there's an infinite loop. */
15642 && !current_function_infinite_loop
15643 /* Don't complain if we are declared noreturn. */
15644 && !TREE_THIS_VOLATILE (fndecl
)
15645 && !DECL_NAME (DECL_RESULT (fndecl
))
15646 && !TREE_NO_WARNING (fndecl
)
15647 /* Structor return values (if any) are set by the compiler. */
15648 && !DECL_CONSTRUCTOR_P (fndecl
)
15649 && !DECL_DESTRUCTOR_P (fndecl
)
15650 && targetm
.warn_func_return (fndecl
))
15652 warning (OPT_Wreturn_type
,
15653 "no return statement in function returning non-void");
15654 TREE_NO_WARNING (fndecl
) = 1;
15657 /* Store the end of the function, so that we get good line number
15658 info for the epilogue. */
15659 cfun
->function_end_locus
= input_location
;
15661 /* Complain about parameters that are only set, but never otherwise used. */
15662 if (warn_unused_but_set_parameter
15663 && !processing_template_decl
15664 && errorcount
== unused_but_set_errorcount
15665 && !DECL_CLONED_FUNCTION_P (fndecl
))
15669 for (decl
= DECL_ARGUMENTS (fndecl
);
15671 decl
= DECL_CHAIN (decl
))
15672 if (TREE_USED (decl
)
15673 && TREE_CODE (decl
) == PARM_DECL
15674 && !DECL_READ_P (decl
)
15675 && DECL_NAME (decl
)
15676 && !DECL_ARTIFICIAL (decl
)
15677 && !TREE_NO_WARNING (decl
)
15678 && !DECL_IN_SYSTEM_HEADER (decl
)
15679 && TREE_TYPE (decl
) != error_mark_node
15680 && TREE_CODE (TREE_TYPE (decl
)) != REFERENCE_TYPE
15681 && (!CLASS_TYPE_P (TREE_TYPE (decl
))
15682 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl
))))
15683 warning_at (DECL_SOURCE_LOCATION (decl
),
15684 OPT_Wunused_but_set_parameter
,
15685 "parameter %qD set but not used", decl
);
15686 unused_but_set_errorcount
= errorcount
;
15689 /* Complain about locally defined typedefs that are not used in this
15691 maybe_warn_unused_local_typedefs ();
15693 /* Possibly warn about unused parameters. */
15694 if (warn_unused_parameter
15695 && !processing_template_decl
15696 && !DECL_CLONED_FUNCTION_P (fndecl
))
15697 do_warn_unused_parameter (fndecl
);
15699 /* Genericize before inlining. */
15700 if (!processing_template_decl
)
15702 struct language_function
*f
= DECL_SAVED_FUNCTION_DATA (fndecl
);
15703 cp_genericize (fndecl
);
15704 /* Clear out the bits we don't need. */
15705 f
->x_current_class_ptr
= NULL
;
15706 f
->x_current_class_ref
= NULL
;
15707 f
->x_eh_spec_block
= NULL
;
15708 f
->x_in_charge_parm
= NULL
;
15709 f
->x_vtt_parm
= NULL
;
15710 f
->x_return_value
= NULL
;
15711 f
->bindings
= NULL
;
15712 f
->extern_decl_map
= NULL
;
15713 f
->infinite_loops
= NULL
;
15715 /* Clear out the bits we don't need. */
15716 local_names
= NULL
;
15718 /* We're leaving the context of this function, so zap cfun. It's still in
15719 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
15721 current_function_decl
= NULL
;
15723 /* If this is an in-class inline definition, we may have to pop the
15724 bindings for the template parameters that we added in
15725 maybe_begin_member_template_processing when start_function was
15727 if (inclass_inline
)
15728 maybe_end_member_template_processing ();
15730 /* Leave the scope of the class. */
15732 pop_nested_class ();
15737 current_function_decl
= NULL_TREE
;
15739 invoke_plugin_callbacks (PLUGIN_FINISH_PARSE_FUNCTION
, fndecl
);
15743 /* Create the FUNCTION_DECL for a function definition.
15744 DECLSPECS and DECLARATOR are the parts of the declaration;
15745 they describe the return type and the name of the function,
15746 but twisted together in a fashion that parallels the syntax of C.
15748 This function creates a binding context for the function body
15749 as well as setting up the FUNCTION_DECL in current_function_decl.
15751 Returns a FUNCTION_DECL on success.
15753 If the DECLARATOR is not suitable for a function (it defines a datum
15754 instead), we return 0, which tells yyparse to report a parse error.
15756 May return void_type_node indicating that this method is actually
15757 a friend. See grokfield for more details.
15759 Came here with a `.pushlevel' .
15761 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
15762 CHANGES TO CODE IN `grokfield'. */
15765 grokmethod (cp_decl_specifier_seq
*declspecs
,
15766 const cp_declarator
*declarator
, tree attrlist
)
15768 tree fndecl
= grokdeclarator (declarator
, declspecs
, MEMFUNCDEF
, 0,
15771 if (fndecl
== error_mark_node
)
15772 return error_mark_node
;
15774 if (fndecl
== NULL
|| TREE_CODE (fndecl
) != FUNCTION_DECL
)
15776 error ("invalid member function declaration");
15777 return error_mark_node
;
15781 cplus_decl_attributes (&fndecl
, attrlist
, 0);
15783 /* Pass friends other than inline friend functions back. */
15784 if (fndecl
== void_type_node
)
15787 if (DECL_IN_AGGR_P (fndecl
))
15789 if (DECL_CLASS_SCOPE_P (fndecl
))
15790 error ("%qD is already defined in class %qT", fndecl
,
15791 DECL_CONTEXT (fndecl
));
15792 return error_mark_node
;
15795 check_template_shadow (fndecl
);
15797 if (TREE_PUBLIC (fndecl
))
15798 DECL_COMDAT (fndecl
) = 1;
15799 DECL_DECLARED_INLINE_P (fndecl
) = 1;
15800 DECL_NO_INLINE_WARNING_P (fndecl
) = 1;
15802 /* We process method specializations in finish_struct_1. */
15803 if (processing_template_decl
&& !DECL_TEMPLATE_SPECIALIZATION (fndecl
))
15805 fndecl
= push_template_decl (fndecl
);
15806 if (fndecl
== error_mark_node
)
15810 if (! DECL_FRIEND_P (fndecl
))
15812 if (DECL_CHAIN (fndecl
))
15814 fndecl
= copy_node (fndecl
);
15815 TREE_CHAIN (fndecl
) = NULL_TREE
;
15819 cp_finish_decl (fndecl
, NULL_TREE
, false, NULL_TREE
, 0);
15821 DECL_IN_AGGR_P (fndecl
) = 1;
15826 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
15827 we can lay it out later, when and if its type becomes complete.
15829 Also handle constexpr variables where the initializer involves
15830 an unlowered PTRMEM_CST because the class isn't complete yet. */
15833 maybe_register_incomplete_var (tree var
)
15835 gcc_assert (VAR_P (var
));
15837 /* Keep track of variables with incomplete types. */
15838 if (!processing_template_decl
&& TREE_TYPE (var
) != error_mark_node
15839 && DECL_EXTERNAL (var
))
15841 tree inner_type
= TREE_TYPE (var
);
15843 while (TREE_CODE (inner_type
) == ARRAY_TYPE
)
15844 inner_type
= TREE_TYPE (inner_type
);
15845 inner_type
= TYPE_MAIN_VARIANT (inner_type
);
15847 if ((!COMPLETE_TYPE_P (inner_type
) && CLASS_TYPE_P (inner_type
))
15848 /* RTTI TD entries are created while defining the type_info. */
15849 || (TYPE_LANG_SPECIFIC (inner_type
)
15850 && TYPE_BEING_DEFINED (inner_type
)))
15852 incomplete_var iv
= {var
, inner_type
};
15853 vec_safe_push (incomplete_vars
, iv
);
15855 else if (!(DECL_LANG_SPECIFIC (var
) && DECL_TEMPLATE_INFO (var
))
15856 && decl_constant_var_p (var
)
15857 && (TYPE_PTRMEM_P (inner_type
) || CLASS_TYPE_P (inner_type
)))
15859 /* When the outermost open class is complete we can resolve any
15860 pointers-to-members. */
15861 tree context
= outermost_open_class ();
15862 incomplete_var iv
= {var
, context
};
15863 vec_safe_push (incomplete_vars
, iv
);
15868 /* Called when a class type (given by TYPE) is defined. If there are
15869 any existing VAR_DECLs whose type has been completed by this
15870 declaration, update them now. */
15873 complete_vars (tree type
)
15876 incomplete_var
*iv
;
15878 for (ix
= 0; vec_safe_iterate (incomplete_vars
, ix
, &iv
); )
15880 if (same_type_p (type
, iv
->incomplete_type
))
15882 tree var
= iv
->decl
;
15883 tree type
= TREE_TYPE (var
);
15885 if (type
!= error_mark_node
15886 && (TYPE_MAIN_VARIANT (strip_array_types (type
))
15887 == iv
->incomplete_type
))
15889 /* Complete the type of the variable. The VAR_DECL itself
15890 will be laid out in expand_expr. */
15891 complete_type (type
);
15892 cp_apply_type_quals_to_decl (cp_type_quals (type
), var
);
15895 /* Remove this entry from the list. */
15896 incomplete_vars
->unordered_remove (ix
);
15902 /* Check for pending declarations which may have abstract type. */
15903 complete_type_check_abstract (type
);
15906 /* If DECL is of a type which needs a cleanup, build and return an
15907 expression to perform that cleanup here. Return NULL_TREE if no
15908 cleanup need be done. DECL can also be a _REF when called from
15909 split_nonconstant_init_1. */
15912 cxx_maybe_build_cleanup (tree decl
, tsubst_flags_t complain
)
15918 /* Assume no cleanup is required. */
15919 cleanup
= NULL_TREE
;
15921 if (error_operand_p (decl
))
15924 /* Handle "__attribute__((cleanup))". We run the cleanup function
15925 before the destructor since the destructor is what actually
15926 terminates the lifetime of the object. */
15928 attr
= lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl
));
15937 /* Get the name specified by the user for the cleanup function. */
15938 id
= TREE_VALUE (TREE_VALUE (attr
));
15939 /* Look up the name to find the cleanup function to call. It is
15940 important to use lookup_name here because that is what is
15941 used in c-common.c:handle_cleanup_attribute when performing
15942 initial checks on the attribute. Note that those checks
15943 include ensuring that the function found is not an overloaded
15944 function, or an object with an overloaded call operator,
15945 etc.; we can rely on the fact that the function found is an
15946 ordinary FUNCTION_DECL. */
15947 fn
= lookup_name (id
);
15948 arg
= build_address (decl
);
15949 if (!mark_used (decl
, complain
) && !(complain
& tf_error
))
15950 return error_mark_node
;
15951 cleanup
= cp_build_function_call_nary (fn
, complain
, arg
, NULL_TREE
);
15952 if (cleanup
== error_mark_node
)
15953 return error_mark_node
;
15955 /* Handle ordinary C++ destructors. */
15956 type
= TREE_TYPE (decl
);
15957 if (type_build_dtor_call (type
))
15959 int flags
= LOOKUP_NORMAL
|LOOKUP_NONVIRTUAL
|LOOKUP_DESTRUCTOR
;
15963 if (TREE_CODE (type
) == ARRAY_TYPE
)
15966 addr
= build_address (decl
);
15968 call
= build_delete (TREE_TYPE (addr
), addr
,
15969 sfk_complete_destructor
, flags
, 0, complain
);
15970 if (call
== error_mark_node
)
15971 cleanup
= error_mark_node
;
15972 else if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type
))
15973 /* Discard the call. */;
15975 cleanup
= cp_build_compound_expr (cleanup
, call
, complain
);
15980 /* build_delete sets the location of the destructor call to the
15981 current location, even though the destructor is going to be
15982 called later, at the end of the current scope. This can lead to
15983 a "jumpy" behavior for users of debuggers when they step around
15984 the end of the block. So let's unset the location of the
15985 destructor call instead. */
15986 protected_set_expr_location (cleanup
, UNKNOWN_LOCATION
);
15990 && !lookup_attribute ("warn_unused", TYPE_ATTRIBUTES (TREE_TYPE (decl
)))
15991 /* Treat objects with destructors as used; the destructor may do
15992 something substantive. */
15993 && !mark_used (decl
, complain
) && !(complain
& tf_error
))
15994 return error_mark_node
;
16000 /* Return the FUNCTION_TYPE that corresponds to MEMFNTYPE, which can be a
16001 FUNCTION_DECL, METHOD_TYPE, FUNCTION_TYPE, pointer or reference to
16002 METHOD_TYPE or FUNCTION_TYPE, or pointer to member function. */
16005 static_fn_type (tree memfntype
)
16010 if (TYPE_PTRMEMFUNC_P (memfntype
))
16011 memfntype
= TYPE_PTRMEMFUNC_FN_TYPE (memfntype
);
16012 if (POINTER_TYPE_P (memfntype
)
16013 || TREE_CODE (memfntype
) == FUNCTION_DECL
)
16014 memfntype
= TREE_TYPE (memfntype
);
16015 if (TREE_CODE (memfntype
) == FUNCTION_TYPE
)
16017 gcc_assert (TREE_CODE (memfntype
) == METHOD_TYPE
);
16018 args
= TYPE_ARG_TYPES (memfntype
);
16019 cp_ref_qualifier rqual
= type_memfn_rqual (memfntype
);
16020 fntype
= build_function_type (TREE_TYPE (memfntype
), TREE_CHAIN (args
));
16021 fntype
= apply_memfn_quals (fntype
, type_memfn_quals (memfntype
), rqual
);
16022 fntype
= (cp_build_type_attribute_variant
16023 (fntype
, TYPE_ATTRIBUTES (memfntype
)));
16024 fntype
= (build_exception_variant
16025 (fntype
, TYPE_RAISES_EXCEPTIONS (memfntype
)));
16026 if (TYPE_HAS_LATE_RETURN_TYPE (memfntype
))
16027 TYPE_HAS_LATE_RETURN_TYPE (fntype
) = 1;
16031 /* DECL was originally constructed as a non-static member function,
16032 but turned out to be static. Update it accordingly. */
16035 revert_static_member_fn (tree decl
)
16037 tree stype
= static_fn_type (decl
);
16038 cp_cv_quals quals
= type_memfn_quals (stype
);
16039 cp_ref_qualifier rqual
= type_memfn_rqual (stype
);
16041 if (quals
!= TYPE_UNQUALIFIED
|| rqual
!= REF_QUAL_NONE
)
16042 stype
= apply_memfn_quals (stype
, TYPE_UNQUALIFIED
, REF_QUAL_NONE
);
16044 TREE_TYPE (decl
) = stype
;
16046 if (DECL_ARGUMENTS (decl
))
16047 DECL_ARGUMENTS (decl
) = DECL_CHAIN (DECL_ARGUMENTS (decl
));
16048 DECL_STATIC_FUNCTION_P (decl
) = 1;
16051 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
16052 one of the language-independent trees. */
16054 enum cp_tree_node_structure_enum
16055 cp_tree_node_structure (union lang_tree_node
* t
)
16057 switch (TREE_CODE (&t
->generic
))
16059 case DEFAULT_ARG
: return TS_CP_DEFAULT_ARG
;
16060 case DEFERRED_NOEXCEPT
: return TS_CP_DEFERRED_NOEXCEPT
;
16061 case IDENTIFIER_NODE
: return TS_CP_IDENTIFIER
;
16062 case OVERLOAD
: return TS_CP_OVERLOAD
;
16063 case TEMPLATE_PARM_INDEX
: return TS_CP_TPI
;
16064 case PTRMEM_CST
: return TS_CP_PTRMEM
;
16065 case BASELINK
: return TS_CP_BASELINK
;
16066 case TEMPLATE_DECL
: return TS_CP_TEMPLATE_DECL
;
16067 case STATIC_ASSERT
: return TS_CP_STATIC_ASSERT
;
16068 case ARGUMENT_PACK_SELECT
: return TS_CP_ARGUMENT_PACK_SELECT
;
16069 case TRAIT_EXPR
: return TS_CP_TRAIT_EXPR
;
16070 case LAMBDA_EXPR
: return TS_CP_LAMBDA_EXPR
;
16071 case TEMPLATE_INFO
: return TS_CP_TEMPLATE_INFO
;
16072 case CONSTRAINT_INFO
: return TS_CP_CONSTRAINT_INFO
;
16073 case USERDEF_LITERAL
: return TS_CP_USERDEF_LITERAL
;
16074 default: return TS_CP_GENERIC
;
16078 /* Build the void_list_node (void_type_node having been created). */
16080 build_void_list_node (void)
16082 tree t
= build_tree_list (NULL_TREE
, void_type_node
);
16087 cp_missing_noreturn_ok_p (tree decl
)
16089 /* A missing noreturn is ok for the `main' function. */
16090 return DECL_MAIN_P (decl
);
16093 /* Return the decl used to identify the COMDAT group into which DECL should
16097 cxx_comdat_group (tree decl
)
16099 /* Virtual tables, construction virtual tables, and virtual table
16100 tables all go in a single COMDAT group, named after the primary
16102 if (VAR_P (decl
) && DECL_VTABLE_OR_VTT_P (decl
))
16103 decl
= CLASSTYPE_VTABLES (DECL_CONTEXT (decl
));
16104 /* For all other DECLs, the COMDAT group is the mangled name of the
16105 declaration itself. */
16108 while (DECL_THUNK_P (decl
))
16110 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
16111 into the same section as the target function. In that case
16112 we must return target's name. */
16113 tree target
= THUNK_TARGET (decl
);
16114 if (TARGET_USE_LOCAL_THUNK_ALIAS_P (target
)
16115 && DECL_SECTION_NAME (target
) != NULL
16116 && DECL_ONE_ONLY (target
))
16126 /* Returns the return type for FN as written by the user, which may include
16127 a placeholder for a deduced return type. */
16130 fndecl_declared_return_type (tree fn
)
16132 fn
= STRIP_TEMPLATE (fn
);
16133 if (FNDECL_USED_AUTO (fn
))
16135 struct language_function
*f
= NULL
;
16136 if (DECL_STRUCT_FUNCTION (fn
))
16137 f
= DECL_STRUCT_FUNCTION (fn
)->language
;
16139 f
= DECL_SAVED_FUNCTION_DATA (fn
);
16140 return f
->x_auto_return_pattern
;
16142 return TREE_TYPE (TREE_TYPE (fn
));
16145 /* Returns true iff DECL was declared with an auto type and it has
16146 not yet been deduced to a real type. */
16149 undeduced_auto_decl (tree decl
)
16151 if (cxx_dialect
< cxx11
)
16153 return type_uses_auto (TREE_TYPE (decl
));
16156 /* Complain if DECL has an undeduced return type. */
16159 require_deduced_type (tree decl
, tsubst_flags_t complain
)
16161 if (undeduced_auto_decl (decl
))
16163 if (complain
& tf_error
)
16164 error ("use of %qD before deduction of %<auto%>", decl
);
16170 #include "gt-cp-decl.h"