1 /* Process declarations and variables for C++ compiler.
2 Copyright (C) 1988-2018 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 #include "gcc-rich-location.h"
55 #include "langhooks.h"
57 /* Possible cases of bad specifiers type used by bad_specifiers. */
59 BSP_VAR
, /* variable */
60 BSP_PARM
, /* parameter */
65 static const char *redeclaration_error_message (tree
, tree
);
67 static int decl_jump_unsafe (tree
);
68 static void require_complete_types_for_parms (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
, location_t
);
72 static void 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 tree
local_variable_p_walkfn (tree
*, int *, void *);
77 static const char *tag_name (enum tag_types
);
78 static tree
lookup_and_check_tag (enum tag_types
, tree
, tag_scope
, bool);
79 static void maybe_deduce_size_from_array_init (tree
, tree
);
80 static void layout_var_decl (tree
);
81 static tree
check_initializer (tree
, tree
, int, vec
<tree
, va_gc
> **);
82 static void make_rtl_for_nonlocal_decl (tree
, tree
, const char *);
83 static void save_function_data (tree
);
84 static void copy_type_enum (tree
, tree
);
85 static void check_function_type (tree
, tree
);
86 static void finish_constructor_body (void);
87 static void begin_destructor_body (void);
88 static void finish_destructor_body (void);
89 static void record_key_method_defined (tree
);
90 static tree
create_array_type_for_decl (tree
, tree
, tree
, location_t
);
91 static tree
get_atexit_node (void);
92 static tree
get_dso_handle_node (void);
93 static tree
start_cleanup_fn (void);
94 static void end_cleanup_fn (void);
95 static tree
cp_make_fname_decl (location_t
, tree
, int);
96 static void initialize_predefined_identifiers (void);
97 static tree check_special_function_return_type
98 (special_function_kind
, tree
, tree
, int, const location_t
*);
99 static tree
push_cp_library_fn (enum tree_code
, tree
, int);
100 static tree
build_cp_library_fn (tree
, enum tree_code
, tree
, int);
101 static void store_parm_decls (tree
);
102 static void initialize_local_var (tree
, tree
);
103 static void expand_static_init (tree
, tree
);
105 /* The following symbols are subsumed in the cp_global_trees array, and
106 listed here individually for documentation purposes.
109 tree wchar_decl_node;
111 tree vtable_entry_type;
112 tree delta_type_node;
113 tree __t_desc_type_node;
115 tree class_type_node;
116 tree unknown_type_node;
118 Array type `vtable_entry_type[]'
121 tree vtbl_ptr_type_node;
128 A FUNCTION_DECL which can call `abort'. Not necessarily the
129 one that the user will declare, but sufficient to be called
130 by routines that want to abort the program.
135 tree type_info_type_node, tinfo_decl_id, tinfo_decl_type;
136 tree tinfo_var_id; */
138 tree cp_global_trees
[CPTI_MAX
];
140 /* A list of objects which have constructors or destructors
141 which reside in the global scope. The decl is stored in
142 the TREE_VALUE slot and the initializer is stored
143 in the TREE_PURPOSE slot. */
144 tree static_aggregates
;
146 /* Like static_aggregates, but for thread_local variables. */
151 /* A node for the integer constant 2. */
153 tree integer_two_node
;
155 /* vector of static decls. */
156 vec
<tree
, va_gc
> *static_decls
;
158 /* vector of keyed classes. */
159 vec
<tree
, va_gc
> *keyed_classes
;
161 /* Used only for jumps to as-yet undefined labels, since jumps to
162 defined labels can have their validity checked immediately. */
164 struct GTY((chain_next ("%h.next"))) named_label_use_entry
{
165 struct named_label_use_entry
*next
;
166 /* The binding level to which this entry is *currently* attached.
167 This is initially the binding level in which the goto appeared,
168 but is modified as scopes are closed. */
169 cp_binding_level
*binding_level
;
170 /* The head of the names list that was current when the goto appeared,
171 or the inner scope popped. These are the decls that will *not* be
172 skipped when jumping to the label. */
174 /* The location of the goto, for error reporting. */
175 location_t o_goto_locus
;
176 /* True if an OpenMP structured block scope has been closed since
177 the goto appeared. This means that the branch from the label will
178 illegally exit an OpenMP scope. */
182 /* A list of all LABEL_DECLs in the function that have names. Here so
183 we can clear out their names' definitions at the end of the
184 function, and so we can check the validity of jumps to these labels. */
186 struct GTY((for_user
)) named_label_entry
{
188 tree name
; /* Name of decl. */
190 tree label_decl
; /* LABEL_DECL, unless deleted local label. */
192 named_label_entry
*outer
; /* Outer shadowed chain. */
194 /* The binding level to which the label is *currently* attached.
195 This is initially set to the binding level in which the label
196 is defined, but is modified as scopes are closed. */
197 cp_binding_level
*binding_level
;
199 /* The head of the names list that was current when the label was
200 defined, or the inner scope popped. These are the decls that will
201 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 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 jump to the
213 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 check_label_used (tree label
)
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
);
370 /* Helper function to sort named label entries in a vector by DECL_UID. */
373 sort_labels (const void *a
, const void *b
)
375 tree label1
= *(tree
const *) a
;
376 tree label2
= *(tree
const *) b
;
378 /* DECL_UIDs can never be equal. */
379 return DECL_UID (label1
) > DECL_UID (label2
) ? -1 : +1;
382 /* At the end of a function, all labels declared within the function
383 go out of scope. BLOCK is the top-level block for the
387 pop_labels (tree block
)
392 /* We need to add the labels to the block chain, so debug
393 information is emitted. But, we want the order to be stable so
394 need to sort them first. Otherwise the debug output could be
395 randomly ordered. I guess it's mostly stable, unless the hash
396 table implementation changes. */
397 auto_vec
<tree
, 32> labels (named_labels
->elements ());
398 hash_table
<named_label_hash
>::iterator
end (named_labels
->end ());
399 for (hash_table
<named_label_hash
>::iterator iter
400 (named_labels
->begin ()); iter
!= end
; ++iter
)
402 named_label_entry
*ent
= *iter
;
404 gcc_checking_assert (!ent
->outer
);
406 labels
.quick_push (ent
->label_decl
);
410 labels
.qsort (sort_labels
);
412 while (labels
.length ())
414 tree label
= labels
.pop ();
416 DECL_CHAIN (label
) = BLOCK_VARS (block
);
417 BLOCK_VARS (block
) = label
;
419 check_label_used (label
);
423 /* At the end of a block with local labels, restore the outer definition. */
426 pop_local_label (tree id
, tree label
)
428 check_label_used (label
);
429 named_label_entry
**slot
= named_labels
->find_slot_with_hash
430 (id
, IDENTIFIER_HASH_VALUE (id
), NO_INSERT
);
431 named_label_entry
*ent
= *slot
;
437 ent
= ggc_cleared_alloc
<named_label_entry
> ();
443 /* The following two routines are used to interface to Objective-C++.
444 The binding level is purposely treated as an opaque type. */
447 objc_get_current_scope (void)
449 return current_binding_level
;
452 /* The following routine is used by the NeXT-style SJLJ exceptions;
453 variables get marked 'volatile' so as to not be clobbered by
454 _setjmp()/_longjmp() calls. All variables in the current scope,
455 as well as parent scopes up to (but not including) ENCLOSING_BLK
456 shall be thusly marked. */
459 objc_mark_locals_volatile (void *enclosing_blk
)
461 cp_binding_level
*scope
;
463 for (scope
= current_binding_level
;
464 scope
&& scope
!= enclosing_blk
;
465 scope
= scope
->level_chain
)
469 for (decl
= scope
->names
; decl
; decl
= TREE_CHAIN (decl
))
470 objc_volatilize_decl (decl
);
472 /* Do not climb up past the current function. */
473 if (scope
->kind
== sk_function_parms
)
478 /* True if B is the level for the condition of a constexpr if. */
481 level_for_constexpr_if (cp_binding_level
*b
)
483 return (b
->kind
== sk_cond
&& b
->this_entity
484 && TREE_CODE (b
->this_entity
) == IF_STMT
485 && IF_STMT_CONSTEXPR_P (b
->this_entity
));
488 /* Update data for defined and undefined labels when leaving a scope. */
491 poplevel_named_label_1 (named_label_entry
**slot
, cp_binding_level
*bl
)
493 named_label_entry
*ent
= *slot
;
494 cp_binding_level
*obl
= bl
->level_chain
;
496 if (ent
->binding_level
== bl
)
500 /* ENT->NAMES_IN_SCOPE may contain a mixture of DECLs and
501 TREE_LISTs representing OVERLOADs, so be careful. */
502 for (decl
= ent
->names_in_scope
; decl
; decl
= (DECL_P (decl
)
504 : TREE_CHAIN (decl
)))
505 if (decl_jump_unsafe (decl
))
506 vec_safe_push (ent
->bad_decls
, decl
);
508 ent
->binding_level
= obl
;
509 ent
->names_in_scope
= obl
->names
;
513 ent
->in_try_scope
= true;
516 ent
->in_catch_scope
= true;
519 ent
->in_omp_scope
= true;
522 ent
->in_transaction_scope
= true;
525 if (level_for_constexpr_if (bl
->level_chain
))
526 ent
->in_constexpr_if
= true;
534 struct named_label_use_entry
*use
;
536 for (use
= ent
->uses
; use
; use
= use
->next
)
537 if (use
->binding_level
== bl
)
539 use
->binding_level
= obl
;
540 use
->names_in_scope
= obl
->names
;
541 if (bl
->kind
== sk_omp
)
542 use
->in_omp_scope
= true;
549 /* Saved errorcount to avoid -Wunused-but-set-{parameter,variable} warnings
550 when errors were reported, except for -Werror-unused-but-set-*. */
551 static int unused_but_set_errorcount
;
553 /* Exit a binding level.
554 Pop the level off, and restore the state of the identifier-decl mappings
555 that were in effect when this level was entered.
557 If KEEP == 1, this level had explicit declarations, so
558 and create a "block" (a BLOCK node) for the level
559 to record its declarations and subblocks for symbol table output.
561 If FUNCTIONBODY is nonzero, this level is the body of a function,
562 so create a block as if KEEP were set and also clear out all
565 If REVERSE is nonzero, reverse the order of decls before putting
566 them into the BLOCK. */
569 poplevel (int keep
, int reverse
, int functionbody
)
572 /* The chain of decls was accumulated in reverse order.
573 Put it into forward order, just for cleanliness. */
580 bool subtime
= timevar_cond_start (TV_NAME_LOOKUP
);
585 gcc_assert (current_binding_level
->kind
!= sk_class
586 && current_binding_level
->kind
!= sk_namespace
);
588 if (current_binding_level
->kind
== sk_cleanup
)
590 subblocks
= functionbody
>= 0 ? current_binding_level
->blocks
: 0;
592 gcc_assert (!vec_safe_length (current_binding_level
->class_shadowed
));
594 /* We used to use KEEP == 2 to indicate that the new block should go
595 at the beginning of the list of blocks at this binding level,
596 rather than the end. This hack is no longer used. */
597 gcc_assert (keep
== 0 || keep
== 1);
599 if (current_binding_level
->keep
)
602 /* Any uses of undefined labels, and any defined labels, now operate
603 under constraints of next binding contour. */
604 if (cfun
&& !functionbody
&& named_labels
)
605 named_labels
->traverse
<cp_binding_level
*, poplevel_named_label_1
>
606 (current_binding_level
);
608 /* Get the decls in the order they were written.
609 Usually current_binding_level->names is in reverse order.
610 But parameter decls were previously put in forward order. */
612 decls
= current_binding_level
->names
;
615 decls
= nreverse (decls
);
616 current_binding_level
->names
= decls
;
619 /* If there were any declarations or structure tags in that level,
620 or if this level is a function body,
621 create a BLOCK to record them for the life of this function. */
623 /* Avoid function body block if possible. */
624 if (functionbody
&& subblocks
&& BLOCK_CHAIN (subblocks
) == NULL_TREE
)
626 else if (keep
== 1 || functionbody
)
627 block
= make_node (BLOCK
);
628 if (block
!= NULL_TREE
)
630 BLOCK_VARS (block
) = decls
;
631 BLOCK_SUBBLOCKS (block
) = subblocks
;
634 /* In each subblock, record that this is its superior. */
636 for (link
= subblocks
; link
; link
= BLOCK_CHAIN (link
))
637 BLOCK_SUPERCONTEXT (link
) = block
;
639 /* Before we remove the declarations first check for unused variables. */
640 if ((warn_unused_variable
|| warn_unused_but_set_variable
)
641 && current_binding_level
->kind
!= sk_template_parms
642 && !processing_template_decl
)
643 for (tree d
= get_local_decls (); d
; d
= TREE_CHAIN (d
))
645 /* There are cases where D itself is a TREE_LIST. See in
646 push_local_binding where the list of decls returned by
647 getdecls is built. */
648 decl
= TREE_CODE (d
) == TREE_LIST
? TREE_VALUE (d
) : d
;
650 tree type
= TREE_TYPE (decl
);
652 && (! TREE_USED (decl
) || !DECL_READ_P (decl
))
653 && ! DECL_IN_SYSTEM_HEADER (decl
)
654 /* For structured bindings, consider only real variables, not
656 && (DECL_DECOMPOSITION_P (decl
) ? !DECL_DECOMP_BASE (decl
)
657 : (DECL_NAME (decl
) && !DECL_ARTIFICIAL (decl
)))
658 && type
!= error_mark_node
659 && (!CLASS_TYPE_P (type
)
660 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type
)
661 || lookup_attribute ("warn_unused",
662 TYPE_ATTRIBUTES (TREE_TYPE (decl
)))))
664 if (! TREE_USED (decl
))
666 if (!DECL_NAME (decl
) && DECL_DECOMPOSITION_P (decl
))
667 warning_at (DECL_SOURCE_LOCATION (decl
),
668 OPT_Wunused_variable
,
669 "unused structured binding declaration");
671 warning_at (DECL_SOURCE_LOCATION (decl
),
672 OPT_Wunused_variable
, "unused variable %qD", decl
);
674 else if (DECL_CONTEXT (decl
) == current_function_decl
675 // For -Wunused-but-set-variable leave references alone.
676 && !TYPE_REF_P (TREE_TYPE (decl
))
677 && errorcount
== unused_but_set_errorcount
)
679 if (!DECL_NAME (decl
) && DECL_DECOMPOSITION_P (decl
))
680 warning_at (DECL_SOURCE_LOCATION (decl
),
681 OPT_Wunused_but_set_variable
, "structured "
682 "binding declaration set but not used");
684 warning_at (DECL_SOURCE_LOCATION (decl
),
685 OPT_Wunused_but_set_variable
,
686 "variable %qD set but not used", decl
);
687 unused_but_set_errorcount
= errorcount
;
692 /* Remove declarations for all the DECLs in this level. */
693 for (link
= decls
; link
; link
= TREE_CHAIN (link
))
695 decl
= TREE_CODE (link
) == TREE_LIST
? TREE_VALUE (link
) : link
;
696 tree name
= OVL_NAME (decl
);
698 /* Remove the binding. */
699 if (TREE_CODE (decl
) == LABEL_DECL
)
700 pop_local_label (name
, decl
);
702 pop_local_binding (name
, decl
);
705 /* Restore the IDENTIFIER_TYPE_VALUEs. */
706 for (link
= current_binding_level
->type_shadowed
;
707 link
; link
= TREE_CHAIN (link
))
708 SET_IDENTIFIER_TYPE_VALUE (TREE_PURPOSE (link
), TREE_VALUE (link
));
710 /* There may be OVERLOADs (wrapped in TREE_LISTs) on the BLOCK_VARs
711 list if a `using' declaration put them there. The debugging
712 back ends won't understand OVERLOAD, so we remove them here.
713 Because the BLOCK_VARS are (temporarily) shared with
714 CURRENT_BINDING_LEVEL->NAMES we must do this fixup after we have
715 popped all the bindings. Also remove undeduced 'auto' decls,
716 which LTO doesn't understand, and can't have been used by anything. */
721 for (d
= &BLOCK_VARS (block
); *d
; )
723 if (TREE_CODE (*d
) == TREE_LIST
724 || (!processing_template_decl
725 && undeduced_auto_decl (*d
)))
726 *d
= TREE_CHAIN (*d
);
728 d
= &DECL_CHAIN (*d
);
732 /* If the level being exited is the top level of a function,
733 check over all the labels. */
738 /* Since this is the top level block of a function, the vars are
739 the function's parameters. Don't leave them in the BLOCK
740 because they are found in the FUNCTION_DECL instead. */
741 BLOCK_VARS (block
) = 0;
745 pop_labels (subblocks
);
748 kind
= current_binding_level
->kind
;
749 if (kind
== sk_cleanup
)
753 /* If this is a temporary binding created for a cleanup, then we'll
754 have pushed a statement list level. Pop that, create a new
755 BIND_EXPR for the block, and insert it into the stream. */
756 stmt
= pop_stmt_list (current_binding_level
->statement_list
);
757 stmt
= c_build_bind_expr (input_location
, block
, stmt
);
764 /* The current function is being defined, so its DECL_INITIAL
765 should be error_mark_node. */
766 gcc_assert (DECL_INITIAL (current_function_decl
) == error_mark_node
);
767 DECL_INITIAL (current_function_decl
) = block
? block
: subblocks
;
770 if (FUNCTION_NEEDS_BODY_BLOCK (current_function_decl
))
772 if (BLOCK_SUBBLOCKS (subblocks
))
773 BLOCK_OUTER_CURLY_BRACE_P (BLOCK_SUBBLOCKS (subblocks
)) = 1;
776 BLOCK_OUTER_CURLY_BRACE_P (subblocks
) = 1;
780 current_binding_level
->blocks
781 = block_chainon (current_binding_level
->blocks
, block
);
783 /* If we did not make a block for the level just exited,
784 any blocks made for inner levels
785 (since they cannot be recorded as subblocks in that level)
786 must be carried forward so they will later become subblocks
787 of something else. */
789 current_binding_level
->blocks
790 = block_chainon (current_binding_level
->blocks
, subblocks
);
792 /* Each and every BLOCK node created here in `poplevel' is important
793 (e.g. for proper debugging information) so if we created one
794 earlier, mark it as "used". */
796 TREE_USED (block
) = 1;
798 /* All temporary bindings created for cleanups are popped silently. */
799 if (kind
== sk_cleanup
)
802 timevar_cond_stop (TV_NAME_LOOKUP
, subtime
);
806 /* Call wrapup_globals_declarations for the globals in NAMESPACE. */
807 /* Diagnose odr-used extern inline variables without definitions
808 in the current TU. */
811 wrapup_namespace_globals ()
813 if (vec
<tree
, va_gc
> *statics
= static_decls
)
817 FOR_EACH_VEC_ELT (*statics
, i
, decl
)
819 if (warn_unused_function
820 && TREE_CODE (decl
) == FUNCTION_DECL
821 && DECL_INITIAL (decl
) == 0
822 && DECL_EXTERNAL (decl
)
823 && !TREE_PUBLIC (decl
)
824 && !DECL_ARTIFICIAL (decl
)
825 && !DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl
)
826 && !TREE_NO_WARNING (decl
))
827 warning_at (DECL_SOURCE_LOCATION (decl
),
828 OPT_Wunused_function
,
829 "%qF declared %<static%> but never defined", decl
);
832 && DECL_EXTERNAL (decl
)
833 && DECL_INLINE_VAR_P (decl
)
834 && DECL_ODR_USED (decl
))
835 error_at (DECL_SOURCE_LOCATION (decl
),
836 "odr-used inline variable %qD is not defined", decl
);
839 /* Clear out the list, so we don't rescan next time. */
842 /* Write out any globals that need to be output. */
843 return wrapup_global_declarations (statics
->address (),
849 /* In C++, you don't have to write `struct S' to refer to `S'; you
850 can just use `S'. We accomplish this by creating a TYPE_DECL as
851 if the user had written `typedef struct S S'. Create and return
852 the TYPE_DECL for TYPE. */
855 create_implicit_typedef (tree name
, tree type
)
859 decl
= build_decl (input_location
, TYPE_DECL
, name
, type
);
860 DECL_ARTIFICIAL (decl
) = 1;
861 /* There are other implicit type declarations, like the one *within*
862 a class that allows you to write `S::S'. We must distinguish
864 SET_DECL_IMPLICIT_TYPEDEF_P (decl
);
865 TYPE_NAME (type
) = decl
;
866 TYPE_STUB_DECL (type
) = decl
;
871 /* Function-scope local entities that need discriminators. Each entry
872 is a {decl,name} pair. VAR_DECLs for anon unions get their name
873 smashed, so we cannot rely on DECL_NAME. */
875 static GTY((deletable
)) vec
<tree
, va_gc
> *local_entities
;
877 /* Determine the mangling discriminator of local DECL. There are
878 generally very few of these in any particular function. */
881 determine_local_discriminator (tree decl
)
883 bool subtime
= timevar_cond_start (TV_NAME_LOOKUP
);
884 retrofit_lang_decl (decl
);
885 tree ctx
= DECL_CONTEXT (decl
);
886 tree name
= (TREE_CODE (decl
) == TYPE_DECL
887 && TYPE_UNNAMED_P (TREE_TYPE (decl
))
888 ? NULL_TREE
: DECL_NAME (decl
));
889 size_t nelts
= vec_safe_length (local_entities
);
890 for (size_t i
= 0; i
< nelts
; i
+= 2)
892 tree
*pair
= &(*local_entities
)[i
];
895 gcc_checking_assert (d
!= decl
);
897 && TREE_CODE (decl
) == TREE_CODE (d
)
898 && ctx
== DECL_CONTEXT (d
))
900 tree disc
= integer_one_node
;
901 if (DECL_DISCRIMINATOR (d
))
902 disc
= build_int_cst (TREE_TYPE (disc
),
903 TREE_INT_CST_LOW (DECL_DISCRIMINATOR (d
)) + 1);
904 DECL_DISCRIMINATOR (decl
) = disc
;
905 /* Replace the saved decl. */
914 vec_safe_reserve (local_entities
, 2);
915 local_entities
->quick_push (decl
);
916 local_entities
->quick_push (name
);
919 timevar_cond_stop (TV_NAME_LOOKUP
, subtime
);
923 /* Subroutine of duplicate_decls: return truthvalue of whether
924 or not types of these decls match.
926 For C++, we must compare the parameter list so that `int' can match
927 `int&' in a parameter position, but `int&' is not confused with
931 decls_match (tree newdecl
, tree olddecl
, bool record_versions
/* = true */)
935 if (newdecl
== olddecl
)
938 if (TREE_CODE (newdecl
) != TREE_CODE (olddecl
))
939 /* If the two DECLs are not even the same kind of thing, we're not
940 interested in their types. */
943 gcc_assert (DECL_P (newdecl
));
945 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
947 tree f1
= TREE_TYPE (newdecl
);
948 tree f2
= TREE_TYPE (olddecl
);
949 tree p1
= TYPE_ARG_TYPES (f1
);
950 tree p2
= TYPE_ARG_TYPES (f2
);
953 /* Specializations of different templates are different functions
954 even if they have the same type. */
955 tree t1
= (DECL_USE_TEMPLATE (newdecl
)
956 ? DECL_TI_TEMPLATE (newdecl
)
958 tree t2
= (DECL_USE_TEMPLATE (olddecl
)
959 ? DECL_TI_TEMPLATE (olddecl
)
964 if (CP_DECL_CONTEXT (newdecl
) != CP_DECL_CONTEXT (olddecl
)
965 && ! (DECL_EXTERN_C_P (newdecl
)
966 && DECL_EXTERN_C_P (olddecl
)))
969 /* A new declaration doesn't match a built-in one unless it
970 is also extern "C". */
971 if (DECL_IS_BUILTIN (olddecl
)
972 && DECL_EXTERN_C_P (olddecl
) && !DECL_EXTERN_C_P (newdecl
))
975 if (TREE_CODE (f1
) != TREE_CODE (f2
))
978 /* A declaration with deduced return type should use its pre-deduction
979 type for declaration matching. */
980 r2
= fndecl_declared_return_type (olddecl
);
982 if (same_type_p (TREE_TYPE (f1
), r2
))
984 if (!prototype_p (f2
) && DECL_EXTERN_C_P (olddecl
)
985 && fndecl_built_in_p (olddecl
))
987 types_match
= self_promoting_args_p (p1
);
988 if (p1
== void_list_node
)
989 TREE_TYPE (newdecl
) = TREE_TYPE (olddecl
);
994 && type_memfn_rqual (f1
) == type_memfn_rqual (f2
)
995 && (TYPE_ATTRIBUTES (TREE_TYPE (newdecl
)) == NULL_TREE
996 || comp_type_attributes (TREE_TYPE (newdecl
),
997 TREE_TYPE (olddecl
)) != 0);
1002 /* The decls dont match if they correspond to two different versions
1003 of the same function. Disallow extern "C" functions to be
1004 versions for now. */
1006 && !DECL_EXTERN_C_P (newdecl
)
1007 && !DECL_EXTERN_C_P (olddecl
)
1009 && maybe_version_functions (newdecl
, olddecl
,
1010 (!DECL_FUNCTION_VERSIONED (newdecl
)
1011 || !DECL_FUNCTION_VERSIONED (olddecl
))))
1014 else if (TREE_CODE (newdecl
) == TEMPLATE_DECL
)
1016 tree oldres
= DECL_TEMPLATE_RESULT (olddecl
);
1017 tree newres
= DECL_TEMPLATE_RESULT (newdecl
);
1019 if (TREE_CODE (newres
) != TREE_CODE (oldres
))
1022 if (!comp_template_parms (DECL_TEMPLATE_PARMS (newdecl
),
1023 DECL_TEMPLATE_PARMS (olddecl
)))
1026 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl
)) == TYPE_DECL
)
1027 types_match
= (same_type_p (TREE_TYPE (oldres
), TREE_TYPE (newres
))
1028 && equivalently_constrained (olddecl
, newdecl
));
1030 // We don't need to check equivalently_constrained for variable and
1031 // function templates because we check it on the results.
1032 types_match
= decls_match (oldres
, newres
);
1036 /* Need to check scope for variable declaration (VAR_DECL).
1037 For typedef (TYPE_DECL), scope is ignored. */
1039 && CP_DECL_CONTEXT (newdecl
) != CP_DECL_CONTEXT (olddecl
)
1041 Two declarations for an object with C language linkage
1042 with the same name (ignoring the namespace that qualify
1043 it) that appear in different namespace scopes refer to
1045 && !(DECL_EXTERN_C_P (olddecl
) && DECL_EXTERN_C_P (newdecl
)))
1048 if (TREE_TYPE (newdecl
) == error_mark_node
)
1049 types_match
= TREE_TYPE (olddecl
) == error_mark_node
;
1050 else if (TREE_TYPE (olddecl
) == NULL_TREE
)
1051 types_match
= TREE_TYPE (newdecl
) == NULL_TREE
;
1052 else if (TREE_TYPE (newdecl
) == NULL_TREE
)
1055 types_match
= comptypes (TREE_TYPE (newdecl
),
1056 TREE_TYPE (olddecl
),
1057 COMPARE_REDECLARATION
);
1060 // Normal functions can be constrained, as can variable partial
1062 if (types_match
&& VAR_OR_FUNCTION_DECL_P (newdecl
))
1063 types_match
= equivalently_constrained (newdecl
, olddecl
);
1068 /* NEWDECL and OLDDECL have identical signatures. If they are
1069 different versions adjust them and return true.
1070 If RECORD is set to true, record function versions. */
1073 maybe_version_functions (tree newdecl
, tree olddecl
, bool record
)
1075 if (!targetm
.target_option
.function_versions (newdecl
, olddecl
))
1078 if (!DECL_FUNCTION_VERSIONED (olddecl
))
1080 DECL_FUNCTION_VERSIONED (olddecl
) = 1;
1081 if (DECL_ASSEMBLER_NAME_SET_P (olddecl
))
1082 mangle_decl (olddecl
);
1085 if (!DECL_FUNCTION_VERSIONED (newdecl
))
1087 DECL_FUNCTION_VERSIONED (newdecl
) = 1;
1088 if (DECL_ASSEMBLER_NAME_SET_P (newdecl
))
1089 mangle_decl (newdecl
);
1093 cgraph_node::record_function_versions (olddecl
, newdecl
);
1098 /* If NEWDECL is `static' and an `extern' was seen previously,
1099 warn about it. OLDDECL is the previous declaration.
1101 Note that this does not apply to the C++ case of declaring
1102 a variable `extern const' and then later `const'.
1104 Don't complain about built-in functions, since they are beyond
1105 the user's control. */
1108 warn_extern_redeclared_static (tree newdecl
, tree olddecl
)
1110 if (TREE_CODE (newdecl
) == TYPE_DECL
1111 || TREE_CODE (newdecl
) == TEMPLATE_DECL
1112 || TREE_CODE (newdecl
) == CONST_DECL
1113 || TREE_CODE (newdecl
) == NAMESPACE_DECL
)
1116 /* Don't get confused by static member functions; that's a different
1118 if (TREE_CODE (newdecl
) == FUNCTION_DECL
1119 && DECL_STATIC_FUNCTION_P (newdecl
))
1122 /* If the old declaration was `static', or the new one isn't, then
1123 everything is OK. */
1124 if (DECL_THIS_STATIC (olddecl
) || !DECL_THIS_STATIC (newdecl
))
1127 /* It's OK to declare a builtin function as `static'. */
1128 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1129 && DECL_ARTIFICIAL (olddecl
))
1132 auto_diagnostic_group d
;
1133 if (permerror (DECL_SOURCE_LOCATION (newdecl
),
1134 "%qD was declared %<extern%> and later %<static%>", newdecl
))
1135 inform (DECL_SOURCE_LOCATION (olddecl
),
1136 "previous declaration of %qD", olddecl
);
1139 /* NEW_DECL is a redeclaration of OLD_DECL; both are functions or
1140 function templates. If their exception specifications do not
1141 match, issue a diagnostic. */
1144 check_redeclaration_exception_specification (tree new_decl
,
1147 tree new_exceptions
= TYPE_RAISES_EXCEPTIONS (TREE_TYPE (new_decl
));
1148 tree old_exceptions
= TYPE_RAISES_EXCEPTIONS (TREE_TYPE (old_decl
));
1150 /* Two default specs are equivalent, don't force evaluation. */
1151 if (UNEVALUATED_NOEXCEPT_SPEC_P (new_exceptions
)
1152 && UNEVALUATED_NOEXCEPT_SPEC_P (old_exceptions
))
1155 if (!type_dependent_expression_p (old_decl
))
1157 maybe_instantiate_noexcept (new_decl
);
1158 maybe_instantiate_noexcept (old_decl
);
1160 new_exceptions
= TYPE_RAISES_EXCEPTIONS (TREE_TYPE (new_decl
));
1161 old_exceptions
= TYPE_RAISES_EXCEPTIONS (TREE_TYPE (old_decl
));
1165 If any declaration of a function has an exception-specification,
1166 all declarations, including the definition and an explicit
1167 specialization, of that function shall have an
1168 exception-specification with the same set of type-ids. */
1169 if (! DECL_IS_BUILTIN (old_decl
)
1170 && !comp_except_specs (new_exceptions
, old_exceptions
, ce_normal
))
1172 const char *const msg
1173 = G_("declaration of %qF has a different exception specifier");
1174 bool complained
= true;
1175 location_t new_loc
= DECL_SOURCE_LOCATION (new_decl
);
1176 auto_diagnostic_group d
;
1177 if (DECL_IN_SYSTEM_HEADER (old_decl
))
1178 complained
= pedwarn (new_loc
, OPT_Wsystem_headers
, msg
, new_decl
);
1179 else if (!flag_exceptions
)
1180 /* We used to silently permit mismatched eh specs with
1181 -fno-exceptions, so make them a pedwarn now. */
1182 complained
= pedwarn (new_loc
, OPT_Wpedantic
, msg
, new_decl
);
1184 error_at (new_loc
, msg
, new_decl
);
1186 inform (DECL_SOURCE_LOCATION (old_decl
),
1187 "from previous declaration %qF", old_decl
);
1191 /* Return true if OLD_DECL and NEW_DECL agree on constexprness.
1192 Otherwise issue diagnostics. */
1195 validate_constexpr_redeclaration (tree old_decl
, tree new_decl
)
1197 old_decl
= STRIP_TEMPLATE (old_decl
);
1198 new_decl
= STRIP_TEMPLATE (new_decl
);
1199 if (!VAR_OR_FUNCTION_DECL_P (old_decl
)
1200 || !VAR_OR_FUNCTION_DECL_P (new_decl
))
1202 if (DECL_DECLARED_CONSTEXPR_P (old_decl
)
1203 == DECL_DECLARED_CONSTEXPR_P (new_decl
))
1205 if (TREE_CODE (old_decl
) == FUNCTION_DECL
)
1207 if (fndecl_built_in_p (old_decl
))
1209 /* Hide a built-in declaration. */
1210 DECL_DECLARED_CONSTEXPR_P (old_decl
)
1211 = DECL_DECLARED_CONSTEXPR_P (new_decl
);
1214 /* 7.1.5 [dcl.constexpr]
1215 Note: An explicit specialization can differ from the template
1216 declaration with respect to the constexpr specifier. */
1217 if (! DECL_TEMPLATE_SPECIALIZATION (old_decl
)
1218 && DECL_TEMPLATE_SPECIALIZATION (new_decl
))
1221 error_at (DECL_SOURCE_LOCATION (new_decl
),
1222 "redeclaration %qD differs in %<constexpr%> "
1223 "from previous declaration", new_decl
);
1224 inform (DECL_SOURCE_LOCATION (old_decl
),
1225 "previous declaration %qD", old_decl
);
1231 // If OLDDECL and NEWDECL are concept declarations with the same type
1232 // (i.e., and template parameters), but different requirements,
1233 // emit diagnostics and return true. Otherwise, return false.
1235 check_concept_refinement (tree olddecl
, tree newdecl
)
1237 if (!DECL_DECLARED_CONCEPT_P (olddecl
) || !DECL_DECLARED_CONCEPT_P (newdecl
))
1240 tree d1
= DECL_TEMPLATE_RESULT (olddecl
);
1241 tree d2
= DECL_TEMPLATE_RESULT (newdecl
);
1242 if (TREE_CODE (d1
) != TREE_CODE (d2
))
1245 tree t1
= TREE_TYPE (d1
);
1246 tree t2
= TREE_TYPE (d2
);
1247 if (TREE_CODE (d1
) == FUNCTION_DECL
)
1249 if (compparms (TYPE_ARG_TYPES (t1
), TYPE_ARG_TYPES (t2
))
1250 && comp_template_parms (DECL_TEMPLATE_PARMS (olddecl
),
1251 DECL_TEMPLATE_PARMS (newdecl
))
1252 && !equivalently_constrained (olddecl
, newdecl
))
1254 error ("cannot specialize concept %q#D", olddecl
);
1261 /* DECL is a redeclaration of a function or function template. If
1262 it does have default arguments issue a diagnostic. Note: this
1263 function is used to enforce the requirements in C++11 8.3.6 about
1264 no default arguments in redeclarations. */
1267 check_redeclaration_no_default_args (tree decl
)
1269 gcc_assert (DECL_DECLARES_FUNCTION_P (decl
));
1271 for (tree t
= FUNCTION_FIRST_USER_PARMTYPE (decl
);
1272 t
&& t
!= void_list_node
; t
= TREE_CHAIN (t
))
1273 if (TREE_PURPOSE (t
))
1275 permerror (DECL_SOURCE_LOCATION (decl
),
1276 "redeclaration of %q#D may not have default "
1282 /* NEWDECL is a redeclaration of a function or function template OLDDECL,
1283 in any case represented as FUNCTION_DECLs (the DECL_TEMPLATE_RESULTs of
1284 the TEMPLATE_DECLs in case of function templates). This function is used
1285 to enforce the final part of C++17 11.3.6/4, about a single declaration:
1286 "If a friend declaration specifies a default argument expression, that
1287 declaration shall be a definition and shall be the only declaration of
1288 the function or function template in the translation unit." */
1291 check_no_redeclaration_friend_default_args (tree olddecl
, tree newdecl
,
1292 bool olddecl_hidden_friend_p
)
1294 if (!olddecl_hidden_friend_p
&& !DECL_FRIEND_P (newdecl
))
1297 tree t1
= FUNCTION_FIRST_USER_PARMTYPE (olddecl
);
1298 tree t2
= FUNCTION_FIRST_USER_PARMTYPE (newdecl
);
1300 for (; t1
&& t1
!= void_list_node
;
1301 t1
= TREE_CHAIN (t1
), t2
= TREE_CHAIN (t2
))
1302 if ((olddecl_hidden_friend_p
&& TREE_PURPOSE (t1
))
1303 || (DECL_FRIEND_P (newdecl
) && TREE_PURPOSE (t2
)))
1305 auto_diagnostic_group d
;
1306 if (permerror (DECL_SOURCE_LOCATION (newdecl
),
1307 "friend declaration of %q#D specifies default "
1308 "arguments and isn't the only declaration", newdecl
))
1309 inform (DECL_SOURCE_LOCATION (olddecl
),
1310 "previous declaration of %q#D", olddecl
);
1315 /* Merge tree bits that correspond to attributes noreturn, nothrow,
1316 const, malloc, and pure from NEWDECL with those of OLDDECL. */
1319 merge_attribute_bits (tree newdecl
, tree olddecl
)
1321 TREE_THIS_VOLATILE (newdecl
) |= TREE_THIS_VOLATILE (olddecl
);
1322 TREE_THIS_VOLATILE (olddecl
) |= TREE_THIS_VOLATILE (newdecl
);
1323 TREE_NOTHROW (newdecl
) |= TREE_NOTHROW (olddecl
);
1324 TREE_NOTHROW (olddecl
) |= TREE_NOTHROW (newdecl
);
1325 TREE_READONLY (newdecl
) |= TREE_READONLY (olddecl
);
1326 TREE_READONLY (olddecl
) |= TREE_READONLY (newdecl
);
1327 DECL_IS_MALLOC (newdecl
) |= DECL_IS_MALLOC (olddecl
);
1328 DECL_IS_MALLOC (olddecl
) |= DECL_IS_MALLOC (newdecl
);
1329 DECL_PURE_P (newdecl
) |= DECL_PURE_P (olddecl
);
1330 DECL_PURE_P (olddecl
) |= DECL_PURE_P (newdecl
);
1331 DECL_UNINLINABLE (newdecl
) |= DECL_UNINLINABLE (olddecl
);
1332 DECL_UNINLINABLE (olddecl
) |= DECL_UNINLINABLE (newdecl
);
1335 #define GNU_INLINE_P(fn) (DECL_DECLARED_INLINE_P (fn) \
1336 && lookup_attribute ("gnu_inline", \
1337 DECL_ATTRIBUTES (fn)))
1339 /* If NEWDECL is a redeclaration of OLDDECL, merge the declarations.
1340 If the redeclaration is invalid, a diagnostic is issued, and the
1341 error_mark_node is returned. Otherwise, OLDDECL is returned.
1343 If NEWDECL is not a redeclaration of OLDDECL, NULL_TREE is
1346 NEWDECL_IS_FRIEND is true if NEWDECL was declared as a friend. */
1349 duplicate_decls (tree newdecl
, tree olddecl
, bool newdecl_is_friend
)
1351 unsigned olddecl_uid
= DECL_UID (olddecl
);
1352 int olddecl_friend
= 0, types_match
= 0, hidden_friend
= 0;
1353 int olddecl_hidden_friend
= 0;
1354 int new_defines_function
= 0;
1355 tree new_template_info
;
1356 location_t olddecl_loc
= DECL_SOURCE_LOCATION (olddecl
);
1357 location_t newdecl_loc
= DECL_SOURCE_LOCATION (newdecl
);
1359 if (newdecl
== olddecl
)
1362 types_match
= decls_match (newdecl
, olddecl
);
1364 /* If either the type of the new decl or the type of the old decl is an
1365 error_mark_node, then that implies that we have already issued an
1366 error (earlier) for some bogus type specification, and in that case,
1367 it is rather pointless to harass the user with yet more error message
1368 about the same declaration, so just pretend the types match here. */
1369 if (TREE_TYPE (newdecl
) == error_mark_node
1370 || TREE_TYPE (olddecl
) == error_mark_node
)
1371 return error_mark_node
;
1373 /* Check for redeclaration and other discrepancies. */
1374 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1375 && DECL_ARTIFICIAL (olddecl
))
1377 gcc_assert (!DECL_HIDDEN_FRIEND_P (olddecl
));
1378 if (TREE_CODE (newdecl
) != FUNCTION_DECL
)
1380 /* Avoid warnings redeclaring built-ins which have not been
1381 explicitly declared. */
1382 if (DECL_ANTICIPATED (olddecl
))
1384 if (TREE_PUBLIC (newdecl
)
1385 && CP_DECL_CONTEXT (newdecl
) == global_namespace
)
1386 warning_at (newdecl_loc
,
1387 OPT_Wbuiltin_declaration_mismatch
,
1388 "built-in function %qD declared as non-function",
1393 /* If you declare a built-in or predefined function name as static,
1394 the old definition is overridden, but optionally warn this was a
1395 bad choice of name. */
1396 if (! TREE_PUBLIC (newdecl
))
1398 warning_at (newdecl_loc
,
1400 fndecl_built_in_p (olddecl
)
1401 ? G_("shadowing built-in function %q#D")
1402 : G_("shadowing library function %q#D"), olddecl
);
1403 /* Discard the old built-in function. */
1406 /* If the built-in is not ansi, then programs can override
1407 it even globally without an error. */
1408 else if (! fndecl_built_in_p (olddecl
))
1409 warning_at (newdecl_loc
, 0,
1410 "library function %q#D redeclared as non-function %q#D",
1413 error_at (newdecl_loc
,
1414 "declaration of %q#D conflicts with built-in "
1415 "declaration %q#D", newdecl
, olddecl
);
1418 else if (DECL_OMP_DECLARE_REDUCTION_P (olddecl
))
1420 gcc_assert (DECL_OMP_DECLARE_REDUCTION_P (newdecl
));
1421 error_at (newdecl_loc
,
1422 "redeclaration of %<pragma omp declare reduction%>");
1423 inform (olddecl_loc
,
1424 "previous %<pragma omp declare reduction%> declaration");
1425 return error_mark_node
;
1427 else if (!types_match
)
1429 /* Avoid warnings redeclaring built-ins which have not been
1430 explicitly declared. */
1431 if (DECL_ANTICIPATED (olddecl
))
1435 /* A new declaration doesn't match a built-in one unless it
1436 is also extern "C". */
1437 gcc_assert (DECL_IS_BUILTIN (olddecl
));
1438 gcc_assert (DECL_EXTERN_C_P (olddecl
));
1439 if (!DECL_EXTERN_C_P (newdecl
))
1442 for (t1
= TYPE_ARG_TYPES (TREE_TYPE (newdecl
)),
1443 t2
= TYPE_ARG_TYPES (TREE_TYPE (olddecl
));
1445 t1
= TREE_CHAIN (t1
), t2
= TREE_CHAIN (t2
))
1449 /* FILE, tm types are not known at the time
1450 we create the builtins. */
1451 for (unsigned i
= 0;
1452 i
< sizeof (builtin_structptr_types
)
1453 / sizeof (builtin_structptr_type
);
1455 if (TREE_VALUE (t2
) == builtin_structptr_types
[i
].node
)
1457 tree t
= TREE_VALUE (t1
);
1460 && TYPE_IDENTIFIER (TREE_TYPE (t
))
1461 == get_identifier (builtin_structptr_types
[i
].str
)
1462 && compparms (TREE_CHAIN (t1
), TREE_CHAIN (t2
)))
1464 tree oldargs
= TYPE_ARG_TYPES (TREE_TYPE (olddecl
));
1466 TYPE_ARG_TYPES (TREE_TYPE (olddecl
))
1467 = TYPE_ARG_TYPES (TREE_TYPE (newdecl
));
1468 types_match
= decls_match (newdecl
, olddecl
);
1470 return duplicate_decls (newdecl
, olddecl
,
1472 TYPE_ARG_TYPES (TREE_TYPE (olddecl
)) = oldargs
;
1477 if (! same_type_p (TREE_VALUE (t1
), TREE_VALUE (t2
)))
1482 warning_at (newdecl_loc
,
1483 OPT_Wbuiltin_declaration_mismatch
,
1484 "declaration of %q#D conflicts with built-in "
1485 "declaration %q#D", newdecl
, olddecl
);
1487 else if ((DECL_EXTERN_C_P (newdecl
)
1488 && DECL_EXTERN_C_P (olddecl
))
1489 || compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl
)),
1490 TYPE_ARG_TYPES (TREE_TYPE (olddecl
))))
1492 /* Don't really override olddecl for __* prefixed builtins
1493 except for __[^b]*_chk, the compiler might be using those
1495 if (fndecl_built_in_p (olddecl
))
1497 tree id
= DECL_NAME (olddecl
);
1498 const char *name
= IDENTIFIER_POINTER (id
);
1503 && (strncmp (name
+ 2, "builtin_",
1504 strlen ("builtin_")) == 0
1505 || (len
= strlen (name
)) <= strlen ("___chk")
1506 || memcmp (name
+ len
- strlen ("_chk"),
1507 "_chk", strlen ("_chk") + 1) != 0))
1509 if (DECL_INITIAL (newdecl
))
1511 error_at (newdecl_loc
,
1512 "definition of %q#D ambiguates built-in "
1513 "declaration %q#D", newdecl
, olddecl
);
1514 return error_mark_node
;
1516 auto_diagnostic_group d
;
1517 if (permerror (newdecl_loc
,
1518 "new declaration %q#D ambiguates built-in"
1519 " declaration %q#D", newdecl
, olddecl
)
1521 inform (newdecl_loc
,
1522 "ignoring the %q#D declaration", newdecl
);
1523 return flag_permissive
? olddecl
: error_mark_node
;
1527 /* A near match; override the builtin. */
1529 if (TREE_PUBLIC (newdecl
))
1530 warning_at (newdecl_loc
,
1531 OPT_Wbuiltin_declaration_mismatch
,
1532 "new declaration %q#D ambiguates built-in "
1533 "declaration %q#D", newdecl
, olddecl
);
1535 warning (OPT_Wshadow
,
1536 fndecl_built_in_p (olddecl
)
1537 ? G_("shadowing built-in function %q#D")
1538 : G_("shadowing library function %q#D"), olddecl
);
1541 /* Discard the old built-in function. */
1544 /* Replace the old RTL to avoid problems with inlining. */
1545 COPY_DECL_RTL (newdecl
, olddecl
);
1547 /* Even if the types match, prefer the new declarations type for
1548 built-ins which have not been explicitly declared, for
1549 exception lists, etc... */
1550 else if (DECL_IS_BUILTIN (olddecl
))
1552 tree type
= TREE_TYPE (newdecl
);
1553 tree attribs
= (*targetm
.merge_type_attributes
)
1554 (TREE_TYPE (olddecl
), type
);
1556 type
= cp_build_type_attribute_variant (type
, attribs
);
1557 TREE_TYPE (newdecl
) = TREE_TYPE (olddecl
) = type
;
1560 /* If a function is explicitly declared "throw ()", propagate that to
1561 the corresponding builtin. */
1562 if (DECL_BUILT_IN_CLASS (olddecl
) == BUILT_IN_NORMAL
1563 && DECL_ANTICIPATED (olddecl
)
1564 && TREE_NOTHROW (newdecl
)
1565 && !TREE_NOTHROW (olddecl
))
1567 enum built_in_function fncode
= DECL_FUNCTION_CODE (olddecl
);
1568 tree tmpdecl
= builtin_decl_explicit (fncode
);
1569 if (tmpdecl
&& tmpdecl
!= olddecl
&& types_match
)
1570 TREE_NOTHROW (tmpdecl
) = 1;
1573 /* Whether or not the builtin can throw exceptions has no
1574 bearing on this declarator. */
1575 TREE_NOTHROW (olddecl
) = 0;
1577 if (DECL_THIS_STATIC (newdecl
) && !DECL_THIS_STATIC (olddecl
))
1579 /* If a builtin function is redeclared as `static', merge
1580 the declarations, but make the original one static. */
1581 DECL_THIS_STATIC (olddecl
) = 1;
1582 TREE_PUBLIC (olddecl
) = 0;
1584 /* Make the old declaration consistent with the new one so
1585 that all remnants of the builtin-ness of this function
1586 will be banished. */
1587 SET_DECL_LANGUAGE (olddecl
, DECL_LANGUAGE (newdecl
));
1588 COPY_DECL_RTL (newdecl
, olddecl
);
1591 else if (TREE_CODE (olddecl
) != TREE_CODE (newdecl
))
1593 /* C++ Standard, 3.3, clause 4:
1594 "[Note: a namespace name or a class template name must be unique
1595 in its declarative region (7.3.2, clause 14). ]" */
1596 if (TREE_CODE (olddecl
) == NAMESPACE_DECL
1597 || TREE_CODE (newdecl
) == NAMESPACE_DECL
)
1598 /* Namespace conflicts with not namespace. */;
1599 else if (DECL_TYPE_TEMPLATE_P (olddecl
)
1600 || DECL_TYPE_TEMPLATE_P (newdecl
))
1601 /* Class template conflicts. */;
1602 else if ((TREE_CODE (newdecl
) == FUNCTION_DECL
1603 && DECL_FUNCTION_TEMPLATE_P (olddecl
))
1604 || (TREE_CODE (olddecl
) == FUNCTION_DECL
1605 && DECL_FUNCTION_TEMPLATE_P (newdecl
)))
1607 /* One is a function and the other is a template
1609 if (!UDLIT_OPER_P (DECL_NAME (newdecl
)))
1612 /* There can only be one! */
1613 if (TREE_CODE (newdecl
) == TEMPLATE_DECL
1614 && check_raw_literal_operator (olddecl
))
1615 error_at (newdecl_loc
,
1616 "literal operator %q#D conflicts with"
1617 " raw literal operator", newdecl
);
1618 else if (check_raw_literal_operator (newdecl
))
1619 error_at (newdecl_loc
,
1620 "raw literal operator %q#D conflicts with"
1621 " literal operator template", newdecl
);
1625 inform (olddecl_loc
, "previous declaration %q#D", olddecl
);
1626 return error_mark_node
;
1628 else if (DECL_IMPLICIT_TYPEDEF_P (olddecl
)
1629 || DECL_IMPLICIT_TYPEDEF_P (newdecl
))
1630 /* One is an implicit typedef, that's ok. */
1633 error ("%q#D redeclared as different kind of entity", newdecl
);
1634 inform (olddecl_loc
, "previous declaration %q#D", olddecl
);
1636 return error_mark_node
;
1638 else if (!types_match
)
1640 if (CP_DECL_CONTEXT (newdecl
) != CP_DECL_CONTEXT (olddecl
))
1641 /* These are certainly not duplicate declarations; they're
1642 from different scopes. */
1645 if (TREE_CODE (newdecl
) == TEMPLATE_DECL
)
1647 /* The name of a class template may not be declared to refer to
1648 any other template, class, function, object, namespace, value,
1649 or type in the same scope. */
1650 if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl
)) == TYPE_DECL
1651 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl
)) == TYPE_DECL
)
1653 error_at (newdecl_loc
,
1654 "conflicting declaration of template %q#D", newdecl
);
1655 inform (olddecl_loc
,
1656 "previous declaration %q#D", olddecl
);
1657 return error_mark_node
;
1659 else if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl
)) == FUNCTION_DECL
1660 && TREE_CODE (DECL_TEMPLATE_RESULT (newdecl
)) == FUNCTION_DECL
1661 && compparms (TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl
))),
1662 TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl
))))
1663 && comp_template_parms (DECL_TEMPLATE_PARMS (newdecl
),
1664 DECL_TEMPLATE_PARMS (olddecl
))
1665 /* Template functions can be disambiguated by
1667 && same_type_p (TREE_TYPE (TREE_TYPE (newdecl
)),
1668 TREE_TYPE (TREE_TYPE (olddecl
)))
1669 /* Template functions can also be disambiguated by
1671 && equivalently_constrained (olddecl
, newdecl
))
1673 error_at (newdecl_loc
, "ambiguating new declaration %q#D",
1675 inform (olddecl_loc
,
1676 "old declaration %q#D", olddecl
);
1678 else if (check_concept_refinement (olddecl
, newdecl
))
1679 return error_mark_node
;
1682 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1684 if (DECL_EXTERN_C_P (newdecl
) && DECL_EXTERN_C_P (olddecl
))
1686 error_at (newdecl_loc
,
1687 "conflicting declaration of C function %q#D",
1689 inform (olddecl_loc
,
1690 "previous declaration %q#D", olddecl
);
1693 /* For function versions, params and types match, but they
1694 are not ambiguous. */
1695 else if ((!DECL_FUNCTION_VERSIONED (newdecl
)
1696 && !DECL_FUNCTION_VERSIONED (olddecl
))
1697 // The functions have the same parameter types.
1698 && compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl
)),
1699 TYPE_ARG_TYPES (TREE_TYPE (olddecl
)))
1700 // And the same constraints.
1701 && equivalently_constrained (newdecl
, olddecl
))
1703 error_at (newdecl_loc
,
1704 "ambiguating new declaration of %q#D", newdecl
);
1705 inform (olddecl_loc
,
1706 "old declaration %q#D", olddecl
);
1707 return error_mark_node
;
1714 error_at (newdecl_loc
, "conflicting declaration %q#D", newdecl
);
1715 inform (olddecl_loc
,
1716 "previous declaration as %q#D", olddecl
);
1717 return error_mark_node
;
1720 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
1721 && ((DECL_TEMPLATE_SPECIALIZATION (olddecl
)
1722 && (!DECL_TEMPLATE_INFO (newdecl
)
1723 || (DECL_TI_TEMPLATE (newdecl
)
1724 != DECL_TI_TEMPLATE (olddecl
))))
1725 || (DECL_TEMPLATE_SPECIALIZATION (newdecl
)
1726 && (!DECL_TEMPLATE_INFO (olddecl
)
1727 || (DECL_TI_TEMPLATE (olddecl
)
1728 != DECL_TI_TEMPLATE (newdecl
))))))
1729 /* It's OK to have a template specialization and a non-template
1730 with the same type, or to have specializations of two
1731 different templates with the same type. Note that if one is a
1732 specialization, and the other is an instantiation of the same
1733 template, that we do not exit at this point. That situation
1734 can occur if we instantiate a template class, and then
1735 specialize one of its methods. This situation is valid, but
1736 the declarations must be merged in the usual way. */
1738 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
1739 && ((DECL_TEMPLATE_INSTANTIATION (olddecl
)
1740 && !DECL_USE_TEMPLATE (newdecl
))
1741 || (DECL_TEMPLATE_INSTANTIATION (newdecl
)
1742 && !DECL_USE_TEMPLATE (olddecl
))))
1743 /* One of the declarations is a template instantiation, and the
1744 other is not a template at all. That's OK. */
1746 else if (TREE_CODE (newdecl
) == NAMESPACE_DECL
)
1748 /* In [namespace.alias] we have:
1750 In a declarative region, a namespace-alias-definition can be
1751 used to redefine a namespace-alias declared in that declarative
1752 region to refer only to the namespace to which it already
1755 Therefore, if we encounter a second alias directive for the same
1756 alias, we can just ignore the second directive. */
1757 if (DECL_NAMESPACE_ALIAS (newdecl
)
1758 && (DECL_NAMESPACE_ALIAS (newdecl
)
1759 == DECL_NAMESPACE_ALIAS (olddecl
)))
1762 /* Leave it to update_binding to merge or report error. */
1767 const char *errmsg
= redeclaration_error_message (newdecl
, olddecl
);
1770 auto_diagnostic_group d
;
1771 error_at (newdecl_loc
, errmsg
, newdecl
);
1772 if (DECL_NAME (olddecl
) != NULL_TREE
)
1773 inform (olddecl_loc
,
1774 (DECL_INITIAL (olddecl
) && namespace_bindings_p ())
1775 ? G_("%q#D previously defined here")
1776 : G_("%q#D previously declared here"), olddecl
);
1777 return error_mark_node
;
1779 else if (TREE_CODE (olddecl
) == FUNCTION_DECL
1780 && DECL_INITIAL (olddecl
) != NULL_TREE
1781 && !prototype_p (TREE_TYPE (olddecl
))
1782 && prototype_p (TREE_TYPE (newdecl
)))
1784 /* Prototype decl follows defn w/o prototype. */
1785 auto_diagnostic_group d
;
1786 if (warning_at (newdecl_loc
, 0,
1787 "prototype specified for %q#D", newdecl
))
1788 inform (olddecl_loc
,
1789 "previous non-prototype definition here");
1791 else if (VAR_OR_FUNCTION_DECL_P (olddecl
)
1792 && DECL_LANGUAGE (newdecl
) != DECL_LANGUAGE (olddecl
))
1795 If two declarations of the same function or object
1796 specify different linkage-specifications ..., the program
1797 is ill-formed.... Except for functions with C++ linkage,
1798 a function declaration without a linkage specification
1799 shall not precede the first linkage specification for
1800 that function. A function can be declared without a
1801 linkage specification after an explicit linkage
1802 specification has been seen; the linkage explicitly
1803 specified in the earlier declaration is not affected by
1804 such a function declaration.
1806 DR 563 raises the question why the restrictions on
1807 functions should not also apply to objects. Older
1808 versions of G++ silently ignore the linkage-specification
1816 which is clearly wrong. Therefore, we now treat objects
1818 if (current_lang_depth () == 0)
1820 /* There is no explicit linkage-specification, so we use
1821 the linkage from the previous declaration. */
1822 retrofit_lang_decl (newdecl
);
1823 SET_DECL_LANGUAGE (newdecl
, DECL_LANGUAGE (olddecl
));
1827 auto_diagnostic_group d
;
1828 error_at (newdecl_loc
,
1829 "conflicting declaration of %q#D with %qL linkage",
1830 newdecl
, DECL_LANGUAGE (newdecl
));
1831 inform (olddecl_loc
,
1832 "previous declaration with %qL linkage",
1833 DECL_LANGUAGE (olddecl
));
1837 if (DECL_LANG_SPECIFIC (olddecl
) && DECL_USE_TEMPLATE (olddecl
))
1839 else if (TREE_CODE (olddecl
) == FUNCTION_DECL
)
1841 /* Note: free functions, as TEMPLATE_DECLs, are handled below. */
1842 if (DECL_FUNCTION_MEMBER_P (olddecl
)
1843 && (/* grokfndecl passes member function templates too
1844 as FUNCTION_DECLs. */
1845 DECL_TEMPLATE_INFO (olddecl
)
1847 Default arguments for a member function of a class
1848 template shall be specified on the initial declaration
1849 of the member function within the class template. */
1850 || CLASSTYPE_TEMPLATE_INFO (CP_DECL_CONTEXT (olddecl
))))
1851 check_redeclaration_no_default_args (newdecl
);
1854 tree t1
= FUNCTION_FIRST_USER_PARMTYPE (olddecl
);
1855 tree t2
= FUNCTION_FIRST_USER_PARMTYPE (newdecl
);
1858 for (; t1
&& t1
!= void_list_node
;
1859 t1
= TREE_CHAIN (t1
), t2
= TREE_CHAIN (t2
), i
++)
1860 if (TREE_PURPOSE (t1
) && TREE_PURPOSE (t2
))
1862 if (simple_cst_equal (TREE_PURPOSE (t1
),
1863 TREE_PURPOSE (t2
)) == 1)
1865 auto_diagnostic_group d
;
1866 if (permerror (newdecl_loc
,
1867 "default argument given for parameter "
1868 "%d of %q#D", i
, newdecl
))
1869 inform (olddecl_loc
,
1870 "previous specification in %q#D here",
1875 auto_diagnostic_group d
;
1876 error_at (newdecl_loc
,
1877 "default argument given for parameter %d "
1878 "of %q#D", i
, newdecl
);
1879 inform (olddecl_loc
,
1880 "previous specification in %q#D here",
1885 /* C++17 11.3.6/4: "If a friend declaration specifies a default
1886 argument expression, that declaration... shall be the only
1887 declaration of the function or function template in the
1888 translation unit." */
1889 check_no_redeclaration_friend_default_args
1890 (olddecl
, newdecl
, DECL_HIDDEN_FRIEND_P (olddecl
));
1895 /* Do not merge an implicit typedef with an explicit one. In:
1899 typedef class A A __attribute__ ((foo));
1901 the attribute should apply only to the typedef. */
1902 if (TREE_CODE (olddecl
) == TYPE_DECL
1903 && (DECL_IMPLICIT_TYPEDEF_P (olddecl
)
1904 || DECL_IMPLICIT_TYPEDEF_P (newdecl
)))
1907 if (!validate_constexpr_redeclaration (olddecl
, newdecl
))
1908 return error_mark_node
;
1910 /* We have committed to returning OLDDECL at this point. */
1912 /* If new decl is `static' and an `extern' was seen previously,
1914 warn_extern_redeclared_static (newdecl
, olddecl
);
1916 /* True to merge attributes between the declarations, false to
1917 set OLDDECL's attributes to those of NEWDECL (for template
1918 explicit specializations that specify their own attributes
1919 independent of those specified for the primary template). */
1920 const bool merge_attr
= (TREE_CODE (newdecl
) != FUNCTION_DECL
1921 || !DECL_TEMPLATE_SPECIALIZATION (newdecl
)
1922 || DECL_TEMPLATE_SPECIALIZATION (olddecl
));
1924 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1926 if (merge_attr
&& diagnose_mismatched_attributes (olddecl
, newdecl
))
1927 inform (olddecl_loc
, DECL_INITIAL (olddecl
)
1928 ? G_("previous definition of %qD here")
1929 : G_("previous declaration of %qD here"), olddecl
);
1931 /* Now that functions must hold information normally held
1932 by field decls, there is extra work to do so that
1933 declaration information does not get destroyed during
1935 if (DECL_VINDEX (olddecl
))
1936 DECL_VINDEX (newdecl
) = DECL_VINDEX (olddecl
);
1937 if (DECL_CONTEXT (olddecl
))
1938 DECL_CONTEXT (newdecl
) = DECL_CONTEXT (olddecl
);
1939 DECL_STATIC_CONSTRUCTOR (newdecl
) |= DECL_STATIC_CONSTRUCTOR (olddecl
);
1940 DECL_STATIC_DESTRUCTOR (newdecl
) |= DECL_STATIC_DESTRUCTOR (olddecl
);
1941 DECL_PURE_VIRTUAL_P (newdecl
) |= DECL_PURE_VIRTUAL_P (olddecl
);
1942 DECL_VIRTUAL_P (newdecl
) |= DECL_VIRTUAL_P (olddecl
);
1943 DECL_INVALID_OVERRIDER_P (newdecl
) |= DECL_INVALID_OVERRIDER_P (olddecl
);
1944 DECL_FINAL_P (newdecl
) |= DECL_FINAL_P (olddecl
);
1945 DECL_OVERRIDE_P (newdecl
) |= DECL_OVERRIDE_P (olddecl
);
1946 DECL_THIS_STATIC (newdecl
) |= DECL_THIS_STATIC (olddecl
);
1947 if (DECL_OVERLOADED_OPERATOR_P (olddecl
))
1948 DECL_OVERLOADED_OPERATOR_CODE_RAW (newdecl
)
1949 = DECL_OVERLOADED_OPERATOR_CODE_RAW (olddecl
);
1950 new_defines_function
= DECL_INITIAL (newdecl
) != NULL_TREE
;
1952 /* Optionally warn about more than one declaration for the same
1953 name, but don't warn about a function declaration followed by a
1955 if (warn_redundant_decls
&& ! DECL_ARTIFICIAL (olddecl
)
1956 && !(new_defines_function
&& DECL_INITIAL (olddecl
) == NULL_TREE
)
1957 /* Don't warn about extern decl followed by definition. */
1958 && !(DECL_EXTERNAL (olddecl
) && ! DECL_EXTERNAL (newdecl
))
1959 /* Don't warn about friends, let add_friend take care of it. */
1960 && ! (newdecl_is_friend
|| DECL_FRIEND_P (olddecl
))
1961 /* Don't warn about declaration followed by specialization. */
1962 && (! DECL_TEMPLATE_SPECIALIZATION (newdecl
)
1963 || DECL_TEMPLATE_SPECIALIZATION (olddecl
)))
1965 auto_diagnostic_group d
;
1966 if (warning_at (newdecl_loc
,
1967 OPT_Wredundant_decls
,
1968 "redundant redeclaration of %qD in same scope",
1970 inform (olddecl_loc
,
1971 "previous declaration of %qD", olddecl
);
1974 if (!(DECL_TEMPLATE_INSTANTIATION (olddecl
)
1975 && DECL_TEMPLATE_SPECIALIZATION (newdecl
)))
1977 if (DECL_DELETED_FN (newdecl
))
1979 auto_diagnostic_group d
;
1980 error_at (newdecl_loc
, "deleted definition of %qD", newdecl
);
1981 inform (olddecl_loc
,
1982 "previous declaration of %qD", olddecl
);
1984 DECL_DELETED_FN (newdecl
) |= DECL_DELETED_FN (olddecl
);
1988 /* Deal with C++: must preserve virtual function table size. */
1989 if (TREE_CODE (olddecl
) == TYPE_DECL
)
1991 tree newtype
= TREE_TYPE (newdecl
);
1992 tree oldtype
= TREE_TYPE (olddecl
);
1994 if (newtype
!= error_mark_node
&& oldtype
!= error_mark_node
1995 && TYPE_LANG_SPECIFIC (newtype
) && TYPE_LANG_SPECIFIC (oldtype
))
1996 CLASSTYPE_FRIEND_CLASSES (newtype
)
1997 = CLASSTYPE_FRIEND_CLASSES (oldtype
);
1999 DECL_ORIGINAL_TYPE (newdecl
) = DECL_ORIGINAL_TYPE (olddecl
);
2002 /* Copy all the DECL_... slots specified in the new decl except for
2003 any that we copy here from the old type. */
2005 DECL_ATTRIBUTES (newdecl
)
2006 = (*targetm
.merge_decl_attributes
) (olddecl
, newdecl
);
2008 DECL_ATTRIBUTES (olddecl
) = DECL_ATTRIBUTES (newdecl
);
2010 if (DECL_DECLARES_FUNCTION_P (olddecl
))
2012 olddecl_friend
= DECL_FRIEND_P (olddecl
);
2013 olddecl_hidden_friend
= DECL_HIDDEN_FRIEND_P (olddecl
);
2014 hidden_friend
= (DECL_ANTICIPATED (olddecl
)
2015 && DECL_HIDDEN_FRIEND_P (olddecl
)
2016 && newdecl_is_friend
);
2019 DECL_ANTICIPATED (olddecl
) = 0;
2020 DECL_HIDDEN_FRIEND_P (olddecl
) = 0;
2024 if (TREE_CODE (newdecl
) == TEMPLATE_DECL
)
2026 tree old_result
= DECL_TEMPLATE_RESULT (olddecl
);
2027 tree new_result
= DECL_TEMPLATE_RESULT (newdecl
);
2028 TREE_TYPE (olddecl
) = TREE_TYPE (old_result
);
2029 DECL_TEMPLATE_SPECIALIZATIONS (olddecl
)
2030 = chainon (DECL_TEMPLATE_SPECIALIZATIONS (olddecl
),
2031 DECL_TEMPLATE_SPECIALIZATIONS (newdecl
));
2033 DECL_ATTRIBUTES (old_result
)
2034 = (*targetm
.merge_decl_attributes
) (old_result
, new_result
);
2036 if (DECL_FUNCTION_TEMPLATE_P (newdecl
))
2038 if (DECL_SOURCE_LOCATION (newdecl
)
2039 != DECL_SOURCE_LOCATION (olddecl
))
2041 /* Per C++11 8.3.6/4, default arguments cannot be added in
2042 later declarations of a function template. */
2043 check_redeclaration_no_default_args (newdecl
);
2044 /* C++17 11.3.6/4: "If a friend declaration specifies a default
2045 argument expression, that declaration... shall be the only
2046 declaration of the function or function template in the
2047 translation unit." */
2048 check_no_redeclaration_friend_default_args
2049 (old_result
, new_result
, olddecl_hidden_friend
);
2052 check_default_args (newdecl
);
2054 if (GNU_INLINE_P (old_result
) != GNU_INLINE_P (new_result
)
2055 && DECL_INITIAL (new_result
))
2057 if (DECL_INITIAL (old_result
))
2058 DECL_UNINLINABLE (old_result
) = 1;
2060 DECL_UNINLINABLE (old_result
) = DECL_UNINLINABLE (new_result
);
2061 DECL_EXTERNAL (old_result
) = DECL_EXTERNAL (new_result
);
2062 DECL_NOT_REALLY_EXTERN (old_result
)
2063 = DECL_NOT_REALLY_EXTERN (new_result
);
2064 DECL_INTERFACE_KNOWN (old_result
)
2065 = DECL_INTERFACE_KNOWN (new_result
);
2066 DECL_DECLARED_INLINE_P (old_result
)
2067 = DECL_DECLARED_INLINE_P (new_result
);
2068 DECL_DISREGARD_INLINE_LIMITS (old_result
)
2069 |= DECL_DISREGARD_INLINE_LIMITS (new_result
);
2074 DECL_DECLARED_INLINE_P (old_result
)
2075 |= DECL_DECLARED_INLINE_P (new_result
);
2076 DECL_DISREGARD_INLINE_LIMITS (old_result
)
2077 |= DECL_DISREGARD_INLINE_LIMITS (new_result
);
2078 check_redeclaration_exception_specification (newdecl
, olddecl
);
2080 merge_attribute_bits (new_result
, old_result
);
2084 /* If the new declaration is a definition, update the file and
2085 line information on the declaration, and also make
2086 the old declaration the same definition. */
2087 if (DECL_INITIAL (new_result
) != NULL_TREE
)
2089 DECL_SOURCE_LOCATION (olddecl
)
2090 = DECL_SOURCE_LOCATION (old_result
)
2091 = DECL_SOURCE_LOCATION (newdecl
);
2092 DECL_INITIAL (old_result
) = DECL_INITIAL (new_result
);
2093 if (DECL_FUNCTION_TEMPLATE_P (newdecl
))
2096 DECL_ARGUMENTS (old_result
)
2097 = DECL_ARGUMENTS (new_result
);
2098 for (parm
= DECL_ARGUMENTS (old_result
); parm
;
2099 parm
= DECL_CHAIN (parm
))
2100 DECL_CONTEXT (parm
) = old_result
;
2109 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2110 check_redeclaration_exception_specification (newdecl
, olddecl
);
2112 /* Automatically handles default parameters. */
2113 tree oldtype
= TREE_TYPE (olddecl
);
2116 /* For typedefs use the old type, as the new type's DECL_NAME points
2117 at newdecl, which will be ggc_freed. */
2118 if (TREE_CODE (newdecl
) == TYPE_DECL
)
2120 /* But NEWTYPE might have an attribute, honor that. */
2121 tree tem
= TREE_TYPE (newdecl
);
2124 if (TYPE_USER_ALIGN (tem
))
2126 if (TYPE_ALIGN (tem
) > TYPE_ALIGN (newtype
))
2127 SET_TYPE_ALIGN (newtype
, TYPE_ALIGN (tem
));
2128 TYPE_USER_ALIGN (newtype
) = true;
2131 /* And remove the new type from the variants list. */
2132 if (TYPE_NAME (TREE_TYPE (newdecl
)) == newdecl
)
2134 tree remove
= TREE_TYPE (newdecl
);
2135 for (tree t
= TYPE_MAIN_VARIANT (remove
); ;
2136 t
= TYPE_NEXT_VARIANT (t
))
2137 if (TYPE_NEXT_VARIANT (t
) == remove
)
2139 TYPE_NEXT_VARIANT (t
) = TYPE_NEXT_VARIANT (remove
);
2144 else if (merge_attr
)
2145 newtype
= merge_types (TREE_TYPE (newdecl
), TREE_TYPE (olddecl
));
2147 newtype
= TREE_TYPE (newdecl
);
2149 if (VAR_P (newdecl
))
2151 DECL_THIS_EXTERN (newdecl
) |= DECL_THIS_EXTERN (olddecl
);
2152 /* For already initialized vars, TREE_READONLY could have been
2153 cleared in cp_finish_decl, because the var needs runtime
2154 initialization or destruction. Make sure not to set
2155 TREE_READONLY on it again. */
2156 if (DECL_INITIALIZED_P (olddecl
)
2157 && !DECL_EXTERNAL (olddecl
)
2158 && !TREE_READONLY (olddecl
))
2159 TREE_READONLY (newdecl
) = 0;
2160 DECL_INITIALIZED_P (newdecl
) |= DECL_INITIALIZED_P (olddecl
);
2161 DECL_NONTRIVIALLY_INITIALIZED_P (newdecl
)
2162 |= DECL_NONTRIVIALLY_INITIALIZED_P (olddecl
);
2163 if (DECL_DEPENDENT_INIT_P (olddecl
))
2164 SET_DECL_DEPENDENT_INIT_P (newdecl
, true);
2165 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (newdecl
)
2166 |= DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (olddecl
);
2167 if (DECL_CLASS_SCOPE_P (olddecl
))
2168 DECL_DECLARED_CONSTEXPR_P (newdecl
)
2169 |= DECL_DECLARED_CONSTEXPR_P (olddecl
);
2171 /* Merge the threadprivate attribute from OLDDECL into NEWDECL. */
2172 if (DECL_LANG_SPECIFIC (olddecl
)
2173 && CP_DECL_THREADPRIVATE_P (olddecl
))
2175 /* Allocate a LANG_SPECIFIC structure for NEWDECL, if needed. */
2176 retrofit_lang_decl (newdecl
);
2177 CP_DECL_THREADPRIVATE_P (newdecl
) = 1;
2181 /* An explicit specialization of a function template or of a member
2182 function of a class template can be declared transaction_safe
2183 independently of whether the corresponding template entity is declared
2184 transaction_safe. */
2185 if (flag_tm
&& TREE_CODE (newdecl
) == FUNCTION_DECL
2186 && DECL_TEMPLATE_INSTANTIATION (olddecl
)
2187 && DECL_TEMPLATE_SPECIALIZATION (newdecl
)
2188 && tx_safe_fn_type_p (newtype
)
2189 && !tx_safe_fn_type_p (TREE_TYPE (newdecl
)))
2190 newtype
= tx_unsafe_fn_variant (newtype
);
2192 TREE_TYPE (newdecl
) = TREE_TYPE (olddecl
) = newtype
;
2194 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2195 check_default_args (newdecl
);
2197 /* Lay the type out, unless already done. */
2198 if (! same_type_p (newtype
, oldtype
)
2199 && TREE_TYPE (newdecl
) != error_mark_node
2200 && !(processing_template_decl
&& uses_template_parms (newdecl
)))
2201 layout_type (TREE_TYPE (newdecl
));
2203 if ((VAR_P (newdecl
)
2204 || TREE_CODE (newdecl
) == PARM_DECL
2205 || TREE_CODE (newdecl
) == RESULT_DECL
2206 || TREE_CODE (newdecl
) == FIELD_DECL
2207 || TREE_CODE (newdecl
) == TYPE_DECL
)
2208 && !(processing_template_decl
&& uses_template_parms (newdecl
)))
2209 layout_decl (newdecl
, 0);
2211 /* Merge deprecatedness. */
2212 if (TREE_DEPRECATED (newdecl
))
2213 TREE_DEPRECATED (olddecl
) = 1;
2215 /* Preserve function specific target and optimization options */
2216 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2218 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl
)
2219 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl
))
2220 DECL_FUNCTION_SPECIFIC_TARGET (newdecl
)
2221 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl
);
2223 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl
)
2224 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl
))
2225 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl
)
2226 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl
);
2230 /* Merge the const type qualifier. */
2231 if (TREE_READONLY (newdecl
))
2232 TREE_READONLY (olddecl
) = 1;
2233 /* Merge the volatile type qualifier. */
2234 if (TREE_THIS_VOLATILE (newdecl
))
2235 TREE_THIS_VOLATILE (olddecl
) = 1;
2238 /* Merge the initialization information. */
2239 if (DECL_INITIAL (newdecl
) == NULL_TREE
2240 && DECL_INITIAL (olddecl
) != NULL_TREE
)
2242 DECL_INITIAL (newdecl
) = DECL_INITIAL (olddecl
);
2243 DECL_SOURCE_LOCATION (newdecl
) = DECL_SOURCE_LOCATION (olddecl
);
2244 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2246 DECL_SAVED_TREE (newdecl
) = DECL_SAVED_TREE (olddecl
);
2247 DECL_STRUCT_FUNCTION (newdecl
) = DECL_STRUCT_FUNCTION (olddecl
);
2251 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2253 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl
)
2254 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl
);
2255 DECL_NO_LIMIT_STACK (newdecl
) |= DECL_NO_LIMIT_STACK (olddecl
);
2256 DECL_IS_OPERATOR_NEW (newdecl
) |= DECL_IS_OPERATOR_NEW (olddecl
);
2257 DECL_LOOPING_CONST_OR_PURE_P (newdecl
)
2258 |= DECL_LOOPING_CONST_OR_PURE_P (olddecl
);
2261 merge_attribute_bits (newdecl
, olddecl
);
2264 /* Merge the noreturn bit. */
2265 TREE_THIS_VOLATILE (olddecl
) = TREE_THIS_VOLATILE (newdecl
);
2266 TREE_READONLY (olddecl
) = TREE_READONLY (newdecl
);
2267 TREE_NOTHROW (olddecl
) = TREE_NOTHROW (newdecl
);
2268 DECL_IS_MALLOC (olddecl
) = DECL_IS_MALLOC (newdecl
);
2269 DECL_PURE_P (olddecl
) = DECL_PURE_P (newdecl
);
2271 /* Keep the old RTL. */
2272 COPY_DECL_RTL (olddecl
, newdecl
);
2274 else if (VAR_P (newdecl
)
2275 && (DECL_SIZE (olddecl
) || !DECL_SIZE (newdecl
)))
2277 /* Keep the old RTL. We cannot keep the old RTL if the old
2278 declaration was for an incomplete object and the new
2279 declaration is not since many attributes of the RTL will
2281 COPY_DECL_RTL (olddecl
, newdecl
);
2284 /* If cannot merge, then use the new type and qualifiers,
2285 and don't preserve the old rtl. */
2288 /* Clean out any memory we had of the old declaration. */
2289 tree oldstatic
= value_member (olddecl
, static_aggregates
);
2291 TREE_VALUE (oldstatic
) = error_mark_node
;
2293 TREE_TYPE (olddecl
) = TREE_TYPE (newdecl
);
2294 TREE_READONLY (olddecl
) = TREE_READONLY (newdecl
);
2295 TREE_THIS_VOLATILE (olddecl
) = TREE_THIS_VOLATILE (newdecl
);
2296 TREE_NOTHROW (olddecl
) = TREE_NOTHROW (newdecl
);
2297 TREE_SIDE_EFFECTS (olddecl
) = TREE_SIDE_EFFECTS (newdecl
);
2300 /* Merge the storage class information. */
2301 merge_weak (newdecl
, olddecl
);
2303 DECL_DEFER_OUTPUT (newdecl
) |= DECL_DEFER_OUTPUT (olddecl
);
2304 TREE_PUBLIC (newdecl
) = TREE_PUBLIC (olddecl
);
2305 TREE_STATIC (olddecl
) = TREE_STATIC (newdecl
) |= TREE_STATIC (olddecl
);
2306 if (! DECL_EXTERNAL (olddecl
))
2307 DECL_EXTERNAL (newdecl
) = 0;
2308 if (! DECL_COMDAT (olddecl
))
2309 DECL_COMDAT (newdecl
) = 0;
2311 new_template_info
= NULL_TREE
;
2312 if (DECL_LANG_SPECIFIC (newdecl
) && DECL_LANG_SPECIFIC (olddecl
))
2314 bool new_redefines_gnu_inline
= false;
2316 if (new_defines_function
2317 && ((DECL_INTERFACE_KNOWN (olddecl
)
2318 && TREE_CODE (olddecl
) == FUNCTION_DECL
)
2319 || (TREE_CODE (olddecl
) == TEMPLATE_DECL
2320 && (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl
))
2321 == FUNCTION_DECL
))))
2325 if (TREE_CODE (fn
) == TEMPLATE_DECL
)
2326 fn
= DECL_TEMPLATE_RESULT (olddecl
);
2328 new_redefines_gnu_inline
= GNU_INLINE_P (fn
) && DECL_INITIAL (fn
);
2331 if (!new_redefines_gnu_inline
)
2333 DECL_INTERFACE_KNOWN (newdecl
) |= DECL_INTERFACE_KNOWN (olddecl
);
2334 DECL_NOT_REALLY_EXTERN (newdecl
) |= DECL_NOT_REALLY_EXTERN (olddecl
);
2335 DECL_COMDAT (newdecl
) |= DECL_COMDAT (olddecl
);
2337 DECL_TEMPLATE_INSTANTIATED (newdecl
)
2338 |= DECL_TEMPLATE_INSTANTIATED (olddecl
);
2339 DECL_ODR_USED (newdecl
) |= DECL_ODR_USED (olddecl
);
2341 /* If the OLDDECL is an instantiation and/or specialization,
2342 then the NEWDECL must be too. But, it may not yet be marked
2343 as such if the caller has created NEWDECL, but has not yet
2344 figured out that it is a redeclaration. */
2345 if (!DECL_USE_TEMPLATE (newdecl
))
2346 DECL_USE_TEMPLATE (newdecl
) = DECL_USE_TEMPLATE (olddecl
);
2348 /* Don't really know how much of the language-specific
2349 values we should copy from old to new. */
2350 DECL_IN_AGGR_P (newdecl
) = DECL_IN_AGGR_P (olddecl
);
2351 DECL_REPO_AVAILABLE_P (newdecl
) = DECL_REPO_AVAILABLE_P (olddecl
);
2352 DECL_INITIALIZED_IN_CLASS_P (newdecl
)
2353 |= DECL_INITIALIZED_IN_CLASS_P (olddecl
);
2355 if (LANG_DECL_HAS_MIN (newdecl
))
2357 DECL_ACCESS (newdecl
) = DECL_ACCESS (olddecl
);
2358 if (DECL_TEMPLATE_INFO (newdecl
))
2360 new_template_info
= DECL_TEMPLATE_INFO (newdecl
);
2361 if (DECL_TEMPLATE_INSTANTIATION (olddecl
)
2362 && DECL_TEMPLATE_SPECIALIZATION (newdecl
))
2363 /* Remember the presence of explicit specialization args. */
2364 TINFO_USED_TEMPLATE_ID (DECL_TEMPLATE_INFO (olddecl
))
2365 = TINFO_USED_TEMPLATE_ID (new_template_info
);
2367 DECL_TEMPLATE_INFO (newdecl
) = DECL_TEMPLATE_INFO (olddecl
);
2369 /* Only functions have these fields. */
2370 if (DECL_DECLARES_FUNCTION_P (newdecl
))
2372 DECL_NONCONVERTING_P (newdecl
) = DECL_NONCONVERTING_P (olddecl
);
2373 DECL_BEFRIENDING_CLASSES (newdecl
)
2374 = chainon (DECL_BEFRIENDING_CLASSES (newdecl
),
2375 DECL_BEFRIENDING_CLASSES (olddecl
));
2376 /* DECL_THUNKS is only valid for virtual functions,
2377 otherwise it is a DECL_FRIEND_CONTEXT. */
2378 if (DECL_VIRTUAL_P (newdecl
))
2379 SET_DECL_THUNKS (newdecl
, DECL_THUNKS (olddecl
));
2381 /* Only variables have this field. */
2382 else if (VAR_P (newdecl
)
2383 && VAR_HAD_UNKNOWN_BOUND (olddecl
))
2384 SET_VAR_HAD_UNKNOWN_BOUND (newdecl
);
2387 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2391 /* Merge parameter attributes. */
2392 tree oldarg
, newarg
;
2393 for (oldarg
= DECL_ARGUMENTS(olddecl
), newarg
= DECL_ARGUMENTS(newdecl
);
2395 oldarg
= DECL_CHAIN(oldarg
), newarg
= DECL_CHAIN(newarg
))
2397 DECL_ATTRIBUTES (newarg
)
2398 = (*targetm
.merge_decl_attributes
) (oldarg
, newarg
);
2399 DECL_ATTRIBUTES (oldarg
) = DECL_ATTRIBUTES (newarg
);
2402 if (DECL_TEMPLATE_INSTANTIATION (olddecl
)
2403 && !DECL_TEMPLATE_INSTANTIATION (newdecl
))
2405 /* If newdecl is not a specialization, then it is not a
2406 template-related function at all. And that means that we
2407 should have exited above, returning 0. */
2408 gcc_assert (DECL_TEMPLATE_SPECIALIZATION (newdecl
));
2410 if (DECL_ODR_USED (olddecl
))
2411 /* From [temp.expl.spec]:
2413 If a template, a member template or the member of a class
2414 template is explicitly specialized then that
2415 specialization shall be declared before the first use of
2416 that specialization that would cause an implicit
2417 instantiation to take place, in every translation unit in
2418 which such a use occurs. */
2419 error ("explicit specialization of %qD after first use",
2422 SET_DECL_TEMPLATE_SPECIALIZATION (olddecl
);
2423 DECL_COMDAT (newdecl
) = (TREE_PUBLIC (newdecl
)
2424 && DECL_DECLARED_INLINE_P (newdecl
));
2426 /* Don't propagate visibility from the template to the
2427 specialization here. We'll do that in determine_visibility if
2429 DECL_VISIBILITY_SPECIFIED (olddecl
) = 0;
2431 /* [temp.expl.spec/14] We don't inline explicit specialization
2432 just because the primary template says so. */
2433 gcc_assert (!merge_attr
);
2435 DECL_DECLARED_INLINE_P (olddecl
)
2436 = DECL_DECLARED_INLINE_P (newdecl
);
2438 DECL_DISREGARD_INLINE_LIMITS (olddecl
)
2439 = DECL_DISREGARD_INLINE_LIMITS (newdecl
);
2441 DECL_UNINLINABLE (olddecl
) = DECL_UNINLINABLE (newdecl
);
2443 else if (new_defines_function
&& DECL_INITIAL (olddecl
))
2445 /* Never inline re-defined extern inline functions.
2446 FIXME: this could be better handled by keeping both
2447 function as separate declarations. */
2448 DECL_UNINLINABLE (newdecl
) = 1;
2452 if (DECL_PENDING_INLINE_P (olddecl
))
2454 DECL_PENDING_INLINE_P (newdecl
) = 1;
2455 DECL_PENDING_INLINE_INFO (newdecl
)
2456 = DECL_PENDING_INLINE_INFO (olddecl
);
2458 else if (DECL_PENDING_INLINE_P (newdecl
))
2460 else if (DECL_SAVED_FUNCTION_DATA (newdecl
) == NULL
)
2461 DECL_SAVED_FUNCTION_DATA (newdecl
)
2462 = DECL_SAVED_FUNCTION_DATA (olddecl
);
2464 DECL_DECLARED_INLINE_P (newdecl
) |= DECL_DECLARED_INLINE_P (olddecl
);
2466 DECL_UNINLINABLE (newdecl
) = DECL_UNINLINABLE (olddecl
)
2467 = (DECL_UNINLINABLE (newdecl
) || DECL_UNINLINABLE (olddecl
));
2469 DECL_DISREGARD_INLINE_LIMITS (newdecl
)
2470 = DECL_DISREGARD_INLINE_LIMITS (olddecl
)
2471 = (DECL_DISREGARD_INLINE_LIMITS (newdecl
)
2472 || DECL_DISREGARD_INLINE_LIMITS (olddecl
));
2475 /* Preserve abstractness on cloned [cd]tors. */
2476 DECL_ABSTRACT_P (newdecl
) = DECL_ABSTRACT_P (olddecl
);
2478 /* Update newdecl's parms to point at olddecl. */
2479 for (parm
= DECL_ARGUMENTS (newdecl
); parm
;
2480 parm
= DECL_CHAIN (parm
))
2481 DECL_CONTEXT (parm
) = olddecl
;
2485 SET_DECL_LANGUAGE (olddecl
, DECL_LANGUAGE (newdecl
));
2486 COPY_DECL_ASSEMBLER_NAME (newdecl
, olddecl
);
2487 COPY_DECL_RTL (newdecl
, olddecl
);
2489 if (! types_match
|| new_defines_function
)
2491 /* These need to be copied so that the names are available.
2492 Note that if the types do match, we'll preserve inline
2493 info and other bits, but if not, we won't. */
2494 DECL_ARGUMENTS (olddecl
) = DECL_ARGUMENTS (newdecl
);
2495 DECL_RESULT (olddecl
) = DECL_RESULT (newdecl
);
2497 /* If redeclaring a builtin function, it stays built in
2498 if newdecl is a gnu_inline definition, or if newdecl is just
2500 if (fndecl_built_in_p (olddecl
)
2501 && (new_defines_function
? GNU_INLINE_P (newdecl
) : types_match
))
2503 DECL_BUILT_IN_CLASS (newdecl
) = DECL_BUILT_IN_CLASS (olddecl
);
2504 DECL_FUNCTION_CODE (newdecl
) = DECL_FUNCTION_CODE (olddecl
);
2505 /* If we're keeping the built-in definition, keep the rtl,
2506 regardless of declaration matches. */
2507 COPY_DECL_RTL (olddecl
, newdecl
);
2508 if (DECL_BUILT_IN_CLASS (newdecl
) == BUILT_IN_NORMAL
)
2510 enum built_in_function fncode
= DECL_FUNCTION_CODE (newdecl
);
2513 /* If a compatible prototype of these builtin functions
2514 is seen, assume the runtime implements it with the
2515 expected semantics. */
2516 case BUILT_IN_STPCPY
:
2517 if (builtin_decl_explicit_p (fncode
))
2518 set_builtin_decl_implicit_p (fncode
, true);
2521 if (builtin_decl_explicit_p (fncode
))
2522 set_builtin_decl_declared_p (fncode
, true);
2527 copy_attributes_to_builtin (newdecl
);
2529 if (new_defines_function
)
2530 /* If defining a function declared with other language
2531 linkage, use the previously declared language linkage. */
2532 SET_DECL_LANGUAGE (newdecl
, DECL_LANGUAGE (olddecl
));
2533 else if (types_match
)
2535 DECL_RESULT (newdecl
) = DECL_RESULT (olddecl
);
2536 /* Don't clear out the arguments if we're just redeclaring a
2538 if (DECL_ARGUMENTS (olddecl
))
2539 DECL_ARGUMENTS (newdecl
) = DECL_ARGUMENTS (olddecl
);
2542 else if (TREE_CODE (newdecl
) == NAMESPACE_DECL
)
2543 NAMESPACE_LEVEL (newdecl
) = NAMESPACE_LEVEL (olddecl
);
2545 /* Now preserve various other info from the definition. */
2546 TREE_ADDRESSABLE (newdecl
) = TREE_ADDRESSABLE (olddecl
);
2547 TREE_ASM_WRITTEN (newdecl
) = TREE_ASM_WRITTEN (olddecl
);
2548 DECL_COMMON (newdecl
) = DECL_COMMON (olddecl
);
2549 COPY_DECL_ASSEMBLER_NAME (olddecl
, newdecl
);
2551 /* Warn about conflicting visibility specifications. */
2552 if (DECL_VISIBILITY_SPECIFIED (olddecl
)
2553 && DECL_VISIBILITY_SPECIFIED (newdecl
)
2554 && DECL_VISIBILITY (newdecl
) != DECL_VISIBILITY (olddecl
))
2556 auto_diagnostic_group d
;
2557 if (warning_at (newdecl_loc
, OPT_Wattributes
,
2558 "%qD: visibility attribute ignored because it "
2559 "conflicts with previous declaration", newdecl
))
2560 inform (olddecl_loc
,
2561 "previous declaration of %qD", olddecl
);
2563 /* Choose the declaration which specified visibility. */
2564 if (DECL_VISIBILITY_SPECIFIED (olddecl
))
2566 DECL_VISIBILITY (newdecl
) = DECL_VISIBILITY (olddecl
);
2567 DECL_VISIBILITY_SPECIFIED (newdecl
) = 1;
2569 /* Init priority used to be merged from newdecl to olddecl by the memcpy,
2570 so keep this behavior. */
2571 if (VAR_P (newdecl
) && DECL_HAS_INIT_PRIORITY_P (newdecl
))
2573 SET_DECL_INIT_PRIORITY (olddecl
, DECL_INIT_PRIORITY (newdecl
));
2574 DECL_HAS_INIT_PRIORITY_P (olddecl
) = 1;
2576 /* Likewise for DECL_ALIGN, DECL_USER_ALIGN and DECL_PACKED. */
2577 if (DECL_ALIGN (olddecl
) > DECL_ALIGN (newdecl
))
2579 SET_DECL_ALIGN (newdecl
, DECL_ALIGN (olddecl
));
2580 DECL_USER_ALIGN (newdecl
) |= DECL_USER_ALIGN (olddecl
);
2582 DECL_USER_ALIGN (olddecl
) = DECL_USER_ALIGN (newdecl
);
2583 if (DECL_WARN_IF_NOT_ALIGN (olddecl
)
2584 > DECL_WARN_IF_NOT_ALIGN (newdecl
))
2585 SET_DECL_WARN_IF_NOT_ALIGN (newdecl
,
2586 DECL_WARN_IF_NOT_ALIGN (olddecl
));
2587 if (TREE_CODE (newdecl
) == FIELD_DECL
)
2588 DECL_PACKED (olddecl
) = DECL_PACKED (newdecl
);
2590 /* The DECL_LANG_SPECIFIC information in OLDDECL will be replaced
2591 with that from NEWDECL below. */
2592 if (DECL_LANG_SPECIFIC (olddecl
))
2594 gcc_assert (DECL_LANG_SPECIFIC (olddecl
)
2595 != DECL_LANG_SPECIFIC (newdecl
));
2596 ggc_free (DECL_LANG_SPECIFIC (olddecl
));
2599 /* Merge the USED information. */
2600 if (TREE_USED (olddecl
))
2601 TREE_USED (newdecl
) = 1;
2602 else if (TREE_USED (newdecl
))
2603 TREE_USED (olddecl
) = 1;
2604 if (VAR_P (newdecl
))
2606 if (DECL_READ_P (olddecl
))
2607 DECL_READ_P (newdecl
) = 1;
2608 else if (DECL_READ_P (newdecl
))
2609 DECL_READ_P (olddecl
) = 1;
2611 if (DECL_PRESERVE_P (olddecl
))
2612 DECL_PRESERVE_P (newdecl
) = 1;
2613 else if (DECL_PRESERVE_P (newdecl
))
2614 DECL_PRESERVE_P (olddecl
) = 1;
2616 /* Merge the DECL_FUNCTION_VERSIONED information. newdecl will be copied
2617 to olddecl and deleted. */
2618 if (TREE_CODE (newdecl
) == FUNCTION_DECL
2619 && DECL_FUNCTION_VERSIONED (olddecl
))
2621 /* Set the flag for newdecl so that it gets copied to olddecl. */
2622 DECL_FUNCTION_VERSIONED (newdecl
) = 1;
2623 /* newdecl will be purged after copying to olddecl and is no longer
2625 cgraph_node::delete_function_version_by_decl (newdecl
);
2628 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2631 struct symtab_node
*snode
= symtab_node::get (olddecl
);
2633 function_size
= sizeof (struct tree_decl_common
);
2635 memcpy ((char *) olddecl
+ sizeof (struct tree_common
),
2636 (char *) newdecl
+ sizeof (struct tree_common
),
2637 function_size
- sizeof (struct tree_common
));
2639 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
2640 (char *) newdecl
+ sizeof (struct tree_decl_common
),
2641 sizeof (struct tree_function_decl
) - sizeof (struct tree_decl_common
));
2643 /* Preserve symtab node mapping. */
2644 olddecl
->decl_with_vis
.symtab_node
= snode
;
2646 if (new_template_info
)
2647 /* If newdecl is a template instantiation, it is possible that
2648 the following sequence of events has occurred:
2650 o A friend function was declared in a class template. The
2651 class template was instantiated.
2653 o The instantiation of the friend declaration was
2654 recorded on the instantiation list, and is newdecl.
2656 o Later, however, instantiate_class_template called pushdecl
2657 on the newdecl to perform name injection. But, pushdecl in
2658 turn called duplicate_decls when it discovered that another
2659 declaration of a global function with the same name already
2662 o Here, in duplicate_decls, we decided to clobber newdecl.
2664 If we're going to do that, we'd better make sure that
2665 olddecl, and not newdecl, is on the list of
2666 instantiations so that if we try to do the instantiation
2667 again we won't get the clobbered declaration. */
2668 reregister_specialization (newdecl
,
2674 size_t size
= tree_code_size (TREE_CODE (newdecl
));
2676 memcpy ((char *) olddecl
+ sizeof (struct tree_common
),
2677 (char *) newdecl
+ sizeof (struct tree_common
),
2678 sizeof (struct tree_decl_common
) - sizeof (struct tree_common
));
2679 switch (TREE_CODE (newdecl
))
2689 struct symtab_node
*snode
= NULL
;
2692 && (TREE_STATIC (olddecl
) || TREE_PUBLIC (olddecl
)
2693 || DECL_EXTERNAL (olddecl
)))
2694 snode
= symtab_node::get (olddecl
);
2695 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
2696 (char *) newdecl
+ sizeof (struct tree_decl_common
),
2697 size
- sizeof (struct tree_decl_common
)
2698 + TREE_CODE_LENGTH (TREE_CODE (newdecl
)) * sizeof (char *));
2699 if (VAR_P (newdecl
))
2700 olddecl
->decl_with_vis
.symtab_node
= snode
;
2704 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
2705 (char *) newdecl
+ sizeof (struct tree_decl_common
),
2706 sizeof (struct tree_decl_non_common
) - sizeof (struct tree_decl_common
)
2707 + TREE_CODE_LENGTH (TREE_CODE (newdecl
)) * sizeof (char *));
2712 if (VAR_OR_FUNCTION_DECL_P (newdecl
))
2714 if (DECL_EXTERNAL (olddecl
)
2715 || TREE_PUBLIC (olddecl
)
2716 || TREE_STATIC (olddecl
))
2718 /* Merge the section attribute.
2719 We want to issue an error if the sections conflict but that must be
2720 done later in decl_attributes since we are called before attributes
2722 if (DECL_SECTION_NAME (newdecl
) != NULL
)
2723 set_decl_section_name (olddecl
, DECL_SECTION_NAME (newdecl
));
2725 if (DECL_ONE_ONLY (newdecl
))
2727 struct symtab_node
*oldsym
, *newsym
;
2728 if (TREE_CODE (olddecl
) == FUNCTION_DECL
)
2729 oldsym
= cgraph_node::get_create (olddecl
);
2731 oldsym
= varpool_node::get_create (olddecl
);
2732 newsym
= symtab_node::get (newdecl
);
2733 oldsym
->set_comdat_group (newsym
->get_comdat_group ());
2738 && CP_DECL_THREAD_LOCAL_P (newdecl
))
2740 CP_DECL_THREAD_LOCAL_P (olddecl
) = true;
2741 if (!processing_template_decl
)
2742 set_decl_tls_model (olddecl
, DECL_TLS_MODEL (newdecl
));
2746 DECL_UID (olddecl
) = olddecl_uid
;
2748 DECL_FRIEND_P (olddecl
) = 1;
2751 DECL_ANTICIPATED (olddecl
) = 1;
2752 DECL_HIDDEN_FRIEND_P (olddecl
) = 1;
2755 /* NEWDECL contains the merged attribute lists.
2756 Update OLDDECL to be the same. */
2757 DECL_ATTRIBUTES (olddecl
) = DECL_ATTRIBUTES (newdecl
);
2759 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2760 so that encode_section_info has a chance to look at the new decl
2761 flags and attributes. */
2762 if (DECL_RTL_SET_P (olddecl
)
2763 && (TREE_CODE (olddecl
) == FUNCTION_DECL
2765 && TREE_STATIC (olddecl
))))
2766 make_decl_rtl (olddecl
);
2768 /* The NEWDECL will no longer be needed. Because every out-of-class
2769 declaration of a member results in a call to duplicate_decls,
2770 freeing these nodes represents in a significant savings.
2772 Before releasing the node, be sore to remove function from symbol
2773 table that might have been inserted there to record comdat group.
2774 Be sure to however do not free DECL_STRUCT_FUNCTION because this
2775 structure is shared in between newdecl and oldecl. */
2776 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2777 DECL_STRUCT_FUNCTION (newdecl
) = NULL
;
2778 if (VAR_OR_FUNCTION_DECL_P (newdecl
))
2780 struct symtab_node
*snode
= symtab_node::get (newdecl
);
2785 /* Remove the associated constraints for newdecl, if any, before
2786 reclaiming memory. */
2788 remove_constraints (newdecl
);
2795 /* Return zero if the declaration NEWDECL is valid
2796 when the declaration OLDDECL (assumed to be for the same name)
2797 has already been seen.
2798 Otherwise return an error message format string with a %s
2799 where the identifier should go. */
2802 redeclaration_error_message (tree newdecl
, tree olddecl
)
2804 if (TREE_CODE (newdecl
) == TYPE_DECL
)
2806 /* Because C++ can put things into name space for free,
2807 constructs like "typedef struct foo { ... } foo"
2808 would look like an erroneous redeclaration. */
2809 if (same_type_p (TREE_TYPE (newdecl
), TREE_TYPE (olddecl
)))
2812 return G_("redefinition of %q#D");
2814 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2816 /* If this is a pure function, its olddecl will actually be
2817 the original initialization to `0' (which we force to call
2818 abort()). Don't complain about redefinition in this case. */
2819 if (DECL_LANG_SPECIFIC (olddecl
) && DECL_PURE_VIRTUAL_P (olddecl
)
2820 && DECL_INITIAL (olddecl
) == NULL_TREE
)
2823 /* If both functions come from different namespaces, this is not
2824 a redeclaration - this is a conflict with a used function. */
2825 if (DECL_NAMESPACE_SCOPE_P (olddecl
)
2826 && DECL_CONTEXT (olddecl
) != DECL_CONTEXT (newdecl
)
2827 && ! decls_match (olddecl
, newdecl
))
2828 return G_("%qD conflicts with used function");
2830 /* We'll complain about linkage mismatches in
2831 warn_extern_redeclared_static. */
2833 /* Defining the same name twice is no good. */
2834 if (decl_defined_p (olddecl
)
2835 && decl_defined_p (newdecl
))
2837 if (DECL_NAME (olddecl
) == NULL_TREE
)
2838 return G_("%q#D not declared in class");
2839 else if (!GNU_INLINE_P (olddecl
)
2840 || GNU_INLINE_P (newdecl
))
2841 return G_("redefinition of %q#D");
2844 if (DECL_DECLARED_INLINE_P (olddecl
) && DECL_DECLARED_INLINE_P (newdecl
))
2846 bool olda
= GNU_INLINE_P (olddecl
);
2847 bool newa
= GNU_INLINE_P (newdecl
);
2852 return G_("%q+D redeclared inline with "
2853 "%<gnu_inline%> attribute");
2855 return G_("%q+D redeclared inline without "
2856 "%<gnu_inline%> attribute");
2860 check_abi_tag_redeclaration
2861 (olddecl
, lookup_attribute ("abi_tag", DECL_ATTRIBUTES (olddecl
)),
2862 lookup_attribute ("abi_tag", DECL_ATTRIBUTES (newdecl
)));
2866 else if (TREE_CODE (newdecl
) == TEMPLATE_DECL
)
2870 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl
)) == TYPE_DECL
)
2872 if (COMPLETE_TYPE_P (TREE_TYPE (newdecl
))
2873 && COMPLETE_TYPE_P (TREE_TYPE (olddecl
)))
2874 return G_("redefinition of %q#D");
2878 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl
)) != FUNCTION_DECL
2879 || (DECL_TEMPLATE_RESULT (newdecl
)
2880 == DECL_TEMPLATE_RESULT (olddecl
)))
2883 nt
= DECL_TEMPLATE_RESULT (newdecl
);
2884 if (DECL_TEMPLATE_INFO (nt
))
2885 nt
= DECL_TEMPLATE_RESULT (template_for_substitution (nt
));
2886 ot
= DECL_TEMPLATE_RESULT (olddecl
);
2887 if (DECL_TEMPLATE_INFO (ot
))
2888 ot
= DECL_TEMPLATE_RESULT (template_for_substitution (ot
));
2889 if (DECL_INITIAL (nt
) && DECL_INITIAL (ot
)
2890 && (!GNU_INLINE_P (ot
) || GNU_INLINE_P (nt
)))
2891 return G_("redefinition of %q#D");
2893 if (DECL_DECLARED_INLINE_P (ot
) && DECL_DECLARED_INLINE_P (nt
))
2895 bool olda
= GNU_INLINE_P (ot
);
2896 bool newa
= GNU_INLINE_P (nt
);
2901 return G_("%q+D redeclared inline with "
2902 "%<gnu_inline%> attribute");
2904 return G_("%q+D redeclared inline without "
2905 "%<gnu_inline%> attribute");
2909 /* Core issue #226 (C++0x):
2911 If a friend function template declaration specifies a
2912 default template-argument, that declaration shall be a
2913 definition and shall be the only declaration of the
2914 function template in the translation unit. */
2915 if ((cxx_dialect
!= cxx98
)
2916 && TREE_CODE (ot
) == FUNCTION_DECL
&& DECL_FRIEND_P (ot
)
2917 && !check_default_tmpl_args (nt
, DECL_TEMPLATE_PARMS (newdecl
),
2918 /*is_primary=*/true,
2919 /*is_partial=*/false,
2920 /*is_friend_decl=*/2))
2921 return G_("redeclaration of friend %q#D "
2922 "may not have default template arguments");
2926 else if (VAR_P (newdecl
)
2927 && CP_DECL_THREAD_LOCAL_P (newdecl
) != CP_DECL_THREAD_LOCAL_P (olddecl
)
2928 && (! DECL_LANG_SPECIFIC (olddecl
)
2929 || ! CP_DECL_THREADPRIVATE_P (olddecl
)
2930 || CP_DECL_THREAD_LOCAL_P (newdecl
)))
2932 /* Only variables can be thread-local, and all declarations must
2933 agree on this property. */
2934 if (CP_DECL_THREAD_LOCAL_P (newdecl
))
2935 return G_("thread-local declaration of %q#D follows "
2936 "non-thread-local declaration");
2938 return G_("non-thread-local declaration of %q#D follows "
2939 "thread-local declaration");
2941 else if (toplevel_bindings_p () || DECL_NAMESPACE_SCOPE_P (newdecl
))
2943 /* The objects have been declared at namespace scope. If either
2944 is a member of an anonymous union, then this is an invalid
2945 redeclaration. For example:
2951 if ((VAR_P (newdecl
) && DECL_ANON_UNION_VAR_P (newdecl
))
2952 || (VAR_P (olddecl
) && DECL_ANON_UNION_VAR_P (olddecl
)))
2953 return G_("redeclaration of %q#D");
2954 /* If at least one declaration is a reference, there is no
2955 conflict. For example:
2961 if (DECL_EXTERNAL (newdecl
) || DECL_EXTERNAL (olddecl
))
2964 /* Static data member declared outside a class definition
2965 if the variable is defined within the class with constexpr
2966 specifier is declaration rather than definition (and
2968 if (cxx_dialect
>= cxx17
2970 && DECL_CLASS_SCOPE_P (olddecl
)
2971 && DECL_DECLARED_CONSTEXPR_P (olddecl
)
2972 && !DECL_INITIAL (newdecl
))
2974 DECL_EXTERNAL (newdecl
) = 1;
2975 /* For now, only warn with explicit -Wdeprecated. */
2976 if (global_options_set
.x_warn_deprecated
)
2978 auto_diagnostic_group d
;
2979 if (warning_at (DECL_SOURCE_LOCATION (newdecl
), OPT_Wdeprecated
,
2980 "redundant redeclaration of %<constexpr%> "
2981 "static data member %qD", newdecl
))
2982 inform (DECL_SOURCE_LOCATION (olddecl
),
2983 "previous declaration of %qD", olddecl
);
2988 /* Reject two definitions. */
2989 return G_("redefinition of %q#D");
2993 /* Objects declared with block scope: */
2994 /* Reject two definitions, and reject a definition
2995 together with an external reference. */
2996 if (!(DECL_EXTERNAL (newdecl
) && DECL_EXTERNAL (olddecl
)))
2997 return G_("redeclaration of %q#D");
3003 /* Hash and equality functions for the named_label table. */
3006 named_label_hash::hash (const value_type entry
)
3008 return IDENTIFIER_HASH_VALUE (entry
->name
);
3012 named_label_hash::equal (const value_type entry
, compare_type name
)
3014 return name
== entry
->name
;
3017 /* Look for a label named ID in the current function. If one cannot
3018 be found, create one. Return the named_label_entry, or NULL on
3021 static named_label_entry
*
3022 lookup_label_1 (tree id
, bool making_local_p
)
3024 /* You can't use labels at global scope. */
3025 if (current_function_decl
== NULL_TREE
)
3027 error ("label %qE referenced outside of any function", id
);
3032 named_labels
= hash_table
<named_label_hash
>::create_ggc (13);
3034 hashval_t hash
= IDENTIFIER_HASH_VALUE (id
);
3035 named_label_entry
**slot
3036 = named_labels
->find_slot_with_hash (id
, hash
, INSERT
);
3037 named_label_entry
*old
= *slot
;
3039 if (old
&& old
->label_decl
)
3041 if (!making_local_p
)
3044 if (old
->binding_level
== current_binding_level
)
3046 error ("local label %qE conflicts with existing label", id
);
3047 inform (DECL_SOURCE_LOCATION (old
->label_decl
), "previous label");
3052 /* We are making a new decl, create or reuse the named_label_entry */
3053 named_label_entry
*ent
= NULL
;
3054 if (old
&& !old
->label_decl
)
3058 ent
= ggc_cleared_alloc
<named_label_entry
> ();
3064 /* Now create the LABEL_DECL. */
3065 tree decl
= build_decl (input_location
, LABEL_DECL
, id
, void_type_node
);
3067 DECL_CONTEXT (decl
) = current_function_decl
;
3068 SET_DECL_MODE (decl
, VOIDmode
);
3071 C_DECLARED_LABEL_FLAG (decl
) = true;
3072 DECL_CHAIN (decl
) = current_binding_level
->names
;
3073 current_binding_level
->names
= decl
;
3076 ent
->label_decl
= decl
;
3081 /* Wrapper for lookup_label_1. */
3084 lookup_label (tree id
)
3086 bool subtime
= timevar_cond_start (TV_NAME_LOOKUP
);
3087 named_label_entry
*ent
= lookup_label_1 (id
, false);
3088 timevar_cond_stop (TV_NAME_LOOKUP
, subtime
);
3089 return ent
? ent
->label_decl
: NULL_TREE
;
3093 declare_local_label (tree id
)
3095 bool subtime
= timevar_cond_start (TV_NAME_LOOKUP
);
3096 named_label_entry
*ent
= lookup_label_1 (id
, true);
3097 timevar_cond_stop (TV_NAME_LOOKUP
, subtime
);
3098 return ent
? ent
->label_decl
: NULL_TREE
;
3101 /* Returns nonzero if it is ill-formed to jump past the declaration of
3102 DECL. Returns 2 if it's also a real problem. */
3105 decl_jump_unsafe (tree decl
)
3107 /* [stmt.dcl]/3: A program that jumps from a point where a local variable
3108 with automatic storage duration is not in scope to a point where it is
3109 in scope is ill-formed unless the variable has scalar type, class type
3110 with a trivial default constructor and a trivial destructor, a
3111 cv-qualified version of one of these types, or an array of one of the
3112 preceding types and is declared without an initializer (8.5). */
3113 tree type
= TREE_TYPE (decl
);
3115 if (!VAR_P (decl
) || TREE_STATIC (decl
)
3116 || type
== error_mark_node
)
3119 if (DECL_NONTRIVIALLY_INITIALIZED_P (decl
)
3120 || variably_modified_type_p (type
, NULL_TREE
))
3123 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type
))
3129 /* A subroutine of check_previous_goto_1 and check_goto to identify a branch
3133 identify_goto (tree decl
, location_t loc
, const location_t
*locus
,
3134 diagnostic_t diag_kind
)
3137 = emit_diagnostic (diag_kind
, loc
, 0,
3138 decl
? N_("jump to label %qD")
3139 : N_("jump to case label"), decl
);
3140 if (complained
&& locus
)
3141 inform (*locus
, " from here");
3145 /* Check that a single previously seen jump to a newly defined label
3146 is OK. DECL is the LABEL_DECL or 0; LEVEL is the binding_level for
3147 the jump context; NAMES are the names in scope in LEVEL at the jump
3148 context; LOCUS is the source position of the jump or 0. Returns
3149 true if all is well. */
3152 check_previous_goto_1 (tree decl
, cp_binding_level
* level
, tree names
,
3153 bool exited_omp
, const location_t
*locus
)
3155 cp_binding_level
*b
;
3156 bool complained
= false;
3158 bool saw_eh
= false, saw_omp
= false, saw_tm
= false, saw_cxif
= false;
3162 complained
= identify_goto (decl
, input_location
, locus
, DK_ERROR
);
3164 inform (input_location
, " exits OpenMP structured block");
3169 for (b
= current_binding_level
; b
; b
= b
->level_chain
)
3171 tree new_decls
, old_decls
= (b
== level
? names
: NULL_TREE
);
3173 for (new_decls
= b
->names
; new_decls
!= old_decls
;
3174 new_decls
= (DECL_P (new_decls
) ? DECL_CHAIN (new_decls
)
3175 : TREE_CHAIN (new_decls
)))
3177 int problem
= decl_jump_unsafe (new_decls
);
3183 complained
= identify_goto (decl
, input_location
, locus
,
3185 ? DK_ERROR
: DK_PERMERROR
);
3191 inform (DECL_SOURCE_LOCATION (new_decls
),
3192 " crosses initialization of %q#D", new_decls
);
3194 inform (DECL_SOURCE_LOCATION (new_decls
),
3195 " enters scope of %q#D, which has "
3196 "non-trivial destructor", new_decls
);
3203 const char *inf
= NULL
;
3204 location_t loc
= input_location
;
3209 inf
= N_("enters try block");
3215 inf
= N_("enters catch block");
3221 inf
= N_("enters OpenMP structured block");
3225 case sk_transaction
:
3227 inf
= N_("enters synchronized or atomic statement");
3232 if (!saw_cxif
&& level_for_constexpr_if (b
->level_chain
))
3234 inf
= N_("enters constexpr if statement");
3235 loc
= EXPR_LOCATION (b
->level_chain
->this_entity
);
3247 complained
= identify_goto (decl
, input_location
, locus
, DK_ERROR
);
3250 inform (loc
, " %s", inf
);
3258 check_previous_goto (tree decl
, struct named_label_use_entry
*use
)
3260 check_previous_goto_1 (decl
, use
->binding_level
,
3261 use
->names_in_scope
, use
->in_omp_scope
,
3262 &use
->o_goto_locus
);
3266 check_switch_goto (cp_binding_level
* level
)
3268 return check_previous_goto_1 (NULL_TREE
, level
, level
->names
, false, NULL
);
3271 /* Check that a new jump to a label DECL is OK. Called by
3272 finish_goto_stmt. */
3275 check_goto (tree decl
)
3277 /* We can't know where a computed goto is jumping.
3278 So we assume that it's OK. */
3279 if (TREE_CODE (decl
) != LABEL_DECL
)
3282 /* We didn't record any information about this label when we created it,
3283 and there's not much point since it's trivial to analyze as a return. */
3284 if (decl
== cdtor_label
)
3287 hashval_t hash
= IDENTIFIER_HASH_VALUE (DECL_NAME (decl
));
3288 named_label_entry
**slot
3289 = named_labels
->find_slot_with_hash (DECL_NAME (decl
), hash
, NO_INSERT
);
3290 named_label_entry
*ent
= *slot
;
3292 /* If the label hasn't been defined yet, defer checking. */
3293 if (! DECL_INITIAL (decl
))
3295 /* Don't bother creating another use if the last goto had the
3296 same data, and will therefore create the same set of errors. */
3298 && ent
->uses
->names_in_scope
== current_binding_level
->names
)
3301 named_label_use_entry
*new_use
3302 = ggc_alloc
<named_label_use_entry
> ();
3303 new_use
->binding_level
= current_binding_level
;
3304 new_use
->names_in_scope
= current_binding_level
->names
;
3305 new_use
->o_goto_locus
= input_location
;
3306 new_use
->in_omp_scope
= false;
3308 new_use
->next
= ent
->uses
;
3309 ent
->uses
= new_use
;
3313 bool saw_catch
= false, complained
= false;
3318 if (ent
->in_try_scope
|| ent
->in_catch_scope
|| ent
->in_transaction_scope
3319 || ent
->in_constexpr_if
3320 || ent
->in_omp_scope
|| !vec_safe_is_empty (ent
->bad_decls
))
3322 diagnostic_t diag_kind
= DK_PERMERROR
;
3323 if (ent
->in_try_scope
|| ent
->in_catch_scope
|| ent
->in_constexpr_if
3324 || ent
->in_transaction_scope
|| ent
->in_omp_scope
)
3325 diag_kind
= DK_ERROR
;
3326 complained
= identify_goto (decl
, DECL_SOURCE_LOCATION (decl
),
3327 &input_location
, diag_kind
);
3328 identified
= 1 + (diag_kind
== DK_ERROR
);
3331 FOR_EACH_VEC_SAFE_ELT (ent
->bad_decls
, ix
, bad
)
3333 int u
= decl_jump_unsafe (bad
);
3335 if (u
> 1 && DECL_ARTIFICIAL (bad
))
3337 /* Can't skip init of __exception_info. */
3338 if (identified
== 1)
3340 complained
= identify_goto (decl
, DECL_SOURCE_LOCATION (decl
),
3341 &input_location
, DK_ERROR
);
3345 inform (DECL_SOURCE_LOCATION (bad
), " enters catch block");
3348 else if (complained
)
3351 inform (DECL_SOURCE_LOCATION (bad
),
3352 " skips initialization of %q#D", bad
);
3354 inform (DECL_SOURCE_LOCATION (bad
),
3355 " enters scope of %q#D which has "
3356 "non-trivial destructor", bad
);
3362 if (ent
->in_try_scope
)
3363 inform (input_location
, " enters try block");
3364 else if (ent
->in_catch_scope
&& !saw_catch
)
3365 inform (input_location
, " enters catch block");
3366 else if (ent
->in_transaction_scope
)
3367 inform (input_location
, " enters synchronized or atomic statement");
3368 else if (ent
->in_constexpr_if
)
3369 inform (input_location
, " enters %<constexpr%> if statement");
3372 if (ent
->in_omp_scope
)
3375 inform (input_location
, " enters OpenMP structured block");
3377 else if (flag_openmp
)
3378 for (cp_binding_level
*b
= current_binding_level
; b
; b
= b
->level_chain
)
3380 if (b
== ent
->binding_level
)
3382 if (b
->kind
== sk_omp
)
3386 complained
= identify_goto (decl
,
3387 DECL_SOURCE_LOCATION (decl
),
3388 &input_location
, DK_ERROR
);
3392 inform (input_location
, " exits OpenMP structured block");
3398 /* Check that a return is ok wrt OpenMP structured blocks.
3399 Called by finish_return_stmt. Returns true if all is well. */
3402 check_omp_return (void)
3404 for (cp_binding_level
*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 /* After labels, make any new cleanups in the function go into their
3422 own new (temporary) binding contour. */
3423 for (cp_binding_level
*p
= current_binding_level
;
3424 p
->kind
!= sk_function_parms
;
3426 p
->more_cleanups_ok
= 0;
3428 named_label_entry
*ent
= lookup_label_1 (name
, false);
3429 tree decl
= ent
->label_decl
;
3431 if (DECL_INITIAL (decl
) != NULL_TREE
)
3433 error ("duplicate label %qD", decl
);
3434 return error_mark_node
;
3438 /* Mark label as having been defined. */
3439 DECL_INITIAL (decl
) = error_mark_node
;
3440 /* Say where in the source. */
3441 DECL_SOURCE_LOCATION (decl
) = location
;
3443 ent
->binding_level
= current_binding_level
;
3444 ent
->names_in_scope
= current_binding_level
->names
;
3446 for (named_label_use_entry
*use
= ent
->uses
; use
; use
= use
->next
)
3447 check_previous_goto (decl
, use
);
3454 /* Wrapper for define_label_1. */
3457 define_label (location_t location
, tree name
)
3459 bool running
= timevar_cond_start (TV_NAME_LOOKUP
);
3460 tree ret
= define_label_1 (location
, name
);
3461 timevar_cond_stop (TV_NAME_LOOKUP
, running
);
3468 cp_binding_level
*level
;
3469 struct cp_switch
*next
;
3470 /* The SWITCH_STMT being built. */
3472 /* A splay-tree mapping the low element of a case range to the high
3473 element, or NULL_TREE if there is no high element. Used to
3474 determine whether or not a new case label duplicates an old case
3475 label. We need a tree, rather than simply a hash table, because
3476 of the GNU case range extension. */
3478 /* Remember whether there was a case value that is outside the
3479 range of the original type of the controlling expression. */
3480 bool outside_range_p
;
3481 /* Remember whether a default: case label has been seen. */
3483 /* Remember whether a BREAK_STMT has been seen in this SWITCH_STMT. */
3484 bool break_stmt_seen_p
;
3485 /* Set if inside of {FOR,DO,WHILE}_BODY nested inside of a switch,
3486 where BREAK_STMT doesn't belong to the SWITCH_STMT. */
3487 bool in_loop_body_p
;
3490 /* A stack of the currently active switch statements. The innermost
3491 switch statement is on the top of the stack. There is no need to
3492 mark the stack for garbage collection because it is only active
3493 during the processing of the body of a function, and we never
3494 collect at that point. */
3496 static struct cp_switch
*switch_stack
;
3498 /* Called right after a switch-statement condition is parsed.
3499 SWITCH_STMT is the switch statement being parsed. */
3502 push_switch (tree switch_stmt
)
3504 struct cp_switch
*p
= XNEW (struct cp_switch
);
3505 p
->level
= current_binding_level
;
3506 p
->next
= switch_stack
;
3507 p
->switch_stmt
= switch_stmt
;
3508 p
->cases
= splay_tree_new (case_compare
, NULL
, NULL
);
3509 p
->outside_range_p
= false;
3510 p
->has_default_p
= false;
3511 p
->break_stmt_seen_p
= false;
3512 p
->in_loop_body_p
= false;
3519 struct cp_switch
*cs
= switch_stack
;
3520 location_t switch_location
;
3522 /* Emit warnings as needed. */
3523 switch_location
= cp_expr_loc_or_loc (cs
->switch_stmt
, input_location
);
3524 const bool bool_cond_p
3525 = (SWITCH_STMT_TYPE (cs
->switch_stmt
)
3526 && TREE_CODE (SWITCH_STMT_TYPE (cs
->switch_stmt
)) == BOOLEAN_TYPE
);
3527 if (!processing_template_decl
)
3528 c_do_switch_warnings (cs
->cases
, switch_location
,
3529 SWITCH_STMT_TYPE (cs
->switch_stmt
),
3530 SWITCH_STMT_COND (cs
->switch_stmt
),
3531 bool_cond_p
, cs
->outside_range_p
);
3533 /* For the benefit of block_may_fallthru remember if the switch body
3534 case labels cover all possible values and if there are break; stmts. */
3535 if (cs
->has_default_p
3536 || (!processing_template_decl
3537 && c_switch_covers_all_cases_p (cs
->cases
,
3538 SWITCH_STMT_TYPE (cs
->switch_stmt
))))
3539 SWITCH_STMT_ALL_CASES_P (cs
->switch_stmt
) = 1;
3540 if (!cs
->break_stmt_seen_p
)
3541 SWITCH_STMT_NO_BREAK_P (cs
->switch_stmt
) = 1;
3542 gcc_assert (!cs
->in_loop_body_p
);
3543 splay_tree_delete (cs
->cases
);
3544 switch_stack
= switch_stack
->next
;
3548 /* Note that a BREAK_STMT is about to be added. If it is inside of
3549 a SWITCH_STMT and not inside of a loop body inside of it, note
3550 in switch_stack we've seen a BREAK_STMT. */
3553 note_break_stmt (void)
3555 if (switch_stack
&& !switch_stack
->in_loop_body_p
)
3556 switch_stack
->break_stmt_seen_p
= true;
3559 /* Note the start of processing of an iteration statement's body.
3560 The note_break_stmt function will do nothing while processing it.
3561 Return a flag that should be passed to note_iteration_stmt_body_end. */
3564 note_iteration_stmt_body_start (void)
3568 bool ret
= switch_stack
->in_loop_body_p
;
3569 switch_stack
->in_loop_body_p
= true;
3573 /* Note the end of processing of an iteration statement's body. */
3576 note_iteration_stmt_body_end (bool prev
)
3579 switch_stack
->in_loop_body_p
= prev
;
3582 /* Convert a case constant VALUE in a switch to the type TYPE of the switch
3583 condition. Note that if TYPE and VALUE are already integral we don't
3584 really do the conversion because the language-independent
3585 warning/optimization code will work better that way. */
3588 case_conversion (tree type
, tree value
)
3590 if (value
== NULL_TREE
)
3593 value
= mark_rvalue_use (value
);
3595 if (cxx_dialect
>= cxx11
3596 && (SCOPED_ENUM_P (type
)
3597 || !INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (value
))))
3599 if (INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type
))
3600 type
= type_promotes_to (type
);
3601 value
= (perform_implicit_conversion_flags
3602 (type
, value
, tf_warning_or_error
,
3603 LOOKUP_IMPLICIT
| LOOKUP_NO_NON_INTEGRAL
));
3605 return cxx_constant_value (value
);
3608 /* Note that we've seen a definition of a case label, and complain if this
3609 is a bad place for one. */
3612 finish_case_label (location_t loc
, tree low_value
, tree high_value
)
3615 cp_binding_level
*p
;
3618 if (low_value
== NULL_TREE
&& high_value
== NULL_TREE
)
3619 switch_stack
->has_default_p
= true;
3621 if (processing_template_decl
)
3625 /* For templates, just add the case label; we'll do semantic
3626 analysis at instantiation-time. */
3627 label
= build_decl (loc
, LABEL_DECL
, NULL_TREE
, void_type_node
);
3628 return add_stmt (build_case_label (low_value
, high_value
, label
));
3631 /* Find the condition on which this switch statement depends. */
3632 cond
= SWITCH_STMT_COND (switch_stack
->switch_stmt
);
3633 if (cond
&& TREE_CODE (cond
) == TREE_LIST
)
3634 cond
= TREE_VALUE (cond
);
3636 if (!check_switch_goto (switch_stack
->level
))
3637 return error_mark_node
;
3639 type
= SWITCH_STMT_TYPE (switch_stack
->switch_stmt
);
3640 if (type
== error_mark_node
)
3641 return error_mark_node
;
3643 low_value
= case_conversion (type
, low_value
);
3644 high_value
= case_conversion (type
, high_value
);
3646 r
= c_add_case_label (loc
, switch_stack
->cases
, cond
, type
,
3647 low_value
, high_value
,
3648 &switch_stack
->outside_range_p
);
3650 /* After labels, make any new cleanups in the function go into their
3651 own new (temporary) binding contour. */
3652 for (p
= current_binding_level
;
3653 p
->kind
!= sk_function_parms
;
3655 p
->more_cleanups_ok
= 0;
3660 struct typename_info
{
3668 struct typename_hasher
: ggc_ptr_hash
<tree_node
>
3670 typedef typename_info
*compare_type
;
3672 /* Hash a TYPENAME_TYPE. */
3679 hash
= (htab_hash_pointer (TYPE_CONTEXT (t
))
3680 ^ htab_hash_pointer (TYPE_IDENTIFIER (t
)));
3685 /* Compare two TYPENAME_TYPEs. */
3688 equal (tree t1
, const typename_info
*t2
)
3690 return (TYPE_IDENTIFIER (t1
) == t2
->name
3691 && TYPE_CONTEXT (t1
) == t2
->scope
3692 && TYPENAME_TYPE_FULLNAME (t1
) == t2
->template_id
3693 && TYPENAME_IS_ENUM_P (t1
) == t2
->enum_p
3694 && TYPENAME_IS_CLASS_P (t1
) == t2
->class_p
);
3698 /* Build a TYPENAME_TYPE. If the type is `typename T::t', CONTEXT is
3699 the type of `T', NAME is the IDENTIFIER_NODE for `t'.
3701 Returns the new TYPENAME_TYPE. */
3703 static GTY (()) hash_table
<typename_hasher
> *typename_htab
;
3706 build_typename_type (tree context
, tree name
, tree fullname
,
3707 enum tag_types tag_type
)
3715 if (typename_htab
== NULL
)
3716 typename_htab
= hash_table
<typename_hasher
>::create_ggc (61);
3718 ti
.scope
= FROB_CONTEXT (context
);
3720 ti
.template_id
= fullname
;
3721 ti
.enum_p
= tag_type
== enum_type
;
3722 ti
.class_p
= (tag_type
== class_type
3723 || tag_type
== record_type
3724 || tag_type
== union_type
);
3725 hash
= (htab_hash_pointer (ti
.scope
)
3726 ^ htab_hash_pointer (ti
.name
));
3728 /* See if we already have this type. */
3729 e
= typename_htab
->find_slot_with_hash (&ti
, hash
, INSERT
);
3734 /* Build the TYPENAME_TYPE. */
3735 t
= cxx_make_type (TYPENAME_TYPE
);
3736 TYPE_CONTEXT (t
) = ti
.scope
;
3737 TYPENAME_TYPE_FULLNAME (t
) = ti
.template_id
;
3738 TYPENAME_IS_ENUM_P (t
) = ti
.enum_p
;
3739 TYPENAME_IS_CLASS_P (t
) = ti
.class_p
;
3741 /* Build the corresponding TYPE_DECL. */
3742 d
= build_decl (input_location
, TYPE_DECL
, name
, t
);
3743 TYPE_NAME (TREE_TYPE (d
)) = d
;
3744 TYPE_STUB_DECL (TREE_TYPE (d
)) = d
;
3745 DECL_CONTEXT (d
) = FROB_CONTEXT (context
);
3746 DECL_ARTIFICIAL (d
) = 1;
3748 /* Store it in the hash table. */
3751 /* TYPENAME_TYPEs must always be compared structurally, because
3752 they may or may not resolve down to another type depending on
3753 the currently open classes. */
3754 SET_TYPE_STRUCTURAL_EQUALITY (t
);
3760 /* Resolve `typename CONTEXT::NAME'. TAG_TYPE indicates the tag
3761 provided to name the type. Returns an appropriate type, unless an
3762 error occurs, in which case error_mark_node is returned. If we
3763 locate a non-artificial TYPE_DECL and TF_KEEP_TYPE_DECL is set, we
3764 return that, rather than the _TYPE it corresponds to, in other
3765 cases we look through the type decl. If TF_ERROR is set, complain
3766 about errors, otherwise be quiet. */
3769 make_typename_type (tree context
, tree name
, enum tag_types tag_type
,
3770 tsubst_flags_t complain
)
3776 if (name
== error_mark_node
3777 || context
== NULL_TREE
3778 || context
== error_mark_node
)
3779 return error_mark_node
;
3783 if (!(TYPE_LANG_SPECIFIC (name
)
3784 && (CLASSTYPE_IS_TEMPLATE (name
)
3785 || CLASSTYPE_USE_TEMPLATE (name
))))
3786 name
= TYPE_IDENTIFIER (name
);
3788 /* Create a TEMPLATE_ID_EXPR for the type. */
3789 name
= build_nt (TEMPLATE_ID_EXPR
,
3790 CLASSTYPE_TI_TEMPLATE (name
),
3791 CLASSTYPE_TI_ARGS (name
));
3793 else if (TREE_CODE (name
) == TYPE_DECL
)
3794 name
= DECL_NAME (name
);
3798 if (TREE_CODE (name
) == TEMPLATE_ID_EXPR
)
3800 name
= TREE_OPERAND (name
, 0);
3801 if (DECL_TYPE_TEMPLATE_P (name
))
3802 name
= TREE_OPERAND (fullname
, 0) = DECL_NAME (name
);
3803 if (TREE_CODE (name
) != IDENTIFIER_NODE
)
3805 if (complain
& tf_error
)
3806 error ("%qD is not a type", name
);
3807 return error_mark_node
;
3810 if (TREE_CODE (name
) == TEMPLATE_DECL
)
3812 if (complain
& tf_error
)
3813 error ("%qD used without template arguments", name
);
3814 return error_mark_node
;
3816 gcc_assert (identifier_p (name
));
3817 gcc_assert (TYPE_P (context
));
3819 if (!MAYBE_CLASS_TYPE_P (context
))
3821 if (complain
& tf_error
)
3822 error ("%q#T is not a class", context
);
3823 return error_mark_node
;
3826 /* When the CONTEXT is a dependent type, NAME could refer to a
3827 dependent base class of CONTEXT. But look inside it anyway
3828 if CONTEXT is a currently open scope, in case it refers to a
3829 member of the current instantiation or a non-dependent base;
3830 lookup will stop when we hit a dependent base. */
3831 if (!dependent_scope_p (context
))
3832 /* We should only set WANT_TYPE when we're a nested typename type.
3833 Then we can give better diagnostics if we find a non-type. */
3834 t
= lookup_field (context
, name
, 2, /*want_type=*/true);
3838 if ((!t
|| TREE_CODE (t
) == TREE_LIST
) && dependent_type_p (context
))
3839 return build_typename_type (context
, name
, fullname
, tag_type
);
3841 want_template
= TREE_CODE (fullname
) == TEMPLATE_ID_EXPR
;
3845 if (complain
& tf_error
)
3847 if (!COMPLETE_TYPE_P (context
))
3848 cxx_incomplete_type_error (NULL_TREE
, context
);
3850 error (want_template
? G_("no class template named %q#T in %q#T")
3851 : G_("no type named %q#T in %q#T"), name
, context
);
3853 return error_mark_node
;
3856 /* Pull out the template from an injected-class-name (or multiple). */
3858 t
= maybe_get_template_decl_from_type_decl (t
);
3860 if (TREE_CODE (t
) == TREE_LIST
)
3862 if (complain
& tf_error
)
3864 error ("lookup of %qT in %qT is ambiguous", name
, context
);
3865 print_candidates (t
);
3867 return error_mark_node
;
3870 if (want_template
&& !DECL_TYPE_TEMPLATE_P (t
))
3872 if (complain
& tf_error
)
3873 error ("%<typename %T::%D%> names %q#T, which is not a class template",
3875 return error_mark_node
;
3877 if (!want_template
&& TREE_CODE (t
) != TYPE_DECL
)
3879 if (complain
& tf_error
)
3880 error ("%<typename %T::%D%> names %q#T, which is not a type",
3882 return error_mark_node
;
3885 if (!perform_or_defer_access_check (TYPE_BINFO (context
), t
, t
, complain
))
3886 return error_mark_node
;
3888 /* If we are currently parsing a template and if T is a typedef accessed
3889 through CONTEXT then we need to remember and check access of T at
3890 template instantiation time. */
3891 add_typedef_to_current_template_for_access_check (t
, context
, input_location
);
3894 return lookup_template_class (t
, TREE_OPERAND (fullname
, 1),
3896 /*entering_scope=*/0,
3897 complain
| tf_user
);
3899 if (DECL_ARTIFICIAL (t
) || !(complain
& tf_keep_type_decl
))
3902 maybe_record_typedef_use (t
);
3907 /* Resolve `CONTEXT::template NAME'. Returns a TEMPLATE_DECL if the name
3908 can be resolved or an UNBOUND_CLASS_TEMPLATE, unless an error occurs,
3909 in which case error_mark_node is returned.
3911 If PARM_LIST is non-NULL, also make sure that the template parameter
3912 list of TEMPLATE_DECL matches.
3914 If COMPLAIN zero, don't complain about any errors that occur. */
3917 make_unbound_class_template (tree context
, tree name
, tree parm_list
,
3918 tsubst_flags_t complain
)
3924 name
= TYPE_IDENTIFIER (name
);
3925 else if (DECL_P (name
))
3926 name
= DECL_NAME (name
);
3927 gcc_assert (identifier_p (name
));
3929 if (!dependent_type_p (context
)
3930 || currently_open_class (context
))
3932 tree tmpl
= NULL_TREE
;
3934 if (MAYBE_CLASS_TYPE_P (context
))
3935 tmpl
= lookup_field (context
, name
, 0, false);
3937 if (tmpl
&& TREE_CODE (tmpl
) == TYPE_DECL
)
3938 tmpl
= maybe_get_template_decl_from_type_decl (tmpl
);
3940 if (!tmpl
|| !DECL_TYPE_TEMPLATE_P (tmpl
))
3942 if (complain
& tf_error
)
3943 error ("no class template named %q#T in %q#T", name
, context
);
3944 return error_mark_node
;
3948 && !comp_template_parms (DECL_TEMPLATE_PARMS (tmpl
), parm_list
))
3950 if (complain
& tf_error
)
3952 error ("template parameters do not match template %qD", tmpl
);
3953 inform (DECL_SOURCE_LOCATION (tmpl
),
3954 "%qD declared here", tmpl
);
3956 return error_mark_node
;
3959 if (!perform_or_defer_access_check (TYPE_BINFO (context
), tmpl
, tmpl
,
3961 return error_mark_node
;
3966 /* Build the UNBOUND_CLASS_TEMPLATE. */
3967 t
= cxx_make_type (UNBOUND_CLASS_TEMPLATE
);
3968 TYPE_CONTEXT (t
) = FROB_CONTEXT (context
);
3969 TREE_TYPE (t
) = NULL_TREE
;
3970 SET_TYPE_STRUCTURAL_EQUALITY (t
);
3972 /* Build the corresponding TEMPLATE_DECL. */
3973 d
= build_decl (input_location
, TEMPLATE_DECL
, name
, t
);
3974 TYPE_NAME (TREE_TYPE (d
)) = d
;
3975 TYPE_STUB_DECL (TREE_TYPE (d
)) = d
;
3976 DECL_CONTEXT (d
) = FROB_CONTEXT (context
);
3977 DECL_ARTIFICIAL (d
) = 1;
3978 DECL_TEMPLATE_PARMS (d
) = parm_list
;
3985 /* Push the declarations of builtin types into the global namespace.
3986 RID_INDEX is the index of the builtin type in the array
3987 RID_POINTERS. NAME is the name used when looking up the builtin
3988 type. TYPE is the _TYPE node for the builtin type.
3990 The calls to set_global_binding below should be
3991 eliminated. Built-in types should not be looked up name; their
3992 names are keywords that the parser can recognize. However, there
3993 is code in c-common.c that uses identifier_global_value to look up
3994 built-in types by name. */
3997 record_builtin_type (enum rid rid_index
,
4001 tree decl
= NULL_TREE
;
4005 tree tname
= get_identifier (name
);
4006 tree tdecl
= build_decl (BUILTINS_LOCATION
, TYPE_DECL
, tname
, type
);
4007 DECL_ARTIFICIAL (tdecl
) = 1;
4008 set_global_binding (tdecl
);
4012 if ((int) rid_index
< (int) RID_MAX
)
4013 if (tree rname
= ridpointers
[(int) rid_index
])
4014 if (!decl
|| DECL_NAME (decl
) != rname
)
4016 tree rdecl
= build_decl (BUILTINS_LOCATION
, TYPE_DECL
, rname
, type
);
4017 DECL_ARTIFICIAL (rdecl
) = 1;
4018 set_global_binding (rdecl
);
4025 if (!TYPE_NAME (type
))
4026 TYPE_NAME (type
) = decl
;
4027 debug_hooks
->type_decl (decl
, 0);
4031 /* Push a type into the namespace so that the back ends ignore it. */
4034 record_unknown_type (tree type
, const char* name
)
4036 tree decl
= pushdecl (build_decl (UNKNOWN_LOCATION
,
4037 TYPE_DECL
, get_identifier (name
), type
));
4038 /* Make sure the "unknown type" typedecl gets ignored for debug info. */
4039 DECL_IGNORED_P (decl
) = 1;
4040 TYPE_DECL_SUPPRESS_DEBUG (decl
) = 1;
4041 TYPE_SIZE (type
) = TYPE_SIZE (void_type_node
);
4042 SET_TYPE_ALIGN (type
, 1);
4043 TYPE_USER_ALIGN (type
) = 0;
4044 SET_TYPE_MODE (type
, TYPE_MODE (void_type_node
));
4047 /* Create all the predefined identifiers. */
4050 initialize_predefined_identifiers (void)
4052 struct predefined_identifier
4054 const char *name
; /* Name. */
4055 tree
*node
; /* Node to store it in. */
4056 cp_identifier_kind kind
; /* Kind of identifier. */
4059 /* A table of identifiers to create at startup. */
4060 static const predefined_identifier predefined_identifiers
[] = {
4061 {"C++", &lang_name_cplusplus
, cik_normal
},
4062 {"C", &lang_name_c
, cik_normal
},
4063 /* Some of these names have a trailing space so that it is
4064 impossible for them to conflict with names written by users. */
4065 {"__ct ", &ctor_identifier
, cik_ctor
},
4066 {"__ct_base ", &base_ctor_identifier
, cik_ctor
},
4067 {"__ct_comp ", &complete_ctor_identifier
, cik_ctor
},
4068 {"__dt ", &dtor_identifier
, cik_dtor
},
4069 {"__dt_base ", &base_dtor_identifier
, cik_dtor
},
4070 {"__dt_comp ", &complete_dtor_identifier
, cik_dtor
},
4071 {"__dt_del ", &deleting_dtor_identifier
, cik_dtor
},
4072 {"__conv_op ", &conv_op_identifier
, cik_conv_op
},
4073 {"__in_chrg", &in_charge_identifier
, cik_normal
},
4074 {"this", &this_identifier
, cik_normal
},
4075 {"__delta", &delta_identifier
, cik_normal
},
4076 {"__pfn", &pfn_identifier
, cik_normal
},
4077 {"_vptr", &vptr_identifier
, cik_normal
},
4078 {"__vtt_parm", &vtt_parm_identifier
, cik_normal
},
4079 {"::", &global_identifier
, cik_normal
},
4080 {"std", &std_identifier
, cik_normal
},
4081 /* The demangler expects anonymous namespaces to be called
4082 something starting with '_GLOBAL__N_'. It no longer needs
4083 to be unique to the TU. */
4084 {"_GLOBAL__N_1", &anon_identifier
, cik_normal
},
4085 {"auto", &auto_identifier
, cik_normal
},
4086 {"decltype(auto)", &decltype_auto_identifier
, cik_normal
},
4087 {"initializer_list", &init_list_identifier
, cik_normal
},
4088 {"__for_range ", &for_range__identifier
, cik_normal
},
4089 {"__for_begin ", &for_begin__identifier
, cik_normal
},
4090 {"__for_end ", &for_end__identifier
, cik_normal
},
4091 {"__for_range", &for_range_identifier
, cik_normal
},
4092 {"__for_begin", &for_begin_identifier
, cik_normal
},
4093 {"__for_end", &for_end_identifier
, cik_normal
},
4094 {"abi_tag", &abi_tag_identifier
, cik_normal
},
4095 {"aligned", &aligned_identifier
, cik_normal
},
4096 {"begin", &begin_identifier
, cik_normal
},
4097 {"end", &end_identifier
, cik_normal
},
4098 {"get", &get__identifier
, cik_normal
},
4099 {"gnu", &gnu_identifier
, cik_normal
},
4100 {"tuple_element", &tuple_element_identifier
, cik_normal
},
4101 {"tuple_size", &tuple_size_identifier
, cik_normal
},
4102 {"type", &type_identifier
, cik_normal
},
4103 {"value", &value_identifier
, cik_normal
},
4104 {"_FUN", &fun_identifier
, cik_normal
},
4105 {"__closure", &closure_identifier
, cik_normal
},
4106 {NULL
, NULL
, cik_normal
}
4109 for (const predefined_identifier
*pid
= predefined_identifiers
;
4112 *pid
->node
= get_identifier (pid
->name
);
4113 /* Some of these identifiers already have a special kind. */
4114 if (pid
->kind
!= cik_normal
)
4115 set_identifier_kind (*pid
->node
, pid
->kind
);
4119 /* Create the predefined scalar types of C,
4120 and some nodes representing standard constants (0, 1, (void *)0).
4121 Initialize the global binding level.
4122 Make definitions for built-in primitive functions. */
4125 cxx_init_decl_processing (void)
4128 tree void_ftype_ptr
;
4130 /* Create all the identifiers we need. */
4131 initialize_predefined_identifiers ();
4133 /* Create the global variables. */
4134 push_to_top_level ();
4136 current_function_decl
= NULL_TREE
;
4137 current_binding_level
= NULL
;
4138 /* Enter the global namespace. */
4139 gcc_assert (global_namespace
== NULL_TREE
);
4140 global_namespace
= build_lang_decl (NAMESPACE_DECL
, global_identifier
,
4142 TREE_PUBLIC (global_namespace
) = 1;
4143 DECL_CONTEXT (global_namespace
)
4144 = build_translation_unit_decl (get_identifier (main_input_filename
));
4145 /* Remember whether we want the empty class passing ABI change warning
4147 TRANSLATION_UNIT_WARN_EMPTY_P (DECL_CONTEXT (global_namespace
))
4148 = warn_abi
&& abi_version_crosses (12);
4149 debug_hooks
->register_main_translation_unit
4150 (DECL_CONTEXT (global_namespace
));
4151 begin_scope (sk_namespace
, global_namespace
);
4152 current_namespace
= global_namespace
;
4154 if (flag_visibility_ms_compat
)
4155 default_visibility
= VISIBILITY_HIDDEN
;
4158 current_lang_name
= lang_name_c
;
4160 /* Create the `std' namespace. */
4161 push_namespace (std_identifier
);
4162 std_node
= current_namespace
;
4165 flag_noexcept_type
= (cxx_dialect
>= cxx17
);
4167 c_common_nodes_and_builtins ();
4169 tree bool_ftype
= build_function_type_list (boolean_type_node
, NULL_TREE
);
4171 = add_builtin_function ("__builtin_is_constant_evaluated",
4172 bool_ftype
, CP_BUILT_IN_IS_CONSTANT_EVALUATED
,
4173 BUILT_IN_FRONTEND
, NULL
, NULL_TREE
);
4174 set_call_expr_flags (decl
, ECF_CONST
| ECF_NOTHROW
| ECF_LEAF
);
4176 integer_two_node
= build_int_cst (NULL_TREE
, 2);
4178 /* Guess at the initial static decls size. */
4179 vec_alloc (static_decls
, 500);
4181 /* ... and keyed classes. */
4182 vec_alloc (keyed_classes
, 100);
4184 record_builtin_type (RID_BOOL
, "bool", boolean_type_node
);
4185 truthvalue_type_node
= boolean_type_node
;
4186 truthvalue_false_node
= boolean_false_node
;
4187 truthvalue_true_node
= boolean_true_node
;
4189 empty_except_spec
= build_tree_list (NULL_TREE
, NULL_TREE
);
4190 noexcept_true_spec
= build_tree_list (boolean_true_node
, NULL_TREE
);
4191 noexcept_false_spec
= build_tree_list (boolean_false_node
, NULL_TREE
);
4192 noexcept_deferred_spec
= build_tree_list (make_node (DEFERRED_NOEXCEPT
),
4196 record_builtin_type (RID_MAX
, NULL
, string_type_node
);
4199 delta_type_node
= ptrdiff_type_node
;
4200 vtable_index_type
= ptrdiff_type_node
;
4202 vtt_parm_type
= build_pointer_type (const_ptr_type_node
);
4203 void_ftype
= build_function_type_list (void_type_node
, NULL_TREE
);
4204 void_ftype_ptr
= build_function_type_list (void_type_node
,
4205 ptr_type_node
, NULL_TREE
);
4207 = build_exception_variant (void_ftype_ptr
, empty_except_spec
);
4209 /* Create the conversion operator marker. This operator's DECL_NAME
4210 is in the identifier table, so we can use identifier equality to
4212 conv_op_marker
= build_lang_decl (FUNCTION_DECL
, conv_op_identifier
,
4215 /* C++ extensions */
4217 unknown_type_node
= make_node (LANG_TYPE
);
4218 record_unknown_type (unknown_type_node
, "unknown type");
4220 /* Indirecting an UNKNOWN_TYPE node yields an UNKNOWN_TYPE node. */
4221 TREE_TYPE (unknown_type_node
) = unknown_type_node
;
4223 /* Looking up TYPE_POINTER_TO and TYPE_REFERENCE_TO yield the same
4225 TYPE_POINTER_TO (unknown_type_node
) = unknown_type_node
;
4226 TYPE_REFERENCE_TO (unknown_type_node
) = unknown_type_node
;
4228 init_list_type_node
= make_node (LANG_TYPE
);
4229 record_unknown_type (init_list_type_node
, "init list");
4232 /* Make sure we get a unique function type, so we can give
4233 its pointer type a name. (This wins for gdb.) */
4234 tree vfunc_type
= make_node (FUNCTION_TYPE
);
4235 TREE_TYPE (vfunc_type
) = integer_type_node
;
4236 TYPE_ARG_TYPES (vfunc_type
) = NULL_TREE
;
4237 layout_type (vfunc_type
);
4239 vtable_entry_type
= build_pointer_type (vfunc_type
);
4241 record_builtin_type (RID_MAX
, "__vtbl_ptr_type", vtable_entry_type
);
4244 = build_cplus_array_type (vtable_entry_type
, NULL_TREE
);
4245 layout_type (vtbl_type_node
);
4246 vtbl_type_node
= cp_build_qualified_type (vtbl_type_node
, TYPE_QUAL_CONST
);
4247 record_builtin_type (RID_MAX
, NULL
, vtbl_type_node
);
4248 vtbl_ptr_type_node
= build_pointer_type (vtable_entry_type
);
4249 layout_type (vtbl_ptr_type_node
);
4250 record_builtin_type (RID_MAX
, NULL
, vtbl_ptr_type_node
);
4252 push_namespace (get_identifier ("__cxxabiv1"));
4253 abi_node
= current_namespace
;
4256 global_type_node
= make_node (LANG_TYPE
);
4257 record_unknown_type (global_type_node
, "global type");
4259 any_targ_node
= make_node (LANG_TYPE
);
4260 record_unknown_type (any_targ_node
, "any type");
4263 current_lang_name
= lang_name_cplusplus
;
4265 if (aligned_new_threshold
> 1
4266 && !pow2p_hwi (aligned_new_threshold
))
4268 error ("-faligned-new=%d is not a power of two", aligned_new_threshold
);
4269 aligned_new_threshold
= 1;
4271 if (aligned_new_threshold
== -1)
4272 aligned_new_threshold
= (cxx_dialect
>= cxx17
) ? 1 : 0;
4273 if (aligned_new_threshold
== 1)
4274 aligned_new_threshold
= malloc_alignment () / BITS_PER_UNIT
;
4277 tree newattrs
, extvisattr
;
4278 tree newtype
, deltype
;
4279 tree ptr_ftype_sizetype
;
4283 = build_function_type_list (ptr_type_node
, size_type_node
, NULL_TREE
);
4284 if (cxx_dialect
== cxx98
)
4287 tree bad_alloc_type_node
;
4288 tree bad_alloc_decl
;
4290 push_namespace (std_identifier
);
4291 bad_alloc_id
= get_identifier ("bad_alloc");
4292 bad_alloc_type_node
= make_class_type (RECORD_TYPE
);
4293 TYPE_CONTEXT (bad_alloc_type_node
) = current_namespace
;
4295 = create_implicit_typedef (bad_alloc_id
, bad_alloc_type_node
);
4296 DECL_CONTEXT (bad_alloc_decl
) = current_namespace
;
4300 = add_exception_specifier (NULL_TREE
, bad_alloc_type_node
, -1);
4303 new_eh_spec
= noexcept_false_spec
;
4305 /* Ensure attribs.c is initialized. */
4308 /* Ensure constraint.cc is initialized. */
4309 init_constraint_processing ();
4311 extvisattr
= build_tree_list (get_identifier ("externally_visible"),
4313 newattrs
= tree_cons (get_identifier ("alloc_size"),
4314 build_tree_list (NULL_TREE
, integer_one_node
),
4316 newtype
= cp_build_type_attribute_variant (ptr_ftype_sizetype
, newattrs
);
4317 newtype
= build_exception_variant (newtype
, new_eh_spec
);
4318 deltype
= cp_build_type_attribute_variant (void_ftype_ptr
, extvisattr
);
4319 deltype
= build_exception_variant (deltype
, empty_except_spec
);
4320 tree opnew
= push_cp_library_fn (NEW_EXPR
, newtype
, 0);
4321 DECL_IS_MALLOC (opnew
) = 1;
4322 DECL_IS_OPERATOR_NEW (opnew
) = 1;
4323 opnew
= push_cp_library_fn (VEC_NEW_EXPR
, newtype
, 0);
4324 DECL_IS_MALLOC (opnew
) = 1;
4325 DECL_IS_OPERATOR_NEW (opnew
) = 1;
4326 push_cp_library_fn (DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4327 push_cp_library_fn (VEC_DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4328 if (flag_sized_deallocation
)
4330 /* Also push the sized deallocation variants:
4331 void operator delete(void*, std::size_t) throw();
4332 void operator delete[](void*, std::size_t) throw(); */
4333 tree void_ftype_ptr_size
4334 = build_function_type_list (void_type_node
, ptr_type_node
,
4335 size_type_node
, NULL_TREE
);
4336 deltype
= cp_build_type_attribute_variant (void_ftype_ptr_size
,
4338 deltype
= build_exception_variant (deltype
, empty_except_spec
);
4339 push_cp_library_fn (DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4340 push_cp_library_fn (VEC_DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4343 if (aligned_new_threshold
)
4345 push_namespace (std_identifier
);
4346 tree align_id
= get_identifier ("align_val_t");
4347 align_type_node
= start_enum (align_id
, NULL_TREE
, size_type_node
,
4348 NULL_TREE
, /*scoped*/true, NULL
);
4351 /* operator new (size_t, align_val_t); */
4352 newtype
= build_function_type_list (ptr_type_node
, size_type_node
,
4353 align_type_node
, NULL_TREE
);
4354 newtype
= cp_build_type_attribute_variant (newtype
, newattrs
);
4355 newtype
= build_exception_variant (newtype
, new_eh_spec
);
4356 opnew
= push_cp_library_fn (NEW_EXPR
, newtype
, 0);
4357 DECL_IS_MALLOC (opnew
) = 1;
4358 DECL_IS_OPERATOR_NEW (opnew
) = 1;
4359 opnew
= push_cp_library_fn (VEC_NEW_EXPR
, newtype
, 0);
4360 DECL_IS_MALLOC (opnew
) = 1;
4361 DECL_IS_OPERATOR_NEW (opnew
) = 1;
4363 /* operator delete (void *, align_val_t); */
4364 deltype
= build_function_type_list (void_type_node
, ptr_type_node
,
4365 align_type_node
, NULL_TREE
);
4366 deltype
= cp_build_type_attribute_variant (deltype
, extvisattr
);
4367 deltype
= build_exception_variant (deltype
, empty_except_spec
);
4368 push_cp_library_fn (DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4369 push_cp_library_fn (VEC_DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4371 if (flag_sized_deallocation
)
4373 /* operator delete (void *, size_t, align_val_t); */
4374 deltype
= build_function_type_list (void_type_node
, ptr_type_node
,
4375 size_type_node
, align_type_node
,
4377 deltype
= cp_build_type_attribute_variant (deltype
, extvisattr
);
4378 deltype
= build_exception_variant (deltype
, empty_except_spec
);
4379 push_cp_library_fn (DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4380 push_cp_library_fn (VEC_DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4384 nullptr_type_node
= make_node (NULLPTR_TYPE
);
4385 TYPE_SIZE (nullptr_type_node
) = bitsize_int (GET_MODE_BITSIZE (ptr_mode
));
4386 TYPE_SIZE_UNIT (nullptr_type_node
) = size_int (GET_MODE_SIZE (ptr_mode
));
4387 TYPE_UNSIGNED (nullptr_type_node
) = 1;
4388 TYPE_PRECISION (nullptr_type_node
) = GET_MODE_BITSIZE (ptr_mode
);
4389 if (abi_version_at_least (9))
4390 SET_TYPE_ALIGN (nullptr_type_node
, GET_MODE_ALIGNMENT (ptr_mode
));
4391 SET_TYPE_MODE (nullptr_type_node
, ptr_mode
);
4392 record_builtin_type (RID_MAX
, "decltype(nullptr)", nullptr_type_node
);
4393 nullptr_node
= build_int_cst (nullptr_type_node
, 0);
4397 = build_library_fn_ptr ("__cxa_pure_virtual", void_ftype
,
4398 ECF_NORETURN
| ECF_NOTHROW
| ECF_COLD
);
4400 /* Perform other language dependent initializations. */
4401 init_class_processing ();
4402 init_rtti_processing ();
4403 init_template_processing ();
4405 if (flag_exceptions
)
4406 init_exception_processing ();
4408 if (! supports_one_only ())
4411 make_fname_decl
= cp_make_fname_decl
;
4412 start_fname_decls ();
4414 /* Show we use EH for cleanups. */
4415 if (flag_exceptions
)
4416 using_eh_for_cleanups ();
4419 /* Generate an initializer for a function naming variable from
4420 NAME. NAME may be NULL, to indicate a dependent name. TYPE_P is
4421 filled in with the type of the init. */
4424 cp_fname_init (const char* name
, tree
*type_p
)
4426 tree domain
= NULL_TREE
;
4428 tree init
= NULL_TREE
;
4433 length
= strlen (name
);
4434 domain
= build_index_type (size_int (length
));
4435 init
= build_string (length
+ 1, name
);
4438 type
= cp_build_qualified_type (char_type_node
, TYPE_QUAL_CONST
);
4439 type
= build_cplus_array_type (type
, domain
);
4444 TREE_TYPE (init
) = type
;
4446 init
= error_mark_node
;
4451 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give
4452 the decl, LOC is the location to give the decl, NAME is the
4453 initialization string and TYPE_DEP indicates whether NAME depended
4454 on the type of the function. We make use of that to detect
4455 __PRETTY_FUNCTION__ inside a template fn. This is being done lazily
4456 at the point of first use, so we mustn't push the decl now. */
4459 cp_make_fname_decl (location_t loc
, tree id
, int type_dep
)
4461 const char *const name
= (type_dep
&& in_template_function ()
4462 ? NULL
: fname_as_string (type_dep
));
4464 tree init
= cp_fname_init (name
, &type
);
4465 tree decl
= build_decl (loc
, VAR_DECL
, id
, type
);
4468 free (CONST_CAST (char *, name
));
4470 /* As we're using pushdecl_with_scope, we must set the context. */
4471 DECL_CONTEXT (decl
) = current_function_decl
;
4473 TREE_READONLY (decl
) = 1;
4474 DECL_ARTIFICIAL (decl
) = 1;
4475 DECL_DECLARED_CONSTEXPR_P (decl
) = 1;
4476 TREE_STATIC (decl
) = 1;
4478 TREE_USED (decl
) = 1;
4482 SET_DECL_VALUE_EXPR (decl
, init
);
4483 DECL_HAS_VALUE_EXPR_P (decl
) = 1;
4484 /* For decl_constant_var_p. */
4485 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl
) = 1;
4488 if (current_function_decl
)
4490 DECL_CONTEXT (decl
) = current_function_decl
;
4491 decl
= pushdecl_outermost_localscope (decl
);
4492 if (decl
!= error_mark_node
)
4493 add_decl_expr (decl
);
4497 DECL_THIS_STATIC (decl
) = true;
4498 pushdecl_top_level_and_finish (decl
, NULL_TREE
);
4505 builtin_function_1 (tree decl
, tree context
, bool is_global
)
4507 tree id
= DECL_NAME (decl
);
4508 const char *name
= IDENTIFIER_POINTER (id
);
4510 retrofit_lang_decl (decl
);
4512 DECL_ARTIFICIAL (decl
) = 1;
4513 SET_DECL_LANGUAGE (decl
, lang_c
);
4514 /* Runtime library routines are, by definition, available in an
4515 external shared object. */
4516 DECL_VISIBILITY (decl
) = VISIBILITY_DEFAULT
;
4517 DECL_VISIBILITY_SPECIFIED (decl
) = 1;
4519 DECL_CONTEXT (decl
) = context
;
4521 /* A function in the user's namespace should have an explicit
4522 declaration before it is used. Mark the built-in function as
4523 anticipated but not actually declared. */
4524 if (name
[0] != '_' || name
[1] != '_')
4525 DECL_ANTICIPATED (decl
) = 1;
4526 else if (strncmp (name
+ 2, "builtin_", strlen ("builtin_")) != 0)
4528 size_t len
= strlen (name
);
4530 /* Treat __*_chk fortification functions as anticipated as well,
4531 unless they are __builtin_*. */
4532 if (len
> strlen ("___chk")
4533 && memcmp (name
+ len
- strlen ("_chk"),
4534 "_chk", strlen ("_chk") + 1) == 0)
4535 DECL_ANTICIPATED (decl
) = 1;
4539 pushdecl_top_level (decl
);
4547 cxx_builtin_function (tree decl
)
4549 tree id
= DECL_NAME (decl
);
4550 const char *name
= IDENTIFIER_POINTER (id
);
4551 /* All builtins that don't begin with an '_' should additionally
4552 go in the 'std' namespace. */
4555 tree decl2
= copy_node(decl
);
4556 push_namespace (std_identifier
);
4557 builtin_function_1 (decl2
, std_node
, false);
4561 return builtin_function_1 (decl
, NULL_TREE
, false);
4564 /* Like cxx_builtin_function, but guarantee the function is added to the global
4565 scope. This is to allow function specific options to add new machine
4566 dependent builtins when the target ISA changes via attribute((target(...)))
4567 which saves space on program startup if the program does not use non-generic
4571 cxx_builtin_function_ext_scope (tree decl
)
4574 tree id
= DECL_NAME (decl
);
4575 const char *name
= IDENTIFIER_POINTER (id
);
4576 /* All builtins that don't begin with an '_' should additionally
4577 go in the 'std' namespace. */
4580 tree decl2
= copy_node(decl
);
4581 push_namespace (std_identifier
);
4582 builtin_function_1 (decl2
, std_node
, true);
4586 return builtin_function_1 (decl
, NULL_TREE
, true);
4589 /* Generate a FUNCTION_DECL with the typical flags for a runtime library
4590 function. Not called directly. */
4593 build_library_fn (tree name
, enum tree_code operator_code
, tree type
,
4596 tree fn
= build_lang_decl (FUNCTION_DECL
, name
, type
);
4597 DECL_EXTERNAL (fn
) = 1;
4598 TREE_PUBLIC (fn
) = 1;
4599 DECL_ARTIFICIAL (fn
) = 1;
4600 DECL_OVERLOADED_OPERATOR_CODE_RAW (fn
)
4601 = OVL_OP_INFO (false, operator_code
)->ovl_op_code
;
4602 SET_DECL_LANGUAGE (fn
, lang_c
);
4603 /* Runtime library routines are, by definition, available in an
4604 external shared object. */
4605 DECL_VISIBILITY (fn
) = VISIBILITY_DEFAULT
;
4606 DECL_VISIBILITY_SPECIFIED (fn
) = 1;
4607 set_call_expr_flags (fn
, ecf_flags
);
4611 /* Returns the _DECL for a library function with C++ linkage. */
4614 build_cp_library_fn (tree name
, enum tree_code operator_code
, tree type
,
4617 tree fn
= build_library_fn (name
, operator_code
, type
, ecf_flags
);
4618 DECL_CONTEXT (fn
) = FROB_CONTEXT (current_namespace
);
4619 SET_DECL_LANGUAGE (fn
, lang_cplusplus
);
4623 /* Like build_library_fn, but takes a C string instead of an
4627 build_library_fn_ptr (const char* name
, tree type
, int ecf_flags
)
4629 return build_library_fn (get_identifier (name
), ERROR_MARK
, type
, ecf_flags
);
4632 /* Like build_cp_library_fn, but takes a C string instead of an
4636 build_cp_library_fn_ptr (const char* name
, tree type
, int ecf_flags
)
4638 return build_cp_library_fn (get_identifier (name
), ERROR_MARK
, type
,
4642 /* Like build_library_fn, but also pushes the function so that we will
4643 be able to find it via get_global_binding. Also, the function
4644 may throw exceptions listed in RAISES. */
4647 push_library_fn (tree name
, tree type
, tree raises
, int ecf_flags
)
4652 type
= build_exception_variant (type
, raises
);
4654 fn
= build_library_fn (name
, ERROR_MARK
, type
, ecf_flags
);
4655 pushdecl_top_level (fn
);
4659 /* Like build_cp_library_fn, but also pushes the function so that it
4660 will be found by normal lookup. */
4663 push_cp_library_fn (enum tree_code operator_code
, tree type
,
4666 tree fn
= build_cp_library_fn (ovl_op_identifier (false, operator_code
),
4667 operator_code
, type
, ecf_flags
);
4670 apply_tm_attr (fn
, get_identifier ("transaction_safe"));
4674 /* Like push_library_fn, but takes a TREE_LIST of parm types rather than
4678 push_void_library_fn (tree name
, tree parmtypes
, int ecf_flags
)
4680 tree type
= build_function_type (void_type_node
, parmtypes
);
4681 return push_library_fn (name
, type
, NULL_TREE
, ecf_flags
);
4684 /* Like push_library_fn, but also note that this function throws
4685 and does not return. Used for __throw_foo and the like. */
4688 push_throw_library_fn (tree name
, tree type
)
4690 tree fn
= push_library_fn (name
, type
, NULL_TREE
, ECF_NORETURN
| ECF_COLD
);
4694 /* When we call finish_struct for an anonymous union, we create
4695 default copy constructors and such. But, an anonymous union
4696 shouldn't have such things; this function undoes the damage to the
4697 anonymous union type T.
4699 (The reason that we create the synthesized methods is that we don't
4700 distinguish `union { int i; }' from `typedef union { int i; } U'.
4701 The first is an anonymous union; the second is just an ordinary
4705 fixup_anonymous_aggr (tree t
)
4707 /* Wipe out memory of synthesized methods. */
4708 TYPE_HAS_USER_CONSTRUCTOR (t
) = 0;
4709 TYPE_HAS_DEFAULT_CONSTRUCTOR (t
) = 0;
4710 TYPE_HAS_COPY_CTOR (t
) = 0;
4711 TYPE_HAS_CONST_COPY_CTOR (t
) = 0;
4712 TYPE_HAS_COPY_ASSIGN (t
) = 0;
4713 TYPE_HAS_CONST_COPY_ASSIGN (t
) = 0;
4715 /* Splice the implicitly generated functions out of TYPE_FIELDS. */
4716 for (tree probe
, *prev_p
= &TYPE_FIELDS (t
); (probe
= *prev_p
);)
4717 if (TREE_CODE (probe
) == FUNCTION_DECL
&& DECL_ARTIFICIAL (probe
))
4718 *prev_p
= DECL_CHAIN (probe
);
4720 prev_p
= &DECL_CHAIN (probe
);
4722 /* Anonymous aggregates cannot have fields with ctors, dtors or complex
4723 assignment operators (because they cannot have these methods themselves).
4724 For anonymous unions this is already checked because they are not allowed
4725 in any union, otherwise we have to check it. */
4726 if (TREE_CODE (t
) != UNION_TYPE
)
4730 for (field
= TYPE_FIELDS (t
); field
; field
= DECL_CHAIN (field
))
4731 if (TREE_CODE (field
) == FIELD_DECL
)
4733 type
= TREE_TYPE (field
);
4734 if (CLASS_TYPE_P (type
))
4736 if (TYPE_NEEDS_CONSTRUCTING (type
))
4737 error ("member %q+#D with constructor not allowed "
4738 "in anonymous aggregate", field
);
4739 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type
))
4740 error ("member %q+#D with destructor not allowed "
4741 "in anonymous aggregate", field
);
4742 if (TYPE_HAS_COMPLEX_COPY_ASSIGN (type
))
4743 error ("member %q+#D with copy assignment operator "
4744 "not allowed in anonymous aggregate", field
);
4750 /* Warn for an attribute located at LOCATION that appertains to the
4751 class type CLASS_TYPE that has not been properly placed after its
4752 class-key, in it class-specifier. */
4755 warn_misplaced_attr_for_class_type (location_t location
,
4758 gcc_assert (OVERLOAD_TYPE_P (class_type
));
4760 auto_diagnostic_group d
;
4761 if (warning_at (location
, OPT_Wattributes
,
4762 "attribute ignored in declaration "
4763 "of %q#T", class_type
))
4765 "attribute for %q#T must follow the %qs keyword",
4766 class_type
, class_key_or_enum_as_string (class_type
));
4769 /* Make sure that a declaration with no declarator is well-formed, i.e.
4770 just declares a tagged type or anonymous union.
4772 Returns the type declared; or NULL_TREE if none. */
4775 check_tag_decl (cp_decl_specifier_seq
*declspecs
,
4776 bool explicit_type_instantiation_p
)
4778 int saw_friend
= decl_spec_seq_has_spec_p (declspecs
, ds_friend
);
4779 int saw_typedef
= decl_spec_seq_has_spec_p (declspecs
, ds_typedef
);
4780 /* If a class, struct, or enum type is declared by the DECLSPECS
4781 (i.e, if a class-specifier, enum-specifier, or non-typename
4782 elaborated-type-specifier appears in the DECLSPECS),
4783 DECLARED_TYPE is set to the corresponding type. */
4784 tree declared_type
= NULL_TREE
;
4785 bool error_p
= false;
4787 if (declspecs
->multiple_types_p
)
4788 error ("multiple types in one declaration");
4789 else if (declspecs
->redefined_builtin_type
)
4791 if (!in_system_header_at (input_location
))
4792 permerror (declspecs
->locations
[ds_redefined_builtin_type_spec
],
4793 "redeclaration of C++ built-in type %qT",
4794 declspecs
->redefined_builtin_type
);
4799 && TYPE_P (declspecs
->type
)
4800 && ((TREE_CODE (declspecs
->type
) != TYPENAME_TYPE
4801 && MAYBE_CLASS_TYPE_P (declspecs
->type
))
4802 || TREE_CODE (declspecs
->type
) == ENUMERAL_TYPE
))
4803 declared_type
= declspecs
->type
;
4804 else if (declspecs
->type
== error_mark_node
)
4807 if (type_uses_auto (declared_type
))
4809 error_at (declspecs
->locations
[ds_type_spec
],
4810 "%<auto%> can only be specified for variables "
4811 "or function declarations");
4812 return error_mark_node
;
4815 if (declared_type
&& !OVERLOAD_TYPE_P (declared_type
))
4816 declared_type
= NULL_TREE
;
4818 if (!declared_type
&& !saw_friend
&& !error_p
)
4819 permerror (input_location
, "declaration does not declare anything");
4820 /* Check for an anonymous union. */
4821 else if (declared_type
&& RECORD_OR_UNION_CODE_P (TREE_CODE (declared_type
))
4822 && TYPE_UNNAMED_P (declared_type
))
4824 /* 7/3 In a simple-declaration, the optional init-declarator-list
4825 can be omitted only when declaring a class (clause 9) or
4826 enumeration (7.2), that is, when the decl-specifier-seq contains
4827 either a class-specifier, an elaborated-type-specifier with
4828 a class-key (9.1), or an enum-specifier. In these cases and
4829 whenever a class-specifier or enum-specifier is present in the
4830 decl-specifier-seq, the identifiers in these specifiers are among
4831 the names being declared by the declaration (as class-name,
4832 enum-names, or enumerators, depending on the syntax). In such
4833 cases, and except for the declaration of an unnamed bit-field (9.6),
4834 the decl-specifier-seq shall introduce one or more names into the
4835 program, or shall redeclare a name introduced by a previous
4836 declaration. [Example:
4837 enum { }; // ill-formed
4838 typedef class { }; // ill-formed
4842 error ("missing type-name in typedef-declaration");
4845 /* Anonymous unions are objects, so they can have specifiers. */;
4846 SET_ANON_AGGR_TYPE_P (declared_type
);
4848 if (TREE_CODE (declared_type
) != UNION_TYPE
4849 && !in_system_header_at (input_location
))
4850 pedwarn (input_location
, OPT_Wpedantic
, "ISO C++ prohibits anonymous structs");
4855 if (decl_spec_seq_has_spec_p (declspecs
, ds_inline
))
4856 error_at (declspecs
->locations
[ds_inline
],
4857 "%<inline%> can only be specified for functions");
4858 else if (decl_spec_seq_has_spec_p (declspecs
, ds_virtual
))
4859 error_at (declspecs
->locations
[ds_virtual
],
4860 "%<virtual%> can only be specified for functions");
4862 && (!current_class_type
4863 || current_scope () != current_class_type
))
4864 error_at (declspecs
->locations
[ds_friend
],
4865 "%<friend%> can only be specified inside a class");
4866 else if (decl_spec_seq_has_spec_p (declspecs
, ds_explicit
))
4867 error_at (declspecs
->locations
[ds_explicit
],
4868 "%<explicit%> can only be specified for constructors");
4869 else if (declspecs
->storage_class
)
4870 error_at (declspecs
->locations
[ds_storage_class
],
4871 "a storage class can only be specified for objects "
4873 else if (decl_spec_seq_has_spec_p (declspecs
, ds_const
))
4874 error_at (declspecs
->locations
[ds_const
],
4875 "%<const%> can only be specified for objects and "
4877 else if (decl_spec_seq_has_spec_p (declspecs
, ds_volatile
))
4878 error_at (declspecs
->locations
[ds_volatile
],
4879 "%<volatile%> can only be specified for objects and "
4881 else if (decl_spec_seq_has_spec_p (declspecs
, ds_restrict
))
4882 error_at (declspecs
->locations
[ds_restrict
],
4883 "%<__restrict%> can only be specified for objects and "
4885 else if (decl_spec_seq_has_spec_p (declspecs
, ds_thread
))
4886 error_at (declspecs
->locations
[ds_thread
],
4887 "%<__thread%> can only be specified for objects "
4889 else if (saw_typedef
)
4890 warning_at (declspecs
->locations
[ds_typedef
], 0,
4891 "%<typedef%> was ignored in this declaration");
4892 else if (decl_spec_seq_has_spec_p (declspecs
, ds_constexpr
))
4893 error_at (declspecs
->locations
[ds_constexpr
],
4894 "%<constexpr%> cannot be used for type declarations");
4897 if (declspecs
->attributes
&& warn_attributes
&& declared_type
)
4900 if (!CLASS_TYPE_P (declared_type
)
4901 || !CLASSTYPE_TEMPLATE_INSTANTIATION (declared_type
))
4902 /* For a non-template class, use the name location. */
4903 loc
= location_of (declared_type
);
4905 /* For a template class (an explicit instantiation), use the
4906 current location. */
4907 loc
= input_location
;
4909 if (explicit_type_instantiation_p
)
4910 /* [dcl.attr.grammar]/4:
4912 No attribute-specifier-seq shall appertain to an explicit
4915 if (warning_at (loc
, OPT_Wattributes
,
4916 "attribute ignored in explicit instantiation %q#T",
4919 "no attribute can be applied to "
4920 "an explicit instantiation");
4923 warn_misplaced_attr_for_class_type (loc
, declared_type
);
4926 return declared_type
;
4929 /* Called when a declaration is seen that contains no names to declare.
4930 If its type is a reference to a structure, union or enum inherited
4931 from a containing scope, shadow that tag name for the current scope
4932 with a forward reference.
4933 If its type defines a new named structure or union
4934 or defines an enum, it is valid but we need not do anything here.
4935 Otherwise, it is an error.
4937 C++: may have to grok the declspecs to learn about static,
4938 complain for anonymous unions.
4940 Returns the TYPE declared -- or NULL_TREE if none. */
4943 shadow_tag (cp_decl_specifier_seq
*declspecs
)
4945 tree t
= check_tag_decl (declspecs
,
4946 /*explicit_type_instantiation_p=*/false);
4951 if (maybe_process_partial_specialization (t
) == error_mark_node
)
4954 /* This is where the variables in an anonymous union are
4955 declared. An anonymous union declaration looks like:
4957 because there is no declarator after the union, the parser
4958 sends that declaration here. */
4959 if (ANON_AGGR_TYPE_P (t
))
4961 fixup_anonymous_aggr (t
);
4963 if (TYPE_FIELDS (t
))
4965 tree decl
= grokdeclarator (/*declarator=*/NULL
,
4966 declspecs
, NORMAL
, 0, NULL
);
4967 finish_anon_union (decl
);
4974 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
4977 groktypename (cp_decl_specifier_seq
*type_specifiers
,
4978 const cp_declarator
*declarator
,
4979 bool is_template_arg
)
4983 enum decl_context context
4984 = is_template_arg
? TEMPLATE_TYPE_ARG
: TYPENAME
;
4985 attrs
= type_specifiers
->attributes
;
4986 type_specifiers
->attributes
= NULL_TREE
;
4987 type
= grokdeclarator (declarator
, type_specifiers
, context
, 0, &attrs
);
4988 if (attrs
&& type
!= error_mark_node
)
4990 if (CLASS_TYPE_P (type
))
4991 warning (OPT_Wattributes
, "ignoring attributes applied to class type %qT "
4992 "outside of definition", type
);
4993 else if (MAYBE_CLASS_TYPE_P (type
))
4994 /* A template type parameter or other dependent type. */
4995 warning (OPT_Wattributes
, "ignoring attributes applied to dependent "
4996 "type %qT without an associated declaration", type
);
4998 cplus_decl_attributes (&type
, attrs
, 0);
5003 /* Process a DECLARATOR for a function-scope variable declaration,
5004 namespace-scope variable declaration, or function declaration.
5005 (Function definitions go through start_function; class member
5006 declarations appearing in the body of the class go through
5007 grokfield.) The DECL corresponding to the DECLARATOR is returned.
5008 If an error occurs, the error_mark_node is returned instead.
5010 DECLSPECS are the decl-specifiers for the declaration. INITIALIZED is
5011 SD_INITIALIZED if an explicit initializer is present, or SD_DEFAULTED
5012 for an explicitly defaulted function, or SD_DELETED for an explicitly
5013 deleted function, but 0 (SD_UNINITIALIZED) if this is a variable
5014 implicitly initialized via a default constructor. ATTRIBUTES and
5015 PREFIX_ATTRIBUTES are GNU attributes associated with this declaration.
5017 The scope represented by the context of the returned DECL is pushed
5018 (if it is not the global namespace) and is assigned to
5019 *PUSHED_SCOPE_P. The caller is then responsible for calling
5020 pop_scope on *PUSHED_SCOPE_P if it is set. */
5023 start_decl (const cp_declarator
*declarator
,
5024 cp_decl_specifier_seq
*declspecs
,
5027 tree prefix_attributes
,
5028 tree
*pushed_scope_p
)
5036 *pushed_scope_p
= NULL_TREE
;
5038 /* An object declared as __attribute__((deprecated)) suppresses
5039 warnings of uses of other deprecated items. */
5040 if (lookup_attribute ("deprecated", attributes
))
5041 deprecated_state
= DEPRECATED_SUPPRESS
;
5043 attributes
= chainon (attributes
, prefix_attributes
);
5045 decl
= grokdeclarator (declarator
, declspecs
, NORMAL
, initialized
,
5048 deprecated_state
= DEPRECATED_NORMAL
;
5050 if (decl
== NULL_TREE
|| VOID_TYPE_P (decl
)
5051 || decl
== error_mark_node
)
5052 return error_mark_node
;
5054 context
= CP_DECL_CONTEXT (decl
);
5055 if (context
!= global_namespace
)
5056 *pushed_scope_p
= push_scope (context
);
5058 /* Is it valid for this decl to have an initializer at all?
5059 If not, set INITIALIZED to zero, which will indirectly
5060 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
5062 && TREE_CODE (decl
) == TYPE_DECL
)
5064 error ("typedef %qD is initialized (use decltype instead)", decl
);
5065 return error_mark_node
;
5070 if (! toplevel_bindings_p ()
5071 && DECL_EXTERNAL (decl
))
5072 warning (0, "declaration of %q#D has %<extern%> and is initialized",
5074 DECL_EXTERNAL (decl
) = 0;
5075 if (toplevel_bindings_p ())
5076 TREE_STATIC (decl
) = 1;
5078 alias
= lookup_attribute ("alias", DECL_ATTRIBUTES (decl
)) != 0;
5080 if (alias
&& TREE_CODE (decl
) == FUNCTION_DECL
)
5081 record_key_method_defined (decl
);
5083 /* If this is a typedef that names the class for linkage purposes
5084 (7.1.3p8), apply any attributes directly to the type. */
5085 if (TREE_CODE (decl
) == TYPE_DECL
5086 && OVERLOAD_TYPE_P (TREE_TYPE (decl
))
5087 && decl
== TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (decl
))))
5088 flags
= ATTR_FLAG_TYPE_IN_PLACE
;
5092 /* Set attributes here so if duplicate decl, will have proper attributes. */
5093 cplus_decl_attributes (&decl
, attributes
, flags
);
5095 /* Dllimported symbols cannot be defined. Static data members (which
5096 can be initialized in-class and dllimported) go through grokfield,
5097 not here, so we don't need to exclude those decls when checking for
5099 if (initialized
&& DECL_DLLIMPORT_P (decl
))
5101 error ("definition of %q#D is marked %<dllimport%>", decl
);
5102 DECL_DLLIMPORT_P (decl
) = 0;
5105 /* If #pragma weak was used, mark the decl weak now. */
5106 if (!processing_template_decl
&& !DECL_DECOMPOSITION_P (decl
))
5107 maybe_apply_pragma_weak (decl
);
5109 if (TREE_CODE (decl
) == FUNCTION_DECL
5110 && DECL_DECLARED_INLINE_P (decl
)
5111 && DECL_UNINLINABLE (decl
)
5112 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl
)))
5113 warning_at (DECL_SOURCE_LOCATION (decl
), 0,
5114 "inline function %qD given attribute noinline", decl
);
5116 if (TYPE_P (context
) && COMPLETE_TYPE_P (complete_type (context
)))
5118 bool this_tmpl
= (processing_template_decl
5119 > template_class_depth (context
));
5122 tree field
= lookup_field (context
, DECL_NAME (decl
), 0, false);
5123 if (field
== NULL_TREE
5124 || !(VAR_P (field
) || variable_template_p (field
)))
5125 error ("%q+#D is not a static data member of %q#T", decl
, context
);
5126 else if (variable_template_p (field
)
5127 && (DECL_LANG_SPECIFIC (decl
)
5128 && DECL_TEMPLATE_SPECIALIZATION (decl
)))
5129 /* OK, specialization was already checked. */;
5130 else if (variable_template_p (field
) && !this_tmpl
)
5132 error_at (DECL_SOURCE_LOCATION (decl
),
5133 "non-member-template declaration of %qD", decl
);
5134 inform (DECL_SOURCE_LOCATION (field
), "does not match "
5135 "member template declaration here");
5136 return error_mark_node
;
5140 if (variable_template_p (field
))
5141 field
= DECL_TEMPLATE_RESULT (field
);
5143 if (DECL_CONTEXT (field
) != context
)
5145 if (!same_type_p (DECL_CONTEXT (field
), context
))
5146 permerror (input_location
, "ISO C++ does not permit %<%T::%D%> "
5147 "to be defined as %<%T::%D%>",
5148 DECL_CONTEXT (field
), DECL_NAME (decl
),
5149 context
, DECL_NAME (decl
));
5150 DECL_CONTEXT (decl
) = DECL_CONTEXT (field
);
5152 /* Static data member are tricky; an in-class initialization
5153 still doesn't provide a definition, so the in-class
5154 declaration will have DECL_EXTERNAL set, but will have an
5155 initialization. Thus, duplicate_decls won't warn
5156 about this situation, and so we check here. */
5157 if (initialized
&& DECL_INITIALIZED_IN_CLASS_P (field
))
5158 error ("duplicate initialization of %qD", decl
);
5159 field
= duplicate_decls (decl
, field
,
5160 /*newdecl_is_friend=*/false);
5161 if (field
== error_mark_node
)
5162 return error_mark_node
;
5169 tree field
= check_classfn (context
, decl
,
5171 ? current_template_parms
5173 if (field
&& field
!= error_mark_node
5174 && duplicate_decls (decl
, field
,
5175 /*newdecl_is_friend=*/false))
5179 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
5180 DECL_IN_AGGR_P (decl
) = 0;
5181 /* Do not mark DECL as an explicit specialization if it was not
5182 already marked as an instantiation; a declaration should
5183 never be marked as a specialization unless we know what
5184 template is being specialized. */
5185 if (DECL_LANG_SPECIFIC (decl
) && DECL_USE_TEMPLATE (decl
))
5187 SET_DECL_TEMPLATE_SPECIALIZATION (decl
);
5188 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5189 DECL_COMDAT (decl
) = (TREE_PUBLIC (decl
)
5190 && DECL_DECLARED_INLINE_P (decl
));
5192 DECL_COMDAT (decl
) = false;
5194 /* [temp.expl.spec] An explicit specialization of a static data
5195 member of a template is a definition if the declaration
5196 includes an initializer; otherwise, it is a declaration.
5198 We check for processing_specialization so this only applies
5199 to the new specialization syntax. */
5200 if (!initialized
&& processing_specialization
)
5201 DECL_EXTERNAL (decl
) = 1;
5204 if (DECL_EXTERNAL (decl
) && ! DECL_TEMPLATE_SPECIALIZATION (decl
)
5205 /* Aliases are definitions. */
5207 permerror (input_location
, "declaration of %q#D outside of class is not definition",
5211 was_public
= TREE_PUBLIC (decl
);
5213 /* Enter this declaration into the symbol table. Don't push the plain
5214 VAR_DECL for a variable template. */
5215 if (!template_parm_scope_p ()
5217 decl
= maybe_push_decl (decl
);
5219 if (processing_template_decl
)
5220 decl
= push_template_decl (decl
);
5221 if (decl
== error_mark_node
)
5222 return error_mark_node
;
5225 && DECL_NAMESPACE_SCOPE_P (decl
) && !TREE_PUBLIC (decl
) && !was_public
5226 && !DECL_THIS_STATIC (decl
) && !DECL_ARTIFICIAL (decl
))
5228 /* This is a const variable with implicit 'static'. Set
5229 DECL_THIS_STATIC so we can tell it from variables that are
5230 !TREE_PUBLIC because of the anonymous namespace. */
5231 gcc_assert (CP_TYPE_CONST_P (TREE_TYPE (decl
)) || errorcount
);
5232 DECL_THIS_STATIC (decl
) = 1;
5235 if (current_function_decl
&& VAR_P (decl
)
5236 && DECL_DECLARED_CONSTEXPR_P (current_function_decl
))
5239 if (CP_DECL_THREAD_LOCAL_P (decl
))
5240 error ("%qD declared %<thread_local%> in %<constexpr%> function",
5242 else if (TREE_STATIC (decl
))
5243 error ("%qD declared %<static%> in %<constexpr%> function", decl
);
5247 cp_function_chain
->invalid_constexpr
= true;
5250 if (!processing_template_decl
&& VAR_P (decl
))
5251 start_decl_1 (decl
, initialized
);
5256 /* Process the declaration of a variable DECL. INITIALIZED is true
5257 iff DECL is explicitly initialized. (INITIALIZED is false if the
5258 variable is initialized via an implicitly-called constructor.)
5259 This function must be called for ordinary variables (including, for
5260 example, implicit instantiations of templates), but must not be
5261 called for template declarations. */
5264 start_decl_1 (tree decl
, bool initialized
)
5268 bool aggregate_definition_p
;
5270 gcc_assert (!processing_template_decl
);
5272 if (error_operand_p (decl
))
5275 gcc_assert (VAR_P (decl
));
5277 type
= TREE_TYPE (decl
);
5278 complete_p
= COMPLETE_TYPE_P (type
);
5279 aggregate_definition_p
= MAYBE_CLASS_TYPE_P (type
) && !DECL_EXTERNAL (decl
);
5281 /* If an explicit initializer is present, or if this is a definition
5282 of an aggregate, then we need a complete type at this point.
5283 (Scalars are always complete types, so there is nothing to
5284 check.) This code just sets COMPLETE_P; errors (if necessary)
5285 are issued below. */
5286 if ((initialized
|| aggregate_definition_p
)
5288 && COMPLETE_TYPE_P (complete_type (type
)))
5291 /* We will not yet have set TREE_READONLY on DECL if the type
5292 was "const", but incomplete, before this point. But, now, we
5293 have a complete type, so we can try again. */
5294 cp_apply_type_quals_to_decl (cp_type_quals (type
), decl
);
5298 /* Is it valid for this decl to have an initializer at all? */
5300 /* Don't allow initializations for incomplete types except for
5301 arrays which might be completed by the initialization. */
5303 ; /* A complete type is ok. */
5304 else if (type_uses_auto (type
))
5305 ; /* An auto type is ok. */
5306 else if (TREE_CODE (type
) != ARRAY_TYPE
)
5308 error ("variable %q#D has initializer but incomplete type", decl
);
5309 type
= TREE_TYPE (decl
) = error_mark_node
;
5311 else if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type
))))
5313 if (DECL_LANG_SPECIFIC (decl
) && DECL_TEMPLATE_INFO (decl
))
5314 error ("elements of array %q#D have incomplete type", decl
);
5315 /* else we already gave an error in start_decl. */
5318 else if (aggregate_definition_p
&& !complete_p
)
5320 if (type_uses_auto (type
))
5321 gcc_assert (CLASS_PLACEHOLDER_TEMPLATE (type
));
5324 error ("aggregate %q#D has incomplete type and cannot be defined",
5326 /* Change the type so that assemble_variable will give
5327 DECL an rtl we can live with: (mem (const_int 0)). */
5328 type
= TREE_TYPE (decl
) = error_mark_node
;
5332 /* Create a new scope to hold this declaration if necessary.
5333 Whether or not a new scope is necessary cannot be determined
5334 until after the type has been completed; if the type is a
5335 specialization of a class template it is not until after
5336 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
5337 will be set correctly. */
5338 maybe_push_cleanup_level (type
);
5341 /* Handle initialization of references. DECL, TYPE, and INIT have the
5342 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
5343 but will be set to a new CLEANUP_STMT if a temporary is created
5344 that must be destroyed subsequently.
5346 Returns an initializer expression to use to initialize DECL, or
5347 NULL if the initialization can be performed statically.
5349 Quotes on semantics can be found in ARM 8.4.3. */
5352 grok_reference_init (tree decl
, tree type
, tree init
, int flags
)
5354 if (init
== NULL_TREE
)
5356 if ((DECL_LANG_SPECIFIC (decl
) == 0
5357 || DECL_IN_AGGR_P (decl
) == 0)
5358 && ! DECL_THIS_EXTERN (decl
))
5359 error ("%qD declared as reference but not initialized", decl
);
5363 if (TREE_CODE (init
) == TREE_LIST
)
5364 init
= build_x_compound_expr_from_list (init
, ELK_INIT
,
5365 tf_warning_or_error
);
5367 tree ttype
= TREE_TYPE (type
);
5368 if (TREE_CODE (ttype
) != ARRAY_TYPE
5369 && TREE_CODE (TREE_TYPE (init
)) == ARRAY_TYPE
)
5370 /* Note: default conversion is only called in very special cases. */
5371 init
= decay_conversion (init
, tf_warning_or_error
);
5373 /* check_initializer handles this for non-reference variables, but for
5374 references we need to do it here or the initializer will get the
5375 incomplete array type and confuse later calls to
5376 cp_complete_array_type. */
5377 if (TREE_CODE (ttype
) == ARRAY_TYPE
5378 && TYPE_DOMAIN (ttype
) == NULL_TREE
5379 && (BRACE_ENCLOSED_INITIALIZER_P (init
)
5380 || TREE_CODE (init
) == STRING_CST
))
5382 cp_complete_array_type (&ttype
, init
, false);
5383 if (ttype
!= TREE_TYPE (type
))
5384 type
= cp_build_reference_type (ttype
, TYPE_REF_IS_RVALUE (type
));
5387 /* Convert INIT to the reference type TYPE. This may involve the
5388 creation of a temporary, whose lifetime must be the same as that
5389 of the reference. If so, a DECL_EXPR for the temporary will be
5390 added just after the DECL_EXPR for DECL. That's why we don't set
5391 DECL_INITIAL for local references (instead assigning to them
5392 explicitly); we need to allow the temporary to be initialized
5394 return initialize_reference (type
, init
, flags
,
5395 tf_warning_or_error
);
5398 /* Designated initializers in arrays are not supported in GNU C++.
5399 The parser cannot detect this error since it does not know whether
5400 a given brace-enclosed initializer is for a class type or for an
5401 array. This function checks that CE does not use a designated
5402 initializer. If it does, an error is issued. Returns true if CE
5403 is valid, i.e., does not have a designated initializer. */
5406 check_array_designated_initializer (constructor_elt
*ce
,
5407 unsigned HOST_WIDE_INT index
)
5409 /* Designated initializers for array elements are not supported. */
5412 /* The parser only allows identifiers as designated
5414 if (ce
->index
== error_mark_node
)
5416 error ("name used in a GNU-style designated "
5417 "initializer for an array");
5420 else if (identifier_p (ce
->index
))
5422 error ("name %qD used in a GNU-style designated "
5423 "initializer for an array", ce
->index
);
5427 tree ce_index
= build_expr_type_conversion (WANT_INT
| WANT_ENUM
,
5430 && INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (ce_index
))
5431 && (TREE_CODE (ce_index
= fold_non_dependent_expr (ce_index
))
5434 /* A C99 designator is OK if it matches the current index. */
5435 if (wi::to_wide (ce_index
) == index
)
5437 ce
->index
= ce_index
;
5441 sorry ("non-trivial designated initializers not supported");
5444 error ("C99 designator %qE is not an integral constant-expression",
5453 /* When parsing `int a[] = {1, 2};' we don't know the size of the
5454 array until we finish parsing the initializer. If that's the
5455 situation we're in, update DECL accordingly. */
5458 maybe_deduce_size_from_array_init (tree decl
, tree init
)
5460 tree type
= TREE_TYPE (decl
);
5462 if (TREE_CODE (type
) == ARRAY_TYPE
5463 && TYPE_DOMAIN (type
) == NULL_TREE
5464 && TREE_CODE (decl
) != TYPE_DECL
)
5466 /* do_default is really a C-ism to deal with tentative definitions.
5467 But let's leave it here to ease the eventual merge. */
5468 int do_default
= !DECL_EXTERNAL (decl
);
5469 tree initializer
= init
? init
: DECL_INITIAL (decl
);
5472 /* Check that there are no designated initializers in INIT, as
5473 those are not supported in GNU C++, and as the middle-end
5474 will crash if presented with a non-numeric designated
5476 if (initializer
&& BRACE_ENCLOSED_INITIALIZER_P (initializer
))
5478 vec
<constructor_elt
, va_gc
> *v
= CONSTRUCTOR_ELTS (initializer
);
5479 constructor_elt
*ce
;
5481 FOR_EACH_VEC_SAFE_ELT (v
, i
, ce
)
5483 if (instantiation_dependent_expression_p (ce
->index
))
5485 if (!check_array_designated_initializer (ce
, i
))
5491 TREE_TYPE (decl
) = error_mark_node
;
5494 failure
= cp_complete_array_type (&TREE_TYPE (decl
), initializer
,
5498 error_at (cp_expr_loc_or_loc (initializer
,
5499 DECL_SOURCE_LOCATION (decl
)),
5500 "initializer fails to determine size of %qD", decl
);
5502 else if (failure
== 2)
5506 error_at (DECL_SOURCE_LOCATION (decl
),
5507 "array size missing in %qD", decl
);
5509 /* If a `static' var's size isn't known, make it extern as
5510 well as static, so it does not get allocated. If it's not
5511 `static', then don't mark it extern; finish_incomplete_decl
5512 will give it a default size and it will get allocated. */
5513 else if (!pedantic
&& TREE_STATIC (decl
) && !TREE_PUBLIC (decl
))
5514 DECL_EXTERNAL (decl
) = 1;
5516 else if (failure
== 3)
5518 error_at (DECL_SOURCE_LOCATION (decl
),
5519 "zero-size array %qD", decl
);
5523 cp_apply_type_quals_to_decl (cp_type_quals (TREE_TYPE (decl
)), decl
);
5525 relayout_decl (decl
);
5529 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
5530 any appropriate error messages regarding the layout. */
5533 layout_var_decl (tree decl
)
5537 type
= TREE_TYPE (decl
);
5538 if (type
== error_mark_node
)
5541 /* If we haven't already laid out this declaration, do so now.
5542 Note that we must not call complete type for an external object
5543 because it's type might involve templates that we are not
5544 supposed to instantiate yet. (And it's perfectly valid to say
5545 `extern X x' for some incomplete type `X'.) */
5546 if (!DECL_EXTERNAL (decl
))
5547 complete_type (type
);
5548 if (!DECL_SIZE (decl
)
5549 && TREE_TYPE (decl
) != error_mark_node
5550 && complete_or_array_type_p (type
))
5551 layout_decl (decl
, 0);
5553 if (!DECL_EXTERNAL (decl
) && DECL_SIZE (decl
) == NULL_TREE
)
5555 /* An automatic variable with an incomplete type: that is an error.
5556 Don't talk about array types here, since we took care of that
5557 message in grokdeclarator. */
5558 error_at (DECL_SOURCE_LOCATION (decl
),
5559 "storage size of %qD isn%'t known", decl
);
5560 TREE_TYPE (decl
) = error_mark_node
;
5563 /* Keep this code around in case we later want to control debug info
5564 based on whether a type is "used". (jason 1999-11-11) */
5566 else if (!DECL_EXTERNAL (decl
) && MAYBE_CLASS_TYPE_P (ttype
))
5567 /* Let debugger know it should output info for this type. */
5568 note_debug_info_needed (ttype
);
5570 if (TREE_STATIC (decl
) && DECL_CLASS_SCOPE_P (decl
))
5571 note_debug_info_needed (DECL_CONTEXT (decl
));
5574 if ((DECL_EXTERNAL (decl
) || TREE_STATIC (decl
))
5575 && DECL_SIZE (decl
) != NULL_TREE
5576 && ! TREE_CONSTANT (DECL_SIZE (decl
)))
5578 if (TREE_CODE (DECL_SIZE (decl
)) == INTEGER_CST
)
5579 constant_expression_warning (DECL_SIZE (decl
));
5582 error_at (DECL_SOURCE_LOCATION (decl
),
5583 "storage size of %qD isn%'t constant", decl
);
5584 TREE_TYPE (decl
) = error_mark_node
;
5589 /* If a local static variable is declared in an inline function, or if
5590 we have a weak definition, we must endeavor to create only one
5591 instance of the variable at link-time. */
5594 maybe_commonize_var (tree decl
)
5596 /* Don't mess with __FUNCTION__ and similar. */
5597 if (DECL_ARTIFICIAL (decl
))
5600 /* Static data in a function with comdat linkage also has comdat
5602 if ((TREE_STATIC (decl
)
5603 && DECL_FUNCTION_SCOPE_P (decl
)
5604 && vague_linkage_p (DECL_CONTEXT (decl
)))
5605 || (TREE_PUBLIC (decl
) && DECL_INLINE_VAR_P (decl
)))
5609 /* With weak symbols, we simply make the variable COMDAT;
5610 that will cause copies in multiple translations units to
5612 comdat_linkage (decl
);
5616 if (DECL_INITIAL (decl
) == NULL_TREE
5617 || DECL_INITIAL (decl
) == error_mark_node
)
5619 /* Without weak symbols, we can use COMMON to merge
5620 uninitialized variables. */
5621 TREE_PUBLIC (decl
) = 1;
5622 DECL_COMMON (decl
) = 1;
5626 /* While for initialized variables, we must use internal
5627 linkage -- which means that multiple copies will not
5629 TREE_PUBLIC (decl
) = 0;
5630 DECL_COMMON (decl
) = 0;
5632 if (DECL_INLINE_VAR_P (decl
))
5633 msg
= G_("sorry: semantics of inline variable "
5634 "%q#D are wrong (you%'ll wind up with "
5635 "multiple copies)");
5637 msg
= G_("sorry: semantics of inline function "
5638 "static data %q#D are wrong (you%'ll wind "
5639 "up with multiple copies)");
5640 if (warning_at (DECL_SOURCE_LOCATION (decl
), 0,
5642 inform (DECL_SOURCE_LOCATION (decl
),
5643 "you can work around this by removing the initializer");
5649 /* Issue an error message if DECL is an uninitialized const variable.
5650 CONSTEXPR_CONTEXT_P is true when the function is called in a constexpr
5651 context from potential_constant_expression. Returns true if all is well,
5655 check_for_uninitialized_const_var (tree decl
, bool constexpr_context_p
,
5656 tsubst_flags_t complain
)
5658 tree type
= strip_array_types (TREE_TYPE (decl
));
5660 /* ``Unless explicitly declared extern, a const object does not have
5661 external linkage and must be initialized. ($8.4; $12.1)'' ARM
5664 && !TYPE_REF_P (type
)
5665 && (constexpr_context_p
5666 || CP_TYPE_CONST_P (type
) || var_in_constexpr_fn (decl
))
5667 && !DECL_NONTRIVIALLY_INITIALIZED_P (decl
))
5669 tree field
= default_init_uninitialized_part (type
);
5673 if (!constexpr_context_p
)
5675 if (CP_TYPE_CONST_P (type
))
5677 if (complain
& tf_error
)
5678 permerror (DECL_SOURCE_LOCATION (decl
),
5679 "uninitialized const %qD", decl
);
5683 if (!is_instantiation_of_constexpr (current_function_decl
)
5684 && (complain
& tf_error
))
5685 error_at (DECL_SOURCE_LOCATION (decl
),
5686 "uninitialized variable %qD in %<constexpr%> "
5688 cp_function_chain
->invalid_constexpr
= true;
5691 else if (complain
& tf_error
)
5692 error_at (DECL_SOURCE_LOCATION (decl
),
5693 "uninitialized variable %qD in %<constexpr%> context",
5696 if (CLASS_TYPE_P (type
) && (complain
& tf_error
))
5698 tree defaulted_ctor
;
5700 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (type
)),
5701 "%q#T has no user-provided default constructor", type
);
5702 defaulted_ctor
= in_class_defaulted_default_constructor (type
);
5704 inform (DECL_SOURCE_LOCATION (defaulted_ctor
),
5705 "constructor is not user-provided because it is "
5706 "explicitly defaulted in the class body");
5707 inform (DECL_SOURCE_LOCATION (field
),
5708 "and the implicitly-defined constructor does not "
5709 "initialize %q#D", field
);
5718 /* Structure holding the current initializer being processed by reshape_init.
5719 CUR is a pointer to the current element being processed, END is a pointer
5720 after the last element present in the initializer. */
5723 constructor_elt
*cur
;
5724 constructor_elt
*end
;
5727 static tree
reshape_init_r (tree
, reshape_iter
*, bool, tsubst_flags_t
);
5729 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
5730 returned is the next FIELD_DECL (possibly FIELD itself) that can be
5731 initialized. If there are no more such fields, the return value
5735 next_initializable_field (tree field
)
5738 && (TREE_CODE (field
) != FIELD_DECL
5739 || DECL_UNNAMED_BIT_FIELD (field
)
5740 || (DECL_ARTIFICIAL (field
)
5741 && !(cxx_dialect
>= cxx17
&& DECL_FIELD_IS_BASE (field
)))))
5742 field
= DECL_CHAIN (field
);
5747 /* Return true for [dcl.init.list] direct-list-initialization from
5748 single element of enumeration with a fixed underlying type. */
5751 is_direct_enum_init (tree type
, tree init
)
5753 if (cxx_dialect
>= cxx17
5754 && TREE_CODE (type
) == ENUMERAL_TYPE
5755 && ENUM_FIXED_UNDERLYING_TYPE_P (type
)
5756 && TREE_CODE (init
) == CONSTRUCTOR
5757 && CONSTRUCTOR_IS_DIRECT_INIT (init
)
5758 && CONSTRUCTOR_NELTS (init
) == 1)
5763 /* Subroutine of reshape_init_array and reshape_init_vector, which does
5764 the actual work. ELT_TYPE is the element type of the array. MAX_INDEX is an
5765 INTEGER_CST representing the size of the array minus one (the maximum index),
5766 or NULL_TREE if the array was declared without specifying the size. D is
5767 the iterator within the constructor. */
5770 reshape_init_array_1 (tree elt_type
, tree max_index
, reshape_iter
*d
,
5771 tsubst_flags_t complain
)
5774 bool sized_array_p
= (max_index
&& TREE_CONSTANT (max_index
));
5775 unsigned HOST_WIDE_INT max_index_cst
= 0;
5776 unsigned HOST_WIDE_INT index
;
5778 /* The initializer for an array is always a CONSTRUCTOR. */
5779 new_init
= build_constructor (init_list_type_node
, NULL
);
5783 /* Minus 1 is used for zero sized arrays. */
5784 if (integer_all_onesp (max_index
))
5787 if (tree_fits_uhwi_p (max_index
))
5788 max_index_cst
= tree_to_uhwi (max_index
);
5789 /* sizetype is sign extended, not zero extended. */
5791 max_index_cst
= tree_to_uhwi (fold_convert (size_type_node
, max_index
));
5794 /* Loop until there are no more initializers. */
5796 d
->cur
!= d
->end
&& (!sized_array_p
|| index
<= max_index_cst
);
5800 constructor_elt
*old_cur
= d
->cur
;
5802 check_array_designated_initializer (d
->cur
, index
);
5803 elt_init
= reshape_init_r (elt_type
, d
, /*first_initializer_p=*/false,
5805 if (elt_init
== error_mark_node
)
5806 return error_mark_node
;
5807 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init
),
5808 size_int (index
), elt_init
);
5809 if (!TREE_CONSTANT (elt_init
))
5810 TREE_CONSTANT (new_init
) = false;
5812 /* This can happen with an invalid initializer (c++/54501). */
5813 if (d
->cur
== old_cur
&& !sized_array_p
)
5820 /* Subroutine of reshape_init_r, processes the initializers for arrays.
5821 Parameters are the same of reshape_init_r. */
5824 reshape_init_array (tree type
, reshape_iter
*d
, tsubst_flags_t complain
)
5826 tree max_index
= NULL_TREE
;
5828 gcc_assert (TREE_CODE (type
) == ARRAY_TYPE
);
5830 if (TYPE_DOMAIN (type
))
5831 max_index
= array_type_nelts (type
);
5833 return reshape_init_array_1 (TREE_TYPE (type
), max_index
, d
, complain
);
5836 /* Subroutine of reshape_init_r, processes the initializers for vectors.
5837 Parameters are the same of reshape_init_r. */
5840 reshape_init_vector (tree type
, reshape_iter
*d
, tsubst_flags_t complain
)
5842 tree max_index
= NULL_TREE
;
5844 gcc_assert (VECTOR_TYPE_P (type
));
5846 if (COMPOUND_LITERAL_P (d
->cur
->value
))
5848 tree value
= d
->cur
->value
;
5849 if (!same_type_p (TREE_TYPE (value
), type
))
5851 if (complain
& tf_error
)
5852 error ("invalid type %qT as initializer for a vector of type %qT",
5853 TREE_TYPE (d
->cur
->value
), type
);
5854 value
= error_mark_node
;
5860 /* For a vector, we initialize it as an array of the appropriate size. */
5861 if (VECTOR_TYPE_P (type
))
5862 max_index
= size_int (TYPE_VECTOR_SUBPARTS (type
) - 1);
5864 return reshape_init_array_1 (TREE_TYPE (type
), max_index
, d
, complain
);
5867 /* Subroutine of reshape_init_r, processes the initializers for classes
5868 or union. Parameters are the same of reshape_init_r. */
5871 reshape_init_class (tree type
, reshape_iter
*d
, bool first_initializer_p
,
5872 tsubst_flags_t complain
)
5877 gcc_assert (CLASS_TYPE_P (type
));
5879 /* The initializer for a class is always a CONSTRUCTOR. */
5880 new_init
= build_constructor (init_list_type_node
, NULL
);
5881 field
= next_initializable_field (TYPE_FIELDS (type
));
5887 An initializer for an aggregate member that is an
5888 empty class shall have the form of an empty
5889 initializer-list {}. */
5890 if (!first_initializer_p
)
5892 if (complain
& tf_error
)
5893 error ("initializer for %qT must be brace-enclosed", type
);
5894 return error_mark_node
;
5899 /* Loop through the initializable fields, gathering initializers. */
5900 while (d
->cur
!= d
->end
)
5903 constructor_elt
*old_cur
= d
->cur
;
5905 /* Handle designated initializers, as an extension. */
5908 if (d
->cur
->index
== error_mark_node
)
5909 return error_mark_node
;
5911 if (TREE_CODE (d
->cur
->index
) == FIELD_DECL
)
5913 /* We already reshaped this. */
5914 if (field
!= d
->cur
->index
)
5916 tree id
= DECL_NAME (d
->cur
->index
);
5918 gcc_checking_assert (d
->cur
->index
5919 == get_class_binding (type
, id
, false));
5920 field
= d
->cur
->index
;
5923 else if (TREE_CODE (d
->cur
->index
) == IDENTIFIER_NODE
)
5924 field
= get_class_binding (type
, d
->cur
->index
, false);
5927 if (complain
& tf_error
)
5928 error ("%<[%E] =%> used in a GNU-style designated initializer"
5929 " for class %qT", d
->cur
->index
, type
);
5930 return error_mark_node
;
5933 if (!field
|| TREE_CODE (field
) != FIELD_DECL
)
5935 if (complain
& tf_error
)
5936 error ("%qT has no non-static data member named %qD", type
,
5938 return error_mark_node
;
5942 /* If we processed all the member of the class, we are done. */
5946 field_init
= reshape_init_r (TREE_TYPE (field
), d
,
5947 /*first_initializer_p=*/false, complain
);
5948 if (field_init
== error_mark_node
)
5949 return error_mark_node
;
5951 if (d
->cur
== old_cur
&& d
->cur
->index
)
5953 /* This can happen with an invalid initializer for a flexible
5954 array member (c++/54441). */
5955 if (complain
& tf_error
)
5956 error ("invalid initializer for %q#D", field
);
5957 return error_mark_node
;
5960 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init
), field
, field_init
);
5964 When a union is initialized with a brace-enclosed
5965 initializer, the braces shall only contain an
5966 initializer for the first member of the union. */
5967 if (TREE_CODE (type
) == UNION_TYPE
)
5970 field
= next_initializable_field (DECL_CHAIN (field
));
5976 /* Subroutine of reshape_init_r. We're in a context where C99 initializer
5977 designators are not valid; either complain or return true to indicate
5978 that reshape_init_r should return error_mark_node. */
5981 has_designator_problem (reshape_iter
*d
, tsubst_flags_t complain
)
5985 if (complain
& tf_error
)
5986 error ("C99 designator %qE outside aggregate initializer",
5994 /* Subroutine of reshape_init, which processes a single initializer (part of
5995 a CONSTRUCTOR). TYPE is the type of the variable being initialized, D is the
5996 iterator within the CONSTRUCTOR which points to the initializer to process.
5997 FIRST_INITIALIZER_P is true if this is the first initializer of the
5998 outermost CONSTRUCTOR node. */
6001 reshape_init_r (tree type
, reshape_iter
*d
, bool first_initializer_p
,
6002 tsubst_flags_t complain
)
6004 tree init
= d
->cur
->value
;
6006 if (error_operand_p (init
))
6007 return error_mark_node
;
6009 if (first_initializer_p
&& !CP_AGGREGATE_TYPE_P (type
)
6010 && has_designator_problem (d
, complain
))
6011 return error_mark_node
;
6013 tree stripped_init
= tree_strip_any_location_wrapper (init
);
6015 if (TREE_CODE (type
) == COMPLEX_TYPE
)
6017 /* A complex type can be initialized from one or two initializers,
6018 but braces are not elided. */
6020 if (BRACE_ENCLOSED_INITIALIZER_P (stripped_init
))
6022 if (CONSTRUCTOR_NELTS (stripped_init
) > 2)
6024 if (complain
& tf_error
)
6025 error ("too many initializers for %qT", type
);
6027 return error_mark_node
;
6030 else if (first_initializer_p
&& d
->cur
!= d
->end
)
6032 vec
<constructor_elt
, va_gc
> *v
= 0;
6033 CONSTRUCTOR_APPEND_ELT (v
, NULL_TREE
, init
);
6034 CONSTRUCTOR_APPEND_ELT (v
, NULL_TREE
, d
->cur
->value
);
6035 if (has_designator_problem (d
, complain
))
6036 return error_mark_node
;
6038 init
= build_constructor (init_list_type_node
, v
);
6043 /* A non-aggregate type is always initialized with a single
6045 if (!CP_AGGREGATE_TYPE_P (type
))
6047 /* It is invalid to initialize a non-aggregate type with a
6048 brace-enclosed initializer before C++0x.
6049 We need to check for BRACE_ENCLOSED_INITIALIZER_P here because
6050 of g++.old-deja/g++.mike/p7626.C: a pointer-to-member constant is
6051 a CONSTRUCTOR (with a record type). */
6052 if (TREE_CODE (stripped_init
) == CONSTRUCTOR
6053 /* Don't complain about a capture-init. */
6054 && !CONSTRUCTOR_IS_DIRECT_INIT (stripped_init
)
6055 && BRACE_ENCLOSED_INITIALIZER_P (stripped_init
)) /* p7626.C */
6057 if (SCALAR_TYPE_P (type
))
6059 if (cxx_dialect
< cxx11
6060 /* Isn't value-initialization. */
6061 || CONSTRUCTOR_NELTS (stripped_init
) > 0)
6063 if (complain
& tf_error
)
6064 error ("braces around scalar initializer for type %qT",
6066 init
= error_mark_node
;
6070 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS
);
6077 /* "If T is a class type and the initializer list has a single element of
6078 type cv U, where U is T or a class derived from T, the object is
6079 initialized from that element." Even if T is an aggregate. */
6080 if (cxx_dialect
>= cxx11
&& (CLASS_TYPE_P (type
) || VECTOR_TYPE_P (type
))
6081 && first_initializer_p
6082 && d
->end
- d
->cur
== 1
6083 && reference_related_p (type
, TREE_TYPE (init
)))
6091 All implicit type conversions (clause _conv_) are considered when
6092 initializing the aggregate member with an initializer from an
6093 initializer-list. If the initializer can initialize a member,
6094 the member is initialized. Otherwise, if the member is itself a
6095 non-empty subaggregate, brace elision is assumed and the
6096 initializer is considered for the initialization of the first
6097 member of the subaggregate. */
6098 if (TREE_CODE (init
) != CONSTRUCTOR
6099 /* But don't try this for the first initializer, since that would be
6100 looking through the outermost braces; A a2 = { a1 }; is not a
6101 valid aggregate initialization. */
6102 && !first_initializer_p
6103 && (same_type_ignoring_top_level_qualifiers_p (type
, TREE_TYPE (init
))
6104 || can_convert_arg (type
, TREE_TYPE (init
), init
, LOOKUP_NORMAL
,
6111 /* [dcl.init.string]
6113 A char array (whether plain char, signed char, or unsigned char)
6114 can be initialized by a string-literal (optionally enclosed in
6115 braces); a wchar_t array can be initialized by a wide
6116 string-literal (optionally enclosed in braces). */
6117 if (TREE_CODE (type
) == ARRAY_TYPE
6118 && char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (type
))))
6120 tree str_init
= init
;
6121 tree stripped_str_init
= stripped_init
;
6123 /* Strip one level of braces if and only if they enclose a single
6124 element (as allowed by [dcl.init.string]). */
6125 if (!first_initializer_p
6126 && TREE_CODE (stripped_str_init
) == CONSTRUCTOR
6127 && CONSTRUCTOR_NELTS (stripped_str_init
) == 1)
6129 str_init
= (*CONSTRUCTOR_ELTS (stripped_str_init
))[0].value
;
6130 stripped_str_init
= tree_strip_any_location_wrapper (str_init
);
6133 /* If it's a string literal, then it's the initializer for the array
6134 as a whole. Otherwise, continue with normal initialization for
6135 array types (one value per array element). */
6136 if (TREE_CODE (stripped_str_init
) == STRING_CST
)
6138 if (has_designator_problem (d
, complain
))
6139 return error_mark_node
;
6145 /* The following cases are about aggregates. If we are not within a full
6146 initializer already, and there is not a CONSTRUCTOR, it means that there
6147 is a missing set of braces (that is, we are processing the case for
6148 which reshape_init exists). */
6149 if (!first_initializer_p
)
6151 if (TREE_CODE (stripped_init
) == CONSTRUCTOR
)
6153 if (TREE_TYPE (init
) && TYPE_PTRMEMFUNC_P (TREE_TYPE (init
)))
6154 /* There is no need to reshape pointer-to-member function
6155 initializers, as they are always constructed correctly
6156 by the front end. */
6158 else if (COMPOUND_LITERAL_P (stripped_init
))
6159 /* For a nested compound literal, there is no need to reshape since
6160 brace elision is not allowed. Even if we decided to allow it,
6161 we should add a call to reshape_init in finish_compound_literal,
6162 before calling digest_init, so changing this code would still
6163 not be necessary. */
6164 gcc_assert (!BRACE_ENCLOSED_INITIALIZER_P (stripped_init
));
6168 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (stripped_init
));
6169 return reshape_init (type
, init
, complain
);
6173 if (complain
& tf_warning
)
6174 warning (OPT_Wmissing_braces
,
6175 "missing braces around initializer for %qT",
6179 /* Dispatch to specialized routines. */
6180 if (CLASS_TYPE_P (type
))
6181 return reshape_init_class (type
, d
, first_initializer_p
, complain
);
6182 else if (TREE_CODE (type
) == ARRAY_TYPE
)
6183 return reshape_init_array (type
, d
, complain
);
6184 else if (VECTOR_TYPE_P (type
))
6185 return reshape_init_vector (type
, d
, complain
);
6190 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
6191 brace-enclosed aggregate initializer.
6193 INIT is the CONSTRUCTOR containing the list of initializers describing
6194 a brace-enclosed initializer for an entity of the indicated aggregate TYPE.
6195 It may not presently match the shape of the TYPE; for example:
6197 struct S { int a; int b; };
6198 struct S a[] = { 1, 2, 3, 4 };
6200 Here INIT will hold a vector of four elements, rather than a
6201 vector of two elements, each itself a vector of two elements. This
6202 routine transforms INIT from the former form into the latter. The
6203 revised CONSTRUCTOR node is returned. */
6206 reshape_init (tree type
, tree init
, tsubst_flags_t complain
)
6208 vec
<constructor_elt
, va_gc
> *v
;
6212 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init
));
6214 v
= CONSTRUCTOR_ELTS (init
);
6216 /* An empty constructor does not need reshaping, and it is always a valid
6218 if (vec_safe_is_empty (v
))
6221 /* Handle [dcl.init.list] direct-list-initialization from
6222 single element of enumeration with a fixed underlying type. */
6223 if (is_direct_enum_init (type
, init
))
6225 tree elt
= CONSTRUCTOR_ELT (init
, 0)->value
;
6226 type
= cv_unqualified (type
);
6227 if (check_narrowing (ENUM_UNDERLYING_TYPE (type
), elt
, complain
))
6229 warning_sentinel
w (warn_useless_cast
);
6230 warning_sentinel
w2 (warn_ignored_qualifiers
);
6231 return cp_build_c_cast (type
, elt
, tf_warning_or_error
);
6234 return error_mark_node
;
6237 /* Recurse on this CONSTRUCTOR. */
6239 d
.end
= d
.cur
+ v
->length ();
6241 new_init
= reshape_init_r (type
, &d
, true, complain
);
6242 if (new_init
== error_mark_node
)
6243 return error_mark_node
;
6245 /* Make sure all the element of the constructor were used. Otherwise,
6246 issue an error about exceeding initializers. */
6249 if (complain
& tf_error
)
6250 error ("too many initializers for %qT", type
);
6251 return error_mark_node
;
6254 if (CONSTRUCTOR_IS_DIRECT_INIT (init
)
6255 && BRACE_ENCLOSED_INITIALIZER_P (new_init
))
6256 CONSTRUCTOR_IS_DIRECT_INIT (new_init
) = true;
6261 /* Verify array initializer. Returns true if errors have been reported. */
6264 check_array_initializer (tree decl
, tree type
, tree init
)
6266 tree element_type
= TREE_TYPE (type
);
6268 /* The array type itself need not be complete, because the
6269 initializer may tell us how many elements are in the array.
6270 But, the elements of the array must be complete. */
6271 if (!COMPLETE_TYPE_P (complete_type (element_type
)))
6274 error_at (DECL_SOURCE_LOCATION (decl
),
6275 "elements of array %q#D have incomplete type", decl
);
6277 error ("elements of array %q#T have incomplete type", type
);
6280 /* A compound literal can't have variable size. */
6282 && ((COMPLETE_TYPE_P (type
) && !TREE_CONSTANT (TYPE_SIZE (type
)))
6283 || !TREE_CONSTANT (TYPE_SIZE (element_type
))))
6285 error ("variable-sized compound literal");
6291 /* Subroutine of check_initializer; args are passed down from that function.
6292 Set stmts_are_full_exprs_p to 1 across a call to build_aggr_init. */
6295 build_aggr_init_full_exprs (tree decl
, tree init
, int flags
)
6298 gcc_assert (stmts_are_full_exprs_p ());
6299 return build_aggr_init (decl
, init
, flags
, tf_warning_or_error
);
6302 /* Verify INIT (the initializer for DECL), and record the
6303 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
6304 grok_reference_init.
6306 If the return value is non-NULL, it is an expression that must be
6307 evaluated dynamically to initialize DECL. */
6310 check_initializer (tree decl
, tree init
, int flags
, vec
<tree
, va_gc
> **cleanups
)
6312 tree type
= TREE_TYPE (decl
);
6313 tree init_code
= NULL
;
6316 /* Things that are going to be initialized need to have complete
6318 TREE_TYPE (decl
) = type
= complete_type (TREE_TYPE (decl
));
6320 if (DECL_HAS_VALUE_EXPR_P (decl
))
6322 /* A variable with DECL_HAS_VALUE_EXPR_P set is just a placeholder,
6323 it doesn't have storage to be initialized. */
6324 gcc_assert (init
== NULL_TREE
);
6328 if (type
== error_mark_node
)
6329 /* We will have already complained. */
6332 if (TREE_CODE (type
) == ARRAY_TYPE
)
6334 if (check_array_initializer (decl
, type
, init
))
6337 else if (!COMPLETE_TYPE_P (type
))
6339 error_at (DECL_SOURCE_LOCATION (decl
),
6340 "%q#D has incomplete type", decl
);
6341 TREE_TYPE (decl
) = error_mark_node
;
6345 /* There is no way to make a variable-sized class type in GNU C++. */
6346 gcc_assert (TREE_CONSTANT (TYPE_SIZE (type
)));
6348 if (init
&& BRACE_ENCLOSED_INITIALIZER_P (init
))
6350 int init_len
= CONSTRUCTOR_NELTS (init
);
6351 if (SCALAR_TYPE_P (type
))
6355 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS
);
6356 init
= build_zero_init (type
, NULL_TREE
, false);
6358 else if (init_len
!= 1 && TREE_CODE (type
) != COMPLEX_TYPE
)
6360 error_at (cp_expr_loc_or_loc (init
, DECL_SOURCE_LOCATION (decl
)),
6361 "scalar object %qD requires one element in "
6362 "initializer", decl
);
6363 TREE_TYPE (decl
) = error_mark_node
;
6369 if (TREE_CODE (decl
) == CONST_DECL
)
6371 gcc_assert (!TYPE_REF_P (type
));
6373 DECL_INITIAL (decl
) = init
;
6375 gcc_assert (init
!= NULL_TREE
);
6378 else if (!init
&& DECL_REALLY_EXTERN (decl
))
6380 else if (init
|| type_build_ctor_call (type
)
6381 || TYPE_REF_P (type
))
6383 if (TYPE_REF_P (type
))
6385 init
= grok_reference_init (decl
, type
, init
, flags
);
6386 flags
|= LOOKUP_ALREADY_DIGESTED
;
6389 check_for_uninitialized_const_var (decl
, /*constexpr_context_p=*/false,
6390 tf_warning_or_error
);
6391 /* Do not reshape constructors of vectors (they don't need to be
6393 else if (BRACE_ENCLOSED_INITIALIZER_P (init
))
6395 if (is_std_init_list (type
))
6397 init
= perform_implicit_conversion (type
, init
,
6398 tf_warning_or_error
);
6399 flags
|= LOOKUP_ALREADY_DIGESTED
;
6401 else if (TYPE_NON_AGGREGATE_CLASS (type
))
6403 /* Don't reshape if the class has constructors. */
6404 if (cxx_dialect
== cxx98
)
6405 error_at (cp_expr_loc_or_loc (init
, DECL_SOURCE_LOCATION (decl
)),
6406 "in C++98 %qD must be initialized by "
6407 "constructor, not by %<{...}%>",
6410 else if (VECTOR_TYPE_P (type
) && TYPE_VECTOR_OPAQUE (type
))
6412 error ("opaque vector types cannot be initialized");
6413 init
= error_mark_node
;
6417 init
= reshape_init (type
, init
, tf_warning_or_error
);
6418 flags
|= LOOKUP_NO_NARROWING
;
6421 else if (TREE_CODE (init
) == TREE_LIST
6422 && TREE_TYPE (init
) != unknown_type_node
6423 && !MAYBE_CLASS_TYPE_P (type
))
6425 gcc_assert (TREE_CODE (decl
) != RESULT_DECL
);
6427 /* We get here with code like `int a (2);' */
6428 init
= build_x_compound_expr_from_list (init
, ELK_INIT
,
6429 tf_warning_or_error
);
6432 /* If DECL has an array type without a specific bound, deduce the
6433 array size from the initializer. */
6434 maybe_deduce_size_from_array_init (decl
, init
);
6435 type
= TREE_TYPE (decl
);
6436 if (type
== error_mark_node
)
6439 if (((type_build_ctor_call (type
) || CLASS_TYPE_P (type
))
6440 && !(flags
& LOOKUP_ALREADY_DIGESTED
)
6441 && !(init
&& BRACE_ENCLOSED_INITIALIZER_P (init
)
6442 && CP_AGGREGATE_TYPE_P (type
)
6443 && (CLASS_TYPE_P (type
)
6444 || !TYPE_NEEDS_CONSTRUCTING (type
)
6445 || type_has_extended_temps (type
))))
6446 || (DECL_DECOMPOSITION_P (decl
) && TREE_CODE (type
) == ARRAY_TYPE
))
6448 init_code
= build_aggr_init_full_exprs (decl
, init
, flags
);
6450 /* A constructor call is a non-trivial initializer even if
6451 it isn't explicitly written. */
6452 if (TREE_SIDE_EFFECTS (init_code
))
6453 DECL_NONTRIVIALLY_INITIALIZED_P (decl
) = true;
6455 /* If this is a constexpr initializer, expand_default_init will
6456 have returned an INIT_EXPR rather than a CALL_EXPR. In that
6457 case, pull the initializer back out and pass it down into
6458 store_init_value. */
6459 while (TREE_CODE (init_code
) == EXPR_STMT
6460 || TREE_CODE (init_code
) == CONVERT_EXPR
)
6461 init_code
= TREE_OPERAND (init_code
, 0);
6462 if (TREE_CODE (init_code
) == INIT_EXPR
)
6464 init
= TREE_OPERAND (init_code
, 1);
6465 init_code
= NULL_TREE
;
6466 /* Don't call digest_init; it's unnecessary and will complain
6467 about aggregate initialization of non-aggregate classes. */
6468 flags
|= LOOKUP_ALREADY_DIGESTED
;
6470 else if (DECL_DECLARED_CONSTEXPR_P (decl
))
6472 /* Declared constexpr, but no suitable initializer; massage
6473 init appropriately so we can pass it into store_init_value
6475 if (CLASS_TYPE_P (type
)
6476 && (!init
|| TREE_CODE (init
) == TREE_LIST
))
6478 init
= build_functional_cast (type
, init
, tf_none
);
6479 if (TREE_CODE (init
) == TARGET_EXPR
)
6480 TARGET_EXPR_DIRECT_INIT_P (init
) = true;
6482 init_code
= NULL_TREE
;
6488 if (init
&& TREE_CODE (init
) != TREE_VEC
)
6490 /* In aggregate initialization of a variable, each element
6491 initialization is a full-expression because there is no
6492 enclosing expression. */
6493 gcc_assert (stmts_are_full_exprs_p ());
6495 init_code
= store_init_value (decl
, init
, cleanups
, flags
);
6497 if (DECL_INITIAL (decl
)
6498 && TREE_CODE (DECL_INITIAL (decl
)) == CONSTRUCTOR
6499 && !vec_safe_is_empty (CONSTRUCTOR_ELTS (DECL_INITIAL (decl
))))
6501 tree elt
= CONSTRUCTOR_ELTS (DECL_INITIAL (decl
))->last ().value
;
6502 if (TREE_CODE (TREE_TYPE (elt
)) == ARRAY_TYPE
6503 && TYPE_SIZE (TREE_TYPE (elt
)) == NULL_TREE
)
6504 cp_complete_array_type (&TREE_TYPE (elt
), elt
, false);
6507 if (pedantic
&& TREE_CODE (type
) == ARRAY_TYPE
6508 && DECL_INITIAL (decl
)
6509 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
6510 && PAREN_STRING_LITERAL_P (DECL_INITIAL (decl
)))
6511 warning_at (cp_expr_loc_or_loc (DECL_INITIAL (decl
),
6512 DECL_SOURCE_LOCATION (decl
)),
6513 0, "array %qD initialized by parenthesized "
6514 "string literal %qE",
6515 decl
, DECL_INITIAL (decl
));
6521 if (CLASS_TYPE_P (core_type
= strip_array_types (type
))
6522 && (CLASSTYPE_READONLY_FIELDS_NEED_INIT (core_type
)
6523 || CLASSTYPE_REF_FIELDS_NEED_INIT (core_type
)))
6524 diagnose_uninitialized_cst_or_ref_member (core_type
, /*using_new=*/false,
6527 check_for_uninitialized_const_var (decl
, /*constexpr_context_p=*/false,
6528 tf_warning_or_error
);
6531 if (init
&& init
!= error_mark_node
)
6532 init_code
= build2 (INIT_EXPR
, type
, decl
, init
);
6536 /* We might have set these in cp_finish_decl. */
6537 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl
) = false;
6538 TREE_CONSTANT (decl
) = false;
6542 && (DECL_IN_AGGR_P (decl
)
6543 && DECL_INITIALIZED_IN_CLASS_P (decl
)
6544 && !DECL_VAR_DECLARED_INLINE_P (decl
)))
6546 static int explained
= 0;
6548 if (cxx_dialect
< cxx11
)
6549 error ("initializer invalid for static member with constructor");
6550 else if (cxx_dialect
< cxx17
)
6551 error ("non-constant in-class initialization invalid for static "
6552 "member %qD", decl
);
6554 error ("non-constant in-class initialization invalid for non-inline "
6555 "static member %qD", decl
);
6558 inform (input_location
,
6559 "(an out of class initialization is required)");
6568 /* If DECL is not a local variable, give it RTL. */
6571 make_rtl_for_nonlocal_decl (tree decl
, tree init
, const char* asmspec
)
6573 int toplev
= toplevel_bindings_p ();
6576 /* Set the DECL_ASSEMBLER_NAME for the object. */
6579 /* The `register' keyword, when used together with an
6580 asm-specification, indicates that the variable should be
6581 placed in a particular register. */
6582 if (VAR_P (decl
) && DECL_REGISTER (decl
))
6584 set_user_assembler_name (decl
, asmspec
);
6585 DECL_HARD_REGISTER (decl
) = 1;
6589 if (TREE_CODE (decl
) == FUNCTION_DECL
6590 && fndecl_built_in_p (decl
, BUILT_IN_NORMAL
))
6591 set_builtin_user_assembler_name (decl
, asmspec
);
6592 set_user_assembler_name (decl
, asmspec
);
6596 /* Handle non-variables up front. */
6599 rest_of_decl_compilation (decl
, toplev
, at_eof
);
6603 /* If we see a class member here, it should be a static data
6605 if (DECL_LANG_SPECIFIC (decl
) && DECL_IN_AGGR_P (decl
))
6607 gcc_assert (TREE_STATIC (decl
));
6608 /* An in-class declaration of a static data member should be
6609 external; it is only a declaration, and not a definition. */
6610 if (init
== NULL_TREE
)
6611 gcc_assert (DECL_EXTERNAL (decl
)
6612 || !TREE_PUBLIC (decl
)
6613 || DECL_INLINE_VAR_P (decl
));
6616 /* We don't create any RTL for local variables. */
6617 if (DECL_FUNCTION_SCOPE_P (decl
) && !TREE_STATIC (decl
))
6620 /* We defer emission of local statics until the corresponding
6621 DECL_EXPR is expanded. But with constexpr its function might never
6622 be expanded, so go ahead and tell cgraph about the variable now. */
6623 defer_p
= ((DECL_FUNCTION_SCOPE_P (decl
)
6624 && !var_in_maybe_constexpr_fn (decl
))
6625 || DECL_VIRTUAL_P (decl
));
6627 /* Defer template instantiations. */
6628 if (DECL_LANG_SPECIFIC (decl
)
6629 && DECL_IMPLICIT_INSTANTIATION (decl
))
6632 /* If we're not deferring, go ahead and assemble the variable. */
6634 rest_of_decl_compilation (decl
, toplev
, at_eof
);
6637 /* walk_tree helper for wrap_temporary_cleanups, below. */
6640 wrap_cleanups_r (tree
*stmt_p
, int *walk_subtrees
, void *data
)
6642 /* Stop at types or full-expression boundaries. */
6643 if (TYPE_P (*stmt_p
)
6644 || TREE_CODE (*stmt_p
) == CLEANUP_POINT_EXPR
)
6650 if (TREE_CODE (*stmt_p
) == TARGET_EXPR
)
6652 tree guard
= (tree
)data
;
6653 tree tcleanup
= TARGET_EXPR_CLEANUP (*stmt_p
);
6655 tcleanup
= build2 (TRY_CATCH_EXPR
, void_type_node
, tcleanup
, guard
);
6656 /* Tell honor_protect_cleanup_actions to handle this as a separate
6658 TRY_CATCH_IS_CLEANUP (tcleanup
) = 1;
6660 TARGET_EXPR_CLEANUP (*stmt_p
) = tcleanup
;
6666 /* We're initializing a local variable which has a cleanup GUARD. If there
6667 are any temporaries used in the initializer INIT of this variable, we
6668 need to wrap their cleanups with TRY_CATCH_EXPR (, GUARD) so that the
6669 variable will be cleaned up properly if one of them throws.
6671 Unfortunately, there's no way to express this properly in terms of
6672 nesting, as the regions for the temporaries overlap the region for the
6673 variable itself; if there are two temporaries, the variable needs to be
6674 the first thing destroyed if either of them throws. However, we only
6675 want to run the variable's cleanup if it actually got constructed. So
6676 we need to guard the temporary cleanups with the variable's cleanup if
6677 they are run on the normal path, but not if they are run on the
6678 exceptional path. We implement this by telling
6679 honor_protect_cleanup_actions to strip the variable cleanup from the
6680 exceptional path. */
6683 wrap_temporary_cleanups (tree init
, tree guard
)
6685 cp_walk_tree_without_duplicates (&init
, wrap_cleanups_r
, (void *)guard
);
6688 /* Generate code to initialize DECL (a local variable). */
6691 initialize_local_var (tree decl
, tree init
)
6693 tree type
= TREE_TYPE (decl
);
6697 gcc_assert (VAR_P (decl
)
6698 || TREE_CODE (decl
) == RESULT_DECL
);
6699 gcc_assert (!TREE_STATIC (decl
));
6701 if (DECL_SIZE (decl
) == NULL_TREE
)
6703 /* If we used it already as memory, it must stay in memory. */
6704 DECL_INITIAL (decl
) = NULL_TREE
;
6705 TREE_ADDRESSABLE (decl
) = TREE_USED (decl
);
6709 if (type
== error_mark_node
)
6712 /* Compute and store the initial value. */
6713 already_used
= TREE_USED (decl
) || TREE_USED (type
);
6714 if (TREE_USED (type
))
6715 DECL_READ_P (decl
) = 1;
6717 /* Generate a cleanup, if necessary. */
6718 cleanup
= cxx_maybe_build_cleanup (decl
, tf_warning_or_error
);
6720 /* Perform the initialization. */
6723 tree rinit
= (TREE_CODE (init
) == INIT_EXPR
6724 ? TREE_OPERAND (init
, 1) : NULL_TREE
);
6725 if (rinit
&& !TREE_SIDE_EFFECTS (rinit
))
6727 /* Stick simple initializers in DECL_INITIAL so that
6728 -Wno-init-self works (c++/34772). */
6729 gcc_assert (TREE_OPERAND (init
, 0) == decl
);
6730 DECL_INITIAL (decl
) = rinit
;
6732 if (warn_init_self
&& TYPE_REF_P (type
))
6736 warning_at (DECL_SOURCE_LOCATION (decl
),
6738 "reference %qD is initialized with itself", decl
);
6743 int saved_stmts_are_full_exprs_p
;
6745 /* If we're only initializing a single object, guard the
6746 destructors of any temporaries used in its initializer with
6747 its destructor. This isn't right for arrays because each
6748 element initialization is a full-expression. */
6749 if (cleanup
&& TREE_CODE (type
) != ARRAY_TYPE
)
6750 wrap_temporary_cleanups (init
, cleanup
);
6752 gcc_assert (building_stmt_list_p ());
6753 saved_stmts_are_full_exprs_p
= stmts_are_full_exprs_p ();
6754 current_stmt_tree ()->stmts_are_full_exprs_p
= 1;
6755 finish_expr_stmt (init
);
6756 current_stmt_tree ()->stmts_are_full_exprs_p
=
6757 saved_stmts_are_full_exprs_p
;
6761 /* Set this to 0 so we can tell whether an aggregate which was
6762 initialized was ever used. Don't do this if it has a
6763 destructor, so we don't complain about the 'resource
6764 allocation is initialization' idiom. Now set
6765 attribute((unused)) on types so decls of that type will be
6766 marked used. (see TREE_USED, above.) */
6767 if (TYPE_NEEDS_CONSTRUCTING (type
)
6769 && TYPE_HAS_TRIVIAL_DESTRUCTOR (type
)
6770 && DECL_NAME (decl
))
6771 TREE_USED (decl
) = 0;
6772 else if (already_used
)
6773 TREE_USED (decl
) = 1;
6776 finish_decl_cleanup (decl
, cleanup
);
6779 /* DECL is a VAR_DECL for a compiler-generated variable with static
6780 storage duration (like a virtual table) whose initializer is a
6781 compile-time constant. Initialize the variable and provide it to the
6785 initialize_artificial_var (tree decl
, vec
<constructor_elt
, va_gc
> *v
)
6788 gcc_assert (DECL_ARTIFICIAL (decl
));
6789 init
= build_constructor (TREE_TYPE (decl
), v
);
6790 gcc_assert (TREE_CODE (init
) == CONSTRUCTOR
);
6791 DECL_INITIAL (decl
) = init
;
6792 DECL_INITIALIZED_P (decl
) = 1;
6793 /* Mark the decl as constexpr so that we can access its content
6795 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl
) = true;
6796 DECL_DECLARED_CONSTEXPR_P (decl
) = true;
6797 determine_visibility (decl
);
6798 layout_var_decl (decl
);
6799 maybe_commonize_var (decl
);
6800 make_rtl_for_nonlocal_decl (decl
, init
, /*asmspec=*/NULL
);
6803 /* INIT is the initializer for a variable, as represented by the
6804 parser. Returns true iff INIT is value-dependent. */
6807 value_dependent_init_p (tree init
)
6809 if (TREE_CODE (init
) == TREE_LIST
)
6810 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
6811 return any_value_dependent_elements_p (init
);
6812 else if (TREE_CODE (init
) == CONSTRUCTOR
)
6813 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
6815 if (dependent_type_p (TREE_TYPE (init
)))
6818 vec
<constructor_elt
, va_gc
> *elts
;
6822 elts
= CONSTRUCTOR_ELTS (init
);
6823 nelts
= vec_safe_length (elts
);
6824 for (i
= 0; i
< nelts
; ++i
)
6825 if (value_dependent_init_p ((*elts
)[i
].value
))
6829 /* It must be a simple expression, e.g., int i = 3; */
6830 return value_dependent_expression_p (init
);
6835 // Returns true if a DECL is VAR_DECL with the concept specifier.
6837 is_concept_var (tree decl
)
6839 return (VAR_P (decl
)
6840 // Not all variables have DECL_LANG_SPECIFIC.
6841 && DECL_LANG_SPECIFIC (decl
)
6842 && DECL_DECLARED_CONCEPT_P (decl
));
6845 /* A helper function to be called via walk_tree. If any label exists
6846 under *TP, it is (going to be) forced. Set has_forced_label_in_static. */
6849 notice_forced_label_r (tree
*tp
, int *walk_subtrees
, void *)
6853 if (TREE_CODE (*tp
) == LABEL_DECL
)
6854 cfun
->has_forced_label_in_static
= 1;
6858 /* Finish processing of a declaration;
6859 install its line number and initial value.
6860 If the length of an array type is not known before,
6861 it must be determined now, from the initial value, or it is an error.
6863 INIT is the initializer (if any) for DECL. If INIT_CONST_EXPR_P is
6864 true, then INIT is an integral constant expression.
6866 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
6867 if the (init) syntax was used. */
6870 cp_finish_decl (tree decl
, tree init
, bool init_const_expr_p
,
6871 tree asmspec_tree
, int flags
)
6874 vec
<tree
, va_gc
> *cleanups
= NULL
;
6875 const char *asmspec
= NULL
;
6876 int was_readonly
= 0;
6877 bool var_definition_p
= false;
6880 if (decl
== error_mark_node
)
6885 error ("assignment (not initialization) in declaration");
6889 gcc_assert (TREE_CODE (decl
) != RESULT_DECL
);
6890 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
6891 gcc_assert (TREE_CODE (decl
) != PARM_DECL
);
6893 type
= TREE_TYPE (decl
);
6894 if (type
== error_mark_node
)
6897 /* Warn about register storage specifiers except when in GNU global
6898 or local register variable extension. */
6899 if (VAR_P (decl
) && DECL_REGISTER (decl
) && asmspec_tree
== NULL_TREE
)
6901 if (cxx_dialect
>= cxx17
)
6902 pedwarn (DECL_SOURCE_LOCATION (decl
), OPT_Wregister
,
6903 "ISO C++17 does not allow %<register%> storage "
6906 warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wregister
,
6907 "%<register%> storage class specifier used");
6910 /* If a name was specified, get the string. */
6911 if (at_namespace_scope_p ())
6912 asmspec_tree
= maybe_apply_renaming_pragma (decl
, asmspec_tree
);
6913 if (asmspec_tree
&& asmspec_tree
!= error_mark_node
)
6914 asmspec
= TREE_STRING_POINTER (asmspec_tree
);
6916 if (current_class_type
6917 && CP_DECL_CONTEXT (decl
) == current_class_type
6918 && TYPE_BEING_DEFINED (current_class_type
)
6919 && !CLASSTYPE_TEMPLATE_INSTANTIATION (current_class_type
)
6920 && (DECL_INITIAL (decl
) || init
))
6921 DECL_INITIALIZED_IN_CLASS_P (decl
) = 1;
6923 /* Do auto deduction unless decl is a function or an uninstantiated
6924 template specialization. */
6925 if (TREE_CODE (decl
) != FUNCTION_DECL
6926 && !(init
== NULL_TREE
6927 && DECL_LANG_SPECIFIC (decl
)
6928 && DECL_TEMPLATE_INSTANTIATION (decl
)
6929 && !DECL_TEMPLATE_INSTANTIATED (decl
))
6930 && (auto_node
= type_uses_auto (type
)))
6933 if (init
== NULL_TREE
)
6934 gcc_assert (CLASS_PLACEHOLDER_TEMPLATE (auto_node
));
6938 if (TREE_CODE (d_init
) == TREE_LIST
6939 && !CLASS_PLACEHOLDER_TEMPLATE (auto_node
))
6940 d_init
= build_x_compound_expr_from_list (d_init
, ELK_INIT
,
6941 tf_warning_or_error
);
6942 d_init
= resolve_nondeduced_context (d_init
, tf_warning_or_error
);
6944 enum auto_deduction_context adc
= adc_variable_type
;
6945 if (VAR_P (decl
) && DECL_DECOMPOSITION_P (decl
))
6946 adc
= adc_decomp_type
;
6947 type
= TREE_TYPE (decl
) = do_auto_deduction (type
, d_init
, auto_node
,
6948 tf_warning_or_error
, adc
,
6950 if (type
== error_mark_node
)
6952 if (TREE_CODE (type
) == FUNCTION_TYPE
)
6954 error ("initializer for %<decltype(auto) %D%> has function type "
6955 "(did you forget the %<()%> ?)", decl
);
6956 TREE_TYPE (decl
) = error_mark_node
;
6959 cp_apply_type_quals_to_decl (cp_type_quals (type
), decl
);
6962 if (ensure_literal_type_for_constexpr_object (decl
) == error_mark_node
)
6964 DECL_DECLARED_CONSTEXPR_P (decl
) = 0;
6965 if (VAR_P (decl
) && DECL_CLASS_SCOPE_P (decl
))
6968 DECL_EXTERNAL (decl
) = 1;
6973 && DECL_CLASS_SCOPE_P (decl
)
6974 && DECL_INITIALIZED_IN_CLASS_P (decl
))
6975 check_static_variable_definition (decl
, type
);
6977 if (init
&& TREE_CODE (decl
) == FUNCTION_DECL
)
6980 if (init
== ridpointers
[(int)RID_DELETE
])
6982 /* FIXME check this is 1st decl. */
6983 DECL_DELETED_FN (decl
) = 1;
6984 DECL_DECLARED_INLINE_P (decl
) = 1;
6985 DECL_INITIAL (decl
) = error_mark_node
;
6986 FOR_EACH_CLONE (clone
, decl
)
6988 DECL_DELETED_FN (clone
) = 1;
6989 DECL_DECLARED_INLINE_P (clone
) = 1;
6990 DECL_INITIAL (clone
) = error_mark_node
;
6994 else if (init
== ridpointers
[(int)RID_DEFAULT
])
6996 if (defaultable_fn_check (decl
))
6997 DECL_DEFAULTED_FN (decl
) = 1;
6999 DECL_INITIAL (decl
) = NULL_TREE
;
7003 if (init
&& VAR_P (decl
))
7005 DECL_NONTRIVIALLY_INITIALIZED_P (decl
) = 1;
7006 /* If DECL is a reference, then we want to know whether init is a
7007 reference constant; init_const_expr_p as passed tells us whether
7008 it's an rvalue constant. */
7009 if (TYPE_REF_P (type
))
7010 init_const_expr_p
= potential_constant_expression (init
);
7011 if (init_const_expr_p
)
7013 /* Set these flags now for templates. We'll update the flags in
7014 store_init_value for instantiations. */
7015 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl
) = 1;
7016 if (decl_maybe_constant_var_p (decl
)
7017 /* FIXME setting TREE_CONSTANT on refs breaks the back end. */
7018 && !TYPE_REF_P (type
))
7019 TREE_CONSTANT (decl
) = 1;
7023 if (processing_template_decl
)
7025 bool type_dependent_p
;
7027 /* Add this declaration to the statement-tree. */
7028 if (at_function_scope_p ())
7029 add_decl_expr (decl
);
7031 type_dependent_p
= dependent_type_p (type
);
7033 if (check_for_bare_parameter_packs (init
))
7036 DECL_INITIAL (decl
) = NULL_TREE
;
7039 /* Generally, initializers in templates are expanded when the
7040 template is instantiated. But, if DECL is a variable constant
7041 then it can be used in future constant expressions, so its value
7042 must be available. */
7044 bool dep_init
= false;
7046 if (!VAR_P (decl
) || type_dependent_p
)
7047 /* We can't do anything if the decl has dependent type. */;
7048 else if (!init
&& is_concept_var (decl
))
7050 error ("variable concept has no initializer");
7051 init
= boolean_true_node
;
7054 && init_const_expr_p
7055 && !TYPE_REF_P (type
)
7056 && decl_maybe_constant_var_p (decl
)
7057 && !(dep_init
= value_dependent_init_p (init
)))
7059 /* This variable seems to be a non-dependent constant, so process
7060 its initializer. If check_initializer returns non-null the
7061 initialization wasn't constant after all. */
7063 cleanups
= make_tree_vector ();
7064 init_code
= check_initializer (decl
, init
, flags
, &cleanups
);
7065 if (init_code
== NULL_TREE
)
7067 release_tree_vector (cleanups
);
7071 gcc_assert (!DECL_PRETTY_FUNCTION_P (decl
));
7072 /* Deduce array size even if the initializer is dependent. */
7073 maybe_deduce_size_from_array_init (decl
, init
);
7074 /* And complain about multiple initializers. */
7075 if (init
&& TREE_CODE (init
) == TREE_LIST
&& TREE_CHAIN (init
)
7076 && !MAYBE_CLASS_TYPE_P (type
))
7077 init
= build_x_compound_expr_from_list (init
, ELK_INIT
,
7078 tf_warning_or_error
);
7082 DECL_INITIAL (decl
) = init
;
7086 retrofit_lang_decl (decl
);
7087 SET_DECL_DEPENDENT_INIT_P (decl
, true);
7092 /* Just store non-static data member initializers for later. */
7093 if (init
&& TREE_CODE (decl
) == FIELD_DECL
)
7094 DECL_INITIAL (decl
) = init
;
7096 /* Take care of TYPE_DECLs up front. */
7097 if (TREE_CODE (decl
) == TYPE_DECL
)
7099 if (type
!= error_mark_node
7100 && MAYBE_CLASS_TYPE_P (type
) && DECL_NAME (decl
))
7102 if (TREE_TYPE (DECL_NAME (decl
)) && TREE_TYPE (decl
) != type
)
7103 warning (0, "shadowing previous type declaration of %q#D", decl
);
7104 set_identifier_type_value (DECL_NAME (decl
), decl
);
7107 /* If we have installed this as the canonical typedef for this
7108 type, and that type has not been defined yet, delay emitting
7109 the debug information for it, as we will emit it later. */
7110 if (TYPE_MAIN_DECL (TREE_TYPE (decl
)) == decl
7111 && !COMPLETE_TYPE_P (TREE_TYPE (decl
)))
7112 TYPE_DECL_SUPPRESS_DEBUG (decl
) = 1;
7114 rest_of_decl_compilation (decl
, DECL_FILE_SCOPE_P (decl
),
7119 /* A reference will be modified here, as it is initialized. */
7120 if (! DECL_EXTERNAL (decl
)
7121 && TREE_READONLY (decl
)
7122 && TYPE_REF_P (type
))
7125 TREE_READONLY (decl
) = 0;
7130 /* If this is a local variable that will need a mangled name,
7131 register it now. We must do this before processing the
7132 initializer for the variable, since the initialization might
7133 require a guard variable, and since the mangled name of the
7134 guard variable will depend on the mangled name of this
7136 if (DECL_FUNCTION_SCOPE_P (decl
)
7137 && TREE_STATIC (decl
)
7138 && !DECL_ARTIFICIAL (decl
))
7140 /* The variable holding an anonymous union will have had its
7141 discriminator set in finish_anon_union, after which it's
7142 NAME will have been cleared. */
7143 if (DECL_NAME (decl
))
7144 determine_local_discriminator (decl
);
7145 /* Normally has_forced_label_in_static is set during GIMPLE
7146 lowering, but [cd]tors are never actually compiled directly.
7147 We need to set this early so we can deal with the label
7148 address extension. */
7149 if ((DECL_CONSTRUCTOR_P (current_function_decl
)
7150 || DECL_DESTRUCTOR_P (current_function_decl
))
7153 walk_tree (&init
, notice_forced_label_r
, NULL
, NULL
);
7154 add_local_decl (cfun
, decl
);
7156 /* And make sure it's in the symbol table for
7157 c_parse_final_cleanups to find. */
7158 varpool_node::get_create (decl
);
7161 /* Convert the initializer to the type of DECL, if we have not
7162 already initialized DECL. */
7163 if (!DECL_INITIALIZED_P (decl
)
7164 /* If !DECL_EXTERNAL then DECL is being defined. In the
7165 case of a static data member initialized inside the
7166 class-specifier, there can be an initializer even if DECL
7167 is *not* defined. */
7168 && (!DECL_EXTERNAL (decl
) || init
))
7170 cleanups
= make_tree_vector ();
7171 init
= check_initializer (decl
, init
, flags
, &cleanups
);
7177 The memory occupied by any object of static storage
7178 duration is zero-initialized at program startup before
7179 any other initialization takes place.
7181 We cannot create an appropriate initializer until after
7182 the type of DECL is finalized. If DECL_INITIAL is set,
7183 then the DECL is statically initialized, and any
7184 necessary zero-initialization has already been performed. */
7185 if (TREE_STATIC (decl
) && !DECL_INITIAL (decl
))
7186 DECL_INITIAL (decl
) = build_zero_init (TREE_TYPE (decl
),
7187 /*nelts=*/NULL_TREE
,
7188 /*static_storage_p=*/true);
7189 /* Remember that the initialization for this variable has
7191 DECL_INITIALIZED_P (decl
) = 1;
7192 /* This declaration is the definition of this variable,
7193 unless we are initializing a static data member within
7194 the class specifier. */
7195 if (!DECL_EXTERNAL (decl
))
7196 var_definition_p
= true;
7198 /* If the variable has an array type, lay out the type, even if
7199 there is no initializer. It is valid to index through the
7200 array, and we must get TYPE_ALIGN set correctly on the array
7202 else if (TREE_CODE (type
) == ARRAY_TYPE
)
7205 if (TREE_STATIC (decl
)
7206 && !at_function_scope_p ()
7207 && current_function_decl
== NULL
)
7208 /* So decl is a global variable or a static member of a
7209 non local class. Record the types it uses
7210 so that we can decide later to emit debug info for them. */
7211 record_types_used_by_current_var_decl (decl
);
7214 /* Add this declaration to the statement-tree. This needs to happen
7215 after the call to check_initializer so that the DECL_EXPR for a
7216 reference temp is added before the DECL_EXPR for the reference itself. */
7217 if (DECL_FUNCTION_SCOPE_P (decl
))
7219 /* If we're building a variable sized type, and we might be
7220 reachable other than via the top of the current binding
7221 level, then create a new BIND_EXPR so that we deallocate
7222 the object at the right time. */
7225 && !TREE_CONSTANT (DECL_SIZE (decl
))
7226 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list
))
7229 bind
= build3 (BIND_EXPR
, void_type_node
, NULL
, NULL
, NULL
);
7230 TREE_SIDE_EFFECTS (bind
) = 1;
7232 BIND_EXPR_BODY (bind
) = push_stmt_list ();
7234 add_decl_expr (decl
);
7237 /* Let the middle end know about variables and functions -- but not
7238 static data members in uninstantiated class templates. */
7239 if (VAR_OR_FUNCTION_DECL_P (decl
))
7243 layout_var_decl (decl
);
7244 maybe_commonize_var (decl
);
7247 /* This needs to happen after the linkage is set. */
7248 determine_visibility (decl
);
7250 if (var_definition_p
&& TREE_STATIC (decl
))
7252 /* If a TREE_READONLY variable needs initialization
7253 at runtime, it is no longer readonly and we need to
7254 avoid MEM_READONLY_P being set on RTL created for it. */
7257 if (TREE_READONLY (decl
))
7258 TREE_READONLY (decl
) = 0;
7261 else if (was_readonly
)
7262 TREE_READONLY (decl
) = 1;
7264 /* Likewise if it needs destruction. */
7265 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type
))
7266 TREE_READONLY (decl
) = 0;
7269 make_rtl_for_nonlocal_decl (decl
, init
, asmspec
);
7271 /* Check for abstractness of the type. Notice that there is no
7272 need to strip array types here since the check for those types
7273 is already done within create_array_type_for_decl. */
7274 abstract_virtuals_error (decl
, type
);
7276 if (TREE_TYPE (decl
) == error_mark_node
)
7277 /* No initialization required. */
7279 else if (TREE_CODE (decl
) == FUNCTION_DECL
)
7283 if (init
== ridpointers
[(int)RID_DEFAULT
])
7285 /* An out-of-class default definition is defined at
7286 the point where it is explicitly defaulted. */
7287 if (DECL_DELETED_FN (decl
))
7288 maybe_explain_implicit_delete (decl
);
7289 else if (DECL_INITIAL (decl
) == error_mark_node
)
7290 synthesize_method (decl
);
7293 error ("function %q#D is initialized like a variable", decl
);
7295 /* else no initialization required. */
7297 else if (DECL_EXTERNAL (decl
)
7298 && ! (DECL_LANG_SPECIFIC (decl
)
7299 && DECL_NOT_REALLY_EXTERN (decl
)))
7302 DECL_INITIAL (decl
) = init
;
7304 /* A variable definition. */
7305 else if (DECL_FUNCTION_SCOPE_P (decl
) && !TREE_STATIC (decl
))
7306 /* Initialize the local variable. */
7307 initialize_local_var (decl
, init
);
7309 /* If a variable is defined, and then a subsequent
7310 definition with external linkage is encountered, we will
7311 get here twice for the same variable. We want to avoid
7312 calling expand_static_init more than once. For variables
7313 that are not static data members, we can call
7314 expand_static_init only when we actually process the
7315 initializer. It is not legal to redeclare a static data
7316 member, so this issue does not arise in that case. */
7317 else if (var_definition_p
&& TREE_STATIC (decl
))
7318 expand_static_init (decl
, init
);
7321 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
7322 reference, insert it in the statement-tree now. */
7326 FOR_EACH_VEC_ELT (*cleanups
, i
, t
)
7327 push_cleanup (decl
, t
, false);
7328 release_tree_vector (cleanups
);
7332 TREE_READONLY (decl
) = 1;
7336 && lookup_attribute ("omp declare target implicit",
7337 DECL_ATTRIBUTES (decl
)))
7339 DECL_ATTRIBUTES (decl
)
7340 = remove_attribute ("omp declare target implicit",
7341 DECL_ATTRIBUTES (decl
));
7342 complete_type (TREE_TYPE (decl
));
7343 if (!cp_omp_mappable_type (TREE_TYPE (decl
)))
7344 error ("%q+D in declare target directive does not have mappable type",
7346 else if (!lookup_attribute ("omp declare target",
7347 DECL_ATTRIBUTES (decl
))
7348 && !lookup_attribute ("omp declare target link",
7349 DECL_ATTRIBUTES (decl
)))
7350 DECL_ATTRIBUTES (decl
)
7351 = tree_cons (get_identifier ("omp declare target"),
7352 NULL_TREE
, DECL_ATTRIBUTES (decl
));
7355 invoke_plugin_callbacks (PLUGIN_FINISH_DECL
, decl
);
7358 /* For class TYPE return itself or some its bases that contain
7359 any direct non-static data members. Return error_mark_node if an
7360 error has been diagnosed. */
7363 find_decomp_class_base (location_t loc
, tree type
, tree ret
)
7365 bool member_seen
= false;
7366 for (tree field
= TYPE_FIELDS (type
); field
; field
= DECL_CHAIN (field
))
7367 if (TREE_CODE (field
) != FIELD_DECL
7368 || DECL_ARTIFICIAL (field
)
7369 || DECL_UNNAMED_BIT_FIELD (field
))
7373 else if (ANON_AGGR_TYPE_P (TREE_TYPE (field
)))
7375 if (TREE_CODE (TREE_TYPE (field
)) == RECORD_TYPE
)
7376 error_at (loc
, "cannot decompose class type %qT because it has an "
7377 "anonymous struct member", type
);
7379 error_at (loc
, "cannot decompose class type %qT because it has an "
7380 "anonymous union member", type
);
7381 inform (DECL_SOURCE_LOCATION (field
), "declared here");
7382 return error_mark_node
;
7384 else if (!accessible_p (type
, field
, true))
7386 error_at (loc
, "cannot decompose inaccessible member %qD of %qT",
7388 inform (DECL_SOURCE_LOCATION (field
),
7389 TREE_PRIVATE (field
)
7390 ? G_("declared private here")
7391 : G_("declared protected here"));
7392 return error_mark_node
;
7397 tree base_binfo
, binfo
;
7398 tree orig_ret
= ret
;
7402 for (binfo
= TYPE_BINFO (type
), i
= 0;
7403 BINFO_BASE_ITERATE (binfo
, i
, base_binfo
); i
++)
7405 tree t
= find_decomp_class_base (loc
, TREE_TYPE (base_binfo
), ret
);
7406 if (t
== error_mark_node
)
7407 return error_mark_node
;
7408 if (t
!= NULL_TREE
&& t
!= ret
)
7412 error_at (loc
, "cannot decompose class type %qT: both it and "
7413 "its base class %qT have non-static data members",
7415 return error_mark_node
;
7417 else if (orig_ret
!= NULL_TREE
)
7419 else if (ret
!= NULL_TREE
)
7421 error_at (loc
, "cannot decompose class type %qT: its base "
7422 "classes %qT and %qT have non-static data "
7423 "members", type
, ret
, t
);
7424 return error_mark_node
;
7433 /* Return std::tuple_size<TYPE>::value. */
7436 get_tuple_size (tree type
)
7438 tree args
= make_tree_vec (1);
7439 TREE_VEC_ELT (args
, 0) = type
;
7440 tree inst
= lookup_template_class (tuple_size_identifier
, args
,
7441 /*in_decl*/NULL_TREE
,
7442 /*context*/std_node
,
7443 /*entering_scope*/false, tf_none
);
7444 inst
= complete_type (inst
);
7445 if (inst
== error_mark_node
|| !COMPLETE_TYPE_P (inst
))
7447 tree val
= lookup_qualified_name (inst
, value_identifier
,
7448 /*type*/false, /*complain*/false);
7449 if (TREE_CODE (val
) == VAR_DECL
|| TREE_CODE (val
) == CONST_DECL
)
7450 val
= maybe_constant_value (val
);
7451 if (TREE_CODE (val
) == INTEGER_CST
)
7454 return error_mark_node
;
7457 /* Return std::tuple_element<I,TYPE>::type. */
7460 get_tuple_element_type (tree type
, unsigned i
)
7462 tree args
= make_tree_vec (2);
7463 TREE_VEC_ELT (args
, 0) = build_int_cst (integer_type_node
, i
);
7464 TREE_VEC_ELT (args
, 1) = type
;
7465 tree inst
= lookup_template_class (tuple_element_identifier
, args
,
7466 /*in_decl*/NULL_TREE
,
7467 /*context*/std_node
,
7468 /*entering_scope*/false,
7469 tf_warning_or_error
);
7470 return make_typename_type (inst
, type_identifier
,
7471 none_type
, tf_warning_or_error
);
7474 /* Return e.get<i>() or get<i>(e). */
7477 get_tuple_decomp_init (tree decl
, unsigned i
)
7479 tree targs
= make_tree_vec (1);
7480 TREE_VEC_ELT (targs
, 0) = build_int_cst (integer_type_node
, i
);
7482 tree etype
= TREE_TYPE (decl
);
7483 tree e
= convert_from_reference (decl
);
7485 /* [The id-expression] e is an lvalue if the type of the entity e is an
7486 lvalue reference and an xvalue otherwise. */
7487 if (!TYPE_REF_P (etype
)
7488 || TYPE_REF_IS_RVALUE (etype
))
7491 tree fns
= lookup_qualified_name (TREE_TYPE (e
), get__identifier
,
7492 /*type*/false, /*complain*/false);
7493 bool use_member_get
= false;
7495 /* To use a member get, member lookup must find at least one
7496 declaration that is a function template
7497 whose first template parameter is a non-type parameter. */
7498 for (lkp_iterator
iter (MAYBE_BASELINK_FUNCTIONS (fns
)); iter
; ++iter
)
7501 if (TREE_CODE (fn
) == TEMPLATE_DECL
)
7503 tree tparms
= DECL_TEMPLATE_PARMS (fn
);
7504 tree parm
= TREE_VEC_ELT (INNERMOST_TEMPLATE_PARMS (tparms
), 0);
7505 if (TREE_CODE (TREE_VALUE (parm
)) == PARM_DECL
)
7507 use_member_get
= true;
7515 fns
= lookup_template_function (fns
, targs
);
7516 return build_new_method_call (e
, fns
, /*args*/NULL
,
7517 /*path*/NULL_TREE
, LOOKUP_NORMAL
,
7518 /*fn_p*/NULL
, tf_warning_or_error
);
7522 vec
<tree
,va_gc
> *args
= make_tree_vector_single (e
);
7523 fns
= lookup_template_function (get__identifier
, targs
);
7524 fns
= perform_koenig_lookup (fns
, args
, tf_warning_or_error
);
7525 return finish_call_expr (fns
, &args
, /*novirt*/false,
7526 /*koenig*/true, tf_warning_or_error
);
7530 /* It's impossible to recover the decltype of a tuple decomposition variable
7531 based on the actual type of the variable, so store it in a hash table. */
7533 static GTY((cache
)) tree_cache_map
*decomp_type_table
;
7535 store_decomp_type (tree v
, tree t
)
7537 if (!decomp_type_table
)
7538 decomp_type_table
= tree_cache_map::create_ggc (13);
7539 decomp_type_table
->put (v
, t
);
7543 lookup_decomp_type (tree v
)
7545 return *decomp_type_table
->get (v
);
7548 /* Mangle a decomposition declaration if needed. Arguments like
7549 in cp_finish_decomp. */
7552 cp_maybe_mangle_decomp (tree decl
, tree first
, unsigned int count
)
7554 if (!processing_template_decl
7555 && !error_operand_p (decl
)
7556 && DECL_NAMESPACE_SCOPE_P (decl
))
7558 auto_vec
<tree
, 16> v
;
7559 v
.safe_grow (count
);
7561 for (unsigned int i
= 0; i
< count
; i
++, d
= DECL_CHAIN (d
))
7562 v
[count
- i
- 1] = d
;
7563 SET_DECL_ASSEMBLER_NAME (decl
, mangle_decomp (decl
, v
));
7564 maybe_apply_pragma_weak (decl
);
7568 /* Finish a decomposition declaration. DECL is the underlying declaration
7569 "e", FIRST is the head of a chain of decls for the individual identifiers
7570 chained through DECL_CHAIN in reverse order and COUNT is the number of
7574 cp_finish_decomp (tree decl
, tree first
, unsigned int count
)
7576 if (error_operand_p (decl
))
7581 TREE_TYPE (first
) = error_mark_node
;
7582 if (DECL_HAS_VALUE_EXPR_P (first
))
7584 SET_DECL_VALUE_EXPR (first
, NULL_TREE
);
7585 DECL_HAS_VALUE_EXPR_P (first
) = 0;
7587 first
= DECL_CHAIN (first
);
7589 if (DECL_P (decl
) && DECL_NAMESPACE_SCOPE_P (decl
))
7590 SET_DECL_ASSEMBLER_NAME (decl
, get_identifier ("<decomp>"));
7594 location_t loc
= DECL_SOURCE_LOCATION (decl
);
7595 if (type_dependent_expression_p (decl
)
7596 /* This happens for range for when not in templates.
7597 Still add the DECL_VALUE_EXPRs for later processing. */
7598 || (!processing_template_decl
7599 && type_uses_auto (TREE_TYPE (decl
))))
7601 for (unsigned int i
= 0; i
< count
; i
++)
7603 if (!DECL_HAS_VALUE_EXPR_P (first
))
7605 tree v
= build_nt (ARRAY_REF
, decl
,
7606 size_int (count
- i
- 1),
7607 NULL_TREE
, NULL_TREE
);
7608 SET_DECL_VALUE_EXPR (first
, v
);
7609 DECL_HAS_VALUE_EXPR_P (first
) = 1;
7611 if (processing_template_decl
)
7612 fit_decomposition_lang_decl (first
, decl
);
7613 first
= DECL_CHAIN (first
);
7618 auto_vec
<tree
, 16> v
;
7619 v
.safe_grow (count
);
7621 for (unsigned int i
= 0; i
< count
; i
++, d
= DECL_CHAIN (d
))
7623 v
[count
- i
- 1] = d
;
7624 fit_decomposition_lang_decl (d
, decl
);
7627 tree type
= TREE_TYPE (decl
);
7630 if (TYPE_REF_P (type
))
7632 dexp
= convert_from_reference (dexp
);
7633 type
= complete_type (TREE_TYPE (type
));
7634 if (type
== error_mark_node
)
7636 if (!COMPLETE_TYPE_P (type
))
7638 error_at (loc
, "structured binding refers to incomplete type %qT",
7644 tree eltype
= NULL_TREE
;
7645 unsigned HOST_WIDE_INT eltscnt
= 0;
7646 if (TREE_CODE (type
) == ARRAY_TYPE
)
7649 nelts
= array_type_nelts_top (type
);
7650 if (nelts
== error_mark_node
)
7652 if (!tree_fits_uhwi_p (nelts
))
7654 error_at (loc
, "cannot decompose variable length array %qT", type
);
7657 eltscnt
= tree_to_uhwi (nelts
);
7658 if (count
!= eltscnt
)
7661 if (count
> eltscnt
)
7662 error_n (loc
, count
,
7663 "%u name provided for structured binding",
7664 "%u names provided for structured binding", count
);
7666 error_n (loc
, count
,
7667 "only %u name provided for structured binding",
7668 "only %u names provided for structured binding", count
);
7669 inform_n (loc
, eltscnt
,
7670 "while %qT decomposes into %wu element",
7671 "while %qT decomposes into %wu elements",
7675 eltype
= TREE_TYPE (type
);
7676 for (unsigned int i
= 0; i
< count
; i
++)
7678 TREE_TYPE (v
[i
]) = eltype
;
7679 layout_decl (v
[i
], 0);
7680 if (processing_template_decl
)
7682 tree t
= unshare_expr (dexp
);
7683 t
= build4_loc (DECL_SOURCE_LOCATION (v
[i
]), ARRAY_REF
,
7684 eltype
, t
, size_int (i
), NULL_TREE
,
7686 SET_DECL_VALUE_EXPR (v
[i
], t
);
7687 DECL_HAS_VALUE_EXPR_P (v
[i
]) = 1;
7690 /* 2 GNU extensions. */
7691 else if (TREE_CODE (type
) == COMPLEX_TYPE
)
7694 if (count
!= eltscnt
)
7696 eltype
= cp_build_qualified_type (TREE_TYPE (type
), TYPE_QUALS (type
));
7697 for (unsigned int i
= 0; i
< count
; i
++)
7699 TREE_TYPE (v
[i
]) = eltype
;
7700 layout_decl (v
[i
], 0);
7701 if (processing_template_decl
)
7703 tree t
= unshare_expr (dexp
);
7704 t
= build1_loc (DECL_SOURCE_LOCATION (v
[i
]),
7705 i
? IMAGPART_EXPR
: REALPART_EXPR
, eltype
,
7707 SET_DECL_VALUE_EXPR (v
[i
], t
);
7708 DECL_HAS_VALUE_EXPR_P (v
[i
]) = 1;
7711 else if (TREE_CODE (type
) == VECTOR_TYPE
)
7713 if (!TYPE_VECTOR_SUBPARTS (type
).is_constant (&eltscnt
))
7715 error_at (loc
, "cannot decompose variable length vector %qT", type
);
7718 if (count
!= eltscnt
)
7720 eltype
= cp_build_qualified_type (TREE_TYPE (type
), TYPE_QUALS (type
));
7721 for (unsigned int i
= 0; i
< count
; i
++)
7723 TREE_TYPE (v
[i
]) = eltype
;
7724 layout_decl (v
[i
], 0);
7725 if (processing_template_decl
)
7727 tree t
= unshare_expr (dexp
);
7728 convert_vector_to_array_for_subscript (DECL_SOURCE_LOCATION (v
[i
]),
7730 t
= build4_loc (DECL_SOURCE_LOCATION (v
[i
]), ARRAY_REF
,
7731 eltype
, t
, size_int (i
), NULL_TREE
,
7733 SET_DECL_VALUE_EXPR (v
[i
], t
);
7734 DECL_HAS_VALUE_EXPR_P (v
[i
]) = 1;
7737 else if (tree tsize
= get_tuple_size (type
))
7739 if (tsize
== error_mark_node
)
7741 error_at (loc
, "%<std::tuple_size<%T>::value%> is not an integral "
7742 "constant expression", type
);
7745 if (!tree_fits_uhwi_p (tsize
))
7747 error_n (loc
, count
,
7748 "%u name provided for structured binding",
7749 "%u names provided for structured binding", count
);
7750 inform (loc
, "while %qT decomposes into %E elements",
7754 eltscnt
= tree_to_uhwi (tsize
);
7755 if (count
!= eltscnt
)
7757 int save_read
= DECL_READ_P (decl
);
7758 for (unsigned i
= 0; i
< count
; ++i
)
7760 location_t sloc
= input_location
;
7761 location_t dloc
= DECL_SOURCE_LOCATION (v
[i
]);
7763 input_location
= dloc
;
7764 tree init
= get_tuple_decomp_init (decl
, i
);
7765 tree eltype
= (init
== error_mark_node
? error_mark_node
7766 : get_tuple_element_type (type
, i
));
7767 input_location
= sloc
;
7769 if (init
== error_mark_node
|| eltype
== error_mark_node
)
7771 inform (dloc
, "in initialization of structured binding "
7772 "variable %qD", v
[i
]);
7775 /* Save the decltype away before reference collapse. */
7776 store_decomp_type (v
[i
], eltype
);
7777 eltype
= cp_build_reference_type (eltype
, !lvalue_p (init
));
7778 TREE_TYPE (v
[i
]) = eltype
;
7779 layout_decl (v
[i
], 0);
7780 if (DECL_HAS_VALUE_EXPR_P (v
[i
]))
7782 /* In this case the names are variables, not just proxies. */
7783 SET_DECL_VALUE_EXPR (v
[i
], NULL_TREE
);
7784 DECL_HAS_VALUE_EXPR_P (v
[i
]) = 0;
7786 if (!processing_template_decl
)
7787 cp_finish_decl (v
[i
], init
, /*constexpr*/false,
7788 /*asm*/NULL_TREE
, LOOKUP_NORMAL
);
7790 /* Ignore reads from the underlying decl performed during initialization
7791 of the individual variables. If those will be read, we'll mark
7792 the underlying decl as read at that point. */
7793 DECL_READ_P (decl
) = save_read
;
7795 else if (TREE_CODE (type
) == UNION_TYPE
)
7797 error_at (loc
, "cannot decompose union type %qT", type
);
7800 else if (!CLASS_TYPE_P (type
))
7802 error_at (loc
, "cannot decompose non-array non-class type %qT", type
);
7805 else if (LAMBDA_TYPE_P (type
))
7807 error_at (loc
, "cannot decompose lambda closure type %qT", type
);
7810 else if (processing_template_decl
&& !COMPLETE_TYPE_P (type
))
7811 pedwarn (loc
, 0, "structured binding refers to incomplete class type %qT",
7815 tree btype
= find_decomp_class_base (loc
, type
, NULL_TREE
);
7816 if (btype
== error_mark_node
)
7818 else if (btype
== NULL_TREE
)
7820 error_at (loc
, "cannot decompose class type %qT without non-static "
7821 "data members", type
);
7824 for (tree field
= TYPE_FIELDS (btype
); field
; field
= TREE_CHAIN (field
))
7825 if (TREE_CODE (field
) != FIELD_DECL
7826 || DECL_ARTIFICIAL (field
)
7827 || DECL_UNNAMED_BIT_FIELD (field
))
7831 if (count
!= eltscnt
)
7836 t
= convert_to_base (t
, btype
, /*check_access*/true,
7837 /*nonnull*/false, tf_warning_or_error
);
7841 for (tree field
= TYPE_FIELDS (btype
); field
; field
= TREE_CHAIN (field
))
7842 if (TREE_CODE (field
) != FIELD_DECL
7843 || DECL_ARTIFICIAL (field
)
7844 || DECL_UNNAMED_BIT_FIELD (field
))
7848 tree tt
= finish_non_static_data_member (field
, unshare_expr (t
),
7850 if (REFERENCE_REF_P (tt
))
7851 tt
= TREE_OPERAND (tt
, 0);
7852 TREE_TYPE (v
[i
]) = TREE_TYPE (tt
);
7853 layout_decl (v
[i
], 0);
7854 if (!processing_template_decl
)
7856 SET_DECL_VALUE_EXPR (v
[i
], tt
);
7857 DECL_HAS_VALUE_EXPR_P (v
[i
]) = 1;
7862 if (processing_template_decl
)
7864 for (unsigned int i
= 0; i
< count
; i
++)
7865 if (!DECL_HAS_VALUE_EXPR_P (v
[i
]))
7867 tree a
= build_nt (ARRAY_REF
, decl
, size_int (i
),
7868 NULL_TREE
, NULL_TREE
);
7869 SET_DECL_VALUE_EXPR (v
[i
], a
);
7870 DECL_HAS_VALUE_EXPR_P (v
[i
]) = 1;
7875 /* Returns a declaration for a VAR_DECL as if:
7877 extern "C" TYPE NAME;
7879 had been seen. Used to create compiler-generated global
7883 declare_global_var (tree name
, tree type
)
7887 push_to_top_level ();
7888 decl
= build_decl (input_location
, VAR_DECL
, name
, type
);
7889 TREE_PUBLIC (decl
) = 1;
7890 DECL_EXTERNAL (decl
) = 1;
7891 DECL_ARTIFICIAL (decl
) = 1;
7892 DECL_CONTEXT (decl
) = FROB_CONTEXT (global_namespace
);
7893 /* If the user has explicitly declared this variable (perhaps
7894 because the code we are compiling is part of a low-level runtime
7895 library), then it is possible that our declaration will be merged
7896 with theirs by pushdecl. */
7897 decl
= pushdecl (decl
);
7898 cp_finish_decl (decl
, NULL_TREE
, false, NULL_TREE
, 0);
7899 pop_from_top_level ();
7904 /* Returns the type for the argument to "__cxa_atexit" (or "atexit",
7905 if "__cxa_atexit" is not being used) corresponding to the function
7906 to be called when the program exits. */
7909 get_atexit_fn_ptr_type (void)
7913 if (!atexit_fn_ptr_type_node
)
7916 if (flag_use_cxa_atexit
7917 && !targetm
.cxx
.use_atexit_for_cxa_atexit ())
7918 /* The parameter to "__cxa_atexit" is "void (*)(void *)". */
7919 arg_type
= ptr_type_node
;
7921 /* The parameter to "atexit" is "void (*)(void)". */
7922 arg_type
= NULL_TREE
;
7924 fn_type
= build_function_type_list (void_type_node
,
7925 arg_type
, NULL_TREE
);
7926 atexit_fn_ptr_type_node
= build_pointer_type (fn_type
);
7929 return atexit_fn_ptr_type_node
;
7932 /* Returns a pointer to the `atexit' function. Note that if
7933 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
7934 `__cxa_atexit' function specified in the IA64 C++ ABI. */
7937 get_atexit_node (void)
7943 bool use_aeabi_atexit
;
7948 if (flag_use_cxa_atexit
&& !targetm
.cxx
.use_atexit_for_cxa_atexit ())
7950 /* The declaration for `__cxa_atexit' is:
7952 int __cxa_atexit (void (*)(void *), void *, void *)
7954 We build up the argument types and then the function type
7956 tree argtype0
, argtype1
, argtype2
;
7958 use_aeabi_atexit
= targetm
.cxx
.use_aeabi_atexit ();
7959 /* First, build the pointer-to-function type for the first
7961 fn_ptr_type
= get_atexit_fn_ptr_type ();
7962 /* Then, build the rest of the argument types. */
7963 argtype2
= ptr_type_node
;
7964 if (use_aeabi_atexit
)
7966 argtype1
= fn_ptr_type
;
7967 argtype0
= ptr_type_node
;
7971 argtype1
= ptr_type_node
;
7972 argtype0
= fn_ptr_type
;
7974 /* And the final __cxa_atexit type. */
7975 fn_type
= build_function_type_list (integer_type_node
,
7976 argtype0
, argtype1
, argtype2
,
7978 if (use_aeabi_atexit
)
7979 name
= "__aeabi_atexit";
7981 name
= "__cxa_atexit";
7985 /* The declaration for `atexit' is:
7987 int atexit (void (*)());
7989 We build up the argument types and then the function type
7991 fn_ptr_type
= get_atexit_fn_ptr_type ();
7992 /* Build the final atexit type. */
7993 fn_type
= build_function_type_list (integer_type_node
,
7994 fn_ptr_type
, NULL_TREE
);
7998 /* Now, build the function declaration. */
7999 push_lang_context (lang_name_c
);
8000 atexit_fndecl
= build_library_fn_ptr (name
, fn_type
, ECF_LEAF
| ECF_NOTHROW
);
8001 mark_used (atexit_fndecl
);
8002 pop_lang_context ();
8003 atexit_node
= decay_conversion (atexit_fndecl
, tf_warning_or_error
);
8008 /* Like get_atexit_node, but for thread-local cleanups. */
8011 get_thread_atexit_node (void)
8013 /* The declaration for `__cxa_thread_atexit' is:
8015 int __cxa_thread_atexit (void (*)(void *), void *, void *) */
8016 tree fn_type
= build_function_type_list (integer_type_node
,
8017 get_atexit_fn_ptr_type (),
8018 ptr_type_node
, ptr_type_node
,
8021 /* Now, build the function declaration. */
8022 tree atexit_fndecl
= build_library_fn_ptr ("__cxa_thread_atexit", fn_type
,
8023 ECF_LEAF
| ECF_NOTHROW
);
8024 return decay_conversion (atexit_fndecl
, tf_warning_or_error
);
8027 /* Returns the __dso_handle VAR_DECL. */
8030 get_dso_handle_node (void)
8032 if (dso_handle_node
)
8033 return dso_handle_node
;
8035 /* Declare the variable. */
8036 dso_handle_node
= declare_global_var (get_identifier ("__dso_handle"),
8039 #ifdef HAVE_GAS_HIDDEN
8040 if (dso_handle_node
!= error_mark_node
)
8042 DECL_VISIBILITY (dso_handle_node
) = VISIBILITY_HIDDEN
;
8043 DECL_VISIBILITY_SPECIFIED (dso_handle_node
) = 1;
8047 return dso_handle_node
;
8050 /* Begin a new function with internal linkage whose job will be simply
8051 to destroy some particular variable. */
8053 static GTY(()) int start_cleanup_cnt
;
8056 start_cleanup_fn (void)
8061 bool use_cxa_atexit
= flag_use_cxa_atexit
8062 && !targetm
.cxx
.use_atexit_for_cxa_atexit ();
8064 push_to_top_level ();
8066 /* No need to mangle this. */
8067 push_lang_context (lang_name_c
);
8069 /* Build the name of the function. */
8070 sprintf (name
, "__tcf_%d", start_cleanup_cnt
++);
8071 /* Build the function declaration. */
8072 fntype
= TREE_TYPE (get_atexit_fn_ptr_type ());
8073 fndecl
= build_lang_decl (FUNCTION_DECL
, get_identifier (name
), fntype
);
8074 /* It's a function with internal linkage, generated by the
8076 TREE_PUBLIC (fndecl
) = 0;
8077 DECL_ARTIFICIAL (fndecl
) = 1;
8078 /* Make the function `inline' so that it is only emitted if it is
8079 actually needed. It is unlikely that it will be inlined, since
8080 it is only called via a function pointer, but we avoid unnecessary
8081 emissions this way. */
8082 DECL_DECLARED_INLINE_P (fndecl
) = 1;
8083 DECL_INTERFACE_KNOWN (fndecl
) = 1;
8084 /* Build the parameter. */
8087 tree parmdecl
= cp_build_parm_decl (fndecl
, NULL_TREE
, ptr_type_node
);
8088 TREE_USED (parmdecl
) = 1;
8089 DECL_READ_P (parmdecl
) = 1;
8090 DECL_ARGUMENTS (fndecl
) = parmdecl
;
8094 start_preparsed_function (fndecl
, NULL_TREE
, SF_PRE_PARSED
);
8096 pop_lang_context ();
8098 return current_function_decl
;
8101 /* Finish the cleanup function begun by start_cleanup_fn. */
8104 end_cleanup_fn (void)
8106 expand_or_defer_fn (finish_function (/*inline_p=*/false));
8108 pop_from_top_level ();
8111 /* Generate code to handle the destruction of DECL, an object with
8112 static storage duration. */
8115 register_dtor_fn (tree decl
)
8122 bool ob_parm
, dso_parm
, use_dtor
;
8123 tree arg0
, arg1
, arg2
;
8126 type
= TREE_TYPE (decl
);
8127 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type
))
8130 /* If we're using "__cxa_atexit" (or "__cxa_thread_atexit" or
8131 "__aeabi_atexit"), and DECL is a class object, we can just pass the
8132 destructor to "__cxa_atexit"; we don't have to build a temporary
8133 function to do the cleanup. */
8134 dso_parm
= (flag_use_cxa_atexit
8135 && !targetm
.cxx
.use_atexit_for_cxa_atexit ());
8136 ob_parm
= (CP_DECL_THREAD_LOCAL_P (decl
) || dso_parm
);
8137 use_dtor
= ob_parm
&& CLASS_TYPE_P (type
);
8140 cleanup
= get_class_binding (type
, complete_dtor_identifier
);
8142 /* Make sure it is accessible. */
8143 perform_or_defer_access_check (TYPE_BINFO (type
), cleanup
, cleanup
,
8144 tf_warning_or_error
);
8148 /* Call build_cleanup before we enter the anonymous function so
8149 that any access checks will be done relative to the current
8150 scope, rather than the scope of the anonymous function. */
8151 build_cleanup (decl
);
8153 /* Now start the function. */
8154 cleanup
= start_cleanup_fn ();
8156 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
8157 to the original function, rather than the anonymous one. That
8158 will make the back end think that nested functions are in use,
8159 which causes confusion. */
8160 push_deferring_access_checks (dk_no_check
);
8161 fcall
= build_cleanup (decl
);
8162 pop_deferring_access_checks ();
8164 /* Create the body of the anonymous function. */
8165 compound_stmt
= begin_compound_stmt (BCS_FN_BODY
);
8166 finish_expr_stmt (fcall
);
8167 finish_compound_stmt (compound_stmt
);
8171 /* Call atexit with the cleanup function. */
8172 mark_used (cleanup
);
8173 cleanup
= build_address (cleanup
);
8175 if (CP_DECL_THREAD_LOCAL_P (decl
))
8176 atex_node
= get_thread_atexit_node ();
8178 atex_node
= get_atexit_node ();
8182 /* We must convert CLEANUP to the type that "__cxa_atexit"
8184 cleanup
= build_nop (get_atexit_fn_ptr_type (), cleanup
);
8185 /* "__cxa_atexit" will pass the address of DECL to the
8186 cleanup function. */
8188 addr
= build_address (decl
);
8189 /* The declared type of the parameter to "__cxa_atexit" is
8190 "void *". For plain "T*", we could just let the
8191 machinery in cp_build_function_call convert it -- but if the
8192 type is "cv-qualified T *", then we need to convert it
8193 before passing it in, to avoid spurious errors. */
8194 addr
= build_nop (ptr_type_node
, addr
);
8197 /* Since the cleanup functions we build ignore the address
8198 they're given, there's no reason to pass the actual address
8199 in, and, in general, it's cheaper to pass NULL than any
8201 addr
= null_pointer_node
;
8204 arg2
= cp_build_addr_expr (get_dso_handle_node (),
8205 tf_warning_or_error
);
8207 /* Just pass NULL to the dso handle parm if we don't actually
8208 have a DSO handle on this target. */
8209 arg2
= null_pointer_node
;
8215 if (!CP_DECL_THREAD_LOCAL_P (decl
)
8216 && targetm
.cxx
.use_aeabi_atexit ())
8232 return cp_build_function_call_nary (atex_node
, tf_warning_or_error
,
8233 arg0
, arg1
, arg2
, NULL_TREE
);
8236 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
8237 is its initializer. Generate code to handle the construction
8238 and destruction of DECL. */
8241 expand_static_init (tree decl
, tree init
)
8243 gcc_assert (VAR_P (decl
));
8244 gcc_assert (TREE_STATIC (decl
));
8246 /* Some variables require no dynamic initialization. */
8247 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl
)))
8249 /* Make sure the destructor is callable. */
8250 cxx_maybe_build_cleanup (decl
, tf_warning_or_error
);
8255 if (CP_DECL_THREAD_LOCAL_P (decl
) && DECL_GNU_TLS_P (decl
)
8256 && !DECL_FUNCTION_SCOPE_P (decl
))
8259 error ("non-local variable %qD declared %<__thread%> "
8260 "needs dynamic initialization", decl
);
8262 error ("non-local variable %qD declared %<__thread%> "
8263 "has a non-trivial destructor", decl
);
8264 static bool informed
;
8267 inform (DECL_SOURCE_LOCATION (decl
),
8268 "C++11 %<thread_local%> allows dynamic initialization "
8275 if (DECL_FUNCTION_SCOPE_P (decl
))
8277 /* Emit code to perform this initialization but once. */
8278 tree if_stmt
= NULL_TREE
, inner_if_stmt
= NULL_TREE
;
8279 tree then_clause
= NULL_TREE
, inner_then_clause
= NULL_TREE
;
8280 tree guard
, guard_addr
;
8282 /* We don't need thread-safety code for thread-local vars. */
8283 bool thread_guard
= (flag_threadsafe_statics
8284 && !CP_DECL_THREAD_LOCAL_P (decl
));
8286 /* Emit code to perform this initialization but once. This code
8289 static <type> guard;
8290 if (!__atomic_load (guard.first_byte)) {
8291 if (__cxa_guard_acquire (&guard)) {
8294 // Do initialization.
8295 flag = true; __cxa_guard_release (&guard);
8296 // Register variable for destruction at end of program.
8298 if (!flag) __cxa_guard_abort (&guard);
8303 Note that the `flag' variable is only set to 1 *after* the
8304 initialization is complete. This ensures that an exception,
8305 thrown during the construction, will cause the variable to
8306 reinitialized when we pass through this code again, as per:
8310 If the initialization exits by throwing an exception, the
8311 initialization is not complete, so it will be tried again
8312 the next time control enters the declaration.
8314 This process should be thread-safe, too; multiple threads
8315 should not be able to initialize the variable more than
8318 /* Create the guard variable. */
8319 guard
= get_guard (decl
);
8321 /* Begin the conditional initialization. */
8322 if_stmt
= begin_if_stmt ();
8324 finish_if_stmt_cond (get_guard_cond (guard
, thread_guard
), if_stmt
);
8325 then_clause
= begin_compound_stmt (BCS_NO_SCOPE
);
8329 tree vfntype
= NULL_TREE
;
8330 tree acquire_name
, release_name
, abort_name
;
8331 tree acquire_fn
, release_fn
, abort_fn
;
8332 guard_addr
= build_address (guard
);
8334 acquire_name
= get_identifier ("__cxa_guard_acquire");
8335 release_name
= get_identifier ("__cxa_guard_release");
8336 abort_name
= get_identifier ("__cxa_guard_abort");
8337 acquire_fn
= get_global_binding (acquire_name
);
8338 release_fn
= get_global_binding (release_name
);
8339 abort_fn
= get_global_binding (abort_name
);
8341 acquire_fn
= push_library_fn
8342 (acquire_name
, build_function_type_list (integer_type_node
,
8343 TREE_TYPE (guard_addr
),
8345 NULL_TREE
, ECF_NOTHROW
| ECF_LEAF
);
8346 if (!release_fn
|| !abort_fn
)
8347 vfntype
= build_function_type_list (void_type_node
,
8348 TREE_TYPE (guard_addr
),
8351 release_fn
= push_library_fn (release_name
, vfntype
, NULL_TREE
,
8352 ECF_NOTHROW
| ECF_LEAF
);
8354 abort_fn
= push_library_fn (abort_name
, vfntype
, NULL_TREE
,
8355 ECF_NOTHROW
| ECF_LEAF
);
8357 inner_if_stmt
= begin_if_stmt ();
8358 finish_if_stmt_cond (build_call_n (acquire_fn
, 1, guard_addr
),
8361 inner_then_clause
= begin_compound_stmt (BCS_NO_SCOPE
);
8362 begin
= get_target_expr (boolean_false_node
);
8363 flag
= TARGET_EXPR_SLOT (begin
);
8365 TARGET_EXPR_CLEANUP (begin
)
8366 = build3 (COND_EXPR
, void_type_node
, flag
,
8368 build_call_n (abort_fn
, 1, guard_addr
));
8369 CLEANUP_EH_ONLY (begin
) = 1;
8371 /* Do the initialization itself. */
8372 init
= add_stmt_to_compound (begin
, init
);
8373 init
= add_stmt_to_compound
8374 (init
, build2 (MODIFY_EXPR
, void_type_node
, flag
, boolean_true_node
));
8375 init
= add_stmt_to_compound
8376 (init
, build_call_n (release_fn
, 1, guard_addr
));
8379 init
= add_stmt_to_compound (init
, set_guard (guard
));
8381 /* Use atexit to register a function for destroying this static
8383 init
= add_stmt_to_compound (init
, register_dtor_fn (decl
));
8385 finish_expr_stmt (init
);
8389 finish_compound_stmt (inner_then_clause
);
8390 finish_then_clause (inner_if_stmt
);
8391 finish_if_stmt (inner_if_stmt
);
8394 finish_compound_stmt (then_clause
);
8395 finish_then_clause (if_stmt
);
8396 finish_if_stmt (if_stmt
);
8398 else if (CP_DECL_THREAD_LOCAL_P (decl
))
8399 tls_aggregates
= tree_cons (init
, decl
, tls_aggregates
);
8401 static_aggregates
= tree_cons (init
, decl
, static_aggregates
);
8405 /* Make TYPE a complete type based on INITIAL_VALUE.
8406 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
8407 2 if there was no information (in which case assume 0 if DO_DEFAULT),
8408 3 if the initializer list is empty (in pedantic mode). */
8411 cp_complete_array_type (tree
*ptype
, tree initial_value
, bool do_default
)
8414 tree type
, elt_type
;
8416 /* Don't get confused by a CONSTRUCTOR for some other type. */
8417 if (initial_value
&& TREE_CODE (initial_value
) == CONSTRUCTOR
8418 && !BRACE_ENCLOSED_INITIALIZER_P (initial_value
)
8419 && TREE_CODE (TREE_TYPE (initial_value
)) != ARRAY_TYPE
)
8424 unsigned HOST_WIDE_INT i
;
8427 /* An array of character type can be initialized from a
8428 brace-enclosed string constant.
8430 FIXME: this code is duplicated from reshape_init. Probably
8431 we should just call reshape_init here? */
8432 if (char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (*ptype
)))
8433 && TREE_CODE (initial_value
) == CONSTRUCTOR
8434 && !vec_safe_is_empty (CONSTRUCTOR_ELTS (initial_value
)))
8436 vec
<constructor_elt
, va_gc
> *v
= CONSTRUCTOR_ELTS (initial_value
);
8437 tree value
= (*v
)[0].value
;
8439 if (TREE_CODE (value
) == STRING_CST
8440 && v
->length () == 1)
8441 initial_value
= value
;
8444 /* If any of the elements are parameter packs, we can't actually
8445 complete this type now because the array size is dependent. */
8446 if (TREE_CODE (initial_value
) == CONSTRUCTOR
)
8448 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (initial_value
),
8451 if (PACK_EXPANSION_P (value
))
8457 failure
= complete_array_type (ptype
, initial_value
, do_default
);
8459 /* We can create the array before the element type is complete, which
8460 means that we didn't have these two bits set in the original type
8461 either. In completing the type, we are expected to propagate these
8462 bits. See also complete_type which does the same thing for arrays
8465 if (type
!= error_mark_node
&& TYPE_DOMAIN (type
))
8467 elt_type
= TREE_TYPE (type
);
8468 TYPE_NEEDS_CONSTRUCTING (type
) = TYPE_NEEDS_CONSTRUCTING (elt_type
);
8469 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type
)
8470 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (elt_type
);
8476 /* As above, but either give an error or reject zero-size arrays, depending
8480 cp_complete_array_type_or_error (tree
*ptype
, tree initial_value
,
8481 bool do_default
, tsubst_flags_t complain
)
8484 bool sfinae
= !(complain
& tf_error
);
8485 /* In SFINAE context we can't be lenient about zero-size arrays. */
8488 failure
= cp_complete_array_type (ptype
, initial_value
, do_default
);
8494 /* Not an error. */;
8495 else if (failure
== 1)
8496 error ("initializer fails to determine size of %qT", *ptype
);
8497 else if (failure
== 2)
8500 error ("array size missing in %qT", *ptype
);
8502 else if (failure
== 3)
8503 error ("zero-size array %qT", *ptype
);
8504 *ptype
= error_mark_node
;
8509 /* Return zero if something is declared to be a member of type
8510 CTYPE when in the context of CUR_TYPE. STRING is the error
8511 message to print in that case. Otherwise, quietly return 1. */
8514 member_function_or_else (tree ctype
, tree cur_type
, enum overload_flags flags
)
8516 if (ctype
&& ctype
!= cur_type
)
8518 if (flags
== DTOR_FLAG
)
8519 error ("destructor for alien class %qT cannot be a member", ctype
);
8521 error ("constructor for alien class %qT cannot be a member", ctype
);
8527 /* Subroutine of `grokdeclarator'. */
8529 /* Generate errors possibly applicable for a given set of specifiers.
8530 This is for ARM $7.1.2. */
8533 bad_specifiers (tree object
,
8534 enum bad_spec_place type
,
8540 const location_t
* locations
)
8546 error_at (locations
[ds_virtual
],
8547 "%qD declared as a %<virtual%> variable", object
);
8549 error ("%<const%> and %<volatile%> function specifiers on "
8550 "%qD invalid in variable declaration", object
);
8554 error_at (locations
[ds_virtual
],
8555 "%qD declared as a %<virtual%> parameter", object
);
8557 error_at (locations
[ds_inline
],
8558 "%qD declared as an %<inline%> parameter", object
);
8560 error ("%<const%> and %<volatile%> function specifiers on "
8561 "%qD invalid in parameter declaration", object
);
8565 error_at (locations
[ds_virtual
],
8566 "%qD declared as a %<virtual%> type", object
);
8568 error_at (locations
[ds_inline
],
8569 "%qD declared as an %<inline%> type", object
);
8571 error ("%<const%> and %<volatile%> function specifiers on "
8572 "%qD invalid in type declaration", object
);
8576 error_at (locations
[ds_virtual
],
8577 "%qD declared as a %<virtual%> field", object
);
8579 error_at (locations
[ds_inline
],
8580 "%qD declared as an %<inline%> field", object
);
8582 error ("%<const%> and %<volatile%> function specifiers on "
8583 "%qD invalid in field declaration", object
);
8589 error ("%q+D declared as a friend", object
);
8591 && !flag_noexcept_type
8592 && (TREE_CODE (object
) == TYPE_DECL
8593 || (!TYPE_PTRFN_P (TREE_TYPE (object
))
8594 && !TYPE_REFFN_P (TREE_TYPE (object
))
8595 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (object
)))))
8596 error ("%q+D declared with an exception specification", object
);
8599 /* DECL is a member function or static data member and is presently
8600 being defined. Check that the definition is taking place in a
8604 check_class_member_definition_namespace (tree decl
)
8606 /* These checks only apply to member functions and static data
8608 gcc_assert (VAR_OR_FUNCTION_DECL_P (decl
));
8609 /* We check for problems with specializations in pt.c in
8610 check_specialization_namespace, where we can issue better
8612 if (processing_specialization
)
8614 /* We check this in check_explicit_instantiation_namespace. */
8615 if (processing_explicit_instantiation
)
8619 A member function definition that appears outside of the
8620 class definition shall appear in a namespace scope enclosing
8621 the class definition.
8625 The definition for a static data member shall appear in a
8626 namespace scope enclosing the member's class definition. */
8627 if (!is_ancestor (current_namespace
, DECL_CONTEXT (decl
)))
8628 permerror (input_location
, "definition of %qD is not in namespace enclosing %qT",
8629 decl
, DECL_CONTEXT (decl
));
8632 /* Build a PARM_DECL for the "this" parameter of FN. TYPE is the
8633 METHOD_TYPE for a non-static member function; QUALS are the
8634 cv-qualifiers that apply to the function. */
8637 build_this_parm (tree fn
, tree type
, cp_cv_quals quals
)
8642 cp_cv_quals this_quals
;
8644 if (CLASS_TYPE_P (type
))
8647 = cp_build_qualified_type (type
, quals
& ~TYPE_QUAL_RESTRICT
);
8648 this_type
= build_pointer_type (this_type
);
8651 this_type
= type_of_this_parm (type
);
8652 /* The `this' parameter is implicitly `const'; it cannot be
8654 this_quals
= (quals
& TYPE_QUAL_RESTRICT
) | TYPE_QUAL_CONST
;
8655 qual_type
= cp_build_qualified_type (this_type
, this_quals
);
8656 parm
= build_artificial_parm (fn
, this_identifier
, qual_type
);
8657 cp_apply_type_quals_to_decl (this_quals
, parm
);
8661 /* DECL is a static member function. Complain if it was declared
8662 with function-cv-quals. */
8665 check_static_quals (tree decl
, cp_cv_quals quals
)
8667 if (quals
!= TYPE_UNQUALIFIED
)
8668 error ("static member function %q#D declared with type qualifiers",
8672 // Check that FN takes no arguments and returns bool.
8674 check_concept_fn (tree fn
)
8676 // A constraint is nullary.
8677 if (DECL_ARGUMENTS (fn
))
8678 error_at (DECL_SOURCE_LOCATION (fn
),
8679 "concept %q#D declared with function parameters", fn
);
8681 // The declared return type of the concept shall be bool, and
8682 // it shall not be deduced from it definition.
8683 tree type
= TREE_TYPE (TREE_TYPE (fn
));
8685 error_at (DECL_SOURCE_LOCATION (fn
),
8686 "concept %q#D declared with a deduced return type", fn
);
8687 else if (type
!= boolean_type_node
)
8688 error_at (DECL_SOURCE_LOCATION (fn
),
8689 "concept %q#D with non-%<bool%> return type %qT", fn
, type
);
8692 /* Helper function. Replace the temporary this parameter injected
8693 during cp_finish_omp_declare_simd with the real this parameter. */
8696 declare_simd_adjust_this (tree
*tp
, int *walk_subtrees
, void *data
)
8698 tree this_parm
= (tree
) data
;
8699 if (TREE_CODE (*tp
) == PARM_DECL
8700 && DECL_NAME (*tp
) == this_identifier
8701 && *tp
!= this_parm
)
8703 else if (TYPE_P (*tp
))
8708 /* CTYPE is class type, or null if non-class.
8709 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
8711 DECLARATOR is the function's name.
8712 PARMS is a chain of PARM_DECLs for the function.
8713 VIRTUALP is truthvalue of whether the function is virtual or not.
8714 FLAGS are to be passed through to `grokclassfn'.
8715 QUALS are qualifiers indicating whether the function is `const'
8717 RAISES is a list of exceptions that this function can raise.
8718 CHECK is 1 if we must find this method in CTYPE, 0 if we should
8719 not look, and -1 if we should not call `grokclassfn' at all.
8721 SFK is the kind of special function (if any) for the new function.
8723 Returns `NULL_TREE' if something goes wrong, after issuing
8724 applicable error messages. */
8727 grokfndecl (tree ctype
,
8731 tree orig_declarator
,
8732 const cp_decl_specifier_seq
*declspecs
,
8735 enum overload_flags flags
,
8737 cp_ref_qualifier rqual
,
8744 special_function_kind sfk
,
8746 bool late_return_type_p
,
8750 location_t location
)
8753 int staticp
= ctype
&& TREE_CODE (type
) == FUNCTION_TYPE
;
8756 if (location
== UNKNOWN_LOCATION
)
8757 location
= input_location
;
8759 // Was the concept specifier present?
8760 bool concept_p
= inlinep
& 4;
8762 // Concept declarations must have a corresponding definition.
8763 if (concept_p
&& !funcdef_flag
)
8765 error_at (location
, "concept %qD has no definition", declarator
);
8769 type
= build_cp_fntype_variant (type
, rqual
, raises
, late_return_type_p
);
8771 decl
= build_lang_decl_loc (location
, FUNCTION_DECL
, declarator
, type
);
8773 /* Set the constraints on the declaration. */
8776 tree tmpl_reqs
= NULL_TREE
;
8777 if (processing_template_decl
> template_class_depth (ctype
))
8778 tmpl_reqs
= TEMPLATE_PARMS_CONSTRAINTS (current_template_parms
);
8780 /* Adjust the required expression into a constraint. */
8782 decl_reqs
= normalize_expression (decl_reqs
);
8784 tree ci
= build_constraints (tmpl_reqs
, decl_reqs
);
8785 set_constraints (decl
, ci
);
8788 if (TREE_CODE (type
) == METHOD_TYPE
)
8790 tree parm
= build_this_parm (decl
, type
, quals
);
8791 DECL_CHAIN (parm
) = parms
;
8794 /* Allocate space to hold the vptr bit if needed. */
8795 SET_DECL_ALIGN (decl
, MINIMUM_METHOD_BOUNDARY
);
8798 DECL_ARGUMENTS (decl
) = parms
;
8799 for (t
= parms
; t
; t
= DECL_CHAIN (t
))
8800 DECL_CONTEXT (t
) = decl
;
8802 /* Propagate volatile out from type to decl. */
8803 if (TYPE_VOLATILE (type
))
8804 TREE_THIS_VOLATILE (decl
) = 1;
8806 /* Setup decl according to sfk. */
8809 case sfk_constructor
:
8810 case sfk_copy_constructor
:
8811 case sfk_move_constructor
:
8812 DECL_CXX_CONSTRUCTOR_P (decl
) = 1;
8813 DECL_NAME (decl
) = ctor_identifier
;
8815 case sfk_destructor
:
8816 DECL_CXX_DESTRUCTOR_P (decl
) = 1;
8817 DECL_NAME (decl
) = dtor_identifier
;
8823 if (friendp
&& TREE_CODE (orig_declarator
) == TEMPLATE_ID_EXPR
)
8827 "defining explicit specialization %qD in friend declaration",
8831 tree fns
= TREE_OPERAND (orig_declarator
, 0);
8832 tree args
= TREE_OPERAND (orig_declarator
, 1);
8834 if (PROCESSING_REAL_TEMPLATE_DECL_P ())
8836 /* Something like `template <class T> friend void f<T>()'. */
8838 "invalid use of template-id %qD in declaration "
8839 "of primary template",
8845 /* A friend declaration of the form friend void f<>(). Record
8846 the information in the TEMPLATE_ID_EXPR. */
8847 SET_DECL_IMPLICIT_INSTANTIATION (decl
);
8849 gcc_assert (identifier_p (fns
)
8850 || TREE_CODE (fns
) == OVERLOAD
8851 || TREE_CODE (fns
) == FUNCTION_DECL
);
8852 DECL_TEMPLATE_INFO (decl
) = build_template_info (fns
, args
);
8854 for (t
= TYPE_ARG_TYPES (TREE_TYPE (decl
)); t
; t
= TREE_CHAIN (t
))
8855 if (TREE_PURPOSE (t
)
8856 && TREE_CODE (TREE_PURPOSE (t
)) == DEFAULT_ARG
)
8858 error_at (defarg_location (TREE_PURPOSE (t
)),
8859 "default arguments are not allowed in declaration "
8860 "of friend template specialization %qD",
8867 error_at (declspecs
->locations
[ds_inline
],
8868 "%<inline%> is not allowed in declaration of friend "
8869 "template specialization %qD",
8876 /* C++17 11.3.6/4: "If a friend declaration specifies a default argument
8877 expression, that declaration shall be a definition..." */
8878 if (friendp
&& !funcdef_flag
)
8880 for (tree t
= FUNCTION_FIRST_USER_PARMTYPE (decl
);
8881 t
&& t
!= void_list_node
; t
= TREE_CHAIN (t
))
8882 if (TREE_PURPOSE (t
))
8884 permerror (DECL_SOURCE_LOCATION (decl
),
8885 "friend declaration of %qD specifies default "
8886 "arguments and isn't a definition", decl
);
8891 /* If this decl has namespace scope, set that up. */
8893 set_decl_namespace (decl
, in_namespace
, friendp
);
8895 DECL_CONTEXT (decl
) = FROB_CONTEXT (current_decl_namespace ());
8897 /* `main' and builtins have implicit 'C' linkage. */
8898 if (ctype
== NULL_TREE
8899 && DECL_FILE_SCOPE_P (decl
)
8900 && current_lang_name
== lang_name_cplusplus
8901 && (MAIN_NAME_P (declarator
)
8902 || (IDENTIFIER_LENGTH (declarator
) > 10
8903 && IDENTIFIER_POINTER (declarator
)[0] == '_'
8904 && IDENTIFIER_POINTER (declarator
)[1] == '_'
8905 && strncmp (IDENTIFIER_POINTER (declarator
)+2,
8906 "builtin_", 8) == 0)
8907 || (targetcm
.cxx_implicit_extern_c
8908 && (targetcm
.cxx_implicit_extern_c
8909 (IDENTIFIER_POINTER (declarator
))))))
8910 SET_DECL_LANGUAGE (decl
, lang_c
);
8912 /* Should probably propagate const out from type to decl I bet (mrs). */
8915 DECL_STATIC_FUNCTION_P (decl
) = 1;
8916 DECL_CONTEXT (decl
) = ctype
;
8920 DECL_DELETED_FN (decl
) = 1;
8924 DECL_CONTEXT (decl
) = ctype
;
8926 check_class_member_definition_namespace (decl
);
8929 if (ctype
== NULL_TREE
&& DECL_MAIN_P (decl
))
8931 if (PROCESSING_REAL_TEMPLATE_DECL_P())
8932 error_at (location
, "cannot declare %<::main%> to be a template");
8934 error_at (declspecs
->locations
[ds_inline
],
8935 "cannot declare %<::main%> to be inline");
8937 error_at (declspecs
->locations
[ds_constexpr
],
8938 "cannot declare %<::main%> to be %<constexpr%>");
8940 error_at (location
, "cannot declare %<::main%> to be static");
8945 /* Members of anonymous types and local classes have no linkage; make
8946 them internal. If a typedef is made later, this will be changed. */
8947 if (ctype
&& (!TREE_PUBLIC (TYPE_MAIN_DECL (ctype
))
8948 || decl_function_context (TYPE_MAIN_DECL (ctype
))))
8951 if (publicp
&& cxx_dialect
== cxx98
)
8953 /* [basic.link]: A name with no linkage (notably, the name of a class
8954 or enumeration declared in a local scope) shall not be used to
8955 declare an entity with linkage.
8957 DR 757 relaxes this restriction for C++0x. */
8958 no_linkage_error (decl
);
8961 TREE_PUBLIC (decl
) = publicp
;
8964 DECL_INTERFACE_KNOWN (decl
) = 1;
8965 DECL_NOT_REALLY_EXTERN (decl
) = 1;
8968 /* If the declaration was declared inline, mark it as such. */
8971 DECL_DECLARED_INLINE_P (decl
) = 1;
8973 DECL_COMDAT (decl
) = 1;
8976 DECL_DECLARED_CONSTEXPR_P (decl
) = true;
8978 // If the concept declaration specifier was found, check
8979 // that the declaration satisfies the necessary requirements.
8982 DECL_DECLARED_CONCEPT_P (decl
) = true;
8983 check_concept_fn (decl
);
8986 DECL_EXTERNAL (decl
) = 1;
8987 if (TREE_CODE (type
) == FUNCTION_TYPE
)
8990 TREE_TYPE (decl
) = apply_memfn_quals (TREE_TYPE (decl
),
8997 ? G_("static member function %qD cannot have cv-qualifier")
8998 : G_("non-member function %qD cannot have cv-qualifier"),
9000 quals
= TYPE_UNQUALIFIED
;
9006 ? G_("static member function %qD cannot have ref-qualifier")
9007 : G_("non-member function %qD cannot have ref-qualifier"),
9009 rqual
= REF_QUAL_NONE
;
9013 if (deduction_guide_p (decl
))
9015 if (!DECL_NAMESPACE_SCOPE_P (decl
))
9017 error_at (location
, "deduction guide %qD must be declared at "
9018 "namespace scope", decl
);
9023 "deduction guide %qD must not have a function body", decl
);
9025 else if (IDENTIFIER_ANY_OP_P (DECL_NAME (decl
))
9026 && !grok_op_properties (decl
, /*complain=*/true))
9028 else if (UDLIT_OPER_P (DECL_NAME (decl
)))
9030 bool long_long_unsigned_p
;
9032 const char *suffix
= NULL
;
9033 /* [over.literal]/6: Literal operators shall not have C linkage. */
9034 if (DECL_LANGUAGE (decl
) == lang_c
)
9036 error_at (location
, "literal operator with C linkage");
9037 maybe_show_extern_c_location ();
9041 if (DECL_NAMESPACE_SCOPE_P (decl
))
9043 if (!check_literal_operator_args (decl
, &long_long_unsigned_p
,
9046 error_at (location
, "%qD has invalid argument list", decl
);
9050 suffix
= UDLIT_OP_SUFFIX (DECL_NAME (decl
));
9051 if (long_long_unsigned_p
)
9053 if (cpp_interpret_int_suffix (parse_in
, suffix
, strlen (suffix
)))
9054 warning_at (location
, 0, "integer suffix %qs"
9055 " shadowed by implementation", suffix
);
9057 else if (long_double_p
)
9059 if (cpp_interpret_float_suffix (parse_in
, suffix
, strlen (suffix
)))
9060 warning_at (location
, 0, "floating point suffix %qs"
9061 " shadowed by implementation", suffix
);
9064 if (suffix
[0] != '_'
9065 && !in_system_header_at (location
)
9066 && !current_function_decl
&& !(friendp
&& !funcdef_flag
))
9067 warning_at (location
, OPT_Wliteral_suffix
,
9068 "literal operator suffixes not preceded by %<_%>"
9069 " are reserved for future standardization");
9073 error_at (location
, "%qD must be a non-member function", decl
);
9079 /* Make the init_value nonzero so pushdecl knows this is not
9080 tentative. error_mark_node is replaced later with the BLOCK. */
9081 DECL_INITIAL (decl
) = error_mark_node
;
9083 if (TYPE_NOTHROW_P (type
) || nothrow_libfn_p (decl
))
9084 TREE_NOTHROW (decl
) = 1;
9086 if (flag_openmp
|| flag_openmp_simd
)
9088 /* Adjust "omp declare simd" attributes. */
9089 tree ods
= lookup_attribute ("omp declare simd", *attrlist
);
9093 for (attr
= ods
; attr
;
9094 attr
= lookup_attribute ("omp declare simd", TREE_CHAIN (attr
)))
9096 if (TREE_CODE (type
) == METHOD_TYPE
)
9097 walk_tree (&TREE_VALUE (attr
), declare_simd_adjust_this
,
9098 DECL_ARGUMENTS (decl
), NULL
);
9099 if (TREE_VALUE (attr
) != NULL_TREE
)
9101 tree cl
= TREE_VALUE (TREE_VALUE (attr
));
9102 cl
= c_omp_declare_simd_clauses_to_numbers
9103 (DECL_ARGUMENTS (decl
), cl
);
9105 TREE_VALUE (TREE_VALUE (attr
)) = cl
;
9107 TREE_VALUE (attr
) = NULL_TREE
;
9113 /* Caller will do the rest of this. */
9117 if (ctype
!= NULL_TREE
)
9118 grokclassfn (ctype
, decl
, flags
);
9121 if (cxx_dialect
>= cxx11
9122 && DECL_DESTRUCTOR_P (decl
)
9123 && !TYPE_BEING_DEFINED (DECL_CONTEXT (decl
))
9124 && !processing_template_decl
)
9125 deduce_noexcept_on_destructor (decl
);
9127 decl
= check_explicit_specialization (orig_declarator
, decl
,
9130 4 * (friendp
!= 0) +
9133 if (decl
== error_mark_node
)
9136 if (DECL_STATIC_FUNCTION_P (decl
))
9137 check_static_quals (decl
, quals
);
9141 cplus_decl_attributes (&decl
, *attrlist
, 0);
9142 *attrlist
= NULL_TREE
;
9145 /* Check main's type after attributes have been applied. */
9146 if (ctype
== NULL_TREE
&& DECL_MAIN_P (decl
))
9148 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl
)),
9151 tree oldtypeargs
= TYPE_ARG_TYPES (TREE_TYPE (decl
));
9153 error_at (declspecs
->locations
[ds_type_spec
],
9154 "%<::main%> must return %<int%>");
9155 newtype
= build_function_type (integer_type_node
, oldtypeargs
);
9156 TREE_TYPE (decl
) = newtype
;
9159 check_main_parameter_types (decl
);
9162 if (ctype
!= NULL_TREE
&& check
)
9164 tree old_decl
= check_classfn (ctype
, decl
,
9165 (processing_template_decl
9166 > template_class_depth (ctype
))
9167 ? current_template_parms
9170 if (old_decl
== error_mark_node
)
9178 if (TREE_CODE (old_decl
) == TEMPLATE_DECL
)
9179 /* Because grokfndecl is always supposed to return a
9180 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
9181 here. We depend on our callers to figure out that its
9182 really a template that's being returned. */
9183 old_decl
= DECL_TEMPLATE_RESULT (old_decl
);
9185 if (DECL_STATIC_FUNCTION_P (old_decl
)
9186 && TREE_CODE (TREE_TYPE (decl
)) == METHOD_TYPE
)
9188 /* Remove the `this' parm added by grokclassfn. */
9189 revert_static_member_fn (decl
);
9190 check_static_quals (decl
, quals
);
9192 if (DECL_ARTIFICIAL (old_decl
))
9194 error ("definition of implicitly-declared %qD", old_decl
);
9197 else if (DECL_DEFAULTED_FN (old_decl
))
9199 error ("definition of explicitly-defaulted %q+D", decl
);
9200 inform (DECL_SOURCE_LOCATION (old_decl
),
9201 "%q#D explicitly defaulted here", old_decl
);
9205 /* Since we've smashed OLD_DECL to its
9206 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
9207 if (TREE_CODE (decl
) == TEMPLATE_DECL
)
9208 decl
= DECL_TEMPLATE_RESULT (decl
);
9210 /* Attempt to merge the declarations. This can fail, in
9211 the case of some invalid specialization declarations. */
9212 pushed_scope
= push_scope (ctype
);
9213 ok
= duplicate_decls (decl
, old_decl
, friendp
);
9215 pop_scope (pushed_scope
);
9218 error ("no %q#D member function declared in class %qT",
9222 if (ok
== error_mark_node
)
9228 if (DECL_CONSTRUCTOR_P (decl
) && !grok_ctor_properties (ctype
, decl
))
9231 if (ctype
== NULL_TREE
|| check
)
9235 DECL_VIRTUAL_P (decl
) = 1;
9240 /* decl is a FUNCTION_DECL.
9241 specifiers are the parsed virt-specifiers.
9243 Set flags to reflect the virt-specifiers.
9248 set_virt_specifiers (tree decl
, cp_virt_specifiers specifiers
)
9250 if (decl
== NULL_TREE
)
9252 if (specifiers
& VIRT_SPEC_OVERRIDE
)
9253 DECL_OVERRIDE_P (decl
) = 1;
9254 if (specifiers
& VIRT_SPEC_FINAL
)
9255 DECL_FINAL_P (decl
) = 1;
9259 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
9260 the linkage that DECL will receive in the object file. */
9263 set_linkage_for_static_data_member (tree decl
)
9265 /* A static data member always has static storage duration and
9266 external linkage. Note that static data members are forbidden in
9267 local classes -- the only situation in which a class has
9268 non-external linkage. */
9269 TREE_PUBLIC (decl
) = 1;
9270 TREE_STATIC (decl
) = 1;
9271 /* For non-template classes, static data members are always put
9272 out in exactly those files where they are defined, just as
9273 with ordinary namespace-scope variables. */
9274 if (!processing_template_decl
)
9275 DECL_INTERFACE_KNOWN (decl
) = 1;
9278 /* Create a VAR_DECL named NAME with the indicated TYPE.
9280 If SCOPE is non-NULL, it is the class type or namespace containing
9281 the variable. If SCOPE is NULL, the variable should is created in
9282 the innermost enclosing scope. */
9285 grokvardecl (tree type
,
9287 tree orig_declarator
,
9288 const cp_decl_specifier_seq
*declspecs
,
9295 location_t location
)
9298 tree explicit_scope
;
9300 gcc_assert (!name
|| identifier_p (name
));
9302 bool constp
= (type_quals
& TYPE_QUAL_CONST
) != 0;
9303 bool volatilep
= (type_quals
& TYPE_QUAL_VOLATILE
) != 0;
9305 /* Compute the scope in which to place the variable, but remember
9306 whether or not that scope was explicitly specified by the user. */
9307 explicit_scope
= scope
;
9310 /* An explicit "extern" specifier indicates a namespace-scope
9312 if (declspecs
->storage_class
== sc_extern
)
9313 scope
= current_decl_namespace ();
9314 else if (!at_function_scope_p ())
9315 scope
= current_scope ();
9319 && (/* If the variable is a namespace-scope variable declared in a
9320 template, we need DECL_LANG_SPECIFIC. */
9321 (TREE_CODE (scope
) == NAMESPACE_DECL
&& processing_template_decl
)
9322 /* Similarly for namespace-scope variables with language linkage
9324 || (TREE_CODE (scope
) == NAMESPACE_DECL
9325 && current_lang_name
!= lang_name_cplusplus
)
9326 /* Similarly for static data members. */
9328 /* Similarly for explicit specializations. */
9330 && TREE_CODE (orig_declarator
) == TEMPLATE_ID_EXPR
)))
9331 decl
= build_lang_decl_loc (location
, VAR_DECL
, name
, type
);
9333 decl
= build_decl (location
, VAR_DECL
, name
, type
);
9335 if (explicit_scope
&& TREE_CODE (explicit_scope
) == NAMESPACE_DECL
)
9336 set_decl_namespace (decl
, explicit_scope
, 0);
9338 DECL_CONTEXT (decl
) = FROB_CONTEXT (scope
);
9340 if (declspecs
->storage_class
== sc_extern
)
9342 DECL_THIS_EXTERN (decl
) = 1;
9343 DECL_EXTERNAL (decl
) = !initialized
;
9346 if (DECL_CLASS_SCOPE_P (decl
))
9348 set_linkage_for_static_data_member (decl
);
9349 /* This function is only called with out-of-class definitions. */
9350 DECL_EXTERNAL (decl
) = 0;
9351 check_class_member_definition_namespace (decl
);
9353 /* At top level, either `static' or no s.c. makes a definition
9354 (perhaps tentative), and absence of `static' makes it public. */
9355 else if (toplevel_bindings_p ())
9357 TREE_PUBLIC (decl
) = (declspecs
->storage_class
!= sc_static
9358 && (DECL_THIS_EXTERN (decl
)
9362 TREE_STATIC (decl
) = ! DECL_EXTERNAL (decl
);
9364 /* Not at top level, only `static' makes a static definition. */
9367 TREE_STATIC (decl
) = declspecs
->storage_class
== sc_static
;
9368 TREE_PUBLIC (decl
) = DECL_EXTERNAL (decl
);
9371 if (decl_spec_seq_has_spec_p (declspecs
, ds_thread
))
9373 if (DECL_EXTERNAL (decl
) || TREE_STATIC (decl
))
9375 CP_DECL_THREAD_LOCAL_P (decl
) = true;
9376 if (!processing_template_decl
)
9377 set_decl_tls_model (decl
, decl_default_tls_model (decl
));
9379 if (declspecs
->gnu_thread_keyword_p
)
9380 SET_DECL_GNU_TLS_P (decl
);
9383 /* If the type of the decl has no linkage, make sure that we'll
9384 notice that in mark_used. */
9385 if (cxx_dialect
> cxx98
9386 && decl_linkage (decl
) != lk_none
9387 && DECL_LANG_SPECIFIC (decl
) == NULL
9388 && !DECL_EXTERN_C_P (decl
)
9389 && no_linkage_check (TREE_TYPE (decl
), /*relaxed_p=*/false))
9390 retrofit_lang_decl (decl
);
9392 if (TREE_PUBLIC (decl
))
9394 /* [basic.link]: A name with no linkage (notably, the name of a class
9395 or enumeration declared in a local scope) shall not be used to
9396 declare an entity with linkage.
9398 DR 757 relaxes this restriction for C++0x. */
9399 if (cxx_dialect
< cxx11
)
9400 no_linkage_error (decl
);
9403 DECL_INTERFACE_KNOWN (decl
) = 1;
9405 if (DECL_NAME (decl
)
9406 && MAIN_NAME_P (DECL_NAME (decl
))
9407 && scope
== global_namespace
)
9408 error ("cannot declare %<::main%> to be a global variable");
9410 /* Check that the variable can be safely declared as a concept.
9411 Note that this also forbids explicit specializations. */
9414 if (!processing_template_decl
)
9416 error_at (declspecs
->locations
[ds_concept
],
9417 "a non-template variable cannot be %<concept%>");
9421 DECL_DECLARED_CONCEPT_P (decl
) = true;
9422 if (!same_type_ignoring_top_level_qualifiers_p (type
, boolean_type_node
))
9423 error_at (declspecs
->locations
[ds_type_spec
],
9424 "concept must have type %<bool%>");
9426 else if (flag_concepts
9427 && processing_template_decl
> template_class_depth (scope
))
9429 tree reqs
= TEMPLATE_PARMS_CONSTRAINTS (current_template_parms
);
9430 tree ci
= build_constraints (reqs
, NULL_TREE
);
9431 set_constraints (decl
, ci
);
9434 // Handle explicit specializations and instantiations of variable templates.
9435 if (orig_declarator
)
9436 decl
= check_explicit_specialization (orig_declarator
, decl
,
9437 template_count
, conceptp
* 8);
9439 return decl
!= error_mark_node
? decl
: NULL_TREE
;
9442 /* Create and return a canonical pointer to member function type, for
9443 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
9446 build_ptrmemfunc_type (tree type
)
9451 if (type
== error_mark_node
)
9454 /* Make sure that we always have the unqualified pointer-to-member
9456 if (cp_cv_quals quals
= cp_type_quals (type
))
9458 tree unqual
= build_ptrmemfunc_type (TYPE_MAIN_VARIANT (type
));
9459 return cp_build_qualified_type (unqual
, quals
);
9462 /* If a canonical type already exists for this type, use it. We use
9463 this method instead of type_hash_canon, because it only does a
9464 simple equality check on the list of field members. */
9466 t
= TYPE_PTRMEMFUNC_TYPE (type
);
9470 t
= make_node (RECORD_TYPE
);
9472 /* Let the front end know this is a pointer to member function. */
9473 TYPE_PTRMEMFUNC_FLAG (t
) = 1;
9475 field
= build_decl (input_location
, FIELD_DECL
, pfn_identifier
, type
);
9478 field
= build_decl (input_location
, FIELD_DECL
, delta_identifier
,
9480 DECL_CHAIN (field
) = fields
;
9483 finish_builtin_struct (t
, "__ptrmemfunc_type", fields
, ptr_type_node
);
9485 /* Zap out the name so that the back end will give us the debugging
9486 information for this anonymous RECORD_TYPE. */
9487 TYPE_NAME (t
) = NULL_TREE
;
9489 /* Cache this pointer-to-member type so that we can find it again
9491 TYPE_PTRMEMFUNC_TYPE (type
) = t
;
9493 if (TYPE_STRUCTURAL_EQUALITY_P (type
))
9494 SET_TYPE_STRUCTURAL_EQUALITY (t
);
9495 else if (TYPE_CANONICAL (type
) != type
)
9496 TYPE_CANONICAL (t
) = build_ptrmemfunc_type (TYPE_CANONICAL (type
));
9501 /* Create and return a pointer to data member type. */
9504 build_ptrmem_type (tree class_type
, tree member_type
)
9506 if (TREE_CODE (member_type
) == METHOD_TYPE
)
9508 cp_cv_quals quals
= type_memfn_quals (member_type
);
9509 cp_ref_qualifier rqual
= type_memfn_rqual (member_type
);
9510 member_type
= build_memfn_type (member_type
, class_type
, quals
, rqual
);
9511 return build_ptrmemfunc_type (build_pointer_type (member_type
));
9515 gcc_assert (TREE_CODE (member_type
) != FUNCTION_TYPE
);
9516 return build_offset_type (class_type
, member_type
);
9520 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
9521 Check to see that the definition is valid. Issue appropriate error
9525 check_static_variable_definition (tree decl
, tree type
)
9527 /* Avoid redundant diagnostics on out-of-class definitions. */
9528 if (!current_class_type
|| !TYPE_BEING_DEFINED (current_class_type
))
9530 /* Can't check yet if we don't know the type. */
9531 else if (dependent_type_p (type
))
9533 /* If DECL is declared constexpr, we'll do the appropriate checks
9534 in check_initializer. Similarly for inline static data members. */
9535 else if (DECL_P (decl
)
9536 && (DECL_DECLARED_CONSTEXPR_P (decl
)
9537 || undeduced_auto_decl (decl
)
9538 || DECL_VAR_DECLARED_INLINE_P (decl
)))
9540 else if (cxx_dialect
>= cxx11
&& !INTEGRAL_OR_ENUMERATION_TYPE_P (type
))
9542 if (!COMPLETE_TYPE_P (type
))
9543 error_at (DECL_SOURCE_LOCATION (decl
),
9544 "in-class initialization of static data member %q#D of "
9545 "incomplete type", decl
);
9546 else if (literal_type_p (type
))
9547 permerror (DECL_SOURCE_LOCATION (decl
),
9548 "%<constexpr%> needed for in-class initialization of "
9549 "static data member %q#D of non-integral type", decl
);
9551 error_at (DECL_SOURCE_LOCATION (decl
),
9552 "in-class initialization of static data member %q#D of "
9553 "non-literal type", decl
);
9555 /* Motion 10 at San Diego: If a static const integral data member is
9556 initialized with an integral constant expression, the initializer
9557 may appear either in the declaration (within the class), or in
9558 the definition, but not both. If it appears in the class, the
9559 member is a member constant. The file-scope definition is always
9561 else if (!ARITHMETIC_TYPE_P (type
) && TREE_CODE (type
) != ENUMERAL_TYPE
)
9562 error_at (DECL_SOURCE_LOCATION (decl
),
9563 "invalid in-class initialization of static data member "
9564 "of non-integral type %qT",
9566 else if (!CP_TYPE_CONST_P (type
))
9567 error_at (DECL_SOURCE_LOCATION (decl
),
9568 "ISO C++ forbids in-class initialization of non-const "
9569 "static member %qD",
9571 else if (!INTEGRAL_OR_ENUMERATION_TYPE_P (type
))
9572 pedwarn (DECL_SOURCE_LOCATION (decl
), OPT_Wpedantic
,
9573 "ISO C++ forbids initialization of member constant "
9574 "%qD of non-integral type %qT", decl
, type
);
9577 /* *expr_p is part of the TYPE_SIZE of a variably-sized array. If any
9578 SAVE_EXPRs in *expr_p wrap expressions with side-effects, break those
9579 expressions out into temporary variables so that walk_tree doesn't
9580 step into them (c++/15764). */
9583 stabilize_save_expr_r (tree
*expr_p
, int *walk_subtrees
, void *data
)
9585 hash_set
<tree
> *pset
= (hash_set
<tree
> *)data
;
9586 tree expr
= *expr_p
;
9587 if (TREE_CODE (expr
) == SAVE_EXPR
)
9589 tree op
= TREE_OPERAND (expr
, 0);
9590 cp_walk_tree (&op
, stabilize_save_expr_r
, data
, pset
);
9591 if (TREE_SIDE_EFFECTS (op
))
9592 TREE_OPERAND (expr
, 0) = get_temp_regvar (TREE_TYPE (op
), op
);
9595 else if (!EXPR_P (expr
) || !TREE_SIDE_EFFECTS (expr
))
9600 /* Entry point for the above. */
9603 stabilize_vla_size (tree size
)
9605 hash_set
<tree
> pset
;
9606 /* Break out any function calls into temporary variables. */
9607 cp_walk_tree (&size
, stabilize_save_expr_r
, &pset
, &pset
);
9610 /* Reduce a SIZEOF_EXPR to its value. */
9613 fold_sizeof_expr (tree t
)
9616 if (SIZEOF_EXPR_TYPE_P (t
))
9617 r
= cxx_sizeof_or_alignof_type (TREE_TYPE (TREE_OPERAND (t
, 0)),
9618 SIZEOF_EXPR
, false, false);
9619 else if (TYPE_P (TREE_OPERAND (t
, 0)))
9620 r
= cxx_sizeof_or_alignof_type (TREE_OPERAND (t
, 0), SIZEOF_EXPR
,
9623 r
= cxx_sizeof_or_alignof_expr (TREE_OPERAND (t
, 0), SIZEOF_EXPR
,
9625 if (r
== error_mark_node
)
9630 /* Given the SIZE (i.e., number of elements) in an array, compute
9631 an appropriate index type for the array. If non-NULL, NAME is
9632 the name of the entity being declared. */
9635 compute_array_index_type_loc (location_t name_loc
, tree name
, tree size
,
9636 tsubst_flags_t complain
)
9641 if (error_operand_p (size
))
9642 return error_mark_node
;
9644 location_t loc
= cp_expr_loc_or_loc (size
, name
? name_loc
: input_location
);
9646 if (!type_dependent_expression_p (size
))
9648 osize
= size
= mark_rvalue_use (size
);
9650 if (cxx_dialect
< cxx11
&& TREE_CODE (size
) == NOP_EXPR
9651 && TREE_SIDE_EFFECTS (size
))
9652 /* In C++98, we mark a non-constant array bound with a magic
9653 NOP_EXPR with TREE_SIDE_EFFECTS; don't fold in that case. */;
9656 size
= instantiate_non_dependent_expr_sfinae (size
, complain
);
9657 size
= build_converted_constant_expr (size_type_node
, size
, complain
);
9658 /* Pedantically a constant expression is required here and so
9659 __builtin_is_constant_evaluated () should fold to true if it
9660 is successfully folded into a constant. */
9661 size
= maybe_constant_value (size
, NULL_TREE
,
9662 /*manifestly_const_eval=*/true);
9664 if (!TREE_CONSTANT (size
))
9668 if (error_operand_p (size
))
9669 return error_mark_node
;
9671 /* The array bound must be an integer type. */
9672 tree type
= TREE_TYPE (size
);
9673 if (!INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type
))
9675 if (!(complain
& tf_error
))
9676 return error_mark_node
;
9678 error_at (loc
, "size of array %qD has non-integral type %qT",
9681 error_at (loc
, "size of array has non-integral type %qT", type
);
9682 size
= integer_one_node
;
9686 /* A type is dependent if it is...an array type constructed from any
9687 dependent type or whose size is specified by a constant expression
9688 that is value-dependent. */
9689 /* We can only call value_dependent_expression_p on integral constant
9690 expressions; treat non-constant expressions as dependent, too. */
9691 if (processing_template_decl
9692 && (type_dependent_expression_p (size
)
9693 || !TREE_CONSTANT (size
) || value_dependent_expression_p (size
)))
9695 /* We cannot do any checking for a SIZE that isn't known to be
9696 constant. Just build the index type and mark that it requires
9697 structural equality checks. */
9698 itype
= build_index_type (build_min (MINUS_EXPR
, sizetype
,
9699 size
, size_one_node
));
9700 TYPE_DEPENDENT_P (itype
) = 1;
9701 TYPE_DEPENDENT_P_VALID (itype
) = 1;
9702 SET_TYPE_STRUCTURAL_EQUALITY (itype
);
9706 if (TREE_CODE (size
) != INTEGER_CST
)
9708 tree folded
= cp_fully_fold (size
);
9709 if (TREE_CODE (folded
) == INTEGER_CST
)
9712 pedwarn (loc
, OPT_Wpedantic
, "size of array %qD is not an "
9713 "integral constant-expression", name
);
9715 pedwarn (loc
, OPT_Wpedantic
,
9716 "size of array is not an integral constant-expression");
9718 /* Use the folded result for VLAs, too; it will have resolved
9723 /* Normally, the array-bound will be a constant. */
9724 if (TREE_CODE (size
) == INTEGER_CST
)
9726 /* An array must have a positive number of elements. */
9727 if (!valid_constant_size_p (size
))
9729 if (!(complain
& tf_error
))
9730 return error_mark_node
;
9733 error_at (loc
, "size of array %qD is negative", name
);
9735 error_at (loc
, "size of array is negative");
9736 size
= integer_one_node
;
9738 /* As an extension we allow zero-sized arrays. */
9739 else if (integer_zerop (size
))
9741 if (!(complain
& tf_error
))
9742 /* We must fail if performing argument deduction (as
9743 indicated by the state of complain), so that
9744 another substitution can be found. */
9745 return error_mark_node
;
9746 else if (in_system_header_at (input_location
))
9747 /* Allow them in system headers because glibc uses them. */;
9749 pedwarn (loc
, OPT_Wpedantic
,
9750 "ISO C++ forbids zero-size array %qD", name
);
9752 pedwarn (loc
, OPT_Wpedantic
,
9753 "ISO C++ forbids zero-size array");
9756 else if (TREE_CONSTANT (size
)
9757 /* We don't allow VLAs at non-function scopes, or during
9758 tentative template substitution. */
9759 || !at_function_scope_p ()
9760 || !(complain
& tf_error
))
9762 if (!(complain
& tf_error
))
9763 return error_mark_node
;
9764 /* `(int) &fn' is not a valid array bound. */
9767 "size of array %qD is not an integral constant-expression",
9770 error_at (loc
, "size of array is not an integral constant-expression");
9771 size
= integer_one_node
;
9773 else if (pedantic
&& warn_vla
!= 0)
9776 pedwarn (name_loc
, OPT_Wvla
,
9777 "ISO C++ forbids variable length array %qD", name
);
9779 pedwarn (input_location
, OPT_Wvla
,
9780 "ISO C++ forbids variable length array");
9782 else if (warn_vla
> 0)
9785 warning_at (name_loc
, OPT_Wvla
,
9786 "variable length array %qD is used", name
);
9789 "variable length array is used");
9792 if (processing_template_decl
&& !TREE_CONSTANT (size
))
9793 /* A variable sized array. */
9794 itype
= build_min (MINUS_EXPR
, sizetype
, size
, integer_one_node
);
9797 /* Compute the index of the largest element in the array. It is
9798 one less than the number of elements in the array. We save
9799 and restore PROCESSING_TEMPLATE_DECL so that computations in
9800 cp_build_binary_op will be appropriately folded. */
9802 processing_template_decl_sentinel s
;
9803 itype
= cp_build_binary_op (input_location
,
9805 cp_convert (ssizetype
, size
, complain
),
9806 cp_convert (ssizetype
, integer_one_node
,
9809 itype
= maybe_constant_value (itype
);
9812 if (!TREE_CONSTANT (itype
))
9814 /* A variable sized array. */
9815 itype
= variable_size (itype
);
9817 stabilize_vla_size (itype
);
9819 if (sanitize_flags_p (SANITIZE_VLA
)
9820 && current_function_decl
!= NULL_TREE
)
9822 /* We have to add 1 -- in the ubsan routine we generate
9823 LE_EXPR rather than LT_EXPR. */
9824 tree t
= fold_build2 (PLUS_EXPR
, TREE_TYPE (itype
), itype
,
9825 build_one_cst (TREE_TYPE (itype
)));
9826 t
= ubsan_instrument_vla (input_location
, t
);
9827 finish_expr_stmt (t
);
9830 /* Make sure that there was no overflow when creating to a signed
9831 index type. (For example, on a 32-bit machine, an array with
9832 size 2^32 - 1 is too big.) */
9833 else if (TREE_CODE (itype
) == INTEGER_CST
9834 && TREE_OVERFLOW (itype
))
9836 if (!(complain
& tf_error
))
9837 return error_mark_node
;
9838 error ("overflow in array dimension");
9839 TREE_OVERFLOW (itype
) = 0;
9843 /* Create and return the appropriate index type. */
9844 itype
= build_index_type (itype
);
9846 /* If the index type were dependent, we would have returned early, so
9847 remember that it isn't. */
9848 TYPE_DEPENDENT_P (itype
) = 0;
9849 TYPE_DEPENDENT_P_VALID (itype
) = 1;
9854 compute_array_index_type (tree name
, tree size
, tsubst_flags_t complain
)
9856 return compute_array_index_type_loc (input_location
, name
, size
, complain
);
9859 /* Returns the scope (if any) in which the entity declared by
9860 DECLARATOR will be located. If the entity was declared with an
9861 unqualified name, NULL_TREE is returned. */
9864 get_scope_of_declarator (const cp_declarator
*declarator
)
9866 while (declarator
&& declarator
->kind
!= cdk_id
)
9867 declarator
= declarator
->declarator
;
9869 /* If the declarator-id is a SCOPE_REF, the scope in which the
9870 declaration occurs is the first operand. */
9872 && declarator
->u
.id
.qualifying_scope
)
9873 return declarator
->u
.id
.qualifying_scope
;
9875 /* Otherwise, the declarator is not a qualified name; the entity will
9876 be declared in the current scope. */
9880 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
9881 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
9885 create_array_type_for_decl (tree name
, tree type
, tree size
, location_t loc
)
9887 tree itype
= NULL_TREE
;
9889 /* If things have already gone awry, bail now. */
9890 if (type
== error_mark_node
|| size
== error_mark_node
)
9891 return error_mark_node
;
9893 /* 8.3.4/1: If the type of the identifier of D contains the auto
9894 type-specifier, the program is ill-formed. */
9895 if (type_uses_auto (type
))
9898 error_at (loc
, "%qD declared as array of %qT", name
, type
);
9900 error ("creating array of %qT", type
);
9901 return error_mark_node
;
9904 /* If there are some types which cannot be array elements,
9905 issue an error-message and return. */
9906 switch (TREE_CODE (type
))
9910 error_at (loc
, "declaration of %qD as array of void", name
);
9912 error ("creating array of void");
9913 return error_mark_node
;
9917 error_at (loc
, "declaration of %qD as array of functions", name
);
9919 error ("creating array of functions");
9920 return error_mark_node
;
9922 case REFERENCE_TYPE
:
9924 error_at (loc
, "declaration of %qD as array of references", name
);
9926 error ("creating array of references");
9927 return error_mark_node
;
9931 error_at (loc
, "declaration of %qD as array of function members",
9934 error ("creating array of function members");
9935 return error_mark_node
;
9943 The constant expressions that specify the bounds of the arrays
9944 can be omitted only for the first member of the sequence. */
9945 if (TREE_CODE (type
) == ARRAY_TYPE
&& !TYPE_DOMAIN (type
))
9948 error_at (loc
, "declaration of %qD as multidimensional array must "
9949 "have bounds for all dimensions except the first",
9952 error ("multidimensional array must have bounds for all "
9953 "dimensions except the first");
9955 return error_mark_node
;
9958 /* Figure out the index type for the array. */
9960 itype
= compute_array_index_type_loc (loc
, name
, size
,
9961 tf_warning_or_error
);
9964 T is called the array element type; this type shall not be [...] an
9965 abstract class type. */
9966 abstract_virtuals_error (name
, type
);
9968 return build_cplus_array_type (type
, itype
);
9971 /* Returns the smallest location that is not UNKNOWN_LOCATION. */
9974 min_location (location_t loca
, location_t locb
)
9976 if (loca
== UNKNOWN_LOCATION
9977 || (locb
!= UNKNOWN_LOCATION
9978 && linemap_location_before_p (line_table
, locb
, loca
)))
9983 /* Returns the smallest location != UNKNOWN_LOCATION among the
9984 three stored in LOCATIONS[ds_const], LOCATIONS[ds_volatile],
9985 and LOCATIONS[ds_restrict]. */
9988 smallest_type_quals_location (int type_quals
, const location_t
* locations
)
9990 location_t loc
= UNKNOWN_LOCATION
;
9992 if (type_quals
& TYPE_QUAL_CONST
)
9993 loc
= locations
[ds_const
];
9995 if (type_quals
& TYPE_QUAL_VOLATILE
)
9996 loc
= min_location (loc
, locations
[ds_volatile
]);
9998 if (type_quals
& TYPE_QUAL_RESTRICT
)
9999 loc
= min_location (loc
, locations
[ds_restrict
]);
10004 /* Check that it's OK to declare a function with the indicated TYPE
10005 and TYPE_QUALS. SFK indicates the kind of special function (if any)
10006 that this function is. OPTYPE is the type given in a conversion
10007 operator declaration, or the class type for a constructor/destructor.
10008 Returns the actual return type of the function; that may be different
10009 than TYPE if an error occurs, or for certain special functions. */
10012 check_special_function_return_type (special_function_kind sfk
,
10016 const location_t
* locations
)
10020 case sfk_constructor
:
10022 error ("return type specification for constructor invalid");
10023 else if (type_quals
!= TYPE_UNQUALIFIED
)
10024 error_at (smallest_type_quals_location (type_quals
, locations
),
10025 "qualifiers are not allowed on constructor declaration");
10027 if (targetm
.cxx
.cdtor_returns_this ())
10028 type
= build_pointer_type (optype
);
10030 type
= void_type_node
;
10033 case sfk_destructor
:
10035 error ("return type specification for destructor invalid");
10036 else if (type_quals
!= TYPE_UNQUALIFIED
)
10037 error_at (smallest_type_quals_location (type_quals
, locations
),
10038 "qualifiers are not allowed on destructor declaration");
10040 /* We can't use the proper return type here because we run into
10041 problems with ambiguous bases and covariant returns. */
10042 if (targetm
.cxx
.cdtor_returns_this ())
10043 type
= build_pointer_type (void_type_node
);
10045 type
= void_type_node
;
10048 case sfk_conversion
:
10050 error ("return type specified for %<operator %T%>", optype
);
10051 else if (type_quals
!= TYPE_UNQUALIFIED
)
10052 error_at (smallest_type_quals_location (type_quals
, locations
),
10053 "qualifiers are not allowed on declaration of "
10054 "%<operator %T%>", optype
);
10059 case sfk_deduction_guide
:
10061 error ("return type specified for deduction guide");
10062 else if (type_quals
!= TYPE_UNQUALIFIED
)
10063 error_at (smallest_type_quals_location (type_quals
, locations
),
10064 "qualifiers are not allowed on declaration of "
10065 "deduction guide");
10066 if (TREE_CODE (optype
) == TEMPLATE_TEMPLATE_PARM
)
10068 error ("template template parameter %qT in declaration of "
10069 "deduction guide", optype
);
10070 type
= error_mark_node
;
10073 type
= make_template_placeholder (CLASSTYPE_TI_TEMPLATE (optype
));
10074 for (int i
= 0; i
< ds_last
; ++i
)
10075 if (i
!= ds_explicit
&& locations
[i
])
10076 error_at (locations
[i
],
10077 "decl-specifier in declaration of deduction guide");
10081 gcc_unreachable ();
10087 /* A variable or data member (whose unqualified name is IDENTIFIER)
10088 has been declared with the indicated TYPE. If the TYPE is not
10089 acceptable, issue an error message and return a type to use for
10090 error-recovery purposes. */
10093 check_var_type (tree identifier
, tree type
)
10095 if (VOID_TYPE_P (type
))
10098 error ("unnamed variable or field declared void");
10099 else if (identifier_p (identifier
))
10101 gcc_assert (!IDENTIFIER_ANY_OP_P (identifier
));
10102 error ("variable or field %qE declared void", identifier
);
10105 error ("variable or field declared void");
10106 type
= error_mark_node
;
10112 /* Handle declaring DECL as an inline variable. */
10115 mark_inline_variable (tree decl
, location_t loc
)
10117 bool inlinep
= true;
10118 if (! toplevel_bindings_p ())
10120 error_at (loc
, "%<inline%> specifier invalid for variable "
10121 "%qD declared at block scope", decl
);
10124 else if (cxx_dialect
< cxx17
)
10125 pedwarn (loc
, 0, "inline variables are only available "
10126 "with -std=c++17 or -std=gnu++17");
10129 retrofit_lang_decl (decl
);
10130 SET_DECL_VAR_DECLARED_INLINE_P (decl
);
10135 /* Assign a typedef-given name to a class or enumeration type declared
10136 as anonymous at first. This was split out of grokdeclarator
10137 because it is also used in libcc1. */
10140 name_unnamed_type (tree type
, tree decl
)
10142 gcc_assert (TYPE_UNNAMED_P (type
));
10144 /* Replace the anonymous name with the real name everywhere. */
10145 for (tree t
= TYPE_MAIN_VARIANT (type
); t
; t
= TYPE_NEXT_VARIANT (t
))
10147 if (anon_aggrname_p (TYPE_IDENTIFIER (t
)))
10148 /* We do not rename the debug info representing the
10149 unnamed tagged type because the standard says in
10150 [dcl.typedef] that the naming applies only for
10151 linkage purposes. */
10152 /*debug_hooks->set_name (t, decl);*/
10153 TYPE_NAME (t
) = decl
;
10156 if (TYPE_LANG_SPECIFIC (type
))
10157 TYPE_WAS_UNNAMED (type
) = 1;
10159 /* If this is a typedef within a template class, the nested
10160 type is a (non-primary) template. The name for the
10161 template needs updating as well. */
10162 if (TYPE_LANG_SPECIFIC (type
) && CLASSTYPE_TEMPLATE_INFO (type
))
10163 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type
))
10164 = TYPE_IDENTIFIER (type
);
10166 /* Adjust linkage now that we aren't unnamed anymore. */
10167 reset_type_linkage (type
);
10169 /* FIXME remangle member functions; member functions of a
10170 type with external linkage have external linkage. */
10172 /* Check that our job is done, and that it would fail if we
10173 attempted to do it again. */
10174 gcc_assert (!TYPE_UNNAMED_P (type
));
10177 /* Given declspecs and a declarator (abstract or otherwise), determine
10178 the name and type of the object declared and construct a DECL node
10181 DECLSPECS points to the representation of declaration-specifier
10182 sequence that precedes declarator.
10184 DECL_CONTEXT says which syntactic context this declaration is in:
10185 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
10186 FUNCDEF for a function definition. Like NORMAL but a few different
10187 error messages in each case. Return value may be zero meaning
10188 this definition is too screwy to try to parse.
10189 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
10190 handle member functions (which have FIELD context).
10191 Return value may be zero meaning this definition is too screwy to
10193 PARM for a parameter declaration (either within a function prototype
10194 or before a function body). Make a PARM_DECL, or return void_type_node.
10195 TPARM for a template parameter declaration.
10196 CATCHPARM for a parameter declaration before a catch clause.
10197 TYPENAME if for a typename (in a cast or sizeof).
10198 Don't make a DECL node; just return the ..._TYPE node.
10199 FIELD for a struct or union field; make a FIELD_DECL.
10200 BITFIELD for a field with specified width.
10202 INITIALIZED is as for start_decl.
10204 ATTRLIST is a pointer to the list of attributes, which may be NULL
10205 if there are none; *ATTRLIST may be modified if attributes from inside
10206 the declarator should be applied to the declaration.
10208 When this function is called, scoping variables (such as
10209 CURRENT_CLASS_TYPE) should reflect the scope in which the
10210 declaration occurs, not the scope in which the new declaration will
10211 be placed. For example, on:
10213 void S::f() { ... }
10215 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
10218 Returns a DECL (if a declarator is present), a TYPE (if there is no
10219 declarator, in cases like "struct S;"), or the ERROR_MARK_NODE if an
10223 grokdeclarator (const cp_declarator
*declarator
,
10224 cp_decl_specifier_seq
*declspecs
,
10225 enum decl_context decl_context
,
10229 tree type
= NULL_TREE
;
10231 int explicit_intN
= 0;
10232 int virtualp
, explicitp
, friendp
, inlinep
, staticp
;
10233 int explicit_int
= 0;
10234 int explicit_char
= 0;
10235 int defaulted_int
= 0;
10237 tree typedef_decl
= NULL_TREE
;
10238 const char *name
= NULL
;
10239 tree typedef_type
= NULL_TREE
;
10240 /* True if this declarator is a function definition. */
10241 bool funcdef_flag
= false;
10242 cp_declarator_kind innermost_code
= cdk_error
;
10245 /* See the code below that used this. */
10246 tree decl_attr
= NULL_TREE
;
10249 /* Keep track of what sort of function is being processed
10250 so that we can warn about default return values, or explicit
10251 return values which do not match prescribed defaults. */
10252 special_function_kind sfk
= sfk_none
;
10254 tree dname
= NULL_TREE
;
10255 tree ctor_return_type
= NULL_TREE
;
10256 enum overload_flags flags
= NO_SPECIAL
;
10257 /* cv-qualifiers that apply to the declarator, for a declaration of
10258 a member function. */
10259 cp_cv_quals memfn_quals
= TYPE_UNQUALIFIED
;
10260 /* virt-specifiers that apply to the declarator, for a declaration of
10261 a member function. */
10262 cp_virt_specifiers virt_specifiers
= VIRT_SPEC_UNSPECIFIED
;
10263 /* ref-qualifier that applies to the declarator, for a declaration of
10264 a member function. */
10265 cp_ref_qualifier rqual
= REF_QUAL_NONE
;
10266 /* cv-qualifiers that apply to the type specified by the DECLSPECS. */
10267 int type_quals
= TYPE_UNQUALIFIED
;
10268 tree raises
= NULL_TREE
;
10269 int template_count
= 0;
10270 tree returned_attrs
= NULL_TREE
;
10271 tree parms
= NULL_TREE
;
10272 const cp_declarator
*id_declarator
;
10273 /* The unqualified name of the declarator; either an
10274 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
10275 tree unqualified_id
;
10276 /* The class type, if any, in which this entity is located,
10277 or NULL_TREE if none. Note that this value may be different from
10278 the current class type; for example if an attempt is made to declare
10279 "A::f" inside "B", this value will be "A". */
10280 tree ctype
= current_class_type
;
10281 /* The NAMESPACE_DECL for the namespace in which this entity is
10282 located. If an unqualified name is used to declare the entity,
10283 this value will be NULL_TREE, even if the entity is located at
10284 namespace scope. */
10285 tree in_namespace
= NULL_TREE
;
10286 cp_storage_class storage_class
;
10287 bool unsigned_p
, signed_p
, short_p
, long_p
, thread_p
;
10288 bool type_was_error_mark_node
= false;
10289 bool parameter_pack_p
= declarator
? declarator
->parameter_pack_p
: false;
10290 bool template_type_arg
= false;
10291 bool template_parm_flag
= false;
10292 bool typedef_p
= decl_spec_seq_has_spec_p (declspecs
, ds_typedef
);
10293 bool constexpr_p
= decl_spec_seq_has_spec_p (declspecs
, ds_constexpr
);
10294 bool late_return_type_p
= false;
10295 bool array_parameter_p
= false;
10296 location_t saved_loc
= input_location
;
10297 tree reqs
= NULL_TREE
;
10299 signed_p
= decl_spec_seq_has_spec_p (declspecs
, ds_signed
);
10300 unsigned_p
= decl_spec_seq_has_spec_p (declspecs
, ds_unsigned
);
10301 short_p
= decl_spec_seq_has_spec_p (declspecs
, ds_short
);
10302 long_p
= decl_spec_seq_has_spec_p (declspecs
, ds_long
);
10303 longlong
= decl_spec_seq_has_spec_p (declspecs
, ds_long_long
);
10304 explicit_intN
= declspecs
->explicit_intN_p
;
10305 thread_p
= decl_spec_seq_has_spec_p (declspecs
, ds_thread
);
10307 // Was concept_p specified? Note that ds_concept
10308 // implies ds_constexpr!
10309 bool concept_p
= decl_spec_seq_has_spec_p (declspecs
, ds_concept
);
10311 constexpr_p
= true;
10313 if (decl_spec_seq_has_spec_p (declspecs
, ds_const
))
10314 type_quals
|= TYPE_QUAL_CONST
;
10315 if (decl_spec_seq_has_spec_p (declspecs
, ds_volatile
))
10316 type_quals
|= TYPE_QUAL_VOLATILE
;
10317 if (decl_spec_seq_has_spec_p (declspecs
, ds_restrict
))
10318 type_quals
|= TYPE_QUAL_RESTRICT
;
10320 if (decl_context
== FUNCDEF
)
10321 funcdef_flag
= true, decl_context
= NORMAL
;
10322 else if (decl_context
== MEMFUNCDEF
)
10323 funcdef_flag
= true, decl_context
= FIELD
;
10324 else if (decl_context
== BITFIELD
)
10325 bitfield
= 1, decl_context
= FIELD
;
10326 else if (decl_context
== TEMPLATE_TYPE_ARG
)
10327 template_type_arg
= true, decl_context
= TYPENAME
;
10328 else if (decl_context
== TPARM
)
10329 template_parm_flag
= true, decl_context
= PARM
;
10331 if (initialized
> 1)
10332 funcdef_flag
= true;
10334 location_t typespec_loc
= smallest_type_quals_location (type_quals
,
10335 declspecs
->locations
);
10336 if (typespec_loc
== UNKNOWN_LOCATION
)
10337 typespec_loc
= declspecs
->locations
[ds_type_spec
];
10338 if (typespec_loc
== UNKNOWN_LOCATION
)
10339 typespec_loc
= input_location
;
10341 /* Look inside a declarator for the name being declared
10342 and get it as a string, for an error message. */
10343 for (id_declarator
= declarator
;
10345 id_declarator
= id_declarator
->declarator
)
10347 if (id_declarator
->kind
!= cdk_id
)
10348 innermost_code
= id_declarator
->kind
;
10350 switch (id_declarator
->kind
)
10353 if (id_declarator
->declarator
10354 && id_declarator
->declarator
->kind
== cdk_id
)
10356 sfk
= id_declarator
->declarator
->u
.id
.sfk
;
10357 if (sfk
== sfk_destructor
)
10364 tree qualifying_scope
= id_declarator
->u
.id
.qualifying_scope
;
10365 tree decl
= id_declarator
->u
.id
.unqualified_name
;
10368 if (qualifying_scope
)
10370 if (check_for_bare_parameter_packs (qualifying_scope
,
10371 id_declarator
->id_loc
))
10372 return error_mark_node
;
10373 if (at_function_scope_p ())
10377 A declarator-id shall not be qualified except
10380 None of the cases are permitted in block
10382 if (qualifying_scope
== global_namespace
)
10383 error ("invalid use of qualified-name %<::%D%>",
10385 else if (TYPE_P (qualifying_scope
))
10386 error ("invalid use of qualified-name %<%T::%D%>",
10387 qualifying_scope
, decl
);
10389 error ("invalid use of qualified-name %<%D::%D%>",
10390 qualifying_scope
, decl
);
10391 return error_mark_node
;
10393 else if (TYPE_P (qualifying_scope
))
10395 ctype
= qualifying_scope
;
10396 if (!MAYBE_CLASS_TYPE_P (ctype
))
10398 error ("%q#T is not a class or a namespace", ctype
);
10401 else if (innermost_code
!= cdk_function
10402 && current_class_type
10403 && !uniquely_derived_from_p (ctype
,
10404 current_class_type
))
10406 error ("invalid use of qualified-name %<%T::%D%>",
10407 qualifying_scope
, decl
);
10408 return error_mark_node
;
10411 else if (TREE_CODE (qualifying_scope
) == NAMESPACE_DECL
)
10412 in_namespace
= qualifying_scope
;
10414 switch (TREE_CODE (decl
))
10418 if (innermost_code
!= cdk_function
)
10420 error ("declaration of %qD as non-function", decl
);
10421 return error_mark_node
;
10423 else if (!qualifying_scope
10424 && !(current_class_type
&& at_class_scope_p ()))
10426 error ("declaration of %qD as non-member", decl
);
10427 return error_mark_node
;
10430 tree type
= TREE_OPERAND (decl
, 0);
10432 type
= constructor_name (type
);
10433 name
= identifier_to_locale (IDENTIFIER_POINTER (type
));
10438 case TEMPLATE_ID_EXPR
:
10440 tree fns
= TREE_OPERAND (decl
, 0);
10443 if (!identifier_p (dname
))
10444 dname
= OVL_NAME (dname
);
10446 /* Fall through. */
10448 case IDENTIFIER_NODE
:
10449 if (identifier_p (decl
))
10452 if (IDENTIFIER_KEYWORD_P (dname
))
10454 error ("declarator-id missing; using reserved word %qD",
10456 name
= identifier_to_locale (IDENTIFIER_POINTER (dname
));
10458 else if (!IDENTIFIER_CONV_OP_P (dname
))
10459 name
= identifier_to_locale (IDENTIFIER_POINTER (dname
));
10462 gcc_assert (flags
== NO_SPECIAL
);
10463 flags
= TYPENAME_FLAG
;
10464 sfk
= sfk_conversion
;
10465 tree glob
= get_global_binding (dname
);
10466 if (glob
&& TREE_CODE (glob
) == TYPE_DECL
)
10467 name
= identifier_to_locale (IDENTIFIER_POINTER (dname
));
10469 name
= "<invalid operator>";
10474 gcc_unreachable ();
10481 case cdk_reference
:
10486 name
= "structured binding";
10490 return error_mark_node
;
10493 gcc_unreachable ();
10495 if (id_declarator
->kind
== cdk_id
)
10501 The declarator in a function-definition shall have the form
10502 D1 ( parameter-declaration-clause) ... */
10503 if (funcdef_flag
&& innermost_code
!= cdk_function
)
10505 error ("function definition does not declare parameters");
10506 return error_mark_node
;
10509 if (flags
== TYPENAME_FLAG
10510 && innermost_code
!= cdk_function
10511 && ! (ctype
&& !declspecs
->any_specifiers_p
))
10513 error ("declaration of %qD as non-function", dname
);
10514 return error_mark_node
;
10517 if (dname
&& identifier_p (dname
))
10519 if (UDLIT_OPER_P (dname
)
10520 && innermost_code
!= cdk_function
)
10522 error ("declaration of %qD as non-function", dname
);
10523 return error_mark_node
;
10526 if (IDENTIFIER_ANY_OP_P (dname
))
10530 error ("declaration of %qD as %<typedef%>", dname
);
10531 return error_mark_node
;
10533 else if (decl_context
== PARM
|| decl_context
== CATCHPARM
)
10535 error ("declaration of %qD as parameter", dname
);
10536 return error_mark_node
;
10541 /* Anything declared one level down from the top level
10542 must be one of the parameters of a function
10543 (because the body is at least two levels down). */
10545 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
10546 by not allowing C++ class definitions to specify their parameters
10547 with xdecls (must be spec.d in the parmlist).
10549 Since we now wait to push a class scope until we are sure that
10550 we are in a legitimate method context, we must set oldcname
10551 explicitly (since current_class_name is not yet alive).
10553 We also want to avoid calling this a PARM if it is in a namespace. */
10555 if (decl_context
== NORMAL
&& !toplevel_bindings_p ())
10557 cp_binding_level
*b
= current_binding_level
;
10558 current_binding_level
= b
->level_chain
;
10559 if (current_binding_level
!= 0 && toplevel_bindings_p ())
10560 decl_context
= PARM
;
10561 current_binding_level
= b
;
10565 name
= decl_context
== PARM
? "parameter" : "type name";
10567 if (concept_p
&& typedef_p
)
10569 error_at (declspecs
->locations
[ds_concept
],
10570 "%<concept%> cannot appear in a typedef declaration");
10571 return error_mark_node
;
10574 if (constexpr_p
&& typedef_p
)
10576 error_at (declspecs
->locations
[ds_constexpr
],
10577 "%<constexpr%> cannot appear in a typedef declaration");
10578 return error_mark_node
;
10581 /* If there were multiple types specified in the decl-specifier-seq,
10582 issue an error message. */
10583 if (declspecs
->multiple_types_p
)
10585 error ("two or more data types in declaration of %qs", name
);
10586 return error_mark_node
;
10589 if (declspecs
->conflicting_specifiers_p
)
10591 error ("conflicting specifiers in declaration of %qs", name
);
10592 return error_mark_node
;
10595 /* Extract the basic type from the decl-specifier-seq. */
10596 type
= declspecs
->type
;
10597 if (type
== error_mark_node
)
10600 type_was_error_mark_node
= true;
10602 cp_warn_deprecated_use (type
);
10603 if (type
&& TREE_CODE (type
) == TYPE_DECL
)
10605 typedef_decl
= type
;
10606 type
= TREE_TYPE (typedef_decl
);
10607 if (DECL_ARTIFICIAL (typedef_decl
))
10608 cp_warn_deprecated_use (type
);
10610 /* No type at all: default to `int', and set DEFAULTED_INT
10611 because it was not a user-defined typedef. */
10612 if (type
== NULL_TREE
)
10614 if (signed_p
|| unsigned_p
|| long_p
|| short_p
)
10616 /* These imply 'int'. */
10617 type
= integer_type_node
;
10620 /* If we just have "complex", it is equivalent to "complex double". */
10621 else if (!longlong
&& !explicit_intN
10622 && decl_spec_seq_has_spec_p (declspecs
, ds_complex
))
10624 type
= double_type_node
;
10625 pedwarn (declspecs
->locations
[ds_complex
], OPT_Wpedantic
,
10626 "ISO C++ does not support plain %<complex%> meaning "
10627 "%<double complex%>");
10630 /* Gather flags. */
10631 explicit_int
= declspecs
->explicit_int_p
;
10632 explicit_char
= declspecs
->explicit_char_p
;
10635 /* See the code below that used this. */
10637 decl_attr
= DECL_ATTRIBUTES (typedef_decl
);
10639 typedef_type
= type
;
10641 if (sfk
== sfk_conversion
|| sfk
== sfk_deduction_guide
)
10642 ctor_return_type
= TREE_TYPE (dname
);
10644 ctor_return_type
= ctype
;
10646 if (sfk
!= sfk_none
)
10648 type
= check_special_function_return_type (sfk
, type
,
10651 declspecs
->locations
);
10652 type_quals
= TYPE_UNQUALIFIED
;
10654 else if (type
== NULL_TREE
)
10660 /* We handle `main' specially here, because 'main () { }' is so
10661 common. With no options, it is allowed. With -Wreturn-type,
10662 it is a warning. It is only an error with -pedantic-errors. */
10663 is_main
= (funcdef_flag
10664 && dname
&& identifier_p (dname
)
10665 && MAIN_NAME_P (dname
)
10666 && ctype
== NULL_TREE
10667 && in_namespace
== NULL_TREE
10668 && current_namespace
== global_namespace
);
10670 if (type_was_error_mark_node
)
10671 /* We've already issued an error, don't complain more. */;
10672 else if (in_system_header_at (input_location
) || flag_ms_extensions
)
10673 /* Allow it, sigh. */;
10674 else if (! is_main
)
10675 permerror (input_location
, "ISO C++ forbids declaration of %qs with no type", name
);
10677 pedwarn (input_location
, OPT_Wpedantic
,
10678 "ISO C++ forbids declaration of %qs with no type", name
);
10680 warning (OPT_Wreturn_type
,
10681 "ISO C++ forbids declaration of %qs with no type", name
);
10683 if (type_was_error_mark_node
&& template_parm_flag
)
10684 /* FIXME we should be able to propagate the error_mark_node as is
10685 for other contexts too. */
10686 type
= error_mark_node
;
10688 type
= integer_type_node
;
10695 if (! int_n_enabled_p
[declspecs
->int_n_idx
])
10697 error ("%<__int%d%> is not supported by this target",
10698 int_n_data
[declspecs
->int_n_idx
].bitsize
);
10699 explicit_intN
= false;
10701 else if (pedantic
&& ! in_system_header_at (input_location
))
10702 pedwarn (input_location
, OPT_Wpedantic
,
10703 "ISO C++ does not support %<__int%d%> for %qs",
10704 int_n_data
[declspecs
->int_n_idx
].bitsize
, name
);
10707 /* Now process the modifiers that were specified
10708 and check for invalid combinations. */
10710 /* Long double is a special combination. */
10711 if (long_p
&& !longlong
&& TYPE_MAIN_VARIANT (type
) == double_type_node
)
10714 type
= cp_build_qualified_type (long_double_type_node
,
10715 cp_type_quals (type
));
10718 /* Check all other uses of type modifiers. */
10720 if (unsigned_p
|| signed_p
|| long_p
|| short_p
)
10727 loc
= declspecs
->locations
[ds_unsigned
];
10732 loc
= declspecs
->locations
[ds_signed
];
10737 loc
= declspecs
->locations
[ds_long_long
];
10742 loc
= declspecs
->locations
[ds_long
];
10744 else /* if (short_p) */
10747 loc
= declspecs
->locations
[ds_short
];
10752 if (signed_p
&& unsigned_p
)
10754 gcc_rich_location
richloc (declspecs
->locations
[ds_signed
]);
10755 richloc
.add_range (declspecs
->locations
[ds_unsigned
]);
10756 error_at (&richloc
,
10757 "%<signed%> and %<unsigned%> specified together");
10759 else if (long_p
&& short_p
)
10761 gcc_rich_location
richloc (declspecs
->locations
[ds_long
]);
10762 richloc
.add_range (declspecs
->locations
[ds_short
]);
10763 error_at (&richloc
, "%<long%> and %<short%> specified together");
10765 else if (TREE_CODE (type
) != INTEGER_TYPE
10766 || type
== char16_type_node
|| type
== char32_type_node
10767 || ((long_p
|| short_p
)
10768 && (explicit_char
|| explicit_intN
)))
10769 error_at (loc
, "%qs specified with %qT", key
, type
);
10770 else if (!explicit_int
&& !defaulted_int
10771 && !explicit_char
&& !explicit_intN
)
10775 pedwarn (loc
, OPT_Wpedantic
, "%qs specified with %qT",
10777 ok
= !flag_pedantic_errors
;
10779 else if (declspecs
->decltype_p
)
10780 error_at (loc
, "%qs specified with %<decltype%>", key
);
10782 error_at (loc
, "%qs specified with %<typeof%>", key
);
10787 /* Discard the type modifiers if they are invalid. */
10790 unsigned_p
= false;
10798 /* Decide whether an integer type is signed or not.
10799 Optionally treat bitfields as signed by default. */
10803 It is implementation-defined whether a plain (neither
10804 explicitly signed or unsigned) char, short, int, or long
10805 bit-field is signed or unsigned.
10807 Naturally, we extend this to long long as well. Note that
10808 this does not include wchar_t. */
10809 || (bitfield
&& !flag_signed_bitfields
10811 /* A typedef for plain `int' without `signed' can be
10812 controlled just like plain `int', but a typedef for
10813 `signed int' cannot be so controlled. */
10815 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl
))
10816 && TREE_CODE (type
) == INTEGER_TYPE
10817 && !same_type_p (TYPE_MAIN_VARIANT (type
), wchar_type_node
)))
10820 type
= int_n_trees
[declspecs
->int_n_idx
].unsigned_type
;
10822 type
= long_long_unsigned_type_node
;
10824 type
= long_unsigned_type_node
;
10826 type
= short_unsigned_type_node
;
10827 else if (type
== char_type_node
)
10828 type
= unsigned_char_type_node
;
10829 else if (typedef_decl
)
10830 type
= unsigned_type_for (type
);
10832 type
= unsigned_type_node
;
10834 else if (signed_p
&& type
== char_type_node
)
10835 type
= signed_char_type_node
;
10836 else if (explicit_intN
)
10837 type
= int_n_trees
[declspecs
->int_n_idx
].signed_type
;
10839 type
= long_long_integer_type_node
;
10841 type
= long_integer_type_node
;
10843 type
= short_integer_type_node
;
10845 if (decl_spec_seq_has_spec_p (declspecs
, ds_complex
))
10847 if (TREE_CODE (type
) != INTEGER_TYPE
&& TREE_CODE (type
) != REAL_TYPE
)
10848 error ("complex invalid for %qs", name
);
10849 /* If a modifier is specified, the resulting complex is the complex
10850 form of TYPE. E.g, "complex short" is "complex short int". */
10851 else if (type
== integer_type_node
)
10852 type
= complex_integer_type_node
;
10853 else if (type
== float_type_node
)
10854 type
= complex_float_type_node
;
10855 else if (type
== double_type_node
)
10856 type
= complex_double_type_node
;
10857 else if (type
== long_double_type_node
)
10858 type
= complex_long_double_type_node
;
10860 type
= build_complex_type (type
);
10863 /* If we're using the injected-class-name to form a compound type or a
10864 declaration, replace it with the underlying class so we don't get
10865 redundant typedefs in the debug output. But if we are returning the
10866 type unchanged, leave it alone so that it's available to
10867 maybe_get_template_decl_from_type_decl. */
10868 if (CLASS_TYPE_P (type
)
10869 && DECL_SELF_REFERENCE_P (TYPE_NAME (type
))
10870 && type
== TREE_TYPE (TYPE_NAME (type
))
10871 && (declarator
|| type_quals
))
10872 type
= DECL_ORIGINAL_TYPE (TYPE_NAME (type
));
10874 type_quals
|= cp_type_quals (type
);
10875 type
= cp_build_qualified_type_real
10876 (type
, type_quals
, ((((typedef_decl
&& !DECL_ARTIFICIAL (typedef_decl
))
10877 || declspecs
->decltype_p
)
10878 ? tf_ignore_bad_quals
: 0) | tf_warning_or_error
));
10879 /* We might have ignored or rejected some of the qualifiers. */
10880 type_quals
= cp_type_quals (type
);
10882 if (cxx_dialect
>= cxx17
&& type
&& is_auto (type
)
10883 && innermost_code
!= cdk_function
10884 && id_declarator
&& declarator
!= id_declarator
)
10885 if (tree tmpl
= CLASS_PLACEHOLDER_TEMPLATE (type
))
10887 error_at (typespec_loc
, "template placeholder type %qT must be followed "
10888 "by a simple declarator-id", type
);
10889 inform (DECL_SOURCE_LOCATION (tmpl
), "%qD declared here", tmpl
);
10893 inlinep
= decl_spec_seq_has_spec_p (declspecs
, ds_inline
);
10894 virtualp
= decl_spec_seq_has_spec_p (declspecs
, ds_virtual
);
10895 explicitp
= decl_spec_seq_has_spec_p (declspecs
, ds_explicit
);
10897 storage_class
= declspecs
->storage_class
;
10898 if (storage_class
== sc_static
)
10899 staticp
= 1 + (decl_context
== FIELD
);
10905 gcc_rich_location
richloc (declspecs
->locations
[ds_virtual
]);
10906 richloc
.add_range (declspecs
->locations
[ds_storage_class
]);
10907 error_at (&richloc
, "member %qD cannot be declared both %<virtual%> "
10908 "and %<static%>", dname
);
10909 storage_class
= sc_none
;
10912 if (constexpr_p
&& cxx_dialect
< cxx2a
)
10914 gcc_rich_location
richloc (declspecs
->locations
[ds_virtual
]);
10915 richloc
.add_range (declspecs
->locations
[ds_constexpr
]);
10916 pedwarn (&richloc
, OPT_Wpedantic
, "member %qD can be declared both "
10917 "%<virtual%> and %<constexpr%> only in -std=c++2a or "
10918 "-std=gnu++2a", dname
);
10921 friendp
= decl_spec_seq_has_spec_p (declspecs
, ds_friend
);
10923 /* Issue errors about use of storage classes for parameters. */
10924 if (decl_context
== PARM
)
10928 error_at (declspecs
->locations
[ds_typedef
],
10929 "typedef declaration invalid in parameter declaration");
10930 return error_mark_node
;
10932 else if (template_parm_flag
&& storage_class
!= sc_none
)
10934 error_at (min_location (declspecs
->locations
[ds_thread
],
10935 declspecs
->locations
[ds_storage_class
]),
10936 "storage class specified for template parameter %qs",
10938 return error_mark_node
;
10940 else if (storage_class
== sc_static
10941 || storage_class
== sc_extern
10944 error_at (min_location (declspecs
->locations
[ds_thread
],
10945 declspecs
->locations
[ds_storage_class
]),
10946 "storage class specified for parameter %qs", name
);
10947 return error_mark_node
;
10950 /* Function parameters cannot be concept. */
10952 error_at (declspecs
->locations
[ds_concept
],
10953 "a parameter cannot be declared %<concept%>");
10954 /* Function parameters cannot be constexpr. If we saw one, moan
10955 and pretend it wasn't there. */
10956 else if (constexpr_p
)
10958 error_at (declspecs
->locations
[ds_constexpr
],
10959 "a parameter cannot be declared %<constexpr%>");
10964 /* Give error if `virtual' is used outside of class declaration. */
10966 && (current_class_name
== NULL_TREE
|| decl_context
!= FIELD
))
10968 error_at (declspecs
->locations
[ds_virtual
],
10969 "%<virtual%> outside class declaration");
10973 if (innermost_code
== cdk_decomp
)
10975 location_t loc
= (declarator
->kind
== cdk_reference
10976 ? declarator
->declarator
->id_loc
: declarator
->id_loc
);
10978 error_at (declspecs
->locations
[ds_inline
],
10979 "structured binding declaration cannot be %<inline%>");
10981 error_at (declspecs
->locations
[ds_typedef
],
10982 "structured binding declaration cannot be %<typedef%>");
10984 error_at (declspecs
->locations
[ds_constexpr
], "structured "
10985 "binding declaration cannot be %<constexpr%>");
10987 error_at (declspecs
->locations
[ds_thread
],
10988 "structured binding declaration cannot be %qs",
10989 declspecs
->gnu_thread_keyword_p
10990 ? "__thread" : "thread_local");
10992 error_at (declspecs
->locations
[ds_concept
],
10993 "structured binding declaration cannot be %<concept%>");
10994 switch (storage_class
)
10999 error_at (loc
, "structured binding declaration cannot be "
11003 error_at (loc
, "structured binding declaration cannot be "
11007 error_at (loc
, "structured binding declaration cannot be "
11011 error_at (loc
, "structured binding declaration cannot be "
11015 error_at (loc
, "structured binding declaration cannot be "
11019 gcc_unreachable ();
11021 if (TREE_CODE (type
) != TEMPLATE_TYPE_PARM
11022 || TYPE_IDENTIFIER (type
) != auto_identifier
)
11024 if (type
!= error_mark_node
)
11026 error_at (loc
, "structured binding declaration cannot have "
11029 "type must be cv-qualified %<auto%> or reference to "
11030 "cv-qualified %<auto%>");
11032 type
= build_qualified_type (make_auto (), type_quals
);
11033 declspecs
->type
= type
;
11040 storage_class
= sc_none
;
11042 declspecs
->storage_class
= sc_none
;
11043 declspecs
->locations
[ds_thread
] = UNKNOWN_LOCATION
;
11046 /* Static anonymous unions are dealt with here. */
11047 if (staticp
&& decl_context
== TYPENAME
11049 && ANON_AGGR_TYPE_P (declspecs
->type
))
11050 decl_context
= FIELD
;
11052 /* Warn about storage classes that are invalid for certain
11053 kinds of declarations (parameters, typenames, etc.). */
11056 && storage_class
!= sc_extern
11057 && storage_class
!= sc_static
)
11060 error ("multiple storage classes in declaration of %qs", name
);
11063 if (decl_context
!= NORMAL
11064 && ((storage_class
!= sc_none
11065 && storage_class
!= sc_mutable
)
11068 if ((decl_context
== PARM
|| decl_context
== CATCHPARM
)
11069 && (storage_class
== sc_register
11070 || storage_class
== sc_auto
))
11072 else if (typedef_p
)
11074 else if (decl_context
== FIELD
11075 /* C++ allows static class elements. */
11076 && storage_class
== sc_static
)
11077 /* C++ also allows inlines and signed and unsigned elements,
11078 but in those cases we don't come in here. */
11083 = min_location (declspecs
->locations
[ds_thread
],
11084 declspecs
->locations
[ds_storage_class
]);
11085 if (decl_context
== FIELD
)
11086 error_at (loc
, "storage class specified for %qs", name
);
11087 else if (decl_context
== PARM
|| decl_context
== CATCHPARM
)
11088 error_at (loc
, "storage class specified for parameter %qs", name
);
11090 error_at (loc
, "storage class specified for typename");
11091 if (storage_class
== sc_register
11092 || storage_class
== sc_auto
11093 || storage_class
== sc_extern
11095 storage_class
= sc_none
;
11098 else if (storage_class
== sc_extern
&& funcdef_flag
11099 && ! toplevel_bindings_p ())
11100 error ("nested function %qs declared %<extern%>", name
);
11101 else if (toplevel_bindings_p ())
11103 if (storage_class
== sc_auto
)
11104 error ("top-level declaration of %qs specifies %<auto%>", name
);
11107 && storage_class
!= sc_extern
11108 && storage_class
!= sc_static
)
11110 if (declspecs
->gnu_thread_keyword_p
)
11111 pedwarn (declspecs
->locations
[ds_thread
],
11112 0, "function-scope %qs implicitly auto and "
11113 "declared %<__thread%>", name
);
11115 /* When thread_local is applied to a variable of block scope the
11116 storage-class-specifier static is implied if it does not appear
11118 storage_class
= declspecs
->storage_class
= sc_static
;
11122 if (storage_class
&& friendp
)
11124 error_at (min_location (declspecs
->locations
[ds_thread
],
11125 declspecs
->locations
[ds_storage_class
]),
11126 "storage class specifiers invalid in friend function "
11128 storage_class
= sc_none
;
11132 if (!id_declarator
)
11133 unqualified_id
= NULL_TREE
;
11136 unqualified_id
= id_declarator
->u
.id
.unqualified_name
;
11137 switch (TREE_CODE (unqualified_id
))
11140 unqualified_id
= TREE_OPERAND (unqualified_id
, 0);
11141 if (TYPE_P (unqualified_id
))
11142 unqualified_id
= constructor_name (unqualified_id
);
11145 case IDENTIFIER_NODE
:
11146 case TEMPLATE_ID_EXPR
:
11150 gcc_unreachable ();
11154 if (declspecs
->std_attributes
)
11156 location_t attr_loc
= declspecs
->locations
[ds_std_attribute
];
11157 if (warning_at (attr_loc
, OPT_Wattributes
, "attribute ignored"))
11158 inform (attr_loc
, "an attribute that appertains to a type-specifier "
11162 /* Determine the type of the entity declared by recurring on the
11164 for (; declarator
; declarator
= declarator
->declarator
)
11166 const cp_declarator
*inner_declarator
;
11169 if (type
== error_mark_node
)
11170 return error_mark_node
;
11172 attrs
= declarator
->attributes
;
11178 if (declarator
== NULL
|| declarator
->kind
== cdk_id
)
11179 attr_flags
|= (int) ATTR_FLAG_DECL_NEXT
;
11180 if (declarator
->kind
== cdk_function
)
11181 attr_flags
|= (int) ATTR_FLAG_FUNCTION_NEXT
;
11182 if (declarator
->kind
== cdk_array
)
11183 attr_flags
|= (int) ATTR_FLAG_ARRAY_NEXT
;
11184 returned_attrs
= decl_attributes (&type
,
11185 chainon (returned_attrs
, attrs
),
11189 inner_declarator
= declarator
->declarator
;
11191 /* We don't want to warn in parameter context because we don't
11192 yet know if the parse will succeed, and this might turn out
11193 to be a constructor call. */
11194 if (decl_context
!= PARM
11195 && decl_context
!= TYPENAME
11197 && declarator
->parenthesized
!= UNKNOWN_LOCATION
11198 /* If the type is class-like and the inner name used a
11199 global namespace qualifier, we need the parens.
11200 Unfortunately all we can tell is whether a qualified name
11201 was used or not. */
11202 && !(inner_declarator
11203 && inner_declarator
->kind
== cdk_id
11204 && inner_declarator
->u
.id
.qualifying_scope
11205 && (MAYBE_CLASS_TYPE_P (type
)
11206 || TREE_CODE (type
) == ENUMERAL_TYPE
)))
11207 warning_at (declarator
->parenthesized
, OPT_Wparentheses
,
11208 "unnecessary parentheses in declaration of %qs", name
);
11209 if (declarator
->kind
== cdk_id
|| declarator
->kind
== cdk_decomp
)
11212 switch (declarator
->kind
)
11215 type
= create_array_type_for_decl (dname
, type
,
11216 declarator
->u
.array
.bounds
,
11217 declarator
->id_loc
);
11218 if (!valid_array_size_p (input_location
, type
, dname
))
11219 type
= error_mark_node
;
11221 if (declarator
->std_attributes
)
11224 The optional attribute-specifier-seq appertains to the
11226 returned_attrs
= chainon (returned_attrs
,
11227 declarator
->std_attributes
);
11235 /* Declaring a function type. */
11237 input_location
= declspecs
->locations
[ds_type_spec
];
11238 abstract_virtuals_error (ACU_RETURN
, type
);
11239 input_location
= saved_loc
;
11241 /* Pick up type qualifiers which should be applied to `this'. */
11242 memfn_quals
= declarator
->u
.function
.qualifiers
;
11243 /* Pick up virt-specifiers. */
11244 virt_specifiers
= declarator
->u
.function
.virt_specifiers
;
11245 /* And ref-qualifier, too */
11246 rqual
= declarator
->u
.function
.ref_qualifier
;
11247 /* And tx-qualifier. */
11248 tree tx_qual
= declarator
->u
.function
.tx_qualifier
;
11249 /* Pick up the exception specifications. */
11250 raises
= declarator
->u
.function
.exception_specification
;
11251 /* If the exception-specification is ill-formed, let's pretend
11252 there wasn't one. */
11253 if (raises
== error_mark_node
)
11254 raises
= NULL_TREE
;
11257 error_at (location_of (reqs
), "requires-clause on return type");
11258 reqs
= declarator
->u
.function
.requires_clause
;
11260 /* Say it's a definition only for the CALL_EXPR
11261 closest to the identifier. */
11262 funcdecl_p
= inner_declarator
&& inner_declarator
->kind
== cdk_id
;
11264 /* Handle a late-specified return type. */
11265 tree late_return_type
= declarator
->u
.function
.late_return_type
;
11267 /* This is the case e.g. for
11268 using T = auto () -> int. */
11269 || inner_declarator
== NULL
)
11271 if (tree auto_node
= type_uses_auto (type
))
11273 if (!late_return_type
)
11275 if (current_class_type
11276 && LAMBDA_TYPE_P (current_class_type
))
11277 /* OK for C++11 lambdas. */;
11278 else if (cxx_dialect
< cxx14
)
11280 error ("%qs function uses "
11281 "%<auto%> type specifier without trailing "
11282 "return type", name
);
11283 inform (input_location
, "deduced return type "
11284 "only available with -std=c++14 or "
11289 error ("virtual function cannot "
11290 "have deduced return type");
11294 else if (!is_auto (type
) && sfk
!= sfk_conversion
)
11296 error ("%qs function with trailing return type has"
11297 " %qT as its type rather than plain %<auto%>",
11299 return error_mark_node
;
11301 else if (is_auto (type
) && AUTO_IS_DECLTYPE (type
))
11304 error ("%qs function with trailing return type has "
11305 "%<decltype(auto)%> as its type rather than "
11306 "plain %<auto%>", name
);
11308 error ("invalid use of %<decltype(auto)%>");
11309 return error_mark_node
;
11311 tree tmpl
= CLASS_PLACEHOLDER_TEMPLATE (auto_node
);
11313 if (tree late_auto
= type_uses_auto (late_return_type
))
11314 tmpl
= CLASS_PLACEHOLDER_TEMPLATE (late_auto
);
11315 if (tmpl
&& funcdecl_p
)
11317 if (!dguide_name_p (unqualified_id
))
11319 error_at (declarator
->id_loc
, "deduced class "
11320 "type %qD in function return type",
11322 inform (DECL_SOURCE_LOCATION (tmpl
),
11323 "%qD declared here", tmpl
);
11324 return error_mark_node
;
11326 else if (!late_return_type
)
11328 error_at (declarator
->id_loc
, "deduction guide "
11329 "for %qT must have trailing return "
11330 "type", TREE_TYPE (tmpl
));
11331 inform (DECL_SOURCE_LOCATION (tmpl
),
11332 "%qD declared here", tmpl
);
11333 return error_mark_node
;
11335 else if (CLASS_TYPE_P (late_return_type
)
11336 && CLASSTYPE_TEMPLATE_INFO (late_return_type
)
11337 && (CLASSTYPE_TI_TEMPLATE (late_return_type
)
11341 error ("trailing return type %qT of deduction guide "
11342 "is not a specialization of %qT",
11343 late_return_type
, TREE_TYPE (tmpl
));
11346 else if (late_return_type
11347 && sfk
!= sfk_conversion
)
11349 if (cxx_dialect
< cxx11
)
11350 /* Not using maybe_warn_cpp0x because this should
11351 always be an error. */
11352 error ("trailing return type only available with "
11353 "-std=c++11 or -std=gnu++11");
11355 error ("%qs function with trailing return type not "
11356 "declared with %<auto%> type specifier", name
);
11357 return error_mark_node
;
11360 type
= splice_late_return_type (type
, late_return_type
);
11361 if (type
== error_mark_node
)
11362 return error_mark_node
;
11364 if (late_return_type
)
11366 late_return_type_p
= true;
11367 type_quals
= cp_type_quals (type
);
11370 if (type_quals
!= TYPE_UNQUALIFIED
)
11372 if (SCALAR_TYPE_P (type
) || VOID_TYPE_P (type
))
11373 warning_at (typespec_loc
, OPT_Wignored_qualifiers
, "type "
11374 "qualifiers ignored on function return type");
11375 /* We now know that the TYPE_QUALS don't apply to the
11376 decl, but to its return type. */
11377 type_quals
= TYPE_UNQUALIFIED
;
11380 /* Error about some types functions can't return. */
11382 if (TREE_CODE (type
) == FUNCTION_TYPE
)
11384 error_at (typespec_loc
, "%qs declared as function returning "
11385 "a function", name
);
11386 return error_mark_node
;
11388 if (TREE_CODE (type
) == ARRAY_TYPE
)
11390 error_at (typespec_loc
, "%qs declared as function returning "
11392 return error_mark_node
;
11395 if (ctype
== NULL_TREE
11396 && decl_context
== FIELD
11399 ctype
= current_class_type
;
11401 if (ctype
&& (sfk
== sfk_constructor
11402 || sfk
== sfk_destructor
))
11404 /* We are within a class's scope. If our declarator name
11405 is the same as the class name, and we are defining
11406 a function, then it is a constructor/destructor, and
11407 therefore returns a void type. */
11409 /* ISO C++ 12.4/2. A destructor may not be declared
11410 const or volatile. A destructor may not be static.
11411 A destructor may not be declared with ref-qualifier.
11413 ISO C++ 12.1. A constructor may not be declared
11414 const or volatile. A constructor may not be
11415 virtual. A constructor may not be static.
11416 A constructor may not be declared with ref-qualifier. */
11418 error ((flags
== DTOR_FLAG
)
11419 ? G_("destructor cannot be static member function")
11420 : G_("constructor cannot be static member function"));
11423 error ((flags
== DTOR_FLAG
)
11424 ? G_("destructors may not be cv-qualified")
11425 : G_("constructors may not be cv-qualified"));
11426 memfn_quals
= TYPE_UNQUALIFIED
;
11431 maybe_warn_cpp0x (CPP0X_REF_QUALIFIER
);
11432 error ((flags
== DTOR_FLAG
)
11433 ? G_("destructors may not be ref-qualified")
11434 : G_("constructors may not be ref-qualified"));
11435 rqual
= REF_QUAL_NONE
;
11438 if (decl_context
== FIELD
11439 && !member_function_or_else (ctype
,
11440 current_class_type
,
11442 return error_mark_node
;
11444 if (flags
!= DTOR_FLAG
)
11446 /* It's a constructor. */
11447 if (explicitp
== 1)
11451 permerror (declspecs
->locations
[ds_virtual
],
11452 "constructors cannot be declared %<virtual%>");
11455 if (decl_context
== FIELD
11456 && sfk
!= sfk_constructor
)
11457 return error_mark_node
;
11459 if (decl_context
== FIELD
)
11466 /* Cannot be both friend and virtual. */
11467 gcc_rich_location
richloc (declspecs
->locations
[ds_virtual
]);
11468 richloc
.add_range (declspecs
->locations
[ds_friend
]);
11469 error_at (&richloc
, "virtual functions cannot be friends");
11472 if (decl_context
== NORMAL
)
11473 error ("friend declaration not in class definition");
11474 if (current_function_decl
&& funcdef_flag
)
11476 error ("can%'t define friend function %qs in a local "
11477 "class definition", name
);
11481 else if (ctype
&& sfk
== sfk_conversion
)
11483 if (explicitp
== 1)
11485 maybe_warn_cpp0x (CPP0X_EXPLICIT_CONVERSION
);
11488 if (late_return_type_p
)
11489 error ("a conversion function cannot have a trailing return type");
11491 else if (sfk
== sfk_deduction_guide
)
11493 if (explicitp
== 1)
11497 tree pushed_scope
= NULL_TREE
;
11499 && decl_context
!= FIELD
11500 && inner_declarator
->u
.id
.qualifying_scope
11501 && CLASS_TYPE_P (inner_declarator
->u
.id
.qualifying_scope
))
11503 = push_scope (inner_declarator
->u
.id
.qualifying_scope
);
11505 arg_types
= grokparms (declarator
->u
.function
.parameters
, &parms
);
11508 pop_scope (pushed_scope
);
11510 if (inner_declarator
11511 && inner_declarator
->kind
== cdk_id
11512 && inner_declarator
->u
.id
.sfk
== sfk_destructor
11513 && arg_types
!= void_list_node
)
11515 error ("destructors may not have parameters");
11516 arg_types
= void_list_node
;
11520 type
= build_function_type (type
, arg_types
);
11522 tree attrs
= declarator
->std_attributes
;
11525 tree att
= build_tree_list (tx_qual
, NULL_TREE
);
11526 /* transaction_safe applies to the type, but
11527 transaction_safe_dynamic applies to the function. */
11528 if (is_attribute_p ("transaction_safe", tx_qual
))
11529 attrs
= chainon (attrs
, att
);
11531 returned_attrs
= chainon (returned_attrs
, att
);
11536 The optional attribute-specifier-seq appertains to
11537 the function type. */
11538 decl_attributes (&type
, attrs
, 0);
11541 type
= build_exception_variant (type
, raises
);
11546 case cdk_reference
:
11548 /* Filter out pointers-to-references and references-to-references.
11549 We can get these if a TYPE_DECL is used. */
11551 if (TYPE_REF_P (type
))
11553 if (declarator
->kind
!= cdk_reference
)
11555 error ("cannot declare pointer to %q#T", type
);
11556 type
= TREE_TYPE (type
);
11559 /* In C++0x, we allow reference to reference declarations
11560 that occur indirectly through typedefs [7.1.3/8 dcl.typedef]
11561 and template type arguments [14.3.1/4 temp.arg.type]. The
11562 check for direct reference to reference declarations, which
11563 are still forbidden, occurs below. Reasoning behind the change
11564 can be found in DR106, DR540, and the rvalue reference
11566 else if (cxx_dialect
== cxx98
)
11568 error ("cannot declare reference to %q#T", type
);
11569 type
= TREE_TYPE (type
);
11572 else if (VOID_TYPE_P (type
))
11574 if (declarator
->kind
== cdk_reference
)
11575 error ("cannot declare reference to %q#T", type
);
11576 else if (declarator
->kind
== cdk_ptrmem
)
11577 error ("cannot declare pointer to %q#T member", type
);
11580 /* We now know that the TYPE_QUALS don't apply to the decl,
11581 but to the target of the pointer. */
11582 type_quals
= TYPE_UNQUALIFIED
;
11584 /* This code used to handle METHOD_TYPE, but I don't think it's
11585 possible to get it here anymore. */
11586 gcc_assert (TREE_CODE (type
) != METHOD_TYPE
);
11587 if (declarator
->kind
== cdk_ptrmem
11588 && TREE_CODE (type
) == FUNCTION_TYPE
)
11590 memfn_quals
|= type_memfn_quals (type
);
11591 type
= build_memfn_type (type
,
11592 declarator
->u
.pointer
.class_type
,
11595 if (type
== error_mark_node
)
11596 return error_mark_node
;
11598 rqual
= REF_QUAL_NONE
;
11599 memfn_quals
= TYPE_UNQUALIFIED
;
11602 if (TREE_CODE (type
) == FUNCTION_TYPE
11603 && (type_memfn_quals (type
) != TYPE_UNQUALIFIED
11604 || type_memfn_rqual (type
) != REF_QUAL_NONE
))
11605 error (declarator
->kind
== cdk_reference
11606 ? G_("cannot declare reference to qualified function type %qT")
11607 : G_("cannot declare pointer to qualified function type %qT"),
11610 /* When the pointed-to type involves components of variable size,
11611 care must be taken to ensure that the size evaluation code is
11612 emitted early enough to dominate all the possible later uses
11613 and late enough for the variables on which it depends to have
11616 This is expected to happen automatically when the pointed-to
11617 type has a name/declaration of it's own, but special attention
11618 is required if the type is anonymous.
11620 We handle the NORMAL and FIELD contexts here by inserting a
11621 dummy statement that just evaluates the size at a safe point
11622 and ensures it is not deferred until e.g. within a deeper
11623 conditional context (c++/43555).
11625 We expect nothing to be needed here for PARM or TYPENAME.
11626 Evaluating the size at this point for TYPENAME would
11627 actually be incorrect, as we might be in the middle of an
11628 expression with side effects on the pointed-to type size
11629 "arguments" prior to the pointer declaration point and the
11630 size evaluation could end up prior to the side effects. */
11632 if (!TYPE_NAME (type
)
11633 && (decl_context
== NORMAL
|| decl_context
== FIELD
)
11634 && at_function_scope_p ()
11635 && variably_modified_type_p (type
, NULL_TREE
))
11637 TYPE_NAME (type
) = build_decl (UNKNOWN_LOCATION
, TYPE_DECL
,
11639 add_decl_expr (TYPE_NAME (type
));
11642 if (declarator
->kind
== cdk_reference
)
11644 /* In C++0x, the type we are creating a reference to might be
11645 a typedef which is itself a reference type. In that case,
11646 we follow the reference collapsing rules in
11647 [7.1.3/8 dcl.typedef] to create the final reference type:
11649 "If a typedef TD names a type that is a reference to a type
11650 T, an attempt to create the type 'lvalue reference to cv TD'
11651 creates the type 'lvalue reference to T,' while an attempt
11652 to create the type "rvalue reference to cv TD' creates the
11655 if (VOID_TYPE_P (type
))
11656 /* We already gave an error. */;
11657 else if (TYPE_REF_P (type
))
11659 if (declarator
->u
.reference
.rvalue_ref
)
11660 /* Leave type alone. */;
11662 type
= cp_build_reference_type (TREE_TYPE (type
), false);
11665 type
= cp_build_reference_type
11666 (type
, declarator
->u
.reference
.rvalue_ref
);
11668 /* In C++0x, we need this check for direct reference to
11669 reference declarations, which are forbidden by
11670 [8.3.2/5 dcl.ref]. Reference to reference declarations
11671 are only allowed indirectly through typedefs and template
11672 type arguments. Example:
11674 void foo(int & &); // invalid ref-to-ref decl
11676 typedef int & int_ref;
11677 void foo(int_ref &); // valid ref-to-ref decl
11679 if (inner_declarator
&& inner_declarator
->kind
== cdk_reference
)
11680 error ("cannot declare reference to %q#T, which is not "
11681 "a typedef or a template type argument", type
);
11683 else if (TREE_CODE (type
) == METHOD_TYPE
)
11684 type
= build_ptrmemfunc_type (build_pointer_type (type
));
11685 else if (declarator
->kind
== cdk_ptrmem
)
11687 gcc_assert (TREE_CODE (declarator
->u
.pointer
.class_type
)
11688 != NAMESPACE_DECL
);
11689 if (declarator
->u
.pointer
.class_type
== error_mark_node
)
11690 /* We will already have complained. */
11691 type
= error_mark_node
;
11693 type
= build_ptrmem_type (declarator
->u
.pointer
.class_type
,
11697 type
= build_pointer_type (type
);
11699 /* Process a list of type modifier keywords (such as
11700 const or volatile) that were given inside the `*' or `&'. */
11702 if (declarator
->u
.pointer
.qualifiers
)
11705 = cp_build_qualified_type (type
,
11706 declarator
->u
.pointer
.qualifiers
);
11707 type_quals
= cp_type_quals (type
);
11710 /* Apply C++11 attributes to the pointer, and not to the
11711 type pointed to. This is unlike what is done for GNU
11712 attributes above. It is to comply with [dcl.ptr]/1:
11714 [the optional attribute-specifier-seq (7.6.1) appertains
11715 to the pointer and not to the object pointed to]. */
11716 if (declarator
->std_attributes
)
11717 decl_attributes (&type
, declarator
->std_attributes
,
11727 gcc_unreachable ();
11731 /* A `constexpr' specifier used in an object declaration declares
11732 the object as `const'. */
11733 if (constexpr_p
&& innermost_code
!= cdk_function
)
11735 /* DR1688 says that a `constexpr' specifier in combination with
11736 `volatile' is valid. */
11738 if (!TYPE_REF_P (type
))
11740 type_quals
|= TYPE_QUAL_CONST
;
11741 type
= cp_build_qualified_type (type
, type_quals
);
11745 if (unqualified_id
&& TREE_CODE (unqualified_id
) == TEMPLATE_ID_EXPR
11746 && TREE_CODE (type
) != FUNCTION_TYPE
11747 && TREE_CODE (type
) != METHOD_TYPE
11748 && !variable_template_p (TREE_OPERAND (unqualified_id
, 0)))
11750 error ("template-id %qD used as a declarator",
11752 unqualified_id
= dname
;
11755 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
11756 qualified with a class-name, turn it into a METHOD_TYPE, unless
11757 we know that the function is static. We take advantage of this
11758 opportunity to do other processing that pertains to entities
11759 explicitly declared to be class members. Note that if DECLARATOR
11760 is non-NULL, we know it is a cdk_id declarator; otherwise, we
11761 would not have exited the loop above. */
11763 && declarator
->kind
== cdk_id
11764 && declarator
->u
.id
.qualifying_scope
11765 && MAYBE_CLASS_TYPE_P (declarator
->u
.id
.qualifying_scope
))
11767 ctype
= declarator
->u
.id
.qualifying_scope
;
11768 ctype
= TYPE_MAIN_VARIANT (ctype
);
11769 template_count
= num_template_headers_for_class (ctype
);
11771 if (ctype
== current_class_type
)
11775 permerror (input_location
, "member functions are implicitly "
11776 "friends of their class");
11780 permerror (declarator
->id_loc
,
11781 "extra qualification %<%T::%> on member %qs",
11784 else if (/* If the qualifying type is already complete, then we
11785 can skip the following checks. */
11786 !COMPLETE_TYPE_P (ctype
)
11787 && (/* If the function is being defined, then
11788 qualifying type must certainly be complete. */
11790 /* A friend declaration of "T::f" is OK, even if
11791 "T" is a template parameter. But, if this
11792 function is not a friend, the qualifying type
11793 must be a class. */
11794 || (!friendp
&& !CLASS_TYPE_P (ctype
))
11795 /* For a declaration, the type need not be
11796 complete, if either it is dependent (since there
11797 is no meaningful definition of complete in that
11798 case) or the qualifying class is currently being
11800 || !(dependent_type_p (ctype
)
11801 || currently_open_class (ctype
)))
11802 /* Check that the qualifying type is complete. */
11803 && !complete_type_or_else (ctype
, NULL_TREE
))
11804 return error_mark_node
;
11805 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
11807 if (current_class_type
11808 && (!friendp
|| funcdef_flag
|| initialized
))
11810 error (funcdef_flag
|| initialized
11811 ? G_("cannot define member function %<%T::%s%> "
11813 : G_("cannot declare member function %<%T::%s%> "
11815 ctype
, name
, current_class_type
);
11816 return error_mark_node
;
11819 else if (typedef_p
&& current_class_type
)
11821 error ("cannot declare member %<%T::%s%> within %qT",
11822 ctype
, name
, current_class_type
);
11823 return error_mark_node
;
11827 if (ctype
== NULL_TREE
&& decl_context
== FIELD
&& friendp
== 0)
11828 ctype
= current_class_type
;
11830 /* Now TYPE has the actual type. */
11832 if (returned_attrs
)
11835 *attrlist
= chainon (returned_attrs
, *attrlist
);
11837 attrlist
= &returned_attrs
;
11841 && declarator
->kind
== cdk_id
11842 && declarator
->std_attributes
11843 && attrlist
!= NULL
)
11845 /* [dcl.meaning]/1: The optional attribute-specifier-seq following
11846 a declarator-id appertains to the entity that is declared. */
11847 if (declarator
->std_attributes
!= error_mark_node
)
11848 *attrlist
= chainon (*attrlist
, declarator
->std_attributes
);
11850 /* We should have already diagnosed the issue (c++/78344). */
11851 gcc_assert (seen_error ());
11854 /* Handle parameter packs. */
11855 if (parameter_pack_p
)
11857 if (decl_context
== PARM
)
11858 /* Turn the type into a pack expansion.*/
11859 type
= make_pack_expansion (type
);
11861 error ("non-parameter %qs cannot be a parameter pack", name
);
11864 if ((decl_context
== FIELD
|| decl_context
== PARM
)
11865 && !processing_template_decl
11866 && variably_modified_type_p (type
, NULL_TREE
))
11868 if (decl_context
== FIELD
)
11869 error ("data member may not have variably modified type %qT", type
);
11871 error ("parameter may not have variably modified type %qT", type
);
11872 type
= error_mark_node
;
11875 if (explicitp
== 1 || (explicitp
&& friendp
))
11877 /* [dcl.fct.spec] (C++11) The explicit specifier shall be used only
11878 in the declaration of a constructor or conversion function within
11879 a class definition. */
11880 if (!current_class_type
)
11881 error_at (declspecs
->locations
[ds_explicit
],
11882 "%<explicit%> outside class declaration");
11884 error_at (declspecs
->locations
[ds_explicit
],
11885 "%<explicit%> in friend declaration");
11887 error_at (declspecs
->locations
[ds_explicit
],
11888 "only declarations of constructors and conversion operators "
11889 "can be %<explicit%>");
11893 if (storage_class
== sc_mutable
)
11895 if (decl_context
!= FIELD
|| friendp
)
11897 error ("non-member %qs cannot be declared %<mutable%>", name
);
11898 storage_class
= sc_none
;
11900 else if (decl_context
== TYPENAME
|| typedef_p
)
11902 error ("non-object member %qs cannot be declared %<mutable%>", name
);
11903 storage_class
= sc_none
;
11905 else if (TREE_CODE (type
) == FUNCTION_TYPE
11906 || TREE_CODE (type
) == METHOD_TYPE
)
11908 error ("function %qs cannot be declared %<mutable%>", name
);
11909 storage_class
= sc_none
;
11913 error ("static %qs cannot be declared %<mutable%>", name
);
11914 storage_class
= sc_none
;
11916 else if (type_quals
& TYPE_QUAL_CONST
)
11918 error ("const %qs cannot be declared %<mutable%>", name
);
11919 storage_class
= sc_none
;
11921 else if (TYPE_REF_P (type
))
11923 permerror (input_location
, "reference %qs cannot be declared "
11924 "%<mutable%>", name
);
11925 storage_class
= sc_none
;
11929 /* If this is declaring a typedef name, return a TYPE_DECL. */
11930 if (typedef_p
&& decl_context
!= TYPENAME
)
11932 bool alias_p
= decl_spec_seq_has_spec_p (declspecs
, ds_alias
);
11935 /* This declaration:
11937 typedef void f(int) const;
11939 declares a function type which is not a member of any
11940 particular class, but which is cv-qualified; for
11941 example "f S::*" declares a pointer to a const-qualified
11942 member function of S. We record the cv-qualification in the
11944 if ((rqual
|| memfn_quals
) && TREE_CODE (type
) == FUNCTION_TYPE
)
11946 type
= apply_memfn_quals (type
, memfn_quals
, rqual
);
11948 /* We have now dealt with these qualifiers. */
11949 memfn_quals
= TYPE_UNQUALIFIED
;
11950 rqual
= REF_QUAL_NONE
;
11953 if (type_uses_auto (type
))
11956 error_at (declspecs
->locations
[ds_type_spec
],
11957 "%<auto%> not allowed in alias declaration");
11959 error_at (declspecs
->locations
[ds_type_spec
],
11960 "typedef declared %<auto%>");
11961 type
= error_mark_node
;
11965 error_at (location_of (reqs
), "requires-clause on typedef");
11967 if (id_declarator
&& declarator
->u
.id
.qualifying_scope
)
11969 error ("typedef name may not be a nested-name-specifier");
11970 type
= error_mark_node
;
11973 if (decl_context
== FIELD
)
11974 decl
= build_lang_decl (TYPE_DECL
, unqualified_id
, type
);
11976 decl
= build_decl (input_location
, TYPE_DECL
, unqualified_id
, type
);
11978 if (decl_context
!= FIELD
)
11980 if (!current_function_decl
)
11981 DECL_CONTEXT (decl
) = FROB_CONTEXT (current_namespace
);
11982 else if (DECL_MAYBE_IN_CHARGE_CDTOR_P (current_function_decl
))
11983 /* The TYPE_DECL is "abstract" because there will be
11984 clones of this constructor/destructor, and there will
11985 be copies of this TYPE_DECL generated in those
11986 clones. The decloning optimization (for space) may
11987 revert this subsequently if it determines that
11988 the clones should share a common implementation. */
11989 DECL_ABSTRACT_P (decl
) = true;
11991 else if (current_class_type
11992 && constructor_name_p (unqualified_id
, current_class_type
))
11993 permerror (input_location
, "ISO C++ forbids nested type %qD with same name "
11994 "as enclosing class",
11997 /* If the user declares "typedef struct {...} foo" then the
11998 struct will have an anonymous name. Fill that name in now.
11999 Nothing can refer to it, so nothing needs know about the name
12001 if (type
!= error_mark_node
12003 && TYPE_NAME (type
)
12004 && TREE_CODE (TYPE_NAME (type
)) == TYPE_DECL
12005 && TYPE_UNNAMED_P (type
)
12006 && declspecs
->type_definition_p
12007 && attributes_naming_typedef_ok (*attrlist
)
12008 && cp_type_quals (type
) == TYPE_UNQUALIFIED
)
12009 name_unnamed_type (type
, decl
);
12012 || (typedef_decl
&& C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl
)))
12013 C_TYPEDEF_EXPLICITLY_SIGNED (decl
) = 1;
12015 bad_specifiers (decl
, BSP_TYPE
, virtualp
,
12016 memfn_quals
!= TYPE_UNQUALIFIED
,
12017 inlinep
, friendp
, raises
!= NULL_TREE
,
12018 declspecs
->locations
);
12021 /* Acknowledge that this was written:
12022 `using analias = atype;'. */
12023 TYPE_DECL_ALIAS_P (decl
) = 1;
12028 /* Detect the case of an array type of unspecified size
12029 which came, as such, direct from a typedef name.
12030 We must copy the type, so that the array's domain can be
12031 individually set by the object's initializer. */
12033 if (type
&& typedef_type
12034 && TREE_CODE (type
) == ARRAY_TYPE
&& !TYPE_DOMAIN (type
)
12035 && TYPE_MAIN_VARIANT (type
) == TYPE_MAIN_VARIANT (typedef_type
))
12036 type
= build_cplus_array_type (TREE_TYPE (type
), NULL_TREE
);
12038 /* Detect where we're using a typedef of function type to declare a
12039 function. PARMS will not be set, so we must create it now. */
12041 if (type
== typedef_type
&& TREE_CODE (type
) == FUNCTION_TYPE
)
12043 tree decls
= NULL_TREE
;
12046 for (args
= TYPE_ARG_TYPES (type
);
12047 args
&& args
!= void_list_node
;
12048 args
= TREE_CHAIN (args
))
12050 tree decl
= cp_build_parm_decl (NULL_TREE
, NULL_TREE
,
12051 TREE_VALUE (args
));
12053 DECL_CHAIN (decl
) = decls
;
12057 parms
= nreverse (decls
);
12059 if (decl_context
!= TYPENAME
)
12061 /* The qualifiers on the function type become the qualifiers on
12062 the non-static member function. */
12063 memfn_quals
|= type_memfn_quals (type
);
12064 rqual
= type_memfn_rqual (type
);
12065 type_quals
= TYPE_UNQUALIFIED
;
12069 /* If this is a type name (such as, in a cast or sizeof),
12070 compute the type and return it now. */
12072 if (decl_context
== TYPENAME
)
12074 /* Note that here we don't care about type_quals. */
12076 /* Special case: "friend class foo" looks like a TYPENAME context. */
12081 error ("%<inline%> specified for friend class declaration");
12087 /* Don't allow friend declaration without a class-key. */
12088 if (TREE_CODE (type
) == TEMPLATE_TYPE_PARM
)
12089 permerror (input_location
, "template parameters cannot be friends");
12090 else if (TREE_CODE (type
) == TYPENAME_TYPE
)
12091 permerror (input_location
, "friend declaration requires class-key, "
12092 "i.e. %<friend class %T::%D%>",
12093 TYPE_CONTEXT (type
), TYPENAME_TYPE_FULLNAME (type
));
12095 permerror (input_location
, "friend declaration requires class-key, "
12096 "i.e. %<friend %#T%>",
12100 /* Only try to do this stuff if we didn't already give up. */
12101 if (type
!= integer_type_node
)
12103 /* A friendly class? */
12104 if (current_class_type
)
12105 make_friend_class (current_class_type
, TYPE_MAIN_VARIANT (type
),
12106 /*complain=*/true);
12108 error ("trying to make class %qT a friend of global scope",
12111 type
= void_type_node
;
12114 else if (memfn_quals
|| rqual
)
12116 if (ctype
== NULL_TREE
12117 && TREE_CODE (type
) == METHOD_TYPE
)
12118 ctype
= TYPE_METHOD_BASETYPE (type
);
12121 type
= build_memfn_type (type
, ctype
, memfn_quals
, rqual
);
12122 /* Core issue #547: need to allow this in template type args.
12123 Allow it in general in C++11 for alias-declarations. */
12124 else if ((template_type_arg
|| cxx_dialect
>= cxx11
)
12125 && TREE_CODE (type
) == FUNCTION_TYPE
)
12126 type
= apply_memfn_quals (type
, memfn_quals
, rqual
);
12128 error ("invalid qualifiers on non-member function type");
12132 error_at (location_of (reqs
), "requires-clause on type-id");
12136 else if (unqualified_id
== NULL_TREE
&& decl_context
!= PARM
12137 && decl_context
!= CATCHPARM
12138 && TREE_CODE (type
) != UNION_TYPE
12140 && innermost_code
!= cdk_decomp
)
12142 error ("abstract declarator %qT used as declaration", type
);
12143 return error_mark_node
;
12146 if (!FUNC_OR_METHOD_TYPE_P (type
))
12148 /* Only functions may be declared using an operator-function-id. */
12149 if (dname
&& IDENTIFIER_ANY_OP_P (dname
))
12151 error ("declaration of %qD as non-function", dname
);
12152 return error_mark_node
;
12156 error_at (location_of (reqs
),
12157 "requires-clause on declaration of non-function type %qT",
12161 /* We don't check parameter types here because we can emit a better
12162 error message later. */
12163 if (decl_context
!= PARM
)
12165 type
= check_var_type (unqualified_id
, type
);
12166 if (type
== error_mark_node
)
12167 return error_mark_node
;
12170 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
12171 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
12173 if (decl_context
== PARM
|| decl_context
== CATCHPARM
)
12175 if (ctype
|| in_namespace
)
12176 error ("cannot use %<::%> in parameter declaration");
12178 if (type_uses_auto (type
)
12179 && !(cxx_dialect
>= cxx17
&& template_parm_flag
))
12181 if (cxx_dialect
>= cxx14
)
12182 error ("%<auto%> parameter not permitted in this context");
12184 error ("parameter declared %<auto%>");
12185 type
= error_mark_node
;
12188 /* A parameter declared as an array of T is really a pointer to T.
12189 One declared as a function is really a pointer to a function.
12190 One declared as a member is really a pointer to member. */
12192 if (TREE_CODE (type
) == ARRAY_TYPE
)
12194 /* Transfer const-ness of array into that of type pointed to. */
12195 type
= build_pointer_type (TREE_TYPE (type
));
12196 type_quals
= TYPE_UNQUALIFIED
;
12197 array_parameter_p
= true;
12199 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
12200 type
= build_pointer_type (type
);
12203 if (ctype
&& TREE_CODE (type
) == FUNCTION_TYPE
&& staticp
< 2
12204 && !(unqualified_id
12205 && identifier_p (unqualified_id
)
12206 && IDENTIFIER_NEWDEL_OP_P (unqualified_id
)))
12208 cp_cv_quals real_quals
= memfn_quals
;
12209 if (cxx_dialect
< cxx14
&& constexpr_p
12210 && sfk
!= sfk_constructor
&& sfk
!= sfk_destructor
)
12211 real_quals
|= TYPE_QUAL_CONST
;
12212 type
= build_memfn_type (type
, ctype
, real_quals
, rqual
);
12216 tree decl
= NULL_TREE
;
12217 location_t loc
= declarator
? declarator
->id_loc
: input_location
;
12219 if (decl_context
== PARM
)
12221 decl
= cp_build_parm_decl (NULL_TREE
, unqualified_id
, type
);
12222 DECL_ARRAY_PARAMETER_P (decl
) = array_parameter_p
;
12224 bad_specifiers (decl
, BSP_PARM
, virtualp
,
12225 memfn_quals
!= TYPE_UNQUALIFIED
,
12226 inlinep
, friendp
, raises
!= NULL_TREE
,
12227 declspecs
->locations
);
12229 else if (decl_context
== FIELD
)
12231 if (!staticp
&& !friendp
&& TREE_CODE (type
) != METHOD_TYPE
)
12232 if (tree auto_node
= type_uses_auto (type
))
12234 location_t tloc
= declspecs
->locations
[ds_type_spec
];
12235 if (CLASS_PLACEHOLDER_TEMPLATE (auto_node
))
12236 error_at (tloc
, "invalid use of template-name %qE without an "
12238 CLASS_PLACEHOLDER_TEMPLATE (auto_node
));
12240 error_at (tloc
, "non-static data member declared with "
12241 "placeholder %qT", auto_node
);
12242 type
= error_mark_node
;
12245 /* The C99 flexible array extension. */
12246 if (!staticp
&& TREE_CODE (type
) == ARRAY_TYPE
12247 && TYPE_DOMAIN (type
) == NULL_TREE
)
12250 && (TREE_CODE (ctype
) == UNION_TYPE
12251 || TREE_CODE (ctype
) == QUAL_UNION_TYPE
))
12253 error ("flexible array member in union");
12254 type
= error_mark_node
;
12258 /* Array is a flexible member. */
12259 if (in_system_header_at (input_location
))
12260 /* Do not warn on flexible array members in system
12261 headers because glibc uses them. */;
12262 else if (name
&& declarator
)
12263 pedwarn (declarator
->id_loc
, OPT_Wpedantic
,
12264 "ISO C++ forbids flexible array member %qs", name
);
12266 pedwarn (input_location
, OPT_Wpedantic
,
12267 "ISO C++ forbids flexible array members");
12269 /* Flexible array member has a null domain. */
12270 type
= build_cplus_array_type (TREE_TYPE (type
), NULL_TREE
);
12274 if (type
== error_mark_node
)
12276 /* Happens when declaring arrays of sizes which
12277 are error_mark_node, for example. */
12280 else if (in_namespace
&& !friendp
)
12282 /* Something like struct S { int N::j; }; */
12283 error ("invalid use of %<::%>");
12284 return error_mark_node
;
12286 else if (FUNC_OR_METHOD_TYPE_P (type
) && unqualified_id
)
12289 tree function_context
;
12293 /* This should never happen in pure C++ (the check
12294 could be an assert). It could happen in
12295 Objective-C++ if someone writes invalid code that
12296 uses a function declaration for an instance
12297 variable or property (instance variables and
12298 properties are parsed as FIELD_DECLs, but they are
12299 part of an Objective-C class, not a C++ class).
12300 That code is invalid and is caught by this
12304 error ("declaration of function %qD in invalid context",
12306 return error_mark_node
;
12309 /* ``A union may [ ... ] not [ have ] virtual functions.''
12311 if (virtualp
&& TREE_CODE (ctype
) == UNION_TYPE
)
12313 error_at (declspecs
->locations
[ds_virtual
],
12314 "function %qD declared %<virtual%> inside a union",
12316 return error_mark_node
;
12320 && identifier_p (unqualified_id
)
12321 && IDENTIFIER_NEWDEL_OP_P (unqualified_id
))
12323 error_at (declspecs
->locations
[ds_virtual
],
12324 "%qD cannot be declared %<virtual%>, since it "
12325 "is always static", unqualified_id
);
12330 /* Check that the name used for a destructor makes sense. */
12331 if (sfk
== sfk_destructor
)
12333 tree uqname
= id_declarator
->u
.id
.unqualified_name
;
12337 gcc_assert (friendp
);
12338 error ("expected qualified name in friend declaration "
12339 "for destructor %qD", uqname
);
12340 return error_mark_node
;
12343 if (!check_dtor_name (ctype
, TREE_OPERAND (uqname
, 0)))
12345 error ("declaration of %qD as member of %qT",
12347 return error_mark_node
;
12351 error_at (declspecs
->locations
[ds_concept
],
12352 "a destructor cannot be %<concept%>");
12353 return error_mark_node
;
12357 error_at (declspecs
->locations
[ds_constexpr
],
12358 "a destructor cannot be %<constexpr%>");
12359 return error_mark_node
;
12362 else if (sfk
== sfk_constructor
&& friendp
&& !ctype
)
12364 error ("expected qualified name in friend declaration "
12365 "for constructor %qD",
12366 id_declarator
->u
.id
.unqualified_name
);
12367 return error_mark_node
;
12369 if (sfk
== sfk_constructor
)
12372 error_at (declspecs
->locations
[ds_concept
],
12373 "a constructor cannot be %<concept%>");
12374 return error_mark_node
;
12378 error_at (declspecs
->locations
[ds_concept
],
12379 "a concept cannot be a member function");
12383 if (TREE_CODE (unqualified_id
) == TEMPLATE_ID_EXPR
)
12385 tree tmpl
= TREE_OPERAND (unqualified_id
, 0);
12386 if (variable_template_p (tmpl
))
12388 error ("specialization of variable template %qD "
12389 "declared as function", tmpl
);
12390 inform (DECL_SOURCE_LOCATION (tmpl
),
12391 "variable template declared here");
12392 return error_mark_node
;
12396 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
12397 function_context
= (ctype
!= NULL_TREE
) ?
12398 decl_function_context (TYPE_MAIN_DECL (ctype
)) : NULL_TREE
;
12399 publicp
= (! friendp
|| ! staticp
)
12400 && function_context
== NULL_TREE
;
12402 decl
= grokfndecl (ctype
, type
,
12403 TREE_CODE (unqualified_id
) != TEMPLATE_ID_EXPR
12404 ? unqualified_id
: dname
,
12409 virtualp
, flags
, memfn_quals
, rqual
, raises
,
12410 friendp
? -1 : 0, friendp
, publicp
,
12411 inlinep
| (2 * constexpr_p
) | (4 * concept_p
),
12412 initialized
== SD_DELETED
, sfk
,
12413 funcdef_flag
, late_return_type_p
,
12414 template_count
, in_namespace
,
12415 attrlist
, declarator
->id_loc
);
12416 decl
= set_virt_specifiers (decl
, virt_specifiers
);
12417 if (decl
== NULL_TREE
)
12418 return error_mark_node
;
12420 /* This clobbers the attrs stored in `decl' from `attrlist'. */
12421 /* The decl and setting of decl_attr is also turned off. */
12422 decl
= build_decl_attribute_variant (decl
, decl_attr
);
12425 /* [class.conv.ctor]
12427 A constructor declared without the function-specifier
12428 explicit that can be called with a single parameter
12429 specifies a conversion from the type of its first
12430 parameter to the type of its class. Such a constructor
12431 is called a converting constructor. */
12432 if (explicitp
== 2)
12433 DECL_NONCONVERTING_P (decl
) = 1;
12435 if (declspecs
->explicit_specifier
)
12436 store_explicit_specifier (decl
, declspecs
->explicit_specifier
);
12438 else if (!staticp
&& !dependent_type_p (type
)
12439 && !COMPLETE_TYPE_P (complete_type (type
))
12440 && (!complete_or_array_type_p (type
)
12441 || initialized
== 0))
12443 if (TREE_CODE (type
) != ARRAY_TYPE
12444 || !COMPLETE_TYPE_P (TREE_TYPE (type
)))
12446 if (unqualified_id
)
12448 error_at (declarator
->id_loc
,
12449 "field %qD has incomplete type %qT",
12450 unqualified_id
, type
);
12451 cxx_incomplete_type_inform (strip_array_types (type
));
12454 error ("name %qT has incomplete type", type
);
12456 type
= error_mark_node
;
12464 if (unqualified_id
&& declarator
)
12465 error_at (declarator
->id_loc
,
12466 "%qE is neither function nor member function; "
12467 "cannot be declared friend", unqualified_id
);
12469 error ("unnamed field is neither function nor member "
12470 "function; cannot be declared friend");
12471 return error_mark_node
;
12478 /* Friends are treated specially. */
12479 if (ctype
== current_class_type
)
12480 ; /* We already issued a permerror. */
12481 else if (decl
&& DECL_NAME (decl
))
12483 if (template_class_depth (current_class_type
) == 0)
12485 decl
= check_explicit_specialization
12486 (unqualified_id
, decl
, template_count
,
12487 2 * funcdef_flag
+ 4);
12488 if (decl
== error_mark_node
)
12489 return error_mark_node
;
12492 decl
= do_friend (ctype
, unqualified_id
, decl
,
12498 return error_mark_node
;
12501 /* Structure field. It may not be a function, except for C++. */
12503 if (decl
== NULL_TREE
)
12507 /* C++ allows static class members. All other work
12508 for this is done by grokfield. */
12509 decl
= build_lang_decl_loc (loc
, VAR_DECL
,
12510 unqualified_id
, type
);
12511 set_linkage_for_static_data_member (decl
);
12513 error_at (declspecs
->locations
[ds_concept
],
12514 "static data member %qE declared %<concept%>",
12516 else if (constexpr_p
&& !initialized
)
12518 error ("%<constexpr%> static data member %qD must have an "
12519 "initializer", decl
);
12520 constexpr_p
= false;
12524 mark_inline_variable (decl
, declspecs
->locations
[ds_inline
]);
12526 if (!DECL_VAR_DECLARED_INLINE_P (decl
)
12527 && !(cxx_dialect
>= cxx17
&& constexpr_p
))
12528 /* Even if there is an in-class initialization, DECL
12529 is considered undefined until an out-of-class
12530 definition is provided, unless this is an inline
12532 DECL_EXTERNAL (decl
) = 1;
12536 CP_DECL_THREAD_LOCAL_P (decl
) = true;
12537 if (!processing_template_decl
)
12538 set_decl_tls_model (decl
, decl_default_tls_model (decl
));
12539 if (declspecs
->gnu_thread_keyword_p
)
12540 SET_DECL_GNU_TLS_P (decl
);
12546 error_at (declspecs
->locations
[ds_concept
],
12547 "non-static data member %qE declared %<concept%>",
12549 else if (constexpr_p
)
12551 error_at (declspecs
->locations
[ds_constexpr
],
12552 "non-static data member %qE declared %<constexpr%>",
12554 constexpr_p
= false;
12556 decl
= build_decl (loc
, FIELD_DECL
, unqualified_id
, type
);
12557 DECL_NONADDRESSABLE_P (decl
) = bitfield
;
12558 if (bitfield
&& !unqualified_id
)
12560 TREE_NO_WARNING (decl
) = 1;
12561 DECL_PADDING_P (decl
) = 1;
12564 if (storage_class
== sc_mutable
)
12566 DECL_MUTABLE_P (decl
) = 1;
12567 storage_class
= sc_none
;
12572 /* An attempt is being made to initialize a non-static
12573 member. This is new in C++11. */
12574 maybe_warn_cpp0x (CPP0X_NSDMI
);
12576 /* If this has been parsed with static storage class, but
12577 errors forced staticp to be cleared, ensure NSDMI is
12579 if (declspecs
->storage_class
== sc_static
)
12580 DECL_INITIAL (decl
) = error_mark_node
;
12584 bad_specifiers (decl
, BSP_FIELD
, virtualp
,
12585 memfn_quals
!= TYPE_UNQUALIFIED
,
12586 staticp
? false : inlinep
, friendp
,
12587 raises
!= NULL_TREE
,
12588 declspecs
->locations
);
12591 else if (TREE_CODE (type
) == FUNCTION_TYPE
12592 || TREE_CODE (type
) == METHOD_TYPE
)
12594 tree original_name
;
12597 if (!unqualified_id
)
12598 return error_mark_node
;
12600 if (TREE_CODE (unqualified_id
) == TEMPLATE_ID_EXPR
)
12601 original_name
= dname
;
12603 original_name
= unqualified_id
;
12604 // FIXME:gcc_assert (original_name == dname);
12606 if (storage_class
== sc_auto
)
12607 error ("storage class %<auto%> invalid for function %qs", name
);
12608 else if (storage_class
== sc_register
)
12609 error ("storage class %<register%> invalid for function %qs", name
);
12612 if (declspecs
->gnu_thread_keyword_p
)
12613 error_at (declspecs
->locations
[ds_thread
],
12614 "storage class %<__thread%> invalid for function %qs",
12617 error_at (declspecs
->locations
[ds_thread
],
12618 "storage class %<thread_local%> invalid for "
12619 "function %qs", name
);
12622 if (virt_specifiers
)
12623 error ("virt-specifiers in %qs not allowed outside a class "
12624 "definition", name
);
12625 /* Function declaration not at top level.
12626 Storage classes other than `extern' are not allowed
12627 and `extern' makes no difference. */
12628 if (! toplevel_bindings_p ()
12629 && (storage_class
== sc_static
12630 || decl_spec_seq_has_spec_p (declspecs
, ds_inline
))
12633 if (storage_class
== sc_static
)
12634 pedwarn (declspecs
->locations
[ds_storage_class
], OPT_Wpedantic
,
12635 "%<static%> specifier invalid for function %qs "
12636 "declared out of global scope", name
);
12638 pedwarn (declspecs
->locations
[ds_inline
], OPT_Wpedantic
,
12639 "%<inline%> specifier invalid for function %qs "
12640 "declared out of global scope", name
);
12643 if (ctype
== NULL_TREE
)
12647 error ("virtual non-class function %qs", name
);
12650 else if (sfk
== sfk_constructor
12651 || sfk
== sfk_destructor
)
12653 error (funcdef_flag
12654 ? G_("%qs defined in a non-class scope")
12655 : G_("%qs declared in a non-class scope"), name
);
12660 /* Record whether the function is public. */
12661 publicp
= (ctype
!= NULL_TREE
12662 || storage_class
!= sc_static
);
12664 decl
= grokfndecl (ctype
, type
, original_name
, parms
, unqualified_id
,
12666 reqs
, virtualp
, flags
, memfn_quals
, rqual
, raises
,
12669 inlinep
| (2 * constexpr_p
) | (4 * concept_p
),
12670 initialized
== SD_DELETED
,
12673 late_return_type_p
,
12674 template_count
, in_namespace
, attrlist
,
12675 declarator
->id_loc
);
12676 if (decl
== NULL_TREE
)
12677 return error_mark_node
;
12679 if (explicitp
== 2)
12680 DECL_NONCONVERTING_P (decl
) = 1;
12683 int invalid_static
= 0;
12685 /* Don't allow a static member function in a class, and forbid
12686 declaring main to be static. */
12687 if (TREE_CODE (type
) == METHOD_TYPE
)
12689 permerror (input_location
, "cannot declare member function %qD to have "
12690 "static linkage", decl
);
12691 invalid_static
= 1;
12693 else if (current_function_decl
)
12695 /* 7.1.1: There can be no static function declarations within a
12697 error_at (declspecs
->locations
[ds_storage_class
],
12698 "cannot declare static function inside another function");
12699 invalid_static
= 1;
12702 if (invalid_static
)
12705 storage_class
= sc_none
;
12711 /* It's a variable. */
12713 /* An uninitialized decl with `extern' is a reference. */
12714 decl
= grokvardecl (type
, dname
, unqualified_id
,
12721 ctype
? ctype
: in_namespace
,
12723 if (decl
== NULL_TREE
)
12724 return error_mark_node
;
12726 bad_specifiers (decl
, BSP_VAR
, virtualp
,
12727 memfn_quals
!= TYPE_UNQUALIFIED
,
12728 inlinep
, friendp
, raises
!= NULL_TREE
,
12729 declspecs
->locations
);
12733 DECL_CONTEXT (decl
) = ctype
;
12736 permerror (declspecs
->locations
[ds_storage_class
],
12737 "%<static%> may not be used when defining "
12738 "(as opposed to declaring) a static data member");
12740 storage_class
= sc_none
;
12742 if (storage_class
== sc_register
&& TREE_STATIC (decl
))
12744 error ("static member %qD declared %<register%>", decl
);
12745 storage_class
= sc_none
;
12747 if (storage_class
== sc_extern
&& pedantic
)
12749 pedwarn (input_location
, OPT_Wpedantic
,
12750 "cannot explicitly declare member %q#D to have "
12751 "extern linkage", decl
);
12752 storage_class
= sc_none
;
12755 else if (constexpr_p
&& DECL_EXTERNAL (decl
))
12757 error ("declaration of %<constexpr%> variable %qD "
12758 "is not a definition", decl
);
12759 constexpr_p
= false;
12763 mark_inline_variable (decl
, declspecs
->locations
[ds_inline
]);
12764 if (innermost_code
== cdk_decomp
)
12766 gcc_assert (declarator
&& declarator
->kind
== cdk_decomp
);
12767 DECL_SOURCE_LOCATION (decl
) = declarator
->id_loc
;
12768 DECL_ARTIFICIAL (decl
) = 1;
12769 fit_decomposition_lang_decl (decl
, NULL_TREE
);
12773 if (VAR_P (decl
) && !initialized
)
12774 if (tree auto_node
= type_uses_auto (type
))
12775 if (!CLASS_PLACEHOLDER_TEMPLATE (auto_node
))
12777 location_t loc
= declspecs
->locations
[ds_type_spec
];
12778 error_at (loc
, "declaration of %q#D has no initializer", decl
);
12779 TREE_TYPE (decl
) = error_mark_node
;
12782 if (storage_class
== sc_extern
&& initialized
&& !funcdef_flag
)
12784 if (toplevel_bindings_p ())
12786 /* It's common practice (and completely valid) to have a const
12787 be initialized and declared extern. */
12788 if (!(type_quals
& TYPE_QUAL_CONST
))
12789 warning (0, "%qs initialized and declared %<extern%>", name
);
12793 error ("%qs has both %<extern%> and initializer", name
);
12794 return error_mark_node
;
12798 /* Record `register' declaration for warnings on &
12799 and in case doing stupid register allocation. */
12801 if (storage_class
== sc_register
)
12803 DECL_REGISTER (decl
) = 1;
12804 /* Warn about register storage specifiers on PARM_DECLs. */
12805 if (TREE_CODE (decl
) == PARM_DECL
)
12807 if (cxx_dialect
>= cxx17
)
12808 pedwarn (DECL_SOURCE_LOCATION (decl
), OPT_Wregister
,
12809 "ISO C++17 does not allow %<register%> storage "
12810 "class specifier");
12812 warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wregister
,
12813 "%<register%> storage class specifier used");
12816 else if (storage_class
== sc_extern
)
12817 DECL_THIS_EXTERN (decl
) = 1;
12818 else if (storage_class
== sc_static
)
12819 DECL_THIS_STATIC (decl
) = 1;
12821 /* Set constexpr flag on vars (functions got it in grokfndecl). */
12822 if (constexpr_p
&& VAR_P (decl
))
12823 DECL_DECLARED_CONSTEXPR_P (decl
) = true;
12825 /* Record constancy and volatility on the DECL itself . There's
12826 no need to do this when processing a template; we'll do this
12827 for the instantiated declaration based on the type of DECL. */
12828 if (!processing_template_decl
)
12829 cp_apply_type_quals_to_decl (type_quals
, decl
);
12835 /* Subroutine of start_function. Ensure that each of the parameter
12836 types (as listed in PARMS) is complete, as is required for a
12837 function definition. */
12840 require_complete_types_for_parms (tree parms
)
12842 for (; parms
; parms
= DECL_CHAIN (parms
))
12844 if (dependent_type_p (TREE_TYPE (parms
)))
12846 if (!VOID_TYPE_P (TREE_TYPE (parms
))
12847 && complete_type_or_else (TREE_TYPE (parms
), parms
))
12849 relayout_decl (parms
);
12850 DECL_ARG_TYPE (parms
) = type_passed_as (TREE_TYPE (parms
));
12852 maybe_warn_parm_abi (TREE_TYPE (parms
),
12853 DECL_SOURCE_LOCATION (parms
));
12856 /* grokparms or complete_type_or_else will have already issued
12858 TREE_TYPE (parms
) = error_mark_node
;
12862 /* Returns nonzero if T is a local variable. */
12865 local_variable_p (const_tree t
)
12868 /* A VAR_DECL with a context that is a _TYPE is a static data
12870 && !TYPE_P (CP_DECL_CONTEXT (t
))
12871 /* Any other non-local variable must be at namespace scope. */
12872 && !DECL_NAMESPACE_SCOPE_P (t
))
12873 || (TREE_CODE (t
) == PARM_DECL
))
12879 /* Like local_variable_p, but suitable for use as a tree-walking
12883 local_variable_p_walkfn (tree
*tp
, int *walk_subtrees
,
12886 if (local_variable_p (*tp
)
12887 && (!DECL_ARTIFICIAL (*tp
) || DECL_NAME (*tp
) == this_identifier
))
12889 else if (TYPE_P (*tp
))
12890 *walk_subtrees
= 0;
12895 /* Check that ARG, which is a default-argument expression for a
12896 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
12897 something goes wrong. DECL may also be a _TYPE node, rather than a
12898 DECL, if there is no DECL available. */
12901 check_default_argument (tree decl
, tree arg
, tsubst_flags_t complain
)
12906 if (TREE_CODE (arg
) == DEFAULT_ARG
)
12907 /* We get a DEFAULT_ARG when looking at an in-class declaration
12908 with a default argument. Ignore the argument for now; we'll
12909 deal with it after the class is complete. */
12918 decl_type
= TREE_TYPE (decl
);
12920 if (arg
== error_mark_node
12921 || decl
== error_mark_node
12922 || TREE_TYPE (arg
) == error_mark_node
12923 || decl_type
== error_mark_node
)
12924 /* Something already went wrong. There's no need to check
12926 return error_mark_node
;
12928 /* [dcl.fct.default]
12930 A default argument expression is implicitly converted to the
12932 ++cp_unevaluated_operand
;
12933 /* Avoid digest_init clobbering the initializer. */
12934 tree carg
= BRACE_ENCLOSED_INITIALIZER_P (arg
) ? unshare_expr (arg
): arg
;
12935 perform_implicit_conversion_flags (decl_type
, carg
, complain
,
12937 --cp_unevaluated_operand
;
12939 /* Avoid redundant -Wzero-as-null-pointer-constant warnings at
12941 if (TYPE_PTR_OR_PTRMEM_P (decl_type
)
12942 && null_ptr_cst_p (arg
))
12943 return nullptr_node
;
12945 /* [dcl.fct.default]
12947 Local variables shall not be used in default argument
12950 The keyword `this' shall not be used in a default argument of a
12951 member function. */
12952 var
= cp_walk_tree_without_duplicates (&arg
, local_variable_p_walkfn
, NULL
);
12955 if (complain
& tf_warning_or_error
)
12957 if (DECL_NAME (var
) == this_identifier
)
12958 permerror (input_location
, "default argument %qE uses %qD",
12961 error ("default argument %qE uses local variable %qD", arg
, var
);
12963 return error_mark_node
;
12970 /* Returns a deprecated type used within TYPE, or NULL_TREE if none. */
12973 type_is_deprecated (tree type
)
12975 enum tree_code code
;
12976 if (TREE_DEPRECATED (type
))
12978 if (TYPE_NAME (type
))
12980 if (TREE_DEPRECATED (TYPE_NAME (type
)))
12986 /* Do warn about using typedefs to a deprecated class. */
12987 if (OVERLOAD_TYPE_P (type
) && type
!= TYPE_MAIN_VARIANT (type
))
12988 return type_is_deprecated (TYPE_MAIN_VARIANT (type
));
12990 code
= TREE_CODE (type
);
12992 if (code
== POINTER_TYPE
|| code
== REFERENCE_TYPE
12993 || code
== OFFSET_TYPE
|| code
== FUNCTION_TYPE
12994 || code
== METHOD_TYPE
|| code
== ARRAY_TYPE
)
12995 return type_is_deprecated (TREE_TYPE (type
));
12997 if (TYPE_PTRMEMFUNC_P (type
))
12998 return type_is_deprecated
12999 (TREE_TYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (type
))));
13004 /* Decode the list of parameter types for a function type.
13005 Given the list of things declared inside the parens,
13006 return a list of types.
13008 If this parameter does not end with an ellipsis, we append
13011 *PARMS is set to the chain of PARM_DECLs created. */
13014 grokparms (tree parmlist
, tree
*parms
)
13016 tree result
= NULL_TREE
;
13017 tree decls
= NULL_TREE
;
13021 for (parm
= parmlist
; parm
!= NULL_TREE
; parm
= TREE_CHAIN (parm
))
13023 tree type
= NULL_TREE
;
13024 tree init
= TREE_PURPOSE (parm
);
13025 tree decl
= TREE_VALUE (parm
);
13027 if (parm
== void_list_node
)
13030 if (! decl
|| TREE_TYPE (decl
) == error_mark_node
)
13033 type
= TREE_TYPE (decl
);
13034 if (VOID_TYPE_P (type
))
13036 if (same_type_p (type
, void_type_node
)
13038 && !DECL_NAME (decl
) && !result
13039 && TREE_CHAIN (parm
) == void_list_node
)
13040 /* DR 577: A parameter list consisting of a single
13041 unnamed parameter of non-dependent type 'void'. */
13043 else if (cv_qualified_p (type
))
13044 error_at (DECL_SOURCE_LOCATION (decl
),
13045 "invalid use of cv-qualified type %qT in "
13046 "parameter declaration", type
);
13048 error_at (DECL_SOURCE_LOCATION (decl
),
13049 "invalid use of type %<void%> in parameter "
13051 /* It's not a good idea to actually create parameters of
13052 type `void'; other parts of the compiler assume that a
13053 void type terminates the parameter list. */
13054 type
= error_mark_node
;
13055 TREE_TYPE (decl
) = error_mark_node
;
13058 if (type
!= error_mark_node
)
13060 if (deprecated_state
!= DEPRECATED_SUPPRESS
)
13062 tree deptype
= type_is_deprecated (type
);
13064 cp_warn_deprecated_use (deptype
);
13067 /* Top-level qualifiers on the parameters are
13068 ignored for function types. */
13069 type
= cp_build_qualified_type (type
, 0);
13070 if (TREE_CODE (type
) == METHOD_TYPE
)
13072 error ("parameter %qD invalidly declared method type", decl
);
13073 type
= build_pointer_type (type
);
13074 TREE_TYPE (decl
) = type
;
13076 else if (abstract_virtuals_error (decl
, type
))
13077 any_error
= 1; /* Seems like a good idea. */
13078 else if (cxx_dialect
< cxx17
&& INDIRECT_TYPE_P (type
))
13080 /* Before C++17 DR 393:
13081 [dcl.fct]/6, parameter types cannot contain pointers
13082 (references) to arrays of unknown bound. */
13083 tree t
= TREE_TYPE (type
);
13084 int ptr
= TYPE_PTR_P (type
);
13088 if (TYPE_PTR_P (t
))
13090 else if (TREE_CODE (t
) != ARRAY_TYPE
)
13092 else if (!TYPE_DOMAIN (t
))
13096 if (TREE_CODE (t
) == ARRAY_TYPE
)
13097 pedwarn (DECL_SOURCE_LOCATION (decl
), OPT_Wpedantic
,
13099 ? G_("parameter %qD includes pointer to array of "
13100 "unknown bound %qT")
13101 : G_("parameter %qD includes reference to array of "
13102 "unknown bound %qT"),
13108 else if (init
&& !processing_template_decl
)
13109 init
= check_default_argument (decl
, init
, tf_warning_or_error
);
13112 DECL_CHAIN (decl
) = decls
;
13114 result
= tree_cons (init
, type
, result
);
13116 decls
= nreverse (decls
);
13117 result
= nreverse (result
);
13119 result
= chainon (result
, void_list_node
);
13126 /* D is a constructor or overloaded `operator='.
13128 Let T be the class in which D is declared. Then, this function
13131 -1 if D's is an ill-formed constructor or copy assignment operator
13132 whose first parameter is of type `T'.
13133 0 if D is not a copy constructor or copy assignment
13135 1 if D is a copy constructor or copy assignment operator whose
13136 first parameter is a reference to non-const qualified T.
13137 2 if D is a copy constructor or copy assignment operator whose
13138 first parameter is a reference to const qualified T.
13140 This function can be used as a predicate. Positive values indicate
13141 a copy constructor and nonzero values indicate a copy assignment
13145 copy_fn_p (const_tree d
)
13151 gcc_assert (DECL_FUNCTION_MEMBER_P (d
));
13153 if (TREE_CODE (d
) == TEMPLATE_DECL
13154 || (DECL_TEMPLATE_INFO (d
)
13155 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d
))))
13156 /* Instantiations of template member functions are never copy
13157 functions. Note that member functions of templated classes are
13158 represented as template functions internally, and we must
13159 accept those as copy functions. */
13162 args
= FUNCTION_FIRST_USER_PARMTYPE (d
);
13166 arg_type
= TREE_VALUE (args
);
13167 if (arg_type
== error_mark_node
)
13170 if (TYPE_MAIN_VARIANT (arg_type
) == DECL_CONTEXT (d
))
13172 /* Pass by value copy assignment operator. */
13175 else if (TYPE_REF_P (arg_type
)
13176 && !TYPE_REF_IS_RVALUE (arg_type
)
13177 && TYPE_MAIN_VARIANT (TREE_TYPE (arg_type
)) == DECL_CONTEXT (d
))
13179 if (CP_TYPE_CONST_P (TREE_TYPE (arg_type
)))
13185 args
= TREE_CHAIN (args
);
13187 if (args
&& args
!= void_list_node
&& !TREE_PURPOSE (args
))
13188 /* There are more non-optional args. */
13194 /* D is a constructor or overloaded `operator='.
13196 Let T be the class in which D is declared. Then, this function
13197 returns true when D is a move constructor or move assignment
13198 operator, false otherwise. */
13201 move_fn_p (const_tree d
)
13203 gcc_assert (DECL_FUNCTION_MEMBER_P (d
));
13205 if (cxx_dialect
== cxx98
)
13206 /* There are no move constructors if we are in C++98 mode. */
13209 if (TREE_CODE (d
) == TEMPLATE_DECL
13210 || (DECL_TEMPLATE_INFO (d
)
13211 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d
))))
13212 /* Instantiations of template member functions are never move
13213 functions. Note that member functions of templated classes are
13214 represented as template functions internally, and we must
13215 accept those as move functions. */
13218 return move_signature_fn_p (d
);
13221 /* D is a constructor or overloaded `operator='.
13223 Then, this function returns true when D has the same signature as a move
13224 constructor or move assignment operator (because either it is such a
13225 ctor/op= or it is a template specialization with the same signature),
13226 false otherwise. */
13229 move_signature_fn_p (const_tree d
)
13233 bool result
= false;
13235 args
= FUNCTION_FIRST_USER_PARMTYPE (d
);
13239 arg_type
= TREE_VALUE (args
);
13240 if (arg_type
== error_mark_node
)
13243 if (TYPE_REF_P (arg_type
)
13244 && TYPE_REF_IS_RVALUE (arg_type
)
13245 && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (arg_type
)),
13249 args
= TREE_CHAIN (args
);
13251 if (args
&& args
!= void_list_node
&& !TREE_PURPOSE (args
))
13252 /* There are more non-optional args. */
13258 /* Remember any special properties of member function DECL. */
13261 grok_special_member_properties (tree decl
)
13265 if (!DECL_NONSTATIC_MEMBER_FUNCTION_P (decl
))
13268 class_type
= DECL_CONTEXT (decl
);
13269 if (IDENTIFIER_CTOR_P (DECL_NAME (decl
)))
13271 int ctor
= copy_fn_p (decl
);
13273 if (!DECL_ARTIFICIAL (decl
))
13274 TYPE_HAS_USER_CONSTRUCTOR (class_type
) = 1;
13280 A non-template constructor for class X is a copy
13281 constructor if its first parameter is of type X&, const
13282 X&, volatile X& or const volatile X&, and either there
13283 are no other parameters or else all other parameters have
13284 default arguments. */
13285 TYPE_HAS_COPY_CTOR (class_type
) = 1;
13286 if (user_provided_p (decl
))
13287 TYPE_HAS_COMPLEX_COPY_CTOR (class_type
) = 1;
13289 TYPE_HAS_CONST_COPY_CTOR (class_type
) = 1;
13291 else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl
)))
13292 TYPE_HAS_DEFAULT_CONSTRUCTOR (class_type
) = 1;
13293 else if (move_fn_p (decl
) && user_provided_p (decl
))
13294 TYPE_HAS_COMPLEX_MOVE_CTOR (class_type
) = 1;
13295 else if (is_list_ctor (decl
))
13296 TYPE_HAS_LIST_CTOR (class_type
) = 1;
13298 if (DECL_DECLARED_CONSTEXPR_P (decl
)
13299 && !ctor
&& !move_fn_p (decl
))
13300 TYPE_HAS_CONSTEXPR_CTOR (class_type
) = 1;
13302 else if (DECL_NAME (decl
) == assign_op_identifier
)
13306 A non-template assignment operator for class X is a copy
13307 assignment operator if its parameter is of type X, X&, const
13308 X&, volatile X& or const volatile X&. */
13310 int assop
= copy_fn_p (decl
);
13314 TYPE_HAS_COPY_ASSIGN (class_type
) = 1;
13315 if (user_provided_p (decl
))
13316 TYPE_HAS_COMPLEX_COPY_ASSIGN (class_type
) = 1;
13318 TYPE_HAS_CONST_COPY_ASSIGN (class_type
) = 1;
13320 else if (move_fn_p (decl
) && user_provided_p (decl
))
13321 TYPE_HAS_COMPLEX_MOVE_ASSIGN (class_type
) = 1;
13323 else if (IDENTIFIER_CONV_OP_P (DECL_NAME (decl
)))
13324 TYPE_HAS_CONVERSION (class_type
) = true;
13326 /* Destructors are handled in check_methods. */
13329 /* Check a constructor DECL has the correct form. Complains
13330 if the class has a constructor of the form X(X). */
13333 grok_ctor_properties (const_tree ctype
, const_tree decl
)
13335 int ctor_parm
= copy_fn_p (decl
);
13341 A declaration of a constructor for a class X is ill-formed if
13342 its first parameter is of type (optionally cv-qualified) X
13343 and either there are no other parameters or else all other
13344 parameters have default arguments.
13346 We *don't* complain about member template instantiations that
13347 have this form, though; they can occur as we try to decide
13348 what constructor to use during overload resolution. Since
13349 overload resolution will never prefer such a constructor to
13350 the non-template copy constructor (which is either explicitly
13351 or implicitly defined), there's no need to worry about their
13352 existence. Theoretically, they should never even be
13353 instantiated, but that's hard to forestall. */
13354 error ("invalid constructor; you probably meant %<%T (const %T&)%>",
13362 /* DECL is a declaration for an overloaded or conversion operator. If
13363 COMPLAIN is true, errors are issued for invalid declarations. */
13366 grok_op_properties (tree decl
, bool complain
)
13368 tree argtypes
= TYPE_ARG_TYPES (TREE_TYPE (decl
));
13369 bool methodp
= TREE_CODE (TREE_TYPE (decl
)) == METHOD_TYPE
;
13370 tree name
= DECL_NAME (decl
);
13371 location_t loc
= DECL_SOURCE_LOCATION (decl
);
13373 tree class_type
= DECL_CONTEXT (decl
);
13374 if (class_type
&& !CLASS_TYPE_P (class_type
))
13375 class_type
= NULL_TREE
;
13377 tree_code operator_code
;
13379 if (IDENTIFIER_CONV_OP_P (name
))
13381 /* Conversion operators are TYPE_EXPR for the purposes of this
13383 operator_code
= TYPE_EXPR
;
13384 op_flags
= OVL_OP_FLAG_UNARY
;
13388 const ovl_op_info_t
*ovl_op
= IDENTIFIER_OVL_OP_INFO (name
);
13390 operator_code
= ovl_op
->tree_code
;
13391 op_flags
= ovl_op
->flags
;
13392 gcc_checking_assert (operator_code
!= ERROR_MARK
);
13393 DECL_OVERLOADED_OPERATOR_CODE_RAW (decl
) = ovl_op
->ovl_op_code
;
13396 if (op_flags
& OVL_OP_FLAG_ALLOC
)
13398 /* operator new and operator delete are quite special. */
13402 case OVL_OP_FLAG_ALLOC
:
13403 TYPE_HAS_NEW_OPERATOR (class_type
) = 1;
13406 case OVL_OP_FLAG_ALLOC
| OVL_OP_FLAG_DELETE
:
13407 TYPE_GETS_DELETE (class_type
) |= 1;
13410 case OVL_OP_FLAG_ALLOC
| OVL_OP_FLAG_VEC
:
13411 TYPE_HAS_ARRAY_NEW_OPERATOR (class_type
) = 1;
13414 case OVL_OP_FLAG_ALLOC
| OVL_OP_FLAG_DELETE
| OVL_OP_FLAG_VEC
:
13415 TYPE_GETS_DELETE (class_type
) |= 2;
13419 gcc_unreachable ();
13422 /* [basic.std.dynamic.allocation]/1:
13424 A program is ill-formed if an allocation function is declared
13425 in a namespace scope other than global scope or declared
13426 static in global scope.
13428 The same also holds true for deallocation functions. */
13429 if (DECL_NAMESPACE_SCOPE_P (decl
))
13431 if (CP_DECL_CONTEXT (decl
) != global_namespace
)
13433 error_at (loc
, "%qD may not be declared within a namespace",
13438 if (!TREE_PUBLIC (decl
))
13440 error_at (loc
, "%qD may not be declared as static", decl
);
13445 if (op_flags
& OVL_OP_FLAG_DELETE
)
13446 coerce_delete_type (decl
, loc
);
13449 DECL_IS_OPERATOR_NEW (decl
) = 1;
13450 TREE_TYPE (decl
) = coerce_new_type (TREE_TYPE (decl
), loc
);
13456 /* An operator function must either be a non-static member function
13457 or have at least one parameter of a class, a reference to a class,
13458 an enumeration, or a reference to an enumeration. 13.4.0.6 */
13459 if (! methodp
|| DECL_STATIC_FUNCTION_P (decl
))
13461 if (operator_code
== TYPE_EXPR
13462 || operator_code
== CALL_EXPR
13463 || operator_code
== COMPONENT_REF
13464 || operator_code
== ARRAY_REF
13465 || operator_code
== NOP_EXPR
)
13467 error_at (loc
, "%qD must be a nonstatic member function", decl
);
13471 if (DECL_STATIC_FUNCTION_P (decl
))
13473 error_at (loc
, "%qD must be either a non-static member "
13474 "function or a non-member function", decl
);
13478 for (tree arg
= argtypes
; ; arg
= TREE_CHAIN (arg
))
13480 if (!arg
|| arg
== void_list_node
)
13483 error_at(loc
, "%qD must have an argument of class or "
13484 "enumerated type", decl
);
13488 tree type
= non_reference (TREE_VALUE (arg
));
13489 if (type
== error_mark_node
)
13492 /* MAYBE_CLASS_TYPE_P, rather than CLASS_TYPE_P, is used
13493 because these checks are performed even on template
13495 if (MAYBE_CLASS_TYPE_P (type
)
13496 || TREE_CODE (type
) == ENUMERAL_TYPE
)
13501 if (operator_code
== CALL_EXPR
)
13502 /* There are no further restrictions on the arguments to an overloaded
13506 if (operator_code
== COND_EXPR
)
13509 error_at (loc
, "ISO C++ prohibits overloading operator ?:");
13513 /* Count the number of arguments and check for ellipsis. */
13515 for (tree arg
= argtypes
; arg
!= void_list_node
; arg
= TREE_CHAIN (arg
))
13520 error_at (loc
, "%qD must not have variable number of arguments",
13527 /* Verify correct number of arguments. */
13530 case OVL_OP_FLAG_AMBIARY
:
13533 /* We have a unary instance of an ambi-ary op. Remap to the
13535 unsigned alt
= ovl_op_alternate
[ovl_op_mapping
[operator_code
]];
13536 const ovl_op_info_t
*ovl_op
= &ovl_op_info
[false][alt
];
13537 gcc_checking_assert (ovl_op
->flags
== OVL_OP_FLAG_UNARY
);
13538 operator_code
= ovl_op
->tree_code
;
13539 DECL_OVERLOADED_OPERATOR_CODE_RAW (decl
) = ovl_op
->ovl_op_code
;
13541 else if (arity
!= 2)
13543 /* This was an ambiguous operator but is invalid. */
13546 ? G_("%qD must have either zero or one argument")
13547 : G_("%qD must have either one or two arguments"), decl
);
13550 else if ((operator_code
== POSTINCREMENT_EXPR
13551 || operator_code
== POSTDECREMENT_EXPR
)
13552 && ! processing_template_decl
13553 /* x++ and x--'s second argument must be an int. */
13554 && ! same_type_p (TREE_VALUE (TREE_CHAIN (argtypes
)),
13555 integer_type_node
))
13559 ? G_("postfix %qD must have %<int%> as its argument")
13560 : G_("postfix %qD must have %<int%> as its second argument"),
13566 case OVL_OP_FLAG_UNARY
:
13571 ? G_("%qD must have no arguments")
13572 : G_("%qD must have exactly one argument"), decl
);
13577 case OVL_OP_FLAG_BINARY
:
13582 ? G_("%qD must have exactly one argument")
13583 : G_("%qD must have exactly two arguments"), decl
);
13589 gcc_unreachable ();
13592 /* There can be no default arguments. */
13593 for (tree arg
= argtypes
; arg
!= void_list_node
; arg
= TREE_CHAIN (arg
))
13594 if (TREE_PURPOSE (arg
))
13596 TREE_PURPOSE (arg
) = NULL_TREE
;
13597 error_at (loc
, "%qD cannot have default arguments", decl
);
13601 /* At this point the declaration is well-formed. It may not be
13602 sensible though. */
13604 /* Check member function warnings only on the in-class declaration.
13605 There's no point warning on an out-of-class definition. */
13606 if (class_type
&& class_type
!= current_class_type
)
13609 /* Warn about conversion operators that will never be used. */
13610 if (IDENTIFIER_CONV_OP_P (name
)
13611 && ! DECL_TEMPLATE_INFO (decl
)
13612 && warn_class_conversion
)
13614 tree t
= TREE_TYPE (name
);
13615 int ref
= TYPE_REF_P (t
);
13618 t
= TYPE_MAIN_VARIANT (TREE_TYPE (t
));
13620 if (VOID_TYPE_P (t
))
13621 warning_at (loc
, OPT_Wclass_conversion
, "converting %qT to %<void%> "
13622 "will never use a type conversion operator", class_type
);
13623 else if (class_type
)
13625 if (same_type_ignoring_top_level_qualifiers_p (t
, class_type
))
13626 warning_at (loc
, OPT_Wclass_conversion
,
13628 ? G_("converting %qT to a reference to the same type "
13629 "will never use a type conversion operator")
13630 : G_("converting %qT to the same type "
13631 "will never use a type conversion operator"),
13633 /* Don't force t to be complete here. */
13634 else if (MAYBE_CLASS_TYPE_P (t
)
13635 && COMPLETE_TYPE_P (t
)
13636 && DERIVED_FROM_P (t
, class_type
))
13637 warning_at (loc
, OPT_Wclass_conversion
,
13639 ? G_("converting %qT to a reference to a base class "
13640 "%qT will never use a type conversion operator")
13641 : G_("converting %qT to a base class %qT "
13642 "will never use a type conversion operator"),
13650 /* Effective C++ rules below. */
13652 /* More Effective C++ rule 7. */
13653 if (operator_code
== TRUTH_ANDIF_EXPR
13654 || operator_code
== TRUTH_ORIF_EXPR
13655 || operator_code
== COMPOUND_EXPR
)
13656 warning_at (loc
, OPT_Weffc__
,
13657 "user-defined %qD always evaluates both arguments", decl
);
13659 /* More Effective C++ rule 6. */
13660 if (operator_code
== POSTINCREMENT_EXPR
13661 || operator_code
== POSTDECREMENT_EXPR
13662 || operator_code
== PREINCREMENT_EXPR
13663 || operator_code
== PREDECREMENT_EXPR
)
13665 tree arg
= TREE_VALUE (argtypes
);
13666 tree ret
= TREE_TYPE (TREE_TYPE (decl
));
13667 if (methodp
|| TYPE_REF_P (arg
))
13668 arg
= TREE_TYPE (arg
);
13669 arg
= TYPE_MAIN_VARIANT (arg
);
13671 if (operator_code
== PREINCREMENT_EXPR
13672 || operator_code
== PREDECREMENT_EXPR
)
13674 if (!TYPE_REF_P (ret
)
13675 || !same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (ret
)), arg
))
13676 warning_at (loc
, OPT_Weffc__
, "prefix %qD should return %qT", decl
,
13677 build_reference_type (arg
));
13681 if (!same_type_p (TYPE_MAIN_VARIANT (ret
), arg
))
13682 warning_at (loc
, OPT_Weffc__
,
13683 "postfix %qD should return %qT", decl
, arg
);
13687 /* Effective C++ rule 23. */
13688 if (!DECL_ASSIGNMENT_OPERATOR_P (decl
)
13689 && (operator_code
== PLUS_EXPR
13690 || operator_code
== MINUS_EXPR
13691 || operator_code
== TRUNC_DIV_EXPR
13692 || operator_code
== MULT_EXPR
13693 || operator_code
== TRUNC_MOD_EXPR
)
13694 && TYPE_REF_P (TREE_TYPE (TREE_TYPE (decl
))))
13695 warning_at (loc
, OPT_Weffc__
, "%qD should return by value", decl
);
13700 /* Return a string giving the keyword associate with CODE. */
13702 static const char *
13703 tag_name (enum tag_types code
)
13715 case typename_type
:
13718 gcc_unreachable ();
13722 /* Name lookup in an elaborated-type-specifier (after the keyword
13723 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
13724 elaborated-type-specifier is invalid, issue a diagnostic and return
13725 error_mark_node; otherwise, return the *_TYPE to which it referred.
13726 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
13729 check_elaborated_type_specifier (enum tag_types tag_code
,
13731 bool allow_template_p
)
13737 struct S { struct S *p; };
13739 name lookup will find the TYPE_DECL for the implicit "S::S"
13740 typedef. Adjust for that here. */
13741 if (DECL_SELF_REFERENCE_P (decl
))
13742 decl
= TYPE_NAME (TREE_TYPE (decl
));
13744 type
= TREE_TYPE (decl
);
13746 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
13747 is false for this case as well. */
13748 if (TREE_CODE (type
) == TEMPLATE_TYPE_PARM
)
13750 error ("using template type parameter %qT after %qs",
13751 type
, tag_name (tag_code
));
13752 return error_mark_node
;
13754 /* Accept template template parameters. */
13755 else if (allow_template_p
13756 && (TREE_CODE (type
) == BOUND_TEMPLATE_TEMPLATE_PARM
13757 || TREE_CODE (type
) == TEMPLATE_TEMPLATE_PARM
))
13761 If the identifier resolves to a typedef-name or the
13762 simple-template-id resolves to an alias template
13763 specialization, the elaborated-type-specifier is ill-formed.
13765 In other words, the only legitimate declaration to use in the
13766 elaborated type specifier is the implicit typedef created when
13767 the type is declared. */
13768 else if (!DECL_IMPLICIT_TYPEDEF_P (decl
)
13769 && !DECL_SELF_REFERENCE_P (decl
)
13770 && tag_code
!= typename_type
)
13772 if (alias_template_specialization_p (type
))
13773 error ("using alias template specialization %qT after %qs",
13774 type
, tag_name (tag_code
));
13776 error ("using typedef-name %qD after %qs", decl
, tag_name (tag_code
));
13777 inform (DECL_SOURCE_LOCATION (decl
),
13778 "%qD has a previous declaration here", decl
);
13779 return error_mark_node
;
13781 else if (TREE_CODE (type
) != RECORD_TYPE
13782 && TREE_CODE (type
) != UNION_TYPE
13783 && tag_code
!= enum_type
13784 && tag_code
!= typename_type
)
13786 error ("%qT referred to as %qs", type
, tag_name (tag_code
));
13787 inform (location_of (type
), "%qT has a previous declaration here", type
);
13788 return error_mark_node
;
13790 else if (TREE_CODE (type
) != ENUMERAL_TYPE
13791 && tag_code
== enum_type
)
13793 error ("%qT referred to as enum", type
);
13794 inform (location_of (type
), "%qT has a previous declaration here", type
);
13795 return error_mark_node
;
13797 else if (!allow_template_p
13798 && TREE_CODE (type
) == RECORD_TYPE
13799 && CLASSTYPE_IS_TEMPLATE (type
))
13801 /* If a class template appears as elaborated type specifier
13802 without a template header such as:
13804 template <class T> class C {};
13805 void f(class C); // No template header here
13807 then the required template argument is missing. */
13808 error ("template argument required for %<%s %T%>",
13809 tag_name (tag_code
),
13810 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type
)));
13811 return error_mark_node
;
13817 /* Lookup NAME in elaborate type specifier in scope according to
13818 SCOPE and issue diagnostics if necessary.
13819 Return *_TYPE node upon success, NULL_TREE when the NAME is not
13820 found, and ERROR_MARK_NODE for type error. */
13823 lookup_and_check_tag (enum tag_types tag_code
, tree name
,
13824 tag_scope scope
, bool template_header_p
)
13828 if (scope
== ts_global
)
13830 /* First try ordinary name lookup, ignoring hidden class name
13831 injected via friend declaration. */
13832 decl
= lookup_name_prefer_type (name
, 2);
13833 decl
= strip_using_decl (decl
);
13834 /* If that fails, the name will be placed in the smallest
13835 non-class, non-function-prototype scope according to 3.3.1/5.
13836 We may already have a hidden name declared as friend in this
13837 scope. So lookup again but not ignoring hidden names.
13838 If we find one, that name will be made visible rather than
13839 creating a new tag. */
13841 decl
= lookup_type_scope (name
, ts_within_enclosing_non_class
);
13844 decl
= lookup_type_scope (name
, scope
);
13847 && (DECL_CLASS_TEMPLATE_P (decl
)
13848 /* If scope is ts_current we're defining a class, so ignore a
13849 template template parameter. */
13850 || (scope
!= ts_current
13851 && DECL_TEMPLATE_TEMPLATE_PARM_P (decl
))))
13852 decl
= DECL_TEMPLATE_RESULT (decl
);
13854 if (decl
&& TREE_CODE (decl
) == TYPE_DECL
)
13856 /* Look for invalid nested type:
13860 if (scope
== ts_current
&& DECL_SELF_REFERENCE_P (decl
))
13862 error ("%qD has the same name as the class in which it is "
13865 return error_mark_node
;
13868 /* Two cases we need to consider when deciding if a class
13869 template is allowed as an elaborated type specifier:
13870 1. It is a self reference to its own class.
13871 2. It comes with a template header.
13875 template <class T> class C {
13876 class C *c1; // DECL_SELF_REFERENCE_P is true
13879 template <class U> class C; // template_header_p is true
13880 template <class T> class C<T>::D {
13881 class C *c2; // DECL_SELF_REFERENCE_P is true
13884 t
= check_elaborated_type_specifier (tag_code
,
13887 | DECL_SELF_REFERENCE_P (decl
));
13888 if (template_header_p
&& t
&& CLASS_TYPE_P (t
)
13889 && (!CLASSTYPE_TEMPLATE_INFO (t
)
13890 || (!PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (t
)))))
13892 error ("%qT is not a template", t
);
13893 inform (location_of (t
), "previous declaration here");
13894 if (TYPE_CLASS_SCOPE_P (t
)
13895 && CLASSTYPE_TEMPLATE_INFO (TYPE_CONTEXT (t
)))
13896 inform (input_location
,
13897 "perhaps you want to explicitly add %<%T::%>",
13899 t
= error_mark_node
;
13904 else if (decl
&& TREE_CODE (decl
) == TREE_LIST
)
13906 error ("reference to %qD is ambiguous", name
);
13907 print_candidates (decl
);
13908 return error_mark_node
;
13914 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
13915 Define the tag as a forward-reference if it is not defined.
13917 If a declaration is given, process it here, and report an error if
13918 multiple declarations are not identical.
13920 SCOPE is TS_CURRENT when this is also a definition. Only look in
13921 the current frame for the name (since C++ allows new names in any
13922 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
13923 declaration. Only look beginning from the current scope outward up
13924 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
13926 TEMPLATE_HEADER_P is true when this declaration is preceded by
13927 a set of template parameters. */
13930 xref_tag_1 (enum tag_types tag_code
, tree name
,
13931 tag_scope scope
, bool template_header_p
)
13933 enum tree_code code
;
13934 tree context
= NULL_TREE
;
13936 gcc_assert (identifier_p (name
));
13942 code
= RECORD_TYPE
;
13948 code
= ENUMERAL_TYPE
;
13951 gcc_unreachable ();
13954 /* In case of anonymous name, xref_tag is only called to
13955 make type node and push name. Name lookup is not required. */
13956 tree t
= NULL_TREE
;
13957 if (scope
!= ts_lambda
&& !anon_aggrname_p (name
))
13958 t
= lookup_and_check_tag (tag_code
, name
, scope
, template_header_p
);
13960 if (t
== error_mark_node
)
13961 return error_mark_node
;
13963 if (scope
!= ts_current
&& t
&& current_class_type
13964 && template_class_depth (current_class_type
)
13965 && template_header_p
)
13967 if (TREE_CODE (t
) == TEMPLATE_TEMPLATE_PARM
)
13970 /* Since SCOPE is not TS_CURRENT, we are not looking at a
13971 definition of this tag. Since, in addition, we are currently
13972 processing a (member) template declaration of a template
13973 class, we must be very careful; consider:
13975 template <class X> struct S1
13977 template <class U> struct S2
13979 template <class V> friend struct S1;
13982 Here, the S2::S1 declaration should not be confused with the
13983 outer declaration. In particular, the inner version should
13984 have a template parameter of level 2, not level 1.
13986 On the other hand, when presented with:
13988 template <class T> struct S1
13990 template <class U> struct S2 {};
13991 template <class U> friend struct S2;
13994 the friend must find S1::S2 eventually. We accomplish this
13995 by making sure that the new type we create to represent this
13996 declaration has the right TYPE_CONTEXT. */
13997 context
= TYPE_CONTEXT (t
);
14003 /* If no such tag is yet defined, create a forward-reference node
14004 and record it as the "definition".
14005 When a real declaration of this type is found,
14006 the forward-reference will be altered into a real type. */
14007 if (code
== ENUMERAL_TYPE
)
14009 error ("use of enum %q#D without previous declaration", name
);
14010 return error_mark_node
;
14014 t
= make_class_type (code
);
14015 TYPE_CONTEXT (t
) = context
;
14016 if (scope
== ts_lambda
)
14018 /* Mark it as a lambda type. */
14019 CLASSTYPE_LAMBDA_EXPR (t
) = error_mark_node
;
14020 /* And push it into current scope. */
14021 scope
= ts_current
;
14023 t
= pushtag (name
, t
, scope
);
14028 if (template_header_p
&& MAYBE_CLASS_TYPE_P (t
))
14030 /* Check that we aren't trying to overload a class with different
14032 tree constr
= NULL_TREE
;
14033 if (current_template_parms
)
14035 tree reqs
= TEMPLATE_PARMS_CONSTRAINTS (current_template_parms
);
14036 constr
= build_constraints (reqs
, NULL_TREE
);
14038 if (!redeclare_class_template (t
, current_template_parms
, constr
))
14039 return error_mark_node
;
14041 else if (!processing_template_decl
14042 && CLASS_TYPE_P (t
)
14043 && CLASSTYPE_IS_TEMPLATE (t
))
14045 error ("redeclaration of %qT as a non-template", t
);
14046 inform (location_of (t
), "previous declaration %qD", t
);
14047 return error_mark_node
;
14050 if (scope
!= ts_within_enclosing_non_class
&& TYPE_HIDDEN_P (t
))
14052 /* This is no longer an invisible friend. Make it
14054 tree decl
= TYPE_NAME (t
);
14056 DECL_ANTICIPATED (decl
) = false;
14057 DECL_FRIEND_P (decl
) = false;
14059 if (TYPE_TEMPLATE_INFO (t
))
14061 tree tmpl
= TYPE_TI_TEMPLATE (t
);
14062 DECL_ANTICIPATED (tmpl
) = false;
14063 DECL_FRIEND_P (tmpl
) = false;
14071 /* Wrapper for xref_tag_1. */
14074 xref_tag (enum tag_types tag_code
, tree name
,
14075 tag_scope scope
, bool template_header_p
)
14079 subtime
= timevar_cond_start (TV_NAME_LOOKUP
);
14080 ret
= xref_tag_1 (tag_code
, name
, scope
, template_header_p
);
14081 timevar_cond_stop (TV_NAME_LOOKUP
, subtime
);
14087 xref_tag_from_type (tree old
, tree id
, tag_scope scope
)
14089 enum tag_types tag_kind
;
14091 if (TREE_CODE (old
) == RECORD_TYPE
)
14092 tag_kind
= (CLASSTYPE_DECLARED_CLASS (old
) ? class_type
: record_type
);
14094 tag_kind
= union_type
;
14096 if (id
== NULL_TREE
)
14097 id
= TYPE_IDENTIFIER (old
);
14099 return xref_tag (tag_kind
, id
, scope
, false);
14102 /* Create the binfo hierarchy for REF with (possibly NULL) base list
14103 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
14104 access_* node, and the TREE_VALUE is the type of the base-class.
14105 Non-NULL TREE_TYPE indicates virtual inheritance. */
14108 xref_basetypes (tree ref
, tree base_list
)
14111 tree binfo
, base_binfo
;
14112 unsigned max_vbases
= 0; /* Maximum direct & indirect virtual bases. */
14113 unsigned max_bases
= 0; /* Maximum direct bases. */
14114 unsigned max_dvbases
= 0; /* Maximum direct virtual bases. */
14116 tree default_access
;
14117 tree igo_prev
; /* Track Inheritance Graph Order. */
14119 if (ref
== error_mark_node
)
14122 /* The base of a derived class is private by default, all others are
14124 default_access
= (TREE_CODE (ref
) == RECORD_TYPE
14125 && CLASSTYPE_DECLARED_CLASS (ref
)
14126 ? access_private_node
: access_public_node
);
14128 /* First, make sure that any templates in base-classes are
14129 instantiated. This ensures that if we call ourselves recursively
14130 we do not get confused about which classes are marked and which
14132 basep
= &base_list
;
14135 tree basetype
= TREE_VALUE (*basep
);
14137 /* The dependent_type_p call below should really be dependent_scope_p
14138 so that we give a hard error about using an incomplete type as a
14139 base, but we allow it with a pedwarn for backward
14141 if (processing_template_decl
14142 && CLASS_TYPE_P (basetype
) && TYPE_BEING_DEFINED (basetype
))
14143 cxx_incomplete_type_diagnostic (NULL_TREE
, basetype
, DK_PEDWARN
);
14144 if (!dependent_type_p (basetype
)
14145 && !complete_type_or_else (basetype
, NULL
))
14146 /* An incomplete type. Remove it from the list. */
14147 *basep
= TREE_CHAIN (*basep
);
14151 if (TREE_TYPE (*basep
))
14153 if (CLASS_TYPE_P (basetype
))
14154 max_vbases
+= vec_safe_length (CLASSTYPE_VBASECLASSES (basetype
));
14155 basep
= &TREE_CHAIN (*basep
);
14158 max_vbases
+= max_dvbases
;
14160 TYPE_MARKED_P (ref
) = 1;
14162 /* The binfo slot should be empty, unless this is an (ill-formed)
14164 gcc_assert (!TYPE_BINFO (ref
) || TYPE_SIZE (ref
));
14166 gcc_assert (TYPE_MAIN_VARIANT (ref
) == ref
);
14168 binfo
= make_tree_binfo (max_bases
);
14170 TYPE_BINFO (ref
) = binfo
;
14171 BINFO_OFFSET (binfo
) = size_zero_node
;
14172 BINFO_TYPE (binfo
) = ref
;
14174 /* Apply base-class info set up to the variants of this type. */
14175 fixup_type_variants (ref
);
14179 vec_alloc (BINFO_BASE_ACCESSES (binfo
), max_bases
);
14180 /* A C++98 POD cannot have base classes. */
14181 CLASSTYPE_NON_LAYOUT_POD_P (ref
) = true;
14183 if (TREE_CODE (ref
) == UNION_TYPE
)
14185 error ("derived union %qT invalid", ref
);
14191 warning (OPT_Wmultiple_inheritance
,
14192 "%qT defined with multiple direct bases", ref
);
14196 /* An aggregate can't have virtual base classes. */
14197 CLASSTYPE_NON_AGGREGATE (ref
) = true;
14199 vec_alloc (CLASSTYPE_VBASECLASSES (ref
), max_vbases
);
14202 warning (OPT_Wvirtual_inheritance
,
14203 "%qT defined with direct virtual base", ref
);
14206 for (igo_prev
= binfo
; base_list
; base_list
= TREE_CHAIN (base_list
))
14208 tree access
= TREE_PURPOSE (base_list
);
14209 int via_virtual
= TREE_TYPE (base_list
) != NULL_TREE
;
14210 tree basetype
= TREE_VALUE (base_list
);
14212 if (access
== access_default_node
)
14213 access
= default_access
;
14215 /* Before C++17, an aggregate cannot have base classes. In C++17, an
14216 aggregate can't have virtual, private, or protected base classes. */
14217 if (cxx_dialect
< cxx17
14218 || access
!= access_public_node
14220 CLASSTYPE_NON_AGGREGATE (ref
) = true;
14222 if (PACK_EXPANSION_P (basetype
))
14223 basetype
= PACK_EXPANSION_PATTERN (basetype
);
14224 if (TREE_CODE (basetype
) == TYPE_DECL
)
14225 basetype
= TREE_TYPE (basetype
);
14226 if (!MAYBE_CLASS_TYPE_P (basetype
) || TREE_CODE (basetype
) == UNION_TYPE
)
14228 error ("base type %qT fails to be a struct or class type",
14233 base_binfo
= NULL_TREE
;
14234 if (CLASS_TYPE_P (basetype
) && !dependent_scope_p (basetype
))
14236 base_binfo
= TYPE_BINFO (basetype
);
14237 /* The original basetype could have been a typedef'd type. */
14238 basetype
= BINFO_TYPE (base_binfo
);
14240 /* Inherit flags from the base. */
14241 TYPE_HAS_NEW_OPERATOR (ref
)
14242 |= TYPE_HAS_NEW_OPERATOR (basetype
);
14243 TYPE_HAS_ARRAY_NEW_OPERATOR (ref
)
14244 |= TYPE_HAS_ARRAY_NEW_OPERATOR (basetype
);
14245 TYPE_GETS_DELETE (ref
) |= TYPE_GETS_DELETE (basetype
);
14246 TYPE_HAS_CONVERSION (ref
) |= TYPE_HAS_CONVERSION (basetype
);
14247 CLASSTYPE_DIAMOND_SHAPED_P (ref
)
14248 |= CLASSTYPE_DIAMOND_SHAPED_P (basetype
);
14249 CLASSTYPE_REPEATED_BASE_P (ref
)
14250 |= CLASSTYPE_REPEATED_BASE_P (basetype
);
14253 /* We must do this test after we've seen through a typedef
14255 if (TYPE_MARKED_P (basetype
))
14257 if (basetype
== ref
)
14258 error ("recursive type %qT undefined", basetype
);
14260 error ("duplicate base type %qT invalid", basetype
);
14264 if (PACK_EXPANSION_P (TREE_VALUE (base_list
)))
14265 /* Regenerate the pack expansion for the bases. */
14266 basetype
= make_pack_expansion (basetype
);
14268 TYPE_MARKED_P (basetype
) = 1;
14270 base_binfo
= copy_binfo (base_binfo
, basetype
, ref
,
14271 &igo_prev
, via_virtual
);
14272 if (!BINFO_INHERITANCE_CHAIN (base_binfo
))
14273 BINFO_INHERITANCE_CHAIN (base_binfo
) = binfo
;
14275 BINFO_BASE_APPEND (binfo
, base_binfo
);
14276 BINFO_BASE_ACCESS_APPEND (binfo
, access
);
14280 /* Update max_vbases to reflect the reality that we are dropping
14281 this base: if it reaches zero we want to undo the vec_alloc
14282 above to avoid inconsistencies during error-recovery: eg, in
14283 build_special_member_call, CLASSTYPE_VBASECLASSES non null
14284 and vtt null (c++/27952). */
14287 if (CLASS_TYPE_P (basetype
))
14289 -= vec_safe_length (CLASSTYPE_VBASECLASSES (basetype
));
14292 if (CLASSTYPE_VBASECLASSES (ref
)
14293 && max_vbases
== 0)
14294 vec_free (CLASSTYPE_VBASECLASSES (ref
));
14296 if (vec_safe_length (CLASSTYPE_VBASECLASSES (ref
)) < max_vbases
)
14297 /* If we didn't get max_vbases vbases, we must have shared at
14298 least one of them, and are therefore diamond shaped. */
14299 CLASSTYPE_DIAMOND_SHAPED_P (ref
) = 1;
14301 /* Unmark all the types. */
14302 for (i
= 0; BINFO_BASE_ITERATE (binfo
, i
, base_binfo
); i
++)
14303 TYPE_MARKED_P (BINFO_TYPE (base_binfo
)) = 0;
14304 TYPE_MARKED_P (ref
) = 0;
14306 /* Now see if we have a repeated base type. */
14307 if (!CLASSTYPE_REPEATED_BASE_P (ref
))
14309 for (base_binfo
= binfo
; base_binfo
;
14310 base_binfo
= TREE_CHAIN (base_binfo
))
14312 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo
)))
14314 CLASSTYPE_REPEATED_BASE_P (ref
) = 1;
14317 TYPE_MARKED_P (BINFO_TYPE (base_binfo
)) = 1;
14319 for (base_binfo
= binfo
; base_binfo
;
14320 base_binfo
= TREE_CHAIN (base_binfo
))
14321 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo
)))
14322 TYPE_MARKED_P (BINFO_TYPE (base_binfo
)) = 0;
14329 /* Copies the enum-related properties from type SRC to type DST.
14330 Used with the underlying type of an enum and the enum itself. */
14332 copy_type_enum (tree dst
, tree src
)
14335 for (t
= dst
; t
; t
= TYPE_NEXT_VARIANT (t
))
14337 TYPE_MIN_VALUE (t
) = TYPE_MIN_VALUE (src
);
14338 TYPE_MAX_VALUE (t
) = TYPE_MAX_VALUE (src
);
14339 TYPE_SIZE (t
) = TYPE_SIZE (src
);
14340 TYPE_SIZE_UNIT (t
) = TYPE_SIZE_UNIT (src
);
14341 SET_TYPE_MODE (dst
, TYPE_MODE (src
));
14342 TYPE_PRECISION (t
) = TYPE_PRECISION (src
);
14343 unsigned valign
= TYPE_ALIGN (src
);
14344 if (TYPE_USER_ALIGN (t
))
14345 valign
= MAX (valign
, TYPE_ALIGN (t
));
14347 TYPE_USER_ALIGN (t
) = TYPE_USER_ALIGN (src
);
14348 SET_TYPE_ALIGN (t
, valign
);
14349 TYPE_UNSIGNED (t
) = TYPE_UNSIGNED (src
);
14353 /* Begin compiling the definition of an enumeration type.
14356 if ENUMTYPE is not NULL_TREE then the type has alredy been found.
14358 UNDERLYING_TYPE is the type that will be used as the storage for
14359 the enumeration type. This should be NULL_TREE if no storage type
14362 ATTRIBUTES are any attributes specified after the enum-key.
14364 SCOPED_ENUM_P is true if this is a scoped enumeration type.
14366 if IS_NEW is not NULL, gets TRUE iff a new type is created.
14368 Returns the type object, as yet incomplete.
14369 Also records info about it so that build_enumerator
14370 may be used to declare the individual values as they are read. */
14373 start_enum (tree name
, tree enumtype
, tree underlying_type
,
14374 tree attributes
, bool scoped_enum_p
, bool *is_new
)
14376 tree prevtype
= NULL_TREE
;
14377 gcc_assert (identifier_p (name
));
14381 /* [C++0x dcl.enum]p5:
14383 If not explicitly specified, the underlying type of a scoped
14384 enumeration type is int. */
14385 if (!underlying_type
&& scoped_enum_p
)
14386 underlying_type
= integer_type_node
;
14388 if (underlying_type
)
14389 underlying_type
= cv_unqualified (underlying_type
);
14391 /* If this is the real definition for a previous forward reference,
14392 fill in the contents in the same object that used to be the
14393 forward reference. */
14395 enumtype
= lookup_and_check_tag (enum_type
, name
,
14396 /*tag_scope=*/ts_current
,
14397 /*template_header_p=*/false);
14399 /* In case of a template_decl, the only check that should be deferred
14400 to instantiation time is the comparison of underlying types. */
14401 if (enumtype
&& TREE_CODE (enumtype
) == ENUMERAL_TYPE
)
14403 if (scoped_enum_p
!= SCOPED_ENUM_P (enumtype
))
14405 error_at (input_location
, "scoped/unscoped mismatch "
14406 "in enum %q#T", enumtype
);
14407 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype
)),
14408 "previous definition here");
14409 enumtype
= error_mark_node
;
14411 else if (ENUM_FIXED_UNDERLYING_TYPE_P (enumtype
) != !! underlying_type
)
14413 error_at (input_location
, "underlying type mismatch "
14414 "in enum %q#T", enumtype
);
14415 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype
)),
14416 "previous definition here");
14417 enumtype
= error_mark_node
;
14419 else if (underlying_type
&& ENUM_UNDERLYING_TYPE (enumtype
)
14420 && !same_type_p (underlying_type
,
14421 ENUM_UNDERLYING_TYPE (enumtype
)))
14423 error_at (input_location
, "different underlying type "
14424 "in enum %q#T", enumtype
);
14425 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype
)),
14426 "previous definition here");
14427 underlying_type
= NULL_TREE
;
14431 if (!enumtype
|| TREE_CODE (enumtype
) != ENUMERAL_TYPE
14432 || processing_template_decl
)
14434 /* In case of error, make a dummy enum to allow parsing to
14436 if (enumtype
== error_mark_node
)
14438 name
= make_anon_name ();
14439 enumtype
= NULL_TREE
;
14442 /* enumtype may be an ENUMERAL_TYPE if this is a redefinition
14443 of an opaque enum, or an opaque enum of an already defined
14444 enumeration (C++11).
14445 In any other case, it'll be NULL_TREE. */
14451 prevtype
= enumtype
;
14453 /* Do not push the decl more than once. */
14455 || TREE_CODE (enumtype
) != ENUMERAL_TYPE
)
14457 enumtype
= cxx_make_type (ENUMERAL_TYPE
);
14458 enumtype
= pushtag (name
, enumtype
, /*tag_scope=*/ts_current
);
14460 /* std::byte aliases anything. */
14461 if (enumtype
!= error_mark_node
14462 && TYPE_CONTEXT (enumtype
) == std_node
14463 && !strcmp ("byte", TYPE_NAME_STRING (enumtype
)))
14464 TYPE_ALIAS_SET (enumtype
) = 0;
14467 enumtype
= xref_tag (enum_type
, name
, /*tag_scope=*/ts_current
,
14470 if (enumtype
== error_mark_node
)
14471 return error_mark_node
;
14473 /* The enum is considered opaque until the opening '{' of the
14474 enumerator list. */
14475 SET_OPAQUE_ENUM_P (enumtype
, true);
14476 ENUM_FIXED_UNDERLYING_TYPE_P (enumtype
) = !! underlying_type
;
14479 SET_SCOPED_ENUM_P (enumtype
, scoped_enum_p
);
14481 cplus_decl_attributes (&enumtype
, attributes
, (int)ATTR_FLAG_TYPE_IN_PLACE
);
14483 if (underlying_type
)
14485 if (ENUM_UNDERLYING_TYPE (enumtype
))
14486 /* We already checked that it matches, don't change it to a different
14487 typedef variant. */;
14488 else if (CP_INTEGRAL_TYPE_P (underlying_type
))
14490 copy_type_enum (enumtype
, underlying_type
);
14491 ENUM_UNDERLYING_TYPE (enumtype
) = underlying_type
;
14493 else if (dependent_type_p (underlying_type
))
14494 ENUM_UNDERLYING_TYPE (enumtype
) = underlying_type
;
14496 error ("underlying type %qT of %qT must be an integral type",
14497 underlying_type
, enumtype
);
14500 /* If into a template class, the returned enum is always the first
14501 declaration (opaque or not) seen. This way all the references to
14502 this type will be to the same declaration. The following ones are used
14503 only to check for definition errors. */
14504 if (prevtype
&& processing_template_decl
)
14510 /* After processing and defining all the values of an enumeration type,
14511 install their decls in the enumeration type.
14512 ENUMTYPE is the type object. */
14515 finish_enum_value_list (tree enumtype
)
14518 tree underlying_type
;
14521 tree minnode
, maxnode
;
14524 bool fixed_underlying_type_p
14525 = ENUM_UNDERLYING_TYPE (enumtype
) != NULL_TREE
;
14527 /* We built up the VALUES in reverse order. */
14528 TYPE_VALUES (enumtype
) = nreverse (TYPE_VALUES (enumtype
));
14530 /* For an enum defined in a template, just set the type of the values;
14531 all further processing is postponed until the template is
14532 instantiated. We need to set the type so that tsubst of a CONST_DECL
14534 if (processing_template_decl
)
14536 for (values
= TYPE_VALUES (enumtype
);
14538 values
= TREE_CHAIN (values
))
14539 TREE_TYPE (TREE_VALUE (values
)) = enumtype
;
14543 /* Determine the minimum and maximum values of the enumerators. */
14544 if (TYPE_VALUES (enumtype
))
14546 minnode
= maxnode
= NULL_TREE
;
14548 for (values
= TYPE_VALUES (enumtype
);
14550 values
= TREE_CHAIN (values
))
14552 decl
= TREE_VALUE (values
);
14554 /* [dcl.enum]: Following the closing brace of an enum-specifier,
14555 each enumerator has the type of its enumeration. Prior to the
14556 closing brace, the type of each enumerator is the type of its
14557 initializing value. */
14558 TREE_TYPE (decl
) = enumtype
;
14560 /* Update the minimum and maximum values, if appropriate. */
14561 value
= DECL_INITIAL (decl
);
14562 if (value
== error_mark_node
)
14563 value
= integer_zero_node
;
14564 /* Figure out what the minimum and maximum values of the
14565 enumerators are. */
14567 minnode
= maxnode
= value
;
14568 else if (tree_int_cst_lt (maxnode
, value
))
14570 else if (tree_int_cst_lt (value
, minnode
))
14577 If the enumerator-list is empty, the underlying type is as if
14578 the enumeration had a single enumerator with value 0. */
14579 minnode
= maxnode
= integer_zero_node
;
14581 if (!fixed_underlying_type_p
)
14583 /* Compute the number of bits require to represent all values of the
14584 enumeration. We must do this before the type of MINNODE and
14585 MAXNODE are transformed, since tree_int_cst_min_precision relies
14586 on the TREE_TYPE of the value it is passed. */
14587 signop sgn
= tree_int_cst_sgn (minnode
) >= 0 ? UNSIGNED
: SIGNED
;
14588 int lowprec
= tree_int_cst_min_precision (minnode
, sgn
);
14589 int highprec
= tree_int_cst_min_precision (maxnode
, sgn
);
14590 int precision
= MAX (lowprec
, highprec
);
14592 bool use_short_enum
;
14594 /* Determine the underlying type of the enumeration.
14598 The underlying type of an enumeration is an integral type that
14599 can represent all the enumerator values defined in the
14600 enumeration. It is implementation-defined which integral type is
14601 used as the underlying type for an enumeration except that the
14602 underlying type shall not be larger than int unless the value of
14603 an enumerator cannot fit in an int or unsigned int.
14605 We use "int" or an "unsigned int" as the underlying type, even if
14606 a smaller integral type would work, unless the user has
14607 explicitly requested that we use the smallest possible type. The
14608 user can request that for all enumerations with a command line
14609 flag, or for just one enumeration with an attribute. */
14611 use_short_enum
= flag_short_enums
14612 || lookup_attribute ("packed", TYPE_ATTRIBUTES (enumtype
));
14614 /* If the precision of the type was specified with an attribute and it
14615 was too small, give an error. Otherwise, use it. */
14616 if (TYPE_PRECISION (enumtype
))
14618 if (precision
> TYPE_PRECISION (enumtype
))
14619 error ("specified mode too small for enumeral values");
14622 use_short_enum
= true;
14623 precision
= TYPE_PRECISION (enumtype
);
14627 for (itk
= (use_short_enum
? itk_char
: itk_int
);
14631 underlying_type
= integer_types
[itk
];
14632 if (underlying_type
!= NULL_TREE
14633 && TYPE_PRECISION (underlying_type
) >= precision
14634 && TYPE_SIGN (underlying_type
) == sgn
)
14637 if (itk
== itk_none
)
14641 IF no integral type can represent all the enumerator values, the
14642 enumeration is ill-formed. */
14643 error ("no integral type can represent all of the enumerator values "
14644 "for %qT", enumtype
);
14645 precision
= TYPE_PRECISION (long_long_integer_type_node
);
14646 underlying_type
= integer_types
[itk_unsigned_long_long
];
14651 The value of sizeof() applied to an enumeration type, an object
14652 of an enumeration type, or an enumerator, is the value of sizeof()
14653 applied to the underlying type. */
14654 copy_type_enum (enumtype
, underlying_type
);
14656 /* Compute the minimum and maximum values for the type.
14660 For an enumeration where emin is the smallest enumerator and emax
14661 is the largest, the values of the enumeration are the values of the
14662 underlying type in the range bmin to bmax, where bmin and bmax are,
14663 respectively, the smallest and largest values of the smallest bit-
14664 field that can store emin and emax. */
14666 /* The middle-end currently assumes that types with TYPE_PRECISION
14667 narrower than their underlying type are suitably zero or sign
14668 extended to fill their mode. Similarly, it assumes that the front
14669 end assures that a value of a particular type must be within
14670 TYPE_MIN_VALUE and TYPE_MAX_VALUE.
14672 We used to set these fields based on bmin and bmax, but that led
14673 to invalid assumptions like optimizing away bounds checking. So
14674 now we just set the TYPE_PRECISION, TYPE_MIN_VALUE, and
14675 TYPE_MAX_VALUE to the values for the mode above and only restrict
14676 the ENUM_UNDERLYING_TYPE for the benefit of diagnostics. */
14677 ENUM_UNDERLYING_TYPE (enumtype
)
14678 = build_distinct_type_copy (underlying_type
);
14679 TYPE_PRECISION (ENUM_UNDERLYING_TYPE (enumtype
)) = precision
;
14680 set_min_and_max_values_for_integral_type
14681 (ENUM_UNDERLYING_TYPE (enumtype
), precision
, sgn
);
14683 /* If -fstrict-enums, still constrain TYPE_MIN/MAX_VALUE. */
14684 if (flag_strict_enums
)
14685 set_min_and_max_values_for_integral_type (enumtype
, precision
, sgn
);
14688 underlying_type
= ENUM_UNDERLYING_TYPE (enumtype
);
14690 /* Convert each of the enumerators to the type of the underlying
14691 type of the enumeration. */
14692 for (values
= TYPE_VALUES (enumtype
); values
; values
= TREE_CHAIN (values
))
14694 location_t saved_location
;
14696 decl
= TREE_VALUE (values
);
14697 saved_location
= input_location
;
14698 input_location
= DECL_SOURCE_LOCATION (decl
);
14699 if (fixed_underlying_type_p
)
14700 /* If the enumeration type has a fixed underlying type, we
14701 already checked all of the enumerator values. */
14702 value
= DECL_INITIAL (decl
);
14704 value
= perform_implicit_conversion (underlying_type
,
14705 DECL_INITIAL (decl
),
14706 tf_warning_or_error
);
14707 input_location
= saved_location
;
14709 /* Do not clobber shared ints. */
14710 if (value
!= error_mark_node
)
14712 value
= copy_node (value
);
14714 TREE_TYPE (value
) = enumtype
;
14716 DECL_INITIAL (decl
) = value
;
14719 /* Fix up all variant types of this enum type. */
14720 for (t
= TYPE_MAIN_VARIANT (enumtype
); t
; t
= TYPE_NEXT_VARIANT (t
))
14721 TYPE_VALUES (t
) = TYPE_VALUES (enumtype
);
14723 if (at_class_scope_p ()
14724 && COMPLETE_TYPE_P (current_class_type
)
14725 && UNSCOPED_ENUM_P (enumtype
))
14727 insert_late_enum_def_bindings (current_class_type
, enumtype
);
14728 /* TYPE_FIELDS needs fixup. */
14729 fixup_type_variants (current_class_type
);
14732 /* Finish debugging output for this type. */
14733 rest_of_type_compilation (enumtype
, namespace_bindings_p ());
14735 /* Each enumerator now has the type of its enumeration. Clear the cache
14736 so that this change in types doesn't confuse us later on. */
14737 clear_cv_and_fold_caches ();
14740 /* Finishes the enum type. This is called only the first time an
14741 enumeration is seen, be it opaque or odinary.
14742 ENUMTYPE is the type object. */
14745 finish_enum (tree enumtype
)
14747 if (processing_template_decl
)
14749 if (at_function_scope_p ())
14750 add_stmt (build_min (TAG_DEFN
, enumtype
));
14754 /* If this is a forward declaration, there should not be any variants,
14755 though we can get a variant in the middle of an enum-specifier with
14756 wacky code like 'enum E { e = sizeof(const E*) };' */
14757 gcc_assert (enumtype
== TYPE_MAIN_VARIANT (enumtype
)
14758 && (TYPE_VALUES (enumtype
)
14759 || !TYPE_NEXT_VARIANT (enumtype
)));
14762 /* Build and install a CONST_DECL for an enumeration constant of the
14763 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
14764 Apply ATTRIBUTES if available. LOC is the location of NAME.
14765 Assignment of sequential values by default is handled here. */
14768 build_enumerator (tree name
, tree value
, tree enumtype
, tree attributes
,
14775 /* scalar_constant_value will pull out this expression, so make sure
14776 it's folded as appropriate. */
14777 if (processing_template_decl
)
14778 value
= fold_non_dependent_expr (value
);
14780 /* If the VALUE was erroneous, pretend it wasn't there; that will
14781 result in the enum being assigned the next value in sequence. */
14782 if (value
== error_mark_node
)
14785 /* Remove no-op casts from the value. */
14787 STRIP_TYPE_NOPS (value
);
14789 if (! processing_template_decl
)
14791 /* Validate and default VALUE. */
14792 if (value
!= NULL_TREE
)
14794 if (!ENUM_UNDERLYING_TYPE (enumtype
))
14796 tree tmp_value
= build_expr_type_conversion (WANT_INT
| WANT_ENUM
,
14801 else if (! INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P
14802 (TREE_TYPE (value
)))
14803 value
= perform_implicit_conversion_flags
14804 (ENUM_UNDERLYING_TYPE (enumtype
), value
, tf_warning_or_error
,
14805 LOOKUP_IMPLICIT
| LOOKUP_NO_NARROWING
);
14807 if (value
== error_mark_node
)
14810 if (value
!= NULL_TREE
)
14812 if (! INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P
14813 (TREE_TYPE (value
)))
14815 error ("enumerator value for %qD must have integral or "
14816 "unscoped enumeration type", name
);
14821 value
= cxx_constant_value (value
);
14823 if (TREE_CODE (value
) != INTEGER_CST
)
14825 error ("enumerator value for %qD is not an integer "
14833 /* Default based on previous value. */
14834 if (value
== NULL_TREE
)
14836 if (TYPE_VALUES (enumtype
))
14840 /* C++03 7.2/4: If no initializer is specified for the first
14841 enumerator, the type is an unspecified integral
14842 type. Otherwise the type is the same as the type of the
14843 initializing value of the preceding enumerator unless the
14844 incremented value is not representable in that type, in
14845 which case the type is an unspecified integral type
14846 sufficient to contain the incremented value. */
14847 prev_value
= DECL_INITIAL (TREE_VALUE (TYPE_VALUES (enumtype
)));
14848 if (error_operand_p (prev_value
))
14849 value
= error_mark_node
;
14852 wi::overflow_type overflowed
;
14853 tree type
= TREE_TYPE (prev_value
);
14854 signop sgn
= TYPE_SIGN (type
);
14855 widest_int wi
= wi::add (wi::to_widest (prev_value
), 1, sgn
,
14859 bool pos
= !wi::neg_p (wi
, sgn
);
14860 if (!wi::fits_to_tree_p (wi
, type
))
14863 for (itk
= itk_int
; itk
!= itk_none
; itk
++)
14865 type
= integer_types
[itk
];
14866 if (type
!= NULL_TREE
14867 && (pos
|| !TYPE_UNSIGNED (type
))
14868 && wi::fits_to_tree_p (wi
, type
))
14871 if (type
&& cxx_dialect
< cxx11
14872 && itk
> itk_unsigned_long
)
14873 pedwarn (input_location
, OPT_Wlong_long
,
14875 incremented enumerator value is too large for %<unsigned long%>") : G_("\
14876 incremented enumerator value is too large for %<long%>"));
14878 if (type
== NULL_TREE
)
14879 overflowed
= wi::OVF_UNKNOWN
;
14881 value
= wide_int_to_tree (type
, wi
);
14886 error ("overflow in enumeration values at %qD", name
);
14887 value
= error_mark_node
;
14892 value
= integer_zero_node
;
14895 /* Remove no-op casts from the value. */
14896 STRIP_TYPE_NOPS (value
);
14898 /* If the underlying type of the enum is fixed, check whether
14899 the enumerator values fits in the underlying type. If it
14900 does not fit, the program is ill-formed [C++0x dcl.enum]. */
14901 if (ENUM_UNDERLYING_TYPE (enumtype
)
14903 && TREE_CODE (value
) == INTEGER_CST
)
14905 if (!int_fits_type_p (value
, ENUM_UNDERLYING_TYPE (enumtype
)))
14906 error ("enumerator value %qE is outside the range of underlying "
14907 "type %qT", value
, ENUM_UNDERLYING_TYPE (enumtype
));
14909 /* Convert the value to the appropriate type. */
14910 value
= fold_convert (ENUM_UNDERLYING_TYPE (enumtype
), value
);
14914 /* C++ associates enums with global, function, or class declarations. */
14915 context
= current_scope ();
14917 /* Build the actual enumeration constant. Note that the enumeration
14918 constants have the underlying type of the enum (if it is fixed)
14919 or the type of their initializer (if the underlying type of the
14920 enum is not fixed):
14924 If the underlying type is fixed, the type of each enumerator
14925 prior to the closing brace is the underlying type; if the
14926 initializing value of an enumerator cannot be represented by
14927 the underlying type, the program is ill-formed. If the
14928 underlying type is not fixed, the type of each enumerator is
14929 the type of its initializing value.
14931 If the underlying type is not fixed, it will be computed by
14932 finish_enum and we will reset the type of this enumerator. Of
14933 course, if we're processing a template, there may be no value. */
14934 type
= value
? TREE_TYPE (value
) : NULL_TREE
;
14936 decl
= build_decl (loc
, CONST_DECL
, name
, type
);
14938 DECL_CONTEXT (decl
) = enumtype
;
14939 TREE_CONSTANT (decl
) = 1;
14940 TREE_READONLY (decl
) = 1;
14941 DECL_INITIAL (decl
) = value
;
14944 cplus_decl_attributes (&decl
, attributes
, 0);
14946 if (context
&& context
== current_class_type
&& !SCOPED_ENUM_P (enumtype
))
14948 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
14949 on the TYPE_FIELDS list for `S'. (That's so that you can say
14950 things like `S::i' later.) */
14952 /* The enumerator may be getting declared outside of its enclosing
14955 class S { public: enum E : int; }; enum S::E : int { i = 7; };
14957 For which case we need to make sure that the access of `S::i'
14958 matches the access of `S::E'. */
14959 tree saved_cas
= current_access_specifier
;
14960 if (TREE_PRIVATE (TYPE_NAME (enumtype
)))
14961 current_access_specifier
= access_private_node
;
14962 else if (TREE_PROTECTED (TYPE_NAME (enumtype
)))
14963 current_access_specifier
= access_protected_node
;
14965 current_access_specifier
= access_public_node
;
14967 finish_member_declaration (decl
);
14969 current_access_specifier
= saved_cas
;
14974 /* Add this enumeration constant to the list for this type. */
14975 TYPE_VALUES (enumtype
) = tree_cons (name
, decl
, TYPE_VALUES (enumtype
));
14978 /* Look for an enumerator with the given NAME within the enumeration
14979 type ENUMTYPE. This routine is used primarily for qualified name
14980 lookup into an enumerator in C++0x, e.g.,
14982 enum class Color { Red, Green, Blue };
14984 Color color = Color::Red;
14986 Returns the value corresponding to the enumerator, or
14987 NULL_TREE if no such enumerator was found. */
14989 lookup_enumerator (tree enumtype
, tree name
)
14992 gcc_assert (enumtype
&& TREE_CODE (enumtype
) == ENUMERAL_TYPE
);
14994 e
= purpose_member (name
, TYPE_VALUES (enumtype
));
14995 return e
? TREE_VALUE (e
) : NULL_TREE
;
14999 /* We're defining DECL. Make sure that its type is OK. */
15002 check_function_type (tree decl
, tree current_function_parms
)
15004 tree fntype
= TREE_TYPE (decl
);
15005 tree return_type
= complete_type (TREE_TYPE (fntype
));
15007 /* In a function definition, arg types must be complete. */
15008 require_complete_types_for_parms (current_function_parms
);
15010 if (dependent_type_p (return_type
)
15011 || type_uses_auto (return_type
))
15013 if (!COMPLETE_OR_VOID_TYPE_P (return_type
))
15015 tree args
= TYPE_ARG_TYPES (fntype
);
15017 error ("return type %q#T is incomplete", return_type
);
15019 /* Make it return void instead. */
15020 if (TREE_CODE (fntype
) == METHOD_TYPE
)
15021 fntype
= build_method_type_directly (TREE_TYPE (TREE_VALUE (args
)),
15023 TREE_CHAIN (args
));
15025 fntype
= build_function_type (void_type_node
, args
);
15026 fntype
= (cp_build_type_attribute_variant
15027 (fntype
, TYPE_ATTRIBUTES (TREE_TYPE (decl
))));
15028 fntype
= cxx_copy_lang_qualifiers (fntype
, TREE_TYPE (decl
));
15029 TREE_TYPE (decl
) = fntype
;
15033 abstract_virtuals_error (decl
, TREE_TYPE (fntype
));
15034 maybe_warn_parm_abi (TREE_TYPE (fntype
),
15035 DECL_SOURCE_LOCATION (decl
));
15039 /* True iff FN is an implicitly-defined default constructor. */
15042 implicit_default_ctor_p (tree fn
)
15044 return (DECL_CONSTRUCTOR_P (fn
)
15045 && !user_provided_p (fn
)
15046 && sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (fn
)));
15049 /* Clobber the contents of *this to let the back end know that the object
15050 storage is dead when we enter the constructor or leave the destructor. */
15053 build_clobber_this ()
15055 /* Clobbering an empty base is pointless, and harmful if its one byte
15056 TYPE_SIZE overlays real data. */
15057 if (is_empty_class (current_class_type
))
15060 /* If we have virtual bases, clobber the whole object, but only if we're in
15061 charge. If we don't have virtual bases, clobber the as-base type so we
15062 don't mess with tail padding. */
15063 bool vbases
= CLASSTYPE_VBASECLASSES (current_class_type
);
15065 tree ctype
= current_class_type
;
15067 ctype
= CLASSTYPE_AS_BASE (ctype
);
15069 tree clobber
= build_clobber (ctype
);
15071 tree thisref
= current_class_ref
;
15072 if (ctype
!= current_class_type
)
15074 thisref
= build_nop (build_reference_type (ctype
), current_class_ptr
);
15075 thisref
= convert_from_reference (thisref
);
15078 tree exprstmt
= build2 (MODIFY_EXPR
, void_type_node
, thisref
, clobber
);
15080 exprstmt
= build_if_in_charge (exprstmt
);
15085 /* Create the FUNCTION_DECL for a function definition.
15086 DECLSPECS and DECLARATOR are the parts of the declaration;
15087 they describe the function's name and the type it returns,
15088 but twisted together in a fashion that parallels the syntax of C.
15090 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
15091 DECLARATOR is really the DECL for the function we are about to
15092 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
15093 indicating that the function is an inline defined in-class.
15095 This function creates a binding context for the function body
15096 as well as setting up the FUNCTION_DECL in current_function_decl.
15098 For C++, we must first check whether that datum makes any sense.
15099 For example, "class A local_a(1,2);" means that variable local_a
15100 is an aggregate of type A, which should have a constructor
15101 applied to it with the argument list [1, 2].
15103 On entry, DECL_INITIAL (decl1) should be NULL_TREE or error_mark_node,
15104 or may be a BLOCK if the function has been defined previously
15105 in this translation unit. On exit, DECL_INITIAL (decl1) will be
15106 error_mark_node if the function has never been defined, or
15107 a BLOCK if the function has been defined somewhere. */
15110 start_preparsed_function (tree decl1
, tree attrs
, int flags
)
15112 tree ctype
= NULL_TREE
;
15115 int doing_friend
= 0;
15116 cp_binding_level
*bl
;
15117 tree current_function_parms
;
15118 struct c_fileinfo
*finfo
15119 = get_fileinfo (LOCATION_FILE (DECL_SOURCE_LOCATION (decl1
)));
15120 bool honor_interface
;
15122 /* Sanity check. */
15123 gcc_assert (VOID_TYPE_P (TREE_VALUE (void_list_node
)));
15124 gcc_assert (TREE_CHAIN (void_list_node
) == NULL_TREE
);
15126 fntype
= TREE_TYPE (decl1
);
15127 if (TREE_CODE (fntype
) == METHOD_TYPE
)
15128 ctype
= TYPE_METHOD_BASETYPE (fntype
);
15130 /* ISO C++ 11.4/5. A friend function defined in a class is in
15131 the (lexical) scope of the class in which it is defined. */
15132 if (!ctype
&& DECL_FRIEND_P (decl1
))
15134 ctype
= DECL_FRIEND_CONTEXT (decl1
);
15136 /* CTYPE could be null here if we're dealing with a template;
15137 for example, `inline friend float foo()' inside a template
15138 will have no CTYPE set. */
15139 if (ctype
&& TREE_CODE (ctype
) != RECORD_TYPE
)
15145 if (DECL_DECLARED_INLINE_P (decl1
)
15146 && lookup_attribute ("noinline", attrs
))
15147 warning_at (DECL_SOURCE_LOCATION (decl1
), 0,
15148 "inline function %qD given attribute noinline", decl1
);
15150 /* Handle gnu_inline attribute. */
15151 if (GNU_INLINE_P (decl1
))
15153 DECL_EXTERNAL (decl1
) = 1;
15154 DECL_NOT_REALLY_EXTERN (decl1
) = 0;
15155 DECL_INTERFACE_KNOWN (decl1
) = 1;
15156 DECL_DISREGARD_INLINE_LIMITS (decl1
) = 1;
15159 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl1
))
15160 /* This is a constructor, we must ensure that any default args
15161 introduced by this definition are propagated to the clones
15162 now. The clones are used directly in overload resolution. */
15163 adjust_clone_args (decl1
);
15165 /* Sometimes we don't notice that a function is a static member, and
15166 build a METHOD_TYPE for it. Fix that up now. */
15167 gcc_assert (!(ctype
!= NULL_TREE
&& DECL_STATIC_FUNCTION_P (decl1
)
15168 && TREE_CODE (TREE_TYPE (decl1
)) == METHOD_TYPE
));
15170 /* Set up current_class_type, and enter the scope of the class, if
15173 push_nested_class (ctype
);
15174 else if (DECL_STATIC_FUNCTION_P (decl1
))
15175 push_nested_class (DECL_CONTEXT (decl1
));
15177 /* Now that we have entered the scope of the class, we must restore
15178 the bindings for any template parameters surrounding DECL1, if it
15179 is an inline member template. (Order is important; consider the
15180 case where a template parameter has the same name as a field of
15181 the class.) It is not until after this point that
15182 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
15183 if (flags
& SF_INCLASS_INLINE
)
15184 maybe_begin_member_template_processing (decl1
);
15186 /* Effective C++ rule 15. */
15188 && DECL_ASSIGNMENT_OPERATOR_P (decl1
)
15189 && DECL_OVERLOADED_OPERATOR_IS (decl1
, NOP_EXPR
)
15190 && VOID_TYPE_P (TREE_TYPE (fntype
)))
15191 warning (OPT_Weffc__
,
15192 "%<operator=%> should return a reference to %<*this%>");
15194 /* Make the init_value nonzero so pushdecl knows this is not tentative.
15195 error_mark_node is replaced below (in poplevel) with the BLOCK. */
15196 if (!DECL_INITIAL (decl1
))
15197 DECL_INITIAL (decl1
) = error_mark_node
;
15199 /* This function exists in static storage.
15200 (This does not mean `static' in the C sense!) */
15201 TREE_STATIC (decl1
) = 1;
15203 /* We must call push_template_decl after current_class_type is set
15204 up. (If we are processing inline definitions after exiting a
15205 class scope, current_class_type will be NULL_TREE until set above
15206 by push_nested_class.) */
15207 if (processing_template_decl
)
15209 tree newdecl1
= push_template_decl (decl1
);
15210 if (newdecl1
== error_mark_node
)
15212 if (ctype
|| DECL_STATIC_FUNCTION_P (decl1
))
15213 pop_nested_class ();
15219 /* Make sure the parameter and return types are reasonable. When
15220 you declare a function, these types can be incomplete, but they
15221 must be complete when you define the function. */
15222 check_function_type (decl1
, DECL_ARGUMENTS (decl1
));
15224 /* Build the return declaration for the function. */
15225 restype
= TREE_TYPE (fntype
);
15227 if (DECL_RESULT (decl1
) == NULL_TREE
)
15231 resdecl
= build_decl (input_location
, RESULT_DECL
, 0, restype
);
15232 DECL_ARTIFICIAL (resdecl
) = 1;
15233 DECL_IGNORED_P (resdecl
) = 1;
15234 DECL_RESULT (decl1
) = resdecl
;
15236 cp_apply_type_quals_to_decl (cp_type_quals (restype
), resdecl
);
15239 /* Record the decl so that the function name is defined.
15240 If we already have a decl for this name, and it is a FUNCTION_DECL,
15241 use the old decl. */
15242 if (!processing_template_decl
&& !(flags
& SF_PRE_PARSED
))
15244 /* A specialization is not used to guide overload resolution. */
15245 if (!DECL_FUNCTION_MEMBER_P (decl1
)
15246 && !(DECL_USE_TEMPLATE (decl1
) &&
15247 PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl1
))))
15249 tree olddecl
= pushdecl (decl1
);
15251 if (olddecl
== error_mark_node
)
15252 /* If something went wrong when registering the declaration,
15253 use DECL1; we have to have a FUNCTION_DECL to use when
15254 parsing the body of the function. */
15258 /* Otherwise, OLDDECL is either a previous declaration
15259 of the same function or DECL1 itself. */
15261 if (warn_missing_declarations
15262 && olddecl
== decl1
15263 && !DECL_MAIN_P (decl1
)
15264 && TREE_PUBLIC (decl1
)
15265 && !DECL_DECLARED_INLINE_P (decl1
))
15269 /* Check whether DECL1 is in an anonymous
15271 for (context
= DECL_CONTEXT (decl1
);
15273 context
= DECL_CONTEXT (context
))
15275 if (TREE_CODE (context
) == NAMESPACE_DECL
15276 && DECL_NAME (context
) == NULL_TREE
)
15280 if (context
== NULL
)
15281 warning_at (DECL_SOURCE_LOCATION (decl1
),
15282 OPT_Wmissing_declarations
,
15283 "no previous declaration for %qD", decl1
);
15291 /* We need to set the DECL_CONTEXT. */
15292 if (!DECL_CONTEXT (decl1
) && DECL_TEMPLATE_INFO (decl1
))
15293 DECL_CONTEXT (decl1
) = DECL_CONTEXT (DECL_TI_TEMPLATE (decl1
));
15295 fntype
= TREE_TYPE (decl1
);
15296 restype
= TREE_TYPE (fntype
);
15298 /* If #pragma weak applies, mark the decl appropriately now.
15299 The pragma only applies to global functions. Because
15300 determining whether or not the #pragma applies involves
15301 computing the mangled name for the declaration, we cannot
15302 apply the pragma until after we have merged this declaration
15303 with any previous declarations; if the original declaration
15304 has a linkage specification, that specification applies to
15305 the definition as well, and may affect the mangled name. */
15306 if (DECL_FILE_SCOPE_P (decl1
))
15307 maybe_apply_pragma_weak (decl1
);
15310 /* We are now in the scope of the function being defined. */
15311 current_function_decl
= decl1
;
15313 /* Save the parm names or decls from this function's declarator
15314 where store_parm_decls will find them. */
15315 current_function_parms
= DECL_ARGUMENTS (decl1
);
15317 /* Let the user know we're compiling this function. */
15318 announce_function (decl1
);
15320 gcc_assert (DECL_INITIAL (decl1
));
15322 /* This function may already have been parsed, in which case just
15323 return; our caller will skip over the body without parsing. */
15324 if (DECL_INITIAL (decl1
) != error_mark_node
)
15327 /* Initialize RTL machinery. We cannot do this until
15328 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
15329 even when processing a template; this is how we get
15330 CFUN set up, and our per-function variables initialized.
15331 FIXME factor out the non-RTL stuff. */
15332 bl
= current_binding_level
;
15333 allocate_struct_function (decl1
, processing_template_decl
);
15335 /* Initialize the language data structures. Whenever we start
15336 a new function, we destroy temporaries in the usual way. */
15337 cfun
->language
= ggc_cleared_alloc
<language_function
> ();
15338 current_stmt_tree ()->stmts_are_full_exprs_p
= 1;
15339 current_binding_level
= bl
;
15341 if (!processing_template_decl
&& type_uses_auto (restype
))
15343 FNDECL_USED_AUTO (decl1
) = true;
15344 current_function_auto_return_pattern
= restype
;
15347 /* Start the statement-tree, start the tree now. */
15348 DECL_SAVED_TREE (decl1
) = push_stmt_list ();
15350 /* If we are (erroneously) defining a function that we have already
15351 defined before, wipe out what we knew before. */
15352 if (!DECL_PENDING_INLINE_P (decl1
))
15353 DECL_SAVED_FUNCTION_DATA (decl1
) = NULL
;
15355 if (ctype
&& !doing_friend
&& !DECL_STATIC_FUNCTION_P (decl1
))
15357 /* We know that this was set up by `grokclassfn'. We do not
15358 wait until `store_parm_decls', since evil parse errors may
15359 never get us to that point. Here we keep the consistency
15360 between `current_class_type' and `current_class_ptr'. */
15361 tree t
= DECL_ARGUMENTS (decl1
);
15363 gcc_assert (t
!= NULL_TREE
&& TREE_CODE (t
) == PARM_DECL
);
15364 gcc_assert (TYPE_PTR_P (TREE_TYPE (t
)));
15366 cp_function_chain
->x_current_class_ref
15367 = cp_build_fold_indirect_ref (t
);
15368 /* Set this second to avoid shortcut in cp_build_indirect_ref. */
15369 cp_function_chain
->x_current_class_ptr
= t
;
15371 /* Constructors and destructors need to know whether they're "in
15372 charge" of initializing virtual base classes. */
15373 t
= DECL_CHAIN (t
);
15374 if (DECL_HAS_IN_CHARGE_PARM_P (decl1
))
15376 current_in_charge_parm
= t
;
15377 t
= DECL_CHAIN (t
);
15379 if (DECL_HAS_VTT_PARM_P (decl1
))
15381 gcc_assert (DECL_NAME (t
) == vtt_parm_identifier
);
15382 current_vtt_parm
= t
;
15386 honor_interface
= (!DECL_TEMPLATE_INSTANTIATION (decl1
)
15387 /* Implicitly-defined methods (like the
15388 destructor for a class in which no destructor
15389 is explicitly declared) must not be defined
15390 until their definition is needed. So, we
15391 ignore interface specifications for
15392 compiler-generated functions. */
15393 && !DECL_ARTIFICIAL (decl1
));
15395 if (processing_template_decl
)
15396 /* Don't mess with interface flags. */;
15397 else if (DECL_INTERFACE_KNOWN (decl1
))
15399 tree ctx
= decl_function_context (decl1
);
15401 if (DECL_NOT_REALLY_EXTERN (decl1
))
15402 DECL_EXTERNAL (decl1
) = 0;
15404 if (ctx
!= NULL_TREE
&& vague_linkage_p (ctx
))
15405 /* This is a function in a local class in an extern inline
15406 or template function. */
15407 comdat_linkage (decl1
);
15409 /* If this function belongs to an interface, it is public.
15410 If it belongs to someone else's interface, it is also external.
15411 This only affects inlines and template instantiations. */
15412 else if (!finfo
->interface_unknown
&& honor_interface
)
15414 if (DECL_DECLARED_INLINE_P (decl1
)
15415 || DECL_TEMPLATE_INSTANTIATION (decl1
))
15417 DECL_EXTERNAL (decl1
)
15418 = (finfo
->interface_only
15419 || (DECL_DECLARED_INLINE_P (decl1
)
15420 && ! flag_implement_inlines
15421 && !DECL_VINDEX (decl1
)));
15423 /* For WIN32 we also want to put these in linkonce sections. */
15424 maybe_make_one_only (decl1
);
15427 DECL_EXTERNAL (decl1
) = 0;
15428 DECL_INTERFACE_KNOWN (decl1
) = 1;
15429 /* If this function is in an interface implemented in this file,
15430 make sure that the back end knows to emit this function
15432 if (!DECL_EXTERNAL (decl1
))
15433 mark_needed (decl1
);
15435 else if (finfo
->interface_unknown
&& finfo
->interface_only
15436 && honor_interface
)
15438 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
15439 interface, we will have both finfo->interface_unknown and
15440 finfo->interface_only set. In that case, we don't want to
15441 use the normal heuristics because someone will supply a
15442 #pragma implementation elsewhere, and deducing it here would
15443 produce a conflict. */
15444 comdat_linkage (decl1
);
15445 DECL_EXTERNAL (decl1
) = 0;
15446 DECL_INTERFACE_KNOWN (decl1
) = 1;
15447 DECL_DEFER_OUTPUT (decl1
) = 1;
15451 /* This is a definition, not a reference.
15452 So clear DECL_EXTERNAL, unless this is a GNU extern inline. */
15453 if (!GNU_INLINE_P (decl1
))
15454 DECL_EXTERNAL (decl1
) = 0;
15456 if ((DECL_DECLARED_INLINE_P (decl1
)
15457 || DECL_TEMPLATE_INSTANTIATION (decl1
))
15458 && ! DECL_INTERFACE_KNOWN (decl1
))
15459 DECL_DEFER_OUTPUT (decl1
) = 1;
15461 DECL_INTERFACE_KNOWN (decl1
) = 1;
15464 /* Determine the ELF visibility attribute for the function. We must not
15465 do this before calling "pushdecl", as we must allow "duplicate_decls"
15466 to merge any attributes appropriately. We also need to wait until
15468 if (!DECL_CLONED_FUNCTION_P (decl1
))
15469 determine_visibility (decl1
);
15471 if (!processing_template_decl
)
15472 maybe_instantiate_noexcept (decl1
);
15474 begin_scope (sk_function_parms
, decl1
);
15478 if (DECL_DESTRUCTOR_P (decl1
)
15479 || (DECL_CONSTRUCTOR_P (decl1
)
15480 && targetm
.cxx
.cdtor_returns_this ()))
15482 cdtor_label
= create_artificial_label (input_location
);
15483 LABEL_DECL_CDTOR (cdtor_label
) = true;
15486 start_fname_decls ();
15488 store_parm_decls (current_function_parms
);
15490 if (!processing_template_decl
15491 && (flag_lifetime_dse
> 1)
15492 && DECL_CONSTRUCTOR_P (decl1
)
15493 && !DECL_CLONED_FUNCTION_P (decl1
)
15494 /* Clobbering an empty base is harmful if it overlays real data. */
15495 && !is_empty_class (current_class_type
)
15496 /* We can't clobber safely for an implicitly-defined default constructor
15497 because part of the initialization might happen before we enter the
15498 constructor, via AGGR_INIT_ZERO_FIRST (c++/68006). */
15499 && !implicit_default_ctor_p (decl1
))
15500 finish_expr_stmt (build_clobber_this ());
15502 if (!processing_template_decl
15503 && DECL_CONSTRUCTOR_P (decl1
)
15504 && sanitize_flags_p (SANITIZE_VPTR
)
15505 && !DECL_CLONED_FUNCTION_P (decl1
)
15506 && !implicit_default_ctor_p (decl1
))
15507 cp_ubsan_maybe_initialize_vtbl_ptrs (current_class_ptr
);
15509 start_lambda_scope (decl1
);
15515 /* Like start_preparsed_function, except that instead of a
15516 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
15518 Returns true on success. If the DECLARATOR is not suitable
15519 for a function, we return false, which tells the parser to
15520 skip the entire function. */
15523 start_function (cp_decl_specifier_seq
*declspecs
,
15524 const cp_declarator
*declarator
,
15529 decl1
= grokdeclarator (declarator
, declspecs
, FUNCDEF
, 1, &attrs
);
15530 invoke_plugin_callbacks (PLUGIN_START_PARSE_FUNCTION
, decl1
);
15531 if (decl1
== error_mark_node
)
15533 /* If the declarator is not suitable for a function definition,
15534 cause a syntax error. */
15535 if (decl1
== NULL_TREE
|| TREE_CODE (decl1
) != FUNCTION_DECL
)
15537 error ("invalid function declaration");
15541 if (DECL_MAIN_P (decl1
))
15542 /* main must return int. grokfndecl should have corrected it
15543 (and issued a diagnostic) if the user got it wrong. */
15544 gcc_assert (same_type_p (TREE_TYPE (TREE_TYPE (decl1
)),
15545 integer_type_node
));
15547 return start_preparsed_function (decl1
, attrs
, /*flags=*/SF_DEFAULT
);
15550 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
15554 use_eh_spec_block (tree fn
)
15556 return (flag_exceptions
&& flag_enforce_eh_specs
15557 && !processing_template_decl
15558 && !type_throw_all_p (TREE_TYPE (fn
))
15559 /* We insert the EH_SPEC_BLOCK only in the original
15560 function; then, it is copied automatically to the
15562 && !DECL_CLONED_FUNCTION_P (fn
)
15563 /* Implicitly-generated constructors and destructors have
15564 exception specifications. However, those specifications
15565 are the union of the possible exceptions specified by the
15566 constructors/destructors for bases and members, so no
15567 unallowed exception will ever reach this function. By
15568 not creating the EH_SPEC_BLOCK we save a little memory,
15569 and we avoid spurious warnings about unreachable
15571 && !DECL_DEFAULTED_FN (fn
));
15574 /* Store the parameter declarations into the current function declaration.
15575 This is called after parsing the parameter declarations, before
15576 digesting the body of the function.
15578 Also install to binding contour return value identifier, if any. */
15581 store_parm_decls (tree current_function_parms
)
15583 tree fndecl
= current_function_decl
;
15586 /* This is a chain of any other decls that came in among the parm
15587 declarations. If a parm is declared with enum {foo, bar} x;
15588 then CONST_DECLs for foo and bar are put here. */
15589 tree nonparms
= NULL_TREE
;
15591 if (current_function_parms
)
15593 /* This case is when the function was defined with an ANSI prototype.
15594 The parms already have decls, so we need not do anything here
15595 except record them as in effect
15596 and complain if any redundant old-style parm decls were written. */
15598 tree specparms
= current_function_parms
;
15601 /* Must clear this because it might contain TYPE_DECLs declared
15603 current_binding_level
->names
= NULL
;
15605 /* If we're doing semantic analysis, then we'll call pushdecl
15606 for each of these. We must do them in reverse order so that
15607 they end in the correct forward order. */
15608 specparms
= nreverse (specparms
);
15610 for (parm
= specparms
; parm
; parm
= next
)
15612 next
= DECL_CHAIN (parm
);
15613 if (TREE_CODE (parm
) == PARM_DECL
)
15617 /* If we find an enum constant or a type tag,
15618 put it aside for the moment. */
15619 TREE_CHAIN (parm
) = NULL_TREE
;
15620 nonparms
= chainon (nonparms
, parm
);
15624 /* Get the decls in their original chain order and record in the
15625 function. This is all and only the PARM_DECLs that were
15626 pushed into scope by the loop above. */
15627 DECL_ARGUMENTS (fndecl
) = get_local_decls ();
15630 DECL_ARGUMENTS (fndecl
) = NULL_TREE
;
15632 /* Now store the final chain of decls for the arguments
15633 as the decl-chain of the current lexical scope.
15634 Put the enumerators in as well, at the front so that
15635 DECL_ARGUMENTS is not modified. */
15636 current_binding_level
->names
= chainon (nonparms
, DECL_ARGUMENTS (fndecl
));
15638 if (use_eh_spec_block (current_function_decl
))
15639 current_eh_spec_block
= begin_eh_spec_block ();
15643 /* We have finished doing semantic analysis on DECL, but have not yet
15644 generated RTL for its body. Save away our current state, so that
15645 when we want to generate RTL later we know what to do. */
15648 save_function_data (tree decl
)
15650 struct language_function
*f
;
15652 /* Save the language-specific per-function data so that we can
15653 get it back when we really expand this function. */
15654 gcc_assert (!DECL_PENDING_INLINE_P (decl
));
15657 f
= ggc_alloc
<language_function
> ();
15658 memcpy (f
, cp_function_chain
, sizeof (struct language_function
));
15659 DECL_SAVED_FUNCTION_DATA (decl
) = f
;
15661 /* Clear out the bits we don't need. */
15662 f
->base
.x_stmt_tree
.x_cur_stmt_list
= NULL
;
15663 f
->bindings
= NULL
;
15664 f
->base
.local_typedefs
= NULL
;
15668 /* Set the return value of the constructor (if present). */
15671 finish_constructor_body (void)
15676 if (targetm
.cxx
.cdtor_returns_this ())
15678 /* Any return from a constructor will end up here. */
15679 add_stmt (build_stmt (input_location
, LABEL_EXPR
, cdtor_label
));
15681 val
= DECL_ARGUMENTS (current_function_decl
);
15682 val
= build2 (MODIFY_EXPR
, TREE_TYPE (val
),
15683 DECL_RESULT (current_function_decl
), val
);
15684 /* Return the address of the object. */
15685 exprstmt
= build_stmt (input_location
, RETURN_EXPR
, val
);
15686 add_stmt (exprstmt
);
15690 /* Do all the processing for the beginning of a destructor; set up the
15691 vtable pointers and cleanups for bases and members. */
15694 begin_destructor_body (void)
15696 tree compound_stmt
;
15698 /* If the CURRENT_CLASS_TYPE is incomplete, we will have already
15699 issued an error message. We still want to try to process the
15700 body of the function, but initialize_vtbl_ptrs will crash if
15701 TYPE_BINFO is NULL. */
15702 if (COMPLETE_TYPE_P (current_class_type
))
15704 compound_stmt
= begin_compound_stmt (0);
15705 /* Make all virtual function table pointers in non-virtual base
15706 classes point to CURRENT_CLASS_TYPE's virtual function
15708 initialize_vtbl_ptrs (current_class_ptr
);
15709 finish_compound_stmt (compound_stmt
);
15711 if (flag_lifetime_dse
15712 /* Clobbering an empty base is harmful if it overlays real data. */
15713 && !is_empty_class (current_class_type
))
15715 if (sanitize_flags_p (SANITIZE_VPTR
)
15716 && (flag_sanitize_recover
& SANITIZE_VPTR
) == 0
15717 && TYPE_CONTAINS_VPTR_P (current_class_type
))
15719 tree binfo
= TYPE_BINFO (current_class_type
);
15721 = cp_build_fold_indirect_ref (current_class_ptr
);
15723 tree vtbl_ptr
= build_vfield_ref (ref
, TREE_TYPE (binfo
));
15724 tree vtbl
= build_zero_cst (TREE_TYPE (vtbl_ptr
));
15725 tree stmt
= cp_build_modify_expr (input_location
, vtbl_ptr
,
15727 tf_warning_or_error
);
15728 /* If the vptr is shared with some virtual nearly empty base,
15729 don't clear it if not in charge, the dtor of the virtual
15730 nearly empty base will do that later. */
15731 if (CLASSTYPE_VBASECLASSES (current_class_type
)
15732 && CLASSTYPE_PRIMARY_BINFO (current_class_type
)
15734 (CLASSTYPE_PRIMARY_BINFO (current_class_type
)))
15736 stmt
= convert_to_void (stmt
, ICV_STATEMENT
,
15737 tf_warning_or_error
);
15738 stmt
= build_if_in_charge (stmt
);
15740 finish_decl_cleanup (NULL_TREE
, stmt
);
15743 finish_decl_cleanup (NULL_TREE
, build_clobber_this ());
15746 /* And insert cleanups for our bases and members so that they
15747 will be properly destroyed if we throw. */
15748 push_base_cleanups ();
15752 /* At the end of every destructor we generate code to delete the object if
15753 necessary. Do that now. */
15756 finish_destructor_body (void)
15760 /* Any return from a destructor will end up here; that way all base
15761 and member cleanups will be run when the function returns. */
15762 add_stmt (build_stmt (input_location
, LABEL_EXPR
, cdtor_label
));
15764 if (targetm
.cxx
.cdtor_returns_this ())
15768 val
= DECL_ARGUMENTS (current_function_decl
);
15769 val
= build2 (MODIFY_EXPR
, TREE_TYPE (val
),
15770 DECL_RESULT (current_function_decl
), val
);
15771 /* Return the address of the object. */
15772 exprstmt
= build_stmt (input_location
, RETURN_EXPR
, val
);
15773 add_stmt (exprstmt
);
15777 /* Do the necessary processing for the beginning of a function body, which
15778 in this case includes member-initializers, but not the catch clauses of
15779 a function-try-block. Currently, this means opening a binding level
15780 for the member-initializers (in a ctor), member cleanups (in a dtor),
15781 and capture proxies (in a lambda operator()). */
15784 begin_function_body (void)
15788 if (! FUNCTION_NEEDS_BODY_BLOCK (current_function_decl
))
15791 if (processing_template_decl
)
15792 /* Do nothing now. */;
15794 /* Always keep the BLOCK node associated with the outermost pair of
15795 curly braces of a function. These are needed for correct
15796 operation of dwarfout.c. */
15797 keep_next_level (true);
15799 stmt
= begin_compound_stmt (BCS_FN_BODY
);
15801 if (processing_template_decl
)
15802 /* Do nothing now. */;
15803 else if (DECL_DESTRUCTOR_P (current_function_decl
))
15804 begin_destructor_body ();
15809 /* Do the processing for the end of a function body. Currently, this means
15810 closing out the cleanups for fully-constructed bases and members, and in
15811 the case of the destructor, deleting the object if desired. Again, this
15812 is only meaningful for [cd]tors, since they are the only functions where
15813 there is a significant distinction between the main body and any
15814 function catch clauses. Handling, say, main() return semantics here
15815 would be wrong, as flowing off the end of a function catch clause for
15816 main() would also need to return 0. */
15819 finish_function_body (tree compstmt
)
15821 if (compstmt
== NULL_TREE
)
15824 /* Close the block. */
15825 finish_compound_stmt (compstmt
);
15827 if (processing_template_decl
)
15828 /* Do nothing now. */;
15829 else if (DECL_CONSTRUCTOR_P (current_function_decl
))
15830 finish_constructor_body ();
15831 else if (DECL_DESTRUCTOR_P (current_function_decl
))
15832 finish_destructor_body ();
15835 /* Given a function, returns the BLOCK corresponding to the outermost level
15836 of curly braces, skipping the artificial block created for constructor
15840 outer_curly_brace_block (tree fndecl
)
15842 tree block
= DECL_INITIAL (fndecl
);
15843 if (BLOCK_OUTER_CURLY_BRACE_P (block
))
15845 block
= BLOCK_SUBBLOCKS (block
);
15846 if (BLOCK_OUTER_CURLY_BRACE_P (block
))
15848 block
= BLOCK_SUBBLOCKS (block
);
15849 gcc_assert (BLOCK_OUTER_CURLY_BRACE_P (block
));
15853 /* If FNDECL is a class's key method, add the class to the list of
15854 keyed classes that should be emitted. */
15857 record_key_method_defined (tree fndecl
)
15859 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fndecl
)
15860 && DECL_VIRTUAL_P (fndecl
)
15861 && !processing_template_decl
)
15863 tree fnclass
= DECL_CONTEXT (fndecl
);
15864 if (fndecl
== CLASSTYPE_KEY_METHOD (fnclass
))
15865 vec_safe_push (keyed_classes
, fnclass
);
15869 /* Subroutine of finish_function.
15870 Save the body of constexpr functions for possible
15871 future compile time evaluation. */
15874 maybe_save_function_definition (tree fun
)
15876 if (!processing_template_decl
15877 && DECL_DECLARED_CONSTEXPR_P (fun
)
15878 && !cp_function_chain
->invalid_constexpr
15879 && !DECL_CLONED_FUNCTION_P (fun
))
15880 register_constexpr_fundef (fun
, DECL_SAVED_TREE (fun
));
15883 /* Attempt to add a fix-it hint to RICHLOC suggesting the insertion
15884 of "return *this;" immediately before its location, using FNDECL's
15885 first statement (if any) to give the indentation, if appropriate. */
15888 add_return_star_this_fixit (gcc_rich_location
*richloc
, tree fndecl
)
15890 location_t indent
= UNKNOWN_LOCATION
;
15891 tree stmts
= expr_first (DECL_SAVED_TREE (fndecl
));
15893 indent
= EXPR_LOCATION (stmts
);
15894 richloc
->add_fixit_insert_formatted ("return *this;",
15895 richloc
->get_loc (),
15899 /* Finish up a function declaration and compile that function
15900 all the way to assembler language output. The free the storage
15901 for the function definition. INLINE_P is TRUE if we just
15902 finished processing the body of an in-class inline function
15903 definition. (This processing will have taken place after the
15904 class definition is complete.) */
15907 finish_function (bool inline_p
)
15909 tree fndecl
= current_function_decl
;
15910 tree fntype
, ctype
= NULL_TREE
;
15912 /* When we get some parse errors, we can end up without a
15913 current_function_decl, so cope. */
15914 if (fndecl
== NULL_TREE
)
15915 return error_mark_node
;
15917 finish_lambda_scope ();
15919 if (c_dialect_objc ())
15920 objc_finish_function ();
15922 record_key_method_defined (fndecl
);
15924 fntype
= TREE_TYPE (fndecl
);
15926 /* TREE_READONLY (fndecl) = 1;
15927 This caused &foo to be of type ptr-to-const-function
15928 which then got a warning when stored in a ptr-to-function variable. */
15930 gcc_assert (building_stmt_list_p ());
15931 /* The current function is being defined, so its DECL_INITIAL should
15932 be set, and unless there's a multiple definition, it should be
15933 error_mark_node. */
15934 gcc_assert (DECL_INITIAL (fndecl
) == error_mark_node
);
15936 /* For a cloned function, we've already got all the code we need;
15937 there's no need to add any extra bits. */
15938 if (!DECL_CLONED_FUNCTION_P (fndecl
))
15940 /* Make it so that `main' always returns 0 by default. */
15941 if (DECL_MAIN_P (current_function_decl
))
15942 finish_return_stmt (integer_zero_node
);
15944 if (use_eh_spec_block (current_function_decl
))
15945 finish_eh_spec_block (TYPE_RAISES_EXCEPTIONS
15946 (TREE_TYPE (current_function_decl
)),
15947 current_eh_spec_block
);
15950 /* If we're saving up tree structure, tie off the function now. */
15951 DECL_SAVED_TREE (fndecl
) = pop_stmt_list (DECL_SAVED_TREE (fndecl
));
15953 finish_fname_decls ();
15955 /* If this function can't throw any exceptions, remember that. */
15956 if (!processing_template_decl
15957 && !cp_function_chain
->can_throw
15958 && !flag_non_call_exceptions
15959 && !decl_replaceable_p (fndecl
))
15960 TREE_NOTHROW (fndecl
) = 1;
15962 /* This must come after expand_function_end because cleanups might
15963 have declarations (from inline functions) that need to go into
15964 this function's blocks. */
15966 /* If the current binding level isn't the outermost binding level
15967 for this function, either there is a bug, or we have experienced
15968 syntax errors and the statement tree is malformed. */
15969 if (current_binding_level
->kind
!= sk_function_parms
)
15971 /* Make sure we have already experienced errors. */
15972 gcc_assert (errorcount
);
15974 /* Throw away the broken statement tree and extra binding
15976 DECL_SAVED_TREE (fndecl
) = alloc_stmt_list ();
15978 while (current_binding_level
->kind
!= sk_function_parms
)
15980 if (current_binding_level
->kind
== sk_class
)
15981 pop_nested_class ();
15983 poplevel (0, 0, 0);
15986 poplevel (1, 0, 1);
15988 /* Statements should always be full-expressions at the outermost set
15989 of curly braces for a function. */
15990 gcc_assert (stmts_are_full_exprs_p ());
15992 /* If there are no return statements in a function with auto return type,
15993 the return type is void. But if the declared type is something like
15994 auto*, this is an error. */
15995 if (!processing_template_decl
&& FNDECL_USED_AUTO (fndecl
)
15996 && TREE_TYPE (fntype
) == current_function_auto_return_pattern
)
15998 if (is_auto (current_function_auto_return_pattern
))
16000 apply_deduced_return_type (fndecl
, void_type_node
);
16001 fntype
= TREE_TYPE (fndecl
);
16003 else if (!current_function_returns_value
16004 && !current_function_returns_null
)
16006 error ("no return statements in function returning %qT",
16007 current_function_auto_return_pattern
);
16008 inform (input_location
, "only plain %<auto%> return type can be "
16009 "deduced to %<void%>");
16013 // If this is a concept, check that the definition is reasonable.
16014 if (DECL_DECLARED_CONCEPT_P (fndecl
))
16015 check_function_concept (fndecl
);
16017 /* Lambda closure members are implicitly constexpr if possible. */
16018 if (cxx_dialect
>= cxx17
16019 && LAMBDA_TYPE_P (CP_DECL_CONTEXT (fndecl
)))
16020 DECL_DECLARED_CONSTEXPR_P (fndecl
)
16021 = ((processing_template_decl
16022 || is_valid_constexpr_fn (fndecl
, /*complain*/false))
16023 && potential_constant_expression (DECL_SAVED_TREE (fndecl
)));
16025 /* Save constexpr function body before it gets munged by
16026 the NRV transformation. */
16027 maybe_save_function_definition (fndecl
);
16029 /* Invoke the pre-genericize plugin before we start munging things. */
16030 if (!processing_template_decl
)
16031 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE
, fndecl
);
16033 /* Perform delayed folding before NRV transformation. */
16034 if (!processing_template_decl
)
16035 cp_fold_function (fndecl
);
16037 /* Set up the named return value optimization, if we can. Candidate
16038 variables are selected in check_return_expr. */
16039 if (current_function_return_value
)
16041 tree r
= current_function_return_value
;
16044 if (r
!= error_mark_node
16045 /* This is only worth doing for fns that return in memory--and
16046 simpler, since we don't have to worry about promoted modes. */
16047 && aggregate_value_p (TREE_TYPE (TREE_TYPE (fndecl
)), fndecl
)
16048 /* Only allow this for variables declared in the outer scope of
16049 the function so we know that their lifetime always ends with a
16050 return; see g++.dg/opt/nrv6.C. We could be more flexible if
16051 we were to do this optimization in tree-ssa. */
16052 && (outer
= outer_curly_brace_block (fndecl
))
16053 && chain_member (r
, BLOCK_VARS (outer
)))
16054 finalize_nrv (&DECL_SAVED_TREE (fndecl
), r
, DECL_RESULT (fndecl
));
16056 current_function_return_value
= NULL_TREE
;
16059 /* Remember that we were in class scope. */
16060 if (current_class_name
)
16061 ctype
= current_class_type
;
16063 /* Must mark the RESULT_DECL as being in this function. */
16064 DECL_CONTEXT (DECL_RESULT (fndecl
)) = fndecl
;
16066 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
16067 to the FUNCTION_DECL node itself. */
16068 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl
)) = fndecl
;
16070 /* Save away current state, if appropriate. */
16071 if (!processing_template_decl
)
16072 save_function_data (fndecl
);
16074 /* Complain if there's just no return statement. */
16075 if (warn_return_type
16076 && !VOID_TYPE_P (TREE_TYPE (fntype
))
16077 && !dependent_type_p (TREE_TYPE (fntype
))
16078 && !current_function_returns_value
&& !current_function_returns_null
16079 /* Don't complain if we abort or throw. */
16080 && !current_function_returns_abnormally
16081 /* Don't complain if there's an infinite loop. */
16082 && !current_function_infinite_loop
16083 /* Don't complain if we are declared noreturn. */
16084 && !TREE_THIS_VOLATILE (fndecl
)
16085 && !DECL_NAME (DECL_RESULT (fndecl
))
16086 && !TREE_NO_WARNING (fndecl
)
16087 /* Structor return values (if any) are set by the compiler. */
16088 && !DECL_CONSTRUCTOR_P (fndecl
)
16089 && !DECL_DESTRUCTOR_P (fndecl
)
16090 && targetm
.warn_func_return (fndecl
))
16092 gcc_rich_location
richloc (input_location
);
16093 /* Potentially add a "return *this;" fix-it hint for
16094 assignment operators. */
16095 if (IDENTIFIER_ASSIGN_OP_P (DECL_NAME (fndecl
)))
16097 tree valtype
= TREE_TYPE (DECL_RESULT (fndecl
));
16098 if (TREE_CODE (valtype
) == REFERENCE_TYPE
16099 && same_type_ignoring_top_level_qualifiers_p
16100 (TREE_TYPE (valtype
), TREE_TYPE (current_class_ref
)))
16101 if (global_dc
->option_enabled (OPT_Wreturn_type
,
16102 global_dc
->option_state
))
16103 add_return_star_this_fixit (&richloc
, fndecl
);
16105 warning_at (&richloc
, OPT_Wreturn_type
,
16106 "no return statement in function returning non-void");
16107 TREE_NO_WARNING (fndecl
) = 1;
16110 /* Store the end of the function, so that we get good line number
16111 info for the epilogue. */
16112 cfun
->function_end_locus
= input_location
;
16114 /* Complain about parameters that are only set, but never otherwise used. */
16115 if (warn_unused_but_set_parameter
16116 && !processing_template_decl
16117 && errorcount
== unused_but_set_errorcount
16118 && !DECL_CLONED_FUNCTION_P (fndecl
))
16122 for (decl
= DECL_ARGUMENTS (fndecl
);
16124 decl
= DECL_CHAIN (decl
))
16125 if (TREE_USED (decl
)
16126 && TREE_CODE (decl
) == PARM_DECL
16127 && !DECL_READ_P (decl
)
16128 && DECL_NAME (decl
)
16129 && !DECL_ARTIFICIAL (decl
)
16130 && !TREE_NO_WARNING (decl
)
16131 && !DECL_IN_SYSTEM_HEADER (decl
)
16132 && TREE_TYPE (decl
) != error_mark_node
16133 && !TYPE_REF_P (TREE_TYPE (decl
))
16134 && (!CLASS_TYPE_P (TREE_TYPE (decl
))
16135 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl
))))
16136 warning_at (DECL_SOURCE_LOCATION (decl
),
16137 OPT_Wunused_but_set_parameter
,
16138 "parameter %qD set but not used", decl
);
16139 unused_but_set_errorcount
= errorcount
;
16142 /* Complain about locally defined typedefs that are not used in this
16144 maybe_warn_unused_local_typedefs ();
16146 /* Possibly warn about unused parameters. */
16147 if (warn_unused_parameter
16148 && !processing_template_decl
16149 && !DECL_CLONED_FUNCTION_P (fndecl
))
16150 do_warn_unused_parameter (fndecl
);
16152 /* Genericize before inlining. */
16153 if (!processing_template_decl
)
16155 struct language_function
*f
= DECL_SAVED_FUNCTION_DATA (fndecl
);
16156 cp_genericize (fndecl
);
16157 /* Clear out the bits we don't need. */
16158 f
->x_current_class_ptr
= NULL
;
16159 f
->x_current_class_ref
= NULL
;
16160 f
->x_eh_spec_block
= NULL
;
16161 f
->x_in_charge_parm
= NULL
;
16162 f
->x_vtt_parm
= NULL
;
16163 f
->x_return_value
= NULL
;
16164 f
->bindings
= NULL
;
16165 f
->extern_decl_map
= NULL
;
16166 f
->infinite_loops
= NULL
;
16169 /* We're leaving the context of this function, so zap cfun. It's still in
16170 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
16172 current_function_decl
= NULL
;
16174 /* If this is an in-class inline definition, we may have to pop the
16175 bindings for the template parameters that we added in
16176 maybe_begin_member_template_processing when start_function was
16179 maybe_end_member_template_processing ();
16181 /* Leave the scope of the class. */
16183 pop_nested_class ();
16188 current_function_decl
= NULL_TREE
;
16190 invoke_plugin_callbacks (PLUGIN_FINISH_PARSE_FUNCTION
, fndecl
);
16194 /* Create the FUNCTION_DECL for a function definition.
16195 DECLSPECS and DECLARATOR are the parts of the declaration;
16196 they describe the return type and the name of the function,
16197 but twisted together in a fashion that parallels the syntax of C.
16199 This function creates a binding context for the function body
16200 as well as setting up the FUNCTION_DECL in current_function_decl.
16202 Returns a FUNCTION_DECL on success.
16204 If the DECLARATOR is not suitable for a function (it defines a datum
16205 instead), we return 0, which tells yyparse to report a parse error.
16207 May return void_type_node indicating that this method is actually
16208 a friend. See grokfield for more details.
16210 Came here with a `.pushlevel' .
16212 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
16213 CHANGES TO CODE IN `grokfield'. */
16216 grokmethod (cp_decl_specifier_seq
*declspecs
,
16217 const cp_declarator
*declarator
, tree attrlist
)
16219 tree fndecl
= grokdeclarator (declarator
, declspecs
, MEMFUNCDEF
, 0,
16222 if (fndecl
== error_mark_node
)
16223 return error_mark_node
;
16225 if (fndecl
== NULL
|| TREE_CODE (fndecl
) != FUNCTION_DECL
)
16227 error ("invalid member function declaration");
16228 return error_mark_node
;
16232 cplus_decl_attributes (&fndecl
, attrlist
, 0);
16234 /* Pass friends other than inline friend functions back. */
16235 if (fndecl
== void_type_node
)
16238 if (DECL_IN_AGGR_P (fndecl
))
16240 if (DECL_CLASS_SCOPE_P (fndecl
))
16241 error ("%qD is already defined in class %qT", fndecl
,
16242 DECL_CONTEXT (fndecl
));
16243 return error_mark_node
;
16246 check_template_shadow (fndecl
);
16248 if (TREE_PUBLIC (fndecl
))
16249 DECL_COMDAT (fndecl
) = 1;
16250 DECL_DECLARED_INLINE_P (fndecl
) = 1;
16251 DECL_NO_INLINE_WARNING_P (fndecl
) = 1;
16253 /* We process method specializations in finish_struct_1. */
16254 if (processing_template_decl
&& !DECL_TEMPLATE_SPECIALIZATION (fndecl
))
16256 fndecl
= push_template_decl (fndecl
);
16257 if (fndecl
== error_mark_node
)
16261 if (! DECL_FRIEND_P (fndecl
))
16263 if (DECL_CHAIN (fndecl
))
16265 fndecl
= copy_node (fndecl
);
16266 TREE_CHAIN (fndecl
) = NULL_TREE
;
16270 cp_finish_decl (fndecl
, NULL_TREE
, false, NULL_TREE
, 0);
16272 DECL_IN_AGGR_P (fndecl
) = 1;
16277 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
16278 we can lay it out later, when and if its type becomes complete.
16280 Also handle constexpr variables where the initializer involves
16281 an unlowered PTRMEM_CST because the class isn't complete yet. */
16284 maybe_register_incomplete_var (tree var
)
16286 gcc_assert (VAR_P (var
));
16288 /* Keep track of variables with incomplete types. */
16289 if (!processing_template_decl
&& TREE_TYPE (var
) != error_mark_node
16290 && DECL_EXTERNAL (var
))
16292 tree inner_type
= TREE_TYPE (var
);
16294 while (TREE_CODE (inner_type
) == ARRAY_TYPE
)
16295 inner_type
= TREE_TYPE (inner_type
);
16296 inner_type
= TYPE_MAIN_VARIANT (inner_type
);
16298 if ((!COMPLETE_TYPE_P (inner_type
) && CLASS_TYPE_P (inner_type
))
16299 /* RTTI TD entries are created while defining the type_info. */
16300 || (TYPE_LANG_SPECIFIC (inner_type
)
16301 && TYPE_BEING_DEFINED (inner_type
)))
16303 incomplete_var iv
= {var
, inner_type
};
16304 vec_safe_push (incomplete_vars
, iv
);
16306 else if (!(DECL_LANG_SPECIFIC (var
) && DECL_TEMPLATE_INFO (var
))
16307 && decl_constant_var_p (var
)
16308 && (TYPE_PTRMEM_P (inner_type
) || CLASS_TYPE_P (inner_type
)))
16310 /* When the outermost open class is complete we can resolve any
16311 pointers-to-members. */
16312 tree context
= outermost_open_class ();
16313 incomplete_var iv
= {var
, context
};
16314 vec_safe_push (incomplete_vars
, iv
);
16319 /* Called when a class type (given by TYPE) is defined. If there are
16320 any existing VAR_DECLs whose type has been completed by this
16321 declaration, update them now. */
16324 complete_vars (tree type
)
16327 incomplete_var
*iv
;
16329 for (ix
= 0; vec_safe_iterate (incomplete_vars
, ix
, &iv
); )
16331 if (same_type_p (type
, iv
->incomplete_type
))
16333 tree var
= iv
->decl
;
16334 tree type
= TREE_TYPE (var
);
16336 if (type
!= error_mark_node
16337 && (TYPE_MAIN_VARIANT (strip_array_types (type
))
16338 == iv
->incomplete_type
))
16340 /* Complete the type of the variable. The VAR_DECL itself
16341 will be laid out in expand_expr. */
16342 complete_type (type
);
16343 cp_apply_type_quals_to_decl (cp_type_quals (type
), var
);
16346 /* Remove this entry from the list. */
16347 incomplete_vars
->unordered_remove (ix
);
16353 /* Check for pending declarations which may have abstract type. */
16354 complete_type_check_abstract (type
);
16357 /* If DECL is of a type which needs a cleanup, build and return an
16358 expression to perform that cleanup here. Return NULL_TREE if no
16359 cleanup need be done. DECL can also be a _REF when called from
16360 split_nonconstant_init_1. */
16363 cxx_maybe_build_cleanup (tree decl
, tsubst_flags_t complain
)
16369 /* Assume no cleanup is required. */
16370 cleanup
= NULL_TREE
;
16372 if (error_operand_p (decl
))
16375 /* Handle "__attribute__((cleanup))". We run the cleanup function
16376 before the destructor since the destructor is what actually
16377 terminates the lifetime of the object. */
16379 attr
= lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl
));
16388 /* Get the name specified by the user for the cleanup function. */
16389 id
= TREE_VALUE (TREE_VALUE (attr
));
16390 /* Look up the name to find the cleanup function to call. It is
16391 important to use lookup_name here because that is what is
16392 used in c-common.c:handle_cleanup_attribute when performing
16393 initial checks on the attribute. Note that those checks
16394 include ensuring that the function found is not an overloaded
16395 function, or an object with an overloaded call operator,
16396 etc.; we can rely on the fact that the function found is an
16397 ordinary FUNCTION_DECL. */
16398 fn
= lookup_name (id
);
16399 arg
= build_address (decl
);
16400 if (!mark_used (decl
, complain
) && !(complain
& tf_error
))
16401 return error_mark_node
;
16402 cleanup
= cp_build_function_call_nary (fn
, complain
, arg
, NULL_TREE
);
16403 if (cleanup
== error_mark_node
)
16404 return error_mark_node
;
16406 /* Handle ordinary C++ destructors. */
16407 type
= TREE_TYPE (decl
);
16408 if (type_build_dtor_call (type
))
16410 int flags
= LOOKUP_NORMAL
|LOOKUP_NONVIRTUAL
|LOOKUP_DESTRUCTOR
;
16414 if (TREE_CODE (type
) == ARRAY_TYPE
)
16417 addr
= build_address (decl
);
16419 call
= build_delete (TREE_TYPE (addr
), addr
,
16420 sfk_complete_destructor
, flags
, 0, complain
);
16421 if (call
== error_mark_node
)
16422 cleanup
= error_mark_node
;
16423 else if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type
))
16424 /* Discard the call. */;
16426 cleanup
= cp_build_compound_expr (cleanup
, call
, complain
);
16431 /* build_delete sets the location of the destructor call to the
16432 current location, even though the destructor is going to be
16433 called later, at the end of the current scope. This can lead to
16434 a "jumpy" behavior for users of debuggers when they step around
16435 the end of the block. So let's unset the location of the
16436 destructor call instead. */
16437 protected_set_expr_location (cleanup
, UNKNOWN_LOCATION
);
16441 && !lookup_attribute ("warn_unused", TYPE_ATTRIBUTES (TREE_TYPE (decl
)))
16442 /* Treat objects with destructors as used; the destructor may do
16443 something substantive. */
16444 && !mark_used (decl
, complain
) && !(complain
& tf_error
))
16445 return error_mark_node
;
16451 /* Return the FUNCTION_TYPE that corresponds to MEMFNTYPE, which can be a
16452 FUNCTION_DECL, METHOD_TYPE, FUNCTION_TYPE, pointer or reference to
16453 METHOD_TYPE or FUNCTION_TYPE, or pointer to member function. */
16456 static_fn_type (tree memfntype
)
16461 if (TYPE_PTRMEMFUNC_P (memfntype
))
16462 memfntype
= TYPE_PTRMEMFUNC_FN_TYPE (memfntype
);
16463 if (INDIRECT_TYPE_P (memfntype
)
16464 || TREE_CODE (memfntype
) == FUNCTION_DECL
)
16465 memfntype
= TREE_TYPE (memfntype
);
16466 if (TREE_CODE (memfntype
) == FUNCTION_TYPE
)
16468 gcc_assert (TREE_CODE (memfntype
) == METHOD_TYPE
);
16469 args
= TYPE_ARG_TYPES (memfntype
);
16470 fntype
= build_function_type (TREE_TYPE (memfntype
), TREE_CHAIN (args
));
16471 fntype
= apply_memfn_quals (fntype
, type_memfn_quals (memfntype
));
16472 fntype
= (cp_build_type_attribute_variant
16473 (fntype
, TYPE_ATTRIBUTES (memfntype
)));
16474 fntype
= cxx_copy_lang_qualifiers (fntype
, memfntype
);
16478 /* DECL was originally constructed as a non-static member function,
16479 but turned out to be static. Update it accordingly. */
16482 revert_static_member_fn (tree decl
)
16484 tree stype
= static_fn_type (decl
);
16485 cp_cv_quals quals
= type_memfn_quals (stype
);
16486 cp_ref_qualifier rqual
= type_memfn_rqual (stype
);
16488 if (quals
!= TYPE_UNQUALIFIED
|| rqual
!= REF_QUAL_NONE
)
16489 stype
= apply_memfn_quals (stype
, TYPE_UNQUALIFIED
, REF_QUAL_NONE
);
16491 TREE_TYPE (decl
) = stype
;
16493 if (DECL_ARGUMENTS (decl
))
16494 DECL_ARGUMENTS (decl
) = DECL_CHAIN (DECL_ARGUMENTS (decl
));
16495 DECL_STATIC_FUNCTION_P (decl
) = 1;
16498 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
16499 one of the language-independent trees. */
16501 enum cp_tree_node_structure_enum
16502 cp_tree_node_structure (union lang_tree_node
* t
)
16504 switch (TREE_CODE (&t
->generic
))
16506 case DEFAULT_ARG
: return TS_CP_DEFAULT_ARG
;
16507 case DEFERRED_NOEXCEPT
: return TS_CP_DEFERRED_NOEXCEPT
;
16508 case IDENTIFIER_NODE
: return TS_CP_IDENTIFIER
;
16509 case OVERLOAD
: return TS_CP_OVERLOAD
;
16510 case TEMPLATE_PARM_INDEX
: return TS_CP_TPI
;
16511 case PTRMEM_CST
: return TS_CP_PTRMEM
;
16512 case BASELINK
: return TS_CP_BASELINK
;
16513 case TEMPLATE_DECL
: return TS_CP_TEMPLATE_DECL
;
16514 case STATIC_ASSERT
: return TS_CP_STATIC_ASSERT
;
16515 case ARGUMENT_PACK_SELECT
: return TS_CP_ARGUMENT_PACK_SELECT
;
16516 case TRAIT_EXPR
: return TS_CP_TRAIT_EXPR
;
16517 case LAMBDA_EXPR
: return TS_CP_LAMBDA_EXPR
;
16518 case TEMPLATE_INFO
: return TS_CP_TEMPLATE_INFO
;
16519 case CONSTRAINT_INFO
: return TS_CP_CONSTRAINT_INFO
;
16520 case USERDEF_LITERAL
: return TS_CP_USERDEF_LITERAL
;
16521 default: return TS_CP_GENERIC
;
16525 /* Build the void_list_node (void_type_node having been created). */
16527 build_void_list_node (void)
16529 tree t
= build_tree_list (NULL_TREE
, void_type_node
);
16534 cp_missing_noreturn_ok_p (tree decl
)
16536 /* A missing noreturn is ok for the `main' function. */
16537 return DECL_MAIN_P (decl
);
16540 /* Return the decl used to identify the COMDAT group into which DECL should
16544 cxx_comdat_group (tree decl
)
16546 /* Virtual tables, construction virtual tables, and virtual table
16547 tables all go in a single COMDAT group, named after the primary
16549 if (VAR_P (decl
) && DECL_VTABLE_OR_VTT_P (decl
))
16550 decl
= CLASSTYPE_VTABLES (DECL_CONTEXT (decl
));
16551 /* For all other DECLs, the COMDAT group is the mangled name of the
16552 declaration itself. */
16555 while (DECL_THUNK_P (decl
))
16557 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
16558 into the same section as the target function. In that case
16559 we must return target's name. */
16560 tree target
= THUNK_TARGET (decl
);
16561 if (TARGET_USE_LOCAL_THUNK_ALIAS_P (target
)
16562 && DECL_SECTION_NAME (target
) != NULL
16563 && DECL_ONE_ONLY (target
))
16573 /* Returns the return type for FN as written by the user, which may include
16574 a placeholder for a deduced return type. */
16577 fndecl_declared_return_type (tree fn
)
16579 fn
= STRIP_TEMPLATE (fn
);
16580 if (FNDECL_USED_AUTO (fn
))
16582 struct language_function
*f
= NULL
;
16583 if (DECL_STRUCT_FUNCTION (fn
))
16584 f
= DECL_STRUCT_FUNCTION (fn
)->language
;
16586 f
= DECL_SAVED_FUNCTION_DATA (fn
);
16587 return f
->x_auto_return_pattern
;
16589 return TREE_TYPE (TREE_TYPE (fn
));
16592 /* Returns true iff DECL is a variable or function declared with an auto type
16593 that has not yet been deduced to a real type. */
16596 undeduced_auto_decl (tree decl
)
16598 if (cxx_dialect
< cxx11
)
16600 STRIP_ANY_LOCATION_WRAPPER (decl
);
16601 return ((VAR_OR_FUNCTION_DECL_P (decl
)
16602 || TREE_CODE (decl
) == TEMPLATE_DECL
)
16603 && type_uses_auto (TREE_TYPE (decl
)));
16606 /* Complain if DECL has an undeduced return type. */
16609 require_deduced_type (tree decl
, tsubst_flags_t complain
)
16611 if (undeduced_auto_decl (decl
))
16613 if (complain
& tf_error
)
16614 error ("use of %qD before deduction of %<auto%>", decl
);
16620 /* Create a representation of the explicit-specifier with
16621 constant-expression of EXPR. COMPLAIN is as for tsubst. */
16624 build_explicit_specifier (tree expr
, tsubst_flags_t complain
)
16626 if (processing_template_decl
&& value_dependent_expression_p (expr
))
16627 /* Wait for instantiation, tsubst_function_decl will handle it. */
16630 expr
= build_converted_constant_expr (boolean_type_node
, expr
, complain
);
16631 expr
= instantiate_non_dependent_expr (expr
);
16632 expr
= cxx_constant_value (expr
);
16636 #include "gt-cp-decl.h"