1 /* Process declarations and variables for C++ compiler.
2 Copyright (C) 1988-2019 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 return pushdecl_top_level (decl
);
4541 return pushdecl (decl
);
4545 cxx_builtin_function (tree decl
)
4547 tree id
= DECL_NAME (decl
);
4548 const char *name
= IDENTIFIER_POINTER (id
);
4549 /* All builtins that don't begin with an '_' should additionally
4550 go in the 'std' namespace. */
4553 tree decl2
= copy_node(decl
);
4554 push_namespace (std_identifier
);
4555 builtin_function_1 (decl2
, std_node
, false);
4559 return builtin_function_1 (decl
, NULL_TREE
, false);
4562 /* Like cxx_builtin_function, but guarantee the function is added to the global
4563 scope. This is to allow function specific options to add new machine
4564 dependent builtins when the target ISA changes via attribute((target(...)))
4565 which saves space on program startup if the program does not use non-generic
4569 cxx_builtin_function_ext_scope (tree decl
)
4572 tree id
= DECL_NAME (decl
);
4573 const char *name
= IDENTIFIER_POINTER (id
);
4574 /* All builtins that don't begin with an '_' should additionally
4575 go in the 'std' namespace. */
4578 tree decl2
= copy_node(decl
);
4579 push_namespace (std_identifier
);
4580 builtin_function_1 (decl2
, std_node
, true);
4584 return builtin_function_1 (decl
, NULL_TREE
, true);
4587 /* Generate a FUNCTION_DECL with the typical flags for a runtime library
4588 function. Not called directly. */
4591 build_library_fn (tree name
, enum tree_code operator_code
, tree type
,
4594 tree fn
= build_lang_decl (FUNCTION_DECL
, name
, type
);
4595 DECL_EXTERNAL (fn
) = 1;
4596 TREE_PUBLIC (fn
) = 1;
4597 DECL_ARTIFICIAL (fn
) = 1;
4598 DECL_OVERLOADED_OPERATOR_CODE_RAW (fn
)
4599 = OVL_OP_INFO (false, operator_code
)->ovl_op_code
;
4600 SET_DECL_LANGUAGE (fn
, lang_c
);
4601 /* Runtime library routines are, by definition, available in an
4602 external shared object. */
4603 DECL_VISIBILITY (fn
) = VISIBILITY_DEFAULT
;
4604 DECL_VISIBILITY_SPECIFIED (fn
) = 1;
4605 set_call_expr_flags (fn
, ecf_flags
);
4609 /* Returns the _DECL for a library function with C++ linkage. */
4612 build_cp_library_fn (tree name
, enum tree_code operator_code
, tree type
,
4615 tree fn
= build_library_fn (name
, operator_code
, type
, ecf_flags
);
4616 DECL_CONTEXT (fn
) = FROB_CONTEXT (current_namespace
);
4617 SET_DECL_LANGUAGE (fn
, lang_cplusplus
);
4621 /* Like build_library_fn, but takes a C string instead of an
4625 build_library_fn_ptr (const char* name
, tree type
, int ecf_flags
)
4627 return build_library_fn (get_identifier (name
), ERROR_MARK
, type
, ecf_flags
);
4630 /* Like build_cp_library_fn, but takes a C string instead of an
4634 build_cp_library_fn_ptr (const char* name
, tree type
, int ecf_flags
)
4636 return build_cp_library_fn (get_identifier (name
), ERROR_MARK
, type
,
4640 /* Like build_library_fn, but also pushes the function so that we will
4641 be able to find it via get_global_binding. Also, the function
4642 may throw exceptions listed in RAISES. */
4645 push_library_fn (tree name
, tree type
, tree raises
, int ecf_flags
)
4650 type
= build_exception_variant (type
, raises
);
4652 fn
= build_library_fn (name
, ERROR_MARK
, type
, ecf_flags
);
4653 pushdecl_top_level (fn
);
4657 /* Like build_cp_library_fn, but also pushes the function so that it
4658 will be found by normal lookup. */
4661 push_cp_library_fn (enum tree_code operator_code
, tree type
,
4664 tree fn
= build_cp_library_fn (ovl_op_identifier (false, operator_code
),
4665 operator_code
, type
, ecf_flags
);
4668 apply_tm_attr (fn
, get_identifier ("transaction_safe"));
4672 /* Like push_library_fn, but takes a TREE_LIST of parm types rather than
4676 push_void_library_fn (tree name
, tree parmtypes
, int ecf_flags
)
4678 tree type
= build_function_type (void_type_node
, parmtypes
);
4679 return push_library_fn (name
, type
, NULL_TREE
, ecf_flags
);
4682 /* Like push_library_fn, but also note that this function throws
4683 and does not return. Used for __throw_foo and the like. */
4686 push_throw_library_fn (tree name
, tree type
)
4688 tree fn
= push_library_fn (name
, type
, NULL_TREE
, ECF_NORETURN
| ECF_COLD
);
4692 /* When we call finish_struct for an anonymous union, we create
4693 default copy constructors and such. But, an anonymous union
4694 shouldn't have such things; this function undoes the damage to the
4695 anonymous union type T.
4697 (The reason that we create the synthesized methods is that we don't
4698 distinguish `union { int i; }' from `typedef union { int i; } U'.
4699 The first is an anonymous union; the second is just an ordinary
4703 fixup_anonymous_aggr (tree t
)
4705 /* Wipe out memory of synthesized methods. */
4706 TYPE_HAS_USER_CONSTRUCTOR (t
) = 0;
4707 TYPE_HAS_DEFAULT_CONSTRUCTOR (t
) = 0;
4708 TYPE_HAS_COPY_CTOR (t
) = 0;
4709 TYPE_HAS_CONST_COPY_CTOR (t
) = 0;
4710 TYPE_HAS_COPY_ASSIGN (t
) = 0;
4711 TYPE_HAS_CONST_COPY_ASSIGN (t
) = 0;
4713 /* Splice the implicitly generated functions out of TYPE_FIELDS. */
4714 for (tree probe
, *prev_p
= &TYPE_FIELDS (t
); (probe
= *prev_p
);)
4715 if (TREE_CODE (probe
) == FUNCTION_DECL
&& DECL_ARTIFICIAL (probe
))
4716 *prev_p
= DECL_CHAIN (probe
);
4718 prev_p
= &DECL_CHAIN (probe
);
4720 /* Anonymous aggregates cannot have fields with ctors, dtors or complex
4721 assignment operators (because they cannot have these methods themselves).
4722 For anonymous unions this is already checked because they are not allowed
4723 in any union, otherwise we have to check it. */
4724 if (TREE_CODE (t
) != UNION_TYPE
)
4728 for (field
= TYPE_FIELDS (t
); field
; field
= DECL_CHAIN (field
))
4729 if (TREE_CODE (field
) == FIELD_DECL
)
4731 type
= TREE_TYPE (field
);
4732 if (CLASS_TYPE_P (type
))
4734 if (TYPE_NEEDS_CONSTRUCTING (type
))
4735 error ("member %q+#D with constructor not allowed "
4736 "in anonymous aggregate", field
);
4737 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type
))
4738 error ("member %q+#D with destructor not allowed "
4739 "in anonymous aggregate", field
);
4740 if (TYPE_HAS_COMPLEX_COPY_ASSIGN (type
))
4741 error ("member %q+#D with copy assignment operator "
4742 "not allowed in anonymous aggregate", field
);
4748 /* Warn for an attribute located at LOCATION that appertains to the
4749 class type CLASS_TYPE that has not been properly placed after its
4750 class-key, in it class-specifier. */
4753 warn_misplaced_attr_for_class_type (location_t location
,
4756 gcc_assert (OVERLOAD_TYPE_P (class_type
));
4758 auto_diagnostic_group d
;
4759 if (warning_at (location
, OPT_Wattributes
,
4760 "attribute ignored in declaration "
4761 "of %q#T", class_type
))
4763 "attribute for %q#T must follow the %qs keyword",
4764 class_type
, class_key_or_enum_as_string (class_type
));
4767 /* Make sure that a declaration with no declarator is well-formed, i.e.
4768 just declares a tagged type or anonymous union.
4770 Returns the type declared; or NULL_TREE if none. */
4773 check_tag_decl (cp_decl_specifier_seq
*declspecs
,
4774 bool explicit_type_instantiation_p
)
4776 int saw_friend
= decl_spec_seq_has_spec_p (declspecs
, ds_friend
);
4777 int saw_typedef
= decl_spec_seq_has_spec_p (declspecs
, ds_typedef
);
4778 /* If a class, struct, or enum type is declared by the DECLSPECS
4779 (i.e, if a class-specifier, enum-specifier, or non-typename
4780 elaborated-type-specifier appears in the DECLSPECS),
4781 DECLARED_TYPE is set to the corresponding type. */
4782 tree declared_type
= NULL_TREE
;
4783 bool error_p
= false;
4785 if (declspecs
->multiple_types_p
)
4786 error ("multiple types in one declaration");
4787 else if (declspecs
->redefined_builtin_type
)
4789 if (!in_system_header_at (input_location
))
4790 permerror (declspecs
->locations
[ds_redefined_builtin_type_spec
],
4791 "redeclaration of C++ built-in type %qT",
4792 declspecs
->redefined_builtin_type
);
4797 && TYPE_P (declspecs
->type
)
4798 && ((TREE_CODE (declspecs
->type
) != TYPENAME_TYPE
4799 && MAYBE_CLASS_TYPE_P (declspecs
->type
))
4800 || TREE_CODE (declspecs
->type
) == ENUMERAL_TYPE
))
4801 declared_type
= declspecs
->type
;
4802 else if (declspecs
->type
== error_mark_node
)
4805 if (type_uses_auto (declared_type
))
4807 error_at (declspecs
->locations
[ds_type_spec
],
4808 "%<auto%> can only be specified for variables "
4809 "or function declarations");
4810 return error_mark_node
;
4813 if (declared_type
&& !OVERLOAD_TYPE_P (declared_type
))
4814 declared_type
= NULL_TREE
;
4816 if (!declared_type
&& !saw_friend
&& !error_p
)
4817 permerror (input_location
, "declaration does not declare anything");
4818 /* Check for an anonymous union. */
4819 else if (declared_type
&& RECORD_OR_UNION_CODE_P (TREE_CODE (declared_type
))
4820 && TYPE_UNNAMED_P (declared_type
))
4822 /* 7/3 In a simple-declaration, the optional init-declarator-list
4823 can be omitted only when declaring a class (clause 9) or
4824 enumeration (7.2), that is, when the decl-specifier-seq contains
4825 either a class-specifier, an elaborated-type-specifier with
4826 a class-key (9.1), or an enum-specifier. In these cases and
4827 whenever a class-specifier or enum-specifier is present in the
4828 decl-specifier-seq, the identifiers in these specifiers are among
4829 the names being declared by the declaration (as class-name,
4830 enum-names, or enumerators, depending on the syntax). In such
4831 cases, and except for the declaration of an unnamed bit-field (9.6),
4832 the decl-specifier-seq shall introduce one or more names into the
4833 program, or shall redeclare a name introduced by a previous
4834 declaration. [Example:
4835 enum { }; // ill-formed
4836 typedef class { }; // ill-formed
4840 error ("missing type-name in typedef-declaration");
4843 /* Anonymous unions are objects, so they can have specifiers. */;
4844 SET_ANON_AGGR_TYPE_P (declared_type
);
4846 if (TREE_CODE (declared_type
) != UNION_TYPE
4847 && !in_system_header_at (input_location
))
4848 pedwarn (input_location
, OPT_Wpedantic
, "ISO C++ prohibits anonymous structs");
4853 if (decl_spec_seq_has_spec_p (declspecs
, ds_inline
))
4854 error_at (declspecs
->locations
[ds_inline
],
4855 "%<inline%> can only be specified for functions");
4856 else if (decl_spec_seq_has_spec_p (declspecs
, ds_virtual
))
4857 error_at (declspecs
->locations
[ds_virtual
],
4858 "%<virtual%> can only be specified for functions");
4860 && (!current_class_type
4861 || current_scope () != current_class_type
))
4862 error_at (declspecs
->locations
[ds_friend
],
4863 "%<friend%> can only be specified inside a class");
4864 else if (decl_spec_seq_has_spec_p (declspecs
, ds_explicit
))
4865 error_at (declspecs
->locations
[ds_explicit
],
4866 "%<explicit%> can only be specified for constructors");
4867 else if (declspecs
->storage_class
)
4868 error_at (declspecs
->locations
[ds_storage_class
],
4869 "a storage class can only be specified for objects "
4871 else if (decl_spec_seq_has_spec_p (declspecs
, ds_const
))
4872 error_at (declspecs
->locations
[ds_const
],
4873 "%<const%> can only be specified for objects and "
4875 else if (decl_spec_seq_has_spec_p (declspecs
, ds_volatile
))
4876 error_at (declspecs
->locations
[ds_volatile
],
4877 "%<volatile%> can only be specified for objects and "
4879 else if (decl_spec_seq_has_spec_p (declspecs
, ds_restrict
))
4880 error_at (declspecs
->locations
[ds_restrict
],
4881 "%<__restrict%> can only be specified for objects and "
4883 else if (decl_spec_seq_has_spec_p (declspecs
, ds_thread
))
4884 error_at (declspecs
->locations
[ds_thread
],
4885 "%<__thread%> can only be specified for objects "
4887 else if (saw_typedef
)
4888 warning_at (declspecs
->locations
[ds_typedef
], 0,
4889 "%<typedef%> was ignored in this declaration");
4890 else if (decl_spec_seq_has_spec_p (declspecs
, ds_constexpr
))
4891 error_at (declspecs
->locations
[ds_constexpr
],
4892 "%<constexpr%> cannot be used for type declarations");
4895 if (declspecs
->attributes
&& warn_attributes
&& declared_type
)
4898 if (!CLASS_TYPE_P (declared_type
)
4899 || !CLASSTYPE_TEMPLATE_INSTANTIATION (declared_type
))
4900 /* For a non-template class, use the name location. */
4901 loc
= location_of (declared_type
);
4903 /* For a template class (an explicit instantiation), use the
4904 current location. */
4905 loc
= input_location
;
4907 if (explicit_type_instantiation_p
)
4908 /* [dcl.attr.grammar]/4:
4910 No attribute-specifier-seq shall appertain to an explicit
4913 if (warning_at (loc
, OPT_Wattributes
,
4914 "attribute ignored in explicit instantiation %q#T",
4917 "no attribute can be applied to "
4918 "an explicit instantiation");
4921 warn_misplaced_attr_for_class_type (loc
, declared_type
);
4924 return declared_type
;
4927 /* Called when a declaration is seen that contains no names to declare.
4928 If its type is a reference to a structure, union or enum inherited
4929 from a containing scope, shadow that tag name for the current scope
4930 with a forward reference.
4931 If its type defines a new named structure or union
4932 or defines an enum, it is valid but we need not do anything here.
4933 Otherwise, it is an error.
4935 C++: may have to grok the declspecs to learn about static,
4936 complain for anonymous unions.
4938 Returns the TYPE declared -- or NULL_TREE if none. */
4941 shadow_tag (cp_decl_specifier_seq
*declspecs
)
4943 tree t
= check_tag_decl (declspecs
,
4944 /*explicit_type_instantiation_p=*/false);
4949 if (maybe_process_partial_specialization (t
) == error_mark_node
)
4952 /* This is where the variables in an anonymous union are
4953 declared. An anonymous union declaration looks like:
4955 because there is no declarator after the union, the parser
4956 sends that declaration here. */
4957 if (ANON_AGGR_TYPE_P (t
))
4959 fixup_anonymous_aggr (t
);
4961 if (TYPE_FIELDS (t
))
4963 tree decl
= grokdeclarator (/*declarator=*/NULL
,
4964 declspecs
, NORMAL
, 0, NULL
);
4965 finish_anon_union (decl
);
4972 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
4975 groktypename (cp_decl_specifier_seq
*type_specifiers
,
4976 const cp_declarator
*declarator
,
4977 bool is_template_arg
)
4981 enum decl_context context
4982 = is_template_arg
? TEMPLATE_TYPE_ARG
: TYPENAME
;
4983 attrs
= type_specifiers
->attributes
;
4984 type_specifiers
->attributes
= NULL_TREE
;
4985 type
= grokdeclarator (declarator
, type_specifiers
, context
, 0, &attrs
);
4986 if (attrs
&& type
!= error_mark_node
)
4988 if (CLASS_TYPE_P (type
))
4989 warning (OPT_Wattributes
, "ignoring attributes applied to class type %qT "
4990 "outside of definition", type
);
4991 else if (MAYBE_CLASS_TYPE_P (type
))
4992 /* A template type parameter or other dependent type. */
4993 warning (OPT_Wattributes
, "ignoring attributes applied to dependent "
4994 "type %qT without an associated declaration", type
);
4996 cplus_decl_attributes (&type
, attrs
, 0);
5001 /* Process a DECLARATOR for a function-scope variable declaration,
5002 namespace-scope variable declaration, or function declaration.
5003 (Function definitions go through start_function; class member
5004 declarations appearing in the body of the class go through
5005 grokfield.) The DECL corresponding to the DECLARATOR is returned.
5006 If an error occurs, the error_mark_node is returned instead.
5008 DECLSPECS are the decl-specifiers for the declaration. INITIALIZED is
5009 SD_INITIALIZED if an explicit initializer is present, or SD_DEFAULTED
5010 for an explicitly defaulted function, or SD_DELETED for an explicitly
5011 deleted function, but 0 (SD_UNINITIALIZED) if this is a variable
5012 implicitly initialized via a default constructor. ATTRIBUTES and
5013 PREFIX_ATTRIBUTES are GNU attributes associated with this declaration.
5015 The scope represented by the context of the returned DECL is pushed
5016 (if it is not the global namespace) and is assigned to
5017 *PUSHED_SCOPE_P. The caller is then responsible for calling
5018 pop_scope on *PUSHED_SCOPE_P if it is set. */
5021 start_decl (const cp_declarator
*declarator
,
5022 cp_decl_specifier_seq
*declspecs
,
5025 tree prefix_attributes
,
5026 tree
*pushed_scope_p
)
5034 *pushed_scope_p
= NULL_TREE
;
5036 /* An object declared as __attribute__((deprecated)) suppresses
5037 warnings of uses of other deprecated items. */
5038 if (lookup_attribute ("deprecated", attributes
))
5039 deprecated_state
= DEPRECATED_SUPPRESS
;
5041 attributes
= chainon (attributes
, prefix_attributes
);
5043 decl
= grokdeclarator (declarator
, declspecs
, NORMAL
, initialized
,
5046 deprecated_state
= DEPRECATED_NORMAL
;
5048 if (decl
== NULL_TREE
|| VOID_TYPE_P (decl
)
5049 || decl
== error_mark_node
)
5050 return error_mark_node
;
5052 context
= CP_DECL_CONTEXT (decl
);
5053 if (context
!= global_namespace
)
5054 *pushed_scope_p
= push_scope (context
);
5056 /* Is it valid for this decl to have an initializer at all?
5057 If not, set INITIALIZED to zero, which will indirectly
5058 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
5060 && TREE_CODE (decl
) == TYPE_DECL
)
5062 error ("typedef %qD is initialized (use decltype instead)", decl
);
5063 return error_mark_node
;
5068 if (! toplevel_bindings_p ()
5069 && DECL_EXTERNAL (decl
))
5070 warning (0, "declaration of %q#D has %<extern%> and is initialized",
5072 DECL_EXTERNAL (decl
) = 0;
5073 if (toplevel_bindings_p ())
5074 TREE_STATIC (decl
) = 1;
5076 alias
= lookup_attribute ("alias", DECL_ATTRIBUTES (decl
)) != 0;
5078 if (alias
&& TREE_CODE (decl
) == FUNCTION_DECL
)
5079 record_key_method_defined (decl
);
5081 /* If this is a typedef that names the class for linkage purposes
5082 (7.1.3p8), apply any attributes directly to the type. */
5083 if (TREE_CODE (decl
) == TYPE_DECL
5084 && OVERLOAD_TYPE_P (TREE_TYPE (decl
))
5085 && decl
== TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (decl
))))
5086 flags
= ATTR_FLAG_TYPE_IN_PLACE
;
5090 /* Set attributes here so if duplicate decl, will have proper attributes. */
5091 cplus_decl_attributes (&decl
, attributes
, flags
);
5093 /* Dllimported symbols cannot be defined. Static data members (which
5094 can be initialized in-class and dllimported) go through grokfield,
5095 not here, so we don't need to exclude those decls when checking for
5097 if (initialized
&& DECL_DLLIMPORT_P (decl
))
5099 error ("definition of %q#D is marked %<dllimport%>", decl
);
5100 DECL_DLLIMPORT_P (decl
) = 0;
5103 /* If #pragma weak was used, mark the decl weak now. */
5104 if (!processing_template_decl
&& !DECL_DECOMPOSITION_P (decl
))
5105 maybe_apply_pragma_weak (decl
);
5107 if (TREE_CODE (decl
) == FUNCTION_DECL
5108 && DECL_DECLARED_INLINE_P (decl
)
5109 && DECL_UNINLINABLE (decl
)
5110 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl
)))
5111 warning_at (DECL_SOURCE_LOCATION (decl
), 0,
5112 "inline function %qD given attribute noinline", decl
);
5114 if (TYPE_P (context
) && COMPLETE_TYPE_P (complete_type (context
)))
5116 bool this_tmpl
= (processing_template_decl
5117 > template_class_depth (context
));
5120 tree field
= lookup_field (context
, DECL_NAME (decl
), 0, false);
5121 if (field
== NULL_TREE
5122 || !(VAR_P (field
) || variable_template_p (field
)))
5123 error ("%q+#D is not a static data member of %q#T", decl
, context
);
5124 else if (variable_template_p (field
)
5125 && (DECL_LANG_SPECIFIC (decl
)
5126 && DECL_TEMPLATE_SPECIALIZATION (decl
)))
5127 /* OK, specialization was already checked. */;
5128 else if (variable_template_p (field
) && !this_tmpl
)
5130 error_at (DECL_SOURCE_LOCATION (decl
),
5131 "non-member-template declaration of %qD", decl
);
5132 inform (DECL_SOURCE_LOCATION (field
), "does not match "
5133 "member template declaration here");
5134 return error_mark_node
;
5138 if (variable_template_p (field
))
5139 field
= DECL_TEMPLATE_RESULT (field
);
5141 if (DECL_CONTEXT (field
) != context
)
5143 if (!same_type_p (DECL_CONTEXT (field
), context
))
5144 permerror (input_location
, "ISO C++ does not permit %<%T::%D%> "
5145 "to be defined as %<%T::%D%>",
5146 DECL_CONTEXT (field
), DECL_NAME (decl
),
5147 context
, DECL_NAME (decl
));
5148 DECL_CONTEXT (decl
) = DECL_CONTEXT (field
);
5150 /* Static data member are tricky; an in-class initialization
5151 still doesn't provide a definition, so the in-class
5152 declaration will have DECL_EXTERNAL set, but will have an
5153 initialization. Thus, duplicate_decls won't warn
5154 about this situation, and so we check here. */
5155 if (initialized
&& DECL_INITIALIZED_IN_CLASS_P (field
))
5156 error ("duplicate initialization of %qD", decl
);
5157 field
= duplicate_decls (decl
, field
,
5158 /*newdecl_is_friend=*/false);
5159 if (field
== error_mark_node
)
5160 return error_mark_node
;
5167 tree field
= check_classfn (context
, decl
,
5169 ? current_template_parms
5171 if (field
&& field
!= error_mark_node
5172 && duplicate_decls (decl
, field
,
5173 /*newdecl_is_friend=*/false))
5177 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
5178 DECL_IN_AGGR_P (decl
) = 0;
5179 /* Do not mark DECL as an explicit specialization if it was not
5180 already marked as an instantiation; a declaration should
5181 never be marked as a specialization unless we know what
5182 template is being specialized. */
5183 if (DECL_LANG_SPECIFIC (decl
) && DECL_USE_TEMPLATE (decl
))
5185 SET_DECL_TEMPLATE_SPECIALIZATION (decl
);
5186 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5187 DECL_COMDAT (decl
) = (TREE_PUBLIC (decl
)
5188 && DECL_DECLARED_INLINE_P (decl
));
5190 DECL_COMDAT (decl
) = false;
5192 /* [temp.expl.spec] An explicit specialization of a static data
5193 member of a template is a definition if the declaration
5194 includes an initializer; otherwise, it is a declaration.
5196 We check for processing_specialization so this only applies
5197 to the new specialization syntax. */
5198 if (!initialized
&& processing_specialization
)
5199 DECL_EXTERNAL (decl
) = 1;
5202 if (DECL_EXTERNAL (decl
) && ! DECL_TEMPLATE_SPECIALIZATION (decl
)
5203 /* Aliases are definitions. */
5205 permerror (declarator
->id_loc
,
5206 "declaration of %q#D outside of class is not definition",
5210 was_public
= TREE_PUBLIC (decl
);
5212 /* Enter this declaration into the symbol table. Don't push the plain
5213 VAR_DECL for a variable template. */
5214 if (!template_parm_scope_p ()
5216 decl
= maybe_push_decl (decl
);
5218 if (processing_template_decl
)
5219 decl
= push_template_decl (decl
);
5220 if (decl
== error_mark_node
)
5221 return error_mark_node
;
5224 && DECL_NAMESPACE_SCOPE_P (decl
) && !TREE_PUBLIC (decl
) && !was_public
5225 && !DECL_THIS_STATIC (decl
) && !DECL_ARTIFICIAL (decl
))
5227 /* This is a const variable with implicit 'static'. Set
5228 DECL_THIS_STATIC so we can tell it from variables that are
5229 !TREE_PUBLIC because of the anonymous namespace. */
5230 gcc_assert (CP_TYPE_CONST_P (TREE_TYPE (decl
)) || errorcount
);
5231 DECL_THIS_STATIC (decl
) = 1;
5234 if (current_function_decl
&& VAR_P (decl
)
5235 && DECL_DECLARED_CONSTEXPR_P (current_function_decl
))
5238 if (CP_DECL_THREAD_LOCAL_P (decl
))
5239 error_at (DECL_SOURCE_LOCATION (decl
),
5240 "%qD declared %<thread_local%> in %<constexpr%> function",
5242 else if (TREE_STATIC (decl
))
5243 error_at (DECL_SOURCE_LOCATION (decl
),
5244 "%qD declared %<static%> in %<constexpr%> function", decl
);
5248 cp_function_chain
->invalid_constexpr
= true;
5251 if (!processing_template_decl
&& VAR_P (decl
))
5252 start_decl_1 (decl
, initialized
);
5257 /* Process the declaration of a variable DECL. INITIALIZED is true
5258 iff DECL is explicitly initialized. (INITIALIZED is false if the
5259 variable is initialized via an implicitly-called constructor.)
5260 This function must be called for ordinary variables (including, for
5261 example, implicit instantiations of templates), but must not be
5262 called for template declarations. */
5265 start_decl_1 (tree decl
, bool initialized
)
5269 bool aggregate_definition_p
;
5271 gcc_assert (!processing_template_decl
);
5273 if (error_operand_p (decl
))
5276 gcc_assert (VAR_P (decl
));
5278 type
= TREE_TYPE (decl
);
5279 complete_p
= COMPLETE_TYPE_P (type
);
5280 aggregate_definition_p
= MAYBE_CLASS_TYPE_P (type
) && !DECL_EXTERNAL (decl
);
5282 /* If an explicit initializer is present, or if this is a definition
5283 of an aggregate, then we need a complete type at this point.
5284 (Scalars are always complete types, so there is nothing to
5285 check.) This code just sets COMPLETE_P; errors (if necessary)
5286 are issued below. */
5287 if ((initialized
|| aggregate_definition_p
)
5289 && COMPLETE_TYPE_P (complete_type (type
)))
5292 /* We will not yet have set TREE_READONLY on DECL if the type
5293 was "const", but incomplete, before this point. But, now, we
5294 have a complete type, so we can try again. */
5295 cp_apply_type_quals_to_decl (cp_type_quals (type
), decl
);
5299 /* Is it valid for this decl to have an initializer at all? */
5301 /* Don't allow initializations for incomplete types except for
5302 arrays which might be completed by the initialization. */
5304 ; /* A complete type is ok. */
5305 else if (type_uses_auto (type
))
5306 ; /* An auto type is ok. */
5307 else if (TREE_CODE (type
) != ARRAY_TYPE
)
5309 error ("variable %q#D has initializer but incomplete type", decl
);
5310 type
= TREE_TYPE (decl
) = error_mark_node
;
5312 else if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type
))))
5314 if (DECL_LANG_SPECIFIC (decl
) && DECL_TEMPLATE_INFO (decl
))
5315 error ("elements of array %q#D have incomplete type", decl
);
5316 /* else we already gave an error in start_decl. */
5319 else if (aggregate_definition_p
&& !complete_p
)
5321 if (type_uses_auto (type
))
5322 gcc_assert (CLASS_PLACEHOLDER_TEMPLATE (type
));
5325 error ("aggregate %q#D has incomplete type and cannot be defined",
5327 /* Change the type so that assemble_variable will give
5328 DECL an rtl we can live with: (mem (const_int 0)). */
5329 type
= TREE_TYPE (decl
) = error_mark_node
;
5333 /* Create a new scope to hold this declaration if necessary.
5334 Whether or not a new scope is necessary cannot be determined
5335 until after the type has been completed; if the type is a
5336 specialization of a class template it is not until after
5337 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
5338 will be set correctly. */
5339 maybe_push_cleanup_level (type
);
5342 /* Handle initialization of references. DECL, TYPE, and INIT have the
5343 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
5344 but will be set to a new CLEANUP_STMT if a temporary is created
5345 that must be destroyed subsequently.
5347 Returns an initializer expression to use to initialize DECL, or
5348 NULL if the initialization can be performed statically.
5350 Quotes on semantics can be found in ARM 8.4.3. */
5353 grok_reference_init (tree decl
, tree type
, tree init
, int flags
)
5355 if (init
== NULL_TREE
)
5357 if ((DECL_LANG_SPECIFIC (decl
) == 0
5358 || DECL_IN_AGGR_P (decl
) == 0)
5359 && ! DECL_THIS_EXTERN (decl
))
5360 error ("%qD declared as reference but not initialized", decl
);
5364 if (TREE_CODE (init
) == TREE_LIST
)
5365 init
= build_x_compound_expr_from_list (init
, ELK_INIT
,
5366 tf_warning_or_error
);
5368 tree ttype
= TREE_TYPE (type
);
5369 if (TREE_CODE (ttype
) != ARRAY_TYPE
5370 && TREE_CODE (TREE_TYPE (init
)) == ARRAY_TYPE
)
5371 /* Note: default conversion is only called in very special cases. */
5372 init
= decay_conversion (init
, tf_warning_or_error
);
5374 /* check_initializer handles this for non-reference variables, but for
5375 references we need to do it here or the initializer will get the
5376 incomplete array type and confuse later calls to
5377 cp_complete_array_type. */
5378 if (TREE_CODE (ttype
) == ARRAY_TYPE
5379 && TYPE_DOMAIN (ttype
) == NULL_TREE
5380 && (BRACE_ENCLOSED_INITIALIZER_P (init
)
5381 || TREE_CODE (init
) == STRING_CST
))
5383 cp_complete_array_type (&ttype
, init
, false);
5384 if (ttype
!= TREE_TYPE (type
))
5385 type
= cp_build_reference_type (ttype
, TYPE_REF_IS_RVALUE (type
));
5388 /* Convert INIT to the reference type TYPE. This may involve the
5389 creation of a temporary, whose lifetime must be the same as that
5390 of the reference. If so, a DECL_EXPR for the temporary will be
5391 added just after the DECL_EXPR for DECL. That's why we don't set
5392 DECL_INITIAL for local references (instead assigning to them
5393 explicitly); we need to allow the temporary to be initialized
5395 return initialize_reference (type
, init
, flags
,
5396 tf_warning_or_error
);
5399 /* Designated initializers in arrays are not supported in GNU C++.
5400 The parser cannot detect this error since it does not know whether
5401 a given brace-enclosed initializer is for a class type or for an
5402 array. This function checks that CE does not use a designated
5403 initializer. If it does, an error is issued. Returns true if CE
5404 is valid, i.e., does not have a designated initializer. */
5407 check_array_designated_initializer (constructor_elt
*ce
,
5408 unsigned HOST_WIDE_INT index
)
5410 /* Designated initializers for array elements are not supported. */
5413 /* The parser only allows identifiers as designated
5415 if (ce
->index
== error_mark_node
)
5417 error ("name used in a GNU-style designated "
5418 "initializer for an array");
5421 else if (identifier_p (ce
->index
))
5423 error ("name %qD used in a GNU-style designated "
5424 "initializer for an array", ce
->index
);
5428 tree ce_index
= build_expr_type_conversion (WANT_INT
| WANT_ENUM
,
5431 && INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (ce_index
))
5432 && (TREE_CODE (ce_index
= fold_non_dependent_expr (ce_index
))
5435 /* A C99 designator is OK if it matches the current index. */
5436 if (wi::to_wide (ce_index
) == index
)
5438 ce
->index
= ce_index
;
5442 sorry ("non-trivial designated initializers not supported");
5445 error ("C99 designator %qE is not an integral constant-expression",
5454 /* When parsing `int a[] = {1, 2};' we don't know the size of the
5455 array until we finish parsing the initializer. If that's the
5456 situation we're in, update DECL accordingly. */
5459 maybe_deduce_size_from_array_init (tree decl
, tree init
)
5461 tree type
= TREE_TYPE (decl
);
5463 if (TREE_CODE (type
) == ARRAY_TYPE
5464 && TYPE_DOMAIN (type
) == NULL_TREE
5465 && TREE_CODE (decl
) != TYPE_DECL
)
5467 /* do_default is really a C-ism to deal with tentative definitions.
5468 But let's leave it here to ease the eventual merge. */
5469 int do_default
= !DECL_EXTERNAL (decl
);
5470 tree initializer
= init
? init
: DECL_INITIAL (decl
);
5473 /* Check that there are no designated initializers in INIT, as
5474 those are not supported in GNU C++, and as the middle-end
5475 will crash if presented with a non-numeric designated
5477 if (initializer
&& BRACE_ENCLOSED_INITIALIZER_P (initializer
))
5479 vec
<constructor_elt
, va_gc
> *v
= CONSTRUCTOR_ELTS (initializer
);
5480 constructor_elt
*ce
;
5482 FOR_EACH_VEC_SAFE_ELT (v
, i
, ce
)
5484 if (instantiation_dependent_expression_p (ce
->index
))
5486 if (!check_array_designated_initializer (ce
, i
))
5492 TREE_TYPE (decl
) = error_mark_node
;
5495 failure
= cp_complete_array_type (&TREE_TYPE (decl
), initializer
,
5499 error_at (cp_expr_loc_or_loc (initializer
,
5500 DECL_SOURCE_LOCATION (decl
)),
5501 "initializer fails to determine size of %qD", decl
);
5503 else if (failure
== 2)
5507 error_at (DECL_SOURCE_LOCATION (decl
),
5508 "array size missing in %qD", decl
);
5510 /* If a `static' var's size isn't known, make it extern as
5511 well as static, so it does not get allocated. If it's not
5512 `static', then don't mark it extern; finish_incomplete_decl
5513 will give it a default size and it will get allocated. */
5514 else if (!pedantic
&& TREE_STATIC (decl
) && !TREE_PUBLIC (decl
))
5515 DECL_EXTERNAL (decl
) = 1;
5517 else if (failure
== 3)
5519 error_at (DECL_SOURCE_LOCATION (decl
),
5520 "zero-size array %qD", decl
);
5524 cp_apply_type_quals_to_decl (cp_type_quals (TREE_TYPE (decl
)), decl
);
5526 relayout_decl (decl
);
5530 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
5531 any appropriate error messages regarding the layout. */
5534 layout_var_decl (tree decl
)
5538 type
= TREE_TYPE (decl
);
5539 if (type
== error_mark_node
)
5542 /* If we haven't already laid out this declaration, do so now.
5543 Note that we must not call complete type for an external object
5544 because it's type might involve templates that we are not
5545 supposed to instantiate yet. (And it's perfectly valid to say
5546 `extern X x' for some incomplete type `X'.) */
5547 if (!DECL_EXTERNAL (decl
))
5548 complete_type (type
);
5549 if (!DECL_SIZE (decl
)
5550 && TREE_TYPE (decl
) != error_mark_node
5551 && complete_or_array_type_p (type
))
5552 layout_decl (decl
, 0);
5554 if (!DECL_EXTERNAL (decl
) && DECL_SIZE (decl
) == NULL_TREE
)
5556 /* An automatic variable with an incomplete type: that is an error.
5557 Don't talk about array types here, since we took care of that
5558 message in grokdeclarator. */
5559 error_at (DECL_SOURCE_LOCATION (decl
),
5560 "storage size of %qD isn%'t known", decl
);
5561 TREE_TYPE (decl
) = error_mark_node
;
5564 /* Keep this code around in case we later want to control debug info
5565 based on whether a type is "used". (jason 1999-11-11) */
5567 else if (!DECL_EXTERNAL (decl
) && MAYBE_CLASS_TYPE_P (ttype
))
5568 /* Let debugger know it should output info for this type. */
5569 note_debug_info_needed (ttype
);
5571 if (TREE_STATIC (decl
) && DECL_CLASS_SCOPE_P (decl
))
5572 note_debug_info_needed (DECL_CONTEXT (decl
));
5575 if ((DECL_EXTERNAL (decl
) || TREE_STATIC (decl
))
5576 && DECL_SIZE (decl
) != NULL_TREE
5577 && ! TREE_CONSTANT (DECL_SIZE (decl
)))
5579 if (TREE_CODE (DECL_SIZE (decl
)) == INTEGER_CST
)
5580 constant_expression_warning (DECL_SIZE (decl
));
5583 error_at (DECL_SOURCE_LOCATION (decl
),
5584 "storage size of %qD isn%'t constant", decl
);
5585 TREE_TYPE (decl
) = error_mark_node
;
5590 /* If a local static variable is declared in an inline function, or if
5591 we have a weak definition, we must endeavor to create only one
5592 instance of the variable at link-time. */
5595 maybe_commonize_var (tree decl
)
5597 /* Don't mess with __FUNCTION__ and similar. */
5598 if (DECL_ARTIFICIAL (decl
))
5601 /* Static data in a function with comdat linkage also has comdat
5603 if ((TREE_STATIC (decl
)
5604 && DECL_FUNCTION_SCOPE_P (decl
)
5605 && vague_linkage_p (DECL_CONTEXT (decl
)))
5606 || (TREE_PUBLIC (decl
) && DECL_INLINE_VAR_P (decl
)))
5610 /* With weak symbols, we simply make the variable COMDAT;
5611 that will cause copies in multiple translations units to
5613 comdat_linkage (decl
);
5617 if (DECL_INITIAL (decl
) == NULL_TREE
5618 || DECL_INITIAL (decl
) == error_mark_node
)
5620 /* Without weak symbols, we can use COMMON to merge
5621 uninitialized variables. */
5622 TREE_PUBLIC (decl
) = 1;
5623 DECL_COMMON (decl
) = 1;
5627 /* While for initialized variables, we must use internal
5628 linkage -- which means that multiple copies will not
5630 TREE_PUBLIC (decl
) = 0;
5631 DECL_COMMON (decl
) = 0;
5633 if (DECL_INLINE_VAR_P (decl
))
5634 msg
= G_("sorry: semantics of inline variable "
5635 "%q#D are wrong (you%'ll wind up with "
5636 "multiple copies)");
5638 msg
= G_("sorry: semantics of inline function "
5639 "static data %q#D are wrong (you%'ll wind "
5640 "up with multiple copies)");
5641 if (warning_at (DECL_SOURCE_LOCATION (decl
), 0,
5643 inform (DECL_SOURCE_LOCATION (decl
),
5644 "you can work around this by removing the initializer");
5650 /* Issue an error message if DECL is an uninitialized const variable.
5651 CONSTEXPR_CONTEXT_P is true when the function is called in a constexpr
5652 context from potential_constant_expression. Returns true if all is well,
5656 check_for_uninitialized_const_var (tree decl
, bool constexpr_context_p
,
5657 tsubst_flags_t complain
)
5659 tree type
= strip_array_types (TREE_TYPE (decl
));
5661 /* ``Unless explicitly declared extern, a const object does not have
5662 external linkage and must be initialized. ($8.4; $12.1)'' ARM
5665 && !TYPE_REF_P (type
)
5666 && (constexpr_context_p
5667 || CP_TYPE_CONST_P (type
) || var_in_constexpr_fn (decl
))
5668 && !DECL_NONTRIVIALLY_INITIALIZED_P (decl
))
5670 tree field
= default_init_uninitialized_part (type
);
5674 if (!constexpr_context_p
)
5676 if (CP_TYPE_CONST_P (type
))
5678 if (complain
& tf_error
)
5679 permerror (DECL_SOURCE_LOCATION (decl
),
5680 "uninitialized const %qD", decl
);
5684 if (!is_instantiation_of_constexpr (current_function_decl
)
5685 && (complain
& tf_error
))
5686 error_at (DECL_SOURCE_LOCATION (decl
),
5687 "uninitialized variable %qD in %<constexpr%> "
5689 cp_function_chain
->invalid_constexpr
= true;
5692 else if (complain
& tf_error
)
5693 error_at (DECL_SOURCE_LOCATION (decl
),
5694 "uninitialized variable %qD in %<constexpr%> context",
5697 if (CLASS_TYPE_P (type
) && (complain
& tf_error
))
5699 tree defaulted_ctor
;
5701 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (type
)),
5702 "%q#T has no user-provided default constructor", type
);
5703 defaulted_ctor
= in_class_defaulted_default_constructor (type
);
5705 inform (DECL_SOURCE_LOCATION (defaulted_ctor
),
5706 "constructor is not user-provided because it is "
5707 "explicitly defaulted in the class body");
5708 inform (DECL_SOURCE_LOCATION (field
),
5709 "and the implicitly-defined constructor does not "
5710 "initialize %q#D", field
);
5719 /* Structure holding the current initializer being processed by reshape_init.
5720 CUR is a pointer to the current element being processed, END is a pointer
5721 after the last element present in the initializer. */
5724 constructor_elt
*cur
;
5725 constructor_elt
*end
;
5728 static tree
reshape_init_r (tree
, reshape_iter
*, bool, tsubst_flags_t
);
5730 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
5731 returned is the next FIELD_DECL (possibly FIELD itself) that can be
5732 initialized. If there are no more such fields, the return value
5736 next_initializable_field (tree field
)
5739 && (TREE_CODE (field
) != FIELD_DECL
5740 || DECL_UNNAMED_BIT_FIELD (field
)
5741 || (DECL_ARTIFICIAL (field
)
5742 && !(cxx_dialect
>= cxx17
&& DECL_FIELD_IS_BASE (field
)))))
5743 field
= DECL_CHAIN (field
);
5748 /* Return true for [dcl.init.list] direct-list-initialization from
5749 single element of enumeration with a fixed underlying type. */
5752 is_direct_enum_init (tree type
, tree init
)
5754 if (cxx_dialect
>= cxx17
5755 && TREE_CODE (type
) == ENUMERAL_TYPE
5756 && ENUM_FIXED_UNDERLYING_TYPE_P (type
)
5757 && TREE_CODE (init
) == CONSTRUCTOR
5758 && CONSTRUCTOR_IS_DIRECT_INIT (init
)
5759 && CONSTRUCTOR_NELTS (init
) == 1)
5764 /* Subroutine of reshape_init_array and reshape_init_vector, which does
5765 the actual work. ELT_TYPE is the element type of the array. MAX_INDEX is an
5766 INTEGER_CST representing the size of the array minus one (the maximum index),
5767 or NULL_TREE if the array was declared without specifying the size. D is
5768 the iterator within the constructor. */
5771 reshape_init_array_1 (tree elt_type
, tree max_index
, reshape_iter
*d
,
5772 tsubst_flags_t complain
)
5775 bool sized_array_p
= (max_index
&& TREE_CONSTANT (max_index
));
5776 unsigned HOST_WIDE_INT max_index_cst
= 0;
5777 unsigned HOST_WIDE_INT index
;
5779 /* The initializer for an array is always a CONSTRUCTOR. */
5780 new_init
= build_constructor (init_list_type_node
, NULL
);
5784 /* Minus 1 is used for zero sized arrays. */
5785 if (integer_all_onesp (max_index
))
5788 if (tree_fits_uhwi_p (max_index
))
5789 max_index_cst
= tree_to_uhwi (max_index
);
5790 /* sizetype is sign extended, not zero extended. */
5792 max_index_cst
= tree_to_uhwi (fold_convert (size_type_node
, max_index
));
5795 /* Loop until there are no more initializers. */
5797 d
->cur
!= d
->end
&& (!sized_array_p
|| index
<= max_index_cst
);
5801 constructor_elt
*old_cur
= d
->cur
;
5803 check_array_designated_initializer (d
->cur
, index
);
5804 elt_init
= reshape_init_r (elt_type
, d
, /*first_initializer_p=*/false,
5806 if (elt_init
== error_mark_node
)
5807 return error_mark_node
;
5808 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init
),
5809 size_int (index
), elt_init
);
5810 if (!TREE_CONSTANT (elt_init
))
5811 TREE_CONSTANT (new_init
) = false;
5813 /* This can happen with an invalid initializer (c++/54501). */
5814 if (d
->cur
== old_cur
&& !sized_array_p
)
5821 /* Subroutine of reshape_init_r, processes the initializers for arrays.
5822 Parameters are the same of reshape_init_r. */
5825 reshape_init_array (tree type
, reshape_iter
*d
, tsubst_flags_t complain
)
5827 tree max_index
= NULL_TREE
;
5829 gcc_assert (TREE_CODE (type
) == ARRAY_TYPE
);
5831 if (TYPE_DOMAIN (type
))
5832 max_index
= array_type_nelts (type
);
5834 return reshape_init_array_1 (TREE_TYPE (type
), max_index
, d
, complain
);
5837 /* Subroutine of reshape_init_r, processes the initializers for vectors.
5838 Parameters are the same of reshape_init_r. */
5841 reshape_init_vector (tree type
, reshape_iter
*d
, tsubst_flags_t complain
)
5843 tree max_index
= NULL_TREE
;
5845 gcc_assert (VECTOR_TYPE_P (type
));
5847 if (COMPOUND_LITERAL_P (d
->cur
->value
))
5849 tree value
= d
->cur
->value
;
5850 if (!same_type_p (TREE_TYPE (value
), type
))
5852 if (complain
& tf_error
)
5853 error ("invalid type %qT as initializer for a vector of type %qT",
5854 TREE_TYPE (d
->cur
->value
), type
);
5855 value
= error_mark_node
;
5861 /* For a vector, we initialize it as an array of the appropriate size. */
5862 if (VECTOR_TYPE_P (type
))
5863 max_index
= size_int (TYPE_VECTOR_SUBPARTS (type
) - 1);
5865 return reshape_init_array_1 (TREE_TYPE (type
), max_index
, d
, complain
);
5868 /* Subroutine of reshape_init_r, processes the initializers for classes
5869 or union. Parameters are the same of reshape_init_r. */
5872 reshape_init_class (tree type
, reshape_iter
*d
, bool first_initializer_p
,
5873 tsubst_flags_t complain
)
5878 gcc_assert (CLASS_TYPE_P (type
));
5880 /* The initializer for a class is always a CONSTRUCTOR. */
5881 new_init
= build_constructor (init_list_type_node
, NULL
);
5882 field
= next_initializable_field (TYPE_FIELDS (type
));
5888 An initializer for an aggregate member that is an
5889 empty class shall have the form of an empty
5890 initializer-list {}. */
5891 if (!first_initializer_p
)
5893 if (complain
& tf_error
)
5894 error ("initializer for %qT must be brace-enclosed", type
);
5895 return error_mark_node
;
5900 /* Loop through the initializable fields, gathering initializers. */
5901 while (d
->cur
!= d
->end
)
5904 constructor_elt
*old_cur
= d
->cur
;
5906 /* Handle designated initializers, as an extension. */
5909 if (d
->cur
->index
== error_mark_node
)
5910 return error_mark_node
;
5912 if (TREE_CODE (d
->cur
->index
) == FIELD_DECL
)
5914 /* We already reshaped this. */
5915 if (field
!= d
->cur
->index
)
5917 tree id
= DECL_NAME (d
->cur
->index
);
5919 gcc_checking_assert (d
->cur
->index
5920 == get_class_binding (type
, id
, false));
5921 field
= d
->cur
->index
;
5924 else if (TREE_CODE (d
->cur
->index
) == IDENTIFIER_NODE
)
5925 field
= get_class_binding (type
, d
->cur
->index
, false);
5928 if (complain
& tf_error
)
5929 error ("%<[%E] =%> used in a GNU-style designated initializer"
5930 " for class %qT", d
->cur
->index
, type
);
5931 return error_mark_node
;
5934 if (!field
|| TREE_CODE (field
) != FIELD_DECL
)
5936 if (complain
& tf_error
)
5937 error ("%qT has no non-static data member named %qD", type
,
5939 return error_mark_node
;
5943 /* If we processed all the member of the class, we are done. */
5947 field_init
= reshape_init_r (TREE_TYPE (field
), d
,
5948 /*first_initializer_p=*/false, complain
);
5949 if (field_init
== error_mark_node
)
5950 return error_mark_node
;
5952 if (d
->cur
== old_cur
&& d
->cur
->index
)
5954 /* This can happen with an invalid initializer for a flexible
5955 array member (c++/54441). */
5956 if (complain
& tf_error
)
5957 error ("invalid initializer for %q#D", field
);
5958 return error_mark_node
;
5961 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init
), field
, field_init
);
5965 When a union is initialized with a brace-enclosed
5966 initializer, the braces shall only contain an
5967 initializer for the first member of the union. */
5968 if (TREE_CODE (type
) == UNION_TYPE
)
5971 field
= next_initializable_field (DECL_CHAIN (field
));
5977 /* Subroutine of reshape_init_r. We're in a context where C99 initializer
5978 designators are not valid; either complain or return true to indicate
5979 that reshape_init_r should return error_mark_node. */
5982 has_designator_problem (reshape_iter
*d
, tsubst_flags_t complain
)
5986 if (complain
& tf_error
)
5987 error ("C99 designator %qE outside aggregate initializer",
5995 /* Subroutine of reshape_init, which processes a single initializer (part of
5996 a CONSTRUCTOR). TYPE is the type of the variable being initialized, D is the
5997 iterator within the CONSTRUCTOR which points to the initializer to process.
5998 FIRST_INITIALIZER_P is true if this is the first initializer of the
5999 outermost CONSTRUCTOR node. */
6002 reshape_init_r (tree type
, reshape_iter
*d
, bool first_initializer_p
,
6003 tsubst_flags_t complain
)
6005 tree init
= d
->cur
->value
;
6007 if (error_operand_p (init
))
6008 return error_mark_node
;
6010 if (first_initializer_p
&& !CP_AGGREGATE_TYPE_P (type
)
6011 && has_designator_problem (d
, complain
))
6012 return error_mark_node
;
6014 tree stripped_init
= tree_strip_any_location_wrapper (init
);
6016 if (TREE_CODE (type
) == COMPLEX_TYPE
)
6018 /* A complex type can be initialized from one or two initializers,
6019 but braces are not elided. */
6021 if (BRACE_ENCLOSED_INITIALIZER_P (stripped_init
))
6023 if (CONSTRUCTOR_NELTS (stripped_init
) > 2)
6025 if (complain
& tf_error
)
6026 error ("too many initializers for %qT", type
);
6028 return error_mark_node
;
6031 else if (first_initializer_p
&& d
->cur
!= d
->end
)
6033 vec
<constructor_elt
, va_gc
> *v
= 0;
6034 CONSTRUCTOR_APPEND_ELT (v
, NULL_TREE
, init
);
6035 CONSTRUCTOR_APPEND_ELT (v
, NULL_TREE
, d
->cur
->value
);
6036 if (has_designator_problem (d
, complain
))
6037 return error_mark_node
;
6039 init
= build_constructor (init_list_type_node
, v
);
6044 /* A non-aggregate type is always initialized with a single
6046 if (!CP_AGGREGATE_TYPE_P (type
))
6048 /* It is invalid to initialize a non-aggregate type with a
6049 brace-enclosed initializer before C++0x.
6050 We need to check for BRACE_ENCLOSED_INITIALIZER_P here because
6051 of g++.old-deja/g++.mike/p7626.C: a pointer-to-member constant is
6052 a CONSTRUCTOR (with a record type). */
6053 if (TREE_CODE (stripped_init
) == CONSTRUCTOR
6054 /* Don't complain about a capture-init. */
6055 && !CONSTRUCTOR_IS_DIRECT_INIT (stripped_init
)
6056 && BRACE_ENCLOSED_INITIALIZER_P (stripped_init
)) /* p7626.C */
6058 if (SCALAR_TYPE_P (type
))
6060 if (cxx_dialect
< cxx11
6061 /* Isn't value-initialization. */
6062 || CONSTRUCTOR_NELTS (stripped_init
) > 0)
6064 if (complain
& tf_error
)
6065 error ("braces around scalar initializer for type %qT",
6067 init
= error_mark_node
;
6071 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS
);
6078 /* "If T is a class type and the initializer list has a single element of
6079 type cv U, where U is T or a class derived from T, the object is
6080 initialized from that element." Even if T is an aggregate. */
6081 if (cxx_dialect
>= cxx11
&& (CLASS_TYPE_P (type
) || VECTOR_TYPE_P (type
))
6082 && first_initializer_p
6083 && d
->end
- d
->cur
== 1
6084 && reference_related_p (type
, TREE_TYPE (init
)))
6092 All implicit type conversions (clause _conv_) are considered when
6093 initializing the aggregate member with an initializer from an
6094 initializer-list. If the initializer can initialize a member,
6095 the member is initialized. Otherwise, if the member is itself a
6096 non-empty subaggregate, brace elision is assumed and the
6097 initializer is considered for the initialization of the first
6098 member of the subaggregate. */
6099 if (TREE_CODE (init
) != CONSTRUCTOR
6100 /* But don't try this for the first initializer, since that would be
6101 looking through the outermost braces; A a2 = { a1 }; is not a
6102 valid aggregate initialization. */
6103 && !first_initializer_p
6104 && (same_type_ignoring_top_level_qualifiers_p (type
, TREE_TYPE (init
))
6105 || can_convert_arg (type
, TREE_TYPE (init
), init
, LOOKUP_NORMAL
,
6112 /* [dcl.init.string]
6114 A char array (whether plain char, signed char, or unsigned char)
6115 can be initialized by a string-literal (optionally enclosed in
6116 braces); a wchar_t array can be initialized by a wide
6117 string-literal (optionally enclosed in braces). */
6118 if (TREE_CODE (type
) == ARRAY_TYPE
6119 && char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (type
))))
6121 tree str_init
= init
;
6122 tree stripped_str_init
= stripped_init
;
6124 /* Strip one level of braces if and only if they enclose a single
6125 element (as allowed by [dcl.init.string]). */
6126 if (!first_initializer_p
6127 && TREE_CODE (stripped_str_init
) == CONSTRUCTOR
6128 && CONSTRUCTOR_NELTS (stripped_str_init
) == 1)
6130 str_init
= (*CONSTRUCTOR_ELTS (stripped_str_init
))[0].value
;
6131 stripped_str_init
= tree_strip_any_location_wrapper (str_init
);
6134 /* If it's a string literal, then it's the initializer for the array
6135 as a whole. Otherwise, continue with normal initialization for
6136 array types (one value per array element). */
6137 if (TREE_CODE (stripped_str_init
) == STRING_CST
)
6139 if (has_designator_problem (d
, complain
))
6140 return error_mark_node
;
6146 /* The following cases are about aggregates. If we are not within a full
6147 initializer already, and there is not a CONSTRUCTOR, it means that there
6148 is a missing set of braces (that is, we are processing the case for
6149 which reshape_init exists). */
6150 if (!first_initializer_p
)
6152 if (TREE_CODE (stripped_init
) == CONSTRUCTOR
)
6154 if (TREE_TYPE (init
) && TYPE_PTRMEMFUNC_P (TREE_TYPE (init
)))
6155 /* There is no need to reshape pointer-to-member function
6156 initializers, as they are always constructed correctly
6157 by the front end. */
6159 else if (COMPOUND_LITERAL_P (stripped_init
))
6160 /* For a nested compound literal, there is no need to reshape since
6161 brace elision is not allowed. Even if we decided to allow it,
6162 we should add a call to reshape_init in finish_compound_literal,
6163 before calling digest_init, so changing this code would still
6164 not be necessary. */
6165 gcc_assert (!BRACE_ENCLOSED_INITIALIZER_P (stripped_init
));
6169 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (stripped_init
));
6170 return reshape_init (type
, init
, complain
);
6174 if (complain
& tf_warning
)
6175 warning (OPT_Wmissing_braces
,
6176 "missing braces around initializer for %qT",
6180 /* Dispatch to specialized routines. */
6181 if (CLASS_TYPE_P (type
))
6182 return reshape_init_class (type
, d
, first_initializer_p
, complain
);
6183 else if (TREE_CODE (type
) == ARRAY_TYPE
)
6184 return reshape_init_array (type
, d
, complain
);
6185 else if (VECTOR_TYPE_P (type
))
6186 return reshape_init_vector (type
, d
, complain
);
6191 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
6192 brace-enclosed aggregate initializer.
6194 INIT is the CONSTRUCTOR containing the list of initializers describing
6195 a brace-enclosed initializer for an entity of the indicated aggregate TYPE.
6196 It may not presently match the shape of the TYPE; for example:
6198 struct S { int a; int b; };
6199 struct S a[] = { 1, 2, 3, 4 };
6201 Here INIT will hold a vector of four elements, rather than a
6202 vector of two elements, each itself a vector of two elements. This
6203 routine transforms INIT from the former form into the latter. The
6204 revised CONSTRUCTOR node is returned. */
6207 reshape_init (tree type
, tree init
, tsubst_flags_t complain
)
6209 vec
<constructor_elt
, va_gc
> *v
;
6213 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init
));
6215 v
= CONSTRUCTOR_ELTS (init
);
6217 /* An empty constructor does not need reshaping, and it is always a valid
6219 if (vec_safe_is_empty (v
))
6222 /* Handle [dcl.init.list] direct-list-initialization from
6223 single element of enumeration with a fixed underlying type. */
6224 if (is_direct_enum_init (type
, init
))
6226 tree elt
= CONSTRUCTOR_ELT (init
, 0)->value
;
6227 type
= cv_unqualified (type
);
6228 if (check_narrowing (ENUM_UNDERLYING_TYPE (type
), elt
, complain
))
6230 warning_sentinel
w (warn_useless_cast
);
6231 warning_sentinel
w2 (warn_ignored_qualifiers
);
6232 return cp_build_c_cast (type
, elt
, tf_warning_or_error
);
6235 return error_mark_node
;
6238 /* Recurse on this CONSTRUCTOR. */
6240 d
.end
= d
.cur
+ v
->length ();
6242 new_init
= reshape_init_r (type
, &d
, true, complain
);
6243 if (new_init
== error_mark_node
)
6244 return error_mark_node
;
6246 /* Make sure all the element of the constructor were used. Otherwise,
6247 issue an error about exceeding initializers. */
6250 if (complain
& tf_error
)
6251 error ("too many initializers for %qT", type
);
6252 return error_mark_node
;
6255 if (CONSTRUCTOR_IS_DIRECT_INIT (init
)
6256 && BRACE_ENCLOSED_INITIALIZER_P (new_init
))
6257 CONSTRUCTOR_IS_DIRECT_INIT (new_init
) = true;
6262 /* Verify array initializer. Returns true if errors have been reported. */
6265 check_array_initializer (tree decl
, tree type
, tree init
)
6267 tree element_type
= TREE_TYPE (type
);
6269 /* The array type itself need not be complete, because the
6270 initializer may tell us how many elements are in the array.
6271 But, the elements of the array must be complete. */
6272 if (!COMPLETE_TYPE_P (complete_type (element_type
)))
6275 error_at (DECL_SOURCE_LOCATION (decl
),
6276 "elements of array %q#D have incomplete type", decl
);
6278 error ("elements of array %q#T have incomplete type", type
);
6281 /* A compound literal can't have variable size. */
6283 && ((COMPLETE_TYPE_P (type
) && !TREE_CONSTANT (TYPE_SIZE (type
)))
6284 || !TREE_CONSTANT (TYPE_SIZE (element_type
))))
6286 error ("variable-sized compound literal");
6292 /* Subroutine of check_initializer; args are passed down from that function.
6293 Set stmts_are_full_exprs_p to 1 across a call to build_aggr_init. */
6296 build_aggr_init_full_exprs (tree decl
, tree init
, int flags
)
6299 gcc_assert (stmts_are_full_exprs_p ());
6300 return build_aggr_init (decl
, init
, flags
, tf_warning_or_error
);
6303 /* Verify INIT (the initializer for DECL), and record the
6304 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
6305 grok_reference_init.
6307 If the return value is non-NULL, it is an expression that must be
6308 evaluated dynamically to initialize DECL. */
6311 check_initializer (tree decl
, tree init
, int flags
, vec
<tree
, va_gc
> **cleanups
)
6313 tree type
= TREE_TYPE (decl
);
6314 tree init_code
= NULL
;
6317 /* Things that are going to be initialized need to have complete
6319 TREE_TYPE (decl
) = type
= complete_type (TREE_TYPE (decl
));
6321 if (DECL_HAS_VALUE_EXPR_P (decl
))
6323 /* A variable with DECL_HAS_VALUE_EXPR_P set is just a placeholder,
6324 it doesn't have storage to be initialized. */
6325 gcc_assert (init
== NULL_TREE
);
6329 if (type
== error_mark_node
)
6330 /* We will have already complained. */
6333 if (TREE_CODE (type
) == ARRAY_TYPE
)
6335 if (check_array_initializer (decl
, type
, init
))
6338 else if (!COMPLETE_TYPE_P (type
))
6340 error_at (DECL_SOURCE_LOCATION (decl
),
6341 "%q#D has incomplete type", decl
);
6342 TREE_TYPE (decl
) = error_mark_node
;
6346 /* There is no way to make a variable-sized class type in GNU C++. */
6347 gcc_assert (TREE_CONSTANT (TYPE_SIZE (type
)));
6349 if (init
&& BRACE_ENCLOSED_INITIALIZER_P (init
))
6351 int init_len
= CONSTRUCTOR_NELTS (init
);
6352 if (SCALAR_TYPE_P (type
))
6356 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS
);
6357 init
= build_zero_init (type
, NULL_TREE
, false);
6359 else if (init_len
!= 1 && TREE_CODE (type
) != COMPLEX_TYPE
)
6361 error_at (cp_expr_loc_or_loc (init
, DECL_SOURCE_LOCATION (decl
)),
6362 "scalar object %qD requires one element in "
6363 "initializer", decl
);
6364 TREE_TYPE (decl
) = error_mark_node
;
6370 if (TREE_CODE (decl
) == CONST_DECL
)
6372 gcc_assert (!TYPE_REF_P (type
));
6374 DECL_INITIAL (decl
) = init
;
6376 gcc_assert (init
!= NULL_TREE
);
6379 else if (!init
&& DECL_REALLY_EXTERN (decl
))
6381 else if (init
|| type_build_ctor_call (type
)
6382 || TYPE_REF_P (type
))
6384 if (TYPE_REF_P (type
))
6386 init
= grok_reference_init (decl
, type
, init
, flags
);
6387 flags
|= LOOKUP_ALREADY_DIGESTED
;
6390 check_for_uninitialized_const_var (decl
, /*constexpr_context_p=*/false,
6391 tf_warning_or_error
);
6392 /* Do not reshape constructors of vectors (they don't need to be
6394 else if (BRACE_ENCLOSED_INITIALIZER_P (init
))
6396 if (is_std_init_list (type
))
6398 init
= perform_implicit_conversion (type
, init
,
6399 tf_warning_or_error
);
6400 flags
|= LOOKUP_ALREADY_DIGESTED
;
6402 else if (TYPE_NON_AGGREGATE_CLASS (type
))
6404 /* Don't reshape if the class has constructors. */
6405 if (cxx_dialect
== cxx98
)
6406 error_at (cp_expr_loc_or_loc (init
, DECL_SOURCE_LOCATION (decl
)),
6407 "in C++98 %qD must be initialized by "
6408 "constructor, not by %<{...}%>",
6411 else if (VECTOR_TYPE_P (type
) && TYPE_VECTOR_OPAQUE (type
))
6413 error ("opaque vector types cannot be initialized");
6414 init
= error_mark_node
;
6418 init
= reshape_init (type
, init
, tf_warning_or_error
);
6419 flags
|= LOOKUP_NO_NARROWING
;
6422 else if (TREE_CODE (init
) == TREE_LIST
6423 && TREE_TYPE (init
) != unknown_type_node
6424 && !MAYBE_CLASS_TYPE_P (type
))
6426 gcc_assert (TREE_CODE (decl
) != RESULT_DECL
);
6428 /* We get here with code like `int a (2);' */
6429 init
= build_x_compound_expr_from_list (init
, ELK_INIT
,
6430 tf_warning_or_error
);
6433 /* If DECL has an array type without a specific bound, deduce the
6434 array size from the initializer. */
6435 maybe_deduce_size_from_array_init (decl
, init
);
6436 type
= TREE_TYPE (decl
);
6437 if (type
== error_mark_node
)
6440 if (((type_build_ctor_call (type
) || CLASS_TYPE_P (type
))
6441 && !(flags
& LOOKUP_ALREADY_DIGESTED
)
6442 && !(init
&& BRACE_ENCLOSED_INITIALIZER_P (init
)
6443 && CP_AGGREGATE_TYPE_P (type
)
6444 && (CLASS_TYPE_P (type
)
6445 || !TYPE_NEEDS_CONSTRUCTING (type
)
6446 || type_has_extended_temps (type
))))
6447 || (DECL_DECOMPOSITION_P (decl
) && TREE_CODE (type
) == ARRAY_TYPE
))
6449 init_code
= build_aggr_init_full_exprs (decl
, init
, flags
);
6451 /* A constructor call is a non-trivial initializer even if
6452 it isn't explicitly written. */
6453 if (TREE_SIDE_EFFECTS (init_code
))
6454 DECL_NONTRIVIALLY_INITIALIZED_P (decl
) = true;
6456 /* If this is a constexpr initializer, expand_default_init will
6457 have returned an INIT_EXPR rather than a CALL_EXPR. In that
6458 case, pull the initializer back out and pass it down into
6459 store_init_value. */
6460 while (TREE_CODE (init_code
) == EXPR_STMT
6461 || TREE_CODE (init_code
) == CONVERT_EXPR
)
6462 init_code
= TREE_OPERAND (init_code
, 0);
6463 if (TREE_CODE (init_code
) == INIT_EXPR
)
6465 init
= TREE_OPERAND (init_code
, 1);
6466 init_code
= NULL_TREE
;
6467 /* Don't call digest_init; it's unnecessary and will complain
6468 about aggregate initialization of non-aggregate classes. */
6469 flags
|= LOOKUP_ALREADY_DIGESTED
;
6471 else if (DECL_DECLARED_CONSTEXPR_P (decl
))
6473 /* Declared constexpr, but no suitable initializer; massage
6474 init appropriately so we can pass it into store_init_value
6476 if (CLASS_TYPE_P (type
)
6477 && (!init
|| TREE_CODE (init
) == TREE_LIST
))
6479 init
= build_functional_cast (type
, init
, tf_none
);
6480 if (TREE_CODE (init
) == TARGET_EXPR
)
6481 TARGET_EXPR_DIRECT_INIT_P (init
) = true;
6483 init_code
= NULL_TREE
;
6489 if (init
&& TREE_CODE (init
) != TREE_VEC
)
6491 /* In aggregate initialization of a variable, each element
6492 initialization is a full-expression because there is no
6493 enclosing expression. */
6494 gcc_assert (stmts_are_full_exprs_p ());
6496 init_code
= store_init_value (decl
, init
, cleanups
, flags
);
6498 if (DECL_INITIAL (decl
)
6499 && TREE_CODE (DECL_INITIAL (decl
)) == CONSTRUCTOR
6500 && !vec_safe_is_empty (CONSTRUCTOR_ELTS (DECL_INITIAL (decl
))))
6502 tree elt
= CONSTRUCTOR_ELTS (DECL_INITIAL (decl
))->last ().value
;
6503 if (TREE_CODE (TREE_TYPE (elt
)) == ARRAY_TYPE
6504 && TYPE_SIZE (TREE_TYPE (elt
)) == NULL_TREE
)
6505 cp_complete_array_type (&TREE_TYPE (elt
), elt
, false);
6508 if (pedantic
&& TREE_CODE (type
) == ARRAY_TYPE
6509 && DECL_INITIAL (decl
)
6510 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
6511 && PAREN_STRING_LITERAL_P (DECL_INITIAL (decl
)))
6512 warning_at (cp_expr_loc_or_loc (DECL_INITIAL (decl
),
6513 DECL_SOURCE_LOCATION (decl
)),
6514 0, "array %qD initialized by parenthesized "
6515 "string literal %qE",
6516 decl
, DECL_INITIAL (decl
));
6522 if (CLASS_TYPE_P (core_type
= strip_array_types (type
))
6523 && (CLASSTYPE_READONLY_FIELDS_NEED_INIT (core_type
)
6524 || CLASSTYPE_REF_FIELDS_NEED_INIT (core_type
)))
6525 diagnose_uninitialized_cst_or_ref_member (core_type
, /*using_new=*/false,
6528 check_for_uninitialized_const_var (decl
, /*constexpr_context_p=*/false,
6529 tf_warning_or_error
);
6532 if (init
&& init
!= error_mark_node
)
6533 init_code
= build2 (INIT_EXPR
, type
, decl
, init
);
6537 /* We might have set these in cp_finish_decl. */
6538 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl
) = false;
6539 TREE_CONSTANT (decl
) = false;
6543 && (DECL_IN_AGGR_P (decl
)
6544 && DECL_INITIALIZED_IN_CLASS_P (decl
)
6545 && !DECL_VAR_DECLARED_INLINE_P (decl
)))
6547 static int explained
= 0;
6549 if (cxx_dialect
< cxx11
)
6550 error ("initializer invalid for static member with constructor");
6551 else if (cxx_dialect
< cxx17
)
6552 error ("non-constant in-class initialization invalid for static "
6553 "member %qD", decl
);
6555 error ("non-constant in-class initialization invalid for non-inline "
6556 "static member %qD", decl
);
6559 inform (input_location
,
6560 "(an out of class initialization is required)");
6569 /* If DECL is not a local variable, give it RTL. */
6572 make_rtl_for_nonlocal_decl (tree decl
, tree init
, const char* asmspec
)
6574 int toplev
= toplevel_bindings_p ();
6577 /* Set the DECL_ASSEMBLER_NAME for the object. */
6580 /* The `register' keyword, when used together with an
6581 asm-specification, indicates that the variable should be
6582 placed in a particular register. */
6583 if (VAR_P (decl
) && DECL_REGISTER (decl
))
6585 set_user_assembler_name (decl
, asmspec
);
6586 DECL_HARD_REGISTER (decl
) = 1;
6590 if (TREE_CODE (decl
) == FUNCTION_DECL
6591 && fndecl_built_in_p (decl
, BUILT_IN_NORMAL
))
6592 set_builtin_user_assembler_name (decl
, asmspec
);
6593 set_user_assembler_name (decl
, asmspec
);
6597 /* Handle non-variables up front. */
6600 rest_of_decl_compilation (decl
, toplev
, at_eof
);
6604 /* If we see a class member here, it should be a static data
6606 if (DECL_LANG_SPECIFIC (decl
) && DECL_IN_AGGR_P (decl
))
6608 gcc_assert (TREE_STATIC (decl
));
6609 /* An in-class declaration of a static data member should be
6610 external; it is only a declaration, and not a definition. */
6611 if (init
== NULL_TREE
)
6612 gcc_assert (DECL_EXTERNAL (decl
)
6613 || !TREE_PUBLIC (decl
)
6614 || DECL_INLINE_VAR_P (decl
));
6617 /* We don't create any RTL for local variables. */
6618 if (DECL_FUNCTION_SCOPE_P (decl
) && !TREE_STATIC (decl
))
6621 /* We defer emission of local statics until the corresponding
6622 DECL_EXPR is expanded. But with constexpr its function might never
6623 be expanded, so go ahead and tell cgraph about the variable now. */
6624 defer_p
= ((DECL_FUNCTION_SCOPE_P (decl
)
6625 && !var_in_maybe_constexpr_fn (decl
))
6626 || DECL_VIRTUAL_P (decl
));
6628 /* Defer template instantiations. */
6629 if (DECL_LANG_SPECIFIC (decl
)
6630 && DECL_IMPLICIT_INSTANTIATION (decl
))
6633 /* If we're not deferring, go ahead and assemble the variable. */
6635 rest_of_decl_compilation (decl
, toplev
, at_eof
);
6638 /* walk_tree helper for wrap_temporary_cleanups, below. */
6641 wrap_cleanups_r (tree
*stmt_p
, int *walk_subtrees
, void *data
)
6643 /* Stop at types or full-expression boundaries. */
6644 if (TYPE_P (*stmt_p
)
6645 || TREE_CODE (*stmt_p
) == CLEANUP_POINT_EXPR
)
6651 if (TREE_CODE (*stmt_p
) == TARGET_EXPR
)
6653 tree guard
= (tree
)data
;
6654 tree tcleanup
= TARGET_EXPR_CLEANUP (*stmt_p
);
6656 tcleanup
= build2 (TRY_CATCH_EXPR
, void_type_node
, tcleanup
, guard
);
6657 /* Tell honor_protect_cleanup_actions to handle this as a separate
6659 TRY_CATCH_IS_CLEANUP (tcleanup
) = 1;
6661 TARGET_EXPR_CLEANUP (*stmt_p
) = tcleanup
;
6667 /* We're initializing a local variable which has a cleanup GUARD. If there
6668 are any temporaries used in the initializer INIT of this variable, we
6669 need to wrap their cleanups with TRY_CATCH_EXPR (, GUARD) so that the
6670 variable will be cleaned up properly if one of them throws.
6672 Unfortunately, there's no way to express this properly in terms of
6673 nesting, as the regions for the temporaries overlap the region for the
6674 variable itself; if there are two temporaries, the variable needs to be
6675 the first thing destroyed if either of them throws. However, we only
6676 want to run the variable's cleanup if it actually got constructed. So
6677 we need to guard the temporary cleanups with the variable's cleanup if
6678 they are run on the normal path, but not if they are run on the
6679 exceptional path. We implement this by telling
6680 honor_protect_cleanup_actions to strip the variable cleanup from the
6681 exceptional path. */
6684 wrap_temporary_cleanups (tree init
, tree guard
)
6686 cp_walk_tree_without_duplicates (&init
, wrap_cleanups_r
, (void *)guard
);
6689 /* Generate code to initialize DECL (a local variable). */
6692 initialize_local_var (tree decl
, tree init
)
6694 tree type
= TREE_TYPE (decl
);
6698 gcc_assert (VAR_P (decl
)
6699 || TREE_CODE (decl
) == RESULT_DECL
);
6700 gcc_assert (!TREE_STATIC (decl
));
6702 if (DECL_SIZE (decl
) == NULL_TREE
)
6704 /* If we used it already as memory, it must stay in memory. */
6705 DECL_INITIAL (decl
) = NULL_TREE
;
6706 TREE_ADDRESSABLE (decl
) = TREE_USED (decl
);
6710 if (type
== error_mark_node
)
6713 /* Compute and store the initial value. */
6714 already_used
= TREE_USED (decl
) || TREE_USED (type
);
6715 if (TREE_USED (type
))
6716 DECL_READ_P (decl
) = 1;
6718 /* Generate a cleanup, if necessary. */
6719 cleanup
= cxx_maybe_build_cleanup (decl
, tf_warning_or_error
);
6721 /* Perform the initialization. */
6724 tree rinit
= (TREE_CODE (init
) == INIT_EXPR
6725 ? TREE_OPERAND (init
, 1) : NULL_TREE
);
6726 if (rinit
&& !TREE_SIDE_EFFECTS (rinit
))
6728 /* Stick simple initializers in DECL_INITIAL so that
6729 -Wno-init-self works (c++/34772). */
6730 gcc_assert (TREE_OPERAND (init
, 0) == decl
);
6731 DECL_INITIAL (decl
) = rinit
;
6733 if (warn_init_self
&& TYPE_REF_P (type
))
6737 warning_at (DECL_SOURCE_LOCATION (decl
),
6739 "reference %qD is initialized with itself", decl
);
6744 int saved_stmts_are_full_exprs_p
;
6746 /* If we're only initializing a single object, guard the
6747 destructors of any temporaries used in its initializer with
6748 its destructor. This isn't right for arrays because each
6749 element initialization is a full-expression. */
6750 if (cleanup
&& TREE_CODE (type
) != ARRAY_TYPE
)
6751 wrap_temporary_cleanups (init
, cleanup
);
6753 gcc_assert (building_stmt_list_p ());
6754 saved_stmts_are_full_exprs_p
= stmts_are_full_exprs_p ();
6755 current_stmt_tree ()->stmts_are_full_exprs_p
= 1;
6756 finish_expr_stmt (init
);
6757 current_stmt_tree ()->stmts_are_full_exprs_p
=
6758 saved_stmts_are_full_exprs_p
;
6762 /* Set this to 0 so we can tell whether an aggregate which was
6763 initialized was ever used. Don't do this if it has a
6764 destructor, so we don't complain about the 'resource
6765 allocation is initialization' idiom. Now set
6766 attribute((unused)) on types so decls of that type will be
6767 marked used. (see TREE_USED, above.) */
6768 if (TYPE_NEEDS_CONSTRUCTING (type
)
6770 && TYPE_HAS_TRIVIAL_DESTRUCTOR (type
)
6771 && DECL_NAME (decl
))
6772 TREE_USED (decl
) = 0;
6773 else if (already_used
)
6774 TREE_USED (decl
) = 1;
6777 finish_decl_cleanup (decl
, cleanup
);
6780 /* DECL is a VAR_DECL for a compiler-generated variable with static
6781 storage duration (like a virtual table) whose initializer is a
6782 compile-time constant. Initialize the variable and provide it to the
6786 initialize_artificial_var (tree decl
, vec
<constructor_elt
, va_gc
> *v
)
6789 gcc_assert (DECL_ARTIFICIAL (decl
));
6790 init
= build_constructor (TREE_TYPE (decl
), v
);
6791 gcc_assert (TREE_CODE (init
) == CONSTRUCTOR
);
6792 DECL_INITIAL (decl
) = init
;
6793 DECL_INITIALIZED_P (decl
) = 1;
6794 /* Mark the decl as constexpr so that we can access its content
6796 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl
) = true;
6797 DECL_DECLARED_CONSTEXPR_P (decl
) = true;
6798 determine_visibility (decl
);
6799 layout_var_decl (decl
);
6800 maybe_commonize_var (decl
);
6801 make_rtl_for_nonlocal_decl (decl
, init
, /*asmspec=*/NULL
);
6804 /* INIT is the initializer for a variable, as represented by the
6805 parser. Returns true iff INIT is value-dependent. */
6808 value_dependent_init_p (tree init
)
6810 if (TREE_CODE (init
) == TREE_LIST
)
6811 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
6812 return any_value_dependent_elements_p (init
);
6813 else if (TREE_CODE (init
) == CONSTRUCTOR
)
6814 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
6816 if (dependent_type_p (TREE_TYPE (init
)))
6819 vec
<constructor_elt
, va_gc
> *elts
;
6823 elts
= CONSTRUCTOR_ELTS (init
);
6824 nelts
= vec_safe_length (elts
);
6825 for (i
= 0; i
< nelts
; ++i
)
6826 if (value_dependent_init_p ((*elts
)[i
].value
))
6830 /* It must be a simple expression, e.g., int i = 3; */
6831 return value_dependent_expression_p (init
);
6836 // Returns true if a DECL is VAR_DECL with the concept specifier.
6838 is_concept_var (tree decl
)
6840 return (VAR_P (decl
)
6841 // Not all variables have DECL_LANG_SPECIFIC.
6842 && DECL_LANG_SPECIFIC (decl
)
6843 && DECL_DECLARED_CONCEPT_P (decl
));
6846 /* A helper function to be called via walk_tree. If any label exists
6847 under *TP, it is (going to be) forced. Set has_forced_label_in_static. */
6850 notice_forced_label_r (tree
*tp
, int *walk_subtrees
, void *)
6854 if (TREE_CODE (*tp
) == LABEL_DECL
)
6855 cfun
->has_forced_label_in_static
= 1;
6859 /* Finish processing of a declaration;
6860 install its line number and initial value.
6861 If the length of an array type is not known before,
6862 it must be determined now, from the initial value, or it is an error.
6864 INIT is the initializer (if any) for DECL. If INIT_CONST_EXPR_P is
6865 true, then INIT is an integral constant expression.
6867 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
6868 if the (init) syntax was used. */
6871 cp_finish_decl (tree decl
, tree init
, bool init_const_expr_p
,
6872 tree asmspec_tree
, int flags
)
6875 vec
<tree
, va_gc
> *cleanups
= NULL
;
6876 const char *asmspec
= NULL
;
6877 int was_readonly
= 0;
6878 bool var_definition_p
= false;
6881 if (decl
== error_mark_node
)
6886 error ("assignment (not initialization) in declaration");
6890 gcc_assert (TREE_CODE (decl
) != RESULT_DECL
);
6891 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
6892 gcc_assert (TREE_CODE (decl
) != PARM_DECL
);
6894 type
= TREE_TYPE (decl
);
6895 if (type
== error_mark_node
)
6898 /* Warn about register storage specifiers except when in GNU global
6899 or local register variable extension. */
6900 if (VAR_P (decl
) && DECL_REGISTER (decl
) && asmspec_tree
== NULL_TREE
)
6902 if (cxx_dialect
>= cxx17
)
6903 pedwarn (DECL_SOURCE_LOCATION (decl
), OPT_Wregister
,
6904 "ISO C++17 does not allow %<register%> storage "
6907 warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wregister
,
6908 "%<register%> storage class specifier used");
6911 /* If a name was specified, get the string. */
6912 if (at_namespace_scope_p ())
6913 asmspec_tree
= maybe_apply_renaming_pragma (decl
, asmspec_tree
);
6914 if (asmspec_tree
&& asmspec_tree
!= error_mark_node
)
6915 asmspec
= TREE_STRING_POINTER (asmspec_tree
);
6917 if (current_class_type
6918 && CP_DECL_CONTEXT (decl
) == current_class_type
6919 && TYPE_BEING_DEFINED (current_class_type
)
6920 && !CLASSTYPE_TEMPLATE_INSTANTIATION (current_class_type
)
6921 && (DECL_INITIAL (decl
) || init
))
6922 DECL_INITIALIZED_IN_CLASS_P (decl
) = 1;
6924 /* Do auto deduction unless decl is a function or an uninstantiated
6925 template specialization. */
6926 if (TREE_CODE (decl
) != FUNCTION_DECL
6927 && !(init
== NULL_TREE
6928 && DECL_LANG_SPECIFIC (decl
)
6929 && DECL_TEMPLATE_INSTANTIATION (decl
)
6930 && !DECL_TEMPLATE_INSTANTIATED (decl
))
6931 && (auto_node
= type_uses_auto (type
)))
6934 if (init
== NULL_TREE
)
6935 gcc_assert (CLASS_PLACEHOLDER_TEMPLATE (auto_node
));
6939 if (TREE_CODE (d_init
) == TREE_LIST
6940 && !CLASS_PLACEHOLDER_TEMPLATE (auto_node
))
6941 d_init
= build_x_compound_expr_from_list (d_init
, ELK_INIT
,
6942 tf_warning_or_error
);
6943 d_init
= resolve_nondeduced_context (d_init
, tf_warning_or_error
);
6945 enum auto_deduction_context adc
= adc_variable_type
;
6946 if (VAR_P (decl
) && DECL_DECOMPOSITION_P (decl
))
6947 adc
= adc_decomp_type
;
6948 type
= TREE_TYPE (decl
) = do_auto_deduction (type
, d_init
, auto_node
,
6949 tf_warning_or_error
, adc
,
6951 if (type
== error_mark_node
)
6953 if (TREE_CODE (type
) == FUNCTION_TYPE
)
6955 error ("initializer for %<decltype(auto) %D%> has function type "
6956 "(did you forget the %<()%> ?)", decl
);
6957 TREE_TYPE (decl
) = error_mark_node
;
6960 cp_apply_type_quals_to_decl (cp_type_quals (type
), decl
);
6963 if (ensure_literal_type_for_constexpr_object (decl
) == error_mark_node
)
6965 DECL_DECLARED_CONSTEXPR_P (decl
) = 0;
6966 if (VAR_P (decl
) && DECL_CLASS_SCOPE_P (decl
))
6969 DECL_EXTERNAL (decl
) = 1;
6974 && DECL_CLASS_SCOPE_P (decl
)
6975 && DECL_INITIALIZED_IN_CLASS_P (decl
))
6976 check_static_variable_definition (decl
, type
);
6978 if (init
&& TREE_CODE (decl
) == FUNCTION_DECL
)
6981 if (init
== ridpointers
[(int)RID_DELETE
])
6983 /* FIXME check this is 1st decl. */
6984 DECL_DELETED_FN (decl
) = 1;
6985 DECL_DECLARED_INLINE_P (decl
) = 1;
6986 DECL_INITIAL (decl
) = error_mark_node
;
6987 FOR_EACH_CLONE (clone
, decl
)
6989 DECL_DELETED_FN (clone
) = 1;
6990 DECL_DECLARED_INLINE_P (clone
) = 1;
6991 DECL_INITIAL (clone
) = error_mark_node
;
6995 else if (init
== ridpointers
[(int)RID_DEFAULT
])
6997 if (defaultable_fn_check (decl
))
6998 DECL_DEFAULTED_FN (decl
) = 1;
7000 DECL_INITIAL (decl
) = NULL_TREE
;
7004 if (init
&& VAR_P (decl
))
7006 DECL_NONTRIVIALLY_INITIALIZED_P (decl
) = 1;
7007 /* If DECL is a reference, then we want to know whether init is a
7008 reference constant; init_const_expr_p as passed tells us whether
7009 it's an rvalue constant. */
7010 if (TYPE_REF_P (type
))
7011 init_const_expr_p
= potential_constant_expression (init
);
7012 if (init_const_expr_p
)
7014 /* Set these flags now for templates. We'll update the flags in
7015 store_init_value for instantiations. */
7016 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl
) = 1;
7017 if (decl_maybe_constant_var_p (decl
)
7018 /* FIXME setting TREE_CONSTANT on refs breaks the back end. */
7019 && !TYPE_REF_P (type
))
7020 TREE_CONSTANT (decl
) = 1;
7024 if (processing_template_decl
)
7026 bool type_dependent_p
;
7028 /* Add this declaration to the statement-tree. */
7029 if (at_function_scope_p ())
7030 add_decl_expr (decl
);
7032 type_dependent_p
= dependent_type_p (type
);
7034 if (check_for_bare_parameter_packs (init
))
7037 DECL_INITIAL (decl
) = NULL_TREE
;
7040 /* Generally, initializers in templates are expanded when the
7041 template is instantiated. But, if DECL is a variable constant
7042 then it can be used in future constant expressions, so its value
7043 must be available. */
7045 bool dep_init
= false;
7047 if (!VAR_P (decl
) || type_dependent_p
)
7048 /* We can't do anything if the decl has dependent type. */;
7049 else if (!init
&& is_concept_var (decl
))
7051 error ("variable concept has no initializer");
7052 init
= boolean_true_node
;
7055 && init_const_expr_p
7056 && !TYPE_REF_P (type
)
7057 && decl_maybe_constant_var_p (decl
)
7058 && !(dep_init
= value_dependent_init_p (init
)))
7060 /* This variable seems to be a non-dependent constant, so process
7061 its initializer. If check_initializer returns non-null the
7062 initialization wasn't constant after all. */
7064 cleanups
= make_tree_vector ();
7065 init_code
= check_initializer (decl
, init
, flags
, &cleanups
);
7066 if (init_code
== NULL_TREE
)
7068 release_tree_vector (cleanups
);
7072 gcc_assert (!DECL_PRETTY_FUNCTION_P (decl
));
7073 /* Deduce array size even if the initializer is dependent. */
7074 maybe_deduce_size_from_array_init (decl
, init
);
7075 /* And complain about multiple initializers. */
7076 if (init
&& TREE_CODE (init
) == TREE_LIST
&& TREE_CHAIN (init
)
7077 && !MAYBE_CLASS_TYPE_P (type
))
7078 init
= build_x_compound_expr_from_list (init
, ELK_INIT
,
7079 tf_warning_or_error
);
7083 DECL_INITIAL (decl
) = init
;
7087 retrofit_lang_decl (decl
);
7088 SET_DECL_DEPENDENT_INIT_P (decl
, true);
7093 /* Just store non-static data member initializers for later. */
7094 if (init
&& TREE_CODE (decl
) == FIELD_DECL
)
7095 DECL_INITIAL (decl
) = init
;
7097 /* Take care of TYPE_DECLs up front. */
7098 if (TREE_CODE (decl
) == TYPE_DECL
)
7100 if (type
!= error_mark_node
7101 && MAYBE_CLASS_TYPE_P (type
) && DECL_NAME (decl
))
7103 if (TREE_TYPE (DECL_NAME (decl
)) && TREE_TYPE (decl
) != type
)
7104 warning (0, "shadowing previous type declaration of %q#D", decl
);
7105 set_identifier_type_value (DECL_NAME (decl
), decl
);
7108 /* If we have installed this as the canonical typedef for this
7109 type, and that type has not been defined yet, delay emitting
7110 the debug information for it, as we will emit it later. */
7111 if (TYPE_MAIN_DECL (TREE_TYPE (decl
)) == decl
7112 && !COMPLETE_TYPE_P (TREE_TYPE (decl
)))
7113 TYPE_DECL_SUPPRESS_DEBUG (decl
) = 1;
7115 rest_of_decl_compilation (decl
, DECL_FILE_SCOPE_P (decl
),
7120 /* A reference will be modified here, as it is initialized. */
7121 if (! DECL_EXTERNAL (decl
)
7122 && TREE_READONLY (decl
)
7123 && TYPE_REF_P (type
))
7126 TREE_READONLY (decl
) = 0;
7131 /* If this is a local variable that will need a mangled name,
7132 register it now. We must do this before processing the
7133 initializer for the variable, since the initialization might
7134 require a guard variable, and since the mangled name of the
7135 guard variable will depend on the mangled name of this
7137 if (DECL_FUNCTION_SCOPE_P (decl
)
7138 && TREE_STATIC (decl
)
7139 && !DECL_ARTIFICIAL (decl
))
7141 /* The variable holding an anonymous union will have had its
7142 discriminator set in finish_anon_union, after which it's
7143 NAME will have been cleared. */
7144 if (DECL_NAME (decl
))
7145 determine_local_discriminator (decl
);
7146 /* Normally has_forced_label_in_static is set during GIMPLE
7147 lowering, but [cd]tors are never actually compiled directly.
7148 We need to set this early so we can deal with the label
7149 address extension. */
7150 if ((DECL_CONSTRUCTOR_P (current_function_decl
)
7151 || DECL_DESTRUCTOR_P (current_function_decl
))
7154 walk_tree (&init
, notice_forced_label_r
, NULL
, NULL
);
7155 add_local_decl (cfun
, decl
);
7157 /* And make sure it's in the symbol table for
7158 c_parse_final_cleanups to find. */
7159 varpool_node::get_create (decl
);
7162 /* Convert the initializer to the type of DECL, if we have not
7163 already initialized DECL. */
7164 if (!DECL_INITIALIZED_P (decl
)
7165 /* If !DECL_EXTERNAL then DECL is being defined. In the
7166 case of a static data member initialized inside the
7167 class-specifier, there can be an initializer even if DECL
7168 is *not* defined. */
7169 && (!DECL_EXTERNAL (decl
) || init
))
7171 cleanups
= make_tree_vector ();
7172 init
= check_initializer (decl
, init
, flags
, &cleanups
);
7178 The memory occupied by any object of static storage
7179 duration is zero-initialized at program startup before
7180 any other initialization takes place.
7182 We cannot create an appropriate initializer until after
7183 the type of DECL is finalized. If DECL_INITIAL is set,
7184 then the DECL is statically initialized, and any
7185 necessary zero-initialization has already been performed. */
7186 if (TREE_STATIC (decl
) && !DECL_INITIAL (decl
))
7187 DECL_INITIAL (decl
) = build_zero_init (TREE_TYPE (decl
),
7188 /*nelts=*/NULL_TREE
,
7189 /*static_storage_p=*/true);
7190 /* Remember that the initialization for this variable has
7192 DECL_INITIALIZED_P (decl
) = 1;
7193 /* This declaration is the definition of this variable,
7194 unless we are initializing a static data member within
7195 the class specifier. */
7196 if (!DECL_EXTERNAL (decl
))
7197 var_definition_p
= true;
7199 /* If the variable has an array type, lay out the type, even if
7200 there is no initializer. It is valid to index through the
7201 array, and we must get TYPE_ALIGN set correctly on the array
7203 else if (TREE_CODE (type
) == ARRAY_TYPE
)
7206 if (TREE_STATIC (decl
)
7207 && !at_function_scope_p ()
7208 && current_function_decl
== NULL
)
7209 /* So decl is a global variable or a static member of a
7210 non local class. Record the types it uses
7211 so that we can decide later to emit debug info for them. */
7212 record_types_used_by_current_var_decl (decl
);
7215 /* Add this declaration to the statement-tree. This needs to happen
7216 after the call to check_initializer so that the DECL_EXPR for a
7217 reference temp is added before the DECL_EXPR for the reference itself. */
7218 if (DECL_FUNCTION_SCOPE_P (decl
))
7220 /* If we're building a variable sized type, and we might be
7221 reachable other than via the top of the current binding
7222 level, then create a new BIND_EXPR so that we deallocate
7223 the object at the right time. */
7226 && !TREE_CONSTANT (DECL_SIZE (decl
))
7227 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list
))
7230 bind
= build3 (BIND_EXPR
, void_type_node
, NULL
, NULL
, NULL
);
7231 TREE_SIDE_EFFECTS (bind
) = 1;
7233 BIND_EXPR_BODY (bind
) = push_stmt_list ();
7235 add_decl_expr (decl
);
7238 /* Let the middle end know about variables and functions -- but not
7239 static data members in uninstantiated class templates. */
7240 if (VAR_OR_FUNCTION_DECL_P (decl
))
7244 layout_var_decl (decl
);
7245 maybe_commonize_var (decl
);
7248 /* This needs to happen after the linkage is set. */
7249 determine_visibility (decl
);
7251 if (var_definition_p
&& TREE_STATIC (decl
))
7253 /* If a TREE_READONLY variable needs initialization
7254 at runtime, it is no longer readonly and we need to
7255 avoid MEM_READONLY_P being set on RTL created for it. */
7258 if (TREE_READONLY (decl
))
7259 TREE_READONLY (decl
) = 0;
7262 else if (was_readonly
)
7263 TREE_READONLY (decl
) = 1;
7265 /* Likewise if it needs destruction. */
7266 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type
))
7267 TREE_READONLY (decl
) = 0;
7270 make_rtl_for_nonlocal_decl (decl
, init
, asmspec
);
7272 /* Check for abstractness of the type. Notice that there is no
7273 need to strip array types here since the check for those types
7274 is already done within create_array_type_for_decl. */
7275 abstract_virtuals_error (decl
, type
);
7277 if (TREE_TYPE (decl
) == error_mark_node
)
7278 /* No initialization required. */
7280 else if (TREE_CODE (decl
) == FUNCTION_DECL
)
7284 if (init
== ridpointers
[(int)RID_DEFAULT
])
7286 /* An out-of-class default definition is defined at
7287 the point where it is explicitly defaulted. */
7288 if (DECL_DELETED_FN (decl
))
7289 maybe_explain_implicit_delete (decl
);
7290 else if (DECL_INITIAL (decl
) == error_mark_node
)
7291 synthesize_method (decl
);
7294 error ("function %q#D is initialized like a variable", decl
);
7296 /* else no initialization required. */
7298 else if (DECL_EXTERNAL (decl
)
7299 && ! (DECL_LANG_SPECIFIC (decl
)
7300 && DECL_NOT_REALLY_EXTERN (decl
)))
7303 DECL_INITIAL (decl
) = init
;
7305 /* A variable definition. */
7306 else if (DECL_FUNCTION_SCOPE_P (decl
) && !TREE_STATIC (decl
))
7307 /* Initialize the local variable. */
7308 initialize_local_var (decl
, init
);
7310 /* If a variable is defined, and then a subsequent
7311 definition with external linkage is encountered, we will
7312 get here twice for the same variable. We want to avoid
7313 calling expand_static_init more than once. For variables
7314 that are not static data members, we can call
7315 expand_static_init only when we actually process the
7316 initializer. It is not legal to redeclare a static data
7317 member, so this issue does not arise in that case. */
7318 else if (var_definition_p
&& TREE_STATIC (decl
))
7319 expand_static_init (decl
, init
);
7322 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
7323 reference, insert it in the statement-tree now. */
7327 FOR_EACH_VEC_ELT (*cleanups
, i
, t
)
7328 push_cleanup (decl
, t
, false);
7329 release_tree_vector (cleanups
);
7333 TREE_READONLY (decl
) = 1;
7337 && lookup_attribute ("omp declare target implicit",
7338 DECL_ATTRIBUTES (decl
)))
7340 DECL_ATTRIBUTES (decl
)
7341 = remove_attribute ("omp declare target implicit",
7342 DECL_ATTRIBUTES (decl
));
7343 complete_type (TREE_TYPE (decl
));
7344 if (!cp_omp_mappable_type (TREE_TYPE (decl
)))
7345 error ("%q+D in declare target directive does not have mappable type",
7347 else if (!lookup_attribute ("omp declare target",
7348 DECL_ATTRIBUTES (decl
))
7349 && !lookup_attribute ("omp declare target link",
7350 DECL_ATTRIBUTES (decl
)))
7351 DECL_ATTRIBUTES (decl
)
7352 = tree_cons (get_identifier ("omp declare target"),
7353 NULL_TREE
, DECL_ATTRIBUTES (decl
));
7356 invoke_plugin_callbacks (PLUGIN_FINISH_DECL
, decl
);
7359 /* For class TYPE return itself or some its bases that contain
7360 any direct non-static data members. Return error_mark_node if an
7361 error has been diagnosed. */
7364 find_decomp_class_base (location_t loc
, tree type
, tree ret
)
7366 bool member_seen
= false;
7367 for (tree field
= TYPE_FIELDS (type
); field
; field
= DECL_CHAIN (field
))
7368 if (TREE_CODE (field
) != FIELD_DECL
7369 || DECL_ARTIFICIAL (field
)
7370 || DECL_UNNAMED_BIT_FIELD (field
))
7374 else if (ANON_AGGR_TYPE_P (TREE_TYPE (field
)))
7376 if (TREE_CODE (TREE_TYPE (field
)) == RECORD_TYPE
)
7377 error_at (loc
, "cannot decompose class type %qT because it has an "
7378 "anonymous struct member", type
);
7380 error_at (loc
, "cannot decompose class type %qT because it has an "
7381 "anonymous union member", type
);
7382 inform (DECL_SOURCE_LOCATION (field
), "declared here");
7383 return error_mark_node
;
7385 else if (!accessible_p (type
, field
, true))
7387 error_at (loc
, "cannot decompose inaccessible member %qD of %qT",
7389 inform (DECL_SOURCE_LOCATION (field
),
7390 TREE_PRIVATE (field
)
7391 ? G_("declared private here")
7392 : G_("declared protected here"));
7393 return error_mark_node
;
7398 tree base_binfo
, binfo
;
7399 tree orig_ret
= ret
;
7403 for (binfo
= TYPE_BINFO (type
), i
= 0;
7404 BINFO_BASE_ITERATE (binfo
, i
, base_binfo
); i
++)
7406 tree t
= find_decomp_class_base (loc
, TREE_TYPE (base_binfo
), ret
);
7407 if (t
== error_mark_node
)
7408 return error_mark_node
;
7409 if (t
!= NULL_TREE
&& t
!= ret
)
7413 error_at (loc
, "cannot decompose class type %qT: both it and "
7414 "its base class %qT have non-static data members",
7416 return error_mark_node
;
7418 else if (orig_ret
!= NULL_TREE
)
7420 else if (ret
!= NULL_TREE
)
7422 error_at (loc
, "cannot decompose class type %qT: its base "
7423 "classes %qT and %qT have non-static data "
7424 "members", type
, ret
, t
);
7425 return error_mark_node
;
7434 /* Return std::tuple_size<TYPE>::value. */
7437 get_tuple_size (tree type
)
7439 tree args
= make_tree_vec (1);
7440 TREE_VEC_ELT (args
, 0) = type
;
7441 tree inst
= lookup_template_class (tuple_size_identifier
, args
,
7442 /*in_decl*/NULL_TREE
,
7443 /*context*/std_node
,
7444 /*entering_scope*/false, tf_none
);
7445 inst
= complete_type (inst
);
7446 if (inst
== error_mark_node
|| !COMPLETE_TYPE_P (inst
))
7448 tree val
= lookup_qualified_name (inst
, value_identifier
,
7449 /*type*/false, /*complain*/false);
7450 if (TREE_CODE (val
) == VAR_DECL
|| TREE_CODE (val
) == CONST_DECL
)
7451 val
= maybe_constant_value (val
);
7452 if (TREE_CODE (val
) == INTEGER_CST
)
7455 return error_mark_node
;
7458 /* Return std::tuple_element<I,TYPE>::type. */
7461 get_tuple_element_type (tree type
, unsigned i
)
7463 tree args
= make_tree_vec (2);
7464 TREE_VEC_ELT (args
, 0) = build_int_cst (integer_type_node
, i
);
7465 TREE_VEC_ELT (args
, 1) = type
;
7466 tree inst
= lookup_template_class (tuple_element_identifier
, args
,
7467 /*in_decl*/NULL_TREE
,
7468 /*context*/std_node
,
7469 /*entering_scope*/false,
7470 tf_warning_or_error
);
7471 return make_typename_type (inst
, type_identifier
,
7472 none_type
, tf_warning_or_error
);
7475 /* Return e.get<i>() or get<i>(e). */
7478 get_tuple_decomp_init (tree decl
, unsigned i
)
7480 tree targs
= make_tree_vec (1);
7481 TREE_VEC_ELT (targs
, 0) = build_int_cst (integer_type_node
, i
);
7483 tree etype
= TREE_TYPE (decl
);
7484 tree e
= convert_from_reference (decl
);
7486 /* [The id-expression] e is an lvalue if the type of the entity e is an
7487 lvalue reference and an xvalue otherwise. */
7488 if (!TYPE_REF_P (etype
)
7489 || TYPE_REF_IS_RVALUE (etype
))
7492 tree fns
= lookup_qualified_name (TREE_TYPE (e
), get__identifier
,
7493 /*type*/false, /*complain*/false);
7494 bool use_member_get
= false;
7496 /* To use a member get, member lookup must find at least one
7497 declaration that is a function template
7498 whose first template parameter is a non-type parameter. */
7499 for (lkp_iterator
iter (MAYBE_BASELINK_FUNCTIONS (fns
)); iter
; ++iter
)
7502 if (TREE_CODE (fn
) == TEMPLATE_DECL
)
7504 tree tparms
= DECL_TEMPLATE_PARMS (fn
);
7505 tree parm
= TREE_VEC_ELT (INNERMOST_TEMPLATE_PARMS (tparms
), 0);
7506 if (TREE_CODE (TREE_VALUE (parm
)) == PARM_DECL
)
7508 use_member_get
= true;
7516 fns
= lookup_template_function (fns
, targs
);
7517 return build_new_method_call (e
, fns
, /*args*/NULL
,
7518 /*path*/NULL_TREE
, LOOKUP_NORMAL
,
7519 /*fn_p*/NULL
, tf_warning_or_error
);
7523 vec
<tree
,va_gc
> *args
= make_tree_vector_single (e
);
7524 fns
= lookup_template_function (get__identifier
, targs
);
7525 fns
= perform_koenig_lookup (fns
, args
, tf_warning_or_error
);
7526 return finish_call_expr (fns
, &args
, /*novirt*/false,
7527 /*koenig*/true, tf_warning_or_error
);
7531 /* It's impossible to recover the decltype of a tuple decomposition variable
7532 based on the actual type of the variable, so store it in a hash table. */
7534 static GTY((cache
)) tree_cache_map
*decomp_type_table
;
7536 store_decomp_type (tree v
, tree t
)
7538 if (!decomp_type_table
)
7539 decomp_type_table
= tree_cache_map::create_ggc (13);
7540 decomp_type_table
->put (v
, t
);
7544 lookup_decomp_type (tree v
)
7546 return *decomp_type_table
->get (v
);
7549 /* Mangle a decomposition declaration if needed. Arguments like
7550 in cp_finish_decomp. */
7553 cp_maybe_mangle_decomp (tree decl
, tree first
, unsigned int count
)
7555 if (!processing_template_decl
7556 && !error_operand_p (decl
)
7557 && DECL_NAMESPACE_SCOPE_P (decl
))
7559 auto_vec
<tree
, 16> v
;
7560 v
.safe_grow (count
);
7562 for (unsigned int i
= 0; i
< count
; i
++, d
= DECL_CHAIN (d
))
7563 v
[count
- i
- 1] = d
;
7564 SET_DECL_ASSEMBLER_NAME (decl
, mangle_decomp (decl
, v
));
7565 maybe_apply_pragma_weak (decl
);
7569 /* Finish a decomposition declaration. DECL is the underlying declaration
7570 "e", FIRST is the head of a chain of decls for the individual identifiers
7571 chained through DECL_CHAIN in reverse order and COUNT is the number of
7575 cp_finish_decomp (tree decl
, tree first
, unsigned int count
)
7577 if (error_operand_p (decl
))
7582 TREE_TYPE (first
) = error_mark_node
;
7583 if (DECL_HAS_VALUE_EXPR_P (first
))
7585 SET_DECL_VALUE_EXPR (first
, NULL_TREE
);
7586 DECL_HAS_VALUE_EXPR_P (first
) = 0;
7588 first
= DECL_CHAIN (first
);
7590 if (DECL_P (decl
) && DECL_NAMESPACE_SCOPE_P (decl
))
7591 SET_DECL_ASSEMBLER_NAME (decl
, get_identifier ("<decomp>"));
7595 location_t loc
= DECL_SOURCE_LOCATION (decl
);
7596 if (type_dependent_expression_p (decl
)
7597 /* This happens for range for when not in templates.
7598 Still add the DECL_VALUE_EXPRs for later processing. */
7599 || (!processing_template_decl
7600 && type_uses_auto (TREE_TYPE (decl
))))
7602 for (unsigned int i
= 0; i
< count
; i
++)
7604 if (!DECL_HAS_VALUE_EXPR_P (first
))
7606 tree v
= build_nt (ARRAY_REF
, decl
,
7607 size_int (count
- i
- 1),
7608 NULL_TREE
, NULL_TREE
);
7609 SET_DECL_VALUE_EXPR (first
, v
);
7610 DECL_HAS_VALUE_EXPR_P (first
) = 1;
7612 if (processing_template_decl
)
7613 fit_decomposition_lang_decl (first
, decl
);
7614 first
= DECL_CHAIN (first
);
7619 auto_vec
<tree
, 16> v
;
7620 v
.safe_grow (count
);
7622 for (unsigned int i
= 0; i
< count
; i
++, d
= DECL_CHAIN (d
))
7624 v
[count
- i
- 1] = d
;
7625 fit_decomposition_lang_decl (d
, decl
);
7628 tree type
= TREE_TYPE (decl
);
7631 if (TYPE_REF_P (type
))
7633 dexp
= convert_from_reference (dexp
);
7634 type
= complete_type (TREE_TYPE (type
));
7635 if (type
== error_mark_node
)
7637 if (!COMPLETE_TYPE_P (type
))
7639 error_at (loc
, "structured binding refers to incomplete type %qT",
7645 tree eltype
= NULL_TREE
;
7646 unsigned HOST_WIDE_INT eltscnt
= 0;
7647 if (TREE_CODE (type
) == ARRAY_TYPE
)
7650 nelts
= array_type_nelts_top (type
);
7651 if (nelts
== error_mark_node
)
7653 if (!tree_fits_uhwi_p (nelts
))
7655 error_at (loc
, "cannot decompose variable length array %qT", type
);
7658 eltscnt
= tree_to_uhwi (nelts
);
7659 if (count
!= eltscnt
)
7662 if (count
> eltscnt
)
7663 error_n (loc
, count
,
7664 "%u name provided for structured binding",
7665 "%u names provided for structured binding", count
);
7667 error_n (loc
, count
,
7668 "only %u name provided for structured binding",
7669 "only %u names provided for structured binding", count
);
7670 inform_n (loc
, eltscnt
,
7671 "while %qT decomposes into %wu element",
7672 "while %qT decomposes into %wu elements",
7676 eltype
= TREE_TYPE (type
);
7677 for (unsigned int i
= 0; i
< count
; i
++)
7679 TREE_TYPE (v
[i
]) = eltype
;
7680 layout_decl (v
[i
], 0);
7681 if (processing_template_decl
)
7683 tree t
= unshare_expr (dexp
);
7684 t
= build4_loc (DECL_SOURCE_LOCATION (v
[i
]), ARRAY_REF
,
7685 eltype
, t
, size_int (i
), NULL_TREE
,
7687 SET_DECL_VALUE_EXPR (v
[i
], t
);
7688 DECL_HAS_VALUE_EXPR_P (v
[i
]) = 1;
7691 /* 2 GNU extensions. */
7692 else if (TREE_CODE (type
) == COMPLEX_TYPE
)
7695 if (count
!= eltscnt
)
7697 eltype
= cp_build_qualified_type (TREE_TYPE (type
), TYPE_QUALS (type
));
7698 for (unsigned int i
= 0; i
< count
; i
++)
7700 TREE_TYPE (v
[i
]) = eltype
;
7701 layout_decl (v
[i
], 0);
7702 if (processing_template_decl
)
7704 tree t
= unshare_expr (dexp
);
7705 t
= build1_loc (DECL_SOURCE_LOCATION (v
[i
]),
7706 i
? IMAGPART_EXPR
: REALPART_EXPR
, eltype
,
7708 SET_DECL_VALUE_EXPR (v
[i
], t
);
7709 DECL_HAS_VALUE_EXPR_P (v
[i
]) = 1;
7712 else if (TREE_CODE (type
) == VECTOR_TYPE
)
7714 if (!TYPE_VECTOR_SUBPARTS (type
).is_constant (&eltscnt
))
7716 error_at (loc
, "cannot decompose variable length vector %qT", type
);
7719 if (count
!= eltscnt
)
7721 eltype
= cp_build_qualified_type (TREE_TYPE (type
), TYPE_QUALS (type
));
7722 for (unsigned int i
= 0; i
< count
; i
++)
7724 TREE_TYPE (v
[i
]) = eltype
;
7725 layout_decl (v
[i
], 0);
7726 if (processing_template_decl
)
7728 tree t
= unshare_expr (dexp
);
7729 convert_vector_to_array_for_subscript (DECL_SOURCE_LOCATION (v
[i
]),
7731 t
= build4_loc (DECL_SOURCE_LOCATION (v
[i
]), ARRAY_REF
,
7732 eltype
, t
, size_int (i
), NULL_TREE
,
7734 SET_DECL_VALUE_EXPR (v
[i
], t
);
7735 DECL_HAS_VALUE_EXPR_P (v
[i
]) = 1;
7738 else if (tree tsize
= get_tuple_size (type
))
7740 if (tsize
== error_mark_node
)
7742 error_at (loc
, "%<std::tuple_size<%T>::value%> is not an integral "
7743 "constant expression", type
);
7746 if (!tree_fits_uhwi_p (tsize
))
7748 error_n (loc
, count
,
7749 "%u name provided for structured binding",
7750 "%u names provided for structured binding", count
);
7751 inform (loc
, "while %qT decomposes into %E elements",
7755 eltscnt
= tree_to_uhwi (tsize
);
7756 if (count
!= eltscnt
)
7758 int save_read
= DECL_READ_P (decl
);
7759 for (unsigned i
= 0; i
< count
; ++i
)
7761 location_t sloc
= input_location
;
7762 location_t dloc
= DECL_SOURCE_LOCATION (v
[i
]);
7764 input_location
= dloc
;
7765 tree init
= get_tuple_decomp_init (decl
, i
);
7766 tree eltype
= (init
== error_mark_node
? error_mark_node
7767 : get_tuple_element_type (type
, i
));
7768 input_location
= sloc
;
7770 if (init
== error_mark_node
|| eltype
== error_mark_node
)
7772 inform (dloc
, "in initialization of structured binding "
7773 "variable %qD", v
[i
]);
7776 /* Save the decltype away before reference collapse. */
7777 store_decomp_type (v
[i
], eltype
);
7778 eltype
= cp_build_reference_type (eltype
, !lvalue_p (init
));
7779 TREE_TYPE (v
[i
]) = eltype
;
7780 layout_decl (v
[i
], 0);
7781 if (DECL_HAS_VALUE_EXPR_P (v
[i
]))
7783 /* In this case the names are variables, not just proxies. */
7784 SET_DECL_VALUE_EXPR (v
[i
], NULL_TREE
);
7785 DECL_HAS_VALUE_EXPR_P (v
[i
]) = 0;
7787 if (!processing_template_decl
)
7788 cp_finish_decl (v
[i
], init
, /*constexpr*/false,
7789 /*asm*/NULL_TREE
, LOOKUP_NORMAL
);
7791 /* Ignore reads from the underlying decl performed during initialization
7792 of the individual variables. If those will be read, we'll mark
7793 the underlying decl as read at that point. */
7794 DECL_READ_P (decl
) = save_read
;
7796 else if (TREE_CODE (type
) == UNION_TYPE
)
7798 error_at (loc
, "cannot decompose union type %qT", type
);
7801 else if (!CLASS_TYPE_P (type
))
7803 error_at (loc
, "cannot decompose non-array non-class type %qT", type
);
7806 else if (LAMBDA_TYPE_P (type
))
7808 error_at (loc
, "cannot decompose lambda closure type %qT", type
);
7811 else if (processing_template_decl
&& !COMPLETE_TYPE_P (type
))
7812 pedwarn (loc
, 0, "structured binding refers to incomplete class type %qT",
7816 tree btype
= find_decomp_class_base (loc
, type
, NULL_TREE
);
7817 if (btype
== error_mark_node
)
7819 else if (btype
== NULL_TREE
)
7821 error_at (loc
, "cannot decompose class type %qT without non-static "
7822 "data members", type
);
7825 for (tree field
= TYPE_FIELDS (btype
); field
; field
= TREE_CHAIN (field
))
7826 if (TREE_CODE (field
) != FIELD_DECL
7827 || DECL_ARTIFICIAL (field
)
7828 || DECL_UNNAMED_BIT_FIELD (field
))
7832 if (count
!= eltscnt
)
7837 t
= convert_to_base (t
, btype
, /*check_access*/true,
7838 /*nonnull*/false, tf_warning_or_error
);
7842 for (tree field
= TYPE_FIELDS (btype
); field
; field
= TREE_CHAIN (field
))
7843 if (TREE_CODE (field
) != FIELD_DECL
7844 || DECL_ARTIFICIAL (field
)
7845 || DECL_UNNAMED_BIT_FIELD (field
))
7849 tree tt
= finish_non_static_data_member (field
, unshare_expr (t
),
7851 if (REFERENCE_REF_P (tt
))
7852 tt
= TREE_OPERAND (tt
, 0);
7853 TREE_TYPE (v
[i
]) = TREE_TYPE (tt
);
7854 layout_decl (v
[i
], 0);
7855 if (!processing_template_decl
)
7857 SET_DECL_VALUE_EXPR (v
[i
], tt
);
7858 DECL_HAS_VALUE_EXPR_P (v
[i
]) = 1;
7863 if (processing_template_decl
)
7865 for (unsigned int i
= 0; i
< count
; i
++)
7866 if (!DECL_HAS_VALUE_EXPR_P (v
[i
]))
7868 tree a
= build_nt (ARRAY_REF
, decl
, size_int (i
),
7869 NULL_TREE
, NULL_TREE
);
7870 SET_DECL_VALUE_EXPR (v
[i
], a
);
7871 DECL_HAS_VALUE_EXPR_P (v
[i
]) = 1;
7876 /* Returns a declaration for a VAR_DECL as if:
7878 extern "C" TYPE NAME;
7880 had been seen. Used to create compiler-generated global
7884 declare_global_var (tree name
, tree type
)
7888 push_to_top_level ();
7889 decl
= build_decl (input_location
, VAR_DECL
, name
, type
);
7890 TREE_PUBLIC (decl
) = 1;
7891 DECL_EXTERNAL (decl
) = 1;
7892 DECL_ARTIFICIAL (decl
) = 1;
7893 DECL_CONTEXT (decl
) = FROB_CONTEXT (global_namespace
);
7894 /* If the user has explicitly declared this variable (perhaps
7895 because the code we are compiling is part of a low-level runtime
7896 library), then it is possible that our declaration will be merged
7897 with theirs by pushdecl. */
7898 decl
= pushdecl (decl
);
7899 cp_finish_decl (decl
, NULL_TREE
, false, NULL_TREE
, 0);
7900 pop_from_top_level ();
7905 /* Returns the type for the argument to "__cxa_atexit" (or "atexit",
7906 if "__cxa_atexit" is not being used) corresponding to the function
7907 to be called when the program exits. */
7910 get_atexit_fn_ptr_type (void)
7914 if (!atexit_fn_ptr_type_node
)
7917 if (flag_use_cxa_atexit
7918 && !targetm
.cxx
.use_atexit_for_cxa_atexit ())
7919 /* The parameter to "__cxa_atexit" is "void (*)(void *)". */
7920 arg_type
= ptr_type_node
;
7922 /* The parameter to "atexit" is "void (*)(void)". */
7923 arg_type
= NULL_TREE
;
7925 fn_type
= build_function_type_list (void_type_node
,
7926 arg_type
, NULL_TREE
);
7927 atexit_fn_ptr_type_node
= build_pointer_type (fn_type
);
7930 return atexit_fn_ptr_type_node
;
7933 /* Returns a pointer to the `atexit' function. Note that if
7934 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
7935 `__cxa_atexit' function specified in the IA64 C++ ABI. */
7938 get_atexit_node (void)
7944 bool use_aeabi_atexit
;
7949 if (flag_use_cxa_atexit
&& !targetm
.cxx
.use_atexit_for_cxa_atexit ())
7951 /* The declaration for `__cxa_atexit' is:
7953 int __cxa_atexit (void (*)(void *), void *, void *)
7955 We build up the argument types and then the function type
7957 tree argtype0
, argtype1
, argtype2
;
7959 use_aeabi_atexit
= targetm
.cxx
.use_aeabi_atexit ();
7960 /* First, build the pointer-to-function type for the first
7962 fn_ptr_type
= get_atexit_fn_ptr_type ();
7963 /* Then, build the rest of the argument types. */
7964 argtype2
= ptr_type_node
;
7965 if (use_aeabi_atexit
)
7967 argtype1
= fn_ptr_type
;
7968 argtype0
= ptr_type_node
;
7972 argtype1
= ptr_type_node
;
7973 argtype0
= fn_ptr_type
;
7975 /* And the final __cxa_atexit type. */
7976 fn_type
= build_function_type_list (integer_type_node
,
7977 argtype0
, argtype1
, argtype2
,
7979 if (use_aeabi_atexit
)
7980 name
= "__aeabi_atexit";
7982 name
= "__cxa_atexit";
7986 /* The declaration for `atexit' is:
7988 int atexit (void (*)());
7990 We build up the argument types and then the function type
7992 fn_ptr_type
= get_atexit_fn_ptr_type ();
7993 /* Build the final atexit type. */
7994 fn_type
= build_function_type_list (integer_type_node
,
7995 fn_ptr_type
, NULL_TREE
);
7999 /* Now, build the function declaration. */
8000 push_lang_context (lang_name_c
);
8001 atexit_fndecl
= build_library_fn_ptr (name
, fn_type
, ECF_LEAF
| ECF_NOTHROW
);
8002 mark_used (atexit_fndecl
);
8003 pop_lang_context ();
8004 atexit_node
= decay_conversion (atexit_fndecl
, tf_warning_or_error
);
8009 /* Like get_atexit_node, but for thread-local cleanups. */
8012 get_thread_atexit_node (void)
8014 /* The declaration for `__cxa_thread_atexit' is:
8016 int __cxa_thread_atexit (void (*)(void *), void *, void *) */
8017 tree fn_type
= build_function_type_list (integer_type_node
,
8018 get_atexit_fn_ptr_type (),
8019 ptr_type_node
, ptr_type_node
,
8022 /* Now, build the function declaration. */
8023 tree atexit_fndecl
= build_library_fn_ptr ("__cxa_thread_atexit", fn_type
,
8024 ECF_LEAF
| ECF_NOTHROW
);
8025 return decay_conversion (atexit_fndecl
, tf_warning_or_error
);
8028 /* Returns the __dso_handle VAR_DECL. */
8031 get_dso_handle_node (void)
8033 if (dso_handle_node
)
8034 return dso_handle_node
;
8036 /* Declare the variable. */
8037 dso_handle_node
= declare_global_var (get_identifier ("__dso_handle"),
8040 #ifdef HAVE_GAS_HIDDEN
8041 if (dso_handle_node
!= error_mark_node
)
8043 DECL_VISIBILITY (dso_handle_node
) = VISIBILITY_HIDDEN
;
8044 DECL_VISIBILITY_SPECIFIED (dso_handle_node
) = 1;
8048 return dso_handle_node
;
8051 /* Begin a new function with internal linkage whose job will be simply
8052 to destroy some particular variable. */
8054 static GTY(()) int start_cleanup_cnt
;
8057 start_cleanup_fn (void)
8062 bool use_cxa_atexit
= flag_use_cxa_atexit
8063 && !targetm
.cxx
.use_atexit_for_cxa_atexit ();
8065 push_to_top_level ();
8067 /* No need to mangle this. */
8068 push_lang_context (lang_name_c
);
8070 /* Build the name of the function. */
8071 sprintf (name
, "__tcf_%d", start_cleanup_cnt
++);
8072 /* Build the function declaration. */
8073 fntype
= TREE_TYPE (get_atexit_fn_ptr_type ());
8074 fndecl
= build_lang_decl (FUNCTION_DECL
, get_identifier (name
), fntype
);
8075 /* It's a function with internal linkage, generated by the
8077 TREE_PUBLIC (fndecl
) = 0;
8078 DECL_ARTIFICIAL (fndecl
) = 1;
8079 /* Make the function `inline' so that it is only emitted if it is
8080 actually needed. It is unlikely that it will be inlined, since
8081 it is only called via a function pointer, but we avoid unnecessary
8082 emissions this way. */
8083 DECL_DECLARED_INLINE_P (fndecl
) = 1;
8084 DECL_INTERFACE_KNOWN (fndecl
) = 1;
8085 /* Build the parameter. */
8088 tree parmdecl
= cp_build_parm_decl (fndecl
, NULL_TREE
, ptr_type_node
);
8089 TREE_USED (parmdecl
) = 1;
8090 DECL_READ_P (parmdecl
) = 1;
8091 DECL_ARGUMENTS (fndecl
) = parmdecl
;
8095 start_preparsed_function (fndecl
, NULL_TREE
, SF_PRE_PARSED
);
8097 pop_lang_context ();
8099 return current_function_decl
;
8102 /* Finish the cleanup function begun by start_cleanup_fn. */
8105 end_cleanup_fn (void)
8107 expand_or_defer_fn (finish_function (/*inline_p=*/false));
8109 pop_from_top_level ();
8112 /* Generate code to handle the destruction of DECL, an object with
8113 static storage duration. */
8116 register_dtor_fn (tree decl
)
8123 bool ob_parm
, dso_parm
, use_dtor
;
8124 tree arg0
, arg1
, arg2
;
8127 type
= TREE_TYPE (decl
);
8128 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type
))
8131 /* If we're using "__cxa_atexit" (or "__cxa_thread_atexit" or
8132 "__aeabi_atexit"), and DECL is a class object, we can just pass the
8133 destructor to "__cxa_atexit"; we don't have to build a temporary
8134 function to do the cleanup. */
8135 dso_parm
= (flag_use_cxa_atexit
8136 && !targetm
.cxx
.use_atexit_for_cxa_atexit ());
8137 ob_parm
= (CP_DECL_THREAD_LOCAL_P (decl
) || dso_parm
);
8138 use_dtor
= ob_parm
&& CLASS_TYPE_P (type
);
8141 cleanup
= get_class_binding (type
, complete_dtor_identifier
);
8143 /* Make sure it is accessible. */
8144 perform_or_defer_access_check (TYPE_BINFO (type
), cleanup
, cleanup
,
8145 tf_warning_or_error
);
8149 /* Call build_cleanup before we enter the anonymous function so
8150 that any access checks will be done relative to the current
8151 scope, rather than the scope of the anonymous function. */
8152 build_cleanup (decl
);
8154 /* Now start the function. */
8155 cleanup
= start_cleanup_fn ();
8157 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
8158 to the original function, rather than the anonymous one. That
8159 will make the back end think that nested functions are in use,
8160 which causes confusion. */
8161 push_deferring_access_checks (dk_no_check
);
8162 fcall
= build_cleanup (decl
);
8163 pop_deferring_access_checks ();
8165 /* Create the body of the anonymous function. */
8166 compound_stmt
= begin_compound_stmt (BCS_FN_BODY
);
8167 finish_expr_stmt (fcall
);
8168 finish_compound_stmt (compound_stmt
);
8172 /* Call atexit with the cleanup function. */
8173 mark_used (cleanup
);
8174 cleanup
= build_address (cleanup
);
8176 if (CP_DECL_THREAD_LOCAL_P (decl
))
8177 atex_node
= get_thread_atexit_node ();
8179 atex_node
= get_atexit_node ();
8183 /* We must convert CLEANUP to the type that "__cxa_atexit"
8185 cleanup
= build_nop (get_atexit_fn_ptr_type (), cleanup
);
8186 /* "__cxa_atexit" will pass the address of DECL to the
8187 cleanup function. */
8189 addr
= build_address (decl
);
8190 /* The declared type of the parameter to "__cxa_atexit" is
8191 "void *". For plain "T*", we could just let the
8192 machinery in cp_build_function_call convert it -- but if the
8193 type is "cv-qualified T *", then we need to convert it
8194 before passing it in, to avoid spurious errors. */
8195 addr
= build_nop (ptr_type_node
, addr
);
8198 /* Since the cleanup functions we build ignore the address
8199 they're given, there's no reason to pass the actual address
8200 in, and, in general, it's cheaper to pass NULL than any
8202 addr
= null_pointer_node
;
8205 arg2
= cp_build_addr_expr (get_dso_handle_node (),
8206 tf_warning_or_error
);
8208 /* Just pass NULL to the dso handle parm if we don't actually
8209 have a DSO handle on this target. */
8210 arg2
= null_pointer_node
;
8216 if (!CP_DECL_THREAD_LOCAL_P (decl
)
8217 && targetm
.cxx
.use_aeabi_atexit ())
8233 return cp_build_function_call_nary (atex_node
, tf_warning_or_error
,
8234 arg0
, arg1
, arg2
, NULL_TREE
);
8237 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
8238 is its initializer. Generate code to handle the construction
8239 and destruction of DECL. */
8242 expand_static_init (tree decl
, tree init
)
8244 gcc_assert (VAR_P (decl
));
8245 gcc_assert (TREE_STATIC (decl
));
8247 /* Some variables require no dynamic initialization. */
8248 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl
)))
8250 /* Make sure the destructor is callable. */
8251 cxx_maybe_build_cleanup (decl
, tf_warning_or_error
);
8256 if (CP_DECL_THREAD_LOCAL_P (decl
) && DECL_GNU_TLS_P (decl
)
8257 && !DECL_FUNCTION_SCOPE_P (decl
))
8259 location_t dloc
= DECL_SOURCE_LOCATION (decl
);
8261 error_at (dloc
, "non-local variable %qD declared %<__thread%> "
8262 "needs dynamic initialization", decl
);
8264 error_at (dloc
, "non-local variable %qD declared %<__thread%> "
8265 "has a non-trivial destructor", decl
);
8266 static bool informed
;
8269 inform (dloc
, "C++11 %<thread_local%> allows dynamic "
8270 "initialization and destruction");
8276 if (DECL_FUNCTION_SCOPE_P (decl
))
8278 /* Emit code to perform this initialization but once. */
8279 tree if_stmt
= NULL_TREE
, inner_if_stmt
= NULL_TREE
;
8280 tree then_clause
= NULL_TREE
, inner_then_clause
= NULL_TREE
;
8281 tree guard
, guard_addr
;
8283 /* We don't need thread-safety code for thread-local vars. */
8284 bool thread_guard
= (flag_threadsafe_statics
8285 && !CP_DECL_THREAD_LOCAL_P (decl
));
8287 /* Emit code to perform this initialization but once. This code
8290 static <type> guard;
8291 if (!__atomic_load (guard.first_byte)) {
8292 if (__cxa_guard_acquire (&guard)) {
8295 // Do initialization.
8296 flag = true; __cxa_guard_release (&guard);
8297 // Register variable for destruction at end of program.
8299 if (!flag) __cxa_guard_abort (&guard);
8304 Note that the `flag' variable is only set to 1 *after* the
8305 initialization is complete. This ensures that an exception,
8306 thrown during the construction, will cause the variable to
8307 reinitialized when we pass through this code again, as per:
8311 If the initialization exits by throwing an exception, the
8312 initialization is not complete, so it will be tried again
8313 the next time control enters the declaration.
8315 This process should be thread-safe, too; multiple threads
8316 should not be able to initialize the variable more than
8319 /* Create the guard variable. */
8320 guard
= get_guard (decl
);
8322 /* Begin the conditional initialization. */
8323 if_stmt
= begin_if_stmt ();
8325 finish_if_stmt_cond (get_guard_cond (guard
, thread_guard
), if_stmt
);
8326 then_clause
= begin_compound_stmt (BCS_NO_SCOPE
);
8330 tree vfntype
= NULL_TREE
;
8331 tree acquire_name
, release_name
, abort_name
;
8332 tree acquire_fn
, release_fn
, abort_fn
;
8333 guard_addr
= build_address (guard
);
8335 acquire_name
= get_identifier ("__cxa_guard_acquire");
8336 release_name
= get_identifier ("__cxa_guard_release");
8337 abort_name
= get_identifier ("__cxa_guard_abort");
8338 acquire_fn
= get_global_binding (acquire_name
);
8339 release_fn
= get_global_binding (release_name
);
8340 abort_fn
= get_global_binding (abort_name
);
8342 acquire_fn
= push_library_fn
8343 (acquire_name
, build_function_type_list (integer_type_node
,
8344 TREE_TYPE (guard_addr
),
8346 NULL_TREE
, ECF_NOTHROW
| ECF_LEAF
);
8347 if (!release_fn
|| !abort_fn
)
8348 vfntype
= build_function_type_list (void_type_node
,
8349 TREE_TYPE (guard_addr
),
8352 release_fn
= push_library_fn (release_name
, vfntype
, NULL_TREE
,
8353 ECF_NOTHROW
| ECF_LEAF
);
8355 abort_fn
= push_library_fn (abort_name
, vfntype
, NULL_TREE
,
8356 ECF_NOTHROW
| ECF_LEAF
);
8358 inner_if_stmt
= begin_if_stmt ();
8359 finish_if_stmt_cond (build_call_n (acquire_fn
, 1, guard_addr
),
8362 inner_then_clause
= begin_compound_stmt (BCS_NO_SCOPE
);
8363 begin
= get_target_expr (boolean_false_node
);
8364 flag
= TARGET_EXPR_SLOT (begin
);
8366 TARGET_EXPR_CLEANUP (begin
)
8367 = build3 (COND_EXPR
, void_type_node
, flag
,
8369 build_call_n (abort_fn
, 1, guard_addr
));
8370 CLEANUP_EH_ONLY (begin
) = 1;
8372 /* Do the initialization itself. */
8373 init
= add_stmt_to_compound (begin
, init
);
8374 init
= add_stmt_to_compound
8375 (init
, build2 (MODIFY_EXPR
, void_type_node
, flag
, boolean_true_node
));
8376 init
= add_stmt_to_compound
8377 (init
, build_call_n (release_fn
, 1, guard_addr
));
8380 init
= add_stmt_to_compound (init
, set_guard (guard
));
8382 /* Use atexit to register a function for destroying this static
8384 init
= add_stmt_to_compound (init
, register_dtor_fn (decl
));
8386 finish_expr_stmt (init
);
8390 finish_compound_stmt (inner_then_clause
);
8391 finish_then_clause (inner_if_stmt
);
8392 finish_if_stmt (inner_if_stmt
);
8395 finish_compound_stmt (then_clause
);
8396 finish_then_clause (if_stmt
);
8397 finish_if_stmt (if_stmt
);
8399 else if (CP_DECL_THREAD_LOCAL_P (decl
))
8400 tls_aggregates
= tree_cons (init
, decl
, tls_aggregates
);
8402 static_aggregates
= tree_cons (init
, decl
, static_aggregates
);
8406 /* Make TYPE a complete type based on INITIAL_VALUE.
8407 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
8408 2 if there was no information (in which case assume 0 if DO_DEFAULT),
8409 3 if the initializer list is empty (in pedantic mode). */
8412 cp_complete_array_type (tree
*ptype
, tree initial_value
, bool do_default
)
8415 tree type
, elt_type
;
8417 /* Don't get confused by a CONSTRUCTOR for some other type. */
8418 if (initial_value
&& TREE_CODE (initial_value
) == CONSTRUCTOR
8419 && !BRACE_ENCLOSED_INITIALIZER_P (initial_value
)
8420 && TREE_CODE (TREE_TYPE (initial_value
)) != ARRAY_TYPE
)
8425 unsigned HOST_WIDE_INT i
;
8428 /* An array of character type can be initialized from a
8429 brace-enclosed string constant.
8431 FIXME: this code is duplicated from reshape_init. Probably
8432 we should just call reshape_init here? */
8433 if (char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (*ptype
)))
8434 && TREE_CODE (initial_value
) == CONSTRUCTOR
8435 && !vec_safe_is_empty (CONSTRUCTOR_ELTS (initial_value
)))
8437 vec
<constructor_elt
, va_gc
> *v
= CONSTRUCTOR_ELTS (initial_value
);
8438 tree value
= (*v
)[0].value
;
8439 STRIP_ANY_LOCATION_WRAPPER (value
);
8441 if (TREE_CODE (value
) == STRING_CST
8442 && v
->length () == 1)
8443 initial_value
= value
;
8446 /* If any of the elements are parameter packs, we can't actually
8447 complete this type now because the array size is dependent. */
8448 if (TREE_CODE (initial_value
) == CONSTRUCTOR
)
8450 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (initial_value
),
8453 if (PACK_EXPANSION_P (value
))
8459 failure
= complete_array_type (ptype
, initial_value
, do_default
);
8461 /* We can create the array before the element type is complete, which
8462 means that we didn't have these two bits set in the original type
8463 either. In completing the type, we are expected to propagate these
8464 bits. See also complete_type which does the same thing for arrays
8467 if (type
!= error_mark_node
&& TYPE_DOMAIN (type
))
8469 elt_type
= TREE_TYPE (type
);
8470 TYPE_NEEDS_CONSTRUCTING (type
) = TYPE_NEEDS_CONSTRUCTING (elt_type
);
8471 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type
)
8472 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (elt_type
);
8478 /* As above, but either give an error or reject zero-size arrays, depending
8482 cp_complete_array_type_or_error (tree
*ptype
, tree initial_value
,
8483 bool do_default
, tsubst_flags_t complain
)
8486 bool sfinae
= !(complain
& tf_error
);
8487 /* In SFINAE context we can't be lenient about zero-size arrays. */
8490 failure
= cp_complete_array_type (ptype
, initial_value
, do_default
);
8496 /* Not an error. */;
8497 else if (failure
== 1)
8498 error ("initializer fails to determine size of %qT", *ptype
);
8499 else if (failure
== 2)
8502 error ("array size missing in %qT", *ptype
);
8504 else if (failure
== 3)
8505 error ("zero-size array %qT", *ptype
);
8506 *ptype
= error_mark_node
;
8511 /* Return zero if something is declared to be a member of type
8512 CTYPE when in the context of CUR_TYPE. STRING is the error
8513 message to print in that case. Otherwise, quietly return 1. */
8516 member_function_or_else (tree ctype
, tree cur_type
, enum overload_flags flags
)
8518 if (ctype
&& ctype
!= cur_type
)
8520 if (flags
== DTOR_FLAG
)
8521 error ("destructor for alien class %qT cannot be a member", ctype
);
8523 error ("constructor for alien class %qT cannot be a member", ctype
);
8529 /* Subroutine of `grokdeclarator'. */
8531 /* Generate errors possibly applicable for a given set of specifiers.
8532 This is for ARM $7.1.2. */
8535 bad_specifiers (tree object
,
8536 enum bad_spec_place type
,
8542 const location_t
* locations
)
8548 error_at (locations
[ds_virtual
],
8549 "%qD declared as a %<virtual%> variable", object
);
8551 error ("%<const%> and %<volatile%> function specifiers on "
8552 "%qD invalid in variable declaration", object
);
8556 error_at (locations
[ds_virtual
],
8557 "%qD declared as a %<virtual%> parameter", object
);
8559 error_at (locations
[ds_inline
],
8560 "%qD declared as an %<inline%> parameter", object
);
8562 error ("%<const%> and %<volatile%> function specifiers on "
8563 "%qD invalid in parameter declaration", object
);
8567 error_at (locations
[ds_virtual
],
8568 "%qD declared as a %<virtual%> type", object
);
8570 error_at (locations
[ds_inline
],
8571 "%qD declared as an %<inline%> type", object
);
8573 error ("%<const%> and %<volatile%> function specifiers on "
8574 "%qD invalid in type declaration", object
);
8578 error_at (locations
[ds_virtual
],
8579 "%qD declared as a %<virtual%> field", object
);
8581 error_at (locations
[ds_inline
],
8582 "%qD declared as an %<inline%> field", object
);
8584 error ("%<const%> and %<volatile%> function specifiers on "
8585 "%qD invalid in field declaration", object
);
8591 error ("%q+D declared as a friend", object
);
8593 && !flag_noexcept_type
8594 && (TREE_CODE (object
) == TYPE_DECL
8595 || (!TYPE_PTRFN_P (TREE_TYPE (object
))
8596 && !TYPE_REFFN_P (TREE_TYPE (object
))
8597 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (object
)))))
8598 error ("%q+D declared with an exception specification", object
);
8601 /* DECL is a member function or static data member and is presently
8602 being defined. Check that the definition is taking place in a
8606 check_class_member_definition_namespace (tree decl
)
8608 /* These checks only apply to member functions and static data
8610 gcc_assert (VAR_OR_FUNCTION_DECL_P (decl
));
8611 /* We check for problems with specializations in pt.c in
8612 check_specialization_namespace, where we can issue better
8614 if (processing_specialization
)
8616 /* We check this in check_explicit_instantiation_namespace. */
8617 if (processing_explicit_instantiation
)
8621 A member function definition that appears outside of the
8622 class definition shall appear in a namespace scope enclosing
8623 the class definition.
8627 The definition for a static data member shall appear in a
8628 namespace scope enclosing the member's class definition. */
8629 if (!is_ancestor (current_namespace
, DECL_CONTEXT (decl
)))
8630 permerror (input_location
, "definition of %qD is not in namespace enclosing %qT",
8631 decl
, DECL_CONTEXT (decl
));
8634 /* Build a PARM_DECL for the "this" parameter of FN. TYPE is the
8635 METHOD_TYPE for a non-static member function; QUALS are the
8636 cv-qualifiers that apply to the function. */
8639 build_this_parm (tree fn
, tree type
, cp_cv_quals quals
)
8644 cp_cv_quals this_quals
;
8646 if (CLASS_TYPE_P (type
))
8649 = cp_build_qualified_type (type
, quals
& ~TYPE_QUAL_RESTRICT
);
8650 this_type
= build_pointer_type (this_type
);
8653 this_type
= type_of_this_parm (type
);
8654 /* The `this' parameter is implicitly `const'; it cannot be
8656 this_quals
= (quals
& TYPE_QUAL_RESTRICT
) | TYPE_QUAL_CONST
;
8657 qual_type
= cp_build_qualified_type (this_type
, this_quals
);
8658 parm
= build_artificial_parm (fn
, this_identifier
, qual_type
);
8659 cp_apply_type_quals_to_decl (this_quals
, parm
);
8663 /* DECL is a static member function. Complain if it was declared
8664 with function-cv-quals. */
8667 check_static_quals (tree decl
, cp_cv_quals quals
)
8669 if (quals
!= TYPE_UNQUALIFIED
)
8670 error ("static member function %q#D declared with type qualifiers",
8674 // Check that FN takes no arguments and returns bool.
8676 check_concept_fn (tree fn
)
8678 // A constraint is nullary.
8679 if (DECL_ARGUMENTS (fn
))
8680 error_at (DECL_SOURCE_LOCATION (fn
),
8681 "concept %q#D declared with function parameters", fn
);
8683 // The declared return type of the concept shall be bool, and
8684 // it shall not be deduced from it definition.
8685 tree type
= TREE_TYPE (TREE_TYPE (fn
));
8687 error_at (DECL_SOURCE_LOCATION (fn
),
8688 "concept %q#D declared with a deduced return type", fn
);
8689 else if (type
!= boolean_type_node
)
8690 error_at (DECL_SOURCE_LOCATION (fn
),
8691 "concept %q#D with non-%<bool%> return type %qT", fn
, type
);
8694 /* Helper function. Replace the temporary this parameter injected
8695 during cp_finish_omp_declare_simd with the real this parameter. */
8698 declare_simd_adjust_this (tree
*tp
, int *walk_subtrees
, void *data
)
8700 tree this_parm
= (tree
) data
;
8701 if (TREE_CODE (*tp
) == PARM_DECL
8702 && DECL_NAME (*tp
) == this_identifier
8703 && *tp
!= this_parm
)
8705 else if (TYPE_P (*tp
))
8710 /* CTYPE is class type, or null if non-class.
8711 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
8713 DECLARATOR is the function's name.
8714 PARMS is a chain of PARM_DECLs for the function.
8715 VIRTUALP is truthvalue of whether the function is virtual or not.
8716 FLAGS are to be passed through to `grokclassfn'.
8717 QUALS are qualifiers indicating whether the function is `const'
8719 RAISES is a list of exceptions that this function can raise.
8720 CHECK is 1 if we must find this method in CTYPE, 0 if we should
8721 not look, and -1 if we should not call `grokclassfn' at all.
8723 SFK is the kind of special function (if any) for the new function.
8725 Returns `NULL_TREE' if something goes wrong, after issuing
8726 applicable error messages. */
8729 grokfndecl (tree ctype
,
8733 tree orig_declarator
,
8734 const cp_decl_specifier_seq
*declspecs
,
8737 enum overload_flags flags
,
8739 cp_ref_qualifier rqual
,
8746 special_function_kind sfk
,
8748 bool late_return_type_p
,
8752 location_t location
)
8755 int staticp
= ctype
&& TREE_CODE (type
) == FUNCTION_TYPE
;
8758 if (location
== UNKNOWN_LOCATION
)
8759 location
= input_location
;
8761 // Was the concept specifier present?
8762 bool concept_p
= inlinep
& 4;
8764 // Concept declarations must have a corresponding definition.
8765 if (concept_p
&& !funcdef_flag
)
8767 error_at (location
, "concept %qD has no definition", declarator
);
8771 type
= build_cp_fntype_variant (type
, rqual
, raises
, late_return_type_p
);
8773 decl
= build_lang_decl_loc (location
, FUNCTION_DECL
, declarator
, type
);
8775 /* Set the constraints on the declaration. */
8778 tree tmpl_reqs
= NULL_TREE
;
8779 if (processing_template_decl
> template_class_depth (ctype
))
8780 tmpl_reqs
= TEMPLATE_PARMS_CONSTRAINTS (current_template_parms
);
8782 /* Adjust the required expression into a constraint. */
8784 decl_reqs
= normalize_expression (decl_reqs
);
8786 tree ci
= build_constraints (tmpl_reqs
, decl_reqs
);
8787 set_constraints (decl
, ci
);
8790 if (TREE_CODE (type
) == METHOD_TYPE
)
8792 tree parm
= build_this_parm (decl
, type
, quals
);
8793 DECL_CHAIN (parm
) = parms
;
8796 /* Allocate space to hold the vptr bit if needed. */
8797 SET_DECL_ALIGN (decl
, MINIMUM_METHOD_BOUNDARY
);
8800 DECL_ARGUMENTS (decl
) = parms
;
8801 for (t
= parms
; t
; t
= DECL_CHAIN (t
))
8802 DECL_CONTEXT (t
) = decl
;
8804 /* Propagate volatile out from type to decl. */
8805 if (TYPE_VOLATILE (type
))
8806 TREE_THIS_VOLATILE (decl
) = 1;
8808 /* Setup decl according to sfk. */
8811 case sfk_constructor
:
8812 case sfk_copy_constructor
:
8813 case sfk_move_constructor
:
8814 DECL_CXX_CONSTRUCTOR_P (decl
) = 1;
8815 DECL_NAME (decl
) = ctor_identifier
;
8817 case sfk_destructor
:
8818 DECL_CXX_DESTRUCTOR_P (decl
) = 1;
8819 DECL_NAME (decl
) = dtor_identifier
;
8825 if (friendp
&& TREE_CODE (orig_declarator
) == TEMPLATE_ID_EXPR
)
8829 "defining explicit specialization %qD in friend declaration",
8833 tree fns
= TREE_OPERAND (orig_declarator
, 0);
8834 tree args
= TREE_OPERAND (orig_declarator
, 1);
8836 if (PROCESSING_REAL_TEMPLATE_DECL_P ())
8838 /* Something like `template <class T> friend void f<T>()'. */
8840 "invalid use of template-id %qD in declaration "
8841 "of primary template",
8847 /* A friend declaration of the form friend void f<>(). Record
8848 the information in the TEMPLATE_ID_EXPR. */
8849 SET_DECL_IMPLICIT_INSTANTIATION (decl
);
8851 gcc_assert (identifier_p (fns
)
8852 || TREE_CODE (fns
) == OVERLOAD
8853 || TREE_CODE (fns
) == FUNCTION_DECL
);
8854 DECL_TEMPLATE_INFO (decl
) = build_template_info (fns
, args
);
8856 for (t
= TYPE_ARG_TYPES (TREE_TYPE (decl
)); t
; t
= TREE_CHAIN (t
))
8857 if (TREE_PURPOSE (t
)
8858 && TREE_CODE (TREE_PURPOSE (t
)) == DEFAULT_ARG
)
8860 error_at (defarg_location (TREE_PURPOSE (t
)),
8861 "default arguments are not allowed in declaration "
8862 "of friend template specialization %qD",
8869 error_at (declspecs
->locations
[ds_inline
],
8870 "%<inline%> is not allowed in declaration of friend "
8871 "template specialization %qD",
8878 /* C++17 11.3.6/4: "If a friend declaration specifies a default argument
8879 expression, that declaration shall be a definition..." */
8880 if (friendp
&& !funcdef_flag
)
8882 for (tree t
= FUNCTION_FIRST_USER_PARMTYPE (decl
);
8883 t
&& t
!= void_list_node
; t
= TREE_CHAIN (t
))
8884 if (TREE_PURPOSE (t
))
8886 permerror (DECL_SOURCE_LOCATION (decl
),
8887 "friend declaration of %qD specifies default "
8888 "arguments and isn't a definition", decl
);
8893 /* If this decl has namespace scope, set that up. */
8895 set_decl_namespace (decl
, in_namespace
, friendp
);
8897 DECL_CONTEXT (decl
) = FROB_CONTEXT (current_decl_namespace ());
8899 /* `main' and builtins have implicit 'C' linkage. */
8900 if (ctype
== NULL_TREE
8901 && DECL_FILE_SCOPE_P (decl
)
8902 && current_lang_name
== lang_name_cplusplus
8903 && (MAIN_NAME_P (declarator
)
8904 || (IDENTIFIER_LENGTH (declarator
) > 10
8905 && IDENTIFIER_POINTER (declarator
)[0] == '_'
8906 && IDENTIFIER_POINTER (declarator
)[1] == '_'
8907 && strncmp (IDENTIFIER_POINTER (declarator
)+2,
8908 "builtin_", 8) == 0)
8909 || (targetcm
.cxx_implicit_extern_c
8910 && (targetcm
.cxx_implicit_extern_c
8911 (IDENTIFIER_POINTER (declarator
))))))
8912 SET_DECL_LANGUAGE (decl
, lang_c
);
8914 /* Should probably propagate const out from type to decl I bet (mrs). */
8917 DECL_STATIC_FUNCTION_P (decl
) = 1;
8918 DECL_CONTEXT (decl
) = ctype
;
8922 DECL_DELETED_FN (decl
) = 1;
8926 DECL_CONTEXT (decl
) = ctype
;
8928 check_class_member_definition_namespace (decl
);
8931 if (ctype
== NULL_TREE
&& DECL_MAIN_P (decl
))
8933 if (PROCESSING_REAL_TEMPLATE_DECL_P())
8934 error_at (location
, "cannot declare %<::main%> to be a template");
8936 error_at (declspecs
->locations
[ds_inline
],
8937 "cannot declare %<::main%> to be inline");
8939 error_at (declspecs
->locations
[ds_constexpr
],
8940 "cannot declare %<::main%> to be %<constexpr%>");
8942 error_at (location
, "cannot declare %<::main%> to be static");
8947 /* Members of anonymous types and local classes have no linkage; make
8948 them internal. If a typedef is made later, this will be changed. */
8949 if (ctype
&& (!TREE_PUBLIC (TYPE_MAIN_DECL (ctype
))
8950 || decl_function_context (TYPE_MAIN_DECL (ctype
))))
8953 if (publicp
&& cxx_dialect
== cxx98
)
8955 /* [basic.link]: A name with no linkage (notably, the name of a class
8956 or enumeration declared in a local scope) shall not be used to
8957 declare an entity with linkage.
8959 DR 757 relaxes this restriction for C++0x. */
8960 no_linkage_error (decl
);
8963 TREE_PUBLIC (decl
) = publicp
;
8966 DECL_INTERFACE_KNOWN (decl
) = 1;
8967 DECL_NOT_REALLY_EXTERN (decl
) = 1;
8970 /* If the declaration was declared inline, mark it as such. */
8973 DECL_DECLARED_INLINE_P (decl
) = 1;
8975 DECL_COMDAT (decl
) = 1;
8978 DECL_DECLARED_CONSTEXPR_P (decl
) = true;
8980 // If the concept declaration specifier was found, check
8981 // that the declaration satisfies the necessary requirements.
8984 DECL_DECLARED_CONCEPT_P (decl
) = true;
8985 check_concept_fn (decl
);
8988 DECL_EXTERNAL (decl
) = 1;
8989 if (TREE_CODE (type
) == FUNCTION_TYPE
)
8992 TREE_TYPE (decl
) = apply_memfn_quals (TREE_TYPE (decl
),
8999 ? G_("static member function %qD cannot have cv-qualifier")
9000 : G_("non-member function %qD cannot have cv-qualifier"),
9002 quals
= TYPE_UNQUALIFIED
;
9008 ? G_("static member function %qD cannot have ref-qualifier")
9009 : G_("non-member function %qD cannot have ref-qualifier"),
9011 rqual
= REF_QUAL_NONE
;
9015 if (deduction_guide_p (decl
))
9017 if (!DECL_NAMESPACE_SCOPE_P (decl
))
9019 error_at (location
, "deduction guide %qD must be declared at "
9020 "namespace scope", decl
);
9025 "deduction guide %qD must not have a function body", decl
);
9027 else if (IDENTIFIER_ANY_OP_P (DECL_NAME (decl
))
9028 && !grok_op_properties (decl
, /*complain=*/true))
9030 else if (UDLIT_OPER_P (DECL_NAME (decl
)))
9032 bool long_long_unsigned_p
;
9034 const char *suffix
= NULL
;
9035 /* [over.literal]/6: Literal operators shall not have C linkage. */
9036 if (DECL_LANGUAGE (decl
) == lang_c
)
9038 error_at (location
, "literal operator with C linkage");
9039 maybe_show_extern_c_location ();
9043 if (DECL_NAMESPACE_SCOPE_P (decl
))
9045 if (!check_literal_operator_args (decl
, &long_long_unsigned_p
,
9048 error_at (location
, "%qD has invalid argument list", decl
);
9052 suffix
= UDLIT_OP_SUFFIX (DECL_NAME (decl
));
9053 if (long_long_unsigned_p
)
9055 if (cpp_interpret_int_suffix (parse_in
, suffix
, strlen (suffix
)))
9056 warning_at (location
, 0, "integer suffix %qs"
9057 " shadowed by implementation", suffix
);
9059 else if (long_double_p
)
9061 if (cpp_interpret_float_suffix (parse_in
, suffix
, strlen (suffix
)))
9062 warning_at (location
, 0, "floating point suffix %qs"
9063 " shadowed by implementation", suffix
);
9066 if (suffix
[0] != '_'
9067 && !in_system_header_at (location
)
9068 && !current_function_decl
&& !(friendp
&& !funcdef_flag
))
9069 warning_at (location
, OPT_Wliteral_suffix
,
9070 "literal operator suffixes not preceded by %<_%>"
9071 " are reserved for future standardization");
9075 error_at (location
, "%qD must be a non-member function", decl
);
9081 /* Make the init_value nonzero so pushdecl knows this is not
9082 tentative. error_mark_node is replaced later with the BLOCK. */
9083 DECL_INITIAL (decl
) = error_mark_node
;
9085 if (TYPE_NOTHROW_P (type
) || nothrow_libfn_p (decl
))
9086 TREE_NOTHROW (decl
) = 1;
9088 if (flag_openmp
|| flag_openmp_simd
)
9090 /* Adjust "omp declare simd" attributes. */
9091 tree ods
= lookup_attribute ("omp declare simd", *attrlist
);
9095 for (attr
= ods
; attr
;
9096 attr
= lookup_attribute ("omp declare simd", TREE_CHAIN (attr
)))
9098 if (TREE_CODE (type
) == METHOD_TYPE
)
9099 walk_tree (&TREE_VALUE (attr
), declare_simd_adjust_this
,
9100 DECL_ARGUMENTS (decl
), NULL
);
9101 if (TREE_VALUE (attr
) != NULL_TREE
)
9103 tree cl
= TREE_VALUE (TREE_VALUE (attr
));
9104 cl
= c_omp_declare_simd_clauses_to_numbers
9105 (DECL_ARGUMENTS (decl
), cl
);
9107 TREE_VALUE (TREE_VALUE (attr
)) = cl
;
9109 TREE_VALUE (attr
) = NULL_TREE
;
9115 /* Caller will do the rest of this. */
9119 if (ctype
!= NULL_TREE
)
9120 grokclassfn (ctype
, decl
, flags
);
9123 if (cxx_dialect
>= cxx11
9124 && DECL_DESTRUCTOR_P (decl
)
9125 && !TYPE_BEING_DEFINED (DECL_CONTEXT (decl
))
9126 && !processing_template_decl
)
9127 deduce_noexcept_on_destructor (decl
);
9129 decl
= check_explicit_specialization (orig_declarator
, decl
,
9132 4 * (friendp
!= 0) +
9135 if (decl
== error_mark_node
)
9138 if (DECL_STATIC_FUNCTION_P (decl
))
9139 check_static_quals (decl
, quals
);
9143 cplus_decl_attributes (&decl
, *attrlist
, 0);
9144 *attrlist
= NULL_TREE
;
9147 /* Check main's type after attributes have been applied. */
9148 if (ctype
== NULL_TREE
&& DECL_MAIN_P (decl
))
9150 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl
)),
9153 tree oldtypeargs
= TYPE_ARG_TYPES (TREE_TYPE (decl
));
9155 error_at (declspecs
->locations
[ds_type_spec
],
9156 "%<::main%> must return %<int%>");
9157 newtype
= build_function_type (integer_type_node
, oldtypeargs
);
9158 TREE_TYPE (decl
) = newtype
;
9161 check_main_parameter_types (decl
);
9164 if (ctype
!= NULL_TREE
&& check
)
9166 tree old_decl
= check_classfn (ctype
, decl
,
9167 (processing_template_decl
9168 > template_class_depth (ctype
))
9169 ? current_template_parms
9172 if (old_decl
== error_mark_node
)
9180 if (TREE_CODE (old_decl
) == TEMPLATE_DECL
)
9181 /* Because grokfndecl is always supposed to return a
9182 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
9183 here. We depend on our callers to figure out that its
9184 really a template that's being returned. */
9185 old_decl
= DECL_TEMPLATE_RESULT (old_decl
);
9187 if (DECL_STATIC_FUNCTION_P (old_decl
)
9188 && TREE_CODE (TREE_TYPE (decl
)) == METHOD_TYPE
)
9190 /* Remove the `this' parm added by grokclassfn. */
9191 revert_static_member_fn (decl
);
9192 check_static_quals (decl
, quals
);
9194 if (DECL_ARTIFICIAL (old_decl
))
9196 error ("definition of implicitly-declared %qD", old_decl
);
9199 else if (DECL_DEFAULTED_FN (old_decl
))
9201 error ("definition of explicitly-defaulted %q+D", decl
);
9202 inform (DECL_SOURCE_LOCATION (old_decl
),
9203 "%q#D explicitly defaulted here", old_decl
);
9207 /* Since we've smashed OLD_DECL to its
9208 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
9209 if (TREE_CODE (decl
) == TEMPLATE_DECL
)
9210 decl
= DECL_TEMPLATE_RESULT (decl
);
9212 /* Attempt to merge the declarations. This can fail, in
9213 the case of some invalid specialization declarations. */
9214 pushed_scope
= push_scope (ctype
);
9215 ok
= duplicate_decls (decl
, old_decl
, friendp
);
9217 pop_scope (pushed_scope
);
9220 error ("no %q#D member function declared in class %qT",
9224 if (ok
== error_mark_node
)
9230 if (DECL_CONSTRUCTOR_P (decl
) && !grok_ctor_properties (ctype
, decl
))
9233 if (ctype
== NULL_TREE
|| check
)
9237 DECL_VIRTUAL_P (decl
) = 1;
9242 /* decl is a FUNCTION_DECL.
9243 specifiers are the parsed virt-specifiers.
9245 Set flags to reflect the virt-specifiers.
9250 set_virt_specifiers (tree decl
, cp_virt_specifiers specifiers
)
9252 if (decl
== NULL_TREE
)
9254 if (specifiers
& VIRT_SPEC_OVERRIDE
)
9255 DECL_OVERRIDE_P (decl
) = 1;
9256 if (specifiers
& VIRT_SPEC_FINAL
)
9257 DECL_FINAL_P (decl
) = 1;
9261 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
9262 the linkage that DECL will receive in the object file. */
9265 set_linkage_for_static_data_member (tree decl
)
9267 /* A static data member always has static storage duration and
9268 external linkage. Note that static data members are forbidden in
9269 local classes -- the only situation in which a class has
9270 non-external linkage. */
9271 TREE_PUBLIC (decl
) = 1;
9272 TREE_STATIC (decl
) = 1;
9273 /* For non-template classes, static data members are always put
9274 out in exactly those files where they are defined, just as
9275 with ordinary namespace-scope variables. */
9276 if (!processing_template_decl
)
9277 DECL_INTERFACE_KNOWN (decl
) = 1;
9280 /* Create a VAR_DECL named NAME with the indicated TYPE.
9282 If SCOPE is non-NULL, it is the class type or namespace containing
9283 the variable. If SCOPE is NULL, the variable should is created in
9284 the innermost enclosing scope. */
9287 grokvardecl (tree type
,
9289 tree orig_declarator
,
9290 const cp_decl_specifier_seq
*declspecs
,
9297 location_t location
)
9300 tree explicit_scope
;
9302 gcc_assert (!name
|| identifier_p (name
));
9304 bool constp
= (type_quals
& TYPE_QUAL_CONST
) != 0;
9305 bool volatilep
= (type_quals
& TYPE_QUAL_VOLATILE
) != 0;
9307 /* Compute the scope in which to place the variable, but remember
9308 whether or not that scope was explicitly specified by the user. */
9309 explicit_scope
= scope
;
9312 /* An explicit "extern" specifier indicates a namespace-scope
9314 if (declspecs
->storage_class
== sc_extern
)
9315 scope
= current_decl_namespace ();
9316 else if (!at_function_scope_p ())
9317 scope
= current_scope ();
9321 && (/* If the variable is a namespace-scope variable declared in a
9322 template, we need DECL_LANG_SPECIFIC. */
9323 (TREE_CODE (scope
) == NAMESPACE_DECL
&& processing_template_decl
)
9324 /* Similarly for namespace-scope variables with language linkage
9326 || (TREE_CODE (scope
) == NAMESPACE_DECL
9327 && current_lang_name
!= lang_name_cplusplus
)
9328 /* Similarly for static data members. */
9330 /* Similarly for explicit specializations. */
9332 && TREE_CODE (orig_declarator
) == TEMPLATE_ID_EXPR
)))
9333 decl
= build_lang_decl_loc (location
, VAR_DECL
, name
, type
);
9335 decl
= build_decl (location
, VAR_DECL
, name
, type
);
9337 if (explicit_scope
&& TREE_CODE (explicit_scope
) == NAMESPACE_DECL
)
9338 set_decl_namespace (decl
, explicit_scope
, 0);
9340 DECL_CONTEXT (decl
) = FROB_CONTEXT (scope
);
9342 if (declspecs
->storage_class
== sc_extern
)
9344 DECL_THIS_EXTERN (decl
) = 1;
9345 DECL_EXTERNAL (decl
) = !initialized
;
9348 if (DECL_CLASS_SCOPE_P (decl
))
9350 set_linkage_for_static_data_member (decl
);
9351 /* This function is only called with out-of-class definitions. */
9352 DECL_EXTERNAL (decl
) = 0;
9353 check_class_member_definition_namespace (decl
);
9355 /* At top level, either `static' or no s.c. makes a definition
9356 (perhaps tentative), and absence of `static' makes it public. */
9357 else if (toplevel_bindings_p ())
9359 TREE_PUBLIC (decl
) = (declspecs
->storage_class
!= sc_static
9360 && (DECL_THIS_EXTERN (decl
)
9364 TREE_STATIC (decl
) = ! DECL_EXTERNAL (decl
);
9366 /* Not at top level, only `static' makes a static definition. */
9369 TREE_STATIC (decl
) = declspecs
->storage_class
== sc_static
;
9370 TREE_PUBLIC (decl
) = DECL_EXTERNAL (decl
);
9373 if (decl_spec_seq_has_spec_p (declspecs
, ds_thread
))
9375 if (DECL_EXTERNAL (decl
) || TREE_STATIC (decl
))
9377 CP_DECL_THREAD_LOCAL_P (decl
) = true;
9378 if (!processing_template_decl
)
9379 set_decl_tls_model (decl
, decl_default_tls_model (decl
));
9381 if (declspecs
->gnu_thread_keyword_p
)
9382 SET_DECL_GNU_TLS_P (decl
);
9385 /* If the type of the decl has no linkage, make sure that we'll
9386 notice that in mark_used. */
9387 if (cxx_dialect
> cxx98
9388 && decl_linkage (decl
) != lk_none
9389 && DECL_LANG_SPECIFIC (decl
) == NULL
9390 && !DECL_EXTERN_C_P (decl
)
9391 && no_linkage_check (TREE_TYPE (decl
), /*relaxed_p=*/false))
9392 retrofit_lang_decl (decl
);
9394 if (TREE_PUBLIC (decl
))
9396 /* [basic.link]: A name with no linkage (notably, the name of a class
9397 or enumeration declared in a local scope) shall not be used to
9398 declare an entity with linkage.
9400 DR 757 relaxes this restriction for C++0x. */
9401 if (cxx_dialect
< cxx11
)
9402 no_linkage_error (decl
);
9405 DECL_INTERFACE_KNOWN (decl
) = 1;
9407 if (DECL_NAME (decl
)
9408 && MAIN_NAME_P (DECL_NAME (decl
))
9409 && scope
== global_namespace
)
9410 error ("cannot declare %<::main%> to be a global variable");
9412 /* Check that the variable can be safely declared as a concept.
9413 Note that this also forbids explicit specializations. */
9416 if (!processing_template_decl
)
9418 error_at (declspecs
->locations
[ds_concept
],
9419 "a non-template variable cannot be %<concept%>");
9423 DECL_DECLARED_CONCEPT_P (decl
) = true;
9424 if (!same_type_ignoring_top_level_qualifiers_p (type
, boolean_type_node
))
9425 error_at (declspecs
->locations
[ds_type_spec
],
9426 "concept must have type %<bool%>");
9428 else if (flag_concepts
9429 && processing_template_decl
> template_class_depth (scope
))
9431 tree reqs
= TEMPLATE_PARMS_CONSTRAINTS (current_template_parms
);
9432 tree ci
= build_constraints (reqs
, NULL_TREE
);
9433 set_constraints (decl
, ci
);
9436 // Handle explicit specializations and instantiations of variable templates.
9437 if (orig_declarator
)
9438 decl
= check_explicit_specialization (orig_declarator
, decl
,
9439 template_count
, conceptp
* 8);
9441 return decl
!= error_mark_node
? decl
: NULL_TREE
;
9444 /* Create and return a canonical pointer to member function type, for
9445 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
9448 build_ptrmemfunc_type (tree type
)
9453 if (type
== error_mark_node
)
9456 /* Make sure that we always have the unqualified pointer-to-member
9458 if (cp_cv_quals quals
= cp_type_quals (type
))
9460 tree unqual
= build_ptrmemfunc_type (TYPE_MAIN_VARIANT (type
));
9461 return cp_build_qualified_type (unqual
, quals
);
9464 /* If a canonical type already exists for this type, use it. We use
9465 this method instead of type_hash_canon, because it only does a
9466 simple equality check on the list of field members. */
9468 t
= TYPE_PTRMEMFUNC_TYPE (type
);
9472 t
= make_node (RECORD_TYPE
);
9474 /* Let the front end know this is a pointer to member function. */
9475 TYPE_PTRMEMFUNC_FLAG (t
) = 1;
9477 field
= build_decl (input_location
, FIELD_DECL
, pfn_identifier
, type
);
9480 field
= build_decl (input_location
, FIELD_DECL
, delta_identifier
,
9482 DECL_CHAIN (field
) = fields
;
9485 finish_builtin_struct (t
, "__ptrmemfunc_type", fields
, ptr_type_node
);
9487 /* Zap out the name so that the back end will give us the debugging
9488 information for this anonymous RECORD_TYPE. */
9489 TYPE_NAME (t
) = NULL_TREE
;
9491 /* Cache this pointer-to-member type so that we can find it again
9493 TYPE_PTRMEMFUNC_TYPE (type
) = t
;
9495 if (TYPE_STRUCTURAL_EQUALITY_P (type
))
9496 SET_TYPE_STRUCTURAL_EQUALITY (t
);
9497 else if (TYPE_CANONICAL (type
) != type
)
9498 TYPE_CANONICAL (t
) = build_ptrmemfunc_type (TYPE_CANONICAL (type
));
9503 /* Create and return a pointer to data member type. */
9506 build_ptrmem_type (tree class_type
, tree member_type
)
9508 if (TREE_CODE (member_type
) == METHOD_TYPE
)
9510 cp_cv_quals quals
= type_memfn_quals (member_type
);
9511 cp_ref_qualifier rqual
= type_memfn_rqual (member_type
);
9512 member_type
= build_memfn_type (member_type
, class_type
, quals
, rqual
);
9513 return build_ptrmemfunc_type (build_pointer_type (member_type
));
9517 gcc_assert (TREE_CODE (member_type
) != FUNCTION_TYPE
);
9518 return build_offset_type (class_type
, member_type
);
9522 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
9523 Check to see that the definition is valid. Issue appropriate error
9527 check_static_variable_definition (tree decl
, tree type
)
9529 /* Avoid redundant diagnostics on out-of-class definitions. */
9530 if (!current_class_type
|| !TYPE_BEING_DEFINED (current_class_type
))
9532 /* Can't check yet if we don't know the type. */
9533 else if (dependent_type_p (type
))
9535 /* If DECL is declared constexpr, we'll do the appropriate checks
9536 in check_initializer. Similarly for inline static data members. */
9537 else if (DECL_P (decl
)
9538 && (DECL_DECLARED_CONSTEXPR_P (decl
)
9539 || undeduced_auto_decl (decl
)
9540 || DECL_VAR_DECLARED_INLINE_P (decl
)))
9542 else if (cxx_dialect
>= cxx11
&& !INTEGRAL_OR_ENUMERATION_TYPE_P (type
))
9544 if (!COMPLETE_TYPE_P (type
))
9545 error_at (DECL_SOURCE_LOCATION (decl
),
9546 "in-class initialization of static data member %q#D of "
9547 "incomplete type", decl
);
9548 else if (literal_type_p (type
))
9549 permerror (DECL_SOURCE_LOCATION (decl
),
9550 "%<constexpr%> needed for in-class initialization of "
9551 "static data member %q#D of non-integral type", decl
);
9553 error_at (DECL_SOURCE_LOCATION (decl
),
9554 "in-class initialization of static data member %q#D of "
9555 "non-literal type", decl
);
9557 /* Motion 10 at San Diego: If a static const integral data member is
9558 initialized with an integral constant expression, the initializer
9559 may appear either in the declaration (within the class), or in
9560 the definition, but not both. If it appears in the class, the
9561 member is a member constant. The file-scope definition is always
9563 else if (!ARITHMETIC_TYPE_P (type
) && TREE_CODE (type
) != ENUMERAL_TYPE
)
9564 error_at (DECL_SOURCE_LOCATION (decl
),
9565 "invalid in-class initialization of static data member "
9566 "of non-integral type %qT",
9568 else if (!CP_TYPE_CONST_P (type
))
9569 error_at (DECL_SOURCE_LOCATION (decl
),
9570 "ISO C++ forbids in-class initialization of non-const "
9571 "static member %qD",
9573 else if (!INTEGRAL_OR_ENUMERATION_TYPE_P (type
))
9574 pedwarn (DECL_SOURCE_LOCATION (decl
), OPT_Wpedantic
,
9575 "ISO C++ forbids initialization of member constant "
9576 "%qD of non-integral type %qT", decl
, type
);
9579 /* *expr_p is part of the TYPE_SIZE of a variably-sized array. If any
9580 SAVE_EXPRs in *expr_p wrap expressions with side-effects, break those
9581 expressions out into temporary variables so that walk_tree doesn't
9582 step into them (c++/15764). */
9585 stabilize_save_expr_r (tree
*expr_p
, int *walk_subtrees
, void *data
)
9587 hash_set
<tree
> *pset
= (hash_set
<tree
> *)data
;
9588 tree expr
= *expr_p
;
9589 if (TREE_CODE (expr
) == SAVE_EXPR
)
9591 tree op
= TREE_OPERAND (expr
, 0);
9592 cp_walk_tree (&op
, stabilize_save_expr_r
, data
, pset
);
9593 if (TREE_SIDE_EFFECTS (op
))
9594 TREE_OPERAND (expr
, 0) = get_temp_regvar (TREE_TYPE (op
), op
);
9597 else if (!EXPR_P (expr
) || !TREE_SIDE_EFFECTS (expr
))
9602 /* Entry point for the above. */
9605 stabilize_vla_size (tree size
)
9607 hash_set
<tree
> pset
;
9608 /* Break out any function calls into temporary variables. */
9609 cp_walk_tree (&size
, stabilize_save_expr_r
, &pset
, &pset
);
9612 /* Reduce a SIZEOF_EXPR to its value. */
9615 fold_sizeof_expr (tree t
)
9618 if (SIZEOF_EXPR_TYPE_P (t
))
9619 r
= cxx_sizeof_or_alignof_type (TREE_TYPE (TREE_OPERAND (t
, 0)),
9620 SIZEOF_EXPR
, false, false);
9621 else if (TYPE_P (TREE_OPERAND (t
, 0)))
9622 r
= cxx_sizeof_or_alignof_type (TREE_OPERAND (t
, 0), SIZEOF_EXPR
,
9625 r
= cxx_sizeof_or_alignof_expr (TREE_OPERAND (t
, 0), SIZEOF_EXPR
,
9627 if (r
== error_mark_node
)
9632 /* Given the SIZE (i.e., number of elements) in an array, compute
9633 an appropriate index type for the array. If non-NULL, NAME is
9634 the name of the entity being declared. */
9637 compute_array_index_type_loc (location_t name_loc
, tree name
, tree size
,
9638 tsubst_flags_t complain
)
9643 if (error_operand_p (size
))
9644 return error_mark_node
;
9646 location_t loc
= cp_expr_loc_or_loc (size
, name
? name_loc
: input_location
);
9648 if (!type_dependent_expression_p (size
))
9650 osize
= size
= mark_rvalue_use (size
);
9652 if (cxx_dialect
< cxx11
&& TREE_CODE (size
) == NOP_EXPR
9653 && TREE_SIDE_EFFECTS (size
))
9654 /* In C++98, we mark a non-constant array bound with a magic
9655 NOP_EXPR with TREE_SIDE_EFFECTS; don't fold in that case. */;
9658 size
= instantiate_non_dependent_expr_sfinae (size
, complain
);
9659 size
= build_converted_constant_expr (size_type_node
, size
, complain
);
9660 /* Pedantically a constant expression is required here and so
9661 __builtin_is_constant_evaluated () should fold to true if it
9662 is successfully folded into a constant. */
9663 size
= maybe_constant_value (size
, NULL_TREE
,
9664 /*manifestly_const_eval=*/true);
9666 if (!TREE_CONSTANT (size
))
9670 if (error_operand_p (size
))
9671 return error_mark_node
;
9673 /* The array bound must be an integer type. */
9674 tree type
= TREE_TYPE (size
);
9675 if (!INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type
))
9677 if (!(complain
& tf_error
))
9678 return error_mark_node
;
9680 error_at (loc
, "size of array %qD has non-integral type %qT",
9683 error_at (loc
, "size of array has non-integral type %qT", type
);
9684 size
= integer_one_node
;
9688 /* A type is dependent if it is...an array type constructed from any
9689 dependent type or whose size is specified by a constant expression
9690 that is value-dependent. */
9691 /* We can only call value_dependent_expression_p on integral constant
9692 expressions; treat non-constant expressions as dependent, too. */
9693 if (processing_template_decl
9694 && (type_dependent_expression_p (size
)
9695 || !TREE_CONSTANT (size
) || value_dependent_expression_p (size
)))
9697 /* We cannot do any checking for a SIZE that isn't known to be
9698 constant. Just build the index type and mark that it requires
9699 structural equality checks. */
9700 itype
= build_index_type (build_min (MINUS_EXPR
, sizetype
,
9701 size
, size_one_node
));
9702 TYPE_DEPENDENT_P (itype
) = 1;
9703 TYPE_DEPENDENT_P_VALID (itype
) = 1;
9704 SET_TYPE_STRUCTURAL_EQUALITY (itype
);
9708 if (TREE_CODE (size
) != INTEGER_CST
)
9710 tree folded
= cp_fully_fold (size
);
9711 if (TREE_CODE (folded
) == INTEGER_CST
)
9714 pedwarn (loc
, OPT_Wpedantic
, "size of array %qD is not an "
9715 "integral constant-expression", name
);
9717 pedwarn (loc
, OPT_Wpedantic
,
9718 "size of array is not an integral constant-expression");
9720 /* Use the folded result for VLAs, too; it will have resolved
9725 /* Normally, the array-bound will be a constant. */
9726 if (TREE_CODE (size
) == INTEGER_CST
)
9728 /* An array must have a positive number of elements. */
9729 if (!valid_constant_size_p (size
))
9731 if (!(complain
& tf_error
))
9732 return error_mark_node
;
9735 error_at (loc
, "size of array %qD is negative", name
);
9737 error_at (loc
, "size of array is negative");
9738 size
= integer_one_node
;
9740 /* As an extension we allow zero-sized arrays. */
9741 else if (integer_zerop (size
))
9743 if (!(complain
& tf_error
))
9744 /* We must fail if performing argument deduction (as
9745 indicated by the state of complain), so that
9746 another substitution can be found. */
9747 return error_mark_node
;
9748 else if (in_system_header_at (input_location
))
9749 /* Allow them in system headers because glibc uses them. */;
9751 pedwarn (loc
, OPT_Wpedantic
,
9752 "ISO C++ forbids zero-size array %qD", name
);
9754 pedwarn (loc
, OPT_Wpedantic
,
9755 "ISO C++ forbids zero-size array");
9758 else if (TREE_CONSTANT (size
)
9759 /* We don't allow VLAs at non-function scopes, or during
9760 tentative template substitution. */
9761 || !at_function_scope_p ()
9762 || !(complain
& tf_error
))
9764 if (!(complain
& tf_error
))
9765 return error_mark_node
;
9766 /* `(int) &fn' is not a valid array bound. */
9769 "size of array %qD is not an integral constant-expression",
9772 error_at (loc
, "size of array is not an integral constant-expression");
9773 size
= integer_one_node
;
9775 else if (pedantic
&& warn_vla
!= 0)
9778 pedwarn (name_loc
, OPT_Wvla
,
9779 "ISO C++ forbids variable length array %qD", name
);
9781 pedwarn (input_location
, OPT_Wvla
,
9782 "ISO C++ forbids variable length array");
9784 else if (warn_vla
> 0)
9787 warning_at (name_loc
, OPT_Wvla
,
9788 "variable length array %qD is used", name
);
9791 "variable length array is used");
9794 if (processing_template_decl
&& !TREE_CONSTANT (size
))
9795 /* A variable sized array. */
9796 itype
= build_min (MINUS_EXPR
, sizetype
, size
, integer_one_node
);
9799 /* Compute the index of the largest element in the array. It is
9800 one less than the number of elements in the array. We save
9801 and restore PROCESSING_TEMPLATE_DECL so that computations in
9802 cp_build_binary_op will be appropriately folded. */
9804 processing_template_decl_sentinel s
;
9805 itype
= cp_build_binary_op (input_location
,
9807 cp_convert (ssizetype
, size
, complain
),
9808 cp_convert (ssizetype
, integer_one_node
,
9811 itype
= maybe_constant_value (itype
);
9814 if (!TREE_CONSTANT (itype
))
9816 /* A variable sized array. */
9817 itype
= variable_size (itype
);
9819 stabilize_vla_size (itype
);
9821 if (sanitize_flags_p (SANITIZE_VLA
)
9822 && current_function_decl
!= NULL_TREE
)
9824 /* We have to add 1 -- in the ubsan routine we generate
9825 LE_EXPR rather than LT_EXPR. */
9826 tree t
= fold_build2 (PLUS_EXPR
, TREE_TYPE (itype
), itype
,
9827 build_one_cst (TREE_TYPE (itype
)));
9828 t
= ubsan_instrument_vla (input_location
, t
);
9829 finish_expr_stmt (t
);
9832 /* Make sure that there was no overflow when creating to a signed
9833 index type. (For example, on a 32-bit machine, an array with
9834 size 2^32 - 1 is too big.) */
9835 else if (TREE_CODE (itype
) == INTEGER_CST
9836 && TREE_OVERFLOW (itype
))
9838 if (!(complain
& tf_error
))
9839 return error_mark_node
;
9840 error ("overflow in array dimension");
9841 TREE_OVERFLOW (itype
) = 0;
9845 /* Create and return the appropriate index type. */
9846 itype
= build_index_type (itype
);
9848 /* If the index type were dependent, we would have returned early, so
9849 remember that it isn't. */
9850 TYPE_DEPENDENT_P (itype
) = 0;
9851 TYPE_DEPENDENT_P_VALID (itype
) = 1;
9856 compute_array_index_type (tree name
, tree size
, tsubst_flags_t complain
)
9858 return compute_array_index_type_loc (input_location
, name
, size
, complain
);
9861 /* Returns the scope (if any) in which the entity declared by
9862 DECLARATOR will be located. If the entity was declared with an
9863 unqualified name, NULL_TREE is returned. */
9866 get_scope_of_declarator (const cp_declarator
*declarator
)
9868 while (declarator
&& declarator
->kind
!= cdk_id
)
9869 declarator
= declarator
->declarator
;
9871 /* If the declarator-id is a SCOPE_REF, the scope in which the
9872 declaration occurs is the first operand. */
9874 && declarator
->u
.id
.qualifying_scope
)
9875 return declarator
->u
.id
.qualifying_scope
;
9877 /* Otherwise, the declarator is not a qualified name; the entity will
9878 be declared in the current scope. */
9882 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
9883 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
9887 create_array_type_for_decl (tree name
, tree type
, tree size
, location_t loc
)
9889 tree itype
= NULL_TREE
;
9891 /* If things have already gone awry, bail now. */
9892 if (type
== error_mark_node
|| size
== error_mark_node
)
9893 return error_mark_node
;
9895 /* 8.3.4/1: If the type of the identifier of D contains the auto
9896 type-specifier, the program is ill-formed. */
9897 if (type_uses_auto (type
))
9900 error_at (loc
, "%qD declared as array of %qT", name
, type
);
9902 error ("creating array of %qT", type
);
9903 return error_mark_node
;
9906 /* If there are some types which cannot be array elements,
9907 issue an error-message and return. */
9908 switch (TREE_CODE (type
))
9912 error_at (loc
, "declaration of %qD as array of void", name
);
9914 error ("creating array of void");
9915 return error_mark_node
;
9919 error_at (loc
, "declaration of %qD as array of functions", name
);
9921 error ("creating array of functions");
9922 return error_mark_node
;
9924 case REFERENCE_TYPE
:
9926 error_at (loc
, "declaration of %qD as array of references", name
);
9928 error ("creating array of references");
9929 return error_mark_node
;
9933 error_at (loc
, "declaration of %qD as array of function members",
9936 error ("creating array of function members");
9937 return error_mark_node
;
9945 The constant expressions that specify the bounds of the arrays
9946 can be omitted only for the first member of the sequence. */
9947 if (TREE_CODE (type
) == ARRAY_TYPE
&& !TYPE_DOMAIN (type
))
9950 error_at (loc
, "declaration of %qD as multidimensional array must "
9951 "have bounds for all dimensions except the first",
9954 error ("multidimensional array must have bounds for all "
9955 "dimensions except the first");
9957 return error_mark_node
;
9960 /* Figure out the index type for the array. */
9962 itype
= compute_array_index_type_loc (loc
, name
, size
,
9963 tf_warning_or_error
);
9966 T is called the array element type; this type shall not be [...] an
9967 abstract class type. */
9968 abstract_virtuals_error (name
, type
);
9970 return build_cplus_array_type (type
, itype
);
9973 /* Returns the smallest location that is not UNKNOWN_LOCATION. */
9976 min_location (location_t loca
, location_t locb
)
9978 if (loca
== UNKNOWN_LOCATION
9979 || (locb
!= UNKNOWN_LOCATION
9980 && linemap_location_before_p (line_table
, locb
, loca
)))
9985 /* Returns the smallest location != UNKNOWN_LOCATION among the
9986 three stored in LOCATIONS[ds_const], LOCATIONS[ds_volatile],
9987 and LOCATIONS[ds_restrict]. */
9990 smallest_type_quals_location (int type_quals
, const location_t
* locations
)
9992 location_t loc
= UNKNOWN_LOCATION
;
9994 if (type_quals
& TYPE_QUAL_CONST
)
9995 loc
= locations
[ds_const
];
9997 if (type_quals
& TYPE_QUAL_VOLATILE
)
9998 loc
= min_location (loc
, locations
[ds_volatile
]);
10000 if (type_quals
& TYPE_QUAL_RESTRICT
)
10001 loc
= min_location (loc
, locations
[ds_restrict
]);
10006 /* Check that it's OK to declare a function with the indicated TYPE
10007 and TYPE_QUALS. SFK indicates the kind of special function (if any)
10008 that this function is. OPTYPE is the type given in a conversion
10009 operator declaration, or the class type for a constructor/destructor.
10010 Returns the actual return type of the function; that may be different
10011 than TYPE if an error occurs, or for certain special functions. */
10014 check_special_function_return_type (special_function_kind sfk
,
10018 const location_t
* locations
)
10022 case sfk_constructor
:
10024 error ("return type specification for constructor invalid");
10025 else if (type_quals
!= TYPE_UNQUALIFIED
)
10026 error_at (smallest_type_quals_location (type_quals
, locations
),
10027 "qualifiers are not allowed on constructor declaration");
10029 if (targetm
.cxx
.cdtor_returns_this ())
10030 type
= build_pointer_type (optype
);
10032 type
= void_type_node
;
10035 case sfk_destructor
:
10037 error ("return type specification for destructor invalid");
10038 else if (type_quals
!= TYPE_UNQUALIFIED
)
10039 error_at (smallest_type_quals_location (type_quals
, locations
),
10040 "qualifiers are not allowed on destructor declaration");
10042 /* We can't use the proper return type here because we run into
10043 problems with ambiguous bases and covariant returns. */
10044 if (targetm
.cxx
.cdtor_returns_this ())
10045 type
= build_pointer_type (void_type_node
);
10047 type
= void_type_node
;
10050 case sfk_conversion
:
10052 error ("return type specified for %<operator %T%>", optype
);
10053 else if (type_quals
!= TYPE_UNQUALIFIED
)
10054 error_at (smallest_type_quals_location (type_quals
, locations
),
10055 "qualifiers are not allowed on declaration of "
10056 "%<operator %T%>", optype
);
10061 case sfk_deduction_guide
:
10063 error ("return type specified for deduction guide");
10064 else if (type_quals
!= TYPE_UNQUALIFIED
)
10065 error_at (smallest_type_quals_location (type_quals
, locations
),
10066 "qualifiers are not allowed on declaration of "
10067 "deduction guide");
10068 if (TREE_CODE (optype
) == TEMPLATE_TEMPLATE_PARM
)
10070 error ("template template parameter %qT in declaration of "
10071 "deduction guide", optype
);
10072 type
= error_mark_node
;
10075 type
= make_template_placeholder (CLASSTYPE_TI_TEMPLATE (optype
));
10076 for (int i
= 0; i
< ds_last
; ++i
)
10077 if (i
!= ds_explicit
&& locations
[i
])
10078 error_at (locations
[i
],
10079 "decl-specifier in declaration of deduction guide");
10083 gcc_unreachable ();
10089 /* A variable or data member (whose unqualified name is IDENTIFIER)
10090 has been declared with the indicated TYPE. If the TYPE is not
10091 acceptable, issue an error message and return a type to use for
10092 error-recovery purposes. */
10095 check_var_type (tree identifier
, tree type
)
10097 if (VOID_TYPE_P (type
))
10100 error ("unnamed variable or field declared void");
10101 else if (identifier_p (identifier
))
10103 gcc_assert (!IDENTIFIER_ANY_OP_P (identifier
));
10104 error ("variable or field %qE declared void", identifier
);
10107 error ("variable or field declared void");
10108 type
= error_mark_node
;
10114 /* Handle declaring DECL as an inline variable. */
10117 mark_inline_variable (tree decl
, location_t loc
)
10119 bool inlinep
= true;
10120 if (! toplevel_bindings_p ())
10122 error_at (loc
, "%<inline%> specifier invalid for variable "
10123 "%qD declared at block scope", decl
);
10126 else if (cxx_dialect
< cxx17
)
10127 pedwarn (loc
, 0, "inline variables are only available "
10128 "with -std=c++17 or -std=gnu++17");
10131 retrofit_lang_decl (decl
);
10132 SET_DECL_VAR_DECLARED_INLINE_P (decl
);
10137 /* Assign a typedef-given name to a class or enumeration type declared
10138 as anonymous at first. This was split out of grokdeclarator
10139 because it is also used in libcc1. */
10142 name_unnamed_type (tree type
, tree decl
)
10144 gcc_assert (TYPE_UNNAMED_P (type
));
10146 /* Replace the anonymous name with the real name everywhere. */
10147 for (tree t
= TYPE_MAIN_VARIANT (type
); t
; t
= TYPE_NEXT_VARIANT (t
))
10149 if (anon_aggrname_p (TYPE_IDENTIFIER (t
)))
10150 /* We do not rename the debug info representing the
10151 unnamed tagged type because the standard says in
10152 [dcl.typedef] that the naming applies only for
10153 linkage purposes. */
10154 /*debug_hooks->set_name (t, decl);*/
10155 TYPE_NAME (t
) = decl
;
10158 if (TYPE_LANG_SPECIFIC (type
))
10159 TYPE_WAS_UNNAMED (type
) = 1;
10161 /* If this is a typedef within a template class, the nested
10162 type is a (non-primary) template. The name for the
10163 template needs updating as well. */
10164 if (TYPE_LANG_SPECIFIC (type
) && CLASSTYPE_TEMPLATE_INFO (type
))
10165 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type
))
10166 = TYPE_IDENTIFIER (type
);
10168 /* Adjust linkage now that we aren't unnamed anymore. */
10169 reset_type_linkage (type
);
10171 /* FIXME remangle member functions; member functions of a
10172 type with external linkage have external linkage. */
10174 /* Check that our job is done, and that it would fail if we
10175 attempted to do it again. */
10176 gcc_assert (!TYPE_UNNAMED_P (type
));
10179 /* Given declspecs and a declarator (abstract or otherwise), determine
10180 the name and type of the object declared and construct a DECL node
10183 DECLSPECS points to the representation of declaration-specifier
10184 sequence that precedes declarator.
10186 DECL_CONTEXT says which syntactic context this declaration is in:
10187 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
10188 FUNCDEF for a function definition. Like NORMAL but a few different
10189 error messages in each case. Return value may be zero meaning
10190 this definition is too screwy to try to parse.
10191 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
10192 handle member functions (which have FIELD context).
10193 Return value may be zero meaning this definition is too screwy to
10195 PARM for a parameter declaration (either within a function prototype
10196 or before a function body). Make a PARM_DECL, or return void_type_node.
10197 TPARM for a template parameter declaration.
10198 CATCHPARM for a parameter declaration before a catch clause.
10199 TYPENAME if for a typename (in a cast or sizeof).
10200 Don't make a DECL node; just return the ..._TYPE node.
10201 FIELD for a struct or union field; make a FIELD_DECL.
10202 BITFIELD for a field with specified width.
10204 INITIALIZED is as for start_decl.
10206 ATTRLIST is a pointer to the list of attributes, which may be NULL
10207 if there are none; *ATTRLIST may be modified if attributes from inside
10208 the declarator should be applied to the declaration.
10210 When this function is called, scoping variables (such as
10211 CURRENT_CLASS_TYPE) should reflect the scope in which the
10212 declaration occurs, not the scope in which the new declaration will
10213 be placed. For example, on:
10215 void S::f() { ... }
10217 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
10220 Returns a DECL (if a declarator is present), a TYPE (if there is no
10221 declarator, in cases like "struct S;"), or the ERROR_MARK_NODE if an
10225 grokdeclarator (const cp_declarator
*declarator
,
10226 cp_decl_specifier_seq
*declspecs
,
10227 enum decl_context decl_context
,
10231 tree type
= NULL_TREE
;
10233 int explicit_intN
= 0;
10234 int virtualp
, explicitp
, friendp
, inlinep
, staticp
;
10235 int explicit_int
= 0;
10236 int explicit_char
= 0;
10237 int defaulted_int
= 0;
10239 tree typedef_decl
= NULL_TREE
;
10240 const char *name
= NULL
;
10241 tree typedef_type
= NULL_TREE
;
10242 /* True if this declarator is a function definition. */
10243 bool funcdef_flag
= false;
10244 cp_declarator_kind innermost_code
= cdk_error
;
10247 /* See the code below that used this. */
10248 tree decl_attr
= NULL_TREE
;
10251 /* Keep track of what sort of function is being processed
10252 so that we can warn about default return values, or explicit
10253 return values which do not match prescribed defaults. */
10254 special_function_kind sfk
= sfk_none
;
10256 tree dname
= NULL_TREE
;
10257 tree ctor_return_type
= NULL_TREE
;
10258 enum overload_flags flags
= NO_SPECIAL
;
10259 /* cv-qualifiers that apply to the declarator, for a declaration of
10260 a member function. */
10261 cp_cv_quals memfn_quals
= TYPE_UNQUALIFIED
;
10262 /* virt-specifiers that apply to the declarator, for a declaration of
10263 a member function. */
10264 cp_virt_specifiers virt_specifiers
= VIRT_SPEC_UNSPECIFIED
;
10265 /* ref-qualifier that applies to the declarator, for a declaration of
10266 a member function. */
10267 cp_ref_qualifier rqual
= REF_QUAL_NONE
;
10268 /* cv-qualifiers that apply to the type specified by the DECLSPECS. */
10269 int type_quals
= TYPE_UNQUALIFIED
;
10270 tree raises
= NULL_TREE
;
10271 int template_count
= 0;
10272 tree returned_attrs
= NULL_TREE
;
10273 tree parms
= NULL_TREE
;
10274 const cp_declarator
*id_declarator
;
10275 /* The unqualified name of the declarator; either an
10276 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
10277 tree unqualified_id
;
10278 /* The class type, if any, in which this entity is located,
10279 or NULL_TREE if none. Note that this value may be different from
10280 the current class type; for example if an attempt is made to declare
10281 "A::f" inside "B", this value will be "A". */
10282 tree ctype
= current_class_type
;
10283 /* The NAMESPACE_DECL for the namespace in which this entity is
10284 located. If an unqualified name is used to declare the entity,
10285 this value will be NULL_TREE, even if the entity is located at
10286 namespace scope. */
10287 tree in_namespace
= NULL_TREE
;
10288 cp_storage_class storage_class
;
10289 bool unsigned_p
, signed_p
, short_p
, long_p
, thread_p
;
10290 bool type_was_error_mark_node
= false;
10291 bool parameter_pack_p
= declarator
? declarator
->parameter_pack_p
: false;
10292 bool template_type_arg
= false;
10293 bool template_parm_flag
= false;
10294 bool typedef_p
= decl_spec_seq_has_spec_p (declspecs
, ds_typedef
);
10295 bool constexpr_p
= decl_spec_seq_has_spec_p (declspecs
, ds_constexpr
);
10296 bool late_return_type_p
= false;
10297 bool array_parameter_p
= false;
10298 location_t saved_loc
= input_location
;
10299 tree reqs
= NULL_TREE
;
10301 signed_p
= decl_spec_seq_has_spec_p (declspecs
, ds_signed
);
10302 unsigned_p
= decl_spec_seq_has_spec_p (declspecs
, ds_unsigned
);
10303 short_p
= decl_spec_seq_has_spec_p (declspecs
, ds_short
);
10304 long_p
= decl_spec_seq_has_spec_p (declspecs
, ds_long
);
10305 longlong
= decl_spec_seq_has_spec_p (declspecs
, ds_long_long
);
10306 explicit_intN
= declspecs
->explicit_intN_p
;
10307 thread_p
= decl_spec_seq_has_spec_p (declspecs
, ds_thread
);
10309 // Was concept_p specified? Note that ds_concept
10310 // implies ds_constexpr!
10311 bool concept_p
= decl_spec_seq_has_spec_p (declspecs
, ds_concept
);
10313 constexpr_p
= true;
10315 if (decl_spec_seq_has_spec_p (declspecs
, ds_const
))
10316 type_quals
|= TYPE_QUAL_CONST
;
10317 if (decl_spec_seq_has_spec_p (declspecs
, ds_volatile
))
10318 type_quals
|= TYPE_QUAL_VOLATILE
;
10319 if (decl_spec_seq_has_spec_p (declspecs
, ds_restrict
))
10320 type_quals
|= TYPE_QUAL_RESTRICT
;
10322 if (decl_context
== FUNCDEF
)
10323 funcdef_flag
= true, decl_context
= NORMAL
;
10324 else if (decl_context
== MEMFUNCDEF
)
10325 funcdef_flag
= true, decl_context
= FIELD
;
10326 else if (decl_context
== BITFIELD
)
10327 bitfield
= 1, decl_context
= FIELD
;
10328 else if (decl_context
== TEMPLATE_TYPE_ARG
)
10329 template_type_arg
= true, decl_context
= TYPENAME
;
10330 else if (decl_context
== TPARM
)
10331 template_parm_flag
= true, decl_context
= PARM
;
10333 if (initialized
> 1)
10334 funcdef_flag
= true;
10336 location_t typespec_loc
= smallest_type_quals_location (type_quals
,
10337 declspecs
->locations
);
10338 if (typespec_loc
== UNKNOWN_LOCATION
)
10339 typespec_loc
= declspecs
->locations
[ds_type_spec
];
10340 if (typespec_loc
== UNKNOWN_LOCATION
)
10341 typespec_loc
= input_location
;
10343 /* Look inside a declarator for the name being declared
10344 and get it as a string, for an error message. */
10345 for (id_declarator
= declarator
;
10347 id_declarator
= id_declarator
->declarator
)
10349 if (id_declarator
->kind
!= cdk_id
)
10350 innermost_code
= id_declarator
->kind
;
10352 switch (id_declarator
->kind
)
10355 if (id_declarator
->declarator
10356 && id_declarator
->declarator
->kind
== cdk_id
)
10358 sfk
= id_declarator
->declarator
->u
.id
.sfk
;
10359 if (sfk
== sfk_destructor
)
10366 tree qualifying_scope
= id_declarator
->u
.id
.qualifying_scope
;
10367 tree decl
= id_declarator
->u
.id
.unqualified_name
;
10370 if (qualifying_scope
)
10372 if (check_for_bare_parameter_packs (qualifying_scope
,
10373 id_declarator
->id_loc
))
10374 return error_mark_node
;
10375 if (at_function_scope_p ())
10379 A declarator-id shall not be qualified except
10382 None of the cases are permitted in block
10384 if (qualifying_scope
== global_namespace
)
10385 error ("invalid use of qualified-name %<::%D%>",
10387 else if (TYPE_P (qualifying_scope
))
10388 error ("invalid use of qualified-name %<%T::%D%>",
10389 qualifying_scope
, decl
);
10391 error ("invalid use of qualified-name %<%D::%D%>",
10392 qualifying_scope
, decl
);
10393 return error_mark_node
;
10395 else if (TYPE_P (qualifying_scope
))
10397 ctype
= qualifying_scope
;
10398 if (!MAYBE_CLASS_TYPE_P (ctype
))
10400 error ("%q#T is not a class or a namespace", ctype
);
10403 else if (innermost_code
!= cdk_function
10404 && current_class_type
10405 && !uniquely_derived_from_p (ctype
,
10406 current_class_type
))
10408 error ("invalid use of qualified-name %<%T::%D%>",
10409 qualifying_scope
, decl
);
10410 return error_mark_node
;
10413 else if (TREE_CODE (qualifying_scope
) == NAMESPACE_DECL
)
10414 in_namespace
= qualifying_scope
;
10416 switch (TREE_CODE (decl
))
10420 if (innermost_code
!= cdk_function
)
10422 error ("declaration of %qD as non-function", decl
);
10423 return error_mark_node
;
10425 else if (!qualifying_scope
10426 && !(current_class_type
&& at_class_scope_p ()))
10428 error ("declaration of %qD as non-member", decl
);
10429 return error_mark_node
;
10432 tree type
= TREE_OPERAND (decl
, 0);
10434 type
= constructor_name (type
);
10435 name
= identifier_to_locale (IDENTIFIER_POINTER (type
));
10440 case TEMPLATE_ID_EXPR
:
10442 tree fns
= TREE_OPERAND (decl
, 0);
10445 if (!identifier_p (dname
))
10446 dname
= OVL_NAME (dname
);
10448 /* Fall through. */
10450 case IDENTIFIER_NODE
:
10451 if (identifier_p (decl
))
10454 if (IDENTIFIER_KEYWORD_P (dname
))
10456 error ("declarator-id missing; using reserved word %qD",
10458 name
= identifier_to_locale (IDENTIFIER_POINTER (dname
));
10460 else if (!IDENTIFIER_CONV_OP_P (dname
))
10461 name
= identifier_to_locale (IDENTIFIER_POINTER (dname
));
10464 gcc_assert (flags
== NO_SPECIAL
);
10465 flags
= TYPENAME_FLAG
;
10466 sfk
= sfk_conversion
;
10467 tree glob
= get_global_binding (dname
);
10468 if (glob
&& TREE_CODE (glob
) == TYPE_DECL
)
10469 name
= identifier_to_locale (IDENTIFIER_POINTER (dname
));
10471 name
= "<invalid operator>";
10476 gcc_unreachable ();
10483 case cdk_reference
:
10488 name
= "structured binding";
10492 return error_mark_node
;
10495 gcc_unreachable ();
10497 if (id_declarator
->kind
== cdk_id
)
10503 The declarator in a function-definition shall have the form
10504 D1 ( parameter-declaration-clause) ... */
10505 if (funcdef_flag
&& innermost_code
!= cdk_function
)
10507 error ("function definition does not declare parameters");
10508 return error_mark_node
;
10511 if (flags
== TYPENAME_FLAG
10512 && innermost_code
!= cdk_function
10513 && ! (ctype
&& !declspecs
->any_specifiers_p
))
10515 error ("declaration of %qD as non-function", dname
);
10516 return error_mark_node
;
10519 if (dname
&& identifier_p (dname
))
10521 if (UDLIT_OPER_P (dname
)
10522 && innermost_code
!= cdk_function
)
10524 error ("declaration of %qD as non-function", dname
);
10525 return error_mark_node
;
10528 if (IDENTIFIER_ANY_OP_P (dname
))
10532 error ("declaration of %qD as %<typedef%>", dname
);
10533 return error_mark_node
;
10535 else if (decl_context
== PARM
|| decl_context
== CATCHPARM
)
10537 error ("declaration of %qD as parameter", dname
);
10538 return error_mark_node
;
10543 /* Anything declared one level down from the top level
10544 must be one of the parameters of a function
10545 (because the body is at least two levels down). */
10547 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
10548 by not allowing C++ class definitions to specify their parameters
10549 with xdecls (must be spec.d in the parmlist).
10551 Since we now wait to push a class scope until we are sure that
10552 we are in a legitimate method context, we must set oldcname
10553 explicitly (since current_class_name is not yet alive).
10555 We also want to avoid calling this a PARM if it is in a namespace. */
10557 if (decl_context
== NORMAL
&& !toplevel_bindings_p ())
10559 cp_binding_level
*b
= current_binding_level
;
10560 current_binding_level
= b
->level_chain
;
10561 if (current_binding_level
!= 0 && toplevel_bindings_p ())
10562 decl_context
= PARM
;
10563 current_binding_level
= b
;
10567 name
= decl_context
== PARM
? "parameter" : "type name";
10569 if (concept_p
&& typedef_p
)
10571 error_at (declspecs
->locations
[ds_concept
],
10572 "%<concept%> cannot appear in a typedef declaration");
10573 return error_mark_node
;
10576 if (constexpr_p
&& typedef_p
)
10578 error_at (declspecs
->locations
[ds_constexpr
],
10579 "%<constexpr%> cannot appear in a typedef declaration");
10580 return error_mark_node
;
10583 /* If there were multiple types specified in the decl-specifier-seq,
10584 issue an error message. */
10585 if (declspecs
->multiple_types_p
)
10587 error ("two or more data types in declaration of %qs", name
);
10588 return error_mark_node
;
10591 if (declspecs
->conflicting_specifiers_p
)
10593 error ("conflicting specifiers in declaration of %qs", name
);
10594 return error_mark_node
;
10597 /* Extract the basic type from the decl-specifier-seq. */
10598 type
= declspecs
->type
;
10599 if (type
== error_mark_node
)
10602 type_was_error_mark_node
= true;
10604 cp_warn_deprecated_use (type
);
10605 if (type
&& TREE_CODE (type
) == TYPE_DECL
)
10607 typedef_decl
= type
;
10608 type
= TREE_TYPE (typedef_decl
);
10609 if (DECL_ARTIFICIAL (typedef_decl
))
10610 cp_warn_deprecated_use (type
);
10612 /* No type at all: default to `int', and set DEFAULTED_INT
10613 because it was not a user-defined typedef. */
10614 if (type
== NULL_TREE
)
10616 if (signed_p
|| unsigned_p
|| long_p
|| short_p
)
10618 /* These imply 'int'. */
10619 type
= integer_type_node
;
10622 /* If we just have "complex", it is equivalent to "complex double". */
10623 else if (!longlong
&& !explicit_intN
10624 && decl_spec_seq_has_spec_p (declspecs
, ds_complex
))
10626 type
= double_type_node
;
10627 pedwarn (declspecs
->locations
[ds_complex
], OPT_Wpedantic
,
10628 "ISO C++ does not support plain %<complex%> meaning "
10629 "%<double complex%>");
10632 /* Gather flags. */
10633 explicit_int
= declspecs
->explicit_int_p
;
10634 explicit_char
= declspecs
->explicit_char_p
;
10637 /* See the code below that used this. */
10639 decl_attr
= DECL_ATTRIBUTES (typedef_decl
);
10641 typedef_type
= type
;
10643 if (sfk
== sfk_conversion
|| sfk
== sfk_deduction_guide
)
10644 ctor_return_type
= TREE_TYPE (dname
);
10646 ctor_return_type
= ctype
;
10648 if (sfk
!= sfk_none
)
10650 type
= check_special_function_return_type (sfk
, type
,
10653 declspecs
->locations
);
10654 type_quals
= TYPE_UNQUALIFIED
;
10656 else if (type
== NULL_TREE
)
10662 /* We handle `main' specially here, because 'main () { }' is so
10663 common. With no options, it is allowed. With -Wreturn-type,
10664 it is a warning. It is only an error with -pedantic-errors. */
10665 is_main
= (funcdef_flag
10666 && dname
&& identifier_p (dname
)
10667 && MAIN_NAME_P (dname
)
10668 && ctype
== NULL_TREE
10669 && in_namespace
== NULL_TREE
10670 && current_namespace
== global_namespace
);
10672 if (type_was_error_mark_node
)
10673 /* We've already issued an error, don't complain more. */;
10674 else if (in_system_header_at (input_location
) || flag_ms_extensions
)
10675 /* Allow it, sigh. */;
10676 else if (! is_main
)
10677 permerror (input_location
, "ISO C++ forbids declaration of %qs with no type", name
);
10679 pedwarn (input_location
, OPT_Wpedantic
,
10680 "ISO C++ forbids declaration of %qs with no type", name
);
10682 warning (OPT_Wreturn_type
,
10683 "ISO C++ forbids declaration of %qs with no type", name
);
10685 if (type_was_error_mark_node
&& template_parm_flag
)
10686 /* FIXME we should be able to propagate the error_mark_node as is
10687 for other contexts too. */
10688 type
= error_mark_node
;
10690 type
= integer_type_node
;
10697 if (! int_n_enabled_p
[declspecs
->int_n_idx
])
10699 error ("%<__int%d%> is not supported by this target",
10700 int_n_data
[declspecs
->int_n_idx
].bitsize
);
10701 explicit_intN
= false;
10703 else if (pedantic
&& ! in_system_header_at (input_location
))
10704 pedwarn (input_location
, OPT_Wpedantic
,
10705 "ISO C++ does not support %<__int%d%> for %qs",
10706 int_n_data
[declspecs
->int_n_idx
].bitsize
, name
);
10709 /* Now process the modifiers that were specified
10710 and check for invalid combinations. */
10712 /* Long double is a special combination. */
10713 if (long_p
&& !longlong
&& TYPE_MAIN_VARIANT (type
) == double_type_node
)
10716 type
= cp_build_qualified_type (long_double_type_node
,
10717 cp_type_quals (type
));
10720 /* Check all other uses of type modifiers. */
10722 if (unsigned_p
|| signed_p
|| long_p
|| short_p
)
10729 loc
= declspecs
->locations
[ds_unsigned
];
10734 loc
= declspecs
->locations
[ds_signed
];
10739 loc
= declspecs
->locations
[ds_long_long
];
10744 loc
= declspecs
->locations
[ds_long
];
10746 else /* if (short_p) */
10749 loc
= declspecs
->locations
[ds_short
];
10754 if (signed_p
&& unsigned_p
)
10756 gcc_rich_location
richloc (declspecs
->locations
[ds_signed
]);
10757 richloc
.add_range (declspecs
->locations
[ds_unsigned
]);
10758 error_at (&richloc
,
10759 "%<signed%> and %<unsigned%> specified together");
10761 else if (long_p
&& short_p
)
10763 gcc_rich_location
richloc (declspecs
->locations
[ds_long
]);
10764 richloc
.add_range (declspecs
->locations
[ds_short
]);
10765 error_at (&richloc
, "%<long%> and %<short%> specified together");
10767 else if (TREE_CODE (type
) != INTEGER_TYPE
10768 || type
== char16_type_node
|| type
== char32_type_node
10769 || ((long_p
|| short_p
)
10770 && (explicit_char
|| explicit_intN
)))
10771 error_at (loc
, "%qs specified with %qT", key
, type
);
10772 else if (!explicit_int
&& !defaulted_int
10773 && !explicit_char
&& !explicit_intN
)
10777 pedwarn (loc
, OPT_Wpedantic
, "%qs specified with %qT",
10779 ok
= !flag_pedantic_errors
;
10781 else if (declspecs
->decltype_p
)
10782 error_at (loc
, "%qs specified with %<decltype%>", key
);
10784 error_at (loc
, "%qs specified with %<typeof%>", key
);
10789 /* Discard the type modifiers if they are invalid. */
10792 unsigned_p
= false;
10800 /* Decide whether an integer type is signed or not.
10801 Optionally treat bitfields as signed by default. */
10805 It is implementation-defined whether a plain (neither
10806 explicitly signed or unsigned) char, short, int, or long
10807 bit-field is signed or unsigned.
10809 Naturally, we extend this to long long as well. Note that
10810 this does not include wchar_t. */
10811 || (bitfield
&& !flag_signed_bitfields
10813 /* A typedef for plain `int' without `signed' can be
10814 controlled just like plain `int', but a typedef for
10815 `signed int' cannot be so controlled. */
10817 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl
))
10818 && TREE_CODE (type
) == INTEGER_TYPE
10819 && !same_type_p (TYPE_MAIN_VARIANT (type
), wchar_type_node
)))
10822 type
= int_n_trees
[declspecs
->int_n_idx
].unsigned_type
;
10824 type
= long_long_unsigned_type_node
;
10826 type
= long_unsigned_type_node
;
10828 type
= short_unsigned_type_node
;
10829 else if (type
== char_type_node
)
10830 type
= unsigned_char_type_node
;
10831 else if (typedef_decl
)
10832 type
= unsigned_type_for (type
);
10834 type
= unsigned_type_node
;
10836 else if (signed_p
&& type
== char_type_node
)
10837 type
= signed_char_type_node
;
10838 else if (explicit_intN
)
10839 type
= int_n_trees
[declspecs
->int_n_idx
].signed_type
;
10841 type
= long_long_integer_type_node
;
10843 type
= long_integer_type_node
;
10845 type
= short_integer_type_node
;
10847 if (decl_spec_seq_has_spec_p (declspecs
, ds_complex
))
10849 if (TREE_CODE (type
) != INTEGER_TYPE
&& TREE_CODE (type
) != REAL_TYPE
)
10850 error ("complex invalid for %qs", name
);
10851 /* If a modifier is specified, the resulting complex is the complex
10852 form of TYPE. E.g, "complex short" is "complex short int". */
10853 else if (type
== integer_type_node
)
10854 type
= complex_integer_type_node
;
10855 else if (type
== float_type_node
)
10856 type
= complex_float_type_node
;
10857 else if (type
== double_type_node
)
10858 type
= complex_double_type_node
;
10859 else if (type
== long_double_type_node
)
10860 type
= complex_long_double_type_node
;
10862 type
= build_complex_type (type
);
10865 /* If we're using the injected-class-name to form a compound type or a
10866 declaration, replace it with the underlying class so we don't get
10867 redundant typedefs in the debug output. But if we are returning the
10868 type unchanged, leave it alone so that it's available to
10869 maybe_get_template_decl_from_type_decl. */
10870 if (CLASS_TYPE_P (type
)
10871 && DECL_SELF_REFERENCE_P (TYPE_NAME (type
))
10872 && type
== TREE_TYPE (TYPE_NAME (type
))
10873 && (declarator
|| type_quals
))
10874 type
= DECL_ORIGINAL_TYPE (TYPE_NAME (type
));
10876 type_quals
|= cp_type_quals (type
);
10877 type
= cp_build_qualified_type_real
10878 (type
, type_quals
, ((((typedef_decl
&& !DECL_ARTIFICIAL (typedef_decl
))
10879 || declspecs
->decltype_p
)
10880 ? tf_ignore_bad_quals
: 0) | tf_warning_or_error
));
10881 /* We might have ignored or rejected some of the qualifiers. */
10882 type_quals
= cp_type_quals (type
);
10884 if (cxx_dialect
>= cxx17
&& type
&& is_auto (type
)
10885 && innermost_code
!= cdk_function
10886 && id_declarator
&& declarator
!= id_declarator
)
10887 if (tree tmpl
= CLASS_PLACEHOLDER_TEMPLATE (type
))
10889 error_at (typespec_loc
, "template placeholder type %qT must be followed "
10890 "by a simple declarator-id", type
);
10891 inform (DECL_SOURCE_LOCATION (tmpl
), "%qD declared here", tmpl
);
10895 inlinep
= decl_spec_seq_has_spec_p (declspecs
, ds_inline
);
10896 virtualp
= decl_spec_seq_has_spec_p (declspecs
, ds_virtual
);
10897 explicitp
= decl_spec_seq_has_spec_p (declspecs
, ds_explicit
);
10899 storage_class
= declspecs
->storage_class
;
10900 if (storage_class
== sc_static
)
10901 staticp
= 1 + (decl_context
== FIELD
);
10907 gcc_rich_location
richloc (declspecs
->locations
[ds_virtual
]);
10908 richloc
.add_range (declspecs
->locations
[ds_storage_class
]);
10909 error_at (&richloc
, "member %qD cannot be declared both %<virtual%> "
10910 "and %<static%>", dname
);
10911 storage_class
= sc_none
;
10914 if (constexpr_p
&& cxx_dialect
< cxx2a
)
10916 gcc_rich_location
richloc (declspecs
->locations
[ds_virtual
]);
10917 richloc
.add_range (declspecs
->locations
[ds_constexpr
]);
10918 pedwarn (&richloc
, OPT_Wpedantic
, "member %qD can be declared both "
10919 "%<virtual%> and %<constexpr%> only in -std=c++2a or "
10920 "-std=gnu++2a", dname
);
10923 friendp
= decl_spec_seq_has_spec_p (declspecs
, ds_friend
);
10925 /* Issue errors about use of storage classes for parameters. */
10926 if (decl_context
== PARM
)
10930 error_at (declspecs
->locations
[ds_typedef
],
10931 "typedef declaration invalid in parameter declaration");
10932 return error_mark_node
;
10934 else if (template_parm_flag
&& storage_class
!= sc_none
)
10936 error_at (min_location (declspecs
->locations
[ds_thread
],
10937 declspecs
->locations
[ds_storage_class
]),
10938 "storage class specified for template parameter %qs",
10940 return error_mark_node
;
10942 else if (storage_class
== sc_static
10943 || storage_class
== sc_extern
10946 error_at (min_location (declspecs
->locations
[ds_thread
],
10947 declspecs
->locations
[ds_storage_class
]),
10948 "storage class specified for parameter %qs", name
);
10949 return error_mark_node
;
10952 /* Function parameters cannot be concept. */
10954 error_at (declspecs
->locations
[ds_concept
],
10955 "a parameter cannot be declared %<concept%>");
10956 /* Function parameters cannot be constexpr. If we saw one, moan
10957 and pretend it wasn't there. */
10958 else if (constexpr_p
)
10960 error_at (declspecs
->locations
[ds_constexpr
],
10961 "a parameter cannot be declared %<constexpr%>");
10966 /* Give error if `virtual' is used outside of class declaration. */
10968 && (current_class_name
== NULL_TREE
|| decl_context
!= FIELD
))
10970 error_at (declspecs
->locations
[ds_virtual
],
10971 "%<virtual%> outside class declaration");
10975 if (innermost_code
== cdk_decomp
)
10977 location_t loc
= (declarator
->kind
== cdk_reference
10978 ? declarator
->declarator
->id_loc
: declarator
->id_loc
);
10980 error_at (declspecs
->locations
[ds_inline
],
10981 "structured binding declaration cannot be %<inline%>");
10983 error_at (declspecs
->locations
[ds_typedef
],
10984 "structured binding declaration cannot be %<typedef%>");
10986 error_at (declspecs
->locations
[ds_constexpr
], "structured "
10987 "binding declaration cannot be %<constexpr%>");
10989 error_at (declspecs
->locations
[ds_thread
],
10990 "structured binding declaration cannot be %qs",
10991 declspecs
->gnu_thread_keyword_p
10992 ? "__thread" : "thread_local");
10994 error_at (declspecs
->locations
[ds_concept
],
10995 "structured binding declaration cannot be %<concept%>");
10996 switch (storage_class
)
11001 error_at (loc
, "structured binding declaration cannot be "
11005 error_at (loc
, "structured binding declaration cannot be "
11009 error_at (loc
, "structured binding declaration cannot be "
11013 error_at (loc
, "structured binding declaration cannot be "
11017 error_at (loc
, "structured binding declaration cannot be "
11021 gcc_unreachable ();
11023 if (TREE_CODE (type
) != TEMPLATE_TYPE_PARM
11024 || TYPE_IDENTIFIER (type
) != auto_identifier
)
11026 if (type
!= error_mark_node
)
11028 error_at (loc
, "structured binding declaration cannot have "
11031 "type must be cv-qualified %<auto%> or reference to "
11032 "cv-qualified %<auto%>");
11034 type
= build_qualified_type (make_auto (), type_quals
);
11035 declspecs
->type
= type
;
11042 storage_class
= sc_none
;
11044 declspecs
->storage_class
= sc_none
;
11045 declspecs
->locations
[ds_thread
] = UNKNOWN_LOCATION
;
11048 /* Static anonymous unions are dealt with here. */
11049 if (staticp
&& decl_context
== TYPENAME
11051 && ANON_AGGR_TYPE_P (declspecs
->type
))
11052 decl_context
= FIELD
;
11054 /* Warn about storage classes that are invalid for certain
11055 kinds of declarations (parameters, typenames, etc.). */
11058 && storage_class
!= sc_extern
11059 && storage_class
!= sc_static
)
11062 error ("multiple storage classes in declaration of %qs", name
);
11065 if (decl_context
!= NORMAL
11066 && ((storage_class
!= sc_none
11067 && storage_class
!= sc_mutable
)
11070 if ((decl_context
== PARM
|| decl_context
== CATCHPARM
)
11071 && (storage_class
== sc_register
11072 || storage_class
== sc_auto
))
11074 else if (typedef_p
)
11076 else if (decl_context
== FIELD
11077 /* C++ allows static class elements. */
11078 && storage_class
== sc_static
)
11079 /* C++ also allows inlines and signed and unsigned elements,
11080 but in those cases we don't come in here. */
11085 = min_location (declspecs
->locations
[ds_thread
],
11086 declspecs
->locations
[ds_storage_class
]);
11087 if (decl_context
== FIELD
)
11088 error_at (loc
, "storage class specified for %qs", name
);
11089 else if (decl_context
== PARM
|| decl_context
== CATCHPARM
)
11090 error_at (loc
, "storage class specified for parameter %qs", name
);
11092 error_at (loc
, "storage class specified for typename");
11093 if (storage_class
== sc_register
11094 || storage_class
== sc_auto
11095 || storage_class
== sc_extern
11097 storage_class
= sc_none
;
11100 else if (storage_class
== sc_extern
&& funcdef_flag
11101 && ! toplevel_bindings_p ())
11102 error ("nested function %qs declared %<extern%>", name
);
11103 else if (toplevel_bindings_p ())
11105 if (storage_class
== sc_auto
)
11106 error ("top-level declaration of %qs specifies %<auto%>", name
);
11109 && storage_class
!= sc_extern
11110 && storage_class
!= sc_static
)
11112 if (declspecs
->gnu_thread_keyword_p
)
11113 pedwarn (declspecs
->locations
[ds_thread
],
11114 0, "function-scope %qs implicitly auto and "
11115 "declared %<__thread%>", name
);
11117 /* When thread_local is applied to a variable of block scope the
11118 storage-class-specifier static is implied if it does not appear
11120 storage_class
= declspecs
->storage_class
= sc_static
;
11124 if (storage_class
&& friendp
)
11126 error_at (min_location (declspecs
->locations
[ds_thread
],
11127 declspecs
->locations
[ds_storage_class
]),
11128 "storage class specifiers invalid in friend function "
11130 storage_class
= sc_none
;
11134 if (!id_declarator
)
11135 unqualified_id
= NULL_TREE
;
11138 unqualified_id
= id_declarator
->u
.id
.unqualified_name
;
11139 switch (TREE_CODE (unqualified_id
))
11142 unqualified_id
= TREE_OPERAND (unqualified_id
, 0);
11143 if (TYPE_P (unqualified_id
))
11144 unqualified_id
= constructor_name (unqualified_id
);
11147 case IDENTIFIER_NODE
:
11148 case TEMPLATE_ID_EXPR
:
11152 gcc_unreachable ();
11156 if (declspecs
->std_attributes
)
11158 location_t attr_loc
= declspecs
->locations
[ds_std_attribute
];
11159 if (warning_at (attr_loc
, OPT_Wattributes
, "attribute ignored"))
11160 inform (attr_loc
, "an attribute that appertains to a type-specifier "
11164 /* Determine the type of the entity declared by recurring on the
11166 for (; declarator
; declarator
= declarator
->declarator
)
11168 const cp_declarator
*inner_declarator
;
11171 if (type
== error_mark_node
)
11172 return error_mark_node
;
11174 attrs
= declarator
->attributes
;
11180 if (declarator
== NULL
|| declarator
->kind
== cdk_id
)
11181 attr_flags
|= (int) ATTR_FLAG_DECL_NEXT
;
11182 if (declarator
->kind
== cdk_function
)
11183 attr_flags
|= (int) ATTR_FLAG_FUNCTION_NEXT
;
11184 if (declarator
->kind
== cdk_array
)
11185 attr_flags
|= (int) ATTR_FLAG_ARRAY_NEXT
;
11186 returned_attrs
= decl_attributes (&type
,
11187 chainon (returned_attrs
, attrs
),
11191 inner_declarator
= declarator
->declarator
;
11193 /* We don't want to warn in parameter context because we don't
11194 yet know if the parse will succeed, and this might turn out
11195 to be a constructor call. */
11196 if (decl_context
!= PARM
11197 && decl_context
!= TYPENAME
11199 && declarator
->parenthesized
!= UNKNOWN_LOCATION
11200 /* If the type is class-like and the inner name used a
11201 global namespace qualifier, we need the parens.
11202 Unfortunately all we can tell is whether a qualified name
11203 was used or not. */
11204 && !(inner_declarator
11205 && inner_declarator
->kind
== cdk_id
11206 && inner_declarator
->u
.id
.qualifying_scope
11207 && (MAYBE_CLASS_TYPE_P (type
)
11208 || TREE_CODE (type
) == ENUMERAL_TYPE
)))
11209 warning_at (declarator
->parenthesized
, OPT_Wparentheses
,
11210 "unnecessary parentheses in declaration of %qs", name
);
11211 if (declarator
->kind
== cdk_id
|| declarator
->kind
== cdk_decomp
)
11214 switch (declarator
->kind
)
11217 type
= create_array_type_for_decl (dname
, type
,
11218 declarator
->u
.array
.bounds
,
11219 declarator
->id_loc
);
11220 if (!valid_array_size_p (input_location
, type
, dname
))
11221 type
= error_mark_node
;
11223 if (declarator
->std_attributes
)
11226 The optional attribute-specifier-seq appertains to the
11228 returned_attrs
= chainon (returned_attrs
,
11229 declarator
->std_attributes
);
11237 /* Declaring a function type. */
11239 input_location
= declspecs
->locations
[ds_type_spec
];
11240 abstract_virtuals_error (ACU_RETURN
, type
);
11241 input_location
= saved_loc
;
11243 /* Pick up type qualifiers which should be applied to `this'. */
11244 memfn_quals
= declarator
->u
.function
.qualifiers
;
11245 /* Pick up virt-specifiers. */
11246 virt_specifiers
= declarator
->u
.function
.virt_specifiers
;
11247 /* And ref-qualifier, too */
11248 rqual
= declarator
->u
.function
.ref_qualifier
;
11249 /* And tx-qualifier. */
11250 tree tx_qual
= declarator
->u
.function
.tx_qualifier
;
11251 /* Pick up the exception specifications. */
11252 raises
= declarator
->u
.function
.exception_specification
;
11253 /* If the exception-specification is ill-formed, let's pretend
11254 there wasn't one. */
11255 if (raises
== error_mark_node
)
11256 raises
= NULL_TREE
;
11259 error_at (location_of (reqs
), "requires-clause on return type");
11260 reqs
= declarator
->u
.function
.requires_clause
;
11262 /* Say it's a definition only for the CALL_EXPR
11263 closest to the identifier. */
11264 funcdecl_p
= inner_declarator
&& inner_declarator
->kind
== cdk_id
;
11266 /* Handle a late-specified return type. */
11267 tree late_return_type
= declarator
->u
.function
.late_return_type
;
11269 /* This is the case e.g. for
11270 using T = auto () -> int. */
11271 || inner_declarator
== NULL
)
11273 if (tree auto_node
= type_uses_auto (type
))
11275 if (!late_return_type
)
11277 if (current_class_type
11278 && LAMBDA_TYPE_P (current_class_type
))
11279 /* OK for C++11 lambdas. */;
11280 else if (cxx_dialect
< cxx14
)
11282 error ("%qs function uses "
11283 "%<auto%> type specifier without trailing "
11284 "return type", name
);
11285 inform (input_location
, "deduced return type "
11286 "only available with -std=c++14 or "
11291 error ("virtual function cannot "
11292 "have deduced return type");
11296 else if (!is_auto (type
) && sfk
!= sfk_conversion
)
11298 error ("%qs function with trailing return type has"
11299 " %qT as its type rather than plain %<auto%>",
11301 return error_mark_node
;
11303 else if (is_auto (type
) && AUTO_IS_DECLTYPE (type
))
11306 error ("%qs function with trailing return type has "
11307 "%<decltype(auto)%> as its type rather than "
11308 "plain %<auto%>", name
);
11310 error ("invalid use of %<decltype(auto)%>");
11311 return error_mark_node
;
11313 tree tmpl
= CLASS_PLACEHOLDER_TEMPLATE (auto_node
);
11315 if (tree late_auto
= type_uses_auto (late_return_type
))
11316 tmpl
= CLASS_PLACEHOLDER_TEMPLATE (late_auto
);
11317 if (tmpl
&& funcdecl_p
)
11319 if (!dguide_name_p (unqualified_id
))
11321 error_at (declarator
->id_loc
, "deduced class "
11322 "type %qD in function return type",
11324 inform (DECL_SOURCE_LOCATION (tmpl
),
11325 "%qD declared here", tmpl
);
11326 return error_mark_node
;
11328 else if (!late_return_type
)
11330 error_at (declarator
->id_loc
, "deduction guide "
11331 "for %qT must have trailing return "
11332 "type", TREE_TYPE (tmpl
));
11333 inform (DECL_SOURCE_LOCATION (tmpl
),
11334 "%qD declared here", tmpl
);
11335 return error_mark_node
;
11337 else if (CLASS_TYPE_P (late_return_type
)
11338 && CLASSTYPE_TEMPLATE_INFO (late_return_type
)
11339 && (CLASSTYPE_TI_TEMPLATE (late_return_type
)
11343 error ("trailing return type %qT of deduction guide "
11344 "is not a specialization of %qT",
11345 late_return_type
, TREE_TYPE (tmpl
));
11348 else if (late_return_type
11349 && sfk
!= sfk_conversion
)
11351 if (cxx_dialect
< cxx11
)
11352 /* Not using maybe_warn_cpp0x because this should
11353 always be an error. */
11354 error ("trailing return type only available with "
11355 "-std=c++11 or -std=gnu++11");
11357 error ("%qs function with trailing return type not "
11358 "declared with %<auto%> type specifier", name
);
11359 return error_mark_node
;
11362 type
= splice_late_return_type (type
, late_return_type
);
11363 if (type
== error_mark_node
)
11364 return error_mark_node
;
11366 if (late_return_type
)
11368 late_return_type_p
= true;
11369 type_quals
= cp_type_quals (type
);
11372 if (type_quals
!= TYPE_UNQUALIFIED
)
11374 if (SCALAR_TYPE_P (type
) || VOID_TYPE_P (type
))
11375 warning_at (typespec_loc
, OPT_Wignored_qualifiers
, "type "
11376 "qualifiers ignored on function return type");
11377 /* We now know that the TYPE_QUALS don't apply to the
11378 decl, but to its return type. */
11379 type_quals
= TYPE_UNQUALIFIED
;
11382 /* Error about some types functions can't return. */
11384 if (TREE_CODE (type
) == FUNCTION_TYPE
)
11386 error_at (typespec_loc
, "%qs declared as function returning "
11387 "a function", name
);
11388 return error_mark_node
;
11390 if (TREE_CODE (type
) == ARRAY_TYPE
)
11392 error_at (typespec_loc
, "%qs declared as function returning "
11394 return error_mark_node
;
11397 if (ctype
== NULL_TREE
11398 && decl_context
== FIELD
11401 ctype
= current_class_type
;
11403 if (ctype
&& (sfk
== sfk_constructor
11404 || sfk
== sfk_destructor
))
11406 /* We are within a class's scope. If our declarator name
11407 is the same as the class name, and we are defining
11408 a function, then it is a constructor/destructor, and
11409 therefore returns a void type. */
11411 /* ISO C++ 12.4/2. A destructor may not be declared
11412 const or volatile. A destructor may not be static.
11413 A destructor may not be declared with ref-qualifier.
11415 ISO C++ 12.1. A constructor may not be declared
11416 const or volatile. A constructor may not be
11417 virtual. A constructor may not be static.
11418 A constructor may not be declared with ref-qualifier. */
11420 error ((flags
== DTOR_FLAG
)
11421 ? G_("destructor cannot be static member function")
11422 : G_("constructor cannot be static member function"));
11425 error ((flags
== DTOR_FLAG
)
11426 ? G_("destructors may not be cv-qualified")
11427 : G_("constructors may not be cv-qualified"));
11428 memfn_quals
= TYPE_UNQUALIFIED
;
11433 maybe_warn_cpp0x (CPP0X_REF_QUALIFIER
);
11434 error ((flags
== DTOR_FLAG
)
11435 ? G_("destructors may not be ref-qualified")
11436 : G_("constructors may not be ref-qualified"));
11437 rqual
= REF_QUAL_NONE
;
11440 if (decl_context
== FIELD
11441 && !member_function_or_else (ctype
,
11442 current_class_type
,
11444 return error_mark_node
;
11446 if (flags
!= DTOR_FLAG
)
11448 /* It's a constructor. */
11449 if (explicitp
== 1)
11453 permerror (declspecs
->locations
[ds_virtual
],
11454 "constructors cannot be declared %<virtual%>");
11457 if (decl_context
== FIELD
11458 && sfk
!= sfk_constructor
)
11459 return error_mark_node
;
11461 if (decl_context
== FIELD
)
11468 /* Cannot be both friend and virtual. */
11469 gcc_rich_location
richloc (declspecs
->locations
[ds_virtual
]);
11470 richloc
.add_range (declspecs
->locations
[ds_friend
]);
11471 error_at (&richloc
, "virtual functions cannot be friends");
11474 if (decl_context
== NORMAL
)
11475 error ("friend declaration not in class definition");
11476 if (current_function_decl
&& funcdef_flag
)
11478 error ("can%'t define friend function %qs in a local "
11479 "class definition", name
);
11483 else if (ctype
&& sfk
== sfk_conversion
)
11485 if (explicitp
== 1)
11487 maybe_warn_cpp0x (CPP0X_EXPLICIT_CONVERSION
);
11490 if (late_return_type_p
)
11491 error ("a conversion function cannot have a trailing return type");
11493 else if (sfk
== sfk_deduction_guide
)
11495 if (explicitp
== 1)
11499 tree pushed_scope
= NULL_TREE
;
11501 && decl_context
!= FIELD
11502 && inner_declarator
->u
.id
.qualifying_scope
11503 && CLASS_TYPE_P (inner_declarator
->u
.id
.qualifying_scope
))
11505 = push_scope (inner_declarator
->u
.id
.qualifying_scope
);
11507 arg_types
= grokparms (declarator
->u
.function
.parameters
, &parms
);
11510 pop_scope (pushed_scope
);
11512 if (inner_declarator
11513 && inner_declarator
->kind
== cdk_id
11514 && inner_declarator
->u
.id
.sfk
== sfk_destructor
11515 && arg_types
!= void_list_node
)
11517 error ("destructors may not have parameters");
11518 arg_types
= void_list_node
;
11522 type
= build_function_type (type
, arg_types
);
11524 tree attrs
= declarator
->std_attributes
;
11527 tree att
= build_tree_list (tx_qual
, NULL_TREE
);
11528 /* transaction_safe applies to the type, but
11529 transaction_safe_dynamic applies to the function. */
11530 if (is_attribute_p ("transaction_safe", tx_qual
))
11531 attrs
= chainon (attrs
, att
);
11533 returned_attrs
= chainon (returned_attrs
, att
);
11538 The optional attribute-specifier-seq appertains to
11539 the function type. */
11540 decl_attributes (&type
, attrs
, 0);
11543 type
= build_exception_variant (type
, raises
);
11548 case cdk_reference
:
11550 /* Filter out pointers-to-references and references-to-references.
11551 We can get these if a TYPE_DECL is used. */
11553 if (TYPE_REF_P (type
))
11555 if (declarator
->kind
!= cdk_reference
)
11557 error ("cannot declare pointer to %q#T", type
);
11558 type
= TREE_TYPE (type
);
11561 /* In C++0x, we allow reference to reference declarations
11562 that occur indirectly through typedefs [7.1.3/8 dcl.typedef]
11563 and template type arguments [14.3.1/4 temp.arg.type]. The
11564 check for direct reference to reference declarations, which
11565 are still forbidden, occurs below. Reasoning behind the change
11566 can be found in DR106, DR540, and the rvalue reference
11568 else if (cxx_dialect
== cxx98
)
11570 error ("cannot declare reference to %q#T", type
);
11571 type
= TREE_TYPE (type
);
11574 else if (VOID_TYPE_P (type
))
11576 if (declarator
->kind
== cdk_reference
)
11577 error ("cannot declare reference to %q#T", type
);
11578 else if (declarator
->kind
== cdk_ptrmem
)
11579 error ("cannot declare pointer to %q#T member", type
);
11582 /* We now know that the TYPE_QUALS don't apply to the decl,
11583 but to the target of the pointer. */
11584 type_quals
= TYPE_UNQUALIFIED
;
11586 /* This code used to handle METHOD_TYPE, but I don't think it's
11587 possible to get it here anymore. */
11588 gcc_assert (TREE_CODE (type
) != METHOD_TYPE
);
11589 if (declarator
->kind
== cdk_ptrmem
11590 && TREE_CODE (type
) == FUNCTION_TYPE
)
11592 memfn_quals
|= type_memfn_quals (type
);
11593 type
= build_memfn_type (type
,
11594 declarator
->u
.pointer
.class_type
,
11597 if (type
== error_mark_node
)
11598 return error_mark_node
;
11600 rqual
= REF_QUAL_NONE
;
11601 memfn_quals
= TYPE_UNQUALIFIED
;
11604 if (TREE_CODE (type
) == FUNCTION_TYPE
11605 && (type_memfn_quals (type
) != TYPE_UNQUALIFIED
11606 || type_memfn_rqual (type
) != REF_QUAL_NONE
))
11607 error (declarator
->kind
== cdk_reference
11608 ? G_("cannot declare reference to qualified function type %qT")
11609 : G_("cannot declare pointer to qualified function type %qT"),
11612 /* When the pointed-to type involves components of variable size,
11613 care must be taken to ensure that the size evaluation code is
11614 emitted early enough to dominate all the possible later uses
11615 and late enough for the variables on which it depends to have
11618 This is expected to happen automatically when the pointed-to
11619 type has a name/declaration of it's own, but special attention
11620 is required if the type is anonymous.
11622 We handle the NORMAL and FIELD contexts here by inserting a
11623 dummy statement that just evaluates the size at a safe point
11624 and ensures it is not deferred until e.g. within a deeper
11625 conditional context (c++/43555).
11627 We expect nothing to be needed here for PARM or TYPENAME.
11628 Evaluating the size at this point for TYPENAME would
11629 actually be incorrect, as we might be in the middle of an
11630 expression with side effects on the pointed-to type size
11631 "arguments" prior to the pointer declaration point and the
11632 size evaluation could end up prior to the side effects. */
11634 if (!TYPE_NAME (type
)
11635 && (decl_context
== NORMAL
|| decl_context
== FIELD
)
11636 && at_function_scope_p ()
11637 && variably_modified_type_p (type
, NULL_TREE
))
11639 TYPE_NAME (type
) = build_decl (UNKNOWN_LOCATION
, TYPE_DECL
,
11641 add_decl_expr (TYPE_NAME (type
));
11644 if (declarator
->kind
== cdk_reference
)
11646 /* In C++0x, the type we are creating a reference to might be
11647 a typedef which is itself a reference type. In that case,
11648 we follow the reference collapsing rules in
11649 [7.1.3/8 dcl.typedef] to create the final reference type:
11651 "If a typedef TD names a type that is a reference to a type
11652 T, an attempt to create the type 'lvalue reference to cv TD'
11653 creates the type 'lvalue reference to T,' while an attempt
11654 to create the type "rvalue reference to cv TD' creates the
11657 if (VOID_TYPE_P (type
))
11658 /* We already gave an error. */;
11659 else if (TYPE_REF_P (type
))
11661 if (declarator
->u
.reference
.rvalue_ref
)
11662 /* Leave type alone. */;
11664 type
= cp_build_reference_type (TREE_TYPE (type
), false);
11667 type
= cp_build_reference_type
11668 (type
, declarator
->u
.reference
.rvalue_ref
);
11670 /* In C++0x, we need this check for direct reference to
11671 reference declarations, which are forbidden by
11672 [8.3.2/5 dcl.ref]. Reference to reference declarations
11673 are only allowed indirectly through typedefs and template
11674 type arguments. Example:
11676 void foo(int & &); // invalid ref-to-ref decl
11678 typedef int & int_ref;
11679 void foo(int_ref &); // valid ref-to-ref decl
11681 if (inner_declarator
&& inner_declarator
->kind
== cdk_reference
)
11682 error ("cannot declare reference to %q#T, which is not "
11683 "a typedef or a template type argument", type
);
11685 else if (TREE_CODE (type
) == METHOD_TYPE
)
11686 type
= build_ptrmemfunc_type (build_pointer_type (type
));
11687 else if (declarator
->kind
== cdk_ptrmem
)
11689 gcc_assert (TREE_CODE (declarator
->u
.pointer
.class_type
)
11690 != NAMESPACE_DECL
);
11691 if (declarator
->u
.pointer
.class_type
== error_mark_node
)
11692 /* We will already have complained. */
11693 type
= error_mark_node
;
11695 type
= build_ptrmem_type (declarator
->u
.pointer
.class_type
,
11699 type
= build_pointer_type (type
);
11701 /* Process a list of type modifier keywords (such as
11702 const or volatile) that were given inside the `*' or `&'. */
11704 if (declarator
->u
.pointer
.qualifiers
)
11707 = cp_build_qualified_type (type
,
11708 declarator
->u
.pointer
.qualifiers
);
11709 type_quals
= cp_type_quals (type
);
11712 /* Apply C++11 attributes to the pointer, and not to the
11713 type pointed to. This is unlike what is done for GNU
11714 attributes above. It is to comply with [dcl.ptr]/1:
11716 [the optional attribute-specifier-seq (7.6.1) appertains
11717 to the pointer and not to the object pointed to]. */
11718 if (declarator
->std_attributes
)
11719 decl_attributes (&type
, declarator
->std_attributes
,
11729 gcc_unreachable ();
11733 /* A `constexpr' specifier used in an object declaration declares
11734 the object as `const'. */
11735 if (constexpr_p
&& innermost_code
!= cdk_function
)
11737 /* DR1688 says that a `constexpr' specifier in combination with
11738 `volatile' is valid. */
11740 if (!TYPE_REF_P (type
))
11742 type_quals
|= TYPE_QUAL_CONST
;
11743 type
= cp_build_qualified_type (type
, type_quals
);
11747 if (unqualified_id
&& TREE_CODE (unqualified_id
) == TEMPLATE_ID_EXPR
11748 && TREE_CODE (type
) != FUNCTION_TYPE
11749 && TREE_CODE (type
) != METHOD_TYPE
11750 && !variable_template_p (TREE_OPERAND (unqualified_id
, 0)))
11752 error ("template-id %qD used as a declarator",
11754 unqualified_id
= dname
;
11757 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
11758 qualified with a class-name, turn it into a METHOD_TYPE, unless
11759 we know that the function is static. We take advantage of this
11760 opportunity to do other processing that pertains to entities
11761 explicitly declared to be class members. Note that if DECLARATOR
11762 is non-NULL, we know it is a cdk_id declarator; otherwise, we
11763 would not have exited the loop above. */
11765 && declarator
->kind
== cdk_id
11766 && declarator
->u
.id
.qualifying_scope
11767 && MAYBE_CLASS_TYPE_P (declarator
->u
.id
.qualifying_scope
))
11769 ctype
= declarator
->u
.id
.qualifying_scope
;
11770 ctype
= TYPE_MAIN_VARIANT (ctype
);
11771 template_count
= num_template_headers_for_class (ctype
);
11773 if (ctype
== current_class_type
)
11777 permerror (input_location
, "member functions are implicitly "
11778 "friends of their class");
11782 permerror (declarator
->id_loc
,
11783 "extra qualification %<%T::%> on member %qs",
11786 else if (/* If the qualifying type is already complete, then we
11787 can skip the following checks. */
11788 !COMPLETE_TYPE_P (ctype
)
11789 && (/* If the function is being defined, then
11790 qualifying type must certainly be complete. */
11792 /* A friend declaration of "T::f" is OK, even if
11793 "T" is a template parameter. But, if this
11794 function is not a friend, the qualifying type
11795 must be a class. */
11796 || (!friendp
&& !CLASS_TYPE_P (ctype
))
11797 /* For a declaration, the type need not be
11798 complete, if either it is dependent (since there
11799 is no meaningful definition of complete in that
11800 case) or the qualifying class is currently being
11802 || !(dependent_type_p (ctype
)
11803 || currently_open_class (ctype
)))
11804 /* Check that the qualifying type is complete. */
11805 && !complete_type_or_else (ctype
, NULL_TREE
))
11806 return error_mark_node
;
11807 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
11809 if (current_class_type
11810 && (!friendp
|| funcdef_flag
|| initialized
))
11812 error (funcdef_flag
|| initialized
11813 ? G_("cannot define member function %<%T::%s%> "
11815 : G_("cannot declare member function %<%T::%s%> "
11817 ctype
, name
, current_class_type
);
11818 return error_mark_node
;
11821 else if (typedef_p
&& current_class_type
)
11823 error ("cannot declare member %<%T::%s%> within %qT",
11824 ctype
, name
, current_class_type
);
11825 return error_mark_node
;
11829 if (ctype
== NULL_TREE
&& decl_context
== FIELD
&& friendp
== 0)
11830 ctype
= current_class_type
;
11832 /* Now TYPE has the actual type. */
11834 if (returned_attrs
)
11837 *attrlist
= chainon (returned_attrs
, *attrlist
);
11839 attrlist
= &returned_attrs
;
11843 && declarator
->kind
== cdk_id
11844 && declarator
->std_attributes
11845 && attrlist
!= NULL
)
11847 /* [dcl.meaning]/1: The optional attribute-specifier-seq following
11848 a declarator-id appertains to the entity that is declared. */
11849 if (declarator
->std_attributes
!= error_mark_node
)
11850 *attrlist
= chainon (*attrlist
, declarator
->std_attributes
);
11852 /* We should have already diagnosed the issue (c++/78344). */
11853 gcc_assert (seen_error ());
11856 /* Handle parameter packs. */
11857 if (parameter_pack_p
)
11859 if (decl_context
== PARM
)
11860 /* Turn the type into a pack expansion.*/
11861 type
= make_pack_expansion (type
);
11863 error ("non-parameter %qs cannot be a parameter pack", name
);
11866 if ((decl_context
== FIELD
|| decl_context
== PARM
)
11867 && !processing_template_decl
11868 && variably_modified_type_p (type
, NULL_TREE
))
11870 if (decl_context
== FIELD
)
11871 error ("data member may not have variably modified type %qT", type
);
11873 error ("parameter may not have variably modified type %qT", type
);
11874 type
= error_mark_node
;
11877 if (explicitp
== 1 || (explicitp
&& friendp
))
11879 /* [dcl.fct.spec] (C++11) The explicit specifier shall be used only
11880 in the declaration of a constructor or conversion function within
11881 a class definition. */
11882 if (!current_class_type
)
11883 error_at (declspecs
->locations
[ds_explicit
],
11884 "%<explicit%> outside class declaration");
11886 error_at (declspecs
->locations
[ds_explicit
],
11887 "%<explicit%> in friend declaration");
11889 error_at (declspecs
->locations
[ds_explicit
],
11890 "only declarations of constructors and conversion operators "
11891 "can be %<explicit%>");
11895 if (storage_class
== sc_mutable
)
11897 if (decl_context
!= FIELD
|| friendp
)
11899 error ("non-member %qs cannot be declared %<mutable%>", name
);
11900 storage_class
= sc_none
;
11902 else if (decl_context
== TYPENAME
|| typedef_p
)
11904 error ("non-object member %qs cannot be declared %<mutable%>", name
);
11905 storage_class
= sc_none
;
11907 else if (TREE_CODE (type
) == FUNCTION_TYPE
11908 || TREE_CODE (type
) == METHOD_TYPE
)
11910 error ("function %qs cannot be declared %<mutable%>", name
);
11911 storage_class
= sc_none
;
11915 error ("static %qs cannot be declared %<mutable%>", name
);
11916 storage_class
= sc_none
;
11918 else if (type_quals
& TYPE_QUAL_CONST
)
11920 error ("const %qs cannot be declared %<mutable%>", name
);
11921 storage_class
= sc_none
;
11923 else if (TYPE_REF_P (type
))
11925 permerror (input_location
, "reference %qs cannot be declared "
11926 "%<mutable%>", name
);
11927 storage_class
= sc_none
;
11931 /* If this is declaring a typedef name, return a TYPE_DECL. */
11932 if (typedef_p
&& decl_context
!= TYPENAME
)
11934 bool alias_p
= decl_spec_seq_has_spec_p (declspecs
, ds_alias
);
11937 /* This declaration:
11939 typedef void f(int) const;
11941 declares a function type which is not a member of any
11942 particular class, but which is cv-qualified; for
11943 example "f S::*" declares a pointer to a const-qualified
11944 member function of S. We record the cv-qualification in the
11946 if ((rqual
|| memfn_quals
) && TREE_CODE (type
) == FUNCTION_TYPE
)
11948 type
= apply_memfn_quals (type
, memfn_quals
, rqual
);
11950 /* We have now dealt with these qualifiers. */
11951 memfn_quals
= TYPE_UNQUALIFIED
;
11952 rqual
= REF_QUAL_NONE
;
11955 if (type_uses_auto (type
))
11958 error_at (declspecs
->locations
[ds_type_spec
],
11959 "%<auto%> not allowed in alias declaration");
11961 error_at (declspecs
->locations
[ds_type_spec
],
11962 "typedef declared %<auto%>");
11963 type
= error_mark_node
;
11967 error_at (location_of (reqs
), "requires-clause on typedef");
11969 if (id_declarator
&& declarator
->u
.id
.qualifying_scope
)
11971 error ("typedef name may not be a nested-name-specifier");
11972 type
= error_mark_node
;
11975 if (decl_context
== FIELD
)
11976 decl
= build_lang_decl (TYPE_DECL
, unqualified_id
, type
);
11978 decl
= build_decl (input_location
, TYPE_DECL
, unqualified_id
, type
);
11980 if (decl_context
!= FIELD
)
11982 if (!current_function_decl
)
11983 DECL_CONTEXT (decl
) = FROB_CONTEXT (current_namespace
);
11984 else if (DECL_MAYBE_IN_CHARGE_CDTOR_P (current_function_decl
))
11985 /* The TYPE_DECL is "abstract" because there will be
11986 clones of this constructor/destructor, and there will
11987 be copies of this TYPE_DECL generated in those
11988 clones. The decloning optimization (for space) may
11989 revert this subsequently if it determines that
11990 the clones should share a common implementation. */
11991 DECL_ABSTRACT_P (decl
) = true;
11993 else if (current_class_type
11994 && constructor_name_p (unqualified_id
, current_class_type
))
11995 permerror (input_location
, "ISO C++ forbids nested type %qD with same name "
11996 "as enclosing class",
11999 /* If the user declares "typedef struct {...} foo" then the
12000 struct will have an anonymous name. Fill that name in now.
12001 Nothing can refer to it, so nothing needs know about the name
12003 if (type
!= error_mark_node
12005 && TYPE_NAME (type
)
12006 && TREE_CODE (TYPE_NAME (type
)) == TYPE_DECL
12007 && TYPE_UNNAMED_P (type
)
12008 && declspecs
->type_definition_p
12009 && attributes_naming_typedef_ok (*attrlist
)
12010 && cp_type_quals (type
) == TYPE_UNQUALIFIED
)
12011 name_unnamed_type (type
, decl
);
12014 || (typedef_decl
&& C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl
)))
12015 C_TYPEDEF_EXPLICITLY_SIGNED (decl
) = 1;
12017 bad_specifiers (decl
, BSP_TYPE
, virtualp
,
12018 memfn_quals
!= TYPE_UNQUALIFIED
,
12019 inlinep
, friendp
, raises
!= NULL_TREE
,
12020 declspecs
->locations
);
12023 /* Acknowledge that this was written:
12024 `using analias = atype;'. */
12025 TYPE_DECL_ALIAS_P (decl
) = 1;
12030 /* Detect the case of an array type of unspecified size
12031 which came, as such, direct from a typedef name.
12032 We must copy the type, so that the array's domain can be
12033 individually set by the object's initializer. */
12035 if (type
&& typedef_type
12036 && TREE_CODE (type
) == ARRAY_TYPE
&& !TYPE_DOMAIN (type
)
12037 && TYPE_MAIN_VARIANT (type
) == TYPE_MAIN_VARIANT (typedef_type
))
12038 type
= build_cplus_array_type (TREE_TYPE (type
), NULL_TREE
);
12040 /* Detect where we're using a typedef of function type to declare a
12041 function. PARMS will not be set, so we must create it now. */
12043 if (type
== typedef_type
&& TREE_CODE (type
) == FUNCTION_TYPE
)
12045 tree decls
= NULL_TREE
;
12048 for (args
= TYPE_ARG_TYPES (type
);
12049 args
&& args
!= void_list_node
;
12050 args
= TREE_CHAIN (args
))
12052 tree decl
= cp_build_parm_decl (NULL_TREE
, NULL_TREE
,
12053 TREE_VALUE (args
));
12055 DECL_CHAIN (decl
) = decls
;
12059 parms
= nreverse (decls
);
12061 if (decl_context
!= TYPENAME
)
12063 /* The qualifiers on the function type become the qualifiers on
12064 the non-static member function. */
12065 memfn_quals
|= type_memfn_quals (type
);
12066 rqual
= type_memfn_rqual (type
);
12067 type_quals
= TYPE_UNQUALIFIED
;
12071 /* If this is a type name (such as, in a cast or sizeof),
12072 compute the type and return it now. */
12074 if (decl_context
== TYPENAME
)
12076 /* Note that here we don't care about type_quals. */
12078 /* Special case: "friend class foo" looks like a TYPENAME context. */
12083 error ("%<inline%> specified for friend class declaration");
12089 /* Don't allow friend declaration without a class-key. */
12090 if (TREE_CODE (type
) == TEMPLATE_TYPE_PARM
)
12091 permerror (input_location
, "template parameters cannot be friends");
12092 else if (TREE_CODE (type
) == TYPENAME_TYPE
)
12093 permerror (input_location
, "friend declaration requires class-key, "
12094 "i.e. %<friend class %T::%D%>",
12095 TYPE_CONTEXT (type
), TYPENAME_TYPE_FULLNAME (type
));
12097 permerror (input_location
, "friend declaration requires class-key, "
12098 "i.e. %<friend %#T%>",
12102 /* Only try to do this stuff if we didn't already give up. */
12103 if (type
!= integer_type_node
)
12105 /* A friendly class? */
12106 if (current_class_type
)
12107 make_friend_class (current_class_type
, TYPE_MAIN_VARIANT (type
),
12108 /*complain=*/true);
12110 error ("trying to make class %qT a friend of global scope",
12113 type
= void_type_node
;
12116 else if (memfn_quals
|| rqual
)
12118 if (ctype
== NULL_TREE
12119 && TREE_CODE (type
) == METHOD_TYPE
)
12120 ctype
= TYPE_METHOD_BASETYPE (type
);
12123 type
= build_memfn_type (type
, ctype
, memfn_quals
, rqual
);
12124 /* Core issue #547: need to allow this in template type args.
12125 Allow it in general in C++11 for alias-declarations. */
12126 else if ((template_type_arg
|| cxx_dialect
>= cxx11
)
12127 && TREE_CODE (type
) == FUNCTION_TYPE
)
12128 type
= apply_memfn_quals (type
, memfn_quals
, rqual
);
12130 error ("invalid qualifiers on non-member function type");
12134 error_at (location_of (reqs
), "requires-clause on type-id");
12138 else if (unqualified_id
== NULL_TREE
&& decl_context
!= PARM
12139 && decl_context
!= CATCHPARM
12140 && TREE_CODE (type
) != UNION_TYPE
12142 && innermost_code
!= cdk_decomp
)
12144 error ("abstract declarator %qT used as declaration", type
);
12145 return error_mark_node
;
12148 if (!FUNC_OR_METHOD_TYPE_P (type
))
12150 /* Only functions may be declared using an operator-function-id. */
12151 if (dname
&& IDENTIFIER_ANY_OP_P (dname
))
12153 error ("declaration of %qD as non-function", dname
);
12154 return error_mark_node
;
12158 error_at (location_of (reqs
),
12159 "requires-clause on declaration of non-function type %qT",
12163 /* We don't check parameter types here because we can emit a better
12164 error message later. */
12165 if (decl_context
!= PARM
)
12167 type
= check_var_type (unqualified_id
, type
);
12168 if (type
== error_mark_node
)
12169 return error_mark_node
;
12172 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
12173 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
12175 if (decl_context
== PARM
|| decl_context
== CATCHPARM
)
12177 if (ctype
|| in_namespace
)
12178 error ("cannot use %<::%> in parameter declaration");
12180 if (type_uses_auto (type
)
12181 && !(cxx_dialect
>= cxx17
&& template_parm_flag
))
12183 if (cxx_dialect
>= cxx14
)
12184 error ("%<auto%> parameter not permitted in this context");
12186 error ("parameter declared %<auto%>");
12187 type
= error_mark_node
;
12190 /* A parameter declared as an array of T is really a pointer to T.
12191 One declared as a function is really a pointer to a function.
12192 One declared as a member is really a pointer to member. */
12194 if (TREE_CODE (type
) == ARRAY_TYPE
)
12196 /* Transfer const-ness of array into that of type pointed to. */
12197 type
= build_pointer_type (TREE_TYPE (type
));
12198 type_quals
= TYPE_UNQUALIFIED
;
12199 array_parameter_p
= true;
12201 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
12202 type
= build_pointer_type (type
);
12205 if (ctype
&& TREE_CODE (type
) == FUNCTION_TYPE
&& staticp
< 2
12206 && !(unqualified_id
12207 && identifier_p (unqualified_id
)
12208 && IDENTIFIER_NEWDEL_OP_P (unqualified_id
)))
12210 cp_cv_quals real_quals
= memfn_quals
;
12211 if (cxx_dialect
< cxx14
&& constexpr_p
12212 && sfk
!= sfk_constructor
&& sfk
!= sfk_destructor
)
12213 real_quals
|= TYPE_QUAL_CONST
;
12214 type
= build_memfn_type (type
, ctype
, real_quals
, rqual
);
12218 tree decl
= NULL_TREE
;
12219 location_t loc
= declarator
? declarator
->id_loc
: input_location
;
12221 if (decl_context
== PARM
)
12223 decl
= cp_build_parm_decl (NULL_TREE
, unqualified_id
, type
);
12224 DECL_ARRAY_PARAMETER_P (decl
) = array_parameter_p
;
12226 bad_specifiers (decl
, BSP_PARM
, virtualp
,
12227 memfn_quals
!= TYPE_UNQUALIFIED
,
12228 inlinep
, friendp
, raises
!= NULL_TREE
,
12229 declspecs
->locations
);
12231 else if (decl_context
== FIELD
)
12233 if (!staticp
&& !friendp
&& TREE_CODE (type
) != METHOD_TYPE
)
12234 if (tree auto_node
= type_uses_auto (type
))
12236 location_t tloc
= declspecs
->locations
[ds_type_spec
];
12237 if (CLASS_PLACEHOLDER_TEMPLATE (auto_node
))
12238 error_at (tloc
, "invalid use of template-name %qE without an "
12240 CLASS_PLACEHOLDER_TEMPLATE (auto_node
));
12242 error_at (tloc
, "non-static data member declared with "
12243 "placeholder %qT", auto_node
);
12244 type
= error_mark_node
;
12247 /* The C99 flexible array extension. */
12248 if (!staticp
&& TREE_CODE (type
) == ARRAY_TYPE
12249 && TYPE_DOMAIN (type
) == NULL_TREE
)
12252 && (TREE_CODE (ctype
) == UNION_TYPE
12253 || TREE_CODE (ctype
) == QUAL_UNION_TYPE
))
12255 error ("flexible array member in union");
12256 type
= error_mark_node
;
12260 /* Array is a flexible member. */
12261 if (in_system_header_at (input_location
))
12262 /* Do not warn on flexible array members in system
12263 headers because glibc uses them. */;
12264 else if (name
&& declarator
)
12265 pedwarn (declarator
->id_loc
, OPT_Wpedantic
,
12266 "ISO C++ forbids flexible array member %qs", name
);
12268 pedwarn (input_location
, OPT_Wpedantic
,
12269 "ISO C++ forbids flexible array members");
12271 /* Flexible array member has a null domain. */
12272 type
= build_cplus_array_type (TREE_TYPE (type
), NULL_TREE
);
12276 if (type
== error_mark_node
)
12278 /* Happens when declaring arrays of sizes which
12279 are error_mark_node, for example. */
12282 else if (in_namespace
&& !friendp
)
12284 /* Something like struct S { int N::j; }; */
12285 error ("invalid use of %<::%>");
12286 return error_mark_node
;
12288 else if (FUNC_OR_METHOD_TYPE_P (type
) && unqualified_id
)
12291 tree function_context
;
12295 /* This should never happen in pure C++ (the check
12296 could be an assert). It could happen in
12297 Objective-C++ if someone writes invalid code that
12298 uses a function declaration for an instance
12299 variable or property (instance variables and
12300 properties are parsed as FIELD_DECLs, but they are
12301 part of an Objective-C class, not a C++ class).
12302 That code is invalid and is caught by this
12306 error ("declaration of function %qD in invalid context",
12308 return error_mark_node
;
12311 /* ``A union may [ ... ] not [ have ] virtual functions.''
12313 if (virtualp
&& TREE_CODE (ctype
) == UNION_TYPE
)
12315 error_at (declspecs
->locations
[ds_virtual
],
12316 "function %qD declared %<virtual%> inside a union",
12318 return error_mark_node
;
12322 && identifier_p (unqualified_id
)
12323 && IDENTIFIER_NEWDEL_OP_P (unqualified_id
))
12325 error_at (declspecs
->locations
[ds_virtual
],
12326 "%qD cannot be declared %<virtual%>, since it "
12327 "is always static", unqualified_id
);
12332 /* Check that the name used for a destructor makes sense. */
12333 if (sfk
== sfk_destructor
)
12335 tree uqname
= id_declarator
->u
.id
.unqualified_name
;
12339 gcc_assert (friendp
);
12340 error ("expected qualified name in friend declaration "
12341 "for destructor %qD", uqname
);
12342 return error_mark_node
;
12345 if (!check_dtor_name (ctype
, TREE_OPERAND (uqname
, 0)))
12347 error ("declaration of %qD as member of %qT",
12349 return error_mark_node
;
12353 error_at (declspecs
->locations
[ds_concept
],
12354 "a destructor cannot be %<concept%>");
12355 return error_mark_node
;
12359 error_at (declspecs
->locations
[ds_constexpr
],
12360 "a destructor cannot be %<constexpr%>");
12361 return error_mark_node
;
12364 else if (sfk
== sfk_constructor
&& friendp
&& !ctype
)
12366 error ("expected qualified name in friend declaration "
12367 "for constructor %qD",
12368 id_declarator
->u
.id
.unqualified_name
);
12369 return error_mark_node
;
12371 if (sfk
== sfk_constructor
)
12374 error_at (declspecs
->locations
[ds_concept
],
12375 "a constructor cannot be %<concept%>");
12376 return error_mark_node
;
12380 error_at (declspecs
->locations
[ds_concept
],
12381 "a concept cannot be a member function");
12385 if (TREE_CODE (unqualified_id
) == TEMPLATE_ID_EXPR
)
12387 tree tmpl
= TREE_OPERAND (unqualified_id
, 0);
12388 if (variable_template_p (tmpl
))
12390 error ("specialization of variable template %qD "
12391 "declared as function", tmpl
);
12392 inform (DECL_SOURCE_LOCATION (tmpl
),
12393 "variable template declared here");
12394 return error_mark_node
;
12398 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
12399 function_context
= (ctype
!= NULL_TREE
) ?
12400 decl_function_context (TYPE_MAIN_DECL (ctype
)) : NULL_TREE
;
12401 publicp
= (! friendp
|| ! staticp
)
12402 && function_context
== NULL_TREE
;
12404 decl
= grokfndecl (ctype
, type
,
12405 TREE_CODE (unqualified_id
) != TEMPLATE_ID_EXPR
12406 ? unqualified_id
: dname
,
12411 virtualp
, flags
, memfn_quals
, rqual
, raises
,
12412 friendp
? -1 : 0, friendp
, publicp
,
12413 inlinep
| (2 * constexpr_p
) | (4 * concept_p
),
12414 initialized
== SD_DELETED
, sfk
,
12415 funcdef_flag
, late_return_type_p
,
12416 template_count
, in_namespace
,
12417 attrlist
, declarator
->id_loc
);
12418 decl
= set_virt_specifiers (decl
, virt_specifiers
);
12419 if (decl
== NULL_TREE
)
12420 return error_mark_node
;
12422 /* This clobbers the attrs stored in `decl' from `attrlist'. */
12423 /* The decl and setting of decl_attr is also turned off. */
12424 decl
= build_decl_attribute_variant (decl
, decl_attr
);
12427 /* [class.conv.ctor]
12429 A constructor declared without the function-specifier
12430 explicit that can be called with a single parameter
12431 specifies a conversion from the type of its first
12432 parameter to the type of its class. Such a constructor
12433 is called a converting constructor. */
12434 if (explicitp
== 2)
12435 DECL_NONCONVERTING_P (decl
) = 1;
12437 if (declspecs
->explicit_specifier
)
12438 store_explicit_specifier (decl
, declspecs
->explicit_specifier
);
12440 else if (!staticp
&& !dependent_type_p (type
)
12441 && !COMPLETE_TYPE_P (complete_type (type
))
12442 && (!complete_or_array_type_p (type
)
12443 || initialized
== 0))
12445 if (TREE_CODE (type
) != ARRAY_TYPE
12446 || !COMPLETE_TYPE_P (TREE_TYPE (type
)))
12448 if (unqualified_id
)
12450 error_at (declarator
->id_loc
,
12451 "field %qD has incomplete type %qT",
12452 unqualified_id
, type
);
12453 cxx_incomplete_type_inform (strip_array_types (type
));
12456 error ("name %qT has incomplete type", type
);
12458 type
= error_mark_node
;
12466 if (unqualified_id
&& declarator
)
12467 error_at (declarator
->id_loc
,
12468 "%qE is neither function nor member function; "
12469 "cannot be declared friend", unqualified_id
);
12471 error ("unnamed field is neither function nor member "
12472 "function; cannot be declared friend");
12473 return error_mark_node
;
12480 /* Friends are treated specially. */
12481 if (ctype
== current_class_type
)
12482 ; /* We already issued a permerror. */
12483 else if (decl
&& DECL_NAME (decl
))
12485 if (template_class_depth (current_class_type
) == 0)
12487 decl
= check_explicit_specialization
12488 (unqualified_id
, decl
, template_count
,
12489 2 * funcdef_flag
+ 4);
12490 if (decl
== error_mark_node
)
12491 return error_mark_node
;
12494 decl
= do_friend (ctype
, unqualified_id
, decl
,
12500 return error_mark_node
;
12503 /* Structure field. It may not be a function, except for C++. */
12505 if (decl
== NULL_TREE
)
12509 /* C++ allows static class members. All other work
12510 for this is done by grokfield. */
12511 decl
= build_lang_decl_loc (loc
, VAR_DECL
,
12512 unqualified_id
, type
);
12513 set_linkage_for_static_data_member (decl
);
12515 error_at (declspecs
->locations
[ds_concept
],
12516 "static data member %qE declared %<concept%>",
12518 else if (constexpr_p
&& !initialized
)
12520 error ("%<constexpr%> static data member %qD must have an "
12521 "initializer", decl
);
12522 constexpr_p
= false;
12526 mark_inline_variable (decl
, declspecs
->locations
[ds_inline
]);
12528 if (!DECL_VAR_DECLARED_INLINE_P (decl
)
12529 && !(cxx_dialect
>= cxx17
&& constexpr_p
))
12530 /* Even if there is an in-class initialization, DECL
12531 is considered undefined until an out-of-class
12532 definition is provided, unless this is an inline
12534 DECL_EXTERNAL (decl
) = 1;
12538 CP_DECL_THREAD_LOCAL_P (decl
) = true;
12539 if (!processing_template_decl
)
12540 set_decl_tls_model (decl
, decl_default_tls_model (decl
));
12541 if (declspecs
->gnu_thread_keyword_p
)
12542 SET_DECL_GNU_TLS_P (decl
);
12548 error_at (declspecs
->locations
[ds_concept
],
12549 "non-static data member %qE declared %<concept%>",
12551 else if (constexpr_p
)
12553 error_at (declspecs
->locations
[ds_constexpr
],
12554 "non-static data member %qE declared %<constexpr%>",
12556 constexpr_p
= false;
12558 decl
= build_decl (loc
, FIELD_DECL
, unqualified_id
, type
);
12559 DECL_NONADDRESSABLE_P (decl
) = bitfield
;
12560 if (bitfield
&& !unqualified_id
)
12562 TREE_NO_WARNING (decl
) = 1;
12563 DECL_PADDING_P (decl
) = 1;
12566 if (storage_class
== sc_mutable
)
12568 DECL_MUTABLE_P (decl
) = 1;
12569 storage_class
= sc_none
;
12574 /* An attempt is being made to initialize a non-static
12575 member. This is new in C++11. */
12576 maybe_warn_cpp0x (CPP0X_NSDMI
);
12578 /* If this has been parsed with static storage class, but
12579 errors forced staticp to be cleared, ensure NSDMI is
12581 if (declspecs
->storage_class
== sc_static
)
12582 DECL_INITIAL (decl
) = error_mark_node
;
12586 bad_specifiers (decl
, BSP_FIELD
, virtualp
,
12587 memfn_quals
!= TYPE_UNQUALIFIED
,
12588 staticp
? false : inlinep
, friendp
,
12589 raises
!= NULL_TREE
,
12590 declspecs
->locations
);
12593 else if (TREE_CODE (type
) == FUNCTION_TYPE
12594 || TREE_CODE (type
) == METHOD_TYPE
)
12596 tree original_name
;
12599 if (!unqualified_id
)
12600 return error_mark_node
;
12602 if (TREE_CODE (unqualified_id
) == TEMPLATE_ID_EXPR
)
12603 original_name
= dname
;
12605 original_name
= unqualified_id
;
12606 // FIXME:gcc_assert (original_name == dname);
12608 if (storage_class
== sc_auto
)
12609 error ("storage class %<auto%> invalid for function %qs", name
);
12610 else if (storage_class
== sc_register
)
12611 error ("storage class %<register%> invalid for function %qs", name
);
12614 if (declspecs
->gnu_thread_keyword_p
)
12615 error_at (declspecs
->locations
[ds_thread
],
12616 "storage class %<__thread%> invalid for function %qs",
12619 error_at (declspecs
->locations
[ds_thread
],
12620 "storage class %<thread_local%> invalid for "
12621 "function %qs", name
);
12624 if (virt_specifiers
)
12625 error ("virt-specifiers in %qs not allowed outside a class "
12626 "definition", name
);
12627 /* Function declaration not at top level.
12628 Storage classes other than `extern' are not allowed
12629 and `extern' makes no difference. */
12630 if (! toplevel_bindings_p ()
12631 && (storage_class
== sc_static
12632 || decl_spec_seq_has_spec_p (declspecs
, ds_inline
))
12635 if (storage_class
== sc_static
)
12636 pedwarn (declspecs
->locations
[ds_storage_class
], OPT_Wpedantic
,
12637 "%<static%> specifier invalid for function %qs "
12638 "declared out of global scope", name
);
12640 pedwarn (declspecs
->locations
[ds_inline
], OPT_Wpedantic
,
12641 "%<inline%> specifier invalid for function %qs "
12642 "declared out of global scope", name
);
12645 if (ctype
== NULL_TREE
)
12649 error ("virtual non-class function %qs", name
);
12652 else if (sfk
== sfk_constructor
12653 || sfk
== sfk_destructor
)
12655 error (funcdef_flag
12656 ? G_("%qs defined in a non-class scope")
12657 : G_("%qs declared in a non-class scope"), name
);
12662 /* Record whether the function is public. */
12663 publicp
= (ctype
!= NULL_TREE
12664 || storage_class
!= sc_static
);
12666 decl
= grokfndecl (ctype
, type
, original_name
, parms
, unqualified_id
,
12668 reqs
, virtualp
, flags
, memfn_quals
, rqual
, raises
,
12671 inlinep
| (2 * constexpr_p
) | (4 * concept_p
),
12672 initialized
== SD_DELETED
,
12675 late_return_type_p
,
12676 template_count
, in_namespace
, attrlist
,
12677 declarator
->id_loc
);
12678 if (decl
== NULL_TREE
)
12679 return error_mark_node
;
12681 if (explicitp
== 2)
12682 DECL_NONCONVERTING_P (decl
) = 1;
12685 int invalid_static
= 0;
12687 /* Don't allow a static member function in a class, and forbid
12688 declaring main to be static. */
12689 if (TREE_CODE (type
) == METHOD_TYPE
)
12691 permerror (input_location
, "cannot declare member function %qD to have "
12692 "static linkage", decl
);
12693 invalid_static
= 1;
12695 else if (current_function_decl
)
12697 /* 7.1.1: There can be no static function declarations within a
12699 error_at (declspecs
->locations
[ds_storage_class
],
12700 "cannot declare static function inside another function");
12701 invalid_static
= 1;
12704 if (invalid_static
)
12707 storage_class
= sc_none
;
12713 /* It's a variable. */
12715 /* An uninitialized decl with `extern' is a reference. */
12716 decl
= grokvardecl (type
, dname
, unqualified_id
,
12723 ctype
? ctype
: in_namespace
,
12725 if (decl
== NULL_TREE
)
12726 return error_mark_node
;
12728 bad_specifiers (decl
, BSP_VAR
, virtualp
,
12729 memfn_quals
!= TYPE_UNQUALIFIED
,
12730 inlinep
, friendp
, raises
!= NULL_TREE
,
12731 declspecs
->locations
);
12735 DECL_CONTEXT (decl
) = ctype
;
12738 permerror (declspecs
->locations
[ds_storage_class
],
12739 "%<static%> may not be used when defining "
12740 "(as opposed to declaring) a static data member");
12742 storage_class
= sc_none
;
12744 if (storage_class
== sc_register
&& TREE_STATIC (decl
))
12746 error ("static member %qD declared %<register%>", decl
);
12747 storage_class
= sc_none
;
12749 if (storage_class
== sc_extern
&& pedantic
)
12751 pedwarn (input_location
, OPT_Wpedantic
,
12752 "cannot explicitly declare member %q#D to have "
12753 "extern linkage", decl
);
12754 storage_class
= sc_none
;
12757 else if (constexpr_p
&& DECL_EXTERNAL (decl
))
12759 error ("declaration of %<constexpr%> variable %qD "
12760 "is not a definition", decl
);
12761 constexpr_p
= false;
12765 mark_inline_variable (decl
, declspecs
->locations
[ds_inline
]);
12766 if (innermost_code
== cdk_decomp
)
12768 gcc_assert (declarator
&& declarator
->kind
== cdk_decomp
);
12769 DECL_SOURCE_LOCATION (decl
) = declarator
->id_loc
;
12770 DECL_ARTIFICIAL (decl
) = 1;
12771 fit_decomposition_lang_decl (decl
, NULL_TREE
);
12775 if (VAR_P (decl
) && !initialized
)
12776 if (tree auto_node
= type_uses_auto (type
))
12777 if (!CLASS_PLACEHOLDER_TEMPLATE (auto_node
))
12779 location_t loc
= declspecs
->locations
[ds_type_spec
];
12780 error_at (loc
, "declaration of %q#D has no initializer", decl
);
12781 TREE_TYPE (decl
) = error_mark_node
;
12784 if (storage_class
== sc_extern
&& initialized
&& !funcdef_flag
)
12786 if (toplevel_bindings_p ())
12788 /* It's common practice (and completely valid) to have a const
12789 be initialized and declared extern. */
12790 if (!(type_quals
& TYPE_QUAL_CONST
))
12791 warning (0, "%qs initialized and declared %<extern%>", name
);
12795 error ("%qs has both %<extern%> and initializer", name
);
12796 return error_mark_node
;
12800 /* Record `register' declaration for warnings on &
12801 and in case doing stupid register allocation. */
12803 if (storage_class
== sc_register
)
12805 DECL_REGISTER (decl
) = 1;
12806 /* Warn about register storage specifiers on PARM_DECLs. */
12807 if (TREE_CODE (decl
) == PARM_DECL
)
12809 if (cxx_dialect
>= cxx17
)
12810 pedwarn (DECL_SOURCE_LOCATION (decl
), OPT_Wregister
,
12811 "ISO C++17 does not allow %<register%> storage "
12812 "class specifier");
12814 warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wregister
,
12815 "%<register%> storage class specifier used");
12818 else if (storage_class
== sc_extern
)
12819 DECL_THIS_EXTERN (decl
) = 1;
12820 else if (storage_class
== sc_static
)
12821 DECL_THIS_STATIC (decl
) = 1;
12823 /* Set constexpr flag on vars (functions got it in grokfndecl). */
12824 if (constexpr_p
&& VAR_P (decl
))
12825 DECL_DECLARED_CONSTEXPR_P (decl
) = true;
12827 /* Record constancy and volatility on the DECL itself . There's
12828 no need to do this when processing a template; we'll do this
12829 for the instantiated declaration based on the type of DECL. */
12830 if (!processing_template_decl
)
12831 cp_apply_type_quals_to_decl (type_quals
, decl
);
12837 /* Subroutine of start_function. Ensure that each of the parameter
12838 types (as listed in PARMS) is complete, as is required for a
12839 function definition. */
12842 require_complete_types_for_parms (tree parms
)
12844 for (; parms
; parms
= DECL_CHAIN (parms
))
12846 if (dependent_type_p (TREE_TYPE (parms
)))
12848 if (!VOID_TYPE_P (TREE_TYPE (parms
))
12849 && complete_type_or_else (TREE_TYPE (parms
), parms
))
12851 relayout_decl (parms
);
12852 DECL_ARG_TYPE (parms
) = type_passed_as (TREE_TYPE (parms
));
12854 maybe_warn_parm_abi (TREE_TYPE (parms
),
12855 DECL_SOURCE_LOCATION (parms
));
12858 /* grokparms or complete_type_or_else will have already issued
12860 TREE_TYPE (parms
) = error_mark_node
;
12864 /* Returns nonzero if T is a local variable. */
12867 local_variable_p (const_tree t
)
12870 /* A VAR_DECL with a context that is a _TYPE is a static data
12872 && !TYPE_P (CP_DECL_CONTEXT (t
))
12873 /* Any other non-local variable must be at namespace scope. */
12874 && !DECL_NAMESPACE_SCOPE_P (t
))
12875 || (TREE_CODE (t
) == PARM_DECL
))
12881 /* Like local_variable_p, but suitable for use as a tree-walking
12885 local_variable_p_walkfn (tree
*tp
, int *walk_subtrees
,
12888 if (local_variable_p (*tp
)
12889 && (!DECL_ARTIFICIAL (*tp
) || DECL_NAME (*tp
) == this_identifier
))
12891 else if (TYPE_P (*tp
))
12892 *walk_subtrees
= 0;
12897 /* Check that ARG, which is a default-argument expression for a
12898 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
12899 something goes wrong. DECL may also be a _TYPE node, rather than a
12900 DECL, if there is no DECL available. */
12903 check_default_argument (tree decl
, tree arg
, tsubst_flags_t complain
)
12908 if (TREE_CODE (arg
) == DEFAULT_ARG
)
12909 /* We get a DEFAULT_ARG when looking at an in-class declaration
12910 with a default argument. Ignore the argument for now; we'll
12911 deal with it after the class is complete. */
12920 decl_type
= TREE_TYPE (decl
);
12922 if (arg
== error_mark_node
12923 || decl
== error_mark_node
12924 || TREE_TYPE (arg
) == error_mark_node
12925 || decl_type
== error_mark_node
)
12926 /* Something already went wrong. There's no need to check
12928 return error_mark_node
;
12930 /* [dcl.fct.default]
12932 A default argument expression is implicitly converted to the
12934 ++cp_unevaluated_operand
;
12935 /* Avoid digest_init clobbering the initializer. */
12936 tree carg
= BRACE_ENCLOSED_INITIALIZER_P (arg
) ? unshare_expr (arg
): arg
;
12937 perform_implicit_conversion_flags (decl_type
, carg
, complain
,
12939 --cp_unevaluated_operand
;
12941 /* Avoid redundant -Wzero-as-null-pointer-constant warnings at
12943 if (TYPE_PTR_OR_PTRMEM_P (decl_type
)
12944 && null_ptr_cst_p (arg
))
12945 return nullptr_node
;
12947 /* [dcl.fct.default]
12949 Local variables shall not be used in default argument
12952 The keyword `this' shall not be used in a default argument of a
12953 member function. */
12954 var
= cp_walk_tree_without_duplicates (&arg
, local_variable_p_walkfn
, NULL
);
12957 if (complain
& tf_warning_or_error
)
12959 if (DECL_NAME (var
) == this_identifier
)
12960 permerror (input_location
, "default argument %qE uses %qD",
12963 error ("default argument %qE uses local variable %qD", arg
, var
);
12965 return error_mark_node
;
12972 /* Returns a deprecated type used within TYPE, or NULL_TREE if none. */
12975 type_is_deprecated (tree type
)
12977 enum tree_code code
;
12978 if (TREE_DEPRECATED (type
))
12980 if (TYPE_NAME (type
))
12982 if (TREE_DEPRECATED (TYPE_NAME (type
)))
12988 /* Do warn about using typedefs to a deprecated class. */
12989 if (OVERLOAD_TYPE_P (type
) && type
!= TYPE_MAIN_VARIANT (type
))
12990 return type_is_deprecated (TYPE_MAIN_VARIANT (type
));
12992 code
= TREE_CODE (type
);
12994 if (code
== POINTER_TYPE
|| code
== REFERENCE_TYPE
12995 || code
== OFFSET_TYPE
|| code
== FUNCTION_TYPE
12996 || code
== METHOD_TYPE
|| code
== ARRAY_TYPE
)
12997 return type_is_deprecated (TREE_TYPE (type
));
12999 if (TYPE_PTRMEMFUNC_P (type
))
13000 return type_is_deprecated
13001 (TREE_TYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (type
))));
13006 /* Decode the list of parameter types for a function type.
13007 Given the list of things declared inside the parens,
13008 return a list of types.
13010 If this parameter does not end with an ellipsis, we append
13013 *PARMS is set to the chain of PARM_DECLs created. */
13016 grokparms (tree parmlist
, tree
*parms
)
13018 tree result
= NULL_TREE
;
13019 tree decls
= NULL_TREE
;
13023 for (parm
= parmlist
; parm
!= NULL_TREE
; parm
= TREE_CHAIN (parm
))
13025 tree type
= NULL_TREE
;
13026 tree init
= TREE_PURPOSE (parm
);
13027 tree decl
= TREE_VALUE (parm
);
13029 if (parm
== void_list_node
)
13032 if (! decl
|| TREE_TYPE (decl
) == error_mark_node
)
13035 type
= TREE_TYPE (decl
);
13036 if (VOID_TYPE_P (type
))
13038 if (same_type_p (type
, void_type_node
)
13040 && !DECL_NAME (decl
) && !result
13041 && TREE_CHAIN (parm
) == void_list_node
)
13042 /* DR 577: A parameter list consisting of a single
13043 unnamed parameter of non-dependent type 'void'. */
13045 else if (cv_qualified_p (type
))
13046 error_at (DECL_SOURCE_LOCATION (decl
),
13047 "invalid use of cv-qualified type %qT in "
13048 "parameter declaration", type
);
13050 error_at (DECL_SOURCE_LOCATION (decl
),
13051 "invalid use of type %<void%> in parameter "
13053 /* It's not a good idea to actually create parameters of
13054 type `void'; other parts of the compiler assume that a
13055 void type terminates the parameter list. */
13056 type
= error_mark_node
;
13057 TREE_TYPE (decl
) = error_mark_node
;
13060 if (type
!= error_mark_node
)
13062 if (deprecated_state
!= DEPRECATED_SUPPRESS
)
13064 tree deptype
= type_is_deprecated (type
);
13066 cp_warn_deprecated_use (deptype
);
13069 /* Top-level qualifiers on the parameters are
13070 ignored for function types. */
13071 type
= cp_build_qualified_type (type
, 0);
13072 if (TREE_CODE (type
) == METHOD_TYPE
)
13074 error ("parameter %qD invalidly declared method type", decl
);
13075 type
= build_pointer_type (type
);
13076 TREE_TYPE (decl
) = type
;
13078 else if (abstract_virtuals_error (decl
, type
))
13079 any_error
= 1; /* Seems like a good idea. */
13080 else if (cxx_dialect
< cxx17
&& INDIRECT_TYPE_P (type
))
13082 /* Before C++17 DR 393:
13083 [dcl.fct]/6, parameter types cannot contain pointers
13084 (references) to arrays of unknown bound. */
13085 tree t
= TREE_TYPE (type
);
13086 int ptr
= TYPE_PTR_P (type
);
13090 if (TYPE_PTR_P (t
))
13092 else if (TREE_CODE (t
) != ARRAY_TYPE
)
13094 else if (!TYPE_DOMAIN (t
))
13098 if (TREE_CODE (t
) == ARRAY_TYPE
)
13099 pedwarn (DECL_SOURCE_LOCATION (decl
), OPT_Wpedantic
,
13101 ? G_("parameter %qD includes pointer to array of "
13102 "unknown bound %qT")
13103 : G_("parameter %qD includes reference to array of "
13104 "unknown bound %qT"),
13110 else if (init
&& !processing_template_decl
)
13111 init
= check_default_argument (decl
, init
, tf_warning_or_error
);
13114 DECL_CHAIN (decl
) = decls
;
13116 result
= tree_cons (init
, type
, result
);
13118 decls
= nreverse (decls
);
13119 result
= nreverse (result
);
13121 result
= chainon (result
, void_list_node
);
13128 /* D is a constructor or overloaded `operator='.
13130 Let T be the class in which D is declared. Then, this function
13133 -1 if D's is an ill-formed constructor or copy assignment operator
13134 whose first parameter is of type `T'.
13135 0 if D is not a copy constructor or copy assignment
13137 1 if D is a copy constructor or copy assignment operator whose
13138 first parameter is a reference to non-const qualified T.
13139 2 if D is a copy constructor or copy assignment operator whose
13140 first parameter is a reference to const qualified T.
13142 This function can be used as a predicate. Positive values indicate
13143 a copy constructor and nonzero values indicate a copy assignment
13147 copy_fn_p (const_tree d
)
13153 gcc_assert (DECL_FUNCTION_MEMBER_P (d
));
13155 if (TREE_CODE (d
) == TEMPLATE_DECL
13156 || (DECL_TEMPLATE_INFO (d
)
13157 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d
))))
13158 /* Instantiations of template member functions are never copy
13159 functions. Note that member functions of templated classes are
13160 represented as template functions internally, and we must
13161 accept those as copy functions. */
13164 args
= FUNCTION_FIRST_USER_PARMTYPE (d
);
13168 arg_type
= TREE_VALUE (args
);
13169 if (arg_type
== error_mark_node
)
13172 if (TYPE_MAIN_VARIANT (arg_type
) == DECL_CONTEXT (d
))
13174 /* Pass by value copy assignment operator. */
13177 else if (TYPE_REF_P (arg_type
)
13178 && !TYPE_REF_IS_RVALUE (arg_type
)
13179 && TYPE_MAIN_VARIANT (TREE_TYPE (arg_type
)) == DECL_CONTEXT (d
))
13181 if (CP_TYPE_CONST_P (TREE_TYPE (arg_type
)))
13187 args
= TREE_CHAIN (args
);
13189 if (args
&& args
!= void_list_node
&& !TREE_PURPOSE (args
))
13190 /* There are more non-optional args. */
13196 /* D is a constructor or overloaded `operator='.
13198 Let T be the class in which D is declared. Then, this function
13199 returns true when D is a move constructor or move assignment
13200 operator, false otherwise. */
13203 move_fn_p (const_tree d
)
13205 gcc_assert (DECL_FUNCTION_MEMBER_P (d
));
13207 if (cxx_dialect
== cxx98
)
13208 /* There are no move constructors if we are in C++98 mode. */
13211 if (TREE_CODE (d
) == TEMPLATE_DECL
13212 || (DECL_TEMPLATE_INFO (d
)
13213 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d
))))
13214 /* Instantiations of template member functions are never move
13215 functions. Note that member functions of templated classes are
13216 represented as template functions internally, and we must
13217 accept those as move functions. */
13220 return move_signature_fn_p (d
);
13223 /* D is a constructor or overloaded `operator='.
13225 Then, this function returns true when D has the same signature as a move
13226 constructor or move assignment operator (because either it is such a
13227 ctor/op= or it is a template specialization with the same signature),
13228 false otherwise. */
13231 move_signature_fn_p (const_tree d
)
13235 bool result
= false;
13237 args
= FUNCTION_FIRST_USER_PARMTYPE (d
);
13241 arg_type
= TREE_VALUE (args
);
13242 if (arg_type
== error_mark_node
)
13245 if (TYPE_REF_P (arg_type
)
13246 && TYPE_REF_IS_RVALUE (arg_type
)
13247 && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (arg_type
)),
13251 args
= TREE_CHAIN (args
);
13253 if (args
&& args
!= void_list_node
&& !TREE_PURPOSE (args
))
13254 /* There are more non-optional args. */
13260 /* Remember any special properties of member function DECL. */
13263 grok_special_member_properties (tree decl
)
13267 if (!DECL_NONSTATIC_MEMBER_FUNCTION_P (decl
))
13270 class_type
= DECL_CONTEXT (decl
);
13271 if (IDENTIFIER_CTOR_P (DECL_NAME (decl
)))
13273 int ctor
= copy_fn_p (decl
);
13275 if (!DECL_ARTIFICIAL (decl
))
13276 TYPE_HAS_USER_CONSTRUCTOR (class_type
) = 1;
13282 A non-template constructor for class X is a copy
13283 constructor if its first parameter is of type X&, const
13284 X&, volatile X& or const volatile X&, and either there
13285 are no other parameters or else all other parameters have
13286 default arguments. */
13287 TYPE_HAS_COPY_CTOR (class_type
) = 1;
13288 if (user_provided_p (decl
))
13289 TYPE_HAS_COMPLEX_COPY_CTOR (class_type
) = 1;
13291 TYPE_HAS_CONST_COPY_CTOR (class_type
) = 1;
13293 else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl
)))
13294 TYPE_HAS_DEFAULT_CONSTRUCTOR (class_type
) = 1;
13295 else if (move_fn_p (decl
) && user_provided_p (decl
))
13296 TYPE_HAS_COMPLEX_MOVE_CTOR (class_type
) = 1;
13297 else if (is_list_ctor (decl
))
13298 TYPE_HAS_LIST_CTOR (class_type
) = 1;
13300 if (DECL_DECLARED_CONSTEXPR_P (decl
)
13301 && !ctor
&& !move_fn_p (decl
))
13302 TYPE_HAS_CONSTEXPR_CTOR (class_type
) = 1;
13304 else if (DECL_NAME (decl
) == assign_op_identifier
)
13308 A non-template assignment operator for class X is a copy
13309 assignment operator if its parameter is of type X, X&, const
13310 X&, volatile X& or const volatile X&. */
13312 int assop
= copy_fn_p (decl
);
13316 TYPE_HAS_COPY_ASSIGN (class_type
) = 1;
13317 if (user_provided_p (decl
))
13318 TYPE_HAS_COMPLEX_COPY_ASSIGN (class_type
) = 1;
13320 TYPE_HAS_CONST_COPY_ASSIGN (class_type
) = 1;
13322 else if (move_fn_p (decl
) && user_provided_p (decl
))
13323 TYPE_HAS_COMPLEX_MOVE_ASSIGN (class_type
) = 1;
13325 else if (IDENTIFIER_CONV_OP_P (DECL_NAME (decl
)))
13326 TYPE_HAS_CONVERSION (class_type
) = true;
13328 /* Destructors are handled in check_methods. */
13331 /* Check a constructor DECL has the correct form. Complains
13332 if the class has a constructor of the form X(X). */
13335 grok_ctor_properties (const_tree ctype
, const_tree decl
)
13337 int ctor_parm
= copy_fn_p (decl
);
13343 A declaration of a constructor for a class X is ill-formed if
13344 its first parameter is of type (optionally cv-qualified) X
13345 and either there are no other parameters or else all other
13346 parameters have default arguments.
13348 We *don't* complain about member template instantiations that
13349 have this form, though; they can occur as we try to decide
13350 what constructor to use during overload resolution. Since
13351 overload resolution will never prefer such a constructor to
13352 the non-template copy constructor (which is either explicitly
13353 or implicitly defined), there's no need to worry about their
13354 existence. Theoretically, they should never even be
13355 instantiated, but that's hard to forestall. */
13356 error ("invalid constructor; you probably meant %<%T (const %T&)%>",
13364 /* DECL is a declaration for an overloaded or conversion operator. If
13365 COMPLAIN is true, errors are issued for invalid declarations. */
13368 grok_op_properties (tree decl
, bool complain
)
13370 tree argtypes
= TYPE_ARG_TYPES (TREE_TYPE (decl
));
13371 bool methodp
= TREE_CODE (TREE_TYPE (decl
)) == METHOD_TYPE
;
13372 tree name
= DECL_NAME (decl
);
13373 location_t loc
= DECL_SOURCE_LOCATION (decl
);
13375 tree class_type
= DECL_CONTEXT (decl
);
13376 if (class_type
&& !CLASS_TYPE_P (class_type
))
13377 class_type
= NULL_TREE
;
13379 tree_code operator_code
;
13381 if (IDENTIFIER_CONV_OP_P (name
))
13383 /* Conversion operators are TYPE_EXPR for the purposes of this
13385 operator_code
= TYPE_EXPR
;
13386 op_flags
= OVL_OP_FLAG_UNARY
;
13390 const ovl_op_info_t
*ovl_op
= IDENTIFIER_OVL_OP_INFO (name
);
13392 operator_code
= ovl_op
->tree_code
;
13393 op_flags
= ovl_op
->flags
;
13394 gcc_checking_assert (operator_code
!= ERROR_MARK
);
13395 DECL_OVERLOADED_OPERATOR_CODE_RAW (decl
) = ovl_op
->ovl_op_code
;
13398 if (op_flags
& OVL_OP_FLAG_ALLOC
)
13400 /* operator new and operator delete are quite special. */
13404 case OVL_OP_FLAG_ALLOC
:
13405 TYPE_HAS_NEW_OPERATOR (class_type
) = 1;
13408 case OVL_OP_FLAG_ALLOC
| OVL_OP_FLAG_DELETE
:
13409 TYPE_GETS_DELETE (class_type
) |= 1;
13412 case OVL_OP_FLAG_ALLOC
| OVL_OP_FLAG_VEC
:
13413 TYPE_HAS_ARRAY_NEW_OPERATOR (class_type
) = 1;
13416 case OVL_OP_FLAG_ALLOC
| OVL_OP_FLAG_DELETE
| OVL_OP_FLAG_VEC
:
13417 TYPE_GETS_DELETE (class_type
) |= 2;
13421 gcc_unreachable ();
13424 /* [basic.std.dynamic.allocation]/1:
13426 A program is ill-formed if an allocation function is declared
13427 in a namespace scope other than global scope or declared
13428 static in global scope.
13430 The same also holds true for deallocation functions. */
13431 if (DECL_NAMESPACE_SCOPE_P (decl
))
13433 if (CP_DECL_CONTEXT (decl
) != global_namespace
)
13435 error_at (loc
, "%qD may not be declared within a namespace",
13440 if (!TREE_PUBLIC (decl
))
13442 error_at (loc
, "%qD may not be declared as static", decl
);
13447 if (op_flags
& OVL_OP_FLAG_DELETE
)
13448 coerce_delete_type (decl
, loc
);
13451 DECL_IS_OPERATOR_NEW (decl
) = 1;
13452 TREE_TYPE (decl
) = coerce_new_type (TREE_TYPE (decl
), loc
);
13458 /* An operator function must either be a non-static member function
13459 or have at least one parameter of a class, a reference to a class,
13460 an enumeration, or a reference to an enumeration. 13.4.0.6 */
13461 if (! methodp
|| DECL_STATIC_FUNCTION_P (decl
))
13463 if (operator_code
== TYPE_EXPR
13464 || operator_code
== CALL_EXPR
13465 || operator_code
== COMPONENT_REF
13466 || operator_code
== ARRAY_REF
13467 || operator_code
== NOP_EXPR
)
13469 error_at (loc
, "%qD must be a nonstatic member function", decl
);
13473 if (DECL_STATIC_FUNCTION_P (decl
))
13475 error_at (loc
, "%qD must be either a non-static member "
13476 "function or a non-member function", decl
);
13480 for (tree arg
= argtypes
; ; arg
= TREE_CHAIN (arg
))
13482 if (!arg
|| arg
== void_list_node
)
13485 error_at(loc
, "%qD must have an argument of class or "
13486 "enumerated type", decl
);
13490 tree type
= non_reference (TREE_VALUE (arg
));
13491 if (type
== error_mark_node
)
13494 /* MAYBE_CLASS_TYPE_P, rather than CLASS_TYPE_P, is used
13495 because these checks are performed even on template
13497 if (MAYBE_CLASS_TYPE_P (type
)
13498 || TREE_CODE (type
) == ENUMERAL_TYPE
)
13503 if (operator_code
== CALL_EXPR
)
13504 /* There are no further restrictions on the arguments to an overloaded
13508 if (operator_code
== COND_EXPR
)
13511 error_at (loc
, "ISO C++ prohibits overloading operator ?:");
13515 /* Count the number of arguments and check for ellipsis. */
13517 for (tree arg
= argtypes
; arg
!= void_list_node
; arg
= TREE_CHAIN (arg
))
13522 error_at (loc
, "%qD must not have variable number of arguments",
13529 /* Verify correct number of arguments. */
13532 case OVL_OP_FLAG_AMBIARY
:
13535 /* We have a unary instance of an ambi-ary op. Remap to the
13537 unsigned alt
= ovl_op_alternate
[ovl_op_mapping
[operator_code
]];
13538 const ovl_op_info_t
*ovl_op
= &ovl_op_info
[false][alt
];
13539 gcc_checking_assert (ovl_op
->flags
== OVL_OP_FLAG_UNARY
);
13540 operator_code
= ovl_op
->tree_code
;
13541 DECL_OVERLOADED_OPERATOR_CODE_RAW (decl
) = ovl_op
->ovl_op_code
;
13543 else if (arity
!= 2)
13545 /* This was an ambiguous operator but is invalid. */
13548 ? G_("%qD must have either zero or one argument")
13549 : G_("%qD must have either one or two arguments"), decl
);
13552 else if ((operator_code
== POSTINCREMENT_EXPR
13553 || operator_code
== POSTDECREMENT_EXPR
)
13554 && ! processing_template_decl
13555 /* x++ and x--'s second argument must be an int. */
13556 && ! same_type_p (TREE_VALUE (TREE_CHAIN (argtypes
)),
13557 integer_type_node
))
13561 ? G_("postfix %qD must have %<int%> as its argument")
13562 : G_("postfix %qD must have %<int%> as its second argument"),
13568 case OVL_OP_FLAG_UNARY
:
13573 ? G_("%qD must have no arguments")
13574 : G_("%qD must have exactly one argument"), decl
);
13579 case OVL_OP_FLAG_BINARY
:
13584 ? G_("%qD must have exactly one argument")
13585 : G_("%qD must have exactly two arguments"), decl
);
13591 gcc_unreachable ();
13594 /* There can be no default arguments. */
13595 for (tree arg
= argtypes
; arg
!= void_list_node
; arg
= TREE_CHAIN (arg
))
13596 if (TREE_PURPOSE (arg
))
13598 TREE_PURPOSE (arg
) = NULL_TREE
;
13599 error_at (loc
, "%qD cannot have default arguments", decl
);
13603 /* At this point the declaration is well-formed. It may not be
13604 sensible though. */
13606 /* Check member function warnings only on the in-class declaration.
13607 There's no point warning on an out-of-class definition. */
13608 if (class_type
&& class_type
!= current_class_type
)
13611 /* Warn about conversion operators that will never be used. */
13612 if (IDENTIFIER_CONV_OP_P (name
)
13613 && ! DECL_TEMPLATE_INFO (decl
)
13614 && warn_class_conversion
)
13616 tree t
= TREE_TYPE (name
);
13617 int ref
= TYPE_REF_P (t
);
13620 t
= TYPE_MAIN_VARIANT (TREE_TYPE (t
));
13622 if (VOID_TYPE_P (t
))
13623 warning_at (loc
, OPT_Wclass_conversion
, "converting %qT to %<void%> "
13624 "will never use a type conversion operator", class_type
);
13625 else if (class_type
)
13627 if (same_type_ignoring_top_level_qualifiers_p (t
, class_type
))
13628 warning_at (loc
, OPT_Wclass_conversion
,
13630 ? G_("converting %qT to a reference to the same type "
13631 "will never use a type conversion operator")
13632 : G_("converting %qT to the same type "
13633 "will never use a type conversion operator"),
13635 /* Don't force t to be complete here. */
13636 else if (MAYBE_CLASS_TYPE_P (t
)
13637 && COMPLETE_TYPE_P (t
)
13638 && DERIVED_FROM_P (t
, class_type
))
13639 warning_at (loc
, OPT_Wclass_conversion
,
13641 ? G_("converting %qT to a reference to a base class "
13642 "%qT will never use a type conversion operator")
13643 : G_("converting %qT to a base class %qT "
13644 "will never use a type conversion operator"),
13652 /* Effective C++ rules below. */
13654 /* More Effective C++ rule 7. */
13655 if (operator_code
== TRUTH_ANDIF_EXPR
13656 || operator_code
== TRUTH_ORIF_EXPR
13657 || operator_code
== COMPOUND_EXPR
)
13658 warning_at (loc
, OPT_Weffc__
,
13659 "user-defined %qD always evaluates both arguments", decl
);
13661 /* More Effective C++ rule 6. */
13662 if (operator_code
== POSTINCREMENT_EXPR
13663 || operator_code
== POSTDECREMENT_EXPR
13664 || operator_code
== PREINCREMENT_EXPR
13665 || operator_code
== PREDECREMENT_EXPR
)
13667 tree arg
= TREE_VALUE (argtypes
);
13668 tree ret
= TREE_TYPE (TREE_TYPE (decl
));
13669 if (methodp
|| TYPE_REF_P (arg
))
13670 arg
= TREE_TYPE (arg
);
13671 arg
= TYPE_MAIN_VARIANT (arg
);
13673 if (operator_code
== PREINCREMENT_EXPR
13674 || operator_code
== PREDECREMENT_EXPR
)
13676 if (!TYPE_REF_P (ret
)
13677 || !same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (ret
)), arg
))
13678 warning_at (loc
, OPT_Weffc__
, "prefix %qD should return %qT", decl
,
13679 build_reference_type (arg
));
13683 if (!same_type_p (TYPE_MAIN_VARIANT (ret
), arg
))
13684 warning_at (loc
, OPT_Weffc__
,
13685 "postfix %qD should return %qT", decl
, arg
);
13689 /* Effective C++ rule 23. */
13690 if (!DECL_ASSIGNMENT_OPERATOR_P (decl
)
13691 && (operator_code
== PLUS_EXPR
13692 || operator_code
== MINUS_EXPR
13693 || operator_code
== TRUNC_DIV_EXPR
13694 || operator_code
== MULT_EXPR
13695 || operator_code
== TRUNC_MOD_EXPR
)
13696 && TYPE_REF_P (TREE_TYPE (TREE_TYPE (decl
))))
13697 warning_at (loc
, OPT_Weffc__
, "%qD should return by value", decl
);
13702 /* Return a string giving the keyword associate with CODE. */
13704 static const char *
13705 tag_name (enum tag_types code
)
13717 case typename_type
:
13720 gcc_unreachable ();
13724 /* Name lookup in an elaborated-type-specifier (after the keyword
13725 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
13726 elaborated-type-specifier is invalid, issue a diagnostic and return
13727 error_mark_node; otherwise, return the *_TYPE to which it referred.
13728 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
13731 check_elaborated_type_specifier (enum tag_types tag_code
,
13733 bool allow_template_p
)
13739 struct S { struct S *p; };
13741 name lookup will find the TYPE_DECL for the implicit "S::S"
13742 typedef. Adjust for that here. */
13743 if (DECL_SELF_REFERENCE_P (decl
))
13744 decl
= TYPE_NAME (TREE_TYPE (decl
));
13746 type
= TREE_TYPE (decl
);
13748 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
13749 is false for this case as well. */
13750 if (TREE_CODE (type
) == TEMPLATE_TYPE_PARM
)
13752 error ("using template type parameter %qT after %qs",
13753 type
, tag_name (tag_code
));
13754 return error_mark_node
;
13756 /* Accept template template parameters. */
13757 else if (allow_template_p
13758 && (TREE_CODE (type
) == BOUND_TEMPLATE_TEMPLATE_PARM
13759 || TREE_CODE (type
) == TEMPLATE_TEMPLATE_PARM
))
13763 If the identifier resolves to a typedef-name or the
13764 simple-template-id resolves to an alias template
13765 specialization, the elaborated-type-specifier is ill-formed.
13767 In other words, the only legitimate declaration to use in the
13768 elaborated type specifier is the implicit typedef created when
13769 the type is declared. */
13770 else if (!DECL_IMPLICIT_TYPEDEF_P (decl
)
13771 && !DECL_SELF_REFERENCE_P (decl
)
13772 && tag_code
!= typename_type
)
13774 if (alias_template_specialization_p (type
))
13775 error ("using alias template specialization %qT after %qs",
13776 type
, tag_name (tag_code
));
13778 error ("using typedef-name %qD after %qs", decl
, tag_name (tag_code
));
13779 inform (DECL_SOURCE_LOCATION (decl
),
13780 "%qD has a previous declaration here", decl
);
13781 return error_mark_node
;
13783 else if (TREE_CODE (type
) != RECORD_TYPE
13784 && TREE_CODE (type
) != UNION_TYPE
13785 && tag_code
!= enum_type
13786 && tag_code
!= typename_type
)
13788 error ("%qT referred to as %qs", type
, tag_name (tag_code
));
13789 inform (location_of (type
), "%qT has a previous declaration here", type
);
13790 return error_mark_node
;
13792 else if (TREE_CODE (type
) != ENUMERAL_TYPE
13793 && tag_code
== enum_type
)
13795 error ("%qT referred to as enum", type
);
13796 inform (location_of (type
), "%qT has a previous declaration here", type
);
13797 return error_mark_node
;
13799 else if (!allow_template_p
13800 && TREE_CODE (type
) == RECORD_TYPE
13801 && CLASSTYPE_IS_TEMPLATE (type
))
13803 /* If a class template appears as elaborated type specifier
13804 without a template header such as:
13806 template <class T> class C {};
13807 void f(class C); // No template header here
13809 then the required template argument is missing. */
13810 error ("template argument required for %<%s %T%>",
13811 tag_name (tag_code
),
13812 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type
)));
13813 return error_mark_node
;
13819 /* Lookup NAME in elaborate type specifier in scope according to
13820 SCOPE and issue diagnostics if necessary.
13821 Return *_TYPE node upon success, NULL_TREE when the NAME is not
13822 found, and ERROR_MARK_NODE for type error. */
13825 lookup_and_check_tag (enum tag_types tag_code
, tree name
,
13826 tag_scope scope
, bool template_header_p
)
13830 if (scope
== ts_global
)
13832 /* First try ordinary name lookup, ignoring hidden class name
13833 injected via friend declaration. */
13834 decl
= lookup_name_prefer_type (name
, 2);
13835 decl
= strip_using_decl (decl
);
13836 /* If that fails, the name will be placed in the smallest
13837 non-class, non-function-prototype scope according to 3.3.1/5.
13838 We may already have a hidden name declared as friend in this
13839 scope. So lookup again but not ignoring hidden names.
13840 If we find one, that name will be made visible rather than
13841 creating a new tag. */
13843 decl
= lookup_type_scope (name
, ts_within_enclosing_non_class
);
13846 decl
= lookup_type_scope (name
, scope
);
13849 && (DECL_CLASS_TEMPLATE_P (decl
)
13850 /* If scope is ts_current we're defining a class, so ignore a
13851 template template parameter. */
13852 || (scope
!= ts_current
13853 && DECL_TEMPLATE_TEMPLATE_PARM_P (decl
))))
13854 decl
= DECL_TEMPLATE_RESULT (decl
);
13856 if (decl
&& TREE_CODE (decl
) == TYPE_DECL
)
13858 /* Look for invalid nested type:
13862 if (scope
== ts_current
&& DECL_SELF_REFERENCE_P (decl
))
13864 error ("%qD has the same name as the class in which it is "
13867 return error_mark_node
;
13870 /* Two cases we need to consider when deciding if a class
13871 template is allowed as an elaborated type specifier:
13872 1. It is a self reference to its own class.
13873 2. It comes with a template header.
13877 template <class T> class C {
13878 class C *c1; // DECL_SELF_REFERENCE_P is true
13881 template <class U> class C; // template_header_p is true
13882 template <class T> class C<T>::D {
13883 class C *c2; // DECL_SELF_REFERENCE_P is true
13886 t
= check_elaborated_type_specifier (tag_code
,
13889 | DECL_SELF_REFERENCE_P (decl
));
13890 if (template_header_p
&& t
&& CLASS_TYPE_P (t
)
13891 && (!CLASSTYPE_TEMPLATE_INFO (t
)
13892 || (!PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (t
)))))
13894 error ("%qT is not a template", t
);
13895 inform (location_of (t
), "previous declaration here");
13896 if (TYPE_CLASS_SCOPE_P (t
)
13897 && CLASSTYPE_TEMPLATE_INFO (TYPE_CONTEXT (t
)))
13898 inform (input_location
,
13899 "perhaps you want to explicitly add %<%T::%>",
13901 t
= error_mark_node
;
13906 else if (decl
&& TREE_CODE (decl
) == TREE_LIST
)
13908 error ("reference to %qD is ambiguous", name
);
13909 print_candidates (decl
);
13910 return error_mark_node
;
13916 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
13917 Define the tag as a forward-reference if it is not defined.
13919 If a declaration is given, process it here, and report an error if
13920 multiple declarations are not identical.
13922 SCOPE is TS_CURRENT when this is also a definition. Only look in
13923 the current frame for the name (since C++ allows new names in any
13924 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
13925 declaration. Only look beginning from the current scope outward up
13926 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
13928 TEMPLATE_HEADER_P is true when this declaration is preceded by
13929 a set of template parameters. */
13932 xref_tag_1 (enum tag_types tag_code
, tree name
,
13933 tag_scope scope
, bool template_header_p
)
13935 enum tree_code code
;
13936 tree context
= NULL_TREE
;
13938 gcc_assert (identifier_p (name
));
13944 code
= RECORD_TYPE
;
13950 code
= ENUMERAL_TYPE
;
13953 gcc_unreachable ();
13956 /* In case of anonymous name, xref_tag is only called to
13957 make type node and push name. Name lookup is not required. */
13958 tree t
= NULL_TREE
;
13959 if (scope
!= ts_lambda
&& !anon_aggrname_p (name
))
13960 t
= lookup_and_check_tag (tag_code
, name
, scope
, template_header_p
);
13962 if (t
== error_mark_node
)
13963 return error_mark_node
;
13965 if (scope
!= ts_current
&& t
&& current_class_type
13966 && template_class_depth (current_class_type
)
13967 && template_header_p
)
13969 if (TREE_CODE (t
) == TEMPLATE_TEMPLATE_PARM
)
13972 /* Since SCOPE is not TS_CURRENT, we are not looking at a
13973 definition of this tag. Since, in addition, we are currently
13974 processing a (member) template declaration of a template
13975 class, we must be very careful; consider:
13977 template <class X> struct S1
13979 template <class U> struct S2
13981 template <class V> friend struct S1;
13984 Here, the S2::S1 declaration should not be confused with the
13985 outer declaration. In particular, the inner version should
13986 have a template parameter of level 2, not level 1.
13988 On the other hand, when presented with:
13990 template <class T> struct S1
13992 template <class U> struct S2 {};
13993 template <class U> friend struct S2;
13996 the friend must find S1::S2 eventually. We accomplish this
13997 by making sure that the new type we create to represent this
13998 declaration has the right TYPE_CONTEXT. */
13999 context
= TYPE_CONTEXT (t
);
14005 /* If no such tag is yet defined, create a forward-reference node
14006 and record it as the "definition".
14007 When a real declaration of this type is found,
14008 the forward-reference will be altered into a real type. */
14009 if (code
== ENUMERAL_TYPE
)
14011 error ("use of enum %q#D without previous declaration", name
);
14012 return error_mark_node
;
14016 t
= make_class_type (code
);
14017 TYPE_CONTEXT (t
) = context
;
14018 if (scope
== ts_lambda
)
14020 /* Mark it as a lambda type. */
14021 CLASSTYPE_LAMBDA_EXPR (t
) = error_mark_node
;
14022 /* And push it into current scope. */
14023 scope
= ts_current
;
14025 t
= pushtag (name
, t
, scope
);
14030 if (template_header_p
&& MAYBE_CLASS_TYPE_P (t
))
14032 /* Check that we aren't trying to overload a class with different
14034 tree constr
= NULL_TREE
;
14035 if (current_template_parms
)
14037 tree reqs
= TEMPLATE_PARMS_CONSTRAINTS (current_template_parms
);
14038 constr
= build_constraints (reqs
, NULL_TREE
);
14040 if (!redeclare_class_template (t
, current_template_parms
, constr
))
14041 return error_mark_node
;
14043 else if (!processing_template_decl
14044 && CLASS_TYPE_P (t
)
14045 && CLASSTYPE_IS_TEMPLATE (t
))
14047 error ("redeclaration of %qT as a non-template", t
);
14048 inform (location_of (t
), "previous declaration %qD", t
);
14049 return error_mark_node
;
14052 if (scope
!= ts_within_enclosing_non_class
&& TYPE_HIDDEN_P (t
))
14054 /* This is no longer an invisible friend. Make it
14056 tree decl
= TYPE_NAME (t
);
14058 DECL_ANTICIPATED (decl
) = false;
14059 DECL_FRIEND_P (decl
) = false;
14061 if (TYPE_TEMPLATE_INFO (t
))
14063 tree tmpl
= TYPE_TI_TEMPLATE (t
);
14064 DECL_ANTICIPATED (tmpl
) = false;
14065 DECL_FRIEND_P (tmpl
) = false;
14073 /* Wrapper for xref_tag_1. */
14076 xref_tag (enum tag_types tag_code
, tree name
,
14077 tag_scope scope
, bool template_header_p
)
14081 subtime
= timevar_cond_start (TV_NAME_LOOKUP
);
14082 ret
= xref_tag_1 (tag_code
, name
, scope
, template_header_p
);
14083 timevar_cond_stop (TV_NAME_LOOKUP
, subtime
);
14089 xref_tag_from_type (tree old
, tree id
, tag_scope scope
)
14091 enum tag_types tag_kind
;
14093 if (TREE_CODE (old
) == RECORD_TYPE
)
14094 tag_kind
= (CLASSTYPE_DECLARED_CLASS (old
) ? class_type
: record_type
);
14096 tag_kind
= union_type
;
14098 if (id
== NULL_TREE
)
14099 id
= TYPE_IDENTIFIER (old
);
14101 return xref_tag (tag_kind
, id
, scope
, false);
14104 /* Create the binfo hierarchy for REF with (possibly NULL) base list
14105 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
14106 access_* node, and the TREE_VALUE is the type of the base-class.
14107 Non-NULL TREE_TYPE indicates virtual inheritance. */
14110 xref_basetypes (tree ref
, tree base_list
)
14113 tree binfo
, base_binfo
;
14114 unsigned max_vbases
= 0; /* Maximum direct & indirect virtual bases. */
14115 unsigned max_bases
= 0; /* Maximum direct bases. */
14116 unsigned max_dvbases
= 0; /* Maximum direct virtual bases. */
14118 tree default_access
;
14119 tree igo_prev
; /* Track Inheritance Graph Order. */
14121 if (ref
== error_mark_node
)
14124 /* The base of a derived class is private by default, all others are
14126 default_access
= (TREE_CODE (ref
) == RECORD_TYPE
14127 && CLASSTYPE_DECLARED_CLASS (ref
)
14128 ? access_private_node
: access_public_node
);
14130 /* First, make sure that any templates in base-classes are
14131 instantiated. This ensures that if we call ourselves recursively
14132 we do not get confused about which classes are marked and which
14134 basep
= &base_list
;
14137 tree basetype
= TREE_VALUE (*basep
);
14139 /* The dependent_type_p call below should really be dependent_scope_p
14140 so that we give a hard error about using an incomplete type as a
14141 base, but we allow it with a pedwarn for backward
14143 if (processing_template_decl
14144 && CLASS_TYPE_P (basetype
) && TYPE_BEING_DEFINED (basetype
))
14145 cxx_incomplete_type_diagnostic (NULL_TREE
, basetype
, DK_PEDWARN
);
14146 if (!dependent_type_p (basetype
)
14147 && !complete_type_or_else (basetype
, NULL
))
14148 /* An incomplete type. Remove it from the list. */
14149 *basep
= TREE_CHAIN (*basep
);
14153 if (TREE_TYPE (*basep
))
14155 if (CLASS_TYPE_P (basetype
))
14156 max_vbases
+= vec_safe_length (CLASSTYPE_VBASECLASSES (basetype
));
14157 basep
= &TREE_CHAIN (*basep
);
14160 max_vbases
+= max_dvbases
;
14162 TYPE_MARKED_P (ref
) = 1;
14164 /* The binfo slot should be empty, unless this is an (ill-formed)
14166 gcc_assert (!TYPE_BINFO (ref
) || TYPE_SIZE (ref
));
14168 gcc_assert (TYPE_MAIN_VARIANT (ref
) == ref
);
14170 binfo
= make_tree_binfo (max_bases
);
14172 TYPE_BINFO (ref
) = binfo
;
14173 BINFO_OFFSET (binfo
) = size_zero_node
;
14174 BINFO_TYPE (binfo
) = ref
;
14176 /* Apply base-class info set up to the variants of this type. */
14177 fixup_type_variants (ref
);
14181 vec_alloc (BINFO_BASE_ACCESSES (binfo
), max_bases
);
14182 /* A C++98 POD cannot have base classes. */
14183 CLASSTYPE_NON_LAYOUT_POD_P (ref
) = true;
14185 if (TREE_CODE (ref
) == UNION_TYPE
)
14187 error ("derived union %qT invalid", ref
);
14193 warning (OPT_Wmultiple_inheritance
,
14194 "%qT defined with multiple direct bases", ref
);
14198 /* An aggregate can't have virtual base classes. */
14199 CLASSTYPE_NON_AGGREGATE (ref
) = true;
14201 vec_alloc (CLASSTYPE_VBASECLASSES (ref
), max_vbases
);
14204 warning (OPT_Wvirtual_inheritance
,
14205 "%qT defined with direct virtual base", ref
);
14208 for (igo_prev
= binfo
; base_list
; base_list
= TREE_CHAIN (base_list
))
14210 tree access
= TREE_PURPOSE (base_list
);
14211 int via_virtual
= TREE_TYPE (base_list
) != NULL_TREE
;
14212 tree basetype
= TREE_VALUE (base_list
);
14214 if (access
== access_default_node
)
14215 access
= default_access
;
14217 /* Before C++17, an aggregate cannot have base classes. In C++17, an
14218 aggregate can't have virtual, private, or protected base classes. */
14219 if (cxx_dialect
< cxx17
14220 || access
!= access_public_node
14222 CLASSTYPE_NON_AGGREGATE (ref
) = true;
14224 if (PACK_EXPANSION_P (basetype
))
14225 basetype
= PACK_EXPANSION_PATTERN (basetype
);
14226 if (TREE_CODE (basetype
) == TYPE_DECL
)
14227 basetype
= TREE_TYPE (basetype
);
14228 if (!MAYBE_CLASS_TYPE_P (basetype
) || TREE_CODE (basetype
) == UNION_TYPE
)
14230 error ("base type %qT fails to be a struct or class type",
14235 base_binfo
= NULL_TREE
;
14236 if (CLASS_TYPE_P (basetype
) && !dependent_scope_p (basetype
))
14238 base_binfo
= TYPE_BINFO (basetype
);
14239 /* The original basetype could have been a typedef'd type. */
14240 basetype
= BINFO_TYPE (base_binfo
);
14242 /* Inherit flags from the base. */
14243 TYPE_HAS_NEW_OPERATOR (ref
)
14244 |= TYPE_HAS_NEW_OPERATOR (basetype
);
14245 TYPE_HAS_ARRAY_NEW_OPERATOR (ref
)
14246 |= TYPE_HAS_ARRAY_NEW_OPERATOR (basetype
);
14247 TYPE_GETS_DELETE (ref
) |= TYPE_GETS_DELETE (basetype
);
14248 TYPE_HAS_CONVERSION (ref
) |= TYPE_HAS_CONVERSION (basetype
);
14249 CLASSTYPE_DIAMOND_SHAPED_P (ref
)
14250 |= CLASSTYPE_DIAMOND_SHAPED_P (basetype
);
14251 CLASSTYPE_REPEATED_BASE_P (ref
)
14252 |= CLASSTYPE_REPEATED_BASE_P (basetype
);
14255 /* We must do this test after we've seen through a typedef
14257 if (TYPE_MARKED_P (basetype
))
14259 if (basetype
== ref
)
14260 error ("recursive type %qT undefined", basetype
);
14262 error ("duplicate base type %qT invalid", basetype
);
14266 if (PACK_EXPANSION_P (TREE_VALUE (base_list
)))
14267 /* Regenerate the pack expansion for the bases. */
14268 basetype
= make_pack_expansion (basetype
);
14270 TYPE_MARKED_P (basetype
) = 1;
14272 base_binfo
= copy_binfo (base_binfo
, basetype
, ref
,
14273 &igo_prev
, via_virtual
);
14274 if (!BINFO_INHERITANCE_CHAIN (base_binfo
))
14275 BINFO_INHERITANCE_CHAIN (base_binfo
) = binfo
;
14277 BINFO_BASE_APPEND (binfo
, base_binfo
);
14278 BINFO_BASE_ACCESS_APPEND (binfo
, access
);
14282 /* Update max_vbases to reflect the reality that we are dropping
14283 this base: if it reaches zero we want to undo the vec_alloc
14284 above to avoid inconsistencies during error-recovery: eg, in
14285 build_special_member_call, CLASSTYPE_VBASECLASSES non null
14286 and vtt null (c++/27952). */
14289 if (CLASS_TYPE_P (basetype
))
14291 -= vec_safe_length (CLASSTYPE_VBASECLASSES (basetype
));
14294 if (CLASSTYPE_VBASECLASSES (ref
)
14295 && max_vbases
== 0)
14296 vec_free (CLASSTYPE_VBASECLASSES (ref
));
14298 if (vec_safe_length (CLASSTYPE_VBASECLASSES (ref
)) < max_vbases
)
14299 /* If we didn't get max_vbases vbases, we must have shared at
14300 least one of them, and are therefore diamond shaped. */
14301 CLASSTYPE_DIAMOND_SHAPED_P (ref
) = 1;
14303 /* Unmark all the types. */
14304 for (i
= 0; BINFO_BASE_ITERATE (binfo
, i
, base_binfo
); i
++)
14305 TYPE_MARKED_P (BINFO_TYPE (base_binfo
)) = 0;
14306 TYPE_MARKED_P (ref
) = 0;
14308 /* Now see if we have a repeated base type. */
14309 if (!CLASSTYPE_REPEATED_BASE_P (ref
))
14311 for (base_binfo
= binfo
; base_binfo
;
14312 base_binfo
= TREE_CHAIN (base_binfo
))
14314 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo
)))
14316 CLASSTYPE_REPEATED_BASE_P (ref
) = 1;
14319 TYPE_MARKED_P (BINFO_TYPE (base_binfo
)) = 1;
14321 for (base_binfo
= binfo
; base_binfo
;
14322 base_binfo
= TREE_CHAIN (base_binfo
))
14323 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo
)))
14324 TYPE_MARKED_P (BINFO_TYPE (base_binfo
)) = 0;
14331 /* Copies the enum-related properties from type SRC to type DST.
14332 Used with the underlying type of an enum and the enum itself. */
14334 copy_type_enum (tree dst
, tree src
)
14337 for (t
= dst
; t
; t
= TYPE_NEXT_VARIANT (t
))
14339 TYPE_MIN_VALUE (t
) = TYPE_MIN_VALUE (src
);
14340 TYPE_MAX_VALUE (t
) = TYPE_MAX_VALUE (src
);
14341 TYPE_SIZE (t
) = TYPE_SIZE (src
);
14342 TYPE_SIZE_UNIT (t
) = TYPE_SIZE_UNIT (src
);
14343 SET_TYPE_MODE (dst
, TYPE_MODE (src
));
14344 TYPE_PRECISION (t
) = TYPE_PRECISION (src
);
14345 unsigned valign
= TYPE_ALIGN (src
);
14346 if (TYPE_USER_ALIGN (t
))
14347 valign
= MAX (valign
, TYPE_ALIGN (t
));
14349 TYPE_USER_ALIGN (t
) = TYPE_USER_ALIGN (src
);
14350 SET_TYPE_ALIGN (t
, valign
);
14351 TYPE_UNSIGNED (t
) = TYPE_UNSIGNED (src
);
14355 /* Begin compiling the definition of an enumeration type.
14358 if ENUMTYPE is not NULL_TREE then the type has alredy been found.
14360 UNDERLYING_TYPE is the type that will be used as the storage for
14361 the enumeration type. This should be NULL_TREE if no storage type
14364 ATTRIBUTES are any attributes specified after the enum-key.
14366 SCOPED_ENUM_P is true if this is a scoped enumeration type.
14368 if IS_NEW is not NULL, gets TRUE iff a new type is created.
14370 Returns the type object, as yet incomplete.
14371 Also records info about it so that build_enumerator
14372 may be used to declare the individual values as they are read. */
14375 start_enum (tree name
, tree enumtype
, tree underlying_type
,
14376 tree attributes
, bool scoped_enum_p
, bool *is_new
)
14378 tree prevtype
= NULL_TREE
;
14379 gcc_assert (identifier_p (name
));
14383 /* [C++0x dcl.enum]p5:
14385 If not explicitly specified, the underlying type of a scoped
14386 enumeration type is int. */
14387 if (!underlying_type
&& scoped_enum_p
)
14388 underlying_type
= integer_type_node
;
14390 if (underlying_type
)
14391 underlying_type
= cv_unqualified (underlying_type
);
14393 /* If this is the real definition for a previous forward reference,
14394 fill in the contents in the same object that used to be the
14395 forward reference. */
14397 enumtype
= lookup_and_check_tag (enum_type
, name
,
14398 /*tag_scope=*/ts_current
,
14399 /*template_header_p=*/false);
14401 /* In case of a template_decl, the only check that should be deferred
14402 to instantiation time is the comparison of underlying types. */
14403 if (enumtype
&& TREE_CODE (enumtype
) == ENUMERAL_TYPE
)
14405 if (scoped_enum_p
!= SCOPED_ENUM_P (enumtype
))
14407 error_at (input_location
, "scoped/unscoped mismatch "
14408 "in enum %q#T", enumtype
);
14409 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype
)),
14410 "previous definition here");
14411 enumtype
= error_mark_node
;
14413 else if (ENUM_FIXED_UNDERLYING_TYPE_P (enumtype
) != !! underlying_type
)
14415 error_at (input_location
, "underlying type mismatch "
14416 "in enum %q#T", enumtype
);
14417 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype
)),
14418 "previous definition here");
14419 enumtype
= error_mark_node
;
14421 else if (underlying_type
&& ENUM_UNDERLYING_TYPE (enumtype
)
14422 && !same_type_p (underlying_type
,
14423 ENUM_UNDERLYING_TYPE (enumtype
)))
14425 error_at (input_location
, "different underlying type "
14426 "in enum %q#T", enumtype
);
14427 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype
)),
14428 "previous definition here");
14429 underlying_type
= NULL_TREE
;
14433 if (!enumtype
|| TREE_CODE (enumtype
) != ENUMERAL_TYPE
14434 || processing_template_decl
)
14436 /* In case of error, make a dummy enum to allow parsing to
14438 if (enumtype
== error_mark_node
)
14440 name
= make_anon_name ();
14441 enumtype
= NULL_TREE
;
14444 /* enumtype may be an ENUMERAL_TYPE if this is a redefinition
14445 of an opaque enum, or an opaque enum of an already defined
14446 enumeration (C++11).
14447 In any other case, it'll be NULL_TREE. */
14453 prevtype
= enumtype
;
14455 /* Do not push the decl more than once. */
14457 || TREE_CODE (enumtype
) != ENUMERAL_TYPE
)
14459 enumtype
= cxx_make_type (ENUMERAL_TYPE
);
14460 enumtype
= pushtag (name
, enumtype
, /*tag_scope=*/ts_current
);
14462 /* std::byte aliases anything. */
14463 if (enumtype
!= error_mark_node
14464 && TYPE_CONTEXT (enumtype
) == std_node
14465 && !strcmp ("byte", TYPE_NAME_STRING (enumtype
)))
14466 TYPE_ALIAS_SET (enumtype
) = 0;
14469 enumtype
= xref_tag (enum_type
, name
, /*tag_scope=*/ts_current
,
14472 if (enumtype
== error_mark_node
)
14473 return error_mark_node
;
14475 /* The enum is considered opaque until the opening '{' of the
14476 enumerator list. */
14477 SET_OPAQUE_ENUM_P (enumtype
, true);
14478 ENUM_FIXED_UNDERLYING_TYPE_P (enumtype
) = !! underlying_type
;
14481 SET_SCOPED_ENUM_P (enumtype
, scoped_enum_p
);
14483 cplus_decl_attributes (&enumtype
, attributes
, (int)ATTR_FLAG_TYPE_IN_PLACE
);
14485 if (underlying_type
)
14487 if (ENUM_UNDERLYING_TYPE (enumtype
))
14488 /* We already checked that it matches, don't change it to a different
14489 typedef variant. */;
14490 else if (CP_INTEGRAL_TYPE_P (underlying_type
))
14492 copy_type_enum (enumtype
, underlying_type
);
14493 ENUM_UNDERLYING_TYPE (enumtype
) = underlying_type
;
14495 else if (dependent_type_p (underlying_type
))
14496 ENUM_UNDERLYING_TYPE (enumtype
) = underlying_type
;
14498 error ("underlying type %qT of %qT must be an integral type",
14499 underlying_type
, enumtype
);
14502 /* If into a template class, the returned enum is always the first
14503 declaration (opaque or not) seen. This way all the references to
14504 this type will be to the same declaration. The following ones are used
14505 only to check for definition errors. */
14506 if (prevtype
&& processing_template_decl
)
14512 /* After processing and defining all the values of an enumeration type,
14513 install their decls in the enumeration type.
14514 ENUMTYPE is the type object. */
14517 finish_enum_value_list (tree enumtype
)
14520 tree underlying_type
;
14523 tree minnode
, maxnode
;
14526 bool fixed_underlying_type_p
14527 = ENUM_UNDERLYING_TYPE (enumtype
) != NULL_TREE
;
14529 /* We built up the VALUES in reverse order. */
14530 TYPE_VALUES (enumtype
) = nreverse (TYPE_VALUES (enumtype
));
14532 /* For an enum defined in a template, just set the type of the values;
14533 all further processing is postponed until the template is
14534 instantiated. We need to set the type so that tsubst of a CONST_DECL
14536 if (processing_template_decl
)
14538 for (values
= TYPE_VALUES (enumtype
);
14540 values
= TREE_CHAIN (values
))
14541 TREE_TYPE (TREE_VALUE (values
)) = enumtype
;
14545 /* Determine the minimum and maximum values of the enumerators. */
14546 if (TYPE_VALUES (enumtype
))
14548 minnode
= maxnode
= NULL_TREE
;
14550 for (values
= TYPE_VALUES (enumtype
);
14552 values
= TREE_CHAIN (values
))
14554 decl
= TREE_VALUE (values
);
14556 /* [dcl.enum]: Following the closing brace of an enum-specifier,
14557 each enumerator has the type of its enumeration. Prior to the
14558 closing brace, the type of each enumerator is the type of its
14559 initializing value. */
14560 TREE_TYPE (decl
) = enumtype
;
14562 /* Update the minimum and maximum values, if appropriate. */
14563 value
= DECL_INITIAL (decl
);
14564 if (value
== error_mark_node
)
14565 value
= integer_zero_node
;
14566 /* Figure out what the minimum and maximum values of the
14567 enumerators are. */
14569 minnode
= maxnode
= value
;
14570 else if (tree_int_cst_lt (maxnode
, value
))
14572 else if (tree_int_cst_lt (value
, minnode
))
14579 If the enumerator-list is empty, the underlying type is as if
14580 the enumeration had a single enumerator with value 0. */
14581 minnode
= maxnode
= integer_zero_node
;
14583 if (!fixed_underlying_type_p
)
14585 /* Compute the number of bits require to represent all values of the
14586 enumeration. We must do this before the type of MINNODE and
14587 MAXNODE are transformed, since tree_int_cst_min_precision relies
14588 on the TREE_TYPE of the value it is passed. */
14589 signop sgn
= tree_int_cst_sgn (minnode
) >= 0 ? UNSIGNED
: SIGNED
;
14590 int lowprec
= tree_int_cst_min_precision (minnode
, sgn
);
14591 int highprec
= tree_int_cst_min_precision (maxnode
, sgn
);
14592 int precision
= MAX (lowprec
, highprec
);
14594 bool use_short_enum
;
14596 /* Determine the underlying type of the enumeration.
14600 The underlying type of an enumeration is an integral type that
14601 can represent all the enumerator values defined in the
14602 enumeration. It is implementation-defined which integral type is
14603 used as the underlying type for an enumeration except that the
14604 underlying type shall not be larger than int unless the value of
14605 an enumerator cannot fit in an int or unsigned int.
14607 We use "int" or an "unsigned int" as the underlying type, even if
14608 a smaller integral type would work, unless the user has
14609 explicitly requested that we use the smallest possible type. The
14610 user can request that for all enumerations with a command line
14611 flag, or for just one enumeration with an attribute. */
14613 use_short_enum
= flag_short_enums
14614 || lookup_attribute ("packed", TYPE_ATTRIBUTES (enumtype
));
14616 /* If the precision of the type was specified with an attribute and it
14617 was too small, give an error. Otherwise, use it. */
14618 if (TYPE_PRECISION (enumtype
))
14620 if (precision
> TYPE_PRECISION (enumtype
))
14621 error ("specified mode too small for enumeral values");
14624 use_short_enum
= true;
14625 precision
= TYPE_PRECISION (enumtype
);
14629 for (itk
= (use_short_enum
? itk_char
: itk_int
);
14633 underlying_type
= integer_types
[itk
];
14634 if (underlying_type
!= NULL_TREE
14635 && TYPE_PRECISION (underlying_type
) >= precision
14636 && TYPE_SIGN (underlying_type
) == sgn
)
14639 if (itk
== itk_none
)
14643 IF no integral type can represent all the enumerator values, the
14644 enumeration is ill-formed. */
14645 error ("no integral type can represent all of the enumerator values "
14646 "for %qT", enumtype
);
14647 precision
= TYPE_PRECISION (long_long_integer_type_node
);
14648 underlying_type
= integer_types
[itk_unsigned_long_long
];
14653 The value of sizeof() applied to an enumeration type, an object
14654 of an enumeration type, or an enumerator, is the value of sizeof()
14655 applied to the underlying type. */
14656 copy_type_enum (enumtype
, underlying_type
);
14658 /* Compute the minimum and maximum values for the type.
14662 For an enumeration where emin is the smallest enumerator and emax
14663 is the largest, the values of the enumeration are the values of the
14664 underlying type in the range bmin to bmax, where bmin and bmax are,
14665 respectively, the smallest and largest values of the smallest bit-
14666 field that can store emin and emax. */
14668 /* The middle-end currently assumes that types with TYPE_PRECISION
14669 narrower than their underlying type are suitably zero or sign
14670 extended to fill their mode. Similarly, it assumes that the front
14671 end assures that a value of a particular type must be within
14672 TYPE_MIN_VALUE and TYPE_MAX_VALUE.
14674 We used to set these fields based on bmin and bmax, but that led
14675 to invalid assumptions like optimizing away bounds checking. So
14676 now we just set the TYPE_PRECISION, TYPE_MIN_VALUE, and
14677 TYPE_MAX_VALUE to the values for the mode above and only restrict
14678 the ENUM_UNDERLYING_TYPE for the benefit of diagnostics. */
14679 ENUM_UNDERLYING_TYPE (enumtype
)
14680 = build_distinct_type_copy (underlying_type
);
14681 TYPE_PRECISION (ENUM_UNDERLYING_TYPE (enumtype
)) = precision
;
14682 set_min_and_max_values_for_integral_type
14683 (ENUM_UNDERLYING_TYPE (enumtype
), precision
, sgn
);
14685 /* If -fstrict-enums, still constrain TYPE_MIN/MAX_VALUE. */
14686 if (flag_strict_enums
)
14687 set_min_and_max_values_for_integral_type (enumtype
, precision
, sgn
);
14690 underlying_type
= ENUM_UNDERLYING_TYPE (enumtype
);
14692 /* Convert each of the enumerators to the type of the underlying
14693 type of the enumeration. */
14694 for (values
= TYPE_VALUES (enumtype
); values
; values
= TREE_CHAIN (values
))
14696 location_t saved_location
;
14698 decl
= TREE_VALUE (values
);
14699 saved_location
= input_location
;
14700 input_location
= DECL_SOURCE_LOCATION (decl
);
14701 if (fixed_underlying_type_p
)
14702 /* If the enumeration type has a fixed underlying type, we
14703 already checked all of the enumerator values. */
14704 value
= DECL_INITIAL (decl
);
14706 value
= perform_implicit_conversion (underlying_type
,
14707 DECL_INITIAL (decl
),
14708 tf_warning_or_error
);
14709 input_location
= saved_location
;
14711 /* Do not clobber shared ints. */
14712 if (value
!= error_mark_node
)
14714 value
= copy_node (value
);
14716 TREE_TYPE (value
) = enumtype
;
14718 DECL_INITIAL (decl
) = value
;
14721 /* Fix up all variant types of this enum type. */
14722 for (t
= TYPE_MAIN_VARIANT (enumtype
); t
; t
= TYPE_NEXT_VARIANT (t
))
14723 TYPE_VALUES (t
) = TYPE_VALUES (enumtype
);
14725 if (at_class_scope_p ()
14726 && COMPLETE_TYPE_P (current_class_type
)
14727 && UNSCOPED_ENUM_P (enumtype
))
14729 insert_late_enum_def_bindings (current_class_type
, enumtype
);
14730 /* TYPE_FIELDS needs fixup. */
14731 fixup_type_variants (current_class_type
);
14734 /* Finish debugging output for this type. */
14735 rest_of_type_compilation (enumtype
, namespace_bindings_p ());
14737 /* Each enumerator now has the type of its enumeration. Clear the cache
14738 so that this change in types doesn't confuse us later on. */
14739 clear_cv_and_fold_caches ();
14742 /* Finishes the enum type. This is called only the first time an
14743 enumeration is seen, be it opaque or odinary.
14744 ENUMTYPE is the type object. */
14747 finish_enum (tree enumtype
)
14749 if (processing_template_decl
)
14751 if (at_function_scope_p ())
14752 add_stmt (build_min (TAG_DEFN
, enumtype
));
14756 /* If this is a forward declaration, there should not be any variants,
14757 though we can get a variant in the middle of an enum-specifier with
14758 wacky code like 'enum E { e = sizeof(const E*) };' */
14759 gcc_assert (enumtype
== TYPE_MAIN_VARIANT (enumtype
)
14760 && (TYPE_VALUES (enumtype
)
14761 || !TYPE_NEXT_VARIANT (enumtype
)));
14764 /* Build and install a CONST_DECL for an enumeration constant of the
14765 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
14766 Apply ATTRIBUTES if available. LOC is the location of NAME.
14767 Assignment of sequential values by default is handled here. */
14770 build_enumerator (tree name
, tree value
, tree enumtype
, tree attributes
,
14777 /* scalar_constant_value will pull out this expression, so make sure
14778 it's folded as appropriate. */
14779 if (processing_template_decl
)
14780 value
= fold_non_dependent_expr (value
);
14782 /* If the VALUE was erroneous, pretend it wasn't there; that will
14783 result in the enum being assigned the next value in sequence. */
14784 if (value
== error_mark_node
)
14787 /* Remove no-op casts from the value. */
14789 STRIP_TYPE_NOPS (value
);
14791 if (! processing_template_decl
)
14793 /* Validate and default VALUE. */
14794 if (value
!= NULL_TREE
)
14796 if (!ENUM_UNDERLYING_TYPE (enumtype
))
14798 tree tmp_value
= build_expr_type_conversion (WANT_INT
| WANT_ENUM
,
14803 else if (! INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P
14804 (TREE_TYPE (value
)))
14805 value
= perform_implicit_conversion_flags
14806 (ENUM_UNDERLYING_TYPE (enumtype
), value
, tf_warning_or_error
,
14807 LOOKUP_IMPLICIT
| LOOKUP_NO_NARROWING
);
14809 if (value
== error_mark_node
)
14812 if (value
!= NULL_TREE
)
14814 if (! INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P
14815 (TREE_TYPE (value
)))
14817 error ("enumerator value for %qD must have integral or "
14818 "unscoped enumeration type", name
);
14823 value
= cxx_constant_value (value
);
14825 if (TREE_CODE (value
) != INTEGER_CST
)
14827 error ("enumerator value for %qD is not an integer "
14835 /* Default based on previous value. */
14836 if (value
== NULL_TREE
)
14838 if (TYPE_VALUES (enumtype
))
14842 /* C++03 7.2/4: If no initializer is specified for the first
14843 enumerator, the type is an unspecified integral
14844 type. Otherwise the type is the same as the type of the
14845 initializing value of the preceding enumerator unless the
14846 incremented value is not representable in that type, in
14847 which case the type is an unspecified integral type
14848 sufficient to contain the incremented value. */
14849 prev_value
= DECL_INITIAL (TREE_VALUE (TYPE_VALUES (enumtype
)));
14850 if (error_operand_p (prev_value
))
14851 value
= error_mark_node
;
14854 wi::overflow_type overflowed
;
14855 tree type
= TREE_TYPE (prev_value
);
14856 signop sgn
= TYPE_SIGN (type
);
14857 widest_int wi
= wi::add (wi::to_widest (prev_value
), 1, sgn
,
14861 bool pos
= !wi::neg_p (wi
, sgn
);
14862 if (!wi::fits_to_tree_p (wi
, type
))
14865 for (itk
= itk_int
; itk
!= itk_none
; itk
++)
14867 type
= integer_types
[itk
];
14868 if (type
!= NULL_TREE
14869 && (pos
|| !TYPE_UNSIGNED (type
))
14870 && wi::fits_to_tree_p (wi
, type
))
14873 if (type
&& cxx_dialect
< cxx11
14874 && itk
> itk_unsigned_long
)
14875 pedwarn (input_location
, OPT_Wlong_long
,
14877 incremented enumerator value is too large for %<unsigned long%>") : G_("\
14878 incremented enumerator value is too large for %<long%>"));
14880 if (type
== NULL_TREE
)
14881 overflowed
= wi::OVF_UNKNOWN
;
14883 value
= wide_int_to_tree (type
, wi
);
14888 error ("overflow in enumeration values at %qD", name
);
14889 value
= error_mark_node
;
14894 value
= integer_zero_node
;
14897 /* Remove no-op casts from the value. */
14898 STRIP_TYPE_NOPS (value
);
14900 /* If the underlying type of the enum is fixed, check whether
14901 the enumerator values fits in the underlying type. If it
14902 does not fit, the program is ill-formed [C++0x dcl.enum]. */
14903 if (ENUM_UNDERLYING_TYPE (enumtype
)
14905 && TREE_CODE (value
) == INTEGER_CST
)
14907 if (!int_fits_type_p (value
, ENUM_UNDERLYING_TYPE (enumtype
)))
14908 error ("enumerator value %qE is outside the range of underlying "
14909 "type %qT", value
, ENUM_UNDERLYING_TYPE (enumtype
));
14911 /* Convert the value to the appropriate type. */
14912 value
= fold_convert (ENUM_UNDERLYING_TYPE (enumtype
), value
);
14916 /* C++ associates enums with global, function, or class declarations. */
14917 context
= current_scope ();
14919 /* Build the actual enumeration constant. Note that the enumeration
14920 constants have the underlying type of the enum (if it is fixed)
14921 or the type of their initializer (if the underlying type of the
14922 enum is not fixed):
14926 If the underlying type is fixed, the type of each enumerator
14927 prior to the closing brace is the underlying type; if the
14928 initializing value of an enumerator cannot be represented by
14929 the underlying type, the program is ill-formed. If the
14930 underlying type is not fixed, the type of each enumerator is
14931 the type of its initializing value.
14933 If the underlying type is not fixed, it will be computed by
14934 finish_enum and we will reset the type of this enumerator. Of
14935 course, if we're processing a template, there may be no value. */
14936 type
= value
? TREE_TYPE (value
) : NULL_TREE
;
14938 decl
= build_decl (loc
, CONST_DECL
, name
, type
);
14940 DECL_CONTEXT (decl
) = enumtype
;
14941 TREE_CONSTANT (decl
) = 1;
14942 TREE_READONLY (decl
) = 1;
14943 DECL_INITIAL (decl
) = value
;
14946 cplus_decl_attributes (&decl
, attributes
, 0);
14948 if (context
&& context
== current_class_type
&& !SCOPED_ENUM_P (enumtype
))
14950 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
14951 on the TYPE_FIELDS list for `S'. (That's so that you can say
14952 things like `S::i' later.) */
14954 /* The enumerator may be getting declared outside of its enclosing
14957 class S { public: enum E : int; }; enum S::E : int { i = 7; };
14959 For which case we need to make sure that the access of `S::i'
14960 matches the access of `S::E'. */
14961 tree saved_cas
= current_access_specifier
;
14962 if (TREE_PRIVATE (TYPE_NAME (enumtype
)))
14963 current_access_specifier
= access_private_node
;
14964 else if (TREE_PROTECTED (TYPE_NAME (enumtype
)))
14965 current_access_specifier
= access_protected_node
;
14967 current_access_specifier
= access_public_node
;
14969 finish_member_declaration (decl
);
14971 current_access_specifier
= saved_cas
;
14976 /* Add this enumeration constant to the list for this type. */
14977 TYPE_VALUES (enumtype
) = tree_cons (name
, decl
, TYPE_VALUES (enumtype
));
14980 /* Look for an enumerator with the given NAME within the enumeration
14981 type ENUMTYPE. This routine is used primarily for qualified name
14982 lookup into an enumerator in C++0x, e.g.,
14984 enum class Color { Red, Green, Blue };
14986 Color color = Color::Red;
14988 Returns the value corresponding to the enumerator, or
14989 NULL_TREE if no such enumerator was found. */
14991 lookup_enumerator (tree enumtype
, tree name
)
14994 gcc_assert (enumtype
&& TREE_CODE (enumtype
) == ENUMERAL_TYPE
);
14996 e
= purpose_member (name
, TYPE_VALUES (enumtype
));
14997 return e
? TREE_VALUE (e
) : NULL_TREE
;
15001 /* We're defining DECL. Make sure that its type is OK. */
15004 check_function_type (tree decl
, tree current_function_parms
)
15006 tree fntype
= TREE_TYPE (decl
);
15007 tree return_type
= complete_type (TREE_TYPE (fntype
));
15009 /* In a function definition, arg types must be complete. */
15010 require_complete_types_for_parms (current_function_parms
);
15012 if (dependent_type_p (return_type
)
15013 || type_uses_auto (return_type
))
15015 if (!COMPLETE_OR_VOID_TYPE_P (return_type
))
15017 tree args
= TYPE_ARG_TYPES (fntype
);
15019 error ("return type %q#T is incomplete", return_type
);
15021 /* Make it return void instead. */
15022 if (TREE_CODE (fntype
) == METHOD_TYPE
)
15023 fntype
= build_method_type_directly (TREE_TYPE (TREE_VALUE (args
)),
15025 TREE_CHAIN (args
));
15027 fntype
= build_function_type (void_type_node
, args
);
15028 fntype
= (cp_build_type_attribute_variant
15029 (fntype
, TYPE_ATTRIBUTES (TREE_TYPE (decl
))));
15030 fntype
= cxx_copy_lang_qualifiers (fntype
, TREE_TYPE (decl
));
15031 TREE_TYPE (decl
) = fntype
;
15035 abstract_virtuals_error (decl
, TREE_TYPE (fntype
));
15036 maybe_warn_parm_abi (TREE_TYPE (fntype
),
15037 DECL_SOURCE_LOCATION (decl
));
15041 /* True iff FN is an implicitly-defined default constructor. */
15044 implicit_default_ctor_p (tree fn
)
15046 return (DECL_CONSTRUCTOR_P (fn
)
15047 && !user_provided_p (fn
)
15048 && sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (fn
)));
15051 /* Clobber the contents of *this to let the back end know that the object
15052 storage is dead when we enter the constructor or leave the destructor. */
15055 build_clobber_this ()
15057 /* Clobbering an empty base is pointless, and harmful if its one byte
15058 TYPE_SIZE overlays real data. */
15059 if (is_empty_class (current_class_type
))
15062 /* If we have virtual bases, clobber the whole object, but only if we're in
15063 charge. If we don't have virtual bases, clobber the as-base type so we
15064 don't mess with tail padding. */
15065 bool vbases
= CLASSTYPE_VBASECLASSES (current_class_type
);
15067 tree ctype
= current_class_type
;
15069 ctype
= CLASSTYPE_AS_BASE (ctype
);
15071 tree clobber
= build_clobber (ctype
);
15073 tree thisref
= current_class_ref
;
15074 if (ctype
!= current_class_type
)
15076 thisref
= build_nop (build_reference_type (ctype
), current_class_ptr
);
15077 thisref
= convert_from_reference (thisref
);
15080 tree exprstmt
= build2 (MODIFY_EXPR
, void_type_node
, thisref
, clobber
);
15082 exprstmt
= build_if_in_charge (exprstmt
);
15087 /* Create the FUNCTION_DECL for a function definition.
15088 DECLSPECS and DECLARATOR are the parts of the declaration;
15089 they describe the function's name and the type it returns,
15090 but twisted together in a fashion that parallels the syntax of C.
15092 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
15093 DECLARATOR is really the DECL for the function we are about to
15094 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
15095 indicating that the function is an inline defined in-class.
15097 This function creates a binding context for the function body
15098 as well as setting up the FUNCTION_DECL in current_function_decl.
15100 For C++, we must first check whether that datum makes any sense.
15101 For example, "class A local_a(1,2);" means that variable local_a
15102 is an aggregate of type A, which should have a constructor
15103 applied to it with the argument list [1, 2].
15105 On entry, DECL_INITIAL (decl1) should be NULL_TREE or error_mark_node,
15106 or may be a BLOCK if the function has been defined previously
15107 in this translation unit. On exit, DECL_INITIAL (decl1) will be
15108 error_mark_node if the function has never been defined, or
15109 a BLOCK if the function has been defined somewhere. */
15112 start_preparsed_function (tree decl1
, tree attrs
, int flags
)
15114 tree ctype
= NULL_TREE
;
15117 int doing_friend
= 0;
15118 cp_binding_level
*bl
;
15119 tree current_function_parms
;
15120 struct c_fileinfo
*finfo
15121 = get_fileinfo (LOCATION_FILE (DECL_SOURCE_LOCATION (decl1
)));
15122 bool honor_interface
;
15124 /* Sanity check. */
15125 gcc_assert (VOID_TYPE_P (TREE_VALUE (void_list_node
)));
15126 gcc_assert (TREE_CHAIN (void_list_node
) == NULL_TREE
);
15128 fntype
= TREE_TYPE (decl1
);
15129 if (TREE_CODE (fntype
) == METHOD_TYPE
)
15130 ctype
= TYPE_METHOD_BASETYPE (fntype
);
15132 /* ISO C++ 11.4/5. A friend function defined in a class is in
15133 the (lexical) scope of the class in which it is defined. */
15134 if (!ctype
&& DECL_FRIEND_P (decl1
))
15136 ctype
= DECL_FRIEND_CONTEXT (decl1
);
15138 /* CTYPE could be null here if we're dealing with a template;
15139 for example, `inline friend float foo()' inside a template
15140 will have no CTYPE set. */
15141 if (ctype
&& TREE_CODE (ctype
) != RECORD_TYPE
)
15147 if (DECL_DECLARED_INLINE_P (decl1
)
15148 && lookup_attribute ("noinline", attrs
))
15149 warning_at (DECL_SOURCE_LOCATION (decl1
), 0,
15150 "inline function %qD given attribute noinline", decl1
);
15152 /* Handle gnu_inline attribute. */
15153 if (GNU_INLINE_P (decl1
))
15155 DECL_EXTERNAL (decl1
) = 1;
15156 DECL_NOT_REALLY_EXTERN (decl1
) = 0;
15157 DECL_INTERFACE_KNOWN (decl1
) = 1;
15158 DECL_DISREGARD_INLINE_LIMITS (decl1
) = 1;
15161 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl1
))
15162 /* This is a constructor, we must ensure that any default args
15163 introduced by this definition are propagated to the clones
15164 now. The clones are used directly in overload resolution. */
15165 adjust_clone_args (decl1
);
15167 /* Sometimes we don't notice that a function is a static member, and
15168 build a METHOD_TYPE for it. Fix that up now. */
15169 gcc_assert (!(ctype
!= NULL_TREE
&& DECL_STATIC_FUNCTION_P (decl1
)
15170 && TREE_CODE (TREE_TYPE (decl1
)) == METHOD_TYPE
));
15172 /* Set up current_class_type, and enter the scope of the class, if
15175 push_nested_class (ctype
);
15176 else if (DECL_STATIC_FUNCTION_P (decl1
))
15177 push_nested_class (DECL_CONTEXT (decl1
));
15179 /* Now that we have entered the scope of the class, we must restore
15180 the bindings for any template parameters surrounding DECL1, if it
15181 is an inline member template. (Order is important; consider the
15182 case where a template parameter has the same name as a field of
15183 the class.) It is not until after this point that
15184 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
15185 if (flags
& SF_INCLASS_INLINE
)
15186 maybe_begin_member_template_processing (decl1
);
15188 /* Effective C++ rule 15. */
15190 && DECL_ASSIGNMENT_OPERATOR_P (decl1
)
15191 && DECL_OVERLOADED_OPERATOR_IS (decl1
, NOP_EXPR
)
15192 && VOID_TYPE_P (TREE_TYPE (fntype
)))
15193 warning (OPT_Weffc__
,
15194 "%<operator=%> should return a reference to %<*this%>");
15196 /* Make the init_value nonzero so pushdecl knows this is not tentative.
15197 error_mark_node is replaced below (in poplevel) with the BLOCK. */
15198 if (!DECL_INITIAL (decl1
))
15199 DECL_INITIAL (decl1
) = error_mark_node
;
15201 /* This function exists in static storage.
15202 (This does not mean `static' in the C sense!) */
15203 TREE_STATIC (decl1
) = 1;
15205 /* We must call push_template_decl after current_class_type is set
15206 up. (If we are processing inline definitions after exiting a
15207 class scope, current_class_type will be NULL_TREE until set above
15208 by push_nested_class.) */
15209 if (processing_template_decl
)
15211 tree newdecl1
= push_template_decl (decl1
);
15212 if (newdecl1
== error_mark_node
)
15214 if (ctype
|| DECL_STATIC_FUNCTION_P (decl1
))
15215 pop_nested_class ();
15221 /* Make sure the parameter and return types are reasonable. When
15222 you declare a function, these types can be incomplete, but they
15223 must be complete when you define the function. */
15224 check_function_type (decl1
, DECL_ARGUMENTS (decl1
));
15226 /* Build the return declaration for the function. */
15227 restype
= TREE_TYPE (fntype
);
15229 if (DECL_RESULT (decl1
) == NULL_TREE
)
15233 resdecl
= build_decl (input_location
, RESULT_DECL
, 0, restype
);
15234 DECL_ARTIFICIAL (resdecl
) = 1;
15235 DECL_IGNORED_P (resdecl
) = 1;
15236 DECL_RESULT (decl1
) = resdecl
;
15238 cp_apply_type_quals_to_decl (cp_type_quals (restype
), resdecl
);
15241 /* Record the decl so that the function name is defined.
15242 If we already have a decl for this name, and it is a FUNCTION_DECL,
15243 use the old decl. */
15244 if (!processing_template_decl
&& !(flags
& SF_PRE_PARSED
))
15246 /* A specialization is not used to guide overload resolution. */
15247 if (!DECL_FUNCTION_MEMBER_P (decl1
)
15248 && !(DECL_USE_TEMPLATE (decl1
) &&
15249 PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl1
))))
15251 tree olddecl
= pushdecl (decl1
);
15253 if (olddecl
== error_mark_node
)
15254 /* If something went wrong when registering the declaration,
15255 use DECL1; we have to have a FUNCTION_DECL to use when
15256 parsing the body of the function. */
15260 /* Otherwise, OLDDECL is either a previous declaration
15261 of the same function or DECL1 itself. */
15263 if (warn_missing_declarations
15264 && olddecl
== decl1
15265 && !DECL_MAIN_P (decl1
)
15266 && TREE_PUBLIC (decl1
)
15267 && !DECL_DECLARED_INLINE_P (decl1
))
15271 /* Check whether DECL1 is in an anonymous
15273 for (context
= DECL_CONTEXT (decl1
);
15275 context
= DECL_CONTEXT (context
))
15277 if (TREE_CODE (context
) == NAMESPACE_DECL
15278 && DECL_NAME (context
) == NULL_TREE
)
15282 if (context
== NULL
)
15283 warning_at (DECL_SOURCE_LOCATION (decl1
),
15284 OPT_Wmissing_declarations
,
15285 "no previous declaration for %qD", decl1
);
15293 /* We need to set the DECL_CONTEXT. */
15294 if (!DECL_CONTEXT (decl1
) && DECL_TEMPLATE_INFO (decl1
))
15295 DECL_CONTEXT (decl1
) = DECL_CONTEXT (DECL_TI_TEMPLATE (decl1
));
15297 fntype
= TREE_TYPE (decl1
);
15298 restype
= TREE_TYPE (fntype
);
15300 /* If #pragma weak applies, mark the decl appropriately now.
15301 The pragma only applies to global functions. Because
15302 determining whether or not the #pragma applies involves
15303 computing the mangled name for the declaration, we cannot
15304 apply the pragma until after we have merged this declaration
15305 with any previous declarations; if the original declaration
15306 has a linkage specification, that specification applies to
15307 the definition as well, and may affect the mangled name. */
15308 if (DECL_FILE_SCOPE_P (decl1
))
15309 maybe_apply_pragma_weak (decl1
);
15312 /* We are now in the scope of the function being defined. */
15313 current_function_decl
= decl1
;
15315 /* Save the parm names or decls from this function's declarator
15316 where store_parm_decls will find them. */
15317 current_function_parms
= DECL_ARGUMENTS (decl1
);
15319 /* Let the user know we're compiling this function. */
15320 announce_function (decl1
);
15322 gcc_assert (DECL_INITIAL (decl1
));
15324 /* This function may already have been parsed, in which case just
15325 return; our caller will skip over the body without parsing. */
15326 if (DECL_INITIAL (decl1
) != error_mark_node
)
15329 /* Initialize RTL machinery. We cannot do this until
15330 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
15331 even when processing a template; this is how we get
15332 CFUN set up, and our per-function variables initialized.
15333 FIXME factor out the non-RTL stuff. */
15334 bl
= current_binding_level
;
15335 allocate_struct_function (decl1
, processing_template_decl
);
15337 /* Initialize the language data structures. Whenever we start
15338 a new function, we destroy temporaries in the usual way. */
15339 cfun
->language
= ggc_cleared_alloc
<language_function
> ();
15340 current_stmt_tree ()->stmts_are_full_exprs_p
= 1;
15341 current_binding_level
= bl
;
15343 if (!processing_template_decl
&& type_uses_auto (restype
))
15345 FNDECL_USED_AUTO (decl1
) = true;
15346 current_function_auto_return_pattern
= restype
;
15349 /* Start the statement-tree, start the tree now. */
15350 DECL_SAVED_TREE (decl1
) = push_stmt_list ();
15352 /* If we are (erroneously) defining a function that we have already
15353 defined before, wipe out what we knew before. */
15354 if (!DECL_PENDING_INLINE_P (decl1
))
15355 DECL_SAVED_FUNCTION_DATA (decl1
) = NULL
;
15357 if (ctype
&& !doing_friend
&& !DECL_STATIC_FUNCTION_P (decl1
))
15359 /* We know that this was set up by `grokclassfn'. We do not
15360 wait until `store_parm_decls', since evil parse errors may
15361 never get us to that point. Here we keep the consistency
15362 between `current_class_type' and `current_class_ptr'. */
15363 tree t
= DECL_ARGUMENTS (decl1
);
15365 gcc_assert (t
!= NULL_TREE
&& TREE_CODE (t
) == PARM_DECL
);
15366 gcc_assert (TYPE_PTR_P (TREE_TYPE (t
)));
15368 cp_function_chain
->x_current_class_ref
15369 = cp_build_fold_indirect_ref (t
);
15370 /* Set this second to avoid shortcut in cp_build_indirect_ref. */
15371 cp_function_chain
->x_current_class_ptr
= t
;
15373 /* Constructors and destructors need to know whether they're "in
15374 charge" of initializing virtual base classes. */
15375 t
= DECL_CHAIN (t
);
15376 if (DECL_HAS_IN_CHARGE_PARM_P (decl1
))
15378 current_in_charge_parm
= t
;
15379 t
= DECL_CHAIN (t
);
15381 if (DECL_HAS_VTT_PARM_P (decl1
))
15383 gcc_assert (DECL_NAME (t
) == vtt_parm_identifier
);
15384 current_vtt_parm
= t
;
15388 honor_interface
= (!DECL_TEMPLATE_INSTANTIATION (decl1
)
15389 /* Implicitly-defined methods (like the
15390 destructor for a class in which no destructor
15391 is explicitly declared) must not be defined
15392 until their definition is needed. So, we
15393 ignore interface specifications for
15394 compiler-generated functions. */
15395 && !DECL_ARTIFICIAL (decl1
));
15397 if (processing_template_decl
)
15398 /* Don't mess with interface flags. */;
15399 else if (DECL_INTERFACE_KNOWN (decl1
))
15401 tree ctx
= decl_function_context (decl1
);
15403 if (DECL_NOT_REALLY_EXTERN (decl1
))
15404 DECL_EXTERNAL (decl1
) = 0;
15406 if (ctx
!= NULL_TREE
&& vague_linkage_p (ctx
))
15407 /* This is a function in a local class in an extern inline
15408 or template function. */
15409 comdat_linkage (decl1
);
15411 /* If this function belongs to an interface, it is public.
15412 If it belongs to someone else's interface, it is also external.
15413 This only affects inlines and template instantiations. */
15414 else if (!finfo
->interface_unknown
&& honor_interface
)
15416 if (DECL_DECLARED_INLINE_P (decl1
)
15417 || DECL_TEMPLATE_INSTANTIATION (decl1
))
15419 DECL_EXTERNAL (decl1
)
15420 = (finfo
->interface_only
15421 || (DECL_DECLARED_INLINE_P (decl1
)
15422 && ! flag_implement_inlines
15423 && !DECL_VINDEX (decl1
)));
15425 /* For WIN32 we also want to put these in linkonce sections. */
15426 maybe_make_one_only (decl1
);
15429 DECL_EXTERNAL (decl1
) = 0;
15430 DECL_INTERFACE_KNOWN (decl1
) = 1;
15431 /* If this function is in an interface implemented in this file,
15432 make sure that the back end knows to emit this function
15434 if (!DECL_EXTERNAL (decl1
))
15435 mark_needed (decl1
);
15437 else if (finfo
->interface_unknown
&& finfo
->interface_only
15438 && honor_interface
)
15440 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
15441 interface, we will have both finfo->interface_unknown and
15442 finfo->interface_only set. In that case, we don't want to
15443 use the normal heuristics because someone will supply a
15444 #pragma implementation elsewhere, and deducing it here would
15445 produce a conflict. */
15446 comdat_linkage (decl1
);
15447 DECL_EXTERNAL (decl1
) = 0;
15448 DECL_INTERFACE_KNOWN (decl1
) = 1;
15449 DECL_DEFER_OUTPUT (decl1
) = 1;
15453 /* This is a definition, not a reference.
15454 So clear DECL_EXTERNAL, unless this is a GNU extern inline. */
15455 if (!GNU_INLINE_P (decl1
))
15456 DECL_EXTERNAL (decl1
) = 0;
15458 if ((DECL_DECLARED_INLINE_P (decl1
)
15459 || DECL_TEMPLATE_INSTANTIATION (decl1
))
15460 && ! DECL_INTERFACE_KNOWN (decl1
))
15461 DECL_DEFER_OUTPUT (decl1
) = 1;
15463 DECL_INTERFACE_KNOWN (decl1
) = 1;
15466 /* Determine the ELF visibility attribute for the function. We must not
15467 do this before calling "pushdecl", as we must allow "duplicate_decls"
15468 to merge any attributes appropriately. We also need to wait until
15470 if (!DECL_CLONED_FUNCTION_P (decl1
))
15471 determine_visibility (decl1
);
15473 if (!processing_template_decl
)
15474 maybe_instantiate_noexcept (decl1
);
15476 begin_scope (sk_function_parms
, decl1
);
15480 if (DECL_DESTRUCTOR_P (decl1
)
15481 || (DECL_CONSTRUCTOR_P (decl1
)
15482 && targetm
.cxx
.cdtor_returns_this ()))
15484 cdtor_label
= create_artificial_label (input_location
);
15485 LABEL_DECL_CDTOR (cdtor_label
) = true;
15488 start_fname_decls ();
15490 store_parm_decls (current_function_parms
);
15492 if (!processing_template_decl
15493 && (flag_lifetime_dse
> 1)
15494 && DECL_CONSTRUCTOR_P (decl1
)
15495 && !DECL_CLONED_FUNCTION_P (decl1
)
15496 /* Clobbering an empty base is harmful if it overlays real data. */
15497 && !is_empty_class (current_class_type
)
15498 /* We can't clobber safely for an implicitly-defined default constructor
15499 because part of the initialization might happen before we enter the
15500 constructor, via AGGR_INIT_ZERO_FIRST (c++/68006). */
15501 && !implicit_default_ctor_p (decl1
))
15502 finish_expr_stmt (build_clobber_this ());
15504 if (!processing_template_decl
15505 && DECL_CONSTRUCTOR_P (decl1
)
15506 && sanitize_flags_p (SANITIZE_VPTR
)
15507 && !DECL_CLONED_FUNCTION_P (decl1
)
15508 && !implicit_default_ctor_p (decl1
))
15509 cp_ubsan_maybe_initialize_vtbl_ptrs (current_class_ptr
);
15511 start_lambda_scope (decl1
);
15517 /* Like start_preparsed_function, except that instead of a
15518 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
15520 Returns true on success. If the DECLARATOR is not suitable
15521 for a function, we return false, which tells the parser to
15522 skip the entire function. */
15525 start_function (cp_decl_specifier_seq
*declspecs
,
15526 const cp_declarator
*declarator
,
15531 decl1
= grokdeclarator (declarator
, declspecs
, FUNCDEF
, 1, &attrs
);
15532 invoke_plugin_callbacks (PLUGIN_START_PARSE_FUNCTION
, decl1
);
15533 if (decl1
== error_mark_node
)
15535 /* If the declarator is not suitable for a function definition,
15536 cause a syntax error. */
15537 if (decl1
== NULL_TREE
|| TREE_CODE (decl1
) != FUNCTION_DECL
)
15539 error ("invalid function declaration");
15543 if (DECL_MAIN_P (decl1
))
15544 /* main must return int. grokfndecl should have corrected it
15545 (and issued a diagnostic) if the user got it wrong. */
15546 gcc_assert (same_type_p (TREE_TYPE (TREE_TYPE (decl1
)),
15547 integer_type_node
));
15549 return start_preparsed_function (decl1
, attrs
, /*flags=*/SF_DEFAULT
);
15552 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
15556 use_eh_spec_block (tree fn
)
15558 return (flag_exceptions
&& flag_enforce_eh_specs
15559 && !processing_template_decl
15560 && !type_throw_all_p (TREE_TYPE (fn
))
15561 /* We insert the EH_SPEC_BLOCK only in the original
15562 function; then, it is copied automatically to the
15564 && !DECL_CLONED_FUNCTION_P (fn
)
15565 /* Implicitly-generated constructors and destructors have
15566 exception specifications. However, those specifications
15567 are the union of the possible exceptions specified by the
15568 constructors/destructors for bases and members, so no
15569 unallowed exception will ever reach this function. By
15570 not creating the EH_SPEC_BLOCK we save a little memory,
15571 and we avoid spurious warnings about unreachable
15573 && !DECL_DEFAULTED_FN (fn
));
15576 /* Store the parameter declarations into the current function declaration.
15577 This is called after parsing the parameter declarations, before
15578 digesting the body of the function.
15580 Also install to binding contour return value identifier, if any. */
15583 store_parm_decls (tree current_function_parms
)
15585 tree fndecl
= current_function_decl
;
15588 /* This is a chain of any other decls that came in among the parm
15589 declarations. If a parm is declared with enum {foo, bar} x;
15590 then CONST_DECLs for foo and bar are put here. */
15591 tree nonparms
= NULL_TREE
;
15593 if (current_function_parms
)
15595 /* This case is when the function was defined with an ANSI prototype.
15596 The parms already have decls, so we need not do anything here
15597 except record them as in effect
15598 and complain if any redundant old-style parm decls were written. */
15600 tree specparms
= current_function_parms
;
15603 /* Must clear this because it might contain TYPE_DECLs declared
15605 current_binding_level
->names
= NULL
;
15607 /* If we're doing semantic analysis, then we'll call pushdecl
15608 for each of these. We must do them in reverse order so that
15609 they end in the correct forward order. */
15610 specparms
= nreverse (specparms
);
15612 for (parm
= specparms
; parm
; parm
= next
)
15614 next
= DECL_CHAIN (parm
);
15615 if (TREE_CODE (parm
) == PARM_DECL
)
15619 /* If we find an enum constant or a type tag,
15620 put it aside for the moment. */
15621 TREE_CHAIN (parm
) = NULL_TREE
;
15622 nonparms
= chainon (nonparms
, parm
);
15626 /* Get the decls in their original chain order and record in the
15627 function. This is all and only the PARM_DECLs that were
15628 pushed into scope by the loop above. */
15629 DECL_ARGUMENTS (fndecl
) = get_local_decls ();
15632 DECL_ARGUMENTS (fndecl
) = NULL_TREE
;
15634 /* Now store the final chain of decls for the arguments
15635 as the decl-chain of the current lexical scope.
15636 Put the enumerators in as well, at the front so that
15637 DECL_ARGUMENTS is not modified. */
15638 current_binding_level
->names
= chainon (nonparms
, DECL_ARGUMENTS (fndecl
));
15640 if (use_eh_spec_block (current_function_decl
))
15641 current_eh_spec_block
= begin_eh_spec_block ();
15645 /* We have finished doing semantic analysis on DECL, but have not yet
15646 generated RTL for its body. Save away our current state, so that
15647 when we want to generate RTL later we know what to do. */
15650 save_function_data (tree decl
)
15652 struct language_function
*f
;
15654 /* Save the language-specific per-function data so that we can
15655 get it back when we really expand this function. */
15656 gcc_assert (!DECL_PENDING_INLINE_P (decl
));
15659 f
= ggc_alloc
<language_function
> ();
15660 memcpy (f
, cp_function_chain
, sizeof (struct language_function
));
15661 DECL_SAVED_FUNCTION_DATA (decl
) = f
;
15663 /* Clear out the bits we don't need. */
15664 f
->base
.x_stmt_tree
.x_cur_stmt_list
= NULL
;
15665 f
->bindings
= NULL
;
15666 f
->base
.local_typedefs
= NULL
;
15670 /* Set the return value of the constructor (if present). */
15673 finish_constructor_body (void)
15678 if (targetm
.cxx
.cdtor_returns_this ())
15680 /* Any return from a constructor will end up here. */
15681 add_stmt (build_stmt (input_location
, LABEL_EXPR
, cdtor_label
));
15683 val
= DECL_ARGUMENTS (current_function_decl
);
15684 val
= build2 (MODIFY_EXPR
, TREE_TYPE (val
),
15685 DECL_RESULT (current_function_decl
), val
);
15686 /* Return the address of the object. */
15687 exprstmt
= build_stmt (input_location
, RETURN_EXPR
, val
);
15688 add_stmt (exprstmt
);
15692 /* Do all the processing for the beginning of a destructor; set up the
15693 vtable pointers and cleanups for bases and members. */
15696 begin_destructor_body (void)
15698 tree compound_stmt
;
15700 /* If the CURRENT_CLASS_TYPE is incomplete, we will have already
15701 issued an error message. We still want to try to process the
15702 body of the function, but initialize_vtbl_ptrs will crash if
15703 TYPE_BINFO is NULL. */
15704 if (COMPLETE_TYPE_P (current_class_type
))
15706 compound_stmt
= begin_compound_stmt (0);
15707 /* Make all virtual function table pointers in non-virtual base
15708 classes point to CURRENT_CLASS_TYPE's virtual function
15710 initialize_vtbl_ptrs (current_class_ptr
);
15711 finish_compound_stmt (compound_stmt
);
15713 if (flag_lifetime_dse
15714 /* Clobbering an empty base is harmful if it overlays real data. */
15715 && !is_empty_class (current_class_type
))
15717 if (sanitize_flags_p (SANITIZE_VPTR
)
15718 && (flag_sanitize_recover
& SANITIZE_VPTR
) == 0
15719 && TYPE_CONTAINS_VPTR_P (current_class_type
))
15721 tree binfo
= TYPE_BINFO (current_class_type
);
15723 = cp_build_fold_indirect_ref (current_class_ptr
);
15725 tree vtbl_ptr
= build_vfield_ref (ref
, TREE_TYPE (binfo
));
15726 tree vtbl
= build_zero_cst (TREE_TYPE (vtbl_ptr
));
15727 tree stmt
= cp_build_modify_expr (input_location
, vtbl_ptr
,
15729 tf_warning_or_error
);
15730 /* If the vptr is shared with some virtual nearly empty base,
15731 don't clear it if not in charge, the dtor of the virtual
15732 nearly empty base will do that later. */
15733 if (CLASSTYPE_VBASECLASSES (current_class_type
)
15734 && CLASSTYPE_PRIMARY_BINFO (current_class_type
)
15736 (CLASSTYPE_PRIMARY_BINFO (current_class_type
)))
15738 stmt
= convert_to_void (stmt
, ICV_STATEMENT
,
15739 tf_warning_or_error
);
15740 stmt
= build_if_in_charge (stmt
);
15742 finish_decl_cleanup (NULL_TREE
, stmt
);
15745 finish_decl_cleanup (NULL_TREE
, build_clobber_this ());
15748 /* And insert cleanups for our bases and members so that they
15749 will be properly destroyed if we throw. */
15750 push_base_cleanups ();
15754 /* At the end of every destructor we generate code to delete the object if
15755 necessary. Do that now. */
15758 finish_destructor_body (void)
15762 /* Any return from a destructor will end up here; that way all base
15763 and member cleanups will be run when the function returns. */
15764 add_stmt (build_stmt (input_location
, LABEL_EXPR
, cdtor_label
));
15766 if (targetm
.cxx
.cdtor_returns_this ())
15770 val
= DECL_ARGUMENTS (current_function_decl
);
15771 val
= build2 (MODIFY_EXPR
, TREE_TYPE (val
),
15772 DECL_RESULT (current_function_decl
), val
);
15773 /* Return the address of the object. */
15774 exprstmt
= build_stmt (input_location
, RETURN_EXPR
, val
);
15775 add_stmt (exprstmt
);
15779 /* Do the necessary processing for the beginning of a function body, which
15780 in this case includes member-initializers, but not the catch clauses of
15781 a function-try-block. Currently, this means opening a binding level
15782 for the member-initializers (in a ctor), member cleanups (in a dtor),
15783 and capture proxies (in a lambda operator()). */
15786 begin_function_body (void)
15790 if (! FUNCTION_NEEDS_BODY_BLOCK (current_function_decl
))
15793 if (processing_template_decl
)
15794 /* Do nothing now. */;
15796 /* Always keep the BLOCK node associated with the outermost pair of
15797 curly braces of a function. These are needed for correct
15798 operation of dwarfout.c. */
15799 keep_next_level (true);
15801 stmt
= begin_compound_stmt (BCS_FN_BODY
);
15803 if (processing_template_decl
)
15804 /* Do nothing now. */;
15805 else if (DECL_DESTRUCTOR_P (current_function_decl
))
15806 begin_destructor_body ();
15811 /* Do the processing for the end of a function body. Currently, this means
15812 closing out the cleanups for fully-constructed bases and members, and in
15813 the case of the destructor, deleting the object if desired. Again, this
15814 is only meaningful for [cd]tors, since they are the only functions where
15815 there is a significant distinction between the main body and any
15816 function catch clauses. Handling, say, main() return semantics here
15817 would be wrong, as flowing off the end of a function catch clause for
15818 main() would also need to return 0. */
15821 finish_function_body (tree compstmt
)
15823 if (compstmt
== NULL_TREE
)
15826 /* Close the block. */
15827 finish_compound_stmt (compstmt
);
15829 if (processing_template_decl
)
15830 /* Do nothing now. */;
15831 else if (DECL_CONSTRUCTOR_P (current_function_decl
))
15832 finish_constructor_body ();
15833 else if (DECL_DESTRUCTOR_P (current_function_decl
))
15834 finish_destructor_body ();
15837 /* Given a function, returns the BLOCK corresponding to the outermost level
15838 of curly braces, skipping the artificial block created for constructor
15842 outer_curly_brace_block (tree fndecl
)
15844 tree block
= DECL_INITIAL (fndecl
);
15845 if (BLOCK_OUTER_CURLY_BRACE_P (block
))
15847 block
= BLOCK_SUBBLOCKS (block
);
15848 if (BLOCK_OUTER_CURLY_BRACE_P (block
))
15850 block
= BLOCK_SUBBLOCKS (block
);
15851 gcc_assert (BLOCK_OUTER_CURLY_BRACE_P (block
));
15855 /* If FNDECL is a class's key method, add the class to the list of
15856 keyed classes that should be emitted. */
15859 record_key_method_defined (tree fndecl
)
15861 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fndecl
)
15862 && DECL_VIRTUAL_P (fndecl
)
15863 && !processing_template_decl
)
15865 tree fnclass
= DECL_CONTEXT (fndecl
);
15866 if (fndecl
== CLASSTYPE_KEY_METHOD (fnclass
))
15867 vec_safe_push (keyed_classes
, fnclass
);
15871 /* Subroutine of finish_function.
15872 Save the body of constexpr functions for possible
15873 future compile time evaluation. */
15876 maybe_save_function_definition (tree fun
)
15878 if (!processing_template_decl
15879 && DECL_DECLARED_CONSTEXPR_P (fun
)
15880 && !cp_function_chain
->invalid_constexpr
15881 && !DECL_CLONED_FUNCTION_P (fun
))
15882 register_constexpr_fundef (fun
, DECL_SAVED_TREE (fun
));
15885 /* Attempt to add a fix-it hint to RICHLOC suggesting the insertion
15886 of "return *this;" immediately before its location, using FNDECL's
15887 first statement (if any) to give the indentation, if appropriate. */
15890 add_return_star_this_fixit (gcc_rich_location
*richloc
, tree fndecl
)
15892 location_t indent
= UNKNOWN_LOCATION
;
15893 tree stmts
= expr_first (DECL_SAVED_TREE (fndecl
));
15895 indent
= EXPR_LOCATION (stmts
);
15896 richloc
->add_fixit_insert_formatted ("return *this;",
15897 richloc
->get_loc (),
15901 /* Finish up a function declaration and compile that function
15902 all the way to assembler language output. The free the storage
15903 for the function definition. INLINE_P is TRUE if we just
15904 finished processing the body of an in-class inline function
15905 definition. (This processing will have taken place after the
15906 class definition is complete.) */
15909 finish_function (bool inline_p
)
15911 tree fndecl
= current_function_decl
;
15912 tree fntype
, ctype
= NULL_TREE
;
15914 /* When we get some parse errors, we can end up without a
15915 current_function_decl, so cope. */
15916 if (fndecl
== NULL_TREE
)
15917 return error_mark_node
;
15919 finish_lambda_scope ();
15921 if (c_dialect_objc ())
15922 objc_finish_function ();
15924 record_key_method_defined (fndecl
);
15926 fntype
= TREE_TYPE (fndecl
);
15928 /* TREE_READONLY (fndecl) = 1;
15929 This caused &foo to be of type ptr-to-const-function
15930 which then got a warning when stored in a ptr-to-function variable. */
15932 gcc_assert (building_stmt_list_p ());
15933 /* The current function is being defined, so its DECL_INITIAL should
15934 be set, and unless there's a multiple definition, it should be
15935 error_mark_node. */
15936 gcc_assert (DECL_INITIAL (fndecl
) == error_mark_node
);
15938 /* For a cloned function, we've already got all the code we need;
15939 there's no need to add any extra bits. */
15940 if (!DECL_CLONED_FUNCTION_P (fndecl
))
15942 /* Make it so that `main' always returns 0 by default. */
15943 if (DECL_MAIN_P (current_function_decl
))
15944 finish_return_stmt (integer_zero_node
);
15946 if (use_eh_spec_block (current_function_decl
))
15947 finish_eh_spec_block (TYPE_RAISES_EXCEPTIONS
15948 (TREE_TYPE (current_function_decl
)),
15949 current_eh_spec_block
);
15952 /* If we're saving up tree structure, tie off the function now. */
15953 DECL_SAVED_TREE (fndecl
) = pop_stmt_list (DECL_SAVED_TREE (fndecl
));
15955 finish_fname_decls ();
15957 /* If this function can't throw any exceptions, remember that. */
15958 if (!processing_template_decl
15959 && !cp_function_chain
->can_throw
15960 && !flag_non_call_exceptions
15961 && !decl_replaceable_p (fndecl
))
15962 TREE_NOTHROW (fndecl
) = 1;
15964 /* This must come after expand_function_end because cleanups might
15965 have declarations (from inline functions) that need to go into
15966 this function's blocks. */
15968 /* If the current binding level isn't the outermost binding level
15969 for this function, either there is a bug, or we have experienced
15970 syntax errors and the statement tree is malformed. */
15971 if (current_binding_level
->kind
!= sk_function_parms
)
15973 /* Make sure we have already experienced errors. */
15974 gcc_assert (errorcount
);
15976 /* Throw away the broken statement tree and extra binding
15978 DECL_SAVED_TREE (fndecl
) = alloc_stmt_list ();
15980 while (current_binding_level
->kind
!= sk_function_parms
)
15982 if (current_binding_level
->kind
== sk_class
)
15983 pop_nested_class ();
15985 poplevel (0, 0, 0);
15988 poplevel (1, 0, 1);
15990 /* Statements should always be full-expressions at the outermost set
15991 of curly braces for a function. */
15992 gcc_assert (stmts_are_full_exprs_p ());
15994 /* If there are no return statements in a function with auto return type,
15995 the return type is void. But if the declared type is something like
15996 auto*, this is an error. */
15997 if (!processing_template_decl
&& FNDECL_USED_AUTO (fndecl
)
15998 && TREE_TYPE (fntype
) == current_function_auto_return_pattern
)
16000 if (is_auto (current_function_auto_return_pattern
))
16002 apply_deduced_return_type (fndecl
, void_type_node
);
16003 fntype
= TREE_TYPE (fndecl
);
16005 else if (!current_function_returns_value
16006 && !current_function_returns_null
)
16008 error ("no return statements in function returning %qT",
16009 current_function_auto_return_pattern
);
16010 inform (input_location
, "only plain %<auto%> return type can be "
16011 "deduced to %<void%>");
16015 // If this is a concept, check that the definition is reasonable.
16016 if (DECL_DECLARED_CONCEPT_P (fndecl
))
16017 check_function_concept (fndecl
);
16019 /* Lambda closure members are implicitly constexpr if possible. */
16020 if (cxx_dialect
>= cxx17
16021 && LAMBDA_TYPE_P (CP_DECL_CONTEXT (fndecl
)))
16022 DECL_DECLARED_CONSTEXPR_P (fndecl
)
16023 = ((processing_template_decl
16024 || is_valid_constexpr_fn (fndecl
, /*complain*/false))
16025 && potential_constant_expression (DECL_SAVED_TREE (fndecl
)));
16027 /* Save constexpr function body before it gets munged by
16028 the NRV transformation. */
16029 maybe_save_function_definition (fndecl
);
16031 /* Invoke the pre-genericize plugin before we start munging things. */
16032 if (!processing_template_decl
)
16033 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE
, fndecl
);
16035 /* Perform delayed folding before NRV transformation. */
16036 if (!processing_template_decl
)
16037 cp_fold_function (fndecl
);
16039 /* Set up the named return value optimization, if we can. Candidate
16040 variables are selected in check_return_expr. */
16041 if (current_function_return_value
)
16043 tree r
= current_function_return_value
;
16046 if (r
!= error_mark_node
16047 /* This is only worth doing for fns that return in memory--and
16048 simpler, since we don't have to worry about promoted modes. */
16049 && aggregate_value_p (TREE_TYPE (TREE_TYPE (fndecl
)), fndecl
)
16050 /* Only allow this for variables declared in the outer scope of
16051 the function so we know that their lifetime always ends with a
16052 return; see g++.dg/opt/nrv6.C. We could be more flexible if
16053 we were to do this optimization in tree-ssa. */
16054 && (outer
= outer_curly_brace_block (fndecl
))
16055 && chain_member (r
, BLOCK_VARS (outer
)))
16056 finalize_nrv (&DECL_SAVED_TREE (fndecl
), r
, DECL_RESULT (fndecl
));
16058 current_function_return_value
= NULL_TREE
;
16061 /* Remember that we were in class scope. */
16062 if (current_class_name
)
16063 ctype
= current_class_type
;
16065 /* Must mark the RESULT_DECL as being in this function. */
16066 DECL_CONTEXT (DECL_RESULT (fndecl
)) = fndecl
;
16068 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
16069 to the FUNCTION_DECL node itself. */
16070 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl
)) = fndecl
;
16072 /* Save away current state, if appropriate. */
16073 if (!processing_template_decl
)
16074 save_function_data (fndecl
);
16076 /* Complain if there's just no return statement. */
16077 if (warn_return_type
16078 && !VOID_TYPE_P (TREE_TYPE (fntype
))
16079 && !dependent_type_p (TREE_TYPE (fntype
))
16080 && !current_function_returns_value
&& !current_function_returns_null
16081 /* Don't complain if we abort or throw. */
16082 && !current_function_returns_abnormally
16083 /* Don't complain if there's an infinite loop. */
16084 && !current_function_infinite_loop
16085 /* Don't complain if we are declared noreturn. */
16086 && !TREE_THIS_VOLATILE (fndecl
)
16087 && !DECL_NAME (DECL_RESULT (fndecl
))
16088 && !TREE_NO_WARNING (fndecl
)
16089 /* Structor return values (if any) are set by the compiler. */
16090 && !DECL_CONSTRUCTOR_P (fndecl
)
16091 && !DECL_DESTRUCTOR_P (fndecl
)
16092 && targetm
.warn_func_return (fndecl
))
16094 gcc_rich_location
richloc (input_location
);
16095 /* Potentially add a "return *this;" fix-it hint for
16096 assignment operators. */
16097 if (IDENTIFIER_ASSIGN_OP_P (DECL_NAME (fndecl
)))
16099 tree valtype
= TREE_TYPE (DECL_RESULT (fndecl
));
16100 if (TREE_CODE (valtype
) == REFERENCE_TYPE
16101 && current_class_ref
16102 && same_type_ignoring_top_level_qualifiers_p
16103 (TREE_TYPE (valtype
), TREE_TYPE (current_class_ref
))
16104 && global_dc
->option_enabled (OPT_Wreturn_type
,
16105 global_dc
->option_state
))
16106 add_return_star_this_fixit (&richloc
, fndecl
);
16108 warning_at (&richloc
, OPT_Wreturn_type
,
16109 "no return statement in function returning non-void");
16110 TREE_NO_WARNING (fndecl
) = 1;
16113 /* Store the end of the function, so that we get good line number
16114 info for the epilogue. */
16115 cfun
->function_end_locus
= input_location
;
16117 /* Complain about parameters that are only set, but never otherwise used. */
16118 if (warn_unused_but_set_parameter
16119 && !processing_template_decl
16120 && errorcount
== unused_but_set_errorcount
16121 && !DECL_CLONED_FUNCTION_P (fndecl
))
16125 for (decl
= DECL_ARGUMENTS (fndecl
);
16127 decl
= DECL_CHAIN (decl
))
16128 if (TREE_USED (decl
)
16129 && TREE_CODE (decl
) == PARM_DECL
16130 && !DECL_READ_P (decl
)
16131 && DECL_NAME (decl
)
16132 && !DECL_ARTIFICIAL (decl
)
16133 && !TREE_NO_WARNING (decl
)
16134 && !DECL_IN_SYSTEM_HEADER (decl
)
16135 && TREE_TYPE (decl
) != error_mark_node
16136 && !TYPE_REF_P (TREE_TYPE (decl
))
16137 && (!CLASS_TYPE_P (TREE_TYPE (decl
))
16138 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl
))))
16139 warning_at (DECL_SOURCE_LOCATION (decl
),
16140 OPT_Wunused_but_set_parameter
,
16141 "parameter %qD set but not used", decl
);
16142 unused_but_set_errorcount
= errorcount
;
16145 /* Complain about locally defined typedefs that are not used in this
16147 maybe_warn_unused_local_typedefs ();
16149 /* Possibly warn about unused parameters. */
16150 if (warn_unused_parameter
16151 && !processing_template_decl
16152 && !DECL_CLONED_FUNCTION_P (fndecl
))
16153 do_warn_unused_parameter (fndecl
);
16155 /* Genericize before inlining. */
16156 if (!processing_template_decl
)
16158 struct language_function
*f
= DECL_SAVED_FUNCTION_DATA (fndecl
);
16159 cp_genericize (fndecl
);
16160 /* Clear out the bits we don't need. */
16161 f
->x_current_class_ptr
= NULL
;
16162 f
->x_current_class_ref
= NULL
;
16163 f
->x_eh_spec_block
= NULL
;
16164 f
->x_in_charge_parm
= NULL
;
16165 f
->x_vtt_parm
= NULL
;
16166 f
->x_return_value
= NULL
;
16167 f
->bindings
= NULL
;
16168 f
->extern_decl_map
= NULL
;
16169 f
->infinite_loops
= NULL
;
16172 /* We're leaving the context of this function, so zap cfun. It's still in
16173 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
16175 current_function_decl
= NULL
;
16177 /* If this is an in-class inline definition, we may have to pop the
16178 bindings for the template parameters that we added in
16179 maybe_begin_member_template_processing when start_function was
16182 maybe_end_member_template_processing ();
16184 /* Leave the scope of the class. */
16186 pop_nested_class ();
16191 current_function_decl
= NULL_TREE
;
16193 invoke_plugin_callbacks (PLUGIN_FINISH_PARSE_FUNCTION
, fndecl
);
16197 /* Create the FUNCTION_DECL for a function definition.
16198 DECLSPECS and DECLARATOR are the parts of the declaration;
16199 they describe the return type and the name of the function,
16200 but twisted together in a fashion that parallels the syntax of C.
16202 This function creates a binding context for the function body
16203 as well as setting up the FUNCTION_DECL in current_function_decl.
16205 Returns a FUNCTION_DECL on success.
16207 If the DECLARATOR is not suitable for a function (it defines a datum
16208 instead), we return 0, which tells yyparse to report a parse error.
16210 May return void_type_node indicating that this method is actually
16211 a friend. See grokfield for more details.
16213 Came here with a `.pushlevel' .
16215 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
16216 CHANGES TO CODE IN `grokfield'. */
16219 grokmethod (cp_decl_specifier_seq
*declspecs
,
16220 const cp_declarator
*declarator
, tree attrlist
)
16222 tree fndecl
= grokdeclarator (declarator
, declspecs
, MEMFUNCDEF
, 0,
16225 if (fndecl
== error_mark_node
)
16226 return error_mark_node
;
16228 if (fndecl
== NULL
|| TREE_CODE (fndecl
) != FUNCTION_DECL
)
16230 error ("invalid member function declaration");
16231 return error_mark_node
;
16235 cplus_decl_attributes (&fndecl
, attrlist
, 0);
16237 /* Pass friends other than inline friend functions back. */
16238 if (fndecl
== void_type_node
)
16241 if (DECL_IN_AGGR_P (fndecl
))
16243 if (DECL_CLASS_SCOPE_P (fndecl
))
16244 error ("%qD is already defined in class %qT", fndecl
,
16245 DECL_CONTEXT (fndecl
));
16246 return error_mark_node
;
16249 check_template_shadow (fndecl
);
16251 if (TREE_PUBLIC (fndecl
))
16252 DECL_COMDAT (fndecl
) = 1;
16253 DECL_DECLARED_INLINE_P (fndecl
) = 1;
16254 DECL_NO_INLINE_WARNING_P (fndecl
) = 1;
16256 /* We process method specializations in finish_struct_1. */
16257 if (processing_template_decl
&& !DECL_TEMPLATE_SPECIALIZATION (fndecl
))
16259 fndecl
= push_template_decl (fndecl
);
16260 if (fndecl
== error_mark_node
)
16264 if (! DECL_FRIEND_P (fndecl
))
16266 if (DECL_CHAIN (fndecl
))
16268 fndecl
= copy_node (fndecl
);
16269 TREE_CHAIN (fndecl
) = NULL_TREE
;
16273 cp_finish_decl (fndecl
, NULL_TREE
, false, NULL_TREE
, 0);
16275 DECL_IN_AGGR_P (fndecl
) = 1;
16280 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
16281 we can lay it out later, when and if its type becomes complete.
16283 Also handle constexpr variables where the initializer involves
16284 an unlowered PTRMEM_CST because the class isn't complete yet. */
16287 maybe_register_incomplete_var (tree var
)
16289 gcc_assert (VAR_P (var
));
16291 /* Keep track of variables with incomplete types. */
16292 if (!processing_template_decl
&& TREE_TYPE (var
) != error_mark_node
16293 && DECL_EXTERNAL (var
))
16295 tree inner_type
= TREE_TYPE (var
);
16297 while (TREE_CODE (inner_type
) == ARRAY_TYPE
)
16298 inner_type
= TREE_TYPE (inner_type
);
16299 inner_type
= TYPE_MAIN_VARIANT (inner_type
);
16301 if ((!COMPLETE_TYPE_P (inner_type
) && CLASS_TYPE_P (inner_type
))
16302 /* RTTI TD entries are created while defining the type_info. */
16303 || (TYPE_LANG_SPECIFIC (inner_type
)
16304 && TYPE_BEING_DEFINED (inner_type
)))
16306 incomplete_var iv
= {var
, inner_type
};
16307 vec_safe_push (incomplete_vars
, iv
);
16309 else if (!(DECL_LANG_SPECIFIC (var
) && DECL_TEMPLATE_INFO (var
))
16310 && decl_constant_var_p (var
)
16311 && (TYPE_PTRMEM_P (inner_type
) || CLASS_TYPE_P (inner_type
)))
16313 /* When the outermost open class is complete we can resolve any
16314 pointers-to-members. */
16315 tree context
= outermost_open_class ();
16316 incomplete_var iv
= {var
, context
};
16317 vec_safe_push (incomplete_vars
, iv
);
16322 /* Called when a class type (given by TYPE) is defined. If there are
16323 any existing VAR_DECLs whose type has been completed by this
16324 declaration, update them now. */
16327 complete_vars (tree type
)
16330 incomplete_var
*iv
;
16332 for (ix
= 0; vec_safe_iterate (incomplete_vars
, ix
, &iv
); )
16334 if (same_type_p (type
, iv
->incomplete_type
))
16336 tree var
= iv
->decl
;
16337 tree type
= TREE_TYPE (var
);
16339 if (type
!= error_mark_node
16340 && (TYPE_MAIN_VARIANT (strip_array_types (type
))
16341 == iv
->incomplete_type
))
16343 /* Complete the type of the variable. The VAR_DECL itself
16344 will be laid out in expand_expr. */
16345 complete_type (type
);
16346 cp_apply_type_quals_to_decl (cp_type_quals (type
), var
);
16349 /* Remove this entry from the list. */
16350 incomplete_vars
->unordered_remove (ix
);
16356 /* Check for pending declarations which may have abstract type. */
16357 complete_type_check_abstract (type
);
16360 /* If DECL is of a type which needs a cleanup, build and return an
16361 expression to perform that cleanup here. Return NULL_TREE if no
16362 cleanup need be done. DECL can also be a _REF when called from
16363 split_nonconstant_init_1. */
16366 cxx_maybe_build_cleanup (tree decl
, tsubst_flags_t complain
)
16372 /* Assume no cleanup is required. */
16373 cleanup
= NULL_TREE
;
16375 if (error_operand_p (decl
))
16378 /* Handle "__attribute__((cleanup))". We run the cleanup function
16379 before the destructor since the destructor is what actually
16380 terminates the lifetime of the object. */
16382 attr
= lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl
));
16391 /* Get the name specified by the user for the cleanup function. */
16392 id
= TREE_VALUE (TREE_VALUE (attr
));
16393 /* Look up the name to find the cleanup function to call. It is
16394 important to use lookup_name here because that is what is
16395 used in c-common.c:handle_cleanup_attribute when performing
16396 initial checks on the attribute. Note that those checks
16397 include ensuring that the function found is not an overloaded
16398 function, or an object with an overloaded call operator,
16399 etc.; we can rely on the fact that the function found is an
16400 ordinary FUNCTION_DECL. */
16401 fn
= lookup_name (id
);
16402 arg
= build_address (decl
);
16403 if (!mark_used (decl
, complain
) && !(complain
& tf_error
))
16404 return error_mark_node
;
16405 cleanup
= cp_build_function_call_nary (fn
, complain
, arg
, NULL_TREE
);
16406 if (cleanup
== error_mark_node
)
16407 return error_mark_node
;
16409 /* Handle ordinary C++ destructors. */
16410 type
= TREE_TYPE (decl
);
16411 if (type_build_dtor_call (type
))
16413 int flags
= LOOKUP_NORMAL
|LOOKUP_NONVIRTUAL
|LOOKUP_DESTRUCTOR
;
16417 if (TREE_CODE (type
) == ARRAY_TYPE
)
16420 addr
= build_address (decl
);
16422 call
= build_delete (TREE_TYPE (addr
), addr
,
16423 sfk_complete_destructor
, flags
, 0, complain
);
16424 if (call
== error_mark_node
)
16425 cleanup
= error_mark_node
;
16426 else if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type
))
16427 /* Discard the call. */;
16429 cleanup
= cp_build_compound_expr (cleanup
, call
, complain
);
16434 /* build_delete sets the location of the destructor call to the
16435 current location, even though the destructor is going to be
16436 called later, at the end of the current scope. This can lead to
16437 a "jumpy" behavior for users of debuggers when they step around
16438 the end of the block. So let's unset the location of the
16439 destructor call instead. */
16440 protected_set_expr_location (cleanup
, UNKNOWN_LOCATION
);
16444 && !lookup_attribute ("warn_unused", TYPE_ATTRIBUTES (TREE_TYPE (decl
)))
16445 /* Treat objects with destructors as used; the destructor may do
16446 something substantive. */
16447 && !mark_used (decl
, complain
) && !(complain
& tf_error
))
16448 return error_mark_node
;
16454 /* Return the FUNCTION_TYPE that corresponds to MEMFNTYPE, which can be a
16455 FUNCTION_DECL, METHOD_TYPE, FUNCTION_TYPE, pointer or reference to
16456 METHOD_TYPE or FUNCTION_TYPE, or pointer to member function. */
16459 static_fn_type (tree memfntype
)
16464 if (TYPE_PTRMEMFUNC_P (memfntype
))
16465 memfntype
= TYPE_PTRMEMFUNC_FN_TYPE (memfntype
);
16466 if (INDIRECT_TYPE_P (memfntype
)
16467 || TREE_CODE (memfntype
) == FUNCTION_DECL
)
16468 memfntype
= TREE_TYPE (memfntype
);
16469 if (TREE_CODE (memfntype
) == FUNCTION_TYPE
)
16471 gcc_assert (TREE_CODE (memfntype
) == METHOD_TYPE
);
16472 args
= TYPE_ARG_TYPES (memfntype
);
16473 fntype
= build_function_type (TREE_TYPE (memfntype
), TREE_CHAIN (args
));
16474 fntype
= apply_memfn_quals (fntype
, type_memfn_quals (memfntype
));
16475 fntype
= (cp_build_type_attribute_variant
16476 (fntype
, TYPE_ATTRIBUTES (memfntype
)));
16477 fntype
= cxx_copy_lang_qualifiers (fntype
, memfntype
);
16481 /* DECL was originally constructed as a non-static member function,
16482 but turned out to be static. Update it accordingly. */
16485 revert_static_member_fn (tree decl
)
16487 tree stype
= static_fn_type (decl
);
16488 cp_cv_quals quals
= type_memfn_quals (stype
);
16489 cp_ref_qualifier rqual
= type_memfn_rqual (stype
);
16491 if (quals
!= TYPE_UNQUALIFIED
|| rqual
!= REF_QUAL_NONE
)
16492 stype
= apply_memfn_quals (stype
, TYPE_UNQUALIFIED
, REF_QUAL_NONE
);
16494 TREE_TYPE (decl
) = stype
;
16496 if (DECL_ARGUMENTS (decl
))
16497 DECL_ARGUMENTS (decl
) = DECL_CHAIN (DECL_ARGUMENTS (decl
));
16498 DECL_STATIC_FUNCTION_P (decl
) = 1;
16501 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
16502 one of the language-independent trees. */
16504 enum cp_tree_node_structure_enum
16505 cp_tree_node_structure (union lang_tree_node
* t
)
16507 switch (TREE_CODE (&t
->generic
))
16509 case DEFAULT_ARG
: return TS_CP_DEFAULT_ARG
;
16510 case DEFERRED_NOEXCEPT
: return TS_CP_DEFERRED_NOEXCEPT
;
16511 case IDENTIFIER_NODE
: return TS_CP_IDENTIFIER
;
16512 case OVERLOAD
: return TS_CP_OVERLOAD
;
16513 case TEMPLATE_PARM_INDEX
: return TS_CP_TPI
;
16514 case PTRMEM_CST
: return TS_CP_PTRMEM
;
16515 case BASELINK
: return TS_CP_BASELINK
;
16516 case TEMPLATE_DECL
: return TS_CP_TEMPLATE_DECL
;
16517 case STATIC_ASSERT
: return TS_CP_STATIC_ASSERT
;
16518 case ARGUMENT_PACK_SELECT
: return TS_CP_ARGUMENT_PACK_SELECT
;
16519 case TRAIT_EXPR
: return TS_CP_TRAIT_EXPR
;
16520 case LAMBDA_EXPR
: return TS_CP_LAMBDA_EXPR
;
16521 case TEMPLATE_INFO
: return TS_CP_TEMPLATE_INFO
;
16522 case CONSTRAINT_INFO
: return TS_CP_CONSTRAINT_INFO
;
16523 case USERDEF_LITERAL
: return TS_CP_USERDEF_LITERAL
;
16524 default: return TS_CP_GENERIC
;
16528 /* Build the void_list_node (void_type_node having been created). */
16530 build_void_list_node (void)
16532 tree t
= build_tree_list (NULL_TREE
, void_type_node
);
16537 cp_missing_noreturn_ok_p (tree decl
)
16539 /* A missing noreturn is ok for the `main' function. */
16540 return DECL_MAIN_P (decl
);
16543 /* Return the decl used to identify the COMDAT group into which DECL should
16547 cxx_comdat_group (tree decl
)
16549 /* Virtual tables, construction virtual tables, and virtual table
16550 tables all go in a single COMDAT group, named after the primary
16552 if (VAR_P (decl
) && DECL_VTABLE_OR_VTT_P (decl
))
16553 decl
= CLASSTYPE_VTABLES (DECL_CONTEXT (decl
));
16554 /* For all other DECLs, the COMDAT group is the mangled name of the
16555 declaration itself. */
16558 while (DECL_THUNK_P (decl
))
16560 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
16561 into the same section as the target function. In that case
16562 we must return target's name. */
16563 tree target
= THUNK_TARGET (decl
);
16564 if (TARGET_USE_LOCAL_THUNK_ALIAS_P (target
)
16565 && DECL_SECTION_NAME (target
) != NULL
16566 && DECL_ONE_ONLY (target
))
16576 /* Returns the return type for FN as written by the user, which may include
16577 a placeholder for a deduced return type. */
16580 fndecl_declared_return_type (tree fn
)
16582 fn
= STRIP_TEMPLATE (fn
);
16583 if (FNDECL_USED_AUTO (fn
))
16585 struct language_function
*f
= NULL
;
16586 if (DECL_STRUCT_FUNCTION (fn
))
16587 f
= DECL_STRUCT_FUNCTION (fn
)->language
;
16589 f
= DECL_SAVED_FUNCTION_DATA (fn
);
16590 return f
->x_auto_return_pattern
;
16592 return TREE_TYPE (TREE_TYPE (fn
));
16595 /* Returns true iff DECL is a variable or function declared with an auto type
16596 that has not yet been deduced to a real type. */
16599 undeduced_auto_decl (tree decl
)
16601 if (cxx_dialect
< cxx11
)
16603 STRIP_ANY_LOCATION_WRAPPER (decl
);
16604 return ((VAR_OR_FUNCTION_DECL_P (decl
)
16605 || TREE_CODE (decl
) == TEMPLATE_DECL
)
16606 && type_uses_auto (TREE_TYPE (decl
)));
16609 /* Complain if DECL has an undeduced return type. */
16612 require_deduced_type (tree decl
, tsubst_flags_t complain
)
16614 if (undeduced_auto_decl (decl
))
16616 if (complain
& tf_error
)
16617 error ("use of %qD before deduction of %<auto%>", decl
);
16623 /* Create a representation of the explicit-specifier with
16624 constant-expression of EXPR. COMPLAIN is as for tsubst. */
16627 build_explicit_specifier (tree expr
, tsubst_flags_t complain
)
16629 if (processing_template_decl
&& value_dependent_expression_p (expr
))
16630 /* Wait for instantiation, tsubst_function_decl will handle it. */
16633 expr
= build_converted_constant_expr (boolean_type_node
, expr
, complain
);
16634 expr
= instantiate_non_dependent_expr (expr
);
16635 expr
= cxx_constant_value (expr
);
16639 #include "gt-cp-decl.h"