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 int member_function_or_else (tree
, tree
, enum overload_flags
);
75 static tree
local_variable_p_walkfn (tree
*, int *, void *);
76 static const char *tag_name (enum tag_types
);
77 static tree
lookup_and_check_tag (enum tag_types
, tree
, tag_scope
, bool);
78 static void maybe_deduce_size_from_array_init (tree
, tree
);
79 static void layout_var_decl (tree
);
80 static tree
check_initializer (tree
, tree
, int, vec
<tree
, va_gc
> **);
81 static void make_rtl_for_nonlocal_decl (tree
, tree
, const char *);
82 static void copy_type_enum (tree
, tree
);
83 static void check_function_type (tree
, tree
);
84 static void finish_constructor_body (void);
85 static void begin_destructor_body (void);
86 static void finish_destructor_body (void);
87 static void record_key_method_defined (tree
);
88 static tree
create_array_type_for_decl (tree
, tree
, tree
, location_t
);
89 static tree
get_atexit_node (void);
90 static tree
get_dso_handle_node (void);
91 static tree
start_cleanup_fn (void);
92 static void end_cleanup_fn (void);
93 static tree
cp_make_fname_decl (location_t
, tree
, int);
94 static void initialize_predefined_identifiers (void);
95 static tree check_special_function_return_type
96 (special_function_kind
, tree
, tree
, int, const location_t
*);
97 static tree
push_cp_library_fn (enum tree_code
, tree
, int);
98 static tree
build_cp_library_fn (tree
, enum tree_code
, tree
, int);
99 static void store_parm_decls (tree
);
100 static void initialize_local_var (tree
, tree
);
101 static void expand_static_init (tree
, tree
);
102 static location_t
smallest_type_location (const cp_decl_specifier_seq
*);
104 /* The following symbols are subsumed in the cp_global_trees array, and
105 listed here individually for documentation purposes.
108 tree wchar_decl_node;
110 tree vtable_entry_type;
111 tree delta_type_node;
112 tree __t_desc_type_node;
114 tree class_type_node;
115 tree unknown_type_node;
117 Array type `vtable_entry_type[]'
120 tree vtbl_ptr_type_node;
127 A FUNCTION_DECL which can call `abort'. Not necessarily the
128 one that the user will declare, but sufficient to be called
129 by routines that want to abort the program.
134 tree type_info_type_node, tinfo_decl_id, tinfo_decl_type;
135 tree tinfo_var_id; */
137 tree cp_global_trees
[CPTI_MAX
];
139 /* A list of objects which have constructors or destructors
140 which reside in the global scope. The decl is stored in
141 the TREE_VALUE slot and the initializer is stored
142 in the TREE_PURPOSE slot. */
143 tree static_aggregates
;
145 /* Like static_aggregates, but for thread_local variables. */
150 /* A node for the integer constant 2. */
152 tree integer_two_node
;
154 /* vector of static decls. */
155 vec
<tree
, va_gc
> *static_decls
;
157 /* vector of keyed classes. */
158 vec
<tree
, va_gc
> *keyed_classes
;
160 /* Used only for jumps to as-yet undefined labels, since jumps to
161 defined labels can have their validity checked immediately. */
163 struct GTY((chain_next ("%h.next"))) named_label_use_entry
{
164 struct named_label_use_entry
*next
;
165 /* The binding level to which this entry is *currently* attached.
166 This is initially the binding level in which the goto appeared,
167 but is modified as scopes are closed. */
168 cp_binding_level
*binding_level
;
169 /* The head of the names list that was current when the goto appeared,
170 or the inner scope popped. These are the decls that will *not* be
171 skipped when jumping to the label. */
173 /* The location of the goto, for error reporting. */
174 location_t o_goto_locus
;
175 /* True if an OpenMP structured block scope has been closed since
176 the goto appeared. This means that the branch from the label will
177 illegally exit an OpenMP scope. */
181 /* A list of all LABEL_DECLs in the function that have names. Here so
182 we can clear out their names' definitions at the end of the
183 function, and so we can check the validity of jumps to these labels. */
185 struct GTY((for_user
)) named_label_entry
{
187 tree name
; /* Name of decl. */
189 tree label_decl
; /* LABEL_DECL, unless deleted local label. */
191 named_label_entry
*outer
; /* Outer shadowed chain. */
193 /* The binding level to which the label is *currently* attached.
194 This is initially set to the binding level in which the label
195 is defined, but is modified as scopes are closed. */
196 cp_binding_level
*binding_level
;
198 /* The head of the names list that was current when the label was
199 defined, or the inner scope popped. These are the decls that will
200 be skipped when jumping to the label. */
203 /* A vector of all decls from all binding levels that would be
204 crossed by a backward branch to the label. */
205 vec
<tree
, va_gc
> *bad_decls
;
207 /* A list of uses of the label, before the label is defined. */
208 named_label_use_entry
*uses
;
210 /* The following bits are set after the label is defined, and are
211 updated as scopes are popped. They indicate that a jump to the
212 label will illegally enter a scope of the given flavor. */
216 bool in_transaction_scope
;
217 bool in_constexpr_if
;
220 #define named_labels cp_function_chain->x_named_labels
222 /* The number of function bodies which we are currently processing.
223 (Zero if we are at namespace scope, one inside the body of a
224 function, two inside the body of a function in a local class, etc.) */
227 /* Whether the exception-specifier is part of a function type (i.e. C++17). */
228 bool flag_noexcept_type
;
230 /* States indicating how grokdeclarator() should handle declspecs marked
231 with __attribute__((deprecated)). An object declared as
232 __attribute__((deprecated)) suppresses warnings of uses of other
234 enum deprecated_states deprecated_state
= DEPRECATED_NORMAL
;
237 /* A list of VAR_DECLs whose type was incomplete at the time the
238 variable was declared. */
240 struct GTY(()) incomplete_var
{
242 tree incomplete_type
;
246 static GTY(()) vec
<incomplete_var
, va_gc
> *incomplete_vars
;
248 /* Returns the kind of template specialization we are currently
249 processing, given that it's declaration contained N_CLASS_SCOPES
250 explicit scope qualifications. */
253 current_tmpl_spec_kind (int n_class_scopes
)
255 int n_template_parm_scopes
= 0;
256 int seen_specialization_p
= 0;
257 int innermost_specialization_p
= 0;
260 /* Scan through the template parameter scopes. */
261 for (b
= current_binding_level
;
262 b
->kind
== sk_template_parms
;
265 /* If we see a specialization scope inside a parameter scope,
266 then something is wrong. That corresponds to a declaration
269 template <class T> template <> ...
271 which is always invalid since [temp.expl.spec] forbids the
272 specialization of a class member template if the enclosing
273 class templates are not explicitly specialized as well. */
274 if (b
->explicit_spec_p
)
276 if (n_template_parm_scopes
== 0)
277 innermost_specialization_p
= 1;
279 seen_specialization_p
= 1;
281 else if (seen_specialization_p
== 1)
282 return tsk_invalid_member_spec
;
284 ++n_template_parm_scopes
;
287 /* Handle explicit instantiations. */
288 if (processing_explicit_instantiation
)
290 if (n_template_parm_scopes
!= 0)
291 /* We've seen a template parameter list during an explicit
292 instantiation. For example:
294 template <class T> template void f(int);
296 This is erroneous. */
297 return tsk_invalid_expl_inst
;
299 return tsk_expl_inst
;
302 if (n_template_parm_scopes
< n_class_scopes
)
303 /* We've not seen enough template headers to match all the
304 specialized classes present. For example:
306 template <class T> void R<T>::S<T>::f(int);
308 This is invalid; there needs to be one set of template
309 parameters for each class. */
310 return tsk_insufficient_parms
;
311 else if (n_template_parm_scopes
== n_class_scopes
)
312 /* We're processing a non-template declaration (even though it may
313 be a member of a template class.) For example:
315 template <class T> void S<T>::f(int);
317 The `class T' matches the `S<T>', leaving no template headers
318 corresponding to the `f'. */
320 else if (n_template_parm_scopes
> n_class_scopes
+ 1)
321 /* We've got too many template headers. For example:
323 template <> template <class T> void f (T);
325 There need to be more enclosing classes. */
326 return tsk_excessive_parms
;
328 /* This must be a template. It's of the form:
330 template <class T> template <class U> void S<T>::f(U);
332 This is a specialization if the innermost level was a
333 specialization; otherwise it's just a definition of the
335 return innermost_specialization_p
? tsk_expl_spec
: tsk_template
;
338 /* Exit the current scope. */
346 /* When a label goes out of scope, check to see if that label was used
347 in a valid manner, and issue any appropriate warnings or errors. */
350 check_label_used (tree label
)
352 if (!processing_template_decl
)
354 if (DECL_INITIAL (label
) == NULL_TREE
)
358 error ("label %q+D used but not defined", label
);
359 location
= input_location
;
360 /* FIXME want (LOCATION_FILE (input_location), (line)0) */
361 /* Avoid crashing later. */
362 define_label (location
, DECL_NAME (label
));
365 warn_for_unused_label (label
);
369 /* Helper function to sort named label entries in a vector by DECL_UID. */
372 sort_labels (const void *a
, const void *b
)
374 tree label1
= *(tree
const *) a
;
375 tree label2
= *(tree
const *) b
;
377 /* DECL_UIDs can never be equal. */
378 return DECL_UID (label1
) > DECL_UID (label2
) ? -1 : +1;
381 /* At the end of a function, all labels declared within the function
382 go out of scope. BLOCK is the top-level block for the
386 pop_labels (tree block
)
391 /* We need to add the labels to the block chain, so debug
392 information is emitted. But, we want the order to be stable so
393 need to sort them first. Otherwise the debug output could be
394 randomly ordered. I guess it's mostly stable, unless the hash
395 table implementation changes. */
396 auto_vec
<tree
, 32> labels (named_labels
->elements ());
397 hash_table
<named_label_hash
>::iterator
end (named_labels
->end ());
398 for (hash_table
<named_label_hash
>::iterator iter
399 (named_labels
->begin ()); iter
!= end
; ++iter
)
401 named_label_entry
*ent
= *iter
;
403 gcc_checking_assert (!ent
->outer
);
405 labels
.quick_push (ent
->label_decl
);
409 labels
.qsort (sort_labels
);
411 while (labels
.length ())
413 tree label
= labels
.pop ();
415 DECL_CHAIN (label
) = BLOCK_VARS (block
);
416 BLOCK_VARS (block
) = label
;
418 check_label_used (label
);
422 /* At the end of a block with local labels, restore the outer definition. */
425 pop_local_label (tree id
, tree label
)
427 check_label_used (label
);
428 named_label_entry
**slot
= named_labels
->find_slot_with_hash
429 (id
, IDENTIFIER_HASH_VALUE (id
), NO_INSERT
);
430 named_label_entry
*ent
= *slot
;
436 ent
= ggc_cleared_alloc
<named_label_entry
> ();
442 /* The following two routines are used to interface to Objective-C++.
443 The binding level is purposely treated as an opaque type. */
446 objc_get_current_scope (void)
448 return current_binding_level
;
451 /* The following routine is used by the NeXT-style SJLJ exceptions;
452 variables get marked 'volatile' so as to not be clobbered by
453 _setjmp()/_longjmp() calls. All variables in the current scope,
454 as well as parent scopes up to (but not including) ENCLOSING_BLK
455 shall be thusly marked. */
458 objc_mark_locals_volatile (void *enclosing_blk
)
460 cp_binding_level
*scope
;
462 for (scope
= current_binding_level
;
463 scope
&& scope
!= enclosing_blk
;
464 scope
= scope
->level_chain
)
468 for (decl
= scope
->names
; decl
; decl
= TREE_CHAIN (decl
))
469 objc_volatilize_decl (decl
);
471 /* Do not climb up past the current function. */
472 if (scope
->kind
== sk_function_parms
)
477 /* True if B is the level for the condition of a constexpr if. */
480 level_for_constexpr_if (cp_binding_level
*b
)
482 return (b
->kind
== sk_cond
&& b
->this_entity
483 && TREE_CODE (b
->this_entity
) == IF_STMT
484 && IF_STMT_CONSTEXPR_P (b
->this_entity
));
487 /* Update data for defined and undefined labels when leaving a scope. */
490 poplevel_named_label_1 (named_label_entry
**slot
, cp_binding_level
*bl
)
492 named_label_entry
*ent
= *slot
;
493 cp_binding_level
*obl
= bl
->level_chain
;
495 if (ent
->binding_level
== bl
)
499 /* ENT->NAMES_IN_SCOPE may contain a mixture of DECLs and
500 TREE_LISTs representing OVERLOADs, so be careful. */
501 for (decl
= ent
->names_in_scope
; decl
; decl
= (DECL_P (decl
)
503 : TREE_CHAIN (decl
)))
504 if (decl_jump_unsafe (decl
))
505 vec_safe_push (ent
->bad_decls
, decl
);
507 ent
->binding_level
= obl
;
508 ent
->names_in_scope
= obl
->names
;
512 ent
->in_try_scope
= true;
515 ent
->in_catch_scope
= true;
518 ent
->in_omp_scope
= true;
521 ent
->in_transaction_scope
= true;
524 if (level_for_constexpr_if (bl
->level_chain
))
525 ent
->in_constexpr_if
= true;
533 struct named_label_use_entry
*use
;
535 for (use
= ent
->uses
; use
; use
= use
->next
)
536 if (use
->binding_level
== bl
)
538 use
->binding_level
= obl
;
539 use
->names_in_scope
= obl
->names
;
540 if (bl
->kind
== sk_omp
)
541 use
->in_omp_scope
= true;
548 /* Saved errorcount to avoid -Wunused-but-set-{parameter,variable} warnings
549 when errors were reported, except for -Werror-unused-but-set-*. */
550 static int unused_but_set_errorcount
;
552 /* Exit a binding level.
553 Pop the level off, and restore the state of the identifier-decl mappings
554 that were in effect when this level was entered.
556 If KEEP == 1, this level had explicit declarations, so
557 and create a "block" (a BLOCK node) for the level
558 to record its declarations and subblocks for symbol table output.
560 If FUNCTIONBODY is nonzero, this level is the body of a function,
561 so create a block as if KEEP were set and also clear out all
564 If REVERSE is nonzero, reverse the order of decls before putting
565 them into the BLOCK. */
568 poplevel (int keep
, int reverse
, int functionbody
)
571 /* The chain of decls was accumulated in reverse order.
572 Put it into forward order, just for cleanliness. */
579 bool subtime
= timevar_cond_start (TV_NAME_LOOKUP
);
584 gcc_assert (current_binding_level
->kind
!= sk_class
585 && current_binding_level
->kind
!= sk_namespace
);
587 if (current_binding_level
->kind
== sk_cleanup
)
589 subblocks
= functionbody
>= 0 ? current_binding_level
->blocks
: 0;
591 gcc_assert (!vec_safe_length (current_binding_level
->class_shadowed
));
593 /* We used to use KEEP == 2 to indicate that the new block should go
594 at the beginning of the list of blocks at this binding level,
595 rather than the end. This hack is no longer used. */
596 gcc_assert (keep
== 0 || keep
== 1);
598 if (current_binding_level
->keep
)
601 /* Any uses of undefined labels, and any defined labels, now operate
602 under constraints of next binding contour. */
603 if (cfun
&& !functionbody
&& named_labels
)
604 named_labels
->traverse
<cp_binding_level
*, poplevel_named_label_1
>
605 (current_binding_level
);
607 /* Get the decls in the order they were written.
608 Usually current_binding_level->names is in reverse order.
609 But parameter decls were previously put in forward order. */
611 decls
= current_binding_level
->names
;
614 decls
= nreverse (decls
);
615 current_binding_level
->names
= decls
;
618 /* If there were any declarations or structure tags in that level,
619 or if this level is a function body,
620 create a BLOCK to record them for the life of this function. */
622 /* Avoid function body block if possible. */
623 if (functionbody
&& subblocks
&& BLOCK_CHAIN (subblocks
) == NULL_TREE
)
625 else if (keep
== 1 || functionbody
)
626 block
= make_node (BLOCK
);
627 if (block
!= NULL_TREE
)
629 BLOCK_VARS (block
) = decls
;
630 BLOCK_SUBBLOCKS (block
) = subblocks
;
633 /* In each subblock, record that this is its superior. */
635 for (link
= subblocks
; link
; link
= BLOCK_CHAIN (link
))
636 BLOCK_SUPERCONTEXT (link
) = block
;
638 /* Before we remove the declarations first check for unused variables. */
639 if ((warn_unused_variable
|| warn_unused_but_set_variable
)
640 && current_binding_level
->kind
!= sk_template_parms
641 && !processing_template_decl
)
642 for (tree d
= get_local_decls (); d
; d
= TREE_CHAIN (d
))
644 /* There are cases where D itself is a TREE_LIST. See in
645 push_local_binding where the list of decls returned by
646 getdecls is built. */
647 decl
= TREE_CODE (d
) == TREE_LIST
? TREE_VALUE (d
) : d
;
649 tree type
= TREE_TYPE (decl
);
651 && (! TREE_USED (decl
) || !DECL_READ_P (decl
))
652 && ! DECL_IN_SYSTEM_HEADER (decl
)
653 /* For structured bindings, consider only real variables, not
655 && (DECL_DECOMPOSITION_P (decl
) ? !DECL_DECOMP_BASE (decl
)
656 : (DECL_NAME (decl
) && !DECL_ARTIFICIAL (decl
)))
657 && type
!= error_mark_node
658 && (!CLASS_TYPE_P (type
)
659 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type
)
660 || lookup_attribute ("warn_unused",
661 TYPE_ATTRIBUTES (TREE_TYPE (decl
)))))
663 if (! TREE_USED (decl
))
665 if (!DECL_NAME (decl
) && DECL_DECOMPOSITION_P (decl
))
666 warning_at (DECL_SOURCE_LOCATION (decl
),
667 OPT_Wunused_variable
,
668 "unused structured binding declaration");
670 warning_at (DECL_SOURCE_LOCATION (decl
),
671 OPT_Wunused_variable
, "unused variable %qD", decl
);
673 else if (DECL_CONTEXT (decl
) == current_function_decl
674 // For -Wunused-but-set-variable leave references alone.
675 && !TYPE_REF_P (TREE_TYPE (decl
))
676 && errorcount
== unused_but_set_errorcount
)
678 if (!DECL_NAME (decl
) && DECL_DECOMPOSITION_P (decl
))
679 warning_at (DECL_SOURCE_LOCATION (decl
),
680 OPT_Wunused_but_set_variable
, "structured "
681 "binding declaration set but not used");
683 warning_at (DECL_SOURCE_LOCATION (decl
),
684 OPT_Wunused_but_set_variable
,
685 "variable %qD set but not used", decl
);
686 unused_but_set_errorcount
= errorcount
;
691 /* Remove declarations for all the DECLs in this level. */
692 for (link
= decls
; link
; link
= TREE_CHAIN (link
))
694 decl
= TREE_CODE (link
) == TREE_LIST
? TREE_VALUE (link
) : link
;
695 tree name
= OVL_NAME (decl
);
697 /* Remove the binding. */
698 if (TREE_CODE (decl
) == LABEL_DECL
)
699 pop_local_label (name
, decl
);
701 pop_local_binding (name
, decl
);
704 /* Restore the IDENTIFIER_TYPE_VALUEs. */
705 for (link
= current_binding_level
->type_shadowed
;
706 link
; link
= TREE_CHAIN (link
))
707 SET_IDENTIFIER_TYPE_VALUE (TREE_PURPOSE (link
), TREE_VALUE (link
));
709 /* There may be OVERLOADs (wrapped in TREE_LISTs) on the BLOCK_VARs
710 list if a `using' declaration put them there. The debugging
711 back ends won't understand OVERLOAD, so we remove them here.
712 Because the BLOCK_VARS are (temporarily) shared with
713 CURRENT_BINDING_LEVEL->NAMES we must do this fixup after we have
714 popped all the bindings. Also remove undeduced 'auto' decls,
715 which LTO doesn't understand, and can't have been used by anything. */
720 for (d
= &BLOCK_VARS (block
); *d
; )
722 if (TREE_CODE (*d
) == TREE_LIST
723 || (!processing_template_decl
724 && undeduced_auto_decl (*d
)))
725 *d
= TREE_CHAIN (*d
);
727 d
= &DECL_CHAIN (*d
);
731 /* If the level being exited is the top level of a function,
732 check over all the labels. */
737 /* Since this is the top level block of a function, the vars are
738 the function's parameters. Don't leave them in the BLOCK
739 because they are found in the FUNCTION_DECL instead. */
740 BLOCK_VARS (block
) = 0;
744 pop_labels (subblocks
);
747 kind
= current_binding_level
->kind
;
748 if (kind
== sk_cleanup
)
752 /* If this is a temporary binding created for a cleanup, then we'll
753 have pushed a statement list level. Pop that, create a new
754 BIND_EXPR for the block, and insert it into the stream. */
755 stmt
= pop_stmt_list (current_binding_level
->statement_list
);
756 stmt
= c_build_bind_expr (input_location
, block
, stmt
);
763 /* The current function is being defined, so its DECL_INITIAL
764 should be error_mark_node. */
765 gcc_assert (DECL_INITIAL (current_function_decl
) == error_mark_node
);
766 DECL_INITIAL (current_function_decl
) = block
? block
: subblocks
;
769 if (FUNCTION_NEEDS_BODY_BLOCK (current_function_decl
))
771 if (BLOCK_SUBBLOCKS (subblocks
))
772 BLOCK_OUTER_CURLY_BRACE_P (BLOCK_SUBBLOCKS (subblocks
)) = 1;
775 BLOCK_OUTER_CURLY_BRACE_P (subblocks
) = 1;
779 current_binding_level
->blocks
780 = block_chainon (current_binding_level
->blocks
, block
);
782 /* If we did not make a block for the level just exited,
783 any blocks made for inner levels
784 (since they cannot be recorded as subblocks in that level)
785 must be carried forward so they will later become subblocks
786 of something else. */
788 current_binding_level
->blocks
789 = block_chainon (current_binding_level
->blocks
, subblocks
);
791 /* Each and every BLOCK node created here in `poplevel' is important
792 (e.g. for proper debugging information) so if we created one
793 earlier, mark it as "used". */
795 TREE_USED (block
) = 1;
797 /* All temporary bindings created for cleanups are popped silently. */
798 if (kind
== sk_cleanup
)
801 timevar_cond_stop (TV_NAME_LOOKUP
, subtime
);
805 /* Call wrapup_globals_declarations for the globals in NAMESPACE. */
806 /* Diagnose odr-used extern inline variables without definitions
807 in the current TU. */
810 wrapup_namespace_globals ()
812 if (vec
<tree
, va_gc
> *statics
= static_decls
)
816 FOR_EACH_VEC_ELT (*statics
, i
, decl
)
818 if (warn_unused_function
819 && TREE_CODE (decl
) == FUNCTION_DECL
820 && DECL_INITIAL (decl
) == 0
821 && DECL_EXTERNAL (decl
)
822 && !TREE_PUBLIC (decl
)
823 && !DECL_ARTIFICIAL (decl
)
824 && !DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl
)
825 && !TREE_NO_WARNING (decl
))
826 warning_at (DECL_SOURCE_LOCATION (decl
),
827 OPT_Wunused_function
,
828 "%qF declared %<static%> but never defined", decl
);
831 && DECL_EXTERNAL (decl
)
832 && DECL_INLINE_VAR_P (decl
)
833 && DECL_ODR_USED (decl
))
834 error_at (DECL_SOURCE_LOCATION (decl
),
835 "odr-used inline variable %qD is not defined", decl
);
838 /* Clear out the list, so we don't rescan next time. */
841 /* Write out any globals that need to be output. */
842 return wrapup_global_declarations (statics
->address (),
848 /* In C++, you don't have to write `struct S' to refer to `S'; you
849 can just use `S'. We accomplish this by creating a TYPE_DECL as
850 if the user had written `typedef struct S S'. Create and return
851 the TYPE_DECL for TYPE. */
854 create_implicit_typedef (tree name
, tree type
)
858 decl
= build_decl (input_location
, TYPE_DECL
, name
, type
);
859 DECL_ARTIFICIAL (decl
) = 1;
860 /* There are other implicit type declarations, like the one *within*
861 a class that allows you to write `S::S'. We must distinguish
863 SET_DECL_IMPLICIT_TYPEDEF_P (decl
);
864 TYPE_NAME (type
) = decl
;
865 TYPE_STUB_DECL (type
) = decl
;
870 /* Function-scope local entities that need discriminators. Each entry
871 is a {decl,name} pair. VAR_DECLs for anon unions get their name
872 smashed, so we cannot rely on DECL_NAME. */
874 static GTY((deletable
)) vec
<tree
, va_gc
> *local_entities
;
876 /* Determine the mangling discriminator of local DECL. There are
877 generally very few of these in any particular function. */
880 determine_local_discriminator (tree decl
)
882 bool subtime
= timevar_cond_start (TV_NAME_LOOKUP
);
883 retrofit_lang_decl (decl
);
884 tree ctx
= DECL_CONTEXT (decl
);
885 tree name
= (TREE_CODE (decl
) == TYPE_DECL
886 && TYPE_UNNAMED_P (TREE_TYPE (decl
))
887 ? NULL_TREE
: DECL_NAME (decl
));
888 size_t nelts
= vec_safe_length (local_entities
);
889 for (size_t i
= 0; i
< nelts
; i
+= 2)
891 tree
*pair
= &(*local_entities
)[i
];
894 gcc_checking_assert (d
!= decl
);
896 && TREE_CODE (decl
) == TREE_CODE (d
)
897 && ctx
== DECL_CONTEXT (d
))
899 tree disc
= integer_one_node
;
900 if (DECL_DISCRIMINATOR (d
))
901 disc
= build_int_cst (TREE_TYPE (disc
),
902 TREE_INT_CST_LOW (DECL_DISCRIMINATOR (d
)) + 1);
903 DECL_DISCRIMINATOR (decl
) = disc
;
904 /* Replace the saved decl. */
913 vec_safe_reserve (local_entities
, 2);
914 local_entities
->quick_push (decl
);
915 local_entities
->quick_push (name
);
918 timevar_cond_stop (TV_NAME_LOOKUP
, subtime
);
923 /* Returns true if functions FN1 and FN2 have equivalent trailing
927 function_requirements_equivalent_p (tree newfn
, tree oldfn
)
929 /* In the concepts TS, the combined constraints are compared. */
930 if (cxx_dialect
< cxx2a
)
932 tree ci1
= get_constraints (oldfn
);
933 tree ci2
= get_constraints (newfn
);
934 tree req1
= ci1
? CI_ASSOCIATED_CONSTRAINTS (ci1
) : NULL_TREE
;
935 tree req2
= ci2
? CI_ASSOCIATED_CONSTRAINTS (ci2
) : NULL_TREE
;
936 return cp_tree_equal (req1
, req2
);
939 /* Compare only trailing requirements. */
940 tree reqs1
= get_trailing_function_requirements (newfn
);
941 tree reqs2
= get_trailing_function_requirements (oldfn
);
942 if ((reqs1
!= NULL_TREE
) != (reqs2
!= NULL_TREE
))
944 return cp_tree_equal (reqs1
, reqs2
);
947 /* Subroutine of duplicate_decls: return truthvalue of whether
948 or not types of these decls match.
950 For C++, we must compare the parameter list so that `int' can match
951 `int&' in a parameter position, but `int&' is not confused with
955 decls_match (tree newdecl
, tree olddecl
, bool record_versions
/* = true */)
959 if (newdecl
== olddecl
)
962 if (TREE_CODE (newdecl
) != TREE_CODE (olddecl
))
963 /* If the two DECLs are not even the same kind of thing, we're not
964 interested in their types. */
967 gcc_assert (DECL_P (newdecl
));
969 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
971 tree f1
= TREE_TYPE (newdecl
);
972 tree f2
= TREE_TYPE (olddecl
);
973 tree p1
= TYPE_ARG_TYPES (f1
);
974 tree p2
= TYPE_ARG_TYPES (f2
);
977 /* Specializations of different templates are different functions
978 even if they have the same type. */
979 tree t1
= (DECL_USE_TEMPLATE (newdecl
)
980 ? DECL_TI_TEMPLATE (newdecl
)
982 tree t2
= (DECL_USE_TEMPLATE (olddecl
)
983 ? DECL_TI_TEMPLATE (olddecl
)
988 if (CP_DECL_CONTEXT (newdecl
) != CP_DECL_CONTEXT (olddecl
)
989 && ! (DECL_EXTERN_C_P (newdecl
)
990 && DECL_EXTERN_C_P (olddecl
)))
993 /* A new declaration doesn't match a built-in one unless it
994 is also extern "C". */
995 if (DECL_IS_BUILTIN (olddecl
)
996 && DECL_EXTERN_C_P (olddecl
) && !DECL_EXTERN_C_P (newdecl
))
999 if (TREE_CODE (f1
) != TREE_CODE (f2
))
1002 /* A declaration with deduced return type should use its pre-deduction
1003 type for declaration matching. */
1004 r2
= fndecl_declared_return_type (olddecl
);
1006 if (same_type_p (TREE_TYPE (f1
), r2
))
1008 if (!prototype_p (f2
) && DECL_EXTERN_C_P (olddecl
)
1009 && fndecl_built_in_p (olddecl
))
1011 types_match
= self_promoting_args_p (p1
);
1012 if (p1
== void_list_node
)
1013 TREE_TYPE (newdecl
) = TREE_TYPE (olddecl
);
1018 && type_memfn_rqual (f1
) == type_memfn_rqual (f2
)
1019 && (TYPE_ATTRIBUTES (TREE_TYPE (newdecl
)) == NULL_TREE
1020 || comp_type_attributes (TREE_TYPE (newdecl
),
1021 TREE_TYPE (olddecl
)) != 0);
1026 /* Two function declarations match if either has a requires-clause
1027 then both have a requires-clause and their constraints-expressions
1029 if (types_match
&& flag_concepts
)
1030 types_match
= function_requirements_equivalent_p (newdecl
, olddecl
);
1032 /* The decls dont match if they correspond to two different versions
1033 of the same function. Disallow extern "C" functions to be
1034 versions for now. */
1036 && !DECL_EXTERN_C_P (newdecl
)
1037 && !DECL_EXTERN_C_P (olddecl
)
1039 && maybe_version_functions (newdecl
, olddecl
,
1040 (!DECL_FUNCTION_VERSIONED (newdecl
)
1041 || !DECL_FUNCTION_VERSIONED (olddecl
))))
1044 else if (TREE_CODE (newdecl
) == TEMPLATE_DECL
)
1046 if (!template_heads_equivalent_p (newdecl
, olddecl
))
1049 tree oldres
= DECL_TEMPLATE_RESULT (olddecl
);
1050 tree newres
= DECL_TEMPLATE_RESULT (newdecl
);
1052 if (TREE_CODE (newres
) != TREE_CODE (oldres
))
1055 /* Two template types match if they are the same. Otherwise, compare
1056 the underlying declarations. */
1057 if (TREE_CODE (newres
) == TYPE_DECL
)
1058 types_match
= same_type_p (TREE_TYPE (newres
), TREE_TYPE (oldres
));
1060 types_match
= decls_match (newres
, oldres
);
1064 /* Need to check scope for variable declaration (VAR_DECL).
1065 For typedef (TYPE_DECL), scope is ignored. */
1067 && CP_DECL_CONTEXT (newdecl
) != CP_DECL_CONTEXT (olddecl
)
1069 Two declarations for an object with C language linkage
1070 with the same name (ignoring the namespace that qualify
1071 it) that appear in different namespace scopes refer to
1073 && !(DECL_EXTERN_C_P (olddecl
) && DECL_EXTERN_C_P (newdecl
)))
1076 if (TREE_TYPE (newdecl
) == error_mark_node
)
1077 types_match
= TREE_TYPE (olddecl
) == error_mark_node
;
1078 else if (TREE_TYPE (olddecl
) == NULL_TREE
)
1079 types_match
= TREE_TYPE (newdecl
) == NULL_TREE
;
1080 else if (TREE_TYPE (newdecl
) == NULL_TREE
)
1083 types_match
= comptypes (TREE_TYPE (newdecl
),
1084 TREE_TYPE (olddecl
),
1085 COMPARE_REDECLARATION
);
1091 /* NEWDECL and OLDDECL have identical signatures. If they are
1092 different versions adjust them and return true.
1093 If RECORD is set to true, record function versions. */
1096 maybe_version_functions (tree newdecl
, tree olddecl
, bool record
)
1098 if (!targetm
.target_option
.function_versions (newdecl
, olddecl
))
1101 if (!DECL_FUNCTION_VERSIONED (olddecl
))
1103 DECL_FUNCTION_VERSIONED (olddecl
) = 1;
1104 if (DECL_ASSEMBLER_NAME_SET_P (olddecl
))
1105 mangle_decl (olddecl
);
1108 if (!DECL_FUNCTION_VERSIONED (newdecl
))
1110 DECL_FUNCTION_VERSIONED (newdecl
) = 1;
1111 if (DECL_ASSEMBLER_NAME_SET_P (newdecl
))
1112 mangle_decl (newdecl
);
1116 cgraph_node::record_function_versions (olddecl
, newdecl
);
1121 /* If NEWDECL is `static' and an `extern' was seen previously,
1122 warn about it. OLDDECL is the previous declaration.
1124 Note that this does not apply to the C++ case of declaring
1125 a variable `extern const' and then later `const'.
1127 Don't complain about built-in functions, since they are beyond
1128 the user's control. */
1131 warn_extern_redeclared_static (tree newdecl
, tree olddecl
)
1133 if (TREE_CODE (newdecl
) == TYPE_DECL
1134 || TREE_CODE (newdecl
) == TEMPLATE_DECL
1135 || TREE_CODE (newdecl
) == CONST_DECL
1136 || TREE_CODE (newdecl
) == NAMESPACE_DECL
)
1139 /* Don't get confused by static member functions; that's a different
1141 if (TREE_CODE (newdecl
) == FUNCTION_DECL
1142 && DECL_STATIC_FUNCTION_P (newdecl
))
1145 /* If the old declaration was `static', or the new one isn't, then
1146 everything is OK. */
1147 if (DECL_THIS_STATIC (olddecl
) || !DECL_THIS_STATIC (newdecl
))
1150 /* It's OK to declare a builtin function as `static'. */
1151 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1152 && DECL_ARTIFICIAL (olddecl
))
1155 auto_diagnostic_group d
;
1156 if (permerror (DECL_SOURCE_LOCATION (newdecl
),
1157 "%qD was declared %<extern%> and later %<static%>", newdecl
))
1158 inform (DECL_SOURCE_LOCATION (olddecl
),
1159 "previous declaration of %qD", olddecl
);
1162 /* NEW_DECL is a redeclaration of OLD_DECL; both are functions or
1163 function templates. If their exception specifications do not
1164 match, issue a diagnostic. */
1167 check_redeclaration_exception_specification (tree new_decl
,
1170 tree new_exceptions
= TYPE_RAISES_EXCEPTIONS (TREE_TYPE (new_decl
));
1171 tree old_exceptions
= TYPE_RAISES_EXCEPTIONS (TREE_TYPE (old_decl
));
1173 /* Two default specs are equivalent, don't force evaluation. */
1174 if (UNEVALUATED_NOEXCEPT_SPEC_P (new_exceptions
)
1175 && UNEVALUATED_NOEXCEPT_SPEC_P (old_exceptions
))
1178 if (!type_dependent_expression_p (old_decl
))
1180 maybe_instantiate_noexcept (new_decl
);
1181 maybe_instantiate_noexcept (old_decl
);
1183 new_exceptions
= TYPE_RAISES_EXCEPTIONS (TREE_TYPE (new_decl
));
1184 old_exceptions
= TYPE_RAISES_EXCEPTIONS (TREE_TYPE (old_decl
));
1188 If any declaration of a function has an exception-specification,
1189 all declarations, including the definition and an explicit
1190 specialization, of that function shall have an
1191 exception-specification with the same set of type-ids. */
1192 if (! DECL_IS_BUILTIN (old_decl
)
1193 && !comp_except_specs (new_exceptions
, old_exceptions
, ce_normal
))
1195 const char *const msg
1196 = G_("declaration of %qF has a different exception specifier");
1197 bool complained
= true;
1198 location_t new_loc
= DECL_SOURCE_LOCATION (new_decl
);
1199 auto_diagnostic_group d
;
1200 if (DECL_IN_SYSTEM_HEADER (old_decl
))
1201 complained
= pedwarn (new_loc
, OPT_Wsystem_headers
, msg
, new_decl
);
1202 else if (!flag_exceptions
)
1203 /* We used to silently permit mismatched eh specs with
1204 -fno-exceptions, so make them a pedwarn now. */
1205 complained
= pedwarn (new_loc
, OPT_Wpedantic
, msg
, new_decl
);
1207 error_at (new_loc
, msg
, new_decl
);
1209 inform (DECL_SOURCE_LOCATION (old_decl
),
1210 "from previous declaration %qF", old_decl
);
1214 /* Return true if OLD_DECL and NEW_DECL agree on constexprness.
1215 Otherwise issue diagnostics. */
1218 validate_constexpr_redeclaration (tree old_decl
, tree new_decl
)
1220 old_decl
= STRIP_TEMPLATE (old_decl
);
1221 new_decl
= STRIP_TEMPLATE (new_decl
);
1222 if (!VAR_OR_FUNCTION_DECL_P (old_decl
)
1223 || !VAR_OR_FUNCTION_DECL_P (new_decl
))
1225 if (DECL_DECLARED_CONSTEXPR_P (old_decl
)
1226 == DECL_DECLARED_CONSTEXPR_P (new_decl
))
1228 if (TREE_CODE (old_decl
) == FUNCTION_DECL
)
1230 if (fndecl_built_in_p (old_decl
))
1232 /* Hide a built-in declaration. */
1233 DECL_DECLARED_CONSTEXPR_P (old_decl
)
1234 = DECL_DECLARED_CONSTEXPR_P (new_decl
);
1237 /* 7.1.5 [dcl.constexpr]
1238 Note: An explicit specialization can differ from the template
1239 declaration with respect to the constexpr specifier. */
1240 if (! DECL_TEMPLATE_SPECIALIZATION (old_decl
)
1241 && DECL_TEMPLATE_SPECIALIZATION (new_decl
))
1244 error_at (DECL_SOURCE_LOCATION (new_decl
),
1245 "redeclaration %qD differs in %<constexpr%> "
1246 "from previous declaration", new_decl
);
1247 inform (DECL_SOURCE_LOCATION (old_decl
),
1248 "previous declaration %qD", old_decl
);
1254 // If OLDDECL and NEWDECL are concept declarations with the same type
1255 // (i.e., and template parameters), but different requirements,
1256 // emit diagnostics and return true. Otherwise, return false.
1258 check_concept_refinement (tree olddecl
, tree newdecl
)
1260 if (!DECL_DECLARED_CONCEPT_P (olddecl
) || !DECL_DECLARED_CONCEPT_P (newdecl
))
1263 tree d1
= DECL_TEMPLATE_RESULT (olddecl
);
1264 tree d2
= DECL_TEMPLATE_RESULT (newdecl
);
1265 if (TREE_CODE (d1
) != TREE_CODE (d2
))
1268 tree t1
= TREE_TYPE (d1
);
1269 tree t2
= TREE_TYPE (d2
);
1270 if (TREE_CODE (d1
) == FUNCTION_DECL
)
1272 if (compparms (TYPE_ARG_TYPES (t1
), TYPE_ARG_TYPES (t2
))
1273 && comp_template_parms (DECL_TEMPLATE_PARMS (olddecl
),
1274 DECL_TEMPLATE_PARMS (newdecl
))
1275 && !equivalently_constrained (olddecl
, newdecl
))
1277 error ("cannot specialize concept %q#D", olddecl
);
1284 /* DECL is a redeclaration of a function or function template. If
1285 it does have default arguments issue a diagnostic. Note: this
1286 function is used to enforce the requirements in C++11 8.3.6 about
1287 no default arguments in redeclarations. */
1290 check_redeclaration_no_default_args (tree decl
)
1292 gcc_assert (DECL_DECLARES_FUNCTION_P (decl
));
1294 for (tree t
= FUNCTION_FIRST_USER_PARMTYPE (decl
);
1295 t
&& t
!= void_list_node
; t
= TREE_CHAIN (t
))
1296 if (TREE_PURPOSE (t
))
1298 permerror (DECL_SOURCE_LOCATION (decl
),
1299 "redeclaration of %q#D may not have default "
1305 /* NEWDECL is a redeclaration of a function or function template OLDDECL,
1306 in any case represented as FUNCTION_DECLs (the DECL_TEMPLATE_RESULTs of
1307 the TEMPLATE_DECLs in case of function templates). This function is used
1308 to enforce the final part of C++17 11.3.6/4, about a single declaration:
1309 "If a friend declaration specifies a default argument expression, that
1310 declaration shall be a definition and shall be the only declaration of
1311 the function or function template in the translation unit." */
1314 check_no_redeclaration_friend_default_args (tree olddecl
, tree newdecl
,
1315 bool olddecl_hidden_friend_p
)
1317 if (!olddecl_hidden_friend_p
&& !DECL_FRIEND_P (newdecl
))
1320 tree t1
= FUNCTION_FIRST_USER_PARMTYPE (olddecl
);
1321 tree t2
= FUNCTION_FIRST_USER_PARMTYPE (newdecl
);
1323 for (; t1
&& t1
!= void_list_node
;
1324 t1
= TREE_CHAIN (t1
), t2
= TREE_CHAIN (t2
))
1325 if ((olddecl_hidden_friend_p
&& TREE_PURPOSE (t1
))
1326 || (DECL_FRIEND_P (newdecl
) && TREE_PURPOSE (t2
)))
1328 auto_diagnostic_group d
;
1329 if (permerror (DECL_SOURCE_LOCATION (newdecl
),
1330 "friend declaration of %q#D specifies default "
1331 "arguments and isn%'t the only declaration", newdecl
))
1332 inform (DECL_SOURCE_LOCATION (olddecl
),
1333 "previous declaration of %q#D", olddecl
);
1338 /* Merge tree bits that correspond to attributes noreturn, nothrow,
1339 const, malloc, and pure from NEWDECL with those of OLDDECL. */
1342 merge_attribute_bits (tree newdecl
, tree olddecl
)
1344 TREE_THIS_VOLATILE (newdecl
) |= TREE_THIS_VOLATILE (olddecl
);
1345 TREE_THIS_VOLATILE (olddecl
) |= TREE_THIS_VOLATILE (newdecl
);
1346 TREE_NOTHROW (newdecl
) |= TREE_NOTHROW (olddecl
);
1347 TREE_NOTHROW (olddecl
) |= TREE_NOTHROW (newdecl
);
1348 TREE_READONLY (newdecl
) |= TREE_READONLY (olddecl
);
1349 TREE_READONLY (olddecl
) |= TREE_READONLY (newdecl
);
1350 DECL_IS_MALLOC (newdecl
) |= DECL_IS_MALLOC (olddecl
);
1351 DECL_IS_MALLOC (olddecl
) |= DECL_IS_MALLOC (newdecl
);
1352 DECL_PURE_P (newdecl
) |= DECL_PURE_P (olddecl
);
1353 DECL_PURE_P (olddecl
) |= DECL_PURE_P (newdecl
);
1354 DECL_UNINLINABLE (newdecl
) |= DECL_UNINLINABLE (olddecl
);
1355 DECL_UNINLINABLE (olddecl
) |= DECL_UNINLINABLE (newdecl
);
1358 #define GNU_INLINE_P(fn) (DECL_DECLARED_INLINE_P (fn) \
1359 && lookup_attribute ("gnu_inline", \
1360 DECL_ATTRIBUTES (fn)))
1362 /* A subroutine of duplicate_decls. Emits a diagnostic when newdecl
1363 ambiguates olddecl. Returns true if an error occurs. */
1366 duplicate_function_template_decls (tree newdecl
, tree olddecl
)
1369 tree newres
= DECL_TEMPLATE_RESULT (newdecl
);
1370 tree oldres
= DECL_TEMPLATE_RESULT (olddecl
);
1371 /* Function template declarations can be differentiated by parameter
1373 if (compparms (TYPE_ARG_TYPES (TREE_TYPE (oldres
)),
1374 TYPE_ARG_TYPES (TREE_TYPE (newres
)))
1375 && same_type_p (TREE_TYPE (TREE_TYPE (newdecl
)),
1376 TREE_TYPE (TREE_TYPE (olddecl
))))
1378 /* ... and also by their template-heads and requires-clauses. */
1379 if (template_heads_equivalent_p (newdecl
, olddecl
)
1380 && function_requirements_equivalent_p (newres
, oldres
))
1382 error ("ambiguating new declaration %q+#D", newdecl
);
1383 inform (DECL_SOURCE_LOCATION (olddecl
),
1384 "old declaration %q#D", olddecl
);
1388 /* FIXME: The types are the same but the are differences
1389 in either the template heads or function requirements.
1390 We should be able to diagnose a set of common errors
1391 stemming from these declarations. For example:
1393 template<typename T> requires C void f(...);
1394 template<typename T> void f(...) requires C;
1396 These are functionally equivalent but not equivalent. */
1402 /* If NEWDECL is a redeclaration of OLDDECL, merge the declarations.
1403 If the redeclaration is invalid, a diagnostic is issued, and the
1404 error_mark_node is returned. Otherwise, OLDDECL is returned.
1406 If NEWDECL is not a redeclaration of OLDDECL, NULL_TREE is
1409 NEWDECL_IS_FRIEND is true if NEWDECL was declared as a friend. */
1412 duplicate_decls (tree newdecl
, tree olddecl
, bool newdecl_is_friend
)
1414 unsigned olddecl_uid
= DECL_UID (olddecl
);
1415 int olddecl_friend
= 0, types_match
= 0, hidden_friend
= 0;
1416 int olddecl_hidden_friend
= 0;
1417 int new_defines_function
= 0;
1418 tree new_template_info
;
1419 location_t olddecl_loc
= DECL_SOURCE_LOCATION (olddecl
);
1420 location_t newdecl_loc
= DECL_SOURCE_LOCATION (newdecl
);
1422 if (newdecl
== olddecl
)
1425 types_match
= decls_match (newdecl
, olddecl
);
1427 /* If either the type of the new decl or the type of the old decl is an
1428 error_mark_node, then that implies that we have already issued an
1429 error (earlier) for some bogus type specification, and in that case,
1430 it is rather pointless to harass the user with yet more error message
1431 about the same declaration, so just pretend the types match here. */
1432 if (TREE_TYPE (newdecl
) == error_mark_node
1433 || TREE_TYPE (olddecl
) == error_mark_node
)
1434 return error_mark_node
;
1436 /* Check for redeclaration and other discrepancies. */
1437 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1438 && DECL_ARTIFICIAL (olddecl
))
1440 gcc_assert (!DECL_HIDDEN_FRIEND_P (olddecl
));
1441 if (TREE_CODE (newdecl
) != FUNCTION_DECL
)
1443 /* Avoid warnings redeclaring built-ins which have not been
1444 explicitly declared. */
1445 if (DECL_ANTICIPATED (olddecl
))
1447 if (TREE_PUBLIC (newdecl
)
1448 && CP_DECL_CONTEXT (newdecl
) == global_namespace
)
1449 warning_at (newdecl_loc
,
1450 OPT_Wbuiltin_declaration_mismatch
,
1451 "built-in function %qD declared as non-function",
1456 /* If you declare a built-in or predefined function name as static,
1457 the old definition is overridden, but optionally warn this was a
1458 bad choice of name. */
1459 if (! TREE_PUBLIC (newdecl
))
1461 warning_at (newdecl_loc
,
1463 fndecl_built_in_p (olddecl
)
1464 ? G_("shadowing built-in function %q#D")
1465 : G_("shadowing library function %q#D"), olddecl
);
1466 /* Discard the old built-in function. */
1469 /* If the built-in is not ansi, then programs can override
1470 it even globally without an error. */
1471 else if (! fndecl_built_in_p (olddecl
))
1472 warning_at (newdecl_loc
, 0,
1473 "library function %q#D redeclared as non-function %q#D",
1476 error_at (newdecl_loc
,
1477 "declaration of %q#D conflicts with built-in "
1478 "declaration %q#D", newdecl
, olddecl
);
1481 else if (DECL_OMP_DECLARE_REDUCTION_P (olddecl
))
1483 gcc_assert (DECL_OMP_DECLARE_REDUCTION_P (newdecl
));
1484 error_at (newdecl_loc
,
1485 "redeclaration of %<pragma omp declare reduction%>");
1486 inform (olddecl_loc
,
1487 "previous %<pragma omp declare reduction%> declaration");
1488 return error_mark_node
;
1490 else if (!types_match
)
1492 /* Avoid warnings redeclaring built-ins which have not been
1493 explicitly declared. */
1494 if (DECL_ANTICIPATED (olddecl
))
1498 /* A new declaration doesn't match a built-in one unless it
1499 is also extern "C". */
1500 gcc_assert (DECL_IS_BUILTIN (olddecl
));
1501 gcc_assert (DECL_EXTERN_C_P (olddecl
));
1502 if (!DECL_EXTERN_C_P (newdecl
))
1505 for (t1
= TYPE_ARG_TYPES (TREE_TYPE (newdecl
)),
1506 t2
= TYPE_ARG_TYPES (TREE_TYPE (olddecl
));
1508 t1
= TREE_CHAIN (t1
), t2
= TREE_CHAIN (t2
))
1512 /* FILE, tm types are not known at the time
1513 we create the builtins. */
1514 for (unsigned i
= 0;
1515 i
< sizeof (builtin_structptr_types
)
1516 / sizeof (builtin_structptr_type
);
1518 if (TREE_VALUE (t2
) == builtin_structptr_types
[i
].node
)
1520 tree t
= TREE_VALUE (t1
);
1523 && TYPE_IDENTIFIER (TREE_TYPE (t
))
1524 == get_identifier (builtin_structptr_types
[i
].str
)
1525 && compparms (TREE_CHAIN (t1
), TREE_CHAIN (t2
)))
1527 tree oldargs
= TYPE_ARG_TYPES (TREE_TYPE (olddecl
));
1529 TYPE_ARG_TYPES (TREE_TYPE (olddecl
))
1530 = TYPE_ARG_TYPES (TREE_TYPE (newdecl
));
1531 types_match
= decls_match (newdecl
, olddecl
);
1533 return duplicate_decls (newdecl
, olddecl
,
1535 TYPE_ARG_TYPES (TREE_TYPE (olddecl
)) = oldargs
;
1540 if (! same_type_p (TREE_VALUE (t1
), TREE_VALUE (t2
)))
1545 warning_at (newdecl_loc
,
1546 OPT_Wbuiltin_declaration_mismatch
,
1547 "declaration of %q#D conflicts with built-in "
1548 "declaration %q#D", newdecl
, olddecl
);
1550 else if ((DECL_EXTERN_C_P (newdecl
)
1551 && DECL_EXTERN_C_P (olddecl
))
1552 || compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl
)),
1553 TYPE_ARG_TYPES (TREE_TYPE (olddecl
))))
1555 /* Don't really override olddecl for __* prefixed builtins
1556 except for __[^b]*_chk, the compiler might be using those
1558 if (fndecl_built_in_p (olddecl
))
1560 tree id
= DECL_NAME (olddecl
);
1561 const char *name
= IDENTIFIER_POINTER (id
);
1566 && (strncmp (name
+ 2, "builtin_",
1567 strlen ("builtin_")) == 0
1568 || (len
= strlen (name
)) <= strlen ("___chk")
1569 || memcmp (name
+ len
- strlen ("_chk"),
1570 "_chk", strlen ("_chk") + 1) != 0))
1572 if (DECL_INITIAL (newdecl
))
1574 error_at (newdecl_loc
,
1575 "definition of %q#D ambiguates built-in "
1576 "declaration %q#D", newdecl
, olddecl
);
1577 return error_mark_node
;
1579 auto_diagnostic_group d
;
1580 if (permerror (newdecl_loc
,
1581 "new declaration %q#D ambiguates built-in"
1582 " declaration %q#D", newdecl
, olddecl
)
1584 inform (newdecl_loc
,
1585 "ignoring the %q#D declaration", newdecl
);
1586 return flag_permissive
? olddecl
: error_mark_node
;
1590 /* A near match; override the builtin. */
1592 if (TREE_PUBLIC (newdecl
))
1593 warning_at (newdecl_loc
,
1594 OPT_Wbuiltin_declaration_mismatch
,
1595 "new declaration %q#D ambiguates built-in "
1596 "declaration %q#D", newdecl
, olddecl
);
1598 warning (OPT_Wshadow
,
1599 fndecl_built_in_p (olddecl
)
1600 ? G_("shadowing built-in function %q#D")
1601 : G_("shadowing library function %q#D"), olddecl
);
1604 /* Discard the old built-in function. */
1607 /* Replace the old RTL to avoid problems with inlining. */
1608 COPY_DECL_RTL (newdecl
, olddecl
);
1610 /* Even if the types match, prefer the new declarations type for
1611 built-ins which have not been explicitly declared, for
1612 exception lists, etc... */
1613 else if (DECL_IS_BUILTIN (olddecl
))
1615 tree type
= TREE_TYPE (newdecl
);
1616 tree attribs
= (*targetm
.merge_type_attributes
)
1617 (TREE_TYPE (olddecl
), type
);
1619 type
= cp_build_type_attribute_variant (type
, attribs
);
1620 TREE_TYPE (newdecl
) = TREE_TYPE (olddecl
) = type
;
1623 /* If a function is explicitly declared "throw ()", propagate that to
1624 the corresponding builtin. */
1625 if (DECL_BUILT_IN_CLASS (olddecl
) == BUILT_IN_NORMAL
1626 && DECL_ANTICIPATED (olddecl
)
1627 && TREE_NOTHROW (newdecl
)
1628 && !TREE_NOTHROW (olddecl
))
1630 enum built_in_function fncode
= DECL_FUNCTION_CODE (olddecl
);
1631 tree tmpdecl
= builtin_decl_explicit (fncode
);
1632 if (tmpdecl
&& tmpdecl
!= olddecl
&& types_match
)
1633 TREE_NOTHROW (tmpdecl
) = 1;
1636 /* Whether or not the builtin can throw exceptions has no
1637 bearing on this declarator. */
1638 TREE_NOTHROW (olddecl
) = 0;
1640 if (DECL_THIS_STATIC (newdecl
) && !DECL_THIS_STATIC (olddecl
))
1642 /* If a builtin function is redeclared as `static', merge
1643 the declarations, but make the original one static. */
1644 DECL_THIS_STATIC (olddecl
) = 1;
1645 TREE_PUBLIC (olddecl
) = 0;
1647 /* Make the old declaration consistent with the new one so
1648 that all remnants of the builtin-ness of this function
1649 will be banished. */
1650 SET_DECL_LANGUAGE (olddecl
, DECL_LANGUAGE (newdecl
));
1651 COPY_DECL_RTL (newdecl
, olddecl
);
1654 else if (TREE_CODE (olddecl
) != TREE_CODE (newdecl
))
1656 /* C++ Standard, 3.3, clause 4:
1657 "[Note: a namespace name or a class template name must be unique
1658 in its declarative region (7.3.2, clause 14). ]" */
1659 if (TREE_CODE (olddecl
) == NAMESPACE_DECL
1660 || TREE_CODE (newdecl
) == NAMESPACE_DECL
)
1661 /* Namespace conflicts with not namespace. */;
1662 else if (DECL_TYPE_TEMPLATE_P (olddecl
)
1663 || DECL_TYPE_TEMPLATE_P (newdecl
))
1664 /* Class template conflicts. */;
1665 else if ((TREE_CODE (newdecl
) == FUNCTION_DECL
1666 && DECL_FUNCTION_TEMPLATE_P (olddecl
))
1667 || (TREE_CODE (olddecl
) == FUNCTION_DECL
1668 && DECL_FUNCTION_TEMPLATE_P (newdecl
)))
1670 /* One is a function and the other is a template
1672 if (!UDLIT_OPER_P (DECL_NAME (newdecl
)))
1675 /* There can only be one! */
1676 if (TREE_CODE (newdecl
) == TEMPLATE_DECL
1677 && check_raw_literal_operator (olddecl
))
1678 error_at (newdecl_loc
,
1679 "literal operator %q#D conflicts with"
1680 " raw literal operator", newdecl
);
1681 else if (check_raw_literal_operator (newdecl
))
1682 error_at (newdecl_loc
,
1683 "raw literal operator %q#D conflicts with"
1684 " literal operator template", newdecl
);
1688 inform (olddecl_loc
, "previous declaration %q#D", olddecl
);
1689 return error_mark_node
;
1691 else if (DECL_IMPLICIT_TYPEDEF_P (olddecl
)
1692 || DECL_IMPLICIT_TYPEDEF_P (newdecl
))
1693 /* One is an implicit typedef, that's ok. */
1696 error ("%q#D redeclared as different kind of entity", newdecl
);
1697 inform (olddecl_loc
, "previous declaration %q#D", olddecl
);
1699 return error_mark_node
;
1701 else if (!types_match
)
1703 if (CP_DECL_CONTEXT (newdecl
) != CP_DECL_CONTEXT (olddecl
))
1704 /* These are certainly not duplicate declarations; they're
1705 from different scopes. */
1708 if (TREE_CODE (newdecl
) == TEMPLATE_DECL
)
1710 tree oldres
= DECL_TEMPLATE_RESULT (olddecl
);
1711 tree newres
= DECL_TEMPLATE_RESULT (newdecl
);
1713 /* The name of a class template may not be declared to refer to
1714 any other template, class, function, object, namespace, value,
1715 or type in the same scope. */
1716 if (TREE_CODE (oldres
) == TYPE_DECL
1717 || TREE_CODE (newres
) == TYPE_DECL
)
1719 error_at (newdecl_loc
,
1720 "conflicting declaration of template %q#D", newdecl
);
1721 inform (olddecl_loc
,
1722 "previous declaration %q#D", olddecl
);
1723 return error_mark_node
;
1726 else if (TREE_CODE (oldres
) == FUNCTION_DECL
1727 && TREE_CODE (newres
) == FUNCTION_DECL
)
1729 if (duplicate_function_template_decls (newdecl
, olddecl
))
1730 return error_mark_node
;
1733 else if (check_concept_refinement (olddecl
, newdecl
))
1734 return error_mark_node
;
1737 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1739 if (DECL_EXTERN_C_P (newdecl
) && DECL_EXTERN_C_P (olddecl
))
1741 error_at (newdecl_loc
,
1742 "conflicting declaration of C function %q#D",
1744 inform (olddecl_loc
,
1745 "previous declaration %q#D", olddecl
);
1748 /* For function versions, params and types match, but they
1749 are not ambiguous. */
1750 else if ((!DECL_FUNCTION_VERSIONED (newdecl
)
1751 && !DECL_FUNCTION_VERSIONED (olddecl
))
1752 // The functions have the same parameter types.
1753 && compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl
)),
1754 TYPE_ARG_TYPES (TREE_TYPE (olddecl
)))
1755 // And the same constraints.
1756 && equivalently_constrained (newdecl
, olddecl
))
1758 error_at (newdecl_loc
,
1759 "ambiguating new declaration of %q#D", newdecl
);
1760 inform (olddecl_loc
,
1761 "old declaration %q#D", olddecl
);
1762 return error_mark_node
;
1769 error_at (newdecl_loc
, "conflicting declaration %q#D", newdecl
);
1770 inform (olddecl_loc
,
1771 "previous declaration as %q#D", olddecl
);
1772 return error_mark_node
;
1775 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
1776 && ((DECL_TEMPLATE_SPECIALIZATION (olddecl
)
1777 && (!DECL_TEMPLATE_INFO (newdecl
)
1778 || (DECL_TI_TEMPLATE (newdecl
)
1779 != DECL_TI_TEMPLATE (olddecl
))))
1780 || (DECL_TEMPLATE_SPECIALIZATION (newdecl
)
1781 && (!DECL_TEMPLATE_INFO (olddecl
)
1782 || (DECL_TI_TEMPLATE (olddecl
)
1783 != DECL_TI_TEMPLATE (newdecl
))))))
1784 /* It's OK to have a template specialization and a non-template
1785 with the same type, or to have specializations of two
1786 different templates with the same type. Note that if one is a
1787 specialization, and the other is an instantiation of the same
1788 template, that we do not exit at this point. That situation
1789 can occur if we instantiate a template class, and then
1790 specialize one of its methods. This situation is valid, but
1791 the declarations must be merged in the usual way. */
1793 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
1794 && ((DECL_TEMPLATE_INSTANTIATION (olddecl
)
1795 && !DECL_USE_TEMPLATE (newdecl
))
1796 || (DECL_TEMPLATE_INSTANTIATION (newdecl
)
1797 && !DECL_USE_TEMPLATE (olddecl
))))
1798 /* One of the declarations is a template instantiation, and the
1799 other is not a template at all. That's OK. */
1801 else if (TREE_CODE (newdecl
) == NAMESPACE_DECL
)
1803 /* In [namespace.alias] we have:
1805 In a declarative region, a namespace-alias-definition can be
1806 used to redefine a namespace-alias declared in that declarative
1807 region to refer only to the namespace to which it already
1810 Therefore, if we encounter a second alias directive for the same
1811 alias, we can just ignore the second directive. */
1812 if (DECL_NAMESPACE_ALIAS (newdecl
)
1813 && (DECL_NAMESPACE_ALIAS (newdecl
)
1814 == DECL_NAMESPACE_ALIAS (olddecl
)))
1817 /* Leave it to update_binding to merge or report error. */
1822 const char *errmsg
= redeclaration_error_message (newdecl
, olddecl
);
1825 auto_diagnostic_group d
;
1826 error_at (newdecl_loc
, errmsg
, newdecl
);
1827 if (DECL_NAME (olddecl
) != NULL_TREE
)
1828 inform (olddecl_loc
,
1829 (DECL_INITIAL (olddecl
) && namespace_bindings_p ())
1830 ? G_("%q#D previously defined here")
1831 : G_("%q#D previously declared here"), olddecl
);
1832 return error_mark_node
;
1834 else if (TREE_CODE (olddecl
) == FUNCTION_DECL
1835 && DECL_INITIAL (olddecl
) != NULL_TREE
1836 && !prototype_p (TREE_TYPE (olddecl
))
1837 && prototype_p (TREE_TYPE (newdecl
)))
1839 /* Prototype decl follows defn w/o prototype. */
1840 auto_diagnostic_group d
;
1841 if (warning_at (newdecl_loc
, 0,
1842 "prototype specified for %q#D", newdecl
))
1843 inform (olddecl_loc
,
1844 "previous non-prototype definition here");
1846 else if (VAR_OR_FUNCTION_DECL_P (olddecl
)
1847 && DECL_LANGUAGE (newdecl
) != DECL_LANGUAGE (olddecl
))
1850 If two declarations of the same function or object
1851 specify different linkage-specifications ..., the program
1852 is ill-formed.... Except for functions with C++ linkage,
1853 a function declaration without a linkage specification
1854 shall not precede the first linkage specification for
1855 that function. A function can be declared without a
1856 linkage specification after an explicit linkage
1857 specification has been seen; the linkage explicitly
1858 specified in the earlier declaration is not affected by
1859 such a function declaration.
1861 DR 563 raises the question why the restrictions on
1862 functions should not also apply to objects. Older
1863 versions of G++ silently ignore the linkage-specification
1871 which is clearly wrong. Therefore, we now treat objects
1873 if (current_lang_depth () == 0)
1875 /* There is no explicit linkage-specification, so we use
1876 the linkage from the previous declaration. */
1877 retrofit_lang_decl (newdecl
);
1878 SET_DECL_LANGUAGE (newdecl
, DECL_LANGUAGE (olddecl
));
1882 auto_diagnostic_group d
;
1883 error_at (newdecl_loc
,
1884 "conflicting declaration of %q#D with %qL linkage",
1885 newdecl
, DECL_LANGUAGE (newdecl
));
1886 inform (olddecl_loc
,
1887 "previous declaration with %qL linkage",
1888 DECL_LANGUAGE (olddecl
));
1892 if (DECL_LANG_SPECIFIC (olddecl
) && DECL_USE_TEMPLATE (olddecl
))
1894 else if (TREE_CODE (olddecl
) == FUNCTION_DECL
)
1896 /* Note: free functions, as TEMPLATE_DECLs, are handled below. */
1897 if (DECL_FUNCTION_MEMBER_P (olddecl
)
1898 && (/* grokfndecl passes member function templates too
1899 as FUNCTION_DECLs. */
1900 DECL_TEMPLATE_INFO (olddecl
)
1902 Default arguments for a member function of a class
1903 template shall be specified on the initial declaration
1904 of the member function within the class template. */
1905 || CLASSTYPE_TEMPLATE_INFO (CP_DECL_CONTEXT (olddecl
))))
1906 check_redeclaration_no_default_args (newdecl
);
1909 tree t1
= FUNCTION_FIRST_USER_PARMTYPE (olddecl
);
1910 tree t2
= FUNCTION_FIRST_USER_PARMTYPE (newdecl
);
1913 for (; t1
&& t1
!= void_list_node
;
1914 t1
= TREE_CHAIN (t1
), t2
= TREE_CHAIN (t2
), i
++)
1915 if (TREE_PURPOSE (t1
) && TREE_PURPOSE (t2
))
1917 if (simple_cst_equal (TREE_PURPOSE (t1
),
1918 TREE_PURPOSE (t2
)) == 1)
1920 auto_diagnostic_group d
;
1921 if (permerror (newdecl_loc
,
1922 "default argument given for parameter "
1923 "%d of %q#D", i
, newdecl
))
1924 inform (olddecl_loc
,
1925 "previous specification in %q#D here",
1930 auto_diagnostic_group d
;
1931 error_at (newdecl_loc
,
1932 "default argument given for parameter %d "
1933 "of %q#D", i
, newdecl
);
1934 inform (olddecl_loc
,
1935 "previous specification in %q#D here",
1940 /* C++17 11.3.6/4: "If a friend declaration specifies a default
1941 argument expression, that declaration... shall be the only
1942 declaration of the function or function template in the
1943 translation unit." */
1944 check_no_redeclaration_friend_default_args
1945 (olddecl
, newdecl
, DECL_HIDDEN_FRIEND_P (olddecl
));
1950 /* Do not merge an implicit typedef with an explicit one. In:
1954 typedef class A A __attribute__ ((foo));
1956 the attribute should apply only to the typedef. */
1957 if (TREE_CODE (olddecl
) == TYPE_DECL
1958 && (DECL_IMPLICIT_TYPEDEF_P (olddecl
)
1959 || DECL_IMPLICIT_TYPEDEF_P (newdecl
)))
1962 if (!validate_constexpr_redeclaration (olddecl
, newdecl
))
1963 return error_mark_node
;
1965 /* We have committed to returning OLDDECL at this point. */
1967 /* If new decl is `static' and an `extern' was seen previously,
1969 warn_extern_redeclared_static (newdecl
, olddecl
);
1971 /* True to merge attributes between the declarations, false to
1972 set OLDDECL's attributes to those of NEWDECL (for template
1973 explicit specializations that specify their own attributes
1974 independent of those specified for the primary template). */
1975 const bool merge_attr
= (TREE_CODE (newdecl
) != FUNCTION_DECL
1976 || !DECL_TEMPLATE_SPECIALIZATION (newdecl
)
1977 || DECL_TEMPLATE_SPECIALIZATION (olddecl
));
1979 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1983 if (diagnose_mismatched_attributes (olddecl
, newdecl
))
1984 inform (olddecl_loc
, DECL_INITIAL (olddecl
)
1985 ? G_("previous definition of %qD here")
1986 : G_("previous declaration of %qD here"), olddecl
);
1988 /* [dcl.attr.noreturn]: The first declaration of a function shall
1989 specify the noreturn attribute if any declaration of that function
1990 specifies the noreturn attribute. */
1992 if (TREE_THIS_VOLATILE (newdecl
)
1993 && !TREE_THIS_VOLATILE (olddecl
)
1994 /* This applies to [[noreturn]] only, not its GNU variants. */
1995 && (a
= lookup_attribute ("noreturn", DECL_ATTRIBUTES (newdecl
)))
1996 && cxx11_attribute_p (a
)
1997 && get_attribute_namespace (a
) == NULL_TREE
)
1999 error_at (newdecl_loc
, "function %qD declared %<[[noreturn]]%> "
2000 "but its first declaration was not", newdecl
);
2001 inform (olddecl_loc
, "previous declaration of %qD", olddecl
);
2005 /* Now that functions must hold information normally held
2006 by field decls, there is extra work to do so that
2007 declaration information does not get destroyed during
2009 if (DECL_VINDEX (olddecl
))
2010 DECL_VINDEX (newdecl
) = DECL_VINDEX (olddecl
);
2011 if (DECL_CONTEXT (olddecl
))
2012 DECL_CONTEXT (newdecl
) = DECL_CONTEXT (olddecl
);
2013 DECL_STATIC_CONSTRUCTOR (newdecl
) |= DECL_STATIC_CONSTRUCTOR (olddecl
);
2014 DECL_STATIC_DESTRUCTOR (newdecl
) |= DECL_STATIC_DESTRUCTOR (olddecl
);
2015 DECL_PURE_VIRTUAL_P (newdecl
) |= DECL_PURE_VIRTUAL_P (olddecl
);
2016 DECL_VIRTUAL_P (newdecl
) |= DECL_VIRTUAL_P (olddecl
);
2017 DECL_INVALID_OVERRIDER_P (newdecl
) |= DECL_INVALID_OVERRIDER_P (olddecl
);
2018 DECL_FINAL_P (newdecl
) |= DECL_FINAL_P (olddecl
);
2019 DECL_OVERRIDE_P (newdecl
) |= DECL_OVERRIDE_P (olddecl
);
2020 DECL_THIS_STATIC (newdecl
) |= DECL_THIS_STATIC (olddecl
);
2021 if (DECL_OVERLOADED_OPERATOR_P (olddecl
))
2022 DECL_OVERLOADED_OPERATOR_CODE_RAW (newdecl
)
2023 = DECL_OVERLOADED_OPERATOR_CODE_RAW (olddecl
);
2024 new_defines_function
= DECL_INITIAL (newdecl
) != NULL_TREE
;
2026 /* Optionally warn about more than one declaration for the same
2027 name, but don't warn about a function declaration followed by a
2029 if (warn_redundant_decls
&& ! DECL_ARTIFICIAL (olddecl
)
2030 && !(new_defines_function
&& DECL_INITIAL (olddecl
) == NULL_TREE
)
2031 /* Don't warn about extern decl followed by definition. */
2032 && !(DECL_EXTERNAL (olddecl
) && ! DECL_EXTERNAL (newdecl
))
2033 /* Don't warn about friends, let add_friend take care of it. */
2034 && ! (newdecl_is_friend
|| DECL_FRIEND_P (olddecl
))
2035 /* Don't warn about declaration followed by specialization. */
2036 && (! DECL_TEMPLATE_SPECIALIZATION (newdecl
)
2037 || DECL_TEMPLATE_SPECIALIZATION (olddecl
)))
2039 auto_diagnostic_group d
;
2040 if (warning_at (newdecl_loc
,
2041 OPT_Wredundant_decls
,
2042 "redundant redeclaration of %qD in same scope",
2044 inform (olddecl_loc
,
2045 "previous declaration of %qD", olddecl
);
2048 if (!(DECL_TEMPLATE_INSTANTIATION (olddecl
)
2049 && DECL_TEMPLATE_SPECIALIZATION (newdecl
)))
2051 if (DECL_DELETED_FN (newdecl
))
2053 auto_diagnostic_group d
;
2054 error_at (newdecl_loc
, "deleted definition of %qD", newdecl
);
2055 inform (olddecl_loc
,
2056 "previous declaration of %qD", olddecl
);
2058 DECL_DELETED_FN (newdecl
) |= DECL_DELETED_FN (olddecl
);
2062 /* Deal with C++: must preserve virtual function table size. */
2063 if (TREE_CODE (olddecl
) == TYPE_DECL
)
2065 tree newtype
= TREE_TYPE (newdecl
);
2066 tree oldtype
= TREE_TYPE (olddecl
);
2068 if (newtype
!= error_mark_node
&& oldtype
!= error_mark_node
2069 && TYPE_LANG_SPECIFIC (newtype
) && TYPE_LANG_SPECIFIC (oldtype
))
2070 CLASSTYPE_FRIEND_CLASSES (newtype
)
2071 = CLASSTYPE_FRIEND_CLASSES (oldtype
);
2073 DECL_ORIGINAL_TYPE (newdecl
) = DECL_ORIGINAL_TYPE (olddecl
);
2076 /* Copy all the DECL_... slots specified in the new decl except for
2077 any that we copy here from the old type. */
2079 DECL_ATTRIBUTES (newdecl
)
2080 = (*targetm
.merge_decl_attributes
) (olddecl
, newdecl
);
2082 DECL_ATTRIBUTES (olddecl
) = DECL_ATTRIBUTES (newdecl
);
2084 if (DECL_DECLARES_FUNCTION_P (olddecl
))
2086 olddecl_friend
= DECL_FRIEND_P (olddecl
);
2087 olddecl_hidden_friend
= DECL_HIDDEN_FRIEND_P (olddecl
);
2088 hidden_friend
= (DECL_ANTICIPATED (olddecl
)
2089 && DECL_HIDDEN_FRIEND_P (olddecl
)
2090 && newdecl_is_friend
);
2093 DECL_ANTICIPATED (olddecl
) = 0;
2094 DECL_HIDDEN_FRIEND_P (olddecl
) = 0;
2098 if (TREE_CODE (newdecl
) == TEMPLATE_DECL
)
2100 tree old_result
= DECL_TEMPLATE_RESULT (olddecl
);
2101 tree new_result
= DECL_TEMPLATE_RESULT (newdecl
);
2102 TREE_TYPE (olddecl
) = TREE_TYPE (old_result
);
2104 /* The new decl should not already have gathered any
2106 gcc_assert (!DECL_TEMPLATE_SPECIALIZATIONS (newdecl
));
2108 DECL_ATTRIBUTES (old_result
)
2109 = (*targetm
.merge_decl_attributes
) (old_result
, new_result
);
2111 if (DECL_FUNCTION_TEMPLATE_P (newdecl
))
2113 if (DECL_SOURCE_LOCATION (newdecl
)
2114 != DECL_SOURCE_LOCATION (olddecl
))
2116 /* Per C++11 8.3.6/4, default arguments cannot be added in
2117 later declarations of a function template. */
2118 check_redeclaration_no_default_args (newdecl
);
2119 /* C++17 11.3.6/4: "If a friend declaration specifies a default
2120 argument expression, that declaration... shall be the only
2121 declaration of the function or function template in the
2122 translation unit." */
2123 check_no_redeclaration_friend_default_args
2124 (old_result
, new_result
, olddecl_hidden_friend
);
2127 check_default_args (newdecl
);
2129 if (GNU_INLINE_P (old_result
) != GNU_INLINE_P (new_result
)
2130 && DECL_INITIAL (new_result
))
2132 if (DECL_INITIAL (old_result
))
2133 DECL_UNINLINABLE (old_result
) = 1;
2135 DECL_UNINLINABLE (old_result
) = DECL_UNINLINABLE (new_result
);
2136 DECL_EXTERNAL (old_result
) = DECL_EXTERNAL (new_result
);
2137 DECL_NOT_REALLY_EXTERN (old_result
)
2138 = DECL_NOT_REALLY_EXTERN (new_result
);
2139 DECL_INTERFACE_KNOWN (old_result
)
2140 = DECL_INTERFACE_KNOWN (new_result
);
2141 DECL_DECLARED_INLINE_P (old_result
)
2142 = DECL_DECLARED_INLINE_P (new_result
);
2143 DECL_DISREGARD_INLINE_LIMITS (old_result
)
2144 |= DECL_DISREGARD_INLINE_LIMITS (new_result
);
2149 DECL_DECLARED_INLINE_P (old_result
)
2150 |= DECL_DECLARED_INLINE_P (new_result
);
2151 DECL_DISREGARD_INLINE_LIMITS (old_result
)
2152 |= DECL_DISREGARD_INLINE_LIMITS (new_result
);
2153 check_redeclaration_exception_specification (newdecl
, olddecl
);
2155 merge_attribute_bits (new_result
, old_result
);
2159 /* If the new declaration is a definition, update the file and
2160 line information on the declaration, and also make
2161 the old declaration the same definition. */
2162 if (DECL_INITIAL (new_result
) != NULL_TREE
)
2164 DECL_SOURCE_LOCATION (olddecl
)
2165 = DECL_SOURCE_LOCATION (old_result
)
2166 = DECL_SOURCE_LOCATION (newdecl
);
2167 DECL_INITIAL (old_result
) = DECL_INITIAL (new_result
);
2168 if (DECL_FUNCTION_TEMPLATE_P (newdecl
))
2171 DECL_ARGUMENTS (old_result
)
2172 = DECL_ARGUMENTS (new_result
);
2173 for (parm
= DECL_ARGUMENTS (old_result
); parm
;
2174 parm
= DECL_CHAIN (parm
))
2175 DECL_CONTEXT (parm
) = old_result
;
2184 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2185 check_redeclaration_exception_specification (newdecl
, olddecl
);
2187 /* Automatically handles default parameters. */
2188 tree oldtype
= TREE_TYPE (olddecl
);
2191 /* For typedefs use the old type, as the new type's DECL_NAME points
2192 at newdecl, which will be ggc_freed. */
2193 if (TREE_CODE (newdecl
) == TYPE_DECL
)
2195 /* But NEWTYPE might have an attribute, honor that. */
2196 tree tem
= TREE_TYPE (newdecl
);
2199 if (TYPE_USER_ALIGN (tem
))
2201 if (TYPE_ALIGN (tem
) > TYPE_ALIGN (newtype
))
2202 SET_TYPE_ALIGN (newtype
, TYPE_ALIGN (tem
));
2203 TYPE_USER_ALIGN (newtype
) = true;
2206 /* And remove the new type from the variants list. */
2207 if (TYPE_NAME (TREE_TYPE (newdecl
)) == newdecl
)
2209 tree remove
= TREE_TYPE (newdecl
);
2210 if (TYPE_MAIN_VARIANT (remove
) == remove
)
2212 gcc_assert (TYPE_NEXT_VARIANT (remove
) == NULL_TREE
);
2213 /* If remove is the main variant, no need to remove that
2214 from the list. One of the DECL_ORIGINAL_TYPE
2215 variants, e.g. created for aligned attribute, might still
2216 refer to the newdecl TYPE_DECL though, so remove that one
2218 if (tree orig
= DECL_ORIGINAL_TYPE (newdecl
))
2220 for (tree t
= TYPE_MAIN_VARIANT (orig
); t
;
2221 t
= TYPE_MAIN_VARIANT (t
))
2222 if (TYPE_NAME (TYPE_NEXT_VARIANT (t
)) == newdecl
)
2224 TYPE_NEXT_VARIANT (t
)
2225 = TYPE_NEXT_VARIANT (TYPE_NEXT_VARIANT (t
));
2230 for (tree t
= TYPE_MAIN_VARIANT (remove
); ;
2231 t
= TYPE_NEXT_VARIANT (t
))
2232 if (TYPE_NEXT_VARIANT (t
) == remove
)
2234 TYPE_NEXT_VARIANT (t
) = TYPE_NEXT_VARIANT (remove
);
2239 else if (merge_attr
)
2240 newtype
= merge_types (TREE_TYPE (newdecl
), TREE_TYPE (olddecl
));
2242 newtype
= TREE_TYPE (newdecl
);
2244 if (VAR_P (newdecl
))
2246 DECL_THIS_EXTERN (newdecl
) |= DECL_THIS_EXTERN (olddecl
);
2247 /* For already initialized vars, TREE_READONLY could have been
2248 cleared in cp_finish_decl, because the var needs runtime
2249 initialization or destruction. Make sure not to set
2250 TREE_READONLY on it again. */
2251 if (DECL_INITIALIZED_P (olddecl
)
2252 && !DECL_EXTERNAL (olddecl
)
2253 && !TREE_READONLY (olddecl
))
2254 TREE_READONLY (newdecl
) = 0;
2255 DECL_INITIALIZED_P (newdecl
) |= DECL_INITIALIZED_P (olddecl
);
2256 DECL_NONTRIVIALLY_INITIALIZED_P (newdecl
)
2257 |= DECL_NONTRIVIALLY_INITIALIZED_P (olddecl
);
2258 if (DECL_DEPENDENT_INIT_P (olddecl
))
2259 SET_DECL_DEPENDENT_INIT_P (newdecl
, true);
2260 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (newdecl
)
2261 |= DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (olddecl
);
2262 DECL_DECLARED_CONSTEXPR_P (newdecl
)
2263 |= DECL_DECLARED_CONSTEXPR_P (olddecl
);
2265 /* Merge the threadprivate attribute from OLDDECL into NEWDECL. */
2266 if (DECL_LANG_SPECIFIC (olddecl
)
2267 && CP_DECL_THREADPRIVATE_P (olddecl
))
2269 /* Allocate a LANG_SPECIFIC structure for NEWDECL, if needed. */
2270 retrofit_lang_decl (newdecl
);
2271 CP_DECL_THREADPRIVATE_P (newdecl
) = 1;
2275 /* An explicit specialization of a function template or of a member
2276 function of a class template can be declared transaction_safe
2277 independently of whether the corresponding template entity is declared
2278 transaction_safe. */
2279 if (flag_tm
&& TREE_CODE (newdecl
) == FUNCTION_DECL
2280 && DECL_TEMPLATE_INSTANTIATION (olddecl
)
2281 && DECL_TEMPLATE_SPECIALIZATION (newdecl
)
2282 && tx_safe_fn_type_p (newtype
)
2283 && !tx_safe_fn_type_p (TREE_TYPE (newdecl
)))
2284 newtype
= tx_unsafe_fn_variant (newtype
);
2286 TREE_TYPE (newdecl
) = TREE_TYPE (olddecl
) = newtype
;
2288 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2289 check_default_args (newdecl
);
2291 /* Lay the type out, unless already done. */
2292 if (! same_type_p (newtype
, oldtype
)
2293 && TREE_TYPE (newdecl
) != error_mark_node
2294 && !(processing_template_decl
&& uses_template_parms (newdecl
)))
2295 layout_type (TREE_TYPE (newdecl
));
2297 if ((VAR_P (newdecl
)
2298 || TREE_CODE (newdecl
) == PARM_DECL
2299 || TREE_CODE (newdecl
) == RESULT_DECL
2300 || TREE_CODE (newdecl
) == FIELD_DECL
2301 || TREE_CODE (newdecl
) == TYPE_DECL
)
2302 && !(processing_template_decl
&& uses_template_parms (newdecl
)))
2303 layout_decl (newdecl
, 0);
2305 /* Merge deprecatedness. */
2306 if (TREE_DEPRECATED (newdecl
))
2307 TREE_DEPRECATED (olddecl
) = 1;
2309 /* Preserve function specific target and optimization options */
2310 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2312 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl
)
2313 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl
))
2314 DECL_FUNCTION_SPECIFIC_TARGET (newdecl
)
2315 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl
);
2317 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl
)
2318 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl
))
2319 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl
)
2320 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl
);
2324 /* Merge the const type qualifier. */
2325 if (TREE_READONLY (newdecl
))
2326 TREE_READONLY (olddecl
) = 1;
2327 /* Merge the volatile type qualifier. */
2328 if (TREE_THIS_VOLATILE (newdecl
))
2329 TREE_THIS_VOLATILE (olddecl
) = 1;
2332 /* Merge the initialization information. */
2333 if (DECL_INITIAL (newdecl
) == NULL_TREE
2334 && DECL_INITIAL (olddecl
) != NULL_TREE
)
2336 DECL_INITIAL (newdecl
) = DECL_INITIAL (olddecl
);
2337 DECL_SOURCE_LOCATION (newdecl
) = DECL_SOURCE_LOCATION (olddecl
);
2338 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2340 DECL_SAVED_TREE (newdecl
) = DECL_SAVED_TREE (olddecl
);
2341 DECL_STRUCT_FUNCTION (newdecl
) = DECL_STRUCT_FUNCTION (olddecl
);
2345 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2347 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl
)
2348 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl
);
2349 DECL_NO_LIMIT_STACK (newdecl
) |= DECL_NO_LIMIT_STACK (olddecl
);
2350 if (DECL_IS_OPERATOR_NEW_P (olddecl
))
2351 DECL_SET_IS_OPERATOR_NEW (newdecl
, true);
2352 DECL_LOOPING_CONST_OR_PURE_P (newdecl
)
2353 |= DECL_LOOPING_CONST_OR_PURE_P (olddecl
);
2356 merge_attribute_bits (newdecl
, olddecl
);
2359 /* Merge the noreturn bit. */
2360 TREE_THIS_VOLATILE (olddecl
) = TREE_THIS_VOLATILE (newdecl
);
2361 TREE_READONLY (olddecl
) = TREE_READONLY (newdecl
);
2362 TREE_NOTHROW (olddecl
) = TREE_NOTHROW (newdecl
);
2363 DECL_IS_MALLOC (olddecl
) = DECL_IS_MALLOC (newdecl
);
2364 DECL_PURE_P (olddecl
) = DECL_PURE_P (newdecl
);
2366 /* Keep the old RTL. */
2367 COPY_DECL_RTL (olddecl
, newdecl
);
2369 else if (VAR_P (newdecl
)
2370 && (DECL_SIZE (olddecl
) || !DECL_SIZE (newdecl
)))
2372 /* Keep the old RTL. We cannot keep the old RTL if the old
2373 declaration was for an incomplete object and the new
2374 declaration is not since many attributes of the RTL will
2376 COPY_DECL_RTL (olddecl
, newdecl
);
2379 /* If cannot merge, then use the new type and qualifiers,
2380 and don't preserve the old rtl. */
2383 /* Clean out any memory we had of the old declaration. */
2384 tree oldstatic
= value_member (olddecl
, static_aggregates
);
2386 TREE_VALUE (oldstatic
) = error_mark_node
;
2388 TREE_TYPE (olddecl
) = TREE_TYPE (newdecl
);
2389 TREE_READONLY (olddecl
) = TREE_READONLY (newdecl
);
2390 TREE_THIS_VOLATILE (olddecl
) = TREE_THIS_VOLATILE (newdecl
);
2391 TREE_NOTHROW (olddecl
) = TREE_NOTHROW (newdecl
);
2392 TREE_SIDE_EFFECTS (olddecl
) = TREE_SIDE_EFFECTS (newdecl
);
2395 /* Merge the storage class information. */
2396 merge_weak (newdecl
, olddecl
);
2398 DECL_DEFER_OUTPUT (newdecl
) |= DECL_DEFER_OUTPUT (olddecl
);
2399 TREE_PUBLIC (newdecl
) = TREE_PUBLIC (olddecl
);
2400 TREE_STATIC (olddecl
) = TREE_STATIC (newdecl
) |= TREE_STATIC (olddecl
);
2401 if (! DECL_EXTERNAL (olddecl
))
2402 DECL_EXTERNAL (newdecl
) = 0;
2403 if (! DECL_COMDAT (olddecl
))
2404 DECL_COMDAT (newdecl
) = 0;
2406 new_template_info
= NULL_TREE
;
2407 if (DECL_LANG_SPECIFIC (newdecl
) && DECL_LANG_SPECIFIC (olddecl
))
2409 bool new_redefines_gnu_inline
= false;
2411 if (new_defines_function
2412 && ((DECL_INTERFACE_KNOWN (olddecl
)
2413 && TREE_CODE (olddecl
) == FUNCTION_DECL
)
2414 || (TREE_CODE (olddecl
) == TEMPLATE_DECL
2415 && (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl
))
2416 == FUNCTION_DECL
))))
2420 if (TREE_CODE (fn
) == TEMPLATE_DECL
)
2421 fn
= DECL_TEMPLATE_RESULT (olddecl
);
2423 new_redefines_gnu_inline
= GNU_INLINE_P (fn
) && DECL_INITIAL (fn
);
2426 if (!new_redefines_gnu_inline
)
2428 DECL_INTERFACE_KNOWN (newdecl
) |= DECL_INTERFACE_KNOWN (olddecl
);
2429 DECL_NOT_REALLY_EXTERN (newdecl
) |= DECL_NOT_REALLY_EXTERN (olddecl
);
2430 DECL_COMDAT (newdecl
) |= DECL_COMDAT (olddecl
);
2432 DECL_TEMPLATE_INSTANTIATED (newdecl
)
2433 |= DECL_TEMPLATE_INSTANTIATED (olddecl
);
2434 DECL_ODR_USED (newdecl
) |= DECL_ODR_USED (olddecl
);
2436 /* If the OLDDECL is an instantiation and/or specialization,
2437 then the NEWDECL must be too. But, it may not yet be marked
2438 as such if the caller has created NEWDECL, but has not yet
2439 figured out that it is a redeclaration. */
2440 if (!DECL_USE_TEMPLATE (newdecl
))
2441 DECL_USE_TEMPLATE (newdecl
) = DECL_USE_TEMPLATE (olddecl
);
2443 /* Don't really know how much of the language-specific
2444 values we should copy from old to new. */
2445 DECL_IN_AGGR_P (newdecl
) = DECL_IN_AGGR_P (olddecl
);
2446 DECL_INITIALIZED_IN_CLASS_P (newdecl
)
2447 |= DECL_INITIALIZED_IN_CLASS_P (olddecl
);
2449 if (LANG_DECL_HAS_MIN (newdecl
))
2451 DECL_ACCESS (newdecl
) = DECL_ACCESS (olddecl
);
2452 if (DECL_TEMPLATE_INFO (newdecl
))
2454 new_template_info
= DECL_TEMPLATE_INFO (newdecl
);
2455 if (DECL_TEMPLATE_INSTANTIATION (olddecl
)
2456 && DECL_TEMPLATE_SPECIALIZATION (newdecl
))
2457 /* Remember the presence of explicit specialization args. */
2458 TINFO_USED_TEMPLATE_ID (DECL_TEMPLATE_INFO (olddecl
))
2459 = TINFO_USED_TEMPLATE_ID (new_template_info
);
2461 DECL_TEMPLATE_INFO (newdecl
) = DECL_TEMPLATE_INFO (olddecl
);
2464 if (DECL_DECLARES_FUNCTION_P (newdecl
))
2466 /* Only functions have these fields. */
2467 DECL_NONCONVERTING_P (newdecl
) = DECL_NONCONVERTING_P (olddecl
);
2468 DECL_BEFRIENDING_CLASSES (newdecl
)
2469 = chainon (DECL_BEFRIENDING_CLASSES (newdecl
),
2470 DECL_BEFRIENDING_CLASSES (olddecl
));
2471 /* DECL_THUNKS is only valid for virtual functions,
2472 otherwise it is a DECL_FRIEND_CONTEXT. */
2473 if (DECL_VIRTUAL_P (newdecl
))
2474 SET_DECL_THUNKS (newdecl
, DECL_THUNKS (olddecl
));
2476 else if (VAR_P (newdecl
))
2478 /* Only variables have this field. */
2479 if (VAR_HAD_UNKNOWN_BOUND (olddecl
))
2480 SET_VAR_HAD_UNKNOWN_BOUND (newdecl
);
2484 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2488 /* Merge parameter attributes. */
2489 tree oldarg
, newarg
;
2490 for (oldarg
= DECL_ARGUMENTS(olddecl
), newarg
= DECL_ARGUMENTS(newdecl
);
2492 oldarg
= DECL_CHAIN(oldarg
), newarg
= DECL_CHAIN(newarg
))
2494 DECL_ATTRIBUTES (newarg
)
2495 = (*targetm
.merge_decl_attributes
) (oldarg
, newarg
);
2496 DECL_ATTRIBUTES (oldarg
) = DECL_ATTRIBUTES (newarg
);
2499 if (DECL_TEMPLATE_INSTANTIATION (olddecl
)
2500 && !DECL_TEMPLATE_INSTANTIATION (newdecl
))
2502 /* If newdecl is not a specialization, then it is not a
2503 template-related function at all. And that means that we
2504 should have exited above, returning 0. */
2505 gcc_assert (DECL_TEMPLATE_SPECIALIZATION (newdecl
));
2507 if (DECL_ODR_USED (olddecl
))
2508 /* From [temp.expl.spec]:
2510 If a template, a member template or the member of a class
2511 template is explicitly specialized then that
2512 specialization shall be declared before the first use of
2513 that specialization that would cause an implicit
2514 instantiation to take place, in every translation unit in
2515 which such a use occurs. */
2516 error ("explicit specialization of %qD after first use",
2519 SET_DECL_TEMPLATE_SPECIALIZATION (olddecl
);
2520 DECL_COMDAT (newdecl
) = (TREE_PUBLIC (newdecl
)
2521 && DECL_DECLARED_INLINE_P (newdecl
));
2523 /* Don't propagate visibility from the template to the
2524 specialization here. We'll do that in determine_visibility if
2526 DECL_VISIBILITY_SPECIFIED (olddecl
) = 0;
2528 /* [temp.expl.spec/14] We don't inline explicit specialization
2529 just because the primary template says so. */
2530 gcc_assert (!merge_attr
);
2532 DECL_DECLARED_INLINE_P (olddecl
)
2533 = DECL_DECLARED_INLINE_P (newdecl
);
2535 DECL_DISREGARD_INLINE_LIMITS (olddecl
)
2536 = DECL_DISREGARD_INLINE_LIMITS (newdecl
);
2538 DECL_UNINLINABLE (olddecl
) = DECL_UNINLINABLE (newdecl
);
2540 else if (new_defines_function
&& DECL_INITIAL (olddecl
))
2542 /* Never inline re-defined extern inline functions.
2543 FIXME: this could be better handled by keeping both
2544 function as separate declarations. */
2545 DECL_UNINLINABLE (newdecl
) = 1;
2549 if (DECL_PENDING_INLINE_P (olddecl
))
2551 DECL_PENDING_INLINE_P (newdecl
) = 1;
2552 DECL_PENDING_INLINE_INFO (newdecl
)
2553 = DECL_PENDING_INLINE_INFO (olddecl
);
2555 else if (DECL_PENDING_INLINE_P (newdecl
))
2557 else if (DECL_SAVED_AUTO_RETURN_TYPE (newdecl
) == NULL
)
2558 DECL_SAVED_AUTO_RETURN_TYPE (newdecl
)
2559 = DECL_SAVED_AUTO_RETURN_TYPE (olddecl
);
2561 DECL_DECLARED_INLINE_P (newdecl
) |= DECL_DECLARED_INLINE_P (olddecl
);
2563 DECL_UNINLINABLE (newdecl
) = DECL_UNINLINABLE (olddecl
)
2564 = (DECL_UNINLINABLE (newdecl
) || DECL_UNINLINABLE (olddecl
));
2566 DECL_DISREGARD_INLINE_LIMITS (newdecl
)
2567 = DECL_DISREGARD_INLINE_LIMITS (olddecl
)
2568 = (DECL_DISREGARD_INLINE_LIMITS (newdecl
)
2569 || DECL_DISREGARD_INLINE_LIMITS (olddecl
));
2572 /* Preserve abstractness on cloned [cd]tors. */
2573 DECL_ABSTRACT_P (newdecl
) = DECL_ABSTRACT_P (olddecl
);
2575 /* Update newdecl's parms to point at olddecl. */
2576 for (parm
= DECL_ARGUMENTS (newdecl
); parm
;
2577 parm
= DECL_CHAIN (parm
))
2578 DECL_CONTEXT (parm
) = olddecl
;
2582 SET_DECL_LANGUAGE (olddecl
, DECL_LANGUAGE (newdecl
));
2583 COPY_DECL_ASSEMBLER_NAME (newdecl
, olddecl
);
2584 COPY_DECL_RTL (newdecl
, olddecl
);
2586 if (! types_match
|| new_defines_function
)
2588 /* These need to be copied so that the names are available.
2589 Note that if the types do match, we'll preserve inline
2590 info and other bits, but if not, we won't. */
2591 DECL_ARGUMENTS (olddecl
) = DECL_ARGUMENTS (newdecl
);
2592 DECL_RESULT (olddecl
) = DECL_RESULT (newdecl
);
2594 /* If redeclaring a builtin function, it stays built in
2595 if newdecl is a gnu_inline definition, or if newdecl is just
2597 if (fndecl_built_in_p (olddecl
)
2598 && (new_defines_function
? GNU_INLINE_P (newdecl
) : types_match
))
2600 copy_decl_built_in_function (newdecl
, olddecl
);
2601 /* If we're keeping the built-in definition, keep the rtl,
2602 regardless of declaration matches. */
2603 COPY_DECL_RTL (olddecl
, newdecl
);
2604 if (DECL_BUILT_IN_CLASS (newdecl
) == BUILT_IN_NORMAL
)
2606 enum built_in_function fncode
= DECL_FUNCTION_CODE (newdecl
);
2609 /* If a compatible prototype of these builtin functions
2610 is seen, assume the runtime implements it with the
2611 expected semantics. */
2612 case BUILT_IN_STPCPY
:
2613 if (builtin_decl_explicit_p (fncode
))
2614 set_builtin_decl_implicit_p (fncode
, true);
2617 if (builtin_decl_explicit_p (fncode
))
2618 set_builtin_decl_declared_p (fncode
, true);
2622 copy_attributes_to_builtin (newdecl
);
2625 if (new_defines_function
)
2626 /* If defining a function declared with other language
2627 linkage, use the previously declared language linkage. */
2628 SET_DECL_LANGUAGE (newdecl
, DECL_LANGUAGE (olddecl
));
2629 else if (types_match
)
2631 DECL_RESULT (newdecl
) = DECL_RESULT (olddecl
);
2632 /* Don't clear out the arguments if we're just redeclaring a
2634 if (DECL_ARGUMENTS (olddecl
))
2635 DECL_ARGUMENTS (newdecl
) = DECL_ARGUMENTS (olddecl
);
2638 else if (TREE_CODE (newdecl
) == NAMESPACE_DECL
)
2639 NAMESPACE_LEVEL (newdecl
) = NAMESPACE_LEVEL (olddecl
);
2641 /* Now preserve various other info from the definition. */
2642 TREE_ADDRESSABLE (newdecl
) = TREE_ADDRESSABLE (olddecl
);
2643 TREE_ASM_WRITTEN (newdecl
) = TREE_ASM_WRITTEN (olddecl
);
2644 DECL_COMMON (newdecl
) = DECL_COMMON (olddecl
);
2645 COPY_DECL_ASSEMBLER_NAME (olddecl
, newdecl
);
2647 /* Warn about conflicting visibility specifications. */
2648 if (DECL_VISIBILITY_SPECIFIED (olddecl
)
2649 && DECL_VISIBILITY_SPECIFIED (newdecl
)
2650 && DECL_VISIBILITY (newdecl
) != DECL_VISIBILITY (olddecl
))
2652 auto_diagnostic_group d
;
2653 if (warning_at (newdecl_loc
, OPT_Wattributes
,
2654 "%qD: visibility attribute ignored because it "
2655 "conflicts with previous declaration", newdecl
))
2656 inform (olddecl_loc
,
2657 "previous declaration of %qD", olddecl
);
2659 /* Choose the declaration which specified visibility. */
2660 if (DECL_VISIBILITY_SPECIFIED (olddecl
))
2662 DECL_VISIBILITY (newdecl
) = DECL_VISIBILITY (olddecl
);
2663 DECL_VISIBILITY_SPECIFIED (newdecl
) = 1;
2665 /* Init priority used to be merged from newdecl to olddecl by the memcpy,
2666 so keep this behavior. */
2667 if (VAR_P (newdecl
) && DECL_HAS_INIT_PRIORITY_P (newdecl
))
2669 SET_DECL_INIT_PRIORITY (olddecl
, DECL_INIT_PRIORITY (newdecl
));
2670 DECL_HAS_INIT_PRIORITY_P (olddecl
) = 1;
2672 /* Likewise for DECL_ALIGN, DECL_USER_ALIGN and DECL_PACKED. */
2673 if (DECL_ALIGN (olddecl
) > DECL_ALIGN (newdecl
))
2675 SET_DECL_ALIGN (newdecl
, DECL_ALIGN (olddecl
));
2676 DECL_USER_ALIGN (newdecl
) |= DECL_USER_ALIGN (olddecl
);
2678 DECL_USER_ALIGN (olddecl
) = DECL_USER_ALIGN (newdecl
);
2679 if (DECL_WARN_IF_NOT_ALIGN (olddecl
)
2680 > DECL_WARN_IF_NOT_ALIGN (newdecl
))
2681 SET_DECL_WARN_IF_NOT_ALIGN (newdecl
,
2682 DECL_WARN_IF_NOT_ALIGN (olddecl
));
2683 if (TREE_CODE (newdecl
) == FIELD_DECL
)
2684 DECL_PACKED (olddecl
) = DECL_PACKED (newdecl
);
2686 /* The DECL_LANG_SPECIFIC information in OLDDECL will be replaced
2687 with that from NEWDECL below. */
2688 if (DECL_LANG_SPECIFIC (olddecl
))
2690 gcc_assert (DECL_LANG_SPECIFIC (olddecl
)
2691 != DECL_LANG_SPECIFIC (newdecl
));
2692 ggc_free (DECL_LANG_SPECIFIC (olddecl
));
2695 /* Merge the USED information. */
2696 if (TREE_USED (olddecl
))
2697 TREE_USED (newdecl
) = 1;
2698 else if (TREE_USED (newdecl
))
2699 TREE_USED (olddecl
) = 1;
2700 if (VAR_P (newdecl
))
2702 if (DECL_READ_P (olddecl
))
2703 DECL_READ_P (newdecl
) = 1;
2704 else if (DECL_READ_P (newdecl
))
2705 DECL_READ_P (olddecl
) = 1;
2707 if (DECL_PRESERVE_P (olddecl
))
2708 DECL_PRESERVE_P (newdecl
) = 1;
2709 else if (DECL_PRESERVE_P (newdecl
))
2710 DECL_PRESERVE_P (olddecl
) = 1;
2712 /* Merge the DECL_FUNCTION_VERSIONED information. newdecl will be copied
2713 to olddecl and deleted. */
2714 if (TREE_CODE (newdecl
) == FUNCTION_DECL
2715 && DECL_FUNCTION_VERSIONED (olddecl
))
2717 /* Set the flag for newdecl so that it gets copied to olddecl. */
2718 DECL_FUNCTION_VERSIONED (newdecl
) = 1;
2719 /* newdecl will be purged after copying to olddecl and is no longer
2721 cgraph_node::delete_function_version_by_decl (newdecl
);
2724 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2727 struct symtab_node
*snode
= symtab_node::get (olddecl
);
2729 function_size
= sizeof (struct tree_decl_common
);
2731 memcpy ((char *) olddecl
+ sizeof (struct tree_common
),
2732 (char *) newdecl
+ sizeof (struct tree_common
),
2733 function_size
- sizeof (struct tree_common
));
2735 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
2736 (char *) newdecl
+ sizeof (struct tree_decl_common
),
2737 sizeof (struct tree_function_decl
) - sizeof (struct tree_decl_common
));
2739 /* Preserve symtab node mapping. */
2740 olddecl
->decl_with_vis
.symtab_node
= snode
;
2742 if (new_template_info
)
2743 /* If newdecl is a template instantiation, it is possible that
2744 the following sequence of events has occurred:
2746 o A friend function was declared in a class template. The
2747 class template was instantiated.
2749 o The instantiation of the friend declaration was
2750 recorded on the instantiation list, and is newdecl.
2752 o Later, however, instantiate_class_template called pushdecl
2753 on the newdecl to perform name injection. But, pushdecl in
2754 turn called duplicate_decls when it discovered that another
2755 declaration of a global function with the same name already
2758 o Here, in duplicate_decls, we decided to clobber newdecl.
2760 If we're going to do that, we'd better make sure that
2761 olddecl, and not newdecl, is on the list of
2762 instantiations so that if we try to do the instantiation
2763 again we won't get the clobbered declaration. */
2764 reregister_specialization (newdecl
,
2770 size_t size
= tree_code_size (TREE_CODE (newdecl
));
2772 memcpy ((char *) olddecl
+ sizeof (struct tree_common
),
2773 (char *) newdecl
+ sizeof (struct tree_common
),
2774 sizeof (struct tree_decl_common
) - sizeof (struct tree_common
));
2775 switch (TREE_CODE (newdecl
))
2785 struct symtab_node
*snode
= NULL
;
2788 && (TREE_STATIC (olddecl
) || TREE_PUBLIC (olddecl
)
2789 || DECL_EXTERNAL (olddecl
)))
2790 snode
= symtab_node::get (olddecl
);
2791 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
2792 (char *) newdecl
+ sizeof (struct tree_decl_common
),
2793 size
- sizeof (struct tree_decl_common
)
2794 + TREE_CODE_LENGTH (TREE_CODE (newdecl
)) * sizeof (char *));
2795 if (VAR_P (newdecl
))
2796 olddecl
->decl_with_vis
.symtab_node
= snode
;
2800 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
2801 (char *) newdecl
+ sizeof (struct tree_decl_common
),
2802 sizeof (struct tree_decl_non_common
) - sizeof (struct tree_decl_common
)
2803 + TREE_CODE_LENGTH (TREE_CODE (newdecl
)) * sizeof (char *));
2808 if (VAR_OR_FUNCTION_DECL_P (newdecl
))
2810 if (DECL_EXTERNAL (olddecl
)
2811 || TREE_PUBLIC (olddecl
)
2812 || TREE_STATIC (olddecl
))
2814 /* Merge the section attribute.
2815 We want to issue an error if the sections conflict but that must be
2816 done later in decl_attributes since we are called before attributes
2818 if (DECL_SECTION_NAME (newdecl
) != NULL
)
2819 set_decl_section_name (olddecl
, DECL_SECTION_NAME (newdecl
));
2821 if (DECL_ONE_ONLY (newdecl
))
2823 struct symtab_node
*oldsym
, *newsym
;
2824 if (TREE_CODE (olddecl
) == FUNCTION_DECL
)
2825 oldsym
= cgraph_node::get_create (olddecl
);
2827 oldsym
= varpool_node::get_create (olddecl
);
2828 newsym
= symtab_node::get (newdecl
);
2829 oldsym
->set_comdat_group (newsym
->get_comdat_group ());
2834 && CP_DECL_THREAD_LOCAL_P (newdecl
))
2836 CP_DECL_THREAD_LOCAL_P (olddecl
) = true;
2837 if (!processing_template_decl
)
2838 set_decl_tls_model (olddecl
, DECL_TLS_MODEL (newdecl
));
2842 DECL_UID (olddecl
) = olddecl_uid
;
2844 DECL_FRIEND_P (olddecl
) = 1;
2847 DECL_ANTICIPATED (olddecl
) = 1;
2848 DECL_HIDDEN_FRIEND_P (olddecl
) = 1;
2851 /* NEWDECL contains the merged attribute lists.
2852 Update OLDDECL to be the same. */
2853 DECL_ATTRIBUTES (olddecl
) = DECL_ATTRIBUTES (newdecl
);
2855 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2856 so that encode_section_info has a chance to look at the new decl
2857 flags and attributes. */
2858 if (DECL_RTL_SET_P (olddecl
)
2859 && (TREE_CODE (olddecl
) == FUNCTION_DECL
2861 && TREE_STATIC (olddecl
))))
2862 make_decl_rtl (olddecl
);
2864 /* The NEWDECL will no longer be needed. Because every out-of-class
2865 declaration of a member results in a call to duplicate_decls,
2866 freeing these nodes represents in a significant savings.
2868 Before releasing the node, be sore to remove function from symbol
2869 table that might have been inserted there to record comdat group.
2870 Be sure to however do not free DECL_STRUCT_FUNCTION because this
2871 structure is shared in between newdecl and oldecl. */
2872 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2873 DECL_STRUCT_FUNCTION (newdecl
) = NULL
;
2874 if (VAR_OR_FUNCTION_DECL_P (newdecl
))
2876 struct symtab_node
*snode
= symtab_node::get (newdecl
);
2881 /* Remove the associated constraints for newdecl, if any, before
2882 reclaiming memory. */
2884 remove_constraints (newdecl
);
2891 /* Return zero if the declaration NEWDECL is valid
2892 when the declaration OLDDECL (assumed to be for the same name)
2893 has already been seen.
2894 Otherwise return an error message format string with a %s
2895 where the identifier should go. */
2898 redeclaration_error_message (tree newdecl
, tree olddecl
)
2900 if (TREE_CODE (newdecl
) == TYPE_DECL
)
2902 /* Because C++ can put things into name space for free,
2903 constructs like "typedef struct foo { ... } foo"
2904 would look like an erroneous redeclaration. */
2905 if (same_type_p (TREE_TYPE (newdecl
), TREE_TYPE (olddecl
)))
2908 return G_("redefinition of %q#D");
2910 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2912 /* If this is a pure function, its olddecl will actually be
2913 the original initialization to `0' (which we force to call
2914 abort()). Don't complain about redefinition in this case. */
2915 if (DECL_LANG_SPECIFIC (olddecl
) && DECL_PURE_VIRTUAL_P (olddecl
)
2916 && DECL_INITIAL (olddecl
) == NULL_TREE
)
2919 /* If both functions come from different namespaces, this is not
2920 a redeclaration - this is a conflict with a used function. */
2921 if (DECL_NAMESPACE_SCOPE_P (olddecl
)
2922 && DECL_CONTEXT (olddecl
) != DECL_CONTEXT (newdecl
)
2923 && ! decls_match (olddecl
, newdecl
))
2924 return G_("%qD conflicts with used function");
2926 /* We'll complain about linkage mismatches in
2927 warn_extern_redeclared_static. */
2929 /* Defining the same name twice is no good. */
2930 if (decl_defined_p (olddecl
)
2931 && decl_defined_p (newdecl
))
2933 if (DECL_NAME (olddecl
) == NULL_TREE
)
2934 return G_("%q#D not declared in class");
2935 else if (!GNU_INLINE_P (olddecl
)
2936 || GNU_INLINE_P (newdecl
))
2937 return G_("redefinition of %q#D");
2940 if (DECL_DECLARED_INLINE_P (olddecl
) && DECL_DECLARED_INLINE_P (newdecl
))
2942 bool olda
= GNU_INLINE_P (olddecl
);
2943 bool newa
= GNU_INLINE_P (newdecl
);
2948 return G_("%q+D redeclared inline with "
2949 "%<gnu_inline%> attribute");
2951 return G_("%q+D redeclared inline without "
2952 "%<gnu_inline%> attribute");
2956 check_abi_tag_redeclaration
2957 (olddecl
, lookup_attribute ("abi_tag", DECL_ATTRIBUTES (olddecl
)),
2958 lookup_attribute ("abi_tag", DECL_ATTRIBUTES (newdecl
)));
2962 else if (TREE_CODE (newdecl
) == TEMPLATE_DECL
)
2966 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl
)) == TYPE_DECL
)
2968 if (COMPLETE_TYPE_P (TREE_TYPE (newdecl
))
2969 && COMPLETE_TYPE_P (TREE_TYPE (olddecl
)))
2970 return G_("redefinition of %q#D");
2974 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl
)) == CONCEPT_DECL
)
2975 return G_("redefinition of %q#D");
2977 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl
)) != FUNCTION_DECL
2978 || (DECL_TEMPLATE_RESULT (newdecl
)
2979 == DECL_TEMPLATE_RESULT (olddecl
)))
2982 nt
= DECL_TEMPLATE_RESULT (newdecl
);
2983 if (DECL_TEMPLATE_INFO (nt
))
2984 nt
= DECL_TEMPLATE_RESULT (template_for_substitution (nt
));
2985 ot
= DECL_TEMPLATE_RESULT (olddecl
);
2986 if (DECL_TEMPLATE_INFO (ot
))
2987 ot
= DECL_TEMPLATE_RESULT (template_for_substitution (ot
));
2988 if (DECL_INITIAL (nt
) && DECL_INITIAL (ot
)
2989 && (!GNU_INLINE_P (ot
) || GNU_INLINE_P (nt
)))
2990 return G_("redefinition of %q#D");
2992 if (DECL_DECLARED_INLINE_P (ot
) && DECL_DECLARED_INLINE_P (nt
))
2994 bool olda
= GNU_INLINE_P (ot
);
2995 bool newa
= GNU_INLINE_P (nt
);
3000 return G_("%q+D redeclared inline with "
3001 "%<gnu_inline%> attribute");
3003 return G_("%q+D redeclared inline without "
3004 "%<gnu_inline%> attribute");
3008 /* Core issue #226 (C++0x):
3010 If a friend function template declaration specifies a
3011 default template-argument, that declaration shall be a
3012 definition and shall be the only declaration of the
3013 function template in the translation unit. */
3014 if ((cxx_dialect
!= cxx98
)
3015 && TREE_CODE (ot
) == FUNCTION_DECL
&& DECL_FRIEND_P (ot
)
3016 && !check_default_tmpl_args (nt
, DECL_TEMPLATE_PARMS (newdecl
),
3017 /*is_primary=*/true,
3018 /*is_partial=*/false,
3019 /*is_friend_decl=*/2))
3020 return G_("redeclaration of friend %q#D "
3021 "may not have default template arguments");
3025 else if (VAR_P (newdecl
)
3026 && CP_DECL_THREAD_LOCAL_P (newdecl
) != CP_DECL_THREAD_LOCAL_P (olddecl
)
3027 && (! DECL_LANG_SPECIFIC (olddecl
)
3028 || ! CP_DECL_THREADPRIVATE_P (olddecl
)
3029 || CP_DECL_THREAD_LOCAL_P (newdecl
)))
3031 /* Only variables can be thread-local, and all declarations must
3032 agree on this property. */
3033 if (CP_DECL_THREAD_LOCAL_P (newdecl
))
3034 return G_("thread-local declaration of %q#D follows "
3035 "non-thread-local declaration");
3037 return G_("non-thread-local declaration of %q#D follows "
3038 "thread-local declaration");
3040 else if (toplevel_bindings_p () || DECL_NAMESPACE_SCOPE_P (newdecl
))
3042 /* The objects have been declared at namespace scope. If either
3043 is a member of an anonymous union, then this is an invalid
3044 redeclaration. For example:
3050 if ((VAR_P (newdecl
) && DECL_ANON_UNION_VAR_P (newdecl
))
3051 || (VAR_P (olddecl
) && DECL_ANON_UNION_VAR_P (olddecl
)))
3052 return G_("redeclaration of %q#D");
3053 /* If at least one declaration is a reference, there is no
3054 conflict. For example:
3060 if (DECL_EXTERNAL (newdecl
) || DECL_EXTERNAL (olddecl
))
3063 /* Static data member declared outside a class definition
3064 if the variable is defined within the class with constexpr
3065 specifier is declaration rather than definition (and
3067 if (cxx_dialect
>= cxx17
3069 && DECL_CLASS_SCOPE_P (olddecl
)
3070 && DECL_DECLARED_CONSTEXPR_P (olddecl
)
3071 && !DECL_INITIAL (newdecl
))
3073 DECL_EXTERNAL (newdecl
) = 1;
3074 /* For now, only warn with explicit -Wdeprecated. */
3075 if (global_options_set
.x_warn_deprecated
)
3077 auto_diagnostic_group d
;
3078 if (warning_at (DECL_SOURCE_LOCATION (newdecl
), OPT_Wdeprecated
,
3079 "redundant redeclaration of %<constexpr%> "
3080 "static data member %qD", newdecl
))
3081 inform (DECL_SOURCE_LOCATION (olddecl
),
3082 "previous declaration of %qD", olddecl
);
3087 /* Reject two definitions. */
3088 return G_("redefinition of %q#D");
3092 /* Objects declared with block scope: */
3093 /* Reject two definitions, and reject a definition
3094 together with an external reference. */
3095 if (!(DECL_EXTERNAL (newdecl
) && DECL_EXTERNAL (olddecl
)))
3096 return G_("redeclaration of %q#D");
3102 /* Hash and equality functions for the named_label table. */
3105 named_label_hash::hash (const value_type entry
)
3107 return IDENTIFIER_HASH_VALUE (entry
->name
);
3111 named_label_hash::equal (const value_type entry
, compare_type name
)
3113 return name
== entry
->name
;
3116 /* Look for a label named ID in the current function. If one cannot
3117 be found, create one. Return the named_label_entry, or NULL on
3120 static named_label_entry
*
3121 lookup_label_1 (tree id
, bool making_local_p
)
3123 /* You can't use labels at global scope. */
3124 if (current_function_decl
== NULL_TREE
)
3126 error ("label %qE referenced outside of any function", id
);
3131 named_labels
= hash_table
<named_label_hash
>::create_ggc (13);
3133 hashval_t hash
= IDENTIFIER_HASH_VALUE (id
);
3134 named_label_entry
**slot
3135 = named_labels
->find_slot_with_hash (id
, hash
, INSERT
);
3136 named_label_entry
*old
= *slot
;
3138 if (old
&& old
->label_decl
)
3140 if (!making_local_p
)
3143 if (old
->binding_level
== current_binding_level
)
3145 error ("local label %qE conflicts with existing label", id
);
3146 inform (DECL_SOURCE_LOCATION (old
->label_decl
), "previous label");
3151 /* We are making a new decl, create or reuse the named_label_entry */
3152 named_label_entry
*ent
= NULL
;
3153 if (old
&& !old
->label_decl
)
3157 ent
= ggc_cleared_alloc
<named_label_entry
> ();
3163 /* Now create the LABEL_DECL. */
3164 tree decl
= build_decl (input_location
, LABEL_DECL
, id
, void_type_node
);
3166 DECL_CONTEXT (decl
) = current_function_decl
;
3167 SET_DECL_MODE (decl
, VOIDmode
);
3170 C_DECLARED_LABEL_FLAG (decl
) = true;
3171 DECL_CHAIN (decl
) = current_binding_level
->names
;
3172 current_binding_level
->names
= decl
;
3175 ent
->label_decl
= decl
;
3180 /* Wrapper for lookup_label_1. */
3183 lookup_label (tree id
)
3185 bool subtime
= timevar_cond_start (TV_NAME_LOOKUP
);
3186 named_label_entry
*ent
= lookup_label_1 (id
, false);
3187 timevar_cond_stop (TV_NAME_LOOKUP
, subtime
);
3188 return ent
? ent
->label_decl
: NULL_TREE
;
3192 declare_local_label (tree id
)
3194 bool subtime
= timevar_cond_start (TV_NAME_LOOKUP
);
3195 named_label_entry
*ent
= lookup_label_1 (id
, true);
3196 timevar_cond_stop (TV_NAME_LOOKUP
, subtime
);
3197 return ent
? ent
->label_decl
: NULL_TREE
;
3200 /* Returns nonzero if it is ill-formed to jump past the declaration of
3201 DECL. Returns 2 if it's also a real problem. */
3204 decl_jump_unsafe (tree decl
)
3206 /* [stmt.dcl]/3: A program that jumps from a point where a local variable
3207 with automatic storage duration is not in scope to a point where it is
3208 in scope is ill-formed unless the variable has scalar type, class type
3209 with a trivial default constructor and a trivial destructor, a
3210 cv-qualified version of one of these types, or an array of one of the
3211 preceding types and is declared without an initializer (8.5). */
3212 tree type
= TREE_TYPE (decl
);
3214 if (!VAR_P (decl
) || TREE_STATIC (decl
)
3215 || type
== error_mark_node
)
3218 if (DECL_NONTRIVIALLY_INITIALIZED_P (decl
)
3219 || variably_modified_type_p (type
, NULL_TREE
))
3222 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type
))
3228 /* A subroutine of check_previous_goto_1 and check_goto to identify a branch
3232 identify_goto (tree decl
, location_t loc
, const location_t
*locus
,
3233 diagnostic_t diag_kind
)
3236 = emit_diagnostic (diag_kind
, loc
, 0,
3237 decl
? N_("jump to label %qD")
3238 : N_("jump to case label"), decl
);
3239 if (complained
&& locus
)
3240 inform (*locus
, " from here");
3244 /* Check that a single previously seen jump to a newly defined label
3245 is OK. DECL is the LABEL_DECL or 0; LEVEL is the binding_level for
3246 the jump context; NAMES are the names in scope in LEVEL at the jump
3247 context; LOCUS is the source position of the jump or 0. Returns
3248 true if all is well. */
3251 check_previous_goto_1 (tree decl
, cp_binding_level
* level
, tree names
,
3252 bool exited_omp
, const location_t
*locus
)
3254 cp_binding_level
*b
;
3255 bool complained
= false;
3257 bool saw_eh
= false, saw_omp
= false, saw_tm
= false, saw_cxif
= false;
3261 complained
= identify_goto (decl
, input_location
, locus
, DK_ERROR
);
3263 inform (input_location
, " exits OpenMP structured block");
3268 for (b
= current_binding_level
; b
; b
= b
->level_chain
)
3270 tree new_decls
, old_decls
= (b
== level
? names
: NULL_TREE
);
3272 for (new_decls
= b
->names
; new_decls
!= old_decls
;
3273 new_decls
= (DECL_P (new_decls
) ? DECL_CHAIN (new_decls
)
3274 : TREE_CHAIN (new_decls
)))
3276 int problem
= decl_jump_unsafe (new_decls
);
3282 complained
= identify_goto (decl
, input_location
, locus
,
3284 ? DK_ERROR
: DK_PERMERROR
);
3290 inform (DECL_SOURCE_LOCATION (new_decls
),
3291 " crosses initialization of %q#D", new_decls
);
3293 inform (DECL_SOURCE_LOCATION (new_decls
),
3294 " enters scope of %q#D, which has "
3295 "non-trivial destructor", new_decls
);
3302 const char *inf
= NULL
;
3303 location_t loc
= input_location
;
3308 inf
= G_(" enters %<try%> block");
3314 inf
= G_(" enters %<catch%> block");
3320 inf
= G_(" enters OpenMP structured block");
3324 case sk_transaction
:
3326 inf
= G_(" enters synchronized or atomic statement");
3331 if (!saw_cxif
&& level_for_constexpr_if (b
->level_chain
))
3333 inf
= G_(" enters %<constexpr if%> statement");
3334 loc
= EXPR_LOCATION (b
->level_chain
->this_entity
);
3346 complained
= identify_goto (decl
, input_location
, locus
, DK_ERROR
);
3357 check_previous_goto (tree decl
, struct named_label_use_entry
*use
)
3359 check_previous_goto_1 (decl
, use
->binding_level
,
3360 use
->names_in_scope
, use
->in_omp_scope
,
3361 &use
->o_goto_locus
);
3365 check_switch_goto (cp_binding_level
* level
)
3367 return check_previous_goto_1 (NULL_TREE
, level
, level
->names
, false, NULL
);
3370 /* Check that a new jump to a label DECL is OK. Called by
3371 finish_goto_stmt. */
3374 check_goto (tree decl
)
3376 /* We can't know where a computed goto is jumping.
3377 So we assume that it's OK. */
3378 if (TREE_CODE (decl
) != LABEL_DECL
)
3381 /* We didn't record any information about this label when we created it,
3382 and there's not much point since it's trivial to analyze as a return. */
3383 if (decl
== cdtor_label
)
3386 hashval_t hash
= IDENTIFIER_HASH_VALUE (DECL_NAME (decl
));
3387 named_label_entry
**slot
3388 = named_labels
->find_slot_with_hash (DECL_NAME (decl
), hash
, NO_INSERT
);
3389 named_label_entry
*ent
= *slot
;
3391 /* If the label hasn't been defined yet, defer checking. */
3392 if (! DECL_INITIAL (decl
))
3394 /* Don't bother creating another use if the last goto had the
3395 same data, and will therefore create the same set of errors. */
3397 && ent
->uses
->names_in_scope
== current_binding_level
->names
)
3400 named_label_use_entry
*new_use
3401 = ggc_alloc
<named_label_use_entry
> ();
3402 new_use
->binding_level
= current_binding_level
;
3403 new_use
->names_in_scope
= current_binding_level
->names
;
3404 new_use
->o_goto_locus
= input_location
;
3405 new_use
->in_omp_scope
= false;
3407 new_use
->next
= ent
->uses
;
3408 ent
->uses
= new_use
;
3412 bool saw_catch
= false, complained
= false;
3417 if (ent
->in_try_scope
|| ent
->in_catch_scope
|| ent
->in_transaction_scope
3418 || ent
->in_constexpr_if
3419 || ent
->in_omp_scope
|| !vec_safe_is_empty (ent
->bad_decls
))
3421 diagnostic_t diag_kind
= DK_PERMERROR
;
3422 if (ent
->in_try_scope
|| ent
->in_catch_scope
|| ent
->in_constexpr_if
3423 || ent
->in_transaction_scope
|| ent
->in_omp_scope
)
3424 diag_kind
= DK_ERROR
;
3425 complained
= identify_goto (decl
, DECL_SOURCE_LOCATION (decl
),
3426 &input_location
, diag_kind
);
3427 identified
= 1 + (diag_kind
== DK_ERROR
);
3430 FOR_EACH_VEC_SAFE_ELT (ent
->bad_decls
, ix
, bad
)
3432 int u
= decl_jump_unsafe (bad
);
3434 if (u
> 1 && DECL_ARTIFICIAL (bad
))
3436 /* Can't skip init of __exception_info. */
3437 if (identified
== 1)
3439 complained
= identify_goto (decl
, DECL_SOURCE_LOCATION (decl
),
3440 &input_location
, DK_ERROR
);
3444 inform (DECL_SOURCE_LOCATION (bad
), " enters %<catch%> block");
3447 else if (complained
)
3450 inform (DECL_SOURCE_LOCATION (bad
),
3451 " skips initialization of %q#D", bad
);
3453 inform (DECL_SOURCE_LOCATION (bad
),
3454 " enters scope of %q#D which has "
3455 "non-trivial destructor", bad
);
3461 if (ent
->in_try_scope
)
3462 inform (input_location
, " enters %<try%> block");
3463 else if (ent
->in_catch_scope
&& !saw_catch
)
3464 inform (input_location
, " enters %<catch%> block");
3465 else if (ent
->in_transaction_scope
)
3466 inform (input_location
, " enters synchronized or atomic statement");
3467 else if (ent
->in_constexpr_if
)
3468 inform (input_location
, " enters %<constexpr if%> statement");
3471 if (ent
->in_omp_scope
)
3474 inform (input_location
, " enters OpenMP structured block");
3476 else if (flag_openmp
)
3477 for (cp_binding_level
*b
= current_binding_level
; b
; b
= b
->level_chain
)
3479 if (b
== ent
->binding_level
)
3481 if (b
->kind
== sk_omp
)
3485 complained
= identify_goto (decl
,
3486 DECL_SOURCE_LOCATION (decl
),
3487 &input_location
, DK_ERROR
);
3491 inform (input_location
, " exits OpenMP structured block");
3497 /* Check that a return is ok wrt OpenMP structured blocks.
3498 Called by finish_return_stmt. Returns true if all is well. */
3501 check_omp_return (void)
3503 for (cp_binding_level
*b
= current_binding_level
; b
; b
= b
->level_chain
)
3504 if (b
->kind
== sk_omp
)
3506 error ("invalid exit from OpenMP structured block");
3509 else if (b
->kind
== sk_function_parms
)
3514 /* Define a label, specifying the location in the source file.
3515 Return the LABEL_DECL node for the label. */
3518 define_label_1 (location_t location
, tree name
)
3520 /* After labels, make any new cleanups in the function go into their
3521 own new (temporary) binding contour. */
3522 for (cp_binding_level
*p
= current_binding_level
;
3523 p
->kind
!= sk_function_parms
;
3525 p
->more_cleanups_ok
= 0;
3527 named_label_entry
*ent
= lookup_label_1 (name
, false);
3528 tree decl
= ent
->label_decl
;
3530 if (DECL_INITIAL (decl
) != NULL_TREE
)
3532 error ("duplicate label %qD", decl
);
3533 return error_mark_node
;
3537 /* Mark label as having been defined. */
3538 DECL_INITIAL (decl
) = error_mark_node
;
3539 /* Say where in the source. */
3540 DECL_SOURCE_LOCATION (decl
) = location
;
3542 ent
->binding_level
= current_binding_level
;
3543 ent
->names_in_scope
= current_binding_level
->names
;
3545 for (named_label_use_entry
*use
= ent
->uses
; use
; use
= use
->next
)
3546 check_previous_goto (decl
, use
);
3553 /* Wrapper for define_label_1. */
3556 define_label (location_t location
, tree name
)
3558 bool running
= timevar_cond_start (TV_NAME_LOOKUP
);
3559 tree ret
= define_label_1 (location
, name
);
3560 timevar_cond_stop (TV_NAME_LOOKUP
, running
);
3567 cp_binding_level
*level
;
3568 struct cp_switch
*next
;
3569 /* The SWITCH_STMT being built. */
3571 /* A splay-tree mapping the low element of a case range to the high
3572 element, or NULL_TREE if there is no high element. Used to
3573 determine whether or not a new case label duplicates an old case
3574 label. We need a tree, rather than simply a hash table, because
3575 of the GNU case range extension. */
3577 /* Remember whether a default: case label has been seen. */
3579 /* Remember whether a BREAK_STMT has been seen in this SWITCH_STMT. */
3580 bool break_stmt_seen_p
;
3581 /* Set if inside of {FOR,DO,WHILE}_BODY nested inside of a switch,
3582 where BREAK_STMT doesn't belong to the SWITCH_STMT. */
3583 bool in_loop_body_p
;
3586 /* A stack of the currently active switch statements. The innermost
3587 switch statement is on the top of the stack. There is no need to
3588 mark the stack for garbage collection because it is only active
3589 during the processing of the body of a function, and we never
3590 collect at that point. */
3592 static struct cp_switch
*switch_stack
;
3594 /* Called right after a switch-statement condition is parsed.
3595 SWITCH_STMT is the switch statement being parsed. */
3598 push_switch (tree switch_stmt
)
3600 struct cp_switch
*p
= XNEW (struct cp_switch
);
3601 p
->level
= current_binding_level
;
3602 p
->next
= switch_stack
;
3603 p
->switch_stmt
= switch_stmt
;
3604 p
->cases
= splay_tree_new (case_compare
, NULL
, NULL
);
3605 p
->has_default_p
= false;
3606 p
->break_stmt_seen_p
= false;
3607 p
->in_loop_body_p
= false;
3614 struct cp_switch
*cs
= switch_stack
;
3615 location_t switch_location
;
3617 /* Emit warnings as needed. */
3618 switch_location
= cp_expr_loc_or_input_loc (cs
->switch_stmt
);
3619 const bool bool_cond_p
3620 = (SWITCH_STMT_TYPE (cs
->switch_stmt
)
3621 && TREE_CODE (SWITCH_STMT_TYPE (cs
->switch_stmt
)) == BOOLEAN_TYPE
);
3622 if (!processing_template_decl
)
3623 c_do_switch_warnings (cs
->cases
, switch_location
,
3624 SWITCH_STMT_TYPE (cs
->switch_stmt
),
3625 SWITCH_STMT_COND (cs
->switch_stmt
), bool_cond_p
);
3627 /* For the benefit of block_may_fallthru remember if the switch body
3628 case labels cover all possible values and if there are break; stmts. */
3629 if (cs
->has_default_p
3630 || (!processing_template_decl
3631 && c_switch_covers_all_cases_p (cs
->cases
,
3632 SWITCH_STMT_TYPE (cs
->switch_stmt
))))
3633 SWITCH_STMT_ALL_CASES_P (cs
->switch_stmt
) = 1;
3634 if (!cs
->break_stmt_seen_p
)
3635 SWITCH_STMT_NO_BREAK_P (cs
->switch_stmt
) = 1;
3636 gcc_assert (!cs
->in_loop_body_p
);
3637 splay_tree_delete (cs
->cases
);
3638 switch_stack
= switch_stack
->next
;
3642 /* Note that a BREAK_STMT is about to be added. If it is inside of
3643 a SWITCH_STMT and not inside of a loop body inside of it, note
3644 in switch_stack we've seen a BREAK_STMT. */
3647 note_break_stmt (void)
3649 if (switch_stack
&& !switch_stack
->in_loop_body_p
)
3650 switch_stack
->break_stmt_seen_p
= true;
3653 /* Note the start of processing of an iteration statement's body.
3654 The note_break_stmt function will do nothing while processing it.
3655 Return a flag that should be passed to note_iteration_stmt_body_end. */
3658 note_iteration_stmt_body_start (void)
3662 bool ret
= switch_stack
->in_loop_body_p
;
3663 switch_stack
->in_loop_body_p
= true;
3667 /* Note the end of processing of an iteration statement's body. */
3670 note_iteration_stmt_body_end (bool prev
)
3673 switch_stack
->in_loop_body_p
= prev
;
3676 /* Convert a case constant VALUE in a switch to the type TYPE of the switch
3677 condition. Note that if TYPE and VALUE are already integral we don't
3678 really do the conversion because the language-independent
3679 warning/optimization code will work better that way. */
3682 case_conversion (tree type
, tree value
)
3684 if (value
== NULL_TREE
)
3687 value
= mark_rvalue_use (value
);
3689 if (INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type
))
3690 type
= type_promotes_to (type
);
3692 tree ovalue
= value
;
3693 /* The constant-expression VALUE shall be a converted constant expression
3694 of the adjusted type of the switch condition, which doesn't allow
3695 narrowing conversions. */
3696 value
= build_converted_constant_expr (type
, value
, tf_warning_or_error
);
3698 if (cxx_dialect
>= cxx11
3699 && (SCOPED_ENUM_P (type
)
3700 || !INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (ovalue
))))
3701 /* Use the converted value. */;
3703 /* The already integral case. */
3706 return cxx_constant_value (value
);
3709 /* Note that we've seen a definition of a case label, and complain if this
3710 is a bad place for one. */
3713 finish_case_label (location_t loc
, tree low_value
, tree high_value
)
3716 cp_binding_level
*p
;
3719 if (low_value
== NULL_TREE
&& high_value
== NULL_TREE
)
3720 switch_stack
->has_default_p
= true;
3722 if (processing_template_decl
)
3726 /* For templates, just add the case label; we'll do semantic
3727 analysis at instantiation-time. */
3728 label
= build_decl (loc
, LABEL_DECL
, NULL_TREE
, void_type_node
);
3729 return add_stmt (build_case_label (low_value
, high_value
, label
));
3732 /* Find the condition on which this switch statement depends. */
3733 cond
= SWITCH_STMT_COND (switch_stack
->switch_stmt
);
3734 if (cond
&& TREE_CODE (cond
) == TREE_LIST
)
3735 cond
= TREE_VALUE (cond
);
3737 if (!check_switch_goto (switch_stack
->level
))
3738 return error_mark_node
;
3740 type
= SWITCH_STMT_TYPE (switch_stack
->switch_stmt
);
3741 if (type
== error_mark_node
)
3742 return error_mark_node
;
3744 low_value
= case_conversion (type
, low_value
);
3745 high_value
= case_conversion (type
, high_value
);
3747 r
= c_add_case_label (loc
, switch_stack
->cases
, cond
, low_value
, high_value
);
3749 /* After labels, make any new cleanups in the function go into their
3750 own new (temporary) binding contour. */
3751 for (p
= current_binding_level
;
3752 p
->kind
!= sk_function_parms
;
3754 p
->more_cleanups_ok
= 0;
3759 struct typename_info
{
3767 struct typename_hasher
: ggc_ptr_hash
<tree_node
>
3769 typedef typename_info
*compare_type
;
3771 /* Hash a TYPENAME_TYPE. */
3778 hash
= (htab_hash_pointer (TYPE_CONTEXT (t
))
3779 ^ htab_hash_pointer (TYPE_IDENTIFIER (t
)));
3784 /* Compare two TYPENAME_TYPEs. */
3787 equal (tree t1
, const typename_info
*t2
)
3789 return (TYPE_IDENTIFIER (t1
) == t2
->name
3790 && TYPE_CONTEXT (t1
) == t2
->scope
3791 && TYPENAME_TYPE_FULLNAME (t1
) == t2
->template_id
3792 && TYPENAME_IS_ENUM_P (t1
) == t2
->enum_p
3793 && TYPENAME_IS_CLASS_P (t1
) == t2
->class_p
);
3797 /* Build a TYPENAME_TYPE. If the type is `typename T::t', CONTEXT is
3798 the type of `T', NAME is the IDENTIFIER_NODE for `t'.
3800 Returns the new TYPENAME_TYPE. */
3802 static GTY (()) hash_table
<typename_hasher
> *typename_htab
;
3805 build_typename_type (tree context
, tree name
, tree fullname
,
3806 enum tag_types tag_type
)
3814 if (typename_htab
== NULL
)
3815 typename_htab
= hash_table
<typename_hasher
>::create_ggc (61);
3817 ti
.scope
= FROB_CONTEXT (context
);
3819 ti
.template_id
= fullname
;
3820 ti
.enum_p
= tag_type
== enum_type
;
3821 ti
.class_p
= (tag_type
== class_type
3822 || tag_type
== record_type
3823 || tag_type
== union_type
);
3824 hash
= (htab_hash_pointer (ti
.scope
)
3825 ^ htab_hash_pointer (ti
.name
));
3827 /* See if we already have this type. */
3828 e
= typename_htab
->find_slot_with_hash (&ti
, hash
, INSERT
);
3833 /* Build the TYPENAME_TYPE. */
3834 t
= cxx_make_type (TYPENAME_TYPE
);
3835 TYPE_CONTEXT (t
) = ti
.scope
;
3836 TYPENAME_TYPE_FULLNAME (t
) = ti
.template_id
;
3837 TYPENAME_IS_ENUM_P (t
) = ti
.enum_p
;
3838 TYPENAME_IS_CLASS_P (t
) = ti
.class_p
;
3840 /* Build the corresponding TYPE_DECL. */
3841 d
= build_decl (input_location
, TYPE_DECL
, name
, t
);
3842 TYPE_NAME (TREE_TYPE (d
)) = d
;
3843 TYPE_STUB_DECL (TREE_TYPE (d
)) = d
;
3844 DECL_CONTEXT (d
) = FROB_CONTEXT (context
);
3845 DECL_ARTIFICIAL (d
) = 1;
3847 /* Store it in the hash table. */
3850 /* TYPENAME_TYPEs must always be compared structurally, because
3851 they may or may not resolve down to another type depending on
3852 the currently open classes. */
3853 SET_TYPE_STRUCTURAL_EQUALITY (t
);
3859 /* Resolve `typename CONTEXT::NAME'. TAG_TYPE indicates the tag
3860 provided to name the type. Returns an appropriate type, unless an
3861 error occurs, in which case error_mark_node is returned. If we
3862 locate a non-artificial TYPE_DECL and TF_KEEP_TYPE_DECL is set, we
3863 return that, rather than the _TYPE it corresponds to, in other
3864 cases we look through the type decl. If TF_ERROR is set, complain
3865 about errors, otherwise be quiet. */
3868 make_typename_type (tree context
, tree name
, enum tag_types tag_type
,
3869 tsubst_flags_t complain
)
3875 if (name
== error_mark_node
3876 || context
== NULL_TREE
3877 || context
== error_mark_node
)
3878 return error_mark_node
;
3882 if (!(TYPE_LANG_SPECIFIC (name
)
3883 && (CLASSTYPE_IS_TEMPLATE (name
)
3884 || CLASSTYPE_USE_TEMPLATE (name
))))
3885 name
= TYPE_IDENTIFIER (name
);
3887 /* Create a TEMPLATE_ID_EXPR for the type. */
3888 name
= build_nt (TEMPLATE_ID_EXPR
,
3889 CLASSTYPE_TI_TEMPLATE (name
),
3890 CLASSTYPE_TI_ARGS (name
));
3892 else if (TREE_CODE (name
) == TYPE_DECL
)
3893 name
= DECL_NAME (name
);
3897 if (TREE_CODE (name
) == TEMPLATE_ID_EXPR
)
3899 name
= TREE_OPERAND (name
, 0);
3900 if (DECL_TYPE_TEMPLATE_P (name
))
3901 name
= TREE_OPERAND (fullname
, 0) = DECL_NAME (name
);
3902 if (TREE_CODE (name
) != IDENTIFIER_NODE
)
3904 if (complain
& tf_error
)
3905 error ("%qD is not a type", name
);
3906 return error_mark_node
;
3909 if (TREE_CODE (name
) == TEMPLATE_DECL
)
3911 if (complain
& tf_error
)
3912 error ("%qD used without template arguments", name
);
3913 return error_mark_node
;
3915 gcc_assert (identifier_p (name
));
3916 gcc_assert (TYPE_P (context
));
3918 if (TREE_CODE (context
) == TYPE_PACK_EXPANSION
)
3919 /* This can happen for C++17 variadic using (c++/88986). */;
3920 else if (!MAYBE_CLASS_TYPE_P (context
))
3922 if (complain
& tf_error
)
3923 error ("%q#T is not a class", context
);
3924 return error_mark_node
;
3927 /* When the CONTEXT is a dependent type, NAME could refer to a
3928 dependent base class of CONTEXT. But look inside it anyway
3929 if CONTEXT is a currently open scope, in case it refers to a
3930 member of the current instantiation or a non-dependent base;
3931 lookup will stop when we hit a dependent base. */
3932 if (!dependent_scope_p (context
))
3933 /* We should only set WANT_TYPE when we're a nested typename type.
3934 Then we can give better diagnostics if we find a non-type. */
3935 t
= lookup_field (context
, name
, 2, /*want_type=*/true);
3939 if ((!t
|| TREE_CODE (t
) == TREE_LIST
) && dependent_type_p (context
))
3940 return build_typename_type (context
, name
, fullname
, tag_type
);
3942 want_template
= TREE_CODE (fullname
) == TEMPLATE_ID_EXPR
;
3946 if (complain
& tf_error
)
3948 if (!COMPLETE_TYPE_P (context
))
3949 cxx_incomplete_type_error (NULL_TREE
, context
);
3951 error (want_template
? G_("no class template named %q#T in %q#T")
3952 : G_("no type named %q#T in %q#T"), name
, context
);
3954 return error_mark_node
;
3957 /* Pull out the template from an injected-class-name (or multiple). */
3959 t
= maybe_get_template_decl_from_type_decl (t
);
3961 if (TREE_CODE (t
) == TREE_LIST
)
3963 if (complain
& tf_error
)
3965 error ("lookup of %qT in %qT is ambiguous", name
, context
);
3966 print_candidates (t
);
3968 return error_mark_node
;
3971 if (want_template
&& !DECL_TYPE_TEMPLATE_P (t
))
3973 if (complain
& tf_error
)
3974 error ("%<typename %T::%D%> names %q#T, which is not a class template",
3976 return error_mark_node
;
3978 if (!want_template
&& TREE_CODE (t
) != TYPE_DECL
)
3980 if (complain
& tf_error
)
3981 error ("%<typename %T::%D%> names %q#T, which is not a type",
3983 return error_mark_node
;
3986 if (!perform_or_defer_access_check (TYPE_BINFO (context
), t
, t
, complain
))
3987 return error_mark_node
;
3989 /* If we are currently parsing a template and if T is a typedef accessed
3990 through CONTEXT then we need to remember and check access of T at
3991 template instantiation time. */
3992 add_typedef_to_current_template_for_access_check (t
, context
, input_location
);
3995 return lookup_template_class (t
, TREE_OPERAND (fullname
, 1),
3997 /*entering_scope=*/0,
3998 complain
| tf_user
);
4000 if (DECL_ARTIFICIAL (t
) || !(complain
& tf_keep_type_decl
))
4003 maybe_record_typedef_use (t
);
4008 /* Resolve `CONTEXT::template NAME'. Returns a TEMPLATE_DECL if the name
4009 can be resolved or an UNBOUND_CLASS_TEMPLATE, unless an error occurs,
4010 in which case error_mark_node is returned.
4012 If PARM_LIST is non-NULL, also make sure that the template parameter
4013 list of TEMPLATE_DECL matches.
4015 If COMPLAIN zero, don't complain about any errors that occur. */
4018 make_unbound_class_template (tree context
, tree name
, tree parm_list
,
4019 tsubst_flags_t complain
)
4025 name
= TYPE_IDENTIFIER (name
);
4026 else if (DECL_P (name
))
4027 name
= DECL_NAME (name
);
4028 gcc_assert (identifier_p (name
));
4030 if (!dependent_type_p (context
)
4031 || currently_open_class (context
))
4033 tree tmpl
= NULL_TREE
;
4035 if (MAYBE_CLASS_TYPE_P (context
))
4036 tmpl
= lookup_field (context
, name
, 0, false);
4038 if (tmpl
&& TREE_CODE (tmpl
) == TYPE_DECL
)
4039 tmpl
= maybe_get_template_decl_from_type_decl (tmpl
);
4041 if (!tmpl
|| !DECL_TYPE_TEMPLATE_P (tmpl
))
4043 if (complain
& tf_error
)
4044 error ("no class template named %q#T in %q#T", name
, context
);
4045 return error_mark_node
;
4049 && !comp_template_parms (DECL_TEMPLATE_PARMS (tmpl
), parm_list
))
4051 if (complain
& tf_error
)
4053 error ("template parameters do not match template %qD", tmpl
);
4054 inform (DECL_SOURCE_LOCATION (tmpl
),
4055 "%qD declared here", tmpl
);
4057 return error_mark_node
;
4060 if (!perform_or_defer_access_check (TYPE_BINFO (context
), tmpl
, tmpl
,
4062 return error_mark_node
;
4067 /* Build the UNBOUND_CLASS_TEMPLATE. */
4068 t
= cxx_make_type (UNBOUND_CLASS_TEMPLATE
);
4069 TYPE_CONTEXT (t
) = FROB_CONTEXT (context
);
4070 TREE_TYPE (t
) = NULL_TREE
;
4071 SET_TYPE_STRUCTURAL_EQUALITY (t
);
4073 /* Build the corresponding TEMPLATE_DECL. */
4074 d
= build_decl (input_location
, TEMPLATE_DECL
, name
, t
);
4075 TYPE_NAME (TREE_TYPE (d
)) = d
;
4076 TYPE_STUB_DECL (TREE_TYPE (d
)) = d
;
4077 DECL_CONTEXT (d
) = FROB_CONTEXT (context
);
4078 DECL_ARTIFICIAL (d
) = 1;
4079 DECL_TEMPLATE_PARMS (d
) = parm_list
;
4086 /* Push the declarations of builtin types into the global namespace.
4087 RID_INDEX is the index of the builtin type in the array
4088 RID_POINTERS. NAME is the name used when looking up the builtin
4089 type. TYPE is the _TYPE node for the builtin type.
4091 The calls to set_global_binding below should be
4092 eliminated. Built-in types should not be looked up name; their
4093 names are keywords that the parser can recognize. However, there
4094 is code in c-common.c that uses identifier_global_value to look up
4095 built-in types by name. */
4098 record_builtin_type (enum rid rid_index
,
4102 tree decl
= NULL_TREE
;
4106 tree tname
= get_identifier (name
);
4107 tree tdecl
= build_decl (BUILTINS_LOCATION
, TYPE_DECL
, tname
, type
);
4108 DECL_ARTIFICIAL (tdecl
) = 1;
4109 set_global_binding (tdecl
);
4113 if ((int) rid_index
< (int) RID_MAX
)
4114 if (tree rname
= ridpointers
[(int) rid_index
])
4115 if (!decl
|| DECL_NAME (decl
) != rname
)
4117 tree rdecl
= build_decl (BUILTINS_LOCATION
, TYPE_DECL
, rname
, type
);
4118 DECL_ARTIFICIAL (rdecl
) = 1;
4119 set_global_binding (rdecl
);
4126 if (!TYPE_NAME (type
))
4127 TYPE_NAME (type
) = decl
;
4128 debug_hooks
->type_decl (decl
, 0);
4132 /* Push a type into the namespace so that the back ends ignore it. */
4135 record_unknown_type (tree type
, const char* name
)
4137 tree decl
= pushdecl (build_decl (UNKNOWN_LOCATION
,
4138 TYPE_DECL
, get_identifier (name
), type
));
4139 /* Make sure the "unknown type" typedecl gets ignored for debug info. */
4140 DECL_IGNORED_P (decl
) = 1;
4141 TYPE_DECL_SUPPRESS_DEBUG (decl
) = 1;
4142 TYPE_SIZE (type
) = TYPE_SIZE (void_type_node
);
4143 SET_TYPE_ALIGN (type
, 1);
4144 TYPE_USER_ALIGN (type
) = 0;
4145 SET_TYPE_MODE (type
, TYPE_MODE (void_type_node
));
4148 /* Create all the predefined identifiers. */
4151 initialize_predefined_identifiers (void)
4153 struct predefined_identifier
4155 const char *name
; /* Name. */
4156 tree
*node
; /* Node to store it in. */
4157 cp_identifier_kind kind
; /* Kind of identifier. */
4160 /* A table of identifiers to create at startup. */
4161 static const predefined_identifier predefined_identifiers
[] = {
4162 {"C++", &lang_name_cplusplus
, cik_normal
},
4163 {"C", &lang_name_c
, cik_normal
},
4164 /* Some of these names have a trailing space so that it is
4165 impossible for them to conflict with names written by users. */
4166 {"__ct ", &ctor_identifier
, cik_ctor
},
4167 {"__ct_base ", &base_ctor_identifier
, cik_ctor
},
4168 {"__ct_comp ", &complete_ctor_identifier
, cik_ctor
},
4169 {"__dt ", &dtor_identifier
, cik_dtor
},
4170 {"__dt_base ", &base_dtor_identifier
, cik_dtor
},
4171 {"__dt_comp ", &complete_dtor_identifier
, cik_dtor
},
4172 {"__dt_del ", &deleting_dtor_identifier
, cik_dtor
},
4173 {"__conv_op ", &conv_op_identifier
, cik_conv_op
},
4174 {"__in_chrg", &in_charge_identifier
, cik_normal
},
4175 {"this", &this_identifier
, cik_normal
},
4176 {"__delta", &delta_identifier
, cik_normal
},
4177 {"__pfn", &pfn_identifier
, cik_normal
},
4178 {"_vptr", &vptr_identifier
, cik_normal
},
4179 {"__vtt_parm", &vtt_parm_identifier
, cik_normal
},
4180 {"::", &global_identifier
, cik_normal
},
4181 {"std", &std_identifier
, cik_normal
},
4182 /* The demangler expects anonymous namespaces to be called
4183 something starting with '_GLOBAL__N_'. It no longer needs
4184 to be unique to the TU. */
4185 {"_GLOBAL__N_1", &anon_identifier
, cik_normal
},
4186 {"auto", &auto_identifier
, cik_normal
},
4187 {"decltype(auto)", &decltype_auto_identifier
, cik_normal
},
4188 {"initializer_list", &init_list_identifier
, cik_normal
},
4189 {"__for_range ", &for_range__identifier
, cik_normal
},
4190 {"__for_begin ", &for_begin__identifier
, cik_normal
},
4191 {"__for_end ", &for_end__identifier
, cik_normal
},
4192 {"__for_range", &for_range_identifier
, cik_normal
},
4193 {"__for_begin", &for_begin_identifier
, cik_normal
},
4194 {"__for_end", &for_end_identifier
, cik_normal
},
4195 {"abi_tag", &abi_tag_identifier
, cik_normal
},
4196 {"aligned", &aligned_identifier
, cik_normal
},
4197 {"begin", &begin_identifier
, cik_normal
},
4198 {"end", &end_identifier
, cik_normal
},
4199 {"get", &get__identifier
, cik_normal
},
4200 {"gnu", &gnu_identifier
, cik_normal
},
4201 {"tuple_element", &tuple_element_identifier
, cik_normal
},
4202 {"tuple_size", &tuple_size_identifier
, cik_normal
},
4203 {"type", &type_identifier
, cik_normal
},
4204 {"value", &value_identifier
, cik_normal
},
4205 {"_FUN", &fun_identifier
, cik_normal
},
4206 {"__closure", &closure_identifier
, cik_normal
},
4207 {"heap uninit", &heap_uninit_identifier
, cik_normal
},
4208 {"heap ", &heap_identifier
, cik_normal
},
4209 {"heap deleted", &heap_deleted_identifier
, cik_normal
},
4210 {NULL
, NULL
, cik_normal
}
4213 for (const predefined_identifier
*pid
= predefined_identifiers
;
4216 *pid
->node
= get_identifier (pid
->name
);
4217 /* Some of these identifiers already have a special kind. */
4218 if (pid
->kind
!= cik_normal
)
4219 set_identifier_kind (*pid
->node
, pid
->kind
);
4223 /* Create the predefined scalar types of C,
4224 and some nodes representing standard constants (0, 1, (void *)0).
4225 Initialize the global binding level.
4226 Make definitions for built-in primitive functions. */
4229 cxx_init_decl_processing (void)
4232 tree void_ftype_ptr
;
4234 /* Create all the identifiers we need. */
4235 initialize_predefined_identifiers ();
4237 /* Create the global variables. */
4238 push_to_top_level ();
4240 current_function_decl
= NULL_TREE
;
4241 current_binding_level
= NULL
;
4242 /* Enter the global namespace. */
4243 gcc_assert (global_namespace
== NULL_TREE
);
4244 global_namespace
= build_lang_decl (NAMESPACE_DECL
, global_identifier
,
4246 TREE_PUBLIC (global_namespace
) = 1;
4247 DECL_CONTEXT (global_namespace
)
4248 = build_translation_unit_decl (get_identifier (main_input_filename
));
4249 /* Remember whether we want the empty class passing ABI change warning
4251 TRANSLATION_UNIT_WARN_EMPTY_P (DECL_CONTEXT (global_namespace
))
4252 = warn_abi
&& abi_version_crosses (12);
4253 debug_hooks
->register_main_translation_unit
4254 (DECL_CONTEXT (global_namespace
));
4255 begin_scope (sk_namespace
, global_namespace
);
4256 current_namespace
= global_namespace
;
4258 if (flag_visibility_ms_compat
)
4259 default_visibility
= VISIBILITY_HIDDEN
;
4262 current_lang_name
= lang_name_c
;
4264 /* Create the `std' namespace. */
4265 push_namespace (std_identifier
);
4266 std_node
= current_namespace
;
4269 flag_noexcept_type
= (cxx_dialect
>= cxx17
);
4271 c_common_nodes_and_builtins ();
4273 tree bool_ftype
= build_function_type_list (boolean_type_node
, NULL_TREE
);
4275 = add_builtin_function ("__builtin_is_constant_evaluated",
4276 bool_ftype
, CP_BUILT_IN_IS_CONSTANT_EVALUATED
,
4277 BUILT_IN_FRONTEND
, NULL
, NULL_TREE
);
4278 set_call_expr_flags (decl
, ECF_CONST
| ECF_NOTHROW
| ECF_LEAF
);
4280 integer_two_node
= build_int_cst (NULL_TREE
, 2);
4282 /* Guess at the initial static decls size. */
4283 vec_alloc (static_decls
, 500);
4285 /* ... and keyed classes. */
4286 vec_alloc (keyed_classes
, 100);
4288 record_builtin_type (RID_BOOL
, "bool", boolean_type_node
);
4289 truthvalue_type_node
= boolean_type_node
;
4290 truthvalue_false_node
= boolean_false_node
;
4291 truthvalue_true_node
= boolean_true_node
;
4293 empty_except_spec
= build_tree_list (NULL_TREE
, NULL_TREE
);
4294 noexcept_true_spec
= build_tree_list (boolean_true_node
, NULL_TREE
);
4295 noexcept_false_spec
= build_tree_list (boolean_false_node
, NULL_TREE
);
4296 noexcept_deferred_spec
= build_tree_list (make_node (DEFERRED_NOEXCEPT
),
4300 record_builtin_type (RID_MAX
, NULL
, string_type_node
);
4303 delta_type_node
= ptrdiff_type_node
;
4304 vtable_index_type
= ptrdiff_type_node
;
4306 vtt_parm_type
= build_pointer_type (const_ptr_type_node
);
4307 void_ftype
= build_function_type_list (void_type_node
, NULL_TREE
);
4308 void_ftype_ptr
= build_function_type_list (void_type_node
,
4309 ptr_type_node
, NULL_TREE
);
4311 = build_exception_variant (void_ftype_ptr
, empty_except_spec
);
4313 /* Create the conversion operator marker. This operator's DECL_NAME
4314 is in the identifier table, so we can use identifier equality to
4316 conv_op_marker
= build_lang_decl (FUNCTION_DECL
, conv_op_identifier
,
4319 /* C++ extensions */
4321 unknown_type_node
= make_node (LANG_TYPE
);
4322 record_unknown_type (unknown_type_node
, "unknown type");
4324 /* Indirecting an UNKNOWN_TYPE node yields an UNKNOWN_TYPE node. */
4325 TREE_TYPE (unknown_type_node
) = unknown_type_node
;
4327 /* Looking up TYPE_POINTER_TO and TYPE_REFERENCE_TO yield the same
4329 TYPE_POINTER_TO (unknown_type_node
) = unknown_type_node
;
4330 TYPE_REFERENCE_TO (unknown_type_node
) = unknown_type_node
;
4332 init_list_type_node
= make_node (LANG_TYPE
);
4333 record_unknown_type (init_list_type_node
, "init list");
4336 /* Make sure we get a unique function type, so we can give
4337 its pointer type a name. (This wins for gdb.) */
4338 tree vfunc_type
= make_node (FUNCTION_TYPE
);
4339 TREE_TYPE (vfunc_type
) = integer_type_node
;
4340 TYPE_ARG_TYPES (vfunc_type
) = NULL_TREE
;
4341 layout_type (vfunc_type
);
4343 vtable_entry_type
= build_pointer_type (vfunc_type
);
4345 record_builtin_type (RID_MAX
, "__vtbl_ptr_type", vtable_entry_type
);
4348 = build_cplus_array_type (vtable_entry_type
, NULL_TREE
);
4349 layout_type (vtbl_type_node
);
4350 vtbl_type_node
= cp_build_qualified_type (vtbl_type_node
, TYPE_QUAL_CONST
);
4351 record_builtin_type (RID_MAX
, NULL
, vtbl_type_node
);
4352 vtbl_ptr_type_node
= build_pointer_type (vtable_entry_type
);
4353 layout_type (vtbl_ptr_type_node
);
4354 record_builtin_type (RID_MAX
, NULL
, vtbl_ptr_type_node
);
4356 push_namespace (get_identifier ("__cxxabiv1"));
4357 abi_node
= current_namespace
;
4360 global_type_node
= make_node (LANG_TYPE
);
4361 record_unknown_type (global_type_node
, "global type");
4363 any_targ_node
= make_node (LANG_TYPE
);
4364 record_unknown_type (any_targ_node
, "any type");
4367 current_lang_name
= lang_name_cplusplus
;
4369 if (aligned_new_threshold
> 1
4370 && !pow2p_hwi (aligned_new_threshold
))
4372 error ("%<-faligned-new=%d%> is not a power of two",
4373 aligned_new_threshold
);
4374 aligned_new_threshold
= 1;
4376 if (aligned_new_threshold
== -1)
4377 aligned_new_threshold
= (cxx_dialect
>= cxx17
) ? 1 : 0;
4378 if (aligned_new_threshold
== 1)
4379 aligned_new_threshold
= malloc_alignment () / BITS_PER_UNIT
;
4382 tree newattrs
, extvisattr
;
4383 tree newtype
, deltype
;
4384 tree ptr_ftype_sizetype
;
4388 = build_function_type_list (ptr_type_node
, size_type_node
, NULL_TREE
);
4389 if (cxx_dialect
== cxx98
)
4392 tree bad_alloc_type_node
;
4393 tree bad_alloc_decl
;
4395 push_namespace (std_identifier
);
4396 bad_alloc_id
= get_identifier ("bad_alloc");
4397 bad_alloc_type_node
= make_class_type (RECORD_TYPE
);
4398 TYPE_CONTEXT (bad_alloc_type_node
) = current_namespace
;
4400 = create_implicit_typedef (bad_alloc_id
, bad_alloc_type_node
);
4401 DECL_CONTEXT (bad_alloc_decl
) = current_namespace
;
4405 = add_exception_specifier (NULL_TREE
, bad_alloc_type_node
, -1);
4408 new_eh_spec
= noexcept_false_spec
;
4410 /* Ensure attribs.c is initialized. */
4413 /* Ensure constraint.cc is initialized. */
4414 init_constraint_processing ();
4416 extvisattr
= build_tree_list (get_identifier ("externally_visible"),
4418 newattrs
= tree_cons (get_identifier ("alloc_size"),
4419 build_tree_list (NULL_TREE
, integer_one_node
),
4421 newtype
= cp_build_type_attribute_variant (ptr_ftype_sizetype
, newattrs
);
4422 newtype
= build_exception_variant (newtype
, new_eh_spec
);
4423 deltype
= cp_build_type_attribute_variant (void_ftype_ptr
, extvisattr
);
4424 deltype
= build_exception_variant (deltype
, empty_except_spec
);
4425 tree opnew
= push_cp_library_fn (NEW_EXPR
, newtype
, 0);
4426 DECL_IS_MALLOC (opnew
) = 1;
4427 DECL_SET_IS_OPERATOR_NEW (opnew
, true);
4428 opnew
= push_cp_library_fn (VEC_NEW_EXPR
, newtype
, 0);
4429 DECL_IS_MALLOC (opnew
) = 1;
4430 DECL_SET_IS_OPERATOR_NEW (opnew
, true);
4431 tree opdel
= push_cp_library_fn (DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4432 DECL_SET_IS_OPERATOR_DELETE (opdel
, true);
4433 opdel
= push_cp_library_fn (VEC_DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4434 DECL_SET_IS_OPERATOR_DELETE (opdel
, true);
4435 if (flag_sized_deallocation
)
4437 /* Also push the sized deallocation variants:
4438 void operator delete(void*, std::size_t) throw();
4439 void operator delete[](void*, std::size_t) throw(); */
4440 tree void_ftype_ptr_size
4441 = build_function_type_list (void_type_node
, ptr_type_node
,
4442 size_type_node
, NULL_TREE
);
4443 deltype
= cp_build_type_attribute_variant (void_ftype_ptr_size
,
4445 deltype
= build_exception_variant (deltype
, empty_except_spec
);
4446 opdel
= push_cp_library_fn (DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4447 DECL_SET_IS_OPERATOR_DELETE (opdel
, true);
4448 opdel
= push_cp_library_fn (VEC_DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4449 DECL_SET_IS_OPERATOR_DELETE (opdel
, true);
4452 if (aligned_new_threshold
)
4454 push_namespace (std_identifier
);
4455 tree align_id
= get_identifier ("align_val_t");
4456 align_type_node
= start_enum (align_id
, NULL_TREE
, size_type_node
,
4457 NULL_TREE
, /*scoped*/true, NULL
);
4460 /* operator new (size_t, align_val_t); */
4461 newtype
= build_function_type_list (ptr_type_node
, size_type_node
,
4462 align_type_node
, NULL_TREE
);
4463 newtype
= cp_build_type_attribute_variant (newtype
, newattrs
);
4464 newtype
= build_exception_variant (newtype
, new_eh_spec
);
4465 opnew
= push_cp_library_fn (NEW_EXPR
, newtype
, 0);
4466 DECL_IS_MALLOC (opnew
) = 1;
4467 DECL_SET_IS_OPERATOR_NEW (opnew
, true);
4468 opnew
= push_cp_library_fn (VEC_NEW_EXPR
, newtype
, 0);
4469 DECL_IS_MALLOC (opnew
) = 1;
4470 DECL_SET_IS_OPERATOR_NEW (opnew
, true);
4472 /* operator delete (void *, align_val_t); */
4473 deltype
= build_function_type_list (void_type_node
, ptr_type_node
,
4474 align_type_node
, NULL_TREE
);
4475 deltype
= cp_build_type_attribute_variant (deltype
, extvisattr
);
4476 deltype
= build_exception_variant (deltype
, empty_except_spec
);
4477 opdel
= push_cp_library_fn (DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4478 DECL_SET_IS_OPERATOR_DELETE (opdel
, true);
4479 opdel
= push_cp_library_fn (VEC_DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4480 DECL_SET_IS_OPERATOR_DELETE (opdel
, true);
4482 if (flag_sized_deallocation
)
4484 /* operator delete (void *, size_t, align_val_t); */
4485 deltype
= build_function_type_list (void_type_node
, ptr_type_node
,
4486 size_type_node
, align_type_node
,
4488 deltype
= cp_build_type_attribute_variant (deltype
, extvisattr
);
4489 deltype
= build_exception_variant (deltype
, empty_except_spec
);
4490 opdel
= push_cp_library_fn (DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4491 DECL_SET_IS_OPERATOR_DELETE (opdel
, true);
4492 opdel
= push_cp_library_fn (VEC_DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4493 DECL_SET_IS_OPERATOR_DELETE (opdel
, true);
4497 nullptr_type_node
= make_node (NULLPTR_TYPE
);
4498 TYPE_SIZE (nullptr_type_node
) = bitsize_int (GET_MODE_BITSIZE (ptr_mode
));
4499 TYPE_SIZE_UNIT (nullptr_type_node
) = size_int (GET_MODE_SIZE (ptr_mode
));
4500 TYPE_UNSIGNED (nullptr_type_node
) = 1;
4501 TYPE_PRECISION (nullptr_type_node
) = GET_MODE_BITSIZE (ptr_mode
);
4502 if (abi_version_at_least (9))
4503 SET_TYPE_ALIGN (nullptr_type_node
, GET_MODE_ALIGNMENT (ptr_mode
));
4504 SET_TYPE_MODE (nullptr_type_node
, ptr_mode
);
4505 record_builtin_type (RID_MAX
, "decltype(nullptr)", nullptr_type_node
);
4506 nullptr_node
= build_int_cst (nullptr_type_node
, 0);
4510 = build_library_fn_ptr ("__cxa_pure_virtual", void_ftype
,
4511 ECF_NORETURN
| ECF_NOTHROW
| ECF_COLD
);
4513 /* Perform other language dependent initializations. */
4514 init_class_processing ();
4515 init_rtti_processing ();
4516 init_template_processing ();
4518 if (flag_exceptions
)
4519 init_exception_processing ();
4521 if (! supports_one_only ())
4524 make_fname_decl
= cp_make_fname_decl
;
4525 start_fname_decls ();
4527 /* Show we use EH for cleanups. */
4528 if (flag_exceptions
)
4529 using_eh_for_cleanups ();
4532 /* Generate an initializer for a function naming variable from
4533 NAME. NAME may be NULL, to indicate a dependent name. TYPE_P is
4534 filled in with the type of the init. */
4537 cp_fname_init (const char* name
, tree
*type_p
)
4539 tree domain
= NULL_TREE
;
4541 tree init
= NULL_TREE
;
4546 length
= strlen (name
);
4547 domain
= build_index_type (size_int (length
));
4548 init
= build_string (length
+ 1, name
);
4551 type
= cp_build_qualified_type (char_type_node
, TYPE_QUAL_CONST
);
4552 type
= build_cplus_array_type (type
, domain
);
4557 TREE_TYPE (init
) = type
;
4559 init
= error_mark_node
;
4564 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give
4565 the decl, LOC is the location to give the decl, NAME is the
4566 initialization string and TYPE_DEP indicates whether NAME depended
4567 on the type of the function. We make use of that to detect
4568 __PRETTY_FUNCTION__ inside a template fn. This is being done lazily
4569 at the point of first use, so we mustn't push the decl now. */
4572 cp_make_fname_decl (location_t loc
, tree id
, int type_dep
)
4574 const char * name
= NULL
;
4575 bool release_name
= false;
4576 if (!(type_dep
&& in_template_function ()))
4578 if (current_function_decl
== NULL_TREE
)
4580 else if (type_dep
== 1) /* __PRETTY_FUNCTION__ */
4581 name
= cxx_printable_name (current_function_decl
, 2);
4582 else if (type_dep
== 0) /* __FUNCTION__ */
4584 name
= fname_as_string (type_dep
);
4585 release_name
= true;
4591 tree init
= cp_fname_init (name
, &type
);
4592 tree decl
= build_decl (loc
, VAR_DECL
, id
, type
);
4595 free (CONST_CAST (char *, name
));
4597 /* As we're using pushdecl_with_scope, we must set the context. */
4598 DECL_CONTEXT (decl
) = current_function_decl
;
4600 TREE_READONLY (decl
) = 1;
4601 DECL_ARTIFICIAL (decl
) = 1;
4602 DECL_DECLARED_CONSTEXPR_P (decl
) = 1;
4603 TREE_STATIC (decl
) = 1;
4605 TREE_USED (decl
) = 1;
4609 SET_DECL_VALUE_EXPR (decl
, init
);
4610 DECL_HAS_VALUE_EXPR_P (decl
) = 1;
4611 /* For decl_constant_var_p. */
4612 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl
) = 1;
4615 if (current_function_decl
)
4617 DECL_CONTEXT (decl
) = current_function_decl
;
4618 decl
= pushdecl_outermost_localscope (decl
);
4619 if (decl
!= error_mark_node
)
4620 add_decl_expr (decl
);
4624 DECL_THIS_STATIC (decl
) = true;
4625 pushdecl_top_level_and_finish (decl
, NULL_TREE
);
4631 /* Install DECL as a builtin function at current (global) scope.
4632 Return the new decl (if we found an existing version). Also
4633 installs it into ::std, if it's not '_*'. */
4636 cxx_builtin_function (tree decl
)
4638 retrofit_lang_decl (decl
);
4640 DECL_ARTIFICIAL (decl
) = 1;
4641 SET_DECL_LANGUAGE (decl
, lang_c
);
4642 /* Runtime library routines are, by definition, available in an
4643 external shared object. */
4644 DECL_VISIBILITY (decl
) = VISIBILITY_DEFAULT
;
4645 DECL_VISIBILITY_SPECIFIED (decl
) = 1;
4647 tree id
= DECL_NAME (decl
);
4648 const char *name
= IDENTIFIER_POINTER (id
);
4649 if (name
[0] != '_' || name
[1] != '_')
4650 /* In the user's namespace, it must be declared before use. */
4651 DECL_ANTICIPATED (decl
) = 1;
4652 else if (IDENTIFIER_LENGTH (id
) > strlen ("___chk")
4653 && 0 != strncmp (name
+ 2, "builtin_", strlen ("builtin_"))
4654 && 0 == memcmp (name
+ IDENTIFIER_LENGTH (id
) - strlen ("_chk"),
4655 "_chk", strlen ("_chk") + 1))
4656 /* Treat __*_chk fortification functions as anticipated as well,
4657 unless they are __builtin_*_chk. */
4658 DECL_ANTICIPATED (decl
) = 1;
4660 /* All builtins that don't begin with an '_' should additionally
4661 go in the 'std' namespace. */
4664 tree std_decl
= copy_decl (decl
);
4666 push_namespace (std_identifier
);
4667 DECL_CONTEXT (std_decl
) = FROB_CONTEXT (std_node
);
4668 pushdecl (std_decl
);
4672 DECL_CONTEXT (decl
) = FROB_CONTEXT (current_namespace
);
4673 decl
= pushdecl (decl
);
4678 /* Like cxx_builtin_function, but guarantee the function is added to the global
4679 scope. This is to allow function specific options to add new machine
4680 dependent builtins when the target ISA changes via attribute((target(...)))
4681 which saves space on program startup if the program does not use non-generic
4685 cxx_builtin_function_ext_scope (tree decl
)
4687 push_nested_namespace (global_namespace
);
4688 decl
= cxx_builtin_function (decl
);
4689 pop_nested_namespace (global_namespace
);
4694 /* Generate a FUNCTION_DECL with the typical flags for a runtime library
4695 function. Not called directly. */
4698 build_library_fn (tree name
, enum tree_code operator_code
, tree type
,
4701 tree fn
= build_lang_decl (FUNCTION_DECL
, name
, type
);
4702 DECL_EXTERNAL (fn
) = 1;
4703 TREE_PUBLIC (fn
) = 1;
4704 DECL_ARTIFICIAL (fn
) = 1;
4705 DECL_OVERLOADED_OPERATOR_CODE_RAW (fn
)
4706 = OVL_OP_INFO (false, operator_code
)->ovl_op_code
;
4707 SET_DECL_LANGUAGE (fn
, lang_c
);
4708 /* Runtime library routines are, by definition, available in an
4709 external shared object. */
4710 DECL_VISIBILITY (fn
) = VISIBILITY_DEFAULT
;
4711 DECL_VISIBILITY_SPECIFIED (fn
) = 1;
4712 set_call_expr_flags (fn
, ecf_flags
);
4716 /* Returns the _DECL for a library function with C++ linkage. */
4719 build_cp_library_fn (tree name
, enum tree_code operator_code
, tree type
,
4722 tree fn
= build_library_fn (name
, operator_code
, type
, ecf_flags
);
4723 DECL_CONTEXT (fn
) = FROB_CONTEXT (current_namespace
);
4724 SET_DECL_LANGUAGE (fn
, lang_cplusplus
);
4728 /* Like build_library_fn, but takes a C string instead of an
4732 build_library_fn_ptr (const char* name
, tree type
, int ecf_flags
)
4734 return build_library_fn (get_identifier (name
), ERROR_MARK
, type
, ecf_flags
);
4737 /* Like build_cp_library_fn, but takes a C string instead of an
4741 build_cp_library_fn_ptr (const char* name
, tree type
, int ecf_flags
)
4743 return build_cp_library_fn (get_identifier (name
), ERROR_MARK
, type
,
4747 /* Like build_library_fn, but also pushes the function so that we will
4748 be able to find it via get_global_binding. Also, the function
4749 may throw exceptions listed in RAISES. */
4752 push_library_fn (tree name
, tree type
, tree raises
, int ecf_flags
)
4757 type
= build_exception_variant (type
, raises
);
4759 fn
= build_library_fn (name
, ERROR_MARK
, type
, ecf_flags
);
4760 pushdecl_top_level (fn
);
4764 /* Like build_cp_library_fn, but also pushes the function so that it
4765 will be found by normal lookup. */
4768 push_cp_library_fn (enum tree_code operator_code
, tree type
,
4771 tree fn
= build_cp_library_fn (ovl_op_identifier (false, operator_code
),
4772 operator_code
, type
, ecf_flags
);
4775 apply_tm_attr (fn
, get_identifier ("transaction_safe"));
4779 /* Like push_library_fn, but takes a TREE_LIST of parm types rather than
4783 push_void_library_fn (tree name
, tree parmtypes
, int ecf_flags
)
4785 tree type
= build_function_type (void_type_node
, parmtypes
);
4786 return push_library_fn (name
, type
, NULL_TREE
, ecf_flags
);
4789 /* Like push_library_fn, but also note that this function throws
4790 and does not return. Used for __throw_foo and the like. */
4793 push_throw_library_fn (tree name
, tree type
)
4795 tree fn
= push_library_fn (name
, type
, NULL_TREE
, ECF_NORETURN
| ECF_COLD
);
4799 /* When we call finish_struct for an anonymous union, we create
4800 default copy constructors and such. But, an anonymous union
4801 shouldn't have such things; this function undoes the damage to the
4802 anonymous union type T.
4804 (The reason that we create the synthesized methods is that we don't
4805 distinguish `union { int i; }' from `typedef union { int i; } U'.
4806 The first is an anonymous union; the second is just an ordinary
4810 fixup_anonymous_aggr (tree t
)
4812 /* Wipe out memory of synthesized methods. */
4813 TYPE_HAS_USER_CONSTRUCTOR (t
) = 0;
4814 TYPE_HAS_DEFAULT_CONSTRUCTOR (t
) = 0;
4815 TYPE_HAS_COPY_CTOR (t
) = 0;
4816 TYPE_HAS_CONST_COPY_CTOR (t
) = 0;
4817 TYPE_HAS_COPY_ASSIGN (t
) = 0;
4818 TYPE_HAS_CONST_COPY_ASSIGN (t
) = 0;
4820 /* Splice the implicitly generated functions out of TYPE_FIELDS. */
4821 for (tree probe
, *prev_p
= &TYPE_FIELDS (t
); (probe
= *prev_p
);)
4822 if (TREE_CODE (probe
) == FUNCTION_DECL
&& DECL_ARTIFICIAL (probe
))
4823 *prev_p
= DECL_CHAIN (probe
);
4825 prev_p
= &DECL_CHAIN (probe
);
4827 /* Anonymous aggregates cannot have fields with ctors, dtors or complex
4828 assignment operators (because they cannot have these methods themselves).
4829 For anonymous unions this is already checked because they are not allowed
4830 in any union, otherwise we have to check it. */
4831 if (TREE_CODE (t
) != UNION_TYPE
)
4835 for (field
= TYPE_FIELDS (t
); field
; field
= DECL_CHAIN (field
))
4836 if (TREE_CODE (field
) == FIELD_DECL
)
4838 type
= TREE_TYPE (field
);
4839 if (CLASS_TYPE_P (type
))
4841 if (TYPE_NEEDS_CONSTRUCTING (type
))
4842 error ("member %q+#D with constructor not allowed "
4843 "in anonymous aggregate", field
);
4844 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type
))
4845 error ("member %q+#D with destructor not allowed "
4846 "in anonymous aggregate", field
);
4847 if (TYPE_HAS_COMPLEX_COPY_ASSIGN (type
))
4848 error ("member %q+#D with copy assignment operator "
4849 "not allowed in anonymous aggregate", field
);
4855 /* Warn for an attribute located at LOCATION that appertains to the
4856 class type CLASS_TYPE that has not been properly placed after its
4857 class-key, in it class-specifier. */
4860 warn_misplaced_attr_for_class_type (location_t location
,
4863 gcc_assert (OVERLOAD_TYPE_P (class_type
));
4865 auto_diagnostic_group d
;
4866 if (warning_at (location
, OPT_Wattributes
,
4867 "attribute ignored in declaration "
4868 "of %q#T", class_type
))
4870 "attribute for %q#T must follow the %qs keyword",
4871 class_type
, class_key_or_enum_as_string (class_type
));
4874 /* Returns the cv-qualifiers that apply to the type specified
4875 by the DECLSPECS. */
4878 get_type_quals (const cp_decl_specifier_seq
*declspecs
)
4880 int type_quals
= TYPE_UNQUALIFIED
;
4882 if (decl_spec_seq_has_spec_p (declspecs
, ds_const
))
4883 type_quals
|= TYPE_QUAL_CONST
;
4884 if (decl_spec_seq_has_spec_p (declspecs
, ds_volatile
))
4885 type_quals
|= TYPE_QUAL_VOLATILE
;
4886 if (decl_spec_seq_has_spec_p (declspecs
, ds_restrict
))
4887 type_quals
|= TYPE_QUAL_RESTRICT
;
4892 /* Make sure that a declaration with no declarator is well-formed, i.e.
4893 just declares a tagged type or anonymous union.
4895 Returns the type declared; or NULL_TREE if none. */
4898 check_tag_decl (cp_decl_specifier_seq
*declspecs
,
4899 bool explicit_type_instantiation_p
)
4901 int saw_friend
= decl_spec_seq_has_spec_p (declspecs
, ds_friend
);
4902 int saw_typedef
= decl_spec_seq_has_spec_p (declspecs
, ds_typedef
);
4903 /* If a class, struct, or enum type is declared by the DECLSPECS
4904 (i.e, if a class-specifier, enum-specifier, or non-typename
4905 elaborated-type-specifier appears in the DECLSPECS),
4906 DECLARED_TYPE is set to the corresponding type. */
4907 tree declared_type
= NULL_TREE
;
4908 bool error_p
= false;
4910 if (declspecs
->multiple_types_p
)
4911 error_at (smallest_type_location (declspecs
),
4912 "multiple types in one declaration");
4913 else if (declspecs
->redefined_builtin_type
)
4915 location_t loc
= declspecs
->locations
[ds_redefined_builtin_type_spec
];
4916 if (!in_system_header_at (loc
))
4917 permerror (loc
, "redeclaration of C++ built-in type %qT",
4918 declspecs
->redefined_builtin_type
);
4923 && TYPE_P (declspecs
->type
)
4924 && ((TREE_CODE (declspecs
->type
) != TYPENAME_TYPE
4925 && MAYBE_CLASS_TYPE_P (declspecs
->type
))
4926 || TREE_CODE (declspecs
->type
) == ENUMERAL_TYPE
))
4927 declared_type
= declspecs
->type
;
4928 else if (declspecs
->type
== error_mark_node
)
4931 if (type_uses_auto (declared_type
))
4933 error_at (declspecs
->locations
[ds_type_spec
],
4934 "%<auto%> can only be specified for variables "
4935 "or function declarations");
4936 return error_mark_node
;
4939 if (declared_type
&& !OVERLOAD_TYPE_P (declared_type
))
4940 declared_type
= NULL_TREE
;
4942 if (!declared_type
&& !saw_friend
&& !error_p
)
4943 permerror (input_location
, "declaration does not declare anything");
4944 /* Check for an anonymous union. */
4945 else if (declared_type
&& RECORD_OR_UNION_CODE_P (TREE_CODE (declared_type
))
4946 && TYPE_UNNAMED_P (declared_type
))
4948 /* 7/3 In a simple-declaration, the optional init-declarator-list
4949 can be omitted only when declaring a class (clause 9) or
4950 enumeration (7.2), that is, when the decl-specifier-seq contains
4951 either a class-specifier, an elaborated-type-specifier with
4952 a class-key (9.1), or an enum-specifier. In these cases and
4953 whenever a class-specifier or enum-specifier is present in the
4954 decl-specifier-seq, the identifiers in these specifiers are among
4955 the names being declared by the declaration (as class-name,
4956 enum-names, or enumerators, depending on the syntax). In such
4957 cases, and except for the declaration of an unnamed bit-field (9.6),
4958 the decl-specifier-seq shall introduce one or more names into the
4959 program, or shall redeclare a name introduced by a previous
4960 declaration. [Example:
4961 enum { }; // ill-formed
4962 typedef class { }; // ill-formed
4966 error_at (declspecs
->locations
[ds_typedef
],
4967 "missing type-name in typedef-declaration");
4970 /* Anonymous unions are objects, so they can have specifiers. */;
4971 SET_ANON_AGGR_TYPE_P (declared_type
);
4973 if (TREE_CODE (declared_type
) != UNION_TYPE
)
4974 pedwarn (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (declared_type
)),
4975 OPT_Wpedantic
, "ISO C++ prohibits anonymous structs");
4980 if (decl_spec_seq_has_spec_p (declspecs
, ds_inline
))
4981 error_at (declspecs
->locations
[ds_inline
],
4982 "%<inline%> can only be specified for functions");
4983 else if (decl_spec_seq_has_spec_p (declspecs
, ds_virtual
))
4984 error_at (declspecs
->locations
[ds_virtual
],
4985 "%<virtual%> can only be specified for functions");
4987 && (!current_class_type
4988 || current_scope () != current_class_type
))
4989 error_at (declspecs
->locations
[ds_friend
],
4990 "%<friend%> can only be specified inside a class");
4991 else if (decl_spec_seq_has_spec_p (declspecs
, ds_explicit
))
4992 error_at (declspecs
->locations
[ds_explicit
],
4993 "%<explicit%> can only be specified for constructors");
4994 else if (declspecs
->storage_class
)
4995 error_at (declspecs
->locations
[ds_storage_class
],
4996 "a storage class can only be specified for objects "
4998 else if (decl_spec_seq_has_spec_p (declspecs
, ds_const
))
4999 error_at (declspecs
->locations
[ds_const
],
5000 "%<const%> can only be specified for objects and "
5002 else if (decl_spec_seq_has_spec_p (declspecs
, ds_volatile
))
5003 error_at (declspecs
->locations
[ds_volatile
],
5004 "%<volatile%> can only be specified for objects and "
5006 else if (decl_spec_seq_has_spec_p (declspecs
, ds_restrict
))
5007 error_at (declspecs
->locations
[ds_restrict
],
5008 "%<__restrict%> can only be specified for objects and "
5010 else if (decl_spec_seq_has_spec_p (declspecs
, ds_thread
))
5011 error_at (declspecs
->locations
[ds_thread
],
5012 "%<__thread%> can only be specified for objects "
5014 else if (saw_typedef
)
5015 warning_at (declspecs
->locations
[ds_typedef
], 0,
5016 "%<typedef%> was ignored in this declaration");
5017 else if (decl_spec_seq_has_spec_p (declspecs
, ds_constexpr
))
5018 error_at (declspecs
->locations
[ds_constexpr
],
5019 "%<constexpr%> cannot be used for type declarations");
5020 else if (decl_spec_seq_has_spec_p (declspecs
, ds_constinit
))
5021 error_at (declspecs
->locations
[ds_constinit
],
5022 "%<constinit%> cannot be used for type declarations");
5025 if (declspecs
->attributes
&& warn_attributes
&& declared_type
)
5028 if (!CLASS_TYPE_P (declared_type
)
5029 || !CLASSTYPE_TEMPLATE_INSTANTIATION (declared_type
))
5030 /* For a non-template class, use the name location. */
5031 loc
= location_of (declared_type
);
5033 /* For a template class (an explicit instantiation), use the
5034 current location. */
5035 loc
= input_location
;
5037 if (explicit_type_instantiation_p
)
5038 /* [dcl.attr.grammar]/4:
5040 No attribute-specifier-seq shall appertain to an explicit
5043 if (warning_at (loc
, OPT_Wattributes
,
5044 "attribute ignored in explicit instantiation %q#T",
5047 "no attribute can be applied to "
5048 "an explicit instantiation");
5051 warn_misplaced_attr_for_class_type (loc
, declared_type
);
5054 return declared_type
;
5057 /* Called when a declaration is seen that contains no names to declare.
5058 If its type is a reference to a structure, union or enum inherited
5059 from a containing scope, shadow that tag name for the current scope
5060 with a forward reference.
5061 If its type defines a new named structure or union
5062 or defines an enum, it is valid but we need not do anything here.
5063 Otherwise, it is an error.
5065 C++: may have to grok the declspecs to learn about static,
5066 complain for anonymous unions.
5068 Returns the TYPE declared -- or NULL_TREE if none. */
5071 shadow_tag (cp_decl_specifier_seq
*declspecs
)
5073 tree t
= check_tag_decl (declspecs
,
5074 /*explicit_type_instantiation_p=*/false);
5079 if (maybe_process_partial_specialization (t
) == error_mark_node
)
5082 /* This is where the variables in an anonymous union are
5083 declared. An anonymous union declaration looks like:
5085 because there is no declarator after the union, the parser
5086 sends that declaration here. */
5087 if (ANON_AGGR_TYPE_P (t
))
5089 fixup_anonymous_aggr (t
);
5091 if (TYPE_FIELDS (t
))
5093 tree decl
= grokdeclarator (/*declarator=*/NULL
,
5094 declspecs
, NORMAL
, 0, NULL
);
5095 finish_anon_union (decl
);
5102 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
5105 groktypename (cp_decl_specifier_seq
*type_specifiers
,
5106 const cp_declarator
*declarator
,
5107 bool is_template_arg
)
5111 enum decl_context context
5112 = is_template_arg
? TEMPLATE_TYPE_ARG
: TYPENAME
;
5113 attrs
= type_specifiers
->attributes
;
5114 type_specifiers
->attributes
= NULL_TREE
;
5115 type
= grokdeclarator (declarator
, type_specifiers
, context
, 0, &attrs
);
5116 if (attrs
&& type
!= error_mark_node
)
5118 if (CLASS_TYPE_P (type
))
5119 warning (OPT_Wattributes
, "ignoring attributes applied to class type %qT "
5120 "outside of definition", type
);
5121 else if (MAYBE_CLASS_TYPE_P (type
))
5122 /* A template type parameter or other dependent type. */
5123 warning (OPT_Wattributes
, "ignoring attributes applied to dependent "
5124 "type %qT without an associated declaration", type
);
5126 cplus_decl_attributes (&type
, attrs
, 0);
5131 /* Process a DECLARATOR for a function-scope variable declaration,
5132 namespace-scope variable declaration, or function declaration.
5133 (Function definitions go through start_function; class member
5134 declarations appearing in the body of the class go through
5135 grokfield.) The DECL corresponding to the DECLARATOR is returned.
5136 If an error occurs, the error_mark_node is returned instead.
5138 DECLSPECS are the decl-specifiers for the declaration. INITIALIZED is
5139 SD_INITIALIZED if an explicit initializer is present, or SD_DEFAULTED
5140 for an explicitly defaulted function, or SD_DELETED for an explicitly
5141 deleted function, but 0 (SD_UNINITIALIZED) if this is a variable
5142 implicitly initialized via a default constructor. ATTRIBUTES and
5143 PREFIX_ATTRIBUTES are GNU attributes associated with this declaration.
5145 The scope represented by the context of the returned DECL is pushed
5146 (if it is not the global namespace) and is assigned to
5147 *PUSHED_SCOPE_P. The caller is then responsible for calling
5148 pop_scope on *PUSHED_SCOPE_P if it is set. */
5151 start_decl (const cp_declarator
*declarator
,
5152 cp_decl_specifier_seq
*declspecs
,
5155 tree prefix_attributes
,
5156 tree
*pushed_scope_p
)
5164 *pushed_scope_p
= NULL_TREE
;
5166 /* An object declared as __attribute__((deprecated)) suppresses
5167 warnings of uses of other deprecated items. */
5168 if (lookup_attribute ("deprecated", attributes
))
5169 deprecated_state
= DEPRECATED_SUPPRESS
;
5171 attributes
= chainon (attributes
, prefix_attributes
);
5173 decl
= grokdeclarator (declarator
, declspecs
, NORMAL
, initialized
,
5176 deprecated_state
= DEPRECATED_NORMAL
;
5178 if (decl
== NULL_TREE
|| VOID_TYPE_P (decl
)
5179 || decl
== error_mark_node
)
5180 return error_mark_node
;
5182 context
= CP_DECL_CONTEXT (decl
);
5183 if (context
!= global_namespace
)
5184 *pushed_scope_p
= push_scope (context
);
5186 /* Is it valid for this decl to have an initializer at all?
5187 If not, set INITIALIZED to zero, which will indirectly
5188 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
5190 && TREE_CODE (decl
) == TYPE_DECL
)
5192 error_at (DECL_SOURCE_LOCATION (decl
),
5193 "typedef %qD is initialized (use %qs instead)",
5195 return error_mark_node
;
5200 if (! toplevel_bindings_p ()
5201 && DECL_EXTERNAL (decl
))
5202 warning (0, "declaration of %q#D has %<extern%> and is initialized",
5204 DECL_EXTERNAL (decl
) = 0;
5205 if (toplevel_bindings_p ())
5206 TREE_STATIC (decl
) = 1;
5208 alias
= lookup_attribute ("alias", DECL_ATTRIBUTES (decl
)) != 0;
5210 if (alias
&& TREE_CODE (decl
) == FUNCTION_DECL
)
5211 record_key_method_defined (decl
);
5213 /* If this is a typedef that names the class for linkage purposes
5214 (7.1.3p8), apply any attributes directly to the type. */
5215 if (TREE_CODE (decl
) == TYPE_DECL
5216 && OVERLOAD_TYPE_P (TREE_TYPE (decl
))
5217 && decl
== TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (decl
))))
5218 flags
= ATTR_FLAG_TYPE_IN_PLACE
;
5222 /* Set attributes here so if duplicate decl, will have proper attributes. */
5223 cplus_decl_attributes (&decl
, attributes
, flags
);
5225 /* Dllimported symbols cannot be defined. Static data members (which
5226 can be initialized in-class and dllimported) go through grokfield,
5227 not here, so we don't need to exclude those decls when checking for
5229 if (initialized
&& DECL_DLLIMPORT_P (decl
))
5231 error_at (DECL_SOURCE_LOCATION (decl
),
5232 "definition of %q#D is marked %<dllimport%>", decl
);
5233 DECL_DLLIMPORT_P (decl
) = 0;
5236 /* If #pragma weak was used, mark the decl weak now. */
5237 if (!processing_template_decl
&& !DECL_DECOMPOSITION_P (decl
))
5238 maybe_apply_pragma_weak (decl
);
5240 if (TREE_CODE (decl
) == FUNCTION_DECL
5241 && DECL_DECLARED_INLINE_P (decl
)
5242 && DECL_UNINLINABLE (decl
)
5243 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl
)))
5244 warning_at (DECL_SOURCE_LOCATION (decl
), 0,
5245 "inline function %qD given attribute %qs", decl
, "noinline");
5247 if (TYPE_P (context
) && COMPLETE_TYPE_P (complete_type (context
)))
5249 bool this_tmpl
= (processing_template_decl
5250 > template_class_depth (context
));
5253 tree field
= lookup_field (context
, DECL_NAME (decl
), 0, false);
5254 if (field
== NULL_TREE
5255 || !(VAR_P (field
) || variable_template_p (field
)))
5256 error ("%q+#D is not a static data member of %q#T", decl
, context
);
5257 else if (variable_template_p (field
)
5258 && (DECL_LANG_SPECIFIC (decl
)
5259 && DECL_TEMPLATE_SPECIALIZATION (decl
)))
5260 /* OK, specialization was already checked. */;
5261 else if (variable_template_p (field
) && !this_tmpl
)
5263 error_at (DECL_SOURCE_LOCATION (decl
),
5264 "non-member-template declaration of %qD", decl
);
5265 inform (DECL_SOURCE_LOCATION (field
), "does not match "
5266 "member template declaration here");
5267 return error_mark_node
;
5271 if (variable_template_p (field
))
5272 field
= DECL_TEMPLATE_RESULT (field
);
5274 if (DECL_CONTEXT (field
) != context
)
5276 if (!same_type_p (DECL_CONTEXT (field
), context
))
5277 permerror (input_location
, "ISO C++ does not permit %<%T::%D%> "
5278 "to be defined as %<%T::%D%>",
5279 DECL_CONTEXT (field
), DECL_NAME (decl
),
5280 context
, DECL_NAME (decl
));
5281 DECL_CONTEXT (decl
) = DECL_CONTEXT (field
);
5283 /* Static data member are tricky; an in-class initialization
5284 still doesn't provide a definition, so the in-class
5285 declaration will have DECL_EXTERNAL set, but will have an
5286 initialization. Thus, duplicate_decls won't warn
5287 about this situation, and so we check here. */
5288 if (initialized
&& DECL_INITIALIZED_IN_CLASS_P (field
))
5289 error ("duplicate initialization of %qD", decl
);
5290 field
= duplicate_decls (decl
, field
,
5291 /*newdecl_is_friend=*/false);
5292 if (field
== error_mark_node
)
5293 return error_mark_node
;
5300 tree field
= check_classfn (context
, decl
,
5302 ? current_template_parms
5304 if (field
&& field
!= error_mark_node
5305 && duplicate_decls (decl
, field
,
5306 /*newdecl_is_friend=*/false))
5310 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
5311 DECL_IN_AGGR_P (decl
) = 0;
5312 /* Do not mark DECL as an explicit specialization if it was not
5313 already marked as an instantiation; a declaration should
5314 never be marked as a specialization unless we know what
5315 template is being specialized. */
5316 if (DECL_LANG_SPECIFIC (decl
) && DECL_USE_TEMPLATE (decl
))
5318 SET_DECL_TEMPLATE_SPECIALIZATION (decl
);
5319 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5320 DECL_COMDAT (decl
) = (TREE_PUBLIC (decl
)
5321 && DECL_DECLARED_INLINE_P (decl
));
5323 DECL_COMDAT (decl
) = false;
5325 /* [temp.expl.spec] An explicit specialization of a static data
5326 member of a template is a definition if the declaration
5327 includes an initializer; otherwise, it is a declaration.
5329 We check for processing_specialization so this only applies
5330 to the new specialization syntax. */
5331 if (!initialized
&& processing_specialization
)
5332 DECL_EXTERNAL (decl
) = 1;
5335 if (DECL_EXTERNAL (decl
) && ! DECL_TEMPLATE_SPECIALIZATION (decl
)
5336 /* Aliases are definitions. */
5338 permerror (declarator
->id_loc
,
5339 "declaration of %q#D outside of class is not definition",
5343 was_public
= TREE_PUBLIC (decl
);
5345 /* Enter this declaration into the symbol table. Don't push the plain
5346 VAR_DECL for a variable template. */
5347 if (!template_parm_scope_p ()
5349 decl
= maybe_push_decl (decl
);
5351 if (processing_template_decl
)
5353 /* Make sure that for a `constinit' decl push_template_decl creates
5354 a DECL_TEMPLATE_INFO info for us, so that cp_finish_decl can then set
5355 TINFO_VAR_DECLARED_CONSTINIT. */
5356 if (decl_spec_seq_has_spec_p (declspecs
, ds_constinit
))
5357 retrofit_lang_decl (decl
);
5358 decl
= push_template_decl (decl
);
5360 if (decl
== error_mark_node
)
5361 return error_mark_node
;
5364 && DECL_NAMESPACE_SCOPE_P (decl
) && !TREE_PUBLIC (decl
) && !was_public
5365 && !DECL_THIS_STATIC (decl
) && !DECL_ARTIFICIAL (decl
))
5367 /* This is a const variable with implicit 'static'. Set
5368 DECL_THIS_STATIC so we can tell it from variables that are
5369 !TREE_PUBLIC because of the anonymous namespace. */
5370 gcc_assert (CP_TYPE_CONST_P (TREE_TYPE (decl
)) || errorcount
);
5371 DECL_THIS_STATIC (decl
) = 1;
5374 if (current_function_decl
&& VAR_P (decl
)
5375 && DECL_DECLARED_CONSTEXPR_P (current_function_decl
))
5378 if (CP_DECL_THREAD_LOCAL_P (decl
))
5379 error_at (DECL_SOURCE_LOCATION (decl
),
5380 "%qD declared %<thread_local%> in %<constexpr%> function",
5382 else if (TREE_STATIC (decl
))
5383 error_at (DECL_SOURCE_LOCATION (decl
),
5384 "%qD declared %<static%> in %<constexpr%> function", decl
);
5388 cp_function_chain
->invalid_constexpr
= true;
5391 if (!processing_template_decl
&& VAR_P (decl
))
5392 start_decl_1 (decl
, initialized
);
5397 /* Process the declaration of a variable DECL. INITIALIZED is true
5398 iff DECL is explicitly initialized. (INITIALIZED is false if the
5399 variable is initialized via an implicitly-called constructor.)
5400 This function must be called for ordinary variables (including, for
5401 example, implicit instantiations of templates), but must not be
5402 called for template declarations. */
5405 start_decl_1 (tree decl
, bool initialized
)
5409 bool aggregate_definition_p
;
5411 gcc_assert (!processing_template_decl
);
5413 if (error_operand_p (decl
))
5416 gcc_assert (VAR_P (decl
));
5418 type
= TREE_TYPE (decl
);
5419 complete_p
= COMPLETE_TYPE_P (type
);
5420 aggregate_definition_p
= MAYBE_CLASS_TYPE_P (type
) && !DECL_EXTERNAL (decl
);
5422 /* If an explicit initializer is present, or if this is a definition
5423 of an aggregate, then we need a complete type at this point.
5424 (Scalars are always complete types, so there is nothing to
5425 check.) This code just sets COMPLETE_P; errors (if necessary)
5426 are issued below. */
5427 if ((initialized
|| aggregate_definition_p
)
5429 && COMPLETE_TYPE_P (complete_type (type
)))
5432 /* We will not yet have set TREE_READONLY on DECL if the type
5433 was "const", but incomplete, before this point. But, now, we
5434 have a complete type, so we can try again. */
5435 cp_apply_type_quals_to_decl (cp_type_quals (type
), decl
);
5439 /* Is it valid for this decl to have an initializer at all? */
5441 /* Don't allow initializations for incomplete types except for
5442 arrays which might be completed by the initialization. */
5444 ; /* A complete type is ok. */
5445 else if (type_uses_auto (type
))
5446 ; /* An auto type is ok. */
5447 else if (TREE_CODE (type
) != ARRAY_TYPE
)
5449 error ("variable %q#D has initializer but incomplete type", decl
);
5450 type
= TREE_TYPE (decl
) = error_mark_node
;
5452 else if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type
))))
5454 if (DECL_LANG_SPECIFIC (decl
) && DECL_TEMPLATE_INFO (decl
))
5455 error ("elements of array %q#D have incomplete type", decl
);
5456 /* else we already gave an error in start_decl. */
5459 else if (aggregate_definition_p
&& !complete_p
)
5461 if (type_uses_auto (type
))
5462 gcc_assert (CLASS_PLACEHOLDER_TEMPLATE (type
));
5465 error ("aggregate %q#D has incomplete type and cannot be defined",
5467 /* Change the type so that assemble_variable will give
5468 DECL an rtl we can live with: (mem (const_int 0)). */
5469 type
= TREE_TYPE (decl
) = error_mark_node
;
5473 /* Create a new scope to hold this declaration if necessary.
5474 Whether or not a new scope is necessary cannot be determined
5475 until after the type has been completed; if the type is a
5476 specialization of a class template it is not until after
5477 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
5478 will be set correctly. */
5479 maybe_push_cleanup_level (type
);
5482 /* Handle initialization of references. DECL, TYPE, and INIT have the
5483 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
5484 but will be set to a new CLEANUP_STMT if a temporary is created
5485 that must be destroyed subsequently.
5487 Returns an initializer expression to use to initialize DECL, or
5488 NULL if the initialization can be performed statically.
5490 Quotes on semantics can be found in ARM 8.4.3. */
5493 grok_reference_init (tree decl
, tree type
, tree init
, int flags
)
5495 if (init
== NULL_TREE
)
5497 if ((DECL_LANG_SPECIFIC (decl
) == 0
5498 || DECL_IN_AGGR_P (decl
) == 0)
5499 && ! DECL_THIS_EXTERN (decl
))
5500 error_at (DECL_SOURCE_LOCATION (decl
),
5501 "%qD declared as reference but not initialized", decl
);
5505 if (TREE_CODE (init
) == TREE_LIST
)
5506 init
= build_x_compound_expr_from_list (init
, ELK_INIT
,
5507 tf_warning_or_error
);
5509 tree ttype
= TREE_TYPE (type
);
5510 if (TREE_CODE (ttype
) != ARRAY_TYPE
5511 && TREE_CODE (TREE_TYPE (init
)) == ARRAY_TYPE
)
5512 /* Note: default conversion is only called in very special cases. */
5513 init
= decay_conversion (init
, tf_warning_or_error
);
5515 /* check_initializer handles this for non-reference variables, but for
5516 references we need to do it here or the initializer will get the
5517 incomplete array type and confuse later calls to
5518 cp_complete_array_type. */
5519 if (TREE_CODE (ttype
) == ARRAY_TYPE
5520 && TYPE_DOMAIN (ttype
) == NULL_TREE
5521 && (BRACE_ENCLOSED_INITIALIZER_P (init
)
5522 || TREE_CODE (init
) == STRING_CST
))
5524 cp_complete_array_type (&ttype
, init
, false);
5525 if (ttype
!= TREE_TYPE (type
))
5526 type
= cp_build_reference_type (ttype
, TYPE_REF_IS_RVALUE (type
));
5529 /* Convert INIT to the reference type TYPE. This may involve the
5530 creation of a temporary, whose lifetime must be the same as that
5531 of the reference. If so, a DECL_EXPR for the temporary will be
5532 added just after the DECL_EXPR for DECL. That's why we don't set
5533 DECL_INITIAL for local references (instead assigning to them
5534 explicitly); we need to allow the temporary to be initialized
5536 return initialize_reference (type
, init
, flags
,
5537 tf_warning_or_error
);
5540 /* Designated initializers in arrays are not supported in GNU C++.
5541 The parser cannot detect this error since it does not know whether
5542 a given brace-enclosed initializer is for a class type or for an
5543 array. This function checks that CE does not use a designated
5544 initializer. If it does, an error is issued. Returns true if CE
5545 is valid, i.e., does not have a designated initializer. */
5548 check_array_designated_initializer (constructor_elt
*ce
,
5549 unsigned HOST_WIDE_INT index
)
5551 /* Designated initializers for array elements are not supported. */
5554 /* The parser only allows identifiers as designated
5556 if (ce
->index
== error_mark_node
)
5558 error ("name used in a GNU-style designated "
5559 "initializer for an array");
5562 else if (identifier_p (ce
->index
))
5564 error ("name %qD used in a GNU-style designated "
5565 "initializer for an array", ce
->index
);
5569 tree ce_index
= build_expr_type_conversion (WANT_INT
| WANT_ENUM
,
5572 && INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (ce_index
))
5573 && (TREE_CODE (ce_index
= fold_non_dependent_expr (ce_index
))
5576 /* A C99 designator is OK if it matches the current index. */
5577 if (wi::to_wide (ce_index
) == index
)
5579 ce
->index
= ce_index
;
5583 sorry ("non-trivial designated initializers not supported");
5586 error_at (cp_expr_loc_or_input_loc (ce
->index
),
5587 "C99 designator %qE is not an integral constant-expression",
5596 /* When parsing `int a[] = {1, 2};' we don't know the size of the
5597 array until we finish parsing the initializer. If that's the
5598 situation we're in, update DECL accordingly. */
5601 maybe_deduce_size_from_array_init (tree decl
, tree init
)
5603 tree type
= TREE_TYPE (decl
);
5605 if (TREE_CODE (type
) == ARRAY_TYPE
5606 && TYPE_DOMAIN (type
) == NULL_TREE
5607 && TREE_CODE (decl
) != TYPE_DECL
)
5609 /* do_default is really a C-ism to deal with tentative definitions.
5610 But let's leave it here to ease the eventual merge. */
5611 int do_default
= !DECL_EXTERNAL (decl
);
5612 tree initializer
= init
? init
: DECL_INITIAL (decl
);
5615 /* Check that there are no designated initializers in INIT, as
5616 those are not supported in GNU C++, and as the middle-end
5617 will crash if presented with a non-numeric designated
5619 if (initializer
&& BRACE_ENCLOSED_INITIALIZER_P (initializer
))
5621 vec
<constructor_elt
, va_gc
> *v
= CONSTRUCTOR_ELTS (initializer
);
5622 constructor_elt
*ce
;
5624 FOR_EACH_VEC_SAFE_ELT (v
, i
, ce
)
5626 if (instantiation_dependent_expression_p (ce
->index
))
5628 if (!check_array_designated_initializer (ce
, i
))
5634 TREE_TYPE (decl
) = error_mark_node
;
5637 failure
= cp_complete_array_type (&TREE_TYPE (decl
), initializer
,
5641 error_at (cp_expr_loc_or_loc (initializer
,
5642 DECL_SOURCE_LOCATION (decl
)),
5643 "initializer fails to determine size of %qD", decl
);
5645 else if (failure
== 2)
5649 error_at (DECL_SOURCE_LOCATION (decl
),
5650 "array size missing in %qD", decl
);
5652 /* If a `static' var's size isn't known, make it extern as
5653 well as static, so it does not get allocated. If it's not
5654 `static', then don't mark it extern; finish_incomplete_decl
5655 will give it a default size and it will get allocated. */
5656 else if (!pedantic
&& TREE_STATIC (decl
) && !TREE_PUBLIC (decl
))
5657 DECL_EXTERNAL (decl
) = 1;
5659 else if (failure
== 3)
5661 error_at (DECL_SOURCE_LOCATION (decl
),
5662 "zero-size array %qD", decl
);
5666 cp_apply_type_quals_to_decl (cp_type_quals (TREE_TYPE (decl
)), decl
);
5668 relayout_decl (decl
);
5672 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
5673 any appropriate error messages regarding the layout. */
5676 layout_var_decl (tree decl
)
5680 type
= TREE_TYPE (decl
);
5681 if (type
== error_mark_node
)
5684 /* If we haven't already laid out this declaration, do so now.
5685 Note that we must not call complete type for an external object
5686 because it's type might involve templates that we are not
5687 supposed to instantiate yet. (And it's perfectly valid to say
5688 `extern X x' for some incomplete type `X'.) */
5689 if (!DECL_EXTERNAL (decl
))
5690 complete_type (type
);
5691 if (!DECL_SIZE (decl
)
5692 && TREE_TYPE (decl
) != error_mark_node
5693 && complete_or_array_type_p (type
))
5694 layout_decl (decl
, 0);
5696 if (!DECL_EXTERNAL (decl
) && DECL_SIZE (decl
) == NULL_TREE
)
5698 /* An automatic variable with an incomplete type: that is an error.
5699 Don't talk about array types here, since we took care of that
5700 message in grokdeclarator. */
5701 error_at (DECL_SOURCE_LOCATION (decl
),
5702 "storage size of %qD isn%'t known", decl
);
5703 TREE_TYPE (decl
) = error_mark_node
;
5706 /* Keep this code around in case we later want to control debug info
5707 based on whether a type is "used". (jason 1999-11-11) */
5709 else if (!DECL_EXTERNAL (decl
) && MAYBE_CLASS_TYPE_P (ttype
))
5710 /* Let debugger know it should output info for this type. */
5711 note_debug_info_needed (ttype
);
5713 if (TREE_STATIC (decl
) && DECL_CLASS_SCOPE_P (decl
))
5714 note_debug_info_needed (DECL_CONTEXT (decl
));
5717 if ((DECL_EXTERNAL (decl
) || TREE_STATIC (decl
))
5718 && DECL_SIZE (decl
) != NULL_TREE
5719 && ! TREE_CONSTANT (DECL_SIZE (decl
)))
5721 if (TREE_CODE (DECL_SIZE (decl
)) == INTEGER_CST
)
5722 constant_expression_warning (DECL_SIZE (decl
));
5725 error_at (DECL_SOURCE_LOCATION (decl
),
5726 "storage size of %qD isn%'t constant", decl
);
5727 TREE_TYPE (decl
) = error_mark_node
;
5732 /* If a local static variable is declared in an inline function, or if
5733 we have a weak definition, we must endeavor to create only one
5734 instance of the variable at link-time. */
5737 maybe_commonize_var (tree decl
)
5739 /* Don't mess with __FUNCTION__ and similar. */
5740 if (DECL_ARTIFICIAL (decl
))
5743 /* Static data in a function with comdat linkage also has comdat
5745 if ((TREE_STATIC (decl
)
5746 && DECL_FUNCTION_SCOPE_P (decl
)
5747 && vague_linkage_p (DECL_CONTEXT (decl
)))
5748 || (TREE_PUBLIC (decl
) && DECL_INLINE_VAR_P (decl
)))
5752 /* With weak symbols, we simply make the variable COMDAT;
5753 that will cause copies in multiple translations units to
5755 comdat_linkage (decl
);
5759 if (DECL_INITIAL (decl
) == NULL_TREE
5760 || DECL_INITIAL (decl
) == error_mark_node
)
5762 /* Without weak symbols, we can use COMMON to merge
5763 uninitialized variables. */
5764 TREE_PUBLIC (decl
) = 1;
5765 DECL_COMMON (decl
) = 1;
5769 /* While for initialized variables, we must use internal
5770 linkage -- which means that multiple copies will not
5772 TREE_PUBLIC (decl
) = 0;
5773 DECL_COMMON (decl
) = 0;
5774 DECL_INTERFACE_KNOWN (decl
) = 1;
5776 if (DECL_INLINE_VAR_P (decl
))
5777 msg
= G_("sorry: semantics of inline variable "
5778 "%q#D are wrong (you%'ll wind up with "
5779 "multiple copies)");
5781 msg
= G_("sorry: semantics of inline function "
5782 "static data %q#D are wrong (you%'ll wind "
5783 "up with multiple copies)");
5784 if (warning_at (DECL_SOURCE_LOCATION (decl
), 0,
5786 inform (DECL_SOURCE_LOCATION (decl
),
5787 "you can work around this by removing the initializer");
5793 /* Issue an error message if DECL is an uninitialized const variable.
5794 CONSTEXPR_CONTEXT_P is true when the function is called in a constexpr
5795 context from potential_constant_expression. Returns true if all is well,
5799 check_for_uninitialized_const_var (tree decl
, bool constexpr_context_p
,
5800 tsubst_flags_t complain
)
5802 tree type
= strip_array_types (TREE_TYPE (decl
));
5804 /* ``Unless explicitly declared extern, a const object does not have
5805 external linkage and must be initialized. ($8.4; $12.1)'' ARM
5808 && !TYPE_REF_P (type
)
5809 && (constexpr_context_p
5810 || CP_TYPE_CONST_P (type
) || var_in_constexpr_fn (decl
))
5811 && !DECL_NONTRIVIALLY_INITIALIZED_P (decl
))
5813 tree field
= default_init_uninitialized_part (type
);
5817 bool show_notes
= true;
5819 if (!constexpr_context_p
)
5821 if (CP_TYPE_CONST_P (type
))
5823 if (complain
& tf_error
)
5824 show_notes
= permerror (DECL_SOURCE_LOCATION (decl
),
5825 "uninitialized %<const %D%>", decl
);
5829 if (!is_instantiation_of_constexpr (current_function_decl
)
5830 && (complain
& tf_error
))
5831 error_at (DECL_SOURCE_LOCATION (decl
),
5832 "uninitialized variable %qD in %<constexpr%> "
5836 cp_function_chain
->invalid_constexpr
= true;
5839 else if (complain
& tf_error
)
5840 error_at (DECL_SOURCE_LOCATION (decl
),
5841 "uninitialized variable %qD in %<constexpr%> context",
5844 if (show_notes
&& CLASS_TYPE_P (type
) && (complain
& tf_error
))
5846 tree defaulted_ctor
;
5848 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (type
)),
5849 "%q#T has no user-provided default constructor", type
);
5850 defaulted_ctor
= in_class_defaulted_default_constructor (type
);
5852 inform (DECL_SOURCE_LOCATION (defaulted_ctor
),
5853 "constructor is not user-provided because it is "
5854 "explicitly defaulted in the class body");
5855 inform (DECL_SOURCE_LOCATION (field
),
5856 "and the implicitly-defined constructor does not "
5857 "initialize %q#D", field
);
5866 /* Structure holding the current initializer being processed by reshape_init.
5867 CUR is a pointer to the current element being processed, END is a pointer
5868 after the last element present in the initializer. */
5871 constructor_elt
*cur
;
5872 constructor_elt
*end
;
5875 static tree
reshape_init_r (tree
, reshape_iter
*, bool, tsubst_flags_t
);
5877 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
5878 returned is the next FIELD_DECL (possibly FIELD itself) that can be
5879 initialized. If there are no more such fields, the return value
5883 next_initializable_field (tree field
)
5886 && (TREE_CODE (field
) != FIELD_DECL
5887 || DECL_UNNAMED_BIT_FIELD (field
)
5888 || (DECL_ARTIFICIAL (field
)
5889 && !(cxx_dialect
>= cxx17
&& DECL_FIELD_IS_BASE (field
)))))
5890 field
= DECL_CHAIN (field
);
5895 /* Return true for [dcl.init.list] direct-list-initialization from
5896 single element of enumeration with a fixed underlying type. */
5899 is_direct_enum_init (tree type
, tree init
)
5901 if (cxx_dialect
>= cxx17
5902 && TREE_CODE (type
) == ENUMERAL_TYPE
5903 && ENUM_FIXED_UNDERLYING_TYPE_P (type
)
5904 && TREE_CODE (init
) == CONSTRUCTOR
5905 && CONSTRUCTOR_IS_DIRECT_INIT (init
)
5906 && CONSTRUCTOR_NELTS (init
) == 1)
5911 /* Subroutine of reshape_init_array and reshape_init_vector, which does
5912 the actual work. ELT_TYPE is the element type of the array. MAX_INDEX is an
5913 INTEGER_CST representing the size of the array minus one (the maximum index),
5914 or NULL_TREE if the array was declared without specifying the size. D is
5915 the iterator within the constructor. */
5918 reshape_init_array_1 (tree elt_type
, tree max_index
, reshape_iter
*d
,
5919 tsubst_flags_t complain
)
5922 bool sized_array_p
= (max_index
&& TREE_CONSTANT (max_index
));
5923 unsigned HOST_WIDE_INT max_index_cst
= 0;
5924 unsigned HOST_WIDE_INT index
;
5926 /* The initializer for an array is always a CONSTRUCTOR. */
5927 new_init
= build_constructor (init_list_type_node
, NULL
);
5931 /* Minus 1 is used for zero sized arrays. */
5932 if (integer_all_onesp (max_index
))
5935 if (tree_fits_uhwi_p (max_index
))
5936 max_index_cst
= tree_to_uhwi (max_index
);
5937 /* sizetype is sign extended, not zero extended. */
5939 max_index_cst
= tree_to_uhwi (fold_convert (size_type_node
, max_index
));
5942 /* Set to the index of the last element with a non-zero initializer.
5943 Zero initializers for elements past this one can be dropped. */
5944 unsigned HOST_WIDE_INT last_nonzero
= -1;
5945 /* Loop until there are no more initializers. */
5947 d
->cur
!= d
->end
&& (!sized_array_p
|| index
<= max_index_cst
);
5951 constructor_elt
*old_cur
= d
->cur
;
5953 check_array_designated_initializer (d
->cur
, index
);
5954 elt_init
= reshape_init_r (elt_type
, d
, /*first_initializer_p=*/false,
5956 if (elt_init
== error_mark_node
)
5957 return error_mark_node
;
5958 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init
),
5959 size_int (index
), elt_init
);
5960 if (!TREE_CONSTANT (elt_init
))
5961 TREE_CONSTANT (new_init
) = false;
5963 /* Pointers initialized to strings must be treated as non-zero
5964 even if the string is empty. */
5965 tree init_type
= TREE_TYPE (elt_init
);
5966 if ((POINTER_TYPE_P (elt_type
) != POINTER_TYPE_P (init_type
)))
5967 last_nonzero
= index
;
5968 else if (!type_initializer_zero_p (elt_type
, elt_init
))
5969 last_nonzero
= index
;
5971 /* This can happen with an invalid initializer (c++/54501). */
5972 if (d
->cur
== old_cur
&& !sized_array_p
)
5976 if (sized_array_p
&& trivial_type_p (elt_type
))
5978 /* Strip trailing zero-initializers from an array of a trivial
5979 type of known size. They are redundant and get in the way
5980 of telling them apart from those with implicit zero value. */
5981 unsigned HOST_WIDE_INT nelts
= CONSTRUCTOR_NELTS (new_init
);
5982 if (last_nonzero
> nelts
)
5984 else if (last_nonzero
< nelts
- 1)
5985 nelts
= last_nonzero
+ 1;
5987 vec_safe_truncate (CONSTRUCTOR_ELTS (new_init
), nelts
);
5993 /* Subroutine of reshape_init_r, processes the initializers for arrays.
5994 Parameters are the same of reshape_init_r. */
5997 reshape_init_array (tree type
, reshape_iter
*d
, tsubst_flags_t complain
)
5999 tree max_index
= NULL_TREE
;
6001 gcc_assert (TREE_CODE (type
) == ARRAY_TYPE
);
6003 if (TYPE_DOMAIN (type
))
6004 max_index
= array_type_nelts (type
);
6006 return reshape_init_array_1 (TREE_TYPE (type
), max_index
, d
, complain
);
6009 /* Subroutine of reshape_init_r, processes the initializers for vectors.
6010 Parameters are the same of reshape_init_r. */
6013 reshape_init_vector (tree type
, reshape_iter
*d
, tsubst_flags_t complain
)
6015 tree max_index
= NULL_TREE
;
6017 gcc_assert (VECTOR_TYPE_P (type
));
6019 if (COMPOUND_LITERAL_P (d
->cur
->value
))
6021 tree value
= d
->cur
->value
;
6022 if (!same_type_p (TREE_TYPE (value
), type
))
6024 if (complain
& tf_error
)
6025 error ("invalid type %qT as initializer for a vector of type %qT",
6026 TREE_TYPE (d
->cur
->value
), type
);
6027 value
= error_mark_node
;
6033 /* For a vector, we initialize it as an array of the appropriate size. */
6034 if (VECTOR_TYPE_P (type
))
6035 max_index
= size_int (TYPE_VECTOR_SUBPARTS (type
) - 1);
6037 return reshape_init_array_1 (TREE_TYPE (type
), max_index
, d
, complain
);
6040 /* Subroutine of reshape_init_r, processes the initializers for classes
6041 or union. Parameters are the same of reshape_init_r. */
6044 reshape_init_class (tree type
, reshape_iter
*d
, bool first_initializer_p
,
6045 tsubst_flags_t complain
)
6050 gcc_assert (CLASS_TYPE_P (type
));
6052 /* The initializer for a class is always a CONSTRUCTOR. */
6053 new_init
= build_constructor (init_list_type_node
, NULL
);
6054 field
= next_initializable_field (TYPE_FIELDS (type
));
6060 An initializer for an aggregate member that is an
6061 empty class shall have the form of an empty
6062 initializer-list {}. */
6063 if (!first_initializer_p
)
6065 if (complain
& tf_error
)
6066 error ("initializer for %qT must be brace-enclosed", type
);
6067 return error_mark_node
;
6072 /* Loop through the initializable fields, gathering initializers. */
6073 while (d
->cur
!= d
->end
)
6076 constructor_elt
*old_cur
= d
->cur
;
6078 /* Handle designated initializers, as an extension. */
6081 if (d
->cur
->index
== error_mark_node
)
6082 return error_mark_node
;
6084 if (TREE_CODE (d
->cur
->index
) == FIELD_DECL
)
6086 /* We already reshaped this. */
6087 if (field
!= d
->cur
->index
)
6089 tree id
= DECL_NAME (d
->cur
->index
);
6091 gcc_checking_assert (d
->cur
->index
6092 == get_class_binding (type
, id
));
6093 field
= d
->cur
->index
;
6096 else if (TREE_CODE (d
->cur
->index
) == IDENTIFIER_NODE
)
6097 field
= get_class_binding (type
, d
->cur
->index
);
6100 if (complain
& tf_error
)
6101 error ("%<[%E] =%> used in a GNU-style designated initializer"
6102 " for class %qT", d
->cur
->index
, type
);
6103 return error_mark_node
;
6106 if (!field
|| TREE_CODE (field
) != FIELD_DECL
)
6108 if (complain
& tf_error
)
6109 error ("%qT has no non-static data member named %qD", type
,
6111 return error_mark_node
;
6115 /* If we processed all the member of the class, we are done. */
6119 field_init
= reshape_init_r (TREE_TYPE (field
), d
,
6120 /*first_initializer_p=*/false, complain
);
6121 if (field_init
== error_mark_node
)
6122 return error_mark_node
;
6124 if (d
->cur
== old_cur
&& d
->cur
->index
)
6126 /* This can happen with an invalid initializer for a flexible
6127 array member (c++/54441). */
6128 if (complain
& tf_error
)
6129 error ("invalid initializer for %q#D", field
);
6130 return error_mark_node
;
6133 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init
), field
, field_init
);
6137 When a union is initialized with a brace-enclosed
6138 initializer, the braces shall only contain an
6139 initializer for the first member of the union. */
6140 if (TREE_CODE (type
) == UNION_TYPE
)
6143 field
= next_initializable_field (DECL_CHAIN (field
));
6149 /* Subroutine of reshape_init_r. We're in a context where C99 initializer
6150 designators are not valid; either complain or return true to indicate
6151 that reshape_init_r should return error_mark_node. */
6154 has_designator_problem (reshape_iter
*d
, tsubst_flags_t complain
)
6158 if (complain
& tf_error
)
6159 error_at (cp_expr_loc_or_input_loc (d
->cur
->index
),
6160 "C99 designator %qE outside aggregate initializer",
6168 /* Subroutine of reshape_init, which processes a single initializer (part of
6169 a CONSTRUCTOR). TYPE is the type of the variable being initialized, D is the
6170 iterator within the CONSTRUCTOR which points to the initializer to process.
6171 FIRST_INITIALIZER_P is true if this is the first initializer of the
6172 outermost CONSTRUCTOR node. */
6175 reshape_init_r (tree type
, reshape_iter
*d
, bool first_initializer_p
,
6176 tsubst_flags_t complain
)
6178 tree init
= d
->cur
->value
;
6180 if (error_operand_p (init
))
6181 return error_mark_node
;
6183 if (first_initializer_p
&& !CP_AGGREGATE_TYPE_P (type
)
6184 && has_designator_problem (d
, complain
))
6185 return error_mark_node
;
6187 tree stripped_init
= tree_strip_any_location_wrapper (init
);
6189 if (TREE_CODE (type
) == COMPLEX_TYPE
)
6191 /* A complex type can be initialized from one or two initializers,
6192 but braces are not elided. */
6194 if (BRACE_ENCLOSED_INITIALIZER_P (stripped_init
))
6196 if (CONSTRUCTOR_NELTS (stripped_init
) > 2)
6198 if (complain
& tf_error
)
6199 error ("too many initializers for %qT", type
);
6201 return error_mark_node
;
6204 else if (first_initializer_p
&& d
->cur
!= d
->end
)
6206 vec
<constructor_elt
, va_gc
> *v
= 0;
6207 CONSTRUCTOR_APPEND_ELT (v
, NULL_TREE
, init
);
6208 CONSTRUCTOR_APPEND_ELT (v
, NULL_TREE
, d
->cur
->value
);
6209 if (has_designator_problem (d
, complain
))
6210 return error_mark_node
;
6212 init
= build_constructor (init_list_type_node
, v
);
6217 /* A non-aggregate type is always initialized with a single
6219 if (!CP_AGGREGATE_TYPE_P (type
))
6221 /* It is invalid to initialize a non-aggregate type with a
6222 brace-enclosed initializer before C++0x.
6223 We need to check for BRACE_ENCLOSED_INITIALIZER_P here because
6224 of g++.old-deja/g++.mike/p7626.C: a pointer-to-member constant is
6225 a CONSTRUCTOR (with a record type). */
6226 if (TREE_CODE (stripped_init
) == CONSTRUCTOR
6227 /* Don't complain about a capture-init. */
6228 && !CONSTRUCTOR_IS_DIRECT_INIT (stripped_init
)
6229 && BRACE_ENCLOSED_INITIALIZER_P (stripped_init
)) /* p7626.C */
6231 if (SCALAR_TYPE_P (type
))
6233 if (cxx_dialect
< cxx11
)
6235 if (complain
& tf_error
)
6236 error ("braces around scalar initializer for type %qT",
6238 init
= error_mark_node
;
6240 else if (first_initializer_p
6241 || (CONSTRUCTOR_NELTS (stripped_init
) > 0
6242 && (BRACE_ENCLOSED_INITIALIZER_P
6243 (CONSTRUCTOR_ELT (stripped_init
,0)->value
))))
6245 if (complain
& tf_error
)
6246 error ("too many braces around scalar initializer"
6247 "for type %qT", type
);
6248 init
= error_mark_node
;
6252 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS
);
6259 /* "If T is a class type and the initializer list has a single element of
6260 type cv U, where U is T or a class derived from T, the object is
6261 initialized from that element." Even if T is an aggregate. */
6262 if (cxx_dialect
>= cxx11
&& (CLASS_TYPE_P (type
) || VECTOR_TYPE_P (type
))
6263 && first_initializer_p
6264 && d
->end
- d
->cur
== 1
6265 && reference_related_p (type
, TREE_TYPE (init
)))
6273 All implicit type conversions (clause _conv_) are considered when
6274 initializing the aggregate member with an initializer from an
6275 initializer-list. If the initializer can initialize a member,
6276 the member is initialized. Otherwise, if the member is itself a
6277 non-empty subaggregate, brace elision is assumed and the
6278 initializer is considered for the initialization of the first
6279 member of the subaggregate. */
6280 if (TREE_CODE (init
) != CONSTRUCTOR
6281 /* But don't try this for the first initializer, since that would be
6282 looking through the outermost braces; A a2 = { a1 }; is not a
6283 valid aggregate initialization. */
6284 && !first_initializer_p
6285 && (same_type_ignoring_top_level_qualifiers_p (type
, TREE_TYPE (init
))
6286 || can_convert_arg (type
, TREE_TYPE (init
), init
, LOOKUP_NORMAL
,
6293 /* [dcl.init.string]
6295 A char array (whether plain char, signed char, or unsigned char)
6296 can be initialized by a string-literal (optionally enclosed in
6297 braces); a wchar_t array can be initialized by a wide
6298 string-literal (optionally enclosed in braces). */
6299 if (TREE_CODE (type
) == ARRAY_TYPE
6300 && char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (type
))))
6302 tree str_init
= init
;
6303 tree stripped_str_init
= stripped_init
;
6305 /* Strip one level of braces if and only if they enclose a single
6306 element (as allowed by [dcl.init.string]). */
6307 if (!first_initializer_p
6308 && TREE_CODE (stripped_str_init
) == CONSTRUCTOR
6309 && CONSTRUCTOR_NELTS (stripped_str_init
) == 1)
6311 str_init
= (*CONSTRUCTOR_ELTS (stripped_str_init
))[0].value
;
6312 stripped_str_init
= tree_strip_any_location_wrapper (str_init
);
6315 /* If it's a string literal, then it's the initializer for the array
6316 as a whole. Otherwise, continue with normal initialization for
6317 array types (one value per array element). */
6318 if (TREE_CODE (stripped_str_init
) == STRING_CST
)
6320 if (has_designator_problem (d
, complain
))
6321 return error_mark_node
;
6327 /* The following cases are about aggregates. If we are not within a full
6328 initializer already, and there is not a CONSTRUCTOR, it means that there
6329 is a missing set of braces (that is, we are processing the case for
6330 which reshape_init exists). */
6331 if (!first_initializer_p
)
6333 if (TREE_CODE (stripped_init
) == CONSTRUCTOR
)
6335 tree init_type
= TREE_TYPE (init
);
6336 if (init_type
&& TYPE_PTRMEMFUNC_P (init_type
))
6337 /* There is no need to call reshape_init for pointer-to-member
6338 function initializers, as they are always constructed correctly
6339 by the front end. Here we have e.g. {.__pfn=0B, .__delta=0},
6340 which is missing outermost braces. We should warn below, and
6341 one of the routines below will wrap it in additional { }. */;
6342 /* For a nested compound literal, there is no need to reshape since
6343 we called reshape_init in finish_compound_literal, before calling
6345 else if (COMPOUND_LITERAL_P (stripped_init
)
6346 /* Similarly, a CONSTRUCTOR of the target's type is a
6347 previously digested initializer. */
6348 || same_type_ignoring_top_level_qualifiers_p (type
,
6352 gcc_assert (!BRACE_ENCLOSED_INITIALIZER_P (stripped_init
));
6357 /* Something that hasn't been reshaped yet. */
6359 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (stripped_init
));
6360 return reshape_init (type
, init
, complain
);
6364 if (complain
& tf_warning
)
6365 warning (OPT_Wmissing_braces
,
6366 "missing braces around initializer for %qT",
6370 /* Dispatch to specialized routines. */
6371 if (CLASS_TYPE_P (type
))
6372 return reshape_init_class (type
, d
, first_initializer_p
, complain
);
6373 else if (TREE_CODE (type
) == ARRAY_TYPE
)
6374 return reshape_init_array (type
, d
, complain
);
6375 else if (VECTOR_TYPE_P (type
))
6376 return reshape_init_vector (type
, d
, complain
);
6381 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
6382 brace-enclosed aggregate initializer.
6384 INIT is the CONSTRUCTOR containing the list of initializers describing
6385 a brace-enclosed initializer for an entity of the indicated aggregate TYPE.
6386 It may not presently match the shape of the TYPE; for example:
6388 struct S { int a; int b; };
6389 struct S a[] = { 1, 2, 3, 4 };
6391 Here INIT will hold a vector of four elements, rather than a
6392 vector of two elements, each itself a vector of two elements. This
6393 routine transforms INIT from the former form into the latter. The
6394 revised CONSTRUCTOR node is returned. */
6397 reshape_init (tree type
, tree init
, tsubst_flags_t complain
)
6399 vec
<constructor_elt
, va_gc
> *v
;
6403 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init
));
6405 v
= CONSTRUCTOR_ELTS (init
);
6407 /* An empty constructor does not need reshaping, and it is always a valid
6409 if (vec_safe_is_empty (v
))
6412 /* Handle [dcl.init.list] direct-list-initialization from
6413 single element of enumeration with a fixed underlying type. */
6414 if (is_direct_enum_init (type
, init
))
6416 tree elt
= CONSTRUCTOR_ELT (init
, 0)->value
;
6417 type
= cv_unqualified (type
);
6418 if (check_narrowing (ENUM_UNDERLYING_TYPE (type
), elt
, complain
))
6420 warning_sentinel
w (warn_useless_cast
);
6421 warning_sentinel
w2 (warn_ignored_qualifiers
);
6422 return cp_build_c_cast (type
, elt
, tf_warning_or_error
);
6425 return error_mark_node
;
6428 /* Recurse on this CONSTRUCTOR. */
6430 d
.end
= d
.cur
+ v
->length ();
6432 new_init
= reshape_init_r (type
, &d
, true, complain
);
6433 if (new_init
== error_mark_node
)
6434 return error_mark_node
;
6436 /* Make sure all the element of the constructor were used. Otherwise,
6437 issue an error about exceeding initializers. */
6440 if (complain
& tf_error
)
6441 error ("too many initializers for %qT", type
);
6442 return error_mark_node
;
6445 if (CONSTRUCTOR_IS_DIRECT_INIT (init
)
6446 && BRACE_ENCLOSED_INITIALIZER_P (new_init
))
6447 CONSTRUCTOR_IS_DIRECT_INIT (new_init
) = true;
6448 if (CONSTRUCTOR_IS_DESIGNATED_INIT (init
)
6449 && BRACE_ENCLOSED_INITIALIZER_P (new_init
))
6450 CONSTRUCTOR_IS_DESIGNATED_INIT (new_init
) = true;
6455 /* Verify array initializer. Returns true if errors have been reported. */
6458 check_array_initializer (tree decl
, tree type
, tree init
)
6460 tree element_type
= TREE_TYPE (type
);
6462 /* The array type itself need not be complete, because the
6463 initializer may tell us how many elements are in the array.
6464 But, the elements of the array must be complete. */
6465 if (!COMPLETE_TYPE_P (complete_type (element_type
)))
6468 error_at (DECL_SOURCE_LOCATION (decl
),
6469 "elements of array %q#D have incomplete type", decl
);
6471 error ("elements of array %q#T have incomplete type", type
);
6474 /* A compound literal can't have variable size. */
6476 && ((COMPLETE_TYPE_P (type
) && !TREE_CONSTANT (TYPE_SIZE (type
)))
6477 || !TREE_CONSTANT (TYPE_SIZE (element_type
))))
6479 error ("variable-sized compound literal");
6485 /* Subroutine of check_initializer; args are passed down from that function.
6486 Set stmts_are_full_exprs_p to 1 across a call to build_aggr_init. */
6489 build_aggr_init_full_exprs (tree decl
, tree init
, int flags
)
6492 gcc_assert (stmts_are_full_exprs_p ());
6493 return build_aggr_init (decl
, init
, flags
, tf_warning_or_error
);
6496 /* Verify INIT (the initializer for DECL), and record the
6497 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
6498 grok_reference_init.
6500 If the return value is non-NULL, it is an expression that must be
6501 evaluated dynamically to initialize DECL. */
6504 check_initializer (tree decl
, tree init
, int flags
, vec
<tree
, va_gc
> **cleanups
)
6507 tree init_code
= NULL
;
6510 /* Things that are going to be initialized need to have complete
6512 TREE_TYPE (decl
) = type
= complete_type (TREE_TYPE (decl
));
6514 if (DECL_HAS_VALUE_EXPR_P (decl
))
6516 /* A variable with DECL_HAS_VALUE_EXPR_P set is just a placeholder,
6517 it doesn't have storage to be initialized. */
6518 gcc_assert (init
== NULL_TREE
);
6522 if (type
== error_mark_node
)
6523 /* We will have already complained. */
6526 if (TREE_CODE (type
) == ARRAY_TYPE
)
6528 if (check_array_initializer (decl
, type
, init
))
6531 else if (!COMPLETE_TYPE_P (type
))
6533 error_at (DECL_SOURCE_LOCATION (decl
),
6534 "%q#D has incomplete type", decl
);
6535 TREE_TYPE (decl
) = error_mark_node
;
6539 /* There is no way to make a variable-sized class type in GNU C++. */
6540 gcc_assert (TREE_CONSTANT (TYPE_SIZE (type
)));
6542 if (init
&& BRACE_ENCLOSED_INITIALIZER_P (init
))
6544 int init_len
= CONSTRUCTOR_NELTS (init
);
6545 if (SCALAR_TYPE_P (type
))
6549 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS
);
6550 init
= build_zero_init (type
, NULL_TREE
, false);
6552 else if (init_len
!= 1 && TREE_CODE (type
) != COMPLEX_TYPE
)
6554 error_at (cp_expr_loc_or_loc (init
, DECL_SOURCE_LOCATION (decl
)),
6555 "scalar object %qD requires one element in "
6556 "initializer", decl
);
6557 TREE_TYPE (decl
) = error_mark_node
;
6563 if (TREE_CODE (decl
) == CONST_DECL
)
6565 gcc_assert (!TYPE_REF_P (type
));
6567 DECL_INITIAL (decl
) = init
;
6569 gcc_assert (init
!= NULL_TREE
);
6572 else if (!init
&& DECL_REALLY_EXTERN (decl
))
6574 else if (init
|| type_build_ctor_call (type
)
6575 || TYPE_REF_P (type
))
6577 if (TYPE_REF_P (type
))
6579 init
= grok_reference_init (decl
, type
, init
, flags
);
6580 flags
|= LOOKUP_ALREADY_DIGESTED
;
6583 check_for_uninitialized_const_var (decl
, /*constexpr_context_p=*/false,
6584 tf_warning_or_error
);
6585 /* Do not reshape constructors of vectors (they don't need to be
6587 else if (BRACE_ENCLOSED_INITIALIZER_P (init
))
6589 if (is_std_init_list (type
))
6591 init
= perform_implicit_conversion (type
, init
,
6592 tf_warning_or_error
);
6593 flags
|= LOOKUP_ALREADY_DIGESTED
;
6595 else if (TYPE_NON_AGGREGATE_CLASS (type
))
6597 /* Don't reshape if the class has constructors. */
6598 if (cxx_dialect
== cxx98
)
6599 error_at (cp_expr_loc_or_loc (init
, DECL_SOURCE_LOCATION (decl
)),
6600 "in C++98 %qD must be initialized by "
6601 "constructor, not by %<{...}%>",
6604 else if (VECTOR_TYPE_P (type
) && TYPE_VECTOR_OPAQUE (type
))
6606 error ("opaque vector types cannot be initialized");
6607 init
= error_mark_node
;
6611 init
= reshape_init (type
, init
, tf_warning_or_error
);
6612 flags
|= LOOKUP_NO_NARROWING
;
6615 else if (TREE_CODE (init
) == TREE_LIST
6616 && TREE_TYPE (init
) != unknown_type_node
6617 && !MAYBE_CLASS_TYPE_P (type
))
6619 gcc_assert (TREE_CODE (decl
) != RESULT_DECL
);
6621 /* We get here with code like `int a (2);' */
6622 init
= build_x_compound_expr_from_list (init
, ELK_INIT
,
6623 tf_warning_or_error
);
6626 /* If DECL has an array type without a specific bound, deduce the
6627 array size from the initializer. */
6628 maybe_deduce_size_from_array_init (decl
, init
);
6629 type
= TREE_TYPE (decl
);
6630 if (type
== error_mark_node
)
6633 if (((type_build_ctor_call (type
) || CLASS_TYPE_P (type
))
6634 && !(flags
& LOOKUP_ALREADY_DIGESTED
)
6635 && !(init
&& BRACE_ENCLOSED_INITIALIZER_P (init
)
6636 && CP_AGGREGATE_TYPE_P (type
)
6637 && (CLASS_TYPE_P (type
)
6638 || !TYPE_NEEDS_CONSTRUCTING (type
)
6639 || type_has_extended_temps (type
))))
6640 || (DECL_DECOMPOSITION_P (decl
) && TREE_CODE (type
) == ARRAY_TYPE
))
6642 init_code
= build_aggr_init_full_exprs (decl
, init
, flags
);
6644 /* A constructor call is a non-trivial initializer even if
6645 it isn't explicitly written. */
6646 if (TREE_SIDE_EFFECTS (init_code
))
6647 DECL_NONTRIVIALLY_INITIALIZED_P (decl
) = true;
6649 /* If this is a constexpr initializer, expand_default_init will
6650 have returned an INIT_EXPR rather than a CALL_EXPR. In that
6651 case, pull the initializer back out and pass it down into
6652 store_init_value. */
6653 while (TREE_CODE (init_code
) == EXPR_STMT
6654 || TREE_CODE (init_code
) == CONVERT_EXPR
)
6655 init_code
= TREE_OPERAND (init_code
, 0);
6656 if (TREE_CODE (init_code
) == INIT_EXPR
)
6658 init
= TREE_OPERAND (init_code
, 1);
6659 init_code
= NULL_TREE
;
6660 /* Don't call digest_init; it's unnecessary and will complain
6661 about aggregate initialization of non-aggregate classes. */
6662 flags
|= LOOKUP_ALREADY_DIGESTED
;
6664 else if (DECL_DECLARED_CONSTEXPR_P (decl
)
6665 || (flags
& LOOKUP_CONSTINIT
))
6667 /* Declared constexpr or constinit, but no suitable initializer;
6668 massage init appropriately so we can pass it into
6669 store_init_value for the error. */
6670 if (CLASS_TYPE_P (type
)
6671 && (!init
|| TREE_CODE (init
) == TREE_LIST
))
6673 init
= build_functional_cast (type
, init
, tf_none
);
6674 if (TREE_CODE (init
) == TARGET_EXPR
)
6675 TARGET_EXPR_DIRECT_INIT_P (init
) = true;
6677 init_code
= NULL_TREE
;
6683 if (init
&& TREE_CODE (init
) != TREE_VEC
)
6685 /* In aggregate initialization of a variable, each element
6686 initialization is a full-expression because there is no
6687 enclosing expression. */
6688 gcc_assert (stmts_are_full_exprs_p ());
6690 init_code
= store_init_value (decl
, init
, cleanups
, flags
);
6692 if (DECL_INITIAL (decl
)
6693 && TREE_CODE (DECL_INITIAL (decl
)) == CONSTRUCTOR
6694 && !vec_safe_is_empty (CONSTRUCTOR_ELTS (DECL_INITIAL (decl
))))
6696 tree elt
= CONSTRUCTOR_ELTS (DECL_INITIAL (decl
))->last ().value
;
6697 if (TREE_CODE (TREE_TYPE (elt
)) == ARRAY_TYPE
6698 && TYPE_SIZE (TREE_TYPE (elt
)) == NULL_TREE
)
6699 cp_complete_array_type (&TREE_TYPE (elt
), elt
, false);
6702 if (pedantic
&& TREE_CODE (type
) == ARRAY_TYPE
6703 && DECL_INITIAL (decl
)
6704 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
6705 && PAREN_STRING_LITERAL_P (DECL_INITIAL (decl
)))
6706 warning_at (cp_expr_loc_or_loc (DECL_INITIAL (decl
),
6707 DECL_SOURCE_LOCATION (decl
)),
6708 0, "array %qD initialized by parenthesized "
6709 "string literal %qE",
6710 decl
, DECL_INITIAL (decl
));
6716 if (CLASS_TYPE_P (core_type
= strip_array_types (type
))
6717 && (CLASSTYPE_READONLY_FIELDS_NEED_INIT (core_type
)
6718 || CLASSTYPE_REF_FIELDS_NEED_INIT (core_type
)))
6719 diagnose_uninitialized_cst_or_ref_member (core_type
, /*using_new=*/false,
6722 check_for_uninitialized_const_var (decl
, /*constexpr_context_p=*/false,
6723 tf_warning_or_error
);
6726 if (init
&& init
!= error_mark_node
)
6727 init_code
= build2 (INIT_EXPR
, type
, decl
, init
);
6731 /* We might have set these in cp_finish_decl. */
6732 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl
) = false;
6733 TREE_CONSTANT (decl
) = false;
6737 && DECL_IN_AGGR_P (decl
)
6738 && DECL_INITIALIZED_IN_CLASS_P (decl
))
6740 static int explained
= 0;
6742 if (cxx_dialect
< cxx11
)
6743 error ("initializer invalid for static member with constructor");
6744 else if (cxx_dialect
< cxx17
)
6745 error ("non-constant in-class initialization invalid for static "
6746 "member %qD", decl
);
6748 error ("non-constant in-class initialization invalid for non-inline "
6749 "static member %qD", decl
);
6752 inform (input_location
,
6753 "(an out of class initialization is required)");
6762 /* If DECL is not a local variable, give it RTL. */
6765 make_rtl_for_nonlocal_decl (tree decl
, tree init
, const char* asmspec
)
6767 int toplev
= toplevel_bindings_p ();
6770 /* Set the DECL_ASSEMBLER_NAME for the object. */
6773 /* The `register' keyword, when used together with an
6774 asm-specification, indicates that the variable should be
6775 placed in a particular register. */
6776 if (VAR_P (decl
) && DECL_REGISTER (decl
))
6778 set_user_assembler_name (decl
, asmspec
);
6779 DECL_HARD_REGISTER (decl
) = 1;
6783 if (TREE_CODE (decl
) == FUNCTION_DECL
6784 && fndecl_built_in_p (decl
, BUILT_IN_NORMAL
))
6785 set_builtin_user_assembler_name (decl
, asmspec
);
6786 set_user_assembler_name (decl
, asmspec
);
6790 /* Handle non-variables up front. */
6793 rest_of_decl_compilation (decl
, toplev
, at_eof
);
6797 /* If we see a class member here, it should be a static data
6799 if (DECL_LANG_SPECIFIC (decl
) && DECL_IN_AGGR_P (decl
))
6801 gcc_assert (TREE_STATIC (decl
));
6802 /* An in-class declaration of a static data member should be
6803 external; it is only a declaration, and not a definition. */
6804 if (init
== NULL_TREE
)
6805 gcc_assert (DECL_EXTERNAL (decl
)
6806 || !TREE_PUBLIC (decl
));
6809 /* We don't create any RTL for local variables. */
6810 if (DECL_FUNCTION_SCOPE_P (decl
) && !TREE_STATIC (decl
))
6813 /* We defer emission of local statics until the corresponding
6814 DECL_EXPR is expanded. But with constexpr its function might never
6815 be expanded, so go ahead and tell cgraph about the variable now. */
6816 defer_p
= ((DECL_FUNCTION_SCOPE_P (decl
)
6817 && !var_in_maybe_constexpr_fn (decl
))
6818 || DECL_VIRTUAL_P (decl
));
6820 /* Defer template instantiations. */
6821 if (DECL_LANG_SPECIFIC (decl
)
6822 && DECL_IMPLICIT_INSTANTIATION (decl
))
6825 /* If we're not deferring, go ahead and assemble the variable. */
6827 rest_of_decl_compilation (decl
, toplev
, at_eof
);
6830 /* walk_tree helper for wrap_temporary_cleanups, below. */
6833 wrap_cleanups_r (tree
*stmt_p
, int *walk_subtrees
, void *data
)
6835 /* Stop at types or full-expression boundaries. */
6836 if (TYPE_P (*stmt_p
)
6837 || TREE_CODE (*stmt_p
) == CLEANUP_POINT_EXPR
)
6843 if (TREE_CODE (*stmt_p
) == TARGET_EXPR
)
6845 tree guard
= (tree
)data
;
6846 tree tcleanup
= TARGET_EXPR_CLEANUP (*stmt_p
);
6848 tcleanup
= build2 (TRY_CATCH_EXPR
, void_type_node
, tcleanup
, guard
);
6849 /* Tell honor_protect_cleanup_actions to handle this as a separate
6851 TRY_CATCH_IS_CLEANUP (tcleanup
) = 1;
6853 TARGET_EXPR_CLEANUP (*stmt_p
) = tcleanup
;
6859 /* We're initializing a local variable which has a cleanup GUARD. If there
6860 are any temporaries used in the initializer INIT of this variable, we
6861 need to wrap their cleanups with TRY_CATCH_EXPR (, GUARD) so that the
6862 variable will be cleaned up properly if one of them throws.
6864 Unfortunately, there's no way to express this properly in terms of
6865 nesting, as the regions for the temporaries overlap the region for the
6866 variable itself; if there are two temporaries, the variable needs to be
6867 the first thing destroyed if either of them throws. However, we only
6868 want to run the variable's cleanup if it actually got constructed. So
6869 we need to guard the temporary cleanups with the variable's cleanup if
6870 they are run on the normal path, but not if they are run on the
6871 exceptional path. We implement this by telling
6872 honor_protect_cleanup_actions to strip the variable cleanup from the
6873 exceptional path. */
6876 wrap_temporary_cleanups (tree init
, tree guard
)
6878 cp_walk_tree_without_duplicates (&init
, wrap_cleanups_r
, (void *)guard
);
6881 /* Generate code to initialize DECL (a local variable). */
6884 initialize_local_var (tree decl
, tree init
)
6886 tree type
= TREE_TYPE (decl
);
6890 gcc_assert (VAR_P (decl
)
6891 || TREE_CODE (decl
) == RESULT_DECL
);
6892 gcc_assert (!TREE_STATIC (decl
));
6894 if (DECL_SIZE (decl
) == NULL_TREE
)
6896 /* If we used it already as memory, it must stay in memory. */
6897 DECL_INITIAL (decl
) = NULL_TREE
;
6898 TREE_ADDRESSABLE (decl
) = TREE_USED (decl
);
6902 if (type
== error_mark_node
)
6905 /* Compute and store the initial value. */
6906 already_used
= TREE_USED (decl
) || TREE_USED (type
);
6907 if (TREE_USED (type
))
6908 DECL_READ_P (decl
) = 1;
6910 /* Generate a cleanup, if necessary. */
6911 cleanup
= cxx_maybe_build_cleanup (decl
, tf_warning_or_error
);
6913 /* Perform the initialization. */
6916 tree rinit
= (TREE_CODE (init
) == INIT_EXPR
6917 ? TREE_OPERAND (init
, 1) : NULL_TREE
);
6918 if (rinit
&& !TREE_SIDE_EFFECTS (rinit
))
6920 /* Stick simple initializers in DECL_INITIAL so that
6921 -Wno-init-self works (c++/34772). */
6922 gcc_assert (TREE_OPERAND (init
, 0) == decl
);
6923 DECL_INITIAL (decl
) = rinit
;
6925 if (warn_init_self
&& TYPE_REF_P (type
))
6929 warning_at (DECL_SOURCE_LOCATION (decl
),
6931 "reference %qD is initialized with itself", decl
);
6936 int saved_stmts_are_full_exprs_p
;
6938 /* If we're only initializing a single object, guard the
6939 destructors of any temporaries used in its initializer with
6940 its destructor. This isn't right for arrays because each
6941 element initialization is a full-expression. */
6942 if (cleanup
&& TREE_CODE (type
) != ARRAY_TYPE
)
6943 wrap_temporary_cleanups (init
, cleanup
);
6945 gcc_assert (building_stmt_list_p ());
6946 saved_stmts_are_full_exprs_p
= stmts_are_full_exprs_p ();
6947 current_stmt_tree ()->stmts_are_full_exprs_p
= 1;
6948 finish_expr_stmt (init
);
6949 current_stmt_tree ()->stmts_are_full_exprs_p
=
6950 saved_stmts_are_full_exprs_p
;
6954 /* Set this to 0 so we can tell whether an aggregate which was
6955 initialized was ever used. Don't do this if it has a
6956 destructor, so we don't complain about the 'resource
6957 allocation is initialization' idiom. Now set
6958 attribute((unused)) on types so decls of that type will be
6959 marked used. (see TREE_USED, above.) */
6960 if (TYPE_NEEDS_CONSTRUCTING (type
)
6962 && TYPE_HAS_TRIVIAL_DESTRUCTOR (type
)
6963 && DECL_NAME (decl
))
6964 TREE_USED (decl
) = 0;
6965 else if (already_used
)
6966 TREE_USED (decl
) = 1;
6969 finish_decl_cleanup (decl
, cleanup
);
6972 /* DECL is a VAR_DECL for a compiler-generated variable with static
6973 storage duration (like a virtual table) whose initializer is a
6974 compile-time constant. Initialize the variable and provide it to the
6978 initialize_artificial_var (tree decl
, vec
<constructor_elt
, va_gc
> *v
)
6981 gcc_assert (DECL_ARTIFICIAL (decl
));
6982 init
= build_constructor (TREE_TYPE (decl
), v
);
6983 gcc_assert (TREE_CODE (init
) == CONSTRUCTOR
);
6984 DECL_INITIAL (decl
) = init
;
6985 DECL_INITIALIZED_P (decl
) = 1;
6986 /* Mark the decl as constexpr so that we can access its content
6988 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl
) = true;
6989 DECL_DECLARED_CONSTEXPR_P (decl
) = true;
6990 determine_visibility (decl
);
6991 layout_var_decl (decl
);
6992 maybe_commonize_var (decl
);
6993 make_rtl_for_nonlocal_decl (decl
, init
, /*asmspec=*/NULL
);
6996 /* INIT is the initializer for a variable, as represented by the
6997 parser. Returns true iff INIT is value-dependent. */
7000 value_dependent_init_p (tree init
)
7002 if (TREE_CODE (init
) == TREE_LIST
)
7003 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
7004 return any_value_dependent_elements_p (init
);
7005 else if (TREE_CODE (init
) == CONSTRUCTOR
)
7006 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
7008 if (dependent_type_p (TREE_TYPE (init
)))
7011 vec
<constructor_elt
, va_gc
> *elts
;
7015 elts
= CONSTRUCTOR_ELTS (init
);
7016 nelts
= vec_safe_length (elts
);
7017 for (i
= 0; i
< nelts
; ++i
)
7018 if (value_dependent_init_p ((*elts
)[i
].value
))
7022 /* It must be a simple expression, e.g., int i = 3; */
7023 return value_dependent_expression_p (init
);
7028 // Returns true if a DECL is VAR_DECL with the concept specifier.
7030 is_concept_var (tree decl
)
7032 return (VAR_P (decl
)
7033 // Not all variables have DECL_LANG_SPECIFIC.
7034 && DECL_LANG_SPECIFIC (decl
)
7035 && DECL_DECLARED_CONCEPT_P (decl
));
7038 /* A helper function to be called via walk_tree. If any label exists
7039 under *TP, it is (going to be) forced. Set has_forced_label_in_static. */
7042 notice_forced_label_r (tree
*tp
, int *walk_subtrees
, void *)
7046 if (TREE_CODE (*tp
) == LABEL_DECL
)
7047 cfun
->has_forced_label_in_static
= 1;
7051 /* Return true if DECL has either a trivial destructor, or for C++2A
7052 is constexpr and has a constexpr destructor. */
7055 decl_maybe_constant_destruction (tree decl
, tree type
)
7057 return (TYPE_HAS_TRIVIAL_DESTRUCTOR (type
)
7058 || (cxx_dialect
>= cxx2a
7060 && DECL_DECLARED_CONSTEXPR_P (decl
)
7061 && type_has_constexpr_destructor (strip_array_types (type
))));
7064 /* Finish processing of a declaration;
7065 install its line number and initial value.
7066 If the length of an array type is not known before,
7067 it must be determined now, from the initial value, or it is an error.
7069 INIT is the initializer (if any) for DECL. If INIT_CONST_EXPR_P is
7070 true, then INIT is an integral constant expression.
7072 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
7073 if the (init) syntax was used. */
7076 cp_finish_decl (tree decl
, tree init
, bool init_const_expr_p
,
7077 tree asmspec_tree
, int flags
)
7080 vec
<tree
, va_gc
> *cleanups
= NULL
;
7081 const char *asmspec
= NULL
;
7082 int was_readonly
= 0;
7083 bool var_definition_p
= false;
7086 if (decl
== error_mark_node
)
7091 error ("assignment (not initialization) in declaration");
7095 gcc_assert (TREE_CODE (decl
) != RESULT_DECL
);
7096 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
7097 gcc_assert (TREE_CODE (decl
) != PARM_DECL
);
7099 type
= TREE_TYPE (decl
);
7100 if (type
== error_mark_node
)
7103 /* Warn about register storage specifiers except when in GNU global
7104 or local register variable extension. */
7105 if (VAR_P (decl
) && DECL_REGISTER (decl
) && asmspec_tree
== NULL_TREE
)
7107 if (cxx_dialect
>= cxx17
)
7108 pedwarn (DECL_SOURCE_LOCATION (decl
), OPT_Wregister
,
7109 "ISO C++17 does not allow %<register%> storage "
7112 warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wregister
,
7113 "%<register%> storage class specifier used");
7116 /* If a name was specified, get the string. */
7117 if (at_namespace_scope_p ())
7118 asmspec_tree
= maybe_apply_renaming_pragma (decl
, asmspec_tree
);
7119 if (asmspec_tree
&& asmspec_tree
!= error_mark_node
)
7120 asmspec
= TREE_STRING_POINTER (asmspec_tree
);
7122 if (current_class_type
7123 && CP_DECL_CONTEXT (decl
) == current_class_type
7124 && TYPE_BEING_DEFINED (current_class_type
)
7125 && !CLASSTYPE_TEMPLATE_INSTANTIATION (current_class_type
)
7126 && (DECL_INITIAL (decl
) || init
))
7127 DECL_INITIALIZED_IN_CLASS_P (decl
) = 1;
7129 /* Do auto deduction unless decl is a function or an uninstantiated
7130 template specialization. */
7131 if (TREE_CODE (decl
) != FUNCTION_DECL
7132 && !(init
== NULL_TREE
7133 && DECL_LANG_SPECIFIC (decl
)
7134 && DECL_TEMPLATE_INSTANTIATION (decl
)
7135 && !DECL_TEMPLATE_INSTANTIATED (decl
))
7136 && (auto_node
= type_uses_auto (type
)))
7139 if (init
== NULL_TREE
)
7140 gcc_assert (CLASS_PLACEHOLDER_TEMPLATE (auto_node
));
7144 if (TREE_CODE (d_init
) == TREE_LIST
7145 && !CLASS_PLACEHOLDER_TEMPLATE (auto_node
))
7146 d_init
= build_x_compound_expr_from_list (d_init
, ELK_INIT
,
7147 tf_warning_or_error
);
7148 d_init
= resolve_nondeduced_context (d_init
, tf_warning_or_error
);
7150 enum auto_deduction_context adc
= adc_variable_type
;
7151 if (VAR_P (decl
) && DECL_DECOMPOSITION_P (decl
))
7152 adc
= adc_decomp_type
;
7153 type
= TREE_TYPE (decl
) = do_auto_deduction (type
, d_init
, auto_node
,
7154 tf_warning_or_error
, adc
,
7156 if (type
== error_mark_node
)
7158 if (TREE_CODE (type
) == FUNCTION_TYPE
)
7160 error ("initializer for %<decltype(auto) %D%> has function type; "
7161 "did you forget the %<()%>?", decl
);
7162 TREE_TYPE (decl
) = error_mark_node
;
7165 cp_apply_type_quals_to_decl (cp_type_quals (type
), decl
);
7168 if (ensure_literal_type_for_constexpr_object (decl
) == error_mark_node
)
7170 DECL_DECLARED_CONSTEXPR_P (decl
) = 0;
7171 if (VAR_P (decl
) && DECL_CLASS_SCOPE_P (decl
))
7174 DECL_EXTERNAL (decl
) = 1;
7179 && DECL_CLASS_SCOPE_P (decl
)
7180 && DECL_INITIALIZED_IN_CLASS_P (decl
))
7181 check_static_variable_definition (decl
, type
);
7183 if (init
&& TREE_CODE (decl
) == FUNCTION_DECL
)
7186 if (init
== ridpointers
[(int)RID_DELETE
])
7188 /* FIXME check this is 1st decl. */
7189 DECL_DELETED_FN (decl
) = 1;
7190 DECL_DECLARED_INLINE_P (decl
) = 1;
7191 DECL_INITIAL (decl
) = error_mark_node
;
7192 FOR_EACH_CLONE (clone
, decl
)
7194 DECL_DELETED_FN (clone
) = 1;
7195 DECL_DECLARED_INLINE_P (clone
) = 1;
7196 DECL_INITIAL (clone
) = error_mark_node
;
7200 else if (init
== ridpointers
[(int)RID_DEFAULT
])
7202 if (defaultable_fn_check (decl
))
7203 DECL_DEFAULTED_FN (decl
) = 1;
7205 DECL_INITIAL (decl
) = NULL_TREE
;
7209 if (init
&& VAR_P (decl
))
7211 DECL_NONTRIVIALLY_INITIALIZED_P (decl
) = 1;
7212 /* If DECL is a reference, then we want to know whether init is a
7213 reference constant; init_const_expr_p as passed tells us whether
7214 it's an rvalue constant. */
7215 if (TYPE_REF_P (type
))
7216 init_const_expr_p
= potential_constant_expression (init
);
7217 if (init_const_expr_p
)
7219 /* Set these flags now for templates. We'll update the flags in
7220 store_init_value for instantiations. */
7221 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl
) = 1;
7222 if (decl_maybe_constant_var_p (decl
)
7223 /* FIXME setting TREE_CONSTANT on refs breaks the back end. */
7224 && !TYPE_REF_P (type
))
7225 TREE_CONSTANT (decl
) = 1;
7229 if (processing_template_decl
)
7231 bool type_dependent_p
;
7233 /* Add this declaration to the statement-tree. */
7234 if (at_function_scope_p ())
7235 add_decl_expr (decl
);
7237 type_dependent_p
= dependent_type_p (type
);
7239 if (check_for_bare_parameter_packs (init
))
7242 DECL_INITIAL (decl
) = NULL_TREE
;
7245 /* Handle `constinit' on variable templates. */
7246 if (flags
& LOOKUP_CONSTINIT
)
7247 TINFO_VAR_DECLARED_CONSTINIT (DECL_TEMPLATE_INFO (decl
)) = true;
7249 /* Generally, initializers in templates are expanded when the
7250 template is instantiated. But, if DECL is a variable constant
7251 then it can be used in future constant expressions, so its value
7252 must be available. */
7254 bool dep_init
= false;
7256 if (!VAR_P (decl
) || type_dependent_p
)
7257 /* We can't do anything if the decl has dependent type. */;
7258 else if (!init
&& is_concept_var (decl
))
7260 error ("variable concept has no initializer");
7261 init
= boolean_true_node
;
7264 && init_const_expr_p
7265 && !TYPE_REF_P (type
)
7266 && decl_maybe_constant_var_p (decl
)
7267 && !(dep_init
= value_dependent_init_p (init
)))
7269 /* This variable seems to be a non-dependent constant, so process
7270 its initializer. If check_initializer returns non-null the
7271 initialization wasn't constant after all. */
7273 cleanups
= make_tree_vector ();
7274 init_code
= check_initializer (decl
, init
, flags
, &cleanups
);
7275 if (init_code
== NULL_TREE
)
7277 release_tree_vector (cleanups
);
7281 gcc_assert (!DECL_PRETTY_FUNCTION_P (decl
));
7282 /* Deduce array size even if the initializer is dependent. */
7283 maybe_deduce_size_from_array_init (decl
, init
);
7284 /* And complain about multiple initializers. */
7285 if (init
&& TREE_CODE (init
) == TREE_LIST
&& TREE_CHAIN (init
)
7286 && !MAYBE_CLASS_TYPE_P (type
))
7287 init
= build_x_compound_expr_from_list (init
, ELK_INIT
,
7288 tf_warning_or_error
);
7292 DECL_INITIAL (decl
) = init
;
7296 retrofit_lang_decl (decl
);
7297 SET_DECL_DEPENDENT_INIT_P (decl
, true);
7302 /* Just store non-static data member initializers for later. */
7303 if (init
&& TREE_CODE (decl
) == FIELD_DECL
)
7304 DECL_INITIAL (decl
) = init
;
7306 /* Take care of TYPE_DECLs up front. */
7307 if (TREE_CODE (decl
) == TYPE_DECL
)
7309 if (type
!= error_mark_node
7310 && MAYBE_CLASS_TYPE_P (type
) && DECL_NAME (decl
))
7312 if (TREE_TYPE (DECL_NAME (decl
)) && TREE_TYPE (decl
) != type
)
7313 warning (0, "shadowing previous type declaration of %q#D", decl
);
7314 set_identifier_type_value (DECL_NAME (decl
), decl
);
7317 /* If we have installed this as the canonical typedef for this
7318 type, and that type has not been defined yet, delay emitting
7319 the debug information for it, as we will emit it later. */
7320 if (TYPE_MAIN_DECL (TREE_TYPE (decl
)) == decl
7321 && !COMPLETE_TYPE_P (TREE_TYPE (decl
)))
7322 TYPE_DECL_SUPPRESS_DEBUG (decl
) = 1;
7324 rest_of_decl_compilation (decl
, DECL_FILE_SCOPE_P (decl
),
7329 /* A reference will be modified here, as it is initialized. */
7330 if (! DECL_EXTERNAL (decl
)
7331 && TREE_READONLY (decl
)
7332 && TYPE_REF_P (type
))
7335 TREE_READONLY (decl
) = 0;
7340 duration_kind dk
= decl_storage_duration (decl
);
7341 /* [dcl.constinit]/1 "The constinit specifier shall be applied
7342 only to a declaration of a variable with static or thread storage
7344 if ((flags
& LOOKUP_CONSTINIT
)
7345 && !(dk
== dk_thread
|| dk
== dk_static
))
7347 error_at (DECL_SOURCE_LOCATION (decl
),
7348 "%<constinit%> can only be applied to a variable with "
7349 "static or thread storage duration");
7353 /* If this is a local variable that will need a mangled name,
7354 register it now. We must do this before processing the
7355 initializer for the variable, since the initialization might
7356 require a guard variable, and since the mangled name of the
7357 guard variable will depend on the mangled name of this
7359 if (DECL_FUNCTION_SCOPE_P (decl
)
7360 && TREE_STATIC (decl
)
7361 && !DECL_ARTIFICIAL (decl
))
7363 /* The variable holding an anonymous union will have had its
7364 discriminator set in finish_anon_union, after which it's
7365 NAME will have been cleared. */
7366 if (DECL_NAME (decl
))
7367 determine_local_discriminator (decl
);
7368 /* Normally has_forced_label_in_static is set during GIMPLE
7369 lowering, but [cd]tors are never actually compiled directly.
7370 We need to set this early so we can deal with the label
7371 address extension. */
7372 if ((DECL_CONSTRUCTOR_P (current_function_decl
)
7373 || DECL_DESTRUCTOR_P (current_function_decl
))
7376 walk_tree (&init
, notice_forced_label_r
, NULL
, NULL
);
7377 add_local_decl (cfun
, decl
);
7379 /* And make sure it's in the symbol table for
7380 c_parse_final_cleanups to find. */
7381 varpool_node::get_create (decl
);
7384 /* Convert the initializer to the type of DECL, if we have not
7385 already initialized DECL. */
7386 if (!DECL_INITIALIZED_P (decl
)
7387 /* If !DECL_EXTERNAL then DECL is being defined. In the
7388 case of a static data member initialized inside the
7389 class-specifier, there can be an initializer even if DECL
7390 is *not* defined. */
7391 && (!DECL_EXTERNAL (decl
) || init
))
7393 cleanups
= make_tree_vector ();
7394 init
= check_initializer (decl
, init
, flags
, &cleanups
);
7400 The memory occupied by any object of static storage
7401 duration is zero-initialized at program startup before
7402 any other initialization takes place.
7404 We cannot create an appropriate initializer until after
7405 the type of DECL is finalized. If DECL_INITIAL is set,
7406 then the DECL is statically initialized, and any
7407 necessary zero-initialization has already been performed. */
7408 if (TREE_STATIC (decl
) && !DECL_INITIAL (decl
))
7409 DECL_INITIAL (decl
) = build_zero_init (TREE_TYPE (decl
),
7410 /*nelts=*/NULL_TREE
,
7411 /*static_storage_p=*/true);
7412 /* Remember that the initialization for this variable has
7414 DECL_INITIALIZED_P (decl
) = 1;
7415 /* This declaration is the definition of this variable,
7416 unless we are initializing a static data member within
7417 the class specifier. */
7418 if (!DECL_EXTERNAL (decl
))
7419 var_definition_p
= true;
7421 /* If the variable has an array type, lay out the type, even if
7422 there is no initializer. It is valid to index through the
7423 array, and we must get TYPE_ALIGN set correctly on the array
7425 else if (TREE_CODE (type
) == ARRAY_TYPE
)
7428 if (TREE_STATIC (decl
)
7429 && !at_function_scope_p ()
7430 && current_function_decl
== NULL
)
7431 /* So decl is a global variable or a static member of a
7432 non local class. Record the types it uses
7433 so that we can decide later to emit debug info for them. */
7434 record_types_used_by_current_var_decl (decl
);
7437 /* Add this declaration to the statement-tree. This needs to happen
7438 after the call to check_initializer so that the DECL_EXPR for a
7439 reference temp is added before the DECL_EXPR for the reference itself. */
7440 if (DECL_FUNCTION_SCOPE_P (decl
))
7442 /* If we're building a variable sized type, and we might be
7443 reachable other than via the top of the current binding
7444 level, then create a new BIND_EXPR so that we deallocate
7445 the object at the right time. */
7448 && !TREE_CONSTANT (DECL_SIZE (decl
))
7449 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list
))
7452 bind
= build3 (BIND_EXPR
, void_type_node
, NULL
, NULL
, NULL
);
7453 TREE_SIDE_EFFECTS (bind
) = 1;
7455 BIND_EXPR_BODY (bind
) = push_stmt_list ();
7457 add_decl_expr (decl
);
7460 /* Let the middle end know about variables and functions -- but not
7461 static data members in uninstantiated class templates. */
7462 if (VAR_OR_FUNCTION_DECL_P (decl
))
7466 layout_var_decl (decl
);
7467 maybe_commonize_var (decl
);
7470 /* This needs to happen after the linkage is set. */
7471 determine_visibility (decl
);
7473 if (var_definition_p
&& TREE_STATIC (decl
))
7475 /* If a TREE_READONLY variable needs initialization
7476 at runtime, it is no longer readonly and we need to
7477 avoid MEM_READONLY_P being set on RTL created for it. */
7480 if (TREE_READONLY (decl
))
7481 TREE_READONLY (decl
) = 0;
7484 else if (was_readonly
)
7485 TREE_READONLY (decl
) = 1;
7487 /* Likewise if it needs destruction. */
7488 if (!decl_maybe_constant_destruction (decl
, type
))
7489 TREE_READONLY (decl
) = 0;
7492 make_rtl_for_nonlocal_decl (decl
, init
, asmspec
);
7494 /* Check for abstractness of the type. Notice that there is no
7495 need to strip array types here since the check for those types
7496 is already done within create_array_type_for_decl. */
7497 abstract_virtuals_error (decl
, type
);
7499 if (TREE_TYPE (decl
) == error_mark_node
)
7500 /* No initialization required. */
7502 else if (TREE_CODE (decl
) == FUNCTION_DECL
)
7506 if (init
== ridpointers
[(int)RID_DEFAULT
])
7508 /* An out-of-class default definition is defined at
7509 the point where it is explicitly defaulted. */
7510 if (DECL_DELETED_FN (decl
))
7511 maybe_explain_implicit_delete (decl
);
7512 else if (DECL_INITIAL (decl
) == error_mark_node
)
7513 synthesize_method (decl
);
7516 error_at (cp_expr_loc_or_loc (init
,
7517 DECL_SOURCE_LOCATION (decl
)),
7518 "function %q#D is initialized like a variable",
7521 /* else no initialization required. */
7523 else if (DECL_EXTERNAL (decl
)
7524 && ! (DECL_LANG_SPECIFIC (decl
)
7525 && DECL_NOT_REALLY_EXTERN (decl
)))
7527 /* check_initializer will have done any constant initialization. */
7529 /* A variable definition. */
7530 else if (DECL_FUNCTION_SCOPE_P (decl
) && !TREE_STATIC (decl
))
7531 /* Initialize the local variable. */
7532 initialize_local_var (decl
, init
);
7534 /* If a variable is defined, and then a subsequent
7535 definition with external linkage is encountered, we will
7536 get here twice for the same variable. We want to avoid
7537 calling expand_static_init more than once. For variables
7538 that are not static data members, we can call
7539 expand_static_init only when we actually process the
7540 initializer. It is not legal to redeclare a static data
7541 member, so this issue does not arise in that case. */
7542 else if (var_definition_p
&& TREE_STATIC (decl
))
7543 expand_static_init (decl
, init
);
7546 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
7547 reference, insert it in the statement-tree now. */
7551 FOR_EACH_VEC_ELT (*cleanups
, i
, t
)
7552 push_cleanup (decl
, t
, false);
7553 release_tree_vector (cleanups
);
7557 TREE_READONLY (decl
) = 1;
7561 && lookup_attribute ("omp declare target implicit",
7562 DECL_ATTRIBUTES (decl
)))
7564 DECL_ATTRIBUTES (decl
)
7565 = remove_attribute ("omp declare target implicit",
7566 DECL_ATTRIBUTES (decl
));
7567 complete_type (TREE_TYPE (decl
));
7568 if (!cp_omp_mappable_type (TREE_TYPE (decl
)))
7570 error ("%q+D in declare target directive does not have mappable"
7572 cp_omp_emit_unmappable_type_notes (TREE_TYPE (decl
));
7574 else if (!lookup_attribute ("omp declare target",
7575 DECL_ATTRIBUTES (decl
))
7576 && !lookup_attribute ("omp declare target link",
7577 DECL_ATTRIBUTES (decl
)))
7578 DECL_ATTRIBUTES (decl
)
7579 = tree_cons (get_identifier ("omp declare target"),
7580 NULL_TREE
, DECL_ATTRIBUTES (decl
));
7583 invoke_plugin_callbacks (PLUGIN_FINISH_DECL
, decl
);
7586 /* For class TYPE return itself or some its bases that contain
7587 any direct non-static data members. Return error_mark_node if an
7588 error has been diagnosed. */
7591 find_decomp_class_base (location_t loc
, tree type
, tree ret
)
7593 bool member_seen
= false;
7594 for (tree field
= TYPE_FIELDS (type
); field
; field
= DECL_CHAIN (field
))
7595 if (TREE_CODE (field
) != FIELD_DECL
7596 || DECL_ARTIFICIAL (field
)
7597 || DECL_UNNAMED_BIT_FIELD (field
))
7601 else if (ANON_AGGR_TYPE_P (TREE_TYPE (field
)))
7603 if (TREE_CODE (TREE_TYPE (field
)) == RECORD_TYPE
)
7604 error_at (loc
, "cannot decompose class type %qT because it has an "
7605 "anonymous struct member", type
);
7607 error_at (loc
, "cannot decompose class type %qT because it has an "
7608 "anonymous union member", type
);
7609 inform (DECL_SOURCE_LOCATION (field
), "declared here");
7610 return error_mark_node
;
7612 else if (!accessible_p (type
, field
, true))
7614 error_at (loc
, "cannot decompose inaccessible member %qD of %qT",
7616 inform (DECL_SOURCE_LOCATION (field
),
7617 TREE_PRIVATE (field
)
7618 ? G_("declared private here")
7619 : G_("declared protected here"));
7620 return error_mark_node
;
7625 tree base_binfo
, binfo
;
7626 tree orig_ret
= ret
;
7630 for (binfo
= TYPE_BINFO (type
), i
= 0;
7631 BINFO_BASE_ITERATE (binfo
, i
, base_binfo
); i
++)
7633 tree t
= find_decomp_class_base (loc
, TREE_TYPE (base_binfo
), ret
);
7634 if (t
== error_mark_node
)
7635 return error_mark_node
;
7636 if (t
!= NULL_TREE
&& t
!= ret
)
7640 error_at (loc
, "cannot decompose class type %qT: both it and "
7641 "its base class %qT have non-static data members",
7643 return error_mark_node
;
7645 else if (orig_ret
!= NULL_TREE
)
7647 else if (ret
!= NULL_TREE
)
7649 error_at (loc
, "cannot decompose class type %qT: its base "
7650 "classes %qT and %qT have non-static data "
7651 "members", type
, ret
, t
);
7652 return error_mark_node
;
7661 /* Return std::tuple_size<TYPE>::value. */
7664 get_tuple_size (tree type
)
7666 tree args
= make_tree_vec (1);
7667 TREE_VEC_ELT (args
, 0) = type
;
7668 tree inst
= lookup_template_class (tuple_size_identifier
, args
,
7669 /*in_decl*/NULL_TREE
,
7670 /*context*/std_node
,
7671 /*entering_scope*/false, tf_none
);
7672 inst
= complete_type (inst
);
7673 if (inst
== error_mark_node
|| !COMPLETE_TYPE_P (inst
))
7675 tree val
= lookup_qualified_name (inst
, value_identifier
,
7676 /*type*/false, /*complain*/false);
7677 if (TREE_CODE (val
) == VAR_DECL
|| TREE_CODE (val
) == CONST_DECL
)
7678 val
= maybe_constant_value (val
);
7679 if (TREE_CODE (val
) == INTEGER_CST
)
7682 return error_mark_node
;
7685 /* Return std::tuple_element<I,TYPE>::type. */
7688 get_tuple_element_type (tree type
, unsigned i
)
7690 tree args
= make_tree_vec (2);
7691 TREE_VEC_ELT (args
, 0) = build_int_cst (integer_type_node
, i
);
7692 TREE_VEC_ELT (args
, 1) = type
;
7693 tree inst
= lookup_template_class (tuple_element_identifier
, args
,
7694 /*in_decl*/NULL_TREE
,
7695 /*context*/std_node
,
7696 /*entering_scope*/false,
7697 tf_warning_or_error
);
7698 return make_typename_type (inst
, type_identifier
,
7699 none_type
, tf_warning_or_error
);
7702 /* Return e.get<i>() or get<i>(e). */
7705 get_tuple_decomp_init (tree decl
, unsigned i
)
7707 tree targs
= make_tree_vec (1);
7708 TREE_VEC_ELT (targs
, 0) = build_int_cst (integer_type_node
, i
);
7710 tree etype
= TREE_TYPE (decl
);
7711 tree e
= convert_from_reference (decl
);
7713 /* [The id-expression] e is an lvalue if the type of the entity e is an
7714 lvalue reference and an xvalue otherwise. */
7715 if (!TYPE_REF_P (etype
)
7716 || TYPE_REF_IS_RVALUE (etype
))
7719 tree fns
= lookup_qualified_name (TREE_TYPE (e
), get__identifier
,
7720 /*type*/false, /*complain*/false);
7721 bool use_member_get
= false;
7723 /* To use a member get, member lookup must find at least one
7724 declaration that is a function template
7725 whose first template parameter is a non-type parameter. */
7726 for (lkp_iterator
iter (MAYBE_BASELINK_FUNCTIONS (fns
)); iter
; ++iter
)
7729 if (TREE_CODE (fn
) == TEMPLATE_DECL
)
7731 tree tparms
= DECL_TEMPLATE_PARMS (fn
);
7732 tree parm
= TREE_VEC_ELT (INNERMOST_TEMPLATE_PARMS (tparms
), 0);
7733 if (TREE_CODE (TREE_VALUE (parm
)) == PARM_DECL
)
7735 use_member_get
= true;
7743 fns
= lookup_template_function (fns
, targs
);
7744 return build_new_method_call (e
, fns
, /*args*/NULL
,
7745 /*path*/NULL_TREE
, LOOKUP_NORMAL
,
7746 /*fn_p*/NULL
, tf_warning_or_error
);
7750 releasing_vec
args (make_tree_vector_single (e
));
7751 fns
= lookup_template_function (get__identifier
, targs
);
7752 fns
= perform_koenig_lookup (fns
, args
, tf_warning_or_error
);
7753 return finish_call_expr (fns
, &args
, /*novirt*/false,
7754 /*koenig*/true, tf_warning_or_error
);
7758 /* It's impossible to recover the decltype of a tuple decomposition variable
7759 based on the actual type of the variable, so store it in a hash table. */
7761 static GTY((cache
)) tree_cache_map
*decomp_type_table
;
7764 lookup_decomp_type (tree v
)
7766 return *decomp_type_table
->get (v
);
7769 /* Mangle a decomposition declaration if needed. Arguments like
7770 in cp_finish_decomp. */
7773 cp_maybe_mangle_decomp (tree decl
, tree first
, unsigned int count
)
7775 if (!processing_template_decl
7776 && !error_operand_p (decl
)
7777 && TREE_STATIC (decl
))
7779 auto_vec
<tree
, 16> v
;
7780 v
.safe_grow (count
);
7782 for (unsigned int i
= 0; i
< count
; i
++, d
= DECL_CHAIN (d
))
7783 v
[count
- i
- 1] = d
;
7784 SET_DECL_ASSEMBLER_NAME (decl
, mangle_decomp (decl
, v
));
7785 maybe_apply_pragma_weak (decl
);
7789 /* Finish a decomposition declaration. DECL is the underlying declaration
7790 "e", FIRST is the head of a chain of decls for the individual identifiers
7791 chained through DECL_CHAIN in reverse order and COUNT is the number of
7795 cp_finish_decomp (tree decl
, tree first
, unsigned int count
)
7797 if (error_operand_p (decl
))
7802 TREE_TYPE (first
) = error_mark_node
;
7803 if (DECL_HAS_VALUE_EXPR_P (first
))
7805 SET_DECL_VALUE_EXPR (first
, NULL_TREE
);
7806 DECL_HAS_VALUE_EXPR_P (first
) = 0;
7808 first
= DECL_CHAIN (first
);
7810 if (DECL_P (decl
) && DECL_NAMESPACE_SCOPE_P (decl
))
7811 SET_DECL_ASSEMBLER_NAME (decl
, get_identifier ("<decomp>"));
7815 location_t loc
= DECL_SOURCE_LOCATION (decl
);
7816 if (type_dependent_expression_p (decl
)
7817 /* This happens for range for when not in templates.
7818 Still add the DECL_VALUE_EXPRs for later processing. */
7819 || (!processing_template_decl
7820 && type_uses_auto (TREE_TYPE (decl
))))
7822 for (unsigned int i
= 0; i
< count
; i
++)
7824 if (!DECL_HAS_VALUE_EXPR_P (first
))
7826 tree v
= build_nt (ARRAY_REF
, decl
,
7827 size_int (count
- i
- 1),
7828 NULL_TREE
, NULL_TREE
);
7829 SET_DECL_VALUE_EXPR (first
, v
);
7830 DECL_HAS_VALUE_EXPR_P (first
) = 1;
7832 if (processing_template_decl
)
7833 fit_decomposition_lang_decl (first
, decl
);
7834 first
= DECL_CHAIN (first
);
7839 auto_vec
<tree
, 16> v
;
7840 v
.safe_grow (count
);
7842 for (unsigned int i
= 0; i
< count
; i
++, d
= DECL_CHAIN (d
))
7844 v
[count
- i
- 1] = d
;
7845 fit_decomposition_lang_decl (d
, decl
);
7848 tree type
= TREE_TYPE (decl
);
7851 if (TYPE_REF_P (type
))
7853 dexp
= convert_from_reference (dexp
);
7854 type
= complete_type (TREE_TYPE (type
));
7855 if (type
== error_mark_node
)
7857 if (!COMPLETE_TYPE_P (type
))
7859 error_at (loc
, "structured binding refers to incomplete type %qT",
7865 tree eltype
= NULL_TREE
;
7866 unsigned HOST_WIDE_INT eltscnt
= 0;
7867 if (TREE_CODE (type
) == ARRAY_TYPE
)
7870 nelts
= array_type_nelts_top (type
);
7871 if (nelts
== error_mark_node
)
7873 if (!tree_fits_uhwi_p (nelts
))
7875 error_at (loc
, "cannot decompose variable length array %qT", type
);
7878 eltscnt
= tree_to_uhwi (nelts
);
7879 if (count
!= eltscnt
)
7882 if (count
> eltscnt
)
7883 error_n (loc
, count
,
7884 "%u name provided for structured binding",
7885 "%u names provided for structured binding", count
);
7887 error_n (loc
, count
,
7888 "only %u name provided for structured binding",
7889 "only %u names provided for structured binding", count
);
7890 inform_n (loc
, eltscnt
,
7891 "while %qT decomposes into %wu element",
7892 "while %qT decomposes into %wu elements",
7896 eltype
= TREE_TYPE (type
);
7897 for (unsigned int i
= 0; i
< count
; i
++)
7899 TREE_TYPE (v
[i
]) = eltype
;
7900 layout_decl (v
[i
], 0);
7901 if (processing_template_decl
)
7903 tree t
= unshare_expr (dexp
);
7904 t
= build4_loc (DECL_SOURCE_LOCATION (v
[i
]), ARRAY_REF
,
7905 eltype
, t
, size_int (i
), NULL_TREE
,
7907 SET_DECL_VALUE_EXPR (v
[i
], t
);
7908 DECL_HAS_VALUE_EXPR_P (v
[i
]) = 1;
7911 /* 2 GNU extensions. */
7912 else if (TREE_CODE (type
) == COMPLEX_TYPE
)
7915 if (count
!= eltscnt
)
7917 eltype
= cp_build_qualified_type (TREE_TYPE (type
), TYPE_QUALS (type
));
7918 for (unsigned int i
= 0; i
< count
; i
++)
7920 TREE_TYPE (v
[i
]) = eltype
;
7921 layout_decl (v
[i
], 0);
7922 if (processing_template_decl
)
7924 tree t
= unshare_expr (dexp
);
7925 t
= build1_loc (DECL_SOURCE_LOCATION (v
[i
]),
7926 i
? IMAGPART_EXPR
: REALPART_EXPR
, eltype
,
7928 SET_DECL_VALUE_EXPR (v
[i
], t
);
7929 DECL_HAS_VALUE_EXPR_P (v
[i
]) = 1;
7932 else if (TREE_CODE (type
) == VECTOR_TYPE
)
7934 if (!TYPE_VECTOR_SUBPARTS (type
).is_constant (&eltscnt
))
7936 error_at (loc
, "cannot decompose variable length vector %qT", type
);
7939 if (count
!= eltscnt
)
7941 eltype
= cp_build_qualified_type (TREE_TYPE (type
), TYPE_QUALS (type
));
7942 for (unsigned int i
= 0; i
< count
; i
++)
7944 TREE_TYPE (v
[i
]) = eltype
;
7945 layout_decl (v
[i
], 0);
7946 if (processing_template_decl
)
7948 tree t
= unshare_expr (dexp
);
7949 convert_vector_to_array_for_subscript (DECL_SOURCE_LOCATION (v
[i
]),
7951 t
= build4_loc (DECL_SOURCE_LOCATION (v
[i
]), ARRAY_REF
,
7952 eltype
, t
, size_int (i
), NULL_TREE
,
7954 SET_DECL_VALUE_EXPR (v
[i
], t
);
7955 DECL_HAS_VALUE_EXPR_P (v
[i
]) = 1;
7958 else if (tree tsize
= get_tuple_size (type
))
7960 if (tsize
== error_mark_node
)
7962 error_at (loc
, "%<std::tuple_size<%T>::value%> is not an integral "
7963 "constant expression", type
);
7966 if (!tree_fits_uhwi_p (tsize
))
7968 error_n (loc
, count
,
7969 "%u name provided for structured binding",
7970 "%u names provided for structured binding", count
);
7971 inform (loc
, "while %qT decomposes into %E elements",
7975 eltscnt
= tree_to_uhwi (tsize
);
7976 if (count
!= eltscnt
)
7978 int save_read
= DECL_READ_P (decl
);
7979 for (unsigned i
= 0; i
< count
; ++i
)
7981 location_t sloc
= input_location
;
7982 location_t dloc
= DECL_SOURCE_LOCATION (v
[i
]);
7984 input_location
= dloc
;
7985 tree init
= get_tuple_decomp_init (decl
, i
);
7986 tree eltype
= (init
== error_mark_node
? error_mark_node
7987 : get_tuple_element_type (type
, i
));
7988 input_location
= sloc
;
7990 if (init
== error_mark_node
|| eltype
== error_mark_node
)
7992 inform (dloc
, "in initialization of structured binding "
7993 "variable %qD", v
[i
]);
7996 /* Save the decltype away before reference collapse. */
7997 hash_map_safe_put
<hm_ggc
> (decomp_type_table
, v
[i
], eltype
);
7998 eltype
= cp_build_reference_type (eltype
, !lvalue_p (init
));
7999 TREE_TYPE (v
[i
]) = eltype
;
8000 layout_decl (v
[i
], 0);
8001 if (DECL_HAS_VALUE_EXPR_P (v
[i
]))
8003 /* In this case the names are variables, not just proxies. */
8004 SET_DECL_VALUE_EXPR (v
[i
], NULL_TREE
);
8005 DECL_HAS_VALUE_EXPR_P (v
[i
]) = 0;
8007 if (!processing_template_decl
)
8009 TREE_PUBLIC (v
[i
]) = TREE_PUBLIC (decl
);
8010 TREE_STATIC (v
[i
]) = TREE_STATIC (decl
);
8011 DECL_COMMON (v
[i
]) = DECL_COMMON (decl
);
8012 DECL_COMDAT (v
[i
]) = DECL_COMDAT (decl
);
8013 if (TREE_STATIC (v
[i
]))
8015 CP_DECL_THREAD_LOCAL_P (v
[i
])
8016 = CP_DECL_THREAD_LOCAL_P (decl
);
8017 set_decl_tls_model (v
[i
], DECL_TLS_MODEL (decl
));
8018 if (DECL_ONE_ONLY (decl
))
8019 make_decl_one_only (v
[i
], cxx_comdat_group (v
[i
]));
8020 if (TREE_PUBLIC (decl
))
8021 DECL_WEAK (v
[i
]) = DECL_WEAK (decl
);
8022 DECL_VISIBILITY (v
[i
]) = DECL_VISIBILITY (decl
);
8023 DECL_VISIBILITY_SPECIFIED (v
[i
])
8024 = DECL_VISIBILITY_SPECIFIED (decl
);
8026 cp_finish_decl (v
[i
], init
, /*constexpr*/false,
8027 /*asm*/NULL_TREE
, LOOKUP_NORMAL
);
8030 /* Ignore reads from the underlying decl performed during initialization
8031 of the individual variables. If those will be read, we'll mark
8032 the underlying decl as read at that point. */
8033 DECL_READ_P (decl
) = save_read
;
8035 else if (TREE_CODE (type
) == UNION_TYPE
)
8037 error_at (loc
, "cannot decompose union type %qT", type
);
8040 else if (!CLASS_TYPE_P (type
))
8042 error_at (loc
, "cannot decompose non-array non-class type %qT", type
);
8045 else if (LAMBDA_TYPE_P (type
))
8047 error_at (loc
, "cannot decompose lambda closure type %qT", type
);
8050 else if (processing_template_decl
&& !COMPLETE_TYPE_P (type
))
8051 pedwarn (loc
, 0, "structured binding refers to incomplete class type %qT",
8055 tree btype
= find_decomp_class_base (loc
, type
, NULL_TREE
);
8056 if (btype
== error_mark_node
)
8058 else if (btype
== NULL_TREE
)
8060 error_at (loc
, "cannot decompose class type %qT without non-static "
8061 "data members", type
);
8064 for (tree field
= TYPE_FIELDS (btype
); field
; field
= TREE_CHAIN (field
))
8065 if (TREE_CODE (field
) != FIELD_DECL
8066 || DECL_ARTIFICIAL (field
)
8067 || DECL_UNNAMED_BIT_FIELD (field
))
8071 if (count
!= eltscnt
)
8076 t
= convert_to_base (t
, btype
, /*check_access*/true,
8077 /*nonnull*/false, tf_warning_or_error
);
8081 for (tree field
= TYPE_FIELDS (btype
); field
; field
= TREE_CHAIN (field
))
8082 if (TREE_CODE (field
) != FIELD_DECL
8083 || DECL_ARTIFICIAL (field
)
8084 || DECL_UNNAMED_BIT_FIELD (field
))
8088 tree tt
= finish_non_static_data_member (field
, unshare_expr (t
),
8090 if (REFERENCE_REF_P (tt
))
8091 tt
= TREE_OPERAND (tt
, 0);
8092 TREE_TYPE (v
[i
]) = TREE_TYPE (tt
);
8093 layout_decl (v
[i
], 0);
8094 if (!processing_template_decl
)
8096 SET_DECL_VALUE_EXPR (v
[i
], tt
);
8097 DECL_HAS_VALUE_EXPR_P (v
[i
]) = 1;
8102 if (processing_template_decl
)
8104 for (unsigned int i
= 0; i
< count
; i
++)
8105 if (!DECL_HAS_VALUE_EXPR_P (v
[i
]))
8107 tree a
= build_nt (ARRAY_REF
, decl
, size_int (i
),
8108 NULL_TREE
, NULL_TREE
);
8109 SET_DECL_VALUE_EXPR (v
[i
], a
);
8110 DECL_HAS_VALUE_EXPR_P (v
[i
]) = 1;
8115 /* Returns a declaration for a VAR_DECL as if:
8117 extern "C" TYPE NAME;
8119 had been seen. Used to create compiler-generated global
8123 declare_global_var (tree name
, tree type
)
8127 push_to_top_level ();
8128 decl
= build_decl (input_location
, VAR_DECL
, name
, type
);
8129 TREE_PUBLIC (decl
) = 1;
8130 DECL_EXTERNAL (decl
) = 1;
8131 DECL_ARTIFICIAL (decl
) = 1;
8132 DECL_CONTEXT (decl
) = FROB_CONTEXT (global_namespace
);
8133 /* If the user has explicitly declared this variable (perhaps
8134 because the code we are compiling is part of a low-level runtime
8135 library), then it is possible that our declaration will be merged
8136 with theirs by pushdecl. */
8137 decl
= pushdecl (decl
);
8138 cp_finish_decl (decl
, NULL_TREE
, false, NULL_TREE
, 0);
8139 pop_from_top_level ();
8144 /* Returns the type for the argument to "__cxa_atexit" (or "atexit",
8145 if "__cxa_atexit" is not being used) corresponding to the function
8146 to be called when the program exits. */
8149 get_atexit_fn_ptr_type (void)
8153 if (!atexit_fn_ptr_type_node
)
8156 if (flag_use_cxa_atexit
8157 && !targetm
.cxx
.use_atexit_for_cxa_atexit ())
8158 /* The parameter to "__cxa_atexit" is "void (*)(void *)". */
8159 arg_type
= ptr_type_node
;
8161 /* The parameter to "atexit" is "void (*)(void)". */
8162 arg_type
= NULL_TREE
;
8164 fn_type
= build_function_type_list (void_type_node
,
8165 arg_type
, NULL_TREE
);
8166 atexit_fn_ptr_type_node
= build_pointer_type (fn_type
);
8169 return atexit_fn_ptr_type_node
;
8172 /* Returns a pointer to the `atexit' function. Note that if
8173 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
8174 `__cxa_atexit' function specified in the IA64 C++ ABI. */
8177 get_atexit_node (void)
8183 bool use_aeabi_atexit
;
8188 if (flag_use_cxa_atexit
&& !targetm
.cxx
.use_atexit_for_cxa_atexit ())
8190 /* The declaration for `__cxa_atexit' is:
8192 int __cxa_atexit (void (*)(void *), void *, void *)
8194 We build up the argument types and then the function type
8196 tree argtype0
, argtype1
, argtype2
;
8198 use_aeabi_atexit
= targetm
.cxx
.use_aeabi_atexit ();
8199 /* First, build the pointer-to-function type for the first
8201 fn_ptr_type
= get_atexit_fn_ptr_type ();
8202 /* Then, build the rest of the argument types. */
8203 argtype2
= ptr_type_node
;
8204 if (use_aeabi_atexit
)
8206 argtype1
= fn_ptr_type
;
8207 argtype0
= ptr_type_node
;
8211 argtype1
= ptr_type_node
;
8212 argtype0
= fn_ptr_type
;
8214 /* And the final __cxa_atexit type. */
8215 fn_type
= build_function_type_list (integer_type_node
,
8216 argtype0
, argtype1
, argtype2
,
8218 if (use_aeabi_atexit
)
8219 name
= "__aeabi_atexit";
8221 name
= "__cxa_atexit";
8225 /* The declaration for `atexit' is:
8227 int atexit (void (*)());
8229 We build up the argument types and then the function type
8231 fn_ptr_type
= get_atexit_fn_ptr_type ();
8232 /* Build the final atexit type. */
8233 fn_type
= build_function_type_list (integer_type_node
,
8234 fn_ptr_type
, NULL_TREE
);
8238 /* Now, build the function declaration. */
8239 push_lang_context (lang_name_c
);
8240 atexit_fndecl
= build_library_fn_ptr (name
, fn_type
, ECF_LEAF
| ECF_NOTHROW
);
8241 mark_used (atexit_fndecl
);
8242 pop_lang_context ();
8243 atexit_node
= decay_conversion (atexit_fndecl
, tf_warning_or_error
);
8248 /* Like get_atexit_node, but for thread-local cleanups. */
8251 get_thread_atexit_node (void)
8253 /* The declaration for `__cxa_thread_atexit' is:
8255 int __cxa_thread_atexit (void (*)(void *), void *, void *) */
8256 tree fn_type
= build_function_type_list (integer_type_node
,
8257 get_atexit_fn_ptr_type (),
8258 ptr_type_node
, ptr_type_node
,
8261 /* Now, build the function declaration. */
8262 tree atexit_fndecl
= build_library_fn_ptr ("__cxa_thread_atexit", fn_type
,
8263 ECF_LEAF
| ECF_NOTHROW
);
8264 return decay_conversion (atexit_fndecl
, tf_warning_or_error
);
8267 /* Returns the __dso_handle VAR_DECL. */
8270 get_dso_handle_node (void)
8272 if (dso_handle_node
)
8273 return dso_handle_node
;
8275 /* Declare the variable. */
8276 dso_handle_node
= declare_global_var (get_identifier ("__dso_handle"),
8279 #ifdef HAVE_GAS_HIDDEN
8280 if (dso_handle_node
!= error_mark_node
)
8282 DECL_VISIBILITY (dso_handle_node
) = VISIBILITY_HIDDEN
;
8283 DECL_VISIBILITY_SPECIFIED (dso_handle_node
) = 1;
8287 return dso_handle_node
;
8290 /* Begin a new function with internal linkage whose job will be simply
8291 to destroy some particular variable. */
8293 static GTY(()) int start_cleanup_cnt
;
8296 start_cleanup_fn (void)
8301 bool use_cxa_atexit
= flag_use_cxa_atexit
8302 && !targetm
.cxx
.use_atexit_for_cxa_atexit ();
8304 push_to_top_level ();
8306 /* No need to mangle this. */
8307 push_lang_context (lang_name_c
);
8309 /* Build the name of the function. */
8310 sprintf (name
, "__tcf_%d", start_cleanup_cnt
++);
8311 /* Build the function declaration. */
8312 fntype
= TREE_TYPE (get_atexit_fn_ptr_type ());
8313 fndecl
= build_lang_decl (FUNCTION_DECL
, get_identifier (name
), fntype
);
8314 /* It's a function with internal linkage, generated by the
8316 TREE_PUBLIC (fndecl
) = 0;
8317 DECL_ARTIFICIAL (fndecl
) = 1;
8318 /* Make the function `inline' so that it is only emitted if it is
8319 actually needed. It is unlikely that it will be inlined, since
8320 it is only called via a function pointer, but we avoid unnecessary
8321 emissions this way. */
8322 DECL_DECLARED_INLINE_P (fndecl
) = 1;
8323 DECL_INTERFACE_KNOWN (fndecl
) = 1;
8324 /* Build the parameter. */
8327 tree parmdecl
= cp_build_parm_decl (fndecl
, NULL_TREE
, ptr_type_node
);
8328 TREE_USED (parmdecl
) = 1;
8329 DECL_READ_P (parmdecl
) = 1;
8330 DECL_ARGUMENTS (fndecl
) = parmdecl
;
8334 start_preparsed_function (fndecl
, NULL_TREE
, SF_PRE_PARSED
);
8336 pop_lang_context ();
8338 return current_function_decl
;
8341 /* Finish the cleanup function begun by start_cleanup_fn. */
8344 end_cleanup_fn (void)
8346 expand_or_defer_fn (finish_function (/*inline_p=*/false));
8348 pop_from_top_level ();
8351 /* Generate code to handle the destruction of DECL, an object with
8352 static storage duration. */
8355 register_dtor_fn (tree decl
)
8362 bool ob_parm
, dso_parm
, use_dtor
;
8363 tree arg0
, arg1
, arg2
;
8366 type
= TREE_TYPE (decl
);
8367 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type
))
8370 if (decl_maybe_constant_destruction (decl
, type
)
8371 && DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl
))
8373 cxx_maybe_build_cleanup (decl
, tf_warning_or_error
);
8377 /* If we're using "__cxa_atexit" (or "__cxa_thread_atexit" or
8378 "__aeabi_atexit"), and DECL is a class object, we can just pass the
8379 destructor to "__cxa_atexit"; we don't have to build a temporary
8380 function to do the cleanup. */
8381 dso_parm
= (flag_use_cxa_atexit
8382 && !targetm
.cxx
.use_atexit_for_cxa_atexit ());
8383 ob_parm
= (CP_DECL_THREAD_LOCAL_P (decl
) || dso_parm
);
8384 use_dtor
= ob_parm
&& CLASS_TYPE_P (type
);
8387 cleanup
= get_class_binding (type
, complete_dtor_identifier
);
8389 /* Make sure it is accessible. */
8390 perform_or_defer_access_check (TYPE_BINFO (type
), cleanup
, cleanup
,
8391 tf_warning_or_error
);
8395 /* Call build_cleanup before we enter the anonymous function so
8396 that any access checks will be done relative to the current
8397 scope, rather than the scope of the anonymous function. */
8398 build_cleanup (decl
);
8400 /* Now start the function. */
8401 cleanup
= start_cleanup_fn ();
8403 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
8404 to the original function, rather than the anonymous one. That
8405 will make the back end think that nested functions are in use,
8406 which causes confusion. */
8407 push_deferring_access_checks (dk_no_check
);
8408 fcall
= build_cleanup (decl
);
8409 pop_deferring_access_checks ();
8411 /* Create the body of the anonymous function. */
8412 compound_stmt
= begin_compound_stmt (BCS_FN_BODY
);
8413 finish_expr_stmt (fcall
);
8414 finish_compound_stmt (compound_stmt
);
8418 /* Call atexit with the cleanup function. */
8419 mark_used (cleanup
);
8420 cleanup
= build_address (cleanup
);
8422 if (CP_DECL_THREAD_LOCAL_P (decl
))
8423 atex_node
= get_thread_atexit_node ();
8425 atex_node
= get_atexit_node ();
8429 /* We must convert CLEANUP to the type that "__cxa_atexit"
8431 cleanup
= build_nop (get_atexit_fn_ptr_type (), cleanup
);
8432 /* "__cxa_atexit" will pass the address of DECL to the
8433 cleanup function. */
8435 addr
= build_address (decl
);
8436 /* The declared type of the parameter to "__cxa_atexit" is
8437 "void *". For plain "T*", we could just let the
8438 machinery in cp_build_function_call convert it -- but if the
8439 type is "cv-qualified T *", then we need to convert it
8440 before passing it in, to avoid spurious errors. */
8441 addr
= build_nop (ptr_type_node
, addr
);
8444 /* Since the cleanup functions we build ignore the address
8445 they're given, there's no reason to pass the actual address
8446 in, and, in general, it's cheaper to pass NULL than any
8448 addr
= null_pointer_node
;
8451 arg2
= cp_build_addr_expr (get_dso_handle_node (),
8452 tf_warning_or_error
);
8454 /* Just pass NULL to the dso handle parm if we don't actually
8455 have a DSO handle on this target. */
8456 arg2
= null_pointer_node
;
8462 if (!CP_DECL_THREAD_LOCAL_P (decl
)
8463 && targetm
.cxx
.use_aeabi_atexit ())
8479 return cp_build_function_call_nary (atex_node
, tf_warning_or_error
,
8480 arg0
, arg1
, arg2
, NULL_TREE
);
8483 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
8484 is its initializer. Generate code to handle the construction
8485 and destruction of DECL. */
8488 expand_static_init (tree decl
, tree init
)
8490 gcc_assert (VAR_P (decl
));
8491 gcc_assert (TREE_STATIC (decl
));
8493 /* Some variables require no dynamic initialization. */
8494 if (decl_maybe_constant_destruction (decl
, TREE_TYPE (decl
)))
8496 /* Make sure the destructor is callable. */
8497 cxx_maybe_build_cleanup (decl
, tf_warning_or_error
);
8502 if (CP_DECL_THREAD_LOCAL_P (decl
) && DECL_GNU_TLS_P (decl
)
8503 && !DECL_FUNCTION_SCOPE_P (decl
))
8505 location_t dloc
= DECL_SOURCE_LOCATION (decl
);
8507 error_at (dloc
, "non-local variable %qD declared %<__thread%> "
8508 "needs dynamic initialization", decl
);
8510 error_at (dloc
, "non-local variable %qD declared %<__thread%> "
8511 "has a non-trivial destructor", decl
);
8512 static bool informed
;
8515 inform (dloc
, "C++11 %<thread_local%> allows dynamic "
8516 "initialization and destruction");
8522 if (DECL_FUNCTION_SCOPE_P (decl
))
8524 /* Emit code to perform this initialization but once. */
8525 tree if_stmt
= NULL_TREE
, inner_if_stmt
= NULL_TREE
;
8526 tree then_clause
= NULL_TREE
, inner_then_clause
= NULL_TREE
;
8527 tree guard
, guard_addr
;
8529 /* We don't need thread-safety code for thread-local vars. */
8530 bool thread_guard
= (flag_threadsafe_statics
8531 && !CP_DECL_THREAD_LOCAL_P (decl
));
8533 /* Emit code to perform this initialization but once. This code
8536 static <type> guard;
8537 if (!__atomic_load (guard.first_byte)) {
8538 if (__cxa_guard_acquire (&guard)) {
8541 // Do initialization.
8542 flag = true; __cxa_guard_release (&guard);
8543 // Register variable for destruction at end of program.
8545 if (!flag) __cxa_guard_abort (&guard);
8550 Note that the `flag' variable is only set to 1 *after* the
8551 initialization is complete. This ensures that an exception,
8552 thrown during the construction, will cause the variable to
8553 reinitialized when we pass through this code again, as per:
8557 If the initialization exits by throwing an exception, the
8558 initialization is not complete, so it will be tried again
8559 the next time control enters the declaration.
8561 This process should be thread-safe, too; multiple threads
8562 should not be able to initialize the variable more than
8565 /* Create the guard variable. */
8566 guard
= get_guard (decl
);
8568 /* Begin the conditional initialization. */
8569 if_stmt
= begin_if_stmt ();
8571 finish_if_stmt_cond (get_guard_cond (guard
, thread_guard
), if_stmt
);
8572 then_clause
= begin_compound_stmt (BCS_NO_SCOPE
);
8576 tree vfntype
= NULL_TREE
;
8577 tree acquire_name
, release_name
, abort_name
;
8578 tree acquire_fn
, release_fn
, abort_fn
;
8579 guard_addr
= build_address (guard
);
8581 acquire_name
= get_identifier ("__cxa_guard_acquire");
8582 release_name
= get_identifier ("__cxa_guard_release");
8583 abort_name
= get_identifier ("__cxa_guard_abort");
8584 acquire_fn
= get_global_binding (acquire_name
);
8585 release_fn
= get_global_binding (release_name
);
8586 abort_fn
= get_global_binding (abort_name
);
8588 acquire_fn
= push_library_fn
8589 (acquire_name
, build_function_type_list (integer_type_node
,
8590 TREE_TYPE (guard_addr
),
8592 NULL_TREE
, ECF_NOTHROW
| ECF_LEAF
);
8593 if (!release_fn
|| !abort_fn
)
8594 vfntype
= build_function_type_list (void_type_node
,
8595 TREE_TYPE (guard_addr
),
8598 release_fn
= push_library_fn (release_name
, vfntype
, NULL_TREE
,
8599 ECF_NOTHROW
| ECF_LEAF
);
8601 abort_fn
= push_library_fn (abort_name
, vfntype
, NULL_TREE
,
8602 ECF_NOTHROW
| ECF_LEAF
);
8604 inner_if_stmt
= begin_if_stmt ();
8605 finish_if_stmt_cond (build_call_n (acquire_fn
, 1, guard_addr
),
8608 inner_then_clause
= begin_compound_stmt (BCS_NO_SCOPE
);
8609 begin
= get_target_expr (boolean_false_node
);
8610 flag
= TARGET_EXPR_SLOT (begin
);
8612 TARGET_EXPR_CLEANUP (begin
)
8613 = build3 (COND_EXPR
, void_type_node
, flag
,
8615 build_call_n (abort_fn
, 1, guard_addr
));
8616 CLEANUP_EH_ONLY (begin
) = 1;
8618 /* Do the initialization itself. */
8619 init
= add_stmt_to_compound (begin
, init
);
8620 init
= add_stmt_to_compound
8621 (init
, build2 (MODIFY_EXPR
, void_type_node
, flag
, boolean_true_node
));
8622 init
= add_stmt_to_compound
8623 (init
, build_call_n (release_fn
, 1, guard_addr
));
8626 init
= add_stmt_to_compound (init
, set_guard (guard
));
8628 /* Use atexit to register a function for destroying this static
8630 init
= add_stmt_to_compound (init
, register_dtor_fn (decl
));
8632 finish_expr_stmt (init
);
8636 finish_compound_stmt (inner_then_clause
);
8637 finish_then_clause (inner_if_stmt
);
8638 finish_if_stmt (inner_if_stmt
);
8641 finish_compound_stmt (then_clause
);
8642 finish_then_clause (if_stmt
);
8643 finish_if_stmt (if_stmt
);
8645 else if (CP_DECL_THREAD_LOCAL_P (decl
))
8646 tls_aggregates
= tree_cons (init
, decl
, tls_aggregates
);
8648 static_aggregates
= tree_cons (init
, decl
, static_aggregates
);
8652 /* Make TYPE a complete type based on INITIAL_VALUE.
8653 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
8654 2 if there was no information (in which case assume 0 if DO_DEFAULT),
8655 3 if the initializer list is empty (in pedantic mode). */
8658 cp_complete_array_type (tree
*ptype
, tree initial_value
, bool do_default
)
8661 tree type
, elt_type
;
8663 /* Don't get confused by a CONSTRUCTOR for some other type. */
8664 if (initial_value
&& TREE_CODE (initial_value
) == CONSTRUCTOR
8665 && !BRACE_ENCLOSED_INITIALIZER_P (initial_value
)
8666 && TREE_CODE (TREE_TYPE (initial_value
)) != ARRAY_TYPE
)
8671 unsigned HOST_WIDE_INT i
;
8674 /* An array of character type can be initialized from a
8675 brace-enclosed string constant.
8677 FIXME: this code is duplicated from reshape_init. Probably
8678 we should just call reshape_init here? */
8679 if (char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (*ptype
)))
8680 && TREE_CODE (initial_value
) == CONSTRUCTOR
8681 && !vec_safe_is_empty (CONSTRUCTOR_ELTS (initial_value
)))
8683 vec
<constructor_elt
, va_gc
> *v
= CONSTRUCTOR_ELTS (initial_value
);
8684 tree value
= (*v
)[0].value
;
8685 STRIP_ANY_LOCATION_WRAPPER (value
);
8687 if (TREE_CODE (value
) == STRING_CST
8688 && v
->length () == 1)
8689 initial_value
= value
;
8692 /* If any of the elements are parameter packs, we can't actually
8693 complete this type now because the array size is dependent. */
8694 if (TREE_CODE (initial_value
) == CONSTRUCTOR
)
8696 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (initial_value
),
8699 if (PACK_EXPANSION_P (value
))
8705 failure
= complete_array_type (ptype
, initial_value
, do_default
);
8707 /* We can create the array before the element type is complete, which
8708 means that we didn't have these two bits set in the original type
8709 either. In completing the type, we are expected to propagate these
8710 bits. See also complete_type which does the same thing for arrays
8713 if (type
!= error_mark_node
&& TYPE_DOMAIN (type
))
8715 elt_type
= TREE_TYPE (type
);
8716 TYPE_NEEDS_CONSTRUCTING (type
) = TYPE_NEEDS_CONSTRUCTING (elt_type
);
8717 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type
)
8718 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (elt_type
);
8724 /* As above, but either give an error or reject zero-size arrays, depending
8728 cp_complete_array_type_or_error (tree
*ptype
, tree initial_value
,
8729 bool do_default
, tsubst_flags_t complain
)
8732 bool sfinae
= !(complain
& tf_error
);
8733 /* In SFINAE context we can't be lenient about zero-size arrays. */
8736 failure
= cp_complete_array_type (ptype
, initial_value
, do_default
);
8742 /* Not an error. */;
8743 else if (failure
== 1)
8744 error ("initializer fails to determine size of %qT", *ptype
);
8745 else if (failure
== 2)
8748 error ("array size missing in %qT", *ptype
);
8750 else if (failure
== 3)
8751 error ("zero-size array %qT", *ptype
);
8752 *ptype
= error_mark_node
;
8757 /* Return zero if something is declared to be a member of type
8758 CTYPE when in the context of CUR_TYPE. STRING is the error
8759 message to print in that case. Otherwise, quietly return 1. */
8762 member_function_or_else (tree ctype
, tree cur_type
, enum overload_flags flags
)
8764 if (ctype
&& ctype
!= cur_type
)
8766 if (flags
== DTOR_FLAG
)
8767 error ("destructor for alien class %qT cannot be a member", ctype
);
8769 error ("constructor for alien class %qT cannot be a member", ctype
);
8775 /* Subroutine of `grokdeclarator'. */
8777 /* Generate errors possibly applicable for a given set of specifiers.
8778 This is for ARM $7.1.2. */
8781 bad_specifiers (tree object
,
8782 enum bad_spec_place type
,
8788 const location_t
* locations
)
8794 error_at (locations
[ds_virtual
],
8795 "%qD declared as a %<virtual%> variable", object
);
8797 error ("%<const%> and %<volatile%> function specifiers on "
8798 "%qD invalid in variable declaration", object
);
8802 error_at (locations
[ds_virtual
],
8803 "%qD declared as a %<virtual%> parameter", object
);
8805 error_at (locations
[ds_inline
],
8806 "%qD declared as an %<inline%> parameter", object
);
8808 error ("%<const%> and %<volatile%> function specifiers on "
8809 "%qD invalid in parameter declaration", object
);
8813 error_at (locations
[ds_virtual
],
8814 "%qD declared as a %<virtual%> type", object
);
8816 error_at (locations
[ds_inline
],
8817 "%qD declared as an %<inline%> type", object
);
8819 error ("%<const%> and %<volatile%> function specifiers on "
8820 "%qD invalid in type declaration", object
);
8824 error_at (locations
[ds_virtual
],
8825 "%qD declared as a %<virtual%> field", object
);
8827 error_at (locations
[ds_inline
],
8828 "%qD declared as an %<inline%> field", object
);
8830 error ("%<const%> and %<volatile%> function specifiers on "
8831 "%qD invalid in field declaration", object
);
8837 error ("%q+D declared as a friend", object
);
8839 && !flag_noexcept_type
8840 && (TREE_CODE (object
) == TYPE_DECL
8841 || (!TYPE_PTRFN_P (TREE_TYPE (object
))
8842 && !TYPE_REFFN_P (TREE_TYPE (object
))
8843 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (object
)))))
8844 error ("%q+D declared with an exception specification", object
);
8847 /* DECL is a member function or static data member and is presently
8848 being defined. Check that the definition is taking place in a
8852 check_class_member_definition_namespace (tree decl
)
8854 /* These checks only apply to member functions and static data
8856 gcc_assert (VAR_OR_FUNCTION_DECL_P (decl
));
8857 /* We check for problems with specializations in pt.c in
8858 check_specialization_namespace, where we can issue better
8860 if (processing_specialization
)
8862 /* We check this in check_explicit_instantiation_namespace. */
8863 if (processing_explicit_instantiation
)
8867 A member function definition that appears outside of the
8868 class definition shall appear in a namespace scope enclosing
8869 the class definition.
8873 The definition for a static data member shall appear in a
8874 namespace scope enclosing the member's class definition. */
8875 if (!is_ancestor (current_namespace
, DECL_CONTEXT (decl
)))
8876 permerror (input_location
, "definition of %qD is not in namespace enclosing %qT",
8877 decl
, DECL_CONTEXT (decl
));
8880 /* Build a PARM_DECL for the "this" parameter of FN. TYPE is the
8881 METHOD_TYPE for a non-static member function; QUALS are the
8882 cv-qualifiers that apply to the function. */
8885 build_this_parm (tree fn
, tree type
, cp_cv_quals quals
)
8890 cp_cv_quals this_quals
;
8892 if (CLASS_TYPE_P (type
))
8895 = cp_build_qualified_type (type
, quals
& ~TYPE_QUAL_RESTRICT
);
8896 this_type
= build_pointer_type (this_type
);
8899 this_type
= type_of_this_parm (type
);
8900 /* The `this' parameter is implicitly `const'; it cannot be
8902 this_quals
= (quals
& TYPE_QUAL_RESTRICT
) | TYPE_QUAL_CONST
;
8903 qual_type
= cp_build_qualified_type (this_type
, this_quals
);
8904 parm
= build_artificial_parm (fn
, this_identifier
, qual_type
);
8905 cp_apply_type_quals_to_decl (this_quals
, parm
);
8909 /* DECL is a static member function. Complain if it was declared
8910 with function-cv-quals. */
8913 check_static_quals (tree decl
, cp_cv_quals quals
)
8915 if (quals
!= TYPE_UNQUALIFIED
)
8916 error ("static member function %q#D declared with type qualifiers",
8920 // Check that FN takes no arguments and returns bool.
8922 check_concept_fn (tree fn
)
8924 // A constraint is nullary.
8925 if (DECL_ARGUMENTS (fn
))
8926 error_at (DECL_SOURCE_LOCATION (fn
),
8927 "concept %q#D declared with function parameters", fn
);
8929 // The declared return type of the concept shall be bool, and
8930 // it shall not be deduced from it definition.
8931 tree type
= TREE_TYPE (TREE_TYPE (fn
));
8933 error_at (DECL_SOURCE_LOCATION (fn
),
8934 "concept %q#D declared with a deduced return type", fn
);
8935 else if (type
!= boolean_type_node
)
8936 error_at (DECL_SOURCE_LOCATION (fn
),
8937 "concept %q#D with non-%<bool%> return type %qT", fn
, type
);
8940 /* Helper function. Replace the temporary this parameter injected
8941 during cp_finish_omp_declare_simd with the real this parameter. */
8944 declare_simd_adjust_this (tree
*tp
, int *walk_subtrees
, void *data
)
8946 tree this_parm
= (tree
) data
;
8947 if (TREE_CODE (*tp
) == PARM_DECL
8948 && DECL_NAME (*tp
) == this_identifier
8949 && *tp
!= this_parm
)
8951 else if (TYPE_P (*tp
))
8956 /* CTYPE is class type, or null if non-class.
8957 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
8959 DECLARATOR is the function's name.
8960 PARMS is a chain of PARM_DECLs for the function.
8961 VIRTUALP is truthvalue of whether the function is virtual or not.
8962 FLAGS are to be passed through to `grokclassfn'.
8963 QUALS are qualifiers indicating whether the function is `const'
8965 RAISES is a list of exceptions that this function can raise.
8966 CHECK is 1 if we must find this method in CTYPE, 0 if we should
8967 not look, and -1 if we should not call `grokclassfn' at all.
8969 SFK is the kind of special function (if any) for the new function.
8971 Returns `NULL_TREE' if something goes wrong, after issuing
8972 applicable error messages. */
8975 grokfndecl (tree ctype
,
8979 tree orig_declarator
,
8980 const cp_decl_specifier_seq
*declspecs
,
8983 enum overload_flags flags
,
8985 cp_ref_qualifier rqual
,
8992 special_function_kind sfk
,
8994 bool late_return_type_p
,
8998 location_t location
)
9001 int staticp
= ctype
&& TREE_CODE (type
) == FUNCTION_TYPE
;
9004 if (location
== UNKNOWN_LOCATION
)
9005 location
= input_location
;
9007 /* Was the concept specifier present? */
9008 bool concept_p
= inlinep
& 4;
9010 /* Concept declarations must have a corresponding definition. */
9011 if (concept_p
&& !funcdef_flag
)
9013 error_at (location
, "concept %qD has no definition", declarator
);
9017 type
= build_cp_fntype_variant (type
, rqual
, raises
, late_return_type_p
);
9019 decl
= build_lang_decl_loc (location
, FUNCTION_DECL
, declarator
, type
);
9021 /* Set the constraints on the declaration. */
9024 tree tmpl_reqs
= NULL_TREE
;
9025 if (processing_template_decl
> template_class_depth (ctype
))
9026 tmpl_reqs
= TEMPLATE_PARMS_CONSTRAINTS (current_template_parms
);
9027 tree ci
= build_constraints (tmpl_reqs
, decl_reqs
);
9028 if (concept_p
&& ci
)
9030 error_at (location
, "a function concept cannot be constrained");
9033 set_constraints (decl
, ci
);
9036 if (TREE_CODE (type
) == METHOD_TYPE
)
9038 tree parm
= build_this_parm (decl
, type
, quals
);
9039 DECL_CHAIN (parm
) = parms
;
9042 /* Allocate space to hold the vptr bit if needed. */
9043 SET_DECL_ALIGN (decl
, MINIMUM_METHOD_BOUNDARY
);
9046 DECL_ARGUMENTS (decl
) = parms
;
9047 for (t
= parms
; t
; t
= DECL_CHAIN (t
))
9048 DECL_CONTEXT (t
) = decl
;
9050 /* Propagate volatile out from type to decl. */
9051 if (TYPE_VOLATILE (type
))
9052 TREE_THIS_VOLATILE (decl
) = 1;
9054 /* Setup decl according to sfk. */
9057 case sfk_constructor
:
9058 case sfk_copy_constructor
:
9059 case sfk_move_constructor
:
9060 DECL_CXX_CONSTRUCTOR_P (decl
) = 1;
9061 DECL_NAME (decl
) = ctor_identifier
;
9063 case sfk_destructor
:
9064 DECL_CXX_DESTRUCTOR_P (decl
) = 1;
9065 DECL_NAME (decl
) = dtor_identifier
;
9071 if (friendp
&& TREE_CODE (orig_declarator
) == TEMPLATE_ID_EXPR
)
9075 "defining explicit specialization %qD in friend declaration",
9079 tree fns
= TREE_OPERAND (orig_declarator
, 0);
9080 tree args
= TREE_OPERAND (orig_declarator
, 1);
9082 if (PROCESSING_REAL_TEMPLATE_DECL_P ())
9084 /* Something like `template <class T> friend void f<T>()'. */
9086 "invalid use of template-id %qD in declaration "
9087 "of primary template",
9093 /* A friend declaration of the form friend void f<>(). Record
9094 the information in the TEMPLATE_ID_EXPR. */
9095 SET_DECL_IMPLICIT_INSTANTIATION (decl
);
9097 gcc_assert (identifier_p (fns
) || OVL_P (fns
));
9098 DECL_TEMPLATE_INFO (decl
) = build_template_info (fns
, args
);
9100 for (t
= TYPE_ARG_TYPES (TREE_TYPE (decl
)); t
; t
= TREE_CHAIN (t
))
9101 if (TREE_PURPOSE (t
)
9102 && TREE_CODE (TREE_PURPOSE (t
)) == DEFERRED_PARSE
)
9104 error_at (defparse_location (TREE_PURPOSE (t
)),
9105 "default arguments are not allowed in declaration "
9106 "of friend template specialization %qD",
9113 error_at (declspecs
->locations
[ds_inline
],
9114 "%<inline%> is not allowed in declaration of friend "
9115 "template specialization %qD",
9122 /* C++17 11.3.6/4: "If a friend declaration specifies a default argument
9123 expression, that declaration shall be a definition..." */
9124 if (friendp
&& !funcdef_flag
)
9126 for (tree t
= FUNCTION_FIRST_USER_PARMTYPE (decl
);
9127 t
&& t
!= void_list_node
; t
= TREE_CHAIN (t
))
9128 if (TREE_PURPOSE (t
))
9130 permerror (DECL_SOURCE_LOCATION (decl
),
9131 "friend declaration of %qD specifies default "
9132 "arguments and isn%'t a definition", decl
);
9137 /* If this decl has namespace scope, set that up. */
9139 set_decl_namespace (decl
, in_namespace
, friendp
);
9141 DECL_CONTEXT (decl
) = FROB_CONTEXT (current_decl_namespace ());
9143 /* `main' and builtins have implicit 'C' linkage. */
9144 if (ctype
== NULL_TREE
9145 && DECL_FILE_SCOPE_P (decl
)
9146 && current_lang_name
== lang_name_cplusplus
9147 && (MAIN_NAME_P (declarator
)
9148 || (IDENTIFIER_LENGTH (declarator
) > 10
9149 && IDENTIFIER_POINTER (declarator
)[0] == '_'
9150 && IDENTIFIER_POINTER (declarator
)[1] == '_'
9151 && strncmp (IDENTIFIER_POINTER (declarator
)+2,
9152 "builtin_", 8) == 0)
9153 || (targetcm
.cxx_implicit_extern_c
9154 && (targetcm
.cxx_implicit_extern_c
9155 (IDENTIFIER_POINTER (declarator
))))))
9156 SET_DECL_LANGUAGE (decl
, lang_c
);
9158 /* Should probably propagate const out from type to decl I bet (mrs). */
9161 DECL_STATIC_FUNCTION_P (decl
) = 1;
9162 DECL_CONTEXT (decl
) = ctype
;
9166 DECL_DELETED_FN (decl
) = 1;
9170 DECL_CONTEXT (decl
) = ctype
;
9172 check_class_member_definition_namespace (decl
);
9175 if (ctype
== NULL_TREE
&& DECL_MAIN_P (decl
))
9177 if (PROCESSING_REAL_TEMPLATE_DECL_P())
9178 error_at (location
, "cannot declare %<::main%> to be a template");
9180 error_at (declspecs
->locations
[ds_inline
],
9181 "cannot declare %<::main%> to be inline");
9183 error_at (declspecs
->locations
[ds_constexpr
],
9184 "cannot declare %<::main%> to be %<constexpr%>");
9186 error_at (location
, "cannot declare %<::main%> to be static");
9191 /* Members of anonymous types and local classes have no linkage; make
9192 them internal. If a typedef is made later, this will be changed. */
9193 if (ctype
&& (!TREE_PUBLIC (TYPE_MAIN_DECL (ctype
))
9194 || decl_function_context (TYPE_MAIN_DECL (ctype
))))
9197 if (publicp
&& cxx_dialect
== cxx98
)
9199 /* [basic.link]: A name with no linkage (notably, the name of a class
9200 or enumeration declared in a local scope) shall not be used to
9201 declare an entity with linkage.
9203 DR 757 relaxes this restriction for C++0x. */
9204 no_linkage_error (decl
);
9207 TREE_PUBLIC (decl
) = publicp
;
9210 DECL_INTERFACE_KNOWN (decl
) = 1;
9211 DECL_NOT_REALLY_EXTERN (decl
) = 1;
9214 /* If the declaration was declared inline, mark it as such. */
9217 DECL_DECLARED_INLINE_P (decl
) = 1;
9219 DECL_COMDAT (decl
) = 1;
9222 DECL_DECLARED_CONSTEXPR_P (decl
) = true;
9224 // If the concept declaration specifier was found, check
9225 // that the declaration satisfies the necessary requirements.
9228 DECL_DECLARED_CONCEPT_P (decl
) = true;
9229 check_concept_fn (decl
);
9232 DECL_EXTERNAL (decl
) = 1;
9233 if (TREE_CODE (type
) == FUNCTION_TYPE
)
9236 TREE_TYPE (decl
) = apply_memfn_quals (TREE_TYPE (decl
),
9243 ? G_("static member function %qD cannot have cv-qualifier")
9244 : G_("non-member function %qD cannot have cv-qualifier"),
9246 quals
= TYPE_UNQUALIFIED
;
9252 ? G_("static member function %qD cannot have ref-qualifier")
9253 : G_("non-member function %qD cannot have ref-qualifier"),
9255 rqual
= REF_QUAL_NONE
;
9259 if (deduction_guide_p (decl
))
9261 if (!DECL_NAMESPACE_SCOPE_P (decl
))
9263 error_at (location
, "deduction guide %qD must be declared at "
9264 "namespace scope", decl
);
9269 "deduction guide %qD must not have a function body", decl
);
9271 else if (IDENTIFIER_ANY_OP_P (DECL_NAME (decl
))
9272 && !grok_op_properties (decl
, /*complain=*/true))
9274 else if (UDLIT_OPER_P (DECL_NAME (decl
)))
9276 bool long_long_unsigned_p
;
9278 const char *suffix
= NULL
;
9279 /* [over.literal]/6: Literal operators shall not have C linkage. */
9280 if (DECL_LANGUAGE (decl
) == lang_c
)
9282 error_at (location
, "literal operator with C linkage");
9283 maybe_show_extern_c_location ();
9287 if (DECL_NAMESPACE_SCOPE_P (decl
))
9289 if (!check_literal_operator_args (decl
, &long_long_unsigned_p
,
9292 error_at (location
, "%qD has invalid argument list", decl
);
9296 suffix
= UDLIT_OP_SUFFIX (DECL_NAME (decl
));
9297 if (long_long_unsigned_p
)
9299 if (cpp_interpret_int_suffix (parse_in
, suffix
, strlen (suffix
)))
9300 warning_at (location
, 0, "integer suffix %qs"
9301 " shadowed by implementation", suffix
);
9303 else if (long_double_p
)
9305 if (cpp_interpret_float_suffix (parse_in
, suffix
, strlen (suffix
)))
9306 warning_at (location
, 0, "floating-point suffix %qs"
9307 " shadowed by implementation", suffix
);
9310 if (suffix
[0] != '_'
9311 && !current_function_decl
&& !(friendp
&& !funcdef_flag
))
9312 warning_at (location
, OPT_Wliteral_suffix
,
9313 "literal operator suffixes not preceded by %<_%>"
9314 " are reserved for future standardization");
9318 error_at (location
, "%qD must be a non-member function", decl
);
9324 /* Make the init_value nonzero so pushdecl knows this is not
9325 tentative. error_mark_node is replaced later with the BLOCK. */
9326 DECL_INITIAL (decl
) = error_mark_node
;
9328 if (TYPE_NOTHROW_P (type
) || nothrow_libfn_p (decl
))
9329 TREE_NOTHROW (decl
) = 1;
9331 if (flag_openmp
|| flag_openmp_simd
)
9333 /* Adjust "omp declare simd" attributes. */
9334 tree ods
= lookup_attribute ("omp declare simd", *attrlist
);
9338 for (attr
= ods
; attr
;
9339 attr
= lookup_attribute ("omp declare simd", TREE_CHAIN (attr
)))
9341 if (TREE_CODE (type
) == METHOD_TYPE
)
9342 walk_tree (&TREE_VALUE (attr
), declare_simd_adjust_this
,
9343 DECL_ARGUMENTS (decl
), NULL
);
9344 if (TREE_VALUE (attr
) != NULL_TREE
)
9346 tree cl
= TREE_VALUE (TREE_VALUE (attr
));
9347 cl
= c_omp_declare_simd_clauses_to_numbers
9348 (DECL_ARGUMENTS (decl
), cl
);
9350 TREE_VALUE (TREE_VALUE (attr
)) = cl
;
9352 TREE_VALUE (attr
) = NULL_TREE
;
9358 /* Caller will do the rest of this. */
9362 if (ctype
!= NULL_TREE
)
9363 grokclassfn (ctype
, decl
, flags
);
9366 if (cxx_dialect
>= cxx11
9367 && DECL_DESTRUCTOR_P (decl
)
9368 && !TYPE_BEING_DEFINED (DECL_CONTEXT (decl
))
9369 && !processing_template_decl
)
9370 deduce_noexcept_on_destructor (decl
);
9372 decl
= check_explicit_specialization (orig_declarator
, decl
,
9375 4 * (friendp
!= 0) +
9378 if (decl
== error_mark_node
)
9381 if (DECL_STATIC_FUNCTION_P (decl
))
9382 check_static_quals (decl
, quals
);
9386 cplus_decl_attributes (&decl
, *attrlist
, 0);
9387 *attrlist
= NULL_TREE
;
9390 /* Check main's type after attributes have been applied. */
9391 if (ctype
== NULL_TREE
&& DECL_MAIN_P (decl
))
9393 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl
)),
9396 tree oldtypeargs
= TYPE_ARG_TYPES (TREE_TYPE (decl
));
9398 error_at (declspecs
->locations
[ds_type_spec
],
9399 "%<::main%> must return %<int%>");
9400 newtype
= build_function_type (integer_type_node
, oldtypeargs
);
9401 TREE_TYPE (decl
) = newtype
;
9404 check_main_parameter_types (decl
);
9407 if (ctype
!= NULL_TREE
&& check
)
9409 tree old_decl
= check_classfn (ctype
, decl
,
9410 (processing_template_decl
9411 > template_class_depth (ctype
))
9412 ? current_template_parms
9415 if (old_decl
== error_mark_node
)
9423 if (TREE_CODE (old_decl
) == TEMPLATE_DECL
)
9424 /* Because grokfndecl is always supposed to return a
9425 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
9426 here. We depend on our callers to figure out that its
9427 really a template that's being returned. */
9428 old_decl
= DECL_TEMPLATE_RESULT (old_decl
);
9430 if (DECL_STATIC_FUNCTION_P (old_decl
)
9431 && TREE_CODE (TREE_TYPE (decl
)) == METHOD_TYPE
)
9433 /* Remove the `this' parm added by grokclassfn. */
9434 revert_static_member_fn (decl
);
9435 check_static_quals (decl
, quals
);
9437 if (DECL_ARTIFICIAL (old_decl
))
9439 error ("definition of implicitly-declared %qD", old_decl
);
9442 else if (DECL_DEFAULTED_FN (old_decl
))
9444 error ("definition of explicitly-defaulted %q+D", decl
);
9445 inform (DECL_SOURCE_LOCATION (old_decl
),
9446 "%q#D explicitly defaulted here", old_decl
);
9450 /* Since we've smashed OLD_DECL to its
9451 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
9452 if (TREE_CODE (decl
) == TEMPLATE_DECL
)
9453 decl
= DECL_TEMPLATE_RESULT (decl
);
9455 /* Attempt to merge the declarations. This can fail, in
9456 the case of some invalid specialization declarations. */
9457 pushed_scope
= push_scope (ctype
);
9458 ok
= duplicate_decls (decl
, old_decl
, friendp
);
9460 pop_scope (pushed_scope
);
9463 error ("no %q#D member function declared in class %qT",
9467 if (ok
== error_mark_node
)
9473 if (DECL_CONSTRUCTOR_P (decl
) && !grok_ctor_properties (ctype
, decl
))
9476 if (ctype
== NULL_TREE
|| check
)
9480 DECL_VIRTUAL_P (decl
) = 1;
9485 /* decl is a FUNCTION_DECL.
9486 specifiers are the parsed virt-specifiers.
9488 Set flags to reflect the virt-specifiers.
9493 set_virt_specifiers (tree decl
, cp_virt_specifiers specifiers
)
9495 if (decl
== NULL_TREE
)
9497 if (specifiers
& VIRT_SPEC_OVERRIDE
)
9498 DECL_OVERRIDE_P (decl
) = 1;
9499 if (specifiers
& VIRT_SPEC_FINAL
)
9500 DECL_FINAL_P (decl
) = 1;
9504 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
9505 the linkage that DECL will receive in the object file. */
9508 set_linkage_for_static_data_member (tree decl
)
9510 /* A static data member always has static storage duration and
9511 external linkage. Note that static data members are forbidden in
9512 local classes -- the only situation in which a class has
9513 non-external linkage. */
9514 TREE_PUBLIC (decl
) = 1;
9515 TREE_STATIC (decl
) = 1;
9516 /* For non-template classes, static data members are always put
9517 out in exactly those files where they are defined, just as
9518 with ordinary namespace-scope variables. */
9519 if (!processing_template_decl
)
9520 DECL_INTERFACE_KNOWN (decl
) = 1;
9523 /* Create a VAR_DECL named NAME with the indicated TYPE.
9525 If SCOPE is non-NULL, it is the class type or namespace containing
9526 the variable. If SCOPE is NULL, the variable should is created in
9527 the innermost enclosing scope. */
9530 grokvardecl (tree type
,
9532 tree orig_declarator
,
9533 const cp_decl_specifier_seq
*declspecs
,
9540 location_t location
)
9543 tree explicit_scope
;
9545 gcc_assert (!name
|| identifier_p (name
));
9547 bool constp
= (type_quals
& TYPE_QUAL_CONST
) != 0;
9548 bool volatilep
= (type_quals
& TYPE_QUAL_VOLATILE
) != 0;
9550 /* Compute the scope in which to place the variable, but remember
9551 whether or not that scope was explicitly specified by the user. */
9552 explicit_scope
= scope
;
9555 /* An explicit "extern" specifier indicates a namespace-scope
9557 if (declspecs
->storage_class
== sc_extern
)
9558 scope
= current_decl_namespace ();
9559 else if (!at_function_scope_p ())
9560 scope
= current_scope ();
9564 && (/* If the variable is a namespace-scope variable declared in a
9565 template, we need DECL_LANG_SPECIFIC. */
9566 (TREE_CODE (scope
) == NAMESPACE_DECL
&& processing_template_decl
)
9567 /* Similarly for namespace-scope variables with language linkage
9569 || (TREE_CODE (scope
) == NAMESPACE_DECL
9570 && current_lang_name
!= lang_name_cplusplus
)
9571 /* Similarly for static data members. */
9573 /* Similarly for explicit specializations. */
9575 && TREE_CODE (orig_declarator
) == TEMPLATE_ID_EXPR
)))
9576 decl
= build_lang_decl_loc (location
, VAR_DECL
, name
, type
);
9578 decl
= build_decl (location
, VAR_DECL
, name
, type
);
9580 if (explicit_scope
&& TREE_CODE (explicit_scope
) == NAMESPACE_DECL
)
9581 set_decl_namespace (decl
, explicit_scope
, 0);
9583 DECL_CONTEXT (decl
) = FROB_CONTEXT (scope
);
9585 if (declspecs
->storage_class
== sc_extern
)
9587 DECL_THIS_EXTERN (decl
) = 1;
9588 DECL_EXTERNAL (decl
) = !initialized
;
9591 if (DECL_CLASS_SCOPE_P (decl
))
9593 set_linkage_for_static_data_member (decl
);
9594 /* This function is only called with out-of-class definitions. */
9595 DECL_EXTERNAL (decl
) = 0;
9596 check_class_member_definition_namespace (decl
);
9598 /* At top level, either `static' or no s.c. makes a definition
9599 (perhaps tentative), and absence of `static' makes it public. */
9600 else if (toplevel_bindings_p ())
9602 TREE_PUBLIC (decl
) = (declspecs
->storage_class
!= sc_static
9603 && (DECL_THIS_EXTERN (decl
)
9607 TREE_STATIC (decl
) = ! DECL_EXTERNAL (decl
);
9609 /* Not at top level, only `static' makes a static definition. */
9612 TREE_STATIC (decl
) = declspecs
->storage_class
== sc_static
;
9613 TREE_PUBLIC (decl
) = DECL_EXTERNAL (decl
);
9616 if (decl_spec_seq_has_spec_p (declspecs
, ds_thread
))
9618 if (DECL_EXTERNAL (decl
) || TREE_STATIC (decl
))
9620 CP_DECL_THREAD_LOCAL_P (decl
) = true;
9621 if (!processing_template_decl
)
9622 set_decl_tls_model (decl
, decl_default_tls_model (decl
));
9624 if (declspecs
->gnu_thread_keyword_p
)
9625 SET_DECL_GNU_TLS_P (decl
);
9628 /* If the type of the decl has no linkage, make sure that we'll
9629 notice that in mark_used. */
9630 if (cxx_dialect
> cxx98
9631 && decl_linkage (decl
) != lk_none
9632 && DECL_LANG_SPECIFIC (decl
) == NULL
9633 && !DECL_EXTERN_C_P (decl
)
9634 && no_linkage_check (TREE_TYPE (decl
), /*relaxed_p=*/false))
9635 retrofit_lang_decl (decl
);
9637 if (TREE_PUBLIC (decl
))
9639 /* [basic.link]: A name with no linkage (notably, the name of a class
9640 or enumeration declared in a local scope) shall not be used to
9641 declare an entity with linkage.
9643 DR 757 relaxes this restriction for C++0x. */
9644 if (cxx_dialect
< cxx11
)
9645 no_linkage_error (decl
);
9648 DECL_INTERFACE_KNOWN (decl
) = 1;
9650 if (DECL_NAME (decl
)
9651 && MAIN_NAME_P (DECL_NAME (decl
))
9652 && scope
== global_namespace
)
9653 error_at (DECL_SOURCE_LOCATION (decl
),
9654 "cannot declare %<::main%> to be a global variable");
9656 /* Check that the variable can be safely declared as a concept.
9657 Note that this also forbids explicit specializations. */
9660 if (!processing_template_decl
)
9662 error_at (declspecs
->locations
[ds_concept
],
9663 "a non-template variable cannot be %<concept%>");
9667 DECL_DECLARED_CONCEPT_P (decl
) = true;
9668 if (!same_type_ignoring_top_level_qualifiers_p (type
, boolean_type_node
))
9669 error_at (declspecs
->locations
[ds_type_spec
],
9670 "concept must have type %<bool%>");
9671 if (TEMPLATE_PARMS_CONSTRAINTS (current_template_parms
))
9673 error_at (location
, "a variable concept cannot be constrained");
9674 TEMPLATE_PARMS_CONSTRAINTS (current_template_parms
) = NULL_TREE
;
9677 else if (flag_concepts
9678 && processing_template_decl
> template_class_depth (scope
))
9680 tree reqs
= TEMPLATE_PARMS_CONSTRAINTS (current_template_parms
);
9681 tree ci
= build_constraints (reqs
, NULL_TREE
);
9683 set_constraints (decl
, ci
);
9686 // Handle explicit specializations and instantiations of variable templates.
9687 if (orig_declarator
)
9688 decl
= check_explicit_specialization (orig_declarator
, decl
,
9689 template_count
, conceptp
* 8);
9691 return decl
!= error_mark_node
? decl
: NULL_TREE
;
9694 /* Create and return a canonical pointer to member function type, for
9695 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
9698 build_ptrmemfunc_type (tree type
)
9703 if (type
== error_mark_node
)
9706 /* Make sure that we always have the unqualified pointer-to-member
9708 if (cp_cv_quals quals
= cp_type_quals (type
))
9710 tree unqual
= build_ptrmemfunc_type (TYPE_MAIN_VARIANT (type
));
9711 return cp_build_qualified_type (unqual
, quals
);
9714 /* If a canonical type already exists for this type, use it. We use
9715 this method instead of type_hash_canon, because it only does a
9716 simple equality check on the list of field members. */
9718 t
= TYPE_PTRMEMFUNC_TYPE (type
);
9722 t
= make_node (RECORD_TYPE
);
9724 /* Let the front end know this is a pointer to member function. */
9725 TYPE_PTRMEMFUNC_FLAG (t
) = 1;
9727 field
= build_decl (input_location
, FIELD_DECL
, pfn_identifier
, type
);
9728 DECL_NONADDRESSABLE_P (field
) = 1;
9731 field
= build_decl (input_location
, FIELD_DECL
, delta_identifier
,
9733 DECL_NONADDRESSABLE_P (field
) = 1;
9734 DECL_CHAIN (field
) = fields
;
9737 finish_builtin_struct (t
, "__ptrmemfunc_type", fields
, ptr_type_node
);
9739 /* Zap out the name so that the back end will give us the debugging
9740 information for this anonymous RECORD_TYPE. */
9741 TYPE_NAME (t
) = NULL_TREE
;
9743 /* Cache this pointer-to-member type so that we can find it again
9745 TYPE_PTRMEMFUNC_TYPE (type
) = t
;
9747 if (TYPE_STRUCTURAL_EQUALITY_P (type
))
9748 SET_TYPE_STRUCTURAL_EQUALITY (t
);
9749 else if (TYPE_CANONICAL (type
) != type
)
9750 TYPE_CANONICAL (t
) = build_ptrmemfunc_type (TYPE_CANONICAL (type
));
9755 /* Create and return a pointer to data member type. */
9758 build_ptrmem_type (tree class_type
, tree member_type
)
9760 if (TREE_CODE (member_type
) == METHOD_TYPE
)
9762 cp_cv_quals quals
= type_memfn_quals (member_type
);
9763 cp_ref_qualifier rqual
= type_memfn_rqual (member_type
);
9764 member_type
= build_memfn_type (member_type
, class_type
, quals
, rqual
);
9765 return build_ptrmemfunc_type (build_pointer_type (member_type
));
9769 gcc_assert (TREE_CODE (member_type
) != FUNCTION_TYPE
);
9770 return build_offset_type (class_type
, member_type
);
9774 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
9775 Check to see that the definition is valid. Issue appropriate error
9779 check_static_variable_definition (tree decl
, tree type
)
9781 /* Avoid redundant diagnostics on out-of-class definitions. */
9782 if (!current_class_type
|| !TYPE_BEING_DEFINED (current_class_type
))
9784 /* Can't check yet if we don't know the type. */
9785 else if (dependent_type_p (type
))
9787 /* If DECL is declared constexpr, we'll do the appropriate checks
9788 in check_initializer. Similarly for inline static data members. */
9789 else if (DECL_P (decl
)
9790 && (DECL_DECLARED_CONSTEXPR_P (decl
)
9791 || undeduced_auto_decl (decl
)
9792 || DECL_VAR_DECLARED_INLINE_P (decl
)))
9794 else if (cxx_dialect
>= cxx11
&& !INTEGRAL_OR_ENUMERATION_TYPE_P (type
))
9796 if (!COMPLETE_TYPE_P (type
))
9797 error_at (DECL_SOURCE_LOCATION (decl
),
9798 "in-class initialization of static data member %q#D of "
9799 "incomplete type", decl
);
9800 else if (literal_type_p (type
))
9801 permerror (DECL_SOURCE_LOCATION (decl
),
9802 "%<constexpr%> needed for in-class initialization of "
9803 "static data member %q#D of non-integral type", decl
);
9805 error_at (DECL_SOURCE_LOCATION (decl
),
9806 "in-class initialization of static data member %q#D of "
9807 "non-literal type", decl
);
9809 /* Motion 10 at San Diego: If a static const integral data member is
9810 initialized with an integral constant expression, the initializer
9811 may appear either in the declaration (within the class), or in
9812 the definition, but not both. If it appears in the class, the
9813 member is a member constant. The file-scope definition is always
9815 else if (!ARITHMETIC_TYPE_P (type
) && TREE_CODE (type
) != ENUMERAL_TYPE
)
9816 error_at (DECL_SOURCE_LOCATION (decl
),
9817 "invalid in-class initialization of static data member "
9818 "of non-integral type %qT",
9820 else if (!CP_TYPE_CONST_P (type
))
9821 error_at (DECL_SOURCE_LOCATION (decl
),
9822 "ISO C++ forbids in-class initialization of non-const "
9823 "static member %qD",
9825 else if (!INTEGRAL_OR_ENUMERATION_TYPE_P (type
))
9826 pedwarn (DECL_SOURCE_LOCATION (decl
), OPT_Wpedantic
,
9827 "ISO C++ forbids initialization of member constant "
9828 "%qD of non-integral type %qT", decl
, type
);
9831 /* *expr_p is part of the TYPE_SIZE of a variably-sized array. If any
9832 SAVE_EXPRs in *expr_p wrap expressions with side-effects, break those
9833 expressions out into temporary variables so that walk_tree doesn't
9834 step into them (c++/15764). */
9837 stabilize_save_expr_r (tree
*expr_p
, int *walk_subtrees
, void *data
)
9839 hash_set
<tree
> *pset
= (hash_set
<tree
> *)data
;
9840 tree expr
= *expr_p
;
9841 if (TREE_CODE (expr
) == SAVE_EXPR
)
9843 tree op
= TREE_OPERAND (expr
, 0);
9844 cp_walk_tree (&op
, stabilize_save_expr_r
, data
, pset
);
9845 if (TREE_SIDE_EFFECTS (op
))
9846 TREE_OPERAND (expr
, 0) = get_temp_regvar (TREE_TYPE (op
), op
);
9849 else if (!EXPR_P (expr
) || !TREE_SIDE_EFFECTS (expr
))
9854 /* Entry point for the above. */
9857 stabilize_vla_size (tree size
)
9859 hash_set
<tree
> pset
;
9860 /* Break out any function calls into temporary variables. */
9861 cp_walk_tree (&size
, stabilize_save_expr_r
, &pset
, &pset
);
9864 /* Reduce a SIZEOF_EXPR to its value. */
9867 fold_sizeof_expr (tree t
)
9870 if (SIZEOF_EXPR_TYPE_P (t
))
9871 r
= cxx_sizeof_or_alignof_type (TREE_TYPE (TREE_OPERAND (t
, 0)),
9872 SIZEOF_EXPR
, false, false);
9873 else if (TYPE_P (TREE_OPERAND (t
, 0)))
9874 r
= cxx_sizeof_or_alignof_type (TREE_OPERAND (t
, 0), SIZEOF_EXPR
,
9877 r
= cxx_sizeof_or_alignof_expr (TREE_OPERAND (t
, 0), SIZEOF_EXPR
,
9879 if (r
== error_mark_node
)
9884 /* Given the SIZE (i.e., number of elements) in an array, compute
9885 an appropriate index type for the array. If non-NULL, NAME is
9886 the name of the entity being declared. */
9889 compute_array_index_type_loc (location_t name_loc
, tree name
, tree size
,
9890 tsubst_flags_t complain
)
9892 if (error_operand_p (size
))
9893 return error_mark_node
;
9895 /* The type of the index being computed. */
9898 /* The original numeric size as seen in the source code before
9899 conversion to size_t. */
9900 tree origsize
= size
;
9902 location_t loc
= cp_expr_loc_or_loc (size
, name
? name_loc
: input_location
);
9904 if (!type_dependent_expression_p (size
))
9906 origsize
= size
= mark_rvalue_use (size
);
9908 if (cxx_dialect
< cxx11
&& TREE_CODE (size
) == NOP_EXPR
9909 && TREE_SIDE_EFFECTS (size
))
9910 /* In C++98, we mark a non-constant array bound with a magic
9911 NOP_EXPR with TREE_SIDE_EFFECTS; don't fold in that case. */;
9914 size
= instantiate_non_dependent_expr_sfinae (size
, complain
);
9915 size
= build_converted_constant_expr (size_type_node
, size
, complain
);
9916 /* Pedantically a constant expression is required here and so
9917 __builtin_is_constant_evaluated () should fold to true if it
9918 is successfully folded into a constant. */
9919 size
= maybe_constant_value (size
, NULL_TREE
,
9920 /*manifestly_const_eval=*/true);
9922 if (!TREE_CONSTANT (size
))
9926 if (error_operand_p (size
))
9927 return error_mark_node
;
9929 /* The array bound must be an integer type. */
9930 tree type
= TREE_TYPE (size
);
9931 if (!INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type
))
9933 if (!(complain
& tf_error
))
9934 return error_mark_node
;
9936 error_at (loc
, "size of array %qD has non-integral type %qT",
9939 error_at (loc
, "size of array has non-integral type %qT", type
);
9940 size
= integer_one_node
;
9944 /* A type is dependent if it is...an array type constructed from any
9945 dependent type or whose size is specified by a constant expression
9946 that is value-dependent. */
9947 /* We can only call value_dependent_expression_p on integral constant
9948 expressions; treat non-constant expressions as dependent, too. */
9949 if (processing_template_decl
9950 && (type_dependent_expression_p (size
)
9951 || !TREE_CONSTANT (size
) || value_dependent_expression_p (size
)))
9953 /* We cannot do any checking for a SIZE that isn't known to be
9954 constant. Just build the index type and mark that it requires
9955 structural equality checks. */
9956 itype
= build_index_type (build_min (MINUS_EXPR
, sizetype
,
9957 size
, size_one_node
));
9958 TYPE_DEPENDENT_P (itype
) = 1;
9959 TYPE_DEPENDENT_P_VALID (itype
) = 1;
9960 SET_TYPE_STRUCTURAL_EQUALITY (itype
);
9964 if (TREE_CODE (size
) != INTEGER_CST
)
9966 tree folded
= cp_fully_fold (size
);
9967 if (TREE_CODE (folded
) == INTEGER_CST
)
9970 pedwarn (loc
, OPT_Wpedantic
, "size of array %qD is not an "
9971 "integral constant-expression", name
);
9973 pedwarn (loc
, OPT_Wpedantic
,
9974 "size of array is not an integral constant-expression");
9976 /* Use the folded result for VLAs, too; it will have resolved
9981 /* Normally, the array-bound will be a constant. */
9982 if (TREE_CODE (size
) == INTEGER_CST
)
9984 /* The size to use in diagnostics that reflects the constant
9985 size used in the source, rather than SIZE massaged above. */
9986 tree diagsize
= size
;
9988 /* If the original size before conversion to size_t was signed
9989 and negative, convert it to ssizetype to restore the sign. */
9990 if (!TYPE_UNSIGNED (TREE_TYPE (origsize
))
9991 && TREE_CODE (size
) == INTEGER_CST
9992 && tree_int_cst_sign_bit (size
))
9994 diagsize
= fold_convert (ssizetype
, size
);
9996 /* Clear the overflow bit that may have been set as a result
9997 of the conversion from the sizetype of the new size to
9999 TREE_OVERFLOW (diagsize
) = false;
10002 /* Verify that the array has a positive number of elements
10003 and issue the appropriate diagnostic if it doesn't. */
10004 if (!valid_array_size_p (loc
, diagsize
, name
, (complain
& tf_error
)))
10006 if (!(complain
& tf_error
))
10007 return error_mark_node
;
10008 size
= integer_one_node
;
10010 /* As an extension we allow zero-sized arrays. */
10011 else if (integer_zerop (size
))
10013 if (!(complain
& tf_error
))
10014 /* We must fail if performing argument deduction (as
10015 indicated by the state of complain), so that
10016 another substitution can be found. */
10017 return error_mark_node
;
10019 pedwarn (loc
, OPT_Wpedantic
,
10020 "ISO C++ forbids zero-size array %qD", name
);
10022 pedwarn (loc
, OPT_Wpedantic
,
10023 "ISO C++ forbids zero-size array");
10026 else if (TREE_CONSTANT (size
)
10027 /* We don't allow VLAs at non-function scopes, or during
10028 tentative template substitution. */
10029 || !at_function_scope_p ()
10030 || !(complain
& tf_error
))
10032 if (!(complain
& tf_error
))
10033 return error_mark_node
;
10034 /* `(int) &fn' is not a valid array bound. */
10037 "size of array %qD is not an integral constant-expression",
10040 error_at (loc
, "size of array is not an integral constant-expression");
10041 size
= integer_one_node
;
10043 else if (pedantic
&& warn_vla
!= 0)
10046 pedwarn (name_loc
, OPT_Wvla
,
10047 "ISO C++ forbids variable length array %qD", name
);
10049 pedwarn (input_location
, OPT_Wvla
,
10050 "ISO C++ forbids variable length array");
10052 else if (warn_vla
> 0)
10055 warning_at (name_loc
, OPT_Wvla
,
10056 "variable length array %qD is used", name
);
10059 "variable length array is used");
10062 if (processing_template_decl
&& !TREE_CONSTANT (size
))
10063 /* A variable sized array. */
10064 itype
= build_min (MINUS_EXPR
, sizetype
, size
, integer_one_node
);
10067 /* Compute the index of the largest element in the array. It is
10068 one less than the number of elements in the array. We save
10069 and restore PROCESSING_TEMPLATE_DECL so that computations in
10070 cp_build_binary_op will be appropriately folded. */
10072 processing_template_decl_sentinel s
;
10073 itype
= cp_build_binary_op (input_location
,
10075 cp_convert (ssizetype
, size
, complain
),
10076 cp_convert (ssizetype
, integer_one_node
,
10079 itype
= maybe_constant_value (itype
);
10082 if (!TREE_CONSTANT (itype
))
10084 /* A variable sized array. */
10085 itype
= variable_size (itype
);
10087 stabilize_vla_size (itype
);
10089 if (sanitize_flags_p (SANITIZE_VLA
)
10090 && current_function_decl
!= NULL_TREE
)
10092 /* We have to add 1 -- in the ubsan routine we generate
10093 LE_EXPR rather than LT_EXPR. */
10094 tree t
= fold_build2 (PLUS_EXPR
, TREE_TYPE (itype
), itype
,
10095 build_one_cst (TREE_TYPE (itype
)));
10096 t
= ubsan_instrument_vla (input_location
, t
);
10097 finish_expr_stmt (t
);
10100 /* Make sure that there was no overflow when creating to a signed
10101 index type. (For example, on a 32-bit machine, an array with
10102 size 2^32 - 1 is too big.) */
10103 else if (TREE_CODE (itype
) == INTEGER_CST
10104 && TREE_OVERFLOW (itype
))
10106 if (!(complain
& tf_error
))
10107 return error_mark_node
;
10108 error ("overflow in array dimension");
10109 TREE_OVERFLOW (itype
) = 0;
10113 /* Create and return the appropriate index type. */
10114 itype
= build_index_type (itype
);
10116 /* If the index type were dependent, we would have returned early, so
10117 remember that it isn't. */
10118 TYPE_DEPENDENT_P (itype
) = 0;
10119 TYPE_DEPENDENT_P_VALID (itype
) = 1;
10124 compute_array_index_type (tree name
, tree size
, tsubst_flags_t complain
)
10126 return compute_array_index_type_loc (input_location
, name
, size
, complain
);
10129 /* Returns the scope (if any) in which the entity declared by
10130 DECLARATOR will be located. If the entity was declared with an
10131 unqualified name, NULL_TREE is returned. */
10134 get_scope_of_declarator (const cp_declarator
*declarator
)
10136 while (declarator
&& declarator
->kind
!= cdk_id
)
10137 declarator
= declarator
->declarator
;
10139 /* If the declarator-id is a SCOPE_REF, the scope in which the
10140 declaration occurs is the first operand. */
10142 && declarator
->u
.id
.qualifying_scope
)
10143 return declarator
->u
.id
.qualifying_scope
;
10145 /* Otherwise, the declarator is not a qualified name; the entity will
10146 be declared in the current scope. */
10150 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
10151 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
10155 create_array_type_for_decl (tree name
, tree type
, tree size
, location_t loc
)
10157 tree itype
= NULL_TREE
;
10159 /* If things have already gone awry, bail now. */
10160 if (type
== error_mark_node
|| size
== error_mark_node
)
10161 return error_mark_node
;
10163 /* 8.3.4/1: If the type of the identifier of D contains the auto
10164 type-specifier, the program is ill-formed. */
10165 if (type_uses_auto (type
))
10168 error_at (loc
, "%qD declared as array of %qT", name
, type
);
10170 error ("creating array of %qT", type
);
10171 return error_mark_node
;
10174 /* If there are some types which cannot be array elements,
10175 issue an error-message and return. */
10176 switch (TREE_CODE (type
))
10180 error_at (loc
, "declaration of %qD as array of void", name
);
10182 error ("creating array of void");
10183 return error_mark_node
;
10185 case FUNCTION_TYPE
:
10187 error_at (loc
, "declaration of %qD as array of functions", name
);
10189 error ("creating array of functions");
10190 return error_mark_node
;
10192 case REFERENCE_TYPE
:
10194 error_at (loc
, "declaration of %qD as array of references", name
);
10196 error ("creating array of references");
10197 return error_mark_node
;
10201 error_at (loc
, "declaration of %qD as array of function members",
10204 error ("creating array of function members");
10205 return error_mark_node
;
10213 The constant expressions that specify the bounds of the arrays
10214 can be omitted only for the first member of the sequence. */
10215 if (TREE_CODE (type
) == ARRAY_TYPE
&& !TYPE_DOMAIN (type
))
10218 error_at (loc
, "declaration of %qD as multidimensional array must "
10219 "have bounds for all dimensions except the first",
10222 error ("multidimensional array must have bounds for all "
10223 "dimensions except the first");
10225 return error_mark_node
;
10228 /* Figure out the index type for the array. */
10230 itype
= compute_array_index_type_loc (loc
, name
, size
,
10231 tf_warning_or_error
);
10234 T is called the array element type; this type shall not be [...] an
10235 abstract class type. */
10236 abstract_virtuals_error (name
, type
);
10238 return build_cplus_array_type (type
, itype
);
10241 /* Returns the smallest location that is not UNKNOWN_LOCATION. */
10244 min_location (location_t loca
, location_t locb
)
10246 if (loca
== UNKNOWN_LOCATION
10247 || (locb
!= UNKNOWN_LOCATION
10248 && linemap_location_before_p (line_table
, locb
, loca
)))
10253 /* Returns the smallest location != UNKNOWN_LOCATION among the
10254 three stored in LOCATIONS[ds_const], LOCATIONS[ds_volatile],
10255 and LOCATIONS[ds_restrict]. */
10258 smallest_type_quals_location (int type_quals
, const location_t
* locations
)
10260 location_t loc
= UNKNOWN_LOCATION
;
10262 if (type_quals
& TYPE_QUAL_CONST
)
10263 loc
= locations
[ds_const
];
10265 if (type_quals
& TYPE_QUAL_VOLATILE
)
10266 loc
= min_location (loc
, locations
[ds_volatile
]);
10268 if (type_quals
& TYPE_QUAL_RESTRICT
)
10269 loc
= min_location (loc
, locations
[ds_restrict
]);
10274 /* Returns the smallest among the latter and locations[ds_type_spec]. */
10277 smallest_type_location (int type_quals
, const location_t
* locations
)
10279 location_t loc
= smallest_type_quals_location (type_quals
, locations
);
10280 return min_location (loc
, locations
[ds_type_spec
]);
10284 smallest_type_location (const cp_decl_specifier_seq
*declspecs
)
10286 int type_quals
= get_type_quals (declspecs
);
10287 return smallest_type_location (type_quals
, declspecs
->locations
);
10290 /* Check that it's OK to declare a function with the indicated TYPE
10291 and TYPE_QUALS. SFK indicates the kind of special function (if any)
10292 that this function is. OPTYPE is the type given in a conversion
10293 operator declaration, or the class type for a constructor/destructor.
10294 Returns the actual return type of the function; that may be different
10295 than TYPE if an error occurs, or for certain special functions. */
10298 check_special_function_return_type (special_function_kind sfk
,
10302 const location_t
* locations
)
10306 case sfk_constructor
:
10308 error_at (smallest_type_location (type_quals
, locations
),
10309 "return type specification for constructor invalid");
10310 else if (type_quals
!= TYPE_UNQUALIFIED
)
10311 error_at (smallest_type_quals_location (type_quals
, locations
),
10312 "qualifiers are not allowed on constructor declaration");
10314 if (targetm
.cxx
.cdtor_returns_this ())
10315 type
= build_pointer_type (optype
);
10317 type
= void_type_node
;
10320 case sfk_destructor
:
10322 error_at (smallest_type_location (type_quals
, locations
),
10323 "return type specification for destructor invalid");
10324 else if (type_quals
!= TYPE_UNQUALIFIED
)
10325 error_at (smallest_type_quals_location (type_quals
, locations
),
10326 "qualifiers are not allowed on destructor declaration");
10328 /* We can't use the proper return type here because we run into
10329 problems with ambiguous bases and covariant returns. */
10330 if (targetm
.cxx
.cdtor_returns_this ())
10331 type
= build_pointer_type (void_type_node
);
10333 type
= void_type_node
;
10336 case sfk_conversion
:
10338 error_at (smallest_type_location (type_quals
, locations
),
10339 "return type specified for %<operator %T%>", optype
);
10340 else if (type_quals
!= TYPE_UNQUALIFIED
)
10341 error_at (smallest_type_quals_location (type_quals
, locations
),
10342 "qualifiers are not allowed on declaration of "
10343 "%<operator %T%>", optype
);
10348 case sfk_deduction_guide
:
10350 error_at (smallest_type_location (type_quals
, locations
),
10351 "return type specified for deduction guide");
10352 else if (type_quals
!= TYPE_UNQUALIFIED
)
10353 error_at (smallest_type_quals_location (type_quals
, locations
),
10354 "qualifiers are not allowed on declaration of "
10355 "deduction guide");
10356 if (TREE_CODE (optype
) == TEMPLATE_TEMPLATE_PARM
)
10358 error ("template template parameter %qT in declaration of "
10359 "deduction guide", optype
);
10360 type
= error_mark_node
;
10363 type
= make_template_placeholder (CLASSTYPE_TI_TEMPLATE (optype
));
10364 for (int i
= 0; i
< ds_last
; ++i
)
10365 if (i
!= ds_explicit
&& locations
[i
])
10366 error_at (locations
[i
],
10367 "%<decl-specifier%> in declaration of deduction guide");
10371 gcc_unreachable ();
10377 /* A variable or data member (whose unqualified name is IDENTIFIER)
10378 has been declared with the indicated TYPE. If the TYPE is not
10379 acceptable, issue an error message and return a type to use for
10380 error-recovery purposes. */
10383 check_var_type (tree identifier
, tree type
, location_t loc
)
10385 if (VOID_TYPE_P (type
))
10388 error_at (loc
, "unnamed variable or field declared void");
10389 else if (identifier_p (identifier
))
10391 gcc_assert (!IDENTIFIER_ANY_OP_P (identifier
));
10392 error_at (loc
, "variable or field %qE declared void",
10396 error_at (loc
, "variable or field declared void");
10397 type
= error_mark_node
;
10403 /* Handle declaring DECL as an inline variable. */
10406 mark_inline_variable (tree decl
, location_t loc
)
10408 bool inlinep
= true;
10409 if (! toplevel_bindings_p ())
10411 error_at (loc
, "%<inline%> specifier invalid for variable "
10412 "%qD declared at block scope", decl
);
10415 else if (cxx_dialect
< cxx17
)
10416 pedwarn (loc
, 0, "inline variables are only available "
10417 "with %<-std=c++17%> or %<-std=gnu++17%>");
10420 retrofit_lang_decl (decl
);
10421 SET_DECL_VAR_DECLARED_INLINE_P (decl
);
10426 /* Assign a typedef-given name to a class or enumeration type declared
10427 as anonymous at first. This was split out of grokdeclarator
10428 because it is also used in libcc1. */
10431 name_unnamed_type (tree type
, tree decl
)
10433 gcc_assert (TYPE_UNNAMED_P (type
));
10435 /* Replace the anonymous name with the real name everywhere. */
10436 for (tree t
= TYPE_MAIN_VARIANT (type
); t
; t
= TYPE_NEXT_VARIANT (t
))
10437 if (IDENTIFIER_ANON_P (TYPE_IDENTIFIER (t
)))
10438 /* We do not rename the debug info representing the unnamed
10439 tagged type because the standard says in [dcl.typedef] that
10440 the naming applies only for linkage purposes. */
10441 /*debug_hooks->set_name (t, decl);*/
10442 TYPE_NAME (t
) = decl
;
10444 if (TYPE_LANG_SPECIFIC (type
))
10445 TYPE_WAS_UNNAMED (type
) = 1;
10447 /* If this is a typedef within a template class, the nested
10448 type is a (non-primary) template. The name for the
10449 template needs updating as well. */
10450 if (TYPE_LANG_SPECIFIC (type
) && CLASSTYPE_TEMPLATE_INFO (type
))
10451 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type
))
10452 = TYPE_IDENTIFIER (type
);
10454 /* Adjust linkage now that we aren't unnamed anymore. */
10455 reset_type_linkage (type
);
10457 /* FIXME remangle member functions; member functions of a
10458 type with external linkage have external linkage. */
10460 /* Check that our job is done, and that it would fail if we
10461 attempted to do it again. */
10462 gcc_assert (!TYPE_UNNAMED_P (type
));
10465 /* Given declspecs and a declarator (abstract or otherwise), determine
10466 the name and type of the object declared and construct a DECL node
10469 DECLSPECS points to the representation of declaration-specifier
10470 sequence that precedes declarator.
10472 DECL_CONTEXT says which syntactic context this declaration is in:
10473 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
10474 FUNCDEF for a function definition. Like NORMAL but a few different
10475 error messages in each case. Return value may be zero meaning
10476 this definition is too screwy to try to parse.
10477 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
10478 handle member functions (which have FIELD context).
10479 Return value may be zero meaning this definition is too screwy to
10481 PARM for a parameter declaration (either within a function prototype
10482 or before a function body). Make a PARM_DECL, or return void_type_node.
10483 TPARM for a template parameter declaration.
10484 CATCHPARM for a parameter declaration before a catch clause.
10485 TYPENAME if for a typename (in a cast or sizeof).
10486 Don't make a DECL node; just return the ..._TYPE node.
10487 FIELD for a struct or union field; make a FIELD_DECL.
10488 BITFIELD for a field with specified width.
10490 INITIALIZED is as for start_decl.
10492 ATTRLIST is a pointer to the list of attributes, which may be NULL
10493 if there are none; *ATTRLIST may be modified if attributes from inside
10494 the declarator should be applied to the declaration.
10496 When this function is called, scoping variables (such as
10497 CURRENT_CLASS_TYPE) should reflect the scope in which the
10498 declaration occurs, not the scope in which the new declaration will
10499 be placed. For example, on:
10501 void S::f() { ... }
10503 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
10506 Returns a DECL (if a declarator is present), a TYPE (if there is no
10507 declarator, in cases like "struct S;"), or the ERROR_MARK_NODE if an
10511 grokdeclarator (const cp_declarator
*declarator
,
10512 cp_decl_specifier_seq
*declspecs
,
10513 enum decl_context decl_context
,
10517 tree type
= NULL_TREE
;
10519 int explicit_intN
= 0;
10521 int virtualp
, explicitp
, friendp
, inlinep
, staticp
;
10522 int explicit_int
= 0;
10523 int explicit_char
= 0;
10524 int defaulted_int
= 0;
10526 tree typedef_decl
= NULL_TREE
;
10527 const char *name
= NULL
;
10528 tree typedef_type
= NULL_TREE
;
10529 /* True if this declarator is a function definition. */
10530 bool funcdef_flag
= false;
10531 cp_declarator_kind innermost_code
= cdk_error
;
10534 /* See the code below that used this. */
10535 tree decl_attr
= NULL_TREE
;
10538 /* Keep track of what sort of function is being processed
10539 so that we can warn about default return values, or explicit
10540 return values which do not match prescribed defaults. */
10541 special_function_kind sfk
= sfk_none
;
10543 tree dname
= NULL_TREE
;
10544 tree ctor_return_type
= NULL_TREE
;
10545 enum overload_flags flags
= NO_SPECIAL
;
10546 /* cv-qualifiers that apply to the declarator, for a declaration of
10547 a member function. */
10548 cp_cv_quals memfn_quals
= TYPE_UNQUALIFIED
;
10549 /* virt-specifiers that apply to the declarator, for a declaration of
10550 a member function. */
10551 cp_virt_specifiers virt_specifiers
= VIRT_SPEC_UNSPECIFIED
;
10552 /* ref-qualifier that applies to the declarator, for a declaration of
10553 a member function. */
10554 cp_ref_qualifier rqual
= REF_QUAL_NONE
;
10555 /* cv-qualifiers that apply to the type specified by the DECLSPECS. */
10556 int type_quals
= get_type_quals (declspecs
);
10557 tree raises
= NULL_TREE
;
10558 int template_count
= 0;
10559 tree returned_attrs
= NULL_TREE
;
10560 tree parms
= NULL_TREE
;
10561 const cp_declarator
*id_declarator
;
10562 /* The unqualified name of the declarator; either an
10563 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
10564 tree unqualified_id
;
10565 /* The class type, if any, in which this entity is located,
10566 or NULL_TREE if none. Note that this value may be different from
10567 the current class type; for example if an attempt is made to declare
10568 "A::f" inside "B", this value will be "A". */
10569 tree ctype
= current_class_type
;
10570 /* The NAMESPACE_DECL for the namespace in which this entity is
10571 located. If an unqualified name is used to declare the entity,
10572 this value will be NULL_TREE, even if the entity is located at
10573 namespace scope. */
10574 tree in_namespace
= NULL_TREE
;
10575 cp_storage_class storage_class
;
10576 bool unsigned_p
, signed_p
, short_p
, long_p
, thread_p
;
10577 bool type_was_error_mark_node
= false;
10578 bool parameter_pack_p
= declarator
? declarator
->parameter_pack_p
: false;
10579 bool template_type_arg
= false;
10580 bool template_parm_flag
= false;
10581 bool typedef_p
= decl_spec_seq_has_spec_p (declspecs
, ds_typedef
);
10582 bool constexpr_p
= decl_spec_seq_has_spec_p (declspecs
, ds_constexpr
);
10583 bool constinit_p
= decl_spec_seq_has_spec_p (declspecs
, ds_constinit
);
10584 bool late_return_type_p
= false;
10585 bool array_parameter_p
= false;
10586 tree reqs
= NULL_TREE
;
10588 signed_p
= decl_spec_seq_has_spec_p (declspecs
, ds_signed
);
10589 unsigned_p
= decl_spec_seq_has_spec_p (declspecs
, ds_unsigned
);
10590 short_p
= decl_spec_seq_has_spec_p (declspecs
, ds_short
);
10591 long_p
= decl_spec_seq_has_spec_p (declspecs
, ds_long
);
10592 longlong
= decl_spec_seq_has_spec_p (declspecs
, ds_long_long
);
10593 explicit_intN
= declspecs
->explicit_intN_p
;
10594 int_n_alt
= declspecs
->int_n_alt
;
10595 thread_p
= decl_spec_seq_has_spec_p (declspecs
, ds_thread
);
10597 // Was concept_p specified? Note that ds_concept
10598 // implies ds_constexpr!
10599 bool concept_p
= decl_spec_seq_has_spec_p (declspecs
, ds_concept
);
10601 constexpr_p
= true;
10603 if (decl_context
== FUNCDEF
)
10604 funcdef_flag
= true, decl_context
= NORMAL
;
10605 else if (decl_context
== MEMFUNCDEF
)
10606 funcdef_flag
= true, decl_context
= FIELD
;
10607 else if (decl_context
== BITFIELD
)
10608 bitfield
= 1, decl_context
= FIELD
;
10609 else if (decl_context
== TEMPLATE_TYPE_ARG
)
10610 template_type_arg
= true, decl_context
= TYPENAME
;
10611 else if (decl_context
== TPARM
)
10612 template_parm_flag
= true, decl_context
= PARM
;
10614 if (initialized
> 1)
10615 funcdef_flag
= true;
10617 location_t typespec_loc
= smallest_type_location (type_quals
,
10618 declspecs
->locations
);
10619 if (typespec_loc
== UNKNOWN_LOCATION
)
10620 typespec_loc
= input_location
;
10622 location_t id_loc
= declarator
? declarator
->id_loc
: input_location
;
10623 if (id_loc
== UNKNOWN_LOCATION
)
10624 id_loc
= input_location
;
10626 /* Look inside a declarator for the name being declared
10627 and get it as a string, for an error message. */
10628 for (id_declarator
= declarator
;
10630 id_declarator
= id_declarator
->declarator
)
10632 if (id_declarator
->kind
!= cdk_id
)
10633 innermost_code
= id_declarator
->kind
;
10635 switch (id_declarator
->kind
)
10638 if (id_declarator
->declarator
10639 && id_declarator
->declarator
->kind
== cdk_id
)
10641 sfk
= id_declarator
->declarator
->u
.id
.sfk
;
10642 if (sfk
== sfk_destructor
)
10649 tree qualifying_scope
= id_declarator
->u
.id
.qualifying_scope
;
10650 tree decl
= id_declarator
->u
.id
.unqualified_name
;
10653 if (qualifying_scope
)
10655 if (check_for_bare_parameter_packs (qualifying_scope
,
10656 id_declarator
->id_loc
))
10657 return error_mark_node
;
10658 if (at_function_scope_p ())
10662 A declarator-id shall not be qualified except
10665 None of the cases are permitted in block
10667 if (qualifying_scope
== global_namespace
)
10668 error ("invalid use of qualified-name %<::%D%>",
10670 else if (TYPE_P (qualifying_scope
))
10671 error ("invalid use of qualified-name %<%T::%D%>",
10672 qualifying_scope
, decl
);
10674 error ("invalid use of qualified-name %<%D::%D%>",
10675 qualifying_scope
, decl
);
10676 return error_mark_node
;
10678 else if (TYPE_P (qualifying_scope
))
10680 ctype
= qualifying_scope
;
10681 if (!MAYBE_CLASS_TYPE_P (ctype
))
10683 error_at (id_declarator
->id_loc
,
10684 "%q#T is not a class or namespace", ctype
);
10687 else if (innermost_code
!= cdk_function
10688 && current_class_type
10689 && !uniquely_derived_from_p (ctype
,
10690 current_class_type
))
10692 error_at (id_declarator
->id_loc
,
10693 "invalid use of qualified-name %<%T::%D%>",
10694 qualifying_scope
, decl
);
10695 return error_mark_node
;
10698 else if (TREE_CODE (qualifying_scope
) == NAMESPACE_DECL
)
10699 in_namespace
= qualifying_scope
;
10701 switch (TREE_CODE (decl
))
10705 if (innermost_code
!= cdk_function
)
10707 error_at (EXPR_LOCATION (decl
),
10708 "declaration of %qE as non-function", decl
);
10709 return error_mark_node
;
10711 else if (!qualifying_scope
10712 && !(current_class_type
&& at_class_scope_p ()))
10714 error_at (EXPR_LOCATION (decl
),
10715 "declaration of %qE as non-member", decl
);
10716 return error_mark_node
;
10719 tree type
= TREE_OPERAND (decl
, 0);
10721 type
= constructor_name (type
);
10722 name
= identifier_to_locale (IDENTIFIER_POINTER (type
));
10727 case TEMPLATE_ID_EXPR
:
10729 tree fns
= TREE_OPERAND (decl
, 0);
10732 if (!identifier_p (dname
))
10733 dname
= OVL_NAME (dname
);
10735 /* Fall through. */
10737 case IDENTIFIER_NODE
:
10738 if (identifier_p (decl
))
10741 if (IDENTIFIER_KEYWORD_P (dname
))
10743 error ("declarator-id missing; using reserved word %qD",
10745 name
= identifier_to_locale (IDENTIFIER_POINTER (dname
));
10747 else if (!IDENTIFIER_CONV_OP_P (dname
))
10748 name
= identifier_to_locale (IDENTIFIER_POINTER (dname
));
10751 gcc_assert (flags
== NO_SPECIAL
);
10752 flags
= TYPENAME_FLAG
;
10753 sfk
= sfk_conversion
;
10754 tree glob
= get_global_binding (dname
);
10755 if (glob
&& TREE_CODE (glob
) == TYPE_DECL
)
10756 name
= identifier_to_locale (IDENTIFIER_POINTER (dname
));
10758 name
= "<invalid operator>";
10763 gcc_unreachable ();
10770 case cdk_reference
:
10775 name
= "structured binding";
10779 return error_mark_node
;
10782 gcc_unreachable ();
10784 if (id_declarator
->kind
== cdk_id
)
10790 The declarator in a function-definition shall have the form
10791 D1 ( parameter-declaration-clause) ... */
10792 if (funcdef_flag
&& innermost_code
!= cdk_function
)
10794 error_at (id_loc
, "function definition does not declare parameters");
10795 return error_mark_node
;
10798 if (flags
== TYPENAME_FLAG
10799 && innermost_code
!= cdk_function
10800 && ! (ctype
&& !declspecs
->any_specifiers_p
))
10802 error_at (id_loc
, "declaration of %qD as non-function", dname
);
10803 return error_mark_node
;
10806 if (dname
&& identifier_p (dname
))
10808 if (UDLIT_OPER_P (dname
)
10809 && innermost_code
!= cdk_function
)
10811 error_at (id_loc
, "declaration of %qD as non-function", dname
);
10812 return error_mark_node
;
10815 if (IDENTIFIER_ANY_OP_P (dname
))
10819 error_at (id_loc
, "declaration of %qD as %<typedef%>", dname
);
10820 return error_mark_node
;
10822 else if (decl_context
== PARM
|| decl_context
== CATCHPARM
)
10824 error_at (id_loc
, "declaration of %qD as parameter", dname
);
10825 return error_mark_node
;
10830 /* Anything declared one level down from the top level
10831 must be one of the parameters of a function
10832 (because the body is at least two levels down). */
10834 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
10835 by not allowing C++ class definitions to specify their parameters
10836 with xdecls (must be spec.d in the parmlist).
10838 Since we now wait to push a class scope until we are sure that
10839 we are in a legitimate method context, we must set oldcname
10840 explicitly (since current_class_name is not yet alive).
10842 We also want to avoid calling this a PARM if it is in a namespace. */
10844 if (decl_context
== NORMAL
&& !toplevel_bindings_p ())
10846 cp_binding_level
*b
= current_binding_level
;
10847 current_binding_level
= b
->level_chain
;
10848 if (current_binding_level
!= 0 && toplevel_bindings_p ())
10849 decl_context
= PARM
;
10850 current_binding_level
= b
;
10854 name
= decl_context
== PARM
? "parameter" : "type name";
10856 if (concept_p
&& typedef_p
)
10858 error_at (declspecs
->locations
[ds_concept
],
10859 "%<concept%> cannot appear in a typedef declaration");
10860 return error_mark_node
;
10863 if (constexpr_p
&& typedef_p
)
10865 error_at (declspecs
->locations
[ds_constexpr
],
10866 "%<constexpr%> cannot appear in a typedef declaration");
10867 return error_mark_node
;
10870 if (constinit_p
&& typedef_p
)
10872 error_at (declspecs
->locations
[ds_constinit
],
10873 "%<constinit%> cannot appear in a typedef declaration");
10874 return error_mark_node
;
10877 /* [dcl.spec]/2 "At most one of the constexpr, consteval, and constinit
10878 keywords shall appear in a decl-specifier-seq." */
10879 if (constinit_p
&& constexpr_p
)
10881 gcc_rich_location
richloc (declspecs
->locations
[ds_constinit
]);
10882 richloc
.add_range (declspecs
->locations
[ds_constexpr
]);
10883 error_at (&richloc
,
10884 "can use at most one of the %<constinit%> and %<constexpr%> "
10886 return error_mark_node
;
10889 /* If there were multiple types specified in the decl-specifier-seq,
10890 issue an error message. */
10891 if (declspecs
->multiple_types_p
)
10893 error_at (typespec_loc
,
10894 "two or more data types in declaration of %qs", name
);
10895 return error_mark_node
;
10898 if (declspecs
->conflicting_specifiers_p
)
10900 error_at (min_location (declspecs
->locations
[ds_typedef
],
10901 declspecs
->locations
[ds_storage_class
]),
10902 "conflicting specifiers in declaration of %qs", name
);
10903 return error_mark_node
;
10906 /* Extract the basic type from the decl-specifier-seq. */
10907 type
= declspecs
->type
;
10908 if (type
== error_mark_node
)
10911 type_was_error_mark_node
= true;
10913 cp_warn_deprecated_use (type
);
10914 if (type
&& TREE_CODE (type
) == TYPE_DECL
)
10916 cp_warn_deprecated_use_scopes (CP_DECL_CONTEXT (type
));
10917 typedef_decl
= type
;
10918 type
= TREE_TYPE (typedef_decl
);
10919 if (DECL_ARTIFICIAL (typedef_decl
))
10920 cp_warn_deprecated_use (type
);
10922 /* No type at all: default to `int', and set DEFAULTED_INT
10923 because it was not a user-defined typedef. */
10924 if (type
== NULL_TREE
)
10926 if (signed_p
|| unsigned_p
|| long_p
|| short_p
)
10928 /* These imply 'int'. */
10929 type
= integer_type_node
;
10932 /* If we just have "complex", it is equivalent to "complex double". */
10933 else if (!longlong
&& !explicit_intN
10934 && decl_spec_seq_has_spec_p (declspecs
, ds_complex
))
10936 type
= double_type_node
;
10937 pedwarn (declspecs
->locations
[ds_complex
], OPT_Wpedantic
,
10938 "ISO C++ does not support plain %<complex%> meaning "
10939 "%<double complex%>");
10942 /* Gather flags. */
10943 explicit_int
= declspecs
->explicit_int_p
;
10944 explicit_char
= declspecs
->explicit_char_p
;
10947 /* See the code below that used this. */
10949 decl_attr
= DECL_ATTRIBUTES (typedef_decl
);
10951 typedef_type
= type
;
10953 if (sfk
== sfk_conversion
|| sfk
== sfk_deduction_guide
)
10954 ctor_return_type
= TREE_TYPE (dname
);
10956 ctor_return_type
= ctype
;
10958 if (sfk
!= sfk_none
)
10960 type
= check_special_function_return_type (sfk
, type
,
10963 declspecs
->locations
);
10964 type_quals
= TYPE_UNQUALIFIED
;
10966 else if (type
== NULL_TREE
)
10972 /* We handle `main' specially here, because 'main () { }' is so
10973 common. With no options, it is allowed. With -Wreturn-type,
10974 it is a warning. It is only an error with -pedantic-errors. */
10975 is_main
= (funcdef_flag
10976 && dname
&& identifier_p (dname
)
10977 && MAIN_NAME_P (dname
)
10978 && ctype
== NULL_TREE
10979 && in_namespace
== NULL_TREE
10980 && current_namespace
== global_namespace
);
10982 if (type_was_error_mark_node
)
10983 /* We've already issued an error, don't complain more. */;
10984 else if (in_system_header_at (id_loc
) || flag_ms_extensions
)
10985 /* Allow it, sigh. */;
10986 else if (! is_main
)
10987 permerror (id_loc
, "ISO C++ forbids declaration of %qs with no type",
10990 pedwarn (id_loc
, OPT_Wpedantic
,
10991 "ISO C++ forbids declaration of %qs with no type", name
);
10993 warning_at (id_loc
, OPT_Wreturn_type
,
10994 "ISO C++ forbids declaration of %qs with no type", name
);
10996 if (type_was_error_mark_node
&& template_parm_flag
)
10997 /* FIXME we should be able to propagate the error_mark_node as is
10998 for other contexts too. */
10999 type
= error_mark_node
;
11001 type
= integer_type_node
;
11008 if (! int_n_enabled_p
[declspecs
->int_n_idx
])
11010 error_at (declspecs
->locations
[ds_type_spec
],
11011 "%<__int%d%> is not supported by this target",
11012 int_n_data
[declspecs
->int_n_idx
].bitsize
);
11013 explicit_intN
= false;
11015 /* Don't pedwarn if the alternate "__intN__" form has been used instead
11017 else if (!int_n_alt
&& pedantic
)
11018 pedwarn (declspecs
->locations
[ds_type_spec
], OPT_Wpedantic
,
11019 "ISO C++ does not support %<__int%d%> for %qs",
11020 int_n_data
[declspecs
->int_n_idx
].bitsize
, name
);
11023 /* Now process the modifiers that were specified
11024 and check for invalid combinations. */
11026 /* Long double is a special combination. */
11027 if (long_p
&& !longlong
&& TYPE_MAIN_VARIANT (type
) == double_type_node
)
11030 type
= cp_build_qualified_type (long_double_type_node
,
11031 cp_type_quals (type
));
11034 /* Check all other uses of type modifiers. */
11036 if (unsigned_p
|| signed_p
|| long_p
|| short_p
)
11043 loc
= declspecs
->locations
[ds_unsigned
];
11048 loc
= declspecs
->locations
[ds_signed
];
11053 loc
= declspecs
->locations
[ds_long_long
];
11058 loc
= declspecs
->locations
[ds_long
];
11060 else /* if (short_p) */
11063 loc
= declspecs
->locations
[ds_short
];
11068 if (signed_p
&& unsigned_p
)
11070 gcc_rich_location
richloc (declspecs
->locations
[ds_signed
]);
11071 richloc
.add_range (declspecs
->locations
[ds_unsigned
]);
11072 error_at (&richloc
,
11073 "%<signed%> and %<unsigned%> specified together");
11075 else if (long_p
&& short_p
)
11077 gcc_rich_location
richloc (declspecs
->locations
[ds_long
]);
11078 richloc
.add_range (declspecs
->locations
[ds_short
]);
11079 error_at (&richloc
, "%<long%> and %<short%> specified together");
11081 else if (TREE_CODE (type
) != INTEGER_TYPE
11082 || type
== char8_type_node
11083 || type
== char16_type_node
11084 || type
== char32_type_node
11085 || ((long_p
|| short_p
)
11086 && (explicit_char
|| explicit_intN
)))
11087 error_at (loc
, "%qs specified with %qT", key
, type
);
11088 else if (!explicit_int
&& !defaulted_int
11089 && !explicit_char
&& !explicit_intN
)
11093 pedwarn (loc
, OPT_Wpedantic
, "%qs specified with %qT",
11095 ok
= !flag_pedantic_errors
;
11097 else if (declspecs
->decltype_p
)
11098 error_at (loc
, "%qs specified with %<decltype%>", key
);
11100 error_at (loc
, "%qs specified with %<typeof%>", key
);
11105 /* Discard the type modifiers if they are invalid. */
11108 unsigned_p
= false;
11116 /* Decide whether an integer type is signed or not.
11117 Optionally treat bitfields as signed by default. */
11121 It is implementation-defined whether a plain (neither
11122 explicitly signed or unsigned) char, short, int, or long
11123 bit-field is signed or unsigned.
11125 Naturally, we extend this to long long as well. Note that
11126 this does not include wchar_t. */
11127 || (bitfield
&& !flag_signed_bitfields
11129 /* A typedef for plain `int' without `signed' can be
11130 controlled just like plain `int', but a typedef for
11131 `signed int' cannot be so controlled. */
11133 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl
))
11134 && TREE_CODE (type
) == INTEGER_TYPE
11135 && !same_type_p (TYPE_MAIN_VARIANT (type
), wchar_type_node
)))
11138 type
= int_n_trees
[declspecs
->int_n_idx
].unsigned_type
;
11140 type
= long_long_unsigned_type_node
;
11142 type
= long_unsigned_type_node
;
11144 type
= short_unsigned_type_node
;
11145 else if (type
== char_type_node
)
11146 type
= unsigned_char_type_node
;
11147 else if (typedef_decl
)
11148 type
= unsigned_type_for (type
);
11150 type
= unsigned_type_node
;
11152 else if (signed_p
&& type
== char_type_node
)
11153 type
= signed_char_type_node
;
11154 else if (explicit_intN
)
11155 type
= int_n_trees
[declspecs
->int_n_idx
].signed_type
;
11157 type
= long_long_integer_type_node
;
11159 type
= long_integer_type_node
;
11161 type
= short_integer_type_node
;
11163 if (decl_spec_seq_has_spec_p (declspecs
, ds_complex
))
11165 if (TREE_CODE (type
) != INTEGER_TYPE
&& TREE_CODE (type
) != REAL_TYPE
)
11166 error_at (declspecs
->locations
[ds_complex
],
11167 "complex invalid for %qs", name
);
11168 /* If a modifier is specified, the resulting complex is the complex
11169 form of TYPE. E.g, "complex short" is "complex short int". */
11170 else if (type
== integer_type_node
)
11171 type
= complex_integer_type_node
;
11172 else if (type
== float_type_node
)
11173 type
= complex_float_type_node
;
11174 else if (type
== double_type_node
)
11175 type
= complex_double_type_node
;
11176 else if (type
== long_double_type_node
)
11177 type
= complex_long_double_type_node
;
11179 type
= build_complex_type (type
);
11182 /* If we're using the injected-class-name to form a compound type or a
11183 declaration, replace it with the underlying class so we don't get
11184 redundant typedefs in the debug output. But if we are returning the
11185 type unchanged, leave it alone so that it's available to
11186 maybe_get_template_decl_from_type_decl. */
11187 if (CLASS_TYPE_P (type
)
11188 && DECL_SELF_REFERENCE_P (TYPE_NAME (type
))
11189 && type
== TREE_TYPE (TYPE_NAME (type
))
11190 && (declarator
|| type_quals
))
11191 type
= DECL_ORIGINAL_TYPE (TYPE_NAME (type
));
11193 type_quals
|= cp_type_quals (type
);
11194 type
= cp_build_qualified_type_real
11195 (type
, type_quals
, ((((typedef_decl
&& !DECL_ARTIFICIAL (typedef_decl
))
11196 || declspecs
->decltype_p
)
11197 ? tf_ignore_bad_quals
: 0) | tf_warning_or_error
));
11198 /* We might have ignored or rejected some of the qualifiers. */
11199 type_quals
= cp_type_quals (type
);
11201 if (cxx_dialect
>= cxx17
&& type
&& is_auto (type
)
11202 && innermost_code
!= cdk_function
11203 && id_declarator
&& declarator
!= id_declarator
)
11204 if (tree tmpl
= CLASS_PLACEHOLDER_TEMPLATE (type
))
11206 error_at (typespec_loc
, "template placeholder type %qT must be followed "
11207 "by a simple declarator-id", type
);
11208 inform (DECL_SOURCE_LOCATION (tmpl
), "%qD declared here", tmpl
);
11209 type
= error_mark_node
;
11213 inlinep
= decl_spec_seq_has_spec_p (declspecs
, ds_inline
);
11214 virtualp
= decl_spec_seq_has_spec_p (declspecs
, ds_virtual
);
11215 explicitp
= decl_spec_seq_has_spec_p (declspecs
, ds_explicit
);
11217 storage_class
= declspecs
->storage_class
;
11218 if (storage_class
== sc_static
)
11219 staticp
= 1 + (decl_context
== FIELD
);
11225 gcc_rich_location
richloc (declspecs
->locations
[ds_virtual
]);
11226 richloc
.add_range (declspecs
->locations
[ds_storage_class
]);
11227 error_at (&richloc
, "member %qD cannot be declared both %<virtual%> "
11228 "and %<static%>", dname
);
11229 storage_class
= sc_none
;
11232 if (constexpr_p
&& cxx_dialect
< cxx2a
)
11234 gcc_rich_location
richloc (declspecs
->locations
[ds_virtual
]);
11235 richloc
.add_range (declspecs
->locations
[ds_constexpr
]);
11236 pedwarn (&richloc
, OPT_Wpedantic
, "member %qD can be declared both "
11237 "%<virtual%> and %<constexpr%> only in %<-std=c++2a%> or "
11238 "%<-std=gnu++2a%>", dname
);
11241 friendp
= decl_spec_seq_has_spec_p (declspecs
, ds_friend
);
11243 /* Issue errors about use of storage classes for parameters. */
11244 if (decl_context
== PARM
)
11248 error_at (declspecs
->locations
[ds_typedef
],
11249 "typedef declaration invalid in parameter declaration");
11250 return error_mark_node
;
11252 else if (template_parm_flag
&& storage_class
!= sc_none
)
11254 error_at (min_location (declspecs
->locations
[ds_thread
],
11255 declspecs
->locations
[ds_storage_class
]),
11256 "storage class specified for template parameter %qs",
11258 return error_mark_node
;
11260 else if (storage_class
== sc_static
11261 || storage_class
== sc_extern
11264 error_at (min_location (declspecs
->locations
[ds_thread
],
11265 declspecs
->locations
[ds_storage_class
]),
11266 "storage class specified for parameter %qs", name
);
11267 return error_mark_node
;
11270 /* Function parameters cannot be concept. */
11272 error_at (declspecs
->locations
[ds_concept
],
11273 "a parameter cannot be declared %<concept%>");
11274 /* Function parameters cannot be constexpr. If we saw one, moan
11275 and pretend it wasn't there. */
11276 else if (constexpr_p
)
11278 error_at (declspecs
->locations
[ds_constexpr
],
11279 "a parameter cannot be declared %<constexpr%>");
11282 else if (constinit_p
)
11284 error_at (declspecs
->locations
[ds_constinit
],
11285 "a parameter cannot be declared %<constinit%>");
11290 /* Give error if `virtual' is used outside of class declaration. */
11292 && (current_class_name
== NULL_TREE
|| decl_context
!= FIELD
))
11294 error_at (declspecs
->locations
[ds_virtual
],
11295 "%<virtual%> outside class declaration");
11299 if (innermost_code
== cdk_decomp
)
11301 location_t loc
= (declarator
->kind
== cdk_reference
11302 ? declarator
->declarator
->id_loc
: declarator
->id_loc
);
11304 error_at (declspecs
->locations
[ds_inline
],
11305 "structured binding declaration cannot be %qs", "inline");
11307 error_at (declspecs
->locations
[ds_typedef
],
11308 "structured binding declaration cannot be %qs", "typedef");
11310 error_at (declspecs
->locations
[ds_constexpr
], "structured "
11311 "binding declaration cannot be %qs", "constexpr");
11312 if (thread_p
&& cxx_dialect
< cxx2a
)
11313 pedwarn (declspecs
->locations
[ds_thread
], 0,
11314 "structured binding declaration can be %qs only in "
11315 "%<-std=c++2a%> or %<-std=gnu++2a%>",
11316 declspecs
->gnu_thread_keyword_p
11317 ? "__thread" : "thread_local");
11319 error_at (declspecs
->locations
[ds_concept
],
11320 "structured binding declaration cannot be %qs", "concept");
11321 /* [dcl.struct.bind] "A cv that includes volatile is deprecated." */
11322 if (type_quals
& TYPE_QUAL_VOLATILE
)
11323 warning_at (declspecs
->locations
[ds_volatile
], OPT_Wvolatile
,
11324 "%<volatile%>-qualified structured binding is deprecated");
11325 switch (storage_class
)
11330 error_at (loc
, "structured binding declaration cannot be %qs",
11334 if (cxx_dialect
< cxx2a
)
11336 "structured binding declaration can be %qs only in "
11337 "%<-std=c++2a%> or %<-std=gnu++2a%>", "static");
11340 error_at (loc
, "structured binding declaration cannot be %qs",
11344 error_at (loc
, "structured binding declaration cannot be %qs",
11348 error_at (loc
, "structured binding declaration cannot be "
11352 gcc_unreachable ();
11354 if (TREE_CODE (type
) != TEMPLATE_TYPE_PARM
11355 || TYPE_IDENTIFIER (type
) != auto_identifier
)
11357 if (type
!= error_mark_node
)
11359 error_at (loc
, "structured binding declaration cannot have "
11362 "type must be cv-qualified %<auto%> or reference to "
11363 "cv-qualified %<auto%>");
11365 type
= build_qualified_type (make_auto (), type_quals
);
11366 declspecs
->type
= type
;
11372 if (storage_class
!= sc_static
)
11374 storage_class
= sc_none
;
11375 declspecs
->storage_class
= sc_none
;
11379 /* Static anonymous unions are dealt with here. */
11380 if (staticp
&& decl_context
== TYPENAME
11382 && ANON_AGGR_TYPE_P (declspecs
->type
))
11383 decl_context
= FIELD
;
11385 /* Warn about storage classes that are invalid for certain
11386 kinds of declarations (parameters, typenames, etc.). */
11389 && storage_class
!= sc_extern
11390 && storage_class
!= sc_static
)
11394 = min_location (declspecs
->locations
[ds_thread
],
11395 declspecs
->locations
[ds_storage_class
]);
11396 error_at (loc
, "multiple storage classes in declaration of %qs", name
);
11399 if (decl_context
!= NORMAL
11400 && ((storage_class
!= sc_none
11401 && storage_class
!= sc_mutable
)
11404 if ((decl_context
== PARM
|| decl_context
== CATCHPARM
)
11405 && (storage_class
== sc_register
11406 || storage_class
== sc_auto
))
11408 else if (typedef_p
)
11410 else if (decl_context
== FIELD
11411 /* C++ allows static class elements. */
11412 && storage_class
== sc_static
)
11413 /* C++ also allows inlines and signed and unsigned elements,
11414 but in those cases we don't come in here. */
11419 = min_location (declspecs
->locations
[ds_thread
],
11420 declspecs
->locations
[ds_storage_class
]);
11421 if (decl_context
== FIELD
)
11422 error_at (loc
, "storage class specified for %qs", name
);
11423 else if (decl_context
== PARM
|| decl_context
== CATCHPARM
)
11424 error_at (loc
, "storage class specified for parameter %qs", name
);
11426 error_at (loc
, "storage class specified for typename");
11427 if (storage_class
== sc_register
11428 || storage_class
== sc_auto
11429 || storage_class
== sc_extern
11431 storage_class
= sc_none
;
11434 else if (storage_class
== sc_extern
&& funcdef_flag
11435 && ! toplevel_bindings_p ())
11436 error ("nested function %qs declared %<extern%>", name
);
11437 else if (toplevel_bindings_p ())
11439 if (storage_class
== sc_auto
)
11440 error_at (declspecs
->locations
[ds_storage_class
],
11441 "top-level declaration of %qs specifies %<auto%>", name
);
11444 && storage_class
!= sc_extern
11445 && storage_class
!= sc_static
)
11447 if (declspecs
->gnu_thread_keyword_p
)
11448 pedwarn (declspecs
->locations
[ds_thread
],
11449 0, "function-scope %qs implicitly auto and "
11450 "declared %<__thread%>", name
);
11452 /* When thread_local is applied to a variable of block scope the
11453 storage-class-specifier static is implied if it does not appear
11455 storage_class
= declspecs
->storage_class
= sc_static
;
11459 if (storage_class
&& friendp
)
11461 error_at (min_location (declspecs
->locations
[ds_thread
],
11462 declspecs
->locations
[ds_storage_class
]),
11463 "storage class specifiers invalid in friend function "
11465 storage_class
= sc_none
;
11469 if (!id_declarator
)
11470 unqualified_id
= NULL_TREE
;
11473 unqualified_id
= id_declarator
->u
.id
.unqualified_name
;
11474 switch (TREE_CODE (unqualified_id
))
11477 unqualified_id
= TREE_OPERAND (unqualified_id
, 0);
11478 if (TYPE_P (unqualified_id
))
11479 unqualified_id
= constructor_name (unqualified_id
);
11482 case IDENTIFIER_NODE
:
11483 case TEMPLATE_ID_EXPR
:
11487 gcc_unreachable ();
11491 if (declspecs
->std_attributes
)
11493 location_t attr_loc
= declspecs
->locations
[ds_std_attribute
];
11494 if (warning_at (attr_loc
, OPT_Wattributes
, "attribute ignored"))
11495 inform (attr_loc
, "an attribute that appertains to a type-specifier "
11499 /* Determine the type of the entity declared by recurring on the
11501 for (; declarator
; declarator
= declarator
->declarator
)
11503 const cp_declarator
*inner_declarator
;
11506 if (type
== error_mark_node
)
11507 return error_mark_node
;
11509 attrs
= declarator
->attributes
;
11515 if (declarator
== NULL
|| declarator
->kind
== cdk_id
)
11516 attr_flags
|= (int) ATTR_FLAG_DECL_NEXT
;
11517 if (declarator
->kind
== cdk_function
)
11518 attr_flags
|= (int) ATTR_FLAG_FUNCTION_NEXT
;
11519 if (declarator
->kind
== cdk_array
)
11520 attr_flags
|= (int) ATTR_FLAG_ARRAY_NEXT
;
11521 returned_attrs
= decl_attributes (&type
,
11522 chainon (returned_attrs
, attrs
),
11526 inner_declarator
= declarator
->declarator
;
11528 /* We don't want to warn in parameter context because we don't
11529 yet know if the parse will succeed, and this might turn out
11530 to be a constructor call. */
11531 if (decl_context
!= PARM
11532 && decl_context
!= TYPENAME
11534 && declarator
->parenthesized
!= UNKNOWN_LOCATION
11535 /* If the type is class-like and the inner name used a
11536 global namespace qualifier, we need the parens.
11537 Unfortunately all we can tell is whether a qualified name
11538 was used or not. */
11539 && !(inner_declarator
11540 && inner_declarator
->kind
== cdk_id
11541 && inner_declarator
->u
.id
.qualifying_scope
11542 && (MAYBE_CLASS_TYPE_P (type
)
11543 || TREE_CODE (type
) == ENUMERAL_TYPE
)))
11544 warning_at (declarator
->parenthesized
, OPT_Wparentheses
,
11545 "unnecessary parentheses in declaration of %qs", name
);
11546 if (declarator
->kind
== cdk_id
|| declarator
->kind
== cdk_decomp
)
11549 switch (declarator
->kind
)
11552 type
= create_array_type_for_decl (dname
, type
,
11553 declarator
->u
.array
.bounds
,
11554 declarator
->id_loc
);
11555 if (!valid_array_size_p (dname
11556 ? declarator
->id_loc
: input_location
,
11558 type
= error_mark_node
;
11560 if (declarator
->std_attributes
)
11563 The optional attribute-specifier-seq appertains to the
11565 returned_attrs
= chainon (returned_attrs
,
11566 declarator
->std_attributes
);
11574 /* Declaring a function type. */
11577 iloc_sentinel
ils (declspecs
->locations
[ds_type_spec
]);
11578 abstract_virtuals_error (ACU_RETURN
, type
);
11581 /* Pick up type qualifiers which should be applied to `this'. */
11582 memfn_quals
= declarator
->u
.function
.qualifiers
;
11583 /* Pick up virt-specifiers. */
11584 virt_specifiers
= declarator
->u
.function
.virt_specifiers
;
11585 /* And ref-qualifier, too */
11586 rqual
= declarator
->u
.function
.ref_qualifier
;
11587 /* And tx-qualifier. */
11588 tree tx_qual
= declarator
->u
.function
.tx_qualifier
;
11589 /* Pick up the exception specifications. */
11590 raises
= declarator
->u
.function
.exception_specification
;
11591 /* If the exception-specification is ill-formed, let's pretend
11592 there wasn't one. */
11593 if (raises
== error_mark_node
)
11594 raises
= NULL_TREE
;
11597 error_at (location_of (reqs
), "requires-clause on return type");
11598 reqs
= declarator
->u
.function
.requires_clause
;
11600 /* Say it's a definition only for the CALL_EXPR
11601 closest to the identifier. */
11602 funcdecl_p
= inner_declarator
&& inner_declarator
->kind
== cdk_id
;
11604 /* Handle a late-specified return type. */
11605 tree late_return_type
= declarator
->u
.function
.late_return_type
;
11607 /* This is the case e.g. for
11608 using T = auto () -> int. */
11609 || inner_declarator
== NULL
)
11611 if (tree auto_node
= type_uses_auto (type
))
11613 if (!late_return_type
)
11615 if (current_class_type
11616 && LAMBDA_TYPE_P (current_class_type
))
11617 /* OK for C++11 lambdas. */;
11618 else if (cxx_dialect
< cxx14
)
11620 error_at (typespec_loc
, "%qs function uses "
11621 "%<auto%> type specifier without "
11622 "trailing return type", name
);
11623 inform (typespec_loc
,
11624 "deduced return type only available "
11625 "with %<-std=c++14%> or %<-std=gnu++14%>");
11629 error_at (typespec_loc
, "virtual function "
11630 "cannot have deduced return type");
11634 else if (!is_auto (type
) && sfk
!= sfk_conversion
)
11636 error_at (typespec_loc
, "%qs function with trailing "
11637 "return type has %qT as its type rather "
11638 "than plain %<auto%>", name
, type
);
11639 return error_mark_node
;
11641 else if (is_auto (type
) && AUTO_IS_DECLTYPE (type
))
11644 error_at (typespec_loc
,
11645 "%qs function with trailing return type "
11646 "has %<decltype(auto)%> as its type "
11647 "rather than plain %<auto%>", name
);
11649 error_at (typespec_loc
,
11650 "invalid use of %<decltype(auto)%>");
11651 return error_mark_node
;
11653 tree tmpl
= CLASS_PLACEHOLDER_TEMPLATE (auto_node
);
11655 if (tree late_auto
= type_uses_auto (late_return_type
))
11656 tmpl
= CLASS_PLACEHOLDER_TEMPLATE (late_auto
);
11657 if (tmpl
&& funcdecl_p
)
11659 if (!dguide_name_p (unqualified_id
))
11661 error_at (declarator
->id_loc
, "deduced class "
11662 "type %qD in function return type",
11664 inform (DECL_SOURCE_LOCATION (tmpl
),
11665 "%qD declared here", tmpl
);
11666 return error_mark_node
;
11668 else if (!late_return_type
)
11670 error_at (declarator
->id_loc
, "deduction guide "
11671 "for %qT must have trailing return "
11672 "type", TREE_TYPE (tmpl
));
11673 inform (DECL_SOURCE_LOCATION (tmpl
),
11674 "%qD declared here", tmpl
);
11675 return error_mark_node
;
11677 else if (CLASS_TYPE_P (late_return_type
)
11678 && CLASSTYPE_TEMPLATE_INFO (late_return_type
)
11679 && (CLASSTYPE_TI_TEMPLATE (late_return_type
)
11683 error ("trailing return type %qT of deduction guide "
11684 "is not a specialization of %qT",
11685 late_return_type
, TREE_TYPE (tmpl
));
11688 else if (late_return_type
11689 && sfk
!= sfk_conversion
)
11691 if (late_return_type
== error_mark_node
)
11692 return error_mark_node
;
11693 if (cxx_dialect
< cxx11
)
11694 /* Not using maybe_warn_cpp0x because this should
11695 always be an error. */
11696 error_at (typespec_loc
,
11697 "trailing return type only available "
11698 "with %<-std=c++11%> or %<-std=gnu++11%>");
11700 error_at (typespec_loc
, "%qs function with trailing "
11701 "return type not declared with %<auto%> "
11702 "type specifier", name
);
11703 return error_mark_node
;
11706 type
= splice_late_return_type (type
, late_return_type
);
11707 if (type
== error_mark_node
)
11708 return error_mark_node
;
11710 if (late_return_type
)
11712 late_return_type_p
= true;
11713 type_quals
= cp_type_quals (type
);
11716 if (type_quals
!= TYPE_UNQUALIFIED
)
11718 if (SCALAR_TYPE_P (type
) || VOID_TYPE_P (type
))
11719 warning_at (typespec_loc
, OPT_Wignored_qualifiers
, "type "
11720 "qualifiers ignored on function return type");
11721 /* [dcl.fct] "A volatile-qualified return type is
11723 if (type_quals
& TYPE_QUAL_VOLATILE
)
11724 warning_at (typespec_loc
, OPT_Wvolatile
,
11725 "%<volatile%>-qualified return type is "
11728 /* We now know that the TYPE_QUALS don't apply to the
11729 decl, but to its return type. */
11730 type_quals
= TYPE_UNQUALIFIED
;
11733 /* Error about some types functions can't return. */
11735 if (TREE_CODE (type
) == FUNCTION_TYPE
)
11737 error_at (typespec_loc
, "%qs declared as function returning "
11738 "a function", name
);
11739 return error_mark_node
;
11741 if (TREE_CODE (type
) == ARRAY_TYPE
)
11743 error_at (typespec_loc
, "%qs declared as function returning "
11745 return error_mark_node
;
11749 error_at (declspecs
->locations
[ds_constinit
],
11750 "%<constinit%> on function return type is not "
11752 return error_mark_node
;
11754 /* Only plain decltype(auto) is allowed. */
11755 if (tree a
= type_uses_auto (type
))
11757 if (AUTO_IS_DECLTYPE (a
) && a
!= type
)
11759 error_at (typespec_loc
, "%qT as type rather than "
11760 "plain %<decltype(auto)%>", type
);
11761 return error_mark_node
;
11765 if (ctype
== NULL_TREE
11766 && decl_context
== FIELD
11769 ctype
= current_class_type
;
11771 if (ctype
&& (sfk
== sfk_constructor
11772 || sfk
== sfk_destructor
))
11774 /* We are within a class's scope. If our declarator name
11775 is the same as the class name, and we are defining
11776 a function, then it is a constructor/destructor, and
11777 therefore returns a void type. */
11779 /* ISO C++ 12.4/2. A destructor may not be declared
11780 const or volatile. A destructor may not be static.
11781 A destructor may not be declared with ref-qualifier.
11783 ISO C++ 12.1. A constructor may not be declared
11784 const or volatile. A constructor may not be
11785 virtual. A constructor may not be static.
11786 A constructor may not be declared with ref-qualifier. */
11788 error_at (declspecs
->locations
[ds_storage_class
],
11789 (flags
== DTOR_FLAG
)
11790 ? G_("destructor cannot be static member "
11792 : G_("constructor cannot be static member "
11796 error ((flags
== DTOR_FLAG
)
11797 ? G_("destructors may not be cv-qualified")
11798 : G_("constructors may not be cv-qualified"));
11799 memfn_quals
= TYPE_UNQUALIFIED
;
11804 maybe_warn_cpp0x (CPP0X_REF_QUALIFIER
);
11805 error ((flags
== DTOR_FLAG
)
11806 ? G_("destructors may not be ref-qualified")
11807 : G_("constructors may not be ref-qualified"));
11808 rqual
= REF_QUAL_NONE
;
11811 if (decl_context
== FIELD
11812 && !member_function_or_else (ctype
,
11813 current_class_type
,
11815 return error_mark_node
;
11817 if (flags
!= DTOR_FLAG
)
11819 /* It's a constructor. */
11820 if (explicitp
== 1)
11824 permerror (declspecs
->locations
[ds_virtual
],
11825 "constructors cannot be declared %<virtual%>");
11828 if (decl_context
== FIELD
11829 && sfk
!= sfk_constructor
)
11830 return error_mark_node
;
11832 if (decl_context
== FIELD
)
11839 /* Cannot be both friend and virtual. */
11840 gcc_rich_location
richloc (declspecs
->locations
[ds_virtual
]);
11841 richloc
.add_range (declspecs
->locations
[ds_friend
]);
11842 error_at (&richloc
, "virtual functions cannot be friends");
11845 if (decl_context
== NORMAL
)
11846 error_at (declarator
->id_loc
,
11847 "friend declaration not in class definition");
11848 if (current_function_decl
&& funcdef_flag
)
11850 error_at (declarator
->id_loc
,
11851 "cannot define friend function %qs in a local "
11852 "class definition", name
);
11855 /* [class.friend]/6: A function can be defined in a friend
11856 declaration if the function name is unqualified. */
11857 if (funcdef_flag
&& in_namespace
)
11859 if (in_namespace
== global_namespace
)
11860 error_at (declarator
->id_loc
,
11861 "friend function definition %qs cannot have "
11862 "a name qualified with %<::%>", name
);
11864 error_at (declarator
->id_loc
,
11865 "friend function definition %qs cannot have "
11866 "a name qualified with %<%D::%>", name
,
11870 else if (ctype
&& sfk
== sfk_conversion
)
11872 if (explicitp
== 1)
11874 maybe_warn_cpp0x (CPP0X_EXPLICIT_CONVERSION
);
11877 if (late_return_type_p
)
11878 error ("a conversion function cannot have a trailing return type");
11880 else if (sfk
== sfk_deduction_guide
)
11882 if (explicitp
== 1)
11886 tree pushed_scope
= NULL_TREE
;
11888 && decl_context
!= FIELD
11889 && inner_declarator
->u
.id
.qualifying_scope
11890 && CLASS_TYPE_P (inner_declarator
->u
.id
.qualifying_scope
))
11892 = push_scope (inner_declarator
->u
.id
.qualifying_scope
);
11894 arg_types
= grokparms (declarator
->u
.function
.parameters
, &parms
);
11897 pop_scope (pushed_scope
);
11899 if (inner_declarator
11900 && inner_declarator
->kind
== cdk_id
11901 && inner_declarator
->u
.id
.sfk
== sfk_destructor
11902 && arg_types
!= void_list_node
)
11904 error_at (declarator
->id_loc
,
11905 "destructors may not have parameters");
11906 arg_types
= void_list_node
;
11910 type
= build_function_type (type
, arg_types
);
11912 tree attrs
= declarator
->std_attributes
;
11915 tree att
= build_tree_list (tx_qual
, NULL_TREE
);
11916 /* transaction_safe applies to the type, but
11917 transaction_safe_dynamic applies to the function. */
11918 if (is_attribute_p ("transaction_safe", tx_qual
))
11919 attrs
= chainon (attrs
, att
);
11921 returned_attrs
= chainon (returned_attrs
, att
);
11926 The optional attribute-specifier-seq appertains to
11927 the function type. */
11928 decl_attributes (&type
, attrs
, 0);
11931 type
= build_exception_variant (type
, raises
);
11936 case cdk_reference
:
11938 /* Filter out pointers-to-references and references-to-references.
11939 We can get these if a TYPE_DECL is used. */
11941 if (TYPE_REF_P (type
))
11943 if (declarator
->kind
!= cdk_reference
)
11945 error ("cannot declare pointer to %q#T", type
);
11946 type
= TREE_TYPE (type
);
11949 /* In C++0x, we allow reference to reference declarations
11950 that occur indirectly through typedefs [7.1.3/8 dcl.typedef]
11951 and template type arguments [14.3.1/4 temp.arg.type]. The
11952 check for direct reference to reference declarations, which
11953 are still forbidden, occurs below. Reasoning behind the change
11954 can be found in DR106, DR540, and the rvalue reference
11956 else if (cxx_dialect
== cxx98
)
11958 error ("cannot declare reference to %q#T", type
);
11959 type
= TREE_TYPE (type
);
11962 else if (VOID_TYPE_P (type
))
11964 if (declarator
->kind
== cdk_reference
)
11965 error ("cannot declare reference to %q#T", type
);
11966 else if (declarator
->kind
== cdk_ptrmem
)
11967 error ("cannot declare pointer to %q#T member", type
);
11970 /* We now know that the TYPE_QUALS don't apply to the decl,
11971 but to the target of the pointer. */
11972 type_quals
= TYPE_UNQUALIFIED
;
11974 /* This code used to handle METHOD_TYPE, but I don't think it's
11975 possible to get it here anymore. */
11976 gcc_assert (TREE_CODE (type
) != METHOD_TYPE
);
11977 if (declarator
->kind
== cdk_ptrmem
11978 && TREE_CODE (type
) == FUNCTION_TYPE
)
11980 memfn_quals
|= type_memfn_quals (type
);
11981 type
= build_memfn_type (type
,
11982 declarator
->u
.pointer
.class_type
,
11985 if (type
== error_mark_node
)
11986 return error_mark_node
;
11988 rqual
= REF_QUAL_NONE
;
11989 memfn_quals
= TYPE_UNQUALIFIED
;
11992 if (TREE_CODE (type
) == FUNCTION_TYPE
11993 && (type_memfn_quals (type
) != TYPE_UNQUALIFIED
11994 || type_memfn_rqual (type
) != REF_QUAL_NONE
))
11995 error (declarator
->kind
== cdk_reference
11996 ? G_("cannot declare reference to qualified function type %qT")
11997 : G_("cannot declare pointer to qualified function type %qT"),
12000 /* When the pointed-to type involves components of variable size,
12001 care must be taken to ensure that the size evaluation code is
12002 emitted early enough to dominate all the possible later uses
12003 and late enough for the variables on which it depends to have
12006 This is expected to happen automatically when the pointed-to
12007 type has a name/declaration of it's own, but special attention
12008 is required if the type is anonymous.
12010 We handle the NORMAL and FIELD contexts here by inserting a
12011 dummy statement that just evaluates the size at a safe point
12012 and ensures it is not deferred until e.g. within a deeper
12013 conditional context (c++/43555).
12015 We expect nothing to be needed here for PARM or TYPENAME.
12016 Evaluating the size at this point for TYPENAME would
12017 actually be incorrect, as we might be in the middle of an
12018 expression with side effects on the pointed-to type size
12019 "arguments" prior to the pointer declaration point and the
12020 size evaluation could end up prior to the side effects. */
12022 if (!TYPE_NAME (type
)
12023 && (decl_context
== NORMAL
|| decl_context
== FIELD
)
12024 && at_function_scope_p ()
12025 && variably_modified_type_p (type
, NULL_TREE
))
12027 TYPE_NAME (type
) = build_decl (UNKNOWN_LOCATION
, TYPE_DECL
,
12029 add_decl_expr (TYPE_NAME (type
));
12032 if (declarator
->kind
== cdk_reference
)
12034 /* In C++0x, the type we are creating a reference to might be
12035 a typedef which is itself a reference type. In that case,
12036 we follow the reference collapsing rules in
12037 [7.1.3/8 dcl.typedef] to create the final reference type:
12039 "If a typedef TD names a type that is a reference to a type
12040 T, an attempt to create the type 'lvalue reference to cv TD'
12041 creates the type 'lvalue reference to T,' while an attempt
12042 to create the type "rvalue reference to cv TD' creates the
12045 if (VOID_TYPE_P (type
))
12046 /* We already gave an error. */;
12047 else if (TYPE_REF_P (type
))
12049 if (declarator
->u
.reference
.rvalue_ref
)
12050 /* Leave type alone. */;
12052 type
= cp_build_reference_type (TREE_TYPE (type
), false);
12055 type
= cp_build_reference_type
12056 (type
, declarator
->u
.reference
.rvalue_ref
);
12058 /* In C++0x, we need this check for direct reference to
12059 reference declarations, which are forbidden by
12060 [8.3.2/5 dcl.ref]. Reference to reference declarations
12061 are only allowed indirectly through typedefs and template
12062 type arguments. Example:
12064 void foo(int & &); // invalid ref-to-ref decl
12066 typedef int & int_ref;
12067 void foo(int_ref &); // valid ref-to-ref decl
12069 if (inner_declarator
&& inner_declarator
->kind
== cdk_reference
)
12070 error ("cannot declare reference to %q#T, which is not "
12071 "a typedef or a template type argument", type
);
12073 else if (TREE_CODE (type
) == METHOD_TYPE
)
12074 type
= build_ptrmemfunc_type (build_pointer_type (type
));
12075 else if (declarator
->kind
== cdk_ptrmem
)
12077 gcc_assert (TREE_CODE (declarator
->u
.pointer
.class_type
)
12078 != NAMESPACE_DECL
);
12079 if (declarator
->u
.pointer
.class_type
== error_mark_node
)
12080 /* We will already have complained. */
12081 type
= error_mark_node
;
12083 type
= build_ptrmem_type (declarator
->u
.pointer
.class_type
,
12087 type
= build_pointer_type (type
);
12089 /* Process a list of type modifier keywords (such as
12090 const or volatile) that were given inside the `*' or `&'. */
12092 if (declarator
->u
.pointer
.qualifiers
)
12095 = cp_build_qualified_type (type
,
12096 declarator
->u
.pointer
.qualifiers
);
12097 type_quals
= cp_type_quals (type
);
12100 /* Apply C++11 attributes to the pointer, and not to the
12101 type pointed to. This is unlike what is done for GNU
12102 attributes above. It is to comply with [dcl.ptr]/1:
12104 [the optional attribute-specifier-seq (7.6.1) appertains
12105 to the pointer and not to the object pointed to]. */
12106 if (declarator
->std_attributes
)
12107 decl_attributes (&type
, declarator
->std_attributes
,
12117 gcc_unreachable ();
12121 id_loc
= declarator
? declarator
->id_loc
: input_location
;
12123 /* A `constexpr' specifier used in an object declaration declares
12124 the object as `const'. */
12125 if (constexpr_p
&& innermost_code
!= cdk_function
)
12127 /* DR1688 says that a `constexpr' specifier in combination with
12128 `volatile' is valid. */
12130 if (!TYPE_REF_P (type
))
12132 type_quals
|= TYPE_QUAL_CONST
;
12133 type
= cp_build_qualified_type (type
, type_quals
);
12137 if (unqualified_id
&& TREE_CODE (unqualified_id
) == TEMPLATE_ID_EXPR
12138 && !FUNC_OR_METHOD_TYPE_P (type
)
12139 && !variable_template_p (TREE_OPERAND (unqualified_id
, 0)))
12141 error ("template-id %qD used as a declarator",
12143 unqualified_id
= dname
;
12146 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
12147 qualified with a class-name, turn it into a METHOD_TYPE, unless
12148 we know that the function is static. We take advantage of this
12149 opportunity to do other processing that pertains to entities
12150 explicitly declared to be class members. Note that if DECLARATOR
12151 is non-NULL, we know it is a cdk_id declarator; otherwise, we
12152 would not have exited the loop above. */
12154 && declarator
->kind
== cdk_id
12155 && declarator
->u
.id
.qualifying_scope
12156 && MAYBE_CLASS_TYPE_P (declarator
->u
.id
.qualifying_scope
))
12158 ctype
= declarator
->u
.id
.qualifying_scope
;
12159 ctype
= TYPE_MAIN_VARIANT (ctype
);
12160 template_count
= num_template_headers_for_class (ctype
);
12162 if (ctype
== current_class_type
)
12166 permerror (declspecs
->locations
[ds_friend
],
12167 "member functions are implicitly "
12168 "friends of their class");
12172 permerror (id_loc
, "extra qualification %<%T::%> on member %qs",
12175 else if (/* If the qualifying type is already complete, then we
12176 can skip the following checks. */
12177 !COMPLETE_TYPE_P (ctype
)
12178 && (/* If the function is being defined, then
12179 qualifying type must certainly be complete. */
12181 /* A friend declaration of "T::f" is OK, even if
12182 "T" is a template parameter. But, if this
12183 function is not a friend, the qualifying type
12184 must be a class. */
12185 || (!friendp
&& !CLASS_TYPE_P (ctype
))
12186 /* For a declaration, the type need not be
12187 complete, if either it is dependent (since there
12188 is no meaningful definition of complete in that
12189 case) or the qualifying class is currently being
12191 || !(dependent_type_p (ctype
)
12192 || currently_open_class (ctype
)))
12193 /* Check that the qualifying type is complete. */
12194 && !complete_type_or_else (ctype
, NULL_TREE
))
12195 return error_mark_node
;
12196 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
12198 if (current_class_type
12199 && (!friendp
|| funcdef_flag
|| initialized
))
12201 error_at (id_loc
, funcdef_flag
|| initialized
12202 ? G_("cannot define member function %<%T::%s%> "
12204 : G_("cannot declare member function %<%T::%s%> "
12206 ctype
, name
, current_class_type
);
12207 return error_mark_node
;
12210 else if (typedef_p
&& current_class_type
)
12212 error_at (id_loc
, "cannot declare member %<%T::%s%> within %qT",
12213 ctype
, name
, current_class_type
);
12214 return error_mark_node
;
12218 if (ctype
== NULL_TREE
&& decl_context
== FIELD
&& friendp
== 0)
12219 ctype
= current_class_type
;
12221 /* Now TYPE has the actual type. */
12223 if (returned_attrs
)
12226 *attrlist
= chainon (returned_attrs
, *attrlist
);
12228 attrlist
= &returned_attrs
;
12232 && declarator
->kind
== cdk_id
12233 && declarator
->std_attributes
12234 && attrlist
!= NULL
)
12236 /* [dcl.meaning]/1: The optional attribute-specifier-seq following
12237 a declarator-id appertains to the entity that is declared. */
12238 if (declarator
->std_attributes
!= error_mark_node
)
12239 *attrlist
= chainon (*attrlist
, declarator
->std_attributes
);
12241 /* We should have already diagnosed the issue (c++/78344). */
12242 gcc_assert (seen_error ());
12245 /* Handle parameter packs. */
12246 if (parameter_pack_p
)
12248 if (decl_context
== PARM
)
12249 /* Turn the type into a pack expansion.*/
12250 type
= make_pack_expansion (type
);
12252 error ("non-parameter %qs cannot be a parameter pack", name
);
12255 if ((decl_context
== FIELD
|| decl_context
== PARM
)
12256 && !processing_template_decl
12257 && variably_modified_type_p (type
, NULL_TREE
))
12259 if (decl_context
== FIELD
)
12261 "data member may not have variably modified type %qT", type
);
12264 "parameter may not have variably modified type %qT", type
);
12265 type
= error_mark_node
;
12268 if (explicitp
== 1 || (explicitp
&& friendp
))
12270 /* [dcl.fct.spec] (C++11) The explicit specifier shall be used only
12271 in the declaration of a constructor or conversion function within
12272 a class definition. */
12273 if (!current_class_type
)
12274 error_at (declspecs
->locations
[ds_explicit
],
12275 "%<explicit%> outside class declaration");
12277 error_at (declspecs
->locations
[ds_explicit
],
12278 "%<explicit%> in friend declaration");
12280 error_at (declspecs
->locations
[ds_explicit
],
12281 "only declarations of constructors and conversion operators "
12282 "can be %<explicit%>");
12286 if (storage_class
== sc_mutable
)
12288 location_t sloc
= declspecs
->locations
[ds_storage_class
];
12289 if (decl_context
!= FIELD
|| friendp
)
12291 error_at (sloc
, "non-member %qs cannot be declared %<mutable%>",
12293 storage_class
= sc_none
;
12295 else if (decl_context
== TYPENAME
|| typedef_p
)
12298 "non-object member %qs cannot be declared %<mutable%>",
12300 storage_class
= sc_none
;
12302 else if (FUNC_OR_METHOD_TYPE_P (type
))
12304 error_at (sloc
, "function %qs cannot be declared %<mutable%>",
12306 storage_class
= sc_none
;
12310 error_at (sloc
, "%<static%> %qs cannot be declared %<mutable%>",
12312 storage_class
= sc_none
;
12314 else if (type_quals
& TYPE_QUAL_CONST
)
12316 error_at (sloc
, "%<const%> %qs cannot be declared %<mutable%>",
12318 storage_class
= sc_none
;
12320 else if (TYPE_REF_P (type
))
12322 permerror (sloc
, "reference %qs cannot be declared %<mutable%>",
12324 storage_class
= sc_none
;
12328 /* If this is declaring a typedef name, return a TYPE_DECL. */
12329 if (typedef_p
&& decl_context
!= TYPENAME
)
12331 bool alias_p
= decl_spec_seq_has_spec_p (declspecs
, ds_alias
);
12336 if (decl_context
== NORMAL
)
12338 "typedef may not be a function definition");
12341 "typedef may not be a member function definition");
12342 return error_mark_node
;
12345 /* This declaration:
12347 typedef void f(int) const;
12349 declares a function type which is not a member of any
12350 particular class, but which is cv-qualified; for
12351 example "f S::*" declares a pointer to a const-qualified
12352 member function of S. We record the cv-qualification in the
12354 if ((rqual
|| memfn_quals
) && TREE_CODE (type
) == FUNCTION_TYPE
)
12356 type
= apply_memfn_quals (type
, memfn_quals
, rqual
);
12358 /* We have now dealt with these qualifiers. */
12359 memfn_quals
= TYPE_UNQUALIFIED
;
12360 rqual
= REF_QUAL_NONE
;
12363 if (type_uses_auto (type
))
12366 error_at (declspecs
->locations
[ds_type_spec
],
12367 "%<auto%> not allowed in alias declaration");
12369 error_at (declspecs
->locations
[ds_type_spec
],
12370 "typedef declared %<auto%>");
12371 type
= error_mark_node
;
12375 error_at (location_of (reqs
), "requires-clause on typedef");
12377 if (id_declarator
&& declarator
->u
.id
.qualifying_scope
)
12379 error_at (id_loc
, "typedef name may not be a nested-name-specifier");
12380 type
= error_mark_node
;
12383 if (decl_context
== FIELD
)
12384 decl
= build_lang_decl_loc (id_loc
, TYPE_DECL
, unqualified_id
, type
);
12386 decl
= build_decl (id_loc
, TYPE_DECL
, unqualified_id
, type
);
12388 if (decl_context
!= FIELD
)
12390 if (!current_function_decl
)
12391 DECL_CONTEXT (decl
) = FROB_CONTEXT (current_namespace
);
12392 else if (DECL_MAYBE_IN_CHARGE_CDTOR_P (current_function_decl
))
12393 /* The TYPE_DECL is "abstract" because there will be
12394 clones of this constructor/destructor, and there will
12395 be copies of this TYPE_DECL generated in those
12396 clones. The decloning optimization (for space) may
12397 revert this subsequently if it determines that
12398 the clones should share a common implementation. */
12399 DECL_ABSTRACT_P (decl
) = true;
12401 else if (current_class_type
12402 && constructor_name_p (unqualified_id
, current_class_type
))
12403 permerror (id_loc
, "ISO C++ forbids nested type %qD with same name "
12404 "as enclosing class",
12407 /* If the user declares "typedef struct {...} foo" then the
12408 struct will have an anonymous name. Fill that name in now.
12409 Nothing can refer to it, so nothing needs know about the name
12411 if (type
!= error_mark_node
12413 && TYPE_NAME (type
)
12414 && TREE_CODE (TYPE_NAME (type
)) == TYPE_DECL
12415 && TYPE_UNNAMED_P (type
)
12416 && declspecs
->type_definition_p
12417 && attributes_naming_typedef_ok (*attrlist
)
12418 && cp_type_quals (type
) == TYPE_UNQUALIFIED
)
12419 name_unnamed_type (type
, decl
);
12422 || (typedef_decl
&& C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl
)))
12423 C_TYPEDEF_EXPLICITLY_SIGNED (decl
) = 1;
12425 bad_specifiers (decl
, BSP_TYPE
, virtualp
,
12426 memfn_quals
!= TYPE_UNQUALIFIED
,
12427 inlinep
, friendp
, raises
!= NULL_TREE
,
12428 declspecs
->locations
);
12431 /* Acknowledge that this was written:
12432 `using analias = atype;'. */
12433 TYPE_DECL_ALIAS_P (decl
) = 1;
12438 /* Detect the case of an array type of unspecified size
12439 which came, as such, direct from a typedef name.
12440 We must copy the type, so that the array's domain can be
12441 individually set by the object's initializer. */
12443 if (type
&& typedef_type
12444 && TREE_CODE (type
) == ARRAY_TYPE
&& !TYPE_DOMAIN (type
)
12445 && TYPE_MAIN_VARIANT (type
) == TYPE_MAIN_VARIANT (typedef_type
))
12446 type
= build_cplus_array_type (TREE_TYPE (type
), NULL_TREE
);
12448 /* Detect where we're using a typedef of function type to declare a
12449 function. PARMS will not be set, so we must create it now. */
12451 if (type
== typedef_type
&& TREE_CODE (type
) == FUNCTION_TYPE
)
12453 tree decls
= NULL_TREE
;
12456 for (args
= TYPE_ARG_TYPES (type
);
12457 args
&& args
!= void_list_node
;
12458 args
= TREE_CHAIN (args
))
12460 tree decl
= cp_build_parm_decl (NULL_TREE
, NULL_TREE
,
12461 TREE_VALUE (args
));
12463 DECL_CHAIN (decl
) = decls
;
12467 parms
= nreverse (decls
);
12469 if (decl_context
!= TYPENAME
)
12471 /* The qualifiers on the function type become the qualifiers on
12472 the non-static member function. */
12473 memfn_quals
|= type_memfn_quals (type
);
12474 rqual
= type_memfn_rqual (type
);
12475 type_quals
= TYPE_UNQUALIFIED
;
12479 /* If this is a type name (such as, in a cast or sizeof),
12480 compute the type and return it now. */
12482 if (decl_context
== TYPENAME
)
12484 /* Note that here we don't care about type_quals. */
12486 /* Special case: "friend class foo" looks like a TYPENAME context. */
12491 error ("%<inline%> specified for friend class declaration");
12497 /* Don't allow friend declaration without a class-key. */
12498 if (TREE_CODE (type
) == TEMPLATE_TYPE_PARM
)
12499 permerror (input_location
, "template parameters cannot be friends");
12500 else if (TREE_CODE (type
) == TYPENAME_TYPE
)
12501 permerror (input_location
, "friend declaration requires class-key, "
12502 "i.e. %<friend class %T::%D%>",
12503 TYPE_CONTEXT (type
), TYPENAME_TYPE_FULLNAME (type
));
12505 permerror (input_location
, "friend declaration requires class-key, "
12506 "i.e. %<friend %#T%>",
12510 /* Only try to do this stuff if we didn't already give up. */
12511 if (type
!= integer_type_node
)
12513 /* A friendly class? */
12514 if (current_class_type
)
12515 make_friend_class (current_class_type
, TYPE_MAIN_VARIANT (type
),
12516 /*complain=*/true);
12518 error ("trying to make class %qT a friend of global scope",
12521 type
= void_type_node
;
12524 else if (memfn_quals
|| rqual
)
12526 if (ctype
== NULL_TREE
12527 && TREE_CODE (type
) == METHOD_TYPE
)
12528 ctype
= TYPE_METHOD_BASETYPE (type
);
12531 type
= build_memfn_type (type
, ctype
, memfn_quals
, rqual
);
12532 /* Core issue #547: need to allow this in template type args.
12533 Allow it in general in C++11 for alias-declarations. */
12534 else if ((template_type_arg
|| cxx_dialect
>= cxx11
)
12535 && TREE_CODE (type
) == FUNCTION_TYPE
)
12536 type
= apply_memfn_quals (type
, memfn_quals
, rqual
);
12538 error ("invalid qualifiers on non-member function type");
12542 error_at (location_of (reqs
), "requires-clause on type-id");
12546 else if (unqualified_id
== NULL_TREE
&& decl_context
!= PARM
12547 && decl_context
!= CATCHPARM
12548 && TREE_CODE (type
) != UNION_TYPE
12550 && innermost_code
!= cdk_decomp
)
12552 error ("abstract declarator %qT used as declaration", type
);
12553 return error_mark_node
;
12556 if (!FUNC_OR_METHOD_TYPE_P (type
))
12558 /* Only functions may be declared using an operator-function-id. */
12559 if (dname
&& IDENTIFIER_ANY_OP_P (dname
))
12561 error_at (id_loc
, "declaration of %qD as non-function", dname
);
12562 return error_mark_node
;
12566 error_at (location_of (reqs
),
12567 "requires-clause on declaration of non-function type %qT",
12571 /* We don't check parameter types here because we can emit a better
12572 error message later. */
12573 if (decl_context
!= PARM
)
12575 type
= check_var_type (unqualified_id
, type
, id_loc
);
12576 if (type
== error_mark_node
)
12577 return error_mark_node
;
12580 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
12581 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
12583 if (decl_context
== PARM
|| decl_context
== CATCHPARM
)
12585 if (ctype
|| in_namespace
)
12586 error ("cannot use %<::%> in parameter declaration");
12588 tree auto_node
= type_uses_auto (type
);
12589 if (auto_node
&& !(cxx_dialect
>= cxx17
&& template_parm_flag
))
12591 if (cxx_dialect
>= cxx14
)
12593 if (decl_context
== PARM
&& AUTO_IS_DECLTYPE (auto_node
))
12594 error_at (typespec_loc
,
12595 "cannot declare a parameter with %<decltype(auto)%>");
12597 error_at (typespec_loc
,
12598 "%<auto%> parameter not permitted in this context");
12601 error_at (typespec_loc
, "parameter declared %<auto%>");
12602 type
= error_mark_node
;
12605 /* A parameter declared as an array of T is really a pointer to T.
12606 One declared as a function is really a pointer to a function.
12607 One declared as a member is really a pointer to member. */
12609 if (TREE_CODE (type
) == ARRAY_TYPE
)
12611 /* Transfer const-ness of array into that of type pointed to. */
12612 type
= build_pointer_type (TREE_TYPE (type
));
12613 type_quals
= TYPE_UNQUALIFIED
;
12614 array_parameter_p
= true;
12616 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
12617 type
= build_pointer_type (type
);
12620 if (ctype
&& TREE_CODE (type
) == FUNCTION_TYPE
&& staticp
< 2
12621 && !(unqualified_id
12622 && identifier_p (unqualified_id
)
12623 && IDENTIFIER_NEWDEL_OP_P (unqualified_id
)))
12625 cp_cv_quals real_quals
= memfn_quals
;
12626 if (cxx_dialect
< cxx14
&& constexpr_p
12627 && sfk
!= sfk_constructor
&& sfk
!= sfk_destructor
)
12628 real_quals
|= TYPE_QUAL_CONST
;
12629 type
= build_memfn_type (type
, ctype
, real_quals
, rqual
);
12633 tree decl
= NULL_TREE
;
12635 if (decl_context
== PARM
)
12637 decl
= cp_build_parm_decl (NULL_TREE
, unqualified_id
, type
);
12638 DECL_ARRAY_PARAMETER_P (decl
) = array_parameter_p
;
12640 bad_specifiers (decl
, BSP_PARM
, virtualp
,
12641 memfn_quals
!= TYPE_UNQUALIFIED
,
12642 inlinep
, friendp
, raises
!= NULL_TREE
,
12643 declspecs
->locations
);
12645 else if (decl_context
== FIELD
)
12647 if (!staticp
&& !friendp
&& TREE_CODE (type
) != METHOD_TYPE
)
12648 if (tree auto_node
= type_uses_auto (type
))
12650 location_t tloc
= declspecs
->locations
[ds_type_spec
];
12651 if (CLASS_PLACEHOLDER_TEMPLATE (auto_node
))
12652 error_at (tloc
, "invalid use of template-name %qE without an "
12654 CLASS_PLACEHOLDER_TEMPLATE (auto_node
));
12656 error_at (tloc
, "non-static data member declared with "
12657 "placeholder %qT", auto_node
);
12658 type
= error_mark_node
;
12661 /* The C99 flexible array extension. */
12662 if (!staticp
&& TREE_CODE (type
) == ARRAY_TYPE
12663 && TYPE_DOMAIN (type
) == NULL_TREE
)
12666 && (TREE_CODE (ctype
) == UNION_TYPE
12667 || TREE_CODE (ctype
) == QUAL_UNION_TYPE
))
12669 error_at (id_loc
, "flexible array member in union");
12670 type
= error_mark_node
;
12674 /* Array is a flexible member. */
12676 pedwarn (id_loc
, OPT_Wpedantic
,
12677 "ISO C++ forbids flexible array member %qs", name
);
12679 pedwarn (input_location
, OPT_Wpedantic
,
12680 "ISO C++ forbids flexible array members");
12682 /* Flexible array member has a null domain. */
12683 type
= build_cplus_array_type (TREE_TYPE (type
), NULL_TREE
);
12687 if (type
== error_mark_node
)
12689 /* Happens when declaring arrays of sizes which
12690 are error_mark_node, for example. */
12693 else if (in_namespace
&& !friendp
)
12695 /* Something like struct S { int N::j; }; */
12696 error_at (id_loc
, "invalid use of %<::%>");
12697 return error_mark_node
;
12699 else if (FUNC_OR_METHOD_TYPE_P (type
) && unqualified_id
)
12702 tree function_context
;
12706 /* This should never happen in pure C++ (the check
12707 could be an assert). It could happen in
12708 Objective-C++ if someone writes invalid code that
12709 uses a function declaration for an instance
12710 variable or property (instance variables and
12711 properties are parsed as FIELD_DECLs, but they are
12712 part of an Objective-C class, not a C++ class).
12713 That code is invalid and is caught by this
12717 error ("declaration of function %qD in invalid context",
12719 return error_mark_node
;
12722 /* ``A union may [ ... ] not [ have ] virtual functions.''
12724 if (virtualp
&& TREE_CODE (ctype
) == UNION_TYPE
)
12726 error_at (declspecs
->locations
[ds_virtual
],
12727 "function %qD declared %<virtual%> inside a union",
12729 return error_mark_node
;
12733 && identifier_p (unqualified_id
)
12734 && IDENTIFIER_NEWDEL_OP_P (unqualified_id
))
12736 error_at (declspecs
->locations
[ds_virtual
],
12737 "%qD cannot be declared %<virtual%>, since it "
12738 "is always static", unqualified_id
);
12743 /* Check that the name used for a destructor makes sense. */
12744 if (sfk
== sfk_destructor
)
12746 tree uqname
= id_declarator
->u
.id
.unqualified_name
;
12750 gcc_assert (friendp
);
12751 error_at (id_loc
, "expected qualified name in friend "
12752 "declaration for destructor %qD", uqname
);
12753 return error_mark_node
;
12756 if (!check_dtor_name (ctype
, TREE_OPERAND (uqname
, 0)))
12758 error_at (id_loc
, "declaration of %qD as member of %qT",
12760 return error_mark_node
;
12764 error_at (declspecs
->locations
[ds_concept
],
12765 "a destructor cannot be %<concept%>");
12766 return error_mark_node
;
12768 if (constexpr_p
&& cxx_dialect
< cxx2a
)
12770 error_at (declspecs
->locations
[ds_constexpr
],
12771 "%<constexpr%> destructors only available"
12772 " with %<-std=c++2a%> or %<-std=gnu++2a%>");
12773 return error_mark_node
;
12776 else if (sfk
== sfk_constructor
&& friendp
&& !ctype
)
12778 error ("expected qualified name in friend declaration "
12779 "for constructor %qD",
12780 id_declarator
->u
.id
.unqualified_name
);
12781 return error_mark_node
;
12783 if (sfk
== sfk_constructor
)
12786 error_at (declspecs
->locations
[ds_concept
],
12787 "a constructor cannot be %<concept%>");
12788 return error_mark_node
;
12792 error_at (declspecs
->locations
[ds_concept
],
12793 "a concept cannot be a member function");
12797 if (TREE_CODE (unqualified_id
) == TEMPLATE_ID_EXPR
)
12799 tree tmpl
= TREE_OPERAND (unqualified_id
, 0);
12800 if (variable_template_p (tmpl
))
12802 error_at (id_loc
, "specialization of variable template "
12803 "%qD declared as function", tmpl
);
12804 inform (DECL_SOURCE_LOCATION (tmpl
),
12805 "variable template declared here");
12806 return error_mark_node
;
12810 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
12812 = (ctype
!= NULL_TREE
12813 ? decl_function_context (TYPE_MAIN_DECL (ctype
)) : NULL_TREE
);
12814 publicp
= ((! friendp
|| ! staticp
)
12815 && function_context
== NULL_TREE
);
12817 decl
= grokfndecl (ctype
, type
,
12818 TREE_CODE (unqualified_id
) != TEMPLATE_ID_EXPR
12819 ? unqualified_id
: dname
,
12824 virtualp
, flags
, memfn_quals
, rqual
, raises
,
12825 friendp
? -1 : 0, friendp
, publicp
,
12826 inlinep
| (2 * constexpr_p
) | (4 * concept_p
),
12827 initialized
== SD_DELETED
, sfk
,
12828 funcdef_flag
, late_return_type_p
,
12829 template_count
, in_namespace
,
12831 decl
= set_virt_specifiers (decl
, virt_specifiers
);
12832 if (decl
== NULL_TREE
)
12833 return error_mark_node
;
12835 /* This clobbers the attrs stored in `decl' from `attrlist'. */
12836 /* The decl and setting of decl_attr is also turned off. */
12837 decl
= build_decl_attribute_variant (decl
, decl_attr
);
12840 /* [class.conv.ctor]
12842 A constructor declared without the function-specifier
12843 explicit that can be called with a single parameter
12844 specifies a conversion from the type of its first
12845 parameter to the type of its class. Such a constructor
12846 is called a converting constructor. */
12847 if (explicitp
== 2)
12848 DECL_NONCONVERTING_P (decl
) = 1;
12850 if (declspecs
->explicit_specifier
)
12851 store_explicit_specifier (decl
, declspecs
->explicit_specifier
);
12853 else if (!staticp
&& !dependent_type_p (type
)
12854 && !COMPLETE_TYPE_P (complete_type (type
))
12855 && (!complete_or_array_type_p (type
)
12856 || initialized
== 0))
12858 if (TREE_CODE (type
) != ARRAY_TYPE
12859 || !COMPLETE_TYPE_P (TREE_TYPE (type
)))
12861 if (unqualified_id
)
12863 error_at (id_loc
, "field %qD has incomplete type %qT",
12864 unqualified_id
, type
);
12865 cxx_incomplete_type_inform (strip_array_types (type
));
12868 error ("name %qT has incomplete type", type
);
12870 type
= error_mark_node
;
12878 if (unqualified_id
)
12880 "%qE is neither function nor member function; "
12881 "cannot be declared friend", unqualified_id
);
12883 error ("unnamed field is neither function nor member "
12884 "function; cannot be declared friend");
12885 return error_mark_node
;
12892 /* Friends are treated specially. */
12893 if (ctype
== current_class_type
)
12894 ; /* We already issued a permerror. */
12895 else if (decl
&& DECL_NAME (decl
))
12897 if (template_class_depth (current_class_type
) == 0)
12899 decl
= check_explicit_specialization
12900 (unqualified_id
, decl
, template_count
,
12901 2 * funcdef_flag
+ 4);
12902 if (decl
== error_mark_node
)
12903 return error_mark_node
;
12906 decl
= do_friend (ctype
, unqualified_id
, decl
,
12912 return error_mark_node
;
12915 /* Structure field. It may not be a function, except for C++. */
12917 if (decl
== NULL_TREE
)
12921 /* C++ allows static class members. All other work
12922 for this is done by grokfield. */
12923 decl
= build_lang_decl_loc (id_loc
, VAR_DECL
,
12924 unqualified_id
, type
);
12925 set_linkage_for_static_data_member (decl
);
12927 error_at (declspecs
->locations
[ds_concept
],
12928 "static data member %qE declared %<concept%>",
12930 else if (constexpr_p
&& !initialized
)
12932 error_at (DECL_SOURCE_LOCATION (decl
),
12933 "%<constexpr%> static data member %qD must "
12934 "have an initializer", decl
);
12935 constexpr_p
= false;
12939 mark_inline_variable (decl
, declspecs
->locations
[ds_inline
]);
12941 if (!DECL_VAR_DECLARED_INLINE_P (decl
)
12942 && !(cxx_dialect
>= cxx17
&& constexpr_p
))
12943 /* Even if there is an in-class initialization, DECL
12944 is considered undefined until an out-of-class
12945 definition is provided, unless this is an inline
12947 DECL_EXTERNAL (decl
) = 1;
12951 CP_DECL_THREAD_LOCAL_P (decl
) = true;
12952 if (!processing_template_decl
)
12953 set_decl_tls_model (decl
, decl_default_tls_model (decl
));
12954 if (declspecs
->gnu_thread_keyword_p
)
12955 SET_DECL_GNU_TLS_P (decl
);
12961 error_at (declspecs
->locations
[ds_concept
],
12962 "non-static data member %qE declared %<concept%>",
12964 else if (constexpr_p
)
12966 error_at (declspecs
->locations
[ds_constexpr
],
12967 "non-static data member %qE declared "
12968 "%<constexpr%>", unqualified_id
);
12969 constexpr_p
= false;
12971 else if (constinit_p
)
12973 error_at (declspecs
->locations
[ds_constinit
],
12974 "non-static data member %qE declared "
12975 "%<constinit%>", unqualified_id
);
12976 constinit_p
= false;
12978 decl
= build_decl (id_loc
, FIELD_DECL
, unqualified_id
, type
);
12979 DECL_NONADDRESSABLE_P (decl
) = bitfield
;
12980 if (bitfield
&& !unqualified_id
)
12982 TREE_NO_WARNING (decl
) = 1;
12983 DECL_PADDING_P (decl
) = 1;
12986 if (storage_class
== sc_mutable
)
12988 DECL_MUTABLE_P (decl
) = 1;
12989 storage_class
= sc_none
;
12994 /* An attempt is being made to initialize a non-static
12995 member. This is new in C++11. */
12996 maybe_warn_cpp0x (CPP0X_NSDMI
);
12998 /* If this has been parsed with static storage class, but
12999 errors forced staticp to be cleared, ensure NSDMI is
13001 if (declspecs
->storage_class
== sc_static
)
13002 DECL_INITIAL (decl
) = error_mark_node
;
13006 bad_specifiers (decl
, BSP_FIELD
, virtualp
,
13007 memfn_quals
!= TYPE_UNQUALIFIED
,
13008 staticp
? false : inlinep
, friendp
,
13009 raises
!= NULL_TREE
,
13010 declspecs
->locations
);
13013 else if (FUNC_OR_METHOD_TYPE_P (type
))
13015 tree original_name
;
13018 if (!unqualified_id
)
13019 return error_mark_node
;
13021 if (TREE_CODE (unqualified_id
) == TEMPLATE_ID_EXPR
)
13022 original_name
= dname
;
13024 original_name
= unqualified_id
;
13025 // FIXME:gcc_assert (original_name == dname);
13027 if (storage_class
== sc_auto
)
13028 error_at (declspecs
->locations
[ds_storage_class
],
13029 "storage class %<auto%> invalid for function %qs", name
);
13030 else if (storage_class
== sc_register
)
13031 error_at (declspecs
->locations
[ds_storage_class
],
13032 "storage class %<register%> invalid for function %qs",
13036 if (declspecs
->gnu_thread_keyword_p
)
13037 error_at (declspecs
->locations
[ds_thread
],
13038 "storage class %<__thread%> invalid for function %qs",
13041 error_at (declspecs
->locations
[ds_thread
],
13042 "storage class %<thread_local%> invalid for "
13043 "function %qs", name
);
13046 if (virt_specifiers
)
13047 error ("virt-specifiers in %qs not allowed outside a class "
13048 "definition", name
);
13049 /* Function declaration not at top level.
13050 Storage classes other than `extern' are not allowed
13051 and `extern' makes no difference. */
13052 if (! toplevel_bindings_p ()
13053 && (storage_class
== sc_static
13054 || decl_spec_seq_has_spec_p (declspecs
, ds_inline
))
13057 if (storage_class
== sc_static
)
13058 pedwarn (declspecs
->locations
[ds_storage_class
], OPT_Wpedantic
,
13059 "%<static%> specifier invalid for function %qs "
13060 "declared out of global scope", name
);
13062 pedwarn (declspecs
->locations
[ds_inline
], OPT_Wpedantic
,
13063 "%<inline%> specifier invalid for function %qs "
13064 "declared out of global scope", name
);
13067 if (ctype
== NULL_TREE
)
13071 error ("virtual non-class function %qs", name
);
13074 else if (sfk
== sfk_constructor
13075 || sfk
== sfk_destructor
)
13077 error (funcdef_flag
13078 ? G_("%qs defined in a non-class scope")
13079 : G_("%qs declared in a non-class scope"), name
);
13084 /* Record whether the function is public. */
13085 publicp
= (ctype
!= NULL_TREE
13086 || storage_class
!= sc_static
);
13088 decl
= grokfndecl (ctype
, type
, original_name
, parms
, unqualified_id
,
13090 reqs
, virtualp
, flags
, memfn_quals
, rqual
, raises
,
13093 inlinep
| (2 * constexpr_p
) | (4 * concept_p
),
13094 initialized
== SD_DELETED
,
13097 late_return_type_p
,
13098 template_count
, in_namespace
, attrlist
,
13100 if (decl
== NULL_TREE
)
13101 return error_mark_node
;
13103 if (explicitp
== 2)
13104 DECL_NONCONVERTING_P (decl
) = 1;
13107 int invalid_static
= 0;
13109 /* Don't allow a static member function in a class, and forbid
13110 declaring main to be static. */
13111 if (TREE_CODE (type
) == METHOD_TYPE
)
13113 permerror (input_location
, "cannot declare member function %qD to have "
13114 "static linkage", decl
);
13115 invalid_static
= 1;
13117 else if (current_function_decl
)
13119 /* 7.1.1: There can be no static function declarations within a
13121 error_at (declspecs
->locations
[ds_storage_class
],
13122 "cannot declare static function inside another function");
13123 invalid_static
= 1;
13126 if (invalid_static
)
13129 storage_class
= sc_none
;
13135 /* It's a variable. */
13137 /* An uninitialized decl with `extern' is a reference. */
13138 decl
= grokvardecl (type
, dname
, unqualified_id
,
13145 ctype
? ctype
: in_namespace
,
13147 if (decl
== NULL_TREE
)
13148 return error_mark_node
;
13150 bad_specifiers (decl
, BSP_VAR
, virtualp
,
13151 memfn_quals
!= TYPE_UNQUALIFIED
,
13152 inlinep
, friendp
, raises
!= NULL_TREE
,
13153 declspecs
->locations
);
13157 DECL_CONTEXT (decl
) = ctype
;
13160 permerror (declspecs
->locations
[ds_storage_class
],
13161 "%<static%> may not be used when defining "
13162 "(as opposed to declaring) a static data member");
13164 storage_class
= sc_none
;
13166 if (storage_class
== sc_register
&& TREE_STATIC (decl
))
13168 error ("static member %qD declared %<register%>", decl
);
13169 storage_class
= sc_none
;
13171 if (storage_class
== sc_extern
&& pedantic
)
13173 pedwarn (input_location
, OPT_Wpedantic
,
13174 "cannot explicitly declare member %q#D to have "
13175 "extern linkage", decl
);
13176 storage_class
= sc_none
;
13179 else if (constexpr_p
&& DECL_EXTERNAL (decl
))
13181 error_at (DECL_SOURCE_LOCATION (decl
),
13182 "declaration of %<constexpr%> variable %qD "
13183 "is not a definition", decl
);
13184 constexpr_p
= false;
13188 mark_inline_variable (decl
, declspecs
->locations
[ds_inline
]);
13189 if (innermost_code
== cdk_decomp
)
13191 gcc_assert (declarator
&& declarator
->kind
== cdk_decomp
);
13192 DECL_SOURCE_LOCATION (decl
) = id_loc
;
13193 DECL_ARTIFICIAL (decl
) = 1;
13194 fit_decomposition_lang_decl (decl
, NULL_TREE
);
13198 if (VAR_P (decl
) && !initialized
)
13199 if (tree auto_node
= type_uses_auto (type
))
13200 if (!CLASS_PLACEHOLDER_TEMPLATE (auto_node
))
13202 location_t loc
= declspecs
->locations
[ds_type_spec
];
13203 error_at (loc
, "declaration of %q#D has no initializer", decl
);
13204 TREE_TYPE (decl
) = error_mark_node
;
13207 if (storage_class
== sc_extern
&& initialized
&& !funcdef_flag
)
13209 if (toplevel_bindings_p ())
13211 /* It's common practice (and completely valid) to have a const
13212 be initialized and declared extern. */
13213 if (!(type_quals
& TYPE_QUAL_CONST
))
13214 warning_at (DECL_SOURCE_LOCATION (decl
), 0,
13215 "%qs initialized and declared %<extern%>", name
);
13219 error_at (DECL_SOURCE_LOCATION (decl
),
13220 "%qs has both %<extern%> and initializer", name
);
13221 return error_mark_node
;
13225 /* Record `register' declaration for warnings on &
13226 and in case doing stupid register allocation. */
13228 if (storage_class
== sc_register
)
13230 DECL_REGISTER (decl
) = 1;
13231 /* Warn about register storage specifiers on PARM_DECLs. */
13232 if (TREE_CODE (decl
) == PARM_DECL
)
13234 if (cxx_dialect
>= cxx17
)
13235 pedwarn (DECL_SOURCE_LOCATION (decl
), OPT_Wregister
,
13236 "ISO C++17 does not allow %<register%> storage "
13237 "class specifier");
13239 warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wregister
,
13240 "%<register%> storage class specifier used");
13243 else if (storage_class
== sc_extern
)
13244 DECL_THIS_EXTERN (decl
) = 1;
13245 else if (storage_class
== sc_static
)
13246 DECL_THIS_STATIC (decl
) = 1;
13248 /* Set constexpr flag on vars (functions got it in grokfndecl). */
13249 if (constexpr_p
&& VAR_P (decl
))
13250 DECL_DECLARED_CONSTEXPR_P (decl
) = true;
13252 /* Record constancy and volatility on the DECL itself . There's
13253 no need to do this when processing a template; we'll do this
13254 for the instantiated declaration based on the type of DECL. */
13255 if (!processing_template_decl
)
13256 cp_apply_type_quals_to_decl (type_quals
, decl
);
13262 /* Subroutine of start_function. Ensure that each of the parameter
13263 types (as listed in PARMS) is complete, as is required for a
13264 function definition. */
13267 require_complete_types_for_parms (tree parms
)
13269 for (; parms
; parms
= DECL_CHAIN (parms
))
13271 if (dependent_type_p (TREE_TYPE (parms
)))
13273 if (!VOID_TYPE_P (TREE_TYPE (parms
))
13274 && complete_type_or_else (TREE_TYPE (parms
), parms
))
13276 relayout_decl (parms
);
13277 DECL_ARG_TYPE (parms
) = type_passed_as (TREE_TYPE (parms
));
13279 maybe_warn_parm_abi (TREE_TYPE (parms
),
13280 DECL_SOURCE_LOCATION (parms
));
13283 /* grokparms or complete_type_or_else will have already issued
13285 TREE_TYPE (parms
) = error_mark_node
;
13289 /* Returns nonzero if T is a local variable. */
13292 local_variable_p (const_tree t
)
13295 /* A VAR_DECL with a context that is a _TYPE is a static data
13297 && !TYPE_P (CP_DECL_CONTEXT (t
))
13298 /* Any other non-local variable must be at namespace scope. */
13299 && !DECL_NAMESPACE_SCOPE_P (t
))
13300 || (TREE_CODE (t
) == PARM_DECL
))
13306 /* Like local_variable_p, but suitable for use as a tree-walking
13310 local_variable_p_walkfn (tree
*tp
, int *walk_subtrees
,
13313 if (local_variable_p (*tp
)
13314 && (!DECL_ARTIFICIAL (*tp
) || DECL_NAME (*tp
) == this_identifier
))
13316 else if (TYPE_P (*tp
))
13317 *walk_subtrees
= 0;
13322 /* Check that ARG, which is a default-argument expression for a
13323 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
13324 something goes wrong. DECL may also be a _TYPE node, rather than a
13325 DECL, if there is no DECL available. */
13328 check_default_argument (tree decl
, tree arg
, tsubst_flags_t complain
)
13333 if (TREE_CODE (arg
) == DEFERRED_PARSE
)
13334 /* We get a DEFERRED_PARSE when looking at an in-class declaration
13335 with a default argument. Ignore the argument for now; we'll
13336 deal with it after the class is complete. */
13345 decl_type
= TREE_TYPE (decl
);
13347 if (arg
== error_mark_node
13348 || decl
== error_mark_node
13349 || TREE_TYPE (arg
) == error_mark_node
13350 || decl_type
== error_mark_node
)
13351 /* Something already went wrong. There's no need to check
13353 return error_mark_node
;
13355 /* [dcl.fct.default]
13357 A default argument expression is implicitly converted to the
13359 ++cp_unevaluated_operand
;
13360 /* Avoid digest_init clobbering the initializer. */
13361 tree carg
= BRACE_ENCLOSED_INITIALIZER_P (arg
) ? unshare_expr (arg
): arg
;
13362 perform_implicit_conversion_flags (decl_type
, carg
, complain
,
13364 --cp_unevaluated_operand
;
13366 /* Avoid redundant -Wzero-as-null-pointer-constant warnings at
13368 if (TYPE_PTR_OR_PTRMEM_P (decl_type
)
13369 && null_ptr_cst_p (arg
)
13370 /* Don't lose side-effects as in PR90473. */
13371 && !TREE_SIDE_EFFECTS (arg
))
13372 return nullptr_node
;
13374 /* [dcl.fct.default]
13376 Local variables shall not be used in default argument
13379 The keyword `this' shall not be used in a default argument of a
13380 member function. */
13381 var
= cp_walk_tree_without_duplicates (&arg
, local_variable_p_walkfn
, NULL
);
13384 if (complain
& tf_warning_or_error
)
13386 if (DECL_NAME (var
) == this_identifier
)
13387 permerror (input_location
, "default argument %qE uses %qD",
13390 error ("default argument %qE uses local variable %qD", arg
, var
);
13392 return error_mark_node
;
13399 /* Returns a deprecated type used within TYPE, or NULL_TREE if none. */
13402 type_is_deprecated (tree type
)
13404 enum tree_code code
;
13405 if (TREE_DEPRECATED (type
))
13407 if (TYPE_NAME (type
))
13409 if (TREE_DEPRECATED (TYPE_NAME (type
)))
13413 cp_warn_deprecated_use_scopes (CP_DECL_CONTEXT (TYPE_NAME (type
)));
13418 /* Do warn about using typedefs to a deprecated class. */
13419 if (OVERLOAD_TYPE_P (type
) && type
!= TYPE_MAIN_VARIANT (type
))
13420 return type_is_deprecated (TYPE_MAIN_VARIANT (type
));
13422 code
= TREE_CODE (type
);
13424 if (code
== POINTER_TYPE
|| code
== REFERENCE_TYPE
13425 || code
== OFFSET_TYPE
|| code
== FUNCTION_TYPE
13426 || code
== METHOD_TYPE
|| code
== ARRAY_TYPE
)
13427 return type_is_deprecated (TREE_TYPE (type
));
13429 if (TYPE_PTRMEMFUNC_P (type
))
13430 return type_is_deprecated
13431 (TREE_TYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (type
))));
13436 /* Decode the list of parameter types for a function type.
13437 Given the list of things declared inside the parens,
13438 return a list of types.
13440 If this parameter does not end with an ellipsis, we append
13443 *PARMS is set to the chain of PARM_DECLs created. */
13446 grokparms (tree parmlist
, tree
*parms
)
13448 tree result
= NULL_TREE
;
13449 tree decls
= NULL_TREE
;
13453 for (parm
= parmlist
; parm
!= NULL_TREE
; parm
= TREE_CHAIN (parm
))
13455 tree type
= NULL_TREE
;
13456 tree init
= TREE_PURPOSE (parm
);
13457 tree decl
= TREE_VALUE (parm
);
13459 if (parm
== void_list_node
)
13462 if (! decl
|| TREE_TYPE (decl
) == error_mark_node
)
13465 type
= TREE_TYPE (decl
);
13466 if (VOID_TYPE_P (type
))
13468 if (same_type_p (type
, void_type_node
)
13470 && !DECL_NAME (decl
) && !result
13471 && TREE_CHAIN (parm
) == void_list_node
)
13472 /* DR 577: A parameter list consisting of a single
13473 unnamed parameter of non-dependent type 'void'. */
13475 else if (cv_qualified_p (type
))
13476 error_at (DECL_SOURCE_LOCATION (decl
),
13477 "invalid use of cv-qualified type %qT in "
13478 "parameter declaration", type
);
13480 error_at (DECL_SOURCE_LOCATION (decl
),
13481 "invalid use of type %<void%> in parameter "
13483 /* It's not a good idea to actually create parameters of
13484 type `void'; other parts of the compiler assume that a
13485 void type terminates the parameter list. */
13486 type
= error_mark_node
;
13487 TREE_TYPE (decl
) = error_mark_node
;
13490 if (type
!= error_mark_node
)
13492 if (deprecated_state
!= DEPRECATED_SUPPRESS
)
13494 tree deptype
= type_is_deprecated (type
);
13496 cp_warn_deprecated_use (deptype
);
13499 /* [dcl.fct] "A parameter with volatile-qualified type is
13501 if (CP_TYPE_VOLATILE_P (type
))
13502 warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wvolatile
,
13503 "%<volatile%>-qualified parameter is "
13506 /* Top-level qualifiers on the parameters are
13507 ignored for function types. */
13508 type
= cp_build_qualified_type (type
, 0);
13509 if (TREE_CODE (type
) == METHOD_TYPE
)
13511 error ("parameter %qD invalidly declared method type", decl
);
13512 type
= build_pointer_type (type
);
13513 TREE_TYPE (decl
) = type
;
13515 else if (abstract_virtuals_error (decl
, type
))
13516 any_error
= 1; /* Seems like a good idea. */
13517 else if (cxx_dialect
< cxx17
&& INDIRECT_TYPE_P (type
))
13519 /* Before C++17 DR 393:
13520 [dcl.fct]/6, parameter types cannot contain pointers
13521 (references) to arrays of unknown bound. */
13522 tree t
= TREE_TYPE (type
);
13523 int ptr
= TYPE_PTR_P (type
);
13527 if (TYPE_PTR_P (t
))
13529 else if (TREE_CODE (t
) != ARRAY_TYPE
)
13531 else if (!TYPE_DOMAIN (t
))
13535 if (TREE_CODE (t
) == ARRAY_TYPE
)
13536 pedwarn (DECL_SOURCE_LOCATION (decl
), OPT_Wpedantic
,
13538 ? G_("parameter %qD includes pointer to array of "
13539 "unknown bound %qT")
13540 : G_("parameter %qD includes reference to array of "
13541 "unknown bound %qT"),
13547 else if (init
&& !processing_template_decl
)
13548 init
= check_default_argument (decl
, init
, tf_warning_or_error
);
13551 DECL_CHAIN (decl
) = decls
;
13553 result
= tree_cons (init
, type
, result
);
13555 decls
= nreverse (decls
);
13556 result
= nreverse (result
);
13558 result
= chainon (result
, void_list_node
);
13565 /* D is a constructor or overloaded `operator='.
13567 Let T be the class in which D is declared. Then, this function
13570 -1 if D's is an ill-formed constructor or copy assignment operator
13571 whose first parameter is of type `T'.
13572 0 if D is not a copy constructor or copy assignment
13574 1 if D is a copy constructor or copy assignment operator whose
13575 first parameter is a reference to non-const qualified T.
13576 2 if D is a copy constructor or copy assignment operator whose
13577 first parameter is a reference to const qualified T.
13579 This function can be used as a predicate. Positive values indicate
13580 a copy constructor and nonzero values indicate a copy assignment
13584 copy_fn_p (const_tree d
)
13590 gcc_assert (DECL_FUNCTION_MEMBER_P (d
));
13592 if (TREE_CODE (d
) == TEMPLATE_DECL
13593 || (DECL_TEMPLATE_INFO (d
)
13594 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d
))))
13595 /* Instantiations of template member functions are never copy
13596 functions. Note that member functions of templated classes are
13597 represented as template functions internally, and we must
13598 accept those as copy functions. */
13601 args
= FUNCTION_FIRST_USER_PARMTYPE (d
);
13605 arg_type
= TREE_VALUE (args
);
13606 if (arg_type
== error_mark_node
)
13609 if (TYPE_MAIN_VARIANT (arg_type
) == DECL_CONTEXT (d
))
13611 /* Pass by value copy assignment operator. */
13614 else if (TYPE_REF_P (arg_type
)
13615 && !TYPE_REF_IS_RVALUE (arg_type
)
13616 && TYPE_MAIN_VARIANT (TREE_TYPE (arg_type
)) == DECL_CONTEXT (d
))
13618 if (CP_TYPE_CONST_P (TREE_TYPE (arg_type
)))
13624 args
= TREE_CHAIN (args
);
13626 if (args
&& args
!= void_list_node
&& !TREE_PURPOSE (args
))
13627 /* There are more non-optional args. */
13633 /* D is a constructor or overloaded `operator='.
13635 Let T be the class in which D is declared. Then, this function
13636 returns true when D is a move constructor or move assignment
13637 operator, false otherwise. */
13640 move_fn_p (const_tree d
)
13642 gcc_assert (DECL_FUNCTION_MEMBER_P (d
));
13644 if (cxx_dialect
== cxx98
)
13645 /* There are no move constructors if we are in C++98 mode. */
13648 if (TREE_CODE (d
) == TEMPLATE_DECL
13649 || (DECL_TEMPLATE_INFO (d
)
13650 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d
))))
13651 /* Instantiations of template member functions are never move
13652 functions. Note that member functions of templated classes are
13653 represented as template functions internally, and we must
13654 accept those as move functions. */
13657 return move_signature_fn_p (d
);
13660 /* D is a constructor or overloaded `operator='.
13662 Then, this function returns true when D has the same signature as a move
13663 constructor or move assignment operator (because either it is such a
13664 ctor/op= or it is a template specialization with the same signature),
13665 false otherwise. */
13668 move_signature_fn_p (const_tree d
)
13672 bool result
= false;
13674 args
= FUNCTION_FIRST_USER_PARMTYPE (d
);
13678 arg_type
= TREE_VALUE (args
);
13679 if (arg_type
== error_mark_node
)
13682 if (TYPE_REF_P (arg_type
)
13683 && TYPE_REF_IS_RVALUE (arg_type
)
13684 && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (arg_type
)),
13688 args
= TREE_CHAIN (args
);
13690 if (args
&& args
!= void_list_node
&& !TREE_PURPOSE (args
))
13691 /* There are more non-optional args. */
13697 /* Remember any special properties of member function DECL. */
13700 grok_special_member_properties (tree decl
)
13704 if (TREE_CODE (decl
) == USING_DECL
13705 || !DECL_NONSTATIC_MEMBER_FUNCTION_P (decl
))
13708 class_type
= DECL_CONTEXT (decl
);
13709 if (IDENTIFIER_CTOR_P (DECL_NAME (decl
)))
13711 int ctor
= copy_fn_p (decl
);
13713 if (!DECL_ARTIFICIAL (decl
))
13714 TYPE_HAS_USER_CONSTRUCTOR (class_type
) = 1;
13720 A non-template constructor for class X is a copy
13721 constructor if its first parameter is of type X&, const
13722 X&, volatile X& or const volatile X&, and either there
13723 are no other parameters or else all other parameters have
13724 default arguments. */
13725 TYPE_HAS_COPY_CTOR (class_type
) = 1;
13727 TYPE_HAS_CONST_COPY_CTOR (class_type
) = 1;
13729 else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl
)))
13730 TYPE_HAS_DEFAULT_CONSTRUCTOR (class_type
) = 1;
13731 else if (is_list_ctor (decl
))
13732 TYPE_HAS_LIST_CTOR (class_type
) = 1;
13734 if (DECL_DECLARED_CONSTEXPR_P (decl
)
13735 && !ctor
&& !move_fn_p (decl
))
13736 TYPE_HAS_CONSTEXPR_CTOR (class_type
) = 1;
13738 else if (DECL_NAME (decl
) == assign_op_identifier
)
13742 A non-template assignment operator for class X is a copy
13743 assignment operator if its parameter is of type X, X&, const
13744 X&, volatile X& or const volatile X&. */
13746 int assop
= copy_fn_p (decl
);
13750 TYPE_HAS_COPY_ASSIGN (class_type
) = 1;
13752 TYPE_HAS_CONST_COPY_ASSIGN (class_type
) = 1;
13755 else if (IDENTIFIER_CONV_OP_P (DECL_NAME (decl
)))
13756 TYPE_HAS_CONVERSION (class_type
) = true;
13758 /* Destructors are handled in check_methods. */
13761 /* Check a constructor DECL has the correct form. Complains
13762 if the class has a constructor of the form X(X). */
13765 grok_ctor_properties (const_tree ctype
, const_tree decl
)
13767 int ctor_parm
= copy_fn_p (decl
);
13773 A declaration of a constructor for a class X is ill-formed if
13774 its first parameter is of type (optionally cv-qualified) X
13775 and either there are no other parameters or else all other
13776 parameters have default arguments.
13778 We *don't* complain about member template instantiations that
13779 have this form, though; they can occur as we try to decide
13780 what constructor to use during overload resolution. Since
13781 overload resolution will never prefer such a constructor to
13782 the non-template copy constructor (which is either explicitly
13783 or implicitly defined), there's no need to worry about their
13784 existence. Theoretically, they should never even be
13785 instantiated, but that's hard to forestall. */
13786 error_at (DECL_SOURCE_LOCATION (decl
),
13787 "invalid constructor; you probably meant %<%T (const %T&)%>",
13795 /* DECL is a declaration for an overloaded or conversion operator. If
13796 COMPLAIN is true, errors are issued for invalid declarations. */
13799 grok_op_properties (tree decl
, bool complain
)
13801 tree argtypes
= TYPE_ARG_TYPES (TREE_TYPE (decl
));
13802 bool methodp
= TREE_CODE (TREE_TYPE (decl
)) == METHOD_TYPE
;
13803 tree name
= DECL_NAME (decl
);
13804 location_t loc
= DECL_SOURCE_LOCATION (decl
);
13806 tree class_type
= DECL_CONTEXT (decl
);
13807 if (class_type
&& !CLASS_TYPE_P (class_type
))
13808 class_type
= NULL_TREE
;
13810 tree_code operator_code
;
13812 if (IDENTIFIER_CONV_OP_P (name
))
13814 /* Conversion operators are TYPE_EXPR for the purposes of this
13816 operator_code
= TYPE_EXPR
;
13817 op_flags
= OVL_OP_FLAG_UNARY
;
13821 const ovl_op_info_t
*ovl_op
= IDENTIFIER_OVL_OP_INFO (name
);
13823 operator_code
= ovl_op
->tree_code
;
13824 op_flags
= ovl_op
->flags
;
13825 gcc_checking_assert (operator_code
!= ERROR_MARK
);
13826 DECL_OVERLOADED_OPERATOR_CODE_RAW (decl
) = ovl_op
->ovl_op_code
;
13829 if (op_flags
& OVL_OP_FLAG_ALLOC
)
13831 /* operator new and operator delete are quite special. */
13835 case OVL_OP_FLAG_ALLOC
:
13836 TYPE_HAS_NEW_OPERATOR (class_type
) = 1;
13839 case OVL_OP_FLAG_ALLOC
| OVL_OP_FLAG_DELETE
:
13840 TYPE_GETS_DELETE (class_type
) |= 1;
13843 case OVL_OP_FLAG_ALLOC
| OVL_OP_FLAG_VEC
:
13844 TYPE_HAS_ARRAY_NEW_OPERATOR (class_type
) = 1;
13847 case OVL_OP_FLAG_ALLOC
| OVL_OP_FLAG_DELETE
| OVL_OP_FLAG_VEC
:
13848 TYPE_GETS_DELETE (class_type
) |= 2;
13852 gcc_unreachable ();
13855 /* [basic.std.dynamic.allocation]/1:
13857 A program is ill-formed if an allocation function is declared
13858 in a namespace scope other than global scope or declared
13859 static in global scope.
13861 The same also holds true for deallocation functions. */
13862 if (DECL_NAMESPACE_SCOPE_P (decl
))
13864 if (CP_DECL_CONTEXT (decl
) != global_namespace
)
13866 error_at (loc
, "%qD may not be declared within a namespace",
13871 if (!TREE_PUBLIC (decl
))
13873 error_at (loc
, "%qD may not be declared as static", decl
);
13878 if (op_flags
& OVL_OP_FLAG_DELETE
)
13880 DECL_SET_IS_OPERATOR_DELETE (decl
, true);
13881 coerce_delete_type (decl
, loc
);
13885 DECL_SET_IS_OPERATOR_NEW (decl
, true);
13886 TREE_TYPE (decl
) = coerce_new_type (TREE_TYPE (decl
), loc
);
13892 /* An operator function must either be a non-static member function
13893 or have at least one parameter of a class, a reference to a class,
13894 an enumeration, or a reference to an enumeration. 13.4.0.6 */
13895 if (! methodp
|| DECL_STATIC_FUNCTION_P (decl
))
13897 if (operator_code
== TYPE_EXPR
13898 || operator_code
== CALL_EXPR
13899 || operator_code
== COMPONENT_REF
13900 || operator_code
== ARRAY_REF
13901 || operator_code
== NOP_EXPR
)
13903 error_at (loc
, "%qD must be a nonstatic member function", decl
);
13907 if (DECL_STATIC_FUNCTION_P (decl
))
13909 error_at (loc
, "%qD must be either a non-static member "
13910 "function or a non-member function", decl
);
13914 for (tree arg
= argtypes
; ; arg
= TREE_CHAIN (arg
))
13916 if (!arg
|| arg
== void_list_node
)
13919 error_at(loc
, "%qD must have an argument of class or "
13920 "enumerated type", decl
);
13924 tree type
= non_reference (TREE_VALUE (arg
));
13925 if (type
== error_mark_node
)
13928 /* MAYBE_CLASS_TYPE_P, rather than CLASS_TYPE_P, is used
13929 because these checks are performed even on template
13931 if (MAYBE_CLASS_TYPE_P (type
)
13932 || TREE_CODE (type
) == ENUMERAL_TYPE
)
13937 if (operator_code
== CALL_EXPR
)
13938 /* There are no further restrictions on the arguments to an overloaded
13942 if (operator_code
== COND_EXPR
)
13945 error_at (loc
, "ISO C++ prohibits overloading %<operator ?:%>");
13949 /* Count the number of arguments and check for ellipsis. */
13951 for (tree arg
= argtypes
; arg
!= void_list_node
; arg
= TREE_CHAIN (arg
))
13956 error_at (loc
, "%qD must not have variable number of arguments",
13963 /* Verify correct number of arguments. */
13966 case OVL_OP_FLAG_AMBIARY
:
13969 /* We have a unary instance of an ambi-ary op. Remap to the
13971 unsigned alt
= ovl_op_alternate
[ovl_op_mapping
[operator_code
]];
13972 const ovl_op_info_t
*ovl_op
= &ovl_op_info
[false][alt
];
13973 gcc_checking_assert (ovl_op
->flags
== OVL_OP_FLAG_UNARY
);
13974 operator_code
= ovl_op
->tree_code
;
13975 DECL_OVERLOADED_OPERATOR_CODE_RAW (decl
) = ovl_op
->ovl_op_code
;
13977 else if (arity
!= 2)
13979 /* This was an ambiguous operator but is invalid. */
13982 ? G_("%qD must have either zero or one argument")
13983 : G_("%qD must have either one or two arguments"), decl
);
13986 else if ((operator_code
== POSTINCREMENT_EXPR
13987 || operator_code
== POSTDECREMENT_EXPR
)
13988 && ! processing_template_decl
13989 /* x++ and x--'s second argument must be an int. */
13990 && ! same_type_p (TREE_VALUE (TREE_CHAIN (argtypes
)),
13991 integer_type_node
))
13995 ? G_("postfix %qD must have %<int%> as its argument")
13996 : G_("postfix %qD must have %<int%> as its second argument"),
14002 case OVL_OP_FLAG_UNARY
:
14007 ? G_("%qD must have no arguments")
14008 : G_("%qD must have exactly one argument"), decl
);
14013 case OVL_OP_FLAG_BINARY
:
14018 ? G_("%qD must have exactly one argument")
14019 : G_("%qD must have exactly two arguments"), decl
);
14025 gcc_unreachable ();
14028 /* There can be no default arguments. */
14029 for (tree arg
= argtypes
; arg
!= void_list_node
; arg
= TREE_CHAIN (arg
))
14030 if (TREE_PURPOSE (arg
))
14032 TREE_PURPOSE (arg
) = NULL_TREE
;
14033 error_at (loc
, "%qD cannot have default arguments", decl
);
14037 /* At this point the declaration is well-formed. It may not be
14038 sensible though. */
14040 /* Check member function warnings only on the in-class declaration.
14041 There's no point warning on an out-of-class definition. */
14042 if (class_type
&& class_type
!= current_class_type
)
14045 /* Warn about conversion operators that will never be used. */
14046 if (IDENTIFIER_CONV_OP_P (name
)
14047 && ! DECL_TEMPLATE_INFO (decl
)
14048 && warn_class_conversion
)
14050 tree t
= TREE_TYPE (name
);
14051 int ref
= TYPE_REF_P (t
);
14054 t
= TYPE_MAIN_VARIANT (TREE_TYPE (t
));
14056 if (VOID_TYPE_P (t
))
14057 warning_at (loc
, OPT_Wclass_conversion
, "converting %qT to %<void%> "
14058 "will never use a type conversion operator", class_type
);
14059 else if (class_type
)
14061 if (same_type_ignoring_top_level_qualifiers_p (t
, class_type
))
14062 warning_at (loc
, OPT_Wclass_conversion
,
14064 ? G_("converting %qT to a reference to the same type "
14065 "will never use a type conversion operator")
14066 : G_("converting %qT to the same type "
14067 "will never use a type conversion operator"),
14069 /* Don't force t to be complete here. */
14070 else if (MAYBE_CLASS_TYPE_P (t
)
14071 && COMPLETE_TYPE_P (t
)
14072 && DERIVED_FROM_P (t
, class_type
))
14073 warning_at (loc
, OPT_Wclass_conversion
,
14075 ? G_("converting %qT to a reference to a base class "
14076 "%qT will never use a type conversion operator")
14077 : G_("converting %qT to a base class %qT "
14078 "will never use a type conversion operator"),
14086 /* Effective C++ rules below. */
14088 /* More Effective C++ rule 7. */
14089 if (operator_code
== TRUTH_ANDIF_EXPR
14090 || operator_code
== TRUTH_ORIF_EXPR
14091 || operator_code
== COMPOUND_EXPR
)
14092 warning_at (loc
, OPT_Weffc__
,
14093 "user-defined %qD always evaluates both arguments", decl
);
14095 /* More Effective C++ rule 6. */
14096 if (operator_code
== POSTINCREMENT_EXPR
14097 || operator_code
== POSTDECREMENT_EXPR
14098 || operator_code
== PREINCREMENT_EXPR
14099 || operator_code
== PREDECREMENT_EXPR
)
14101 tree arg
= TREE_VALUE (argtypes
);
14102 tree ret
= TREE_TYPE (TREE_TYPE (decl
));
14103 if (methodp
|| TYPE_REF_P (arg
))
14104 arg
= TREE_TYPE (arg
);
14105 arg
= TYPE_MAIN_VARIANT (arg
);
14107 if (operator_code
== PREINCREMENT_EXPR
14108 || operator_code
== PREDECREMENT_EXPR
)
14110 if (!TYPE_REF_P (ret
)
14111 || !same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (ret
)), arg
))
14112 warning_at (loc
, OPT_Weffc__
, "prefix %qD should return %qT", decl
,
14113 build_reference_type (arg
));
14117 if (!same_type_p (TYPE_MAIN_VARIANT (ret
), arg
))
14118 warning_at (loc
, OPT_Weffc__
,
14119 "postfix %qD should return %qT", decl
, arg
);
14123 /* Effective C++ rule 23. */
14124 if (!DECL_ASSIGNMENT_OPERATOR_P (decl
)
14125 && (operator_code
== PLUS_EXPR
14126 || operator_code
== MINUS_EXPR
14127 || operator_code
== TRUNC_DIV_EXPR
14128 || operator_code
== MULT_EXPR
14129 || operator_code
== TRUNC_MOD_EXPR
)
14130 && TYPE_REF_P (TREE_TYPE (TREE_TYPE (decl
))))
14131 warning_at (loc
, OPT_Weffc__
, "%qD should return by value", decl
);
14136 /* Return a string giving the keyword associate with CODE. */
14138 static const char *
14139 tag_name (enum tag_types code
)
14151 case typename_type
:
14154 gcc_unreachable ();
14158 /* Name lookup in an elaborated-type-specifier (after the keyword
14159 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
14160 elaborated-type-specifier is invalid, issue a diagnostic and return
14161 error_mark_node; otherwise, return the *_TYPE to which it referred.
14162 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
14165 check_elaborated_type_specifier (enum tag_types tag_code
,
14167 bool allow_template_p
)
14173 struct S { struct S *p; };
14175 name lookup will find the TYPE_DECL for the implicit "S::S"
14176 typedef. Adjust for that here. */
14177 if (DECL_SELF_REFERENCE_P (decl
))
14178 decl
= TYPE_NAME (TREE_TYPE (decl
));
14180 type
= TREE_TYPE (decl
);
14182 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
14183 is false for this case as well. */
14184 if (TREE_CODE (type
) == TEMPLATE_TYPE_PARM
)
14186 error ("using template type parameter %qT after %qs",
14187 type
, tag_name (tag_code
));
14188 return error_mark_node
;
14190 /* Accept template template parameters. */
14191 else if (allow_template_p
14192 && (TREE_CODE (type
) == BOUND_TEMPLATE_TEMPLATE_PARM
14193 || TREE_CODE (type
) == TEMPLATE_TEMPLATE_PARM
))
14197 If the identifier resolves to a typedef-name or the
14198 simple-template-id resolves to an alias template
14199 specialization, the elaborated-type-specifier is ill-formed.
14201 In other words, the only legitimate declaration to use in the
14202 elaborated type specifier is the implicit typedef created when
14203 the type is declared. */
14204 else if (!DECL_IMPLICIT_TYPEDEF_P (decl
)
14205 && !DECL_SELF_REFERENCE_P (decl
)
14206 && tag_code
!= typename_type
)
14208 if (alias_template_specialization_p (type
))
14209 error ("using alias template specialization %qT after %qs",
14210 type
, tag_name (tag_code
));
14212 error ("using typedef-name %qD after %qs", decl
, tag_name (tag_code
));
14213 inform (DECL_SOURCE_LOCATION (decl
),
14214 "%qD has a previous declaration here", decl
);
14215 return error_mark_node
;
14217 else if (TREE_CODE (type
) != RECORD_TYPE
14218 && TREE_CODE (type
) != UNION_TYPE
14219 && tag_code
!= enum_type
14220 && tag_code
!= typename_type
)
14222 error ("%qT referred to as %qs", type
, tag_name (tag_code
));
14223 inform (location_of (type
), "%qT has a previous declaration here", type
);
14224 return error_mark_node
;
14226 else if (TREE_CODE (type
) != ENUMERAL_TYPE
14227 && tag_code
== enum_type
)
14229 error ("%qT referred to as enum", type
);
14230 inform (location_of (type
), "%qT has a previous declaration here", type
);
14231 return error_mark_node
;
14233 else if (!allow_template_p
14234 && TREE_CODE (type
) == RECORD_TYPE
14235 && CLASSTYPE_IS_TEMPLATE (type
))
14237 /* If a class template appears as elaborated type specifier
14238 without a template header such as:
14240 template <class T> class C {};
14241 void f(class C); // No template header here
14243 then the required template argument is missing. */
14244 error ("template argument required for %<%s %T%>",
14245 tag_name (tag_code
),
14246 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type
)));
14247 return error_mark_node
;
14253 /* Lookup NAME in elaborate type specifier in scope according to
14254 SCOPE and issue diagnostics if necessary.
14255 Return *_TYPE node upon success, NULL_TREE when the NAME is not
14256 found, and ERROR_MARK_NODE for type error. */
14259 lookup_and_check_tag (enum tag_types tag_code
, tree name
,
14260 tag_scope scope
, bool template_header_p
)
14264 if (scope
== ts_global
)
14266 /* First try ordinary name lookup, ignoring hidden class name
14267 injected via friend declaration. */
14268 decl
= lookup_name_prefer_type (name
, 2);
14269 decl
= strip_using_decl (decl
);
14270 /* If that fails, the name will be placed in the smallest
14271 non-class, non-function-prototype scope according to 3.3.1/5.
14272 We may already have a hidden name declared as friend in this
14273 scope. So lookup again but not ignoring hidden names.
14274 If we find one, that name will be made visible rather than
14275 creating a new tag. */
14277 decl
= lookup_type_scope (name
, ts_within_enclosing_non_class
);
14280 decl
= lookup_type_scope (name
, scope
);
14283 && (DECL_CLASS_TEMPLATE_P (decl
)
14284 /* If scope is ts_current we're defining a class, so ignore a
14285 template template parameter. */
14286 || (scope
!= ts_current
14287 && DECL_TEMPLATE_TEMPLATE_PARM_P (decl
))))
14288 decl
= DECL_TEMPLATE_RESULT (decl
);
14290 if (decl
&& TREE_CODE (decl
) == TYPE_DECL
)
14292 /* Look for invalid nested type:
14296 if (scope
== ts_current
&& DECL_SELF_REFERENCE_P (decl
))
14298 error ("%qD has the same name as the class in which it is "
14301 return error_mark_node
;
14304 /* Two cases we need to consider when deciding if a class
14305 template is allowed as an elaborated type specifier:
14306 1. It is a self reference to its own class.
14307 2. It comes with a template header.
14311 template <class T> class C {
14312 class C *c1; // DECL_SELF_REFERENCE_P is true
14315 template <class U> class C; // template_header_p is true
14316 template <class T> class C<T>::D {
14317 class C *c2; // DECL_SELF_REFERENCE_P is true
14320 t
= check_elaborated_type_specifier (tag_code
,
14323 | DECL_SELF_REFERENCE_P (decl
));
14324 if (template_header_p
&& t
&& CLASS_TYPE_P (t
)
14325 && (!CLASSTYPE_TEMPLATE_INFO (t
)
14326 || (!PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (t
)))))
14328 error ("%qT is not a template", t
);
14329 inform (location_of (t
), "previous declaration here");
14330 if (TYPE_CLASS_SCOPE_P (t
)
14331 && CLASSTYPE_TEMPLATE_INFO (TYPE_CONTEXT (t
)))
14332 inform (input_location
,
14333 "perhaps you want to explicitly add %<%T::%>",
14335 t
= error_mark_node
;
14340 else if (decl
&& TREE_CODE (decl
) == TREE_LIST
)
14342 error ("reference to %qD is ambiguous", name
);
14343 print_candidates (decl
);
14344 return error_mark_node
;
14350 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
14351 Define the tag as a forward-reference if it is not defined.
14353 If a declaration is given, process it here, and report an error if
14354 multiple declarations are not identical.
14356 SCOPE is TS_CURRENT when this is also a definition. Only look in
14357 the current frame for the name (since C++ allows new names in any
14358 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
14359 declaration. Only look beginning from the current scope outward up
14360 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
14362 TEMPLATE_HEADER_P is true when this declaration is preceded by
14363 a set of template parameters. */
14366 xref_tag_1 (enum tag_types tag_code
, tree name
,
14367 tag_scope scope
, bool template_header_p
)
14369 enum tree_code code
;
14370 tree context
= NULL_TREE
;
14372 gcc_assert (identifier_p (name
));
14378 code
= RECORD_TYPE
;
14384 code
= ENUMERAL_TYPE
;
14387 gcc_unreachable ();
14390 /* In case of anonymous name, xref_tag is only called to
14391 make type node and push name. Name lookup is not required. */
14392 tree t
= NULL_TREE
;
14393 if (scope
!= ts_lambda
&& !IDENTIFIER_ANON_P (name
))
14394 t
= lookup_and_check_tag (tag_code
, name
, scope
, template_header_p
);
14396 if (t
== error_mark_node
)
14397 return error_mark_node
;
14399 if (scope
!= ts_current
&& t
&& current_class_type
14400 && template_class_depth (current_class_type
)
14401 && template_header_p
)
14403 if (TREE_CODE (t
) == TEMPLATE_TEMPLATE_PARM
)
14406 /* Since SCOPE is not TS_CURRENT, we are not looking at a
14407 definition of this tag. Since, in addition, we are currently
14408 processing a (member) template declaration of a template
14409 class, we must be very careful; consider:
14411 template <class X> struct S1
14413 template <class U> struct S2
14415 template <class V> friend struct S1;
14418 Here, the S2::S1 declaration should not be confused with the
14419 outer declaration. In particular, the inner version should
14420 have a template parameter of level 2, not level 1.
14422 On the other hand, when presented with:
14424 template <class T> struct S1
14426 template <class U> struct S2 {};
14427 template <class U> friend struct S2;
14430 the friend must find S1::S2 eventually. We accomplish this
14431 by making sure that the new type we create to represent this
14432 declaration has the right TYPE_CONTEXT. */
14433 context
= TYPE_CONTEXT (t
);
14439 /* If no such tag is yet defined, create a forward-reference node
14440 and record it as the "definition".
14441 When a real declaration of this type is found,
14442 the forward-reference will be altered into a real type. */
14443 if (code
== ENUMERAL_TYPE
)
14445 error ("use of enum %q#D without previous declaration", name
);
14446 return error_mark_node
;
14450 t
= make_class_type (code
);
14451 TYPE_CONTEXT (t
) = context
;
14452 if (scope
== ts_lambda
)
14454 /* Mark it as a lambda type. */
14455 CLASSTYPE_LAMBDA_EXPR (t
) = error_mark_node
;
14456 /* And push it into current scope. */
14457 scope
= ts_current
;
14459 t
= pushtag (name
, t
, scope
);
14464 if (template_header_p
&& MAYBE_CLASS_TYPE_P (t
))
14466 /* Check that we aren't trying to overload a class with different
14468 tree constr
= NULL_TREE
;
14469 if (current_template_parms
)
14471 tree reqs
= TEMPLATE_PARMS_CONSTRAINTS (current_template_parms
);
14472 constr
= build_constraints (reqs
, NULL_TREE
);
14474 if (!redeclare_class_template (t
, current_template_parms
, constr
))
14475 return error_mark_node
;
14477 else if (!processing_template_decl
14478 && CLASS_TYPE_P (t
)
14479 && CLASSTYPE_IS_TEMPLATE (t
))
14481 error ("redeclaration of %qT as a non-template", t
);
14482 inform (location_of (t
), "previous declaration %qD", t
);
14483 return error_mark_node
;
14486 if (scope
!= ts_within_enclosing_non_class
&& TYPE_HIDDEN_P (t
))
14488 /* This is no longer an invisible friend. Make it
14490 tree decl
= TYPE_NAME (t
);
14492 DECL_ANTICIPATED (decl
) = false;
14493 DECL_FRIEND_P (decl
) = false;
14495 if (TYPE_TEMPLATE_INFO (t
))
14497 tree tmpl
= TYPE_TI_TEMPLATE (t
);
14498 DECL_ANTICIPATED (tmpl
) = false;
14499 DECL_FRIEND_P (tmpl
) = false;
14507 /* Wrapper for xref_tag_1. */
14510 xref_tag (enum tag_types tag_code
, tree name
,
14511 tag_scope scope
, bool template_header_p
)
14515 subtime
= timevar_cond_start (TV_NAME_LOOKUP
);
14516 ret
= xref_tag_1 (tag_code
, name
, scope
, template_header_p
);
14517 timevar_cond_stop (TV_NAME_LOOKUP
, subtime
);
14523 xref_tag_from_type (tree old
, tree id
, tag_scope scope
)
14525 enum tag_types tag_kind
;
14527 if (TREE_CODE (old
) == RECORD_TYPE
)
14528 tag_kind
= (CLASSTYPE_DECLARED_CLASS (old
) ? class_type
: record_type
);
14530 tag_kind
= union_type
;
14532 if (id
== NULL_TREE
)
14533 id
= TYPE_IDENTIFIER (old
);
14535 return xref_tag (tag_kind
, id
, scope
, false);
14538 /* Create the binfo hierarchy for REF with (possibly NULL) base list
14539 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
14540 access_* node, and the TREE_VALUE is the type of the base-class.
14541 Non-NULL TREE_TYPE indicates virtual inheritance. */
14544 xref_basetypes (tree ref
, tree base_list
)
14547 tree binfo
, base_binfo
;
14548 unsigned max_vbases
= 0; /* Maximum direct & indirect virtual bases. */
14549 unsigned max_bases
= 0; /* Maximum direct bases. */
14550 unsigned max_dvbases
= 0; /* Maximum direct virtual bases. */
14552 tree default_access
;
14553 tree igo_prev
; /* Track Inheritance Graph Order. */
14555 if (ref
== error_mark_node
)
14558 /* The base of a derived class is private by default, all others are
14560 default_access
= (TREE_CODE (ref
) == RECORD_TYPE
14561 && CLASSTYPE_DECLARED_CLASS (ref
)
14562 ? access_private_node
: access_public_node
);
14564 /* First, make sure that any templates in base-classes are
14565 instantiated. This ensures that if we call ourselves recursively
14566 we do not get confused about which classes are marked and which
14568 basep
= &base_list
;
14571 tree basetype
= TREE_VALUE (*basep
);
14573 /* The dependent_type_p call below should really be dependent_scope_p
14574 so that we give a hard error about using an incomplete type as a
14575 base, but we allow it with a pedwarn for backward
14577 if (processing_template_decl
14578 && CLASS_TYPE_P (basetype
) && TYPE_BEING_DEFINED (basetype
))
14579 cxx_incomplete_type_diagnostic (NULL_TREE
, basetype
, DK_PEDWARN
);
14580 if (!dependent_type_p (basetype
)
14581 && !complete_type_or_else (basetype
, NULL
))
14582 /* An incomplete type. Remove it from the list. */
14583 *basep
= TREE_CHAIN (*basep
);
14587 if (TREE_TYPE (*basep
))
14589 if (CLASS_TYPE_P (basetype
))
14590 max_vbases
+= vec_safe_length (CLASSTYPE_VBASECLASSES (basetype
));
14591 basep
= &TREE_CHAIN (*basep
);
14594 max_vbases
+= max_dvbases
;
14596 TYPE_MARKED_P (ref
) = 1;
14598 /* The binfo slot should be empty, unless this is an (ill-formed)
14600 gcc_assert (!TYPE_BINFO (ref
) || TYPE_SIZE (ref
));
14602 gcc_assert (TYPE_MAIN_VARIANT (ref
) == ref
);
14604 binfo
= make_tree_binfo (max_bases
);
14606 TYPE_BINFO (ref
) = binfo
;
14607 BINFO_OFFSET (binfo
) = size_zero_node
;
14608 BINFO_TYPE (binfo
) = ref
;
14610 /* Apply base-class info set up to the variants of this type. */
14611 fixup_type_variants (ref
);
14615 vec_alloc (BINFO_BASE_ACCESSES (binfo
), max_bases
);
14616 /* A C++98 POD cannot have base classes. */
14617 CLASSTYPE_NON_LAYOUT_POD_P (ref
) = true;
14619 if (TREE_CODE (ref
) == UNION_TYPE
)
14621 error ("derived union %qT invalid", ref
);
14627 warning (OPT_Wmultiple_inheritance
,
14628 "%qT defined with multiple direct bases", ref
);
14632 /* An aggregate can't have virtual base classes. */
14633 CLASSTYPE_NON_AGGREGATE (ref
) = true;
14635 vec_alloc (CLASSTYPE_VBASECLASSES (ref
), max_vbases
);
14638 warning (OPT_Wvirtual_inheritance
,
14639 "%qT defined with direct virtual base", ref
);
14642 for (igo_prev
= binfo
; base_list
; base_list
= TREE_CHAIN (base_list
))
14644 tree access
= TREE_PURPOSE (base_list
);
14645 int via_virtual
= TREE_TYPE (base_list
) != NULL_TREE
;
14646 tree basetype
= TREE_VALUE (base_list
);
14648 if (access
== access_default_node
)
14649 access
= default_access
;
14651 /* Before C++17, an aggregate cannot have base classes. In C++17, an
14652 aggregate can't have virtual, private, or protected base classes. */
14653 if (cxx_dialect
< cxx17
14654 || access
!= access_public_node
14656 CLASSTYPE_NON_AGGREGATE (ref
) = true;
14658 if (PACK_EXPANSION_P (basetype
))
14659 basetype
= PACK_EXPANSION_PATTERN (basetype
);
14660 if (TREE_CODE (basetype
) == TYPE_DECL
)
14661 basetype
= TREE_TYPE (basetype
);
14662 if (!MAYBE_CLASS_TYPE_P (basetype
) || TREE_CODE (basetype
) == UNION_TYPE
)
14664 error ("base type %qT fails to be a struct or class type",
14669 base_binfo
= NULL_TREE
;
14670 if (CLASS_TYPE_P (basetype
) && !dependent_scope_p (basetype
))
14672 base_binfo
= TYPE_BINFO (basetype
);
14673 /* The original basetype could have been a typedef'd type. */
14674 basetype
= BINFO_TYPE (base_binfo
);
14676 /* Inherit flags from the base. */
14677 TYPE_HAS_NEW_OPERATOR (ref
)
14678 |= TYPE_HAS_NEW_OPERATOR (basetype
);
14679 TYPE_HAS_ARRAY_NEW_OPERATOR (ref
)
14680 |= TYPE_HAS_ARRAY_NEW_OPERATOR (basetype
);
14681 TYPE_GETS_DELETE (ref
) |= TYPE_GETS_DELETE (basetype
);
14682 TYPE_HAS_CONVERSION (ref
) |= TYPE_HAS_CONVERSION (basetype
);
14683 CLASSTYPE_DIAMOND_SHAPED_P (ref
)
14684 |= CLASSTYPE_DIAMOND_SHAPED_P (basetype
);
14685 CLASSTYPE_REPEATED_BASE_P (ref
)
14686 |= CLASSTYPE_REPEATED_BASE_P (basetype
);
14689 /* We must do this test after we've seen through a typedef
14691 if (TYPE_MARKED_P (basetype
))
14693 if (basetype
== ref
)
14694 error ("recursive type %qT undefined", basetype
);
14696 error ("duplicate base type %qT invalid", basetype
);
14700 if (PACK_EXPANSION_P (TREE_VALUE (base_list
)))
14701 /* Regenerate the pack expansion for the bases. */
14702 basetype
= make_pack_expansion (basetype
);
14704 TYPE_MARKED_P (basetype
) = 1;
14706 base_binfo
= copy_binfo (base_binfo
, basetype
, ref
,
14707 &igo_prev
, via_virtual
);
14708 if (!BINFO_INHERITANCE_CHAIN (base_binfo
))
14709 BINFO_INHERITANCE_CHAIN (base_binfo
) = binfo
;
14711 BINFO_BASE_APPEND (binfo
, base_binfo
);
14712 BINFO_BASE_ACCESS_APPEND (binfo
, access
);
14716 /* Update max_vbases to reflect the reality that we are dropping
14717 this base: if it reaches zero we want to undo the vec_alloc
14718 above to avoid inconsistencies during error-recovery: eg, in
14719 build_special_member_call, CLASSTYPE_VBASECLASSES non null
14720 and vtt null (c++/27952). */
14723 if (CLASS_TYPE_P (basetype
))
14725 -= vec_safe_length (CLASSTYPE_VBASECLASSES (basetype
));
14728 if (CLASSTYPE_VBASECLASSES (ref
)
14729 && max_vbases
== 0)
14730 vec_free (CLASSTYPE_VBASECLASSES (ref
));
14732 if (vec_safe_length (CLASSTYPE_VBASECLASSES (ref
)) < max_vbases
)
14733 /* If we didn't get max_vbases vbases, we must have shared at
14734 least one of them, and are therefore diamond shaped. */
14735 CLASSTYPE_DIAMOND_SHAPED_P (ref
) = 1;
14737 /* Unmark all the types. */
14738 for (i
= 0; BINFO_BASE_ITERATE (binfo
, i
, base_binfo
); i
++)
14739 TYPE_MARKED_P (BINFO_TYPE (base_binfo
)) = 0;
14740 TYPE_MARKED_P (ref
) = 0;
14742 /* Now see if we have a repeated base type. */
14743 if (!CLASSTYPE_REPEATED_BASE_P (ref
))
14745 for (base_binfo
= binfo
; base_binfo
;
14746 base_binfo
= TREE_CHAIN (base_binfo
))
14748 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo
)))
14750 CLASSTYPE_REPEATED_BASE_P (ref
) = 1;
14753 TYPE_MARKED_P (BINFO_TYPE (base_binfo
)) = 1;
14755 for (base_binfo
= binfo
; base_binfo
;
14756 base_binfo
= TREE_CHAIN (base_binfo
))
14757 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo
)))
14758 TYPE_MARKED_P (BINFO_TYPE (base_binfo
)) = 0;
14765 /* Copies the enum-related properties from type SRC to type DST.
14766 Used with the underlying type of an enum and the enum itself. */
14768 copy_type_enum (tree dst
, tree src
)
14771 for (t
= dst
; t
; t
= TYPE_NEXT_VARIANT (t
))
14773 TYPE_MIN_VALUE (t
) = TYPE_MIN_VALUE (src
);
14774 TYPE_MAX_VALUE (t
) = TYPE_MAX_VALUE (src
);
14775 TYPE_SIZE (t
) = TYPE_SIZE (src
);
14776 TYPE_SIZE_UNIT (t
) = TYPE_SIZE_UNIT (src
);
14777 SET_TYPE_MODE (dst
, TYPE_MODE (src
));
14778 TYPE_PRECISION (t
) = TYPE_PRECISION (src
);
14779 unsigned valign
= TYPE_ALIGN (src
);
14780 if (TYPE_USER_ALIGN (t
))
14781 valign
= MAX (valign
, TYPE_ALIGN (t
));
14783 TYPE_USER_ALIGN (t
) = TYPE_USER_ALIGN (src
);
14784 SET_TYPE_ALIGN (t
, valign
);
14785 TYPE_UNSIGNED (t
) = TYPE_UNSIGNED (src
);
14789 /* Begin compiling the definition of an enumeration type.
14792 if ENUMTYPE is not NULL_TREE then the type has alredy been found.
14794 UNDERLYING_TYPE is the type that will be used as the storage for
14795 the enumeration type. This should be NULL_TREE if no storage type
14798 ATTRIBUTES are any attributes specified after the enum-key.
14800 SCOPED_ENUM_P is true if this is a scoped enumeration type.
14802 if IS_NEW is not NULL, gets TRUE iff a new type is created.
14804 Returns the type object, as yet incomplete.
14805 Also records info about it so that build_enumerator
14806 may be used to declare the individual values as they are read. */
14809 start_enum (tree name
, tree enumtype
, tree underlying_type
,
14810 tree attributes
, bool scoped_enum_p
, bool *is_new
)
14812 tree prevtype
= NULL_TREE
;
14813 gcc_assert (identifier_p (name
));
14817 /* [C++0x dcl.enum]p5:
14819 If not explicitly specified, the underlying type of a scoped
14820 enumeration type is int. */
14821 if (!underlying_type
&& scoped_enum_p
)
14822 underlying_type
= integer_type_node
;
14824 if (underlying_type
)
14825 underlying_type
= cv_unqualified (underlying_type
);
14827 /* If this is the real definition for a previous forward reference,
14828 fill in the contents in the same object that used to be the
14829 forward reference. */
14831 enumtype
= lookup_and_check_tag (enum_type
, name
,
14832 /*tag_scope=*/ts_current
,
14833 /*template_header_p=*/false);
14835 /* In case of a template_decl, the only check that should be deferred
14836 to instantiation time is the comparison of underlying types. */
14837 if (enumtype
&& TREE_CODE (enumtype
) == ENUMERAL_TYPE
)
14839 if (scoped_enum_p
!= SCOPED_ENUM_P (enumtype
))
14841 error_at (input_location
, "scoped/unscoped mismatch "
14842 "in enum %q#T", enumtype
);
14843 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype
)),
14844 "previous definition here");
14845 enumtype
= error_mark_node
;
14847 else if (ENUM_FIXED_UNDERLYING_TYPE_P (enumtype
) != !! underlying_type
)
14849 error_at (input_location
, "underlying type mismatch "
14850 "in enum %q#T", enumtype
);
14851 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype
)),
14852 "previous definition here");
14853 enumtype
= error_mark_node
;
14855 else if (underlying_type
&& ENUM_UNDERLYING_TYPE (enumtype
)
14856 && !same_type_p (underlying_type
,
14857 ENUM_UNDERLYING_TYPE (enumtype
)))
14859 error_at (input_location
, "different underlying type "
14860 "in enum %q#T", enumtype
);
14861 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype
)),
14862 "previous definition here");
14863 underlying_type
= NULL_TREE
;
14867 if (!enumtype
|| TREE_CODE (enumtype
) != ENUMERAL_TYPE
14868 || processing_template_decl
)
14870 /* In case of error, make a dummy enum to allow parsing to
14872 if (enumtype
== error_mark_node
)
14874 name
= make_anon_name ();
14875 enumtype
= NULL_TREE
;
14878 /* enumtype may be an ENUMERAL_TYPE if this is a redefinition
14879 of an opaque enum, or an opaque enum of an already defined
14880 enumeration (C++11).
14881 In any other case, it'll be NULL_TREE. */
14887 prevtype
= enumtype
;
14889 /* Do not push the decl more than once. */
14891 || TREE_CODE (enumtype
) != ENUMERAL_TYPE
)
14893 enumtype
= cxx_make_type (ENUMERAL_TYPE
);
14894 enumtype
= pushtag (name
, enumtype
, /*tag_scope=*/ts_current
);
14896 /* std::byte aliases anything. */
14897 if (enumtype
!= error_mark_node
14898 && TYPE_CONTEXT (enumtype
) == std_node
14899 && !strcmp ("byte", TYPE_NAME_STRING (enumtype
)))
14900 TYPE_ALIAS_SET (enumtype
) = 0;
14903 enumtype
= xref_tag (enum_type
, name
, /*tag_scope=*/ts_current
,
14906 if (enumtype
== error_mark_node
)
14907 return error_mark_node
;
14909 /* The enum is considered opaque until the opening '{' of the
14910 enumerator list. */
14911 SET_OPAQUE_ENUM_P (enumtype
, true);
14912 ENUM_FIXED_UNDERLYING_TYPE_P (enumtype
) = !! underlying_type
;
14915 SET_SCOPED_ENUM_P (enumtype
, scoped_enum_p
);
14917 cplus_decl_attributes (&enumtype
, attributes
, (int)ATTR_FLAG_TYPE_IN_PLACE
);
14919 if (underlying_type
)
14921 if (ENUM_UNDERLYING_TYPE (enumtype
))
14922 /* We already checked that it matches, don't change it to a different
14923 typedef variant. */;
14924 else if (CP_INTEGRAL_TYPE_P (underlying_type
))
14926 copy_type_enum (enumtype
, underlying_type
);
14927 ENUM_UNDERLYING_TYPE (enumtype
) = underlying_type
;
14929 else if (dependent_type_p (underlying_type
))
14930 ENUM_UNDERLYING_TYPE (enumtype
) = underlying_type
;
14932 error ("underlying type %qT of %qT must be an integral type",
14933 underlying_type
, enumtype
);
14936 /* If into a template class, the returned enum is always the first
14937 declaration (opaque or not) seen. This way all the references to
14938 this type will be to the same declaration. The following ones are used
14939 only to check for definition errors. */
14940 if (prevtype
&& processing_template_decl
)
14946 /* After processing and defining all the values of an enumeration type,
14947 install their decls in the enumeration type.
14948 ENUMTYPE is the type object. */
14951 finish_enum_value_list (tree enumtype
)
14954 tree underlying_type
;
14957 tree minnode
, maxnode
;
14960 bool fixed_underlying_type_p
14961 = ENUM_UNDERLYING_TYPE (enumtype
) != NULL_TREE
;
14963 /* We built up the VALUES in reverse order. */
14964 TYPE_VALUES (enumtype
) = nreverse (TYPE_VALUES (enumtype
));
14966 /* For an enum defined in a template, just set the type of the values;
14967 all further processing is postponed until the template is
14968 instantiated. We need to set the type so that tsubst of a CONST_DECL
14970 if (processing_template_decl
)
14972 for (values
= TYPE_VALUES (enumtype
);
14974 values
= TREE_CHAIN (values
))
14975 TREE_TYPE (TREE_VALUE (values
)) = enumtype
;
14979 /* Determine the minimum and maximum values of the enumerators. */
14980 if (TYPE_VALUES (enumtype
))
14982 minnode
= maxnode
= NULL_TREE
;
14984 for (values
= TYPE_VALUES (enumtype
);
14986 values
= TREE_CHAIN (values
))
14988 decl
= TREE_VALUE (values
);
14990 /* [dcl.enum]: Following the closing brace of an enum-specifier,
14991 each enumerator has the type of its enumeration. Prior to the
14992 closing brace, the type of each enumerator is the type of its
14993 initializing value. */
14994 TREE_TYPE (decl
) = enumtype
;
14996 /* Update the minimum and maximum values, if appropriate. */
14997 value
= DECL_INITIAL (decl
);
14998 if (value
== error_mark_node
)
14999 value
= integer_zero_node
;
15000 /* Figure out what the minimum and maximum values of the
15001 enumerators are. */
15003 minnode
= maxnode
= value
;
15004 else if (tree_int_cst_lt (maxnode
, value
))
15006 else if (tree_int_cst_lt (value
, minnode
))
15013 If the enumerator-list is empty, the underlying type is as if
15014 the enumeration had a single enumerator with value 0. */
15015 minnode
= maxnode
= integer_zero_node
;
15017 if (!fixed_underlying_type_p
)
15019 /* Compute the number of bits require to represent all values of the
15020 enumeration. We must do this before the type of MINNODE and
15021 MAXNODE are transformed, since tree_int_cst_min_precision relies
15022 on the TREE_TYPE of the value it is passed. */
15023 signop sgn
= tree_int_cst_sgn (minnode
) >= 0 ? UNSIGNED
: SIGNED
;
15024 int lowprec
= tree_int_cst_min_precision (minnode
, sgn
);
15025 int highprec
= tree_int_cst_min_precision (maxnode
, sgn
);
15026 int precision
= MAX (lowprec
, highprec
);
15028 bool use_short_enum
;
15030 /* Determine the underlying type of the enumeration.
15034 The underlying type of an enumeration is an integral type that
15035 can represent all the enumerator values defined in the
15036 enumeration. It is implementation-defined which integral type is
15037 used as the underlying type for an enumeration except that the
15038 underlying type shall not be larger than int unless the value of
15039 an enumerator cannot fit in an int or unsigned int.
15041 We use "int" or an "unsigned int" as the underlying type, even if
15042 a smaller integral type would work, unless the user has
15043 explicitly requested that we use the smallest possible type. The
15044 user can request that for all enumerations with a command line
15045 flag, or for just one enumeration with an attribute. */
15047 use_short_enum
= flag_short_enums
15048 || lookup_attribute ("packed", TYPE_ATTRIBUTES (enumtype
));
15050 /* If the precision of the type was specified with an attribute and it
15051 was too small, give an error. Otherwise, use it. */
15052 if (TYPE_PRECISION (enumtype
))
15054 if (precision
> TYPE_PRECISION (enumtype
))
15055 error ("specified mode too small for enumerated values");
15058 use_short_enum
= true;
15059 precision
= TYPE_PRECISION (enumtype
);
15063 for (itk
= (use_short_enum
? itk_char
: itk_int
);
15067 underlying_type
= integer_types
[itk
];
15068 if (underlying_type
!= NULL_TREE
15069 && TYPE_PRECISION (underlying_type
) >= precision
15070 && TYPE_SIGN (underlying_type
) == sgn
)
15073 if (itk
== itk_none
)
15077 IF no integral type can represent all the enumerator values, the
15078 enumeration is ill-formed. */
15079 error ("no integral type can represent all of the enumerator values "
15080 "for %qT", enumtype
);
15081 precision
= TYPE_PRECISION (long_long_integer_type_node
);
15082 underlying_type
= integer_types
[itk_unsigned_long_long
];
15087 The value of sizeof() applied to an enumeration type, an object
15088 of an enumeration type, or an enumerator, is the value of sizeof()
15089 applied to the underlying type. */
15090 copy_type_enum (enumtype
, underlying_type
);
15092 /* Compute the minimum and maximum values for the type.
15096 For an enumeration where emin is the smallest enumerator and emax
15097 is the largest, the values of the enumeration are the values of the
15098 underlying type in the range bmin to bmax, where bmin and bmax are,
15099 respectively, the smallest and largest values of the smallest bit-
15100 field that can store emin and emax. */
15102 /* The middle-end currently assumes that types with TYPE_PRECISION
15103 narrower than their underlying type are suitably zero or sign
15104 extended to fill their mode. Similarly, it assumes that the front
15105 end assures that a value of a particular type must be within
15106 TYPE_MIN_VALUE and TYPE_MAX_VALUE.
15108 We used to set these fields based on bmin and bmax, but that led
15109 to invalid assumptions like optimizing away bounds checking. So
15110 now we just set the TYPE_PRECISION, TYPE_MIN_VALUE, and
15111 TYPE_MAX_VALUE to the values for the mode above and only restrict
15112 the ENUM_UNDERLYING_TYPE for the benefit of diagnostics. */
15113 ENUM_UNDERLYING_TYPE (enumtype
)
15114 = build_distinct_type_copy (underlying_type
);
15115 TYPE_PRECISION (ENUM_UNDERLYING_TYPE (enumtype
)) = precision
;
15116 set_min_and_max_values_for_integral_type
15117 (ENUM_UNDERLYING_TYPE (enumtype
), precision
, sgn
);
15119 /* If -fstrict-enums, still constrain TYPE_MIN/MAX_VALUE. */
15120 if (flag_strict_enums
)
15121 set_min_and_max_values_for_integral_type (enumtype
, precision
, sgn
);
15124 underlying_type
= ENUM_UNDERLYING_TYPE (enumtype
);
15126 /* Convert each of the enumerators to the type of the underlying
15127 type of the enumeration. */
15128 for (values
= TYPE_VALUES (enumtype
); values
; values
= TREE_CHAIN (values
))
15130 decl
= TREE_VALUE (values
);
15131 iloc_sentinel
ils (DECL_SOURCE_LOCATION (decl
));
15132 if (fixed_underlying_type_p
)
15133 /* If the enumeration type has a fixed underlying type, we
15134 already checked all of the enumerator values. */
15135 value
= DECL_INITIAL (decl
);
15137 value
= perform_implicit_conversion (underlying_type
,
15138 DECL_INITIAL (decl
),
15139 tf_warning_or_error
);
15140 /* Do not clobber shared ints. */
15141 if (value
!= error_mark_node
)
15143 value
= copy_node (value
);
15145 TREE_TYPE (value
) = enumtype
;
15147 DECL_INITIAL (decl
) = value
;
15150 /* Fix up all variant types of this enum type. */
15151 for (t
= TYPE_MAIN_VARIANT (enumtype
); t
; t
= TYPE_NEXT_VARIANT (t
))
15152 TYPE_VALUES (t
) = TYPE_VALUES (enumtype
);
15154 if (at_class_scope_p ()
15155 && COMPLETE_TYPE_P (current_class_type
)
15156 && UNSCOPED_ENUM_P (enumtype
))
15158 insert_late_enum_def_bindings (current_class_type
, enumtype
);
15159 /* TYPE_FIELDS needs fixup. */
15160 fixup_type_variants (current_class_type
);
15163 /* Finish debugging output for this type. */
15164 rest_of_type_compilation (enumtype
, namespace_bindings_p ());
15166 /* Each enumerator now has the type of its enumeration. Clear the cache
15167 so that this change in types doesn't confuse us later on. */
15168 clear_cv_and_fold_caches ();
15171 /* Finishes the enum type. This is called only the first time an
15172 enumeration is seen, be it opaque or odinary.
15173 ENUMTYPE is the type object. */
15176 finish_enum (tree enumtype
)
15178 if (processing_template_decl
)
15180 if (at_function_scope_p ())
15181 add_stmt (build_min (TAG_DEFN
, enumtype
));
15185 /* If this is a forward declaration, there should not be any variants,
15186 though we can get a variant in the middle of an enum-specifier with
15187 wacky code like 'enum E { e = sizeof(const E*) };' */
15188 gcc_assert (enumtype
== TYPE_MAIN_VARIANT (enumtype
)
15189 && (TYPE_VALUES (enumtype
)
15190 || !TYPE_NEXT_VARIANT (enumtype
)));
15193 /* Build and install a CONST_DECL for an enumeration constant of the
15194 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
15195 Apply ATTRIBUTES if available. LOC is the location of NAME.
15196 Assignment of sequential values by default is handled here. */
15199 build_enumerator (tree name
, tree value
, tree enumtype
, tree attributes
,
15206 /* scalar_constant_value will pull out this expression, so make sure
15207 it's folded as appropriate. */
15208 if (processing_template_decl
)
15209 value
= fold_non_dependent_expr (value
);
15211 /* If the VALUE was erroneous, pretend it wasn't there; that will
15212 result in the enum being assigned the next value in sequence. */
15213 if (value
== error_mark_node
)
15216 /* Remove no-op casts from the value. */
15218 STRIP_TYPE_NOPS (value
);
15220 if (! processing_template_decl
)
15222 /* Validate and default VALUE. */
15223 if (value
!= NULL_TREE
)
15225 if (!ENUM_UNDERLYING_TYPE (enumtype
))
15227 tree tmp_value
= build_expr_type_conversion (WANT_INT
| WANT_ENUM
,
15232 else if (! INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P
15233 (TREE_TYPE (value
)))
15234 value
= perform_implicit_conversion_flags
15235 (ENUM_UNDERLYING_TYPE (enumtype
), value
, tf_warning_or_error
,
15236 LOOKUP_IMPLICIT
| LOOKUP_NO_NARROWING
);
15238 if (value
== error_mark_node
)
15241 if (value
!= NULL_TREE
)
15243 if (! INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P
15244 (TREE_TYPE (value
)))
15246 error_at (cp_expr_loc_or_input_loc (value
),
15247 "enumerator value for %qD must have integral or "
15248 "unscoped enumeration type", name
);
15253 value
= cxx_constant_value (value
);
15255 if (TREE_CODE (value
) != INTEGER_CST
)
15257 error ("enumerator value for %qD is not an integer "
15265 /* Default based on previous value. */
15266 if (value
== NULL_TREE
)
15268 if (TYPE_VALUES (enumtype
))
15272 /* C++03 7.2/4: If no initializer is specified for the first
15273 enumerator, the type is an unspecified integral
15274 type. Otherwise the type is the same as the type of the
15275 initializing value of the preceding enumerator unless the
15276 incremented value is not representable in that type, in
15277 which case the type is an unspecified integral type
15278 sufficient to contain the incremented value. */
15279 prev_value
= DECL_INITIAL (TREE_VALUE (TYPE_VALUES (enumtype
)));
15280 if (error_operand_p (prev_value
))
15281 value
= error_mark_node
;
15284 wi::overflow_type overflowed
;
15285 tree type
= TREE_TYPE (prev_value
);
15286 signop sgn
= TYPE_SIGN (type
);
15287 widest_int wi
= wi::add (wi::to_widest (prev_value
), 1, sgn
,
15291 bool pos
= !wi::neg_p (wi
, sgn
);
15292 if (!wi::fits_to_tree_p (wi
, type
))
15295 for (itk
= itk_int
; itk
!= itk_none
; itk
++)
15297 type
= integer_types
[itk
];
15298 if (type
!= NULL_TREE
15299 && (pos
|| !TYPE_UNSIGNED (type
))
15300 && wi::fits_to_tree_p (wi
, type
))
15303 if (type
&& cxx_dialect
< cxx11
15304 && itk
> itk_unsigned_long
)
15305 pedwarn (input_location
, OPT_Wlong_long
,
15307 incremented enumerator value is too large for %<unsigned long%>") : G_("\
15308 incremented enumerator value is too large for %<long%>"));
15310 if (type
== NULL_TREE
)
15311 overflowed
= wi::OVF_UNKNOWN
;
15313 value
= wide_int_to_tree (type
, wi
);
15318 error ("overflow in enumeration values at %qD", name
);
15319 value
= error_mark_node
;
15324 value
= integer_zero_node
;
15327 /* Remove no-op casts from the value. */
15328 STRIP_TYPE_NOPS (value
);
15330 /* If the underlying type of the enum is fixed, check whether
15331 the enumerator values fits in the underlying type. If it
15332 does not fit, the program is ill-formed [C++0x dcl.enum]. */
15333 if (ENUM_UNDERLYING_TYPE (enumtype
)
15335 && TREE_CODE (value
) == INTEGER_CST
)
15337 if (!int_fits_type_p (value
, ENUM_UNDERLYING_TYPE (enumtype
)))
15338 error ("enumerator value %qE is outside the range of underlying "
15339 "type %qT", value
, ENUM_UNDERLYING_TYPE (enumtype
));
15341 /* Convert the value to the appropriate type. */
15342 value
= fold_convert (ENUM_UNDERLYING_TYPE (enumtype
), value
);
15346 /* C++ associates enums with global, function, or class declarations. */
15347 context
= current_scope ();
15349 /* Build the actual enumeration constant. Note that the enumeration
15350 constants have the underlying type of the enum (if it is fixed)
15351 or the type of their initializer (if the underlying type of the
15352 enum is not fixed):
15356 If the underlying type is fixed, the type of each enumerator
15357 prior to the closing brace is the underlying type; if the
15358 initializing value of an enumerator cannot be represented by
15359 the underlying type, the program is ill-formed. If the
15360 underlying type is not fixed, the type of each enumerator is
15361 the type of its initializing value.
15363 If the underlying type is not fixed, it will be computed by
15364 finish_enum and we will reset the type of this enumerator. Of
15365 course, if we're processing a template, there may be no value. */
15366 type
= value
? TREE_TYPE (value
) : NULL_TREE
;
15368 decl
= build_decl (loc
, CONST_DECL
, name
, type
);
15370 DECL_CONTEXT (decl
) = enumtype
;
15371 TREE_CONSTANT (decl
) = 1;
15372 TREE_READONLY (decl
) = 1;
15373 DECL_INITIAL (decl
) = value
;
15376 cplus_decl_attributes (&decl
, attributes
, 0);
15378 if (context
&& context
== current_class_type
&& !SCOPED_ENUM_P (enumtype
))
15380 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
15381 on the TYPE_FIELDS list for `S'. (That's so that you can say
15382 things like `S::i' later.) */
15384 /* The enumerator may be getting declared outside of its enclosing
15387 class S { public: enum E : int; }; enum S::E : int { i = 7; };
15389 For which case we need to make sure that the access of `S::i'
15390 matches the access of `S::E'. */
15391 tree saved_cas
= current_access_specifier
;
15392 if (TREE_PRIVATE (TYPE_NAME (enumtype
)))
15393 current_access_specifier
= access_private_node
;
15394 else if (TREE_PROTECTED (TYPE_NAME (enumtype
)))
15395 current_access_specifier
= access_protected_node
;
15397 current_access_specifier
= access_public_node
;
15399 finish_member_declaration (decl
);
15401 current_access_specifier
= saved_cas
;
15406 /* Add this enumeration constant to the list for this type. */
15407 TYPE_VALUES (enumtype
) = tree_cons (name
, decl
, TYPE_VALUES (enumtype
));
15410 /* Look for an enumerator with the given NAME within the enumeration
15411 type ENUMTYPE. This routine is used primarily for qualified name
15412 lookup into an enumerator in C++0x, e.g.,
15414 enum class Color { Red, Green, Blue };
15416 Color color = Color::Red;
15418 Returns the value corresponding to the enumerator, or
15419 NULL_TREE if no such enumerator was found. */
15421 lookup_enumerator (tree enumtype
, tree name
)
15424 gcc_assert (enumtype
&& TREE_CODE (enumtype
) == ENUMERAL_TYPE
);
15426 e
= purpose_member (name
, TYPE_VALUES (enumtype
));
15427 return e
? TREE_VALUE (e
) : NULL_TREE
;
15431 /* We're defining DECL. Make sure that its type is OK. */
15434 check_function_type (tree decl
, tree current_function_parms
)
15436 tree fntype
= TREE_TYPE (decl
);
15437 tree return_type
= complete_type (TREE_TYPE (fntype
));
15439 /* In a function definition, arg types must be complete. */
15440 require_complete_types_for_parms (current_function_parms
);
15442 if (dependent_type_p (return_type
)
15443 || type_uses_auto (return_type
))
15445 if (!COMPLETE_OR_VOID_TYPE_P (return_type
))
15447 tree args
= TYPE_ARG_TYPES (fntype
);
15449 error ("return type %q#T is incomplete", return_type
);
15451 /* Make it return void instead. */
15452 if (TREE_CODE (fntype
) == METHOD_TYPE
)
15453 fntype
= build_method_type_directly (TREE_TYPE (TREE_VALUE (args
)),
15455 TREE_CHAIN (args
));
15457 fntype
= build_function_type (void_type_node
, args
);
15458 fntype
= (cp_build_type_attribute_variant
15459 (fntype
, TYPE_ATTRIBUTES (TREE_TYPE (decl
))));
15460 fntype
= cxx_copy_lang_qualifiers (fntype
, TREE_TYPE (decl
));
15461 TREE_TYPE (decl
) = fntype
;
15465 abstract_virtuals_error (decl
, TREE_TYPE (fntype
));
15466 maybe_warn_parm_abi (TREE_TYPE (fntype
),
15467 DECL_SOURCE_LOCATION (decl
));
15471 /* True iff FN is an implicitly-defined default constructor. */
15474 implicit_default_ctor_p (tree fn
)
15476 return (DECL_CONSTRUCTOR_P (fn
)
15477 && !user_provided_p (fn
)
15478 && sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (fn
)));
15481 /* Clobber the contents of *this to let the back end know that the object
15482 storage is dead when we enter the constructor or leave the destructor. */
15485 build_clobber_this ()
15487 /* Clobbering an empty base is pointless, and harmful if its one byte
15488 TYPE_SIZE overlays real data. */
15489 if (is_empty_class (current_class_type
))
15492 /* If we have virtual bases, clobber the whole object, but only if we're in
15493 charge. If we don't have virtual bases, clobber the as-base type so we
15494 don't mess with tail padding. */
15495 bool vbases
= CLASSTYPE_VBASECLASSES (current_class_type
);
15497 tree ctype
= current_class_type
;
15499 ctype
= CLASSTYPE_AS_BASE (ctype
);
15501 tree clobber
= build_clobber (ctype
);
15503 tree thisref
= current_class_ref
;
15504 if (ctype
!= current_class_type
)
15506 thisref
= build_nop (build_reference_type (ctype
), current_class_ptr
);
15507 thisref
= convert_from_reference (thisref
);
15510 tree exprstmt
= build2 (MODIFY_EXPR
, void_type_node
, thisref
, clobber
);
15512 exprstmt
= build_if_in_charge (exprstmt
);
15517 /* Create the FUNCTION_DECL for a function definition.
15518 DECLSPECS and DECLARATOR are the parts of the declaration;
15519 they describe the function's name and the type it returns,
15520 but twisted together in a fashion that parallels the syntax of C.
15522 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
15523 DECLARATOR is really the DECL for the function we are about to
15524 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
15525 indicating that the function is an inline defined in-class.
15527 This function creates a binding context for the function body
15528 as well as setting up the FUNCTION_DECL in current_function_decl.
15530 For C++, we must first check whether that datum makes any sense.
15531 For example, "class A local_a(1,2);" means that variable local_a
15532 is an aggregate of type A, which should have a constructor
15533 applied to it with the argument list [1, 2].
15535 On entry, DECL_INITIAL (decl1) should be NULL_TREE or error_mark_node,
15536 or may be a BLOCK if the function has been defined previously
15537 in this translation unit. On exit, DECL_INITIAL (decl1) will be
15538 error_mark_node if the function has never been defined, or
15539 a BLOCK if the function has been defined somewhere. */
15542 start_preparsed_function (tree decl1
, tree attrs
, int flags
)
15544 tree ctype
= NULL_TREE
;
15547 int doing_friend
= 0;
15548 cp_binding_level
*bl
;
15549 tree current_function_parms
;
15550 struct c_fileinfo
*finfo
15551 = get_fileinfo (LOCATION_FILE (DECL_SOURCE_LOCATION (decl1
)));
15552 bool honor_interface
;
15554 /* Sanity check. */
15555 gcc_assert (VOID_TYPE_P (TREE_VALUE (void_list_node
)));
15556 gcc_assert (TREE_CHAIN (void_list_node
) == NULL_TREE
);
15558 fntype
= TREE_TYPE (decl1
);
15559 if (TREE_CODE (fntype
) == METHOD_TYPE
)
15560 ctype
= TYPE_METHOD_BASETYPE (fntype
);
15562 /* ISO C++ 11.4/5. A friend function defined in a class is in
15563 the (lexical) scope of the class in which it is defined. */
15564 if (!ctype
&& DECL_FRIEND_P (decl1
))
15566 ctype
= DECL_FRIEND_CONTEXT (decl1
);
15568 /* CTYPE could be null here if we're dealing with a template;
15569 for example, `inline friend float foo()' inside a template
15570 will have no CTYPE set. */
15571 if (ctype
&& TREE_CODE (ctype
) != RECORD_TYPE
)
15577 if (DECL_DECLARED_INLINE_P (decl1
)
15578 && lookup_attribute ("noinline", attrs
))
15579 warning_at (DECL_SOURCE_LOCATION (decl1
), 0,
15580 "inline function %qD given attribute %qs", decl1
, "noinline");
15582 /* Handle gnu_inline attribute. */
15583 if (GNU_INLINE_P (decl1
))
15585 DECL_EXTERNAL (decl1
) = 1;
15586 DECL_NOT_REALLY_EXTERN (decl1
) = 0;
15587 DECL_INTERFACE_KNOWN (decl1
) = 1;
15588 DECL_DISREGARD_INLINE_LIMITS (decl1
) = 1;
15591 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl1
))
15592 /* This is a constructor, we must ensure that any default args
15593 introduced by this definition are propagated to the clones
15594 now. The clones are used directly in overload resolution. */
15595 adjust_clone_args (decl1
);
15597 /* Sometimes we don't notice that a function is a static member, and
15598 build a METHOD_TYPE for it. Fix that up now. */
15599 gcc_assert (!(ctype
!= NULL_TREE
&& DECL_STATIC_FUNCTION_P (decl1
)
15600 && TREE_CODE (TREE_TYPE (decl1
)) == METHOD_TYPE
));
15602 /* Set up current_class_type, and enter the scope of the class, if
15605 push_nested_class (ctype
);
15606 else if (DECL_STATIC_FUNCTION_P (decl1
))
15607 push_nested_class (DECL_CONTEXT (decl1
));
15609 /* Now that we have entered the scope of the class, we must restore
15610 the bindings for any template parameters surrounding DECL1, if it
15611 is an inline member template. (Order is important; consider the
15612 case where a template parameter has the same name as a field of
15613 the class.) It is not until after this point that
15614 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
15615 if (flags
& SF_INCLASS_INLINE
)
15616 maybe_begin_member_template_processing (decl1
);
15618 /* Effective C++ rule 15. */
15620 && DECL_ASSIGNMENT_OPERATOR_P (decl1
)
15621 && DECL_OVERLOADED_OPERATOR_IS (decl1
, NOP_EXPR
)
15622 && VOID_TYPE_P (TREE_TYPE (fntype
)))
15623 warning (OPT_Weffc__
,
15624 "%<operator=%> should return a reference to %<*this%>");
15626 /* Make the init_value nonzero so pushdecl knows this is not tentative.
15627 error_mark_node is replaced below (in poplevel) with the BLOCK. */
15628 if (!DECL_INITIAL (decl1
))
15629 DECL_INITIAL (decl1
) = error_mark_node
;
15631 /* This function exists in static storage.
15632 (This does not mean `static' in the C sense!) */
15633 TREE_STATIC (decl1
) = 1;
15635 /* We must call push_template_decl after current_class_type is set
15636 up. (If we are processing inline definitions after exiting a
15637 class scope, current_class_type will be NULL_TREE until set above
15638 by push_nested_class.) */
15639 if (processing_template_decl
)
15641 tree newdecl1
= push_template_decl (decl1
);
15642 if (newdecl1
== error_mark_node
)
15644 if (ctype
|| DECL_STATIC_FUNCTION_P (decl1
))
15645 pop_nested_class ();
15651 /* Make sure the parameter and return types are reasonable. When
15652 you declare a function, these types can be incomplete, but they
15653 must be complete when you define the function. */
15654 check_function_type (decl1
, DECL_ARGUMENTS (decl1
));
15656 /* Build the return declaration for the function. */
15657 restype
= TREE_TYPE (fntype
);
15659 if (DECL_RESULT (decl1
) == NULL_TREE
)
15663 resdecl
= build_decl (input_location
, RESULT_DECL
, 0, restype
);
15664 DECL_ARTIFICIAL (resdecl
) = 1;
15665 DECL_IGNORED_P (resdecl
) = 1;
15666 DECL_RESULT (decl1
) = resdecl
;
15668 cp_apply_type_quals_to_decl (cp_type_quals (restype
), resdecl
);
15671 /* Record the decl so that the function name is defined.
15672 If we already have a decl for this name, and it is a FUNCTION_DECL,
15673 use the old decl. */
15674 if (!processing_template_decl
&& !(flags
& SF_PRE_PARSED
))
15676 /* A specialization is not used to guide overload resolution. */
15677 if (!DECL_FUNCTION_MEMBER_P (decl1
)
15678 && !(DECL_USE_TEMPLATE (decl1
) &&
15679 PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl1
))))
15681 tree olddecl
= pushdecl (decl1
);
15683 if (olddecl
== error_mark_node
)
15684 /* If something went wrong when registering the declaration,
15685 use DECL1; we have to have a FUNCTION_DECL to use when
15686 parsing the body of the function. */
15690 /* Otherwise, OLDDECL is either a previous declaration
15691 of the same function or DECL1 itself. */
15693 if (warn_missing_declarations
15694 && olddecl
== decl1
15695 && !DECL_MAIN_P (decl1
)
15696 && TREE_PUBLIC (decl1
)
15697 && !DECL_DECLARED_INLINE_P (decl1
))
15701 /* Check whether DECL1 is in an anonymous
15703 for (context
= DECL_CONTEXT (decl1
);
15705 context
= DECL_CONTEXT (context
))
15707 if (TREE_CODE (context
) == NAMESPACE_DECL
15708 && DECL_NAME (context
) == NULL_TREE
)
15712 if (context
== NULL
)
15713 warning_at (DECL_SOURCE_LOCATION (decl1
),
15714 OPT_Wmissing_declarations
,
15715 "no previous declaration for %qD", decl1
);
15723 /* We need to set the DECL_CONTEXT. */
15724 if (!DECL_CONTEXT (decl1
) && DECL_TEMPLATE_INFO (decl1
))
15725 DECL_CONTEXT (decl1
) = DECL_CONTEXT (DECL_TI_TEMPLATE (decl1
));
15727 fntype
= TREE_TYPE (decl1
);
15728 restype
= TREE_TYPE (fntype
);
15730 /* If #pragma weak applies, mark the decl appropriately now.
15731 The pragma only applies to global functions. Because
15732 determining whether or not the #pragma applies involves
15733 computing the mangled name for the declaration, we cannot
15734 apply the pragma until after we have merged this declaration
15735 with any previous declarations; if the original declaration
15736 has a linkage specification, that specification applies to
15737 the definition as well, and may affect the mangled name. */
15738 if (DECL_FILE_SCOPE_P (decl1
))
15739 maybe_apply_pragma_weak (decl1
);
15742 /* We are now in the scope of the function being defined. */
15743 current_function_decl
= decl1
;
15745 /* Save the parm names or decls from this function's declarator
15746 where store_parm_decls will find them. */
15747 current_function_parms
= DECL_ARGUMENTS (decl1
);
15749 /* Let the user know we're compiling this function. */
15750 announce_function (decl1
);
15752 gcc_assert (DECL_INITIAL (decl1
));
15754 /* This function may already have been parsed, in which case just
15755 return; our caller will skip over the body without parsing. */
15756 if (DECL_INITIAL (decl1
) != error_mark_node
)
15759 /* Initialize RTL machinery. We cannot do this until
15760 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
15761 even when processing a template; this is how we get
15762 CFUN set up, and our per-function variables initialized.
15763 FIXME factor out the non-RTL stuff. */
15764 bl
= current_binding_level
;
15765 allocate_struct_function (decl1
, processing_template_decl
);
15767 /* Initialize the language data structures. Whenever we start
15768 a new function, we destroy temporaries in the usual way. */
15769 cfun
->language
= ggc_cleared_alloc
<language_function
> ();
15770 current_stmt_tree ()->stmts_are_full_exprs_p
= 1;
15771 current_binding_level
= bl
;
15773 /* If we are (erroneously) defining a function that we have already
15774 defined before, wipe out what we knew before. */
15775 gcc_checking_assert (!DECL_PENDING_INLINE_P (decl1
));
15776 FNDECL_USED_AUTO (decl1
) = false;
15777 DECL_SAVED_AUTO_RETURN_TYPE (decl1
) = NULL
;
15779 if (!processing_template_decl
&& type_uses_auto (restype
))
15781 FNDECL_USED_AUTO (decl1
) = true;
15782 DECL_SAVED_AUTO_RETURN_TYPE (decl1
) = restype
;
15785 /* Start the statement-tree, start the tree now. */
15786 DECL_SAVED_TREE (decl1
) = push_stmt_list ();
15788 if (ctype
&& !doing_friend
&& !DECL_STATIC_FUNCTION_P (decl1
))
15790 /* We know that this was set up by `grokclassfn'. We do not
15791 wait until `store_parm_decls', since evil parse errors may
15792 never get us to that point. Here we keep the consistency
15793 between `current_class_type' and `current_class_ptr'. */
15794 tree t
= DECL_ARGUMENTS (decl1
);
15796 gcc_assert (t
!= NULL_TREE
&& TREE_CODE (t
) == PARM_DECL
);
15797 gcc_assert (TYPE_PTR_P (TREE_TYPE (t
)));
15799 cp_function_chain
->x_current_class_ref
15800 = cp_build_fold_indirect_ref (t
);
15801 /* Set this second to avoid shortcut in cp_build_indirect_ref. */
15802 cp_function_chain
->x_current_class_ptr
= t
;
15804 /* Constructors and destructors need to know whether they're "in
15805 charge" of initializing virtual base classes. */
15806 t
= DECL_CHAIN (t
);
15807 if (DECL_HAS_IN_CHARGE_PARM_P (decl1
))
15809 current_in_charge_parm
= t
;
15810 t
= DECL_CHAIN (t
);
15812 if (DECL_HAS_VTT_PARM_P (decl1
))
15814 gcc_assert (DECL_NAME (t
) == vtt_parm_identifier
);
15815 current_vtt_parm
= t
;
15819 honor_interface
= (!DECL_TEMPLATE_INSTANTIATION (decl1
)
15820 /* Implicitly-defined methods (like the
15821 destructor for a class in which no destructor
15822 is explicitly declared) must not be defined
15823 until their definition is needed. So, we
15824 ignore interface specifications for
15825 compiler-generated functions. */
15826 && !DECL_ARTIFICIAL (decl1
));
15828 if (processing_template_decl
)
15829 /* Don't mess with interface flags. */;
15830 else if (DECL_INTERFACE_KNOWN (decl1
))
15832 tree ctx
= decl_function_context (decl1
);
15834 if (DECL_NOT_REALLY_EXTERN (decl1
))
15835 DECL_EXTERNAL (decl1
) = 0;
15837 if (ctx
!= NULL_TREE
&& vague_linkage_p (ctx
))
15838 /* This is a function in a local class in an extern inline
15839 or template function. */
15840 comdat_linkage (decl1
);
15842 /* If this function belongs to an interface, it is public.
15843 If it belongs to someone else's interface, it is also external.
15844 This only affects inlines and template instantiations. */
15845 else if (!finfo
->interface_unknown
&& honor_interface
)
15847 if (DECL_DECLARED_INLINE_P (decl1
)
15848 || DECL_TEMPLATE_INSTANTIATION (decl1
))
15850 DECL_EXTERNAL (decl1
)
15851 = (finfo
->interface_only
15852 || (DECL_DECLARED_INLINE_P (decl1
)
15853 && ! flag_implement_inlines
15854 && !DECL_VINDEX (decl1
)));
15856 /* For WIN32 we also want to put these in linkonce sections. */
15857 maybe_make_one_only (decl1
);
15860 DECL_EXTERNAL (decl1
) = 0;
15861 DECL_INTERFACE_KNOWN (decl1
) = 1;
15862 /* If this function is in an interface implemented in this file,
15863 make sure that the back end knows to emit this function
15865 if (!DECL_EXTERNAL (decl1
))
15866 mark_needed (decl1
);
15868 else if (finfo
->interface_unknown
&& finfo
->interface_only
15869 && honor_interface
)
15871 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
15872 interface, we will have both finfo->interface_unknown and
15873 finfo->interface_only set. In that case, we don't want to
15874 use the normal heuristics because someone will supply a
15875 #pragma implementation elsewhere, and deducing it here would
15876 produce a conflict. */
15877 comdat_linkage (decl1
);
15878 DECL_EXTERNAL (decl1
) = 0;
15879 DECL_INTERFACE_KNOWN (decl1
) = 1;
15880 DECL_DEFER_OUTPUT (decl1
) = 1;
15884 /* This is a definition, not a reference.
15885 So clear DECL_EXTERNAL, unless this is a GNU extern inline. */
15886 if (!GNU_INLINE_P (decl1
))
15887 DECL_EXTERNAL (decl1
) = 0;
15889 if ((DECL_DECLARED_INLINE_P (decl1
)
15890 || DECL_TEMPLATE_INSTANTIATION (decl1
))
15891 && ! DECL_INTERFACE_KNOWN (decl1
))
15892 DECL_DEFER_OUTPUT (decl1
) = 1;
15894 DECL_INTERFACE_KNOWN (decl1
) = 1;
15897 /* Determine the ELF visibility attribute for the function. We must not
15898 do this before calling "pushdecl", as we must allow "duplicate_decls"
15899 to merge any attributes appropriately. We also need to wait until
15901 if (!DECL_CLONED_FUNCTION_P (decl1
))
15902 determine_visibility (decl1
);
15904 if (!processing_template_decl
)
15905 maybe_instantiate_noexcept (decl1
);
15907 begin_scope (sk_function_parms
, decl1
);
15911 if (DECL_DESTRUCTOR_P (decl1
)
15912 || (DECL_CONSTRUCTOR_P (decl1
)
15913 && targetm
.cxx
.cdtor_returns_this ()))
15915 cdtor_label
= create_artificial_label (input_location
);
15916 LABEL_DECL_CDTOR (cdtor_label
) = true;
15919 start_fname_decls ();
15921 store_parm_decls (current_function_parms
);
15923 push_operator_bindings ();
15925 if (!processing_template_decl
15926 && (flag_lifetime_dse
> 1)
15927 && DECL_CONSTRUCTOR_P (decl1
)
15928 && !DECL_CLONED_FUNCTION_P (decl1
)
15929 /* Clobbering an empty base is harmful if it overlays real data. */
15930 && !is_empty_class (current_class_type
)
15931 /* We can't clobber safely for an implicitly-defined default constructor
15932 because part of the initialization might happen before we enter the
15933 constructor, via AGGR_INIT_ZERO_FIRST (c++/68006). */
15934 && !implicit_default_ctor_p (decl1
))
15935 finish_expr_stmt (build_clobber_this ());
15937 if (!processing_template_decl
15938 && DECL_CONSTRUCTOR_P (decl1
)
15939 && sanitize_flags_p (SANITIZE_VPTR
)
15940 && !DECL_CLONED_FUNCTION_P (decl1
)
15941 && !implicit_default_ctor_p (decl1
))
15942 cp_ubsan_maybe_initialize_vtbl_ptrs (current_class_ptr
);
15944 start_lambda_scope (decl1
);
15950 /* Like start_preparsed_function, except that instead of a
15951 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
15953 Returns true on success. If the DECLARATOR is not suitable
15954 for a function, we return false, which tells the parser to
15955 skip the entire function. */
15958 start_function (cp_decl_specifier_seq
*declspecs
,
15959 const cp_declarator
*declarator
,
15964 decl1
= grokdeclarator (declarator
, declspecs
, FUNCDEF
, 1, &attrs
);
15965 invoke_plugin_callbacks (PLUGIN_START_PARSE_FUNCTION
, decl1
);
15966 if (decl1
== error_mark_node
)
15969 if (DECL_MAIN_P (decl1
))
15970 /* main must return int. grokfndecl should have corrected it
15971 (and issued a diagnostic) if the user got it wrong. */
15972 gcc_assert (same_type_p (TREE_TYPE (TREE_TYPE (decl1
)),
15973 integer_type_node
));
15975 return start_preparsed_function (decl1
, attrs
, /*flags=*/SF_DEFAULT
);
15978 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
15982 use_eh_spec_block (tree fn
)
15984 return (flag_exceptions
&& flag_enforce_eh_specs
15985 && !processing_template_decl
15986 && !type_throw_all_p (TREE_TYPE (fn
))
15987 /* We insert the EH_SPEC_BLOCK only in the original
15988 function; then, it is copied automatically to the
15990 && !DECL_CLONED_FUNCTION_P (fn
)
15991 /* Implicitly-generated constructors and destructors have
15992 exception specifications. However, those specifications
15993 are the union of the possible exceptions specified by the
15994 constructors/destructors for bases and members, so no
15995 unallowed exception will ever reach this function. By
15996 not creating the EH_SPEC_BLOCK we save a little memory,
15997 and we avoid spurious warnings about unreachable
15999 && !DECL_DEFAULTED_FN (fn
));
16002 /* Helper function to push ARGS into the current lexical scope. DECL
16003 is the function declaration. NONPARMS is used to handle enum
16007 do_push_parm_decls (tree decl
, tree args
, tree
*nonparms
)
16009 /* If we're doing semantic analysis, then we'll call pushdecl
16010 for each of these. We must do them in reverse order so that
16011 they end in the correct forward order. */
16012 args
= nreverse (args
);
16015 for (tree parm
= args
; parm
; parm
= next
)
16017 next
= DECL_CHAIN (parm
);
16018 if (TREE_CODE (parm
) == PARM_DECL
)
16022 /* If we find an enum constant or a type tag, put it aside for
16024 TREE_CHAIN (parm
) = NULL_TREE
;
16025 *nonparms
= chainon (*nonparms
, parm
);
16029 /* Get the decls in their original chain order and record in the
16030 function. This is all and only the PARM_DECLs that were
16031 pushed into scope by the loop above. */
16032 DECL_ARGUMENTS (decl
) = get_local_decls ();
16035 /* Store the parameter declarations into the current function declaration.
16036 This is called after parsing the parameter declarations, before
16037 digesting the body of the function.
16039 Also install to binding contour return value identifier, if any. */
16042 store_parm_decls (tree current_function_parms
)
16044 tree fndecl
= current_function_decl
;
16046 /* This is a chain of any other decls that came in among the parm
16047 declarations. If a parm is declared with enum {foo, bar} x;
16048 then CONST_DECLs for foo and bar are put here. */
16049 tree nonparms
= NULL_TREE
;
16051 if (current_function_parms
)
16053 /* This case is when the function was defined with an ANSI prototype.
16054 The parms already have decls, so we need not do anything here
16055 except record them as in effect
16056 and complain if any redundant old-style parm decls were written. */
16058 tree specparms
= current_function_parms
;
16060 /* Must clear this because it might contain TYPE_DECLs declared
16062 current_binding_level
->names
= NULL
;
16064 do_push_parm_decls (fndecl
, specparms
, &nonparms
);
16067 DECL_ARGUMENTS (fndecl
) = NULL_TREE
;
16069 /* Now store the final chain of decls for the arguments
16070 as the decl-chain of the current lexical scope.
16071 Put the enumerators in as well, at the front so that
16072 DECL_ARGUMENTS is not modified. */
16073 current_binding_level
->names
= chainon (nonparms
, DECL_ARGUMENTS (fndecl
));
16075 if (use_eh_spec_block (current_function_decl
))
16076 current_eh_spec_block
= begin_eh_spec_block ();
16080 /* Set the return value of the constructor (if present). */
16083 finish_constructor_body (void)
16088 if (targetm
.cxx
.cdtor_returns_this ())
16090 /* Any return from a constructor will end up here. */
16091 add_stmt (build_stmt (input_location
, LABEL_EXPR
, cdtor_label
));
16093 val
= DECL_ARGUMENTS (current_function_decl
);
16094 val
= build2 (MODIFY_EXPR
, TREE_TYPE (val
),
16095 DECL_RESULT (current_function_decl
), val
);
16096 /* Return the address of the object. */
16097 exprstmt
= build_stmt (input_location
, RETURN_EXPR
, val
);
16098 add_stmt (exprstmt
);
16102 /* Do all the processing for the beginning of a destructor; set up the
16103 vtable pointers and cleanups for bases and members. */
16106 begin_destructor_body (void)
16108 tree compound_stmt
;
16110 /* If the CURRENT_CLASS_TYPE is incomplete, we will have already
16111 issued an error message. We still want to try to process the
16112 body of the function, but initialize_vtbl_ptrs will crash if
16113 TYPE_BINFO is NULL. */
16114 if (COMPLETE_TYPE_P (current_class_type
))
16116 compound_stmt
= begin_compound_stmt (0);
16117 /* Make all virtual function table pointers in non-virtual base
16118 classes point to CURRENT_CLASS_TYPE's virtual function
16120 initialize_vtbl_ptrs (current_class_ptr
);
16121 finish_compound_stmt (compound_stmt
);
16123 if (flag_lifetime_dse
16124 /* Clobbering an empty base is harmful if it overlays real data. */
16125 && !is_empty_class (current_class_type
))
16127 if (sanitize_flags_p (SANITIZE_VPTR
)
16128 && (flag_sanitize_recover
& SANITIZE_VPTR
) == 0
16129 && TYPE_CONTAINS_VPTR_P (current_class_type
))
16131 tree binfo
= TYPE_BINFO (current_class_type
);
16133 = cp_build_fold_indirect_ref (current_class_ptr
);
16135 tree vtbl_ptr
= build_vfield_ref (ref
, TREE_TYPE (binfo
));
16136 tree vtbl
= build_zero_cst (TREE_TYPE (vtbl_ptr
));
16137 tree stmt
= cp_build_modify_expr (input_location
, vtbl_ptr
,
16139 tf_warning_or_error
);
16140 /* If the vptr is shared with some virtual nearly empty base,
16141 don't clear it if not in charge, the dtor of the virtual
16142 nearly empty base will do that later. */
16143 if (CLASSTYPE_VBASECLASSES (current_class_type
)
16144 && CLASSTYPE_PRIMARY_BINFO (current_class_type
)
16146 (CLASSTYPE_PRIMARY_BINFO (current_class_type
)))
16148 stmt
= convert_to_void (stmt
, ICV_STATEMENT
,
16149 tf_warning_or_error
);
16150 stmt
= build_if_in_charge (stmt
);
16152 finish_decl_cleanup (NULL_TREE
, stmt
);
16155 finish_decl_cleanup (NULL_TREE
, build_clobber_this ());
16158 /* And insert cleanups for our bases and members so that they
16159 will be properly destroyed if we throw. */
16160 push_base_cleanups ();
16164 /* At the end of every destructor we generate code to delete the object if
16165 necessary. Do that now. */
16168 finish_destructor_body (void)
16172 /* Any return from a destructor will end up here; that way all base
16173 and member cleanups will be run when the function returns. */
16174 add_stmt (build_stmt (input_location
, LABEL_EXPR
, cdtor_label
));
16176 if (targetm
.cxx
.cdtor_returns_this ())
16180 val
= DECL_ARGUMENTS (current_function_decl
);
16181 val
= build2 (MODIFY_EXPR
, TREE_TYPE (val
),
16182 DECL_RESULT (current_function_decl
), val
);
16183 /* Return the address of the object. */
16184 exprstmt
= build_stmt (input_location
, RETURN_EXPR
, val
);
16185 add_stmt (exprstmt
);
16189 /* Do the necessary processing for the beginning of a function body, which
16190 in this case includes member-initializers, but not the catch clauses of
16191 a function-try-block. Currently, this means opening a binding level
16192 for the member-initializers (in a ctor), member cleanups (in a dtor),
16193 and capture proxies (in a lambda operator()). */
16196 begin_function_body (void)
16200 if (! FUNCTION_NEEDS_BODY_BLOCK (current_function_decl
))
16203 if (processing_template_decl
)
16204 /* Do nothing now. */;
16206 /* Always keep the BLOCK node associated with the outermost pair of
16207 curly braces of a function. These are needed for correct
16208 operation of dwarfout.c. */
16209 keep_next_level (true);
16211 stmt
= begin_compound_stmt (BCS_FN_BODY
);
16213 if (processing_template_decl
)
16214 /* Do nothing now. */;
16215 else if (DECL_DESTRUCTOR_P (current_function_decl
))
16216 begin_destructor_body ();
16221 /* Do the processing for the end of a function body. Currently, this means
16222 closing out the cleanups for fully-constructed bases and members, and in
16223 the case of the destructor, deleting the object if desired. Again, this
16224 is only meaningful for [cd]tors, since they are the only functions where
16225 there is a significant distinction between the main body and any
16226 function catch clauses. Handling, say, main() return semantics here
16227 would be wrong, as flowing off the end of a function catch clause for
16228 main() would also need to return 0. */
16231 finish_function_body (tree compstmt
)
16233 if (compstmt
== NULL_TREE
)
16236 /* Close the block. */
16237 finish_compound_stmt (compstmt
);
16239 if (processing_template_decl
)
16240 /* Do nothing now. */;
16241 else if (DECL_CONSTRUCTOR_P (current_function_decl
))
16242 finish_constructor_body ();
16243 else if (DECL_DESTRUCTOR_P (current_function_decl
))
16244 finish_destructor_body ();
16247 /* Given a function, returns the BLOCK corresponding to the outermost level
16248 of curly braces, skipping the artificial block created for constructor
16252 outer_curly_brace_block (tree fndecl
)
16254 tree block
= DECL_INITIAL (fndecl
);
16255 if (BLOCK_OUTER_CURLY_BRACE_P (block
))
16257 block
= BLOCK_SUBBLOCKS (block
);
16258 if (BLOCK_OUTER_CURLY_BRACE_P (block
))
16260 block
= BLOCK_SUBBLOCKS (block
);
16261 gcc_assert (BLOCK_OUTER_CURLY_BRACE_P (block
));
16265 /* If FNDECL is a class's key method, add the class to the list of
16266 keyed classes that should be emitted. */
16269 record_key_method_defined (tree fndecl
)
16271 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fndecl
)
16272 && DECL_VIRTUAL_P (fndecl
)
16273 && !processing_template_decl
)
16275 tree fnclass
= DECL_CONTEXT (fndecl
);
16276 if (fndecl
== CLASSTYPE_KEY_METHOD (fnclass
))
16277 vec_safe_push (keyed_classes
, fnclass
);
16281 /* Subroutine of finish_function.
16282 Save the body of constexpr functions for possible
16283 future compile time evaluation. */
16286 maybe_save_function_definition (tree fun
)
16288 if (!processing_template_decl
16289 && DECL_DECLARED_CONSTEXPR_P (fun
)
16290 && !cp_function_chain
->invalid_constexpr
16291 && !DECL_CLONED_FUNCTION_P (fun
))
16292 register_constexpr_fundef (fun
, DECL_SAVED_TREE (fun
));
16295 /* Attempt to add a fix-it hint to RICHLOC suggesting the insertion
16296 of "return *this;" immediately before its location, using FNDECL's
16297 first statement (if any) to give the indentation, if appropriate. */
16300 add_return_star_this_fixit (gcc_rich_location
*richloc
, tree fndecl
)
16302 location_t indent
= UNKNOWN_LOCATION
;
16303 tree stmts
= expr_first (DECL_SAVED_TREE (fndecl
));
16305 indent
= EXPR_LOCATION (stmts
);
16306 richloc
->add_fixit_insert_formatted ("return *this;",
16307 richloc
->get_loc (),
16311 /* Finish up a function declaration and compile that function
16312 all the way to assembler language output. The free the storage
16313 for the function definition. INLINE_P is TRUE if we just
16314 finished processing the body of an in-class inline function
16315 definition. (This processing will have taken place after the
16316 class definition is complete.) */
16319 finish_function (bool inline_p
)
16321 tree fndecl
= current_function_decl
;
16322 tree fntype
, ctype
= NULL_TREE
;
16324 /* When we get some parse errors, we can end up without a
16325 current_function_decl, so cope. */
16326 if (fndecl
== NULL_TREE
)
16327 return error_mark_node
;
16329 finish_lambda_scope ();
16331 if (c_dialect_objc ())
16332 objc_finish_function ();
16334 record_key_method_defined (fndecl
);
16336 fntype
= TREE_TYPE (fndecl
);
16338 /* TREE_READONLY (fndecl) = 1;
16339 This caused &foo to be of type ptr-to-const-function
16340 which then got a warning when stored in a ptr-to-function variable. */
16342 gcc_assert (building_stmt_list_p ());
16343 /* The current function is being defined, so its DECL_INITIAL should
16344 be set, and unless there's a multiple definition, it should be
16345 error_mark_node. */
16346 gcc_assert (DECL_INITIAL (fndecl
) == error_mark_node
);
16348 /* For a cloned function, we've already got all the code we need;
16349 there's no need to add any extra bits. */
16350 if (!DECL_CLONED_FUNCTION_P (fndecl
))
16352 /* Make it so that `main' always returns 0 by default. */
16353 if (DECL_MAIN_P (current_function_decl
))
16354 finish_return_stmt (integer_zero_node
);
16356 if (use_eh_spec_block (current_function_decl
))
16357 finish_eh_spec_block (TYPE_RAISES_EXCEPTIONS
16358 (TREE_TYPE (current_function_decl
)),
16359 current_eh_spec_block
);
16362 /* If we're saving up tree structure, tie off the function now. */
16363 DECL_SAVED_TREE (fndecl
) = pop_stmt_list (DECL_SAVED_TREE (fndecl
));
16365 finish_fname_decls ();
16367 /* If this function can't throw any exceptions, remember that. */
16368 if (!processing_template_decl
16369 && !cp_function_chain
->can_throw
16370 && !flag_non_call_exceptions
16371 && !decl_replaceable_p (fndecl
))
16372 TREE_NOTHROW (fndecl
) = 1;
16374 /* This must come after expand_function_end because cleanups might
16375 have declarations (from inline functions) that need to go into
16376 this function's blocks. */
16378 /* If the current binding level isn't the outermost binding level
16379 for this function, either there is a bug, or we have experienced
16380 syntax errors and the statement tree is malformed. */
16381 if (current_binding_level
->kind
!= sk_function_parms
)
16383 /* Make sure we have already experienced errors. */
16384 gcc_assert (errorcount
);
16386 /* Throw away the broken statement tree and extra binding
16388 DECL_SAVED_TREE (fndecl
) = alloc_stmt_list ();
16390 while (current_binding_level
->kind
!= sk_function_parms
)
16392 if (current_binding_level
->kind
== sk_class
)
16393 pop_nested_class ();
16395 poplevel (0, 0, 0);
16398 poplevel (1, 0, 1);
16400 /* Statements should always be full-expressions at the outermost set
16401 of curly braces for a function. */
16402 gcc_assert (stmts_are_full_exprs_p ());
16404 /* If there are no return statements in a function with auto return type,
16405 the return type is void. But if the declared type is something like
16406 auto*, this is an error. */
16407 if (!processing_template_decl
&& FNDECL_USED_AUTO (fndecl
)
16408 && TREE_TYPE (fntype
) == DECL_SAVED_AUTO_RETURN_TYPE (fndecl
))
16410 if (is_auto (DECL_SAVED_AUTO_RETURN_TYPE (fndecl
))
16411 && !current_function_returns_value
16412 && !current_function_returns_null
)
16414 /* We haven't applied return type deduction because we haven't
16415 seen any return statements. Do that now. */
16416 tree node
= type_uses_auto (DECL_SAVED_AUTO_RETURN_TYPE (fndecl
));
16417 do_auto_deduction (DECL_SAVED_AUTO_RETURN_TYPE (fndecl
),
16418 void_node
, node
, tf_warning_or_error
,
16421 apply_deduced_return_type (fndecl
, void_type_node
);
16422 fntype
= TREE_TYPE (fndecl
);
16424 else if (!current_function_returns_value
16425 && !current_function_returns_null
)
16427 error ("no return statements in function returning %qT",
16428 DECL_SAVED_AUTO_RETURN_TYPE (fndecl
));
16429 inform (input_location
, "only plain %<auto%> return type can be "
16430 "deduced to %<void%>");
16434 // If this is a concept, check that the definition is reasonable.
16435 if (DECL_DECLARED_CONCEPT_P (fndecl
))
16436 check_function_concept (fndecl
);
16438 /* Lambda closure members are implicitly constexpr if possible. */
16439 if (cxx_dialect
>= cxx17
16440 && LAMBDA_TYPE_P (CP_DECL_CONTEXT (fndecl
)))
16441 DECL_DECLARED_CONSTEXPR_P (fndecl
)
16442 = ((processing_template_decl
16443 || is_valid_constexpr_fn (fndecl
, /*complain*/false))
16444 && potential_constant_expression (DECL_SAVED_TREE (fndecl
)));
16446 /* Save constexpr function body before it gets munged by
16447 the NRV transformation. */
16448 maybe_save_function_definition (fndecl
);
16450 /* Invoke the pre-genericize plugin before we start munging things. */
16451 if (!processing_template_decl
)
16452 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE
, fndecl
);
16454 /* Perform delayed folding before NRV transformation. */
16455 if (!processing_template_decl
)
16456 cp_fold_function (fndecl
);
16458 /* Set up the named return value optimization, if we can. Candidate
16459 variables are selected in check_return_expr. */
16460 if (current_function_return_value
)
16462 tree r
= current_function_return_value
;
16465 if (r
!= error_mark_node
16466 /* This is only worth doing for fns that return in memory--and
16467 simpler, since we don't have to worry about promoted modes. */
16468 && aggregate_value_p (TREE_TYPE (TREE_TYPE (fndecl
)), fndecl
)
16469 /* Only allow this for variables declared in the outer scope of
16470 the function so we know that their lifetime always ends with a
16471 return; see g++.dg/opt/nrv6.C. We could be more flexible if
16472 we were to do this optimization in tree-ssa. */
16473 && (outer
= outer_curly_brace_block (fndecl
))
16474 && chain_member (r
, BLOCK_VARS (outer
)))
16475 finalize_nrv (&DECL_SAVED_TREE (fndecl
), r
, DECL_RESULT (fndecl
));
16477 current_function_return_value
= NULL_TREE
;
16480 /* Remember that we were in class scope. */
16481 if (current_class_name
)
16482 ctype
= current_class_type
;
16484 /* Must mark the RESULT_DECL as being in this function. */
16485 DECL_CONTEXT (DECL_RESULT (fndecl
)) = fndecl
;
16487 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
16488 to the FUNCTION_DECL node itself. */
16489 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl
)) = fndecl
;
16491 /* Complain if there's just no return statement. */
16492 if (warn_return_type
16493 && !VOID_TYPE_P (TREE_TYPE (fntype
))
16494 && !dependent_type_p (TREE_TYPE (fntype
))
16495 && !current_function_returns_value
&& !current_function_returns_null
16496 /* Don't complain if we abort or throw. */
16497 && !current_function_returns_abnormally
16498 /* Don't complain if there's an infinite loop. */
16499 && !current_function_infinite_loop
16500 /* Don't complain if we are declared noreturn. */
16501 && !TREE_THIS_VOLATILE (fndecl
)
16502 && !DECL_NAME (DECL_RESULT (fndecl
))
16503 && !TREE_NO_WARNING (fndecl
)
16504 /* Structor return values (if any) are set by the compiler. */
16505 && !DECL_CONSTRUCTOR_P (fndecl
)
16506 && !DECL_DESTRUCTOR_P (fndecl
)
16507 && targetm
.warn_func_return (fndecl
))
16509 gcc_rich_location
richloc (input_location
);
16510 /* Potentially add a "return *this;" fix-it hint for
16511 assignment operators. */
16512 if (IDENTIFIER_ASSIGN_OP_P (DECL_NAME (fndecl
)))
16514 tree valtype
= TREE_TYPE (DECL_RESULT (fndecl
));
16515 if (TREE_CODE (valtype
) == REFERENCE_TYPE
16516 && current_class_ref
16517 && same_type_ignoring_top_level_qualifiers_p
16518 (TREE_TYPE (valtype
), TREE_TYPE (current_class_ref
))
16519 && global_dc
->option_enabled (OPT_Wreturn_type
,
16520 global_dc
->lang_mask
,
16521 global_dc
->option_state
))
16522 add_return_star_this_fixit (&richloc
, fndecl
);
16524 if (warning_at (&richloc
, OPT_Wreturn_type
,
16525 "no return statement in function returning non-void"))
16526 TREE_NO_WARNING (fndecl
) = 1;
16529 /* Store the end of the function, so that we get good line number
16530 info for the epilogue. */
16531 cfun
->function_end_locus
= input_location
;
16533 /* Complain about parameters that are only set, but never otherwise used. */
16534 if (warn_unused_but_set_parameter
16535 && !processing_template_decl
16536 && errorcount
== unused_but_set_errorcount
16537 && !DECL_CLONED_FUNCTION_P (fndecl
))
16541 for (decl
= DECL_ARGUMENTS (fndecl
);
16543 decl
= DECL_CHAIN (decl
))
16544 if (TREE_USED (decl
)
16545 && TREE_CODE (decl
) == PARM_DECL
16546 && !DECL_READ_P (decl
)
16547 && DECL_NAME (decl
)
16548 && !DECL_ARTIFICIAL (decl
)
16549 && !TREE_NO_WARNING (decl
)
16550 && !DECL_IN_SYSTEM_HEADER (decl
)
16551 && TREE_TYPE (decl
) != error_mark_node
16552 && !TYPE_REF_P (TREE_TYPE (decl
))
16553 && (!CLASS_TYPE_P (TREE_TYPE (decl
))
16554 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl
))))
16555 warning_at (DECL_SOURCE_LOCATION (decl
),
16556 OPT_Wunused_but_set_parameter
,
16557 "parameter %qD set but not used", decl
);
16558 unused_but_set_errorcount
= errorcount
;
16561 /* Complain about locally defined typedefs that are not used in this
16563 maybe_warn_unused_local_typedefs ();
16565 /* Possibly warn about unused parameters. */
16566 if (warn_unused_parameter
16567 && !processing_template_decl
16568 && !DECL_CLONED_FUNCTION_P (fndecl
))
16569 do_warn_unused_parameter (fndecl
);
16571 /* Genericize before inlining. */
16572 if (!processing_template_decl
)
16573 cp_genericize (fndecl
);
16575 /* We're leaving the context of this function, so zap cfun. It's still in
16576 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
16578 current_function_decl
= NULL
;
16580 /* If this is an in-class inline definition, we may have to pop the
16581 bindings for the template parameters that we added in
16582 maybe_begin_member_template_processing when start_function was
16585 maybe_end_member_template_processing ();
16587 /* Leave the scope of the class. */
16589 pop_nested_class ();
16594 current_function_decl
= NULL_TREE
;
16596 invoke_plugin_callbacks (PLUGIN_FINISH_PARSE_FUNCTION
, fndecl
);
16600 /* Create the FUNCTION_DECL for a function definition.
16601 DECLSPECS and DECLARATOR are the parts of the declaration;
16602 they describe the return type and the name of the function,
16603 but twisted together in a fashion that parallels the syntax of C.
16605 This function creates a binding context for the function body
16606 as well as setting up the FUNCTION_DECL in current_function_decl.
16608 Returns a FUNCTION_DECL on success.
16610 If the DECLARATOR is not suitable for a function (it defines a datum
16611 instead), we return 0, which tells yyparse to report a parse error.
16613 May return void_type_node indicating that this method is actually
16614 a friend. See grokfield for more details.
16616 Came here with a `.pushlevel' .
16618 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
16619 CHANGES TO CODE IN `grokfield'. */
16622 grokmethod (cp_decl_specifier_seq
*declspecs
,
16623 const cp_declarator
*declarator
, tree attrlist
)
16625 tree fndecl
= grokdeclarator (declarator
, declspecs
, MEMFUNCDEF
, 0,
16628 if (fndecl
== error_mark_node
)
16629 return error_mark_node
;
16632 cplus_decl_attributes (&fndecl
, attrlist
, 0);
16634 /* Pass friends other than inline friend functions back. */
16635 if (fndecl
== void_type_node
)
16638 if (DECL_IN_AGGR_P (fndecl
))
16640 if (DECL_CLASS_SCOPE_P (fndecl
))
16641 error ("%qD is already defined in class %qT", fndecl
,
16642 DECL_CONTEXT (fndecl
));
16643 return error_mark_node
;
16646 check_template_shadow (fndecl
);
16648 if (TREE_PUBLIC (fndecl
))
16649 DECL_COMDAT (fndecl
) = 1;
16650 DECL_DECLARED_INLINE_P (fndecl
) = 1;
16651 DECL_NO_INLINE_WARNING_P (fndecl
) = 1;
16653 /* We process method specializations in finish_struct_1. */
16654 if (processing_template_decl
&& !DECL_TEMPLATE_SPECIALIZATION (fndecl
))
16656 fndecl
= push_template_decl (fndecl
);
16657 if (fndecl
== error_mark_node
)
16661 if (! DECL_FRIEND_P (fndecl
))
16663 if (DECL_CHAIN (fndecl
))
16665 fndecl
= copy_node (fndecl
);
16666 TREE_CHAIN (fndecl
) = NULL_TREE
;
16670 cp_finish_decl (fndecl
, NULL_TREE
, false, NULL_TREE
, 0);
16672 DECL_IN_AGGR_P (fndecl
) = 1;
16677 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
16678 we can lay it out later, when and if its type becomes complete.
16680 Also handle constexpr variables where the initializer involves
16681 an unlowered PTRMEM_CST because the class isn't complete yet. */
16684 maybe_register_incomplete_var (tree var
)
16686 gcc_assert (VAR_P (var
));
16688 /* Keep track of variables with incomplete types. */
16689 if (!processing_template_decl
&& TREE_TYPE (var
) != error_mark_node
16690 && DECL_EXTERNAL (var
))
16692 tree inner_type
= TREE_TYPE (var
);
16694 while (TREE_CODE (inner_type
) == ARRAY_TYPE
)
16695 inner_type
= TREE_TYPE (inner_type
);
16696 inner_type
= TYPE_MAIN_VARIANT (inner_type
);
16698 if ((!COMPLETE_TYPE_P (inner_type
) && CLASS_TYPE_P (inner_type
))
16699 /* RTTI TD entries are created while defining the type_info. */
16700 || (TYPE_LANG_SPECIFIC (inner_type
)
16701 && TYPE_BEING_DEFINED (inner_type
)))
16703 incomplete_var iv
= {var
, inner_type
};
16704 vec_safe_push (incomplete_vars
, iv
);
16706 else if (!(DECL_LANG_SPECIFIC (var
) && DECL_TEMPLATE_INFO (var
))
16707 && decl_constant_var_p (var
)
16708 && (TYPE_PTRMEM_P (inner_type
) || CLASS_TYPE_P (inner_type
)))
16710 /* When the outermost open class is complete we can resolve any
16711 pointers-to-members. */
16712 tree context
= outermost_open_class ();
16713 incomplete_var iv
= {var
, context
};
16714 vec_safe_push (incomplete_vars
, iv
);
16719 /* Called when a class type (given by TYPE) is defined. If there are
16720 any existing VAR_DECLs whose type has been completed by this
16721 declaration, update them now. */
16724 complete_vars (tree type
)
16727 incomplete_var
*iv
;
16729 for (ix
= 0; vec_safe_iterate (incomplete_vars
, ix
, &iv
); )
16731 if (same_type_p (type
, iv
->incomplete_type
))
16733 tree var
= iv
->decl
;
16734 tree type
= TREE_TYPE (var
);
16736 if (type
!= error_mark_node
16737 && (TYPE_MAIN_VARIANT (strip_array_types (type
))
16738 == iv
->incomplete_type
))
16740 /* Complete the type of the variable. The VAR_DECL itself
16741 will be laid out in expand_expr. */
16742 complete_type (type
);
16743 cp_apply_type_quals_to_decl (cp_type_quals (type
), var
);
16746 /* Remove this entry from the list. */
16747 incomplete_vars
->unordered_remove (ix
);
16753 /* Check for pending declarations which may have abstract type. */
16754 complete_type_check_abstract (type
);
16757 /* If DECL is of a type which needs a cleanup, build and return an
16758 expression to perform that cleanup here. Return NULL_TREE if no
16759 cleanup need be done. DECL can also be a _REF when called from
16760 split_nonconstant_init_1. */
16763 cxx_maybe_build_cleanup (tree decl
, tsubst_flags_t complain
)
16769 /* Assume no cleanup is required. */
16770 cleanup
= NULL_TREE
;
16772 if (error_operand_p (decl
))
16775 /* Handle "__attribute__((cleanup))". We run the cleanup function
16776 before the destructor since the destructor is what actually
16777 terminates the lifetime of the object. */
16779 attr
= lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl
));
16788 /* Get the name specified by the user for the cleanup function. */
16789 id
= TREE_VALUE (TREE_VALUE (attr
));
16790 /* Look up the name to find the cleanup function to call. It is
16791 important to use lookup_name here because that is what is
16792 used in c-common.c:handle_cleanup_attribute when performing
16793 initial checks on the attribute. Note that those checks
16794 include ensuring that the function found is not an overloaded
16795 function, or an object with an overloaded call operator,
16796 etc.; we can rely on the fact that the function found is an
16797 ordinary FUNCTION_DECL. */
16798 fn
= lookup_name (id
);
16799 arg
= build_address (decl
);
16800 if (!mark_used (decl
, complain
) && !(complain
& tf_error
))
16801 return error_mark_node
;
16802 cleanup
= cp_build_function_call_nary (fn
, complain
, arg
, NULL_TREE
);
16803 if (cleanup
== error_mark_node
)
16804 return error_mark_node
;
16806 /* Handle ordinary C++ destructors. */
16807 type
= TREE_TYPE (decl
);
16808 if (type_build_dtor_call (type
))
16810 int flags
= LOOKUP_NORMAL
|LOOKUP_NONVIRTUAL
|LOOKUP_DESTRUCTOR
;
16814 if (TREE_CODE (type
) == ARRAY_TYPE
)
16817 addr
= build_address (decl
);
16819 call
= build_delete (TREE_TYPE (addr
), addr
,
16820 sfk_complete_destructor
, flags
, 0, complain
);
16821 if (call
== error_mark_node
)
16822 cleanup
= error_mark_node
;
16823 else if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type
))
16824 /* Discard the call. */;
16825 else if (decl_maybe_constant_destruction (decl
, type
)
16826 && DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl
))
16827 cxx_constant_dtor (call
, decl
);
16829 cleanup
= cp_build_compound_expr (cleanup
, call
, complain
);
16834 /* build_delete sets the location of the destructor call to the
16835 current location, even though the destructor is going to be
16836 called later, at the end of the current scope. This can lead to
16837 a "jumpy" behavior for users of debuggers when they step around
16838 the end of the block. So let's unset the location of the
16839 destructor call instead. */
16840 protected_set_expr_location (cleanup
, UNKNOWN_LOCATION
);
16841 if (cleanup
&& CONVERT_EXPR_P (cleanup
))
16842 protected_set_expr_location (TREE_OPERAND (cleanup
, 0), UNKNOWN_LOCATION
);
16846 && !lookup_attribute ("warn_unused", TYPE_ATTRIBUTES (TREE_TYPE (decl
)))
16847 /* Treat objects with destructors as used; the destructor may do
16848 something substantive. */
16849 && !mark_used (decl
, complain
) && !(complain
& tf_error
))
16850 return error_mark_node
;
16856 /* Return the FUNCTION_TYPE that corresponds to MEMFNTYPE, which can be a
16857 FUNCTION_DECL, METHOD_TYPE, FUNCTION_TYPE, pointer or reference to
16858 METHOD_TYPE or FUNCTION_TYPE, or pointer to member function. */
16861 static_fn_type (tree memfntype
)
16866 if (TYPE_PTRMEMFUNC_P (memfntype
))
16867 memfntype
= TYPE_PTRMEMFUNC_FN_TYPE (memfntype
);
16868 if (INDIRECT_TYPE_P (memfntype
)
16869 || TREE_CODE (memfntype
) == FUNCTION_DECL
)
16870 memfntype
= TREE_TYPE (memfntype
);
16871 if (TREE_CODE (memfntype
) == FUNCTION_TYPE
)
16873 gcc_assert (TREE_CODE (memfntype
) == METHOD_TYPE
);
16874 args
= TYPE_ARG_TYPES (memfntype
);
16875 fntype
= build_function_type (TREE_TYPE (memfntype
), TREE_CHAIN (args
));
16876 fntype
= apply_memfn_quals (fntype
, type_memfn_quals (memfntype
));
16877 fntype
= (cp_build_type_attribute_variant
16878 (fntype
, TYPE_ATTRIBUTES (memfntype
)));
16879 fntype
= cxx_copy_lang_qualifiers (fntype
, memfntype
);
16883 /* DECL was originally constructed as a non-static member function,
16884 but turned out to be static. Update it accordingly. */
16887 revert_static_member_fn (tree decl
)
16889 tree stype
= static_fn_type (decl
);
16890 cp_cv_quals quals
= type_memfn_quals (stype
);
16891 cp_ref_qualifier rqual
= type_memfn_rqual (stype
);
16893 if (quals
!= TYPE_UNQUALIFIED
|| rqual
!= REF_QUAL_NONE
)
16894 stype
= apply_memfn_quals (stype
, TYPE_UNQUALIFIED
, REF_QUAL_NONE
);
16896 TREE_TYPE (decl
) = stype
;
16898 if (DECL_ARGUMENTS (decl
))
16899 DECL_ARGUMENTS (decl
) = DECL_CHAIN (DECL_ARGUMENTS (decl
));
16900 DECL_STATIC_FUNCTION_P (decl
) = 1;
16903 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
16904 one of the language-independent trees. */
16906 enum cp_tree_node_structure_enum
16907 cp_tree_node_structure (union lang_tree_node
* t
)
16909 switch (TREE_CODE (&t
->generic
))
16911 case ARGUMENT_PACK_SELECT
: return TS_CP_ARGUMENT_PACK_SELECT
;
16912 case BASELINK
: return TS_CP_BASELINK
;
16913 case CONSTRAINT_INFO
: return TS_CP_CONSTRAINT_INFO
;
16914 case DEFERRED_NOEXCEPT
: return TS_CP_DEFERRED_NOEXCEPT
;
16915 case DEFERRED_PARSE
: return TS_CP_DEFERRED_PARSE
;
16916 case IDENTIFIER_NODE
: return TS_CP_IDENTIFIER
;
16917 case LAMBDA_EXPR
: return TS_CP_LAMBDA_EXPR
;
16918 case OVERLOAD
: return TS_CP_OVERLOAD
;
16919 case PTRMEM_CST
: return TS_CP_PTRMEM
;
16920 case STATIC_ASSERT
: return TS_CP_STATIC_ASSERT
;
16921 case TEMPLATE_DECL
: return TS_CP_TEMPLATE_DECL
;
16922 case TEMPLATE_INFO
: return TS_CP_TEMPLATE_INFO
;
16923 case TEMPLATE_PARM_INDEX
: return TS_CP_TPI
;
16924 case TRAIT_EXPR
: return TS_CP_TRAIT_EXPR
;
16925 case USERDEF_LITERAL
: return TS_CP_USERDEF_LITERAL
;
16926 default: return TS_CP_GENERIC
;
16930 /* Build the void_list_node (void_type_node having been created). */
16932 build_void_list_node (void)
16934 tree t
= build_tree_list (NULL_TREE
, void_type_node
);
16939 cp_missing_noreturn_ok_p (tree decl
)
16941 /* A missing noreturn is ok for the `main' function. */
16942 return DECL_MAIN_P (decl
);
16945 /* Return the decl used to identify the COMDAT group into which DECL should
16949 cxx_comdat_group (tree decl
)
16951 /* Virtual tables, construction virtual tables, and virtual table
16952 tables all go in a single COMDAT group, named after the primary
16954 if (VAR_P (decl
) && DECL_VTABLE_OR_VTT_P (decl
))
16955 decl
= CLASSTYPE_VTABLES (DECL_CONTEXT (decl
));
16956 /* For all other DECLs, the COMDAT group is the mangled name of the
16957 declaration itself. */
16960 while (DECL_THUNK_P (decl
))
16962 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
16963 into the same section as the target function. In that case
16964 we must return target's name. */
16965 tree target
= THUNK_TARGET (decl
);
16966 if (TARGET_USE_LOCAL_THUNK_ALIAS_P (target
)
16967 && DECL_SECTION_NAME (target
) != NULL
16968 && DECL_ONE_ONLY (target
))
16978 /* Returns the return type for FN as written by the user, which may include
16979 a placeholder for a deduced return type. */
16982 fndecl_declared_return_type (tree fn
)
16984 fn
= STRIP_TEMPLATE (fn
);
16985 if (FNDECL_USED_AUTO (fn
))
16986 return DECL_SAVED_AUTO_RETURN_TYPE (fn
);
16988 return TREE_TYPE (TREE_TYPE (fn
));
16991 /* Returns true iff DECL is a variable or function declared with an auto type
16992 that has not yet been deduced to a real type. */
16995 undeduced_auto_decl (tree decl
)
16997 if (cxx_dialect
< cxx11
)
16999 STRIP_ANY_LOCATION_WRAPPER (decl
);
17000 return ((VAR_OR_FUNCTION_DECL_P (decl
)
17001 || TREE_CODE (decl
) == TEMPLATE_DECL
)
17002 && type_uses_auto (TREE_TYPE (decl
)));
17005 /* Complain if DECL has an undeduced return type. */
17008 require_deduced_type (tree decl
, tsubst_flags_t complain
)
17010 if (undeduced_auto_decl (decl
))
17012 if (TREE_NO_WARNING (decl
) && seen_error ())
17013 /* We probably already complained about deduction failure. */;
17014 else if (complain
& tf_error
)
17015 error ("use of %qD before deduction of %<auto%>", decl
);
17021 /* Create a representation of the explicit-specifier with
17022 constant-expression of EXPR. COMPLAIN is as for tsubst. */
17025 build_explicit_specifier (tree expr
, tsubst_flags_t complain
)
17027 if (instantiation_dependent_expression_p (expr
))
17028 /* Wait for instantiation, tsubst_function_decl will handle it. */
17031 expr
= instantiate_non_dependent_expr_sfinae (expr
, complain
);
17032 /* Don't let convert_like_real create more template codes. */
17033 processing_template_decl_sentinel s
;
17034 expr
= build_converted_constant_bool_expr (expr
, complain
);
17035 expr
= cxx_constant_value (expr
);
17039 #include "gt-cp-decl.h"