1 /* Process declarations and variables for C++ compiler.
2 Copyright (C) 1988-2018 Free Software Foundation, Inc.
3 Contributed by Michael Tiemann (tiemann@cygnus.com)
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3, or (at your option)
12 GCC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING3. If not see
19 <http://www.gnu.org/licenses/>. */
22 /* Process declarations and symbol lookup for C++ front end.
23 Also constructs types; the standard scalar types at initialization,
24 and structure, union, array and enum types when they are declared. */
26 /* ??? not all decl nodes are given the most useful possible
27 line numbers. For example, the CONST_DECLs for enum values. */
31 #include "coretypes.h"
33 #include "c-family/c-target.h"
36 #include "stringpool.h"
38 #include "stor-layout.h"
42 #include "tree-iterator.h"
46 #include "c-family/c-objc.h"
47 #include "c-family/c-pragma.h"
48 #include "c-family/c-ubsan.h"
54 #include "gcc-rich-location.h"
56 /* Possible cases of bad specifiers type used by bad_specifiers. */
58 BSP_VAR
, /* variable */
59 BSP_PARM
, /* parameter */
64 static const char *redeclaration_error_message (tree
, tree
);
66 static int decl_jump_unsafe (tree
);
67 static void require_complete_types_for_parms (tree
);
68 static void push_local_name (tree
);
69 static tree
grok_reference_init (tree
, tree
, tree
, int);
70 static tree
grokvardecl (tree
, tree
, tree
, const cp_decl_specifier_seq
*,
71 int, int, int, bool, int, tree
);
72 static int check_static_variable_definition (tree
, tree
);
73 static void record_unknown_type (tree
, const char *);
74 static tree
builtin_function_1 (tree
, tree
, bool);
75 static int member_function_or_else (tree
, tree
, enum overload_flags
);
76 static tree
local_variable_p_walkfn (tree
*, int *, void *);
77 static const char *tag_name (enum tag_types
);
78 static tree
lookup_and_check_tag (enum tag_types
, tree
, tag_scope
, bool);
79 static void maybe_deduce_size_from_array_init (tree
, tree
);
80 static void layout_var_decl (tree
);
81 static tree
check_initializer (tree
, tree
, int, vec
<tree
, va_gc
> **);
82 static void make_rtl_for_nonlocal_decl (tree
, tree
, const char *);
83 static void save_function_data (tree
);
84 static void copy_type_enum (tree
, tree
);
85 static void check_function_type (tree
, tree
);
86 static void finish_constructor_body (void);
87 static void begin_destructor_body (void);
88 static void finish_destructor_body (void);
89 static void record_key_method_defined (tree
);
90 static tree
create_array_type_for_decl (tree
, tree
, tree
);
91 static tree
get_atexit_node (void);
92 static tree
get_dso_handle_node (void);
93 static tree
start_cleanup_fn (void);
94 static void end_cleanup_fn (void);
95 static tree
cp_make_fname_decl (location_t
, tree
, int);
96 static void initialize_predefined_identifiers (void);
97 static tree check_special_function_return_type
98 (special_function_kind
, tree
, tree
, int, const location_t
*);
99 static tree
push_cp_library_fn (enum tree_code
, tree
, int);
100 static tree
build_cp_library_fn (tree
, enum tree_code
, tree
, int);
101 static void store_parm_decls (tree
);
102 static void initialize_local_var (tree
, tree
);
103 static void expand_static_init (tree
, tree
);
105 /* The following symbols are subsumed in the cp_global_trees array, and
106 listed here individually for documentation purposes.
109 tree wchar_decl_node;
111 tree vtable_entry_type;
112 tree delta_type_node;
113 tree __t_desc_type_node;
115 tree class_type_node;
116 tree unknown_type_node;
118 Array type `vtable_entry_type[]'
121 tree vtbl_ptr_type_node;
128 A FUNCTION_DECL which can call `abort'. Not necessarily the
129 one that the user will declare, but sufficient to be called
130 by routines that want to abort the program.
135 tree type_info_type_node, tinfo_decl_id, tinfo_decl_type;
136 tree tinfo_var_id; */
138 tree cp_global_trees
[CPTI_MAX
];
140 #define local_names cp_function_chain->x_local_names
142 /* A list of objects which have constructors or destructors
143 which reside in the global scope. The decl is stored in
144 the TREE_VALUE slot and the initializer is stored
145 in the TREE_PURPOSE slot. */
146 tree static_aggregates
;
148 /* Like static_aggregates, but for thread_local variables. */
153 /* A node for the integer constant 2. */
155 tree integer_two_node
;
157 /* vector of static decls. */
158 vec
<tree
, va_gc
> *static_decls
;
160 /* vector of keyed classes. */
161 vec
<tree
, va_gc
> *keyed_classes
;
163 /* Used only for jumps to as-yet undefined labels, since jumps to
164 defined labels can have their validity checked immediately. */
166 struct GTY((chain_next ("%h.next"))) named_label_use_entry
{
167 struct named_label_use_entry
*next
;
168 /* The binding level to which this entry is *currently* attached.
169 This is initially the binding level in which the goto appeared,
170 but is modified as scopes are closed. */
171 cp_binding_level
*binding_level
;
172 /* The head of the names list that was current when the goto appeared,
173 or the inner scope popped. These are the decls that will *not* be
174 skipped when jumping to the label. */
176 /* The location of the goto, for error reporting. */
177 location_t o_goto_locus
;
178 /* True if an OpenMP structured block scope has been closed since
179 the goto appeared. This means that the branch from the label will
180 illegally exit an OpenMP scope. */
184 /* A list of all LABEL_DECLs in the function that have names. Here so
185 we can clear out their names' definitions at the end of the
186 function, and so we can check the validity of jumps to these labels. */
188 struct GTY((for_user
)) named_label_entry
{
190 tree name
; /* Name of decl. */
192 tree label_decl
; /* LABEL_DECL, unless deleted local label. */
194 named_label_entry
*outer
; /* Outer shadowed chain. */
196 /* The binding level to which the label is *currently* attached.
197 This is initially set to the binding level in which the label
198 is defined, but is modified as scopes are closed. */
199 cp_binding_level
*binding_level
;
201 /* The head of the names list that was current when the label was
202 defined, or the inner scope popped. These are the decls that will
203 be skipped when jumping to the label. */
206 /* A vector of all decls from all binding levels that would be
207 crossed by a backward branch to the label. */
208 vec
<tree
, va_gc
> *bad_decls
;
210 /* A list of uses of the label, before the label is defined. */
211 named_label_use_entry
*uses
;
213 /* The following bits are set after the label is defined, and are
214 updated as scopes are popped. They indicate that a jump to the
215 label will illegally enter a scope of the given flavor. */
219 bool in_transaction_scope
;
220 bool in_constexpr_if
;
223 #define named_labels cp_function_chain->x_named_labels
225 /* The number of function bodies which we are currently processing.
226 (Zero if we are at namespace scope, one inside the body of a
227 function, two inside the body of a function in a local class, etc.) */
230 /* Whether the exception-specifier is part of a function type (i.e. C++17). */
231 bool flag_noexcept_type
;
233 /* States indicating how grokdeclarator() should handle declspecs marked
234 with __attribute__((deprecated)). An object declared as
235 __attribute__((deprecated)) suppresses warnings of uses of other
237 enum deprecated_states deprecated_state
= DEPRECATED_NORMAL
;
240 /* A list of VAR_DECLs whose type was incomplete at the time the
241 variable was declared. */
243 struct GTY(()) incomplete_var
{
245 tree incomplete_type
;
249 static GTY(()) vec
<incomplete_var
, va_gc
> *incomplete_vars
;
251 /* Returns the kind of template specialization we are currently
252 processing, given that it's declaration contained N_CLASS_SCOPES
253 explicit scope qualifications. */
256 current_tmpl_spec_kind (int n_class_scopes
)
258 int n_template_parm_scopes
= 0;
259 int seen_specialization_p
= 0;
260 int innermost_specialization_p
= 0;
263 /* Scan through the template parameter scopes. */
264 for (b
= current_binding_level
;
265 b
->kind
== sk_template_parms
;
268 /* If we see a specialization scope inside a parameter scope,
269 then something is wrong. That corresponds to a declaration
272 template <class T> template <> ...
274 which is always invalid since [temp.expl.spec] forbids the
275 specialization of a class member template if the enclosing
276 class templates are not explicitly specialized as well. */
277 if (b
->explicit_spec_p
)
279 if (n_template_parm_scopes
== 0)
280 innermost_specialization_p
= 1;
282 seen_specialization_p
= 1;
284 else if (seen_specialization_p
== 1)
285 return tsk_invalid_member_spec
;
287 ++n_template_parm_scopes
;
290 /* Handle explicit instantiations. */
291 if (processing_explicit_instantiation
)
293 if (n_template_parm_scopes
!= 0)
294 /* We've seen a template parameter list during an explicit
295 instantiation. For example:
297 template <class T> template void f(int);
299 This is erroneous. */
300 return tsk_invalid_expl_inst
;
302 return tsk_expl_inst
;
305 if (n_template_parm_scopes
< n_class_scopes
)
306 /* We've not seen enough template headers to match all the
307 specialized classes present. For example:
309 template <class T> void R<T>::S<T>::f(int);
311 This is invalid; there needs to be one set of template
312 parameters for each class. */
313 return tsk_insufficient_parms
;
314 else if (n_template_parm_scopes
== n_class_scopes
)
315 /* We're processing a non-template declaration (even though it may
316 be a member of a template class.) For example:
318 template <class T> void S<T>::f(int);
320 The `class T' matches the `S<T>', leaving no template headers
321 corresponding to the `f'. */
323 else if (n_template_parm_scopes
> n_class_scopes
+ 1)
324 /* We've got too many template headers. For example:
326 template <> template <class T> void f (T);
328 There need to be more enclosing classes. */
329 return tsk_excessive_parms
;
331 /* This must be a template. It's of the form:
333 template <class T> template <class U> void S<T>::f(U);
335 This is a specialization if the innermost level was a
336 specialization; otherwise it's just a definition of the
338 return innermost_specialization_p
? tsk_expl_spec
: tsk_template
;
341 /* Exit the current scope. */
349 /* When a label goes out of scope, check to see if that label was used
350 in a valid manner, and issue any appropriate warnings or errors. */
353 check_label_used (tree label
)
355 if (!processing_template_decl
)
357 if (DECL_INITIAL (label
) == NULL_TREE
)
361 error ("label %q+D used but not defined", label
);
362 location
= input_location
;
363 /* FIXME want (LOCATION_FILE (input_location), (line)0) */
364 /* Avoid crashing later. */
365 define_label (location
, DECL_NAME (label
));
368 warn_for_unused_label (label
);
372 /* Helper function to sort named label entries in a vector by DECL_UID. */
375 sort_labels (const void *a
, const void *b
)
377 tree label1
= *(tree
const *) a
;
378 tree label2
= *(tree
const *) b
;
380 /* DECL_UIDs can never be equal. */
381 return DECL_UID (label1
) > DECL_UID (label2
) ? -1 : +1;
384 /* At the end of a function, all labels declared within the function
385 go out of scope. BLOCK is the top-level block for the
389 pop_labels (tree block
)
394 /* We need to add the labels to the block chain, so debug
395 information is emitted. But, we want the order to be stable so
396 need to sort them first. Otherwise the debug output could be
397 randomly ordered. I guess it's mostly stable, unless the hash
398 table implementation changes. */
399 auto_vec
<tree
, 32> labels (named_labels
->elements ());
400 hash_table
<named_label_hash
>::iterator
end (named_labels
->end ());
401 for (hash_table
<named_label_hash
>::iterator iter
402 (named_labels
->begin ()); iter
!= end
; ++iter
)
404 named_label_entry
*ent
= *iter
;
406 gcc_checking_assert (!ent
->outer
);
408 labels
.quick_push (ent
->label_decl
);
412 labels
.qsort (sort_labels
);
414 while (labels
.length ())
416 tree label
= labels
.pop ();
418 DECL_CHAIN (label
) = BLOCK_VARS (block
);
419 BLOCK_VARS (block
) = label
;
421 check_label_used (label
);
425 /* At the end of a block with local labels, restore the outer definition. */
428 pop_local_label (tree id
, tree label
)
430 check_label_used (label
);
431 named_label_entry
**slot
= named_labels
->find_slot_with_hash
432 (id
, IDENTIFIER_HASH_VALUE (id
), NO_INSERT
);
433 named_label_entry
*ent
= *slot
;
439 ent
= ggc_cleared_alloc
<named_label_entry
> ();
445 /* The following two routines are used to interface to Objective-C++.
446 The binding level is purposely treated as an opaque type. */
449 objc_get_current_scope (void)
451 return current_binding_level
;
454 /* The following routine is used by the NeXT-style SJLJ exceptions;
455 variables get marked 'volatile' so as to not be clobbered by
456 _setjmp()/_longjmp() calls. All variables in the current scope,
457 as well as parent scopes up to (but not including) ENCLOSING_BLK
458 shall be thusly marked. */
461 objc_mark_locals_volatile (void *enclosing_blk
)
463 cp_binding_level
*scope
;
465 for (scope
= current_binding_level
;
466 scope
&& scope
!= enclosing_blk
;
467 scope
= scope
->level_chain
)
471 for (decl
= scope
->names
; decl
; decl
= TREE_CHAIN (decl
))
472 objc_volatilize_decl (decl
);
474 /* Do not climb up past the current function. */
475 if (scope
->kind
== sk_function_parms
)
480 /* True if B is the level for the condition of a constexpr if. */
483 level_for_constexpr_if (cp_binding_level
*b
)
485 return (b
->kind
== sk_cond
&& b
->this_entity
486 && TREE_CODE (b
->this_entity
) == IF_STMT
487 && IF_STMT_CONSTEXPR_P (b
->this_entity
));
490 /* Update data for defined and undefined labels when leaving a scope. */
493 poplevel_named_label_1 (named_label_entry
**slot
, cp_binding_level
*bl
)
495 named_label_entry
*ent
= *slot
;
496 cp_binding_level
*obl
= bl
->level_chain
;
498 if (ent
->binding_level
== bl
)
502 /* ENT->NAMES_IN_SCOPE may contain a mixture of DECLs and
503 TREE_LISTs representing OVERLOADs, so be careful. */
504 for (decl
= ent
->names_in_scope
; decl
; decl
= (DECL_P (decl
)
506 : TREE_CHAIN (decl
)))
507 if (decl_jump_unsafe (decl
))
508 vec_safe_push (ent
->bad_decls
, decl
);
510 ent
->binding_level
= obl
;
511 ent
->names_in_scope
= obl
->names
;
515 ent
->in_try_scope
= true;
518 ent
->in_catch_scope
= true;
521 ent
->in_omp_scope
= true;
524 ent
->in_transaction_scope
= true;
527 if (level_for_constexpr_if (bl
->level_chain
))
528 ent
->in_constexpr_if
= true;
536 struct named_label_use_entry
*use
;
538 for (use
= ent
->uses
; use
; use
= use
->next
)
539 if (use
->binding_level
== bl
)
541 use
->binding_level
= obl
;
542 use
->names_in_scope
= obl
->names
;
543 if (bl
->kind
== sk_omp
)
544 use
->in_omp_scope
= true;
551 /* Saved errorcount to avoid -Wunused-but-set-{parameter,variable} warnings
552 when errors were reported, except for -Werror-unused-but-set-*. */
553 static int unused_but_set_errorcount
;
555 /* Exit a binding level.
556 Pop the level off, and restore the state of the identifier-decl mappings
557 that were in effect when this level was entered.
559 If KEEP == 1, this level had explicit declarations, so
560 and create a "block" (a BLOCK node) for the level
561 to record its declarations and subblocks for symbol table output.
563 If FUNCTIONBODY is nonzero, this level is the body of a function,
564 so create a block as if KEEP were set and also clear out all
567 If REVERSE is nonzero, reverse the order of decls before putting
568 them into the BLOCK. */
571 poplevel (int keep
, int reverse
, int functionbody
)
574 /* The chain of decls was accumulated in reverse order.
575 Put it into forward order, just for cleanliness. */
582 bool subtime
= timevar_cond_start (TV_NAME_LOOKUP
);
587 gcc_assert (current_binding_level
->kind
!= sk_class
588 && current_binding_level
->kind
!= sk_namespace
);
590 if (current_binding_level
->kind
== sk_cleanup
)
592 subblocks
= functionbody
>= 0 ? current_binding_level
->blocks
: 0;
594 gcc_assert (!vec_safe_length (current_binding_level
->class_shadowed
));
596 /* We used to use KEEP == 2 to indicate that the new block should go
597 at the beginning of the list of blocks at this binding level,
598 rather than the end. This hack is no longer used. */
599 gcc_assert (keep
== 0 || keep
== 1);
601 if (current_binding_level
->keep
)
604 /* Any uses of undefined labels, and any defined labels, now operate
605 under constraints of next binding contour. */
606 if (cfun
&& !functionbody
&& named_labels
)
607 named_labels
->traverse
<cp_binding_level
*, poplevel_named_label_1
>
608 (current_binding_level
);
610 /* Get the decls in the order they were written.
611 Usually current_binding_level->names is in reverse order.
612 But parameter decls were previously put in forward order. */
614 decls
= current_binding_level
->names
;
617 decls
= nreverse (decls
);
618 current_binding_level
->names
= decls
;
621 /* If there were any declarations or structure tags in that level,
622 or if this level is a function body,
623 create a BLOCK to record them for the life of this function. */
625 /* Avoid function body block if possible. */
626 if (functionbody
&& subblocks
&& BLOCK_CHAIN (subblocks
) == NULL_TREE
)
628 else if (keep
== 1 || functionbody
)
629 block
= make_node (BLOCK
);
630 if (block
!= NULL_TREE
)
632 BLOCK_VARS (block
) = decls
;
633 BLOCK_SUBBLOCKS (block
) = subblocks
;
636 /* In each subblock, record that this is its superior. */
638 for (link
= subblocks
; link
; link
= BLOCK_CHAIN (link
))
639 BLOCK_SUPERCONTEXT (link
) = block
;
641 /* Before we remove the declarations first check for unused variables. */
642 if ((warn_unused_variable
|| warn_unused_but_set_variable
)
643 && current_binding_level
->kind
!= sk_template_parms
644 && !processing_template_decl
)
645 for (tree d
= get_local_decls (); d
; d
= TREE_CHAIN (d
))
647 /* There are cases where D itself is a TREE_LIST. See in
648 push_local_binding where the list of decls returned by
649 getdecls is built. */
650 decl
= TREE_CODE (d
) == TREE_LIST
? TREE_VALUE (d
) : d
;
652 tree type
= TREE_TYPE (decl
);
654 && (! TREE_USED (decl
) || !DECL_READ_P (decl
))
655 && ! DECL_IN_SYSTEM_HEADER (decl
)
656 /* For structured bindings, consider only real variables, not
658 && (DECL_DECOMPOSITION_P (decl
) ? !DECL_DECOMP_BASE (decl
)
659 : (DECL_NAME (decl
) && !DECL_ARTIFICIAL (decl
)))
660 && type
!= error_mark_node
661 && (!CLASS_TYPE_P (type
)
662 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type
)
663 || lookup_attribute ("warn_unused",
664 TYPE_ATTRIBUTES (TREE_TYPE (decl
)))))
666 if (! TREE_USED (decl
))
668 if (!DECL_NAME (decl
) && DECL_DECOMPOSITION_P (decl
))
669 warning_at (DECL_SOURCE_LOCATION (decl
),
670 OPT_Wunused_variable
,
671 "unused structured binding declaration");
673 warning_at (DECL_SOURCE_LOCATION (decl
),
674 OPT_Wunused_variable
, "unused variable %qD", decl
);
676 else if (DECL_CONTEXT (decl
) == current_function_decl
677 // For -Wunused-but-set-variable leave references alone.
678 && !TYPE_REF_P (TREE_TYPE (decl
))
679 && errorcount
== unused_but_set_errorcount
)
681 if (!DECL_NAME (decl
) && DECL_DECOMPOSITION_P (decl
))
682 warning_at (DECL_SOURCE_LOCATION (decl
),
683 OPT_Wunused_but_set_variable
, "structured "
684 "binding declaration set but not used");
686 warning_at (DECL_SOURCE_LOCATION (decl
),
687 OPT_Wunused_but_set_variable
,
688 "variable %qD set but not used", decl
);
689 unused_but_set_errorcount
= errorcount
;
694 /* Remove declarations for all the DECLs in this level. */
695 for (link
= decls
; link
; link
= TREE_CHAIN (link
))
697 decl
= TREE_CODE (link
) == TREE_LIST
? TREE_VALUE (link
) : link
;
698 tree name
= OVL_NAME (decl
);
700 /* Remove the binding. */
701 if (TREE_CODE (decl
) == LABEL_DECL
)
702 pop_local_label (name
, decl
);
704 pop_local_binding (name
, decl
);
707 /* Restore the IDENTIFIER_TYPE_VALUEs. */
708 for (link
= current_binding_level
->type_shadowed
;
709 link
; link
= TREE_CHAIN (link
))
710 SET_IDENTIFIER_TYPE_VALUE (TREE_PURPOSE (link
), TREE_VALUE (link
));
712 /* There may be OVERLOADs (wrapped in TREE_LISTs) on the BLOCK_VARs
713 list if a `using' declaration put them there. The debugging
714 back ends won't understand OVERLOAD, so we remove them here.
715 Because the BLOCK_VARS are (temporarily) shared with
716 CURRENT_BINDING_LEVEL->NAMES we must do this fixup after we have
717 popped all the bindings. Also remove undeduced 'auto' decls,
718 which LTO doesn't understand, and can't have been used by anything. */
723 for (d
= &BLOCK_VARS (block
); *d
; )
725 if (TREE_CODE (*d
) == TREE_LIST
726 || (!processing_template_decl
727 && undeduced_auto_decl (*d
)))
728 *d
= TREE_CHAIN (*d
);
730 d
= &DECL_CHAIN (*d
);
734 /* If the level being exited is the top level of a function,
735 check over all the labels. */
740 /* Since this is the top level block of a function, the vars are
741 the function's parameters. Don't leave them in the BLOCK
742 because they are found in the FUNCTION_DECL instead. */
743 BLOCK_VARS (block
) = 0;
747 pop_labels (subblocks
);
750 kind
= current_binding_level
->kind
;
751 if (kind
== sk_cleanup
)
755 /* If this is a temporary binding created for a cleanup, then we'll
756 have pushed a statement list level. Pop that, create a new
757 BIND_EXPR for the block, and insert it into the stream. */
758 stmt
= pop_stmt_list (current_binding_level
->statement_list
);
759 stmt
= c_build_bind_expr (input_location
, block
, stmt
);
766 /* The current function is being defined, so its DECL_INITIAL
767 should be error_mark_node. */
768 gcc_assert (DECL_INITIAL (current_function_decl
) == error_mark_node
);
769 DECL_INITIAL (current_function_decl
) = block
? block
: subblocks
;
772 if (FUNCTION_NEEDS_BODY_BLOCK (current_function_decl
))
774 if (BLOCK_SUBBLOCKS (subblocks
))
775 BLOCK_OUTER_CURLY_BRACE_P (BLOCK_SUBBLOCKS (subblocks
)) = 1;
778 BLOCK_OUTER_CURLY_BRACE_P (subblocks
) = 1;
782 current_binding_level
->blocks
783 = block_chainon (current_binding_level
->blocks
, block
);
785 /* If we did not make a block for the level just exited,
786 any blocks made for inner levels
787 (since they cannot be recorded as subblocks in that level)
788 must be carried forward so they will later become subblocks
789 of something else. */
791 current_binding_level
->blocks
792 = block_chainon (current_binding_level
->blocks
, subblocks
);
794 /* Each and every BLOCK node created here in `poplevel' is important
795 (e.g. for proper debugging information) so if we created one
796 earlier, mark it as "used". */
798 TREE_USED (block
) = 1;
800 /* All temporary bindings created for cleanups are popped silently. */
801 if (kind
== sk_cleanup
)
804 timevar_cond_stop (TV_NAME_LOOKUP
, subtime
);
808 /* Call wrapup_globals_declarations for the globals in NAMESPACE. */
809 /* Diagnose odr-used extern inline variables without definitions
810 in the current TU. */
813 wrapup_namespace_globals ()
815 if (vec
<tree
, va_gc
> *statics
= static_decls
)
819 FOR_EACH_VEC_ELT (*statics
, i
, decl
)
821 if (warn_unused_function
822 && TREE_CODE (decl
) == FUNCTION_DECL
823 && DECL_INITIAL (decl
) == 0
824 && DECL_EXTERNAL (decl
)
825 && !TREE_PUBLIC (decl
)
826 && !DECL_ARTIFICIAL (decl
)
827 && !DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl
)
828 && !TREE_NO_WARNING (decl
))
829 warning_at (DECL_SOURCE_LOCATION (decl
),
830 OPT_Wunused_function
,
831 "%qF declared %<static%> but never defined", decl
);
834 && DECL_EXTERNAL (decl
)
835 && DECL_INLINE_VAR_P (decl
)
836 && DECL_ODR_USED (decl
))
837 error_at (DECL_SOURCE_LOCATION (decl
),
838 "odr-used inline variable %qD is not defined", decl
);
841 /* Clear out the list, so we don't rescan next time. */
844 /* Write out any globals that need to be output. */
845 return wrapup_global_declarations (statics
->address (),
851 /* In C++, you don't have to write `struct S' to refer to `S'; you
852 can just use `S'. We accomplish this by creating a TYPE_DECL as
853 if the user had written `typedef struct S S'. Create and return
854 the TYPE_DECL for TYPE. */
857 create_implicit_typedef (tree name
, tree type
)
861 decl
= build_decl (input_location
, TYPE_DECL
, name
, type
);
862 DECL_ARTIFICIAL (decl
) = 1;
863 /* There are other implicit type declarations, like the one *within*
864 a class that allows you to write `S::S'. We must distinguish
866 SET_DECL_IMPLICIT_TYPEDEF_P (decl
);
867 TYPE_NAME (type
) = decl
;
868 TYPE_STUB_DECL (type
) = decl
;
873 /* Remember a local name for name-mangling purposes. */
876 push_local_name (tree decl
)
881 timevar_start (TV_NAME_LOOKUP
);
883 name
= DECL_NAME (decl
);
885 nelts
= vec_safe_length (local_names
);
886 for (i
= 0; i
< nelts
; i
++)
888 t
= (*local_names
)[i
];
889 if (DECL_NAME (t
) == name
)
891 retrofit_lang_decl (decl
);
892 DECL_LANG_SPECIFIC (decl
)->u
.base
.u2sel
= 1;
893 if (DECL_DISCRIMINATOR_SET_P (t
))
894 DECL_DISCRIMINATOR (decl
) = DECL_DISCRIMINATOR (t
) + 1;
896 DECL_DISCRIMINATOR (decl
) = 1;
898 (*local_names
)[i
] = decl
;
899 timevar_stop (TV_NAME_LOOKUP
);
904 vec_safe_push (local_names
, decl
);
905 timevar_stop (TV_NAME_LOOKUP
);
908 /* Subroutine of duplicate_decls: return truthvalue of whether
909 or not types of these decls match.
911 For C++, we must compare the parameter list so that `int' can match
912 `int&' in a parameter position, but `int&' is not confused with
916 decls_match (tree newdecl
, tree olddecl
, bool record_versions
/* = true */)
920 if (newdecl
== olddecl
)
923 if (TREE_CODE (newdecl
) != TREE_CODE (olddecl
))
924 /* If the two DECLs are not even the same kind of thing, we're not
925 interested in their types. */
928 gcc_assert (DECL_P (newdecl
));
930 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
932 tree f1
= TREE_TYPE (newdecl
);
933 tree f2
= TREE_TYPE (olddecl
);
934 tree p1
= TYPE_ARG_TYPES (f1
);
935 tree p2
= TYPE_ARG_TYPES (f2
);
938 /* Specializations of different templates are different functions
939 even if they have the same type. */
940 tree t1
= (DECL_USE_TEMPLATE (newdecl
)
941 ? DECL_TI_TEMPLATE (newdecl
)
943 tree t2
= (DECL_USE_TEMPLATE (olddecl
)
944 ? DECL_TI_TEMPLATE (olddecl
)
949 if (CP_DECL_CONTEXT (newdecl
) != CP_DECL_CONTEXT (olddecl
)
950 && ! (DECL_EXTERN_C_P (newdecl
)
951 && DECL_EXTERN_C_P (olddecl
)))
954 /* A new declaration doesn't match a built-in one unless it
955 is also extern "C". */
956 if (DECL_IS_BUILTIN (olddecl
)
957 && DECL_EXTERN_C_P (olddecl
) && !DECL_EXTERN_C_P (newdecl
))
960 if (TREE_CODE (f1
) != TREE_CODE (f2
))
963 /* A declaration with deduced return type should use its pre-deduction
964 type for declaration matching. */
965 r2
= fndecl_declared_return_type (olddecl
);
967 if (same_type_p (TREE_TYPE (f1
), r2
))
969 if (!prototype_p (f2
) && DECL_EXTERN_C_P (olddecl
)
970 && (DECL_BUILT_IN (olddecl
)
971 #ifdef SYSTEM_IMPLICIT_EXTERN_C
972 || (DECL_IN_SYSTEM_HEADER (newdecl
) && !DECL_CLASS_SCOPE_P (newdecl
))
973 || (DECL_IN_SYSTEM_HEADER (olddecl
) && !DECL_CLASS_SCOPE_P (olddecl
))
977 types_match
= self_promoting_args_p (p1
);
978 if (p1
== void_list_node
)
979 TREE_TYPE (newdecl
) = TREE_TYPE (olddecl
);
981 #ifdef SYSTEM_IMPLICIT_EXTERN_C
982 else if (!prototype_p (f1
)
983 && (DECL_EXTERN_C_P (olddecl
)
984 && DECL_IN_SYSTEM_HEADER (olddecl
)
985 && !DECL_CLASS_SCOPE_P (olddecl
))
986 && (DECL_EXTERN_C_P (newdecl
)
987 && DECL_IN_SYSTEM_HEADER (newdecl
)
988 && !DECL_CLASS_SCOPE_P (newdecl
)))
990 types_match
= self_promoting_args_p (p2
);
991 TREE_TYPE (newdecl
) = TREE_TYPE (olddecl
);
997 && type_memfn_rqual (f1
) == type_memfn_rqual (f2
)
998 && (TYPE_ATTRIBUTES (TREE_TYPE (newdecl
)) == NULL_TREE
999 || comp_type_attributes (TREE_TYPE (newdecl
),
1000 TREE_TYPE (olddecl
)) != 0);
1005 /* The decls dont match if they correspond to two different versions
1006 of the same function. Disallow extern "C" functions to be
1007 versions for now. */
1009 && !DECL_EXTERN_C_P (newdecl
)
1010 && !DECL_EXTERN_C_P (olddecl
)
1012 && maybe_version_functions (newdecl
, olddecl
,
1013 (!DECL_FUNCTION_VERSIONED (newdecl
)
1014 || !DECL_FUNCTION_VERSIONED (olddecl
))))
1017 else if (TREE_CODE (newdecl
) == TEMPLATE_DECL
)
1019 tree oldres
= DECL_TEMPLATE_RESULT (olddecl
);
1020 tree newres
= DECL_TEMPLATE_RESULT (newdecl
);
1022 if (TREE_CODE (newres
) != TREE_CODE (oldres
))
1025 if (!comp_template_parms (DECL_TEMPLATE_PARMS (newdecl
),
1026 DECL_TEMPLATE_PARMS (olddecl
)))
1029 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl
)) == TYPE_DECL
)
1030 types_match
= (same_type_p (TREE_TYPE (oldres
), TREE_TYPE (newres
))
1031 && equivalently_constrained (olddecl
, newdecl
));
1033 // We don't need to check equivalently_constrained for variable and
1034 // function templates because we check it on the results.
1035 types_match
= decls_match (oldres
, newres
);
1039 /* Need to check scope for variable declaration (VAR_DECL).
1040 For typedef (TYPE_DECL), scope is ignored. */
1042 && CP_DECL_CONTEXT (newdecl
) != CP_DECL_CONTEXT (olddecl
)
1044 Two declarations for an object with C language linkage
1045 with the same name (ignoring the namespace that qualify
1046 it) that appear in different namespace scopes refer to
1048 && !(DECL_EXTERN_C_P (olddecl
) && DECL_EXTERN_C_P (newdecl
)))
1051 if (TREE_TYPE (newdecl
) == error_mark_node
)
1052 types_match
= TREE_TYPE (olddecl
) == error_mark_node
;
1053 else if (TREE_TYPE (olddecl
) == NULL_TREE
)
1054 types_match
= TREE_TYPE (newdecl
) == NULL_TREE
;
1055 else if (TREE_TYPE (newdecl
) == NULL_TREE
)
1058 types_match
= comptypes (TREE_TYPE (newdecl
),
1059 TREE_TYPE (olddecl
),
1060 COMPARE_REDECLARATION
);
1063 // Normal functions can be constrained, as can variable partial
1065 if (types_match
&& VAR_OR_FUNCTION_DECL_P (newdecl
))
1066 types_match
= equivalently_constrained (newdecl
, olddecl
);
1071 /* NEWDECL and OLDDECL have identical signatures. If they are
1072 different versions adjust them and return true.
1073 If RECORD is set to true, record function versions. */
1076 maybe_version_functions (tree newdecl
, tree olddecl
, bool record
)
1078 if (!targetm
.target_option
.function_versions (newdecl
, olddecl
))
1081 if (!DECL_FUNCTION_VERSIONED (olddecl
))
1083 DECL_FUNCTION_VERSIONED (olddecl
) = 1;
1084 if (DECL_ASSEMBLER_NAME_SET_P (olddecl
))
1085 mangle_decl (olddecl
);
1088 if (!DECL_FUNCTION_VERSIONED (newdecl
))
1090 DECL_FUNCTION_VERSIONED (newdecl
) = 1;
1091 if (DECL_ASSEMBLER_NAME_SET_P (newdecl
))
1092 mangle_decl (newdecl
);
1096 cgraph_node::record_function_versions (olddecl
, newdecl
);
1101 /* If NEWDECL is `static' and an `extern' was seen previously,
1102 warn about it. OLDDECL is the previous declaration.
1104 Note that this does not apply to the C++ case of declaring
1105 a variable `extern const' and then later `const'.
1107 Don't complain about built-in functions, since they are beyond
1108 the user's control. */
1111 warn_extern_redeclared_static (tree newdecl
, tree olddecl
)
1113 if (TREE_CODE (newdecl
) == TYPE_DECL
1114 || TREE_CODE (newdecl
) == TEMPLATE_DECL
1115 || TREE_CODE (newdecl
) == CONST_DECL
1116 || TREE_CODE (newdecl
) == NAMESPACE_DECL
)
1119 /* Don't get confused by static member functions; that's a different
1121 if (TREE_CODE (newdecl
) == FUNCTION_DECL
1122 && DECL_STATIC_FUNCTION_P (newdecl
))
1125 /* If the old declaration was `static', or the new one isn't, then
1126 everything is OK. */
1127 if (DECL_THIS_STATIC (olddecl
) || !DECL_THIS_STATIC (newdecl
))
1130 /* It's OK to declare a builtin function as `static'. */
1131 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1132 && DECL_ARTIFICIAL (olddecl
))
1135 if (permerror (DECL_SOURCE_LOCATION (newdecl
),
1136 "%qD was declared %<extern%> and later %<static%>", newdecl
))
1137 inform (DECL_SOURCE_LOCATION (olddecl
),
1138 "previous declaration of %qD", olddecl
);
1141 /* NEW_DECL is a redeclaration of OLD_DECL; both are functions or
1142 function templates. If their exception specifications do not
1143 match, issue a diagnostic. */
1146 check_redeclaration_exception_specification (tree new_decl
,
1149 tree new_exceptions
= TYPE_RAISES_EXCEPTIONS (TREE_TYPE (new_decl
));
1150 tree old_exceptions
= TYPE_RAISES_EXCEPTIONS (TREE_TYPE (old_decl
));
1152 /* Two default specs are equivalent, don't force evaluation. */
1153 if (UNEVALUATED_NOEXCEPT_SPEC_P (new_exceptions
)
1154 && UNEVALUATED_NOEXCEPT_SPEC_P (old_exceptions
))
1157 if (!type_dependent_expression_p (old_decl
))
1159 maybe_instantiate_noexcept (new_decl
);
1160 maybe_instantiate_noexcept (old_decl
);
1162 new_exceptions
= TYPE_RAISES_EXCEPTIONS (TREE_TYPE (new_decl
));
1163 old_exceptions
= TYPE_RAISES_EXCEPTIONS (TREE_TYPE (old_decl
));
1167 If any declaration of a function has an exception-specification,
1168 all declarations, including the definition and an explicit
1169 specialization, of that function shall have an
1170 exception-specification with the same set of type-ids. */
1171 if (! DECL_IS_BUILTIN (old_decl
)
1172 && !comp_except_specs (new_exceptions
, old_exceptions
, ce_normal
))
1174 const char *const msg
1175 = G_("declaration of %qF has a different exception specifier");
1176 bool complained
= true;
1177 location_t new_loc
= DECL_SOURCE_LOCATION (new_decl
);
1178 if (DECL_IN_SYSTEM_HEADER (old_decl
))
1179 complained
= pedwarn (new_loc
, OPT_Wsystem_headers
, msg
, new_decl
);
1180 else if (!flag_exceptions
)
1181 /* We used to silently permit mismatched eh specs with
1182 -fno-exceptions, so make them a pedwarn now. */
1183 complained
= pedwarn (new_loc
, OPT_Wpedantic
, msg
, new_decl
);
1185 error_at (new_loc
, msg
, new_decl
);
1187 inform (DECL_SOURCE_LOCATION (old_decl
),
1188 "from previous declaration %qF", old_decl
);
1192 /* Return true if OLD_DECL and NEW_DECL agree on constexprness.
1193 Otherwise issue diagnostics. */
1196 validate_constexpr_redeclaration (tree old_decl
, tree new_decl
)
1198 old_decl
= STRIP_TEMPLATE (old_decl
);
1199 new_decl
= STRIP_TEMPLATE (new_decl
);
1200 if (!VAR_OR_FUNCTION_DECL_P (old_decl
)
1201 || !VAR_OR_FUNCTION_DECL_P (new_decl
))
1203 if (DECL_DECLARED_CONSTEXPR_P (old_decl
)
1204 == DECL_DECLARED_CONSTEXPR_P (new_decl
))
1206 if (TREE_CODE (old_decl
) == FUNCTION_DECL
)
1208 if (DECL_BUILT_IN (old_decl
))
1210 /* Hide a built-in declaration. */
1211 DECL_DECLARED_CONSTEXPR_P (old_decl
)
1212 = DECL_DECLARED_CONSTEXPR_P (new_decl
);
1215 /* 7.1.5 [dcl.constexpr]
1216 Note: An explicit specialization can differ from the template
1217 declaration with respect to the constexpr specifier. */
1218 if (! DECL_TEMPLATE_SPECIALIZATION (old_decl
)
1219 && DECL_TEMPLATE_SPECIALIZATION (new_decl
))
1222 error_at (DECL_SOURCE_LOCATION (new_decl
),
1223 "redeclaration %qD differs in %<constexpr%> "
1224 "from previous declaration", new_decl
);
1225 inform (DECL_SOURCE_LOCATION (old_decl
),
1226 "previous declaration %qD", old_decl
);
1232 // If OLDDECL and NEWDECL are concept declarations with the same type
1233 // (i.e., and template parameters), but different requirements,
1234 // emit diagnostics and return true. Otherwise, return false.
1236 check_concept_refinement (tree olddecl
, tree newdecl
)
1238 if (!DECL_DECLARED_CONCEPT_P (olddecl
) || !DECL_DECLARED_CONCEPT_P (newdecl
))
1241 tree d1
= DECL_TEMPLATE_RESULT (olddecl
);
1242 tree d2
= DECL_TEMPLATE_RESULT (newdecl
);
1243 if (TREE_CODE (d1
) != TREE_CODE (d2
))
1246 tree t1
= TREE_TYPE (d1
);
1247 tree t2
= TREE_TYPE (d2
);
1248 if (TREE_CODE (d1
) == FUNCTION_DECL
)
1250 if (compparms (TYPE_ARG_TYPES (t1
), TYPE_ARG_TYPES (t2
))
1251 && comp_template_parms (DECL_TEMPLATE_PARMS (olddecl
),
1252 DECL_TEMPLATE_PARMS (newdecl
))
1253 && !equivalently_constrained (olddecl
, newdecl
))
1255 error ("cannot specialize concept %q#D", olddecl
);
1262 /* DECL is a redeclaration of a function or function template. If
1263 it does have default arguments issue a diagnostic. Note: this
1264 function is used to enforce the requirements in C++11 8.3.6 about
1265 no default arguments in redeclarations. */
1268 check_redeclaration_no_default_args (tree decl
)
1270 gcc_assert (DECL_DECLARES_FUNCTION_P (decl
));
1272 for (tree t
= FUNCTION_FIRST_USER_PARMTYPE (decl
);
1273 t
&& t
!= void_list_node
; t
= TREE_CHAIN (t
))
1274 if (TREE_PURPOSE (t
))
1276 permerror (DECL_SOURCE_LOCATION (decl
),
1277 "redeclaration of %q#D may not have default "
1283 /* NEWDECL is a redeclaration of a function or function template OLDDECL,
1284 in any case represented as FUNCTION_DECLs (the DECL_TEMPLATE_RESULTs of
1285 the TEMPLATE_DECLs in case of function templates). This function is used
1286 to enforce the final part of C++17 11.3.6/4, about a single declaration:
1287 "If a friend declaration specifies a default argument expression, that
1288 declaration shall be a definition and shall be the only declaration of
1289 the function or function template in the translation unit." */
1292 check_no_redeclaration_friend_default_args (tree olddecl
, tree newdecl
,
1293 bool olddecl_hidden_friend_p
)
1295 if (!olddecl_hidden_friend_p
&& !DECL_FRIEND_P (newdecl
))
1298 tree t1
= FUNCTION_FIRST_USER_PARMTYPE (olddecl
);
1299 tree t2
= FUNCTION_FIRST_USER_PARMTYPE (newdecl
);
1301 for (; t1
&& t1
!= void_list_node
;
1302 t1
= TREE_CHAIN (t1
), t2
= TREE_CHAIN (t2
))
1303 if ((olddecl_hidden_friend_p
&& TREE_PURPOSE (t1
))
1304 || (DECL_FRIEND_P (newdecl
) && TREE_PURPOSE (t2
)))
1306 if (permerror (DECL_SOURCE_LOCATION (newdecl
),
1307 "friend declaration of %q#D specifies default "
1308 "arguments and isn't the only declaration", newdecl
))
1309 inform (DECL_SOURCE_LOCATION (olddecl
),
1310 "previous declaration of %q#D", olddecl
);
1315 /* Merge tree bits that correspond to attributes noreturn, nothrow,
1316 const, malloc, and pure from NEWDECL with those of OLDDECL. */
1319 merge_attribute_bits (tree newdecl
, tree olddecl
)
1321 TREE_THIS_VOLATILE (newdecl
) |= TREE_THIS_VOLATILE (olddecl
);
1322 TREE_THIS_VOLATILE (olddecl
) |= TREE_THIS_VOLATILE (newdecl
);
1323 TREE_NOTHROW (newdecl
) |= TREE_NOTHROW (olddecl
);
1324 TREE_NOTHROW (olddecl
) |= TREE_NOTHROW (newdecl
);
1325 TREE_READONLY (newdecl
) |= TREE_READONLY (olddecl
);
1326 TREE_READONLY (olddecl
) |= TREE_READONLY (newdecl
);
1327 DECL_IS_MALLOC (newdecl
) |= DECL_IS_MALLOC (olddecl
);
1328 DECL_IS_MALLOC (olddecl
) |= DECL_IS_MALLOC (newdecl
);
1329 DECL_PURE_P (newdecl
) |= DECL_PURE_P (olddecl
);
1330 DECL_PURE_P (olddecl
) |= DECL_PURE_P (newdecl
);
1331 DECL_UNINLINABLE (newdecl
) |= DECL_UNINLINABLE (olddecl
);
1332 DECL_UNINLINABLE (olddecl
) |= DECL_UNINLINABLE (newdecl
);
1335 #define GNU_INLINE_P(fn) (DECL_DECLARED_INLINE_P (fn) \
1336 && lookup_attribute ("gnu_inline", \
1337 DECL_ATTRIBUTES (fn)))
1339 /* If NEWDECL is a redeclaration of OLDDECL, merge the declarations.
1340 If the redeclaration is invalid, a diagnostic is issued, and the
1341 error_mark_node is returned. Otherwise, OLDDECL is returned.
1343 If NEWDECL is not a redeclaration of OLDDECL, NULL_TREE is
1346 NEWDECL_IS_FRIEND is true if NEWDECL was declared as a friend. */
1349 duplicate_decls (tree newdecl
, tree olddecl
, bool newdecl_is_friend
)
1351 unsigned olddecl_uid
= DECL_UID (olddecl
);
1352 int olddecl_friend
= 0, types_match
= 0, hidden_friend
= 0;
1353 int olddecl_hidden_friend
= 0;
1354 int new_defines_function
= 0;
1355 tree new_template_info
;
1356 location_t olddecl_loc
= DECL_SOURCE_LOCATION (olddecl
);
1357 location_t newdecl_loc
= DECL_SOURCE_LOCATION (newdecl
);
1359 if (newdecl
== olddecl
)
1362 types_match
= decls_match (newdecl
, olddecl
);
1364 /* If either the type of the new decl or the type of the old decl is an
1365 error_mark_node, then that implies that we have already issued an
1366 error (earlier) for some bogus type specification, and in that case,
1367 it is rather pointless to harass the user with yet more error message
1368 about the same declaration, so just pretend the types match here. */
1369 if (TREE_TYPE (newdecl
) == error_mark_node
1370 || TREE_TYPE (olddecl
) == error_mark_node
)
1371 return error_mark_node
;
1373 if (DECL_NAME (newdecl
)
1374 && DECL_NAME (olddecl
)
1375 && UDLIT_OPER_P (DECL_NAME (newdecl
))
1376 && UDLIT_OPER_P (DECL_NAME (olddecl
)))
1378 if (TREE_CODE (newdecl
) == TEMPLATE_DECL
1379 && TREE_CODE (olddecl
) != TEMPLATE_DECL
1380 && check_raw_literal_operator (olddecl
))
1381 error_at (newdecl_loc
,
1382 "literal operator template %qD conflicts with"
1383 " raw literal operator %qD", newdecl
, olddecl
);
1384 else if (TREE_CODE (newdecl
) != TEMPLATE_DECL
1385 && TREE_CODE (olddecl
) == TEMPLATE_DECL
1386 && check_raw_literal_operator (newdecl
))
1387 error_at (newdecl_loc
,
1388 "raw literal operator %qD conflicts with"
1389 " literal operator template %qD", newdecl
, olddecl
);
1392 /* True to merge attributes between the declarations, false to
1393 set OLDDECL's attributes to those of NEWDECL (for template
1394 explicit specializations that specify their own attributes
1395 independent of those specified for the primary template). */
1396 const bool merge_attr
= (TREE_CODE (newdecl
) != FUNCTION_DECL
1397 || !DECL_TEMPLATE_SPECIALIZATION (newdecl
)
1398 || DECL_TEMPLATE_SPECIALIZATION (olddecl
));
1400 if (DECL_P (olddecl
)
1401 && TREE_CODE (newdecl
) == FUNCTION_DECL
1402 && TREE_CODE (olddecl
) == FUNCTION_DECL
1404 && diagnose_mismatched_attributes (olddecl
, newdecl
))
1406 if (DECL_INITIAL (olddecl
))
1407 inform (olddecl_loc
,
1408 "previous definition of %qD was here", olddecl
);
1410 inform (olddecl_loc
,
1411 "previous declaration of %qD was here", olddecl
);
1414 /* Check for redeclaration and other discrepancies. */
1415 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1416 && DECL_ARTIFICIAL (olddecl
))
1418 gcc_assert (!DECL_HIDDEN_FRIEND_P (olddecl
));
1419 if (TREE_CODE (newdecl
) != FUNCTION_DECL
)
1421 /* Avoid warnings redeclaring built-ins which have not been
1422 explicitly declared. */
1423 if (DECL_ANTICIPATED (olddecl
))
1425 if (TREE_PUBLIC (newdecl
)
1426 && CP_DECL_CONTEXT (newdecl
) == global_namespace
)
1427 warning_at (newdecl_loc
,
1428 OPT_Wbuiltin_declaration_mismatch
,
1429 "built-in function %qD declared as non-function",
1434 /* If you declare a built-in or predefined function name as static,
1435 the old definition is overridden, but optionally warn this was a
1436 bad choice of name. */
1437 if (! TREE_PUBLIC (newdecl
))
1439 warning_at (newdecl_loc
,
1441 DECL_BUILT_IN (olddecl
)
1442 ? G_("shadowing built-in function %q#D")
1443 : G_("shadowing library function %q#D"), olddecl
);
1444 /* Discard the old built-in function. */
1447 /* If the built-in is not ansi, then programs can override
1448 it even globally without an error. */
1449 else if (! DECL_BUILT_IN (olddecl
))
1450 warning_at (newdecl_loc
, 0,
1451 "library function %q#D redeclared as non-function %q#D",
1454 error_at (newdecl_loc
,
1455 "declaration of %q#D conflicts with built-in "
1456 "declaration %q#D", newdecl
, olddecl
);
1459 else if (DECL_OMP_DECLARE_REDUCTION_P (olddecl
))
1461 gcc_assert (DECL_OMP_DECLARE_REDUCTION_P (newdecl
));
1462 error_at (newdecl_loc
,
1463 "redeclaration of %<pragma omp declare reduction%>");
1464 inform (olddecl_loc
,
1465 "previous %<pragma omp declare reduction%> declaration");
1466 return error_mark_node
;
1468 else if (!types_match
)
1470 /* Avoid warnings redeclaring built-ins which have not been
1471 explicitly declared. */
1472 if (DECL_ANTICIPATED (olddecl
))
1476 /* A new declaration doesn't match a built-in one unless it
1477 is also extern "C". */
1478 gcc_assert (DECL_IS_BUILTIN (olddecl
));
1479 gcc_assert (DECL_EXTERN_C_P (olddecl
));
1480 if (!DECL_EXTERN_C_P (newdecl
))
1483 for (t1
= TYPE_ARG_TYPES (TREE_TYPE (newdecl
)),
1484 t2
= TYPE_ARG_TYPES (TREE_TYPE (olddecl
));
1486 t1
= TREE_CHAIN (t1
), t2
= TREE_CHAIN (t2
))
1490 /* FILE, tm types are not known at the time
1491 we create the builtins. */
1492 for (unsigned i
= 0;
1493 i
< sizeof (builtin_structptr_types
)
1494 / sizeof (builtin_structptr_type
);
1496 if (TREE_VALUE (t2
) == builtin_structptr_types
[i
].node
)
1498 tree t
= TREE_VALUE (t1
);
1501 && TYPE_IDENTIFIER (TREE_TYPE (t
))
1502 == get_identifier (builtin_structptr_types
[i
].str
)
1503 && compparms (TREE_CHAIN (t1
), TREE_CHAIN (t2
)))
1505 tree oldargs
= TYPE_ARG_TYPES (TREE_TYPE (olddecl
));
1507 TYPE_ARG_TYPES (TREE_TYPE (olddecl
))
1508 = TYPE_ARG_TYPES (TREE_TYPE (newdecl
));
1509 types_match
= decls_match (newdecl
, olddecl
);
1511 return duplicate_decls (newdecl
, olddecl
,
1513 TYPE_ARG_TYPES (TREE_TYPE (olddecl
)) = oldargs
;
1518 if (! same_type_p (TREE_VALUE (t1
), TREE_VALUE (t2
)))
1523 warning_at (newdecl_loc
,
1524 OPT_Wbuiltin_declaration_mismatch
,
1525 "declaration of %q#D conflicts with built-in "
1526 "declaration %q#D", newdecl
, olddecl
);
1528 else if ((DECL_EXTERN_C_P (newdecl
)
1529 && DECL_EXTERN_C_P (olddecl
))
1530 || compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl
)),
1531 TYPE_ARG_TYPES (TREE_TYPE (olddecl
))))
1533 /* Don't really override olddecl for __* prefixed builtins
1534 except for __[^b]*_chk, the compiler might be using those
1536 if (DECL_BUILT_IN (olddecl
))
1538 tree id
= DECL_NAME (olddecl
);
1539 const char *name
= IDENTIFIER_POINTER (id
);
1544 && (strncmp (name
+ 2, "builtin_",
1545 strlen ("builtin_")) == 0
1546 || (len
= strlen (name
)) <= strlen ("___chk")
1547 || memcmp (name
+ len
- strlen ("_chk"),
1548 "_chk", strlen ("_chk") + 1) != 0))
1550 if (DECL_INITIAL (newdecl
))
1552 error_at (newdecl_loc
,
1553 "definition of %q#D ambiguates built-in "
1554 "declaration %q#D", newdecl
, olddecl
);
1555 return error_mark_node
;
1557 if (permerror (newdecl_loc
,
1558 "new declaration %q#D ambiguates built-in"
1559 " declaration %q#D", newdecl
, olddecl
)
1561 inform (newdecl_loc
,
1562 "ignoring the %q#D declaration", newdecl
);
1563 return flag_permissive
? olddecl
: error_mark_node
;
1567 /* A near match; override the builtin. */
1569 if (TREE_PUBLIC (newdecl
))
1570 warning_at (newdecl_loc
,
1571 OPT_Wbuiltin_declaration_mismatch
,
1572 "new declaration %q#D ambiguates built-in "
1573 "declaration %q#D", newdecl
, olddecl
);
1575 warning (OPT_Wshadow
,
1576 DECL_BUILT_IN (olddecl
)
1577 ? G_("shadowing built-in function %q#D")
1578 : G_("shadowing library function %q#D"), olddecl
);
1581 /* Discard the old built-in function. */
1584 /* Replace the old RTL to avoid problems with inlining. */
1585 COPY_DECL_RTL (newdecl
, olddecl
);
1587 /* Even if the types match, prefer the new declarations type for
1588 built-ins which have not been explicitly declared, for
1589 exception lists, etc... */
1590 else if (DECL_IS_BUILTIN (olddecl
))
1592 tree type
= TREE_TYPE (newdecl
);
1593 tree attribs
= (*targetm
.merge_type_attributes
)
1594 (TREE_TYPE (olddecl
), type
);
1596 type
= cp_build_type_attribute_variant (type
, attribs
);
1597 TREE_TYPE (newdecl
) = TREE_TYPE (olddecl
) = type
;
1600 /* If a function is explicitly declared "throw ()", propagate that to
1601 the corresponding builtin. */
1602 if (DECL_BUILT_IN_CLASS (olddecl
) == BUILT_IN_NORMAL
1603 && DECL_ANTICIPATED (olddecl
)
1604 && TREE_NOTHROW (newdecl
)
1605 && !TREE_NOTHROW (olddecl
))
1607 enum built_in_function fncode
= DECL_FUNCTION_CODE (olddecl
);
1608 tree tmpdecl
= builtin_decl_explicit (fncode
);
1609 if (tmpdecl
&& tmpdecl
!= olddecl
&& types_match
)
1610 TREE_NOTHROW (tmpdecl
) = 1;
1613 /* Whether or not the builtin can throw exceptions has no
1614 bearing on this declarator. */
1615 TREE_NOTHROW (olddecl
) = 0;
1617 if (DECL_THIS_STATIC (newdecl
) && !DECL_THIS_STATIC (olddecl
))
1619 /* If a builtin function is redeclared as `static', merge
1620 the declarations, but make the original one static. */
1621 DECL_THIS_STATIC (olddecl
) = 1;
1622 TREE_PUBLIC (olddecl
) = 0;
1624 /* Make the old declaration consistent with the new one so
1625 that all remnants of the builtin-ness of this function
1626 will be banished. */
1627 SET_DECL_LANGUAGE (olddecl
, DECL_LANGUAGE (newdecl
));
1628 COPY_DECL_RTL (newdecl
, olddecl
);
1631 else if (TREE_CODE (olddecl
) != TREE_CODE (newdecl
))
1633 /* C++ Standard, 3.3, clause 4:
1634 "[Note: a namespace name or a class template name must be unique
1635 in its declarative region (7.3.2, clause 14). ]" */
1636 if (TREE_CODE (olddecl
) != NAMESPACE_DECL
1637 && TREE_CODE (newdecl
) != NAMESPACE_DECL
1638 && (TREE_CODE (olddecl
) != TEMPLATE_DECL
1639 || TREE_CODE (DECL_TEMPLATE_RESULT (olddecl
)) != TYPE_DECL
)
1640 && (TREE_CODE (newdecl
) != TEMPLATE_DECL
1641 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl
)) != TYPE_DECL
))
1643 if ((TREE_CODE (olddecl
) == TYPE_DECL
&& DECL_ARTIFICIAL (olddecl
)
1644 && TREE_CODE (newdecl
) != TYPE_DECL
)
1645 || (TREE_CODE (newdecl
) == TYPE_DECL
&& DECL_ARTIFICIAL (newdecl
)
1646 && TREE_CODE (olddecl
) != TYPE_DECL
))
1648 /* We do nothing special here, because C++ does such nasty
1649 things with TYPE_DECLs. Instead, just let the TYPE_DECL
1650 get shadowed, and know that if we need to find a TYPE_DECL
1651 for a given name, we can look in the IDENTIFIER_TYPE_VALUE
1652 slot of the identifier. */
1656 if ((TREE_CODE (newdecl
) == FUNCTION_DECL
1657 && DECL_FUNCTION_TEMPLATE_P (olddecl
))
1658 || (TREE_CODE (olddecl
) == FUNCTION_DECL
1659 && DECL_FUNCTION_TEMPLATE_P (newdecl
)))
1663 error ("%q#D redeclared as different kind of symbol", newdecl
);
1664 if (TREE_CODE (olddecl
) == TREE_LIST
)
1665 olddecl
= TREE_VALUE (olddecl
);
1666 inform (olddecl_loc
,
1667 "previous declaration %q#D", olddecl
);
1669 return error_mark_node
;
1671 else if (!types_match
)
1673 if (CP_DECL_CONTEXT (newdecl
) != CP_DECL_CONTEXT (olddecl
))
1674 /* These are certainly not duplicate declarations; they're
1675 from different scopes. */
1678 if (TREE_CODE (newdecl
) == TEMPLATE_DECL
)
1680 /* The name of a class template may not be declared to refer to
1681 any other template, class, function, object, namespace, value,
1682 or type in the same scope. */
1683 if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl
)) == TYPE_DECL
1684 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl
)) == TYPE_DECL
)
1686 error_at (newdecl_loc
,
1687 "conflicting declaration of template %q#D", newdecl
);
1688 inform (olddecl_loc
,
1689 "previous declaration %q#D", olddecl
);
1690 return error_mark_node
;
1692 else if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl
)) == FUNCTION_DECL
1693 && TREE_CODE (DECL_TEMPLATE_RESULT (newdecl
)) == FUNCTION_DECL
1694 && compparms (TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl
))),
1695 TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl
))))
1696 && comp_template_parms (DECL_TEMPLATE_PARMS (newdecl
),
1697 DECL_TEMPLATE_PARMS (olddecl
))
1698 /* Template functions can be disambiguated by
1700 && same_type_p (TREE_TYPE (TREE_TYPE (newdecl
)),
1701 TREE_TYPE (TREE_TYPE (olddecl
)))
1702 // Template functions can also be disambiguated by
1704 && equivalently_constrained (olddecl
, newdecl
))
1706 error_at (newdecl_loc
, "ambiguating new declaration %q#D",
1708 inform (olddecl_loc
,
1709 "old declaration %q#D", olddecl
);
1711 else if (check_concept_refinement (olddecl
, newdecl
))
1712 return error_mark_node
;
1715 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1717 if (DECL_EXTERN_C_P (newdecl
) && DECL_EXTERN_C_P (olddecl
))
1719 error_at (newdecl_loc
,
1720 "conflicting declaration of C function %q#D",
1722 inform (olddecl_loc
,
1723 "previous declaration %q#D", olddecl
);
1726 /* For function versions, params and types match, but they
1727 are not ambiguous. */
1728 else if ((!DECL_FUNCTION_VERSIONED (newdecl
)
1729 && !DECL_FUNCTION_VERSIONED (olddecl
))
1730 // The functions have the same parameter types.
1731 && compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl
)),
1732 TYPE_ARG_TYPES (TREE_TYPE (olddecl
)))
1733 // And the same constraints.
1734 && equivalently_constrained (newdecl
, olddecl
))
1736 error_at (newdecl_loc
,
1737 "ambiguating new declaration of %q#D", newdecl
);
1738 inform (olddecl_loc
,
1739 "old declaration %q#D", olddecl
);
1740 return error_mark_node
;
1747 error_at (newdecl_loc
, "conflicting declaration %q#D", newdecl
);
1748 inform (olddecl_loc
,
1749 "previous declaration as %q#D", olddecl
);
1750 return error_mark_node
;
1753 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
1754 && ((DECL_TEMPLATE_SPECIALIZATION (olddecl
)
1755 && (!DECL_TEMPLATE_INFO (newdecl
)
1756 || (DECL_TI_TEMPLATE (newdecl
)
1757 != DECL_TI_TEMPLATE (olddecl
))))
1758 || (DECL_TEMPLATE_SPECIALIZATION (newdecl
)
1759 && (!DECL_TEMPLATE_INFO (olddecl
)
1760 || (DECL_TI_TEMPLATE (olddecl
)
1761 != DECL_TI_TEMPLATE (newdecl
))))))
1762 /* It's OK to have a template specialization and a non-template
1763 with the same type, or to have specializations of two
1764 different templates with the same type. Note that if one is a
1765 specialization, and the other is an instantiation of the same
1766 template, that we do not exit at this point. That situation
1767 can occur if we instantiate a template class, and then
1768 specialize one of its methods. This situation is valid, but
1769 the declarations must be merged in the usual way. */
1771 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
1772 && ((DECL_TEMPLATE_INSTANTIATION (olddecl
)
1773 && !DECL_USE_TEMPLATE (newdecl
))
1774 || (DECL_TEMPLATE_INSTANTIATION (newdecl
)
1775 && !DECL_USE_TEMPLATE (olddecl
))))
1776 /* One of the declarations is a template instantiation, and the
1777 other is not a template at all. That's OK. */
1779 else if (TREE_CODE (newdecl
) == NAMESPACE_DECL
)
1781 /* In [namespace.alias] we have:
1783 In a declarative region, a namespace-alias-definition can be
1784 used to redefine a namespace-alias declared in that declarative
1785 region to refer only to the namespace to which it already
1788 Therefore, if we encounter a second alias directive for the same
1789 alias, we can just ignore the second directive. */
1790 if (DECL_NAMESPACE_ALIAS (newdecl
)
1791 && (DECL_NAMESPACE_ALIAS (newdecl
)
1792 == DECL_NAMESPACE_ALIAS (olddecl
)))
1795 /* Leave it to update_binding to merge or report error. */
1800 const char *errmsg
= redeclaration_error_message (newdecl
, olddecl
);
1803 error_at (newdecl_loc
, errmsg
, newdecl
);
1804 if (DECL_NAME (olddecl
) != NULL_TREE
)
1805 inform (olddecl_loc
,
1806 (DECL_INITIAL (olddecl
) && namespace_bindings_p ())
1807 ? G_("%q#D previously defined here")
1808 : G_("%q#D previously declared here"), olddecl
);
1809 return error_mark_node
;
1811 else if (TREE_CODE (olddecl
) == FUNCTION_DECL
1812 && DECL_INITIAL (olddecl
) != NULL_TREE
1813 && !prototype_p (TREE_TYPE (olddecl
))
1814 && prototype_p (TREE_TYPE (newdecl
)))
1816 /* Prototype decl follows defn w/o prototype. */
1817 if (warning_at (newdecl_loc
, 0,
1818 "prototype specified for %q#D", newdecl
))
1819 inform (olddecl_loc
,
1820 "previous non-prototype definition here");
1822 else if (VAR_OR_FUNCTION_DECL_P (olddecl
)
1823 && DECL_LANGUAGE (newdecl
) != DECL_LANGUAGE (olddecl
))
1826 If two declarations of the same function or object
1827 specify different linkage-specifications ..., the program
1828 is ill-formed.... Except for functions with C++ linkage,
1829 a function declaration without a linkage specification
1830 shall not precede the first linkage specification for
1831 that function. A function can be declared without a
1832 linkage specification after an explicit linkage
1833 specification has been seen; the linkage explicitly
1834 specified in the earlier declaration is not affected by
1835 such a function declaration.
1837 DR 563 raises the question why the restrictions on
1838 functions should not also apply to objects. Older
1839 versions of G++ silently ignore the linkage-specification
1847 which is clearly wrong. Therefore, we now treat objects
1849 if (current_lang_depth () == 0)
1851 /* There is no explicit linkage-specification, so we use
1852 the linkage from the previous declaration. */
1853 retrofit_lang_decl (newdecl
);
1854 SET_DECL_LANGUAGE (newdecl
, DECL_LANGUAGE (olddecl
));
1858 error_at (newdecl_loc
,
1859 "conflicting declaration of %q#D with %qL linkage",
1860 newdecl
, DECL_LANGUAGE (newdecl
));
1861 inform (olddecl_loc
,
1862 "previous declaration with %qL linkage",
1863 DECL_LANGUAGE (olddecl
));
1867 if (DECL_LANG_SPECIFIC (olddecl
) && DECL_USE_TEMPLATE (olddecl
))
1869 else if (TREE_CODE (olddecl
) == FUNCTION_DECL
)
1871 /* Note: free functions, as TEMPLATE_DECLs, are handled below. */
1872 if (DECL_FUNCTION_MEMBER_P (olddecl
)
1873 && (/* grokfndecl passes member function templates too
1874 as FUNCTION_DECLs. */
1875 DECL_TEMPLATE_INFO (olddecl
)
1877 Default arguments for a member function of a class
1878 template shall be specified on the initial declaration
1879 of the member function within the class template. */
1880 || CLASSTYPE_TEMPLATE_INFO (CP_DECL_CONTEXT (olddecl
))))
1881 check_redeclaration_no_default_args (newdecl
);
1884 tree t1
= FUNCTION_FIRST_USER_PARMTYPE (olddecl
);
1885 tree t2
= FUNCTION_FIRST_USER_PARMTYPE (newdecl
);
1888 for (; t1
&& t1
!= void_list_node
;
1889 t1
= TREE_CHAIN (t1
), t2
= TREE_CHAIN (t2
), i
++)
1890 if (TREE_PURPOSE (t1
) && TREE_PURPOSE (t2
))
1892 if (simple_cst_equal (TREE_PURPOSE (t1
),
1893 TREE_PURPOSE (t2
)) == 1)
1895 if (permerror (newdecl_loc
,
1896 "default argument given for parameter "
1897 "%d of %q#D", i
, newdecl
))
1898 inform (olddecl_loc
,
1899 "previous specification in %q#D here",
1904 error_at (newdecl_loc
,
1905 "default argument given for parameter %d "
1906 "of %q#D", i
, newdecl
);
1907 inform (olddecl_loc
,
1908 "previous specification in %q#D here",
1913 /* C++17 11.3.6/4: "If a friend declaration specifies a default
1914 argument expression, that declaration... shall be the only
1915 declaration of the function or function template in the
1916 translation unit." */
1917 check_no_redeclaration_friend_default_args
1918 (olddecl
, newdecl
, DECL_HIDDEN_FRIEND_P (olddecl
));
1923 /* Do not merge an implicit typedef with an explicit one. In:
1927 typedef class A A __attribute__ ((foo));
1929 the attribute should apply only to the typedef. */
1930 if (TREE_CODE (olddecl
) == TYPE_DECL
1931 && (DECL_IMPLICIT_TYPEDEF_P (olddecl
)
1932 || DECL_IMPLICIT_TYPEDEF_P (newdecl
)))
1935 /* If new decl is `static' and an `extern' was seen previously,
1937 warn_extern_redeclared_static (newdecl
, olddecl
);
1939 if (!validate_constexpr_redeclaration (olddecl
, newdecl
))
1940 return error_mark_node
;
1942 /* We have committed to returning 1 at this point. */
1943 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1945 /* Now that functions must hold information normally held
1946 by field decls, there is extra work to do so that
1947 declaration information does not get destroyed during
1949 if (DECL_VINDEX (olddecl
))
1950 DECL_VINDEX (newdecl
) = DECL_VINDEX (olddecl
);
1951 if (DECL_CONTEXT (olddecl
))
1952 DECL_CONTEXT (newdecl
) = DECL_CONTEXT (olddecl
);
1953 DECL_STATIC_CONSTRUCTOR (newdecl
) |= DECL_STATIC_CONSTRUCTOR (olddecl
);
1954 DECL_STATIC_DESTRUCTOR (newdecl
) |= DECL_STATIC_DESTRUCTOR (olddecl
);
1955 DECL_PURE_VIRTUAL_P (newdecl
) |= DECL_PURE_VIRTUAL_P (olddecl
);
1956 DECL_VIRTUAL_P (newdecl
) |= DECL_VIRTUAL_P (olddecl
);
1957 DECL_INVALID_OVERRIDER_P (newdecl
) |= DECL_INVALID_OVERRIDER_P (olddecl
);
1958 DECL_FINAL_P (newdecl
) |= DECL_FINAL_P (olddecl
);
1959 DECL_OVERRIDE_P (newdecl
) |= DECL_OVERRIDE_P (olddecl
);
1960 DECL_THIS_STATIC (newdecl
) |= DECL_THIS_STATIC (olddecl
);
1961 if (DECL_OVERLOADED_OPERATOR_P (olddecl
))
1962 DECL_OVERLOADED_OPERATOR_CODE_RAW (newdecl
)
1963 = DECL_OVERLOADED_OPERATOR_CODE_RAW (olddecl
);
1964 new_defines_function
= DECL_INITIAL (newdecl
) != NULL_TREE
;
1966 /* Optionally warn about more than one declaration for the same
1967 name, but don't warn about a function declaration followed by a
1969 if (warn_redundant_decls
&& ! DECL_ARTIFICIAL (olddecl
)
1970 && !(new_defines_function
&& DECL_INITIAL (olddecl
) == NULL_TREE
)
1971 /* Don't warn about extern decl followed by definition. */
1972 && !(DECL_EXTERNAL (olddecl
) && ! DECL_EXTERNAL (newdecl
))
1973 /* Don't warn about friends, let add_friend take care of it. */
1974 && ! (newdecl_is_friend
|| DECL_FRIEND_P (olddecl
))
1975 /* Don't warn about declaration followed by specialization. */
1976 && (! DECL_TEMPLATE_SPECIALIZATION (newdecl
)
1977 || DECL_TEMPLATE_SPECIALIZATION (olddecl
)))
1979 if (warning_at (newdecl_loc
,
1980 OPT_Wredundant_decls
,
1981 "redundant redeclaration of %qD in same scope",
1983 inform (olddecl_loc
,
1984 "previous declaration of %qD", olddecl
);
1987 if (!(DECL_TEMPLATE_INSTANTIATION (olddecl
)
1988 && DECL_TEMPLATE_SPECIALIZATION (newdecl
)))
1990 if (DECL_DELETED_FN (newdecl
))
1992 error_at (newdecl_loc
, "deleted definition of %qD", newdecl
);
1993 inform (olddecl_loc
,
1994 "previous declaration of %qD", olddecl
);
1996 DECL_DELETED_FN (newdecl
) |= DECL_DELETED_FN (olddecl
);
2000 /* Deal with C++: must preserve virtual function table size. */
2001 if (TREE_CODE (olddecl
) == TYPE_DECL
)
2003 tree newtype
= TREE_TYPE (newdecl
);
2004 tree oldtype
= TREE_TYPE (olddecl
);
2006 if (newtype
!= error_mark_node
&& oldtype
!= error_mark_node
2007 && TYPE_LANG_SPECIFIC (newtype
) && TYPE_LANG_SPECIFIC (oldtype
))
2008 CLASSTYPE_FRIEND_CLASSES (newtype
)
2009 = CLASSTYPE_FRIEND_CLASSES (oldtype
);
2011 DECL_ORIGINAL_TYPE (newdecl
) = DECL_ORIGINAL_TYPE (olddecl
);
2014 /* Copy all the DECL_... slots specified in the new decl except for
2015 any that we copy here from the old type. */
2017 DECL_ATTRIBUTES (newdecl
)
2018 = (*targetm
.merge_decl_attributes
) (olddecl
, newdecl
);
2020 DECL_ATTRIBUTES (olddecl
) = DECL_ATTRIBUTES (newdecl
);
2022 if (DECL_DECLARES_FUNCTION_P (olddecl
) && DECL_DECLARES_FUNCTION_P (newdecl
))
2024 olddecl_friend
= DECL_FRIEND_P (olddecl
);
2025 olddecl_hidden_friend
= DECL_HIDDEN_FRIEND_P (olddecl
);
2026 hidden_friend
= (DECL_ANTICIPATED (olddecl
)
2027 && DECL_HIDDEN_FRIEND_P (olddecl
)
2028 && newdecl_is_friend
);
2031 DECL_ANTICIPATED (olddecl
) = 0;
2032 DECL_HIDDEN_FRIEND_P (olddecl
) = 0;
2036 if (TREE_CODE (newdecl
) == TEMPLATE_DECL
)
2038 tree old_result
= DECL_TEMPLATE_RESULT (olddecl
);
2039 tree new_result
= DECL_TEMPLATE_RESULT (newdecl
);
2040 TREE_TYPE (olddecl
) = TREE_TYPE (old_result
);
2041 DECL_TEMPLATE_SPECIALIZATIONS (olddecl
)
2042 = chainon (DECL_TEMPLATE_SPECIALIZATIONS (olddecl
),
2043 DECL_TEMPLATE_SPECIALIZATIONS (newdecl
));
2045 DECL_ATTRIBUTES (old_result
)
2046 = (*targetm
.merge_decl_attributes
) (old_result
, new_result
);
2048 if (DECL_FUNCTION_TEMPLATE_P (newdecl
))
2050 if (DECL_SOURCE_LOCATION (newdecl
)
2051 != DECL_SOURCE_LOCATION (olddecl
))
2053 /* Per C++11 8.3.6/4, default arguments cannot be added in
2054 later declarations of a function template. */
2055 check_redeclaration_no_default_args (newdecl
);
2056 /* C++17 11.3.6/4: "If a friend declaration specifies a default
2057 argument expression, that declaration... shall be the only
2058 declaration of the function or function template in the
2059 translation unit." */
2060 check_no_redeclaration_friend_default_args
2061 (old_result
, new_result
, olddecl_hidden_friend
);
2064 check_default_args (newdecl
);
2066 if (GNU_INLINE_P (old_result
) != GNU_INLINE_P (new_result
)
2067 && DECL_INITIAL (new_result
))
2069 if (DECL_INITIAL (old_result
))
2070 DECL_UNINLINABLE (old_result
) = 1;
2072 DECL_UNINLINABLE (old_result
) = DECL_UNINLINABLE (new_result
);
2073 DECL_EXTERNAL (old_result
) = DECL_EXTERNAL (new_result
);
2074 DECL_NOT_REALLY_EXTERN (old_result
)
2075 = DECL_NOT_REALLY_EXTERN (new_result
);
2076 DECL_INTERFACE_KNOWN (old_result
)
2077 = DECL_INTERFACE_KNOWN (new_result
);
2078 DECL_DECLARED_INLINE_P (old_result
)
2079 = DECL_DECLARED_INLINE_P (new_result
);
2080 DECL_DISREGARD_INLINE_LIMITS (old_result
)
2081 |= DECL_DISREGARD_INLINE_LIMITS (new_result
);
2086 DECL_DECLARED_INLINE_P (old_result
)
2087 |= DECL_DECLARED_INLINE_P (new_result
);
2088 DECL_DISREGARD_INLINE_LIMITS (old_result
)
2089 |= DECL_DISREGARD_INLINE_LIMITS (new_result
);
2090 check_redeclaration_exception_specification (newdecl
, olddecl
);
2092 merge_attribute_bits (new_result
, old_result
);
2096 /* If the new declaration is a definition, update the file and
2097 line information on the declaration, and also make
2098 the old declaration the same definition. */
2099 if (DECL_INITIAL (new_result
) != NULL_TREE
)
2101 DECL_SOURCE_LOCATION (olddecl
)
2102 = DECL_SOURCE_LOCATION (old_result
)
2103 = DECL_SOURCE_LOCATION (newdecl
);
2104 DECL_INITIAL (old_result
) = DECL_INITIAL (new_result
);
2105 if (DECL_FUNCTION_TEMPLATE_P (newdecl
))
2108 DECL_ARGUMENTS (old_result
)
2109 = DECL_ARGUMENTS (new_result
);
2110 for (parm
= DECL_ARGUMENTS (old_result
); parm
;
2111 parm
= DECL_CHAIN (parm
))
2112 DECL_CONTEXT (parm
) = old_result
;
2121 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2122 check_redeclaration_exception_specification (newdecl
, olddecl
);
2124 /* Automatically handles default parameters. */
2125 tree oldtype
= TREE_TYPE (olddecl
);
2128 /* For typedefs use the old type, as the new type's DECL_NAME points
2129 at newdecl, which will be ggc_freed. */
2130 if (TREE_CODE (newdecl
) == TYPE_DECL
)
2132 /* But NEWTYPE might have an attribute, honor that. */
2133 tree tem
= TREE_TYPE (newdecl
);
2136 if (TYPE_USER_ALIGN (tem
))
2138 if (TYPE_ALIGN (tem
) > TYPE_ALIGN (newtype
))
2139 SET_TYPE_ALIGN (newtype
, TYPE_ALIGN (tem
));
2140 TYPE_USER_ALIGN (newtype
) = true;
2143 /* And remove the new type from the variants list. */
2144 if (TYPE_NAME (TREE_TYPE (newdecl
)) == newdecl
)
2146 tree remove
= TREE_TYPE (newdecl
);
2147 for (tree t
= TYPE_MAIN_VARIANT (remove
); ;
2148 t
= TYPE_NEXT_VARIANT (t
))
2149 if (TYPE_NEXT_VARIANT (t
) == remove
)
2151 TYPE_NEXT_VARIANT (t
) = TYPE_NEXT_VARIANT (remove
);
2156 else if (merge_attr
)
2157 newtype
= merge_types (TREE_TYPE (newdecl
), TREE_TYPE (olddecl
));
2159 newtype
= TREE_TYPE (newdecl
);
2161 if (VAR_P (newdecl
))
2163 DECL_THIS_EXTERN (newdecl
) |= DECL_THIS_EXTERN (olddecl
);
2164 /* For already initialized vars, TREE_READONLY could have been
2165 cleared in cp_finish_decl, because the var needs runtime
2166 initialization or destruction. Make sure not to set
2167 TREE_READONLY on it again. */
2168 if (DECL_INITIALIZED_P (olddecl
)
2169 && !DECL_EXTERNAL (olddecl
)
2170 && !TREE_READONLY (olddecl
))
2171 TREE_READONLY (newdecl
) = 0;
2172 DECL_INITIALIZED_P (newdecl
) |= DECL_INITIALIZED_P (olddecl
);
2173 DECL_NONTRIVIALLY_INITIALIZED_P (newdecl
)
2174 |= DECL_NONTRIVIALLY_INITIALIZED_P (olddecl
);
2175 if (DECL_DEPENDENT_INIT_P (olddecl
))
2176 SET_DECL_DEPENDENT_INIT_P (newdecl
, true);
2177 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (newdecl
)
2178 |= DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (olddecl
);
2179 if (DECL_CLASS_SCOPE_P (olddecl
))
2180 DECL_DECLARED_CONSTEXPR_P (newdecl
)
2181 |= DECL_DECLARED_CONSTEXPR_P (olddecl
);
2183 /* Merge the threadprivate attribute from OLDDECL into NEWDECL. */
2184 if (DECL_LANG_SPECIFIC (olddecl
)
2185 && CP_DECL_THREADPRIVATE_P (olddecl
))
2187 /* Allocate a LANG_SPECIFIC structure for NEWDECL, if needed. */
2188 retrofit_lang_decl (newdecl
);
2189 CP_DECL_THREADPRIVATE_P (newdecl
) = 1;
2193 /* An explicit specialization of a function template or of a member
2194 function of a class template can be declared transaction_safe
2195 independently of whether the corresponding template entity is declared
2196 transaction_safe. */
2197 if (flag_tm
&& TREE_CODE (newdecl
) == FUNCTION_DECL
2198 && DECL_TEMPLATE_INSTANTIATION (olddecl
)
2199 && DECL_TEMPLATE_SPECIALIZATION (newdecl
)
2200 && tx_safe_fn_type_p (newtype
)
2201 && !tx_safe_fn_type_p (TREE_TYPE (newdecl
)))
2202 newtype
= tx_unsafe_fn_variant (newtype
);
2204 TREE_TYPE (newdecl
) = TREE_TYPE (olddecl
) = newtype
;
2206 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2207 check_default_args (newdecl
);
2209 /* Lay the type out, unless already done. */
2210 if (! same_type_p (newtype
, oldtype
)
2211 && TREE_TYPE (newdecl
) != error_mark_node
2212 && !(processing_template_decl
&& uses_template_parms (newdecl
)))
2213 layout_type (TREE_TYPE (newdecl
));
2215 if ((VAR_P (newdecl
)
2216 || TREE_CODE (newdecl
) == PARM_DECL
2217 || TREE_CODE (newdecl
) == RESULT_DECL
2218 || TREE_CODE (newdecl
) == FIELD_DECL
2219 || TREE_CODE (newdecl
) == TYPE_DECL
)
2220 && !(processing_template_decl
&& uses_template_parms (newdecl
)))
2221 layout_decl (newdecl
, 0);
2223 /* Merge deprecatedness. */
2224 if (TREE_DEPRECATED (newdecl
))
2225 TREE_DEPRECATED (olddecl
) = 1;
2227 /* Preserve function specific target and optimization options */
2228 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2230 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl
)
2231 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl
))
2232 DECL_FUNCTION_SPECIFIC_TARGET (newdecl
)
2233 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl
);
2235 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl
)
2236 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl
))
2237 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl
)
2238 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl
);
2242 /* Merge the const type qualifier. */
2243 if (TREE_READONLY (newdecl
))
2244 TREE_READONLY (olddecl
) = 1;
2245 /* Merge the volatile type qualifier. */
2246 if (TREE_THIS_VOLATILE (newdecl
))
2247 TREE_THIS_VOLATILE (olddecl
) = 1;
2250 /* Merge the initialization information. */
2251 if (DECL_INITIAL (newdecl
) == NULL_TREE
2252 && DECL_INITIAL (olddecl
) != NULL_TREE
)
2254 DECL_INITIAL (newdecl
) = DECL_INITIAL (olddecl
);
2255 DECL_SOURCE_LOCATION (newdecl
) = DECL_SOURCE_LOCATION (olddecl
);
2256 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2258 DECL_SAVED_TREE (newdecl
) = DECL_SAVED_TREE (olddecl
);
2259 DECL_STRUCT_FUNCTION (newdecl
) = DECL_STRUCT_FUNCTION (olddecl
);
2263 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2265 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl
)
2266 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl
);
2267 DECL_NO_LIMIT_STACK (newdecl
) |= DECL_NO_LIMIT_STACK (olddecl
);
2268 DECL_IS_OPERATOR_NEW (newdecl
) |= DECL_IS_OPERATOR_NEW (olddecl
);
2269 DECL_LOOPING_CONST_OR_PURE_P (newdecl
)
2270 |= DECL_LOOPING_CONST_OR_PURE_P (olddecl
);
2273 merge_attribute_bits (newdecl
, olddecl
);
2276 /* Merge the noreturn bit. */
2277 TREE_THIS_VOLATILE (olddecl
) = TREE_THIS_VOLATILE (newdecl
);
2278 TREE_READONLY (olddecl
) = TREE_READONLY (newdecl
);
2279 TREE_NOTHROW (olddecl
) = TREE_NOTHROW (newdecl
);
2280 DECL_IS_MALLOC (olddecl
) = DECL_IS_MALLOC (newdecl
);
2281 DECL_PURE_P (olddecl
) = DECL_PURE_P (newdecl
);
2283 /* Keep the old RTL. */
2284 COPY_DECL_RTL (olddecl
, newdecl
);
2286 else if (VAR_P (newdecl
)
2287 && (DECL_SIZE (olddecl
) || !DECL_SIZE (newdecl
)))
2289 /* Keep the old RTL. We cannot keep the old RTL if the old
2290 declaration was for an incomplete object and the new
2291 declaration is not since many attributes of the RTL will
2293 COPY_DECL_RTL (olddecl
, newdecl
);
2296 /* If cannot merge, then use the new type and qualifiers,
2297 and don't preserve the old rtl. */
2300 /* Clean out any memory we had of the old declaration. */
2301 tree oldstatic
= value_member (olddecl
, static_aggregates
);
2303 TREE_VALUE (oldstatic
) = error_mark_node
;
2305 TREE_TYPE (olddecl
) = TREE_TYPE (newdecl
);
2306 TREE_READONLY (olddecl
) = TREE_READONLY (newdecl
);
2307 TREE_THIS_VOLATILE (olddecl
) = TREE_THIS_VOLATILE (newdecl
);
2308 TREE_NOTHROW (olddecl
) = TREE_NOTHROW (newdecl
);
2309 TREE_SIDE_EFFECTS (olddecl
) = TREE_SIDE_EFFECTS (newdecl
);
2312 /* Merge the storage class information. */
2313 merge_weak (newdecl
, olddecl
);
2315 DECL_DEFER_OUTPUT (newdecl
) |= DECL_DEFER_OUTPUT (olddecl
);
2316 TREE_PUBLIC (newdecl
) = TREE_PUBLIC (olddecl
);
2317 TREE_STATIC (olddecl
) = TREE_STATIC (newdecl
) |= TREE_STATIC (olddecl
);
2318 if (! DECL_EXTERNAL (olddecl
))
2319 DECL_EXTERNAL (newdecl
) = 0;
2320 if (! DECL_COMDAT (olddecl
))
2321 DECL_COMDAT (newdecl
) = 0;
2323 new_template_info
= NULL_TREE
;
2324 if (DECL_LANG_SPECIFIC (newdecl
) && DECL_LANG_SPECIFIC (olddecl
))
2326 bool new_redefines_gnu_inline
= false;
2328 if (new_defines_function
2329 && ((DECL_INTERFACE_KNOWN (olddecl
)
2330 && TREE_CODE (olddecl
) == FUNCTION_DECL
)
2331 || (TREE_CODE (olddecl
) == TEMPLATE_DECL
2332 && (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl
))
2333 == FUNCTION_DECL
))))
2337 if (TREE_CODE (fn
) == TEMPLATE_DECL
)
2338 fn
= DECL_TEMPLATE_RESULT (olddecl
);
2340 new_redefines_gnu_inline
= GNU_INLINE_P (fn
) && DECL_INITIAL (fn
);
2343 if (!new_redefines_gnu_inline
)
2345 DECL_INTERFACE_KNOWN (newdecl
) |= DECL_INTERFACE_KNOWN (olddecl
);
2346 DECL_NOT_REALLY_EXTERN (newdecl
) |= DECL_NOT_REALLY_EXTERN (olddecl
);
2347 DECL_COMDAT (newdecl
) |= DECL_COMDAT (olddecl
);
2349 DECL_TEMPLATE_INSTANTIATED (newdecl
)
2350 |= DECL_TEMPLATE_INSTANTIATED (olddecl
);
2351 DECL_ODR_USED (newdecl
) |= DECL_ODR_USED (olddecl
);
2353 /* If the OLDDECL is an instantiation and/or specialization,
2354 then the NEWDECL must be too. But, it may not yet be marked
2355 as such if the caller has created NEWDECL, but has not yet
2356 figured out that it is a redeclaration. */
2357 if (!DECL_USE_TEMPLATE (newdecl
))
2358 DECL_USE_TEMPLATE (newdecl
) = DECL_USE_TEMPLATE (olddecl
);
2360 /* Don't really know how much of the language-specific
2361 values we should copy from old to new. */
2362 DECL_IN_AGGR_P (newdecl
) = DECL_IN_AGGR_P (olddecl
);
2363 DECL_REPO_AVAILABLE_P (newdecl
) = DECL_REPO_AVAILABLE_P (olddecl
);
2364 DECL_INITIALIZED_IN_CLASS_P (newdecl
)
2365 |= DECL_INITIALIZED_IN_CLASS_P (olddecl
);
2367 if (LANG_DECL_HAS_MIN (newdecl
))
2369 DECL_LANG_SPECIFIC (newdecl
)->u
.min
.u2
=
2370 DECL_LANG_SPECIFIC (olddecl
)->u
.min
.u2
;
2371 if (DECL_TEMPLATE_INFO (newdecl
))
2373 new_template_info
= DECL_TEMPLATE_INFO (newdecl
);
2374 if (DECL_TEMPLATE_INSTANTIATION (olddecl
)
2375 && DECL_TEMPLATE_SPECIALIZATION (newdecl
))
2376 /* Remember the presence of explicit specialization args. */
2377 TINFO_USED_TEMPLATE_ID (DECL_TEMPLATE_INFO (olddecl
))
2378 = TINFO_USED_TEMPLATE_ID (new_template_info
);
2380 DECL_TEMPLATE_INFO (newdecl
) = DECL_TEMPLATE_INFO (olddecl
);
2382 /* Only functions have these fields. */
2383 if (DECL_DECLARES_FUNCTION_P (newdecl
))
2385 DECL_NONCONVERTING_P (newdecl
) = DECL_NONCONVERTING_P (olddecl
);
2386 DECL_BEFRIENDING_CLASSES (newdecl
)
2387 = chainon (DECL_BEFRIENDING_CLASSES (newdecl
),
2388 DECL_BEFRIENDING_CLASSES (olddecl
));
2389 /* DECL_THUNKS is only valid for virtual functions,
2390 otherwise it is a DECL_FRIEND_CONTEXT. */
2391 if (DECL_VIRTUAL_P (newdecl
))
2392 SET_DECL_THUNKS (newdecl
, DECL_THUNKS (olddecl
));
2394 /* Only variables have this field. */
2395 else if (VAR_P (newdecl
)
2396 && VAR_HAD_UNKNOWN_BOUND (olddecl
))
2397 SET_VAR_HAD_UNKNOWN_BOUND (newdecl
);
2400 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2404 /* Merge parameter attributes. */
2405 tree oldarg
, newarg
;
2406 for (oldarg
= DECL_ARGUMENTS(olddecl
),
2407 newarg
= DECL_ARGUMENTS(newdecl
);
2409 oldarg
= DECL_CHAIN(oldarg
), newarg
= DECL_CHAIN(newarg
)) {
2410 DECL_ATTRIBUTES (newarg
)
2411 = (*targetm
.merge_decl_attributes
) (oldarg
, newarg
);
2412 DECL_ATTRIBUTES (oldarg
) = DECL_ATTRIBUTES (newarg
);
2415 if (DECL_TEMPLATE_INSTANTIATION (olddecl
)
2416 && !DECL_TEMPLATE_INSTANTIATION (newdecl
))
2418 /* If newdecl is not a specialization, then it is not a
2419 template-related function at all. And that means that we
2420 should have exited above, returning 0. */
2421 gcc_assert (DECL_TEMPLATE_SPECIALIZATION (newdecl
));
2423 if (DECL_ODR_USED (olddecl
))
2424 /* From [temp.expl.spec]:
2426 If a template, a member template or the member of a class
2427 template is explicitly specialized then that
2428 specialization shall be declared before the first use of
2429 that specialization that would cause an implicit
2430 instantiation to take place, in every translation unit in
2431 which such a use occurs. */
2432 error ("explicit specialization of %qD after first use",
2435 SET_DECL_TEMPLATE_SPECIALIZATION (olddecl
);
2436 DECL_COMDAT (newdecl
) = (TREE_PUBLIC (newdecl
)
2437 && DECL_DECLARED_INLINE_P (newdecl
));
2439 /* Don't propagate visibility from the template to the
2440 specialization here. We'll do that in determine_visibility if
2442 DECL_VISIBILITY_SPECIFIED (olddecl
) = 0;
2444 /* [temp.expl.spec/14] We don't inline explicit specialization
2445 just because the primary template says so. */
2446 gcc_assert (!merge_attr
);
2448 DECL_DECLARED_INLINE_P (olddecl
)
2449 = DECL_DECLARED_INLINE_P (newdecl
);
2451 DECL_DISREGARD_INLINE_LIMITS (olddecl
)
2452 = DECL_DISREGARD_INLINE_LIMITS (newdecl
);
2454 DECL_UNINLINABLE (olddecl
) = DECL_UNINLINABLE (newdecl
);
2456 else if (new_defines_function
&& DECL_INITIAL (olddecl
))
2458 /* Never inline re-defined extern inline functions.
2459 FIXME: this could be better handled by keeping both
2460 function as separate declarations. */
2461 DECL_UNINLINABLE (newdecl
) = 1;
2465 if (DECL_PENDING_INLINE_P (olddecl
))
2467 DECL_PENDING_INLINE_P (newdecl
) = 1;
2468 DECL_PENDING_INLINE_INFO (newdecl
)
2469 = DECL_PENDING_INLINE_INFO (olddecl
);
2471 else if (DECL_PENDING_INLINE_P (newdecl
))
2473 else if (DECL_SAVED_FUNCTION_DATA (newdecl
) == NULL
)
2474 DECL_SAVED_FUNCTION_DATA (newdecl
)
2475 = DECL_SAVED_FUNCTION_DATA (olddecl
);
2477 DECL_DECLARED_INLINE_P (newdecl
) |= DECL_DECLARED_INLINE_P (olddecl
);
2479 DECL_UNINLINABLE (newdecl
) = DECL_UNINLINABLE (olddecl
)
2480 = (DECL_UNINLINABLE (newdecl
) || DECL_UNINLINABLE (olddecl
));
2482 DECL_DISREGARD_INLINE_LIMITS (newdecl
)
2483 = DECL_DISREGARD_INLINE_LIMITS (olddecl
)
2484 = (DECL_DISREGARD_INLINE_LIMITS (newdecl
)
2485 || DECL_DISREGARD_INLINE_LIMITS (olddecl
));
2488 /* Preserve abstractness on cloned [cd]tors. */
2489 DECL_ABSTRACT_P (newdecl
) = DECL_ABSTRACT_P (olddecl
);
2491 /* Update newdecl's parms to point at olddecl. */
2492 for (parm
= DECL_ARGUMENTS (newdecl
); parm
;
2493 parm
= DECL_CHAIN (parm
))
2494 DECL_CONTEXT (parm
) = olddecl
;
2498 SET_DECL_LANGUAGE (olddecl
, DECL_LANGUAGE (newdecl
));
2499 COPY_DECL_ASSEMBLER_NAME (newdecl
, olddecl
);
2500 COPY_DECL_RTL (newdecl
, olddecl
);
2502 if (! types_match
|| new_defines_function
)
2504 /* These need to be copied so that the names are available.
2505 Note that if the types do match, we'll preserve inline
2506 info and other bits, but if not, we won't. */
2507 DECL_ARGUMENTS (olddecl
) = DECL_ARGUMENTS (newdecl
);
2508 DECL_RESULT (olddecl
) = DECL_RESULT (newdecl
);
2510 /* If redeclaring a builtin function, it stays built in
2511 if newdecl is a gnu_inline definition, or if newdecl is just
2513 if (DECL_BUILT_IN (olddecl
)
2514 && (new_defines_function
? GNU_INLINE_P (newdecl
) : types_match
))
2516 DECL_BUILT_IN_CLASS (newdecl
) = DECL_BUILT_IN_CLASS (olddecl
);
2517 DECL_FUNCTION_CODE (newdecl
) = DECL_FUNCTION_CODE (olddecl
);
2518 /* If we're keeping the built-in definition, keep the rtl,
2519 regardless of declaration matches. */
2520 COPY_DECL_RTL (olddecl
, newdecl
);
2521 if (DECL_BUILT_IN_CLASS (newdecl
) == BUILT_IN_NORMAL
)
2523 enum built_in_function fncode
= DECL_FUNCTION_CODE (newdecl
);
2526 /* If a compatible prototype of these builtin functions
2527 is seen, assume the runtime implements it with the
2528 expected semantics. */
2529 case BUILT_IN_STPCPY
:
2530 if (builtin_decl_explicit_p (fncode
))
2531 set_builtin_decl_implicit_p (fncode
, true);
2534 if (builtin_decl_explicit_p (fncode
))
2535 set_builtin_decl_declared_p (fncode
, true);
2540 copy_attributes_to_builtin (newdecl
);
2542 if (new_defines_function
)
2543 /* If defining a function declared with other language
2544 linkage, use the previously declared language linkage. */
2545 SET_DECL_LANGUAGE (newdecl
, DECL_LANGUAGE (olddecl
));
2546 else if (types_match
)
2548 DECL_RESULT (newdecl
) = DECL_RESULT (olddecl
);
2549 /* Don't clear out the arguments if we're just redeclaring a
2551 if (DECL_ARGUMENTS (olddecl
))
2552 DECL_ARGUMENTS (newdecl
) = DECL_ARGUMENTS (olddecl
);
2555 else if (TREE_CODE (newdecl
) == NAMESPACE_DECL
)
2556 NAMESPACE_LEVEL (newdecl
) = NAMESPACE_LEVEL (olddecl
);
2558 /* Now preserve various other info from the definition. */
2559 TREE_ADDRESSABLE (newdecl
) = TREE_ADDRESSABLE (olddecl
);
2560 TREE_ASM_WRITTEN (newdecl
) = TREE_ASM_WRITTEN (olddecl
);
2561 DECL_COMMON (newdecl
) = DECL_COMMON (olddecl
);
2562 COPY_DECL_ASSEMBLER_NAME (olddecl
, newdecl
);
2564 /* Warn about conflicting visibility specifications. */
2565 if (DECL_VISIBILITY_SPECIFIED (olddecl
)
2566 && DECL_VISIBILITY_SPECIFIED (newdecl
)
2567 && DECL_VISIBILITY (newdecl
) != DECL_VISIBILITY (olddecl
))
2569 if (warning_at (newdecl_loc
, OPT_Wattributes
,
2570 "%qD: visibility attribute ignored because it "
2571 "conflicts with previous declaration", newdecl
))
2572 inform (olddecl_loc
,
2573 "previous declaration of %qD", olddecl
);
2575 /* Choose the declaration which specified visibility. */
2576 if (DECL_VISIBILITY_SPECIFIED (olddecl
))
2578 DECL_VISIBILITY (newdecl
) = DECL_VISIBILITY (olddecl
);
2579 DECL_VISIBILITY_SPECIFIED (newdecl
) = 1;
2581 /* Init priority used to be merged from newdecl to olddecl by the memcpy,
2582 so keep this behavior. */
2583 if (VAR_P (newdecl
) && DECL_HAS_INIT_PRIORITY_P (newdecl
))
2585 SET_DECL_INIT_PRIORITY (olddecl
, DECL_INIT_PRIORITY (newdecl
));
2586 DECL_HAS_INIT_PRIORITY_P (olddecl
) = 1;
2588 /* Likewise for DECL_ALIGN, DECL_USER_ALIGN and DECL_PACKED. */
2589 if (DECL_ALIGN (olddecl
) > DECL_ALIGN (newdecl
))
2591 SET_DECL_ALIGN (newdecl
, DECL_ALIGN (olddecl
));
2592 DECL_USER_ALIGN (newdecl
) |= DECL_USER_ALIGN (olddecl
);
2594 DECL_USER_ALIGN (olddecl
) = DECL_USER_ALIGN (newdecl
);
2595 if (DECL_WARN_IF_NOT_ALIGN (olddecl
)
2596 > DECL_WARN_IF_NOT_ALIGN (newdecl
))
2597 SET_DECL_WARN_IF_NOT_ALIGN (newdecl
,
2598 DECL_WARN_IF_NOT_ALIGN (olddecl
));
2599 if (TREE_CODE (newdecl
) == FIELD_DECL
)
2600 DECL_PACKED (olddecl
) = DECL_PACKED (newdecl
);
2602 /* The DECL_LANG_SPECIFIC information in OLDDECL will be replaced
2603 with that from NEWDECL below. */
2604 if (DECL_LANG_SPECIFIC (olddecl
))
2606 gcc_assert (DECL_LANG_SPECIFIC (olddecl
)
2607 != DECL_LANG_SPECIFIC (newdecl
));
2608 ggc_free (DECL_LANG_SPECIFIC (olddecl
));
2611 /* Merge the USED information. */
2612 if (TREE_USED (olddecl
))
2613 TREE_USED (newdecl
) = 1;
2614 else if (TREE_USED (newdecl
))
2615 TREE_USED (olddecl
) = 1;
2616 if (VAR_P (newdecl
))
2618 if (DECL_READ_P (olddecl
))
2619 DECL_READ_P (newdecl
) = 1;
2620 else if (DECL_READ_P (newdecl
))
2621 DECL_READ_P (olddecl
) = 1;
2623 if (DECL_PRESERVE_P (olddecl
))
2624 DECL_PRESERVE_P (newdecl
) = 1;
2625 else if (DECL_PRESERVE_P (newdecl
))
2626 DECL_PRESERVE_P (olddecl
) = 1;
2628 /* Merge the DECL_FUNCTION_VERSIONED information. newdecl will be copied
2629 to olddecl and deleted. */
2630 if (TREE_CODE (newdecl
) == FUNCTION_DECL
2631 && DECL_FUNCTION_VERSIONED (olddecl
))
2633 /* Set the flag for newdecl so that it gets copied to olddecl. */
2634 DECL_FUNCTION_VERSIONED (newdecl
) = 1;
2635 /* newdecl will be purged after copying to olddecl and is no longer
2637 cgraph_node::delete_function_version_by_decl (newdecl
);
2640 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2643 struct symtab_node
*snode
= symtab_node::get (olddecl
);
2645 function_size
= sizeof (struct tree_decl_common
);
2647 memcpy ((char *) olddecl
+ sizeof (struct tree_common
),
2648 (char *) newdecl
+ sizeof (struct tree_common
),
2649 function_size
- sizeof (struct tree_common
));
2651 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
2652 (char *) newdecl
+ sizeof (struct tree_decl_common
),
2653 sizeof (struct tree_function_decl
) - sizeof (struct tree_decl_common
));
2655 /* Preserve symtab node mapping. */
2656 olddecl
->decl_with_vis
.symtab_node
= snode
;
2658 if (new_template_info
)
2659 /* If newdecl is a template instantiation, it is possible that
2660 the following sequence of events has occurred:
2662 o A friend function was declared in a class template. The
2663 class template was instantiated.
2665 o The instantiation of the friend declaration was
2666 recorded on the instantiation list, and is newdecl.
2668 o Later, however, instantiate_class_template called pushdecl
2669 on the newdecl to perform name injection. But, pushdecl in
2670 turn called duplicate_decls when it discovered that another
2671 declaration of a global function with the same name already
2674 o Here, in duplicate_decls, we decided to clobber newdecl.
2676 If we're going to do that, we'd better make sure that
2677 olddecl, and not newdecl, is on the list of
2678 instantiations so that if we try to do the instantiation
2679 again we won't get the clobbered declaration. */
2680 reregister_specialization (newdecl
,
2686 size_t size
= tree_code_size (TREE_CODE (newdecl
));
2688 memcpy ((char *) olddecl
+ sizeof (struct tree_common
),
2689 (char *) newdecl
+ sizeof (struct tree_common
),
2690 sizeof (struct tree_decl_common
) - sizeof (struct tree_common
));
2691 switch (TREE_CODE (newdecl
))
2701 struct symtab_node
*snode
= NULL
;
2704 && (TREE_STATIC (olddecl
) || TREE_PUBLIC (olddecl
)
2705 || DECL_EXTERNAL (olddecl
)))
2706 snode
= symtab_node::get (olddecl
);
2707 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
2708 (char *) newdecl
+ sizeof (struct tree_decl_common
),
2709 size
- sizeof (struct tree_decl_common
)
2710 + TREE_CODE_LENGTH (TREE_CODE (newdecl
)) * sizeof (char *));
2711 if (VAR_P (newdecl
))
2712 olddecl
->decl_with_vis
.symtab_node
= snode
;
2716 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
2717 (char *) newdecl
+ sizeof (struct tree_decl_common
),
2718 sizeof (struct tree_decl_non_common
) - sizeof (struct tree_decl_common
)
2719 + TREE_CODE_LENGTH (TREE_CODE (newdecl
)) * sizeof (char *));
2724 if (VAR_OR_FUNCTION_DECL_P (newdecl
))
2726 if (DECL_EXTERNAL (olddecl
)
2727 || TREE_PUBLIC (olddecl
)
2728 || TREE_STATIC (olddecl
))
2730 /* Merge the section attribute.
2731 We want to issue an error if the sections conflict but that must be
2732 done later in decl_attributes since we are called before attributes
2734 if (DECL_SECTION_NAME (newdecl
) != NULL
)
2735 set_decl_section_name (olddecl
, DECL_SECTION_NAME (newdecl
));
2737 if (DECL_ONE_ONLY (newdecl
))
2739 struct symtab_node
*oldsym
, *newsym
;
2740 if (TREE_CODE (olddecl
) == FUNCTION_DECL
)
2741 oldsym
= cgraph_node::get_create (olddecl
);
2743 oldsym
= varpool_node::get_create (olddecl
);
2744 newsym
= symtab_node::get (newdecl
);
2745 oldsym
->set_comdat_group (newsym
->get_comdat_group ());
2750 && CP_DECL_THREAD_LOCAL_P (newdecl
))
2752 CP_DECL_THREAD_LOCAL_P (olddecl
) = true;
2753 if (!processing_template_decl
)
2754 set_decl_tls_model (olddecl
, DECL_TLS_MODEL (newdecl
));
2758 DECL_UID (olddecl
) = olddecl_uid
;
2760 DECL_FRIEND_P (olddecl
) = 1;
2763 DECL_ANTICIPATED (olddecl
) = 1;
2764 DECL_HIDDEN_FRIEND_P (olddecl
) = 1;
2767 /* NEWDECL contains the merged attribute lists.
2768 Update OLDDECL to be the same. */
2769 DECL_ATTRIBUTES (olddecl
) = DECL_ATTRIBUTES (newdecl
);
2771 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2772 so that encode_section_info has a chance to look at the new decl
2773 flags and attributes. */
2774 if (DECL_RTL_SET_P (olddecl
)
2775 && (TREE_CODE (olddecl
) == FUNCTION_DECL
2777 && TREE_STATIC (olddecl
))))
2778 make_decl_rtl (olddecl
);
2780 /* The NEWDECL will no longer be needed. Because every out-of-class
2781 declaration of a member results in a call to duplicate_decls,
2782 freeing these nodes represents in a significant savings.
2784 Before releasing the node, be sore to remove function from symbol
2785 table that might have been inserted there to record comdat group.
2786 Be sure to however do not free DECL_STRUCT_FUNCTION because this
2787 structure is shared in between newdecl and oldecl. */
2788 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2789 DECL_STRUCT_FUNCTION (newdecl
) = NULL
;
2790 if (VAR_OR_FUNCTION_DECL_P (newdecl
))
2792 struct symtab_node
*snode
= symtab_node::get (newdecl
);
2797 /* Remove the associated constraints for newdecl, if any, before
2798 reclaiming memory. */
2800 remove_constraints (newdecl
);
2807 /* Return zero if the declaration NEWDECL is valid
2808 when the declaration OLDDECL (assumed to be for the same name)
2809 has already been seen.
2810 Otherwise return an error message format string with a %s
2811 where the identifier should go. */
2814 redeclaration_error_message (tree newdecl
, tree olddecl
)
2816 if (TREE_CODE (newdecl
) == TYPE_DECL
)
2818 /* Because C++ can put things into name space for free,
2819 constructs like "typedef struct foo { ... } foo"
2820 would look like an erroneous redeclaration. */
2821 if (same_type_p (TREE_TYPE (newdecl
), TREE_TYPE (olddecl
)))
2824 return G_("redefinition of %q#D");
2826 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2828 /* If this is a pure function, its olddecl will actually be
2829 the original initialization to `0' (which we force to call
2830 abort()). Don't complain about redefinition in this case. */
2831 if (DECL_LANG_SPECIFIC (olddecl
) && DECL_PURE_VIRTUAL_P (olddecl
)
2832 && DECL_INITIAL (olddecl
) == NULL_TREE
)
2835 /* If both functions come from different namespaces, this is not
2836 a redeclaration - this is a conflict with a used function. */
2837 if (DECL_NAMESPACE_SCOPE_P (olddecl
)
2838 && DECL_CONTEXT (olddecl
) != DECL_CONTEXT (newdecl
)
2839 && ! decls_match (olddecl
, newdecl
))
2840 return G_("%qD conflicts with used function");
2842 /* We'll complain about linkage mismatches in
2843 warn_extern_redeclared_static. */
2845 /* Defining the same name twice is no good. */
2846 if (decl_defined_p (olddecl
)
2847 && decl_defined_p (newdecl
))
2849 if (DECL_NAME (olddecl
) == NULL_TREE
)
2850 return G_("%q#D not declared in class");
2851 else if (!GNU_INLINE_P (olddecl
)
2852 || GNU_INLINE_P (newdecl
))
2853 return G_("redefinition of %q#D");
2856 if (DECL_DECLARED_INLINE_P (olddecl
) && DECL_DECLARED_INLINE_P (newdecl
))
2858 bool olda
= GNU_INLINE_P (olddecl
);
2859 bool newa
= GNU_INLINE_P (newdecl
);
2864 return G_("%q+D redeclared inline with "
2865 "%<gnu_inline%> attribute");
2867 return G_("%q+D redeclared inline without "
2868 "%<gnu_inline%> attribute");
2872 check_abi_tag_redeclaration
2873 (olddecl
, lookup_attribute ("abi_tag", DECL_ATTRIBUTES (olddecl
)),
2874 lookup_attribute ("abi_tag", DECL_ATTRIBUTES (newdecl
)));
2878 else if (TREE_CODE (newdecl
) == TEMPLATE_DECL
)
2882 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl
)) == TYPE_DECL
)
2884 if (COMPLETE_TYPE_P (TREE_TYPE (newdecl
))
2885 && COMPLETE_TYPE_P (TREE_TYPE (olddecl
)))
2886 return G_("redefinition of %q#D");
2890 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl
)) != FUNCTION_DECL
2891 || (DECL_TEMPLATE_RESULT (newdecl
)
2892 == DECL_TEMPLATE_RESULT (olddecl
)))
2895 nt
= DECL_TEMPLATE_RESULT (newdecl
);
2896 if (DECL_TEMPLATE_INFO (nt
))
2897 nt
= DECL_TEMPLATE_RESULT (template_for_substitution (nt
));
2898 ot
= DECL_TEMPLATE_RESULT (olddecl
);
2899 if (DECL_TEMPLATE_INFO (ot
))
2900 ot
= DECL_TEMPLATE_RESULT (template_for_substitution (ot
));
2901 if (DECL_INITIAL (nt
) && DECL_INITIAL (ot
)
2902 && (!GNU_INLINE_P (ot
) || GNU_INLINE_P (nt
)))
2903 return G_("redefinition of %q#D");
2905 if (DECL_DECLARED_INLINE_P (ot
) && DECL_DECLARED_INLINE_P (nt
))
2907 bool olda
= GNU_INLINE_P (ot
);
2908 bool newa
= GNU_INLINE_P (nt
);
2913 return G_("%q+D redeclared inline with "
2914 "%<gnu_inline%> attribute");
2916 return G_("%q+D redeclared inline without "
2917 "%<gnu_inline%> attribute");
2921 /* Core issue #226 (C++0x):
2923 If a friend function template declaration specifies a
2924 default template-argument, that declaration shall be a
2925 definition and shall be the only declaration of the
2926 function template in the translation unit. */
2927 if ((cxx_dialect
!= cxx98
)
2928 && TREE_CODE (ot
) == FUNCTION_DECL
&& DECL_FRIEND_P (ot
)
2929 && !check_default_tmpl_args (nt
, DECL_TEMPLATE_PARMS (newdecl
),
2930 /*is_primary=*/true,
2931 /*is_partial=*/false,
2932 /*is_friend_decl=*/2))
2933 return G_("redeclaration of friend %q#D "
2934 "may not have default template arguments");
2938 else if (VAR_P (newdecl
)
2939 && CP_DECL_THREAD_LOCAL_P (newdecl
) != CP_DECL_THREAD_LOCAL_P (olddecl
)
2940 && (! DECL_LANG_SPECIFIC (olddecl
)
2941 || ! CP_DECL_THREADPRIVATE_P (olddecl
)
2942 || CP_DECL_THREAD_LOCAL_P (newdecl
)))
2944 /* Only variables can be thread-local, and all declarations must
2945 agree on this property. */
2946 if (CP_DECL_THREAD_LOCAL_P (newdecl
))
2947 return G_("thread-local declaration of %q#D follows "
2948 "non-thread-local declaration");
2950 return G_("non-thread-local declaration of %q#D follows "
2951 "thread-local declaration");
2953 else if (toplevel_bindings_p () || DECL_NAMESPACE_SCOPE_P (newdecl
))
2955 /* The objects have been declared at namespace scope. If either
2956 is a member of an anonymous union, then this is an invalid
2957 redeclaration. For example:
2963 if ((VAR_P (newdecl
) && DECL_ANON_UNION_VAR_P (newdecl
))
2964 || (VAR_P (olddecl
) && DECL_ANON_UNION_VAR_P (olddecl
)))
2965 return G_("redeclaration of %q#D");
2966 /* If at least one declaration is a reference, there is no
2967 conflict. For example:
2973 if (DECL_EXTERNAL (newdecl
) || DECL_EXTERNAL (olddecl
))
2976 /* Static data member declared outside a class definition
2977 if the variable is defined within the class with constexpr
2978 specifier is declaration rather than definition (and
2980 if (cxx_dialect
>= cxx17
2982 && DECL_CLASS_SCOPE_P (olddecl
)
2983 && DECL_DECLARED_CONSTEXPR_P (olddecl
)
2984 && !DECL_INITIAL (newdecl
))
2986 DECL_EXTERNAL (newdecl
) = 1;
2987 /* For now, only warn with explicit -Wdeprecated. */
2988 if (global_options_set
.x_warn_deprecated
2989 && warning_at (DECL_SOURCE_LOCATION (newdecl
), OPT_Wdeprecated
,
2990 "redundant redeclaration of %<constexpr%> static "
2991 "data member %qD", newdecl
))
2992 inform (DECL_SOURCE_LOCATION (olddecl
),
2993 "previous declaration of %qD", olddecl
);
2997 /* Reject two definitions. */
2998 return G_("redefinition of %q#D");
3002 /* Objects declared with block scope: */
3003 /* Reject two definitions, and reject a definition
3004 together with an external reference. */
3005 if (!(DECL_EXTERNAL (newdecl
) && DECL_EXTERNAL (olddecl
)))
3006 return G_("redeclaration of %q#D");
3012 /* Hash and equality functions for the named_label table. */
3015 named_label_hash::hash (const value_type entry
)
3017 return IDENTIFIER_HASH_VALUE (entry
->name
);
3021 named_label_hash::equal (const value_type entry
, compare_type name
)
3023 return name
== entry
->name
;
3026 /* Look for a label named ID in the current function. If one cannot
3027 be found, create one. Return the named_label_entry, or NULL on
3030 static named_label_entry
*
3031 lookup_label_1 (tree id
, bool making_local_p
)
3033 /* You can't use labels at global scope. */
3034 if (current_function_decl
== NULL_TREE
)
3036 error ("label %qE referenced outside of any function", id
);
3041 named_labels
= hash_table
<named_label_hash
>::create_ggc (13);
3043 hashval_t hash
= IDENTIFIER_HASH_VALUE (id
);
3044 named_label_entry
**slot
3045 = named_labels
->find_slot_with_hash (id
, hash
, INSERT
);
3046 named_label_entry
*old
= *slot
;
3048 if (old
&& old
->label_decl
)
3050 if (!making_local_p
)
3053 if (old
->binding_level
== current_binding_level
)
3055 error ("local label %qE conflicts with existing label", id
);
3056 inform (DECL_SOURCE_LOCATION (old
->label_decl
), "previous label");
3061 /* We are making a new decl, create or reuse the named_label_entry */
3062 named_label_entry
*ent
= NULL
;
3063 if (old
&& !old
->label_decl
)
3067 ent
= ggc_cleared_alloc
<named_label_entry
> ();
3073 /* Now create the LABEL_DECL. */
3074 tree decl
= build_decl (input_location
, LABEL_DECL
, id
, void_type_node
);
3076 DECL_CONTEXT (decl
) = current_function_decl
;
3077 SET_DECL_MODE (decl
, VOIDmode
);
3080 C_DECLARED_LABEL_FLAG (decl
) = true;
3081 DECL_CHAIN (decl
) = current_binding_level
->names
;
3082 current_binding_level
->names
= decl
;
3085 ent
->label_decl
= decl
;
3090 /* Wrapper for lookup_label_1. */
3093 lookup_label (tree id
)
3095 bool subtime
= timevar_cond_start (TV_NAME_LOOKUP
);
3096 named_label_entry
*ent
= lookup_label_1 (id
, false);
3097 timevar_cond_stop (TV_NAME_LOOKUP
, subtime
);
3098 return ent
? ent
->label_decl
: NULL_TREE
;
3102 declare_local_label (tree id
)
3104 bool subtime
= timevar_cond_start (TV_NAME_LOOKUP
);
3105 named_label_entry
*ent
= lookup_label_1 (id
, true);
3106 timevar_cond_stop (TV_NAME_LOOKUP
, subtime
);
3107 return ent
? ent
->label_decl
: NULL_TREE
;
3110 /* Returns nonzero if it is ill-formed to jump past the declaration of
3111 DECL. Returns 2 if it's also a real problem. */
3114 decl_jump_unsafe (tree decl
)
3116 /* [stmt.dcl]/3: A program that jumps from a point where a local variable
3117 with automatic storage duration is not in scope to a point where it is
3118 in scope is ill-formed unless the variable has scalar type, class type
3119 with a trivial default constructor and a trivial destructor, a
3120 cv-qualified version of one of these types, or an array of one of the
3121 preceding types and is declared without an initializer (8.5). */
3122 tree type
= TREE_TYPE (decl
);
3124 if (!VAR_P (decl
) || TREE_STATIC (decl
)
3125 || type
== error_mark_node
)
3128 if (DECL_NONTRIVIALLY_INITIALIZED_P (decl
)
3129 || variably_modified_type_p (type
, NULL_TREE
))
3132 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type
))
3138 /* A subroutine of check_previous_goto_1 and check_goto to identify a branch
3142 identify_goto (tree decl
, location_t loc
, const location_t
*locus
,
3143 diagnostic_t diag_kind
)
3146 = emit_diagnostic (diag_kind
, loc
, 0,
3147 decl
? N_("jump to label %qD")
3148 : N_("jump to case label"), decl
);
3149 if (complained
&& locus
)
3150 inform (*locus
, " from here");
3154 /* Check that a single previously seen jump to a newly defined label
3155 is OK. DECL is the LABEL_DECL or 0; LEVEL is the binding_level for
3156 the jump context; NAMES are the names in scope in LEVEL at the jump
3157 context; LOCUS is the source position of the jump or 0. Returns
3158 true if all is well. */
3161 check_previous_goto_1 (tree decl
, cp_binding_level
* level
, tree names
,
3162 bool exited_omp
, const location_t
*locus
)
3164 cp_binding_level
*b
;
3165 bool complained
= false;
3167 bool saw_eh
= false, saw_omp
= false, saw_tm
= false, saw_cxif
= false;
3171 complained
= identify_goto (decl
, input_location
, locus
, DK_ERROR
);
3173 inform (input_location
, " exits OpenMP structured block");
3178 for (b
= current_binding_level
; b
; b
= b
->level_chain
)
3180 tree new_decls
, old_decls
= (b
== level
? names
: NULL_TREE
);
3182 for (new_decls
= b
->names
; new_decls
!= old_decls
;
3183 new_decls
= (DECL_P (new_decls
) ? DECL_CHAIN (new_decls
)
3184 : TREE_CHAIN (new_decls
)))
3186 int problem
= decl_jump_unsafe (new_decls
);
3192 complained
= identify_goto (decl
, input_location
, locus
,
3199 inform (DECL_SOURCE_LOCATION (new_decls
),
3200 " crosses initialization of %q#D", new_decls
);
3202 inform (DECL_SOURCE_LOCATION (new_decls
),
3203 " enters scope of %q#D, which has "
3204 "non-trivial destructor", new_decls
);
3211 const char *inf
= NULL
;
3212 location_t loc
= input_location
;
3217 inf
= N_("enters try block");
3223 inf
= N_("enters catch block");
3229 inf
= N_("enters OpenMP structured block");
3233 case sk_transaction
:
3235 inf
= N_("enters synchronized or atomic statement");
3240 if (!saw_cxif
&& level_for_constexpr_if (b
->level_chain
))
3242 inf
= N_("enters constexpr if statement");
3243 loc
= EXPR_LOCATION (b
->level_chain
->this_entity
);
3255 complained
= identify_goto (decl
, input_location
, locus
, DK_ERROR
);
3258 inform (loc
, " %s", inf
);
3266 check_previous_goto (tree decl
, struct named_label_use_entry
*use
)
3268 check_previous_goto_1 (decl
, use
->binding_level
,
3269 use
->names_in_scope
, use
->in_omp_scope
,
3270 &use
->o_goto_locus
);
3274 check_switch_goto (cp_binding_level
* level
)
3276 return check_previous_goto_1 (NULL_TREE
, level
, level
->names
, false, NULL
);
3279 /* Check that a new jump to a label DECL is OK. Called by
3280 finish_goto_stmt. */
3283 check_goto (tree decl
)
3285 /* We can't know where a computed goto is jumping.
3286 So we assume that it's OK. */
3287 if (TREE_CODE (decl
) != LABEL_DECL
)
3290 /* We didn't record any information about this label when we created it,
3291 and there's not much point since it's trivial to analyze as a return. */
3292 if (decl
== cdtor_label
)
3295 hashval_t hash
= IDENTIFIER_HASH_VALUE (DECL_NAME (decl
));
3296 named_label_entry
**slot
3297 = named_labels
->find_slot_with_hash (DECL_NAME (decl
), hash
, NO_INSERT
);
3298 named_label_entry
*ent
= *slot
;
3300 /* If the label hasn't been defined yet, defer checking. */
3301 if (! DECL_INITIAL (decl
))
3303 /* Don't bother creating another use if the last goto had the
3304 same data, and will therefore create the same set of errors. */
3306 && ent
->uses
->names_in_scope
== current_binding_level
->names
)
3309 named_label_use_entry
*new_use
3310 = ggc_alloc
<named_label_use_entry
> ();
3311 new_use
->binding_level
= current_binding_level
;
3312 new_use
->names_in_scope
= current_binding_level
->names
;
3313 new_use
->o_goto_locus
= input_location
;
3314 new_use
->in_omp_scope
= false;
3316 new_use
->next
= ent
->uses
;
3317 ent
->uses
= new_use
;
3321 bool saw_catch
= false, complained
= false;
3326 if (ent
->in_try_scope
|| ent
->in_catch_scope
|| ent
->in_transaction_scope
3327 || ent
->in_constexpr_if
3328 || ent
->in_omp_scope
|| !vec_safe_is_empty (ent
->bad_decls
))
3330 diagnostic_t diag_kind
= DK_PERMERROR
;
3331 if (ent
->in_try_scope
|| ent
->in_catch_scope
|| ent
->in_constexpr_if
3332 || ent
->in_transaction_scope
|| ent
->in_omp_scope
)
3333 diag_kind
= DK_ERROR
;
3334 complained
= identify_goto (decl
, DECL_SOURCE_LOCATION (decl
),
3335 &input_location
, diag_kind
);
3336 identified
= 1 + (diag_kind
== DK_ERROR
);
3339 FOR_EACH_VEC_SAFE_ELT (ent
->bad_decls
, ix
, bad
)
3341 int u
= decl_jump_unsafe (bad
);
3343 if (u
> 1 && DECL_ARTIFICIAL (bad
))
3345 /* Can't skip init of __exception_info. */
3346 if (identified
== 1)
3348 complained
= identify_goto (decl
, DECL_SOURCE_LOCATION (decl
),
3349 &input_location
, DK_ERROR
);
3353 inform (DECL_SOURCE_LOCATION (bad
), " enters catch block");
3356 else if (complained
)
3359 inform (DECL_SOURCE_LOCATION (bad
),
3360 " skips initialization of %q#D", bad
);
3362 inform (DECL_SOURCE_LOCATION (bad
),
3363 " enters scope of %q#D which has "
3364 "non-trivial destructor", bad
);
3370 if (ent
->in_try_scope
)
3371 inform (input_location
, " enters try block");
3372 else if (ent
->in_catch_scope
&& !saw_catch
)
3373 inform (input_location
, " enters catch block");
3374 else if (ent
->in_transaction_scope
)
3375 inform (input_location
, " enters synchronized or atomic statement");
3376 else if (ent
->in_constexpr_if
)
3377 inform (input_location
, " enters %<constexpr%> if statement");
3380 if (ent
->in_omp_scope
)
3383 inform (input_location
, " enters OpenMP structured block");
3385 else if (flag_openmp
)
3386 for (cp_binding_level
*b
= current_binding_level
; b
; b
= b
->level_chain
)
3388 if (b
== ent
->binding_level
)
3390 if (b
->kind
== sk_omp
)
3394 complained
= identify_goto (decl
,
3395 DECL_SOURCE_LOCATION (decl
),
3396 &input_location
, DK_ERROR
);
3400 inform (input_location
, " exits OpenMP structured block");
3406 /* Check that a return is ok wrt OpenMP structured blocks.
3407 Called by finish_return_stmt. Returns true if all is well. */
3410 check_omp_return (void)
3412 for (cp_binding_level
*b
= current_binding_level
; b
; b
= b
->level_chain
)
3413 if (b
->kind
== sk_omp
)
3415 error ("invalid exit from OpenMP structured block");
3418 else if (b
->kind
== sk_function_parms
)
3423 /* Define a label, specifying the location in the source file.
3424 Return the LABEL_DECL node for the label. */
3427 define_label_1 (location_t location
, tree name
)
3429 /* After labels, make any new cleanups in the function go into their
3430 own new (temporary) binding contour. */
3431 for (cp_binding_level
*p
= current_binding_level
;
3432 p
->kind
!= sk_function_parms
;
3434 p
->more_cleanups_ok
= 0;
3436 named_label_entry
*ent
= lookup_label_1 (name
, false);
3437 tree decl
= ent
->label_decl
;
3439 if (DECL_INITIAL (decl
) != NULL_TREE
)
3441 error ("duplicate label %qD", decl
);
3442 return error_mark_node
;
3446 /* Mark label as having been defined. */
3447 DECL_INITIAL (decl
) = error_mark_node
;
3448 /* Say where in the source. */
3449 DECL_SOURCE_LOCATION (decl
) = location
;
3451 ent
->binding_level
= current_binding_level
;
3452 ent
->names_in_scope
= current_binding_level
->names
;
3454 for (named_label_use_entry
*use
= ent
->uses
; use
; use
= use
->next
)
3455 check_previous_goto (decl
, use
);
3462 /* Wrapper for define_label_1. */
3465 define_label (location_t location
, tree name
)
3467 bool running
= timevar_cond_start (TV_NAME_LOOKUP
);
3468 tree ret
= define_label_1 (location
, name
);
3469 timevar_cond_stop (TV_NAME_LOOKUP
, running
);
3476 cp_binding_level
*level
;
3477 struct cp_switch
*next
;
3478 /* The SWITCH_STMT being built. */
3480 /* A splay-tree mapping the low element of a case range to the high
3481 element, or NULL_TREE if there is no high element. Used to
3482 determine whether or not a new case label duplicates an old case
3483 label. We need a tree, rather than simply a hash table, because
3484 of the GNU case range extension. */
3486 /* Remember whether there was a case value that is outside the
3487 range of the original type of the controlling expression. */
3488 bool outside_range_p
;
3489 /* Remember whether a default: case label has been seen. */
3491 /* Remember whether a BREAK_STMT has been seen in this SWITCH_STMT. */
3492 bool break_stmt_seen_p
;
3493 /* Set if inside of {FOR,DO,WHILE}_BODY nested inside of a switch,
3494 where BREAK_STMT doesn't belong to the SWITCH_STMT. */
3495 bool in_loop_body_p
;
3498 /* A stack of the currently active switch statements. The innermost
3499 switch statement is on the top of the stack. There is no need to
3500 mark the stack for garbage collection because it is only active
3501 during the processing of the body of a function, and we never
3502 collect at that point. */
3504 static struct cp_switch
*switch_stack
;
3506 /* Called right after a switch-statement condition is parsed.
3507 SWITCH_STMT is the switch statement being parsed. */
3510 push_switch (tree switch_stmt
)
3512 struct cp_switch
*p
= XNEW (struct cp_switch
);
3513 p
->level
= current_binding_level
;
3514 p
->next
= switch_stack
;
3515 p
->switch_stmt
= switch_stmt
;
3516 p
->cases
= splay_tree_new (case_compare
, NULL
, NULL
);
3517 p
->outside_range_p
= false;
3518 p
->has_default_p
= false;
3519 p
->break_stmt_seen_p
= false;
3520 p
->in_loop_body_p
= false;
3527 struct cp_switch
*cs
= switch_stack
;
3528 location_t switch_location
;
3530 /* Emit warnings as needed. */
3531 switch_location
= cp_expr_loc_or_loc (cs
->switch_stmt
, input_location
);
3532 const bool bool_cond_p
3533 = (SWITCH_STMT_TYPE (cs
->switch_stmt
)
3534 && TREE_CODE (SWITCH_STMT_TYPE (cs
->switch_stmt
)) == BOOLEAN_TYPE
);
3535 if (!processing_template_decl
)
3536 c_do_switch_warnings (cs
->cases
, switch_location
,
3537 SWITCH_STMT_TYPE (cs
->switch_stmt
),
3538 SWITCH_STMT_COND (cs
->switch_stmt
),
3539 bool_cond_p
, cs
->outside_range_p
);
3541 /* For the benefit of block_may_fallthru remember if the switch body
3542 case labels cover all possible values and if there are break; stmts. */
3543 if (cs
->has_default_p
3544 || (!processing_template_decl
3545 && c_switch_covers_all_cases_p (cs
->cases
,
3546 SWITCH_STMT_TYPE (cs
->switch_stmt
))))
3547 SWITCH_STMT_ALL_CASES_P (cs
->switch_stmt
) = 1;
3548 if (!cs
->break_stmt_seen_p
)
3549 SWITCH_STMT_NO_BREAK_P (cs
->switch_stmt
) = 1;
3550 gcc_assert (!cs
->in_loop_body_p
);
3551 splay_tree_delete (cs
->cases
);
3552 switch_stack
= switch_stack
->next
;
3556 /* Note that a BREAK_STMT is about to be added. If it is inside of
3557 a SWITCH_STMT and not inside of a loop body inside of it, note
3558 in switch_stack we've seen a BREAK_STMT. */
3561 note_break_stmt (void)
3563 if (switch_stack
&& !switch_stack
->in_loop_body_p
)
3564 switch_stack
->break_stmt_seen_p
= true;
3567 /* Note the start of processing of an iteration statement's body.
3568 The note_break_stmt function will do nothing while processing it.
3569 Return a flag that should be passed to note_iteration_stmt_body_end. */
3572 note_iteration_stmt_body_start (void)
3576 bool ret
= switch_stack
->in_loop_body_p
;
3577 switch_stack
->in_loop_body_p
= true;
3581 /* Note the end of processing of an iteration statement's body. */
3584 note_iteration_stmt_body_end (bool prev
)
3587 switch_stack
->in_loop_body_p
= prev
;
3590 /* Convert a case constant VALUE in a switch to the type TYPE of the switch
3591 condition. Note that if TYPE and VALUE are already integral we don't
3592 really do the conversion because the language-independent
3593 warning/optimization code will work better that way. */
3596 case_conversion (tree type
, tree value
)
3598 if (value
== NULL_TREE
)
3601 value
= mark_rvalue_use (value
);
3603 if (cxx_dialect
>= cxx11
3604 && (SCOPED_ENUM_P (type
)
3605 || !INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (value
))))
3607 if (INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type
))
3608 type
= type_promotes_to (type
);
3609 value
= (perform_implicit_conversion_flags
3610 (type
, value
, tf_warning_or_error
,
3611 LOOKUP_IMPLICIT
| LOOKUP_NO_NON_INTEGRAL
));
3613 return cxx_constant_value (value
);
3616 /* Note that we've seen a definition of a case label, and complain if this
3617 is a bad place for one. */
3620 finish_case_label (location_t loc
, tree low_value
, tree high_value
)
3623 cp_binding_level
*p
;
3626 if (low_value
== NULL_TREE
&& high_value
== NULL_TREE
)
3627 switch_stack
->has_default_p
= true;
3629 if (processing_template_decl
)
3633 /* For templates, just add the case label; we'll do semantic
3634 analysis at instantiation-time. */
3635 label
= build_decl (loc
, LABEL_DECL
, NULL_TREE
, NULL_TREE
);
3636 return add_stmt (build_case_label (low_value
, high_value
, label
));
3639 /* Find the condition on which this switch statement depends. */
3640 cond
= SWITCH_STMT_COND (switch_stack
->switch_stmt
);
3641 if (cond
&& TREE_CODE (cond
) == TREE_LIST
)
3642 cond
= TREE_VALUE (cond
);
3644 if (!check_switch_goto (switch_stack
->level
))
3645 return error_mark_node
;
3647 type
= SWITCH_STMT_TYPE (switch_stack
->switch_stmt
);
3649 low_value
= case_conversion (type
, low_value
);
3650 high_value
= case_conversion (type
, high_value
);
3652 r
= c_add_case_label (loc
, switch_stack
->cases
, cond
, type
,
3653 low_value
, high_value
,
3654 &switch_stack
->outside_range_p
);
3656 /* After labels, make any new cleanups in the function go into their
3657 own new (temporary) binding contour. */
3658 for (p
= current_binding_level
;
3659 p
->kind
!= sk_function_parms
;
3661 p
->more_cleanups_ok
= 0;
3666 struct typename_info
{
3674 struct typename_hasher
: ggc_ptr_hash
<tree_node
>
3676 typedef typename_info
*compare_type
;
3678 /* Hash a TYPENAME_TYPE. */
3685 hash
= (htab_hash_pointer (TYPE_CONTEXT (t
))
3686 ^ htab_hash_pointer (TYPE_IDENTIFIER (t
)));
3691 /* Compare two TYPENAME_TYPEs. */
3694 equal (tree t1
, const typename_info
*t2
)
3696 return (TYPE_IDENTIFIER (t1
) == t2
->name
3697 && TYPE_CONTEXT (t1
) == t2
->scope
3698 && TYPENAME_TYPE_FULLNAME (t1
) == t2
->template_id
3699 && TYPENAME_IS_ENUM_P (t1
) == t2
->enum_p
3700 && TYPENAME_IS_CLASS_P (t1
) == t2
->class_p
);
3704 /* Build a TYPENAME_TYPE. If the type is `typename T::t', CONTEXT is
3705 the type of `T', NAME is the IDENTIFIER_NODE for `t'.
3707 Returns the new TYPENAME_TYPE. */
3709 static GTY (()) hash_table
<typename_hasher
> *typename_htab
;
3712 build_typename_type (tree context
, tree name
, tree fullname
,
3713 enum tag_types tag_type
)
3721 if (typename_htab
== NULL
)
3722 typename_htab
= hash_table
<typename_hasher
>::create_ggc (61);
3724 ti
.scope
= FROB_CONTEXT (context
);
3726 ti
.template_id
= fullname
;
3727 ti
.enum_p
= tag_type
== enum_type
;
3728 ti
.class_p
= (tag_type
== class_type
3729 || tag_type
== record_type
3730 || tag_type
== union_type
);
3731 hash
= (htab_hash_pointer (ti
.scope
)
3732 ^ htab_hash_pointer (ti
.name
));
3734 /* See if we already have this type. */
3735 e
= typename_htab
->find_slot_with_hash (&ti
, hash
, INSERT
);
3740 /* Build the TYPENAME_TYPE. */
3741 t
= cxx_make_type (TYPENAME_TYPE
);
3742 TYPE_CONTEXT (t
) = ti
.scope
;
3743 TYPENAME_TYPE_FULLNAME (t
) = ti
.template_id
;
3744 TYPENAME_IS_ENUM_P (t
) = ti
.enum_p
;
3745 TYPENAME_IS_CLASS_P (t
) = ti
.class_p
;
3747 /* Build the corresponding TYPE_DECL. */
3748 d
= build_decl (input_location
, TYPE_DECL
, name
, t
);
3749 TYPE_NAME (TREE_TYPE (d
)) = d
;
3750 TYPE_STUB_DECL (TREE_TYPE (d
)) = d
;
3751 DECL_CONTEXT (d
) = FROB_CONTEXT (context
);
3752 DECL_ARTIFICIAL (d
) = 1;
3754 /* Store it in the hash table. */
3757 /* TYPENAME_TYPEs must always be compared structurally, because
3758 they may or may not resolve down to another type depending on
3759 the currently open classes. */
3760 SET_TYPE_STRUCTURAL_EQUALITY (t
);
3766 /* Resolve `typename CONTEXT::NAME'. TAG_TYPE indicates the tag
3767 provided to name the type. Returns an appropriate type, unless an
3768 error occurs, in which case error_mark_node is returned. If we
3769 locate a non-artificial TYPE_DECL and TF_KEEP_TYPE_DECL is set, we
3770 return that, rather than the _TYPE it corresponds to, in other
3771 cases we look through the type decl. If TF_ERROR is set, complain
3772 about errors, otherwise be quiet. */
3775 make_typename_type (tree context
, tree name
, enum tag_types tag_type
,
3776 tsubst_flags_t complain
)
3782 if (name
== error_mark_node
3783 || context
== NULL_TREE
3784 || context
== error_mark_node
)
3785 return error_mark_node
;
3789 if (!(TYPE_LANG_SPECIFIC (name
)
3790 && (CLASSTYPE_IS_TEMPLATE (name
)
3791 || CLASSTYPE_USE_TEMPLATE (name
))))
3792 name
= TYPE_IDENTIFIER (name
);
3794 /* Create a TEMPLATE_ID_EXPR for the type. */
3795 name
= build_nt (TEMPLATE_ID_EXPR
,
3796 CLASSTYPE_TI_TEMPLATE (name
),
3797 CLASSTYPE_TI_ARGS (name
));
3799 else if (TREE_CODE (name
) == TYPE_DECL
)
3800 name
= DECL_NAME (name
);
3804 if (TREE_CODE (name
) == TEMPLATE_ID_EXPR
)
3806 name
= TREE_OPERAND (name
, 0);
3807 if (DECL_TYPE_TEMPLATE_P (name
))
3808 name
= TREE_OPERAND (fullname
, 0) = DECL_NAME (name
);
3809 if (TREE_CODE (name
) != IDENTIFIER_NODE
)
3811 if (complain
& tf_error
)
3812 error ("%qD is not a type", name
);
3813 return error_mark_node
;
3816 if (TREE_CODE (name
) == TEMPLATE_DECL
)
3818 if (complain
& tf_error
)
3819 error ("%qD used without template arguments", name
);
3820 return error_mark_node
;
3822 gcc_assert (identifier_p (name
));
3823 gcc_assert (TYPE_P (context
));
3825 if (!MAYBE_CLASS_TYPE_P (context
))
3827 if (complain
& tf_error
)
3828 error ("%q#T is not a class", context
);
3829 return error_mark_node
;
3832 /* When the CONTEXT is a dependent type, NAME could refer to a
3833 dependent base class of CONTEXT. But look inside it anyway
3834 if CONTEXT is a currently open scope, in case it refers to a
3835 member of the current instantiation or a non-dependent base;
3836 lookup will stop when we hit a dependent base. */
3837 if (!dependent_scope_p (context
))
3838 /* We should only set WANT_TYPE when we're a nested typename type.
3839 Then we can give better diagnostics if we find a non-type. */
3840 t
= lookup_field (context
, name
, 2, /*want_type=*/true);
3844 if ((!t
|| TREE_CODE (t
) == TREE_LIST
) && dependent_type_p (context
))
3845 return build_typename_type (context
, name
, fullname
, tag_type
);
3847 want_template
= TREE_CODE (fullname
) == TEMPLATE_ID_EXPR
;
3851 if (complain
& tf_error
)
3853 if (!COMPLETE_TYPE_P (context
))
3854 cxx_incomplete_type_error (NULL_TREE
, context
);
3856 error (want_template
? G_("no class template named %q#T in %q#T")
3857 : G_("no type named %q#T in %q#T"), name
, context
);
3859 return error_mark_node
;
3862 /* Pull out the template from an injected-class-name (or multiple). */
3864 t
= maybe_get_template_decl_from_type_decl (t
);
3866 if (TREE_CODE (t
) == TREE_LIST
)
3868 if (complain
& tf_error
)
3870 error ("lookup of %qT in %qT is ambiguous", name
, context
);
3871 print_candidates (t
);
3873 return error_mark_node
;
3876 if (want_template
&& !DECL_TYPE_TEMPLATE_P (t
))
3878 if (complain
& tf_error
)
3879 error ("%<typename %T::%D%> names %q#T, which is not a class template",
3881 return error_mark_node
;
3883 if (!want_template
&& TREE_CODE (t
) != TYPE_DECL
)
3885 if (complain
& tf_error
)
3886 error ("%<typename %T::%D%> names %q#T, which is not a type",
3888 return error_mark_node
;
3891 if (!perform_or_defer_access_check (TYPE_BINFO (context
), t
, t
, complain
))
3892 return error_mark_node
;
3894 /* If we are currently parsing a template and if T is a typedef accessed
3895 through CONTEXT then we need to remember and check access of T at
3896 template instantiation time. */
3897 add_typedef_to_current_template_for_access_check (t
, context
, input_location
);
3900 return lookup_template_class (t
, TREE_OPERAND (fullname
, 1),
3902 /*entering_scope=*/0,
3903 complain
| tf_user
);
3905 if (DECL_ARTIFICIAL (t
) || !(complain
& tf_keep_type_decl
))
3908 maybe_record_typedef_use (t
);
3913 /* Resolve `CONTEXT::template NAME'. Returns a TEMPLATE_DECL if the name
3914 can be resolved or an UNBOUND_CLASS_TEMPLATE, unless an error occurs,
3915 in which case error_mark_node is returned.
3917 If PARM_LIST is non-NULL, also make sure that the template parameter
3918 list of TEMPLATE_DECL matches.
3920 If COMPLAIN zero, don't complain about any errors that occur. */
3923 make_unbound_class_template (tree context
, tree name
, tree parm_list
,
3924 tsubst_flags_t complain
)
3930 name
= TYPE_IDENTIFIER (name
);
3931 else if (DECL_P (name
))
3932 name
= DECL_NAME (name
);
3933 gcc_assert (identifier_p (name
));
3935 if (!dependent_type_p (context
)
3936 || currently_open_class (context
))
3938 tree tmpl
= NULL_TREE
;
3940 if (MAYBE_CLASS_TYPE_P (context
))
3941 tmpl
= lookup_field (context
, name
, 0, false);
3943 if (tmpl
&& TREE_CODE (tmpl
) == TYPE_DECL
)
3944 tmpl
= maybe_get_template_decl_from_type_decl (tmpl
);
3946 if (!tmpl
|| !DECL_TYPE_TEMPLATE_P (tmpl
))
3948 if (complain
& tf_error
)
3949 error ("no class template named %q#T in %q#T", name
, context
);
3950 return error_mark_node
;
3954 && !comp_template_parms (DECL_TEMPLATE_PARMS (tmpl
), parm_list
))
3956 if (complain
& tf_error
)
3958 error ("template parameters do not match template %qD", tmpl
);
3959 inform (DECL_SOURCE_LOCATION (tmpl
),
3960 "%qD declared here", tmpl
);
3962 return error_mark_node
;
3965 if (!perform_or_defer_access_check (TYPE_BINFO (context
), tmpl
, tmpl
,
3967 return error_mark_node
;
3972 /* Build the UNBOUND_CLASS_TEMPLATE. */
3973 t
= cxx_make_type (UNBOUND_CLASS_TEMPLATE
);
3974 TYPE_CONTEXT (t
) = FROB_CONTEXT (context
);
3975 TREE_TYPE (t
) = NULL_TREE
;
3976 SET_TYPE_STRUCTURAL_EQUALITY (t
);
3978 /* Build the corresponding TEMPLATE_DECL. */
3979 d
= build_decl (input_location
, TEMPLATE_DECL
, name
, t
);
3980 TYPE_NAME (TREE_TYPE (d
)) = d
;
3981 TYPE_STUB_DECL (TREE_TYPE (d
)) = d
;
3982 DECL_CONTEXT (d
) = FROB_CONTEXT (context
);
3983 DECL_ARTIFICIAL (d
) = 1;
3984 DECL_TEMPLATE_PARMS (d
) = parm_list
;
3991 /* Push the declarations of builtin types into the global namespace.
3992 RID_INDEX is the index of the builtin type in the array
3993 RID_POINTERS. NAME is the name used when looking up the builtin
3994 type. TYPE is the _TYPE node for the builtin type.
3996 The calls to set_global_binding below should be
3997 eliminated. Built-in types should not be looked up name; their
3998 names are keywords that the parser can recognize. However, there
3999 is code in c-common.c that uses identifier_global_value to look up
4000 built-in types by name. */
4003 record_builtin_type (enum rid rid_index
,
4007 tree decl
= NULL_TREE
;
4011 tree tname
= get_identifier (name
);
4012 tree tdecl
= build_decl (BUILTINS_LOCATION
, TYPE_DECL
, tname
, type
);
4013 DECL_ARTIFICIAL (tdecl
) = 1;
4014 set_global_binding (tdecl
);
4018 if ((int) rid_index
< (int) RID_MAX
)
4019 if (tree rname
= ridpointers
[(int) rid_index
])
4020 if (!decl
|| DECL_NAME (decl
) != rname
)
4022 tree rdecl
= build_decl (BUILTINS_LOCATION
, TYPE_DECL
, rname
, type
);
4023 DECL_ARTIFICIAL (rdecl
) = 1;
4024 set_global_binding (rdecl
);
4031 if (!TYPE_NAME (type
))
4032 TYPE_NAME (type
) = decl
;
4033 debug_hooks
->type_decl (decl
, 0);
4037 /* Push a type into the namespace so that the back ends ignore it. */
4040 record_unknown_type (tree type
, const char* name
)
4042 tree decl
= pushdecl (build_decl (UNKNOWN_LOCATION
,
4043 TYPE_DECL
, get_identifier (name
), type
));
4044 /* Make sure the "unknown type" typedecl gets ignored for debug info. */
4045 DECL_IGNORED_P (decl
) = 1;
4046 TYPE_DECL_SUPPRESS_DEBUG (decl
) = 1;
4047 TYPE_SIZE (type
) = TYPE_SIZE (void_type_node
);
4048 SET_TYPE_ALIGN (type
, 1);
4049 TYPE_USER_ALIGN (type
) = 0;
4050 SET_TYPE_MODE (type
, TYPE_MODE (void_type_node
));
4053 /* Create all the predefined identifiers. */
4056 initialize_predefined_identifiers (void)
4058 struct predefined_identifier
4060 const char *name
; /* Name. */
4061 tree
*node
; /* Node to store it in. */
4062 cp_identifier_kind kind
; /* Kind of identifier. */
4065 /* A table of identifiers to create at startup. */
4066 static const predefined_identifier predefined_identifiers
[] = {
4067 {"C++", &lang_name_cplusplus
, cik_normal
},
4068 {"C", &lang_name_c
, cik_normal
},
4069 /* Some of these names have a trailing space so that it is
4070 impossible for them to conflict with names written by users. */
4071 {"__ct ", &ctor_identifier
, cik_ctor
},
4072 {"__ct_base ", &base_ctor_identifier
, cik_ctor
},
4073 {"__ct_comp ", &complete_ctor_identifier
, cik_ctor
},
4074 {"__dt ", &dtor_identifier
, cik_dtor
},
4075 {"__dt_base ", &base_dtor_identifier
, cik_dtor
},
4076 {"__dt_comp ", &complete_dtor_identifier
, cik_dtor
},
4077 {"__dt_del ", &deleting_dtor_identifier
, cik_dtor
},
4078 {"__conv_op ", &conv_op_identifier
, cik_conv_op
},
4079 {"__in_chrg", &in_charge_identifier
, cik_normal
},
4080 {"this", &this_identifier
, cik_normal
},
4081 {"__delta", &delta_identifier
, cik_normal
},
4082 {"__pfn", &pfn_identifier
, cik_normal
},
4083 {"_vptr", &vptr_identifier
, cik_normal
},
4084 {"__vtt_parm", &vtt_parm_identifier
, cik_normal
},
4085 {"::", &global_identifier
, cik_normal
},
4086 {"std", &std_identifier
, cik_normal
},
4087 /* The demangler expects anonymous namespaces to be called
4088 something starting with '_GLOBAL__N_'. It no longer needs
4089 to be unique to the TU. */
4090 {"_GLOBAL__N_1", &anon_identifier
, cik_normal
},
4091 {"auto", &auto_identifier
, cik_normal
},
4092 {"decltype(auto)", &decltype_auto_identifier
, cik_normal
},
4093 {"initializer_list", &init_list_identifier
, cik_normal
},
4094 {"__for_range ", &for_range__identifier
, cik_normal
},
4095 {"__for_begin ", &for_begin__identifier
, cik_normal
},
4096 {"__for_end ", &for_end__identifier
, cik_normal
},
4097 {"__for_range", &for_range_identifier
, cik_normal
},
4098 {"__for_begin", &for_begin_identifier
, cik_normal
},
4099 {"__for_end", &for_end_identifier
, cik_normal
},
4100 {"abi_tag", &abi_tag_identifier
, cik_normal
},
4101 {"aligned", &aligned_identifier
, cik_normal
},
4102 {"begin", &begin_identifier
, cik_normal
},
4103 {"end", &end_identifier
, cik_normal
},
4104 {"get", &get__identifier
, cik_normal
},
4105 {"gnu", &gnu_identifier
, cik_normal
},
4106 {"tuple_element", &tuple_element_identifier
, cik_normal
},
4107 {"tuple_size", &tuple_size_identifier
, cik_normal
},
4108 {"type", &type_identifier
, cik_normal
},
4109 {"value", &value_identifier
, cik_normal
},
4110 {"_FUN", &fun_identifier
, cik_normal
},
4111 {"__closure", &closure_identifier
, cik_normal
},
4112 {NULL
, NULL
, cik_normal
}
4115 for (const predefined_identifier
*pid
= predefined_identifiers
;
4118 *pid
->node
= get_identifier (pid
->name
);
4119 /* Some of these identifiers already have a special kind. */
4120 if (pid
->kind
!= cik_normal
)
4121 set_identifier_kind (*pid
->node
, pid
->kind
);
4125 /* Create the predefined scalar types of C,
4126 and some nodes representing standard constants (0, 1, (void *)0).
4127 Initialize the global binding level.
4128 Make definitions for built-in primitive functions. */
4131 cxx_init_decl_processing (void)
4134 tree void_ftype_ptr
;
4136 /* Create all the identifiers we need. */
4137 initialize_predefined_identifiers ();
4139 /* Create the global variables. */
4140 push_to_top_level ();
4142 current_function_decl
= NULL_TREE
;
4143 current_binding_level
= NULL
;
4144 /* Enter the global namespace. */
4145 gcc_assert (global_namespace
== NULL_TREE
);
4146 global_namespace
= build_lang_decl (NAMESPACE_DECL
, global_identifier
,
4148 TREE_PUBLIC (global_namespace
) = 1;
4149 DECL_CONTEXT (global_namespace
)
4150 = build_translation_unit_decl (get_identifier (main_input_filename
));
4151 /* Remember whether we want the empty class passing ABI change warning
4153 TRANSLATION_UNIT_WARN_EMPTY_P (DECL_CONTEXT (global_namespace
))
4154 = warn_abi
&& abi_version_crosses (12);
4155 debug_hooks
->register_main_translation_unit
4156 (DECL_CONTEXT (global_namespace
));
4157 begin_scope (sk_namespace
, global_namespace
);
4158 current_namespace
= global_namespace
;
4160 if (flag_visibility_ms_compat
)
4161 default_visibility
= VISIBILITY_HIDDEN
;
4164 current_lang_name
= lang_name_c
;
4166 /* Create the `std' namespace. */
4167 push_namespace (std_identifier
);
4168 std_node
= current_namespace
;
4171 flag_noexcept_type
= (cxx_dialect
>= cxx17
);
4173 c_common_nodes_and_builtins ();
4175 integer_two_node
= build_int_cst (NULL_TREE
, 2);
4177 /* Guess at the initial static decls size. */
4178 vec_alloc (static_decls
, 500);
4180 /* ... and keyed classes. */
4181 vec_alloc (keyed_classes
, 100);
4183 record_builtin_type (RID_BOOL
, "bool", boolean_type_node
);
4184 truthvalue_type_node
= boolean_type_node
;
4185 truthvalue_false_node
= boolean_false_node
;
4186 truthvalue_true_node
= boolean_true_node
;
4188 empty_except_spec
= build_tree_list (NULL_TREE
, NULL_TREE
);
4189 noexcept_true_spec
= build_tree_list (boolean_true_node
, NULL_TREE
);
4190 noexcept_false_spec
= build_tree_list (boolean_false_node
, NULL_TREE
);
4191 noexcept_deferred_spec
= build_tree_list (make_node (DEFERRED_NOEXCEPT
),
4195 record_builtin_type (RID_MAX
, NULL
, string_type_node
);
4198 delta_type_node
= ptrdiff_type_node
;
4199 vtable_index_type
= ptrdiff_type_node
;
4201 vtt_parm_type
= build_pointer_type (const_ptr_type_node
);
4202 void_ftype
= build_function_type_list (void_type_node
, NULL_TREE
);
4203 void_ftype_ptr
= build_function_type_list (void_type_node
,
4204 ptr_type_node
, NULL_TREE
);
4206 = build_exception_variant (void_ftype_ptr
, empty_except_spec
);
4208 /* Create the conversion operator marker. This operator's DECL_NAME
4209 is in the identifier table, so we can use identifier equality to
4211 conv_op_marker
= build_lang_decl (FUNCTION_DECL
, conv_op_identifier
,
4214 /* C++ extensions */
4216 unknown_type_node
= make_node (LANG_TYPE
);
4217 record_unknown_type (unknown_type_node
, "unknown type");
4219 /* Indirecting an UNKNOWN_TYPE node yields an UNKNOWN_TYPE node. */
4220 TREE_TYPE (unknown_type_node
) = unknown_type_node
;
4222 /* Looking up TYPE_POINTER_TO and TYPE_REFERENCE_TO yield the same
4224 TYPE_POINTER_TO (unknown_type_node
) = unknown_type_node
;
4225 TYPE_REFERENCE_TO (unknown_type_node
) = unknown_type_node
;
4227 init_list_type_node
= make_node (LANG_TYPE
);
4228 record_unknown_type (init_list_type_node
, "init list");
4231 /* Make sure we get a unique function type, so we can give
4232 its pointer type a name. (This wins for gdb.) */
4233 tree vfunc_type
= make_node (FUNCTION_TYPE
);
4234 TREE_TYPE (vfunc_type
) = integer_type_node
;
4235 TYPE_ARG_TYPES (vfunc_type
) = NULL_TREE
;
4236 layout_type (vfunc_type
);
4238 vtable_entry_type
= build_pointer_type (vfunc_type
);
4240 record_builtin_type (RID_MAX
, "__vtbl_ptr_type", vtable_entry_type
);
4243 = build_cplus_array_type (vtable_entry_type
, NULL_TREE
);
4244 layout_type (vtbl_type_node
);
4245 vtbl_type_node
= cp_build_qualified_type (vtbl_type_node
, TYPE_QUAL_CONST
);
4246 record_builtin_type (RID_MAX
, NULL
, vtbl_type_node
);
4247 vtbl_ptr_type_node
= build_pointer_type (vtable_entry_type
);
4248 layout_type (vtbl_ptr_type_node
);
4249 record_builtin_type (RID_MAX
, NULL
, vtbl_ptr_type_node
);
4251 push_namespace (get_identifier ("__cxxabiv1"));
4252 abi_node
= current_namespace
;
4255 global_type_node
= make_node (LANG_TYPE
);
4256 record_unknown_type (global_type_node
, "global type");
4258 any_targ_node
= make_node (LANG_TYPE
);
4259 record_unknown_type (any_targ_node
, "any type");
4262 current_lang_name
= lang_name_cplusplus
;
4264 if (aligned_new_threshold
> 1
4265 && !pow2p_hwi (aligned_new_threshold
))
4267 error ("-faligned-new=%d is not a power of two", aligned_new_threshold
);
4268 aligned_new_threshold
= 1;
4270 if (aligned_new_threshold
== -1)
4271 aligned_new_threshold
= (cxx_dialect
>= cxx17
) ? 1 : 0;
4272 if (aligned_new_threshold
== 1)
4273 aligned_new_threshold
= malloc_alignment () / BITS_PER_UNIT
;
4276 tree newattrs
, extvisattr
;
4277 tree newtype
, deltype
;
4278 tree ptr_ftype_sizetype
;
4282 = build_function_type_list (ptr_type_node
, size_type_node
, NULL_TREE
);
4283 if (cxx_dialect
== cxx98
)
4286 tree bad_alloc_type_node
;
4287 tree bad_alloc_decl
;
4289 push_namespace (std_identifier
);
4290 bad_alloc_id
= get_identifier ("bad_alloc");
4291 bad_alloc_type_node
= make_class_type (RECORD_TYPE
);
4292 TYPE_CONTEXT (bad_alloc_type_node
) = current_namespace
;
4294 = create_implicit_typedef (bad_alloc_id
, bad_alloc_type_node
);
4295 DECL_CONTEXT (bad_alloc_decl
) = current_namespace
;
4299 = add_exception_specifier (NULL_TREE
, bad_alloc_type_node
, -1);
4302 new_eh_spec
= noexcept_false_spec
;
4304 /* Ensure attribs.c is initialized. */
4307 /* Ensure constraint.cc is initialized. */
4308 init_constraint_processing ();
4310 extvisattr
= build_tree_list (get_identifier ("externally_visible"),
4312 newattrs
= tree_cons (get_identifier ("alloc_size"),
4313 build_tree_list (NULL_TREE
, integer_one_node
),
4315 newtype
= cp_build_type_attribute_variant (ptr_ftype_sizetype
, newattrs
);
4316 newtype
= build_exception_variant (newtype
, new_eh_spec
);
4317 deltype
= cp_build_type_attribute_variant (void_ftype_ptr
, extvisattr
);
4318 deltype
= build_exception_variant (deltype
, empty_except_spec
);
4319 tree opnew
= push_cp_library_fn (NEW_EXPR
, newtype
, 0);
4320 DECL_IS_MALLOC (opnew
) = 1;
4321 DECL_IS_OPERATOR_NEW (opnew
) = 1;
4322 opnew
= push_cp_library_fn (VEC_NEW_EXPR
, newtype
, 0);
4323 DECL_IS_MALLOC (opnew
) = 1;
4324 DECL_IS_OPERATOR_NEW (opnew
) = 1;
4325 push_cp_library_fn (DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4326 push_cp_library_fn (VEC_DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4327 if (flag_sized_deallocation
)
4329 /* Also push the sized deallocation variants:
4330 void operator delete(void*, std::size_t) throw();
4331 void operator delete[](void*, std::size_t) throw(); */
4332 tree void_ftype_ptr_size
4333 = build_function_type_list (void_type_node
, ptr_type_node
,
4334 size_type_node
, NULL_TREE
);
4335 deltype
= cp_build_type_attribute_variant (void_ftype_ptr_size
,
4337 deltype
= build_exception_variant (deltype
, empty_except_spec
);
4338 push_cp_library_fn (DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4339 push_cp_library_fn (VEC_DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4342 if (aligned_new_threshold
)
4344 push_namespace (std_identifier
);
4345 tree align_id
= get_identifier ("align_val_t");
4346 align_type_node
= start_enum (align_id
, NULL_TREE
, size_type_node
,
4347 NULL_TREE
, /*scoped*/true, NULL
);
4350 /* operator new (size_t, align_val_t); */
4351 newtype
= build_function_type_list (ptr_type_node
, size_type_node
,
4352 align_type_node
, NULL_TREE
);
4353 newtype
= cp_build_type_attribute_variant (newtype
, newattrs
);
4354 newtype
= build_exception_variant (newtype
, new_eh_spec
);
4355 opnew
= push_cp_library_fn (NEW_EXPR
, newtype
, 0);
4356 DECL_IS_MALLOC (opnew
) = 1;
4357 DECL_IS_OPERATOR_NEW (opnew
) = 1;
4358 opnew
= push_cp_library_fn (VEC_NEW_EXPR
, newtype
, 0);
4359 DECL_IS_MALLOC (opnew
) = 1;
4360 DECL_IS_OPERATOR_NEW (opnew
) = 1;
4362 /* operator delete (void *, align_val_t); */
4363 deltype
= build_function_type_list (void_type_node
, ptr_type_node
,
4364 align_type_node
, NULL_TREE
);
4365 deltype
= cp_build_type_attribute_variant (deltype
, extvisattr
);
4366 deltype
= build_exception_variant (deltype
, empty_except_spec
);
4367 push_cp_library_fn (DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4368 push_cp_library_fn (VEC_DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4370 if (flag_sized_deallocation
)
4372 /* operator delete (void *, size_t, align_val_t); */
4373 deltype
= build_function_type_list (void_type_node
, ptr_type_node
,
4374 size_type_node
, align_type_node
,
4376 deltype
= cp_build_type_attribute_variant (deltype
, extvisattr
);
4377 deltype
= build_exception_variant (deltype
, empty_except_spec
);
4378 push_cp_library_fn (DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4379 push_cp_library_fn (VEC_DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4383 nullptr_type_node
= make_node (NULLPTR_TYPE
);
4384 TYPE_SIZE (nullptr_type_node
) = bitsize_int (GET_MODE_BITSIZE (ptr_mode
));
4385 TYPE_SIZE_UNIT (nullptr_type_node
) = size_int (GET_MODE_SIZE (ptr_mode
));
4386 TYPE_UNSIGNED (nullptr_type_node
) = 1;
4387 TYPE_PRECISION (nullptr_type_node
) = GET_MODE_BITSIZE (ptr_mode
);
4388 if (abi_version_at_least (9))
4389 SET_TYPE_ALIGN (nullptr_type_node
, GET_MODE_ALIGNMENT (ptr_mode
));
4390 SET_TYPE_MODE (nullptr_type_node
, ptr_mode
);
4391 record_builtin_type (RID_MAX
, "decltype(nullptr)", nullptr_type_node
);
4392 nullptr_node
= build_int_cst (nullptr_type_node
, 0);
4396 = build_library_fn_ptr ("__cxa_pure_virtual", void_ftype
,
4397 ECF_NORETURN
| ECF_NOTHROW
| ECF_COLD
);
4399 /* Perform other language dependent initializations. */
4400 init_class_processing ();
4401 init_rtti_processing ();
4402 init_template_processing ();
4404 if (flag_exceptions
)
4405 init_exception_processing ();
4407 if (! supports_one_only ())
4410 make_fname_decl
= cp_make_fname_decl
;
4411 start_fname_decls ();
4413 /* Show we use EH for cleanups. */
4414 if (flag_exceptions
)
4415 using_eh_for_cleanups ();
4418 /* Generate an initializer for a function naming variable from
4419 NAME. NAME may be NULL, to indicate a dependent name. TYPE_P is
4420 filled in with the type of the init. */
4423 cp_fname_init (const char* name
, tree
*type_p
)
4425 tree domain
= NULL_TREE
;
4427 tree init
= NULL_TREE
;
4432 length
= strlen (name
);
4433 domain
= build_index_type (size_int (length
));
4434 init
= build_string (length
+ 1, name
);
4437 type
= cp_build_qualified_type (char_type_node
, TYPE_QUAL_CONST
);
4438 type
= build_cplus_array_type (type
, domain
);
4443 TREE_TYPE (init
) = type
;
4445 init
= error_mark_node
;
4450 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give
4451 the decl, LOC is the location to give the decl, NAME is the
4452 initialization string and TYPE_DEP indicates whether NAME depended
4453 on the type of the function. We make use of that to detect
4454 __PRETTY_FUNCTION__ inside a template fn. This is being done lazily
4455 at the point of first use, so we mustn't push the decl now. */
4458 cp_make_fname_decl (location_t loc
, tree id
, int type_dep
)
4460 const char *const name
= (type_dep
&& processing_template_decl
4461 ? NULL
: fname_as_string (type_dep
));
4463 tree init
= cp_fname_init (name
, &type
);
4464 tree decl
= build_decl (loc
, VAR_DECL
, id
, type
);
4467 free (CONST_CAST (char *, name
));
4469 TREE_STATIC (decl
) = 1;
4470 TREE_READONLY (decl
) = 1;
4471 DECL_ARTIFICIAL (decl
) = 1;
4473 TREE_USED (decl
) = 1;
4475 if (current_function_decl
)
4477 DECL_CONTEXT (decl
) = current_function_decl
;
4478 decl
= pushdecl_outermost_localscope (decl
);
4479 cp_finish_decl (decl
, init
, /*init_const_expr_p=*/false, NULL_TREE
,
4480 LOOKUP_ONLYCONVERTING
);
4484 DECL_THIS_STATIC (decl
) = true;
4485 pushdecl_top_level_and_finish (decl
, init
);
4492 builtin_function_1 (tree decl
, tree context
, bool is_global
)
4494 tree id
= DECL_NAME (decl
);
4495 const char *name
= IDENTIFIER_POINTER (id
);
4497 retrofit_lang_decl (decl
);
4499 DECL_ARTIFICIAL (decl
) = 1;
4500 SET_DECL_LANGUAGE (decl
, lang_c
);
4501 /* Runtime library routines are, by definition, available in an
4502 external shared object. */
4503 DECL_VISIBILITY (decl
) = VISIBILITY_DEFAULT
;
4504 DECL_VISIBILITY_SPECIFIED (decl
) = 1;
4506 DECL_CONTEXT (decl
) = context
;
4508 /* A function in the user's namespace should have an explicit
4509 declaration before it is used. Mark the built-in function as
4510 anticipated but not actually declared. */
4511 if (name
[0] != '_' || name
[1] != '_')
4512 DECL_ANTICIPATED (decl
) = 1;
4513 else if (strncmp (name
+ 2, "builtin_", strlen ("builtin_")) != 0)
4515 size_t len
= strlen (name
);
4517 /* Treat __*_chk fortification functions as anticipated as well,
4518 unless they are __builtin_*. */
4519 if (len
> strlen ("___chk")
4520 && memcmp (name
+ len
- strlen ("_chk"),
4521 "_chk", strlen ("_chk") + 1) == 0)
4522 DECL_ANTICIPATED (decl
) = 1;
4526 pushdecl_top_level (decl
);
4534 cxx_builtin_function (tree decl
)
4536 tree id
= DECL_NAME (decl
);
4537 const char *name
= IDENTIFIER_POINTER (id
);
4538 /* All builtins that don't begin with an '_' should additionally
4539 go in the 'std' namespace. */
4542 tree decl2
= copy_node(decl
);
4543 push_namespace (std_identifier
);
4544 builtin_function_1 (decl2
, std_node
, false);
4548 return builtin_function_1 (decl
, NULL_TREE
, false);
4551 /* Like cxx_builtin_function, but guarantee the function is added to the global
4552 scope. This is to allow function specific options to add new machine
4553 dependent builtins when the target ISA changes via attribute((target(...)))
4554 which saves space on program startup if the program does not use non-generic
4558 cxx_builtin_function_ext_scope (tree decl
)
4561 tree id
= DECL_NAME (decl
);
4562 const char *name
= IDENTIFIER_POINTER (id
);
4563 /* All builtins that don't begin with an '_' should additionally
4564 go in the 'std' namespace. */
4567 tree decl2
= copy_node(decl
);
4568 push_namespace (std_identifier
);
4569 builtin_function_1 (decl2
, std_node
, true);
4573 return builtin_function_1 (decl
, NULL_TREE
, true);
4576 /* Generate a FUNCTION_DECL with the typical flags for a runtime library
4577 function. Not called directly. */
4580 build_library_fn (tree name
, enum tree_code operator_code
, tree type
,
4583 tree fn
= build_lang_decl (FUNCTION_DECL
, name
, type
);
4584 DECL_EXTERNAL (fn
) = 1;
4585 TREE_PUBLIC (fn
) = 1;
4586 DECL_ARTIFICIAL (fn
) = 1;
4587 DECL_OVERLOADED_OPERATOR_CODE_RAW (fn
)
4588 = OVL_OP_INFO (false, operator_code
)->ovl_op_code
;
4589 SET_DECL_LANGUAGE (fn
, lang_c
);
4590 /* Runtime library routines are, by definition, available in an
4591 external shared object. */
4592 DECL_VISIBILITY (fn
) = VISIBILITY_DEFAULT
;
4593 DECL_VISIBILITY_SPECIFIED (fn
) = 1;
4594 set_call_expr_flags (fn
, ecf_flags
);
4598 /* Returns the _DECL for a library function with C++ linkage. */
4601 build_cp_library_fn (tree name
, enum tree_code operator_code
, tree type
,
4604 tree fn
= build_library_fn (name
, operator_code
, type
, ecf_flags
);
4605 DECL_CONTEXT (fn
) = FROB_CONTEXT (current_namespace
);
4606 SET_DECL_LANGUAGE (fn
, lang_cplusplus
);
4610 /* Like build_library_fn, but takes a C string instead of an
4614 build_library_fn_ptr (const char* name
, tree type
, int ecf_flags
)
4616 return build_library_fn (get_identifier (name
), ERROR_MARK
, type
, ecf_flags
);
4619 /* Like build_cp_library_fn, but takes a C string instead of an
4623 build_cp_library_fn_ptr (const char* name
, tree type
, int ecf_flags
)
4625 return build_cp_library_fn (get_identifier (name
), ERROR_MARK
, type
,
4629 /* Like build_library_fn, but also pushes the function so that we will
4630 be able to find it via get_global_binding. Also, the function
4631 may throw exceptions listed in RAISES. */
4634 push_library_fn (tree name
, tree type
, tree raises
, int ecf_flags
)
4639 type
= build_exception_variant (type
, raises
);
4641 fn
= build_library_fn (name
, ERROR_MARK
, type
, ecf_flags
);
4642 pushdecl_top_level (fn
);
4646 /* Like build_cp_library_fn, but also pushes the function so that it
4647 will be found by normal lookup. */
4650 push_cp_library_fn (enum tree_code operator_code
, tree type
,
4653 tree fn
= build_cp_library_fn (ovl_op_identifier (false, operator_code
),
4654 operator_code
, type
, ecf_flags
);
4657 apply_tm_attr (fn
, get_identifier ("transaction_safe"));
4661 /* Like push_library_fn, but takes a TREE_LIST of parm types rather than
4665 push_void_library_fn (tree name
, tree parmtypes
, int ecf_flags
)
4667 tree type
= build_function_type (void_type_node
, parmtypes
);
4668 return push_library_fn (name
, type
, NULL_TREE
, ecf_flags
);
4671 /* Like push_library_fn, but also note that this function throws
4672 and does not return. Used for __throw_foo and the like. */
4675 push_throw_library_fn (tree name
, tree type
)
4677 tree fn
= push_library_fn (name
, type
, NULL_TREE
, ECF_NORETURN
| ECF_COLD
);
4681 /* When we call finish_struct for an anonymous union, we create
4682 default copy constructors and such. But, an anonymous union
4683 shouldn't have such things; this function undoes the damage to the
4684 anonymous union type T.
4686 (The reason that we create the synthesized methods is that we don't
4687 distinguish `union { int i; }' from `typedef union { int i; } U'.
4688 The first is an anonymous union; the second is just an ordinary
4692 fixup_anonymous_aggr (tree t
)
4694 /* Wipe out memory of synthesized methods. */
4695 TYPE_HAS_USER_CONSTRUCTOR (t
) = 0;
4696 TYPE_HAS_DEFAULT_CONSTRUCTOR (t
) = 0;
4697 TYPE_HAS_COPY_CTOR (t
) = 0;
4698 TYPE_HAS_CONST_COPY_CTOR (t
) = 0;
4699 TYPE_HAS_COPY_ASSIGN (t
) = 0;
4700 TYPE_HAS_CONST_COPY_ASSIGN (t
) = 0;
4702 /* Splice the implicitly generated functions out of TYPE_FIELDS. */
4703 for (tree probe
, *prev_p
= &TYPE_FIELDS (t
); (probe
= *prev_p
);)
4704 if (TREE_CODE (probe
) == FUNCTION_DECL
&& DECL_ARTIFICIAL (probe
))
4705 *prev_p
= DECL_CHAIN (probe
);
4707 prev_p
= &DECL_CHAIN (probe
);
4709 /* Anonymous aggregates cannot have fields with ctors, dtors or complex
4710 assignment operators (because they cannot have these methods themselves).
4711 For anonymous unions this is already checked because they are not allowed
4712 in any union, otherwise we have to check it. */
4713 if (TREE_CODE (t
) != UNION_TYPE
)
4717 for (field
= TYPE_FIELDS (t
); field
; field
= DECL_CHAIN (field
))
4718 if (TREE_CODE (field
) == FIELD_DECL
)
4720 type
= TREE_TYPE (field
);
4721 if (CLASS_TYPE_P (type
))
4723 if (TYPE_NEEDS_CONSTRUCTING (type
))
4724 error ("member %q+#D with constructor not allowed "
4725 "in anonymous aggregate", field
);
4726 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type
))
4727 error ("member %q+#D with destructor not allowed "
4728 "in anonymous aggregate", field
);
4729 if (TYPE_HAS_COMPLEX_COPY_ASSIGN (type
))
4730 error ("member %q+#D with copy assignment operator "
4731 "not allowed in anonymous aggregate", field
);
4737 /* Warn for an attribute located at LOCATION that appertains to the
4738 class type CLASS_TYPE that has not been properly placed after its
4739 class-key, in it class-specifier. */
4742 warn_misplaced_attr_for_class_type (source_location location
,
4745 gcc_assert (OVERLOAD_TYPE_P (class_type
));
4747 if (warning_at (location
, OPT_Wattributes
,
4748 "attribute ignored in declaration "
4749 "of %q#T", class_type
))
4751 "attribute for %q#T must follow the %qs keyword",
4752 class_type
, class_key_or_enum_as_string (class_type
));
4755 /* Make sure that a declaration with no declarator is well-formed, i.e.
4756 just declares a tagged type or anonymous union.
4758 Returns the type declared; or NULL_TREE if none. */
4761 check_tag_decl (cp_decl_specifier_seq
*declspecs
,
4762 bool explicit_type_instantiation_p
)
4764 int saw_friend
= decl_spec_seq_has_spec_p (declspecs
, ds_friend
);
4765 int saw_typedef
= decl_spec_seq_has_spec_p (declspecs
, ds_typedef
);
4766 /* If a class, struct, or enum type is declared by the DECLSPECS
4767 (i.e, if a class-specifier, enum-specifier, or non-typename
4768 elaborated-type-specifier appears in the DECLSPECS),
4769 DECLARED_TYPE is set to the corresponding type. */
4770 tree declared_type
= NULL_TREE
;
4771 bool error_p
= false;
4773 if (declspecs
->multiple_types_p
)
4774 error ("multiple types in one declaration");
4775 else if (declspecs
->redefined_builtin_type
)
4777 if (!in_system_header_at (input_location
))
4778 permerror (declspecs
->locations
[ds_redefined_builtin_type_spec
],
4779 "redeclaration of C++ built-in type %qT",
4780 declspecs
->redefined_builtin_type
);
4785 && TYPE_P (declspecs
->type
)
4786 && ((TREE_CODE (declspecs
->type
) != TYPENAME_TYPE
4787 && MAYBE_CLASS_TYPE_P (declspecs
->type
))
4788 || TREE_CODE (declspecs
->type
) == ENUMERAL_TYPE
))
4789 declared_type
= declspecs
->type
;
4790 else if (declspecs
->type
== error_mark_node
)
4792 if (declared_type
== NULL_TREE
&& ! saw_friend
&& !error_p
)
4793 permerror (input_location
, "declaration does not declare anything");
4794 else if (declared_type
!= NULL_TREE
&& type_uses_auto (declared_type
))
4796 error_at (declspecs
->locations
[ds_type_spec
],
4797 "%<auto%> can only be specified for variables "
4798 "or function declarations");
4799 return error_mark_node
;
4801 /* Check for an anonymous union. */
4802 else if (declared_type
&& RECORD_OR_UNION_CODE_P (TREE_CODE (declared_type
))
4803 && TYPE_UNNAMED_P (declared_type
))
4805 /* 7/3 In a simple-declaration, the optional init-declarator-list
4806 can be omitted only when declaring a class (clause 9) or
4807 enumeration (7.2), that is, when the decl-specifier-seq contains
4808 either a class-specifier, an elaborated-type-specifier with
4809 a class-key (9.1), or an enum-specifier. In these cases and
4810 whenever a class-specifier or enum-specifier is present in the
4811 decl-specifier-seq, the identifiers in these specifiers are among
4812 the names being declared by the declaration (as class-name,
4813 enum-names, or enumerators, depending on the syntax). In such
4814 cases, and except for the declaration of an unnamed bit-field (9.6),
4815 the decl-specifier-seq shall introduce one or more names into the
4816 program, or shall redeclare a name introduced by a previous
4817 declaration. [Example:
4818 enum { }; // ill-formed
4819 typedef class { }; // ill-formed
4823 error ("missing type-name in typedef-declaration");
4826 /* Anonymous unions are objects, so they can have specifiers. */;
4827 SET_ANON_AGGR_TYPE_P (declared_type
);
4829 if (TREE_CODE (declared_type
) != UNION_TYPE
4830 && !in_system_header_at (input_location
))
4831 pedwarn (input_location
, OPT_Wpedantic
, "ISO C++ prohibits anonymous structs");
4836 if (decl_spec_seq_has_spec_p (declspecs
, ds_inline
))
4837 error_at (declspecs
->locations
[ds_inline
],
4838 "%<inline%> can only be specified for functions");
4839 else if (decl_spec_seq_has_spec_p (declspecs
, ds_virtual
))
4840 error_at (declspecs
->locations
[ds_virtual
],
4841 "%<virtual%> can only be specified for functions");
4843 && (!current_class_type
4844 || current_scope () != current_class_type
))
4845 error_at (declspecs
->locations
[ds_friend
],
4846 "%<friend%> can only be specified inside a class");
4847 else if (decl_spec_seq_has_spec_p (declspecs
, ds_explicit
))
4848 error_at (declspecs
->locations
[ds_explicit
],
4849 "%<explicit%> can only be specified for constructors");
4850 else if (declspecs
->storage_class
)
4851 error_at (declspecs
->locations
[ds_storage_class
],
4852 "a storage class can only be specified for objects "
4854 else if (decl_spec_seq_has_spec_p (declspecs
, ds_const
))
4855 error_at (declspecs
->locations
[ds_const
],
4856 "%<const%> can only be specified for objects and "
4858 else if (decl_spec_seq_has_spec_p (declspecs
, ds_volatile
))
4859 error_at (declspecs
->locations
[ds_volatile
],
4860 "%<volatile%> can only be specified for objects and "
4862 else if (decl_spec_seq_has_spec_p (declspecs
, ds_restrict
))
4863 error_at (declspecs
->locations
[ds_restrict
],
4864 "%<__restrict%> can only be specified for objects and "
4866 else if (decl_spec_seq_has_spec_p (declspecs
, ds_thread
))
4867 error_at (declspecs
->locations
[ds_thread
],
4868 "%<__thread%> can only be specified for objects "
4870 else if (saw_typedef
)
4871 warning_at (declspecs
->locations
[ds_typedef
], 0,
4872 "%<typedef%> was ignored in this declaration");
4873 else if (decl_spec_seq_has_spec_p (declspecs
, ds_constexpr
))
4874 error_at (declspecs
->locations
[ds_constexpr
],
4875 "%<constexpr%> cannot be used for type declarations");
4878 if (declspecs
->attributes
&& warn_attributes
&& declared_type
)
4881 if (!CLASS_TYPE_P (declared_type
)
4882 || !CLASSTYPE_TEMPLATE_INSTANTIATION (declared_type
))
4883 /* For a non-template class, use the name location. */
4884 loc
= location_of (declared_type
);
4886 /* For a template class (an explicit instantiation), use the
4887 current location. */
4888 loc
= input_location
;
4890 if (explicit_type_instantiation_p
)
4891 /* [dcl.attr.grammar]/4:
4893 No attribute-specifier-seq shall appertain to an explicit
4896 if (warning_at (loc
, OPT_Wattributes
,
4897 "attribute ignored in explicit instantiation %q#T",
4900 "no attribute can be applied to "
4901 "an explicit instantiation");
4904 warn_misplaced_attr_for_class_type (loc
, declared_type
);
4907 return declared_type
;
4910 /* Called when a declaration is seen that contains no names to declare.
4911 If its type is a reference to a structure, union or enum inherited
4912 from a containing scope, shadow that tag name for the current scope
4913 with a forward reference.
4914 If its type defines a new named structure or union
4915 or defines an enum, it is valid but we need not do anything here.
4916 Otherwise, it is an error.
4918 C++: may have to grok the declspecs to learn about static,
4919 complain for anonymous unions.
4921 Returns the TYPE declared -- or NULL_TREE if none. */
4924 shadow_tag (cp_decl_specifier_seq
*declspecs
)
4926 tree t
= check_tag_decl (declspecs
,
4927 /*explicit_type_instantiation_p=*/false);
4932 if (maybe_process_partial_specialization (t
) == error_mark_node
)
4935 /* This is where the variables in an anonymous union are
4936 declared. An anonymous union declaration looks like:
4938 because there is no declarator after the union, the parser
4939 sends that declaration here. */
4940 if (ANON_AGGR_TYPE_P (t
))
4942 fixup_anonymous_aggr (t
);
4944 if (TYPE_FIELDS (t
))
4946 tree decl
= grokdeclarator (/*declarator=*/NULL
,
4947 declspecs
, NORMAL
, 0, NULL
);
4948 finish_anon_union (decl
);
4955 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
4958 groktypename (cp_decl_specifier_seq
*type_specifiers
,
4959 const cp_declarator
*declarator
,
4960 bool is_template_arg
)
4964 enum decl_context context
4965 = is_template_arg
? TEMPLATE_TYPE_ARG
: TYPENAME
;
4966 attrs
= type_specifiers
->attributes
;
4967 type_specifiers
->attributes
= NULL_TREE
;
4968 type
= grokdeclarator (declarator
, type_specifiers
, context
, 0, &attrs
);
4969 if (attrs
&& type
!= error_mark_node
)
4971 if (CLASS_TYPE_P (type
))
4972 warning (OPT_Wattributes
, "ignoring attributes applied to class type %qT "
4973 "outside of definition", type
);
4974 else if (MAYBE_CLASS_TYPE_P (type
))
4975 /* A template type parameter or other dependent type. */
4976 warning (OPT_Wattributes
, "ignoring attributes applied to dependent "
4977 "type %qT without an associated declaration", type
);
4979 cplus_decl_attributes (&type
, attrs
, 0);
4984 /* Process a DECLARATOR for a function-scope variable declaration,
4985 namespace-scope variable declaration, or function declaration.
4986 (Function definitions go through start_function; class member
4987 declarations appearing in the body of the class go through
4988 grokfield.) The DECL corresponding to the DECLARATOR is returned.
4989 If an error occurs, the error_mark_node is returned instead.
4991 DECLSPECS are the decl-specifiers for the declaration. INITIALIZED is
4992 SD_INITIALIZED if an explicit initializer is present, or SD_DEFAULTED
4993 for an explicitly defaulted function, or SD_DELETED for an explicitly
4994 deleted function, but 0 (SD_UNINITIALIZED) if this is a variable
4995 implicitly initialized via a default constructor. ATTRIBUTES and
4996 PREFIX_ATTRIBUTES are GNU attributes associated with this declaration.
4998 The scope represented by the context of the returned DECL is pushed
4999 (if it is not the global namespace) and is assigned to
5000 *PUSHED_SCOPE_P. The caller is then responsible for calling
5001 pop_scope on *PUSHED_SCOPE_P if it is set. */
5004 start_decl (const cp_declarator
*declarator
,
5005 cp_decl_specifier_seq
*declspecs
,
5008 tree prefix_attributes
,
5009 tree
*pushed_scope_p
)
5017 *pushed_scope_p
= NULL_TREE
;
5019 /* An object declared as __attribute__((deprecated)) suppresses
5020 warnings of uses of other deprecated items. */
5021 if (lookup_attribute ("deprecated", attributes
))
5022 deprecated_state
= DEPRECATED_SUPPRESS
;
5024 attributes
= chainon (attributes
, prefix_attributes
);
5026 decl
= grokdeclarator (declarator
, declspecs
, NORMAL
, initialized
,
5029 deprecated_state
= DEPRECATED_NORMAL
;
5031 if (decl
== NULL_TREE
|| VOID_TYPE_P (decl
)
5032 || decl
== error_mark_node
)
5033 return error_mark_node
;
5035 context
= CP_DECL_CONTEXT (decl
);
5036 if (context
!= global_namespace
)
5037 *pushed_scope_p
= push_scope (context
);
5039 /* Is it valid for this decl to have an initializer at all?
5040 If not, set INITIALIZED to zero, which will indirectly
5041 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
5043 && TREE_CODE (decl
) == TYPE_DECL
)
5045 error ("typedef %qD is initialized (use decltype instead)", decl
);
5046 return error_mark_node
;
5051 if (! toplevel_bindings_p ()
5052 && DECL_EXTERNAL (decl
))
5053 warning (0, "declaration of %q#D has %<extern%> and is initialized",
5055 DECL_EXTERNAL (decl
) = 0;
5056 if (toplevel_bindings_p ())
5057 TREE_STATIC (decl
) = 1;
5059 alias
= lookup_attribute ("alias", DECL_ATTRIBUTES (decl
)) != 0;
5061 if (alias
&& TREE_CODE (decl
) == FUNCTION_DECL
)
5062 record_key_method_defined (decl
);
5064 /* If this is a typedef that names the class for linkage purposes
5065 (7.1.3p8), apply any attributes directly to the type. */
5066 if (TREE_CODE (decl
) == TYPE_DECL
5067 && OVERLOAD_TYPE_P (TREE_TYPE (decl
))
5068 && decl
== TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (decl
))))
5069 flags
= ATTR_FLAG_TYPE_IN_PLACE
;
5073 /* Set attributes here so if duplicate decl, will have proper attributes. */
5074 cplus_decl_attributes (&decl
, attributes
, flags
);
5076 /* Dllimported symbols cannot be defined. Static data members (which
5077 can be initialized in-class and dllimported) go through grokfield,
5078 not here, so we don't need to exclude those decls when checking for
5080 if (initialized
&& DECL_DLLIMPORT_P (decl
))
5082 error ("definition of %q#D is marked %<dllimport%>", decl
);
5083 DECL_DLLIMPORT_P (decl
) = 0;
5086 /* If #pragma weak was used, mark the decl weak now. */
5087 if (!processing_template_decl
&& !DECL_DECOMPOSITION_P (decl
))
5088 maybe_apply_pragma_weak (decl
);
5090 if (TREE_CODE (decl
) == FUNCTION_DECL
5091 && DECL_DECLARED_INLINE_P (decl
)
5092 && DECL_UNINLINABLE (decl
)
5093 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl
)))
5094 warning_at (DECL_SOURCE_LOCATION (decl
), 0,
5095 "inline function %qD given attribute noinline", decl
);
5097 if (TYPE_P (context
) && COMPLETE_TYPE_P (complete_type (context
)))
5099 bool this_tmpl
= (processing_template_decl
5100 > template_class_depth (context
));
5103 tree field
= lookup_field (context
, DECL_NAME (decl
), 0, false);
5104 if (field
== NULL_TREE
5105 || !(VAR_P (field
) || variable_template_p (field
)))
5106 error ("%q+#D is not a static data member of %q#T", decl
, context
);
5107 else if (variable_template_p (field
)
5108 && (DECL_LANG_SPECIFIC (decl
)
5109 && DECL_TEMPLATE_SPECIALIZATION (decl
)))
5110 /* OK, specialization was already checked. */;
5111 else if (variable_template_p (field
) && !this_tmpl
)
5113 error_at (DECL_SOURCE_LOCATION (decl
),
5114 "non-member-template declaration of %qD", decl
);
5115 inform (DECL_SOURCE_LOCATION (field
), "does not match "
5116 "member template declaration here");
5117 return error_mark_node
;
5121 if (variable_template_p (field
))
5122 field
= DECL_TEMPLATE_RESULT (field
);
5124 if (DECL_CONTEXT (field
) != context
)
5126 if (!same_type_p (DECL_CONTEXT (field
), context
))
5127 permerror (input_location
, "ISO C++ does not permit %<%T::%D%> "
5128 "to be defined as %<%T::%D%>",
5129 DECL_CONTEXT (field
), DECL_NAME (decl
),
5130 context
, DECL_NAME (decl
));
5131 DECL_CONTEXT (decl
) = DECL_CONTEXT (field
);
5133 /* Static data member are tricky; an in-class initialization
5134 still doesn't provide a definition, so the in-class
5135 declaration will have DECL_EXTERNAL set, but will have an
5136 initialization. Thus, duplicate_decls won't warn
5137 about this situation, and so we check here. */
5138 if (initialized
&& DECL_INITIALIZED_IN_CLASS_P (field
))
5139 error ("duplicate initialization of %qD", decl
);
5140 field
= duplicate_decls (decl
, field
,
5141 /*newdecl_is_friend=*/false);
5142 if (field
== error_mark_node
)
5143 return error_mark_node
;
5150 tree field
= check_classfn (context
, decl
,
5152 ? current_template_parms
5154 if (field
&& field
!= error_mark_node
5155 && duplicate_decls (decl
, field
,
5156 /*newdecl_is_friend=*/false))
5160 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
5161 DECL_IN_AGGR_P (decl
) = 0;
5162 /* Do not mark DECL as an explicit specialization if it was not
5163 already marked as an instantiation; a declaration should
5164 never be marked as a specialization unless we know what
5165 template is being specialized. */
5166 if (DECL_LANG_SPECIFIC (decl
) && DECL_USE_TEMPLATE (decl
))
5168 SET_DECL_TEMPLATE_SPECIALIZATION (decl
);
5169 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5170 DECL_COMDAT (decl
) = (TREE_PUBLIC (decl
)
5171 && DECL_DECLARED_INLINE_P (decl
));
5173 DECL_COMDAT (decl
) = false;
5175 /* [temp.expl.spec] An explicit specialization of a static data
5176 member of a template is a definition if the declaration
5177 includes an initializer; otherwise, it is a declaration.
5179 We check for processing_specialization so this only applies
5180 to the new specialization syntax. */
5181 if (!initialized
&& processing_specialization
)
5182 DECL_EXTERNAL (decl
) = 1;
5185 if (DECL_EXTERNAL (decl
) && ! DECL_TEMPLATE_SPECIALIZATION (decl
)
5186 /* Aliases are definitions. */
5188 permerror (input_location
, "declaration of %q#D outside of class is not definition",
5192 was_public
= TREE_PUBLIC (decl
);
5194 /* Enter this declaration into the symbol table. Don't push the plain
5195 VAR_DECL for a variable template. */
5196 if (!template_parm_scope_p ()
5198 decl
= maybe_push_decl (decl
);
5200 if (processing_template_decl
)
5201 decl
= push_template_decl (decl
);
5202 if (decl
== error_mark_node
)
5203 return error_mark_node
;
5206 && DECL_NAMESPACE_SCOPE_P (decl
) && !TREE_PUBLIC (decl
) && !was_public
5207 && !DECL_THIS_STATIC (decl
) && !DECL_ARTIFICIAL (decl
))
5209 /* This is a const variable with implicit 'static'. Set
5210 DECL_THIS_STATIC so we can tell it from variables that are
5211 !TREE_PUBLIC because of the anonymous namespace. */
5212 gcc_assert (CP_TYPE_CONST_P (TREE_TYPE (decl
)) || errorcount
);
5213 DECL_THIS_STATIC (decl
) = 1;
5216 if (current_function_decl
&& VAR_P (decl
)
5217 && DECL_DECLARED_CONSTEXPR_P (current_function_decl
))
5220 if (CP_DECL_THREAD_LOCAL_P (decl
))
5221 error ("%qD declared %<thread_local%> in %<constexpr%> function",
5223 else if (TREE_STATIC (decl
))
5224 error ("%qD declared %<static%> in %<constexpr%> function", decl
);
5228 cp_function_chain
->invalid_constexpr
= true;
5231 if (!processing_template_decl
&& VAR_P (decl
))
5232 start_decl_1 (decl
, initialized
);
5237 /* Process the declaration of a variable DECL. INITIALIZED is true
5238 iff DECL is explicitly initialized. (INITIALIZED is false if the
5239 variable is initialized via an implicitly-called constructor.)
5240 This function must be called for ordinary variables (including, for
5241 example, implicit instantiations of templates), but must not be
5242 called for template declarations. */
5245 start_decl_1 (tree decl
, bool initialized
)
5249 bool aggregate_definition_p
;
5251 gcc_assert (!processing_template_decl
);
5253 if (error_operand_p (decl
))
5256 gcc_assert (VAR_P (decl
));
5258 type
= TREE_TYPE (decl
);
5259 complete_p
= COMPLETE_TYPE_P (type
);
5260 aggregate_definition_p
= MAYBE_CLASS_TYPE_P (type
) && !DECL_EXTERNAL (decl
);
5262 /* If an explicit initializer is present, or if this is a definition
5263 of an aggregate, then we need a complete type at this point.
5264 (Scalars are always complete types, so there is nothing to
5265 check.) This code just sets COMPLETE_P; errors (if necessary)
5266 are issued below. */
5267 if ((initialized
|| aggregate_definition_p
)
5269 && COMPLETE_TYPE_P (complete_type (type
)))
5272 /* We will not yet have set TREE_READONLY on DECL if the type
5273 was "const", but incomplete, before this point. But, now, we
5274 have a complete type, so we can try again. */
5275 cp_apply_type_quals_to_decl (cp_type_quals (type
), decl
);
5279 /* Is it valid for this decl to have an initializer at all? */
5281 /* Don't allow initializations for incomplete types except for
5282 arrays which might be completed by the initialization. */
5284 ; /* A complete type is ok. */
5285 else if (type_uses_auto (type
))
5286 ; /* An auto type is ok. */
5287 else if (TREE_CODE (type
) != ARRAY_TYPE
)
5289 error ("variable %q#D has initializer but incomplete type", decl
);
5290 type
= TREE_TYPE (decl
) = error_mark_node
;
5292 else if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type
))))
5294 if (DECL_LANG_SPECIFIC (decl
) && DECL_TEMPLATE_INFO (decl
))
5295 error ("elements of array %q#D have incomplete type", decl
);
5296 /* else we already gave an error in start_decl. */
5299 else if (aggregate_definition_p
&& !complete_p
)
5301 if (type_uses_auto (type
))
5302 gcc_assert (CLASS_PLACEHOLDER_TEMPLATE (type
));
5305 error ("aggregate %q#D has incomplete type and cannot be defined",
5307 /* Change the type so that assemble_variable will give
5308 DECL an rtl we can live with: (mem (const_int 0)). */
5309 type
= TREE_TYPE (decl
) = error_mark_node
;
5313 /* Create a new scope to hold this declaration if necessary.
5314 Whether or not a new scope is necessary cannot be determined
5315 until after the type has been completed; if the type is a
5316 specialization of a class template it is not until after
5317 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
5318 will be set correctly. */
5319 maybe_push_cleanup_level (type
);
5322 /* Handle initialization of references. DECL, TYPE, and INIT have the
5323 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
5324 but will be set to a new CLEANUP_STMT if a temporary is created
5325 that must be destroyed subsequently.
5327 Returns an initializer expression to use to initialize DECL, or
5328 NULL if the initialization can be performed statically.
5330 Quotes on semantics can be found in ARM 8.4.3. */
5333 grok_reference_init (tree decl
, tree type
, tree init
, int flags
)
5335 if (init
== NULL_TREE
)
5337 if ((DECL_LANG_SPECIFIC (decl
) == 0
5338 || DECL_IN_AGGR_P (decl
) == 0)
5339 && ! DECL_THIS_EXTERN (decl
))
5340 error ("%qD declared as reference but not initialized", decl
);
5344 if (TREE_CODE (init
) == TREE_LIST
)
5345 init
= build_x_compound_expr_from_list (init
, ELK_INIT
,
5346 tf_warning_or_error
);
5348 tree ttype
= TREE_TYPE (type
);
5349 if (TREE_CODE (ttype
) != ARRAY_TYPE
5350 && TREE_CODE (TREE_TYPE (init
)) == ARRAY_TYPE
)
5351 /* Note: default conversion is only called in very special cases. */
5352 init
= decay_conversion (init
, tf_warning_or_error
);
5354 /* check_initializer handles this for non-reference variables, but for
5355 references we need to do it here or the initializer will get the
5356 incomplete array type and confuse later calls to
5357 cp_complete_array_type. */
5358 if (TREE_CODE (ttype
) == ARRAY_TYPE
5359 && TYPE_DOMAIN (ttype
) == NULL_TREE
5360 && (BRACE_ENCLOSED_INITIALIZER_P (init
)
5361 || TREE_CODE (init
) == STRING_CST
))
5363 cp_complete_array_type (&ttype
, init
, false);
5364 if (ttype
!= TREE_TYPE (type
))
5365 type
= cp_build_reference_type (ttype
, TYPE_REF_IS_RVALUE (type
));
5368 /* Convert INIT to the reference type TYPE. This may involve the
5369 creation of a temporary, whose lifetime must be the same as that
5370 of the reference. If so, a DECL_EXPR for the temporary will be
5371 added just after the DECL_EXPR for DECL. That's why we don't set
5372 DECL_INITIAL for local references (instead assigning to them
5373 explicitly); we need to allow the temporary to be initialized
5375 return initialize_reference (type
, init
, flags
,
5376 tf_warning_or_error
);
5379 /* Designated initializers in arrays are not supported in GNU C++.
5380 The parser cannot detect this error since it does not know whether
5381 a given brace-enclosed initializer is for a class type or for an
5382 array. This function checks that CE does not use a designated
5383 initializer. If it does, an error is issued. Returns true if CE
5384 is valid, i.e., does not have a designated initializer. */
5387 check_array_designated_initializer (constructor_elt
*ce
,
5388 unsigned HOST_WIDE_INT index
)
5390 /* Designated initializers for array elements are not supported. */
5393 /* The parser only allows identifiers as designated
5395 if (ce
->index
== error_mark_node
)
5397 error ("name used in a GNU-style designated "
5398 "initializer for an array");
5401 else if (identifier_p (ce
->index
))
5403 error ("name %qD used in a GNU-style designated "
5404 "initializer for an array", ce
->index
);
5408 tree ce_index
= build_expr_type_conversion (WANT_INT
| WANT_ENUM
,
5411 && INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (ce_index
))
5412 && (TREE_CODE (ce_index
= fold_non_dependent_expr (ce_index
))
5415 /* A C99 designator is OK if it matches the current index. */
5416 if (wi::to_wide (ce_index
) == index
)
5418 ce
->index
= ce_index
;
5422 sorry ("non-trivial designated initializers not supported");
5425 error ("C99 designator %qE is not an integral constant-expression",
5434 /* When parsing `int a[] = {1, 2};' we don't know the size of the
5435 array until we finish parsing the initializer. If that's the
5436 situation we're in, update DECL accordingly. */
5439 maybe_deduce_size_from_array_init (tree decl
, tree init
)
5441 tree type
= TREE_TYPE (decl
);
5443 if (TREE_CODE (type
) == ARRAY_TYPE
5444 && TYPE_DOMAIN (type
) == NULL_TREE
5445 && TREE_CODE (decl
) != TYPE_DECL
)
5447 /* do_default is really a C-ism to deal with tentative definitions.
5448 But let's leave it here to ease the eventual merge. */
5449 int do_default
= !DECL_EXTERNAL (decl
);
5450 tree initializer
= init
? init
: DECL_INITIAL (decl
);
5453 /* Check that there are no designated initializers in INIT, as
5454 those are not supported in GNU C++, and as the middle-end
5455 will crash if presented with a non-numeric designated
5457 if (initializer
&& BRACE_ENCLOSED_INITIALIZER_P (initializer
))
5459 vec
<constructor_elt
, va_gc
> *v
= CONSTRUCTOR_ELTS (initializer
);
5460 constructor_elt
*ce
;
5462 FOR_EACH_VEC_SAFE_ELT (v
, i
, ce
)
5464 if (instantiation_dependent_expression_p (ce
->index
))
5466 if (!check_array_designated_initializer (ce
, i
))
5472 TREE_TYPE (decl
) = error_mark_node
;
5475 failure
= cp_complete_array_type (&TREE_TYPE (decl
), initializer
,
5479 error_at (cp_expr_loc_or_loc (initializer
,
5480 DECL_SOURCE_LOCATION (decl
)),
5481 "initializer fails to determine size of %qD", decl
);
5483 else if (failure
== 2)
5487 error_at (DECL_SOURCE_LOCATION (decl
),
5488 "array size missing in %qD", decl
);
5490 /* If a `static' var's size isn't known, make it extern as
5491 well as static, so it does not get allocated. If it's not
5492 `static', then don't mark it extern; finish_incomplete_decl
5493 will give it a default size and it will get allocated. */
5494 else if (!pedantic
&& TREE_STATIC (decl
) && !TREE_PUBLIC (decl
))
5495 DECL_EXTERNAL (decl
) = 1;
5497 else if (failure
== 3)
5499 error_at (DECL_SOURCE_LOCATION (decl
),
5500 "zero-size array %qD", decl
);
5504 cp_apply_type_quals_to_decl (cp_type_quals (TREE_TYPE (decl
)), decl
);
5506 relayout_decl (decl
);
5510 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
5511 any appropriate error messages regarding the layout. */
5514 layout_var_decl (tree decl
)
5518 type
= TREE_TYPE (decl
);
5519 if (type
== error_mark_node
)
5522 /* If we haven't already laid out this declaration, do so now.
5523 Note that we must not call complete type for an external object
5524 because it's type might involve templates that we are not
5525 supposed to instantiate yet. (And it's perfectly valid to say
5526 `extern X x' for some incomplete type `X'.) */
5527 if (!DECL_EXTERNAL (decl
))
5528 complete_type (type
);
5529 if (!DECL_SIZE (decl
)
5530 && TREE_TYPE (decl
) != error_mark_node
5531 && complete_or_array_type_p (type
))
5532 layout_decl (decl
, 0);
5534 if (!DECL_EXTERNAL (decl
) && DECL_SIZE (decl
) == NULL_TREE
)
5536 /* An automatic variable with an incomplete type: that is an error.
5537 Don't talk about array types here, since we took care of that
5538 message in grokdeclarator. */
5539 error_at (DECL_SOURCE_LOCATION (decl
),
5540 "storage size of %qD isn%'t known", decl
);
5541 TREE_TYPE (decl
) = error_mark_node
;
5544 /* Keep this code around in case we later want to control debug info
5545 based on whether a type is "used". (jason 1999-11-11) */
5547 else if (!DECL_EXTERNAL (decl
) && MAYBE_CLASS_TYPE_P (ttype
))
5548 /* Let debugger know it should output info for this type. */
5549 note_debug_info_needed (ttype
);
5551 if (TREE_STATIC (decl
) && DECL_CLASS_SCOPE_P (decl
))
5552 note_debug_info_needed (DECL_CONTEXT (decl
));
5555 if ((DECL_EXTERNAL (decl
) || TREE_STATIC (decl
))
5556 && DECL_SIZE (decl
) != NULL_TREE
5557 && ! TREE_CONSTANT (DECL_SIZE (decl
)))
5559 if (TREE_CODE (DECL_SIZE (decl
)) == INTEGER_CST
)
5560 constant_expression_warning (DECL_SIZE (decl
));
5563 error_at (DECL_SOURCE_LOCATION (decl
),
5564 "storage size of %qD isn%'t constant", decl
);
5565 TREE_TYPE (decl
) = error_mark_node
;
5570 /* If a local static variable is declared in an inline function, or if
5571 we have a weak definition, we must endeavor to create only one
5572 instance of the variable at link-time. */
5575 maybe_commonize_var (tree decl
)
5577 /* Static data in a function with comdat linkage also has comdat
5579 if ((TREE_STATIC (decl
)
5580 /* Don't mess with __FUNCTION__. */
5581 && ! DECL_ARTIFICIAL (decl
)
5582 && DECL_FUNCTION_SCOPE_P (decl
)
5583 && vague_linkage_p (DECL_CONTEXT (decl
)))
5584 || (TREE_PUBLIC (decl
) && DECL_INLINE_VAR_P (decl
)))
5588 /* With weak symbols, we simply make the variable COMDAT;
5589 that will cause copies in multiple translations units to
5591 comdat_linkage (decl
);
5595 if (DECL_INITIAL (decl
) == NULL_TREE
5596 || DECL_INITIAL (decl
) == error_mark_node
)
5598 /* Without weak symbols, we can use COMMON to merge
5599 uninitialized variables. */
5600 TREE_PUBLIC (decl
) = 1;
5601 DECL_COMMON (decl
) = 1;
5605 /* While for initialized variables, we must use internal
5606 linkage -- which means that multiple copies will not
5608 TREE_PUBLIC (decl
) = 0;
5609 DECL_COMMON (decl
) = 0;
5611 if (DECL_INLINE_VAR_P (decl
))
5612 msg
= G_("sorry: semantics of inline variable "
5613 "%q#D are wrong (you%'ll wind up with "
5614 "multiple copies)");
5616 msg
= G_("sorry: semantics of inline function "
5617 "static data %q#D are wrong (you%'ll wind "
5618 "up with multiple copies)");
5619 if (warning_at (DECL_SOURCE_LOCATION (decl
), 0,
5621 inform (DECL_SOURCE_LOCATION (decl
),
5622 "you can work around this by removing the initializer");
5628 /* Issue an error message if DECL is an uninitialized const variable.
5629 CONSTEXPR_CONTEXT_P is true when the function is called in a constexpr
5630 context from potential_constant_expression. Returns true if all is well,
5634 check_for_uninitialized_const_var (tree decl
, bool constexpr_context_p
,
5635 tsubst_flags_t complain
)
5637 tree type
= strip_array_types (TREE_TYPE (decl
));
5639 /* ``Unless explicitly declared extern, a const object does not have
5640 external linkage and must be initialized. ($8.4; $12.1)'' ARM
5643 && !TYPE_REF_P (type
)
5644 && (constexpr_context_p
5645 || CP_TYPE_CONST_P (type
) || var_in_constexpr_fn (decl
))
5646 && !DECL_NONTRIVIALLY_INITIALIZED_P (decl
))
5648 tree field
= default_init_uninitialized_part (type
);
5652 if (!constexpr_context_p
)
5654 if (CP_TYPE_CONST_P (type
))
5656 if (complain
& tf_error
)
5657 permerror (DECL_SOURCE_LOCATION (decl
),
5658 "uninitialized const %qD", decl
);
5662 if (!is_instantiation_of_constexpr (current_function_decl
)
5663 && (complain
& tf_error
))
5664 error_at (DECL_SOURCE_LOCATION (decl
),
5665 "uninitialized variable %qD in %<constexpr%> "
5667 cp_function_chain
->invalid_constexpr
= true;
5670 else if (complain
& tf_error
)
5671 error_at (DECL_SOURCE_LOCATION (decl
),
5672 "uninitialized variable %qD in %<constexpr%> context",
5675 if (CLASS_TYPE_P (type
) && (complain
& tf_error
))
5677 tree defaulted_ctor
;
5679 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (type
)),
5680 "%q#T has no user-provided default constructor", type
);
5681 defaulted_ctor
= in_class_defaulted_default_constructor (type
);
5683 inform (DECL_SOURCE_LOCATION (defaulted_ctor
),
5684 "constructor is not user-provided because it is "
5685 "explicitly defaulted in the class body");
5686 inform (DECL_SOURCE_LOCATION (field
),
5687 "and the implicitly-defined constructor does not "
5688 "initialize %q#D", field
);
5697 /* Structure holding the current initializer being processed by reshape_init.
5698 CUR is a pointer to the current element being processed, END is a pointer
5699 after the last element present in the initializer. */
5702 constructor_elt
*cur
;
5703 constructor_elt
*end
;
5706 static tree
reshape_init_r (tree
, reshape_iter
*, bool, tsubst_flags_t
);
5708 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
5709 returned is the next FIELD_DECL (possibly FIELD itself) that can be
5710 initialized. If there are no more such fields, the return value
5714 next_initializable_field (tree field
)
5717 && (TREE_CODE (field
) != FIELD_DECL
5718 || DECL_UNNAMED_BIT_FIELD (field
)
5719 || (DECL_ARTIFICIAL (field
)
5720 && !(cxx_dialect
>= cxx17
&& DECL_FIELD_IS_BASE (field
)))))
5721 field
= DECL_CHAIN (field
);
5726 /* Return true for [dcl.init.list] direct-list-initialization from
5727 single element of enumeration with a fixed underlying type. */
5730 is_direct_enum_init (tree type
, tree init
)
5732 if (cxx_dialect
>= cxx17
5733 && TREE_CODE (type
) == ENUMERAL_TYPE
5734 && ENUM_FIXED_UNDERLYING_TYPE_P (type
)
5735 && TREE_CODE (init
) == CONSTRUCTOR
5736 && CONSTRUCTOR_IS_DIRECT_INIT (init
)
5737 && CONSTRUCTOR_NELTS (init
) == 1)
5742 /* Subroutine of reshape_init_array and reshape_init_vector, which does
5743 the actual work. ELT_TYPE is the element type of the array. MAX_INDEX is an
5744 INTEGER_CST representing the size of the array minus one (the maximum index),
5745 or NULL_TREE if the array was declared without specifying the size. D is
5746 the iterator within the constructor. */
5749 reshape_init_array_1 (tree elt_type
, tree max_index
, reshape_iter
*d
,
5750 tsubst_flags_t complain
)
5753 bool sized_array_p
= (max_index
&& TREE_CONSTANT (max_index
));
5754 unsigned HOST_WIDE_INT max_index_cst
= 0;
5755 unsigned HOST_WIDE_INT index
;
5757 /* The initializer for an array is always a CONSTRUCTOR. */
5758 new_init
= build_constructor (init_list_type_node
, NULL
);
5762 /* Minus 1 is used for zero sized arrays. */
5763 if (integer_all_onesp (max_index
))
5766 if (tree_fits_uhwi_p (max_index
))
5767 max_index_cst
= tree_to_uhwi (max_index
);
5768 /* sizetype is sign extended, not zero extended. */
5770 max_index_cst
= tree_to_uhwi (fold_convert (size_type_node
, max_index
));
5773 /* Loop until there are no more initializers. */
5775 d
->cur
!= d
->end
&& (!sized_array_p
|| index
<= max_index_cst
);
5779 constructor_elt
*old_cur
= d
->cur
;
5781 check_array_designated_initializer (d
->cur
, index
);
5782 elt_init
= reshape_init_r (elt_type
, d
, /*first_initializer_p=*/false,
5784 if (elt_init
== error_mark_node
)
5785 return error_mark_node
;
5786 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init
),
5787 size_int (index
), elt_init
);
5788 if (!TREE_CONSTANT (elt_init
))
5789 TREE_CONSTANT (new_init
) = false;
5791 /* This can happen with an invalid initializer (c++/54501). */
5792 if (d
->cur
== old_cur
&& !sized_array_p
)
5799 /* Subroutine of reshape_init_r, processes the initializers for arrays.
5800 Parameters are the same of reshape_init_r. */
5803 reshape_init_array (tree type
, reshape_iter
*d
, tsubst_flags_t complain
)
5805 tree max_index
= NULL_TREE
;
5807 gcc_assert (TREE_CODE (type
) == ARRAY_TYPE
);
5809 if (TYPE_DOMAIN (type
))
5810 max_index
= array_type_nelts (type
);
5812 return reshape_init_array_1 (TREE_TYPE (type
), max_index
, d
, complain
);
5815 /* Subroutine of reshape_init_r, processes the initializers for vectors.
5816 Parameters are the same of reshape_init_r. */
5819 reshape_init_vector (tree type
, reshape_iter
*d
, tsubst_flags_t complain
)
5821 tree max_index
= NULL_TREE
;
5823 gcc_assert (VECTOR_TYPE_P (type
));
5825 if (COMPOUND_LITERAL_P (d
->cur
->value
))
5827 tree value
= d
->cur
->value
;
5828 if (!same_type_p (TREE_TYPE (value
), type
))
5830 if (complain
& tf_error
)
5831 error ("invalid type %qT as initializer for a vector of type %qT",
5832 TREE_TYPE (d
->cur
->value
), type
);
5833 value
= error_mark_node
;
5839 /* For a vector, we initialize it as an array of the appropriate size. */
5840 if (VECTOR_TYPE_P (type
))
5841 max_index
= size_int (TYPE_VECTOR_SUBPARTS (type
) - 1);
5843 return reshape_init_array_1 (TREE_TYPE (type
), max_index
, d
, complain
);
5846 /* Subroutine of reshape_init_r, processes the initializers for classes
5847 or union. Parameters are the same of reshape_init_r. */
5850 reshape_init_class (tree type
, reshape_iter
*d
, bool first_initializer_p
,
5851 tsubst_flags_t complain
)
5856 gcc_assert (CLASS_TYPE_P (type
));
5858 /* The initializer for a class is always a CONSTRUCTOR. */
5859 new_init
= build_constructor (init_list_type_node
, NULL
);
5860 field
= next_initializable_field (TYPE_FIELDS (type
));
5866 An initializer for an aggregate member that is an
5867 empty class shall have the form of an empty
5868 initializer-list {}. */
5869 if (!first_initializer_p
)
5871 if (complain
& tf_error
)
5872 error ("initializer for %qT must be brace-enclosed", type
);
5873 return error_mark_node
;
5878 /* Loop through the initializable fields, gathering initializers. */
5879 while (d
->cur
!= d
->end
)
5882 constructor_elt
*old_cur
= d
->cur
;
5884 /* Handle designated initializers, as an extension. */
5887 if (d
->cur
->index
== error_mark_node
)
5888 return error_mark_node
;
5890 if (TREE_CODE (d
->cur
->index
) == FIELD_DECL
)
5892 /* We already reshaped this. */
5893 if (field
!= d
->cur
->index
)
5895 tree id
= DECL_NAME (d
->cur
->index
);
5897 gcc_checking_assert (d
->cur
->index
5898 == get_class_binding (type
, id
, false));
5899 field
= d
->cur
->index
;
5902 else if (TREE_CODE (d
->cur
->index
) == IDENTIFIER_NODE
)
5903 field
= get_class_binding (type
, d
->cur
->index
, false);
5906 if (complain
& tf_error
)
5907 error ("%<[%E] =%> used in a GNU-style designated initializer"
5908 " for class %qT", d
->cur
->index
, type
);
5909 return error_mark_node
;
5912 if (!field
|| TREE_CODE (field
) != FIELD_DECL
)
5914 if (complain
& tf_error
)
5915 error ("%qT has no non-static data member named %qD", type
,
5917 return error_mark_node
;
5921 /* If we processed all the member of the class, we are done. */
5925 field_init
= reshape_init_r (TREE_TYPE (field
), d
,
5926 /*first_initializer_p=*/false, complain
);
5927 if (field_init
== error_mark_node
)
5928 return error_mark_node
;
5930 if (d
->cur
== old_cur
&& d
->cur
->index
)
5932 /* This can happen with an invalid initializer for a flexible
5933 array member (c++/54441). */
5934 if (complain
& tf_error
)
5935 error ("invalid initializer for %q#D", field
);
5936 return error_mark_node
;
5939 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init
), field
, field_init
);
5943 When a union is initialized with a brace-enclosed
5944 initializer, the braces shall only contain an
5945 initializer for the first member of the union. */
5946 if (TREE_CODE (type
) == UNION_TYPE
)
5949 field
= next_initializable_field (DECL_CHAIN (field
));
5955 /* Subroutine of reshape_init_r. We're in a context where C99 initializer
5956 designators are not valid; either complain or return true to indicate
5957 that reshape_init_r should return error_mark_node. */
5960 has_designator_problem (reshape_iter
*d
, tsubst_flags_t complain
)
5964 if (complain
& tf_error
)
5965 error ("C99 designator %qE outside aggregate initializer",
5973 /* Subroutine of reshape_init, which processes a single initializer (part of
5974 a CONSTRUCTOR). TYPE is the type of the variable being initialized, D is the
5975 iterator within the CONSTRUCTOR which points to the initializer to process.
5976 FIRST_INITIALIZER_P is true if this is the first initializer of the
5977 outermost CONSTRUCTOR node. */
5980 reshape_init_r (tree type
, reshape_iter
*d
, bool first_initializer_p
,
5981 tsubst_flags_t complain
)
5983 tree init
= d
->cur
->value
;
5985 if (error_operand_p (init
))
5986 return error_mark_node
;
5988 if (first_initializer_p
&& !CP_AGGREGATE_TYPE_P (type
)
5989 && has_designator_problem (d
, complain
))
5990 return error_mark_node
;
5992 if (TREE_CODE (type
) == COMPLEX_TYPE
)
5994 /* A complex type can be initialized from one or two initializers,
5995 but braces are not elided. */
5997 if (BRACE_ENCLOSED_INITIALIZER_P (init
))
5999 if (CONSTRUCTOR_NELTS (init
) > 2)
6001 if (complain
& tf_error
)
6002 error ("too many initializers for %qT", type
);
6004 return error_mark_node
;
6007 else if (first_initializer_p
&& d
->cur
!= d
->end
)
6009 vec
<constructor_elt
, va_gc
> *v
= 0;
6010 CONSTRUCTOR_APPEND_ELT (v
, NULL_TREE
, init
);
6011 CONSTRUCTOR_APPEND_ELT (v
, NULL_TREE
, d
->cur
->value
);
6012 if (has_designator_problem (d
, complain
))
6013 return error_mark_node
;
6015 init
= build_constructor (init_list_type_node
, v
);
6020 /* A non-aggregate type is always initialized with a single
6022 if (!CP_AGGREGATE_TYPE_P (type
))
6024 /* It is invalid to initialize a non-aggregate type with a
6025 brace-enclosed initializer before C++0x.
6026 We need to check for BRACE_ENCLOSED_INITIALIZER_P here because
6027 of g++.old-deja/g++.mike/p7626.C: a pointer-to-member constant is
6028 a CONSTRUCTOR (with a record type). */
6029 if (TREE_CODE (init
) == CONSTRUCTOR
6030 /* Don't complain about a capture-init. */
6031 && !CONSTRUCTOR_IS_DIRECT_INIT (init
)
6032 && BRACE_ENCLOSED_INITIALIZER_P (init
)) /* p7626.C */
6034 if (SCALAR_TYPE_P (type
))
6036 if (cxx_dialect
< cxx11
6037 /* Isn't value-initialization. */
6038 || CONSTRUCTOR_NELTS (init
) > 0)
6040 if (complain
& tf_error
)
6041 error ("braces around scalar initializer for type %qT",
6043 init
= error_mark_node
;
6047 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS
);
6054 /* "If T is a class type and the initializer list has a single element of
6055 type cv U, where U is T or a class derived from T, the object is
6056 initialized from that element." Even if T is an aggregate. */
6057 if (cxx_dialect
>= cxx11
&& (CLASS_TYPE_P (type
) || VECTOR_TYPE_P (type
))
6058 && first_initializer_p
6059 && d
->end
- d
->cur
== 1
6060 && reference_related_p (type
, TREE_TYPE (init
)))
6068 All implicit type conversions (clause _conv_) are considered when
6069 initializing the aggregate member with an initializer from an
6070 initializer-list. If the initializer can initialize a member,
6071 the member is initialized. Otherwise, if the member is itself a
6072 non-empty subaggregate, brace elision is assumed and the
6073 initializer is considered for the initialization of the first
6074 member of the subaggregate. */
6075 if (TREE_CODE (init
) != CONSTRUCTOR
6076 /* But don't try this for the first initializer, since that would be
6077 looking through the outermost braces; A a2 = { a1 }; is not a
6078 valid aggregate initialization. */
6079 && !first_initializer_p
6080 && (same_type_ignoring_top_level_qualifiers_p (type
, TREE_TYPE (init
))
6081 || can_convert_arg (type
, TREE_TYPE (init
), init
, LOOKUP_NORMAL
,
6088 /* [dcl.init.string]
6090 A char array (whether plain char, signed char, or unsigned char)
6091 can be initialized by a string-literal (optionally enclosed in
6092 braces); a wchar_t array can be initialized by a wide
6093 string-literal (optionally enclosed in braces). */
6094 if (TREE_CODE (type
) == ARRAY_TYPE
6095 && char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (type
))))
6097 tree str_init
= init
;
6099 /* Strip one level of braces if and only if they enclose a single
6100 element (as allowed by [dcl.init.string]). */
6101 if (!first_initializer_p
6102 && TREE_CODE (str_init
) == CONSTRUCTOR
6103 && CONSTRUCTOR_NELTS (str_init
) == 1)
6105 str_init
= (*CONSTRUCTOR_ELTS (str_init
))[0].value
;
6108 /* If it's a string literal, then it's the initializer for the array
6109 as a whole. Otherwise, continue with normal initialization for
6110 array types (one value per array element). */
6111 if (TREE_CODE (str_init
) == STRING_CST
)
6113 if (has_designator_problem (d
, complain
))
6114 return error_mark_node
;
6120 /* The following cases are about aggregates. If we are not within a full
6121 initializer already, and there is not a CONSTRUCTOR, it means that there
6122 is a missing set of braces (that is, we are processing the case for
6123 which reshape_init exists). */
6124 if (!first_initializer_p
)
6126 if (TREE_CODE (init
) == CONSTRUCTOR
)
6128 if (TREE_TYPE (init
) && TYPE_PTRMEMFUNC_P (TREE_TYPE (init
)))
6129 /* There is no need to reshape pointer-to-member function
6130 initializers, as they are always constructed correctly
6131 by the front end. */
6133 else if (COMPOUND_LITERAL_P (init
))
6134 /* For a nested compound literal, there is no need to reshape since
6135 brace elision is not allowed. Even if we decided to allow it,
6136 we should add a call to reshape_init in finish_compound_literal,
6137 before calling digest_init, so changing this code would still
6138 not be necessary. */
6139 gcc_assert (!BRACE_ENCLOSED_INITIALIZER_P (init
));
6143 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init
));
6144 return reshape_init (type
, init
, complain
);
6148 if (complain
& tf_warning
)
6149 warning (OPT_Wmissing_braces
,
6150 "missing braces around initializer for %qT",
6154 /* Dispatch to specialized routines. */
6155 if (CLASS_TYPE_P (type
))
6156 return reshape_init_class (type
, d
, first_initializer_p
, complain
);
6157 else if (TREE_CODE (type
) == ARRAY_TYPE
)
6158 return reshape_init_array (type
, d
, complain
);
6159 else if (VECTOR_TYPE_P (type
))
6160 return reshape_init_vector (type
, d
, complain
);
6165 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
6166 brace-enclosed aggregate initializer.
6168 INIT is the CONSTRUCTOR containing the list of initializers describing
6169 a brace-enclosed initializer for an entity of the indicated aggregate TYPE.
6170 It may not presently match the shape of the TYPE; for example:
6172 struct S { int a; int b; };
6173 struct S a[] = { 1, 2, 3, 4 };
6175 Here INIT will hold a vector of four elements, rather than a
6176 vector of two elements, each itself a vector of two elements. This
6177 routine transforms INIT from the former form into the latter. The
6178 revised CONSTRUCTOR node is returned. */
6181 reshape_init (tree type
, tree init
, tsubst_flags_t complain
)
6183 vec
<constructor_elt
, va_gc
> *v
;
6187 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init
));
6189 v
= CONSTRUCTOR_ELTS (init
);
6191 /* An empty constructor does not need reshaping, and it is always a valid
6193 if (vec_safe_is_empty (v
))
6196 /* Handle [dcl.init.list] direct-list-initialization from
6197 single element of enumeration with a fixed underlying type. */
6198 if (is_direct_enum_init (type
, init
))
6200 tree elt
= CONSTRUCTOR_ELT (init
, 0)->value
;
6201 type
= cv_unqualified (type
);
6202 if (check_narrowing (ENUM_UNDERLYING_TYPE (type
), elt
, complain
))
6204 warning_sentinel
w (warn_useless_cast
);
6205 warning_sentinel
w2 (warn_ignored_qualifiers
);
6206 return cp_build_c_cast (type
, elt
, tf_warning_or_error
);
6209 return error_mark_node
;
6212 /* Recurse on this CONSTRUCTOR. */
6214 d
.end
= d
.cur
+ v
->length ();
6216 new_init
= reshape_init_r (type
, &d
, true, complain
);
6217 if (new_init
== error_mark_node
)
6218 return error_mark_node
;
6220 /* Make sure all the element of the constructor were used. Otherwise,
6221 issue an error about exceeding initializers. */
6224 if (complain
& tf_error
)
6225 error ("too many initializers for %qT", type
);
6226 return error_mark_node
;
6229 if (CONSTRUCTOR_IS_DIRECT_INIT (init
)
6230 && BRACE_ENCLOSED_INITIALIZER_P (new_init
))
6231 CONSTRUCTOR_IS_DIRECT_INIT (new_init
) = true;
6236 /* Verify array initializer. Returns true if errors have been reported. */
6239 check_array_initializer (tree decl
, tree type
, tree init
)
6241 tree element_type
= TREE_TYPE (type
);
6243 /* The array type itself need not be complete, because the
6244 initializer may tell us how many elements are in the array.
6245 But, the elements of the array must be complete. */
6246 if (!COMPLETE_TYPE_P (complete_type (element_type
)))
6249 error_at (DECL_SOURCE_LOCATION (decl
),
6250 "elements of array %q#D have incomplete type", decl
);
6252 error ("elements of array %q#T have incomplete type", type
);
6255 /* A compound literal can't have variable size. */
6257 && ((COMPLETE_TYPE_P (type
) && !TREE_CONSTANT (TYPE_SIZE (type
)))
6258 || !TREE_CONSTANT (TYPE_SIZE (element_type
))))
6260 error ("variable-sized compound literal");
6266 /* Subroutine of check_initializer; args are passed down from that function.
6267 Set stmts_are_full_exprs_p to 1 across a call to build_aggr_init. */
6270 build_aggr_init_full_exprs (tree decl
, tree init
, int flags
)
6273 gcc_assert (stmts_are_full_exprs_p ());
6274 return build_aggr_init (decl
, init
, flags
, tf_warning_or_error
);
6277 /* Verify INIT (the initializer for DECL), and record the
6278 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
6279 grok_reference_init.
6281 If the return value is non-NULL, it is an expression that must be
6282 evaluated dynamically to initialize DECL. */
6285 check_initializer (tree decl
, tree init
, int flags
, vec
<tree
, va_gc
> **cleanups
)
6287 tree type
= TREE_TYPE (decl
);
6288 tree init_code
= NULL
;
6291 /* Things that are going to be initialized need to have complete
6293 TREE_TYPE (decl
) = type
= complete_type (TREE_TYPE (decl
));
6295 if (DECL_HAS_VALUE_EXPR_P (decl
))
6297 /* A variable with DECL_HAS_VALUE_EXPR_P set is just a placeholder,
6298 it doesn't have storage to be initialized. */
6299 gcc_assert (init
== NULL_TREE
);
6303 if (type
== error_mark_node
)
6304 /* We will have already complained. */
6307 if (TREE_CODE (type
) == ARRAY_TYPE
)
6309 if (check_array_initializer (decl
, type
, init
))
6312 else if (!COMPLETE_TYPE_P (type
))
6314 error_at (DECL_SOURCE_LOCATION (decl
),
6315 "%q#D has incomplete type", decl
);
6316 TREE_TYPE (decl
) = error_mark_node
;
6320 /* There is no way to make a variable-sized class type in GNU C++. */
6321 gcc_assert (TREE_CONSTANT (TYPE_SIZE (type
)));
6323 if (init
&& BRACE_ENCLOSED_INITIALIZER_P (init
))
6325 int init_len
= CONSTRUCTOR_NELTS (init
);
6326 if (SCALAR_TYPE_P (type
))
6330 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS
);
6331 init
= build_zero_init (type
, NULL_TREE
, false);
6333 else if (init_len
!= 1 && TREE_CODE (type
) != COMPLEX_TYPE
)
6335 error_at (cp_expr_loc_or_loc (init
, DECL_SOURCE_LOCATION (decl
)),
6336 "scalar object %qD requires one element in "
6337 "initializer", decl
);
6338 TREE_TYPE (decl
) = error_mark_node
;
6344 if (TREE_CODE (decl
) == CONST_DECL
)
6346 gcc_assert (!TYPE_REF_P (type
));
6348 DECL_INITIAL (decl
) = init
;
6350 gcc_assert (init
!= NULL_TREE
);
6353 else if (!init
&& DECL_REALLY_EXTERN (decl
))
6355 else if (init
|| type_build_ctor_call (type
)
6356 || TYPE_REF_P (type
))
6358 if (TYPE_REF_P (type
))
6360 init
= grok_reference_init (decl
, type
, init
, flags
);
6361 flags
|= LOOKUP_ALREADY_DIGESTED
;
6364 check_for_uninitialized_const_var (decl
, /*constexpr_context_p=*/false,
6365 tf_warning_or_error
);
6366 /* Do not reshape constructors of vectors (they don't need to be
6368 else if (BRACE_ENCLOSED_INITIALIZER_P (init
))
6370 if (is_std_init_list (type
))
6372 init
= perform_implicit_conversion (type
, init
,
6373 tf_warning_or_error
);
6374 flags
|= LOOKUP_ALREADY_DIGESTED
;
6376 else if (TYPE_NON_AGGREGATE_CLASS (type
))
6378 /* Don't reshape if the class has constructors. */
6379 if (cxx_dialect
== cxx98
)
6380 error_at (cp_expr_loc_or_loc (init
, DECL_SOURCE_LOCATION (decl
)),
6381 "in C++98 %qD must be initialized by "
6382 "constructor, not by %<{...}%>",
6385 else if (VECTOR_TYPE_P (type
) && TYPE_VECTOR_OPAQUE (type
))
6387 error ("opaque vector types cannot be initialized");
6388 init
= error_mark_node
;
6392 init
= reshape_init (type
, init
, tf_warning_or_error
);
6393 flags
|= LOOKUP_NO_NARROWING
;
6396 else if (TREE_CODE (init
) == TREE_LIST
6397 && TREE_TYPE (init
) != unknown_type_node
6398 && !MAYBE_CLASS_TYPE_P (type
))
6400 gcc_assert (TREE_CODE (decl
) != RESULT_DECL
);
6402 /* We get here with code like `int a (2);' */
6403 init
= build_x_compound_expr_from_list (init
, ELK_INIT
,
6404 tf_warning_or_error
);
6407 /* If DECL has an array type without a specific bound, deduce the
6408 array size from the initializer. */
6409 maybe_deduce_size_from_array_init (decl
, init
);
6410 type
= TREE_TYPE (decl
);
6411 if (type
== error_mark_node
)
6414 if (((type_build_ctor_call (type
) || CLASS_TYPE_P (type
))
6415 && !(flags
& LOOKUP_ALREADY_DIGESTED
)
6416 && !(init
&& BRACE_ENCLOSED_INITIALIZER_P (init
)
6417 && CP_AGGREGATE_TYPE_P (type
)
6418 && (CLASS_TYPE_P (type
)
6419 || !TYPE_NEEDS_CONSTRUCTING (type
)
6420 || type_has_extended_temps (type
))))
6421 || (DECL_DECOMPOSITION_P (decl
) && TREE_CODE (type
) == ARRAY_TYPE
))
6423 init_code
= build_aggr_init_full_exprs (decl
, init
, flags
);
6425 /* A constructor call is a non-trivial initializer even if
6426 it isn't explicitly written. */
6427 if (TREE_SIDE_EFFECTS (init_code
))
6428 DECL_NONTRIVIALLY_INITIALIZED_P (decl
) = true;
6430 /* If this is a constexpr initializer, expand_default_init will
6431 have returned an INIT_EXPR rather than a CALL_EXPR. In that
6432 case, pull the initializer back out and pass it down into
6433 store_init_value. */
6434 while (TREE_CODE (init_code
) == EXPR_STMT
6435 || TREE_CODE (init_code
) == CONVERT_EXPR
)
6436 init_code
= TREE_OPERAND (init_code
, 0);
6437 if (TREE_CODE (init_code
) == INIT_EXPR
)
6439 init
= TREE_OPERAND (init_code
, 1);
6440 init_code
= NULL_TREE
;
6441 /* Don't call digest_init; it's unnecessary and will complain
6442 about aggregate initialization of non-aggregate classes. */
6443 flags
|= LOOKUP_ALREADY_DIGESTED
;
6445 else if (DECL_DECLARED_CONSTEXPR_P (decl
))
6447 /* Declared constexpr, but no suitable initializer; massage
6448 init appropriately so we can pass it into store_init_value
6450 if (CLASS_TYPE_P (type
)
6451 && (!init
|| TREE_CODE (init
) == TREE_LIST
))
6453 init
= build_functional_cast (type
, init
, tf_none
);
6454 if (TREE_CODE (init
) == TARGET_EXPR
)
6455 TARGET_EXPR_DIRECT_INIT_P (init
) = true;
6457 init_code
= NULL_TREE
;
6463 if (init
&& TREE_CODE (init
) != TREE_VEC
)
6465 /* In aggregate initialization of a variable, each element
6466 initialization is a full-expression because there is no
6467 enclosing expression. */
6468 gcc_assert (stmts_are_full_exprs_p ());
6470 init_code
= store_init_value (decl
, init
, cleanups
, flags
);
6472 if (pedantic
&& TREE_CODE (type
) == ARRAY_TYPE
6473 && DECL_INITIAL (decl
)
6474 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
6475 && PAREN_STRING_LITERAL_P (DECL_INITIAL (decl
)))
6476 warning_at (cp_expr_loc_or_loc (DECL_INITIAL (decl
),
6477 DECL_SOURCE_LOCATION (decl
)),
6478 0, "array %qD initialized by parenthesized "
6479 "string literal %qE",
6480 decl
, DECL_INITIAL (decl
));
6486 if (CLASS_TYPE_P (core_type
= strip_array_types (type
))
6487 && (CLASSTYPE_READONLY_FIELDS_NEED_INIT (core_type
)
6488 || CLASSTYPE_REF_FIELDS_NEED_INIT (core_type
)))
6489 diagnose_uninitialized_cst_or_ref_member (core_type
, /*using_new=*/false,
6492 check_for_uninitialized_const_var (decl
, /*constexpr_context_p=*/false,
6493 tf_warning_or_error
);
6496 if (init
&& init
!= error_mark_node
)
6497 init_code
= build2 (INIT_EXPR
, type
, decl
, init
);
6501 /* We might have set these in cp_finish_decl. */
6502 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl
) = false;
6503 TREE_CONSTANT (decl
) = false;
6507 && (DECL_IN_AGGR_P (decl
)
6508 && DECL_INITIALIZED_IN_CLASS_P (decl
)
6509 && !DECL_VAR_DECLARED_INLINE_P (decl
)))
6511 static int explained
= 0;
6513 if (cxx_dialect
< cxx11
)
6514 error ("initializer invalid for static member with constructor");
6515 else if (cxx_dialect
< cxx17
)
6516 error ("non-constant in-class initialization invalid for static "
6517 "member %qD", decl
);
6519 error ("non-constant in-class initialization invalid for non-inline "
6520 "static member %qD", decl
);
6523 inform (input_location
,
6524 "(an out of class initialization is required)");
6533 /* If DECL is not a local variable, give it RTL. */
6536 make_rtl_for_nonlocal_decl (tree decl
, tree init
, const char* asmspec
)
6538 int toplev
= toplevel_bindings_p ();
6541 /* Set the DECL_ASSEMBLER_NAME for the object. */
6544 /* The `register' keyword, when used together with an
6545 asm-specification, indicates that the variable should be
6546 placed in a particular register. */
6547 if (VAR_P (decl
) && DECL_REGISTER (decl
))
6549 set_user_assembler_name (decl
, asmspec
);
6550 DECL_HARD_REGISTER (decl
) = 1;
6554 if (TREE_CODE (decl
) == FUNCTION_DECL
6555 && DECL_BUILT_IN_CLASS (decl
) == BUILT_IN_NORMAL
)
6556 set_builtin_user_assembler_name (decl
, asmspec
);
6557 set_user_assembler_name (decl
, asmspec
);
6561 /* Handle non-variables up front. */
6564 rest_of_decl_compilation (decl
, toplev
, at_eof
);
6568 /* If we see a class member here, it should be a static data
6570 if (DECL_LANG_SPECIFIC (decl
) && DECL_IN_AGGR_P (decl
))
6572 gcc_assert (TREE_STATIC (decl
));
6573 /* An in-class declaration of a static data member should be
6574 external; it is only a declaration, and not a definition. */
6575 if (init
== NULL_TREE
)
6576 gcc_assert (DECL_EXTERNAL (decl
)
6577 || !TREE_PUBLIC (decl
)
6578 || DECL_INLINE_VAR_P (decl
));
6581 /* We don't create any RTL for local variables. */
6582 if (DECL_FUNCTION_SCOPE_P (decl
) && !TREE_STATIC (decl
))
6585 /* We defer emission of local statics until the corresponding
6586 DECL_EXPR is expanded. But with constexpr its function might never
6587 be expanded, so go ahead and tell cgraph about the variable now. */
6588 defer_p
= ((DECL_FUNCTION_SCOPE_P (decl
)
6589 && !var_in_maybe_constexpr_fn (decl
))
6590 || DECL_VIRTUAL_P (decl
));
6592 /* Defer template instantiations. */
6593 if (DECL_LANG_SPECIFIC (decl
)
6594 && DECL_IMPLICIT_INSTANTIATION (decl
))
6597 /* If we're not deferring, go ahead and assemble the variable. */
6599 rest_of_decl_compilation (decl
, toplev
, at_eof
);
6602 /* walk_tree helper for wrap_temporary_cleanups, below. */
6605 wrap_cleanups_r (tree
*stmt_p
, int *walk_subtrees
, void *data
)
6607 /* Stop at types or full-expression boundaries. */
6608 if (TYPE_P (*stmt_p
)
6609 || TREE_CODE (*stmt_p
) == CLEANUP_POINT_EXPR
)
6615 if (TREE_CODE (*stmt_p
) == TARGET_EXPR
)
6617 tree guard
= (tree
)data
;
6618 tree tcleanup
= TARGET_EXPR_CLEANUP (*stmt_p
);
6620 tcleanup
= build2 (TRY_CATCH_EXPR
, void_type_node
, tcleanup
, guard
);
6621 /* Tell honor_protect_cleanup_actions to handle this as a separate
6623 TRY_CATCH_IS_CLEANUP (tcleanup
) = 1;
6625 TARGET_EXPR_CLEANUP (*stmt_p
) = tcleanup
;
6631 /* We're initializing a local variable which has a cleanup GUARD. If there
6632 are any temporaries used in the initializer INIT of this variable, we
6633 need to wrap their cleanups with TRY_CATCH_EXPR (, GUARD) so that the
6634 variable will be cleaned up properly if one of them throws.
6636 Unfortunately, there's no way to express this properly in terms of
6637 nesting, as the regions for the temporaries overlap the region for the
6638 variable itself; if there are two temporaries, the variable needs to be
6639 the first thing destroyed if either of them throws. However, we only
6640 want to run the variable's cleanup if it actually got constructed. So
6641 we need to guard the temporary cleanups with the variable's cleanup if
6642 they are run on the normal path, but not if they are run on the
6643 exceptional path. We implement this by telling
6644 honor_protect_cleanup_actions to strip the variable cleanup from the
6645 exceptional path. */
6648 wrap_temporary_cleanups (tree init
, tree guard
)
6650 cp_walk_tree_without_duplicates (&init
, wrap_cleanups_r
, (void *)guard
);
6653 /* Generate code to initialize DECL (a local variable). */
6656 initialize_local_var (tree decl
, tree init
)
6658 tree type
= TREE_TYPE (decl
);
6662 gcc_assert (VAR_P (decl
)
6663 || TREE_CODE (decl
) == RESULT_DECL
);
6664 gcc_assert (!TREE_STATIC (decl
));
6666 if (DECL_SIZE (decl
) == NULL_TREE
)
6668 /* If we used it already as memory, it must stay in memory. */
6669 DECL_INITIAL (decl
) = NULL_TREE
;
6670 TREE_ADDRESSABLE (decl
) = TREE_USED (decl
);
6674 if (type
== error_mark_node
)
6677 /* Compute and store the initial value. */
6678 already_used
= TREE_USED (decl
) || TREE_USED (type
);
6679 if (TREE_USED (type
))
6680 DECL_READ_P (decl
) = 1;
6682 /* Generate a cleanup, if necessary. */
6683 cleanup
= cxx_maybe_build_cleanup (decl
, tf_warning_or_error
);
6685 /* Perform the initialization. */
6688 tree rinit
= (TREE_CODE (init
) == INIT_EXPR
6689 ? TREE_OPERAND (init
, 1) : NULL_TREE
);
6690 if (rinit
&& !TREE_SIDE_EFFECTS (rinit
))
6692 /* Stick simple initializers in DECL_INITIAL so that
6693 -Wno-init-self works (c++/34772). */
6694 gcc_assert (TREE_OPERAND (init
, 0) == decl
);
6695 DECL_INITIAL (decl
) = rinit
;
6697 if (warn_init_self
&& TYPE_REF_P (type
))
6701 warning_at (DECL_SOURCE_LOCATION (decl
),
6703 "reference %qD is initialized with itself", decl
);
6708 int saved_stmts_are_full_exprs_p
;
6710 /* If we're only initializing a single object, guard the
6711 destructors of any temporaries used in its initializer with
6712 its destructor. This isn't right for arrays because each
6713 element initialization is a full-expression. */
6714 if (cleanup
&& TREE_CODE (type
) != ARRAY_TYPE
)
6715 wrap_temporary_cleanups (init
, cleanup
);
6717 gcc_assert (building_stmt_list_p ());
6718 saved_stmts_are_full_exprs_p
= stmts_are_full_exprs_p ();
6719 current_stmt_tree ()->stmts_are_full_exprs_p
= 1;
6720 finish_expr_stmt (init
);
6721 current_stmt_tree ()->stmts_are_full_exprs_p
=
6722 saved_stmts_are_full_exprs_p
;
6726 /* Set this to 0 so we can tell whether an aggregate which was
6727 initialized was ever used. Don't do this if it has a
6728 destructor, so we don't complain about the 'resource
6729 allocation is initialization' idiom. Now set
6730 attribute((unused)) on types so decls of that type will be
6731 marked used. (see TREE_USED, above.) */
6732 if (TYPE_NEEDS_CONSTRUCTING (type
)
6734 && TYPE_HAS_TRIVIAL_DESTRUCTOR (type
)
6735 && DECL_NAME (decl
))
6736 TREE_USED (decl
) = 0;
6737 else if (already_used
)
6738 TREE_USED (decl
) = 1;
6741 finish_decl_cleanup (decl
, cleanup
);
6744 /* DECL is a VAR_DECL for a compiler-generated variable with static
6745 storage duration (like a virtual table) whose initializer is a
6746 compile-time constant. Initialize the variable and provide it to the
6750 initialize_artificial_var (tree decl
, vec
<constructor_elt
, va_gc
> *v
)
6753 gcc_assert (DECL_ARTIFICIAL (decl
));
6754 init
= build_constructor (TREE_TYPE (decl
), v
);
6755 gcc_assert (TREE_CODE (init
) == CONSTRUCTOR
);
6756 DECL_INITIAL (decl
) = init
;
6757 DECL_INITIALIZED_P (decl
) = 1;
6758 determine_visibility (decl
);
6759 layout_var_decl (decl
);
6760 maybe_commonize_var (decl
);
6761 make_rtl_for_nonlocal_decl (decl
, init
, /*asmspec=*/NULL
);
6764 /* INIT is the initializer for a variable, as represented by the
6765 parser. Returns true iff INIT is value-dependent. */
6768 value_dependent_init_p (tree init
)
6770 if (TREE_CODE (init
) == TREE_LIST
)
6771 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
6772 return any_value_dependent_elements_p (init
);
6773 else if (TREE_CODE (init
) == CONSTRUCTOR
)
6774 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
6776 if (dependent_type_p (TREE_TYPE (init
)))
6779 vec
<constructor_elt
, va_gc
> *elts
;
6783 elts
= CONSTRUCTOR_ELTS (init
);
6784 nelts
= vec_safe_length (elts
);
6785 for (i
= 0; i
< nelts
; ++i
)
6786 if (value_dependent_init_p ((*elts
)[i
].value
))
6790 /* It must be a simple expression, e.g., int i = 3; */
6791 return value_dependent_expression_p (init
);
6796 // Returns true if a DECL is VAR_DECL with the concept specifier.
6798 is_concept_var (tree decl
)
6800 return (VAR_P (decl
)
6801 // Not all variables have DECL_LANG_SPECIFIC.
6802 && DECL_LANG_SPECIFIC (decl
)
6803 && DECL_DECLARED_CONCEPT_P (decl
));
6806 /* A helper function to be called via walk_tree. If any label exists
6807 under *TP, it is (going to be) forced. Set has_forced_label_in_static. */
6810 notice_forced_label_r (tree
*tp
, int *walk_subtrees
, void *)
6814 if (TREE_CODE (*tp
) == LABEL_DECL
)
6815 cfun
->has_forced_label_in_static
= 1;
6819 /* Finish processing of a declaration;
6820 install its line number and initial value.
6821 If the length of an array type is not known before,
6822 it must be determined now, from the initial value, or it is an error.
6824 INIT is the initializer (if any) for DECL. If INIT_CONST_EXPR_P is
6825 true, then INIT is an integral constant expression.
6827 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
6828 if the (init) syntax was used. */
6831 cp_finish_decl (tree decl
, tree init
, bool init_const_expr_p
,
6832 tree asmspec_tree
, int flags
)
6835 vec
<tree
, va_gc
> *cleanups
= NULL
;
6836 const char *asmspec
= NULL
;
6837 int was_readonly
= 0;
6838 bool var_definition_p
= false;
6841 if (decl
== error_mark_node
)
6846 error ("assignment (not initialization) in declaration");
6850 gcc_assert (TREE_CODE (decl
) != RESULT_DECL
);
6851 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
6852 gcc_assert (TREE_CODE (decl
) != PARM_DECL
);
6854 type
= TREE_TYPE (decl
);
6855 if (type
== error_mark_node
)
6858 /* Warn about register storage specifiers except when in GNU global
6859 or local register variable extension. */
6860 if (VAR_P (decl
) && DECL_REGISTER (decl
) && asmspec_tree
== NULL_TREE
)
6862 if (cxx_dialect
>= cxx17
)
6863 pedwarn (DECL_SOURCE_LOCATION (decl
), OPT_Wregister
,
6864 "ISO C++17 does not allow %<register%> storage "
6867 warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wregister
,
6868 "%<register%> storage class specifier used");
6871 /* If a name was specified, get the string. */
6872 if (at_namespace_scope_p ())
6873 asmspec_tree
= maybe_apply_renaming_pragma (decl
, asmspec_tree
);
6874 if (asmspec_tree
&& asmspec_tree
!= error_mark_node
)
6875 asmspec
= TREE_STRING_POINTER (asmspec_tree
);
6877 if (current_class_type
6878 && CP_DECL_CONTEXT (decl
) == current_class_type
6879 && TYPE_BEING_DEFINED (current_class_type
)
6880 && !CLASSTYPE_TEMPLATE_INSTANTIATION (current_class_type
)
6881 && (DECL_INITIAL (decl
) || init
))
6882 DECL_INITIALIZED_IN_CLASS_P (decl
) = 1;
6884 /* Do auto deduction unless decl is a function or an uninstantiated
6885 template specialization. */
6886 if (TREE_CODE (decl
) != FUNCTION_DECL
6887 && !(init
== NULL_TREE
6888 && DECL_LANG_SPECIFIC (decl
)
6889 && DECL_TEMPLATE_INSTANTIATION (decl
)
6890 && !DECL_TEMPLATE_INSTANTIATED (decl
))
6891 && (auto_node
= type_uses_auto (type
)))
6894 if (init
== NULL_TREE
)
6895 gcc_assert (CLASS_PLACEHOLDER_TEMPLATE (auto_node
));
6899 if (TREE_CODE (d_init
) == TREE_LIST
6900 && !CLASS_PLACEHOLDER_TEMPLATE (auto_node
))
6901 d_init
= build_x_compound_expr_from_list (d_init
, ELK_INIT
,
6902 tf_warning_or_error
);
6903 d_init
= resolve_nondeduced_context (d_init
, tf_warning_or_error
);
6905 enum auto_deduction_context adc
= adc_variable_type
;
6906 if (VAR_P (decl
) && DECL_DECOMPOSITION_P (decl
))
6907 adc
= adc_decomp_type
;
6908 type
= TREE_TYPE (decl
) = do_auto_deduction (type
, d_init
, auto_node
,
6909 tf_warning_or_error
, adc
,
6911 if (type
== error_mark_node
)
6913 if (TREE_CODE (type
) == FUNCTION_TYPE
)
6915 error ("initializer for %<decltype(auto) %D%> has function type "
6916 "(did you forget the %<()%> ?)", decl
);
6917 TREE_TYPE (decl
) = error_mark_node
;
6920 cp_apply_type_quals_to_decl (cp_type_quals (type
), decl
);
6923 if (ensure_literal_type_for_constexpr_object (decl
) == error_mark_node
)
6925 DECL_DECLARED_CONSTEXPR_P (decl
) = 0;
6926 if (VAR_P (decl
) && DECL_CLASS_SCOPE_P (decl
))
6929 DECL_EXTERNAL (decl
) = 1;
6934 && DECL_CLASS_SCOPE_P (decl
)
6935 && DECL_INITIALIZED_IN_CLASS_P (decl
))
6936 check_static_variable_definition (decl
, type
);
6938 if (init
&& TREE_CODE (decl
) == FUNCTION_DECL
)
6941 if (init
== ridpointers
[(int)RID_DELETE
])
6943 /* FIXME check this is 1st decl. */
6944 DECL_DELETED_FN (decl
) = 1;
6945 DECL_DECLARED_INLINE_P (decl
) = 1;
6946 DECL_INITIAL (decl
) = error_mark_node
;
6947 FOR_EACH_CLONE (clone
, decl
)
6949 DECL_DELETED_FN (clone
) = 1;
6950 DECL_DECLARED_INLINE_P (clone
) = 1;
6951 DECL_INITIAL (clone
) = error_mark_node
;
6955 else if (init
== ridpointers
[(int)RID_DEFAULT
])
6957 if (defaultable_fn_check (decl
))
6958 DECL_DEFAULTED_FN (decl
) = 1;
6960 DECL_INITIAL (decl
) = NULL_TREE
;
6964 if (init
&& VAR_P (decl
))
6966 DECL_NONTRIVIALLY_INITIALIZED_P (decl
) = 1;
6967 /* If DECL is a reference, then we want to know whether init is a
6968 reference constant; init_const_expr_p as passed tells us whether
6969 it's an rvalue constant. */
6970 if (TYPE_REF_P (type
))
6971 init_const_expr_p
= potential_constant_expression (init
);
6972 if (init_const_expr_p
)
6974 /* Set these flags now for templates. We'll update the flags in
6975 store_init_value for instantiations. */
6976 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl
) = 1;
6977 if (decl_maybe_constant_var_p (decl
)
6978 /* FIXME setting TREE_CONSTANT on refs breaks the back end. */
6979 && !TYPE_REF_P (type
))
6980 TREE_CONSTANT (decl
) = 1;
6984 if (processing_template_decl
)
6986 bool type_dependent_p
;
6988 /* Add this declaration to the statement-tree. */
6989 if (at_function_scope_p ())
6990 add_decl_expr (decl
);
6992 type_dependent_p
= dependent_type_p (type
);
6994 if (check_for_bare_parameter_packs (init
))
6997 DECL_INITIAL (decl
) = NULL_TREE
;
7000 /* Generally, initializers in templates are expanded when the
7001 template is instantiated. But, if DECL is a variable constant
7002 then it can be used in future constant expressions, so its value
7003 must be available. */
7005 bool dep_init
= false;
7007 if (!VAR_P (decl
) || type_dependent_p
)
7008 /* We can't do anything if the decl has dependent type. */;
7009 else if (!init
&& is_concept_var (decl
))
7011 error ("variable concept has no initializer");
7012 init
= boolean_true_node
;
7015 && init_const_expr_p
7016 && !TYPE_REF_P (type
)
7017 && decl_maybe_constant_var_p (decl
)
7018 && !(dep_init
= value_dependent_init_p (init
)))
7020 /* This variable seems to be a non-dependent constant, so process
7021 its initializer. If check_initializer returns non-null the
7022 initialization wasn't constant after all. */
7024 cleanups
= make_tree_vector ();
7025 init_code
= check_initializer (decl
, init
, flags
, &cleanups
);
7026 if (init_code
== NULL_TREE
)
7028 release_tree_vector (cleanups
);
7030 else if (!DECL_PRETTY_FUNCTION_P (decl
))
7032 /* Deduce array size even if the initializer is dependent. */
7033 maybe_deduce_size_from_array_init (decl
, init
);
7034 /* And complain about multiple initializers. */
7035 if (init
&& TREE_CODE (init
) == TREE_LIST
&& TREE_CHAIN (init
)
7036 && !MAYBE_CLASS_TYPE_P (type
))
7037 init
= build_x_compound_expr_from_list (init
, ELK_INIT
,
7038 tf_warning_or_error
);
7042 DECL_INITIAL (decl
) = init
;
7046 retrofit_lang_decl (decl
);
7047 SET_DECL_DEPENDENT_INIT_P (decl
, true);
7052 /* Just store non-static data member initializers for later. */
7053 if (init
&& TREE_CODE (decl
) == FIELD_DECL
)
7054 DECL_INITIAL (decl
) = init
;
7056 /* Take care of TYPE_DECLs up front. */
7057 if (TREE_CODE (decl
) == TYPE_DECL
)
7059 if (type
!= error_mark_node
7060 && MAYBE_CLASS_TYPE_P (type
) && DECL_NAME (decl
))
7062 if (TREE_TYPE (DECL_NAME (decl
)) && TREE_TYPE (decl
) != type
)
7063 warning (0, "shadowing previous type declaration of %q#D", decl
);
7064 set_identifier_type_value (DECL_NAME (decl
), decl
);
7067 /* If we have installed this as the canonical typedef for this
7068 type, and that type has not been defined yet, delay emitting
7069 the debug information for it, as we will emit it later. */
7070 if (TYPE_MAIN_DECL (TREE_TYPE (decl
)) == decl
7071 && !COMPLETE_TYPE_P (TREE_TYPE (decl
)))
7072 TYPE_DECL_SUPPRESS_DEBUG (decl
) = 1;
7074 rest_of_decl_compilation (decl
, DECL_FILE_SCOPE_P (decl
),
7079 /* A reference will be modified here, as it is initialized. */
7080 if (! DECL_EXTERNAL (decl
)
7081 && TREE_READONLY (decl
)
7082 && TYPE_REF_P (type
))
7085 TREE_READONLY (decl
) = 0;
7090 /* If this is a local variable that will need a mangled name,
7091 register it now. We must do this before processing the
7092 initializer for the variable, since the initialization might
7093 require a guard variable, and since the mangled name of the
7094 guard variable will depend on the mangled name of this
7096 if (DECL_FUNCTION_SCOPE_P (decl
)
7097 && TREE_STATIC (decl
)
7098 && !DECL_ARTIFICIAL (decl
))
7100 push_local_name (decl
);
7101 /* Normally has_forced_label_in_static is set during GIMPLE
7102 lowering, but [cd]tors are never actually compiled directly.
7103 We need to set this early so we can deal with the label
7104 address extension. */
7105 if ((DECL_CONSTRUCTOR_P (current_function_decl
)
7106 || DECL_DESTRUCTOR_P (current_function_decl
))
7109 walk_tree (&init
, notice_forced_label_r
, NULL
, NULL
);
7110 add_local_decl (cfun
, decl
);
7112 /* And make sure it's in the symbol table for
7113 c_parse_final_cleanups to find. */
7114 varpool_node::get_create (decl
);
7117 /* Convert the initializer to the type of DECL, if we have not
7118 already initialized DECL. */
7119 if (!DECL_INITIALIZED_P (decl
)
7120 /* If !DECL_EXTERNAL then DECL is being defined. In the
7121 case of a static data member initialized inside the
7122 class-specifier, there can be an initializer even if DECL
7123 is *not* defined. */
7124 && (!DECL_EXTERNAL (decl
) || init
))
7126 cleanups
= make_tree_vector ();
7127 init
= check_initializer (decl
, init
, flags
, &cleanups
);
7133 The memory occupied by any object of static storage
7134 duration is zero-initialized at program startup before
7135 any other initialization takes place.
7137 We cannot create an appropriate initializer until after
7138 the type of DECL is finalized. If DECL_INITIAL is set,
7139 then the DECL is statically initialized, and any
7140 necessary zero-initialization has already been performed. */
7141 if (TREE_STATIC (decl
) && !DECL_INITIAL (decl
))
7142 DECL_INITIAL (decl
) = build_zero_init (TREE_TYPE (decl
),
7143 /*nelts=*/NULL_TREE
,
7144 /*static_storage_p=*/true);
7145 /* Remember that the initialization for this variable has
7147 DECL_INITIALIZED_P (decl
) = 1;
7148 /* This declaration is the definition of this variable,
7149 unless we are initializing a static data member within
7150 the class specifier. */
7151 if (!DECL_EXTERNAL (decl
))
7152 var_definition_p
= true;
7154 /* If the variable has an array type, lay out the type, even if
7155 there is no initializer. It is valid to index through the
7156 array, and we must get TYPE_ALIGN set correctly on the array
7158 else if (TREE_CODE (type
) == ARRAY_TYPE
)
7161 if (TREE_STATIC (decl
)
7162 && !at_function_scope_p ()
7163 && current_function_decl
== NULL
)
7164 /* So decl is a global variable or a static member of a
7165 non local class. Record the types it uses
7166 so that we can decide later to emit debug info for them. */
7167 record_types_used_by_current_var_decl (decl
);
7170 /* Add this declaration to the statement-tree. This needs to happen
7171 after the call to check_initializer so that the DECL_EXPR for a
7172 reference temp is added before the DECL_EXPR for the reference itself. */
7173 if (DECL_FUNCTION_SCOPE_P (decl
))
7175 /* If we're building a variable sized type, and we might be
7176 reachable other than via the top of the current binding
7177 level, then create a new BIND_EXPR so that we deallocate
7178 the object at the right time. */
7181 && !TREE_CONSTANT (DECL_SIZE (decl
))
7182 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list
))
7185 bind
= build3 (BIND_EXPR
, void_type_node
, NULL
, NULL
, NULL
);
7186 TREE_SIDE_EFFECTS (bind
) = 1;
7188 BIND_EXPR_BODY (bind
) = push_stmt_list ();
7190 add_decl_expr (decl
);
7193 /* Let the middle end know about variables and functions -- but not
7194 static data members in uninstantiated class templates. */
7195 if (VAR_OR_FUNCTION_DECL_P (decl
))
7199 layout_var_decl (decl
);
7200 maybe_commonize_var (decl
);
7203 /* This needs to happen after the linkage is set. */
7204 determine_visibility (decl
);
7206 if (var_definition_p
&& TREE_STATIC (decl
))
7208 /* If a TREE_READONLY variable needs initialization
7209 at runtime, it is no longer readonly and we need to
7210 avoid MEM_READONLY_P being set on RTL created for it. */
7213 if (TREE_READONLY (decl
))
7214 TREE_READONLY (decl
) = 0;
7217 else if (was_readonly
)
7218 TREE_READONLY (decl
) = 1;
7220 /* Likewise if it needs destruction. */
7221 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type
))
7222 TREE_READONLY (decl
) = 0;
7225 make_rtl_for_nonlocal_decl (decl
, init
, asmspec
);
7227 /* Check for abstractness of the type. Notice that there is no
7228 need to strip array types here since the check for those types
7229 is already done within create_array_type_for_decl. */
7230 abstract_virtuals_error (decl
, type
);
7232 if (TREE_TYPE (decl
) == error_mark_node
)
7233 /* No initialization required. */
7235 else if (TREE_CODE (decl
) == FUNCTION_DECL
)
7239 if (init
== ridpointers
[(int)RID_DEFAULT
])
7241 /* An out-of-class default definition is defined at
7242 the point where it is explicitly defaulted. */
7243 if (DECL_DELETED_FN (decl
))
7244 maybe_explain_implicit_delete (decl
);
7245 else if (DECL_INITIAL (decl
) == error_mark_node
)
7246 synthesize_method (decl
);
7249 error ("function %q#D is initialized like a variable", decl
);
7251 /* else no initialization required. */
7253 else if (DECL_EXTERNAL (decl
)
7254 && ! (DECL_LANG_SPECIFIC (decl
)
7255 && DECL_NOT_REALLY_EXTERN (decl
)))
7258 DECL_INITIAL (decl
) = init
;
7260 /* A variable definition. */
7261 else if (DECL_FUNCTION_SCOPE_P (decl
) && !TREE_STATIC (decl
))
7262 /* Initialize the local variable. */
7263 initialize_local_var (decl
, init
);
7265 /* If a variable is defined, and then a subsequent
7266 definition with external linkage is encountered, we will
7267 get here twice for the same variable. We want to avoid
7268 calling expand_static_init more than once. For variables
7269 that are not static data members, we can call
7270 expand_static_init only when we actually process the
7271 initializer. It is not legal to redeclare a static data
7272 member, so this issue does not arise in that case. */
7273 else if (var_definition_p
&& TREE_STATIC (decl
))
7274 expand_static_init (decl
, init
);
7277 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
7278 reference, insert it in the statement-tree now. */
7282 FOR_EACH_VEC_ELT (*cleanups
, i
, t
)
7283 push_cleanup (decl
, t
, false);
7284 release_tree_vector (cleanups
);
7288 TREE_READONLY (decl
) = 1;
7292 && lookup_attribute ("omp declare target implicit",
7293 DECL_ATTRIBUTES (decl
)))
7295 DECL_ATTRIBUTES (decl
)
7296 = remove_attribute ("omp declare target implicit",
7297 DECL_ATTRIBUTES (decl
));
7298 complete_type (TREE_TYPE (decl
));
7299 if (!cp_omp_mappable_type (TREE_TYPE (decl
)))
7300 error ("%q+D in declare target directive does not have mappable type",
7302 else if (!lookup_attribute ("omp declare target",
7303 DECL_ATTRIBUTES (decl
))
7304 && !lookup_attribute ("omp declare target link",
7305 DECL_ATTRIBUTES (decl
)))
7306 DECL_ATTRIBUTES (decl
)
7307 = tree_cons (get_identifier ("omp declare target"),
7308 NULL_TREE
, DECL_ATTRIBUTES (decl
));
7311 invoke_plugin_callbacks (PLUGIN_FINISH_DECL
, decl
);
7314 /* For class TYPE return itself or some its bases that contain
7315 any direct non-static data members. Return error_mark_node if an
7316 error has been diagnosed. */
7319 find_decomp_class_base (location_t loc
, tree type
, tree ret
)
7321 bool member_seen
= false;
7322 for (tree field
= TYPE_FIELDS (type
); field
; field
= DECL_CHAIN (field
))
7323 if (TREE_CODE (field
) != FIELD_DECL
7324 || DECL_ARTIFICIAL (field
)
7325 || DECL_UNNAMED_BIT_FIELD (field
))
7329 else if (ANON_AGGR_TYPE_P (TREE_TYPE (field
)))
7331 if (TREE_CODE (TREE_TYPE (field
)) == RECORD_TYPE
)
7332 error_at (loc
, "cannot decompose class type %qT because it has an "
7333 "anonymous struct member", type
);
7335 error_at (loc
, "cannot decompose class type %qT because it has an "
7336 "anonymous union member", type
);
7337 inform (DECL_SOURCE_LOCATION (field
), "declared here");
7338 return error_mark_node
;
7340 else if (!accessible_p (type
, field
, true))
7342 error_at (loc
, "cannot decompose inaccessible member %qD of %qT",
7344 inform (DECL_SOURCE_LOCATION (field
),
7345 TREE_PRIVATE (field
)
7346 ? G_("declared private here")
7347 : G_("declared protected here"));
7348 return error_mark_node
;
7353 tree base_binfo
, binfo
;
7354 tree orig_ret
= ret
;
7358 for (binfo
= TYPE_BINFO (type
), i
= 0;
7359 BINFO_BASE_ITERATE (binfo
, i
, base_binfo
); i
++)
7361 tree t
= find_decomp_class_base (loc
, TREE_TYPE (base_binfo
), ret
);
7362 if (t
== error_mark_node
)
7363 return error_mark_node
;
7364 if (t
!= NULL_TREE
&& t
!= ret
)
7368 error_at (loc
, "cannot decompose class type %qT: both it and "
7369 "its base class %qT have non-static data members",
7371 return error_mark_node
;
7373 else if (orig_ret
!= NULL_TREE
)
7375 else if (ret
!= NULL_TREE
)
7377 error_at (loc
, "cannot decompose class type %qT: its base "
7378 "classes %qT and %qT have non-static data "
7379 "members", type
, ret
, t
);
7380 return error_mark_node
;
7389 /* Return std::tuple_size<TYPE>::value. */
7392 get_tuple_size (tree type
)
7394 tree args
= make_tree_vec (1);
7395 TREE_VEC_ELT (args
, 0) = type
;
7396 tree inst
= lookup_template_class (tuple_size_identifier
, args
,
7397 /*in_decl*/NULL_TREE
,
7398 /*context*/std_node
,
7399 /*entering_scope*/false, tf_none
);
7400 inst
= complete_type (inst
);
7401 if (inst
== error_mark_node
|| !COMPLETE_TYPE_P (inst
))
7403 tree val
= lookup_qualified_name (inst
, value_identifier
,
7404 /*type*/false, /*complain*/false);
7405 if (TREE_CODE (val
) == VAR_DECL
|| TREE_CODE (val
) == CONST_DECL
)
7406 val
= maybe_constant_value (val
);
7407 if (TREE_CODE (val
) == INTEGER_CST
)
7410 return error_mark_node
;
7413 /* Return std::tuple_element<I,TYPE>::type. */
7416 get_tuple_element_type (tree type
, unsigned i
)
7418 tree args
= make_tree_vec (2);
7419 TREE_VEC_ELT (args
, 0) = build_int_cst (integer_type_node
, i
);
7420 TREE_VEC_ELT (args
, 1) = type
;
7421 tree inst
= lookup_template_class (tuple_element_identifier
, args
,
7422 /*in_decl*/NULL_TREE
,
7423 /*context*/std_node
,
7424 /*entering_scope*/false,
7425 tf_warning_or_error
);
7426 return make_typename_type (inst
, type_identifier
,
7427 none_type
, tf_warning_or_error
);
7430 /* Return e.get<i>() or get<i>(e). */
7433 get_tuple_decomp_init (tree decl
, unsigned i
)
7435 tree targs
= make_tree_vec (1);
7436 TREE_VEC_ELT (targs
, 0) = build_int_cst (integer_type_node
, i
);
7438 tree etype
= TREE_TYPE (decl
);
7439 tree e
= convert_from_reference (decl
);
7441 /* [The id-expression] e is an lvalue if the type of the entity e is an
7442 lvalue reference and an xvalue otherwise. */
7443 if (!TYPE_REF_P (etype
)
7444 || TYPE_REF_IS_RVALUE (etype
))
7447 tree fns
= lookup_qualified_name (TREE_TYPE (e
), get__identifier
,
7448 /*type*/false, /*complain*/false);
7449 bool use_member_get
= false;
7451 /* To use a member get, member lookup must find at least one
7452 declaration that is a function template
7453 whose first template parameter is a non-type parameter. */
7454 for (lkp_iterator
iter (MAYBE_BASELINK_FUNCTIONS (fns
)); iter
; ++iter
)
7457 if (TREE_CODE (fn
) == TEMPLATE_DECL
)
7459 tree tparms
= DECL_TEMPLATE_PARMS (fn
);
7460 tree parm
= TREE_VEC_ELT (INNERMOST_TEMPLATE_PARMS (tparms
), 0);
7461 if (TREE_CODE (TREE_VALUE (parm
)) == PARM_DECL
)
7463 use_member_get
= true;
7471 fns
= lookup_template_function (fns
, targs
);
7472 return build_new_method_call (e
, fns
, /*args*/NULL
,
7473 /*path*/NULL_TREE
, LOOKUP_NORMAL
,
7474 /*fn_p*/NULL
, tf_warning_or_error
);
7478 vec
<tree
,va_gc
> *args
= make_tree_vector_single (e
);
7479 fns
= lookup_template_function (get__identifier
, targs
);
7480 fns
= perform_koenig_lookup (fns
, args
, tf_warning_or_error
);
7481 return finish_call_expr (fns
, &args
, /*novirt*/false,
7482 /*koenig*/true, tf_warning_or_error
);
7486 /* It's impossible to recover the decltype of a tuple decomposition variable
7487 based on the actual type of the variable, so store it in a hash table. */
7489 static GTY((cache
)) tree_cache_map
*decomp_type_table
;
7491 store_decomp_type (tree v
, tree t
)
7493 if (!decomp_type_table
)
7494 decomp_type_table
= tree_cache_map::create_ggc (13);
7495 decomp_type_table
->put (v
, t
);
7499 lookup_decomp_type (tree v
)
7501 return *decomp_type_table
->get (v
);
7504 /* Mangle a decomposition declaration if needed. Arguments like
7505 in cp_finish_decomp. */
7508 cp_maybe_mangle_decomp (tree decl
, tree first
, unsigned int count
)
7510 if (!processing_template_decl
7511 && !error_operand_p (decl
)
7512 && DECL_NAMESPACE_SCOPE_P (decl
))
7514 auto_vec
<tree
, 16> v
;
7515 v
.safe_grow (count
);
7517 for (unsigned int i
= 0; i
< count
; i
++, d
= DECL_CHAIN (d
))
7518 v
[count
- i
- 1] = d
;
7519 SET_DECL_ASSEMBLER_NAME (decl
, mangle_decomp (decl
, v
));
7520 maybe_apply_pragma_weak (decl
);
7524 /* Finish a decomposition declaration. DECL is the underlying declaration
7525 "e", FIRST is the head of a chain of decls for the individual identifiers
7526 chained through DECL_CHAIN in reverse order and COUNT is the number of
7530 cp_finish_decomp (tree decl
, tree first
, unsigned int count
)
7532 if (error_operand_p (decl
))
7537 TREE_TYPE (first
) = error_mark_node
;
7538 if (DECL_HAS_VALUE_EXPR_P (first
))
7540 SET_DECL_VALUE_EXPR (first
, NULL_TREE
);
7541 DECL_HAS_VALUE_EXPR_P (first
) = 0;
7543 first
= DECL_CHAIN (first
);
7545 if (DECL_P (decl
) && DECL_NAMESPACE_SCOPE_P (decl
))
7546 SET_DECL_ASSEMBLER_NAME (decl
, get_identifier ("<decomp>"));
7550 location_t loc
= DECL_SOURCE_LOCATION (decl
);
7551 if (type_dependent_expression_p (decl
)
7552 /* This happens for range for when not in templates.
7553 Still add the DECL_VALUE_EXPRs for later processing. */
7554 || (!processing_template_decl
7555 && type_uses_auto (TREE_TYPE (decl
))))
7557 for (unsigned int i
= 0; i
< count
; i
++)
7559 if (!DECL_HAS_VALUE_EXPR_P (first
))
7561 tree v
= build_nt (ARRAY_REF
, decl
,
7562 size_int (count
- i
- 1),
7563 NULL_TREE
, NULL_TREE
);
7564 SET_DECL_VALUE_EXPR (first
, v
);
7565 DECL_HAS_VALUE_EXPR_P (first
) = 1;
7567 if (processing_template_decl
)
7568 fit_decomposition_lang_decl (first
, decl
);
7569 first
= DECL_CHAIN (first
);
7574 auto_vec
<tree
, 16> v
;
7575 v
.safe_grow (count
);
7577 for (unsigned int i
= 0; i
< count
; i
++, d
= DECL_CHAIN (d
))
7579 v
[count
- i
- 1] = d
;
7580 fit_decomposition_lang_decl (d
, decl
);
7583 tree type
= TREE_TYPE (decl
);
7586 if (TYPE_REF_P (type
))
7588 dexp
= convert_from_reference (dexp
);
7589 type
= complete_type (TREE_TYPE (type
));
7590 if (type
== error_mark_node
)
7592 if (!COMPLETE_TYPE_P (type
))
7594 error_at (loc
, "structured binding refers to incomplete type %qT",
7600 tree eltype
= NULL_TREE
;
7601 unsigned HOST_WIDE_INT eltscnt
= 0;
7602 if (TREE_CODE (type
) == ARRAY_TYPE
)
7605 nelts
= array_type_nelts_top (type
);
7606 if (nelts
== error_mark_node
)
7608 if (!tree_fits_uhwi_p (nelts
))
7610 error_at (loc
, "cannot decompose variable length array %qT", type
);
7613 eltscnt
= tree_to_uhwi (nelts
);
7614 if (count
!= eltscnt
)
7617 if (count
> eltscnt
)
7618 error_n (loc
, count
,
7619 "%u name provided for structured binding",
7620 "%u names provided for structured binding", count
);
7622 error_n (loc
, count
,
7623 "only %u name provided for structured binding",
7624 "only %u names provided for structured binding", count
);
7625 inform_n (loc
, eltscnt
,
7626 "while %qT decomposes into %wu element",
7627 "while %qT decomposes into %wu elements",
7631 eltype
= TREE_TYPE (type
);
7632 for (unsigned int i
= 0; i
< count
; i
++)
7634 TREE_TYPE (v
[i
]) = eltype
;
7635 layout_decl (v
[i
], 0);
7636 if (processing_template_decl
)
7638 tree t
= unshare_expr (dexp
);
7639 t
= build4_loc (DECL_SOURCE_LOCATION (v
[i
]), ARRAY_REF
,
7640 eltype
, t
, size_int (i
), NULL_TREE
,
7642 SET_DECL_VALUE_EXPR (v
[i
], t
);
7643 DECL_HAS_VALUE_EXPR_P (v
[i
]) = 1;
7646 /* 2 GNU extensions. */
7647 else if (TREE_CODE (type
) == COMPLEX_TYPE
)
7650 if (count
!= eltscnt
)
7652 eltype
= cp_build_qualified_type (TREE_TYPE (type
), TYPE_QUALS (type
));
7653 for (unsigned int i
= 0; i
< count
; i
++)
7655 TREE_TYPE (v
[i
]) = eltype
;
7656 layout_decl (v
[i
], 0);
7657 if (processing_template_decl
)
7659 tree t
= unshare_expr (dexp
);
7660 t
= build1_loc (DECL_SOURCE_LOCATION (v
[i
]),
7661 i
? IMAGPART_EXPR
: REALPART_EXPR
, eltype
,
7663 SET_DECL_VALUE_EXPR (v
[i
], t
);
7664 DECL_HAS_VALUE_EXPR_P (v
[i
]) = 1;
7667 else if (TREE_CODE (type
) == VECTOR_TYPE
)
7669 if (!TYPE_VECTOR_SUBPARTS (type
).is_constant (&eltscnt
))
7671 error_at (loc
, "cannot decompose variable length vector %qT", type
);
7674 if (count
!= eltscnt
)
7676 eltype
= cp_build_qualified_type (TREE_TYPE (type
), TYPE_QUALS (type
));
7677 for (unsigned int i
= 0; i
< count
; i
++)
7679 TREE_TYPE (v
[i
]) = eltype
;
7680 layout_decl (v
[i
], 0);
7681 if (processing_template_decl
)
7683 tree t
= unshare_expr (dexp
);
7684 convert_vector_to_array_for_subscript (DECL_SOURCE_LOCATION (v
[i
]),
7686 t
= build4_loc (DECL_SOURCE_LOCATION (v
[i
]), ARRAY_REF
,
7687 eltype
, t
, size_int (i
), NULL_TREE
,
7689 SET_DECL_VALUE_EXPR (v
[i
], t
);
7690 DECL_HAS_VALUE_EXPR_P (v
[i
]) = 1;
7693 else if (tree tsize
= get_tuple_size (type
))
7695 if (tsize
== error_mark_node
)
7697 error_at (loc
, "%<std::tuple_size<%T>::value%> is not an integral "
7698 "constant expression", type
);
7701 if (!tree_fits_uhwi_p (tsize
))
7703 error_n (loc
, count
,
7704 "%u name provided for structured binding",
7705 "%u names provided for structured binding", count
);
7706 inform (loc
, "while %qT decomposes into %E elements",
7710 eltscnt
= tree_to_uhwi (tsize
);
7711 if (count
!= eltscnt
)
7713 int save_read
= DECL_READ_P (decl
);
7714 for (unsigned i
= 0; i
< count
; ++i
)
7716 location_t sloc
= input_location
;
7717 location_t dloc
= DECL_SOURCE_LOCATION (v
[i
]);
7719 input_location
= dloc
;
7720 tree init
= get_tuple_decomp_init (decl
, i
);
7721 tree eltype
= (init
== error_mark_node
? error_mark_node
7722 : get_tuple_element_type (type
, i
));
7723 input_location
= sloc
;
7725 if (init
== error_mark_node
|| eltype
== error_mark_node
)
7727 inform (dloc
, "in initialization of structured binding "
7728 "variable %qD", v
[i
]);
7731 /* Save the decltype away before reference collapse. */
7732 store_decomp_type (v
[i
], eltype
);
7733 eltype
= cp_build_reference_type (eltype
, !lvalue_p (init
));
7734 TREE_TYPE (v
[i
]) = eltype
;
7735 layout_decl (v
[i
], 0);
7736 if (DECL_HAS_VALUE_EXPR_P (v
[i
]))
7738 /* In this case the names are variables, not just proxies. */
7739 SET_DECL_VALUE_EXPR (v
[i
], NULL_TREE
);
7740 DECL_HAS_VALUE_EXPR_P (v
[i
]) = 0;
7742 if (!processing_template_decl
)
7743 cp_finish_decl (v
[i
], init
, /*constexpr*/false,
7744 /*asm*/NULL_TREE
, LOOKUP_NORMAL
);
7746 /* Ignore reads from the underlying decl performed during initialization
7747 of the individual variables. If those will be read, we'll mark
7748 the underlying decl as read at that point. */
7749 DECL_READ_P (decl
) = save_read
;
7751 else if (TREE_CODE (type
) == UNION_TYPE
)
7753 error_at (loc
, "cannot decompose union type %qT", type
);
7756 else if (!CLASS_TYPE_P (type
))
7758 error_at (loc
, "cannot decompose non-array non-class type %qT", type
);
7761 else if (LAMBDA_TYPE_P (type
))
7763 error_at (loc
, "cannot decompose lambda closure type %qT", type
);
7766 else if (processing_template_decl
&& !COMPLETE_TYPE_P (type
))
7767 pedwarn (loc
, 0, "structured binding refers to incomplete class type %qT",
7771 tree btype
= find_decomp_class_base (loc
, type
, NULL_TREE
);
7772 if (btype
== error_mark_node
)
7774 else if (btype
== NULL_TREE
)
7776 error_at (loc
, "cannot decompose class type %qT without non-static "
7777 "data members", type
);
7780 for (tree field
= TYPE_FIELDS (btype
); field
; field
= TREE_CHAIN (field
))
7781 if (TREE_CODE (field
) != FIELD_DECL
7782 || DECL_ARTIFICIAL (field
)
7783 || DECL_UNNAMED_BIT_FIELD (field
))
7787 if (count
!= eltscnt
)
7792 t
= convert_to_base (t
, btype
, /*check_access*/true,
7793 /*nonnull*/false, tf_warning_or_error
);
7797 for (tree field
= TYPE_FIELDS (btype
); field
; field
= TREE_CHAIN (field
))
7798 if (TREE_CODE (field
) != FIELD_DECL
7799 || DECL_ARTIFICIAL (field
)
7800 || DECL_UNNAMED_BIT_FIELD (field
))
7804 tree tt
= finish_non_static_data_member (field
, unshare_expr (t
),
7806 if (REFERENCE_REF_P (tt
))
7807 tt
= TREE_OPERAND (tt
, 0);
7808 TREE_TYPE (v
[i
]) = TREE_TYPE (tt
);
7809 layout_decl (v
[i
], 0);
7810 if (!processing_template_decl
)
7812 SET_DECL_VALUE_EXPR (v
[i
], tt
);
7813 DECL_HAS_VALUE_EXPR_P (v
[i
]) = 1;
7818 if (processing_template_decl
)
7820 for (unsigned int i
= 0; i
< count
; i
++)
7821 if (!DECL_HAS_VALUE_EXPR_P (v
[i
]))
7823 tree a
= build_nt (ARRAY_REF
, decl
, size_int (i
),
7824 NULL_TREE
, NULL_TREE
);
7825 SET_DECL_VALUE_EXPR (v
[i
], a
);
7826 DECL_HAS_VALUE_EXPR_P (v
[i
]) = 1;
7831 /* Returns a declaration for a VAR_DECL as if:
7833 extern "C" TYPE NAME;
7835 had been seen. Used to create compiler-generated global
7839 declare_global_var (tree name
, tree type
)
7843 push_to_top_level ();
7844 decl
= build_decl (input_location
, VAR_DECL
, name
, type
);
7845 TREE_PUBLIC (decl
) = 1;
7846 DECL_EXTERNAL (decl
) = 1;
7847 DECL_ARTIFICIAL (decl
) = 1;
7848 DECL_CONTEXT (decl
) = FROB_CONTEXT (global_namespace
);
7849 /* If the user has explicitly declared this variable (perhaps
7850 because the code we are compiling is part of a low-level runtime
7851 library), then it is possible that our declaration will be merged
7852 with theirs by pushdecl. */
7853 decl
= pushdecl (decl
);
7854 cp_finish_decl (decl
, NULL_TREE
, false, NULL_TREE
, 0);
7855 pop_from_top_level ();
7860 /* Returns the type for the argument to "__cxa_atexit" (or "atexit",
7861 if "__cxa_atexit" is not being used) corresponding to the function
7862 to be called when the program exits. */
7865 get_atexit_fn_ptr_type (void)
7869 if (!atexit_fn_ptr_type_node
)
7872 if (flag_use_cxa_atexit
7873 && !targetm
.cxx
.use_atexit_for_cxa_atexit ())
7874 /* The parameter to "__cxa_atexit" is "void (*)(void *)". */
7875 arg_type
= ptr_type_node
;
7877 /* The parameter to "atexit" is "void (*)(void)". */
7878 arg_type
= NULL_TREE
;
7880 fn_type
= build_function_type_list (void_type_node
,
7881 arg_type
, NULL_TREE
);
7882 atexit_fn_ptr_type_node
= build_pointer_type (fn_type
);
7885 return atexit_fn_ptr_type_node
;
7888 /* Returns a pointer to the `atexit' function. Note that if
7889 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
7890 `__cxa_atexit' function specified in the IA64 C++ ABI. */
7893 get_atexit_node (void)
7899 bool use_aeabi_atexit
;
7904 if (flag_use_cxa_atexit
&& !targetm
.cxx
.use_atexit_for_cxa_atexit ())
7906 /* The declaration for `__cxa_atexit' is:
7908 int __cxa_atexit (void (*)(void *), void *, void *)
7910 We build up the argument types and then the function type
7912 tree argtype0
, argtype1
, argtype2
;
7914 use_aeabi_atexit
= targetm
.cxx
.use_aeabi_atexit ();
7915 /* First, build the pointer-to-function type for the first
7917 fn_ptr_type
= get_atexit_fn_ptr_type ();
7918 /* Then, build the rest of the argument types. */
7919 argtype2
= ptr_type_node
;
7920 if (use_aeabi_atexit
)
7922 argtype1
= fn_ptr_type
;
7923 argtype0
= ptr_type_node
;
7927 argtype1
= ptr_type_node
;
7928 argtype0
= fn_ptr_type
;
7930 /* And the final __cxa_atexit type. */
7931 fn_type
= build_function_type_list (integer_type_node
,
7932 argtype0
, argtype1
, argtype2
,
7934 if (use_aeabi_atexit
)
7935 name
= "__aeabi_atexit";
7937 name
= "__cxa_atexit";
7941 /* The declaration for `atexit' is:
7943 int atexit (void (*)());
7945 We build up the argument types and then the function type
7947 fn_ptr_type
= get_atexit_fn_ptr_type ();
7948 /* Build the final atexit type. */
7949 fn_type
= build_function_type_list (integer_type_node
,
7950 fn_ptr_type
, NULL_TREE
);
7954 /* Now, build the function declaration. */
7955 push_lang_context (lang_name_c
);
7956 atexit_fndecl
= build_library_fn_ptr (name
, fn_type
, ECF_LEAF
| ECF_NOTHROW
);
7957 mark_used (atexit_fndecl
);
7958 pop_lang_context ();
7959 atexit_node
= decay_conversion (atexit_fndecl
, tf_warning_or_error
);
7964 /* Like get_atexit_node, but for thread-local cleanups. */
7967 get_thread_atexit_node (void)
7969 /* The declaration for `__cxa_thread_atexit' is:
7971 int __cxa_thread_atexit (void (*)(void *), void *, void *) */
7972 tree fn_type
= build_function_type_list (integer_type_node
,
7973 get_atexit_fn_ptr_type (),
7974 ptr_type_node
, ptr_type_node
,
7977 /* Now, build the function declaration. */
7978 tree atexit_fndecl
= build_library_fn_ptr ("__cxa_thread_atexit", fn_type
,
7979 ECF_LEAF
| ECF_NOTHROW
);
7980 return decay_conversion (atexit_fndecl
, tf_warning_or_error
);
7983 /* Returns the __dso_handle VAR_DECL. */
7986 get_dso_handle_node (void)
7988 if (dso_handle_node
)
7989 return dso_handle_node
;
7991 /* Declare the variable. */
7992 dso_handle_node
= declare_global_var (get_identifier ("__dso_handle"),
7995 #ifdef HAVE_GAS_HIDDEN
7996 if (dso_handle_node
!= error_mark_node
)
7998 DECL_VISIBILITY (dso_handle_node
) = VISIBILITY_HIDDEN
;
7999 DECL_VISIBILITY_SPECIFIED (dso_handle_node
) = 1;
8003 return dso_handle_node
;
8006 /* Begin a new function with internal linkage whose job will be simply
8007 to destroy some particular variable. */
8009 static GTY(()) int start_cleanup_cnt
;
8012 start_cleanup_fn (void)
8017 bool use_cxa_atexit
= flag_use_cxa_atexit
8018 && !targetm
.cxx
.use_atexit_for_cxa_atexit ();
8020 push_to_top_level ();
8022 /* No need to mangle this. */
8023 push_lang_context (lang_name_c
);
8025 /* Build the name of the function. */
8026 sprintf (name
, "__tcf_%d", start_cleanup_cnt
++);
8027 /* Build the function declaration. */
8028 fntype
= TREE_TYPE (get_atexit_fn_ptr_type ());
8029 fndecl
= build_lang_decl (FUNCTION_DECL
, get_identifier (name
), fntype
);
8030 /* It's a function with internal linkage, generated by the
8032 TREE_PUBLIC (fndecl
) = 0;
8033 DECL_ARTIFICIAL (fndecl
) = 1;
8034 /* Make the function `inline' so that it is only emitted if it is
8035 actually needed. It is unlikely that it will be inlined, since
8036 it is only called via a function pointer, but we avoid unnecessary
8037 emissions this way. */
8038 DECL_DECLARED_INLINE_P (fndecl
) = 1;
8039 DECL_INTERFACE_KNOWN (fndecl
) = 1;
8040 /* Build the parameter. */
8043 tree parmdecl
= cp_build_parm_decl (fndecl
, NULL_TREE
, ptr_type_node
);
8044 TREE_USED (parmdecl
) = 1;
8045 DECL_READ_P (parmdecl
) = 1;
8046 DECL_ARGUMENTS (fndecl
) = parmdecl
;
8050 start_preparsed_function (fndecl
, NULL_TREE
, SF_PRE_PARSED
);
8052 pop_lang_context ();
8054 return current_function_decl
;
8057 /* Finish the cleanup function begun by start_cleanup_fn. */
8060 end_cleanup_fn (void)
8062 expand_or_defer_fn (finish_function (/*inline_p=*/false));
8064 pop_from_top_level ();
8067 /* Generate code to handle the destruction of DECL, an object with
8068 static storage duration. */
8071 register_dtor_fn (tree decl
)
8078 bool ob_parm
, dso_parm
, use_dtor
;
8079 tree arg0
, arg1
, arg2
;
8082 type
= TREE_TYPE (decl
);
8083 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type
))
8086 /* If we're using "__cxa_atexit" (or "__cxa_thread_atexit" or
8087 "__aeabi_atexit"), and DECL is a class object, we can just pass the
8088 destructor to "__cxa_atexit"; we don't have to build a temporary
8089 function to do the cleanup. */
8090 dso_parm
= (flag_use_cxa_atexit
8091 && !targetm
.cxx
.use_atexit_for_cxa_atexit ());
8092 ob_parm
= (CP_DECL_THREAD_LOCAL_P (decl
) || dso_parm
);
8093 use_dtor
= ob_parm
&& CLASS_TYPE_P (type
);
8096 cleanup
= get_class_binding (type
, complete_dtor_identifier
);
8098 /* Make sure it is accessible. */
8099 perform_or_defer_access_check (TYPE_BINFO (type
), cleanup
, cleanup
,
8100 tf_warning_or_error
);
8104 /* Call build_cleanup before we enter the anonymous function so
8105 that any access checks will be done relative to the current
8106 scope, rather than the scope of the anonymous function. */
8107 build_cleanup (decl
);
8109 /* Now start the function. */
8110 cleanup
= start_cleanup_fn ();
8112 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
8113 to the original function, rather than the anonymous one. That
8114 will make the back end think that nested functions are in use,
8115 which causes confusion. */
8116 push_deferring_access_checks (dk_no_check
);
8117 fcall
= build_cleanup (decl
);
8118 pop_deferring_access_checks ();
8120 /* Create the body of the anonymous function. */
8121 compound_stmt
= begin_compound_stmt (BCS_FN_BODY
);
8122 finish_expr_stmt (fcall
);
8123 finish_compound_stmt (compound_stmt
);
8127 /* Call atexit with the cleanup function. */
8128 mark_used (cleanup
);
8129 cleanup
= build_address (cleanup
);
8131 if (CP_DECL_THREAD_LOCAL_P (decl
))
8132 atex_node
= get_thread_atexit_node ();
8134 atex_node
= get_atexit_node ();
8138 /* We must convert CLEANUP to the type that "__cxa_atexit"
8140 cleanup
= build_nop (get_atexit_fn_ptr_type (), cleanup
);
8141 /* "__cxa_atexit" will pass the address of DECL to the
8142 cleanup function. */
8144 addr
= build_address (decl
);
8145 /* The declared type of the parameter to "__cxa_atexit" is
8146 "void *". For plain "T*", we could just let the
8147 machinery in cp_build_function_call convert it -- but if the
8148 type is "cv-qualified T *", then we need to convert it
8149 before passing it in, to avoid spurious errors. */
8150 addr
= build_nop (ptr_type_node
, addr
);
8153 /* Since the cleanup functions we build ignore the address
8154 they're given, there's no reason to pass the actual address
8155 in, and, in general, it's cheaper to pass NULL than any
8157 addr
= null_pointer_node
;
8160 arg2
= cp_build_addr_expr (get_dso_handle_node (),
8161 tf_warning_or_error
);
8163 /* Just pass NULL to the dso handle parm if we don't actually
8164 have a DSO handle on this target. */
8165 arg2
= null_pointer_node
;
8171 if (!CP_DECL_THREAD_LOCAL_P (decl
)
8172 && targetm
.cxx
.use_aeabi_atexit ())
8188 return cp_build_function_call_nary (atex_node
, tf_warning_or_error
,
8189 arg0
, arg1
, arg2
, NULL_TREE
);
8192 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
8193 is its initializer. Generate code to handle the construction
8194 and destruction of DECL. */
8197 expand_static_init (tree decl
, tree init
)
8199 gcc_assert (VAR_P (decl
));
8200 gcc_assert (TREE_STATIC (decl
));
8202 /* Some variables require no dynamic initialization. */
8203 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl
)))
8205 /* Make sure the destructor is callable. */
8206 cxx_maybe_build_cleanup (decl
, tf_warning_or_error
);
8211 if (CP_DECL_THREAD_LOCAL_P (decl
) && DECL_GNU_TLS_P (decl
)
8212 && !DECL_FUNCTION_SCOPE_P (decl
))
8215 error ("non-local variable %qD declared %<__thread%> "
8216 "needs dynamic initialization", decl
);
8218 error ("non-local variable %qD declared %<__thread%> "
8219 "has a non-trivial destructor", decl
);
8220 static bool informed
;
8223 inform (DECL_SOURCE_LOCATION (decl
),
8224 "C++11 %<thread_local%> allows dynamic initialization "
8231 if (DECL_FUNCTION_SCOPE_P (decl
))
8233 /* Emit code to perform this initialization but once. */
8234 tree if_stmt
= NULL_TREE
, inner_if_stmt
= NULL_TREE
;
8235 tree then_clause
= NULL_TREE
, inner_then_clause
= NULL_TREE
;
8236 tree guard
, guard_addr
;
8238 /* We don't need thread-safety code for thread-local vars. */
8239 bool thread_guard
= (flag_threadsafe_statics
8240 && !CP_DECL_THREAD_LOCAL_P (decl
));
8242 /* Emit code to perform this initialization but once. This code
8245 static <type> guard;
8246 if (!__atomic_load (guard.first_byte)) {
8247 if (__cxa_guard_acquire (&guard)) {
8250 // Do initialization.
8251 flag = true; __cxa_guard_release (&guard);
8252 // Register variable for destruction at end of program.
8254 if (!flag) __cxa_guard_abort (&guard);
8259 Note that the `flag' variable is only set to 1 *after* the
8260 initialization is complete. This ensures that an exception,
8261 thrown during the construction, will cause the variable to
8262 reinitialized when we pass through this code again, as per:
8266 If the initialization exits by throwing an exception, the
8267 initialization is not complete, so it will be tried again
8268 the next time control enters the declaration.
8270 This process should be thread-safe, too; multiple threads
8271 should not be able to initialize the variable more than
8274 /* Create the guard variable. */
8275 guard
= get_guard (decl
);
8277 /* Begin the conditional initialization. */
8278 if_stmt
= begin_if_stmt ();
8280 finish_if_stmt_cond (get_guard_cond (guard
, thread_guard
), if_stmt
);
8281 then_clause
= begin_compound_stmt (BCS_NO_SCOPE
);
8285 tree vfntype
= NULL_TREE
;
8286 tree acquire_name
, release_name
, abort_name
;
8287 tree acquire_fn
, release_fn
, abort_fn
;
8288 guard_addr
= build_address (guard
);
8290 acquire_name
= get_identifier ("__cxa_guard_acquire");
8291 release_name
= get_identifier ("__cxa_guard_release");
8292 abort_name
= get_identifier ("__cxa_guard_abort");
8293 acquire_fn
= get_global_binding (acquire_name
);
8294 release_fn
= get_global_binding (release_name
);
8295 abort_fn
= get_global_binding (abort_name
);
8297 acquire_fn
= push_library_fn
8298 (acquire_name
, build_function_type_list (integer_type_node
,
8299 TREE_TYPE (guard_addr
),
8301 NULL_TREE
, ECF_NOTHROW
| ECF_LEAF
);
8302 if (!release_fn
|| !abort_fn
)
8303 vfntype
= build_function_type_list (void_type_node
,
8304 TREE_TYPE (guard_addr
),
8307 release_fn
= push_library_fn (release_name
, vfntype
, NULL_TREE
,
8308 ECF_NOTHROW
| ECF_LEAF
);
8310 abort_fn
= push_library_fn (abort_name
, vfntype
, NULL_TREE
,
8311 ECF_NOTHROW
| ECF_LEAF
);
8313 inner_if_stmt
= begin_if_stmt ();
8314 finish_if_stmt_cond (build_call_n (acquire_fn
, 1, guard_addr
),
8317 inner_then_clause
= begin_compound_stmt (BCS_NO_SCOPE
);
8318 begin
= get_target_expr (boolean_false_node
);
8319 flag
= TARGET_EXPR_SLOT (begin
);
8321 TARGET_EXPR_CLEANUP (begin
)
8322 = build3 (COND_EXPR
, void_type_node
, flag
,
8324 build_call_n (abort_fn
, 1, guard_addr
));
8325 CLEANUP_EH_ONLY (begin
) = 1;
8327 /* Do the initialization itself. */
8328 init
= add_stmt_to_compound (begin
, init
);
8329 init
= add_stmt_to_compound
8330 (init
, build2 (MODIFY_EXPR
, void_type_node
, flag
, boolean_true_node
));
8331 init
= add_stmt_to_compound
8332 (init
, build_call_n (release_fn
, 1, guard_addr
));
8335 init
= add_stmt_to_compound (init
, set_guard (guard
));
8337 /* Use atexit to register a function for destroying this static
8339 init
= add_stmt_to_compound (init
, register_dtor_fn (decl
));
8341 finish_expr_stmt (init
);
8345 finish_compound_stmt (inner_then_clause
);
8346 finish_then_clause (inner_if_stmt
);
8347 finish_if_stmt (inner_if_stmt
);
8350 finish_compound_stmt (then_clause
);
8351 finish_then_clause (if_stmt
);
8352 finish_if_stmt (if_stmt
);
8354 else if (CP_DECL_THREAD_LOCAL_P (decl
))
8355 tls_aggregates
= tree_cons (init
, decl
, tls_aggregates
);
8357 static_aggregates
= tree_cons (init
, decl
, static_aggregates
);
8361 /* Make TYPE a complete type based on INITIAL_VALUE.
8362 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
8363 2 if there was no information (in which case assume 0 if DO_DEFAULT),
8364 3 if the initializer list is empty (in pedantic mode). */
8367 cp_complete_array_type (tree
*ptype
, tree initial_value
, bool do_default
)
8370 tree type
, elt_type
;
8372 /* Don't get confused by a CONSTRUCTOR for some other type. */
8373 if (initial_value
&& TREE_CODE (initial_value
) == CONSTRUCTOR
8374 && !BRACE_ENCLOSED_INITIALIZER_P (initial_value
)
8375 && TREE_CODE (TREE_TYPE (initial_value
)) != ARRAY_TYPE
)
8380 unsigned HOST_WIDE_INT i
;
8383 /* An array of character type can be initialized from a
8384 brace-enclosed string constant.
8386 FIXME: this code is duplicated from reshape_init. Probably
8387 we should just call reshape_init here? */
8388 if (char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (*ptype
)))
8389 && TREE_CODE (initial_value
) == CONSTRUCTOR
8390 && !vec_safe_is_empty (CONSTRUCTOR_ELTS (initial_value
)))
8392 vec
<constructor_elt
, va_gc
> *v
= CONSTRUCTOR_ELTS (initial_value
);
8393 tree value
= (*v
)[0].value
;
8395 if (TREE_CODE (value
) == STRING_CST
8396 && v
->length () == 1)
8397 initial_value
= value
;
8400 /* If any of the elements are parameter packs, we can't actually
8401 complete this type now because the array size is dependent. */
8402 if (TREE_CODE (initial_value
) == CONSTRUCTOR
)
8404 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (initial_value
),
8407 if (PACK_EXPANSION_P (value
))
8413 failure
= complete_array_type (ptype
, initial_value
, do_default
);
8415 /* We can create the array before the element type is complete, which
8416 means that we didn't have these two bits set in the original type
8417 either. In completing the type, we are expected to propagate these
8418 bits. See also complete_type which does the same thing for arrays
8421 if (type
!= error_mark_node
&& TYPE_DOMAIN (type
))
8423 elt_type
= TREE_TYPE (type
);
8424 TYPE_NEEDS_CONSTRUCTING (type
) = TYPE_NEEDS_CONSTRUCTING (elt_type
);
8425 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type
)
8426 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (elt_type
);
8432 /* As above, but either give an error or reject zero-size arrays, depending
8436 cp_complete_array_type_or_error (tree
*ptype
, tree initial_value
,
8437 bool do_default
, tsubst_flags_t complain
)
8440 bool sfinae
= !(complain
& tf_error
);
8441 /* In SFINAE context we can't be lenient about zero-size arrays. */
8444 failure
= cp_complete_array_type (ptype
, initial_value
, do_default
);
8450 /* Not an error. */;
8451 else if (failure
== 1)
8452 error ("initializer fails to determine size of %qT", *ptype
);
8453 else if (failure
== 2)
8456 error ("array size missing in %qT", *ptype
);
8458 else if (failure
== 3)
8459 error ("zero-size array %qT", *ptype
);
8460 *ptype
= error_mark_node
;
8465 /* Return zero if something is declared to be a member of type
8466 CTYPE when in the context of CUR_TYPE. STRING is the error
8467 message to print in that case. Otherwise, quietly return 1. */
8470 member_function_or_else (tree ctype
, tree cur_type
, enum overload_flags flags
)
8472 if (ctype
&& ctype
!= cur_type
)
8474 if (flags
== DTOR_FLAG
)
8475 error ("destructor for alien class %qT cannot be a member", ctype
);
8477 error ("constructor for alien class %qT cannot be a member", ctype
);
8483 /* Subroutine of `grokdeclarator'. */
8485 /* Generate errors possibly applicable for a given set of specifiers.
8486 This is for ARM $7.1.2. */
8489 bad_specifiers (tree object
,
8490 enum bad_spec_place type
,
8496 const location_t
* locations
)
8502 error_at (locations
[ds_virtual
],
8503 "%qD declared as a %<virtual%> variable", object
);
8505 error ("%<const%> and %<volatile%> function specifiers on "
8506 "%qD invalid in variable declaration", object
);
8510 error_at (locations
[ds_virtual
],
8511 "%qD declared as a %<virtual%> parameter", object
);
8513 error_at (locations
[ds_inline
],
8514 "%qD declared as an %<inline%> parameter", object
);
8516 error ("%<const%> and %<volatile%> function specifiers on "
8517 "%qD invalid in parameter declaration", object
);
8521 error_at (locations
[ds_virtual
],
8522 "%qD declared as a %<virtual%> type", object
);
8524 error_at (locations
[ds_inline
],
8525 "%qD declared as an %<inline%> type", object
);
8527 error ("%<const%> and %<volatile%> function specifiers on "
8528 "%qD invalid in type declaration", object
);
8532 error_at (locations
[ds_virtual
],
8533 "%qD declared as a %<virtual%> field", object
);
8535 error_at (locations
[ds_inline
],
8536 "%qD declared as an %<inline%> field", object
);
8538 error ("%<const%> and %<volatile%> function specifiers on "
8539 "%qD invalid in field declaration", object
);
8545 error ("%q+D declared as a friend", object
);
8547 && !flag_noexcept_type
8548 && (TREE_CODE (object
) == TYPE_DECL
8549 || (!TYPE_PTRFN_P (TREE_TYPE (object
))
8550 && !TYPE_REFFN_P (TREE_TYPE (object
))
8551 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (object
)))))
8552 error ("%q+D declared with an exception specification", object
);
8555 /* DECL is a member function or static data member and is presently
8556 being defined. Check that the definition is taking place in a
8560 check_class_member_definition_namespace (tree decl
)
8562 /* These checks only apply to member functions and static data
8564 gcc_assert (VAR_OR_FUNCTION_DECL_P (decl
));
8565 /* We check for problems with specializations in pt.c in
8566 check_specialization_namespace, where we can issue better
8568 if (processing_specialization
)
8570 /* We check this in check_explicit_instantiation_namespace. */
8571 if (processing_explicit_instantiation
)
8575 A member function definition that appears outside of the
8576 class definition shall appear in a namespace scope enclosing
8577 the class definition.
8581 The definition for a static data member shall appear in a
8582 namespace scope enclosing the member's class definition. */
8583 if (!is_ancestor (current_namespace
, DECL_CONTEXT (decl
)))
8584 permerror (input_location
, "definition of %qD is not in namespace enclosing %qT",
8585 decl
, DECL_CONTEXT (decl
));
8588 /* Build a PARM_DECL for the "this" parameter of FN. TYPE is the
8589 METHOD_TYPE for a non-static member function; QUALS are the
8590 cv-qualifiers that apply to the function. */
8593 build_this_parm (tree fn
, tree type
, cp_cv_quals quals
)
8598 cp_cv_quals this_quals
;
8600 if (CLASS_TYPE_P (type
))
8603 = cp_build_qualified_type (type
, quals
& ~TYPE_QUAL_RESTRICT
);
8604 this_type
= build_pointer_type (this_type
);
8607 this_type
= type_of_this_parm (type
);
8608 /* The `this' parameter is implicitly `const'; it cannot be
8610 this_quals
= (quals
& TYPE_QUAL_RESTRICT
) | TYPE_QUAL_CONST
;
8611 qual_type
= cp_build_qualified_type (this_type
, this_quals
);
8612 parm
= build_artificial_parm (fn
, this_identifier
, qual_type
);
8613 cp_apply_type_quals_to_decl (this_quals
, parm
);
8617 /* DECL is a static member function. Complain if it was declared
8618 with function-cv-quals. */
8621 check_static_quals (tree decl
, cp_cv_quals quals
)
8623 if (quals
!= TYPE_UNQUALIFIED
)
8624 error ("static member function %q#D declared with type qualifiers",
8628 // Check that FN takes no arguments and returns bool.
8630 check_concept_fn (tree fn
)
8632 // A constraint is nullary.
8633 if (DECL_ARGUMENTS (fn
))
8634 error_at (DECL_SOURCE_LOCATION (fn
),
8635 "concept %q#D declared with function parameters", fn
);
8637 // The declared return type of the concept shall be bool, and
8638 // it shall not be deduced from it definition.
8639 tree type
= TREE_TYPE (TREE_TYPE (fn
));
8641 error_at (DECL_SOURCE_LOCATION (fn
),
8642 "concept %q#D declared with a deduced return type", fn
);
8643 else if (type
!= boolean_type_node
)
8644 error_at (DECL_SOURCE_LOCATION (fn
),
8645 "concept %q#D with non-%<bool%> return type %qT", fn
, type
);
8648 /* Helper function. Replace the temporary this parameter injected
8649 during cp_finish_omp_declare_simd with the real this parameter. */
8652 declare_simd_adjust_this (tree
*tp
, int *walk_subtrees
, void *data
)
8654 tree this_parm
= (tree
) data
;
8655 if (TREE_CODE (*tp
) == PARM_DECL
8656 && DECL_NAME (*tp
) == this_identifier
8657 && *tp
!= this_parm
)
8659 else if (TYPE_P (*tp
))
8664 /* CTYPE is class type, or null if non-class.
8665 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
8667 DECLARATOR is the function's name.
8668 PARMS is a chain of PARM_DECLs for the function.
8669 VIRTUALP is truthvalue of whether the function is virtual or not.
8670 FLAGS are to be passed through to `grokclassfn'.
8671 QUALS are qualifiers indicating whether the function is `const'
8673 RAISES is a list of exceptions that this function can raise.
8674 CHECK is 1 if we must find this method in CTYPE, 0 if we should
8675 not look, and -1 if we should not call `grokclassfn' at all.
8677 SFK is the kind of special function (if any) for the new function.
8679 Returns `NULL_TREE' if something goes wrong, after issuing
8680 applicable error messages. */
8683 grokfndecl (tree ctype
,
8687 tree orig_declarator
,
8688 const cp_decl_specifier_seq
*declspecs
,
8691 enum overload_flags flags
,
8693 cp_ref_qualifier rqual
,
8700 special_function_kind sfk
,
8702 bool late_return_type_p
,
8706 location_t location
)
8709 int staticp
= ctype
&& TREE_CODE (type
) == FUNCTION_TYPE
;
8712 if (location
== UNKNOWN_LOCATION
)
8713 location
= input_location
;
8715 // Was the concept specifier present?
8716 bool concept_p
= inlinep
& 4;
8718 // Concept declarations must have a corresponding definition.
8719 if (concept_p
&& !funcdef_flag
)
8721 error_at (location
, "concept %qD has no definition", declarator
);
8725 type
= build_cp_fntype_variant (type
, rqual
, raises
, late_return_type_p
);
8727 decl
= build_lang_decl_loc (location
, FUNCTION_DECL
, declarator
, type
);
8729 /* Set the constraints on the declaration. */
8732 tree tmpl_reqs
= NULL_TREE
;
8733 if (processing_template_decl
> template_class_depth (ctype
))
8734 tmpl_reqs
= TEMPLATE_PARMS_CONSTRAINTS (current_template_parms
);
8736 /* Adjust the required expression into a constraint. */
8738 decl_reqs
= normalize_expression (decl_reqs
);
8740 tree ci
= build_constraints (tmpl_reqs
, decl_reqs
);
8741 set_constraints (decl
, ci
);
8744 if (TREE_CODE (type
) == METHOD_TYPE
)
8746 tree parm
= build_this_parm (decl
, type
, quals
);
8747 DECL_CHAIN (parm
) = parms
;
8750 /* Allocate space to hold the vptr bit if needed. */
8751 SET_DECL_ALIGN (decl
, MINIMUM_METHOD_BOUNDARY
);
8754 DECL_ARGUMENTS (decl
) = parms
;
8755 for (t
= parms
; t
; t
= DECL_CHAIN (t
))
8756 DECL_CONTEXT (t
) = decl
;
8758 /* Propagate volatile out from type to decl. */
8759 if (TYPE_VOLATILE (type
))
8760 TREE_THIS_VOLATILE (decl
) = 1;
8762 /* Setup decl according to sfk. */
8765 case sfk_constructor
:
8766 case sfk_copy_constructor
:
8767 case sfk_move_constructor
:
8768 DECL_CXX_CONSTRUCTOR_P (decl
) = 1;
8769 DECL_NAME (decl
) = ctor_identifier
;
8771 case sfk_destructor
:
8772 DECL_CXX_DESTRUCTOR_P (decl
) = 1;
8773 DECL_NAME (decl
) = dtor_identifier
;
8779 if (friendp
&& TREE_CODE (orig_declarator
) == TEMPLATE_ID_EXPR
)
8783 "defining explicit specialization %qD in friend declaration",
8787 tree fns
= TREE_OPERAND (orig_declarator
, 0);
8788 tree args
= TREE_OPERAND (orig_declarator
, 1);
8790 if (PROCESSING_REAL_TEMPLATE_DECL_P ())
8792 /* Something like `template <class T> friend void f<T>()'. */
8794 "invalid use of template-id %qD in declaration "
8795 "of primary template",
8801 /* A friend declaration of the form friend void f<>(). Record
8802 the information in the TEMPLATE_ID_EXPR. */
8803 SET_DECL_IMPLICIT_INSTANTIATION (decl
);
8805 gcc_assert (identifier_p (fns
) || TREE_CODE (fns
) == OVERLOAD
);
8806 DECL_TEMPLATE_INFO (decl
) = build_template_info (fns
, args
);
8808 for (t
= TYPE_ARG_TYPES (TREE_TYPE (decl
)); t
; t
= TREE_CHAIN (t
))
8809 if (TREE_PURPOSE (t
)
8810 && TREE_CODE (TREE_PURPOSE (t
)) == DEFAULT_ARG
)
8812 error_at (defarg_location (TREE_PURPOSE (t
)),
8813 "default arguments are not allowed in declaration "
8814 "of friend template specialization %qD",
8821 error_at (declspecs
->locations
[ds_inline
],
8822 "%<inline%> is not allowed in declaration of friend "
8823 "template specialization %qD",
8830 /* C++17 11.3.6/4: "If a friend declaration specifies a default argument
8831 expression, that declaration shall be a definition..." */
8832 if (friendp
&& !funcdef_flag
)
8834 for (tree t
= FUNCTION_FIRST_USER_PARMTYPE (decl
);
8835 t
&& t
!= void_list_node
; t
= TREE_CHAIN (t
))
8836 if (TREE_PURPOSE (t
))
8838 permerror (DECL_SOURCE_LOCATION (decl
),
8839 "friend declaration of %qD specifies default "
8840 "arguments and isn't a definition", decl
);
8845 /* If this decl has namespace scope, set that up. */
8847 set_decl_namespace (decl
, in_namespace
, friendp
);
8849 DECL_CONTEXT (decl
) = FROB_CONTEXT (current_decl_namespace ());
8851 /* `main' and builtins have implicit 'C' linkage. */
8852 if (ctype
== NULL_TREE
8853 && DECL_FILE_SCOPE_P (decl
)
8854 && current_lang_name
== lang_name_cplusplus
8855 && (MAIN_NAME_P (declarator
)
8856 || (IDENTIFIER_LENGTH (declarator
) > 10
8857 && IDENTIFIER_POINTER (declarator
)[0] == '_'
8858 && IDENTIFIER_POINTER (declarator
)[1] == '_'
8859 && strncmp (IDENTIFIER_POINTER (declarator
)+2,
8860 "builtin_", 8) == 0)
8861 || (targetcm
.cxx_implicit_extern_c
8862 && (targetcm
.cxx_implicit_extern_c
8863 (IDENTIFIER_POINTER (declarator
))))))
8864 SET_DECL_LANGUAGE (decl
, lang_c
);
8866 /* Should probably propagate const out from type to decl I bet (mrs). */
8869 DECL_STATIC_FUNCTION_P (decl
) = 1;
8870 DECL_CONTEXT (decl
) = ctype
;
8874 DECL_DELETED_FN (decl
) = 1;
8878 DECL_CONTEXT (decl
) = ctype
;
8880 check_class_member_definition_namespace (decl
);
8883 if (ctype
== NULL_TREE
&& DECL_MAIN_P (decl
))
8885 if (PROCESSING_REAL_TEMPLATE_DECL_P())
8886 error_at (location
, "cannot declare %<::main%> to be a template");
8888 error_at (declspecs
->locations
[ds_inline
],
8889 "cannot declare %<::main%> to be inline");
8891 error_at (declspecs
->locations
[ds_constexpr
],
8892 "cannot declare %<::main%> to be %<constexpr%>");
8894 error_at (location
, "cannot declare %<::main%> to be static");
8899 /* Members of anonymous types and local classes have no linkage; make
8900 them internal. If a typedef is made later, this will be changed. */
8901 if (ctype
&& (!TREE_PUBLIC (TYPE_MAIN_DECL (ctype
))
8902 || decl_function_context (TYPE_MAIN_DECL (ctype
))))
8905 if (publicp
&& cxx_dialect
== cxx98
)
8907 /* [basic.link]: A name with no linkage (notably, the name of a class
8908 or enumeration declared in a local scope) shall not be used to
8909 declare an entity with linkage.
8911 DR 757 relaxes this restriction for C++0x. */
8912 no_linkage_error (decl
);
8915 TREE_PUBLIC (decl
) = publicp
;
8918 DECL_INTERFACE_KNOWN (decl
) = 1;
8919 DECL_NOT_REALLY_EXTERN (decl
) = 1;
8922 /* If the declaration was declared inline, mark it as such. */
8925 DECL_DECLARED_INLINE_P (decl
) = 1;
8927 DECL_COMDAT (decl
) = 1;
8930 DECL_DECLARED_CONSTEXPR_P (decl
) = true;
8932 // If the concept declaration specifier was found, check
8933 // that the declaration satisfies the necessary requirements.
8936 DECL_DECLARED_CONCEPT_P (decl
) = true;
8937 check_concept_fn (decl
);
8940 DECL_EXTERNAL (decl
) = 1;
8941 if (TREE_CODE (type
) == FUNCTION_TYPE
)
8944 TREE_TYPE (decl
) = apply_memfn_quals (TREE_TYPE (decl
),
8951 ? G_("static member function %qD cannot have cv-qualifier")
8952 : G_("non-member function %qD cannot have cv-qualifier"),
8954 quals
= TYPE_UNQUALIFIED
;
8960 ? G_("static member function %qD cannot have ref-qualifier")
8961 : G_("non-member function %qD cannot have ref-qualifier"),
8963 rqual
= REF_QUAL_NONE
;
8967 if (deduction_guide_p (decl
))
8969 if (!DECL_NAMESPACE_SCOPE_P (decl
))
8971 error_at (location
, "deduction guide %qD must be declared at "
8972 "namespace scope", decl
);
8977 "deduction guide %qD must not have a function body", decl
);
8979 else if (IDENTIFIER_ANY_OP_P (DECL_NAME (decl
))
8980 && !grok_op_properties (decl
, /*complain=*/true))
8982 else if (UDLIT_OPER_P (DECL_NAME (decl
)))
8984 bool long_long_unsigned_p
;
8986 const char *suffix
= NULL
;
8987 /* [over.literal]/6: Literal operators shall not have C linkage. */
8988 if (DECL_LANGUAGE (decl
) == lang_c
)
8990 error_at (location
, "literal operator with C linkage");
8991 maybe_show_extern_c_location ();
8995 if (DECL_NAMESPACE_SCOPE_P (decl
))
8997 if (!check_literal_operator_args (decl
, &long_long_unsigned_p
,
9000 error_at (location
, "%qD has invalid argument list", decl
);
9004 suffix
= UDLIT_OP_SUFFIX (DECL_NAME (decl
));
9005 if (long_long_unsigned_p
)
9007 if (cpp_interpret_int_suffix (parse_in
, suffix
, strlen (suffix
)))
9008 warning_at (location
, 0, "integer suffix %qs"
9009 " shadowed by implementation", suffix
);
9011 else if (long_double_p
)
9013 if (cpp_interpret_float_suffix (parse_in
, suffix
, strlen (suffix
)))
9014 warning_at (location
, 0, "floating point suffix %qs"
9015 " shadowed by implementation", suffix
);
9018 if (suffix
[0] != '_'
9019 && !in_system_header_at (location
)
9020 && !current_function_decl
&& !(friendp
&& !funcdef_flag
))
9021 warning_at (location
, OPT_Wliteral_suffix
,
9022 "literal operator suffixes not preceded by %<_%>"
9023 " are reserved for future standardization");
9027 error_at (location
, "%qD must be a non-member function", decl
);
9033 /* Make the init_value nonzero so pushdecl knows this is not
9034 tentative. error_mark_node is replaced later with the BLOCK. */
9035 DECL_INITIAL (decl
) = error_mark_node
;
9037 if (TYPE_NOTHROW_P (type
) || nothrow_libfn_p (decl
))
9038 TREE_NOTHROW (decl
) = 1;
9040 if (flag_openmp
|| flag_openmp_simd
)
9042 /* Adjust "omp declare simd" attributes. */
9043 tree ods
= lookup_attribute ("omp declare simd", *attrlist
);
9047 for (attr
= ods
; attr
;
9048 attr
= lookup_attribute ("omp declare simd", TREE_CHAIN (attr
)))
9050 if (TREE_CODE (type
) == METHOD_TYPE
)
9051 walk_tree (&TREE_VALUE (attr
), declare_simd_adjust_this
,
9052 DECL_ARGUMENTS (decl
), NULL
);
9053 if (TREE_VALUE (attr
) != NULL_TREE
)
9055 tree cl
= TREE_VALUE (TREE_VALUE (attr
));
9056 cl
= c_omp_declare_simd_clauses_to_numbers
9057 (DECL_ARGUMENTS (decl
), cl
);
9059 TREE_VALUE (TREE_VALUE (attr
)) = cl
;
9061 TREE_VALUE (attr
) = NULL_TREE
;
9067 /* Caller will do the rest of this. */
9071 if (ctype
!= NULL_TREE
)
9072 grokclassfn (ctype
, decl
, flags
);
9075 if (cxx_dialect
>= cxx11
9076 && DECL_DESTRUCTOR_P (decl
)
9077 && !TYPE_BEING_DEFINED (DECL_CONTEXT (decl
))
9078 && !processing_template_decl
)
9079 deduce_noexcept_on_destructor (decl
);
9081 decl
= check_explicit_specialization (orig_declarator
, decl
,
9084 4 * (friendp
!= 0) +
9087 if (decl
== error_mark_node
)
9090 if (DECL_STATIC_FUNCTION_P (decl
))
9091 check_static_quals (decl
, quals
);
9095 cplus_decl_attributes (&decl
, *attrlist
, 0);
9096 *attrlist
= NULL_TREE
;
9099 /* Check main's type after attributes have been applied. */
9100 if (ctype
== NULL_TREE
&& DECL_MAIN_P (decl
))
9102 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl
)),
9105 tree oldtypeargs
= TYPE_ARG_TYPES (TREE_TYPE (decl
));
9107 error_at (declspecs
->locations
[ds_type_spec
],
9108 "%<::main%> must return %<int%>");
9109 newtype
= build_function_type (integer_type_node
, oldtypeargs
);
9110 TREE_TYPE (decl
) = newtype
;
9113 check_main_parameter_types (decl
);
9116 if (ctype
!= NULL_TREE
&& check
)
9118 tree old_decl
= check_classfn (ctype
, decl
,
9119 (processing_template_decl
9120 > template_class_depth (ctype
))
9121 ? current_template_parms
9124 if (old_decl
== error_mark_node
)
9132 if (TREE_CODE (old_decl
) == TEMPLATE_DECL
)
9133 /* Because grokfndecl is always supposed to return a
9134 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
9135 here. We depend on our callers to figure out that its
9136 really a template that's being returned. */
9137 old_decl
= DECL_TEMPLATE_RESULT (old_decl
);
9139 if (DECL_STATIC_FUNCTION_P (old_decl
)
9140 && TREE_CODE (TREE_TYPE (decl
)) == METHOD_TYPE
)
9142 /* Remove the `this' parm added by grokclassfn. */
9143 revert_static_member_fn (decl
);
9144 check_static_quals (decl
, quals
);
9146 if (DECL_ARTIFICIAL (old_decl
))
9148 error ("definition of implicitly-declared %qD", old_decl
);
9151 else if (DECL_DEFAULTED_FN (old_decl
))
9153 error ("definition of explicitly-defaulted %q+D", decl
);
9154 inform (DECL_SOURCE_LOCATION (old_decl
),
9155 "%q#D explicitly defaulted here", old_decl
);
9159 /* Since we've smashed OLD_DECL to its
9160 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
9161 if (TREE_CODE (decl
) == TEMPLATE_DECL
)
9162 decl
= DECL_TEMPLATE_RESULT (decl
);
9164 /* Attempt to merge the declarations. This can fail, in
9165 the case of some invalid specialization declarations. */
9166 pushed_scope
= push_scope (ctype
);
9167 ok
= duplicate_decls (decl
, old_decl
, friendp
);
9169 pop_scope (pushed_scope
);
9172 error ("no %q#D member function declared in class %qT",
9176 if (ok
== error_mark_node
)
9182 if (DECL_CONSTRUCTOR_P (decl
) && !grok_ctor_properties (ctype
, decl
))
9185 if (ctype
== NULL_TREE
|| check
)
9189 DECL_VIRTUAL_P (decl
) = 1;
9194 /* decl is a FUNCTION_DECL.
9195 specifiers are the parsed virt-specifiers.
9197 Set flags to reflect the virt-specifiers.
9202 set_virt_specifiers (tree decl
, cp_virt_specifiers specifiers
)
9204 if (decl
== NULL_TREE
)
9206 if (specifiers
& VIRT_SPEC_OVERRIDE
)
9207 DECL_OVERRIDE_P (decl
) = 1;
9208 if (specifiers
& VIRT_SPEC_FINAL
)
9209 DECL_FINAL_P (decl
) = 1;
9213 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
9214 the linkage that DECL will receive in the object file. */
9217 set_linkage_for_static_data_member (tree decl
)
9219 /* A static data member always has static storage duration and
9220 external linkage. Note that static data members are forbidden in
9221 local classes -- the only situation in which a class has
9222 non-external linkage. */
9223 TREE_PUBLIC (decl
) = 1;
9224 TREE_STATIC (decl
) = 1;
9225 /* For non-template classes, static data members are always put
9226 out in exactly those files where they are defined, just as
9227 with ordinary namespace-scope variables. */
9228 if (!processing_template_decl
)
9229 DECL_INTERFACE_KNOWN (decl
) = 1;
9232 /* Create a VAR_DECL named NAME with the indicated TYPE.
9234 If SCOPE is non-NULL, it is the class type or namespace containing
9235 the variable. If SCOPE is NULL, the variable should is created in
9236 the innermost enclosing scope. */
9239 grokvardecl (tree type
,
9241 tree orig_declarator
,
9242 const cp_decl_specifier_seq
*declspecs
,
9251 tree explicit_scope
;
9253 gcc_assert (!name
|| identifier_p (name
));
9255 bool constp
= (type_quals
& TYPE_QUAL_CONST
) != 0;
9256 bool volatilep
= (type_quals
& TYPE_QUAL_VOLATILE
) != 0;
9258 /* Compute the scope in which to place the variable, but remember
9259 whether or not that scope was explicitly specified by the user. */
9260 explicit_scope
= scope
;
9263 /* An explicit "extern" specifier indicates a namespace-scope
9265 if (declspecs
->storage_class
== sc_extern
)
9266 scope
= current_decl_namespace ();
9267 else if (!at_function_scope_p ())
9268 scope
= current_scope ();
9272 && (/* If the variable is a namespace-scope variable declared in a
9273 template, we need DECL_LANG_SPECIFIC. */
9274 (TREE_CODE (scope
) == NAMESPACE_DECL
&& processing_template_decl
)
9275 /* Similarly for namespace-scope variables with language linkage
9277 || (TREE_CODE (scope
) == NAMESPACE_DECL
9278 && current_lang_name
!= lang_name_cplusplus
)
9279 /* Similarly for static data members. */
9281 /* Similarly for explicit specializations. */
9283 && TREE_CODE (orig_declarator
) == TEMPLATE_ID_EXPR
)))
9284 decl
= build_lang_decl (VAR_DECL
, name
, type
);
9286 decl
= build_decl (input_location
, VAR_DECL
, name
, type
);
9288 if (explicit_scope
&& TREE_CODE (explicit_scope
) == NAMESPACE_DECL
)
9289 set_decl_namespace (decl
, explicit_scope
, 0);
9291 DECL_CONTEXT (decl
) = FROB_CONTEXT (scope
);
9293 if (declspecs
->storage_class
== sc_extern
)
9295 DECL_THIS_EXTERN (decl
) = 1;
9296 DECL_EXTERNAL (decl
) = !initialized
;
9299 if (DECL_CLASS_SCOPE_P (decl
))
9301 set_linkage_for_static_data_member (decl
);
9302 /* This function is only called with out-of-class definitions. */
9303 DECL_EXTERNAL (decl
) = 0;
9304 check_class_member_definition_namespace (decl
);
9306 /* At top level, either `static' or no s.c. makes a definition
9307 (perhaps tentative), and absence of `static' makes it public. */
9308 else if (toplevel_bindings_p ())
9310 TREE_PUBLIC (decl
) = (declspecs
->storage_class
!= sc_static
9311 && (DECL_THIS_EXTERN (decl
)
9315 TREE_STATIC (decl
) = ! DECL_EXTERNAL (decl
);
9317 /* Not at top level, only `static' makes a static definition. */
9320 TREE_STATIC (decl
) = declspecs
->storage_class
== sc_static
;
9321 TREE_PUBLIC (decl
) = DECL_EXTERNAL (decl
);
9324 if (decl_spec_seq_has_spec_p (declspecs
, ds_thread
))
9326 if (DECL_EXTERNAL (decl
) || TREE_STATIC (decl
))
9328 CP_DECL_THREAD_LOCAL_P (decl
) = true;
9329 if (!processing_template_decl
)
9330 set_decl_tls_model (decl
, decl_default_tls_model (decl
));
9332 if (declspecs
->gnu_thread_keyword_p
)
9333 SET_DECL_GNU_TLS_P (decl
);
9336 /* If the type of the decl has no linkage, make sure that we'll
9337 notice that in mark_used. */
9338 if (cxx_dialect
> cxx98
9339 && decl_linkage (decl
) != lk_none
9340 && DECL_LANG_SPECIFIC (decl
) == NULL
9341 && !DECL_EXTERN_C_P (decl
)
9342 && no_linkage_check (TREE_TYPE (decl
), /*relaxed_p=*/false))
9343 retrofit_lang_decl (decl
);
9345 if (TREE_PUBLIC (decl
))
9347 /* [basic.link]: A name with no linkage (notably, the name of a class
9348 or enumeration declared in a local scope) shall not be used to
9349 declare an entity with linkage.
9351 DR 757 relaxes this restriction for C++0x. */
9352 if (cxx_dialect
< cxx11
)
9353 no_linkage_error (decl
);
9356 DECL_INTERFACE_KNOWN (decl
) = 1;
9358 if (DECL_NAME (decl
)
9359 && MAIN_NAME_P (DECL_NAME (decl
))
9360 && scope
== global_namespace
)
9361 error ("cannot declare %<::main%> to be a global variable");
9363 /* Check that the variable can be safely declared as a concept.
9364 Note that this also forbids explicit specializations. */
9367 if (!processing_template_decl
)
9369 error_at (declspecs
->locations
[ds_concept
],
9370 "a non-template variable cannot be %<concept%>");
9374 DECL_DECLARED_CONCEPT_P (decl
) = true;
9375 if (!same_type_ignoring_top_level_qualifiers_p (type
, boolean_type_node
))
9376 error_at (declspecs
->locations
[ds_type_spec
],
9377 "concept must have type %<bool%>");
9379 else if (flag_concepts
9380 && processing_template_decl
> template_class_depth (scope
))
9382 tree reqs
= TEMPLATE_PARMS_CONSTRAINTS (current_template_parms
);
9383 tree ci
= build_constraints (reqs
, NULL_TREE
);
9384 set_constraints (decl
, ci
);
9387 // Handle explicit specializations and instantiations of variable templates.
9388 if (orig_declarator
)
9389 decl
= check_explicit_specialization (orig_declarator
, decl
,
9390 template_count
, conceptp
* 8);
9392 return decl
!= error_mark_node
? decl
: NULL_TREE
;
9395 /* Create and return a canonical pointer to member function type, for
9396 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
9399 build_ptrmemfunc_type (tree type
)
9404 if (type
== error_mark_node
)
9407 /* Make sure that we always have the unqualified pointer-to-member
9409 if (cp_cv_quals quals
= cp_type_quals (type
))
9411 tree unqual
= build_ptrmemfunc_type (TYPE_MAIN_VARIANT (type
));
9412 return cp_build_qualified_type (unqual
, quals
);
9415 /* If a canonical type already exists for this type, use it. We use
9416 this method instead of type_hash_canon, because it only does a
9417 simple equality check on the list of field members. */
9419 t
= TYPE_PTRMEMFUNC_TYPE (type
);
9423 t
= make_node (RECORD_TYPE
);
9425 /* Let the front end know this is a pointer to member function. */
9426 TYPE_PTRMEMFUNC_FLAG (t
) = 1;
9428 field
= build_decl (input_location
, FIELD_DECL
, pfn_identifier
, type
);
9431 field
= build_decl (input_location
, FIELD_DECL
, delta_identifier
,
9433 DECL_CHAIN (field
) = fields
;
9436 finish_builtin_struct (t
, "__ptrmemfunc_type", fields
, ptr_type_node
);
9438 /* Zap out the name so that the back end will give us the debugging
9439 information for this anonymous RECORD_TYPE. */
9440 TYPE_NAME (t
) = NULL_TREE
;
9442 /* Cache this pointer-to-member type so that we can find it again
9444 TYPE_PTRMEMFUNC_TYPE (type
) = t
;
9446 if (TYPE_STRUCTURAL_EQUALITY_P (type
))
9447 SET_TYPE_STRUCTURAL_EQUALITY (t
);
9448 else if (TYPE_CANONICAL (type
) != type
)
9449 TYPE_CANONICAL (t
) = build_ptrmemfunc_type (TYPE_CANONICAL (type
));
9454 /* Create and return a pointer to data member type. */
9457 build_ptrmem_type (tree class_type
, tree member_type
)
9459 if (TREE_CODE (member_type
) == METHOD_TYPE
)
9461 cp_cv_quals quals
= type_memfn_quals (member_type
);
9462 cp_ref_qualifier rqual
= type_memfn_rqual (member_type
);
9463 member_type
= build_memfn_type (member_type
, class_type
, quals
, rqual
);
9464 return build_ptrmemfunc_type (build_pointer_type (member_type
));
9468 gcc_assert (TREE_CODE (member_type
) != FUNCTION_TYPE
);
9469 return build_offset_type (class_type
, member_type
);
9473 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
9474 Check to see that the definition is valid. Issue appropriate error
9475 messages. Return 1 if the definition is particularly bad, or 0
9479 check_static_variable_definition (tree decl
, tree type
)
9481 /* Avoid redundant diagnostics on out-of-class definitions. */
9482 if (!current_class_type
|| !TYPE_BEING_DEFINED (current_class_type
))
9484 /* Can't check yet if we don't know the type. */
9485 if (dependent_type_p (type
))
9487 /* If DECL is declared constexpr, we'll do the appropriate checks
9488 in check_initializer. Similarly for inline static data members. */
9490 && (DECL_DECLARED_CONSTEXPR_P (decl
)
9491 || undeduced_auto_decl (decl
)
9492 || DECL_VAR_DECLARED_INLINE_P (decl
)))
9494 else if (cxx_dialect
>= cxx11
&& !INTEGRAL_OR_ENUMERATION_TYPE_P (type
))
9496 if (!COMPLETE_TYPE_P (type
))
9497 error_at (DECL_SOURCE_LOCATION (decl
),
9498 "in-class initialization of static data member %q#D of "
9499 "incomplete type", decl
);
9500 else if (literal_type_p (type
))
9501 permerror (DECL_SOURCE_LOCATION (decl
),
9502 "%<constexpr%> needed for in-class initialization of "
9503 "static data member %q#D of non-integral type", decl
);
9505 error_at (DECL_SOURCE_LOCATION (decl
),
9506 "in-class initialization of static data member %q#D of "
9507 "non-literal type", decl
);
9511 /* Motion 10 at San Diego: If a static const integral data member is
9512 initialized with an integral constant expression, the initializer
9513 may appear either in the declaration (within the class), or in
9514 the definition, but not both. If it appears in the class, the
9515 member is a member constant. The file-scope definition is always
9517 if (!ARITHMETIC_TYPE_P (type
) && TREE_CODE (type
) != ENUMERAL_TYPE
)
9519 error_at (DECL_SOURCE_LOCATION (decl
),
9520 "invalid in-class initialization of static data member "
9521 "of non-integral type %qT",
9525 else if (!CP_TYPE_CONST_P (type
))
9526 error_at (DECL_SOURCE_LOCATION (decl
),
9527 "ISO C++ forbids in-class initialization of non-const "
9528 "static member %qD",
9530 else if (!INTEGRAL_OR_ENUMERATION_TYPE_P (type
))
9531 pedwarn (DECL_SOURCE_LOCATION (decl
), OPT_Wpedantic
,
9532 "ISO C++ forbids initialization of member constant "
9533 "%qD of non-integral type %qT", decl
, type
);
9538 /* *expr_p is part of the TYPE_SIZE of a variably-sized array. If any
9539 SAVE_EXPRs in *expr_p wrap expressions with side-effects, break those
9540 expressions out into temporary variables so that walk_tree doesn't
9541 step into them (c++/15764). */
9544 stabilize_save_expr_r (tree
*expr_p
, int *walk_subtrees
, void *data
)
9546 hash_set
<tree
> *pset
= (hash_set
<tree
> *)data
;
9547 tree expr
= *expr_p
;
9548 if (TREE_CODE (expr
) == SAVE_EXPR
)
9550 tree op
= TREE_OPERAND (expr
, 0);
9551 cp_walk_tree (&op
, stabilize_save_expr_r
, data
, pset
);
9552 if (TREE_SIDE_EFFECTS (op
))
9553 TREE_OPERAND (expr
, 0) = get_temp_regvar (TREE_TYPE (op
), op
);
9556 else if (!EXPR_P (expr
) || !TREE_SIDE_EFFECTS (expr
))
9561 /* Entry point for the above. */
9564 stabilize_vla_size (tree size
)
9566 hash_set
<tree
> pset
;
9567 /* Break out any function calls into temporary variables. */
9568 cp_walk_tree (&size
, stabilize_save_expr_r
, &pset
, &pset
);
9571 /* Reduce a SIZEOF_EXPR to its value. */
9574 fold_sizeof_expr (tree t
)
9577 if (SIZEOF_EXPR_TYPE_P (t
))
9578 r
= cxx_sizeof_or_alignof_type (TREE_TYPE (TREE_OPERAND (t
, 0)),
9579 SIZEOF_EXPR
, false, false);
9580 else if (TYPE_P (TREE_OPERAND (t
, 0)))
9581 r
= cxx_sizeof_or_alignof_type (TREE_OPERAND (t
, 0), SIZEOF_EXPR
,
9584 r
= cxx_sizeof_or_alignof_expr (TREE_OPERAND (t
, 0), SIZEOF_EXPR
,
9586 if (r
== error_mark_node
)
9591 /* Given the SIZE (i.e., number of elements) in an array, compute
9592 an appropriate index type for the array. If non-NULL, NAME is
9593 the name of the entity being declared. */
9596 compute_array_index_type (tree name
, tree size
, tsubst_flags_t complain
)
9601 if (error_operand_p (size
))
9602 return error_mark_node
;
9604 if (!type_dependent_expression_p (size
))
9606 osize
= size
= mark_rvalue_use (size
);
9608 if (cxx_dialect
< cxx11
&& TREE_CODE (size
) == NOP_EXPR
9609 && TREE_SIDE_EFFECTS (size
))
9610 /* In C++98, we mark a non-constant array bound with a magic
9611 NOP_EXPR with TREE_SIDE_EFFECTS; don't fold in that case. */;
9614 size
= instantiate_non_dependent_expr_sfinae (size
, complain
);
9615 size
= build_converted_constant_expr (size_type_node
, size
, complain
);
9616 size
= maybe_constant_value (size
);
9618 if (!TREE_CONSTANT (size
))
9622 if (error_operand_p (size
))
9623 return error_mark_node
;
9625 /* The array bound must be an integer type. */
9626 tree type
= TREE_TYPE (size
);
9627 if (!INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type
))
9629 if (!(complain
& tf_error
))
9630 return error_mark_node
;
9632 error ("size of array %qD has non-integral type %qT", name
, type
);
9634 error ("size of array has non-integral type %qT", type
);
9635 size
= integer_one_node
;
9639 /* A type is dependent if it is...an array type constructed from any
9640 dependent type or whose size is specified by a constant expression
9641 that is value-dependent. */
9642 /* We can only call value_dependent_expression_p on integral constant
9643 expressions; treat non-constant expressions as dependent, too. */
9644 if (processing_template_decl
9645 && (type_dependent_expression_p (size
)
9646 || !TREE_CONSTANT (size
) || value_dependent_expression_p (size
)))
9648 /* We cannot do any checking for a SIZE that isn't known to be
9649 constant. Just build the index type and mark that it requires
9650 structural equality checks. */
9651 itype
= build_index_type (build_min (MINUS_EXPR
, sizetype
,
9652 size
, size_one_node
));
9653 TYPE_DEPENDENT_P (itype
) = 1;
9654 TYPE_DEPENDENT_P_VALID (itype
) = 1;
9655 SET_TYPE_STRUCTURAL_EQUALITY (itype
);
9659 if (TREE_CODE (size
) != INTEGER_CST
)
9661 tree folded
= cp_fully_fold (size
);
9662 if (TREE_CODE (folded
) == INTEGER_CST
)
9663 pedwarn (location_of (size
), OPT_Wpedantic
,
9664 "size of array is not an integral constant-expression");
9665 /* Use the folded result for VLAs, too; it will have resolved
9670 /* Normally, the array-bound will be a constant. */
9671 if (TREE_CODE (size
) == INTEGER_CST
)
9673 /* An array must have a positive number of elements. */
9674 if (!valid_constant_size_p (size
))
9676 if (!(complain
& tf_error
))
9677 return error_mark_node
;
9680 error ("size of array %qD is negative", name
);
9682 error ("size of array is negative");
9683 size
= integer_one_node
;
9685 /* As an extension we allow zero-sized arrays. */
9686 else if (integer_zerop (size
))
9688 if (!(complain
& tf_error
))
9689 /* We must fail if performing argument deduction (as
9690 indicated by the state of complain), so that
9691 another substitution can be found. */
9692 return error_mark_node
;
9693 else if (in_system_header_at (input_location
))
9694 /* Allow them in system headers because glibc uses them. */;
9696 pedwarn (input_location
, OPT_Wpedantic
, "ISO C++ forbids zero-size array %qD", name
);
9698 pedwarn (input_location
, OPT_Wpedantic
, "ISO C++ forbids zero-size array");
9701 else if (TREE_CONSTANT (size
)
9702 /* We don't allow VLAs at non-function scopes, or during
9703 tentative template substitution. */
9704 || !at_function_scope_p ()
9705 || !(complain
& tf_error
))
9707 if (!(complain
& tf_error
))
9708 return error_mark_node
;
9709 /* `(int) &fn' is not a valid array bound. */
9711 error ("size of array %qD is not an integral constant-expression",
9714 error ("size of array is not an integral constant-expression");
9715 size
= integer_one_node
;
9717 else if (pedantic
&& warn_vla
!= 0)
9720 pedwarn (input_location
, OPT_Wvla
, "ISO C++ forbids variable length array %qD", name
);
9722 pedwarn (input_location
, OPT_Wvla
, "ISO C++ forbids variable length array");
9724 else if (warn_vla
> 0)
9728 "variable length array %qD is used", name
);
9731 "variable length array is used");
9734 if (processing_template_decl
&& !TREE_CONSTANT (size
))
9735 /* A variable sized array. */
9736 itype
= build_min (MINUS_EXPR
, sizetype
, size
, integer_one_node
);
9739 /* Compute the index of the largest element in the array. It is
9740 one less than the number of elements in the array. We save
9741 and restore PROCESSING_TEMPLATE_DECL so that computations in
9742 cp_build_binary_op will be appropriately folded. */
9744 processing_template_decl_sentinel s
;
9745 itype
= cp_build_binary_op (input_location
,
9747 cp_convert (ssizetype
, size
, complain
),
9748 cp_convert (ssizetype
, integer_one_node
,
9751 itype
= maybe_constant_value (itype
);
9754 if (!TREE_CONSTANT (itype
))
9756 /* A variable sized array. */
9757 itype
= variable_size (itype
);
9759 stabilize_vla_size (itype
);
9761 if (sanitize_flags_p (SANITIZE_VLA
)
9762 && current_function_decl
!= NULL_TREE
)
9764 /* We have to add 1 -- in the ubsan routine we generate
9765 LE_EXPR rather than LT_EXPR. */
9766 tree t
= fold_build2 (PLUS_EXPR
, TREE_TYPE (itype
), itype
,
9767 build_one_cst (TREE_TYPE (itype
)));
9768 t
= ubsan_instrument_vla (input_location
, t
);
9769 finish_expr_stmt (t
);
9772 /* Make sure that there was no overflow when creating to a signed
9773 index type. (For example, on a 32-bit machine, an array with
9774 size 2^32 - 1 is too big.) */
9775 else if (TREE_CODE (itype
) == INTEGER_CST
9776 && TREE_OVERFLOW (itype
))
9778 if (!(complain
& tf_error
))
9779 return error_mark_node
;
9780 error ("overflow in array dimension");
9781 TREE_OVERFLOW (itype
) = 0;
9785 /* Create and return the appropriate index type. */
9786 itype
= build_index_type (itype
);
9788 /* If the index type were dependent, we would have returned early, so
9789 remember that it isn't. */
9790 TYPE_DEPENDENT_P (itype
) = 0;
9791 TYPE_DEPENDENT_P_VALID (itype
) = 1;
9795 /* Returns the scope (if any) in which the entity declared by
9796 DECLARATOR will be located. If the entity was declared with an
9797 unqualified name, NULL_TREE is returned. */
9800 get_scope_of_declarator (const cp_declarator
*declarator
)
9802 while (declarator
&& declarator
->kind
!= cdk_id
)
9803 declarator
= declarator
->declarator
;
9805 /* If the declarator-id is a SCOPE_REF, the scope in which the
9806 declaration occurs is the first operand. */
9808 && declarator
->u
.id
.qualifying_scope
)
9809 return declarator
->u
.id
.qualifying_scope
;
9811 /* Otherwise, the declarator is not a qualified name; the entity will
9812 be declared in the current scope. */
9816 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
9817 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
9821 create_array_type_for_decl (tree name
, tree type
, tree size
)
9823 tree itype
= NULL_TREE
;
9825 /* If things have already gone awry, bail now. */
9826 if (type
== error_mark_node
|| size
== error_mark_node
)
9827 return error_mark_node
;
9829 /* 8.3.4/1: If the type of the identifier of D contains the auto
9830 type-specifier, the program is ill-formed. */
9831 if (type_uses_auto (type
))
9833 error ("%qD declared as array of %qT", name
, type
);
9834 return error_mark_node
;
9837 /* If there are some types which cannot be array elements,
9838 issue an error-message and return. */
9839 switch (TREE_CODE (type
))
9843 error ("declaration of %qD as array of void", name
);
9845 error ("creating array of void");
9846 return error_mark_node
;
9850 error ("declaration of %qD as array of functions", name
);
9852 error ("creating array of functions");
9853 return error_mark_node
;
9855 case REFERENCE_TYPE
:
9857 error ("declaration of %qD as array of references", name
);
9859 error ("creating array of references");
9860 return error_mark_node
;
9864 error ("declaration of %qD as array of function members", name
);
9866 error ("creating array of function members");
9867 return error_mark_node
;
9875 The constant expressions that specify the bounds of the arrays
9876 can be omitted only for the first member of the sequence. */
9877 if (TREE_CODE (type
) == ARRAY_TYPE
&& !TYPE_DOMAIN (type
))
9880 error ("declaration of %qD as multidimensional array must "
9881 "have bounds for all dimensions except the first",
9884 error ("multidimensional array must have bounds for all "
9885 "dimensions except the first");
9887 return error_mark_node
;
9890 /* Figure out the index type for the array. */
9892 itype
= compute_array_index_type (name
, size
, tf_warning_or_error
);
9895 T is called the array element type; this type shall not be [...] an
9896 abstract class type. */
9897 abstract_virtuals_error (name
, type
);
9899 return build_cplus_array_type (type
, itype
);
9902 /* Returns the smallest location that is not UNKNOWN_LOCATION. */
9905 min_location (location_t loca
, location_t locb
)
9907 if (loca
== UNKNOWN_LOCATION
9908 || (locb
!= UNKNOWN_LOCATION
9909 && linemap_location_before_p (line_table
, locb
, loca
)))
9914 /* Returns the smallest location != UNKNOWN_LOCATION among the
9915 three stored in LOCATIONS[ds_const], LOCATIONS[ds_volatile],
9916 and LOCATIONS[ds_restrict]. */
9919 smallest_type_quals_location (int type_quals
, const location_t
* locations
)
9921 location_t loc
= UNKNOWN_LOCATION
;
9923 if (type_quals
& TYPE_QUAL_CONST
)
9924 loc
= locations
[ds_const
];
9926 if (type_quals
& TYPE_QUAL_VOLATILE
)
9927 loc
= min_location (loc
, locations
[ds_volatile
]);
9929 if (type_quals
& TYPE_QUAL_RESTRICT
)
9930 loc
= min_location (loc
, locations
[ds_restrict
]);
9935 /* Check that it's OK to declare a function with the indicated TYPE
9936 and TYPE_QUALS. SFK indicates the kind of special function (if any)
9937 that this function is. OPTYPE is the type given in a conversion
9938 operator declaration, or the class type for a constructor/destructor.
9939 Returns the actual return type of the function; that may be different
9940 than TYPE if an error occurs, or for certain special functions. */
9943 check_special_function_return_type (special_function_kind sfk
,
9947 const location_t
* locations
)
9951 case sfk_constructor
:
9953 error ("return type specification for constructor invalid");
9954 else if (type_quals
!= TYPE_UNQUALIFIED
)
9955 error_at (smallest_type_quals_location (type_quals
, locations
),
9956 "qualifiers are not allowed on constructor declaration");
9958 if (targetm
.cxx
.cdtor_returns_this ())
9959 type
= build_pointer_type (optype
);
9961 type
= void_type_node
;
9964 case sfk_destructor
:
9966 error ("return type specification for destructor invalid");
9967 else if (type_quals
!= TYPE_UNQUALIFIED
)
9968 error_at (smallest_type_quals_location (type_quals
, locations
),
9969 "qualifiers are not allowed on destructor declaration");
9971 /* We can't use the proper return type here because we run into
9972 problems with ambiguous bases and covariant returns. */
9973 if (targetm
.cxx
.cdtor_returns_this ())
9974 type
= build_pointer_type (void_type_node
);
9976 type
= void_type_node
;
9979 case sfk_conversion
:
9981 error ("return type specified for %<operator %T%>", optype
);
9982 else if (type_quals
!= TYPE_UNQUALIFIED
)
9983 error_at (smallest_type_quals_location (type_quals
, locations
),
9984 "qualifiers are not allowed on declaration of "
9985 "%<operator %T%>", optype
);
9990 case sfk_deduction_guide
:
9992 error ("return type specified for deduction guide");
9993 else if (type_quals
!= TYPE_UNQUALIFIED
)
9994 error_at (smallest_type_quals_location (type_quals
, locations
),
9995 "qualifiers are not allowed on declaration of "
9997 if (TREE_CODE (optype
) == TEMPLATE_TEMPLATE_PARM
)
9999 error ("template template parameter %qT in declaration of "
10000 "deduction guide", optype
);
10001 type
= error_mark_node
;
10004 type
= make_template_placeholder (CLASSTYPE_TI_TEMPLATE (optype
));
10005 for (int i
= 0; i
< ds_last
; ++i
)
10006 if (i
!= ds_explicit
&& locations
[i
])
10007 error_at (locations
[i
],
10008 "decl-specifier in declaration of deduction guide");
10012 gcc_unreachable ();
10018 /* A variable or data member (whose unqualified name is IDENTIFIER)
10019 has been declared with the indicated TYPE. If the TYPE is not
10020 acceptable, issue an error message and return a type to use for
10021 error-recovery purposes. */
10024 check_var_type (tree identifier
, tree type
)
10026 if (VOID_TYPE_P (type
))
10029 error ("unnamed variable or field declared void");
10030 else if (identifier_p (identifier
))
10032 gcc_assert (!IDENTIFIER_ANY_OP_P (identifier
));
10033 error ("variable or field %qE declared void", identifier
);
10036 error ("variable or field declared void");
10037 type
= error_mark_node
;
10043 /* Handle declaring DECL as an inline variable. */
10046 mark_inline_variable (tree decl
, location_t loc
)
10048 bool inlinep
= true;
10049 if (! toplevel_bindings_p ())
10051 error_at (loc
, "%<inline%> specifier invalid for variable "
10052 "%qD declared at block scope", decl
);
10055 else if (cxx_dialect
< cxx17
)
10056 pedwarn (loc
, 0, "inline variables are only available "
10057 "with -std=c++17 or -std=gnu++17");
10060 retrofit_lang_decl (decl
);
10061 SET_DECL_VAR_DECLARED_INLINE_P (decl
);
10066 /* Assign a typedef-given name to a class or enumeration type declared
10067 as anonymous at first. This was split out of grokdeclarator
10068 because it is also used in libcc1. */
10071 name_unnamed_type (tree type
, tree decl
)
10073 gcc_assert (TYPE_UNNAMED_P (type
));
10075 /* Replace the anonymous name with the real name everywhere. */
10076 for (tree t
= TYPE_MAIN_VARIANT (type
); t
; t
= TYPE_NEXT_VARIANT (t
))
10078 if (anon_aggrname_p (TYPE_IDENTIFIER (t
)))
10079 /* We do not rename the debug info representing the
10080 unnamed tagged type because the standard says in
10081 [dcl.typedef] that the naming applies only for
10082 linkage purposes. */
10083 /*debug_hooks->set_name (t, decl);*/
10084 TYPE_NAME (t
) = decl
;
10087 if (TYPE_LANG_SPECIFIC (type
))
10088 TYPE_WAS_UNNAMED (type
) = 1;
10090 /* If this is a typedef within a template class, the nested
10091 type is a (non-primary) template. The name for the
10092 template needs updating as well. */
10093 if (TYPE_LANG_SPECIFIC (type
) && CLASSTYPE_TEMPLATE_INFO (type
))
10094 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type
))
10095 = TYPE_IDENTIFIER (type
);
10097 /* Adjust linkage now that we aren't unnamed anymore. */
10098 reset_type_linkage (type
);
10100 /* FIXME remangle member functions; member functions of a
10101 type with external linkage have external linkage. */
10103 /* Check that our job is done, and that it would fail if we
10104 attempted to do it again. */
10105 gcc_assert (!TYPE_UNNAMED_P (type
));
10108 /* Given declspecs and a declarator (abstract or otherwise), determine
10109 the name and type of the object declared and construct a DECL node
10112 DECLSPECS points to the representation of declaration-specifier
10113 sequence that precedes declarator.
10115 DECL_CONTEXT says which syntactic context this declaration is in:
10116 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
10117 FUNCDEF for a function definition. Like NORMAL but a few different
10118 error messages in each case. Return value may be zero meaning
10119 this definition is too screwy to try to parse.
10120 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
10121 handle member functions (which have FIELD context).
10122 Return value may be zero meaning this definition is too screwy to
10124 PARM for a parameter declaration (either within a function prototype
10125 or before a function body). Make a PARM_DECL, or return void_type_node.
10126 TPARM for a template parameter declaration.
10127 CATCHPARM for a parameter declaration before a catch clause.
10128 TYPENAME if for a typename (in a cast or sizeof).
10129 Don't make a DECL node; just return the ..._TYPE node.
10130 FIELD for a struct or union field; make a FIELD_DECL.
10131 BITFIELD for a field with specified width.
10133 INITIALIZED is as for start_decl.
10135 ATTRLIST is a pointer to the list of attributes, which may be NULL
10136 if there are none; *ATTRLIST may be modified if attributes from inside
10137 the declarator should be applied to the declaration.
10139 When this function is called, scoping variables (such as
10140 CURRENT_CLASS_TYPE) should reflect the scope in which the
10141 declaration occurs, not the scope in which the new declaration will
10142 be placed. For example, on:
10144 void S::f() { ... }
10146 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
10149 Returns a DECL (if a declarator is present), a TYPE (if there is no
10150 declarator, in cases like "struct S;"), or the ERROR_MARK_NODE if an
10154 grokdeclarator (const cp_declarator
*declarator
,
10155 cp_decl_specifier_seq
*declspecs
,
10156 enum decl_context decl_context
,
10160 tree type
= NULL_TREE
;
10162 int explicit_intN
= 0;
10163 int virtualp
, explicitp
, friendp
, inlinep
, staticp
;
10164 int explicit_int
= 0;
10165 int explicit_char
= 0;
10166 int defaulted_int
= 0;
10168 tree typedef_decl
= NULL_TREE
;
10169 const char *name
= NULL
;
10170 tree typedef_type
= NULL_TREE
;
10171 /* True if this declarator is a function definition. */
10172 bool funcdef_flag
= false;
10173 cp_declarator_kind innermost_code
= cdk_error
;
10176 /* See the code below that used this. */
10177 tree decl_attr
= NULL_TREE
;
10180 /* Keep track of what sort of function is being processed
10181 so that we can warn about default return values, or explicit
10182 return values which do not match prescribed defaults. */
10183 special_function_kind sfk
= sfk_none
;
10185 tree dname
= NULL_TREE
;
10186 tree ctor_return_type
= NULL_TREE
;
10187 enum overload_flags flags
= NO_SPECIAL
;
10188 /* cv-qualifiers that apply to the declarator, for a declaration of
10189 a member function. */
10190 cp_cv_quals memfn_quals
= TYPE_UNQUALIFIED
;
10191 /* virt-specifiers that apply to the declarator, for a declaration of
10192 a member function. */
10193 cp_virt_specifiers virt_specifiers
= VIRT_SPEC_UNSPECIFIED
;
10194 /* ref-qualifier that applies to the declarator, for a declaration of
10195 a member function. */
10196 cp_ref_qualifier rqual
= REF_QUAL_NONE
;
10197 /* cv-qualifiers that apply to the type specified by the DECLSPECS. */
10198 int type_quals
= TYPE_UNQUALIFIED
;
10199 tree raises
= NULL_TREE
;
10200 int template_count
= 0;
10201 tree returned_attrs
= NULL_TREE
;
10202 tree parms
= NULL_TREE
;
10203 const cp_declarator
*id_declarator
;
10204 /* The unqualified name of the declarator; either an
10205 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
10206 tree unqualified_id
;
10207 /* The class type, if any, in which this entity is located,
10208 or NULL_TREE if none. Note that this value may be different from
10209 the current class type; for example if an attempt is made to declare
10210 "A::f" inside "B", this value will be "A". */
10211 tree ctype
= current_class_type
;
10212 /* The NAMESPACE_DECL for the namespace in which this entity is
10213 located. If an unqualified name is used to declare the entity,
10214 this value will be NULL_TREE, even if the entity is located at
10215 namespace scope. */
10216 tree in_namespace
= NULL_TREE
;
10217 cp_storage_class storage_class
;
10218 bool unsigned_p
, signed_p
, short_p
, long_p
, thread_p
;
10219 bool type_was_error_mark_node
= false;
10220 bool parameter_pack_p
= declarator
? declarator
->parameter_pack_p
: false;
10221 bool template_type_arg
= false;
10222 bool template_parm_flag
= false;
10223 bool typedef_p
= decl_spec_seq_has_spec_p (declspecs
, ds_typedef
);
10224 bool constexpr_p
= decl_spec_seq_has_spec_p (declspecs
, ds_constexpr
);
10225 bool late_return_type_p
= false;
10226 bool array_parameter_p
= false;
10227 source_location saved_loc
= input_location
;
10228 tree reqs
= NULL_TREE
;
10230 signed_p
= decl_spec_seq_has_spec_p (declspecs
, ds_signed
);
10231 unsigned_p
= decl_spec_seq_has_spec_p (declspecs
, ds_unsigned
);
10232 short_p
= decl_spec_seq_has_spec_p (declspecs
, ds_short
);
10233 long_p
= decl_spec_seq_has_spec_p (declspecs
, ds_long
);
10234 longlong
= decl_spec_seq_has_spec_p (declspecs
, ds_long_long
);
10235 explicit_intN
= declspecs
->explicit_intN_p
;
10236 thread_p
= decl_spec_seq_has_spec_p (declspecs
, ds_thread
);
10238 // Was concept_p specified? Note that ds_concept
10239 // implies ds_constexpr!
10240 bool concept_p
= decl_spec_seq_has_spec_p (declspecs
, ds_concept
);
10242 constexpr_p
= true;
10244 if (decl_spec_seq_has_spec_p (declspecs
, ds_const
))
10245 type_quals
|= TYPE_QUAL_CONST
;
10246 if (decl_spec_seq_has_spec_p (declspecs
, ds_volatile
))
10247 type_quals
|= TYPE_QUAL_VOLATILE
;
10248 if (decl_spec_seq_has_spec_p (declspecs
, ds_restrict
))
10249 type_quals
|= TYPE_QUAL_RESTRICT
;
10251 if (decl_context
== FUNCDEF
)
10252 funcdef_flag
= true, decl_context
= NORMAL
;
10253 else if (decl_context
== MEMFUNCDEF
)
10254 funcdef_flag
= true, decl_context
= FIELD
;
10255 else if (decl_context
== BITFIELD
)
10256 bitfield
= 1, decl_context
= FIELD
;
10257 else if (decl_context
== TEMPLATE_TYPE_ARG
)
10258 template_type_arg
= true, decl_context
= TYPENAME
;
10259 else if (decl_context
== TPARM
)
10260 template_parm_flag
= true, decl_context
= PARM
;
10262 if (initialized
> 1)
10263 funcdef_flag
= true;
10265 location_t typespec_loc
= smallest_type_quals_location (type_quals
,
10266 declspecs
->locations
);
10267 if (typespec_loc
== UNKNOWN_LOCATION
)
10268 typespec_loc
= declspecs
->locations
[ds_type_spec
];
10269 if (typespec_loc
== UNKNOWN_LOCATION
)
10270 typespec_loc
= input_location
;
10272 /* Look inside a declarator for the name being declared
10273 and get it as a string, for an error message. */
10274 for (id_declarator
= declarator
;
10276 id_declarator
= id_declarator
->declarator
)
10278 if (id_declarator
->kind
!= cdk_id
)
10279 innermost_code
= id_declarator
->kind
;
10281 switch (id_declarator
->kind
)
10284 if (id_declarator
->declarator
10285 && id_declarator
->declarator
->kind
== cdk_id
)
10287 sfk
= id_declarator
->declarator
->u
.id
.sfk
;
10288 if (sfk
== sfk_destructor
)
10295 tree qualifying_scope
= id_declarator
->u
.id
.qualifying_scope
;
10296 tree decl
= id_declarator
->u
.id
.unqualified_name
;
10299 if (qualifying_scope
)
10301 if (check_for_bare_parameter_packs (qualifying_scope
,
10302 id_declarator
->id_loc
))
10303 return error_mark_node
;
10304 if (at_function_scope_p ())
10308 A declarator-id shall not be qualified except
10311 None of the cases are permitted in block
10313 if (qualifying_scope
== global_namespace
)
10314 error ("invalid use of qualified-name %<::%D%>",
10316 else if (TYPE_P (qualifying_scope
))
10317 error ("invalid use of qualified-name %<%T::%D%>",
10318 qualifying_scope
, decl
);
10320 error ("invalid use of qualified-name %<%D::%D%>",
10321 qualifying_scope
, decl
);
10322 return error_mark_node
;
10324 else if (TYPE_P (qualifying_scope
))
10326 ctype
= qualifying_scope
;
10327 if (!MAYBE_CLASS_TYPE_P (ctype
))
10329 error ("%q#T is not a class or a namespace", ctype
);
10332 else if (innermost_code
!= cdk_function
10333 && current_class_type
10334 && !uniquely_derived_from_p (ctype
,
10335 current_class_type
))
10337 error ("invalid use of qualified-name %<%T::%D%>",
10338 qualifying_scope
, decl
);
10339 return error_mark_node
;
10342 else if (TREE_CODE (qualifying_scope
) == NAMESPACE_DECL
)
10343 in_namespace
= qualifying_scope
;
10345 switch (TREE_CODE (decl
))
10349 if (innermost_code
!= cdk_function
)
10351 error ("declaration of %qD as non-function", decl
);
10352 return error_mark_node
;
10354 else if (!qualifying_scope
10355 && !(current_class_type
&& at_class_scope_p ()))
10357 error ("declaration of %qD as non-member", decl
);
10358 return error_mark_node
;
10361 tree type
= TREE_OPERAND (decl
, 0);
10363 type
= constructor_name (type
);
10364 name
= identifier_to_locale (IDENTIFIER_POINTER (type
));
10369 case TEMPLATE_ID_EXPR
:
10371 tree fns
= TREE_OPERAND (decl
, 0);
10374 if (!identifier_p (dname
))
10375 dname
= OVL_NAME (dname
);
10377 /* Fall through. */
10379 case IDENTIFIER_NODE
:
10380 if (identifier_p (decl
))
10383 if (IDENTIFIER_KEYWORD_P (dname
))
10385 error ("declarator-id missing; using reserved word %qD",
10387 name
= identifier_to_locale (IDENTIFIER_POINTER (dname
));
10389 else if (!IDENTIFIER_CONV_OP_P (dname
))
10390 name
= identifier_to_locale (IDENTIFIER_POINTER (dname
));
10393 gcc_assert (flags
== NO_SPECIAL
);
10394 flags
= TYPENAME_FLAG
;
10395 sfk
= sfk_conversion
;
10396 tree glob
= get_global_binding (dname
);
10397 if (glob
&& TREE_CODE (glob
) == TYPE_DECL
)
10398 name
= identifier_to_locale (IDENTIFIER_POINTER (dname
));
10400 name
= "<invalid operator>";
10405 gcc_unreachable ();
10412 case cdk_reference
:
10417 name
= "structured binding";
10421 return error_mark_node
;
10424 gcc_unreachable ();
10426 if (id_declarator
->kind
== cdk_id
)
10432 The declarator in a function-definition shall have the form
10433 D1 ( parameter-declaration-clause) ... */
10434 if (funcdef_flag
&& innermost_code
!= cdk_function
)
10436 error ("function definition does not declare parameters");
10437 return error_mark_node
;
10440 if (flags
== TYPENAME_FLAG
10441 && innermost_code
!= cdk_function
10442 && ! (ctype
&& !declspecs
->any_specifiers_p
))
10444 error ("declaration of %qD as non-function", dname
);
10445 return error_mark_node
;
10448 if (dname
&& identifier_p (dname
))
10450 if (UDLIT_OPER_P (dname
)
10451 && innermost_code
!= cdk_function
)
10453 error ("declaration of %qD as non-function", dname
);
10454 return error_mark_node
;
10457 if (IDENTIFIER_ANY_OP_P (dname
))
10461 error ("declaration of %qD as %<typedef%>", dname
);
10462 return error_mark_node
;
10464 else if (decl_context
== PARM
|| decl_context
== CATCHPARM
)
10466 error ("declaration of %qD as parameter", dname
);
10467 return error_mark_node
;
10472 /* Anything declared one level down from the top level
10473 must be one of the parameters of a function
10474 (because the body is at least two levels down). */
10476 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
10477 by not allowing C++ class definitions to specify their parameters
10478 with xdecls (must be spec.d in the parmlist).
10480 Since we now wait to push a class scope until we are sure that
10481 we are in a legitimate method context, we must set oldcname
10482 explicitly (since current_class_name is not yet alive).
10484 We also want to avoid calling this a PARM if it is in a namespace. */
10486 if (decl_context
== NORMAL
&& !toplevel_bindings_p ())
10488 cp_binding_level
*b
= current_binding_level
;
10489 current_binding_level
= b
->level_chain
;
10490 if (current_binding_level
!= 0 && toplevel_bindings_p ())
10491 decl_context
= PARM
;
10492 current_binding_level
= b
;
10496 name
= decl_context
== PARM
? "parameter" : "type name";
10498 if (concept_p
&& typedef_p
)
10500 error_at (declspecs
->locations
[ds_concept
],
10501 "%<concept%> cannot appear in a typedef declaration");
10502 return error_mark_node
;
10505 if (constexpr_p
&& typedef_p
)
10507 error_at (declspecs
->locations
[ds_constexpr
],
10508 "%<constexpr%> cannot appear in a typedef declaration");
10509 return error_mark_node
;
10512 /* If there were multiple types specified in the decl-specifier-seq,
10513 issue an error message. */
10514 if (declspecs
->multiple_types_p
)
10516 error ("two or more data types in declaration of %qs", name
);
10517 return error_mark_node
;
10520 if (declspecs
->conflicting_specifiers_p
)
10522 error ("conflicting specifiers in declaration of %qs", name
);
10523 return error_mark_node
;
10526 /* Extract the basic type from the decl-specifier-seq. */
10527 type
= declspecs
->type
;
10528 if (type
== error_mark_node
)
10531 type_was_error_mark_node
= true;
10533 cp_warn_deprecated_use (type
);
10534 if (type
&& TREE_CODE (type
) == TYPE_DECL
)
10536 typedef_decl
= type
;
10537 type
= TREE_TYPE (typedef_decl
);
10538 if (DECL_ARTIFICIAL (typedef_decl
))
10539 cp_warn_deprecated_use (type
);
10541 /* No type at all: default to `int', and set DEFAULTED_INT
10542 because it was not a user-defined typedef. */
10543 if (type
== NULL_TREE
)
10545 if (signed_p
|| unsigned_p
|| long_p
|| short_p
)
10547 /* These imply 'int'. */
10548 type
= integer_type_node
;
10551 /* If we just have "complex", it is equivalent to "complex double". */
10552 else if (!longlong
&& !explicit_intN
10553 && decl_spec_seq_has_spec_p (declspecs
, ds_complex
))
10555 type
= double_type_node
;
10556 pedwarn (declspecs
->locations
[ds_complex
], OPT_Wpedantic
,
10557 "ISO C++ does not support plain %<complex%> meaning "
10558 "%<double complex%>");
10561 /* Gather flags. */
10562 explicit_int
= declspecs
->explicit_int_p
;
10563 explicit_char
= declspecs
->explicit_char_p
;
10566 /* See the code below that used this. */
10568 decl_attr
= DECL_ATTRIBUTES (typedef_decl
);
10570 typedef_type
= type
;
10572 if (sfk
== sfk_conversion
|| sfk
== sfk_deduction_guide
)
10573 ctor_return_type
= TREE_TYPE (dname
);
10575 ctor_return_type
= ctype
;
10577 if (sfk
!= sfk_none
)
10579 type
= check_special_function_return_type (sfk
, type
,
10582 declspecs
->locations
);
10583 type_quals
= TYPE_UNQUALIFIED
;
10585 else if (type
== NULL_TREE
)
10591 /* We handle `main' specially here, because 'main () { }' is so
10592 common. With no options, it is allowed. With -Wreturn-type,
10593 it is a warning. It is only an error with -pedantic-errors. */
10594 is_main
= (funcdef_flag
10595 && dname
&& identifier_p (dname
)
10596 && MAIN_NAME_P (dname
)
10597 && ctype
== NULL_TREE
10598 && in_namespace
== NULL_TREE
10599 && current_namespace
== global_namespace
);
10601 if (type_was_error_mark_node
)
10602 /* We've already issued an error, don't complain more. */;
10603 else if (in_system_header_at (input_location
) || flag_ms_extensions
)
10604 /* Allow it, sigh. */;
10605 else if (! is_main
)
10606 permerror (input_location
, "ISO C++ forbids declaration of %qs with no type", name
);
10608 pedwarn (input_location
, OPT_Wpedantic
,
10609 "ISO C++ forbids declaration of %qs with no type", name
);
10611 warning (OPT_Wreturn_type
,
10612 "ISO C++ forbids declaration of %qs with no type", name
);
10614 if (type_was_error_mark_node
&& template_parm_flag
)
10615 /* FIXME we should be able to propagate the error_mark_node as is
10616 for other contexts too. */
10617 type
= error_mark_node
;
10619 type
= integer_type_node
;
10626 if (! int_n_enabled_p
[declspecs
->int_n_idx
])
10628 error ("%<__int%d%> is not supported by this target",
10629 int_n_data
[declspecs
->int_n_idx
].bitsize
);
10630 explicit_intN
= false;
10632 else if (pedantic
&& ! in_system_header_at (input_location
))
10633 pedwarn (input_location
, OPT_Wpedantic
,
10634 "ISO C++ does not support %<__int%d%> for %qs",
10635 int_n_data
[declspecs
->int_n_idx
].bitsize
, name
);
10638 /* Now process the modifiers that were specified
10639 and check for invalid combinations. */
10641 /* Long double is a special combination. */
10642 if (long_p
&& !longlong
&& TYPE_MAIN_VARIANT (type
) == double_type_node
)
10645 type
= cp_build_qualified_type (long_double_type_node
,
10646 cp_type_quals (type
));
10649 /* Check all other uses of type modifiers. */
10651 if (unsigned_p
|| signed_p
|| long_p
|| short_p
)
10658 loc
= declspecs
->locations
[ds_unsigned
];
10663 loc
= declspecs
->locations
[ds_signed
];
10668 loc
= declspecs
->locations
[ds_long_long
];
10673 loc
= declspecs
->locations
[ds_long
];
10675 else /* if (short_p) */
10678 loc
= declspecs
->locations
[ds_short
];
10683 if (signed_p
&& unsigned_p
)
10685 gcc_rich_location
richloc (declspecs
->locations
[ds_signed
]);
10686 richloc
.add_range (declspecs
->locations
[ds_unsigned
], false);
10687 error_at (&richloc
,
10688 "%<signed%> and %<unsigned%> specified together");
10690 else if (long_p
&& short_p
)
10692 gcc_rich_location
richloc (declspecs
->locations
[ds_long
]);
10693 richloc
.add_range (declspecs
->locations
[ds_short
], false);
10694 error_at (&richloc
, "%<long%> and %<short%> specified together");
10696 else if (TREE_CODE (type
) != INTEGER_TYPE
10697 || type
== char16_type_node
|| type
== char32_type_node
10698 || ((long_p
|| short_p
)
10699 && (explicit_char
|| explicit_intN
)))
10700 error_at (loc
, "%qs specified with %qT", key
, type
);
10701 else if (!explicit_int
&& !defaulted_int
10702 && !explicit_char
&& !explicit_intN
)
10706 pedwarn (loc
, OPT_Wpedantic
, "%qs specified with %qT",
10708 ok
= !flag_pedantic_errors
;
10710 else if (declspecs
->decltype_p
)
10711 error_at (loc
, "%qs specified with %<decltype%>", key
);
10713 error_at (loc
, "%qs specified with %<typeof%>", key
);
10718 /* Discard the type modifiers if they are invalid. */
10721 unsigned_p
= false;
10729 /* Decide whether an integer type is signed or not.
10730 Optionally treat bitfields as signed by default. */
10734 It is implementation-defined whether a plain (neither
10735 explicitly signed or unsigned) char, short, int, or long
10736 bit-field is signed or unsigned.
10738 Naturally, we extend this to long long as well. Note that
10739 this does not include wchar_t. */
10740 || (bitfield
&& !flag_signed_bitfields
10742 /* A typedef for plain `int' without `signed' can be
10743 controlled just like plain `int', but a typedef for
10744 `signed int' cannot be so controlled. */
10746 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl
))
10747 && TREE_CODE (type
) == INTEGER_TYPE
10748 && !same_type_p (TYPE_MAIN_VARIANT (type
), wchar_type_node
)))
10751 type
= int_n_trees
[declspecs
->int_n_idx
].unsigned_type
;
10753 type
= long_long_unsigned_type_node
;
10755 type
= long_unsigned_type_node
;
10757 type
= short_unsigned_type_node
;
10758 else if (type
== char_type_node
)
10759 type
= unsigned_char_type_node
;
10760 else if (typedef_decl
)
10761 type
= unsigned_type_for (type
);
10763 type
= unsigned_type_node
;
10765 else if (signed_p
&& type
== char_type_node
)
10766 type
= signed_char_type_node
;
10767 else if (explicit_intN
)
10768 type
= int_n_trees
[declspecs
->int_n_idx
].signed_type
;
10770 type
= long_long_integer_type_node
;
10772 type
= long_integer_type_node
;
10774 type
= short_integer_type_node
;
10776 if (decl_spec_seq_has_spec_p (declspecs
, ds_complex
))
10778 if (TREE_CODE (type
) != INTEGER_TYPE
&& TREE_CODE (type
) != REAL_TYPE
)
10779 error ("complex invalid for %qs", name
);
10780 /* If a modifier is specified, the resulting complex is the complex
10781 form of TYPE. E.g, "complex short" is "complex short int". */
10782 else if (type
== integer_type_node
)
10783 type
= complex_integer_type_node
;
10784 else if (type
== float_type_node
)
10785 type
= complex_float_type_node
;
10786 else if (type
== double_type_node
)
10787 type
= complex_double_type_node
;
10788 else if (type
== long_double_type_node
)
10789 type
= complex_long_double_type_node
;
10791 type
= build_complex_type (type
);
10794 /* If we're using the injected-class-name to form a compound type or a
10795 declaration, replace it with the underlying class so we don't get
10796 redundant typedefs in the debug output. But if we are returning the
10797 type unchanged, leave it alone so that it's available to
10798 maybe_get_template_decl_from_type_decl. */
10799 if (CLASS_TYPE_P (type
)
10800 && DECL_SELF_REFERENCE_P (TYPE_NAME (type
))
10801 && type
== TREE_TYPE (TYPE_NAME (type
))
10802 && (declarator
|| type_quals
))
10803 type
= DECL_ORIGINAL_TYPE (TYPE_NAME (type
));
10805 type_quals
|= cp_type_quals (type
);
10806 type
= cp_build_qualified_type_real
10807 (type
, type_quals
, ((((typedef_decl
&& !DECL_ARTIFICIAL (typedef_decl
))
10808 || declspecs
->decltype_p
)
10809 ? tf_ignore_bad_quals
: 0) | tf_warning_or_error
));
10810 /* We might have ignored or rejected some of the qualifiers. */
10811 type_quals
= cp_type_quals (type
);
10813 if (cxx_dialect
>= cxx17
&& type
&& is_auto (type
)
10814 && innermost_code
!= cdk_function
10815 && id_declarator
&& declarator
!= id_declarator
)
10816 if (tree tmpl
= CLASS_PLACEHOLDER_TEMPLATE (type
))
10818 error_at (typespec_loc
, "template placeholder type %qT must be followed "
10819 "by a simple declarator-id", type
);
10820 inform (DECL_SOURCE_LOCATION (tmpl
), "%qD declared here", tmpl
);
10824 inlinep
= decl_spec_seq_has_spec_p (declspecs
, ds_inline
);
10825 virtualp
= decl_spec_seq_has_spec_p (declspecs
, ds_virtual
);
10826 explicitp
= decl_spec_seq_has_spec_p (declspecs
, ds_explicit
);
10828 storage_class
= declspecs
->storage_class
;
10829 if (storage_class
== sc_static
)
10830 staticp
= 1 + (decl_context
== FIELD
);
10836 gcc_rich_location
richloc (declspecs
->locations
[ds_virtual
]);
10837 richloc
.add_range (declspecs
->locations
[ds_storage_class
], false);
10838 error_at (&richloc
, "member %qD cannot be declared both %<virtual%> "
10839 "and %<static%>", dname
);
10840 storage_class
= sc_none
;
10845 gcc_rich_location
richloc (declspecs
->locations
[ds_virtual
]);
10846 richloc
.add_range (declspecs
->locations
[ds_constexpr
], false);
10847 error_at (&richloc
, "member %qD cannot be declared both %<virtual%> "
10848 "and %<constexpr%>", dname
);
10851 friendp
= decl_spec_seq_has_spec_p (declspecs
, ds_friend
);
10853 /* Issue errors about use of storage classes for parameters. */
10854 if (decl_context
== PARM
)
10858 error_at (declspecs
->locations
[ds_typedef
],
10859 "typedef declaration invalid in parameter declaration");
10860 return error_mark_node
;
10862 else if (template_parm_flag
&& storage_class
!= sc_none
)
10864 error_at (min_location (declspecs
->locations
[ds_thread
],
10865 declspecs
->locations
[ds_storage_class
]),
10866 "storage class specified for template parameter %qs",
10868 return error_mark_node
;
10870 else if (storage_class
== sc_static
10871 || storage_class
== sc_extern
10874 error_at (min_location (declspecs
->locations
[ds_thread
],
10875 declspecs
->locations
[ds_storage_class
]),
10876 "storage class specified for parameter %qs", name
);
10877 return error_mark_node
;
10880 /* Function parameters cannot be concept. */
10882 error_at (declspecs
->locations
[ds_concept
],
10883 "a parameter cannot be declared %<concept%>");
10884 /* Function parameters cannot be constexpr. If we saw one, moan
10885 and pretend it wasn't there. */
10886 else if (constexpr_p
)
10888 error_at (declspecs
->locations
[ds_constexpr
],
10889 "a parameter cannot be declared %<constexpr%>");
10894 /* Give error if `virtual' is used outside of class declaration. */
10896 && (current_class_name
== NULL_TREE
|| decl_context
!= FIELD
))
10898 error_at (declspecs
->locations
[ds_virtual
],
10899 "%<virtual%> outside class declaration");
10903 if (innermost_code
== cdk_decomp
)
10905 location_t loc
= (declarator
->kind
== cdk_reference
10906 ? declarator
->declarator
->id_loc
: declarator
->id_loc
);
10908 error_at (declspecs
->locations
[ds_inline
],
10909 "structured binding declaration cannot be %<inline%>");
10911 error_at (declspecs
->locations
[ds_typedef
],
10912 "structured binding declaration cannot be %<typedef%>");
10914 error_at (declspecs
->locations
[ds_constexpr
], "structured "
10915 "binding declaration cannot be %<constexpr%>");
10917 error_at (declspecs
->locations
[ds_thread
],
10918 "structured binding declaration cannot be %qs",
10919 declspecs
->gnu_thread_keyword_p
10920 ? "__thread" : "thread_local");
10922 error_at (declspecs
->locations
[ds_concept
],
10923 "structured binding declaration cannot be %<concept%>");
10924 switch (storage_class
)
10929 error_at (loc
, "structured binding declaration cannot be "
10933 error_at (loc
, "structured binding declaration cannot be "
10937 error_at (loc
, "structured binding declaration cannot be "
10941 error_at (loc
, "structured binding declaration cannot be "
10945 error_at (loc
, "structured binding declaration cannot be "
10949 gcc_unreachable ();
10951 if (TREE_CODE (type
) != TEMPLATE_TYPE_PARM
10952 || TYPE_IDENTIFIER (type
) != auto_identifier
)
10954 if (type
!= error_mark_node
)
10956 error_at (loc
, "structured binding declaration cannot have "
10959 "type must be cv-qualified %<auto%> or reference to "
10960 "cv-qualified %<auto%>");
10962 type
= build_qualified_type (make_auto (), type_quals
);
10963 declspecs
->type
= type
;
10970 storage_class
= sc_none
;
10972 declspecs
->storage_class
= sc_none
;
10973 declspecs
->locations
[ds_thread
] = UNKNOWN_LOCATION
;
10976 /* Static anonymous unions are dealt with here. */
10977 if (staticp
&& decl_context
== TYPENAME
10979 && ANON_AGGR_TYPE_P (declspecs
->type
))
10980 decl_context
= FIELD
;
10982 /* Warn about storage classes that are invalid for certain
10983 kinds of declarations (parameters, typenames, etc.). */
10986 && storage_class
!= sc_extern
10987 && storage_class
!= sc_static
)
10990 error ("multiple storage classes in declaration of %qs", name
);
10993 if (decl_context
!= NORMAL
10994 && ((storage_class
!= sc_none
10995 && storage_class
!= sc_mutable
)
10998 if ((decl_context
== PARM
|| decl_context
== CATCHPARM
)
10999 && (storage_class
== sc_register
11000 || storage_class
== sc_auto
))
11002 else if (typedef_p
)
11004 else if (decl_context
== FIELD
11005 /* C++ allows static class elements. */
11006 && storage_class
== sc_static
)
11007 /* C++ also allows inlines and signed and unsigned elements,
11008 but in those cases we don't come in here. */
11013 = min_location (declspecs
->locations
[ds_thread
],
11014 declspecs
->locations
[ds_storage_class
]);
11015 if (decl_context
== FIELD
)
11016 error_at (loc
, "storage class specified for %qs", name
);
11017 else if (decl_context
== PARM
|| decl_context
== CATCHPARM
)
11018 error_at (loc
, "storage class specified for parameter %qs", name
);
11020 error_at (loc
, "storage class specified for typename");
11021 if (storage_class
== sc_register
11022 || storage_class
== sc_auto
11023 || storage_class
== sc_extern
11025 storage_class
= sc_none
;
11028 else if (storage_class
== sc_extern
&& funcdef_flag
11029 && ! toplevel_bindings_p ())
11030 error ("nested function %qs declared %<extern%>", name
);
11031 else if (toplevel_bindings_p ())
11033 if (storage_class
== sc_auto
)
11034 error ("top-level declaration of %qs specifies %<auto%>", name
);
11037 && storage_class
!= sc_extern
11038 && storage_class
!= sc_static
)
11040 if (declspecs
->gnu_thread_keyword_p
)
11041 pedwarn (declspecs
->locations
[ds_thread
],
11042 0, "function-scope %qs implicitly auto and "
11043 "declared %<__thread%>", name
);
11045 /* When thread_local is applied to a variable of block scope the
11046 storage-class-specifier static is implied if it does not appear
11048 storage_class
= declspecs
->storage_class
= sc_static
;
11052 if (storage_class
&& friendp
)
11054 error_at (min_location (declspecs
->locations
[ds_thread
],
11055 declspecs
->locations
[ds_storage_class
]),
11056 "storage class specifiers invalid in friend function "
11058 storage_class
= sc_none
;
11062 if (!id_declarator
)
11063 unqualified_id
= NULL_TREE
;
11066 unqualified_id
= id_declarator
->u
.id
.unqualified_name
;
11067 switch (TREE_CODE (unqualified_id
))
11070 unqualified_id
= TREE_OPERAND (unqualified_id
, 0);
11071 if (TYPE_P (unqualified_id
))
11072 unqualified_id
= constructor_name (unqualified_id
);
11075 case IDENTIFIER_NODE
:
11076 case TEMPLATE_ID_EXPR
:
11080 gcc_unreachable ();
11084 if (declspecs
->std_attributes
)
11086 location_t attr_loc
= declspecs
->locations
[ds_std_attribute
];
11087 if (warning_at (attr_loc
, OPT_Wattributes
, "attribute ignored"))
11088 inform (attr_loc
, "an attribute that appertains to a type-specifier "
11092 /* Determine the type of the entity declared by recurring on the
11094 for (; declarator
; declarator
= declarator
->declarator
)
11096 const cp_declarator
*inner_declarator
;
11099 if (type
== error_mark_node
)
11100 return error_mark_node
;
11102 attrs
= declarator
->attributes
;
11108 if (declarator
== NULL
|| declarator
->kind
== cdk_id
)
11109 attr_flags
|= (int) ATTR_FLAG_DECL_NEXT
;
11110 if (declarator
->kind
== cdk_function
)
11111 attr_flags
|= (int) ATTR_FLAG_FUNCTION_NEXT
;
11112 if (declarator
->kind
== cdk_array
)
11113 attr_flags
|= (int) ATTR_FLAG_ARRAY_NEXT
;
11114 returned_attrs
= decl_attributes (&type
,
11115 chainon (returned_attrs
, attrs
),
11119 inner_declarator
= declarator
->declarator
;
11121 /* We don't want to warn in parameter context because we don't
11122 yet know if the parse will succeed, and this might turn out
11123 to be a constructor call. */
11124 if (decl_context
!= PARM
11125 && decl_context
!= TYPENAME
11127 && declarator
->parenthesized
!= UNKNOWN_LOCATION
11128 /* If the type is class-like and the inner name used a
11129 global namespace qualifier, we need the parens.
11130 Unfortunately all we can tell is whether a qualified name
11131 was used or not. */
11132 && !(inner_declarator
11133 && inner_declarator
->kind
== cdk_id
11134 && inner_declarator
->u
.id
.qualifying_scope
11135 && (MAYBE_CLASS_TYPE_P (type
)
11136 || TREE_CODE (type
) == ENUMERAL_TYPE
)))
11137 warning_at (declarator
->parenthesized
, OPT_Wparentheses
,
11138 "unnecessary parentheses in declaration of %qs", name
);
11139 if (declarator
->kind
== cdk_id
|| declarator
->kind
== cdk_decomp
)
11142 switch (declarator
->kind
)
11145 type
= create_array_type_for_decl (dname
, type
,
11146 declarator
->u
.array
.bounds
);
11147 if (!valid_array_size_p (input_location
, type
, dname
))
11148 type
= error_mark_node
;
11150 if (declarator
->std_attributes
)
11153 The optional attribute-specifier-seq appertains to the
11155 returned_attrs
= chainon (returned_attrs
,
11156 declarator
->std_attributes
);
11164 /* Declaring a function type. */
11166 input_location
= declspecs
->locations
[ds_type_spec
];
11167 abstract_virtuals_error (ACU_RETURN
, type
);
11168 input_location
= saved_loc
;
11170 /* Pick up type qualifiers which should be applied to `this'. */
11171 memfn_quals
= declarator
->u
.function
.qualifiers
;
11172 /* Pick up virt-specifiers. */
11173 virt_specifiers
= declarator
->u
.function
.virt_specifiers
;
11174 /* And ref-qualifier, too */
11175 rqual
= declarator
->u
.function
.ref_qualifier
;
11176 /* And tx-qualifier. */
11177 tree tx_qual
= declarator
->u
.function
.tx_qualifier
;
11178 /* Pick up the exception specifications. */
11179 raises
= declarator
->u
.function
.exception_specification
;
11180 /* If the exception-specification is ill-formed, let's pretend
11181 there wasn't one. */
11182 if (raises
== error_mark_node
)
11183 raises
= NULL_TREE
;
11186 error_at (location_of (reqs
), "requires-clause on return type");
11187 reqs
= declarator
->u
.function
.requires_clause
;
11189 /* Say it's a definition only for the CALL_EXPR
11190 closest to the identifier. */
11191 funcdecl_p
= inner_declarator
&& inner_declarator
->kind
== cdk_id
;
11193 /* Handle a late-specified return type. */
11194 tree late_return_type
= declarator
->u
.function
.late_return_type
;
11197 if (tree auto_node
= type_uses_auto (type
))
11199 if (!late_return_type
)
11201 if (current_class_type
11202 && LAMBDA_TYPE_P (current_class_type
))
11203 /* OK for C++11 lambdas. */;
11204 else if (cxx_dialect
< cxx14
)
11206 error ("%qs function uses "
11207 "%<auto%> type specifier without trailing "
11208 "return type", name
);
11209 inform (input_location
, "deduced return type "
11210 "only available with -std=c++14 or "
11215 error ("virtual function cannot "
11216 "have deduced return type");
11220 else if (!is_auto (type
) && sfk
!= sfk_conversion
)
11222 error ("%qs function with trailing return type has"
11223 " %qT as its type rather than plain %<auto%>",
11225 return error_mark_node
;
11227 tree tmpl
= CLASS_PLACEHOLDER_TEMPLATE (auto_node
);
11229 if (tree late_auto
= type_uses_auto (late_return_type
))
11230 tmpl
= CLASS_PLACEHOLDER_TEMPLATE (late_auto
);
11233 if (!dguide_name_p (unqualified_id
))
11235 error_at (declarator
->id_loc
, "deduced class "
11236 "type %qD in function return type",
11238 inform (DECL_SOURCE_LOCATION (tmpl
),
11239 "%qD declared here", tmpl
);
11240 return error_mark_node
;
11242 else if (!late_return_type
)
11244 error_at (declarator
->id_loc
, "deduction guide "
11245 "for %qT must have trailing return "
11246 "type", TREE_TYPE (tmpl
));
11247 inform (DECL_SOURCE_LOCATION (tmpl
),
11248 "%qD declared here", tmpl
);
11249 return error_mark_node
;
11251 else if (CLASS_TYPE_P (late_return_type
)
11252 && CLASSTYPE_TEMPLATE_INFO (late_return_type
)
11253 && (CLASSTYPE_TI_TEMPLATE (late_return_type
)
11257 error ("trailing return type %qT of deduction guide "
11258 "is not a specialization of %qT",
11259 late_return_type
, TREE_TYPE (tmpl
));
11262 else if (late_return_type
11263 && sfk
!= sfk_conversion
)
11265 if (cxx_dialect
< cxx11
)
11266 /* Not using maybe_warn_cpp0x because this should
11267 always be an error. */
11268 error ("trailing return type only available with "
11269 "-std=c++11 or -std=gnu++11");
11271 error ("%qs function with trailing return type not "
11272 "declared with %<auto%> type specifier", name
);
11273 return error_mark_node
;
11276 type
= splice_late_return_type (type
, late_return_type
);
11277 if (type
== error_mark_node
)
11278 return error_mark_node
;
11280 if (late_return_type
)
11282 late_return_type_p
= true;
11283 type_quals
= cp_type_quals (type
);
11286 if (type_quals
!= TYPE_UNQUALIFIED
)
11288 if (SCALAR_TYPE_P (type
) || VOID_TYPE_P (type
))
11289 warning_at (typespec_loc
, OPT_Wignored_qualifiers
, "type "
11290 "qualifiers ignored on function return type");
11291 /* We now know that the TYPE_QUALS don't apply to the
11292 decl, but to its return type. */
11293 type_quals
= TYPE_UNQUALIFIED
;
11296 /* Error about some types functions can't return. */
11298 if (TREE_CODE (type
) == FUNCTION_TYPE
)
11300 error_at (typespec_loc
, "%qs declared as function returning "
11301 "a function", name
);
11302 return error_mark_node
;
11304 if (TREE_CODE (type
) == ARRAY_TYPE
)
11306 error_at (typespec_loc
, "%qs declared as function returning "
11308 return error_mark_node
;
11311 if (ctype
== NULL_TREE
11312 && decl_context
== FIELD
11315 ctype
= current_class_type
;
11317 if (ctype
&& (sfk
== sfk_constructor
11318 || sfk
== sfk_destructor
))
11320 /* We are within a class's scope. If our declarator name
11321 is the same as the class name, and we are defining
11322 a function, then it is a constructor/destructor, and
11323 therefore returns a void type. */
11325 /* ISO C++ 12.4/2. A destructor may not be declared
11326 const or volatile. A destructor may not be static.
11327 A destructor may not be declared with ref-qualifier.
11329 ISO C++ 12.1. A constructor may not be declared
11330 const or volatile. A constructor may not be
11331 virtual. A constructor may not be static.
11332 A constructor may not be declared with ref-qualifier. */
11334 error ((flags
== DTOR_FLAG
)
11335 ? G_("destructor cannot be static member function")
11336 : G_("constructor cannot be static member function"));
11339 error ((flags
== DTOR_FLAG
)
11340 ? G_("destructors may not be cv-qualified")
11341 : G_("constructors may not be cv-qualified"));
11342 memfn_quals
= TYPE_UNQUALIFIED
;
11347 maybe_warn_cpp0x (CPP0X_REF_QUALIFIER
);
11348 error ((flags
== DTOR_FLAG
)
11349 ? G_("destructors may not be ref-qualified")
11350 : G_("constructors may not be ref-qualified"));
11351 rqual
= REF_QUAL_NONE
;
11354 if (decl_context
== FIELD
11355 && !member_function_or_else (ctype
,
11356 current_class_type
,
11358 return error_mark_node
;
11360 if (flags
!= DTOR_FLAG
)
11362 /* It's a constructor. */
11363 if (explicitp
== 1)
11367 permerror (declspecs
->locations
[ds_virtual
],
11368 "constructors cannot be declared %<virtual%>");
11371 if (decl_context
== FIELD
11372 && sfk
!= sfk_constructor
)
11373 return error_mark_node
;
11375 if (decl_context
== FIELD
)
11382 /* Cannot be both friend and virtual. */
11383 gcc_rich_location
richloc (declspecs
->locations
[ds_virtual
]);
11384 richloc
.add_range (declspecs
->locations
[ds_friend
], false);
11385 error_at (&richloc
, "virtual functions cannot be friends");
11388 if (decl_context
== NORMAL
)
11389 error ("friend declaration not in class definition");
11390 if (current_function_decl
&& funcdef_flag
)
11392 error ("can%'t define friend function %qs in a local "
11393 "class definition", name
);
11397 else if (ctype
&& sfk
== sfk_conversion
)
11399 if (explicitp
== 1)
11401 maybe_warn_cpp0x (CPP0X_EXPLICIT_CONVERSION
);
11404 if (late_return_type_p
)
11405 error ("a conversion function cannot have a trailing return type");
11407 else if (sfk
== sfk_deduction_guide
)
11409 if (explicitp
== 1)
11413 tree pushed_scope
= NULL_TREE
;
11415 && decl_context
!= FIELD
11416 && inner_declarator
->u
.id
.qualifying_scope
11417 && CLASS_TYPE_P (inner_declarator
->u
.id
.qualifying_scope
))
11419 = push_scope (inner_declarator
->u
.id
.qualifying_scope
);
11421 arg_types
= grokparms (declarator
->u
.function
.parameters
, &parms
);
11424 pop_scope (pushed_scope
);
11426 if (inner_declarator
11427 && inner_declarator
->kind
== cdk_id
11428 && inner_declarator
->u
.id
.sfk
== sfk_destructor
11429 && arg_types
!= void_list_node
)
11431 error ("destructors may not have parameters");
11432 arg_types
= void_list_node
;
11436 type
= build_function_type (type
, arg_types
);
11438 tree attrs
= declarator
->std_attributes
;
11441 tree att
= build_tree_list (tx_qual
, NULL_TREE
);
11442 /* transaction_safe applies to the type, but
11443 transaction_safe_dynamic applies to the function. */
11444 if (is_attribute_p ("transaction_safe", tx_qual
))
11445 attrs
= chainon (attrs
, att
);
11447 returned_attrs
= chainon (returned_attrs
, att
);
11452 The optional attribute-specifier-seq appertains to
11453 the function type. */
11454 decl_attributes (&type
, attrs
, 0);
11457 type
= build_exception_variant (type
, raises
);
11462 case cdk_reference
:
11464 /* Filter out pointers-to-references and references-to-references.
11465 We can get these if a TYPE_DECL is used. */
11467 if (TYPE_REF_P (type
))
11469 if (declarator
->kind
!= cdk_reference
)
11471 error ("cannot declare pointer to %q#T", type
);
11472 type
= TREE_TYPE (type
);
11475 /* In C++0x, we allow reference to reference declarations
11476 that occur indirectly through typedefs [7.1.3/8 dcl.typedef]
11477 and template type arguments [14.3.1/4 temp.arg.type]. The
11478 check for direct reference to reference declarations, which
11479 are still forbidden, occurs below. Reasoning behind the change
11480 can be found in DR106, DR540, and the rvalue reference
11482 else if (cxx_dialect
== cxx98
)
11484 error ("cannot declare reference to %q#T", type
);
11485 type
= TREE_TYPE (type
);
11488 else if (VOID_TYPE_P (type
))
11490 if (declarator
->kind
== cdk_reference
)
11491 error ("cannot declare reference to %q#T", type
);
11492 else if (declarator
->kind
== cdk_ptrmem
)
11493 error ("cannot declare pointer to %q#T member", type
);
11496 /* We now know that the TYPE_QUALS don't apply to the decl,
11497 but to the target of the pointer. */
11498 type_quals
= TYPE_UNQUALIFIED
;
11500 /* This code used to handle METHOD_TYPE, but I don't think it's
11501 possible to get it here anymore. */
11502 gcc_assert (TREE_CODE (type
) != METHOD_TYPE
);
11503 if (declarator
->kind
== cdk_ptrmem
11504 && TREE_CODE (type
) == FUNCTION_TYPE
)
11506 memfn_quals
|= type_memfn_quals (type
);
11507 type
= build_memfn_type (type
,
11508 declarator
->u
.pointer
.class_type
,
11511 if (type
== error_mark_node
)
11512 return error_mark_node
;
11514 rqual
= REF_QUAL_NONE
;
11515 memfn_quals
= TYPE_UNQUALIFIED
;
11518 if (TREE_CODE (type
) == FUNCTION_TYPE
11519 && (type_memfn_quals (type
) != TYPE_UNQUALIFIED
11520 || type_memfn_rqual (type
) != REF_QUAL_NONE
))
11521 error (declarator
->kind
== cdk_reference
11522 ? G_("cannot declare reference to qualified function type %qT")
11523 : G_("cannot declare pointer to qualified function type %qT"),
11526 /* When the pointed-to type involves components of variable size,
11527 care must be taken to ensure that the size evaluation code is
11528 emitted early enough to dominate all the possible later uses
11529 and late enough for the variables on which it depends to have
11532 This is expected to happen automatically when the pointed-to
11533 type has a name/declaration of it's own, but special attention
11534 is required if the type is anonymous.
11536 We handle the NORMAL and FIELD contexts here by inserting a
11537 dummy statement that just evaluates the size at a safe point
11538 and ensures it is not deferred until e.g. within a deeper
11539 conditional context (c++/43555).
11541 We expect nothing to be needed here for PARM or TYPENAME.
11542 Evaluating the size at this point for TYPENAME would
11543 actually be incorrect, as we might be in the middle of an
11544 expression with side effects on the pointed-to type size
11545 "arguments" prior to the pointer declaration point and the
11546 size evaluation could end up prior to the side effects. */
11548 if (!TYPE_NAME (type
)
11549 && (decl_context
== NORMAL
|| decl_context
== FIELD
)
11550 && at_function_scope_p ()
11551 && variably_modified_type_p (type
, NULL_TREE
))
11553 TYPE_NAME (type
) = build_decl (UNKNOWN_LOCATION
, TYPE_DECL
,
11555 add_decl_expr (TYPE_NAME (type
));
11558 if (declarator
->kind
== cdk_reference
)
11560 /* In C++0x, the type we are creating a reference to might be
11561 a typedef which is itself a reference type. In that case,
11562 we follow the reference collapsing rules in
11563 [7.1.3/8 dcl.typedef] to create the final reference type:
11565 "If a typedef TD names a type that is a reference to a type
11566 T, an attempt to create the type 'lvalue reference to cv TD'
11567 creates the type 'lvalue reference to T,' while an attempt
11568 to create the type "rvalue reference to cv TD' creates the
11571 if (VOID_TYPE_P (type
))
11572 /* We already gave an error. */;
11573 else if (TYPE_REF_P (type
))
11575 if (declarator
->u
.reference
.rvalue_ref
)
11576 /* Leave type alone. */;
11578 type
= cp_build_reference_type (TREE_TYPE (type
), false);
11581 type
= cp_build_reference_type
11582 (type
, declarator
->u
.reference
.rvalue_ref
);
11584 /* In C++0x, we need this check for direct reference to
11585 reference declarations, which are forbidden by
11586 [8.3.2/5 dcl.ref]. Reference to reference declarations
11587 are only allowed indirectly through typedefs and template
11588 type arguments. Example:
11590 void foo(int & &); // invalid ref-to-ref decl
11592 typedef int & int_ref;
11593 void foo(int_ref &); // valid ref-to-ref decl
11595 if (inner_declarator
&& inner_declarator
->kind
== cdk_reference
)
11596 error ("cannot declare reference to %q#T, which is not "
11597 "a typedef or a template type argument", type
);
11599 else if (TREE_CODE (type
) == METHOD_TYPE
)
11600 type
= build_ptrmemfunc_type (build_pointer_type (type
));
11601 else if (declarator
->kind
== cdk_ptrmem
)
11603 gcc_assert (TREE_CODE (declarator
->u
.pointer
.class_type
)
11604 != NAMESPACE_DECL
);
11605 if (declarator
->u
.pointer
.class_type
== error_mark_node
)
11606 /* We will already have complained. */
11607 type
= error_mark_node
;
11609 type
= build_ptrmem_type (declarator
->u
.pointer
.class_type
,
11613 type
= build_pointer_type (type
);
11615 /* Process a list of type modifier keywords (such as
11616 const or volatile) that were given inside the `*' or `&'. */
11618 if (declarator
->u
.pointer
.qualifiers
)
11621 = cp_build_qualified_type (type
,
11622 declarator
->u
.pointer
.qualifiers
);
11623 type_quals
= cp_type_quals (type
);
11626 /* Apply C++11 attributes to the pointer, and not to the
11627 type pointed to. This is unlike what is done for GNU
11628 attributes above. It is to comply with [dcl.ptr]/1:
11630 [the optional attribute-specifier-seq (7.6.1) appertains
11631 to the pointer and not to the object pointed to]. */
11632 if (declarator
->std_attributes
)
11633 decl_attributes (&type
, declarator
->std_attributes
,
11643 gcc_unreachable ();
11647 /* A `constexpr' specifier used in an object declaration declares
11648 the object as `const'. */
11649 if (constexpr_p
&& innermost_code
!= cdk_function
)
11651 /* DR1688 says that a `constexpr' specifier in combination with
11652 `volatile' is valid. */
11654 if (!TYPE_REF_P (type
))
11656 type_quals
|= TYPE_QUAL_CONST
;
11657 type
= cp_build_qualified_type (type
, type_quals
);
11661 if (unqualified_id
&& TREE_CODE (unqualified_id
) == TEMPLATE_ID_EXPR
11662 && TREE_CODE (type
) != FUNCTION_TYPE
11663 && TREE_CODE (type
) != METHOD_TYPE
11664 && !variable_template_p (TREE_OPERAND (unqualified_id
, 0)))
11666 error ("template-id %qD used as a declarator",
11668 unqualified_id
= dname
;
11671 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
11672 qualified with a class-name, turn it into a METHOD_TYPE, unless
11673 we know that the function is static. We take advantage of this
11674 opportunity to do other processing that pertains to entities
11675 explicitly declared to be class members. Note that if DECLARATOR
11676 is non-NULL, we know it is a cdk_id declarator; otherwise, we
11677 would not have exited the loop above. */
11679 && declarator
->kind
== cdk_id
11680 && declarator
->u
.id
.qualifying_scope
11681 && MAYBE_CLASS_TYPE_P (declarator
->u
.id
.qualifying_scope
))
11683 ctype
= declarator
->u
.id
.qualifying_scope
;
11684 ctype
= TYPE_MAIN_VARIANT (ctype
);
11685 template_count
= num_template_headers_for_class (ctype
);
11687 if (ctype
== current_class_type
)
11691 permerror (input_location
, "member functions are implicitly "
11692 "friends of their class");
11696 permerror (declarator
->id_loc
,
11697 "extra qualification %<%T::%> on member %qs",
11700 else if (/* If the qualifying type is already complete, then we
11701 can skip the following checks. */
11702 !COMPLETE_TYPE_P (ctype
)
11703 && (/* If the function is being defined, then
11704 qualifying type must certainly be complete. */
11706 /* A friend declaration of "T::f" is OK, even if
11707 "T" is a template parameter. But, if this
11708 function is not a friend, the qualifying type
11709 must be a class. */
11710 || (!friendp
&& !CLASS_TYPE_P (ctype
))
11711 /* For a declaration, the type need not be
11712 complete, if either it is dependent (since there
11713 is no meaningful definition of complete in that
11714 case) or the qualifying class is currently being
11716 || !(dependent_type_p (ctype
)
11717 || currently_open_class (ctype
)))
11718 /* Check that the qualifying type is complete. */
11719 && !complete_type_or_else (ctype
, NULL_TREE
))
11720 return error_mark_node
;
11721 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
11723 if (current_class_type
11724 && (!friendp
|| funcdef_flag
|| initialized
))
11726 error (funcdef_flag
|| initialized
11727 ? G_("cannot define member function %<%T::%s%> "
11729 : G_("cannot declare member function %<%T::%s%> "
11731 ctype
, name
, current_class_type
);
11732 return error_mark_node
;
11735 else if (typedef_p
&& current_class_type
)
11737 error ("cannot declare member %<%T::%s%> within %qT",
11738 ctype
, name
, current_class_type
);
11739 return error_mark_node
;
11743 if (ctype
== NULL_TREE
&& decl_context
== FIELD
&& friendp
== 0)
11744 ctype
= current_class_type
;
11746 /* Now TYPE has the actual type. */
11748 if (returned_attrs
)
11751 *attrlist
= chainon (returned_attrs
, *attrlist
);
11753 attrlist
= &returned_attrs
;
11757 && declarator
->kind
== cdk_id
11758 && declarator
->std_attributes
11759 && attrlist
!= NULL
)
11761 /* [dcl.meaning]/1: The optional attribute-specifier-seq following
11762 a declarator-id appertains to the entity that is declared. */
11763 if (declarator
->std_attributes
!= error_mark_node
)
11764 *attrlist
= chainon (*attrlist
, declarator
->std_attributes
);
11766 /* We should have already diagnosed the issue (c++/78344). */
11767 gcc_assert (seen_error ());
11770 /* Handle parameter packs. */
11771 if (parameter_pack_p
)
11773 if (decl_context
== PARM
)
11774 /* Turn the type into a pack expansion.*/
11775 type
= make_pack_expansion (type
);
11777 error ("non-parameter %qs cannot be a parameter pack", name
);
11780 if ((decl_context
== FIELD
|| decl_context
== PARM
)
11781 && !processing_template_decl
11782 && variably_modified_type_p (type
, NULL_TREE
))
11784 if (decl_context
== FIELD
)
11785 error ("data member may not have variably modified type %qT", type
);
11787 error ("parameter may not have variably modified type %qT", type
);
11788 type
= error_mark_node
;
11791 if (explicitp
== 1 || (explicitp
&& friendp
))
11793 /* [dcl.fct.spec] (C++11) The explicit specifier shall be used only
11794 in the declaration of a constructor or conversion function within
11795 a class definition. */
11796 if (!current_class_type
)
11797 error_at (declspecs
->locations
[ds_explicit
],
11798 "%<explicit%> outside class declaration");
11800 error_at (declspecs
->locations
[ds_explicit
],
11801 "%<explicit%> in friend declaration");
11803 error_at (declspecs
->locations
[ds_explicit
],
11804 "only declarations of constructors and conversion operators "
11805 "can be %<explicit%>");
11809 if (storage_class
== sc_mutable
)
11811 if (decl_context
!= FIELD
|| friendp
)
11813 error ("non-member %qs cannot be declared %<mutable%>", name
);
11814 storage_class
= sc_none
;
11816 else if (decl_context
== TYPENAME
|| typedef_p
)
11818 error ("non-object member %qs cannot be declared %<mutable%>", name
);
11819 storage_class
= sc_none
;
11821 else if (TREE_CODE (type
) == FUNCTION_TYPE
11822 || TREE_CODE (type
) == METHOD_TYPE
)
11824 error ("function %qs cannot be declared %<mutable%>", name
);
11825 storage_class
= sc_none
;
11829 error ("static %qs cannot be declared %<mutable%>", name
);
11830 storage_class
= sc_none
;
11832 else if (type_quals
& TYPE_QUAL_CONST
)
11834 error ("const %qs cannot be declared %<mutable%>", name
);
11835 storage_class
= sc_none
;
11837 else if (TYPE_REF_P (type
))
11839 permerror (input_location
, "reference %qs cannot be declared "
11840 "%<mutable%>", name
);
11841 storage_class
= sc_none
;
11845 /* If this is declaring a typedef name, return a TYPE_DECL. */
11846 if (typedef_p
&& decl_context
!= TYPENAME
)
11850 /* This declaration:
11852 typedef void f(int) const;
11854 declares a function type which is not a member of any
11855 particular class, but which is cv-qualified; for
11856 example "f S::*" declares a pointer to a const-qualified
11857 member function of S. We record the cv-qualification in the
11859 if ((rqual
|| memfn_quals
) && TREE_CODE (type
) == FUNCTION_TYPE
)
11861 type
= apply_memfn_quals (type
, memfn_quals
, rqual
);
11863 /* We have now dealt with these qualifiers. */
11864 memfn_quals
= TYPE_UNQUALIFIED
;
11865 rqual
= REF_QUAL_NONE
;
11868 if (type_uses_auto (type
))
11870 error ("typedef declared %<auto%>");
11871 type
= error_mark_node
;
11875 error_at (location_of (reqs
), "requires-clause on typedef");
11877 if (id_declarator
&& declarator
->u
.id
.qualifying_scope
)
11879 error ("typedef name may not be a nested-name-specifier");
11880 type
= error_mark_node
;
11883 if (decl_context
== FIELD
)
11884 decl
= build_lang_decl (TYPE_DECL
, unqualified_id
, type
);
11886 decl
= build_decl (input_location
, TYPE_DECL
, unqualified_id
, type
);
11888 if (decl_context
!= FIELD
)
11890 if (!current_function_decl
)
11891 DECL_CONTEXT (decl
) = FROB_CONTEXT (current_namespace
);
11892 else if (DECL_MAYBE_IN_CHARGE_CDTOR_P (current_function_decl
))
11893 /* The TYPE_DECL is "abstract" because there will be
11894 clones of this constructor/destructor, and there will
11895 be copies of this TYPE_DECL generated in those
11896 clones. The decloning optimization (for space) may
11897 revert this subsequently if it determines that
11898 the clones should share a common implementation. */
11899 DECL_ABSTRACT_P (decl
) = true;
11901 else if (current_class_type
11902 && constructor_name_p (unqualified_id
, current_class_type
))
11903 permerror (input_location
, "ISO C++ forbids nested type %qD with same name "
11904 "as enclosing class",
11907 /* If the user declares "typedef struct {...} foo" then the
11908 struct will have an anonymous name. Fill that name in now.
11909 Nothing can refer to it, so nothing needs know about the name
11911 if (type
!= error_mark_node
11913 && TYPE_NAME (type
)
11914 && TREE_CODE (TYPE_NAME (type
)) == TYPE_DECL
11915 && TYPE_UNNAMED_P (type
)
11916 && declspecs
->type_definition_p
11917 && attributes_naming_typedef_ok (*attrlist
)
11918 && cp_type_quals (type
) == TYPE_UNQUALIFIED
)
11919 name_unnamed_type (type
, decl
);
11922 || (typedef_decl
&& C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl
)))
11923 C_TYPEDEF_EXPLICITLY_SIGNED (decl
) = 1;
11925 bad_specifiers (decl
, BSP_TYPE
, virtualp
,
11926 memfn_quals
!= TYPE_UNQUALIFIED
,
11927 inlinep
, friendp
, raises
!= NULL_TREE
,
11928 declspecs
->locations
);
11930 if (decl_spec_seq_has_spec_p (declspecs
, ds_alias
))
11931 /* Acknowledge that this was written:
11932 `using analias = atype;'. */
11933 TYPE_DECL_ALIAS_P (decl
) = 1;
11938 /* Detect the case of an array type of unspecified size
11939 which came, as such, direct from a typedef name.
11940 We must copy the type, so that the array's domain can be
11941 individually set by the object's initializer. */
11943 if (type
&& typedef_type
11944 && TREE_CODE (type
) == ARRAY_TYPE
&& !TYPE_DOMAIN (type
)
11945 && TYPE_MAIN_VARIANT (type
) == TYPE_MAIN_VARIANT (typedef_type
))
11946 type
= build_cplus_array_type (TREE_TYPE (type
), NULL_TREE
);
11948 /* Detect where we're using a typedef of function type to declare a
11949 function. PARMS will not be set, so we must create it now. */
11951 if (type
== typedef_type
&& TREE_CODE (type
) == FUNCTION_TYPE
)
11953 tree decls
= NULL_TREE
;
11956 for (args
= TYPE_ARG_TYPES (type
);
11957 args
&& args
!= void_list_node
;
11958 args
= TREE_CHAIN (args
))
11960 tree decl
= cp_build_parm_decl (NULL_TREE
, NULL_TREE
,
11961 TREE_VALUE (args
));
11963 DECL_CHAIN (decl
) = decls
;
11967 parms
= nreverse (decls
);
11969 if (decl_context
!= TYPENAME
)
11971 /* The qualifiers on the function type become the qualifiers on
11972 the non-static member function. */
11973 memfn_quals
|= type_memfn_quals (type
);
11974 rqual
= type_memfn_rqual (type
);
11975 type_quals
= TYPE_UNQUALIFIED
;
11979 /* If this is a type name (such as, in a cast or sizeof),
11980 compute the type and return it now. */
11982 if (decl_context
== TYPENAME
)
11984 /* Note that here we don't care about type_quals. */
11986 /* Special case: "friend class foo" looks like a TYPENAME context. */
11991 error ("%<inline%> specified for friend class declaration");
11997 /* Don't allow friend declaration without a class-key. */
11998 if (TREE_CODE (type
) == TEMPLATE_TYPE_PARM
)
11999 permerror (input_location
, "template parameters cannot be friends");
12000 else if (TREE_CODE (type
) == TYPENAME_TYPE
)
12001 permerror (input_location
, "friend declaration requires class-key, "
12002 "i.e. %<friend class %T::%D%>",
12003 TYPE_CONTEXT (type
), TYPENAME_TYPE_FULLNAME (type
));
12005 permerror (input_location
, "friend declaration requires class-key, "
12006 "i.e. %<friend %#T%>",
12010 /* Only try to do this stuff if we didn't already give up. */
12011 if (type
!= integer_type_node
)
12013 /* A friendly class? */
12014 if (current_class_type
)
12015 make_friend_class (current_class_type
, TYPE_MAIN_VARIANT (type
),
12016 /*complain=*/true);
12018 error ("trying to make class %qT a friend of global scope",
12021 type
= void_type_node
;
12024 else if (memfn_quals
|| rqual
)
12026 if (ctype
== NULL_TREE
12027 && TREE_CODE (type
) == METHOD_TYPE
)
12028 ctype
= TYPE_METHOD_BASETYPE (type
);
12031 type
= build_memfn_type (type
, ctype
, memfn_quals
, rqual
);
12032 /* Core issue #547: need to allow this in template type args.
12033 Allow it in general in C++11 for alias-declarations. */
12034 else if ((template_type_arg
|| cxx_dialect
>= cxx11
)
12035 && TREE_CODE (type
) == FUNCTION_TYPE
)
12036 type
= apply_memfn_quals (type
, memfn_quals
, rqual
);
12038 error ("invalid qualifiers on non-member function type");
12042 error_at (location_of (reqs
), "requires-clause on type-id");
12046 else if (unqualified_id
== NULL_TREE
&& decl_context
!= PARM
12047 && decl_context
!= CATCHPARM
12048 && TREE_CODE (type
) != UNION_TYPE
12050 && innermost_code
!= cdk_decomp
)
12052 error ("abstract declarator %qT used as declaration", type
);
12053 return error_mark_node
;
12056 if (!FUNC_OR_METHOD_TYPE_P (type
))
12058 /* Only functions may be declared using an operator-function-id. */
12059 if (dname
&& IDENTIFIER_ANY_OP_P (dname
))
12061 error ("declaration of %qD as non-function", dname
);
12062 return error_mark_node
;
12066 error_at (location_of (reqs
),
12067 "requires-clause on declaration of non-function type %qT",
12071 /* We don't check parameter types here because we can emit a better
12072 error message later. */
12073 if (decl_context
!= PARM
)
12075 type
= check_var_type (unqualified_id
, type
);
12076 if (type
== error_mark_node
)
12077 return error_mark_node
;
12080 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
12081 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
12083 if (decl_context
== PARM
|| decl_context
== CATCHPARM
)
12085 if (ctype
|| in_namespace
)
12086 error ("cannot use %<::%> in parameter declaration");
12088 if (type_uses_auto (type
)
12089 && !(cxx_dialect
>= cxx17
&& template_parm_flag
))
12091 if (cxx_dialect
>= cxx14
)
12092 error ("%<auto%> parameter not permitted in this context");
12094 error ("parameter declared %<auto%>");
12095 type
= error_mark_node
;
12098 /* A parameter declared as an array of T is really a pointer to T.
12099 One declared as a function is really a pointer to a function.
12100 One declared as a member is really a pointer to member. */
12102 if (TREE_CODE (type
) == ARRAY_TYPE
)
12104 /* Transfer const-ness of array into that of type pointed to. */
12105 type
= build_pointer_type (TREE_TYPE (type
));
12106 type_quals
= TYPE_UNQUALIFIED
;
12107 array_parameter_p
= true;
12109 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
12110 type
= build_pointer_type (type
);
12113 if (ctype
&& TREE_CODE (type
) == FUNCTION_TYPE
&& staticp
< 2
12114 && !(identifier_p (unqualified_id
)
12115 && IDENTIFIER_NEWDEL_OP_P (unqualified_id
)))
12117 cp_cv_quals real_quals
= memfn_quals
;
12118 if (cxx_dialect
< cxx14
&& constexpr_p
12119 && sfk
!= sfk_constructor
&& sfk
!= sfk_destructor
)
12120 real_quals
|= TYPE_QUAL_CONST
;
12121 type
= build_memfn_type (type
, ctype
, real_quals
, rqual
);
12125 tree decl
= NULL_TREE
;
12127 if (decl_context
== PARM
)
12129 decl
= cp_build_parm_decl (NULL_TREE
, unqualified_id
, type
);
12130 DECL_ARRAY_PARAMETER_P (decl
) = array_parameter_p
;
12132 bad_specifiers (decl
, BSP_PARM
, virtualp
,
12133 memfn_quals
!= TYPE_UNQUALIFIED
,
12134 inlinep
, friendp
, raises
!= NULL_TREE
,
12135 declspecs
->locations
);
12137 else if (decl_context
== FIELD
)
12139 if (!staticp
&& !friendp
&& TREE_CODE (type
) != METHOD_TYPE
)
12140 if (tree auto_node
= type_uses_auto (type
))
12142 location_t loc
= declspecs
->locations
[ds_type_spec
];
12143 if (CLASS_PLACEHOLDER_TEMPLATE (auto_node
))
12144 error_at (loc
, "invalid use of template-name %qE without an "
12146 CLASS_PLACEHOLDER_TEMPLATE (auto_node
));
12148 error_at (loc
, "non-static data member declared with "
12149 "placeholder %qT", auto_node
);
12150 type
= error_mark_node
;
12153 /* The C99 flexible array extension. */
12154 if (!staticp
&& TREE_CODE (type
) == ARRAY_TYPE
12155 && TYPE_DOMAIN (type
) == NULL_TREE
)
12158 && (TREE_CODE (ctype
) == UNION_TYPE
12159 || TREE_CODE (ctype
) == QUAL_UNION_TYPE
))
12161 error ("flexible array member in union");
12162 type
= error_mark_node
;
12166 /* Array is a flexible member. */
12167 if (in_system_header_at (input_location
))
12168 /* Do not warn on flexible array members in system
12169 headers because glibc uses them. */;
12171 pedwarn (input_location
, OPT_Wpedantic
,
12172 "ISO C++ forbids flexible array member %qs", name
);
12174 pedwarn (input_location
, OPT_Wpedantic
,
12175 "ISO C++ forbids flexible array members");
12177 /* Flexible array member has a null domain. */
12178 type
= build_cplus_array_type (TREE_TYPE (type
), NULL_TREE
);
12182 if (type
== error_mark_node
)
12184 /* Happens when declaring arrays of sizes which
12185 are error_mark_node, for example. */
12188 else if (in_namespace
&& !friendp
)
12190 /* Something like struct S { int N::j; }; */
12191 error ("invalid use of %<::%>");
12192 return error_mark_node
;
12194 else if (TREE_CODE (type
) == FUNCTION_TYPE
12195 || TREE_CODE (type
) == METHOD_TYPE
)
12198 tree function_context
;
12202 /* This should never happen in pure C++ (the check
12203 could be an assert). It could happen in
12204 Objective-C++ if someone writes invalid code that
12205 uses a function declaration for an instance
12206 variable or property (instance variables and
12207 properties are parsed as FIELD_DECLs, but they are
12208 part of an Objective-C class, not a C++ class).
12209 That code is invalid and is caught by this
12213 error ("declaration of function %qD in invalid context",
12215 return error_mark_node
;
12218 /* ``A union may [ ... ] not [ have ] virtual functions.''
12220 if (virtualp
&& TREE_CODE (ctype
) == UNION_TYPE
)
12222 error_at (declspecs
->locations
[ds_virtual
],
12223 "function %qD declared %<virtual%> inside a union",
12225 return error_mark_node
;
12229 && identifier_p (unqualified_id
)
12230 && IDENTIFIER_NEWDEL_OP_P (unqualified_id
))
12232 error_at (declspecs
->locations
[ds_virtual
],
12233 "%qD cannot be declared %<virtual%>, since it "
12234 "is always static", unqualified_id
);
12239 /* Check that the name used for a destructor makes sense. */
12240 if (sfk
== sfk_destructor
)
12242 tree uqname
= id_declarator
->u
.id
.unqualified_name
;
12246 gcc_assert (friendp
);
12247 error ("expected qualified name in friend declaration "
12248 "for destructor %qD", uqname
);
12249 return error_mark_node
;
12252 if (!check_dtor_name (ctype
, TREE_OPERAND (uqname
, 0)))
12254 error ("declaration of %qD as member of %qT",
12256 return error_mark_node
;
12260 error_at (declspecs
->locations
[ds_concept
],
12261 "a destructor cannot be %<concept%>");
12262 return error_mark_node
;
12266 error_at (declspecs
->locations
[ds_constexpr
],
12267 "a destructor cannot be %<constexpr%>");
12268 return error_mark_node
;
12271 else if (sfk
== sfk_constructor
&& friendp
&& !ctype
)
12273 error ("expected qualified name in friend declaration "
12274 "for constructor %qD",
12275 id_declarator
->u
.id
.unqualified_name
);
12276 return error_mark_node
;
12278 if (sfk
== sfk_constructor
)
12281 error_at (declspecs
->locations
[ds_concept
],
12282 "a constructor cannot be %<concept%>");
12283 return error_mark_node
;
12287 error_at (declspecs
->locations
[ds_concept
],
12288 "a concept cannot be a member function");
12292 if (TREE_CODE (unqualified_id
) == TEMPLATE_ID_EXPR
)
12294 tree tmpl
= TREE_OPERAND (unqualified_id
, 0);
12295 if (variable_template_p (tmpl
))
12297 error ("specialization of variable template %qD "
12298 "declared as function", tmpl
);
12299 inform (DECL_SOURCE_LOCATION (tmpl
),
12300 "variable template declared here");
12301 return error_mark_node
;
12305 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
12306 function_context
= (ctype
!= NULL_TREE
) ?
12307 decl_function_context (TYPE_MAIN_DECL (ctype
)) : NULL_TREE
;
12308 publicp
= (! friendp
|| ! staticp
)
12309 && function_context
== NULL_TREE
;
12311 decl
= grokfndecl (ctype
, type
,
12312 TREE_CODE (unqualified_id
) != TEMPLATE_ID_EXPR
12313 ? unqualified_id
: dname
,
12318 virtualp
, flags
, memfn_quals
, rqual
, raises
,
12319 friendp
? -1 : 0, friendp
, publicp
,
12320 inlinep
| (2 * constexpr_p
) | (4 * concept_p
),
12321 initialized
== SD_DELETED
, sfk
,
12322 funcdef_flag
, late_return_type_p
,
12323 template_count
, in_namespace
,
12324 attrlist
, declarator
->id_loc
);
12325 decl
= set_virt_specifiers (decl
, virt_specifiers
);
12326 if (decl
== NULL_TREE
)
12327 return error_mark_node
;
12329 /* This clobbers the attrs stored in `decl' from `attrlist'. */
12330 /* The decl and setting of decl_attr is also turned off. */
12331 decl
= build_decl_attribute_variant (decl
, decl_attr
);
12334 /* [class.conv.ctor]
12336 A constructor declared without the function-specifier
12337 explicit that can be called with a single parameter
12338 specifies a conversion from the type of its first
12339 parameter to the type of its class. Such a constructor
12340 is called a converting constructor. */
12341 if (explicitp
== 2)
12342 DECL_NONCONVERTING_P (decl
) = 1;
12344 else if (!staticp
&& !dependent_type_p (type
)
12345 && !COMPLETE_TYPE_P (complete_type (type
))
12346 && (!complete_or_array_type_p (type
)
12347 || initialized
== 0))
12349 if (TREE_CODE (type
) != ARRAY_TYPE
12350 || !COMPLETE_TYPE_P (TREE_TYPE (type
)))
12352 if (unqualified_id
)
12354 error ("field %qD has incomplete type %qT",
12355 unqualified_id
, type
);
12356 cxx_incomplete_type_inform (strip_array_types (type
));
12359 error ("name %qT has incomplete type", type
);
12361 type
= error_mark_node
;
12369 error ("%qE is neither function nor member function; "
12370 "cannot be declared friend", unqualified_id
);
12371 return error_mark_node
;
12378 /* Friends are treated specially. */
12379 if (ctype
== current_class_type
)
12380 ; /* We already issued a permerror. */
12381 else if (decl
&& DECL_NAME (decl
))
12383 if (template_class_depth (current_class_type
) == 0)
12385 decl
= check_explicit_specialization
12386 (unqualified_id
, decl
, template_count
,
12387 2 * funcdef_flag
+ 4);
12388 if (decl
== error_mark_node
)
12389 return error_mark_node
;
12392 decl
= do_friend (ctype
, unqualified_id
, decl
,
12398 return error_mark_node
;
12401 /* Structure field. It may not be a function, except for C++. */
12403 if (decl
== NULL_TREE
)
12407 /* C++ allows static class members. All other work
12408 for this is done by grokfield. */
12409 decl
= build_lang_decl_loc (declarator
12410 ? declarator
->id_loc
12412 VAR_DECL
, unqualified_id
, type
);
12413 set_linkage_for_static_data_member (decl
);
12415 error_at (declspecs
->locations
[ds_concept
],
12416 "static data member %qE declared %<concept%>",
12418 else if (constexpr_p
&& !initialized
)
12420 error ("%<constexpr%> static data member %qD must have an "
12421 "initializer", decl
);
12422 constexpr_p
= false;
12426 mark_inline_variable (decl
, declspecs
->locations
[ds_inline
]);
12428 if (!DECL_VAR_DECLARED_INLINE_P (decl
)
12429 && !(cxx_dialect
>= cxx17
&& constexpr_p
))
12430 /* Even if there is an in-class initialization, DECL
12431 is considered undefined until an out-of-class
12432 definition is provided, unless this is an inline
12434 DECL_EXTERNAL (decl
) = 1;
12438 CP_DECL_THREAD_LOCAL_P (decl
) = true;
12439 if (!processing_template_decl
)
12440 set_decl_tls_model (decl
, decl_default_tls_model (decl
));
12441 if (declspecs
->gnu_thread_keyword_p
)
12442 SET_DECL_GNU_TLS_P (decl
);
12448 error_at (declspecs
->locations
[ds_concept
],
12449 "non-static data member %qE declared %<concept%>",
12451 else if (constexpr_p
)
12453 error_at (declspecs
->locations
[ds_constexpr
],
12454 "non-static data member %qE declared %<constexpr%>",
12456 constexpr_p
= false;
12458 decl
= build_decl (input_location
,
12459 FIELD_DECL
, unqualified_id
, type
);
12460 DECL_NONADDRESSABLE_P (decl
) = bitfield
;
12461 if (bitfield
&& !unqualified_id
)
12463 TREE_NO_WARNING (decl
) = 1;
12464 DECL_PADDING_P (decl
) = 1;
12467 if (storage_class
== sc_mutable
)
12469 DECL_MUTABLE_P (decl
) = 1;
12470 storage_class
= sc_none
;
12475 /* An attempt is being made to initialize a non-static
12476 member. This is new in C++11. */
12477 maybe_warn_cpp0x (CPP0X_NSDMI
);
12479 /* If this has been parsed with static storage class, but
12480 errors forced staticp to be cleared, ensure NSDMI is
12482 if (declspecs
->storage_class
== sc_static
)
12483 DECL_INITIAL (decl
) = error_mark_node
;
12487 bad_specifiers (decl
, BSP_FIELD
, virtualp
,
12488 memfn_quals
!= TYPE_UNQUALIFIED
,
12489 staticp
? false : inlinep
, friendp
,
12490 raises
!= NULL_TREE
,
12491 declspecs
->locations
);
12494 else if (TREE_CODE (type
) == FUNCTION_TYPE
12495 || TREE_CODE (type
) == METHOD_TYPE
)
12497 tree original_name
;
12500 if (!unqualified_id
)
12501 return error_mark_node
;
12503 if (TREE_CODE (unqualified_id
) == TEMPLATE_ID_EXPR
)
12504 original_name
= dname
;
12506 original_name
= unqualified_id
;
12507 // FIXME:gcc_assert (original_name == dname);
12509 if (storage_class
== sc_auto
)
12510 error ("storage class %<auto%> invalid for function %qs", name
);
12511 else if (storage_class
== sc_register
)
12512 error ("storage class %<register%> invalid for function %qs", name
);
12515 if (declspecs
->gnu_thread_keyword_p
)
12516 error_at (declspecs
->locations
[ds_thread
],
12517 "storage class %<__thread%> invalid for function %qs",
12520 error_at (declspecs
->locations
[ds_thread
],
12521 "storage class %<thread_local%> invalid for "
12522 "function %qs", name
);
12525 if (virt_specifiers
)
12526 error ("virt-specifiers in %qs not allowed outside a class "
12527 "definition", name
);
12528 /* Function declaration not at top level.
12529 Storage classes other than `extern' are not allowed
12530 and `extern' makes no difference. */
12531 if (! toplevel_bindings_p ()
12532 && (storage_class
== sc_static
12533 || decl_spec_seq_has_spec_p (declspecs
, ds_inline
))
12536 if (storage_class
== sc_static
)
12537 pedwarn (declspecs
->locations
[ds_storage_class
], OPT_Wpedantic
,
12538 "%<static%> specifier invalid for function %qs "
12539 "declared out of global scope", name
);
12541 pedwarn (declspecs
->locations
[ds_inline
], OPT_Wpedantic
,
12542 "%<inline%> specifier invalid for function %qs "
12543 "declared out of global scope", name
);
12546 if (ctype
== NULL_TREE
)
12550 error ("virtual non-class function %qs", name
);
12553 else if (sfk
== sfk_constructor
12554 || sfk
== sfk_destructor
)
12556 error (funcdef_flag
12557 ? G_("%qs defined in a non-class scope")
12558 : G_("%qs declared in a non-class scope"), name
);
12563 /* Record whether the function is public. */
12564 publicp
= (ctype
!= NULL_TREE
12565 || storage_class
!= sc_static
);
12567 decl
= grokfndecl (ctype
, type
, original_name
, parms
, unqualified_id
,
12569 reqs
, virtualp
, flags
, memfn_quals
, rqual
, raises
,
12572 inlinep
| (2 * constexpr_p
) | (4 * concept_p
),
12573 initialized
== SD_DELETED
,
12576 late_return_type_p
,
12577 template_count
, in_namespace
, attrlist
,
12578 declarator
->id_loc
);
12579 if (decl
== NULL_TREE
)
12580 return error_mark_node
;
12582 if (explicitp
== 2)
12583 DECL_NONCONVERTING_P (decl
) = 1;
12586 int invalid_static
= 0;
12588 /* Don't allow a static member function in a class, and forbid
12589 declaring main to be static. */
12590 if (TREE_CODE (type
) == METHOD_TYPE
)
12592 permerror (input_location
, "cannot declare member function %qD to have "
12593 "static linkage", decl
);
12594 invalid_static
= 1;
12596 else if (current_function_decl
)
12598 /* 7.1.1: There can be no static function declarations within a
12600 error_at (declspecs
->locations
[ds_storage_class
],
12601 "cannot declare static function inside another function");
12602 invalid_static
= 1;
12605 if (invalid_static
)
12608 storage_class
= sc_none
;
12614 /* It's a variable. */
12616 /* An uninitialized decl with `extern' is a reference. */
12617 decl
= grokvardecl (type
, dname
, unqualified_id
,
12624 ctype
? ctype
: in_namespace
);
12625 if (decl
== NULL_TREE
)
12626 return error_mark_node
;
12628 bad_specifiers (decl
, BSP_VAR
, virtualp
,
12629 memfn_quals
!= TYPE_UNQUALIFIED
,
12630 inlinep
, friendp
, raises
!= NULL_TREE
,
12631 declspecs
->locations
);
12635 DECL_CONTEXT (decl
) = ctype
;
12638 permerror (input_location
, "%<static%> may not be used when defining "
12639 "(as opposed to declaring) a static data member");
12641 storage_class
= sc_none
;
12643 if (storage_class
== sc_register
&& TREE_STATIC (decl
))
12645 error ("static member %qD declared %<register%>", decl
);
12646 storage_class
= sc_none
;
12648 if (storage_class
== sc_extern
&& pedantic
)
12650 pedwarn (input_location
, OPT_Wpedantic
,
12651 "cannot explicitly declare member %q#D to have "
12652 "extern linkage", decl
);
12653 storage_class
= sc_none
;
12656 else if (constexpr_p
&& DECL_EXTERNAL (decl
))
12658 error ("declaration of %<constexpr%> variable %qD "
12659 "is not a definition", decl
);
12660 constexpr_p
= false;
12664 mark_inline_variable (decl
, declspecs
->locations
[ds_inline
]);
12665 if (innermost_code
== cdk_decomp
)
12667 gcc_assert (declarator
&& declarator
->kind
== cdk_decomp
);
12668 DECL_SOURCE_LOCATION (decl
) = declarator
->id_loc
;
12669 DECL_ARTIFICIAL (decl
) = 1;
12670 fit_decomposition_lang_decl (decl
, NULL_TREE
);
12674 if (VAR_P (decl
) && !initialized
)
12675 if (tree auto_node
= type_uses_auto (type
))
12676 if (!CLASS_PLACEHOLDER_TEMPLATE (auto_node
))
12678 location_t loc
= declspecs
->locations
[ds_type_spec
];
12679 error_at (loc
, "declaration of %q#D has no initializer", decl
);
12680 TREE_TYPE (decl
) = error_mark_node
;
12683 if (storage_class
== sc_extern
&& initialized
&& !funcdef_flag
)
12685 if (toplevel_bindings_p ())
12687 /* It's common practice (and completely valid) to have a const
12688 be initialized and declared extern. */
12689 if (!(type_quals
& TYPE_QUAL_CONST
))
12690 warning (0, "%qs initialized and declared %<extern%>", name
);
12694 error ("%qs has both %<extern%> and initializer", name
);
12695 return error_mark_node
;
12699 /* Record `register' declaration for warnings on &
12700 and in case doing stupid register allocation. */
12702 if (storage_class
== sc_register
)
12704 DECL_REGISTER (decl
) = 1;
12705 /* Warn about register storage specifiers on PARM_DECLs. */
12706 if (TREE_CODE (decl
) == PARM_DECL
)
12708 if (cxx_dialect
>= cxx17
)
12709 pedwarn (DECL_SOURCE_LOCATION (decl
), OPT_Wregister
,
12710 "ISO C++17 does not allow %<register%> storage "
12711 "class specifier");
12713 warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wregister
,
12714 "%<register%> storage class specifier used");
12717 else if (storage_class
== sc_extern
)
12718 DECL_THIS_EXTERN (decl
) = 1;
12719 else if (storage_class
== sc_static
)
12720 DECL_THIS_STATIC (decl
) = 1;
12722 /* Set constexpr flag on vars (functions got it in grokfndecl). */
12723 if (constexpr_p
&& VAR_P (decl
))
12724 DECL_DECLARED_CONSTEXPR_P (decl
) = true;
12726 /* Record constancy and volatility on the DECL itself . There's
12727 no need to do this when processing a template; we'll do this
12728 for the instantiated declaration based on the type of DECL. */
12729 if (!processing_template_decl
)
12730 cp_apply_type_quals_to_decl (type_quals
, decl
);
12736 /* Subroutine of start_function. Ensure that each of the parameter
12737 types (as listed in PARMS) is complete, as is required for a
12738 function definition. */
12741 require_complete_types_for_parms (tree parms
)
12743 for (; parms
; parms
= DECL_CHAIN (parms
))
12745 if (dependent_type_p (TREE_TYPE (parms
)))
12747 if (!VOID_TYPE_P (TREE_TYPE (parms
))
12748 && complete_type_or_else (TREE_TYPE (parms
), parms
))
12750 relayout_decl (parms
);
12751 DECL_ARG_TYPE (parms
) = type_passed_as (TREE_TYPE (parms
));
12753 maybe_warn_parm_abi (TREE_TYPE (parms
),
12754 DECL_SOURCE_LOCATION (parms
));
12757 /* grokparms or complete_type_or_else will have already issued
12759 TREE_TYPE (parms
) = error_mark_node
;
12763 /* Returns nonzero if T is a local variable. */
12766 local_variable_p (const_tree t
)
12769 /* A VAR_DECL with a context that is a _TYPE is a static data
12771 && !TYPE_P (CP_DECL_CONTEXT (t
))
12772 /* Any other non-local variable must be at namespace scope. */
12773 && !DECL_NAMESPACE_SCOPE_P (t
))
12774 || (TREE_CODE (t
) == PARM_DECL
))
12780 /* Like local_variable_p, but suitable for use as a tree-walking
12784 local_variable_p_walkfn (tree
*tp
, int *walk_subtrees
,
12787 if (local_variable_p (*tp
)
12788 && (!DECL_ARTIFICIAL (*tp
) || DECL_NAME (*tp
) == this_identifier
))
12790 else if (TYPE_P (*tp
))
12791 *walk_subtrees
= 0;
12796 /* Check that ARG, which is a default-argument expression for a
12797 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
12798 something goes wrong. DECL may also be a _TYPE node, rather than a
12799 DECL, if there is no DECL available. */
12802 check_default_argument (tree decl
, tree arg
, tsubst_flags_t complain
)
12807 if (TREE_CODE (arg
) == DEFAULT_ARG
)
12808 /* We get a DEFAULT_ARG when looking at an in-class declaration
12809 with a default argument. Ignore the argument for now; we'll
12810 deal with it after the class is complete. */
12819 decl_type
= TREE_TYPE (decl
);
12821 if (arg
== error_mark_node
12822 || decl
== error_mark_node
12823 || TREE_TYPE (arg
) == error_mark_node
12824 || decl_type
== error_mark_node
)
12825 /* Something already went wrong. There's no need to check
12827 return error_mark_node
;
12829 /* [dcl.fct.default]
12831 A default argument expression is implicitly converted to the
12833 ++cp_unevaluated_operand
;
12834 /* Avoid digest_init clobbering the initializer. */
12835 tree carg
= BRACE_ENCLOSED_INITIALIZER_P (arg
) ? unshare_expr (arg
): arg
;
12836 perform_implicit_conversion_flags (decl_type
, carg
, complain
,
12838 --cp_unevaluated_operand
;
12840 /* Avoid redundant -Wzero-as-null-pointer-constant warnings at
12842 if (TYPE_PTR_OR_PTRMEM_P (decl_type
)
12843 && null_ptr_cst_p (arg
))
12844 return nullptr_node
;
12846 /* [dcl.fct.default]
12848 Local variables shall not be used in default argument
12851 The keyword `this' shall not be used in a default argument of a
12852 member function. */
12853 var
= cp_walk_tree_without_duplicates (&arg
, local_variable_p_walkfn
, NULL
);
12856 if (complain
& tf_warning_or_error
)
12858 if (DECL_NAME (var
) == this_identifier
)
12859 permerror (input_location
, "default argument %qE uses %qD",
12862 error ("default argument %qE uses local variable %qD", arg
, var
);
12864 return error_mark_node
;
12871 /* Returns a deprecated type used within TYPE, or NULL_TREE if none. */
12874 type_is_deprecated (tree type
)
12876 enum tree_code code
;
12877 if (TREE_DEPRECATED (type
))
12879 if (TYPE_NAME (type
))
12881 if (TREE_DEPRECATED (TYPE_NAME (type
)))
12887 /* Do warn about using typedefs to a deprecated class. */
12888 if (OVERLOAD_TYPE_P (type
) && type
!= TYPE_MAIN_VARIANT (type
))
12889 return type_is_deprecated (TYPE_MAIN_VARIANT (type
));
12891 code
= TREE_CODE (type
);
12893 if (code
== POINTER_TYPE
|| code
== REFERENCE_TYPE
12894 || code
== OFFSET_TYPE
|| code
== FUNCTION_TYPE
12895 || code
== METHOD_TYPE
|| code
== ARRAY_TYPE
)
12896 return type_is_deprecated (TREE_TYPE (type
));
12898 if (TYPE_PTRMEMFUNC_P (type
))
12899 return type_is_deprecated
12900 (TREE_TYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (type
))));
12905 /* Decode the list of parameter types for a function type.
12906 Given the list of things declared inside the parens,
12907 return a list of types.
12909 If this parameter does not end with an ellipsis, we append
12912 *PARMS is set to the chain of PARM_DECLs created. */
12915 grokparms (tree parmlist
, tree
*parms
)
12917 tree result
= NULL_TREE
;
12918 tree decls
= NULL_TREE
;
12922 for (parm
= parmlist
; parm
!= NULL_TREE
; parm
= TREE_CHAIN (parm
))
12924 tree type
= NULL_TREE
;
12925 tree init
= TREE_PURPOSE (parm
);
12926 tree decl
= TREE_VALUE (parm
);
12928 if (parm
== void_list_node
)
12931 if (! decl
|| TREE_TYPE (decl
) == error_mark_node
)
12934 type
= TREE_TYPE (decl
);
12935 if (VOID_TYPE_P (type
))
12937 if (same_type_p (type
, void_type_node
)
12939 && !DECL_NAME (decl
) && !result
12940 && TREE_CHAIN (parm
) == void_list_node
)
12941 /* DR 577: A parameter list consisting of a single
12942 unnamed parameter of non-dependent type 'void'. */
12944 else if (cv_qualified_p (type
))
12945 error_at (DECL_SOURCE_LOCATION (decl
),
12946 "invalid use of cv-qualified type %qT in "
12947 "parameter declaration", type
);
12949 error_at (DECL_SOURCE_LOCATION (decl
),
12950 "invalid use of type %<void%> in parameter "
12952 /* It's not a good idea to actually create parameters of
12953 type `void'; other parts of the compiler assume that a
12954 void type terminates the parameter list. */
12955 type
= error_mark_node
;
12956 TREE_TYPE (decl
) = error_mark_node
;
12959 if (type
!= error_mark_node
)
12961 if (deprecated_state
!= DEPRECATED_SUPPRESS
)
12963 tree deptype
= type_is_deprecated (type
);
12965 cp_warn_deprecated_use (deptype
);
12968 /* Top-level qualifiers on the parameters are
12969 ignored for function types. */
12970 type
= cp_build_qualified_type (type
, 0);
12971 if (TREE_CODE (type
) == METHOD_TYPE
)
12973 error ("parameter %qD invalidly declared method type", decl
);
12974 type
= build_pointer_type (type
);
12975 TREE_TYPE (decl
) = type
;
12977 else if (abstract_virtuals_error (decl
, type
))
12978 any_error
= 1; /* Seems like a good idea. */
12979 else if (cxx_dialect
< cxx17
&& INDIRECT_TYPE_P (type
))
12981 /* Before C++17 DR 393:
12982 [dcl.fct]/6, parameter types cannot contain pointers
12983 (references) to arrays of unknown bound. */
12984 tree t
= TREE_TYPE (type
);
12985 int ptr
= TYPE_PTR_P (type
);
12989 if (TYPE_PTR_P (t
))
12991 else if (TREE_CODE (t
) != ARRAY_TYPE
)
12993 else if (!TYPE_DOMAIN (t
))
12997 if (TREE_CODE (t
) == ARRAY_TYPE
)
12998 pedwarn (DECL_SOURCE_LOCATION (decl
), OPT_Wpedantic
,
13000 ? G_("parameter %qD includes pointer to array of "
13001 "unknown bound %qT")
13002 : G_("parameter %qD includes reference to array of "
13003 "unknown bound %qT"),
13009 else if (init
&& !processing_template_decl
)
13010 init
= check_default_argument (decl
, init
, tf_warning_or_error
);
13013 DECL_CHAIN (decl
) = decls
;
13015 result
= tree_cons (init
, type
, result
);
13017 decls
= nreverse (decls
);
13018 result
= nreverse (result
);
13020 result
= chainon (result
, void_list_node
);
13027 /* D is a constructor or overloaded `operator='.
13029 Let T be the class in which D is declared. Then, this function
13032 -1 if D's is an ill-formed constructor or copy assignment operator
13033 whose first parameter is of type `T'.
13034 0 if D is not a copy constructor or copy assignment
13036 1 if D is a copy constructor or copy assignment operator whose
13037 first parameter is a reference to non-const qualified T.
13038 2 if D is a copy constructor or copy assignment operator whose
13039 first parameter is a reference to const qualified T.
13041 This function can be used as a predicate. Positive values indicate
13042 a copy constructor and nonzero values indicate a copy assignment
13046 copy_fn_p (const_tree d
)
13052 gcc_assert (DECL_FUNCTION_MEMBER_P (d
));
13054 if (TREE_CODE (d
) == TEMPLATE_DECL
13055 || (DECL_TEMPLATE_INFO (d
)
13056 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d
))))
13057 /* Instantiations of template member functions are never copy
13058 functions. Note that member functions of templated classes are
13059 represented as template functions internally, and we must
13060 accept those as copy functions. */
13063 args
= FUNCTION_FIRST_USER_PARMTYPE (d
);
13067 arg_type
= TREE_VALUE (args
);
13068 if (arg_type
== error_mark_node
)
13071 if (TYPE_MAIN_VARIANT (arg_type
) == DECL_CONTEXT (d
))
13073 /* Pass by value copy assignment operator. */
13076 else if (TYPE_REF_P (arg_type
)
13077 && !TYPE_REF_IS_RVALUE (arg_type
)
13078 && TYPE_MAIN_VARIANT (TREE_TYPE (arg_type
)) == DECL_CONTEXT (d
))
13080 if (CP_TYPE_CONST_P (TREE_TYPE (arg_type
)))
13086 args
= TREE_CHAIN (args
);
13088 if (args
&& args
!= void_list_node
&& !TREE_PURPOSE (args
))
13089 /* There are more non-optional args. */
13095 /* D is a constructor or overloaded `operator='.
13097 Let T be the class in which D is declared. Then, this function
13098 returns true when D is a move constructor or move assignment
13099 operator, false otherwise. */
13102 move_fn_p (const_tree d
)
13104 gcc_assert (DECL_FUNCTION_MEMBER_P (d
));
13106 if (cxx_dialect
== cxx98
)
13107 /* There are no move constructors if we are in C++98 mode. */
13110 if (TREE_CODE (d
) == TEMPLATE_DECL
13111 || (DECL_TEMPLATE_INFO (d
)
13112 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d
))))
13113 /* Instantiations of template member functions are never move
13114 functions. Note that member functions of templated classes are
13115 represented as template functions internally, and we must
13116 accept those as move functions. */
13119 return move_signature_fn_p (d
);
13122 /* D is a constructor or overloaded `operator='.
13124 Then, this function returns true when D has the same signature as a move
13125 constructor or move assignment operator (because either it is such a
13126 ctor/op= or it is a template specialization with the same signature),
13127 false otherwise. */
13130 move_signature_fn_p (const_tree d
)
13134 bool result
= false;
13136 args
= FUNCTION_FIRST_USER_PARMTYPE (d
);
13140 arg_type
= TREE_VALUE (args
);
13141 if (arg_type
== error_mark_node
)
13144 if (TYPE_REF_P (arg_type
)
13145 && TYPE_REF_IS_RVALUE (arg_type
)
13146 && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (arg_type
)),
13150 args
= TREE_CHAIN (args
);
13152 if (args
&& args
!= void_list_node
&& !TREE_PURPOSE (args
))
13153 /* There are more non-optional args. */
13159 /* Remember any special properties of member function DECL. */
13162 grok_special_member_properties (tree decl
)
13166 if (!DECL_NONSTATIC_MEMBER_FUNCTION_P (decl
))
13169 class_type
= DECL_CONTEXT (decl
);
13170 if (IDENTIFIER_CTOR_P (DECL_NAME (decl
)))
13172 int ctor
= copy_fn_p (decl
);
13174 if (!DECL_ARTIFICIAL (decl
))
13175 TYPE_HAS_USER_CONSTRUCTOR (class_type
) = 1;
13181 A non-template constructor for class X is a copy
13182 constructor if its first parameter is of type X&, const
13183 X&, volatile X& or const volatile X&, and either there
13184 are no other parameters or else all other parameters have
13185 default arguments. */
13186 TYPE_HAS_COPY_CTOR (class_type
) = 1;
13187 if (user_provided_p (decl
))
13188 TYPE_HAS_COMPLEX_COPY_CTOR (class_type
) = 1;
13190 TYPE_HAS_CONST_COPY_CTOR (class_type
) = 1;
13192 else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl
)))
13193 TYPE_HAS_DEFAULT_CONSTRUCTOR (class_type
) = 1;
13194 else if (move_fn_p (decl
) && user_provided_p (decl
))
13195 TYPE_HAS_COMPLEX_MOVE_CTOR (class_type
) = 1;
13196 else if (is_list_ctor (decl
))
13197 TYPE_HAS_LIST_CTOR (class_type
) = 1;
13199 if (DECL_DECLARED_CONSTEXPR_P (decl
)
13200 && !ctor
&& !move_fn_p (decl
))
13201 TYPE_HAS_CONSTEXPR_CTOR (class_type
) = 1;
13203 else if (DECL_NAME (decl
) == assign_op_identifier
)
13207 A non-template assignment operator for class X is a copy
13208 assignment operator if its parameter is of type X, X&, const
13209 X&, volatile X& or const volatile X&. */
13211 int assop
= copy_fn_p (decl
);
13215 TYPE_HAS_COPY_ASSIGN (class_type
) = 1;
13216 if (user_provided_p (decl
))
13217 TYPE_HAS_COMPLEX_COPY_ASSIGN (class_type
) = 1;
13219 TYPE_HAS_CONST_COPY_ASSIGN (class_type
) = 1;
13221 else if (move_fn_p (decl
) && user_provided_p (decl
))
13222 TYPE_HAS_COMPLEX_MOVE_ASSIGN (class_type
) = 1;
13224 else if (IDENTIFIER_CONV_OP_P (DECL_NAME (decl
)))
13225 TYPE_HAS_CONVERSION (class_type
) = true;
13227 /* Destructors are handled in check_methods. */
13230 /* Check a constructor DECL has the correct form. Complains
13231 if the class has a constructor of the form X(X). */
13234 grok_ctor_properties (const_tree ctype
, const_tree decl
)
13236 int ctor_parm
= copy_fn_p (decl
);
13242 A declaration of a constructor for a class X is ill-formed if
13243 its first parameter is of type (optionally cv-qualified) X
13244 and either there are no other parameters or else all other
13245 parameters have default arguments.
13247 We *don't* complain about member template instantiations that
13248 have this form, though; they can occur as we try to decide
13249 what constructor to use during overload resolution. Since
13250 overload resolution will never prefer such a constructor to
13251 the non-template copy constructor (which is either explicitly
13252 or implicitly defined), there's no need to worry about their
13253 existence. Theoretically, they should never even be
13254 instantiated, but that's hard to forestall. */
13255 error ("invalid constructor; you probably meant %<%T (const %T&)%>",
13263 /* DECL is a declaration for an overloaded or conversion operator. If
13264 COMPLAIN is true, errors are issued for invalid declarations. */
13267 grok_op_properties (tree decl
, bool complain
)
13269 tree argtypes
= TYPE_ARG_TYPES (TREE_TYPE (decl
));
13270 bool methodp
= TREE_CODE (TREE_TYPE (decl
)) == METHOD_TYPE
;
13271 tree name
= DECL_NAME (decl
);
13272 location_t loc
= DECL_SOURCE_LOCATION (decl
);
13274 tree class_type
= DECL_CONTEXT (decl
);
13275 if (class_type
&& !CLASS_TYPE_P (class_type
))
13276 class_type
= NULL_TREE
;
13278 tree_code operator_code
;
13280 if (IDENTIFIER_CONV_OP_P (name
))
13282 /* Conversion operators are TYPE_EXPR for the purposes of this
13284 operator_code
= TYPE_EXPR
;
13285 op_flags
= OVL_OP_FLAG_UNARY
;
13289 const ovl_op_info_t
*ovl_op
= IDENTIFIER_OVL_OP_INFO (name
);
13291 operator_code
= ovl_op
->tree_code
;
13292 op_flags
= ovl_op
->flags
;
13293 gcc_checking_assert (operator_code
!= ERROR_MARK
);
13294 DECL_OVERLOADED_OPERATOR_CODE_RAW (decl
) = ovl_op
->ovl_op_code
;
13297 if (op_flags
& OVL_OP_FLAG_ALLOC
)
13299 /* operator new and operator delete are quite special. */
13303 case OVL_OP_FLAG_ALLOC
:
13304 TYPE_HAS_NEW_OPERATOR (class_type
) = 1;
13307 case OVL_OP_FLAG_ALLOC
| OVL_OP_FLAG_DELETE
:
13308 TYPE_GETS_DELETE (class_type
) |= 1;
13311 case OVL_OP_FLAG_ALLOC
| OVL_OP_FLAG_VEC
:
13312 TYPE_HAS_ARRAY_NEW_OPERATOR (class_type
) = 1;
13315 case OVL_OP_FLAG_ALLOC
| OVL_OP_FLAG_DELETE
| OVL_OP_FLAG_VEC
:
13316 TYPE_GETS_DELETE (class_type
) |= 2;
13320 gcc_unreachable ();
13323 /* [basic.std.dynamic.allocation]/1:
13325 A program is ill-formed if an allocation function is declared
13326 in a namespace scope other than global scope or declared
13327 static in global scope.
13329 The same also holds true for deallocation functions. */
13330 if (DECL_NAMESPACE_SCOPE_P (decl
))
13332 if (CP_DECL_CONTEXT (decl
) != global_namespace
)
13334 error_at (loc
, "%qD may not be declared within a namespace",
13339 if (!TREE_PUBLIC (decl
))
13341 error_at (loc
, "%qD may not be declared as static", decl
);
13346 if (op_flags
& OVL_OP_FLAG_DELETE
)
13347 TREE_TYPE (decl
) = coerce_delete_type (TREE_TYPE (decl
), loc
);
13350 DECL_IS_OPERATOR_NEW (decl
) = 1;
13351 TREE_TYPE (decl
) = coerce_new_type (TREE_TYPE (decl
), loc
);
13357 /* An operator function must either be a non-static member function
13358 or have at least one parameter of a class, a reference to a class,
13359 an enumeration, or a reference to an enumeration. 13.4.0.6 */
13360 if (! methodp
|| DECL_STATIC_FUNCTION_P (decl
))
13362 if (operator_code
== TYPE_EXPR
13363 || operator_code
== CALL_EXPR
13364 || operator_code
== COMPONENT_REF
13365 || operator_code
== ARRAY_REF
13366 || operator_code
== NOP_EXPR
)
13368 error_at (loc
, "%qD must be a nonstatic member function", decl
);
13372 if (DECL_STATIC_FUNCTION_P (decl
))
13374 error_at (loc
, "%qD must be either a non-static member "
13375 "function or a non-member function", decl
);
13379 for (tree arg
= argtypes
; ; arg
= TREE_CHAIN (arg
))
13381 if (!arg
|| arg
== void_list_node
)
13384 error_at(loc
, "%qD must have an argument of class or "
13385 "enumerated type", decl
);
13389 tree type
= non_reference (TREE_VALUE (arg
));
13390 if (type
== error_mark_node
)
13393 /* MAYBE_CLASS_TYPE_P, rather than CLASS_TYPE_P, is used
13394 because these checks are performed even on template
13396 if (MAYBE_CLASS_TYPE_P (type
)
13397 || TREE_CODE (type
) == ENUMERAL_TYPE
)
13402 if (operator_code
== CALL_EXPR
)
13403 /* There are no further restrictions on the arguments to an overloaded
13407 if (operator_code
== COND_EXPR
)
13410 error_at (loc
, "ISO C++ prohibits overloading operator ?:");
13414 /* Count the number of arguments and check for ellipsis. */
13416 for (tree arg
= argtypes
; arg
!= void_list_node
; arg
= TREE_CHAIN (arg
))
13421 error_at (loc
, "%qD must not have variable number of arguments",
13428 /* Verify correct number of arguments. */
13431 case OVL_OP_FLAG_AMBIARY
:
13434 /* We have a unary instance of an ambi-ary op. Remap to the
13436 unsigned alt
= ovl_op_alternate
[ovl_op_mapping
[operator_code
]];
13437 const ovl_op_info_t
*ovl_op
= &ovl_op_info
[false][alt
];
13438 gcc_checking_assert (ovl_op
->flags
== OVL_OP_FLAG_UNARY
);
13439 operator_code
= ovl_op
->tree_code
;
13440 DECL_OVERLOADED_OPERATOR_CODE_RAW (decl
) = ovl_op
->ovl_op_code
;
13442 else if (arity
!= 2)
13444 /* This was an ambiguous operator but is invalid. */
13447 ? G_("%qD must have either zero or one argument")
13448 : G_("%qD must have either one or two arguments"), decl
);
13451 else if ((operator_code
== POSTINCREMENT_EXPR
13452 || operator_code
== POSTDECREMENT_EXPR
)
13453 && ! processing_template_decl
13454 /* x++ and x--'s second argument must be an int. */
13455 && ! same_type_p (TREE_VALUE (TREE_CHAIN (argtypes
)),
13456 integer_type_node
))
13460 ? G_("postfix %qD must have %<int%> as its argument")
13461 : G_("postfix %qD must have %<int%> as its second argument"),
13467 case OVL_OP_FLAG_UNARY
:
13472 ? G_("%qD must have no arguments")
13473 : G_("%qD must have exactly one argument"), decl
);
13478 case OVL_OP_FLAG_BINARY
:
13483 ? G_("%qD must have exactly one argument")
13484 : G_("%qD must have exactly two arguments"), decl
);
13490 gcc_unreachable ();
13493 /* There can be no default arguments. */
13494 for (tree arg
= argtypes
; arg
!= void_list_node
; arg
= TREE_CHAIN (arg
))
13495 if (TREE_PURPOSE (arg
))
13497 TREE_PURPOSE (arg
) = NULL_TREE
;
13498 error_at (loc
, "%qD cannot have default arguments", decl
);
13502 /* At this point the declaration is well-formed. It may not be
13503 sensible though. */
13505 /* Check member function warnings only on the in-class declaration.
13506 There's no point warning on an out-of-class definition. */
13507 if (class_type
&& class_type
!= current_class_type
)
13510 /* Warn about conversion operators that will never be used. */
13511 if (IDENTIFIER_CONV_OP_P (name
)
13512 && ! DECL_TEMPLATE_INFO (decl
)
13513 && warn_conversion
)
13515 tree t
= TREE_TYPE (name
);
13516 int ref
= TYPE_REF_P (t
);
13519 t
= TYPE_MAIN_VARIANT (TREE_TYPE (t
));
13521 if (VOID_TYPE_P (t
))
13522 warning_at (loc
, OPT_Wconversion
,
13524 ? G_("conversion to a reference to void "
13525 "will never use a type conversion operator")
13526 : G_("conversion to void "
13527 "will never use a type conversion operator"));
13528 else if (class_type
)
13530 if (t
== class_type
)
13531 warning_at (loc
, OPT_Wconversion
,
13533 ? G_("conversion to a reference to the same type "
13534 "will never use a type conversion operator")
13535 : G_("conversion to the same type "
13536 "will never use a type conversion operator"));
13537 /* Don't force t to be complete here. */
13538 else if (MAYBE_CLASS_TYPE_P (t
)
13539 && COMPLETE_TYPE_P (t
)
13540 && DERIVED_FROM_P (t
, class_type
))
13541 warning_at (loc
, OPT_Wconversion
,
13543 ? G_("conversion to a reference to a base class "
13544 "will never use a type conversion operator")
13545 : G_("conversion to a base class "
13546 "will never use a type conversion operator"));
13553 /* Effective C++ rules below. */
13555 /* More Effective C++ rule 7. */
13556 if (operator_code
== TRUTH_ANDIF_EXPR
13557 || operator_code
== TRUTH_ORIF_EXPR
13558 || operator_code
== COMPOUND_EXPR
)
13559 warning_at (loc
, OPT_Weffc__
,
13560 "user-defined %qD always evaluates both arguments", decl
);
13562 /* More Effective C++ rule 6. */
13563 if (operator_code
== POSTINCREMENT_EXPR
13564 || operator_code
== POSTDECREMENT_EXPR
13565 || operator_code
== PREINCREMENT_EXPR
13566 || operator_code
== PREDECREMENT_EXPR
)
13568 tree arg
= TREE_VALUE (argtypes
);
13569 tree ret
= TREE_TYPE (TREE_TYPE (decl
));
13570 if (methodp
|| TYPE_REF_P (arg
))
13571 arg
= TREE_TYPE (arg
);
13572 arg
= TYPE_MAIN_VARIANT (arg
);
13574 if (operator_code
== PREINCREMENT_EXPR
13575 || operator_code
== PREDECREMENT_EXPR
)
13577 if (!TYPE_REF_P (ret
)
13578 || !same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (ret
)), arg
))
13579 warning_at (loc
, OPT_Weffc__
, "prefix %qD should return %qT", decl
,
13580 build_reference_type (arg
));
13584 if (!same_type_p (TYPE_MAIN_VARIANT (ret
), arg
))
13585 warning_at (loc
, OPT_Weffc__
,
13586 "postfix %qD should return %qT", decl
, arg
);
13590 /* Effective C++ rule 23. */
13591 if (!DECL_ASSIGNMENT_OPERATOR_P (decl
)
13592 && (operator_code
== PLUS_EXPR
13593 || operator_code
== MINUS_EXPR
13594 || operator_code
== TRUNC_DIV_EXPR
13595 || operator_code
== MULT_EXPR
13596 || operator_code
== TRUNC_MOD_EXPR
)
13597 && TYPE_REF_P (TREE_TYPE (TREE_TYPE (decl
))))
13598 warning_at (loc
, OPT_Weffc__
, "%qD should return by value", decl
);
13603 /* Return a string giving the keyword associate with CODE. */
13605 static const char *
13606 tag_name (enum tag_types code
)
13618 case typename_type
:
13621 gcc_unreachable ();
13625 /* Name lookup in an elaborated-type-specifier (after the keyword
13626 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
13627 elaborated-type-specifier is invalid, issue a diagnostic and return
13628 error_mark_node; otherwise, return the *_TYPE to which it referred.
13629 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
13632 check_elaborated_type_specifier (enum tag_types tag_code
,
13634 bool allow_template_p
)
13640 struct S { struct S *p; };
13642 name lookup will find the TYPE_DECL for the implicit "S::S"
13643 typedef. Adjust for that here. */
13644 if (DECL_SELF_REFERENCE_P (decl
))
13645 decl
= TYPE_NAME (TREE_TYPE (decl
));
13647 type
= TREE_TYPE (decl
);
13649 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
13650 is false for this case as well. */
13651 if (TREE_CODE (type
) == TEMPLATE_TYPE_PARM
)
13653 error ("using template type parameter %qT after %qs",
13654 type
, tag_name (tag_code
));
13655 return error_mark_node
;
13657 /* Accept template template parameters. */
13658 else if (allow_template_p
13659 && (TREE_CODE (type
) == BOUND_TEMPLATE_TEMPLATE_PARM
13660 || TREE_CODE (type
) == TEMPLATE_TEMPLATE_PARM
))
13664 If the identifier resolves to a typedef-name or the
13665 simple-template-id resolves to an alias template
13666 specialization, the elaborated-type-specifier is ill-formed.
13668 In other words, the only legitimate declaration to use in the
13669 elaborated type specifier is the implicit typedef created when
13670 the type is declared. */
13671 else if (!DECL_IMPLICIT_TYPEDEF_P (decl
)
13672 && !DECL_SELF_REFERENCE_P (decl
)
13673 && tag_code
!= typename_type
)
13675 if (alias_template_specialization_p (type
))
13676 error ("using alias template specialization %qT after %qs",
13677 type
, tag_name (tag_code
));
13679 error ("using typedef-name %qD after %qs", decl
, tag_name (tag_code
));
13680 inform (DECL_SOURCE_LOCATION (decl
),
13681 "%qD has a previous declaration here", decl
);
13682 return error_mark_node
;
13684 else if (TREE_CODE (type
) != RECORD_TYPE
13685 && TREE_CODE (type
) != UNION_TYPE
13686 && tag_code
!= enum_type
13687 && tag_code
!= typename_type
)
13689 error ("%qT referred to as %qs", type
, tag_name (tag_code
));
13690 inform (location_of (type
), "%qT has a previous declaration here", type
);
13691 return error_mark_node
;
13693 else if (TREE_CODE (type
) != ENUMERAL_TYPE
13694 && tag_code
== enum_type
)
13696 error ("%qT referred to as enum", type
);
13697 inform (location_of (type
), "%qT has a previous declaration here", type
);
13698 return error_mark_node
;
13700 else if (!allow_template_p
13701 && TREE_CODE (type
) == RECORD_TYPE
13702 && CLASSTYPE_IS_TEMPLATE (type
))
13704 /* If a class template appears as elaborated type specifier
13705 without a template header such as:
13707 template <class T> class C {};
13708 void f(class C); // No template header here
13710 then the required template argument is missing. */
13711 error ("template argument required for %<%s %T%>",
13712 tag_name (tag_code
),
13713 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type
)));
13714 return error_mark_node
;
13720 /* Lookup NAME in elaborate type specifier in scope according to
13721 SCOPE and issue diagnostics if necessary.
13722 Return *_TYPE node upon success, NULL_TREE when the NAME is not
13723 found, and ERROR_MARK_NODE for type error. */
13726 lookup_and_check_tag (enum tag_types tag_code
, tree name
,
13727 tag_scope scope
, bool template_header_p
)
13731 if (scope
== ts_global
)
13733 /* First try ordinary name lookup, ignoring hidden class name
13734 injected via friend declaration. */
13735 decl
= lookup_name_prefer_type (name
, 2);
13736 decl
= strip_using_decl (decl
);
13737 /* If that fails, the name will be placed in the smallest
13738 non-class, non-function-prototype scope according to 3.3.1/5.
13739 We may already have a hidden name declared as friend in this
13740 scope. So lookup again but not ignoring hidden names.
13741 If we find one, that name will be made visible rather than
13742 creating a new tag. */
13744 decl
= lookup_type_scope (name
, ts_within_enclosing_non_class
);
13747 decl
= lookup_type_scope (name
, scope
);
13750 && (DECL_CLASS_TEMPLATE_P (decl
)
13751 /* If scope is ts_current we're defining a class, so ignore a
13752 template template parameter. */
13753 || (scope
!= ts_current
13754 && DECL_TEMPLATE_TEMPLATE_PARM_P (decl
))))
13755 decl
= DECL_TEMPLATE_RESULT (decl
);
13757 if (decl
&& TREE_CODE (decl
) == TYPE_DECL
)
13759 /* Look for invalid nested type:
13763 if (scope
== ts_current
&& DECL_SELF_REFERENCE_P (decl
))
13765 error ("%qD has the same name as the class in which it is "
13768 return error_mark_node
;
13771 /* Two cases we need to consider when deciding if a class
13772 template is allowed as an elaborated type specifier:
13773 1. It is a self reference to its own class.
13774 2. It comes with a template header.
13778 template <class T> class C {
13779 class C *c1; // DECL_SELF_REFERENCE_P is true
13782 template <class U> class C; // template_header_p is true
13783 template <class T> class C<T>::D {
13784 class C *c2; // DECL_SELF_REFERENCE_P is true
13787 t
= check_elaborated_type_specifier (tag_code
,
13790 | DECL_SELF_REFERENCE_P (decl
));
13791 if (template_header_p
&& t
&& CLASS_TYPE_P (t
)
13792 && (!CLASSTYPE_TEMPLATE_INFO (t
)
13793 || (!PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (t
)))))
13795 error ("%qT is not a template", t
);
13796 inform (location_of (t
), "previous declaration here");
13797 if (TYPE_CLASS_SCOPE_P (t
)
13798 && CLASSTYPE_TEMPLATE_INFO (TYPE_CONTEXT (t
)))
13799 inform (input_location
,
13800 "perhaps you want to explicitly add %<%T::%>",
13802 t
= error_mark_node
;
13807 else if (decl
&& TREE_CODE (decl
) == TREE_LIST
)
13809 error ("reference to %qD is ambiguous", name
);
13810 print_candidates (decl
);
13811 return error_mark_node
;
13817 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
13818 Define the tag as a forward-reference if it is not defined.
13820 If a declaration is given, process it here, and report an error if
13821 multiple declarations are not identical.
13823 SCOPE is TS_CURRENT when this is also a definition. Only look in
13824 the current frame for the name (since C++ allows new names in any
13825 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
13826 declaration. Only look beginning from the current scope outward up
13827 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
13829 TEMPLATE_HEADER_P is true when this declaration is preceded by
13830 a set of template parameters. */
13833 xref_tag_1 (enum tag_types tag_code
, tree name
,
13834 tag_scope scope
, bool template_header_p
)
13836 enum tree_code code
;
13837 tree context
= NULL_TREE
;
13839 gcc_assert (identifier_p (name
));
13845 code
= RECORD_TYPE
;
13851 code
= ENUMERAL_TYPE
;
13854 gcc_unreachable ();
13857 /* In case of anonymous name, xref_tag is only called to
13858 make type node and push name. Name lookup is not required. */
13859 tree t
= NULL_TREE
;
13860 if (scope
!= ts_lambda
&& !anon_aggrname_p (name
))
13861 t
= lookup_and_check_tag (tag_code
, name
, scope
, template_header_p
);
13863 if (t
== error_mark_node
)
13864 return error_mark_node
;
13866 if (scope
!= ts_current
&& t
&& current_class_type
13867 && template_class_depth (current_class_type
)
13868 && template_header_p
)
13870 if (TREE_CODE (t
) == TEMPLATE_TEMPLATE_PARM
)
13873 /* Since SCOPE is not TS_CURRENT, we are not looking at a
13874 definition of this tag. Since, in addition, we are currently
13875 processing a (member) template declaration of a template
13876 class, we must be very careful; consider:
13878 template <class X> struct S1
13880 template <class U> struct S2
13882 template <class V> friend struct S1;
13885 Here, the S2::S1 declaration should not be confused with the
13886 outer declaration. In particular, the inner version should
13887 have a template parameter of level 2, not level 1.
13889 On the other hand, when presented with:
13891 template <class T> struct S1
13893 template <class U> struct S2 {};
13894 template <class U> friend struct S2;
13897 the friend must find S1::S2 eventually. We accomplish this
13898 by making sure that the new type we create to represent this
13899 declaration has the right TYPE_CONTEXT. */
13900 context
= TYPE_CONTEXT (t
);
13906 /* If no such tag is yet defined, create a forward-reference node
13907 and record it as the "definition".
13908 When a real declaration of this type is found,
13909 the forward-reference will be altered into a real type. */
13910 if (code
== ENUMERAL_TYPE
)
13912 error ("use of enum %q#D without previous declaration", name
);
13913 return error_mark_node
;
13917 t
= make_class_type (code
);
13918 TYPE_CONTEXT (t
) = context
;
13919 if (scope
== ts_lambda
)
13921 /* Mark it as a lambda type. */
13922 CLASSTYPE_LAMBDA_EXPR (t
) = error_mark_node
;
13923 /* And push it into current scope. */
13924 scope
= ts_current
;
13926 t
= pushtag (name
, t
, scope
);
13931 if (template_header_p
&& MAYBE_CLASS_TYPE_P (t
))
13933 /* Check that we aren't trying to overload a class with different
13935 tree constr
= NULL_TREE
;
13936 if (current_template_parms
)
13938 tree reqs
= TEMPLATE_PARMS_CONSTRAINTS (current_template_parms
);
13939 constr
= build_constraints (reqs
, NULL_TREE
);
13941 if (!redeclare_class_template (t
, current_template_parms
, constr
))
13942 return error_mark_node
;
13944 else if (!processing_template_decl
13945 && CLASS_TYPE_P (t
)
13946 && CLASSTYPE_IS_TEMPLATE (t
))
13948 error ("redeclaration of %qT as a non-template", t
);
13949 inform (location_of (t
), "previous declaration %qD", t
);
13950 return error_mark_node
;
13953 if (scope
!= ts_within_enclosing_non_class
&& TYPE_HIDDEN_P (t
))
13955 /* This is no longer an invisible friend. Make it
13957 tree decl
= TYPE_NAME (t
);
13959 DECL_ANTICIPATED (decl
) = false;
13960 DECL_FRIEND_P (decl
) = false;
13962 if (TYPE_TEMPLATE_INFO (t
))
13964 tree tmpl
= TYPE_TI_TEMPLATE (t
);
13965 DECL_ANTICIPATED (tmpl
) = false;
13966 DECL_FRIEND_P (tmpl
) = false;
13974 /* Wrapper for xref_tag_1. */
13977 xref_tag (enum tag_types tag_code
, tree name
,
13978 tag_scope scope
, bool template_header_p
)
13982 subtime
= timevar_cond_start (TV_NAME_LOOKUP
);
13983 ret
= xref_tag_1 (tag_code
, name
, scope
, template_header_p
);
13984 timevar_cond_stop (TV_NAME_LOOKUP
, subtime
);
13990 xref_tag_from_type (tree old
, tree id
, tag_scope scope
)
13992 enum tag_types tag_kind
;
13994 if (TREE_CODE (old
) == RECORD_TYPE
)
13995 tag_kind
= (CLASSTYPE_DECLARED_CLASS (old
) ? class_type
: record_type
);
13997 tag_kind
= union_type
;
13999 if (id
== NULL_TREE
)
14000 id
= TYPE_IDENTIFIER (old
);
14002 return xref_tag (tag_kind
, id
, scope
, false);
14005 /* Create the binfo hierarchy for REF with (possibly NULL) base list
14006 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
14007 access_* node, and the TREE_VALUE is the type of the base-class.
14008 Non-NULL TREE_TYPE indicates virtual inheritance. */
14011 xref_basetypes (tree ref
, tree base_list
)
14014 tree binfo
, base_binfo
;
14015 unsigned max_vbases
= 0; /* Maximum direct & indirect virtual bases. */
14016 unsigned max_bases
= 0; /* Maximum direct bases. */
14017 unsigned max_dvbases
= 0; /* Maximum direct virtual bases. */
14019 tree default_access
;
14020 tree igo_prev
; /* Track Inheritance Graph Order. */
14022 if (ref
== error_mark_node
)
14025 /* The base of a derived class is private by default, all others are
14027 default_access
= (TREE_CODE (ref
) == RECORD_TYPE
14028 && CLASSTYPE_DECLARED_CLASS (ref
)
14029 ? access_private_node
: access_public_node
);
14031 /* First, make sure that any templates in base-classes are
14032 instantiated. This ensures that if we call ourselves recursively
14033 we do not get confused about which classes are marked and which
14035 basep
= &base_list
;
14038 tree basetype
= TREE_VALUE (*basep
);
14040 /* The dependent_type_p call below should really be dependent_scope_p
14041 so that we give a hard error about using an incomplete type as a
14042 base, but we allow it with a pedwarn for backward
14044 if (processing_template_decl
14045 && CLASS_TYPE_P (basetype
) && TYPE_BEING_DEFINED (basetype
))
14046 cxx_incomplete_type_diagnostic (NULL_TREE
, basetype
, DK_PEDWARN
);
14047 if (!dependent_type_p (basetype
)
14048 && !complete_type_or_else (basetype
, NULL
))
14049 /* An incomplete type. Remove it from the list. */
14050 *basep
= TREE_CHAIN (*basep
);
14054 if (TREE_TYPE (*basep
))
14056 if (CLASS_TYPE_P (basetype
))
14057 max_vbases
+= vec_safe_length (CLASSTYPE_VBASECLASSES (basetype
));
14058 basep
= &TREE_CHAIN (*basep
);
14061 max_vbases
+= max_dvbases
;
14063 TYPE_MARKED_P (ref
) = 1;
14065 /* The binfo slot should be empty, unless this is an (ill-formed)
14067 gcc_assert (!TYPE_BINFO (ref
) || TYPE_SIZE (ref
));
14069 gcc_assert (TYPE_MAIN_VARIANT (ref
) == ref
);
14071 binfo
= make_tree_binfo (max_bases
);
14073 TYPE_BINFO (ref
) = binfo
;
14074 BINFO_OFFSET (binfo
) = size_zero_node
;
14075 BINFO_TYPE (binfo
) = ref
;
14077 /* Apply base-class info set up to the variants of this type. */
14078 fixup_type_variants (ref
);
14082 vec_alloc (BINFO_BASE_ACCESSES (binfo
), max_bases
);
14083 /* A C++98 POD cannot have base classes. */
14084 CLASSTYPE_NON_LAYOUT_POD_P (ref
) = true;
14086 if (TREE_CODE (ref
) == UNION_TYPE
)
14088 error ("derived union %qT invalid", ref
);
14094 warning (OPT_Wmultiple_inheritance
,
14095 "%qT defined with multiple direct bases", ref
);
14099 /* An aggregate can't have virtual base classes. */
14100 CLASSTYPE_NON_AGGREGATE (ref
) = true;
14102 vec_alloc (CLASSTYPE_VBASECLASSES (ref
), max_vbases
);
14105 warning (OPT_Wvirtual_inheritance
,
14106 "%qT defined with direct virtual base", ref
);
14109 for (igo_prev
= binfo
; base_list
; base_list
= TREE_CHAIN (base_list
))
14111 tree access
= TREE_PURPOSE (base_list
);
14112 int via_virtual
= TREE_TYPE (base_list
) != NULL_TREE
;
14113 tree basetype
= TREE_VALUE (base_list
);
14115 if (access
== access_default_node
)
14116 access
= default_access
;
14118 /* Before C++17, an aggregate cannot have base classes. In C++17, an
14119 aggregate can't have virtual, private, or protected base classes. */
14120 if (cxx_dialect
< cxx17
14121 || access
!= access_public_node
14123 CLASSTYPE_NON_AGGREGATE (ref
) = true;
14125 if (PACK_EXPANSION_P (basetype
))
14126 basetype
= PACK_EXPANSION_PATTERN (basetype
);
14127 if (TREE_CODE (basetype
) == TYPE_DECL
)
14128 basetype
= TREE_TYPE (basetype
);
14129 if (!MAYBE_CLASS_TYPE_P (basetype
) || TREE_CODE (basetype
) == UNION_TYPE
)
14131 error ("base type %qT fails to be a struct or class type",
14136 base_binfo
= NULL_TREE
;
14137 if (CLASS_TYPE_P (basetype
) && !dependent_scope_p (basetype
))
14139 base_binfo
= TYPE_BINFO (basetype
);
14140 /* The original basetype could have been a typedef'd type. */
14141 basetype
= BINFO_TYPE (base_binfo
);
14143 /* Inherit flags from the base. */
14144 TYPE_HAS_NEW_OPERATOR (ref
)
14145 |= TYPE_HAS_NEW_OPERATOR (basetype
);
14146 TYPE_HAS_ARRAY_NEW_OPERATOR (ref
)
14147 |= TYPE_HAS_ARRAY_NEW_OPERATOR (basetype
);
14148 TYPE_GETS_DELETE (ref
) |= TYPE_GETS_DELETE (basetype
);
14149 TYPE_HAS_CONVERSION (ref
) |= TYPE_HAS_CONVERSION (basetype
);
14150 CLASSTYPE_DIAMOND_SHAPED_P (ref
)
14151 |= CLASSTYPE_DIAMOND_SHAPED_P (basetype
);
14152 CLASSTYPE_REPEATED_BASE_P (ref
)
14153 |= CLASSTYPE_REPEATED_BASE_P (basetype
);
14156 /* We must do this test after we've seen through a typedef
14158 if (TYPE_MARKED_P (basetype
))
14160 if (basetype
== ref
)
14161 error ("recursive type %qT undefined", basetype
);
14163 error ("duplicate base type %qT invalid", basetype
);
14167 if (PACK_EXPANSION_P (TREE_VALUE (base_list
)))
14168 /* Regenerate the pack expansion for the bases. */
14169 basetype
= make_pack_expansion (basetype
);
14171 TYPE_MARKED_P (basetype
) = 1;
14173 base_binfo
= copy_binfo (base_binfo
, basetype
, ref
,
14174 &igo_prev
, via_virtual
);
14175 if (!BINFO_INHERITANCE_CHAIN (base_binfo
))
14176 BINFO_INHERITANCE_CHAIN (base_binfo
) = binfo
;
14178 BINFO_BASE_APPEND (binfo
, base_binfo
);
14179 BINFO_BASE_ACCESS_APPEND (binfo
, access
);
14183 /* Update max_vbases to reflect the reality that we are dropping
14184 this base: if it reaches zero we want to undo the vec_alloc
14185 above to avoid inconsistencies during error-recovery: eg, in
14186 build_special_member_call, CLASSTYPE_VBASECLASSES non null
14187 and vtt null (c++/27952). */
14190 if (CLASS_TYPE_P (basetype
))
14192 -= vec_safe_length (CLASSTYPE_VBASECLASSES (basetype
));
14195 if (CLASSTYPE_VBASECLASSES (ref
)
14196 && max_vbases
== 0)
14197 vec_free (CLASSTYPE_VBASECLASSES (ref
));
14199 if (vec_safe_length (CLASSTYPE_VBASECLASSES (ref
)) < max_vbases
)
14200 /* If we didn't get max_vbases vbases, we must have shared at
14201 least one of them, and are therefore diamond shaped. */
14202 CLASSTYPE_DIAMOND_SHAPED_P (ref
) = 1;
14204 /* Unmark all the types. */
14205 for (i
= 0; BINFO_BASE_ITERATE (binfo
, i
, base_binfo
); i
++)
14206 TYPE_MARKED_P (BINFO_TYPE (base_binfo
)) = 0;
14207 TYPE_MARKED_P (ref
) = 0;
14209 /* Now see if we have a repeated base type. */
14210 if (!CLASSTYPE_REPEATED_BASE_P (ref
))
14212 for (base_binfo
= binfo
; base_binfo
;
14213 base_binfo
= TREE_CHAIN (base_binfo
))
14215 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo
)))
14217 CLASSTYPE_REPEATED_BASE_P (ref
) = 1;
14220 TYPE_MARKED_P (BINFO_TYPE (base_binfo
)) = 1;
14222 for (base_binfo
= binfo
; base_binfo
;
14223 base_binfo
= TREE_CHAIN (base_binfo
))
14224 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo
)))
14225 TYPE_MARKED_P (BINFO_TYPE (base_binfo
)) = 0;
14232 /* Copies the enum-related properties from type SRC to type DST.
14233 Used with the underlying type of an enum and the enum itself. */
14235 copy_type_enum (tree dst
, tree src
)
14238 for (t
= dst
; t
; t
= TYPE_NEXT_VARIANT (t
))
14240 TYPE_MIN_VALUE (t
) = TYPE_MIN_VALUE (src
);
14241 TYPE_MAX_VALUE (t
) = TYPE_MAX_VALUE (src
);
14242 TYPE_SIZE (t
) = TYPE_SIZE (src
);
14243 TYPE_SIZE_UNIT (t
) = TYPE_SIZE_UNIT (src
);
14244 SET_TYPE_MODE (dst
, TYPE_MODE (src
));
14245 TYPE_PRECISION (t
) = TYPE_PRECISION (src
);
14246 unsigned valign
= TYPE_ALIGN (src
);
14247 if (TYPE_USER_ALIGN (t
))
14248 valign
= MAX (valign
, TYPE_ALIGN (t
));
14250 TYPE_USER_ALIGN (t
) = TYPE_USER_ALIGN (src
);
14251 SET_TYPE_ALIGN (t
, valign
);
14252 TYPE_UNSIGNED (t
) = TYPE_UNSIGNED (src
);
14256 /* Begin compiling the definition of an enumeration type.
14259 if ENUMTYPE is not NULL_TREE then the type has alredy been found.
14261 UNDERLYING_TYPE is the type that will be used as the storage for
14262 the enumeration type. This should be NULL_TREE if no storage type
14265 ATTRIBUTES are any attributes specified after the enum-key.
14267 SCOPED_ENUM_P is true if this is a scoped enumeration type.
14269 if IS_NEW is not NULL, gets TRUE iff a new type is created.
14271 Returns the type object, as yet incomplete.
14272 Also records info about it so that build_enumerator
14273 may be used to declare the individual values as they are read. */
14276 start_enum (tree name
, tree enumtype
, tree underlying_type
,
14277 tree attributes
, bool scoped_enum_p
, bool *is_new
)
14279 tree prevtype
= NULL_TREE
;
14280 gcc_assert (identifier_p (name
));
14284 /* [C++0x dcl.enum]p5:
14286 If not explicitly specified, the underlying type of a scoped
14287 enumeration type is int. */
14288 if (!underlying_type
&& scoped_enum_p
)
14289 underlying_type
= integer_type_node
;
14291 if (underlying_type
)
14292 underlying_type
= cv_unqualified (underlying_type
);
14294 /* If this is the real definition for a previous forward reference,
14295 fill in the contents in the same object that used to be the
14296 forward reference. */
14298 enumtype
= lookup_and_check_tag (enum_type
, name
,
14299 /*tag_scope=*/ts_current
,
14300 /*template_header_p=*/false);
14302 /* In case of a template_decl, the only check that should be deferred
14303 to instantiation time is the comparison of underlying types. */
14304 if (enumtype
&& TREE_CODE (enumtype
) == ENUMERAL_TYPE
)
14306 if (scoped_enum_p
!= SCOPED_ENUM_P (enumtype
))
14308 error_at (input_location
, "scoped/unscoped mismatch "
14309 "in enum %q#T", enumtype
);
14310 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype
)),
14311 "previous definition here");
14312 enumtype
= error_mark_node
;
14314 else if (ENUM_FIXED_UNDERLYING_TYPE_P (enumtype
) != !! underlying_type
)
14316 error_at (input_location
, "underlying type mismatch "
14317 "in enum %q#T", enumtype
);
14318 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype
)),
14319 "previous definition here");
14320 enumtype
= error_mark_node
;
14322 else if (underlying_type
&& ENUM_UNDERLYING_TYPE (enumtype
)
14323 && !same_type_p (underlying_type
,
14324 ENUM_UNDERLYING_TYPE (enumtype
)))
14326 error_at (input_location
, "different underlying type "
14327 "in enum %q#T", enumtype
);
14328 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype
)),
14329 "previous definition here");
14330 underlying_type
= NULL_TREE
;
14334 if (!enumtype
|| TREE_CODE (enumtype
) != ENUMERAL_TYPE
14335 || processing_template_decl
)
14337 /* In case of error, make a dummy enum to allow parsing to
14339 if (enumtype
== error_mark_node
)
14341 name
= make_anon_name ();
14342 enumtype
= NULL_TREE
;
14345 /* enumtype may be an ENUMERAL_TYPE if this is a redefinition
14346 of an opaque enum, or an opaque enum of an already defined
14347 enumeration (C++11).
14348 In any other case, it'll be NULL_TREE. */
14354 prevtype
= enumtype
;
14356 /* Do not push the decl more than once. */
14358 || TREE_CODE (enumtype
) != ENUMERAL_TYPE
)
14360 enumtype
= cxx_make_type (ENUMERAL_TYPE
);
14361 enumtype
= pushtag (name
, enumtype
, /*tag_scope=*/ts_current
);
14363 /* std::byte aliases anything. */
14364 if (enumtype
!= error_mark_node
14365 && TYPE_CONTEXT (enumtype
) == std_node
14366 && !strcmp ("byte", TYPE_NAME_STRING (enumtype
)))
14367 TYPE_ALIAS_SET (enumtype
) = 0;
14370 enumtype
= xref_tag (enum_type
, name
, /*tag_scope=*/ts_current
,
14373 if (enumtype
== error_mark_node
)
14374 return error_mark_node
;
14376 /* The enum is considered opaque until the opening '{' of the
14377 enumerator list. */
14378 SET_OPAQUE_ENUM_P (enumtype
, true);
14379 ENUM_FIXED_UNDERLYING_TYPE_P (enumtype
) = !! underlying_type
;
14382 SET_SCOPED_ENUM_P (enumtype
, scoped_enum_p
);
14384 cplus_decl_attributes (&enumtype
, attributes
, (int)ATTR_FLAG_TYPE_IN_PLACE
);
14386 if (underlying_type
)
14388 if (ENUM_UNDERLYING_TYPE (enumtype
))
14389 /* We already checked that it matches, don't change it to a different
14390 typedef variant. */;
14391 else if (CP_INTEGRAL_TYPE_P (underlying_type
))
14393 copy_type_enum (enumtype
, underlying_type
);
14394 ENUM_UNDERLYING_TYPE (enumtype
) = underlying_type
;
14396 else if (dependent_type_p (underlying_type
))
14397 ENUM_UNDERLYING_TYPE (enumtype
) = underlying_type
;
14399 error ("underlying type %qT of %qT must be an integral type",
14400 underlying_type
, enumtype
);
14403 /* If into a template class, the returned enum is always the first
14404 declaration (opaque or not) seen. This way all the references to
14405 this type will be to the same declaration. The following ones are used
14406 only to check for definition errors. */
14407 if (prevtype
&& processing_template_decl
)
14413 /* After processing and defining all the values of an enumeration type,
14414 install their decls in the enumeration type.
14415 ENUMTYPE is the type object. */
14418 finish_enum_value_list (tree enumtype
)
14421 tree underlying_type
;
14424 tree minnode
, maxnode
;
14427 bool fixed_underlying_type_p
14428 = ENUM_UNDERLYING_TYPE (enumtype
) != NULL_TREE
;
14430 /* We built up the VALUES in reverse order. */
14431 TYPE_VALUES (enumtype
) = nreverse (TYPE_VALUES (enumtype
));
14433 /* For an enum defined in a template, just set the type of the values;
14434 all further processing is postponed until the template is
14435 instantiated. We need to set the type so that tsubst of a CONST_DECL
14437 if (processing_template_decl
)
14439 for (values
= TYPE_VALUES (enumtype
);
14441 values
= TREE_CHAIN (values
))
14442 TREE_TYPE (TREE_VALUE (values
)) = enumtype
;
14446 /* Determine the minimum and maximum values of the enumerators. */
14447 if (TYPE_VALUES (enumtype
))
14449 minnode
= maxnode
= NULL_TREE
;
14451 for (values
= TYPE_VALUES (enumtype
);
14453 values
= TREE_CHAIN (values
))
14455 decl
= TREE_VALUE (values
);
14457 /* [dcl.enum]: Following the closing brace of an enum-specifier,
14458 each enumerator has the type of its enumeration. Prior to the
14459 closing brace, the type of each enumerator is the type of its
14460 initializing value. */
14461 TREE_TYPE (decl
) = enumtype
;
14463 /* Update the minimum and maximum values, if appropriate. */
14464 value
= DECL_INITIAL (decl
);
14465 if (value
== error_mark_node
)
14466 value
= integer_zero_node
;
14467 /* Figure out what the minimum and maximum values of the
14468 enumerators are. */
14470 minnode
= maxnode
= value
;
14471 else if (tree_int_cst_lt (maxnode
, value
))
14473 else if (tree_int_cst_lt (value
, minnode
))
14480 If the enumerator-list is empty, the underlying type is as if
14481 the enumeration had a single enumerator with value 0. */
14482 minnode
= maxnode
= integer_zero_node
;
14484 if (!fixed_underlying_type_p
)
14486 /* Compute the number of bits require to represent all values of the
14487 enumeration. We must do this before the type of MINNODE and
14488 MAXNODE are transformed, since tree_int_cst_min_precision relies
14489 on the TREE_TYPE of the value it is passed. */
14490 signop sgn
= tree_int_cst_sgn (minnode
) >= 0 ? UNSIGNED
: SIGNED
;
14491 int lowprec
= tree_int_cst_min_precision (minnode
, sgn
);
14492 int highprec
= tree_int_cst_min_precision (maxnode
, sgn
);
14493 int precision
= MAX (lowprec
, highprec
);
14495 bool use_short_enum
;
14497 /* Determine the underlying type of the enumeration.
14501 The underlying type of an enumeration is an integral type that
14502 can represent all the enumerator values defined in the
14503 enumeration. It is implementation-defined which integral type is
14504 used as the underlying type for an enumeration except that the
14505 underlying type shall not be larger than int unless the value of
14506 an enumerator cannot fit in an int or unsigned int.
14508 We use "int" or an "unsigned int" as the underlying type, even if
14509 a smaller integral type would work, unless the user has
14510 explicitly requested that we use the smallest possible type. The
14511 user can request that for all enumerations with a command line
14512 flag, or for just one enumeration with an attribute. */
14514 use_short_enum
= flag_short_enums
14515 || lookup_attribute ("packed", TYPE_ATTRIBUTES (enumtype
));
14517 /* If the precision of the type was specified with an attribute and it
14518 was too small, give an error. Otherwise, use it. */
14519 if (TYPE_PRECISION (enumtype
))
14521 if (precision
> TYPE_PRECISION (enumtype
))
14522 error ("specified mode too small for enumeral values");
14525 use_short_enum
= true;
14526 precision
= TYPE_PRECISION (enumtype
);
14530 for (itk
= (use_short_enum
? itk_char
: itk_int
);
14534 underlying_type
= integer_types
[itk
];
14535 if (underlying_type
!= NULL_TREE
14536 && TYPE_PRECISION (underlying_type
) >= precision
14537 && TYPE_SIGN (underlying_type
) == sgn
)
14540 if (itk
== itk_none
)
14544 IF no integral type can represent all the enumerator values, the
14545 enumeration is ill-formed. */
14546 error ("no integral type can represent all of the enumerator values "
14547 "for %qT", enumtype
);
14548 precision
= TYPE_PRECISION (long_long_integer_type_node
);
14549 underlying_type
= integer_types
[itk_unsigned_long_long
];
14554 The value of sizeof() applied to an enumeration type, an object
14555 of an enumeration type, or an enumerator, is the value of sizeof()
14556 applied to the underlying type. */
14557 copy_type_enum (enumtype
, underlying_type
);
14559 /* Compute the minimum and maximum values for the type.
14563 For an enumeration where emin is the smallest enumerator and emax
14564 is the largest, the values of the enumeration are the values of the
14565 underlying type in the range bmin to bmax, where bmin and bmax are,
14566 respectively, the smallest and largest values of the smallest bit-
14567 field that can store emin and emax. */
14569 /* The middle-end currently assumes that types with TYPE_PRECISION
14570 narrower than their underlying type are suitably zero or sign
14571 extended to fill their mode. Similarly, it assumes that the front
14572 end assures that a value of a particular type must be within
14573 TYPE_MIN_VALUE and TYPE_MAX_VALUE.
14575 We used to set these fields based on bmin and bmax, but that led
14576 to invalid assumptions like optimizing away bounds checking. So
14577 now we just set the TYPE_PRECISION, TYPE_MIN_VALUE, and
14578 TYPE_MAX_VALUE to the values for the mode above and only restrict
14579 the ENUM_UNDERLYING_TYPE for the benefit of diagnostics. */
14580 ENUM_UNDERLYING_TYPE (enumtype
)
14581 = build_distinct_type_copy (underlying_type
);
14582 TYPE_PRECISION (ENUM_UNDERLYING_TYPE (enumtype
)) = precision
;
14583 set_min_and_max_values_for_integral_type
14584 (ENUM_UNDERLYING_TYPE (enumtype
), precision
, sgn
);
14586 /* If -fstrict-enums, still constrain TYPE_MIN/MAX_VALUE. */
14587 if (flag_strict_enums
)
14588 set_min_and_max_values_for_integral_type (enumtype
, precision
, sgn
);
14591 underlying_type
= ENUM_UNDERLYING_TYPE (enumtype
);
14593 /* Convert each of the enumerators to the type of the underlying
14594 type of the enumeration. */
14595 for (values
= TYPE_VALUES (enumtype
); values
; values
= TREE_CHAIN (values
))
14597 location_t saved_location
;
14599 decl
= TREE_VALUE (values
);
14600 saved_location
= input_location
;
14601 input_location
= DECL_SOURCE_LOCATION (decl
);
14602 if (fixed_underlying_type_p
)
14603 /* If the enumeration type has a fixed underlying type, we
14604 already checked all of the enumerator values. */
14605 value
= DECL_INITIAL (decl
);
14607 value
= perform_implicit_conversion (underlying_type
,
14608 DECL_INITIAL (decl
),
14609 tf_warning_or_error
);
14610 input_location
= saved_location
;
14612 /* Do not clobber shared ints. */
14613 if (value
!= error_mark_node
)
14615 value
= copy_node (value
);
14617 TREE_TYPE (value
) = enumtype
;
14619 DECL_INITIAL (decl
) = value
;
14622 /* Fix up all variant types of this enum type. */
14623 for (t
= TYPE_MAIN_VARIANT (enumtype
); t
; t
= TYPE_NEXT_VARIANT (t
))
14624 TYPE_VALUES (t
) = TYPE_VALUES (enumtype
);
14626 if (at_class_scope_p ()
14627 && COMPLETE_TYPE_P (current_class_type
)
14628 && UNSCOPED_ENUM_P (enumtype
))
14630 insert_late_enum_def_bindings (current_class_type
, enumtype
);
14631 /* TYPE_FIELDS needs fixup. */
14632 fixup_type_variants (current_class_type
);
14635 /* Finish debugging output for this type. */
14636 rest_of_type_compilation (enumtype
, namespace_bindings_p ());
14638 /* Each enumerator now has the type of its enumeration. Clear the cache
14639 so that this change in types doesn't confuse us later on. */
14640 clear_cv_and_fold_caches ();
14643 /* Finishes the enum type. This is called only the first time an
14644 enumeration is seen, be it opaque or odinary.
14645 ENUMTYPE is the type object. */
14648 finish_enum (tree enumtype
)
14650 if (processing_template_decl
)
14652 if (at_function_scope_p ())
14653 add_stmt (build_min (TAG_DEFN
, enumtype
));
14657 /* If this is a forward declaration, there should not be any variants,
14658 though we can get a variant in the middle of an enum-specifier with
14659 wacky code like 'enum E { e = sizeof(const E*) };' */
14660 gcc_assert (enumtype
== TYPE_MAIN_VARIANT (enumtype
)
14661 && (TYPE_VALUES (enumtype
)
14662 || !TYPE_NEXT_VARIANT (enumtype
)));
14665 /* Build and install a CONST_DECL for an enumeration constant of the
14666 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
14667 Apply ATTRIBUTES if available. LOC is the location of NAME.
14668 Assignment of sequential values by default is handled here. */
14671 build_enumerator (tree name
, tree value
, tree enumtype
, tree attributes
,
14678 /* scalar_constant_value will pull out this expression, so make sure
14679 it's folded as appropriate. */
14680 if (processing_template_decl
)
14681 value
= fold_non_dependent_expr (value
);
14683 /* If the VALUE was erroneous, pretend it wasn't there; that will
14684 result in the enum being assigned the next value in sequence. */
14685 if (value
== error_mark_node
)
14688 /* Remove no-op casts from the value. */
14690 STRIP_TYPE_NOPS (value
);
14692 if (! processing_template_decl
)
14694 /* Validate and default VALUE. */
14695 if (value
!= NULL_TREE
)
14697 if (!ENUM_UNDERLYING_TYPE (enumtype
))
14699 tree tmp_value
= build_expr_type_conversion (WANT_INT
| WANT_ENUM
,
14704 else if (! INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P
14705 (TREE_TYPE (value
)))
14706 value
= perform_implicit_conversion_flags
14707 (ENUM_UNDERLYING_TYPE (enumtype
), value
, tf_warning_or_error
,
14708 LOOKUP_IMPLICIT
| LOOKUP_NO_NARROWING
);
14710 if (value
== error_mark_node
)
14713 if (value
!= NULL_TREE
)
14715 if (! INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P
14716 (TREE_TYPE (value
)))
14718 error ("enumerator value for %qD must have integral or "
14719 "unscoped enumeration type", name
);
14724 value
= cxx_constant_value (value
);
14726 if (TREE_CODE (value
) != INTEGER_CST
)
14728 error ("enumerator value for %qD is not an integer "
14736 /* Default based on previous value. */
14737 if (value
== NULL_TREE
)
14739 if (TYPE_VALUES (enumtype
))
14743 /* C++03 7.2/4: If no initializer is specified for the first
14744 enumerator, the type is an unspecified integral
14745 type. Otherwise the type is the same as the type of the
14746 initializing value of the preceding enumerator unless the
14747 incremented value is not representable in that type, in
14748 which case the type is an unspecified integral type
14749 sufficient to contain the incremented value. */
14750 prev_value
= DECL_INITIAL (TREE_VALUE (TYPE_VALUES (enumtype
)));
14751 if (error_operand_p (prev_value
))
14752 value
= error_mark_node
;
14755 wi::overflow_type overflowed
;
14756 tree type
= TREE_TYPE (prev_value
);
14757 signop sgn
= TYPE_SIGN (type
);
14758 widest_int wi
= wi::add (wi::to_widest (prev_value
), 1, sgn
,
14762 bool pos
= !wi::neg_p (wi
, sgn
);
14763 if (!wi::fits_to_tree_p (wi
, type
))
14766 for (itk
= itk_int
; itk
!= itk_none
; itk
++)
14768 type
= integer_types
[itk
];
14769 if (type
!= NULL_TREE
14770 && (pos
|| !TYPE_UNSIGNED (type
))
14771 && wi::fits_to_tree_p (wi
, type
))
14774 if (type
&& cxx_dialect
< cxx11
14775 && itk
> itk_unsigned_long
)
14776 pedwarn (input_location
, OPT_Wlong_long
,
14778 incremented enumerator value is too large for %<unsigned long%>") : G_("\
14779 incremented enumerator value is too large for %<long%>"));
14781 if (type
== NULL_TREE
)
14782 overflowed
= wi::OVF_UNKNOWN
;
14784 value
= wide_int_to_tree (type
, wi
);
14789 error ("overflow in enumeration values at %qD", name
);
14790 value
= error_mark_node
;
14795 value
= integer_zero_node
;
14798 /* Remove no-op casts from the value. */
14799 STRIP_TYPE_NOPS (value
);
14801 /* If the underlying type of the enum is fixed, check whether
14802 the enumerator values fits in the underlying type. If it
14803 does not fit, the program is ill-formed [C++0x dcl.enum]. */
14804 if (ENUM_UNDERLYING_TYPE (enumtype
)
14806 && TREE_CODE (value
) == INTEGER_CST
)
14808 if (!int_fits_type_p (value
, ENUM_UNDERLYING_TYPE (enumtype
)))
14809 error ("enumerator value %qE is outside the range of underlying "
14810 "type %qT", value
, ENUM_UNDERLYING_TYPE (enumtype
));
14812 /* Convert the value to the appropriate type. */
14813 value
= fold_convert (ENUM_UNDERLYING_TYPE (enumtype
), value
);
14817 /* C++ associates enums with global, function, or class declarations. */
14818 context
= current_scope ();
14820 /* Build the actual enumeration constant. Note that the enumeration
14821 constants have the underlying type of the enum (if it is fixed)
14822 or the type of their initializer (if the underlying type of the
14823 enum is not fixed):
14827 If the underlying type is fixed, the type of each enumerator
14828 prior to the closing brace is the underlying type; if the
14829 initializing value of an enumerator cannot be represented by
14830 the underlying type, the program is ill-formed. If the
14831 underlying type is not fixed, the type of each enumerator is
14832 the type of its initializing value.
14834 If the underlying type is not fixed, it will be computed by
14835 finish_enum and we will reset the type of this enumerator. Of
14836 course, if we're processing a template, there may be no value. */
14837 type
= value
? TREE_TYPE (value
) : NULL_TREE
;
14839 decl
= build_decl (loc
, CONST_DECL
, name
, type
);
14841 DECL_CONTEXT (decl
) = enumtype
;
14842 TREE_CONSTANT (decl
) = 1;
14843 TREE_READONLY (decl
) = 1;
14844 DECL_INITIAL (decl
) = value
;
14847 cplus_decl_attributes (&decl
, attributes
, 0);
14849 if (context
&& context
== current_class_type
&& !SCOPED_ENUM_P (enumtype
))
14851 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
14852 on the TYPE_FIELDS list for `S'. (That's so that you can say
14853 things like `S::i' later.) */
14855 /* The enumerator may be getting declared outside of its enclosing
14858 class S { public: enum E : int; }; enum S::E : int { i = 7; };
14860 For which case we need to make sure that the access of `S::i'
14861 matches the access of `S::E'. */
14862 tree saved_cas
= current_access_specifier
;
14863 if (TREE_PRIVATE (TYPE_NAME (enumtype
)))
14864 current_access_specifier
= access_private_node
;
14865 else if (TREE_PROTECTED (TYPE_NAME (enumtype
)))
14866 current_access_specifier
= access_protected_node
;
14868 current_access_specifier
= access_public_node
;
14870 finish_member_declaration (decl
);
14872 current_access_specifier
= saved_cas
;
14877 /* Add this enumeration constant to the list for this type. */
14878 TYPE_VALUES (enumtype
) = tree_cons (name
, decl
, TYPE_VALUES (enumtype
));
14881 /* Look for an enumerator with the given NAME within the enumeration
14882 type ENUMTYPE. This routine is used primarily for qualified name
14883 lookup into an enumerator in C++0x, e.g.,
14885 enum class Color { Red, Green, Blue };
14887 Color color = Color::Red;
14889 Returns the value corresponding to the enumerator, or
14890 NULL_TREE if no such enumerator was found. */
14892 lookup_enumerator (tree enumtype
, tree name
)
14895 gcc_assert (enumtype
&& TREE_CODE (enumtype
) == ENUMERAL_TYPE
);
14897 e
= purpose_member (name
, TYPE_VALUES (enumtype
));
14898 return e
? TREE_VALUE (e
) : NULL_TREE
;
14902 /* We're defining DECL. Make sure that its type is OK. */
14905 check_function_type (tree decl
, tree current_function_parms
)
14907 tree fntype
= TREE_TYPE (decl
);
14908 tree return_type
= complete_type (TREE_TYPE (fntype
));
14910 /* In a function definition, arg types must be complete. */
14911 require_complete_types_for_parms (current_function_parms
);
14913 if (dependent_type_p (return_type
)
14914 || type_uses_auto (return_type
))
14916 if (!COMPLETE_OR_VOID_TYPE_P (return_type
))
14918 tree args
= TYPE_ARG_TYPES (fntype
);
14920 error ("return type %q#T is incomplete", return_type
);
14922 /* Make it return void instead. */
14923 if (TREE_CODE (fntype
) == METHOD_TYPE
)
14924 fntype
= build_method_type_directly (TREE_TYPE (TREE_VALUE (args
)),
14926 TREE_CHAIN (args
));
14928 fntype
= build_function_type (void_type_node
, args
);
14929 fntype
= (cp_build_type_attribute_variant
14930 (fntype
, TYPE_ATTRIBUTES (TREE_TYPE (decl
))));
14931 fntype
= cxx_copy_lang_qualifiers (fntype
, TREE_TYPE (decl
));
14932 TREE_TYPE (decl
) = fntype
;
14936 abstract_virtuals_error (decl
, TREE_TYPE (fntype
));
14937 maybe_warn_parm_abi (TREE_TYPE (fntype
),
14938 DECL_SOURCE_LOCATION (decl
));
14942 /* True iff FN is an implicitly-defined default constructor. */
14945 implicit_default_ctor_p (tree fn
)
14947 return (DECL_CONSTRUCTOR_P (fn
)
14948 && !user_provided_p (fn
)
14949 && sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (fn
)));
14952 /* Clobber the contents of *this to let the back end know that the object
14953 storage is dead when we enter the constructor or leave the destructor. */
14956 build_clobber_this ()
14958 /* Clobbering an empty base is pointless, and harmful if its one byte
14959 TYPE_SIZE overlays real data. */
14960 if (is_empty_class (current_class_type
))
14963 /* If we have virtual bases, clobber the whole object, but only if we're in
14964 charge. If we don't have virtual bases, clobber the as-base type so we
14965 don't mess with tail padding. */
14966 bool vbases
= CLASSTYPE_VBASECLASSES (current_class_type
);
14968 tree ctype
= current_class_type
;
14970 ctype
= CLASSTYPE_AS_BASE (ctype
);
14972 tree clobber
= build_clobber (ctype
);
14974 tree thisref
= current_class_ref
;
14975 if (ctype
!= current_class_type
)
14977 thisref
= build_nop (build_reference_type (ctype
), current_class_ptr
);
14978 thisref
= convert_from_reference (thisref
);
14981 tree exprstmt
= build2 (MODIFY_EXPR
, void_type_node
, thisref
, clobber
);
14983 exprstmt
= build_if_in_charge (exprstmt
);
14988 /* Create the FUNCTION_DECL for a function definition.
14989 DECLSPECS and DECLARATOR are the parts of the declaration;
14990 they describe the function's name and the type it returns,
14991 but twisted together in a fashion that parallels the syntax of C.
14993 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
14994 DECLARATOR is really the DECL for the function we are about to
14995 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
14996 indicating that the function is an inline defined in-class.
14998 This function creates a binding context for the function body
14999 as well as setting up the FUNCTION_DECL in current_function_decl.
15001 For C++, we must first check whether that datum makes any sense.
15002 For example, "class A local_a(1,2);" means that variable local_a
15003 is an aggregate of type A, which should have a constructor
15004 applied to it with the argument list [1, 2].
15006 On entry, DECL_INITIAL (decl1) should be NULL_TREE or error_mark_node,
15007 or may be a BLOCK if the function has been defined previously
15008 in this translation unit. On exit, DECL_INITIAL (decl1) will be
15009 error_mark_node if the function has never been defined, or
15010 a BLOCK if the function has been defined somewhere. */
15013 start_preparsed_function (tree decl1
, tree attrs
, int flags
)
15015 tree ctype
= NULL_TREE
;
15018 int doing_friend
= 0;
15019 cp_binding_level
*bl
;
15020 tree current_function_parms
;
15021 struct c_fileinfo
*finfo
15022 = get_fileinfo (LOCATION_FILE (DECL_SOURCE_LOCATION (decl1
)));
15023 bool honor_interface
;
15025 /* Sanity check. */
15026 gcc_assert (VOID_TYPE_P (TREE_VALUE (void_list_node
)));
15027 gcc_assert (TREE_CHAIN (void_list_node
) == NULL_TREE
);
15029 fntype
= TREE_TYPE (decl1
);
15030 if (TREE_CODE (fntype
) == METHOD_TYPE
)
15031 ctype
= TYPE_METHOD_BASETYPE (fntype
);
15033 /* ISO C++ 11.4/5. A friend function defined in a class is in
15034 the (lexical) scope of the class in which it is defined. */
15035 if (!ctype
&& DECL_FRIEND_P (decl1
))
15037 ctype
= DECL_FRIEND_CONTEXT (decl1
);
15039 /* CTYPE could be null here if we're dealing with a template;
15040 for example, `inline friend float foo()' inside a template
15041 will have no CTYPE set. */
15042 if (ctype
&& TREE_CODE (ctype
) != RECORD_TYPE
)
15048 if (DECL_DECLARED_INLINE_P (decl1
)
15049 && lookup_attribute ("noinline", attrs
))
15050 warning_at (DECL_SOURCE_LOCATION (decl1
), 0,
15051 "inline function %qD given attribute noinline", decl1
);
15053 /* Handle gnu_inline attribute. */
15054 if (GNU_INLINE_P (decl1
))
15056 DECL_EXTERNAL (decl1
) = 1;
15057 DECL_NOT_REALLY_EXTERN (decl1
) = 0;
15058 DECL_INTERFACE_KNOWN (decl1
) = 1;
15059 DECL_DISREGARD_INLINE_LIMITS (decl1
) = 1;
15062 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl1
))
15063 /* This is a constructor, we must ensure that any default args
15064 introduced by this definition are propagated to the clones
15065 now. The clones are used directly in overload resolution. */
15066 adjust_clone_args (decl1
);
15068 /* Sometimes we don't notice that a function is a static member, and
15069 build a METHOD_TYPE for it. Fix that up now. */
15070 gcc_assert (!(ctype
!= NULL_TREE
&& DECL_STATIC_FUNCTION_P (decl1
)
15071 && TREE_CODE (TREE_TYPE (decl1
)) == METHOD_TYPE
));
15073 /* Set up current_class_type, and enter the scope of the class, if
15076 push_nested_class (ctype
);
15077 else if (DECL_STATIC_FUNCTION_P (decl1
))
15078 push_nested_class (DECL_CONTEXT (decl1
));
15080 /* Now that we have entered the scope of the class, we must restore
15081 the bindings for any template parameters surrounding DECL1, if it
15082 is an inline member template. (Order is important; consider the
15083 case where a template parameter has the same name as a field of
15084 the class.) It is not until after this point that
15085 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
15086 if (flags
& SF_INCLASS_INLINE
)
15087 maybe_begin_member_template_processing (decl1
);
15089 /* Effective C++ rule 15. */
15091 && DECL_ASSIGNMENT_OPERATOR_P (decl1
)
15092 && DECL_OVERLOADED_OPERATOR_IS (decl1
, NOP_EXPR
)
15093 && VOID_TYPE_P (TREE_TYPE (fntype
)))
15094 warning (OPT_Weffc__
,
15095 "%<operator=%> should return a reference to %<*this%>");
15097 /* Make the init_value nonzero so pushdecl knows this is not tentative.
15098 error_mark_node is replaced below (in poplevel) with the BLOCK. */
15099 if (!DECL_INITIAL (decl1
))
15100 DECL_INITIAL (decl1
) = error_mark_node
;
15102 /* This function exists in static storage.
15103 (This does not mean `static' in the C sense!) */
15104 TREE_STATIC (decl1
) = 1;
15106 /* We must call push_template_decl after current_class_type is set
15107 up. (If we are processing inline definitions after exiting a
15108 class scope, current_class_type will be NULL_TREE until set above
15109 by push_nested_class.) */
15110 if (processing_template_decl
)
15112 tree newdecl1
= push_template_decl (decl1
);
15113 if (newdecl1
== error_mark_node
)
15115 if (ctype
|| DECL_STATIC_FUNCTION_P (decl1
))
15116 pop_nested_class ();
15122 /* Make sure the parameter and return types are reasonable. When
15123 you declare a function, these types can be incomplete, but they
15124 must be complete when you define the function. */
15125 check_function_type (decl1
, DECL_ARGUMENTS (decl1
));
15127 /* Build the return declaration for the function. */
15128 restype
= TREE_TYPE (fntype
);
15130 if (DECL_RESULT (decl1
) == NULL_TREE
)
15134 resdecl
= build_decl (input_location
, RESULT_DECL
, 0, restype
);
15135 DECL_ARTIFICIAL (resdecl
) = 1;
15136 DECL_IGNORED_P (resdecl
) = 1;
15137 DECL_RESULT (decl1
) = resdecl
;
15139 cp_apply_type_quals_to_decl (cp_type_quals (restype
), resdecl
);
15142 /* Record the decl so that the function name is defined.
15143 If we already have a decl for this name, and it is a FUNCTION_DECL,
15144 use the old decl. */
15145 if (!processing_template_decl
&& !(flags
& SF_PRE_PARSED
))
15147 /* A specialization is not used to guide overload resolution. */
15148 if (!DECL_FUNCTION_MEMBER_P (decl1
)
15149 && !(DECL_USE_TEMPLATE (decl1
) &&
15150 PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl1
))))
15152 tree olddecl
= pushdecl (decl1
);
15154 if (olddecl
== error_mark_node
)
15155 /* If something went wrong when registering the declaration,
15156 use DECL1; we have to have a FUNCTION_DECL to use when
15157 parsing the body of the function. */
15161 /* Otherwise, OLDDECL is either a previous declaration
15162 of the same function or DECL1 itself. */
15164 if (warn_missing_declarations
15165 && olddecl
== decl1
15166 && !DECL_MAIN_P (decl1
)
15167 && TREE_PUBLIC (decl1
)
15168 && !DECL_DECLARED_INLINE_P (decl1
))
15172 /* Check whether DECL1 is in an anonymous
15174 for (context
= DECL_CONTEXT (decl1
);
15176 context
= DECL_CONTEXT (context
))
15178 if (TREE_CODE (context
) == NAMESPACE_DECL
15179 && DECL_NAME (context
) == NULL_TREE
)
15183 if (context
== NULL
)
15184 warning_at (DECL_SOURCE_LOCATION (decl1
),
15185 OPT_Wmissing_declarations
,
15186 "no previous declaration for %qD", decl1
);
15194 /* We need to set the DECL_CONTEXT. */
15195 if (!DECL_CONTEXT (decl1
) && DECL_TEMPLATE_INFO (decl1
))
15196 DECL_CONTEXT (decl1
) = DECL_CONTEXT (DECL_TI_TEMPLATE (decl1
));
15198 fntype
= TREE_TYPE (decl1
);
15199 restype
= TREE_TYPE (fntype
);
15201 /* If #pragma weak applies, mark the decl appropriately now.
15202 The pragma only applies to global functions. Because
15203 determining whether or not the #pragma applies involves
15204 computing the mangled name for the declaration, we cannot
15205 apply the pragma until after we have merged this declaration
15206 with any previous declarations; if the original declaration
15207 has a linkage specification, that specification applies to
15208 the definition as well, and may affect the mangled name. */
15209 if (DECL_FILE_SCOPE_P (decl1
))
15210 maybe_apply_pragma_weak (decl1
);
15213 /* We are now in the scope of the function being defined. */
15214 current_function_decl
= decl1
;
15216 /* Save the parm names or decls from this function's declarator
15217 where store_parm_decls will find them. */
15218 current_function_parms
= DECL_ARGUMENTS (decl1
);
15220 /* Let the user know we're compiling this function. */
15221 announce_function (decl1
);
15223 gcc_assert (DECL_INITIAL (decl1
));
15225 /* This function may already have been parsed, in which case just
15226 return; our caller will skip over the body without parsing. */
15227 if (DECL_INITIAL (decl1
) != error_mark_node
)
15230 /* Initialize RTL machinery. We cannot do this until
15231 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
15232 even when processing a template; this is how we get
15233 CFUN set up, and our per-function variables initialized.
15234 FIXME factor out the non-RTL stuff. */
15235 bl
= current_binding_level
;
15236 allocate_struct_function (decl1
, processing_template_decl
);
15238 /* Initialize the language data structures. Whenever we start
15239 a new function, we destroy temporaries in the usual way. */
15240 cfun
->language
= ggc_cleared_alloc
<language_function
> ();
15241 current_stmt_tree ()->stmts_are_full_exprs_p
= 1;
15242 current_binding_level
= bl
;
15244 if (!processing_template_decl
&& type_uses_auto (restype
))
15246 FNDECL_USED_AUTO (decl1
) = true;
15247 current_function_auto_return_pattern
= restype
;
15250 /* Start the statement-tree, start the tree now. */
15251 DECL_SAVED_TREE (decl1
) = push_stmt_list ();
15253 /* If we are (erroneously) defining a function that we have already
15254 defined before, wipe out what we knew before. */
15255 if (!DECL_PENDING_INLINE_P (decl1
))
15256 DECL_SAVED_FUNCTION_DATA (decl1
) = NULL
;
15258 if (ctype
&& !doing_friend
&& !DECL_STATIC_FUNCTION_P (decl1
))
15260 /* We know that this was set up by `grokclassfn'. We do not
15261 wait until `store_parm_decls', since evil parse errors may
15262 never get us to that point. Here we keep the consistency
15263 between `current_class_type' and `current_class_ptr'. */
15264 tree t
= DECL_ARGUMENTS (decl1
);
15266 gcc_assert (t
!= NULL_TREE
&& TREE_CODE (t
) == PARM_DECL
);
15267 gcc_assert (TYPE_PTR_P (TREE_TYPE (t
)));
15269 cp_function_chain
->x_current_class_ref
15270 = cp_build_fold_indirect_ref (t
);
15271 /* Set this second to avoid shortcut in cp_build_indirect_ref. */
15272 cp_function_chain
->x_current_class_ptr
= t
;
15274 /* Constructors and destructors need to know whether they're "in
15275 charge" of initializing virtual base classes. */
15276 t
= DECL_CHAIN (t
);
15277 if (DECL_HAS_IN_CHARGE_PARM_P (decl1
))
15279 current_in_charge_parm
= t
;
15280 t
= DECL_CHAIN (t
);
15282 if (DECL_HAS_VTT_PARM_P (decl1
))
15284 gcc_assert (DECL_NAME (t
) == vtt_parm_identifier
);
15285 current_vtt_parm
= t
;
15289 honor_interface
= (!DECL_TEMPLATE_INSTANTIATION (decl1
)
15290 /* Implicitly-defined methods (like the
15291 destructor for a class in which no destructor
15292 is explicitly declared) must not be defined
15293 until their definition is needed. So, we
15294 ignore interface specifications for
15295 compiler-generated functions. */
15296 && !DECL_ARTIFICIAL (decl1
));
15298 if (processing_template_decl
)
15299 /* Don't mess with interface flags. */;
15300 else if (DECL_INTERFACE_KNOWN (decl1
))
15302 tree ctx
= decl_function_context (decl1
);
15304 if (DECL_NOT_REALLY_EXTERN (decl1
))
15305 DECL_EXTERNAL (decl1
) = 0;
15307 if (ctx
!= NULL_TREE
&& vague_linkage_p (ctx
))
15308 /* This is a function in a local class in an extern inline
15309 or template function. */
15310 comdat_linkage (decl1
);
15312 /* If this function belongs to an interface, it is public.
15313 If it belongs to someone else's interface, it is also external.
15314 This only affects inlines and template instantiations. */
15315 else if (!finfo
->interface_unknown
&& honor_interface
)
15317 if (DECL_DECLARED_INLINE_P (decl1
)
15318 || DECL_TEMPLATE_INSTANTIATION (decl1
))
15320 DECL_EXTERNAL (decl1
)
15321 = (finfo
->interface_only
15322 || (DECL_DECLARED_INLINE_P (decl1
)
15323 && ! flag_implement_inlines
15324 && !DECL_VINDEX (decl1
)));
15326 /* For WIN32 we also want to put these in linkonce sections. */
15327 maybe_make_one_only (decl1
);
15330 DECL_EXTERNAL (decl1
) = 0;
15331 DECL_INTERFACE_KNOWN (decl1
) = 1;
15332 /* If this function is in an interface implemented in this file,
15333 make sure that the back end knows to emit this function
15335 if (!DECL_EXTERNAL (decl1
))
15336 mark_needed (decl1
);
15338 else if (finfo
->interface_unknown
&& finfo
->interface_only
15339 && honor_interface
)
15341 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
15342 interface, we will have both finfo->interface_unknown and
15343 finfo->interface_only set. In that case, we don't want to
15344 use the normal heuristics because someone will supply a
15345 #pragma implementation elsewhere, and deducing it here would
15346 produce a conflict. */
15347 comdat_linkage (decl1
);
15348 DECL_EXTERNAL (decl1
) = 0;
15349 DECL_INTERFACE_KNOWN (decl1
) = 1;
15350 DECL_DEFER_OUTPUT (decl1
) = 1;
15354 /* This is a definition, not a reference.
15355 So clear DECL_EXTERNAL, unless this is a GNU extern inline. */
15356 if (!GNU_INLINE_P (decl1
))
15357 DECL_EXTERNAL (decl1
) = 0;
15359 if ((DECL_DECLARED_INLINE_P (decl1
)
15360 || DECL_TEMPLATE_INSTANTIATION (decl1
))
15361 && ! DECL_INTERFACE_KNOWN (decl1
))
15362 DECL_DEFER_OUTPUT (decl1
) = 1;
15364 DECL_INTERFACE_KNOWN (decl1
) = 1;
15367 /* Determine the ELF visibility attribute for the function. We must not
15368 do this before calling "pushdecl", as we must allow "duplicate_decls"
15369 to merge any attributes appropriately. We also need to wait until
15371 if (!DECL_CLONED_FUNCTION_P (decl1
))
15372 determine_visibility (decl1
);
15374 if (!processing_template_decl
)
15375 maybe_instantiate_noexcept (decl1
);
15377 begin_scope (sk_function_parms
, decl1
);
15381 if (DECL_DESTRUCTOR_P (decl1
)
15382 || (DECL_CONSTRUCTOR_P (decl1
)
15383 && targetm
.cxx
.cdtor_returns_this ()))
15385 cdtor_label
= create_artificial_label (input_location
);
15386 LABEL_DECL_CDTOR (cdtor_label
) = true;
15389 start_fname_decls ();
15391 store_parm_decls (current_function_parms
);
15393 if (!processing_template_decl
15394 && (flag_lifetime_dse
> 1)
15395 && DECL_CONSTRUCTOR_P (decl1
)
15396 && !DECL_CLONED_FUNCTION_P (decl1
)
15397 /* Clobbering an empty base is harmful if it overlays real data. */
15398 && !is_empty_class (current_class_type
)
15399 /* We can't clobber safely for an implicitly-defined default constructor
15400 because part of the initialization might happen before we enter the
15401 constructor, via AGGR_INIT_ZERO_FIRST (c++/68006). */
15402 && !implicit_default_ctor_p (decl1
))
15403 finish_expr_stmt (build_clobber_this ());
15405 if (!processing_template_decl
15406 && DECL_CONSTRUCTOR_P (decl1
)
15407 && sanitize_flags_p (SANITIZE_VPTR
)
15408 && !DECL_CLONED_FUNCTION_P (decl1
)
15409 && !implicit_default_ctor_p (decl1
))
15410 cp_ubsan_maybe_initialize_vtbl_ptrs (current_class_ptr
);
15412 start_lambda_scope (decl1
);
15418 /* Like start_preparsed_function, except that instead of a
15419 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
15421 Returns true on success. If the DECLARATOR is not suitable
15422 for a function, we return false, which tells the parser to
15423 skip the entire function. */
15426 start_function (cp_decl_specifier_seq
*declspecs
,
15427 const cp_declarator
*declarator
,
15432 decl1
= grokdeclarator (declarator
, declspecs
, FUNCDEF
, 1, &attrs
);
15433 invoke_plugin_callbacks (PLUGIN_START_PARSE_FUNCTION
, decl1
);
15434 if (decl1
== error_mark_node
)
15436 /* If the declarator is not suitable for a function definition,
15437 cause a syntax error. */
15438 if (decl1
== NULL_TREE
|| TREE_CODE (decl1
) != FUNCTION_DECL
)
15440 error ("invalid function declaration");
15444 if (DECL_MAIN_P (decl1
))
15445 /* main must return int. grokfndecl should have corrected it
15446 (and issued a diagnostic) if the user got it wrong. */
15447 gcc_assert (same_type_p (TREE_TYPE (TREE_TYPE (decl1
)),
15448 integer_type_node
));
15450 return start_preparsed_function (decl1
, attrs
, /*flags=*/SF_DEFAULT
);
15453 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
15457 use_eh_spec_block (tree fn
)
15459 return (flag_exceptions
&& flag_enforce_eh_specs
15460 && !processing_template_decl
15461 && !type_throw_all_p (TREE_TYPE (fn
))
15462 /* We insert the EH_SPEC_BLOCK only in the original
15463 function; then, it is copied automatically to the
15465 && !DECL_CLONED_FUNCTION_P (fn
)
15466 /* Implicitly-generated constructors and destructors have
15467 exception specifications. However, those specifications
15468 are the union of the possible exceptions specified by the
15469 constructors/destructors for bases and members, so no
15470 unallowed exception will ever reach this function. By
15471 not creating the EH_SPEC_BLOCK we save a little memory,
15472 and we avoid spurious warnings about unreachable
15474 && !DECL_DEFAULTED_FN (fn
));
15477 /* Store the parameter declarations into the current function declaration.
15478 This is called after parsing the parameter declarations, before
15479 digesting the body of the function.
15481 Also install to binding contour return value identifier, if any. */
15484 store_parm_decls (tree current_function_parms
)
15486 tree fndecl
= current_function_decl
;
15489 /* This is a chain of any other decls that came in among the parm
15490 declarations. If a parm is declared with enum {foo, bar} x;
15491 then CONST_DECLs for foo and bar are put here. */
15492 tree nonparms
= NULL_TREE
;
15494 if (current_function_parms
)
15496 /* This case is when the function was defined with an ANSI prototype.
15497 The parms already have decls, so we need not do anything here
15498 except record them as in effect
15499 and complain if any redundant old-style parm decls were written. */
15501 tree specparms
= current_function_parms
;
15504 /* Must clear this because it might contain TYPE_DECLs declared
15506 current_binding_level
->names
= NULL
;
15508 /* If we're doing semantic analysis, then we'll call pushdecl
15509 for each of these. We must do them in reverse order so that
15510 they end in the correct forward order. */
15511 specparms
= nreverse (specparms
);
15513 for (parm
= specparms
; parm
; parm
= next
)
15515 next
= DECL_CHAIN (parm
);
15516 if (TREE_CODE (parm
) == PARM_DECL
)
15520 /* If we find an enum constant or a type tag,
15521 put it aside for the moment. */
15522 TREE_CHAIN (parm
) = NULL_TREE
;
15523 nonparms
= chainon (nonparms
, parm
);
15527 /* Get the decls in their original chain order and record in the
15528 function. This is all and only the PARM_DECLs that were
15529 pushed into scope by the loop above. */
15530 DECL_ARGUMENTS (fndecl
) = get_local_decls ();
15533 DECL_ARGUMENTS (fndecl
) = NULL_TREE
;
15535 /* Now store the final chain of decls for the arguments
15536 as the decl-chain of the current lexical scope.
15537 Put the enumerators in as well, at the front so that
15538 DECL_ARGUMENTS is not modified. */
15539 current_binding_level
->names
= chainon (nonparms
, DECL_ARGUMENTS (fndecl
));
15541 if (use_eh_spec_block (current_function_decl
))
15542 current_eh_spec_block
= begin_eh_spec_block ();
15546 /* We have finished doing semantic analysis on DECL, but have not yet
15547 generated RTL for its body. Save away our current state, so that
15548 when we want to generate RTL later we know what to do. */
15551 save_function_data (tree decl
)
15553 struct language_function
*f
;
15555 /* Save the language-specific per-function data so that we can
15556 get it back when we really expand this function. */
15557 gcc_assert (!DECL_PENDING_INLINE_P (decl
));
15560 f
= ggc_alloc
<language_function
> ();
15561 memcpy (f
, cp_function_chain
, sizeof (struct language_function
));
15562 DECL_SAVED_FUNCTION_DATA (decl
) = f
;
15564 /* Clear out the bits we don't need. */
15565 f
->base
.x_stmt_tree
.x_cur_stmt_list
= NULL
;
15566 f
->bindings
= NULL
;
15567 f
->x_local_names
= NULL
;
15568 f
->base
.local_typedefs
= NULL
;
15572 /* Set the return value of the constructor (if present). */
15575 finish_constructor_body (void)
15580 if (targetm
.cxx
.cdtor_returns_this ())
15582 /* Any return from a constructor will end up here. */
15583 add_stmt (build_stmt (input_location
, LABEL_EXPR
, cdtor_label
));
15585 val
= DECL_ARGUMENTS (current_function_decl
);
15586 val
= build2 (MODIFY_EXPR
, TREE_TYPE (val
),
15587 DECL_RESULT (current_function_decl
), val
);
15588 /* Return the address of the object. */
15589 exprstmt
= build_stmt (input_location
, RETURN_EXPR
, val
);
15590 add_stmt (exprstmt
);
15594 /* Do all the processing for the beginning of a destructor; set up the
15595 vtable pointers and cleanups for bases and members. */
15598 begin_destructor_body (void)
15600 tree compound_stmt
;
15602 /* If the CURRENT_CLASS_TYPE is incomplete, we will have already
15603 issued an error message. We still want to try to process the
15604 body of the function, but initialize_vtbl_ptrs will crash if
15605 TYPE_BINFO is NULL. */
15606 if (COMPLETE_TYPE_P (current_class_type
))
15608 compound_stmt
= begin_compound_stmt (0);
15609 /* Make all virtual function table pointers in non-virtual base
15610 classes point to CURRENT_CLASS_TYPE's virtual function
15612 initialize_vtbl_ptrs (current_class_ptr
);
15613 finish_compound_stmt (compound_stmt
);
15615 if (flag_lifetime_dse
15616 /* Clobbering an empty base is harmful if it overlays real data. */
15617 && !is_empty_class (current_class_type
))
15619 if (sanitize_flags_p (SANITIZE_VPTR
)
15620 && (flag_sanitize_recover
& SANITIZE_VPTR
) == 0
15621 && TYPE_CONTAINS_VPTR_P (current_class_type
))
15623 tree binfo
= TYPE_BINFO (current_class_type
);
15625 = cp_build_fold_indirect_ref (current_class_ptr
);
15627 tree vtbl_ptr
= build_vfield_ref (ref
, TREE_TYPE (binfo
));
15628 tree vtbl
= build_zero_cst (TREE_TYPE (vtbl_ptr
));
15629 tree stmt
= cp_build_modify_expr (input_location
, vtbl_ptr
,
15631 tf_warning_or_error
);
15632 finish_decl_cleanup (NULL_TREE
, stmt
);
15635 finish_decl_cleanup (NULL_TREE
, build_clobber_this ());
15638 /* And insert cleanups for our bases and members so that they
15639 will be properly destroyed if we throw. */
15640 push_base_cleanups ();
15644 /* At the end of every destructor we generate code to delete the object if
15645 necessary. Do that now. */
15648 finish_destructor_body (void)
15652 /* Any return from a destructor will end up here; that way all base
15653 and member cleanups will be run when the function returns. */
15654 add_stmt (build_stmt (input_location
, LABEL_EXPR
, cdtor_label
));
15656 if (targetm
.cxx
.cdtor_returns_this ())
15660 val
= DECL_ARGUMENTS (current_function_decl
);
15661 val
= build2 (MODIFY_EXPR
, TREE_TYPE (val
),
15662 DECL_RESULT (current_function_decl
), val
);
15663 /* Return the address of the object. */
15664 exprstmt
= build_stmt (input_location
, RETURN_EXPR
, val
);
15665 add_stmt (exprstmt
);
15669 /* Do the necessary processing for the beginning of a function body, which
15670 in this case includes member-initializers, but not the catch clauses of
15671 a function-try-block. Currently, this means opening a binding level
15672 for the member-initializers (in a ctor), member cleanups (in a dtor),
15673 and capture proxies (in a lambda operator()). */
15676 begin_function_body (void)
15680 if (! FUNCTION_NEEDS_BODY_BLOCK (current_function_decl
))
15683 if (processing_template_decl
)
15684 /* Do nothing now. */;
15686 /* Always keep the BLOCK node associated with the outermost pair of
15687 curly braces of a function. These are needed for correct
15688 operation of dwarfout.c. */
15689 keep_next_level (true);
15691 stmt
= begin_compound_stmt (BCS_FN_BODY
);
15693 if (processing_template_decl
)
15694 /* Do nothing now. */;
15695 else if (DECL_DESTRUCTOR_P (current_function_decl
))
15696 begin_destructor_body ();
15701 /* Do the processing for the end of a function body. Currently, this means
15702 closing out the cleanups for fully-constructed bases and members, and in
15703 the case of the destructor, deleting the object if desired. Again, this
15704 is only meaningful for [cd]tors, since they are the only functions where
15705 there is a significant distinction between the main body and any
15706 function catch clauses. Handling, say, main() return semantics here
15707 would be wrong, as flowing off the end of a function catch clause for
15708 main() would also need to return 0. */
15711 finish_function_body (tree compstmt
)
15713 if (compstmt
== NULL_TREE
)
15716 /* Close the block. */
15717 finish_compound_stmt (compstmt
);
15719 if (processing_template_decl
)
15720 /* Do nothing now. */;
15721 else if (DECL_CONSTRUCTOR_P (current_function_decl
))
15722 finish_constructor_body ();
15723 else if (DECL_DESTRUCTOR_P (current_function_decl
))
15724 finish_destructor_body ();
15727 /* Given a function, returns the BLOCK corresponding to the outermost level
15728 of curly braces, skipping the artificial block created for constructor
15732 outer_curly_brace_block (tree fndecl
)
15734 tree block
= DECL_INITIAL (fndecl
);
15735 if (BLOCK_OUTER_CURLY_BRACE_P (block
))
15737 block
= BLOCK_SUBBLOCKS (block
);
15738 if (BLOCK_OUTER_CURLY_BRACE_P (block
))
15740 block
= BLOCK_SUBBLOCKS (block
);
15741 gcc_assert (BLOCK_OUTER_CURLY_BRACE_P (block
));
15745 /* If FNDECL is a class's key method, add the class to the list of
15746 keyed classes that should be emitted. */
15749 record_key_method_defined (tree fndecl
)
15751 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fndecl
)
15752 && DECL_VIRTUAL_P (fndecl
)
15753 && !processing_template_decl
)
15755 tree fnclass
= DECL_CONTEXT (fndecl
);
15756 if (fndecl
== CLASSTYPE_KEY_METHOD (fnclass
))
15757 vec_safe_push (keyed_classes
, fnclass
);
15761 /* Subroutine of finish_function.
15762 Save the body of constexpr functions for possible
15763 future compile time evaluation. */
15766 maybe_save_function_definition (tree fun
)
15768 if (!processing_template_decl
15769 && DECL_DECLARED_CONSTEXPR_P (fun
)
15770 && !cp_function_chain
->invalid_constexpr
15771 && !DECL_CLONED_FUNCTION_P (fun
))
15772 register_constexpr_fundef (fun
, DECL_SAVED_TREE (fun
));
15775 /* Attempt to add a fix-it hint to RICHLOC suggesting the insertion
15776 of "return *this;" immediately before its location, using FNDECL's
15777 first statement (if any) to give the indentation, if appropriate. */
15780 add_return_star_this_fixit (gcc_rich_location
*richloc
, tree fndecl
)
15782 location_t indent
= UNKNOWN_LOCATION
;
15783 tree stmts
= expr_first (DECL_SAVED_TREE (fndecl
));
15785 indent
= EXPR_LOCATION (stmts
);
15786 richloc
->add_fixit_insert_formatted ("return *this;",
15787 richloc
->get_loc (),
15791 /* Finish up a function declaration and compile that function
15792 all the way to assembler language output. The free the storage
15793 for the function definition. INLINE_P is TRUE if we just
15794 finished processing the body of an in-class inline function
15795 definition. (This processing will have taken place after the
15796 class definition is complete.) */
15799 finish_function (bool inline_p
)
15801 tree fndecl
= current_function_decl
;
15802 tree fntype
, ctype
= NULL_TREE
;
15804 /* When we get some parse errors, we can end up without a
15805 current_function_decl, so cope. */
15806 if (fndecl
== NULL_TREE
)
15807 return error_mark_node
;
15809 finish_lambda_scope ();
15811 if (c_dialect_objc ())
15812 objc_finish_function ();
15814 record_key_method_defined (fndecl
);
15816 fntype
= TREE_TYPE (fndecl
);
15818 /* TREE_READONLY (fndecl) = 1;
15819 This caused &foo to be of type ptr-to-const-function
15820 which then got a warning when stored in a ptr-to-function variable. */
15822 gcc_assert (building_stmt_list_p ());
15823 /* The current function is being defined, so its DECL_INITIAL should
15824 be set, and unless there's a multiple definition, it should be
15825 error_mark_node. */
15826 gcc_assert (DECL_INITIAL (fndecl
) == error_mark_node
);
15828 /* For a cloned function, we've already got all the code we need;
15829 there's no need to add any extra bits. */
15830 if (!DECL_CLONED_FUNCTION_P (fndecl
))
15832 /* Make it so that `main' always returns 0 by default. */
15833 if (DECL_MAIN_P (current_function_decl
))
15834 finish_return_stmt (integer_zero_node
);
15836 if (use_eh_spec_block (current_function_decl
))
15837 finish_eh_spec_block (TYPE_RAISES_EXCEPTIONS
15838 (TREE_TYPE (current_function_decl
)),
15839 current_eh_spec_block
);
15842 /* If we're saving up tree structure, tie off the function now. */
15843 DECL_SAVED_TREE (fndecl
) = pop_stmt_list (DECL_SAVED_TREE (fndecl
));
15845 finish_fname_decls ();
15847 /* If this function can't throw any exceptions, remember that. */
15848 if (!processing_template_decl
15849 && !cp_function_chain
->can_throw
15850 && !flag_non_call_exceptions
15851 && !decl_replaceable_p (fndecl
))
15852 TREE_NOTHROW (fndecl
) = 1;
15854 /* This must come after expand_function_end because cleanups might
15855 have declarations (from inline functions) that need to go into
15856 this function's blocks. */
15858 /* If the current binding level isn't the outermost binding level
15859 for this function, either there is a bug, or we have experienced
15860 syntax errors and the statement tree is malformed. */
15861 if (current_binding_level
->kind
!= sk_function_parms
)
15863 /* Make sure we have already experienced errors. */
15864 gcc_assert (errorcount
);
15866 /* Throw away the broken statement tree and extra binding
15868 DECL_SAVED_TREE (fndecl
) = alloc_stmt_list ();
15870 while (current_binding_level
->kind
!= sk_function_parms
)
15872 if (current_binding_level
->kind
== sk_class
)
15873 pop_nested_class ();
15875 poplevel (0, 0, 0);
15878 poplevel (1, 0, 1);
15880 /* Statements should always be full-expressions at the outermost set
15881 of curly braces for a function. */
15882 gcc_assert (stmts_are_full_exprs_p ());
15884 /* If there are no return statements in a function with auto return type,
15885 the return type is void. But if the declared type is something like
15886 auto*, this is an error. */
15887 if (!processing_template_decl
&& FNDECL_USED_AUTO (fndecl
)
15888 && TREE_TYPE (fntype
) == current_function_auto_return_pattern
)
15890 if (is_auto (current_function_auto_return_pattern
))
15892 apply_deduced_return_type (fndecl
, void_type_node
);
15893 fntype
= TREE_TYPE (fndecl
);
15895 else if (!current_function_returns_value
15896 && !current_function_returns_null
)
15898 error ("no return statements in function returning %qT",
15899 current_function_auto_return_pattern
);
15900 inform (input_location
, "only plain %<auto%> return type can be "
15901 "deduced to %<void%>");
15905 // If this is a concept, check that the definition is reasonable.
15906 if (DECL_DECLARED_CONCEPT_P (fndecl
))
15907 check_function_concept (fndecl
);
15909 /* Lambda closure members are implicitly constexpr if possible. */
15910 if (cxx_dialect
>= cxx17
15911 && LAMBDA_TYPE_P (CP_DECL_CONTEXT (fndecl
)))
15912 DECL_DECLARED_CONSTEXPR_P (fndecl
)
15913 = ((processing_template_decl
15914 || is_valid_constexpr_fn (fndecl
, /*complain*/false))
15915 && potential_constant_expression (DECL_SAVED_TREE (fndecl
)));
15917 /* Save constexpr function body before it gets munged by
15918 the NRV transformation. */
15919 maybe_save_function_definition (fndecl
);
15921 /* Invoke the pre-genericize plugin before we start munging things. */
15922 if (!processing_template_decl
)
15923 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE
, fndecl
);
15925 /* Perform delayed folding before NRV transformation. */
15926 if (!processing_template_decl
)
15927 cp_fold_function (fndecl
);
15929 /* Set up the named return value optimization, if we can. Candidate
15930 variables are selected in check_return_expr. */
15931 if (current_function_return_value
)
15933 tree r
= current_function_return_value
;
15936 if (r
!= error_mark_node
15937 /* This is only worth doing for fns that return in memory--and
15938 simpler, since we don't have to worry about promoted modes. */
15939 && aggregate_value_p (TREE_TYPE (TREE_TYPE (fndecl
)), fndecl
)
15940 /* Only allow this for variables declared in the outer scope of
15941 the function so we know that their lifetime always ends with a
15942 return; see g++.dg/opt/nrv6.C. We could be more flexible if
15943 we were to do this optimization in tree-ssa. */
15944 && (outer
= outer_curly_brace_block (fndecl
))
15945 && chain_member (r
, BLOCK_VARS (outer
)))
15946 finalize_nrv (&DECL_SAVED_TREE (fndecl
), r
, DECL_RESULT (fndecl
));
15948 current_function_return_value
= NULL_TREE
;
15951 /* Remember that we were in class scope. */
15952 if (current_class_name
)
15953 ctype
= current_class_type
;
15955 /* Must mark the RESULT_DECL as being in this function. */
15956 DECL_CONTEXT (DECL_RESULT (fndecl
)) = fndecl
;
15958 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
15959 to the FUNCTION_DECL node itself. */
15960 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl
)) = fndecl
;
15962 /* Save away current state, if appropriate. */
15963 if (!processing_template_decl
)
15964 save_function_data (fndecl
);
15966 /* Complain if there's just no return statement. */
15967 if (warn_return_type
15968 && !VOID_TYPE_P (TREE_TYPE (fntype
))
15969 && !dependent_type_p (TREE_TYPE (fntype
))
15970 && !current_function_returns_value
&& !current_function_returns_null
15971 /* Don't complain if we abort or throw. */
15972 && !current_function_returns_abnormally
15973 /* Don't complain if there's an infinite loop. */
15974 && !current_function_infinite_loop
15975 /* Don't complain if we are declared noreturn. */
15976 && !TREE_THIS_VOLATILE (fndecl
)
15977 && !DECL_NAME (DECL_RESULT (fndecl
))
15978 && !TREE_NO_WARNING (fndecl
)
15979 /* Structor return values (if any) are set by the compiler. */
15980 && !DECL_CONSTRUCTOR_P (fndecl
)
15981 && !DECL_DESTRUCTOR_P (fndecl
)
15982 && targetm
.warn_func_return (fndecl
))
15984 gcc_rich_location
richloc (input_location
);
15985 /* Potentially add a "return *this;" fix-it hint for
15986 assignment operators. */
15987 if (IDENTIFIER_ASSIGN_OP_P (DECL_NAME (fndecl
)))
15989 tree valtype
= TREE_TYPE (DECL_RESULT (fndecl
));
15990 if (TREE_CODE (valtype
) == REFERENCE_TYPE
15991 && same_type_ignoring_top_level_qualifiers_p
15992 (TREE_TYPE (valtype
), TREE_TYPE (current_class_ref
)))
15993 if (global_dc
->option_enabled (OPT_Wreturn_type
,
15994 global_dc
->option_state
))
15995 add_return_star_this_fixit (&richloc
, fndecl
);
15997 warning_at (&richloc
, OPT_Wreturn_type
,
15998 "no return statement in function returning non-void");
15999 TREE_NO_WARNING (fndecl
) = 1;
16002 /* Store the end of the function, so that we get good line number
16003 info for the epilogue. */
16004 cfun
->function_end_locus
= input_location
;
16006 /* Complain about parameters that are only set, but never otherwise used. */
16007 if (warn_unused_but_set_parameter
16008 && !processing_template_decl
16009 && errorcount
== unused_but_set_errorcount
16010 && !DECL_CLONED_FUNCTION_P (fndecl
))
16014 for (decl
= DECL_ARGUMENTS (fndecl
);
16016 decl
= DECL_CHAIN (decl
))
16017 if (TREE_USED (decl
)
16018 && TREE_CODE (decl
) == PARM_DECL
16019 && !DECL_READ_P (decl
)
16020 && DECL_NAME (decl
)
16021 && !DECL_ARTIFICIAL (decl
)
16022 && !TREE_NO_WARNING (decl
)
16023 && !DECL_IN_SYSTEM_HEADER (decl
)
16024 && TREE_TYPE (decl
) != error_mark_node
16025 && !TYPE_REF_P (TREE_TYPE (decl
))
16026 && (!CLASS_TYPE_P (TREE_TYPE (decl
))
16027 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl
))))
16028 warning_at (DECL_SOURCE_LOCATION (decl
),
16029 OPT_Wunused_but_set_parameter
,
16030 "parameter %qD set but not used", decl
);
16031 unused_but_set_errorcount
= errorcount
;
16034 /* Complain about locally defined typedefs that are not used in this
16036 maybe_warn_unused_local_typedefs ();
16038 /* Possibly warn about unused parameters. */
16039 if (warn_unused_parameter
16040 && !processing_template_decl
16041 && !DECL_CLONED_FUNCTION_P (fndecl
))
16042 do_warn_unused_parameter (fndecl
);
16044 /* Genericize before inlining. */
16045 if (!processing_template_decl
)
16047 struct language_function
*f
= DECL_SAVED_FUNCTION_DATA (fndecl
);
16048 cp_genericize (fndecl
);
16049 /* Clear out the bits we don't need. */
16050 f
->x_current_class_ptr
= NULL
;
16051 f
->x_current_class_ref
= NULL
;
16052 f
->x_eh_spec_block
= NULL
;
16053 f
->x_in_charge_parm
= NULL
;
16054 f
->x_vtt_parm
= NULL
;
16055 f
->x_return_value
= NULL
;
16056 f
->bindings
= NULL
;
16057 f
->extern_decl_map
= NULL
;
16058 f
->infinite_loops
= NULL
;
16060 /* Clear out the bits we don't need. */
16061 local_names
= NULL
;
16063 /* We're leaving the context of this function, so zap cfun. It's still in
16064 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
16066 current_function_decl
= NULL
;
16068 /* If this is an in-class inline definition, we may have to pop the
16069 bindings for the template parameters that we added in
16070 maybe_begin_member_template_processing when start_function was
16073 maybe_end_member_template_processing ();
16075 /* Leave the scope of the class. */
16077 pop_nested_class ();
16082 current_function_decl
= NULL_TREE
;
16084 invoke_plugin_callbacks (PLUGIN_FINISH_PARSE_FUNCTION
, fndecl
);
16088 /* Create the FUNCTION_DECL for a function definition.
16089 DECLSPECS and DECLARATOR are the parts of the declaration;
16090 they describe the return type and the name of the function,
16091 but twisted together in a fashion that parallels the syntax of C.
16093 This function creates a binding context for the function body
16094 as well as setting up the FUNCTION_DECL in current_function_decl.
16096 Returns a FUNCTION_DECL on success.
16098 If the DECLARATOR is not suitable for a function (it defines a datum
16099 instead), we return 0, which tells yyparse to report a parse error.
16101 May return void_type_node indicating that this method is actually
16102 a friend. See grokfield for more details.
16104 Came here with a `.pushlevel' .
16106 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
16107 CHANGES TO CODE IN `grokfield'. */
16110 grokmethod (cp_decl_specifier_seq
*declspecs
,
16111 const cp_declarator
*declarator
, tree attrlist
)
16113 tree fndecl
= grokdeclarator (declarator
, declspecs
, MEMFUNCDEF
, 0,
16116 if (fndecl
== error_mark_node
)
16117 return error_mark_node
;
16119 if (fndecl
== NULL
|| TREE_CODE (fndecl
) != FUNCTION_DECL
)
16121 error ("invalid member function declaration");
16122 return error_mark_node
;
16126 cplus_decl_attributes (&fndecl
, attrlist
, 0);
16128 /* Pass friends other than inline friend functions back. */
16129 if (fndecl
== void_type_node
)
16132 if (DECL_IN_AGGR_P (fndecl
))
16134 if (DECL_CLASS_SCOPE_P (fndecl
))
16135 error ("%qD is already defined in class %qT", fndecl
,
16136 DECL_CONTEXT (fndecl
));
16137 return error_mark_node
;
16140 check_template_shadow (fndecl
);
16142 if (TREE_PUBLIC (fndecl
))
16143 DECL_COMDAT (fndecl
) = 1;
16144 DECL_DECLARED_INLINE_P (fndecl
) = 1;
16145 DECL_NO_INLINE_WARNING_P (fndecl
) = 1;
16147 /* We process method specializations in finish_struct_1. */
16148 if (processing_template_decl
&& !DECL_TEMPLATE_SPECIALIZATION (fndecl
))
16150 fndecl
= push_template_decl (fndecl
);
16151 if (fndecl
== error_mark_node
)
16155 if (! DECL_FRIEND_P (fndecl
))
16157 if (DECL_CHAIN (fndecl
))
16159 fndecl
= copy_node (fndecl
);
16160 TREE_CHAIN (fndecl
) = NULL_TREE
;
16164 cp_finish_decl (fndecl
, NULL_TREE
, false, NULL_TREE
, 0);
16166 DECL_IN_AGGR_P (fndecl
) = 1;
16171 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
16172 we can lay it out later, when and if its type becomes complete.
16174 Also handle constexpr variables where the initializer involves
16175 an unlowered PTRMEM_CST because the class isn't complete yet. */
16178 maybe_register_incomplete_var (tree var
)
16180 gcc_assert (VAR_P (var
));
16182 /* Keep track of variables with incomplete types. */
16183 if (!processing_template_decl
&& TREE_TYPE (var
) != error_mark_node
16184 && DECL_EXTERNAL (var
))
16186 tree inner_type
= TREE_TYPE (var
);
16188 while (TREE_CODE (inner_type
) == ARRAY_TYPE
)
16189 inner_type
= TREE_TYPE (inner_type
);
16190 inner_type
= TYPE_MAIN_VARIANT (inner_type
);
16192 if ((!COMPLETE_TYPE_P (inner_type
) && CLASS_TYPE_P (inner_type
))
16193 /* RTTI TD entries are created while defining the type_info. */
16194 || (TYPE_LANG_SPECIFIC (inner_type
)
16195 && TYPE_BEING_DEFINED (inner_type
)))
16197 incomplete_var iv
= {var
, inner_type
};
16198 vec_safe_push (incomplete_vars
, iv
);
16200 else if (!(DECL_LANG_SPECIFIC (var
) && DECL_TEMPLATE_INFO (var
))
16201 && decl_constant_var_p (var
)
16202 && (TYPE_PTRMEM_P (inner_type
) || CLASS_TYPE_P (inner_type
)))
16204 /* When the outermost open class is complete we can resolve any
16205 pointers-to-members. */
16206 tree context
= outermost_open_class ();
16207 incomplete_var iv
= {var
, context
};
16208 vec_safe_push (incomplete_vars
, iv
);
16213 /* Called when a class type (given by TYPE) is defined. If there are
16214 any existing VAR_DECLs whose type has been completed by this
16215 declaration, update them now. */
16218 complete_vars (tree type
)
16221 incomplete_var
*iv
;
16223 for (ix
= 0; vec_safe_iterate (incomplete_vars
, ix
, &iv
); )
16225 if (same_type_p (type
, iv
->incomplete_type
))
16227 tree var
= iv
->decl
;
16228 tree type
= TREE_TYPE (var
);
16230 if (type
!= error_mark_node
16231 && (TYPE_MAIN_VARIANT (strip_array_types (type
))
16232 == iv
->incomplete_type
))
16234 /* Complete the type of the variable. The VAR_DECL itself
16235 will be laid out in expand_expr. */
16236 complete_type (type
);
16237 cp_apply_type_quals_to_decl (cp_type_quals (type
), var
);
16240 /* Remove this entry from the list. */
16241 incomplete_vars
->unordered_remove (ix
);
16247 /* Check for pending declarations which may have abstract type. */
16248 complete_type_check_abstract (type
);
16251 /* If DECL is of a type which needs a cleanup, build and return an
16252 expression to perform that cleanup here. Return NULL_TREE if no
16253 cleanup need be done. DECL can also be a _REF when called from
16254 split_nonconstant_init_1. */
16257 cxx_maybe_build_cleanup (tree decl
, tsubst_flags_t complain
)
16263 /* Assume no cleanup is required. */
16264 cleanup
= NULL_TREE
;
16266 if (error_operand_p (decl
))
16269 /* Handle "__attribute__((cleanup))". We run the cleanup function
16270 before the destructor since the destructor is what actually
16271 terminates the lifetime of the object. */
16273 attr
= lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl
));
16282 /* Get the name specified by the user for the cleanup function. */
16283 id
= TREE_VALUE (TREE_VALUE (attr
));
16284 /* Look up the name to find the cleanup function to call. It is
16285 important to use lookup_name here because that is what is
16286 used in c-common.c:handle_cleanup_attribute when performing
16287 initial checks on the attribute. Note that those checks
16288 include ensuring that the function found is not an overloaded
16289 function, or an object with an overloaded call operator,
16290 etc.; we can rely on the fact that the function found is an
16291 ordinary FUNCTION_DECL. */
16292 fn
= lookup_name (id
);
16293 arg
= build_address (decl
);
16294 if (!mark_used (decl
, complain
) && !(complain
& tf_error
))
16295 return error_mark_node
;
16296 cleanup
= cp_build_function_call_nary (fn
, complain
, arg
, NULL_TREE
);
16297 if (cleanup
== error_mark_node
)
16298 return error_mark_node
;
16300 /* Handle ordinary C++ destructors. */
16301 type
= TREE_TYPE (decl
);
16302 if (type_build_dtor_call (type
))
16304 int flags
= LOOKUP_NORMAL
|LOOKUP_NONVIRTUAL
|LOOKUP_DESTRUCTOR
;
16308 if (TREE_CODE (type
) == ARRAY_TYPE
)
16311 addr
= build_address (decl
);
16313 call
= build_delete (TREE_TYPE (addr
), addr
,
16314 sfk_complete_destructor
, flags
, 0, complain
);
16315 if (call
== error_mark_node
)
16316 cleanup
= error_mark_node
;
16317 else if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type
))
16318 /* Discard the call. */;
16320 cleanup
= cp_build_compound_expr (cleanup
, call
, complain
);
16325 /* build_delete sets the location of the destructor call to the
16326 current location, even though the destructor is going to be
16327 called later, at the end of the current scope. This can lead to
16328 a "jumpy" behavior for users of debuggers when they step around
16329 the end of the block. So let's unset the location of the
16330 destructor call instead. */
16331 protected_set_expr_location (cleanup
, UNKNOWN_LOCATION
);
16335 && !lookup_attribute ("warn_unused", TYPE_ATTRIBUTES (TREE_TYPE (decl
)))
16336 /* Treat objects with destructors as used; the destructor may do
16337 something substantive. */
16338 && !mark_used (decl
, complain
) && !(complain
& tf_error
))
16339 return error_mark_node
;
16345 /* Return the FUNCTION_TYPE that corresponds to MEMFNTYPE, which can be a
16346 FUNCTION_DECL, METHOD_TYPE, FUNCTION_TYPE, pointer or reference to
16347 METHOD_TYPE or FUNCTION_TYPE, or pointer to member function. */
16350 static_fn_type (tree memfntype
)
16355 if (TYPE_PTRMEMFUNC_P (memfntype
))
16356 memfntype
= TYPE_PTRMEMFUNC_FN_TYPE (memfntype
);
16357 if (INDIRECT_TYPE_P (memfntype
)
16358 || TREE_CODE (memfntype
) == FUNCTION_DECL
)
16359 memfntype
= TREE_TYPE (memfntype
);
16360 if (TREE_CODE (memfntype
) == FUNCTION_TYPE
)
16362 gcc_assert (TREE_CODE (memfntype
) == METHOD_TYPE
);
16363 args
= TYPE_ARG_TYPES (memfntype
);
16364 fntype
= build_function_type (TREE_TYPE (memfntype
), TREE_CHAIN (args
));
16365 fntype
= apply_memfn_quals (fntype
, type_memfn_quals (memfntype
));
16366 fntype
= (cp_build_type_attribute_variant
16367 (fntype
, TYPE_ATTRIBUTES (memfntype
)));
16368 fntype
= cxx_copy_lang_qualifiers (fntype
, memfntype
);
16372 /* DECL was originally constructed as a non-static member function,
16373 but turned out to be static. Update it accordingly. */
16376 revert_static_member_fn (tree decl
)
16378 tree stype
= static_fn_type (decl
);
16379 cp_cv_quals quals
= type_memfn_quals (stype
);
16380 cp_ref_qualifier rqual
= type_memfn_rqual (stype
);
16382 if (quals
!= TYPE_UNQUALIFIED
|| rqual
!= REF_QUAL_NONE
)
16383 stype
= apply_memfn_quals (stype
, TYPE_UNQUALIFIED
, REF_QUAL_NONE
);
16385 TREE_TYPE (decl
) = stype
;
16387 if (DECL_ARGUMENTS (decl
))
16388 DECL_ARGUMENTS (decl
) = DECL_CHAIN (DECL_ARGUMENTS (decl
));
16389 DECL_STATIC_FUNCTION_P (decl
) = 1;
16392 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
16393 one of the language-independent trees. */
16395 enum cp_tree_node_structure_enum
16396 cp_tree_node_structure (union lang_tree_node
* t
)
16398 switch (TREE_CODE (&t
->generic
))
16400 case DEFAULT_ARG
: return TS_CP_DEFAULT_ARG
;
16401 case DEFERRED_NOEXCEPT
: return TS_CP_DEFERRED_NOEXCEPT
;
16402 case IDENTIFIER_NODE
: return TS_CP_IDENTIFIER
;
16403 case OVERLOAD
: return TS_CP_OVERLOAD
;
16404 case TEMPLATE_PARM_INDEX
: return TS_CP_TPI
;
16405 case PTRMEM_CST
: return TS_CP_PTRMEM
;
16406 case BASELINK
: return TS_CP_BASELINK
;
16407 case TEMPLATE_DECL
: return TS_CP_TEMPLATE_DECL
;
16408 case STATIC_ASSERT
: return TS_CP_STATIC_ASSERT
;
16409 case ARGUMENT_PACK_SELECT
: return TS_CP_ARGUMENT_PACK_SELECT
;
16410 case TRAIT_EXPR
: return TS_CP_TRAIT_EXPR
;
16411 case LAMBDA_EXPR
: return TS_CP_LAMBDA_EXPR
;
16412 case TEMPLATE_INFO
: return TS_CP_TEMPLATE_INFO
;
16413 case CONSTRAINT_INFO
: return TS_CP_CONSTRAINT_INFO
;
16414 case USERDEF_LITERAL
: return TS_CP_USERDEF_LITERAL
;
16415 default: return TS_CP_GENERIC
;
16419 /* Build the void_list_node (void_type_node having been created). */
16421 build_void_list_node (void)
16423 tree t
= build_tree_list (NULL_TREE
, void_type_node
);
16428 cp_missing_noreturn_ok_p (tree decl
)
16430 /* A missing noreturn is ok for the `main' function. */
16431 return DECL_MAIN_P (decl
);
16434 /* Return the decl used to identify the COMDAT group into which DECL should
16438 cxx_comdat_group (tree decl
)
16440 /* Virtual tables, construction virtual tables, and virtual table
16441 tables all go in a single COMDAT group, named after the primary
16443 if (VAR_P (decl
) && DECL_VTABLE_OR_VTT_P (decl
))
16444 decl
= CLASSTYPE_VTABLES (DECL_CONTEXT (decl
));
16445 /* For all other DECLs, the COMDAT group is the mangled name of the
16446 declaration itself. */
16449 while (DECL_THUNK_P (decl
))
16451 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
16452 into the same section as the target function. In that case
16453 we must return target's name. */
16454 tree target
= THUNK_TARGET (decl
);
16455 if (TARGET_USE_LOCAL_THUNK_ALIAS_P (target
)
16456 && DECL_SECTION_NAME (target
) != NULL
16457 && DECL_ONE_ONLY (target
))
16467 /* Returns the return type for FN as written by the user, which may include
16468 a placeholder for a deduced return type. */
16471 fndecl_declared_return_type (tree fn
)
16473 fn
= STRIP_TEMPLATE (fn
);
16474 if (FNDECL_USED_AUTO (fn
))
16476 struct language_function
*f
= NULL
;
16477 if (DECL_STRUCT_FUNCTION (fn
))
16478 f
= DECL_STRUCT_FUNCTION (fn
)->language
;
16480 f
= DECL_SAVED_FUNCTION_DATA (fn
);
16481 return f
->x_auto_return_pattern
;
16483 return TREE_TYPE (TREE_TYPE (fn
));
16486 /* Returns true iff DECL is a variable or function declared with an auto type
16487 that has not yet been deduced to a real type. */
16490 undeduced_auto_decl (tree decl
)
16492 if (cxx_dialect
< cxx11
)
16494 return ((VAR_OR_FUNCTION_DECL_P (decl
)
16495 || TREE_CODE (decl
) == TEMPLATE_DECL
)
16496 && type_uses_auto (TREE_TYPE (decl
)));
16499 /* Complain if DECL has an undeduced return type. */
16502 require_deduced_type (tree decl
, tsubst_flags_t complain
)
16504 if (undeduced_auto_decl (decl
))
16506 if (complain
& tf_error
)
16507 error ("use of %qD before deduction of %<auto%>", decl
);
16513 #include "gt-cp-decl.h"