1 /* Process declarations and variables for C++ compiler.
2 Copyright (C) 1988-2017 Free Software Foundation, Inc.
3 Contributed by Michael Tiemann (tiemann@cygnus.com)
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3, or (at your option)
12 GCC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING3. If not see
19 <http://www.gnu.org/licenses/>. */
22 /* Process declarations and symbol lookup for C++ front end.
23 Also constructs types; the standard scalar types at initialization,
24 and structure, union, array and enum types when they are declared. */
26 /* ??? not all decl nodes are given the most useful possible
27 line numbers. For example, the CONST_DECLs for enum values. */
31 #include "coretypes.h"
33 #include "c-family/c-target.h"
36 #include "stringpool.h"
38 #include "stor-layout.h"
42 #include "tree-iterator.h"
46 #include "c-family/c-objc.h"
47 #include "c-family/c-pragma.h"
48 #include "c-family/c-ubsan.h"
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 bool ambi_op_p (enum tree_code
);
69 static bool unary_op_p (enum tree_code
);
70 static void push_local_name (tree
);
71 static tree
grok_reference_init (tree
, tree
, tree
, int);
72 static tree
grokvardecl (tree
, tree
, tree
, const cp_decl_specifier_seq
*,
73 int, int, int, bool, int, tree
);
74 static int check_static_variable_definition (tree
, tree
);
75 static void record_unknown_type (tree
, const char *);
76 static tree
builtin_function_1 (tree
, tree
, bool);
77 static int member_function_or_else (tree
, tree
, enum overload_flags
);
78 static void check_for_uninitialized_const_var (tree
);
79 static tree
local_variable_p_walkfn (tree
*, int *, void *);
80 static const char *tag_name (enum tag_types
);
81 static tree
lookup_and_check_tag (enum tag_types
, tree
, tag_scope
, bool);
82 static void maybe_deduce_size_from_array_init (tree
, tree
);
83 static void layout_var_decl (tree
);
84 static tree
check_initializer (tree
, tree
, int, vec
<tree
, va_gc
> **);
85 static void make_rtl_for_nonlocal_decl (tree
, tree
, const char *);
86 static void save_function_data (tree
);
87 static void copy_type_enum (tree
, tree
);
88 static void check_function_type (tree
, tree
);
89 static void finish_constructor_body (void);
90 static void begin_destructor_body (void);
91 static void finish_destructor_body (void);
92 static void record_key_method_defined (tree
);
93 static tree
create_array_type_for_decl (tree
, tree
, tree
);
94 static tree
get_atexit_node (void);
95 static tree
get_dso_handle_node (void);
96 static tree
start_cleanup_fn (void);
97 static void end_cleanup_fn (void);
98 static tree
cp_make_fname_decl (location_t
, tree
, int);
99 static void initialize_predefined_identifiers (void);
100 static tree check_special_function_return_type
101 (special_function_kind
, tree
, tree
, int, const location_t
*);
102 static tree
push_cp_library_fn (enum tree_code
, tree
, int);
103 static tree
build_cp_library_fn (tree
, enum tree_code
, tree
, int);
104 static void store_parm_decls (tree
);
105 static void initialize_local_var (tree
, tree
);
106 static void expand_static_init (tree
, tree
);
108 /* The following symbols are subsumed in the cp_global_trees array, and
109 listed here individually for documentation purposes.
112 tree wchar_decl_node;
114 tree vtable_entry_type;
115 tree delta_type_node;
116 tree __t_desc_type_node;
118 tree class_type_node;
119 tree unknown_type_node;
121 Array type `vtable_entry_type[]'
124 tree vtbl_ptr_type_node;
131 A FUNCTION_DECL which can call `abort'. Not necessarily the
132 one that the user will declare, but sufficient to be called
133 by routines that want to abort the program.
138 tree type_info_type_node, tinfo_decl_id, tinfo_decl_type;
139 tree tinfo_var_id; */
141 tree cp_global_trees
[CPTI_MAX
];
143 #define local_names cp_function_chain->x_local_names
145 /* A list of objects which have constructors or destructors
146 which reside in the global scope. The decl is stored in
147 the TREE_VALUE slot and the initializer is stored
148 in the TREE_PURPOSE slot. */
149 tree static_aggregates
;
151 /* Like static_aggregates, but for thread_local variables. */
156 /* A node for the integer constant 2. */
158 tree integer_two_node
;
160 /* vector of static decls. */
161 vec
<tree
, va_gc
> *static_decls
;
163 /* vector of keyed classes. */
164 vec
<tree
, va_gc
> *keyed_classes
;
166 /* Used only for jumps to as-yet undefined labels, since jumps to
167 defined labels can have their validity checked immediately. */
169 struct GTY((chain_next ("%h.next"))) named_label_use_entry
{
170 struct named_label_use_entry
*next
;
171 /* The binding level to which this entry is *currently* attached.
172 This is initially the binding level in which the goto appeared,
173 but is modified as scopes are closed. */
174 cp_binding_level
*binding_level
;
175 /* The head of the names list that was current when the goto appeared,
176 or the inner scope popped. These are the decls that will *not* be
177 skipped when jumping to the label. */
179 /* The location of the goto, for error reporting. */
180 location_t o_goto_locus
;
181 /* True if an OpenMP structured block scope has been closed since
182 the goto appeared. This means that the branch from the label will
183 illegally exit an OpenMP scope. */
187 /* A list of all LABEL_DECLs in the function that have names. Here so
188 we can clear out their names' definitions at the end of the
189 function, and so we can check the validity of jumps to these labels. */
191 struct GTY((for_user
)) named_label_entry
{
193 tree name
; /* Name of decl. */
195 tree label_decl
; /* LABEL_DECL, unless deleted local label. */
197 named_label_entry
*outer
; /* Outer shadowed chain. */
199 /* The binding level to which the label is *currently* attached.
200 This is initially set to the binding level in which the label
201 is defined, but is modified as scopes are closed. */
202 cp_binding_level
*binding_level
;
204 /* The head of the names list that was current when the label was
205 defined, or the inner scope popped. These are the decls that will
206 be skipped when jumping to the label. */
209 /* A vector of all decls from all binding levels that would be
210 crossed by a backward branch to the label. */
211 vec
<tree
, va_gc
> *bad_decls
;
213 /* A list of uses of the label, before the label is defined. */
214 named_label_use_entry
*uses
;
216 /* The following bits are set after the label is defined, and are
217 updated as scopes are popped. They indicate that a jump to the
218 label will illegally enter a scope of the given flavor. */
222 bool in_transaction_scope
;
223 bool in_constexpr_if
;
226 #define named_labels cp_function_chain->x_named_labels
228 /* The number of function bodies which we are currently processing.
229 (Zero if we are at namespace scope, one inside the body of a
230 function, two inside the body of a function in a local class, etc.) */
233 /* Whether the exception-specifier is part of a function type (i.e. C++17). */
234 bool flag_noexcept_type
;
236 /* States indicating how grokdeclarator() should handle declspecs marked
237 with __attribute__((deprecated)). An object declared as
238 __attribute__((deprecated)) suppresses warnings of uses of other
240 enum deprecated_states deprecated_state
= DEPRECATED_NORMAL
;
243 /* A list of VAR_DECLs whose type was incomplete at the time the
244 variable was declared. */
246 struct GTY(()) incomplete_var
{
248 tree incomplete_type
;
252 static GTY(()) vec
<incomplete_var
, va_gc
> *incomplete_vars
;
254 /* Returns the kind of template specialization we are currently
255 processing, given that it's declaration contained N_CLASS_SCOPES
256 explicit scope qualifications. */
259 current_tmpl_spec_kind (int n_class_scopes
)
261 int n_template_parm_scopes
= 0;
262 int seen_specialization_p
= 0;
263 int innermost_specialization_p
= 0;
266 /* Scan through the template parameter scopes. */
267 for (b
= current_binding_level
;
268 b
->kind
== sk_template_parms
;
271 /* If we see a specialization scope inside a parameter scope,
272 then something is wrong. That corresponds to a declaration
275 template <class T> template <> ...
277 which is always invalid since [temp.expl.spec] forbids the
278 specialization of a class member template if the enclosing
279 class templates are not explicitly specialized as well. */
280 if (b
->explicit_spec_p
)
282 if (n_template_parm_scopes
== 0)
283 innermost_specialization_p
= 1;
285 seen_specialization_p
= 1;
287 else if (seen_specialization_p
== 1)
288 return tsk_invalid_member_spec
;
290 ++n_template_parm_scopes
;
293 /* Handle explicit instantiations. */
294 if (processing_explicit_instantiation
)
296 if (n_template_parm_scopes
!= 0)
297 /* We've seen a template parameter list during an explicit
298 instantiation. For example:
300 template <class T> template void f(int);
302 This is erroneous. */
303 return tsk_invalid_expl_inst
;
305 return tsk_expl_inst
;
308 if (n_template_parm_scopes
< n_class_scopes
)
309 /* We've not seen enough template headers to match all the
310 specialized classes present. For example:
312 template <class T> void R<T>::S<T>::f(int);
314 This is invalid; there needs to be one set of template
315 parameters for each class. */
316 return tsk_insufficient_parms
;
317 else if (n_template_parm_scopes
== n_class_scopes
)
318 /* We're processing a non-template declaration (even though it may
319 be a member of a template class.) For example:
321 template <class T> void S<T>::f(int);
323 The `class T' matches the `S<T>', leaving no template headers
324 corresponding to the `f'. */
326 else if (n_template_parm_scopes
> n_class_scopes
+ 1)
327 /* We've got too many template headers. For example:
329 template <> template <class T> void f (T);
331 There need to be more enclosing classes. */
332 return tsk_excessive_parms
;
334 /* This must be a template. It's of the form:
336 template <class T> template <class U> void S<T>::f(U);
338 This is a specialization if the innermost level was a
339 specialization; otherwise it's just a definition of the
341 return innermost_specialization_p
? tsk_expl_spec
: tsk_template
;
344 /* Exit the current scope. */
352 /* When a label goes out of scope, check to see if that label was used
353 in a valid manner, and issue any appropriate warnings or errors. */
356 check_label_used (tree label
)
358 if (!processing_template_decl
)
360 if (DECL_INITIAL (label
) == NULL_TREE
)
364 error ("label %q+D used but not defined", label
);
365 location
= input_location
;
366 /* FIXME want (LOCATION_FILE (input_location), (line)0) */
367 /* Avoid crashing later. */
368 define_label (location
, DECL_NAME (label
));
371 warn_for_unused_label (label
);
375 /* Helper function to sort named label entries in a vector by DECL_UID. */
378 sort_labels (const void *a
, const void *b
)
380 tree label1
= *(tree
const *) a
;
381 tree label2
= *(tree
const *) b
;
383 /* DECL_UIDs can never be equal. */
384 return DECL_UID (label1
) > DECL_UID (label2
) ? -1 : +1;
387 /* At the end of a function, all labels declared within the function
388 go out of scope. BLOCK is the top-level block for the
392 pop_labels (tree block
)
397 /* We need to add the labels to the block chain, so debug
398 information is emitted. But, we want the order to be stable so
399 need to sort them first. Otherwise the debug output could be
400 randomly ordered. I guess it's mostly stable, unless the hash
401 table implementation changes. */
402 auto_vec
<tree
, 32> labels (named_labels
->elements ());
403 hash_table
<named_label_hash
>::iterator
end (named_labels
->end ());
404 for (hash_table
<named_label_hash
>::iterator iter
405 (named_labels
->begin ()); iter
!= end
; ++iter
)
407 named_label_entry
*ent
= *iter
;
409 gcc_checking_assert (!ent
->outer
);
411 labels
.quick_push (ent
->label_decl
);
415 labels
.qsort (sort_labels
);
417 while (labels
.length ())
419 tree label
= labels
.pop ();
421 DECL_CHAIN (label
) = BLOCK_VARS (block
);
422 BLOCK_VARS (block
) = label
;
424 check_label_used (label
);
428 /* At the end of a block with local labels, restore the outer definition. */
431 pop_local_label (tree id
, tree label
)
433 check_label_used (label
);
434 named_label_entry
**slot
= named_labels
->find_slot_with_hash
435 (id
, IDENTIFIER_HASH_VALUE (id
), NO_INSERT
);
436 named_label_entry
*ent
= *slot
;
442 ent
= ggc_cleared_alloc
<named_label_entry
> ();
448 /* The following two routines are used to interface to Objective-C++.
449 The binding level is purposely treated as an opaque type. */
452 objc_get_current_scope (void)
454 return current_binding_level
;
457 /* The following routine is used by the NeXT-style SJLJ exceptions;
458 variables get marked 'volatile' so as to not be clobbered by
459 _setjmp()/_longjmp() calls. All variables in the current scope,
460 as well as parent scopes up to (but not including) ENCLOSING_BLK
461 shall be thusly marked. */
464 objc_mark_locals_volatile (void *enclosing_blk
)
466 cp_binding_level
*scope
;
468 for (scope
= current_binding_level
;
469 scope
&& scope
!= enclosing_blk
;
470 scope
= scope
->level_chain
)
474 for (decl
= scope
->names
; decl
; decl
= TREE_CHAIN (decl
))
475 objc_volatilize_decl (decl
);
477 /* Do not climb up past the current function. */
478 if (scope
->kind
== sk_function_parms
)
483 /* True if B is the level for the condition of a constexpr if. */
486 level_for_constexpr_if (cp_binding_level
*b
)
488 return (b
->kind
== sk_cond
&& b
->this_entity
489 && TREE_CODE (b
->this_entity
) == IF_STMT
490 && IF_STMT_CONSTEXPR_P (b
->this_entity
));
493 /* Update data for defined and undefined labels when leaving a scope. */
496 poplevel_named_label_1 (named_label_entry
**slot
, cp_binding_level
*bl
)
498 named_label_entry
*ent
= *slot
;
499 cp_binding_level
*obl
= bl
->level_chain
;
501 if (ent
->binding_level
== bl
)
505 /* ENT->NAMES_IN_SCOPE may contain a mixture of DECLs and
506 TREE_LISTs representing OVERLOADs, so be careful. */
507 for (decl
= ent
->names_in_scope
; decl
; decl
= (DECL_P (decl
)
509 : TREE_CHAIN (decl
)))
510 if (decl_jump_unsafe (decl
))
511 vec_safe_push (ent
->bad_decls
, decl
);
513 ent
->binding_level
= obl
;
514 ent
->names_in_scope
= obl
->names
;
518 ent
->in_try_scope
= true;
521 ent
->in_catch_scope
= true;
524 ent
->in_omp_scope
= true;
527 ent
->in_transaction_scope
= true;
530 if (level_for_constexpr_if (bl
->level_chain
))
531 ent
->in_constexpr_if
= true;
539 struct named_label_use_entry
*use
;
541 for (use
= ent
->uses
; use
; use
= use
->next
)
542 if (use
->binding_level
== bl
)
544 use
->binding_level
= obl
;
545 use
->names_in_scope
= obl
->names
;
546 if (bl
->kind
== sk_omp
)
547 use
->in_omp_scope
= true;
554 /* Saved errorcount to avoid -Wunused-but-set-{parameter,variable} warnings
555 when errors were reported, except for -Werror-unused-but-set-*. */
556 static int unused_but_set_errorcount
;
558 /* Exit a binding level.
559 Pop the level off, and restore the state of the identifier-decl mappings
560 that were in effect when this level was entered.
562 If KEEP == 1, this level had explicit declarations, so
563 and create a "block" (a BLOCK node) for the level
564 to record its declarations and subblocks for symbol table output.
566 If FUNCTIONBODY is nonzero, this level is the body of a function,
567 so create a block as if KEEP were set and also clear out all
570 If REVERSE is nonzero, reverse the order of decls before putting
571 them into the BLOCK. */
574 poplevel (int keep
, int reverse
, int functionbody
)
577 /* The chain of decls was accumulated in reverse order.
578 Put it into forward order, just for cleanliness. */
583 int leaving_for_scope
;
587 bool subtime
= timevar_cond_start (TV_NAME_LOOKUP
);
592 gcc_assert (current_binding_level
->kind
!= sk_class
593 && current_binding_level
->kind
!= sk_namespace
);
595 if (current_binding_level
->kind
== sk_cleanup
)
597 subblocks
= functionbody
>= 0 ? current_binding_level
->blocks
: 0;
599 gcc_assert (!vec_safe_length (current_binding_level
->class_shadowed
));
601 /* We used to use KEEP == 2 to indicate that the new block should go
602 at the beginning of the list of blocks at this binding level,
603 rather than the end. This hack is no longer used. */
604 gcc_assert (keep
== 0 || keep
== 1);
606 if (current_binding_level
->keep
)
609 /* Any uses of undefined labels, and any defined labels, now operate
610 under constraints of next binding contour. */
611 if (cfun
&& !functionbody
&& named_labels
)
612 named_labels
->traverse
<cp_binding_level
*, poplevel_named_label_1
>
613 (current_binding_level
);
615 /* Get the decls in the order they were written.
616 Usually current_binding_level->names is in reverse order.
617 But parameter decls were previously put in forward order. */
619 decls
= current_binding_level
->names
;
622 decls
= nreverse (decls
);
623 current_binding_level
->names
= decls
;
626 /* If there were any declarations or structure tags in that level,
627 or if this level is a function body,
628 create a BLOCK to record them for the life of this function. */
630 /* Avoid function body block if possible. */
631 if (functionbody
&& subblocks
&& BLOCK_CHAIN (subblocks
) == NULL_TREE
)
633 else if (keep
== 1 || functionbody
)
634 block
= make_node (BLOCK
);
635 if (block
!= NULL_TREE
)
637 BLOCK_VARS (block
) = decls
;
638 BLOCK_SUBBLOCKS (block
) = subblocks
;
641 /* In each subblock, record that this is its superior. */
643 for (link
= subblocks
; link
; link
= BLOCK_CHAIN (link
))
644 BLOCK_SUPERCONTEXT (link
) = block
;
646 /* We still support the old for-scope rules, whereby the variables
647 in a init statement were in scope after the for-statement ended.
648 We only use the new rules if flag_new_for_scope is nonzero. */
650 = current_binding_level
->kind
== sk_for
&& flag_new_for_scope
== 1;
652 /* Before we remove the declarations first check for unused variables. */
653 if ((warn_unused_variable
|| warn_unused_but_set_variable
)
654 && current_binding_level
->kind
!= sk_template_parms
655 && !processing_template_decl
)
656 for (tree d
= get_local_decls (); d
; d
= TREE_CHAIN (d
))
658 /* There are cases where D itself is a TREE_LIST. See in
659 push_local_binding where the list of decls returned by
660 getdecls is built. */
661 decl
= TREE_CODE (d
) == TREE_LIST
? TREE_VALUE (d
) : d
;
663 tree type
= TREE_TYPE (decl
);
665 && (! TREE_USED (decl
) || !DECL_READ_P (decl
))
666 && ! DECL_IN_SYSTEM_HEADER (decl
)
667 /* For structured bindings, consider only real variables, not
669 && (DECL_DECOMPOSITION_P (decl
) ? !DECL_DECOMP_BASE (decl
)
670 : (DECL_NAME (decl
) && !DECL_ARTIFICIAL (decl
)))
671 && type
!= error_mark_node
672 && (!CLASS_TYPE_P (type
)
673 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type
)
674 || lookup_attribute ("warn_unused",
675 TYPE_ATTRIBUTES (TREE_TYPE (decl
)))))
677 if (! TREE_USED (decl
))
679 if (!DECL_NAME (decl
) && DECL_DECOMPOSITION_P (decl
))
680 warning_at (DECL_SOURCE_LOCATION (decl
),
681 OPT_Wunused_variable
,
682 "unused structured binding declaration");
684 warning_at (DECL_SOURCE_LOCATION (decl
),
685 OPT_Wunused_variable
, "unused variable %qD", decl
);
687 else if (DECL_CONTEXT (decl
) == current_function_decl
688 // For -Wunused-but-set-variable leave references alone.
689 && TREE_CODE (TREE_TYPE (decl
)) != REFERENCE_TYPE
690 && errorcount
== unused_but_set_errorcount
)
692 if (!DECL_NAME (decl
) && DECL_DECOMPOSITION_P (decl
))
693 warning_at (DECL_SOURCE_LOCATION (decl
),
694 OPT_Wunused_but_set_variable
, "structured "
695 "binding declaration set but not used");
697 warning_at (DECL_SOURCE_LOCATION (decl
),
698 OPT_Wunused_but_set_variable
,
699 "variable %qD set but not used", decl
);
700 unused_but_set_errorcount
= errorcount
;
705 /* Remove declarations for all the DECLs in this level. */
706 for (link
= decls
; link
; link
= TREE_CHAIN (link
))
708 decl
= TREE_CODE (link
) == TREE_LIST
? TREE_VALUE (link
) : link
;
709 tree name
= OVL_NAME (decl
);
711 if (leaving_for_scope
&& VAR_P (decl
)
712 /* It's hard to make this ARM compatibility hack play nicely with
713 lambdas, and it really isn't necessary in C++11 mode. */
714 && cxx_dialect
< cxx11
717 cxx_binding
*ob
= outer_binding (name
,
718 IDENTIFIER_BINDING (name
),
720 tree ns_binding
= NULL_TREE
;
722 ns_binding
= get_namespace_binding (current_namespace
, name
);
724 if (ob
&& ob
->scope
== current_binding_level
->level_chain
)
725 /* We have something like:
730 and we are leaving the `for' scope. There's no reason to
731 keep the binding of the inner `i' in this case. */
733 else if ((ob
&& (TREE_CODE (ob
->value
) == TYPE_DECL
))
734 || (ns_binding
&& TREE_CODE (ns_binding
) == TYPE_DECL
))
735 /* Here, we have something like:
743 We must pop the for-scope binding so we know what's a
744 type and what isn't. */
748 /* Mark this VAR_DECL as dead so that we can tell we left it
749 there only for backward compatibility. */
750 DECL_DEAD_FOR_LOCAL (link
) = 1;
752 /* Keep track of what should have happened when we
753 popped the binding. */
756 SET_DECL_SHADOWED_FOR_VAR (link
, ob
->value
);
757 DECL_HAS_SHADOWED_FOR_VAR_P (link
) = 1;
760 /* Add it to the list of dead variables in the next
761 outermost binding to that we can remove these when we
762 leave that binding. */
764 current_binding_level
->level_chain
->dead_vars_from_for
,
767 /* Although we don't pop the cxx_binding, we do clear
768 its SCOPE since the scope is going away now. */
769 IDENTIFIER_BINDING (name
)->scope
770 = current_binding_level
->level_chain
;
772 /* Don't remove the binding. */
776 /* Remove the binding. */
777 if (TREE_CODE (decl
) == LABEL_DECL
)
778 pop_local_label (name
, decl
);
780 pop_local_binding (name
, decl
);
783 /* Remove declarations for any `for' variables from inner scopes
784 that we kept around. */
785 FOR_EACH_VEC_SAFE_ELT_REVERSE (current_binding_level
->dead_vars_from_for
,
787 pop_local_binding (DECL_NAME (decl
), decl
);
789 /* Restore the IDENTIFIER_TYPE_VALUEs. */
790 for (link
= current_binding_level
->type_shadowed
;
791 link
; link
= TREE_CHAIN (link
))
792 SET_IDENTIFIER_TYPE_VALUE (TREE_PURPOSE (link
), TREE_VALUE (link
));
794 /* There may be OVERLOADs (wrapped in TREE_LISTs) on the BLOCK_VARs
795 list if a `using' declaration put them there. The debugging
796 back ends won't understand OVERLOAD, so we remove them here.
797 Because the BLOCK_VARS are (temporarily) shared with
798 CURRENT_BINDING_LEVEL->NAMES we must do this fixup after we have
799 popped all the bindings. Also remove undeduced 'auto' decls,
800 which LTO doesn't understand, and can't have been used by anything. */
805 for (d
= &BLOCK_VARS (block
); *d
; )
807 if (TREE_CODE (*d
) == TREE_LIST
808 || (!processing_template_decl
809 && undeduced_auto_decl (*d
)))
810 *d
= TREE_CHAIN (*d
);
812 d
= &DECL_CHAIN (*d
);
816 /* If the level being exited is the top level of a function,
817 check over all the labels. */
822 /* Since this is the top level block of a function, the vars are
823 the function's parameters. Don't leave them in the BLOCK
824 because they are found in the FUNCTION_DECL instead. */
825 BLOCK_VARS (block
) = 0;
829 pop_labels (subblocks
);
832 kind
= current_binding_level
->kind
;
833 if (kind
== sk_cleanup
)
837 /* If this is a temporary binding created for a cleanup, then we'll
838 have pushed a statement list level. Pop that, create a new
839 BIND_EXPR for the block, and insert it into the stream. */
840 stmt
= pop_stmt_list (current_binding_level
->statement_list
);
841 stmt
= c_build_bind_expr (input_location
, block
, stmt
);
848 /* The current function is being defined, so its DECL_INITIAL
849 should be error_mark_node. */
850 gcc_assert (DECL_INITIAL (current_function_decl
) == error_mark_node
);
851 DECL_INITIAL (current_function_decl
) = block
? block
: subblocks
;
854 if (FUNCTION_NEEDS_BODY_BLOCK (current_function_decl
))
856 if (BLOCK_SUBBLOCKS (subblocks
))
857 BLOCK_OUTER_CURLY_BRACE_P (BLOCK_SUBBLOCKS (subblocks
)) = 1;
860 BLOCK_OUTER_CURLY_BRACE_P (subblocks
) = 1;
864 current_binding_level
->blocks
865 = block_chainon (current_binding_level
->blocks
, block
);
867 /* If we did not make a block for the level just exited,
868 any blocks made for inner levels
869 (since they cannot be recorded as subblocks in that level)
870 must be carried forward so they will later become subblocks
871 of something else. */
873 current_binding_level
->blocks
874 = block_chainon (current_binding_level
->blocks
, subblocks
);
876 /* Each and every BLOCK node created here in `poplevel' is important
877 (e.g. for proper debugging information) so if we created one
878 earlier, mark it as "used". */
880 TREE_USED (block
) = 1;
882 /* All temporary bindings created for cleanups are popped silently. */
883 if (kind
== sk_cleanup
)
886 timevar_cond_stop (TV_NAME_LOOKUP
, subtime
);
890 /* Call wrapup_globals_declarations for the globals in NAMESPACE. */
891 /* Diagnose odr-used extern inline variables without definitions
892 in the current TU. */
895 wrapup_namespace_globals ()
897 if (vec
<tree
, va_gc
> *statics
= static_decls
)
901 FOR_EACH_VEC_ELT (*statics
, i
, decl
)
903 if (warn_unused_function
904 && TREE_CODE (decl
) == FUNCTION_DECL
905 && DECL_INITIAL (decl
) == 0
906 && DECL_EXTERNAL (decl
)
907 && !TREE_PUBLIC (decl
)
908 && !DECL_ARTIFICIAL (decl
)
909 && !DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl
)
910 && !TREE_NO_WARNING (decl
))
911 warning_at (DECL_SOURCE_LOCATION (decl
),
912 OPT_Wunused_function
,
913 "%qF declared %<static%> but never defined", decl
);
916 && DECL_EXTERNAL (decl
)
917 && DECL_INLINE_VAR_P (decl
)
918 && DECL_ODR_USED (decl
))
919 error_at (DECL_SOURCE_LOCATION (decl
),
920 "odr-used inline variable %qD is not defined", decl
);
923 /* Clear out the list, so we don't rescan next time. */
926 /* Write out any globals that need to be output. */
927 return wrapup_global_declarations (statics
->address (),
933 /* In C++, you don't have to write `struct S' to refer to `S'; you
934 can just use `S'. We accomplish this by creating a TYPE_DECL as
935 if the user had written `typedef struct S S'. Create and return
936 the TYPE_DECL for TYPE. */
939 create_implicit_typedef (tree name
, tree type
)
943 decl
= build_decl (input_location
, TYPE_DECL
, name
, type
);
944 DECL_ARTIFICIAL (decl
) = 1;
945 /* There are other implicit type declarations, like the one *within*
946 a class that allows you to write `S::S'. We must distinguish
948 SET_DECL_IMPLICIT_TYPEDEF_P (decl
);
949 TYPE_NAME (type
) = decl
;
950 TYPE_STUB_DECL (type
) = decl
;
955 /* Remember a local name for name-mangling purposes. */
958 push_local_name (tree decl
)
963 timevar_start (TV_NAME_LOOKUP
);
965 name
= DECL_NAME (decl
);
967 nelts
= vec_safe_length (local_names
);
968 for (i
= 0; i
< nelts
; i
++)
970 t
= (*local_names
)[i
];
971 if (DECL_NAME (t
) == name
)
973 retrofit_lang_decl (decl
);
974 DECL_LANG_SPECIFIC (decl
)->u
.base
.u2sel
= 1;
975 if (DECL_DISCRIMINATOR_SET_P (t
))
976 DECL_DISCRIMINATOR (decl
) = DECL_DISCRIMINATOR (t
) + 1;
978 DECL_DISCRIMINATOR (decl
) = 1;
980 (*local_names
)[i
] = decl
;
981 timevar_stop (TV_NAME_LOOKUP
);
986 vec_safe_push (local_names
, decl
);
987 timevar_stop (TV_NAME_LOOKUP
);
990 /* Subroutine of duplicate_decls: return truthvalue of whether
991 or not types of these decls match.
993 For C++, we must compare the parameter list so that `int' can match
994 `int&' in a parameter position, but `int&' is not confused with
998 decls_match (tree newdecl
, tree olddecl
)
1002 if (newdecl
== olddecl
)
1005 if (TREE_CODE (newdecl
) != TREE_CODE (olddecl
))
1006 /* If the two DECLs are not even the same kind of thing, we're not
1007 interested in their types. */
1010 gcc_assert (DECL_P (newdecl
));
1012 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1014 tree f1
= TREE_TYPE (newdecl
);
1015 tree f2
= TREE_TYPE (olddecl
);
1016 tree p1
= TYPE_ARG_TYPES (f1
);
1017 tree p2
= TYPE_ARG_TYPES (f2
);
1020 /* Specializations of different templates are different functions
1021 even if they have the same type. */
1022 tree t1
= (DECL_USE_TEMPLATE (newdecl
)
1023 ? DECL_TI_TEMPLATE (newdecl
)
1025 tree t2
= (DECL_USE_TEMPLATE (olddecl
)
1026 ? DECL_TI_TEMPLATE (olddecl
)
1031 if (CP_DECL_CONTEXT (newdecl
) != CP_DECL_CONTEXT (olddecl
)
1032 && ! (DECL_EXTERN_C_P (newdecl
)
1033 && DECL_EXTERN_C_P (olddecl
)))
1036 /* A new declaration doesn't match a built-in one unless it
1037 is also extern "C". */
1038 if (DECL_IS_BUILTIN (olddecl
)
1039 && DECL_EXTERN_C_P (olddecl
) && !DECL_EXTERN_C_P (newdecl
))
1042 if (TREE_CODE (f1
) != TREE_CODE (f2
))
1045 /* A declaration with deduced return type should use its pre-deduction
1046 type for declaration matching. */
1047 r2
= fndecl_declared_return_type (olddecl
);
1049 if (same_type_p (TREE_TYPE (f1
), r2
))
1051 if (!prototype_p (f2
) && DECL_EXTERN_C_P (olddecl
)
1052 && (DECL_BUILT_IN (olddecl
)
1053 #ifndef NO_IMPLICIT_EXTERN_C
1054 || (DECL_IN_SYSTEM_HEADER (newdecl
) && !DECL_CLASS_SCOPE_P (newdecl
))
1055 || (DECL_IN_SYSTEM_HEADER (olddecl
) && !DECL_CLASS_SCOPE_P (olddecl
))
1059 types_match
= self_promoting_args_p (p1
);
1060 if (p1
== void_list_node
)
1061 TREE_TYPE (newdecl
) = TREE_TYPE (olddecl
);
1063 #ifndef NO_IMPLICIT_EXTERN_C
1064 else if (!prototype_p (f1
)
1065 && (DECL_EXTERN_C_P (olddecl
)
1066 && DECL_IN_SYSTEM_HEADER (olddecl
)
1067 && !DECL_CLASS_SCOPE_P (olddecl
))
1068 && (DECL_EXTERN_C_P (newdecl
)
1069 && DECL_IN_SYSTEM_HEADER (newdecl
)
1070 && !DECL_CLASS_SCOPE_P (newdecl
)))
1072 types_match
= self_promoting_args_p (p2
);
1073 TREE_TYPE (newdecl
) = TREE_TYPE (olddecl
);
1079 && type_memfn_rqual (f1
) == type_memfn_rqual (f2
)
1080 && (TYPE_ATTRIBUTES (TREE_TYPE (newdecl
)) == NULL_TREE
1081 || comp_type_attributes (TREE_TYPE (newdecl
),
1082 TREE_TYPE (olddecl
)) != 0);
1087 /* The decls dont match if they correspond to two different versions
1088 of the same function. Disallow extern "C" functions to be
1089 versions for now. */
1091 && !DECL_EXTERN_C_P (newdecl
)
1092 && !DECL_EXTERN_C_P (olddecl
)
1093 && maybe_version_functions (newdecl
, olddecl
))
1096 else if (TREE_CODE (newdecl
) == TEMPLATE_DECL
)
1098 tree oldres
= DECL_TEMPLATE_RESULT (olddecl
);
1099 tree newres
= DECL_TEMPLATE_RESULT (newdecl
);
1101 if (TREE_CODE (newres
) != TREE_CODE (oldres
))
1104 if (!comp_template_parms (DECL_TEMPLATE_PARMS (newdecl
),
1105 DECL_TEMPLATE_PARMS (olddecl
)))
1108 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl
)) == TYPE_DECL
)
1109 types_match
= (same_type_p (TREE_TYPE (oldres
), TREE_TYPE (newres
))
1110 && equivalently_constrained (olddecl
, newdecl
));
1112 // We don't need to check equivalently_constrained for variable and
1113 // function templates because we check it on the results.
1114 types_match
= decls_match (oldres
, newres
);
1118 /* Need to check scope for variable declaration (VAR_DECL).
1119 For typedef (TYPE_DECL), scope is ignored. */
1121 && CP_DECL_CONTEXT (newdecl
) != CP_DECL_CONTEXT (olddecl
)
1123 Two declarations for an object with C language linkage
1124 with the same name (ignoring the namespace that qualify
1125 it) that appear in different namespace scopes refer to
1127 && !(DECL_EXTERN_C_P (olddecl
) && DECL_EXTERN_C_P (newdecl
)))
1130 if (TREE_TYPE (newdecl
) == error_mark_node
)
1131 types_match
= TREE_TYPE (olddecl
) == error_mark_node
;
1132 else if (TREE_TYPE (olddecl
) == NULL_TREE
)
1133 types_match
= TREE_TYPE (newdecl
) == NULL_TREE
;
1134 else if (TREE_TYPE (newdecl
) == NULL_TREE
)
1137 types_match
= comptypes (TREE_TYPE (newdecl
),
1138 TREE_TYPE (olddecl
),
1139 COMPARE_REDECLARATION
);
1142 // Normal functions can be constrained, as can variable partial
1144 if (types_match
&& VAR_OR_FUNCTION_DECL_P (newdecl
))
1145 types_match
= equivalently_constrained (newdecl
, olddecl
);
1150 /* NEWDECL and OLDDECL have identical signatures. If they are
1151 different versions adjust them and return true. */
1154 maybe_version_functions (tree newdecl
, tree olddecl
)
1156 if (!targetm
.target_option
.function_versions (newdecl
, olddecl
))
1159 bool record
= false;
1161 if (!DECL_FUNCTION_VERSIONED (olddecl
))
1164 DECL_FUNCTION_VERSIONED (olddecl
) = 1;
1165 if (DECL_ASSEMBLER_NAME_SET_P (olddecl
))
1166 mangle_decl (olddecl
);
1169 if (!DECL_FUNCTION_VERSIONED (newdecl
))
1172 DECL_FUNCTION_VERSIONED (newdecl
) = 1;
1173 if (DECL_ASSEMBLER_NAME_SET_P (newdecl
))
1174 mangle_decl (newdecl
);
1177 /* Only record if at least one was not already versions. */
1179 cgraph_node::record_function_versions (olddecl
, newdecl
);
1184 /* If NEWDECL is `static' and an `extern' was seen previously,
1185 warn about it. OLDDECL is the previous declaration.
1187 Note that this does not apply to the C++ case of declaring
1188 a variable `extern const' and then later `const'.
1190 Don't complain about built-in functions, since they are beyond
1191 the user's control. */
1194 warn_extern_redeclared_static (tree newdecl
, tree olddecl
)
1196 if (TREE_CODE (newdecl
) == TYPE_DECL
1197 || TREE_CODE (newdecl
) == TEMPLATE_DECL
1198 || TREE_CODE (newdecl
) == CONST_DECL
1199 || TREE_CODE (newdecl
) == NAMESPACE_DECL
)
1202 /* Don't get confused by static member functions; that's a different
1204 if (TREE_CODE (newdecl
) == FUNCTION_DECL
1205 && DECL_STATIC_FUNCTION_P (newdecl
))
1208 /* If the old declaration was `static', or the new one isn't, then
1209 everything is OK. */
1210 if (DECL_THIS_STATIC (olddecl
) || !DECL_THIS_STATIC (newdecl
))
1213 /* It's OK to declare a builtin function as `static'. */
1214 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1215 && DECL_ARTIFICIAL (olddecl
))
1218 if (permerror (DECL_SOURCE_LOCATION (newdecl
),
1219 "%qD was declared %<extern%> and later %<static%>", newdecl
))
1220 inform (DECL_SOURCE_LOCATION (olddecl
),
1221 "previous declaration of %qD", olddecl
);
1224 /* NEW_DECL is a redeclaration of OLD_DECL; both are functions or
1225 function templates. If their exception specifications do not
1226 match, issue a diagnostic. */
1229 check_redeclaration_exception_specification (tree new_decl
,
1232 tree new_exceptions
= TYPE_RAISES_EXCEPTIONS (TREE_TYPE (new_decl
));
1233 tree old_exceptions
= TYPE_RAISES_EXCEPTIONS (TREE_TYPE (old_decl
));
1235 /* Two default specs are equivalent, don't force evaluation. */
1236 if (UNEVALUATED_NOEXCEPT_SPEC_P (new_exceptions
)
1237 && UNEVALUATED_NOEXCEPT_SPEC_P (old_exceptions
))
1240 maybe_instantiate_noexcept (new_decl
);
1241 maybe_instantiate_noexcept (old_decl
);
1242 new_exceptions
= TYPE_RAISES_EXCEPTIONS (TREE_TYPE (new_decl
));
1243 old_exceptions
= TYPE_RAISES_EXCEPTIONS (TREE_TYPE (old_decl
));
1247 If any declaration of a function has an exception-specification,
1248 all declarations, including the definition and an explicit
1249 specialization, of that function shall have an
1250 exception-specification with the same set of type-ids. */
1251 if (! DECL_IS_BUILTIN (old_decl
)
1252 && !comp_except_specs (new_exceptions
, old_exceptions
, ce_normal
))
1254 const char *const msg
1255 = G_("declaration of %qF has a different exception specifier");
1256 bool complained
= true;
1257 location_t new_loc
= DECL_SOURCE_LOCATION (new_decl
);
1258 if (DECL_IN_SYSTEM_HEADER (old_decl
))
1259 complained
= pedwarn (new_loc
, OPT_Wsystem_headers
, msg
, new_decl
);
1260 else if (!flag_exceptions
)
1261 /* We used to silently permit mismatched eh specs with
1262 -fno-exceptions, so make them a pedwarn now. */
1263 complained
= pedwarn (new_loc
, OPT_Wpedantic
, msg
, new_decl
);
1265 error_at (new_loc
, msg
, new_decl
);
1267 inform (DECL_SOURCE_LOCATION (old_decl
),
1268 "from previous declaration %qF", old_decl
);
1272 /* Return true if OLD_DECL and NEW_DECL agree on constexprness.
1273 Otherwise issue diagnostics. */
1276 validate_constexpr_redeclaration (tree old_decl
, tree new_decl
)
1278 old_decl
= STRIP_TEMPLATE (old_decl
);
1279 new_decl
= STRIP_TEMPLATE (new_decl
);
1280 if (!VAR_OR_FUNCTION_DECL_P (old_decl
)
1281 || !VAR_OR_FUNCTION_DECL_P (new_decl
))
1283 if (DECL_DECLARED_CONSTEXPR_P (old_decl
)
1284 == DECL_DECLARED_CONSTEXPR_P (new_decl
))
1286 if (TREE_CODE (old_decl
) == FUNCTION_DECL
)
1288 if (DECL_BUILT_IN (old_decl
))
1290 /* Hide a built-in declaration. */
1291 DECL_DECLARED_CONSTEXPR_P (old_decl
)
1292 = DECL_DECLARED_CONSTEXPR_P (new_decl
);
1295 /* 7.1.5 [dcl.constexpr]
1296 Note: An explicit specialization can differ from the template
1297 declaration with respect to the constexpr specifier. */
1298 if (! DECL_TEMPLATE_SPECIALIZATION (old_decl
)
1299 && DECL_TEMPLATE_SPECIALIZATION (new_decl
))
1302 error_at (DECL_SOURCE_LOCATION (new_decl
),
1303 "redeclaration %qD differs in %<constexpr%> "
1304 "from previous declaration", new_decl
);
1305 inform (DECL_SOURCE_LOCATION (old_decl
),
1306 "previous declaration %qD", old_decl
);
1312 // If OLDDECL and NEWDECL are concept declarations with the same type
1313 // (i.e., and template parameters), but different requirements,
1314 // emit diagnostics and return true. Otherwise, return false.
1316 check_concept_refinement (tree olddecl
, tree newdecl
)
1318 if (!DECL_DECLARED_CONCEPT_P (olddecl
) || !DECL_DECLARED_CONCEPT_P (newdecl
))
1321 tree d1
= DECL_TEMPLATE_RESULT (olddecl
);
1322 tree d2
= DECL_TEMPLATE_RESULT (newdecl
);
1323 if (TREE_CODE (d1
) != TREE_CODE (d2
))
1326 tree t1
= TREE_TYPE (d1
);
1327 tree t2
= TREE_TYPE (d2
);
1328 if (TREE_CODE (d1
) == FUNCTION_DECL
)
1330 if (compparms (TYPE_ARG_TYPES (t1
), TYPE_ARG_TYPES (t2
))
1331 && comp_template_parms (DECL_TEMPLATE_PARMS (olddecl
),
1332 DECL_TEMPLATE_PARMS (newdecl
))
1333 && !equivalently_constrained (olddecl
, newdecl
))
1335 error ("cannot specialize concept %q#D", olddecl
);
1342 /* DECL is a redeclaration of a function or function template. If
1343 it does have default arguments issue a diagnostic. Note: this
1344 function is used to enforce the requirements in C++11 8.3.6 about
1345 no default arguments in redeclarations. */
1348 check_redeclaration_no_default_args (tree decl
)
1350 gcc_assert (DECL_DECLARES_FUNCTION_P (decl
));
1352 for (tree t
= FUNCTION_FIRST_USER_PARMTYPE (decl
);
1353 t
&& t
!= void_list_node
; t
= TREE_CHAIN (t
))
1354 if (TREE_PURPOSE (t
))
1356 permerror (DECL_SOURCE_LOCATION (decl
),
1357 "redeclaration of %q#D may not have default "
1363 #define GNU_INLINE_P(fn) (DECL_DECLARED_INLINE_P (fn) \
1364 && lookup_attribute ("gnu_inline", \
1365 DECL_ATTRIBUTES (fn)))
1367 /* If NEWDECL is a redeclaration of OLDDECL, merge the declarations.
1368 If the redeclaration is invalid, a diagnostic is issued, and the
1369 error_mark_node is returned. Otherwise, OLDDECL is returned.
1371 If NEWDECL is not a redeclaration of OLDDECL, NULL_TREE is
1374 NEWDECL_IS_FRIEND is true if NEWDECL was declared as a friend. */
1377 duplicate_decls (tree newdecl
, tree olddecl
, bool newdecl_is_friend
)
1379 unsigned olddecl_uid
= DECL_UID (olddecl
);
1380 int olddecl_friend
= 0, types_match
= 0, hidden_friend
= 0;
1381 int new_defines_function
= 0;
1382 tree new_template_info
;
1384 if (newdecl
== olddecl
)
1387 types_match
= decls_match (newdecl
, olddecl
);
1389 /* If either the type of the new decl or the type of the old decl is an
1390 error_mark_node, then that implies that we have already issued an
1391 error (earlier) for some bogus type specification, and in that case,
1392 it is rather pointless to harass the user with yet more error message
1393 about the same declaration, so just pretend the types match here. */
1394 if (TREE_TYPE (newdecl
) == error_mark_node
1395 || TREE_TYPE (olddecl
) == error_mark_node
)
1396 return error_mark_node
;
1398 if (UDLIT_OPER_P (DECL_NAME (newdecl
))
1399 && UDLIT_OPER_P (DECL_NAME (olddecl
)))
1401 if (TREE_CODE (newdecl
) == TEMPLATE_DECL
1402 && TREE_CODE (olddecl
) != TEMPLATE_DECL
1403 && check_raw_literal_operator (olddecl
))
1404 error ("literal operator template %q+D conflicts with"
1405 " raw literal operator %qD", newdecl
, olddecl
);
1406 else if (TREE_CODE (newdecl
) != TEMPLATE_DECL
1407 && TREE_CODE (olddecl
) == TEMPLATE_DECL
1408 && check_raw_literal_operator (newdecl
))
1409 error ("raw literal operator %q+D conflicts with"
1410 " literal operator template %qD", newdecl
, olddecl
);
1413 if (DECL_P (olddecl
)
1414 && TREE_CODE (newdecl
) == FUNCTION_DECL
1415 && TREE_CODE (olddecl
) == FUNCTION_DECL
1416 && diagnose_mismatched_attributes (olddecl
, newdecl
))
1418 if (DECL_INITIAL (olddecl
))
1419 inform (DECL_SOURCE_LOCATION (olddecl
),
1420 "previous definition of %qD was here", olddecl
);
1422 inform (DECL_SOURCE_LOCATION (olddecl
),
1423 "previous declaration of %qD was here", olddecl
);
1426 /* Check for redeclaration and other discrepancies. */
1427 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1428 && DECL_ARTIFICIAL (olddecl
))
1430 gcc_assert (!DECL_HIDDEN_FRIEND_P (olddecl
));
1431 if (TREE_CODE (newdecl
) != FUNCTION_DECL
)
1433 /* Avoid warnings redeclaring built-ins which have not been
1434 explicitly declared. */
1435 if (DECL_ANTICIPATED (olddecl
))
1437 if (TREE_PUBLIC (newdecl
)
1438 && CP_DECL_CONTEXT (newdecl
) == global_namespace
)
1439 warning_at (DECL_SOURCE_LOCATION (newdecl
),
1440 OPT_Wbuiltin_declaration_mismatch
,
1441 "built-in function %qD declared as non-function",
1446 /* If you declare a built-in or predefined function name as static,
1447 the old definition is overridden, but optionally warn this was a
1448 bad choice of name. */
1449 if (! TREE_PUBLIC (newdecl
))
1451 warning (OPT_Wshadow
,
1452 DECL_BUILT_IN (olddecl
)
1453 ? G_("shadowing built-in function %q#D")
1454 : G_("shadowing library function %q#D"), olddecl
);
1455 /* Discard the old built-in function. */
1458 /* If the built-in is not ansi, then programs can override
1459 it even globally without an error. */
1460 else if (! DECL_BUILT_IN (olddecl
))
1461 warning_at (DECL_SOURCE_LOCATION (newdecl
), 0,
1462 "library function %q#D redeclared as non-function %q#D",
1465 error ("declaration of %q+#D conflicts with built-in "
1466 "declaration %q#D", newdecl
, olddecl
);
1469 else if (DECL_OMP_DECLARE_REDUCTION_P (olddecl
))
1471 gcc_assert (DECL_OMP_DECLARE_REDUCTION_P (newdecl
));
1472 error_at (DECL_SOURCE_LOCATION (newdecl
),
1473 "redeclaration of %<pragma omp declare reduction%>");
1474 inform (DECL_SOURCE_LOCATION (olddecl
),
1475 "previous %<pragma omp declare reduction%> declaration");
1476 return error_mark_node
;
1478 else if (!types_match
)
1480 /* Avoid warnings redeclaring built-ins which have not been
1481 explicitly declared. */
1482 if (DECL_ANTICIPATED (olddecl
))
1486 /* A new declaration doesn't match a built-in one unless it
1487 is also extern "C". */
1488 gcc_assert (DECL_IS_BUILTIN (olddecl
));
1489 gcc_assert (DECL_EXTERN_C_P (olddecl
));
1490 if (!DECL_EXTERN_C_P (newdecl
))
1493 for (t1
= TYPE_ARG_TYPES (TREE_TYPE (newdecl
)),
1494 t2
= TYPE_ARG_TYPES (TREE_TYPE (olddecl
));
1496 t1
= TREE_CHAIN (t1
), t2
= TREE_CHAIN (t2
))
1500 /* FILE, tm types are not known at the time
1501 we create the builtins. */
1502 for (unsigned i
= 0;
1503 i
< sizeof (builtin_structptr_types
)
1504 / sizeof (builtin_structptr_type
);
1506 if (TREE_VALUE (t2
) == builtin_structptr_types
[i
].node
)
1508 tree t
= TREE_VALUE (t1
);
1511 && TYPE_IDENTIFIER (TREE_TYPE (t
))
1512 == get_identifier (builtin_structptr_types
[i
].str
)
1513 && compparms (TREE_CHAIN (t1
), TREE_CHAIN (t2
)))
1515 tree oldargs
= TYPE_ARG_TYPES (TREE_TYPE (olddecl
));
1517 TYPE_ARG_TYPES (TREE_TYPE (olddecl
))
1518 = TYPE_ARG_TYPES (TREE_TYPE (newdecl
));
1519 types_match
= decls_match (newdecl
, olddecl
);
1521 return duplicate_decls (newdecl
, olddecl
,
1523 TYPE_ARG_TYPES (TREE_TYPE (olddecl
)) = oldargs
;
1528 if (! same_type_p (TREE_VALUE (t1
), TREE_VALUE (t2
)))
1533 warning_at (DECL_SOURCE_LOCATION (newdecl
),
1534 OPT_Wbuiltin_declaration_mismatch
,
1535 "declaration of %q#D conflicts with built-in "
1536 "declaration %q#D", newdecl
, olddecl
);
1538 else if ((DECL_EXTERN_C_P (newdecl
)
1539 && DECL_EXTERN_C_P (olddecl
))
1540 || compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl
)),
1541 TYPE_ARG_TYPES (TREE_TYPE (olddecl
))))
1543 /* A near match; override the builtin. */
1545 if (TREE_PUBLIC (newdecl
))
1546 warning_at (DECL_SOURCE_LOCATION (newdecl
),
1547 OPT_Wbuiltin_declaration_mismatch
,
1548 "new declaration %q#D ambiguates built-in "
1549 "declaration %q#D", newdecl
, olddecl
);
1551 warning (OPT_Wshadow
,
1552 DECL_BUILT_IN (olddecl
)
1553 ? G_("shadowing built-in function %q#D")
1554 : G_("shadowing library function %q#D"), olddecl
);
1557 /* Discard the old built-in function. */
1560 /* Replace the old RTL to avoid problems with inlining. */
1561 COPY_DECL_RTL (newdecl
, olddecl
);
1563 /* Even if the types match, prefer the new declarations type for
1564 built-ins which have not been explicitly declared, for
1565 exception lists, etc... */
1566 else if (DECL_IS_BUILTIN (olddecl
))
1568 tree type
= TREE_TYPE (newdecl
);
1569 tree attribs
= (*targetm
.merge_type_attributes
)
1570 (TREE_TYPE (olddecl
), type
);
1572 type
= cp_build_type_attribute_variant (type
, attribs
);
1573 TREE_TYPE (newdecl
) = TREE_TYPE (olddecl
) = type
;
1576 /* If a function is explicitly declared "throw ()", propagate that to
1577 the corresponding builtin. */
1578 if (DECL_BUILT_IN_CLASS (olddecl
) == BUILT_IN_NORMAL
1579 && DECL_ANTICIPATED (olddecl
)
1580 && TREE_NOTHROW (newdecl
)
1581 && !TREE_NOTHROW (olddecl
))
1583 enum built_in_function fncode
= DECL_FUNCTION_CODE (olddecl
);
1584 tree tmpdecl
= builtin_decl_explicit (fncode
);
1585 if (tmpdecl
&& tmpdecl
!= olddecl
&& types_match
)
1586 TREE_NOTHROW (tmpdecl
) = 1;
1589 /* Whether or not the builtin can throw exceptions has no
1590 bearing on this declarator. */
1591 TREE_NOTHROW (olddecl
) = 0;
1593 if (DECL_THIS_STATIC (newdecl
) && !DECL_THIS_STATIC (olddecl
))
1595 /* If a builtin function is redeclared as `static', merge
1596 the declarations, but make the original one static. */
1597 DECL_THIS_STATIC (olddecl
) = 1;
1598 TREE_PUBLIC (olddecl
) = 0;
1600 /* Make the old declaration consistent with the new one so
1601 that all remnants of the builtin-ness of this function
1602 will be banished. */
1603 SET_DECL_LANGUAGE (olddecl
, DECL_LANGUAGE (newdecl
));
1604 COPY_DECL_RTL (newdecl
, olddecl
);
1607 else if (TREE_CODE (olddecl
) != TREE_CODE (newdecl
))
1609 /* C++ Standard, 3.3, clause 4:
1610 "[Note: a namespace name or a class template name must be unique
1611 in its declarative region (7.3.2, clause 14). ]" */
1612 if (TREE_CODE (olddecl
) != NAMESPACE_DECL
1613 && TREE_CODE (newdecl
) != NAMESPACE_DECL
1614 && (TREE_CODE (olddecl
) != TEMPLATE_DECL
1615 || TREE_CODE (DECL_TEMPLATE_RESULT (olddecl
)) != TYPE_DECL
)
1616 && (TREE_CODE (newdecl
) != TEMPLATE_DECL
1617 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl
)) != TYPE_DECL
))
1619 if ((TREE_CODE (olddecl
) == TYPE_DECL
&& DECL_ARTIFICIAL (olddecl
)
1620 && TREE_CODE (newdecl
) != TYPE_DECL
)
1621 || (TREE_CODE (newdecl
) == TYPE_DECL
&& DECL_ARTIFICIAL (newdecl
)
1622 && TREE_CODE (olddecl
) != TYPE_DECL
))
1624 /* We do nothing special here, because C++ does such nasty
1625 things with TYPE_DECLs. Instead, just let the TYPE_DECL
1626 get shadowed, and know that if we need to find a TYPE_DECL
1627 for a given name, we can look in the IDENTIFIER_TYPE_VALUE
1628 slot of the identifier. */
1632 if ((TREE_CODE (newdecl
) == FUNCTION_DECL
1633 && DECL_FUNCTION_TEMPLATE_P (olddecl
))
1634 || (TREE_CODE (olddecl
) == FUNCTION_DECL
1635 && DECL_FUNCTION_TEMPLATE_P (newdecl
)))
1639 error ("%q#D redeclared as different kind of symbol", newdecl
);
1640 if (TREE_CODE (olddecl
) == TREE_LIST
)
1641 olddecl
= TREE_VALUE (olddecl
);
1642 inform (DECL_SOURCE_LOCATION (olddecl
),
1643 "previous declaration %q#D", olddecl
);
1645 return error_mark_node
;
1647 else if (!types_match
)
1649 if (CP_DECL_CONTEXT (newdecl
) != CP_DECL_CONTEXT (olddecl
))
1650 /* These are certainly not duplicate declarations; they're
1651 from different scopes. */
1654 if (TREE_CODE (newdecl
) == TEMPLATE_DECL
)
1656 /* The name of a class template may not be declared to refer to
1657 any other template, class, function, object, namespace, value,
1658 or type in the same scope. */
1659 if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl
)) == TYPE_DECL
1660 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl
)) == TYPE_DECL
)
1662 error ("conflicting declaration of template %q+#D", newdecl
);
1663 inform (DECL_SOURCE_LOCATION (olddecl
),
1664 "previous declaration %q#D", olddecl
);
1665 return error_mark_node
;
1667 else if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl
)) == FUNCTION_DECL
1668 && TREE_CODE (DECL_TEMPLATE_RESULT (newdecl
)) == FUNCTION_DECL
1669 && compparms (TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl
))),
1670 TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl
))))
1671 && comp_template_parms (DECL_TEMPLATE_PARMS (newdecl
),
1672 DECL_TEMPLATE_PARMS (olddecl
))
1673 /* Template functions can be disambiguated by
1675 && same_type_p (TREE_TYPE (TREE_TYPE (newdecl
)),
1676 TREE_TYPE (TREE_TYPE (olddecl
)))
1677 // Template functions can also be disambiguated by
1679 && equivalently_constrained (olddecl
, newdecl
))
1681 error ("ambiguating new declaration %q+#D", newdecl
);
1682 inform (DECL_SOURCE_LOCATION (olddecl
),
1683 "old declaration %q#D", olddecl
);
1685 else if (check_concept_refinement (olddecl
, newdecl
))
1686 return error_mark_node
;
1689 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1691 if (DECL_EXTERN_C_P (newdecl
) && DECL_EXTERN_C_P (olddecl
))
1693 error ("conflicting declaration of C function %q+#D",
1695 inform (DECL_SOURCE_LOCATION (olddecl
),
1696 "previous declaration %q#D", olddecl
);
1699 /* For function versions, params and types match, but they
1700 are not ambiguous. */
1701 else if ((!DECL_FUNCTION_VERSIONED (newdecl
)
1702 && !DECL_FUNCTION_VERSIONED (olddecl
))
1703 // The functions have the same parameter types.
1704 && compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl
)),
1705 TYPE_ARG_TYPES (TREE_TYPE (olddecl
)))
1706 // And the same constraints.
1707 && equivalently_constrained (newdecl
, olddecl
))
1709 error ("ambiguating new declaration of %q+#D", newdecl
);
1710 inform (DECL_SOURCE_LOCATION (olddecl
),
1711 "old declaration %q#D", olddecl
);
1712 return error_mark_node
;
1719 error ("conflicting declaration %q+#D", newdecl
);
1720 inform (DECL_SOURCE_LOCATION (olddecl
),
1721 "previous declaration as %q#D", olddecl
);
1722 return error_mark_node
;
1725 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
1726 && ((DECL_TEMPLATE_SPECIALIZATION (olddecl
)
1727 && (!DECL_TEMPLATE_INFO (newdecl
)
1728 || (DECL_TI_TEMPLATE (newdecl
)
1729 != DECL_TI_TEMPLATE (olddecl
))))
1730 || (DECL_TEMPLATE_SPECIALIZATION (newdecl
)
1731 && (!DECL_TEMPLATE_INFO (olddecl
)
1732 || (DECL_TI_TEMPLATE (olddecl
)
1733 != DECL_TI_TEMPLATE (newdecl
))))))
1734 /* It's OK to have a template specialization and a non-template
1735 with the same type, or to have specializations of two
1736 different templates with the same type. Note that if one is a
1737 specialization, and the other is an instantiation of the same
1738 template, that we do not exit at this point. That situation
1739 can occur if we instantiate a template class, and then
1740 specialize one of its methods. This situation is valid, but
1741 the declarations must be merged in the usual way. */
1743 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
1744 && ((DECL_TEMPLATE_INSTANTIATION (olddecl
)
1745 && !DECL_USE_TEMPLATE (newdecl
))
1746 || (DECL_TEMPLATE_INSTANTIATION (newdecl
)
1747 && !DECL_USE_TEMPLATE (olddecl
))))
1748 /* One of the declarations is a template instantiation, and the
1749 other is not a template at all. That's OK. */
1751 else if (TREE_CODE (newdecl
) == NAMESPACE_DECL
)
1753 /* In [namespace.alias] we have:
1755 In a declarative region, a namespace-alias-definition can be
1756 used to redefine a namespace-alias declared in that declarative
1757 region to refer only to the namespace to which it already
1760 Therefore, if we encounter a second alias directive for the same
1761 alias, we can just ignore the second directive. */
1762 if (DECL_NAMESPACE_ALIAS (newdecl
)
1763 && (DECL_NAMESPACE_ALIAS (newdecl
)
1764 == DECL_NAMESPACE_ALIAS (olddecl
)))
1767 /* Leave it to update_binding to merge or report error. */
1772 const char *errmsg
= redeclaration_error_message (newdecl
, olddecl
);
1775 error_at (DECL_SOURCE_LOCATION (newdecl
), errmsg
, newdecl
);
1776 if (DECL_NAME (olddecl
) != NULL_TREE
)
1777 inform (DECL_SOURCE_LOCATION (olddecl
),
1778 (DECL_INITIAL (olddecl
) && namespace_bindings_p ())
1779 ? G_("%q#D previously defined here")
1780 : G_("%q#D previously declared here"), olddecl
);
1781 return error_mark_node
;
1783 else if (TREE_CODE (olddecl
) == FUNCTION_DECL
1784 && DECL_INITIAL (olddecl
) != NULL_TREE
1785 && !prototype_p (TREE_TYPE (olddecl
))
1786 && prototype_p (TREE_TYPE (newdecl
)))
1788 /* Prototype decl follows defn w/o prototype. */
1789 if (warning_at (DECL_SOURCE_LOCATION (newdecl
), 0,
1790 "prototype specified for %q#D", newdecl
))
1791 inform (DECL_SOURCE_LOCATION (olddecl
),
1792 "previous non-prototype definition here");
1794 else if (VAR_OR_FUNCTION_DECL_P (olddecl
)
1795 && DECL_LANGUAGE (newdecl
) != DECL_LANGUAGE (olddecl
))
1798 If two declarations of the same function or object
1799 specify different linkage-specifications ..., the program
1800 is ill-formed.... Except for functions with C++ linkage,
1801 a function declaration without a linkage specification
1802 shall not precede the first linkage specification for
1803 that function. A function can be declared without a
1804 linkage specification after an explicit linkage
1805 specification has been seen; the linkage explicitly
1806 specified in the earlier declaration is not affected by
1807 such a function declaration.
1809 DR 563 raises the question why the restrictions on
1810 functions should not also apply to objects. Older
1811 versions of G++ silently ignore the linkage-specification
1819 which is clearly wrong. Therefore, we now treat objects
1821 if (current_lang_depth () == 0)
1823 /* There is no explicit linkage-specification, so we use
1824 the linkage from the previous declaration. */
1825 retrofit_lang_decl (newdecl
);
1826 SET_DECL_LANGUAGE (newdecl
, DECL_LANGUAGE (olddecl
));
1830 error ("conflicting declaration of %q+#D with %qL linkage",
1831 newdecl
, DECL_LANGUAGE (newdecl
));
1832 inform (DECL_SOURCE_LOCATION (olddecl
),
1833 "previous declaration with %qL linkage",
1834 DECL_LANGUAGE (olddecl
));
1838 if (DECL_LANG_SPECIFIC (olddecl
) && DECL_USE_TEMPLATE (olddecl
))
1840 else if (TREE_CODE (olddecl
) == FUNCTION_DECL
)
1842 /* Note: free functions, as TEMPLATE_DECLs, are handled below. */
1843 if (DECL_FUNCTION_MEMBER_P (olddecl
)
1844 && (/* grokfndecl passes member function templates too
1845 as FUNCTION_DECLs. */
1846 DECL_TEMPLATE_INFO (olddecl
)
1848 Default arguments for a member function of a class
1849 template shall be specified on the initial declaration
1850 of the member function within the class template. */
1851 || CLASSTYPE_TEMPLATE_INFO (CP_DECL_CONTEXT (olddecl
))))
1852 check_redeclaration_no_default_args (newdecl
);
1855 tree t1
= FUNCTION_FIRST_USER_PARMTYPE (olddecl
);
1856 tree t2
= FUNCTION_FIRST_USER_PARMTYPE (newdecl
);
1859 for (; t1
&& t1
!= void_list_node
;
1860 t1
= TREE_CHAIN (t1
), t2
= TREE_CHAIN (t2
), i
++)
1861 if (TREE_PURPOSE (t1
) && TREE_PURPOSE (t2
))
1863 if (1 == simple_cst_equal (TREE_PURPOSE (t1
),
1866 if (permerror (input_location
,
1867 "default argument given for parameter "
1868 "%d of %q#D", i
, newdecl
))
1869 inform (DECL_SOURCE_LOCATION (olddecl
),
1870 "previous specification in %q#D here",
1875 error ("default argument given for parameter %d "
1876 "of %q#D", i
, newdecl
);
1877 inform (DECL_SOURCE_LOCATION (olddecl
),
1878 "previous specification in %q#D here",
1886 /* Do not merge an implicit typedef with an explicit one. In:
1890 typedef class A A __attribute__ ((foo));
1892 the attribute should apply only to the typedef. */
1893 if (TREE_CODE (olddecl
) == TYPE_DECL
1894 && (DECL_IMPLICIT_TYPEDEF_P (olddecl
)
1895 || DECL_IMPLICIT_TYPEDEF_P (newdecl
)))
1898 /* If new decl is `static' and an `extern' was seen previously,
1900 warn_extern_redeclared_static (newdecl
, olddecl
);
1902 if (!validate_constexpr_redeclaration (olddecl
, newdecl
))
1903 return error_mark_node
;
1905 /* We have committed to returning 1 at this point. */
1906 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1908 /* Now that functions must hold information normally held
1909 by field decls, there is extra work to do so that
1910 declaration information does not get destroyed during
1912 if (DECL_VINDEX (olddecl
))
1913 DECL_VINDEX (newdecl
) = DECL_VINDEX (olddecl
);
1914 if (DECL_CONTEXT (olddecl
))
1915 DECL_CONTEXT (newdecl
) = DECL_CONTEXT (olddecl
);
1916 DECL_STATIC_CONSTRUCTOR (newdecl
) |= DECL_STATIC_CONSTRUCTOR (olddecl
);
1917 DECL_STATIC_DESTRUCTOR (newdecl
) |= DECL_STATIC_DESTRUCTOR (olddecl
);
1918 DECL_PURE_VIRTUAL_P (newdecl
) |= DECL_PURE_VIRTUAL_P (olddecl
);
1919 DECL_VIRTUAL_P (newdecl
) |= DECL_VIRTUAL_P (olddecl
);
1920 DECL_INVALID_OVERRIDER_P (newdecl
) |= DECL_INVALID_OVERRIDER_P (olddecl
);
1921 DECL_FINAL_P (newdecl
) |= DECL_FINAL_P (olddecl
);
1922 DECL_OVERRIDE_P (newdecl
) |= DECL_OVERRIDE_P (olddecl
);
1923 DECL_THIS_STATIC (newdecl
) |= DECL_THIS_STATIC (olddecl
);
1924 if (DECL_OVERLOADED_OPERATOR_P (olddecl
) != ERROR_MARK
)
1925 SET_OVERLOADED_OPERATOR_CODE
1926 (newdecl
, DECL_OVERLOADED_OPERATOR_P (olddecl
));
1927 new_defines_function
= DECL_INITIAL (newdecl
) != NULL_TREE
;
1929 /* Optionally warn about more than one declaration for the same
1930 name, but don't warn about a function declaration followed by a
1932 if (warn_redundant_decls
&& ! DECL_ARTIFICIAL (olddecl
)
1933 && !(new_defines_function
&& DECL_INITIAL (olddecl
) == NULL_TREE
)
1934 /* Don't warn about extern decl followed by definition. */
1935 && !(DECL_EXTERNAL (olddecl
) && ! DECL_EXTERNAL (newdecl
))
1936 /* Don't warn about friends, let add_friend take care of it. */
1937 && ! (newdecl_is_friend
|| DECL_FRIEND_P (olddecl
))
1938 /* Don't warn about declaration followed by specialization. */
1939 && (! DECL_TEMPLATE_SPECIALIZATION (newdecl
)
1940 || DECL_TEMPLATE_SPECIALIZATION (olddecl
)))
1942 if (warning_at (DECL_SOURCE_LOCATION (newdecl
),
1943 OPT_Wredundant_decls
,
1944 "redundant redeclaration of %qD in same scope",
1946 inform (DECL_SOURCE_LOCATION (olddecl
),
1947 "previous declaration of %qD", olddecl
);
1950 if (!(DECL_TEMPLATE_INSTANTIATION (olddecl
)
1951 && DECL_TEMPLATE_SPECIALIZATION (newdecl
)))
1953 if (DECL_DELETED_FN (newdecl
))
1955 error ("deleted definition of %q+D", newdecl
);
1956 inform (DECL_SOURCE_LOCATION (olddecl
),
1957 "previous declaration of %qD", olddecl
);
1959 DECL_DELETED_FN (newdecl
) |= DECL_DELETED_FN (olddecl
);
1963 /* Deal with C++: must preserve virtual function table size. */
1964 if (TREE_CODE (olddecl
) == TYPE_DECL
)
1966 tree newtype
= TREE_TYPE (newdecl
);
1967 tree oldtype
= TREE_TYPE (olddecl
);
1969 if (newtype
!= error_mark_node
&& oldtype
!= error_mark_node
1970 && TYPE_LANG_SPECIFIC (newtype
) && TYPE_LANG_SPECIFIC (oldtype
))
1971 CLASSTYPE_FRIEND_CLASSES (newtype
)
1972 = CLASSTYPE_FRIEND_CLASSES (oldtype
);
1974 DECL_ORIGINAL_TYPE (newdecl
) = DECL_ORIGINAL_TYPE (olddecl
);
1977 /* Copy all the DECL_... slots specified in the new decl
1978 except for any that we copy here from the old type. */
1979 DECL_ATTRIBUTES (newdecl
)
1980 = (*targetm
.merge_decl_attributes
) (olddecl
, newdecl
);
1982 if (DECL_DECLARES_FUNCTION_P (olddecl
) && DECL_DECLARES_FUNCTION_P (newdecl
))
1984 olddecl_friend
= DECL_FRIEND_P (olddecl
);
1985 hidden_friend
= (DECL_ANTICIPATED (olddecl
)
1986 && DECL_HIDDEN_FRIEND_P (olddecl
)
1987 && newdecl_is_friend
);
1990 DECL_ANTICIPATED (olddecl
) = 0;
1991 DECL_HIDDEN_FRIEND_P (olddecl
) = 0;
1995 if (TREE_CODE (newdecl
) == TEMPLATE_DECL
)
1999 old_result
= DECL_TEMPLATE_RESULT (olddecl
);
2000 new_result
= DECL_TEMPLATE_RESULT (newdecl
);
2001 TREE_TYPE (olddecl
) = TREE_TYPE (old_result
);
2002 DECL_TEMPLATE_SPECIALIZATIONS (olddecl
)
2003 = chainon (DECL_TEMPLATE_SPECIALIZATIONS (olddecl
),
2004 DECL_TEMPLATE_SPECIALIZATIONS (newdecl
));
2006 DECL_ATTRIBUTES (old_result
)
2007 = (*targetm
.merge_decl_attributes
) (old_result
, new_result
);
2009 if (DECL_FUNCTION_TEMPLATE_P (newdecl
))
2011 /* Per C++11 8.3.6/4, default arguments cannot be added in later
2012 declarations of a function template. */
2013 if (DECL_SOURCE_LOCATION (newdecl
)
2014 != DECL_SOURCE_LOCATION (olddecl
))
2015 check_redeclaration_no_default_args (newdecl
);
2017 check_default_args (newdecl
);
2019 if (GNU_INLINE_P (old_result
) != GNU_INLINE_P (new_result
)
2020 && DECL_INITIAL (new_result
))
2022 if (DECL_INITIAL (old_result
))
2023 DECL_UNINLINABLE (old_result
) = 1;
2025 DECL_UNINLINABLE (old_result
) = DECL_UNINLINABLE (new_result
);
2026 DECL_EXTERNAL (old_result
) = DECL_EXTERNAL (new_result
);
2027 DECL_NOT_REALLY_EXTERN (old_result
)
2028 = DECL_NOT_REALLY_EXTERN (new_result
);
2029 DECL_INTERFACE_KNOWN (old_result
)
2030 = DECL_INTERFACE_KNOWN (new_result
);
2031 DECL_DECLARED_INLINE_P (old_result
)
2032 = DECL_DECLARED_INLINE_P (new_result
);
2033 DECL_DISREGARD_INLINE_LIMITS (old_result
)
2034 |= DECL_DISREGARD_INLINE_LIMITS (new_result
);
2039 DECL_DECLARED_INLINE_P (old_result
)
2040 |= DECL_DECLARED_INLINE_P (new_result
);
2041 DECL_DISREGARD_INLINE_LIMITS (old_result
)
2042 |= DECL_DISREGARD_INLINE_LIMITS (new_result
);
2043 check_redeclaration_exception_specification (newdecl
, olddecl
);
2047 /* If the new declaration is a definition, update the file and
2048 line information on the declaration, and also make
2049 the old declaration the same definition. */
2050 if (DECL_INITIAL (new_result
) != NULL_TREE
)
2052 DECL_SOURCE_LOCATION (olddecl
)
2053 = DECL_SOURCE_LOCATION (old_result
)
2054 = DECL_SOURCE_LOCATION (newdecl
);
2055 DECL_INITIAL (old_result
) = DECL_INITIAL (new_result
);
2056 if (DECL_FUNCTION_TEMPLATE_P (newdecl
))
2059 DECL_ARGUMENTS (old_result
)
2060 = DECL_ARGUMENTS (new_result
);
2061 for (parm
= DECL_ARGUMENTS (old_result
); parm
;
2062 parm
= DECL_CHAIN (parm
))
2063 DECL_CONTEXT (parm
) = old_result
;
2072 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2073 check_redeclaration_exception_specification (newdecl
, olddecl
);
2075 /* Automatically handles default parameters. */
2076 tree oldtype
= TREE_TYPE (olddecl
);
2079 /* For typedefs use the old type, as the new type's DECL_NAME points
2080 at newdecl, which will be ggc_freed. */
2081 if (TREE_CODE (newdecl
) == TYPE_DECL
)
2083 /* But NEWTYPE might have an attribute, honor that. */
2084 tree tem
= TREE_TYPE (newdecl
);
2087 if (TYPE_USER_ALIGN (tem
))
2089 if (TYPE_ALIGN (tem
) > TYPE_ALIGN (newtype
))
2090 SET_TYPE_ALIGN (newtype
, TYPE_ALIGN (tem
));
2091 TYPE_USER_ALIGN (newtype
) = true;
2094 /* And remove the new type from the variants list. */
2095 if (TYPE_NAME (TREE_TYPE (newdecl
)) == newdecl
)
2097 tree remove
= TREE_TYPE (newdecl
);
2098 for (tree t
= TYPE_MAIN_VARIANT (remove
); ;
2099 t
= TYPE_NEXT_VARIANT (t
))
2100 if (TYPE_NEXT_VARIANT (t
) == remove
)
2102 TYPE_NEXT_VARIANT (t
) = TYPE_NEXT_VARIANT (remove
);
2108 /* Merge the data types specified in the two decls. */
2109 newtype
= merge_types (TREE_TYPE (newdecl
), TREE_TYPE (olddecl
));
2111 if (VAR_P (newdecl
))
2113 DECL_THIS_EXTERN (newdecl
) |= DECL_THIS_EXTERN (olddecl
);
2114 /* For already initialized vars, TREE_READONLY could have been
2115 cleared in cp_finish_decl, because the var needs runtime
2116 initialization or destruction. Make sure not to set
2117 TREE_READONLY on it again. */
2118 if (DECL_INITIALIZED_P (olddecl
)
2119 && !DECL_EXTERNAL (olddecl
)
2120 && !TREE_READONLY (olddecl
))
2121 TREE_READONLY (newdecl
) = 0;
2122 DECL_INITIALIZED_P (newdecl
) |= DECL_INITIALIZED_P (olddecl
);
2123 DECL_NONTRIVIALLY_INITIALIZED_P (newdecl
)
2124 |= DECL_NONTRIVIALLY_INITIALIZED_P (olddecl
);
2125 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (newdecl
)
2126 |= DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (olddecl
);
2127 if (DECL_CLASS_SCOPE_P (olddecl
))
2128 DECL_DECLARED_CONSTEXPR_P (newdecl
)
2129 |= DECL_DECLARED_CONSTEXPR_P (olddecl
);
2131 /* Merge the threadprivate attribute from OLDDECL into NEWDECL. */
2132 if (DECL_LANG_SPECIFIC (olddecl
)
2133 && CP_DECL_THREADPRIVATE_P (olddecl
))
2135 /* Allocate a LANG_SPECIFIC structure for NEWDECL, if needed. */
2136 retrofit_lang_decl (newdecl
);
2137 CP_DECL_THREADPRIVATE_P (newdecl
) = 1;
2141 /* An explicit specialization of a function template or of a member
2142 function of a class template can be declared transaction_safe
2143 independently of whether the corresponding template entity is declared
2144 transaction_safe. */
2145 if (flag_tm
&& TREE_CODE (newdecl
) == FUNCTION_DECL
2146 && DECL_TEMPLATE_INSTANTIATION (olddecl
)
2147 && DECL_TEMPLATE_SPECIALIZATION (newdecl
)
2148 && tx_safe_fn_type_p (newtype
)
2149 && !tx_safe_fn_type_p (TREE_TYPE (newdecl
)))
2150 newtype
= tx_unsafe_fn_variant (newtype
);
2152 TREE_TYPE (newdecl
) = TREE_TYPE (olddecl
) = newtype
;
2154 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2155 check_default_args (newdecl
);
2157 /* Lay the type out, unless already done. */
2158 if (! same_type_p (newtype
, oldtype
)
2159 && TREE_TYPE (newdecl
) != error_mark_node
2160 && !(processing_template_decl
&& uses_template_parms (newdecl
)))
2161 layout_type (TREE_TYPE (newdecl
));
2163 if ((VAR_P (newdecl
)
2164 || TREE_CODE (newdecl
) == PARM_DECL
2165 || TREE_CODE (newdecl
) == RESULT_DECL
2166 || TREE_CODE (newdecl
) == FIELD_DECL
2167 || TREE_CODE (newdecl
) == TYPE_DECL
)
2168 && !(processing_template_decl
&& uses_template_parms (newdecl
)))
2169 layout_decl (newdecl
, 0);
2171 /* Merge the type qualifiers. */
2172 if (TREE_READONLY (newdecl
))
2173 TREE_READONLY (olddecl
) = 1;
2174 if (TREE_THIS_VOLATILE (newdecl
))
2175 TREE_THIS_VOLATILE (olddecl
) = 1;
2176 if (TREE_NOTHROW (newdecl
))
2177 TREE_NOTHROW (olddecl
) = 1;
2179 /* Merge deprecatedness. */
2180 if (TREE_DEPRECATED (newdecl
))
2181 TREE_DEPRECATED (olddecl
) = 1;
2183 /* Preserve function specific target and optimization options */
2184 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2186 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl
)
2187 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl
))
2188 DECL_FUNCTION_SPECIFIC_TARGET (newdecl
)
2189 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl
);
2191 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl
)
2192 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl
))
2193 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl
)
2194 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl
);
2197 /* Merge the initialization information. */
2198 if (DECL_INITIAL (newdecl
) == NULL_TREE
2199 && DECL_INITIAL (olddecl
) != NULL_TREE
)
2201 DECL_INITIAL (newdecl
) = DECL_INITIAL (olddecl
);
2202 DECL_SOURCE_LOCATION (newdecl
) = DECL_SOURCE_LOCATION (olddecl
);
2203 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2205 DECL_SAVED_TREE (newdecl
) = DECL_SAVED_TREE (olddecl
);
2206 DECL_STRUCT_FUNCTION (newdecl
) = DECL_STRUCT_FUNCTION (olddecl
);
2210 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2212 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl
)
2213 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl
);
2214 DECL_NO_LIMIT_STACK (newdecl
) |= DECL_NO_LIMIT_STACK (olddecl
);
2215 TREE_THIS_VOLATILE (newdecl
) |= TREE_THIS_VOLATILE (olddecl
);
2216 TREE_NOTHROW (newdecl
) |= TREE_NOTHROW (olddecl
);
2217 DECL_IS_MALLOC (newdecl
) |= DECL_IS_MALLOC (olddecl
);
2218 DECL_IS_OPERATOR_NEW (newdecl
) |= DECL_IS_OPERATOR_NEW (olddecl
);
2219 DECL_PURE_P (newdecl
) |= DECL_PURE_P (olddecl
);
2220 TREE_READONLY (newdecl
) |= TREE_READONLY (olddecl
);
2221 DECL_LOOPING_CONST_OR_PURE_P (newdecl
)
2222 |= DECL_LOOPING_CONST_OR_PURE_P (olddecl
);
2223 /* Keep the old RTL. */
2224 COPY_DECL_RTL (olddecl
, newdecl
);
2226 else if (VAR_P (newdecl
)
2227 && (DECL_SIZE (olddecl
) || !DECL_SIZE (newdecl
)))
2229 /* Keep the old RTL. We cannot keep the old RTL if the old
2230 declaration was for an incomplete object and the new
2231 declaration is not since many attributes of the RTL will
2233 COPY_DECL_RTL (olddecl
, newdecl
);
2236 /* If cannot merge, then use the new type and qualifiers,
2237 and don't preserve the old rtl. */
2240 /* Clean out any memory we had of the old declaration. */
2241 tree oldstatic
= value_member (olddecl
, static_aggregates
);
2243 TREE_VALUE (oldstatic
) = error_mark_node
;
2245 TREE_TYPE (olddecl
) = TREE_TYPE (newdecl
);
2246 TREE_READONLY (olddecl
) = TREE_READONLY (newdecl
);
2247 TREE_THIS_VOLATILE (olddecl
) = TREE_THIS_VOLATILE (newdecl
);
2248 TREE_NOTHROW (olddecl
) = TREE_NOTHROW (newdecl
);
2249 TREE_SIDE_EFFECTS (olddecl
) = TREE_SIDE_EFFECTS (newdecl
);
2252 /* Merge the storage class information. */
2253 merge_weak (newdecl
, olddecl
);
2255 DECL_DEFER_OUTPUT (newdecl
) |= DECL_DEFER_OUTPUT (olddecl
);
2256 TREE_PUBLIC (newdecl
) = TREE_PUBLIC (olddecl
);
2257 TREE_STATIC (olddecl
) = TREE_STATIC (newdecl
) |= TREE_STATIC (olddecl
);
2258 if (! DECL_EXTERNAL (olddecl
))
2259 DECL_EXTERNAL (newdecl
) = 0;
2260 if (! DECL_COMDAT (olddecl
))
2261 DECL_COMDAT (newdecl
) = 0;
2263 new_template_info
= NULL_TREE
;
2264 if (DECL_LANG_SPECIFIC (newdecl
) && DECL_LANG_SPECIFIC (olddecl
))
2266 bool new_redefines_gnu_inline
= false;
2268 if (new_defines_function
2269 && ((DECL_INTERFACE_KNOWN (olddecl
)
2270 && TREE_CODE (olddecl
) == FUNCTION_DECL
)
2271 || (TREE_CODE (olddecl
) == TEMPLATE_DECL
2272 && (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl
))
2273 == FUNCTION_DECL
))))
2277 if (TREE_CODE (fn
) == TEMPLATE_DECL
)
2278 fn
= DECL_TEMPLATE_RESULT (olddecl
);
2280 new_redefines_gnu_inline
= GNU_INLINE_P (fn
) && DECL_INITIAL (fn
);
2283 if (!new_redefines_gnu_inline
)
2285 DECL_INTERFACE_KNOWN (newdecl
) |= DECL_INTERFACE_KNOWN (olddecl
);
2286 DECL_NOT_REALLY_EXTERN (newdecl
) |= DECL_NOT_REALLY_EXTERN (olddecl
);
2287 DECL_COMDAT (newdecl
) |= DECL_COMDAT (olddecl
);
2289 DECL_TEMPLATE_INSTANTIATED (newdecl
)
2290 |= DECL_TEMPLATE_INSTANTIATED (olddecl
);
2291 DECL_ODR_USED (newdecl
) |= DECL_ODR_USED (olddecl
);
2293 /* If the OLDDECL is an instantiation and/or specialization,
2294 then the NEWDECL must be too. But, it may not yet be marked
2295 as such if the caller has created NEWDECL, but has not yet
2296 figured out that it is a redeclaration. */
2297 if (!DECL_USE_TEMPLATE (newdecl
))
2298 DECL_USE_TEMPLATE (newdecl
) = DECL_USE_TEMPLATE (olddecl
);
2300 /* Don't really know how much of the language-specific
2301 values we should copy from old to new. */
2302 DECL_IN_AGGR_P (newdecl
) = DECL_IN_AGGR_P (olddecl
);
2303 DECL_REPO_AVAILABLE_P (newdecl
) = DECL_REPO_AVAILABLE_P (olddecl
);
2304 DECL_INITIALIZED_IN_CLASS_P (newdecl
)
2305 |= DECL_INITIALIZED_IN_CLASS_P (olddecl
);
2307 if (LANG_DECL_HAS_MIN (newdecl
))
2309 DECL_LANG_SPECIFIC (newdecl
)->u
.min
.u2
=
2310 DECL_LANG_SPECIFIC (olddecl
)->u
.min
.u2
;
2311 if (DECL_TEMPLATE_INFO (newdecl
))
2313 new_template_info
= DECL_TEMPLATE_INFO (newdecl
);
2314 if (DECL_TEMPLATE_INSTANTIATION (olddecl
)
2315 && DECL_TEMPLATE_SPECIALIZATION (newdecl
))
2316 /* Remember the presence of explicit specialization args. */
2317 TINFO_USED_TEMPLATE_ID (DECL_TEMPLATE_INFO (olddecl
))
2318 = TINFO_USED_TEMPLATE_ID (new_template_info
);
2320 DECL_TEMPLATE_INFO (newdecl
) = DECL_TEMPLATE_INFO (olddecl
);
2322 /* Only functions have these fields. */
2323 if (DECL_DECLARES_FUNCTION_P (newdecl
))
2325 DECL_NONCONVERTING_P (newdecl
) = DECL_NONCONVERTING_P (olddecl
);
2326 DECL_BEFRIENDING_CLASSES (newdecl
)
2327 = chainon (DECL_BEFRIENDING_CLASSES (newdecl
),
2328 DECL_BEFRIENDING_CLASSES (olddecl
));
2329 /* DECL_THUNKS is only valid for virtual functions,
2330 otherwise it is a DECL_FRIEND_CONTEXT. */
2331 if (DECL_VIRTUAL_P (newdecl
))
2332 SET_DECL_THUNKS (newdecl
, DECL_THUNKS (olddecl
));
2334 /* Only variables have this field. */
2335 else if (VAR_P (newdecl
)
2336 && VAR_HAD_UNKNOWN_BOUND (olddecl
))
2337 SET_VAR_HAD_UNKNOWN_BOUND (newdecl
);
2340 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2344 /* Merge parameter attributes. */
2345 tree oldarg
, newarg
;
2346 for (oldarg
= DECL_ARGUMENTS(olddecl
),
2347 newarg
= DECL_ARGUMENTS(newdecl
);
2349 oldarg
= DECL_CHAIN(oldarg
), newarg
= DECL_CHAIN(newarg
)) {
2350 DECL_ATTRIBUTES (newarg
)
2351 = (*targetm
.merge_decl_attributes
) (oldarg
, newarg
);
2352 DECL_ATTRIBUTES (oldarg
) = DECL_ATTRIBUTES (newarg
);
2355 if (DECL_TEMPLATE_INSTANTIATION (olddecl
)
2356 && !DECL_TEMPLATE_INSTANTIATION (newdecl
))
2358 /* If newdecl is not a specialization, then it is not a
2359 template-related function at all. And that means that we
2360 should have exited above, returning 0. */
2361 gcc_assert (DECL_TEMPLATE_SPECIALIZATION (newdecl
));
2363 if (DECL_ODR_USED (olddecl
))
2364 /* From [temp.expl.spec]:
2366 If a template, a member template or the member of a class
2367 template is explicitly specialized then that
2368 specialization shall be declared before the first use of
2369 that specialization that would cause an implicit
2370 instantiation to take place, in every translation unit in
2371 which such a use occurs. */
2372 error ("explicit specialization of %qD after first use",
2375 SET_DECL_TEMPLATE_SPECIALIZATION (olddecl
);
2376 DECL_COMDAT (newdecl
) = (TREE_PUBLIC (newdecl
)
2377 && DECL_DECLARED_INLINE_P (newdecl
));
2379 /* Don't propagate visibility from the template to the
2380 specialization here. We'll do that in determine_visibility if
2382 DECL_VISIBILITY_SPECIFIED (olddecl
) = 0;
2384 /* [temp.expl.spec/14] We don't inline explicit specialization
2385 just because the primary template says so. */
2387 /* But still keep DECL_DISREGARD_INLINE_LIMITS in sync with
2388 the always_inline attribute. */
2389 if (DECL_DISREGARD_INLINE_LIMITS (olddecl
)
2390 && !DECL_DISREGARD_INLINE_LIMITS (newdecl
))
2392 if (DECL_DECLARED_INLINE_P (newdecl
))
2393 DECL_DISREGARD_INLINE_LIMITS (newdecl
) = true;
2395 DECL_ATTRIBUTES (newdecl
)
2396 = remove_attribute ("always_inline",
2397 DECL_ATTRIBUTES (newdecl
));
2400 else if (new_defines_function
&& DECL_INITIAL (olddecl
))
2402 /* Never inline re-defined extern inline functions.
2403 FIXME: this could be better handled by keeping both
2404 function as separate declarations. */
2405 DECL_UNINLINABLE (newdecl
) = 1;
2409 if (DECL_PENDING_INLINE_P (olddecl
))
2411 DECL_PENDING_INLINE_P (newdecl
) = 1;
2412 DECL_PENDING_INLINE_INFO (newdecl
)
2413 = DECL_PENDING_INLINE_INFO (olddecl
);
2415 else if (DECL_PENDING_INLINE_P (newdecl
))
2417 else if (DECL_SAVED_FUNCTION_DATA (newdecl
) == NULL
)
2418 DECL_SAVED_FUNCTION_DATA (newdecl
)
2419 = DECL_SAVED_FUNCTION_DATA (olddecl
);
2421 DECL_DECLARED_INLINE_P (newdecl
) |= DECL_DECLARED_INLINE_P (olddecl
);
2423 DECL_UNINLINABLE (newdecl
) = DECL_UNINLINABLE (olddecl
)
2424 = (DECL_UNINLINABLE (newdecl
) || DECL_UNINLINABLE (olddecl
));
2426 DECL_DISREGARD_INLINE_LIMITS (newdecl
)
2427 = DECL_DISREGARD_INLINE_LIMITS (olddecl
)
2428 = (DECL_DISREGARD_INLINE_LIMITS (newdecl
)
2429 || DECL_DISREGARD_INLINE_LIMITS (olddecl
));
2432 /* Preserve abstractness on cloned [cd]tors. */
2433 DECL_ABSTRACT_P (newdecl
) = DECL_ABSTRACT_P (olddecl
);
2435 /* Update newdecl's parms to point at olddecl. */
2436 for (parm
= DECL_ARGUMENTS (newdecl
); parm
;
2437 parm
= DECL_CHAIN (parm
))
2438 DECL_CONTEXT (parm
) = olddecl
;
2442 SET_DECL_LANGUAGE (olddecl
, DECL_LANGUAGE (newdecl
));
2443 COPY_DECL_ASSEMBLER_NAME (newdecl
, olddecl
);
2444 COPY_DECL_RTL (newdecl
, olddecl
);
2446 if (! types_match
|| new_defines_function
)
2448 /* These need to be copied so that the names are available.
2449 Note that if the types do match, we'll preserve inline
2450 info and other bits, but if not, we won't. */
2451 DECL_ARGUMENTS (olddecl
) = DECL_ARGUMENTS (newdecl
);
2452 DECL_RESULT (olddecl
) = DECL_RESULT (newdecl
);
2454 /* If redeclaring a builtin function, it stays built in
2455 if newdecl is a gnu_inline definition, or if newdecl is just
2457 if (DECL_BUILT_IN (olddecl
)
2458 && (new_defines_function
? GNU_INLINE_P (newdecl
) : types_match
))
2460 DECL_BUILT_IN_CLASS (newdecl
) = DECL_BUILT_IN_CLASS (olddecl
);
2461 DECL_FUNCTION_CODE (newdecl
) = DECL_FUNCTION_CODE (olddecl
);
2462 /* If we're keeping the built-in definition, keep the rtl,
2463 regardless of declaration matches. */
2464 COPY_DECL_RTL (olddecl
, newdecl
);
2465 if (DECL_BUILT_IN_CLASS (newdecl
) == BUILT_IN_NORMAL
)
2467 enum built_in_function fncode
= DECL_FUNCTION_CODE (newdecl
);
2470 /* If a compatible prototype of these builtin functions
2471 is seen, assume the runtime implements it with the
2472 expected semantics. */
2473 case BUILT_IN_STPCPY
:
2474 if (builtin_decl_explicit_p (fncode
))
2475 set_builtin_decl_implicit_p (fncode
, true);
2478 if (builtin_decl_explicit_p (fncode
))
2479 set_builtin_decl_declared_p (fncode
, true);
2484 copy_attributes_to_builtin (newdecl
);
2486 if (new_defines_function
)
2487 /* If defining a function declared with other language
2488 linkage, use the previously declared language linkage. */
2489 SET_DECL_LANGUAGE (newdecl
, DECL_LANGUAGE (olddecl
));
2490 else if (types_match
)
2492 DECL_RESULT (newdecl
) = DECL_RESULT (olddecl
);
2493 /* Don't clear out the arguments if we're just redeclaring a
2495 if (DECL_ARGUMENTS (olddecl
))
2496 DECL_ARGUMENTS (newdecl
) = DECL_ARGUMENTS (olddecl
);
2499 else if (TREE_CODE (newdecl
) == NAMESPACE_DECL
)
2500 NAMESPACE_LEVEL (newdecl
) = NAMESPACE_LEVEL (olddecl
);
2502 /* Now preserve various other info from the definition. */
2503 TREE_ADDRESSABLE (newdecl
) = TREE_ADDRESSABLE (olddecl
);
2504 TREE_ASM_WRITTEN (newdecl
) = TREE_ASM_WRITTEN (olddecl
);
2505 DECL_COMMON (newdecl
) = DECL_COMMON (olddecl
);
2506 COPY_DECL_ASSEMBLER_NAME (olddecl
, newdecl
);
2508 /* Warn about conflicting visibility specifications. */
2509 if (DECL_VISIBILITY_SPECIFIED (olddecl
)
2510 && DECL_VISIBILITY_SPECIFIED (newdecl
)
2511 && DECL_VISIBILITY (newdecl
) != DECL_VISIBILITY (olddecl
))
2513 if (warning_at (DECL_SOURCE_LOCATION (newdecl
), OPT_Wattributes
,
2514 "%qD: visibility attribute ignored because it "
2515 "conflicts with previous declaration", newdecl
))
2516 inform (DECL_SOURCE_LOCATION (olddecl
),
2517 "previous declaration of %qD", olddecl
);
2519 /* Choose the declaration which specified visibility. */
2520 if (DECL_VISIBILITY_SPECIFIED (olddecl
))
2522 DECL_VISIBILITY (newdecl
) = DECL_VISIBILITY (olddecl
);
2523 DECL_VISIBILITY_SPECIFIED (newdecl
) = 1;
2525 /* Init priority used to be merged from newdecl to olddecl by the memcpy,
2526 so keep this behavior. */
2527 if (VAR_P (newdecl
) && DECL_HAS_INIT_PRIORITY_P (newdecl
))
2529 SET_DECL_INIT_PRIORITY (olddecl
, DECL_INIT_PRIORITY (newdecl
));
2530 DECL_HAS_INIT_PRIORITY_P (olddecl
) = 1;
2532 /* Likewise for DECL_ALIGN, DECL_USER_ALIGN and DECL_PACKED. */
2533 if (DECL_ALIGN (olddecl
) > DECL_ALIGN (newdecl
))
2535 SET_DECL_ALIGN (newdecl
, DECL_ALIGN (olddecl
));
2536 DECL_USER_ALIGN (newdecl
) |= DECL_USER_ALIGN (olddecl
);
2538 DECL_USER_ALIGN (olddecl
) = DECL_USER_ALIGN (newdecl
);
2539 if (DECL_WARN_IF_NOT_ALIGN (olddecl
)
2540 > DECL_WARN_IF_NOT_ALIGN (newdecl
))
2541 SET_DECL_WARN_IF_NOT_ALIGN (newdecl
,
2542 DECL_WARN_IF_NOT_ALIGN (olddecl
));
2543 if (TREE_CODE (newdecl
) == FIELD_DECL
)
2544 DECL_PACKED (olddecl
) = DECL_PACKED (newdecl
);
2546 /* The DECL_LANG_SPECIFIC information in OLDDECL will be replaced
2547 with that from NEWDECL below. */
2548 if (DECL_LANG_SPECIFIC (olddecl
))
2550 gcc_assert (DECL_LANG_SPECIFIC (olddecl
)
2551 != DECL_LANG_SPECIFIC (newdecl
));
2552 ggc_free (DECL_LANG_SPECIFIC (olddecl
));
2555 /* Merge the USED information. */
2556 if (TREE_USED (olddecl
))
2557 TREE_USED (newdecl
) = 1;
2558 else if (TREE_USED (newdecl
))
2559 TREE_USED (olddecl
) = 1;
2560 if (VAR_P (newdecl
))
2562 if (DECL_READ_P (olddecl
))
2563 DECL_READ_P (newdecl
) = 1;
2564 else if (DECL_READ_P (newdecl
))
2565 DECL_READ_P (olddecl
) = 1;
2567 if (DECL_PRESERVE_P (olddecl
))
2568 DECL_PRESERVE_P (newdecl
) = 1;
2569 else if (DECL_PRESERVE_P (newdecl
))
2570 DECL_PRESERVE_P (olddecl
) = 1;
2572 /* Merge the DECL_FUNCTION_VERSIONED information. newdecl will be copied
2573 to olddecl and deleted. */
2574 if (TREE_CODE (newdecl
) == FUNCTION_DECL
2575 && DECL_FUNCTION_VERSIONED (olddecl
))
2577 /* Set the flag for newdecl so that it gets copied to olddecl. */
2578 DECL_FUNCTION_VERSIONED (newdecl
) = 1;
2579 /* newdecl will be purged after copying to olddecl and is no longer
2581 cgraph_node::delete_function_version_by_decl (newdecl
);
2584 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2587 struct symtab_node
*snode
= symtab_node::get (olddecl
);
2589 function_size
= sizeof (struct tree_decl_common
);
2591 memcpy ((char *) olddecl
+ sizeof (struct tree_common
),
2592 (char *) newdecl
+ sizeof (struct tree_common
),
2593 function_size
- sizeof (struct tree_common
));
2595 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
2596 (char *) newdecl
+ sizeof (struct tree_decl_common
),
2597 sizeof (struct tree_function_decl
) - sizeof (struct tree_decl_common
));
2599 /* Preserve symtab node mapping. */
2600 olddecl
->decl_with_vis
.symtab_node
= snode
;
2602 if (new_template_info
)
2603 /* If newdecl is a template instantiation, it is possible that
2604 the following sequence of events has occurred:
2606 o A friend function was declared in a class template. The
2607 class template was instantiated.
2609 o The instantiation of the friend declaration was
2610 recorded on the instantiation list, and is newdecl.
2612 o Later, however, instantiate_class_template called pushdecl
2613 on the newdecl to perform name injection. But, pushdecl in
2614 turn called duplicate_decls when it discovered that another
2615 declaration of a global function with the same name already
2618 o Here, in duplicate_decls, we decided to clobber newdecl.
2620 If we're going to do that, we'd better make sure that
2621 olddecl, and not newdecl, is on the list of
2622 instantiations so that if we try to do the instantiation
2623 again we won't get the clobbered declaration. */
2624 reregister_specialization (newdecl
,
2630 size_t size
= tree_code_size (TREE_CODE (newdecl
));
2632 memcpy ((char *) olddecl
+ sizeof (struct tree_common
),
2633 (char *) newdecl
+ sizeof (struct tree_common
),
2634 sizeof (struct tree_decl_common
) - sizeof (struct tree_common
));
2635 switch (TREE_CODE (newdecl
))
2645 struct symtab_node
*snode
= NULL
;
2648 && (TREE_STATIC (olddecl
) || TREE_PUBLIC (olddecl
)
2649 || DECL_EXTERNAL (olddecl
)))
2650 snode
= symtab_node::get (olddecl
);
2651 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
2652 (char *) newdecl
+ sizeof (struct tree_decl_common
),
2653 size
- sizeof (struct tree_decl_common
)
2654 + TREE_CODE_LENGTH (TREE_CODE (newdecl
)) * sizeof (char *));
2655 if (VAR_P (newdecl
))
2656 olddecl
->decl_with_vis
.symtab_node
= snode
;
2660 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
2661 (char *) newdecl
+ sizeof (struct tree_decl_common
),
2662 sizeof (struct tree_decl_non_common
) - sizeof (struct tree_decl_common
)
2663 + TREE_CODE_LENGTH (TREE_CODE (newdecl
)) * sizeof (char *));
2668 if (VAR_OR_FUNCTION_DECL_P (newdecl
))
2670 if (DECL_EXTERNAL (olddecl
)
2671 || TREE_PUBLIC (olddecl
)
2672 || TREE_STATIC (olddecl
))
2674 /* Merge the section attribute.
2675 We want to issue an error if the sections conflict but that must be
2676 done later in decl_attributes since we are called before attributes
2678 if (DECL_SECTION_NAME (newdecl
) != NULL
)
2679 set_decl_section_name (olddecl
, DECL_SECTION_NAME (newdecl
));
2681 if (DECL_ONE_ONLY (newdecl
))
2683 struct symtab_node
*oldsym
, *newsym
;
2684 if (TREE_CODE (olddecl
) == FUNCTION_DECL
)
2685 oldsym
= cgraph_node::get_create (olddecl
);
2687 oldsym
= varpool_node::get_create (olddecl
);
2688 newsym
= symtab_node::get (newdecl
);
2689 oldsym
->set_comdat_group (newsym
->get_comdat_group ());
2694 && CP_DECL_THREAD_LOCAL_P (newdecl
))
2696 CP_DECL_THREAD_LOCAL_P (olddecl
) = true;
2697 if (!processing_template_decl
)
2698 set_decl_tls_model (olddecl
, DECL_TLS_MODEL (newdecl
));
2702 DECL_UID (olddecl
) = olddecl_uid
;
2704 DECL_FRIEND_P (olddecl
) = 1;
2707 DECL_ANTICIPATED (olddecl
) = 1;
2708 DECL_HIDDEN_FRIEND_P (olddecl
) = 1;
2711 /* NEWDECL contains the merged attribute lists.
2712 Update OLDDECL to be the same. */
2713 DECL_ATTRIBUTES (olddecl
) = DECL_ATTRIBUTES (newdecl
);
2715 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2716 so that encode_section_info has a chance to look at the new decl
2717 flags and attributes. */
2718 if (DECL_RTL_SET_P (olddecl
)
2719 && (TREE_CODE (olddecl
) == FUNCTION_DECL
2721 && TREE_STATIC (olddecl
))))
2722 make_decl_rtl (olddecl
);
2724 /* The NEWDECL will no longer be needed. Because every out-of-class
2725 declaration of a member results in a call to duplicate_decls,
2726 freeing these nodes represents in a significant savings.
2728 Before releasing the node, be sore to remove function from symbol
2729 table that might have been inserted there to record comdat group.
2730 Be sure to however do not free DECL_STRUCT_FUNCTION because this
2731 structure is shared in between newdecl and oldecl. */
2732 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2733 DECL_STRUCT_FUNCTION (newdecl
) = NULL
;
2734 if (VAR_OR_FUNCTION_DECL_P (newdecl
))
2736 struct symtab_node
*snode
= symtab_node::get (newdecl
);
2741 /* Remove the associated constraints for newdecl, if any, before
2742 reclaiming memory. */
2744 remove_constraints (newdecl
);
2751 /* Return zero if the declaration NEWDECL is valid
2752 when the declaration OLDDECL (assumed to be for the same name)
2753 has already been seen.
2754 Otherwise return an error message format string with a %s
2755 where the identifier should go. */
2758 redeclaration_error_message (tree newdecl
, tree olddecl
)
2760 if (TREE_CODE (newdecl
) == TYPE_DECL
)
2762 /* Because C++ can put things into name space for free,
2763 constructs like "typedef struct foo { ... } foo"
2764 would look like an erroneous redeclaration. */
2765 if (same_type_p (TREE_TYPE (newdecl
), TREE_TYPE (olddecl
)))
2768 return G_("redefinition of %q#D");
2770 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2772 /* If this is a pure function, its olddecl will actually be
2773 the original initialization to `0' (which we force to call
2774 abort()). Don't complain about redefinition in this case. */
2775 if (DECL_LANG_SPECIFIC (olddecl
) && DECL_PURE_VIRTUAL_P (olddecl
)
2776 && DECL_INITIAL (olddecl
) == NULL_TREE
)
2779 /* If both functions come from different namespaces, this is not
2780 a redeclaration - this is a conflict with a used function. */
2781 if (DECL_NAMESPACE_SCOPE_P (olddecl
)
2782 && DECL_CONTEXT (olddecl
) != DECL_CONTEXT (newdecl
)
2783 && ! decls_match (olddecl
, newdecl
))
2784 return G_("%qD conflicts with used function");
2786 /* We'll complain about linkage mismatches in
2787 warn_extern_redeclared_static. */
2789 /* Defining the same name twice is no good. */
2790 if (decl_defined_p (olddecl
)
2791 && decl_defined_p (newdecl
))
2793 if (DECL_NAME (olddecl
) == NULL_TREE
)
2794 return G_("%q#D not declared in class");
2795 else if (!GNU_INLINE_P (olddecl
)
2796 || GNU_INLINE_P (newdecl
))
2797 return G_("redefinition of %q#D");
2800 if (DECL_DECLARED_INLINE_P (olddecl
) && DECL_DECLARED_INLINE_P (newdecl
))
2802 bool olda
= GNU_INLINE_P (olddecl
);
2803 bool newa
= GNU_INLINE_P (newdecl
);
2808 return G_("%q+D redeclared inline with "
2809 "%<gnu_inline%> attribute");
2811 return G_("%q+D redeclared inline without "
2812 "%<gnu_inline%> attribute");
2816 check_abi_tag_redeclaration
2817 (olddecl
, lookup_attribute ("abi_tag", DECL_ATTRIBUTES (olddecl
)),
2818 lookup_attribute ("abi_tag", DECL_ATTRIBUTES (newdecl
)));
2822 else if (TREE_CODE (newdecl
) == TEMPLATE_DECL
)
2826 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl
)) == TYPE_DECL
)
2828 if (COMPLETE_TYPE_P (TREE_TYPE (newdecl
))
2829 && COMPLETE_TYPE_P (TREE_TYPE (olddecl
)))
2830 return G_("redefinition of %q#D");
2834 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl
)) != FUNCTION_DECL
2835 || (DECL_TEMPLATE_RESULT (newdecl
)
2836 == DECL_TEMPLATE_RESULT (olddecl
)))
2839 nt
= DECL_TEMPLATE_RESULT (newdecl
);
2840 if (DECL_TEMPLATE_INFO (nt
))
2841 nt
= DECL_TEMPLATE_RESULT (template_for_substitution (nt
));
2842 ot
= DECL_TEMPLATE_RESULT (olddecl
);
2843 if (DECL_TEMPLATE_INFO (ot
))
2844 ot
= DECL_TEMPLATE_RESULT (template_for_substitution (ot
));
2845 if (DECL_INITIAL (nt
) && DECL_INITIAL (ot
)
2846 && (!GNU_INLINE_P (ot
) || GNU_INLINE_P (nt
)))
2847 return G_("redefinition of %q#D");
2849 if (DECL_DECLARED_INLINE_P (ot
) && DECL_DECLARED_INLINE_P (nt
))
2851 bool olda
= GNU_INLINE_P (ot
);
2852 bool newa
= GNU_INLINE_P (nt
);
2857 return G_("%q+D redeclared inline with "
2858 "%<gnu_inline%> attribute");
2860 return G_("%q+D redeclared inline without "
2861 "%<gnu_inline%> attribute");
2865 /* Core issue #226 (C++0x):
2867 If a friend function template declaration specifies a
2868 default template-argument, that declaration shall be a
2869 definition and shall be the only declaration of the
2870 function template in the translation unit. */
2871 if ((cxx_dialect
!= cxx98
)
2872 && TREE_CODE (ot
) == FUNCTION_DECL
&& DECL_FRIEND_P (ot
)
2873 && !check_default_tmpl_args (nt
, DECL_TEMPLATE_PARMS (newdecl
),
2874 /*is_primary=*/true,
2875 /*is_partial=*/false,
2876 /*is_friend_decl=*/2))
2877 return G_("redeclaration of friend %q#D "
2878 "may not have default template arguments");
2882 else if (VAR_P (newdecl
)
2883 && CP_DECL_THREAD_LOCAL_P (newdecl
) != CP_DECL_THREAD_LOCAL_P (olddecl
)
2884 && (! DECL_LANG_SPECIFIC (olddecl
)
2885 || ! CP_DECL_THREADPRIVATE_P (olddecl
)
2886 || CP_DECL_THREAD_LOCAL_P (newdecl
)))
2888 /* Only variables can be thread-local, and all declarations must
2889 agree on this property. */
2890 if (CP_DECL_THREAD_LOCAL_P (newdecl
))
2891 return G_("thread-local declaration of %q#D follows "
2892 "non-thread-local declaration");
2894 return G_("non-thread-local declaration of %q#D follows "
2895 "thread-local declaration");
2897 else if (toplevel_bindings_p () || DECL_NAMESPACE_SCOPE_P (newdecl
))
2899 /* The objects have been declared at namespace scope. If either
2900 is a member of an anonymous union, then this is an invalid
2901 redeclaration. For example:
2907 if ((VAR_P (newdecl
) && DECL_ANON_UNION_VAR_P (newdecl
))
2908 || (VAR_P (olddecl
) && DECL_ANON_UNION_VAR_P (olddecl
)))
2909 return G_("redeclaration of %q#D");
2910 /* If at least one declaration is a reference, there is no
2911 conflict. For example:
2917 if (DECL_EXTERNAL (newdecl
) || DECL_EXTERNAL (olddecl
))
2920 /* Static data member declared outside a class definition
2921 if the variable is defined within the class with constexpr
2922 specifier is declaration rather than definition (and
2924 if (cxx_dialect
>= cxx17
2925 && DECL_CLASS_SCOPE_P (olddecl
)
2926 && DECL_DECLARED_CONSTEXPR_P (olddecl
)
2927 && !DECL_INITIAL (newdecl
))
2929 DECL_EXTERNAL (newdecl
) = 1;
2930 /* For now, only warn with explicit -Wdeprecated. */
2931 if (global_options_set
.x_warn_deprecated
2932 && warning_at (DECL_SOURCE_LOCATION (newdecl
), OPT_Wdeprecated
,
2933 "redundant redeclaration of %<constexpr%> static "
2934 "data member %qD", newdecl
))
2935 inform (DECL_SOURCE_LOCATION (olddecl
),
2936 "previous declaration of %qD", olddecl
);
2940 /* Reject two definitions. */
2941 return G_("redefinition of %q#D");
2945 /* Objects declared with block scope: */
2946 /* Reject two definitions, and reject a definition
2947 together with an external reference. */
2948 if (!(DECL_EXTERNAL (newdecl
) && DECL_EXTERNAL (olddecl
)))
2949 return G_("redeclaration of %q#D");
2955 /* Hash and equality functions for the named_label table. */
2958 named_label_hash::hash (const value_type entry
)
2960 return IDENTIFIER_HASH_VALUE (entry
->name
);
2964 named_label_hash::equal (const value_type entry
, compare_type name
)
2966 return name
== entry
->name
;
2969 /* Look for a label named ID in the current function. If one cannot
2970 be found, create one. Return the named_label_entry, or NULL on
2973 static named_label_entry
*
2974 lookup_label_1 (tree id
, bool making_local_p
)
2976 /* You can't use labels at global scope. */
2977 if (current_function_decl
== NULL_TREE
)
2979 error ("label %qE referenced outside of any function", id
);
2984 named_labels
= hash_table
<named_label_hash
>::create_ggc (13);
2986 hashval_t hash
= IDENTIFIER_HASH_VALUE (id
);
2987 named_label_entry
**slot
2988 = named_labels
->find_slot_with_hash (id
, hash
, INSERT
);
2989 named_label_entry
*old
= *slot
;
2991 if (old
&& old
->label_decl
)
2993 if (!making_local_p
)
2996 if (old
->binding_level
== current_binding_level
)
2998 error ("local label %qE conflicts with existing label", id
);
2999 inform (DECL_SOURCE_LOCATION (old
->label_decl
), "previous label");
3004 /* We are making a new decl, create or reuse the named_label_entry */
3005 named_label_entry
*ent
= NULL
;
3006 if (old
&& !old
->label_decl
)
3010 ent
= ggc_cleared_alloc
<named_label_entry
> ();
3016 /* Now create the LABEL_DECL. */
3017 tree decl
= build_decl (input_location
, LABEL_DECL
, id
, void_type_node
);
3019 DECL_CONTEXT (decl
) = current_function_decl
;
3020 SET_DECL_MODE (decl
, VOIDmode
);
3023 C_DECLARED_LABEL_FLAG (decl
) = true;
3024 DECL_CHAIN (decl
) = current_binding_level
->names
;
3025 current_binding_level
->names
= decl
;
3028 ent
->label_decl
= decl
;
3033 /* Wrapper for lookup_label_1. */
3036 lookup_label (tree id
)
3038 bool subtime
= timevar_cond_start (TV_NAME_LOOKUP
);
3039 named_label_entry
*ent
= lookup_label_1 (id
, false);
3040 timevar_cond_stop (TV_NAME_LOOKUP
, subtime
);
3041 return ent
? ent
->label_decl
: NULL_TREE
;
3045 declare_local_label (tree id
)
3047 bool subtime
= timevar_cond_start (TV_NAME_LOOKUP
);
3048 named_label_entry
*ent
= lookup_label_1 (id
, true);
3049 timevar_cond_stop (TV_NAME_LOOKUP
, subtime
);
3050 return ent
? ent
->label_decl
: NULL_TREE
;
3053 /* Returns nonzero if it is ill-formed to jump past the declaration of
3054 DECL. Returns 2 if it's also a real problem. */
3057 decl_jump_unsafe (tree decl
)
3059 /* [stmt.dcl]/3: A program that jumps from a point where a local variable
3060 with automatic storage duration is not in scope to a point where it is
3061 in scope is ill-formed unless the variable has scalar type, class type
3062 with a trivial default constructor and a trivial destructor, a
3063 cv-qualified version of one of these types, or an array of one of the
3064 preceding types and is declared without an initializer (8.5). */
3065 tree type
= TREE_TYPE (decl
);
3067 if (!VAR_P (decl
) || TREE_STATIC (decl
)
3068 || type
== error_mark_node
)
3071 if (DECL_NONTRIVIALLY_INITIALIZED_P (decl
)
3072 || variably_modified_type_p (type
, NULL_TREE
))
3075 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type
))
3081 /* A subroutine of check_previous_goto_1 and check_goto to identify a branch
3085 identify_goto (tree decl
, location_t loc
, const location_t
*locus
,
3086 diagnostic_t diag_kind
)
3089 = emit_diagnostic (diag_kind
, loc
, 0,
3090 decl
? N_("jump to label %qD")
3091 : N_("jump to case label"), decl
);
3092 if (complained
&& locus
)
3093 inform (*locus
, " from here");
3097 /* Check that a single previously seen jump to a newly defined label
3098 is OK. DECL is the LABEL_DECL or 0; LEVEL is the binding_level for
3099 the jump context; NAMES are the names in scope in LEVEL at the jump
3100 context; LOCUS is the source position of the jump or 0. Returns
3101 true if all is well. */
3104 check_previous_goto_1 (tree decl
, cp_binding_level
* level
, tree names
,
3105 bool exited_omp
, const location_t
*locus
)
3107 cp_binding_level
*b
;
3108 bool complained
= false;
3110 bool saw_eh
= false, saw_omp
= false, saw_tm
= false, saw_cxif
= false;
3114 complained
= identify_goto (decl
, input_location
, locus
, DK_ERROR
);
3116 inform (input_location
, " exits OpenMP structured block");
3121 for (b
= current_binding_level
; b
; b
= b
->level_chain
)
3123 tree new_decls
, old_decls
= (b
== level
? names
: NULL_TREE
);
3125 for (new_decls
= b
->names
; new_decls
!= old_decls
;
3126 new_decls
= (DECL_P (new_decls
) ? DECL_CHAIN (new_decls
)
3127 : TREE_CHAIN (new_decls
)))
3129 int problem
= decl_jump_unsafe (new_decls
);
3135 complained
= identify_goto (decl
, input_location
, locus
,
3142 inform (DECL_SOURCE_LOCATION (new_decls
),
3143 " crosses initialization of %q#D", new_decls
);
3145 inform (DECL_SOURCE_LOCATION (new_decls
),
3146 " enters scope of %q#D, which has "
3147 "non-trivial destructor", new_decls
);
3154 const char *inf
= NULL
;
3155 location_t loc
= input_location
;
3160 inf
= N_("enters try block");
3166 inf
= N_("enters catch block");
3172 inf
= N_("enters OpenMP structured block");
3176 case sk_transaction
:
3178 inf
= N_("enters synchronized or atomic statement");
3183 if (!saw_cxif
&& level_for_constexpr_if (b
->level_chain
))
3185 inf
= N_("enters constexpr if statement");
3186 loc
= EXPR_LOCATION (b
->level_chain
->this_entity
);
3198 complained
= identify_goto (decl
, input_location
, locus
, DK_ERROR
);
3201 inform (loc
, " %s", inf
);
3209 check_previous_goto (tree decl
, struct named_label_use_entry
*use
)
3211 check_previous_goto_1 (decl
, use
->binding_level
,
3212 use
->names_in_scope
, use
->in_omp_scope
,
3213 &use
->o_goto_locus
);
3217 check_switch_goto (cp_binding_level
* level
)
3219 return check_previous_goto_1 (NULL_TREE
, level
, level
->names
, false, NULL
);
3222 /* Check that a new jump to a label DECL is OK. Called by
3223 finish_goto_stmt. */
3226 check_goto (tree decl
)
3228 /* We can't know where a computed goto is jumping.
3229 So we assume that it's OK. */
3230 if (TREE_CODE (decl
) != LABEL_DECL
)
3233 /* We didn't record any information about this label when we created it,
3234 and there's not much point since it's trivial to analyze as a return. */
3235 if (decl
== cdtor_label
)
3238 hashval_t hash
= IDENTIFIER_HASH_VALUE (DECL_NAME (decl
));
3239 named_label_entry
**slot
3240 = named_labels
->find_slot_with_hash (DECL_NAME (decl
), hash
, NO_INSERT
);
3241 named_label_entry
*ent
= *slot
;
3243 /* If the label hasn't been defined yet, defer checking. */
3244 if (! DECL_INITIAL (decl
))
3246 /* Don't bother creating another use if the last goto had the
3247 same data, and will therefore create the same set of errors. */
3249 && ent
->uses
->names_in_scope
== current_binding_level
->names
)
3252 named_label_use_entry
*new_use
3253 = ggc_alloc
<named_label_use_entry
> ();
3254 new_use
->binding_level
= current_binding_level
;
3255 new_use
->names_in_scope
= current_binding_level
->names
;
3256 new_use
->o_goto_locus
= input_location
;
3257 new_use
->in_omp_scope
= false;
3259 new_use
->next
= ent
->uses
;
3260 ent
->uses
= new_use
;
3264 bool saw_catch
= false, complained
= false;
3269 if (ent
->in_try_scope
|| ent
->in_catch_scope
|| ent
->in_transaction_scope
3270 || ent
->in_constexpr_if
3271 || ent
->in_omp_scope
|| !vec_safe_is_empty (ent
->bad_decls
))
3273 diagnostic_t diag_kind
= DK_PERMERROR
;
3274 if (ent
->in_try_scope
|| ent
->in_catch_scope
|| ent
->in_constexpr_if
3275 || ent
->in_transaction_scope
|| ent
->in_omp_scope
)
3276 diag_kind
= DK_ERROR
;
3277 complained
= identify_goto (decl
, DECL_SOURCE_LOCATION (decl
),
3278 &input_location
, diag_kind
);
3279 identified
= 1 + (diag_kind
== DK_ERROR
);
3282 FOR_EACH_VEC_SAFE_ELT (ent
->bad_decls
, ix
, bad
)
3284 int u
= decl_jump_unsafe (bad
);
3286 if (u
> 1 && DECL_ARTIFICIAL (bad
))
3288 /* Can't skip init of __exception_info. */
3289 if (identified
== 1)
3291 complained
= identify_goto (decl
, DECL_SOURCE_LOCATION (decl
),
3292 &input_location
, DK_ERROR
);
3296 inform (DECL_SOURCE_LOCATION (bad
), " enters catch block");
3299 else if (complained
)
3302 inform (DECL_SOURCE_LOCATION (bad
),
3303 " skips initialization of %q#D", bad
);
3305 inform (DECL_SOURCE_LOCATION (bad
),
3306 " enters scope of %q#D which has "
3307 "non-trivial destructor", bad
);
3313 if (ent
->in_try_scope
)
3314 inform (input_location
, " enters try block");
3315 else if (ent
->in_catch_scope
&& !saw_catch
)
3316 inform (input_location
, " enters catch block");
3317 else if (ent
->in_transaction_scope
)
3318 inform (input_location
, " enters synchronized or atomic statement");
3319 else if (ent
->in_constexpr_if
)
3320 inform (input_location
, " enters constexpr if statement");
3323 if (ent
->in_omp_scope
)
3326 inform (input_location
, " enters OpenMP structured block");
3328 else if (flag_openmp
)
3329 for (cp_binding_level
*b
= current_binding_level
; b
; b
= b
->level_chain
)
3331 if (b
== ent
->binding_level
)
3333 if (b
->kind
== sk_omp
)
3337 complained
= identify_goto (decl
,
3338 DECL_SOURCE_LOCATION (decl
),
3339 &input_location
, DK_ERROR
);
3343 inform (input_location
, " exits OpenMP structured block");
3349 /* Check that a return is ok wrt OpenMP structured blocks.
3350 Called by finish_return_stmt. Returns true if all is well. */
3353 check_omp_return (void)
3355 for (cp_binding_level
*b
= current_binding_level
; b
; b
= b
->level_chain
)
3356 if (b
->kind
== sk_omp
)
3358 error ("invalid exit from OpenMP structured block");
3361 else if (b
->kind
== sk_function_parms
)
3366 /* Define a label, specifying the location in the source file.
3367 Return the LABEL_DECL node for the label. */
3370 define_label_1 (location_t location
, tree name
)
3372 /* After labels, make any new cleanups in the function go into their
3373 own new (temporary) binding contour. */
3374 for (cp_binding_level
*p
= current_binding_level
;
3375 p
->kind
!= sk_function_parms
;
3377 p
->more_cleanups_ok
= 0;
3379 named_label_entry
*ent
= lookup_label_1 (name
, false);
3380 tree decl
= ent
->label_decl
;
3382 if (DECL_INITIAL (decl
) != NULL_TREE
)
3384 error ("duplicate label %qD", decl
);
3385 return error_mark_node
;
3389 /* Mark label as having been defined. */
3390 DECL_INITIAL (decl
) = error_mark_node
;
3391 /* Say where in the source. */
3392 DECL_SOURCE_LOCATION (decl
) = location
;
3394 ent
->binding_level
= current_binding_level
;
3395 ent
->names_in_scope
= current_binding_level
->names
;
3397 for (named_label_use_entry
*use
= ent
->uses
; use
; use
= use
->next
)
3398 check_previous_goto (decl
, use
);
3405 /* Wrapper for define_label_1. */
3408 define_label (location_t location
, tree name
)
3410 bool running
= timevar_cond_start (TV_NAME_LOOKUP
);
3411 tree ret
= define_label_1 (location
, name
);
3412 timevar_cond_stop (TV_NAME_LOOKUP
, running
);
3419 cp_binding_level
*level
;
3420 struct cp_switch
*next
;
3421 /* The SWITCH_STMT being built. */
3423 /* A splay-tree mapping the low element of a case range to the high
3424 element, or NULL_TREE if there is no high element. Used to
3425 determine whether or not a new case label duplicates an old case
3426 label. We need a tree, rather than simply a hash table, because
3427 of the GNU case range extension. */
3429 /* Remember whether there was a case value that is outside the
3430 range of the original type of the controlling expression. */
3431 bool outside_range_p
;
3434 /* A stack of the currently active switch statements. The innermost
3435 switch statement is on the top of the stack. There is no need to
3436 mark the stack for garbage collection because it is only active
3437 during the processing of the body of a function, and we never
3438 collect at that point. */
3440 static struct cp_switch
*switch_stack
;
3442 /* Called right after a switch-statement condition is parsed.
3443 SWITCH_STMT is the switch statement being parsed. */
3446 push_switch (tree switch_stmt
)
3448 struct cp_switch
*p
= XNEW (struct cp_switch
);
3449 p
->level
= current_binding_level
;
3450 p
->next
= switch_stack
;
3451 p
->switch_stmt
= switch_stmt
;
3452 p
->cases
= splay_tree_new (case_compare
, NULL
, NULL
);
3453 p
->outside_range_p
= false;
3460 struct cp_switch
*cs
= switch_stack
;
3461 location_t switch_location
;
3463 /* Emit warnings as needed. */
3464 switch_location
= EXPR_LOC_OR_LOC (cs
->switch_stmt
, input_location
);
3465 const bool bool_cond_p
3466 = (SWITCH_STMT_TYPE (cs
->switch_stmt
)
3467 && TREE_CODE (SWITCH_STMT_TYPE (cs
->switch_stmt
)) == BOOLEAN_TYPE
);
3468 if (!processing_template_decl
)
3469 c_do_switch_warnings (cs
->cases
, switch_location
,
3470 SWITCH_STMT_TYPE (cs
->switch_stmt
),
3471 SWITCH_STMT_COND (cs
->switch_stmt
),
3472 bool_cond_p
, cs
->outside_range_p
);
3474 splay_tree_delete (cs
->cases
);
3475 switch_stack
= switch_stack
->next
;
3479 /* Convert a case constant VALUE in a switch to the type TYPE of the switch
3480 condition. Note that if TYPE and VALUE are already integral we don't
3481 really do the conversion because the language-independent
3482 warning/optimization code will work better that way. */
3485 case_conversion (tree type
, tree value
)
3487 if (value
== NULL_TREE
)
3490 if (cxx_dialect
>= cxx11
3491 && (SCOPED_ENUM_P (type
)
3492 || !INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (value
))))
3494 if (INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type
))
3495 type
= type_promotes_to (type
);
3496 value
= (perform_implicit_conversion_flags
3497 (type
, value
, tf_warning_or_error
,
3498 LOOKUP_IMPLICIT
| LOOKUP_NO_NON_INTEGRAL
));
3500 return cxx_constant_value (value
);
3503 /* Note that we've seen a definition of a case label, and complain if this
3504 is a bad place for one. */
3507 finish_case_label (location_t loc
, tree low_value
, tree high_value
)
3510 cp_binding_level
*p
;
3513 if (processing_template_decl
)
3517 /* For templates, just add the case label; we'll do semantic
3518 analysis at instantiation-time. */
3519 label
= build_decl (loc
, LABEL_DECL
, NULL_TREE
, NULL_TREE
);
3520 return add_stmt (build_case_label (low_value
, high_value
, label
));
3523 /* Find the condition on which this switch statement depends. */
3524 cond
= SWITCH_STMT_COND (switch_stack
->switch_stmt
);
3525 if (cond
&& TREE_CODE (cond
) == TREE_LIST
)
3526 cond
= TREE_VALUE (cond
);
3528 if (!check_switch_goto (switch_stack
->level
))
3529 return error_mark_node
;
3531 type
= SWITCH_STMT_TYPE (switch_stack
->switch_stmt
);
3533 low_value
= case_conversion (type
, low_value
);
3534 high_value
= case_conversion (type
, high_value
);
3536 r
= c_add_case_label (loc
, switch_stack
->cases
, cond
, type
,
3537 low_value
, high_value
,
3538 &switch_stack
->outside_range_p
);
3540 /* After labels, make any new cleanups in the function go into their
3541 own new (temporary) binding contour. */
3542 for (p
= current_binding_level
;
3543 p
->kind
!= sk_function_parms
;
3545 p
->more_cleanups_ok
= 0;
3550 struct typename_info
{
3558 struct typename_hasher
: ggc_ptr_hash
<tree_node
>
3560 typedef typename_info
*compare_type
;
3562 /* Hash a TYPENAME_TYPE. */
3569 hash
= (htab_hash_pointer (TYPE_CONTEXT (t
))
3570 ^ htab_hash_pointer (TYPE_IDENTIFIER (t
)));
3575 /* Compare two TYPENAME_TYPEs. */
3578 equal (tree t1
, const typename_info
*t2
)
3580 return (TYPE_IDENTIFIER (t1
) == t2
->name
3581 && TYPE_CONTEXT (t1
) == t2
->scope
3582 && TYPENAME_TYPE_FULLNAME (t1
) == t2
->template_id
3583 && TYPENAME_IS_ENUM_P (t1
) == t2
->enum_p
3584 && TYPENAME_IS_CLASS_P (t1
) == t2
->class_p
);
3588 /* Build a TYPENAME_TYPE. If the type is `typename T::t', CONTEXT is
3589 the type of `T', NAME is the IDENTIFIER_NODE for `t'.
3591 Returns the new TYPENAME_TYPE. */
3593 static GTY (()) hash_table
<typename_hasher
> *typename_htab
;
3596 build_typename_type (tree context
, tree name
, tree fullname
,
3597 enum tag_types tag_type
)
3605 if (typename_htab
== NULL
)
3606 typename_htab
= hash_table
<typename_hasher
>::create_ggc (61);
3608 ti
.scope
= FROB_CONTEXT (context
);
3610 ti
.template_id
= fullname
;
3611 ti
.enum_p
= tag_type
== enum_type
;
3612 ti
.class_p
= (tag_type
== class_type
3613 || tag_type
== record_type
3614 || tag_type
== union_type
);
3615 hash
= (htab_hash_pointer (ti
.scope
)
3616 ^ htab_hash_pointer (ti
.name
));
3618 /* See if we already have this type. */
3619 e
= typename_htab
->find_slot_with_hash (&ti
, hash
, INSERT
);
3624 /* Build the TYPENAME_TYPE. */
3625 t
= cxx_make_type (TYPENAME_TYPE
);
3626 TYPE_CONTEXT (t
) = ti
.scope
;
3627 TYPENAME_TYPE_FULLNAME (t
) = ti
.template_id
;
3628 TYPENAME_IS_ENUM_P (t
) = ti
.enum_p
;
3629 TYPENAME_IS_CLASS_P (t
) = ti
.class_p
;
3631 /* Build the corresponding TYPE_DECL. */
3632 d
= build_decl (input_location
, TYPE_DECL
, name
, t
);
3633 TYPE_NAME (TREE_TYPE (d
)) = d
;
3634 TYPE_STUB_DECL (TREE_TYPE (d
)) = d
;
3635 DECL_CONTEXT (d
) = FROB_CONTEXT (context
);
3636 DECL_ARTIFICIAL (d
) = 1;
3638 /* Store it in the hash table. */
3641 /* TYPENAME_TYPEs must always be compared structurally, because
3642 they may or may not resolve down to another type depending on
3643 the currently open classes. */
3644 SET_TYPE_STRUCTURAL_EQUALITY (t
);
3650 /* Resolve `typename CONTEXT::NAME'. TAG_TYPE indicates the tag
3651 provided to name the type. Returns an appropriate type, unless an
3652 error occurs, in which case error_mark_node is returned. If we
3653 locate a non-artificial TYPE_DECL and TF_KEEP_TYPE_DECL is set, we
3654 return that, rather than the _TYPE it corresponds to, in other
3655 cases we look through the type decl. If TF_ERROR is set, complain
3656 about errors, otherwise be quiet. */
3659 make_typename_type (tree context
, tree name
, enum tag_types tag_type
,
3660 tsubst_flags_t complain
)
3666 if (name
== error_mark_node
3667 || context
== NULL_TREE
3668 || context
== error_mark_node
)
3669 return error_mark_node
;
3673 if (!(TYPE_LANG_SPECIFIC (name
)
3674 && (CLASSTYPE_IS_TEMPLATE (name
)
3675 || CLASSTYPE_USE_TEMPLATE (name
))))
3676 name
= TYPE_IDENTIFIER (name
);
3678 /* Create a TEMPLATE_ID_EXPR for the type. */
3679 name
= build_nt (TEMPLATE_ID_EXPR
,
3680 CLASSTYPE_TI_TEMPLATE (name
),
3681 CLASSTYPE_TI_ARGS (name
));
3683 else if (TREE_CODE (name
) == TYPE_DECL
)
3684 name
= DECL_NAME (name
);
3688 if (TREE_CODE (name
) == TEMPLATE_ID_EXPR
)
3690 name
= TREE_OPERAND (name
, 0);
3691 if (DECL_TYPE_TEMPLATE_P (name
))
3692 name
= TREE_OPERAND (fullname
, 0) = DECL_NAME (name
);
3693 if (TREE_CODE (name
) != IDENTIFIER_NODE
)
3695 if (complain
& tf_error
)
3696 error ("%qD is not a type", name
);
3697 return error_mark_node
;
3700 if (TREE_CODE (name
) == TEMPLATE_DECL
)
3702 if (complain
& tf_error
)
3703 error ("%qD used without template parameters", name
);
3704 return error_mark_node
;
3706 gcc_assert (identifier_p (name
));
3707 gcc_assert (TYPE_P (context
));
3709 if (!MAYBE_CLASS_TYPE_P (context
))
3711 if (complain
& tf_error
)
3712 error ("%q#T is not a class", context
);
3713 return error_mark_node
;
3716 /* When the CONTEXT is a dependent type, NAME could refer to a
3717 dependent base class of CONTEXT. But look inside it anyway
3718 if CONTEXT is a currently open scope, in case it refers to a
3719 member of the current instantiation or a non-dependent base;
3720 lookup will stop when we hit a dependent base. */
3721 if (!dependent_scope_p (context
))
3722 /* We should only set WANT_TYPE when we're a nested typename type.
3723 Then we can give better diagnostics if we find a non-type. */
3724 t
= lookup_field (context
, name
, 2, /*want_type=*/true);
3728 if ((!t
|| TREE_CODE (t
) == TREE_LIST
) && dependent_type_p (context
))
3729 return build_typename_type (context
, name
, fullname
, tag_type
);
3731 want_template
= TREE_CODE (fullname
) == TEMPLATE_ID_EXPR
;
3735 if (complain
& tf_error
)
3737 if (!COMPLETE_TYPE_P (context
))
3738 cxx_incomplete_type_error (NULL_TREE
, context
);
3740 error (want_template
? G_("no class template named %q#T in %q#T")
3741 : G_("no type named %q#T in %q#T"), name
, context
);
3743 return error_mark_node
;
3746 /* Pull out the template from an injected-class-name (or multiple). */
3748 t
= maybe_get_template_decl_from_type_decl (t
);
3750 if (TREE_CODE (t
) == TREE_LIST
)
3752 if (complain
& tf_error
)
3754 error ("lookup of %qT in %qT is ambiguous", name
, context
);
3755 print_candidates (t
);
3757 return error_mark_node
;
3760 if (want_template
&& !DECL_TYPE_TEMPLATE_P (t
))
3762 if (complain
& tf_error
)
3763 error ("%<typename %T::%D%> names %q#T, which is not a class template",
3765 return error_mark_node
;
3767 if (!want_template
&& TREE_CODE (t
) != TYPE_DECL
)
3769 if (complain
& tf_error
)
3770 error ("%<typename %T::%D%> names %q#T, which is not a type",
3772 return error_mark_node
;
3775 if (!perform_or_defer_access_check (TYPE_BINFO (context
), t
, t
, complain
))
3776 return error_mark_node
;
3778 /* If we are currently parsing a template and if T is a typedef accessed
3779 through CONTEXT then we need to remember and check access of T at
3780 template instantiation time. */
3781 add_typedef_to_current_template_for_access_check (t
, context
, input_location
);
3784 return lookup_template_class (t
, TREE_OPERAND (fullname
, 1),
3786 /*entering_scope=*/0,
3787 complain
| tf_user
);
3789 if (DECL_ARTIFICIAL (t
) || !(complain
& tf_keep_type_decl
))
3792 maybe_record_typedef_use (t
);
3797 /* Resolve `CONTEXT::template NAME'. Returns a TEMPLATE_DECL if the name
3798 can be resolved or an UNBOUND_CLASS_TEMPLATE, unless an error occurs,
3799 in which case error_mark_node is returned.
3801 If PARM_LIST is non-NULL, also make sure that the template parameter
3802 list of TEMPLATE_DECL matches.
3804 If COMPLAIN zero, don't complain about any errors that occur. */
3807 make_unbound_class_template (tree context
, tree name
, tree parm_list
,
3808 tsubst_flags_t complain
)
3814 name
= TYPE_IDENTIFIER (name
);
3815 else if (DECL_P (name
))
3816 name
= DECL_NAME (name
);
3817 gcc_assert (identifier_p (name
));
3819 if (!dependent_type_p (context
)
3820 || currently_open_class (context
))
3822 tree tmpl
= NULL_TREE
;
3824 if (MAYBE_CLASS_TYPE_P (context
))
3825 tmpl
= lookup_field (context
, name
, 0, false);
3827 if (tmpl
&& TREE_CODE (tmpl
) == TYPE_DECL
)
3828 tmpl
= maybe_get_template_decl_from_type_decl (tmpl
);
3830 if (!tmpl
|| !DECL_TYPE_TEMPLATE_P (tmpl
))
3832 if (complain
& tf_error
)
3833 error ("no class template named %q#T in %q#T", name
, context
);
3834 return error_mark_node
;
3838 && !comp_template_parms (DECL_TEMPLATE_PARMS (tmpl
), parm_list
))
3840 if (complain
& tf_error
)
3842 error ("template parameters do not match template %qD", tmpl
);
3843 inform (DECL_SOURCE_LOCATION (tmpl
),
3844 "%qD declared here", tmpl
);
3846 return error_mark_node
;
3849 if (!perform_or_defer_access_check (TYPE_BINFO (context
), tmpl
, tmpl
,
3851 return error_mark_node
;
3856 /* Build the UNBOUND_CLASS_TEMPLATE. */
3857 t
= cxx_make_type (UNBOUND_CLASS_TEMPLATE
);
3858 TYPE_CONTEXT (t
) = FROB_CONTEXT (context
);
3859 TREE_TYPE (t
) = NULL_TREE
;
3860 SET_TYPE_STRUCTURAL_EQUALITY (t
);
3862 /* Build the corresponding TEMPLATE_DECL. */
3863 d
= build_decl (input_location
, TEMPLATE_DECL
, name
, t
);
3864 TYPE_NAME (TREE_TYPE (d
)) = d
;
3865 TYPE_STUB_DECL (TREE_TYPE (d
)) = d
;
3866 DECL_CONTEXT (d
) = FROB_CONTEXT (context
);
3867 DECL_ARTIFICIAL (d
) = 1;
3868 DECL_TEMPLATE_PARMS (d
) = parm_list
;
3875 /* Push the declarations of builtin types into the global namespace.
3876 RID_INDEX is the index of the builtin type in the array
3877 RID_POINTERS. NAME is the name used when looking up the builtin
3878 type. TYPE is the _TYPE node for the builtin type.
3880 The calls to set_global_binding below should be
3881 eliminated. Built-in types should not be looked up name; their
3882 names are keywords that the parser can recognize. However, there
3883 is code in c-common.c that uses identifier_global_value to look up
3884 built-in types by name. */
3887 record_builtin_type (enum rid rid_index
,
3891 tree decl
= NULL_TREE
;
3895 tree tname
= get_identifier (name
);
3896 tree tdecl
= build_decl (BUILTINS_LOCATION
, TYPE_DECL
, tname
, type
);
3897 DECL_ARTIFICIAL (tdecl
) = 1;
3898 set_global_binding (tdecl
);
3902 if ((int) rid_index
< (int) RID_MAX
)
3903 if (tree rname
= ridpointers
[(int) rid_index
])
3904 if (!decl
|| DECL_NAME (decl
) != rname
)
3906 tree rdecl
= build_decl (BUILTINS_LOCATION
, TYPE_DECL
, rname
, type
);
3907 DECL_ARTIFICIAL (rdecl
) = 1;
3908 set_global_binding (rdecl
);
3915 if (!TYPE_NAME (type
))
3916 TYPE_NAME (type
) = decl
;
3917 debug_hooks
->type_decl (decl
, 0);
3921 /* Push a type into the namespace so that the back ends ignore it. */
3924 record_unknown_type (tree type
, const char* name
)
3926 tree decl
= pushdecl (build_decl (UNKNOWN_LOCATION
,
3927 TYPE_DECL
, get_identifier (name
), type
));
3928 /* Make sure the "unknown type" typedecl gets ignored for debug info. */
3929 DECL_IGNORED_P (decl
) = 1;
3930 TYPE_DECL_SUPPRESS_DEBUG (decl
) = 1;
3931 TYPE_SIZE (type
) = TYPE_SIZE (void_type_node
);
3932 SET_TYPE_ALIGN (type
, 1);
3933 TYPE_USER_ALIGN (type
) = 0;
3934 SET_TYPE_MODE (type
, TYPE_MODE (void_type_node
));
3937 /* Create all the predefined identifiers. */
3940 initialize_predefined_identifiers (void)
3942 struct predefined_identifier
3944 const char *name
; /* Name. */
3945 tree
*node
; /* Node to store it in. */
3946 cp_identifier_kind kind
; /* Kind of identifier. */
3949 /* A table of identifiers to create at startup. */
3950 static const predefined_identifier predefined_identifiers
[] = {
3951 {"C++", &lang_name_cplusplus
, cik_normal
},
3952 {"C", &lang_name_c
, cik_normal
},
3953 /* Some of these names have a trailing space so that it is
3954 impossible for them to conflict with names written by users. */
3955 {"__ct ", &ctor_identifier
, cik_ctor
},
3956 {"__ct_base ", &base_ctor_identifier
, cik_ctor
},
3957 {"__ct_comp ", &complete_ctor_identifier
, cik_ctor
},
3958 {"__dt ", &dtor_identifier
, cik_dtor
},
3959 {"__dt_base ", &base_dtor_identifier
, cik_dtor
},
3960 {"__dt_comp ", &complete_dtor_identifier
, cik_dtor
},
3961 {"__dt_del ", &deleting_dtor_identifier
, cik_dtor
},
3962 {"__conv_op ", &conv_op_identifier
, cik_conv_op
},
3963 {"__in_chrg", &in_charge_identifier
, cik_normal
},
3964 {"this", &this_identifier
, cik_normal
},
3965 {"__delta", &delta_identifier
, cik_normal
},
3966 {"__pfn", &pfn_identifier
, cik_normal
},
3967 {"_vptr", &vptr_identifier
, cik_normal
},
3968 {"__vtt_parm", &vtt_parm_identifier
, cik_normal
},
3969 {"::", &global_identifier
, cik_normal
},
3970 {"std", &std_identifier
, cik_normal
},
3971 /* The demangler expects anonymous namespaces to be called
3972 something starting with '_GLOBAL__N_'. It no longer needs
3973 to be unique to the TU. */
3974 {"_GLOBAL__N_1", &anon_identifier
, cik_normal
},
3975 {"auto", &auto_identifier
, cik_normal
},
3976 {"decltype(auto)", &decltype_auto_identifier
, cik_normal
},
3977 {"initializer_list", &init_list_identifier
, cik_normal
},
3978 {NULL
, NULL
, cik_normal
}
3981 for (const predefined_identifier
*pid
= predefined_identifiers
;
3984 *pid
->node
= get_identifier (pid
->name
);
3985 /* Some of these identifiers already have a special kind. */
3986 if (pid
->kind
!= cik_normal
)
3987 set_identifier_kind (*pid
->node
, pid
->kind
);
3991 /* Create the predefined scalar types of C,
3992 and some nodes representing standard constants (0, 1, (void *)0).
3993 Initialize the global binding level.
3994 Make definitions for built-in primitive functions. */
3997 cxx_init_decl_processing (void)
4000 tree void_ftype_ptr
;
4002 /* Create all the identifiers we need. */
4003 initialize_predefined_identifiers ();
4005 /* Create the global variables. */
4006 push_to_top_level ();
4008 current_function_decl
= NULL_TREE
;
4009 current_binding_level
= NULL
;
4010 /* Enter the global namespace. */
4011 gcc_assert (global_namespace
== NULL_TREE
);
4012 global_namespace
= build_lang_decl (NAMESPACE_DECL
, global_identifier
,
4014 TREE_PUBLIC (global_namespace
) = 1;
4015 DECL_CONTEXT (global_namespace
)
4016 = build_translation_unit_decl (get_identifier (main_input_filename
));
4017 debug_hooks
->register_main_translation_unit
4018 (DECL_CONTEXT (global_namespace
));
4019 begin_scope (sk_namespace
, global_namespace
);
4020 current_namespace
= global_namespace
;
4022 if (flag_visibility_ms_compat
)
4023 default_visibility
= VISIBILITY_HIDDEN
;
4026 current_lang_name
= lang_name_c
;
4028 /* Create the `std' namespace. */
4029 push_namespace (std_identifier
);
4030 std_node
= current_namespace
;
4033 flag_noexcept_type
= (cxx_dialect
>= cxx17
);
4035 c_common_nodes_and_builtins ();
4037 integer_two_node
= build_int_cst (NULL_TREE
, 2);
4039 /* Guess at the initial static decls size. */
4040 vec_alloc (static_decls
, 500);
4042 /* ... and keyed classes. */
4043 vec_alloc (keyed_classes
, 100);
4045 record_builtin_type (RID_BOOL
, "bool", boolean_type_node
);
4046 truthvalue_type_node
= boolean_type_node
;
4047 truthvalue_false_node
= boolean_false_node
;
4048 truthvalue_true_node
= boolean_true_node
;
4050 empty_except_spec
= build_tree_list (NULL_TREE
, NULL_TREE
);
4051 noexcept_true_spec
= build_tree_list (boolean_true_node
, NULL_TREE
);
4052 noexcept_false_spec
= build_tree_list (boolean_false_node
, NULL_TREE
);
4053 noexcept_deferred_spec
= build_tree_list (make_node (DEFERRED_NOEXCEPT
),
4057 record_builtin_type (RID_MAX
, NULL
, string_type_node
);
4060 delta_type_node
= ptrdiff_type_node
;
4061 vtable_index_type
= ptrdiff_type_node
;
4063 vtt_parm_type
= build_pointer_type (const_ptr_type_node
);
4064 void_ftype
= build_function_type_list (void_type_node
, NULL_TREE
);
4065 void_ftype_ptr
= build_function_type_list (void_type_node
,
4066 ptr_type_node
, NULL_TREE
);
4068 = build_exception_variant (void_ftype_ptr
, empty_except_spec
);
4070 /* Create the conversion operator marker. This operator's DECL_NAME
4071 is in the identifier table, so we can use identifier equality to
4073 conv_op_marker
= build_lang_decl (FUNCTION_DECL
, conv_op_identifier
,
4076 /* C++ extensions */
4078 unknown_type_node
= make_node (LANG_TYPE
);
4079 record_unknown_type (unknown_type_node
, "unknown type");
4081 /* Indirecting an UNKNOWN_TYPE node yields an UNKNOWN_TYPE node. */
4082 TREE_TYPE (unknown_type_node
) = unknown_type_node
;
4084 /* Looking up TYPE_POINTER_TO and TYPE_REFERENCE_TO yield the same
4086 TYPE_POINTER_TO (unknown_type_node
) = unknown_type_node
;
4087 TYPE_REFERENCE_TO (unknown_type_node
) = unknown_type_node
;
4089 init_list_type_node
= make_node (LANG_TYPE
);
4090 record_unknown_type (init_list_type_node
, "init list");
4093 /* Make sure we get a unique function type, so we can give
4094 its pointer type a name. (This wins for gdb.) */
4095 tree vfunc_type
= make_node (FUNCTION_TYPE
);
4096 TREE_TYPE (vfunc_type
) = integer_type_node
;
4097 TYPE_ARG_TYPES (vfunc_type
) = NULL_TREE
;
4098 layout_type (vfunc_type
);
4100 vtable_entry_type
= build_pointer_type (vfunc_type
);
4102 record_builtin_type (RID_MAX
, "__vtbl_ptr_type", vtable_entry_type
);
4105 = build_cplus_array_type (vtable_entry_type
, NULL_TREE
);
4106 layout_type (vtbl_type_node
);
4107 vtbl_type_node
= cp_build_qualified_type (vtbl_type_node
, TYPE_QUAL_CONST
);
4108 record_builtin_type (RID_MAX
, NULL
, vtbl_type_node
);
4109 vtbl_ptr_type_node
= build_pointer_type (vtable_entry_type
);
4110 layout_type (vtbl_ptr_type_node
);
4111 record_builtin_type (RID_MAX
, NULL
, vtbl_ptr_type_node
);
4113 push_namespace (get_identifier ("__cxxabiv1"));
4114 abi_node
= current_namespace
;
4117 global_type_node
= make_node (LANG_TYPE
);
4118 record_unknown_type (global_type_node
, "global type");
4120 any_targ_node
= make_node (LANG_TYPE
);
4121 record_unknown_type (any_targ_node
, "any type");
4124 current_lang_name
= lang_name_cplusplus
;
4126 if (aligned_new_threshold
> 1
4127 && !pow2p_hwi (aligned_new_threshold
))
4129 error ("-faligned-new=%d is not a power of two", aligned_new_threshold
);
4130 aligned_new_threshold
= 1;
4132 if (aligned_new_threshold
== -1)
4133 aligned_new_threshold
= (cxx_dialect
>= cxx17
) ? 1 : 0;
4134 if (aligned_new_threshold
== 1)
4135 aligned_new_threshold
= malloc_alignment () / BITS_PER_UNIT
;
4138 tree newattrs
, extvisattr
;
4139 tree newtype
, deltype
;
4140 tree ptr_ftype_sizetype
;
4144 = build_function_type_list (ptr_type_node
, size_type_node
, NULL_TREE
);
4145 if (cxx_dialect
== cxx98
)
4148 tree bad_alloc_type_node
;
4149 tree bad_alloc_decl
;
4151 push_namespace (std_identifier
);
4152 bad_alloc_id
= get_identifier ("bad_alloc");
4153 bad_alloc_type_node
= make_class_type (RECORD_TYPE
);
4154 TYPE_CONTEXT (bad_alloc_type_node
) = current_namespace
;
4156 = create_implicit_typedef (bad_alloc_id
, bad_alloc_type_node
);
4157 DECL_CONTEXT (bad_alloc_decl
) = current_namespace
;
4161 = add_exception_specifier (NULL_TREE
, bad_alloc_type_node
, -1);
4164 new_eh_spec
= noexcept_false_spec
;
4166 /* Ensure attribs.c is initialized. */
4169 /* Ensure constraint.cc is initialized. */
4170 init_constraint_processing ();
4172 extvisattr
= build_tree_list (get_identifier ("externally_visible"),
4174 newattrs
= tree_cons (get_identifier ("alloc_size"),
4175 build_tree_list (NULL_TREE
, integer_one_node
),
4177 newtype
= cp_build_type_attribute_variant (ptr_ftype_sizetype
, newattrs
);
4178 newtype
= build_exception_variant (newtype
, new_eh_spec
);
4179 deltype
= cp_build_type_attribute_variant (void_ftype_ptr
, extvisattr
);
4180 deltype
= build_exception_variant (deltype
, empty_except_spec
);
4181 tree opnew
= push_cp_library_fn (NEW_EXPR
, newtype
, 0);
4182 DECL_IS_MALLOC (opnew
) = 1;
4183 DECL_IS_OPERATOR_NEW (opnew
) = 1;
4184 opnew
= push_cp_library_fn (VEC_NEW_EXPR
, newtype
, 0);
4185 DECL_IS_MALLOC (opnew
) = 1;
4186 DECL_IS_OPERATOR_NEW (opnew
) = 1;
4187 push_cp_library_fn (DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4188 push_cp_library_fn (VEC_DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4189 if (flag_sized_deallocation
)
4191 /* Also push the sized deallocation variants:
4192 void operator delete(void*, std::size_t) throw();
4193 void operator delete[](void*, std::size_t) throw(); */
4194 tree void_ftype_ptr_size
4195 = build_function_type_list (void_type_node
, ptr_type_node
,
4196 size_type_node
, NULL_TREE
);
4197 deltype
= cp_build_type_attribute_variant (void_ftype_ptr_size
,
4199 deltype
= build_exception_variant (deltype
, empty_except_spec
);
4200 push_cp_library_fn (DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4201 push_cp_library_fn (VEC_DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4204 if (aligned_new_threshold
)
4206 push_namespace (std_identifier
);
4207 tree align_id
= get_identifier ("align_val_t");
4208 align_type_node
= start_enum (align_id
, NULL_TREE
, size_type_node
,
4209 NULL_TREE
, /*scoped*/true, NULL
);
4212 /* operator new (size_t, align_val_t); */
4213 newtype
= build_function_type_list (ptr_type_node
, size_type_node
,
4214 align_type_node
, NULL_TREE
);
4215 newtype
= cp_build_type_attribute_variant (newtype
, newattrs
);
4216 newtype
= build_exception_variant (newtype
, new_eh_spec
);
4217 opnew
= push_cp_library_fn (NEW_EXPR
, newtype
, 0);
4218 DECL_IS_MALLOC (opnew
) = 1;
4219 DECL_IS_OPERATOR_NEW (opnew
) = 1;
4220 opnew
= push_cp_library_fn (VEC_NEW_EXPR
, newtype
, 0);
4221 DECL_IS_MALLOC (opnew
) = 1;
4222 DECL_IS_OPERATOR_NEW (opnew
) = 1;
4224 /* operator delete (void *, align_val_t); */
4225 deltype
= build_function_type_list (void_type_node
, ptr_type_node
,
4226 align_type_node
, NULL_TREE
);
4227 deltype
= cp_build_type_attribute_variant (deltype
, extvisattr
);
4228 deltype
= build_exception_variant (deltype
, empty_except_spec
);
4229 push_cp_library_fn (DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4230 push_cp_library_fn (VEC_DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4232 if (flag_sized_deallocation
)
4234 /* operator delete (void *, size_t, align_val_t); */
4235 deltype
= build_function_type_list (void_type_node
, ptr_type_node
,
4236 size_type_node
, align_type_node
,
4238 deltype
= cp_build_type_attribute_variant (deltype
, extvisattr
);
4239 deltype
= build_exception_variant (deltype
, empty_except_spec
);
4240 push_cp_library_fn (DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4241 push_cp_library_fn (VEC_DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4245 nullptr_type_node
= make_node (NULLPTR_TYPE
);
4246 TYPE_SIZE (nullptr_type_node
) = bitsize_int (GET_MODE_BITSIZE (ptr_mode
));
4247 TYPE_SIZE_UNIT (nullptr_type_node
) = size_int (GET_MODE_SIZE (ptr_mode
));
4248 TYPE_UNSIGNED (nullptr_type_node
) = 1;
4249 TYPE_PRECISION (nullptr_type_node
) = GET_MODE_BITSIZE (ptr_mode
);
4250 if (abi_version_at_least (9))
4251 SET_TYPE_ALIGN (nullptr_type_node
, GET_MODE_ALIGNMENT (ptr_mode
));
4252 SET_TYPE_MODE (nullptr_type_node
, ptr_mode
);
4253 record_builtin_type (RID_MAX
, "decltype(nullptr)", nullptr_type_node
);
4254 nullptr_node
= build_int_cst (nullptr_type_node
, 0);
4258 = build_library_fn_ptr ("__cxa_pure_virtual", void_ftype
,
4259 ECF_NORETURN
| ECF_NOTHROW
| ECF_COLD
);
4261 /* Perform other language dependent initializations. */
4262 init_class_processing ();
4263 init_rtti_processing ();
4264 init_template_processing ();
4266 if (flag_exceptions
)
4267 init_exception_processing ();
4269 if (! supports_one_only ())
4272 make_fname_decl
= cp_make_fname_decl
;
4273 start_fname_decls ();
4275 /* Show we use EH for cleanups. */
4276 if (flag_exceptions
)
4277 using_eh_for_cleanups ();
4280 /* Generate an initializer for a function naming variable from
4281 NAME. NAME may be NULL, to indicate a dependent name. TYPE_P is
4282 filled in with the type of the init. */
4285 cp_fname_init (const char* name
, tree
*type_p
)
4287 tree domain
= NULL_TREE
;
4289 tree init
= NULL_TREE
;
4294 length
= strlen (name
);
4295 domain
= build_index_type (size_int (length
));
4296 init
= build_string (length
+ 1, name
);
4299 type
= cp_build_qualified_type (char_type_node
, TYPE_QUAL_CONST
);
4300 type
= build_cplus_array_type (type
, domain
);
4305 TREE_TYPE (init
) = type
;
4307 init
= error_mark_node
;
4312 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give
4313 the decl, LOC is the location to give the decl, NAME is the
4314 initialization string and TYPE_DEP indicates whether NAME depended
4315 on the type of the function. We make use of that to detect
4316 __PRETTY_FUNCTION__ inside a template fn. This is being done lazily
4317 at the point of first use, so we mustn't push the decl now. */
4320 cp_make_fname_decl (location_t loc
, tree id
, int type_dep
)
4322 const char *const name
= (type_dep
&& processing_template_decl
4323 ? NULL
: fname_as_string (type_dep
));
4325 tree init
= cp_fname_init (name
, &type
);
4326 tree decl
= build_decl (loc
, VAR_DECL
, id
, type
);
4329 free (CONST_CAST (char *, name
));
4331 TREE_STATIC (decl
) = 1;
4332 TREE_READONLY (decl
) = 1;
4333 DECL_ARTIFICIAL (decl
) = 1;
4335 TREE_USED (decl
) = 1;
4337 if (current_function_decl
)
4339 DECL_CONTEXT (decl
) = current_function_decl
;
4340 decl
= pushdecl_outermost_localscope (decl
);
4341 cp_finish_decl (decl
, init
, /*init_const_expr_p=*/false, NULL_TREE
,
4342 LOOKUP_ONLYCONVERTING
);
4346 DECL_THIS_STATIC (decl
) = true;
4347 pushdecl_top_level_and_finish (decl
, init
);
4354 builtin_function_1 (tree decl
, tree context
, bool is_global
)
4356 tree id
= DECL_NAME (decl
);
4357 const char *name
= IDENTIFIER_POINTER (id
);
4359 retrofit_lang_decl (decl
);
4361 DECL_ARTIFICIAL (decl
) = 1;
4362 SET_OVERLOADED_OPERATOR_CODE (decl
, ERROR_MARK
);
4363 SET_DECL_LANGUAGE (decl
, lang_c
);
4364 /* Runtime library routines are, by definition, available in an
4365 external shared object. */
4366 DECL_VISIBILITY (decl
) = VISIBILITY_DEFAULT
;
4367 DECL_VISIBILITY_SPECIFIED (decl
) = 1;
4369 DECL_CONTEXT (decl
) = context
;
4371 /* A function in the user's namespace should have an explicit
4372 declaration before it is used. Mark the built-in function as
4373 anticipated but not actually declared. */
4374 if (name
[0] != '_' || name
[1] != '_')
4375 DECL_ANTICIPATED (decl
) = 1;
4376 else if (strncmp (name
+ 2, "builtin_", strlen ("builtin_")) != 0)
4378 size_t len
= strlen (name
);
4380 /* Treat __*_chk fortification functions as anticipated as well,
4381 unless they are __builtin_*. */
4382 if (len
> strlen ("___chk")
4383 && memcmp (name
+ len
- strlen ("_chk"),
4384 "_chk", strlen ("_chk") + 1) == 0)
4385 DECL_ANTICIPATED (decl
) = 1;
4389 pushdecl_top_level (decl
);
4397 cxx_builtin_function (tree decl
)
4399 tree id
= DECL_NAME (decl
);
4400 const char *name
= IDENTIFIER_POINTER (id
);
4401 /* All builtins that don't begin with an '_' should additionally
4402 go in the 'std' namespace. */
4405 tree decl2
= copy_node(decl
);
4406 push_namespace (std_identifier
);
4407 builtin_function_1 (decl2
, std_node
, false);
4411 return builtin_function_1 (decl
, NULL_TREE
, false);
4414 /* Like cxx_builtin_function, but guarantee the function is added to the global
4415 scope. This is to allow function specific options to add new machine
4416 dependent builtins when the target ISA changes via attribute((target(...)))
4417 which saves space on program startup if the program does not use non-generic
4421 cxx_builtin_function_ext_scope (tree decl
)
4424 tree id
= DECL_NAME (decl
);
4425 const char *name
= IDENTIFIER_POINTER (id
);
4426 /* All builtins that don't begin with an '_' should additionally
4427 go in the 'std' namespace. */
4430 tree decl2
= copy_node(decl
);
4431 push_namespace (std_identifier
);
4432 builtin_function_1 (decl2
, std_node
, true);
4436 return builtin_function_1 (decl
, NULL_TREE
, true);
4439 /* Generate a FUNCTION_DECL with the typical flags for a runtime library
4440 function. Not called directly. */
4443 build_library_fn (tree name
, enum tree_code operator_code
, tree type
,
4446 tree fn
= build_lang_decl (FUNCTION_DECL
, name
, type
);
4447 DECL_EXTERNAL (fn
) = 1;
4448 TREE_PUBLIC (fn
) = 1;
4449 DECL_ARTIFICIAL (fn
) = 1;
4450 SET_OVERLOADED_OPERATOR_CODE (fn
, operator_code
);
4451 SET_DECL_LANGUAGE (fn
, lang_c
);
4452 /* Runtime library routines are, by definition, available in an
4453 external shared object. */
4454 DECL_VISIBILITY (fn
) = VISIBILITY_DEFAULT
;
4455 DECL_VISIBILITY_SPECIFIED (fn
) = 1;
4456 set_call_expr_flags (fn
, ecf_flags
);
4460 /* Returns the _DECL for a library function with C++ linkage. */
4463 build_cp_library_fn (tree name
, enum tree_code operator_code
, tree type
,
4466 tree fn
= build_library_fn (name
, operator_code
, type
, ecf_flags
);
4467 DECL_CONTEXT (fn
) = FROB_CONTEXT (current_namespace
);
4468 SET_DECL_LANGUAGE (fn
, lang_cplusplus
);
4472 /* Like build_library_fn, but takes a C string instead of an
4476 build_library_fn_ptr (const char* name
, tree type
, int ecf_flags
)
4478 return build_library_fn (get_identifier (name
), ERROR_MARK
, type
, ecf_flags
);
4481 /* Like build_cp_library_fn, but takes a C string instead of an
4485 build_cp_library_fn_ptr (const char* name
, tree type
, int ecf_flags
)
4487 return build_cp_library_fn (get_identifier (name
), ERROR_MARK
, type
,
4491 /* Like build_library_fn, but also pushes the function so that we will
4492 be able to find it via get_global_binding. Also, the function
4493 may throw exceptions listed in RAISES. */
4496 push_library_fn (tree name
, tree type
, tree raises
, int ecf_flags
)
4501 type
= build_exception_variant (type
, raises
);
4503 fn
= build_library_fn (name
, ERROR_MARK
, type
, ecf_flags
);
4504 pushdecl_top_level (fn
);
4508 /* Like build_cp_library_fn, but also pushes the function so that it
4509 will be found by normal lookup. */
4512 push_cp_library_fn (enum tree_code operator_code
, tree type
,
4515 tree fn
= build_cp_library_fn (cp_operator_id (operator_code
),
4520 apply_tm_attr (fn
, get_identifier ("transaction_safe"));
4524 /* Like push_library_fn, but takes a TREE_LIST of parm types rather than
4528 push_void_library_fn (tree name
, tree parmtypes
, int ecf_flags
)
4530 tree type
= build_function_type (void_type_node
, parmtypes
);
4531 return push_library_fn (name
, type
, NULL_TREE
, ecf_flags
);
4534 /* Like push_library_fn, but also note that this function throws
4535 and does not return. Used for __throw_foo and the like. */
4538 push_throw_library_fn (tree name
, tree type
)
4540 tree fn
= push_library_fn (name
, type
, NULL_TREE
, ECF_NORETURN
| ECF_COLD
);
4544 /* When we call finish_struct for an anonymous union, we create
4545 default copy constructors and such. But, an anonymous union
4546 shouldn't have such things; this function undoes the damage to the
4547 anonymous union type T.
4549 (The reason that we create the synthesized methods is that we don't
4550 distinguish `union { int i; }' from `typedef union { int i; } U'.
4551 The first is an anonymous union; the second is just an ordinary
4555 fixup_anonymous_aggr (tree t
)
4557 /* Wipe out memory of synthesized methods. */
4558 TYPE_HAS_USER_CONSTRUCTOR (t
) = 0;
4559 TYPE_HAS_DEFAULT_CONSTRUCTOR (t
) = 0;
4560 TYPE_HAS_COPY_CTOR (t
) = 0;
4561 TYPE_HAS_CONST_COPY_CTOR (t
) = 0;
4562 TYPE_HAS_COPY_ASSIGN (t
) = 0;
4563 TYPE_HAS_CONST_COPY_ASSIGN (t
) = 0;
4565 /* Splice the implicitly generated functions out of TYPE_FIELDS. */
4566 for (tree probe
, *prev_p
= &TYPE_FIELDS (t
); (probe
= *prev_p
);)
4567 if (TREE_CODE (probe
) == FUNCTION_DECL
&& DECL_ARTIFICIAL (probe
))
4568 *prev_p
= DECL_CHAIN (probe
);
4570 prev_p
= &DECL_CHAIN (probe
);
4572 /* Anonymous aggregates cannot have fields with ctors, dtors or complex
4573 assignment operators (because they cannot have these methods themselves).
4574 For anonymous unions this is already checked because they are not allowed
4575 in any union, otherwise we have to check it. */
4576 if (TREE_CODE (t
) != UNION_TYPE
)
4580 for (field
= TYPE_FIELDS (t
); field
; field
= DECL_CHAIN (field
))
4581 if (TREE_CODE (field
) == FIELD_DECL
)
4583 type
= TREE_TYPE (field
);
4584 if (CLASS_TYPE_P (type
))
4586 if (TYPE_NEEDS_CONSTRUCTING (type
))
4587 error ("member %q+#D with constructor not allowed "
4588 "in anonymous aggregate", field
);
4589 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type
))
4590 error ("member %q+#D with destructor not allowed "
4591 "in anonymous aggregate", field
);
4592 if (TYPE_HAS_COMPLEX_COPY_ASSIGN (type
))
4593 error ("member %q+#D with copy assignment operator "
4594 "not allowed in anonymous aggregate", field
);
4600 /* Warn for an attribute located at LOCATION that appertains to the
4601 class type CLASS_TYPE that has not been properly placed after its
4602 class-key, in it class-specifier. */
4605 warn_misplaced_attr_for_class_type (source_location location
,
4608 gcc_assert (OVERLOAD_TYPE_P (class_type
));
4610 if (warning_at (location
, OPT_Wattributes
,
4611 "attribute ignored in declaration "
4612 "of %q#T", class_type
))
4614 "attribute for %q#T must follow the %qs keyword",
4615 class_type
, class_key_or_enum_as_string (class_type
));
4618 /* Make sure that a declaration with no declarator is well-formed, i.e.
4619 just declares a tagged type or anonymous union.
4621 Returns the type declared; or NULL_TREE if none. */
4624 check_tag_decl (cp_decl_specifier_seq
*declspecs
,
4625 bool explicit_type_instantiation_p
)
4627 int saw_friend
= decl_spec_seq_has_spec_p (declspecs
, ds_friend
);
4628 int saw_typedef
= decl_spec_seq_has_spec_p (declspecs
, ds_typedef
);
4629 /* If a class, struct, or enum type is declared by the DECLSPECS
4630 (i.e, if a class-specifier, enum-specifier, or non-typename
4631 elaborated-type-specifier appears in the DECLSPECS),
4632 DECLARED_TYPE is set to the corresponding type. */
4633 tree declared_type
= NULL_TREE
;
4634 bool error_p
= false;
4636 if (declspecs
->multiple_types_p
)
4637 error ("multiple types in one declaration");
4638 else if (declspecs
->redefined_builtin_type
)
4640 if (!in_system_header_at (input_location
))
4641 permerror (declspecs
->locations
[ds_redefined_builtin_type_spec
],
4642 "redeclaration of C++ built-in type %qT",
4643 declspecs
->redefined_builtin_type
);
4648 && TYPE_P (declspecs
->type
)
4649 && ((TREE_CODE (declspecs
->type
) != TYPENAME_TYPE
4650 && MAYBE_CLASS_TYPE_P (declspecs
->type
))
4651 || TREE_CODE (declspecs
->type
) == ENUMERAL_TYPE
))
4652 declared_type
= declspecs
->type
;
4653 else if (declspecs
->type
== error_mark_node
)
4655 if (declared_type
== NULL_TREE
&& ! saw_friend
&& !error_p
)
4656 permerror (input_location
, "declaration does not declare anything");
4657 else if (declared_type
!= NULL_TREE
&& type_uses_auto (declared_type
))
4659 error_at (declspecs
->locations
[ds_type_spec
],
4660 "%<auto%> can only be specified for variables "
4661 "or function declarations");
4662 return error_mark_node
;
4664 /* Check for an anonymous union. */
4665 else if (declared_type
&& RECORD_OR_UNION_CODE_P (TREE_CODE (declared_type
))
4666 && TYPE_UNNAMED_P (declared_type
))
4668 /* 7/3 In a simple-declaration, the optional init-declarator-list
4669 can be omitted only when declaring a class (clause 9) or
4670 enumeration (7.2), that is, when the decl-specifier-seq contains
4671 either a class-specifier, an elaborated-type-specifier with
4672 a class-key (9.1), or an enum-specifier. In these cases and
4673 whenever a class-specifier or enum-specifier is present in the
4674 decl-specifier-seq, the identifiers in these specifiers are among
4675 the names being declared by the declaration (as class-name,
4676 enum-names, or enumerators, depending on the syntax). In such
4677 cases, and except for the declaration of an unnamed bit-field (9.6),
4678 the decl-specifier-seq shall introduce one or more names into the
4679 program, or shall redeclare a name introduced by a previous
4680 declaration. [Example:
4681 enum { }; // ill-formed
4682 typedef class { }; // ill-formed
4686 error ("missing type-name in typedef-declaration");
4689 /* Anonymous unions are objects, so they can have specifiers. */;
4690 SET_ANON_AGGR_TYPE_P (declared_type
);
4692 if (TREE_CODE (declared_type
) != UNION_TYPE
4693 && !in_system_header_at (input_location
))
4694 pedwarn (input_location
, OPT_Wpedantic
, "ISO C++ prohibits anonymous structs");
4699 if (decl_spec_seq_has_spec_p (declspecs
, ds_inline
))
4700 error_at (declspecs
->locations
[ds_inline
],
4701 "%<inline%> can only be specified for functions");
4702 else if (decl_spec_seq_has_spec_p (declspecs
, ds_virtual
))
4703 error_at (declspecs
->locations
[ds_virtual
],
4704 "%<virtual%> can only be specified for functions");
4706 && (!current_class_type
4707 || current_scope () != current_class_type
))
4708 error_at (declspecs
->locations
[ds_friend
],
4709 "%<friend%> can only be specified inside a class");
4710 else if (decl_spec_seq_has_spec_p (declspecs
, ds_explicit
))
4711 error_at (declspecs
->locations
[ds_explicit
],
4712 "%<explicit%> can only be specified for constructors");
4713 else if (declspecs
->storage_class
)
4714 error_at (declspecs
->locations
[ds_storage_class
],
4715 "a storage class can only be specified for objects "
4717 else if (decl_spec_seq_has_spec_p (declspecs
, ds_const
))
4718 error_at (declspecs
->locations
[ds_const
],
4719 "%<const%> can only be specified for objects and "
4721 else if (decl_spec_seq_has_spec_p (declspecs
, ds_volatile
))
4722 error_at (declspecs
->locations
[ds_volatile
],
4723 "%<volatile%> can only be specified for objects and "
4725 else if (decl_spec_seq_has_spec_p (declspecs
, ds_restrict
))
4726 error_at (declspecs
->locations
[ds_restrict
],
4727 "%<__restrict%> can only be specified for objects and "
4729 else if (decl_spec_seq_has_spec_p (declspecs
, ds_thread
))
4730 error_at (declspecs
->locations
[ds_thread
],
4731 "%<__thread%> can only be specified for objects "
4733 else if (saw_typedef
)
4734 warning_at (declspecs
->locations
[ds_typedef
], 0,
4735 "%<typedef%> was ignored in this declaration");
4736 else if (decl_spec_seq_has_spec_p (declspecs
, ds_constexpr
))
4737 error_at (declspecs
->locations
[ds_constexpr
],
4738 "%<constexpr%> cannot be used for type declarations");
4741 if (declspecs
->attributes
&& warn_attributes
&& declared_type
)
4744 if (!CLASS_TYPE_P (declared_type
)
4745 || !CLASSTYPE_TEMPLATE_INSTANTIATION (declared_type
))
4746 /* For a non-template class, use the name location. */
4747 loc
= location_of (declared_type
);
4749 /* For a template class (an explicit instantiation), use the
4750 current location. */
4751 loc
= input_location
;
4753 if (explicit_type_instantiation_p
)
4754 /* [dcl.attr.grammar]/4:
4756 No attribute-specifier-seq shall appertain to an explicit
4759 if (warning_at (loc
, OPT_Wattributes
,
4760 "attribute ignored in explicit instantiation %q#T",
4763 "no attribute can be applied to "
4764 "an explicit instantiation");
4767 warn_misplaced_attr_for_class_type (loc
, declared_type
);
4770 return declared_type
;
4773 /* Called when a declaration is seen that contains no names to declare.
4774 If its type is a reference to a structure, union or enum inherited
4775 from a containing scope, shadow that tag name for the current scope
4776 with a forward reference.
4777 If its type defines a new named structure or union
4778 or defines an enum, it is valid but we need not do anything here.
4779 Otherwise, it is an error.
4781 C++: may have to grok the declspecs to learn about static,
4782 complain for anonymous unions.
4784 Returns the TYPE declared -- or NULL_TREE if none. */
4787 shadow_tag (cp_decl_specifier_seq
*declspecs
)
4789 tree t
= check_tag_decl (declspecs
,
4790 /*explicit_type_instantiation_p=*/false);
4795 if (maybe_process_partial_specialization (t
) == error_mark_node
)
4798 /* This is where the variables in an anonymous union are
4799 declared. An anonymous union declaration looks like:
4801 because there is no declarator after the union, the parser
4802 sends that declaration here. */
4803 if (ANON_AGGR_TYPE_P (t
))
4805 fixup_anonymous_aggr (t
);
4807 if (TYPE_FIELDS (t
))
4809 tree decl
= grokdeclarator (/*declarator=*/NULL
,
4810 declspecs
, NORMAL
, 0, NULL
);
4811 finish_anon_union (decl
);
4818 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
4821 groktypename (cp_decl_specifier_seq
*type_specifiers
,
4822 const cp_declarator
*declarator
,
4823 bool is_template_arg
)
4827 enum decl_context context
4828 = is_template_arg
? TEMPLATE_TYPE_ARG
: TYPENAME
;
4829 attrs
= type_specifiers
->attributes
;
4830 type_specifiers
->attributes
= NULL_TREE
;
4831 type
= grokdeclarator (declarator
, type_specifiers
, context
, 0, &attrs
);
4832 if (attrs
&& type
!= error_mark_node
)
4834 if (CLASS_TYPE_P (type
))
4835 warning (OPT_Wattributes
, "ignoring attributes applied to class type %qT "
4836 "outside of definition", type
);
4837 else if (MAYBE_CLASS_TYPE_P (type
))
4838 /* A template type parameter or other dependent type. */
4839 warning (OPT_Wattributes
, "ignoring attributes applied to dependent "
4840 "type %qT without an associated declaration", type
);
4842 cplus_decl_attributes (&type
, attrs
, 0);
4847 /* Process a DECLARATOR for a function-scope variable declaration,
4848 namespace-scope variable declaration, or function declaration.
4849 (Function definitions go through start_function; class member
4850 declarations appearing in the body of the class go through
4851 grokfield.) The DECL corresponding to the DECLARATOR is returned.
4852 If an error occurs, the error_mark_node is returned instead.
4854 DECLSPECS are the decl-specifiers for the declaration. INITIALIZED is
4855 SD_INITIALIZED if an explicit initializer is present, or SD_DEFAULTED
4856 for an explicitly defaulted function, or SD_DELETED for an explicitly
4857 deleted function, but 0 (SD_UNINITIALIZED) if this is a variable
4858 implicitly initialized via a default constructor. ATTRIBUTES and
4859 PREFIX_ATTRIBUTES are GNU attributes associated with this declaration.
4861 The scope represented by the context of the returned DECL is pushed
4862 (if it is not the global namespace) and is assigned to
4863 *PUSHED_SCOPE_P. The caller is then responsible for calling
4864 pop_scope on *PUSHED_SCOPE_P if it is set. */
4867 start_decl (const cp_declarator
*declarator
,
4868 cp_decl_specifier_seq
*declspecs
,
4871 tree prefix_attributes
,
4872 tree
*pushed_scope_p
)
4880 *pushed_scope_p
= NULL_TREE
;
4882 /* An object declared as __attribute__((deprecated)) suppresses
4883 warnings of uses of other deprecated items. */
4884 if (lookup_attribute ("deprecated", attributes
))
4885 deprecated_state
= DEPRECATED_SUPPRESS
;
4887 attributes
= chainon (attributes
, prefix_attributes
);
4889 decl
= grokdeclarator (declarator
, declspecs
, NORMAL
, initialized
,
4892 deprecated_state
= DEPRECATED_NORMAL
;
4894 if (decl
== NULL_TREE
|| VOID_TYPE_P (decl
)
4895 || decl
== error_mark_node
)
4896 return error_mark_node
;
4898 context
= CP_DECL_CONTEXT (decl
);
4899 if (context
!= global_namespace
)
4900 *pushed_scope_p
= push_scope (context
);
4902 /* Is it valid for this decl to have an initializer at all?
4903 If not, set INITIALIZED to zero, which will indirectly
4904 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
4906 && TREE_CODE (decl
) == TYPE_DECL
)
4908 error ("typedef %qD is initialized (use decltype instead)", decl
);
4909 return error_mark_node
;
4914 if (! toplevel_bindings_p ()
4915 && DECL_EXTERNAL (decl
))
4916 warning (0, "declaration of %q#D has %<extern%> and is initialized",
4918 DECL_EXTERNAL (decl
) = 0;
4919 if (toplevel_bindings_p ())
4920 TREE_STATIC (decl
) = 1;
4922 alias
= lookup_attribute ("alias", DECL_ATTRIBUTES (decl
)) != 0;
4924 if (alias
&& TREE_CODE (decl
) == FUNCTION_DECL
)
4925 record_key_method_defined (decl
);
4927 /* If this is a typedef that names the class for linkage purposes
4928 (7.1.3p8), apply any attributes directly to the type. */
4929 if (TREE_CODE (decl
) == TYPE_DECL
4930 && OVERLOAD_TYPE_P (TREE_TYPE (decl
))
4931 && decl
== TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (decl
))))
4932 flags
= ATTR_FLAG_TYPE_IN_PLACE
;
4936 /* Set attributes here so if duplicate decl, will have proper attributes. */
4937 cplus_decl_attributes (&decl
, attributes
, flags
);
4939 /* Dllimported symbols cannot be defined. Static data members (which
4940 can be initialized in-class and dllimported) go through grokfield,
4941 not here, so we don't need to exclude those decls when checking for
4943 if (initialized
&& DECL_DLLIMPORT_P (decl
))
4945 error ("definition of %q#D is marked %<dllimport%>", decl
);
4946 DECL_DLLIMPORT_P (decl
) = 0;
4949 /* If #pragma weak was used, mark the decl weak now. */
4950 if (!processing_template_decl
)
4951 maybe_apply_pragma_weak (decl
);
4953 if (TREE_CODE (decl
) == FUNCTION_DECL
4954 && DECL_DECLARED_INLINE_P (decl
)
4955 && DECL_UNINLINABLE (decl
)
4956 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl
)))
4957 warning_at (DECL_SOURCE_LOCATION (decl
), 0,
4958 "inline function %qD given attribute noinline", decl
);
4960 if (TYPE_P (context
) && COMPLETE_TYPE_P (complete_type (context
)))
4962 bool this_tmpl
= (processing_template_decl
4963 > template_class_depth (context
));
4966 tree field
= lookup_field (context
, DECL_NAME (decl
), 0, false);
4967 if (field
== NULL_TREE
4968 || !(VAR_P (field
) || variable_template_p (field
)))
4969 error ("%q+#D is not a static data member of %q#T", decl
, context
);
4970 else if (variable_template_p (field
) && !this_tmpl
)
4972 if (DECL_LANG_SPECIFIC (decl
)
4973 && DECL_TEMPLATE_SPECIALIZATION (decl
))
4974 /* OK, specialization was already checked. */;
4977 error_at (DECL_SOURCE_LOCATION (decl
),
4978 "non-member-template declaration of %qD", decl
);
4979 inform (DECL_SOURCE_LOCATION (field
), "does not match "
4980 "member template declaration here");
4981 return error_mark_node
;
4986 if (variable_template_p (field
))
4987 field
= DECL_TEMPLATE_RESULT (field
);
4989 if (DECL_CONTEXT (field
) != context
)
4991 if (!same_type_p (DECL_CONTEXT (field
), context
))
4992 permerror (input_location
, "ISO C++ does not permit %<%T::%D%> "
4993 "to be defined as %<%T::%D%>",
4994 DECL_CONTEXT (field
), DECL_NAME (decl
),
4995 context
, DECL_NAME (decl
));
4996 DECL_CONTEXT (decl
) = DECL_CONTEXT (field
);
4998 /* Static data member are tricky; an in-class initialization
4999 still doesn't provide a definition, so the in-class
5000 declaration will have DECL_EXTERNAL set, but will have an
5001 initialization. Thus, duplicate_decls won't warn
5002 about this situation, and so we check here. */
5003 if (initialized
&& DECL_INITIALIZED_IN_CLASS_P (field
))
5004 error ("duplicate initialization of %qD", decl
);
5005 field
= duplicate_decls (decl
, field
,
5006 /*newdecl_is_friend=*/false);
5007 if (field
== error_mark_node
)
5008 return error_mark_node
;
5015 tree field
= check_classfn (context
, decl
,
5017 ? current_template_parms
5019 if (field
&& field
!= error_mark_node
5020 && duplicate_decls (decl
, field
,
5021 /*newdecl_is_friend=*/false))
5025 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
5026 DECL_IN_AGGR_P (decl
) = 0;
5027 /* Do not mark DECL as an explicit specialization if it was not
5028 already marked as an instantiation; a declaration should
5029 never be marked as a specialization unless we know what
5030 template is being specialized. */
5031 if (DECL_LANG_SPECIFIC (decl
) && DECL_USE_TEMPLATE (decl
))
5033 SET_DECL_TEMPLATE_SPECIALIZATION (decl
);
5034 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5035 DECL_COMDAT (decl
) = (TREE_PUBLIC (decl
)
5036 && DECL_DECLARED_INLINE_P (decl
));
5038 DECL_COMDAT (decl
) = false;
5040 /* [temp.expl.spec] An explicit specialization of a static data
5041 member of a template is a definition if the declaration
5042 includes an initializer; otherwise, it is a declaration.
5044 We check for processing_specialization so this only applies
5045 to the new specialization syntax. */
5046 if (!initialized
&& processing_specialization
)
5047 DECL_EXTERNAL (decl
) = 1;
5050 if (DECL_EXTERNAL (decl
) && ! DECL_TEMPLATE_SPECIALIZATION (decl
)
5051 /* Aliases are definitions. */
5053 permerror (input_location
, "declaration of %q#D outside of class is not definition",
5057 was_public
= TREE_PUBLIC (decl
);
5059 /* Enter this declaration into the symbol table. Don't push the plain
5060 VAR_DECL for a variable template. */
5061 if (!template_parm_scope_p ()
5063 decl
= maybe_push_decl (decl
);
5065 if (processing_template_decl
)
5066 decl
= push_template_decl (decl
);
5067 if (decl
== error_mark_node
)
5068 return error_mark_node
;
5071 && DECL_NAMESPACE_SCOPE_P (decl
) && !TREE_PUBLIC (decl
) && !was_public
5072 && !DECL_THIS_STATIC (decl
) && !DECL_ARTIFICIAL (decl
))
5074 /* This is a const variable with implicit 'static'. Set
5075 DECL_THIS_STATIC so we can tell it from variables that are
5076 !TREE_PUBLIC because of the anonymous namespace. */
5077 gcc_assert (CP_TYPE_CONST_P (TREE_TYPE (decl
)) || errorcount
);
5078 DECL_THIS_STATIC (decl
) = 1;
5081 if (current_function_decl
&& VAR_P (decl
)
5082 && DECL_DECLARED_CONSTEXPR_P (current_function_decl
))
5085 if (CP_DECL_THREAD_LOCAL_P (decl
))
5086 error ("%qD declared %<thread_local%> in %<constexpr%> function",
5088 else if (TREE_STATIC (decl
))
5089 error ("%qD declared %<static%> in %<constexpr%> function", decl
);
5093 cp_function_chain
->invalid_constexpr
= true;
5096 if (!processing_template_decl
&& VAR_P (decl
))
5097 start_decl_1 (decl
, initialized
);
5102 /* Process the declaration of a variable DECL. INITIALIZED is true
5103 iff DECL is explicitly initialized. (INITIALIZED is false if the
5104 variable is initialized via an implicitly-called constructor.)
5105 This function must be called for ordinary variables (including, for
5106 example, implicit instantiations of templates), but must not be
5107 called for template declarations. */
5110 start_decl_1 (tree decl
, bool initialized
)
5114 bool aggregate_definition_p
;
5116 gcc_assert (!processing_template_decl
);
5118 if (error_operand_p (decl
))
5121 gcc_assert (VAR_P (decl
));
5123 type
= TREE_TYPE (decl
);
5124 complete_p
= COMPLETE_TYPE_P (type
);
5125 aggregate_definition_p
= MAYBE_CLASS_TYPE_P (type
) && !DECL_EXTERNAL (decl
);
5127 /* If an explicit initializer is present, or if this is a definition
5128 of an aggregate, then we need a complete type at this point.
5129 (Scalars are always complete types, so there is nothing to
5130 check.) This code just sets COMPLETE_P; errors (if necessary)
5131 are issued below. */
5132 if ((initialized
|| aggregate_definition_p
)
5134 && COMPLETE_TYPE_P (complete_type (type
)))
5137 /* We will not yet have set TREE_READONLY on DECL if the type
5138 was "const", but incomplete, before this point. But, now, we
5139 have a complete type, so we can try again. */
5140 cp_apply_type_quals_to_decl (cp_type_quals (type
), decl
);
5144 /* Is it valid for this decl to have an initializer at all? */
5146 /* Don't allow initializations for incomplete types except for
5147 arrays which might be completed by the initialization. */
5149 ; /* A complete type is ok. */
5150 else if (type_uses_auto (type
))
5151 ; /* An auto type is ok. */
5152 else if (TREE_CODE (type
) != ARRAY_TYPE
)
5154 error ("variable %q#D has initializer but incomplete type", decl
);
5155 type
= TREE_TYPE (decl
) = error_mark_node
;
5157 else if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type
))))
5159 if (DECL_LANG_SPECIFIC (decl
) && DECL_TEMPLATE_INFO (decl
))
5160 error ("elements of array %q#D have incomplete type", decl
);
5161 /* else we already gave an error in start_decl. */
5164 else if (aggregate_definition_p
&& !complete_p
)
5166 if (type_uses_auto (type
))
5167 gcc_assert (CLASS_PLACEHOLDER_TEMPLATE (type
));
5170 error ("aggregate %q#D has incomplete type and cannot be defined",
5172 /* Change the type so that assemble_variable will give
5173 DECL an rtl we can live with: (mem (const_int 0)). */
5174 type
= TREE_TYPE (decl
) = error_mark_node
;
5178 /* Create a new scope to hold this declaration if necessary.
5179 Whether or not a new scope is necessary cannot be determined
5180 until after the type has been completed; if the type is a
5181 specialization of a class template it is not until after
5182 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
5183 will be set correctly. */
5184 maybe_push_cleanup_level (type
);
5187 /* Handle initialization of references. DECL, TYPE, and INIT have the
5188 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
5189 but will be set to a new CLEANUP_STMT if a temporary is created
5190 that must be destroyed subsequently.
5192 Returns an initializer expression to use to initialize DECL, or
5193 NULL if the initialization can be performed statically.
5195 Quotes on semantics can be found in ARM 8.4.3. */
5198 grok_reference_init (tree decl
, tree type
, tree init
, int flags
)
5200 if (init
== NULL_TREE
)
5202 if ((DECL_LANG_SPECIFIC (decl
) == 0
5203 || DECL_IN_AGGR_P (decl
) == 0)
5204 && ! DECL_THIS_EXTERN (decl
))
5205 error ("%qD declared as reference but not initialized", decl
);
5209 if (TREE_CODE (init
) == TREE_LIST
)
5210 init
= build_x_compound_expr_from_list (init
, ELK_INIT
,
5211 tf_warning_or_error
);
5213 tree ttype
= TREE_TYPE (type
);
5214 if (TREE_CODE (ttype
) != ARRAY_TYPE
5215 && TREE_CODE (TREE_TYPE (init
)) == ARRAY_TYPE
)
5216 /* Note: default conversion is only called in very special cases. */
5217 init
= decay_conversion (init
, tf_warning_or_error
);
5219 /* check_initializer handles this for non-reference variables, but for
5220 references we need to do it here or the initializer will get the
5221 incomplete array type and confuse later calls to
5222 cp_complete_array_type. */
5223 if (TREE_CODE (ttype
) == ARRAY_TYPE
5224 && TYPE_DOMAIN (ttype
) == NULL_TREE
5225 && (BRACE_ENCLOSED_INITIALIZER_P (init
)
5226 || TREE_CODE (init
) == STRING_CST
))
5228 cp_complete_array_type (&ttype
, init
, false);
5229 if (ttype
!= TREE_TYPE (type
))
5230 type
= cp_build_reference_type (ttype
, TYPE_REF_IS_RVALUE (type
));
5233 /* Convert INIT to the reference type TYPE. This may involve the
5234 creation of a temporary, whose lifetime must be the same as that
5235 of the reference. If so, a DECL_EXPR for the temporary will be
5236 added just after the DECL_EXPR for DECL. That's why we don't set
5237 DECL_INITIAL for local references (instead assigning to them
5238 explicitly); we need to allow the temporary to be initialized
5240 return initialize_reference (type
, init
, flags
,
5241 tf_warning_or_error
);
5244 /* Designated initializers in arrays are not supported in GNU C++.
5245 The parser cannot detect this error since it does not know whether
5246 a given brace-enclosed initializer is for a class type or for an
5247 array. This function checks that CE does not use a designated
5248 initializer. If it does, an error is issued. Returns true if CE
5249 is valid, i.e., does not have a designated initializer. */
5252 check_array_designated_initializer (constructor_elt
*ce
,
5253 unsigned HOST_WIDE_INT index
)
5255 /* Designated initializers for array elements are not supported. */
5258 /* The parser only allows identifiers as designated
5260 if (ce
->index
== error_mark_node
)
5262 error ("name used in a GNU-style designated "
5263 "initializer for an array");
5266 else if (identifier_p (ce
->index
))
5268 error ("name %qD used in a GNU-style designated "
5269 "initializer for an array", ce
->index
);
5273 tree ce_index
= build_expr_type_conversion (WANT_INT
| WANT_ENUM
,
5276 && INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (ce_index
))
5277 && (TREE_CODE (ce_index
= maybe_constant_value (ce_index
))
5280 /* A C99 designator is OK if it matches the current index. */
5281 if (wi::to_wide (ce_index
) == index
)
5284 sorry ("non-trivial designated initializers not supported");
5287 error ("C99 designator %qE is not an integral constant-expression",
5296 /* When parsing `int a[] = {1, 2};' we don't know the size of the
5297 array until we finish parsing the initializer. If that's the
5298 situation we're in, update DECL accordingly. */
5301 maybe_deduce_size_from_array_init (tree decl
, tree init
)
5303 tree type
= TREE_TYPE (decl
);
5305 if (TREE_CODE (type
) == ARRAY_TYPE
5306 && TYPE_DOMAIN (type
) == NULL_TREE
5307 && TREE_CODE (decl
) != TYPE_DECL
)
5309 /* do_default is really a C-ism to deal with tentative definitions.
5310 But let's leave it here to ease the eventual merge. */
5311 int do_default
= !DECL_EXTERNAL (decl
);
5312 tree initializer
= init
? init
: DECL_INITIAL (decl
);
5315 /* Check that there are no designated initializers in INIT, as
5316 those are not supported in GNU C++, and as the middle-end
5317 will crash if presented with a non-numeric designated
5319 if (initializer
&& BRACE_ENCLOSED_INITIALIZER_P (initializer
))
5321 vec
<constructor_elt
, va_gc
> *v
= CONSTRUCTOR_ELTS (initializer
);
5322 constructor_elt
*ce
;
5324 FOR_EACH_VEC_SAFE_ELT (v
, i
, ce
)
5325 if (!check_array_designated_initializer (ce
, i
))
5331 failure
= cp_complete_array_type (&TREE_TYPE (decl
), initializer
,
5335 error_at (EXPR_LOC_OR_LOC (initializer
,
5336 DECL_SOURCE_LOCATION (decl
)),
5337 "initializer fails to determine size of %qD", decl
);
5339 else if (failure
== 2)
5343 error_at (DECL_SOURCE_LOCATION (decl
),
5344 "array size missing in %qD", decl
);
5346 /* If a `static' var's size isn't known, make it extern as
5347 well as static, so it does not get allocated. If it's not
5348 `static', then don't mark it extern; finish_incomplete_decl
5349 will give it a default size and it will get allocated. */
5350 else if (!pedantic
&& TREE_STATIC (decl
) && !TREE_PUBLIC (decl
))
5351 DECL_EXTERNAL (decl
) = 1;
5353 else if (failure
== 3)
5355 error_at (DECL_SOURCE_LOCATION (decl
),
5356 "zero-size array %qD", decl
);
5360 cp_apply_type_quals_to_decl (cp_type_quals (TREE_TYPE (decl
)), decl
);
5362 relayout_decl (decl
);
5366 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
5367 any appropriate error messages regarding the layout. */
5370 layout_var_decl (tree decl
)
5374 type
= TREE_TYPE (decl
);
5375 if (type
== error_mark_node
)
5378 /* If we haven't already laid out this declaration, do so now.
5379 Note that we must not call complete type for an external object
5380 because it's type might involve templates that we are not
5381 supposed to instantiate yet. (And it's perfectly valid to say
5382 `extern X x' for some incomplete type `X'.) */
5383 if (!DECL_EXTERNAL (decl
))
5384 complete_type (type
);
5385 if (!DECL_SIZE (decl
)
5386 && TREE_TYPE (decl
) != error_mark_node
5387 && complete_or_array_type_p (type
))
5388 layout_decl (decl
, 0);
5390 if (!DECL_EXTERNAL (decl
) && DECL_SIZE (decl
) == NULL_TREE
)
5392 /* An automatic variable with an incomplete type: that is an error.
5393 Don't talk about array types here, since we took care of that
5394 message in grokdeclarator. */
5395 error_at (DECL_SOURCE_LOCATION (decl
),
5396 "storage size of %qD isn%'t known", decl
);
5397 TREE_TYPE (decl
) = error_mark_node
;
5400 /* Keep this code around in case we later want to control debug info
5401 based on whether a type is "used". (jason 1999-11-11) */
5403 else if (!DECL_EXTERNAL (decl
) && MAYBE_CLASS_TYPE_P (ttype
))
5404 /* Let debugger know it should output info for this type. */
5405 note_debug_info_needed (ttype
);
5407 if (TREE_STATIC (decl
) && DECL_CLASS_SCOPE_P (decl
))
5408 note_debug_info_needed (DECL_CONTEXT (decl
));
5411 if ((DECL_EXTERNAL (decl
) || TREE_STATIC (decl
))
5412 && DECL_SIZE (decl
) != NULL_TREE
5413 && ! TREE_CONSTANT (DECL_SIZE (decl
)))
5415 if (TREE_CODE (DECL_SIZE (decl
)) == INTEGER_CST
)
5416 constant_expression_warning (DECL_SIZE (decl
));
5419 error_at (DECL_SOURCE_LOCATION (decl
),
5420 "storage size of %qD isn%'t constant", decl
);
5421 TREE_TYPE (decl
) = error_mark_node
;
5426 /* If a local static variable is declared in an inline function, or if
5427 we have a weak definition, we must endeavor to create only one
5428 instance of the variable at link-time. */
5431 maybe_commonize_var (tree decl
)
5433 /* Static data in a function with comdat linkage also has comdat
5435 if ((TREE_STATIC (decl
)
5436 /* Don't mess with __FUNCTION__. */
5437 && ! DECL_ARTIFICIAL (decl
)
5438 && DECL_FUNCTION_SCOPE_P (decl
)
5439 && vague_linkage_p (DECL_CONTEXT (decl
)))
5440 || (TREE_PUBLIC (decl
) && DECL_INLINE_VAR_P (decl
)))
5444 /* With weak symbols, we simply make the variable COMDAT;
5445 that will cause copies in multiple translations units to
5447 comdat_linkage (decl
);
5451 if (DECL_INITIAL (decl
) == NULL_TREE
5452 || DECL_INITIAL (decl
) == error_mark_node
)
5454 /* Without weak symbols, we can use COMMON to merge
5455 uninitialized variables. */
5456 TREE_PUBLIC (decl
) = 1;
5457 DECL_COMMON (decl
) = 1;
5461 /* While for initialized variables, we must use internal
5462 linkage -- which means that multiple copies will not
5464 TREE_PUBLIC (decl
) = 0;
5465 DECL_COMMON (decl
) = 0;
5467 if (DECL_INLINE_VAR_P (decl
))
5468 msg
= G_("sorry: semantics of inline variable "
5469 "%q#D are wrong (you%'ll wind up with "
5470 "multiple copies)");
5472 msg
= G_("sorry: semantics of inline function "
5473 "static data %q#D are wrong (you%'ll wind "
5474 "up with multiple copies)");
5475 if (warning_at (DECL_SOURCE_LOCATION (decl
), 0,
5477 inform (DECL_SOURCE_LOCATION (decl
),
5478 "you can work around this by removing the initializer");
5484 /* Issue an error message if DECL is an uninitialized const variable. */
5487 check_for_uninitialized_const_var (tree decl
)
5489 tree type
= strip_array_types (TREE_TYPE (decl
));
5491 /* ``Unless explicitly declared extern, a const object does not have
5492 external linkage and must be initialized. ($8.4; $12.1)'' ARM
5495 && TREE_CODE (type
) != REFERENCE_TYPE
5496 && (CP_TYPE_CONST_P (type
) || var_in_constexpr_fn (decl
))
5497 && !DECL_INITIAL (decl
))
5499 tree field
= default_init_uninitialized_part (type
);
5503 if (CP_TYPE_CONST_P (type
))
5504 permerror (DECL_SOURCE_LOCATION (decl
),
5505 "uninitialized const %qD", decl
);
5508 if (!is_instantiation_of_constexpr (current_function_decl
))
5509 error_at (DECL_SOURCE_LOCATION (decl
),
5510 "uninitialized variable %qD in %<constexpr%> function",
5512 cp_function_chain
->invalid_constexpr
= true;
5515 if (CLASS_TYPE_P (type
))
5517 tree defaulted_ctor
;
5519 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (type
)),
5520 "%q#T has no user-provided default constructor", type
);
5521 defaulted_ctor
= in_class_defaulted_default_constructor (type
);
5523 inform (DECL_SOURCE_LOCATION (defaulted_ctor
),
5524 "constructor is not user-provided because it is "
5525 "explicitly defaulted in the class body");
5526 inform (DECL_SOURCE_LOCATION (field
),
5527 "and the implicitly-defined constructor does not "
5528 "initialize %q#D", field
);
5533 /* Structure holding the current initializer being processed by reshape_init.
5534 CUR is a pointer to the current element being processed, END is a pointer
5535 after the last element present in the initializer. */
5538 constructor_elt
*cur
;
5539 constructor_elt
*end
;
5542 static tree
reshape_init_r (tree
, reshape_iter
*, bool, tsubst_flags_t
);
5544 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
5545 returned is the next FIELD_DECL (possibly FIELD itself) that can be
5546 initialized. If there are no more such fields, the return value
5550 next_initializable_field (tree field
)
5553 && (TREE_CODE (field
) != FIELD_DECL
5554 || (DECL_C_BIT_FIELD (field
) && !DECL_NAME (field
))
5555 || (DECL_ARTIFICIAL (field
)
5556 && !(cxx_dialect
>= cxx17
&& DECL_FIELD_IS_BASE (field
)))))
5557 field
= DECL_CHAIN (field
);
5562 /* Return true for [dcl.init.list] direct-list-initialization from
5563 single element of enumeration with a fixed underlying type. */
5566 is_direct_enum_init (tree type
, tree init
)
5568 if (cxx_dialect
>= cxx17
5569 && TREE_CODE (type
) == ENUMERAL_TYPE
5570 && ENUM_FIXED_UNDERLYING_TYPE_P (type
)
5571 && TREE_CODE (init
) == CONSTRUCTOR
5572 && CONSTRUCTOR_IS_DIRECT_INIT (init
)
5573 && CONSTRUCTOR_NELTS (init
) == 1)
5578 /* Subroutine of reshape_init_array and reshape_init_vector, which does
5579 the actual work. ELT_TYPE is the element type of the array. MAX_INDEX is an
5580 INTEGER_CST representing the size of the array minus one (the maximum index),
5581 or NULL_TREE if the array was declared without specifying the size. D is
5582 the iterator within the constructor. */
5585 reshape_init_array_1 (tree elt_type
, tree max_index
, reshape_iter
*d
,
5586 tsubst_flags_t complain
)
5589 bool sized_array_p
= (max_index
&& TREE_CONSTANT (max_index
));
5590 unsigned HOST_WIDE_INT max_index_cst
= 0;
5591 unsigned HOST_WIDE_INT index
;
5593 /* The initializer for an array is always a CONSTRUCTOR. */
5594 new_init
= build_constructor (init_list_type_node
, NULL
);
5598 /* Minus 1 is used for zero sized arrays. */
5599 if (integer_all_onesp (max_index
))
5602 if (tree_fits_uhwi_p (max_index
))
5603 max_index_cst
= tree_to_uhwi (max_index
);
5604 /* sizetype is sign extended, not zero extended. */
5606 max_index_cst
= tree_to_uhwi (fold_convert (size_type_node
, max_index
));
5609 /* Loop until there are no more initializers. */
5611 d
->cur
!= d
->end
&& (!sized_array_p
|| index
<= max_index_cst
);
5615 constructor_elt
*old_cur
= d
->cur
;
5617 check_array_designated_initializer (d
->cur
, index
);
5618 elt_init
= reshape_init_r (elt_type
, d
, /*first_initializer_p=*/false,
5620 if (elt_init
== error_mark_node
)
5621 return error_mark_node
;
5622 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init
),
5623 size_int (index
), elt_init
);
5624 if (!TREE_CONSTANT (elt_init
))
5625 TREE_CONSTANT (new_init
) = false;
5627 /* This can happen with an invalid initializer (c++/54501). */
5628 if (d
->cur
== old_cur
&& !sized_array_p
)
5635 /* Subroutine of reshape_init_r, processes the initializers for arrays.
5636 Parameters are the same of reshape_init_r. */
5639 reshape_init_array (tree type
, reshape_iter
*d
, tsubst_flags_t complain
)
5641 tree max_index
= NULL_TREE
;
5643 gcc_assert (TREE_CODE (type
) == ARRAY_TYPE
);
5645 if (TYPE_DOMAIN (type
))
5646 max_index
= array_type_nelts (type
);
5648 return reshape_init_array_1 (TREE_TYPE (type
), max_index
, d
, complain
);
5651 /* Subroutine of reshape_init_r, processes the initializers for vectors.
5652 Parameters are the same of reshape_init_r. */
5655 reshape_init_vector (tree type
, reshape_iter
*d
, tsubst_flags_t complain
)
5657 tree max_index
= NULL_TREE
;
5659 gcc_assert (VECTOR_TYPE_P (type
));
5661 if (COMPOUND_LITERAL_P (d
->cur
->value
))
5663 tree value
= d
->cur
->value
;
5664 if (!same_type_p (TREE_TYPE (value
), type
))
5666 if (complain
& tf_error
)
5667 error ("invalid type %qT as initializer for a vector of type %qT",
5668 TREE_TYPE (d
->cur
->value
), type
);
5669 value
= error_mark_node
;
5675 /* For a vector, we initialize it as an array of the appropriate size. */
5676 if (VECTOR_TYPE_P (type
))
5677 max_index
= size_int (TYPE_VECTOR_SUBPARTS (type
) - 1);
5679 return reshape_init_array_1 (TREE_TYPE (type
), max_index
, d
, complain
);
5682 /* Subroutine of reshape_init_r, processes the initializers for classes
5683 or union. Parameters are the same of reshape_init_r. */
5686 reshape_init_class (tree type
, reshape_iter
*d
, bool first_initializer_p
,
5687 tsubst_flags_t complain
)
5692 gcc_assert (CLASS_TYPE_P (type
));
5694 /* The initializer for a class is always a CONSTRUCTOR. */
5695 new_init
= build_constructor (init_list_type_node
, NULL
);
5696 field
= next_initializable_field (TYPE_FIELDS (type
));
5702 An initializer for an aggregate member that is an
5703 empty class shall have the form of an empty
5704 initializer-list {}. */
5705 if (!first_initializer_p
)
5707 if (complain
& tf_error
)
5708 error ("initializer for %qT must be brace-enclosed", type
);
5709 return error_mark_node
;
5714 /* Loop through the initializable fields, gathering initializers. */
5715 while (d
->cur
!= d
->end
)
5718 constructor_elt
*old_cur
= d
->cur
;
5720 /* Handle designated initializers, as an extension. */
5723 if (d
->cur
->index
== error_mark_node
)
5724 return error_mark_node
;
5726 if (TREE_CODE (d
->cur
->index
) == FIELD_DECL
)
5727 /* We already reshaped this. */
5728 gcc_assert (d
->cur
->index
== field
);
5729 else if (TREE_CODE (d
->cur
->index
) == IDENTIFIER_NODE
)
5730 field
= get_class_binding (type
, d
->cur
->index
, false);
5733 if (complain
& tf_error
)
5734 error ("%<[%E] =%> used in a GNU-style designated initializer"
5735 " for class %qT", d
->cur
->index
, type
);
5736 return error_mark_node
;
5739 if (!field
|| TREE_CODE (field
) != FIELD_DECL
)
5741 if (complain
& tf_error
)
5742 error ("%qT has no non-static data member named %qD", type
,
5744 return error_mark_node
;
5748 /* If we processed all the member of the class, we are done. */
5752 field_init
= reshape_init_r (TREE_TYPE (field
), d
,
5753 /*first_initializer_p=*/false, complain
);
5754 if (field_init
== error_mark_node
)
5755 return error_mark_node
;
5757 if (d
->cur
== old_cur
&& d
->cur
->index
)
5759 /* This can happen with an invalid initializer for a flexible
5760 array member (c++/54441). */
5761 if (complain
& tf_error
)
5762 error ("invalid initializer for %q#D", field
);
5763 return error_mark_node
;
5766 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init
), field
, field_init
);
5770 When a union is initialized with a brace-enclosed
5771 initializer, the braces shall only contain an
5772 initializer for the first member of the union. */
5773 if (TREE_CODE (type
) == UNION_TYPE
)
5776 field
= next_initializable_field (DECL_CHAIN (field
));
5782 /* Subroutine of reshape_init_r. We're in a context where C99 initializer
5783 designators are not valid; either complain or return true to indicate
5784 that reshape_init_r should return error_mark_node. */
5787 has_designator_problem (reshape_iter
*d
, tsubst_flags_t complain
)
5791 if (complain
& tf_error
)
5792 error ("C99 designator %qE outside aggregate initializer",
5800 /* Subroutine of reshape_init, which processes a single initializer (part of
5801 a CONSTRUCTOR). TYPE is the type of the variable being initialized, D is the
5802 iterator within the CONSTRUCTOR which points to the initializer to process.
5803 FIRST_INITIALIZER_P is true if this is the first initializer of the
5804 outermost CONSTRUCTOR node. */
5807 reshape_init_r (tree type
, reshape_iter
*d
, bool first_initializer_p
,
5808 tsubst_flags_t complain
)
5810 tree init
= d
->cur
->value
;
5812 if (error_operand_p (init
))
5813 return error_mark_node
;
5815 if (first_initializer_p
&& !CP_AGGREGATE_TYPE_P (type
)
5816 && has_designator_problem (d
, complain
))
5817 return error_mark_node
;
5819 if (TREE_CODE (type
) == COMPLEX_TYPE
)
5821 /* A complex type can be initialized from one or two initializers,
5822 but braces are not elided. */
5824 if (BRACE_ENCLOSED_INITIALIZER_P (init
))
5826 if (CONSTRUCTOR_NELTS (init
) > 2)
5828 if (complain
& tf_error
)
5829 error ("too many initializers for %qT", type
);
5831 return error_mark_node
;
5834 else if (first_initializer_p
&& d
->cur
!= d
->end
)
5836 vec
<constructor_elt
, va_gc
> *v
= 0;
5837 CONSTRUCTOR_APPEND_ELT (v
, NULL_TREE
, init
);
5838 CONSTRUCTOR_APPEND_ELT (v
, NULL_TREE
, d
->cur
->value
);
5839 if (has_designator_problem (d
, complain
))
5840 return error_mark_node
;
5842 init
= build_constructor (init_list_type_node
, v
);
5847 /* A non-aggregate type is always initialized with a single
5849 if (!CP_AGGREGATE_TYPE_P (type
))
5851 /* It is invalid to initialize a non-aggregate type with a
5852 brace-enclosed initializer before C++0x.
5853 We need to check for BRACE_ENCLOSED_INITIALIZER_P here because
5854 of g++.old-deja/g++.mike/p7626.C: a pointer-to-member constant is
5855 a CONSTRUCTOR (with a record type). */
5856 if (TREE_CODE (init
) == CONSTRUCTOR
5857 /* Don't complain about a capture-init. */
5858 && !CONSTRUCTOR_IS_DIRECT_INIT (init
)
5859 && BRACE_ENCLOSED_INITIALIZER_P (init
)) /* p7626.C */
5861 if (SCALAR_TYPE_P (type
))
5863 if (cxx_dialect
< cxx11
5864 /* Isn't value-initialization. */
5865 || CONSTRUCTOR_NELTS (init
) > 0)
5867 if (complain
& tf_error
)
5868 error ("braces around scalar initializer for type %qT",
5870 init
= error_mark_node
;
5874 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS
);
5881 /* "If T is a class type and the initializer list has a single element of
5882 type cv U, where U is T or a class derived from T, the object is
5883 initialized from that element." Even if T is an aggregate. */
5884 if (cxx_dialect
>= cxx11
&& (CLASS_TYPE_P (type
) || VECTOR_TYPE_P (type
))
5885 && first_initializer_p
5886 && d
->end
- d
->cur
== 1
5887 && reference_related_p (type
, TREE_TYPE (init
)))
5895 All implicit type conversions (clause _conv_) are considered when
5896 initializing the aggregate member with an initializer from an
5897 initializer-list. If the initializer can initialize a member,
5898 the member is initialized. Otherwise, if the member is itself a
5899 non-empty subaggregate, brace elision is assumed and the
5900 initializer is considered for the initialization of the first
5901 member of the subaggregate. */
5902 if (TREE_CODE (init
) != CONSTRUCTOR
5903 /* But don't try this for the first initializer, since that would be
5904 looking through the outermost braces; A a2 = { a1 }; is not a
5905 valid aggregate initialization. */
5906 && !first_initializer_p
5907 && (same_type_ignoring_top_level_qualifiers_p (type
, TREE_TYPE (init
))
5908 || can_convert_arg (type
, TREE_TYPE (init
), init
, LOOKUP_NORMAL
,
5915 /* [dcl.init.string]
5917 A char array (whether plain char, signed char, or unsigned char)
5918 can be initialized by a string-literal (optionally enclosed in
5919 braces); a wchar_t array can be initialized by a wide
5920 string-literal (optionally enclosed in braces). */
5921 if (TREE_CODE (type
) == ARRAY_TYPE
5922 && char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (type
))))
5924 tree str_init
= init
;
5926 /* Strip one level of braces if and only if they enclose a single
5927 element (as allowed by [dcl.init.string]). */
5928 if (!first_initializer_p
5929 && TREE_CODE (str_init
) == CONSTRUCTOR
5930 && CONSTRUCTOR_NELTS (str_init
) == 1)
5932 str_init
= (*CONSTRUCTOR_ELTS (str_init
))[0].value
;
5935 /* If it's a string literal, then it's the initializer for the array
5936 as a whole. Otherwise, continue with normal initialization for
5937 array types (one value per array element). */
5938 if (TREE_CODE (str_init
) == STRING_CST
)
5940 if (has_designator_problem (d
, complain
))
5941 return error_mark_node
;
5947 /* The following cases are about aggregates. If we are not within a full
5948 initializer already, and there is not a CONSTRUCTOR, it means that there
5949 is a missing set of braces (that is, we are processing the case for
5950 which reshape_init exists). */
5951 if (!first_initializer_p
)
5953 if (TREE_CODE (init
) == CONSTRUCTOR
)
5955 if (TREE_TYPE (init
) && TYPE_PTRMEMFUNC_P (TREE_TYPE (init
)))
5956 /* There is no need to reshape pointer-to-member function
5957 initializers, as they are always constructed correctly
5958 by the front end. */
5960 else if (COMPOUND_LITERAL_P (init
))
5961 /* For a nested compound literal, there is no need to reshape since
5962 brace elision is not allowed. Even if we decided to allow it,
5963 we should add a call to reshape_init in finish_compound_literal,
5964 before calling digest_init, so changing this code would still
5965 not be necessary. */
5966 gcc_assert (!BRACE_ENCLOSED_INITIALIZER_P (init
));
5970 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init
));
5971 return reshape_init (type
, init
, complain
);
5975 if (complain
& tf_warning
)
5976 warning (OPT_Wmissing_braces
,
5977 "missing braces around initializer for %qT",
5981 /* Dispatch to specialized routines. */
5982 if (CLASS_TYPE_P (type
))
5983 return reshape_init_class (type
, d
, first_initializer_p
, complain
);
5984 else if (TREE_CODE (type
) == ARRAY_TYPE
)
5985 return reshape_init_array (type
, d
, complain
);
5986 else if (VECTOR_TYPE_P (type
))
5987 return reshape_init_vector (type
, d
, complain
);
5992 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
5993 brace-enclosed aggregate initializer.
5995 INIT is the CONSTRUCTOR containing the list of initializers describing
5996 a brace-enclosed initializer for an entity of the indicated aggregate TYPE.
5997 It may not presently match the shape of the TYPE; for example:
5999 struct S { int a; int b; };
6000 struct S a[] = { 1, 2, 3, 4 };
6002 Here INIT will hold a vector of four elements, rather than a
6003 vector of two elements, each itself a vector of two elements. This
6004 routine transforms INIT from the former form into the latter. The
6005 revised CONSTRUCTOR node is returned. */
6008 reshape_init (tree type
, tree init
, tsubst_flags_t complain
)
6010 vec
<constructor_elt
, va_gc
> *v
;
6014 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init
));
6016 v
= CONSTRUCTOR_ELTS (init
);
6018 /* An empty constructor does not need reshaping, and it is always a valid
6020 if (vec_safe_is_empty (v
))
6023 /* Handle [dcl.init.list] direct-list-initialization from
6024 single element of enumeration with a fixed underlying type. */
6025 if (is_direct_enum_init (type
, init
))
6027 tree elt
= CONSTRUCTOR_ELT (init
, 0)->value
;
6028 type
= cv_unqualified (type
);
6029 if (check_narrowing (ENUM_UNDERLYING_TYPE (type
), elt
, complain
))
6031 warning_sentinel
w (warn_useless_cast
);
6032 return cp_build_c_cast (type
, elt
, tf_warning_or_error
);
6035 return error_mark_node
;
6038 /* Recurse on this CONSTRUCTOR. */
6040 d
.end
= d
.cur
+ v
->length ();
6042 new_init
= reshape_init_r (type
, &d
, true, complain
);
6043 if (new_init
== error_mark_node
)
6044 return error_mark_node
;
6046 /* Make sure all the element of the constructor were used. Otherwise,
6047 issue an error about exceeding initializers. */
6050 if (complain
& tf_error
)
6051 error ("too many initializers for %qT", type
);
6052 return error_mark_node
;
6055 if (CONSTRUCTOR_IS_DIRECT_INIT (init
)
6056 && BRACE_ENCLOSED_INITIALIZER_P (new_init
))
6057 CONSTRUCTOR_IS_DIRECT_INIT (new_init
) = true;
6062 /* Verify array initializer. Returns true if errors have been reported. */
6065 check_array_initializer (tree decl
, tree type
, tree init
)
6067 tree element_type
= TREE_TYPE (type
);
6069 /* The array type itself need not be complete, because the
6070 initializer may tell us how many elements are in the array.
6071 But, the elements of the array must be complete. */
6072 if (!COMPLETE_TYPE_P (complete_type (element_type
)))
6075 error_at (DECL_SOURCE_LOCATION (decl
),
6076 "elements of array %q#D have incomplete type", decl
);
6078 error ("elements of array %q#T have incomplete type", type
);
6081 /* A compound literal can't have variable size. */
6083 && ((COMPLETE_TYPE_P (type
) && !TREE_CONSTANT (TYPE_SIZE (type
)))
6084 || !TREE_CONSTANT (TYPE_SIZE (element_type
))))
6086 error ("variable-sized compound literal");
6092 /* Subroutine of check_initializer; args are passed down from that function.
6093 Set stmts_are_full_exprs_p to 1 across a call to build_aggr_init. */
6096 build_aggr_init_full_exprs (tree decl
, tree init
, int flags
)
6099 gcc_assert (stmts_are_full_exprs_p ());
6100 return build_aggr_init (decl
, init
, flags
, tf_warning_or_error
);
6103 /* Verify INIT (the initializer for DECL), and record the
6104 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
6105 grok_reference_init.
6107 If the return value is non-NULL, it is an expression that must be
6108 evaluated dynamically to initialize DECL. */
6111 check_initializer (tree decl
, tree init
, int flags
, vec
<tree
, va_gc
> **cleanups
)
6113 tree type
= TREE_TYPE (decl
);
6114 tree init_code
= NULL
;
6117 /* Things that are going to be initialized need to have complete
6119 TREE_TYPE (decl
) = type
= complete_type (TREE_TYPE (decl
));
6121 if (DECL_HAS_VALUE_EXPR_P (decl
))
6123 /* A variable with DECL_HAS_VALUE_EXPR_P set is just a placeholder,
6124 it doesn't have storage to be initialized. */
6125 gcc_assert (init
== NULL_TREE
);
6129 if (type
== error_mark_node
)
6130 /* We will have already complained. */
6133 if (TREE_CODE (type
) == ARRAY_TYPE
)
6135 if (check_array_initializer (decl
, type
, init
))
6138 else if (!COMPLETE_TYPE_P (type
))
6140 error_at (DECL_SOURCE_LOCATION (decl
),
6141 "%q#D has incomplete type", decl
);
6142 TREE_TYPE (decl
) = error_mark_node
;
6146 /* There is no way to make a variable-sized class type in GNU C++. */
6147 gcc_assert (TREE_CONSTANT (TYPE_SIZE (type
)));
6149 if (init
&& BRACE_ENCLOSED_INITIALIZER_P (init
))
6151 int init_len
= CONSTRUCTOR_NELTS (init
);
6152 if (SCALAR_TYPE_P (type
))
6156 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS
);
6157 init
= build_zero_init (type
, NULL_TREE
, false);
6159 else if (init_len
!= 1 && TREE_CODE (type
) != COMPLEX_TYPE
)
6161 error_at (EXPR_LOC_OR_LOC (init
, DECL_SOURCE_LOCATION (decl
)),
6162 "scalar object %qD requires one element in "
6163 "initializer", decl
);
6164 TREE_TYPE (decl
) = error_mark_node
;
6170 if (TREE_CODE (decl
) == CONST_DECL
)
6172 gcc_assert (TREE_CODE (type
) != REFERENCE_TYPE
);
6174 DECL_INITIAL (decl
) = init
;
6176 gcc_assert (init
!= NULL_TREE
);
6179 else if (!init
&& DECL_REALLY_EXTERN (decl
))
6181 else if (init
|| type_build_ctor_call (type
)
6182 || TREE_CODE (type
) == REFERENCE_TYPE
)
6184 if (TREE_CODE (type
) == REFERENCE_TYPE
)
6186 init
= grok_reference_init (decl
, type
, init
, flags
);
6187 flags
|= LOOKUP_ALREADY_DIGESTED
;
6190 check_for_uninitialized_const_var (decl
);
6191 /* Do not reshape constructors of vectors (they don't need to be
6193 else if (BRACE_ENCLOSED_INITIALIZER_P (init
))
6195 if (is_std_init_list (type
))
6197 init
= perform_implicit_conversion (type
, init
,
6198 tf_warning_or_error
);
6199 flags
|= LOOKUP_ALREADY_DIGESTED
;
6201 else if (TYPE_NON_AGGREGATE_CLASS (type
))
6203 /* Don't reshape if the class has constructors. */
6204 if (cxx_dialect
== cxx98
)
6205 error_at (EXPR_LOC_OR_LOC (init
, DECL_SOURCE_LOCATION (decl
)),
6206 "in C++98 %qD must be initialized by "
6207 "constructor, not by %<{...}%>",
6210 else if (VECTOR_TYPE_P (type
) && TYPE_VECTOR_OPAQUE (type
))
6212 error ("opaque vector types cannot be initialized");
6213 init
= error_mark_node
;
6217 init
= reshape_init (type
, init
, tf_warning_or_error
);
6218 flags
|= LOOKUP_NO_NARROWING
;
6221 else if (TREE_CODE (init
) == TREE_LIST
6222 && TREE_TYPE (init
) != unknown_type_node
6223 && !MAYBE_CLASS_TYPE_P (type
))
6225 gcc_assert (TREE_CODE (decl
) != RESULT_DECL
);
6227 /* We get here with code like `int a (2);' */
6228 init
= build_x_compound_expr_from_list (init
, ELK_INIT
,
6229 tf_warning_or_error
);
6232 /* If DECL has an array type without a specific bound, deduce the
6233 array size from the initializer. */
6234 maybe_deduce_size_from_array_init (decl
, init
);
6235 type
= TREE_TYPE (decl
);
6236 if (type
== error_mark_node
)
6239 if (((type_build_ctor_call (type
) || CLASS_TYPE_P (type
))
6240 && !(flags
& LOOKUP_ALREADY_DIGESTED
)
6241 && !(init
&& BRACE_ENCLOSED_INITIALIZER_P (init
)
6242 && CP_AGGREGATE_TYPE_P (type
)
6243 && (CLASS_TYPE_P (type
)
6244 || !TYPE_NEEDS_CONSTRUCTING (type
)
6245 || type_has_extended_temps (type
))))
6246 || (DECL_DECOMPOSITION_P (decl
) && TREE_CODE (type
) == ARRAY_TYPE
))
6248 init_code
= build_aggr_init_full_exprs (decl
, init
, flags
);
6250 /* A constructor call is a non-trivial initializer even if
6251 it isn't explicitly written. */
6252 if (TREE_SIDE_EFFECTS (init_code
))
6253 DECL_NONTRIVIALLY_INITIALIZED_P (decl
) = true;
6255 /* If this is a constexpr initializer, expand_default_init will
6256 have returned an INIT_EXPR rather than a CALL_EXPR. In that
6257 case, pull the initializer back out and pass it down into
6258 store_init_value. */
6259 while (TREE_CODE (init_code
) == EXPR_STMT
6260 || TREE_CODE (init_code
) == CONVERT_EXPR
)
6261 init_code
= TREE_OPERAND (init_code
, 0);
6262 if (TREE_CODE (init_code
) == INIT_EXPR
)
6264 init
= TREE_OPERAND (init_code
, 1);
6265 init_code
= NULL_TREE
;
6266 /* Don't call digest_init; it's unnecessary and will complain
6267 about aggregate initialization of non-aggregate classes. */
6268 flags
|= LOOKUP_ALREADY_DIGESTED
;
6270 else if (DECL_DECLARED_CONSTEXPR_P (decl
))
6272 /* Declared constexpr, but no suitable initializer; massage
6273 init appropriately so we can pass it into store_init_value
6275 if (CLASS_TYPE_P (type
)
6276 && (!init
|| TREE_CODE (init
) == TREE_LIST
))
6278 init
= build_functional_cast (type
, init
, tf_none
);
6279 if (TREE_CODE (init
) == TARGET_EXPR
)
6280 TARGET_EXPR_DIRECT_INIT_P (init
) = true;
6282 init_code
= NULL_TREE
;
6288 if (init
&& TREE_CODE (init
) != TREE_VEC
)
6290 /* In aggregate initialization of a variable, each element
6291 initialization is a full-expression because there is no
6292 enclosing expression. */
6293 gcc_assert (stmts_are_full_exprs_p ());
6295 init_code
= store_init_value (decl
, init
, cleanups
, flags
);
6297 if (pedantic
&& TREE_CODE (type
) == ARRAY_TYPE
6298 && DECL_INITIAL (decl
)
6299 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
6300 && PAREN_STRING_LITERAL_P (DECL_INITIAL (decl
)))
6301 warning_at (EXPR_LOC_OR_LOC (DECL_INITIAL (decl
),
6302 DECL_SOURCE_LOCATION (decl
)),
6303 0, "array %qD initialized by parenthesized "
6304 "string literal %qE",
6305 decl
, DECL_INITIAL (decl
));
6311 if (CLASS_TYPE_P (core_type
= strip_array_types (type
))
6312 && (CLASSTYPE_READONLY_FIELDS_NEED_INIT (core_type
)
6313 || CLASSTYPE_REF_FIELDS_NEED_INIT (core_type
)))
6314 diagnose_uninitialized_cst_or_ref_member (core_type
, /*using_new=*/false,
6317 check_for_uninitialized_const_var (decl
);
6320 if (init
&& init
!= error_mark_node
)
6321 init_code
= build2 (INIT_EXPR
, type
, decl
, init
);
6325 /* We might have set these in cp_finish_decl. */
6326 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl
) = false;
6327 TREE_CONSTANT (decl
) = false;
6331 && (DECL_IN_AGGR_P (decl
) && !DECL_VAR_DECLARED_INLINE_P (decl
)))
6333 static int explained
= 0;
6335 if (cxx_dialect
< cxx11
)
6336 error ("initializer invalid for static member with constructor");
6337 else if (cxx_dialect
< cxx17
)
6338 error ("non-constant in-class initialization invalid for static "
6339 "member %qD", decl
);
6341 error ("non-constant in-class initialization invalid for non-inline "
6342 "static member %qD", decl
);
6345 inform (input_location
,
6346 "(an out of class initialization is required)");
6355 /* If DECL is not a local variable, give it RTL. */
6358 make_rtl_for_nonlocal_decl (tree decl
, tree init
, const char* asmspec
)
6360 int toplev
= toplevel_bindings_p ();
6363 /* Set the DECL_ASSEMBLER_NAME for the object. */
6366 /* The `register' keyword, when used together with an
6367 asm-specification, indicates that the variable should be
6368 placed in a particular register. */
6369 if (VAR_P (decl
) && DECL_REGISTER (decl
))
6371 set_user_assembler_name (decl
, asmspec
);
6372 DECL_HARD_REGISTER (decl
) = 1;
6376 if (TREE_CODE (decl
) == FUNCTION_DECL
6377 && DECL_BUILT_IN_CLASS (decl
) == BUILT_IN_NORMAL
)
6378 set_builtin_user_assembler_name (decl
, asmspec
);
6379 set_user_assembler_name (decl
, asmspec
);
6383 /* Handle non-variables up front. */
6386 rest_of_decl_compilation (decl
, toplev
, at_eof
);
6390 /* If we see a class member here, it should be a static data
6392 if (DECL_LANG_SPECIFIC (decl
) && DECL_IN_AGGR_P (decl
))
6394 gcc_assert (TREE_STATIC (decl
));
6395 /* An in-class declaration of a static data member should be
6396 external; it is only a declaration, and not a definition. */
6397 if (init
== NULL_TREE
)
6398 gcc_assert (DECL_EXTERNAL (decl
)
6399 || !TREE_PUBLIC (decl
)
6400 || DECL_INLINE_VAR_P (decl
));
6403 /* We don't create any RTL for local variables. */
6404 if (DECL_FUNCTION_SCOPE_P (decl
) && !TREE_STATIC (decl
))
6407 /* We defer emission of local statics until the corresponding
6408 DECL_EXPR is expanded. But with constexpr its function might never
6409 be expanded, so go ahead and tell cgraph about the variable now. */
6410 defer_p
= ((DECL_FUNCTION_SCOPE_P (decl
)
6411 && !var_in_maybe_constexpr_fn (decl
))
6412 || DECL_VIRTUAL_P (decl
));
6414 /* Defer template instantiations. */
6415 if (DECL_LANG_SPECIFIC (decl
)
6416 && DECL_IMPLICIT_INSTANTIATION (decl
))
6419 /* If we're not deferring, go ahead and assemble the variable. */
6421 rest_of_decl_compilation (decl
, toplev
, at_eof
);
6424 /* walk_tree helper for wrap_temporary_cleanups, below. */
6427 wrap_cleanups_r (tree
*stmt_p
, int *walk_subtrees
, void *data
)
6429 /* Stop at types or full-expression boundaries. */
6430 if (TYPE_P (*stmt_p
)
6431 || TREE_CODE (*stmt_p
) == CLEANUP_POINT_EXPR
)
6437 if (TREE_CODE (*stmt_p
) == TARGET_EXPR
)
6439 tree guard
= (tree
)data
;
6440 tree tcleanup
= TARGET_EXPR_CLEANUP (*stmt_p
);
6442 tcleanup
= build2 (TRY_CATCH_EXPR
, void_type_node
, tcleanup
, guard
);
6443 /* Tell honor_protect_cleanup_actions to handle this as a separate
6445 TRY_CATCH_IS_CLEANUP (tcleanup
) = 1;
6447 TARGET_EXPR_CLEANUP (*stmt_p
) = tcleanup
;
6453 /* We're initializing a local variable which has a cleanup GUARD. If there
6454 are any temporaries used in the initializer INIT of this variable, we
6455 need to wrap their cleanups with TRY_CATCH_EXPR (, GUARD) so that the
6456 variable will be cleaned up properly if one of them throws.
6458 Unfortunately, there's no way to express this properly in terms of
6459 nesting, as the regions for the temporaries overlap the region for the
6460 variable itself; if there are two temporaries, the variable needs to be
6461 the first thing destroyed if either of them throws. However, we only
6462 want to run the variable's cleanup if it actually got constructed. So
6463 we need to guard the temporary cleanups with the variable's cleanup if
6464 they are run on the normal path, but not if they are run on the
6465 exceptional path. We implement this by telling
6466 honor_protect_cleanup_actions to strip the variable cleanup from the
6467 exceptional path. */
6470 wrap_temporary_cleanups (tree init
, tree guard
)
6472 cp_walk_tree_without_duplicates (&init
, wrap_cleanups_r
, (void *)guard
);
6475 /* Generate code to initialize DECL (a local variable). */
6478 initialize_local_var (tree decl
, tree init
)
6480 tree type
= TREE_TYPE (decl
);
6484 gcc_assert (VAR_P (decl
)
6485 || TREE_CODE (decl
) == RESULT_DECL
);
6486 gcc_assert (!TREE_STATIC (decl
));
6488 if (DECL_SIZE (decl
) == NULL_TREE
)
6490 /* If we used it already as memory, it must stay in memory. */
6491 DECL_INITIAL (decl
) = NULL_TREE
;
6492 TREE_ADDRESSABLE (decl
) = TREE_USED (decl
);
6496 if (type
== error_mark_node
)
6499 /* Compute and store the initial value. */
6500 already_used
= TREE_USED (decl
) || TREE_USED (type
);
6501 if (TREE_USED (type
))
6502 DECL_READ_P (decl
) = 1;
6504 /* Generate a cleanup, if necessary. */
6505 cleanup
= cxx_maybe_build_cleanup (decl
, tf_warning_or_error
);
6507 /* Perform the initialization. */
6510 tree rinit
= (TREE_CODE (init
) == INIT_EXPR
6511 ? TREE_OPERAND (init
, 1) : NULL_TREE
);
6512 if (rinit
&& !TREE_SIDE_EFFECTS (rinit
))
6514 /* Stick simple initializers in DECL_INITIAL so that
6515 -Wno-init-self works (c++/34772). */
6516 gcc_assert (TREE_OPERAND (init
, 0) == decl
);
6517 DECL_INITIAL (decl
) = rinit
;
6519 if (warn_init_self
&& TREE_CODE (type
) == REFERENCE_TYPE
)
6523 warning_at (DECL_SOURCE_LOCATION (decl
),
6525 "reference %qD is initialized with itself", decl
);
6530 int saved_stmts_are_full_exprs_p
;
6532 /* If we're only initializing a single object, guard the
6533 destructors of any temporaries used in its initializer with
6534 its destructor. This isn't right for arrays because each
6535 element initialization is a full-expression. */
6536 if (cleanup
&& TREE_CODE (type
) != ARRAY_TYPE
)
6537 wrap_temporary_cleanups (init
, cleanup
);
6539 gcc_assert (building_stmt_list_p ());
6540 saved_stmts_are_full_exprs_p
= stmts_are_full_exprs_p ();
6541 current_stmt_tree ()->stmts_are_full_exprs_p
= 1;
6542 finish_expr_stmt (init
);
6543 current_stmt_tree ()->stmts_are_full_exprs_p
=
6544 saved_stmts_are_full_exprs_p
;
6548 /* Set this to 0 so we can tell whether an aggregate which was
6549 initialized was ever used. Don't do this if it has a
6550 destructor, so we don't complain about the 'resource
6551 allocation is initialization' idiom. Now set
6552 attribute((unused)) on types so decls of that type will be
6553 marked used. (see TREE_USED, above.) */
6554 if (TYPE_NEEDS_CONSTRUCTING (type
)
6556 && TYPE_HAS_TRIVIAL_DESTRUCTOR (type
)
6557 && DECL_NAME (decl
))
6558 TREE_USED (decl
) = 0;
6559 else if (already_used
)
6560 TREE_USED (decl
) = 1;
6563 finish_decl_cleanup (decl
, cleanup
);
6566 /* DECL is a VAR_DECL for a compiler-generated variable with static
6567 storage duration (like a virtual table) whose initializer is a
6568 compile-time constant. Initialize the variable and provide it to the
6572 initialize_artificial_var (tree decl
, vec
<constructor_elt
, va_gc
> *v
)
6575 gcc_assert (DECL_ARTIFICIAL (decl
));
6576 init
= build_constructor (TREE_TYPE (decl
), v
);
6577 gcc_assert (TREE_CODE (init
) == CONSTRUCTOR
);
6578 DECL_INITIAL (decl
) = init
;
6579 DECL_INITIALIZED_P (decl
) = 1;
6580 determine_visibility (decl
);
6581 layout_var_decl (decl
);
6582 maybe_commonize_var (decl
);
6583 make_rtl_for_nonlocal_decl (decl
, init
, /*asmspec=*/NULL
);
6586 /* INIT is the initializer for a variable, as represented by the
6587 parser. Returns true iff INIT is type-dependent. */
6590 type_dependent_init_p (tree init
)
6592 if (TREE_CODE (init
) == TREE_LIST
)
6593 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
6594 return any_type_dependent_elements_p (init
);
6595 else if (TREE_CODE (init
) == CONSTRUCTOR
)
6596 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
6598 if (dependent_type_p (TREE_TYPE (init
)))
6601 vec
<constructor_elt
, va_gc
> *elts
;
6605 elts
= CONSTRUCTOR_ELTS (init
);
6606 nelts
= vec_safe_length (elts
);
6607 for (i
= 0; i
< nelts
; ++i
)
6608 if (type_dependent_init_p ((*elts
)[i
].value
))
6612 /* It must be a simple expression, e.g., int i = 3; */
6613 return type_dependent_expression_p (init
);
6618 /* INIT is the initializer for a variable, as represented by the
6619 parser. Returns true iff INIT is value-dependent. */
6622 value_dependent_init_p (tree init
)
6624 if (TREE_CODE (init
) == TREE_LIST
)
6625 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
6626 return any_value_dependent_elements_p (init
);
6627 else if (TREE_CODE (init
) == CONSTRUCTOR
)
6628 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
6630 vec
<constructor_elt
, va_gc
> *elts
;
6634 elts
= CONSTRUCTOR_ELTS (init
);
6635 nelts
= vec_safe_length (elts
);
6636 for (i
= 0; i
< nelts
; ++i
)
6637 if (value_dependent_init_p ((*elts
)[i
].value
))
6641 /* It must be a simple expression, e.g., int i = 3; */
6642 return value_dependent_expression_p (init
);
6647 // Returns true if a DECL is VAR_DECL with the concept specifier.
6649 is_concept_var (tree decl
)
6651 return (VAR_P (decl
)
6652 // Not all variables have DECL_LANG_SPECIFIC.
6653 && DECL_LANG_SPECIFIC (decl
)
6654 && DECL_DECLARED_CONCEPT_P (decl
));
6657 /* A helper function to be called via walk_tree. If any label exists
6658 under *TP, it is (going to be) forced. Set has_forced_label_in_static. */
6661 notice_forced_label_r (tree
*tp
, int *walk_subtrees
, void *)
6665 if (TREE_CODE (*tp
) == LABEL_DECL
)
6666 cfun
->has_forced_label_in_static
= 1;
6670 /* Finish processing of a declaration;
6671 install its line number and initial value.
6672 If the length of an array type is not known before,
6673 it must be determined now, from the initial value, or it is an error.
6675 INIT is the initializer (if any) for DECL. If INIT_CONST_EXPR_P is
6676 true, then INIT is an integral constant expression.
6678 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
6679 if the (init) syntax was used. */
6682 cp_finish_decl (tree decl
, tree init
, bool init_const_expr_p
,
6683 tree asmspec_tree
, int flags
)
6686 vec
<tree
, va_gc
> *cleanups
= NULL
;
6687 const char *asmspec
= NULL
;
6688 int was_readonly
= 0;
6689 bool var_definition_p
= false;
6692 if (decl
== error_mark_node
)
6697 error ("assignment (not initialization) in declaration");
6701 gcc_assert (TREE_CODE (decl
) != RESULT_DECL
);
6702 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
6703 gcc_assert (TREE_CODE (decl
) != PARM_DECL
);
6705 type
= TREE_TYPE (decl
);
6706 if (type
== error_mark_node
)
6709 /* Warn about register storage specifiers except when in GNU global
6710 or local register variable extension. */
6711 if (VAR_P (decl
) && DECL_REGISTER (decl
) && asmspec_tree
== NULL_TREE
)
6713 if (cxx_dialect
>= cxx17
)
6714 pedwarn (DECL_SOURCE_LOCATION (decl
), OPT_Wregister
,
6715 "ISO C++17 does not allow %<register%> storage "
6718 warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wregister
,
6719 "%<register%> storage class specifier used");
6722 /* If a name was specified, get the string. */
6723 if (at_namespace_scope_p ())
6724 asmspec_tree
= maybe_apply_renaming_pragma (decl
, asmspec_tree
);
6725 if (asmspec_tree
&& asmspec_tree
!= error_mark_node
)
6726 asmspec
= TREE_STRING_POINTER (asmspec_tree
);
6728 if (current_class_type
6729 && CP_DECL_CONTEXT (decl
) == current_class_type
6730 && TYPE_BEING_DEFINED (current_class_type
)
6731 && !CLASSTYPE_TEMPLATE_INSTANTIATION (current_class_type
)
6732 && (DECL_INITIAL (decl
) || init
))
6733 DECL_INITIALIZED_IN_CLASS_P (decl
) = 1;
6735 if (TREE_CODE (decl
) != FUNCTION_DECL
6736 && (auto_node
= type_uses_auto (type
)))
6739 if (init
== NULL_TREE
)
6741 if (DECL_LANG_SPECIFIC (decl
)
6742 && DECL_TEMPLATE_INSTANTIATION (decl
)
6743 && !DECL_TEMPLATE_INSTANTIATED (decl
))
6745 /* init is null because we're deferring instantiating the
6746 initializer until we need it. Well, we need it now. */
6747 instantiate_decl (decl
, /*defer_ok*/true, /*expl*/false);
6751 gcc_assert (CLASS_PLACEHOLDER_TEMPLATE (auto_node
));
6756 if (TREE_CODE (d_init
) == TREE_LIST
6757 && !CLASS_PLACEHOLDER_TEMPLATE (auto_node
))
6758 d_init
= build_x_compound_expr_from_list (d_init
, ELK_INIT
,
6759 tf_warning_or_error
);
6760 d_init
= resolve_nondeduced_context (d_init
, tf_warning_or_error
);
6762 enum auto_deduction_context adc
= adc_variable_type
;
6763 if (VAR_P (decl
) && DECL_DECOMPOSITION_P (decl
))
6764 adc
= adc_decomp_type
;
6765 type
= TREE_TYPE (decl
) = do_auto_deduction (type
, d_init
, auto_node
,
6766 tf_warning_or_error
, adc
,
6768 if (type
== error_mark_node
)
6770 if (TREE_CODE (type
) == FUNCTION_TYPE
)
6772 error ("initializer for %<decltype(auto) %D%> has function type "
6773 "(did you forget the %<()%> ?)", decl
);
6774 TREE_TYPE (decl
) = error_mark_node
;
6777 cp_apply_type_quals_to_decl (cp_type_quals (type
), decl
);
6780 if (!ensure_literal_type_for_constexpr_object (decl
))
6781 DECL_DECLARED_CONSTEXPR_P (decl
) = 0;
6784 && DECL_CLASS_SCOPE_P (decl
)
6785 && DECL_INITIALIZED_IN_CLASS_P (decl
))
6786 check_static_variable_definition (decl
, type
);
6788 if (init
&& TREE_CODE (decl
) == FUNCTION_DECL
)
6791 if (init
== ridpointers
[(int)RID_DELETE
])
6793 /* FIXME check this is 1st decl. */
6794 DECL_DELETED_FN (decl
) = 1;
6795 DECL_DECLARED_INLINE_P (decl
) = 1;
6796 DECL_INITIAL (decl
) = error_mark_node
;
6797 FOR_EACH_CLONE (clone
, decl
)
6799 DECL_DELETED_FN (clone
) = 1;
6800 DECL_DECLARED_INLINE_P (clone
) = 1;
6801 DECL_INITIAL (clone
) = error_mark_node
;
6805 else if (init
== ridpointers
[(int)RID_DEFAULT
])
6807 if (defaultable_fn_check (decl
))
6808 DECL_DEFAULTED_FN (decl
) = 1;
6810 DECL_INITIAL (decl
) = NULL_TREE
;
6814 if (init
&& VAR_P (decl
))
6816 DECL_NONTRIVIALLY_INITIALIZED_P (decl
) = 1;
6817 /* If DECL is a reference, then we want to know whether init is a
6818 reference constant; init_const_expr_p as passed tells us whether
6819 it's an rvalue constant. */
6820 if (TREE_CODE (type
) == REFERENCE_TYPE
)
6821 init_const_expr_p
= potential_constant_expression (init
);
6822 if (init_const_expr_p
)
6824 /* Set these flags now for templates. We'll update the flags in
6825 store_init_value for instantiations. */
6826 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl
) = 1;
6827 if (decl_maybe_constant_var_p (decl
)
6828 /* FIXME setting TREE_CONSTANT on refs breaks the back end. */
6829 && TREE_CODE (type
) != REFERENCE_TYPE
)
6830 TREE_CONSTANT (decl
) = 1;
6834 if (processing_template_decl
)
6836 bool type_dependent_p
;
6838 /* Add this declaration to the statement-tree. */
6839 if (at_function_scope_p ())
6840 add_decl_expr (decl
);
6842 type_dependent_p
= dependent_type_p (type
);
6844 if (check_for_bare_parameter_packs (init
))
6847 DECL_INITIAL (decl
) = NULL_TREE
;
6850 init
= do_dependent_capture (init
);
6852 /* Generally, initializers in templates are expanded when the
6853 template is instantiated. But, if DECL is a variable constant
6854 then it can be used in future constant expressions, so its value
6855 must be available. */
6857 if (!VAR_P (decl
) || type_dependent_p
)
6858 /* We can't do anything if the decl has dependent type. */;
6860 && init_const_expr_p
6861 && TREE_CODE (type
) != REFERENCE_TYPE
6862 && decl_maybe_constant_var_p (decl
)
6863 && !type_dependent_init_p (init
)
6864 && !value_dependent_init_p (init
))
6866 /* This variable seems to be a non-dependent constant, so process
6867 its initializer. If check_initializer returns non-null the
6868 initialization wasn't constant after all. */
6870 cleanups
= make_tree_vector ();
6871 init_code
= check_initializer (decl
, init
, flags
, &cleanups
);
6872 if (init_code
== NULL_TREE
)
6874 release_tree_vector (cleanups
);
6876 else if (!init
&& is_concept_var (decl
))
6877 error ("variable concept has no initializer");
6878 else if (!DECL_PRETTY_FUNCTION_P (decl
))
6880 /* Deduce array size even if the initializer is dependent. */
6881 maybe_deduce_size_from_array_init (decl
, init
);
6882 /* And complain about multiple initializers. */
6883 if (init
&& TREE_CODE (init
) == TREE_LIST
&& TREE_CHAIN (init
)
6884 && !MAYBE_CLASS_TYPE_P (type
))
6885 init
= build_x_compound_expr_from_list (init
, ELK_INIT
,
6886 tf_warning_or_error
);
6890 DECL_INITIAL (decl
) = init
;
6894 /* Just store non-static data member initializers for later. */
6895 if (init
&& TREE_CODE (decl
) == FIELD_DECL
)
6896 DECL_INITIAL (decl
) = init
;
6898 /* Take care of TYPE_DECLs up front. */
6899 if (TREE_CODE (decl
) == TYPE_DECL
)
6901 if (type
!= error_mark_node
6902 && MAYBE_CLASS_TYPE_P (type
) && DECL_NAME (decl
))
6904 if (TREE_TYPE (DECL_NAME (decl
)) && TREE_TYPE (decl
) != type
)
6905 warning (0, "shadowing previous type declaration of %q#D", decl
);
6906 set_identifier_type_value (DECL_NAME (decl
), decl
);
6909 /* If we have installed this as the canonical typedef for this
6910 type, and that type has not been defined yet, delay emitting
6911 the debug information for it, as we will emit it later. */
6912 if (TYPE_MAIN_DECL (TREE_TYPE (decl
)) == decl
6913 && !COMPLETE_TYPE_P (TREE_TYPE (decl
)))
6914 TYPE_DECL_SUPPRESS_DEBUG (decl
) = 1;
6916 rest_of_decl_compilation (decl
, DECL_FILE_SCOPE_P (decl
),
6921 /* A reference will be modified here, as it is initialized. */
6922 if (! DECL_EXTERNAL (decl
)
6923 && TREE_READONLY (decl
)
6924 && TREE_CODE (type
) == REFERENCE_TYPE
)
6927 TREE_READONLY (decl
) = 0;
6932 /* If this is a local variable that will need a mangled name,
6933 register it now. We must do this before processing the
6934 initializer for the variable, since the initialization might
6935 require a guard variable, and since the mangled name of the
6936 guard variable will depend on the mangled name of this
6938 if (DECL_FUNCTION_SCOPE_P (decl
)
6939 && TREE_STATIC (decl
)
6940 && !DECL_ARTIFICIAL (decl
))
6942 push_local_name (decl
);
6943 /* Normally has_forced_label_in_static is set during GIMPLE
6944 lowering, but [cd]tors are never actually compiled directly.
6945 We need to set this early so we can deal with the label
6946 address extension. */
6947 if ((DECL_CONSTRUCTOR_P (current_function_decl
)
6948 || DECL_DESTRUCTOR_P (current_function_decl
))
6951 walk_tree (&init
, notice_forced_label_r
, NULL
, NULL
);
6952 add_local_decl (cfun
, decl
);
6954 /* And make sure it's in the symbol table for
6955 c_parse_final_cleanups to find. */
6956 varpool_node::get_create (decl
);
6959 /* Convert the initializer to the type of DECL, if we have not
6960 already initialized DECL. */
6961 if (!DECL_INITIALIZED_P (decl
)
6962 /* If !DECL_EXTERNAL then DECL is being defined. In the
6963 case of a static data member initialized inside the
6964 class-specifier, there can be an initializer even if DECL
6965 is *not* defined. */
6966 && (!DECL_EXTERNAL (decl
) || init
))
6968 cleanups
= make_tree_vector ();
6969 init
= check_initializer (decl
, init
, flags
, &cleanups
);
6975 The memory occupied by any object of static storage
6976 duration is zero-initialized at program startup before
6977 any other initialization takes place.
6979 We cannot create an appropriate initializer until after
6980 the type of DECL is finalized. If DECL_INITIAL is set,
6981 then the DECL is statically initialized, and any
6982 necessary zero-initialization has already been performed. */
6983 if (TREE_STATIC (decl
) && !DECL_INITIAL (decl
))
6984 DECL_INITIAL (decl
) = build_zero_init (TREE_TYPE (decl
),
6985 /*nelts=*/NULL_TREE
,
6986 /*static_storage_p=*/true);
6987 /* Remember that the initialization for this variable has
6989 DECL_INITIALIZED_P (decl
) = 1;
6990 /* This declaration is the definition of this variable,
6991 unless we are initializing a static data member within
6992 the class specifier. */
6993 if (!DECL_EXTERNAL (decl
))
6994 var_definition_p
= true;
6996 /* If the variable has an array type, lay out the type, even if
6997 there is no initializer. It is valid to index through the
6998 array, and we must get TYPE_ALIGN set correctly on the array
7000 else if (TREE_CODE (type
) == ARRAY_TYPE
)
7003 if (TREE_STATIC (decl
)
7004 && !at_function_scope_p ()
7005 && current_function_decl
== NULL
)
7006 /* So decl is a global variable or a static member of a
7007 non local class. Record the types it uses
7008 so that we can decide later to emit debug info for them. */
7009 record_types_used_by_current_var_decl (decl
);
7012 /* Add this declaration to the statement-tree. This needs to happen
7013 after the call to check_initializer so that the DECL_EXPR for a
7014 reference temp is added before the DECL_EXPR for the reference itself. */
7015 if (DECL_FUNCTION_SCOPE_P (decl
))
7017 /* If we're building a variable sized type, and we might be
7018 reachable other than via the top of the current binding
7019 level, then create a new BIND_EXPR so that we deallocate
7020 the object at the right time. */
7023 && !TREE_CONSTANT (DECL_SIZE (decl
))
7024 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list
))
7027 bind
= build3 (BIND_EXPR
, void_type_node
, NULL
, NULL
, NULL
);
7028 TREE_SIDE_EFFECTS (bind
) = 1;
7030 BIND_EXPR_BODY (bind
) = push_stmt_list ();
7032 add_decl_expr (decl
);
7035 /* Let the middle end know about variables and functions -- but not
7036 static data members in uninstantiated class templates. */
7037 if (VAR_OR_FUNCTION_DECL_P (decl
))
7041 layout_var_decl (decl
);
7042 maybe_commonize_var (decl
);
7045 /* This needs to happen after the linkage is set. */
7046 determine_visibility (decl
);
7048 if (var_definition_p
&& TREE_STATIC (decl
))
7050 /* If a TREE_READONLY variable needs initialization
7051 at runtime, it is no longer readonly and we need to
7052 avoid MEM_READONLY_P being set on RTL created for it. */
7055 if (TREE_READONLY (decl
))
7056 TREE_READONLY (decl
) = 0;
7059 else if (was_readonly
)
7060 TREE_READONLY (decl
) = 1;
7062 /* Likewise if it needs destruction. */
7063 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type
))
7064 TREE_READONLY (decl
) = 0;
7067 make_rtl_for_nonlocal_decl (decl
, init
, asmspec
);
7069 /* Check for abstractness of the type. Notice that there is no
7070 need to strip array types here since the check for those types
7071 is already done within create_array_type_for_decl. */
7072 abstract_virtuals_error (decl
, type
);
7074 if (TREE_TYPE (decl
) == error_mark_node
)
7075 /* No initialization required. */
7077 else if (TREE_CODE (decl
) == FUNCTION_DECL
)
7081 if (init
== ridpointers
[(int)RID_DEFAULT
])
7083 /* An out-of-class default definition is defined at
7084 the point where it is explicitly defaulted. */
7085 if (DECL_DELETED_FN (decl
))
7086 maybe_explain_implicit_delete (decl
);
7087 else if (DECL_INITIAL (decl
) == error_mark_node
)
7088 synthesize_method (decl
);
7091 error ("function %q#D is initialized like a variable", decl
);
7093 /* else no initialization required. */
7095 else if (DECL_EXTERNAL (decl
)
7096 && ! (DECL_LANG_SPECIFIC (decl
)
7097 && DECL_NOT_REALLY_EXTERN (decl
)))
7100 DECL_INITIAL (decl
) = init
;
7102 /* A variable definition. */
7103 else if (DECL_FUNCTION_SCOPE_P (decl
) && !TREE_STATIC (decl
))
7104 /* Initialize the local variable. */
7105 initialize_local_var (decl
, init
);
7107 /* If a variable is defined, and then a subsequent
7108 definition with external linkage is encountered, we will
7109 get here twice for the same variable. We want to avoid
7110 calling expand_static_init more than once. For variables
7111 that are not static data members, we can call
7112 expand_static_init only when we actually process the
7113 initializer. It is not legal to redeclare a static data
7114 member, so this issue does not arise in that case. */
7115 else if (var_definition_p
&& TREE_STATIC (decl
))
7116 expand_static_init (decl
, init
);
7119 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
7120 reference, insert it in the statement-tree now. */
7124 FOR_EACH_VEC_ELT (*cleanups
, i
, t
)
7125 push_cleanup (decl
, t
, false);
7126 release_tree_vector (cleanups
);
7130 TREE_READONLY (decl
) = 1;
7132 invoke_plugin_callbacks (PLUGIN_FINISH_DECL
, decl
);
7135 /* For class TYPE return itself or some its bases that contain
7136 any direct non-static data members. Return error_mark_node if an
7137 error has been diagnosed. */
7140 find_decomp_class_base (location_t loc
, tree type
, tree ret
)
7142 bool member_seen
= false;
7143 for (tree field
= TYPE_FIELDS (type
); field
; field
= DECL_CHAIN (field
))
7144 if (TREE_CODE (field
) != FIELD_DECL
|| DECL_ARTIFICIAL (field
))
7148 else if (ANON_AGGR_TYPE_P (TREE_TYPE (field
)))
7150 if (TREE_CODE (TREE_TYPE (field
)) == RECORD_TYPE
)
7151 error_at (loc
, "cannot decompose class type %qT because it has an "
7152 "anonymous struct member", type
);
7154 error_at (loc
, "cannot decompose class type %qT because it has an "
7155 "anonymous union member", type
);
7156 inform (DECL_SOURCE_LOCATION (field
), "declared here");
7157 return error_mark_node
;
7159 else if (TREE_PRIVATE (field
) || TREE_PROTECTED (field
))
7161 error_at (loc
, "cannot decompose non-public member %qD of %qT",
7163 inform (DECL_SOURCE_LOCATION (field
),
7164 TREE_PRIVATE (field
)
7165 ? G_("declared private here")
7166 : G_("declared protected here"));
7167 return error_mark_node
;
7172 tree base_binfo
, binfo
;
7173 tree orig_ret
= ret
;
7177 for (binfo
= TYPE_BINFO (type
), i
= 0;
7178 BINFO_BASE_ITERATE (binfo
, i
, base_binfo
); i
++)
7180 tree t
= find_decomp_class_base (loc
, TREE_TYPE (base_binfo
), ret
);
7181 if (t
== error_mark_node
)
7182 return error_mark_node
;
7187 error_at (loc
, "cannot decompose class type %qT: both it and "
7188 "its base class %qT have non-static data members",
7190 return error_mark_node
;
7192 else if (orig_ret
!= NULL_TREE
)
7195 /* OK, found the same base along another path. We'll complain
7196 in convert_to_base if it's ambiguous. */;
7197 else if (ret
!= NULL_TREE
)
7199 error_at (loc
, "cannot decompose class type %qT: its base "
7200 "classes %qT and %qT have non-static data "
7201 "members", type
, ret
, t
);
7202 return error_mark_node
;
7211 /* Return std::tuple_size<TYPE>::value. */
7214 get_tuple_size (tree type
)
7216 tree args
= make_tree_vec (1);
7217 TREE_VEC_ELT (args
, 0) = type
;
7218 tree inst
= lookup_template_class (get_identifier ("tuple_size"), args
,
7219 /*in_decl*/NULL_TREE
,
7220 /*context*/std_node
,
7221 /*entering_scope*/false, tf_none
);
7222 inst
= complete_type (inst
);
7223 if (inst
== error_mark_node
|| !COMPLETE_TYPE_P (inst
))
7225 tree val
= lookup_qualified_name (inst
, get_identifier ("value"),
7226 /*type*/false, /*complain*/false);
7227 if (TREE_CODE (val
) == VAR_DECL
|| TREE_CODE (val
) == CONST_DECL
)
7228 val
= maybe_constant_value (val
);
7229 if (TREE_CODE (val
) == INTEGER_CST
)
7232 return error_mark_node
;
7235 /* Return std::tuple_element<I,TYPE>::type. */
7238 get_tuple_element_type (tree type
, unsigned i
)
7240 tree args
= make_tree_vec (2);
7241 TREE_VEC_ELT (args
, 0) = build_int_cst (integer_type_node
, i
);
7242 TREE_VEC_ELT (args
, 1) = type
;
7243 tree inst
= lookup_template_class (get_identifier ("tuple_element"), args
,
7244 /*in_decl*/NULL_TREE
,
7245 /*context*/std_node
,
7246 /*entering_scope*/false,
7247 tf_warning_or_error
);
7248 return make_typename_type (inst
, get_identifier ("type"),
7249 none_type
, tf_warning_or_error
);
7252 /* Return e.get<i>() or get<i>(e). */
7255 get_tuple_decomp_init (tree decl
, unsigned i
)
7257 tree get_id
= get_identifier ("get");
7258 tree targs
= make_tree_vec (1);
7259 TREE_VEC_ELT (targs
, 0) = build_int_cst (integer_type_node
, i
);
7261 tree etype
= TREE_TYPE (decl
);
7262 tree e
= convert_from_reference (decl
);
7264 /* [The id-expression] e is an lvalue if the type of the entity e is an
7265 lvalue reference and an xvalue otherwise. */
7266 if (TREE_CODE (etype
) != REFERENCE_TYPE
7267 || TYPE_REF_IS_RVALUE (etype
))
7270 tree fns
= lookup_qualified_name (TREE_TYPE (e
), get_id
,
7271 /*type*/false, /*complain*/false);
7272 if (fns
!= error_mark_node
)
7274 fns
= lookup_template_function (fns
, targs
);
7275 return build_new_method_call (e
, fns
, /*args*/NULL
,
7276 /*path*/NULL_TREE
, LOOKUP_NORMAL
,
7277 /*fn_p*/NULL
, tf_warning_or_error
);
7281 vec
<tree
,va_gc
> *args
= make_tree_vector_single (e
);
7282 fns
= lookup_template_function (get_id
, targs
);
7283 fns
= perform_koenig_lookup (fns
, args
, tf_warning_or_error
);
7284 return finish_call_expr (fns
, &args
, /*novirt*/false,
7285 /*koenig*/true, tf_warning_or_error
);
7289 /* It's impossible to recover the decltype of a tuple decomposition variable
7290 based on the actual type of the variable, so store it in a hash table. */
7291 static GTY(()) hash_map
<tree
,tree
> *decomp_type_table
;
7293 store_decomp_type (tree v
, tree t
)
7295 if (!decomp_type_table
)
7296 decomp_type_table
= hash_map
<tree
,tree
>::create_ggc (13);
7297 decomp_type_table
->put (v
, t
);
7301 lookup_decomp_type (tree v
)
7303 return *decomp_type_table
->get (v
);
7306 /* Finish a decomposition declaration. DECL is the underlying declaration
7307 "e", FIRST is the head of a chain of decls for the individual identifiers
7308 chained through DECL_CHAIN in reverse order and COUNT is the number of
7312 cp_finish_decomp (tree decl
, tree first
, unsigned int count
)
7314 if (error_operand_p (decl
))
7319 TREE_TYPE (first
) = error_mark_node
;
7320 if (DECL_HAS_VALUE_EXPR_P (first
))
7322 SET_DECL_VALUE_EXPR (first
, NULL_TREE
);
7323 DECL_HAS_VALUE_EXPR_P (first
) = 0;
7325 first
= DECL_CHAIN (first
);
7327 if (DECL_P (decl
) && DECL_NAMESPACE_SCOPE_P (decl
))
7328 SET_DECL_ASSEMBLER_NAME (decl
, get_identifier ("<decomp>"));
7332 location_t loc
= DECL_SOURCE_LOCATION (decl
);
7333 if (type_dependent_expression_p (decl
)
7334 /* This happens for range for when not in templates.
7335 Still add the DECL_VALUE_EXPRs for later processing. */
7336 || (!processing_template_decl
7337 && type_uses_auto (TREE_TYPE (decl
))))
7339 for (unsigned int i
= 0; i
< count
; i
++)
7341 if (!DECL_HAS_VALUE_EXPR_P (first
))
7343 tree v
= build_nt (ARRAY_REF
, decl
,
7344 size_int (count
- i
- 1),
7345 NULL_TREE
, NULL_TREE
);
7346 SET_DECL_VALUE_EXPR (first
, v
);
7347 DECL_HAS_VALUE_EXPR_P (first
) = 1;
7349 if (processing_template_decl
)
7350 fit_decomposition_lang_decl (first
, decl
);
7351 first
= DECL_CHAIN (first
);
7356 auto_vec
<tree
, 16> v
;
7357 v
.safe_grow (count
);
7359 for (unsigned int i
= 0; i
< count
; i
++, d
= DECL_CHAIN (d
))
7361 v
[count
- i
- 1] = d
;
7362 fit_decomposition_lang_decl (d
, decl
);
7365 tree type
= TREE_TYPE (decl
);
7368 if (TREE_CODE (type
) == REFERENCE_TYPE
)
7370 dexp
= convert_from_reference (dexp
);
7371 type
= TREE_TYPE (type
);
7374 tree eltype
= NULL_TREE
;
7375 unsigned HOST_WIDE_INT eltscnt
= 0;
7376 if (TREE_CODE (type
) == ARRAY_TYPE
)
7379 nelts
= array_type_nelts_top (type
);
7380 if (nelts
== error_mark_node
)
7382 if (!tree_fits_uhwi_p (nelts
))
7384 error_at (loc
, "cannot decompose variable length array %qT", type
);
7387 eltscnt
= tree_to_uhwi (nelts
);
7388 if (count
!= eltscnt
)
7391 if (count
> eltscnt
)
7392 error_at (loc
, "%u names provided while %qT decomposes into "
7393 "%wu elements", count
, type
, eltscnt
);
7395 error_at (loc
, "only %u names provided while %qT decomposes into "
7396 "%wu elements", count
, type
, eltscnt
);
7399 eltype
= TREE_TYPE (type
);
7400 for (unsigned int i
= 0; i
< count
; i
++)
7402 TREE_TYPE (v
[i
]) = eltype
;
7403 layout_decl (v
[i
], 0);
7404 if (processing_template_decl
)
7406 tree t
= unshare_expr (dexp
);
7407 t
= build4_loc (DECL_SOURCE_LOCATION (v
[i
]), ARRAY_REF
,
7408 eltype
, t
, size_int (i
), NULL_TREE
,
7410 SET_DECL_VALUE_EXPR (v
[i
], t
);
7411 DECL_HAS_VALUE_EXPR_P (v
[i
]) = 1;
7414 /* 2 GNU extensions. */
7415 else if (TREE_CODE (type
) == COMPLEX_TYPE
)
7418 if (count
!= eltscnt
)
7420 eltype
= cp_build_qualified_type (TREE_TYPE (type
), TYPE_QUALS (type
));
7421 for (unsigned int i
= 0; i
< count
; i
++)
7423 TREE_TYPE (v
[i
]) = eltype
;
7424 layout_decl (v
[i
], 0);
7425 if (processing_template_decl
)
7427 tree t
= unshare_expr (dexp
);
7428 t
= build1_loc (DECL_SOURCE_LOCATION (v
[i
]),
7429 i
? IMAGPART_EXPR
: REALPART_EXPR
, eltype
,
7431 SET_DECL_VALUE_EXPR (v
[i
], t
);
7432 DECL_HAS_VALUE_EXPR_P (v
[i
]) = 1;
7435 else if (TREE_CODE (type
) == VECTOR_TYPE
)
7437 eltscnt
= TYPE_VECTOR_SUBPARTS (type
);
7438 if (count
!= eltscnt
)
7440 eltype
= cp_build_qualified_type (TREE_TYPE (type
), TYPE_QUALS (type
));
7441 for (unsigned int i
= 0; i
< count
; i
++)
7443 TREE_TYPE (v
[i
]) = eltype
;
7444 layout_decl (v
[i
], 0);
7445 if (processing_template_decl
)
7447 tree t
= unshare_expr (dexp
);
7448 convert_vector_to_array_for_subscript (DECL_SOURCE_LOCATION (v
[i
]),
7450 t
= build4_loc (DECL_SOURCE_LOCATION (v
[i
]), ARRAY_REF
,
7451 eltype
, t
, size_int (i
), NULL_TREE
,
7453 SET_DECL_VALUE_EXPR (v
[i
], t
);
7454 DECL_HAS_VALUE_EXPR_P (v
[i
]) = 1;
7457 else if (tree tsize
= get_tuple_size (type
))
7459 if (tsize
== error_mark_node
)
7461 error_at (loc
, "%<std::tuple_size<%T>::value%> is not an integral "
7462 "constant expression", type
);
7465 eltscnt
= tree_to_uhwi (tsize
);
7466 if (count
!= eltscnt
)
7468 int save_read
= DECL_READ_P (decl
);
7469 for (unsigned i
= 0; i
< count
; ++i
)
7471 location_t sloc
= input_location
;
7472 location_t dloc
= DECL_SOURCE_LOCATION (v
[i
]);
7474 input_location
= dloc
;
7475 tree init
= get_tuple_decomp_init (decl
, i
);
7476 tree eltype
= (init
== error_mark_node
? error_mark_node
7477 : get_tuple_element_type (type
, i
));
7478 input_location
= sloc
;
7480 if (init
== error_mark_node
|| eltype
== error_mark_node
)
7482 inform (dloc
, "in initialization of structured binding "
7483 "variable %qD", v
[i
]);
7486 /* Save the decltype away before reference collapse. */
7487 store_decomp_type (v
[i
], eltype
);
7488 eltype
= cp_build_reference_type (eltype
, !lvalue_p (init
));
7489 TREE_TYPE (v
[i
]) = eltype
;
7490 layout_decl (v
[i
], 0);
7491 if (DECL_HAS_VALUE_EXPR_P (v
[i
]))
7493 /* In this case the names are variables, not just proxies. */
7494 SET_DECL_VALUE_EXPR (v
[i
], NULL_TREE
);
7495 DECL_HAS_VALUE_EXPR_P (v
[i
]) = 0;
7497 if (!processing_template_decl
)
7498 cp_finish_decl (v
[i
], init
, /*constexpr*/false,
7499 /*asm*/NULL_TREE
, LOOKUP_NORMAL
);
7501 /* Ignore reads from the underlying decl performed during initialization
7502 of the individual variables. If those will be read, we'll mark
7503 the underlying decl as read at that point. */
7504 DECL_READ_P (decl
) = save_read
;
7506 else if (TREE_CODE (type
) == UNION_TYPE
)
7508 error_at (loc
, "cannot decompose union type %qT", type
);
7511 else if (!CLASS_TYPE_P (type
))
7513 error_at (loc
, "cannot decompose non-array non-class type %qT", type
);
7516 else if (LAMBDA_TYPE_P (type
))
7518 error_at (loc
, "cannot decompose lambda closure type %qT", type
);
7523 tree btype
= find_decomp_class_base (loc
, type
, NULL_TREE
);
7524 if (btype
== error_mark_node
)
7526 else if (btype
== NULL_TREE
)
7528 error_at (loc
, "cannot decompose class type %qT without non-static "
7529 "data members", type
);
7532 for (tree field
= TYPE_FIELDS (btype
); field
; field
= TREE_CHAIN (field
))
7533 if (TREE_CODE (field
) != FIELD_DECL
|| DECL_ARTIFICIAL (field
))
7537 if (count
!= eltscnt
)
7542 t
= convert_to_base (t
, btype
, /*check_access*/true,
7543 /*nonnull*/false, tf_warning_or_error
);
7547 for (tree field
= TYPE_FIELDS (btype
); field
; field
= TREE_CHAIN (field
))
7548 if (TREE_CODE (field
) != FIELD_DECL
|| DECL_ARTIFICIAL (field
))
7552 tree tt
= finish_non_static_data_member (field
, unshare_expr (t
),
7554 if (REFERENCE_REF_P (tt
))
7555 tt
= TREE_OPERAND (tt
, 0);
7556 TREE_TYPE (v
[i
]) = TREE_TYPE (tt
);
7557 layout_decl (v
[i
], 0);
7558 if (!processing_template_decl
)
7560 SET_DECL_VALUE_EXPR (v
[i
], tt
);
7561 DECL_HAS_VALUE_EXPR_P (v
[i
]) = 1;
7566 if (processing_template_decl
)
7568 for (unsigned int i
= 0; i
< count
; i
++)
7569 if (!DECL_HAS_VALUE_EXPR_P (v
[i
]))
7571 tree a
= build_nt (ARRAY_REF
, decl
, size_int (i
),
7572 NULL_TREE
, NULL_TREE
);
7573 SET_DECL_VALUE_EXPR (v
[i
], a
);
7574 DECL_HAS_VALUE_EXPR_P (v
[i
]) = 1;
7577 else if (DECL_NAMESPACE_SCOPE_P (decl
))
7578 SET_DECL_ASSEMBLER_NAME (decl
, mangle_decomp (decl
, v
));
7581 /* Returns a declaration for a VAR_DECL as if:
7583 extern "C" TYPE NAME;
7585 had been seen. Used to create compiler-generated global
7589 declare_global_var (tree name
, tree type
)
7593 push_to_top_level ();
7594 decl
= build_decl (input_location
, VAR_DECL
, name
, type
);
7595 TREE_PUBLIC (decl
) = 1;
7596 DECL_EXTERNAL (decl
) = 1;
7597 DECL_ARTIFICIAL (decl
) = 1;
7598 DECL_CONTEXT (decl
) = FROB_CONTEXT (global_namespace
);
7599 /* If the user has explicitly declared this variable (perhaps
7600 because the code we are compiling is part of a low-level runtime
7601 library), then it is possible that our declaration will be merged
7602 with theirs by pushdecl. */
7603 decl
= pushdecl (decl
);
7604 cp_finish_decl (decl
, NULL_TREE
, false, NULL_TREE
, 0);
7605 pop_from_top_level ();
7610 /* Returns the type for the argument to "__cxa_atexit" (or "atexit",
7611 if "__cxa_atexit" is not being used) corresponding to the function
7612 to be called when the program exits. */
7615 get_atexit_fn_ptr_type (void)
7619 if (!atexit_fn_ptr_type_node
)
7622 if (flag_use_cxa_atexit
7623 && !targetm
.cxx
.use_atexit_for_cxa_atexit ())
7624 /* The parameter to "__cxa_atexit" is "void (*)(void *)". */
7625 arg_type
= ptr_type_node
;
7627 /* The parameter to "atexit" is "void (*)(void)". */
7628 arg_type
= NULL_TREE
;
7630 fn_type
= build_function_type_list (void_type_node
,
7631 arg_type
, NULL_TREE
);
7632 atexit_fn_ptr_type_node
= build_pointer_type (fn_type
);
7635 return atexit_fn_ptr_type_node
;
7638 /* Returns a pointer to the `atexit' function. Note that if
7639 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
7640 `__cxa_atexit' function specified in the IA64 C++ ABI. */
7643 get_atexit_node (void)
7649 bool use_aeabi_atexit
;
7654 if (flag_use_cxa_atexit
&& !targetm
.cxx
.use_atexit_for_cxa_atexit ())
7656 /* The declaration for `__cxa_atexit' is:
7658 int __cxa_atexit (void (*)(void *), void *, void *)
7660 We build up the argument types and then the function type
7662 tree argtype0
, argtype1
, argtype2
;
7664 use_aeabi_atexit
= targetm
.cxx
.use_aeabi_atexit ();
7665 /* First, build the pointer-to-function type for the first
7667 fn_ptr_type
= get_atexit_fn_ptr_type ();
7668 /* Then, build the rest of the argument types. */
7669 argtype2
= ptr_type_node
;
7670 if (use_aeabi_atexit
)
7672 argtype1
= fn_ptr_type
;
7673 argtype0
= ptr_type_node
;
7677 argtype1
= ptr_type_node
;
7678 argtype0
= fn_ptr_type
;
7680 /* And the final __cxa_atexit type. */
7681 fn_type
= build_function_type_list (integer_type_node
,
7682 argtype0
, argtype1
, argtype2
,
7684 if (use_aeabi_atexit
)
7685 name
= "__aeabi_atexit";
7687 name
= "__cxa_atexit";
7691 /* The declaration for `atexit' is:
7693 int atexit (void (*)());
7695 We build up the argument types and then the function type
7697 fn_ptr_type
= get_atexit_fn_ptr_type ();
7698 /* Build the final atexit type. */
7699 fn_type
= build_function_type_list (integer_type_node
,
7700 fn_ptr_type
, NULL_TREE
);
7704 /* Now, build the function declaration. */
7705 push_lang_context (lang_name_c
);
7706 atexit_fndecl
= build_library_fn_ptr (name
, fn_type
, ECF_LEAF
| ECF_NOTHROW
);
7707 mark_used (atexit_fndecl
);
7708 pop_lang_context ();
7709 atexit_node
= decay_conversion (atexit_fndecl
, tf_warning_or_error
);
7714 /* Like get_atexit_node, but for thread-local cleanups. */
7717 get_thread_atexit_node (void)
7719 /* The declaration for `__cxa_thread_atexit' is:
7721 int __cxa_thread_atexit (void (*)(void *), void *, void *) */
7722 tree fn_type
= build_function_type_list (integer_type_node
,
7723 get_atexit_fn_ptr_type (),
7724 ptr_type_node
, ptr_type_node
,
7727 /* Now, build the function declaration. */
7728 tree atexit_fndecl
= build_library_fn_ptr ("__cxa_thread_atexit", fn_type
,
7729 ECF_LEAF
| ECF_NOTHROW
);
7730 return decay_conversion (atexit_fndecl
, tf_warning_or_error
);
7733 /* Returns the __dso_handle VAR_DECL. */
7736 get_dso_handle_node (void)
7738 if (dso_handle_node
)
7739 return dso_handle_node
;
7741 /* Declare the variable. */
7742 dso_handle_node
= declare_global_var (get_identifier ("__dso_handle"),
7745 #ifdef HAVE_GAS_HIDDEN
7746 if (dso_handle_node
!= error_mark_node
)
7748 DECL_VISIBILITY (dso_handle_node
) = VISIBILITY_HIDDEN
;
7749 DECL_VISIBILITY_SPECIFIED (dso_handle_node
) = 1;
7753 return dso_handle_node
;
7756 /* Begin a new function with internal linkage whose job will be simply
7757 to destroy some particular variable. */
7759 static GTY(()) int start_cleanup_cnt
;
7762 start_cleanup_fn (void)
7767 bool use_cxa_atexit
= flag_use_cxa_atexit
7768 && !targetm
.cxx
.use_atexit_for_cxa_atexit ();
7770 push_to_top_level ();
7772 /* No need to mangle this. */
7773 push_lang_context (lang_name_c
);
7775 /* Build the name of the function. */
7776 sprintf (name
, "__tcf_%d", start_cleanup_cnt
++);
7777 /* Build the function declaration. */
7778 fntype
= TREE_TYPE (get_atexit_fn_ptr_type ());
7779 fndecl
= build_lang_decl (FUNCTION_DECL
, get_identifier (name
), fntype
);
7780 /* It's a function with internal linkage, generated by the
7782 TREE_PUBLIC (fndecl
) = 0;
7783 DECL_ARTIFICIAL (fndecl
) = 1;
7784 /* Make the function `inline' so that it is only emitted if it is
7785 actually needed. It is unlikely that it will be inlined, since
7786 it is only called via a function pointer, but we avoid unnecessary
7787 emissions this way. */
7788 DECL_DECLARED_INLINE_P (fndecl
) = 1;
7789 DECL_INTERFACE_KNOWN (fndecl
) = 1;
7790 /* Build the parameter. */
7793 tree parmdecl
= cp_build_parm_decl (fndecl
, NULL_TREE
, ptr_type_node
);
7794 TREE_USED (parmdecl
) = 1;
7795 DECL_READ_P (parmdecl
) = 1;
7796 DECL_ARGUMENTS (fndecl
) = parmdecl
;
7800 start_preparsed_function (fndecl
, NULL_TREE
, SF_PRE_PARSED
);
7802 pop_lang_context ();
7804 return current_function_decl
;
7807 /* Finish the cleanup function begun by start_cleanup_fn. */
7810 end_cleanup_fn (void)
7812 expand_or_defer_fn (finish_function (/*inline_p=*/false));
7814 pop_from_top_level ();
7817 /* Generate code to handle the destruction of DECL, an object with
7818 static storage duration. */
7821 register_dtor_fn (tree decl
)
7828 bool ob_parm
, dso_parm
, use_dtor
;
7829 tree arg0
, arg1
, arg2
;
7832 type
= TREE_TYPE (decl
);
7833 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type
))
7836 /* If we're using "__cxa_atexit" (or "__cxa_thread_atexit" or
7837 "__aeabi_atexit"), and DECL is a class object, we can just pass the
7838 destructor to "__cxa_atexit"; we don't have to build a temporary
7839 function to do the cleanup. */
7840 dso_parm
= (flag_use_cxa_atexit
7841 && !targetm
.cxx
.use_atexit_for_cxa_atexit ());
7842 ob_parm
= (CP_DECL_THREAD_LOCAL_P (decl
) || dso_parm
);
7843 use_dtor
= ob_parm
&& CLASS_TYPE_P (type
);
7846 cleanup
= get_class_binding (type
, complete_dtor_identifier
);
7848 /* Make sure it is accessible. */
7849 perform_or_defer_access_check (TYPE_BINFO (type
), cleanup
, cleanup
,
7850 tf_warning_or_error
);
7854 /* Call build_cleanup before we enter the anonymous function so
7855 that any access checks will be done relative to the current
7856 scope, rather than the scope of the anonymous function. */
7857 build_cleanup (decl
);
7859 /* Now start the function. */
7860 cleanup
= start_cleanup_fn ();
7862 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
7863 to the original function, rather than the anonymous one. That
7864 will make the back end think that nested functions are in use,
7865 which causes confusion. */
7866 push_deferring_access_checks (dk_no_check
);
7867 fcall
= build_cleanup (decl
);
7868 pop_deferring_access_checks ();
7870 /* Create the body of the anonymous function. */
7871 compound_stmt
= begin_compound_stmt (BCS_FN_BODY
);
7872 finish_expr_stmt (fcall
);
7873 finish_compound_stmt (compound_stmt
);
7877 /* Call atexit with the cleanup function. */
7878 mark_used (cleanup
);
7879 cleanup
= build_address (cleanup
);
7881 if (CP_DECL_THREAD_LOCAL_P (decl
))
7882 atex_node
= get_thread_atexit_node ();
7884 atex_node
= get_atexit_node ();
7888 /* We must convert CLEANUP to the type that "__cxa_atexit"
7890 cleanup
= build_nop (get_atexit_fn_ptr_type (), cleanup
);
7891 /* "__cxa_atexit" will pass the address of DECL to the
7892 cleanup function. */
7894 addr
= build_address (decl
);
7895 /* The declared type of the parameter to "__cxa_atexit" is
7896 "void *". For plain "T*", we could just let the
7897 machinery in cp_build_function_call convert it -- but if the
7898 type is "cv-qualified T *", then we need to convert it
7899 before passing it in, to avoid spurious errors. */
7900 addr
= build_nop (ptr_type_node
, addr
);
7903 /* Since the cleanup functions we build ignore the address
7904 they're given, there's no reason to pass the actual address
7905 in, and, in general, it's cheaper to pass NULL than any
7907 addr
= null_pointer_node
;
7910 arg2
= cp_build_addr_expr (get_dso_handle_node (),
7911 tf_warning_or_error
);
7913 /* Just pass NULL to the dso handle parm if we don't actually
7914 have a DSO handle on this target. */
7915 arg2
= null_pointer_node
;
7921 if (!CP_DECL_THREAD_LOCAL_P (decl
)
7922 && targetm
.cxx
.use_aeabi_atexit ())
7938 return cp_build_function_call_nary (atex_node
, tf_warning_or_error
,
7939 arg0
, arg1
, arg2
, NULL_TREE
);
7942 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
7943 is its initializer. Generate code to handle the construction
7944 and destruction of DECL. */
7947 expand_static_init (tree decl
, tree init
)
7949 gcc_assert (VAR_P (decl
));
7950 gcc_assert (TREE_STATIC (decl
));
7952 /* Some variables require no dynamic initialization. */
7953 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl
)))
7955 /* Make sure the destructor is callable. */
7956 cxx_maybe_build_cleanup (decl
, tf_warning_or_error
);
7961 if (CP_DECL_THREAD_LOCAL_P (decl
) && DECL_GNU_TLS_P (decl
)
7962 && !DECL_FUNCTION_SCOPE_P (decl
))
7965 error ("non-local variable %qD declared %<__thread%> "
7966 "needs dynamic initialization", decl
);
7968 error ("non-local variable %qD declared %<__thread%> "
7969 "has a non-trivial destructor", decl
);
7970 static bool informed
;
7973 inform (DECL_SOURCE_LOCATION (decl
),
7974 "C++11 %<thread_local%> allows dynamic initialization "
7981 if (DECL_FUNCTION_SCOPE_P (decl
))
7983 /* Emit code to perform this initialization but once. */
7984 tree if_stmt
= NULL_TREE
, inner_if_stmt
= NULL_TREE
;
7985 tree then_clause
= NULL_TREE
, inner_then_clause
= NULL_TREE
;
7986 tree guard
, guard_addr
;
7988 /* We don't need thread-safety code for thread-local vars. */
7989 bool thread_guard
= (flag_threadsafe_statics
7990 && !CP_DECL_THREAD_LOCAL_P (decl
));
7992 /* Emit code to perform this initialization but once. This code
7995 static <type> guard;
7996 if (!__atomic_load (guard.first_byte)) {
7997 if (__cxa_guard_acquire (&guard)) {
8000 // Do initialization.
8001 flag = true; __cxa_guard_release (&guard);
8002 // Register variable for destruction at end of program.
8004 if (!flag) __cxa_guard_abort (&guard);
8009 Note that the `flag' variable is only set to 1 *after* the
8010 initialization is complete. This ensures that an exception,
8011 thrown during the construction, will cause the variable to
8012 reinitialized when we pass through this code again, as per:
8016 If the initialization exits by throwing an exception, the
8017 initialization is not complete, so it will be tried again
8018 the next time control enters the declaration.
8020 This process should be thread-safe, too; multiple threads
8021 should not be able to initialize the variable more than
8024 /* Create the guard variable. */
8025 guard
= get_guard (decl
);
8027 /* Begin the conditional initialization. */
8028 if_stmt
= begin_if_stmt ();
8030 finish_if_stmt_cond (get_guard_cond (guard
, thread_guard
), if_stmt
);
8031 then_clause
= begin_compound_stmt (BCS_NO_SCOPE
);
8035 tree vfntype
= NULL_TREE
;
8036 tree acquire_name
, release_name
, abort_name
;
8037 tree acquire_fn
, release_fn
, abort_fn
;
8038 guard_addr
= build_address (guard
);
8040 acquire_name
= get_identifier ("__cxa_guard_acquire");
8041 release_name
= get_identifier ("__cxa_guard_release");
8042 abort_name
= get_identifier ("__cxa_guard_abort");
8043 acquire_fn
= get_global_binding (acquire_name
);
8044 release_fn
= get_global_binding (release_name
);
8045 abort_fn
= get_global_binding (abort_name
);
8047 acquire_fn
= push_library_fn
8048 (acquire_name
, build_function_type_list (integer_type_node
,
8049 TREE_TYPE (guard_addr
),
8051 NULL_TREE
, ECF_NOTHROW
| ECF_LEAF
);
8052 if (!release_fn
|| !abort_fn
)
8053 vfntype
= build_function_type_list (void_type_node
,
8054 TREE_TYPE (guard_addr
),
8057 release_fn
= push_library_fn (release_name
, vfntype
, NULL_TREE
,
8058 ECF_NOTHROW
| ECF_LEAF
);
8060 abort_fn
= push_library_fn (abort_name
, vfntype
, NULL_TREE
,
8061 ECF_NOTHROW
| ECF_LEAF
);
8063 inner_if_stmt
= begin_if_stmt ();
8064 finish_if_stmt_cond (build_call_n (acquire_fn
, 1, guard_addr
),
8067 inner_then_clause
= begin_compound_stmt (BCS_NO_SCOPE
);
8068 begin
= get_target_expr (boolean_false_node
);
8069 flag
= TARGET_EXPR_SLOT (begin
);
8071 TARGET_EXPR_CLEANUP (begin
)
8072 = build3 (COND_EXPR
, void_type_node
, flag
,
8074 build_call_n (abort_fn
, 1, guard_addr
));
8075 CLEANUP_EH_ONLY (begin
) = 1;
8077 /* Do the initialization itself. */
8078 init
= add_stmt_to_compound (begin
, init
);
8079 init
= add_stmt_to_compound
8080 (init
, build2 (MODIFY_EXPR
, void_type_node
, flag
, boolean_true_node
));
8081 init
= add_stmt_to_compound
8082 (init
, build_call_n (release_fn
, 1, guard_addr
));
8085 init
= add_stmt_to_compound (init
, set_guard (guard
));
8087 /* Use atexit to register a function for destroying this static
8089 init
= add_stmt_to_compound (init
, register_dtor_fn (decl
));
8091 finish_expr_stmt (init
);
8095 finish_compound_stmt (inner_then_clause
);
8096 finish_then_clause (inner_if_stmt
);
8097 finish_if_stmt (inner_if_stmt
);
8100 finish_compound_stmt (then_clause
);
8101 finish_then_clause (if_stmt
);
8102 finish_if_stmt (if_stmt
);
8104 else if (CP_DECL_THREAD_LOCAL_P (decl
))
8105 tls_aggregates
= tree_cons (init
, decl
, tls_aggregates
);
8107 static_aggregates
= tree_cons (init
, decl
, static_aggregates
);
8111 /* Make TYPE a complete type based on INITIAL_VALUE.
8112 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
8113 2 if there was no information (in which case assume 0 if DO_DEFAULT),
8114 3 if the initializer list is empty (in pedantic mode). */
8117 cp_complete_array_type (tree
*ptype
, tree initial_value
, bool do_default
)
8120 tree type
, elt_type
;
8122 /* Don't get confused by a CONSTRUCTOR for some other type. */
8123 if (initial_value
&& TREE_CODE (initial_value
) == CONSTRUCTOR
8124 && !BRACE_ENCLOSED_INITIALIZER_P (initial_value
)
8125 && TREE_CODE (TREE_TYPE (initial_value
)) != ARRAY_TYPE
)
8130 unsigned HOST_WIDE_INT i
;
8133 /* An array of character type can be initialized from a
8134 brace-enclosed string constant.
8136 FIXME: this code is duplicated from reshape_init. Probably
8137 we should just call reshape_init here? */
8138 if (char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (*ptype
)))
8139 && TREE_CODE (initial_value
) == CONSTRUCTOR
8140 && !vec_safe_is_empty (CONSTRUCTOR_ELTS (initial_value
)))
8142 vec
<constructor_elt
, va_gc
> *v
= CONSTRUCTOR_ELTS (initial_value
);
8143 tree value
= (*v
)[0].value
;
8145 if (TREE_CODE (value
) == STRING_CST
8146 && v
->length () == 1)
8147 initial_value
= value
;
8150 /* If any of the elements are parameter packs, we can't actually
8151 complete this type now because the array size is dependent. */
8152 if (TREE_CODE (initial_value
) == CONSTRUCTOR
)
8154 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (initial_value
),
8157 if (PACK_EXPANSION_P (value
))
8163 failure
= complete_array_type (ptype
, initial_value
, do_default
);
8165 /* We can create the array before the element type is complete, which
8166 means that we didn't have these two bits set in the original type
8167 either. In completing the type, we are expected to propagate these
8168 bits. See also complete_type which does the same thing for arrays
8171 if (TYPE_DOMAIN (type
))
8173 elt_type
= TREE_TYPE (type
);
8174 TYPE_NEEDS_CONSTRUCTING (type
) = TYPE_NEEDS_CONSTRUCTING (elt_type
);
8175 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type
)
8176 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (elt_type
);
8182 /* As above, but either give an error or reject zero-size arrays, depending
8186 cp_complete_array_type_or_error (tree
*ptype
, tree initial_value
,
8187 bool do_default
, tsubst_flags_t complain
)
8190 bool sfinae
= !(complain
& tf_error
);
8191 /* In SFINAE context we can't be lenient about zero-size arrays. */
8194 failure
= cp_complete_array_type (ptype
, initial_value
, do_default
);
8200 /* Not an error. */;
8201 else if (failure
== 1)
8202 error ("initializer fails to determine size of %qT", *ptype
);
8203 else if (failure
== 2)
8206 error ("array size missing in %qT", *ptype
);
8208 else if (failure
== 3)
8209 error ("zero-size array %qT", *ptype
);
8210 *ptype
= error_mark_node
;
8215 /* Return zero if something is declared to be a member of type
8216 CTYPE when in the context of CUR_TYPE. STRING is the error
8217 message to print in that case. Otherwise, quietly return 1. */
8220 member_function_or_else (tree ctype
, tree cur_type
, enum overload_flags flags
)
8222 if (ctype
&& ctype
!= cur_type
)
8224 if (flags
== DTOR_FLAG
)
8225 error ("destructor for alien class %qT cannot be a member", ctype
);
8227 error ("constructor for alien class %qT cannot be a member", ctype
);
8233 /* Subroutine of `grokdeclarator'. */
8235 /* Generate errors possibly applicable for a given set of specifiers.
8236 This is for ARM $7.1.2. */
8239 bad_specifiers (tree object
,
8240 enum bad_spec_place type
,
8251 error ("%qD declared as a %<virtual%> variable", object
);
8253 error ("%<const%> and %<volatile%> function specifiers on "
8254 "%qD invalid in variable declaration", object
);
8258 error ("%qD declared as a %<virtual%> parameter", object
);
8260 error ("%qD declared as an %<inline%> parameter", object
);
8262 error ("%<const%> and %<volatile%> function specifiers on "
8263 "%qD invalid in parameter declaration", object
);
8267 error ("%qD declared as a %<virtual%> type", object
);
8269 error ("%qD declared as an %<inline%> type", object
);
8271 error ("%<const%> and %<volatile%> function specifiers on "
8272 "%qD invalid in type declaration", object
);
8276 error ("%qD declared as a %<virtual%> field", object
);
8278 error ("%qD declared as an %<inline%> field", object
);
8280 error ("%<const%> and %<volatile%> function specifiers on "
8281 "%qD invalid in field declaration", object
);
8287 error ("%q+D declared as a friend", object
);
8289 && !flag_noexcept_type
8290 && (TREE_CODE (object
) == TYPE_DECL
8291 || (!TYPE_PTRFN_P (TREE_TYPE (object
))
8292 && !TYPE_REFFN_P (TREE_TYPE (object
))
8293 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (object
)))))
8294 error ("%q+D declared with an exception specification", object
);
8297 /* DECL is a member function or static data member and is presently
8298 being defined. Check that the definition is taking place in a
8302 check_class_member_definition_namespace (tree decl
)
8304 /* These checks only apply to member functions and static data
8306 gcc_assert (VAR_OR_FUNCTION_DECL_P (decl
));
8307 /* We check for problems with specializations in pt.c in
8308 check_specialization_namespace, where we can issue better
8310 if (processing_specialization
)
8312 /* We check this in check_explicit_instantiation_namespace. */
8313 if (processing_explicit_instantiation
)
8317 A member function definition that appears outside of the
8318 class definition shall appear in a namespace scope enclosing
8319 the class definition.
8323 The definition for a static data member shall appear in a
8324 namespace scope enclosing the member's class definition. */
8325 if (!is_ancestor (current_namespace
, DECL_CONTEXT (decl
)))
8326 permerror (input_location
, "definition of %qD is not in namespace enclosing %qT",
8327 decl
, DECL_CONTEXT (decl
));
8330 /* Build a PARM_DECL for the "this" parameter of FN. TYPE is the
8331 METHOD_TYPE for a non-static member function; QUALS are the
8332 cv-qualifiers that apply to the function. */
8335 build_this_parm (tree fn
, tree type
, cp_cv_quals quals
)
8340 cp_cv_quals this_quals
;
8342 if (CLASS_TYPE_P (type
))
8345 = cp_build_qualified_type (type
, quals
& ~TYPE_QUAL_RESTRICT
);
8346 this_type
= build_pointer_type (this_type
);
8349 this_type
= type_of_this_parm (type
);
8350 /* The `this' parameter is implicitly `const'; it cannot be
8352 this_quals
= (quals
& TYPE_QUAL_RESTRICT
) | TYPE_QUAL_CONST
;
8353 qual_type
= cp_build_qualified_type (this_type
, this_quals
);
8354 parm
= build_artificial_parm (fn
, this_identifier
, qual_type
);
8355 cp_apply_type_quals_to_decl (this_quals
, parm
);
8359 /* DECL is a static member function. Complain if it was declared
8360 with function-cv-quals. */
8363 check_static_quals (tree decl
, cp_cv_quals quals
)
8365 if (quals
!= TYPE_UNQUALIFIED
)
8366 error ("static member function %q#D declared with type qualifiers",
8370 // Check that FN takes no arguments and returns bool.
8372 check_concept_fn (tree fn
)
8374 // A constraint is nullary.
8375 if (DECL_ARGUMENTS (fn
))
8376 error ("concept %q#D declared with function parameters", fn
);
8378 // The declared return type of the concept shall be bool, and
8379 // it shall not be deduced from it definition.
8380 tree type
= TREE_TYPE (TREE_TYPE (fn
));
8382 error ("concept %q#D declared with a deduced return type", fn
);
8383 else if (type
!= boolean_type_node
)
8384 error ("concept %q#D with non-%<bool%> return type %qT", fn
, type
);
8387 /* Helper function. Replace the temporary this parameter injected
8388 during cp_finish_omp_declare_simd with the real this parameter. */
8391 declare_simd_adjust_this (tree
*tp
, int *walk_subtrees
, void *data
)
8393 tree this_parm
= (tree
) data
;
8394 if (TREE_CODE (*tp
) == PARM_DECL
8395 && DECL_NAME (*tp
) == this_identifier
8396 && *tp
!= this_parm
)
8398 else if (TYPE_P (*tp
))
8403 /* CTYPE is class type, or null if non-class.
8404 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
8406 DECLARATOR is the function's name.
8407 PARMS is a chain of PARM_DECLs for the function.
8408 VIRTUALP is truthvalue of whether the function is virtual or not.
8409 FLAGS are to be passed through to `grokclassfn'.
8410 QUALS are qualifiers indicating whether the function is `const'
8412 RAISES is a list of exceptions that this function can raise.
8413 CHECK is 1 if we must find this method in CTYPE, 0 if we should
8414 not look, and -1 if we should not call `grokclassfn' at all.
8416 SFK is the kind of special function (if any) for the new function.
8418 Returns `NULL_TREE' if something goes wrong, after issuing
8419 applicable error messages. */
8422 grokfndecl (tree ctype
,
8426 tree orig_declarator
,
8429 enum overload_flags flags
,
8431 cp_ref_qualifier rqual
,
8438 special_function_kind sfk
,
8443 location_t location
)
8446 int staticp
= ctype
&& TREE_CODE (type
) == FUNCTION_TYPE
;
8449 // Was the concept specifier present?
8450 bool concept_p
= inlinep
& 4;
8452 // Concept declarations must have a corresponding definition.
8453 if (concept_p
&& !funcdef_flag
)
8455 error ("concept %qD has no definition", declarator
);
8460 type
= build_ref_qualified_type (type
, rqual
);
8462 type
= build_exception_variant (type
, raises
);
8464 decl
= build_lang_decl (FUNCTION_DECL
, declarator
, type
);
8466 /* Set the constraints on the declaration. */
8469 tree tmpl_reqs
= NULL_TREE
;
8470 if (processing_template_decl
> template_class_depth (ctype
))
8471 tmpl_reqs
= TEMPLATE_PARMS_CONSTRAINTS (current_template_parms
);
8473 /* Adjust the required expression into a constraint. */
8475 decl_reqs
= normalize_expression (decl_reqs
);
8477 tree ci
= build_constraints (tmpl_reqs
, decl_reqs
);
8478 set_constraints (decl
, ci
);
8481 /* If we have an explicit location, use it, otherwise use whatever
8482 build_lang_decl used (probably input_location). */
8483 if (location
!= UNKNOWN_LOCATION
)
8484 DECL_SOURCE_LOCATION (decl
) = location
;
8486 if (TREE_CODE (type
) == METHOD_TYPE
)
8488 tree parm
= build_this_parm (decl
, type
, quals
);
8489 DECL_CHAIN (parm
) = parms
;
8492 /* Allocate space to hold the vptr bit if needed. */
8493 SET_DECL_ALIGN (decl
, MINIMUM_METHOD_BOUNDARY
);
8496 DECL_ARGUMENTS (decl
) = parms
;
8497 for (t
= parms
; t
; t
= DECL_CHAIN (t
))
8498 DECL_CONTEXT (t
) = decl
;
8500 /* Propagate volatile out from type to decl. */
8501 if (TYPE_VOLATILE (type
))
8502 TREE_THIS_VOLATILE (decl
) = 1;
8504 /* Setup decl according to sfk. */
8507 case sfk_constructor
:
8508 case sfk_copy_constructor
:
8509 case sfk_move_constructor
:
8510 DECL_CXX_CONSTRUCTOR_P (decl
) = 1;
8511 DECL_NAME (decl
) = ctor_identifier
;
8513 case sfk_destructor
:
8514 DECL_CXX_DESTRUCTOR_P (decl
) = 1;
8515 DECL_NAME (decl
) = dtor_identifier
;
8521 if (friendp
&& TREE_CODE (orig_declarator
) == TEMPLATE_ID_EXPR
)
8524 error ("defining explicit specialization %qD in friend declaration",
8528 tree fns
= TREE_OPERAND (orig_declarator
, 0);
8529 tree args
= TREE_OPERAND (orig_declarator
, 1);
8531 if (PROCESSING_REAL_TEMPLATE_DECL_P ())
8533 /* Something like `template <class T> friend void f<T>()'. */
8534 error ("invalid use of template-id %qD in declaration "
8535 "of primary template",
8541 /* A friend declaration of the form friend void f<>(). Record
8542 the information in the TEMPLATE_ID_EXPR. */
8543 SET_DECL_IMPLICIT_INSTANTIATION (decl
);
8545 gcc_assert (identifier_p (fns
) || TREE_CODE (fns
) == OVERLOAD
);
8546 DECL_TEMPLATE_INFO (decl
) = build_template_info (fns
, args
);
8548 for (t
= TYPE_ARG_TYPES (TREE_TYPE (decl
)); t
; t
= TREE_CHAIN (t
))
8549 if (TREE_PURPOSE (t
)
8550 && TREE_CODE (TREE_PURPOSE (t
)) == DEFAULT_ARG
)
8552 error ("default arguments are not allowed in declaration "
8553 "of friend template specialization %qD",
8560 error ("%<inline%> is not allowed in declaration of friend "
8561 "template specialization %qD",
8568 /* If this decl has namespace scope, set that up. */
8570 set_decl_namespace (decl
, in_namespace
, friendp
);
8572 DECL_CONTEXT (decl
) = FROB_CONTEXT (current_decl_namespace ());
8574 /* `main' and builtins have implicit 'C' linkage. */
8575 if (ctype
== NULL_TREE
8576 && DECL_FILE_SCOPE_P (decl
)
8577 && current_lang_name
== lang_name_cplusplus
8578 && (MAIN_NAME_P (declarator
)
8579 || (IDENTIFIER_LENGTH (declarator
) > 10
8580 && IDENTIFIER_POINTER (declarator
)[0] == '_'
8581 && IDENTIFIER_POINTER (declarator
)[1] == '_'
8582 && strncmp (IDENTIFIER_POINTER (declarator
)+2,
8583 "builtin_", 8) == 0)
8584 || (targetcm
.cxx_implicit_extern_c
8585 && (targetcm
.cxx_implicit_extern_c
8586 (IDENTIFIER_POINTER (declarator
))))))
8587 SET_DECL_LANGUAGE (decl
, lang_c
);
8589 /* Should probably propagate const out from type to decl I bet (mrs). */
8592 DECL_STATIC_FUNCTION_P (decl
) = 1;
8593 DECL_CONTEXT (decl
) = ctype
;
8597 DECL_DELETED_FN (decl
) = 1;
8601 DECL_CONTEXT (decl
) = ctype
;
8603 check_class_member_definition_namespace (decl
);
8606 if (ctype
== NULL_TREE
&& DECL_MAIN_P (decl
))
8608 if (PROCESSING_REAL_TEMPLATE_DECL_P())
8609 error ("cannot declare %<::main%> to be a template");
8611 error ("cannot declare %<::main%> to be inline");
8613 error ("cannot declare %<::main%> to be constexpr");
8615 error ("cannot declare %<::main%> to be static");
8620 /* Members of anonymous types and local classes have no linkage; make
8621 them internal. If a typedef is made later, this will be changed. */
8622 if (ctype
&& (!TREE_PUBLIC (TYPE_MAIN_DECL (ctype
))
8623 || decl_function_context (TYPE_MAIN_DECL (ctype
))))
8626 if (publicp
&& cxx_dialect
== cxx98
)
8628 /* [basic.link]: A name with no linkage (notably, the name of a class
8629 or enumeration declared in a local scope) shall not be used to
8630 declare an entity with linkage.
8632 DR 757 relaxes this restriction for C++0x. */
8633 no_linkage_error (decl
);
8636 TREE_PUBLIC (decl
) = publicp
;
8639 DECL_INTERFACE_KNOWN (decl
) = 1;
8640 DECL_NOT_REALLY_EXTERN (decl
) = 1;
8643 /* If the declaration was declared inline, mark it as such. */
8646 DECL_DECLARED_INLINE_P (decl
) = 1;
8648 DECL_COMDAT (decl
) = 1;
8651 DECL_DECLARED_CONSTEXPR_P (decl
) = true;
8653 // If the concept declaration specifier was found, check
8654 // that the declaration satisfies the necessary requirements.
8657 DECL_DECLARED_CONCEPT_P (decl
) = true;
8658 check_concept_fn (decl
);
8661 DECL_EXTERNAL (decl
) = 1;
8662 if (TREE_CODE (type
) == FUNCTION_TYPE
)
8665 TREE_TYPE (decl
) = apply_memfn_quals (TREE_TYPE (decl
),
8672 ? G_("static member function %qD cannot have cv-qualifier")
8673 : G_("non-member function %qD cannot have cv-qualifier"),
8675 quals
= TYPE_UNQUALIFIED
;
8681 ? G_("static member function %qD cannot have ref-qualifier")
8682 : G_("non-member function %qD cannot have ref-qualifier"),
8684 rqual
= REF_QUAL_NONE
;
8688 if (deduction_guide_p (decl
))
8690 if (!DECL_NAMESPACE_SCOPE_P (decl
))
8692 error_at (location
, "deduction guide %qD must be declared at "
8693 "namespace scope", decl
);
8698 "deduction guide %qD must not have a function body", decl
);
8700 else if (IDENTIFIER_ANY_OP_P (DECL_NAME (decl
))
8701 && !grok_op_properties (decl
, /*complain=*/true))
8703 else if (UDLIT_OPER_P (DECL_NAME (decl
)))
8705 bool long_long_unsigned_p
;
8707 const char *suffix
= NULL
;
8708 /* [over.literal]/6: Literal operators shall not have C linkage. */
8709 if (DECL_LANGUAGE (decl
) == lang_c
)
8711 error ("literal operator with C linkage");
8712 maybe_show_extern_c_location ();
8716 if (DECL_NAMESPACE_SCOPE_P (decl
))
8718 if (!check_literal_operator_args (decl
, &long_long_unsigned_p
,
8721 error ("%qD has invalid argument list", decl
);
8725 suffix
= UDLIT_OP_SUFFIX (DECL_NAME (decl
));
8726 if (long_long_unsigned_p
)
8728 if (cpp_interpret_int_suffix (parse_in
, suffix
, strlen (suffix
)))
8729 warning (0, "integer suffix %qs"
8730 " shadowed by implementation", suffix
);
8732 else if (long_double_p
)
8734 if (cpp_interpret_float_suffix (parse_in
, suffix
, strlen (suffix
)))
8735 warning (0, "floating point suffix %qs"
8736 " shadowed by implementation", suffix
);
8741 error ("%qD must be a non-member function", decl
);
8747 /* Make the init_value nonzero so pushdecl knows this is not
8748 tentative. error_mark_node is replaced later with the BLOCK. */
8749 DECL_INITIAL (decl
) = error_mark_node
;
8751 if (TYPE_NOTHROW_P (type
) || nothrow_libfn_p (decl
))
8752 TREE_NOTHROW (decl
) = 1;
8754 if (flag_openmp
|| flag_openmp_simd
|| flag_cilkplus
)
8756 /* Adjust "omp declare simd" attributes. */
8757 tree ods
= lookup_attribute ("omp declare simd", *attrlist
);
8761 for (attr
= ods
; attr
;
8762 attr
= lookup_attribute ("omp declare simd", TREE_CHAIN (attr
)))
8764 if (TREE_CODE (type
) == METHOD_TYPE
)
8765 walk_tree (&TREE_VALUE (attr
), declare_simd_adjust_this
,
8766 DECL_ARGUMENTS (decl
), NULL
);
8767 if (TREE_VALUE (attr
) != NULL_TREE
)
8769 tree cl
= TREE_VALUE (TREE_VALUE (attr
));
8770 cl
= c_omp_declare_simd_clauses_to_numbers
8771 (DECL_ARGUMENTS (decl
), cl
);
8773 TREE_VALUE (TREE_VALUE (attr
)) = cl
;
8775 TREE_VALUE (attr
) = NULL_TREE
;
8781 /* Caller will do the rest of this. */
8785 if (ctype
!= NULL_TREE
)
8786 grokclassfn (ctype
, decl
, flags
);
8789 if (cxx_dialect
>= cxx11
8790 && DECL_DESTRUCTOR_P (decl
)
8791 && !TYPE_BEING_DEFINED (DECL_CONTEXT (decl
))
8792 && !processing_template_decl
)
8793 deduce_noexcept_on_destructor (decl
);
8795 decl
= check_explicit_specialization (orig_declarator
, decl
,
8798 4 * (friendp
!= 0) +
8800 if (decl
== error_mark_node
)
8803 if (DECL_STATIC_FUNCTION_P (decl
))
8804 check_static_quals (decl
, quals
);
8808 cplus_decl_attributes (&decl
, *attrlist
, 0);
8809 *attrlist
= NULL_TREE
;
8812 /* Check main's type after attributes have been applied. */
8813 if (ctype
== NULL_TREE
&& DECL_MAIN_P (decl
))
8815 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl
)),
8818 tree oldtypeargs
= TYPE_ARG_TYPES (TREE_TYPE (decl
));
8820 error ("%<::main%> must return %<int%>");
8821 newtype
= build_function_type (integer_type_node
, oldtypeargs
);
8822 TREE_TYPE (decl
) = newtype
;
8825 check_main_parameter_types (decl
);
8828 if (ctype
!= NULL_TREE
&& check
)
8830 tree old_decl
= check_classfn (ctype
, decl
,
8831 (processing_template_decl
8832 > template_class_depth (ctype
))
8833 ? current_template_parms
8836 if (old_decl
== error_mark_node
)
8844 if (TREE_CODE (old_decl
) == TEMPLATE_DECL
)
8845 /* Because grokfndecl is always supposed to return a
8846 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
8847 here. We depend on our callers to figure out that its
8848 really a template that's being returned. */
8849 old_decl
= DECL_TEMPLATE_RESULT (old_decl
);
8851 if (DECL_STATIC_FUNCTION_P (old_decl
)
8852 && TREE_CODE (TREE_TYPE (decl
)) == METHOD_TYPE
)
8854 /* Remove the `this' parm added by grokclassfn. */
8855 revert_static_member_fn (decl
);
8856 check_static_quals (decl
, quals
);
8858 if (DECL_ARTIFICIAL (old_decl
))
8860 error ("definition of implicitly-declared %qD", old_decl
);
8863 else if (DECL_DEFAULTED_FN (old_decl
))
8865 error ("definition of explicitly-defaulted %q+D", decl
);
8866 inform (DECL_SOURCE_LOCATION (old_decl
),
8867 "%q#D explicitly defaulted here", old_decl
);
8871 /* Since we've smashed OLD_DECL to its
8872 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
8873 if (TREE_CODE (decl
) == TEMPLATE_DECL
)
8874 decl
= DECL_TEMPLATE_RESULT (decl
);
8876 /* Attempt to merge the declarations. This can fail, in
8877 the case of some invalid specialization declarations. */
8878 pushed_scope
= push_scope (ctype
);
8879 ok
= duplicate_decls (decl
, old_decl
, friendp
);
8881 pop_scope (pushed_scope
);
8884 error ("no %q#D member function declared in class %qT",
8888 if (ok
== error_mark_node
)
8894 if (DECL_CONSTRUCTOR_P (decl
) && !grok_ctor_properties (ctype
, decl
))
8897 if (ctype
== NULL_TREE
|| check
)
8901 DECL_VIRTUAL_P (decl
) = 1;
8906 /* decl is a FUNCTION_DECL.
8907 specifiers are the parsed virt-specifiers.
8909 Set flags to reflect the virt-specifiers.
8914 set_virt_specifiers (tree decl
, cp_virt_specifiers specifiers
)
8916 if (decl
== NULL_TREE
)
8918 if (specifiers
& VIRT_SPEC_OVERRIDE
)
8919 DECL_OVERRIDE_P (decl
) = 1;
8920 if (specifiers
& VIRT_SPEC_FINAL
)
8921 DECL_FINAL_P (decl
) = 1;
8925 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
8926 the linkage that DECL will receive in the object file. */
8929 set_linkage_for_static_data_member (tree decl
)
8931 /* A static data member always has static storage duration and
8932 external linkage. Note that static data members are forbidden in
8933 local classes -- the only situation in which a class has
8934 non-external linkage. */
8935 TREE_PUBLIC (decl
) = 1;
8936 TREE_STATIC (decl
) = 1;
8937 /* For non-template classes, static data members are always put
8938 out in exactly those files where they are defined, just as
8939 with ordinary namespace-scope variables. */
8940 if (!processing_template_decl
)
8941 DECL_INTERFACE_KNOWN (decl
) = 1;
8944 /* Create a VAR_DECL named NAME with the indicated TYPE.
8946 If SCOPE is non-NULL, it is the class type or namespace containing
8947 the variable. If SCOPE is NULL, the variable should is created in
8948 the innermost enclosing scope. */
8951 grokvardecl (tree type
,
8953 tree orig_declarator
,
8954 const cp_decl_specifier_seq
*declspecs
,
8963 tree explicit_scope
;
8965 gcc_assert (!name
|| identifier_p (name
));
8967 bool constp
= (type_quals
& TYPE_QUAL_CONST
) != 0;
8968 bool volatilep
= (type_quals
& TYPE_QUAL_VOLATILE
) != 0;
8970 /* Compute the scope in which to place the variable, but remember
8971 whether or not that scope was explicitly specified by the user. */
8972 explicit_scope
= scope
;
8975 /* An explicit "extern" specifier indicates a namespace-scope
8977 if (declspecs
->storage_class
== sc_extern
)
8978 scope
= current_decl_namespace ();
8979 else if (!at_function_scope_p ())
8980 scope
= current_scope ();
8984 && (/* If the variable is a namespace-scope variable declared in a
8985 template, we need DECL_LANG_SPECIFIC. */
8986 (TREE_CODE (scope
) == NAMESPACE_DECL
&& processing_template_decl
)
8987 /* Similarly for namespace-scope variables with language linkage
8989 || (TREE_CODE (scope
) == NAMESPACE_DECL
8990 && current_lang_name
!= lang_name_cplusplus
)
8991 /* Similarly for static data members. */
8993 /* Similarly for explicit specializations. */
8995 && TREE_CODE (orig_declarator
) == TEMPLATE_ID_EXPR
)))
8996 decl
= build_lang_decl (VAR_DECL
, name
, type
);
8998 decl
= build_decl (input_location
, VAR_DECL
, name
, type
);
9000 if (explicit_scope
&& TREE_CODE (explicit_scope
) == NAMESPACE_DECL
)
9001 set_decl_namespace (decl
, explicit_scope
, 0);
9003 DECL_CONTEXT (decl
) = FROB_CONTEXT (scope
);
9005 if (declspecs
->storage_class
== sc_extern
)
9007 DECL_THIS_EXTERN (decl
) = 1;
9008 DECL_EXTERNAL (decl
) = !initialized
;
9011 if (DECL_CLASS_SCOPE_P (decl
))
9013 set_linkage_for_static_data_member (decl
);
9014 /* This function is only called with out-of-class definitions. */
9015 DECL_EXTERNAL (decl
) = 0;
9016 check_class_member_definition_namespace (decl
);
9018 /* At top level, either `static' or no s.c. makes a definition
9019 (perhaps tentative), and absence of `static' makes it public. */
9020 else if (toplevel_bindings_p ())
9022 TREE_PUBLIC (decl
) = (declspecs
->storage_class
!= sc_static
9023 && (DECL_THIS_EXTERN (decl
)
9027 TREE_STATIC (decl
) = ! DECL_EXTERNAL (decl
);
9029 /* Not at top level, only `static' makes a static definition. */
9032 TREE_STATIC (decl
) = declspecs
->storage_class
== sc_static
;
9033 TREE_PUBLIC (decl
) = DECL_EXTERNAL (decl
);
9036 if (decl_spec_seq_has_spec_p (declspecs
, ds_thread
))
9038 if (DECL_EXTERNAL (decl
) || TREE_STATIC (decl
))
9040 CP_DECL_THREAD_LOCAL_P (decl
) = true;
9041 if (!processing_template_decl
)
9042 set_decl_tls_model (decl
, decl_default_tls_model (decl
));
9044 if (declspecs
->gnu_thread_keyword_p
)
9045 SET_DECL_GNU_TLS_P (decl
);
9048 /* If the type of the decl has no linkage, make sure that we'll
9049 notice that in mark_used. */
9050 if (cxx_dialect
> cxx98
9051 && decl_linkage (decl
) != lk_none
9052 && DECL_LANG_SPECIFIC (decl
) == NULL
9053 && !DECL_EXTERN_C_P (decl
)
9054 && no_linkage_check (TREE_TYPE (decl
), /*relaxed_p=*/false))
9055 retrofit_lang_decl (decl
);
9057 if (TREE_PUBLIC (decl
))
9059 /* [basic.link]: A name with no linkage (notably, the name of a class
9060 or enumeration declared in a local scope) shall not be used to
9061 declare an entity with linkage.
9063 DR 757 relaxes this restriction for C++0x. */
9064 if (cxx_dialect
< cxx11
)
9065 no_linkage_error (decl
);
9068 DECL_INTERFACE_KNOWN (decl
) = 1;
9070 if (DECL_NAME (decl
)
9071 && MAIN_NAME_P (DECL_NAME (decl
))
9072 && scope
== global_namespace
)
9073 error ("cannot declare %<::main%> to be a global variable");
9075 /* Check that the variable can be safely declared as a concept.
9076 Note that this also forbids explicit specializations. */
9079 if (!processing_template_decl
)
9081 error ("a non-template variable cannot be %<concept%>");
9085 DECL_DECLARED_CONCEPT_P (decl
) = true;
9086 if (!same_type_ignoring_top_level_qualifiers_p (type
, boolean_type_node
))
9087 error_at (declspecs
->locations
[ds_type_spec
],
9088 "concept must have type %<bool%>");
9090 else if (flag_concepts
9091 && processing_template_decl
> template_class_depth (scope
))
9093 tree reqs
= TEMPLATE_PARMS_CONSTRAINTS (current_template_parms
);
9094 tree ci
= build_constraints (reqs
, NULL_TREE
);
9095 set_constraints (decl
, ci
);
9098 // Handle explicit specializations and instantiations of variable templates.
9099 if (orig_declarator
)
9100 decl
= check_explicit_specialization (orig_declarator
, decl
,
9101 template_count
, conceptp
* 8);
9103 return decl
!= error_mark_node
? decl
: NULL_TREE
;
9106 /* Create and return a canonical pointer to member function type, for
9107 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
9110 build_ptrmemfunc_type (tree type
)
9115 if (type
== error_mark_node
)
9118 /* Make sure that we always have the unqualified pointer-to-member
9120 if (cp_cv_quals quals
= cp_type_quals (type
))
9122 tree unqual
= build_ptrmemfunc_type (TYPE_MAIN_VARIANT (type
));
9123 return cp_build_qualified_type (unqual
, quals
);
9126 /* If a canonical type already exists for this type, use it. We use
9127 this method instead of type_hash_canon, because it only does a
9128 simple equality check on the list of field members. */
9130 t
= TYPE_PTRMEMFUNC_TYPE (type
);
9134 t
= make_node (RECORD_TYPE
);
9136 /* Let the front end know this is a pointer to member function. */
9137 TYPE_PTRMEMFUNC_FLAG (t
) = 1;
9139 field
= build_decl (input_location
, FIELD_DECL
, pfn_identifier
, type
);
9142 field
= build_decl (input_location
, FIELD_DECL
, delta_identifier
,
9144 DECL_CHAIN (field
) = fields
;
9147 finish_builtin_struct (t
, "__ptrmemfunc_type", fields
, ptr_type_node
);
9149 /* Zap out the name so that the back end will give us the debugging
9150 information for this anonymous RECORD_TYPE. */
9151 TYPE_NAME (t
) = NULL_TREE
;
9153 /* Cache this pointer-to-member type so that we can find it again
9155 TYPE_PTRMEMFUNC_TYPE (type
) = t
;
9157 if (TYPE_STRUCTURAL_EQUALITY_P (type
))
9158 SET_TYPE_STRUCTURAL_EQUALITY (t
);
9159 else if (TYPE_CANONICAL (type
) != type
)
9160 TYPE_CANONICAL (t
) = build_ptrmemfunc_type (TYPE_CANONICAL (type
));
9165 /* Create and return a pointer to data member type. */
9168 build_ptrmem_type (tree class_type
, tree member_type
)
9170 if (TREE_CODE (member_type
) == METHOD_TYPE
)
9172 cp_cv_quals quals
= type_memfn_quals (member_type
);
9173 cp_ref_qualifier rqual
= type_memfn_rqual (member_type
);
9174 member_type
= build_memfn_type (member_type
, class_type
, quals
, rqual
);
9175 return build_ptrmemfunc_type (build_pointer_type (member_type
));
9179 gcc_assert (TREE_CODE (member_type
) != FUNCTION_TYPE
);
9180 return build_offset_type (class_type
, member_type
);
9184 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
9185 Check to see that the definition is valid. Issue appropriate error
9186 messages. Return 1 if the definition is particularly bad, or 0
9190 check_static_variable_definition (tree decl
, tree type
)
9192 /* Avoid redundant diagnostics on out-of-class definitions. */
9193 if (!current_class_type
|| !TYPE_BEING_DEFINED (current_class_type
))
9195 /* Can't check yet if we don't know the type. */
9196 if (dependent_type_p (type
))
9198 /* If DECL is declared constexpr, we'll do the appropriate checks
9199 in check_initializer. Similarly for inline static data members. */
9201 && (DECL_DECLARED_CONSTEXPR_P (decl
)
9202 || DECL_VAR_DECLARED_INLINE_P (decl
)))
9204 else if (cxx_dialect
>= cxx11
&& !INTEGRAL_OR_ENUMERATION_TYPE_P (type
))
9206 if (!COMPLETE_TYPE_P (type
))
9207 error_at (DECL_SOURCE_LOCATION (decl
),
9208 "in-class initialization of static data member %q#D of "
9209 "incomplete type", decl
);
9210 else if (literal_type_p (type
))
9211 permerror (DECL_SOURCE_LOCATION (decl
),
9212 "%<constexpr%> needed for in-class initialization of "
9213 "static data member %q#D of non-integral type", decl
);
9215 error_at (DECL_SOURCE_LOCATION (decl
),
9216 "in-class initialization of static data member %q#D of "
9217 "non-literal type", decl
);
9221 /* Motion 10 at San Diego: If a static const integral data member is
9222 initialized with an integral constant expression, the initializer
9223 may appear either in the declaration (within the class), or in
9224 the definition, but not both. If it appears in the class, the
9225 member is a member constant. The file-scope definition is always
9227 if (!ARITHMETIC_TYPE_P (type
) && TREE_CODE (type
) != ENUMERAL_TYPE
)
9229 error_at (DECL_SOURCE_LOCATION (decl
),
9230 "invalid in-class initialization of static data member "
9231 "of non-integral type %qT",
9235 else if (!CP_TYPE_CONST_P (type
))
9236 error_at (DECL_SOURCE_LOCATION (decl
),
9237 "ISO C++ forbids in-class initialization of non-const "
9238 "static member %qD",
9240 else if (!INTEGRAL_OR_ENUMERATION_TYPE_P (type
))
9241 pedwarn (DECL_SOURCE_LOCATION (decl
), OPT_Wpedantic
,
9242 "ISO C++ forbids initialization of member constant "
9243 "%qD of non-integral type %qT", decl
, type
);
9248 /* *expr_p is part of the TYPE_SIZE of a variably-sized array. If any
9249 SAVE_EXPRs in *expr_p wrap expressions with side-effects, break those
9250 expressions out into temporary variables so that walk_tree doesn't
9251 step into them (c++/15764). */
9254 stabilize_save_expr_r (tree
*expr_p
, int *walk_subtrees
, void *data
)
9256 hash_set
<tree
> *pset
= (hash_set
<tree
> *)data
;
9257 tree expr
= *expr_p
;
9258 if (TREE_CODE (expr
) == SAVE_EXPR
)
9260 tree op
= TREE_OPERAND (expr
, 0);
9261 cp_walk_tree (&op
, stabilize_save_expr_r
, data
, pset
);
9262 if (TREE_SIDE_EFFECTS (op
))
9263 TREE_OPERAND (expr
, 0) = get_temp_regvar (TREE_TYPE (op
), op
);
9266 else if (!EXPR_P (expr
) || !TREE_SIDE_EFFECTS (expr
))
9271 /* Entry point for the above. */
9274 stabilize_vla_size (tree size
)
9276 hash_set
<tree
> pset
;
9277 /* Break out any function calls into temporary variables. */
9278 cp_walk_tree (&size
, stabilize_save_expr_r
, &pset
, &pset
);
9281 /* Reduce a SIZEOF_EXPR to its value. */
9284 fold_sizeof_expr (tree t
)
9287 if (SIZEOF_EXPR_TYPE_P (t
))
9288 r
= cxx_sizeof_or_alignof_type (TREE_TYPE (TREE_OPERAND (t
, 0)),
9289 SIZEOF_EXPR
, false);
9290 else if (TYPE_P (TREE_OPERAND (t
, 0)))
9291 r
= cxx_sizeof_or_alignof_type (TREE_OPERAND (t
, 0), SIZEOF_EXPR
,
9294 r
= cxx_sizeof_or_alignof_expr (TREE_OPERAND (t
, 0), SIZEOF_EXPR
,
9296 if (r
== error_mark_node
)
9301 /* Given the SIZE (i.e., number of elements) in an array, compute
9302 an appropriate index type for the array. If non-NULL, NAME is
9303 the name of the entity being declared. */
9306 compute_array_index_type (tree name
, tree size
, tsubst_flags_t complain
)
9311 if (error_operand_p (size
))
9312 return error_mark_node
;
9314 if (!type_dependent_expression_p (size
))
9316 tree type
= TREE_TYPE (size
);
9318 size
= mark_rvalue_use (size
);
9320 if (cxx_dialect
< cxx11
&& TREE_CODE (size
) == NOP_EXPR
9321 && TREE_SIDE_EFFECTS (size
))
9322 /* In C++98, we mark a non-constant array bound with a magic
9323 NOP_EXPR with TREE_SIDE_EFFECTS; don't fold in that case. */;
9326 size
= instantiate_non_dependent_expr_sfinae (size
, complain
);
9328 if (CLASS_TYPE_P (type
)
9329 && CLASSTYPE_LITERAL_P (type
))
9331 size
= build_expr_type_conversion (WANT_INT
, size
, true);
9334 if (!(complain
& tf_error
))
9335 return error_mark_node
;
9337 error ("size of array %qD has non-integral type %qT",
9340 error ("size of array has non-integral type %qT", type
);
9341 size
= integer_one_node
;
9343 if (size
== error_mark_node
)
9344 return error_mark_node
;
9345 type
= TREE_TYPE (size
);
9348 if (INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type
))
9349 size
= maybe_constant_value (size
);
9351 if (!TREE_CONSTANT (size
))
9355 if (error_operand_p (size
))
9356 return error_mark_node
;
9358 /* The array bound must be an integer type. */
9359 if (!INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type
))
9361 if (!(complain
& tf_error
))
9362 return error_mark_node
;
9364 error ("size of array %qD has non-integral type %qT", name
, type
);
9366 error ("size of array has non-integral type %qT", type
);
9367 size
= integer_one_node
;
9368 type
= TREE_TYPE (size
);
9372 /* A type is dependent if it is...an array type constructed from any
9373 dependent type or whose size is specified by a constant expression
9374 that is value-dependent. */
9375 /* We can only call value_dependent_expression_p on integral constant
9376 expressions; treat non-constant expressions as dependent, too. */
9377 if (processing_template_decl
9378 && (type_dependent_expression_p (size
)
9379 || !TREE_CONSTANT (size
) || value_dependent_expression_p (size
)))
9381 /* We cannot do any checking for a SIZE that isn't known to be
9382 constant. Just build the index type and mark that it requires
9383 structural equality checks. */
9384 itype
= build_index_type (build_min (MINUS_EXPR
, sizetype
,
9385 size
, size_one_node
));
9386 TYPE_DEPENDENT_P (itype
) = 1;
9387 TYPE_DEPENDENT_P_VALID (itype
) = 1;
9388 SET_TYPE_STRUCTURAL_EQUALITY (itype
);
9392 if (TREE_CODE (size
) != INTEGER_CST
)
9394 tree folded
= cp_fully_fold (size
);
9395 if (TREE_CODE (folded
) == INTEGER_CST
)
9396 pedwarn (location_of (size
), OPT_Wpedantic
,
9397 "size of array is not an integral constant-expression");
9398 /* Use the folded result for VLAs, too; it will have resolved
9403 /* Normally, the array-bound will be a constant. */
9404 if (TREE_CODE (size
) == INTEGER_CST
)
9406 /* Check to see if the array bound overflowed. Make that an
9407 error, no matter how generous we're being. */
9408 constant_expression_error (size
);
9410 /* An array must have a positive number of elements. */
9411 if (tree_int_cst_lt (size
, integer_zero_node
))
9413 if (!(complain
& tf_error
))
9414 return error_mark_node
;
9416 error ("size of array %qD is negative", name
);
9418 error ("size of array is negative");
9419 size
= integer_one_node
;
9421 /* As an extension we allow zero-sized arrays. */
9422 else if (integer_zerop (size
))
9424 if (!(complain
& tf_error
))
9425 /* We must fail if performing argument deduction (as
9426 indicated by the state of complain), so that
9427 another substitution can be found. */
9428 return error_mark_node
;
9429 else if (in_system_header_at (input_location
))
9430 /* Allow them in system headers because glibc uses them. */;
9432 pedwarn (input_location
, OPT_Wpedantic
, "ISO C++ forbids zero-size array %qD", name
);
9434 pedwarn (input_location
, OPT_Wpedantic
, "ISO C++ forbids zero-size array");
9437 else if (TREE_CONSTANT (size
)
9438 /* We don't allow VLAs at non-function scopes, or during
9439 tentative template substitution. */
9440 || !at_function_scope_p ()
9441 || !(complain
& tf_error
))
9443 if (!(complain
& tf_error
))
9444 return error_mark_node
;
9445 /* `(int) &fn' is not a valid array bound. */
9447 error ("size of array %qD is not an integral constant-expression",
9450 error ("size of array is not an integral constant-expression");
9451 size
= integer_one_node
;
9453 else if (pedantic
&& warn_vla
!= 0)
9456 pedwarn (input_location
, OPT_Wvla
, "ISO C++ forbids variable length array %qD", name
);
9458 pedwarn (input_location
, OPT_Wvla
, "ISO C++ forbids variable length array");
9460 else if (warn_vla
> 0)
9464 "variable length array %qD is used", name
);
9467 "variable length array is used");
9470 if (processing_template_decl
&& !TREE_CONSTANT (size
))
9471 /* A variable sized array. */
9472 itype
= build_min (MINUS_EXPR
, sizetype
, size
, integer_one_node
);
9475 /* Compute the index of the largest element in the array. It is
9476 one less than the number of elements in the array. We save
9477 and restore PROCESSING_TEMPLATE_DECL so that computations in
9478 cp_build_binary_op will be appropriately folded. */
9480 processing_template_decl_sentinel s
;
9481 itype
= cp_build_binary_op (input_location
,
9483 cp_convert (ssizetype
, size
, complain
),
9484 cp_convert (ssizetype
, integer_one_node
,
9487 itype
= maybe_constant_value (itype
);
9490 if (!TREE_CONSTANT (itype
))
9492 /* A variable sized array. */
9493 itype
= variable_size (itype
);
9495 stabilize_vla_size (itype
);
9497 if (sanitize_flags_p (SANITIZE_VLA
)
9498 && current_function_decl
!= NULL_TREE
)
9500 /* We have to add 1 -- in the ubsan routine we generate
9501 LE_EXPR rather than LT_EXPR. */
9502 tree t
= fold_build2 (PLUS_EXPR
, TREE_TYPE (itype
), itype
,
9503 build_one_cst (TREE_TYPE (itype
)));
9504 t
= ubsan_instrument_vla (input_location
, t
);
9505 finish_expr_stmt (t
);
9508 /* Make sure that there was no overflow when creating to a signed
9509 index type. (For example, on a 32-bit machine, an array with
9510 size 2^32 - 1 is too big.) */
9511 else if (TREE_CODE (itype
) == INTEGER_CST
9512 && TREE_OVERFLOW (itype
))
9514 if (!(complain
& tf_error
))
9515 return error_mark_node
;
9516 error ("overflow in array dimension");
9517 TREE_OVERFLOW (itype
) = 0;
9521 /* Create and return the appropriate index type. */
9522 itype
= build_index_type (itype
);
9524 /* If the index type were dependent, we would have returned early, so
9525 remember that it isn't. */
9526 TYPE_DEPENDENT_P (itype
) = 0;
9527 TYPE_DEPENDENT_P_VALID (itype
) = 1;
9531 /* Returns the scope (if any) in which the entity declared by
9532 DECLARATOR will be located. If the entity was declared with an
9533 unqualified name, NULL_TREE is returned. */
9536 get_scope_of_declarator (const cp_declarator
*declarator
)
9538 while (declarator
&& declarator
->kind
!= cdk_id
)
9539 declarator
= declarator
->declarator
;
9541 /* If the declarator-id is a SCOPE_REF, the scope in which the
9542 declaration occurs is the first operand. */
9544 && declarator
->u
.id
.qualifying_scope
)
9545 return declarator
->u
.id
.qualifying_scope
;
9547 /* Otherwise, the declarator is not a qualified name; the entity will
9548 be declared in the current scope. */
9552 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
9553 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
9557 create_array_type_for_decl (tree name
, tree type
, tree size
)
9559 tree itype
= NULL_TREE
;
9561 /* If things have already gone awry, bail now. */
9562 if (type
== error_mark_node
|| size
== error_mark_node
)
9563 return error_mark_node
;
9565 /* 8.3.4/1: If the type of the identifier of D contains the auto
9566 type-specifier, the program is ill-formed. */
9567 if (type_uses_auto (type
))
9569 error ("%qD declared as array of %qT", name
, type
);
9570 return error_mark_node
;
9573 /* If there are some types which cannot be array elements,
9574 issue an error-message and return. */
9575 switch (TREE_CODE (type
))
9579 error ("declaration of %qD as array of void", name
);
9581 error ("creating array of void");
9582 return error_mark_node
;
9586 error ("declaration of %qD as array of functions", name
);
9588 error ("creating array of functions");
9589 return error_mark_node
;
9591 case REFERENCE_TYPE
:
9593 error ("declaration of %qD as array of references", name
);
9595 error ("creating array of references");
9596 return error_mark_node
;
9600 error ("declaration of %qD as array of function members", name
);
9602 error ("creating array of function members");
9603 return error_mark_node
;
9611 The constant expressions that specify the bounds of the arrays
9612 can be omitted only for the first member of the sequence. */
9613 if (TREE_CODE (type
) == ARRAY_TYPE
&& !TYPE_DOMAIN (type
))
9616 error ("declaration of %qD as multidimensional array must "
9617 "have bounds for all dimensions except the first",
9620 error ("multidimensional array must have bounds for all "
9621 "dimensions except the first");
9623 return error_mark_node
;
9626 /* Figure out the index type for the array. */
9628 itype
= compute_array_index_type (name
, size
, tf_warning_or_error
);
9631 T is called the array element type; this type shall not be [...] an
9632 abstract class type. */
9633 abstract_virtuals_error (name
, type
);
9635 return build_cplus_array_type (type
, itype
);
9638 /* Returns the smallest location != UNKNOWN_LOCATION among the
9639 three stored in LOCATIONS[ds_const], LOCATIONS[ds_volatile],
9640 and LOCATIONS[ds_restrict]. */
9643 smallest_type_quals_location (int type_quals
, const location_t
* locations
)
9645 location_t loc
= UNKNOWN_LOCATION
;
9647 if (type_quals
& TYPE_QUAL_CONST
)
9648 loc
= locations
[ds_const
];
9650 if ((type_quals
& TYPE_QUAL_VOLATILE
)
9651 && (loc
== UNKNOWN_LOCATION
|| locations
[ds_volatile
] < loc
))
9652 loc
= locations
[ds_volatile
];
9654 if ((type_quals
& TYPE_QUAL_RESTRICT
)
9655 && (loc
== UNKNOWN_LOCATION
|| locations
[ds_restrict
] < loc
))
9656 loc
= locations
[ds_restrict
];
9661 /* Check that it's OK to declare a function with the indicated TYPE
9662 and TYPE_QUALS. SFK indicates the kind of special function (if any)
9663 that this function is. OPTYPE is the type given in a conversion
9664 operator declaration, or the class type for a constructor/destructor.
9665 Returns the actual return type of the function; that may be different
9666 than TYPE if an error occurs, or for certain special functions. */
9669 check_special_function_return_type (special_function_kind sfk
,
9673 const location_t
* locations
)
9677 case sfk_constructor
:
9679 error ("return type specification for constructor invalid");
9680 else if (type_quals
!= TYPE_UNQUALIFIED
)
9681 error_at (smallest_type_quals_location (type_quals
, locations
),
9682 "qualifiers are not allowed on constructor declaration");
9684 if (targetm
.cxx
.cdtor_returns_this ())
9685 type
= build_pointer_type (optype
);
9687 type
= void_type_node
;
9690 case sfk_destructor
:
9692 error ("return type specification for destructor invalid");
9693 else if (type_quals
!= TYPE_UNQUALIFIED
)
9694 error_at (smallest_type_quals_location (type_quals
, locations
),
9695 "qualifiers are not allowed on destructor declaration");
9697 /* We can't use the proper return type here because we run into
9698 problems with ambiguous bases and covariant returns. */
9699 if (targetm
.cxx
.cdtor_returns_this ())
9700 type
= build_pointer_type (void_type_node
);
9702 type
= void_type_node
;
9705 case sfk_conversion
:
9707 error ("return type specified for %<operator %T%>", optype
);
9708 else if (type_quals
!= TYPE_UNQUALIFIED
)
9709 error_at (smallest_type_quals_location (type_quals
, locations
),
9710 "qualifiers are not allowed on declaration of "
9711 "%<operator %T%>", optype
);
9716 case sfk_deduction_guide
:
9718 error ("return type specified for deduction guide");
9719 else if (type_quals
!= TYPE_UNQUALIFIED
)
9720 error_at (smallest_type_quals_location (type_quals
, locations
),
9721 "qualifiers are not allowed on declaration of "
9723 type
= make_template_placeholder (CLASSTYPE_TI_TEMPLATE (optype
));
9724 for (int i
= 0; i
< ds_last
; ++i
)
9725 if (i
!= ds_explicit
&& locations
[i
])
9726 error_at (locations
[i
],
9727 "decl-specifier in declaration of deduction guide");
9737 /* A variable or data member (whose unqualified name is IDENTIFIER)
9738 has been declared with the indicated TYPE. If the TYPE is not
9739 acceptable, issue an error message and return a type to use for
9740 error-recovery purposes. */
9743 check_var_type (tree identifier
, tree type
)
9745 if (VOID_TYPE_P (type
))
9748 error ("unnamed variable or field declared void");
9749 else if (identifier_p (identifier
))
9751 gcc_assert (!IDENTIFIER_ANY_OP_P (identifier
));
9752 error ("variable or field %qE declared void", identifier
);
9755 error ("variable or field declared void");
9756 type
= error_mark_node
;
9762 /* Handle declaring DECL as an inline variable. */
9765 mark_inline_variable (tree decl
)
9767 bool inlinep
= true;
9768 if (! toplevel_bindings_p ())
9770 error ("%<inline%> specifier invalid for variable "
9771 "%qD declared at block scope", decl
);
9774 else if (cxx_dialect
< cxx17
)
9775 pedwarn (DECL_SOURCE_LOCATION (decl
), 0,
9776 "inline variables are only available "
9777 "with -std=c++17 or -std=gnu++17");
9780 retrofit_lang_decl (decl
);
9781 SET_DECL_VAR_DECLARED_INLINE_P (decl
);
9786 /* Assign a typedef-given name to a class or enumeration type declared
9787 as anonymous at first. This was split out of grokdeclarator
9788 because it is also used in libcc1. */
9791 name_unnamed_type (tree type
, tree decl
)
9793 gcc_assert (TYPE_UNNAMED_P (type
));
9795 /* Replace the anonymous name with the real name everywhere. */
9796 for (tree t
= TYPE_MAIN_VARIANT (type
); t
; t
= TYPE_NEXT_VARIANT (t
))
9798 if (anon_aggrname_p (TYPE_IDENTIFIER (t
)))
9799 /* We do not rename the debug info representing the
9800 unnamed tagged type because the standard says in
9801 [dcl.typedef] that the naming applies only for
9802 linkage purposes. */
9803 /*debug_hooks->set_name (t, decl);*/
9804 TYPE_NAME (t
) = decl
;
9807 if (TYPE_LANG_SPECIFIC (type
))
9808 TYPE_WAS_UNNAMED (type
) = 1;
9810 /* If this is a typedef within a template class, the nested
9811 type is a (non-primary) template. The name for the
9812 template needs updating as well. */
9813 if (TYPE_LANG_SPECIFIC (type
) && CLASSTYPE_TEMPLATE_INFO (type
))
9814 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type
))
9815 = TYPE_IDENTIFIER (type
);
9817 /* Adjust linkage now that we aren't unnamed anymore. */
9818 reset_type_linkage (type
);
9820 /* FIXME remangle member functions; member functions of a
9821 type with external linkage have external linkage. */
9823 /* Check that our job is done, and that it would fail if we
9824 attempted to do it again. */
9825 gcc_assert (!TYPE_UNNAMED_P (type
));
9828 /* Given declspecs and a declarator (abstract or otherwise), determine
9829 the name and type of the object declared and construct a DECL node
9832 DECLSPECS points to the representation of declaration-specifier
9833 sequence that precedes declarator.
9835 DECL_CONTEXT says which syntactic context this declaration is in:
9836 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
9837 FUNCDEF for a function definition. Like NORMAL but a few different
9838 error messages in each case. Return value may be zero meaning
9839 this definition is too screwy to try to parse.
9840 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
9841 handle member functions (which have FIELD context).
9842 Return value may be zero meaning this definition is too screwy to
9844 PARM for a parameter declaration (either within a function prototype
9845 or before a function body). Make a PARM_DECL, or return void_type_node.
9846 TPARM for a template parameter declaration.
9847 CATCHPARM for a parameter declaration before a catch clause.
9848 TYPENAME if for a typename (in a cast or sizeof).
9849 Don't make a DECL node; just return the ..._TYPE node.
9850 FIELD for a struct or union field; make a FIELD_DECL.
9851 BITFIELD for a field with specified width.
9853 INITIALIZED is as for start_decl.
9855 ATTRLIST is a pointer to the list of attributes, which may be NULL
9856 if there are none; *ATTRLIST may be modified if attributes from inside
9857 the declarator should be applied to the declaration.
9859 When this function is called, scoping variables (such as
9860 CURRENT_CLASS_TYPE) should reflect the scope in which the
9861 declaration occurs, not the scope in which the new declaration will
9862 be placed. For example, on:
9866 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
9869 Returns a DECL (if a declarator is present), a TYPE (if there is no
9870 declarator, in cases like "struct S;"), or the ERROR_MARK_NODE if an
9874 grokdeclarator (const cp_declarator
*declarator
,
9875 cp_decl_specifier_seq
*declspecs
,
9876 enum decl_context decl_context
,
9880 tree type
= NULL_TREE
;
9882 int explicit_intN
= 0;
9883 int virtualp
, explicitp
, friendp
, inlinep
, staticp
;
9884 int explicit_int
= 0;
9885 int explicit_char
= 0;
9886 int defaulted_int
= 0;
9888 tree typedef_decl
= NULL_TREE
;
9889 const char *name
= NULL
;
9890 tree typedef_type
= NULL_TREE
;
9891 /* True if this declarator is a function definition. */
9892 bool funcdef_flag
= false;
9893 cp_declarator_kind innermost_code
= cdk_error
;
9896 /* See the code below that used this. */
9897 tree decl_attr
= NULL_TREE
;
9900 /* Keep track of what sort of function is being processed
9901 so that we can warn about default return values, or explicit
9902 return values which do not match prescribed defaults. */
9903 special_function_kind sfk
= sfk_none
;
9905 tree dname
= NULL_TREE
;
9906 tree ctor_return_type
= NULL_TREE
;
9907 enum overload_flags flags
= NO_SPECIAL
;
9908 /* cv-qualifiers that apply to the declarator, for a declaration of
9909 a member function. */
9910 cp_cv_quals memfn_quals
= TYPE_UNQUALIFIED
;
9911 /* virt-specifiers that apply to the declarator, for a declaration of
9912 a member function. */
9913 cp_virt_specifiers virt_specifiers
= VIRT_SPEC_UNSPECIFIED
;
9914 /* ref-qualifier that applies to the declarator, for a declaration of
9915 a member function. */
9916 cp_ref_qualifier rqual
= REF_QUAL_NONE
;
9917 /* cv-qualifiers that apply to the type specified by the DECLSPECS. */
9918 int type_quals
= TYPE_UNQUALIFIED
;
9919 tree raises
= NULL_TREE
;
9920 int template_count
= 0;
9921 tree returned_attrs
= NULL_TREE
;
9922 tree parms
= NULL_TREE
;
9923 const cp_declarator
*id_declarator
;
9924 /* The unqualified name of the declarator; either an
9925 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
9926 tree unqualified_id
;
9927 /* The class type, if any, in which this entity is located,
9928 or NULL_TREE if none. Note that this value may be different from
9929 the current class type; for example if an attempt is made to declare
9930 "A::f" inside "B", this value will be "A". */
9931 tree ctype
= current_class_type
;
9932 /* The NAMESPACE_DECL for the namespace in which this entity is
9933 located. If an unqualified name is used to declare the entity,
9934 this value will be NULL_TREE, even if the entity is located at
9936 tree in_namespace
= NULL_TREE
;
9937 cp_storage_class storage_class
;
9938 bool unsigned_p
, signed_p
, short_p
, long_p
, thread_p
;
9939 bool type_was_error_mark_node
= false;
9940 bool parameter_pack_p
= declarator
? declarator
->parameter_pack_p
: false;
9941 bool template_type_arg
= false;
9942 bool template_parm_flag
= false;
9943 bool typedef_p
= decl_spec_seq_has_spec_p (declspecs
, ds_typedef
);
9944 bool constexpr_p
= decl_spec_seq_has_spec_p (declspecs
, ds_constexpr
);
9945 bool late_return_type_p
= false;
9946 bool array_parameter_p
= false;
9947 source_location saved_loc
= input_location
;
9948 tree reqs
= NULL_TREE
;
9950 signed_p
= decl_spec_seq_has_spec_p (declspecs
, ds_signed
);
9951 unsigned_p
= decl_spec_seq_has_spec_p (declspecs
, ds_unsigned
);
9952 short_p
= decl_spec_seq_has_spec_p (declspecs
, ds_short
);
9953 long_p
= decl_spec_seq_has_spec_p (declspecs
, ds_long
);
9954 longlong
= decl_spec_seq_has_spec_p (declspecs
, ds_long_long
);
9955 explicit_intN
= declspecs
->explicit_intN_p
;
9956 thread_p
= decl_spec_seq_has_spec_p (declspecs
, ds_thread
);
9958 // Was concept_p specified? Note that ds_concept
9959 // implies ds_constexpr!
9960 bool concept_p
= decl_spec_seq_has_spec_p (declspecs
, ds_concept
);
9964 if (decl_spec_seq_has_spec_p (declspecs
, ds_const
))
9965 type_quals
|= TYPE_QUAL_CONST
;
9966 if (decl_spec_seq_has_spec_p (declspecs
, ds_volatile
))
9967 type_quals
|= TYPE_QUAL_VOLATILE
;
9968 if (decl_spec_seq_has_spec_p (declspecs
, ds_restrict
))
9969 type_quals
|= TYPE_QUAL_RESTRICT
;
9971 if (decl_context
== FUNCDEF
)
9972 funcdef_flag
= true, decl_context
= NORMAL
;
9973 else if (decl_context
== MEMFUNCDEF
)
9974 funcdef_flag
= true, decl_context
= FIELD
;
9975 else if (decl_context
== BITFIELD
)
9976 bitfield
= 1, decl_context
= FIELD
;
9977 else if (decl_context
== TEMPLATE_TYPE_ARG
)
9978 template_type_arg
= true, decl_context
= TYPENAME
;
9979 else if (decl_context
== TPARM
)
9980 template_parm_flag
= true, decl_context
= PARM
;
9982 if (initialized
> 1)
9983 funcdef_flag
= true;
9985 location_t typespec_loc
= smallest_type_quals_location (type_quals
,
9986 declspecs
->locations
);
9987 if (typespec_loc
== UNKNOWN_LOCATION
)
9988 typespec_loc
= declspecs
->locations
[ds_type_spec
];
9989 if (typespec_loc
== UNKNOWN_LOCATION
)
9990 typespec_loc
= input_location
;
9992 /* Look inside a declarator for the name being declared
9993 and get it as a string, for an error message. */
9994 for (id_declarator
= declarator
;
9996 id_declarator
= id_declarator
->declarator
)
9998 if (id_declarator
->kind
!= cdk_id
)
9999 innermost_code
= id_declarator
->kind
;
10001 switch (id_declarator
->kind
)
10004 if (id_declarator
->declarator
10005 && id_declarator
->declarator
->kind
== cdk_id
)
10007 sfk
= id_declarator
->declarator
->u
.id
.sfk
;
10008 if (sfk
== sfk_destructor
)
10015 tree qualifying_scope
= id_declarator
->u
.id
.qualifying_scope
;
10016 tree decl
= id_declarator
->u
.id
.unqualified_name
;
10019 if (qualifying_scope
)
10021 if (at_function_scope_p ())
10025 A declarator-id shall not be qualified except
10028 None of the cases are permitted in block
10030 if (qualifying_scope
== global_namespace
)
10031 error ("invalid use of qualified-name %<::%D%>",
10033 else if (TYPE_P (qualifying_scope
))
10034 error ("invalid use of qualified-name %<%T::%D%>",
10035 qualifying_scope
, decl
);
10037 error ("invalid use of qualified-name %<%D::%D%>",
10038 qualifying_scope
, decl
);
10039 return error_mark_node
;
10041 else if (TYPE_P (qualifying_scope
))
10043 ctype
= qualifying_scope
;
10044 if (!MAYBE_CLASS_TYPE_P (ctype
))
10046 error ("%q#T is not a class or a namespace", ctype
);
10049 else if (innermost_code
!= cdk_function
10050 && current_class_type
10051 && !uniquely_derived_from_p (ctype
,
10052 current_class_type
))
10054 error ("invalid use of qualified-name %<%T::%D%>",
10055 qualifying_scope
, decl
);
10056 return error_mark_node
;
10059 else if (TREE_CODE (qualifying_scope
) == NAMESPACE_DECL
)
10060 in_namespace
= qualifying_scope
;
10062 switch (TREE_CODE (decl
))
10066 if (innermost_code
!= cdk_function
)
10068 error ("declaration of %qD as non-function", decl
);
10069 return error_mark_node
;
10071 else if (!qualifying_scope
10072 && !(current_class_type
&& at_class_scope_p ()))
10074 error ("declaration of %qD as non-member", decl
);
10075 return error_mark_node
;
10078 tree type
= TREE_OPERAND (decl
, 0);
10080 type
= constructor_name (type
);
10081 name
= identifier_to_locale (IDENTIFIER_POINTER (type
));
10086 case TEMPLATE_ID_EXPR
:
10088 tree fns
= TREE_OPERAND (decl
, 0);
10091 if (!identifier_p (dname
))
10092 dname
= OVL_NAME (dname
);
10094 /* Fall through. */
10096 case IDENTIFIER_NODE
:
10097 if (identifier_p (decl
))
10100 if (IDENTIFIER_KEYWORD_P (dname
))
10102 error ("declarator-id missing; using reserved word %qD",
10104 name
= identifier_to_locale (IDENTIFIER_POINTER (dname
));
10106 else if (!IDENTIFIER_CONV_OP_P (dname
))
10107 name
= identifier_to_locale (IDENTIFIER_POINTER (dname
));
10110 gcc_assert (flags
== NO_SPECIAL
);
10111 flags
= TYPENAME_FLAG
;
10112 sfk
= sfk_conversion
;
10113 tree glob
= get_global_binding (dname
);
10114 if (glob
&& TREE_CODE (glob
) == TYPE_DECL
)
10115 name
= identifier_to_locale (IDENTIFIER_POINTER (dname
));
10117 name
= "<invalid operator>";
10122 gcc_unreachable ();
10129 case cdk_reference
:
10134 name
= "structured binding";
10138 return error_mark_node
;
10141 gcc_unreachable ();
10143 if (id_declarator
->kind
== cdk_id
)
10149 The declarator in a function-definition shall have the form
10150 D1 ( parameter-declaration-clause) ... */
10151 if (funcdef_flag
&& innermost_code
!= cdk_function
)
10153 error ("function definition does not declare parameters");
10154 return error_mark_node
;
10157 if (flags
== TYPENAME_FLAG
10158 && innermost_code
!= cdk_function
10159 && ! (ctype
&& !declspecs
->any_specifiers_p
))
10161 error ("declaration of %qD as non-function", dname
);
10162 return error_mark_node
;
10165 if (dname
&& identifier_p (dname
))
10167 if (UDLIT_OPER_P (dname
)
10168 && innermost_code
!= cdk_function
)
10170 error ("declaration of %qD as non-function", dname
);
10171 return error_mark_node
;
10174 if (IDENTIFIER_ANY_OP_P (dname
))
10178 error ("declaration of %qD as %<typedef%>", dname
);
10179 return error_mark_node
;
10181 else if (decl_context
== PARM
|| decl_context
== CATCHPARM
)
10183 error ("declaration of %qD as parameter", dname
);
10184 return error_mark_node
;
10189 /* Anything declared one level down from the top level
10190 must be one of the parameters of a function
10191 (because the body is at least two levels down). */
10193 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
10194 by not allowing C++ class definitions to specify their parameters
10195 with xdecls (must be spec.d in the parmlist).
10197 Since we now wait to push a class scope until we are sure that
10198 we are in a legitimate method context, we must set oldcname
10199 explicitly (since current_class_name is not yet alive).
10201 We also want to avoid calling this a PARM if it is in a namespace. */
10203 if (decl_context
== NORMAL
&& !toplevel_bindings_p ())
10205 cp_binding_level
*b
= current_binding_level
;
10206 current_binding_level
= b
->level_chain
;
10207 if (current_binding_level
!= 0 && toplevel_bindings_p ())
10208 decl_context
= PARM
;
10209 current_binding_level
= b
;
10213 name
= decl_context
== PARM
? "parameter" : "type name";
10215 if (concept_p
&& typedef_p
)
10217 error ("%<concept%> cannot appear in a typedef declaration");
10218 return error_mark_node
;
10221 if (constexpr_p
&& typedef_p
)
10223 error ("%<constexpr%> cannot appear in a typedef declaration");
10224 return error_mark_node
;
10227 /* If there were multiple types specified in the decl-specifier-seq,
10228 issue an error message. */
10229 if (declspecs
->multiple_types_p
)
10231 error ("two or more data types in declaration of %qs", name
);
10232 return error_mark_node
;
10235 if (declspecs
->conflicting_specifiers_p
)
10237 error ("conflicting specifiers in declaration of %qs", name
);
10238 return error_mark_node
;
10241 /* Extract the basic type from the decl-specifier-seq. */
10242 type
= declspecs
->type
;
10243 if (type
== error_mark_node
)
10246 type_was_error_mark_node
= true;
10248 /* If the entire declaration is itself tagged as deprecated then
10249 suppress reports of deprecated items. */
10250 if (type
&& TREE_DEPRECATED (type
)
10251 && deprecated_state
!= DEPRECATED_SUPPRESS
)
10252 warn_deprecated_use (type
, NULL_TREE
);
10253 if (type
&& TREE_CODE (type
) == TYPE_DECL
)
10255 typedef_decl
= type
;
10256 type
= TREE_TYPE (typedef_decl
);
10257 if (TREE_DEPRECATED (type
)
10258 && DECL_ARTIFICIAL (typedef_decl
)
10259 && deprecated_state
!= DEPRECATED_SUPPRESS
)
10260 warn_deprecated_use (type
, NULL_TREE
);
10262 /* No type at all: default to `int', and set DEFAULTED_INT
10263 because it was not a user-defined typedef. */
10264 if (type
== NULL_TREE
)
10266 if (signed_p
|| unsigned_p
|| long_p
|| short_p
)
10268 /* These imply 'int'. */
10269 type
= integer_type_node
;
10272 /* If we just have "complex", it is equivalent to "complex double". */
10273 else if (!longlong
&& !explicit_intN
10274 && decl_spec_seq_has_spec_p (declspecs
, ds_complex
))
10276 type
= double_type_node
;
10277 pedwarn (declspecs
->locations
[ds_complex
], OPT_Wpedantic
,
10278 "ISO C++ does not support plain %<complex%> meaning "
10279 "%<double complex%>");
10282 /* Gather flags. */
10283 explicit_int
= declspecs
->explicit_int_p
;
10284 explicit_char
= declspecs
->explicit_char_p
;
10287 /* See the code below that used this. */
10289 decl_attr
= DECL_ATTRIBUTES (typedef_decl
);
10291 typedef_type
= type
;
10293 if (sfk
== sfk_conversion
|| sfk
== sfk_deduction_guide
)
10294 ctor_return_type
= TREE_TYPE (dname
);
10296 ctor_return_type
= ctype
;
10298 if (sfk
!= sfk_none
)
10300 type
= check_special_function_return_type (sfk
, type
,
10303 declspecs
->locations
);
10304 type_quals
= TYPE_UNQUALIFIED
;
10306 else if (type
== NULL_TREE
)
10312 /* We handle `main' specially here, because 'main () { }' is so
10313 common. With no options, it is allowed. With -Wreturn-type,
10314 it is a warning. It is only an error with -pedantic-errors. */
10315 is_main
= (funcdef_flag
10316 && dname
&& identifier_p (dname
)
10317 && MAIN_NAME_P (dname
)
10318 && ctype
== NULL_TREE
10319 && in_namespace
== NULL_TREE
10320 && current_namespace
== global_namespace
);
10322 if (type_was_error_mark_node
)
10323 /* We've already issued an error, don't complain more. */;
10324 else if (in_system_header_at (input_location
) || flag_ms_extensions
)
10325 /* Allow it, sigh. */;
10326 else if (! is_main
)
10327 permerror (input_location
, "ISO C++ forbids declaration of %qs with no type", name
);
10329 pedwarn (input_location
, OPT_Wpedantic
,
10330 "ISO C++ forbids declaration of %qs with no type", name
);
10332 warning (OPT_Wreturn_type
,
10333 "ISO C++ forbids declaration of %qs with no type", name
);
10335 if (type_was_error_mark_node
&& template_parm_flag
)
10336 /* FIXME we should be able to propagate the error_mark_node as is
10337 for other contexts too. */
10338 type
= error_mark_node
;
10340 type
= integer_type_node
;
10347 if (! int_n_enabled_p
[declspecs
->int_n_idx
])
10349 error ("%<__int%d%> is not supported by this target",
10350 int_n_data
[declspecs
->int_n_idx
].bitsize
);
10351 explicit_intN
= false;
10353 else if (pedantic
&& ! in_system_header_at (input_location
))
10354 pedwarn (input_location
, OPT_Wpedantic
,
10355 "ISO C++ does not support %<__int%d%> for %qs",
10356 int_n_data
[declspecs
->int_n_idx
].bitsize
, name
);
10359 /* Now process the modifiers that were specified
10360 and check for invalid combinations. */
10362 /* Long double is a special combination. */
10363 if (long_p
&& !longlong
&& TYPE_MAIN_VARIANT (type
) == double_type_node
)
10366 type
= cp_build_qualified_type (long_double_type_node
,
10367 cp_type_quals (type
));
10370 /* Check all other uses of type modifiers. */
10372 if (unsigned_p
|| signed_p
|| long_p
|| short_p
)
10376 if ((signed_p
|| unsigned_p
) && TREE_CODE (type
) != INTEGER_TYPE
)
10377 error ("%<signed%> or %<unsigned%> invalid for %qs", name
);
10378 else if (signed_p
&& unsigned_p
)
10379 error ("%<signed%> and %<unsigned%> specified together for %qs", name
);
10380 else if (longlong
&& TREE_CODE (type
) != INTEGER_TYPE
)
10381 error ("%<long long%> invalid for %qs", name
);
10382 else if (long_p
&& TREE_CODE (type
) == REAL_TYPE
)
10383 error ("%<long%> invalid for %qs", name
);
10384 else if (short_p
&& TREE_CODE (type
) == REAL_TYPE
)
10385 error ("%<short%> invalid for %qs", name
);
10386 else if ((long_p
|| short_p
) && TREE_CODE (type
) != INTEGER_TYPE
)
10387 error ("%<long%> or %<short%> invalid for %qs", name
);
10388 else if ((long_p
|| short_p
|| explicit_char
|| explicit_int
) && explicit_intN
)
10389 error ("%<long%>, %<int%>, %<short%>, or %<char%> invalid for %qs", name
);
10390 else if ((long_p
|| short_p
) && explicit_char
)
10391 error ("%<long%> or %<short%> specified with char for %qs", name
);
10392 else if (long_p
&& short_p
)
10393 error ("%<long%> and %<short%> specified together for %qs", name
);
10394 else if (type
== char16_type_node
|| type
== char32_type_node
)
10396 if (signed_p
|| unsigned_p
)
10397 error ("%<signed%> or %<unsigned%> invalid for %qs", name
);
10398 else if (short_p
|| long_p
)
10399 error ("%<short%> or %<long%> invalid for %qs", name
);
10404 if (!explicit_int
&& !defaulted_int
&& !explicit_char
&& !explicit_intN
&& pedantic
)
10406 pedwarn (input_location
, OPT_Wpedantic
,
10407 "long, short, signed or unsigned used invalidly for %qs",
10409 if (flag_pedantic_errors
)
10414 /* Discard the type modifiers if they are invalid. */
10417 unsigned_p
= false;
10425 /* Decide whether an integer type is signed or not.
10426 Optionally treat bitfields as signed by default. */
10430 It is implementation-defined whether a plain (neither
10431 explicitly signed or unsigned) char, short, int, or long
10432 bit-field is signed or unsigned.
10434 Naturally, we extend this to long long as well. Note that
10435 this does not include wchar_t. */
10436 || (bitfield
&& !flag_signed_bitfields
10438 /* A typedef for plain `int' without `signed' can be
10439 controlled just like plain `int', but a typedef for
10440 `signed int' cannot be so controlled. */
10442 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl
))
10443 && TREE_CODE (type
) == INTEGER_TYPE
10444 && !same_type_p (TYPE_MAIN_VARIANT (type
), wchar_type_node
)))
10447 type
= int_n_trees
[declspecs
->int_n_idx
].unsigned_type
;
10449 type
= long_long_unsigned_type_node
;
10451 type
= long_unsigned_type_node
;
10453 type
= short_unsigned_type_node
;
10454 else if (type
== char_type_node
)
10455 type
= unsigned_char_type_node
;
10456 else if (typedef_decl
)
10457 type
= unsigned_type_for (type
);
10459 type
= unsigned_type_node
;
10461 else if (signed_p
&& type
== char_type_node
)
10462 type
= signed_char_type_node
;
10463 else if (explicit_intN
)
10464 type
= int_n_trees
[declspecs
->int_n_idx
].signed_type
;
10466 type
= long_long_integer_type_node
;
10468 type
= long_integer_type_node
;
10470 type
= short_integer_type_node
;
10472 if (decl_spec_seq_has_spec_p (declspecs
, ds_complex
))
10474 if (TREE_CODE (type
) != INTEGER_TYPE
&& TREE_CODE (type
) != REAL_TYPE
)
10475 error ("complex invalid for %qs", name
);
10476 /* If a modifier is specified, the resulting complex is the complex
10477 form of TYPE. E.g, "complex short" is "complex short int". */
10478 else if (type
== integer_type_node
)
10479 type
= complex_integer_type_node
;
10480 else if (type
== float_type_node
)
10481 type
= complex_float_type_node
;
10482 else if (type
== double_type_node
)
10483 type
= complex_double_type_node
;
10484 else if (type
== long_double_type_node
)
10485 type
= complex_long_double_type_node
;
10487 type
= build_complex_type (type
);
10490 /* If we're using the injected-class-name to form a compound type or a
10491 declaration, replace it with the underlying class so we don't get
10492 redundant typedefs in the debug output. But if we are returning the
10493 type unchanged, leave it alone so that it's available to
10494 maybe_get_template_decl_from_type_decl. */
10495 if (CLASS_TYPE_P (type
)
10496 && DECL_SELF_REFERENCE_P (TYPE_NAME (type
))
10497 && type
== TREE_TYPE (TYPE_NAME (type
))
10498 && (declarator
|| type_quals
))
10499 type
= DECL_ORIGINAL_TYPE (TYPE_NAME (type
));
10501 type_quals
|= cp_type_quals (type
);
10502 type
= cp_build_qualified_type_real
10503 (type
, type_quals
, ((((typedef_decl
&& !DECL_ARTIFICIAL (typedef_decl
))
10504 || declspecs
->decltype_p
)
10505 ? tf_ignore_bad_quals
: 0) | tf_warning_or_error
));
10506 /* We might have ignored or rejected some of the qualifiers. */
10507 type_quals
= cp_type_quals (type
);
10509 if (cxx_dialect
>= cxx17
&& type
&& is_auto (type
)
10510 && innermost_code
!= cdk_function
10511 && id_declarator
&& declarator
!= id_declarator
)
10512 if (tree tmpl
= CLASS_PLACEHOLDER_TEMPLATE (type
))
10514 error_at (typespec_loc
, "template placeholder type %qT must be followed "
10515 "by a simple declarator-id", type
);
10516 inform (DECL_SOURCE_LOCATION (tmpl
), "%qD declared here", tmpl
);
10520 inlinep
= decl_spec_seq_has_spec_p (declspecs
, ds_inline
);
10521 virtualp
= decl_spec_seq_has_spec_p (declspecs
, ds_virtual
);
10522 explicitp
= decl_spec_seq_has_spec_p (declspecs
, ds_explicit
);
10524 storage_class
= declspecs
->storage_class
;
10525 if (storage_class
== sc_static
)
10526 staticp
= 1 + (decl_context
== FIELD
);
10532 error ("member %qD cannot be declared both %<virtual%> "
10533 "and %<static%>", dname
);
10534 storage_class
= sc_none
;
10538 error ("member %qD cannot be declared both %<virtual%> "
10539 "and %<constexpr%>", dname
);
10541 friendp
= decl_spec_seq_has_spec_p (declspecs
, ds_friend
);
10543 /* Issue errors about use of storage classes for parameters. */
10544 if (decl_context
== PARM
)
10548 error ("typedef declaration invalid in parameter declaration");
10549 return error_mark_node
;
10551 else if (template_parm_flag
&& storage_class
!= sc_none
)
10553 error ("storage class specified for template parameter %qs", name
);
10554 return error_mark_node
;
10556 else if (storage_class
== sc_static
10557 || storage_class
== sc_extern
10559 error ("storage class specifiers invalid in parameter declarations");
10561 /* Function parameters cannot be concept. */
10563 error ("a parameter cannot be declared %<concept%>");
10564 /* Function parameters cannot be constexpr. If we saw one, moan
10565 and pretend it wasn't there. */
10566 else if (constexpr_p
)
10568 error ("a parameter cannot be declared %<constexpr%>");
10573 /* Give error if `virtual' is used outside of class declaration. */
10575 && (current_class_name
== NULL_TREE
|| decl_context
!= FIELD
))
10577 error_at (declspecs
->locations
[ds_virtual
],
10578 "%<virtual%> outside class declaration");
10582 if (innermost_code
== cdk_decomp
)
10584 location_t loc
= (declarator
->kind
== cdk_reference
10585 ? declarator
->declarator
->id_loc
: declarator
->id_loc
);
10587 error_at (declspecs
->locations
[ds_inline
],
10588 "structured binding declaration cannot be %<inline%>");
10590 error_at (declspecs
->locations
[ds_typedef
],
10591 "structured binding declaration cannot be %<typedef%>");
10593 error_at (declspecs
->locations
[ds_constexpr
], "structured "
10594 "binding declaration cannot be %<constexpr%>");
10596 error_at (declspecs
->locations
[ds_thread
],
10597 "structured binding declaration cannot be %qs",
10598 declspecs
->gnu_thread_keyword_p
10599 ? "__thread" : "thread_local");
10601 error_at (declspecs
->locations
[ds_concept
],
10602 "structured binding declaration cannot be %<concept%>");
10603 switch (storage_class
)
10608 error_at (loc
, "structured binding declaration cannot be "
10612 error_at (loc
, "structured binding declaration cannot be "
10616 error_at (loc
, "structured binding declaration cannot be "
10620 error_at (loc
, "structured binding declaration cannot be "
10624 error_at (loc
, "structured binding declaration cannot be "
10628 gcc_unreachable ();
10630 if (TREE_CODE (type
) != TEMPLATE_TYPE_PARM
10631 || TYPE_IDENTIFIER (type
) != auto_identifier
)
10633 if (type
!= error_mark_node
)
10635 error_at (loc
, "structured binding declaration cannot have "
10638 "type must be cv-qualified %<auto%> or reference to "
10639 "cv-qualified %<auto%>");
10641 type
= build_qualified_type (make_auto (), type_quals
);
10642 declspecs
->type
= type
;
10649 storage_class
= sc_none
;
10651 declspecs
->storage_class
= sc_none
;
10652 declspecs
->locations
[ds_thread
] = UNKNOWN_LOCATION
;
10655 /* Static anonymous unions are dealt with here. */
10656 if (staticp
&& decl_context
== TYPENAME
10658 && ANON_AGGR_TYPE_P (declspecs
->type
))
10659 decl_context
= FIELD
;
10661 /* Warn about storage classes that are invalid for certain
10662 kinds of declarations (parameters, typenames, etc.). */
10665 && storage_class
!= sc_extern
10666 && storage_class
!= sc_static
)
10669 error ("multiple storage classes in declaration of %qs", name
);
10672 if (decl_context
!= NORMAL
10673 && ((storage_class
!= sc_none
10674 && storage_class
!= sc_mutable
)
10677 if ((decl_context
== PARM
|| decl_context
== CATCHPARM
)
10678 && (storage_class
== sc_register
10679 || storage_class
== sc_auto
))
10681 else if (typedef_p
)
10683 else if (decl_context
== FIELD
10684 /* C++ allows static class elements. */
10685 && storage_class
== sc_static
)
10686 /* C++ also allows inlines and signed and unsigned elements,
10687 but in those cases we don't come in here. */
10691 if (decl_context
== FIELD
)
10692 error ("storage class specified for %qs", name
);
10695 if (decl_context
== PARM
|| decl_context
== CATCHPARM
)
10696 error ("storage class specified for parameter %qs", name
);
10698 error ("storage class specified for typename");
10700 if (storage_class
== sc_register
10701 || storage_class
== sc_auto
10702 || storage_class
== sc_extern
10704 storage_class
= sc_none
;
10707 else if (storage_class
== sc_extern
&& funcdef_flag
10708 && ! toplevel_bindings_p ())
10709 error ("nested function %qs declared %<extern%>", name
);
10710 else if (toplevel_bindings_p ())
10712 if (storage_class
== sc_auto
)
10713 error ("top-level declaration of %qs specifies %<auto%>", name
);
10716 && storage_class
!= sc_extern
10717 && storage_class
!= sc_static
)
10719 if (declspecs
->gnu_thread_keyword_p
)
10720 pedwarn (input_location
, 0, "function-scope %qs implicitly auto and "
10721 "declared %<__thread%>", name
);
10723 /* When thread_local is applied to a variable of block scope the
10724 storage-class-specifier static is implied if it does not appear
10726 storage_class
= declspecs
->storage_class
= sc_static
;
10730 if (storage_class
&& friendp
)
10732 error ("storage class specifiers invalid in friend function declarations");
10733 storage_class
= sc_none
;
10737 if (!id_declarator
)
10738 unqualified_id
= NULL_TREE
;
10741 unqualified_id
= id_declarator
->u
.id
.unqualified_name
;
10742 switch (TREE_CODE (unqualified_id
))
10745 unqualified_id
= TREE_OPERAND (unqualified_id
, 0);
10746 if (TYPE_P (unqualified_id
))
10747 unqualified_id
= constructor_name (unqualified_id
);
10750 case IDENTIFIER_NODE
:
10751 case TEMPLATE_ID_EXPR
:
10755 gcc_unreachable ();
10759 if (declspecs
->std_attributes
)
10761 /* Apply the c++11 attributes to the type preceding them. */
10762 input_location
= declspecs
->locations
[ds_std_attribute
];
10763 decl_attributes (&type
, declspecs
->std_attributes
, 0);
10764 input_location
= saved_loc
;
10767 /* Determine the type of the entity declared by recurring on the
10769 for (; declarator
; declarator
= declarator
->declarator
)
10771 const cp_declarator
*inner_declarator
;
10774 if (type
== error_mark_node
)
10775 return error_mark_node
;
10777 attrs
= declarator
->attributes
;
10783 if (declarator
== NULL
|| declarator
->kind
== cdk_id
)
10784 attr_flags
|= (int) ATTR_FLAG_DECL_NEXT
;
10785 if (declarator
->kind
== cdk_function
)
10786 attr_flags
|= (int) ATTR_FLAG_FUNCTION_NEXT
;
10787 if (declarator
->kind
== cdk_array
)
10788 attr_flags
|= (int) ATTR_FLAG_ARRAY_NEXT
;
10789 returned_attrs
= decl_attributes (&type
,
10790 chainon (returned_attrs
, attrs
),
10794 /* We don't want to warn in parmeter context because we don't
10795 yet know if the parse will succeed, and this might turn out
10796 to be a constructor call. */
10797 if (decl_context
!= PARM
10798 && declarator
->parenthesized
!= UNKNOWN_LOCATION
)
10799 warning_at (declarator
->parenthesized
, OPT_Wparentheses
,
10800 "unnecessary parentheses in declaration of %qs", name
);
10801 if (declarator
->kind
== cdk_id
|| declarator
->kind
== cdk_decomp
)
10804 inner_declarator
= declarator
->declarator
;
10806 switch (declarator
->kind
)
10809 type
= create_array_type_for_decl (dname
, type
,
10810 declarator
->u
.array
.bounds
);
10811 if (!valid_array_size_p (input_location
, type
, dname
))
10812 type
= error_mark_node
;
10814 if (declarator
->std_attributes
)
10817 The optional attribute-specifier-seq appertains to the
10819 returned_attrs
= chainon (returned_attrs
,
10820 declarator
->std_attributes
);
10828 /* Declaring a function type. */
10830 input_location
= declspecs
->locations
[ds_type_spec
];
10831 abstract_virtuals_error (ACU_RETURN
, type
);
10832 input_location
= saved_loc
;
10834 /* Pick up type qualifiers which should be applied to `this'. */
10835 memfn_quals
= declarator
->u
.function
.qualifiers
;
10836 /* Pick up virt-specifiers. */
10837 virt_specifiers
= declarator
->u
.function
.virt_specifiers
;
10838 /* And ref-qualifier, too */
10839 rqual
= declarator
->u
.function
.ref_qualifier
;
10840 /* And tx-qualifier. */
10841 tree tx_qual
= declarator
->u
.function
.tx_qualifier
;
10842 /* Pick up the exception specifications. */
10843 raises
= declarator
->u
.function
.exception_specification
;
10844 /* If the exception-specification is ill-formed, let's pretend
10845 there wasn't one. */
10846 if (raises
== error_mark_node
)
10847 raises
= NULL_TREE
;
10850 error_at (location_of (reqs
), "requires-clause on return type");
10851 reqs
= declarator
->u
.function
.requires_clause
;
10853 /* Say it's a definition only for the CALL_EXPR
10854 closest to the identifier. */
10855 funcdecl_p
= inner_declarator
&& inner_declarator
->kind
== cdk_id
;
10857 /* Handle a late-specified return type. */
10858 tree late_return_type
= declarator
->u
.function
.late_return_type
;
10861 if (tree auto_node
= type_uses_auto (type
))
10863 if (!late_return_type
)
10865 if (current_class_type
10866 && LAMBDA_TYPE_P (current_class_type
))
10867 /* OK for C++11 lambdas. */;
10868 else if (cxx_dialect
< cxx14
)
10870 error ("%qs function uses "
10871 "%<auto%> type specifier without trailing "
10872 "return type", name
);
10873 inform (input_location
, "deduced return type "
10874 "only available with -std=c++14 or "
10879 error ("virtual function cannot "
10880 "have deduced return type");
10884 else if (!is_auto (type
) && sfk
!= sfk_conversion
)
10886 error ("%qs function with trailing return type has"
10887 " %qT as its type rather than plain %<auto%>",
10889 return error_mark_node
;
10891 if (tree tmpl
= CLASS_PLACEHOLDER_TEMPLATE (auto_node
))
10893 if (!late_return_type
)
10895 if (dguide_name_p (unqualified_id
))
10896 error_at (declarator
->id_loc
, "deduction guide "
10897 "for %qT must have trailing return "
10898 "type", TREE_TYPE (tmpl
));
10900 error_at (declarator
->id_loc
, "deduced class "
10901 "type %qT in function return type",
10903 inform (DECL_SOURCE_LOCATION (tmpl
),
10904 "%qD declared here", tmpl
);
10906 else if (CLASS_TYPE_P (late_return_type
)
10907 && CLASSTYPE_TEMPLATE_INFO (late_return_type
)
10908 && (CLASSTYPE_TI_TEMPLATE (late_return_type
)
10912 error ("trailing return type %qT of deduction guide "
10913 "is not a specialization of %qT",
10914 late_return_type
, TREE_TYPE (tmpl
));
10917 else if (late_return_type
10918 && sfk
!= sfk_conversion
)
10920 if (cxx_dialect
< cxx11
)
10921 /* Not using maybe_warn_cpp0x because this should
10922 always be an error. */
10923 error ("trailing return type only available with "
10924 "-std=c++11 or -std=gnu++11");
10926 error ("%qs function with trailing return type not "
10927 "declared with %<auto%> type specifier", name
);
10928 return error_mark_node
;
10931 type
= splice_late_return_type (type
, late_return_type
);
10932 if (type
== error_mark_node
)
10933 return error_mark_node
;
10935 if (late_return_type
)
10937 late_return_type_p
= true;
10938 type_quals
= cp_type_quals (type
);
10941 if (type_quals
!= TYPE_UNQUALIFIED
)
10943 if (SCALAR_TYPE_P (type
) || VOID_TYPE_P (type
))
10944 warning_at (typespec_loc
, OPT_Wignored_qualifiers
, "type "
10945 "qualifiers ignored on function return type");
10946 /* We now know that the TYPE_QUALS don't apply to the
10947 decl, but to its return type. */
10948 type_quals
= TYPE_UNQUALIFIED
;
10951 /* Error about some types functions can't return. */
10953 if (TREE_CODE (type
) == FUNCTION_TYPE
)
10955 error_at (typespec_loc
, "%qs declared as function returning "
10956 "a function", name
);
10957 return error_mark_node
;
10959 if (TREE_CODE (type
) == ARRAY_TYPE
)
10961 error_at (typespec_loc
, "%qs declared as function returning "
10963 return error_mark_node
;
10966 if (ctype
== NULL_TREE
10967 && decl_context
== FIELD
10970 ctype
= current_class_type
;
10972 if (ctype
&& (sfk
== sfk_constructor
10973 || sfk
== sfk_destructor
))
10975 /* We are within a class's scope. If our declarator name
10976 is the same as the class name, and we are defining
10977 a function, then it is a constructor/destructor, and
10978 therefore returns a void type. */
10980 /* ISO C++ 12.4/2. A destructor may not be declared
10981 const or volatile. A destructor may not be static.
10982 A destructor may not be declared with ref-qualifier.
10984 ISO C++ 12.1. A constructor may not be declared
10985 const or volatile. A constructor may not be
10986 virtual. A constructor may not be static.
10987 A constructor may not be declared with ref-qualifier. */
10989 error ((flags
== DTOR_FLAG
)
10990 ? G_("destructor cannot be static member function")
10991 : G_("constructor cannot be static member function"));
10994 error ((flags
== DTOR_FLAG
)
10995 ? G_("destructors may not be cv-qualified")
10996 : G_("constructors may not be cv-qualified"));
10997 memfn_quals
= TYPE_UNQUALIFIED
;
11002 maybe_warn_cpp0x (CPP0X_REF_QUALIFIER
);
11003 error ((flags
== DTOR_FLAG
)
11004 ? G_("destructors may not be ref-qualified")
11005 : G_("constructors may not be ref-qualified"));
11006 rqual
= REF_QUAL_NONE
;
11009 if (decl_context
== FIELD
11010 && !member_function_or_else (ctype
,
11011 current_class_type
,
11013 return error_mark_node
;
11015 if (flags
!= DTOR_FLAG
)
11017 /* It's a constructor. */
11018 if (explicitp
== 1)
11022 permerror (input_location
,
11023 "constructors cannot be declared %<virtual%>");
11026 if (decl_context
== FIELD
11027 && sfk
!= sfk_constructor
)
11028 return error_mark_node
;
11030 if (decl_context
== FIELD
)
11037 /* Cannot be both friend and virtual. */
11038 error ("virtual functions cannot be friends");
11041 if (decl_context
== NORMAL
)
11042 error ("friend declaration not in class definition");
11043 if (current_function_decl
&& funcdef_flag
)
11044 error ("can%'t define friend function %qs in a local "
11045 "class definition",
11048 else if (ctype
&& sfk
== sfk_conversion
)
11050 if (explicitp
== 1)
11052 maybe_warn_cpp0x (CPP0X_EXPLICIT_CONVERSION
);
11055 if (late_return_type_p
)
11056 error ("a conversion function cannot have a trailing return type");
11058 else if (sfk
== sfk_deduction_guide
)
11060 if (explicitp
== 1)
11064 arg_types
= grokparms (declarator
->u
.function
.parameters
,
11067 if (inner_declarator
11068 && inner_declarator
->kind
== cdk_id
11069 && inner_declarator
->u
.id
.sfk
== sfk_destructor
11070 && arg_types
!= void_list_node
)
11072 error ("destructors may not have parameters");
11073 arg_types
= void_list_node
;
11077 type
= build_function_type (type
, arg_types
);
11079 tree attrs
= declarator
->std_attributes
;
11082 tree att
= build_tree_list (tx_qual
, NULL_TREE
);
11083 /* transaction_safe applies to the type, but
11084 transaction_safe_dynamic applies to the function. */
11085 if (is_attribute_p ("transaction_safe", tx_qual
))
11086 attrs
= chainon (attrs
, att
);
11088 returned_attrs
= chainon (returned_attrs
, att
);
11093 The optional attribute-specifier-seq appertains to
11094 the function type. */
11095 decl_attributes (&type
, attrs
, 0);
11098 type
= build_exception_variant (type
, raises
);
11103 case cdk_reference
:
11105 /* Filter out pointers-to-references and references-to-references.
11106 We can get these if a TYPE_DECL is used. */
11108 if (TREE_CODE (type
) == REFERENCE_TYPE
)
11110 if (declarator
->kind
!= cdk_reference
)
11112 error ("cannot declare pointer to %q#T", type
);
11113 type
= TREE_TYPE (type
);
11116 /* In C++0x, we allow reference to reference declarations
11117 that occur indirectly through typedefs [7.1.3/8 dcl.typedef]
11118 and template type arguments [14.3.1/4 temp.arg.type]. The
11119 check for direct reference to reference declarations, which
11120 are still forbidden, occurs below. Reasoning behind the change
11121 can be found in DR106, DR540, and the rvalue reference
11123 else if (cxx_dialect
== cxx98
)
11125 error ("cannot declare reference to %q#T", type
);
11126 type
= TREE_TYPE (type
);
11129 else if (VOID_TYPE_P (type
))
11131 if (declarator
->kind
== cdk_reference
)
11132 error ("cannot declare reference to %q#T", type
);
11133 else if (declarator
->kind
== cdk_ptrmem
)
11134 error ("cannot declare pointer to %q#T member", type
);
11137 /* We now know that the TYPE_QUALS don't apply to the decl,
11138 but to the target of the pointer. */
11139 type_quals
= TYPE_UNQUALIFIED
;
11141 /* This code used to handle METHOD_TYPE, but I don't think it's
11142 possible to get it here anymore. */
11143 gcc_assert (TREE_CODE (type
) != METHOD_TYPE
);
11144 if (declarator
->kind
== cdk_ptrmem
11145 && TREE_CODE (type
) == FUNCTION_TYPE
)
11147 memfn_quals
|= type_memfn_quals (type
);
11148 type
= build_memfn_type (type
,
11149 declarator
->u
.pointer
.class_type
,
11152 if (type
== error_mark_node
)
11153 return error_mark_node
;
11155 rqual
= REF_QUAL_NONE
;
11156 memfn_quals
= TYPE_UNQUALIFIED
;
11159 if (TREE_CODE (type
) == FUNCTION_TYPE
11160 && (type_memfn_quals (type
) != TYPE_UNQUALIFIED
11161 || type_memfn_rqual (type
) != REF_QUAL_NONE
))
11162 error (declarator
->kind
== cdk_reference
11163 ? G_("cannot declare reference to qualified function type %qT")
11164 : G_("cannot declare pointer to qualified function type %qT"),
11167 /* When the pointed-to type involves components of variable size,
11168 care must be taken to ensure that the size evaluation code is
11169 emitted early enough to dominate all the possible later uses
11170 and late enough for the variables on which it depends to have
11173 This is expected to happen automatically when the pointed-to
11174 type has a name/declaration of it's own, but special attention
11175 is required if the type is anonymous.
11177 We handle the NORMAL and FIELD contexts here by inserting a
11178 dummy statement that just evaluates the size at a safe point
11179 and ensures it is not deferred until e.g. within a deeper
11180 conditional context (c++/43555).
11182 We expect nothing to be needed here for PARM or TYPENAME.
11183 Evaluating the size at this point for TYPENAME would
11184 actually be incorrect, as we might be in the middle of an
11185 expression with side effects on the pointed-to type size
11186 "arguments" prior to the pointer declaration point and the
11187 size evaluation could end up prior to the side effects. */
11189 if (!TYPE_NAME (type
)
11190 && (decl_context
== NORMAL
|| decl_context
== FIELD
)
11191 && at_function_scope_p ()
11192 && variably_modified_type_p (type
, NULL_TREE
))
11194 TYPE_NAME (type
) = build_decl (UNKNOWN_LOCATION
, TYPE_DECL
,
11196 add_decl_expr (TYPE_NAME (type
));
11199 if (declarator
->kind
== cdk_reference
)
11201 /* In C++0x, the type we are creating a reference to might be
11202 a typedef which is itself a reference type. In that case,
11203 we follow the reference collapsing rules in
11204 [7.1.3/8 dcl.typedef] to create the final reference type:
11206 "If a typedef TD names a type that is a reference to a type
11207 T, an attempt to create the type 'lvalue reference to cv TD'
11208 creates the type 'lvalue reference to T,' while an attempt
11209 to create the type "rvalue reference to cv TD' creates the
11212 if (VOID_TYPE_P (type
))
11213 /* We already gave an error. */;
11214 else if (TREE_CODE (type
) == REFERENCE_TYPE
)
11216 if (declarator
->u
.reference
.rvalue_ref
)
11217 /* Leave type alone. */;
11219 type
= cp_build_reference_type (TREE_TYPE (type
), false);
11222 type
= cp_build_reference_type
11223 (type
, declarator
->u
.reference
.rvalue_ref
);
11225 /* In C++0x, we need this check for direct reference to
11226 reference declarations, which are forbidden by
11227 [8.3.2/5 dcl.ref]. Reference to reference declarations
11228 are only allowed indirectly through typedefs and template
11229 type arguments. Example:
11231 void foo(int & &); // invalid ref-to-ref decl
11233 typedef int & int_ref;
11234 void foo(int_ref &); // valid ref-to-ref decl
11236 if (inner_declarator
&& inner_declarator
->kind
== cdk_reference
)
11237 error ("cannot declare reference to %q#T, which is not "
11238 "a typedef or a template type argument", type
);
11240 else if (TREE_CODE (type
) == METHOD_TYPE
)
11241 type
= build_ptrmemfunc_type (build_pointer_type (type
));
11242 else if (declarator
->kind
== cdk_ptrmem
)
11244 gcc_assert (TREE_CODE (declarator
->u
.pointer
.class_type
)
11245 != NAMESPACE_DECL
);
11246 if (declarator
->u
.pointer
.class_type
== error_mark_node
)
11247 /* We will already have complained. */
11248 type
= error_mark_node
;
11250 type
= build_ptrmem_type (declarator
->u
.pointer
.class_type
,
11254 type
= build_pointer_type (type
);
11256 /* Process a list of type modifier keywords (such as
11257 const or volatile) that were given inside the `*' or `&'. */
11259 if (declarator
->u
.pointer
.qualifiers
)
11262 = cp_build_qualified_type (type
,
11263 declarator
->u
.pointer
.qualifiers
);
11264 type_quals
= cp_type_quals (type
);
11267 /* Apply C++11 attributes to the pointer, and not to the
11268 type pointed to. This is unlike what is done for GNU
11269 attributes above. It is to comply with [dcl.ptr]/1:
11271 [the optional attribute-specifier-seq (7.6.1) appertains
11272 to the pointer and not to the object pointed to]. */
11273 if (declarator
->std_attributes
)
11274 decl_attributes (&type
, declarator
->std_attributes
,
11284 gcc_unreachable ();
11288 /* A `constexpr' specifier used in an object declaration declares
11289 the object as `const'. */
11290 if (constexpr_p
&& innermost_code
!= cdk_function
)
11292 /* DR1688 says that a `constexpr' specifier in combination with
11293 `volatile' is valid. */
11295 if (TREE_CODE (type
) != REFERENCE_TYPE
)
11297 type_quals
|= TYPE_QUAL_CONST
;
11298 type
= cp_build_qualified_type (type
, type_quals
);
11302 if (unqualified_id
&& TREE_CODE (unqualified_id
) == TEMPLATE_ID_EXPR
11303 && TREE_CODE (type
) != FUNCTION_TYPE
11304 && TREE_CODE (type
) != METHOD_TYPE
11305 && !variable_template_p (TREE_OPERAND (unqualified_id
, 0)))
11307 error ("template-id %qD used as a declarator",
11309 unqualified_id
= dname
;
11312 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
11313 qualified with a class-name, turn it into a METHOD_TYPE, unless
11314 we know that the function is static. We take advantage of this
11315 opportunity to do other processing that pertains to entities
11316 explicitly declared to be class members. Note that if DECLARATOR
11317 is non-NULL, we know it is a cdk_id declarator; otherwise, we
11318 would not have exited the loop above. */
11320 && declarator
->kind
== cdk_id
11321 && declarator
->u
.id
.qualifying_scope
11322 && MAYBE_CLASS_TYPE_P (declarator
->u
.id
.qualifying_scope
))
11324 ctype
= declarator
->u
.id
.qualifying_scope
;
11325 ctype
= TYPE_MAIN_VARIANT (ctype
);
11326 template_count
= num_template_headers_for_class (ctype
);
11328 if (ctype
== current_class_type
)
11332 permerror (input_location
, "member functions are implicitly "
11333 "friends of their class");
11337 permerror (declarator
->id_loc
,
11338 "extra qualification %<%T::%> on member %qs",
11341 else if (/* If the qualifying type is already complete, then we
11342 can skip the following checks. */
11343 !COMPLETE_TYPE_P (ctype
)
11344 && (/* If the function is being defined, then
11345 qualifying type must certainly be complete. */
11347 /* A friend declaration of "T::f" is OK, even if
11348 "T" is a template parameter. But, if this
11349 function is not a friend, the qualifying type
11350 must be a class. */
11351 || (!friendp
&& !CLASS_TYPE_P (ctype
))
11352 /* For a declaration, the type need not be
11353 complete, if either it is dependent (since there
11354 is no meaningful definition of complete in that
11355 case) or the qualifying class is currently being
11357 || !(dependent_type_p (ctype
)
11358 || currently_open_class (ctype
)))
11359 /* Check that the qualifying type is complete. */
11360 && !complete_type_or_else (ctype
, NULL_TREE
))
11361 return error_mark_node
;
11362 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
11364 if (current_class_type
11365 && (!friendp
|| funcdef_flag
|| initialized
))
11367 error (funcdef_flag
|| initialized
11368 ? G_("cannot define member function %<%T::%s%> "
11370 : G_("cannot declare member function %<%T::%s%> "
11372 ctype
, name
, current_class_type
);
11373 return error_mark_node
;
11376 else if (typedef_p
&& current_class_type
)
11378 error ("cannot declare member %<%T::%s%> within %qT",
11379 ctype
, name
, current_class_type
);
11380 return error_mark_node
;
11384 if (ctype
== NULL_TREE
&& decl_context
== FIELD
&& friendp
== 0)
11385 ctype
= current_class_type
;
11387 /* Now TYPE has the actual type. */
11389 if (returned_attrs
)
11392 *attrlist
= chainon (returned_attrs
, *attrlist
);
11394 attrlist
= &returned_attrs
;
11398 && declarator
->kind
== cdk_id
11399 && declarator
->std_attributes
11400 && attrlist
!= NULL
)
11401 /* [dcl.meaning]/1: The optional attribute-specifier-seq following
11402 a declarator-id appertains to the entity that is declared. */
11403 *attrlist
= chainon (*attrlist
, declarator
->std_attributes
);
11405 /* Handle parameter packs. */
11406 if (parameter_pack_p
)
11408 if (decl_context
== PARM
)
11409 /* Turn the type into a pack expansion.*/
11410 type
= make_pack_expansion (type
);
11412 error ("non-parameter %qs cannot be a parameter pack", name
);
11415 if ((decl_context
== FIELD
|| decl_context
== PARM
)
11416 && !processing_template_decl
11417 && variably_modified_type_p (type
, NULL_TREE
))
11419 if (decl_context
== FIELD
)
11420 error ("data member may not have variably modified type %qT", type
);
11422 error ("parameter may not have variably modified type %qT", type
);
11423 type
= error_mark_node
;
11426 if (explicitp
== 1 || (explicitp
&& friendp
))
11428 /* [dcl.fct.spec] (C++11) The explicit specifier shall be used only
11429 in the declaration of a constructor or conversion function within
11430 a class definition. */
11431 if (!current_class_type
)
11432 error_at (declspecs
->locations
[ds_explicit
],
11433 "%<explicit%> outside class declaration");
11435 error_at (declspecs
->locations
[ds_explicit
],
11436 "%<explicit%> in friend declaration");
11438 error_at (declspecs
->locations
[ds_explicit
],
11439 "only declarations of constructors and conversion operators "
11440 "can be %<explicit%>");
11444 if (storage_class
== sc_mutable
)
11446 if (decl_context
!= FIELD
|| friendp
)
11448 error ("non-member %qs cannot be declared %<mutable%>", name
);
11449 storage_class
= sc_none
;
11451 else if (decl_context
== TYPENAME
|| typedef_p
)
11453 error ("non-object member %qs cannot be declared %<mutable%>", name
);
11454 storage_class
= sc_none
;
11456 else if (TREE_CODE (type
) == FUNCTION_TYPE
11457 || TREE_CODE (type
) == METHOD_TYPE
)
11459 error ("function %qs cannot be declared %<mutable%>", name
);
11460 storage_class
= sc_none
;
11464 error ("static %qs cannot be declared %<mutable%>", name
);
11465 storage_class
= sc_none
;
11467 else if (type_quals
& TYPE_QUAL_CONST
)
11469 error ("const %qs cannot be declared %<mutable%>", name
);
11470 storage_class
= sc_none
;
11472 else if (TREE_CODE (type
) == REFERENCE_TYPE
)
11474 permerror (input_location
, "reference %qs cannot be declared "
11475 "%<mutable%>", name
);
11476 storage_class
= sc_none
;
11480 /* If this is declaring a typedef name, return a TYPE_DECL. */
11481 if (typedef_p
&& decl_context
!= TYPENAME
)
11485 /* This declaration:
11487 typedef void f(int) const;
11489 declares a function type which is not a member of any
11490 particular class, but which is cv-qualified; for
11491 example "f S::*" declares a pointer to a const-qualified
11492 member function of S. We record the cv-qualification in the
11494 if ((rqual
|| memfn_quals
) && TREE_CODE (type
) == FUNCTION_TYPE
)
11496 type
= apply_memfn_quals (type
, memfn_quals
, rqual
);
11498 /* We have now dealt with these qualifiers. */
11499 memfn_quals
= TYPE_UNQUALIFIED
;
11500 rqual
= REF_QUAL_NONE
;
11503 if (type_uses_auto (type
))
11505 error ("typedef declared %<auto%>");
11506 type
= error_mark_node
;
11510 error_at (location_of (reqs
), "requires-clause on typedef");
11512 if (decl_context
== FIELD
)
11513 decl
= build_lang_decl (TYPE_DECL
, unqualified_id
, type
);
11515 decl
= build_decl (input_location
, TYPE_DECL
, unqualified_id
, type
);
11516 if (id_declarator
&& declarator
->u
.id
.qualifying_scope
) {
11517 error_at (DECL_SOURCE_LOCATION (decl
),
11518 "typedef name may not be a nested-name-specifier");
11519 TREE_TYPE (decl
) = error_mark_node
;
11522 if (decl_context
!= FIELD
)
11524 if (!current_function_decl
)
11525 DECL_CONTEXT (decl
) = FROB_CONTEXT (current_namespace
);
11526 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (current_function_decl
)
11527 || (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P
11528 (current_function_decl
)))
11529 /* The TYPE_DECL is "abstract" because there will be
11530 clones of this constructor/destructor, and there will
11531 be copies of this TYPE_DECL generated in those
11532 clones. The decloning optimization (for space) may
11533 revert this subsequently if it determines that
11534 the clones should share a common implementation. */
11535 DECL_ABSTRACT_P (decl
) = true;
11537 else if (current_class_type
11538 && constructor_name_p (unqualified_id
, current_class_type
))
11539 permerror (input_location
, "ISO C++ forbids nested type %qD with same name "
11540 "as enclosing class",
11543 /* If the user declares "typedef struct {...} foo" then the
11544 struct will have an anonymous name. Fill that name in now.
11545 Nothing can refer to it, so nothing needs know about the name
11547 if (type
!= error_mark_node
11549 && TYPE_NAME (type
)
11550 && TREE_CODE (TYPE_NAME (type
)) == TYPE_DECL
11551 && TYPE_UNNAMED_P (type
)
11552 && declspecs
->type_definition_p
11553 && attributes_naming_typedef_ok (*attrlist
)
11554 && cp_type_quals (type
) == TYPE_UNQUALIFIED
)
11555 name_unnamed_type (type
, decl
);
11558 || (typedef_decl
&& C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl
)))
11559 C_TYPEDEF_EXPLICITLY_SIGNED (decl
) = 1;
11561 bad_specifiers (decl
, BSP_TYPE
, virtualp
,
11562 memfn_quals
!= TYPE_UNQUALIFIED
,
11563 inlinep
, friendp
, raises
!= NULL_TREE
);
11565 if (decl_spec_seq_has_spec_p (declspecs
, ds_alias
))
11566 /* Acknowledge that this was written:
11567 `using analias = atype;'. */
11568 TYPE_DECL_ALIAS_P (decl
) = 1;
11573 /* Detect the case of an array type of unspecified size
11574 which came, as such, direct from a typedef name.
11575 We must copy the type, so that the array's domain can be
11576 individually set by the object's initializer. */
11578 if (type
&& typedef_type
11579 && TREE_CODE (type
) == ARRAY_TYPE
&& !TYPE_DOMAIN (type
)
11580 && TYPE_MAIN_VARIANT (type
) == TYPE_MAIN_VARIANT (typedef_type
))
11581 type
= build_cplus_array_type (TREE_TYPE (type
), NULL_TREE
);
11583 /* Detect where we're using a typedef of function type to declare a
11584 function. PARMS will not be set, so we must create it now. */
11586 if (type
== typedef_type
&& TREE_CODE (type
) == FUNCTION_TYPE
)
11588 tree decls
= NULL_TREE
;
11591 for (args
= TYPE_ARG_TYPES (type
);
11592 args
&& args
!= void_list_node
;
11593 args
= TREE_CHAIN (args
))
11595 tree decl
= cp_build_parm_decl (NULL_TREE
, NULL_TREE
,
11596 TREE_VALUE (args
));
11598 DECL_CHAIN (decl
) = decls
;
11602 parms
= nreverse (decls
);
11604 if (decl_context
!= TYPENAME
)
11606 /* The qualifiers on the function type become the qualifiers on
11607 the non-static member function. */
11608 memfn_quals
|= type_memfn_quals (type
);
11609 rqual
= type_memfn_rqual (type
);
11610 type_quals
= TYPE_UNQUALIFIED
;
11614 /* If this is a type name (such as, in a cast or sizeof),
11615 compute the type and return it now. */
11617 if (decl_context
== TYPENAME
)
11619 /* Note that here we don't care about type_quals. */
11621 /* Special case: "friend class foo" looks like a TYPENAME context. */
11626 error ("%<inline%> specified for friend class declaration");
11632 /* Don't allow friend declaration without a class-key. */
11633 if (TREE_CODE (type
) == TEMPLATE_TYPE_PARM
)
11634 permerror (input_location
, "template parameters cannot be friends");
11635 else if (TREE_CODE (type
) == TYPENAME_TYPE
)
11636 permerror (input_location
, "friend declaration requires class-key, "
11637 "i.e. %<friend class %T::%D%>",
11638 TYPE_CONTEXT (type
), TYPENAME_TYPE_FULLNAME (type
));
11640 permerror (input_location
, "friend declaration requires class-key, "
11641 "i.e. %<friend %#T%>",
11645 /* Only try to do this stuff if we didn't already give up. */
11646 if (type
!= integer_type_node
)
11648 /* A friendly class? */
11649 if (current_class_type
)
11650 make_friend_class (current_class_type
, TYPE_MAIN_VARIANT (type
),
11651 /*complain=*/true);
11653 error ("trying to make class %qT a friend of global scope",
11656 type
= void_type_node
;
11659 else if (memfn_quals
|| rqual
)
11661 if (ctype
== NULL_TREE
11662 && TREE_CODE (type
) == METHOD_TYPE
)
11663 ctype
= TYPE_METHOD_BASETYPE (type
);
11666 type
= build_memfn_type (type
, ctype
, memfn_quals
, rqual
);
11667 /* Core issue #547: need to allow this in template type args.
11668 Allow it in general in C++11 for alias-declarations. */
11669 else if ((template_type_arg
|| cxx_dialect
>= cxx11
)
11670 && TREE_CODE (type
) == FUNCTION_TYPE
)
11671 type
= apply_memfn_quals (type
, memfn_quals
, rqual
);
11673 error ("invalid qualifiers on non-member function type");
11677 error_at (location_of (reqs
), "requires-clause on type-id");
11681 else if (unqualified_id
== NULL_TREE
&& decl_context
!= PARM
11682 && decl_context
!= CATCHPARM
11683 && TREE_CODE (type
) != UNION_TYPE
11685 && innermost_code
!= cdk_decomp
)
11687 error ("abstract declarator %qT used as declaration", type
);
11688 return error_mark_node
;
11691 if (!FUNC_OR_METHOD_TYPE_P (type
))
11693 /* Only functions may be declared using an operator-function-id. */
11694 if (dname
&& IDENTIFIER_ANY_OP_P (dname
))
11696 error ("declaration of %qD as non-function", dname
);
11697 return error_mark_node
;
11701 error_at (location_of (reqs
),
11702 "requires-clause on declaration of non-function type %qT",
11706 /* We don't check parameter types here because we can emit a better
11707 error message later. */
11708 if (decl_context
!= PARM
)
11710 type
= check_var_type (unqualified_id
, type
);
11711 if (type
== error_mark_node
)
11712 return error_mark_node
;
11715 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
11716 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
11718 if (decl_context
== PARM
|| decl_context
== CATCHPARM
)
11720 if (ctype
|| in_namespace
)
11721 error ("cannot use %<::%> in parameter declaration");
11723 if (type_uses_auto (type
)
11724 && !(cxx_dialect
>= cxx17
&& template_parm_flag
))
11726 if (cxx_dialect
>= cxx14
)
11727 error ("%<auto%> parameter not permitted in this context");
11729 error ("parameter declared %<auto%>");
11730 type
= error_mark_node
;
11733 /* A parameter declared as an array of T is really a pointer to T.
11734 One declared as a function is really a pointer to a function.
11735 One declared as a member is really a pointer to member. */
11737 if (TREE_CODE (type
) == ARRAY_TYPE
)
11739 /* Transfer const-ness of array into that of type pointed to. */
11740 type
= build_pointer_type (TREE_TYPE (type
));
11741 type_quals
= TYPE_UNQUALIFIED
;
11742 array_parameter_p
= true;
11744 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
11745 type
= build_pointer_type (type
);
11748 if (ctype
&& TREE_CODE (type
) == FUNCTION_TYPE
&& staticp
< 2
11749 && !(identifier_p (unqualified_id
)
11750 && IDENTIFIER_NEWDEL_OP_P (unqualified_id
)))
11752 cp_cv_quals real_quals
= memfn_quals
;
11753 if (cxx_dialect
< cxx14
&& constexpr_p
11754 && sfk
!= sfk_constructor
&& sfk
!= sfk_destructor
)
11755 real_quals
|= TYPE_QUAL_CONST
;
11756 type
= build_memfn_type (type
, ctype
, real_quals
, rqual
);
11760 tree decl
= NULL_TREE
;
11762 if (decl_context
== PARM
)
11764 decl
= cp_build_parm_decl (NULL_TREE
, unqualified_id
, type
);
11765 DECL_ARRAY_PARAMETER_P (decl
) = array_parameter_p
;
11767 bad_specifiers (decl
, BSP_PARM
, virtualp
,
11768 memfn_quals
!= TYPE_UNQUALIFIED
,
11769 inlinep
, friendp
, raises
!= NULL_TREE
);
11771 else if (decl_context
== FIELD
)
11773 if (!staticp
&& !friendp
&& TREE_CODE (type
) != METHOD_TYPE
)
11774 if (tree auto_node
= type_uses_auto (type
))
11776 location_t loc
= declspecs
->locations
[ds_type_spec
];
11777 if (CLASS_PLACEHOLDER_TEMPLATE (auto_node
))
11778 error_at (loc
, "invalid use of template-name %qE without an "
11780 CLASS_PLACEHOLDER_TEMPLATE (auto_node
));
11782 error_at (loc
, "non-static data member declared with "
11783 "placeholder %qT", auto_node
);
11784 type
= error_mark_node
;
11787 /* The C99 flexible array extension. */
11788 if (!staticp
&& TREE_CODE (type
) == ARRAY_TYPE
11789 && TYPE_DOMAIN (type
) == NULL_TREE
)
11792 && (TREE_CODE (ctype
) == UNION_TYPE
11793 || TREE_CODE (ctype
) == QUAL_UNION_TYPE
))
11795 error ("flexible array member in union");
11796 type
= error_mark_node
;
11800 /* Array is a flexible member. */
11801 if (in_system_header_at (input_location
))
11802 /* Do not warn on flexible array members in system
11803 headers because glibc uses them. */;
11805 pedwarn (input_location
, OPT_Wpedantic
,
11806 "ISO C++ forbids flexible array member %qs", name
);
11808 pedwarn (input_location
, OPT_Wpedantic
,
11809 "ISO C++ forbids flexible array members");
11811 /* Flexible array member has a null domain. */
11812 type
= build_cplus_array_type (TREE_TYPE (type
), NULL_TREE
);
11816 if (type
== error_mark_node
)
11818 /* Happens when declaring arrays of sizes which
11819 are error_mark_node, for example. */
11822 else if (in_namespace
&& !friendp
)
11824 /* Something like struct S { int N::j; }; */
11825 error ("invalid use of %<::%>");
11826 return error_mark_node
;
11828 else if (TREE_CODE (type
) == FUNCTION_TYPE
11829 || TREE_CODE (type
) == METHOD_TYPE
)
11832 tree function_context
;
11836 /* This should never happen in pure C++ (the check
11837 could be an assert). It could happen in
11838 Objective-C++ if someone writes invalid code that
11839 uses a function declaration for an instance
11840 variable or property (instance variables and
11841 properties are parsed as FIELD_DECLs, but they are
11842 part of an Objective-C class, not a C++ class).
11843 That code is invalid and is caught by this
11847 error ("declaration of function %qD in invalid context",
11849 return error_mark_node
;
11852 /* ``A union may [ ... ] not [ have ] virtual functions.''
11854 if (virtualp
&& TREE_CODE (ctype
) == UNION_TYPE
)
11856 error ("function %qD declared %<virtual%> inside a union",
11858 return error_mark_node
;
11862 && identifier_p (unqualified_id
)
11863 && IDENTIFIER_NEWDEL_OP_P (unqualified_id
))
11865 error ("%qD cannot be declared %<virtual%>, since it "
11866 "is always static", unqualified_id
);
11871 /* Check that the name used for a destructor makes sense. */
11872 if (sfk
== sfk_destructor
)
11874 tree uqname
= id_declarator
->u
.id
.unqualified_name
;
11878 gcc_assert (friendp
);
11879 error ("expected qualified name in friend declaration "
11880 "for destructor %qD", uqname
);
11881 return error_mark_node
;
11884 if (!check_dtor_name (ctype
, TREE_OPERAND (uqname
, 0)))
11886 error ("declaration of %qD as member of %qT",
11888 return error_mark_node
;
11892 error ("a destructor cannot be %<concept%>");
11893 return error_mark_node
;
11897 error ("a destructor cannot be %<constexpr%>");
11898 return error_mark_node
;
11901 else if (sfk
== sfk_constructor
&& friendp
&& !ctype
)
11903 error ("expected qualified name in friend declaration "
11904 "for constructor %qD",
11905 id_declarator
->u
.id
.unqualified_name
);
11906 return error_mark_node
;
11908 if (sfk
== sfk_constructor
)
11911 error ("a constructor cannot be %<concept%>");
11912 return error_mark_node
;
11916 error ("a concept cannot be a member function");
11920 if (TREE_CODE (unqualified_id
) == TEMPLATE_ID_EXPR
)
11922 tree tmpl
= TREE_OPERAND (unqualified_id
, 0);
11923 if (variable_template_p (tmpl
))
11925 error ("specialization of variable template %qD "
11926 "declared as function", tmpl
);
11927 inform (DECL_SOURCE_LOCATION (tmpl
),
11928 "variable template declared here");
11929 return error_mark_node
;
11933 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
11934 function_context
= (ctype
!= NULL_TREE
) ?
11935 decl_function_context (TYPE_MAIN_DECL (ctype
)) : NULL_TREE
;
11936 publicp
= (! friendp
|| ! staticp
)
11937 && function_context
== NULL_TREE
;
11939 if (late_return_type_p
)
11940 TYPE_HAS_LATE_RETURN_TYPE (type
) = 1;
11942 decl
= grokfndecl (ctype
, type
,
11943 TREE_CODE (unqualified_id
) != TEMPLATE_ID_EXPR
11944 ? unqualified_id
: dname
,
11948 virtualp
, flags
, memfn_quals
, rqual
, raises
,
11949 friendp
? -1 : 0, friendp
, publicp
,
11950 inlinep
| (2 * constexpr_p
) | (4 * concept_p
),
11951 initialized
== SD_DELETED
, sfk
,
11952 funcdef_flag
, template_count
, in_namespace
,
11953 attrlist
, declarator
->id_loc
);
11954 decl
= set_virt_specifiers (decl
, virt_specifiers
);
11955 if (decl
== NULL_TREE
)
11956 return error_mark_node
;
11958 /* This clobbers the attrs stored in `decl' from `attrlist'. */
11959 /* The decl and setting of decl_attr is also turned off. */
11960 decl
= build_decl_attribute_variant (decl
, decl_attr
);
11963 /* [class.conv.ctor]
11965 A constructor declared without the function-specifier
11966 explicit that can be called with a single parameter
11967 specifies a conversion from the type of its first
11968 parameter to the type of its class. Such a constructor
11969 is called a converting constructor. */
11970 if (explicitp
== 2)
11971 DECL_NONCONVERTING_P (decl
) = 1;
11973 else if (!staticp
&& !dependent_type_p (type
)
11974 && !COMPLETE_TYPE_P (complete_type (type
))
11975 && (!complete_or_array_type_p (type
)
11976 || initialized
== 0))
11978 if (TREE_CODE (type
) != ARRAY_TYPE
11979 || !COMPLETE_TYPE_P (TREE_TYPE (type
)))
11981 if (unqualified_id
)
11983 error ("field %qD has incomplete type %qT",
11984 unqualified_id
, type
);
11985 cxx_incomplete_type_inform (strip_array_types (type
));
11988 error ("name %qT has incomplete type", type
);
11990 type
= error_mark_node
;
11998 error ("%qE is neither function nor member function; "
11999 "cannot be declared friend", unqualified_id
);
12007 /* Friends are treated specially. */
12008 if (ctype
== current_class_type
)
12009 ; /* We already issued a permerror. */
12010 else if (decl
&& DECL_NAME (decl
))
12012 if (template_class_depth (current_class_type
) == 0)
12014 decl
= check_explicit_specialization
12015 (unqualified_id
, decl
, template_count
,
12016 2 * funcdef_flag
+ 4);
12017 if (decl
== error_mark_node
)
12018 return error_mark_node
;
12021 decl
= do_friend (ctype
, unqualified_id
, decl
,
12027 return error_mark_node
;
12030 /* Structure field. It may not be a function, except for C++. */
12032 if (decl
== NULL_TREE
)
12036 /* C++ allows static class members. All other work
12037 for this is done by grokfield. */
12038 decl
= build_lang_decl_loc (declarator
12039 ? declarator
->id_loc
12041 VAR_DECL
, unqualified_id
, type
);
12042 set_linkage_for_static_data_member (decl
);
12044 error ("static data member %qE declared %<concept%>",
12046 else if (constexpr_p
&& !initialized
)
12048 error ("constexpr static data member %qD must have an "
12049 "initializer", decl
);
12050 constexpr_p
= false;
12054 mark_inline_variable (decl
);
12056 if (!DECL_VAR_DECLARED_INLINE_P (decl
)
12057 && !(cxx_dialect
>= cxx17
&& constexpr_p
))
12058 /* Even if there is an in-class initialization, DECL
12059 is considered undefined until an out-of-class
12060 definition is provided, unless this is an inline
12062 DECL_EXTERNAL (decl
) = 1;
12066 CP_DECL_THREAD_LOCAL_P (decl
) = true;
12067 if (!processing_template_decl
)
12068 set_decl_tls_model (decl
, decl_default_tls_model (decl
));
12069 if (declspecs
->gnu_thread_keyword_p
)
12070 SET_DECL_GNU_TLS_P (decl
);
12076 error ("non-static data member %qE declared %<concept%>",
12078 else if (constexpr_p
)
12080 error ("non-static data member %qE declared %<constexpr%>",
12082 constexpr_p
= false;
12084 decl
= build_decl (input_location
,
12085 FIELD_DECL
, unqualified_id
, type
);
12086 DECL_NONADDRESSABLE_P (decl
) = bitfield
;
12087 if (bitfield
&& !unqualified_id
)
12088 TREE_NO_WARNING (decl
) = 1;
12090 if (storage_class
== sc_mutable
)
12092 DECL_MUTABLE_P (decl
) = 1;
12093 storage_class
= sc_none
;
12098 /* An attempt is being made to initialize a non-static
12099 member. This is new in C++11. */
12100 maybe_warn_cpp0x (CPP0X_NSDMI
);
12102 /* If this has been parsed with static storage class, but
12103 errors forced staticp to be cleared, ensure NSDMI is
12105 if (declspecs
->storage_class
== sc_static
)
12106 DECL_INITIAL (decl
) = error_mark_node
;
12110 bad_specifiers (decl
, BSP_FIELD
, virtualp
,
12111 memfn_quals
!= TYPE_UNQUALIFIED
,
12112 staticp
? false : inlinep
, friendp
,
12113 raises
!= NULL_TREE
);
12116 else if (TREE_CODE (type
) == FUNCTION_TYPE
12117 || TREE_CODE (type
) == METHOD_TYPE
)
12119 tree original_name
;
12122 if (!unqualified_id
)
12123 return error_mark_node
;
12125 if (TREE_CODE (unqualified_id
) == TEMPLATE_ID_EXPR
)
12126 original_name
= dname
;
12128 original_name
= unqualified_id
;
12129 // FIXME:gcc_assert (original_name == dname);
12131 if (storage_class
== sc_auto
)
12132 error ("storage class %<auto%> invalid for function %qs", name
);
12133 else if (storage_class
== sc_register
)
12134 error ("storage class %<register%> invalid for function %qs", name
);
12137 if (declspecs
->gnu_thread_keyword_p
)
12138 error ("storage class %<__thread%> invalid for function %qs",
12141 error ("storage class %<thread_local%> invalid for function %qs",
12145 if (virt_specifiers
)
12146 error ("virt-specifiers in %qs not allowed outside a class definition", name
);
12147 /* Function declaration not at top level.
12148 Storage classes other than `extern' are not allowed
12149 and `extern' makes no difference. */
12150 if (! toplevel_bindings_p ()
12151 && (storage_class
== sc_static
12152 || decl_spec_seq_has_spec_p (declspecs
, ds_inline
))
12155 if (storage_class
== sc_static
)
12156 pedwarn (input_location
, OPT_Wpedantic
,
12157 "%<static%> specifier invalid for function %qs "
12158 "declared out of global scope", name
);
12160 pedwarn (input_location
, OPT_Wpedantic
,
12161 "%<inline%> specifier invalid for function %qs "
12162 "declared out of global scope", name
);
12165 if (ctype
== NULL_TREE
)
12169 error ("virtual non-class function %qs", name
);
12172 else if (sfk
== sfk_constructor
12173 || sfk
== sfk_destructor
)
12175 error (funcdef_flag
12176 ? G_("%qs defined in a non-class scope")
12177 : G_("%qs declared in a non-class scope"), name
);
12182 /* Record whether the function is public. */
12183 publicp
= (ctype
!= NULL_TREE
12184 || storage_class
!= sc_static
);
12186 if (late_return_type_p
)
12187 TYPE_HAS_LATE_RETURN_TYPE (type
) = 1;
12189 decl
= grokfndecl (ctype
, type
, original_name
, parms
, unqualified_id
,
12190 reqs
, virtualp
, flags
, memfn_quals
, rqual
, raises
,
12193 inlinep
| (2 * constexpr_p
) | (4 * concept_p
),
12194 initialized
== SD_DELETED
,
12197 template_count
, in_namespace
, attrlist
,
12198 declarator
->id_loc
);
12199 if (decl
== NULL_TREE
)
12200 return error_mark_node
;
12202 if (explicitp
== 2)
12203 DECL_NONCONVERTING_P (decl
) = 1;
12206 int invalid_static
= 0;
12208 /* Don't allow a static member function in a class, and forbid
12209 declaring main to be static. */
12210 if (TREE_CODE (type
) == METHOD_TYPE
)
12212 permerror (input_location
, "cannot declare member function %qD to have "
12213 "static linkage", decl
);
12214 invalid_static
= 1;
12216 else if (current_function_decl
)
12218 /* 7.1.1: There can be no static function declarations within a
12220 error ("cannot declare static function inside another function");
12221 invalid_static
= 1;
12224 if (invalid_static
)
12227 storage_class
= sc_none
;
12233 /* It's a variable. */
12235 /* An uninitialized decl with `extern' is a reference. */
12236 decl
= grokvardecl (type
, dname
, unqualified_id
,
12243 ctype
? ctype
: in_namespace
);
12244 if (decl
== NULL_TREE
)
12245 return error_mark_node
;
12247 bad_specifiers (decl
, BSP_VAR
, virtualp
,
12248 memfn_quals
!= TYPE_UNQUALIFIED
,
12249 inlinep
, friendp
, raises
!= NULL_TREE
);
12253 DECL_CONTEXT (decl
) = ctype
;
12256 permerror (input_location
, "%<static%> may not be used when defining "
12257 "(as opposed to declaring) a static data member");
12259 storage_class
= sc_none
;
12261 if (storage_class
== sc_register
&& TREE_STATIC (decl
))
12263 error ("static member %qD declared %<register%>", decl
);
12264 storage_class
= sc_none
;
12266 if (storage_class
== sc_extern
&& pedantic
)
12268 pedwarn (input_location
, OPT_Wpedantic
,
12269 "cannot explicitly declare member %q#D to have "
12270 "extern linkage", decl
);
12271 storage_class
= sc_none
;
12274 else if (constexpr_p
&& DECL_EXTERNAL (decl
))
12276 error ("declaration of constexpr variable %qD is not a definition",
12278 constexpr_p
= false;
12282 mark_inline_variable (decl
);
12283 if (innermost_code
== cdk_decomp
)
12285 gcc_assert (declarator
&& declarator
->kind
== cdk_decomp
);
12286 DECL_SOURCE_LOCATION (decl
) = declarator
->id_loc
;
12287 DECL_ARTIFICIAL (decl
) = 1;
12288 fit_decomposition_lang_decl (decl
, NULL_TREE
);
12292 if (VAR_P (decl
) && !initialized
)
12293 if (tree auto_node
= type_uses_auto (type
))
12294 if (!CLASS_PLACEHOLDER_TEMPLATE (auto_node
))
12296 location_t loc
= declspecs
->locations
[ds_type_spec
];
12297 error_at (loc
, "declaration of %q#D has no initializer", decl
);
12298 TREE_TYPE (decl
) = error_mark_node
;
12301 if (storage_class
== sc_extern
&& initialized
&& !funcdef_flag
)
12303 if (toplevel_bindings_p ())
12305 /* It's common practice (and completely valid) to have a const
12306 be initialized and declared extern. */
12307 if (!(type_quals
& TYPE_QUAL_CONST
))
12308 warning (0, "%qs initialized and declared %<extern%>", name
);
12312 error ("%qs has both %<extern%> and initializer", name
);
12313 return error_mark_node
;
12317 /* Record `register' declaration for warnings on &
12318 and in case doing stupid register allocation. */
12320 if (storage_class
== sc_register
)
12322 DECL_REGISTER (decl
) = 1;
12323 /* Warn about register storage specifiers on PARM_DECLs. */
12324 if (TREE_CODE (decl
) == PARM_DECL
)
12326 if (cxx_dialect
>= cxx17
)
12327 pedwarn (DECL_SOURCE_LOCATION (decl
), OPT_Wregister
,
12328 "ISO C++17 does not allow %<register%> storage "
12329 "class specifier");
12331 warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wregister
,
12332 "%<register%> storage class specifier used");
12335 else if (storage_class
== sc_extern
)
12336 DECL_THIS_EXTERN (decl
) = 1;
12337 else if (storage_class
== sc_static
)
12338 DECL_THIS_STATIC (decl
) = 1;
12340 /* Set constexpr flag on vars (functions got it in grokfndecl). */
12341 if (constexpr_p
&& VAR_P (decl
))
12342 DECL_DECLARED_CONSTEXPR_P (decl
) = true;
12344 /* Record constancy and volatility on the DECL itself . There's
12345 no need to do this when processing a template; we'll do this
12346 for the instantiated declaration based on the type of DECL. */
12347 if (!processing_template_decl
)
12348 cp_apply_type_quals_to_decl (type_quals
, decl
);
12354 /* Subroutine of start_function. Ensure that each of the parameter
12355 types (as listed in PARMS) is complete, as is required for a
12356 function definition. */
12359 require_complete_types_for_parms (tree parms
)
12361 for (; parms
; parms
= DECL_CHAIN (parms
))
12363 if (dependent_type_p (TREE_TYPE (parms
)))
12365 if (!VOID_TYPE_P (TREE_TYPE (parms
))
12366 && complete_type_or_else (TREE_TYPE (parms
), parms
))
12368 relayout_decl (parms
);
12369 DECL_ARG_TYPE (parms
) = type_passed_as (TREE_TYPE (parms
));
12371 maybe_warn_parm_abi (TREE_TYPE (parms
),
12372 DECL_SOURCE_LOCATION (parms
));
12375 /* grokparms or complete_type_or_else will have already issued
12377 TREE_TYPE (parms
) = error_mark_node
;
12381 /* Returns nonzero if T is a local variable. */
12384 local_variable_p (const_tree t
)
12387 /* A VAR_DECL with a context that is a _TYPE is a static data
12389 && !TYPE_P (CP_DECL_CONTEXT (t
))
12390 /* Any other non-local variable must be at namespace scope. */
12391 && !DECL_NAMESPACE_SCOPE_P (t
))
12392 || (TREE_CODE (t
) == PARM_DECL
))
12398 /* Like local_variable_p, but suitable for use as a tree-walking
12402 local_variable_p_walkfn (tree
*tp
, int *walk_subtrees
,
12405 if (local_variable_p (*tp
)
12406 && (!DECL_ARTIFICIAL (*tp
) || DECL_NAME (*tp
) == this_identifier
))
12408 else if (TYPE_P (*tp
))
12409 *walk_subtrees
= 0;
12414 /* Check that ARG, which is a default-argument expression for a
12415 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
12416 something goes wrong. DECL may also be a _TYPE node, rather than a
12417 DECL, if there is no DECL available. */
12420 check_default_argument (tree decl
, tree arg
, tsubst_flags_t complain
)
12425 if (TREE_CODE (arg
) == DEFAULT_ARG
)
12426 /* We get a DEFAULT_ARG when looking at an in-class declaration
12427 with a default argument. Ignore the argument for now; we'll
12428 deal with it after the class is complete. */
12437 decl_type
= TREE_TYPE (decl
);
12439 if (arg
== error_mark_node
12440 || decl
== error_mark_node
12441 || TREE_TYPE (arg
) == error_mark_node
12442 || decl_type
== error_mark_node
)
12443 /* Something already went wrong. There's no need to check
12445 return error_mark_node
;
12447 /* [dcl.fct.default]
12449 A default argument expression is implicitly converted to the
12451 ++cp_unevaluated_operand
;
12452 perform_implicit_conversion_flags (decl_type
, arg
, complain
,
12454 --cp_unevaluated_operand
;
12456 /* Avoid redundant -Wzero-as-null-pointer-constant warnings at
12458 if (TYPE_PTR_OR_PTRMEM_P (decl_type
)
12459 && null_ptr_cst_p (arg
))
12460 return nullptr_node
;
12462 /* [dcl.fct.default]
12464 Local variables shall not be used in default argument
12467 The keyword `this' shall not be used in a default argument of a
12468 member function. */
12469 var
= cp_walk_tree_without_duplicates (&arg
, local_variable_p_walkfn
, NULL
);
12472 if (complain
& tf_warning_or_error
)
12474 if (DECL_NAME (var
) == this_identifier
)
12475 permerror (input_location
, "default argument %qE uses %qD",
12478 error ("default argument %qE uses local variable %qD", arg
, var
);
12480 return error_mark_node
;
12487 /* Returns a deprecated type used within TYPE, or NULL_TREE if none. */
12490 type_is_deprecated (tree type
)
12492 enum tree_code code
;
12493 if (TREE_DEPRECATED (type
))
12495 if (TYPE_NAME (type
))
12497 if (TREE_DEPRECATED (TYPE_NAME (type
)))
12503 /* Do warn about using typedefs to a deprecated class. */
12504 if (OVERLOAD_TYPE_P (type
) && type
!= TYPE_MAIN_VARIANT (type
))
12505 return type_is_deprecated (TYPE_MAIN_VARIANT (type
));
12507 code
= TREE_CODE (type
);
12509 if (code
== POINTER_TYPE
|| code
== REFERENCE_TYPE
12510 || code
== OFFSET_TYPE
|| code
== FUNCTION_TYPE
12511 || code
== METHOD_TYPE
|| code
== ARRAY_TYPE
)
12512 return type_is_deprecated (TREE_TYPE (type
));
12514 if (TYPE_PTRMEMFUNC_P (type
))
12515 return type_is_deprecated
12516 (TREE_TYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (type
))));
12521 /* Decode the list of parameter types for a function type.
12522 Given the list of things declared inside the parens,
12523 return a list of types.
12525 If this parameter does not end with an ellipsis, we append
12528 *PARMS is set to the chain of PARM_DECLs created. */
12531 grokparms (tree parmlist
, tree
*parms
)
12533 tree result
= NULL_TREE
;
12534 tree decls
= NULL_TREE
;
12538 for (parm
= parmlist
; parm
!= NULL_TREE
; parm
= TREE_CHAIN (parm
))
12540 tree type
= NULL_TREE
;
12541 tree init
= TREE_PURPOSE (parm
);
12542 tree decl
= TREE_VALUE (parm
);
12544 if (parm
== void_list_node
)
12547 if (! decl
|| TREE_TYPE (decl
) == error_mark_node
)
12550 type
= TREE_TYPE (decl
);
12551 if (VOID_TYPE_P (type
))
12553 if (same_type_p (type
, void_type_node
)
12555 && !DECL_NAME (decl
) && !result
12556 && TREE_CHAIN (parm
) == void_list_node
)
12557 /* DR 577: A parameter list consisting of a single
12558 unnamed parameter of non-dependent type 'void'. */
12560 else if (cv_qualified_p (type
))
12561 error_at (DECL_SOURCE_LOCATION (decl
),
12562 "invalid use of cv-qualified type %qT in "
12563 "parameter declaration", type
);
12565 error_at (DECL_SOURCE_LOCATION (decl
),
12566 "invalid use of type %<void%> in parameter "
12568 /* It's not a good idea to actually create parameters of
12569 type `void'; other parts of the compiler assume that a
12570 void type terminates the parameter list. */
12571 type
= error_mark_node
;
12572 TREE_TYPE (decl
) = error_mark_node
;
12575 if (type
!= error_mark_node
)
12577 if (deprecated_state
!= DEPRECATED_SUPPRESS
)
12579 tree deptype
= type_is_deprecated (type
);
12581 warn_deprecated_use (deptype
, NULL_TREE
);
12584 /* Top-level qualifiers on the parameters are
12585 ignored for function types. */
12586 type
= cp_build_qualified_type (type
, 0);
12587 if (TREE_CODE (type
) == METHOD_TYPE
)
12589 error ("parameter %qD invalidly declared method type", decl
);
12590 type
= build_pointer_type (type
);
12591 TREE_TYPE (decl
) = type
;
12593 else if (abstract_virtuals_error (decl
, type
))
12594 any_error
= 1; /* Seems like a good idea. */
12595 else if (cxx_dialect
< cxx17
&& POINTER_TYPE_P (type
))
12597 /* Before C++17 DR 393:
12598 [dcl.fct]/6, parameter types cannot contain pointers
12599 (references) to arrays of unknown bound. */
12600 tree t
= TREE_TYPE (type
);
12601 int ptr
= TYPE_PTR_P (type
);
12605 if (TYPE_PTR_P (t
))
12607 else if (TREE_CODE (t
) != ARRAY_TYPE
)
12609 else if (!TYPE_DOMAIN (t
))
12613 if (TREE_CODE (t
) == ARRAY_TYPE
)
12614 pedwarn (DECL_SOURCE_LOCATION (decl
), OPT_Wpedantic
,
12616 ? G_("parameter %qD includes pointer to array of "
12617 "unknown bound %qT")
12618 : G_("parameter %qD includes reference to array of "
12619 "unknown bound %qT"),
12625 else if (init
&& !processing_template_decl
)
12626 init
= check_default_argument (decl
, init
, tf_warning_or_error
);
12629 DECL_CHAIN (decl
) = decls
;
12631 result
= tree_cons (init
, type
, result
);
12633 decls
= nreverse (decls
);
12634 result
= nreverse (result
);
12636 result
= chainon (result
, void_list_node
);
12643 /* D is a constructor or overloaded `operator='.
12645 Let T be the class in which D is declared. Then, this function
12648 -1 if D's is an ill-formed constructor or copy assignment operator
12649 whose first parameter is of type `T'.
12650 0 if D is not a copy constructor or copy assignment
12652 1 if D is a copy constructor or copy assignment operator whose
12653 first parameter is a reference to non-const qualified T.
12654 2 if D is a copy constructor or copy assignment operator whose
12655 first parameter is a reference to const qualified T.
12657 This function can be used as a predicate. Positive values indicate
12658 a copy constructor and nonzero values indicate a copy assignment
12662 copy_fn_p (const_tree d
)
12668 gcc_assert (DECL_FUNCTION_MEMBER_P (d
));
12670 if (TREE_CODE (d
) == TEMPLATE_DECL
12671 || (DECL_TEMPLATE_INFO (d
)
12672 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d
))))
12673 /* Instantiations of template member functions are never copy
12674 functions. Note that member functions of templated classes are
12675 represented as template functions internally, and we must
12676 accept those as copy functions. */
12679 args
= FUNCTION_FIRST_USER_PARMTYPE (d
);
12683 arg_type
= TREE_VALUE (args
);
12684 if (arg_type
== error_mark_node
)
12687 if (TYPE_MAIN_VARIANT (arg_type
) == DECL_CONTEXT (d
))
12689 /* Pass by value copy assignment operator. */
12692 else if (TREE_CODE (arg_type
) == REFERENCE_TYPE
12693 && !TYPE_REF_IS_RVALUE (arg_type
)
12694 && TYPE_MAIN_VARIANT (TREE_TYPE (arg_type
)) == DECL_CONTEXT (d
))
12696 if (CP_TYPE_CONST_P (TREE_TYPE (arg_type
)))
12702 args
= TREE_CHAIN (args
);
12704 if (args
&& args
!= void_list_node
&& !TREE_PURPOSE (args
))
12705 /* There are more non-optional args. */
12711 /* D is a constructor or overloaded `operator='.
12713 Let T be the class in which D is declared. Then, this function
12714 returns true when D is a move constructor or move assignment
12715 operator, false otherwise. */
12718 move_fn_p (const_tree d
)
12720 gcc_assert (DECL_FUNCTION_MEMBER_P (d
));
12722 if (cxx_dialect
== cxx98
)
12723 /* There are no move constructors if we are in C++98 mode. */
12726 if (TREE_CODE (d
) == TEMPLATE_DECL
12727 || (DECL_TEMPLATE_INFO (d
)
12728 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d
))))
12729 /* Instantiations of template member functions are never move
12730 functions. Note that member functions of templated classes are
12731 represented as template functions internally, and we must
12732 accept those as move functions. */
12735 return move_signature_fn_p (d
);
12738 /* D is a constructor or overloaded `operator='.
12740 Then, this function returns true when D has the same signature as a move
12741 constructor or move assignment operator (because either it is such a
12742 ctor/op= or it is a template specialization with the same signature),
12743 false otherwise. */
12746 move_signature_fn_p (const_tree d
)
12750 bool result
= false;
12752 args
= FUNCTION_FIRST_USER_PARMTYPE (d
);
12756 arg_type
= TREE_VALUE (args
);
12757 if (arg_type
== error_mark_node
)
12760 if (TREE_CODE (arg_type
) == REFERENCE_TYPE
12761 && TYPE_REF_IS_RVALUE (arg_type
)
12762 && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (arg_type
)),
12766 args
= TREE_CHAIN (args
);
12768 if (args
&& args
!= void_list_node
&& !TREE_PURPOSE (args
))
12769 /* There are more non-optional args. */
12775 /* Remember any special properties of member function DECL. */
12778 grok_special_member_properties (tree decl
)
12782 if (!DECL_NONSTATIC_MEMBER_FUNCTION_P (decl
))
12785 class_type
= DECL_CONTEXT (decl
);
12786 if (IDENTIFIER_CTOR_P (DECL_NAME (decl
)))
12788 int ctor
= copy_fn_p (decl
);
12790 if (!DECL_ARTIFICIAL (decl
))
12791 TYPE_HAS_USER_CONSTRUCTOR (class_type
) = 1;
12797 A non-template constructor for class X is a copy
12798 constructor if its first parameter is of type X&, const
12799 X&, volatile X& or const volatile X&, and either there
12800 are no other parameters or else all other parameters have
12801 default arguments. */
12802 TYPE_HAS_COPY_CTOR (class_type
) = 1;
12803 if (user_provided_p (decl
))
12804 TYPE_HAS_COMPLEX_COPY_CTOR (class_type
) = 1;
12806 TYPE_HAS_CONST_COPY_CTOR (class_type
) = 1;
12808 else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl
)))
12809 TYPE_HAS_DEFAULT_CONSTRUCTOR (class_type
) = 1;
12810 else if (move_fn_p (decl
) && user_provided_p (decl
))
12811 TYPE_HAS_COMPLEX_MOVE_CTOR (class_type
) = 1;
12812 else if (is_list_ctor (decl
))
12813 TYPE_HAS_LIST_CTOR (class_type
) = 1;
12815 if (DECL_DECLARED_CONSTEXPR_P (decl
)
12816 && !ctor
&& !move_fn_p (decl
))
12817 TYPE_HAS_CONSTEXPR_CTOR (class_type
) = 1;
12819 else if (DECL_NAME (decl
) == cp_assignment_operator_id (NOP_EXPR
))
12823 A non-template assignment operator for class X is a copy
12824 assignment operator if its parameter is of type X, X&, const
12825 X&, volatile X& or const volatile X&. */
12827 int assop
= copy_fn_p (decl
);
12831 TYPE_HAS_COPY_ASSIGN (class_type
) = 1;
12832 if (user_provided_p (decl
))
12833 TYPE_HAS_COMPLEX_COPY_ASSIGN (class_type
) = 1;
12835 TYPE_HAS_CONST_COPY_ASSIGN (class_type
) = 1;
12837 else if (move_fn_p (decl
) && user_provided_p (decl
))
12838 TYPE_HAS_COMPLEX_MOVE_ASSIGN (class_type
) = 1;
12840 else if (IDENTIFIER_CONV_OP_P (DECL_NAME (decl
)))
12841 TYPE_HAS_CONVERSION (class_type
) = true;
12843 /* Destructors are handled in check_methods. */
12846 /* Check a constructor DECL has the correct form. Complains
12847 if the class has a constructor of the form X(X). */
12850 grok_ctor_properties (const_tree ctype
, const_tree decl
)
12852 int ctor_parm
= copy_fn_p (decl
);
12858 A declaration of a constructor for a class X is ill-formed if
12859 its first parameter is of type (optionally cv-qualified) X
12860 and either there are no other parameters or else all other
12861 parameters have default arguments.
12863 We *don't* complain about member template instantiations that
12864 have this form, though; they can occur as we try to decide
12865 what constructor to use during overload resolution. Since
12866 overload resolution will never prefer such a constructor to
12867 the non-template copy constructor (which is either explicitly
12868 or implicitly defined), there's no need to worry about their
12869 existence. Theoretically, they should never even be
12870 instantiated, but that's hard to forestall. */
12871 error ("invalid constructor; you probably meant %<%T (const %T&)%>",
12879 /* An operator with this code is unary, but can also be binary. */
12882 ambi_op_p (enum tree_code code
)
12884 return (code
== INDIRECT_REF
12885 || code
== ADDR_EXPR
12886 || code
== UNARY_PLUS_EXPR
12887 || code
== NEGATE_EXPR
12888 || code
== PREINCREMENT_EXPR
12889 || code
== PREDECREMENT_EXPR
);
12892 /* An operator with this name can only be unary. */
12895 unary_op_p (enum tree_code code
)
12897 return (code
== TRUTH_NOT_EXPR
12898 || code
== BIT_NOT_EXPR
12899 || code
== COMPONENT_REF
12900 || code
== TYPE_EXPR
);
12903 /* DECL is a declaration for an overloaded operator. If COMPLAIN is true,
12904 errors are issued for invalid declarations. */
12907 grok_op_properties (tree decl
, bool complain
)
12909 tree argtypes
= TYPE_ARG_TYPES (TREE_TYPE (decl
));
12910 int methodp
= (TREE_CODE (TREE_TYPE (decl
)) == METHOD_TYPE
);
12911 tree name
= DECL_NAME (decl
);
12913 tree class_type
= DECL_CONTEXT (decl
);
12914 if (class_type
&& !CLASS_TYPE_P (class_type
))
12915 class_type
= NULL_TREE
;
12917 enum tree_code operator_code
= ERROR_MARK
;
12918 if (IDENTIFIER_CONV_OP_P (name
))
12919 operator_code
= TYPE_EXPR
;
12922 /* It'd be nice to hang something else of the identifier to
12923 find CODE more directly. */
12924 bool assign_op
= IDENTIFIER_ASSIGN_OP_P (name
);
12925 const operator_name_info_t
*oni
12926 = (assign_op
? assignment_operator_name_info
: operator_name_info
);
12930 #define DEF_OPERATOR(NAME, CODE, MANGLING, ARITY, KIND) \
12931 else if (assign_op == (KIND == cik_assign_op) \
12932 && oni[int (CODE)].identifier == name) \
12933 operator_code = (CODE);
12934 #include "operators.def"
12935 #undef DEF_OPERATOR
12937 gcc_unreachable ();
12940 gcc_assert (operator_code
!= MAX_TREE_CODES
);
12941 SET_OVERLOADED_OPERATOR_CODE (decl
, operator_code
);
12943 if (operator_code
== NEW_EXPR
|| operator_code
== VEC_NEW_EXPR
12944 || operator_code
== DELETE_EXPR
|| operator_code
== VEC_DELETE_EXPR
)
12946 /* operator new and operator delete are quite special. */
12948 switch (operator_code
)
12951 TYPE_HAS_NEW_OPERATOR (class_type
) = 1;
12955 TYPE_GETS_DELETE (class_type
) |= 1;
12959 TYPE_HAS_ARRAY_NEW_OPERATOR (class_type
) = 1;
12962 case VEC_DELETE_EXPR
:
12963 TYPE_GETS_DELETE (class_type
) |= 2;
12967 gcc_unreachable ();
12970 /* [basic.std.dynamic.allocation]/1:
12972 A program is ill-formed if an allocation function is declared
12973 in a namespace scope other than global scope or declared
12974 static in global scope.
12976 The same also holds true for deallocation functions. */
12977 if (DECL_NAMESPACE_SCOPE_P (decl
))
12979 if (CP_DECL_CONTEXT (decl
) != global_namespace
)
12981 error ("%qD may not be declared within a namespace", decl
);
12985 if (!TREE_PUBLIC (decl
))
12987 error ("%qD may not be declared as static", decl
);
12992 if (operator_code
== DELETE_EXPR
|| operator_code
== VEC_DELETE_EXPR
)
12993 TREE_TYPE (decl
) = coerce_delete_type (TREE_TYPE (decl
));
12996 TREE_TYPE (decl
) = coerce_new_type (TREE_TYPE (decl
));
12997 DECL_IS_OPERATOR_NEW (decl
) = 1;
13003 /* An operator function must either be a non-static member function
13004 or have at least one parameter of a class, a reference to a class,
13005 an enumeration, or a reference to an enumeration. 13.4.0.6 */
13006 if (! methodp
|| DECL_STATIC_FUNCTION_P (decl
))
13008 if (operator_code
== TYPE_EXPR
13009 || operator_code
== CALL_EXPR
13010 || operator_code
== COMPONENT_REF
13011 || operator_code
== ARRAY_REF
13012 || operator_code
== NOP_EXPR
)
13014 error ("%qD must be a nonstatic member function", decl
);
13018 if (DECL_STATIC_FUNCTION_P (decl
))
13020 error ("%qD must be either a non-static member "
13021 "function or a non-member function", decl
);
13025 for (tree arg
= argtypes
; ; arg
= TREE_CHAIN (arg
))
13027 if (!arg
|| arg
== void_list_node
)
13030 error ("%qD must have an argument of class or "
13031 "enumerated type", decl
);
13035 tree type
= non_reference (TREE_VALUE (arg
));
13036 if (type
== error_mark_node
)
13039 /* MAYBE_CLASS_TYPE_P, rather than CLASS_TYPE_P, is used
13040 because these checks are performed even on template
13042 if (MAYBE_CLASS_TYPE_P (type
)
13043 || TREE_CODE (type
) == ENUMERAL_TYPE
)
13048 /* There are no restrictions on the arguments to an overloaded
13050 if (operator_code
== CALL_EXPR
)
13053 if (operator_code
== COND_EXPR
)
13056 error ("ISO C++ prohibits overloading operator ?:");
13060 /* Count the number of arguments and check for ellipsis. */
13062 for (tree arg
= argtypes
; arg
!= void_list_node
; arg
= TREE_CHAIN (arg
))
13067 error ("%qD must not have variable number of arguments", decl
);
13073 /* Verify correct number of arguments. */
13074 if (ambi_op_p (operator_code
))
13077 /* We pick the one-argument operator codes by default, so
13078 we don't have to change anything. */
13080 else if (arity
== 2)
13082 /* If we thought this was a unary operator, we now know
13083 it to be a binary operator. */
13084 switch (operator_code
)
13087 operator_code
= MULT_EXPR
;
13091 operator_code
= BIT_AND_EXPR
;
13094 case UNARY_PLUS_EXPR
:
13095 operator_code
= PLUS_EXPR
;
13099 operator_code
= MINUS_EXPR
;
13102 case PREINCREMENT_EXPR
:
13103 operator_code
= POSTINCREMENT_EXPR
;
13106 case PREDECREMENT_EXPR
:
13107 operator_code
= POSTDECREMENT_EXPR
;
13111 gcc_unreachable ();
13114 SET_OVERLOADED_OPERATOR_CODE (decl
, operator_code
);
13116 if ((operator_code
== POSTINCREMENT_EXPR
13117 || operator_code
== POSTDECREMENT_EXPR
)
13118 && ! processing_template_decl
13119 && ! same_type_p (TREE_VALUE (TREE_CHAIN (argtypes
)), integer_type_node
))
13122 ? G_("postfix %qD must have %<int%> as its argument")
13123 : G_("postfix %qD must have %<int%> as its second argument"),
13131 ? G_("%qD must have either zero or one argument")
13132 : G_("%qD must have either one or two arguments"), decl
);
13136 else if (unary_op_p (operator_code
))
13141 ? G_("%qD must have no arguments")
13142 : G_("%qD must have exactly one argument"), decl
);
13151 ? G_("%qD must have exactly one argument")
13152 : G_("%qD must have exactly two arguments"), decl
);
13157 /* There can be no default arguments. */
13158 for (tree arg
= argtypes
; arg
!= void_list_node
; arg
= TREE_CHAIN (arg
))
13159 if (TREE_PURPOSE (arg
))
13161 TREE_PURPOSE (arg
) = NULL_TREE
;
13162 if (operator_code
== POSTINCREMENT_EXPR
13163 || operator_code
== POSTDECREMENT_EXPR
)
13164 pedwarn (input_location
, OPT_Wpedantic
,
13165 "%qD cannot have default arguments", decl
);
13168 error ("%qD cannot have default arguments", decl
);
13173 /* At this point the declaration is well-formed. It may not be
13174 sensible though. */
13176 /* Check member function warnings only on the in-class declaration.
13177 There's no point warning on an out-of-class definition. */
13178 if (class_type
&& class_type
!= current_class_type
)
13181 /* Warn about conversion operators that will never be used. */
13182 if (IDENTIFIER_CONV_OP_P (name
)
13183 && ! DECL_TEMPLATE_INFO (decl
)
13184 && warn_conversion
)
13186 tree t
= TREE_TYPE (name
);
13187 int ref
= (TREE_CODE (t
) == REFERENCE_TYPE
);
13190 t
= TYPE_MAIN_VARIANT (TREE_TYPE (t
));
13192 if (VOID_TYPE_P (t
))
13193 warning (OPT_Wconversion
,
13195 ? G_("conversion to a reference to void "
13196 "will never use a type conversion operator")
13197 : G_("conversion to void "
13198 "will never use a type conversion operator"));
13199 else if (class_type
)
13201 if (t
== class_type
)
13202 warning (OPT_Wconversion
,
13204 ? G_("conversion to a reference to the same type "
13205 "will never use a type conversion operator")
13206 : G_("conversion to the same type "
13207 "will never use a type conversion operator"));
13208 /* Don't force t to be complete here. */
13209 else if (MAYBE_CLASS_TYPE_P (t
)
13210 && COMPLETE_TYPE_P (t
)
13211 && DERIVED_FROM_P (t
, class_type
))
13212 warning (OPT_Wconversion
,
13214 ? G_("conversion to a reference to a base class "
13215 "will never use a type conversion operator")
13216 : G_("conversion to a base class "
13217 "will never use a type conversion operator"));
13224 /* Effective C++ rules below. */
13226 /* More Effective C++ rule 7. */
13227 if (operator_code
== TRUTH_ANDIF_EXPR
13228 || operator_code
== TRUTH_ORIF_EXPR
13229 || operator_code
== COMPOUND_EXPR
)
13230 warning (OPT_Weffc__
,
13231 "user-defined %qD always evaluates both arguments", decl
);
13233 /* More Effective C++ rule 6. */
13234 if (operator_code
== POSTINCREMENT_EXPR
13235 || operator_code
== POSTDECREMENT_EXPR
13236 || operator_code
== PREINCREMENT_EXPR
13237 || operator_code
== PREDECREMENT_EXPR
)
13239 tree arg
= TREE_VALUE (argtypes
);
13240 tree ret
= TREE_TYPE (TREE_TYPE (decl
));
13241 if (methodp
|| TREE_CODE (arg
) == REFERENCE_TYPE
)
13242 arg
= TREE_TYPE (arg
);
13243 arg
= TYPE_MAIN_VARIANT (arg
);
13245 if (operator_code
== PREINCREMENT_EXPR
13246 || operator_code
== PREDECREMENT_EXPR
)
13248 if (TREE_CODE (ret
) != REFERENCE_TYPE
13249 || !same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (ret
)), arg
))
13250 warning (OPT_Weffc__
, "prefix %qD should return %qT", decl
,
13251 build_reference_type (arg
));
13255 if (!same_type_p (TYPE_MAIN_VARIANT (ret
), arg
))
13256 warning (OPT_Weffc__
, "postfix %qD should return %qT", decl
, arg
);
13260 /* Effective C++ rule 23. */
13261 if (!DECL_ASSIGNMENT_OPERATOR_P (decl
)
13262 && (operator_code
== PLUS_EXPR
13263 || operator_code
== MINUS_EXPR
13264 || operator_code
== TRUNC_DIV_EXPR
13265 || operator_code
== MULT_EXPR
13266 || operator_code
== TRUNC_MOD_EXPR
)
13267 && TREE_CODE (TREE_TYPE (TREE_TYPE (decl
))) == REFERENCE_TYPE
)
13268 warning (OPT_Weffc__
, "%qD should return by value", decl
);
13273 /* Return a string giving the keyword associate with CODE. */
13275 static const char *
13276 tag_name (enum tag_types code
)
13288 case typename_type
:
13291 gcc_unreachable ();
13295 /* Name lookup in an elaborated-type-specifier (after the keyword
13296 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
13297 elaborated-type-specifier is invalid, issue a diagnostic and return
13298 error_mark_node; otherwise, return the *_TYPE to which it referred.
13299 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
13302 check_elaborated_type_specifier (enum tag_types tag_code
,
13304 bool allow_template_p
)
13310 struct S { struct S *p; };
13312 name lookup will find the TYPE_DECL for the implicit "S::S"
13313 typedef. Adjust for that here. */
13314 if (DECL_SELF_REFERENCE_P (decl
))
13315 decl
= TYPE_NAME (TREE_TYPE (decl
));
13317 type
= TREE_TYPE (decl
);
13319 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
13320 is false for this case as well. */
13321 if (TREE_CODE (type
) == TEMPLATE_TYPE_PARM
)
13323 error ("using template type parameter %qT after %qs",
13324 type
, tag_name (tag_code
));
13325 return error_mark_node
;
13327 /* Accept template template parameters. */
13328 else if (allow_template_p
13329 && (TREE_CODE (type
) == BOUND_TEMPLATE_TEMPLATE_PARM
13330 || TREE_CODE (type
) == TEMPLATE_TEMPLATE_PARM
))
13334 If the identifier resolves to a typedef-name or the
13335 simple-template-id resolves to an alias template
13336 specialization, the elaborated-type-specifier is ill-formed.
13338 In other words, the only legitimate declaration to use in the
13339 elaborated type specifier is the implicit typedef created when
13340 the type is declared. */
13341 else if (!DECL_IMPLICIT_TYPEDEF_P (decl
)
13342 && !DECL_SELF_REFERENCE_P (decl
)
13343 && tag_code
!= typename_type
)
13345 if (alias_template_specialization_p (type
))
13346 error ("using alias template specialization %qT after %qs",
13347 type
, tag_name (tag_code
));
13349 error ("using typedef-name %qD after %qs", decl
, tag_name (tag_code
));
13350 inform (DECL_SOURCE_LOCATION (decl
),
13351 "%qD has a previous declaration here", decl
);
13352 return error_mark_node
;
13354 else if (TREE_CODE (type
) != RECORD_TYPE
13355 && TREE_CODE (type
) != UNION_TYPE
13356 && tag_code
!= enum_type
13357 && tag_code
!= typename_type
)
13359 error ("%qT referred to as %qs", type
, tag_name (tag_code
));
13360 inform (location_of (type
), "%qT has a previous declaration here", type
);
13361 return error_mark_node
;
13363 else if (TREE_CODE (type
) != ENUMERAL_TYPE
13364 && tag_code
== enum_type
)
13366 error ("%qT referred to as enum", type
);
13367 inform (location_of (type
), "%qT has a previous declaration here", type
);
13368 return error_mark_node
;
13370 else if (!allow_template_p
13371 && TREE_CODE (type
) == RECORD_TYPE
13372 && CLASSTYPE_IS_TEMPLATE (type
))
13374 /* If a class template appears as elaborated type specifier
13375 without a template header such as:
13377 template <class T> class C {};
13378 void f(class C); // No template header here
13380 then the required template argument is missing. */
13381 error ("template argument required for %<%s %T%>",
13382 tag_name (tag_code
),
13383 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type
)));
13384 return error_mark_node
;
13390 /* Lookup NAME in elaborate type specifier in scope according to
13391 SCOPE and issue diagnostics if necessary.
13392 Return *_TYPE node upon success, NULL_TREE when the NAME is not
13393 found, and ERROR_MARK_NODE for type error. */
13396 lookup_and_check_tag (enum tag_types tag_code
, tree name
,
13397 tag_scope scope
, bool template_header_p
)
13401 if (scope
== ts_global
)
13403 /* First try ordinary name lookup, ignoring hidden class name
13404 injected via friend declaration. */
13405 decl
= lookup_name_prefer_type (name
, 2);
13406 decl
= strip_using_decl (decl
);
13407 /* If that fails, the name will be placed in the smallest
13408 non-class, non-function-prototype scope according to 3.3.1/5.
13409 We may already have a hidden name declared as friend in this
13410 scope. So lookup again but not ignoring hidden names.
13411 If we find one, that name will be made visible rather than
13412 creating a new tag. */
13414 decl
= lookup_type_scope (name
, ts_within_enclosing_non_class
);
13417 decl
= lookup_type_scope (name
, scope
);
13420 && (DECL_CLASS_TEMPLATE_P (decl
)
13421 /* If scope is ts_current we're defining a class, so ignore a
13422 template template parameter. */
13423 || (scope
!= ts_current
13424 && DECL_TEMPLATE_TEMPLATE_PARM_P (decl
))))
13425 decl
= DECL_TEMPLATE_RESULT (decl
);
13427 if (decl
&& TREE_CODE (decl
) == TYPE_DECL
)
13429 /* Look for invalid nested type:
13433 if (scope
== ts_current
&& DECL_SELF_REFERENCE_P (decl
))
13435 error ("%qD has the same name as the class in which it is "
13438 return error_mark_node
;
13441 /* Two cases we need to consider when deciding if a class
13442 template is allowed as an elaborated type specifier:
13443 1. It is a self reference to its own class.
13444 2. It comes with a template header.
13448 template <class T> class C {
13449 class C *c1; // DECL_SELF_REFERENCE_P is true
13452 template <class U> class C; // template_header_p is true
13453 template <class T> class C<T>::D {
13454 class C *c2; // DECL_SELF_REFERENCE_P is true
13457 t
= check_elaborated_type_specifier (tag_code
,
13460 | DECL_SELF_REFERENCE_P (decl
));
13461 if (template_header_p
&& t
&& CLASS_TYPE_P (t
)
13462 && (!CLASSTYPE_TEMPLATE_INFO (t
)
13463 || (!PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (t
)))))
13465 error ("%qT is not a template", t
);
13466 inform (location_of (t
), "previous declaration here");
13467 if (TYPE_CLASS_SCOPE_P (t
)
13468 && CLASSTYPE_TEMPLATE_INFO (TYPE_CONTEXT (t
)))
13469 inform (input_location
,
13470 "perhaps you want to explicitly add %<%T::%>",
13472 t
= error_mark_node
;
13477 else if (decl
&& TREE_CODE (decl
) == TREE_LIST
)
13479 error ("reference to %qD is ambiguous", name
);
13480 print_candidates (decl
);
13481 return error_mark_node
;
13487 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
13488 Define the tag as a forward-reference if it is not defined.
13490 If a declaration is given, process it here, and report an error if
13491 multiple declarations are not identical.
13493 SCOPE is TS_CURRENT when this is also a definition. Only look in
13494 the current frame for the name (since C++ allows new names in any
13495 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
13496 declaration. Only look beginning from the current scope outward up
13497 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
13499 TEMPLATE_HEADER_P is true when this declaration is preceded by
13500 a set of template parameters. */
13503 xref_tag_1 (enum tag_types tag_code
, tree name
,
13504 tag_scope scope
, bool template_header_p
)
13506 enum tree_code code
;
13507 tree context
= NULL_TREE
;
13509 gcc_assert (identifier_p (name
));
13515 code
= RECORD_TYPE
;
13521 code
= ENUMERAL_TYPE
;
13524 gcc_unreachable ();
13527 /* In case of anonymous name, xref_tag is only called to
13528 make type node and push name. Name lookup is not required. */
13529 tree t
= NULL_TREE
;
13530 if (scope
!= ts_lambda
&& !anon_aggrname_p (name
))
13531 t
= lookup_and_check_tag (tag_code
, name
, scope
, template_header_p
);
13533 if (t
== error_mark_node
)
13534 return error_mark_node
;
13536 if (scope
!= ts_current
&& t
&& current_class_type
13537 && template_class_depth (current_class_type
)
13538 && template_header_p
)
13540 if (TREE_CODE (t
) == TEMPLATE_TEMPLATE_PARM
)
13543 /* Since SCOPE is not TS_CURRENT, we are not looking at a
13544 definition of this tag. Since, in addition, we are currently
13545 processing a (member) template declaration of a template
13546 class, we must be very careful; consider:
13553 { template <class V>
13554 friend struct S1; };
13556 Here, the S2::S1 declaration should not be confused with the
13557 outer declaration. In particular, the inner version should
13558 have a template parameter of level 2, not level 1. This
13559 would be particularly important if the member declaration
13562 template <class V = U> friend struct S1;
13564 say, when we should tsubst into `U' when instantiating
13565 S2. On the other hand, when presented with:
13575 we must find the inner binding eventually. We
13576 accomplish this by making sure that the new type we
13577 create to represent this declaration has the right
13579 context
= TYPE_CONTEXT (t
);
13585 /* If no such tag is yet defined, create a forward-reference node
13586 and record it as the "definition".
13587 When a real declaration of this type is found,
13588 the forward-reference will be altered into a real type. */
13589 if (code
== ENUMERAL_TYPE
)
13591 error ("use of enum %q#D without previous declaration", name
);
13592 return error_mark_node
;
13596 t
= make_class_type (code
);
13597 TYPE_CONTEXT (t
) = context
;
13598 if (scope
== ts_lambda
)
13599 /* Mark it as a lambda type. */
13600 CLASSTYPE_LAMBDA_EXPR (t
) = error_mark_node
;
13601 t
= pushtag (name
, t
, scope
);
13606 if (template_header_p
&& MAYBE_CLASS_TYPE_P (t
))
13608 /* Check that we aren't trying to overload a class with different
13610 tree constr
= NULL_TREE
;
13611 if (current_template_parms
)
13613 tree reqs
= TEMPLATE_PARMS_CONSTRAINTS (current_template_parms
);
13614 constr
= build_constraints (reqs
, NULL_TREE
);
13616 if (!redeclare_class_template (t
, current_template_parms
, constr
))
13617 return error_mark_node
;
13619 else if (!processing_template_decl
13620 && CLASS_TYPE_P (t
)
13621 && CLASSTYPE_IS_TEMPLATE (t
))
13623 error ("redeclaration of %qT as a non-template", t
);
13624 inform (location_of (t
), "previous declaration %qD", t
);
13625 return error_mark_node
;
13628 /* Make injected friend class visible. */
13629 if (scope
!= ts_within_enclosing_non_class
&& TYPE_HIDDEN_P (t
))
13631 tree decl
= TYPE_NAME (t
);
13633 DECL_ANTICIPATED (decl
) = false;
13634 DECL_FRIEND_P (decl
) = false;
13636 if (TYPE_TEMPLATE_INFO (t
))
13638 tree tmpl
= TYPE_TI_TEMPLATE (t
);
13639 DECL_ANTICIPATED (tmpl
) = false;
13640 DECL_FRIEND_P (tmpl
) = false;
13648 /* Wrapper for xref_tag_1. */
13651 xref_tag (enum tag_types tag_code
, tree name
,
13652 tag_scope scope
, bool template_header_p
)
13656 subtime
= timevar_cond_start (TV_NAME_LOOKUP
);
13657 ret
= xref_tag_1 (tag_code
, name
, scope
, template_header_p
);
13658 timevar_cond_stop (TV_NAME_LOOKUP
, subtime
);
13664 xref_tag_from_type (tree old
, tree id
, tag_scope scope
)
13666 enum tag_types tag_kind
;
13668 if (TREE_CODE (old
) == RECORD_TYPE
)
13669 tag_kind
= (CLASSTYPE_DECLARED_CLASS (old
) ? class_type
: record_type
);
13671 tag_kind
= union_type
;
13673 if (id
== NULL_TREE
)
13674 id
= TYPE_IDENTIFIER (old
);
13676 return xref_tag (tag_kind
, id
, scope
, false);
13679 /* Create the binfo hierarchy for REF with (possibly NULL) base list
13680 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
13681 access_* node, and the TREE_VALUE is the type of the base-class.
13682 Non-NULL TREE_TYPE indicates virtual inheritance. */
13685 xref_basetypes (tree ref
, tree base_list
)
13688 tree binfo
, base_binfo
;
13689 unsigned max_vbases
= 0; /* Maximum direct & indirect virtual bases. */
13690 unsigned max_bases
= 0; /* Maximum direct bases. */
13691 unsigned max_dvbases
= 0; /* Maximum direct virtual bases. */
13693 tree default_access
;
13694 tree igo_prev
; /* Track Inheritance Graph Order. */
13696 if (ref
== error_mark_node
)
13699 /* The base of a derived class is private by default, all others are
13701 default_access
= (TREE_CODE (ref
) == RECORD_TYPE
13702 && CLASSTYPE_DECLARED_CLASS (ref
)
13703 ? access_private_node
: access_public_node
);
13705 /* First, make sure that any templates in base-classes are
13706 instantiated. This ensures that if we call ourselves recursively
13707 we do not get confused about which classes are marked and which
13709 basep
= &base_list
;
13712 tree basetype
= TREE_VALUE (*basep
);
13714 /* The dependent_type_p call below should really be dependent_scope_p
13715 so that we give a hard error about using an incomplete type as a
13716 base, but we allow it with a pedwarn for backward
13718 if (processing_template_decl
13719 && CLASS_TYPE_P (basetype
) && TYPE_BEING_DEFINED (basetype
))
13720 cxx_incomplete_type_diagnostic (NULL_TREE
, basetype
, DK_PEDWARN
);
13721 if (!dependent_type_p (basetype
)
13722 && !complete_type_or_else (basetype
, NULL
))
13723 /* An incomplete type. Remove it from the list. */
13724 *basep
= TREE_CHAIN (*basep
);
13728 if (TREE_TYPE (*basep
))
13730 if (CLASS_TYPE_P (basetype
))
13731 max_vbases
+= vec_safe_length (CLASSTYPE_VBASECLASSES (basetype
));
13732 basep
= &TREE_CHAIN (*basep
);
13735 max_vbases
+= max_dvbases
;
13737 TYPE_MARKED_P (ref
) = 1;
13739 /* The binfo slot should be empty, unless this is an (ill-formed)
13741 gcc_assert (!TYPE_BINFO (ref
) || TYPE_SIZE (ref
));
13743 gcc_assert (TYPE_MAIN_VARIANT (ref
) == ref
);
13745 binfo
= make_tree_binfo (max_bases
);
13747 TYPE_BINFO (ref
) = binfo
;
13748 BINFO_OFFSET (binfo
) = size_zero_node
;
13749 BINFO_TYPE (binfo
) = ref
;
13751 /* Apply base-class info set up to the variants of this type. */
13752 fixup_type_variants (ref
);
13756 vec_alloc (BINFO_BASE_ACCESSES (binfo
), max_bases
);
13757 /* A C++98 POD cannot have base classes. */
13758 CLASSTYPE_NON_LAYOUT_POD_P (ref
) = true;
13760 if (TREE_CODE (ref
) == UNION_TYPE
)
13761 error ("derived union %qT invalid", ref
);
13765 warning (OPT_Wmultiple_inheritance
,
13766 "%qT defined with multiple direct bases", ref
);
13770 /* An aggregate can't have virtual base classes. */
13771 CLASSTYPE_NON_AGGREGATE (ref
) = true;
13773 vec_alloc (CLASSTYPE_VBASECLASSES (ref
), max_vbases
);
13776 warning (OPT_Wvirtual_inheritance
,
13777 "%qT defined with direct virtual base", ref
);
13780 for (igo_prev
= binfo
; base_list
; base_list
= TREE_CHAIN (base_list
))
13782 tree access
= TREE_PURPOSE (base_list
);
13783 int via_virtual
= TREE_TYPE (base_list
) != NULL_TREE
;
13784 tree basetype
= TREE_VALUE (base_list
);
13786 if (access
== access_default_node
)
13787 access
= default_access
;
13789 /* Before C++17, an aggregate cannot have base classes. In C++17, an
13790 aggregate can't have virtual, private, or protected base classes. */
13791 if (cxx_dialect
< cxx17
13792 || access
!= access_public_node
13794 CLASSTYPE_NON_AGGREGATE (ref
) = true;
13796 if (PACK_EXPANSION_P (basetype
))
13797 basetype
= PACK_EXPANSION_PATTERN (basetype
);
13798 if (TREE_CODE (basetype
) == TYPE_DECL
)
13799 basetype
= TREE_TYPE (basetype
);
13800 if (!MAYBE_CLASS_TYPE_P (basetype
) || TREE_CODE (basetype
) == UNION_TYPE
)
13802 error ("base type %qT fails to be a struct or class type",
13807 base_binfo
= NULL_TREE
;
13808 if (CLASS_TYPE_P (basetype
) && !dependent_scope_p (basetype
))
13810 base_binfo
= TYPE_BINFO (basetype
);
13811 /* The original basetype could have been a typedef'd type. */
13812 basetype
= BINFO_TYPE (base_binfo
);
13814 /* Inherit flags from the base. */
13815 TYPE_HAS_NEW_OPERATOR (ref
)
13816 |= TYPE_HAS_NEW_OPERATOR (basetype
);
13817 TYPE_HAS_ARRAY_NEW_OPERATOR (ref
)
13818 |= TYPE_HAS_ARRAY_NEW_OPERATOR (basetype
);
13819 TYPE_GETS_DELETE (ref
) |= TYPE_GETS_DELETE (basetype
);
13820 TYPE_HAS_CONVERSION (ref
) |= TYPE_HAS_CONVERSION (basetype
);
13821 CLASSTYPE_DIAMOND_SHAPED_P (ref
)
13822 |= CLASSTYPE_DIAMOND_SHAPED_P (basetype
);
13823 CLASSTYPE_REPEATED_BASE_P (ref
)
13824 |= CLASSTYPE_REPEATED_BASE_P (basetype
);
13827 /* We must do this test after we've seen through a typedef
13829 if (TYPE_MARKED_P (basetype
))
13831 if (basetype
== ref
)
13832 error ("recursive type %qT undefined", basetype
);
13834 error ("duplicate base type %qT invalid", basetype
);
13838 if (PACK_EXPANSION_P (TREE_VALUE (base_list
)))
13839 /* Regenerate the pack expansion for the bases. */
13840 basetype
= make_pack_expansion (basetype
);
13842 TYPE_MARKED_P (basetype
) = 1;
13844 base_binfo
= copy_binfo (base_binfo
, basetype
, ref
,
13845 &igo_prev
, via_virtual
);
13846 if (!BINFO_INHERITANCE_CHAIN (base_binfo
))
13847 BINFO_INHERITANCE_CHAIN (base_binfo
) = binfo
;
13849 BINFO_BASE_APPEND (binfo
, base_binfo
);
13850 BINFO_BASE_ACCESS_APPEND (binfo
, access
);
13854 /* Update max_vbases to reflect the reality that we are dropping
13855 this base: if it reaches zero we want to undo the vec_alloc
13856 above to avoid inconsistencies during error-recovery: eg, in
13857 build_special_member_call, CLASSTYPE_VBASECLASSES non null
13858 and vtt null (c++/27952). */
13861 if (CLASS_TYPE_P (basetype
))
13863 -= vec_safe_length (CLASSTYPE_VBASECLASSES (basetype
));
13866 if (CLASSTYPE_VBASECLASSES (ref
)
13867 && max_vbases
== 0)
13868 vec_free (CLASSTYPE_VBASECLASSES (ref
));
13870 if (vec_safe_length (CLASSTYPE_VBASECLASSES (ref
)) < max_vbases
)
13871 /* If we didn't get max_vbases vbases, we must have shared at
13872 least one of them, and are therefore diamond shaped. */
13873 CLASSTYPE_DIAMOND_SHAPED_P (ref
) = 1;
13875 /* Unmark all the types. */
13876 for (i
= 0; BINFO_BASE_ITERATE (binfo
, i
, base_binfo
); i
++)
13877 TYPE_MARKED_P (BINFO_TYPE (base_binfo
)) = 0;
13878 TYPE_MARKED_P (ref
) = 0;
13880 /* Now see if we have a repeated base type. */
13881 if (!CLASSTYPE_REPEATED_BASE_P (ref
))
13883 for (base_binfo
= binfo
; base_binfo
;
13884 base_binfo
= TREE_CHAIN (base_binfo
))
13886 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo
)))
13888 CLASSTYPE_REPEATED_BASE_P (ref
) = 1;
13891 TYPE_MARKED_P (BINFO_TYPE (base_binfo
)) = 1;
13893 for (base_binfo
= binfo
; base_binfo
;
13894 base_binfo
= TREE_CHAIN (base_binfo
))
13895 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo
)))
13896 TYPE_MARKED_P (BINFO_TYPE (base_binfo
)) = 0;
13903 /* Copies the enum-related properties from type SRC to type DST.
13904 Used with the underlying type of an enum and the enum itself. */
13906 copy_type_enum (tree dst
, tree src
)
13909 for (t
= dst
; t
; t
= TYPE_NEXT_VARIANT (t
))
13911 TYPE_MIN_VALUE (t
) = TYPE_MIN_VALUE (src
);
13912 TYPE_MAX_VALUE (t
) = TYPE_MAX_VALUE (src
);
13913 TYPE_SIZE (t
) = TYPE_SIZE (src
);
13914 TYPE_SIZE_UNIT (t
) = TYPE_SIZE_UNIT (src
);
13915 SET_TYPE_MODE (dst
, TYPE_MODE (src
));
13916 TYPE_PRECISION (t
) = TYPE_PRECISION (src
);
13917 unsigned valign
= TYPE_ALIGN (src
);
13918 if (TYPE_USER_ALIGN (t
))
13919 valign
= MAX (valign
, TYPE_ALIGN (t
));
13921 TYPE_USER_ALIGN (t
) = TYPE_USER_ALIGN (src
);
13922 SET_TYPE_ALIGN (t
, valign
);
13923 TYPE_UNSIGNED (t
) = TYPE_UNSIGNED (src
);
13927 /* Begin compiling the definition of an enumeration type.
13930 if ENUMTYPE is not NULL_TREE then the type has alredy been found.
13932 UNDERLYING_TYPE is the type that will be used as the storage for
13933 the enumeration type. This should be NULL_TREE if no storage type
13936 ATTRIBUTES are any attributes specified after the enum-key.
13938 SCOPED_ENUM_P is true if this is a scoped enumeration type.
13940 if IS_NEW is not NULL, gets TRUE iff a new type is created.
13942 Returns the type object, as yet incomplete.
13943 Also records info about it so that build_enumerator
13944 may be used to declare the individual values as they are read. */
13947 start_enum (tree name
, tree enumtype
, tree underlying_type
,
13948 tree attributes
, bool scoped_enum_p
, bool *is_new
)
13950 tree prevtype
= NULL_TREE
;
13951 gcc_assert (identifier_p (name
));
13955 /* [C++0x dcl.enum]p5:
13957 If not explicitly specified, the underlying type of a scoped
13958 enumeration type is int. */
13959 if (!underlying_type
&& scoped_enum_p
)
13960 underlying_type
= integer_type_node
;
13962 if (underlying_type
)
13963 underlying_type
= cv_unqualified (underlying_type
);
13965 /* If this is the real definition for a previous forward reference,
13966 fill in the contents in the same object that used to be the
13967 forward reference. */
13969 enumtype
= lookup_and_check_tag (enum_type
, name
,
13970 /*tag_scope=*/ts_current
,
13971 /*template_header_p=*/false);
13973 /* In case of a template_decl, the only check that should be deferred
13974 to instantiation time is the comparison of underlying types. */
13975 if (enumtype
&& TREE_CODE (enumtype
) == ENUMERAL_TYPE
)
13977 if (scoped_enum_p
!= SCOPED_ENUM_P (enumtype
))
13979 error_at (input_location
, "scoped/unscoped mismatch "
13980 "in enum %q#T", enumtype
);
13981 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype
)),
13982 "previous definition here");
13983 enumtype
= error_mark_node
;
13985 else if (ENUM_FIXED_UNDERLYING_TYPE_P (enumtype
) != !! underlying_type
)
13987 error_at (input_location
, "underlying type mismatch "
13988 "in enum %q#T", enumtype
);
13989 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype
)),
13990 "previous definition here");
13991 enumtype
= error_mark_node
;
13993 else if (underlying_type
&& ENUM_UNDERLYING_TYPE (enumtype
)
13994 && !dependent_type_p (underlying_type
)
13995 && !dependent_type_p (ENUM_UNDERLYING_TYPE (enumtype
))
13996 && !same_type_p (underlying_type
,
13997 ENUM_UNDERLYING_TYPE (enumtype
)))
13999 error_at (input_location
, "different underlying type "
14000 "in enum %q#T", enumtype
);
14001 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype
)),
14002 "previous definition here");
14003 underlying_type
= NULL_TREE
;
14007 if (!enumtype
|| TREE_CODE (enumtype
) != ENUMERAL_TYPE
14008 || processing_template_decl
)
14010 /* In case of error, make a dummy enum to allow parsing to
14012 if (enumtype
== error_mark_node
)
14014 name
= make_anon_name ();
14015 enumtype
= NULL_TREE
;
14018 /* enumtype may be an ENUMERAL_TYPE if this is a redefinition
14019 of an opaque enum, or an opaque enum of an already defined
14020 enumeration (C++0x only).
14021 In any other case, it'll be NULL_TREE. */
14027 prevtype
= enumtype
;
14029 /* Do not push the decl more than once, unless we need to
14030 compare underlying types at instantiation time */
14032 || TREE_CODE (enumtype
) != ENUMERAL_TYPE
14033 || (underlying_type
14034 && dependent_type_p (underlying_type
))
14035 || (ENUM_UNDERLYING_TYPE (enumtype
)
14036 && dependent_type_p (ENUM_UNDERLYING_TYPE (enumtype
))))
14038 enumtype
= cxx_make_type (ENUMERAL_TYPE
);
14039 enumtype
= pushtag (name
, enumtype
, /*tag_scope=*/ts_current
);
14041 /* std::byte aliases anything. */
14042 if (enumtype
!= error_mark_node
14043 && TYPE_CONTEXT (enumtype
) == std_node
14044 && !strcmp ("byte", TYPE_NAME_STRING (enumtype
)))
14045 TYPE_ALIAS_SET (enumtype
) = 0;
14048 enumtype
= xref_tag (enum_type
, name
, /*tag_scope=*/ts_current
,
14051 if (enumtype
== error_mark_node
)
14052 return error_mark_node
;
14054 /* The enum is considered opaque until the opening '{' of the
14055 enumerator list. */
14056 SET_OPAQUE_ENUM_P (enumtype
, true);
14057 ENUM_FIXED_UNDERLYING_TYPE_P (enumtype
) = !! underlying_type
;
14060 SET_SCOPED_ENUM_P (enumtype
, scoped_enum_p
);
14062 cplus_decl_attributes (&enumtype
, attributes
, (int)ATTR_FLAG_TYPE_IN_PLACE
);
14064 if (underlying_type
)
14066 if (ENUM_UNDERLYING_TYPE (enumtype
))
14067 /* We already checked that it matches, don't change it to a different
14068 typedef variant. */;
14069 else if (CP_INTEGRAL_TYPE_P (underlying_type
))
14071 copy_type_enum (enumtype
, underlying_type
);
14072 ENUM_UNDERLYING_TYPE (enumtype
) = underlying_type
;
14074 else if (dependent_type_p (underlying_type
))
14075 ENUM_UNDERLYING_TYPE (enumtype
) = underlying_type
;
14077 error ("underlying type %qT of %qT must be an integral type",
14078 underlying_type
, enumtype
);
14081 /* If into a template class, the returned enum is always the first
14082 declaration (opaque or not) seen. This way all the references to
14083 this type will be to the same declaration. The following ones are used
14084 only to check for definition errors. */
14085 if (prevtype
&& processing_template_decl
)
14091 /* After processing and defining all the values of an enumeration type,
14092 install their decls in the enumeration type.
14093 ENUMTYPE is the type object. */
14096 finish_enum_value_list (tree enumtype
)
14099 tree underlying_type
;
14102 tree minnode
, maxnode
;
14105 bool fixed_underlying_type_p
14106 = ENUM_UNDERLYING_TYPE (enumtype
) != NULL_TREE
;
14108 /* We built up the VALUES in reverse order. */
14109 TYPE_VALUES (enumtype
) = nreverse (TYPE_VALUES (enumtype
));
14111 /* For an enum defined in a template, just set the type of the values;
14112 all further processing is postponed until the template is
14113 instantiated. We need to set the type so that tsubst of a CONST_DECL
14115 if (processing_template_decl
)
14117 for (values
= TYPE_VALUES (enumtype
);
14119 values
= TREE_CHAIN (values
))
14120 TREE_TYPE (TREE_VALUE (values
)) = enumtype
;
14124 /* Determine the minimum and maximum values of the enumerators. */
14125 if (TYPE_VALUES (enumtype
))
14127 minnode
= maxnode
= NULL_TREE
;
14129 for (values
= TYPE_VALUES (enumtype
);
14131 values
= TREE_CHAIN (values
))
14133 decl
= TREE_VALUE (values
);
14135 /* [dcl.enum]: Following the closing brace of an enum-specifier,
14136 each enumerator has the type of its enumeration. Prior to the
14137 closing brace, the type of each enumerator is the type of its
14138 initializing value. */
14139 TREE_TYPE (decl
) = enumtype
;
14141 /* Update the minimum and maximum values, if appropriate. */
14142 value
= DECL_INITIAL (decl
);
14143 if (value
== error_mark_node
)
14144 value
= integer_zero_node
;
14145 /* Figure out what the minimum and maximum values of the
14146 enumerators are. */
14148 minnode
= maxnode
= value
;
14149 else if (tree_int_cst_lt (maxnode
, value
))
14151 else if (tree_int_cst_lt (value
, minnode
))
14158 If the enumerator-list is empty, the underlying type is as if
14159 the enumeration had a single enumerator with value 0. */
14160 minnode
= maxnode
= integer_zero_node
;
14162 if (!fixed_underlying_type_p
)
14164 /* Compute the number of bits require to represent all values of the
14165 enumeration. We must do this before the type of MINNODE and
14166 MAXNODE are transformed, since tree_int_cst_min_precision relies
14167 on the TREE_TYPE of the value it is passed. */
14168 signop sgn
= tree_int_cst_sgn (minnode
) >= 0 ? UNSIGNED
: SIGNED
;
14169 int lowprec
= tree_int_cst_min_precision (minnode
, sgn
);
14170 int highprec
= tree_int_cst_min_precision (maxnode
, sgn
);
14171 int precision
= MAX (lowprec
, highprec
);
14173 bool use_short_enum
;
14175 /* Determine the underlying type of the enumeration.
14179 The underlying type of an enumeration is an integral type that
14180 can represent all the enumerator values defined in the
14181 enumeration. It is implementation-defined which integral type is
14182 used as the underlying type for an enumeration except that the
14183 underlying type shall not be larger than int unless the value of
14184 an enumerator cannot fit in an int or unsigned int.
14186 We use "int" or an "unsigned int" as the underlying type, even if
14187 a smaller integral type would work, unless the user has
14188 explicitly requested that we use the smallest possible type. The
14189 user can request that for all enumerations with a command line
14190 flag, or for just one enumeration with an attribute. */
14192 use_short_enum
= flag_short_enums
14193 || lookup_attribute ("packed", TYPE_ATTRIBUTES (enumtype
));
14195 /* If the precision of the type was specified with an attribute and it
14196 was too small, give an error. Otherwise, use it. */
14197 if (TYPE_PRECISION (enumtype
))
14199 if (precision
> TYPE_PRECISION (enumtype
))
14200 error ("specified mode too small for enumeral values");
14203 use_short_enum
= true;
14204 precision
= TYPE_PRECISION (enumtype
);
14208 for (itk
= (use_short_enum
? itk_char
: itk_int
);
14212 underlying_type
= integer_types
[itk
];
14213 if (underlying_type
!= NULL_TREE
14214 && TYPE_PRECISION (underlying_type
) >= precision
14215 && TYPE_SIGN (underlying_type
) == sgn
)
14218 if (itk
== itk_none
)
14222 IF no integral type can represent all the enumerator values, the
14223 enumeration is ill-formed. */
14224 error ("no integral type can represent all of the enumerator values "
14225 "for %qT", enumtype
);
14226 precision
= TYPE_PRECISION (long_long_integer_type_node
);
14227 underlying_type
= integer_types
[itk_unsigned_long_long
];
14232 The value of sizeof() applied to an enumeration type, an object
14233 of an enumeration type, or an enumerator, is the value of sizeof()
14234 applied to the underlying type. */
14235 copy_type_enum (enumtype
, underlying_type
);
14237 /* Compute the minimum and maximum values for the type.
14241 For an enumeration where emin is the smallest enumerator and emax
14242 is the largest, the values of the enumeration are the values of the
14243 underlying type in the range bmin to bmax, where bmin and bmax are,
14244 respectively, the smallest and largest values of the smallest bit-
14245 field that can store emin and emax. */
14247 /* The middle-end currently assumes that types with TYPE_PRECISION
14248 narrower than their underlying type are suitably zero or sign
14249 extended to fill their mode. Similarly, it assumes that the front
14250 end assures that a value of a particular type must be within
14251 TYPE_MIN_VALUE and TYPE_MAX_VALUE.
14253 We used to set these fields based on bmin and bmax, but that led
14254 to invalid assumptions like optimizing away bounds checking. So
14255 now we just set the TYPE_PRECISION, TYPE_MIN_VALUE, and
14256 TYPE_MAX_VALUE to the values for the mode above and only restrict
14257 the ENUM_UNDERLYING_TYPE for the benefit of diagnostics. */
14258 ENUM_UNDERLYING_TYPE (enumtype
)
14259 = build_distinct_type_copy (underlying_type
);
14260 TYPE_PRECISION (ENUM_UNDERLYING_TYPE (enumtype
)) = precision
;
14261 set_min_and_max_values_for_integral_type
14262 (ENUM_UNDERLYING_TYPE (enumtype
), precision
, sgn
);
14264 /* If -fstrict-enums, still constrain TYPE_MIN/MAX_VALUE. */
14265 if (flag_strict_enums
)
14266 set_min_and_max_values_for_integral_type (enumtype
, precision
, sgn
);
14269 underlying_type
= ENUM_UNDERLYING_TYPE (enumtype
);
14271 /* Convert each of the enumerators to the type of the underlying
14272 type of the enumeration. */
14273 for (values
= TYPE_VALUES (enumtype
); values
; values
= TREE_CHAIN (values
))
14275 location_t saved_location
;
14277 decl
= TREE_VALUE (values
);
14278 saved_location
= input_location
;
14279 input_location
= DECL_SOURCE_LOCATION (decl
);
14280 if (fixed_underlying_type_p
)
14281 /* If the enumeration type has a fixed underlying type, we
14282 already checked all of the enumerator values. */
14283 value
= DECL_INITIAL (decl
);
14285 value
= perform_implicit_conversion (underlying_type
,
14286 DECL_INITIAL (decl
),
14287 tf_warning_or_error
);
14288 input_location
= saved_location
;
14290 /* Do not clobber shared ints. */
14291 if (value
!= error_mark_node
)
14293 value
= copy_node (value
);
14295 TREE_TYPE (value
) = enumtype
;
14297 DECL_INITIAL (decl
) = value
;
14300 /* Fix up all variant types of this enum type. */
14301 for (t
= TYPE_MAIN_VARIANT (enumtype
); t
; t
= TYPE_NEXT_VARIANT (t
))
14302 TYPE_VALUES (t
) = TYPE_VALUES (enumtype
);
14304 if (at_class_scope_p ()
14305 && COMPLETE_TYPE_P (current_class_type
)
14306 && UNSCOPED_ENUM_P (enumtype
))
14308 insert_late_enum_def_bindings (current_class_type
, enumtype
);
14309 /* TYPE_FIELDS needs fixup. */
14310 fixup_type_variants (current_class_type
);
14313 /* Finish debugging output for this type. */
14314 rest_of_type_compilation (enumtype
, namespace_bindings_p ());
14316 /* Each enumerator now has the type of its enumeration. Clear the cache
14317 so that this change in types doesn't confuse us later on. */
14318 clear_cv_and_fold_caches ();
14321 /* Finishes the enum type. This is called only the first time an
14322 enumeration is seen, be it opaque or odinary.
14323 ENUMTYPE is the type object. */
14326 finish_enum (tree enumtype
)
14328 if (processing_template_decl
)
14330 if (at_function_scope_p ())
14331 add_stmt (build_min (TAG_DEFN
, enumtype
));
14335 /* If this is a forward declaration, there should not be any variants,
14336 though we can get a variant in the middle of an enum-specifier with
14337 wacky code like 'enum E { e = sizeof(const E*) };' */
14338 gcc_assert (enumtype
== TYPE_MAIN_VARIANT (enumtype
)
14339 && (TYPE_VALUES (enumtype
)
14340 || !TYPE_NEXT_VARIANT (enumtype
)));
14343 /* Build and install a CONST_DECL for an enumeration constant of the
14344 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
14345 Apply ATTRIBUTES if available. LOC is the location of NAME.
14346 Assignment of sequential values by default is handled here. */
14349 build_enumerator (tree name
, tree value
, tree enumtype
, tree attributes
,
14356 /* scalar_constant_value will pull out this expression, so make sure
14357 it's folded as appropriate. */
14358 if (processing_template_decl
)
14359 value
= fold_non_dependent_expr (value
);
14361 /* If the VALUE was erroneous, pretend it wasn't there; that will
14362 result in the enum being assigned the next value in sequence. */
14363 if (value
== error_mark_node
)
14366 /* Remove no-op casts from the value. */
14368 STRIP_TYPE_NOPS (value
);
14370 if (! processing_template_decl
)
14372 /* Validate and default VALUE. */
14373 if (value
!= NULL_TREE
)
14375 if (!ENUM_UNDERLYING_TYPE (enumtype
))
14377 tree tmp_value
= build_expr_type_conversion (WANT_INT
| WANT_ENUM
,
14382 else if (! INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P
14383 (TREE_TYPE (value
)))
14384 value
= perform_implicit_conversion_flags
14385 (ENUM_UNDERLYING_TYPE (enumtype
), value
, tf_warning_or_error
,
14386 LOOKUP_IMPLICIT
| LOOKUP_NO_NARROWING
);
14388 if (value
== error_mark_node
)
14391 if (value
!= NULL_TREE
)
14393 if (! INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P
14394 (TREE_TYPE (value
)))
14396 error ("enumerator value for %qD must have integral or "
14397 "unscoped enumeration type", name
);
14402 value
= cxx_constant_value (value
);
14404 if (TREE_CODE (value
) != INTEGER_CST
)
14406 error ("enumerator value for %qD is not an integer "
14414 /* Default based on previous value. */
14415 if (value
== NULL_TREE
)
14417 if (TYPE_VALUES (enumtype
))
14422 /* C++03 7.2/4: If no initializer is specified for the first
14423 enumerator, the type is an unspecified integral
14424 type. Otherwise the type is the same as the type of the
14425 initializing value of the preceding enumerator unless the
14426 incremented value is not representable in that type, in
14427 which case the type is an unspecified integral type
14428 sufficient to contain the incremented value. */
14429 prev_value
= DECL_INITIAL (TREE_VALUE (TYPE_VALUES (enumtype
)));
14430 if (error_operand_p (prev_value
))
14431 value
= error_mark_node
;
14434 tree type
= TREE_TYPE (prev_value
);
14435 signop sgn
= TYPE_SIGN (type
);
14436 widest_int wi
= wi::add (wi::to_widest (prev_value
), 1, sgn
,
14440 bool pos
= !wi::neg_p (wi
, sgn
);
14441 if (!wi::fits_to_tree_p (wi
, type
))
14444 for (itk
= itk_int
; itk
!= itk_none
; itk
++)
14446 type
= integer_types
[itk
];
14447 if (type
!= NULL_TREE
14448 && (pos
|| !TYPE_UNSIGNED (type
))
14449 && wi::fits_to_tree_p (wi
, type
))
14452 if (type
&& cxx_dialect
< cxx11
14453 && itk
> itk_unsigned_long
)
14454 pedwarn (input_location
, OPT_Wlong_long
,
14456 incremented enumerator value is too large for %<unsigned long%>") : G_("\
14457 incremented enumerator value is too large for %<long%>"));
14459 if (type
== NULL_TREE
)
14462 value
= wide_int_to_tree (type
, wi
);
14467 error ("overflow in enumeration values at %qD", name
);
14468 value
= error_mark_node
;
14473 value
= integer_zero_node
;
14476 /* Remove no-op casts from the value. */
14477 STRIP_TYPE_NOPS (value
);
14479 /* If the underlying type of the enum is fixed, check whether
14480 the enumerator values fits in the underlying type. If it
14481 does not fit, the program is ill-formed [C++0x dcl.enum]. */
14482 if (ENUM_UNDERLYING_TYPE (enumtype
)
14484 && TREE_CODE (value
) == INTEGER_CST
)
14486 if (!int_fits_type_p (value
, ENUM_UNDERLYING_TYPE (enumtype
)))
14487 error ("enumerator value %qE is outside the range of underlying "
14488 "type %qT", value
, ENUM_UNDERLYING_TYPE (enumtype
));
14490 /* Convert the value to the appropriate type. */
14491 value
= fold_convert (ENUM_UNDERLYING_TYPE (enumtype
), value
);
14495 /* C++ associates enums with global, function, or class declarations. */
14496 context
= current_scope ();
14498 /* Build the actual enumeration constant. Note that the enumeration
14499 constants have the underlying type of the enum (if it is fixed)
14500 or the type of their initializer (if the underlying type of the
14501 enum is not fixed):
14505 If the underlying type is fixed, the type of each enumerator
14506 prior to the closing brace is the underlying type; if the
14507 initializing value of an enumerator cannot be represented by
14508 the underlying type, the program is ill-formed. If the
14509 underlying type is not fixed, the type of each enumerator is
14510 the type of its initializing value.
14512 If the underlying type is not fixed, it will be computed by
14513 finish_enum and we will reset the type of this enumerator. Of
14514 course, if we're processing a template, there may be no value. */
14515 type
= value
? TREE_TYPE (value
) : NULL_TREE
;
14517 decl
= build_decl (loc
, CONST_DECL
, name
, type
);
14519 DECL_CONTEXT (decl
) = enumtype
;
14520 TREE_CONSTANT (decl
) = 1;
14521 TREE_READONLY (decl
) = 1;
14522 DECL_INITIAL (decl
) = value
;
14525 cplus_decl_attributes (&decl
, attributes
, 0);
14527 if (context
&& context
== current_class_type
&& !SCOPED_ENUM_P (enumtype
))
14529 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
14530 on the TYPE_FIELDS list for `S'. (That's so that you can say
14531 things like `S::i' later.) */
14533 /* The enumerator may be getting declared outside of its enclosing
14536 class S { public: enum E : int; }; enum S::E : int { i = 7; };
14538 For which case we need to make sure that the access of `S::i'
14539 matches the access of `S::E'. */
14540 tree saved_cas
= current_access_specifier
;
14541 if (TREE_PRIVATE (TYPE_NAME (enumtype
)))
14542 current_access_specifier
= access_private_node
;
14543 else if (TREE_PROTECTED (TYPE_NAME (enumtype
)))
14544 current_access_specifier
= access_protected_node
;
14546 current_access_specifier
= access_public_node
;
14548 finish_member_declaration (decl
);
14550 current_access_specifier
= saved_cas
;
14555 /* Add this enumeration constant to the list for this type. */
14556 TYPE_VALUES (enumtype
) = tree_cons (name
, decl
, TYPE_VALUES (enumtype
));
14559 /* Look for an enumerator with the given NAME within the enumeration
14560 type ENUMTYPE. This routine is used primarily for qualified name
14561 lookup into an enumerator in C++0x, e.g.,
14563 enum class Color { Red, Green, Blue };
14565 Color color = Color::Red;
14567 Returns the value corresponding to the enumerator, or
14568 NULL_TREE if no such enumerator was found. */
14570 lookup_enumerator (tree enumtype
, tree name
)
14573 gcc_assert (enumtype
&& TREE_CODE (enumtype
) == ENUMERAL_TYPE
);
14575 e
= purpose_member (name
, TYPE_VALUES (enumtype
));
14576 return e
? TREE_VALUE (e
) : NULL_TREE
;
14580 /* We're defining DECL. Make sure that its type is OK. */
14583 check_function_type (tree decl
, tree current_function_parms
)
14585 tree fntype
= TREE_TYPE (decl
);
14586 tree return_type
= complete_type (TREE_TYPE (fntype
));
14588 /* In a function definition, arg types must be complete. */
14589 require_complete_types_for_parms (current_function_parms
);
14591 if (dependent_type_p (return_type
)
14592 || type_uses_auto (return_type
))
14594 if (!COMPLETE_OR_VOID_TYPE_P (return_type
))
14596 tree args
= TYPE_ARG_TYPES (fntype
);
14598 error ("return type %q#T is incomplete", return_type
);
14600 /* Make it return void instead. */
14601 if (TREE_CODE (fntype
) == METHOD_TYPE
)
14602 fntype
= build_method_type_directly (TREE_TYPE (TREE_VALUE (args
)),
14604 TREE_CHAIN (args
));
14606 fntype
= build_function_type (void_type_node
, args
);
14608 = build_exception_variant (fntype
,
14609 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (decl
)));
14610 fntype
= (cp_build_type_attribute_variant
14611 (fntype
, TYPE_ATTRIBUTES (TREE_TYPE (decl
))));
14612 TREE_TYPE (decl
) = fntype
;
14616 abstract_virtuals_error (decl
, TREE_TYPE (fntype
));
14617 maybe_warn_parm_abi (TREE_TYPE (fntype
),
14618 DECL_SOURCE_LOCATION (decl
));
14622 /* True iff FN is an implicitly-defined default constructor. */
14625 implicit_default_ctor_p (tree fn
)
14627 return (DECL_CONSTRUCTOR_P (fn
)
14628 && !user_provided_p (fn
)
14629 && sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (fn
)));
14632 /* Clobber the contents of *this to let the back end know that the object
14633 storage is dead when we enter the constructor or leave the destructor. */
14636 build_clobber_this ()
14638 /* Clobbering an empty base is pointless, and harmful if its one byte
14639 TYPE_SIZE overlays real data. */
14640 if (is_empty_class (current_class_type
))
14643 /* If we have virtual bases, clobber the whole object, but only if we're in
14644 charge. If we don't have virtual bases, clobber the as-base type so we
14645 don't mess with tail padding. */
14646 bool vbases
= CLASSTYPE_VBASECLASSES (current_class_type
);
14648 tree ctype
= current_class_type
;
14650 ctype
= CLASSTYPE_AS_BASE (ctype
);
14652 tree clobber
= build_constructor (ctype
, NULL
);
14653 TREE_THIS_VOLATILE (clobber
) = true;
14655 tree thisref
= current_class_ref
;
14656 if (ctype
!= current_class_type
)
14658 thisref
= build_nop (build_reference_type (ctype
), current_class_ptr
);
14659 thisref
= convert_from_reference (thisref
);
14662 tree exprstmt
= build2 (MODIFY_EXPR
, void_type_node
, thisref
, clobber
);
14664 exprstmt
= build_if_in_charge (exprstmt
);
14669 /* Create the FUNCTION_DECL for a function definition.
14670 DECLSPECS and DECLARATOR are the parts of the declaration;
14671 they describe the function's name and the type it returns,
14672 but twisted together in a fashion that parallels the syntax of C.
14674 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
14675 DECLARATOR is really the DECL for the function we are about to
14676 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
14677 indicating that the function is an inline defined in-class.
14679 This function creates a binding context for the function body
14680 as well as setting up the FUNCTION_DECL in current_function_decl.
14682 For C++, we must first check whether that datum makes any sense.
14683 For example, "class A local_a(1,2);" means that variable local_a
14684 is an aggregate of type A, which should have a constructor
14685 applied to it with the argument list [1, 2].
14687 On entry, DECL_INITIAL (decl1) should be NULL_TREE or error_mark_node,
14688 or may be a BLOCK if the function has been defined previously
14689 in this translation unit. On exit, DECL_INITIAL (decl1) will be
14690 error_mark_node if the function has never been defined, or
14691 a BLOCK if the function has been defined somewhere. */
14694 start_preparsed_function (tree decl1
, tree attrs
, int flags
)
14696 tree ctype
= NULL_TREE
;
14699 int doing_friend
= 0;
14700 cp_binding_level
*bl
;
14701 tree current_function_parms
;
14702 struct c_fileinfo
*finfo
14703 = get_fileinfo (LOCATION_FILE (DECL_SOURCE_LOCATION (decl1
)));
14704 bool honor_interface
;
14706 /* Sanity check. */
14707 gcc_assert (VOID_TYPE_P (TREE_VALUE (void_list_node
)));
14708 gcc_assert (TREE_CHAIN (void_list_node
) == NULL_TREE
);
14710 fntype
= TREE_TYPE (decl1
);
14711 if (TREE_CODE (fntype
) == METHOD_TYPE
)
14712 ctype
= TYPE_METHOD_BASETYPE (fntype
);
14714 /* ISO C++ 11.4/5. A friend function defined in a class is in
14715 the (lexical) scope of the class in which it is defined. */
14716 if (!ctype
&& DECL_FRIEND_P (decl1
))
14718 ctype
= DECL_FRIEND_CONTEXT (decl1
);
14720 /* CTYPE could be null here if we're dealing with a template;
14721 for example, `inline friend float foo()' inside a template
14722 will have no CTYPE set. */
14723 if (ctype
&& TREE_CODE (ctype
) != RECORD_TYPE
)
14729 if (DECL_DECLARED_INLINE_P (decl1
)
14730 && lookup_attribute ("noinline", attrs
))
14731 warning_at (DECL_SOURCE_LOCATION (decl1
), 0,
14732 "inline function %qD given attribute noinline", decl1
);
14734 /* Handle gnu_inline attribute. */
14735 if (GNU_INLINE_P (decl1
))
14737 DECL_EXTERNAL (decl1
) = 1;
14738 DECL_NOT_REALLY_EXTERN (decl1
) = 0;
14739 DECL_INTERFACE_KNOWN (decl1
) = 1;
14740 DECL_DISREGARD_INLINE_LIMITS (decl1
) = 1;
14743 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl1
))
14744 /* This is a constructor, we must ensure that any default args
14745 introduced by this definition are propagated to the clones
14746 now. The clones are used directly in overload resolution. */
14747 adjust_clone_args (decl1
);
14749 /* Sometimes we don't notice that a function is a static member, and
14750 build a METHOD_TYPE for it. Fix that up now. */
14751 gcc_assert (!(ctype
!= NULL_TREE
&& DECL_STATIC_FUNCTION_P (decl1
)
14752 && TREE_CODE (TREE_TYPE (decl1
)) == METHOD_TYPE
));
14754 /* Set up current_class_type, and enter the scope of the class, if
14757 push_nested_class (ctype
);
14758 else if (DECL_STATIC_FUNCTION_P (decl1
))
14759 push_nested_class (DECL_CONTEXT (decl1
));
14761 /* Now that we have entered the scope of the class, we must restore
14762 the bindings for any template parameters surrounding DECL1, if it
14763 is an inline member template. (Order is important; consider the
14764 case where a template parameter has the same name as a field of
14765 the class.) It is not until after this point that
14766 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
14767 if (flags
& SF_INCLASS_INLINE
)
14768 maybe_begin_member_template_processing (decl1
);
14770 /* Effective C++ rule 15. */
14772 && DECL_OVERLOADED_OPERATOR_P (decl1
) == NOP_EXPR
14773 && VOID_TYPE_P (TREE_TYPE (fntype
)))
14774 warning (OPT_Weffc__
, "%<operator=%> should return a reference to %<*this%>");
14776 /* Make the init_value nonzero so pushdecl knows this is not tentative.
14777 error_mark_node is replaced below (in poplevel) with the BLOCK. */
14778 if (!DECL_INITIAL (decl1
))
14779 DECL_INITIAL (decl1
) = error_mark_node
;
14781 /* This function exists in static storage.
14782 (This does not mean `static' in the C sense!) */
14783 TREE_STATIC (decl1
) = 1;
14785 /* We must call push_template_decl after current_class_type is set
14786 up. (If we are processing inline definitions after exiting a
14787 class scope, current_class_type will be NULL_TREE until set above
14788 by push_nested_class.) */
14789 if (processing_template_decl
)
14791 tree newdecl1
= push_template_decl (decl1
);
14792 if (newdecl1
== error_mark_node
)
14794 if (ctype
|| DECL_STATIC_FUNCTION_P (decl1
))
14795 pop_nested_class ();
14801 /* Make sure the parameter and return types are reasonable. When
14802 you declare a function, these types can be incomplete, but they
14803 must be complete when you define the function. */
14804 check_function_type (decl1
, DECL_ARGUMENTS (decl1
));
14806 /* Build the return declaration for the function. */
14807 restype
= TREE_TYPE (fntype
);
14809 if (DECL_RESULT (decl1
) == NULL_TREE
)
14813 resdecl
= build_decl (input_location
, RESULT_DECL
, 0, restype
);
14814 DECL_ARTIFICIAL (resdecl
) = 1;
14815 DECL_IGNORED_P (resdecl
) = 1;
14816 DECL_RESULT (decl1
) = resdecl
;
14818 cp_apply_type_quals_to_decl (cp_type_quals (restype
), resdecl
);
14821 /* Record the decl so that the function name is defined.
14822 If we already have a decl for this name, and it is a FUNCTION_DECL,
14823 use the old decl. */
14824 if (!processing_template_decl
&& !(flags
& SF_PRE_PARSED
))
14826 /* A specialization is not used to guide overload resolution. */
14827 if (!DECL_FUNCTION_MEMBER_P (decl1
)
14828 && !(DECL_USE_TEMPLATE (decl1
) &&
14829 PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl1
))))
14831 tree olddecl
= pushdecl (decl1
);
14833 if (olddecl
== error_mark_node
)
14834 /* If something went wrong when registering the declaration,
14835 use DECL1; we have to have a FUNCTION_DECL to use when
14836 parsing the body of the function. */
14840 /* Otherwise, OLDDECL is either a previous declaration
14841 of the same function or DECL1 itself. */
14843 if (warn_missing_declarations
14844 && olddecl
== decl1
14845 && !DECL_MAIN_P (decl1
)
14846 && TREE_PUBLIC (decl1
)
14847 && !DECL_DECLARED_INLINE_P (decl1
))
14851 /* Check whether DECL1 is in an anonymous
14853 for (context
= DECL_CONTEXT (decl1
);
14855 context
= DECL_CONTEXT (context
))
14857 if (TREE_CODE (context
) == NAMESPACE_DECL
14858 && DECL_NAME (context
) == NULL_TREE
)
14862 if (context
== NULL
)
14863 warning_at (DECL_SOURCE_LOCATION (decl1
),
14864 OPT_Wmissing_declarations
,
14865 "no previous declaration for %qD", decl1
);
14873 /* We need to set the DECL_CONTEXT. */
14874 if (!DECL_CONTEXT (decl1
) && DECL_TEMPLATE_INFO (decl1
))
14875 DECL_CONTEXT (decl1
) = DECL_CONTEXT (DECL_TI_TEMPLATE (decl1
));
14877 fntype
= TREE_TYPE (decl1
);
14878 restype
= TREE_TYPE (fntype
);
14880 /* If #pragma weak applies, mark the decl appropriately now.
14881 The pragma only applies to global functions. Because
14882 determining whether or not the #pragma applies involves
14883 computing the mangled name for the declaration, we cannot
14884 apply the pragma until after we have merged this declaration
14885 with any previous declarations; if the original declaration
14886 has a linkage specification, that specification applies to
14887 the definition as well, and may affect the mangled name. */
14888 if (DECL_FILE_SCOPE_P (decl1
))
14889 maybe_apply_pragma_weak (decl1
);
14892 /* We are now in the scope of the function being defined. */
14893 current_function_decl
= decl1
;
14895 /* Save the parm names or decls from this function's declarator
14896 where store_parm_decls will find them. */
14897 current_function_parms
= DECL_ARGUMENTS (decl1
);
14899 /* Let the user know we're compiling this function. */
14900 announce_function (decl1
);
14902 gcc_assert (DECL_INITIAL (decl1
));
14904 /* This function may already have been parsed, in which case just
14905 return; our caller will skip over the body without parsing. */
14906 if (DECL_INITIAL (decl1
) != error_mark_node
)
14909 /* Initialize RTL machinery. We cannot do this until
14910 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
14911 even when processing a template; this is how we get
14912 CFUN set up, and our per-function variables initialized.
14913 FIXME factor out the non-RTL stuff. */
14914 bl
= current_binding_level
;
14915 allocate_struct_function (decl1
, processing_template_decl
);
14917 /* Initialize the language data structures. Whenever we start
14918 a new function, we destroy temporaries in the usual way. */
14919 cfun
->language
= ggc_cleared_alloc
<language_function
> ();
14920 current_stmt_tree ()->stmts_are_full_exprs_p
= 1;
14921 current_binding_level
= bl
;
14923 if (!processing_template_decl
&& type_uses_auto (restype
))
14925 FNDECL_USED_AUTO (decl1
) = true;
14926 current_function_auto_return_pattern
= restype
;
14929 /* Start the statement-tree, start the tree now. */
14930 DECL_SAVED_TREE (decl1
) = push_stmt_list ();
14932 /* If we are (erroneously) defining a function that we have already
14933 defined before, wipe out what we knew before. */
14934 if (!DECL_PENDING_INLINE_P (decl1
))
14935 DECL_SAVED_FUNCTION_DATA (decl1
) = NULL
;
14937 if (ctype
&& !doing_friend
&& !DECL_STATIC_FUNCTION_P (decl1
))
14939 /* We know that this was set up by `grokclassfn'. We do not
14940 wait until `store_parm_decls', since evil parse errors may
14941 never get us to that point. Here we keep the consistency
14942 between `current_class_type' and `current_class_ptr'. */
14943 tree t
= DECL_ARGUMENTS (decl1
);
14945 gcc_assert (t
!= NULL_TREE
&& TREE_CODE (t
) == PARM_DECL
);
14946 gcc_assert (TYPE_PTR_P (TREE_TYPE (t
)));
14948 cp_function_chain
->x_current_class_ref
14949 = cp_build_indirect_ref (t
, RO_NULL
, tf_warning_or_error
);
14950 /* Set this second to avoid shortcut in cp_build_indirect_ref. */
14951 cp_function_chain
->x_current_class_ptr
= t
;
14953 /* Constructors and destructors need to know whether they're "in
14954 charge" of initializing virtual base classes. */
14955 t
= DECL_CHAIN (t
);
14956 if (DECL_HAS_IN_CHARGE_PARM_P (decl1
))
14958 current_in_charge_parm
= t
;
14959 t
= DECL_CHAIN (t
);
14961 if (DECL_HAS_VTT_PARM_P (decl1
))
14963 gcc_assert (DECL_NAME (t
) == vtt_parm_identifier
);
14964 current_vtt_parm
= t
;
14968 honor_interface
= (!DECL_TEMPLATE_INSTANTIATION (decl1
)
14969 /* Implicitly-defined methods (like the
14970 destructor for a class in which no destructor
14971 is explicitly declared) must not be defined
14972 until their definition is needed. So, we
14973 ignore interface specifications for
14974 compiler-generated functions. */
14975 && !DECL_ARTIFICIAL (decl1
));
14977 if (processing_template_decl
)
14978 /* Don't mess with interface flags. */;
14979 else if (DECL_INTERFACE_KNOWN (decl1
))
14981 tree ctx
= decl_function_context (decl1
);
14983 if (DECL_NOT_REALLY_EXTERN (decl1
))
14984 DECL_EXTERNAL (decl1
) = 0;
14986 if (ctx
!= NULL_TREE
&& vague_linkage_p (ctx
))
14987 /* This is a function in a local class in an extern inline
14988 or template function. */
14989 comdat_linkage (decl1
);
14991 /* If this function belongs to an interface, it is public.
14992 If it belongs to someone else's interface, it is also external.
14993 This only affects inlines and template instantiations. */
14994 else if (!finfo
->interface_unknown
&& honor_interface
)
14996 if (DECL_DECLARED_INLINE_P (decl1
)
14997 || DECL_TEMPLATE_INSTANTIATION (decl1
))
14999 DECL_EXTERNAL (decl1
)
15000 = (finfo
->interface_only
15001 || (DECL_DECLARED_INLINE_P (decl1
)
15002 && ! flag_implement_inlines
15003 && !DECL_VINDEX (decl1
)));
15005 /* For WIN32 we also want to put these in linkonce sections. */
15006 maybe_make_one_only (decl1
);
15009 DECL_EXTERNAL (decl1
) = 0;
15010 DECL_INTERFACE_KNOWN (decl1
) = 1;
15011 /* If this function is in an interface implemented in this file,
15012 make sure that the back end knows to emit this function
15014 if (!DECL_EXTERNAL (decl1
))
15015 mark_needed (decl1
);
15017 else if (finfo
->interface_unknown
&& finfo
->interface_only
15018 && honor_interface
)
15020 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
15021 interface, we will have both finfo->interface_unknown and
15022 finfo->interface_only set. In that case, we don't want to
15023 use the normal heuristics because someone will supply a
15024 #pragma implementation elsewhere, and deducing it here would
15025 produce a conflict. */
15026 comdat_linkage (decl1
);
15027 DECL_EXTERNAL (decl1
) = 0;
15028 DECL_INTERFACE_KNOWN (decl1
) = 1;
15029 DECL_DEFER_OUTPUT (decl1
) = 1;
15033 /* This is a definition, not a reference.
15034 So clear DECL_EXTERNAL, unless this is a GNU extern inline. */
15035 if (!GNU_INLINE_P (decl1
))
15036 DECL_EXTERNAL (decl1
) = 0;
15038 if ((DECL_DECLARED_INLINE_P (decl1
)
15039 || DECL_TEMPLATE_INSTANTIATION (decl1
))
15040 && ! DECL_INTERFACE_KNOWN (decl1
))
15041 DECL_DEFER_OUTPUT (decl1
) = 1;
15043 DECL_INTERFACE_KNOWN (decl1
) = 1;
15046 /* Determine the ELF visibility attribute for the function. We must not
15047 do this before calling "pushdecl", as we must allow "duplicate_decls"
15048 to merge any attributes appropriately. We also need to wait until
15050 if (!DECL_CLONED_FUNCTION_P (decl1
))
15051 determine_visibility (decl1
);
15053 if (!processing_template_decl
)
15054 maybe_instantiate_noexcept (decl1
);
15056 begin_scope (sk_function_parms
, decl1
);
15060 if (DECL_DESTRUCTOR_P (decl1
)
15061 || (DECL_CONSTRUCTOR_P (decl1
)
15062 && targetm
.cxx
.cdtor_returns_this ()))
15064 cdtor_label
= create_artificial_label (input_location
);
15065 LABEL_DECL_CDTOR (cdtor_label
) = true;
15068 start_fname_decls ();
15070 store_parm_decls (current_function_parms
);
15072 if (!processing_template_decl
15073 && (flag_lifetime_dse
> 1)
15074 && DECL_CONSTRUCTOR_P (decl1
)
15075 && !DECL_CLONED_FUNCTION_P (decl1
)
15076 /* Clobbering an empty base is harmful if it overlays real data. */
15077 && !is_empty_class (current_class_type
)
15078 /* We can't clobber safely for an implicitly-defined default constructor
15079 because part of the initialization might happen before we enter the
15080 constructor, via AGGR_INIT_ZERO_FIRST (c++/68006). */
15081 && !implicit_default_ctor_p (decl1
))
15082 finish_expr_stmt (build_clobber_this ());
15084 if (!processing_template_decl
15085 && DECL_CONSTRUCTOR_P (decl1
)
15086 && sanitize_flags_p (SANITIZE_VPTR
)
15087 && !DECL_CLONED_FUNCTION_P (decl1
)
15088 && !implicit_default_ctor_p (decl1
))
15089 cp_ubsan_maybe_initialize_vtbl_ptrs (current_class_ptr
);
15091 start_lambda_scope (decl1
);
15097 /* Like start_preparsed_function, except that instead of a
15098 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
15100 Returns true on success. If the DECLARATOR is not suitable
15101 for a function, we return false, which tells the parser to
15102 skip the entire function. */
15105 start_function (cp_decl_specifier_seq
*declspecs
,
15106 const cp_declarator
*declarator
,
15111 decl1
= grokdeclarator (declarator
, declspecs
, FUNCDEF
, 1, &attrs
);
15112 invoke_plugin_callbacks (PLUGIN_START_PARSE_FUNCTION
, decl1
);
15113 if (decl1
== error_mark_node
)
15115 /* If the declarator is not suitable for a function definition,
15116 cause a syntax error. */
15117 if (decl1
== NULL_TREE
|| TREE_CODE (decl1
) != FUNCTION_DECL
)
15119 error ("invalid function declaration");
15123 if (DECL_MAIN_P (decl1
))
15124 /* main must return int. grokfndecl should have corrected it
15125 (and issued a diagnostic) if the user got it wrong. */
15126 gcc_assert (same_type_p (TREE_TYPE (TREE_TYPE (decl1
)),
15127 integer_type_node
));
15129 return start_preparsed_function (decl1
, attrs
, /*flags=*/SF_DEFAULT
);
15132 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
15136 use_eh_spec_block (tree fn
)
15138 return (flag_exceptions
&& flag_enforce_eh_specs
15139 && !processing_template_decl
15140 && !type_throw_all_p (TREE_TYPE (fn
))
15141 /* We insert the EH_SPEC_BLOCK only in the original
15142 function; then, it is copied automatically to the
15144 && !DECL_CLONED_FUNCTION_P (fn
)
15145 /* Implicitly-generated constructors and destructors have
15146 exception specifications. However, those specifications
15147 are the union of the possible exceptions specified by the
15148 constructors/destructors for bases and members, so no
15149 unallowed exception will ever reach this function. By
15150 not creating the EH_SPEC_BLOCK we save a little memory,
15151 and we avoid spurious warnings about unreachable
15153 && !DECL_DEFAULTED_FN (fn
));
15156 /* Store the parameter declarations into the current function declaration.
15157 This is called after parsing the parameter declarations, before
15158 digesting the body of the function.
15160 Also install to binding contour return value identifier, if any. */
15163 store_parm_decls (tree current_function_parms
)
15165 tree fndecl
= current_function_decl
;
15168 /* This is a chain of any other decls that came in among the parm
15169 declarations. If a parm is declared with enum {foo, bar} x;
15170 then CONST_DECLs for foo and bar are put here. */
15171 tree nonparms
= NULL_TREE
;
15173 if (current_function_parms
)
15175 /* This case is when the function was defined with an ANSI prototype.
15176 The parms already have decls, so we need not do anything here
15177 except record them as in effect
15178 and complain if any redundant old-style parm decls were written. */
15180 tree specparms
= current_function_parms
;
15183 /* Must clear this because it might contain TYPE_DECLs declared
15185 current_binding_level
->names
= NULL
;
15187 /* If we're doing semantic analysis, then we'll call pushdecl
15188 for each of these. We must do them in reverse order so that
15189 they end in the correct forward order. */
15190 specparms
= nreverse (specparms
);
15192 for (parm
= specparms
; parm
; parm
= next
)
15194 next
= DECL_CHAIN (parm
);
15195 if (TREE_CODE (parm
) == PARM_DECL
)
15199 /* If we find an enum constant or a type tag,
15200 put it aside for the moment. */
15201 TREE_CHAIN (parm
) = NULL_TREE
;
15202 nonparms
= chainon (nonparms
, parm
);
15206 /* Get the decls in their original chain order and record in the
15207 function. This is all and only the PARM_DECLs that were
15208 pushed into scope by the loop above. */
15209 DECL_ARGUMENTS (fndecl
) = get_local_decls ();
15212 DECL_ARGUMENTS (fndecl
) = NULL_TREE
;
15214 /* Now store the final chain of decls for the arguments
15215 as the decl-chain of the current lexical scope.
15216 Put the enumerators in as well, at the front so that
15217 DECL_ARGUMENTS is not modified. */
15218 current_binding_level
->names
= chainon (nonparms
, DECL_ARGUMENTS (fndecl
));
15220 if (use_eh_spec_block (current_function_decl
))
15221 current_eh_spec_block
= begin_eh_spec_block ();
15225 /* We have finished doing semantic analysis on DECL, but have not yet
15226 generated RTL for its body. Save away our current state, so that
15227 when we want to generate RTL later we know what to do. */
15230 save_function_data (tree decl
)
15232 struct language_function
*f
;
15234 /* Save the language-specific per-function data so that we can
15235 get it back when we really expand this function. */
15236 gcc_assert (!DECL_PENDING_INLINE_P (decl
));
15239 f
= ggc_alloc
<language_function
> ();
15240 memcpy (f
, cp_function_chain
, sizeof (struct language_function
));
15241 DECL_SAVED_FUNCTION_DATA (decl
) = f
;
15243 /* Clear out the bits we don't need. */
15244 f
->base
.x_stmt_tree
.x_cur_stmt_list
= NULL
;
15245 f
->bindings
= NULL
;
15246 f
->x_local_names
= NULL
;
15247 f
->base
.local_typedefs
= NULL
;
15251 /* Set the return value of the constructor (if present). */
15254 finish_constructor_body (void)
15259 if (targetm
.cxx
.cdtor_returns_this ())
15261 /* Any return from a constructor will end up here. */
15262 add_stmt (build_stmt (input_location
, LABEL_EXPR
, cdtor_label
));
15264 val
= DECL_ARGUMENTS (current_function_decl
);
15265 val
= build2 (MODIFY_EXPR
, TREE_TYPE (val
),
15266 DECL_RESULT (current_function_decl
), val
);
15267 /* Return the address of the object. */
15268 exprstmt
= build_stmt (input_location
, RETURN_EXPR
, val
);
15269 add_stmt (exprstmt
);
15273 /* Do all the processing for the beginning of a destructor; set up the
15274 vtable pointers and cleanups for bases and members. */
15277 begin_destructor_body (void)
15279 tree compound_stmt
;
15281 /* If the CURRENT_CLASS_TYPE is incomplete, we will have already
15282 issued an error message. We still want to try to process the
15283 body of the function, but initialize_vtbl_ptrs will crash if
15284 TYPE_BINFO is NULL. */
15285 if (COMPLETE_TYPE_P (current_class_type
))
15287 compound_stmt
= begin_compound_stmt (0);
15288 /* Make all virtual function table pointers in non-virtual base
15289 classes point to CURRENT_CLASS_TYPE's virtual function
15291 initialize_vtbl_ptrs (current_class_ptr
);
15292 finish_compound_stmt (compound_stmt
);
15294 if (flag_lifetime_dse
15295 /* Clobbering an empty base is harmful if it overlays real data. */
15296 && !is_empty_class (current_class_type
))
15297 finish_decl_cleanup (NULL_TREE
, build_clobber_this ());
15299 /* And insert cleanups for our bases and members so that they
15300 will be properly destroyed if we throw. */
15301 push_base_cleanups ();
15305 /* At the end of every destructor we generate code to delete the object if
15306 necessary. Do that now. */
15309 finish_destructor_body (void)
15313 /* Any return from a destructor will end up here; that way all base
15314 and member cleanups will be run when the function returns. */
15315 add_stmt (build_stmt (input_location
, LABEL_EXPR
, cdtor_label
));
15317 if (targetm
.cxx
.cdtor_returns_this ())
15321 val
= DECL_ARGUMENTS (current_function_decl
);
15322 val
= build2 (MODIFY_EXPR
, TREE_TYPE (val
),
15323 DECL_RESULT (current_function_decl
), val
);
15324 /* Return the address of the object. */
15325 exprstmt
= build_stmt (input_location
, RETURN_EXPR
, val
);
15326 add_stmt (exprstmt
);
15330 /* Do the necessary processing for the beginning of a function body, which
15331 in this case includes member-initializers, but not the catch clauses of
15332 a function-try-block. Currently, this means opening a binding level
15333 for the member-initializers (in a ctor), member cleanups (in a dtor),
15334 and capture proxies (in a lambda operator()). */
15337 begin_function_body (void)
15341 if (! FUNCTION_NEEDS_BODY_BLOCK (current_function_decl
))
15344 if (processing_template_decl
)
15345 /* Do nothing now. */;
15347 /* Always keep the BLOCK node associated with the outermost pair of
15348 curly braces of a function. These are needed for correct
15349 operation of dwarfout.c. */
15350 keep_next_level (true);
15352 stmt
= begin_compound_stmt (BCS_FN_BODY
);
15354 if (processing_template_decl
)
15355 /* Do nothing now. */;
15356 else if (DECL_DESTRUCTOR_P (current_function_decl
))
15357 begin_destructor_body ();
15362 /* Do the processing for the end of a function body. Currently, this means
15363 closing out the cleanups for fully-constructed bases and members, and in
15364 the case of the destructor, deleting the object if desired. Again, this
15365 is only meaningful for [cd]tors, since they are the only functions where
15366 there is a significant distinction between the main body and any
15367 function catch clauses. Handling, say, main() return semantics here
15368 would be wrong, as flowing off the end of a function catch clause for
15369 main() would also need to return 0. */
15372 finish_function_body (tree compstmt
)
15374 if (compstmt
== NULL_TREE
)
15377 /* Close the block. */
15378 finish_compound_stmt (compstmt
);
15380 if (processing_template_decl
)
15381 /* Do nothing now. */;
15382 else if (DECL_CONSTRUCTOR_P (current_function_decl
))
15383 finish_constructor_body ();
15384 else if (DECL_DESTRUCTOR_P (current_function_decl
))
15385 finish_destructor_body ();
15388 /* Given a function, returns the BLOCK corresponding to the outermost level
15389 of curly braces, skipping the artificial block created for constructor
15393 outer_curly_brace_block (tree fndecl
)
15395 tree block
= DECL_INITIAL (fndecl
);
15396 if (BLOCK_OUTER_CURLY_BRACE_P (block
))
15398 block
= BLOCK_SUBBLOCKS (block
);
15399 if (BLOCK_OUTER_CURLY_BRACE_P (block
))
15401 block
= BLOCK_SUBBLOCKS (block
);
15402 gcc_assert (BLOCK_OUTER_CURLY_BRACE_P (block
));
15406 /* If FNDECL is a class's key method, add the class to the list of
15407 keyed classes that should be emitted. */
15410 record_key_method_defined (tree fndecl
)
15412 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fndecl
)
15413 && DECL_VIRTUAL_P (fndecl
)
15414 && !processing_template_decl
)
15416 tree fnclass
= DECL_CONTEXT (fndecl
);
15417 if (fndecl
== CLASSTYPE_KEY_METHOD (fnclass
))
15418 vec_safe_push (keyed_classes
, fnclass
);
15422 /* Subroutine of finish_function.
15423 Save the body of constexpr functions for possible
15424 future compile time evaluation. */
15427 maybe_save_function_definition (tree fun
)
15429 if (!processing_template_decl
15430 && DECL_DECLARED_CONSTEXPR_P (fun
)
15431 && !cp_function_chain
->invalid_constexpr
15432 && !DECL_CLONED_FUNCTION_P (fun
))
15433 register_constexpr_fundef (fun
, DECL_SAVED_TREE (fun
));
15436 /* Finish up a function declaration and compile that function
15437 all the way to assembler language output. The free the storage
15438 for the function definition. INLINE_P is TRUE if we just
15439 finished processing the body of an in-class inline function
15440 definition. (This processing will have taken place after the
15441 class definition is complete.) */
15444 finish_function (bool inline_p
)
15446 tree fndecl
= current_function_decl
;
15447 tree fntype
, ctype
= NULL_TREE
;
15449 /* When we get some parse errors, we can end up without a
15450 current_function_decl, so cope. */
15451 if (fndecl
== NULL_TREE
)
15452 return error_mark_node
;
15454 finish_lambda_scope ();
15456 if (c_dialect_objc ())
15457 objc_finish_function ();
15459 record_key_method_defined (fndecl
);
15461 fntype
= TREE_TYPE (fndecl
);
15463 /* TREE_READONLY (fndecl) = 1;
15464 This caused &foo to be of type ptr-to-const-function
15465 which then got a warning when stored in a ptr-to-function variable. */
15467 gcc_assert (building_stmt_list_p ());
15468 /* The current function is being defined, so its DECL_INITIAL should
15469 be set, and unless there's a multiple definition, it should be
15470 error_mark_node. */
15471 gcc_assert (DECL_INITIAL (fndecl
) == error_mark_node
);
15473 /* For a cloned function, we've already got all the code we need;
15474 there's no need to add any extra bits. */
15475 if (!DECL_CLONED_FUNCTION_P (fndecl
))
15477 /* Make it so that `main' always returns 0 by default. */
15478 if (DECL_MAIN_P (current_function_decl
))
15479 finish_return_stmt (integer_zero_node
);
15481 if (use_eh_spec_block (current_function_decl
))
15482 finish_eh_spec_block (TYPE_RAISES_EXCEPTIONS
15483 (TREE_TYPE (current_function_decl
)),
15484 current_eh_spec_block
);
15487 /* If we're saving up tree structure, tie off the function now. */
15488 DECL_SAVED_TREE (fndecl
) = pop_stmt_list (DECL_SAVED_TREE (fndecl
));
15490 if (fn_contains_cilk_spawn_p (cfun
) && !processing_template_decl
)
15491 cfun
->cilk_frame_decl
= insert_cilk_frame (fndecl
);
15493 finish_fname_decls ();
15495 /* If this function can't throw any exceptions, remember that. */
15496 if (!processing_template_decl
15497 && !cp_function_chain
->can_throw
15498 && !flag_non_call_exceptions
15499 && !decl_replaceable_p (fndecl
))
15500 TREE_NOTHROW (fndecl
) = 1;
15502 /* This must come after expand_function_end because cleanups might
15503 have declarations (from inline functions) that need to go into
15504 this function's blocks. */
15506 /* If the current binding level isn't the outermost binding level
15507 for this function, either there is a bug, or we have experienced
15508 syntax errors and the statement tree is malformed. */
15509 if (current_binding_level
->kind
!= sk_function_parms
)
15511 /* Make sure we have already experienced errors. */
15512 gcc_assert (errorcount
);
15514 /* Throw away the broken statement tree and extra binding
15516 DECL_SAVED_TREE (fndecl
) = alloc_stmt_list ();
15518 while (current_binding_level
->kind
!= sk_function_parms
)
15520 if (current_binding_level
->kind
== sk_class
)
15521 pop_nested_class ();
15523 poplevel (0, 0, 0);
15526 poplevel (1, 0, 1);
15528 /* Statements should always be full-expressions at the outermost set
15529 of curly braces for a function. */
15530 gcc_assert (stmts_are_full_exprs_p ());
15532 /* If there are no return statements in a function with auto return type,
15533 the return type is void. But if the declared type is something like
15534 auto*, this is an error. */
15535 if (!processing_template_decl
&& FNDECL_USED_AUTO (fndecl
)
15536 && TREE_TYPE (fntype
) == current_function_auto_return_pattern
)
15538 if (is_auto (current_function_auto_return_pattern
))
15540 apply_deduced_return_type (fndecl
, void_type_node
);
15541 fntype
= TREE_TYPE (fndecl
);
15543 else if (!current_function_returns_value
15544 && !current_function_returns_null
)
15546 error ("no return statements in function returning %qT",
15547 current_function_auto_return_pattern
);
15548 inform (input_location
, "only plain %<auto%> return type can be "
15549 "deduced to %<void%>");
15553 // If this is a concept, check that the definition is reasonable.
15554 if (DECL_DECLARED_CONCEPT_P (fndecl
))
15555 check_function_concept (fndecl
);
15557 /* Lambda closure members are implicitly constexpr if possible. */
15558 if (cxx_dialect
>= cxx17
15559 && LAMBDA_TYPE_P (CP_DECL_CONTEXT (fndecl
)))
15560 DECL_DECLARED_CONSTEXPR_P (fndecl
)
15561 = ((processing_template_decl
15562 || is_valid_constexpr_fn (fndecl
, /*complain*/false))
15563 && potential_constant_expression (DECL_SAVED_TREE (fndecl
)));
15565 /* Save constexpr function body before it gets munged by
15566 the NRV transformation. */
15567 maybe_save_function_definition (fndecl
);
15569 /* Invoke the pre-genericize plugin before we start munging things. */
15570 if (!processing_template_decl
)
15571 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE
, fndecl
);
15573 /* Perform delayed folding before NRV transformation. */
15574 if (!processing_template_decl
)
15575 cp_fold_function (fndecl
);
15577 /* Set up the named return value optimization, if we can. Candidate
15578 variables are selected in check_return_expr. */
15579 if (current_function_return_value
)
15581 tree r
= current_function_return_value
;
15584 if (r
!= error_mark_node
15585 /* This is only worth doing for fns that return in memory--and
15586 simpler, since we don't have to worry about promoted modes. */
15587 && aggregate_value_p (TREE_TYPE (TREE_TYPE (fndecl
)), fndecl
)
15588 /* Only allow this for variables declared in the outer scope of
15589 the function so we know that their lifetime always ends with a
15590 return; see g++.dg/opt/nrv6.C. We could be more flexible if
15591 we were to do this optimization in tree-ssa. */
15592 && (outer
= outer_curly_brace_block (fndecl
))
15593 && chain_member (r
, BLOCK_VARS (outer
)))
15594 finalize_nrv (&DECL_SAVED_TREE (fndecl
), r
, DECL_RESULT (fndecl
));
15596 current_function_return_value
= NULL_TREE
;
15599 /* Remember that we were in class scope. */
15600 if (current_class_name
)
15601 ctype
= current_class_type
;
15603 /* Must mark the RESULT_DECL as being in this function. */
15604 DECL_CONTEXT (DECL_RESULT (fndecl
)) = fndecl
;
15606 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
15607 to the FUNCTION_DECL node itself. */
15608 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl
)) = fndecl
;
15610 /* Save away current state, if appropriate. */
15611 if (!processing_template_decl
)
15612 save_function_data (fndecl
);
15614 /* Complain if there's just no return statement. */
15615 if (warn_return_type
15616 && !VOID_TYPE_P (TREE_TYPE (fntype
))
15617 && !dependent_type_p (TREE_TYPE (fntype
))
15618 && !current_function_returns_value
&& !current_function_returns_null
15619 /* Don't complain if we abort or throw. */
15620 && !current_function_returns_abnormally
15621 /* Don't complain if there's an infinite loop. */
15622 && !current_function_infinite_loop
15623 /* Don't complain if we are declared noreturn. */
15624 && !TREE_THIS_VOLATILE (fndecl
)
15625 && !DECL_NAME (DECL_RESULT (fndecl
))
15626 && !TREE_NO_WARNING (fndecl
)
15627 /* Structor return values (if any) are set by the compiler. */
15628 && !DECL_CONSTRUCTOR_P (fndecl
)
15629 && !DECL_DESTRUCTOR_P (fndecl
)
15630 && targetm
.warn_func_return (fndecl
))
15632 warning (OPT_Wreturn_type
,
15633 "no return statement in function returning non-void");
15634 TREE_NO_WARNING (fndecl
) = 1;
15637 /* Store the end of the function, so that we get good line number
15638 info for the epilogue. */
15639 cfun
->function_end_locus
= input_location
;
15641 /* Complain about parameters that are only set, but never otherwise used. */
15642 if (warn_unused_but_set_parameter
15643 && !processing_template_decl
15644 && errorcount
== unused_but_set_errorcount
15645 && !DECL_CLONED_FUNCTION_P (fndecl
))
15649 for (decl
= DECL_ARGUMENTS (fndecl
);
15651 decl
= DECL_CHAIN (decl
))
15652 if (TREE_USED (decl
)
15653 && TREE_CODE (decl
) == PARM_DECL
15654 && !DECL_READ_P (decl
)
15655 && DECL_NAME (decl
)
15656 && !DECL_ARTIFICIAL (decl
)
15657 && !TREE_NO_WARNING (decl
)
15658 && !DECL_IN_SYSTEM_HEADER (decl
)
15659 && TREE_TYPE (decl
) != error_mark_node
15660 && TREE_CODE (TREE_TYPE (decl
)) != REFERENCE_TYPE
15661 && (!CLASS_TYPE_P (TREE_TYPE (decl
))
15662 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl
))))
15663 warning_at (DECL_SOURCE_LOCATION (decl
),
15664 OPT_Wunused_but_set_parameter
,
15665 "parameter %qD set but not used", decl
);
15666 unused_but_set_errorcount
= errorcount
;
15669 /* Complain about locally defined typedefs that are not used in this
15671 maybe_warn_unused_local_typedefs ();
15673 /* Possibly warn about unused parameters. */
15674 if (warn_unused_parameter
15675 && !processing_template_decl
15676 && !DECL_CLONED_FUNCTION_P (fndecl
))
15677 do_warn_unused_parameter (fndecl
);
15679 /* Genericize before inlining. */
15680 if (!processing_template_decl
)
15682 struct language_function
*f
= DECL_SAVED_FUNCTION_DATA (fndecl
);
15683 cp_genericize (fndecl
);
15684 /* Clear out the bits we don't need. */
15685 f
->x_current_class_ptr
= NULL
;
15686 f
->x_current_class_ref
= NULL
;
15687 f
->x_eh_spec_block
= NULL
;
15688 f
->x_in_charge_parm
= NULL
;
15689 f
->x_vtt_parm
= NULL
;
15690 f
->x_return_value
= NULL
;
15691 f
->bindings
= NULL
;
15692 f
->extern_decl_map
= NULL
;
15693 f
->infinite_loops
= NULL
;
15695 /* Clear out the bits we don't need. */
15696 local_names
= NULL
;
15698 /* We're leaving the context of this function, so zap cfun. It's still in
15699 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
15701 current_function_decl
= NULL
;
15703 /* If this is an in-class inline definition, we may have to pop the
15704 bindings for the template parameters that we added in
15705 maybe_begin_member_template_processing when start_function was
15708 maybe_end_member_template_processing ();
15710 /* Leave the scope of the class. */
15712 pop_nested_class ();
15717 current_function_decl
= NULL_TREE
;
15719 invoke_plugin_callbacks (PLUGIN_FINISH_PARSE_FUNCTION
, fndecl
);
15723 /* Create the FUNCTION_DECL for a function definition.
15724 DECLSPECS and DECLARATOR are the parts of the declaration;
15725 they describe the return type and the name of the function,
15726 but twisted together in a fashion that parallels the syntax of C.
15728 This function creates a binding context for the function body
15729 as well as setting up the FUNCTION_DECL in current_function_decl.
15731 Returns a FUNCTION_DECL on success.
15733 If the DECLARATOR is not suitable for a function (it defines a datum
15734 instead), we return 0, which tells yyparse to report a parse error.
15736 May return void_type_node indicating that this method is actually
15737 a friend. See grokfield for more details.
15739 Came here with a `.pushlevel' .
15741 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
15742 CHANGES TO CODE IN `grokfield'. */
15745 grokmethod (cp_decl_specifier_seq
*declspecs
,
15746 const cp_declarator
*declarator
, tree attrlist
)
15748 tree fndecl
= grokdeclarator (declarator
, declspecs
, MEMFUNCDEF
, 0,
15751 if (fndecl
== error_mark_node
)
15752 return error_mark_node
;
15754 if (fndecl
== NULL
|| TREE_CODE (fndecl
) != FUNCTION_DECL
)
15756 error ("invalid member function declaration");
15757 return error_mark_node
;
15761 cplus_decl_attributes (&fndecl
, attrlist
, 0);
15763 /* Pass friends other than inline friend functions back. */
15764 if (fndecl
== void_type_node
)
15767 if (DECL_IN_AGGR_P (fndecl
))
15769 if (DECL_CLASS_SCOPE_P (fndecl
))
15770 error ("%qD is already defined in class %qT", fndecl
,
15771 DECL_CONTEXT (fndecl
));
15772 return error_mark_node
;
15775 check_template_shadow (fndecl
);
15777 if (TREE_PUBLIC (fndecl
))
15778 DECL_COMDAT (fndecl
) = 1;
15779 DECL_DECLARED_INLINE_P (fndecl
) = 1;
15780 DECL_NO_INLINE_WARNING_P (fndecl
) = 1;
15782 /* We process method specializations in finish_struct_1. */
15783 if (processing_template_decl
&& !DECL_TEMPLATE_SPECIALIZATION (fndecl
))
15785 fndecl
= push_template_decl (fndecl
);
15786 if (fndecl
== error_mark_node
)
15790 if (! DECL_FRIEND_P (fndecl
))
15792 if (DECL_CHAIN (fndecl
))
15794 fndecl
= copy_node (fndecl
);
15795 TREE_CHAIN (fndecl
) = NULL_TREE
;
15799 cp_finish_decl (fndecl
, NULL_TREE
, false, NULL_TREE
, 0);
15801 DECL_IN_AGGR_P (fndecl
) = 1;
15806 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
15807 we can lay it out later, when and if its type becomes complete.
15809 Also handle constexpr variables where the initializer involves
15810 an unlowered PTRMEM_CST because the class isn't complete yet. */
15813 maybe_register_incomplete_var (tree var
)
15815 gcc_assert (VAR_P (var
));
15817 /* Keep track of variables with incomplete types. */
15818 if (!processing_template_decl
&& TREE_TYPE (var
) != error_mark_node
15819 && DECL_EXTERNAL (var
))
15821 tree inner_type
= TREE_TYPE (var
);
15823 while (TREE_CODE (inner_type
) == ARRAY_TYPE
)
15824 inner_type
= TREE_TYPE (inner_type
);
15825 inner_type
= TYPE_MAIN_VARIANT (inner_type
);
15827 if ((!COMPLETE_TYPE_P (inner_type
) && CLASS_TYPE_P (inner_type
))
15828 /* RTTI TD entries are created while defining the type_info. */
15829 || (TYPE_LANG_SPECIFIC (inner_type
)
15830 && TYPE_BEING_DEFINED (inner_type
)))
15832 incomplete_var iv
= {var
, inner_type
};
15833 vec_safe_push (incomplete_vars
, iv
);
15835 else if (!(DECL_LANG_SPECIFIC (var
) && DECL_TEMPLATE_INFO (var
))
15836 && decl_constant_var_p (var
)
15837 && (TYPE_PTRMEM_P (inner_type
) || CLASS_TYPE_P (inner_type
)))
15839 /* When the outermost open class is complete we can resolve any
15840 pointers-to-members. */
15841 tree context
= outermost_open_class ();
15842 incomplete_var iv
= {var
, context
};
15843 vec_safe_push (incomplete_vars
, iv
);
15848 /* Called when a class type (given by TYPE) is defined. If there are
15849 any existing VAR_DECLs whose type has been completed by this
15850 declaration, update them now. */
15853 complete_vars (tree type
)
15856 incomplete_var
*iv
;
15858 for (ix
= 0; vec_safe_iterate (incomplete_vars
, ix
, &iv
); )
15860 if (same_type_p (type
, iv
->incomplete_type
))
15862 tree var
= iv
->decl
;
15863 tree type
= TREE_TYPE (var
);
15865 if (type
!= error_mark_node
15866 && (TYPE_MAIN_VARIANT (strip_array_types (type
))
15867 == iv
->incomplete_type
))
15869 /* Complete the type of the variable. The VAR_DECL itself
15870 will be laid out in expand_expr. */
15871 complete_type (type
);
15872 cp_apply_type_quals_to_decl (cp_type_quals (type
), var
);
15875 /* Remove this entry from the list. */
15876 incomplete_vars
->unordered_remove (ix
);
15882 /* Check for pending declarations which may have abstract type. */
15883 complete_type_check_abstract (type
);
15886 /* If DECL is of a type which needs a cleanup, build and return an
15887 expression to perform that cleanup here. Return NULL_TREE if no
15888 cleanup need be done. DECL can also be a _REF when called from
15889 split_nonconstant_init_1. */
15892 cxx_maybe_build_cleanup (tree decl
, tsubst_flags_t complain
)
15898 /* Assume no cleanup is required. */
15899 cleanup
= NULL_TREE
;
15901 if (error_operand_p (decl
))
15904 /* Handle "__attribute__((cleanup))". We run the cleanup function
15905 before the destructor since the destructor is what actually
15906 terminates the lifetime of the object. */
15908 attr
= lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl
));
15917 /* Get the name specified by the user for the cleanup function. */
15918 id
= TREE_VALUE (TREE_VALUE (attr
));
15919 /* Look up the name to find the cleanup function to call. It is
15920 important to use lookup_name here because that is what is
15921 used in c-common.c:handle_cleanup_attribute when performing
15922 initial checks on the attribute. Note that those checks
15923 include ensuring that the function found is not an overloaded
15924 function, or an object with an overloaded call operator,
15925 etc.; we can rely on the fact that the function found is an
15926 ordinary FUNCTION_DECL. */
15927 fn
= lookup_name (id
);
15928 arg
= build_address (decl
);
15929 if (!mark_used (decl
, complain
) && !(complain
& tf_error
))
15930 return error_mark_node
;
15931 cleanup
= cp_build_function_call_nary (fn
, complain
, arg
, NULL_TREE
);
15932 if (cleanup
== error_mark_node
)
15933 return error_mark_node
;
15935 /* Handle ordinary C++ destructors. */
15936 type
= TREE_TYPE (decl
);
15937 if (type_build_dtor_call (type
))
15939 int flags
= LOOKUP_NORMAL
|LOOKUP_NONVIRTUAL
|LOOKUP_DESTRUCTOR
;
15943 if (TREE_CODE (type
) == ARRAY_TYPE
)
15946 addr
= build_address (decl
);
15948 call
= build_delete (TREE_TYPE (addr
), addr
,
15949 sfk_complete_destructor
, flags
, 0, complain
);
15950 if (call
== error_mark_node
)
15951 cleanup
= error_mark_node
;
15952 else if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type
))
15953 /* Discard the call. */;
15955 cleanup
= cp_build_compound_expr (cleanup
, call
, complain
);
15960 /* build_delete sets the location of the destructor call to the
15961 current location, even though the destructor is going to be
15962 called later, at the end of the current scope. This can lead to
15963 a "jumpy" behavior for users of debuggers when they step around
15964 the end of the block. So let's unset the location of the
15965 destructor call instead. */
15966 protected_set_expr_location (cleanup
, UNKNOWN_LOCATION
);
15970 && !lookup_attribute ("warn_unused", TYPE_ATTRIBUTES (TREE_TYPE (decl
)))
15971 /* Treat objects with destructors as used; the destructor may do
15972 something substantive. */
15973 && !mark_used (decl
, complain
) && !(complain
& tf_error
))
15974 return error_mark_node
;
15980 /* Return the FUNCTION_TYPE that corresponds to MEMFNTYPE, which can be a
15981 FUNCTION_DECL, METHOD_TYPE, FUNCTION_TYPE, pointer or reference to
15982 METHOD_TYPE or FUNCTION_TYPE, or pointer to member function. */
15985 static_fn_type (tree memfntype
)
15990 if (TYPE_PTRMEMFUNC_P (memfntype
))
15991 memfntype
= TYPE_PTRMEMFUNC_FN_TYPE (memfntype
);
15992 if (POINTER_TYPE_P (memfntype
)
15993 || TREE_CODE (memfntype
) == FUNCTION_DECL
)
15994 memfntype
= TREE_TYPE (memfntype
);
15995 if (TREE_CODE (memfntype
) == FUNCTION_TYPE
)
15997 gcc_assert (TREE_CODE (memfntype
) == METHOD_TYPE
);
15998 args
= TYPE_ARG_TYPES (memfntype
);
15999 cp_ref_qualifier rqual
= type_memfn_rqual (memfntype
);
16000 fntype
= build_function_type (TREE_TYPE (memfntype
), TREE_CHAIN (args
));
16001 fntype
= apply_memfn_quals (fntype
, type_memfn_quals (memfntype
), rqual
);
16002 fntype
= (cp_build_type_attribute_variant
16003 (fntype
, TYPE_ATTRIBUTES (memfntype
)));
16004 fntype
= (build_exception_variant
16005 (fntype
, TYPE_RAISES_EXCEPTIONS (memfntype
)));
16006 if (TYPE_HAS_LATE_RETURN_TYPE (memfntype
))
16007 TYPE_HAS_LATE_RETURN_TYPE (fntype
) = 1;
16011 /* DECL was originally constructed as a non-static member function,
16012 but turned out to be static. Update it accordingly. */
16015 revert_static_member_fn (tree decl
)
16017 tree stype
= static_fn_type (decl
);
16018 cp_cv_quals quals
= type_memfn_quals (stype
);
16019 cp_ref_qualifier rqual
= type_memfn_rqual (stype
);
16021 if (quals
!= TYPE_UNQUALIFIED
|| rqual
!= REF_QUAL_NONE
)
16022 stype
= apply_memfn_quals (stype
, TYPE_UNQUALIFIED
, REF_QUAL_NONE
);
16024 TREE_TYPE (decl
) = stype
;
16026 if (DECL_ARGUMENTS (decl
))
16027 DECL_ARGUMENTS (decl
) = DECL_CHAIN (DECL_ARGUMENTS (decl
));
16028 DECL_STATIC_FUNCTION_P (decl
) = 1;
16031 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
16032 one of the language-independent trees. */
16034 enum cp_tree_node_structure_enum
16035 cp_tree_node_structure (union lang_tree_node
* t
)
16037 switch (TREE_CODE (&t
->generic
))
16039 case DEFAULT_ARG
: return TS_CP_DEFAULT_ARG
;
16040 case DEFERRED_NOEXCEPT
: return TS_CP_DEFERRED_NOEXCEPT
;
16041 case IDENTIFIER_NODE
: return TS_CP_IDENTIFIER
;
16042 case OVERLOAD
: return TS_CP_OVERLOAD
;
16043 case TEMPLATE_PARM_INDEX
: return TS_CP_TPI
;
16044 case PTRMEM_CST
: return TS_CP_PTRMEM
;
16045 case BASELINK
: return TS_CP_BASELINK
;
16046 case TEMPLATE_DECL
: return TS_CP_TEMPLATE_DECL
;
16047 case STATIC_ASSERT
: return TS_CP_STATIC_ASSERT
;
16048 case ARGUMENT_PACK_SELECT
: return TS_CP_ARGUMENT_PACK_SELECT
;
16049 case TRAIT_EXPR
: return TS_CP_TRAIT_EXPR
;
16050 case LAMBDA_EXPR
: return TS_CP_LAMBDA_EXPR
;
16051 case TEMPLATE_INFO
: return TS_CP_TEMPLATE_INFO
;
16052 case CONSTRAINT_INFO
: return TS_CP_CONSTRAINT_INFO
;
16053 case USERDEF_LITERAL
: return TS_CP_USERDEF_LITERAL
;
16054 default: return TS_CP_GENERIC
;
16058 /* Build the void_list_node (void_type_node having been created). */
16060 build_void_list_node (void)
16062 tree t
= build_tree_list (NULL_TREE
, void_type_node
);
16067 cp_missing_noreturn_ok_p (tree decl
)
16069 /* A missing noreturn is ok for the `main' function. */
16070 return DECL_MAIN_P (decl
);
16073 /* Return the decl used to identify the COMDAT group into which DECL should
16077 cxx_comdat_group (tree decl
)
16079 /* Virtual tables, construction virtual tables, and virtual table
16080 tables all go in a single COMDAT group, named after the primary
16082 if (VAR_P (decl
) && DECL_VTABLE_OR_VTT_P (decl
))
16083 decl
= CLASSTYPE_VTABLES (DECL_CONTEXT (decl
));
16084 /* For all other DECLs, the COMDAT group is the mangled name of the
16085 declaration itself. */
16088 while (DECL_THUNK_P (decl
))
16090 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
16091 into the same section as the target function. In that case
16092 we must return target's name. */
16093 tree target
= THUNK_TARGET (decl
);
16094 if (TARGET_USE_LOCAL_THUNK_ALIAS_P (target
)
16095 && DECL_SECTION_NAME (target
) != NULL
16096 && DECL_ONE_ONLY (target
))
16106 /* Returns the return type for FN as written by the user, which may include
16107 a placeholder for a deduced return type. */
16110 fndecl_declared_return_type (tree fn
)
16112 fn
= STRIP_TEMPLATE (fn
);
16113 if (FNDECL_USED_AUTO (fn
))
16115 struct language_function
*f
= NULL
;
16116 if (DECL_STRUCT_FUNCTION (fn
))
16117 f
= DECL_STRUCT_FUNCTION (fn
)->language
;
16119 f
= DECL_SAVED_FUNCTION_DATA (fn
);
16120 return f
->x_auto_return_pattern
;
16122 return TREE_TYPE (TREE_TYPE (fn
));
16125 /* Returns true iff DECL was declared with an auto type and it has
16126 not yet been deduced to a real type. */
16129 undeduced_auto_decl (tree decl
)
16131 if (cxx_dialect
< cxx11
)
16133 return type_uses_auto (TREE_TYPE (decl
));
16136 /* Complain if DECL has an undeduced return type. */
16139 require_deduced_type (tree decl
, tsubst_flags_t complain
)
16141 if (undeduced_auto_decl (decl
))
16143 if (complain
& tf_error
)
16144 error ("use of %qD before deduction of %<auto%>", decl
);
16150 #include "gt-cp-decl.h"