1 /* Process declarations and variables for C++ compiler.
2 Copyright (C) 1988-2016 Free Software Foundation, Inc.
3 Contributed by Michael Tiemann (tiemann@cygnus.com)
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3, or (at your option)
12 GCC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING3. If not see
19 <http://www.gnu.org/licenses/>. */
22 /* Process declarations and symbol lookup for C++ front end.
23 Also constructs types; the standard scalar types at initialization,
24 and structure, union, array and enum types when they are declared. */
26 /* ??? not all decl nodes are given the most useful possible
27 line numbers. For example, the CONST_DECLs for enum values. */
31 #include "coretypes.h"
33 #include "c-family/c-target.h"
36 #include "stringpool.h"
38 #include "stor-layout.h"
42 #include "tree-iterator.h"
46 #include "c-family/c-objc.h"
47 #include "c-family/c-pragma.h"
48 #include "c-family/c-ubsan.h"
54 /* Possible cases of bad specifiers type used by bad_specifiers. */
56 BSP_VAR
, /* variable */
57 BSP_PARM
, /* parameter */
62 static const char *redeclaration_error_message (tree
, tree
);
64 static int decl_jump_unsafe (tree
);
65 static void require_complete_types_for_parms (tree
);
66 static int ambi_op_p (enum tree_code
);
67 static int unary_op_p (enum tree_code
);
68 static void push_local_name (tree
);
69 static tree
grok_reference_init (tree
, tree
, tree
, int);
70 static tree
grokvardecl (tree
, tree
, tree
, const cp_decl_specifier_seq
*,
71 int, int, int, bool, int, tree
);
72 static int check_static_variable_definition (tree
, tree
);
73 static void record_unknown_type (tree
, const char *);
74 static tree
builtin_function_1 (tree
, tree
, bool);
75 static int member_function_or_else (tree
, tree
, enum overload_flags
);
76 static void check_for_uninitialized_const_var (tree
);
77 static tree
local_variable_p_walkfn (tree
*, int *, void *);
78 static const char *tag_name (enum tag_types
);
79 static tree
lookup_and_check_tag (enum tag_types
, tree
, tag_scope
, bool);
80 static int walk_namespaces_r (tree
, walk_namespaces_fn
, void *);
81 static void maybe_deduce_size_from_array_init (tree
, tree
);
82 static void layout_var_decl (tree
);
83 static tree
check_initializer (tree
, tree
, int, vec
<tree
, va_gc
> **);
84 static void make_rtl_for_nonlocal_decl (tree
, tree
, const char *);
85 static void save_function_data (tree
);
86 static void copy_type_enum (tree
, tree
);
87 static void check_function_type (tree
, tree
);
88 static void finish_constructor_body (void);
89 static void begin_destructor_body (void);
90 static void finish_destructor_body (void);
91 static void record_key_method_defined (tree
);
92 static tree
create_array_type_for_decl (tree
, tree
, tree
);
93 static tree
get_atexit_node (void);
94 static tree
get_dso_handle_node (void);
95 static tree
start_cleanup_fn (void);
96 static void end_cleanup_fn (void);
97 static tree
cp_make_fname_decl (location_t
, tree
, int);
98 static void initialize_predefined_identifiers (void);
99 static tree check_special_function_return_type
100 (special_function_kind
, tree
, tree
, int, const location_t
*);
101 static tree
push_cp_library_fn (enum tree_code
, tree
, int);
102 static tree
build_cp_library_fn (tree
, enum tree_code
, tree
, int);
103 static void store_parm_decls (tree
);
104 static void initialize_local_var (tree
, tree
);
105 static void expand_static_init (tree
, tree
);
107 /* The following symbols are subsumed in the cp_global_trees array, and
108 listed here individually for documentation purposes.
111 tree wchar_decl_node;
113 tree vtable_entry_type;
114 tree delta_type_node;
115 tree __t_desc_type_node;
117 tree class_type_node;
118 tree unknown_type_node;
120 Array type `vtable_entry_type[]'
123 tree vtbl_ptr_type_node;
130 A FUNCTION_DECL which can call `abort'. Not necessarily the
131 one that the user will declare, but sufficient to be called
132 by routines that want to abort the program.
137 tree type_info_type_node, tinfo_decl_id, tinfo_decl_type;
138 tree tinfo_var_id; */
140 tree cp_global_trees
[CPTI_MAX
];
142 /* Indicates that there is a type value in some namespace, although
143 that is not necessarily in scope at the moment. */
145 tree global_type_node
;
147 /* The node that holds the "name" of the global scope. */
148 tree global_scope_name
;
150 #define local_names cp_function_chain->x_local_names
152 /* A list of objects which have constructors or destructors
153 which reside in the global scope. The decl is stored in
154 the TREE_VALUE slot and the initializer is stored
155 in the TREE_PURPOSE slot. */
156 tree static_aggregates
;
158 /* Like static_aggregates, but for thread_local variables. */
163 /* A node for the integer constant 2. */
165 tree integer_two_node
;
167 /* Used only for jumps to as-yet undefined labels, since jumps to
168 defined labels can have their validity checked immediately. */
170 struct GTY((chain_next ("%h.next"))) named_label_use_entry
{
171 struct named_label_use_entry
*next
;
172 /* The binding level to which this entry is *currently* attached.
173 This is initially the binding level in which the goto appeared,
174 but is modified as scopes are closed. */
175 cp_binding_level
*binding_level
;
176 /* The head of the names list that was current when the goto appeared,
177 or the inner scope popped. These are the decls that will *not* be
178 skipped when jumping to the label. */
180 /* The location of the goto, for error reporting. */
181 location_t o_goto_locus
;
182 /* True if an OpenMP structured block scope has been closed since
183 the goto appeared. This means that the branch from the label will
184 illegally exit an OpenMP scope. */
188 /* A list of all LABEL_DECLs in the function that have names. Here so
189 we can clear out their names' definitions at the end of the
190 function, and so we can check the validity of jumps to these labels. */
192 struct GTY((for_user
)) named_label_entry
{
193 /* The decl itself. */
196 /* The binding level to which the label is *currently* attached.
197 This is initially set to the binding level in which the label
198 is defined, but is modified as scopes are closed. */
199 cp_binding_level
*binding_level
;
200 /* The head of the names list that was current when the label was
201 defined, or the inner scope popped. These are the decls that will
202 be skipped when jumping to the label. */
204 /* A vector of all decls from all binding levels that would be
205 crossed by a backward branch to the label. */
206 vec
<tree
, va_gc
> *bad_decls
;
208 /* A list of uses of the label, before the label is defined. */
209 struct named_label_use_entry
*uses
;
211 /* The following bits are set after the label is defined, and are
212 updated as scopes are popped. They indicate that a backward jump
213 to the label will illegally enter a scope of the given flavor. */
217 bool in_transaction_scope
;
218 bool in_constexpr_if
;
221 #define named_labels cp_function_chain->x_named_labels
223 /* The number of function bodies which we are currently processing.
224 (Zero if we are at namespace scope, one inside the body of a
225 function, two inside the body of a function in a local class, etc.) */
228 /* Whether the exception-specifier is part of a function type (i.e. C++17). */
229 bool flag_noexcept_type
;
231 /* States indicating how grokdeclarator() should handle declspecs marked
232 with __attribute__((deprecated)). An object declared as
233 __attribute__((deprecated)) suppresses warnings of uses of other
235 enum deprecated_states deprecated_state
= DEPRECATED_NORMAL
;
238 /* A list of VAR_DECLs whose type was incomplete at the time the
239 variable was declared. */
241 struct GTY(()) incomplete_var
{
243 tree incomplete_type
;
247 static GTY(()) vec
<incomplete_var
, va_gc
> *incomplete_vars
;
249 /* Returns the kind of template specialization we are currently
250 processing, given that it's declaration contained N_CLASS_SCOPES
251 explicit scope qualifications. */
254 current_tmpl_spec_kind (int n_class_scopes
)
256 int n_template_parm_scopes
= 0;
257 int seen_specialization_p
= 0;
258 int innermost_specialization_p
= 0;
261 /* Scan through the template parameter scopes. */
262 for (b
= current_binding_level
;
263 b
->kind
== sk_template_parms
;
266 /* If we see a specialization scope inside a parameter scope,
267 then something is wrong. That corresponds to a declaration
270 template <class T> template <> ...
272 which is always invalid since [temp.expl.spec] forbids the
273 specialization of a class member template if the enclosing
274 class templates are not explicitly specialized as well. */
275 if (b
->explicit_spec_p
)
277 if (n_template_parm_scopes
== 0)
278 innermost_specialization_p
= 1;
280 seen_specialization_p
= 1;
282 else if (seen_specialization_p
== 1)
283 return tsk_invalid_member_spec
;
285 ++n_template_parm_scopes
;
288 /* Handle explicit instantiations. */
289 if (processing_explicit_instantiation
)
291 if (n_template_parm_scopes
!= 0)
292 /* We've seen a template parameter list during an explicit
293 instantiation. For example:
295 template <class T> template void f(int);
297 This is erroneous. */
298 return tsk_invalid_expl_inst
;
300 return tsk_expl_inst
;
303 if (n_template_parm_scopes
< n_class_scopes
)
304 /* We've not seen enough template headers to match all the
305 specialized classes present. For example:
307 template <class T> void R<T>::S<T>::f(int);
309 This is invalid; there needs to be one set of template
310 parameters for each class. */
311 return tsk_insufficient_parms
;
312 else if (n_template_parm_scopes
== n_class_scopes
)
313 /* We're processing a non-template declaration (even though it may
314 be a member of a template class.) For example:
316 template <class T> void S<T>::f(int);
318 The `class T' matches the `S<T>', leaving no template headers
319 corresponding to the `f'. */
321 else if (n_template_parm_scopes
> n_class_scopes
+ 1)
322 /* We've got too many template headers. For example:
324 template <> template <class T> void f (T);
326 There need to be more enclosing classes. */
327 return tsk_excessive_parms
;
329 /* This must be a template. It's of the form:
331 template <class T> template <class U> void S<T>::f(U);
333 This is a specialization if the innermost level was a
334 specialization; otherwise it's just a definition of the
336 return innermost_specialization_p
? tsk_expl_spec
: tsk_template
;
339 /* Exit the current scope. */
347 /* When a label goes out of scope, check to see if that label was used
348 in a valid manner, and issue any appropriate warnings or errors. */
351 pop_label (tree label
, tree old_value
)
353 if (!processing_template_decl
)
355 if (DECL_INITIAL (label
) == NULL_TREE
)
359 error ("label %q+D used but not defined", label
);
360 location
= input_location
;
361 /* FIXME want (LOCATION_FILE (input_location), (line)0) */
362 /* Avoid crashing later. */
363 define_label (location
, DECL_NAME (label
));
366 warn_for_unused_label (label
);
369 SET_IDENTIFIER_LABEL_VALUE (DECL_NAME (label
), old_value
);
372 /* Push all named labels into a vector, so that we can sort it on DECL_UID
373 to avoid code generation differences. */
376 note_label (named_label_entry
**slot
, vec
<named_label_entry
**> &labels
)
378 labels
.quick_push (slot
);
382 /* Helper function to sort named label entries in a vector by DECL_UID. */
385 sort_labels (const void *a
, const void *b
)
387 named_label_entry
**slot1
= *(named_label_entry
**const *) a
;
388 named_label_entry
**slot2
= *(named_label_entry
**const *) b
;
389 if (DECL_UID ((*slot1
)->label_decl
) < DECL_UID ((*slot2
)->label_decl
))
391 if (DECL_UID ((*slot1
)->label_decl
) > DECL_UID ((*slot2
)->label_decl
))
396 /* At the end of a function, all labels declared within the function
397 go out of scope. BLOCK is the top-level block for the
401 pop_labels (tree block
)
405 auto_vec
<named_label_entry
**, 32> labels
;
406 named_label_entry
**slot
;
409 /* Push all the labels into a vector and sort them by DECL_UID,
410 so that gaps between DECL_UIDs don't affect code generation. */
411 labels
.reserve_exact (named_labels
->elements ());
412 named_labels
->traverse
<vec
<named_label_entry
**> &, note_label
> (labels
);
413 labels
.qsort (sort_labels
);
414 FOR_EACH_VEC_ELT (labels
, i
, slot
)
416 struct named_label_entry
*ent
= *slot
;
418 pop_label (ent
->label_decl
, NULL_TREE
);
420 /* Put the labels into the "variables" of the top-level block,
421 so debugger can see them. */
422 DECL_CHAIN (ent
->label_decl
) = BLOCK_VARS (block
);
423 BLOCK_VARS (block
) = ent
->label_decl
;
425 named_labels
->clear_slot (slot
);
431 /* At the end of a block with local labels, restore the outer definition. */
434 pop_local_label (tree label
, tree old_value
)
436 struct named_label_entry dummy
;
438 pop_label (label
, old_value
);
440 dummy
.label_decl
= label
;
441 named_label_entry
**slot
= named_labels
->find_slot (&dummy
, NO_INSERT
);
442 named_labels
->clear_slot (slot
);
445 /* The following two routines are used to interface to Objective-C++.
446 The binding level is purposely treated as an opaque type. */
449 objc_get_current_scope (void)
451 return current_binding_level
;
454 /* The following routine is used by the NeXT-style SJLJ exceptions;
455 variables get marked 'volatile' so as to not be clobbered by
456 _setjmp()/_longjmp() calls. All variables in the current scope,
457 as well as parent scopes up to (but not including) ENCLOSING_BLK
458 shall be thusly marked. */
461 objc_mark_locals_volatile (void *enclosing_blk
)
463 cp_binding_level
*scope
;
465 for (scope
= current_binding_level
;
466 scope
&& scope
!= enclosing_blk
;
467 scope
= scope
->level_chain
)
471 for (decl
= scope
->names
; decl
; decl
= TREE_CHAIN (decl
))
472 objc_volatilize_decl (decl
);
474 /* Do not climb up past the current function. */
475 if (scope
->kind
== sk_function_parms
)
480 /* True if B is the level for the condition of a constexpr if. */
483 level_for_constexpr_if (cp_binding_level
*b
)
485 return (b
->kind
== sk_cond
&& b
->this_entity
486 && TREE_CODE (b
->this_entity
) == IF_STMT
487 && IF_STMT_CONSTEXPR_P (b
->this_entity
));
490 /* Update data for defined and undefined labels when leaving a scope. */
493 poplevel_named_label_1 (named_label_entry
**slot
, cp_binding_level
*bl
)
495 named_label_entry
*ent
= *slot
;
496 cp_binding_level
*obl
= bl
->level_chain
;
498 if (ent
->binding_level
== bl
)
502 /* ENT->NAMES_IN_SCOPE may contain a mixture of DECLs and
503 TREE_LISTs representing OVERLOADs, so be careful. */
504 for (decl
= ent
->names_in_scope
; decl
; decl
= (DECL_P (decl
)
506 : TREE_CHAIN (decl
)))
507 if (decl_jump_unsafe (decl
))
508 vec_safe_push (ent
->bad_decls
, decl
);
510 ent
->binding_level
= obl
;
511 ent
->names_in_scope
= obl
->names
;
515 ent
->in_try_scope
= true;
518 ent
->in_catch_scope
= true;
521 ent
->in_omp_scope
= true;
524 ent
->in_transaction_scope
= true;
527 if (level_for_constexpr_if (bl
->level_chain
))
528 ent
->in_constexpr_if
= true;
536 struct named_label_use_entry
*use
;
538 for (use
= ent
->uses
; use
; use
= use
->next
)
539 if (use
->binding_level
== bl
)
541 use
->binding_level
= obl
;
542 use
->names_in_scope
= obl
->names
;
543 if (bl
->kind
== sk_omp
)
544 use
->in_omp_scope
= true;
551 /* Saved errorcount to avoid -Wunused-but-set-{parameter,variable} warnings
552 when errors were reported, except for -Werror-unused-but-set-*. */
553 static int unused_but_set_errorcount
;
555 /* Exit a binding level.
556 Pop the level off, and restore the state of the identifier-decl mappings
557 that were in effect when this level was entered.
559 If KEEP == 1, this level had explicit declarations, so
560 and create a "block" (a BLOCK node) for the level
561 to record its declarations and subblocks for symbol table output.
563 If FUNCTIONBODY is nonzero, this level is the body of a function,
564 so create a block as if KEEP were set and also clear out all
567 If REVERSE is nonzero, reverse the order of decls before putting
568 them into the BLOCK. */
571 poplevel (int keep
, int reverse
, int functionbody
)
574 /* The chain of decls was accumulated in reverse order.
575 Put it into forward order, just for cleanliness. */
580 int leaving_for_scope
;
583 cp_label_binding
*label_bind
;
585 bool subtime
= timevar_cond_start (TV_NAME_LOOKUP
);
590 gcc_assert (current_binding_level
->kind
!= sk_class
);
592 if (current_binding_level
->kind
== sk_cleanup
)
594 subblocks
= functionbody
>= 0 ? current_binding_level
->blocks
: 0;
596 gcc_assert (!vec_safe_length (current_binding_level
->class_shadowed
));
598 /* We used to use KEEP == 2 to indicate that the new block should go
599 at the beginning of the list of blocks at this binding level,
600 rather than the end. This hack is no longer used. */
601 gcc_assert (keep
== 0 || keep
== 1);
603 if (current_binding_level
->keep
)
606 /* Any uses of undefined labels, and any defined labels, now operate
607 under constraints of next binding contour. */
608 if (cfun
&& !functionbody
&& named_labels
)
609 named_labels
->traverse
<cp_binding_level
*, poplevel_named_label_1
>
610 (current_binding_level
);
612 /* Get the decls in the order they were written.
613 Usually current_binding_level->names is in reverse order.
614 But parameter decls were previously put in forward order. */
617 current_binding_level
->names
618 = decls
= nreverse (current_binding_level
->names
);
620 decls
= current_binding_level
->names
;
622 /* If there were any declarations or structure tags in that level,
623 or if this level is a function body,
624 create a BLOCK to record them for the life of this function. */
626 /* Avoid function body block if possible. */
627 if (functionbody
&& subblocks
&& BLOCK_CHAIN (subblocks
) == NULL_TREE
)
629 else if (keep
== 1 || functionbody
)
630 block
= make_node (BLOCK
);
631 if (block
!= NULL_TREE
)
633 BLOCK_VARS (block
) = decls
;
634 BLOCK_SUBBLOCKS (block
) = subblocks
;
637 /* In each subblock, record that this is its superior. */
639 for (link
= subblocks
; link
; link
= BLOCK_CHAIN (link
))
640 BLOCK_SUPERCONTEXT (link
) = block
;
642 /* We still support the old for-scope rules, whereby the variables
643 in a init statement were in scope after the for-statement ended.
644 We only use the new rules if flag_new_for_scope is nonzero. */
646 = current_binding_level
->kind
== sk_for
&& flag_new_for_scope
== 1;
648 /* Before we remove the declarations first check for unused variables. */
649 if ((warn_unused_variable
|| warn_unused_but_set_variable
)
650 && current_binding_level
->kind
!= sk_template_parms
651 && !processing_template_decl
)
652 for (tree d
= getdecls (); d
; d
= TREE_CHAIN (d
))
654 /* There are cases where D itself is a TREE_LIST. See in
655 push_local_binding where the list of decls returned by
656 getdecls is built. */
657 decl
= TREE_CODE (d
) == TREE_LIST
? TREE_VALUE (d
) : d
;
658 tree type
= TREE_TYPE (decl
);
660 && (! TREE_USED (decl
) || !DECL_READ_P (decl
))
661 && ! DECL_IN_SYSTEM_HEADER (decl
)
662 && DECL_NAME (decl
) && ! DECL_ARTIFICIAL (decl
)
663 && type
!= error_mark_node
664 && (!CLASS_TYPE_P (type
)
665 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type
)
666 || lookup_attribute ("warn_unused",
667 TYPE_ATTRIBUTES (TREE_TYPE (decl
)))))
669 if (! TREE_USED (decl
))
670 warning_at (DECL_SOURCE_LOCATION (decl
),
671 OPT_Wunused_variable
, "unused variable %qD", decl
);
672 else if (DECL_CONTEXT (decl
) == current_function_decl
673 // For -Wunused-but-set-variable leave references alone.
674 && TREE_CODE (TREE_TYPE (decl
)) != REFERENCE_TYPE
675 && errorcount
== unused_but_set_errorcount
)
677 warning_at (DECL_SOURCE_LOCATION (decl
),
678 OPT_Wunused_but_set_variable
,
679 "variable %qD set but not used", decl
);
680 unused_but_set_errorcount
= errorcount
;
685 /* Remove declarations for all the DECLs in this level. */
686 for (link
= decls
; link
; link
= TREE_CHAIN (link
))
688 if (leaving_for_scope
&& VAR_P (link
)
689 /* It's hard to make this ARM compatibility hack play nicely with
690 lambdas, and it really isn't necessary in C++11 mode. */
691 && cxx_dialect
< cxx11
694 tree name
= DECL_NAME (link
);
698 ob
= outer_binding (name
,
699 IDENTIFIER_BINDING (name
),
702 ns_binding
= IDENTIFIER_NAMESPACE_VALUE (name
);
704 ns_binding
= NULL_TREE
;
706 if (ob
&& ob
->scope
== current_binding_level
->level_chain
)
707 /* We have something like:
712 and we are leaving the `for' scope. There's no reason to
713 keep the binding of the inner `i' in this case. */
714 pop_binding (name
, link
);
715 else if ((ob
&& (TREE_CODE (ob
->value
) == TYPE_DECL
))
716 || (ns_binding
&& TREE_CODE (ns_binding
) == TYPE_DECL
))
717 /* Here, we have something like:
725 We must pop the for-scope binding so we know what's a
726 type and what isn't. */
727 pop_binding (name
, link
);
730 /* Mark this VAR_DECL as dead so that we can tell we left it
731 there only for backward compatibility. */
732 DECL_DEAD_FOR_LOCAL (link
) = 1;
734 /* Keep track of what should have happened when we
735 popped the binding. */
738 SET_DECL_SHADOWED_FOR_VAR (link
, ob
->value
);
739 DECL_HAS_SHADOWED_FOR_VAR_P (link
) = 1;
742 /* Add it to the list of dead variables in the next
743 outermost binding to that we can remove these when we
744 leave that binding. */
746 current_binding_level
->level_chain
->dead_vars_from_for
,
749 /* Although we don't pop the cxx_binding, we do clear
750 its SCOPE since the scope is going away now. */
751 IDENTIFIER_BINDING (name
)->scope
752 = current_binding_level
->level_chain
;
759 /* Remove the binding. */
762 if (TREE_CODE (decl
) == TREE_LIST
)
763 decl
= TREE_VALUE (decl
);
766 if (TREE_CODE (name
) == OVERLOAD
)
767 name
= OVL_FUNCTION (name
);
769 gcc_assert (DECL_P (name
));
770 pop_binding (DECL_NAME (name
), decl
);
774 /* Remove declarations for any `for' variables from inner scopes
775 that we kept around. */
776 FOR_EACH_VEC_SAFE_ELT_REVERSE (current_binding_level
->dead_vars_from_for
,
778 pop_binding (DECL_NAME (decl
), decl
);
780 /* Restore the IDENTIFIER_TYPE_VALUEs. */
781 for (link
= current_binding_level
->type_shadowed
;
782 link
; link
= TREE_CHAIN (link
))
783 SET_IDENTIFIER_TYPE_VALUE (TREE_PURPOSE (link
), TREE_VALUE (link
));
785 /* Restore the IDENTIFIER_LABEL_VALUEs for local labels. */
786 FOR_EACH_VEC_SAFE_ELT_REVERSE (current_binding_level
->shadowed_labels
,
788 pop_local_label (label_bind
->label
, label_bind
->prev_value
);
790 /* There may be OVERLOADs (wrapped in TREE_LISTs) on the BLOCK_VARs
791 list if a `using' declaration put them there. The debugging
792 back ends won't understand OVERLOAD, so we remove them here.
793 Because the BLOCK_VARS are (temporarily) shared with
794 CURRENT_BINDING_LEVEL->NAMES we must do this fixup after we have
795 popped all the bindings. */
800 for (d
= &BLOCK_VARS (block
); *d
; )
802 if (TREE_CODE (*d
) == TREE_LIST
)
803 *d
= TREE_CHAIN (*d
);
805 d
= &DECL_CHAIN (*d
);
809 /* If the level being exited is the top level of a function,
810 check over all the labels. */
815 /* Since this is the top level block of a function, the vars are
816 the function's parameters. Don't leave them in the BLOCK
817 because they are found in the FUNCTION_DECL instead. */
818 BLOCK_VARS (block
) = 0;
822 pop_labels (subblocks
);
825 kind
= current_binding_level
->kind
;
826 if (kind
== sk_cleanup
)
830 /* If this is a temporary binding created for a cleanup, then we'll
831 have pushed a statement list level. Pop that, create a new
832 BIND_EXPR for the block, and insert it into the stream. */
833 stmt
= pop_stmt_list (current_binding_level
->statement_list
);
834 stmt
= c_build_bind_expr (input_location
, block
, stmt
);
841 /* The current function is being defined, so its DECL_INITIAL
842 should be error_mark_node. */
843 gcc_assert (DECL_INITIAL (current_function_decl
) == error_mark_node
);
844 DECL_INITIAL (current_function_decl
) = block
? block
: subblocks
;
847 if (FUNCTION_NEEDS_BODY_BLOCK (current_function_decl
))
849 if (BLOCK_SUBBLOCKS (subblocks
))
850 BLOCK_OUTER_CURLY_BRACE_P (BLOCK_SUBBLOCKS (subblocks
)) = 1;
853 BLOCK_OUTER_CURLY_BRACE_P (subblocks
) = 1;
857 current_binding_level
->blocks
858 = block_chainon (current_binding_level
->blocks
, block
);
860 /* If we did not make a block for the level just exited,
861 any blocks made for inner levels
862 (since they cannot be recorded as subblocks in that level)
863 must be carried forward so they will later become subblocks
864 of something else. */
866 current_binding_level
->blocks
867 = block_chainon (current_binding_level
->blocks
, subblocks
);
869 /* Each and every BLOCK node created here in `poplevel' is important
870 (e.g. for proper debugging information) so if we created one
871 earlier, mark it as "used". */
873 TREE_USED (block
) = 1;
875 /* All temporary bindings created for cleanups are popped silently. */
876 if (kind
== sk_cleanup
)
879 timevar_cond_stop (TV_NAME_LOOKUP
, subtime
);
883 /* Walk all the namespaces contained NAMESPACE, including NAMESPACE
884 itself, calling F for each. The DATA is passed to F as well. */
887 walk_namespaces_r (tree name_space
, walk_namespaces_fn f
, void* data
)
890 tree current
= NAMESPACE_LEVEL (name_space
)->namespaces
;
892 result
|= (*f
) (name_space
, data
);
894 for (; current
; current
= DECL_CHAIN (current
))
895 result
|= walk_namespaces_r (current
, f
, data
);
900 /* Walk all the namespaces, calling F for each. The DATA is passed to
904 walk_namespaces (walk_namespaces_fn f
, void* data
)
906 return walk_namespaces_r (global_namespace
, f
, data
);
909 /* Call wrapup_globals_declarations for the globals in NAMESPACE. */
912 wrapup_globals_for_namespace (tree name_space
, void* data ATTRIBUTE_UNUSED
)
914 cp_binding_level
*level
= NAMESPACE_LEVEL (name_space
);
915 vec
<tree
, va_gc
> *statics
= level
->static_decls
;
916 tree
*vec
= statics
->address ();
917 int len
= statics
->length ();
919 if (warn_unused_function
)
923 FOR_EACH_VEC_SAFE_ELT (statics
, i
, decl
)
924 if (TREE_CODE (decl
) == FUNCTION_DECL
925 && DECL_INITIAL (decl
) == 0
926 && DECL_EXTERNAL (decl
)
927 && !TREE_PUBLIC (decl
)
928 && !DECL_ARTIFICIAL (decl
)
929 && !TREE_NO_WARNING (decl
))
931 warning_at (DECL_SOURCE_LOCATION (decl
),
932 OPT_Wunused_function
,
933 "%qF declared %<static%> but never defined", decl
);
934 TREE_NO_WARNING (decl
) = 1;
938 /* Write out any globals that need to be output. */
939 return wrapup_global_declarations (vec
, len
);
942 /* Diagnose odr-used extern inline variables without definitions
943 in the current TU. */
945 diagnose_inline_vars_for_namespace (tree name_space
, void *)
947 cp_binding_level
*level
= NAMESPACE_LEVEL (name_space
);
948 vec
<tree
, va_gc
> *statics
= level
->static_decls
;
952 FOR_EACH_VEC_SAFE_ELT (statics
, i
, decl
)
954 && DECL_EXTERNAL (decl
)
955 && DECL_INLINE_VAR_P (decl
)
956 && DECL_ODR_USED (decl
))
957 error_at (DECL_SOURCE_LOCATION (decl
),
958 "odr-used inline variable %qD is not defined", decl
);
963 /* In C++, you don't have to write `struct S' to refer to `S'; you
964 can just use `S'. We accomplish this by creating a TYPE_DECL as
965 if the user had written `typedef struct S S'. Create and return
966 the TYPE_DECL for TYPE. */
969 create_implicit_typedef (tree name
, tree type
)
973 decl
= build_decl (input_location
, TYPE_DECL
, name
, type
);
974 DECL_ARTIFICIAL (decl
) = 1;
975 /* There are other implicit type declarations, like the one *within*
976 a class that allows you to write `S::S'. We must distinguish
978 SET_DECL_IMPLICIT_TYPEDEF_P (decl
);
979 TYPE_NAME (type
) = decl
;
980 TYPE_STUB_DECL (type
) = decl
;
985 /* Remember a local name for name-mangling purposes. */
988 push_local_name (tree decl
)
993 timevar_start (TV_NAME_LOOKUP
);
995 name
= DECL_NAME (decl
);
997 nelts
= vec_safe_length (local_names
);
998 for (i
= 0; i
< nelts
; i
++)
1000 t
= (*local_names
)[i
];
1001 if (DECL_NAME (t
) == name
)
1003 if (!DECL_LANG_SPECIFIC (decl
))
1004 retrofit_lang_decl (decl
);
1005 DECL_LANG_SPECIFIC (decl
)->u
.base
.u2sel
= 1;
1006 if (DECL_DISCRIMINATOR_SET_P (t
))
1007 DECL_DISCRIMINATOR (decl
) = DECL_DISCRIMINATOR (t
) + 1;
1009 DECL_DISCRIMINATOR (decl
) = 1;
1011 (*local_names
)[i
] = decl
;
1012 timevar_stop (TV_NAME_LOOKUP
);
1017 vec_safe_push (local_names
, decl
);
1018 timevar_stop (TV_NAME_LOOKUP
);
1021 /* Subroutine of duplicate_decls: return truthvalue of whether
1022 or not types of these decls match.
1024 For C++, we must compare the parameter list so that `int' can match
1025 `int&' in a parameter position, but `int&' is not confused with
1029 decls_match (tree newdecl
, tree olddecl
)
1033 if (newdecl
== olddecl
)
1036 if (TREE_CODE (newdecl
) != TREE_CODE (olddecl
))
1037 /* If the two DECLs are not even the same kind of thing, we're not
1038 interested in their types. */
1041 gcc_assert (DECL_P (newdecl
));
1043 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1045 tree f1
= TREE_TYPE (newdecl
);
1046 tree f2
= TREE_TYPE (olddecl
);
1047 tree p1
= TYPE_ARG_TYPES (f1
);
1048 tree p2
= TYPE_ARG_TYPES (f2
);
1051 /* Specializations of different templates are different functions
1052 even if they have the same type. */
1053 tree t1
= (DECL_USE_TEMPLATE (newdecl
)
1054 ? DECL_TI_TEMPLATE (newdecl
)
1056 tree t2
= (DECL_USE_TEMPLATE (olddecl
)
1057 ? DECL_TI_TEMPLATE (olddecl
)
1062 if (CP_DECL_CONTEXT (newdecl
) != CP_DECL_CONTEXT (olddecl
)
1063 && ! (DECL_EXTERN_C_P (newdecl
)
1064 && DECL_EXTERN_C_P (olddecl
)))
1067 /* A new declaration doesn't match a built-in one unless it
1068 is also extern "C". */
1069 if (DECL_IS_BUILTIN (olddecl
)
1070 && DECL_EXTERN_C_P (olddecl
) && !DECL_EXTERN_C_P (newdecl
))
1073 if (TREE_CODE (f1
) != TREE_CODE (f2
))
1076 /* A declaration with deduced return type should use its pre-deduction
1077 type for declaration matching. */
1078 r2
= fndecl_declared_return_type (olddecl
);
1080 if (same_type_p (TREE_TYPE (f1
), r2
))
1082 if (!prototype_p (f2
) && DECL_EXTERN_C_P (olddecl
)
1083 && (DECL_BUILT_IN (olddecl
)
1084 #ifndef NO_IMPLICIT_EXTERN_C
1085 || (DECL_IN_SYSTEM_HEADER (newdecl
) && !DECL_CLASS_SCOPE_P (newdecl
))
1086 || (DECL_IN_SYSTEM_HEADER (olddecl
) && !DECL_CLASS_SCOPE_P (olddecl
))
1090 types_match
= self_promoting_args_p (p1
);
1091 if (p1
== void_list_node
)
1092 TREE_TYPE (newdecl
) = TREE_TYPE (olddecl
);
1094 #ifndef NO_IMPLICIT_EXTERN_C
1095 else if (!prototype_p (f1
)
1096 && (DECL_EXTERN_C_P (olddecl
)
1097 && DECL_IN_SYSTEM_HEADER (olddecl
)
1098 && !DECL_CLASS_SCOPE_P (olddecl
))
1099 && (DECL_EXTERN_C_P (newdecl
)
1100 && DECL_IN_SYSTEM_HEADER (newdecl
)
1101 && !DECL_CLASS_SCOPE_P (newdecl
)))
1103 types_match
= self_promoting_args_p (p2
);
1104 TREE_TYPE (newdecl
) = TREE_TYPE (olddecl
);
1110 && type_memfn_rqual (f1
) == type_memfn_rqual (f2
)
1111 && (TYPE_ATTRIBUTES (TREE_TYPE (newdecl
)) == NULL_TREE
1112 || comp_type_attributes (TREE_TYPE (newdecl
),
1113 TREE_TYPE (olddecl
)) != 0);
1118 /* The decls dont match if they correspond to two different versions
1119 of the same function. Disallow extern "C" functions to be
1120 versions for now. */
1122 && !DECL_EXTERN_C_P (newdecl
)
1123 && !DECL_EXTERN_C_P (olddecl
)
1124 && targetm
.target_option
.function_versions (newdecl
, olddecl
))
1126 /* Mark functions as versions if necessary. Modify the mangled decl
1127 name if necessary. */
1128 if (DECL_FUNCTION_VERSIONED (newdecl
)
1129 && DECL_FUNCTION_VERSIONED (olddecl
))
1131 if (!DECL_FUNCTION_VERSIONED (newdecl
))
1133 DECL_FUNCTION_VERSIONED (newdecl
) = 1;
1134 if (DECL_ASSEMBLER_NAME_SET_P (newdecl
))
1135 mangle_decl (newdecl
);
1137 if (!DECL_FUNCTION_VERSIONED (olddecl
))
1139 DECL_FUNCTION_VERSIONED (olddecl
) = 1;
1140 if (DECL_ASSEMBLER_NAME_SET_P (olddecl
))
1141 mangle_decl (olddecl
);
1143 cgraph_node::record_function_versions (olddecl
, newdecl
);
1147 else if (TREE_CODE (newdecl
) == TEMPLATE_DECL
)
1149 tree oldres
= DECL_TEMPLATE_RESULT (olddecl
);
1150 tree newres
= DECL_TEMPLATE_RESULT (newdecl
);
1152 if (TREE_CODE (newres
) != TREE_CODE (oldres
))
1155 if (!comp_template_parms (DECL_TEMPLATE_PARMS (newdecl
),
1156 DECL_TEMPLATE_PARMS (olddecl
)))
1159 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl
)) == TYPE_DECL
)
1160 types_match
= (same_type_p (TREE_TYPE (oldres
), TREE_TYPE (newres
))
1161 && equivalently_constrained (olddecl
, newdecl
));
1163 // We don't need to check equivalently_constrained for variable and
1164 // function templates because we check it on the results.
1165 types_match
= decls_match (oldres
, newres
);
1169 /* Need to check scope for variable declaration (VAR_DECL).
1170 For typedef (TYPE_DECL), scope is ignored. */
1172 && CP_DECL_CONTEXT (newdecl
) != CP_DECL_CONTEXT (olddecl
)
1174 Two declarations for an object with C language linkage
1175 with the same name (ignoring the namespace that qualify
1176 it) that appear in different namespace scopes refer to
1178 && !(DECL_EXTERN_C_P (olddecl
) && DECL_EXTERN_C_P (newdecl
)))
1181 if (TREE_TYPE (newdecl
) == error_mark_node
)
1182 types_match
= TREE_TYPE (olddecl
) == error_mark_node
;
1183 else if (TREE_TYPE (olddecl
) == NULL_TREE
)
1184 types_match
= TREE_TYPE (newdecl
) == NULL_TREE
;
1185 else if (TREE_TYPE (newdecl
) == NULL_TREE
)
1188 types_match
= comptypes (TREE_TYPE (newdecl
),
1189 TREE_TYPE (olddecl
),
1190 COMPARE_REDECLARATION
);
1193 // Normal functions can be constrained, as can variable partial
1195 if (types_match
&& VAR_OR_FUNCTION_DECL_P (newdecl
))
1196 types_match
= equivalently_constrained (newdecl
, olddecl
);
1201 /* If NEWDECL is `static' and an `extern' was seen previously,
1202 warn about it. OLDDECL is the previous declaration.
1204 Note that this does not apply to the C++ case of declaring
1205 a variable `extern const' and then later `const'.
1207 Don't complain about built-in functions, since they are beyond
1208 the user's control. */
1211 warn_extern_redeclared_static (tree newdecl
, tree olddecl
)
1213 if (TREE_CODE (newdecl
) == TYPE_DECL
1214 || TREE_CODE (newdecl
) == TEMPLATE_DECL
1215 || TREE_CODE (newdecl
) == CONST_DECL
1216 || TREE_CODE (newdecl
) == NAMESPACE_DECL
)
1219 /* Don't get confused by static member functions; that's a different
1221 if (TREE_CODE (newdecl
) == FUNCTION_DECL
1222 && DECL_STATIC_FUNCTION_P (newdecl
))
1225 /* If the old declaration was `static', or the new one isn't, then
1226 everything is OK. */
1227 if (DECL_THIS_STATIC (olddecl
) || !DECL_THIS_STATIC (newdecl
))
1230 /* It's OK to declare a builtin function as `static'. */
1231 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1232 && DECL_ARTIFICIAL (olddecl
))
1235 if (permerror (DECL_SOURCE_LOCATION (newdecl
),
1236 "%qD was declared %<extern%> and later %<static%>", newdecl
))
1237 inform (DECL_SOURCE_LOCATION (olddecl
),
1238 "previous declaration of %qD", olddecl
);
1241 /* NEW_DECL is a redeclaration of OLD_DECL; both are functions or
1242 function templates. If their exception specifications do not
1243 match, issue a diagnostic. */
1246 check_redeclaration_exception_specification (tree new_decl
,
1249 tree new_exceptions
= TYPE_RAISES_EXCEPTIONS (TREE_TYPE (new_decl
));
1250 tree old_exceptions
= TYPE_RAISES_EXCEPTIONS (TREE_TYPE (old_decl
));
1252 /* Two default specs are equivalent, don't force evaluation. */
1253 if (UNEVALUATED_NOEXCEPT_SPEC_P (new_exceptions
)
1254 && UNEVALUATED_NOEXCEPT_SPEC_P (old_exceptions
))
1257 maybe_instantiate_noexcept (new_decl
);
1258 maybe_instantiate_noexcept (old_decl
);
1259 new_exceptions
= TYPE_RAISES_EXCEPTIONS (TREE_TYPE (new_decl
));
1260 old_exceptions
= TYPE_RAISES_EXCEPTIONS (TREE_TYPE (old_decl
));
1264 If any declaration of a function has an exception-specification,
1265 all declarations, including the definition and an explicit
1266 specialization, of that function shall have an
1267 exception-specification with the same set of type-ids. */
1268 if (! DECL_IS_BUILTIN (old_decl
)
1269 && !comp_except_specs (new_exceptions
, old_exceptions
, ce_normal
))
1272 = "declaration of %qF has a different exception specifier";
1273 bool complained
= true;
1274 location_t new_loc
= DECL_SOURCE_LOCATION (new_decl
);
1275 if (DECL_IN_SYSTEM_HEADER (old_decl
))
1276 complained
= pedwarn (new_loc
, OPT_Wsystem_headers
, msg
, new_decl
);
1277 else if (!flag_exceptions
)
1278 /* We used to silently permit mismatched eh specs with
1279 -fno-exceptions, so make them a pedwarn now. */
1280 complained
= pedwarn (new_loc
, OPT_Wpedantic
, msg
, new_decl
);
1282 error_at (new_loc
, msg
, new_decl
);
1284 inform (DECL_SOURCE_LOCATION (old_decl
),
1285 "from previous declaration %qF", old_decl
);
1289 /* Return true if OLD_DECL and NEW_DECL agree on constexprness.
1290 Otherwise issue diagnostics. */
1293 validate_constexpr_redeclaration (tree old_decl
, tree new_decl
)
1295 old_decl
= STRIP_TEMPLATE (old_decl
);
1296 new_decl
= STRIP_TEMPLATE (new_decl
);
1297 if (!VAR_OR_FUNCTION_DECL_P (old_decl
)
1298 || !VAR_OR_FUNCTION_DECL_P (new_decl
))
1300 if (DECL_DECLARED_CONSTEXPR_P (old_decl
)
1301 == DECL_DECLARED_CONSTEXPR_P (new_decl
))
1303 if (TREE_CODE (old_decl
) == FUNCTION_DECL
)
1305 if (DECL_BUILT_IN (old_decl
))
1307 /* Hide a built-in declaration. */
1308 DECL_DECLARED_CONSTEXPR_P (old_decl
)
1309 = DECL_DECLARED_CONSTEXPR_P (new_decl
);
1312 /* 7.1.5 [dcl.constexpr]
1313 Note: An explicit specialization can differ from the template
1314 declaration with respect to the constexpr specifier. */
1315 if (! DECL_TEMPLATE_SPECIALIZATION (old_decl
)
1316 && DECL_TEMPLATE_SPECIALIZATION (new_decl
))
1319 error_at (DECL_SOURCE_LOCATION (new_decl
),
1320 "redeclaration %qD differs in %<constexpr%> "
1321 "from previous declaration", new_decl
);
1322 inform (DECL_SOURCE_LOCATION (old_decl
),
1323 "previous declaration %qD", old_decl
);
1329 // If OLDDECL and NEWDECL are concept declarations with the same type
1330 // (i.e., and template parameters), but different requirements,
1331 // emit diagnostics and return true. Otherwise, return false.
1333 check_concept_refinement (tree olddecl
, tree newdecl
)
1335 if (!DECL_DECLARED_CONCEPT_P (olddecl
) || !DECL_DECLARED_CONCEPT_P (newdecl
))
1338 tree d1
= DECL_TEMPLATE_RESULT (olddecl
);
1339 tree d2
= DECL_TEMPLATE_RESULT (newdecl
);
1340 if (TREE_CODE (d1
) != TREE_CODE (d2
))
1343 tree t1
= TREE_TYPE (d1
);
1344 tree t2
= TREE_TYPE (d2
);
1345 if (TREE_CODE (d1
) == FUNCTION_DECL
)
1347 if (compparms (TYPE_ARG_TYPES (t1
), TYPE_ARG_TYPES (t2
))
1348 && comp_template_parms (DECL_TEMPLATE_PARMS (olddecl
),
1349 DECL_TEMPLATE_PARMS (newdecl
))
1350 && !equivalently_constrained (olddecl
, newdecl
))
1352 error ("cannot specialize concept %q#D", olddecl
);
1359 /* DECL is a redeclaration of a function or function template. If
1360 it does have default arguments issue a diagnostic. Note: this
1361 function is used to enforce the requirements in C++11 8.3.6 about
1362 no default arguments in redeclarations. */
1365 check_redeclaration_no_default_args (tree decl
)
1367 gcc_assert (DECL_DECLARES_FUNCTION_P (decl
));
1369 for (tree t
= FUNCTION_FIRST_USER_PARMTYPE (decl
);
1370 t
&& t
!= void_list_node
; t
= TREE_CHAIN (t
))
1371 if (TREE_PURPOSE (t
))
1373 permerror (DECL_SOURCE_LOCATION (decl
),
1374 "redeclaration of %q#D may not have default "
1380 #define GNU_INLINE_P(fn) (DECL_DECLARED_INLINE_P (fn) \
1381 && lookup_attribute ("gnu_inline", \
1382 DECL_ATTRIBUTES (fn)))
1384 /* If NEWDECL is a redeclaration of OLDDECL, merge the declarations.
1385 If the redeclaration is invalid, a diagnostic is issued, and the
1386 error_mark_node is returned. Otherwise, OLDDECL is returned.
1388 If NEWDECL is not a redeclaration of OLDDECL, NULL_TREE is
1391 NEWDECL_IS_FRIEND is true if NEWDECL was declared as a friend. */
1394 duplicate_decls (tree newdecl
, tree olddecl
, bool newdecl_is_friend
)
1396 unsigned olddecl_uid
= DECL_UID (olddecl
);
1397 int olddecl_friend
= 0, types_match
= 0, hidden_friend
= 0;
1398 int new_defines_function
= 0;
1399 tree new_template_info
;
1401 if (newdecl
== olddecl
)
1404 types_match
= decls_match (newdecl
, olddecl
);
1406 /* If either the type of the new decl or the type of the old decl is an
1407 error_mark_node, then that implies that we have already issued an
1408 error (earlier) for some bogus type specification, and in that case,
1409 it is rather pointless to harass the user with yet more error message
1410 about the same declaration, so just pretend the types match here. */
1411 if (TREE_TYPE (newdecl
) == error_mark_node
1412 || TREE_TYPE (olddecl
) == error_mark_node
)
1413 return error_mark_node
;
1415 if (UDLIT_OPER_P (DECL_NAME (newdecl
))
1416 && UDLIT_OPER_P (DECL_NAME (olddecl
)))
1418 if (TREE_CODE (newdecl
) == TEMPLATE_DECL
1419 && TREE_CODE (olddecl
) != TEMPLATE_DECL
1420 && check_raw_literal_operator (olddecl
))
1421 error ("literal operator template %q+D conflicts with"
1422 " raw literal operator %qD", newdecl
, olddecl
);
1423 else if (TREE_CODE (newdecl
) != TEMPLATE_DECL
1424 && TREE_CODE (olddecl
) == TEMPLATE_DECL
1425 && check_raw_literal_operator (newdecl
))
1426 error ("raw literal operator %q+D conflicts with"
1427 " literal operator template %qD", newdecl
, olddecl
);
1430 if (DECL_P (olddecl
)
1431 && TREE_CODE (newdecl
) == FUNCTION_DECL
1432 && TREE_CODE (olddecl
) == FUNCTION_DECL
1433 && diagnose_mismatched_attributes (olddecl
, newdecl
))
1435 if (DECL_INITIAL (olddecl
))
1436 inform (DECL_SOURCE_LOCATION (olddecl
),
1437 "previous definition of %qD was here", olddecl
);
1439 inform (DECL_SOURCE_LOCATION (olddecl
),
1440 "previous declaration of %qD was here", olddecl
);
1443 /* Check for redeclaration and other discrepancies. */
1444 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1445 && DECL_ARTIFICIAL (olddecl
))
1447 gcc_assert (!DECL_HIDDEN_FRIEND_P (olddecl
));
1448 if (TREE_CODE (newdecl
) != FUNCTION_DECL
)
1450 /* Avoid warnings redeclaring built-ins which have not been
1451 explicitly declared. */
1452 if (DECL_ANTICIPATED (olddecl
))
1455 /* If you declare a built-in or predefined function name as static,
1456 the old definition is overridden, but optionally warn this was a
1457 bad choice of name. */
1458 if (! TREE_PUBLIC (newdecl
))
1460 warning (OPT_Wshadow
,
1461 DECL_BUILT_IN (olddecl
)
1462 ? G_("shadowing built-in function %q#D")
1463 : G_("shadowing library function %q#D"), olddecl
);
1464 /* Discard the old built-in function. */
1467 /* If the built-in is not ansi, then programs can override
1468 it even globally without an error. */
1469 else if (! DECL_BUILT_IN (olddecl
))
1470 warning_at (DECL_SOURCE_LOCATION (newdecl
), 0,
1471 "library function %q#D redeclared as non-function %q#D",
1474 error ("declaration of %q+#D conflicts with built-in "
1475 "declaration %q#D", newdecl
, olddecl
);
1478 else if (DECL_OMP_DECLARE_REDUCTION_P (olddecl
))
1480 gcc_assert (DECL_OMP_DECLARE_REDUCTION_P (newdecl
));
1481 error_at (DECL_SOURCE_LOCATION (newdecl
),
1482 "redeclaration of %<pragma omp declare reduction%>");
1483 inform (DECL_SOURCE_LOCATION (olddecl
),
1484 "previous %<pragma omp declare reduction%> declaration");
1485 return error_mark_node
;
1487 else if (!types_match
)
1489 /* Avoid warnings redeclaring built-ins which have not been
1490 explicitly declared. */
1491 if (DECL_ANTICIPATED (olddecl
))
1493 /* Deal with fileptr_type_node. FILE type is not known
1494 at the time we create the builtins. */
1497 for (t1
= TYPE_ARG_TYPES (TREE_TYPE (newdecl
)),
1498 t2
= TYPE_ARG_TYPES (TREE_TYPE (olddecl
));
1500 t1
= TREE_CHAIN (t1
), t2
= TREE_CHAIN (t2
))
1503 else if (TREE_VALUE (t2
) == fileptr_type_node
)
1505 tree t
= TREE_VALUE (t1
);
1508 && TYPE_IDENTIFIER (TREE_TYPE (t
))
1509 == get_identifier ("FILE")
1510 && compparms (TREE_CHAIN (t1
), TREE_CHAIN (t2
)))
1512 tree oldargs
= TYPE_ARG_TYPES (TREE_TYPE (olddecl
));
1514 TYPE_ARG_TYPES (TREE_TYPE (olddecl
))
1515 = TYPE_ARG_TYPES (TREE_TYPE (newdecl
));
1516 types_match
= decls_match (newdecl
, olddecl
);
1518 return duplicate_decls (newdecl
, olddecl
,
1520 TYPE_ARG_TYPES (TREE_TYPE (olddecl
)) = oldargs
;
1523 else if (! same_type_p (TREE_VALUE (t1
), TREE_VALUE (t2
)))
1526 else if ((DECL_EXTERN_C_P (newdecl
)
1527 && DECL_EXTERN_C_P (olddecl
))
1528 || compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl
)),
1529 TYPE_ARG_TYPES (TREE_TYPE (olddecl
))))
1531 /* A near match; override the builtin. */
1533 if (TREE_PUBLIC (newdecl
))
1534 warning_at (DECL_SOURCE_LOCATION (newdecl
), 0,
1535 "new declaration %q#D ambiguates built-in "
1536 "declaration %q#D", newdecl
, olddecl
);
1538 warning (OPT_Wshadow
,
1539 DECL_BUILT_IN (olddecl
)
1540 ? G_("shadowing built-in function %q#D")
1541 : G_("shadowing library function %q#D"), olddecl
);
1544 /* Discard the old built-in function. */
1547 /* Replace the old RTL to avoid problems with inlining. */
1548 COPY_DECL_RTL (newdecl
, olddecl
);
1550 /* Even if the types match, prefer the new declarations type for
1551 built-ins which have not been explicitly declared, for
1552 exception lists, etc... */
1553 else if (DECL_IS_BUILTIN (olddecl
))
1555 tree type
= TREE_TYPE (newdecl
);
1556 tree attribs
= (*targetm
.merge_type_attributes
)
1557 (TREE_TYPE (olddecl
), type
);
1559 type
= cp_build_type_attribute_variant (type
, attribs
);
1560 TREE_TYPE (newdecl
) = TREE_TYPE (olddecl
) = type
;
1563 /* If a function is explicitly declared "throw ()", propagate that to
1564 the corresponding builtin. */
1565 if (DECL_BUILT_IN_CLASS (olddecl
) == BUILT_IN_NORMAL
1566 && DECL_ANTICIPATED (olddecl
)
1567 && TREE_NOTHROW (newdecl
)
1568 && !TREE_NOTHROW (olddecl
))
1570 enum built_in_function fncode
= DECL_FUNCTION_CODE (olddecl
);
1571 tree tmpdecl
= builtin_decl_explicit (fncode
);
1572 if (tmpdecl
&& tmpdecl
!= olddecl
&& types_match
)
1573 TREE_NOTHROW (tmpdecl
) = 1;
1576 /* Whether or not the builtin can throw exceptions has no
1577 bearing on this declarator. */
1578 TREE_NOTHROW (olddecl
) = 0;
1580 if (DECL_THIS_STATIC (newdecl
) && !DECL_THIS_STATIC (olddecl
))
1582 /* If a builtin function is redeclared as `static', merge
1583 the declarations, but make the original one static. */
1584 DECL_THIS_STATIC (olddecl
) = 1;
1585 TREE_PUBLIC (olddecl
) = 0;
1587 /* Make the old declaration consistent with the new one so
1588 that all remnants of the builtin-ness of this function
1589 will be banished. */
1590 SET_DECL_LANGUAGE (olddecl
, DECL_LANGUAGE (newdecl
));
1591 COPY_DECL_RTL (newdecl
, olddecl
);
1594 else if (TREE_CODE (olddecl
) != TREE_CODE (newdecl
))
1596 /* C++ Standard, 3.3, clause 4:
1597 "[Note: a namespace name or a class template name must be unique
1598 in its declarative region (7.3.2, clause 14). ]" */
1599 if (TREE_CODE (olddecl
) != NAMESPACE_DECL
1600 && TREE_CODE (newdecl
) != NAMESPACE_DECL
1601 && (TREE_CODE (olddecl
) != TEMPLATE_DECL
1602 || TREE_CODE (DECL_TEMPLATE_RESULT (olddecl
)) != TYPE_DECL
)
1603 && (TREE_CODE (newdecl
) != TEMPLATE_DECL
1604 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl
)) != TYPE_DECL
))
1606 if ((TREE_CODE (olddecl
) == TYPE_DECL
&& DECL_ARTIFICIAL (olddecl
)
1607 && TREE_CODE (newdecl
) != TYPE_DECL
)
1608 || (TREE_CODE (newdecl
) == TYPE_DECL
&& DECL_ARTIFICIAL (newdecl
)
1609 && TREE_CODE (olddecl
) != TYPE_DECL
))
1611 /* We do nothing special here, because C++ does such nasty
1612 things with TYPE_DECLs. Instead, just let the TYPE_DECL
1613 get shadowed, and know that if we need to find a TYPE_DECL
1614 for a given name, we can look in the IDENTIFIER_TYPE_VALUE
1615 slot of the identifier. */
1619 if ((TREE_CODE (newdecl
) == FUNCTION_DECL
1620 && DECL_FUNCTION_TEMPLATE_P (olddecl
))
1621 || (TREE_CODE (olddecl
) == FUNCTION_DECL
1622 && DECL_FUNCTION_TEMPLATE_P (newdecl
)))
1626 error ("%q#D redeclared as different kind of symbol", newdecl
);
1627 if (TREE_CODE (olddecl
) == TREE_LIST
)
1628 olddecl
= TREE_VALUE (olddecl
);
1629 inform (DECL_SOURCE_LOCATION (olddecl
),
1630 "previous declaration %q#D", olddecl
);
1632 return error_mark_node
;
1634 else if (!types_match
)
1636 if (CP_DECL_CONTEXT (newdecl
) != CP_DECL_CONTEXT (olddecl
))
1637 /* These are certainly not duplicate declarations; they're
1638 from different scopes. */
1641 if (TREE_CODE (newdecl
) == TEMPLATE_DECL
)
1643 /* The name of a class template may not be declared to refer to
1644 any other template, class, function, object, namespace, value,
1645 or type in the same scope. */
1646 if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl
)) == TYPE_DECL
1647 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl
)) == TYPE_DECL
)
1649 error ("conflicting declaration of template %q+#D", newdecl
);
1650 inform (DECL_SOURCE_LOCATION (olddecl
),
1651 "previous declaration %q#D", olddecl
);
1652 return error_mark_node
;
1654 else if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl
)) == FUNCTION_DECL
1655 && TREE_CODE (DECL_TEMPLATE_RESULT (newdecl
)) == FUNCTION_DECL
1656 && compparms (TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl
))),
1657 TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl
))))
1658 && comp_template_parms (DECL_TEMPLATE_PARMS (newdecl
),
1659 DECL_TEMPLATE_PARMS (olddecl
))
1660 /* Template functions can be disambiguated by
1662 && same_type_p (TREE_TYPE (TREE_TYPE (newdecl
)),
1663 TREE_TYPE (TREE_TYPE (olddecl
)))
1664 // Template functions can also be disambiguated by
1666 && equivalently_constrained (olddecl
, newdecl
))
1668 error ("ambiguating new declaration %q+#D", newdecl
);
1669 inform (DECL_SOURCE_LOCATION (olddecl
),
1670 "old declaration %q#D", olddecl
);
1672 else if (check_concept_refinement (olddecl
, newdecl
))
1673 return error_mark_node
;
1676 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1678 if (DECL_EXTERN_C_P (newdecl
) && DECL_EXTERN_C_P (olddecl
))
1680 error ("conflicting declaration of C function %q+#D",
1682 inform (DECL_SOURCE_LOCATION (olddecl
),
1683 "previous declaration %q#D", olddecl
);
1686 /* For function versions, params and types match, but they
1687 are not ambiguous. */
1688 else if ((!DECL_FUNCTION_VERSIONED (newdecl
)
1689 && !DECL_FUNCTION_VERSIONED (olddecl
))
1690 // The functions have the same parameter types.
1691 && compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl
)),
1692 TYPE_ARG_TYPES (TREE_TYPE (olddecl
)))
1693 // And the same constraints.
1694 && equivalently_constrained (newdecl
, olddecl
))
1696 error ("ambiguating new declaration of %q+#D", newdecl
);
1697 inform (DECL_SOURCE_LOCATION (olddecl
),
1698 "old declaration %q#D", olddecl
);
1699 return error_mark_node
;
1706 error ("conflicting declaration %q+#D", newdecl
);
1707 inform (DECL_SOURCE_LOCATION (olddecl
),
1708 "previous declaration as %q#D", olddecl
);
1709 return error_mark_node
;
1712 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
1713 && ((DECL_TEMPLATE_SPECIALIZATION (olddecl
)
1714 && (!DECL_TEMPLATE_INFO (newdecl
)
1715 || (DECL_TI_TEMPLATE (newdecl
)
1716 != DECL_TI_TEMPLATE (olddecl
))))
1717 || (DECL_TEMPLATE_SPECIALIZATION (newdecl
)
1718 && (!DECL_TEMPLATE_INFO (olddecl
)
1719 || (DECL_TI_TEMPLATE (olddecl
)
1720 != DECL_TI_TEMPLATE (newdecl
))))))
1721 /* It's OK to have a template specialization and a non-template
1722 with the same type, or to have specializations of two
1723 different templates with the same type. Note that if one is a
1724 specialization, and the other is an instantiation of the same
1725 template, that we do not exit at this point. That situation
1726 can occur if we instantiate a template class, and then
1727 specialize one of its methods. This situation is valid, but
1728 the declarations must be merged in the usual way. */
1730 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
1731 && ((DECL_TEMPLATE_INSTANTIATION (olddecl
)
1732 && !DECL_USE_TEMPLATE (newdecl
))
1733 || (DECL_TEMPLATE_INSTANTIATION (newdecl
)
1734 && !DECL_USE_TEMPLATE (olddecl
))))
1735 /* One of the declarations is a template instantiation, and the
1736 other is not a template at all. That's OK. */
1738 else if (TREE_CODE (newdecl
) == NAMESPACE_DECL
)
1740 /* In [namespace.alias] we have:
1742 In a declarative region, a namespace-alias-definition can be
1743 used to redefine a namespace-alias declared in that declarative
1744 region to refer only to the namespace to which it already
1747 Therefore, if we encounter a second alias directive for the same
1748 alias, we can just ignore the second directive. */
1749 if (DECL_NAMESPACE_ALIAS (newdecl
)
1750 && (DECL_NAMESPACE_ALIAS (newdecl
)
1751 == DECL_NAMESPACE_ALIAS (olddecl
)))
1753 /* [namespace.alias]
1755 A namespace-name or namespace-alias shall not be declared as
1756 the name of any other entity in the same declarative region.
1757 A namespace-name defined at global scope shall not be
1758 declared as the name of any other entity in any global scope
1760 error ("conflicting declaration of namespace %q+D", newdecl
);
1761 inform (DECL_SOURCE_LOCATION (olddecl
),
1762 "previous declaration of namespace %qD here", olddecl
);
1763 return error_mark_node
;
1767 const char *errmsg
= redeclaration_error_message (newdecl
, olddecl
);
1770 error_at (DECL_SOURCE_LOCATION (newdecl
), errmsg
, newdecl
);
1771 if (DECL_NAME (olddecl
) != NULL_TREE
)
1772 inform (DECL_SOURCE_LOCATION (olddecl
),
1773 (DECL_INITIAL (olddecl
) && namespace_bindings_p ())
1774 ? G_("%q#D previously defined here")
1775 : G_("%q#D previously declared here"), olddecl
);
1776 return error_mark_node
;
1778 else if (TREE_CODE (olddecl
) == FUNCTION_DECL
1779 && DECL_INITIAL (olddecl
) != NULL_TREE
1780 && !prototype_p (TREE_TYPE (olddecl
))
1781 && prototype_p (TREE_TYPE (newdecl
)))
1783 /* Prototype decl follows defn w/o prototype. */
1784 if (warning_at (DECL_SOURCE_LOCATION (newdecl
), 0,
1785 "prototype specified for %q#D", newdecl
))
1786 inform (DECL_SOURCE_LOCATION (olddecl
),
1787 "previous non-prototype definition here");
1789 else if (VAR_OR_FUNCTION_DECL_P (olddecl
)
1790 && DECL_LANGUAGE (newdecl
) != DECL_LANGUAGE (olddecl
))
1793 If two declarations of the same function or object
1794 specify different linkage-specifications ..., the program
1795 is ill-formed.... Except for functions with C++ linkage,
1796 a function declaration without a linkage specification
1797 shall not precede the first linkage specification for
1798 that function. A function can be declared without a
1799 linkage specification after an explicit linkage
1800 specification has been seen; the linkage explicitly
1801 specified in the earlier declaration is not affected by
1802 such a function declaration.
1804 DR 563 raises the question why the restrictions on
1805 functions should not also apply to objects. Older
1806 versions of G++ silently ignore the linkage-specification
1814 which is clearly wrong. Therefore, we now treat objects
1816 if (current_lang_depth () == 0)
1818 /* There is no explicit linkage-specification, so we use
1819 the linkage from the previous declaration. */
1820 if (!DECL_LANG_SPECIFIC (newdecl
))
1821 retrofit_lang_decl (newdecl
);
1822 SET_DECL_LANGUAGE (newdecl
, DECL_LANGUAGE (olddecl
));
1826 error ("conflicting declaration of %q+#D with %qL linkage",
1827 newdecl
, DECL_LANGUAGE (newdecl
));
1828 inform (DECL_SOURCE_LOCATION (olddecl
),
1829 "previous declaration with %qL linkage",
1830 DECL_LANGUAGE (olddecl
));
1834 if (DECL_LANG_SPECIFIC (olddecl
) && DECL_USE_TEMPLATE (olddecl
))
1836 else if (TREE_CODE (olddecl
) == FUNCTION_DECL
)
1838 /* Note: free functions, as TEMPLATE_DECLs, are handled below. */
1839 if (DECL_FUNCTION_MEMBER_P (olddecl
)
1840 && (/* grokfndecl passes member function templates too
1841 as FUNCTION_DECLs. */
1842 DECL_TEMPLATE_INFO (olddecl
)
1844 Default arguments for a member function of a class
1845 template shall be specified on the initial declaration
1846 of the member function within the class template. */
1847 || CLASSTYPE_TEMPLATE_INFO (CP_DECL_CONTEXT (olddecl
))))
1848 check_redeclaration_no_default_args (newdecl
);
1851 tree t1
= FUNCTION_FIRST_USER_PARMTYPE (olddecl
);
1852 tree t2
= FUNCTION_FIRST_USER_PARMTYPE (newdecl
);
1855 for (; t1
&& t1
!= void_list_node
;
1856 t1
= TREE_CHAIN (t1
), t2
= TREE_CHAIN (t2
), i
++)
1857 if (TREE_PURPOSE (t1
) && TREE_PURPOSE (t2
))
1859 if (1 == simple_cst_equal (TREE_PURPOSE (t1
),
1862 if (permerror (input_location
,
1863 "default argument given for parameter "
1864 "%d of %q#D", i
, newdecl
))
1865 inform (DECL_SOURCE_LOCATION (olddecl
),
1866 "previous specification in %q#D here",
1871 error ("default argument given for parameter %d "
1872 "of %q#D", i
, newdecl
);
1873 inform (DECL_SOURCE_LOCATION (olddecl
),
1874 "previous specification in %q#D here",
1882 /* Do not merge an implicit typedef with an explicit one. In:
1886 typedef class A A __attribute__ ((foo));
1888 the attribute should apply only to the typedef. */
1889 if (TREE_CODE (olddecl
) == TYPE_DECL
1890 && (DECL_IMPLICIT_TYPEDEF_P (olddecl
)
1891 || DECL_IMPLICIT_TYPEDEF_P (newdecl
)))
1894 /* If new decl is `static' and an `extern' was seen previously,
1896 warn_extern_redeclared_static (newdecl
, olddecl
);
1898 if (!validate_constexpr_redeclaration (olddecl
, newdecl
))
1899 return error_mark_node
;
1901 /* We have committed to returning 1 at this point. */
1902 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1904 /* Now that functions must hold information normally held
1905 by field decls, there is extra work to do so that
1906 declaration information does not get destroyed during
1908 if (DECL_VINDEX (olddecl
))
1909 DECL_VINDEX (newdecl
) = DECL_VINDEX (olddecl
);
1910 if (DECL_CONTEXT (olddecl
))
1911 DECL_CONTEXT (newdecl
) = DECL_CONTEXT (olddecl
);
1912 DECL_STATIC_CONSTRUCTOR (newdecl
) |= DECL_STATIC_CONSTRUCTOR (olddecl
);
1913 DECL_STATIC_DESTRUCTOR (newdecl
) |= DECL_STATIC_DESTRUCTOR (olddecl
);
1914 DECL_PURE_VIRTUAL_P (newdecl
) |= DECL_PURE_VIRTUAL_P (olddecl
);
1915 DECL_VIRTUAL_P (newdecl
) |= DECL_VIRTUAL_P (olddecl
);
1916 DECL_INVALID_OVERRIDER_P (newdecl
) |= DECL_INVALID_OVERRIDER_P (olddecl
);
1917 DECL_FINAL_P (newdecl
) |= DECL_FINAL_P (olddecl
);
1918 DECL_OVERRIDE_P (newdecl
) |= DECL_OVERRIDE_P (olddecl
);
1919 DECL_THIS_STATIC (newdecl
) |= DECL_THIS_STATIC (olddecl
);
1920 if (DECL_OVERLOADED_OPERATOR_P (olddecl
) != ERROR_MARK
)
1921 SET_OVERLOADED_OPERATOR_CODE
1922 (newdecl
, DECL_OVERLOADED_OPERATOR_P (olddecl
));
1923 new_defines_function
= DECL_INITIAL (newdecl
) != NULL_TREE
;
1925 /* Optionally warn about more than one declaration for the same
1926 name, but don't warn about a function declaration followed by a
1928 if (warn_redundant_decls
&& ! DECL_ARTIFICIAL (olddecl
)
1929 && !(new_defines_function
&& DECL_INITIAL (olddecl
) == NULL_TREE
)
1930 /* Don't warn about extern decl followed by definition. */
1931 && !(DECL_EXTERNAL (olddecl
) && ! DECL_EXTERNAL (newdecl
))
1932 /* Don't warn about friends, let add_friend take care of it. */
1933 && ! (newdecl_is_friend
|| DECL_FRIEND_P (olddecl
))
1934 /* Don't warn about declaration followed by specialization. */
1935 && (! DECL_TEMPLATE_SPECIALIZATION (newdecl
)
1936 || DECL_TEMPLATE_SPECIALIZATION (olddecl
)))
1938 if (warning_at (DECL_SOURCE_LOCATION (newdecl
),
1939 OPT_Wredundant_decls
,
1940 "redundant redeclaration of %qD in same scope",
1942 inform (DECL_SOURCE_LOCATION (olddecl
),
1943 "previous declaration of %qD", olddecl
);
1946 if (!(DECL_TEMPLATE_INSTANTIATION (olddecl
)
1947 && DECL_TEMPLATE_SPECIALIZATION (newdecl
)))
1949 if (DECL_DELETED_FN (newdecl
))
1951 error ("deleted definition of %q+D", newdecl
);
1952 inform (DECL_SOURCE_LOCATION (olddecl
),
1953 "previous declaration of %qD", olddecl
);
1955 DECL_DELETED_FN (newdecl
) |= DECL_DELETED_FN (olddecl
);
1959 /* Deal with C++: must preserve virtual function table size. */
1960 if (TREE_CODE (olddecl
) == TYPE_DECL
)
1962 tree newtype
= TREE_TYPE (newdecl
);
1963 tree oldtype
= TREE_TYPE (olddecl
);
1965 if (newtype
!= error_mark_node
&& oldtype
!= error_mark_node
1966 && TYPE_LANG_SPECIFIC (newtype
) && TYPE_LANG_SPECIFIC (oldtype
))
1967 CLASSTYPE_FRIEND_CLASSES (newtype
)
1968 = CLASSTYPE_FRIEND_CLASSES (oldtype
);
1970 DECL_ORIGINAL_TYPE (newdecl
) = DECL_ORIGINAL_TYPE (olddecl
);
1973 /* Copy all the DECL_... slots specified in the new decl
1974 except for any that we copy here from the old type. */
1975 DECL_ATTRIBUTES (newdecl
)
1976 = (*targetm
.merge_decl_attributes
) (olddecl
, newdecl
);
1978 if (DECL_DECLARES_FUNCTION_P (olddecl
) && DECL_DECLARES_FUNCTION_P (newdecl
))
1980 olddecl_friend
= DECL_FRIEND_P (olddecl
);
1981 hidden_friend
= (DECL_ANTICIPATED (olddecl
)
1982 && DECL_HIDDEN_FRIEND_P (olddecl
)
1983 && newdecl_is_friend
);
1986 DECL_ANTICIPATED (olddecl
) = 0;
1987 DECL_HIDDEN_FRIEND_P (olddecl
) = 0;
1991 if (TREE_CODE (newdecl
) == TEMPLATE_DECL
)
1995 old_result
= DECL_TEMPLATE_RESULT (olddecl
);
1996 new_result
= DECL_TEMPLATE_RESULT (newdecl
);
1997 TREE_TYPE (olddecl
) = TREE_TYPE (old_result
);
1998 DECL_TEMPLATE_SPECIALIZATIONS (olddecl
)
1999 = chainon (DECL_TEMPLATE_SPECIALIZATIONS (olddecl
),
2000 DECL_TEMPLATE_SPECIALIZATIONS (newdecl
));
2002 DECL_ATTRIBUTES (old_result
)
2003 = (*targetm
.merge_decl_attributes
) (old_result
, new_result
);
2005 if (DECL_FUNCTION_TEMPLATE_P (newdecl
))
2007 /* Per C++11 8.3.6/4, default arguments cannot be added in later
2008 declarations of a function template. */
2009 if (DECL_SOURCE_LOCATION (newdecl
)
2010 != DECL_SOURCE_LOCATION (olddecl
))
2011 check_redeclaration_no_default_args (newdecl
);
2013 check_default_args (newdecl
);
2015 if (GNU_INLINE_P (old_result
) != GNU_INLINE_P (new_result
)
2016 && DECL_INITIAL (new_result
))
2018 if (DECL_INITIAL (old_result
))
2019 DECL_UNINLINABLE (old_result
) = 1;
2021 DECL_UNINLINABLE (old_result
) = DECL_UNINLINABLE (new_result
);
2022 DECL_EXTERNAL (old_result
) = DECL_EXTERNAL (new_result
);
2023 DECL_NOT_REALLY_EXTERN (old_result
)
2024 = DECL_NOT_REALLY_EXTERN (new_result
);
2025 DECL_INTERFACE_KNOWN (old_result
)
2026 = DECL_INTERFACE_KNOWN (new_result
);
2027 DECL_DECLARED_INLINE_P (old_result
)
2028 = DECL_DECLARED_INLINE_P (new_result
);
2029 DECL_DISREGARD_INLINE_LIMITS (old_result
)
2030 |= DECL_DISREGARD_INLINE_LIMITS (new_result
);
2035 DECL_DECLARED_INLINE_P (old_result
)
2036 |= DECL_DECLARED_INLINE_P (new_result
);
2037 DECL_DISREGARD_INLINE_LIMITS (old_result
)
2038 |= DECL_DISREGARD_INLINE_LIMITS (new_result
);
2039 check_redeclaration_exception_specification (newdecl
, olddecl
);
2043 /* If the new declaration is a definition, update the file and
2044 line information on the declaration, and also make
2045 the old declaration the same definition. */
2046 if (DECL_INITIAL (new_result
) != NULL_TREE
)
2048 DECL_SOURCE_LOCATION (olddecl
)
2049 = DECL_SOURCE_LOCATION (old_result
)
2050 = DECL_SOURCE_LOCATION (newdecl
);
2051 DECL_INITIAL (old_result
) = DECL_INITIAL (new_result
);
2052 if (DECL_FUNCTION_TEMPLATE_P (newdecl
))
2055 DECL_ARGUMENTS (old_result
)
2056 = DECL_ARGUMENTS (new_result
);
2057 for (parm
= DECL_ARGUMENTS (old_result
); parm
;
2058 parm
= DECL_CHAIN (parm
))
2059 DECL_CONTEXT (parm
) = old_result
;
2068 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2069 check_redeclaration_exception_specification (newdecl
, olddecl
);
2071 /* Automatically handles default parameters. */
2072 tree oldtype
= TREE_TYPE (olddecl
);
2075 /* For typedefs use the old type, as the new type's DECL_NAME points
2076 at newdecl, which will be ggc_freed. */
2077 if (TREE_CODE (newdecl
) == TYPE_DECL
)
2079 /* But NEWTYPE might have an attribute, honor that. */
2080 tree tem
= TREE_TYPE (newdecl
);
2083 if (TYPE_USER_ALIGN (tem
))
2085 if (TYPE_ALIGN (tem
) > TYPE_ALIGN (newtype
))
2086 SET_TYPE_ALIGN (newtype
, TYPE_ALIGN (tem
));
2087 TYPE_USER_ALIGN (newtype
) = true;
2090 /* And remove the new type from the variants list. */
2091 if (TYPE_NAME (TREE_TYPE (newdecl
)) == newdecl
)
2093 tree remove
= TREE_TYPE (newdecl
);
2094 for (tree t
= TYPE_MAIN_VARIANT (remove
); ;
2095 t
= TYPE_NEXT_VARIANT (t
))
2096 if (TYPE_NEXT_VARIANT (t
) == remove
)
2098 TYPE_NEXT_VARIANT (t
) = TYPE_NEXT_VARIANT (remove
);
2104 /* Merge the data types specified in the two decls. */
2105 newtype
= merge_types (TREE_TYPE (newdecl
), TREE_TYPE (olddecl
));
2107 if (VAR_P (newdecl
))
2109 DECL_THIS_EXTERN (newdecl
) |= DECL_THIS_EXTERN (olddecl
);
2110 /* For already initialized vars, TREE_READONLY could have been
2111 cleared in cp_finish_decl, because the var needs runtime
2112 initialization or destruction. Make sure not to set
2113 TREE_READONLY on it again. */
2114 if (DECL_INITIALIZED_P (olddecl
)
2115 && !DECL_EXTERNAL (olddecl
)
2116 && !TREE_READONLY (olddecl
))
2117 TREE_READONLY (newdecl
) = 0;
2118 DECL_INITIALIZED_P (newdecl
) |= DECL_INITIALIZED_P (olddecl
);
2119 DECL_NONTRIVIALLY_INITIALIZED_P (newdecl
)
2120 |= DECL_NONTRIVIALLY_INITIALIZED_P (olddecl
);
2121 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (newdecl
)
2122 |= DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (olddecl
);
2123 if (DECL_CLASS_SCOPE_P (olddecl
))
2124 DECL_DECLARED_CONSTEXPR_P (newdecl
)
2125 |= DECL_DECLARED_CONSTEXPR_P (olddecl
);
2127 /* Merge the threadprivate attribute from OLDDECL into NEWDECL. */
2128 if (DECL_LANG_SPECIFIC (olddecl
)
2129 && CP_DECL_THREADPRIVATE_P (olddecl
))
2131 /* Allocate a LANG_SPECIFIC structure for NEWDECL, if needed. */
2132 if (!DECL_LANG_SPECIFIC (newdecl
))
2133 retrofit_lang_decl (newdecl
);
2135 CP_DECL_THREADPRIVATE_P (newdecl
) = 1;
2139 /* An explicit specialization of a function template or of a member
2140 function of a class template can be declared transaction_safe
2141 independently of whether the corresponding template entity is declared
2142 transaction_safe. */
2143 if (flag_tm
&& TREE_CODE (newdecl
) == FUNCTION_DECL
2144 && DECL_TEMPLATE_INSTANTIATION (olddecl
)
2145 && DECL_TEMPLATE_SPECIALIZATION (newdecl
)
2146 && tx_safe_fn_type_p (newtype
)
2147 && !tx_safe_fn_type_p (TREE_TYPE (newdecl
)))
2148 newtype
= tx_unsafe_fn_variant (newtype
);
2150 TREE_TYPE (newdecl
) = TREE_TYPE (olddecl
) = newtype
;
2152 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2153 check_default_args (newdecl
);
2155 /* Lay the type out, unless already done. */
2156 if (! same_type_p (newtype
, oldtype
)
2157 && TREE_TYPE (newdecl
) != error_mark_node
2158 && !(processing_template_decl
&& uses_template_parms (newdecl
)))
2159 layout_type (TREE_TYPE (newdecl
));
2161 if ((VAR_P (newdecl
)
2162 || TREE_CODE (newdecl
) == PARM_DECL
2163 || TREE_CODE (newdecl
) == RESULT_DECL
2164 || TREE_CODE (newdecl
) == FIELD_DECL
2165 || TREE_CODE (newdecl
) == TYPE_DECL
)
2166 && !(processing_template_decl
&& uses_template_parms (newdecl
)))
2167 layout_decl (newdecl
, 0);
2169 /* Merge the type qualifiers. */
2170 if (TREE_READONLY (newdecl
))
2171 TREE_READONLY (olddecl
) = 1;
2172 if (TREE_THIS_VOLATILE (newdecl
))
2173 TREE_THIS_VOLATILE (olddecl
) = 1;
2174 if (TREE_NOTHROW (newdecl
))
2175 TREE_NOTHROW (olddecl
) = 1;
2177 /* Merge deprecatedness. */
2178 if (TREE_DEPRECATED (newdecl
))
2179 TREE_DEPRECATED (olddecl
) = 1;
2181 /* Preserve function specific target and optimization options */
2182 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2184 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl
)
2185 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl
))
2186 DECL_FUNCTION_SPECIFIC_TARGET (newdecl
)
2187 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl
);
2189 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl
)
2190 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl
))
2191 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl
)
2192 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl
);
2195 /* Merge the initialization information. */
2196 if (DECL_INITIAL (newdecl
) == NULL_TREE
2197 && DECL_INITIAL (olddecl
) != NULL_TREE
)
2199 DECL_INITIAL (newdecl
) = DECL_INITIAL (olddecl
);
2200 DECL_SOURCE_LOCATION (newdecl
) = DECL_SOURCE_LOCATION (olddecl
);
2201 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2203 DECL_SAVED_TREE (newdecl
) = DECL_SAVED_TREE (olddecl
);
2204 DECL_STRUCT_FUNCTION (newdecl
) = DECL_STRUCT_FUNCTION (olddecl
);
2208 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2210 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl
)
2211 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl
);
2212 DECL_NO_LIMIT_STACK (newdecl
) |= DECL_NO_LIMIT_STACK (olddecl
);
2213 TREE_THIS_VOLATILE (newdecl
) |= TREE_THIS_VOLATILE (olddecl
);
2214 TREE_NOTHROW (newdecl
) |= TREE_NOTHROW (olddecl
);
2215 DECL_IS_MALLOC (newdecl
) |= DECL_IS_MALLOC (olddecl
);
2216 DECL_IS_OPERATOR_NEW (newdecl
) |= DECL_IS_OPERATOR_NEW (olddecl
);
2217 DECL_PURE_P (newdecl
) |= DECL_PURE_P (olddecl
);
2218 TREE_READONLY (newdecl
) |= TREE_READONLY (olddecl
);
2219 DECL_LOOPING_CONST_OR_PURE_P (newdecl
)
2220 |= DECL_LOOPING_CONST_OR_PURE_P (olddecl
);
2221 /* Keep the old RTL. */
2222 COPY_DECL_RTL (olddecl
, newdecl
);
2224 else if (VAR_P (newdecl
)
2225 && (DECL_SIZE (olddecl
) || !DECL_SIZE (newdecl
)))
2227 /* Keep the old RTL. We cannot keep the old RTL if the old
2228 declaration was for an incomplete object and the new
2229 declaration is not since many attributes of the RTL will
2231 COPY_DECL_RTL (olddecl
, newdecl
);
2234 /* If cannot merge, then use the new type and qualifiers,
2235 and don't preserve the old rtl. */
2238 /* Clean out any memory we had of the old declaration. */
2239 tree oldstatic
= value_member (olddecl
, static_aggregates
);
2241 TREE_VALUE (oldstatic
) = error_mark_node
;
2243 TREE_TYPE (olddecl
) = TREE_TYPE (newdecl
);
2244 TREE_READONLY (olddecl
) = TREE_READONLY (newdecl
);
2245 TREE_THIS_VOLATILE (olddecl
) = TREE_THIS_VOLATILE (newdecl
);
2246 TREE_SIDE_EFFECTS (olddecl
) = TREE_SIDE_EFFECTS (newdecl
);
2249 /* Merge the storage class information. */
2250 merge_weak (newdecl
, olddecl
);
2252 DECL_DEFER_OUTPUT (newdecl
) |= DECL_DEFER_OUTPUT (olddecl
);
2253 TREE_PUBLIC (newdecl
) = TREE_PUBLIC (olddecl
);
2254 TREE_STATIC (olddecl
) = TREE_STATIC (newdecl
) |= TREE_STATIC (olddecl
);
2255 if (! DECL_EXTERNAL (olddecl
))
2256 DECL_EXTERNAL (newdecl
) = 0;
2257 if (! DECL_COMDAT (olddecl
))
2258 DECL_COMDAT (newdecl
) = 0;
2260 new_template_info
= NULL_TREE
;
2261 if (DECL_LANG_SPECIFIC (newdecl
) && DECL_LANG_SPECIFIC (olddecl
))
2263 bool new_redefines_gnu_inline
= false;
2265 if (new_defines_function
2266 && ((DECL_INTERFACE_KNOWN (olddecl
)
2267 && TREE_CODE (olddecl
) == FUNCTION_DECL
)
2268 || (TREE_CODE (olddecl
) == TEMPLATE_DECL
2269 && (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl
))
2270 == FUNCTION_DECL
))))
2274 if (TREE_CODE (fn
) == TEMPLATE_DECL
)
2275 fn
= DECL_TEMPLATE_RESULT (olddecl
);
2277 new_redefines_gnu_inline
= GNU_INLINE_P (fn
) && DECL_INITIAL (fn
);
2280 if (!new_redefines_gnu_inline
)
2282 DECL_INTERFACE_KNOWN (newdecl
) |= DECL_INTERFACE_KNOWN (olddecl
);
2283 DECL_NOT_REALLY_EXTERN (newdecl
) |= DECL_NOT_REALLY_EXTERN (olddecl
);
2284 DECL_COMDAT (newdecl
) |= DECL_COMDAT (olddecl
);
2286 DECL_TEMPLATE_INSTANTIATED (newdecl
)
2287 |= DECL_TEMPLATE_INSTANTIATED (olddecl
);
2288 DECL_ODR_USED (newdecl
) |= DECL_ODR_USED (olddecl
);
2290 /* If the OLDDECL is an instantiation and/or specialization,
2291 then the NEWDECL must be too. But, it may not yet be marked
2292 as such if the caller has created NEWDECL, but has not yet
2293 figured out that it is a redeclaration. */
2294 if (!DECL_USE_TEMPLATE (newdecl
))
2295 DECL_USE_TEMPLATE (newdecl
) = DECL_USE_TEMPLATE (olddecl
);
2297 /* Don't really know how much of the language-specific
2298 values we should copy from old to new. */
2299 DECL_IN_AGGR_P (newdecl
) = DECL_IN_AGGR_P (olddecl
);
2300 DECL_REPO_AVAILABLE_P (newdecl
) = DECL_REPO_AVAILABLE_P (olddecl
);
2301 DECL_INITIALIZED_IN_CLASS_P (newdecl
)
2302 |= DECL_INITIALIZED_IN_CLASS_P (olddecl
);
2304 if (LANG_DECL_HAS_MIN (newdecl
))
2306 DECL_LANG_SPECIFIC (newdecl
)->u
.min
.u2
=
2307 DECL_LANG_SPECIFIC (olddecl
)->u
.min
.u2
;
2308 if (DECL_TEMPLATE_INFO (newdecl
))
2310 new_template_info
= DECL_TEMPLATE_INFO (newdecl
);
2311 if (DECL_TEMPLATE_INSTANTIATION (olddecl
)
2312 && DECL_TEMPLATE_SPECIALIZATION (newdecl
))
2313 /* Remember the presence of explicit specialization args. */
2314 TINFO_USED_TEMPLATE_ID (DECL_TEMPLATE_INFO (olddecl
))
2315 = TINFO_USED_TEMPLATE_ID (new_template_info
);
2317 DECL_TEMPLATE_INFO (newdecl
) = DECL_TEMPLATE_INFO (olddecl
);
2319 /* Only functions have these fields. */
2320 if (DECL_DECLARES_FUNCTION_P (newdecl
))
2322 DECL_NONCONVERTING_P (newdecl
) = DECL_NONCONVERTING_P (olddecl
);
2323 DECL_BEFRIENDING_CLASSES (newdecl
)
2324 = chainon (DECL_BEFRIENDING_CLASSES (newdecl
),
2325 DECL_BEFRIENDING_CLASSES (olddecl
));
2326 /* DECL_THUNKS is only valid for virtual functions,
2327 otherwise it is a DECL_FRIEND_CONTEXT. */
2328 if (DECL_VIRTUAL_P (newdecl
))
2329 SET_DECL_THUNKS (newdecl
, DECL_THUNKS (olddecl
));
2331 /* Only variables have this field. */
2332 else if (VAR_P (newdecl
)
2333 && VAR_HAD_UNKNOWN_BOUND (olddecl
))
2334 SET_VAR_HAD_UNKNOWN_BOUND (newdecl
);
2337 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2341 /* Merge parameter attributes. */
2342 tree oldarg
, newarg
;
2343 for (oldarg
= DECL_ARGUMENTS(olddecl
),
2344 newarg
= DECL_ARGUMENTS(newdecl
);
2346 oldarg
= DECL_CHAIN(oldarg
), newarg
= DECL_CHAIN(newarg
)) {
2347 DECL_ATTRIBUTES (newarg
)
2348 = (*targetm
.merge_decl_attributes
) (oldarg
, newarg
);
2349 DECL_ATTRIBUTES (oldarg
) = DECL_ATTRIBUTES (newarg
);
2352 if (DECL_TEMPLATE_INSTANTIATION (olddecl
)
2353 && !DECL_TEMPLATE_INSTANTIATION (newdecl
))
2355 /* If newdecl is not a specialization, then it is not a
2356 template-related function at all. And that means that we
2357 should have exited above, returning 0. */
2358 gcc_assert (DECL_TEMPLATE_SPECIALIZATION (newdecl
));
2360 if (DECL_ODR_USED (olddecl
))
2361 /* From [temp.expl.spec]:
2363 If a template, a member template or the member of a class
2364 template is explicitly specialized then that
2365 specialization shall be declared before the first use of
2366 that specialization that would cause an implicit
2367 instantiation to take place, in every translation unit in
2368 which such a use occurs. */
2369 error ("explicit specialization of %qD after first use",
2372 SET_DECL_TEMPLATE_SPECIALIZATION (olddecl
);
2373 DECL_COMDAT (newdecl
) = (TREE_PUBLIC (newdecl
)
2374 && DECL_DECLARED_INLINE_P (newdecl
));
2376 /* Don't propagate visibility from the template to the
2377 specialization here. We'll do that in determine_visibility if
2379 DECL_VISIBILITY_SPECIFIED (olddecl
) = 0;
2381 /* [temp.expl.spec/14] We don't inline explicit specialization
2382 just because the primary template says so. */
2384 /* But still keep DECL_DISREGARD_INLINE_LIMITS in sync with
2385 the always_inline attribute. */
2386 if (DECL_DISREGARD_INLINE_LIMITS (olddecl
)
2387 && !DECL_DISREGARD_INLINE_LIMITS (newdecl
))
2389 if (DECL_DECLARED_INLINE_P (newdecl
))
2390 DECL_DISREGARD_INLINE_LIMITS (newdecl
) = true;
2392 DECL_ATTRIBUTES (newdecl
)
2393 = remove_attribute ("always_inline",
2394 DECL_ATTRIBUTES (newdecl
));
2397 else if (new_defines_function
&& DECL_INITIAL (olddecl
))
2399 /* Never inline re-defined extern inline functions.
2400 FIXME: this could be better handled by keeping both
2401 function as separate declarations. */
2402 DECL_UNINLINABLE (newdecl
) = 1;
2406 if (DECL_PENDING_INLINE_P (olddecl
))
2408 DECL_PENDING_INLINE_P (newdecl
) = 1;
2409 DECL_PENDING_INLINE_INFO (newdecl
)
2410 = DECL_PENDING_INLINE_INFO (olddecl
);
2412 else if (DECL_PENDING_INLINE_P (newdecl
))
2414 else if (DECL_SAVED_FUNCTION_DATA (newdecl
) == NULL
)
2415 DECL_SAVED_FUNCTION_DATA (newdecl
)
2416 = DECL_SAVED_FUNCTION_DATA (olddecl
);
2418 DECL_DECLARED_INLINE_P (newdecl
) |= DECL_DECLARED_INLINE_P (olddecl
);
2420 DECL_UNINLINABLE (newdecl
) = DECL_UNINLINABLE (olddecl
)
2421 = (DECL_UNINLINABLE (newdecl
) || DECL_UNINLINABLE (olddecl
));
2423 DECL_DISREGARD_INLINE_LIMITS (newdecl
)
2424 = DECL_DISREGARD_INLINE_LIMITS (olddecl
)
2425 = (DECL_DISREGARD_INLINE_LIMITS (newdecl
)
2426 || DECL_DISREGARD_INLINE_LIMITS (olddecl
));
2429 /* Preserve abstractness on cloned [cd]tors. */
2430 DECL_ABSTRACT_P (newdecl
) = DECL_ABSTRACT_P (olddecl
);
2432 /* Update newdecl's parms to point at olddecl. */
2433 for (parm
= DECL_ARGUMENTS (newdecl
); parm
;
2434 parm
= DECL_CHAIN (parm
))
2435 DECL_CONTEXT (parm
) = olddecl
;
2439 SET_DECL_LANGUAGE (olddecl
, DECL_LANGUAGE (newdecl
));
2440 COPY_DECL_ASSEMBLER_NAME (newdecl
, olddecl
);
2441 COPY_DECL_RTL (newdecl
, olddecl
);
2443 if (! types_match
|| new_defines_function
)
2445 /* These need to be copied so that the names are available.
2446 Note that if the types do match, we'll preserve inline
2447 info and other bits, but if not, we won't. */
2448 DECL_ARGUMENTS (olddecl
) = DECL_ARGUMENTS (newdecl
);
2449 DECL_RESULT (olddecl
) = DECL_RESULT (newdecl
);
2451 /* If redeclaring a builtin function, it stays built in
2452 if newdecl is a gnu_inline definition, or if newdecl is just
2454 if (DECL_BUILT_IN (olddecl
)
2455 && (new_defines_function
? GNU_INLINE_P (newdecl
) : types_match
))
2457 DECL_BUILT_IN_CLASS (newdecl
) = DECL_BUILT_IN_CLASS (olddecl
);
2458 DECL_FUNCTION_CODE (newdecl
) = DECL_FUNCTION_CODE (olddecl
);
2459 /* If we're keeping the built-in definition, keep the rtl,
2460 regardless of declaration matches. */
2461 COPY_DECL_RTL (olddecl
, newdecl
);
2462 if (DECL_BUILT_IN_CLASS (newdecl
) == BUILT_IN_NORMAL
)
2464 enum built_in_function fncode
= DECL_FUNCTION_CODE (newdecl
);
2467 /* If a compatible prototype of these builtin functions
2468 is seen, assume the runtime implements it with the
2469 expected semantics. */
2470 case BUILT_IN_STPCPY
:
2471 if (builtin_decl_explicit_p (fncode
))
2472 set_builtin_decl_implicit_p (fncode
, true);
2475 if (builtin_decl_explicit_p (fncode
))
2476 set_builtin_decl_declared_p (fncode
, true);
2481 if (new_defines_function
)
2482 /* If defining a function declared with other language
2483 linkage, use the previously declared language linkage. */
2484 SET_DECL_LANGUAGE (newdecl
, DECL_LANGUAGE (olddecl
));
2485 else if (types_match
)
2487 DECL_RESULT (newdecl
) = DECL_RESULT (olddecl
);
2488 /* Don't clear out the arguments if we're just redeclaring a
2490 if (DECL_ARGUMENTS (olddecl
))
2491 DECL_ARGUMENTS (newdecl
) = DECL_ARGUMENTS (olddecl
);
2494 else if (TREE_CODE (newdecl
) == NAMESPACE_DECL
)
2495 NAMESPACE_LEVEL (newdecl
) = NAMESPACE_LEVEL (olddecl
);
2497 /* Now preserve various other info from the definition. */
2498 TREE_ADDRESSABLE (newdecl
) = TREE_ADDRESSABLE (olddecl
);
2499 TREE_ASM_WRITTEN (newdecl
) = TREE_ASM_WRITTEN (olddecl
);
2500 DECL_COMMON (newdecl
) = DECL_COMMON (olddecl
);
2501 COPY_DECL_ASSEMBLER_NAME (olddecl
, newdecl
);
2503 /* Warn about conflicting visibility specifications. */
2504 if (DECL_VISIBILITY_SPECIFIED (olddecl
)
2505 && DECL_VISIBILITY_SPECIFIED (newdecl
)
2506 && DECL_VISIBILITY (newdecl
) != DECL_VISIBILITY (olddecl
))
2508 if (warning_at (DECL_SOURCE_LOCATION (newdecl
), OPT_Wattributes
,
2509 "%qD: visibility attribute ignored because it "
2510 "conflicts with previous declaration", newdecl
))
2511 inform (DECL_SOURCE_LOCATION (olddecl
),
2512 "previous declaration of %qD", olddecl
);
2514 /* Choose the declaration which specified visibility. */
2515 if (DECL_VISIBILITY_SPECIFIED (olddecl
))
2517 DECL_VISIBILITY (newdecl
) = DECL_VISIBILITY (olddecl
);
2518 DECL_VISIBILITY_SPECIFIED (newdecl
) = 1;
2520 /* Init priority used to be merged from newdecl to olddecl by the memcpy,
2521 so keep this behavior. */
2522 if (VAR_P (newdecl
) && DECL_HAS_INIT_PRIORITY_P (newdecl
))
2524 SET_DECL_INIT_PRIORITY (olddecl
, DECL_INIT_PRIORITY (newdecl
));
2525 DECL_HAS_INIT_PRIORITY_P (olddecl
) = 1;
2527 /* Likewise for DECL_ALIGN, DECL_USER_ALIGN and DECL_PACKED. */
2528 if (DECL_ALIGN (olddecl
) > DECL_ALIGN (newdecl
))
2530 SET_DECL_ALIGN (newdecl
, DECL_ALIGN (olddecl
));
2531 DECL_USER_ALIGN (newdecl
) |= DECL_USER_ALIGN (olddecl
);
2533 DECL_USER_ALIGN (olddecl
) = DECL_USER_ALIGN (newdecl
);
2534 if (TREE_CODE (newdecl
) == FIELD_DECL
)
2535 DECL_PACKED (olddecl
) = DECL_PACKED (newdecl
);
2537 /* The DECL_LANG_SPECIFIC information in OLDDECL will be replaced
2538 with that from NEWDECL below. */
2539 if (DECL_LANG_SPECIFIC (olddecl
))
2541 gcc_assert (DECL_LANG_SPECIFIC (olddecl
)
2542 != DECL_LANG_SPECIFIC (newdecl
));
2543 ggc_free (DECL_LANG_SPECIFIC (olddecl
));
2546 /* Merge the USED information. */
2547 if (TREE_USED (olddecl
))
2548 TREE_USED (newdecl
) = 1;
2549 else if (TREE_USED (newdecl
))
2550 TREE_USED (olddecl
) = 1;
2551 if (VAR_P (newdecl
))
2553 if (DECL_READ_P (olddecl
))
2554 DECL_READ_P (newdecl
) = 1;
2555 else if (DECL_READ_P (newdecl
))
2556 DECL_READ_P (olddecl
) = 1;
2558 if (DECL_PRESERVE_P (olddecl
))
2559 DECL_PRESERVE_P (newdecl
) = 1;
2560 else if (DECL_PRESERVE_P (newdecl
))
2561 DECL_PRESERVE_P (olddecl
) = 1;
2563 /* Merge the DECL_FUNCTION_VERSIONED information. newdecl will be copied
2564 to olddecl and deleted. */
2565 if (TREE_CODE (newdecl
) == FUNCTION_DECL
2566 && DECL_FUNCTION_VERSIONED (olddecl
))
2568 /* Set the flag for newdecl so that it gets copied to olddecl. */
2569 DECL_FUNCTION_VERSIONED (newdecl
) = 1;
2570 /* newdecl will be purged after copying to olddecl and is no longer
2572 cgraph_node::delete_function_version (newdecl
);
2575 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2578 struct symtab_node
*snode
= symtab_node::get (olddecl
);
2580 function_size
= sizeof (struct tree_decl_common
);
2582 memcpy ((char *) olddecl
+ sizeof (struct tree_common
),
2583 (char *) newdecl
+ sizeof (struct tree_common
),
2584 function_size
- sizeof (struct tree_common
));
2586 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
2587 (char *) newdecl
+ sizeof (struct tree_decl_common
),
2588 sizeof (struct tree_function_decl
) - sizeof (struct tree_decl_common
));
2590 /* Preserve symtab node mapping. */
2591 olddecl
->decl_with_vis
.symtab_node
= snode
;
2593 if (new_template_info
)
2594 /* If newdecl is a template instantiation, it is possible that
2595 the following sequence of events has occurred:
2597 o A friend function was declared in a class template. The
2598 class template was instantiated.
2600 o The instantiation of the friend declaration was
2601 recorded on the instantiation list, and is newdecl.
2603 o Later, however, instantiate_class_template called pushdecl
2604 on the newdecl to perform name injection. But, pushdecl in
2605 turn called duplicate_decls when it discovered that another
2606 declaration of a global function with the same name already
2609 o Here, in duplicate_decls, we decided to clobber newdecl.
2611 If we're going to do that, we'd better make sure that
2612 olddecl, and not newdecl, is on the list of
2613 instantiations so that if we try to do the instantiation
2614 again we won't get the clobbered declaration. */
2615 reregister_specialization (newdecl
,
2621 size_t size
= tree_code_size (TREE_CODE (newdecl
));
2623 memcpy ((char *) olddecl
+ sizeof (struct tree_common
),
2624 (char *) newdecl
+ sizeof (struct tree_common
),
2625 sizeof (struct tree_decl_common
) - sizeof (struct tree_common
));
2626 switch (TREE_CODE (newdecl
))
2636 struct symtab_node
*snode
= NULL
;
2639 && (TREE_STATIC (olddecl
) || TREE_PUBLIC (olddecl
)
2640 || DECL_EXTERNAL (olddecl
)))
2641 snode
= symtab_node::get (olddecl
);
2642 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
2643 (char *) newdecl
+ sizeof (struct tree_decl_common
),
2644 size
- sizeof (struct tree_decl_common
)
2645 + TREE_CODE_LENGTH (TREE_CODE (newdecl
)) * sizeof (char *));
2646 if (VAR_P (newdecl
))
2647 olddecl
->decl_with_vis
.symtab_node
= snode
;
2651 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
2652 (char *) newdecl
+ sizeof (struct tree_decl_common
),
2653 sizeof (struct tree_decl_non_common
) - sizeof (struct tree_decl_common
)
2654 + TREE_CODE_LENGTH (TREE_CODE (newdecl
)) * sizeof (char *));
2659 if (VAR_OR_FUNCTION_DECL_P (newdecl
))
2661 if (DECL_EXTERNAL (olddecl
)
2662 || TREE_PUBLIC (olddecl
)
2663 || TREE_STATIC (olddecl
))
2665 /* Merge the section attribute.
2666 We want to issue an error if the sections conflict but that must be
2667 done later in decl_attributes since we are called before attributes
2669 if (DECL_SECTION_NAME (newdecl
) != NULL
)
2670 set_decl_section_name (olddecl
, DECL_SECTION_NAME (newdecl
));
2672 if (DECL_ONE_ONLY (newdecl
))
2674 struct symtab_node
*oldsym
, *newsym
;
2675 if (TREE_CODE (olddecl
) == FUNCTION_DECL
)
2676 oldsym
= cgraph_node::get_create (olddecl
);
2678 oldsym
= varpool_node::get_create (olddecl
);
2679 newsym
= symtab_node::get (newdecl
);
2680 oldsym
->set_comdat_group (newsym
->get_comdat_group ());
2685 && CP_DECL_THREAD_LOCAL_P (newdecl
))
2687 CP_DECL_THREAD_LOCAL_P (olddecl
) = true;
2688 if (!processing_template_decl
)
2689 set_decl_tls_model (olddecl
, DECL_TLS_MODEL (newdecl
));
2693 DECL_UID (olddecl
) = olddecl_uid
;
2695 DECL_FRIEND_P (olddecl
) = 1;
2698 DECL_ANTICIPATED (olddecl
) = 1;
2699 DECL_HIDDEN_FRIEND_P (olddecl
) = 1;
2702 /* NEWDECL contains the merged attribute lists.
2703 Update OLDDECL to be the same. */
2704 DECL_ATTRIBUTES (olddecl
) = DECL_ATTRIBUTES (newdecl
);
2706 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2707 so that encode_section_info has a chance to look at the new decl
2708 flags and attributes. */
2709 if (DECL_RTL_SET_P (olddecl
)
2710 && (TREE_CODE (olddecl
) == FUNCTION_DECL
2712 && TREE_STATIC (olddecl
))))
2713 make_decl_rtl (olddecl
);
2715 /* The NEWDECL will no longer be needed. Because every out-of-class
2716 declaration of a member results in a call to duplicate_decls,
2717 freeing these nodes represents in a significant savings.
2719 Before releasing the node, be sore to remove function from symbol
2720 table that might have been inserted there to record comdat group.
2721 Be sure to however do not free DECL_STRUCT_FUNCTION because this
2722 structure is shared in between newdecl and oldecl. */
2723 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2724 DECL_STRUCT_FUNCTION (newdecl
) = NULL
;
2725 if (VAR_OR_FUNCTION_DECL_P (newdecl
))
2727 struct symtab_node
*snode
= symtab_node::get (newdecl
);
2732 /* Remove the associated constraints for newdecl, if any, before
2733 reclaiming memory. */
2735 remove_constraints (newdecl
);
2742 /* Return zero if the declaration NEWDECL is valid
2743 when the declaration OLDDECL (assumed to be for the same name)
2744 has already been seen.
2745 Otherwise return an error message format string with a %s
2746 where the identifier should go. */
2749 redeclaration_error_message (tree newdecl
, tree olddecl
)
2751 if (TREE_CODE (newdecl
) == TYPE_DECL
)
2753 /* Because C++ can put things into name space for free,
2754 constructs like "typedef struct foo { ... } foo"
2755 would look like an erroneous redeclaration. */
2756 if (same_type_p (TREE_TYPE (newdecl
), TREE_TYPE (olddecl
)))
2759 return G_("redefinition of %q#D");
2761 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2763 /* If this is a pure function, its olddecl will actually be
2764 the original initialization to `0' (which we force to call
2765 abort()). Don't complain about redefinition in this case. */
2766 if (DECL_LANG_SPECIFIC (olddecl
) && DECL_PURE_VIRTUAL_P (olddecl
)
2767 && DECL_INITIAL (olddecl
) == NULL_TREE
)
2770 /* If both functions come from different namespaces, this is not
2771 a redeclaration - this is a conflict with a used function. */
2772 if (DECL_NAMESPACE_SCOPE_P (olddecl
)
2773 && DECL_CONTEXT (olddecl
) != DECL_CONTEXT (newdecl
)
2774 && ! decls_match (olddecl
, newdecl
))
2775 return G_("%qD conflicts with used function");
2777 /* We'll complain about linkage mismatches in
2778 warn_extern_redeclared_static. */
2780 /* Defining the same name twice is no good. */
2781 if (decl_defined_p (olddecl
)
2782 && decl_defined_p (newdecl
))
2784 if (DECL_NAME (olddecl
) == NULL_TREE
)
2785 return G_("%q#D not declared in class");
2786 else if (!GNU_INLINE_P (olddecl
)
2787 || GNU_INLINE_P (newdecl
))
2788 return G_("redefinition of %q#D");
2791 if (DECL_DECLARED_INLINE_P (olddecl
) && DECL_DECLARED_INLINE_P (newdecl
))
2793 bool olda
= GNU_INLINE_P (olddecl
);
2794 bool newa
= GNU_INLINE_P (newdecl
);
2799 return G_("%q+D redeclared inline with "
2800 "%<gnu_inline%> attribute");
2802 return G_("%q+D redeclared inline without "
2803 "%<gnu_inline%> attribute");
2807 check_abi_tag_redeclaration
2808 (olddecl
, lookup_attribute ("abi_tag", DECL_ATTRIBUTES (olddecl
)),
2809 lookup_attribute ("abi_tag", DECL_ATTRIBUTES (newdecl
)));
2813 else if (TREE_CODE (newdecl
) == TEMPLATE_DECL
)
2817 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl
)) == TYPE_DECL
)
2819 if (COMPLETE_TYPE_P (TREE_TYPE (newdecl
))
2820 && COMPLETE_TYPE_P (TREE_TYPE (olddecl
)))
2821 return G_("redefinition of %q#D");
2825 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl
)) != FUNCTION_DECL
2826 || (DECL_TEMPLATE_RESULT (newdecl
)
2827 == DECL_TEMPLATE_RESULT (olddecl
)))
2830 nt
= DECL_TEMPLATE_RESULT (newdecl
);
2831 if (DECL_TEMPLATE_INFO (nt
))
2832 nt
= DECL_TEMPLATE_RESULT (template_for_substitution (nt
));
2833 ot
= DECL_TEMPLATE_RESULT (olddecl
);
2834 if (DECL_TEMPLATE_INFO (ot
))
2835 ot
= DECL_TEMPLATE_RESULT (template_for_substitution (ot
));
2836 if (DECL_INITIAL (nt
) && DECL_INITIAL (ot
)
2837 && (!GNU_INLINE_P (ot
) || GNU_INLINE_P (nt
)))
2838 return G_("redefinition of %q#D");
2840 if (DECL_DECLARED_INLINE_P (ot
) && DECL_DECLARED_INLINE_P (nt
))
2842 bool olda
= GNU_INLINE_P (ot
);
2843 bool newa
= GNU_INLINE_P (nt
);
2848 return G_("%q+D redeclared inline with "
2849 "%<gnu_inline%> attribute");
2851 return G_("%q+D redeclared inline without "
2852 "%<gnu_inline%> attribute");
2856 /* Core issue #226 (C++0x):
2858 If a friend function template declaration specifies a
2859 default template-argument, that declaration shall be a
2860 definition and shall be the only declaration of the
2861 function template in the translation unit. */
2862 if ((cxx_dialect
!= cxx98
)
2863 && TREE_CODE (ot
) == FUNCTION_DECL
&& DECL_FRIEND_P (ot
)
2864 && !check_default_tmpl_args (nt
, DECL_TEMPLATE_PARMS (newdecl
),
2865 /*is_primary=*/true,
2866 /*is_partial=*/false,
2867 /*is_friend_decl=*/2))
2868 return G_("redeclaration of friend %q#D "
2869 "may not have default template arguments");
2873 else if (VAR_P (newdecl
)
2874 && CP_DECL_THREAD_LOCAL_P (newdecl
) != CP_DECL_THREAD_LOCAL_P (olddecl
)
2875 && (! DECL_LANG_SPECIFIC (olddecl
)
2876 || ! CP_DECL_THREADPRIVATE_P (olddecl
)
2877 || CP_DECL_THREAD_LOCAL_P (newdecl
)))
2879 /* Only variables can be thread-local, and all declarations must
2880 agree on this property. */
2881 if (CP_DECL_THREAD_LOCAL_P (newdecl
))
2882 return G_("thread-local declaration of %q#D follows "
2883 "non-thread-local declaration");
2885 return G_("non-thread-local declaration of %q#D follows "
2886 "thread-local declaration");
2888 else if (toplevel_bindings_p () || DECL_NAMESPACE_SCOPE_P (newdecl
))
2890 /* The objects have been declared at namespace scope. If either
2891 is a member of an anonymous union, then this is an invalid
2892 redeclaration. For example:
2898 if ((VAR_P (newdecl
) && DECL_ANON_UNION_VAR_P (newdecl
))
2899 || (VAR_P (olddecl
) && DECL_ANON_UNION_VAR_P (olddecl
)))
2900 return G_("redeclaration of %q#D");
2901 /* If at least one declaration is a reference, there is no
2902 conflict. For example:
2908 if (DECL_EXTERNAL (newdecl
) || DECL_EXTERNAL (olddecl
))
2911 /* Static data member declared outside a class definition
2912 if the variable is defined within the class with constexpr
2913 specifier is declaration rather than definition (and
2915 if (cxx_dialect
>= cxx1z
2916 && DECL_CLASS_SCOPE_P (olddecl
)
2917 && DECL_DECLARED_CONSTEXPR_P (olddecl
)
2918 && !DECL_INITIAL (newdecl
))
2920 DECL_EXTERNAL (newdecl
) = 1;
2921 /* For now, only warn with explicit -Wdeprecated. */
2922 if (global_options_set
.x_warn_deprecated
2923 && warning_at (DECL_SOURCE_LOCATION (newdecl
), OPT_Wdeprecated
,
2924 "redundant redeclaration of %<constexpr%> static "
2925 "data member %qD", newdecl
))
2926 inform (DECL_SOURCE_LOCATION (olddecl
),
2927 "previous declaration of %qD", olddecl
);
2931 /* Reject two definitions. */
2932 return G_("redefinition of %q#D");
2936 /* Objects declared with block scope: */
2937 /* Reject two definitions, and reject a definition
2938 together with an external reference. */
2939 if (!(DECL_EXTERNAL (newdecl
) && DECL_EXTERNAL (olddecl
)))
2940 return G_("redeclaration of %q#D");
2945 /* Hash and equality functions for the named_label table. */
2948 named_label_hasher::hash (named_label_entry
*ent
)
2950 return DECL_UID (ent
->label_decl
);
2954 named_label_hasher::equal (named_label_entry
*a
, named_label_entry
*b
)
2956 return a
->label_decl
== b
->label_decl
;
2959 /* Create a new label, named ID. */
2962 make_label_decl (tree id
, int local_p
)
2964 struct named_label_entry
*ent
;
2967 decl
= build_decl (input_location
, LABEL_DECL
, id
, void_type_node
);
2969 DECL_CONTEXT (decl
) = current_function_decl
;
2970 DECL_MODE (decl
) = VOIDmode
;
2971 C_DECLARED_LABEL_FLAG (decl
) = local_p
;
2973 /* Say where one reference is to the label, for the sake of the
2974 error if it is not defined. */
2975 DECL_SOURCE_LOCATION (decl
) = input_location
;
2977 /* Record the fact that this identifier is bound to this label. */
2978 SET_IDENTIFIER_LABEL_VALUE (id
, decl
);
2980 /* Create the label htab for the function on demand. */
2982 named_labels
= hash_table
<named_label_hasher
>::create_ggc (13);
2984 /* Record this label on the list of labels used in this function.
2985 We do this before calling make_label_decl so that we get the
2986 IDENTIFIER_LABEL_VALUE before the new label is declared. */
2987 ent
= ggc_cleared_alloc
<named_label_entry
> ();
2988 ent
->label_decl
= decl
;
2990 named_label_entry
**slot
= named_labels
->find_slot (ent
, INSERT
);
2991 gcc_assert (*slot
== NULL
);
2997 /* Look for a label named ID in the current function. If one cannot
2998 be found, create one. (We keep track of used, but undefined,
2999 labels, and complain about them at the end of a function.) */
3002 lookup_label_1 (tree id
)
3006 /* You can't use labels at global scope. */
3007 if (current_function_decl
== NULL_TREE
)
3009 error ("label %qE referenced outside of any function", id
);
3013 /* See if we've already got this label. */
3014 decl
= IDENTIFIER_LABEL_VALUE (id
);
3015 if (decl
!= NULL_TREE
&& DECL_CONTEXT (decl
) == current_function_decl
)
3018 decl
= make_label_decl (id
, /*local_p=*/0);
3022 /* Wrapper for lookup_label_1. */
3025 lookup_label (tree id
)
3028 bool subtime
= timevar_cond_start (TV_NAME_LOOKUP
);
3029 ret
= lookup_label_1 (id
);
3030 timevar_cond_stop (TV_NAME_LOOKUP
, subtime
);
3034 /* Declare a local label named ID. */
3037 declare_local_label (tree id
)
3040 cp_label_binding bind
;
3042 /* Add a new entry to the SHADOWED_LABELS list so that when we leave
3043 this scope we can restore the old value of IDENTIFIER_TYPE_VALUE. */
3044 bind
.prev_value
= IDENTIFIER_LABEL_VALUE (id
);
3046 decl
= make_label_decl (id
, /*local_p=*/1);
3048 vec_safe_push (current_binding_level
->shadowed_labels
, bind
);
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 = (decl
? emit_diagnostic (diag_kind
, loc
, 0, "jump to label %qD", decl
)
3090 : emit_diagnostic (diag_kind
, loc
, 0, "jump to case label"));
3091 if (complained
&& locus
)
3092 inform (*locus
, " from here");
3096 /* Check that a single previously seen jump to a newly defined label
3097 is OK. DECL is the LABEL_DECL or 0; LEVEL is the binding_level for
3098 the jump context; NAMES are the names in scope in LEVEL at the jump
3099 context; LOCUS is the source position of the jump or 0. Returns
3100 true if all is well. */
3103 check_previous_goto_1 (tree decl
, cp_binding_level
* level
, tree names
,
3104 bool exited_omp
, const location_t
*locus
)
3106 cp_binding_level
*b
;
3107 bool complained
= false;
3109 bool saw_eh
= false, saw_omp
= false, saw_tm
= false, saw_cxif
= false;
3113 complained
= identify_goto (decl
, input_location
, locus
, DK_ERROR
);
3115 inform (input_location
, " exits OpenMP structured block");
3120 for (b
= current_binding_level
; b
; b
= b
->level_chain
)
3122 tree new_decls
, old_decls
= (b
== level
? names
: NULL_TREE
);
3124 for (new_decls
= b
->names
; new_decls
!= old_decls
;
3125 new_decls
= (DECL_P (new_decls
) ? DECL_CHAIN (new_decls
)
3126 : TREE_CHAIN (new_decls
)))
3128 int problem
= decl_jump_unsafe (new_decls
);
3134 complained
= identify_goto (decl
, input_location
, locus
,
3141 inform (DECL_SOURCE_LOCATION (new_decls
),
3142 " crosses initialization of %q#D", new_decls
);
3144 inform (DECL_SOURCE_LOCATION (new_decls
),
3145 " enters scope of %q#D which has "
3146 "non-trivial destructor", new_decls
);
3152 if ((b
->kind
== sk_try
|| b
->kind
== sk_catch
) && !saw_eh
)
3156 complained
= identify_goto (decl
, input_location
, locus
,
3162 if (b
->kind
== sk_try
)
3163 inform (input_location
, " enters try block");
3165 inform (input_location
, " enters catch block");
3169 if (b
->kind
== sk_omp
&& !saw_omp
)
3173 complained
= identify_goto (decl
, input_location
, locus
,
3178 inform (input_location
, " enters OpenMP structured block");
3181 if (b
->kind
== sk_transaction
&& !saw_tm
)
3185 complained
= identify_goto (decl
, input_location
, locus
,
3190 inform (input_location
,
3191 " enters synchronized or atomic statement");
3194 if (!saw_cxif
&& b
->kind
== sk_block
3195 && level_for_constexpr_if (b
->level_chain
))
3199 complained
= identify_goto (decl
, input_location
, locus
,
3204 inform (EXPR_LOCATION (b
->level_chain
->this_entity
),
3205 " enters constexpr if statement");
3214 check_previous_goto (tree decl
, struct named_label_use_entry
*use
)
3216 check_previous_goto_1 (decl
, use
->binding_level
,
3217 use
->names_in_scope
, use
->in_omp_scope
,
3218 &use
->o_goto_locus
);
3222 check_switch_goto (cp_binding_level
* level
)
3224 return check_previous_goto_1 (NULL_TREE
, level
, level
->names
, false, NULL
);
3227 /* Check that a new jump to a label DECL is OK. Called by
3228 finish_goto_stmt. */
3231 check_goto (tree decl
)
3233 struct named_label_entry
*ent
, dummy
;
3234 bool saw_catch
= false, complained
= false;
3239 /* We can't know where a computed goto is jumping.
3240 So we assume that it's OK. */
3241 if (TREE_CODE (decl
) != LABEL_DECL
)
3244 /* We didn't record any information about this label when we created it,
3245 and there's not much point since it's trivial to analyze as a return. */
3246 if (decl
== cdtor_label
)
3249 dummy
.label_decl
= decl
;
3250 ent
= named_labels
->find (&dummy
);
3251 gcc_assert (ent
!= NULL
);
3253 /* If the label hasn't been defined yet, defer checking. */
3254 if (! DECL_INITIAL (decl
))
3256 struct named_label_use_entry
*new_use
;
3258 /* Don't bother creating another use if the last goto had the
3259 same data, and will therefore create the same set of errors. */
3261 && ent
->uses
->names_in_scope
== current_binding_level
->names
)
3264 new_use
= ggc_alloc
<named_label_use_entry
> ();
3265 new_use
->binding_level
= current_binding_level
;
3266 new_use
->names_in_scope
= current_binding_level
->names
;
3267 new_use
->o_goto_locus
= input_location
;
3268 new_use
->in_omp_scope
= false;
3270 new_use
->next
= ent
->uses
;
3271 ent
->uses
= new_use
;
3275 if (ent
->in_try_scope
|| ent
->in_catch_scope
|| ent
->in_transaction_scope
3276 || ent
->in_constexpr_if
3277 || ent
->in_omp_scope
|| !vec_safe_is_empty (ent
->bad_decls
))
3279 diagnostic_t diag_kind
= DK_PERMERROR
;
3280 if (ent
->in_try_scope
|| ent
->in_catch_scope
|| ent
->in_constexpr_if
3281 || ent
->in_transaction_scope
|| ent
->in_omp_scope
)
3282 diag_kind
= DK_ERROR
;
3283 complained
= identify_goto (decl
, DECL_SOURCE_LOCATION (decl
),
3284 &input_location
, diag_kind
);
3285 identified
= 1 + (diag_kind
== DK_ERROR
);
3288 FOR_EACH_VEC_SAFE_ELT (ent
->bad_decls
, ix
, bad
)
3290 int u
= decl_jump_unsafe (bad
);
3292 if (u
> 1 && DECL_ARTIFICIAL (bad
))
3294 /* Can't skip init of __exception_info. */
3295 if (identified
== 1)
3297 complained
= identify_goto (decl
, DECL_SOURCE_LOCATION (decl
),
3298 &input_location
, DK_ERROR
);
3302 inform (DECL_SOURCE_LOCATION (bad
), " enters catch block");
3305 else if (complained
)
3308 inform (DECL_SOURCE_LOCATION (bad
),
3309 " skips initialization of %q#D", bad
);
3311 inform (DECL_SOURCE_LOCATION (bad
),
3312 " enters scope of %q#D which has "
3313 "non-trivial destructor", bad
);
3319 if (ent
->in_try_scope
)
3320 inform (input_location
, " enters try block");
3321 else if (ent
->in_catch_scope
&& !saw_catch
)
3322 inform (input_location
, " enters catch block");
3323 else if (ent
->in_transaction_scope
)
3324 inform (input_location
, " enters synchronized or atomic statement");
3325 else if (ent
->in_constexpr_if
)
3326 inform (input_location
, " enters constexpr if statement");
3329 if (ent
->in_omp_scope
)
3332 inform (input_location
, " enters OpenMP structured block");
3334 else if (flag_openmp
)
3336 cp_binding_level
*b
;
3337 for (b
= current_binding_level
; b
; b
= b
->level_chain
)
3339 if (b
== ent
->binding_level
)
3341 if (b
->kind
== sk_omp
)
3345 complained
= identify_goto (decl
,
3346 DECL_SOURCE_LOCATION (decl
),
3347 &input_location
, DK_ERROR
);
3351 inform (input_location
, " exits OpenMP structured block");
3358 /* Check that a return is ok wrt OpenMP structured blocks.
3359 Called by finish_return_stmt. Returns true if all is well. */
3362 check_omp_return (void)
3364 cp_binding_level
*b
;
3365 for (b
= current_binding_level
; b
; b
= b
->level_chain
)
3366 if (b
->kind
== sk_omp
)
3368 error ("invalid exit from OpenMP structured block");
3371 else if (b
->kind
== sk_function_parms
)
3376 /* Define a label, specifying the location in the source file.
3377 Return the LABEL_DECL node for the label. */
3380 define_label_1 (location_t location
, tree name
)
3382 struct named_label_entry
*ent
, dummy
;
3383 cp_binding_level
*p
;
3386 decl
= lookup_label (name
);
3388 dummy
.label_decl
= decl
;
3389 ent
= named_labels
->find (&dummy
);
3390 gcc_assert (ent
!= NULL
);
3392 /* After labels, make any new cleanups in the function go into their
3393 own new (temporary) binding contour. */
3394 for (p
= current_binding_level
;
3395 p
->kind
!= sk_function_parms
;
3397 p
->more_cleanups_ok
= 0;
3399 if (name
== get_identifier ("wchar_t"))
3400 permerror (input_location
, "label named wchar_t");
3402 if (DECL_INITIAL (decl
) != NULL_TREE
)
3404 error ("duplicate label %qD", decl
);
3405 return error_mark_node
;
3409 struct named_label_use_entry
*use
;
3411 /* Mark label as having been defined. */
3412 DECL_INITIAL (decl
) = error_mark_node
;
3413 /* Say where in the source. */
3414 DECL_SOURCE_LOCATION (decl
) = location
;
3416 ent
->binding_level
= current_binding_level
;
3417 ent
->names_in_scope
= current_binding_level
->names
;
3419 for (use
= ent
->uses
; use
; use
= use
->next
)
3420 check_previous_goto (decl
, use
);
3427 /* Wrapper for define_label_1. */
3430 define_label (location_t location
, tree name
)
3433 bool running
= timevar_cond_start (TV_NAME_LOOKUP
);
3434 ret
= define_label_1 (location
, name
);
3435 timevar_cond_stop (TV_NAME_LOOKUP
, running
);
3442 cp_binding_level
*level
;
3443 struct cp_switch
*next
;
3444 /* The SWITCH_STMT being built. */
3446 /* A splay-tree mapping the low element of a case range to the high
3447 element, or NULL_TREE if there is no high element. Used to
3448 determine whether or not a new case label duplicates an old case
3449 label. We need a tree, rather than simply a hash table, because
3450 of the GNU case range extension. */
3452 /* Remember whether there was a case value that is outside the
3453 range of the original type of the controlling expression. */
3454 bool outside_range_p
;
3457 /* A stack of the currently active switch statements. The innermost
3458 switch statement is on the top of the stack. There is no need to
3459 mark the stack for garbage collection because it is only active
3460 during the processing of the body of a function, and we never
3461 collect at that point. */
3463 static struct cp_switch
*switch_stack
;
3465 /* Called right after a switch-statement condition is parsed.
3466 SWITCH_STMT is the switch statement being parsed. */
3469 push_switch (tree switch_stmt
)
3471 struct cp_switch
*p
= XNEW (struct cp_switch
);
3472 p
->level
= current_binding_level
;
3473 p
->next
= switch_stack
;
3474 p
->switch_stmt
= switch_stmt
;
3475 p
->cases
= splay_tree_new (case_compare
, NULL
, NULL
);
3476 p
->outside_range_p
= false;
3483 struct cp_switch
*cs
= switch_stack
;
3484 location_t switch_location
;
3486 /* Emit warnings as needed. */
3487 switch_location
= EXPR_LOC_OR_LOC (cs
->switch_stmt
, input_location
);
3488 const bool bool_cond_p
3489 = (SWITCH_STMT_TYPE (cs
->switch_stmt
)
3490 && TREE_CODE (SWITCH_STMT_TYPE (cs
->switch_stmt
)) == BOOLEAN_TYPE
);
3491 if (!processing_template_decl
)
3492 c_do_switch_warnings (cs
->cases
, switch_location
,
3493 SWITCH_STMT_TYPE (cs
->switch_stmt
),
3494 SWITCH_STMT_COND (cs
->switch_stmt
),
3495 bool_cond_p
, cs
->outside_range_p
);
3497 splay_tree_delete (cs
->cases
);
3498 switch_stack
= switch_stack
->next
;
3502 /* Convert a case constant VALUE in a switch to the type TYPE of the switch
3503 condition. Note that if TYPE and VALUE are already integral we don't
3504 really do the conversion because the language-independent
3505 warning/optimization code will work better that way. */
3508 case_conversion (tree type
, tree value
)
3510 if (value
== NULL_TREE
)
3513 if (cxx_dialect
>= cxx11
3514 && (SCOPED_ENUM_P (type
)
3515 || !INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (value
))))
3517 if (INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type
))
3518 type
= type_promotes_to (type
);
3519 value
= (perform_implicit_conversion_flags
3520 (type
, value
, tf_warning_or_error
,
3521 LOOKUP_IMPLICIT
| LOOKUP_NO_NON_INTEGRAL
));
3523 return cxx_constant_value (value
);
3526 /* Note that we've seen a definition of a case label, and complain if this
3527 is a bad place for one. */
3530 finish_case_label (location_t loc
, tree low_value
, tree high_value
)
3533 cp_binding_level
*p
;
3536 if (processing_template_decl
)
3540 /* For templates, just add the case label; we'll do semantic
3541 analysis at instantiation-time. */
3542 label
= build_decl (loc
, LABEL_DECL
, NULL_TREE
, NULL_TREE
);
3543 return add_stmt (build_case_label (low_value
, high_value
, label
));
3546 /* Find the condition on which this switch statement depends. */
3547 cond
= SWITCH_STMT_COND (switch_stack
->switch_stmt
);
3548 if (cond
&& TREE_CODE (cond
) == TREE_LIST
)
3549 cond
= TREE_VALUE (cond
);
3551 if (!check_switch_goto (switch_stack
->level
))
3552 return error_mark_node
;
3554 type
= SWITCH_STMT_TYPE (switch_stack
->switch_stmt
);
3556 low_value
= case_conversion (type
, low_value
);
3557 high_value
= case_conversion (type
, high_value
);
3559 r
= c_add_case_label (loc
, switch_stack
->cases
, cond
, type
,
3560 low_value
, high_value
,
3561 &switch_stack
->outside_range_p
);
3563 /* After labels, make any new cleanups in the function go into their
3564 own new (temporary) binding contour. */
3565 for (p
= current_binding_level
;
3566 p
->kind
!= sk_function_parms
;
3568 p
->more_cleanups_ok
= 0;
3573 struct typename_info
{
3581 struct typename_hasher
: ggc_ptr_hash
<tree_node
>
3583 typedef typename_info
*compare_type
;
3585 /* Hash a TYPENAME_TYPE. */
3592 hash
= (htab_hash_pointer (TYPE_CONTEXT (t
))
3593 ^ htab_hash_pointer (TYPE_IDENTIFIER (t
)));
3598 /* Compare two TYPENAME_TYPEs. */
3601 equal (tree t1
, const typename_info
*t2
)
3603 return (TYPE_IDENTIFIER (t1
) == t2
->name
3604 && TYPE_CONTEXT (t1
) == t2
->scope
3605 && TYPENAME_TYPE_FULLNAME (t1
) == t2
->template_id
3606 && TYPENAME_IS_ENUM_P (t1
) == t2
->enum_p
3607 && TYPENAME_IS_CLASS_P (t1
) == t2
->class_p
);
3611 /* Build a TYPENAME_TYPE. If the type is `typename T::t', CONTEXT is
3612 the type of `T', NAME is the IDENTIFIER_NODE for `t'.
3614 Returns the new TYPENAME_TYPE. */
3616 static GTY (()) hash_table
<typename_hasher
> *typename_htab
;
3619 build_typename_type (tree context
, tree name
, tree fullname
,
3620 enum tag_types tag_type
)
3628 if (typename_htab
== NULL
)
3629 typename_htab
= hash_table
<typename_hasher
>::create_ggc (61);
3631 ti
.scope
= FROB_CONTEXT (context
);
3633 ti
.template_id
= fullname
;
3634 ti
.enum_p
= tag_type
== enum_type
;
3635 ti
.class_p
= (tag_type
== class_type
3636 || tag_type
== record_type
3637 || tag_type
== union_type
);
3638 hash
= (htab_hash_pointer (ti
.scope
)
3639 ^ htab_hash_pointer (ti
.name
));
3641 /* See if we already have this type. */
3642 e
= typename_htab
->find_slot_with_hash (&ti
, hash
, INSERT
);
3647 /* Build the TYPENAME_TYPE. */
3648 t
= cxx_make_type (TYPENAME_TYPE
);
3649 TYPE_CONTEXT (t
) = ti
.scope
;
3650 TYPENAME_TYPE_FULLNAME (t
) = ti
.template_id
;
3651 TYPENAME_IS_ENUM_P (t
) = ti
.enum_p
;
3652 TYPENAME_IS_CLASS_P (t
) = ti
.class_p
;
3654 /* Build the corresponding TYPE_DECL. */
3655 d
= build_decl (input_location
, TYPE_DECL
, name
, t
);
3656 TYPE_NAME (TREE_TYPE (d
)) = d
;
3657 TYPE_STUB_DECL (TREE_TYPE (d
)) = d
;
3658 DECL_CONTEXT (d
) = FROB_CONTEXT (context
);
3659 DECL_ARTIFICIAL (d
) = 1;
3661 /* Store it in the hash table. */
3664 /* TYPENAME_TYPEs must always be compared structurally, because
3665 they may or may not resolve down to another type depending on
3666 the currently open classes. */
3667 SET_TYPE_STRUCTURAL_EQUALITY (t
);
3673 /* Resolve `typename CONTEXT::NAME'. TAG_TYPE indicates the tag
3674 provided to name the type. Returns an appropriate type, unless an
3675 error occurs, in which case error_mark_node is returned. If we
3676 locate a non-artificial TYPE_DECL and TF_KEEP_TYPE_DECL is set, we
3677 return that, rather than the _TYPE it corresponds to, in other
3678 cases we look through the type decl. If TF_ERROR is set, complain
3679 about errors, otherwise be quiet. */
3682 make_typename_type (tree context
, tree name
, enum tag_types tag_type
,
3683 tsubst_flags_t complain
)
3689 if (name
== error_mark_node
3690 || context
== NULL_TREE
3691 || context
== error_mark_node
)
3692 return error_mark_node
;
3696 if (!(TYPE_LANG_SPECIFIC (name
)
3697 && (CLASSTYPE_IS_TEMPLATE (name
)
3698 || CLASSTYPE_USE_TEMPLATE (name
))))
3699 name
= TYPE_IDENTIFIER (name
);
3701 /* Create a TEMPLATE_ID_EXPR for the type. */
3702 name
= build_nt (TEMPLATE_ID_EXPR
,
3703 CLASSTYPE_TI_TEMPLATE (name
),
3704 CLASSTYPE_TI_ARGS (name
));
3706 else if (TREE_CODE (name
) == TYPE_DECL
)
3707 name
= DECL_NAME (name
);
3711 if (TREE_CODE (name
) == TEMPLATE_ID_EXPR
)
3713 name
= TREE_OPERAND (name
, 0);
3714 if (DECL_TYPE_TEMPLATE_P (name
))
3715 name
= TREE_OPERAND (fullname
, 0) = DECL_NAME (name
);
3716 if (TREE_CODE (name
) != IDENTIFIER_NODE
)
3718 if (complain
& tf_error
)
3719 error ("%qD is not a type", name
);
3720 return error_mark_node
;
3723 if (TREE_CODE (name
) == TEMPLATE_DECL
)
3725 if (complain
& tf_error
)
3726 error ("%qD used without template parameters", name
);
3727 return error_mark_node
;
3729 gcc_assert (identifier_p (name
));
3730 gcc_assert (TYPE_P (context
));
3732 if (!MAYBE_CLASS_TYPE_P (context
))
3734 if (complain
& tf_error
)
3735 error ("%q#T is not a class", context
);
3736 return error_mark_node
;
3739 /* When the CONTEXT is a dependent type, NAME could refer to a
3740 dependent base class of CONTEXT. But look inside it anyway
3741 if CONTEXT is a currently open scope, in case it refers to a
3742 member of the current instantiation or a non-dependent base;
3743 lookup will stop when we hit a dependent base. */
3744 if (!dependent_scope_p (context
))
3745 /* We should only set WANT_TYPE when we're a nested typename type.
3746 Then we can give better diagnostics if we find a non-type. */
3747 t
= lookup_field (context
, name
, 2, /*want_type=*/true);
3751 if ((!t
|| TREE_CODE (t
) == TREE_LIST
) && dependent_type_p (context
))
3752 return build_typename_type (context
, name
, fullname
, tag_type
);
3754 want_template
= TREE_CODE (fullname
) == TEMPLATE_ID_EXPR
;
3758 if (complain
& tf_error
)
3760 if (!COMPLETE_TYPE_P (context
))
3761 cxx_incomplete_type_error (NULL_TREE
, context
);
3763 error (want_template
? G_("no class template named %q#T in %q#T")
3764 : G_("no type named %q#T in %q#T"), name
, context
);
3766 return error_mark_node
;
3769 /* Pull out the template from an injected-class-name (or multiple). */
3771 t
= maybe_get_template_decl_from_type_decl (t
);
3773 if (TREE_CODE (t
) == TREE_LIST
)
3775 if (complain
& tf_error
)
3777 error ("lookup of %qT in %qT is ambiguous", name
, context
);
3778 print_candidates (t
);
3780 return error_mark_node
;
3783 if (want_template
&& !DECL_TYPE_TEMPLATE_P (t
))
3785 if (complain
& tf_error
)
3786 error ("%<typename %T::%D%> names %q#T, which is not a class template",
3788 return error_mark_node
;
3790 if (!want_template
&& TREE_CODE (t
) != TYPE_DECL
)
3792 if (complain
& tf_error
)
3793 error ("%<typename %T::%D%> names %q#T, which is not a type",
3795 return error_mark_node
;
3798 if (!perform_or_defer_access_check (TYPE_BINFO (context
), t
, t
, complain
))
3799 return error_mark_node
;
3801 /* If we are currently parsing a template and if T is a typedef accessed
3802 through CONTEXT then we need to remember and check access of T at
3803 template instantiation time. */
3804 add_typedef_to_current_template_for_access_check (t
, context
, input_location
);
3807 return lookup_template_class (t
, TREE_OPERAND (fullname
, 1),
3809 /*entering_scope=*/0,
3810 complain
| tf_user
);
3812 if (DECL_ARTIFICIAL (t
) || !(complain
& tf_keep_type_decl
))
3815 maybe_record_typedef_use (t
);
3820 /* Resolve `CONTEXT::template NAME'. Returns a TEMPLATE_DECL if the name
3821 can be resolved or an UNBOUND_CLASS_TEMPLATE, unless an error occurs,
3822 in which case error_mark_node is returned.
3824 If PARM_LIST is non-NULL, also make sure that the template parameter
3825 list of TEMPLATE_DECL matches.
3827 If COMPLAIN zero, don't complain about any errors that occur. */
3830 make_unbound_class_template (tree context
, tree name
, tree parm_list
,
3831 tsubst_flags_t complain
)
3837 name
= TYPE_IDENTIFIER (name
);
3838 else if (DECL_P (name
))
3839 name
= DECL_NAME (name
);
3840 gcc_assert (identifier_p (name
));
3842 if (!dependent_type_p (context
)
3843 || currently_open_class (context
))
3845 tree tmpl
= NULL_TREE
;
3847 if (MAYBE_CLASS_TYPE_P (context
))
3848 tmpl
= lookup_field (context
, name
, 0, false);
3850 if (tmpl
&& TREE_CODE (tmpl
) == TYPE_DECL
)
3851 tmpl
= maybe_get_template_decl_from_type_decl (tmpl
);
3853 if (!tmpl
|| !DECL_TYPE_TEMPLATE_P (tmpl
))
3855 if (complain
& tf_error
)
3856 error ("no class template named %q#T in %q#T", name
, context
);
3857 return error_mark_node
;
3861 && !comp_template_parms (DECL_TEMPLATE_PARMS (tmpl
), parm_list
))
3863 if (complain
& tf_error
)
3865 error ("template parameters do not match template %qD", tmpl
);
3866 inform (DECL_SOURCE_LOCATION (tmpl
),
3867 "%qD declared here", tmpl
);
3869 return error_mark_node
;
3872 if (!perform_or_defer_access_check (TYPE_BINFO (context
), tmpl
, tmpl
,
3874 return error_mark_node
;
3879 /* Build the UNBOUND_CLASS_TEMPLATE. */
3880 t
= cxx_make_type (UNBOUND_CLASS_TEMPLATE
);
3881 TYPE_CONTEXT (t
) = FROB_CONTEXT (context
);
3882 TREE_TYPE (t
) = NULL_TREE
;
3883 SET_TYPE_STRUCTURAL_EQUALITY (t
);
3885 /* Build the corresponding TEMPLATE_DECL. */
3886 d
= build_decl (input_location
, TEMPLATE_DECL
, name
, t
);
3887 TYPE_NAME (TREE_TYPE (d
)) = d
;
3888 TYPE_STUB_DECL (TREE_TYPE (d
)) = d
;
3889 DECL_CONTEXT (d
) = FROB_CONTEXT (context
);
3890 DECL_ARTIFICIAL (d
) = 1;
3891 DECL_TEMPLATE_PARMS (d
) = parm_list
;
3898 /* Push the declarations of builtin types into the namespace.
3899 RID_INDEX is the index of the builtin type in the array
3900 RID_POINTERS. NAME is the name used when looking up the builtin
3901 type. TYPE is the _TYPE node for the builtin type. */
3904 record_builtin_type (enum rid rid_index
,
3908 tree rname
= NULL_TREE
, tname
= NULL_TREE
;
3909 tree tdecl
= NULL_TREE
;
3911 if ((int) rid_index
< (int) RID_MAX
)
3912 rname
= ridpointers
[(int) rid_index
];
3914 tname
= get_identifier (name
);
3916 /* The calls to SET_IDENTIFIER_GLOBAL_VALUE below should be
3917 eliminated. Built-in types should not be looked up name; their
3918 names are keywords that the parser can recognize. However, there
3919 is code in c-common.c that uses identifier_global_value to look
3920 up built-in types by name. */
3923 tdecl
= build_decl (BUILTINS_LOCATION
, TYPE_DECL
, tname
, type
);
3924 DECL_ARTIFICIAL (tdecl
) = 1;
3925 SET_IDENTIFIER_GLOBAL_VALUE (tname
, tdecl
);
3931 tdecl
= build_decl (BUILTINS_LOCATION
, TYPE_DECL
, rname
, type
);
3932 DECL_ARTIFICIAL (tdecl
) = 1;
3934 SET_IDENTIFIER_GLOBAL_VALUE (rname
, tdecl
);
3937 if (!TYPE_NAME (type
))
3938 TYPE_NAME (type
) = tdecl
;
3941 debug_hooks
->type_decl (tdecl
, 0);
3944 /* Push a type into the namespace so that the back ends ignore it. */
3947 record_unknown_type (tree type
, const char* name
)
3949 tree decl
= pushdecl (build_decl (UNKNOWN_LOCATION
,
3950 TYPE_DECL
, get_identifier (name
), type
));
3951 /* Make sure the "unknown type" typedecl gets ignored for debug info. */
3952 DECL_IGNORED_P (decl
) = 1;
3953 TYPE_DECL_SUPPRESS_DEBUG (decl
) = 1;
3954 TYPE_SIZE (type
) = TYPE_SIZE (void_type_node
);
3955 SET_TYPE_ALIGN (type
, 1);
3956 TYPE_USER_ALIGN (type
) = 0;
3957 SET_TYPE_MODE (type
, TYPE_MODE (void_type_node
));
3960 /* A string for which we should create an IDENTIFIER_NODE at
3963 struct predefined_identifier
3965 /* The name of the identifier. */
3966 const char *const name
;
3967 /* The place where the IDENTIFIER_NODE should be stored. */
3969 /* Nonzero if this is the name of a constructor or destructor. */
3970 const int ctor_or_dtor_p
;
3973 /* Create all the predefined identifiers. */
3976 initialize_predefined_identifiers (void)
3978 const predefined_identifier
*pid
;
3980 /* A table of identifiers to create at startup. */
3981 static const predefined_identifier predefined_identifiers
[] = {
3982 { "C++", &lang_name_cplusplus
, 0 },
3983 { "C", &lang_name_c
, 0 },
3984 /* Some of these names have a trailing space so that it is
3985 impossible for them to conflict with names written by users. */
3986 { "__ct ", &ctor_identifier
, 1 },
3987 { "__base_ctor ", &base_ctor_identifier
, 1 },
3988 { "__comp_ctor ", &complete_ctor_identifier
, 1 },
3989 { "__dt ", &dtor_identifier
, 1 },
3990 { "__comp_dtor ", &complete_dtor_identifier
, 1 },
3991 { "__base_dtor ", &base_dtor_identifier
, 1 },
3992 { "__deleting_dtor ", &deleting_dtor_identifier
, 1 },
3993 { IN_CHARGE_NAME
, &in_charge_identifier
, 0 },
3994 { "nelts", &nelts_identifier
, 0 },
3995 { THIS_NAME
, &this_identifier
, 0 },
3996 { VTABLE_DELTA_NAME
, &delta_identifier
, 0 },
3997 { VTABLE_PFN_NAME
, &pfn_identifier
, 0 },
3998 { "_vptr", &vptr_identifier
, 0 },
3999 { "__vtt_parm", &vtt_parm_identifier
, 0 },
4000 { "::", &global_scope_name
, 0 },
4001 { "std", &std_identifier
, 0 },
4005 for (pid
= predefined_identifiers
; pid
->name
; ++pid
)
4007 *pid
->node
= get_identifier (pid
->name
);
4008 if (pid
->ctor_or_dtor_p
)
4009 IDENTIFIER_CTOR_OR_DTOR_P (*pid
->node
) = 1;
4013 /* Create the predefined scalar types of C,
4014 and some nodes representing standard constants (0, 1, (void *)0).
4015 Initialize the global binding level.
4016 Make definitions for built-in primitive functions. */
4019 cxx_init_decl_processing (void)
4022 tree void_ftype_ptr
;
4024 /* Create all the identifiers we need. */
4025 initialize_predefined_identifiers ();
4027 /* Create the global variables. */
4028 push_to_top_level ();
4030 current_function_decl
= NULL_TREE
;
4031 current_binding_level
= NULL
;
4032 /* Enter the global namespace. */
4033 gcc_assert (global_namespace
== NULL_TREE
);
4034 global_namespace
= build_lang_decl (NAMESPACE_DECL
, global_scope_name
,
4036 DECL_CONTEXT (global_namespace
) = build_translation_unit_decl (NULL_TREE
);
4037 debug_hooks
->register_main_translation_unit
4038 (DECL_CONTEXT (global_namespace
));
4039 TREE_PUBLIC (global_namespace
) = 1;
4040 begin_scope (sk_namespace
, global_namespace
);
4042 if (flag_visibility_ms_compat
)
4043 default_visibility
= VISIBILITY_HIDDEN
;
4046 current_lang_name
= lang_name_c
;
4048 /* Create the `std' namespace. */
4049 push_namespace (std_identifier
);
4050 std_node
= current_namespace
;
4053 flag_noexcept_type
= (cxx_dialect
>= cxx1z
);
4055 c_common_nodes_and_builtins ();
4057 integer_two_node
= build_int_cst (NULL_TREE
, 2);
4059 record_builtin_type (RID_BOOL
, "bool", boolean_type_node
);
4060 truthvalue_type_node
= boolean_type_node
;
4061 truthvalue_false_node
= boolean_false_node
;
4062 truthvalue_true_node
= boolean_true_node
;
4064 empty_except_spec
= build_tree_list (NULL_TREE
, NULL_TREE
);
4065 noexcept_true_spec
= build_tree_list (boolean_true_node
, NULL_TREE
);
4066 noexcept_false_spec
= build_tree_list (boolean_false_node
, NULL_TREE
);
4069 record_builtin_type (RID_MAX
, NULL
, string_type_node
);
4072 delta_type_node
= ptrdiff_type_node
;
4073 vtable_index_type
= ptrdiff_type_node
;
4075 vtt_parm_type
= build_pointer_type (const_ptr_type_node
);
4076 void_ftype
= build_function_type_list (void_type_node
, NULL_TREE
);
4077 void_ftype_ptr
= build_function_type_list (void_type_node
,
4078 ptr_type_node
, NULL_TREE
);
4080 = build_exception_variant (void_ftype_ptr
, empty_except_spec
);
4082 /* C++ extensions */
4084 unknown_type_node
= make_node (LANG_TYPE
);
4085 record_unknown_type (unknown_type_node
, "unknown type");
4087 /* Indirecting an UNKNOWN_TYPE node yields an UNKNOWN_TYPE node. */
4088 TREE_TYPE (unknown_type_node
) = unknown_type_node
;
4090 /* Looking up TYPE_POINTER_TO and TYPE_REFERENCE_TO yield the same
4092 TYPE_POINTER_TO (unknown_type_node
) = unknown_type_node
;
4093 TYPE_REFERENCE_TO (unknown_type_node
) = unknown_type_node
;
4095 init_list_type_node
= make_node (LANG_TYPE
);
4096 record_unknown_type (init_list_type_node
, "init list");
4099 /* Make sure we get a unique function type, so we can give
4100 its pointer type a name. (This wins for gdb.) */
4101 tree vfunc_type
= make_node (FUNCTION_TYPE
);
4102 TREE_TYPE (vfunc_type
) = integer_type_node
;
4103 TYPE_ARG_TYPES (vfunc_type
) = NULL_TREE
;
4104 layout_type (vfunc_type
);
4106 vtable_entry_type
= build_pointer_type (vfunc_type
);
4108 record_builtin_type (RID_MAX
, VTBL_PTR_TYPE
, vtable_entry_type
);
4111 = build_cplus_array_type (vtable_entry_type
, NULL_TREE
);
4112 layout_type (vtbl_type_node
);
4113 vtbl_type_node
= cp_build_qualified_type (vtbl_type_node
, TYPE_QUAL_CONST
);
4114 record_builtin_type (RID_MAX
, NULL
, vtbl_type_node
);
4115 vtbl_ptr_type_node
= build_pointer_type (vtable_entry_type
);
4116 layout_type (vtbl_ptr_type_node
);
4117 record_builtin_type (RID_MAX
, NULL
, vtbl_ptr_type_node
);
4119 push_namespace (get_identifier ("__cxxabiv1"));
4120 abi_node
= current_namespace
;
4123 global_type_node
= make_node (LANG_TYPE
);
4124 record_unknown_type (global_type_node
, "global type");
4127 current_lang_name
= lang_name_cplusplus
;
4129 if (aligned_new_threshold
> 1
4130 && !pow2p_hwi (aligned_new_threshold
))
4132 error ("-faligned-new=%d is not a power of two", aligned_new_threshold
);
4133 aligned_new_threshold
= 1;
4135 if (aligned_new_threshold
== -1)
4136 aligned_new_threshold
= (cxx_dialect
>= cxx1z
) ? 1 : 0;
4137 if (aligned_new_threshold
== 1)
4138 aligned_new_threshold
= malloc_alignment () / BITS_PER_UNIT
;
4141 tree newattrs
, extvisattr
;
4142 tree newtype
, deltype
;
4143 tree ptr_ftype_sizetype
;
4147 = build_function_type_list (ptr_type_node
, size_type_node
, NULL_TREE
);
4148 if (cxx_dialect
== cxx98
)
4151 tree bad_alloc_type_node
;
4152 tree bad_alloc_decl
;
4154 push_namespace (std_identifier
);
4155 bad_alloc_id
= get_identifier ("bad_alloc");
4156 bad_alloc_type_node
= make_class_type (RECORD_TYPE
);
4157 TYPE_CONTEXT (bad_alloc_type_node
) = current_namespace
;
4159 = create_implicit_typedef (bad_alloc_id
, bad_alloc_type_node
);
4160 DECL_CONTEXT (bad_alloc_decl
) = current_namespace
;
4164 = add_exception_specifier (NULL_TREE
, bad_alloc_type_node
, -1);
4167 new_eh_spec
= noexcept_false_spec
;
4169 /* Ensure attribs.c is initialized. */
4172 /* Ensure constraint.cc is initialized. */
4173 init_constraint_processing ();
4175 extvisattr
= build_tree_list (get_identifier ("externally_visible"),
4177 newattrs
= tree_cons (get_identifier ("alloc_size"),
4178 build_tree_list (NULL_TREE
, integer_one_node
),
4180 newtype
= cp_build_type_attribute_variant (ptr_ftype_sizetype
, newattrs
);
4181 newtype
= build_exception_variant (newtype
, new_eh_spec
);
4182 deltype
= cp_build_type_attribute_variant (void_ftype_ptr
, extvisattr
);
4183 deltype
= build_exception_variant (deltype
, empty_except_spec
);
4184 tree opnew
= push_cp_library_fn (NEW_EXPR
, newtype
, 0);
4185 DECL_IS_MALLOC (opnew
) = 1;
4186 DECL_IS_OPERATOR_NEW (opnew
) = 1;
4187 opnew
= push_cp_library_fn (VEC_NEW_EXPR
, newtype
, 0);
4188 DECL_IS_MALLOC (opnew
) = 1;
4189 DECL_IS_OPERATOR_NEW (opnew
) = 1;
4190 push_cp_library_fn (DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4191 push_cp_library_fn (VEC_DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4192 if (flag_sized_deallocation
)
4194 /* Also push the sized deallocation variants:
4195 void operator delete(void*, std::size_t) throw();
4196 void operator delete[](void*, std::size_t) throw(); */
4197 tree void_ftype_ptr_size
4198 = build_function_type_list (void_type_node
, ptr_type_node
,
4199 size_type_node
, NULL_TREE
);
4200 deltype
= cp_build_type_attribute_variant (void_ftype_ptr_size
,
4202 deltype
= build_exception_variant (deltype
, empty_except_spec
);
4203 push_cp_library_fn (DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4204 push_cp_library_fn (VEC_DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4207 if (aligned_new_threshold
)
4209 push_namespace (std_identifier
);
4210 tree align_id
= get_identifier ("align_val_t");
4211 align_type_node
= start_enum (align_id
, NULL_TREE
, size_type_node
,
4212 NULL_TREE
, /*scoped*/true, NULL
);
4215 /* operator new (size_t, align_val_t); */
4216 newtype
= build_function_type_list (ptr_type_node
, size_type_node
,
4217 align_type_node
, NULL_TREE
);
4218 newtype
= cp_build_type_attribute_variant (newtype
, newattrs
);
4219 newtype
= build_exception_variant (newtype
, new_eh_spec
);
4220 opnew
= push_cp_library_fn (NEW_EXPR
, newtype
, 0);
4221 DECL_IS_MALLOC (opnew
) = 1;
4222 DECL_IS_OPERATOR_NEW (opnew
) = 1;
4223 opnew
= push_cp_library_fn (VEC_NEW_EXPR
, newtype
, 0);
4224 DECL_IS_MALLOC (opnew
) = 1;
4225 DECL_IS_OPERATOR_NEW (opnew
) = 1;
4227 /* operator delete (void *, align_val_t); */
4228 deltype
= build_function_type_list (void_type_node
, ptr_type_node
,
4229 align_type_node
, NULL_TREE
);
4230 deltype
= cp_build_type_attribute_variant (deltype
, extvisattr
);
4231 deltype
= build_exception_variant (deltype
, empty_except_spec
);
4232 push_cp_library_fn (DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4233 push_cp_library_fn (VEC_DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4235 if (flag_sized_deallocation
)
4237 /* operator delete (void *, size_t, align_val_t); */
4238 deltype
= build_function_type_list (void_type_node
, ptr_type_node
,
4239 size_type_node
, align_type_node
,
4241 deltype
= cp_build_type_attribute_variant (deltype
, extvisattr
);
4242 deltype
= build_exception_variant (deltype
, empty_except_spec
);
4243 push_cp_library_fn (DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4244 push_cp_library_fn (VEC_DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4248 nullptr_type_node
= make_node (NULLPTR_TYPE
);
4249 TYPE_SIZE (nullptr_type_node
) = bitsize_int (GET_MODE_BITSIZE (ptr_mode
));
4250 TYPE_SIZE_UNIT (nullptr_type_node
) = size_int (GET_MODE_SIZE (ptr_mode
));
4251 TYPE_UNSIGNED (nullptr_type_node
) = 1;
4252 TYPE_PRECISION (nullptr_type_node
) = GET_MODE_BITSIZE (ptr_mode
);
4253 if (abi_version_at_least (9))
4254 SET_TYPE_ALIGN (nullptr_type_node
, GET_MODE_ALIGNMENT (ptr_mode
));
4255 SET_TYPE_MODE (nullptr_type_node
, ptr_mode
);
4256 record_builtin_type (RID_MAX
, "decltype(nullptr)", nullptr_type_node
);
4257 nullptr_node
= build_int_cst (nullptr_type_node
, 0);
4261 = build_library_fn_ptr ("__cxa_pure_virtual", void_ftype
,
4262 ECF_NORETURN
| ECF_NOTHROW
);
4264 /* Perform other language dependent initializations. */
4265 init_class_processing ();
4266 init_rtti_processing ();
4267 init_template_processing ();
4269 if (flag_exceptions
)
4270 init_exception_processing ();
4272 if (! supports_one_only ())
4275 make_fname_decl
= cp_make_fname_decl
;
4276 start_fname_decls ();
4278 /* Show we use EH for cleanups. */
4279 if (flag_exceptions
)
4280 using_eh_for_cleanups ();
4283 /* Generate an initializer for a function naming variable from
4284 NAME. NAME may be NULL, to indicate a dependent name. TYPE_P is
4285 filled in with the type of the init. */
4288 cp_fname_init (const char* name
, tree
*type_p
)
4290 tree domain
= NULL_TREE
;
4292 tree init
= NULL_TREE
;
4297 length
= strlen (name
);
4298 domain
= build_index_type (size_int (length
));
4299 init
= build_string (length
+ 1, name
);
4302 type
= cp_build_qualified_type (char_type_node
, TYPE_QUAL_CONST
);
4303 type
= build_cplus_array_type (type
, domain
);
4308 TREE_TYPE (init
) = type
;
4310 init
= error_mark_node
;
4315 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give
4316 the decl, LOC is the location to give the decl, NAME is the
4317 initialization string and TYPE_DEP indicates whether NAME depended
4318 on the type of the function. We make use of that to detect
4319 __PRETTY_FUNCTION__ inside a template fn. This is being done lazily
4320 at the point of first use, so we mustn't push the decl now. */
4323 cp_make_fname_decl (location_t loc
, tree id
, int type_dep
)
4325 const char *const name
= (type_dep
&& processing_template_decl
4326 ? NULL
: fname_as_string (type_dep
));
4328 tree init
= cp_fname_init (name
, &type
);
4329 tree decl
= build_decl (loc
, VAR_DECL
, id
, type
);
4332 free (CONST_CAST (char *, name
));
4334 /* As we're using pushdecl_with_scope, we must set the context. */
4335 DECL_CONTEXT (decl
) = current_function_decl
;
4337 TREE_STATIC (decl
) = 1;
4338 TREE_READONLY (decl
) = 1;
4339 DECL_ARTIFICIAL (decl
) = 1;
4341 TREE_USED (decl
) = 1;
4343 if (current_function_decl
)
4345 cp_binding_level
*b
= current_binding_level
;
4346 if (b
->kind
== sk_function_parms
)
4347 return error_mark_node
;
4348 while (b
->level_chain
->kind
!= sk_function_parms
)
4350 pushdecl_with_scope (decl
, b
, /*is_friend=*/false);
4351 cp_finish_decl (decl
, init
, /*init_const_expr_p=*/false, NULL_TREE
,
4352 LOOKUP_ONLYCONVERTING
);
4356 DECL_THIS_STATIC (decl
) = true;
4357 pushdecl_top_level_and_finish (decl
, init
);
4364 builtin_function_1 (tree decl
, tree context
, bool is_global
)
4366 tree id
= DECL_NAME (decl
);
4367 const char *name
= IDENTIFIER_POINTER (id
);
4369 retrofit_lang_decl (decl
);
4371 DECL_ARTIFICIAL (decl
) = 1;
4372 SET_OVERLOADED_OPERATOR_CODE (decl
, ERROR_MARK
);
4373 SET_DECL_LANGUAGE (decl
, lang_c
);
4374 /* Runtime library routines are, by definition, available in an
4375 external shared object. */
4376 DECL_VISIBILITY (decl
) = VISIBILITY_DEFAULT
;
4377 DECL_VISIBILITY_SPECIFIED (decl
) = 1;
4379 DECL_CONTEXT (decl
) = context
;
4382 pushdecl_top_level (decl
);
4386 /* A function in the user's namespace should have an explicit
4387 declaration before it is used. Mark the built-in function as
4388 anticipated but not actually declared. */
4389 if (name
[0] != '_' || name
[1] != '_')
4390 DECL_ANTICIPATED (decl
) = 1;
4391 else if (strncmp (name
+ 2, "builtin_", strlen ("builtin_")) != 0)
4393 size_t len
= strlen (name
);
4395 /* Treat __*_chk fortification functions as anticipated as well,
4396 unless they are __builtin_*. */
4397 if (len
> strlen ("___chk")
4398 && memcmp (name
+ len
- strlen ("_chk"),
4399 "_chk", strlen ("_chk") + 1) == 0)
4400 DECL_ANTICIPATED (decl
) = 1;
4407 cxx_builtin_function (tree decl
)
4409 tree id
= DECL_NAME (decl
);
4410 const char *name
= IDENTIFIER_POINTER (id
);
4411 /* All builtins that don't begin with an '_' should additionally
4412 go in the 'std' namespace. */
4415 tree decl2
= copy_node(decl
);
4416 push_namespace (std_identifier
);
4417 builtin_function_1 (decl2
, std_node
, false);
4421 return builtin_function_1 (decl
, NULL_TREE
, false);
4424 /* Like cxx_builtin_function, but guarantee the function is added to the global
4425 scope. This is to allow function specific options to add new machine
4426 dependent builtins when the target ISA changes via attribute((target(...)))
4427 which saves space on program startup if the program does not use non-generic
4431 cxx_builtin_function_ext_scope (tree decl
)
4434 tree id
= DECL_NAME (decl
);
4435 const char *name
= IDENTIFIER_POINTER (id
);
4436 /* All builtins that don't begin with an '_' should additionally
4437 go in the 'std' namespace. */
4440 tree decl2
= copy_node(decl
);
4441 push_namespace (std_identifier
);
4442 builtin_function_1 (decl2
, std_node
, true);
4446 return builtin_function_1 (decl
, NULL_TREE
, true);
4449 /* Generate a FUNCTION_DECL with the typical flags for a runtime library
4450 function. Not called directly. */
4453 build_library_fn (tree name
, enum tree_code operator_code
, tree type
,
4456 tree fn
= build_lang_decl (FUNCTION_DECL
, name
, type
);
4457 DECL_EXTERNAL (fn
) = 1;
4458 TREE_PUBLIC (fn
) = 1;
4459 DECL_ARTIFICIAL (fn
) = 1;
4460 SET_OVERLOADED_OPERATOR_CODE (fn
, operator_code
);
4461 SET_DECL_LANGUAGE (fn
, lang_c
);
4462 /* Runtime library routines are, by definition, available in an
4463 external shared object. */
4464 DECL_VISIBILITY (fn
) = VISIBILITY_DEFAULT
;
4465 DECL_VISIBILITY_SPECIFIED (fn
) = 1;
4466 set_call_expr_flags (fn
, ecf_flags
);
4470 /* Returns the _DECL for a library function with C++ linkage. */
4473 build_cp_library_fn (tree name
, enum tree_code operator_code
, tree type
,
4476 tree fn
= build_library_fn (name
, operator_code
, type
, ecf_flags
);
4477 DECL_CONTEXT (fn
) = FROB_CONTEXT (current_namespace
);
4478 SET_DECL_LANGUAGE (fn
, lang_cplusplus
);
4482 /* Like build_library_fn, but takes a C string instead of an
4486 build_library_fn_ptr (const char* name
, tree type
, int ecf_flags
)
4488 return build_library_fn (get_identifier (name
), ERROR_MARK
, type
, ecf_flags
);
4491 /* Like build_cp_library_fn, but takes a C string instead of an
4495 build_cp_library_fn_ptr (const char* name
, tree type
, int ecf_flags
)
4497 return build_cp_library_fn (get_identifier (name
), ERROR_MARK
, type
,
4501 /* Like build_library_fn, but also pushes the function so that we will
4502 be able to find it via IDENTIFIER_GLOBAL_VALUE. Also, the function
4503 may throw exceptions listed in RAISES. */
4506 push_library_fn (tree name
, tree type
, tree raises
, int ecf_flags
)
4511 type
= build_exception_variant (type
, raises
);
4513 fn
= build_library_fn (name
, ERROR_MARK
, type
, ecf_flags
);
4514 pushdecl_top_level (fn
);
4518 /* Like build_cp_library_fn, but also pushes the function so that it
4519 will be found by normal lookup. */
4522 push_cp_library_fn (enum tree_code operator_code
, tree type
,
4525 tree fn
= build_cp_library_fn (ansi_opname (operator_code
),
4530 apply_tm_attr (fn
, get_identifier ("transaction_safe"));
4534 /* Like push_library_fn, but takes a TREE_LIST of parm types rather than
4538 push_void_library_fn (tree name
, tree parmtypes
, int ecf_flags
)
4540 tree type
= build_function_type (void_type_node
, parmtypes
);
4541 return push_library_fn (name
, type
, NULL_TREE
, ecf_flags
);
4544 /* Like push_library_fn, but also note that this function throws
4545 and does not return. Used for __throw_foo and the like. */
4548 push_throw_library_fn (tree name
, tree type
)
4550 tree fn
= push_library_fn (name
, type
, NULL_TREE
, ECF_NORETURN
);
4554 /* When we call finish_struct for an anonymous union, we create
4555 default copy constructors and such. But, an anonymous union
4556 shouldn't have such things; this function undoes the damage to the
4557 anonymous union type T.
4559 (The reason that we create the synthesized methods is that we don't
4560 distinguish `union { int i; }' from `typedef union { int i; } U'.
4561 The first is an anonymous union; the second is just an ordinary
4565 fixup_anonymous_aggr (tree t
)
4569 /* Wipe out memory of synthesized methods. */
4570 TYPE_HAS_USER_CONSTRUCTOR (t
) = 0;
4571 TYPE_HAS_DEFAULT_CONSTRUCTOR (t
) = 0;
4572 TYPE_HAS_COPY_CTOR (t
) = 0;
4573 TYPE_HAS_CONST_COPY_CTOR (t
) = 0;
4574 TYPE_HAS_COPY_ASSIGN (t
) = 0;
4575 TYPE_HAS_CONST_COPY_ASSIGN (t
) = 0;
4577 /* Splice the implicitly generated functions out of the TYPE_METHODS
4579 q
= &TYPE_METHODS (t
);
4582 if (DECL_ARTIFICIAL (*q
))
4583 *q
= TREE_CHAIN (*q
);
4585 q
= &DECL_CHAIN (*q
);
4588 /* ISO C++ 9.5.3. Anonymous unions may not have function members. */
4589 if (TYPE_METHODS (t
))
4591 tree decl
= TYPE_MAIN_DECL (t
);
4593 if (TREE_CODE (t
) != UNION_TYPE
)
4594 error_at (DECL_SOURCE_LOCATION (decl
),
4595 "an anonymous struct cannot have function members");
4597 error_at (DECL_SOURCE_LOCATION (decl
),
4598 "an anonymous union cannot have function members");
4601 /* Anonymous aggregates cannot have fields with ctors, dtors or complex
4602 assignment operators (because they cannot have these methods themselves).
4603 For anonymous unions this is already checked because they are not allowed
4604 in any union, otherwise we have to check it. */
4605 if (TREE_CODE (t
) != UNION_TYPE
)
4609 for (field
= TYPE_FIELDS (t
); field
; field
= DECL_CHAIN (field
))
4610 if (TREE_CODE (field
) == FIELD_DECL
)
4612 type
= TREE_TYPE (field
);
4613 if (CLASS_TYPE_P (type
))
4615 if (TYPE_NEEDS_CONSTRUCTING (type
))
4616 error ("member %q+#D with constructor not allowed "
4617 "in anonymous aggregate", field
);
4618 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type
))
4619 error ("member %q+#D with destructor not allowed "
4620 "in anonymous aggregate", field
);
4621 if (TYPE_HAS_COMPLEX_COPY_ASSIGN (type
))
4622 error ("member %q+#D with copy assignment operator "
4623 "not allowed in anonymous aggregate", field
);
4629 /* Warn for an attribute located at LOCATION that appertains to the
4630 class type CLASS_TYPE that has not been properly placed after its
4631 class-key, in it class-specifier. */
4634 warn_misplaced_attr_for_class_type (source_location location
,
4637 gcc_assert (OVERLOAD_TYPE_P (class_type
));
4639 if (warning_at (location
, OPT_Wattributes
,
4640 "attribute ignored in declaration "
4641 "of %q#T", class_type
))
4643 "attribute for %q#T must follow the %qs keyword",
4644 class_type
, class_key_or_enum_as_string (class_type
));
4647 /* Make sure that a declaration with no declarator is well-formed, i.e.
4648 just declares a tagged type or anonymous union.
4650 Returns the type declared; or NULL_TREE if none. */
4653 check_tag_decl (cp_decl_specifier_seq
*declspecs
,
4654 bool explicit_type_instantiation_p
)
4656 int saw_friend
= decl_spec_seq_has_spec_p (declspecs
, ds_friend
);
4657 int saw_typedef
= decl_spec_seq_has_spec_p (declspecs
, ds_typedef
);
4658 /* If a class, struct, or enum type is declared by the DECLSPECS
4659 (i.e, if a class-specifier, enum-specifier, or non-typename
4660 elaborated-type-specifier appears in the DECLSPECS),
4661 DECLARED_TYPE is set to the corresponding type. */
4662 tree declared_type
= NULL_TREE
;
4663 bool error_p
= false;
4665 if (declspecs
->multiple_types_p
)
4666 error ("multiple types in one declaration");
4667 else if (declspecs
->redefined_builtin_type
)
4669 if (!in_system_header_at (input_location
))
4670 permerror (declspecs
->locations
[ds_redefined_builtin_type_spec
],
4671 "redeclaration of C++ built-in type %qT",
4672 declspecs
->redefined_builtin_type
);
4677 && TYPE_P (declspecs
->type
)
4678 && ((TREE_CODE (declspecs
->type
) != TYPENAME_TYPE
4679 && MAYBE_CLASS_TYPE_P (declspecs
->type
))
4680 || TREE_CODE (declspecs
->type
) == ENUMERAL_TYPE
))
4681 declared_type
= declspecs
->type
;
4682 else if (declspecs
->type
== error_mark_node
)
4684 if (declared_type
== NULL_TREE
&& ! saw_friend
&& !error_p
)
4685 permerror (input_location
, "declaration does not declare anything");
4686 else if (declared_type
!= NULL_TREE
&& type_uses_auto (declared_type
))
4688 error_at (declspecs
->locations
[ds_type_spec
],
4689 "%<auto%> can only be specified for variables "
4690 "or function declarations");
4691 return error_mark_node
;
4693 /* Check for an anonymous union. */
4694 else if (declared_type
&& RECORD_OR_UNION_CODE_P (TREE_CODE (declared_type
))
4695 && TYPE_UNNAMED_P (declared_type
))
4697 /* 7/3 In a simple-declaration, the optional init-declarator-list
4698 can be omitted only when declaring a class (clause 9) or
4699 enumeration (7.2), that is, when the decl-specifier-seq contains
4700 either a class-specifier, an elaborated-type-specifier with
4701 a class-key (9.1), or an enum-specifier. In these cases and
4702 whenever a class-specifier or enum-specifier is present in the
4703 decl-specifier-seq, the identifiers in these specifiers are among
4704 the names being declared by the declaration (as class-name,
4705 enum-names, or enumerators, depending on the syntax). In such
4706 cases, and except for the declaration of an unnamed bit-field (9.6),
4707 the decl-specifier-seq shall introduce one or more names into the
4708 program, or shall redeclare a name introduced by a previous
4709 declaration. [Example:
4710 enum { }; // ill-formed
4711 typedef class { }; // ill-formed
4715 error ("missing type-name in typedef-declaration");
4718 /* Anonymous unions are objects, so they can have specifiers. */;
4719 SET_ANON_AGGR_TYPE_P (declared_type
);
4721 if (TREE_CODE (declared_type
) != UNION_TYPE
4722 && !in_system_header_at (input_location
))
4723 pedwarn (input_location
, OPT_Wpedantic
, "ISO C++ prohibits anonymous structs");
4728 if (decl_spec_seq_has_spec_p (declspecs
, ds_inline
))
4729 error_at (declspecs
->locations
[ds_inline
],
4730 "%<inline%> can only be specified for functions");
4731 else if (decl_spec_seq_has_spec_p (declspecs
, ds_virtual
))
4732 error_at (declspecs
->locations
[ds_virtual
],
4733 "%<virtual%> can only be specified for functions");
4735 && (!current_class_type
4736 || current_scope () != current_class_type
))
4737 error_at (declspecs
->locations
[ds_friend
],
4738 "%<friend%> can only be specified inside a class");
4739 else if (decl_spec_seq_has_spec_p (declspecs
, ds_explicit
))
4740 error_at (declspecs
->locations
[ds_explicit
],
4741 "%<explicit%> can only be specified for constructors");
4742 else if (declspecs
->storage_class
)
4743 error_at (declspecs
->locations
[ds_storage_class
],
4744 "a storage class can only be specified for objects "
4746 else if (decl_spec_seq_has_spec_p (declspecs
, ds_const
))
4747 error_at (declspecs
->locations
[ds_const
],
4748 "%<const%> can only be specified for objects and "
4750 else if (decl_spec_seq_has_spec_p (declspecs
, ds_volatile
))
4751 error_at (declspecs
->locations
[ds_volatile
],
4752 "%<volatile%> can only be specified for objects and "
4754 else if (decl_spec_seq_has_spec_p (declspecs
, ds_restrict
))
4755 error_at (declspecs
->locations
[ds_restrict
],
4756 "%<__restrict%> can only be specified for objects and "
4758 else if (decl_spec_seq_has_spec_p (declspecs
, ds_thread
))
4759 error_at (declspecs
->locations
[ds_thread
],
4760 "%<__thread%> can only be specified for objects "
4762 else if (saw_typedef
)
4763 warning_at (declspecs
->locations
[ds_typedef
], 0,
4764 "%<typedef%> was ignored in this declaration");
4765 else if (decl_spec_seq_has_spec_p (declspecs
, ds_constexpr
))
4766 error_at (declspecs
->locations
[ds_constexpr
],
4767 "%<constexpr%> cannot be used for type declarations");
4770 if (declspecs
->attributes
&& warn_attributes
&& declared_type
)
4773 if (!CLASS_TYPE_P (declared_type
)
4774 || !CLASSTYPE_TEMPLATE_INSTANTIATION (declared_type
))
4775 /* For a non-template class, use the name location. */
4776 loc
= location_of (declared_type
);
4778 /* For a template class (an explicit instantiation), use the
4779 current location. */
4780 loc
= input_location
;
4782 if (explicit_type_instantiation_p
)
4783 /* [dcl.attr.grammar]/4:
4785 No attribute-specifier-seq shall appertain to an explicit
4788 if (warning_at (loc
, OPT_Wattributes
,
4789 "attribute ignored in explicit instantiation %q#T",
4792 "no attribute can be applied to "
4793 "an explicit instantiation");
4796 warn_misplaced_attr_for_class_type (loc
, declared_type
);
4799 return declared_type
;
4802 /* Called when a declaration is seen that contains no names to declare.
4803 If its type is a reference to a structure, union or enum inherited
4804 from a containing scope, shadow that tag name for the current scope
4805 with a forward reference.
4806 If its type defines a new named structure or union
4807 or defines an enum, it is valid but we need not do anything here.
4808 Otherwise, it is an error.
4810 C++: may have to grok the declspecs to learn about static,
4811 complain for anonymous unions.
4813 Returns the TYPE declared -- or NULL_TREE if none. */
4816 shadow_tag (cp_decl_specifier_seq
*declspecs
)
4818 tree t
= check_tag_decl (declspecs
,
4819 /*explicit_type_instantiation_p=*/false);
4824 if (maybe_process_partial_specialization (t
) == error_mark_node
)
4827 /* This is where the variables in an anonymous union are
4828 declared. An anonymous union declaration looks like:
4830 because there is no declarator after the union, the parser
4831 sends that declaration here. */
4832 if (ANON_AGGR_TYPE_P (t
))
4834 fixup_anonymous_aggr (t
);
4836 if (TYPE_FIELDS (t
))
4838 tree decl
= grokdeclarator (/*declarator=*/NULL
,
4839 declspecs
, NORMAL
, 0, NULL
);
4840 finish_anon_union (decl
);
4847 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
4850 groktypename (cp_decl_specifier_seq
*type_specifiers
,
4851 const cp_declarator
*declarator
,
4852 bool is_template_arg
)
4856 enum decl_context context
4857 = is_template_arg
? TEMPLATE_TYPE_ARG
: TYPENAME
;
4858 attrs
= type_specifiers
->attributes
;
4859 type_specifiers
->attributes
= NULL_TREE
;
4860 type
= grokdeclarator (declarator
, type_specifiers
, context
, 0, &attrs
);
4861 if (attrs
&& type
!= error_mark_node
)
4863 if (CLASS_TYPE_P (type
))
4864 warning (OPT_Wattributes
, "ignoring attributes applied to class type %qT "
4865 "outside of definition", type
);
4866 else if (MAYBE_CLASS_TYPE_P (type
))
4867 /* A template type parameter or other dependent type. */
4868 warning (OPT_Wattributes
, "ignoring attributes applied to dependent "
4869 "type %qT without an associated declaration", type
);
4871 cplus_decl_attributes (&type
, attrs
, 0);
4876 /* Process a DECLARATOR for a function-scope variable declaration,
4877 namespace-scope variable declaration, or function declaration.
4878 (Function definitions go through start_function; class member
4879 declarations appearing in the body of the class go through
4880 grokfield.) The DECL corresponding to the DECLARATOR is returned.
4881 If an error occurs, the error_mark_node is returned instead.
4883 DECLSPECS are the decl-specifiers for the declaration. INITIALIZED is
4884 SD_INITIALIZED if an explicit initializer is present, or SD_DEFAULTED
4885 for an explicitly defaulted function, or SD_DELETED for an explicitly
4886 deleted function, but 0 (SD_UNINITIALIZED) if this is a variable
4887 implicitly initialized via a default constructor. ATTRIBUTES and
4888 PREFIX_ATTRIBUTES are GNU attributes associated with this declaration.
4890 The scope represented by the context of the returned DECL is pushed
4891 (if it is not the global namespace) and is assigned to
4892 *PUSHED_SCOPE_P. The caller is then responsible for calling
4893 pop_scope on *PUSHED_SCOPE_P if it is set. */
4896 start_decl (const cp_declarator
*declarator
,
4897 cp_decl_specifier_seq
*declspecs
,
4900 tree prefix_attributes
,
4901 tree
*pushed_scope_p
)
4909 *pushed_scope_p
= NULL_TREE
;
4911 /* An object declared as __attribute__((deprecated)) suppresses
4912 warnings of uses of other deprecated items. */
4913 if (lookup_attribute ("deprecated", attributes
))
4914 deprecated_state
= DEPRECATED_SUPPRESS
;
4916 attributes
= chainon (attributes
, prefix_attributes
);
4918 decl
= grokdeclarator (declarator
, declspecs
, NORMAL
, initialized
,
4921 deprecated_state
= DEPRECATED_NORMAL
;
4923 if (decl
== NULL_TREE
|| VOID_TYPE_P (decl
)
4924 || decl
== error_mark_node
)
4925 return error_mark_node
;
4927 context
= CP_DECL_CONTEXT (decl
);
4928 if (context
!= global_namespace
)
4929 *pushed_scope_p
= push_scope (context
);
4931 /* Is it valid for this decl to have an initializer at all?
4932 If not, set INITIALIZED to zero, which will indirectly
4933 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
4935 && TREE_CODE (decl
) == TYPE_DECL
)
4937 error ("typedef %qD is initialized (use decltype instead)", decl
);
4938 return error_mark_node
;
4943 if (! toplevel_bindings_p ()
4944 && DECL_EXTERNAL (decl
))
4945 warning (0, "declaration of %q#D has %<extern%> and is initialized",
4947 DECL_EXTERNAL (decl
) = 0;
4948 if (toplevel_bindings_p ())
4949 TREE_STATIC (decl
) = 1;
4951 alias
= lookup_attribute ("alias", DECL_ATTRIBUTES (decl
)) != 0;
4953 if (alias
&& TREE_CODE (decl
) == FUNCTION_DECL
)
4954 record_key_method_defined (decl
);
4956 /* If this is a typedef that names the class for linkage purposes
4957 (7.1.3p8), apply any attributes directly to the type. */
4958 if (TREE_CODE (decl
) == TYPE_DECL
4959 && OVERLOAD_TYPE_P (TREE_TYPE (decl
))
4960 && decl
== TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (decl
))))
4961 flags
= ATTR_FLAG_TYPE_IN_PLACE
;
4965 /* Set attributes here so if duplicate decl, will have proper attributes. */
4966 cplus_decl_attributes (&decl
, attributes
, flags
);
4968 /* Dllimported symbols cannot be defined. Static data members (which
4969 can be initialized in-class and dllimported) go through grokfield,
4970 not here, so we don't need to exclude those decls when checking for
4972 if (initialized
&& DECL_DLLIMPORT_P (decl
))
4974 error ("definition of %q#D is marked %<dllimport%>", decl
);
4975 DECL_DLLIMPORT_P (decl
) = 0;
4978 /* If #pragma weak was used, mark the decl weak now. */
4979 if (!processing_template_decl
)
4980 maybe_apply_pragma_weak (decl
);
4982 if (TREE_CODE (decl
) == FUNCTION_DECL
4983 && DECL_DECLARED_INLINE_P (decl
)
4984 && DECL_UNINLINABLE (decl
)
4985 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl
)))
4986 warning_at (DECL_SOURCE_LOCATION (decl
), 0,
4987 "inline function %qD given attribute noinline", decl
);
4989 if (TYPE_P (context
) && COMPLETE_TYPE_P (complete_type (context
)))
4991 bool this_tmpl
= (processing_template_decl
4992 > template_class_depth (context
));
4995 tree field
= lookup_field (context
, DECL_NAME (decl
), 0, false);
4996 if (field
== NULL_TREE
4997 || !(VAR_P (field
) || variable_template_p (field
)))
4998 error ("%q+#D is not a static data member of %q#T", decl
, context
);
4999 else if (variable_template_p (field
) && !this_tmpl
)
5001 if (DECL_LANG_SPECIFIC (decl
)
5002 && DECL_TEMPLATE_SPECIALIZATION (decl
))
5003 /* OK, specialization was already checked. */;
5006 error_at (DECL_SOURCE_LOCATION (decl
),
5007 "non-member-template declaration of %qD", decl
);
5008 inform (DECL_SOURCE_LOCATION (field
), "does not match "
5009 "member template declaration here");
5010 return error_mark_node
;
5015 if (variable_template_p (field
))
5016 field
= DECL_TEMPLATE_RESULT (field
);
5018 if (DECL_CONTEXT (field
) != context
)
5020 if (!same_type_p (DECL_CONTEXT (field
), context
))
5021 permerror (input_location
, "ISO C++ does not permit %<%T::%D%> "
5022 "to be defined as %<%T::%D%>",
5023 DECL_CONTEXT (field
), DECL_NAME (decl
),
5024 context
, DECL_NAME (decl
));
5025 DECL_CONTEXT (decl
) = DECL_CONTEXT (field
);
5027 /* Static data member are tricky; an in-class initialization
5028 still doesn't provide a definition, so the in-class
5029 declaration will have DECL_EXTERNAL set, but will have an
5030 initialization. Thus, duplicate_decls won't warn
5031 about this situation, and so we check here. */
5032 if (initialized
&& DECL_INITIALIZED_IN_CLASS_P (field
))
5033 error ("duplicate initialization of %qD", decl
);
5034 if (duplicate_decls (decl
, field
, /*newdecl_is_friend=*/false))
5036 if (decl_spec_seq_has_spec_p (declspecs
, ds_constexpr
)
5037 && !DECL_DECLARED_CONSTEXPR_P (field
))
5038 error ("%qD declared %<constexpr%> outside its class", field
);
5043 tree field
= check_classfn (context
, decl
,
5045 ? current_template_parms
5047 if (field
&& field
!= error_mark_node
5048 && duplicate_decls (decl
, field
,
5049 /*newdecl_is_friend=*/false))
5053 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
5054 DECL_IN_AGGR_P (decl
) = 0;
5055 /* Do not mark DECL as an explicit specialization if it was not
5056 already marked as an instantiation; a declaration should
5057 never be marked as a specialization unless we know what
5058 template is being specialized. */
5059 if (DECL_LANG_SPECIFIC (decl
) && DECL_USE_TEMPLATE (decl
))
5061 SET_DECL_TEMPLATE_SPECIALIZATION (decl
);
5062 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5063 DECL_COMDAT (decl
) = (TREE_PUBLIC (decl
)
5064 && DECL_DECLARED_INLINE_P (decl
));
5066 DECL_COMDAT (decl
) = false;
5068 /* [temp.expl.spec] An explicit specialization of a static data
5069 member of a template is a definition if the declaration
5070 includes an initializer; otherwise, it is a declaration.
5072 We check for processing_specialization so this only applies
5073 to the new specialization syntax. */
5074 if (!initialized
&& processing_specialization
)
5075 DECL_EXTERNAL (decl
) = 1;
5078 if (DECL_EXTERNAL (decl
) && ! DECL_TEMPLATE_SPECIALIZATION (decl
)
5079 /* Aliases are definitions. */
5081 permerror (input_location
, "declaration of %q#D outside of class is not definition",
5085 was_public
= TREE_PUBLIC (decl
);
5087 /* Enter this declaration into the symbol table. Don't push the plain
5088 VAR_DECL for a variable template. */
5089 if (!template_parm_scope_p ()
5091 decl
= maybe_push_decl (decl
);
5093 if (processing_template_decl
)
5094 decl
= push_template_decl (decl
);
5095 if (decl
== error_mark_node
)
5096 return error_mark_node
;
5099 && DECL_NAMESPACE_SCOPE_P (decl
) && !TREE_PUBLIC (decl
) && !was_public
5100 && !DECL_THIS_STATIC (decl
) && !DECL_ARTIFICIAL (decl
))
5102 /* This is a const variable with implicit 'static'. Set
5103 DECL_THIS_STATIC so we can tell it from variables that are
5104 !TREE_PUBLIC because of the anonymous namespace. */
5105 gcc_assert (CP_TYPE_CONST_P (TREE_TYPE (decl
)) || errorcount
);
5106 DECL_THIS_STATIC (decl
) = 1;
5109 if (current_function_decl
&& VAR_P (decl
)
5110 && DECL_DECLARED_CONSTEXPR_P (current_function_decl
))
5113 if (CP_DECL_THREAD_LOCAL_P (decl
))
5114 error ("%qD declared %<thread_local%> in %<constexpr%> function",
5116 else if (TREE_STATIC (decl
))
5117 error ("%qD declared %<static%> in %<constexpr%> function", decl
);
5121 cp_function_chain
->invalid_constexpr
= true;
5124 if (!processing_template_decl
&& VAR_P (decl
))
5125 start_decl_1 (decl
, initialized
);
5130 /* Process the declaration of a variable DECL. INITIALIZED is true
5131 iff DECL is explicitly initialized. (INITIALIZED is false if the
5132 variable is initialized via an implicitly-called constructor.)
5133 This function must be called for ordinary variables (including, for
5134 example, implicit instantiations of templates), but must not be
5135 called for template declarations. */
5138 start_decl_1 (tree decl
, bool initialized
)
5142 bool aggregate_definition_p
;
5144 gcc_assert (!processing_template_decl
);
5146 if (error_operand_p (decl
))
5149 gcc_assert (VAR_P (decl
));
5151 type
= TREE_TYPE (decl
);
5152 complete_p
= COMPLETE_TYPE_P (type
);
5153 aggregate_definition_p
= MAYBE_CLASS_TYPE_P (type
) && !DECL_EXTERNAL (decl
);
5155 /* If an explicit initializer is present, or if this is a definition
5156 of an aggregate, then we need a complete type at this point.
5157 (Scalars are always complete types, so there is nothing to
5158 check.) This code just sets COMPLETE_P; errors (if necessary)
5159 are issued below. */
5160 if ((initialized
|| aggregate_definition_p
)
5162 && COMPLETE_TYPE_P (complete_type (type
)))
5165 /* We will not yet have set TREE_READONLY on DECL if the type
5166 was "const", but incomplete, before this point. But, now, we
5167 have a complete type, so we can try again. */
5168 cp_apply_type_quals_to_decl (cp_type_quals (type
), decl
);
5172 /* Is it valid for this decl to have an initializer at all? */
5174 /* Don't allow initializations for incomplete types except for
5175 arrays which might be completed by the initialization. */
5177 ; /* A complete type is ok. */
5178 else if (type_uses_auto (type
))
5179 ; /* An auto type is ok. */
5180 else if (TREE_CODE (type
) != ARRAY_TYPE
)
5182 error ("variable %q#D has initializer but incomplete type", decl
);
5183 type
= TREE_TYPE (decl
) = error_mark_node
;
5185 else if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type
))))
5187 if (DECL_LANG_SPECIFIC (decl
) && DECL_TEMPLATE_INFO (decl
))
5188 error ("elements of array %q#D have incomplete type", decl
);
5189 /* else we already gave an error in start_decl. */
5192 else if (aggregate_definition_p
&& !complete_p
)
5194 if (type_uses_auto (type
))
5197 error ("aggregate %q#D has incomplete type and cannot be defined",
5199 /* Change the type so that assemble_variable will give
5200 DECL an rtl we can live with: (mem (const_int 0)). */
5201 type
= TREE_TYPE (decl
) = error_mark_node
;
5204 /* Create a new scope to hold this declaration if necessary.
5205 Whether or not a new scope is necessary cannot be determined
5206 until after the type has been completed; if the type is a
5207 specialization of a class template it is not until after
5208 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
5209 will be set correctly. */
5210 maybe_push_cleanup_level (type
);
5213 /* Handle initialization of references. DECL, TYPE, and INIT have the
5214 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
5215 but will be set to a new CLEANUP_STMT if a temporary is created
5216 that must be destroyed subsequently.
5218 Returns an initializer expression to use to initialize DECL, or
5219 NULL if the initialization can be performed statically.
5221 Quotes on semantics can be found in ARM 8.4.3. */
5224 grok_reference_init (tree decl
, tree type
, tree init
, int flags
)
5226 if (init
== NULL_TREE
)
5228 if ((DECL_LANG_SPECIFIC (decl
) == 0
5229 || DECL_IN_AGGR_P (decl
) == 0)
5230 && ! DECL_THIS_EXTERN (decl
))
5231 error ("%qD declared as reference but not initialized", decl
);
5235 if (TREE_CODE (init
) == TREE_LIST
)
5236 init
= build_x_compound_expr_from_list (init
, ELK_INIT
,
5237 tf_warning_or_error
);
5239 tree ttype
= TREE_TYPE (type
);
5240 if (TREE_CODE (ttype
) != ARRAY_TYPE
5241 && TREE_CODE (TREE_TYPE (init
)) == ARRAY_TYPE
)
5242 /* Note: default conversion is only called in very special cases. */
5243 init
= decay_conversion (init
, tf_warning_or_error
);
5245 /* check_initializer handles this for non-reference variables, but for
5246 references we need to do it here or the initializer will get the
5247 incomplete array type and confuse later calls to
5248 cp_complete_array_type. */
5249 if (TREE_CODE (ttype
) == ARRAY_TYPE
5250 && TYPE_DOMAIN (ttype
) == NULL_TREE
5251 && (BRACE_ENCLOSED_INITIALIZER_P (init
)
5252 || TREE_CODE (init
) == STRING_CST
))
5254 cp_complete_array_type (&ttype
, init
, false);
5255 if (ttype
!= TREE_TYPE (type
))
5256 type
= cp_build_reference_type (ttype
, TYPE_REF_IS_RVALUE (type
));
5259 /* Convert INIT to the reference type TYPE. This may involve the
5260 creation of a temporary, whose lifetime must be the same as that
5261 of the reference. If so, a DECL_EXPR for the temporary will be
5262 added just after the DECL_EXPR for DECL. That's why we don't set
5263 DECL_INITIAL for local references (instead assigning to them
5264 explicitly); we need to allow the temporary to be initialized
5266 return initialize_reference (type
, init
, flags
,
5267 tf_warning_or_error
);
5270 /* Designated initializers in arrays are not supported in GNU C++.
5271 The parser cannot detect this error since it does not know whether
5272 a given brace-enclosed initializer is for a class type or for an
5273 array. This function checks that CE does not use a designated
5274 initializer. If it does, an error is issued. Returns true if CE
5275 is valid, i.e., does not have a designated initializer. */
5278 check_array_designated_initializer (constructor_elt
*ce
,
5279 unsigned HOST_WIDE_INT index
)
5281 /* Designated initializers for array elements are not supported. */
5284 /* The parser only allows identifiers as designated
5286 if (ce
->index
== error_mark_node
)
5288 error ("name used in a GNU-style designated "
5289 "initializer for an array");
5292 else if (identifier_p (ce
->index
))
5294 error ("name %qD used in a GNU-style designated "
5295 "initializer for an array", ce
->index
);
5299 tree ce_index
= build_expr_type_conversion (WANT_INT
| WANT_ENUM
,
5302 && INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (ce_index
))
5303 && (TREE_CODE (ce_index
= maybe_constant_value (ce_index
))
5306 /* A C99 designator is OK if it matches the current index. */
5307 if (wi::eq_p (ce_index
, index
))
5310 sorry ("non-trivial designated initializers not supported");
5313 error ("C99 designator %qE is not an integral constant-expression",
5322 /* When parsing `int a[] = {1, 2};' we don't know the size of the
5323 array until we finish parsing the initializer. If that's the
5324 situation we're in, update DECL accordingly. */
5327 maybe_deduce_size_from_array_init (tree decl
, tree init
)
5329 tree type
= TREE_TYPE (decl
);
5331 if (TREE_CODE (type
) == ARRAY_TYPE
5332 && TYPE_DOMAIN (type
) == NULL_TREE
5333 && TREE_CODE (decl
) != TYPE_DECL
)
5335 /* do_default is really a C-ism to deal with tentative definitions.
5336 But let's leave it here to ease the eventual merge. */
5337 int do_default
= !DECL_EXTERNAL (decl
);
5338 tree initializer
= init
? init
: DECL_INITIAL (decl
);
5341 /* Check that there are no designated initializers in INIT, as
5342 those are not supported in GNU C++, and as the middle-end
5343 will crash if presented with a non-numeric designated
5345 if (initializer
&& BRACE_ENCLOSED_INITIALIZER_P (initializer
))
5347 vec
<constructor_elt
, va_gc
> *v
= CONSTRUCTOR_ELTS (initializer
);
5348 constructor_elt
*ce
;
5350 FOR_EACH_VEC_SAFE_ELT (v
, i
, ce
)
5351 if (!check_array_designated_initializer (ce
, i
))
5357 failure
= cp_complete_array_type (&TREE_TYPE (decl
), initializer
,
5361 error_at (EXPR_LOC_OR_LOC (initializer
,
5362 DECL_SOURCE_LOCATION (decl
)),
5363 "initializer fails to determine size of %qD", decl
);
5365 else if (failure
== 2)
5369 error_at (DECL_SOURCE_LOCATION (decl
),
5370 "array size missing in %qD", decl
);
5372 /* If a `static' var's size isn't known, make it extern as
5373 well as static, so it does not get allocated. If it's not
5374 `static', then don't mark it extern; finish_incomplete_decl
5375 will give it a default size and it will get allocated. */
5376 else if (!pedantic
&& TREE_STATIC (decl
) && !TREE_PUBLIC (decl
))
5377 DECL_EXTERNAL (decl
) = 1;
5379 else if (failure
== 3)
5381 error_at (DECL_SOURCE_LOCATION (decl
),
5382 "zero-size array %qD", decl
);
5386 cp_apply_type_quals_to_decl (cp_type_quals (TREE_TYPE (decl
)), decl
);
5388 relayout_decl (decl
);
5392 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
5393 any appropriate error messages regarding the layout. */
5396 layout_var_decl (tree decl
)
5400 type
= TREE_TYPE (decl
);
5401 if (type
== error_mark_node
)
5404 /* If we haven't already laid out this declaration, do so now.
5405 Note that we must not call complete type for an external object
5406 because it's type might involve templates that we are not
5407 supposed to instantiate yet. (And it's perfectly valid to say
5408 `extern X x' for some incomplete type `X'.) */
5409 if (!DECL_EXTERNAL (decl
))
5410 complete_type (type
);
5411 if (!DECL_SIZE (decl
)
5412 && TREE_TYPE (decl
) != error_mark_node
5413 && complete_or_array_type_p (type
))
5414 layout_decl (decl
, 0);
5416 if (!DECL_EXTERNAL (decl
) && DECL_SIZE (decl
) == NULL_TREE
)
5418 /* An automatic variable with an incomplete type: that is an error.
5419 Don't talk about array types here, since we took care of that
5420 message in grokdeclarator. */
5421 error_at (DECL_SOURCE_LOCATION (decl
),
5422 "storage size of %qD isn%'t known", decl
);
5423 TREE_TYPE (decl
) = error_mark_node
;
5426 /* Keep this code around in case we later want to control debug info
5427 based on whether a type is "used". (jason 1999-11-11) */
5429 else if (!DECL_EXTERNAL (decl
) && MAYBE_CLASS_TYPE_P (ttype
))
5430 /* Let debugger know it should output info for this type. */
5431 note_debug_info_needed (ttype
);
5433 if (TREE_STATIC (decl
) && DECL_CLASS_SCOPE_P (decl
))
5434 note_debug_info_needed (DECL_CONTEXT (decl
));
5437 if ((DECL_EXTERNAL (decl
) || TREE_STATIC (decl
))
5438 && DECL_SIZE (decl
) != NULL_TREE
5439 && ! TREE_CONSTANT (DECL_SIZE (decl
)))
5441 if (TREE_CODE (DECL_SIZE (decl
)) == INTEGER_CST
)
5442 constant_expression_warning (DECL_SIZE (decl
));
5445 error_at (DECL_SOURCE_LOCATION (decl
),
5446 "storage size of %qD isn%'t constant", decl
);
5447 TREE_TYPE (decl
) = error_mark_node
;
5452 /* If a local static variable is declared in an inline function, or if
5453 we have a weak definition, we must endeavor to create only one
5454 instance of the variable at link-time. */
5457 maybe_commonize_var (tree decl
)
5459 /* Static data in a function with comdat linkage also has comdat
5461 if ((TREE_STATIC (decl
)
5462 /* Don't mess with __FUNCTION__. */
5463 && ! DECL_ARTIFICIAL (decl
)
5464 && DECL_FUNCTION_SCOPE_P (decl
)
5465 && vague_linkage_p (DECL_CONTEXT (decl
)))
5466 || (TREE_PUBLIC (decl
) && DECL_INLINE_VAR_P (decl
)))
5470 /* With weak symbols, we simply make the variable COMDAT;
5471 that will cause copies in multiple translations units to
5473 comdat_linkage (decl
);
5477 if (DECL_INITIAL (decl
) == NULL_TREE
5478 || DECL_INITIAL (decl
) == error_mark_node
)
5480 /* Without weak symbols, we can use COMMON to merge
5481 uninitialized variables. */
5482 TREE_PUBLIC (decl
) = 1;
5483 DECL_COMMON (decl
) = 1;
5487 /* While for initialized variables, we must use internal
5488 linkage -- which means that multiple copies will not
5490 TREE_PUBLIC (decl
) = 0;
5491 DECL_COMMON (decl
) = 0;
5493 if (DECL_INLINE_VAR_P (decl
))
5494 msg
= G_("sorry: semantics of inline variable "
5495 "%q#D are wrong (you%'ll wind up with "
5496 "multiple copies)");
5498 msg
= G_("sorry: semantics of inline function "
5499 "static data %q#D are wrong (you%'ll wind "
5500 "up with multiple copies)");
5501 if (warning_at (DECL_SOURCE_LOCATION (decl
), 0,
5503 inform (DECL_SOURCE_LOCATION (decl
),
5504 "you can work around this by removing the initializer");
5510 /* Issue an error message if DECL is an uninitialized const variable. */
5513 check_for_uninitialized_const_var (tree decl
)
5515 tree type
= strip_array_types (TREE_TYPE (decl
));
5517 /* ``Unless explicitly declared extern, a const object does not have
5518 external linkage and must be initialized. ($8.4; $12.1)'' ARM
5521 && TREE_CODE (type
) != REFERENCE_TYPE
5522 && (CP_TYPE_CONST_P (type
) || var_in_constexpr_fn (decl
))
5523 && !DECL_INITIAL (decl
))
5525 tree field
= default_init_uninitialized_part (type
);
5529 if (CP_TYPE_CONST_P (type
))
5530 permerror (DECL_SOURCE_LOCATION (decl
),
5531 "uninitialized const %qD", decl
);
5534 error_at (DECL_SOURCE_LOCATION (decl
),
5535 "uninitialized variable %qD in %<constexpr%> function",
5537 cp_function_chain
->invalid_constexpr
= true;
5540 if (CLASS_TYPE_P (type
))
5542 tree defaulted_ctor
;
5544 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (type
)),
5545 "%q#T has no user-provided default constructor", type
);
5546 defaulted_ctor
= in_class_defaulted_default_constructor (type
);
5548 inform (DECL_SOURCE_LOCATION (defaulted_ctor
),
5549 "constructor is not user-provided because it is "
5550 "explicitly defaulted in the class body");
5551 inform (DECL_SOURCE_LOCATION (field
),
5552 "and the implicitly-defined constructor does not "
5553 "initialize %q#D", field
);
5558 /* Structure holding the current initializer being processed by reshape_init.
5559 CUR is a pointer to the current element being processed, END is a pointer
5560 after the last element present in the initializer. */
5563 constructor_elt
*cur
;
5564 constructor_elt
*end
;
5567 static tree
reshape_init_r (tree
, reshape_iter
*, bool, tsubst_flags_t
);
5569 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
5570 returned is the next FIELD_DECL (possibly FIELD itself) that can be
5571 initialized. If there are no more such fields, the return value
5575 next_initializable_field (tree field
)
5578 && (TREE_CODE (field
) != FIELD_DECL
5579 || (DECL_C_BIT_FIELD (field
) && !DECL_NAME (field
))
5580 || (DECL_ARTIFICIAL (field
)
5581 && !(cxx_dialect
>= cxx1z
&& DECL_FIELD_IS_BASE (field
)))))
5582 field
= DECL_CHAIN (field
);
5587 /* Return true for [dcl.init.list] direct-list-initialization from
5588 single element of enumeration with a fixed underlying type. */
5591 is_direct_enum_init (tree type
, tree init
)
5593 if (cxx_dialect
>= cxx1z
5594 && TREE_CODE (type
) == ENUMERAL_TYPE
5595 && ENUM_FIXED_UNDERLYING_TYPE_P (type
)
5596 && TREE_CODE (init
) == CONSTRUCTOR
5597 && CONSTRUCTOR_IS_DIRECT_INIT (init
)
5598 && CONSTRUCTOR_NELTS (init
) == 1)
5603 /* Subroutine of reshape_init_array and reshape_init_vector, which does
5604 the actual work. ELT_TYPE is the element type of the array. MAX_INDEX is an
5605 INTEGER_CST representing the size of the array minus one (the maximum index),
5606 or NULL_TREE if the array was declared without specifying the size. D is
5607 the iterator within the constructor. */
5610 reshape_init_array_1 (tree elt_type
, tree max_index
, reshape_iter
*d
,
5611 tsubst_flags_t complain
)
5614 bool sized_array_p
= (max_index
&& TREE_CONSTANT (max_index
));
5615 unsigned HOST_WIDE_INT max_index_cst
= 0;
5616 unsigned HOST_WIDE_INT index
;
5618 /* The initializer for an array is always a CONSTRUCTOR. */
5619 new_init
= build_constructor (init_list_type_node
, NULL
);
5623 /* Minus 1 is used for zero sized arrays. */
5624 if (integer_all_onesp (max_index
))
5627 if (tree_fits_uhwi_p (max_index
))
5628 max_index_cst
= tree_to_uhwi (max_index
);
5629 /* sizetype is sign extended, not zero extended. */
5631 max_index_cst
= tree_to_uhwi (fold_convert (size_type_node
, max_index
));
5634 /* Loop until there are no more initializers. */
5636 d
->cur
!= d
->end
&& (!sized_array_p
|| index
<= max_index_cst
);
5640 constructor_elt
*old_cur
= d
->cur
;
5642 check_array_designated_initializer (d
->cur
, index
);
5643 elt_init
= reshape_init_r (elt_type
, d
, /*first_initializer_p=*/false,
5645 if (elt_init
== error_mark_node
)
5646 return error_mark_node
;
5647 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init
),
5648 size_int (index
), elt_init
);
5649 if (!TREE_CONSTANT (elt_init
))
5650 TREE_CONSTANT (new_init
) = false;
5652 /* This can happen with an invalid initializer (c++/54501). */
5653 if (d
->cur
== old_cur
&& !sized_array_p
)
5660 /* Subroutine of reshape_init_r, processes the initializers for arrays.
5661 Parameters are the same of reshape_init_r. */
5664 reshape_init_array (tree type
, reshape_iter
*d
, tsubst_flags_t complain
)
5666 tree max_index
= NULL_TREE
;
5668 gcc_assert (TREE_CODE (type
) == ARRAY_TYPE
);
5670 if (TYPE_DOMAIN (type
))
5671 max_index
= array_type_nelts (type
);
5673 return reshape_init_array_1 (TREE_TYPE (type
), max_index
, d
, complain
);
5676 /* Subroutine of reshape_init_r, processes the initializers for vectors.
5677 Parameters are the same of reshape_init_r. */
5680 reshape_init_vector (tree type
, reshape_iter
*d
, tsubst_flags_t complain
)
5682 tree max_index
= NULL_TREE
;
5684 gcc_assert (VECTOR_TYPE_P (type
));
5686 if (COMPOUND_LITERAL_P (d
->cur
->value
))
5688 tree value
= d
->cur
->value
;
5689 if (!same_type_p (TREE_TYPE (value
), type
))
5691 if (complain
& tf_error
)
5692 error ("invalid type %qT as initializer for a vector of type %qT",
5693 TREE_TYPE (d
->cur
->value
), type
);
5694 value
= error_mark_node
;
5700 /* For a vector, we initialize it as an array of the appropriate size. */
5701 if (VECTOR_TYPE_P (type
))
5702 max_index
= size_int (TYPE_VECTOR_SUBPARTS (type
) - 1);
5704 return reshape_init_array_1 (TREE_TYPE (type
), max_index
, d
, complain
);
5707 /* Subroutine of reshape_init_r, processes the initializers for classes
5708 or union. Parameters are the same of reshape_init_r. */
5711 reshape_init_class (tree type
, reshape_iter
*d
, bool first_initializer_p
,
5712 tsubst_flags_t complain
)
5717 gcc_assert (CLASS_TYPE_P (type
));
5719 /* The initializer for a class is always a CONSTRUCTOR. */
5720 new_init
= build_constructor (init_list_type_node
, NULL
);
5721 field
= next_initializable_field (TYPE_FIELDS (type
));
5727 An initializer for an aggregate member that is an
5728 empty class shall have the form of an empty
5729 initializer-list {}. */
5730 if (!first_initializer_p
)
5732 if (complain
& tf_error
)
5733 error ("initializer for %qT must be brace-enclosed", type
);
5734 return error_mark_node
;
5739 /* Loop through the initializable fields, gathering initializers. */
5740 while (d
->cur
!= d
->end
)
5743 constructor_elt
*old_cur
= d
->cur
;
5745 /* Handle designated initializers, as an extension. */
5748 if (d
->cur
->index
== error_mark_node
)
5749 return error_mark_node
;
5751 if (TREE_CODE (d
->cur
->index
) == FIELD_DECL
)
5752 /* We already reshaped this. */
5753 gcc_assert (d
->cur
->index
== field
);
5754 else if (TREE_CODE (d
->cur
->index
) == IDENTIFIER_NODE
)
5755 field
= lookup_field_1 (type
, d
->cur
->index
, /*want_type=*/false);
5758 if (complain
& tf_error
)
5759 error ("%<[%E] =%> used in a GNU-style designated initializer"
5760 " for class %qT", d
->cur
->index
, type
);
5761 return error_mark_node
;
5764 if (!field
|| TREE_CODE (field
) != FIELD_DECL
)
5766 if (complain
& tf_error
)
5767 error ("%qT has no non-static data member named %qD", type
,
5769 return error_mark_node
;
5773 /* If we processed all the member of the class, we are done. */
5777 field_init
= reshape_init_r (TREE_TYPE (field
), d
,
5778 /*first_initializer_p=*/false, complain
);
5779 if (field_init
== error_mark_node
)
5780 return error_mark_node
;
5782 if (d
->cur
== old_cur
&& d
->cur
->index
)
5784 /* This can happen with an invalid initializer for a flexible
5785 array member (c++/54441). */
5786 if (complain
& tf_error
)
5787 error ("invalid initializer for %q#D", field
);
5788 return error_mark_node
;
5791 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init
), field
, field_init
);
5795 When a union is initialized with a brace-enclosed
5796 initializer, the braces shall only contain an
5797 initializer for the first member of the union. */
5798 if (TREE_CODE (type
) == UNION_TYPE
)
5801 field
= next_initializable_field (DECL_CHAIN (field
));
5807 /* Subroutine of reshape_init_r. We're in a context where C99 initializer
5808 designators are not valid; either complain or return true to indicate
5809 that reshape_init_r should return error_mark_node. */
5812 has_designator_problem (reshape_iter
*d
, tsubst_flags_t complain
)
5816 if (complain
& tf_error
)
5817 error ("C99 designator %qE outside aggregate initializer",
5825 /* Subroutine of reshape_init, which processes a single initializer (part of
5826 a CONSTRUCTOR). TYPE is the type of the variable being initialized, D is the
5827 iterator within the CONSTRUCTOR which points to the initializer to process.
5828 FIRST_INITIALIZER_P is true if this is the first initializer of the
5829 outermost CONSTRUCTOR node. */
5832 reshape_init_r (tree type
, reshape_iter
*d
, bool first_initializer_p
,
5833 tsubst_flags_t complain
)
5835 tree init
= d
->cur
->value
;
5837 if (error_operand_p (init
))
5838 return error_mark_node
;
5840 if (first_initializer_p
&& !CP_AGGREGATE_TYPE_P (type
)
5841 && has_designator_problem (d
, complain
))
5842 return error_mark_node
;
5844 if (TREE_CODE (type
) == COMPLEX_TYPE
)
5846 /* A complex type can be initialized from one or two initializers,
5847 but braces are not elided. */
5849 if (BRACE_ENCLOSED_INITIALIZER_P (init
))
5851 if (CONSTRUCTOR_NELTS (init
) > 2)
5853 if (complain
& tf_error
)
5854 error ("too many initializers for %qT", type
);
5856 return error_mark_node
;
5859 else if (first_initializer_p
&& d
->cur
!= d
->end
)
5861 vec
<constructor_elt
, va_gc
> *v
= 0;
5862 CONSTRUCTOR_APPEND_ELT (v
, NULL_TREE
, init
);
5863 CONSTRUCTOR_APPEND_ELT (v
, NULL_TREE
, d
->cur
->value
);
5864 if (has_designator_problem (d
, complain
))
5865 return error_mark_node
;
5867 init
= build_constructor (init_list_type_node
, v
);
5872 /* A non-aggregate type is always initialized with a single
5874 if (!CP_AGGREGATE_TYPE_P (type
))
5876 /* It is invalid to initialize a non-aggregate type with a
5877 brace-enclosed initializer before C++0x.
5878 We need to check for BRACE_ENCLOSED_INITIALIZER_P here because
5879 of g++.old-deja/g++.mike/p7626.C: a pointer-to-member constant is
5880 a CONSTRUCTOR (with a record type). */
5881 if (TREE_CODE (init
) == CONSTRUCTOR
5882 /* Don't complain about a capture-init. */
5883 && !CONSTRUCTOR_IS_DIRECT_INIT (init
)
5884 && BRACE_ENCLOSED_INITIALIZER_P (init
)) /* p7626.C */
5886 if (SCALAR_TYPE_P (type
))
5888 if (cxx_dialect
< cxx11
5889 /* Isn't value-initialization. */
5890 || CONSTRUCTOR_NELTS (init
) > 0)
5892 if (complain
& tf_error
)
5893 error ("braces around scalar initializer for type %qT",
5895 init
= error_mark_node
;
5899 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS
);
5906 /* "If T is a class type and the initializer list has a single element of
5907 type cv U, where U is T or a class derived from T, the object is
5908 initialized from that element." Even if T is an aggregate. */
5909 if (cxx_dialect
>= cxx11
&& (CLASS_TYPE_P (type
) || VECTOR_TYPE_P (type
))
5910 && first_initializer_p
5911 && d
->end
- d
->cur
== 1
5912 && reference_related_p (type
, TREE_TYPE (init
)))
5920 All implicit type conversions (clause _conv_) are considered when
5921 initializing the aggregate member with an initializer from an
5922 initializer-list. If the initializer can initialize a member,
5923 the member is initialized. Otherwise, if the member is itself a
5924 non-empty subaggregate, brace elision is assumed and the
5925 initializer is considered for the initialization of the first
5926 member of the subaggregate. */
5927 if (TREE_CODE (init
) != CONSTRUCTOR
5928 /* But don't try this for the first initializer, since that would be
5929 looking through the outermost braces; A a2 = { a1 }; is not a
5930 valid aggregate initialization. */
5931 && !first_initializer_p
5932 && (same_type_ignoring_top_level_qualifiers_p (type
, TREE_TYPE (init
))
5933 || can_convert_arg (type
, TREE_TYPE (init
), init
, LOOKUP_NORMAL
,
5940 /* [dcl.init.string]
5942 A char array (whether plain char, signed char, or unsigned char)
5943 can be initialized by a string-literal (optionally enclosed in
5944 braces); a wchar_t array can be initialized by a wide
5945 string-literal (optionally enclosed in braces). */
5946 if (TREE_CODE (type
) == ARRAY_TYPE
5947 && char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (type
))))
5949 tree str_init
= init
;
5951 /* Strip one level of braces if and only if they enclose a single
5952 element (as allowed by [dcl.init.string]). */
5953 if (!first_initializer_p
5954 && TREE_CODE (str_init
) == CONSTRUCTOR
5955 && CONSTRUCTOR_NELTS (str_init
) == 1)
5957 str_init
= (*CONSTRUCTOR_ELTS (str_init
))[0].value
;
5960 /* If it's a string literal, then it's the initializer for the array
5961 as a whole. Otherwise, continue with normal initialization for
5962 array types (one value per array element). */
5963 if (TREE_CODE (str_init
) == STRING_CST
)
5965 if (has_designator_problem (d
, complain
))
5966 return error_mark_node
;
5972 /* The following cases are about aggregates. If we are not within a full
5973 initializer already, and there is not a CONSTRUCTOR, it means that there
5974 is a missing set of braces (that is, we are processing the case for
5975 which reshape_init exists). */
5976 if (!first_initializer_p
)
5978 if (TREE_CODE (init
) == CONSTRUCTOR
)
5980 if (TREE_TYPE (init
) && TYPE_PTRMEMFUNC_P (TREE_TYPE (init
)))
5981 /* There is no need to reshape pointer-to-member function
5982 initializers, as they are always constructed correctly
5983 by the front end. */
5985 else if (COMPOUND_LITERAL_P (init
))
5986 /* For a nested compound literal, there is no need to reshape since
5987 brace elision is not allowed. Even if we decided to allow it,
5988 we should add a call to reshape_init in finish_compound_literal,
5989 before calling digest_init, so changing this code would still
5990 not be necessary. */
5991 gcc_assert (!BRACE_ENCLOSED_INITIALIZER_P (init
));
5995 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init
));
5996 return reshape_init (type
, init
, complain
);
6000 if (complain
& tf_warning
)
6001 warning (OPT_Wmissing_braces
,
6002 "missing braces around initializer for %qT",
6006 /* Dispatch to specialized routines. */
6007 if (CLASS_TYPE_P (type
))
6008 return reshape_init_class (type
, d
, first_initializer_p
, complain
);
6009 else if (TREE_CODE (type
) == ARRAY_TYPE
)
6010 return reshape_init_array (type
, d
, complain
);
6011 else if (VECTOR_TYPE_P (type
))
6012 return reshape_init_vector (type
, d
, complain
);
6017 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
6018 brace-enclosed aggregate initializer.
6020 INIT is the CONSTRUCTOR containing the list of initializers describing
6021 a brace-enclosed initializer for an entity of the indicated aggregate TYPE.
6022 It may not presently match the shape of the TYPE; for example:
6024 struct S { int a; int b; };
6025 struct S a[] = { 1, 2, 3, 4 };
6027 Here INIT will hold a vector of four elements, rather than a
6028 vector of two elements, each itself a vector of two elements. This
6029 routine transforms INIT from the former form into the latter. The
6030 revised CONSTRUCTOR node is returned. */
6033 reshape_init (tree type
, tree init
, tsubst_flags_t complain
)
6035 vec
<constructor_elt
, va_gc
> *v
;
6039 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init
));
6041 v
= CONSTRUCTOR_ELTS (init
);
6043 /* An empty constructor does not need reshaping, and it is always a valid
6045 if (vec_safe_is_empty (v
))
6048 /* Handle [dcl.init.list] direct-list-initialization from
6049 single element of enumeration with a fixed underlying type. */
6050 if (is_direct_enum_init (type
, init
))
6052 tree elt
= CONSTRUCTOR_ELT (init
, 0)->value
;
6053 if (check_narrowing (ENUM_UNDERLYING_TYPE (type
), elt
, complain
))
6054 return cp_build_c_cast (type
, elt
, tf_warning_or_error
);
6056 return error_mark_node
;
6059 /* Recurse on this CONSTRUCTOR. */
6061 d
.end
= d
.cur
+ v
->length ();
6063 new_init
= reshape_init_r (type
, &d
, true, complain
);
6064 if (new_init
== error_mark_node
)
6065 return error_mark_node
;
6067 /* Make sure all the element of the constructor were used. Otherwise,
6068 issue an error about exceeding initializers. */
6071 if (complain
& tf_error
)
6072 error ("too many initializers for %qT", type
);
6074 return error_mark_node
;
6077 if (CONSTRUCTOR_IS_DIRECT_INIT (init
)
6078 && BRACE_ENCLOSED_INITIALIZER_P (new_init
))
6079 CONSTRUCTOR_IS_DIRECT_INIT (new_init
) = true;
6084 /* Verify array initializer. Returns true if errors have been reported. */
6087 check_array_initializer (tree decl
, tree type
, tree init
)
6089 tree element_type
= TREE_TYPE (type
);
6091 /* The array type itself need not be complete, because the
6092 initializer may tell us how many elements are in the array.
6093 But, the elements of the array must be complete. */
6094 if (!COMPLETE_TYPE_P (complete_type (element_type
)))
6097 error_at (DECL_SOURCE_LOCATION (decl
),
6098 "elements of array %q#D have incomplete type", decl
);
6100 error ("elements of array %q#T have incomplete type", type
);
6103 /* A compound literal can't have variable size. */
6105 && ((COMPLETE_TYPE_P (type
) && !TREE_CONSTANT (TYPE_SIZE (type
)))
6106 || !TREE_CONSTANT (TYPE_SIZE (element_type
))))
6108 error ("variable-sized compound literal");
6114 /* Subroutine of check_initializer; args are passed down from that function.
6115 Set stmts_are_full_exprs_p to 1 across a call to build_aggr_init. */
6118 build_aggr_init_full_exprs (tree decl
, tree init
, int flags
)
6121 gcc_assert (stmts_are_full_exprs_p ());
6122 return build_aggr_init (decl
, init
, flags
, tf_warning_or_error
);
6125 /* Verify INIT (the initializer for DECL), and record the
6126 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
6127 grok_reference_init.
6129 If the return value is non-NULL, it is an expression that must be
6130 evaluated dynamically to initialize DECL. */
6133 check_initializer (tree decl
, tree init
, int flags
, vec
<tree
, va_gc
> **cleanups
)
6135 tree type
= TREE_TYPE (decl
);
6136 tree init_code
= NULL
;
6139 /* Things that are going to be initialized need to have complete
6141 TREE_TYPE (decl
) = type
= complete_type (TREE_TYPE (decl
));
6143 if (DECL_HAS_VALUE_EXPR_P (decl
))
6145 /* A variable with DECL_HAS_VALUE_EXPR_P set is just a placeholder,
6146 it doesn't have storage to be initialized. */
6147 gcc_assert (init
== NULL_TREE
);
6151 if (type
== error_mark_node
)
6152 /* We will have already complained. */
6155 if (TREE_CODE (type
) == ARRAY_TYPE
)
6157 if (check_array_initializer (decl
, type
, init
))
6160 else if (!COMPLETE_TYPE_P (type
))
6162 error_at (DECL_SOURCE_LOCATION (decl
),
6163 "%q#D has incomplete type", decl
);
6164 TREE_TYPE (decl
) = error_mark_node
;
6168 /* There is no way to make a variable-sized class type in GNU C++. */
6169 gcc_assert (TREE_CONSTANT (TYPE_SIZE (type
)));
6171 if (init
&& BRACE_ENCLOSED_INITIALIZER_P (init
))
6173 int init_len
= CONSTRUCTOR_NELTS (init
);
6174 if (SCALAR_TYPE_P (type
))
6178 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS
);
6179 init
= build_zero_init (type
, NULL_TREE
, false);
6181 else if (init_len
!= 1 && TREE_CODE (type
) != COMPLEX_TYPE
)
6183 error_at (EXPR_LOC_OR_LOC (init
, DECL_SOURCE_LOCATION (decl
)),
6184 "scalar object %qD requires one element in "
6185 "initializer", decl
);
6186 TREE_TYPE (decl
) = error_mark_node
;
6192 if (TREE_CODE (decl
) == CONST_DECL
)
6194 gcc_assert (TREE_CODE (type
) != REFERENCE_TYPE
);
6196 DECL_INITIAL (decl
) = init
;
6198 gcc_assert (init
!= NULL_TREE
);
6201 else if (!init
&& DECL_REALLY_EXTERN (decl
))
6203 else if (init
|| type_build_ctor_call (type
)
6204 || TREE_CODE (type
) == REFERENCE_TYPE
)
6206 if (TREE_CODE (type
) == REFERENCE_TYPE
)
6208 init
= grok_reference_init (decl
, type
, init
, flags
);
6209 flags
|= LOOKUP_ALREADY_DIGESTED
;
6212 check_for_uninitialized_const_var (decl
);
6213 /* Do not reshape constructors of vectors (they don't need to be
6215 else if (BRACE_ENCLOSED_INITIALIZER_P (init
))
6217 if (is_std_init_list (type
))
6219 init
= perform_implicit_conversion (type
, init
,
6220 tf_warning_or_error
);
6221 flags
|= LOOKUP_ALREADY_DIGESTED
;
6223 else if (TYPE_NON_AGGREGATE_CLASS (type
))
6225 /* Don't reshape if the class has constructors. */
6226 if (cxx_dialect
== cxx98
)
6227 error_at (EXPR_LOC_OR_LOC (init
, DECL_SOURCE_LOCATION (decl
)),
6228 "in C++98 %qD must be initialized by "
6229 "constructor, not by %<{...}%>",
6232 else if (VECTOR_TYPE_P (type
) && TYPE_VECTOR_OPAQUE (type
))
6234 error ("opaque vector types cannot be initialized");
6235 init
= error_mark_node
;
6239 init
= reshape_init (type
, init
, tf_warning_or_error
);
6240 flags
|= LOOKUP_NO_NARROWING
;
6243 else if (TREE_CODE (init
) == TREE_LIST
6244 && TREE_TYPE (init
) != unknown_type_node
6245 && !MAYBE_CLASS_TYPE_P (type
))
6247 gcc_assert (TREE_CODE (decl
) != RESULT_DECL
);
6249 /* We get here with code like `int a (2);' */
6250 init
= build_x_compound_expr_from_list (init
, ELK_INIT
,
6251 tf_warning_or_error
);
6254 /* If DECL has an array type without a specific bound, deduce the
6255 array size from the initializer. */
6256 maybe_deduce_size_from_array_init (decl
, init
);
6257 type
= TREE_TYPE (decl
);
6258 if (type
== error_mark_node
)
6261 if ((type_build_ctor_call (type
) || CLASS_TYPE_P (type
)
6262 || (DECL_DECOMPOSITION_P (decl
) && TREE_CODE (type
) == ARRAY_TYPE
))
6263 && !(flags
& LOOKUP_ALREADY_DIGESTED
)
6264 && !(init
&& BRACE_ENCLOSED_INITIALIZER_P (init
)
6265 && CP_AGGREGATE_TYPE_P (type
)
6266 && (CLASS_TYPE_P (type
)
6267 || !TYPE_NEEDS_CONSTRUCTING (type
)
6268 || type_has_extended_temps (type
))))
6270 init_code
= build_aggr_init_full_exprs (decl
, init
, flags
);
6272 /* A constructor call is a non-trivial initializer even if
6273 it isn't explicitly written. */
6274 if (TREE_SIDE_EFFECTS (init_code
))
6275 DECL_NONTRIVIALLY_INITIALIZED_P (decl
) = true;
6277 /* If this is a constexpr initializer, expand_default_init will
6278 have returned an INIT_EXPR rather than a CALL_EXPR. In that
6279 case, pull the initializer back out and pass it down into
6280 store_init_value. */
6281 while (TREE_CODE (init_code
) == EXPR_STMT
6282 || TREE_CODE (init_code
) == CONVERT_EXPR
)
6283 init_code
= TREE_OPERAND (init_code
, 0);
6284 if (TREE_CODE (init_code
) == INIT_EXPR
)
6286 init
= TREE_OPERAND (init_code
, 1);
6287 init_code
= NULL_TREE
;
6288 /* Don't call digest_init; it's unnecessary and will complain
6289 about aggregate initialization of non-aggregate classes. */
6290 flags
|= LOOKUP_ALREADY_DIGESTED
;
6292 else if (DECL_DECLARED_CONSTEXPR_P (decl
))
6294 /* Declared constexpr, but no suitable initializer; massage
6295 init appropriately so we can pass it into store_init_value
6297 if (CLASS_TYPE_P (type
)
6298 && (!init
|| TREE_CODE (init
) == TREE_LIST
))
6300 init
= build_functional_cast (type
, init
, tf_none
);
6301 if (TREE_CODE (init
) == TARGET_EXPR
)
6302 TARGET_EXPR_DIRECT_INIT_P (init
) = true;
6304 init_code
= NULL_TREE
;
6310 if (init
&& TREE_CODE (init
) != TREE_VEC
)
6312 /* In aggregate initialization of a variable, each element
6313 initialization is a full-expression because there is no
6314 enclosing expression. */
6315 gcc_assert (stmts_are_full_exprs_p ());
6317 init_code
= store_init_value (decl
, init
, cleanups
, flags
);
6319 if (pedantic
&& TREE_CODE (type
) == ARRAY_TYPE
6320 && DECL_INITIAL (decl
)
6321 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
6322 && PAREN_STRING_LITERAL_P (DECL_INITIAL (decl
)))
6323 warning_at (EXPR_LOC_OR_LOC (DECL_INITIAL (decl
),
6324 DECL_SOURCE_LOCATION (decl
)),
6325 0, "array %qD initialized by parenthesized "
6326 "string literal %qE",
6327 decl
, DECL_INITIAL (decl
));
6333 if (CLASS_TYPE_P (core_type
= strip_array_types (type
))
6334 && (CLASSTYPE_READONLY_FIELDS_NEED_INIT (core_type
)
6335 || CLASSTYPE_REF_FIELDS_NEED_INIT (core_type
)))
6336 diagnose_uninitialized_cst_or_ref_member (core_type
, /*using_new=*/false,
6339 check_for_uninitialized_const_var (decl
);
6342 if (init
&& init
!= error_mark_node
)
6343 init_code
= build2 (INIT_EXPR
, type
, decl
, init
);
6347 /* We might have set these in cp_finish_decl. */
6348 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl
) = false;
6349 TREE_CONSTANT (decl
) = false;
6353 && (DECL_IN_AGGR_P (decl
) && !DECL_VAR_DECLARED_INLINE_P (decl
)))
6355 static int explained
= 0;
6357 if (cxx_dialect
< cxx11
)
6358 error ("initializer invalid for static member with constructor");
6359 else if (cxx_dialect
< cxx1z
)
6360 error ("non-constant in-class initialization invalid for static "
6361 "member %qD", decl
);
6363 error ("non-constant in-class initialization invalid for non-inline "
6364 "static member %qD", decl
);
6367 inform (input_location
,
6368 "(an out of class initialization is required)");
6377 /* If DECL is not a local variable, give it RTL. */
6380 make_rtl_for_nonlocal_decl (tree decl
, tree init
, const char* asmspec
)
6382 int toplev
= toplevel_bindings_p ();
6385 /* Set the DECL_ASSEMBLER_NAME for the object. */
6388 /* The `register' keyword, when used together with an
6389 asm-specification, indicates that the variable should be
6390 placed in a particular register. */
6391 if (VAR_P (decl
) && DECL_REGISTER (decl
))
6393 set_user_assembler_name (decl
, asmspec
);
6394 DECL_HARD_REGISTER (decl
) = 1;
6398 if (TREE_CODE (decl
) == FUNCTION_DECL
6399 && DECL_BUILT_IN_CLASS (decl
) == BUILT_IN_NORMAL
)
6400 set_builtin_user_assembler_name (decl
, asmspec
);
6401 set_user_assembler_name (decl
, asmspec
);
6405 /* Handle non-variables up front. */
6408 rest_of_decl_compilation (decl
, toplev
, at_eof
);
6412 /* If we see a class member here, it should be a static data
6414 if (DECL_LANG_SPECIFIC (decl
) && DECL_IN_AGGR_P (decl
))
6416 gcc_assert (TREE_STATIC (decl
));
6417 /* An in-class declaration of a static data member should be
6418 external; it is only a declaration, and not a definition. */
6419 if (init
== NULL_TREE
)
6420 gcc_assert (DECL_EXTERNAL (decl
)
6421 || !TREE_PUBLIC (decl
)
6422 || DECL_INLINE_VAR_P (decl
));
6425 /* We don't create any RTL for local variables. */
6426 if (DECL_FUNCTION_SCOPE_P (decl
) && !TREE_STATIC (decl
))
6429 /* We defer emission of local statics until the corresponding
6430 DECL_EXPR is expanded. But with constexpr its function might never
6431 be expanded, so go ahead and tell cgraph about the variable now. */
6432 defer_p
= ((DECL_FUNCTION_SCOPE_P (decl
)
6433 && !var_in_maybe_constexpr_fn (decl
))
6434 || DECL_VIRTUAL_P (decl
));
6436 /* Defer template instantiations. */
6437 if (DECL_LANG_SPECIFIC (decl
)
6438 && DECL_IMPLICIT_INSTANTIATION (decl
))
6441 /* If we're not deferring, go ahead and assemble the variable. */
6443 rest_of_decl_compilation (decl
, toplev
, at_eof
);
6446 /* walk_tree helper for wrap_temporary_cleanups, below. */
6449 wrap_cleanups_r (tree
*stmt_p
, int *walk_subtrees
, void *data
)
6451 /* Stop at types or full-expression boundaries. */
6452 if (TYPE_P (*stmt_p
)
6453 || TREE_CODE (*stmt_p
) == CLEANUP_POINT_EXPR
)
6459 if (TREE_CODE (*stmt_p
) == TARGET_EXPR
)
6461 tree guard
= (tree
)data
;
6462 tree tcleanup
= TARGET_EXPR_CLEANUP (*stmt_p
);
6464 tcleanup
= build2 (TRY_CATCH_EXPR
, void_type_node
, tcleanup
, guard
);
6465 /* Tell honor_protect_cleanup_actions to handle this as a separate
6467 TRY_CATCH_IS_CLEANUP (tcleanup
) = 1;
6469 TARGET_EXPR_CLEANUP (*stmt_p
) = tcleanup
;
6475 /* We're initializing a local variable which has a cleanup GUARD. If there
6476 are any temporaries used in the initializer INIT of this variable, we
6477 need to wrap their cleanups with TRY_CATCH_EXPR (, GUARD) so that the
6478 variable will be cleaned up properly if one of them throws.
6480 Unfortunately, there's no way to express this properly in terms of
6481 nesting, as the regions for the temporaries overlap the region for the
6482 variable itself; if there are two temporaries, the variable needs to be
6483 the first thing destroyed if either of them throws. However, we only
6484 want to run the variable's cleanup if it actually got constructed. So
6485 we need to guard the temporary cleanups with the variable's cleanup if
6486 they are run on the normal path, but not if they are run on the
6487 exceptional path. We implement this by telling
6488 honor_protect_cleanup_actions to strip the variable cleanup from the
6489 exceptional path. */
6492 wrap_temporary_cleanups (tree init
, tree guard
)
6494 cp_walk_tree_without_duplicates (&init
, wrap_cleanups_r
, (void *)guard
);
6497 /* Generate code to initialize DECL (a local variable). */
6500 initialize_local_var (tree decl
, tree init
)
6502 tree type
= TREE_TYPE (decl
);
6506 gcc_assert (VAR_P (decl
)
6507 || TREE_CODE (decl
) == RESULT_DECL
);
6508 gcc_assert (!TREE_STATIC (decl
));
6510 if (DECL_SIZE (decl
) == NULL_TREE
)
6512 /* If we used it already as memory, it must stay in memory. */
6513 DECL_INITIAL (decl
) = NULL_TREE
;
6514 TREE_ADDRESSABLE (decl
) = TREE_USED (decl
);
6518 if (type
== error_mark_node
)
6521 /* Compute and store the initial value. */
6522 already_used
= TREE_USED (decl
) || TREE_USED (type
);
6523 if (TREE_USED (type
))
6524 DECL_READ_P (decl
) = 1;
6526 /* Generate a cleanup, if necessary. */
6527 cleanup
= cxx_maybe_build_cleanup (decl
, tf_warning_or_error
);
6529 /* Perform the initialization. */
6532 tree rinit
= (TREE_CODE (init
) == INIT_EXPR
6533 ? TREE_OPERAND (init
, 1) : NULL_TREE
);
6534 if (rinit
&& !TREE_SIDE_EFFECTS (rinit
))
6536 /* Stick simple initializers in DECL_INITIAL so that
6537 -Wno-init-self works (c++/34772). */
6538 gcc_assert (TREE_OPERAND (init
, 0) == decl
);
6539 DECL_INITIAL (decl
) = rinit
;
6541 if (warn_init_self
&& TREE_CODE (type
) == REFERENCE_TYPE
)
6545 warning_at (DECL_SOURCE_LOCATION (decl
),
6547 "reference %qD is initialized with itself", decl
);
6552 int saved_stmts_are_full_exprs_p
;
6554 /* If we're only initializing a single object, guard the
6555 destructors of any temporaries used in its initializer with
6556 its destructor. This isn't right for arrays because each
6557 element initialization is a full-expression. */
6558 if (cleanup
&& TREE_CODE (type
) != ARRAY_TYPE
)
6559 wrap_temporary_cleanups (init
, cleanup
);
6561 gcc_assert (building_stmt_list_p ());
6562 saved_stmts_are_full_exprs_p
= stmts_are_full_exprs_p ();
6563 current_stmt_tree ()->stmts_are_full_exprs_p
= 1;
6564 finish_expr_stmt (init
);
6565 current_stmt_tree ()->stmts_are_full_exprs_p
=
6566 saved_stmts_are_full_exprs_p
;
6570 /* Set this to 0 so we can tell whether an aggregate which was
6571 initialized was ever used. Don't do this if it has a
6572 destructor, so we don't complain about the 'resource
6573 allocation is initialization' idiom. Now set
6574 attribute((unused)) on types so decls of that type will be
6575 marked used. (see TREE_USED, above.) */
6576 if (TYPE_NEEDS_CONSTRUCTING (type
)
6578 && TYPE_HAS_TRIVIAL_DESTRUCTOR (type
)
6579 && DECL_NAME (decl
))
6580 TREE_USED (decl
) = 0;
6581 else if (already_used
)
6582 TREE_USED (decl
) = 1;
6585 finish_decl_cleanup (decl
, cleanup
);
6588 /* DECL is a VAR_DECL for a compiler-generated variable with static
6589 storage duration (like a virtual table) whose initializer is a
6590 compile-time constant. Initialize the variable and provide it to the
6594 initialize_artificial_var (tree decl
, vec
<constructor_elt
, va_gc
> *v
)
6597 gcc_assert (DECL_ARTIFICIAL (decl
));
6598 init
= build_constructor (TREE_TYPE (decl
), v
);
6599 gcc_assert (TREE_CODE (init
) == CONSTRUCTOR
);
6600 DECL_INITIAL (decl
) = init
;
6601 DECL_INITIALIZED_P (decl
) = 1;
6602 determine_visibility (decl
);
6603 layout_var_decl (decl
);
6604 maybe_commonize_var (decl
);
6605 make_rtl_for_nonlocal_decl (decl
, init
, /*asmspec=*/NULL
);
6608 /* INIT is the initializer for a variable, as represented by the
6609 parser. Returns true iff INIT is type-dependent. */
6612 type_dependent_init_p (tree init
)
6614 if (TREE_CODE (init
) == TREE_LIST
)
6615 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
6616 return any_type_dependent_elements_p (init
);
6617 else if (TREE_CODE (init
) == CONSTRUCTOR
)
6618 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
6620 vec
<constructor_elt
, va_gc
> *elts
;
6624 elts
= CONSTRUCTOR_ELTS (init
);
6625 nelts
= vec_safe_length (elts
);
6626 for (i
= 0; i
< nelts
; ++i
)
6627 if (type_dependent_init_p ((*elts
)[i
].value
))
6631 /* It must be a simple expression, e.g., int i = 3; */
6632 return type_dependent_expression_p (init
);
6637 /* INIT is the initializer for a variable, as represented by the
6638 parser. Returns true iff INIT is value-dependent. */
6641 value_dependent_init_p (tree init
)
6643 if (TREE_CODE (init
) == TREE_LIST
)
6644 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
6645 return any_value_dependent_elements_p (init
);
6646 else if (TREE_CODE (init
) == CONSTRUCTOR
)
6647 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
6649 vec
<constructor_elt
, va_gc
> *elts
;
6653 elts
= CONSTRUCTOR_ELTS (init
);
6654 nelts
= vec_safe_length (elts
);
6655 for (i
= 0; i
< nelts
; ++i
)
6656 if (value_dependent_init_p ((*elts
)[i
].value
))
6660 /* It must be a simple expression, e.g., int i = 3; */
6661 return value_dependent_expression_p (init
);
6666 // Returns true if a DECL is VAR_DECL with the concept specifier.
6668 is_concept_var (tree decl
)
6670 return (VAR_P (decl
)
6671 // Not all variables have DECL_LANG_SPECIFIC.
6672 && DECL_LANG_SPECIFIC (decl
)
6673 && DECL_DECLARED_CONCEPT_P (decl
));
6676 /* A helper function to be called via walk_tree. If any label exists
6677 under *TP, it is (going to be) forced. Set has_forced_label_in_static. */
6680 notice_forced_label_r (tree
*tp
, int *walk_subtrees
, void *)
6684 if (TREE_CODE (*tp
) == LABEL_DECL
)
6685 cfun
->has_forced_label_in_static
= 1;
6689 /* Finish processing of a declaration;
6690 install its line number and initial value.
6691 If the length of an array type is not known before,
6692 it must be determined now, from the initial value, or it is an error.
6694 INIT is the initializer (if any) for DECL. If INIT_CONST_EXPR_P is
6695 true, then INIT is an integral constant expression.
6697 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
6698 if the (init) syntax was used. */
6701 cp_finish_decl (tree decl
, tree init
, bool init_const_expr_p
,
6702 tree asmspec_tree
, int flags
)
6705 vec
<tree
, va_gc
> *cleanups
= NULL
;
6706 const char *asmspec
= NULL
;
6707 int was_readonly
= 0;
6708 bool var_definition_p
= false;
6711 if (decl
== error_mark_node
)
6716 error ("assignment (not initialization) in declaration");
6720 gcc_assert (TREE_CODE (decl
) != RESULT_DECL
);
6721 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
6722 gcc_assert (TREE_CODE (decl
) != PARM_DECL
);
6724 type
= TREE_TYPE (decl
);
6725 if (type
== error_mark_node
)
6728 /* Warn about register storage specifiers except when in GNU global
6729 or local register variable extension. */
6730 if (VAR_P (decl
) && DECL_REGISTER (decl
) && asmspec_tree
== NULL_TREE
)
6732 if (cxx_dialect
>= cxx1z
)
6733 pedwarn (DECL_SOURCE_LOCATION (decl
), OPT_Wregister
,
6734 "ISO C++1z does not allow %<register%> storage "
6737 warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wregister
,
6738 "%<register%> storage class specifier used");
6741 /* If a name was specified, get the string. */
6742 if (at_namespace_scope_p ())
6743 asmspec_tree
= maybe_apply_renaming_pragma (decl
, asmspec_tree
);
6744 if (asmspec_tree
&& asmspec_tree
!= error_mark_node
)
6745 asmspec
= TREE_STRING_POINTER (asmspec_tree
);
6747 if (current_class_type
6748 && CP_DECL_CONTEXT (decl
) == current_class_type
6749 && TYPE_BEING_DEFINED (current_class_type
)
6750 && !CLASSTYPE_TEMPLATE_INSTANTIATION (current_class_type
)
6751 && (DECL_INITIAL (decl
) || init
))
6752 DECL_INITIALIZED_IN_CLASS_P (decl
) = 1;
6754 if (TREE_CODE (decl
) != FUNCTION_DECL
6755 && (auto_node
= type_uses_auto (type
)))
6758 if (init
== NULL_TREE
)
6760 if (DECL_LANG_SPECIFIC (decl
)
6761 && DECL_TEMPLATE_INSTANTIATION (decl
)
6762 && !DECL_TEMPLATE_INSTANTIATED (decl
))
6764 /* init is null because we're deferring instantiating the
6765 initializer until we need it. Well, we need it now. */
6766 instantiate_decl (decl
, /*defer_ok*/true, /*expl*/false);
6773 if (TREE_CODE (d_init
) == TREE_LIST
6774 && !CLASS_PLACEHOLDER_TEMPLATE (auto_node
))
6775 d_init
= build_x_compound_expr_from_list (d_init
, ELK_INIT
,
6776 tf_warning_or_error
);
6777 d_init
= resolve_nondeduced_context (d_init
, tf_warning_or_error
);
6778 enum auto_deduction_context adc
= adc_variable_type
;
6779 if (VAR_P (decl
) && DECL_DECOMPOSITION_P (decl
))
6780 adc
= adc_decomp_type
;
6781 type
= TREE_TYPE (decl
) = do_auto_deduction (type
, d_init
, auto_node
,
6782 tf_warning_or_error
, adc
);
6783 if (type
== error_mark_node
)
6785 if (TREE_CODE (type
) == FUNCTION_TYPE
)
6787 error ("initializer for %<decltype(auto) %D%> has function type "
6788 "(did you forget the %<()%> ?)", decl
);
6789 TREE_TYPE (decl
) = error_mark_node
;
6792 cp_apply_type_quals_to_decl (cp_type_quals (type
), decl
);
6795 if (!ensure_literal_type_for_constexpr_object (decl
))
6796 DECL_DECLARED_CONSTEXPR_P (decl
) = 0;
6799 && DECL_CLASS_SCOPE_P (decl
)
6800 && DECL_INITIALIZED_IN_CLASS_P (decl
))
6801 check_static_variable_definition (decl
, type
);
6803 if (init
&& TREE_CODE (decl
) == FUNCTION_DECL
)
6806 if (init
== ridpointers
[(int)RID_DELETE
])
6808 /* FIXME check this is 1st decl. */
6809 DECL_DELETED_FN (decl
) = 1;
6810 DECL_DECLARED_INLINE_P (decl
) = 1;
6811 DECL_INITIAL (decl
) = error_mark_node
;
6812 FOR_EACH_CLONE (clone
, decl
)
6814 DECL_DELETED_FN (clone
) = 1;
6815 DECL_DECLARED_INLINE_P (clone
) = 1;
6816 DECL_INITIAL (clone
) = error_mark_node
;
6820 else if (init
== ridpointers
[(int)RID_DEFAULT
])
6822 if (defaultable_fn_check (decl
))
6823 DECL_DEFAULTED_FN (decl
) = 1;
6825 DECL_INITIAL (decl
) = NULL_TREE
;
6829 if (init
&& VAR_P (decl
))
6831 DECL_NONTRIVIALLY_INITIALIZED_P (decl
) = 1;
6832 /* If DECL is a reference, then we want to know whether init is a
6833 reference constant; init_const_expr_p as passed tells us whether
6834 it's an rvalue constant. */
6835 if (TREE_CODE (type
) == REFERENCE_TYPE
)
6836 init_const_expr_p
= potential_constant_expression (init
);
6837 if (init_const_expr_p
)
6839 /* Set these flags now for templates. We'll update the flags in
6840 store_init_value for instantiations. */
6841 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl
) = 1;
6842 if (decl_maybe_constant_var_p (decl
))
6843 TREE_CONSTANT (decl
) = 1;
6847 if (processing_template_decl
)
6849 bool type_dependent_p
;
6851 /* Add this declaration to the statement-tree. */
6852 if (at_function_scope_p ())
6853 add_decl_expr (decl
);
6855 type_dependent_p
= dependent_type_p (type
);
6857 if (check_for_bare_parameter_packs (init
))
6860 DECL_INITIAL (decl
) = NULL_TREE
;
6863 /* Generally, initializers in templates are expanded when the
6864 template is instantiated. But, if DECL is a variable constant
6865 then it can be used in future constant expressions, so its value
6866 must be available. */
6868 if (!VAR_P (decl
) || type_dependent_p
)
6869 /* We can't do anything if the decl has dependent type. */;
6871 && init_const_expr_p
6872 && TREE_CODE (type
) != REFERENCE_TYPE
6873 && decl_maybe_constant_var_p (decl
)
6874 && !type_dependent_init_p (init
)
6875 && !value_dependent_init_p (init
))
6877 /* This variable seems to be a non-dependent constant, so process
6878 its initializer. If check_initializer returns non-null the
6879 initialization wasn't constant after all. */
6881 cleanups
= make_tree_vector ();
6882 init_code
= check_initializer (decl
, init
, flags
, &cleanups
);
6883 if (init_code
== NULL_TREE
)
6885 release_tree_vector (cleanups
);
6887 else if (!init
&& is_concept_var (decl
))
6888 error ("variable concept has no initializer");
6889 else if (!DECL_PRETTY_FUNCTION_P (decl
))
6891 /* Deduce array size even if the initializer is dependent. */
6892 maybe_deduce_size_from_array_init (decl
, init
);
6893 /* And complain about multiple initializers. */
6894 if (init
&& TREE_CODE (init
) == TREE_LIST
&& TREE_CHAIN (init
)
6895 && !MAYBE_CLASS_TYPE_P (type
))
6896 init
= build_x_compound_expr_from_list (init
, ELK_INIT
,
6897 tf_warning_or_error
);
6901 DECL_INITIAL (decl
) = init
;
6905 /* Just store non-static data member initializers for later. */
6906 if (init
&& TREE_CODE (decl
) == FIELD_DECL
)
6907 DECL_INITIAL (decl
) = init
;
6909 /* Take care of TYPE_DECLs up front. */
6910 if (TREE_CODE (decl
) == TYPE_DECL
)
6912 if (type
!= error_mark_node
6913 && MAYBE_CLASS_TYPE_P (type
) && DECL_NAME (decl
))
6915 if (TREE_TYPE (DECL_NAME (decl
)) && TREE_TYPE (decl
) != type
)
6916 warning (0, "shadowing previous type declaration of %q#D", decl
);
6917 set_identifier_type_value (DECL_NAME (decl
), decl
);
6920 /* If we have installed this as the canonical typedef for this
6921 type, and that type has not been defined yet, delay emitting
6922 the debug information for it, as we will emit it later. */
6923 if (TYPE_MAIN_DECL (TREE_TYPE (decl
)) == decl
6924 && !COMPLETE_TYPE_P (TREE_TYPE (decl
)))
6925 TYPE_DECL_SUPPRESS_DEBUG (decl
) = 1;
6927 rest_of_decl_compilation (decl
, DECL_FILE_SCOPE_P (decl
),
6932 /* A reference will be modified here, as it is initialized. */
6933 if (! DECL_EXTERNAL (decl
)
6934 && TREE_READONLY (decl
)
6935 && TREE_CODE (type
) == REFERENCE_TYPE
)
6938 TREE_READONLY (decl
) = 0;
6943 /* If this is a local variable that will need a mangled name,
6944 register it now. We must do this before processing the
6945 initializer for the variable, since the initialization might
6946 require a guard variable, and since the mangled name of the
6947 guard variable will depend on the mangled name of this
6949 if (DECL_FUNCTION_SCOPE_P (decl
)
6950 && TREE_STATIC (decl
)
6951 && !DECL_ARTIFICIAL (decl
))
6953 push_local_name (decl
);
6954 /* Normally has_forced_label_in_static is set during GIMPLE
6955 lowering, but [cd]tors are never actually compiled directly.
6956 We need to set this early so we can deal with the label
6957 address extension. */
6958 if ((DECL_CONSTRUCTOR_P (current_function_decl
)
6959 || DECL_DESTRUCTOR_P (current_function_decl
))
6962 walk_tree (&init
, notice_forced_label_r
, NULL
, NULL
);
6963 add_local_decl (cfun
, decl
);
6965 /* And make sure it's in the symbol table for
6966 c_parse_final_cleanups to find. */
6967 varpool_node::get_create (decl
);
6970 /* Convert the initializer to the type of DECL, if we have not
6971 already initialized DECL. */
6972 if (!DECL_INITIALIZED_P (decl
)
6973 /* If !DECL_EXTERNAL then DECL is being defined. In the
6974 case of a static data member initialized inside the
6975 class-specifier, there can be an initializer even if DECL
6976 is *not* defined. */
6977 && (!DECL_EXTERNAL (decl
) || init
))
6979 cleanups
= make_tree_vector ();
6980 init
= check_initializer (decl
, init
, flags
, &cleanups
);
6986 The memory occupied by any object of static storage
6987 duration is zero-initialized at program startup before
6988 any other initialization takes place.
6990 We cannot create an appropriate initializer until after
6991 the type of DECL is finalized. If DECL_INITIAL is set,
6992 then the DECL is statically initialized, and any
6993 necessary zero-initialization has already been performed. */
6994 if (TREE_STATIC (decl
) && !DECL_INITIAL (decl
))
6995 DECL_INITIAL (decl
) = build_zero_init (TREE_TYPE (decl
),
6996 /*nelts=*/NULL_TREE
,
6997 /*static_storage_p=*/true);
6998 /* Remember that the initialization for this variable has
7000 DECL_INITIALIZED_P (decl
) = 1;
7001 /* This declaration is the definition of this variable,
7002 unless we are initializing a static data member within
7003 the class specifier. */
7004 if (!DECL_EXTERNAL (decl
))
7005 var_definition_p
= true;
7007 /* If the variable has an array type, lay out the type, even if
7008 there is no initializer. It is valid to index through the
7009 array, and we must get TYPE_ALIGN set correctly on the array
7011 else if (TREE_CODE (type
) == ARRAY_TYPE
)
7014 if (TREE_STATIC (decl
)
7015 && !at_function_scope_p ()
7016 && current_function_decl
== NULL
)
7017 /* So decl is a global variable or a static member of a
7018 non local class. Record the types it uses
7019 so that we can decide later to emit debug info for them. */
7020 record_types_used_by_current_var_decl (decl
);
7023 /* Add this declaration to the statement-tree. This needs to happen
7024 after the call to check_initializer so that the DECL_EXPR for a
7025 reference temp is added before the DECL_EXPR for the reference itself. */
7026 if (DECL_FUNCTION_SCOPE_P (decl
))
7028 /* If we're building a variable sized type, and we might be
7029 reachable other than via the top of the current binding
7030 level, then create a new BIND_EXPR so that we deallocate
7031 the object at the right time. */
7034 && !TREE_CONSTANT (DECL_SIZE (decl
))
7035 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list
))
7038 bind
= build3 (BIND_EXPR
, void_type_node
, NULL
, NULL
, NULL
);
7039 TREE_SIDE_EFFECTS (bind
) = 1;
7041 BIND_EXPR_BODY (bind
) = push_stmt_list ();
7043 add_decl_expr (decl
);
7046 /* Let the middle end know about variables and functions -- but not
7047 static data members in uninstantiated class templates. */
7048 if (VAR_OR_FUNCTION_DECL_P (decl
))
7052 layout_var_decl (decl
);
7053 maybe_commonize_var (decl
);
7056 /* This needs to happen after the linkage is set. */
7057 determine_visibility (decl
);
7059 if (var_definition_p
&& TREE_STATIC (decl
))
7061 /* If a TREE_READONLY variable needs initialization
7062 at runtime, it is no longer readonly and we need to
7063 avoid MEM_READONLY_P being set on RTL created for it. */
7066 if (TREE_READONLY (decl
))
7067 TREE_READONLY (decl
) = 0;
7070 else if (was_readonly
)
7071 TREE_READONLY (decl
) = 1;
7073 /* Likewise if it needs destruction. */
7074 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type
))
7075 TREE_READONLY (decl
) = 0;
7078 make_rtl_for_nonlocal_decl (decl
, init
, asmspec
);
7080 /* Check for abstractness of the type. Notice that there is no
7081 need to strip array types here since the check for those types
7082 is already done within create_array_type_for_decl. */
7083 abstract_virtuals_error (decl
, type
);
7085 if (TREE_TYPE (decl
) == error_mark_node
)
7086 /* No initialization required. */
7088 else if (TREE_CODE (decl
) == FUNCTION_DECL
)
7092 if (init
== ridpointers
[(int)RID_DEFAULT
])
7094 /* An out-of-class default definition is defined at
7095 the point where it is explicitly defaulted. */
7096 if (DECL_DELETED_FN (decl
))
7097 maybe_explain_implicit_delete (decl
);
7098 else if (DECL_INITIAL (decl
) == error_mark_node
)
7099 synthesize_method (decl
);
7102 error ("function %q#D is initialized like a variable", decl
);
7104 /* else no initialization required. */
7106 else if (DECL_EXTERNAL (decl
)
7107 && ! (DECL_LANG_SPECIFIC (decl
)
7108 && DECL_NOT_REALLY_EXTERN (decl
)))
7111 DECL_INITIAL (decl
) = init
;
7113 /* A variable definition. */
7114 else if (DECL_FUNCTION_SCOPE_P (decl
) && !TREE_STATIC (decl
))
7115 /* Initialize the local variable. */
7116 initialize_local_var (decl
, init
);
7118 /* If a variable is defined, and then a subsequent
7119 definition with external linkage is encountered, we will
7120 get here twice for the same variable. We want to avoid
7121 calling expand_static_init more than once. For variables
7122 that are not static data members, we can call
7123 expand_static_init only when we actually process the
7124 initializer. It is not legal to redeclare a static data
7125 member, so this issue does not arise in that case. */
7126 else if (var_definition_p
&& TREE_STATIC (decl
))
7127 expand_static_init (decl
, init
);
7130 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
7131 reference, insert it in the statement-tree now. */
7135 FOR_EACH_VEC_ELT (*cleanups
, i
, t
)
7136 push_cleanup (decl
, t
, false);
7137 release_tree_vector (cleanups
);
7141 TREE_READONLY (decl
) = 1;
7143 invoke_plugin_callbacks (PLUGIN_FINISH_DECL
, decl
);
7146 /* For class TYPE return itself or some its bases that contain
7147 any direct non-static data members. Return error_mark_node if an
7148 error has been diagnosed. */
7151 find_decomp_class_base (location_t loc
, tree type
, tree ret
)
7153 bool member_seen
= false;
7154 for (tree field
= TYPE_FIELDS (type
); field
; field
= DECL_CHAIN (field
))
7155 if (TREE_CODE (field
) != FIELD_DECL
|| DECL_ARTIFICIAL (field
))
7159 else if (ANON_AGGR_TYPE_P (TREE_TYPE (field
)))
7161 if (TREE_CODE (TREE_TYPE (field
)) == RECORD_TYPE
)
7162 error_at (loc
, "cannot decompose class type %qT because it has an "
7163 "anonymous struct member", type
);
7165 error_at (loc
, "cannot decompose class type %qT because it has an "
7166 "anonymous union member", type
);
7167 inform (DECL_SOURCE_LOCATION (field
), "declared here");
7168 return error_mark_node
;
7170 else if (TREE_PRIVATE (field
) || TREE_PROTECTED (field
))
7172 error_at (loc
, "cannot decompose non-public member %qD of %qT",
7174 inform (DECL_SOURCE_LOCATION (field
),
7175 TREE_PRIVATE (field
) ? "declared private here"
7176 : "declared protected here");
7177 return error_mark_node
;
7182 tree base_binfo
, binfo
;
7183 tree orig_ret
= ret
;
7187 for (binfo
= TYPE_BINFO (type
), i
= 0;
7188 BINFO_BASE_ITERATE (binfo
, i
, base_binfo
); i
++)
7190 tree t
= find_decomp_class_base (loc
, TREE_TYPE (base_binfo
), ret
);
7191 if (t
== error_mark_node
)
7192 return error_mark_node
;
7197 error_at (loc
, "cannot decompose class type %qT: both it and "
7198 "its base class %qT have non-static data members",
7200 return error_mark_node
;
7202 else if (orig_ret
!= NULL_TREE
)
7205 /* OK, found the same base along another path. We'll complain
7206 in convert_to_base if it's ambiguous. */;
7207 else if (ret
!= NULL_TREE
)
7209 error_at (loc
, "cannot decompose class type %qT: its base "
7210 "classes %qT and %qT have non-static data "
7211 "members", type
, ret
, t
);
7212 return error_mark_node
;
7221 /* Return std::tuple_size<TYPE>::value. */
7224 get_tuple_size (tree type
)
7226 tree args
= make_tree_vec (1);
7227 TREE_VEC_ELT (args
, 0) = type
;
7228 tree inst
= lookup_template_class (get_identifier ("tuple_size"), args
,
7229 /*in_decl*/NULL_TREE
,
7230 /*context*/std_node
,
7231 /*entering_scope*/false, tf_none
);
7232 tree val
= lookup_qualified_name (inst
, get_identifier ("value"),
7233 /*type*/false, /*complain*/false);
7234 if (TREE_CODE (val
) == VAR_DECL
|| TREE_CODE (val
) == CONST_DECL
)
7235 val
= maybe_constant_value (val
);
7236 if (TREE_CODE (val
) == INTEGER_CST
)
7242 /* Return std::tuple_element<I,TYPE>::type. */
7245 get_tuple_element_type (tree type
, unsigned i
)
7247 tree args
= make_tree_vec (2);
7248 TREE_VEC_ELT (args
, 0) = build_int_cst (integer_type_node
, i
);
7249 TREE_VEC_ELT (args
, 1) = type
;
7250 tree inst
= lookup_template_class (get_identifier ("tuple_element"), args
,
7251 /*in_decl*/NULL_TREE
,
7252 /*context*/std_node
,
7253 /*entering_scope*/false,
7254 tf_warning_or_error
);
7255 return make_typename_type (inst
, get_identifier ("type"),
7256 none_type
, tf_warning_or_error
);
7259 /* Return e.get<i>() or get<i>(e). */
7262 get_tuple_decomp_init (tree decl
, unsigned i
)
7264 tree get_id
= get_identifier ("get");
7265 tree targs
= make_tree_vec (1);
7266 TREE_VEC_ELT (targs
, 0) = build_int_cst (integer_type_node
, i
);
7268 tree etype
= TREE_TYPE (decl
);
7269 tree e
= convert_from_reference (decl
);
7271 /* [The id-expression] e is an lvalue if the type of the entity e is an
7272 lvalue reference and an xvalue otherwise. */
7273 if (TREE_CODE (etype
) != REFERENCE_TYPE
7274 || TYPE_REF_IS_RVALUE (etype
))
7277 tree fns
= lookup_qualified_name (TREE_TYPE (e
), get_id
,
7278 /*type*/false, /*complain*/false);
7279 if (fns
!= error_mark_node
)
7281 fns
= lookup_template_function (fns
, targs
);
7282 return build_new_method_call (e
, fns
, /*args*/NULL
,
7283 /*path*/NULL_TREE
, LOOKUP_NORMAL
,
7284 /*fn_p*/NULL
, tf_warning_or_error
);
7288 vec
<tree
,va_gc
> *args
= make_tree_vector_single (e
);
7289 fns
= lookup_template_function (get_id
, targs
);
7290 fns
= perform_koenig_lookup (fns
, args
, tf_warning_or_error
);
7291 return finish_call_expr (fns
, &args
, /*novirt*/false,
7292 /*koenig*/true, tf_warning_or_error
);
7296 /* Finish a decomposition declaration. DECL is the underlying declaration
7297 "e", FIRST is the head of a chain of decls for the individual identifiers
7298 chained through DECL_CHAIN in reverse order and COUNT is the number of
7302 cp_finish_decomp (tree decl
, tree first
, unsigned int count
)
7304 location_t loc
= DECL_SOURCE_LOCATION (decl
);
7305 if (error_operand_p (decl
))
7310 TREE_TYPE (first
) = error_mark_node
;
7311 if (DECL_HAS_VALUE_EXPR_P (first
))
7313 SET_DECL_VALUE_EXPR (first
, NULL_TREE
);
7314 DECL_HAS_VALUE_EXPR_P (first
) = 0;
7316 first
= DECL_CHAIN (first
);
7321 if (type_dependent_expression_p (decl
)
7322 /* This happens for range for when not in templates.
7323 Still add the DECL_VALUE_EXPRs for later processing. */
7324 || (!processing_template_decl
7325 && type_uses_auto (TREE_TYPE (decl
))))
7327 for (unsigned int i
= 0; i
< count
; i
++)
7329 if (!DECL_HAS_VALUE_EXPR_P (first
))
7331 tree v
= build_nt (ARRAY_REF
, decl
,
7332 size_int (count
- i
- 1),
7333 NULL_TREE
, NULL_TREE
);
7334 SET_DECL_VALUE_EXPR (first
, v
);
7335 DECL_HAS_VALUE_EXPR_P (first
) = 1;
7337 if (processing_template_decl
)
7339 retrofit_lang_decl (first
);
7340 SET_DECL_DECOMPOSITION_P (first
);
7342 first
= DECL_CHAIN (first
);
7347 auto_vec
<tree
, 16> v
;
7348 v
.safe_grow (count
);
7350 for (unsigned int i
= 0; i
< count
; i
++, d
= DECL_CHAIN (d
))
7352 v
[count
- i
- 1] = d
;
7353 retrofit_lang_decl (d
);
7354 SET_DECL_DECOMPOSITION_P (d
);
7357 tree type
= TREE_TYPE (decl
);
7360 if (TREE_CODE (type
) == REFERENCE_TYPE
)
7362 /* If e is a constant reference, use the referent directly. */
7363 if (DECL_INITIAL (decl
))
7364 dexp
= DECL_INITIAL (decl
);
7365 dexp
= convert_from_reference (dexp
);
7366 type
= TREE_TYPE (type
);
7369 tree eltype
= NULL_TREE
;
7370 unsigned HOST_WIDE_INT eltscnt
= 0;
7371 if (TREE_CODE (type
) == ARRAY_TYPE
)
7374 nelts
= array_type_nelts_top (type
);
7375 if (nelts
== error_mark_node
)
7377 if (!tree_fits_uhwi_p (nelts
))
7379 error_at (loc
, "cannot decompose variable length array %qT", type
);
7382 eltscnt
= tree_to_uhwi (nelts
);
7383 if (count
!= eltscnt
)
7386 if (count
> eltscnt
)
7387 error_at (loc
, "%u names provided while %qT decomposes into "
7388 "%wu elements", count
, type
, eltscnt
);
7390 error_at (loc
, "only %u names provided while %qT decomposes into "
7391 "%wu elements", count
, type
, eltscnt
);
7394 eltype
= TREE_TYPE (type
);
7395 for (unsigned int i
= 0; i
< count
; i
++)
7397 TREE_TYPE (v
[i
]) = eltype
;
7398 layout_decl (v
[i
], 0);
7400 t
= build4_loc (DECL_SOURCE_LOCATION (v
[i
]), ARRAY_REF
,
7401 eltype
, t
, size_int (i
), NULL_TREE
,
7403 SET_DECL_VALUE_EXPR (v
[i
], t
);
7404 DECL_HAS_VALUE_EXPR_P (v
[i
]) = 1;
7407 /* 2 GNU extensions. */
7408 else if (TREE_CODE (type
) == COMPLEX_TYPE
)
7411 if (count
!= eltscnt
)
7413 eltype
= cp_build_qualified_type (TREE_TYPE (type
), TYPE_QUALS (type
));
7414 for (unsigned int i
= 0; i
< count
; i
++)
7416 TREE_TYPE (v
[i
]) = eltype
;
7417 layout_decl (v
[i
], 0);
7419 t
= build1_loc (DECL_SOURCE_LOCATION (v
[i
]),
7420 i
? IMAGPART_EXPR
: REALPART_EXPR
, eltype
,
7422 SET_DECL_VALUE_EXPR (v
[i
], t
);
7423 DECL_HAS_VALUE_EXPR_P (v
[i
]) = 1;
7426 else if (TREE_CODE (type
) == VECTOR_TYPE
)
7428 eltscnt
= TYPE_VECTOR_SUBPARTS (type
);
7429 if (count
!= eltscnt
)
7431 eltype
= cp_build_qualified_type (TREE_TYPE (type
), TYPE_QUALS (type
));
7432 for (unsigned int i
= 0; i
< count
; i
++)
7434 TREE_TYPE (v
[i
]) = eltype
;
7435 layout_decl (v
[i
], 0);
7437 convert_vector_to_array_for_subscript (DECL_SOURCE_LOCATION (v
[i
]),
7439 t
= build4_loc (DECL_SOURCE_LOCATION (v
[i
]), ARRAY_REF
,
7440 eltype
, t
, size_int (i
), NULL_TREE
,
7442 SET_DECL_VALUE_EXPR (v
[i
], t
);
7443 DECL_HAS_VALUE_EXPR_P (v
[i
]) = 1;
7446 else if (tree tsize
= get_tuple_size (type
))
7448 eltscnt
= tree_to_uhwi (tsize
);
7449 if (count
!= eltscnt
)
7451 for (unsigned i
= 0; i
< count
; ++i
)
7453 location_t sloc
= input_location
;
7454 location_t dloc
= DECL_SOURCE_LOCATION (v
[i
]);
7456 input_location
= dloc
;
7457 tree init
= get_tuple_decomp_init (decl
, i
);
7458 tree eltype
= (init
== error_mark_node
? error_mark_node
7459 : get_tuple_element_type (type
, i
));
7460 input_location
= sloc
;
7462 if (init
== error_mark_node
|| eltype
== error_mark_node
)
7464 inform (dloc
, "in initialization of decomposition variable %qD",
7468 eltype
= cp_build_reference_type (eltype
, !lvalue_p (init
));
7469 TREE_TYPE (v
[i
]) = eltype
;
7470 layout_decl (v
[i
], 0);
7471 if (DECL_HAS_VALUE_EXPR_P (v
[i
]))
7473 /* In this case the names are variables, not just proxies. */
7474 SET_DECL_VALUE_EXPR (v
[i
], NULL_TREE
);
7475 DECL_HAS_VALUE_EXPR_P (v
[i
]) = 0;
7477 cp_finish_decl (v
[i
], init
, /*constexpr*/false,
7478 /*asm*/NULL_TREE
, LOOKUP_NORMAL
);
7481 else if (TREE_CODE (type
) == UNION_TYPE
)
7483 error_at (loc
, "cannot decompose union type %qT", type
);
7486 else if (!CLASS_TYPE_P (type
))
7488 error_at (loc
, "cannot decompose non-array non-class type %qT", type
);
7493 tree btype
= find_decomp_class_base (loc
, type
, NULL_TREE
);
7494 if (btype
== error_mark_node
)
7496 else if (btype
== NULL_TREE
)
7498 error_at (loc
, "cannot decompose class type %qT without non-static "
7499 "data members", type
);
7502 for (tree field
= TYPE_FIELDS (btype
); field
; field
= TREE_CHAIN (field
))
7503 if (TREE_CODE (field
) != FIELD_DECL
|| DECL_ARTIFICIAL (field
))
7507 if (count
!= eltscnt
)
7512 t
= convert_to_base (t
, btype
, /*check_access*/true,
7513 /*nonnull*/false, tf_warning_or_error
);
7517 for (tree field
= TYPE_FIELDS (btype
); field
; field
= TREE_CHAIN (field
))
7518 if (TREE_CODE (field
) != FIELD_DECL
|| DECL_ARTIFICIAL (field
))
7522 tree tt
= finish_non_static_data_member (field
, t
, NULL_TREE
);
7524 if (REFERENCE_REF_P (probe
))
7525 probe
= TREE_OPERAND (probe
, 0);
7526 TREE_TYPE (v
[i
]) = TREE_TYPE (probe
);
7527 layout_decl (v
[i
], 0);
7528 SET_DECL_VALUE_EXPR (v
[i
], tt
);
7529 DECL_HAS_VALUE_EXPR_P (v
[i
]) = 1;
7535 /* Returns a declaration for a VAR_DECL as if:
7537 extern "C" TYPE NAME;
7539 had been seen. Used to create compiler-generated global
7543 declare_global_var (tree name
, tree type
)
7547 push_to_top_level ();
7548 decl
= build_decl (input_location
, VAR_DECL
, name
, type
);
7549 TREE_PUBLIC (decl
) = 1;
7550 DECL_EXTERNAL (decl
) = 1;
7551 DECL_ARTIFICIAL (decl
) = 1;
7552 /* If the user has explicitly declared this variable (perhaps
7553 because the code we are compiling is part of a low-level runtime
7554 library), then it is possible that our declaration will be merged
7555 with theirs by pushdecl. */
7556 decl
= pushdecl (decl
);
7557 cp_finish_decl (decl
, NULL_TREE
, false, NULL_TREE
, 0);
7558 pop_from_top_level ();
7563 /* Returns the type for the argument to "__cxa_atexit" (or "atexit",
7564 if "__cxa_atexit" is not being used) corresponding to the function
7565 to be called when the program exits. */
7568 get_atexit_fn_ptr_type (void)
7572 if (!atexit_fn_ptr_type_node
)
7575 if (flag_use_cxa_atexit
7576 && !targetm
.cxx
.use_atexit_for_cxa_atexit ())
7577 /* The parameter to "__cxa_atexit" is "void (*)(void *)". */
7578 arg_type
= ptr_type_node
;
7580 /* The parameter to "atexit" is "void (*)(void)". */
7581 arg_type
= NULL_TREE
;
7583 fn_type
= build_function_type_list (void_type_node
,
7584 arg_type
, NULL_TREE
);
7585 atexit_fn_ptr_type_node
= build_pointer_type (fn_type
);
7588 return atexit_fn_ptr_type_node
;
7591 /* Returns a pointer to the `atexit' function. Note that if
7592 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
7593 `__cxa_atexit' function specified in the IA64 C++ ABI. */
7596 get_atexit_node (void)
7602 bool use_aeabi_atexit
;
7607 if (flag_use_cxa_atexit
&& !targetm
.cxx
.use_atexit_for_cxa_atexit ())
7609 /* The declaration for `__cxa_atexit' is:
7611 int __cxa_atexit (void (*)(void *), void *, void *)
7613 We build up the argument types and then the function type
7615 tree argtype0
, argtype1
, argtype2
;
7617 use_aeabi_atexit
= targetm
.cxx
.use_aeabi_atexit ();
7618 /* First, build the pointer-to-function type for the first
7620 fn_ptr_type
= get_atexit_fn_ptr_type ();
7621 /* Then, build the rest of the argument types. */
7622 argtype2
= ptr_type_node
;
7623 if (use_aeabi_atexit
)
7625 argtype1
= fn_ptr_type
;
7626 argtype0
= ptr_type_node
;
7630 argtype1
= ptr_type_node
;
7631 argtype0
= fn_ptr_type
;
7633 /* And the final __cxa_atexit type. */
7634 fn_type
= build_function_type_list (integer_type_node
,
7635 argtype0
, argtype1
, argtype2
,
7637 if (use_aeabi_atexit
)
7638 name
= "__aeabi_atexit";
7640 name
= "__cxa_atexit";
7644 /* The declaration for `atexit' is:
7646 int atexit (void (*)());
7648 We build up the argument types and then the function type
7650 fn_ptr_type
= get_atexit_fn_ptr_type ();
7651 /* Build the final atexit type. */
7652 fn_type
= build_function_type_list (integer_type_node
,
7653 fn_ptr_type
, NULL_TREE
);
7657 /* Now, build the function declaration. */
7658 push_lang_context (lang_name_c
);
7659 atexit_fndecl
= build_library_fn_ptr (name
, fn_type
, ECF_LEAF
| ECF_NOTHROW
);
7660 mark_used (atexit_fndecl
);
7661 pop_lang_context ();
7662 atexit_node
= decay_conversion (atexit_fndecl
, tf_warning_or_error
);
7667 /* Like get_atexit_node, but for thread-local cleanups. */
7670 get_thread_atexit_node (void)
7672 /* The declaration for `__cxa_thread_atexit' is:
7674 int __cxa_thread_atexit (void (*)(void *), void *, void *) */
7675 tree fn_type
= build_function_type_list (integer_type_node
,
7676 get_atexit_fn_ptr_type (),
7677 ptr_type_node
, ptr_type_node
,
7680 /* Now, build the function declaration. */
7681 tree atexit_fndecl
= build_library_fn_ptr ("__cxa_thread_atexit", fn_type
,
7682 ECF_LEAF
| ECF_NOTHROW
);
7683 return decay_conversion (atexit_fndecl
, tf_warning_or_error
);
7686 /* Returns the __dso_handle VAR_DECL. */
7689 get_dso_handle_node (void)
7691 if (dso_handle_node
)
7692 return dso_handle_node
;
7694 /* Declare the variable. */
7695 dso_handle_node
= declare_global_var (get_identifier ("__dso_handle"),
7698 #ifdef HAVE_GAS_HIDDEN
7699 if (dso_handle_node
!= error_mark_node
)
7701 DECL_VISIBILITY (dso_handle_node
) = VISIBILITY_HIDDEN
;
7702 DECL_VISIBILITY_SPECIFIED (dso_handle_node
) = 1;
7706 return dso_handle_node
;
7709 /* Begin a new function with internal linkage whose job will be simply
7710 to destroy some particular variable. */
7712 static GTY(()) int start_cleanup_cnt
;
7715 start_cleanup_fn (void)
7720 bool use_cxa_atexit
= flag_use_cxa_atexit
7721 && !targetm
.cxx
.use_atexit_for_cxa_atexit ();
7723 push_to_top_level ();
7725 /* No need to mangle this. */
7726 push_lang_context (lang_name_c
);
7728 /* Build the name of the function. */
7729 sprintf (name
, "__tcf_%d", start_cleanup_cnt
++);
7730 /* Build the function declaration. */
7731 fntype
= TREE_TYPE (get_atexit_fn_ptr_type ());
7732 fndecl
= build_lang_decl (FUNCTION_DECL
, get_identifier (name
), fntype
);
7733 /* It's a function with internal linkage, generated by the
7735 TREE_PUBLIC (fndecl
) = 0;
7736 DECL_ARTIFICIAL (fndecl
) = 1;
7737 /* Make the function `inline' so that it is only emitted if it is
7738 actually needed. It is unlikely that it will be inlined, since
7739 it is only called via a function pointer, but we avoid unnecessary
7740 emissions this way. */
7741 DECL_DECLARED_INLINE_P (fndecl
) = 1;
7742 DECL_INTERFACE_KNOWN (fndecl
) = 1;
7743 /* Build the parameter. */
7748 parmdecl
= cp_build_parm_decl (NULL_TREE
, ptr_type_node
);
7749 DECL_CONTEXT (parmdecl
) = fndecl
;
7750 TREE_USED (parmdecl
) = 1;
7751 DECL_READ_P (parmdecl
) = 1;
7752 DECL_ARGUMENTS (fndecl
) = parmdecl
;
7756 start_preparsed_function (fndecl
, NULL_TREE
, SF_PRE_PARSED
);
7758 pop_lang_context ();
7760 return current_function_decl
;
7763 /* Finish the cleanup function begun by start_cleanup_fn. */
7766 end_cleanup_fn (void)
7768 expand_or_defer_fn (finish_function (0));
7770 pop_from_top_level ();
7773 /* Generate code to handle the destruction of DECL, an object with
7774 static storage duration. */
7777 register_dtor_fn (tree decl
)
7784 bool ob_parm
, dso_parm
, use_dtor
;
7785 tree arg0
, arg1
, arg2
;
7788 type
= TREE_TYPE (decl
);
7789 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type
))
7792 /* If we're using "__cxa_atexit" (or "__cxa_thread_atexit" or
7793 "__aeabi_atexit"), and DECL is a class object, we can just pass the
7794 destructor to "__cxa_atexit"; we don't have to build a temporary
7795 function to do the cleanup. */
7796 dso_parm
= (flag_use_cxa_atexit
7797 && !targetm
.cxx
.use_atexit_for_cxa_atexit ());
7798 ob_parm
= (CP_DECL_THREAD_LOCAL_P (decl
) || dso_parm
);
7799 use_dtor
= ob_parm
&& CLASS_TYPE_P (type
);
7804 /* Find the destructor. */
7805 idx
= lookup_fnfields_1 (type
, complete_dtor_identifier
);
7806 gcc_assert (idx
>= 0);
7807 cleanup
= (*CLASSTYPE_METHOD_VEC (type
))[idx
];
7808 /* Make sure it is accessible. */
7809 perform_or_defer_access_check (TYPE_BINFO (type
), cleanup
, cleanup
,
7810 tf_warning_or_error
);
7814 /* Call build_cleanup before we enter the anonymous function so
7815 that any access checks will be done relative to the current
7816 scope, rather than the scope of the anonymous function. */
7817 build_cleanup (decl
);
7819 /* Now start the function. */
7820 cleanup
= start_cleanup_fn ();
7822 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
7823 to the original function, rather than the anonymous one. That
7824 will make the back end think that nested functions are in use,
7825 which causes confusion. */
7826 push_deferring_access_checks (dk_no_check
);
7827 fcall
= build_cleanup (decl
);
7828 pop_deferring_access_checks ();
7830 /* Create the body of the anonymous function. */
7831 compound_stmt
= begin_compound_stmt (BCS_FN_BODY
);
7832 finish_expr_stmt (fcall
);
7833 finish_compound_stmt (compound_stmt
);
7837 /* Call atexit with the cleanup function. */
7838 mark_used (cleanup
);
7839 cleanup
= build_address (cleanup
);
7841 if (CP_DECL_THREAD_LOCAL_P (decl
))
7842 atex_node
= get_thread_atexit_node ();
7844 atex_node
= get_atexit_node ();
7848 /* We must convert CLEANUP to the type that "__cxa_atexit"
7850 cleanup
= build_nop (get_atexit_fn_ptr_type (), cleanup
);
7851 /* "__cxa_atexit" will pass the address of DECL to the
7852 cleanup function. */
7854 addr
= build_address (decl
);
7855 /* The declared type of the parameter to "__cxa_atexit" is
7856 "void *". For plain "T*", we could just let the
7857 machinery in cp_build_function_call convert it -- but if the
7858 type is "cv-qualified T *", then we need to convert it
7859 before passing it in, to avoid spurious errors. */
7860 addr
= build_nop (ptr_type_node
, addr
);
7863 /* Since the cleanup functions we build ignore the address
7864 they're given, there's no reason to pass the actual address
7865 in, and, in general, it's cheaper to pass NULL than any
7867 addr
= null_pointer_node
;
7870 arg2
= cp_build_addr_expr (get_dso_handle_node (),
7871 tf_warning_or_error
);
7873 /* Just pass NULL to the dso handle parm if we don't actually
7874 have a DSO handle on this target. */
7875 arg2
= null_pointer_node
;
7881 if (!CP_DECL_THREAD_LOCAL_P (decl
)
7882 && targetm
.cxx
.use_aeabi_atexit ())
7898 return cp_build_function_call_nary (atex_node
, tf_warning_or_error
,
7899 arg0
, arg1
, arg2
, NULL_TREE
);
7902 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
7903 is its initializer. Generate code to handle the construction
7904 and destruction of DECL. */
7907 expand_static_init (tree decl
, tree init
)
7909 gcc_assert (VAR_P (decl
));
7910 gcc_assert (TREE_STATIC (decl
));
7912 /* Some variables require no dynamic initialization. */
7913 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl
)))
7915 /* Make sure the destructor is callable. */
7916 cxx_maybe_build_cleanup (decl
, tf_warning_or_error
);
7921 if (CP_DECL_THREAD_LOCAL_P (decl
) && DECL_GNU_TLS_P (decl
)
7922 && !DECL_FUNCTION_SCOPE_P (decl
))
7925 error ("non-local variable %qD declared %<__thread%> "
7926 "needs dynamic initialization", decl
);
7928 error ("non-local variable %qD declared %<__thread%> "
7929 "has a non-trivial destructor", decl
);
7930 static bool informed
;
7933 inform (DECL_SOURCE_LOCATION (decl
),
7934 "C++11 %<thread_local%> allows dynamic initialization "
7941 if (DECL_FUNCTION_SCOPE_P (decl
))
7943 /* Emit code to perform this initialization but once. */
7944 tree if_stmt
= NULL_TREE
, inner_if_stmt
= NULL_TREE
;
7945 tree then_clause
= NULL_TREE
, inner_then_clause
= NULL_TREE
;
7946 tree guard
, guard_addr
;
7948 /* We don't need thread-safety code for thread-local vars. */
7949 bool thread_guard
= (flag_threadsafe_statics
7950 && !CP_DECL_THREAD_LOCAL_P (decl
));
7952 /* Emit code to perform this initialization but once. This code
7955 static <type> guard;
7956 if (!__atomic_load (guard.first_byte)) {
7957 if (__cxa_guard_acquire (&guard)) {
7960 // Do initialization.
7961 flag = true; __cxa_guard_release (&guard);
7962 // Register variable for destruction at end of program.
7964 if (!flag) __cxa_guard_abort (&guard);
7968 Note that the `flag' variable is only set to 1 *after* the
7969 initialization is complete. This ensures that an exception,
7970 thrown during the construction, will cause the variable to
7971 reinitialized when we pass through this code again, as per:
7975 If the initialization exits by throwing an exception, the
7976 initialization is not complete, so it will be tried again
7977 the next time control enters the declaration.
7979 This process should be thread-safe, too; multiple threads
7980 should not be able to initialize the variable more than
7983 /* Create the guard variable. */
7984 guard
= get_guard (decl
);
7986 /* Begin the conditional initialization. */
7987 if_stmt
= begin_if_stmt ();
7989 finish_if_stmt_cond (get_guard_cond (guard
, thread_guard
), if_stmt
);
7990 then_clause
= begin_compound_stmt (BCS_NO_SCOPE
);
7994 tree vfntype
= NULL_TREE
;
7995 tree acquire_name
, release_name
, abort_name
;
7996 tree acquire_fn
, release_fn
, abort_fn
;
7997 guard_addr
= build_address (guard
);
7999 acquire_name
= get_identifier ("__cxa_guard_acquire");
8000 release_name
= get_identifier ("__cxa_guard_release");
8001 abort_name
= get_identifier ("__cxa_guard_abort");
8002 acquire_fn
= identifier_global_value (acquire_name
);
8003 release_fn
= identifier_global_value (release_name
);
8004 abort_fn
= identifier_global_value (abort_name
);
8006 acquire_fn
= push_library_fn
8007 (acquire_name
, build_function_type_list (integer_type_node
,
8008 TREE_TYPE (guard_addr
),
8010 NULL_TREE
, ECF_NOTHROW
| ECF_LEAF
);
8011 if (!release_fn
|| !abort_fn
)
8012 vfntype
= build_function_type_list (void_type_node
,
8013 TREE_TYPE (guard_addr
),
8016 release_fn
= push_library_fn (release_name
, vfntype
, NULL_TREE
,
8017 ECF_NOTHROW
| ECF_LEAF
);
8019 abort_fn
= push_library_fn (abort_name
, vfntype
, NULL_TREE
,
8020 ECF_NOTHROW
| ECF_LEAF
);
8022 inner_if_stmt
= begin_if_stmt ();
8023 finish_if_stmt_cond (build_call_n (acquire_fn
, 1, guard_addr
),
8026 inner_then_clause
= begin_compound_stmt (BCS_NO_SCOPE
);
8027 begin
= get_target_expr (boolean_false_node
);
8028 flag
= TARGET_EXPR_SLOT (begin
);
8030 TARGET_EXPR_CLEANUP (begin
)
8031 = build3 (COND_EXPR
, void_type_node
, flag
,
8033 build_call_n (abort_fn
, 1, guard_addr
));
8034 CLEANUP_EH_ONLY (begin
) = 1;
8036 /* Do the initialization itself. */
8037 init
= add_stmt_to_compound (begin
, init
);
8038 init
= add_stmt_to_compound
8039 (init
, build2 (MODIFY_EXPR
, void_type_node
, flag
, boolean_true_node
));
8040 init
= add_stmt_to_compound
8041 (init
, build_call_n (release_fn
, 1, guard_addr
));
8044 init
= add_stmt_to_compound (init
, set_guard (guard
));
8046 /* Use atexit to register a function for destroying this static
8048 init
= add_stmt_to_compound (init
, register_dtor_fn (decl
));
8050 finish_expr_stmt (init
);
8054 finish_compound_stmt (inner_then_clause
);
8055 finish_then_clause (inner_if_stmt
);
8056 finish_if_stmt (inner_if_stmt
);
8059 finish_compound_stmt (then_clause
);
8060 finish_then_clause (if_stmt
);
8061 finish_if_stmt (if_stmt
);
8063 else if (CP_DECL_THREAD_LOCAL_P (decl
))
8064 tls_aggregates
= tree_cons (init
, decl
, tls_aggregates
);
8066 static_aggregates
= tree_cons (init
, decl
, static_aggregates
);
8070 /* Make TYPE a complete type based on INITIAL_VALUE.
8071 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
8072 2 if there was no information (in which case assume 0 if DO_DEFAULT),
8073 3 if the initializer list is empty (in pedantic mode). */
8076 cp_complete_array_type (tree
*ptype
, tree initial_value
, bool do_default
)
8079 tree type
, elt_type
;
8081 /* Don't get confused by a CONSTRUCTOR for some other type. */
8082 if (initial_value
&& TREE_CODE (initial_value
) == CONSTRUCTOR
8083 && !BRACE_ENCLOSED_INITIALIZER_P (initial_value
)
8084 && TREE_CODE (TREE_TYPE (initial_value
)) != ARRAY_TYPE
)
8089 unsigned HOST_WIDE_INT i
;
8092 /* An array of character type can be initialized from a
8093 brace-enclosed string constant.
8095 FIXME: this code is duplicated from reshape_init. Probably
8096 we should just call reshape_init here? */
8097 if (char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (*ptype
)))
8098 && TREE_CODE (initial_value
) == CONSTRUCTOR
8099 && !vec_safe_is_empty (CONSTRUCTOR_ELTS (initial_value
)))
8101 vec
<constructor_elt
, va_gc
> *v
= CONSTRUCTOR_ELTS (initial_value
);
8102 tree value
= (*v
)[0].value
;
8104 if (TREE_CODE (value
) == STRING_CST
8105 && v
->length () == 1)
8106 initial_value
= value
;
8109 /* If any of the elements are parameter packs, we can't actually
8110 complete this type now because the array size is dependent. */
8111 if (TREE_CODE (initial_value
) == CONSTRUCTOR
)
8113 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (initial_value
),
8116 if (PACK_EXPANSION_P (value
))
8122 failure
= complete_array_type (ptype
, initial_value
, do_default
);
8124 /* We can create the array before the element type is complete, which
8125 means that we didn't have these two bits set in the original type
8126 either. In completing the type, we are expected to propagate these
8127 bits. See also complete_type which does the same thing for arrays
8130 if (TYPE_DOMAIN (type
))
8132 elt_type
= TREE_TYPE (type
);
8133 TYPE_NEEDS_CONSTRUCTING (type
) = TYPE_NEEDS_CONSTRUCTING (elt_type
);
8134 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type
)
8135 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (elt_type
);
8141 /* As above, but either give an error or reject zero-size arrays, depending
8145 cp_complete_array_type_or_error (tree
*ptype
, tree initial_value
,
8146 bool do_default
, tsubst_flags_t complain
)
8149 bool sfinae
= !(complain
& tf_error
);
8150 /* In SFINAE context we can't be lenient about zero-size arrays. */
8153 failure
= cp_complete_array_type (ptype
, initial_value
, do_default
);
8159 /* Not an error. */;
8160 else if (failure
== 1)
8161 error ("initializer fails to determine size of %qT", *ptype
);
8162 else if (failure
== 2)
8165 error ("array size missing in %qT", *ptype
);
8167 else if (failure
== 3)
8168 error ("zero-size array %qT", *ptype
);
8169 *ptype
= error_mark_node
;
8174 /* Return zero if something is declared to be a member of type
8175 CTYPE when in the context of CUR_TYPE. STRING is the error
8176 message to print in that case. Otherwise, quietly return 1. */
8179 member_function_or_else (tree ctype
, tree cur_type
, enum overload_flags flags
)
8181 if (ctype
&& ctype
!= cur_type
)
8183 if (flags
== DTOR_FLAG
)
8184 error ("destructor for alien class %qT cannot be a member", ctype
);
8186 error ("constructor for alien class %qT cannot be a member", ctype
);
8192 /* Subroutine of `grokdeclarator'. */
8194 /* Generate errors possibly applicable for a given set of specifiers.
8195 This is for ARM $7.1.2. */
8198 bad_specifiers (tree object
,
8199 enum bad_spec_place type
,
8210 error ("%qD declared as a %<virtual%> variable", object
);
8212 error ("%<const%> and %<volatile%> function specifiers on "
8213 "%qD invalid in variable declaration", object
);
8217 error ("%qD declared as a %<virtual%> parameter", object
);
8219 error ("%qD declared as an %<inline%> parameter", object
);
8221 error ("%<const%> and %<volatile%> function specifiers on "
8222 "%qD invalid in parameter declaration", object
);
8226 error ("%qD declared as a %<virtual%> type", object
);
8228 error ("%qD declared as an %<inline%> type", object
);
8230 error ("%<const%> and %<volatile%> function specifiers on "
8231 "%qD invalid in type declaration", object
);
8235 error ("%qD declared as a %<virtual%> field", object
);
8237 error ("%qD declared as an %<inline%> field", object
);
8239 error ("%<const%> and %<volatile%> function specifiers on "
8240 "%qD invalid in field declaration", object
);
8246 error ("%q+D declared as a friend", object
);
8248 && !flag_noexcept_type
8249 && (TREE_CODE (object
) == TYPE_DECL
8250 || (!TYPE_PTRFN_P (TREE_TYPE (object
))
8251 && !TYPE_REFFN_P (TREE_TYPE (object
))
8252 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (object
)))))
8253 error ("%q+D declared with an exception specification", object
);
8256 /* DECL is a member function or static data member and is presently
8257 being defined. Check that the definition is taking place in a
8261 check_class_member_definition_namespace (tree decl
)
8263 /* These checks only apply to member functions and static data
8265 gcc_assert (VAR_OR_FUNCTION_DECL_P (decl
));
8266 /* We check for problems with specializations in pt.c in
8267 check_specialization_namespace, where we can issue better
8269 if (processing_specialization
)
8271 /* We check this in check_explicit_instantiation_namespace. */
8272 if (processing_explicit_instantiation
)
8276 A member function definition that appears outside of the
8277 class definition shall appear in a namespace scope enclosing
8278 the class definition.
8282 The definition for a static data member shall appear in a
8283 namespace scope enclosing the member's class definition. */
8284 if (!is_ancestor (current_namespace
, DECL_CONTEXT (decl
)))
8285 permerror (input_location
, "definition of %qD is not in namespace enclosing %qT",
8286 decl
, DECL_CONTEXT (decl
));
8289 /* Build a PARM_DECL for the "this" parameter. TYPE is the
8290 METHOD_TYPE for a non-static member function; QUALS are the
8291 cv-qualifiers that apply to the function. */
8294 build_this_parm (tree type
, cp_cv_quals quals
)
8299 cp_cv_quals this_quals
;
8301 if (CLASS_TYPE_P (type
))
8304 = cp_build_qualified_type (type
, quals
& ~TYPE_QUAL_RESTRICT
);
8305 this_type
= build_pointer_type (this_type
);
8308 this_type
= type_of_this_parm (type
);
8309 /* The `this' parameter is implicitly `const'; it cannot be
8311 this_quals
= (quals
& TYPE_QUAL_RESTRICT
) | TYPE_QUAL_CONST
;
8312 qual_type
= cp_build_qualified_type (this_type
, this_quals
);
8313 parm
= build_artificial_parm (this_identifier
, qual_type
);
8314 cp_apply_type_quals_to_decl (this_quals
, parm
);
8318 /* DECL is a static member function. Complain if it was declared
8319 with function-cv-quals. */
8322 check_static_quals (tree decl
, cp_cv_quals quals
)
8324 if (quals
!= TYPE_UNQUALIFIED
)
8325 error ("static member function %q#D declared with type qualifiers",
8329 // Check that FN takes no arguments and returns bool.
8331 check_concept_fn (tree fn
)
8333 // A constraint is nullary.
8334 if (DECL_ARGUMENTS (fn
))
8335 error ("concept %q#D declared with function parameters", fn
);
8337 // The declared return type of the concept shall be bool, and
8338 // it shall not be deduced from it definition.
8339 tree type
= TREE_TYPE (TREE_TYPE (fn
));
8341 error ("concept %q#D declared with a deduced return type", fn
);
8342 else if (type
!= boolean_type_node
)
8343 error ("concept %q#D with non-%<bool%> return type %qT", fn
, type
);
8346 /* Helper function. Replace the temporary this parameter injected
8347 during cp_finish_omp_declare_simd with the real this parameter. */
8350 declare_simd_adjust_this (tree
*tp
, int *walk_subtrees
, void *data
)
8352 tree this_parm
= (tree
) data
;
8353 if (TREE_CODE (*tp
) == PARM_DECL
8354 && DECL_NAME (*tp
) == this_identifier
8355 && *tp
!= this_parm
)
8357 else if (TYPE_P (*tp
))
8362 /* CTYPE is class type, or null if non-class.
8363 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
8365 DECLARATOR is the function's name.
8366 PARMS is a chain of PARM_DECLs for the function.
8367 VIRTUALP is truthvalue of whether the function is virtual or not.
8368 FLAGS are to be passed through to `grokclassfn'.
8369 QUALS are qualifiers indicating whether the function is `const'
8371 RAISES is a list of exceptions that this function can raise.
8372 CHECK is 1 if we must find this method in CTYPE, 0 if we should
8373 not look, and -1 if we should not call `grokclassfn' at all.
8375 SFK is the kind of special function (if any) for the new function.
8377 Returns `NULL_TREE' if something goes wrong, after issuing
8378 applicable error messages. */
8381 grokfndecl (tree ctype
,
8385 tree orig_declarator
,
8388 enum overload_flags flags
,
8390 cp_ref_qualifier rqual
,
8397 special_function_kind sfk
,
8402 location_t location
)
8405 int staticp
= ctype
&& TREE_CODE (type
) == FUNCTION_TYPE
;
8408 // Was the concept specifier present?
8409 bool concept_p
= inlinep
& 4;
8411 // Concept declarations must have a corresponding definition.
8412 if (concept_p
&& !funcdef_flag
)
8414 error ("concept %qD has no definition", declarator
);
8419 type
= build_ref_qualified_type (type
, rqual
);
8421 type
= build_exception_variant (type
, raises
);
8423 decl
= build_lang_decl (FUNCTION_DECL
, declarator
, type
);
8425 /* Set the constraints on the declaration. */
8428 tree tmpl_reqs
= NULL_TREE
;
8429 if (processing_template_decl
> template_class_depth (ctype
))
8430 tmpl_reqs
= TEMPLATE_PARMS_CONSTRAINTS (current_template_parms
);
8432 /* Adjust the required expression into a constraint. */
8434 decl_reqs
= normalize_expression (decl_reqs
);
8436 tree ci
= build_constraints (tmpl_reqs
, decl_reqs
);
8437 set_constraints (decl
, ci
);
8440 /* If we have an explicit location, use it, otherwise use whatever
8441 build_lang_decl used (probably input_location). */
8442 if (location
!= UNKNOWN_LOCATION
)
8443 DECL_SOURCE_LOCATION (decl
) = location
;
8445 if (TREE_CODE (type
) == METHOD_TYPE
)
8448 parm
= build_this_parm (type
, quals
);
8449 DECL_CHAIN (parm
) = parms
;
8452 /* Allocate space to hold the vptr bit if needed. */
8453 SET_DECL_ALIGN (decl
, MINIMUM_METHOD_BOUNDARY
);
8455 DECL_ARGUMENTS (decl
) = parms
;
8456 for (t
= parms
; t
; t
= DECL_CHAIN (t
))
8457 DECL_CONTEXT (t
) = decl
;
8458 /* Propagate volatile out from type to decl. */
8459 if (TYPE_VOLATILE (type
))
8460 TREE_THIS_VOLATILE (decl
) = 1;
8462 /* Setup decl according to sfk. */
8465 case sfk_constructor
:
8466 case sfk_copy_constructor
:
8467 case sfk_move_constructor
:
8468 DECL_CONSTRUCTOR_P (decl
) = 1;
8470 case sfk_destructor
:
8471 DECL_DESTRUCTOR_P (decl
) = 1;
8478 && TREE_CODE (orig_declarator
) == TEMPLATE_ID_EXPR
)
8482 ("defining explicit specialization %qD in friend declaration",
8486 tree fns
= TREE_OPERAND (orig_declarator
, 0);
8487 tree args
= TREE_OPERAND (orig_declarator
, 1);
8489 if (PROCESSING_REAL_TEMPLATE_DECL_P ())
8491 /* Something like `template <class T> friend void f<T>()'. */
8492 error ("invalid use of template-id %qD in declaration "
8493 "of primary template",
8499 /* A friend declaration of the form friend void f<>(). Record
8500 the information in the TEMPLATE_ID_EXPR. */
8501 SET_DECL_IMPLICIT_INSTANTIATION (decl
);
8503 gcc_assert (identifier_p (fns
) || TREE_CODE (fns
) == OVERLOAD
);
8504 DECL_TEMPLATE_INFO (decl
) = build_template_info (fns
, args
);
8506 for (t
= TYPE_ARG_TYPES (TREE_TYPE (decl
)); t
; t
= TREE_CHAIN (t
))
8507 if (TREE_PURPOSE (t
)
8508 && TREE_CODE (TREE_PURPOSE (t
)) == DEFAULT_ARG
)
8510 error ("default arguments are not allowed in declaration "
8511 "of friend template specialization %qD",
8518 error ("%<inline%> is not allowed in declaration of friend "
8519 "template specialization %qD",
8526 /* If this decl has namespace scope, set that up. */
8528 set_decl_namespace (decl
, in_namespace
, friendp
);
8530 DECL_CONTEXT (decl
) = FROB_CONTEXT (current_decl_namespace ());
8532 /* `main' and builtins have implicit 'C' linkage. */
8533 if ((MAIN_NAME_P (declarator
)
8534 || (IDENTIFIER_LENGTH (declarator
) > 10
8535 && IDENTIFIER_POINTER (declarator
)[0] == '_'
8536 && IDENTIFIER_POINTER (declarator
)[1] == '_'
8537 && strncmp (IDENTIFIER_POINTER (declarator
)+2, "builtin_", 8) == 0)
8538 || (targetcm
.cxx_implicit_extern_c
8539 && targetcm
.cxx_implicit_extern_c(IDENTIFIER_POINTER (declarator
))))
8540 && current_lang_name
== lang_name_cplusplus
8541 && ctype
== NULL_TREE
8542 && DECL_FILE_SCOPE_P (decl
))
8543 SET_DECL_LANGUAGE (decl
, lang_c
);
8545 /* Should probably propagate const out from type to decl I bet (mrs). */
8548 DECL_STATIC_FUNCTION_P (decl
) = 1;
8549 DECL_CONTEXT (decl
) = ctype
;
8553 DECL_DELETED_FN (decl
) = 1;
8557 DECL_CONTEXT (decl
) = ctype
;
8559 check_class_member_definition_namespace (decl
);
8562 if (ctype
== NULL_TREE
&& DECL_MAIN_P (decl
))
8564 if (PROCESSING_REAL_TEMPLATE_DECL_P())
8565 error ("cannot declare %<::main%> to be a template");
8567 error ("cannot declare %<::main%> to be inline");
8569 error ("cannot declare %<::main%> to be constexpr");
8571 error ("cannot declare %<::main%> to be static");
8576 /* Members of anonymous types and local classes have no linkage; make
8577 them internal. If a typedef is made later, this will be changed. */
8578 if (ctype
&& (!TREE_PUBLIC (TYPE_MAIN_DECL (ctype
))
8579 || decl_function_context (TYPE_MAIN_DECL (ctype
))))
8582 if (publicp
&& cxx_dialect
== cxx98
)
8584 /* [basic.link]: A name with no linkage (notably, the name of a class
8585 or enumeration declared in a local scope) shall not be used to
8586 declare an entity with linkage.
8588 DR 757 relaxes this restriction for C++0x. */
8589 no_linkage_error (decl
);
8592 TREE_PUBLIC (decl
) = publicp
;
8595 DECL_INTERFACE_KNOWN (decl
) = 1;
8596 DECL_NOT_REALLY_EXTERN (decl
) = 1;
8599 /* If the declaration was declared inline, mark it as such. */
8602 DECL_DECLARED_INLINE_P (decl
) = 1;
8604 DECL_COMDAT (decl
) = 1;
8607 DECL_DECLARED_CONSTEXPR_P (decl
) = true;
8609 // If the concept declaration specifier was found, check
8610 // that the declaration satisfies the necessary requirements.
8613 DECL_DECLARED_CONCEPT_P (decl
) = true;
8614 check_concept_fn (decl
);
8617 DECL_EXTERNAL (decl
) = 1;
8618 if (TREE_CODE (type
) == FUNCTION_TYPE
)
8621 TREE_TYPE (decl
) = apply_memfn_quals (TREE_TYPE (decl
),
8628 ? G_("static member function %qD cannot have cv-qualifier")
8629 : G_("non-member function %qD cannot have cv-qualifier"),
8631 quals
= TYPE_UNQUALIFIED
;
8637 ? G_("static member function %qD cannot have ref-qualifier")
8638 : G_("non-member function %qD cannot have ref-qualifier"),
8640 rqual
= REF_QUAL_NONE
;
8644 if (deduction_guide_p (decl
))
8646 if (!DECL_NAMESPACE_SCOPE_P (decl
))
8648 error_at (location
, "deduction guide %qD must be declared at "
8649 "namespace scope", decl
);
8652 tree type
= TREE_TYPE (DECL_NAME (decl
));
8653 if (CP_DECL_CONTEXT (decl
) != CP_TYPE_CONTEXT (type
))
8655 error_at (location
, "deduction guide %qD must be declared in the "
8656 "same scope as %qT", decl
, type
);
8657 inform (location_of (type
), " declared here");
8662 "deduction guide %qD must not have a function body", decl
);
8664 else if (IDENTIFIER_OPNAME_P (DECL_NAME (decl
))
8665 && !grok_op_properties (decl
, /*complain=*/true))
8667 else if (UDLIT_OPER_P (DECL_NAME (decl
)))
8669 bool long_long_unsigned_p
;
8671 const char *suffix
= NULL
;
8672 /* [over.literal]/6: Literal operators shall not have C linkage. */
8673 if (DECL_LANGUAGE (decl
) == lang_c
)
8675 error ("literal operator with C linkage");
8679 if (DECL_NAMESPACE_SCOPE_P (decl
))
8681 if (!check_literal_operator_args (decl
, &long_long_unsigned_p
,
8684 error ("%qD has invalid argument list", decl
);
8688 suffix
= UDLIT_OP_SUFFIX (DECL_NAME (decl
));
8689 if (long_long_unsigned_p
)
8691 if (cpp_interpret_int_suffix (parse_in
, suffix
, strlen (suffix
)))
8692 warning (0, "integer suffix %<%s%>"
8693 " shadowed by implementation", suffix
);
8695 else if (long_double_p
)
8697 if (cpp_interpret_float_suffix (parse_in
, suffix
, strlen (suffix
)))
8698 warning (0, "floating point suffix %<%s%>"
8699 " shadowed by implementation", suffix
);
8704 error ("%qD must be a non-member function", decl
);
8710 /* Make the init_value nonzero so pushdecl knows this is not
8711 tentative. error_mark_node is replaced later with the BLOCK. */
8712 DECL_INITIAL (decl
) = error_mark_node
;
8714 if (TYPE_NOTHROW_P (type
) || nothrow_libfn_p (decl
))
8715 TREE_NOTHROW (decl
) = 1;
8717 if (flag_openmp
|| flag_openmp_simd
|| flag_cilkplus
)
8719 /* Adjust "omp declare simd" attributes. */
8720 tree ods
= lookup_attribute ("omp declare simd", *attrlist
);
8724 for (attr
= ods
; attr
;
8725 attr
= lookup_attribute ("omp declare simd", TREE_CHAIN (attr
)))
8727 if (TREE_CODE (type
) == METHOD_TYPE
)
8728 walk_tree (&TREE_VALUE (attr
), declare_simd_adjust_this
,
8729 DECL_ARGUMENTS (decl
), NULL
);
8730 if (TREE_VALUE (attr
) != NULL_TREE
)
8732 tree cl
= TREE_VALUE (TREE_VALUE (attr
));
8733 cl
= c_omp_declare_simd_clauses_to_numbers
8734 (DECL_ARGUMENTS (decl
), cl
);
8736 TREE_VALUE (TREE_VALUE (attr
)) = cl
;
8738 TREE_VALUE (attr
) = NULL_TREE
;
8744 /* Caller will do the rest of this. */
8748 if (ctype
!= NULL_TREE
)
8749 grokclassfn (ctype
, decl
, flags
);
8752 if (cxx_dialect
>= cxx11
8753 && DECL_DESTRUCTOR_P (decl
)
8754 && !TYPE_BEING_DEFINED (DECL_CONTEXT (decl
))
8755 && !processing_template_decl
)
8756 deduce_noexcept_on_destructor (decl
);
8758 decl
= check_explicit_specialization (orig_declarator
, decl
,
8761 4 * (friendp
!= 0) +
8763 if (decl
== error_mark_node
)
8766 if (DECL_STATIC_FUNCTION_P (decl
))
8767 check_static_quals (decl
, quals
);
8771 cplus_decl_attributes (&decl
, *attrlist
, 0);
8772 *attrlist
= NULL_TREE
;
8775 /* Check main's type after attributes have been applied. */
8776 if (ctype
== NULL_TREE
&& DECL_MAIN_P (decl
))
8778 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl
)),
8781 tree oldtypeargs
= TYPE_ARG_TYPES (TREE_TYPE (decl
));
8783 error ("%<::main%> must return %<int%>");
8784 newtype
= build_function_type (integer_type_node
, oldtypeargs
);
8785 TREE_TYPE (decl
) = newtype
;
8788 check_main_parameter_types (decl
);
8791 if (ctype
!= NULL_TREE
&& check
)
8793 tree old_decl
= check_classfn (ctype
, decl
,
8794 (processing_template_decl
8795 > template_class_depth (ctype
))
8796 ? current_template_parms
8799 if (old_decl
== error_mark_node
)
8807 if (TREE_CODE (old_decl
) == TEMPLATE_DECL
)
8808 /* Because grokfndecl is always supposed to return a
8809 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
8810 here. We depend on our callers to figure out that its
8811 really a template that's being returned. */
8812 old_decl
= DECL_TEMPLATE_RESULT (old_decl
);
8814 if (DECL_STATIC_FUNCTION_P (old_decl
)
8815 && TREE_CODE (TREE_TYPE (decl
)) == METHOD_TYPE
)
8817 /* Remove the `this' parm added by grokclassfn. */
8818 revert_static_member_fn (decl
);
8819 check_static_quals (decl
, quals
);
8821 if (DECL_ARTIFICIAL (old_decl
))
8823 error ("definition of implicitly-declared %qD", old_decl
);
8826 else if (DECL_DEFAULTED_FN (old_decl
))
8828 error ("definition of explicitly-defaulted %q+D", decl
);
8829 inform (DECL_SOURCE_LOCATION (old_decl
),
8830 "%q#D explicitly defaulted here", old_decl
);
8834 /* Since we've smashed OLD_DECL to its
8835 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
8836 if (TREE_CODE (decl
) == TEMPLATE_DECL
)
8837 decl
= DECL_TEMPLATE_RESULT (decl
);
8839 /* Attempt to merge the declarations. This can fail, in
8840 the case of some invalid specialization declarations. */
8841 pushed_scope
= push_scope (ctype
);
8842 ok
= duplicate_decls (decl
, old_decl
, friendp
);
8844 pop_scope (pushed_scope
);
8847 error ("no %q#D member function declared in class %qT",
8851 if (ok
== error_mark_node
)
8857 if (DECL_CONSTRUCTOR_P (decl
) && !grok_ctor_properties (ctype
, decl
))
8860 if (ctype
== NULL_TREE
|| check
)
8864 DECL_VIRTUAL_P (decl
) = 1;
8869 /* decl is a FUNCTION_DECL.
8870 specifiers are the parsed virt-specifiers.
8872 Set flags to reflect the virt-specifiers.
8877 set_virt_specifiers (tree decl
, cp_virt_specifiers specifiers
)
8879 if (decl
== NULL_TREE
)
8881 if (specifiers
& VIRT_SPEC_OVERRIDE
)
8882 DECL_OVERRIDE_P (decl
) = 1;
8883 if (specifiers
& VIRT_SPEC_FINAL
)
8884 DECL_FINAL_P (decl
) = 1;
8888 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
8889 the linkage that DECL will receive in the object file. */
8892 set_linkage_for_static_data_member (tree decl
)
8894 /* A static data member always has static storage duration and
8895 external linkage. Note that static data members are forbidden in
8896 local classes -- the only situation in which a class has
8897 non-external linkage. */
8898 TREE_PUBLIC (decl
) = 1;
8899 TREE_STATIC (decl
) = 1;
8900 /* For non-template classes, static data members are always put
8901 out in exactly those files where they are defined, just as
8902 with ordinary namespace-scope variables. */
8903 if (!processing_template_decl
)
8904 DECL_INTERFACE_KNOWN (decl
) = 1;
8907 /* Create a VAR_DECL named NAME with the indicated TYPE.
8909 If SCOPE is non-NULL, it is the class type or namespace containing
8910 the variable. If SCOPE is NULL, the variable should is created in
8911 the innermost enclosing scope. */
8914 grokvardecl (tree type
,
8916 tree orig_declarator
,
8917 const cp_decl_specifier_seq
*declspecs
,
8926 tree explicit_scope
;
8928 gcc_assert (!name
|| identifier_p (name
));
8930 bool constp
= (type_quals
& TYPE_QUAL_CONST
) != 0;
8931 bool volatilep
= (type_quals
& TYPE_QUAL_VOLATILE
) != 0;
8933 /* Compute the scope in which to place the variable, but remember
8934 whether or not that scope was explicitly specified by the user. */
8935 explicit_scope
= scope
;
8938 /* An explicit "extern" specifier indicates a namespace-scope
8940 if (declspecs
->storage_class
== sc_extern
)
8941 scope
= current_decl_namespace ();
8942 else if (!at_function_scope_p ())
8943 scope
= current_scope ();
8947 && (/* If the variable is a namespace-scope variable declared in a
8948 template, we need DECL_LANG_SPECIFIC. */
8949 (TREE_CODE (scope
) == NAMESPACE_DECL
&& processing_template_decl
)
8950 /* Similarly for namespace-scope variables with language linkage
8952 || (TREE_CODE (scope
) == NAMESPACE_DECL
8953 && current_lang_name
!= lang_name_cplusplus
)
8954 /* Similarly for static data members. */
8956 /* Similarly for explicit specializations. */
8958 && TREE_CODE (orig_declarator
) == TEMPLATE_ID_EXPR
)))
8959 decl
= build_lang_decl (VAR_DECL
, name
, type
);
8961 decl
= build_decl (input_location
, VAR_DECL
, name
, type
);
8963 if (explicit_scope
&& TREE_CODE (explicit_scope
) == NAMESPACE_DECL
)
8964 set_decl_namespace (decl
, explicit_scope
, 0);
8966 DECL_CONTEXT (decl
) = FROB_CONTEXT (scope
);
8968 if (declspecs
->storage_class
== sc_extern
)
8970 DECL_THIS_EXTERN (decl
) = 1;
8971 DECL_EXTERNAL (decl
) = !initialized
;
8974 if (DECL_CLASS_SCOPE_P (decl
))
8976 set_linkage_for_static_data_member (decl
);
8977 /* This function is only called with out-of-class definitions. */
8978 DECL_EXTERNAL (decl
) = 0;
8979 check_class_member_definition_namespace (decl
);
8981 /* At top level, either `static' or no s.c. makes a definition
8982 (perhaps tentative), and absence of `static' makes it public. */
8983 else if (toplevel_bindings_p ())
8985 TREE_PUBLIC (decl
) = (declspecs
->storage_class
!= sc_static
8986 && (DECL_THIS_EXTERN (decl
)
8990 TREE_STATIC (decl
) = ! DECL_EXTERNAL (decl
);
8992 /* Not at top level, only `static' makes a static definition. */
8995 TREE_STATIC (decl
) = declspecs
->storage_class
== sc_static
;
8996 TREE_PUBLIC (decl
) = DECL_EXTERNAL (decl
);
8999 if (decl_spec_seq_has_spec_p (declspecs
, ds_thread
))
9001 if (DECL_EXTERNAL (decl
) || TREE_STATIC (decl
))
9003 CP_DECL_THREAD_LOCAL_P (decl
) = true;
9004 if (!processing_template_decl
)
9005 set_decl_tls_model (decl
, decl_default_tls_model (decl
));
9007 if (declspecs
->gnu_thread_keyword_p
)
9008 SET_DECL_GNU_TLS_P (decl
);
9011 /* If the type of the decl has no linkage, make sure that we'll
9012 notice that in mark_used. */
9013 if (cxx_dialect
> cxx98
9014 && decl_linkage (decl
) != lk_none
9015 && DECL_LANG_SPECIFIC (decl
) == NULL
9016 && !DECL_EXTERN_C_P (decl
)
9017 && no_linkage_check (TREE_TYPE (decl
), /*relaxed_p=*/false))
9018 retrofit_lang_decl (decl
);
9020 if (TREE_PUBLIC (decl
))
9022 /* [basic.link]: A name with no linkage (notably, the name of a class
9023 or enumeration declared in a local scope) shall not be used to
9024 declare an entity with linkage.
9026 DR 757 relaxes this restriction for C++0x. */
9027 if (cxx_dialect
< cxx11
)
9028 no_linkage_error (decl
);
9031 DECL_INTERFACE_KNOWN (decl
) = 1;
9033 if (DECL_NAME (decl
)
9034 && MAIN_NAME_P (DECL_NAME (decl
))
9035 && scope
== global_namespace
)
9036 error ("cannot declare %<::main%> to be a global variable");
9038 /* Check that the variable can be safely declared as a concept.
9039 Note that this also forbids explicit specializations. */
9042 if (!processing_template_decl
)
9044 error ("a non-template variable cannot be %<concept%>");
9048 DECL_DECLARED_CONCEPT_P (decl
) = true;
9049 if (!same_type_ignoring_top_level_qualifiers_p (type
, boolean_type_node
))
9050 error_at (declspecs
->locations
[ds_type_spec
],
9051 "concept must have type %<bool%>");
9053 else if (flag_concepts
9054 && processing_template_decl
> template_class_depth (scope
))
9056 tree reqs
= TEMPLATE_PARMS_CONSTRAINTS (current_template_parms
);
9057 tree ci
= build_constraints (reqs
, NULL_TREE
);
9058 set_constraints (decl
, ci
);
9061 // Handle explicit specializations and instantiations of variable templates.
9062 if (orig_declarator
)
9063 decl
= check_explicit_specialization (orig_declarator
, decl
,
9064 template_count
, conceptp
* 8);
9066 return decl
!= error_mark_node
? decl
: NULL_TREE
;
9069 /* Create and return a canonical pointer to member function type, for
9070 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
9073 build_ptrmemfunc_type (tree type
)
9078 if (type
== error_mark_node
)
9081 /* Make sure that we always have the unqualified pointer-to-member
9083 if (cp_cv_quals quals
= cp_type_quals (type
))
9085 tree unqual
= build_ptrmemfunc_type (TYPE_MAIN_VARIANT (type
));
9086 return cp_build_qualified_type (unqual
, quals
);
9089 /* If a canonical type already exists for this type, use it. We use
9090 this method instead of type_hash_canon, because it only does a
9091 simple equality check on the list of field members. */
9093 if ((t
= TYPE_GET_PTRMEMFUNC_TYPE (type
)))
9096 t
= make_node (RECORD_TYPE
);
9098 /* Let the front end know this is a pointer to member function. */
9099 TYPE_PTRMEMFUNC_FLAG (t
) = 1;
9101 field
= build_decl (input_location
, FIELD_DECL
, pfn_identifier
, type
);
9104 field
= build_decl (input_location
, FIELD_DECL
, delta_identifier
,
9106 DECL_CHAIN (field
) = fields
;
9109 finish_builtin_struct (t
, "__ptrmemfunc_type", fields
, ptr_type_node
);
9111 /* Zap out the name so that the back end will give us the debugging
9112 information for this anonymous RECORD_TYPE. */
9113 TYPE_NAME (t
) = NULL_TREE
;
9115 /* Cache this pointer-to-member type so that we can find it again
9117 TYPE_SET_PTRMEMFUNC_TYPE (type
, t
);
9119 if (TYPE_STRUCTURAL_EQUALITY_P (type
))
9120 SET_TYPE_STRUCTURAL_EQUALITY (t
);
9121 else if (TYPE_CANONICAL (type
) != type
)
9122 TYPE_CANONICAL (t
) = build_ptrmemfunc_type (TYPE_CANONICAL (type
));
9127 /* Create and return a pointer to data member type. */
9130 build_ptrmem_type (tree class_type
, tree member_type
)
9132 if (TREE_CODE (member_type
) == METHOD_TYPE
)
9134 cp_cv_quals quals
= type_memfn_quals (member_type
);
9135 cp_ref_qualifier rqual
= type_memfn_rqual (member_type
);
9136 member_type
= build_memfn_type (member_type
, class_type
, quals
, rqual
);
9137 return build_ptrmemfunc_type (build_pointer_type (member_type
));
9141 gcc_assert (TREE_CODE (member_type
) != FUNCTION_TYPE
);
9142 return build_offset_type (class_type
, member_type
);
9146 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
9147 Check to see that the definition is valid. Issue appropriate error
9148 messages. Return 1 if the definition is particularly bad, or 0
9152 check_static_variable_definition (tree decl
, tree type
)
9154 /* Avoid redundant diagnostics on out-of-class definitions. */
9155 if (!current_class_type
|| !TYPE_BEING_DEFINED (current_class_type
))
9157 /* Can't check yet if we don't know the type. */
9158 if (dependent_type_p (type
))
9160 /* If DECL is declared constexpr, we'll do the appropriate checks
9161 in check_initializer. Similarly for inline static data members. */
9163 && (DECL_DECLARED_CONSTEXPR_P (decl
)
9164 || DECL_VAR_DECLARED_INLINE_P (decl
)))
9166 else if (cxx_dialect
>= cxx11
&& !INTEGRAL_OR_ENUMERATION_TYPE_P (type
))
9168 if (!COMPLETE_TYPE_P (type
))
9169 error_at (DECL_SOURCE_LOCATION (decl
),
9170 "in-class initialization of static data member %q#D of "
9171 "incomplete type", decl
);
9172 else if (literal_type_p (type
))
9173 permerror (DECL_SOURCE_LOCATION (decl
),
9174 "%<constexpr%> needed for in-class initialization of "
9175 "static data member %q#D of non-integral type", decl
);
9177 error_at (DECL_SOURCE_LOCATION (decl
),
9178 "in-class initialization of static data member %q#D of "
9179 "non-literal type", decl
);
9183 /* Motion 10 at San Diego: If a static const integral data member is
9184 initialized with an integral constant expression, the initializer
9185 may appear either in the declaration (within the class), or in
9186 the definition, but not both. If it appears in the class, the
9187 member is a member constant. The file-scope definition is always
9189 if (!ARITHMETIC_TYPE_P (type
) && TREE_CODE (type
) != ENUMERAL_TYPE
)
9191 error_at (DECL_SOURCE_LOCATION (decl
),
9192 "invalid in-class initialization of static data member "
9193 "of non-integral type %qT",
9197 else if (!CP_TYPE_CONST_P (type
))
9198 error_at (DECL_SOURCE_LOCATION (decl
),
9199 "ISO C++ forbids in-class initialization of non-const "
9200 "static member %qD",
9202 else if (!INTEGRAL_OR_ENUMERATION_TYPE_P (type
))
9203 pedwarn (DECL_SOURCE_LOCATION (decl
), OPT_Wpedantic
,
9204 "ISO C++ forbids initialization of member constant "
9205 "%qD of non-integral type %qT", decl
, type
);
9210 /* *expr_p is part of the TYPE_SIZE of a variably-sized array. If any
9211 SAVE_EXPRs in *expr_p wrap expressions with side-effects, break those
9212 expressions out into temporary variables so that walk_tree doesn't
9213 step into them (c++/15764). */
9216 stabilize_save_expr_r (tree
*expr_p
, int *walk_subtrees
, void *data
)
9218 hash_set
<tree
> *pset
= (hash_set
<tree
> *)data
;
9219 tree expr
= *expr_p
;
9220 if (TREE_CODE (expr
) == SAVE_EXPR
)
9222 tree op
= TREE_OPERAND (expr
, 0);
9223 cp_walk_tree (&op
, stabilize_save_expr_r
, data
, pset
);
9224 if (TREE_SIDE_EFFECTS (op
))
9225 TREE_OPERAND (expr
, 0) = get_temp_regvar (TREE_TYPE (op
), op
);
9228 else if (!EXPR_P (expr
) || !TREE_SIDE_EFFECTS (expr
))
9233 /* Entry point for the above. */
9236 stabilize_vla_size (tree size
)
9238 hash_set
<tree
> pset
;
9239 /* Break out any function calls into temporary variables. */
9240 cp_walk_tree (&size
, stabilize_save_expr_r
, &pset
, &pset
);
9243 /* Reduce a SIZEOF_EXPR to its value. */
9246 fold_sizeof_expr (tree t
)
9249 if (SIZEOF_EXPR_TYPE_P (t
))
9250 r
= cxx_sizeof_or_alignof_type (TREE_TYPE (TREE_OPERAND (t
, 0)),
9251 SIZEOF_EXPR
, false);
9252 else if (TYPE_P (TREE_OPERAND (t
, 0)))
9253 r
= cxx_sizeof_or_alignof_type (TREE_OPERAND (t
, 0), SIZEOF_EXPR
,
9256 r
= cxx_sizeof_or_alignof_expr (TREE_OPERAND (t
, 0), SIZEOF_EXPR
,
9258 if (r
== error_mark_node
)
9263 /* Given the SIZE (i.e., number of elements) in an array, compute
9264 an appropriate index type for the array. If non-NULL, NAME is
9265 the name of the entity being declared. */
9268 compute_array_index_type (tree name
, tree size
, tsubst_flags_t complain
)
9273 if (error_operand_p (size
))
9274 return error_mark_node
;
9276 if (!type_dependent_expression_p (size
))
9278 tree type
= TREE_TYPE (size
);
9280 mark_rvalue_use (size
);
9282 if (cxx_dialect
< cxx11
&& TREE_CODE (size
) == NOP_EXPR
9283 && TREE_SIDE_EFFECTS (size
))
9284 /* In C++98, we mark a non-constant array bound with a magic
9285 NOP_EXPR with TREE_SIDE_EFFECTS; don't fold in that case. */;
9288 size
= instantiate_non_dependent_expr_sfinae (size
, complain
);
9290 if (CLASS_TYPE_P (type
)
9291 && CLASSTYPE_LITERAL_P (type
))
9293 size
= build_expr_type_conversion (WANT_INT
, size
, true);
9296 if (!(complain
& tf_error
))
9297 return error_mark_node
;
9299 error ("size of array %qD has non-integral type %qT",
9302 error ("size of array has non-integral type %qT", type
);
9303 size
= integer_one_node
;
9305 if (size
== error_mark_node
)
9306 return error_mark_node
;
9307 type
= TREE_TYPE (size
);
9310 if (INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type
))
9311 size
= maybe_constant_value (size
);
9313 if (!TREE_CONSTANT (size
))
9317 if (error_operand_p (size
))
9318 return error_mark_node
;
9320 /* The array bound must be an integer type. */
9321 if (!INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type
))
9323 if (!(complain
& tf_error
))
9324 return error_mark_node
;
9326 error ("size of array %qD has non-integral type %qT", name
, type
);
9328 error ("size of array has non-integral type %qT", type
);
9329 size
= integer_one_node
;
9330 type
= TREE_TYPE (size
);
9334 /* A type is dependent if it is...an array type constructed from any
9335 dependent type or whose size is specified by a constant expression
9336 that is value-dependent. */
9337 /* We can only call value_dependent_expression_p on integral constant
9338 expressions; treat non-constant expressions as dependent, too. */
9339 if (processing_template_decl
9340 && (type_dependent_expression_p (size
)
9341 || !TREE_CONSTANT (size
) || value_dependent_expression_p (size
)))
9343 /* We cannot do any checking for a SIZE that isn't known to be
9344 constant. Just build the index type and mark that it requires
9345 structural equality checks. */
9346 itype
= build_index_type (build_min (MINUS_EXPR
, sizetype
,
9347 size
, size_one_node
));
9348 TYPE_DEPENDENT_P (itype
) = 1;
9349 TYPE_DEPENDENT_P_VALID (itype
) = 1;
9350 SET_TYPE_STRUCTURAL_EQUALITY (itype
);
9354 if (TREE_CODE (size
) != INTEGER_CST
)
9356 tree folded
= cp_fully_fold (size
);
9357 if (TREE_CODE (folded
) == INTEGER_CST
)
9358 pedwarn (location_of (size
), OPT_Wpedantic
,
9359 "size of array is not an integral constant-expression");
9360 /* Use the folded result for VLAs, too; it will have resolved
9365 /* Normally, the array-bound will be a constant. */
9366 if (TREE_CODE (size
) == INTEGER_CST
)
9368 /* Check to see if the array bound overflowed. Make that an
9369 error, no matter how generous we're being. */
9370 constant_expression_error (size
);
9372 /* An array must have a positive number of elements. */
9373 if (tree_int_cst_lt (size
, integer_zero_node
))
9375 if (!(complain
& tf_error
))
9376 return error_mark_node
;
9378 error ("size of array %qD is negative", name
);
9380 error ("size of array is negative");
9381 size
= integer_one_node
;
9383 /* As an extension we allow zero-sized arrays. */
9384 else if (integer_zerop (size
))
9386 if (!(complain
& tf_error
))
9387 /* We must fail if performing argument deduction (as
9388 indicated by the state of complain), so that
9389 another substitution can be found. */
9390 return error_mark_node
;
9391 else if (in_system_header_at (input_location
))
9392 /* Allow them in system headers because glibc uses them. */;
9394 pedwarn (input_location
, OPT_Wpedantic
, "ISO C++ forbids zero-size array %qD", name
);
9396 pedwarn (input_location
, OPT_Wpedantic
, "ISO C++ forbids zero-size array");
9399 else if (TREE_CONSTANT (size
)
9400 /* We don't allow VLAs at non-function scopes, or during
9401 tentative template substitution. */
9402 || !at_function_scope_p ()
9403 || !(complain
& tf_error
))
9405 if (!(complain
& tf_error
))
9406 return error_mark_node
;
9407 /* `(int) &fn' is not a valid array bound. */
9409 error ("size of array %qD is not an integral constant-expression",
9412 error ("size of array is not an integral constant-expression");
9413 size
= integer_one_node
;
9415 else if (pedantic
&& warn_vla
!= 0)
9418 pedwarn (input_location
, OPT_Wvla
, "ISO C++ forbids variable length array %qD", name
);
9420 pedwarn (input_location
, OPT_Wvla
, "ISO C++ forbids variable length array");
9422 else if (warn_vla
> 0)
9426 "variable length array %qD is used", name
);
9429 "variable length array is used");
9432 if (processing_template_decl
&& !TREE_CONSTANT (size
))
9433 /* A variable sized array. */
9434 itype
= build_min (MINUS_EXPR
, sizetype
, size
, integer_one_node
);
9437 HOST_WIDE_INT saved_processing_template_decl
;
9439 /* Compute the index of the largest element in the array. It is
9440 one less than the number of elements in the array. We save
9441 and restore PROCESSING_TEMPLATE_DECL so that computations in
9442 cp_build_binary_op will be appropriately folded. */
9443 saved_processing_template_decl
= processing_template_decl
;
9444 processing_template_decl
= 0;
9445 itype
= cp_build_binary_op (input_location
,
9447 cp_convert (ssizetype
, size
, complain
),
9448 cp_convert (ssizetype
, integer_one_node
,
9451 itype
= maybe_constant_value (itype
);
9452 processing_template_decl
= saved_processing_template_decl
;
9454 if (!TREE_CONSTANT (itype
))
9456 /* A variable sized array. */
9457 itype
= variable_size (itype
);
9459 stabilize_vla_size (itype
);
9461 if (flag_sanitize
& SANITIZE_VLA
9462 && do_ubsan_in_current_function ())
9464 /* We have to add 1 -- in the ubsan routine we generate
9465 LE_EXPR rather than LT_EXPR. */
9466 tree t
= fold_build2 (PLUS_EXPR
, TREE_TYPE (itype
), itype
,
9467 build_one_cst (TREE_TYPE (itype
)));
9468 t
= ubsan_instrument_vla (input_location
, t
);
9469 finish_expr_stmt (t
);
9472 /* Make sure that there was no overflow when creating to a signed
9473 index type. (For example, on a 32-bit machine, an array with
9474 size 2^32 - 1 is too big.) */
9475 else if (TREE_CODE (itype
) == INTEGER_CST
9476 && TREE_OVERFLOW (itype
))
9478 if (!(complain
& tf_error
))
9479 return error_mark_node
;
9480 error ("overflow in array dimension");
9481 TREE_OVERFLOW (itype
) = 0;
9485 /* Create and return the appropriate index type. */
9486 itype
= build_index_type (itype
);
9488 /* If the index type were dependent, we would have returned early, so
9489 remember that it isn't. */
9490 TYPE_DEPENDENT_P (itype
) = 0;
9491 TYPE_DEPENDENT_P_VALID (itype
) = 1;
9495 /* Returns the scope (if any) in which the entity declared by
9496 DECLARATOR will be located. If the entity was declared with an
9497 unqualified name, NULL_TREE is returned. */
9500 get_scope_of_declarator (const cp_declarator
*declarator
)
9502 while (declarator
&& declarator
->kind
!= cdk_id
)
9503 declarator
= declarator
->declarator
;
9505 /* If the declarator-id is a SCOPE_REF, the scope in which the
9506 declaration occurs is the first operand. */
9508 && declarator
->u
.id
.qualifying_scope
)
9509 return declarator
->u
.id
.qualifying_scope
;
9511 /* Otherwise, the declarator is not a qualified name; the entity will
9512 be declared in the current scope. */
9516 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
9517 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
9521 create_array_type_for_decl (tree name
, tree type
, tree size
)
9523 tree itype
= NULL_TREE
;
9525 /* If things have already gone awry, bail now. */
9526 if (type
== error_mark_node
|| size
== error_mark_node
)
9527 return error_mark_node
;
9529 /* 8.3.4/1: If the type of the identifier of D contains the auto
9530 type-specifier, the program is ill-formed. */
9531 if (type_uses_auto (type
))
9533 error ("%qD declared as array of %qT", name
, type
);
9534 return error_mark_node
;
9537 /* If there are some types which cannot be array elements,
9538 issue an error-message and return. */
9539 switch (TREE_CODE (type
))
9543 error ("declaration of %qD as array of void", name
);
9545 error ("creating array of void");
9546 return error_mark_node
;
9550 error ("declaration of %qD as array of functions", name
);
9552 error ("creating array of functions");
9553 return error_mark_node
;
9555 case REFERENCE_TYPE
:
9557 error ("declaration of %qD as array of references", name
);
9559 error ("creating array of references");
9560 return error_mark_node
;
9564 error ("declaration of %qD as array of function members", name
);
9566 error ("creating array of function members");
9567 return error_mark_node
;
9575 The constant expressions that specify the bounds of the arrays
9576 can be omitted only for the first member of the sequence. */
9577 if (TREE_CODE (type
) == ARRAY_TYPE
&& !TYPE_DOMAIN (type
))
9580 error ("declaration of %qD as multidimensional array must "
9581 "have bounds for all dimensions except the first",
9584 error ("multidimensional array must have bounds for all "
9585 "dimensions except the first");
9587 return error_mark_node
;
9590 /* Figure out the index type for the array. */
9592 itype
= compute_array_index_type (name
, size
, tf_warning_or_error
);
9595 T is called the array element type; this type shall not be [...] an
9596 abstract class type. */
9597 abstract_virtuals_error (name
, type
);
9599 return build_cplus_array_type (type
, itype
);
9602 /* Returns the smallest location != UNKNOWN_LOCATION among the
9603 three stored in LOCATIONS[ds_const], LOCATIONS[ds_volatile],
9604 and LOCATIONS[ds_restrict]. */
9607 smallest_type_quals_location (int type_quals
, const location_t
* locations
)
9609 location_t loc
= UNKNOWN_LOCATION
;
9611 if (type_quals
& TYPE_QUAL_CONST
)
9612 loc
= locations
[ds_const
];
9614 if ((type_quals
& TYPE_QUAL_VOLATILE
)
9615 && (loc
== UNKNOWN_LOCATION
|| locations
[ds_volatile
] < loc
))
9616 loc
= locations
[ds_volatile
];
9618 if ((type_quals
& TYPE_QUAL_RESTRICT
)
9619 && (loc
== UNKNOWN_LOCATION
|| locations
[ds_restrict
] < loc
))
9620 loc
= locations
[ds_restrict
];
9625 /* Check that it's OK to declare a function with the indicated TYPE
9626 and TYPE_QUALS. SFK indicates the kind of special function (if any)
9627 that this function is. OPTYPE is the type given in a conversion
9628 operator declaration, or the class type for a constructor/destructor.
9629 Returns the actual return type of the function; that may be different
9630 than TYPE if an error occurs, or for certain special functions. */
9633 check_special_function_return_type (special_function_kind sfk
,
9637 const location_t
* locations
)
9641 case sfk_constructor
:
9643 error ("return type specification for constructor invalid");
9644 else if (type_quals
!= TYPE_UNQUALIFIED
)
9645 error_at (smallest_type_quals_location (type_quals
, locations
),
9646 "qualifiers are not allowed on constructor declaration");
9648 if (targetm
.cxx
.cdtor_returns_this ())
9649 type
= build_pointer_type (optype
);
9651 type
= void_type_node
;
9654 case sfk_destructor
:
9656 error ("return type specification for destructor invalid");
9657 else if (type_quals
!= TYPE_UNQUALIFIED
)
9658 error_at (smallest_type_quals_location (type_quals
, locations
),
9659 "qualifiers are not allowed on destructor declaration");
9661 /* We can't use the proper return type here because we run into
9662 problems with ambiguous bases and covariant returns. */
9663 if (targetm
.cxx
.cdtor_returns_this ())
9664 type
= build_pointer_type (void_type_node
);
9666 type
= void_type_node
;
9669 case sfk_conversion
:
9671 error ("return type specified for %<operator %T%>", optype
);
9672 else if (type_quals
!= TYPE_UNQUALIFIED
)
9673 error_at (smallest_type_quals_location (type_quals
, locations
),
9674 "qualifiers are not allowed on declaration of "
9675 "%<operator %T%>", optype
);
9687 /* A variable or data member (whose unqualified name is IDENTIFIER)
9688 has been declared with the indicated TYPE. If the TYPE is not
9689 acceptable, issue an error message and return a type to use for
9690 error-recovery purposes. */
9693 check_var_type (tree identifier
, tree type
)
9695 if (VOID_TYPE_P (type
))
9698 error ("unnamed variable or field declared void");
9699 else if (identifier_p (identifier
))
9701 gcc_assert (!IDENTIFIER_OPNAME_P (identifier
));
9702 error ("variable or field %qE declared void", identifier
);
9705 error ("variable or field declared void");
9706 type
= error_mark_node
;
9712 /* Handle declaring DECL as an inline variable. */
9715 mark_inline_variable (tree decl
)
9717 bool inlinep
= true;
9718 if (! toplevel_bindings_p ())
9720 error ("%<inline%> specifier invalid for variable "
9721 "%qD declared at block scope", decl
);
9724 else if (cxx_dialect
< cxx1z
)
9725 pedwarn (DECL_SOURCE_LOCATION (decl
), 0,
9726 "inline variables are only available "
9727 "with -std=c++1z or -std=gnu++1z");
9730 retrofit_lang_decl (decl
);
9731 SET_DECL_VAR_DECLARED_INLINE_P (decl
);
9735 /* Given declspecs and a declarator (abstract or otherwise), determine
9736 the name and type of the object declared and construct a DECL node
9739 DECLSPECS points to the representation of declaration-specifier
9740 sequence that precedes declarator.
9742 DECL_CONTEXT says which syntactic context this declaration is in:
9743 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
9744 FUNCDEF for a function definition. Like NORMAL but a few different
9745 error messages in each case. Return value may be zero meaning
9746 this definition is too screwy to try to parse.
9747 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
9748 handle member functions (which have FIELD context).
9749 Return value may be zero meaning this definition is too screwy to
9751 PARM for a parameter declaration (either within a function prototype
9752 or before a function body). Make a PARM_DECL, or return void_type_node.
9753 TPARM for a template parameter declaration.
9754 CATCHPARM for a parameter declaration before a catch clause.
9755 TYPENAME if for a typename (in a cast or sizeof).
9756 Don't make a DECL node; just return the ..._TYPE node.
9757 FIELD for a struct or union field; make a FIELD_DECL.
9758 BITFIELD for a field with specified width.
9760 INITIALIZED is as for start_decl.
9762 ATTRLIST is a pointer to the list of attributes, which may be NULL
9763 if there are none; *ATTRLIST may be modified if attributes from inside
9764 the declarator should be applied to the declaration.
9766 When this function is called, scoping variables (such as
9767 CURRENT_CLASS_TYPE) should reflect the scope in which the
9768 declaration occurs, not the scope in which the new declaration will
9769 be placed. For example, on:
9773 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
9776 Returns a DECL (if a declarator is present), a TYPE (if there is no
9777 declarator, in cases like "struct S;"), or the ERROR_MARK_NODE if an
9781 grokdeclarator (const cp_declarator
*declarator
,
9782 cp_decl_specifier_seq
*declspecs
,
9783 enum decl_context decl_context
,
9787 tree type
= NULL_TREE
;
9789 int explicit_intN
= 0;
9790 int virtualp
, explicitp
, friendp
, inlinep
, staticp
;
9791 int explicit_int
= 0;
9792 int explicit_char
= 0;
9793 int defaulted_int
= 0;
9795 tree typedef_decl
= NULL_TREE
;
9796 const char *name
= NULL
;
9797 tree typedef_type
= NULL_TREE
;
9798 /* True if this declarator is a function definition. */
9799 bool funcdef_flag
= false;
9800 cp_declarator_kind innermost_code
= cdk_error
;
9803 /* See the code below that used this. */
9804 tree decl_attr
= NULL_TREE
;
9807 /* Keep track of what sort of function is being processed
9808 so that we can warn about default return values, or explicit
9809 return values which do not match prescribed defaults. */
9810 special_function_kind sfk
= sfk_none
;
9812 tree dname
= NULL_TREE
;
9813 tree ctor_return_type
= NULL_TREE
;
9814 enum overload_flags flags
= NO_SPECIAL
;
9815 /* cv-qualifiers that apply to the declarator, for a declaration of
9816 a member function. */
9817 cp_cv_quals memfn_quals
= TYPE_UNQUALIFIED
;
9818 /* virt-specifiers that apply to the declarator, for a declaration of
9819 a member function. */
9820 cp_virt_specifiers virt_specifiers
= VIRT_SPEC_UNSPECIFIED
;
9821 /* ref-qualifier that applies to the declarator, for a declaration of
9822 a member function. */
9823 cp_ref_qualifier rqual
= REF_QUAL_NONE
;
9824 /* cv-qualifiers that apply to the type specified by the DECLSPECS. */
9825 int type_quals
= TYPE_UNQUALIFIED
;
9826 tree raises
= NULL_TREE
;
9827 int template_count
= 0;
9828 tree returned_attrs
= NULL_TREE
;
9829 tree parms
= NULL_TREE
;
9830 const cp_declarator
*id_declarator
;
9831 /* The unqualified name of the declarator; either an
9832 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
9833 tree unqualified_id
;
9834 /* The class type, if any, in which this entity is located,
9835 or NULL_TREE if none. Note that this value may be different from
9836 the current class type; for example if an attempt is made to declare
9837 "A::f" inside "B", this value will be "A". */
9838 tree ctype
= current_class_type
;
9839 /* The NAMESPACE_DECL for the namespace in which this entity is
9840 located. If an unqualified name is used to declare the entity,
9841 this value will be NULL_TREE, even if the entity is located at
9843 tree in_namespace
= NULL_TREE
;
9844 cp_storage_class storage_class
;
9845 bool unsigned_p
, signed_p
, short_p
, long_p
, thread_p
;
9846 bool type_was_error_mark_node
= false;
9847 bool parameter_pack_p
= declarator
? declarator
->parameter_pack_p
: false;
9848 bool template_type_arg
= false;
9849 bool template_parm_flag
= false;
9850 bool typedef_p
= decl_spec_seq_has_spec_p (declspecs
, ds_typedef
);
9851 bool constexpr_p
= decl_spec_seq_has_spec_p (declspecs
, ds_constexpr
);
9852 bool late_return_type_p
= false;
9853 bool array_parameter_p
= false;
9854 source_location saved_loc
= input_location
;
9855 tree reqs
= NULL_TREE
;
9857 signed_p
= decl_spec_seq_has_spec_p (declspecs
, ds_signed
);
9858 unsigned_p
= decl_spec_seq_has_spec_p (declspecs
, ds_unsigned
);
9859 short_p
= decl_spec_seq_has_spec_p (declspecs
, ds_short
);
9860 long_p
= decl_spec_seq_has_spec_p (declspecs
, ds_long
);
9861 longlong
= decl_spec_seq_has_spec_p (declspecs
, ds_long_long
);
9862 explicit_intN
= declspecs
->explicit_intN_p
;
9863 thread_p
= decl_spec_seq_has_spec_p (declspecs
, ds_thread
);
9865 // Was concept_p specified? Note that ds_concept
9866 // implies ds_constexpr!
9867 bool concept_p
= decl_spec_seq_has_spec_p (declspecs
, ds_concept
);
9871 if (decl_spec_seq_has_spec_p (declspecs
, ds_const
))
9872 type_quals
|= TYPE_QUAL_CONST
;
9873 if (decl_spec_seq_has_spec_p (declspecs
, ds_volatile
))
9874 type_quals
|= TYPE_QUAL_VOLATILE
;
9875 if (decl_spec_seq_has_spec_p (declspecs
, ds_restrict
))
9876 type_quals
|= TYPE_QUAL_RESTRICT
;
9878 if (decl_context
== FUNCDEF
)
9879 funcdef_flag
= true, decl_context
= NORMAL
;
9880 else if (decl_context
== MEMFUNCDEF
)
9881 funcdef_flag
= true, decl_context
= FIELD
;
9882 else if (decl_context
== BITFIELD
)
9883 bitfield
= 1, decl_context
= FIELD
;
9884 else if (decl_context
== TEMPLATE_TYPE_ARG
)
9885 template_type_arg
= true, decl_context
= TYPENAME
;
9886 else if (decl_context
== TPARM
)
9887 template_parm_flag
= true, decl_context
= PARM
;
9889 if (initialized
> 1)
9890 funcdef_flag
= true;
9892 location_t typespec_loc
= smallest_type_quals_location (type_quals
,
9893 declspecs
->locations
);
9894 if (typespec_loc
== UNKNOWN_LOCATION
)
9895 typespec_loc
= declspecs
->locations
[ds_type_spec
];
9897 /* Look inside a declarator for the name being declared
9898 and get it as a string, for an error message. */
9899 for (id_declarator
= declarator
;
9901 id_declarator
= id_declarator
->declarator
)
9903 if (id_declarator
->kind
!= cdk_id
)
9904 innermost_code
= id_declarator
->kind
;
9906 switch (id_declarator
->kind
)
9909 if (id_declarator
->declarator
9910 && id_declarator
->declarator
->kind
== cdk_id
)
9912 sfk
= id_declarator
->declarator
->u
.id
.sfk
;
9913 if (sfk
== sfk_destructor
)
9920 tree qualifying_scope
= id_declarator
->u
.id
.qualifying_scope
;
9921 tree decl
= id_declarator
->u
.id
.unqualified_name
;
9924 if (qualifying_scope
)
9926 if (at_function_scope_p ())
9930 A declarator-id shall not be qualified except
9933 None of the cases are permitted in block
9935 if (qualifying_scope
== global_namespace
)
9936 error ("invalid use of qualified-name %<::%D%>",
9938 else if (TYPE_P (qualifying_scope
))
9939 error ("invalid use of qualified-name %<%T::%D%>",
9940 qualifying_scope
, decl
);
9942 error ("invalid use of qualified-name %<%D::%D%>",
9943 qualifying_scope
, decl
);
9944 return error_mark_node
;
9946 else if (TYPE_P (qualifying_scope
))
9948 ctype
= qualifying_scope
;
9949 if (!MAYBE_CLASS_TYPE_P (ctype
))
9951 error ("%q#T is not a class or a namespace", ctype
);
9954 else if (innermost_code
!= cdk_function
9955 && current_class_type
9956 && !uniquely_derived_from_p (ctype
,
9957 current_class_type
))
9959 error ("invalid use of qualified-name %<%T::%D%>",
9960 qualifying_scope
, decl
);
9961 return error_mark_node
;
9964 else if (TREE_CODE (qualifying_scope
) == NAMESPACE_DECL
)
9965 in_namespace
= qualifying_scope
;
9967 switch (TREE_CODE (decl
))
9973 if (innermost_code
!= cdk_function
)
9975 error ("declaration of %qD as non-function", decl
);
9976 return error_mark_node
;
9978 else if (!qualifying_scope
9979 && !(current_class_type
&& at_class_scope_p ()))
9981 error ("declaration of %qD as non-member", decl
);
9982 return error_mark_node
;
9985 type
= TREE_OPERAND (decl
, 0);
9987 type
= constructor_name (type
);
9988 name
= identifier_to_locale (IDENTIFIER_POINTER (type
));
9993 case TEMPLATE_ID_EXPR
:
9995 tree fns
= TREE_OPERAND (decl
, 0);
9998 if (!identifier_p (dname
))
10000 if (variable_template_p (dname
))
10001 dname
= DECL_NAME (dname
);
10004 gcc_assert (is_overloaded_fn (dname
));
10005 dname
= DECL_NAME (get_first_fn (dname
));
10009 /* Fall through. */
10011 case IDENTIFIER_NODE
:
10012 if (identifier_p (decl
))
10015 if (C_IS_RESERVED_WORD (dname
))
10017 error ("declarator-id missing; using reserved word %qD",
10019 name
= identifier_to_locale (IDENTIFIER_POINTER (dname
));
10021 else if (!IDENTIFIER_TYPENAME_P (dname
))
10022 name
= identifier_to_locale (IDENTIFIER_POINTER (dname
));
10025 gcc_assert (flags
== NO_SPECIAL
);
10026 flags
= TYPENAME_FLAG
;
10027 ctor_return_type
= TREE_TYPE (dname
);
10028 sfk
= sfk_conversion
;
10029 if (is_typename_at_global_scope (dname
))
10030 name
= identifier_to_locale (IDENTIFIER_POINTER (dname
));
10032 name
= "<invalid operator>";
10037 gcc_unreachable ();
10044 case cdk_reference
:
10049 name
= "decomposition";
10053 return error_mark_node
;
10056 gcc_unreachable ();
10058 if (id_declarator
->kind
== cdk_id
)
10064 The declarator in a function-definition shall have the form
10065 D1 ( parameter-declaration-clause) ... */
10066 if (funcdef_flag
&& innermost_code
!= cdk_function
)
10068 error ("function definition does not declare parameters");
10069 return error_mark_node
;
10072 if (flags
== TYPENAME_FLAG
10073 && innermost_code
!= cdk_function
10074 && ! (ctype
&& !declspecs
->any_specifiers_p
))
10076 error ("declaration of %qD as non-function", dname
);
10077 return error_mark_node
;
10081 && identifier_p (dname
)
10082 && UDLIT_OPER_P (dname
)
10083 && innermost_code
!= cdk_function
)
10085 error ("declaration of %qD as non-function", dname
);
10086 return error_mark_node
;
10089 if (dname
&& IDENTIFIER_OPNAME_P (dname
))
10093 error ("declaration of %qD as %<typedef%>", dname
);
10094 return error_mark_node
;
10096 else if (decl_context
== PARM
|| decl_context
== CATCHPARM
)
10098 error ("declaration of %qD as parameter", dname
);
10099 return error_mark_node
;
10103 /* Anything declared one level down from the top level
10104 must be one of the parameters of a function
10105 (because the body is at least two levels down). */
10107 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
10108 by not allowing C++ class definitions to specify their parameters
10109 with xdecls (must be spec.d in the parmlist).
10111 Since we now wait to push a class scope until we are sure that
10112 we are in a legitimate method context, we must set oldcname
10113 explicitly (since current_class_name is not yet alive).
10115 We also want to avoid calling this a PARM if it is in a namespace. */
10117 if (decl_context
== NORMAL
&& !toplevel_bindings_p ())
10119 cp_binding_level
*b
= current_binding_level
;
10120 current_binding_level
= b
->level_chain
;
10121 if (current_binding_level
!= 0 && toplevel_bindings_p ())
10122 decl_context
= PARM
;
10123 current_binding_level
= b
;
10127 name
= decl_context
== PARM
? "parameter" : "type name";
10129 if (concept_p
&& typedef_p
)
10131 error ("%<concept%> cannot appear in a typedef declaration");
10132 return error_mark_node
;
10135 if (constexpr_p
&& typedef_p
)
10137 error ("%<constexpr%> cannot appear in a typedef declaration");
10138 return error_mark_node
;
10141 /* If there were multiple types specified in the decl-specifier-seq,
10142 issue an error message. */
10143 if (declspecs
->multiple_types_p
)
10145 error ("two or more data types in declaration of %qs", name
);
10146 return error_mark_node
;
10149 if (declspecs
->conflicting_specifiers_p
)
10151 error ("conflicting specifiers in declaration of %qs", name
);
10152 return error_mark_node
;
10155 /* Extract the basic type from the decl-specifier-seq. */
10156 type
= declspecs
->type
;
10157 if (type
== error_mark_node
)
10160 type_was_error_mark_node
= true;
10162 /* If the entire declaration is itself tagged as deprecated then
10163 suppress reports of deprecated items. */
10164 if (type
&& TREE_DEPRECATED (type
)
10165 && deprecated_state
!= DEPRECATED_SUPPRESS
)
10166 warn_deprecated_use (type
, NULL_TREE
);
10167 if (type
&& TREE_CODE (type
) == TYPE_DECL
)
10169 typedef_decl
= type
;
10170 type
= TREE_TYPE (typedef_decl
);
10171 if (TREE_DEPRECATED (type
)
10172 && DECL_ARTIFICIAL (typedef_decl
)
10173 && deprecated_state
!= DEPRECATED_SUPPRESS
)
10174 warn_deprecated_use (type
, NULL_TREE
);
10176 /* No type at all: default to `int', and set DEFAULTED_INT
10177 because it was not a user-defined typedef. */
10178 if (type
== NULL_TREE
)
10180 if (signed_p
|| unsigned_p
|| long_p
|| short_p
)
10182 /* These imply 'int'. */
10183 type
= integer_type_node
;
10186 /* If we just have "complex", it is equivalent to "complex double". */
10187 else if (!longlong
&& !explicit_intN
10188 && decl_spec_seq_has_spec_p (declspecs
, ds_complex
))
10190 type
= double_type_node
;
10191 pedwarn (declspecs
->locations
[ds_complex
], OPT_Wpedantic
,
10192 "ISO C++ does not support plain %<complex%> meaning "
10193 "%<double complex%>");
10196 /* Gather flags. */
10197 explicit_int
= declspecs
->explicit_int_p
;
10198 explicit_char
= declspecs
->explicit_char_p
;
10201 /* See the code below that used this. */
10203 decl_attr
= DECL_ATTRIBUTES (typedef_decl
);
10205 typedef_type
= type
;
10208 if (sfk
!= sfk_conversion
)
10209 ctor_return_type
= ctype
;
10211 if (sfk
!= sfk_none
)
10213 type
= check_special_function_return_type (sfk
, type
,
10216 declspecs
->locations
);
10217 type_quals
= TYPE_UNQUALIFIED
;
10219 else if (type
== NULL_TREE
)
10225 /* We handle `main' specially here, because 'main () { }' is so
10226 common. With no options, it is allowed. With -Wreturn-type,
10227 it is a warning. It is only an error with -pedantic-errors. */
10228 is_main
= (funcdef_flag
10229 && dname
&& identifier_p (dname
)
10230 && MAIN_NAME_P (dname
)
10231 && ctype
== NULL_TREE
10232 && in_namespace
== NULL_TREE
10233 && current_namespace
== global_namespace
);
10235 if (type_was_error_mark_node
)
10236 /* We've already issued an error, don't complain more. */;
10237 else if (in_system_header_at (input_location
) || flag_ms_extensions
)
10238 /* Allow it, sigh. */;
10239 else if (! is_main
)
10240 permerror (input_location
, "ISO C++ forbids declaration of %qs with no type", name
);
10242 pedwarn (input_location
, OPT_Wpedantic
,
10243 "ISO C++ forbids declaration of %qs with no type", name
);
10245 warning (OPT_Wreturn_type
,
10246 "ISO C++ forbids declaration of %qs with no type", name
);
10248 if (type_was_error_mark_node
&& template_parm_flag
)
10249 /* FIXME we should be able to propagate the error_mark_node as is
10250 for other contexts too. */
10251 type
= error_mark_node
;
10253 type
= integer_type_node
;
10260 if (! int_n_enabled_p
[declspecs
->int_n_idx
])
10262 error ("%<__int%d%> is not supported by this target",
10263 int_n_data
[declspecs
->int_n_idx
].bitsize
);
10264 explicit_intN
= false;
10266 else if (pedantic
&& ! in_system_header_at (input_location
))
10267 pedwarn (input_location
, OPT_Wpedantic
,
10268 "ISO C++ does not support %<__int%d%> for %qs",
10269 int_n_data
[declspecs
->int_n_idx
].bitsize
, name
);
10272 /* Now process the modifiers that were specified
10273 and check for invalid combinations. */
10275 /* Long double is a special combination. */
10276 if (long_p
&& !longlong
&& TYPE_MAIN_VARIANT (type
) == double_type_node
)
10279 type
= cp_build_qualified_type (long_double_type_node
,
10280 cp_type_quals (type
));
10283 /* Check all other uses of type modifiers. */
10285 if (unsigned_p
|| signed_p
|| long_p
|| short_p
)
10289 if ((signed_p
|| unsigned_p
) && TREE_CODE (type
) != INTEGER_TYPE
)
10290 error ("%<signed%> or %<unsigned%> invalid for %qs", name
);
10291 else if (signed_p
&& unsigned_p
)
10292 error ("%<signed%> and %<unsigned%> specified together for %qs", name
);
10293 else if (longlong
&& TREE_CODE (type
) != INTEGER_TYPE
)
10294 error ("%<long long%> invalid for %qs", name
);
10295 else if (long_p
&& TREE_CODE (type
) == REAL_TYPE
)
10296 error ("%<long%> invalid for %qs", name
);
10297 else if (short_p
&& TREE_CODE (type
) == REAL_TYPE
)
10298 error ("%<short%> invalid for %qs", name
);
10299 else if ((long_p
|| short_p
) && TREE_CODE (type
) != INTEGER_TYPE
)
10300 error ("%<long%> or %<short%> invalid for %qs", name
);
10301 else if ((long_p
|| short_p
|| explicit_char
|| explicit_int
) && explicit_intN
)
10302 error ("%<long%>, %<int%>, %<short%>, or %<char%> invalid for %qs", name
);
10303 else if ((long_p
|| short_p
) && explicit_char
)
10304 error ("%<long%> or %<short%> specified with char for %qs", name
);
10305 else if (long_p
&& short_p
)
10306 error ("%<long%> and %<short%> specified together for %qs", name
);
10307 else if (type
== char16_type_node
|| type
== char32_type_node
)
10309 if (signed_p
|| unsigned_p
)
10310 error ("%<signed%> or %<unsigned%> invalid for %qs", name
);
10311 else if (short_p
|| long_p
)
10312 error ("%<short%> or %<long%> invalid for %qs", name
);
10317 if (!explicit_int
&& !defaulted_int
&& !explicit_char
&& !explicit_intN
&& pedantic
)
10319 pedwarn (input_location
, OPT_Wpedantic
,
10320 "long, short, signed or unsigned used invalidly for %qs",
10322 if (flag_pedantic_errors
)
10327 /* Discard the type modifiers if they are invalid. */
10330 unsigned_p
= false;
10338 /* Decide whether an integer type is signed or not.
10339 Optionally treat bitfields as signed by default. */
10343 It is implementation-defined whether a plain (neither
10344 explicitly signed or unsigned) char, short, int, or long
10345 bit-field is signed or unsigned.
10347 Naturally, we extend this to long long as well. Note that
10348 this does not include wchar_t. */
10349 || (bitfield
&& !flag_signed_bitfields
10351 /* A typedef for plain `int' without `signed' can be
10352 controlled just like plain `int', but a typedef for
10353 `signed int' cannot be so controlled. */
10355 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl
))
10356 && TREE_CODE (type
) == INTEGER_TYPE
10357 && !same_type_p (TYPE_MAIN_VARIANT (type
), wchar_type_node
)))
10360 type
= int_n_trees
[declspecs
->int_n_idx
].unsigned_type
;
10362 type
= long_long_unsigned_type_node
;
10364 type
= long_unsigned_type_node
;
10366 type
= short_unsigned_type_node
;
10367 else if (type
== char_type_node
)
10368 type
= unsigned_char_type_node
;
10369 else if (typedef_decl
)
10370 type
= unsigned_type_for (type
);
10372 type
= unsigned_type_node
;
10374 else if (signed_p
&& type
== char_type_node
)
10375 type
= signed_char_type_node
;
10376 else if (explicit_intN
)
10377 type
= int_n_trees
[declspecs
->int_n_idx
].signed_type
;
10379 type
= long_long_integer_type_node
;
10381 type
= long_integer_type_node
;
10383 type
= short_integer_type_node
;
10385 if (decl_spec_seq_has_spec_p (declspecs
, ds_complex
))
10387 if (TREE_CODE (type
) != INTEGER_TYPE
&& TREE_CODE (type
) != REAL_TYPE
)
10388 error ("complex invalid for %qs", name
);
10389 /* If a modifier is specified, the resulting complex is the complex
10390 form of TYPE. E.g, "complex short" is "complex short int". */
10391 else if (type
== integer_type_node
)
10392 type
= complex_integer_type_node
;
10393 else if (type
== float_type_node
)
10394 type
= complex_float_type_node
;
10395 else if (type
== double_type_node
)
10396 type
= complex_double_type_node
;
10397 else if (type
== long_double_type_node
)
10398 type
= complex_long_double_type_node
;
10400 type
= build_complex_type (type
);
10403 /* If we're using the injected-class-name to form a compound type or a
10404 declaration, replace it with the underlying class so we don't get
10405 redundant typedefs in the debug output. But if we are returning the
10406 type unchanged, leave it alone so that it's available to
10407 maybe_get_template_decl_from_type_decl. */
10408 if (CLASS_TYPE_P (type
)
10409 && DECL_SELF_REFERENCE_P (TYPE_NAME (type
))
10410 && type
== TREE_TYPE (TYPE_NAME (type
))
10411 && (declarator
|| type_quals
))
10412 type
= DECL_ORIGINAL_TYPE (TYPE_NAME (type
));
10414 type_quals
|= cp_type_quals (type
);
10415 type
= cp_build_qualified_type_real
10416 (type
, type_quals
, ((((typedef_decl
&& !DECL_ARTIFICIAL (typedef_decl
))
10417 || declspecs
->decltype_p
)
10418 ? tf_ignore_bad_quals
: 0) | tf_warning_or_error
));
10419 /* We might have ignored or rejected some of the qualifiers. */
10420 type_quals
= cp_type_quals (type
);
10422 if (cxx_dialect
>= cxx1z
&& type
&& is_auto (type
)
10423 && innermost_code
!= cdk_function
10424 && id_declarator
&& declarator
!= id_declarator
)
10425 if (tree tmpl
= CLASS_PLACEHOLDER_TEMPLATE (type
))
10427 error_at (typespec_loc
, "template placeholder type %qT must be followed "
10428 "by a simple declarator-id", type
);
10429 inform (DECL_SOURCE_LOCATION (tmpl
), "%qD declared here", tmpl
);
10433 inlinep
= decl_spec_seq_has_spec_p (declspecs
, ds_inline
);
10434 virtualp
= decl_spec_seq_has_spec_p (declspecs
, ds_virtual
);
10435 explicitp
= decl_spec_seq_has_spec_p (declspecs
, ds_explicit
);
10437 storage_class
= declspecs
->storage_class
;
10438 if (storage_class
== sc_static
)
10439 staticp
= 1 + (decl_context
== FIELD
);
10445 error ("member %qD cannot be declared both %<virtual%> "
10446 "and %<static%>", dname
);
10447 storage_class
= sc_none
;
10451 error ("member %qD cannot be declared both %<virtual%> "
10452 "and %<constexpr%>", dname
);
10454 friendp
= decl_spec_seq_has_spec_p (declspecs
, ds_friend
);
10456 /* Issue errors about use of storage classes for parameters. */
10457 if (decl_context
== PARM
)
10461 error ("typedef declaration invalid in parameter declaration");
10462 return error_mark_node
;
10464 else if (template_parm_flag
&& storage_class
!= sc_none
)
10466 error ("storage class specified for template parameter %qs", name
);
10467 return error_mark_node
;
10469 else if (storage_class
== sc_static
10470 || storage_class
== sc_extern
10472 error ("storage class specifiers invalid in parameter declarations");
10474 /* Function parameters cannot be concept. */
10476 error ("a parameter cannot be declared %<concept%>");
10477 /* Function parameters cannot be constexpr. If we saw one, moan
10478 and pretend it wasn't there. */
10479 else if (constexpr_p
)
10481 error ("a parameter cannot be declared %<constexpr%>");
10486 /* Give error if `virtual' is used outside of class declaration. */
10488 && (current_class_name
== NULL_TREE
|| decl_context
!= FIELD
))
10490 error_at (declspecs
->locations
[ds_virtual
],
10491 "%<virtual%> outside class declaration");
10495 if (innermost_code
== cdk_decomp
)
10497 location_t loc
= (declarator
->kind
== cdk_reference
10498 ? declarator
->declarator
->id_loc
: declarator
->id_loc
);
10500 error_at (declspecs
->locations
[ds_inline
],
10501 "decomposition declaration cannot be declared %<inline%>");
10503 error_at (declspecs
->locations
[ds_typedef
],
10504 "decomposition declaration cannot be declared %<typedef%>");
10506 error_at (declspecs
->locations
[ds_constexpr
], "decomposition "
10507 "declaration cannot be declared %<constexpr%>");
10509 error_at (declspecs
->locations
[ds_thread
],
10510 "decomposition declaration cannot be declared %qs",
10511 declspecs
->gnu_thread_keyword_p
10512 ? "__thread" : "thread_local");
10514 error_at (declspecs
->locations
[ds_concept
],
10515 "decomposition declaration cannot be declared %<concept%>");
10516 switch (storage_class
)
10521 error_at (loc
, "decomposition declaration cannot be declared "
10525 error_at (loc
, "decomposition declaration cannot be declared "
10529 error_at (loc
, "decomposition declaration cannot be declared "
10533 error_at (loc
, "decomposition declaration cannot be declared "
10537 error_at (loc
, "decomposition declaration cannot be declared "
10541 gcc_unreachable ();
10543 if (TREE_CODE (type
) != TEMPLATE_TYPE_PARM
10544 || TYPE_IDENTIFIER (type
) != get_identifier ("auto"))
10546 if (type
!= error_mark_node
)
10548 error_at (loc
, "decomposition declaration cannot be declared "
10549 "with type %qT", type
);
10551 "type must be cv-qualified %<auto%> or reference to "
10552 "cv-qualified %<auto%>");
10554 type
= build_qualified_type (make_auto (), type_quals
);
10555 declspecs
->type
= type
;
10562 storage_class
= sc_none
;
10564 declspecs
->storage_class
= sc_none
;
10565 declspecs
->locations
[ds_thread
] = UNKNOWN_LOCATION
;
10568 /* Static anonymous unions are dealt with here. */
10569 if (staticp
&& decl_context
== TYPENAME
10571 && ANON_AGGR_TYPE_P (declspecs
->type
))
10572 decl_context
= FIELD
;
10574 /* Warn about storage classes that are invalid for certain
10575 kinds of declarations (parameters, typenames, etc.). */
10578 && storage_class
!= sc_extern
10579 && storage_class
!= sc_static
)
10582 error ("multiple storage classes in declaration of %qs", name
);
10585 if (decl_context
!= NORMAL
10586 && ((storage_class
!= sc_none
10587 && storage_class
!= sc_mutable
)
10590 if ((decl_context
== PARM
|| decl_context
== CATCHPARM
)
10591 && (storage_class
== sc_register
10592 || storage_class
== sc_auto
))
10594 else if (typedef_p
)
10596 else if (decl_context
== FIELD
10597 /* C++ allows static class elements. */
10598 && storage_class
== sc_static
)
10599 /* C++ also allows inlines and signed and unsigned elements,
10600 but in those cases we don't come in here. */
10604 if (decl_context
== FIELD
)
10605 error ("storage class specified for %qs", name
);
10608 if (decl_context
== PARM
|| decl_context
== CATCHPARM
)
10609 error ("storage class specified for parameter %qs", name
);
10611 error ("storage class specified for typename");
10613 if (storage_class
== sc_register
10614 || storage_class
== sc_auto
10615 || storage_class
== sc_extern
10617 storage_class
= sc_none
;
10620 else if (storage_class
== sc_extern
&& funcdef_flag
10621 && ! toplevel_bindings_p ())
10622 error ("nested function %qs declared %<extern%>", name
);
10623 else if (toplevel_bindings_p ())
10625 if (storage_class
== sc_auto
)
10626 error ("top-level declaration of %qs specifies %<auto%>", name
);
10629 && storage_class
!= sc_extern
10630 && storage_class
!= sc_static
)
10632 if (declspecs
->gnu_thread_keyword_p
)
10633 pedwarn (input_location
, 0, "function-scope %qs implicitly auto and "
10634 "declared %<__thread%>", name
);
10636 /* When thread_local is applied to a variable of block scope the
10637 storage-class-specifier static is implied if it does not appear
10639 storage_class
= declspecs
->storage_class
= sc_static
;
10643 if (storage_class
&& friendp
)
10645 error ("storage class specifiers invalid in friend function declarations");
10646 storage_class
= sc_none
;
10650 if (!id_declarator
)
10651 unqualified_id
= NULL_TREE
;
10654 unqualified_id
= id_declarator
->u
.id
.unqualified_name
;
10655 switch (TREE_CODE (unqualified_id
))
10658 unqualified_id
= TREE_OPERAND (unqualified_id
, 0);
10659 if (TYPE_P (unqualified_id
))
10660 unqualified_id
= constructor_name (unqualified_id
);
10663 case IDENTIFIER_NODE
:
10664 case TEMPLATE_ID_EXPR
:
10668 gcc_unreachable ();
10672 if (declspecs
->std_attributes
)
10674 /* Apply the c++11 attributes to the type preceding them. */
10675 input_location
= declspecs
->locations
[ds_std_attribute
];
10676 decl_attributes (&type
, declspecs
->std_attributes
, 0);
10677 input_location
= saved_loc
;
10680 /* Determine the type of the entity declared by recurring on the
10682 for (; declarator
; declarator
= declarator
->declarator
)
10684 const cp_declarator
*inner_declarator
;
10687 if (type
== error_mark_node
)
10688 return error_mark_node
;
10690 attrs
= declarator
->attributes
;
10696 if (declarator
== NULL
|| declarator
->kind
== cdk_id
)
10697 attr_flags
|= (int) ATTR_FLAG_DECL_NEXT
;
10698 if (declarator
->kind
== cdk_function
)
10699 attr_flags
|= (int) ATTR_FLAG_FUNCTION_NEXT
;
10700 if (declarator
->kind
== cdk_array
)
10701 attr_flags
|= (int) ATTR_FLAG_ARRAY_NEXT
;
10702 returned_attrs
= decl_attributes (&type
,
10703 chainon (returned_attrs
, attrs
),
10707 if (declarator
->kind
== cdk_id
|| declarator
->kind
== cdk_decomp
)
10710 inner_declarator
= declarator
->declarator
;
10712 switch (declarator
->kind
)
10715 type
= create_array_type_for_decl (dname
, type
,
10716 declarator
->u
.array
.bounds
);
10717 if (!valid_array_size_p (input_location
, type
, dname
))
10718 type
= error_mark_node
;
10720 if (declarator
->std_attributes
)
10723 The optional attribute-specifier-seq appertains to the
10725 returned_attrs
= chainon (returned_attrs
,
10726 declarator
->std_attributes
);
10734 /* Declaring a function type.
10735 Make sure we have a valid type for the function to return. */
10737 if (type_quals
!= TYPE_UNQUALIFIED
)
10739 if (SCALAR_TYPE_P (type
) || VOID_TYPE_P (type
))
10741 warning_at (typespec_loc
, OPT_Wignored_qualifiers
, "type "
10742 "qualifiers ignored on function return type");
10744 /* We now know that the TYPE_QUALS don't apply to the
10745 decl, but to its return type. */
10746 type_quals
= TYPE_UNQUALIFIED
;
10749 /* Error about some types functions can't return. */
10751 if (TREE_CODE (type
) == FUNCTION_TYPE
)
10753 error ("%qs declared as function returning a function", name
);
10754 return error_mark_node
;
10756 if (TREE_CODE (type
) == ARRAY_TYPE
)
10758 error ("%qs declared as function returning an array", name
);
10759 return error_mark_node
;
10762 input_location
= declspecs
->locations
[ds_type_spec
];
10763 abstract_virtuals_error (ACU_RETURN
, type
);
10764 input_location
= saved_loc
;
10766 /* Pick up type qualifiers which should be applied to `this'. */
10767 memfn_quals
= declarator
->u
.function
.qualifiers
;
10768 /* Pick up virt-specifiers. */
10769 virt_specifiers
= declarator
->u
.function
.virt_specifiers
;
10770 /* And ref-qualifier, too */
10771 rqual
= declarator
->u
.function
.ref_qualifier
;
10772 /* And tx-qualifier. */
10773 tree tx_qual
= declarator
->u
.function
.tx_qualifier
;
10774 /* Pick up the exception specifications. */
10775 raises
= declarator
->u
.function
.exception_specification
;
10776 /* If the exception-specification is ill-formed, let's pretend
10777 there wasn't one. */
10778 if (raises
== error_mark_node
)
10779 raises
= NULL_TREE
;
10782 error_at (location_of (reqs
), "requires-clause on return type");
10783 reqs
= declarator
->u
.function
.requires_clause
;
10785 /* Say it's a definition only for the CALL_EXPR
10786 closest to the identifier. */
10787 funcdecl_p
= inner_declarator
&& inner_declarator
->kind
== cdk_id
;
10789 /* Handle a late-specified return type. */
10790 tree late_return_type
= declarator
->u
.function
.late_return_type
;
10793 if (tree auto_node
= type_uses_auto (type
))
10795 if (!late_return_type
)
10797 if (current_class_type
10798 && LAMBDA_TYPE_P (current_class_type
))
10799 /* OK for C++11 lambdas. */;
10800 else if (cxx_dialect
< cxx14
)
10802 error ("%qs function uses "
10803 "%<auto%> type specifier without trailing "
10804 "return type", name
);
10805 inform (input_location
, "deduced return type "
10806 "only available with -std=c++14 or "
10811 error ("virtual function cannot "
10812 "have deduced return type");
10816 else if (!is_auto (type
) && sfk
!= sfk_conversion
)
10818 error ("%qs function with trailing return type has"
10819 " %qT as its type rather than plain %<auto%>",
10821 return error_mark_node
;
10823 if (tree tmpl
= CLASS_PLACEHOLDER_TEMPLATE (auto_node
))
10825 if (!late_return_type
)
10827 if (dguide_name_p (unqualified_id
))
10828 error_at (typespec_loc
, "deduction guide for "
10829 "%qT must have trailing return type",
10832 error_at (typespec_loc
, "deduced class type %qT "
10833 "in function return type", type
);
10834 inform (DECL_SOURCE_LOCATION (tmpl
),
10835 "%qD declared here", tmpl
);
10837 else if (CLASS_TYPE_P (late_return_type
)
10838 && CLASSTYPE_TEMPLATE_INFO (late_return_type
)
10839 && (CLASSTYPE_TI_TEMPLATE (late_return_type
)
10843 error ("trailing return type %qT of deduction guide "
10844 "is not a specialization of %qT",
10845 late_return_type
, TREE_TYPE (tmpl
));
10848 else if (late_return_type
10849 && sfk
!= sfk_conversion
)
10851 if (cxx_dialect
< cxx11
)
10852 /* Not using maybe_warn_cpp0x because this should
10853 always be an error. */
10854 error ("trailing return type only available with "
10855 "-std=c++11 or -std=gnu++11");
10857 error ("%qs function with trailing return type not "
10858 "declared with %<auto%> type specifier", name
);
10859 return error_mark_node
;
10862 type
= splice_late_return_type (type
, late_return_type
);
10863 if (type
== error_mark_node
)
10864 return error_mark_node
;
10866 if (late_return_type
)
10867 late_return_type_p
= true;
10869 if (ctype
== NULL_TREE
10870 && decl_context
== FIELD
10873 ctype
= current_class_type
;
10875 if (ctype
&& (sfk
== sfk_constructor
10876 || sfk
== sfk_destructor
))
10878 /* We are within a class's scope. If our declarator name
10879 is the same as the class name, and we are defining
10880 a function, then it is a constructor/destructor, and
10881 therefore returns a void type. */
10883 /* ISO C++ 12.4/2. A destructor may not be declared
10884 const or volatile. A destructor may not be static.
10885 A destructor may not be declared with ref-qualifier.
10887 ISO C++ 12.1. A constructor may not be declared
10888 const or volatile. A constructor may not be
10889 virtual. A constructor may not be static.
10890 A constructor may not be declared with ref-qualifier. */
10892 error ((flags
== DTOR_FLAG
)
10893 ? G_("destructor cannot be static member function")
10894 : G_("constructor cannot be static member function"));
10897 error ((flags
== DTOR_FLAG
)
10898 ? G_("destructors may not be cv-qualified")
10899 : G_("constructors may not be cv-qualified"));
10900 memfn_quals
= TYPE_UNQUALIFIED
;
10905 maybe_warn_cpp0x (CPP0X_REF_QUALIFIER
);
10906 error ((flags
== DTOR_FLAG
)
10907 ? "destructors may not be ref-qualified"
10908 : "constructors may not be ref-qualified");
10909 rqual
= REF_QUAL_NONE
;
10912 if (decl_context
== FIELD
10913 && !member_function_or_else (ctype
,
10914 current_class_type
,
10916 return error_mark_node
;
10918 if (flags
!= DTOR_FLAG
)
10920 /* It's a constructor. */
10921 if (explicitp
== 1)
10925 permerror (input_location
,
10926 "constructors cannot be declared %<virtual%>");
10929 if (decl_context
== FIELD
10930 && sfk
!= sfk_constructor
)
10931 return error_mark_node
;
10933 if (decl_context
== FIELD
)
10940 /* Cannot be both friend and virtual. */
10941 error ("virtual functions cannot be friends");
10944 if (decl_context
== NORMAL
)
10945 error ("friend declaration not in class definition");
10946 if (current_function_decl
&& funcdef_flag
)
10947 error ("can%'t define friend function %qs in a local "
10948 "class definition",
10951 else if (ctype
&& sfk
== sfk_conversion
)
10953 if (explicitp
== 1)
10955 maybe_warn_cpp0x (CPP0X_EXPLICIT_CONVERSION
);
10958 if (late_return_type_p
)
10959 error ("a conversion function cannot have a trailing return type");
10962 arg_types
= grokparms (declarator
->u
.function
.parameters
,
10965 if (inner_declarator
10966 && inner_declarator
->kind
== cdk_id
10967 && inner_declarator
->u
.id
.sfk
== sfk_destructor
10968 && arg_types
!= void_list_node
)
10970 error ("destructors may not have parameters");
10971 arg_types
= void_list_node
;
10975 type
= build_function_type (type
, arg_types
);
10977 tree attrs
= declarator
->std_attributes
;
10980 tree att
= build_tree_list (tx_qual
, NULL_TREE
);
10981 /* transaction_safe applies to the type, but
10982 transaction_safe_dynamic applies to the function. */
10983 if (is_attribute_p ("transaction_safe", tx_qual
))
10984 attrs
= chainon (attrs
, att
);
10986 returned_attrs
= chainon (returned_attrs
, att
);
10991 The optional attribute-specifier-seq appertains to
10992 the function type. */
10993 decl_attributes (&type
, attrs
, 0);
10996 type
= build_exception_variant (type
, raises
);
11001 case cdk_reference
:
11003 /* Filter out pointers-to-references and references-to-references.
11004 We can get these if a TYPE_DECL is used. */
11006 if (TREE_CODE (type
) == REFERENCE_TYPE
)
11008 if (declarator
->kind
!= cdk_reference
)
11010 error ("cannot declare pointer to %q#T", type
);
11011 type
= TREE_TYPE (type
);
11014 /* In C++0x, we allow reference to reference declarations
11015 that occur indirectly through typedefs [7.1.3/8 dcl.typedef]
11016 and template type arguments [14.3.1/4 temp.arg.type]. The
11017 check for direct reference to reference declarations, which
11018 are still forbidden, occurs below. Reasoning behind the change
11019 can be found in DR106, DR540, and the rvalue reference
11021 else if (cxx_dialect
== cxx98
)
11023 error ("cannot declare reference to %q#T", type
);
11024 type
= TREE_TYPE (type
);
11027 else if (VOID_TYPE_P (type
))
11029 if (declarator
->kind
== cdk_reference
)
11030 error ("cannot declare reference to %q#T", type
);
11031 else if (declarator
->kind
== cdk_ptrmem
)
11032 error ("cannot declare pointer to %q#T member", type
);
11035 /* We now know that the TYPE_QUALS don't apply to the decl,
11036 but to the target of the pointer. */
11037 type_quals
= TYPE_UNQUALIFIED
;
11039 /* This code used to handle METHOD_TYPE, but I don't think it's
11040 possible to get it here anymore. */
11041 gcc_assert (TREE_CODE (type
) != METHOD_TYPE
);
11042 if (declarator
->kind
== cdk_ptrmem
11043 && TREE_CODE (type
) == FUNCTION_TYPE
)
11045 memfn_quals
|= type_memfn_quals (type
);
11046 type
= build_memfn_type (type
,
11047 declarator
->u
.pointer
.class_type
,
11050 if (type
== error_mark_node
)
11051 return error_mark_node
;
11053 rqual
= REF_QUAL_NONE
;
11054 memfn_quals
= TYPE_UNQUALIFIED
;
11057 if (TREE_CODE (type
) == FUNCTION_TYPE
11058 && (type_memfn_quals (type
) != TYPE_UNQUALIFIED
11059 || type_memfn_rqual (type
) != REF_QUAL_NONE
))
11060 error (declarator
->kind
== cdk_reference
11061 ? G_("cannot declare reference to qualified function type %qT")
11062 : G_("cannot declare pointer to qualified function type %qT"),
11065 /* When the pointed-to type involves components of variable size,
11066 care must be taken to ensure that the size evaluation code is
11067 emitted early enough to dominate all the possible later uses
11068 and late enough for the variables on which it depends to have
11071 This is expected to happen automatically when the pointed-to
11072 type has a name/declaration of it's own, but special attention
11073 is required if the type is anonymous.
11075 We handle the NORMAL and FIELD contexts here by inserting a
11076 dummy statement that just evaluates the size at a safe point
11077 and ensures it is not deferred until e.g. within a deeper
11078 conditional context (c++/43555).
11080 We expect nothing to be needed here for PARM or TYPENAME.
11081 Evaluating the size at this point for TYPENAME would
11082 actually be incorrect, as we might be in the middle of an
11083 expression with side effects on the pointed-to type size
11084 "arguments" prior to the pointer declaration point and the
11085 size evaluation could end up prior to the side effects. */
11087 if (!TYPE_NAME (type
)
11088 && (decl_context
== NORMAL
|| decl_context
== FIELD
)
11089 && at_function_scope_p ()
11090 && variably_modified_type_p (type
, NULL_TREE
))
11092 TYPE_NAME (type
) = build_decl (UNKNOWN_LOCATION
, TYPE_DECL
,
11094 add_decl_expr (TYPE_NAME (type
));
11097 if (declarator
->kind
== cdk_reference
)
11099 /* In C++0x, the type we are creating a reference to might be
11100 a typedef which is itself a reference type. In that case,
11101 we follow the reference collapsing rules in
11102 [7.1.3/8 dcl.typedef] to create the final reference type:
11104 "If a typedef TD names a type that is a reference to a type
11105 T, an attempt to create the type 'lvalue reference to cv TD'
11106 creates the type 'lvalue reference to T,' while an attempt
11107 to create the type "rvalue reference to cv TD' creates the
11110 if (VOID_TYPE_P (type
))
11111 /* We already gave an error. */;
11112 else if (TREE_CODE (type
) == REFERENCE_TYPE
)
11114 if (declarator
->u
.reference
.rvalue_ref
)
11115 /* Leave type alone. */;
11117 type
= cp_build_reference_type (TREE_TYPE (type
), false);
11120 type
= cp_build_reference_type
11121 (type
, declarator
->u
.reference
.rvalue_ref
);
11123 /* In C++0x, we need this check for direct reference to
11124 reference declarations, which are forbidden by
11125 [8.3.2/5 dcl.ref]. Reference to reference declarations
11126 are only allowed indirectly through typedefs and template
11127 type arguments. Example:
11129 void foo(int & &); // invalid ref-to-ref decl
11131 typedef int & int_ref;
11132 void foo(int_ref &); // valid ref-to-ref decl
11134 if (inner_declarator
&& inner_declarator
->kind
== cdk_reference
)
11135 error ("cannot declare reference to %q#T, which is not "
11136 "a typedef or a template type argument", type
);
11138 else if (TREE_CODE (type
) == METHOD_TYPE
)
11139 type
= build_ptrmemfunc_type (build_pointer_type (type
));
11140 else if (declarator
->kind
== cdk_ptrmem
)
11142 gcc_assert (TREE_CODE (declarator
->u
.pointer
.class_type
)
11143 != NAMESPACE_DECL
);
11144 if (declarator
->u
.pointer
.class_type
== error_mark_node
)
11145 /* We will already have complained. */
11146 type
= error_mark_node
;
11148 type
= build_ptrmem_type (declarator
->u
.pointer
.class_type
,
11152 type
= build_pointer_type (type
);
11154 /* Process a list of type modifier keywords (such as
11155 const or volatile) that were given inside the `*' or `&'. */
11157 if (declarator
->u
.pointer
.qualifiers
)
11160 = cp_build_qualified_type (type
,
11161 declarator
->u
.pointer
.qualifiers
);
11162 type_quals
= cp_type_quals (type
);
11165 /* Apply C++11 attributes to the pointer, and not to the
11166 type pointed to. This is unlike what is done for GNU
11167 attributes above. It is to comply with [dcl.ptr]/1:
11169 [the optional attribute-specifier-seq (7.6.1) appertains
11170 to the pointer and not to the object pointed to]. */
11171 if (declarator
->std_attributes
)
11172 decl_attributes (&type
, declarator
->std_attributes
,
11182 gcc_unreachable ();
11186 /* A `constexpr' specifier used in an object declaration declares
11187 the object as `const'. */
11188 if (constexpr_p
&& innermost_code
!= cdk_function
)
11190 /* DR1688 says that a `constexpr' specifier in combination with
11191 `volatile' is valid. */
11193 if (TREE_CODE (type
) != REFERENCE_TYPE
)
11195 type_quals
|= TYPE_QUAL_CONST
;
11196 type
= cp_build_qualified_type (type
, type_quals
);
11200 if (unqualified_id
&& TREE_CODE (unqualified_id
) == TEMPLATE_ID_EXPR
11201 && TREE_CODE (type
) != FUNCTION_TYPE
11202 && TREE_CODE (type
) != METHOD_TYPE
11203 && !variable_template_p (TREE_OPERAND (unqualified_id
, 0)))
11205 error ("template-id %qD used as a declarator",
11207 unqualified_id
= dname
;
11210 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
11211 qualified with a class-name, turn it into a METHOD_TYPE, unless
11212 we know that the function is static. We take advantage of this
11213 opportunity to do other processing that pertains to entities
11214 explicitly declared to be class members. Note that if DECLARATOR
11215 is non-NULL, we know it is a cdk_id declarator; otherwise, we
11216 would not have exited the loop above. */
11218 && declarator
->kind
== cdk_id
11219 && declarator
->u
.id
.qualifying_scope
11220 && MAYBE_CLASS_TYPE_P (declarator
->u
.id
.qualifying_scope
))
11222 ctype
= declarator
->u
.id
.qualifying_scope
;
11223 ctype
= TYPE_MAIN_VARIANT (ctype
);
11224 template_count
= num_template_headers_for_class (ctype
);
11226 if (ctype
== current_class_type
)
11230 permerror (input_location
, "member functions are implicitly "
11231 "friends of their class");
11235 permerror (declarator
->id_loc
,
11236 "extra qualification %<%T::%> on member %qs",
11239 else if (/* If the qualifying type is already complete, then we
11240 can skip the following checks. */
11241 !COMPLETE_TYPE_P (ctype
)
11242 && (/* If the function is being defined, then
11243 qualifying type must certainly be complete. */
11245 /* A friend declaration of "T::f" is OK, even if
11246 "T" is a template parameter. But, if this
11247 function is not a friend, the qualifying type
11248 must be a class. */
11249 || (!friendp
&& !CLASS_TYPE_P (ctype
))
11250 /* For a declaration, the type need not be
11251 complete, if either it is dependent (since there
11252 is no meaningful definition of complete in that
11253 case) or the qualifying class is currently being
11255 || !(dependent_type_p (ctype
)
11256 || currently_open_class (ctype
)))
11257 /* Check that the qualifying type is complete. */
11258 && !complete_type_or_else (ctype
, NULL_TREE
))
11259 return error_mark_node
;
11260 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
11262 if (current_class_type
11263 && (!friendp
|| funcdef_flag
))
11265 error (funcdef_flag
11266 ? G_("cannot define member function %<%T::%s%> "
11268 : G_("cannot declare member function %<%T::%s%> "
11270 ctype
, name
, current_class_type
);
11271 return error_mark_node
;
11274 else if (typedef_p
&& current_class_type
)
11276 error ("cannot declare member %<%T::%s%> within %qT",
11277 ctype
, name
, current_class_type
);
11278 return error_mark_node
;
11282 if (ctype
== NULL_TREE
&& decl_context
== FIELD
&& friendp
== 0)
11283 ctype
= current_class_type
;
11285 /* Now TYPE has the actual type. */
11287 if (returned_attrs
)
11290 *attrlist
= chainon (returned_attrs
, *attrlist
);
11292 attrlist
= &returned_attrs
;
11296 && declarator
->kind
== cdk_id
11297 && declarator
->std_attributes
)
11298 /* [dcl.meaning]/1: The optional attribute-specifier-seq following
11299 a declarator-id appertains to the entity that is declared. */
11300 *attrlist
= chainon (*attrlist
, declarator
->std_attributes
);
11302 /* Handle parameter packs. */
11303 if (parameter_pack_p
)
11305 if (decl_context
== PARM
)
11306 /* Turn the type into a pack expansion.*/
11307 type
= make_pack_expansion (type
);
11309 error ("non-parameter %qs cannot be a parameter pack", name
);
11312 if ((decl_context
== FIELD
|| decl_context
== PARM
)
11313 && !processing_template_decl
11314 && variably_modified_type_p (type
, NULL_TREE
))
11316 if (decl_context
== FIELD
)
11317 error ("data member may not have variably modified type %qT", type
);
11319 error ("parameter may not have variably modified type %qT", type
);
11320 type
= error_mark_node
;
11323 if (explicitp
== 1 || (explicitp
&& friendp
))
11325 /* [dcl.fct.spec] (C++11) The explicit specifier shall be used only
11326 in the declaration of a constructor or conversion function within
11327 a class definition. */
11328 if (!current_class_type
)
11329 error_at (declspecs
->locations
[ds_explicit
],
11330 "%<explicit%> outside class declaration");
11332 error_at (declspecs
->locations
[ds_explicit
],
11333 "%<explicit%> in friend declaration");
11335 error_at (declspecs
->locations
[ds_explicit
],
11336 "only declarations of constructors and conversion operators "
11337 "can be %<explicit%>");
11341 if (storage_class
== sc_mutable
)
11343 if (decl_context
!= FIELD
|| friendp
)
11345 error ("non-member %qs cannot be declared %<mutable%>", name
);
11346 storage_class
= sc_none
;
11348 else if (decl_context
== TYPENAME
|| typedef_p
)
11350 error ("non-object member %qs cannot be declared %<mutable%>", name
);
11351 storage_class
= sc_none
;
11353 else if (TREE_CODE (type
) == FUNCTION_TYPE
11354 || TREE_CODE (type
) == METHOD_TYPE
)
11356 error ("function %qs cannot be declared %<mutable%>", name
);
11357 storage_class
= sc_none
;
11361 error ("static %qs cannot be declared %<mutable%>", name
);
11362 storage_class
= sc_none
;
11364 else if (type_quals
& TYPE_QUAL_CONST
)
11366 error ("const %qs cannot be declared %<mutable%>", name
);
11367 storage_class
= sc_none
;
11369 else if (TREE_CODE (type
) == REFERENCE_TYPE
)
11371 permerror (input_location
, "reference %qs cannot be declared "
11372 "%<mutable%>", name
);
11373 storage_class
= sc_none
;
11377 /* If this is declaring a typedef name, return a TYPE_DECL. */
11378 if (typedef_p
&& decl_context
!= TYPENAME
)
11382 /* This declaration:
11384 typedef void f(int) const;
11386 declares a function type which is not a member of any
11387 particular class, but which is cv-qualified; for
11388 example "f S::*" declares a pointer to a const-qualified
11389 member function of S. We record the cv-qualification in the
11391 if ((rqual
|| memfn_quals
) && TREE_CODE (type
) == FUNCTION_TYPE
)
11393 type
= apply_memfn_quals (type
, memfn_quals
, rqual
);
11395 /* We have now dealt with these qualifiers. */
11396 memfn_quals
= TYPE_UNQUALIFIED
;
11397 rqual
= REF_QUAL_NONE
;
11400 if (type_uses_auto (type
))
11402 error ("typedef declared %<auto%>");
11403 type
= error_mark_node
;
11407 error_at (location_of (reqs
), "requires-clause on typedef");
11409 if (decl_context
== FIELD
)
11410 decl
= build_lang_decl (TYPE_DECL
, unqualified_id
, type
);
11412 decl
= build_decl (input_location
, TYPE_DECL
, unqualified_id
, type
);
11413 if (id_declarator
&& declarator
->u
.id
.qualifying_scope
) {
11414 error_at (DECL_SOURCE_LOCATION (decl
),
11415 "typedef name may not be a nested-name-specifier");
11416 TREE_TYPE (decl
) = error_mark_node
;
11419 if (decl_context
!= FIELD
)
11421 if (!current_function_decl
)
11422 DECL_CONTEXT (decl
) = FROB_CONTEXT (current_namespace
);
11423 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (current_function_decl
)
11424 || (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P
11425 (current_function_decl
)))
11426 /* The TYPE_DECL is "abstract" because there will be
11427 clones of this constructor/destructor, and there will
11428 be copies of this TYPE_DECL generated in those
11429 clones. The decloning optimization (for space) may
11430 revert this subsequently if it determines that
11431 the clones should share a common implementation. */
11432 DECL_ABSTRACT_P (decl
) = true;
11434 else if (current_class_type
11435 && constructor_name_p (unqualified_id
, current_class_type
))
11436 permerror (input_location
, "ISO C++ forbids nested type %qD with same name "
11437 "as enclosing class",
11440 /* If the user declares "typedef struct {...} foo" then the
11441 struct will have an anonymous name. Fill that name in now.
11442 Nothing can refer to it, so nothing needs know about the name
11444 if (type
!= error_mark_node
11446 && TYPE_NAME (type
)
11447 && TREE_CODE (TYPE_NAME (type
)) == TYPE_DECL
11448 && TYPE_UNNAMED_P (type
)
11449 && declspecs
->type_definition_p
11450 && attributes_naming_typedef_ok (*attrlist
)
11451 && cp_type_quals (type
) == TYPE_UNQUALIFIED
)
11455 /* Replace the anonymous name with the real name everywhere. */
11456 for (t
= TYPE_MAIN_VARIANT (type
); t
; t
= TYPE_NEXT_VARIANT (t
))
11458 if (anon_aggrname_p (TYPE_IDENTIFIER (t
)))
11459 /* We do not rename the debug info representing the
11460 unnamed tagged type because the standard says in
11461 [dcl.typedef] that the naming applies only for
11462 linkage purposes. */
11463 /*debug_hooks->set_name (t, decl);*/
11464 TYPE_NAME (t
) = decl
;
11467 if (TYPE_LANG_SPECIFIC (type
))
11468 TYPE_WAS_UNNAMED (type
) = 1;
11470 /* If this is a typedef within a template class, the nested
11471 type is a (non-primary) template. The name for the
11472 template needs updating as well. */
11473 if (TYPE_LANG_SPECIFIC (type
) && CLASSTYPE_TEMPLATE_INFO (type
))
11474 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type
))
11475 = TYPE_IDENTIFIER (type
);
11477 /* Adjust linkage now that we aren't unnamed anymore. */
11478 reset_type_linkage (type
);
11480 /* FIXME remangle member functions; member functions of a
11481 type with external linkage have external linkage. */
11485 || (typedef_decl
&& C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl
)))
11486 C_TYPEDEF_EXPLICITLY_SIGNED (decl
) = 1;
11488 bad_specifiers (decl
, BSP_TYPE
, virtualp
,
11489 memfn_quals
!= TYPE_UNQUALIFIED
,
11490 inlinep
, friendp
, raises
!= NULL_TREE
);
11492 if (decl_spec_seq_has_spec_p (declspecs
, ds_alias
))
11493 /* Acknowledge that this was written:
11494 `using analias = atype;'. */
11495 TYPE_DECL_ALIAS_P (decl
) = 1;
11500 /* Detect the case of an array type of unspecified size
11501 which came, as such, direct from a typedef name.
11502 We must copy the type, so that the array's domain can be
11503 individually set by the object's initializer. */
11505 if (type
&& typedef_type
11506 && TREE_CODE (type
) == ARRAY_TYPE
&& !TYPE_DOMAIN (type
)
11507 && TYPE_MAIN_VARIANT (type
) == TYPE_MAIN_VARIANT (typedef_type
))
11508 type
= build_cplus_array_type (TREE_TYPE (type
), NULL_TREE
);
11510 /* Detect where we're using a typedef of function type to declare a
11511 function. PARMS will not be set, so we must create it now. */
11513 if (type
== typedef_type
&& TREE_CODE (type
) == FUNCTION_TYPE
)
11515 tree decls
= NULL_TREE
;
11518 for (args
= TYPE_ARG_TYPES (type
);
11519 args
&& args
!= void_list_node
;
11520 args
= TREE_CHAIN (args
))
11522 tree decl
= cp_build_parm_decl (NULL_TREE
, TREE_VALUE (args
));
11524 DECL_CHAIN (decl
) = decls
;
11528 parms
= nreverse (decls
);
11530 if (decl_context
!= TYPENAME
)
11532 /* The qualifiers on the function type become the qualifiers on
11533 the non-static member function. */
11534 memfn_quals
|= type_memfn_quals (type
);
11535 rqual
= type_memfn_rqual (type
);
11536 type_quals
= TYPE_UNQUALIFIED
;
11540 /* If this is a type name (such as, in a cast or sizeof),
11541 compute the type and return it now. */
11543 if (decl_context
== TYPENAME
)
11545 /* Note that here we don't care about type_quals. */
11547 /* Special case: "friend class foo" looks like a TYPENAME context. */
11552 error ("%<inline%> specified for friend class declaration");
11558 /* Don't allow friend declaration without a class-key. */
11559 if (TREE_CODE (type
) == TEMPLATE_TYPE_PARM
)
11560 permerror (input_location
, "template parameters cannot be friends");
11561 else if (TREE_CODE (type
) == TYPENAME_TYPE
)
11562 permerror (input_location
, "friend declaration requires class-key, "
11563 "i.e. %<friend class %T::%D%>",
11564 TYPE_CONTEXT (type
), TYPENAME_TYPE_FULLNAME (type
));
11566 permerror (input_location
, "friend declaration requires class-key, "
11567 "i.e. %<friend %#T%>",
11571 /* Only try to do this stuff if we didn't already give up. */
11572 if (type
!= integer_type_node
)
11574 /* A friendly class? */
11575 if (current_class_type
)
11576 make_friend_class (current_class_type
, TYPE_MAIN_VARIANT (type
),
11577 /*complain=*/true);
11579 error ("trying to make class %qT a friend of global scope",
11582 type
= void_type_node
;
11585 else if (memfn_quals
|| rqual
)
11587 if (ctype
== NULL_TREE
11588 && TREE_CODE (type
) == METHOD_TYPE
)
11589 ctype
= TYPE_METHOD_BASETYPE (type
);
11592 type
= build_memfn_type (type
, ctype
, memfn_quals
, rqual
);
11593 /* Core issue #547: need to allow this in template type args.
11594 Allow it in general in C++11 for alias-declarations. */
11595 else if ((template_type_arg
|| cxx_dialect
>= cxx11
)
11596 && TREE_CODE (type
) == FUNCTION_TYPE
)
11597 type
= apply_memfn_quals (type
, memfn_quals
, rqual
);
11599 error ("invalid qualifiers on non-member function type");
11603 error_at (location_of (reqs
), "requires-clause on type-id");
11607 else if (unqualified_id
== NULL_TREE
&& decl_context
!= PARM
11608 && decl_context
!= CATCHPARM
11609 && TREE_CODE (type
) != UNION_TYPE
11611 && innermost_code
!= cdk_decomp
)
11613 error ("abstract declarator %qT used as declaration", type
);
11614 return error_mark_node
;
11617 /* Only functions may be declared using an operator-function-id. */
11619 && IDENTIFIER_OPNAME_P (unqualified_id
)
11620 && TREE_CODE (type
) != FUNCTION_TYPE
11621 && TREE_CODE (type
) != METHOD_TYPE
)
11623 error ("declaration of %qD as non-function", unqualified_id
);
11624 return error_mark_node
;
11628 && TREE_CODE (type
) != FUNCTION_TYPE
11629 && TREE_CODE (type
) != METHOD_TYPE
)
11630 error_at (location_of (reqs
),
11631 "requires-clause on declaration of non-function type %qT",
11634 /* We don't check parameter types here because we can emit a better
11635 error message later. */
11636 if (decl_context
!= PARM
)
11638 type
= check_var_type (unqualified_id
, type
);
11639 if (type
== error_mark_node
)
11640 return error_mark_node
;
11643 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
11644 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
11646 if (decl_context
== PARM
|| decl_context
== CATCHPARM
)
11648 if (ctype
|| in_namespace
)
11649 error ("cannot use %<::%> in parameter declaration");
11651 if (type_uses_auto (type
)
11652 && !(cxx_dialect
>= cxx1z
&& template_parm_flag
))
11654 if (cxx_dialect
>= cxx14
)
11655 error ("%<auto%> parameter not permitted in this context");
11657 error ("parameter declared %<auto%>");
11658 type
= error_mark_node
;
11661 /* A parameter declared as an array of T is really a pointer to T.
11662 One declared as a function is really a pointer to a function.
11663 One declared as a member is really a pointer to member. */
11665 if (TREE_CODE (type
) == ARRAY_TYPE
)
11667 /* Transfer const-ness of array into that of type pointed to. */
11668 type
= build_pointer_type (TREE_TYPE (type
));
11669 type_quals
= TYPE_UNQUALIFIED
;
11670 array_parameter_p
= true;
11672 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
11673 type
= build_pointer_type (type
);
11676 if (ctype
&& TREE_CODE (type
) == FUNCTION_TYPE
&& staticp
< 2
11677 && !NEW_DELETE_OPNAME_P (unqualified_id
))
11679 cp_cv_quals real_quals
= memfn_quals
;
11680 if (cxx_dialect
< cxx14
&& constexpr_p
11681 && sfk
!= sfk_constructor
&& sfk
!= sfk_destructor
)
11682 real_quals
|= TYPE_QUAL_CONST
;
11683 type
= build_memfn_type (type
, ctype
, real_quals
, rqual
);
11687 tree decl
= NULL_TREE
;
11689 if (decl_context
== PARM
)
11691 decl
= cp_build_parm_decl (unqualified_id
, type
);
11692 DECL_ARRAY_PARAMETER_P (decl
) = array_parameter_p
;
11694 bad_specifiers (decl
, BSP_PARM
, virtualp
,
11695 memfn_quals
!= TYPE_UNQUALIFIED
,
11696 inlinep
, friendp
, raises
!= NULL_TREE
);
11698 else if (decl_context
== FIELD
)
11700 if (!staticp
&& !friendp
&& TREE_CODE (type
) != METHOD_TYPE
)
11701 if (tree auto_node
= type_uses_auto (type
))
11703 location_t loc
= declspecs
->locations
[ds_type_spec
];
11704 if (CLASS_PLACEHOLDER_TEMPLATE (auto_node
))
11705 error_at (loc
, "invalid use of template-name %qE without an "
11707 CLASS_PLACEHOLDER_TEMPLATE (auto_node
));
11709 error_at (loc
, "non-static data member declared with "
11710 "placeholder %qT", auto_node
);
11711 type
= error_mark_node
;
11714 /* The C99 flexible array extension. */
11715 if (!staticp
&& TREE_CODE (type
) == ARRAY_TYPE
11716 && TYPE_DOMAIN (type
) == NULL_TREE
)
11719 && (TREE_CODE (ctype
) == UNION_TYPE
11720 || TREE_CODE (ctype
) == QUAL_UNION_TYPE
))
11722 error ("flexible array member in union");
11723 type
= error_mark_node
;
11727 /* Flexible array member has a null domain. */
11728 type
= build_cplus_array_type (TREE_TYPE (type
), NULL_TREE
);
11732 if (type
== error_mark_node
)
11734 /* Happens when declaring arrays of sizes which
11735 are error_mark_node, for example. */
11738 else if (in_namespace
&& !friendp
)
11740 /* Something like struct S { int N::j; }; */
11741 error ("invalid use of %<::%>");
11742 return error_mark_node
;
11744 else if (TREE_CODE (type
) == FUNCTION_TYPE
11745 || TREE_CODE (type
) == METHOD_TYPE
)
11748 tree function_context
;
11752 /* This should never happen in pure C++ (the check
11753 could be an assert). It could happen in
11754 Objective-C++ if someone writes invalid code that
11755 uses a function declaration for an instance
11756 variable or property (instance variables and
11757 properties are parsed as FIELD_DECLs, but they are
11758 part of an Objective-C class, not a C++ class).
11759 That code is invalid and is caught by this
11763 error ("declaration of function %qD in invalid context",
11765 return error_mark_node
;
11768 /* ``A union may [ ... ] not [ have ] virtual functions.''
11770 if (virtualp
&& TREE_CODE (ctype
) == UNION_TYPE
)
11772 error ("function %qD declared %<virtual%> inside a union",
11774 return error_mark_node
;
11777 if (NEW_DELETE_OPNAME_P (unqualified_id
))
11781 error ("%qD cannot be declared %<virtual%>, since it "
11782 "is always static",
11789 /* Check that the name used for a destructor makes sense. */
11790 if (sfk
== sfk_destructor
)
11792 tree uqname
= id_declarator
->u
.id
.unqualified_name
;
11796 gcc_assert (friendp
);
11797 error ("expected qualified name in friend declaration "
11798 "for destructor %qD", uqname
);
11799 return error_mark_node
;
11802 if (!check_dtor_name (ctype
, TREE_OPERAND (uqname
, 0)))
11804 error ("declaration of %qD as member of %qT",
11806 return error_mark_node
;
11810 error ("a destructor cannot be %<concept%>");
11811 return error_mark_node
;
11815 error ("a destructor cannot be %<constexpr%>");
11816 return error_mark_node
;
11819 else if (sfk
== sfk_constructor
&& friendp
&& !ctype
)
11821 error ("expected qualified name in friend declaration "
11822 "for constructor %qD",
11823 id_declarator
->u
.id
.unqualified_name
);
11824 return error_mark_node
;
11826 if (sfk
== sfk_constructor
)
11829 error ("a constructor cannot be %<concept%>");
11830 return error_mark_node
;
11834 error ("a concept cannot be a member function");
11838 if (TREE_CODE (unqualified_id
) == TEMPLATE_ID_EXPR
)
11840 tree tmpl
= TREE_OPERAND (unqualified_id
, 0);
11841 if (variable_template_p (tmpl
))
11843 error ("specialization of variable template %qD "
11844 "declared as function", tmpl
);
11845 inform (DECL_SOURCE_LOCATION (tmpl
),
11846 "variable template declared here");
11847 return error_mark_node
;
11851 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
11852 function_context
= (ctype
!= NULL_TREE
) ?
11853 decl_function_context (TYPE_MAIN_DECL (ctype
)) : NULL_TREE
;
11854 publicp
= (! friendp
|| ! staticp
)
11855 && function_context
== NULL_TREE
;
11857 if (late_return_type_p
)
11858 TYPE_HAS_LATE_RETURN_TYPE (type
) = 1;
11860 decl
= grokfndecl (ctype
, type
,
11861 TREE_CODE (unqualified_id
) != TEMPLATE_ID_EXPR
11862 ? unqualified_id
: dname
,
11866 virtualp
, flags
, memfn_quals
, rqual
, raises
,
11867 friendp
? -1 : 0, friendp
, publicp
,
11868 inlinep
| (2 * constexpr_p
) | (4 * concept_p
),
11869 initialized
== SD_DELETED
, sfk
,
11870 funcdef_flag
, template_count
, in_namespace
,
11871 attrlist
, declarator
->id_loc
);
11872 decl
= set_virt_specifiers (decl
, virt_specifiers
);
11873 if (decl
== NULL_TREE
)
11874 return error_mark_node
;
11876 /* This clobbers the attrs stored in `decl' from `attrlist'. */
11877 /* The decl and setting of decl_attr is also turned off. */
11878 decl
= build_decl_attribute_variant (decl
, decl_attr
);
11881 /* [class.conv.ctor]
11883 A constructor declared without the function-specifier
11884 explicit that can be called with a single parameter
11885 specifies a conversion from the type of its first
11886 parameter to the type of its class. Such a constructor
11887 is called a converting constructor. */
11888 if (explicitp
== 2)
11889 DECL_NONCONVERTING_P (decl
) = 1;
11891 else if (!staticp
&& !dependent_type_p (type
)
11892 && !COMPLETE_TYPE_P (complete_type (type
))
11893 && (!complete_or_array_type_p (type
)
11894 || initialized
== 0))
11896 if (TREE_CODE (type
) != ARRAY_TYPE
11897 || !COMPLETE_TYPE_P (TREE_TYPE (type
)))
11899 if (unqualified_id
)
11901 error ("field %qD has incomplete type %qT",
11902 unqualified_id
, type
);
11903 cxx_incomplete_type_inform (strip_array_types (type
));
11906 error ("name %qT has incomplete type", type
);
11908 type
= error_mark_node
;
11916 error ("%qE is neither function nor member function; "
11917 "cannot be declared friend", unqualified_id
);
11925 /* Friends are treated specially. */
11926 if (ctype
== current_class_type
)
11927 ; /* We already issued a permerror. */
11928 else if (decl
&& DECL_NAME (decl
))
11930 if (template_class_depth (current_class_type
) == 0)
11932 decl
= check_explicit_specialization
11933 (unqualified_id
, decl
, template_count
,
11934 2 * funcdef_flag
+ 4);
11935 if (decl
== error_mark_node
)
11936 return error_mark_node
;
11939 decl
= do_friend (ctype
, unqualified_id
, decl
,
11945 return error_mark_node
;
11948 /* Structure field. It may not be a function, except for C++. */
11950 if (decl
== NULL_TREE
)
11954 /* C++ allows static class members. All other work
11955 for this is done by grokfield. */
11956 decl
= build_lang_decl_loc (declarator
11957 ? declarator
->id_loc
11959 VAR_DECL
, unqualified_id
, type
);
11960 set_linkage_for_static_data_member (decl
);
11963 CP_DECL_THREAD_LOCAL_P (decl
) = true;
11964 if (!processing_template_decl
)
11965 set_decl_tls_model (decl
, decl_default_tls_model (decl
));
11966 if (declspecs
->gnu_thread_keyword_p
)
11967 SET_DECL_GNU_TLS_P (decl
);
11970 error ("static data member %qE declared %<concept%>",
11972 else if (constexpr_p
&& !initialized
)
11974 error ("constexpr static data member %qD must have an "
11975 "initializer", decl
);
11976 constexpr_p
= false;
11980 mark_inline_variable (decl
);
11982 if (!DECL_VAR_DECLARED_INLINE_P (decl
)
11983 && !(cxx_dialect
>= cxx1z
&& constexpr_p
))
11984 /* Even if there is an in-class initialization, DECL
11985 is considered undefined until an out-of-class
11986 definition is provided, unless this is an inline
11988 DECL_EXTERNAL (decl
) = 1;
11993 error ("non-static data member %qE declared %<concept%>",
11995 else if (constexpr_p
)
11997 error ("non-static data member %qE declared %<constexpr%>",
11999 constexpr_p
= false;
12001 decl
= build_decl (input_location
,
12002 FIELD_DECL
, unqualified_id
, type
);
12003 DECL_NONADDRESSABLE_P (decl
) = bitfield
;
12004 if (bitfield
&& !unqualified_id
)
12005 TREE_NO_WARNING (decl
) = 1;
12007 if (storage_class
== sc_mutable
)
12009 DECL_MUTABLE_P (decl
) = 1;
12010 storage_class
= sc_none
;
12015 /* An attempt is being made to initialize a non-static
12016 member. This is new in C++11. */
12017 maybe_warn_cpp0x (CPP0X_NSDMI
);
12019 /* If this has been parsed with static storage class, but
12020 errors forced staticp to be cleared, ensure NSDMI is
12022 if (declspecs
->storage_class
== sc_static
)
12023 DECL_INITIAL (decl
) = error_mark_node
;
12027 bad_specifiers (decl
, BSP_FIELD
, virtualp
,
12028 memfn_quals
!= TYPE_UNQUALIFIED
,
12029 staticp
? false : inlinep
, friendp
,
12030 raises
!= NULL_TREE
);
12033 else if (TREE_CODE (type
) == FUNCTION_TYPE
12034 || TREE_CODE (type
) == METHOD_TYPE
)
12036 tree original_name
;
12039 if (!unqualified_id
)
12040 return error_mark_node
;
12042 if (TREE_CODE (unqualified_id
) == TEMPLATE_ID_EXPR
)
12043 original_name
= dname
;
12045 original_name
= unqualified_id
;
12047 if (storage_class
== sc_auto
)
12048 error ("storage class %<auto%> invalid for function %qs", name
);
12049 else if (storage_class
== sc_register
)
12050 error ("storage class %<register%> invalid for function %qs", name
);
12053 if (declspecs
->gnu_thread_keyword_p
)
12054 error ("storage class %<__thread%> invalid for function %qs",
12057 error ("storage class %<thread_local%> invalid for function %qs",
12061 if (virt_specifiers
)
12062 error ("virt-specifiers in %qs not allowed outside a class definition", name
);
12063 /* Function declaration not at top level.
12064 Storage classes other than `extern' are not allowed
12065 and `extern' makes no difference. */
12066 if (! toplevel_bindings_p ()
12067 && (storage_class
== sc_static
12068 || decl_spec_seq_has_spec_p (declspecs
, ds_inline
))
12071 if (storage_class
== sc_static
)
12072 pedwarn (input_location
, OPT_Wpedantic
,
12073 "%<static%> specifier invalid for function %qs "
12074 "declared out of global scope", name
);
12076 pedwarn (input_location
, OPT_Wpedantic
,
12077 "%<inline%> specifier invalid for function %qs "
12078 "declared out of global scope", name
);
12081 if (ctype
== NULL_TREE
)
12085 error ("virtual non-class function %qs", name
);
12088 else if (sfk
== sfk_constructor
12089 || sfk
== sfk_destructor
)
12091 error (funcdef_flag
12092 ? G_("%qs defined in a non-class scope")
12093 : G_("%qs declared in a non-class scope"), name
);
12098 /* Record whether the function is public. */
12099 publicp
= (ctype
!= NULL_TREE
12100 || storage_class
!= sc_static
);
12102 if (late_return_type_p
)
12103 TYPE_HAS_LATE_RETURN_TYPE (type
) = 1;
12105 decl
= grokfndecl (ctype
, type
, original_name
, parms
, unqualified_id
,
12106 reqs
, virtualp
, flags
, memfn_quals
, rqual
, raises
,
12109 inlinep
| (2 * constexpr_p
) | (4 * concept_p
),
12110 initialized
== SD_DELETED
,
12113 template_count
, in_namespace
, attrlist
,
12114 declarator
->id_loc
);
12115 if (decl
== NULL_TREE
)
12116 return error_mark_node
;
12120 int invalid_static
= 0;
12122 /* Don't allow a static member function in a class, and forbid
12123 declaring main to be static. */
12124 if (TREE_CODE (type
) == METHOD_TYPE
)
12126 permerror (input_location
, "cannot declare member function %qD to have "
12127 "static linkage", decl
);
12128 invalid_static
= 1;
12130 else if (current_function_decl
)
12132 /* 7.1.1: There can be no static function declarations within a
12134 error ("cannot declare static function inside another function");
12135 invalid_static
= 1;
12138 if (invalid_static
)
12141 storage_class
= sc_none
;
12147 /* It's a variable. */
12149 /* An uninitialized decl with `extern' is a reference. */
12150 decl
= grokvardecl (type
, dname
, unqualified_id
,
12157 ctype
? ctype
: in_namespace
);
12158 if (decl
== NULL_TREE
)
12159 return error_mark_node
;
12161 bad_specifiers (decl
, BSP_VAR
, virtualp
,
12162 memfn_quals
!= TYPE_UNQUALIFIED
,
12163 inlinep
, friendp
, raises
!= NULL_TREE
);
12167 DECL_CONTEXT (decl
) = ctype
;
12170 permerror (input_location
, "%<static%> may not be used when defining "
12171 "(as opposed to declaring) a static data member");
12173 storage_class
= sc_none
;
12175 if (storage_class
== sc_register
&& TREE_STATIC (decl
))
12177 error ("static member %qD declared %<register%>", decl
);
12178 storage_class
= sc_none
;
12180 if (storage_class
== sc_extern
&& pedantic
)
12182 pedwarn (input_location
, OPT_Wpedantic
,
12183 "cannot explicitly declare member %q#D to have "
12184 "extern linkage", decl
);
12185 storage_class
= sc_none
;
12188 else if (constexpr_p
&& DECL_EXTERNAL (decl
))
12190 error ("declaration of constexpr variable %qD is not a definition",
12192 constexpr_p
= false;
12196 mark_inline_variable (decl
);
12197 if (innermost_code
== cdk_decomp
)
12199 gcc_assert (declarator
&& declarator
->kind
== cdk_decomp
);
12200 DECL_SOURCE_LOCATION (decl
) = declarator
->id_loc
;
12201 retrofit_lang_decl (decl
);
12202 DECL_ARTIFICIAL (decl
) = 1;
12203 SET_DECL_DECOMPOSITION_P (decl
);
12207 if (VAR_P (decl
) && !initialized
)
12208 if (tree auto_node
= type_uses_auto (type
))
12210 location_t loc
= declspecs
->locations
[ds_type_spec
];
12211 if (tree tmpl
= CLASS_PLACEHOLDER_TEMPLATE (auto_node
))
12213 error_at (loc
, "invalid use of template-name %qE without an "
12214 "argument list", tmpl
);
12215 inform (loc
, "class template argument deduction "
12216 "requires an initializer");
12219 error_at (loc
, "declaration of %q#D has no initializer", decl
);
12220 TREE_TYPE (decl
) = error_mark_node
;
12223 if (storage_class
== sc_extern
&& initialized
&& !funcdef_flag
)
12225 if (toplevel_bindings_p ())
12227 /* It's common practice (and completely valid) to have a const
12228 be initialized and declared extern. */
12229 if (!(type_quals
& TYPE_QUAL_CONST
))
12230 warning (0, "%qs initialized and declared %<extern%>", name
);
12234 error ("%qs has both %<extern%> and initializer", name
);
12235 return error_mark_node
;
12239 /* Record `register' declaration for warnings on &
12240 and in case doing stupid register allocation. */
12242 if (storage_class
== sc_register
)
12244 DECL_REGISTER (decl
) = 1;
12245 /* Warn about register storage specifiers on PARM_DECLs. */
12246 if (TREE_CODE (decl
) == PARM_DECL
)
12248 if (cxx_dialect
>= cxx1z
)
12249 pedwarn (DECL_SOURCE_LOCATION (decl
), OPT_Wregister
,
12250 "ISO C++1z does not allow %<register%> storage "
12251 "class specifier");
12253 warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wregister
,
12254 "%<register%> storage class specifier used");
12257 else if (storage_class
== sc_extern
)
12258 DECL_THIS_EXTERN (decl
) = 1;
12259 else if (storage_class
== sc_static
)
12260 DECL_THIS_STATIC (decl
) = 1;
12262 /* Set constexpr flag on vars (functions got it in grokfndecl). */
12263 if (constexpr_p
&& VAR_P (decl
))
12264 DECL_DECLARED_CONSTEXPR_P (decl
) = true;
12266 /* Record constancy and volatility on the DECL itself . There's
12267 no need to do this when processing a template; we'll do this
12268 for the instantiated declaration based on the type of DECL. */
12269 if (!processing_template_decl
)
12270 cp_apply_type_quals_to_decl (type_quals
, decl
);
12276 /* Subroutine of start_function. Ensure that each of the parameter
12277 types (as listed in PARMS) is complete, as is required for a
12278 function definition. */
12281 require_complete_types_for_parms (tree parms
)
12283 for (; parms
; parms
= DECL_CHAIN (parms
))
12285 if (dependent_type_p (TREE_TYPE (parms
)))
12287 if (!VOID_TYPE_P (TREE_TYPE (parms
))
12288 && complete_type_or_else (TREE_TYPE (parms
), parms
))
12290 relayout_decl (parms
);
12291 DECL_ARG_TYPE (parms
) = type_passed_as (TREE_TYPE (parms
));
12294 /* grokparms or complete_type_or_else will have already issued
12296 TREE_TYPE (parms
) = error_mark_node
;
12300 /* Returns nonzero if T is a local variable. */
12303 local_variable_p (const_tree t
)
12306 /* A VAR_DECL with a context that is a _TYPE is a static data
12308 && !TYPE_P (CP_DECL_CONTEXT (t
))
12309 /* Any other non-local variable must be at namespace scope. */
12310 && !DECL_NAMESPACE_SCOPE_P (t
))
12311 || (TREE_CODE (t
) == PARM_DECL
))
12317 /* Like local_variable_p, but suitable for use as a tree-walking
12321 local_variable_p_walkfn (tree
*tp
, int *walk_subtrees
,
12324 if (local_variable_p (*tp
)
12325 && (!DECL_ARTIFICIAL (*tp
) || DECL_NAME (*tp
) == this_identifier
))
12327 else if (TYPE_P (*tp
))
12328 *walk_subtrees
= 0;
12333 /* Check that ARG, which is a default-argument expression for a
12334 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
12335 something goes wrong. DECL may also be a _TYPE node, rather than a
12336 DECL, if there is no DECL available. */
12339 check_default_argument (tree decl
, tree arg
, tsubst_flags_t complain
)
12344 if (TREE_CODE (arg
) == DEFAULT_ARG
)
12345 /* We get a DEFAULT_ARG when looking at an in-class declaration
12346 with a default argument. Ignore the argument for now; we'll
12347 deal with it after the class is complete. */
12356 decl_type
= TREE_TYPE (decl
);
12358 if (arg
== error_mark_node
12359 || decl
== error_mark_node
12360 || TREE_TYPE (arg
) == error_mark_node
12361 || decl_type
== error_mark_node
)
12362 /* Something already went wrong. There's no need to check
12364 return error_mark_node
;
12366 /* [dcl.fct.default]
12368 A default argument expression is implicitly converted to the
12370 ++cp_unevaluated_operand
;
12371 perform_implicit_conversion_flags (decl_type
, arg
, complain
,
12373 --cp_unevaluated_operand
;
12375 /* Avoid redundant -Wzero-as-null-pointer-constant warnings at
12377 if (TYPE_PTR_OR_PTRMEM_P (decl_type
)
12378 && null_ptr_cst_p (arg
))
12379 return nullptr_node
;
12381 /* [dcl.fct.default]
12383 Local variables shall not be used in default argument
12386 The keyword `this' shall not be used in a default argument of a
12387 member function. */
12388 var
= cp_walk_tree_without_duplicates (&arg
, local_variable_p_walkfn
, NULL
);
12391 if (complain
& tf_warning_or_error
)
12393 if (DECL_NAME (var
) == this_identifier
)
12394 permerror (input_location
, "default argument %qE uses %qD",
12397 error ("default argument %qE uses local variable %qD", arg
, var
);
12399 return error_mark_node
;
12406 /* Returns a deprecated type used within TYPE, or NULL_TREE if none. */
12409 type_is_deprecated (tree type
)
12411 enum tree_code code
;
12412 if (TREE_DEPRECATED (type
))
12414 if (TYPE_NAME (type
))
12416 if (TREE_DEPRECATED (TYPE_NAME (type
)))
12422 /* Do warn about using typedefs to a deprecated class. */
12423 if (OVERLOAD_TYPE_P (type
) && type
!= TYPE_MAIN_VARIANT (type
))
12424 return type_is_deprecated (TYPE_MAIN_VARIANT (type
));
12426 code
= TREE_CODE (type
);
12428 if (code
== POINTER_TYPE
|| code
== REFERENCE_TYPE
12429 || code
== OFFSET_TYPE
|| code
== FUNCTION_TYPE
12430 || code
== METHOD_TYPE
|| code
== ARRAY_TYPE
)
12431 return type_is_deprecated (TREE_TYPE (type
));
12433 if (TYPE_PTRMEMFUNC_P (type
))
12434 return type_is_deprecated
12435 (TREE_TYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (type
))));
12440 /* Decode the list of parameter types for a function type.
12441 Given the list of things declared inside the parens,
12442 return a list of types.
12444 If this parameter does not end with an ellipsis, we append
12447 *PARMS is set to the chain of PARM_DECLs created. */
12450 grokparms (tree parmlist
, tree
*parms
)
12452 tree result
= NULL_TREE
;
12453 tree decls
= NULL_TREE
;
12457 for (parm
= parmlist
; parm
!= NULL_TREE
; parm
= TREE_CHAIN (parm
))
12459 tree type
= NULL_TREE
;
12460 tree init
= TREE_PURPOSE (parm
);
12461 tree decl
= TREE_VALUE (parm
);
12463 if (parm
== void_list_node
)
12466 if (! decl
|| TREE_TYPE (decl
) == error_mark_node
)
12469 type
= TREE_TYPE (decl
);
12470 if (VOID_TYPE_P (type
))
12472 if (same_type_p (type
, void_type_node
)
12474 && !DECL_NAME (decl
) && !result
12475 && TREE_CHAIN (parm
) == void_list_node
)
12476 /* DR 577: A parameter list consisting of a single
12477 unnamed parameter of non-dependent type 'void'. */
12479 else if (cv_qualified_p (type
))
12480 error_at (DECL_SOURCE_LOCATION (decl
),
12481 "invalid use of cv-qualified type %qT in "
12482 "parameter declaration", type
);
12484 error_at (DECL_SOURCE_LOCATION (decl
),
12485 "invalid use of type %<void%> in parameter "
12487 /* It's not a good idea to actually create parameters of
12488 type `void'; other parts of the compiler assume that a
12489 void type terminates the parameter list. */
12490 type
= error_mark_node
;
12491 TREE_TYPE (decl
) = error_mark_node
;
12494 if (type
!= error_mark_node
)
12496 if (deprecated_state
!= DEPRECATED_SUPPRESS
)
12498 tree deptype
= type_is_deprecated (type
);
12500 warn_deprecated_use (deptype
, NULL_TREE
);
12503 /* Top-level qualifiers on the parameters are
12504 ignored for function types. */
12505 type
= cp_build_qualified_type (type
, 0);
12506 if (TREE_CODE (type
) == METHOD_TYPE
)
12508 error ("parameter %qD invalidly declared method type", decl
);
12509 type
= build_pointer_type (type
);
12510 TREE_TYPE (decl
) = type
;
12512 else if (abstract_virtuals_error (decl
, type
))
12513 any_error
= 1; /* Seems like a good idea. */
12514 else if (POINTER_TYPE_P (type
))
12516 /* [dcl.fct]/6, parameter types cannot contain pointers
12517 (references) to arrays of unknown bound. */
12518 tree t
= TREE_TYPE (type
);
12519 int ptr
= TYPE_PTR_P (type
);
12523 if (TYPE_PTR_P (t
))
12525 else if (TREE_CODE (t
) != ARRAY_TYPE
)
12527 else if (!TYPE_DOMAIN (t
))
12531 if (TREE_CODE (t
) == ARRAY_TYPE
)
12533 ? G_("parameter %qD includes pointer to array of "
12534 "unknown bound %qT")
12535 : G_("parameter %qD includes reference to array of "
12536 "unknown bound %qT"),
12542 else if (init
&& !processing_template_decl
)
12543 init
= check_default_argument (decl
, init
, tf_warning_or_error
);
12546 DECL_CHAIN (decl
) = decls
;
12548 result
= tree_cons (init
, type
, result
);
12550 decls
= nreverse (decls
);
12551 result
= nreverse (result
);
12553 result
= chainon (result
, void_list_node
);
12560 /* D is a constructor or overloaded `operator='.
12562 Let T be the class in which D is declared. Then, this function
12565 -1 if D's is an ill-formed constructor or copy assignment operator
12566 whose first parameter is of type `T'.
12567 0 if D is not a copy constructor or copy assignment
12569 1 if D is a copy constructor or copy assignment operator whose
12570 first parameter is a reference to non-const qualified T.
12571 2 if D is a copy constructor or copy assignment operator whose
12572 first parameter is a reference to const qualified T.
12574 This function can be used as a predicate. Positive values indicate
12575 a copy constructor and nonzero values indicate a copy assignment
12579 copy_fn_p (const_tree d
)
12585 gcc_assert (DECL_FUNCTION_MEMBER_P (d
));
12587 if (TREE_CODE (d
) == TEMPLATE_DECL
12588 || (DECL_TEMPLATE_INFO (d
)
12589 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d
))))
12590 /* Instantiations of template member functions are never copy
12591 functions. Note that member functions of templated classes are
12592 represented as template functions internally, and we must
12593 accept those as copy functions. */
12596 args
= FUNCTION_FIRST_USER_PARMTYPE (d
);
12600 arg_type
= TREE_VALUE (args
);
12601 if (arg_type
== error_mark_node
)
12604 if (TYPE_MAIN_VARIANT (arg_type
) == DECL_CONTEXT (d
))
12606 /* Pass by value copy assignment operator. */
12609 else if (TREE_CODE (arg_type
) == REFERENCE_TYPE
12610 && !TYPE_REF_IS_RVALUE (arg_type
)
12611 && TYPE_MAIN_VARIANT (TREE_TYPE (arg_type
)) == DECL_CONTEXT (d
))
12613 if (CP_TYPE_CONST_P (TREE_TYPE (arg_type
)))
12619 args
= TREE_CHAIN (args
);
12621 if (args
&& args
!= void_list_node
&& !TREE_PURPOSE (args
))
12622 /* There are more non-optional args. */
12628 /* D is a constructor or overloaded `operator='.
12630 Let T be the class in which D is declared. Then, this function
12631 returns true when D is a move constructor or move assignment
12632 operator, false otherwise. */
12635 move_fn_p (const_tree d
)
12637 gcc_assert (DECL_FUNCTION_MEMBER_P (d
));
12639 if (cxx_dialect
== cxx98
)
12640 /* There are no move constructors if we are in C++98 mode. */
12643 if (TREE_CODE (d
) == TEMPLATE_DECL
12644 || (DECL_TEMPLATE_INFO (d
)
12645 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d
))))
12646 /* Instantiations of template member functions are never move
12647 functions. Note that member functions of templated classes are
12648 represented as template functions internally, and we must
12649 accept those as move functions. */
12652 return move_signature_fn_p (d
);
12655 /* D is a constructor or overloaded `operator='.
12657 Then, this function returns true when D has the same signature as a move
12658 constructor or move assignment operator (because either it is such a
12659 ctor/op= or it is a template specialization with the same signature),
12660 false otherwise. */
12663 move_signature_fn_p (const_tree d
)
12667 bool result
= false;
12669 args
= FUNCTION_FIRST_USER_PARMTYPE (d
);
12673 arg_type
= TREE_VALUE (args
);
12674 if (arg_type
== error_mark_node
)
12677 if (TREE_CODE (arg_type
) == REFERENCE_TYPE
12678 && TYPE_REF_IS_RVALUE (arg_type
)
12679 && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (arg_type
)),
12683 args
= TREE_CHAIN (args
);
12685 if (args
&& args
!= void_list_node
&& !TREE_PURPOSE (args
))
12686 /* There are more non-optional args. */
12692 /* Remember any special properties of member function DECL. */
12695 grok_special_member_properties (tree decl
)
12699 if (!DECL_NONSTATIC_MEMBER_FUNCTION_P (decl
))
12702 class_type
= DECL_CONTEXT (decl
);
12703 if (DECL_CONSTRUCTOR_P (decl
))
12705 int ctor
= copy_fn_p (decl
);
12707 if (!DECL_ARTIFICIAL (decl
))
12708 TYPE_HAS_USER_CONSTRUCTOR (class_type
) = 1;
12714 A non-template constructor for class X is a copy
12715 constructor if its first parameter is of type X&, const
12716 X&, volatile X& or const volatile X&, and either there
12717 are no other parameters or else all other parameters have
12718 default arguments. */
12719 TYPE_HAS_COPY_CTOR (class_type
) = 1;
12720 if (user_provided_p (decl
))
12721 TYPE_HAS_COMPLEX_COPY_CTOR (class_type
) = 1;
12723 TYPE_HAS_CONST_COPY_CTOR (class_type
) = 1;
12725 else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl
)))
12726 TYPE_HAS_DEFAULT_CONSTRUCTOR (class_type
) = 1;
12727 else if (move_fn_p (decl
) && user_provided_p (decl
))
12728 TYPE_HAS_COMPLEX_MOVE_CTOR (class_type
) = 1;
12729 else if (is_list_ctor (decl
))
12730 TYPE_HAS_LIST_CTOR (class_type
) = 1;
12732 if (DECL_DECLARED_CONSTEXPR_P (decl
)
12733 && !copy_fn_p (decl
) && !move_fn_p (decl
))
12734 TYPE_HAS_CONSTEXPR_CTOR (class_type
) = 1;
12736 else if (DECL_OVERLOADED_OPERATOR_P (decl
) == NOP_EXPR
)
12740 A non-template assignment operator for class X is a copy
12741 assignment operator if its parameter is of type X, X&, const
12742 X&, volatile X& or const volatile X&. */
12744 int assop
= copy_fn_p (decl
);
12748 TYPE_HAS_COPY_ASSIGN (class_type
) = 1;
12749 if (user_provided_p (decl
))
12750 TYPE_HAS_COMPLEX_COPY_ASSIGN (class_type
) = 1;
12752 TYPE_HAS_CONST_COPY_ASSIGN (class_type
) = 1;
12754 else if (move_fn_p (decl
) && user_provided_p (decl
))
12755 TYPE_HAS_COMPLEX_MOVE_ASSIGN (class_type
) = 1;
12757 /* Destructors are handled in check_methods. */
12760 /* Check a constructor DECL has the correct form. Complains
12761 if the class has a constructor of the form X(X). */
12764 grok_ctor_properties (const_tree ctype
, const_tree decl
)
12766 int ctor_parm
= copy_fn_p (decl
);
12772 A declaration of a constructor for a class X is ill-formed if
12773 its first parameter is of type (optionally cv-qualified) X
12774 and either there are no other parameters or else all other
12775 parameters have default arguments.
12777 We *don't* complain about member template instantiations that
12778 have this form, though; they can occur as we try to decide
12779 what constructor to use during overload resolution. Since
12780 overload resolution will never prefer such a constructor to
12781 the non-template copy constructor (which is either explicitly
12782 or implicitly defined), there's no need to worry about their
12783 existence. Theoretically, they should never even be
12784 instantiated, but that's hard to forestall. */
12785 error ("invalid constructor; you probably meant %<%T (const %T&)%>",
12793 /* An operator with this code is unary, but can also be binary. */
12796 ambi_op_p (enum tree_code code
)
12798 return (code
== INDIRECT_REF
12799 || code
== ADDR_EXPR
12800 || code
== UNARY_PLUS_EXPR
12801 || code
== NEGATE_EXPR
12802 || code
== PREINCREMENT_EXPR
12803 || code
== PREDECREMENT_EXPR
);
12806 /* An operator with this name can only be unary. */
12809 unary_op_p (enum tree_code code
)
12811 return (code
== TRUTH_NOT_EXPR
12812 || code
== BIT_NOT_EXPR
12813 || code
== COMPONENT_REF
12814 || code
== TYPE_EXPR
);
12817 /* DECL is a declaration for an overloaded operator. If COMPLAIN is true,
12818 errors are issued for invalid declarations. */
12821 grok_op_properties (tree decl
, bool complain
)
12823 tree argtypes
= TYPE_ARG_TYPES (TREE_TYPE (decl
));
12825 int methodp
= (TREE_CODE (TREE_TYPE (decl
)) == METHOD_TYPE
);
12826 tree name
= DECL_NAME (decl
);
12827 enum tree_code operator_code
;
12832 /* Count the number of arguments and check for ellipsis. */
12833 for (argtype
= argtypes
, arity
= 0;
12834 argtype
&& argtype
!= void_list_node
;
12835 argtype
= TREE_CHAIN (argtype
))
12837 ellipsis_p
= !argtype
;
12839 class_type
= DECL_CONTEXT (decl
);
12840 if (class_type
&& !CLASS_TYPE_P (class_type
))
12841 class_type
= NULL_TREE
;
12843 if (DECL_CONV_FN_P (decl
))
12844 operator_code
= TYPE_EXPR
;
12848 #define DEF_OPERATOR(NAME, CODE, MANGLING, ARITY, ASSN_P) \
12849 if (ansi_opname (CODE) == name) \
12851 operator_code = (CODE); \
12854 else if (ansi_assopname (CODE) == name) \
12856 operator_code = (CODE); \
12857 DECL_ASSIGNMENT_OPERATOR_P (decl) = 1; \
12861 #include "operators.def"
12862 #undef DEF_OPERATOR
12864 gcc_unreachable ();
12867 gcc_assert (operator_code
!= MAX_TREE_CODES
);
12868 SET_OVERLOADED_OPERATOR_CODE (decl
, operator_code
);
12871 switch (operator_code
)
12874 TYPE_HAS_NEW_OPERATOR (class_type
) = 1;
12878 TYPE_GETS_DELETE (class_type
) |= 1;
12882 TYPE_HAS_ARRAY_NEW_OPERATOR (class_type
) = 1;
12885 case VEC_DELETE_EXPR
:
12886 TYPE_GETS_DELETE (class_type
) |= 2;
12893 /* [basic.std.dynamic.allocation]/1:
12895 A program is ill-formed if an allocation function is declared
12896 in a namespace scope other than global scope or declared static
12899 The same also holds true for deallocation functions. */
12900 if (operator_code
== NEW_EXPR
|| operator_code
== VEC_NEW_EXPR
12901 || operator_code
== DELETE_EXPR
|| operator_code
== VEC_DELETE_EXPR
)
12903 if (DECL_NAMESPACE_SCOPE_P (decl
))
12905 if (CP_DECL_CONTEXT (decl
) != global_namespace
)
12907 error ("%qD may not be declared within a namespace", decl
);
12910 else if (!TREE_PUBLIC (decl
))
12912 error ("%qD may not be declared as static", decl
);
12918 if (operator_code
== NEW_EXPR
|| operator_code
== VEC_NEW_EXPR
)
12920 TREE_TYPE (decl
) = coerce_new_type (TREE_TYPE (decl
));
12921 DECL_IS_OPERATOR_NEW (decl
) = 1;
12923 else if (operator_code
== DELETE_EXPR
|| operator_code
== VEC_DELETE_EXPR
)
12924 TREE_TYPE (decl
) = coerce_delete_type (TREE_TYPE (decl
));
12927 /* An operator function must either be a non-static member function
12928 or have at least one parameter of a class, a reference to a class,
12929 an enumeration, or a reference to an enumeration. 13.4.0.6 */
12930 if (! methodp
|| DECL_STATIC_FUNCTION_P (decl
))
12932 if (operator_code
== TYPE_EXPR
12933 || operator_code
== CALL_EXPR
12934 || operator_code
== COMPONENT_REF
12935 || operator_code
== ARRAY_REF
12936 || operator_code
== NOP_EXPR
)
12938 error ("%qD must be a nonstatic member function", decl
);
12945 if (DECL_STATIC_FUNCTION_P (decl
))
12947 error ("%qD must be either a non-static member "
12948 "function or a non-member function", decl
);
12952 for (p
= argtypes
; p
&& p
!= void_list_node
; p
= TREE_CHAIN (p
))
12954 tree arg
= non_reference (TREE_VALUE (p
));
12955 if (arg
== error_mark_node
)
12958 /* MAYBE_CLASS_TYPE_P, rather than CLASS_TYPE_P, is used
12959 because these checks are performed even on
12960 template functions. */
12961 if (MAYBE_CLASS_TYPE_P (arg
)
12962 || TREE_CODE (arg
) == ENUMERAL_TYPE
)
12966 if (!p
|| p
== void_list_node
)
12969 error ("%qD must have an argument of class or "
12970 "enumerated type", decl
);
12976 /* There are no restrictions on the arguments to an overloaded
12978 if (operator_code
== CALL_EXPR
)
12981 /* Warn about conversion operators that will never be used. */
12982 if (IDENTIFIER_TYPENAME_P (name
)
12983 && ! DECL_TEMPLATE_INFO (decl
)
12985 /* Warn only declaring the function; there is no need to
12986 warn again about out-of-class definitions. */
12987 && class_type
== current_class_type
)
12989 tree t
= TREE_TYPE (name
);
12990 int ref
= (TREE_CODE (t
) == REFERENCE_TYPE
);
12993 t
= TYPE_MAIN_VARIANT (TREE_TYPE (t
));
12995 if (VOID_TYPE_P (t
))
12996 warning (OPT_Wconversion
,
12998 ? G_("conversion to a reference to void "
12999 "will never use a type conversion operator")
13000 : G_("conversion to void "
13001 "will never use a type conversion operator"));
13002 else if (class_type
)
13004 if (t
== class_type
)
13005 warning (OPT_Wconversion
,
13007 ? G_("conversion to a reference to the same type "
13008 "will never use a type conversion operator")
13009 : G_("conversion to the same type "
13010 "will never use a type conversion operator"));
13011 /* Don't force t to be complete here. */
13012 else if (MAYBE_CLASS_TYPE_P (t
)
13013 && COMPLETE_TYPE_P (t
)
13014 && DERIVED_FROM_P (t
, class_type
))
13015 warning (OPT_Wconversion
,
13017 ? G_("conversion to a reference to a base class "
13018 "will never use a type conversion operator")
13019 : G_("conversion to a base class "
13020 "will never use a type conversion operator"));
13025 if (operator_code
== COND_EXPR
)
13028 error ("ISO C++ prohibits overloading operator ?:");
13031 else if (ellipsis_p
)
13033 error ("%qD must not have variable number of arguments", decl
);
13036 else if (ambi_op_p (operator_code
))
13039 /* We pick the one-argument operator codes by default, so
13040 we don't have to change anything. */
13042 else if (arity
== 2)
13044 /* If we thought this was a unary operator, we now know
13045 it to be a binary operator. */
13046 switch (operator_code
)
13049 operator_code
= MULT_EXPR
;
13053 operator_code
= BIT_AND_EXPR
;
13056 case UNARY_PLUS_EXPR
:
13057 operator_code
= PLUS_EXPR
;
13061 operator_code
= MINUS_EXPR
;
13064 case PREINCREMENT_EXPR
:
13065 operator_code
= POSTINCREMENT_EXPR
;
13068 case PREDECREMENT_EXPR
:
13069 operator_code
= POSTDECREMENT_EXPR
;
13073 gcc_unreachable ();
13076 SET_OVERLOADED_OPERATOR_CODE (decl
, operator_code
);
13078 if ((operator_code
== POSTINCREMENT_EXPR
13079 || operator_code
== POSTDECREMENT_EXPR
)
13080 && ! processing_template_decl
13081 && ! same_type_p (TREE_VALUE (TREE_CHAIN (argtypes
)), integer_type_node
))
13084 error ("postfix %qD must take %<int%> as its argument",
13087 error ("postfix %qD must take %<int%> as its second "
13095 error ("%qD must take either zero or one argument", decl
);
13097 error ("%qD must take either one or two arguments", decl
);
13101 /* More Effective C++ rule 6. */
13103 && (operator_code
== POSTINCREMENT_EXPR
13104 || operator_code
== POSTDECREMENT_EXPR
13105 || operator_code
== PREINCREMENT_EXPR
13106 || operator_code
== PREDECREMENT_EXPR
))
13108 tree arg
= TREE_VALUE (argtypes
);
13109 tree ret
= TREE_TYPE (TREE_TYPE (decl
));
13110 if (methodp
|| TREE_CODE (arg
) == REFERENCE_TYPE
)
13111 arg
= TREE_TYPE (arg
);
13112 arg
= TYPE_MAIN_VARIANT (arg
);
13113 if (operator_code
== PREINCREMENT_EXPR
13114 || operator_code
== PREDECREMENT_EXPR
)
13116 if (TREE_CODE (ret
) != REFERENCE_TYPE
13117 || !same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (ret
)),
13119 warning (OPT_Weffc__
, "prefix %qD should return %qT", decl
,
13120 build_reference_type (arg
));
13124 if (!same_type_p (TYPE_MAIN_VARIANT (ret
), arg
))
13125 warning (OPT_Weffc__
, "postfix %qD should return %qT", decl
, arg
);
13129 else if (unary_op_p (operator_code
))
13134 error ("%qD must take %<void%>", decl
);
13136 error ("%qD must take exactly one argument", decl
);
13140 else /* if (binary_op_p (operator_code)) */
13145 error ("%qD must take exactly one argument", decl
);
13147 error ("%qD must take exactly two arguments", decl
);
13151 /* More Effective C++ rule 7. */
13153 && (operator_code
== TRUTH_ANDIF_EXPR
13154 || operator_code
== TRUTH_ORIF_EXPR
13155 || operator_code
== COMPOUND_EXPR
))
13156 warning (OPT_Weffc__
, "user-defined %qD always evaluates both arguments",
13160 /* Effective C++ rule 23. */
13163 && !DECL_ASSIGNMENT_OPERATOR_P (decl
)
13164 && (operator_code
== PLUS_EXPR
13165 || operator_code
== MINUS_EXPR
13166 || operator_code
== TRUNC_DIV_EXPR
13167 || operator_code
== MULT_EXPR
13168 || operator_code
== TRUNC_MOD_EXPR
)
13169 && TREE_CODE (TREE_TYPE (TREE_TYPE (decl
))) == REFERENCE_TYPE
)
13170 warning (OPT_Weffc__
, "%qD should return by value", decl
);
13172 /* [over.oper]/8 */
13173 for (; argtypes
&& argtypes
!= void_list_node
;
13174 argtypes
= TREE_CHAIN (argtypes
))
13175 if (TREE_PURPOSE (argtypes
))
13177 TREE_PURPOSE (argtypes
) = NULL_TREE
;
13178 if (operator_code
== POSTINCREMENT_EXPR
13179 || operator_code
== POSTDECREMENT_EXPR
)
13181 pedwarn (input_location
, OPT_Wpedantic
, "%qD cannot have default arguments",
13186 error ("%qD cannot have default arguments", decl
);
13194 /* Return a string giving the keyword associate with CODE. */
13196 static const char *
13197 tag_name (enum tag_types code
)
13209 case typename_type
:
13212 gcc_unreachable ();
13216 /* Name lookup in an elaborated-type-specifier (after the keyword
13217 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
13218 elaborated-type-specifier is invalid, issue a diagnostic and return
13219 error_mark_node; otherwise, return the *_TYPE to which it referred.
13220 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
13223 check_elaborated_type_specifier (enum tag_types tag_code
,
13225 bool allow_template_p
)
13231 struct S { struct S *p; };
13233 name lookup will find the TYPE_DECL for the implicit "S::S"
13234 typedef. Adjust for that here. */
13235 if (DECL_SELF_REFERENCE_P (decl
))
13236 decl
= TYPE_NAME (TREE_TYPE (decl
));
13238 type
= TREE_TYPE (decl
);
13240 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
13241 is false for this case as well. */
13242 if (TREE_CODE (type
) == TEMPLATE_TYPE_PARM
)
13244 error ("using template type parameter %qT after %qs",
13245 type
, tag_name (tag_code
));
13246 return error_mark_node
;
13248 /* Accept template template parameters. */
13249 else if (allow_template_p
13250 && (TREE_CODE (type
) == BOUND_TEMPLATE_TEMPLATE_PARM
13251 || TREE_CODE (type
) == TEMPLATE_TEMPLATE_PARM
))
13255 If the identifier resolves to a typedef-name or the
13256 simple-template-id resolves to an alias template
13257 specialization, the elaborated-type-specifier is ill-formed.
13259 In other words, the only legitimate declaration to use in the
13260 elaborated type specifier is the implicit typedef created when
13261 the type is declared. */
13262 else if (!DECL_IMPLICIT_TYPEDEF_P (decl
)
13263 && !DECL_SELF_REFERENCE_P (decl
)
13264 && tag_code
!= typename_type
)
13266 if (alias_template_specialization_p (type
))
13267 error ("using alias template specialization %qT after %qs",
13268 type
, tag_name (tag_code
));
13270 error ("using typedef-name %qD after %qs", decl
, tag_name (tag_code
));
13271 inform (DECL_SOURCE_LOCATION (decl
),
13272 "%qD has a previous declaration here", decl
);
13273 return error_mark_node
;
13275 else if (TREE_CODE (type
) != RECORD_TYPE
13276 && TREE_CODE (type
) != UNION_TYPE
13277 && tag_code
!= enum_type
13278 && tag_code
!= typename_type
)
13280 error ("%qT referred to as %qs", type
, tag_name (tag_code
));
13281 inform (location_of (type
), "%qT has a previous declaration here", type
);
13282 return error_mark_node
;
13284 else if (TREE_CODE (type
) != ENUMERAL_TYPE
13285 && tag_code
== enum_type
)
13287 error ("%qT referred to as enum", type
);
13288 inform (location_of (type
), "%qT has a previous declaration here", type
);
13289 return error_mark_node
;
13291 else if (!allow_template_p
13292 && TREE_CODE (type
) == RECORD_TYPE
13293 && CLASSTYPE_IS_TEMPLATE (type
))
13295 /* If a class template appears as elaborated type specifier
13296 without a template header such as:
13298 template <class T> class C {};
13299 void f(class C); // No template header here
13301 then the required template argument is missing. */
13302 error ("template argument required for %<%s %T%>",
13303 tag_name (tag_code
),
13304 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type
)));
13305 return error_mark_node
;
13311 /* Lookup NAME in elaborate type specifier in scope according to
13312 SCOPE and issue diagnostics if necessary.
13313 Return *_TYPE node upon success, NULL_TREE when the NAME is not
13314 found, and ERROR_MARK_NODE for type error. */
13317 lookup_and_check_tag (enum tag_types tag_code
, tree name
,
13318 tag_scope scope
, bool template_header_p
)
13322 if (scope
== ts_global
)
13324 /* First try ordinary name lookup, ignoring hidden class name
13325 injected via friend declaration. */
13326 decl
= lookup_name_prefer_type (name
, 2);
13327 decl
= strip_using_decl (decl
);
13328 /* If that fails, the name will be placed in the smallest
13329 non-class, non-function-prototype scope according to 3.3.1/5.
13330 We may already have a hidden name declared as friend in this
13331 scope. So lookup again but not ignoring hidden names.
13332 If we find one, that name will be made visible rather than
13333 creating a new tag. */
13335 decl
= lookup_type_scope (name
, ts_within_enclosing_non_class
);
13338 decl
= lookup_type_scope (name
, scope
);
13341 && (DECL_CLASS_TEMPLATE_P (decl
)
13342 /* If scope is ts_current we're defining a class, so ignore a
13343 template template parameter. */
13344 || (scope
!= ts_current
13345 && DECL_TEMPLATE_TEMPLATE_PARM_P (decl
))))
13346 decl
= DECL_TEMPLATE_RESULT (decl
);
13348 if (decl
&& TREE_CODE (decl
) == TYPE_DECL
)
13350 /* Look for invalid nested type:
13354 if (scope
== ts_current
&& DECL_SELF_REFERENCE_P (decl
))
13356 error ("%qD has the same name as the class in which it is "
13359 return error_mark_node
;
13362 /* Two cases we need to consider when deciding if a class
13363 template is allowed as an elaborated type specifier:
13364 1. It is a self reference to its own class.
13365 2. It comes with a template header.
13369 template <class T> class C {
13370 class C *c1; // DECL_SELF_REFERENCE_P is true
13373 template <class U> class C; // template_header_p is true
13374 template <class T> class C<T>::D {
13375 class C *c2; // DECL_SELF_REFERENCE_P is true
13378 t
= check_elaborated_type_specifier (tag_code
,
13381 | DECL_SELF_REFERENCE_P (decl
));
13382 if (template_header_p
&& t
&& CLASS_TYPE_P (t
)
13383 && (!CLASSTYPE_TEMPLATE_INFO (t
)
13384 || (!PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (t
)))))
13386 error ("%qT is not a template", t
);
13387 inform (location_of (t
), "previous declaration here");
13388 if (TYPE_CLASS_SCOPE_P (t
)
13389 && CLASSTYPE_TEMPLATE_INFO (TYPE_CONTEXT (t
)))
13390 inform (input_location
,
13391 "perhaps you want to explicitly add %<%T::%>",
13393 t
= error_mark_node
;
13398 else if (decl
&& TREE_CODE (decl
) == TREE_LIST
)
13400 error ("reference to %qD is ambiguous", name
);
13401 print_candidates (decl
);
13402 return error_mark_node
;
13408 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
13409 Define the tag as a forward-reference if it is not defined.
13411 If a declaration is given, process it here, and report an error if
13412 multiple declarations are not identical.
13414 SCOPE is TS_CURRENT when this is also a definition. Only look in
13415 the current frame for the name (since C++ allows new names in any
13416 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
13417 declaration. Only look beginning from the current scope outward up
13418 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
13420 TEMPLATE_HEADER_P is true when this declaration is preceded by
13421 a set of template parameters. */
13424 xref_tag_1 (enum tag_types tag_code
, tree name
,
13425 tag_scope orig_scope
, bool template_header_p
)
13427 enum tree_code code
;
13429 tree context
= NULL_TREE
;
13432 gcc_assert (identifier_p (name
));
13438 code
= RECORD_TYPE
;
13444 code
= ENUMERAL_TYPE
;
13447 gcc_unreachable ();
13450 if (orig_scope
== ts_lambda
)
13451 scope
= ts_current
;
13453 scope
= orig_scope
;
13455 /* In case of anonymous name, xref_tag is only called to
13456 make type node and push name. Name lookup is not required. */
13457 if (anon_aggrname_p (name
))
13460 t
= lookup_and_check_tag (tag_code
, name
,
13461 scope
, template_header_p
);
13463 if (t
== error_mark_node
)
13464 return error_mark_node
;
13466 if (scope
!= ts_current
&& t
&& current_class_type
13467 && template_class_depth (current_class_type
)
13468 && template_header_p
)
13470 if (TREE_CODE (t
) == TEMPLATE_TEMPLATE_PARM
)
13473 /* Since SCOPE is not TS_CURRENT, we are not looking at a
13474 definition of this tag. Since, in addition, we are currently
13475 processing a (member) template declaration of a template
13476 class, we must be very careful; consider:
13483 { template <class V>
13484 friend struct S1; };
13486 Here, the S2::S1 declaration should not be confused with the
13487 outer declaration. In particular, the inner version should
13488 have a template parameter of level 2, not level 1. This
13489 would be particularly important if the member declaration
13492 template <class V = U> friend struct S1;
13494 say, when we should tsubst into `U' when instantiating
13495 S2. On the other hand, when presented with:
13505 we must find the inner binding eventually. We
13506 accomplish this by making sure that the new type we
13507 create to represent this declaration has the right
13509 context
= TYPE_CONTEXT (t
);
13515 /* If no such tag is yet defined, create a forward-reference node
13516 and record it as the "definition".
13517 When a real declaration of this type is found,
13518 the forward-reference will be altered into a real type. */
13519 if (code
== ENUMERAL_TYPE
)
13521 error ("use of enum %q#D without previous declaration", name
);
13522 return error_mark_node
;
13526 t
= make_class_type (code
);
13527 TYPE_CONTEXT (t
) = context
;
13528 if (orig_scope
== ts_lambda
)
13529 /* Remember that we're declaring a lambda to avoid bogus errors
13530 in push_template_decl. */
13531 CLASSTYPE_LAMBDA_EXPR (t
) = error_mark_node
;
13532 t
= pushtag (name
, t
, scope
);
13537 if (template_header_p
&& MAYBE_CLASS_TYPE_P (t
))
13539 /* Check that we aren't trying to overload a class with different
13541 tree constr
= NULL_TREE
;
13542 if (current_template_parms
)
13544 tree reqs
= TEMPLATE_PARMS_CONSTRAINTS (current_template_parms
);
13545 constr
= build_constraints (reqs
, NULL_TREE
);
13547 if (!redeclare_class_template (t
, current_template_parms
, constr
))
13548 return error_mark_node
;
13550 else if (!processing_template_decl
13551 && CLASS_TYPE_P (t
)
13552 && CLASSTYPE_IS_TEMPLATE (t
))
13554 error ("redeclaration of %qT as a non-template", t
);
13555 inform (location_of (t
), "previous declaration %qD", t
);
13556 return error_mark_node
;
13559 /* Make injected friend class visible. */
13560 if (scope
!= ts_within_enclosing_non_class
13561 && hidden_name_p (TYPE_NAME (t
)))
13563 DECL_ANTICIPATED (TYPE_NAME (t
)) = 0;
13564 DECL_FRIEND_P (TYPE_NAME (t
)) = 0;
13566 if (TYPE_TEMPLATE_INFO (t
))
13568 DECL_ANTICIPATED (TYPE_TI_TEMPLATE (t
)) = 0;
13569 DECL_FRIEND_P (TYPE_TI_TEMPLATE (t
)) = 0;
13577 /* Wrapper for xref_tag_1. */
13580 xref_tag (enum tag_types tag_code
, tree name
,
13581 tag_scope scope
, bool template_header_p
)
13585 subtime
= timevar_cond_start (TV_NAME_LOOKUP
);
13586 ret
= xref_tag_1 (tag_code
, name
, scope
, template_header_p
);
13587 timevar_cond_stop (TV_NAME_LOOKUP
, subtime
);
13593 xref_tag_from_type (tree old
, tree id
, tag_scope scope
)
13595 enum tag_types tag_kind
;
13597 if (TREE_CODE (old
) == RECORD_TYPE
)
13598 tag_kind
= (CLASSTYPE_DECLARED_CLASS (old
) ? class_type
: record_type
);
13600 tag_kind
= union_type
;
13602 if (id
== NULL_TREE
)
13603 id
= TYPE_IDENTIFIER (old
);
13605 return xref_tag (tag_kind
, id
, scope
, false);
13608 /* Create the binfo hierarchy for REF with (possibly NULL) base list
13609 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
13610 access_* node, and the TREE_VALUE is the type of the base-class.
13611 Non-NULL TREE_TYPE indicates virtual inheritance. */
13614 xref_basetypes (tree ref
, tree base_list
)
13617 tree binfo
, base_binfo
;
13618 unsigned max_vbases
= 0; /* Maximum direct & indirect virtual bases. */
13619 unsigned max_bases
= 0; /* Maximum direct bases. */
13620 unsigned max_dvbases
= 0; /* Maximum direct virtual bases. */
13622 tree default_access
;
13623 tree igo_prev
; /* Track Inheritance Graph Order. */
13625 if (ref
== error_mark_node
)
13628 /* The base of a derived class is private by default, all others are
13630 default_access
= (TREE_CODE (ref
) == RECORD_TYPE
13631 && CLASSTYPE_DECLARED_CLASS (ref
)
13632 ? access_private_node
: access_public_node
);
13634 /* First, make sure that any templates in base-classes are
13635 instantiated. This ensures that if we call ourselves recursively
13636 we do not get confused about which classes are marked and which
13638 basep
= &base_list
;
13641 tree basetype
= TREE_VALUE (*basep
);
13643 /* The dependent_type_p call below should really be dependent_scope_p
13644 so that we give a hard error about using an incomplete type as a
13645 base, but we allow it with a pedwarn for backward
13647 if (processing_template_decl
13648 && CLASS_TYPE_P (basetype
) && TYPE_BEING_DEFINED (basetype
))
13649 cxx_incomplete_type_diagnostic (NULL_TREE
, basetype
, DK_PEDWARN
);
13650 if (!dependent_type_p (basetype
)
13651 && !complete_type_or_else (basetype
, NULL
))
13652 /* An incomplete type. Remove it from the list. */
13653 *basep
= TREE_CHAIN (*basep
);
13657 if (TREE_TYPE (*basep
))
13659 if (CLASS_TYPE_P (basetype
))
13660 max_vbases
+= vec_safe_length (CLASSTYPE_VBASECLASSES (basetype
));
13661 basep
= &TREE_CHAIN (*basep
);
13664 max_vbases
+= max_dvbases
;
13666 TYPE_MARKED_P (ref
) = 1;
13668 /* The binfo slot should be empty, unless this is an (ill-formed)
13670 gcc_assert (!TYPE_BINFO (ref
) || TYPE_SIZE (ref
));
13672 gcc_assert (TYPE_MAIN_VARIANT (ref
) == ref
);
13674 binfo
= make_tree_binfo (max_bases
);
13676 TYPE_BINFO (ref
) = binfo
;
13677 BINFO_OFFSET (binfo
) = size_zero_node
;
13678 BINFO_TYPE (binfo
) = ref
;
13680 /* Apply base-class info set up to the variants of this type. */
13681 fixup_type_variants (ref
);
13685 vec_alloc (BINFO_BASE_ACCESSES (binfo
), max_bases
);
13686 /* A C++98 POD cannot have base classes. */
13687 CLASSTYPE_NON_LAYOUT_POD_P (ref
) = true;
13689 if (TREE_CODE (ref
) == UNION_TYPE
)
13690 error ("derived union %qT invalid", ref
);
13694 warning (OPT_Wmultiple_inheritance
,
13695 "%qT defined with multiple direct bases", ref
);
13699 vec_alloc (CLASSTYPE_VBASECLASSES (ref
), max_vbases
);
13702 warning (OPT_Wvirtual_inheritance
,
13703 "%qT defined with direct virtual base", ref
);
13706 for (igo_prev
= binfo
; base_list
; base_list
= TREE_CHAIN (base_list
))
13708 tree access
= TREE_PURPOSE (base_list
);
13709 int via_virtual
= TREE_TYPE (base_list
) != NULL_TREE
;
13710 tree basetype
= TREE_VALUE (base_list
);
13712 if (access
== access_default_node
)
13713 access
= default_access
;
13715 /* Before C++17, an aggregate cannot have base classes. In C++17, an
13716 aggregate can't have virtual, private, or protected base classes. */
13717 if (cxx_dialect
< cxx1z
13718 || access
!= access_public_node
13720 CLASSTYPE_NON_AGGREGATE (ref
) = true;
13722 if (PACK_EXPANSION_P (basetype
))
13723 basetype
= PACK_EXPANSION_PATTERN (basetype
);
13724 if (TREE_CODE (basetype
) == TYPE_DECL
)
13725 basetype
= TREE_TYPE (basetype
);
13726 if (!MAYBE_CLASS_TYPE_P (basetype
) || TREE_CODE (basetype
) == UNION_TYPE
)
13728 error ("base type %qT fails to be a struct or class type",
13733 base_binfo
= NULL_TREE
;
13734 if (CLASS_TYPE_P (basetype
) && !dependent_scope_p (basetype
))
13736 base_binfo
= TYPE_BINFO (basetype
);
13737 /* The original basetype could have been a typedef'd type. */
13738 basetype
= BINFO_TYPE (base_binfo
);
13740 /* Inherit flags from the base. */
13741 TYPE_HAS_NEW_OPERATOR (ref
)
13742 |= TYPE_HAS_NEW_OPERATOR (basetype
);
13743 TYPE_HAS_ARRAY_NEW_OPERATOR (ref
)
13744 |= TYPE_HAS_ARRAY_NEW_OPERATOR (basetype
);
13745 TYPE_GETS_DELETE (ref
) |= TYPE_GETS_DELETE (basetype
);
13746 TYPE_HAS_CONVERSION (ref
) |= TYPE_HAS_CONVERSION (basetype
);
13747 CLASSTYPE_DIAMOND_SHAPED_P (ref
)
13748 |= CLASSTYPE_DIAMOND_SHAPED_P (basetype
);
13749 CLASSTYPE_REPEATED_BASE_P (ref
)
13750 |= CLASSTYPE_REPEATED_BASE_P (basetype
);
13753 /* We must do this test after we've seen through a typedef
13755 if (TYPE_MARKED_P (basetype
))
13757 if (basetype
== ref
)
13758 error ("recursive type %qT undefined", basetype
);
13760 error ("duplicate base type %qT invalid", basetype
);
13764 if (PACK_EXPANSION_P (TREE_VALUE (base_list
)))
13765 /* Regenerate the pack expansion for the bases. */
13766 basetype
= make_pack_expansion (basetype
);
13768 TYPE_MARKED_P (basetype
) = 1;
13770 base_binfo
= copy_binfo (base_binfo
, basetype
, ref
,
13771 &igo_prev
, via_virtual
);
13772 if (!BINFO_INHERITANCE_CHAIN (base_binfo
))
13773 BINFO_INHERITANCE_CHAIN (base_binfo
) = binfo
;
13775 BINFO_BASE_APPEND (binfo
, base_binfo
);
13776 BINFO_BASE_ACCESS_APPEND (binfo
, access
);
13780 /* Update max_vbases to reflect the reality that we are dropping
13781 this base: if it reaches zero we want to undo the vec_alloc
13782 above to avoid inconsistencies during error-recovery: eg, in
13783 build_special_member_call, CLASSTYPE_VBASECLASSES non null
13784 and vtt null (c++/27952). */
13787 if (CLASS_TYPE_P (basetype
))
13789 -= vec_safe_length (CLASSTYPE_VBASECLASSES (basetype
));
13792 if (CLASSTYPE_VBASECLASSES (ref
)
13793 && max_vbases
== 0)
13794 vec_free (CLASSTYPE_VBASECLASSES (ref
));
13796 if (vec_safe_length (CLASSTYPE_VBASECLASSES (ref
)) < max_vbases
)
13797 /* If we didn't get max_vbases vbases, we must have shared at
13798 least one of them, and are therefore diamond shaped. */
13799 CLASSTYPE_DIAMOND_SHAPED_P (ref
) = 1;
13801 /* Unmark all the types. */
13802 for (i
= 0; BINFO_BASE_ITERATE (binfo
, i
, base_binfo
); i
++)
13803 TYPE_MARKED_P (BINFO_TYPE (base_binfo
)) = 0;
13804 TYPE_MARKED_P (ref
) = 0;
13806 /* Now see if we have a repeated base type. */
13807 if (!CLASSTYPE_REPEATED_BASE_P (ref
))
13809 for (base_binfo
= binfo
; base_binfo
;
13810 base_binfo
= TREE_CHAIN (base_binfo
))
13812 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo
)))
13814 CLASSTYPE_REPEATED_BASE_P (ref
) = 1;
13817 TYPE_MARKED_P (BINFO_TYPE (base_binfo
)) = 1;
13819 for (base_binfo
= binfo
; base_binfo
;
13820 base_binfo
= TREE_CHAIN (base_binfo
))
13821 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo
)))
13822 TYPE_MARKED_P (BINFO_TYPE (base_binfo
)) = 0;
13829 /* Copies the enum-related properties from type SRC to type DST.
13830 Used with the underlying type of an enum and the enum itself. */
13832 copy_type_enum (tree dst
, tree src
)
13835 for (t
= dst
; t
; t
= TYPE_NEXT_VARIANT (t
))
13837 TYPE_MIN_VALUE (t
) = TYPE_MIN_VALUE (src
);
13838 TYPE_MAX_VALUE (t
) = TYPE_MAX_VALUE (src
);
13839 TYPE_SIZE (t
) = TYPE_SIZE (src
);
13840 TYPE_SIZE_UNIT (t
) = TYPE_SIZE_UNIT (src
);
13841 SET_TYPE_MODE (dst
, TYPE_MODE (src
));
13842 TYPE_PRECISION (t
) = TYPE_PRECISION (src
);
13843 unsigned valign
= TYPE_ALIGN (src
);
13844 if (TYPE_USER_ALIGN (t
))
13845 valign
= MAX (valign
, TYPE_ALIGN (t
));
13847 TYPE_USER_ALIGN (t
) = TYPE_USER_ALIGN (src
);
13848 SET_TYPE_ALIGN (t
, valign
);
13849 TYPE_UNSIGNED (t
) = TYPE_UNSIGNED (src
);
13853 /* Begin compiling the definition of an enumeration type.
13856 if ENUMTYPE is not NULL_TREE then the type has alredy been found.
13858 UNDERLYING_TYPE is the type that will be used as the storage for
13859 the enumeration type. This should be NULL_TREE if no storage type
13862 ATTRIBUTES are any attributes specified after the enum-key.
13864 SCOPED_ENUM_P is true if this is a scoped enumeration type.
13866 if IS_NEW is not NULL, gets TRUE iff a new type is created.
13868 Returns the type object, as yet incomplete.
13869 Also records info about it so that build_enumerator
13870 may be used to declare the individual values as they are read. */
13873 start_enum (tree name
, tree enumtype
, tree underlying_type
,
13874 tree attributes
, bool scoped_enum_p
, bool *is_new
)
13876 tree prevtype
= NULL_TREE
;
13877 gcc_assert (identifier_p (name
));
13881 /* [C++0x dcl.enum]p5:
13883 If not explicitly specified, the underlying type of a scoped
13884 enumeration type is int. */
13885 if (!underlying_type
&& scoped_enum_p
)
13886 underlying_type
= integer_type_node
;
13888 if (underlying_type
)
13889 underlying_type
= cv_unqualified (underlying_type
);
13891 /* If this is the real definition for a previous forward reference,
13892 fill in the contents in the same object that used to be the
13893 forward reference. */
13895 enumtype
= lookup_and_check_tag (enum_type
, name
,
13896 /*tag_scope=*/ts_current
,
13897 /*template_header_p=*/false);
13899 /* In case of a template_decl, the only check that should be deferred
13900 to instantiation time is the comparison of underlying types. */
13901 if (enumtype
&& TREE_CODE (enumtype
) == ENUMERAL_TYPE
)
13903 if (scoped_enum_p
!= SCOPED_ENUM_P (enumtype
))
13905 error_at (input_location
, "scoped/unscoped mismatch "
13906 "in enum %q#T", enumtype
);
13907 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype
)),
13908 "previous definition here");
13909 enumtype
= error_mark_node
;
13911 else if (ENUM_FIXED_UNDERLYING_TYPE_P (enumtype
) != !! underlying_type
)
13913 error_at (input_location
, "underlying type mismatch "
13914 "in enum %q#T", enumtype
);
13915 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype
)),
13916 "previous definition here");
13917 enumtype
= error_mark_node
;
13919 else if (underlying_type
&& ENUM_UNDERLYING_TYPE (enumtype
)
13920 && !dependent_type_p (underlying_type
)
13921 && !dependent_type_p (ENUM_UNDERLYING_TYPE (enumtype
))
13922 && !same_type_p (underlying_type
,
13923 ENUM_UNDERLYING_TYPE (enumtype
)))
13925 error_at (input_location
, "different underlying type "
13926 "in enum %q#T", enumtype
);
13927 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype
)),
13928 "previous definition here");
13929 underlying_type
= NULL_TREE
;
13933 if (!enumtype
|| TREE_CODE (enumtype
) != ENUMERAL_TYPE
13934 || processing_template_decl
)
13936 /* In case of error, make a dummy enum to allow parsing to
13938 if (enumtype
== error_mark_node
)
13940 name
= make_anon_name ();
13941 enumtype
= NULL_TREE
;
13944 /* enumtype may be an ENUMERAL_TYPE if this is a redefinition
13945 of an opaque enum, or an opaque enum of an already defined
13946 enumeration (C++0x only).
13947 In any other case, it'll be NULL_TREE. */
13953 prevtype
= enumtype
;
13955 /* Do not push the decl more than once, unless we need to
13956 compare underlying types at instantiation time */
13958 || TREE_CODE (enumtype
) != ENUMERAL_TYPE
13959 || (underlying_type
13960 && dependent_type_p (underlying_type
))
13961 || (ENUM_UNDERLYING_TYPE (enumtype
)
13962 && dependent_type_p (ENUM_UNDERLYING_TYPE (enumtype
))))
13964 enumtype
= cxx_make_type (ENUMERAL_TYPE
);
13965 enumtype
= pushtag (name
, enumtype
, /*tag_scope=*/ts_current
);
13968 enumtype
= xref_tag (enum_type
, name
, /*tag_scope=*/ts_current
,
13971 if (enumtype
== error_mark_node
)
13972 return error_mark_node
;
13974 /* The enum is considered opaque until the opening '{' of the
13975 enumerator list. */
13976 SET_OPAQUE_ENUM_P (enumtype
, true);
13977 ENUM_FIXED_UNDERLYING_TYPE_P (enumtype
) = !! underlying_type
;
13980 SET_SCOPED_ENUM_P (enumtype
, scoped_enum_p
);
13982 cplus_decl_attributes (&enumtype
, attributes
, (int)ATTR_FLAG_TYPE_IN_PLACE
);
13984 if (underlying_type
)
13986 if (ENUM_UNDERLYING_TYPE (enumtype
))
13987 /* We already checked that it matches, don't change it to a different
13988 typedef variant. */;
13989 else if (CP_INTEGRAL_TYPE_P (underlying_type
))
13991 copy_type_enum (enumtype
, underlying_type
);
13992 ENUM_UNDERLYING_TYPE (enumtype
) = underlying_type
;
13994 else if (dependent_type_p (underlying_type
))
13995 ENUM_UNDERLYING_TYPE (enumtype
) = underlying_type
;
13997 error ("underlying type %<%T%> of %<%T%> must be an integral type",
13998 underlying_type
, enumtype
);
14001 /* If into a template class, the returned enum is always the first
14002 declaration (opaque or not) seen. This way all the references to
14003 this type will be to the same declaration. The following ones are used
14004 only to check for definition errors. */
14005 if (prevtype
&& processing_template_decl
)
14011 /* After processing and defining all the values of an enumeration type,
14012 install their decls in the enumeration type.
14013 ENUMTYPE is the type object. */
14016 finish_enum_value_list (tree enumtype
)
14019 tree underlying_type
;
14022 tree minnode
, maxnode
;
14025 bool fixed_underlying_type_p
14026 = ENUM_UNDERLYING_TYPE (enumtype
) != NULL_TREE
;
14028 /* We built up the VALUES in reverse order. */
14029 TYPE_VALUES (enumtype
) = nreverse (TYPE_VALUES (enumtype
));
14031 /* For an enum defined in a template, just set the type of the values;
14032 all further processing is postponed until the template is
14033 instantiated. We need to set the type so that tsubst of a CONST_DECL
14035 if (processing_template_decl
)
14037 for (values
= TYPE_VALUES (enumtype
);
14039 values
= TREE_CHAIN (values
))
14040 TREE_TYPE (TREE_VALUE (values
)) = enumtype
;
14044 /* Determine the minimum and maximum values of the enumerators. */
14045 if (TYPE_VALUES (enumtype
))
14047 minnode
= maxnode
= NULL_TREE
;
14049 for (values
= TYPE_VALUES (enumtype
);
14051 values
= TREE_CHAIN (values
))
14053 decl
= TREE_VALUE (values
);
14055 /* [dcl.enum]: Following the closing brace of an enum-specifier,
14056 each enumerator has the type of its enumeration. Prior to the
14057 closing brace, the type of each enumerator is the type of its
14058 initializing value. */
14059 TREE_TYPE (decl
) = enumtype
;
14061 /* Update the minimum and maximum values, if appropriate. */
14062 value
= DECL_INITIAL (decl
);
14063 if (value
== error_mark_node
)
14064 value
= integer_zero_node
;
14065 /* Figure out what the minimum and maximum values of the
14066 enumerators are. */
14068 minnode
= maxnode
= value
;
14069 else if (tree_int_cst_lt (maxnode
, value
))
14071 else if (tree_int_cst_lt (value
, minnode
))
14078 If the enumerator-list is empty, the underlying type is as if
14079 the enumeration had a single enumerator with value 0. */
14080 minnode
= maxnode
= integer_zero_node
;
14082 if (!fixed_underlying_type_p
)
14084 /* Compute the number of bits require to represent all values of the
14085 enumeration. We must do this before the type of MINNODE and
14086 MAXNODE are transformed, since tree_int_cst_min_precision relies
14087 on the TREE_TYPE of the value it is passed. */
14088 signop sgn
= tree_int_cst_sgn (minnode
) >= 0 ? UNSIGNED
: SIGNED
;
14089 int lowprec
= tree_int_cst_min_precision (minnode
, sgn
);
14090 int highprec
= tree_int_cst_min_precision (maxnode
, sgn
);
14091 int precision
= MAX (lowprec
, highprec
);
14093 bool use_short_enum
;
14095 /* Determine the underlying type of the enumeration.
14099 The underlying type of an enumeration is an integral type that
14100 can represent all the enumerator values defined in the
14101 enumeration. It is implementation-defined which integral type is
14102 used as the underlying type for an enumeration except that the
14103 underlying type shall not be larger than int unless the value of
14104 an enumerator cannot fit in an int or unsigned int.
14106 We use "int" or an "unsigned int" as the underlying type, even if
14107 a smaller integral type would work, unless the user has
14108 explicitly requested that we use the smallest possible type. The
14109 user can request that for all enumerations with a command line
14110 flag, or for just one enumeration with an attribute. */
14112 use_short_enum
= flag_short_enums
14113 || lookup_attribute ("packed", TYPE_ATTRIBUTES (enumtype
));
14115 /* If the precision of the type was specified with an attribute and it
14116 was too small, give an error. Otherwise, use it. */
14117 if (TYPE_PRECISION (enumtype
))
14119 if (precision
> TYPE_PRECISION (enumtype
))
14120 error ("specified mode too small for enumeral values");
14123 use_short_enum
= true;
14124 precision
= TYPE_PRECISION (enumtype
);
14128 for (itk
= (use_short_enum
? itk_char
: itk_int
);
14132 underlying_type
= integer_types
[itk
];
14133 if (underlying_type
!= NULL_TREE
14134 && TYPE_PRECISION (underlying_type
) >= precision
14135 && TYPE_SIGN (underlying_type
) == sgn
)
14138 if (itk
== itk_none
)
14142 IF no integral type can represent all the enumerator values, the
14143 enumeration is ill-formed. */
14144 error ("no integral type can represent all of the enumerator values "
14145 "for %qT", enumtype
);
14146 precision
= TYPE_PRECISION (long_long_integer_type_node
);
14147 underlying_type
= integer_types
[itk_unsigned_long_long
];
14152 The value of sizeof() applied to an enumeration type, an object
14153 of an enumeration type, or an enumerator, is the value of sizeof()
14154 applied to the underlying type. */
14155 copy_type_enum (enumtype
, underlying_type
);
14157 /* Compute the minimum and maximum values for the type.
14161 For an enumeration where emin is the smallest enumerator and emax
14162 is the largest, the values of the enumeration are the values of the
14163 underlying type in the range bmin to bmax, where bmin and bmax are,
14164 respectively, the smallest and largest values of the smallest bit-
14165 field that can store emin and emax. */
14167 /* The middle-end currently assumes that types with TYPE_PRECISION
14168 narrower than their underlying type are suitably zero or sign
14169 extended to fill their mode. Similarly, it assumes that the front
14170 end assures that a value of a particular type must be within
14171 TYPE_MIN_VALUE and TYPE_MAX_VALUE.
14173 We used to set these fields based on bmin and bmax, but that led
14174 to invalid assumptions like optimizing away bounds checking. So
14175 now we just set the TYPE_PRECISION, TYPE_MIN_VALUE, and
14176 TYPE_MAX_VALUE to the values for the mode above and only restrict
14177 the ENUM_UNDERLYING_TYPE for the benefit of diagnostics. */
14178 ENUM_UNDERLYING_TYPE (enumtype
)
14179 = build_distinct_type_copy (underlying_type
);
14180 TYPE_PRECISION (ENUM_UNDERLYING_TYPE (enumtype
)) = precision
;
14181 set_min_and_max_values_for_integral_type
14182 (ENUM_UNDERLYING_TYPE (enumtype
), precision
, sgn
);
14184 /* If -fstrict-enums, still constrain TYPE_MIN/MAX_VALUE. */
14185 if (flag_strict_enums
)
14186 set_min_and_max_values_for_integral_type (enumtype
, precision
, sgn
);
14189 underlying_type
= ENUM_UNDERLYING_TYPE (enumtype
);
14191 /* Convert each of the enumerators to the type of the underlying
14192 type of the enumeration. */
14193 for (values
= TYPE_VALUES (enumtype
); values
; values
= TREE_CHAIN (values
))
14195 location_t saved_location
;
14197 decl
= TREE_VALUE (values
);
14198 saved_location
= input_location
;
14199 input_location
= DECL_SOURCE_LOCATION (decl
);
14200 if (fixed_underlying_type_p
)
14201 /* If the enumeration type has a fixed underlying type, we
14202 already checked all of the enumerator values. */
14203 value
= DECL_INITIAL (decl
);
14205 value
= perform_implicit_conversion (underlying_type
,
14206 DECL_INITIAL (decl
),
14207 tf_warning_or_error
);
14208 input_location
= saved_location
;
14210 /* Do not clobber shared ints. */
14211 value
= copy_node (value
);
14213 TREE_TYPE (value
) = enumtype
;
14214 DECL_INITIAL (decl
) = value
;
14217 /* Fix up all variant types of this enum type. */
14218 for (t
= TYPE_MAIN_VARIANT (enumtype
); t
; t
= TYPE_NEXT_VARIANT (t
))
14219 TYPE_VALUES (t
) = TYPE_VALUES (enumtype
);
14221 if (at_class_scope_p ()
14222 && COMPLETE_TYPE_P (current_class_type
)
14223 && UNSCOPED_ENUM_P (enumtype
))
14224 insert_late_enum_def_into_classtype_sorted_fields (enumtype
,
14225 current_class_type
);
14227 /* Finish debugging output for this type. */
14228 rest_of_type_compilation (enumtype
, namespace_bindings_p ());
14230 /* Each enumerator now has the type of its enumeration. Clear the cache
14231 so that this change in types doesn't confuse us later on. */
14232 clear_cv_and_fold_caches ();
14235 /* Finishes the enum type. This is called only the first time an
14236 enumeration is seen, be it opaque or odinary.
14237 ENUMTYPE is the type object. */
14240 finish_enum (tree enumtype
)
14242 if (processing_template_decl
)
14244 if (at_function_scope_p ())
14245 add_stmt (build_min (TAG_DEFN
, enumtype
));
14249 /* If this is a forward declaration, there should not be any variants,
14250 though we can get a variant in the middle of an enum-specifier with
14251 wacky code like 'enum E { e = sizeof(const E*) };' */
14252 gcc_assert (enumtype
== TYPE_MAIN_VARIANT (enumtype
)
14253 && (TYPE_VALUES (enumtype
)
14254 || !TYPE_NEXT_VARIANT (enumtype
)));
14257 /* Build and install a CONST_DECL for an enumeration constant of the
14258 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
14259 Apply ATTRIBUTES if available. LOC is the location of NAME.
14260 Assignment of sequential values by default is handled here. */
14263 build_enumerator (tree name
, tree value
, tree enumtype
, tree attributes
,
14270 /* scalar_constant_value will pull out this expression, so make sure
14271 it's folded as appropriate. */
14272 if (processing_template_decl
)
14273 value
= fold_non_dependent_expr (value
);
14275 /* If the VALUE was erroneous, pretend it wasn't there; that will
14276 result in the enum being assigned the next value in sequence. */
14277 if (value
== error_mark_node
)
14280 /* Remove no-op casts from the value. */
14282 STRIP_TYPE_NOPS (value
);
14284 if (! processing_template_decl
)
14286 /* Validate and default VALUE. */
14287 if (value
!= NULL_TREE
)
14289 if (!ENUM_UNDERLYING_TYPE (enumtype
))
14291 tree tmp_value
= build_expr_type_conversion (WANT_INT
| WANT_ENUM
,
14296 else if (! INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P
14297 (TREE_TYPE (value
)))
14298 value
= perform_implicit_conversion_flags
14299 (ENUM_UNDERLYING_TYPE (enumtype
), value
, tf_warning_or_error
,
14300 LOOKUP_IMPLICIT
| LOOKUP_NO_NARROWING
);
14302 if (value
== error_mark_node
)
14305 if (value
!= NULL_TREE
)
14307 if (! INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P
14308 (TREE_TYPE (value
)))
14310 error ("enumerator value for %qD must have integral or "
14311 "unscoped enumeration type", name
);
14316 value
= cxx_constant_value (value
);
14318 if (TREE_CODE (value
) != INTEGER_CST
)
14320 error ("enumerator value for %qD is not an integer "
14328 /* Default based on previous value. */
14329 if (value
== NULL_TREE
)
14331 if (TYPE_VALUES (enumtype
))
14336 /* C++03 7.2/4: If no initializer is specified for the first
14337 enumerator, the type is an unspecified integral
14338 type. Otherwise the type is the same as the type of the
14339 initializing value of the preceding enumerator unless the
14340 incremented value is not representable in that type, in
14341 which case the type is an unspecified integral type
14342 sufficient to contain the incremented value. */
14343 prev_value
= DECL_INITIAL (TREE_VALUE (TYPE_VALUES (enumtype
)));
14344 if (error_operand_p (prev_value
))
14345 value
= error_mark_node
;
14348 tree type
= TREE_TYPE (prev_value
);
14349 signop sgn
= TYPE_SIGN (type
);
14350 widest_int wi
= wi::add (wi::to_widest (prev_value
), 1, sgn
,
14354 bool pos
= !wi::neg_p (wi
, sgn
);
14355 if (!wi::fits_to_tree_p (wi
, type
))
14358 for (itk
= itk_int
; itk
!= itk_none
; itk
++)
14360 type
= integer_types
[itk
];
14361 if (type
!= NULL_TREE
14362 && (pos
|| !TYPE_UNSIGNED (type
))
14363 && wi::fits_to_tree_p (wi
, type
))
14366 if (type
&& cxx_dialect
< cxx11
14367 && itk
> itk_unsigned_long
)
14368 pedwarn (input_location
, OPT_Wlong_long
, pos
? "\
14369 incremented enumerator value is too large for %<unsigned long%>" : "\
14370 incremented enumerator value is too large for %<long%>");
14372 if (type
== NULL_TREE
)
14375 value
= wide_int_to_tree (type
, wi
);
14380 error ("overflow in enumeration values at %qD", name
);
14381 value
= error_mark_node
;
14386 value
= integer_zero_node
;
14389 /* Remove no-op casts from the value. */
14390 STRIP_TYPE_NOPS (value
);
14392 /* If the underlying type of the enum is fixed, check whether
14393 the enumerator values fits in the underlying type. If it
14394 does not fit, the program is ill-formed [C++0x dcl.enum]. */
14395 if (ENUM_UNDERLYING_TYPE (enumtype
)
14397 && TREE_CODE (value
) == INTEGER_CST
)
14399 if (!int_fits_type_p (value
, ENUM_UNDERLYING_TYPE (enumtype
)))
14400 error ("enumerator value %E is outside the range of underlying "
14401 "type %<%T%>", value
, ENUM_UNDERLYING_TYPE (enumtype
));
14403 /* Convert the value to the appropriate type. */
14404 value
= fold_convert (ENUM_UNDERLYING_TYPE (enumtype
), value
);
14408 /* C++ associates enums with global, function, or class declarations. */
14409 context
= current_scope ();
14411 /* Build the actual enumeration constant. Note that the enumeration
14412 constants have the underlying type of the enum (if it is fixed)
14413 or the type of their initializer (if the underlying type of the
14414 enum is not fixed):
14418 If the underlying type is fixed, the type of each enumerator
14419 prior to the closing brace is the underlying type; if the
14420 initializing value of an enumerator cannot be represented by
14421 the underlying type, the program is ill-formed. If the
14422 underlying type is not fixed, the type of each enumerator is
14423 the type of its initializing value.
14425 If the underlying type is not fixed, it will be computed by
14426 finish_enum and we will reset the type of this enumerator. Of
14427 course, if we're processing a template, there may be no value. */
14428 type
= value
? TREE_TYPE (value
) : NULL_TREE
;
14430 decl
= build_decl (loc
, CONST_DECL
, name
, type
);
14432 DECL_CONTEXT (decl
) = enumtype
;
14433 TREE_CONSTANT (decl
) = 1;
14434 TREE_READONLY (decl
) = 1;
14435 DECL_INITIAL (decl
) = value
;
14438 cplus_decl_attributes (&decl
, attributes
, 0);
14440 if (context
&& context
== current_class_type
&& !SCOPED_ENUM_P (enumtype
))
14442 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
14443 on the TYPE_FIELDS list for `S'. (That's so that you can say
14444 things like `S::i' later.) */
14446 /* The enumerator may be getting declared outside of its enclosing
14449 class S { public: enum E : int; }; enum S::E : int { i = 7; };
14451 For which case we need to make sure that the access of `S::i'
14452 matches the access of `S::E'. */
14453 tree saved_cas
= current_access_specifier
;
14454 if (TREE_PRIVATE (TYPE_NAME (enumtype
)))
14455 current_access_specifier
= access_private_node
;
14456 else if (TREE_PROTECTED (TYPE_NAME (enumtype
)))
14457 current_access_specifier
= access_protected_node
;
14459 current_access_specifier
= access_public_node
;
14461 finish_member_declaration (decl
);
14463 current_access_specifier
= saved_cas
;
14468 /* Add this enumeration constant to the list for this type. */
14469 TYPE_VALUES (enumtype
) = tree_cons (name
, decl
, TYPE_VALUES (enumtype
));
14472 /* Look for an enumerator with the given NAME within the enumeration
14473 type ENUMTYPE. This routine is used primarily for qualified name
14474 lookup into an enumerator in C++0x, e.g.,
14476 enum class Color { Red, Green, Blue };
14478 Color color = Color::Red;
14480 Returns the value corresponding to the enumerator, or
14481 NULL_TREE if no such enumerator was found. */
14483 lookup_enumerator (tree enumtype
, tree name
)
14486 gcc_assert (enumtype
&& TREE_CODE (enumtype
) == ENUMERAL_TYPE
);
14488 e
= purpose_member (name
, TYPE_VALUES (enumtype
));
14489 return e
? TREE_VALUE (e
) : NULL_TREE
;
14493 /* We're defining DECL. Make sure that its type is OK. */
14496 check_function_type (tree decl
, tree current_function_parms
)
14498 tree fntype
= TREE_TYPE (decl
);
14499 tree return_type
= complete_type (TREE_TYPE (fntype
));
14501 /* In a function definition, arg types must be complete. */
14502 require_complete_types_for_parms (current_function_parms
);
14504 if (dependent_type_p (return_type
)
14505 || type_uses_auto (return_type
))
14507 if (!COMPLETE_OR_VOID_TYPE_P (return_type
))
14509 tree args
= TYPE_ARG_TYPES (fntype
);
14511 error ("return type %q#T is incomplete", return_type
);
14513 /* Make it return void instead. */
14514 if (TREE_CODE (fntype
) == METHOD_TYPE
)
14515 fntype
= build_method_type_directly (TREE_TYPE (TREE_VALUE (args
)),
14517 TREE_CHAIN (args
));
14519 fntype
= build_function_type (void_type_node
, args
);
14521 = build_exception_variant (fntype
,
14522 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (decl
)));
14523 fntype
= (cp_build_type_attribute_variant
14524 (fntype
, TYPE_ATTRIBUTES (TREE_TYPE (decl
))));
14525 TREE_TYPE (decl
) = fntype
;
14528 abstract_virtuals_error (decl
, TREE_TYPE (fntype
));
14531 /* True iff FN is an implicitly-defined default constructor. */
14534 implicit_default_ctor_p (tree fn
)
14536 return (DECL_CONSTRUCTOR_P (fn
)
14537 && !user_provided_p (fn
)
14538 && sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (fn
)));
14541 /* Clobber the contents of *this to let the back end know that the object
14542 storage is dead when we enter the constructor or leave the destructor. */
14545 build_clobber_this ()
14547 /* Clobbering an empty base is pointless, and harmful if its one byte
14548 TYPE_SIZE overlays real data. */
14549 if (is_empty_class (current_class_type
))
14552 /* If we have virtual bases, clobber the whole object, but only if we're in
14553 charge. If we don't have virtual bases, clobber the as-base type so we
14554 don't mess with tail padding. */
14555 bool vbases
= CLASSTYPE_VBASECLASSES (current_class_type
);
14557 tree ctype
= current_class_type
;
14559 ctype
= CLASSTYPE_AS_BASE (ctype
);
14561 tree clobber
= build_constructor (ctype
, NULL
);
14562 TREE_THIS_VOLATILE (clobber
) = true;
14564 tree thisref
= current_class_ref
;
14565 if (ctype
!= current_class_type
)
14567 thisref
= build_nop (build_reference_type (ctype
), current_class_ptr
);
14568 thisref
= convert_from_reference (thisref
);
14571 tree exprstmt
= build2 (MODIFY_EXPR
, void_type_node
, thisref
, clobber
);
14573 exprstmt
= build_if_in_charge (exprstmt
);
14578 /* Create the FUNCTION_DECL for a function definition.
14579 DECLSPECS and DECLARATOR are the parts of the declaration;
14580 they describe the function's name and the type it returns,
14581 but twisted together in a fashion that parallels the syntax of C.
14583 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
14584 DECLARATOR is really the DECL for the function we are about to
14585 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
14586 indicating that the function is an inline defined in-class.
14588 This function creates a binding context for the function body
14589 as well as setting up the FUNCTION_DECL in current_function_decl.
14591 For C++, we must first check whether that datum makes any sense.
14592 For example, "class A local_a(1,2);" means that variable local_a
14593 is an aggregate of type A, which should have a constructor
14594 applied to it with the argument list [1, 2].
14596 On entry, DECL_INITIAL (decl1) should be NULL_TREE or error_mark_node,
14597 or may be a BLOCK if the function has been defined previously
14598 in this translation unit. On exit, DECL_INITIAL (decl1) will be
14599 error_mark_node if the function has never been defined, or
14600 a BLOCK if the function has been defined somewhere. */
14603 start_preparsed_function (tree decl1
, tree attrs
, int flags
)
14605 tree ctype
= NULL_TREE
;
14608 int doing_friend
= 0;
14609 cp_binding_level
*bl
;
14610 tree current_function_parms
;
14611 struct c_fileinfo
*finfo
14612 = get_fileinfo (LOCATION_FILE (DECL_SOURCE_LOCATION (decl1
)));
14613 bool honor_interface
;
14615 /* Sanity check. */
14616 gcc_assert (VOID_TYPE_P (TREE_VALUE (void_list_node
)));
14617 gcc_assert (TREE_CHAIN (void_list_node
) == NULL_TREE
);
14619 fntype
= TREE_TYPE (decl1
);
14620 if (TREE_CODE (fntype
) == METHOD_TYPE
)
14621 ctype
= TYPE_METHOD_BASETYPE (fntype
);
14623 /* ISO C++ 11.4/5. A friend function defined in a class is in
14624 the (lexical) scope of the class in which it is defined. */
14625 if (!ctype
&& DECL_FRIEND_P (decl1
))
14627 ctype
= DECL_FRIEND_CONTEXT (decl1
);
14629 /* CTYPE could be null here if we're dealing with a template;
14630 for example, `inline friend float foo()' inside a template
14631 will have no CTYPE set. */
14632 if (ctype
&& TREE_CODE (ctype
) != RECORD_TYPE
)
14638 if (DECL_DECLARED_INLINE_P (decl1
)
14639 && lookup_attribute ("noinline", attrs
))
14640 warning_at (DECL_SOURCE_LOCATION (decl1
), 0,
14641 "inline function %qD given attribute noinline", decl1
);
14643 /* Handle gnu_inline attribute. */
14644 if (GNU_INLINE_P (decl1
))
14646 DECL_EXTERNAL (decl1
) = 1;
14647 DECL_NOT_REALLY_EXTERN (decl1
) = 0;
14648 DECL_INTERFACE_KNOWN (decl1
) = 1;
14649 DECL_DISREGARD_INLINE_LIMITS (decl1
) = 1;
14652 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl1
))
14653 /* This is a constructor, we must ensure that any default args
14654 introduced by this definition are propagated to the clones
14655 now. The clones are used directly in overload resolution. */
14656 adjust_clone_args (decl1
);
14658 /* Sometimes we don't notice that a function is a static member, and
14659 build a METHOD_TYPE for it. Fix that up now. */
14660 gcc_assert (!(ctype
!= NULL_TREE
&& DECL_STATIC_FUNCTION_P (decl1
)
14661 && TREE_CODE (TREE_TYPE (decl1
)) == METHOD_TYPE
));
14663 /* Set up current_class_type, and enter the scope of the class, if
14666 push_nested_class (ctype
);
14667 else if (DECL_STATIC_FUNCTION_P (decl1
))
14668 push_nested_class (DECL_CONTEXT (decl1
));
14670 /* Now that we have entered the scope of the class, we must restore
14671 the bindings for any template parameters surrounding DECL1, if it
14672 is an inline member template. (Order is important; consider the
14673 case where a template parameter has the same name as a field of
14674 the class.) It is not until after this point that
14675 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
14676 if (flags
& SF_INCLASS_INLINE
)
14677 maybe_begin_member_template_processing (decl1
);
14679 /* Effective C++ rule 15. */
14681 && DECL_OVERLOADED_OPERATOR_P (decl1
) == NOP_EXPR
14682 && VOID_TYPE_P (TREE_TYPE (fntype
)))
14683 warning (OPT_Weffc__
, "%<operator=%> should return a reference to %<*this%>");
14685 /* Make the init_value nonzero so pushdecl knows this is not tentative.
14686 error_mark_node is replaced below (in poplevel) with the BLOCK. */
14687 if (!DECL_INITIAL (decl1
))
14688 DECL_INITIAL (decl1
) = error_mark_node
;
14690 /* This function exists in static storage.
14691 (This does not mean `static' in the C sense!) */
14692 TREE_STATIC (decl1
) = 1;
14694 /* We must call push_template_decl after current_class_type is set
14695 up. (If we are processing inline definitions after exiting a
14696 class scope, current_class_type will be NULL_TREE until set above
14697 by push_nested_class.) */
14698 if (processing_template_decl
)
14700 tree newdecl1
= push_template_decl (decl1
);
14701 if (newdecl1
== error_mark_node
)
14703 if (ctype
|| DECL_STATIC_FUNCTION_P (decl1
))
14704 pop_nested_class ();
14710 /* We are now in the scope of the function being defined. */
14711 current_function_decl
= decl1
;
14713 /* Save the parm names or decls from this function's declarator
14714 where store_parm_decls will find them. */
14715 current_function_parms
= DECL_ARGUMENTS (decl1
);
14717 /* Make sure the parameter and return types are reasonable. When
14718 you declare a function, these types can be incomplete, but they
14719 must be complete when you define the function. */
14720 check_function_type (decl1
, current_function_parms
);
14722 /* Build the return declaration for the function. */
14723 restype
= TREE_TYPE (fntype
);
14725 if (DECL_RESULT (decl1
) == NULL_TREE
)
14729 resdecl
= build_decl (input_location
, RESULT_DECL
, 0, restype
);
14730 DECL_ARTIFICIAL (resdecl
) = 1;
14731 DECL_IGNORED_P (resdecl
) = 1;
14732 DECL_RESULT (decl1
) = resdecl
;
14734 cp_apply_type_quals_to_decl (cp_type_quals (restype
), resdecl
);
14737 /* Let the user know we're compiling this function. */
14738 announce_function (decl1
);
14740 /* Record the decl so that the function name is defined.
14741 If we already have a decl for this name, and it is a FUNCTION_DECL,
14742 use the old decl. */
14743 if (!processing_template_decl
&& !(flags
& SF_PRE_PARSED
))
14745 /* A specialization is not used to guide overload resolution. */
14746 if (!DECL_FUNCTION_MEMBER_P (decl1
)
14747 && !(DECL_USE_TEMPLATE (decl1
) &&
14748 PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl1
))))
14750 tree olddecl
= pushdecl (decl1
);
14752 if (olddecl
== error_mark_node
)
14753 /* If something went wrong when registering the declaration,
14754 use DECL1; we have to have a FUNCTION_DECL to use when
14755 parsing the body of the function. */
14759 /* Otherwise, OLDDECL is either a previous declaration
14760 of the same function or DECL1 itself. */
14762 if (warn_missing_declarations
14763 && olddecl
== decl1
14764 && !DECL_MAIN_P (decl1
)
14765 && TREE_PUBLIC (decl1
)
14766 && !DECL_DECLARED_INLINE_P (decl1
))
14770 /* Check whether DECL1 is in an anonymous
14772 for (context
= DECL_CONTEXT (decl1
);
14774 context
= DECL_CONTEXT (context
))
14776 if (TREE_CODE (context
) == NAMESPACE_DECL
14777 && DECL_NAME (context
) == NULL_TREE
)
14781 if (context
== NULL
)
14782 warning_at (DECL_SOURCE_LOCATION (decl1
),
14783 OPT_Wmissing_declarations
,
14784 "no previous declaration for %qD", decl1
);
14792 /* We need to set the DECL_CONTEXT. */
14793 if (!DECL_CONTEXT (decl1
) && DECL_TEMPLATE_INFO (decl1
))
14794 DECL_CONTEXT (decl1
) = DECL_CONTEXT (DECL_TI_TEMPLATE (decl1
));
14796 fntype
= TREE_TYPE (decl1
);
14797 restype
= TREE_TYPE (fntype
);
14799 /* If #pragma weak applies, mark the decl appropriately now.
14800 The pragma only applies to global functions. Because
14801 determining whether or not the #pragma applies involves
14802 computing the mangled name for the declaration, we cannot
14803 apply the pragma until after we have merged this declaration
14804 with any previous declarations; if the original declaration
14805 has a linkage specification, that specification applies to
14806 the definition as well, and may affect the mangled name. */
14807 if (DECL_FILE_SCOPE_P (decl1
))
14808 maybe_apply_pragma_weak (decl1
);
14811 /* Reset this in case the call to pushdecl changed it. */
14812 current_function_decl
= decl1
;
14814 gcc_assert (DECL_INITIAL (decl1
));
14816 /* This function may already have been parsed, in which case just
14817 return; our caller will skip over the body without parsing. */
14818 if (DECL_INITIAL (decl1
) != error_mark_node
)
14821 /* Initialize RTL machinery. We cannot do this until
14822 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
14823 even when processing a template; this is how we get
14824 CFUN set up, and our per-function variables initialized.
14825 FIXME factor out the non-RTL stuff. */
14826 bl
= current_binding_level
;
14827 allocate_struct_function (decl1
, processing_template_decl
);
14829 /* Initialize the language data structures. Whenever we start
14830 a new function, we destroy temporaries in the usual way. */
14831 cfun
->language
= ggc_cleared_alloc
<language_function
> ();
14832 current_stmt_tree ()->stmts_are_full_exprs_p
= 1;
14833 current_binding_level
= bl
;
14835 if (!processing_template_decl
&& type_uses_auto (restype
))
14837 FNDECL_USED_AUTO (decl1
) = true;
14838 current_function_auto_return_pattern
= restype
;
14841 /* Start the statement-tree, start the tree now. */
14842 DECL_SAVED_TREE (decl1
) = push_stmt_list ();
14844 /* If we are (erroneously) defining a function that we have already
14845 defined before, wipe out what we knew before. */
14846 if (!DECL_PENDING_INLINE_P (decl1
))
14847 DECL_SAVED_FUNCTION_DATA (decl1
) = NULL
;
14849 if (ctype
&& !doing_friend
&& !DECL_STATIC_FUNCTION_P (decl1
))
14851 /* We know that this was set up by `grokclassfn'. We do not
14852 wait until `store_parm_decls', since evil parse errors may
14853 never get us to that point. Here we keep the consistency
14854 between `current_class_type' and `current_class_ptr'. */
14855 tree t
= DECL_ARGUMENTS (decl1
);
14857 gcc_assert (t
!= NULL_TREE
&& TREE_CODE (t
) == PARM_DECL
);
14858 gcc_assert (TYPE_PTR_P (TREE_TYPE (t
)));
14860 cp_function_chain
->x_current_class_ref
14861 = cp_build_indirect_ref (t
, RO_NULL
, tf_warning_or_error
);
14862 /* Set this second to avoid shortcut in cp_build_indirect_ref. */
14863 cp_function_chain
->x_current_class_ptr
= t
;
14865 /* Constructors and destructors need to know whether they're "in
14866 charge" of initializing virtual base classes. */
14867 t
= DECL_CHAIN (t
);
14868 if (DECL_HAS_IN_CHARGE_PARM_P (decl1
))
14870 current_in_charge_parm
= t
;
14871 t
= DECL_CHAIN (t
);
14873 if (DECL_HAS_VTT_PARM_P (decl1
))
14875 gcc_assert (DECL_NAME (t
) == vtt_parm_identifier
);
14876 current_vtt_parm
= t
;
14880 honor_interface
= (!DECL_TEMPLATE_INSTANTIATION (decl1
)
14881 /* Implicitly-defined methods (like the
14882 destructor for a class in which no destructor
14883 is explicitly declared) must not be defined
14884 until their definition is needed. So, we
14885 ignore interface specifications for
14886 compiler-generated functions. */
14887 && !DECL_ARTIFICIAL (decl1
));
14889 if (processing_template_decl
)
14890 /* Don't mess with interface flags. */;
14891 else if (DECL_INTERFACE_KNOWN (decl1
))
14893 tree ctx
= decl_function_context (decl1
);
14895 if (DECL_NOT_REALLY_EXTERN (decl1
))
14896 DECL_EXTERNAL (decl1
) = 0;
14898 if (ctx
!= NULL_TREE
&& vague_linkage_p (ctx
))
14899 /* This is a function in a local class in an extern inline
14900 or template function. */
14901 comdat_linkage (decl1
);
14903 /* If this function belongs to an interface, it is public.
14904 If it belongs to someone else's interface, it is also external.
14905 This only affects inlines and template instantiations. */
14906 else if (!finfo
->interface_unknown
&& honor_interface
)
14908 if (DECL_DECLARED_INLINE_P (decl1
)
14909 || DECL_TEMPLATE_INSTANTIATION (decl1
))
14911 DECL_EXTERNAL (decl1
)
14912 = (finfo
->interface_only
14913 || (DECL_DECLARED_INLINE_P (decl1
)
14914 && ! flag_implement_inlines
14915 && !DECL_VINDEX (decl1
)));
14917 /* For WIN32 we also want to put these in linkonce sections. */
14918 maybe_make_one_only (decl1
);
14921 DECL_EXTERNAL (decl1
) = 0;
14922 DECL_INTERFACE_KNOWN (decl1
) = 1;
14923 /* If this function is in an interface implemented in this file,
14924 make sure that the back end knows to emit this function
14926 if (!DECL_EXTERNAL (decl1
))
14927 mark_needed (decl1
);
14929 else if (finfo
->interface_unknown
&& finfo
->interface_only
14930 && honor_interface
)
14932 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
14933 interface, we will have both finfo->interface_unknown and
14934 finfo->interface_only set. In that case, we don't want to
14935 use the normal heuristics because someone will supply a
14936 #pragma implementation elsewhere, and deducing it here would
14937 produce a conflict. */
14938 comdat_linkage (decl1
);
14939 DECL_EXTERNAL (decl1
) = 0;
14940 DECL_INTERFACE_KNOWN (decl1
) = 1;
14941 DECL_DEFER_OUTPUT (decl1
) = 1;
14945 /* This is a definition, not a reference.
14946 So clear DECL_EXTERNAL, unless this is a GNU extern inline. */
14947 if (!GNU_INLINE_P (decl1
))
14948 DECL_EXTERNAL (decl1
) = 0;
14950 if ((DECL_DECLARED_INLINE_P (decl1
)
14951 || DECL_TEMPLATE_INSTANTIATION (decl1
))
14952 && ! DECL_INTERFACE_KNOWN (decl1
))
14953 DECL_DEFER_OUTPUT (decl1
) = 1;
14955 DECL_INTERFACE_KNOWN (decl1
) = 1;
14958 /* Determine the ELF visibility attribute for the function. We must not
14959 do this before calling "pushdecl", as we must allow "duplicate_decls"
14960 to merge any attributes appropriately. We also need to wait until
14962 if (!DECL_CLONED_FUNCTION_P (decl1
))
14963 determine_visibility (decl1
);
14965 if (!processing_template_decl
)
14966 maybe_instantiate_noexcept (decl1
);
14968 begin_scope (sk_function_parms
, decl1
);
14972 if (DECL_DESTRUCTOR_P (decl1
)
14973 || (DECL_CONSTRUCTOR_P (decl1
)
14974 && targetm
.cxx
.cdtor_returns_this ()))
14975 cdtor_label
= create_artificial_label (input_location
);
14977 start_fname_decls ();
14979 store_parm_decls (current_function_parms
);
14981 if (!processing_template_decl
14982 && (flag_lifetime_dse
> 1)
14983 && DECL_CONSTRUCTOR_P (decl1
)
14984 && !DECL_CLONED_FUNCTION_P (decl1
)
14985 /* Clobbering an empty base is harmful if it overlays real data. */
14986 && !is_empty_class (current_class_type
)
14987 /* We can't clobber safely for an implicitly-defined default constructor
14988 because part of the initialization might happen before we enter the
14989 constructor, via AGGR_INIT_ZERO_FIRST (c++/68006). */
14990 && !implicit_default_ctor_p (decl1
))
14991 finish_expr_stmt (build_clobber_this ());
14993 if (!processing_template_decl
14994 && DECL_CONSTRUCTOR_P (decl1
)
14995 && (flag_sanitize
& SANITIZE_VPTR
)
14996 && !DECL_CLONED_FUNCTION_P (decl1
)
14997 && !implicit_default_ctor_p (decl1
))
14998 cp_ubsan_maybe_initialize_vtbl_ptrs (current_class_ptr
);
15004 /* Like start_preparsed_function, except that instead of a
15005 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
15007 Returns true on success. If the DECLARATOR is not suitable
15008 for a function, we return false, which tells the parser to
15009 skip the entire function. */
15012 start_function (cp_decl_specifier_seq
*declspecs
,
15013 const cp_declarator
*declarator
,
15018 decl1
= grokdeclarator (declarator
, declspecs
, FUNCDEF
, 1, &attrs
);
15019 invoke_plugin_callbacks (PLUGIN_START_PARSE_FUNCTION
, decl1
);
15020 if (decl1
== error_mark_node
)
15022 /* If the declarator is not suitable for a function definition,
15023 cause a syntax error. */
15024 if (decl1
== NULL_TREE
|| TREE_CODE (decl1
) != FUNCTION_DECL
)
15026 error ("invalid function declaration");
15030 if (DECL_MAIN_P (decl1
))
15031 /* main must return int. grokfndecl should have corrected it
15032 (and issued a diagnostic) if the user got it wrong. */
15033 gcc_assert (same_type_p (TREE_TYPE (TREE_TYPE (decl1
)),
15034 integer_type_node
));
15036 return start_preparsed_function (decl1
, attrs
, /*flags=*/SF_DEFAULT
);
15039 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
15043 use_eh_spec_block (tree fn
)
15045 return (flag_exceptions
&& flag_enforce_eh_specs
15046 && !processing_template_decl
15047 && !type_throw_all_p (TREE_TYPE (fn
))
15048 /* We insert the EH_SPEC_BLOCK only in the original
15049 function; then, it is copied automatically to the
15051 && !DECL_CLONED_FUNCTION_P (fn
)
15052 /* Implicitly-generated constructors and destructors have
15053 exception specifications. However, those specifications
15054 are the union of the possible exceptions specified by the
15055 constructors/destructors for bases and members, so no
15056 unallowed exception will ever reach this function. By
15057 not creating the EH_SPEC_BLOCK we save a little memory,
15058 and we avoid spurious warnings about unreachable
15060 && !DECL_DEFAULTED_FN (fn
));
15063 /* Store the parameter declarations into the current function declaration.
15064 This is called after parsing the parameter declarations, before
15065 digesting the body of the function.
15067 Also install to binding contour return value identifier, if any. */
15070 store_parm_decls (tree current_function_parms
)
15072 tree fndecl
= current_function_decl
;
15075 /* This is a chain of any other decls that came in among the parm
15076 declarations. If a parm is declared with enum {foo, bar} x;
15077 then CONST_DECLs for foo and bar are put here. */
15078 tree nonparms
= NULL_TREE
;
15080 if (current_function_parms
)
15082 /* This case is when the function was defined with an ANSI prototype.
15083 The parms already have decls, so we need not do anything here
15084 except record them as in effect
15085 and complain if any redundant old-style parm decls were written. */
15087 tree specparms
= current_function_parms
;
15090 /* Must clear this because it might contain TYPE_DECLs declared
15092 current_binding_level
->names
= NULL
;
15094 /* If we're doing semantic analysis, then we'll call pushdecl
15095 for each of these. We must do them in reverse order so that
15096 they end in the correct forward order. */
15097 specparms
= nreverse (specparms
);
15099 for (parm
= specparms
; parm
; parm
= next
)
15101 next
= DECL_CHAIN (parm
);
15102 if (TREE_CODE (parm
) == PARM_DECL
)
15106 /* If we find an enum constant or a type tag,
15107 put it aside for the moment. */
15108 TREE_CHAIN (parm
) = NULL_TREE
;
15109 nonparms
= chainon (nonparms
, parm
);
15113 /* Get the decls in their original chain order and record in the
15114 function. This is all and only the PARM_DECLs that were
15115 pushed into scope by the loop above. */
15116 DECL_ARGUMENTS (fndecl
) = getdecls ();
15119 DECL_ARGUMENTS (fndecl
) = NULL_TREE
;
15121 /* Now store the final chain of decls for the arguments
15122 as the decl-chain of the current lexical scope.
15123 Put the enumerators in as well, at the front so that
15124 DECL_ARGUMENTS is not modified. */
15125 current_binding_level
->names
= chainon (nonparms
, DECL_ARGUMENTS (fndecl
));
15127 if (use_eh_spec_block (current_function_decl
))
15128 current_eh_spec_block
= begin_eh_spec_block ();
15132 /* We have finished doing semantic analysis on DECL, but have not yet
15133 generated RTL for its body. Save away our current state, so that
15134 when we want to generate RTL later we know what to do. */
15137 save_function_data (tree decl
)
15139 struct language_function
*f
;
15141 /* Save the language-specific per-function data so that we can
15142 get it back when we really expand this function. */
15143 gcc_assert (!DECL_PENDING_INLINE_P (decl
));
15146 f
= ggc_alloc
<language_function
> ();
15147 memcpy (f
, cp_function_chain
, sizeof (struct language_function
));
15148 DECL_SAVED_FUNCTION_DATA (decl
) = f
;
15150 /* Clear out the bits we don't need. */
15151 f
->base
.x_stmt_tree
.x_cur_stmt_list
= NULL
;
15152 f
->bindings
= NULL
;
15153 f
->x_local_names
= NULL
;
15154 f
->base
.local_typedefs
= NULL
;
15158 /* Set the return value of the constructor (if present). */
15161 finish_constructor_body (void)
15166 if (targetm
.cxx
.cdtor_returns_this ())
15168 /* Any return from a constructor will end up here. */
15169 add_stmt (build_stmt (input_location
, LABEL_EXPR
, cdtor_label
));
15171 val
= DECL_ARGUMENTS (current_function_decl
);
15172 val
= build2 (MODIFY_EXPR
, TREE_TYPE (val
),
15173 DECL_RESULT (current_function_decl
), val
);
15174 /* Return the address of the object. */
15175 exprstmt
= build_stmt (input_location
, RETURN_EXPR
, val
);
15176 add_stmt (exprstmt
);
15180 /* Do all the processing for the beginning of a destructor; set up the
15181 vtable pointers and cleanups for bases and members. */
15184 begin_destructor_body (void)
15186 tree compound_stmt
;
15188 /* If the CURRENT_CLASS_TYPE is incomplete, we will have already
15189 issued an error message. We still want to try to process the
15190 body of the function, but initialize_vtbl_ptrs will crash if
15191 TYPE_BINFO is NULL. */
15192 if (COMPLETE_TYPE_P (current_class_type
))
15194 compound_stmt
= begin_compound_stmt (0);
15195 /* Make all virtual function table pointers in non-virtual base
15196 classes point to CURRENT_CLASS_TYPE's virtual function
15198 initialize_vtbl_ptrs (current_class_ptr
);
15199 finish_compound_stmt (compound_stmt
);
15201 if (flag_lifetime_dse
15202 /* Clobbering an empty base is harmful if it overlays real data. */
15203 && !is_empty_class (current_class_type
))
15204 finish_decl_cleanup (NULL_TREE
, build_clobber_this ());
15206 /* And insert cleanups for our bases and members so that they
15207 will be properly destroyed if we throw. */
15208 push_base_cleanups ();
15212 /* At the end of every destructor we generate code to delete the object if
15213 necessary. Do that now. */
15216 finish_destructor_body (void)
15220 /* Any return from a destructor will end up here; that way all base
15221 and member cleanups will be run when the function returns. */
15222 add_stmt (build_stmt (input_location
, LABEL_EXPR
, cdtor_label
));
15224 if (targetm
.cxx
.cdtor_returns_this ())
15228 val
= DECL_ARGUMENTS (current_function_decl
);
15229 val
= build2 (MODIFY_EXPR
, TREE_TYPE (val
),
15230 DECL_RESULT (current_function_decl
), val
);
15231 /* Return the address of the object. */
15232 exprstmt
= build_stmt (input_location
, RETURN_EXPR
, val
);
15233 add_stmt (exprstmt
);
15237 /* Do the necessary processing for the beginning of a function body, which
15238 in this case includes member-initializers, but not the catch clauses of
15239 a function-try-block. Currently, this means opening a binding level
15240 for the member-initializers (in a ctor), member cleanups (in a dtor),
15241 and capture proxies (in a lambda operator()). */
15244 begin_function_body (void)
15248 if (! FUNCTION_NEEDS_BODY_BLOCK (current_function_decl
))
15251 if (processing_template_decl
)
15252 /* Do nothing now. */;
15254 /* Always keep the BLOCK node associated with the outermost pair of
15255 curly braces of a function. These are needed for correct
15256 operation of dwarfout.c. */
15257 keep_next_level (true);
15259 stmt
= begin_compound_stmt (BCS_FN_BODY
);
15261 if (processing_template_decl
)
15262 /* Do nothing now. */;
15263 else if (DECL_DESTRUCTOR_P (current_function_decl
))
15264 begin_destructor_body ();
15269 /* Do the processing for the end of a function body. Currently, this means
15270 closing out the cleanups for fully-constructed bases and members, and in
15271 the case of the destructor, deleting the object if desired. Again, this
15272 is only meaningful for [cd]tors, since they are the only functions where
15273 there is a significant distinction between the main body and any
15274 function catch clauses. Handling, say, main() return semantics here
15275 would be wrong, as flowing off the end of a function catch clause for
15276 main() would also need to return 0. */
15279 finish_function_body (tree compstmt
)
15281 if (compstmt
== NULL_TREE
)
15284 /* Close the block. */
15285 finish_compound_stmt (compstmt
);
15287 if (processing_template_decl
)
15288 /* Do nothing now. */;
15289 else if (DECL_CONSTRUCTOR_P (current_function_decl
))
15290 finish_constructor_body ();
15291 else if (DECL_DESTRUCTOR_P (current_function_decl
))
15292 finish_destructor_body ();
15295 /* Given a function, returns the BLOCK corresponding to the outermost level
15296 of curly braces, skipping the artificial block created for constructor
15300 outer_curly_brace_block (tree fndecl
)
15302 tree block
= DECL_INITIAL (fndecl
);
15303 if (BLOCK_OUTER_CURLY_BRACE_P (block
))
15305 block
= BLOCK_SUBBLOCKS (block
);
15306 if (BLOCK_OUTER_CURLY_BRACE_P (block
))
15308 block
= BLOCK_SUBBLOCKS (block
);
15309 gcc_assert (BLOCK_OUTER_CURLY_BRACE_P (block
));
15313 /* If FNDECL is a class's key method, add the class to the list of
15314 keyed classes that should be emitted. */
15317 record_key_method_defined (tree fndecl
)
15319 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fndecl
)
15320 && DECL_VIRTUAL_P (fndecl
)
15321 && !processing_template_decl
)
15323 tree fnclass
= DECL_CONTEXT (fndecl
);
15324 if (fndecl
== CLASSTYPE_KEY_METHOD (fnclass
))
15325 keyed_classes
= tree_cons (NULL_TREE
, fnclass
, keyed_classes
);
15329 /* Subroutine of finish_function.
15330 Save the body of constexpr functions for possible
15331 future compile time evaluation. */
15334 maybe_save_function_definition (tree fun
)
15336 if (!processing_template_decl
15337 && DECL_DECLARED_CONSTEXPR_P (fun
)
15338 && !cp_function_chain
->invalid_constexpr
15339 && !DECL_CLONED_FUNCTION_P (fun
))
15340 register_constexpr_fundef (fun
, DECL_SAVED_TREE (fun
));
15343 /* Finish up a function declaration and compile that function
15344 all the way to assembler language output. The free the storage
15345 for the function definition.
15347 FLAGS is a bitwise or of the following values:
15349 We just finished processing the body of an in-class inline
15350 function definition. (This processing will have taken place
15351 after the class definition is complete.) */
15354 finish_function (int flags
)
15356 tree fndecl
= current_function_decl
;
15357 tree fntype
, ctype
= NULL_TREE
;
15358 int inclass_inline
= (flags
& 2) != 0;
15360 /* When we get some parse errors, we can end up without a
15361 current_function_decl, so cope. */
15362 if (fndecl
== NULL_TREE
)
15363 return error_mark_node
;
15365 if (c_dialect_objc ())
15366 objc_finish_function ();
15368 record_key_method_defined (fndecl
);
15370 fntype
= TREE_TYPE (fndecl
);
15372 /* TREE_READONLY (fndecl) = 1;
15373 This caused &foo to be of type ptr-to-const-function
15374 which then got a warning when stored in a ptr-to-function variable. */
15376 gcc_assert (building_stmt_list_p ());
15377 /* The current function is being defined, so its DECL_INITIAL should
15378 be set, and unless there's a multiple definition, it should be
15379 error_mark_node. */
15380 gcc_assert (DECL_INITIAL (fndecl
) == error_mark_node
);
15382 /* For a cloned function, we've already got all the code we need;
15383 there's no need to add any extra bits. */
15384 if (!DECL_CLONED_FUNCTION_P (fndecl
))
15386 /* Make it so that `main' always returns 0 by default. */
15387 if (DECL_MAIN_P (current_function_decl
))
15388 finish_return_stmt (integer_zero_node
);
15390 if (use_eh_spec_block (current_function_decl
))
15391 finish_eh_spec_block (TYPE_RAISES_EXCEPTIONS
15392 (TREE_TYPE (current_function_decl
)),
15393 current_eh_spec_block
);
15396 /* If we're saving up tree structure, tie off the function now. */
15397 DECL_SAVED_TREE (fndecl
) = pop_stmt_list (DECL_SAVED_TREE (fndecl
));
15399 if (fn_contains_cilk_spawn_p (cfun
) && !processing_template_decl
)
15400 cfun
->cilk_frame_decl
= insert_cilk_frame (fndecl
);
15402 finish_fname_decls ();
15404 /* If this function can't throw any exceptions, remember that. */
15405 if (!processing_template_decl
15406 && !cp_function_chain
->can_throw
15407 && !flag_non_call_exceptions
15408 && !decl_replaceable_p (fndecl
))
15409 TREE_NOTHROW (fndecl
) = 1;
15411 /* This must come after expand_function_end because cleanups might
15412 have declarations (from inline functions) that need to go into
15413 this function's blocks. */
15415 /* If the current binding level isn't the outermost binding level
15416 for this function, either there is a bug, or we have experienced
15417 syntax errors and the statement tree is malformed. */
15418 if (current_binding_level
->kind
!= sk_function_parms
)
15420 /* Make sure we have already experienced errors. */
15421 gcc_assert (errorcount
);
15423 /* Throw away the broken statement tree and extra binding
15425 DECL_SAVED_TREE (fndecl
) = alloc_stmt_list ();
15427 while (current_binding_level
->kind
!= sk_function_parms
)
15429 if (current_binding_level
->kind
== sk_class
)
15430 pop_nested_class ();
15432 poplevel (0, 0, 0);
15435 poplevel (1, 0, 1);
15437 /* Statements should always be full-expressions at the outermost set
15438 of curly braces for a function. */
15439 gcc_assert (stmts_are_full_exprs_p ());
15441 /* If there are no return statements in a function with auto return type,
15442 the return type is void. But if the declared type is something like
15443 auto*, this is an error. */
15444 if (!processing_template_decl
&& FNDECL_USED_AUTO (fndecl
)
15445 && TREE_TYPE (fntype
) == current_function_auto_return_pattern
)
15447 if (!is_auto (current_function_auto_return_pattern
)
15448 && !current_function_returns_value
&& !current_function_returns_null
)
15450 error ("no return statements in function returning %qT",
15451 current_function_auto_return_pattern
);
15452 inform (input_location
, "only plain %<auto%> return type can be "
15453 "deduced to %<void%>");
15455 apply_deduced_return_type (fndecl
, void_type_node
);
15456 fntype
= TREE_TYPE (fndecl
);
15459 // If this is a concept, check that the definition is reasonable.
15460 if (DECL_DECLARED_CONCEPT_P (fndecl
))
15461 check_function_concept (fndecl
);
15463 /* Lambda closure members are implicitly constexpr if possible. */
15464 if (cxx_dialect
>= cxx1z
15465 && LAMBDA_TYPE_P (CP_DECL_CONTEXT (fndecl
))
15466 && (processing_template_decl
15467 || is_valid_constexpr_fn (fndecl
, /*complain*/false))
15468 && potential_constant_expression (DECL_SAVED_TREE (fndecl
)))
15469 DECL_DECLARED_CONSTEXPR_P (fndecl
) = true;
15471 /* Save constexpr function body before it gets munged by
15472 the NRV transformation. */
15473 maybe_save_function_definition (fndecl
);
15475 /* Invoke the pre-genericize plugin before we start munging things. */
15476 if (!processing_template_decl
)
15477 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE
, fndecl
);
15479 /* Perform delayed folding before NRV transformation. */
15480 if (!processing_template_decl
)
15481 cp_fold_function (fndecl
);
15483 /* Set up the named return value optimization, if we can. Candidate
15484 variables are selected in check_return_expr. */
15485 if (current_function_return_value
)
15487 tree r
= current_function_return_value
;
15490 if (r
!= error_mark_node
15491 /* This is only worth doing for fns that return in memory--and
15492 simpler, since we don't have to worry about promoted modes. */
15493 && aggregate_value_p (TREE_TYPE (TREE_TYPE (fndecl
)), fndecl
)
15494 /* Only allow this for variables declared in the outer scope of
15495 the function so we know that their lifetime always ends with a
15496 return; see g++.dg/opt/nrv6.C. We could be more flexible if
15497 we were to do this optimization in tree-ssa. */
15498 && (outer
= outer_curly_brace_block (fndecl
))
15499 && chain_member (r
, BLOCK_VARS (outer
)))
15500 finalize_nrv (&DECL_SAVED_TREE (fndecl
), r
, DECL_RESULT (fndecl
));
15502 current_function_return_value
= NULL_TREE
;
15505 /* Remember that we were in class scope. */
15506 if (current_class_name
)
15507 ctype
= current_class_type
;
15509 /* Must mark the RESULT_DECL as being in this function. */
15510 DECL_CONTEXT (DECL_RESULT (fndecl
)) = fndecl
;
15512 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
15513 to the FUNCTION_DECL node itself. */
15514 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl
)) = fndecl
;
15516 /* Save away current state, if appropriate. */
15517 if (!processing_template_decl
)
15518 save_function_data (fndecl
);
15520 /* Complain if there's just no return statement. */
15521 if (warn_return_type
15522 && !VOID_TYPE_P (TREE_TYPE (fntype
))
15523 && !dependent_type_p (TREE_TYPE (fntype
))
15524 && !current_function_returns_value
&& !current_function_returns_null
15525 /* Don't complain if we abort or throw. */
15526 && !current_function_returns_abnormally
15527 /* Don't complain if there's an infinite loop. */
15528 && !current_function_infinite_loop
15529 /* Don't complain if we are declared noreturn. */
15530 && !TREE_THIS_VOLATILE (fndecl
)
15531 && !DECL_NAME (DECL_RESULT (fndecl
))
15532 && !TREE_NO_WARNING (fndecl
)
15533 /* Structor return values (if any) are set by the compiler. */
15534 && !DECL_CONSTRUCTOR_P (fndecl
)
15535 && !DECL_DESTRUCTOR_P (fndecl
)
15536 && targetm
.warn_func_return (fndecl
))
15538 warning (OPT_Wreturn_type
,
15539 "no return statement in function returning non-void");
15540 TREE_NO_WARNING (fndecl
) = 1;
15543 /* Store the end of the function, so that we get good line number
15544 info for the epilogue. */
15545 cfun
->function_end_locus
= input_location
;
15547 /* Complain about parameters that are only set, but never otherwise used. */
15548 if (warn_unused_but_set_parameter
15549 && !processing_template_decl
15550 && errorcount
== unused_but_set_errorcount
15551 && !DECL_CLONED_FUNCTION_P (fndecl
))
15555 for (decl
= DECL_ARGUMENTS (fndecl
);
15557 decl
= DECL_CHAIN (decl
))
15558 if (TREE_USED (decl
)
15559 && TREE_CODE (decl
) == PARM_DECL
15560 && !DECL_READ_P (decl
)
15561 && DECL_NAME (decl
)
15562 && !DECL_ARTIFICIAL (decl
)
15563 && !TREE_NO_WARNING (decl
)
15564 && !DECL_IN_SYSTEM_HEADER (decl
)
15565 && TREE_TYPE (decl
) != error_mark_node
15566 && TREE_CODE (TREE_TYPE (decl
)) != REFERENCE_TYPE
15567 && (!CLASS_TYPE_P (TREE_TYPE (decl
))
15568 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl
))))
15569 warning_at (DECL_SOURCE_LOCATION (decl
),
15570 OPT_Wunused_but_set_parameter
,
15571 "parameter %qD set but not used", decl
);
15572 unused_but_set_errorcount
= errorcount
;
15575 /* Complain about locally defined typedefs that are not used in this
15577 maybe_warn_unused_local_typedefs ();
15579 /* Possibly warn about unused parameters. */
15580 if (warn_unused_parameter
15581 && !processing_template_decl
15582 && !DECL_CLONED_FUNCTION_P (fndecl
))
15583 do_warn_unused_parameter (fndecl
);
15585 /* Genericize before inlining. */
15586 if (!processing_template_decl
)
15588 struct language_function
*f
= DECL_SAVED_FUNCTION_DATA (fndecl
);
15589 cp_genericize (fndecl
);
15590 /* Clear out the bits we don't need. */
15591 f
->x_current_class_ptr
= NULL
;
15592 f
->x_current_class_ref
= NULL
;
15593 f
->x_eh_spec_block
= NULL
;
15594 f
->x_in_charge_parm
= NULL
;
15595 f
->x_vtt_parm
= NULL
;
15596 f
->x_return_value
= NULL
;
15597 f
->bindings
= NULL
;
15598 f
->extern_decl_map
= NULL
;
15599 f
->infinite_loops
= NULL
;
15601 /* Clear out the bits we don't need. */
15602 local_names
= NULL
;
15604 /* We're leaving the context of this function, so zap cfun. It's still in
15605 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
15607 current_function_decl
= NULL
;
15609 /* If this is an in-class inline definition, we may have to pop the
15610 bindings for the template parameters that we added in
15611 maybe_begin_member_template_processing when start_function was
15613 if (inclass_inline
)
15614 maybe_end_member_template_processing ();
15616 /* Leave the scope of the class. */
15618 pop_nested_class ();
15623 current_function_decl
= NULL_TREE
;
15625 invoke_plugin_callbacks (PLUGIN_FINISH_PARSE_FUNCTION
, fndecl
);
15629 /* Create the FUNCTION_DECL for a function definition.
15630 DECLSPECS and DECLARATOR are the parts of the declaration;
15631 they describe the return type and the name of the function,
15632 but twisted together in a fashion that parallels the syntax of C.
15634 This function creates a binding context for the function body
15635 as well as setting up the FUNCTION_DECL in current_function_decl.
15637 Returns a FUNCTION_DECL on success.
15639 If the DECLARATOR is not suitable for a function (it defines a datum
15640 instead), we return 0, which tells yyparse to report a parse error.
15642 May return void_type_node indicating that this method is actually
15643 a friend. See grokfield for more details.
15645 Came here with a `.pushlevel' .
15647 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
15648 CHANGES TO CODE IN `grokfield'. */
15651 grokmethod (cp_decl_specifier_seq
*declspecs
,
15652 const cp_declarator
*declarator
, tree attrlist
)
15654 tree fndecl
= grokdeclarator (declarator
, declspecs
, MEMFUNCDEF
, 0,
15657 if (fndecl
== error_mark_node
)
15658 return error_mark_node
;
15660 if (fndecl
== NULL
|| TREE_CODE (fndecl
) != FUNCTION_DECL
)
15662 error ("invalid member function declaration");
15663 return error_mark_node
;
15667 cplus_decl_attributes (&fndecl
, attrlist
, 0);
15669 /* Pass friends other than inline friend functions back. */
15670 if (fndecl
== void_type_node
)
15673 if (DECL_IN_AGGR_P (fndecl
))
15675 if (DECL_CLASS_SCOPE_P (fndecl
))
15676 error ("%qD is already defined in class %qT", fndecl
,
15677 DECL_CONTEXT (fndecl
));
15678 return error_mark_node
;
15681 check_template_shadow (fndecl
);
15683 if (TREE_PUBLIC (fndecl
))
15684 DECL_COMDAT (fndecl
) = 1;
15685 DECL_DECLARED_INLINE_P (fndecl
) = 1;
15686 DECL_NO_INLINE_WARNING_P (fndecl
) = 1;
15688 /* We process method specializations in finish_struct_1. */
15689 if (processing_template_decl
&& !DECL_TEMPLATE_SPECIALIZATION (fndecl
))
15691 fndecl
= push_template_decl (fndecl
);
15692 if (fndecl
== error_mark_node
)
15696 if (! DECL_FRIEND_P (fndecl
))
15698 if (DECL_CHAIN (fndecl
))
15700 fndecl
= copy_node (fndecl
);
15701 TREE_CHAIN (fndecl
) = NULL_TREE
;
15705 cp_finish_decl (fndecl
, NULL_TREE
, false, NULL_TREE
, 0);
15707 DECL_IN_AGGR_P (fndecl
) = 1;
15712 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
15713 we can lay it out later, when and if its type becomes complete.
15715 Also handle constexpr variables where the initializer involves
15716 an unlowered PTRMEM_CST because the class isn't complete yet. */
15719 maybe_register_incomplete_var (tree var
)
15721 gcc_assert (VAR_P (var
));
15723 /* Keep track of variables with incomplete types. */
15724 if (!processing_template_decl
&& TREE_TYPE (var
) != error_mark_node
15725 && DECL_EXTERNAL (var
))
15727 tree inner_type
= TREE_TYPE (var
);
15729 while (TREE_CODE (inner_type
) == ARRAY_TYPE
)
15730 inner_type
= TREE_TYPE (inner_type
);
15731 inner_type
= TYPE_MAIN_VARIANT (inner_type
);
15733 if ((!COMPLETE_TYPE_P (inner_type
) && CLASS_TYPE_P (inner_type
))
15734 /* RTTI TD entries are created while defining the type_info. */
15735 || (TYPE_LANG_SPECIFIC (inner_type
)
15736 && TYPE_BEING_DEFINED (inner_type
)))
15738 incomplete_var iv
= {var
, inner_type
};
15739 vec_safe_push (incomplete_vars
, iv
);
15741 else if (!(DECL_LANG_SPECIFIC (var
) && DECL_TEMPLATE_INFO (var
))
15742 && decl_constant_var_p (var
)
15743 && (TYPE_PTRMEM_P (inner_type
) || CLASS_TYPE_P (inner_type
)))
15745 /* When the outermost open class is complete we can resolve any
15746 pointers-to-members. */
15747 tree context
= outermost_open_class ();
15748 incomplete_var iv
= {var
, context
};
15749 vec_safe_push (incomplete_vars
, iv
);
15754 /* Called when a class type (given by TYPE) is defined. If there are
15755 any existing VAR_DECLs whose type has been completed by this
15756 declaration, update them now. */
15759 complete_vars (tree type
)
15762 incomplete_var
*iv
;
15764 for (ix
= 0; vec_safe_iterate (incomplete_vars
, ix
, &iv
); )
15766 if (same_type_p (type
, iv
->incomplete_type
))
15768 tree var
= iv
->decl
;
15769 tree type
= TREE_TYPE (var
);
15771 if (type
!= error_mark_node
15772 && (TYPE_MAIN_VARIANT (strip_array_types (type
))
15773 == iv
->incomplete_type
))
15775 /* Complete the type of the variable. The VAR_DECL itself
15776 will be laid out in expand_expr. */
15777 complete_type (type
);
15778 cp_apply_type_quals_to_decl (cp_type_quals (type
), var
);
15781 /* Remove this entry from the list. */
15782 incomplete_vars
->unordered_remove (ix
);
15788 /* Check for pending declarations which may have abstract type. */
15789 complete_type_check_abstract (type
);
15792 /* If DECL is of a type which needs a cleanup, build and return an
15793 expression to perform that cleanup here. Return NULL_TREE if no
15794 cleanup need be done. DECL can also be a _REF when called from
15795 split_nonconstant_init_1. */
15798 cxx_maybe_build_cleanup (tree decl
, tsubst_flags_t complain
)
15804 /* Assume no cleanup is required. */
15805 cleanup
= NULL_TREE
;
15807 if (error_operand_p (decl
))
15810 /* Handle "__attribute__((cleanup))". We run the cleanup function
15811 before the destructor since the destructor is what actually
15812 terminates the lifetime of the object. */
15814 attr
= lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl
));
15823 /* Get the name specified by the user for the cleanup function. */
15824 id
= TREE_VALUE (TREE_VALUE (attr
));
15825 /* Look up the name to find the cleanup function to call. It is
15826 important to use lookup_name here because that is what is
15827 used in c-common.c:handle_cleanup_attribute when performing
15828 initial checks on the attribute. Note that those checks
15829 include ensuring that the function found is not an overloaded
15830 function, or an object with an overloaded call operator,
15831 etc.; we can rely on the fact that the function found is an
15832 ordinary FUNCTION_DECL. */
15833 fn
= lookup_name (id
);
15834 arg
= build_address (decl
);
15835 if (!mark_used (decl
, complain
) && !(complain
& tf_error
))
15836 return error_mark_node
;
15837 cleanup
= cp_build_function_call_nary (fn
, complain
, arg
, NULL_TREE
);
15838 if (cleanup
== error_mark_node
)
15839 return error_mark_node
;
15841 /* Handle ordinary C++ destructors. */
15842 type
= TREE_TYPE (decl
);
15843 if (type_build_dtor_call (type
))
15845 int flags
= LOOKUP_NORMAL
|LOOKUP_NONVIRTUAL
|LOOKUP_DESTRUCTOR
;
15849 if (TREE_CODE (type
) == ARRAY_TYPE
)
15852 addr
= build_address (decl
);
15854 call
= build_delete (TREE_TYPE (addr
), addr
,
15855 sfk_complete_destructor
, flags
, 0, complain
);
15856 if (call
== error_mark_node
)
15857 cleanup
= error_mark_node
;
15858 else if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type
))
15859 /* Discard the call. */;
15861 cleanup
= cp_build_compound_expr (cleanup
, call
, complain
);
15866 /* build_delete sets the location of the destructor call to the
15867 current location, even though the destructor is going to be
15868 called later, at the end of the current scope. This can lead to
15869 a "jumpy" behavior for users of debuggers when they step around
15870 the end of the block. So let's unset the location of the
15871 destructor call instead. */
15872 protected_set_expr_location (cleanup
, UNKNOWN_LOCATION
);
15876 && !lookup_attribute ("warn_unused", TYPE_ATTRIBUTES (TREE_TYPE (decl
)))
15877 /* Treat objects with destructors as used; the destructor may do
15878 something substantive. */
15879 && !mark_used (decl
, complain
) && !(complain
& tf_error
))
15880 return error_mark_node
;
15886 /* Return the FUNCTION_TYPE that corresponds to MEMFNTYPE, which can be a
15887 FUNCTION_DECL, METHOD_TYPE, FUNCTION_TYPE, pointer or reference to
15888 METHOD_TYPE or FUNCTION_TYPE, or pointer to member function. */
15891 static_fn_type (tree memfntype
)
15896 if (TYPE_PTRMEMFUNC_P (memfntype
))
15897 memfntype
= TYPE_PTRMEMFUNC_FN_TYPE (memfntype
);
15898 if (POINTER_TYPE_P (memfntype
)
15899 || TREE_CODE (memfntype
) == FUNCTION_DECL
)
15900 memfntype
= TREE_TYPE (memfntype
);
15901 if (TREE_CODE (memfntype
) == FUNCTION_TYPE
)
15903 gcc_assert (TREE_CODE (memfntype
) == METHOD_TYPE
);
15904 args
= TYPE_ARG_TYPES (memfntype
);
15905 cp_ref_qualifier rqual
= type_memfn_rqual (memfntype
);
15906 fntype
= build_function_type (TREE_TYPE (memfntype
), TREE_CHAIN (args
));
15907 fntype
= apply_memfn_quals (fntype
, type_memfn_quals (memfntype
), rqual
);
15908 fntype
= (cp_build_type_attribute_variant
15909 (fntype
, TYPE_ATTRIBUTES (memfntype
)));
15910 fntype
= (build_exception_variant
15911 (fntype
, TYPE_RAISES_EXCEPTIONS (memfntype
)));
15912 if (TYPE_HAS_LATE_RETURN_TYPE (memfntype
))
15913 TYPE_HAS_LATE_RETURN_TYPE (fntype
) = 1;
15917 /* DECL was originally constructed as a non-static member function,
15918 but turned out to be static. Update it accordingly. */
15921 revert_static_member_fn (tree decl
)
15923 tree stype
= static_fn_type (decl
);
15924 cp_cv_quals quals
= type_memfn_quals (stype
);
15925 cp_ref_qualifier rqual
= type_memfn_rqual (stype
);
15927 if (quals
!= TYPE_UNQUALIFIED
|| rqual
!= REF_QUAL_NONE
)
15928 stype
= apply_memfn_quals (stype
, TYPE_UNQUALIFIED
, REF_QUAL_NONE
);
15930 TREE_TYPE (decl
) = stype
;
15932 if (DECL_ARGUMENTS (decl
))
15933 DECL_ARGUMENTS (decl
) = DECL_CHAIN (DECL_ARGUMENTS (decl
));
15934 DECL_STATIC_FUNCTION_P (decl
) = 1;
15937 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
15938 one of the language-independent trees. */
15940 enum cp_tree_node_structure_enum
15941 cp_tree_node_structure (union lang_tree_node
* t
)
15943 switch (TREE_CODE (&t
->generic
))
15945 case DEFAULT_ARG
: return TS_CP_DEFAULT_ARG
;
15946 case DEFERRED_NOEXCEPT
: return TS_CP_DEFERRED_NOEXCEPT
;
15947 case IDENTIFIER_NODE
: return TS_CP_IDENTIFIER
;
15948 case OVERLOAD
: return TS_CP_OVERLOAD
;
15949 case TEMPLATE_PARM_INDEX
: return TS_CP_TPI
;
15950 case PTRMEM_CST
: return TS_CP_PTRMEM
;
15951 case BASELINK
: return TS_CP_BASELINK
;
15952 case TEMPLATE_DECL
: return TS_CP_TEMPLATE_DECL
;
15953 case STATIC_ASSERT
: return TS_CP_STATIC_ASSERT
;
15954 case ARGUMENT_PACK_SELECT
: return TS_CP_ARGUMENT_PACK_SELECT
;
15955 case TRAIT_EXPR
: return TS_CP_TRAIT_EXPR
;
15956 case LAMBDA_EXPR
: return TS_CP_LAMBDA_EXPR
;
15957 case TEMPLATE_INFO
: return TS_CP_TEMPLATE_INFO
;
15958 case CONSTRAINT_INFO
: return TS_CP_CONSTRAINT_INFO
;
15959 case USERDEF_LITERAL
: return TS_CP_USERDEF_LITERAL
;
15960 default: return TS_CP_GENERIC
;
15964 /* Build the void_list_node (void_type_node having been created). */
15966 build_void_list_node (void)
15968 tree t
= build_tree_list (NULL_TREE
, void_type_node
);
15973 cp_missing_noreturn_ok_p (tree decl
)
15975 /* A missing noreturn is ok for the `main' function. */
15976 return DECL_MAIN_P (decl
);
15979 /* Return the decl used to identify the COMDAT group into which DECL should
15983 cxx_comdat_group (tree decl
)
15985 /* Virtual tables, construction virtual tables, and virtual table
15986 tables all go in a single COMDAT group, named after the primary
15988 if (VAR_P (decl
) && DECL_VTABLE_OR_VTT_P (decl
))
15989 decl
= CLASSTYPE_VTABLES (DECL_CONTEXT (decl
));
15990 /* For all other DECLs, the COMDAT group is the mangled name of the
15991 declaration itself. */
15994 while (DECL_THUNK_P (decl
))
15996 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
15997 into the same section as the target function. In that case
15998 we must return target's name. */
15999 tree target
= THUNK_TARGET (decl
);
16000 if (TARGET_USE_LOCAL_THUNK_ALIAS_P (target
)
16001 && DECL_SECTION_NAME (target
) != NULL
16002 && DECL_ONE_ONLY (target
))
16012 /* Returns the return type for FN as written by the user, which may include
16013 a placeholder for a deduced return type. */
16016 fndecl_declared_return_type (tree fn
)
16018 fn
= STRIP_TEMPLATE (fn
);
16019 if (FNDECL_USED_AUTO (fn
))
16021 struct language_function
*f
= NULL
;
16022 if (DECL_STRUCT_FUNCTION (fn
))
16023 f
= DECL_STRUCT_FUNCTION (fn
)->language
;
16025 f
= DECL_SAVED_FUNCTION_DATA (fn
);
16026 return f
->x_auto_return_pattern
;
16028 return TREE_TYPE (TREE_TYPE (fn
));
16031 /* Returns true iff DECL was declared with an auto return type and it has
16032 not yet been deduced to a real type. */
16035 undeduced_auto_decl (tree decl
)
16037 if (cxx_dialect
< cxx14
)
16039 return type_uses_auto (TREE_TYPE (decl
));
16042 /* Complain if DECL has an undeduced return type. */
16045 require_deduced_type (tree decl
)
16047 if (undeduced_auto_decl (decl
))
16048 error ("use of %qD before deduction of %<auto%>", decl
);
16051 #include "gt-cp-decl.h"