1 /* Process declarations and variables for C++ compiler.
2 Copyright (C) 1988-2015 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"
35 #include "tree-hasher.h"
36 #include "stringpool.h"
37 #include "stor-layout.h"
43 #include "tree-iterator.h"
44 #include "tree-inline.h"
50 #include "c-family/c-common.h"
51 #include "c-family/c-objc.h"
52 #include "c-family/c-pragma.h"
53 #include "c-family/c-target.h"
54 #include "c-family/c-ubsan.h"
55 #include "diagnostic.h"
59 #include "splay-tree.h"
61 #include "hard-reg-set.h"
67 /* Possible cases of bad specifiers type used by bad_specifiers. */
69 BSP_VAR
, /* variable */
70 BSP_PARM
, /* parameter */
75 static const char *redeclaration_error_message (tree
, tree
);
77 static int decl_jump_unsafe (tree
);
78 static void require_complete_types_for_parms (tree
);
79 static int ambi_op_p (enum tree_code
);
80 static int unary_op_p (enum tree_code
);
81 static void push_local_name (tree
);
82 static tree
grok_reference_init (tree
, tree
, tree
, int);
83 static tree
grokvardecl (tree
, tree
, tree
, const cp_decl_specifier_seq
*,
85 static int check_static_variable_definition (tree
, tree
);
86 static void record_unknown_type (tree
, const char *);
87 static tree
builtin_function_1 (tree
, tree
, bool);
88 static int member_function_or_else (tree
, tree
, enum overload_flags
);
89 static void bad_specifiers (tree
, enum bad_spec_place
, int, int, int, int,
91 static void check_for_uninitialized_const_var (tree
);
92 static tree
local_variable_p_walkfn (tree
*, int *, void *);
93 static tree
record_builtin_java_type (const char *, int);
94 static const char *tag_name (enum tag_types
);
95 static tree
lookup_and_check_tag (enum tag_types
, tree
, tag_scope
, bool);
96 static int walk_namespaces_r (tree
, walk_namespaces_fn
, void *);
97 static void maybe_deduce_size_from_array_init (tree
, tree
);
98 static void layout_var_decl (tree
);
99 static tree
check_initializer (tree
, tree
, int, vec
<tree
, va_gc
> **);
100 static void make_rtl_for_nonlocal_decl (tree
, tree
, const char *);
101 static void save_function_data (tree
);
102 static void copy_type_enum (tree
, tree
);
103 static void check_function_type (tree
, tree
);
104 static void finish_constructor_body (void);
105 static void begin_destructor_body (void);
106 static void finish_destructor_body (void);
107 static void record_key_method_defined (tree
);
108 static tree
create_array_type_for_decl (tree
, tree
, tree
);
109 static tree
get_atexit_node (void);
110 static tree
get_dso_handle_node (void);
111 static tree
start_cleanup_fn (void);
112 static void end_cleanup_fn (void);
113 static tree
cp_make_fname_decl (location_t
, tree
, int);
114 static void initialize_predefined_identifiers (void);
115 static tree check_special_function_return_type
116 (special_function_kind
, tree
, tree
, int, const location_t
*);
117 static tree
push_cp_library_fn (enum tree_code
, tree
, int);
118 static tree
build_cp_library_fn (tree
, enum tree_code
, tree
, int);
119 static void store_parm_decls (tree
);
120 static void initialize_local_var (tree
, tree
);
121 static void expand_static_init (tree
, tree
);
123 /* The following symbols are subsumed in the cp_global_trees array, and
124 listed here individually for documentation purposes.
127 tree wchar_decl_node;
129 tree vtable_entry_type;
130 tree delta_type_node;
131 tree __t_desc_type_node;
133 tree class_type_node;
134 tree unknown_type_node;
136 Array type `vtable_entry_type[]'
139 tree vtbl_ptr_type_node;
146 A FUNCTION_DECL which can call `abort'. Not necessarily the
147 one that the user will declare, but sufficient to be called
148 by routines that want to abort the program.
153 tree type_info_type_node, tinfo_decl_id, tinfo_decl_type;
154 tree tinfo_var_id; */
156 tree cp_global_trees
[CPTI_MAX
];
158 /* Indicates that there is a type value in some namespace, although
159 that is not necessarily in scope at the moment. */
161 tree global_type_node
;
163 /* The node that holds the "name" of the global scope. */
164 tree global_scope_name
;
166 #define local_names cp_function_chain->x_local_names
168 /* A list of objects which have constructors or destructors
169 which reside in the global scope. The decl is stored in
170 the TREE_VALUE slot and the initializer is stored
171 in the TREE_PURPOSE slot. */
172 tree static_aggregates
;
174 /* Like static_aggregates, but for thread_local variables. */
179 /* A node for the integer constant 2. */
181 tree integer_two_node
;
183 /* Used only for jumps to as-yet undefined labels, since jumps to
184 defined labels can have their validity checked immediately. */
186 struct GTY((chain_next ("%h.next"))) named_label_use_entry
{
187 struct named_label_use_entry
*next
;
188 /* The binding level to which this entry is *currently* attached.
189 This is initially the binding level in which the goto appeared,
190 but is modified as scopes are closed. */
191 cp_binding_level
*binding_level
;
192 /* The head of the names list that was current when the goto appeared,
193 or the inner scope popped. These are the decls that will *not* be
194 skipped when jumping to the label. */
196 /* The location of the goto, for error reporting. */
197 location_t o_goto_locus
;
198 /* True if an OpenMP structured block scope has been closed since
199 the goto appeared. This means that the branch from the label will
200 illegally exit an OpenMP scope. */
204 /* A list of all LABEL_DECLs in the function that have names. Here so
205 we can clear out their names' definitions at the end of the
206 function, and so we can check the validity of jumps to these labels. */
208 struct GTY((for_user
)) named_label_entry
{
209 /* The decl itself. */
212 /* The binding level to which the label is *currently* attached.
213 This is initially set to the binding level in which the label
214 is defined, but is modified as scopes are closed. */
215 cp_binding_level
*binding_level
;
216 /* The head of the names list that was current when the label was
217 defined, or the inner scope popped. These are the decls that will
218 be skipped when jumping to the label. */
220 /* A vector of all decls from all binding levels that would be
221 crossed by a backward branch to the label. */
222 vec
<tree
, va_gc
> *bad_decls
;
224 /* A list of uses of the label, before the label is defined. */
225 struct named_label_use_entry
*uses
;
227 /* The following bits are set after the label is defined, and are
228 updated as scopes are popped. They indicate that a backward jump
229 to the label will illegally enter a scope of the given flavor. */
235 #define named_labels cp_function_chain->x_named_labels
237 /* The number of function bodies which we are currently processing.
238 (Zero if we are at namespace scope, one inside the body of a
239 function, two inside the body of a function in a local class, etc.) */
242 /* To avoid unwanted recursion, finish_function defers all mark_used calls
243 encountered during its execution until it finishes. */
244 bool defer_mark_used_calls
;
245 vec
<tree
, va_gc
> *deferred_mark_used_calls
;
247 /* States indicating how grokdeclarator() should handle declspecs marked
248 with __attribute__((deprecated)). An object declared as
249 __attribute__((deprecated)) suppresses warnings of uses of other
251 enum deprecated_states deprecated_state
= DEPRECATED_NORMAL
;
254 /* A list of VAR_DECLs whose type was incomplete at the time the
255 variable was declared. */
257 struct GTY(()) incomplete_var
{
259 tree incomplete_type
;
263 static GTY(()) vec
<incomplete_var
, va_gc
> *incomplete_vars
;
265 /* Returns the kind of template specialization we are currently
266 processing, given that it's declaration contained N_CLASS_SCOPES
267 explicit scope qualifications. */
270 current_tmpl_spec_kind (int n_class_scopes
)
272 int n_template_parm_scopes
= 0;
273 int seen_specialization_p
= 0;
274 int innermost_specialization_p
= 0;
277 /* Scan through the template parameter scopes. */
278 for (b
= current_binding_level
;
279 b
->kind
== sk_template_parms
;
282 /* If we see a specialization scope inside a parameter scope,
283 then something is wrong. That corresponds to a declaration
286 template <class T> template <> ...
288 which is always invalid since [temp.expl.spec] forbids the
289 specialization of a class member template if the enclosing
290 class templates are not explicitly specialized as well. */
291 if (b
->explicit_spec_p
)
293 if (n_template_parm_scopes
== 0)
294 innermost_specialization_p
= 1;
296 seen_specialization_p
= 1;
298 else if (seen_specialization_p
== 1)
299 return tsk_invalid_member_spec
;
301 ++n_template_parm_scopes
;
304 /* Handle explicit instantiations. */
305 if (processing_explicit_instantiation
)
307 if (n_template_parm_scopes
!= 0)
308 /* We've seen a template parameter list during an explicit
309 instantiation. For example:
311 template <class T> template void f(int);
313 This is erroneous. */
314 return tsk_invalid_expl_inst
;
316 return tsk_expl_inst
;
319 if (n_template_parm_scopes
< n_class_scopes
)
320 /* We've not seen enough template headers to match all the
321 specialized classes present. For example:
323 template <class T> void R<T>::S<T>::f(int);
325 This is invalid; there needs to be one set of template
326 parameters for each class. */
327 return tsk_insufficient_parms
;
328 else if (n_template_parm_scopes
== n_class_scopes
)
329 /* We're processing a non-template declaration (even though it may
330 be a member of a template class.) For example:
332 template <class T> void S<T>::f(int);
334 The `class T' matches the `S<T>', leaving no template headers
335 corresponding to the `f'. */
337 else if (n_template_parm_scopes
> n_class_scopes
+ 1)
338 /* We've got too many template headers. For example:
340 template <> template <class T> void f (T);
342 There need to be more enclosing classes. */
343 return tsk_excessive_parms
;
345 /* This must be a template. It's of the form:
347 template <class T> template <class U> void S<T>::f(U);
349 This is a specialization if the innermost level was a
350 specialization; otherwise it's just a definition of the
352 return innermost_specialization_p
? tsk_expl_spec
: tsk_template
;
355 /* Exit the current scope. */
363 /* When a label goes out of scope, check to see if that label was used
364 in a valid manner, and issue any appropriate warnings or errors. */
367 pop_label (tree label
, tree old_value
)
369 if (!processing_template_decl
)
371 if (DECL_INITIAL (label
) == NULL_TREE
)
375 error ("label %q+D used but not defined", label
);
376 location
= input_location
;
377 /* FIXME want (LOCATION_FILE (input_location), (line)0) */
378 /* Avoid crashing later. */
379 define_label (location
, DECL_NAME (label
));
382 warn_for_unused_label (label
);
385 SET_IDENTIFIER_LABEL_VALUE (DECL_NAME (label
), old_value
);
388 /* At the end of a function, all labels declared within the function
389 go out of scope. BLOCK is the top-level block for the
393 pop_labels_1 (named_label_entry
**slot
, tree block
)
395 struct named_label_entry
*ent
= *slot
;
397 pop_label (ent
->label_decl
, NULL_TREE
);
399 /* Put the labels into the "variables" of the top-level block,
400 so debugger can see them. */
401 DECL_CHAIN (ent
->label_decl
) = BLOCK_VARS (block
);
402 BLOCK_VARS (block
) = ent
->label_decl
;
404 named_labels
->clear_slot (slot
);
410 pop_labels (tree block
)
414 named_labels
->traverse
<tree
, pop_labels_1
> (block
);
419 /* At the end of a block with local labels, restore the outer definition. */
422 pop_local_label (tree label
, tree old_value
)
424 struct named_label_entry dummy
;
426 pop_label (label
, old_value
);
428 dummy
.label_decl
= label
;
429 named_label_entry
**slot
= named_labels
->find_slot (&dummy
, NO_INSERT
);
430 named_labels
->clear_slot (slot
);
433 /* The following two routines are used to interface to Objective-C++.
434 The binding level is purposely treated as an opaque type. */
437 objc_get_current_scope (void)
439 return current_binding_level
;
442 /* The following routine is used by the NeXT-style SJLJ exceptions;
443 variables get marked 'volatile' so as to not be clobbered by
444 _setjmp()/_longjmp() calls. All variables in the current scope,
445 as well as parent scopes up to (but not including) ENCLOSING_BLK
446 shall be thusly marked. */
449 objc_mark_locals_volatile (void *enclosing_blk
)
451 cp_binding_level
*scope
;
453 for (scope
= current_binding_level
;
454 scope
&& scope
!= enclosing_blk
;
455 scope
= scope
->level_chain
)
459 for (decl
= scope
->names
; decl
; decl
= TREE_CHAIN (decl
))
460 objc_volatilize_decl (decl
);
462 /* Do not climb up past the current function. */
463 if (scope
->kind
== sk_function_parms
)
468 /* Update data for defined and undefined labels when leaving a scope. */
471 poplevel_named_label_1 (named_label_entry
**slot
, cp_binding_level
*bl
)
473 named_label_entry
*ent
= *slot
;
474 cp_binding_level
*obl
= bl
->level_chain
;
476 if (ent
->binding_level
== bl
)
480 /* ENT->NAMES_IN_SCOPE may contain a mixture of DECLs and
481 TREE_LISTs representing OVERLOADs, so be careful. */
482 for (decl
= ent
->names_in_scope
; decl
; decl
= (DECL_P (decl
)
484 : TREE_CHAIN (decl
)))
485 if (decl_jump_unsafe (decl
))
486 vec_safe_push (ent
->bad_decls
, decl
);
488 ent
->binding_level
= obl
;
489 ent
->names_in_scope
= obl
->names
;
493 ent
->in_try_scope
= true;
496 ent
->in_catch_scope
= true;
499 ent
->in_omp_scope
= true;
507 struct named_label_use_entry
*use
;
509 for (use
= ent
->uses
; use
; use
= use
->next
)
510 if (use
->binding_level
== bl
)
512 use
->binding_level
= obl
;
513 use
->names_in_scope
= obl
->names
;
514 if (bl
->kind
== sk_omp
)
515 use
->in_omp_scope
= true;
522 /* Saved errorcount to avoid -Wunused-but-set-{parameter,variable} warnings
523 when errors were reported, except for -Werror-unused-but-set-*. */
524 static int unused_but_set_errorcount
;
526 /* Exit a binding level.
527 Pop the level off, and restore the state of the identifier-decl mappings
528 that were in effect when this level was entered.
530 If KEEP == 1, this level had explicit declarations, so
531 and create a "block" (a BLOCK node) for the level
532 to record its declarations and subblocks for symbol table output.
534 If FUNCTIONBODY is nonzero, this level is the body of a function,
535 so create a block as if KEEP were set and also clear out all
538 If REVERSE is nonzero, reverse the order of decls before putting
539 them into the BLOCK. */
542 poplevel (int keep
, int reverse
, int functionbody
)
545 /* The chain of decls was accumulated in reverse order.
546 Put it into forward order, just for cleanliness. */
551 int leaving_for_scope
;
554 cp_label_binding
*label_bind
;
556 bool subtime
= timevar_cond_start (TV_NAME_LOOKUP
);
561 gcc_assert (current_binding_level
->kind
!= sk_class
);
563 if (current_binding_level
->kind
== sk_cleanup
)
565 subblocks
= functionbody
>= 0 ? current_binding_level
->blocks
: 0;
567 gcc_assert (!vec_safe_length (current_binding_level
->class_shadowed
));
569 /* We used to use KEEP == 2 to indicate that the new block should go
570 at the beginning of the list of blocks at this binding level,
571 rather than the end. This hack is no longer used. */
572 gcc_assert (keep
== 0 || keep
== 1);
574 if (current_binding_level
->keep
)
577 /* Any uses of undefined labels, and any defined labels, now operate
578 under constraints of next binding contour. */
579 if (cfun
&& !functionbody
&& named_labels
)
580 named_labels
->traverse
<cp_binding_level
*, poplevel_named_label_1
>
581 (current_binding_level
);
583 /* Get the decls in the order they were written.
584 Usually current_binding_level->names is in reverse order.
585 But parameter decls were previously put in forward order. */
588 current_binding_level
->names
589 = decls
= nreverse (current_binding_level
->names
);
591 decls
= current_binding_level
->names
;
593 /* If there were any declarations or structure tags in that level,
594 or if this level is a function body,
595 create a BLOCK to record them for the life of this function. */
597 /* Avoid function body block if possible. */
598 if (functionbody
&& subblocks
&& BLOCK_CHAIN (subblocks
) == NULL_TREE
)
600 else if (keep
== 1 || functionbody
)
601 block
= make_node (BLOCK
);
602 if (block
!= NULL_TREE
)
604 BLOCK_VARS (block
) = decls
;
605 BLOCK_SUBBLOCKS (block
) = subblocks
;
608 /* In each subblock, record that this is its superior. */
610 for (link
= subblocks
; link
; link
= BLOCK_CHAIN (link
))
611 BLOCK_SUPERCONTEXT (link
) = block
;
613 /* We still support the old for-scope rules, whereby the variables
614 in a for-init statement were in scope after the for-statement
615 ended. We only use the new rules if flag_new_for_scope is
618 = current_binding_level
->kind
== sk_for
&& flag_new_for_scope
== 1;
620 /* Before we remove the declarations first check for unused variables. */
621 if ((warn_unused_variable
|| warn_unused_but_set_variable
)
622 && current_binding_level
->kind
!= sk_template_parms
623 && !processing_template_decl
)
624 for (tree d
= getdecls (); d
; d
= TREE_CHAIN (d
))
626 /* There are cases where D itself is a TREE_LIST. See in
627 push_local_binding where the list of decls returned by
628 getdecls is built. */
629 decl
= TREE_CODE (d
) == TREE_LIST
? TREE_VALUE (d
) : d
;
630 tree type
= TREE_TYPE (decl
);
632 && (! TREE_USED (decl
) || !DECL_READ_P (decl
))
633 && ! DECL_IN_SYSTEM_HEADER (decl
)
634 && DECL_NAME (decl
) && ! DECL_ARTIFICIAL (decl
)
635 && type
!= error_mark_node
636 && (!CLASS_TYPE_P (type
)
637 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type
)
638 || lookup_attribute ("warn_unused",
639 TYPE_ATTRIBUTES (TREE_TYPE (decl
)))))
641 if (! TREE_USED (decl
))
642 warning_at (DECL_SOURCE_LOCATION (decl
),
643 OPT_Wunused_variable
, "unused variable %qD", decl
);
644 else if (DECL_CONTEXT (decl
) == current_function_decl
645 // For -Wunused-but-set-variable leave references alone.
646 && TREE_CODE (TREE_TYPE (decl
)) != REFERENCE_TYPE
647 && errorcount
== unused_but_set_errorcount
)
649 warning_at (DECL_SOURCE_LOCATION (decl
),
650 OPT_Wunused_but_set_variable
,
651 "variable %qD set but not used", decl
);
652 unused_but_set_errorcount
= errorcount
;
657 /* Remove declarations for all the DECLs in this level. */
658 for (link
= decls
; link
; link
= TREE_CHAIN (link
))
660 if (leaving_for_scope
&& VAR_P (link
)
661 /* It's hard to make this ARM compatibility hack play nicely with
662 lambdas, and it really isn't necessary in C++11 mode. */
663 && cxx_dialect
< cxx11
666 tree name
= DECL_NAME (link
);
670 ob
= outer_binding (name
,
671 IDENTIFIER_BINDING (name
),
674 ns_binding
= IDENTIFIER_NAMESPACE_VALUE (name
);
676 ns_binding
= NULL_TREE
;
678 if (ob
&& ob
->scope
== current_binding_level
->level_chain
)
679 /* We have something like:
684 and we are leaving the `for' scope. There's no reason to
685 keep the binding of the inner `i' in this case. */
686 pop_binding (name
, link
);
687 else if ((ob
&& (TREE_CODE (ob
->value
) == TYPE_DECL
))
688 || (ns_binding
&& TREE_CODE (ns_binding
) == TYPE_DECL
))
689 /* Here, we have something like:
697 We must pop the for-scope binding so we know what's a
698 type and what isn't. */
699 pop_binding (name
, link
);
702 /* Mark this VAR_DECL as dead so that we can tell we left it
703 there only for backward compatibility. */
704 DECL_DEAD_FOR_LOCAL (link
) = 1;
706 /* Keep track of what should have happened when we
707 popped the binding. */
710 SET_DECL_SHADOWED_FOR_VAR (link
, ob
->value
);
711 DECL_HAS_SHADOWED_FOR_VAR_P (link
) = 1;
714 /* Add it to the list of dead variables in the next
715 outermost binding to that we can remove these when we
716 leave that binding. */
718 current_binding_level
->level_chain
->dead_vars_from_for
,
721 /* Although we don't pop the cxx_binding, we do clear
722 its SCOPE since the scope is going away now. */
723 IDENTIFIER_BINDING (name
)->scope
724 = current_binding_level
->level_chain
;
731 /* Remove the binding. */
734 if (TREE_CODE (decl
) == TREE_LIST
)
735 decl
= TREE_VALUE (decl
);
738 if (TREE_CODE (name
) == OVERLOAD
)
739 name
= OVL_FUNCTION (name
);
741 gcc_assert (DECL_P (name
));
742 pop_binding (DECL_NAME (name
), decl
);
746 /* Remove declarations for any `for' variables from inner scopes
747 that we kept around. */
748 FOR_EACH_VEC_SAFE_ELT_REVERSE (current_binding_level
->dead_vars_from_for
,
750 pop_binding (DECL_NAME (decl
), decl
);
752 /* Restore the IDENTIFIER_TYPE_VALUEs. */
753 for (link
= current_binding_level
->type_shadowed
;
754 link
; link
= TREE_CHAIN (link
))
755 SET_IDENTIFIER_TYPE_VALUE (TREE_PURPOSE (link
), TREE_VALUE (link
));
757 /* Restore the IDENTIFIER_LABEL_VALUEs for local labels. */
758 FOR_EACH_VEC_SAFE_ELT_REVERSE (current_binding_level
->shadowed_labels
,
760 pop_local_label (label_bind
->label
, label_bind
->prev_value
);
762 /* There may be OVERLOADs (wrapped in TREE_LISTs) on the BLOCK_VARs
763 list if a `using' declaration put them there. The debugging
764 back ends won't understand OVERLOAD, so we remove them here.
765 Because the BLOCK_VARS are (temporarily) shared with
766 CURRENT_BINDING_LEVEL->NAMES we must do this fixup after we have
767 popped all the bindings. */
772 for (d
= &BLOCK_VARS (block
); *d
; )
774 if (TREE_CODE (*d
) == TREE_LIST
)
775 *d
= TREE_CHAIN (*d
);
777 d
= &DECL_CHAIN (*d
);
781 /* If the level being exited is the top level of a function,
782 check over all the labels. */
787 /* Since this is the top level block of a function, the vars are
788 the function's parameters. Don't leave them in the BLOCK
789 because they are found in the FUNCTION_DECL instead. */
790 BLOCK_VARS (block
) = 0;
794 pop_labels (subblocks
);
797 kind
= current_binding_level
->kind
;
798 if (kind
== sk_cleanup
)
802 /* If this is a temporary binding created for a cleanup, then we'll
803 have pushed a statement list level. Pop that, create a new
804 BIND_EXPR for the block, and insert it into the stream. */
805 stmt
= pop_stmt_list (current_binding_level
->statement_list
);
806 stmt
= c_build_bind_expr (input_location
, block
, stmt
);
813 /* The current function is being defined, so its DECL_INITIAL
814 should be error_mark_node. */
815 gcc_assert (DECL_INITIAL (current_function_decl
) == error_mark_node
);
816 DECL_INITIAL (current_function_decl
) = block
? block
: subblocks
;
819 if (FUNCTION_NEEDS_BODY_BLOCK (current_function_decl
))
821 if (BLOCK_SUBBLOCKS (subblocks
))
822 BLOCK_OUTER_CURLY_BRACE_P (BLOCK_SUBBLOCKS (subblocks
)) = 1;
825 BLOCK_OUTER_CURLY_BRACE_P (subblocks
) = 1;
829 current_binding_level
->blocks
830 = block_chainon (current_binding_level
->blocks
, block
);
832 /* If we did not make a block for the level just exited,
833 any blocks made for inner levels
834 (since they cannot be recorded as subblocks in that level)
835 must be carried forward so they will later become subblocks
836 of something else. */
838 current_binding_level
->blocks
839 = block_chainon (current_binding_level
->blocks
, subblocks
);
841 /* Each and every BLOCK node created here in `poplevel' is important
842 (e.g. for proper debugging information) so if we created one
843 earlier, mark it as "used". */
845 TREE_USED (block
) = 1;
847 /* All temporary bindings created for cleanups are popped silently. */
848 if (kind
== sk_cleanup
)
851 timevar_cond_stop (TV_NAME_LOOKUP
, subtime
);
855 /* Walk all the namespaces contained NAMESPACE, including NAMESPACE
856 itself, calling F for each. The DATA is passed to F as well. */
859 walk_namespaces_r (tree name_space
, walk_namespaces_fn f
, void* data
)
862 tree current
= NAMESPACE_LEVEL (name_space
)->namespaces
;
864 result
|= (*f
) (name_space
, data
);
866 for (; current
; current
= DECL_CHAIN (current
))
867 result
|= walk_namespaces_r (current
, f
, data
);
872 /* Walk all the namespaces, calling F for each. The DATA is passed to
876 walk_namespaces (walk_namespaces_fn f
, void* data
)
878 return walk_namespaces_r (global_namespace
, f
, data
);
881 /* Call wrapup_globals_declarations for the globals in NAMESPACE. */
884 wrapup_globals_for_namespace (tree name_space
, void* data ATTRIBUTE_UNUSED
)
886 cp_binding_level
*level
= NAMESPACE_LEVEL (name_space
);
887 vec
<tree
, va_gc
> *statics
= level
->static_decls
;
888 tree
*vec
= statics
->address ();
889 int len
= statics
->length ();
891 /* Write out any globals that need to be output. */
892 return wrapup_global_declarations (vec
, len
);
895 /* In C++, you don't have to write `struct S' to refer to `S'; you
896 can just use `S'. We accomplish this by creating a TYPE_DECL as
897 if the user had written `typedef struct S S'. Create and return
898 the TYPE_DECL for TYPE. */
901 create_implicit_typedef (tree name
, tree type
)
905 decl
= build_decl (input_location
, TYPE_DECL
, name
, type
);
906 DECL_ARTIFICIAL (decl
) = 1;
907 /* There are other implicit type declarations, like the one *within*
908 a class that allows you to write `S::S'. We must distinguish
910 SET_DECL_IMPLICIT_TYPEDEF_P (decl
);
911 TYPE_NAME (type
) = decl
;
912 TYPE_STUB_DECL (type
) = decl
;
917 /* Remember a local name for name-mangling purposes. */
920 push_local_name (tree decl
)
925 timevar_start (TV_NAME_LOOKUP
);
927 name
= DECL_NAME (decl
);
929 nelts
= vec_safe_length (local_names
);
930 for (i
= 0; i
< nelts
; i
++)
932 t
= (*local_names
)[i
];
933 if (DECL_NAME (t
) == name
)
935 if (!DECL_LANG_SPECIFIC (decl
))
936 retrofit_lang_decl (decl
);
937 DECL_LANG_SPECIFIC (decl
)->u
.base
.u2sel
= 1;
938 if (DECL_DISCRIMINATOR_SET_P (t
))
939 DECL_DISCRIMINATOR (decl
) = DECL_DISCRIMINATOR (t
) + 1;
941 DECL_DISCRIMINATOR (decl
) = 1;
943 (*local_names
)[i
] = decl
;
944 timevar_stop (TV_NAME_LOOKUP
);
949 vec_safe_push (local_names
, decl
);
950 timevar_stop (TV_NAME_LOOKUP
);
953 /* Subroutine of duplicate_decls: return truthvalue of whether
954 or not types of these decls match.
956 For C++, we must compare the parameter list so that `int' can match
957 `int&' in a parameter position, but `int&' is not confused with
961 decls_match (tree newdecl
, tree olddecl
)
965 if (newdecl
== olddecl
)
968 if (TREE_CODE (newdecl
) != TREE_CODE (olddecl
))
969 /* If the two DECLs are not even the same kind of thing, we're not
970 interested in their types. */
973 gcc_assert (DECL_P (newdecl
));
975 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
977 tree f1
= TREE_TYPE (newdecl
);
978 tree f2
= TREE_TYPE (olddecl
);
979 tree p1
= TYPE_ARG_TYPES (f1
);
980 tree p2
= TYPE_ARG_TYPES (f2
);
983 /* Specializations of different templates are different functions
984 even if they have the same type. */
985 tree t1
= (DECL_USE_TEMPLATE (newdecl
)
986 ? DECL_TI_TEMPLATE (newdecl
)
988 tree t2
= (DECL_USE_TEMPLATE (olddecl
)
989 ? DECL_TI_TEMPLATE (olddecl
)
994 if (CP_DECL_CONTEXT (newdecl
) != CP_DECL_CONTEXT (olddecl
)
995 && ! (DECL_EXTERN_C_P (newdecl
)
996 && DECL_EXTERN_C_P (olddecl
)))
999 /* A new declaration doesn't match a built-in one unless it
1000 is also extern "C". */
1001 if (DECL_IS_BUILTIN (olddecl
)
1002 && DECL_EXTERN_C_P (olddecl
) && !DECL_EXTERN_C_P (newdecl
))
1005 if (TREE_CODE (f1
) != TREE_CODE (f2
))
1008 /* A declaration with deduced return type should use its pre-deduction
1009 type for declaration matching. */
1010 r2
= fndecl_declared_return_type (olddecl
);
1012 if (same_type_p (TREE_TYPE (f1
), r2
))
1014 if (!prototype_p (f2
) && DECL_EXTERN_C_P (olddecl
)
1015 && (DECL_BUILT_IN (olddecl
)
1016 #ifndef NO_IMPLICIT_EXTERN_C
1017 || (DECL_IN_SYSTEM_HEADER (newdecl
) && !DECL_CLASS_SCOPE_P (newdecl
))
1018 || (DECL_IN_SYSTEM_HEADER (olddecl
) && !DECL_CLASS_SCOPE_P (olddecl
))
1022 types_match
= self_promoting_args_p (p1
);
1023 if (p1
== void_list_node
)
1024 TREE_TYPE (newdecl
) = TREE_TYPE (olddecl
);
1026 #ifndef NO_IMPLICIT_EXTERN_C
1027 else if (!prototype_p (f1
)
1028 && (DECL_EXTERN_C_P (olddecl
)
1029 && DECL_IN_SYSTEM_HEADER (olddecl
)
1030 && !DECL_CLASS_SCOPE_P (olddecl
))
1031 && (DECL_EXTERN_C_P (newdecl
)
1032 && DECL_IN_SYSTEM_HEADER (newdecl
)
1033 && !DECL_CLASS_SCOPE_P (newdecl
)))
1035 types_match
= self_promoting_args_p (p2
);
1036 TREE_TYPE (newdecl
) = TREE_TYPE (olddecl
);
1042 && type_memfn_rqual (f1
) == type_memfn_rqual (f2
)
1043 && (TYPE_ATTRIBUTES (TREE_TYPE (newdecl
)) == NULL_TREE
1044 || comp_type_attributes (TREE_TYPE (newdecl
),
1045 TREE_TYPE (olddecl
)) != 0);
1050 /* The decls dont match if they correspond to two different versions
1051 of the same function. Disallow extern "C" functions to be
1052 versions for now. */
1054 && !DECL_EXTERN_C_P (newdecl
)
1055 && !DECL_EXTERN_C_P (olddecl
)
1056 && targetm
.target_option
.function_versions (newdecl
, olddecl
))
1058 /* Mark functions as versions if necessary. Modify the mangled decl
1059 name if necessary. */
1060 if (DECL_FUNCTION_VERSIONED (newdecl
)
1061 && DECL_FUNCTION_VERSIONED (olddecl
))
1063 if (!DECL_FUNCTION_VERSIONED (newdecl
))
1065 DECL_FUNCTION_VERSIONED (newdecl
) = 1;
1066 if (DECL_ASSEMBLER_NAME_SET_P (newdecl
))
1067 mangle_decl (newdecl
);
1069 if (!DECL_FUNCTION_VERSIONED (olddecl
))
1071 DECL_FUNCTION_VERSIONED (olddecl
) = 1;
1072 if (DECL_ASSEMBLER_NAME_SET_P (olddecl
))
1073 mangle_decl (olddecl
);
1075 cgraph_node::record_function_versions (olddecl
, newdecl
);
1079 else if (TREE_CODE (newdecl
) == TEMPLATE_DECL
)
1081 tree oldres
= DECL_TEMPLATE_RESULT (olddecl
);
1082 tree newres
= DECL_TEMPLATE_RESULT (newdecl
);
1084 if (TREE_CODE (newres
) != TREE_CODE (oldres
))
1087 if (!comp_template_parms (DECL_TEMPLATE_PARMS (newdecl
),
1088 DECL_TEMPLATE_PARMS (olddecl
)))
1091 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl
)) == TYPE_DECL
)
1092 types_match
= (same_type_p (TREE_TYPE (oldres
), TREE_TYPE (newres
))
1093 && equivalently_constrained (olddecl
, newdecl
));
1095 // We don't need to check equivalently_constrained for variable and
1096 // function templates because we check it on the results.
1097 types_match
= decls_match (oldres
, newres
);
1101 /* Need to check scope for variable declaration (VAR_DECL).
1102 For typedef (TYPE_DECL), scope is ignored. */
1104 && CP_DECL_CONTEXT (newdecl
) != CP_DECL_CONTEXT (olddecl
)
1106 Two declarations for an object with C language linkage
1107 with the same name (ignoring the namespace that qualify
1108 it) that appear in different namespace scopes refer to
1110 && !(DECL_EXTERN_C_P (olddecl
) && DECL_EXTERN_C_P (newdecl
)))
1113 if (TREE_TYPE (newdecl
) == error_mark_node
)
1114 types_match
= TREE_TYPE (olddecl
) == error_mark_node
;
1115 else if (TREE_TYPE (olddecl
) == NULL_TREE
)
1116 types_match
= TREE_TYPE (newdecl
) == NULL_TREE
;
1117 else if (TREE_TYPE (newdecl
) == NULL_TREE
)
1120 types_match
= comptypes (TREE_TYPE (newdecl
),
1121 TREE_TYPE (olddecl
),
1122 COMPARE_REDECLARATION
);
1125 // Normal functions can be constrained, as can variable partial
1127 if (types_match
&& VAR_OR_FUNCTION_DECL_P (newdecl
))
1128 types_match
= equivalently_constrained (newdecl
, olddecl
);
1133 /* If NEWDECL is `static' and an `extern' was seen previously,
1134 warn about it. OLDDECL is the previous declaration.
1136 Note that this does not apply to the C++ case of declaring
1137 a variable `extern const' and then later `const'.
1139 Don't complain about built-in functions, since they are beyond
1140 the user's control. */
1143 warn_extern_redeclared_static (tree newdecl
, tree olddecl
)
1145 if (TREE_CODE (newdecl
) == TYPE_DECL
1146 || TREE_CODE (newdecl
) == TEMPLATE_DECL
1147 || TREE_CODE (newdecl
) == CONST_DECL
1148 || TREE_CODE (newdecl
) == NAMESPACE_DECL
)
1151 /* Don't get confused by static member functions; that's a different
1153 if (TREE_CODE (newdecl
) == FUNCTION_DECL
1154 && DECL_STATIC_FUNCTION_P (newdecl
))
1157 /* If the old declaration was `static', or the new one isn't, then
1158 everything is OK. */
1159 if (DECL_THIS_STATIC (olddecl
) || !DECL_THIS_STATIC (newdecl
))
1162 /* It's OK to declare a builtin function as `static'. */
1163 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1164 && DECL_ARTIFICIAL (olddecl
))
1167 if (permerror (DECL_SOURCE_LOCATION (newdecl
),
1168 "%qD was declared %<extern%> and later %<static%>", newdecl
))
1169 inform (DECL_SOURCE_LOCATION (olddecl
),
1170 "previous declaration of %qD", olddecl
);
1173 /* NEW_DECL is a redeclaration of OLD_DECL; both are functions or
1174 function templates. If their exception specifications do not
1175 match, issue a diagnostic. */
1178 check_redeclaration_exception_specification (tree new_decl
,
1181 tree new_exceptions
= TYPE_RAISES_EXCEPTIONS (TREE_TYPE (new_decl
));
1182 tree old_exceptions
= TYPE_RAISES_EXCEPTIONS (TREE_TYPE (old_decl
));
1184 /* Two default specs are equivalent, don't force evaluation. */
1185 if (UNEVALUATED_NOEXCEPT_SPEC_P (new_exceptions
)
1186 && UNEVALUATED_NOEXCEPT_SPEC_P (old_exceptions
))
1189 maybe_instantiate_noexcept (new_decl
);
1190 maybe_instantiate_noexcept (old_decl
);
1191 new_exceptions
= TYPE_RAISES_EXCEPTIONS (TREE_TYPE (new_decl
));
1192 old_exceptions
= TYPE_RAISES_EXCEPTIONS (TREE_TYPE (old_decl
));
1196 If any declaration of a function has an exception-specification,
1197 all declarations, including the definition and an explicit
1198 specialization, of that function shall have an
1199 exception-specification with the same set of type-ids. */
1200 if (! DECL_IS_BUILTIN (old_decl
)
1202 && !comp_except_specs (new_exceptions
, old_exceptions
, ce_normal
))
1205 = "declaration of %q+F has a different exception specifier";
1206 bool complained
= true;
1207 if (! DECL_IN_SYSTEM_HEADER (old_decl
))
1208 error (msg
, new_decl
);
1210 complained
= pedwarn (0, OPT_Wsystem_headers
, msg
, new_decl
);
1212 inform (0, "from previous declaration %q+F", old_decl
);
1216 /* Return true if OLD_DECL and NEW_DECL agree on constexprness.
1217 Otherwise issue diagnostics. */
1220 validate_constexpr_redeclaration (tree old_decl
, tree new_decl
)
1222 old_decl
= STRIP_TEMPLATE (old_decl
);
1223 new_decl
= STRIP_TEMPLATE (new_decl
);
1224 if (!VAR_OR_FUNCTION_DECL_P (old_decl
)
1225 || !VAR_OR_FUNCTION_DECL_P (new_decl
))
1227 if (DECL_DECLARED_CONSTEXPR_P (old_decl
)
1228 == DECL_DECLARED_CONSTEXPR_P (new_decl
))
1230 if (TREE_CODE (old_decl
) == FUNCTION_DECL
)
1232 if (DECL_BUILT_IN (old_decl
))
1234 /* Hide a built-in declaration. */
1235 DECL_DECLARED_CONSTEXPR_P (old_decl
)
1236 = DECL_DECLARED_CONSTEXPR_P (new_decl
);
1239 /* 7.1.5 [dcl.constexpr]
1240 Note: An explicit specialization can differ from the template
1241 declaration with respect to the constexpr specifier. */
1242 if (! DECL_TEMPLATE_SPECIALIZATION (old_decl
)
1243 && DECL_TEMPLATE_SPECIALIZATION (new_decl
))
1246 error ("redeclaration %q+D differs in %<constexpr%>", new_decl
);
1247 error ("from previous declaration %q+D", old_decl
);
1253 // If OLDDECL and NEWDECL are concept declarations with the same type
1254 // (i.e., and template parameters), but different requirements,
1255 // emit diagnostics and return true. Otherwise, return false.
1257 check_concept_refinement (tree olddecl
, tree newdecl
)
1259 if (!DECL_DECLARED_CONCEPT_P (olddecl
) || !DECL_DECLARED_CONCEPT_P (newdecl
))
1262 tree d1
= DECL_TEMPLATE_RESULT (olddecl
);
1263 tree d2
= DECL_TEMPLATE_RESULT (newdecl
);
1264 if (TREE_CODE (d1
) != TREE_CODE (d2
))
1267 tree t1
= TREE_TYPE (d1
);
1268 tree t2
= TREE_TYPE (d2
);
1269 if (TREE_CODE (d1
) == FUNCTION_DECL
)
1271 if (compparms (TYPE_ARG_TYPES (t1
), TYPE_ARG_TYPES (t2
))
1272 && comp_template_parms (DECL_TEMPLATE_PARMS (olddecl
),
1273 DECL_TEMPLATE_PARMS (newdecl
))
1274 && !equivalently_constrained (olddecl
, newdecl
))
1276 error ("cannot specialize concept %q#D", olddecl
);
1283 /* DECL is a redeclaration of a function or function template. If
1284 it does have default arguments issue a diagnostic. Note: this
1285 function is used to enforce the requirements in C++11 8.3.6 about
1286 no default arguments in redeclarations. */
1289 check_redeclaration_no_default_args (tree decl
)
1291 gcc_assert (DECL_DECLARES_FUNCTION_P (decl
));
1293 for (tree t
= FUNCTION_FIRST_USER_PARMTYPE (decl
);
1294 t
&& t
!= void_list_node
; t
= TREE_CHAIN (t
))
1295 if (TREE_PURPOSE (t
))
1297 permerror (DECL_SOURCE_LOCATION (decl
),
1298 "redeclaration of %q#D may not have default "
1304 #define GNU_INLINE_P(fn) (DECL_DECLARED_INLINE_P (fn) \
1305 && lookup_attribute ("gnu_inline", \
1306 DECL_ATTRIBUTES (fn)))
1308 /* If NEWDECL is a redeclaration of OLDDECL, merge the declarations.
1309 If the redeclaration is invalid, a diagnostic is issued, and the
1310 error_mark_node is returned. Otherwise, OLDDECL is returned.
1312 If NEWDECL is not a redeclaration of OLDDECL, NULL_TREE is
1315 NEWDECL_IS_FRIEND is true if NEWDECL was declared as a friend. */
1318 duplicate_decls (tree newdecl
, tree olddecl
, bool newdecl_is_friend
)
1320 unsigned olddecl_uid
= DECL_UID (olddecl
);
1321 int olddecl_friend
= 0, types_match
= 0, hidden_friend
= 0;
1322 int new_defines_function
= 0;
1323 tree new_template_info
;
1325 if (newdecl
== olddecl
)
1328 types_match
= decls_match (newdecl
, olddecl
);
1330 /* If either the type of the new decl or the type of the old decl is an
1331 error_mark_node, then that implies that we have already issued an
1332 error (earlier) for some bogus type specification, and in that case,
1333 it is rather pointless to harass the user with yet more error message
1334 about the same declaration, so just pretend the types match here. */
1335 if (TREE_TYPE (newdecl
) == error_mark_node
1336 || TREE_TYPE (olddecl
) == error_mark_node
)
1337 return error_mark_node
;
1339 if (UDLIT_OPER_P (DECL_NAME (newdecl
))
1340 && UDLIT_OPER_P (DECL_NAME (olddecl
)))
1342 if (TREE_CODE (newdecl
) == TEMPLATE_DECL
1343 && TREE_CODE (olddecl
) != TEMPLATE_DECL
1344 && check_raw_literal_operator (olddecl
))
1345 error ("literal operator template %q+D conflicts with"
1346 " raw literal operator %qD", newdecl
, olddecl
);
1347 else if (TREE_CODE (newdecl
) != TEMPLATE_DECL
1348 && TREE_CODE (olddecl
) == TEMPLATE_DECL
1349 && check_raw_literal_operator (newdecl
))
1350 error ("raw literal operator %q+D conflicts with"
1351 " literal operator template %qD", newdecl
, olddecl
);
1354 if (DECL_P (olddecl
)
1355 && TREE_CODE (newdecl
) == FUNCTION_DECL
1356 && TREE_CODE (olddecl
) == FUNCTION_DECL
1357 && (DECL_UNINLINABLE (newdecl
) || DECL_UNINLINABLE (olddecl
)))
1359 if (DECL_DECLARED_INLINE_P (newdecl
)
1360 && DECL_UNINLINABLE (newdecl
)
1361 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl
)))
1362 /* Already warned elsewhere. */;
1363 else if (DECL_DECLARED_INLINE_P (olddecl
)
1364 && DECL_UNINLINABLE (olddecl
)
1365 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl
)))
1366 /* Already warned. */;
1367 else if (DECL_DECLARED_INLINE_P (newdecl
)
1368 && DECL_UNINLINABLE (olddecl
)
1369 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl
)))
1371 if (warning_at (DECL_SOURCE_LOCATION (newdecl
),
1372 OPT_Wattributes
, "function %qD redeclared as inline",
1374 inform (DECL_SOURCE_LOCATION (olddecl
),
1375 "previous declaration of %qD with attribute noinline",
1378 else if (DECL_DECLARED_INLINE_P (olddecl
)
1379 && DECL_UNINLINABLE (newdecl
)
1380 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl
)))
1382 if (warning_at (DECL_SOURCE_LOCATION (newdecl
),
1383 OPT_Wattributes
, "function %qD redeclared with "
1384 "attribute noinline", newdecl
))
1385 inform (DECL_SOURCE_LOCATION (olddecl
),
1386 "previous declaration of %qD was inline",
1391 /* Check for redeclaration and other discrepancies. */
1392 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1393 && DECL_ARTIFICIAL (olddecl
))
1395 gcc_assert (!DECL_HIDDEN_FRIEND_P (olddecl
));
1396 if (TREE_CODE (newdecl
) != FUNCTION_DECL
)
1398 /* Avoid warnings redeclaring built-ins which have not been
1399 explicitly declared. */
1400 if (DECL_ANTICIPATED (olddecl
))
1403 /* If you declare a built-in or predefined function name as static,
1404 the old definition is overridden, but optionally warn this was a
1405 bad choice of name. */
1406 if (! TREE_PUBLIC (newdecl
))
1408 warning (OPT_Wshadow
,
1409 DECL_BUILT_IN (olddecl
)
1410 ? G_("shadowing built-in function %q#D")
1411 : G_("shadowing library function %q#D"), olddecl
);
1412 /* Discard the old built-in function. */
1415 /* If the built-in is not ansi, then programs can override
1416 it even globally without an error. */
1417 else if (! DECL_BUILT_IN (olddecl
))
1418 warning_at (DECL_SOURCE_LOCATION (newdecl
), 0,
1419 "library function %q#D redeclared as non-function %q#D",
1422 error ("declaration of %q+#D conflicts with built-in "
1423 "declaration %q#D", newdecl
, olddecl
);
1426 else if (DECL_OMP_DECLARE_REDUCTION_P (olddecl
))
1428 gcc_assert (DECL_OMP_DECLARE_REDUCTION_P (newdecl
));
1429 error_at (DECL_SOURCE_LOCATION (newdecl
),
1430 "redeclaration of %<pragma omp declare reduction%>");
1431 inform (DECL_SOURCE_LOCATION (olddecl
),
1432 "previous %<pragma omp declare reduction%> declaration");
1433 return error_mark_node
;
1435 else if (!types_match
)
1437 /* Avoid warnings redeclaring built-ins which have not been
1438 explicitly declared. */
1439 if (DECL_ANTICIPATED (olddecl
))
1441 /* Deal with fileptr_type_node. FILE type is not known
1442 at the time we create the builtins. */
1445 for (t1
= TYPE_ARG_TYPES (TREE_TYPE (newdecl
)),
1446 t2
= TYPE_ARG_TYPES (TREE_TYPE (olddecl
));
1448 t1
= TREE_CHAIN (t1
), t2
= TREE_CHAIN (t2
))
1451 else if (TREE_VALUE (t2
) == fileptr_type_node
)
1453 tree t
= TREE_VALUE (t1
);
1456 && TYPE_IDENTIFIER (TREE_TYPE (t
))
1457 == get_identifier ("FILE")
1458 && compparms (TREE_CHAIN (t1
), TREE_CHAIN (t2
)))
1460 tree oldargs
= TYPE_ARG_TYPES (TREE_TYPE (olddecl
));
1462 TYPE_ARG_TYPES (TREE_TYPE (olddecl
))
1463 = TYPE_ARG_TYPES (TREE_TYPE (newdecl
));
1464 types_match
= decls_match (newdecl
, olddecl
);
1466 return duplicate_decls (newdecl
, olddecl
,
1468 TYPE_ARG_TYPES (TREE_TYPE (olddecl
)) = oldargs
;
1471 else if (! same_type_p (TREE_VALUE (t1
), TREE_VALUE (t2
)))
1474 else if ((DECL_EXTERN_C_P (newdecl
)
1475 && DECL_EXTERN_C_P (olddecl
))
1476 || compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl
)),
1477 TYPE_ARG_TYPES (TREE_TYPE (olddecl
))))
1479 /* A near match; override the builtin. */
1481 if (TREE_PUBLIC (newdecl
))
1482 warning_at (DECL_SOURCE_LOCATION (newdecl
), 0,
1483 "new declaration %q#D ambiguates built-in "
1484 "declaration %q#D", newdecl
, olddecl
);
1486 warning (OPT_Wshadow
,
1487 DECL_BUILT_IN (olddecl
)
1488 ? G_("shadowing built-in function %q#D")
1489 : G_("shadowing library function %q#D"), olddecl
);
1492 /* Discard the old built-in function. */
1495 /* Replace the old RTL to avoid problems with inlining. */
1496 COPY_DECL_RTL (newdecl
, olddecl
);
1498 /* Even if the types match, prefer the new declarations type for
1499 built-ins which have not been explicitly declared, for
1500 exception lists, etc... */
1501 else if (DECL_IS_BUILTIN (olddecl
))
1503 tree type
= TREE_TYPE (newdecl
);
1504 tree attribs
= (*targetm
.merge_type_attributes
)
1505 (TREE_TYPE (olddecl
), type
);
1507 type
= cp_build_type_attribute_variant (type
, attribs
);
1508 TREE_TYPE (newdecl
) = TREE_TYPE (olddecl
) = type
;
1511 /* If a function is explicitly declared "throw ()", propagate that to
1512 the corresponding builtin. */
1513 if (DECL_BUILT_IN_CLASS (olddecl
) == BUILT_IN_NORMAL
1514 && DECL_ANTICIPATED (olddecl
)
1515 && TREE_NOTHROW (newdecl
)
1516 && !TREE_NOTHROW (olddecl
))
1518 enum built_in_function fncode
= DECL_FUNCTION_CODE (olddecl
);
1519 tree tmpdecl
= builtin_decl_explicit (fncode
);
1520 if (tmpdecl
&& tmpdecl
!= olddecl
&& types_match
)
1521 TREE_NOTHROW (tmpdecl
) = 1;
1524 /* Whether or not the builtin can throw exceptions has no
1525 bearing on this declarator. */
1526 TREE_NOTHROW (olddecl
) = 0;
1528 if (DECL_THIS_STATIC (newdecl
) && !DECL_THIS_STATIC (olddecl
))
1530 /* If a builtin function is redeclared as `static', merge
1531 the declarations, but make the original one static. */
1532 DECL_THIS_STATIC (olddecl
) = 1;
1533 TREE_PUBLIC (olddecl
) = 0;
1535 /* Make the old declaration consistent with the new one so
1536 that all remnants of the builtin-ness of this function
1537 will be banished. */
1538 SET_DECL_LANGUAGE (olddecl
, DECL_LANGUAGE (newdecl
));
1539 COPY_DECL_RTL (newdecl
, olddecl
);
1542 else if (TREE_CODE (olddecl
) != TREE_CODE (newdecl
))
1544 /* C++ Standard, 3.3, clause 4:
1545 "[Note: a namespace name or a class template name must be unique
1546 in its declarative region (7.3.2, clause 14). ]" */
1547 if (TREE_CODE (olddecl
) != NAMESPACE_DECL
1548 && TREE_CODE (newdecl
) != NAMESPACE_DECL
1549 && (TREE_CODE (olddecl
) != TEMPLATE_DECL
1550 || TREE_CODE (DECL_TEMPLATE_RESULT (olddecl
)) != TYPE_DECL
)
1551 && (TREE_CODE (newdecl
) != TEMPLATE_DECL
1552 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl
)) != TYPE_DECL
))
1554 if ((TREE_CODE (olddecl
) == TYPE_DECL
&& DECL_ARTIFICIAL (olddecl
)
1555 && TREE_CODE (newdecl
) != TYPE_DECL
)
1556 || (TREE_CODE (newdecl
) == TYPE_DECL
&& DECL_ARTIFICIAL (newdecl
)
1557 && TREE_CODE (olddecl
) != TYPE_DECL
))
1559 /* We do nothing special here, because C++ does such nasty
1560 things with TYPE_DECLs. Instead, just let the TYPE_DECL
1561 get shadowed, and know that if we need to find a TYPE_DECL
1562 for a given name, we can look in the IDENTIFIER_TYPE_VALUE
1563 slot of the identifier. */
1567 if ((TREE_CODE (newdecl
) == FUNCTION_DECL
1568 && DECL_FUNCTION_TEMPLATE_P (olddecl
))
1569 || (TREE_CODE (olddecl
) == FUNCTION_DECL
1570 && DECL_FUNCTION_TEMPLATE_P (newdecl
)))
1574 error ("%q#D redeclared as different kind of symbol", newdecl
);
1575 if (TREE_CODE (olddecl
) == TREE_LIST
)
1576 olddecl
= TREE_VALUE (olddecl
);
1577 inform (DECL_SOURCE_LOCATION (olddecl
),
1578 "previous declaration %q#D", olddecl
);
1580 return error_mark_node
;
1582 else if (!types_match
)
1584 if (CP_DECL_CONTEXT (newdecl
) != CP_DECL_CONTEXT (olddecl
))
1585 /* These are certainly not duplicate declarations; they're
1586 from different scopes. */
1589 if (TREE_CODE (newdecl
) == TEMPLATE_DECL
)
1591 /* The name of a class template may not be declared to refer to
1592 any other template, class, function, object, namespace, value,
1593 or type in the same scope. */
1594 if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl
)) == TYPE_DECL
1595 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl
)) == TYPE_DECL
)
1597 error ("conflicting declaration of template %q+#D", newdecl
);
1598 inform (DECL_SOURCE_LOCATION (olddecl
),
1599 "previous declaration %q#D", olddecl
);
1600 return error_mark_node
;
1602 else if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl
)) == FUNCTION_DECL
1603 && TREE_CODE (DECL_TEMPLATE_RESULT (newdecl
)) == FUNCTION_DECL
1604 && compparms (TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl
))),
1605 TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl
))))
1606 && comp_template_parms (DECL_TEMPLATE_PARMS (newdecl
),
1607 DECL_TEMPLATE_PARMS (olddecl
))
1608 /* Template functions can be disambiguated by
1610 && same_type_p (TREE_TYPE (TREE_TYPE (newdecl
)),
1611 TREE_TYPE (TREE_TYPE (olddecl
)))
1612 // Template functions can also be disambiguated by
1614 && equivalently_constrained (olddecl
, newdecl
))
1616 error ("ambiguating new declaration %q+#D", newdecl
);
1617 inform (DECL_SOURCE_LOCATION (olddecl
),
1618 "old declaration %q#D", olddecl
);
1620 else if (check_concept_refinement (olddecl
, newdecl
))
1621 return error_mark_node
;
1624 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1626 if (DECL_EXTERN_C_P (newdecl
) && DECL_EXTERN_C_P (olddecl
))
1628 error ("conflicting declaration of C function %q+#D",
1630 inform (DECL_SOURCE_LOCATION (olddecl
),
1631 "previous declaration %q#D", olddecl
);
1634 /* For function versions, params and types match, but they
1635 are not ambiguous. */
1636 else if ((!DECL_FUNCTION_VERSIONED (newdecl
)
1637 && !DECL_FUNCTION_VERSIONED (olddecl
))
1638 // The functions have the same parameter types.
1639 && compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl
)),
1640 TYPE_ARG_TYPES (TREE_TYPE (olddecl
)))
1641 // And the same constraints.
1642 && equivalently_constrained (newdecl
, olddecl
))
1644 error ("ambiguating new declaration of %q+#D", newdecl
);
1645 inform (DECL_SOURCE_LOCATION (olddecl
),
1646 "old declaration %q#D", olddecl
);
1647 return error_mark_node
;
1654 error ("conflicting declaration %q+#D", newdecl
);
1655 inform (DECL_SOURCE_LOCATION (olddecl
),
1656 "previous declaration as %q#D", olddecl
);
1657 return error_mark_node
;
1660 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
1661 && ((DECL_TEMPLATE_SPECIALIZATION (olddecl
)
1662 && (!DECL_TEMPLATE_INFO (newdecl
)
1663 || (DECL_TI_TEMPLATE (newdecl
)
1664 != DECL_TI_TEMPLATE (olddecl
))))
1665 || (DECL_TEMPLATE_SPECIALIZATION (newdecl
)
1666 && (!DECL_TEMPLATE_INFO (olddecl
)
1667 || (DECL_TI_TEMPLATE (olddecl
)
1668 != DECL_TI_TEMPLATE (newdecl
))))))
1669 /* It's OK to have a template specialization and a non-template
1670 with the same type, or to have specializations of two
1671 different templates with the same type. Note that if one is a
1672 specialization, and the other is an instantiation of the same
1673 template, that we do not exit at this point. That situation
1674 can occur if we instantiate a template class, and then
1675 specialize one of its methods. This situation is valid, but
1676 the declarations must be merged in the usual way. */
1678 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
1679 && ((DECL_TEMPLATE_INSTANTIATION (olddecl
)
1680 && !DECL_USE_TEMPLATE (newdecl
))
1681 || (DECL_TEMPLATE_INSTANTIATION (newdecl
)
1682 && !DECL_USE_TEMPLATE (olddecl
))))
1683 /* One of the declarations is a template instantiation, and the
1684 other is not a template at all. That's OK. */
1686 else if (TREE_CODE (newdecl
) == NAMESPACE_DECL
)
1688 /* In [namespace.alias] we have:
1690 In a declarative region, a namespace-alias-definition can be
1691 used to redefine a namespace-alias declared in that declarative
1692 region to refer only to the namespace to which it already
1695 Therefore, if we encounter a second alias directive for the same
1696 alias, we can just ignore the second directive. */
1697 if (DECL_NAMESPACE_ALIAS (newdecl
)
1698 && (DECL_NAMESPACE_ALIAS (newdecl
)
1699 == DECL_NAMESPACE_ALIAS (olddecl
)))
1701 /* [namespace.alias]
1703 A namespace-name or namespace-alias shall not be declared as
1704 the name of any other entity in the same declarative region.
1705 A namespace-name defined at global scope shall not be
1706 declared as the name of any other entity in any global scope
1708 error ("conflicting declaration of namespace %q+D", newdecl
);
1709 inform (DECL_SOURCE_LOCATION (olddecl
),
1710 "previous declaration of namespace %qD here", olddecl
);
1711 return error_mark_node
;
1715 const char *errmsg
= redeclaration_error_message (newdecl
, olddecl
);
1718 error_at (DECL_SOURCE_LOCATION (newdecl
), errmsg
, newdecl
);
1719 if (DECL_NAME (olddecl
) != NULL_TREE
)
1720 inform (DECL_SOURCE_LOCATION (olddecl
),
1721 (DECL_INITIAL (olddecl
) && namespace_bindings_p ())
1722 ? G_("%q#D previously defined here")
1723 : G_("%q#D previously declared here"), olddecl
);
1724 return error_mark_node
;
1726 else if (TREE_CODE (olddecl
) == FUNCTION_DECL
1727 && DECL_INITIAL (olddecl
) != NULL_TREE
1728 && !prototype_p (TREE_TYPE (olddecl
))
1729 && prototype_p (TREE_TYPE (newdecl
)))
1731 /* Prototype decl follows defn w/o prototype. */
1732 if (warning_at (DECL_SOURCE_LOCATION (newdecl
), 0,
1733 "prototype specified for %q#D", newdecl
))
1734 inform (DECL_SOURCE_LOCATION (olddecl
),
1735 "previous non-prototype definition here");
1737 else if (VAR_OR_FUNCTION_DECL_P (olddecl
)
1738 && DECL_LANGUAGE (newdecl
) != DECL_LANGUAGE (olddecl
))
1741 If two declarations of the same function or object
1742 specify different linkage-specifications ..., the program
1743 is ill-formed.... Except for functions with C++ linkage,
1744 a function declaration without a linkage specification
1745 shall not precede the first linkage specification for
1746 that function. A function can be declared without a
1747 linkage specification after an explicit linkage
1748 specification has been seen; the linkage explicitly
1749 specified in the earlier declaration is not affected by
1750 such a function declaration.
1752 DR 563 raises the question why the restrictions on
1753 functions should not also apply to objects. Older
1754 versions of G++ silently ignore the linkage-specification
1762 which is clearly wrong. Therefore, we now treat objects
1764 if (current_lang_depth () == 0)
1766 /* There is no explicit linkage-specification, so we use
1767 the linkage from the previous declaration. */
1768 if (!DECL_LANG_SPECIFIC (newdecl
))
1769 retrofit_lang_decl (newdecl
);
1770 SET_DECL_LANGUAGE (newdecl
, DECL_LANGUAGE (olddecl
));
1774 error ("conflicting declaration of %q+#D with %qL linkage",
1775 newdecl
, DECL_LANGUAGE (newdecl
));
1776 inform (DECL_SOURCE_LOCATION (olddecl
),
1777 "previous declaration with %qL linkage",
1778 DECL_LANGUAGE (olddecl
));
1782 if (DECL_LANG_SPECIFIC (olddecl
) && DECL_USE_TEMPLATE (olddecl
))
1784 else if (TREE_CODE (olddecl
) == FUNCTION_DECL
)
1786 /* Note: free functions, as TEMPLATE_DECLs, are handled below. */
1787 if (DECL_FUNCTION_MEMBER_P (olddecl
)
1788 && (/* grokfndecl passes member function templates too
1789 as FUNCTION_DECLs. */
1790 DECL_TEMPLATE_INFO (olddecl
)
1792 Default arguments for a member function of a class
1793 template shall be specified on the initial declaration
1794 of the member function within the class template. */
1795 || CLASSTYPE_TEMPLATE_INFO (CP_DECL_CONTEXT (olddecl
))))
1796 check_redeclaration_no_default_args (newdecl
);
1799 tree t1
= FUNCTION_FIRST_USER_PARMTYPE (olddecl
);
1800 tree t2
= FUNCTION_FIRST_USER_PARMTYPE (newdecl
);
1803 for (; t1
&& t1
!= void_list_node
;
1804 t1
= TREE_CHAIN (t1
), t2
= TREE_CHAIN (t2
), i
++)
1805 if (TREE_PURPOSE (t1
) && TREE_PURPOSE (t2
))
1807 if (1 == simple_cst_equal (TREE_PURPOSE (t1
),
1810 if (permerror (input_location
,
1811 "default argument given for parameter "
1812 "%d of %q#D", i
, newdecl
))
1813 inform (DECL_SOURCE_LOCATION (olddecl
),
1814 "previous specification in %q#D here",
1819 error ("default argument given for parameter %d "
1820 "of %q#D", i
, newdecl
);
1821 inform (DECL_SOURCE_LOCATION (olddecl
),
1822 "previous specification in %q#D here",
1830 /* Do not merge an implicit typedef with an explicit one. In:
1834 typedef class A A __attribute__ ((foo));
1836 the attribute should apply only to the typedef. */
1837 if (TREE_CODE (olddecl
) == TYPE_DECL
1838 && (DECL_IMPLICIT_TYPEDEF_P (olddecl
)
1839 || DECL_IMPLICIT_TYPEDEF_P (newdecl
)))
1842 /* If new decl is `static' and an `extern' was seen previously,
1844 warn_extern_redeclared_static (newdecl
, olddecl
);
1846 if (!validate_constexpr_redeclaration (olddecl
, newdecl
))
1847 return error_mark_node
;
1849 /* We have committed to returning 1 at this point. */
1850 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1852 /* Now that functions must hold information normally held
1853 by field decls, there is extra work to do so that
1854 declaration information does not get destroyed during
1856 if (DECL_VINDEX (olddecl
))
1857 DECL_VINDEX (newdecl
) = DECL_VINDEX (olddecl
);
1858 if (DECL_CONTEXT (olddecl
))
1859 DECL_CONTEXT (newdecl
) = DECL_CONTEXT (olddecl
);
1860 DECL_STATIC_CONSTRUCTOR (newdecl
) |= DECL_STATIC_CONSTRUCTOR (olddecl
);
1861 DECL_STATIC_DESTRUCTOR (newdecl
) |= DECL_STATIC_DESTRUCTOR (olddecl
);
1862 DECL_PURE_VIRTUAL_P (newdecl
) |= DECL_PURE_VIRTUAL_P (olddecl
);
1863 DECL_VIRTUAL_P (newdecl
) |= DECL_VIRTUAL_P (olddecl
);
1864 DECL_INVALID_OVERRIDER_P (newdecl
) |= DECL_INVALID_OVERRIDER_P (olddecl
);
1865 DECL_FINAL_P (newdecl
) |= DECL_FINAL_P (olddecl
);
1866 DECL_OVERRIDE_P (newdecl
) |= DECL_OVERRIDE_P (olddecl
);
1867 DECL_THIS_STATIC (newdecl
) |= DECL_THIS_STATIC (olddecl
);
1868 if (DECL_OVERLOADED_OPERATOR_P (olddecl
) != ERROR_MARK
)
1869 SET_OVERLOADED_OPERATOR_CODE
1870 (newdecl
, DECL_OVERLOADED_OPERATOR_P (olddecl
));
1871 new_defines_function
= DECL_INITIAL (newdecl
) != NULL_TREE
;
1873 /* Optionally warn about more than one declaration for the same
1874 name, but don't warn about a function declaration followed by a
1876 if (warn_redundant_decls
&& ! DECL_ARTIFICIAL (olddecl
)
1877 && !(new_defines_function
&& DECL_INITIAL (olddecl
) == NULL_TREE
)
1878 /* Don't warn about extern decl followed by definition. */
1879 && !(DECL_EXTERNAL (olddecl
) && ! DECL_EXTERNAL (newdecl
))
1880 /* Don't warn about friends, let add_friend take care of it. */
1881 && ! (newdecl_is_friend
|| DECL_FRIEND_P (olddecl
))
1882 /* Don't warn about declaration followed by specialization. */
1883 && (! DECL_TEMPLATE_SPECIALIZATION (newdecl
)
1884 || DECL_TEMPLATE_SPECIALIZATION (olddecl
)))
1886 if (warning_at (DECL_SOURCE_LOCATION (newdecl
),
1887 OPT_Wredundant_decls
,
1888 "redundant redeclaration of %qD in same scope",
1890 inform (DECL_SOURCE_LOCATION (olddecl
),
1891 "previous declaration of %qD", olddecl
);
1894 if (!(DECL_TEMPLATE_INSTANTIATION (olddecl
)
1895 && DECL_TEMPLATE_SPECIALIZATION (newdecl
)))
1897 if (DECL_DELETED_FN (newdecl
))
1899 error ("deleted definition of %q+D", newdecl
);
1900 inform (DECL_SOURCE_LOCATION (olddecl
),
1901 "previous declaration of %qD", olddecl
);
1903 DECL_DELETED_FN (newdecl
) |= DECL_DELETED_FN (olddecl
);
1907 /* Deal with C++: must preserve virtual function table size. */
1908 if (TREE_CODE (olddecl
) == TYPE_DECL
)
1910 tree newtype
= TREE_TYPE (newdecl
);
1911 tree oldtype
= TREE_TYPE (olddecl
);
1913 if (newtype
!= error_mark_node
&& oldtype
!= error_mark_node
1914 && TYPE_LANG_SPECIFIC (newtype
) && TYPE_LANG_SPECIFIC (oldtype
))
1915 CLASSTYPE_FRIEND_CLASSES (newtype
)
1916 = CLASSTYPE_FRIEND_CLASSES (oldtype
);
1918 DECL_ORIGINAL_TYPE (newdecl
) = DECL_ORIGINAL_TYPE (olddecl
);
1921 /* Copy all the DECL_... slots specified in the new decl
1922 except for any that we copy here from the old type. */
1923 DECL_ATTRIBUTES (newdecl
)
1924 = (*targetm
.merge_decl_attributes
) (olddecl
, newdecl
);
1926 if (DECL_DECLARES_FUNCTION_P (olddecl
) && DECL_DECLARES_FUNCTION_P (newdecl
))
1928 olddecl_friend
= DECL_FRIEND_P (olddecl
);
1929 hidden_friend
= (DECL_ANTICIPATED (olddecl
)
1930 && DECL_HIDDEN_FRIEND_P (olddecl
)
1931 && newdecl_is_friend
);
1934 DECL_ANTICIPATED (olddecl
) = 0;
1935 DECL_HIDDEN_FRIEND_P (olddecl
) = 0;
1939 if (TREE_CODE (newdecl
) == TEMPLATE_DECL
)
1943 old_result
= DECL_TEMPLATE_RESULT (olddecl
);
1944 new_result
= DECL_TEMPLATE_RESULT (newdecl
);
1945 TREE_TYPE (olddecl
) = TREE_TYPE (old_result
);
1946 DECL_TEMPLATE_SPECIALIZATIONS (olddecl
)
1947 = chainon (DECL_TEMPLATE_SPECIALIZATIONS (olddecl
),
1948 DECL_TEMPLATE_SPECIALIZATIONS (newdecl
));
1950 DECL_ATTRIBUTES (old_result
)
1951 = (*targetm
.merge_decl_attributes
) (old_result
, new_result
);
1953 if (DECL_FUNCTION_TEMPLATE_P (newdecl
))
1955 /* Per C++11 8.3.6/4, default arguments cannot be added in later
1956 declarations of a function template. */
1957 if (DECL_SOURCE_LOCATION (newdecl
)
1958 != DECL_SOURCE_LOCATION (olddecl
))
1959 check_redeclaration_no_default_args (newdecl
);
1961 check_default_args (newdecl
);
1963 if (GNU_INLINE_P (old_result
) != GNU_INLINE_P (new_result
)
1964 && DECL_INITIAL (new_result
))
1966 if (DECL_INITIAL (old_result
))
1967 DECL_UNINLINABLE (old_result
) = 1;
1969 DECL_UNINLINABLE (old_result
) = DECL_UNINLINABLE (new_result
);
1970 DECL_EXTERNAL (old_result
) = DECL_EXTERNAL (new_result
);
1971 DECL_NOT_REALLY_EXTERN (old_result
)
1972 = DECL_NOT_REALLY_EXTERN (new_result
);
1973 DECL_INTERFACE_KNOWN (old_result
)
1974 = DECL_INTERFACE_KNOWN (new_result
);
1975 DECL_DECLARED_INLINE_P (old_result
)
1976 = DECL_DECLARED_INLINE_P (new_result
);
1977 DECL_DISREGARD_INLINE_LIMITS (old_result
)
1978 |= DECL_DISREGARD_INLINE_LIMITS (new_result
);
1983 DECL_DECLARED_INLINE_P (old_result
)
1984 |= DECL_DECLARED_INLINE_P (new_result
);
1985 DECL_DISREGARD_INLINE_LIMITS (old_result
)
1986 |= DECL_DISREGARD_INLINE_LIMITS (new_result
);
1987 check_redeclaration_exception_specification (newdecl
, olddecl
);
1991 /* If the new declaration is a definition, update the file and
1992 line information on the declaration, and also make
1993 the old declaration the same definition. */
1994 if (DECL_INITIAL (new_result
) != NULL_TREE
)
1996 DECL_SOURCE_LOCATION (olddecl
)
1997 = DECL_SOURCE_LOCATION (old_result
)
1998 = DECL_SOURCE_LOCATION (newdecl
);
1999 DECL_INITIAL (old_result
) = DECL_INITIAL (new_result
);
2000 if (DECL_FUNCTION_TEMPLATE_P (newdecl
))
2003 DECL_ARGUMENTS (old_result
)
2004 = DECL_ARGUMENTS (new_result
);
2005 for (parm
= DECL_ARGUMENTS (old_result
); parm
;
2006 parm
= DECL_CHAIN (parm
))
2007 DECL_CONTEXT (parm
) = old_result
;
2016 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2017 check_redeclaration_exception_specification (newdecl
, olddecl
);
2019 /* Automatically handles default parameters. */
2020 tree oldtype
= TREE_TYPE (olddecl
);
2023 /* For typedefs use the old type, as the new type's DECL_NAME points
2024 at newdecl, which will be ggc_freed. */
2025 if (TREE_CODE (newdecl
) == TYPE_DECL
)
2028 /* Merge the data types specified in the two decls. */
2029 newtype
= merge_types (TREE_TYPE (newdecl
), TREE_TYPE (olddecl
));
2031 if (VAR_P (newdecl
))
2033 DECL_THIS_EXTERN (newdecl
) |= DECL_THIS_EXTERN (olddecl
);
2034 DECL_INITIALIZED_P (newdecl
) |= DECL_INITIALIZED_P (olddecl
);
2035 DECL_NONTRIVIALLY_INITIALIZED_P (newdecl
)
2036 |= DECL_NONTRIVIALLY_INITIALIZED_P (olddecl
);
2037 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (newdecl
)
2038 |= DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (olddecl
);
2040 /* Merge the threadprivate attribute from OLDDECL into NEWDECL. */
2041 if (DECL_LANG_SPECIFIC (olddecl
)
2042 && CP_DECL_THREADPRIVATE_P (olddecl
))
2044 /* Allocate a LANG_SPECIFIC structure for NEWDECL, if needed. */
2045 if (!DECL_LANG_SPECIFIC (newdecl
))
2046 retrofit_lang_decl (newdecl
);
2048 CP_DECL_THREADPRIVATE_P (newdecl
) = 1;
2052 TREE_TYPE (newdecl
) = TREE_TYPE (olddecl
) = newtype
;
2054 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2055 check_default_args (newdecl
);
2057 /* Lay the type out, unless already done. */
2058 if (! same_type_p (newtype
, oldtype
)
2059 && TREE_TYPE (newdecl
) != error_mark_node
2060 && !(processing_template_decl
&& uses_template_parms (newdecl
)))
2061 layout_type (TREE_TYPE (newdecl
));
2063 if ((VAR_P (newdecl
)
2064 || TREE_CODE (newdecl
) == PARM_DECL
2065 || TREE_CODE (newdecl
) == RESULT_DECL
2066 || TREE_CODE (newdecl
) == FIELD_DECL
2067 || TREE_CODE (newdecl
) == TYPE_DECL
)
2068 && !(processing_template_decl
&& uses_template_parms (newdecl
)))
2069 layout_decl (newdecl
, 0);
2071 /* Merge the type qualifiers. */
2072 if (TREE_READONLY (newdecl
))
2073 TREE_READONLY (olddecl
) = 1;
2074 if (TREE_THIS_VOLATILE (newdecl
))
2075 TREE_THIS_VOLATILE (olddecl
) = 1;
2076 if (TREE_NOTHROW (newdecl
))
2077 TREE_NOTHROW (olddecl
) = 1;
2079 /* Merge deprecatedness. */
2080 if (TREE_DEPRECATED (newdecl
))
2081 TREE_DEPRECATED (olddecl
) = 1;
2083 /* Preserve function specific target and optimization options */
2084 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2086 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl
)
2087 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl
))
2088 DECL_FUNCTION_SPECIFIC_TARGET (newdecl
)
2089 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl
);
2091 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl
)
2092 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl
))
2093 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl
)
2094 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl
);
2097 /* Merge the initialization information. */
2098 if (DECL_INITIAL (newdecl
) == NULL_TREE
2099 && DECL_INITIAL (olddecl
) != NULL_TREE
)
2101 DECL_INITIAL (newdecl
) = DECL_INITIAL (olddecl
);
2102 DECL_SOURCE_LOCATION (newdecl
) = DECL_SOURCE_LOCATION (olddecl
);
2103 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2105 DECL_SAVED_TREE (newdecl
) = DECL_SAVED_TREE (olddecl
);
2106 DECL_STRUCT_FUNCTION (newdecl
) = DECL_STRUCT_FUNCTION (olddecl
);
2110 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2112 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl
)
2113 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl
);
2114 DECL_NO_LIMIT_STACK (newdecl
) |= DECL_NO_LIMIT_STACK (olddecl
);
2115 TREE_THIS_VOLATILE (newdecl
) |= TREE_THIS_VOLATILE (olddecl
);
2116 TREE_NOTHROW (newdecl
) |= TREE_NOTHROW (olddecl
);
2117 DECL_IS_MALLOC (newdecl
) |= DECL_IS_MALLOC (olddecl
);
2118 DECL_IS_OPERATOR_NEW (newdecl
) |= DECL_IS_OPERATOR_NEW (olddecl
);
2119 DECL_PURE_P (newdecl
) |= DECL_PURE_P (olddecl
);
2120 TREE_READONLY (newdecl
) |= TREE_READONLY (olddecl
);
2121 DECL_LOOPING_CONST_OR_PURE_P (newdecl
)
2122 |= DECL_LOOPING_CONST_OR_PURE_P (olddecl
);
2123 /* Keep the old RTL. */
2124 COPY_DECL_RTL (olddecl
, newdecl
);
2126 else if (VAR_P (newdecl
)
2127 && (DECL_SIZE (olddecl
) || !DECL_SIZE (newdecl
)))
2129 /* Keep the old RTL. We cannot keep the old RTL if the old
2130 declaration was for an incomplete object and the new
2131 declaration is not since many attributes of the RTL will
2133 COPY_DECL_RTL (olddecl
, newdecl
);
2136 /* If cannot merge, then use the new type and qualifiers,
2137 and don't preserve the old rtl. */
2140 /* Clean out any memory we had of the old declaration. */
2141 tree oldstatic
= value_member (olddecl
, static_aggregates
);
2143 TREE_VALUE (oldstatic
) = error_mark_node
;
2145 TREE_TYPE (olddecl
) = TREE_TYPE (newdecl
);
2146 TREE_READONLY (olddecl
) = TREE_READONLY (newdecl
);
2147 TREE_THIS_VOLATILE (olddecl
) = TREE_THIS_VOLATILE (newdecl
);
2148 TREE_SIDE_EFFECTS (olddecl
) = TREE_SIDE_EFFECTS (newdecl
);
2151 /* Merge the storage class information. */
2152 merge_weak (newdecl
, olddecl
);
2154 DECL_DEFER_OUTPUT (newdecl
) |= DECL_DEFER_OUTPUT (olddecl
);
2155 TREE_PUBLIC (newdecl
) = TREE_PUBLIC (olddecl
);
2156 TREE_STATIC (olddecl
) = TREE_STATIC (newdecl
) |= TREE_STATIC (olddecl
);
2157 if (! DECL_EXTERNAL (olddecl
))
2158 DECL_EXTERNAL (newdecl
) = 0;
2159 if (! DECL_COMDAT (olddecl
))
2160 DECL_COMDAT (newdecl
) = 0;
2162 new_template_info
= NULL_TREE
;
2163 if (DECL_LANG_SPECIFIC (newdecl
) && DECL_LANG_SPECIFIC (olddecl
))
2165 bool new_redefines_gnu_inline
= false;
2167 if (new_defines_function
2168 && ((DECL_INTERFACE_KNOWN (olddecl
)
2169 && TREE_CODE (olddecl
) == FUNCTION_DECL
)
2170 || (TREE_CODE (olddecl
) == TEMPLATE_DECL
2171 && (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl
))
2172 == FUNCTION_DECL
))))
2176 if (TREE_CODE (fn
) == TEMPLATE_DECL
)
2177 fn
= DECL_TEMPLATE_RESULT (olddecl
);
2179 new_redefines_gnu_inline
= GNU_INLINE_P (fn
) && DECL_INITIAL (fn
);
2182 if (!new_redefines_gnu_inline
)
2184 DECL_INTERFACE_KNOWN (newdecl
) |= DECL_INTERFACE_KNOWN (olddecl
);
2185 DECL_NOT_REALLY_EXTERN (newdecl
) |= DECL_NOT_REALLY_EXTERN (olddecl
);
2186 DECL_COMDAT (newdecl
) |= DECL_COMDAT (olddecl
);
2188 DECL_TEMPLATE_INSTANTIATED (newdecl
)
2189 |= DECL_TEMPLATE_INSTANTIATED (olddecl
);
2190 DECL_ODR_USED (newdecl
) |= DECL_ODR_USED (olddecl
);
2192 /* If the OLDDECL is an instantiation and/or specialization,
2193 then the NEWDECL must be too. But, it may not yet be marked
2194 as such if the caller has created NEWDECL, but has not yet
2195 figured out that it is a redeclaration. */
2196 if (!DECL_USE_TEMPLATE (newdecl
))
2197 DECL_USE_TEMPLATE (newdecl
) = DECL_USE_TEMPLATE (olddecl
);
2199 /* Don't really know how much of the language-specific
2200 values we should copy from old to new. */
2201 DECL_IN_AGGR_P (newdecl
) = DECL_IN_AGGR_P (olddecl
);
2202 DECL_REPO_AVAILABLE_P (newdecl
) = DECL_REPO_AVAILABLE_P (olddecl
);
2203 DECL_INITIALIZED_IN_CLASS_P (newdecl
)
2204 |= DECL_INITIALIZED_IN_CLASS_P (olddecl
);
2206 if (LANG_DECL_HAS_MIN (newdecl
))
2208 DECL_LANG_SPECIFIC (newdecl
)->u
.min
.u2
=
2209 DECL_LANG_SPECIFIC (olddecl
)->u
.min
.u2
;
2210 if (DECL_TEMPLATE_INFO (newdecl
))
2212 new_template_info
= DECL_TEMPLATE_INFO (newdecl
);
2213 if (DECL_TEMPLATE_INSTANTIATION (olddecl
)
2214 && DECL_TEMPLATE_SPECIALIZATION (newdecl
))
2215 /* Remember the presence of explicit specialization args. */
2216 TINFO_USED_TEMPLATE_ID (DECL_TEMPLATE_INFO (olddecl
))
2217 = TINFO_USED_TEMPLATE_ID (new_template_info
);
2219 DECL_TEMPLATE_INFO (newdecl
) = DECL_TEMPLATE_INFO (olddecl
);
2221 /* Only functions have these fields. */
2222 if (DECL_DECLARES_FUNCTION_P (newdecl
))
2224 DECL_NONCONVERTING_P (newdecl
) = DECL_NONCONVERTING_P (olddecl
);
2225 DECL_BEFRIENDING_CLASSES (newdecl
)
2226 = chainon (DECL_BEFRIENDING_CLASSES (newdecl
),
2227 DECL_BEFRIENDING_CLASSES (olddecl
));
2228 /* DECL_THUNKS is only valid for virtual functions,
2229 otherwise it is a DECL_FRIEND_CONTEXT. */
2230 if (DECL_VIRTUAL_P (newdecl
))
2231 SET_DECL_THUNKS (newdecl
, DECL_THUNKS (olddecl
));
2233 /* Only variables have this field. */
2234 else if (VAR_P (newdecl
)
2235 && VAR_HAD_UNKNOWN_BOUND (olddecl
))
2236 SET_VAR_HAD_UNKNOWN_BOUND (newdecl
);
2239 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2243 /* Merge parameter attributes. */
2244 tree oldarg
, newarg
;
2245 for (oldarg
= DECL_ARGUMENTS(olddecl
),
2246 newarg
= DECL_ARGUMENTS(newdecl
);
2248 oldarg
= DECL_CHAIN(oldarg
), newarg
= DECL_CHAIN(newarg
)) {
2249 DECL_ATTRIBUTES (newarg
)
2250 = (*targetm
.merge_decl_attributes
) (oldarg
, newarg
);
2251 DECL_ATTRIBUTES (oldarg
) = DECL_ATTRIBUTES (newarg
);
2254 if (DECL_TEMPLATE_INSTANTIATION (olddecl
)
2255 && !DECL_TEMPLATE_INSTANTIATION (newdecl
))
2257 /* If newdecl is not a specialization, then it is not a
2258 template-related function at all. And that means that we
2259 should have exited above, returning 0. */
2260 gcc_assert (DECL_TEMPLATE_SPECIALIZATION (newdecl
));
2262 if (DECL_ODR_USED (olddecl
))
2263 /* From [temp.expl.spec]:
2265 If a template, a member template or the member of a class
2266 template is explicitly specialized then that
2267 specialization shall be declared before the first use of
2268 that specialization that would cause an implicit
2269 instantiation to take place, in every translation unit in
2270 which such a use occurs. */
2271 error ("explicit specialization of %qD after first use",
2274 SET_DECL_TEMPLATE_SPECIALIZATION (olddecl
);
2275 DECL_COMDAT (newdecl
) = (TREE_PUBLIC (newdecl
)
2276 && DECL_DECLARED_INLINE_P (newdecl
));
2278 /* Don't propagate visibility from the template to the
2279 specialization here. We'll do that in determine_visibility if
2281 DECL_VISIBILITY_SPECIFIED (olddecl
) = 0;
2283 /* [temp.expl.spec/14] We don't inline explicit specialization
2284 just because the primary template says so. */
2286 /* But still keep DECL_DISREGARD_INLINE_LIMITS in sync with
2287 the always_inline attribute. */
2288 if (DECL_DISREGARD_INLINE_LIMITS (olddecl
)
2289 && !DECL_DISREGARD_INLINE_LIMITS (newdecl
))
2291 if (DECL_DECLARED_INLINE_P (newdecl
))
2292 DECL_DISREGARD_INLINE_LIMITS (newdecl
) = true;
2294 DECL_ATTRIBUTES (newdecl
)
2295 = remove_attribute ("always_inline",
2296 DECL_ATTRIBUTES (newdecl
));
2299 else if (new_defines_function
&& DECL_INITIAL (olddecl
))
2301 /* Never inline re-defined extern inline functions.
2302 FIXME: this could be better handled by keeping both
2303 function as separate declarations. */
2304 DECL_UNINLINABLE (newdecl
) = 1;
2308 if (DECL_PENDING_INLINE_INFO (newdecl
) == 0)
2309 DECL_PENDING_INLINE_INFO (newdecl
) = DECL_PENDING_INLINE_INFO (olddecl
);
2311 DECL_DECLARED_INLINE_P (newdecl
) |= DECL_DECLARED_INLINE_P (olddecl
);
2313 DECL_UNINLINABLE (newdecl
) = DECL_UNINLINABLE (olddecl
)
2314 = (DECL_UNINLINABLE (newdecl
) || DECL_UNINLINABLE (olddecl
));
2316 DECL_DISREGARD_INLINE_LIMITS (newdecl
)
2317 = DECL_DISREGARD_INLINE_LIMITS (olddecl
)
2318 = (DECL_DISREGARD_INLINE_LIMITS (newdecl
)
2319 || DECL_DISREGARD_INLINE_LIMITS (olddecl
));
2322 /* Preserve abstractness on cloned [cd]tors. */
2323 DECL_ABSTRACT_P (newdecl
) = DECL_ABSTRACT_P (olddecl
);
2325 /* Update newdecl's parms to point at olddecl. */
2326 for (parm
= DECL_ARGUMENTS (newdecl
); parm
;
2327 parm
= DECL_CHAIN (parm
))
2328 DECL_CONTEXT (parm
) = olddecl
;
2332 SET_DECL_LANGUAGE (olddecl
, DECL_LANGUAGE (newdecl
));
2333 COPY_DECL_ASSEMBLER_NAME (newdecl
, olddecl
);
2334 COPY_DECL_RTL (newdecl
, olddecl
);
2336 if (! types_match
|| new_defines_function
)
2338 /* These need to be copied so that the names are available.
2339 Note that if the types do match, we'll preserve inline
2340 info and other bits, but if not, we won't. */
2341 DECL_ARGUMENTS (olddecl
) = DECL_ARGUMENTS (newdecl
);
2342 DECL_RESULT (olddecl
) = DECL_RESULT (newdecl
);
2344 /* If redeclaring a builtin function, it stays built in
2345 if newdecl is a gnu_inline definition, or if newdecl is just
2347 if (DECL_BUILT_IN (olddecl
)
2348 && (new_defines_function
? GNU_INLINE_P (newdecl
) : types_match
))
2350 DECL_BUILT_IN_CLASS (newdecl
) = DECL_BUILT_IN_CLASS (olddecl
);
2351 DECL_FUNCTION_CODE (newdecl
) = DECL_FUNCTION_CODE (olddecl
);
2352 /* If we're keeping the built-in definition, keep the rtl,
2353 regardless of declaration matches. */
2354 COPY_DECL_RTL (olddecl
, newdecl
);
2355 if (DECL_BUILT_IN_CLASS (newdecl
) == BUILT_IN_NORMAL
)
2357 enum built_in_function fncode
= DECL_FUNCTION_CODE (newdecl
);
2360 /* If a compatible prototype of these builtin functions
2361 is seen, assume the runtime implements it with the
2362 expected semantics. */
2363 case BUILT_IN_STPCPY
:
2364 if (builtin_decl_explicit_p (fncode
))
2365 set_builtin_decl_implicit_p (fncode
, true);
2368 if (builtin_decl_explicit_p (fncode
))
2369 set_builtin_decl_declared_p (fncode
, true);
2374 if (new_defines_function
)
2375 /* If defining a function declared with other language
2376 linkage, use the previously declared language linkage. */
2377 SET_DECL_LANGUAGE (newdecl
, DECL_LANGUAGE (olddecl
));
2378 else if (types_match
)
2380 DECL_RESULT (newdecl
) = DECL_RESULT (olddecl
);
2381 /* Don't clear out the arguments if we're just redeclaring a
2383 if (DECL_ARGUMENTS (olddecl
))
2384 DECL_ARGUMENTS (newdecl
) = DECL_ARGUMENTS (olddecl
);
2387 else if (TREE_CODE (newdecl
) == NAMESPACE_DECL
)
2388 NAMESPACE_LEVEL (newdecl
) = NAMESPACE_LEVEL (olddecl
);
2390 /* Now preserve various other info from the definition. */
2391 TREE_ADDRESSABLE (newdecl
) = TREE_ADDRESSABLE (olddecl
);
2392 TREE_ASM_WRITTEN (newdecl
) = TREE_ASM_WRITTEN (olddecl
);
2393 DECL_COMMON (newdecl
) = DECL_COMMON (olddecl
);
2394 COPY_DECL_ASSEMBLER_NAME (olddecl
, newdecl
);
2396 /* Warn about conflicting visibility specifications. */
2397 if (DECL_VISIBILITY_SPECIFIED (olddecl
)
2398 && DECL_VISIBILITY_SPECIFIED (newdecl
)
2399 && DECL_VISIBILITY (newdecl
) != DECL_VISIBILITY (olddecl
))
2401 if (warning_at (DECL_SOURCE_LOCATION (newdecl
), OPT_Wattributes
,
2402 "%qD: visibility attribute ignored because it "
2403 "conflicts with previous declaration", newdecl
))
2404 inform (DECL_SOURCE_LOCATION (olddecl
),
2405 "previous declaration of %qD", olddecl
);
2407 /* Choose the declaration which specified visibility. */
2408 if (DECL_VISIBILITY_SPECIFIED (olddecl
))
2410 DECL_VISIBILITY (newdecl
) = DECL_VISIBILITY (olddecl
);
2411 DECL_VISIBILITY_SPECIFIED (newdecl
) = 1;
2413 /* Init priority used to be merged from newdecl to olddecl by the memcpy,
2414 so keep this behavior. */
2415 if (VAR_P (newdecl
) && DECL_HAS_INIT_PRIORITY_P (newdecl
))
2417 SET_DECL_INIT_PRIORITY (olddecl
, DECL_INIT_PRIORITY (newdecl
));
2418 DECL_HAS_INIT_PRIORITY_P (olddecl
) = 1;
2420 /* Likewise for DECL_ALIGN, DECL_USER_ALIGN and DECL_PACKED. */
2421 if (DECL_ALIGN (olddecl
) > DECL_ALIGN (newdecl
))
2423 DECL_ALIGN (newdecl
) = DECL_ALIGN (olddecl
);
2424 DECL_USER_ALIGN (newdecl
) |= DECL_USER_ALIGN (olddecl
);
2426 DECL_USER_ALIGN (olddecl
) = DECL_USER_ALIGN (newdecl
);
2427 if (TREE_CODE (newdecl
) == FIELD_DECL
)
2428 DECL_PACKED (olddecl
) = DECL_PACKED (newdecl
);
2430 /* The DECL_LANG_SPECIFIC information in OLDDECL will be replaced
2431 with that from NEWDECL below. */
2432 if (DECL_LANG_SPECIFIC (olddecl
))
2434 gcc_assert (DECL_LANG_SPECIFIC (olddecl
)
2435 != DECL_LANG_SPECIFIC (newdecl
));
2436 ggc_free (DECL_LANG_SPECIFIC (olddecl
));
2439 /* Merge the USED information. */
2440 if (TREE_USED (olddecl
))
2441 TREE_USED (newdecl
) = 1;
2442 else if (TREE_USED (newdecl
))
2443 TREE_USED (olddecl
) = 1;
2444 if (VAR_P (newdecl
))
2446 if (DECL_READ_P (olddecl
))
2447 DECL_READ_P (newdecl
) = 1;
2448 else if (DECL_READ_P (newdecl
))
2449 DECL_READ_P (olddecl
) = 1;
2451 if (DECL_PRESERVE_P (olddecl
))
2452 DECL_PRESERVE_P (newdecl
) = 1;
2453 else if (DECL_PRESERVE_P (newdecl
))
2454 DECL_PRESERVE_P (olddecl
) = 1;
2456 /* Merge the DECL_FUNCTION_VERSIONED information. newdecl will be copied
2457 to olddecl and deleted. */
2458 if (TREE_CODE (newdecl
) == FUNCTION_DECL
2459 && DECL_FUNCTION_VERSIONED (olddecl
))
2461 /* Set the flag for newdecl so that it gets copied to olddecl. */
2462 DECL_FUNCTION_VERSIONED (newdecl
) = 1;
2463 /* newdecl will be purged after copying to olddecl and is no longer
2465 cgraph_node::delete_function_version (newdecl
);
2468 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2471 struct symtab_node
*snode
= symtab_node::get (olddecl
);
2473 function_size
= sizeof (struct tree_decl_common
);
2475 memcpy ((char *) olddecl
+ sizeof (struct tree_common
),
2476 (char *) newdecl
+ sizeof (struct tree_common
),
2477 function_size
- sizeof (struct tree_common
));
2479 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
2480 (char *) newdecl
+ sizeof (struct tree_decl_common
),
2481 sizeof (struct tree_function_decl
) - sizeof (struct tree_decl_common
));
2483 /* Preserve symtab node mapping. */
2484 olddecl
->decl_with_vis
.symtab_node
= snode
;
2486 if (new_template_info
)
2487 /* If newdecl is a template instantiation, it is possible that
2488 the following sequence of events has occurred:
2490 o A friend function was declared in a class template. The
2491 class template was instantiated.
2493 o The instantiation of the friend declaration was
2494 recorded on the instantiation list, and is newdecl.
2496 o Later, however, instantiate_class_template called pushdecl
2497 on the newdecl to perform name injection. But, pushdecl in
2498 turn called duplicate_decls when it discovered that another
2499 declaration of a global function with the same name already
2502 o Here, in duplicate_decls, we decided to clobber newdecl.
2504 If we're going to do that, we'd better make sure that
2505 olddecl, and not newdecl, is on the list of
2506 instantiations so that if we try to do the instantiation
2507 again we won't get the clobbered declaration. */
2508 reregister_specialization (newdecl
,
2514 size_t size
= tree_code_size (TREE_CODE (newdecl
));
2516 memcpy ((char *) olddecl
+ sizeof (struct tree_common
),
2517 (char *) newdecl
+ sizeof (struct tree_common
),
2518 sizeof (struct tree_decl_common
) - sizeof (struct tree_common
));
2519 switch (TREE_CODE (newdecl
))
2529 struct symtab_node
*snode
= NULL
;
2532 && (TREE_STATIC (olddecl
) || TREE_PUBLIC (olddecl
)
2533 || DECL_EXTERNAL (olddecl
)))
2534 snode
= symtab_node::get (olddecl
);
2535 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
2536 (char *) newdecl
+ sizeof (struct tree_decl_common
),
2537 size
- sizeof (struct tree_decl_common
)
2538 + TREE_CODE_LENGTH (TREE_CODE (newdecl
)) * sizeof (char *));
2539 if (VAR_P (newdecl
))
2540 olddecl
->decl_with_vis
.symtab_node
= snode
;
2544 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
2545 (char *) newdecl
+ sizeof (struct tree_decl_common
),
2546 sizeof (struct tree_decl_non_common
) - sizeof (struct tree_decl_common
)
2547 + TREE_CODE_LENGTH (TREE_CODE (newdecl
)) * sizeof (char *));
2552 if (VAR_OR_FUNCTION_DECL_P (newdecl
))
2554 if (DECL_EXTERNAL (olddecl
)
2555 || TREE_PUBLIC (olddecl
)
2556 || TREE_STATIC (olddecl
))
2558 /* Merge the section attribute.
2559 We want to issue an error if the sections conflict but that must be
2560 done later in decl_attributes since we are called before attributes
2562 if (DECL_SECTION_NAME (newdecl
) != NULL
)
2563 set_decl_section_name (olddecl
, DECL_SECTION_NAME (newdecl
));
2565 if (DECL_ONE_ONLY (newdecl
))
2567 struct symtab_node
*oldsym
, *newsym
;
2568 if (TREE_CODE (olddecl
) == FUNCTION_DECL
)
2569 oldsym
= cgraph_node::get_create (olddecl
);
2571 oldsym
= varpool_node::get_create (olddecl
);
2572 newsym
= symtab_node::get (newdecl
);
2573 oldsym
->set_comdat_group (newsym
->get_comdat_group ());
2578 && CP_DECL_THREAD_LOCAL_P (newdecl
))
2580 CP_DECL_THREAD_LOCAL_P (olddecl
) = true;
2581 if (!processing_template_decl
)
2582 set_decl_tls_model (olddecl
, DECL_TLS_MODEL (newdecl
));
2586 DECL_UID (olddecl
) = olddecl_uid
;
2588 DECL_FRIEND_P (olddecl
) = 1;
2591 DECL_ANTICIPATED (olddecl
) = 1;
2592 DECL_HIDDEN_FRIEND_P (olddecl
) = 1;
2595 /* NEWDECL contains the merged attribute lists.
2596 Update OLDDECL to be the same. */
2597 DECL_ATTRIBUTES (olddecl
) = DECL_ATTRIBUTES (newdecl
);
2599 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2600 so that encode_section_info has a chance to look at the new decl
2601 flags and attributes. */
2602 if (DECL_RTL_SET_P (olddecl
)
2603 && (TREE_CODE (olddecl
) == FUNCTION_DECL
2605 && TREE_STATIC (olddecl
))))
2606 make_decl_rtl (olddecl
);
2608 /* The NEWDECL will no longer be needed. Because every out-of-class
2609 declaration of a member results in a call to duplicate_decls,
2610 freeing these nodes represents in a significant savings.
2612 Before releasing the node, be sore to remove function from symbol
2613 table that might have been inserted there to record comdat group.
2614 Be sure to however do not free DECL_STRUCT_FUNCTION becuase this
2615 structure is shared in between newdecl and oldecl. */
2616 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2617 DECL_STRUCT_FUNCTION (newdecl
) = NULL
;
2618 if (VAR_OR_FUNCTION_DECL_P (newdecl
))
2620 struct symtab_node
*snode
= symtab_node::get (newdecl
);
2625 /* Remove the associated constraints for newdecl, if any, before
2626 reclaiming memory. */
2628 remove_constraints (newdecl
);
2635 /* Return zero if the declaration NEWDECL is valid
2636 when the declaration OLDDECL (assumed to be for the same name)
2637 has already been seen.
2638 Otherwise return an error message format string with a %s
2639 where the identifier should go. */
2642 redeclaration_error_message (tree newdecl
, tree olddecl
)
2644 if (TREE_CODE (newdecl
) == TYPE_DECL
)
2646 /* Because C++ can put things into name space for free,
2647 constructs like "typedef struct foo { ... } foo"
2648 would look like an erroneous redeclaration. */
2649 if (same_type_p (TREE_TYPE (newdecl
), TREE_TYPE (olddecl
)))
2652 return G_("redefinition of %q#D");
2654 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2656 /* If this is a pure function, its olddecl will actually be
2657 the original initialization to `0' (which we force to call
2658 abort()). Don't complain about redefinition in this case. */
2659 if (DECL_LANG_SPECIFIC (olddecl
) && DECL_PURE_VIRTUAL_P (olddecl
)
2660 && DECL_INITIAL (olddecl
) == NULL_TREE
)
2663 /* If both functions come from different namespaces, this is not
2664 a redeclaration - this is a conflict with a used function. */
2665 if (DECL_NAMESPACE_SCOPE_P (olddecl
)
2666 && DECL_CONTEXT (olddecl
) != DECL_CONTEXT (newdecl
)
2667 && ! decls_match (olddecl
, newdecl
))
2668 return G_("%qD conflicts with used function");
2670 /* We'll complain about linkage mismatches in
2671 warn_extern_redeclared_static. */
2673 /* Defining the same name twice is no good. */
2674 if (DECL_INITIAL (olddecl
) != NULL_TREE
2675 && DECL_INITIAL (newdecl
) != NULL_TREE
)
2677 if (DECL_NAME (olddecl
) == NULL_TREE
)
2678 return G_("%q#D not declared in class");
2679 else if (!GNU_INLINE_P (olddecl
)
2680 || GNU_INLINE_P (newdecl
))
2681 return G_("redefinition of %q#D");
2684 if (DECL_DECLARED_INLINE_P (olddecl
) && DECL_DECLARED_INLINE_P (newdecl
))
2686 bool olda
= GNU_INLINE_P (olddecl
);
2687 bool newa
= GNU_INLINE_P (newdecl
);
2692 return G_("%q+D redeclared inline with "
2693 "%<gnu_inline%> attribute");
2695 return G_("%q+D redeclared inline without "
2696 "%<gnu_inline%> attribute");
2700 check_abi_tag_redeclaration
2701 (olddecl
, lookup_attribute ("abi_tag", DECL_ATTRIBUTES (olddecl
)),
2702 lookup_attribute ("abi_tag", DECL_ATTRIBUTES (newdecl
)));
2706 else if (TREE_CODE (newdecl
) == TEMPLATE_DECL
)
2710 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl
)) == TYPE_DECL
)
2712 if (COMPLETE_TYPE_P (TREE_TYPE (newdecl
))
2713 && COMPLETE_TYPE_P (TREE_TYPE (olddecl
)))
2714 return G_("redefinition of %q#D");
2718 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl
)) != FUNCTION_DECL
2719 || (DECL_TEMPLATE_RESULT (newdecl
)
2720 == DECL_TEMPLATE_RESULT (olddecl
)))
2723 nt
= DECL_TEMPLATE_RESULT (newdecl
);
2724 if (DECL_TEMPLATE_INFO (nt
))
2725 nt
= DECL_TEMPLATE_RESULT (template_for_substitution (nt
));
2726 ot
= DECL_TEMPLATE_RESULT (olddecl
);
2727 if (DECL_TEMPLATE_INFO (ot
))
2728 ot
= DECL_TEMPLATE_RESULT (template_for_substitution (ot
));
2729 if (DECL_INITIAL (nt
) && DECL_INITIAL (ot
)
2730 && (!GNU_INLINE_P (ot
) || GNU_INLINE_P (nt
)))
2731 return G_("redefinition of %q#D");
2733 if (DECL_DECLARED_INLINE_P (ot
) && DECL_DECLARED_INLINE_P (nt
))
2735 bool olda
= GNU_INLINE_P (ot
);
2736 bool newa
= GNU_INLINE_P (nt
);
2741 return G_("%q+D redeclared inline with "
2742 "%<gnu_inline%> attribute");
2744 return G_("%q+D redeclared inline without "
2745 "%<gnu_inline%> attribute");
2749 /* Core issue #226 (C++0x):
2751 If a friend function template declaration specifies a
2752 default template-argument, that declaration shall be a
2753 definition and shall be the only declaration of the
2754 function template in the translation unit. */
2755 if ((cxx_dialect
!= cxx98
)
2756 && TREE_CODE (ot
) == FUNCTION_DECL
&& DECL_FRIEND_P (ot
)
2757 && !check_default_tmpl_args (nt
, DECL_TEMPLATE_PARMS (newdecl
),
2758 /*is_primary=*/true,
2759 /*is_partial=*/false,
2760 /*is_friend_decl=*/2))
2761 return G_("redeclaration of friend %q#D "
2762 "may not have default template arguments");
2766 else if (VAR_P (newdecl
)
2767 && CP_DECL_THREAD_LOCAL_P (newdecl
) != CP_DECL_THREAD_LOCAL_P (olddecl
)
2768 && (! DECL_LANG_SPECIFIC (olddecl
)
2769 || ! CP_DECL_THREADPRIVATE_P (olddecl
)
2770 || CP_DECL_THREAD_LOCAL_P (newdecl
)))
2772 /* Only variables can be thread-local, and all declarations must
2773 agree on this property. */
2774 if (CP_DECL_THREAD_LOCAL_P (newdecl
))
2775 return G_("thread-local declaration of %q#D follows "
2776 "non-thread-local declaration");
2778 return G_("non-thread-local declaration of %q#D follows "
2779 "thread-local declaration");
2781 else if (toplevel_bindings_p () || DECL_NAMESPACE_SCOPE_P (newdecl
))
2783 /* The objects have been declared at namespace scope. If either
2784 is a member of an anonymous union, then this is an invalid
2785 redeclaration. For example:
2791 if ((VAR_P (newdecl
) && DECL_ANON_UNION_VAR_P (newdecl
))
2792 || (VAR_P (olddecl
) && DECL_ANON_UNION_VAR_P (olddecl
)))
2793 return G_("redeclaration of %q#D");
2794 /* If at least one declaration is a reference, there is no
2795 conflict. For example:
2801 if (DECL_EXTERNAL (newdecl
) || DECL_EXTERNAL (olddecl
))
2803 /* Reject two definitions. */
2804 return G_("redefinition of %q#D");
2808 /* Objects declared with block scope: */
2809 /* Reject two definitions, and reject a definition
2810 together with an external reference. */
2811 if (!(DECL_EXTERNAL (newdecl
) && DECL_EXTERNAL (olddecl
)))
2812 return G_("redeclaration of %q#D");
2817 /* Hash and equality functions for the named_label table. */
2820 named_label_hasher::hash (named_label_entry
*ent
)
2822 return DECL_UID (ent
->label_decl
);
2826 named_label_hasher::equal (named_label_entry
*a
, named_label_entry
*b
)
2828 return a
->label_decl
== b
->label_decl
;
2831 /* Create a new label, named ID. */
2834 make_label_decl (tree id
, int local_p
)
2836 struct named_label_entry
*ent
;
2839 decl
= build_decl (input_location
, LABEL_DECL
, id
, void_type_node
);
2841 DECL_CONTEXT (decl
) = current_function_decl
;
2842 DECL_MODE (decl
) = VOIDmode
;
2843 C_DECLARED_LABEL_FLAG (decl
) = local_p
;
2845 /* Say where one reference is to the label, for the sake of the
2846 error if it is not defined. */
2847 DECL_SOURCE_LOCATION (decl
) = input_location
;
2849 /* Record the fact that this identifier is bound to this label. */
2850 SET_IDENTIFIER_LABEL_VALUE (id
, decl
);
2852 /* Create the label htab for the function on demand. */
2854 named_labels
= hash_table
<named_label_hasher
>::create_ggc (13);
2856 /* Record this label on the list of labels used in this function.
2857 We do this before calling make_label_decl so that we get the
2858 IDENTIFIER_LABEL_VALUE before the new label is declared. */
2859 ent
= ggc_cleared_alloc
<named_label_entry
> ();
2860 ent
->label_decl
= decl
;
2862 named_label_entry
**slot
= named_labels
->find_slot (ent
, INSERT
);
2863 gcc_assert (*slot
== NULL
);
2869 /* Look for a label named ID in the current function. If one cannot
2870 be found, create one. (We keep track of used, but undefined,
2871 labels, and complain about them at the end of a function.) */
2874 lookup_label_1 (tree id
)
2878 /* You can't use labels at global scope. */
2879 if (current_function_decl
== NULL_TREE
)
2881 error ("label %qE referenced outside of any function", id
);
2885 /* See if we've already got this label. */
2886 decl
= IDENTIFIER_LABEL_VALUE (id
);
2887 if (decl
!= NULL_TREE
&& DECL_CONTEXT (decl
) == current_function_decl
)
2890 decl
= make_label_decl (id
, /*local_p=*/0);
2894 /* Wrapper for lookup_label_1. */
2897 lookup_label (tree id
)
2900 bool subtime
= timevar_cond_start (TV_NAME_LOOKUP
);
2901 ret
= lookup_label_1 (id
);
2902 timevar_cond_stop (TV_NAME_LOOKUP
, subtime
);
2906 /* Declare a local label named ID. */
2909 declare_local_label (tree id
)
2912 cp_label_binding bind
;
2914 /* Add a new entry to the SHADOWED_LABELS list so that when we leave
2915 this scope we can restore the old value of IDENTIFIER_TYPE_VALUE. */
2916 bind
.prev_value
= IDENTIFIER_LABEL_VALUE (id
);
2918 decl
= make_label_decl (id
, /*local_p=*/1);
2920 vec_safe_push (current_binding_level
->shadowed_labels
, bind
);
2925 /* Returns nonzero if it is ill-formed to jump past the declaration of
2926 DECL. Returns 2 if it's also a real problem. */
2929 decl_jump_unsafe (tree decl
)
2931 /* [stmt.dcl]/3: A program that jumps from a point where a local variable
2932 with automatic storage duration is not in scope to a point where it is
2933 in scope is ill-formed unless the variable has scalar type, class type
2934 with a trivial default constructor and a trivial destructor, a
2935 cv-qualified version of one of these types, or an array of one of the
2936 preceding types and is declared without an initializer (8.5). */
2937 tree type
= TREE_TYPE (decl
);
2939 if (!VAR_P (decl
) || TREE_STATIC (decl
)
2940 || type
== error_mark_node
)
2943 if (DECL_NONTRIVIALLY_INITIALIZED_P (decl
)
2944 || variably_modified_type_p (type
, NULL_TREE
))
2947 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type
))
2953 /* A subroutine of check_previous_goto_1 to identify a branch to the user. */
2956 identify_goto (tree decl
, const location_t
*locus
)
2958 bool complained
= (decl
2959 ? permerror (input_location
, "jump to label %qD", decl
)
2960 : permerror (input_location
, "jump to case label"));
2961 if (complained
&& locus
)
2962 inform (*locus
, " from here");
2966 /* Check that a single previously seen jump to a newly defined label
2967 is OK. DECL is the LABEL_DECL or 0; LEVEL is the binding_level for
2968 the jump context; NAMES are the names in scope in LEVEL at the jump
2969 context; LOCUS is the source position of the jump or 0. Returns
2970 true if all is well. */
2973 check_previous_goto_1 (tree decl
, cp_binding_level
* level
, tree names
,
2974 bool exited_omp
, const location_t
*locus
)
2976 cp_binding_level
*b
;
2977 bool identified
= false, complained
= false;
2978 bool saw_eh
= false, saw_omp
= false;
2982 complained
= identify_goto (decl
, locus
);
2984 inform (input_location
, " exits OpenMP structured block");
2985 identified
= saw_omp
= true;
2988 for (b
= current_binding_level
; b
; b
= b
->level_chain
)
2990 tree new_decls
, old_decls
= (b
== level
? names
: NULL_TREE
);
2992 for (new_decls
= b
->names
; new_decls
!= old_decls
;
2993 new_decls
= (DECL_P (new_decls
) ? DECL_CHAIN (new_decls
)
2994 : TREE_CHAIN (new_decls
)))
2996 int problem
= decl_jump_unsafe (new_decls
);
3002 complained
= identify_goto (decl
, locus
);
3008 inform (DECL_SOURCE_LOCATION (new_decls
),
3009 " crosses initialization of %q#D", new_decls
);
3011 inform (DECL_SOURCE_LOCATION (new_decls
),
3012 " enters scope of %q#D which has "
3013 "non-trivial destructor", new_decls
);
3019 if ((b
->kind
== sk_try
|| b
->kind
== sk_catch
) && !saw_eh
)
3023 complained
= identify_goto (decl
, locus
);
3028 if (b
->kind
== sk_try
)
3029 inform (input_location
, " enters try block");
3031 inform (input_location
, " enters catch block");
3035 if (b
->kind
== sk_omp
&& !saw_omp
)
3039 complained
= identify_goto (decl
, locus
);
3043 inform (input_location
, " enters OpenMP structured block");
3052 check_previous_goto (tree decl
, struct named_label_use_entry
*use
)
3054 check_previous_goto_1 (decl
, use
->binding_level
,
3055 use
->names_in_scope
, use
->in_omp_scope
,
3056 &use
->o_goto_locus
);
3060 check_switch_goto (cp_binding_level
* level
)
3062 return check_previous_goto_1 (NULL_TREE
, level
, level
->names
, false, NULL
);
3065 /* Check that a new jump to a label DECL is OK. Called by
3066 finish_goto_stmt. */
3069 check_goto (tree decl
)
3071 struct named_label_entry
*ent
, dummy
;
3072 bool saw_catch
= false, identified
= false, complained
= false;
3076 /* We can't know where a computed goto is jumping.
3077 So we assume that it's OK. */
3078 if (TREE_CODE (decl
) != LABEL_DECL
)
3081 /* We didn't record any information about this label when we created it,
3082 and there's not much point since it's trivial to analyze as a return. */
3083 if (decl
== cdtor_label
)
3086 dummy
.label_decl
= decl
;
3087 ent
= named_labels
->find (&dummy
);
3088 gcc_assert (ent
!= NULL
);
3090 /* If the label hasn't been defined yet, defer checking. */
3091 if (! DECL_INITIAL (decl
))
3093 struct named_label_use_entry
*new_use
;
3095 /* Don't bother creating another use if the last goto had the
3096 same data, and will therefore create the same set of errors. */
3098 && ent
->uses
->names_in_scope
== current_binding_level
->names
)
3101 new_use
= ggc_alloc
<named_label_use_entry
> ();
3102 new_use
->binding_level
= current_binding_level
;
3103 new_use
->names_in_scope
= current_binding_level
->names
;
3104 new_use
->o_goto_locus
= input_location
;
3105 new_use
->in_omp_scope
= false;
3107 new_use
->next
= ent
->uses
;
3108 ent
->uses
= new_use
;
3112 if (ent
->in_try_scope
|| ent
->in_catch_scope
3113 || ent
->in_omp_scope
|| !vec_safe_is_empty (ent
->bad_decls
))
3115 complained
= permerror (DECL_SOURCE_LOCATION (decl
),
3116 "jump to label %qD", decl
);
3118 inform (input_location
, " from here");
3122 FOR_EACH_VEC_SAFE_ELT (ent
->bad_decls
, ix
, bad
)
3124 int u
= decl_jump_unsafe (bad
);
3126 if (u
> 1 && DECL_ARTIFICIAL (bad
))
3128 /* Can't skip init of __exception_info. */
3130 inform (DECL_SOURCE_LOCATION (bad
), " enters catch block");
3133 else if (complained
)
3136 inform (DECL_SOURCE_LOCATION (bad
),
3137 " skips initialization of %q#D", bad
);
3139 inform (DECL_SOURCE_LOCATION (bad
),
3140 " enters scope of %q#D which has "
3141 "non-trivial destructor", bad
);
3147 if (ent
->in_try_scope
)
3148 inform (input_location
, " enters try block");
3149 else if (ent
->in_catch_scope
&& !saw_catch
)
3150 inform (input_location
, " enters catch block");
3153 if (ent
->in_omp_scope
)
3156 inform (input_location
, " enters OpenMP structured block");
3158 else if (flag_openmp
)
3160 cp_binding_level
*b
;
3161 for (b
= current_binding_level
; b
; b
= b
->level_chain
)
3163 if (b
== ent
->binding_level
)
3165 if (b
->kind
== sk_omp
)
3169 complained
= permerror (DECL_SOURCE_LOCATION (decl
),
3170 "jump to label %qD", decl
);
3172 inform (input_location
, " from here");
3176 inform (input_location
, " exits OpenMP structured block");
3183 /* Check that a return is ok wrt OpenMP structured blocks.
3184 Called by finish_return_stmt. Returns true if all is well. */
3187 check_omp_return (void)
3189 cp_binding_level
*b
;
3190 for (b
= current_binding_level
; b
; b
= b
->level_chain
)
3191 if (b
->kind
== sk_omp
)
3193 error ("invalid exit from OpenMP structured block");
3196 else if (b
->kind
== sk_function_parms
)
3201 /* Define a label, specifying the location in the source file.
3202 Return the LABEL_DECL node for the label. */
3205 define_label_1 (location_t location
, tree name
)
3207 struct named_label_entry
*ent
, dummy
;
3208 cp_binding_level
*p
;
3211 decl
= lookup_label (name
);
3213 dummy
.label_decl
= decl
;
3214 ent
= named_labels
->find (&dummy
);
3215 gcc_assert (ent
!= NULL
);
3217 /* After labels, make any new cleanups in the function go into their
3218 own new (temporary) binding contour. */
3219 for (p
= current_binding_level
;
3220 p
->kind
!= sk_function_parms
;
3222 p
->more_cleanups_ok
= 0;
3224 if (name
== get_identifier ("wchar_t"))
3225 permerror (input_location
, "label named wchar_t");
3227 if (DECL_INITIAL (decl
) != NULL_TREE
)
3229 error ("duplicate label %qD", decl
);
3230 return error_mark_node
;
3234 struct named_label_use_entry
*use
;
3236 /* Mark label as having been defined. */
3237 DECL_INITIAL (decl
) = error_mark_node
;
3238 /* Say where in the source. */
3239 DECL_SOURCE_LOCATION (decl
) = location
;
3241 ent
->binding_level
= current_binding_level
;
3242 ent
->names_in_scope
= current_binding_level
->names
;
3244 for (use
= ent
->uses
; use
; use
= use
->next
)
3245 check_previous_goto (decl
, use
);
3252 /* Wrapper for define_label_1. */
3255 define_label (location_t location
, tree name
)
3258 bool running
= timevar_cond_start (TV_NAME_LOOKUP
);
3259 ret
= define_label_1 (location
, name
);
3260 timevar_cond_stop (TV_NAME_LOOKUP
, running
);
3267 cp_binding_level
*level
;
3268 struct cp_switch
*next
;
3269 /* The SWITCH_STMT being built. */
3271 /* A splay-tree mapping the low element of a case range to the high
3272 element, or NULL_TREE if there is no high element. Used to
3273 determine whether or not a new case label duplicates an old case
3274 label. We need a tree, rather than simply a hash table, because
3275 of the GNU case range extension. */
3277 /* Remember whether there was a case value that is outside the
3278 range of the original type of the controlling expression. */
3279 bool outside_range_p
;
3282 /* A stack of the currently active switch statements. The innermost
3283 switch statement is on the top of the stack. There is no need to
3284 mark the stack for garbage collection because it is only active
3285 during the processing of the body of a function, and we never
3286 collect at that point. */
3288 static struct cp_switch
*switch_stack
;
3290 /* Called right after a switch-statement condition is parsed.
3291 SWITCH_STMT is the switch statement being parsed. */
3294 push_switch (tree switch_stmt
)
3296 struct cp_switch
*p
= XNEW (struct cp_switch
);
3297 p
->level
= current_binding_level
;
3298 p
->next
= switch_stack
;
3299 p
->switch_stmt
= switch_stmt
;
3300 p
->cases
= splay_tree_new (case_compare
, NULL
, NULL
);
3301 p
->outside_range_p
= false;
3308 struct cp_switch
*cs
= switch_stack
;
3309 location_t switch_location
;
3311 /* Emit warnings as needed. */
3312 switch_location
= EXPR_LOC_OR_LOC (cs
->switch_stmt
, input_location
);
3313 const bool bool_cond_p
3314 = (SWITCH_STMT_TYPE (cs
->switch_stmt
)
3315 && TREE_CODE (SWITCH_STMT_TYPE (cs
->switch_stmt
)) == BOOLEAN_TYPE
);
3316 if (!processing_template_decl
)
3317 c_do_switch_warnings (cs
->cases
, switch_location
,
3318 SWITCH_STMT_TYPE (cs
->switch_stmt
),
3319 SWITCH_STMT_COND (cs
->switch_stmt
),
3320 bool_cond_p
, cs
->outside_range_p
);
3322 splay_tree_delete (cs
->cases
);
3323 switch_stack
= switch_stack
->next
;
3327 /* Convert a case constant VALUE in a switch to the type TYPE of the switch
3328 condition. Note that if TYPE and VALUE are already integral we don't
3329 really do the conversion because the language-independent
3330 warning/optimization code will work better that way. */
3333 case_conversion (tree type
, tree value
)
3335 if (value
== NULL_TREE
)
3338 if (cxx_dialect
>= cxx11
3339 && (SCOPED_ENUM_P (type
)
3340 || !INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (value
))))
3342 if (INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type
))
3343 type
= type_promotes_to (type
);
3344 value
= (perform_implicit_conversion_flags
3345 (type
, value
, tf_warning_or_error
,
3346 LOOKUP_IMPLICIT
| LOOKUP_NO_NON_INTEGRAL
));
3348 return cxx_constant_value (value
);
3351 /* Note that we've seen a definition of a case label, and complain if this
3352 is a bad place for one. */
3355 finish_case_label (location_t loc
, tree low_value
, tree high_value
)
3358 cp_binding_level
*p
;
3361 if (processing_template_decl
)
3365 /* For templates, just add the case label; we'll do semantic
3366 analysis at instantiation-time. */
3367 label
= build_decl (loc
, LABEL_DECL
, NULL_TREE
, NULL_TREE
);
3368 return add_stmt (build_case_label (low_value
, high_value
, label
));
3371 /* Find the condition on which this switch statement depends. */
3372 cond
= SWITCH_STMT_COND (switch_stack
->switch_stmt
);
3373 if (cond
&& TREE_CODE (cond
) == TREE_LIST
)
3374 cond
= TREE_VALUE (cond
);
3376 if (!check_switch_goto (switch_stack
->level
))
3377 return error_mark_node
;
3379 type
= SWITCH_STMT_TYPE (switch_stack
->switch_stmt
);
3381 low_value
= case_conversion (type
, low_value
);
3382 high_value
= case_conversion (type
, high_value
);
3384 r
= c_add_case_label (loc
, switch_stack
->cases
, cond
, type
,
3385 low_value
, high_value
,
3386 &switch_stack
->outside_range_p
);
3388 /* After labels, make any new cleanups in the function go into their
3389 own new (temporary) binding contour. */
3390 for (p
= current_binding_level
;
3391 p
->kind
!= sk_function_parms
;
3393 p
->more_cleanups_ok
= 0;
3398 struct typename_info
{
3406 struct typename_hasher
: ggc_ptr_hash
<tree_node
>
3408 typedef typename_info
*compare_type
;
3410 /* Hash a TYPENAME_TYPE. */
3417 hash
= (htab_hash_pointer (TYPE_CONTEXT (t
))
3418 ^ htab_hash_pointer (TYPE_IDENTIFIER (t
)));
3423 /* Compare two TYPENAME_TYPEs. */
3426 equal (tree t1
, const typename_info
*t2
)
3428 return (TYPE_IDENTIFIER (t1
) == t2
->name
3429 && TYPE_CONTEXT (t1
) == t2
->scope
3430 && TYPENAME_TYPE_FULLNAME (t1
) == t2
->template_id
3431 && TYPENAME_IS_ENUM_P (t1
) == t2
->enum_p
3432 && TYPENAME_IS_CLASS_P (t1
) == t2
->class_p
);
3436 /* Build a TYPENAME_TYPE. If the type is `typename T::t', CONTEXT is
3437 the type of `T', NAME is the IDENTIFIER_NODE for `t'.
3439 Returns the new TYPENAME_TYPE. */
3441 static GTY (()) hash_table
<typename_hasher
> *typename_htab
;
3444 build_typename_type (tree context
, tree name
, tree fullname
,
3445 enum tag_types tag_type
)
3453 if (typename_htab
== NULL
)
3454 typename_htab
= hash_table
<typename_hasher
>::create_ggc (61);
3456 ti
.scope
= FROB_CONTEXT (context
);
3458 ti
.template_id
= fullname
;
3459 ti
.enum_p
= tag_type
== enum_type
;
3460 ti
.class_p
= (tag_type
== class_type
3461 || tag_type
== record_type
3462 || tag_type
== union_type
);
3463 hash
= (htab_hash_pointer (ti
.scope
)
3464 ^ htab_hash_pointer (ti
.name
));
3466 /* See if we already have this type. */
3467 e
= typename_htab
->find_slot_with_hash (&ti
, hash
, INSERT
);
3472 /* Build the TYPENAME_TYPE. */
3473 t
= cxx_make_type (TYPENAME_TYPE
);
3474 TYPE_CONTEXT (t
) = ti
.scope
;
3475 TYPENAME_TYPE_FULLNAME (t
) = ti
.template_id
;
3476 TYPENAME_IS_ENUM_P (t
) = ti
.enum_p
;
3477 TYPENAME_IS_CLASS_P (t
) = ti
.class_p
;
3479 /* Build the corresponding TYPE_DECL. */
3480 d
= build_decl (input_location
, TYPE_DECL
, name
, t
);
3481 TYPE_NAME (TREE_TYPE (d
)) = d
;
3482 TYPE_STUB_DECL (TREE_TYPE (d
)) = d
;
3483 DECL_CONTEXT (d
) = FROB_CONTEXT (context
);
3484 DECL_ARTIFICIAL (d
) = 1;
3486 /* Store it in the hash table. */
3489 /* TYPENAME_TYPEs must always be compared structurally, because
3490 they may or may not resolve down to another type depending on
3491 the currently open classes. */
3492 SET_TYPE_STRUCTURAL_EQUALITY (t
);
3498 /* Resolve `typename CONTEXT::NAME'. TAG_TYPE indicates the tag
3499 provided to name the type. Returns an appropriate type, unless an
3500 error occurs, in which case error_mark_node is returned. If we
3501 locate a non-artificial TYPE_DECL and TF_KEEP_TYPE_DECL is set, we
3502 return that, rather than the _TYPE it corresponds to, in other
3503 cases we look through the type decl. If TF_ERROR is set, complain
3504 about errors, otherwise be quiet. */
3507 make_typename_type (tree context
, tree name
, enum tag_types tag_type
,
3508 tsubst_flags_t complain
)
3514 if (name
== error_mark_node
3515 || context
== NULL_TREE
3516 || context
== error_mark_node
)
3517 return error_mark_node
;
3521 if (!(TYPE_LANG_SPECIFIC (name
)
3522 && (CLASSTYPE_IS_TEMPLATE (name
)
3523 || CLASSTYPE_USE_TEMPLATE (name
))))
3524 name
= TYPE_IDENTIFIER (name
);
3526 /* Create a TEMPLATE_ID_EXPR for the type. */
3527 name
= build_nt (TEMPLATE_ID_EXPR
,
3528 CLASSTYPE_TI_TEMPLATE (name
),
3529 CLASSTYPE_TI_ARGS (name
));
3531 else if (TREE_CODE (name
) == TYPE_DECL
)
3532 name
= DECL_NAME (name
);
3536 if (TREE_CODE (name
) == TEMPLATE_ID_EXPR
)
3538 name
= TREE_OPERAND (name
, 0);
3539 if (DECL_TYPE_TEMPLATE_P (name
))
3540 name
= TREE_OPERAND (fullname
, 0) = DECL_NAME (name
);
3541 if (TREE_CODE (name
) != IDENTIFIER_NODE
)
3543 if (complain
& tf_error
)
3544 error ("%qD is not a type", name
);
3545 return error_mark_node
;
3548 if (TREE_CODE (name
) == TEMPLATE_DECL
)
3550 if (complain
& tf_error
)
3551 error ("%qD used without template parameters", name
);
3552 return error_mark_node
;
3554 gcc_assert (identifier_p (name
));
3555 gcc_assert (TYPE_P (context
));
3557 if (!MAYBE_CLASS_TYPE_P (context
))
3559 if (complain
& tf_error
)
3560 error ("%q#T is not a class", context
);
3561 return error_mark_node
;
3564 /* When the CONTEXT is a dependent type, NAME could refer to a
3565 dependent base class of CONTEXT. But look inside it anyway
3566 if CONTEXT is a currently open scope, in case it refers to a
3567 member of the current instantiation or a non-dependent base;
3568 lookup will stop when we hit a dependent base. */
3569 if (!dependent_scope_p (context
))
3570 /* We should only set WANT_TYPE when we're a nested typename type.
3571 Then we can give better diagnostics if we find a non-type. */
3572 t
= lookup_field (context
, name
, 2, /*want_type=*/true);
3576 if ((!t
|| TREE_CODE (t
) == TREE_LIST
) && dependent_type_p (context
))
3577 return build_typename_type (context
, name
, fullname
, tag_type
);
3579 want_template
= TREE_CODE (fullname
) == TEMPLATE_ID_EXPR
;
3583 if (complain
& tf_error
)
3584 error (want_template
? G_("no class template named %q#T in %q#T")
3585 : G_("no type named %q#T in %q#T"), name
, context
);
3586 return error_mark_node
;
3589 /* Pull out the template from an injected-class-name (or multiple). */
3591 t
= maybe_get_template_decl_from_type_decl (t
);
3593 if (TREE_CODE (t
) == TREE_LIST
)
3595 if (complain
& tf_error
)
3597 error ("lookup of %qT in %qT is ambiguous", name
, context
);
3598 print_candidates (t
);
3600 return error_mark_node
;
3603 if (want_template
&& !DECL_TYPE_TEMPLATE_P (t
))
3605 if (complain
& tf_error
)
3606 error ("%<typename %T::%D%> names %q#T, which is not a class template",
3608 return error_mark_node
;
3610 if (!want_template
&& TREE_CODE (t
) != TYPE_DECL
)
3612 if (complain
& tf_error
)
3613 error ("%<typename %T::%D%> names %q#T, which is not a type",
3615 return error_mark_node
;
3618 if (!perform_or_defer_access_check (TYPE_BINFO (context
), t
, t
, complain
))
3619 return error_mark_node
;
3621 /* If we are currently parsing a template and if T is a typedef accessed
3622 through CONTEXT then we need to remember and check access of T at
3623 template instantiation time. */
3624 add_typedef_to_current_template_for_access_check (t
, context
, input_location
);
3627 return lookup_template_class (t
, TREE_OPERAND (fullname
, 1),
3629 /*entering_scope=*/0,
3630 complain
| tf_user
);
3632 if (DECL_ARTIFICIAL (t
) || !(complain
& tf_keep_type_decl
))
3635 maybe_record_typedef_use (t
);
3640 /* Resolve `CONTEXT::template NAME'. Returns a TEMPLATE_DECL if the name
3641 can be resolved or an UNBOUND_CLASS_TEMPLATE, unless an error occurs,
3642 in which case error_mark_node is returned.
3644 If PARM_LIST is non-NULL, also make sure that the template parameter
3645 list of TEMPLATE_DECL matches.
3647 If COMPLAIN zero, don't complain about any errors that occur. */
3650 make_unbound_class_template (tree context
, tree name
, tree parm_list
,
3651 tsubst_flags_t complain
)
3657 name
= TYPE_IDENTIFIER (name
);
3658 else if (DECL_P (name
))
3659 name
= DECL_NAME (name
);
3660 gcc_assert (identifier_p (name
));
3662 if (!dependent_type_p (context
)
3663 || currently_open_class (context
))
3665 tree tmpl
= NULL_TREE
;
3667 if (MAYBE_CLASS_TYPE_P (context
))
3668 tmpl
= lookup_field (context
, name
, 0, false);
3670 if (tmpl
&& TREE_CODE (tmpl
) == TYPE_DECL
)
3671 tmpl
= maybe_get_template_decl_from_type_decl (tmpl
);
3673 if (!tmpl
|| !DECL_TYPE_TEMPLATE_P (tmpl
))
3675 if (complain
& tf_error
)
3676 error ("no class template named %q#T in %q#T", name
, context
);
3677 return error_mark_node
;
3681 && !comp_template_parms (DECL_TEMPLATE_PARMS (tmpl
), parm_list
))
3683 if (complain
& tf_error
)
3685 error ("template parameters do not match template %qD", tmpl
);
3686 inform (DECL_SOURCE_LOCATION (tmpl
),
3687 "%qD declared here", tmpl
);
3689 return error_mark_node
;
3692 if (!perform_or_defer_access_check (TYPE_BINFO (context
), tmpl
, tmpl
,
3694 return error_mark_node
;
3699 /* Build the UNBOUND_CLASS_TEMPLATE. */
3700 t
= cxx_make_type (UNBOUND_CLASS_TEMPLATE
);
3701 TYPE_CONTEXT (t
) = FROB_CONTEXT (context
);
3702 TREE_TYPE (t
) = NULL_TREE
;
3703 SET_TYPE_STRUCTURAL_EQUALITY (t
);
3705 /* Build the corresponding TEMPLATE_DECL. */
3706 d
= build_decl (input_location
, TEMPLATE_DECL
, name
, t
);
3707 TYPE_NAME (TREE_TYPE (d
)) = d
;
3708 TYPE_STUB_DECL (TREE_TYPE (d
)) = d
;
3709 DECL_CONTEXT (d
) = FROB_CONTEXT (context
);
3710 DECL_ARTIFICIAL (d
) = 1;
3711 DECL_TEMPLATE_PARMS (d
) = parm_list
;
3718 /* Push the declarations of builtin types into the namespace.
3719 RID_INDEX is the index of the builtin type in the array
3720 RID_POINTERS. NAME is the name used when looking up the builtin
3721 type. TYPE is the _TYPE node for the builtin type. */
3724 record_builtin_type (enum rid rid_index
,
3728 tree rname
= NULL_TREE
, tname
= NULL_TREE
;
3729 tree tdecl
= NULL_TREE
;
3731 if ((int) rid_index
< (int) RID_MAX
)
3732 rname
= ridpointers
[(int) rid_index
];
3734 tname
= get_identifier (name
);
3736 /* The calls to SET_IDENTIFIER_GLOBAL_VALUE below should be
3737 eliminated. Built-in types should not be looked up name; their
3738 names are keywords that the parser can recognize. However, there
3739 is code in c-common.c that uses identifier_global_value to look
3740 up built-in types by name. */
3743 tdecl
= build_decl (BUILTINS_LOCATION
, TYPE_DECL
, tname
, type
);
3744 DECL_ARTIFICIAL (tdecl
) = 1;
3745 SET_IDENTIFIER_GLOBAL_VALUE (tname
, tdecl
);
3751 tdecl
= build_decl (BUILTINS_LOCATION
, TYPE_DECL
, rname
, type
);
3752 DECL_ARTIFICIAL (tdecl
) = 1;
3754 SET_IDENTIFIER_GLOBAL_VALUE (rname
, tdecl
);
3757 if (!TYPE_NAME (type
))
3758 TYPE_NAME (type
) = tdecl
;
3761 debug_hooks
->type_decl (tdecl
, 0);
3764 /* Record one of the standard Java types.
3765 * Declare it as having the given NAME.
3766 * If SIZE > 0, it is the size of one of the integral types;
3767 * otherwise it is the negative of the size of one of the other types. */
3770 record_builtin_java_type (const char* name
, int size
)
3775 type
= build_nonstandard_integer_type (size
, 0);
3776 type
= build_distinct_type_copy (type
);
3778 else if (size
> -32)
3781 /* "__java_char" or ""__java_boolean". */
3782 type
= build_nonstandard_integer_type (-size
, 1);
3783 type
= build_distinct_type_copy (type
);
3784 /* Get the signed type cached and attached to the unsigned type,
3785 so it doesn't get garbage-collected at "random" times,
3786 causing potential codegen differences out of different UIDs
3787 and different alias set numbers. */
3788 stype
= build_nonstandard_integer_type (-size
, 0);
3789 stype
= build_distinct_type_copy (stype
);
3790 TREE_CHAIN (type
) = stype
;
3791 /*if (size == -1) TREE_SET_CODE (type, BOOLEAN_TYPE);*/
3794 { /* "__java_float" or ""__java_double". */
3795 type
= make_node (REAL_TYPE
);
3796 TYPE_PRECISION (type
) = - size
;
3799 record_builtin_type (RID_MAX
, name
, type
);
3800 decl
= TYPE_NAME (type
);
3802 /* Suppress generate debug symbol entries for these types,
3803 since for normal C++ they are just clutter.
3804 However, push_lang_context undoes this if extern "Java" is seen. */
3805 DECL_IGNORED_P (decl
) = 1;
3807 TYPE_FOR_JAVA (type
) = 1;
3811 /* Push a type into the namespace so that the back ends ignore it. */
3814 record_unknown_type (tree type
, const char* name
)
3816 tree decl
= pushdecl (build_decl (UNKNOWN_LOCATION
,
3817 TYPE_DECL
, get_identifier (name
), type
));
3818 /* Make sure the "unknown type" typedecl gets ignored for debug info. */
3819 DECL_IGNORED_P (decl
) = 1;
3820 TYPE_DECL_SUPPRESS_DEBUG (decl
) = 1;
3821 TYPE_SIZE (type
) = TYPE_SIZE (void_type_node
);
3822 TYPE_ALIGN (type
) = 1;
3823 TYPE_USER_ALIGN (type
) = 0;
3824 SET_TYPE_MODE (type
, TYPE_MODE (void_type_node
));
3827 /* A string for which we should create an IDENTIFIER_NODE at
3830 struct predefined_identifier
3832 /* The name of the identifier. */
3833 const char *const name
;
3834 /* The place where the IDENTIFIER_NODE should be stored. */
3836 /* Nonzero if this is the name of a constructor or destructor. */
3837 const int ctor_or_dtor_p
;
3840 /* Create all the predefined identifiers. */
3843 initialize_predefined_identifiers (void)
3845 const predefined_identifier
*pid
;
3847 /* A table of identifiers to create at startup. */
3848 static const predefined_identifier predefined_identifiers
[] = {
3849 { "C++", &lang_name_cplusplus
, 0 },
3850 { "C", &lang_name_c
, 0 },
3851 { "Java", &lang_name_java
, 0 },
3852 /* Some of these names have a trailing space so that it is
3853 impossible for them to conflict with names written by users. */
3854 { "__ct ", &ctor_identifier
, 1 },
3855 { "__base_ctor ", &base_ctor_identifier
, 1 },
3856 { "__comp_ctor ", &complete_ctor_identifier
, 1 },
3857 { "__dt ", &dtor_identifier
, 1 },
3858 { "__comp_dtor ", &complete_dtor_identifier
, 1 },
3859 { "__base_dtor ", &base_dtor_identifier
, 1 },
3860 { "__deleting_dtor ", &deleting_dtor_identifier
, 1 },
3861 { IN_CHARGE_NAME
, &in_charge_identifier
, 0 },
3862 { "nelts", &nelts_identifier
, 0 },
3863 { THIS_NAME
, &this_identifier
, 0 },
3864 { VTABLE_DELTA_NAME
, &delta_identifier
, 0 },
3865 { VTABLE_PFN_NAME
, &pfn_identifier
, 0 },
3866 { "_vptr", &vptr_identifier
, 0 },
3867 { "__vtt_parm", &vtt_parm_identifier
, 0 },
3868 { "::", &global_scope_name
, 0 },
3869 { "std", &std_identifier
, 0 },
3873 for (pid
= predefined_identifiers
; pid
->name
; ++pid
)
3875 *pid
->node
= get_identifier (pid
->name
);
3876 if (pid
->ctor_or_dtor_p
)
3877 IDENTIFIER_CTOR_OR_DTOR_P (*pid
->node
) = 1;
3881 /* Create the predefined scalar types of C,
3882 and some nodes representing standard constants (0, 1, (void *)0).
3883 Initialize the global binding level.
3884 Make definitions for built-in primitive functions. */
3887 cxx_init_decl_processing (void)
3890 tree void_ftype_ptr
;
3892 /* Create all the identifiers we need. */
3893 initialize_predefined_identifiers ();
3895 /* Create the global variables. */
3896 push_to_top_level ();
3898 current_function_decl
= NULL_TREE
;
3899 current_binding_level
= NULL
;
3900 /* Enter the global namespace. */
3901 gcc_assert (global_namespace
== NULL_TREE
);
3902 global_namespace
= build_lang_decl (NAMESPACE_DECL
, global_scope_name
,
3904 DECL_CONTEXT (global_namespace
) = build_translation_unit_decl (NULL_TREE
);
3905 debug_hooks
->register_main_translation_unit
3906 (DECL_CONTEXT (global_namespace
));
3907 TREE_PUBLIC (global_namespace
) = 1;
3908 begin_scope (sk_namespace
, global_namespace
);
3910 if (flag_visibility_ms_compat
)
3911 default_visibility
= VISIBILITY_HIDDEN
;
3914 current_lang_name
= lang_name_c
;
3916 /* Create the `std' namespace. */
3917 push_namespace (std_identifier
);
3918 std_node
= current_namespace
;
3921 c_common_nodes_and_builtins ();
3923 java_byte_type_node
= record_builtin_java_type ("__java_byte", 8);
3924 java_short_type_node
= record_builtin_java_type ("__java_short", 16);
3925 java_int_type_node
= record_builtin_java_type ("__java_int", 32);
3926 java_long_type_node
= record_builtin_java_type ("__java_long", 64);
3927 java_float_type_node
= record_builtin_java_type ("__java_float", -32);
3928 java_double_type_node
= record_builtin_java_type ("__java_double", -64);
3929 java_char_type_node
= record_builtin_java_type ("__java_char", -16);
3930 java_boolean_type_node
= record_builtin_java_type ("__java_boolean", -1);
3932 integer_two_node
= build_int_cst (NULL_TREE
, 2);
3934 record_builtin_type (RID_BOOL
, "bool", boolean_type_node
);
3935 truthvalue_type_node
= boolean_type_node
;
3936 truthvalue_false_node
= boolean_false_node
;
3937 truthvalue_true_node
= boolean_true_node
;
3939 empty_except_spec
= build_tree_list (NULL_TREE
, NULL_TREE
);
3940 noexcept_true_spec
= build_tree_list (boolean_true_node
, NULL_TREE
);
3941 noexcept_false_spec
= build_tree_list (boolean_false_node
, NULL_TREE
);
3944 record_builtin_type (RID_MAX
, NULL
, string_type_node
);
3947 delta_type_node
= ptrdiff_type_node
;
3948 vtable_index_type
= ptrdiff_type_node
;
3950 vtt_parm_type
= build_pointer_type (const_ptr_type_node
);
3951 void_ftype
= build_function_type_list (void_type_node
, NULL_TREE
);
3952 void_ftype_ptr
= build_function_type_list (void_type_node
,
3953 ptr_type_node
, NULL_TREE
);
3955 = build_exception_variant (void_ftype_ptr
, empty_except_spec
);
3957 /* C++ extensions */
3959 unknown_type_node
= make_node (LANG_TYPE
);
3960 record_unknown_type (unknown_type_node
, "unknown type");
3962 /* Indirecting an UNKNOWN_TYPE node yields an UNKNOWN_TYPE node. */
3963 TREE_TYPE (unknown_type_node
) = unknown_type_node
;
3965 /* Looking up TYPE_POINTER_TO and TYPE_REFERENCE_TO yield the same
3967 TYPE_POINTER_TO (unknown_type_node
) = unknown_type_node
;
3968 TYPE_REFERENCE_TO (unknown_type_node
) = unknown_type_node
;
3970 init_list_type_node
= make_node (LANG_TYPE
);
3971 record_unknown_type (init_list_type_node
, "init list");
3974 /* Make sure we get a unique function type, so we can give
3975 its pointer type a name. (This wins for gdb.) */
3976 tree vfunc_type
= make_node (FUNCTION_TYPE
);
3977 TREE_TYPE (vfunc_type
) = integer_type_node
;
3978 TYPE_ARG_TYPES (vfunc_type
) = NULL_TREE
;
3979 layout_type (vfunc_type
);
3981 vtable_entry_type
= build_pointer_type (vfunc_type
);
3983 record_builtin_type (RID_MAX
, VTBL_PTR_TYPE
, vtable_entry_type
);
3986 = build_cplus_array_type (vtable_entry_type
, NULL_TREE
);
3987 layout_type (vtbl_type_node
);
3988 vtbl_type_node
= cp_build_qualified_type (vtbl_type_node
, TYPE_QUAL_CONST
);
3989 record_builtin_type (RID_MAX
, NULL
, vtbl_type_node
);
3990 vtbl_ptr_type_node
= build_pointer_type (vtable_entry_type
);
3991 layout_type (vtbl_ptr_type_node
);
3992 record_builtin_type (RID_MAX
, NULL
, vtbl_ptr_type_node
);
3994 push_namespace (get_identifier ("__cxxabiv1"));
3995 abi_node
= current_namespace
;
3998 global_type_node
= make_node (LANG_TYPE
);
3999 record_unknown_type (global_type_node
, "global type");
4002 current_lang_name
= lang_name_cplusplus
;
4005 tree newattrs
, extvisattr
;
4006 tree newtype
, deltype
;
4007 tree ptr_ftype_sizetype
;
4011 = build_function_type_list (ptr_type_node
, size_type_node
, NULL_TREE
);
4012 if (cxx_dialect
== cxx98
)
4015 tree bad_alloc_type_node
;
4016 tree bad_alloc_decl
;
4018 push_namespace (std_identifier
);
4019 bad_alloc_id
= get_identifier ("bad_alloc");
4020 bad_alloc_type_node
= make_class_type (RECORD_TYPE
);
4021 TYPE_CONTEXT (bad_alloc_type_node
) = current_namespace
;
4023 = create_implicit_typedef (bad_alloc_id
, bad_alloc_type_node
);
4024 DECL_CONTEXT (bad_alloc_decl
) = current_namespace
;
4028 = add_exception_specifier (NULL_TREE
, bad_alloc_type_node
, -1);
4031 new_eh_spec
= noexcept_false_spec
;
4033 /* Ensure attribs.c is initialized. */
4036 /* Ensure constraint.cc is initialized. */
4037 init_constraint_processing ();
4039 extvisattr
= build_tree_list (get_identifier ("externally_visible"),
4041 newattrs
= tree_cons (get_identifier ("alloc_size"),
4042 build_tree_list (NULL_TREE
, integer_one_node
),
4044 newtype
= cp_build_type_attribute_variant (ptr_ftype_sizetype
, newattrs
);
4045 newtype
= build_exception_variant (newtype
, new_eh_spec
);
4046 deltype
= cp_build_type_attribute_variant (void_ftype_ptr
, extvisattr
);
4047 deltype
= build_exception_variant (deltype
, empty_except_spec
);
4048 tree opnew
= push_cp_library_fn (NEW_EXPR
, newtype
, 0);
4049 DECL_IS_MALLOC (opnew
) = 1;
4050 DECL_IS_OPERATOR_NEW (opnew
) = 1;
4051 opnew
= push_cp_library_fn (VEC_NEW_EXPR
, newtype
, 0);
4052 DECL_IS_MALLOC (opnew
) = 1;
4053 DECL_IS_OPERATOR_NEW (opnew
) = 1;
4054 push_cp_library_fn (DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4055 push_cp_library_fn (VEC_DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4056 if (flag_sized_deallocation
)
4058 /* Also push the sized deallocation variants:
4059 void operator delete(void*, std::size_t) throw();
4060 void operator delete[](void*, std::size_t) throw(); */
4061 tree void_ftype_ptr_size
4062 = build_function_type_list (void_type_node
, ptr_type_node
,
4063 size_type_node
, NULL_TREE
);
4064 deltype
= cp_build_type_attribute_variant (void_ftype_ptr_size
,
4066 deltype
= build_exception_variant (deltype
, empty_except_spec
);
4067 push_cp_library_fn (DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4068 push_cp_library_fn (VEC_DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4071 nullptr_type_node
= make_node (NULLPTR_TYPE
);
4072 TYPE_SIZE (nullptr_type_node
) = bitsize_int (GET_MODE_BITSIZE (ptr_mode
));
4073 TYPE_SIZE_UNIT (nullptr_type_node
) = size_int (GET_MODE_SIZE (ptr_mode
));
4074 TYPE_UNSIGNED (nullptr_type_node
) = 1;
4075 TYPE_PRECISION (nullptr_type_node
) = GET_MODE_BITSIZE (ptr_mode
);
4076 if (abi_version_at_least (9))
4077 TYPE_ALIGN (nullptr_type_node
) = GET_MODE_ALIGNMENT (ptr_mode
);
4078 SET_TYPE_MODE (nullptr_type_node
, ptr_mode
);
4079 record_builtin_type (RID_MAX
, "decltype(nullptr)", nullptr_type_node
);
4080 nullptr_node
= build_int_cst (nullptr_type_node
, 0);
4084 = build_library_fn_ptr ("__cxa_pure_virtual", void_ftype
,
4085 ECF_NORETURN
| ECF_NOTHROW
);
4087 /* Perform other language dependent initializations. */
4088 init_class_processing ();
4089 init_rtti_processing ();
4090 init_template_processing ();
4092 if (flag_exceptions
)
4093 init_exception_processing ();
4095 if (! supports_one_only ())
4098 make_fname_decl
= cp_make_fname_decl
;
4099 start_fname_decls ();
4101 /* Show we use EH for cleanups. */
4102 if (flag_exceptions
)
4103 using_eh_for_cleanups ();
4106 /* Generate an initializer for a function naming variable from
4107 NAME. NAME may be NULL, to indicate a dependent name. TYPE_P is
4108 filled in with the type of the init. */
4111 cp_fname_init (const char* name
, tree
*type_p
)
4113 tree domain
= NULL_TREE
;
4115 tree init
= NULL_TREE
;
4120 length
= strlen (name
);
4121 domain
= build_index_type (size_int (length
));
4122 init
= build_string (length
+ 1, name
);
4125 type
= cp_build_qualified_type (char_type_node
, TYPE_QUAL_CONST
);
4126 type
= build_cplus_array_type (type
, domain
);
4131 TREE_TYPE (init
) = type
;
4133 init
= error_mark_node
;
4138 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give
4139 the decl, LOC is the location to give the decl, NAME is the
4140 initialization string and TYPE_DEP indicates whether NAME depended
4141 on the type of the function. We make use of that to detect
4142 __PRETTY_FUNCTION__ inside a template fn. This is being done lazily
4143 at the point of first use, so we mustn't push the decl now. */
4146 cp_make_fname_decl (location_t loc
, tree id
, int type_dep
)
4148 const char *const name
= (type_dep
&& processing_template_decl
4149 ? NULL
: fname_as_string (type_dep
));
4151 tree init
= cp_fname_init (name
, &type
);
4152 tree decl
= build_decl (loc
, VAR_DECL
, id
, type
);
4155 free (CONST_CAST (char *, name
));
4157 /* As we're using pushdecl_with_scope, we must set the context. */
4158 DECL_CONTEXT (decl
) = current_function_decl
;
4160 TREE_STATIC (decl
) = 1;
4161 TREE_READONLY (decl
) = 1;
4162 DECL_ARTIFICIAL (decl
) = 1;
4164 TREE_USED (decl
) = 1;
4166 if (current_function_decl
)
4168 cp_binding_level
*b
= current_binding_level
;
4169 if (b
->kind
== sk_function_parms
)
4170 return error_mark_node
;
4171 while (b
->level_chain
->kind
!= sk_function_parms
)
4173 pushdecl_with_scope (decl
, b
, /*is_friend=*/false);
4174 cp_finish_decl (decl
, init
, /*init_const_expr_p=*/false, NULL_TREE
,
4175 LOOKUP_ONLYCONVERTING
);
4179 DECL_THIS_STATIC (decl
) = true;
4180 pushdecl_top_level_and_finish (decl
, init
);
4187 builtin_function_1 (tree decl
, tree context
, bool is_global
)
4189 tree id
= DECL_NAME (decl
);
4190 const char *name
= IDENTIFIER_POINTER (id
);
4192 retrofit_lang_decl (decl
);
4194 DECL_ARTIFICIAL (decl
) = 1;
4195 SET_OVERLOADED_OPERATOR_CODE (decl
, ERROR_MARK
);
4196 SET_DECL_LANGUAGE (decl
, lang_c
);
4197 /* Runtime library routines are, by definition, available in an
4198 external shared object. */
4199 DECL_VISIBILITY (decl
) = VISIBILITY_DEFAULT
;
4200 DECL_VISIBILITY_SPECIFIED (decl
) = 1;
4202 DECL_CONTEXT (decl
) = context
;
4205 pushdecl_top_level (decl
);
4209 /* A function in the user's namespace should have an explicit
4210 declaration before it is used. Mark the built-in function as
4211 anticipated but not actually declared. */
4212 if (name
[0] != '_' || name
[1] != '_')
4213 DECL_ANTICIPATED (decl
) = 1;
4214 else if (strncmp (name
+ 2, "builtin_", strlen ("builtin_")) != 0)
4216 size_t len
= strlen (name
);
4218 /* Treat __*_chk fortification functions as anticipated as well,
4219 unless they are __builtin_*. */
4220 if (len
> strlen ("___chk")
4221 && memcmp (name
+ len
- strlen ("_chk"),
4222 "_chk", strlen ("_chk") + 1) == 0)
4223 DECL_ANTICIPATED (decl
) = 1;
4230 cxx_builtin_function (tree decl
)
4232 tree id
= DECL_NAME (decl
);
4233 const char *name
= IDENTIFIER_POINTER (id
);
4234 /* All builtins that don't begin with an '_' should additionally
4235 go in the 'std' namespace. */
4238 tree decl2
= copy_node(decl
);
4239 push_namespace (std_identifier
);
4240 builtin_function_1 (decl2
, std_node
, false);
4244 return builtin_function_1 (decl
, NULL_TREE
, false);
4247 /* Like cxx_builtin_function, but guarantee the function is added to the global
4248 scope. This is to allow function specific options to add new machine
4249 dependent builtins when the target ISA changes via attribute((target(...)))
4250 which saves space on program startup if the program does not use non-generic
4254 cxx_builtin_function_ext_scope (tree decl
)
4257 tree id
= DECL_NAME (decl
);
4258 const char *name
= IDENTIFIER_POINTER (id
);
4259 /* All builtins that don't begin with an '_' should additionally
4260 go in the 'std' namespace. */
4263 tree decl2
= copy_node(decl
);
4264 push_namespace (std_identifier
);
4265 builtin_function_1 (decl2
, std_node
, true);
4269 return builtin_function_1 (decl
, NULL_TREE
, true);
4272 /* Generate a FUNCTION_DECL with the typical flags for a runtime library
4273 function. Not called directly. */
4276 build_library_fn (tree name
, enum tree_code operator_code
, tree type
,
4279 tree fn
= build_lang_decl (FUNCTION_DECL
, name
, type
);
4280 DECL_EXTERNAL (fn
) = 1;
4281 TREE_PUBLIC (fn
) = 1;
4282 DECL_ARTIFICIAL (fn
) = 1;
4283 SET_OVERLOADED_OPERATOR_CODE (fn
, operator_code
);
4284 SET_DECL_LANGUAGE (fn
, lang_c
);
4285 /* Runtime library routines are, by definition, available in an
4286 external shared object. */
4287 DECL_VISIBILITY (fn
) = VISIBILITY_DEFAULT
;
4288 DECL_VISIBILITY_SPECIFIED (fn
) = 1;
4289 set_call_expr_flags (fn
, ecf_flags
);
4293 /* Returns the _DECL for a library function with C++ linkage. */
4296 build_cp_library_fn (tree name
, enum tree_code operator_code
, tree type
,
4299 tree fn
= build_library_fn (name
, operator_code
, type
, ecf_flags
);
4300 DECL_CONTEXT (fn
) = FROB_CONTEXT (current_namespace
);
4301 SET_DECL_LANGUAGE (fn
, lang_cplusplus
);
4305 /* Like build_library_fn, but takes a C string instead of an
4309 build_library_fn_ptr (const char* name
, tree type
, int ecf_flags
)
4311 return build_library_fn (get_identifier (name
), ERROR_MARK
, type
, ecf_flags
);
4314 /* Like build_cp_library_fn, but takes a C string instead of an
4318 build_cp_library_fn_ptr (const char* name
, tree type
, int ecf_flags
)
4320 return build_cp_library_fn (get_identifier (name
), ERROR_MARK
, type
,
4324 /* Like build_library_fn, but also pushes the function so that we will
4325 be able to find it via IDENTIFIER_GLOBAL_VALUE. Also, the function
4326 may throw exceptions listed in RAISES. */
4329 push_library_fn (tree name
, tree type
, tree raises
, int ecf_flags
)
4334 type
= build_exception_variant (type
, raises
);
4336 fn
= build_library_fn (name
, ERROR_MARK
, type
, ecf_flags
);
4337 pushdecl_top_level (fn
);
4341 /* Like build_cp_library_fn, but also pushes the function so that it
4342 will be found by normal lookup. */
4345 push_cp_library_fn (enum tree_code operator_code
, tree type
,
4348 tree fn
= build_cp_library_fn (ansi_opname (operator_code
),
4353 apply_tm_attr (fn
, get_identifier ("transaction_safe"));
4357 /* Like push_library_fn, but takes a TREE_LIST of parm types rather than
4361 push_void_library_fn (tree name
, tree parmtypes
, int ecf_flags
)
4363 tree type
= build_function_type (void_type_node
, parmtypes
);
4364 return push_library_fn (name
, type
, NULL_TREE
, ecf_flags
);
4367 /* Like push_library_fn, but also note that this function throws
4368 and does not return. Used for __throw_foo and the like. */
4371 push_throw_library_fn (tree name
, tree type
)
4373 tree fn
= push_library_fn (name
, type
, NULL_TREE
, ECF_NORETURN
);
4377 /* When we call finish_struct for an anonymous union, we create
4378 default copy constructors and such. But, an anonymous union
4379 shouldn't have such things; this function undoes the damage to the
4380 anonymous union type T.
4382 (The reason that we create the synthesized methods is that we don't
4383 distinguish `union { int i; }' from `typedef union { int i; } U'.
4384 The first is an anonymous union; the second is just an ordinary
4388 fixup_anonymous_aggr (tree t
)
4392 /* Wipe out memory of synthesized methods. */
4393 TYPE_HAS_USER_CONSTRUCTOR (t
) = 0;
4394 TYPE_HAS_DEFAULT_CONSTRUCTOR (t
) = 0;
4395 TYPE_HAS_COPY_CTOR (t
) = 0;
4396 TYPE_HAS_CONST_COPY_CTOR (t
) = 0;
4397 TYPE_HAS_COPY_ASSIGN (t
) = 0;
4398 TYPE_HAS_CONST_COPY_ASSIGN (t
) = 0;
4400 /* Splice the implicitly generated functions out of the TYPE_METHODS
4402 q
= &TYPE_METHODS (t
);
4405 if (DECL_ARTIFICIAL (*q
))
4406 *q
= TREE_CHAIN (*q
);
4408 q
= &DECL_CHAIN (*q
);
4411 /* ISO C++ 9.5.3. Anonymous unions may not have function members. */
4412 if (TYPE_METHODS (t
))
4414 tree decl
= TYPE_MAIN_DECL (t
);
4416 if (TREE_CODE (t
) != UNION_TYPE
)
4417 error_at (DECL_SOURCE_LOCATION (decl
),
4418 "an anonymous struct cannot have function members");
4420 error_at (DECL_SOURCE_LOCATION (decl
),
4421 "an anonymous union cannot have function members");
4424 /* Anonymous aggregates cannot have fields with ctors, dtors or complex
4425 assignment operators (because they cannot have these methods themselves).
4426 For anonymous unions this is already checked because they are not allowed
4427 in any union, otherwise we have to check it. */
4428 if (TREE_CODE (t
) != UNION_TYPE
)
4432 for (field
= TYPE_FIELDS (t
); field
; field
= DECL_CHAIN (field
))
4433 if (TREE_CODE (field
) == FIELD_DECL
)
4435 type
= TREE_TYPE (field
);
4436 if (CLASS_TYPE_P (type
))
4438 if (TYPE_NEEDS_CONSTRUCTING (type
))
4439 error ("member %q+#D with constructor not allowed "
4440 "in anonymous aggregate", field
);
4441 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type
))
4442 error ("member %q+#D with destructor not allowed "
4443 "in anonymous aggregate", field
);
4444 if (TYPE_HAS_COMPLEX_COPY_ASSIGN (type
))
4445 error ("member %q+#D with copy assignment operator "
4446 "not allowed in anonymous aggregate", field
);
4452 /* Warn for an attribute located at LOCATION that appertains to the
4453 class type CLASS_TYPE that has not been properly placed after its
4454 class-key, in it class-specifier. */
4457 warn_misplaced_attr_for_class_type (source_location location
,
4460 gcc_assert (OVERLOAD_TYPE_P (class_type
));
4462 if (warning_at (location
, OPT_Wattributes
,
4463 "attribute ignored in declaration "
4464 "of %q#T", class_type
))
4466 "attribute for %q#T must follow the %qs keyword",
4467 class_type
, class_key_or_enum_as_string (class_type
));
4470 /* Make sure that a declaration with no declarator is well-formed, i.e.
4471 just declares a tagged type or anonymous union.
4473 Returns the type declared; or NULL_TREE if none. */
4476 check_tag_decl (cp_decl_specifier_seq
*declspecs
,
4477 bool explicit_type_instantiation_p
)
4479 int saw_friend
= decl_spec_seq_has_spec_p (declspecs
, ds_friend
);
4480 int saw_typedef
= decl_spec_seq_has_spec_p (declspecs
, ds_typedef
);
4481 /* If a class, struct, or enum type is declared by the DECLSPECS
4482 (i.e, if a class-specifier, enum-specifier, or non-typename
4483 elaborated-type-specifier appears in the DECLSPECS),
4484 DECLARED_TYPE is set to the corresponding type. */
4485 tree declared_type
= NULL_TREE
;
4486 bool error_p
= false;
4488 if (declspecs
->multiple_types_p
)
4489 error ("multiple types in one declaration");
4490 else if (declspecs
->redefined_builtin_type
)
4492 if (!in_system_header_at (input_location
))
4493 permerror (declspecs
->locations
[ds_redefined_builtin_type_spec
],
4494 "redeclaration of C++ built-in type %qT",
4495 declspecs
->redefined_builtin_type
);
4500 && TYPE_P (declspecs
->type
)
4501 && ((TREE_CODE (declspecs
->type
) != TYPENAME_TYPE
4502 && MAYBE_CLASS_TYPE_P (declspecs
->type
))
4503 || TREE_CODE (declspecs
->type
) == ENUMERAL_TYPE
))
4504 declared_type
= declspecs
->type
;
4505 else if (declspecs
->type
== error_mark_node
)
4507 if (declared_type
== NULL_TREE
&& ! saw_friend
&& !error_p
)
4508 permerror (input_location
, "declaration does not declare anything");
4509 else if (declared_type
!= NULL_TREE
&& type_uses_auto (declared_type
))
4511 error ("%<auto%> can only be specified for variables "
4512 "or function declarations");
4513 return error_mark_node
;
4515 /* Check for an anonymous union. */
4516 else if (declared_type
&& RECORD_OR_UNION_CODE_P (TREE_CODE (declared_type
))
4517 && TYPE_ANONYMOUS_P (declared_type
))
4519 /* 7/3 In a simple-declaration, the optional init-declarator-list
4520 can be omitted only when declaring a class (clause 9) or
4521 enumeration (7.2), that is, when the decl-specifier-seq contains
4522 either a class-specifier, an elaborated-type-specifier with
4523 a class-key (9.1), or an enum-specifier. In these cases and
4524 whenever a class-specifier or enum-specifier is present in the
4525 decl-specifier-seq, the identifiers in these specifiers are among
4526 the names being declared by the declaration (as class-name,
4527 enum-names, or enumerators, depending on the syntax). In such
4528 cases, and except for the declaration of an unnamed bit-field (9.6),
4529 the decl-specifier-seq shall introduce one or more names into the
4530 program, or shall redeclare a name introduced by a previous
4531 declaration. [Example:
4532 enum { }; // ill-formed
4533 typedef class { }; // ill-formed
4537 error ("missing type-name in typedef-declaration");
4540 /* Anonymous unions are objects, so they can have specifiers. */;
4541 SET_ANON_AGGR_TYPE_P (declared_type
);
4543 if (TREE_CODE (declared_type
) != UNION_TYPE
4544 && !in_system_header_at (input_location
))
4545 pedwarn (input_location
, OPT_Wpedantic
, "ISO C++ prohibits anonymous structs");
4550 if (decl_spec_seq_has_spec_p (declspecs
, ds_inline
))
4551 error_at (declspecs
->locations
[ds_inline
],
4552 "%<inline%> can only be specified for functions");
4553 else if (decl_spec_seq_has_spec_p (declspecs
, ds_virtual
))
4554 error_at (declspecs
->locations
[ds_virtual
],
4555 "%<virtual%> can only be specified for functions");
4557 && (!current_class_type
4558 || current_scope () != current_class_type
))
4559 error_at (declspecs
->locations
[ds_friend
],
4560 "%<friend%> can only be specified inside a class");
4561 else if (decl_spec_seq_has_spec_p (declspecs
, ds_explicit
))
4562 error_at (declspecs
->locations
[ds_explicit
],
4563 "%<explicit%> can only be specified for constructors");
4564 else if (declspecs
->storage_class
)
4565 error_at (declspecs
->locations
[ds_storage_class
],
4566 "a storage class can only be specified for objects "
4568 else if (decl_spec_seq_has_spec_p (declspecs
, ds_const
))
4569 error_at (declspecs
->locations
[ds_const
],
4570 "%<const%> can only be specified for objects and "
4572 else if (decl_spec_seq_has_spec_p (declspecs
, ds_volatile
))
4573 error_at (declspecs
->locations
[ds_volatile
],
4574 "%<volatile%> can only be specified for objects and "
4576 else if (decl_spec_seq_has_spec_p (declspecs
, ds_restrict
))
4577 error_at (declspecs
->locations
[ds_restrict
],
4578 "%<__restrict%> can only be specified for objects and "
4580 else if (decl_spec_seq_has_spec_p (declspecs
, ds_thread
))
4581 error_at (declspecs
->locations
[ds_thread
],
4582 "%<__thread%> can only be specified for objects "
4584 else if (saw_typedef
)
4585 warning_at (declspecs
->locations
[ds_typedef
], 0,
4586 "%<typedef%> was ignored in this declaration");
4587 else if (decl_spec_seq_has_spec_p (declspecs
, ds_constexpr
))
4588 error_at (declspecs
->locations
[ds_constexpr
],
4589 "%<constexpr%> cannot be used for type declarations");
4592 if (declspecs
->attributes
&& warn_attributes
&& declared_type
)
4595 if (!CLASS_TYPE_P (declared_type
)
4596 || !CLASSTYPE_TEMPLATE_INSTANTIATION (declared_type
))
4597 /* For a non-template class, use the name location. */
4598 loc
= location_of (declared_type
);
4600 /* For a template class (an explicit instantiation), use the
4601 current location. */
4602 loc
= input_location
;
4604 if (explicit_type_instantiation_p
)
4605 /* [dcl.attr.grammar]/4:
4607 No attribute-specifier-seq shall appertain to an explicit
4610 if (warning_at (loc
, OPT_Wattributes
,
4611 "attribute ignored in explicit instantiation %q#T",
4614 "no attribute can be applied to "
4615 "an explicit instantiation");
4618 warn_misplaced_attr_for_class_type (loc
, declared_type
);
4621 return declared_type
;
4624 /* Called when a declaration is seen that contains no names to declare.
4625 If its type is a reference to a structure, union or enum inherited
4626 from a containing scope, shadow that tag name for the current scope
4627 with a forward reference.
4628 If its type defines a new named structure or union
4629 or defines an enum, it is valid but we need not do anything here.
4630 Otherwise, it is an error.
4632 C++: may have to grok the declspecs to learn about static,
4633 complain for anonymous unions.
4635 Returns the TYPE declared -- or NULL_TREE if none. */
4638 shadow_tag (cp_decl_specifier_seq
*declspecs
)
4640 tree t
= check_tag_decl (declspecs
,
4641 /*explicit_type_instantiation_p=*/false);
4646 if (maybe_process_partial_specialization (t
) == error_mark_node
)
4649 /* This is where the variables in an anonymous union are
4650 declared. An anonymous union declaration looks like:
4652 because there is no declarator after the union, the parser
4653 sends that declaration here. */
4654 if (ANON_AGGR_TYPE_P (t
))
4656 fixup_anonymous_aggr (t
);
4658 if (TYPE_FIELDS (t
))
4660 tree decl
= grokdeclarator (/*declarator=*/NULL
,
4661 declspecs
, NORMAL
, 0, NULL
);
4662 finish_anon_union (decl
);
4669 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
4672 groktypename (cp_decl_specifier_seq
*type_specifiers
,
4673 const cp_declarator
*declarator
,
4674 bool is_template_arg
)
4678 enum decl_context context
4679 = is_template_arg
? TEMPLATE_TYPE_ARG
: TYPENAME
;
4680 attrs
= type_specifiers
->attributes
;
4681 type_specifiers
->attributes
= NULL_TREE
;
4682 type
= grokdeclarator (declarator
, type_specifiers
, context
, 0, &attrs
);
4683 if (attrs
&& type
!= error_mark_node
)
4685 if (CLASS_TYPE_P (type
))
4686 warning (OPT_Wattributes
, "ignoring attributes applied to class type %qT "
4687 "outside of definition", type
);
4688 else if (MAYBE_CLASS_TYPE_P (type
))
4689 /* A template type parameter or other dependent type. */
4690 warning (OPT_Wattributes
, "ignoring attributes applied to dependent "
4691 "type %qT without an associated declaration", type
);
4693 cplus_decl_attributes (&type
, attrs
, 0);
4698 /* Process a DECLARATOR for a function-scope variable declaration,
4699 namespace-scope variable declaration, or function declaration.
4700 (Function definitions go through start_function; class member
4701 declarations appearing in the body of the class go through
4702 grokfield.) The DECL corresponding to the DECLARATOR is returned.
4703 If an error occurs, the error_mark_node is returned instead.
4705 DECLSPECS are the decl-specifiers for the declaration. INITIALIZED is
4706 SD_INITIALIZED if an explicit initializer is present, or SD_DEFAULTED
4707 for an explicitly defaulted function, or SD_DELETED for an explicitly
4708 deleted function, but 0 (SD_UNINITIALIZED) if this is a variable
4709 implicitly initialized via a default constructor. ATTRIBUTES and
4710 PREFIX_ATTRIBUTES are GNU attributes associated with this declaration.
4712 The scope represented by the context of the returned DECL is pushed
4713 (if it is not the global namespace) and is assigned to
4714 *PUSHED_SCOPE_P. The caller is then responsible for calling
4715 pop_scope on *PUSHED_SCOPE_P if it is set. */
4718 start_decl (const cp_declarator
*declarator
,
4719 cp_decl_specifier_seq
*declspecs
,
4722 tree prefix_attributes
,
4723 tree
*pushed_scope_p
)
4731 *pushed_scope_p
= NULL_TREE
;
4733 /* An object declared as __attribute__((deprecated)) suppresses
4734 warnings of uses of other deprecated items. */
4735 if (lookup_attribute ("deprecated", attributes
))
4736 deprecated_state
= DEPRECATED_SUPPRESS
;
4738 attributes
= chainon (attributes
, prefix_attributes
);
4740 decl
= grokdeclarator (declarator
, declspecs
, NORMAL
, initialized
,
4743 deprecated_state
= DEPRECATED_NORMAL
;
4745 if (decl
== NULL_TREE
|| VOID_TYPE_P (decl
)
4746 || decl
== error_mark_node
)
4747 return error_mark_node
;
4749 context
= CP_DECL_CONTEXT (decl
);
4750 if (context
!= global_namespace
)
4751 *pushed_scope_p
= push_scope (context
);
4753 /* Is it valid for this decl to have an initializer at all?
4754 If not, set INITIALIZED to zero, which will indirectly
4755 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
4757 && TREE_CODE (decl
) == TYPE_DECL
)
4759 error ("typedef %qD is initialized (use decltype instead)", decl
);
4760 return error_mark_node
;
4765 if (! toplevel_bindings_p ()
4766 && DECL_EXTERNAL (decl
))
4767 warning (0, "declaration of %q#D has %<extern%> and is initialized",
4769 DECL_EXTERNAL (decl
) = 0;
4770 if (toplevel_bindings_p ())
4771 TREE_STATIC (decl
) = 1;
4773 alias
= lookup_attribute ("alias", DECL_ATTRIBUTES (decl
)) != 0;
4775 if (alias
&& TREE_CODE (decl
) == FUNCTION_DECL
)
4776 record_key_method_defined (decl
);
4778 /* If this is a typedef that names the class for linkage purposes
4779 (7.1.3p8), apply any attributes directly to the type. */
4780 if (TREE_CODE (decl
) == TYPE_DECL
4781 && OVERLOAD_TYPE_P (TREE_TYPE (decl
))
4782 && decl
== TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (decl
))))
4783 flags
= ATTR_FLAG_TYPE_IN_PLACE
;
4787 /* Set attributes here so if duplicate decl, will have proper attributes. */
4788 cplus_decl_attributes (&decl
, attributes
, flags
);
4790 /* Dllimported symbols cannot be defined. Static data members (which
4791 can be initialized in-class and dllimported) go through grokfield,
4792 not here, so we don't need to exclude those decls when checking for
4794 if (initialized
&& DECL_DLLIMPORT_P (decl
))
4796 error ("definition of %q#D is marked %<dllimport%>", decl
);
4797 DECL_DLLIMPORT_P (decl
) = 0;
4800 /* If #pragma weak was used, mark the decl weak now. */
4801 if (!processing_template_decl
)
4802 maybe_apply_pragma_weak (decl
);
4804 if (TREE_CODE (decl
) == FUNCTION_DECL
4805 && DECL_DECLARED_INLINE_P (decl
)
4806 && DECL_UNINLINABLE (decl
)
4807 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl
)))
4808 warning_at (DECL_SOURCE_LOCATION (decl
), 0,
4809 "inline function %qD given attribute noinline", decl
);
4811 if (TYPE_P (context
) && COMPLETE_TYPE_P (complete_type (context
)))
4813 bool this_tmpl
= (processing_template_decl
4814 > template_class_depth (context
));
4817 tree field
= lookup_field (context
, DECL_NAME (decl
), 0, false);
4818 if (field
== NULL_TREE
4819 || !(VAR_P (field
) || variable_template_p (field
)))
4820 error ("%q+#D is not a static data member of %q#T", decl
, context
);
4821 else if (variable_template_p (field
) && !this_tmpl
)
4823 if (DECL_LANG_SPECIFIC (decl
)
4824 && DECL_TEMPLATE_SPECIALIZATION (decl
))
4825 /* OK, specialization was already checked. */;
4828 error_at (DECL_SOURCE_LOCATION (decl
),
4829 "non-member-template declaration of %qD", decl
);
4830 inform (DECL_SOURCE_LOCATION (field
), "does not match "
4831 "member template declaration here");
4832 return error_mark_node
;
4837 if (variable_template_p (field
))
4838 field
= DECL_TEMPLATE_RESULT (field
);
4840 if (DECL_CONTEXT (field
) != context
)
4842 if (!same_type_p (DECL_CONTEXT (field
), context
))
4843 permerror (input_location
, "ISO C++ does not permit %<%T::%D%> "
4844 "to be defined as %<%T::%D%>",
4845 DECL_CONTEXT (field
), DECL_NAME (decl
),
4846 context
, DECL_NAME (decl
));
4847 DECL_CONTEXT (decl
) = DECL_CONTEXT (field
);
4849 /* Static data member are tricky; an in-class initialization
4850 still doesn't provide a definition, so the in-class
4851 declaration will have DECL_EXTERNAL set, but will have an
4852 initialization. Thus, duplicate_decls won't warn
4853 about this situation, and so we check here. */
4854 if (initialized
&& DECL_INITIALIZED_IN_CLASS_P (field
))
4855 error ("duplicate initialization of %qD", decl
);
4856 if (duplicate_decls (decl
, field
, /*newdecl_is_friend=*/false))
4858 if (decl_spec_seq_has_spec_p (declspecs
, ds_constexpr
)
4859 && !DECL_DECLARED_CONSTEXPR_P (field
))
4860 error ("%qD declared %<constexpr%> outside its class", field
);
4865 tree field
= check_classfn (context
, decl
,
4867 ? current_template_parms
4869 if (field
&& field
!= error_mark_node
4870 && duplicate_decls (decl
, field
,
4871 /*newdecl_is_friend=*/false))
4875 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
4876 DECL_IN_AGGR_P (decl
) = 0;
4877 /* Do not mark DECL as an explicit specialization if it was not
4878 already marked as an instantiation; a declaration should
4879 never be marked as a specialization unless we know what
4880 template is being specialized. */
4881 if (DECL_LANG_SPECIFIC (decl
) && DECL_USE_TEMPLATE (decl
))
4883 SET_DECL_TEMPLATE_SPECIALIZATION (decl
);
4884 if (TREE_CODE (decl
) == FUNCTION_DECL
)
4885 DECL_COMDAT (decl
) = (TREE_PUBLIC (decl
)
4886 && DECL_DECLARED_INLINE_P (decl
));
4888 DECL_COMDAT (decl
) = false;
4890 /* [temp.expl.spec] An explicit specialization of a static data
4891 member of a template is a definition if the declaration
4892 includes an initializer; otherwise, it is a declaration.
4894 We check for processing_specialization so this only applies
4895 to the new specialization syntax. */
4896 if (!initialized
&& processing_specialization
)
4897 DECL_EXTERNAL (decl
) = 1;
4900 if (DECL_EXTERNAL (decl
) && ! DECL_TEMPLATE_SPECIALIZATION (decl
)
4901 /* Aliases are definitions. */
4903 permerror (input_location
, "declaration of %q#D outside of class is not definition",
4907 was_public
= TREE_PUBLIC (decl
);
4909 /* Enter this declaration into the symbol table. Don't push the plain
4910 VAR_DECL for a variable template. */
4911 if (!template_parm_scope_p ()
4913 decl
= maybe_push_decl (decl
);
4915 if (processing_template_decl
)
4916 decl
= push_template_decl (decl
);
4917 if (decl
== error_mark_node
)
4918 return error_mark_node
;
4921 && DECL_NAMESPACE_SCOPE_P (decl
) && !TREE_PUBLIC (decl
) && !was_public
4922 && !DECL_THIS_STATIC (decl
) && !DECL_ARTIFICIAL (decl
))
4924 /* This is a const variable with implicit 'static'. Set
4925 DECL_THIS_STATIC so we can tell it from variables that are
4926 !TREE_PUBLIC because of the anonymous namespace. */
4927 gcc_assert (CP_TYPE_CONST_P (TREE_TYPE (decl
)) || errorcount
);
4928 DECL_THIS_STATIC (decl
) = 1;
4931 if (current_function_decl
&& VAR_P (decl
)
4932 && DECL_DECLARED_CONSTEXPR_P (current_function_decl
))
4935 if (CP_DECL_THREAD_LOCAL_P (decl
))
4936 error ("%qD declared %<thread_local%> in %<constexpr%> function",
4938 else if (TREE_STATIC (decl
))
4939 error ("%qD declared %<static%> in %<constexpr%> function", decl
);
4943 cp_function_chain
->invalid_constexpr
= true;
4946 if (!processing_template_decl
&& VAR_P (decl
))
4947 start_decl_1 (decl
, initialized
);
4952 /* Process the declaration of a variable DECL. INITIALIZED is true
4953 iff DECL is explicitly initialized. (INITIALIZED is false if the
4954 variable is initialized via an implicitly-called constructor.)
4955 This function must be called for ordinary variables (including, for
4956 example, implicit instantiations of templates), but must not be
4957 called for template declarations. */
4960 start_decl_1 (tree decl
, bool initialized
)
4964 bool aggregate_definition_p
;
4966 gcc_assert (!processing_template_decl
);
4968 if (error_operand_p (decl
))
4971 gcc_assert (VAR_P (decl
));
4973 type
= TREE_TYPE (decl
);
4974 complete_p
= COMPLETE_TYPE_P (type
);
4975 aggregate_definition_p
= MAYBE_CLASS_TYPE_P (type
) && !DECL_EXTERNAL (decl
);
4977 /* If an explicit initializer is present, or if this is a definition
4978 of an aggregate, then we need a complete type at this point.
4979 (Scalars are always complete types, so there is nothing to
4980 check.) This code just sets COMPLETE_P; errors (if necessary)
4981 are issued below. */
4982 if ((initialized
|| aggregate_definition_p
)
4984 && COMPLETE_TYPE_P (complete_type (type
)))
4987 /* We will not yet have set TREE_READONLY on DECL if the type
4988 was "const", but incomplete, before this point. But, now, we
4989 have a complete type, so we can try again. */
4990 cp_apply_type_quals_to_decl (cp_type_quals (type
), decl
);
4994 /* Is it valid for this decl to have an initializer at all? */
4996 /* Don't allow initializations for incomplete types except for
4997 arrays which might be completed by the initialization. */
4999 ; /* A complete type is ok. */
5000 else if (type_uses_auto (type
))
5001 ; /* An auto type is ok. */
5002 else if (TREE_CODE (type
) != ARRAY_TYPE
)
5004 error ("variable %q#D has initializer but incomplete type", decl
);
5005 type
= TREE_TYPE (decl
) = error_mark_node
;
5007 else if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type
))))
5009 if (DECL_LANG_SPECIFIC (decl
) && DECL_TEMPLATE_INFO (decl
))
5010 error ("elements of array %q#D have incomplete type", decl
);
5011 /* else we already gave an error in start_decl. */
5014 else if (aggregate_definition_p
&& !complete_p
)
5016 if (type_uses_auto (type
))
5017 error ("declaration of %q#D has no initializer", decl
);
5019 error ("aggregate %q#D has incomplete type and cannot be defined",
5021 /* Change the type so that assemble_variable will give
5022 DECL an rtl we can live with: (mem (const_int 0)). */
5023 type
= TREE_TYPE (decl
) = error_mark_node
;
5026 /* Create a new scope to hold this declaration if necessary.
5027 Whether or not a new scope is necessary cannot be determined
5028 until after the type has been completed; if the type is a
5029 specialization of a class template it is not until after
5030 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
5031 will be set correctly. */
5032 maybe_push_cleanup_level (type
);
5035 /* Handle initialization of references. DECL, TYPE, and INIT have the
5036 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
5037 but will be set to a new CLEANUP_STMT if a temporary is created
5038 that must be destroyed subsequently.
5040 Returns an initializer expression to use to initialize DECL, or
5041 NULL if the initialization can be performed statically.
5043 Quotes on semantics can be found in ARM 8.4.3. */
5046 grok_reference_init (tree decl
, tree type
, tree init
, int flags
)
5048 if (init
== NULL_TREE
)
5050 if ((DECL_LANG_SPECIFIC (decl
) == 0
5051 || DECL_IN_AGGR_P (decl
) == 0)
5052 && ! DECL_THIS_EXTERN (decl
))
5053 error ("%qD declared as reference but not initialized", decl
);
5057 if (TREE_CODE (init
) == TREE_LIST
)
5058 init
= build_x_compound_expr_from_list (init
, ELK_INIT
,
5059 tf_warning_or_error
);
5061 tree ttype
= TREE_TYPE (type
);
5062 if (TREE_CODE (ttype
) != ARRAY_TYPE
5063 && TREE_CODE (TREE_TYPE (init
)) == ARRAY_TYPE
)
5064 /* Note: default conversion is only called in very special cases. */
5065 init
= decay_conversion (init
, tf_warning_or_error
);
5067 /* check_initializer handles this for non-reference variables, but for
5068 references we need to do it here or the initializer will get the
5069 incomplete array type and confuse later calls to
5070 cp_complete_array_type. */
5071 if (TREE_CODE (ttype
) == ARRAY_TYPE
5072 && TYPE_DOMAIN (ttype
) == NULL_TREE
5073 && (BRACE_ENCLOSED_INITIALIZER_P (init
)
5074 || TREE_CODE (init
) == STRING_CST
))
5076 cp_complete_array_type (&ttype
, init
, false);
5077 if (ttype
!= TREE_TYPE (type
))
5078 type
= cp_build_reference_type (ttype
, TYPE_REF_IS_RVALUE (type
));
5081 /* Convert INIT to the reference type TYPE. This may involve the
5082 creation of a temporary, whose lifetime must be the same as that
5083 of the reference. If so, a DECL_EXPR for the temporary will be
5084 added just after the DECL_EXPR for DECL. That's why we don't set
5085 DECL_INITIAL for local references (instead assigning to them
5086 explicitly); we need to allow the temporary to be initialized
5088 return initialize_reference (type
, init
, flags
,
5089 tf_warning_or_error
);
5092 /* Designated initializers in arrays are not supported in GNU C++.
5093 The parser cannot detect this error since it does not know whether
5094 a given brace-enclosed initializer is for a class type or for an
5095 array. This function checks that CE does not use a designated
5096 initializer. If it does, an error is issued. Returns true if CE
5097 is valid, i.e., does not have a designated initializer. */
5100 check_array_designated_initializer (constructor_elt
*ce
,
5101 unsigned HOST_WIDE_INT index
)
5103 /* Designated initializers for array elements are not supported. */
5106 /* The parser only allows identifiers as designated
5108 if (ce
->index
== error_mark_node
)
5110 error ("name used in a GNU-style designated "
5111 "initializer for an array");
5114 else if (identifier_p (ce
->index
))
5116 error ("name %qD used in a GNU-style designated "
5117 "initializer for an array", ce
->index
);
5121 tree ce_index
= build_expr_type_conversion (WANT_INT
| WANT_ENUM
,
5124 && INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (ce_index
))
5125 && (TREE_CODE (ce_index
= maybe_constant_value (ce_index
))
5128 /* A C99 designator is OK if it matches the current index. */
5129 if (wi::eq_p (ce_index
, index
))
5132 sorry ("non-trivial designated initializers not supported");
5135 error ("C99 designator %qE is not an integral constant-expression",
5144 /* When parsing `int a[] = {1, 2};' we don't know the size of the
5145 array until we finish parsing the initializer. If that's the
5146 situation we're in, update DECL accordingly. */
5149 maybe_deduce_size_from_array_init (tree decl
, tree init
)
5151 tree type
= TREE_TYPE (decl
);
5153 if (TREE_CODE (type
) == ARRAY_TYPE
5154 && TYPE_DOMAIN (type
) == NULL_TREE
5155 && TREE_CODE (decl
) != TYPE_DECL
)
5157 /* do_default is really a C-ism to deal with tentative definitions.
5158 But let's leave it here to ease the eventual merge. */
5159 int do_default
= !DECL_EXTERNAL (decl
);
5160 tree initializer
= init
? init
: DECL_INITIAL (decl
);
5163 /* Check that there are no designated initializers in INIT, as
5164 those are not supported in GNU C++, and as the middle-end
5165 will crash if presented with a non-numeric designated
5167 if (initializer
&& BRACE_ENCLOSED_INITIALIZER_P (initializer
))
5169 vec
<constructor_elt
, va_gc
> *v
= CONSTRUCTOR_ELTS (initializer
);
5170 constructor_elt
*ce
;
5172 FOR_EACH_VEC_SAFE_ELT (v
, i
, ce
)
5173 if (!check_array_designated_initializer (ce
, i
))
5179 failure
= cp_complete_array_type (&TREE_TYPE (decl
), initializer
,
5183 error ("initializer fails to determine size of %qD", decl
);
5185 else if (failure
== 2)
5189 error ("array size missing in %qD", decl
);
5191 /* If a `static' var's size isn't known, make it extern as
5192 well as static, so it does not get allocated. If it's not
5193 `static', then don't mark it extern; finish_incomplete_decl
5194 will give it a default size and it will get allocated. */
5195 else if (!pedantic
&& TREE_STATIC (decl
) && !TREE_PUBLIC (decl
))
5196 DECL_EXTERNAL (decl
) = 1;
5198 else if (failure
== 3)
5200 error ("zero-size array %qD", decl
);
5204 cp_apply_type_quals_to_decl (cp_type_quals (TREE_TYPE (decl
)), decl
);
5206 relayout_decl (decl
);
5210 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
5211 any appropriate error messages regarding the layout. */
5214 layout_var_decl (tree decl
)
5218 type
= TREE_TYPE (decl
);
5219 if (type
== error_mark_node
)
5222 /* If we haven't already laid out this declaration, do so now.
5223 Note that we must not call complete type for an external object
5224 because it's type might involve templates that we are not
5225 supposed to instantiate yet. (And it's perfectly valid to say
5226 `extern X x' for some incomplete type `X'.) */
5227 if (!DECL_EXTERNAL (decl
))
5228 complete_type (type
);
5229 if (!DECL_SIZE (decl
)
5230 && TREE_TYPE (decl
) != error_mark_node
5231 && (COMPLETE_TYPE_P (type
)
5232 || (TREE_CODE (type
) == ARRAY_TYPE
5233 && !TYPE_DOMAIN (type
)
5234 && COMPLETE_TYPE_P (TREE_TYPE (type
)))))
5235 layout_decl (decl
, 0);
5237 if (!DECL_EXTERNAL (decl
) && DECL_SIZE (decl
) == NULL_TREE
)
5239 /* An automatic variable with an incomplete type: that is an error.
5240 Don't talk about array types here, since we took care of that
5241 message in grokdeclarator. */
5242 error ("storage size of %qD isn%'t known", decl
);
5243 TREE_TYPE (decl
) = error_mark_node
;
5246 /* Keep this code around in case we later want to control debug info
5247 based on whether a type is "used". (jason 1999-11-11) */
5249 else if (!DECL_EXTERNAL (decl
) && MAYBE_CLASS_TYPE_P (ttype
))
5250 /* Let debugger know it should output info for this type. */
5251 note_debug_info_needed (ttype
);
5253 if (TREE_STATIC (decl
) && DECL_CLASS_SCOPE_P (decl
))
5254 note_debug_info_needed (DECL_CONTEXT (decl
));
5257 if ((DECL_EXTERNAL (decl
) || TREE_STATIC (decl
))
5258 && DECL_SIZE (decl
) != NULL_TREE
5259 && ! TREE_CONSTANT (DECL_SIZE (decl
)))
5261 if (TREE_CODE (DECL_SIZE (decl
)) == INTEGER_CST
)
5262 constant_expression_warning (DECL_SIZE (decl
));
5265 error ("storage size of %qD isn%'t constant", decl
);
5266 TREE_TYPE (decl
) = error_mark_node
;
5271 /* If a local static variable is declared in an inline function, or if
5272 we have a weak definition, we must endeavor to create only one
5273 instance of the variable at link-time. */
5276 maybe_commonize_var (tree decl
)
5278 /* Static data in a function with comdat linkage also has comdat
5280 if (TREE_STATIC (decl
)
5281 /* Don't mess with __FUNCTION__. */
5282 && ! DECL_ARTIFICIAL (decl
)
5283 && DECL_FUNCTION_SCOPE_P (decl
)
5284 && vague_linkage_p (DECL_CONTEXT (decl
)))
5288 /* With weak symbols, we simply make the variable COMDAT;
5289 that will cause copies in multiple translations units to
5291 comdat_linkage (decl
);
5295 if (DECL_INITIAL (decl
) == NULL_TREE
5296 || DECL_INITIAL (decl
) == error_mark_node
)
5298 /* Without weak symbols, we can use COMMON to merge
5299 uninitialized variables. */
5300 TREE_PUBLIC (decl
) = 1;
5301 DECL_COMMON (decl
) = 1;
5305 /* While for initialized variables, we must use internal
5306 linkage -- which means that multiple copies will not
5308 TREE_PUBLIC (decl
) = 0;
5309 DECL_COMMON (decl
) = 0;
5310 if (warning_at (DECL_SOURCE_LOCATION (decl
), 0,
5311 "sorry: semantics of inline function static "
5312 "data %q#D are wrong (you%'ll wind up "
5313 "with multiple copies)", decl
))
5314 inform (DECL_SOURCE_LOCATION (decl
),
5315 "you can work around this by removing the initializer");
5321 /* Issue an error message if DECL is an uninitialized const variable. */
5324 check_for_uninitialized_const_var (tree decl
)
5326 tree type
= strip_array_types (TREE_TYPE (decl
));
5328 /* ``Unless explicitly declared extern, a const object does not have
5329 external linkage and must be initialized. ($8.4; $12.1)'' ARM
5332 && TREE_CODE (type
) != REFERENCE_TYPE
5333 && (CP_TYPE_CONST_P (type
) || var_in_constexpr_fn (decl
))
5334 && !DECL_INITIAL (decl
))
5336 tree field
= default_init_uninitialized_part (type
);
5340 if (CP_TYPE_CONST_P (type
))
5341 permerror (DECL_SOURCE_LOCATION (decl
),
5342 "uninitialized const %qD", decl
);
5345 error_at (DECL_SOURCE_LOCATION (decl
),
5346 "uninitialized variable %qD in %<constexpr%> function",
5348 cp_function_chain
->invalid_constexpr
= true;
5351 if (CLASS_TYPE_P (type
))
5353 tree defaulted_ctor
;
5355 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (type
)),
5356 "%q#T has no user-provided default constructor", type
);
5357 defaulted_ctor
= in_class_defaulted_default_constructor (type
);
5359 inform (DECL_SOURCE_LOCATION (defaulted_ctor
),
5360 "constructor is not user-provided because it is "
5361 "explicitly defaulted in the class body");
5362 inform (DECL_SOURCE_LOCATION (field
),
5363 "and the implicitly-defined constructor does not "
5364 "initialize %q#D", field
);
5369 /* Structure holding the current initializer being processed by reshape_init.
5370 CUR is a pointer to the current element being processed, END is a pointer
5371 after the last element present in the initializer. */
5374 constructor_elt
*cur
;
5375 constructor_elt
*end
;
5378 static tree
reshape_init_r (tree
, reshape_iter
*, bool, tsubst_flags_t
);
5380 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
5381 returned is the next FIELD_DECL (possibly FIELD itself) that can be
5382 initialized. If there are no more such fields, the return value
5386 next_initializable_field (tree field
)
5389 && (TREE_CODE (field
) != FIELD_DECL
5390 || (DECL_C_BIT_FIELD (field
) && !DECL_NAME (field
))
5391 || DECL_ARTIFICIAL (field
)))
5392 field
= DECL_CHAIN (field
);
5397 /* Subroutine of reshape_init_array and reshape_init_vector, which does
5398 the actual work. ELT_TYPE is the element type of the array. MAX_INDEX is an
5399 INTEGER_CST representing the size of the array minus one (the maximum index),
5400 or NULL_TREE if the array was declared without specifying the size. D is
5401 the iterator within the constructor. */
5404 reshape_init_array_1 (tree elt_type
, tree max_index
, reshape_iter
*d
,
5405 tsubst_flags_t complain
)
5408 bool sized_array_p
= (max_index
&& TREE_CONSTANT (max_index
));
5409 unsigned HOST_WIDE_INT max_index_cst
= 0;
5410 unsigned HOST_WIDE_INT index
;
5412 /* The initializer for an array is always a CONSTRUCTOR. */
5413 new_init
= build_constructor (init_list_type_node
, NULL
);
5417 /* Minus 1 is used for zero sized arrays. */
5418 if (integer_all_onesp (max_index
))
5421 if (tree_fits_uhwi_p (max_index
))
5422 max_index_cst
= tree_to_uhwi (max_index
);
5423 /* sizetype is sign extended, not zero extended. */
5425 max_index_cst
= tree_to_uhwi (fold_convert (size_type_node
, max_index
));
5428 /* Loop until there are no more initializers. */
5430 d
->cur
!= d
->end
&& (!sized_array_p
|| index
<= max_index_cst
);
5434 constructor_elt
*old_cur
= d
->cur
;
5436 check_array_designated_initializer (d
->cur
, index
);
5437 elt_init
= reshape_init_r (elt_type
, d
, /*first_initializer_p=*/false,
5439 if (elt_init
== error_mark_node
)
5440 return error_mark_node
;
5441 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init
),
5442 size_int (index
), elt_init
);
5443 if (!TREE_CONSTANT (elt_init
))
5444 TREE_CONSTANT (new_init
) = false;
5446 /* This can happen with an invalid initializer (c++/54501). */
5447 if (d
->cur
== old_cur
&& !sized_array_p
)
5454 /* Subroutine of reshape_init_r, processes the initializers for arrays.
5455 Parameters are the same of reshape_init_r. */
5458 reshape_init_array (tree type
, reshape_iter
*d
, tsubst_flags_t complain
)
5460 tree max_index
= NULL_TREE
;
5462 gcc_assert (TREE_CODE (type
) == ARRAY_TYPE
);
5464 if (TYPE_DOMAIN (type
))
5465 max_index
= array_type_nelts (type
);
5467 return reshape_init_array_1 (TREE_TYPE (type
), max_index
, d
, complain
);
5470 /* Subroutine of reshape_init_r, processes the initializers for vectors.
5471 Parameters are the same of reshape_init_r. */
5474 reshape_init_vector (tree type
, reshape_iter
*d
, tsubst_flags_t complain
)
5476 tree max_index
= NULL_TREE
;
5478 gcc_assert (VECTOR_TYPE_P (type
));
5480 if (COMPOUND_LITERAL_P (d
->cur
->value
))
5482 tree value
= d
->cur
->value
;
5483 if (!same_type_p (TREE_TYPE (value
), type
))
5485 if (complain
& tf_error
)
5486 error ("invalid type %qT as initializer for a vector of type %qT",
5487 TREE_TYPE (d
->cur
->value
), type
);
5488 value
= error_mark_node
;
5494 /* For a vector, we initialize it as an array of the appropriate size. */
5495 if (VECTOR_TYPE_P (type
))
5496 max_index
= size_int (TYPE_VECTOR_SUBPARTS (type
) - 1);
5498 return reshape_init_array_1 (TREE_TYPE (type
), max_index
, d
, complain
);
5501 /* Subroutine of reshape_init_r, processes the initializers for classes
5502 or union. Parameters are the same of reshape_init_r. */
5505 reshape_init_class (tree type
, reshape_iter
*d
, bool first_initializer_p
,
5506 tsubst_flags_t complain
)
5511 gcc_assert (CLASS_TYPE_P (type
));
5513 /* The initializer for a class is always a CONSTRUCTOR. */
5514 new_init
= build_constructor (init_list_type_node
, NULL
);
5515 field
= next_initializable_field (TYPE_FIELDS (type
));
5521 An initializer for an aggregate member that is an
5522 empty class shall have the form of an empty
5523 initializer-list {}. */
5524 if (!first_initializer_p
)
5526 if (complain
& tf_error
)
5527 error ("initializer for %qT must be brace-enclosed", type
);
5528 return error_mark_node
;
5533 /* Loop through the initializable fields, gathering initializers. */
5534 while (d
->cur
!= d
->end
)
5537 constructor_elt
*old_cur
= d
->cur
;
5539 /* Handle designated initializers, as an extension. */
5542 if (d
->cur
->index
== error_mark_node
)
5543 return error_mark_node
;
5545 if (TREE_CODE (d
->cur
->index
) == FIELD_DECL
)
5546 /* We already reshaped this. */
5547 gcc_assert (d
->cur
->index
== field
);
5548 else if (TREE_CODE (d
->cur
->index
) == IDENTIFIER_NODE
)
5549 field
= lookup_field_1 (type
, d
->cur
->index
, /*want_type=*/false);
5552 if (complain
& tf_error
)
5553 error ("%<[%E] =%> used in a GNU-style designated initializer"
5554 " for class %qT", d
->cur
->index
, type
);
5555 return error_mark_node
;
5558 if (!field
|| TREE_CODE (field
) != FIELD_DECL
)
5560 if (complain
& tf_error
)
5561 error ("%qT has no non-static data member named %qD", type
,
5563 return error_mark_node
;
5567 /* If we processed all the member of the class, we are done. */
5571 field_init
= reshape_init_r (TREE_TYPE (field
), d
,
5572 /*first_initializer_p=*/false, complain
);
5573 if (field_init
== error_mark_node
)
5574 return error_mark_node
;
5576 if (d
->cur
== old_cur
&& d
->cur
->index
)
5578 /* This can happen with an invalid initializer for a flexible
5579 array member (c++/54441). */
5580 if (complain
& tf_error
)
5581 error ("invalid initializer for %q#D", field
);
5582 return error_mark_node
;
5585 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init
), field
, field_init
);
5589 When a union is initialized with a brace-enclosed
5590 initializer, the braces shall only contain an
5591 initializer for the first member of the union. */
5592 if (TREE_CODE (type
) == UNION_TYPE
)
5595 field
= next_initializable_field (DECL_CHAIN (field
));
5601 /* Subroutine of reshape_init_r. We're in a context where C99 initializer
5602 designators are not valid; either complain or return true to indicate
5603 that reshape_init_r should return error_mark_node. */
5606 has_designator_problem (reshape_iter
*d
, tsubst_flags_t complain
)
5610 if (complain
& tf_error
)
5611 error ("C99 designator %qE outside aggregate initializer",
5619 /* Subroutine of reshape_init, which processes a single initializer (part of
5620 a CONSTRUCTOR). TYPE is the type of the variable being initialized, D is the
5621 iterator within the CONSTRUCTOR which points to the initializer to process.
5622 FIRST_INITIALIZER_P is true if this is the first initializer of the
5623 outermost CONSTRUCTOR node. */
5626 reshape_init_r (tree type
, reshape_iter
*d
, bool first_initializer_p
,
5627 tsubst_flags_t complain
)
5629 tree init
= d
->cur
->value
;
5631 if (error_operand_p (init
))
5632 return error_mark_node
;
5634 if (first_initializer_p
&& !CP_AGGREGATE_TYPE_P (type
)
5635 && has_designator_problem (d
, complain
))
5636 return error_mark_node
;
5638 if (TREE_CODE (type
) == COMPLEX_TYPE
)
5640 /* A complex type can be initialized from one or two initializers,
5641 but braces are not elided. */
5643 if (BRACE_ENCLOSED_INITIALIZER_P (init
))
5645 if (CONSTRUCTOR_NELTS (init
) > 2)
5647 if (complain
& tf_error
)
5648 error ("too many initializers for %qT", type
);
5650 return error_mark_node
;
5653 else if (first_initializer_p
&& d
->cur
!= d
->end
)
5655 vec
<constructor_elt
, va_gc
> *v
= 0;
5656 CONSTRUCTOR_APPEND_ELT (v
, NULL_TREE
, init
);
5657 CONSTRUCTOR_APPEND_ELT (v
, NULL_TREE
, d
->cur
->value
);
5658 if (has_designator_problem (d
, complain
))
5659 return error_mark_node
;
5661 init
= build_constructor (init_list_type_node
, v
);
5666 /* A non-aggregate type is always initialized with a single
5668 if (!CP_AGGREGATE_TYPE_P (type
))
5670 /* It is invalid to initialize a non-aggregate type with a
5671 brace-enclosed initializer before C++0x.
5672 We need to check for BRACE_ENCLOSED_INITIALIZER_P here because
5673 of g++.old-deja/g++.mike/p7626.C: a pointer-to-member constant is
5674 a CONSTRUCTOR (with a record type). */
5675 if (TREE_CODE (init
) == CONSTRUCTOR
5676 /* Don't complain about a capture-init. */
5677 && !CONSTRUCTOR_IS_DIRECT_INIT (init
)
5678 && BRACE_ENCLOSED_INITIALIZER_P (init
)) /* p7626.C */
5680 if (SCALAR_TYPE_P (type
))
5682 if (cxx_dialect
< cxx11
5683 /* Isn't value-initialization. */
5684 || CONSTRUCTOR_NELTS (init
) > 0)
5686 if (complain
& tf_error
)
5687 error ("braces around scalar initializer for type %qT",
5689 init
= error_mark_node
;
5693 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS
);
5700 /* "If T is a class type and the initializer list has a single element of
5701 type cv U, where U is T or a class derived from T, the object is
5702 initialized from that element." Even if T is an aggregate. */
5703 if (cxx_dialect
>= cxx11
&& (CLASS_TYPE_P (type
) || VECTOR_TYPE_P (type
))
5704 && first_initializer_p
5705 && d
->end
- d
->cur
== 1
5706 && reference_related_p (type
, TREE_TYPE (init
)))
5714 All implicit type conversions (clause _conv_) are considered when
5715 initializing the aggregate member with an initializer from an
5716 initializer-list. If the initializer can initialize a member,
5717 the member is initialized. Otherwise, if the member is itself a
5718 non-empty subaggregate, brace elision is assumed and the
5719 initializer is considered for the initialization of the first
5720 member of the subaggregate. */
5721 if (TREE_CODE (init
) != CONSTRUCTOR
5722 /* But don't try this for the first initializer, since that would be
5723 looking through the outermost braces; A a2 = { a1 }; is not a
5724 valid aggregate initialization. */
5725 && !first_initializer_p
5726 && (same_type_ignoring_top_level_qualifiers_p (type
, TREE_TYPE (init
))
5727 || can_convert_arg (type
, TREE_TYPE (init
), init
, LOOKUP_NORMAL
,
5734 /* [dcl.init.string]
5736 A char array (whether plain char, signed char, or unsigned char)
5737 can be initialized by a string-literal (optionally enclosed in
5738 braces); a wchar_t array can be initialized by a wide
5739 string-literal (optionally enclosed in braces). */
5740 if (TREE_CODE (type
) == ARRAY_TYPE
5741 && char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (type
))))
5743 tree str_init
= init
;
5745 /* Strip one level of braces if and only if they enclose a single
5746 element (as allowed by [dcl.init.string]). */
5747 if (!first_initializer_p
5748 && TREE_CODE (str_init
) == CONSTRUCTOR
5749 && vec_safe_length (CONSTRUCTOR_ELTS (str_init
)) == 1)
5751 str_init
= (*CONSTRUCTOR_ELTS (str_init
))[0].value
;
5754 /* If it's a string literal, then it's the initializer for the array
5755 as a whole. Otherwise, continue with normal initialization for
5756 array types (one value per array element). */
5757 if (TREE_CODE (str_init
) == STRING_CST
)
5759 if (has_designator_problem (d
, complain
))
5760 return error_mark_node
;
5766 /* The following cases are about aggregates. If we are not within a full
5767 initializer already, and there is not a CONSTRUCTOR, it means that there
5768 is a missing set of braces (that is, we are processing the case for
5769 which reshape_init exists). */
5770 if (!first_initializer_p
)
5772 if (TREE_CODE (init
) == CONSTRUCTOR
)
5774 if (TREE_TYPE (init
) && TYPE_PTRMEMFUNC_P (TREE_TYPE (init
)))
5775 /* There is no need to reshape pointer-to-member function
5776 initializers, as they are always constructed correctly
5777 by the front end. */
5779 else if (COMPOUND_LITERAL_P (init
))
5780 /* For a nested compound literal, there is no need to reshape since
5781 brace elision is not allowed. Even if we decided to allow it,
5782 we should add a call to reshape_init in finish_compound_literal,
5783 before calling digest_init, so changing this code would still
5784 not be necessary. */
5785 gcc_assert (!BRACE_ENCLOSED_INITIALIZER_P (init
));
5789 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init
));
5790 return reshape_init (type
, init
, complain
);
5794 warning (OPT_Wmissing_braces
, "missing braces around initializer for %qT",
5798 /* Dispatch to specialized routines. */
5799 if (CLASS_TYPE_P (type
))
5800 return reshape_init_class (type
, d
, first_initializer_p
, complain
);
5801 else if (TREE_CODE (type
) == ARRAY_TYPE
)
5802 return reshape_init_array (type
, d
, complain
);
5803 else if (VECTOR_TYPE_P (type
))
5804 return reshape_init_vector (type
, d
, complain
);
5809 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
5810 brace-enclosed aggregate initializer.
5812 INIT is the CONSTRUCTOR containing the list of initializers describing
5813 a brace-enclosed initializer for an entity of the indicated aggregate TYPE.
5814 It may not presently match the shape of the TYPE; for example:
5816 struct S { int a; int b; };
5817 struct S a[] = { 1, 2, 3, 4 };
5819 Here INIT will hold a vector of four elements, rather than a
5820 vector of two elements, each itself a vector of two elements. This
5821 routine transforms INIT from the former form into the latter. The
5822 revised CONSTRUCTOR node is returned. */
5825 reshape_init (tree type
, tree init
, tsubst_flags_t complain
)
5827 vec
<constructor_elt
, va_gc
> *v
;
5831 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init
));
5833 v
= CONSTRUCTOR_ELTS (init
);
5835 /* An empty constructor does not need reshaping, and it is always a valid
5837 if (vec_safe_is_empty (v
))
5840 /* Recurse on this CONSTRUCTOR. */
5842 d
.end
= d
.cur
+ v
->length ();
5844 new_init
= reshape_init_r (type
, &d
, true, complain
);
5845 if (new_init
== error_mark_node
)
5846 return error_mark_node
;
5848 /* Make sure all the element of the constructor were used. Otherwise,
5849 issue an error about exceeding initializers. */
5852 if (complain
& tf_error
)
5853 error ("too many initializers for %qT", type
);
5855 return error_mark_node
;
5861 /* Verify array initializer. Returns true if errors have been reported. */
5864 check_array_initializer (tree decl
, tree type
, tree init
)
5866 tree element_type
= TREE_TYPE (type
);
5868 /* The array type itself need not be complete, because the
5869 initializer may tell us how many elements are in the array.
5870 But, the elements of the array must be complete. */
5871 if (!COMPLETE_TYPE_P (complete_type (element_type
)))
5874 error ("elements of array %q#D have incomplete type", decl
);
5876 error ("elements of array %q#T have incomplete type", type
);
5879 /* A compound literal can't have variable size. */
5881 && ((COMPLETE_TYPE_P (type
) && !TREE_CONSTANT (TYPE_SIZE (type
)))
5882 || !TREE_CONSTANT (TYPE_SIZE (element_type
))))
5884 error ("variable-sized compound literal");
5890 /* Subroutine of check_initializer; args are passed down from that function.
5891 Set stmts_are_full_exprs_p to 1 across a call to build_aggr_init. */
5894 build_aggr_init_full_exprs (tree decl
, tree init
, int flags
)
5897 gcc_assert (stmts_are_full_exprs_p ());
5898 return build_aggr_init (decl
, init
, flags
, tf_warning_or_error
);
5901 /* Verify INIT (the initializer for DECL), and record the
5902 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
5903 grok_reference_init.
5905 If the return value is non-NULL, it is an expression that must be
5906 evaluated dynamically to initialize DECL. */
5909 check_initializer (tree decl
, tree init
, int flags
, vec
<tree
, va_gc
> **cleanups
)
5911 tree type
= TREE_TYPE (decl
);
5912 tree init_code
= NULL
;
5915 /* Things that are going to be initialized need to have complete
5917 TREE_TYPE (decl
) = type
= complete_type (TREE_TYPE (decl
));
5919 if (DECL_HAS_VALUE_EXPR_P (decl
))
5921 /* A variable with DECL_HAS_VALUE_EXPR_P set is just a placeholder,
5922 it doesn't have storage to be initialized. */
5923 gcc_assert (init
== NULL_TREE
);
5927 if (type
== error_mark_node
)
5928 /* We will have already complained. */
5931 if (TREE_CODE (type
) == ARRAY_TYPE
)
5933 if (check_array_initializer (decl
, type
, init
))
5936 else if (!COMPLETE_TYPE_P (type
))
5938 error ("%q#D has incomplete type", decl
);
5939 TREE_TYPE (decl
) = error_mark_node
;
5943 /* There is no way to make a variable-sized class type in GNU C++. */
5944 gcc_assert (TREE_CONSTANT (TYPE_SIZE (type
)));
5946 if (init
&& BRACE_ENCLOSED_INITIALIZER_P (init
))
5948 int init_len
= vec_safe_length (CONSTRUCTOR_ELTS (init
));
5949 if (SCALAR_TYPE_P (type
))
5953 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS
);
5954 init
= build_zero_init (type
, NULL_TREE
, false);
5956 else if (init_len
!= 1 && TREE_CODE (type
) != COMPLEX_TYPE
)
5958 error ("scalar object %qD requires one element in initializer",
5960 TREE_TYPE (decl
) = error_mark_node
;
5966 if (TREE_CODE (decl
) == CONST_DECL
)
5968 gcc_assert (TREE_CODE (type
) != REFERENCE_TYPE
);
5970 DECL_INITIAL (decl
) = init
;
5972 gcc_assert (init
!= NULL_TREE
);
5975 else if (!init
&& DECL_REALLY_EXTERN (decl
))
5977 else if (init
|| type_build_ctor_call (type
)
5978 || TREE_CODE (type
) == REFERENCE_TYPE
)
5980 if (TREE_CODE (type
) == REFERENCE_TYPE
)
5982 init
= grok_reference_init (decl
, type
, init
, flags
);
5983 flags
|= LOOKUP_ALREADY_DIGESTED
;
5986 check_for_uninitialized_const_var (decl
);
5987 /* Do not reshape constructors of vectors (they don't need to be
5989 else if (BRACE_ENCLOSED_INITIALIZER_P (init
))
5991 if (is_std_init_list (type
))
5993 init
= perform_implicit_conversion (type
, init
,
5994 tf_warning_or_error
);
5995 flags
|= LOOKUP_ALREADY_DIGESTED
;
5997 else if (TYPE_NON_AGGREGATE_CLASS (type
))
5999 /* Don't reshape if the class has constructors. */
6000 if (cxx_dialect
== cxx98
)
6001 error ("in C++98 %qD must be initialized by constructor, "
6005 else if (VECTOR_TYPE_P (type
) && TYPE_VECTOR_OPAQUE (type
))
6007 error ("opaque vector types cannot be initialized");
6008 init
= error_mark_node
;
6012 init
= reshape_init (type
, init
, tf_warning_or_error
);
6013 flags
|= LOOKUP_NO_NARROWING
;
6016 else if (TREE_CODE (init
) == TREE_LIST
6017 && TREE_TYPE (init
) != unknown_type_node
6018 && !MAYBE_CLASS_TYPE_P (type
))
6020 gcc_assert (TREE_CODE (decl
) != RESULT_DECL
);
6022 /* We get here with code like `int a (2);' */
6023 init
= build_x_compound_expr_from_list (init
, ELK_INIT
,
6024 tf_warning_or_error
);
6027 /* If DECL has an array type without a specific bound, deduce the
6028 array size from the initializer. */
6029 maybe_deduce_size_from_array_init (decl
, init
);
6030 type
= TREE_TYPE (decl
);
6031 if (type
== error_mark_node
)
6034 if ((type_build_ctor_call (type
) || CLASS_TYPE_P (type
))
6035 && !(flags
& LOOKUP_ALREADY_DIGESTED
)
6036 && !(init
&& BRACE_ENCLOSED_INITIALIZER_P (init
)
6037 && CP_AGGREGATE_TYPE_P (type
)
6038 && (CLASS_TYPE_P (type
)
6039 || !TYPE_NEEDS_CONSTRUCTING (type
)
6040 || type_has_extended_temps (type
))))
6042 init_code
= build_aggr_init_full_exprs (decl
, init
, flags
);
6044 /* A constructor call is a non-trivial initializer even if
6045 it isn't explicitly written. */
6046 if (TREE_SIDE_EFFECTS (init_code
))
6047 DECL_NONTRIVIALLY_INITIALIZED_P (decl
) = true;
6049 /* If this is a constexpr initializer, expand_default_init will
6050 have returned an INIT_EXPR rather than a CALL_EXPR. In that
6051 case, pull the initializer back out and pass it down into
6052 store_init_value. */
6053 while (TREE_CODE (init_code
) == EXPR_STMT
6054 || TREE_CODE (init_code
) == CONVERT_EXPR
)
6055 init_code
= TREE_OPERAND (init_code
, 0);
6056 if (TREE_CODE (init_code
) == INIT_EXPR
)
6058 init
= TREE_OPERAND (init_code
, 1);
6059 init_code
= NULL_TREE
;
6060 /* Don't call digest_init; it's unnecessary and will complain
6061 about aggregate initialization of non-aggregate classes. */
6062 flags
|= LOOKUP_ALREADY_DIGESTED
;
6064 else if (DECL_DECLARED_CONSTEXPR_P (decl
))
6066 /* Declared constexpr, but no suitable initializer; massage
6067 init appropriately so we can pass it into store_init_value
6069 if (CLASS_TYPE_P (type
)
6070 && (!init
|| TREE_CODE (init
) == TREE_LIST
))
6072 init
= build_functional_cast (type
, init
, tf_none
);
6073 if (TREE_CODE (init
) == TARGET_EXPR
)
6074 TARGET_EXPR_DIRECT_INIT_P (init
) = true;
6076 init_code
= NULL_TREE
;
6082 if (init
&& TREE_CODE (init
) != TREE_VEC
)
6084 /* In aggregate initialization of a variable, each element
6085 initialization is a full-expression because there is no
6086 enclosing expression. */
6087 gcc_assert (stmts_are_full_exprs_p ());
6089 init_code
= store_init_value (decl
, init
, cleanups
, flags
);
6091 if (pedantic
&& TREE_CODE (type
) == ARRAY_TYPE
6092 && DECL_INITIAL (decl
)
6093 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
6094 && PAREN_STRING_LITERAL_P (DECL_INITIAL (decl
)))
6095 warning (0, "array %qD initialized by parenthesized string literal %qE",
6096 decl
, DECL_INITIAL (decl
));
6102 if (CLASS_TYPE_P (core_type
= strip_array_types (type
))
6103 && (CLASSTYPE_READONLY_FIELDS_NEED_INIT (core_type
)
6104 || CLASSTYPE_REF_FIELDS_NEED_INIT (core_type
)))
6105 diagnose_uninitialized_cst_or_ref_member (core_type
, /*using_new=*/false,
6108 check_for_uninitialized_const_var (decl
);
6111 if (init
&& init
!= error_mark_node
)
6112 init_code
= build2 (INIT_EXPR
, type
, decl
, init
);
6116 /* We might have set these in cp_finish_decl. */
6117 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl
) = false;
6118 TREE_CONSTANT (decl
) = false;
6121 if (init_code
&& DECL_IN_AGGR_P (decl
))
6123 static int explained
= 0;
6125 if (cxx_dialect
< cxx11
)
6126 error ("initializer invalid for static member with constructor");
6128 error ("non-constant in-class initialization invalid for static "
6129 "member %qD", decl
);
6132 inform (input_location
,
6133 "(an out of class initialization is required)");
6142 /* If DECL is not a local variable, give it RTL. */
6145 make_rtl_for_nonlocal_decl (tree decl
, tree init
, const char* asmspec
)
6147 int toplev
= toplevel_bindings_p ();
6150 /* Set the DECL_ASSEMBLER_NAME for the object. */
6153 /* The `register' keyword, when used together with an
6154 asm-specification, indicates that the variable should be
6155 placed in a particular register. */
6156 if (VAR_P (decl
) && DECL_REGISTER (decl
))
6158 set_user_assembler_name (decl
, asmspec
);
6159 DECL_HARD_REGISTER (decl
) = 1;
6163 if (TREE_CODE (decl
) == FUNCTION_DECL
6164 && DECL_BUILT_IN_CLASS (decl
) == BUILT_IN_NORMAL
)
6165 set_builtin_user_assembler_name (decl
, asmspec
);
6166 set_user_assembler_name (decl
, asmspec
);
6170 /* Handle non-variables up front. */
6173 rest_of_decl_compilation (decl
, toplev
, at_eof
);
6177 /* If we see a class member here, it should be a static data
6179 if (DECL_LANG_SPECIFIC (decl
) && DECL_IN_AGGR_P (decl
))
6181 gcc_assert (TREE_STATIC (decl
));
6182 /* An in-class declaration of a static data member should be
6183 external; it is only a declaration, and not a definition. */
6184 if (init
== NULL_TREE
)
6185 gcc_assert (DECL_EXTERNAL (decl
) || !TREE_PUBLIC (decl
));
6188 /* We don't create any RTL for local variables. */
6189 if (DECL_FUNCTION_SCOPE_P (decl
) && !TREE_STATIC (decl
))
6192 /* We defer emission of local statics until the corresponding
6193 DECL_EXPR is expanded. */
6194 defer_p
= DECL_FUNCTION_SCOPE_P (decl
) || DECL_VIRTUAL_P (decl
);
6196 /* Defer template instantiations. */
6197 if (DECL_LANG_SPECIFIC (decl
)
6198 && DECL_IMPLICIT_INSTANTIATION (decl
))
6201 /* If we're not deferring, go ahead and assemble the variable. */
6203 rest_of_decl_compilation (decl
, toplev
, at_eof
);
6206 /* walk_tree helper for wrap_temporary_cleanups, below. */
6209 wrap_cleanups_r (tree
*stmt_p
, int *walk_subtrees
, void *data
)
6211 /* Stop at types or full-expression boundaries. */
6212 if (TYPE_P (*stmt_p
)
6213 || TREE_CODE (*stmt_p
) == CLEANUP_POINT_EXPR
)
6219 if (TREE_CODE (*stmt_p
) == TARGET_EXPR
)
6221 tree guard
= (tree
)data
;
6222 tree tcleanup
= TARGET_EXPR_CLEANUP (*stmt_p
);
6224 tcleanup
= build2 (TRY_CATCH_EXPR
, void_type_node
, tcleanup
, guard
);
6225 /* Tell honor_protect_cleanup_actions to handle this as a separate
6227 TRY_CATCH_IS_CLEANUP (tcleanup
) = 1;
6229 TARGET_EXPR_CLEANUP (*stmt_p
) = tcleanup
;
6235 /* We're initializing a local variable which has a cleanup GUARD. If there
6236 are any temporaries used in the initializer INIT of this variable, we
6237 need to wrap their cleanups with TRY_CATCH_EXPR (, GUARD) so that the
6238 variable will be cleaned up properly if one of them throws.
6240 Unfortunately, there's no way to express this properly in terms of
6241 nesting, as the regions for the temporaries overlap the region for the
6242 variable itself; if there are two temporaries, the variable needs to be
6243 the first thing destroyed if either of them throws. However, we only
6244 want to run the variable's cleanup if it actually got constructed. So
6245 we need to guard the temporary cleanups with the variable's cleanup if
6246 they are run on the normal path, but not if they are run on the
6247 exceptional path. We implement this by telling
6248 honor_protect_cleanup_actions to strip the variable cleanup from the
6249 exceptional path. */
6252 wrap_temporary_cleanups (tree init
, tree guard
)
6254 cp_walk_tree_without_duplicates (&init
, wrap_cleanups_r
, (void *)guard
);
6257 /* Generate code to initialize DECL (a local variable). */
6260 initialize_local_var (tree decl
, tree init
)
6262 tree type
= TREE_TYPE (decl
);
6266 gcc_assert (VAR_P (decl
)
6267 || TREE_CODE (decl
) == RESULT_DECL
);
6268 gcc_assert (!TREE_STATIC (decl
));
6270 if (DECL_SIZE (decl
) == NULL_TREE
)
6272 /* If we used it already as memory, it must stay in memory. */
6273 DECL_INITIAL (decl
) = NULL_TREE
;
6274 TREE_ADDRESSABLE (decl
) = TREE_USED (decl
);
6278 if (type
== error_mark_node
)
6281 /* Compute and store the initial value. */
6282 already_used
= TREE_USED (decl
) || TREE_USED (type
);
6283 if (TREE_USED (type
))
6284 DECL_READ_P (decl
) = 1;
6286 /* Generate a cleanup, if necessary. */
6287 cleanup
= cxx_maybe_build_cleanup (decl
, tf_warning_or_error
);
6289 /* Perform the initialization. */
6292 tree rinit
= (TREE_CODE (init
) == INIT_EXPR
6293 ? TREE_OPERAND (init
, 1) : NULL_TREE
);
6294 if (rinit
&& !TREE_SIDE_EFFECTS (rinit
))
6296 /* Stick simple initializers in DECL_INITIAL so that
6297 -Wno-init-self works (c++/34772). */
6298 gcc_assert (TREE_OPERAND (init
, 0) == decl
);
6299 DECL_INITIAL (decl
) = rinit
;
6301 if (warn_init_self
&& TREE_CODE (type
) == REFERENCE_TYPE
)
6305 warning_at (DECL_SOURCE_LOCATION (decl
),
6307 "reference %qD is initialized with itself", decl
);
6312 int saved_stmts_are_full_exprs_p
;
6314 /* If we're only initializing a single object, guard the
6315 destructors of any temporaries used in its initializer with
6316 its destructor. This isn't right for arrays because each
6317 element initialization is a full-expression. */
6318 if (cleanup
&& TREE_CODE (type
) != ARRAY_TYPE
)
6319 wrap_temporary_cleanups (init
, cleanup
);
6321 gcc_assert (building_stmt_list_p ());
6322 saved_stmts_are_full_exprs_p
= stmts_are_full_exprs_p ();
6323 current_stmt_tree ()->stmts_are_full_exprs_p
= 1;
6324 finish_expr_stmt (init
);
6325 current_stmt_tree ()->stmts_are_full_exprs_p
=
6326 saved_stmts_are_full_exprs_p
;
6330 /* Set this to 0 so we can tell whether an aggregate which was
6331 initialized was ever used. Don't do this if it has a
6332 destructor, so we don't complain about the 'resource
6333 allocation is initialization' idiom. Now set
6334 attribute((unused)) on types so decls of that type will be
6335 marked used. (see TREE_USED, above.) */
6336 if (TYPE_NEEDS_CONSTRUCTING (type
)
6338 && TYPE_HAS_TRIVIAL_DESTRUCTOR (type
)
6339 && DECL_NAME (decl
))
6340 TREE_USED (decl
) = 0;
6341 else if (already_used
)
6342 TREE_USED (decl
) = 1;
6345 finish_decl_cleanup (decl
, cleanup
);
6348 /* DECL is a VAR_DECL for a compiler-generated variable with static
6349 storage duration (like a virtual table) whose initializer is a
6350 compile-time constant. Initialize the variable and provide it to the
6354 initialize_artificial_var (tree decl
, vec
<constructor_elt
, va_gc
> *v
)
6357 gcc_assert (DECL_ARTIFICIAL (decl
));
6358 init
= build_constructor (TREE_TYPE (decl
), v
);
6359 gcc_assert (TREE_CODE (init
) == CONSTRUCTOR
);
6360 DECL_INITIAL (decl
) = init
;
6361 DECL_INITIALIZED_P (decl
) = 1;
6362 determine_visibility (decl
);
6363 layout_var_decl (decl
);
6364 maybe_commonize_var (decl
);
6365 make_rtl_for_nonlocal_decl (decl
, init
, /*asmspec=*/NULL
);
6368 /* INIT is the initializer for a variable, as represented by the
6369 parser. Returns true iff INIT is type-dependent. */
6372 type_dependent_init_p (tree init
)
6374 if (TREE_CODE (init
) == TREE_LIST
)
6375 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
6376 return any_type_dependent_elements_p (init
);
6377 else if (TREE_CODE (init
) == CONSTRUCTOR
)
6378 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
6380 vec
<constructor_elt
, va_gc
> *elts
;
6384 elts
= CONSTRUCTOR_ELTS (init
);
6385 nelts
= vec_safe_length (elts
);
6386 for (i
= 0; i
< nelts
; ++i
)
6387 if (type_dependent_init_p ((*elts
)[i
].value
))
6391 /* It must be a simple expression, e.g., int i = 3; */
6392 return type_dependent_expression_p (init
);
6397 /* INIT is the initializer for a variable, as represented by the
6398 parser. Returns true iff INIT is value-dependent. */
6401 value_dependent_init_p (tree init
)
6403 if (TREE_CODE (init
) == TREE_LIST
)
6404 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
6405 return any_value_dependent_elements_p (init
);
6406 else if (TREE_CODE (init
) == CONSTRUCTOR
)
6407 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
6409 vec
<constructor_elt
, va_gc
> *elts
;
6413 elts
= CONSTRUCTOR_ELTS (init
);
6414 nelts
= vec_safe_length (elts
);
6415 for (i
= 0; i
< nelts
; ++i
)
6416 if (value_dependent_init_p ((*elts
)[i
].value
))
6420 /* It must be a simple expression, e.g., int i = 3; */
6421 return value_dependent_expression_p (init
);
6426 // Returns true if a DECL is VAR_DECL with the concept specifier.
6428 is_concept_var (tree decl
)
6430 return (VAR_P (decl
)
6431 // Not all variables have DECL_LANG_SPECIFIC.
6432 && DECL_LANG_SPECIFIC (decl
)
6433 && DECL_DECLARED_CONCEPT_P (decl
));
6436 /* Finish processing of a declaration;
6437 install its line number and initial value.
6438 If the length of an array type is not known before,
6439 it must be determined now, from the initial value, or it is an error.
6441 INIT is the initializer (if any) for DECL. If INIT_CONST_EXPR_P is
6442 true, then INIT is an integral constant expression.
6444 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
6445 if the (init) syntax was used. */
6448 cp_finish_decl (tree decl
, tree init
, bool init_const_expr_p
,
6449 tree asmspec_tree
, int flags
)
6452 vec
<tree
, va_gc
> *cleanups
= NULL
;
6453 const char *asmspec
= NULL
;
6454 int was_readonly
= 0;
6455 bool var_definition_p
= false;
6458 if (decl
== error_mark_node
)
6463 error ("assignment (not initialization) in declaration");
6467 gcc_assert (TREE_CODE (decl
) != RESULT_DECL
);
6468 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
6469 gcc_assert (TREE_CODE (decl
) != PARM_DECL
);
6471 type
= TREE_TYPE (decl
);
6472 if (type
== error_mark_node
)
6475 /* If a name was specified, get the string. */
6476 if (at_namespace_scope_p ())
6477 asmspec_tree
= maybe_apply_renaming_pragma (decl
, asmspec_tree
);
6478 if (asmspec_tree
&& asmspec_tree
!= error_mark_node
)
6479 asmspec
= TREE_STRING_POINTER (asmspec_tree
);
6481 if (current_class_type
6482 && CP_DECL_CONTEXT (decl
) == current_class_type
6483 && TYPE_BEING_DEFINED (current_class_type
)
6484 && !CLASSTYPE_TEMPLATE_INSTANTIATION (current_class_type
)
6485 && (DECL_INITIAL (decl
) || init
))
6486 DECL_INITIALIZED_IN_CLASS_P (decl
) = 1;
6488 if (TREE_CODE (decl
) != FUNCTION_DECL
6489 && (auto_node
= type_uses_auto (type
)))
6492 if (init
== NULL_TREE
)
6494 if (DECL_LANG_SPECIFIC (decl
)
6495 && DECL_TEMPLATE_INSTANTIATION (decl
)
6496 && !DECL_TEMPLATE_INSTANTIATED (decl
))
6498 /* init is null because we're deferring instantiating the
6499 initializer until we need it. Well, we need it now. */
6500 instantiate_decl (decl
, /*defer_ok*/true, /*expl*/false);
6504 error ("declaration of %q#D has no initializer", decl
);
6505 TREE_TYPE (decl
) = error_mark_node
;
6509 if (TREE_CODE (d_init
) == TREE_LIST
)
6510 d_init
= build_x_compound_expr_from_list (d_init
, ELK_INIT
,
6511 tf_warning_or_error
);
6512 d_init
= resolve_nondeduced_context (d_init
);
6513 type
= TREE_TYPE (decl
) = do_auto_deduction (type
, d_init
,
6515 tf_warning_or_error
,
6517 if (type
== error_mark_node
)
6519 cp_apply_type_quals_to_decl (cp_type_quals (type
), decl
);
6522 if (!ensure_literal_type_for_constexpr_object (decl
))
6523 DECL_DECLARED_CONSTEXPR_P (decl
) = 0;
6526 && DECL_CLASS_SCOPE_P (decl
)
6527 && DECL_INITIALIZED_IN_CLASS_P (decl
))
6528 check_static_variable_definition (decl
, type
);
6530 if (init
&& TREE_CODE (decl
) == FUNCTION_DECL
)
6533 if (init
== ridpointers
[(int)RID_DELETE
])
6535 /* FIXME check this is 1st decl. */
6536 DECL_DELETED_FN (decl
) = 1;
6537 DECL_DECLARED_INLINE_P (decl
) = 1;
6538 DECL_INITIAL (decl
) = error_mark_node
;
6539 FOR_EACH_CLONE (clone
, decl
)
6541 DECL_DELETED_FN (clone
) = 1;
6542 DECL_DECLARED_INLINE_P (clone
) = 1;
6543 DECL_INITIAL (clone
) = error_mark_node
;
6547 else if (init
== ridpointers
[(int)RID_DEFAULT
])
6549 if (defaultable_fn_check (decl
))
6550 DECL_DEFAULTED_FN (decl
) = 1;
6552 DECL_INITIAL (decl
) = NULL_TREE
;
6556 if (init
&& VAR_P (decl
))
6558 DECL_NONTRIVIALLY_INITIALIZED_P (decl
) = 1;
6559 /* If DECL is a reference, then we want to know whether init is a
6560 reference constant; init_const_expr_p as passed tells us whether
6561 it's an rvalue constant. */
6562 if (TREE_CODE (type
) == REFERENCE_TYPE
)
6563 init_const_expr_p
= potential_constant_expression (init
);
6564 if (init_const_expr_p
)
6566 /* Set these flags now for templates. We'll update the flags in
6567 store_init_value for instantiations. */
6568 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl
) = 1;
6569 if (decl_maybe_constant_var_p (decl
))
6570 TREE_CONSTANT (decl
) = 1;
6574 if (processing_template_decl
)
6576 bool type_dependent_p
;
6578 /* Add this declaration to the statement-tree. */
6579 if (at_function_scope_p ())
6580 add_decl_expr (decl
);
6582 type_dependent_p
= dependent_type_p (type
);
6584 if (check_for_bare_parameter_packs (init
))
6587 DECL_INITIAL (decl
) = NULL_TREE
;
6590 /* Generally, initializers in templates are expanded when the
6591 template is instantiated. But, if DECL is a variable constant
6592 then it can be used in future constant expressions, so its value
6593 must be available. */
6595 if (!VAR_P (decl
) || type_dependent_p
)
6596 /* We can't do anything if the decl has dependent type. */;
6598 && init_const_expr_p
6599 && TREE_CODE (type
) != REFERENCE_TYPE
6600 && decl_maybe_constant_var_p (decl
)
6601 && !type_dependent_init_p (init
)
6602 && !value_dependent_init_p (init
))
6604 /* This variable seems to be a non-dependent constant, so process
6605 its initializer. If check_initializer returns non-null the
6606 initialization wasn't constant after all. */
6608 cleanups
= make_tree_vector ();
6609 init_code
= check_initializer (decl
, init
, flags
, &cleanups
);
6610 if (init_code
== NULL_TREE
)
6612 release_tree_vector (cleanups
);
6614 else if (!init
&& is_concept_var (decl
))
6615 error ("variable concept has no initializer");
6616 else if (!DECL_PRETTY_FUNCTION_P (decl
))
6618 /* Deduce array size even if the initializer is dependent. */
6619 maybe_deduce_size_from_array_init (decl
, init
);
6620 /* And complain about multiple initializers. */
6621 if (init
&& TREE_CODE (init
) == TREE_LIST
&& TREE_CHAIN (init
)
6622 && !MAYBE_CLASS_TYPE_P (type
))
6623 init
= build_x_compound_expr_from_list (init
, ELK_INIT
,
6624 tf_warning_or_error
);
6628 DECL_INITIAL (decl
) = init
;
6632 /* Just store non-static data member initializers for later. */
6633 if (init
&& TREE_CODE (decl
) == FIELD_DECL
)
6634 DECL_INITIAL (decl
) = init
;
6636 /* Take care of TYPE_DECLs up front. */
6637 if (TREE_CODE (decl
) == TYPE_DECL
)
6639 if (type
!= error_mark_node
6640 && MAYBE_CLASS_TYPE_P (type
) && DECL_NAME (decl
))
6642 if (TREE_TYPE (DECL_NAME (decl
)) && TREE_TYPE (decl
) != type
)
6643 warning (0, "shadowing previous type declaration of %q#D", decl
);
6644 set_identifier_type_value (DECL_NAME (decl
), decl
);
6647 /* If we have installed this as the canonical typedef for this
6648 type, and that type has not been defined yet, delay emitting
6649 the debug information for it, as we will emit it later. */
6650 if (TYPE_MAIN_DECL (TREE_TYPE (decl
)) == decl
6651 && !COMPLETE_TYPE_P (TREE_TYPE (decl
)))
6652 TYPE_DECL_SUPPRESS_DEBUG (decl
) = 1;
6654 rest_of_decl_compilation (decl
, DECL_FILE_SCOPE_P (decl
),
6659 /* A reference will be modified here, as it is initialized. */
6660 if (! DECL_EXTERNAL (decl
)
6661 && TREE_READONLY (decl
)
6662 && TREE_CODE (type
) == REFERENCE_TYPE
)
6665 TREE_READONLY (decl
) = 0;
6670 /* If this is a local variable that will need a mangled name,
6671 register it now. We must do this before processing the
6672 initializer for the variable, since the initialization might
6673 require a guard variable, and since the mangled name of the
6674 guard variable will depend on the mangled name of this
6676 if (DECL_FUNCTION_SCOPE_P (decl
)
6677 && TREE_STATIC (decl
)
6678 && !DECL_ARTIFICIAL (decl
))
6680 push_local_name (decl
);
6681 if (DECL_CONSTRUCTOR_P (current_function_decl
)
6682 || DECL_DESTRUCTOR_P (current_function_decl
))
6683 /* Normally local_decls is populated during GIMPLE lowering,
6684 but [cd]tors are never actually compiled directly. We need
6685 to put statics on the list so we can deal with the label
6686 address extension. FIXME. */
6687 add_local_decl (cfun
, decl
);
6690 /* Convert the initializer to the type of DECL, if we have not
6691 already initialized DECL. */
6692 if (!DECL_INITIALIZED_P (decl
)
6693 /* If !DECL_EXTERNAL then DECL is being defined. In the
6694 case of a static data member initialized inside the
6695 class-specifier, there can be an initializer even if DECL
6696 is *not* defined. */
6697 && (!DECL_EXTERNAL (decl
) || init
))
6699 if (TYPE_FOR_JAVA (type
) && MAYBE_CLASS_TYPE_P (type
))
6702 = IDENTIFIER_GLOBAL_VALUE (get_identifier ("jclass"));
6703 /* Allow libjava/prims.cc define primitive classes. */
6704 if (init
!= NULL_TREE
6705 || jclass
== NULL_TREE
6706 || TREE_CODE (jclass
) != TYPE_DECL
6707 || !POINTER_TYPE_P (TREE_TYPE (jclass
))
6708 || !same_type_ignoring_top_level_qualifiers_p
6709 (type
, TREE_TYPE (TREE_TYPE (jclass
))))
6710 error ("Java object %qD not allocated with %<new%>", decl
);
6713 cleanups
= make_tree_vector ();
6714 init
= check_initializer (decl
, init
, flags
, &cleanups
);
6720 The memory occupied by any object of static storage
6721 duration is zero-initialized at program startup before
6722 any other initialization takes place.
6724 We cannot create an appropriate initializer until after
6725 the type of DECL is finalized. If DECL_INITIAL is set,
6726 then the DECL is statically initialized, and any
6727 necessary zero-initialization has already been performed. */
6728 if (TREE_STATIC (decl
) && !DECL_INITIAL (decl
))
6729 DECL_INITIAL (decl
) = build_zero_init (TREE_TYPE (decl
),
6730 /*nelts=*/NULL_TREE
,
6731 /*static_storage_p=*/true);
6732 /* Remember that the initialization for this variable has
6734 DECL_INITIALIZED_P (decl
) = 1;
6735 /* This declaration is the definition of this variable,
6736 unless we are initializing a static data member within
6737 the class specifier. */
6738 if (!DECL_EXTERNAL (decl
))
6739 var_definition_p
= true;
6741 /* If the variable has an array type, lay out the type, even if
6742 there is no initializer. It is valid to index through the
6743 array, and we must get TYPE_ALIGN set correctly on the array
6745 else if (TREE_CODE (type
) == ARRAY_TYPE
)
6748 if (TREE_STATIC (decl
)
6749 && !at_function_scope_p ()
6750 && current_function_decl
== NULL
)
6751 /* So decl is a global variable or a static member of a
6752 non local class. Record the types it uses
6753 so that we can decide later to emit debug info for them. */
6754 record_types_used_by_current_var_decl (decl
);
6756 else if (TREE_CODE (decl
) == FIELD_DECL
6757 && TYPE_FOR_JAVA (type
) && MAYBE_CLASS_TYPE_P (type
))
6758 error ("non-static data member %qD has Java class type", decl
);
6760 /* Add this declaration to the statement-tree. This needs to happen
6761 after the call to check_initializer so that the DECL_EXPR for a
6762 reference temp is added before the DECL_EXPR for the reference itself. */
6763 if (DECL_FUNCTION_SCOPE_P (decl
))
6765 /* If we're building a variable sized type, and we might be
6766 reachable other than via the top of the current binding
6767 level, then create a new BIND_EXPR so that we deallocate
6768 the object at the right time. */
6771 && !TREE_CONSTANT (DECL_SIZE (decl
))
6772 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list
))
6775 bind
= build3 (BIND_EXPR
, void_type_node
, NULL
, NULL
, NULL
);
6776 TREE_SIDE_EFFECTS (bind
) = 1;
6778 BIND_EXPR_BODY (bind
) = push_stmt_list ();
6780 add_decl_expr (decl
);
6783 /* Let the middle end know about variables and functions -- but not
6784 static data members in uninstantiated class templates. */
6785 if (VAR_OR_FUNCTION_DECL_P (decl
))
6789 layout_var_decl (decl
);
6790 maybe_commonize_var (decl
);
6793 /* This needs to happen after the linkage is set. */
6794 determine_visibility (decl
);
6796 if (var_definition_p
&& TREE_STATIC (decl
))
6798 /* If a TREE_READONLY variable needs initialization
6799 at runtime, it is no longer readonly and we need to
6800 avoid MEM_READONLY_P being set on RTL created for it. */
6803 if (TREE_READONLY (decl
))
6804 TREE_READONLY (decl
) = 0;
6807 else if (was_readonly
)
6808 TREE_READONLY (decl
) = 1;
6810 /* Likewise if it needs destruction. */
6811 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type
))
6812 TREE_READONLY (decl
) = 0;
6815 make_rtl_for_nonlocal_decl (decl
, init
, asmspec
);
6817 /* Check for abstractness of the type. Notice that there is no
6818 need to strip array types here since the check for those types
6819 is already done within create_array_type_for_decl. */
6820 abstract_virtuals_error (decl
, type
);
6822 if (TREE_TYPE (decl
) == error_mark_node
)
6823 /* No initialization required. */
6825 else if (TREE_CODE (decl
) == FUNCTION_DECL
)
6829 if (init
== ridpointers
[(int)RID_DEFAULT
])
6831 /* An out-of-class default definition is defined at
6832 the point where it is explicitly defaulted. */
6833 if (DECL_DELETED_FN (decl
))
6834 maybe_explain_implicit_delete (decl
);
6835 else if (DECL_INITIAL (decl
) == error_mark_node
)
6836 synthesize_method (decl
);
6839 error ("function %q#D is initialized like a variable", decl
);
6841 /* else no initialization required. */
6843 else if (DECL_EXTERNAL (decl
)
6844 && ! (DECL_LANG_SPECIFIC (decl
)
6845 && DECL_NOT_REALLY_EXTERN (decl
)))
6848 DECL_INITIAL (decl
) = init
;
6850 /* A variable definition. */
6851 else if (DECL_FUNCTION_SCOPE_P (decl
) && !TREE_STATIC (decl
))
6852 /* Initialize the local variable. */
6853 initialize_local_var (decl
, init
);
6855 /* If a variable is defined, and then a subsequent
6856 definition with external linkage is encountered, we will
6857 get here twice for the same variable. We want to avoid
6858 calling expand_static_init more than once. For variables
6859 that are not static data members, we can call
6860 expand_static_init only when we actually process the
6861 initializer. It is not legal to redeclare a static data
6862 member, so this issue does not arise in that case. */
6863 else if (var_definition_p
&& TREE_STATIC (decl
))
6864 expand_static_init (decl
, init
);
6867 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
6868 reference, insert it in the statement-tree now. */
6872 FOR_EACH_VEC_ELT (*cleanups
, i
, t
)
6873 push_cleanup (decl
, t
, false);
6874 release_tree_vector (cleanups
);
6878 TREE_READONLY (decl
) = 1;
6880 invoke_plugin_callbacks (PLUGIN_FINISH_DECL
, decl
);
6883 /* Returns a declaration for a VAR_DECL as if:
6885 extern "C" TYPE NAME;
6887 had been seen. Used to create compiler-generated global
6891 declare_global_var (tree name
, tree type
)
6895 push_to_top_level ();
6896 decl
= build_decl (input_location
, VAR_DECL
, name
, type
);
6897 TREE_PUBLIC (decl
) = 1;
6898 DECL_EXTERNAL (decl
) = 1;
6899 DECL_ARTIFICIAL (decl
) = 1;
6900 /* If the user has explicitly declared this variable (perhaps
6901 because the code we are compiling is part of a low-level runtime
6902 library), then it is possible that our declaration will be merged
6903 with theirs by pushdecl. */
6904 decl
= pushdecl (decl
);
6905 cp_finish_decl (decl
, NULL_TREE
, false, NULL_TREE
, 0);
6906 pop_from_top_level ();
6911 /* Returns the type for the argument to "__cxa_atexit" (or "atexit",
6912 if "__cxa_atexit" is not being used) corresponding to the function
6913 to be called when the program exits. */
6916 get_atexit_fn_ptr_type (void)
6920 if (!atexit_fn_ptr_type_node
)
6923 if (flag_use_cxa_atexit
6924 && !targetm
.cxx
.use_atexit_for_cxa_atexit ())
6925 /* The parameter to "__cxa_atexit" is "void (*)(void *)". */
6926 arg_type
= ptr_type_node
;
6928 /* The parameter to "atexit" is "void (*)(void)". */
6929 arg_type
= NULL_TREE
;
6931 fn_type
= build_function_type_list (void_type_node
,
6932 arg_type
, NULL_TREE
);
6933 atexit_fn_ptr_type_node
= build_pointer_type (fn_type
);
6936 return atexit_fn_ptr_type_node
;
6939 /* Returns a pointer to the `atexit' function. Note that if
6940 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
6941 `__cxa_atexit' function specified in the IA64 C++ ABI. */
6944 get_atexit_node (void)
6950 bool use_aeabi_atexit
;
6955 if (flag_use_cxa_atexit
&& !targetm
.cxx
.use_atexit_for_cxa_atexit ())
6957 /* The declaration for `__cxa_atexit' is:
6959 int __cxa_atexit (void (*)(void *), void *, void *)
6961 We build up the argument types and then the function type
6963 tree argtype0
, argtype1
, argtype2
;
6965 use_aeabi_atexit
= targetm
.cxx
.use_aeabi_atexit ();
6966 /* First, build the pointer-to-function type for the first
6968 fn_ptr_type
= get_atexit_fn_ptr_type ();
6969 /* Then, build the rest of the argument types. */
6970 argtype2
= ptr_type_node
;
6971 if (use_aeabi_atexit
)
6973 argtype1
= fn_ptr_type
;
6974 argtype0
= ptr_type_node
;
6978 argtype1
= ptr_type_node
;
6979 argtype0
= fn_ptr_type
;
6981 /* And the final __cxa_atexit type. */
6982 fn_type
= build_function_type_list (integer_type_node
,
6983 argtype0
, argtype1
, argtype2
,
6985 if (use_aeabi_atexit
)
6986 name
= "__aeabi_atexit";
6988 name
= "__cxa_atexit";
6992 /* The declaration for `atexit' is:
6994 int atexit (void (*)());
6996 We build up the argument types and then the function type
6998 fn_ptr_type
= get_atexit_fn_ptr_type ();
6999 /* Build the final atexit type. */
7000 fn_type
= build_function_type_list (integer_type_node
,
7001 fn_ptr_type
, NULL_TREE
);
7005 /* Now, build the function declaration. */
7006 push_lang_context (lang_name_c
);
7007 atexit_fndecl
= build_library_fn_ptr (name
, fn_type
, ECF_LEAF
| ECF_NOTHROW
);
7008 mark_used (atexit_fndecl
);
7009 pop_lang_context ();
7010 atexit_node
= decay_conversion (atexit_fndecl
, tf_warning_or_error
);
7015 /* Like get_atexit_node, but for thread-local cleanups. */
7018 get_thread_atexit_node (void)
7020 /* The declaration for `__cxa_thread_atexit' is:
7022 int __cxa_thread_atexit (void (*)(void *), void *, void *) */
7023 tree fn_type
= build_function_type_list (integer_type_node
,
7024 get_atexit_fn_ptr_type (),
7025 ptr_type_node
, ptr_type_node
,
7028 /* Now, build the function declaration. */
7029 tree atexit_fndecl
= build_library_fn_ptr ("__cxa_thread_atexit", fn_type
,
7030 ECF_LEAF
| ECF_NOTHROW
);
7031 return decay_conversion (atexit_fndecl
, tf_warning_or_error
);
7034 /* Returns the __dso_handle VAR_DECL. */
7037 get_dso_handle_node (void)
7039 if (dso_handle_node
)
7040 return dso_handle_node
;
7042 /* Declare the variable. */
7043 dso_handle_node
= declare_global_var (get_identifier ("__dso_handle"),
7046 #ifdef HAVE_GAS_HIDDEN
7047 if (dso_handle_node
!= error_mark_node
)
7049 DECL_VISIBILITY (dso_handle_node
) = VISIBILITY_HIDDEN
;
7050 DECL_VISIBILITY_SPECIFIED (dso_handle_node
) = 1;
7054 return dso_handle_node
;
7057 /* Begin a new function with internal linkage whose job will be simply
7058 to destroy some particular variable. */
7060 static GTY(()) int start_cleanup_cnt
;
7063 start_cleanup_fn (void)
7068 bool use_cxa_atexit
= flag_use_cxa_atexit
7069 && !targetm
.cxx
.use_atexit_for_cxa_atexit ();
7071 push_to_top_level ();
7073 /* No need to mangle this. */
7074 push_lang_context (lang_name_c
);
7076 /* Build the name of the function. */
7077 sprintf (name
, "__tcf_%d", start_cleanup_cnt
++);
7078 /* Build the function declaration. */
7079 fntype
= TREE_TYPE (get_atexit_fn_ptr_type ());
7080 fndecl
= build_lang_decl (FUNCTION_DECL
, get_identifier (name
), fntype
);
7081 /* It's a function with internal linkage, generated by the
7083 TREE_PUBLIC (fndecl
) = 0;
7084 DECL_ARTIFICIAL (fndecl
) = 1;
7085 /* Make the function `inline' so that it is only emitted if it is
7086 actually needed. It is unlikely that it will be inlined, since
7087 it is only called via a function pointer, but we avoid unnecessary
7088 emissions this way. */
7089 DECL_DECLARED_INLINE_P (fndecl
) = 1;
7090 DECL_INTERFACE_KNOWN (fndecl
) = 1;
7091 /* Build the parameter. */
7096 parmdecl
= cp_build_parm_decl (NULL_TREE
, ptr_type_node
);
7097 DECL_CONTEXT (parmdecl
) = fndecl
;
7098 TREE_USED (parmdecl
) = 1;
7099 DECL_READ_P (parmdecl
) = 1;
7100 DECL_ARGUMENTS (fndecl
) = parmdecl
;
7104 start_preparsed_function (fndecl
, NULL_TREE
, SF_PRE_PARSED
);
7106 pop_lang_context ();
7108 return current_function_decl
;
7111 /* Finish the cleanup function begun by start_cleanup_fn. */
7114 end_cleanup_fn (void)
7116 expand_or_defer_fn (finish_function (0));
7118 pop_from_top_level ();
7121 /* Generate code to handle the destruction of DECL, an object with
7122 static storage duration. */
7125 register_dtor_fn (tree decl
)
7132 bool ob_parm
, dso_parm
, use_dtor
;
7133 tree arg0
, arg1
, arg2
;
7136 type
= TREE_TYPE (decl
);
7137 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type
))
7140 /* If we're using "__cxa_atexit" (or "__cxa_thread_atexit" or
7141 "__aeabi_atexit"), and DECL is a class object, we can just pass the
7142 destructor to "__cxa_atexit"; we don't have to build a temporary
7143 function to do the cleanup. */
7144 dso_parm
= (flag_use_cxa_atexit
7145 && !targetm
.cxx
.use_atexit_for_cxa_atexit ());
7146 ob_parm
= (CP_DECL_THREAD_LOCAL_P (decl
) || dso_parm
);
7147 use_dtor
= ob_parm
&& CLASS_TYPE_P (type
);
7152 /* Find the destructor. */
7153 idx
= lookup_fnfields_1 (type
, complete_dtor_identifier
);
7154 gcc_assert (idx
>= 0);
7155 cleanup
= (*CLASSTYPE_METHOD_VEC (type
))[idx
];
7156 /* Make sure it is accessible. */
7157 perform_or_defer_access_check (TYPE_BINFO (type
), cleanup
, cleanup
,
7158 tf_warning_or_error
);
7162 /* Call build_cleanup before we enter the anonymous function so
7163 that any access checks will be done relative to the current
7164 scope, rather than the scope of the anonymous function. */
7165 build_cleanup (decl
);
7167 /* Now start the function. */
7168 cleanup
= start_cleanup_fn ();
7170 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
7171 to the original function, rather than the anonymous one. That
7172 will make the back end think that nested functions are in use,
7173 which causes confusion. */
7174 push_deferring_access_checks (dk_no_check
);
7175 fcall
= build_cleanup (decl
);
7176 pop_deferring_access_checks ();
7178 /* Create the body of the anonymous function. */
7179 compound_stmt
= begin_compound_stmt (BCS_FN_BODY
);
7180 finish_expr_stmt (fcall
);
7181 finish_compound_stmt (compound_stmt
);
7185 /* Call atexit with the cleanup function. */
7186 mark_used (cleanup
);
7187 cleanup
= build_address (cleanup
);
7189 if (CP_DECL_THREAD_LOCAL_P (decl
))
7190 atex_node
= get_thread_atexit_node ();
7192 atex_node
= get_atexit_node ();
7196 /* We must convert CLEANUP to the type that "__cxa_atexit"
7198 cleanup
= build_nop (get_atexit_fn_ptr_type (), cleanup
);
7199 /* "__cxa_atexit" will pass the address of DECL to the
7200 cleanup function. */
7202 addr
= build_address (decl
);
7203 /* The declared type of the parameter to "__cxa_atexit" is
7204 "void *". For plain "T*", we could just let the
7205 machinery in cp_build_function_call convert it -- but if the
7206 type is "cv-qualified T *", then we need to convert it
7207 before passing it in, to avoid spurious errors. */
7208 addr
= build_nop (ptr_type_node
, addr
);
7211 /* Since the cleanup functions we build ignore the address
7212 they're given, there's no reason to pass the actual address
7213 in, and, in general, it's cheaper to pass NULL than any
7215 addr
= null_pointer_node
;
7218 arg2
= cp_build_addr_expr (get_dso_handle_node (),
7219 tf_warning_or_error
);
7221 /* Just pass NULL to the dso handle parm if we don't actually
7222 have a DSO handle on this target. */
7223 arg2
= null_pointer_node
;
7229 if (!CP_DECL_THREAD_LOCAL_P (decl
)
7230 && targetm
.cxx
.use_aeabi_atexit ())
7246 return cp_build_function_call_nary (atex_node
, tf_warning_or_error
,
7247 arg0
, arg1
, arg2
, NULL_TREE
);
7250 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
7251 is its initializer. Generate code to handle the construction
7252 and destruction of DECL. */
7255 expand_static_init (tree decl
, tree init
)
7257 gcc_assert (VAR_P (decl
));
7258 gcc_assert (TREE_STATIC (decl
));
7260 /* Some variables require no dynamic initialization. */
7261 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl
)))
7263 /* Make sure the destructor is callable. */
7264 cxx_maybe_build_cleanup (decl
, tf_warning_or_error
);
7269 if (CP_DECL_THREAD_LOCAL_P (decl
) && DECL_GNU_TLS_P (decl
)
7270 && !DECL_FUNCTION_SCOPE_P (decl
))
7273 error ("non-local variable %qD declared %<__thread%> "
7274 "needs dynamic initialization", decl
);
7276 error ("non-local variable %qD declared %<__thread%> "
7277 "has a non-trivial destructor", decl
);
7278 static bool informed
;
7281 inform (DECL_SOURCE_LOCATION (decl
),
7282 "C++11 %<thread_local%> allows dynamic initialization "
7289 if (DECL_FUNCTION_SCOPE_P (decl
))
7291 /* Emit code to perform this initialization but once. */
7292 tree if_stmt
= NULL_TREE
, inner_if_stmt
= NULL_TREE
;
7293 tree then_clause
= NULL_TREE
, inner_then_clause
= NULL_TREE
;
7294 tree guard
, guard_addr
;
7296 /* We don't need thread-safety code for thread-local vars. */
7297 bool thread_guard
= (flag_threadsafe_statics
7298 && !CP_DECL_THREAD_LOCAL_P (decl
));
7300 /* Emit code to perform this initialization but once. This code
7303 static <type> guard;
7304 if (!__atomic_load (guard.first_byte)) {
7305 if (__cxa_guard_acquire (&guard)) {
7308 // Do initialization.
7309 flag = true; __cxa_guard_release (&guard);
7310 // Register variable for destruction at end of program.
7312 if (!flag) __cxa_guard_abort (&guard);
7316 Note that the `flag' variable is only set to 1 *after* the
7317 initialization is complete. This ensures that an exception,
7318 thrown during the construction, will cause the variable to
7319 reinitialized when we pass through this code again, as per:
7323 If the initialization exits by throwing an exception, the
7324 initialization is not complete, so it will be tried again
7325 the next time control enters the declaration.
7327 This process should be thread-safe, too; multiple threads
7328 should not be able to initialize the variable more than
7331 /* Create the guard variable. */
7332 guard
= get_guard (decl
);
7334 /* Begin the conditional initialization. */
7335 if_stmt
= begin_if_stmt ();
7337 finish_if_stmt_cond (get_guard_cond (guard
, thread_guard
), if_stmt
);
7338 then_clause
= begin_compound_stmt (BCS_NO_SCOPE
);
7342 tree vfntype
= NULL_TREE
;
7343 tree acquire_name
, release_name
, abort_name
;
7344 tree acquire_fn
, release_fn
, abort_fn
;
7345 guard_addr
= build_address (guard
);
7347 acquire_name
= get_identifier ("__cxa_guard_acquire");
7348 release_name
= get_identifier ("__cxa_guard_release");
7349 abort_name
= get_identifier ("__cxa_guard_abort");
7350 acquire_fn
= identifier_global_value (acquire_name
);
7351 release_fn
= identifier_global_value (release_name
);
7352 abort_fn
= identifier_global_value (abort_name
);
7354 acquire_fn
= push_library_fn
7355 (acquire_name
, build_function_type_list (integer_type_node
,
7356 TREE_TYPE (guard_addr
),
7358 NULL_TREE
, ECF_NOTHROW
| ECF_LEAF
);
7359 if (!release_fn
|| !abort_fn
)
7360 vfntype
= build_function_type_list (void_type_node
,
7361 TREE_TYPE (guard_addr
),
7364 release_fn
= push_library_fn (release_name
, vfntype
, NULL_TREE
,
7365 ECF_NOTHROW
| ECF_LEAF
);
7367 abort_fn
= push_library_fn (abort_name
, vfntype
, NULL_TREE
,
7368 ECF_NOTHROW
| ECF_LEAF
);
7370 inner_if_stmt
= begin_if_stmt ();
7371 finish_if_stmt_cond (build_call_n (acquire_fn
, 1, guard_addr
),
7374 inner_then_clause
= begin_compound_stmt (BCS_NO_SCOPE
);
7375 begin
= get_target_expr (boolean_false_node
);
7376 flag
= TARGET_EXPR_SLOT (begin
);
7378 TARGET_EXPR_CLEANUP (begin
)
7379 = build3 (COND_EXPR
, void_type_node
, flag
,
7381 build_call_n (abort_fn
, 1, guard_addr
));
7382 CLEANUP_EH_ONLY (begin
) = 1;
7384 /* Do the initialization itself. */
7385 init
= add_stmt_to_compound (begin
, init
);
7386 init
= add_stmt_to_compound
7387 (init
, build2 (MODIFY_EXPR
, void_type_node
, flag
, boolean_true_node
));
7388 init
= add_stmt_to_compound
7389 (init
, build_call_n (release_fn
, 1, guard_addr
));
7392 init
= add_stmt_to_compound (init
, set_guard (guard
));
7394 /* Use atexit to register a function for destroying this static
7396 init
= add_stmt_to_compound (init
, register_dtor_fn (decl
));
7398 finish_expr_stmt (init
);
7402 finish_compound_stmt (inner_then_clause
);
7403 finish_then_clause (inner_if_stmt
);
7404 finish_if_stmt (inner_if_stmt
);
7407 finish_compound_stmt (then_clause
);
7408 finish_then_clause (if_stmt
);
7409 finish_if_stmt (if_stmt
);
7411 else if (CP_DECL_THREAD_LOCAL_P (decl
))
7412 tls_aggregates
= tree_cons (init
, decl
, tls_aggregates
);
7414 static_aggregates
= tree_cons (init
, decl
, static_aggregates
);
7418 /* Make TYPE a complete type based on INITIAL_VALUE.
7419 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
7420 2 if there was no information (in which case assume 0 if DO_DEFAULT),
7421 3 if the initializer list is empty (in pedantic mode). */
7424 cp_complete_array_type (tree
*ptype
, tree initial_value
, bool do_default
)
7427 tree type
, elt_type
;
7429 /* Don't get confused by a CONSTRUCTOR for some other type. */
7430 if (initial_value
&& TREE_CODE (initial_value
) == CONSTRUCTOR
7431 && !BRACE_ENCLOSED_INITIALIZER_P (initial_value
))
7436 unsigned HOST_WIDE_INT i
;
7439 /* An array of character type can be initialized from a
7440 brace-enclosed string constant.
7442 FIXME: this code is duplicated from reshape_init. Probably
7443 we should just call reshape_init here? */
7444 if (char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (*ptype
)))
7445 && TREE_CODE (initial_value
) == CONSTRUCTOR
7446 && !vec_safe_is_empty (CONSTRUCTOR_ELTS (initial_value
)))
7448 vec
<constructor_elt
, va_gc
> *v
= CONSTRUCTOR_ELTS (initial_value
);
7449 tree value
= (*v
)[0].value
;
7451 if (TREE_CODE (value
) == STRING_CST
7452 && v
->length () == 1)
7453 initial_value
= value
;
7456 /* If any of the elements are parameter packs, we can't actually
7457 complete this type now because the array size is dependent. */
7458 if (TREE_CODE (initial_value
) == CONSTRUCTOR
)
7460 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (initial_value
),
7463 if (PACK_EXPANSION_P (value
))
7469 failure
= complete_array_type (ptype
, initial_value
, do_default
);
7471 /* We can create the array before the element type is complete, which
7472 means that we didn't have these two bits set in the original type
7473 either. In completing the type, we are expected to propagate these
7474 bits. See also complete_type which does the same thing for arrays
7477 if (TYPE_DOMAIN (type
))
7479 elt_type
= TREE_TYPE (type
);
7480 TYPE_NEEDS_CONSTRUCTING (type
) = TYPE_NEEDS_CONSTRUCTING (elt_type
);
7481 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type
)
7482 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (elt_type
);
7488 /* As above, but either give an error or reject zero-size arrays, depending
7492 cp_complete_array_type_or_error (tree
*ptype
, tree initial_value
,
7493 bool do_default
, tsubst_flags_t complain
)
7496 bool sfinae
= !(complain
& tf_error
);
7497 /* In SFINAE context we can't be lenient about zero-size arrays. */
7500 failure
= cp_complete_array_type (ptype
, initial_value
, do_default
);
7506 /* Not an error. */;
7507 else if (failure
== 1)
7508 error ("initializer fails to determine size of %qT", *ptype
);
7509 else if (failure
== 2)
7512 error ("array size missing in %qT", *ptype
);
7514 else if (failure
== 3)
7515 error ("zero-size array %qT", *ptype
);
7516 *ptype
= error_mark_node
;
7521 /* Return zero if something is declared to be a member of type
7522 CTYPE when in the context of CUR_TYPE. STRING is the error
7523 message to print in that case. Otherwise, quietly return 1. */
7526 member_function_or_else (tree ctype
, tree cur_type
, enum overload_flags flags
)
7528 if (ctype
&& ctype
!= cur_type
)
7530 if (flags
== DTOR_FLAG
)
7531 error ("destructor for alien class %qT cannot be a member", ctype
);
7533 error ("constructor for alien class %qT cannot be a member", ctype
);
7539 /* Subroutine of `grokdeclarator'. */
7541 /* Generate errors possibly applicable for a given set of specifiers.
7542 This is for ARM $7.1.2. */
7545 bad_specifiers (tree object
,
7546 enum bad_spec_place type
,
7557 error ("%qD declared as a %<virtual%> variable", object
);
7559 error ("%qD declared as an %<inline%> variable", object
);
7561 error ("%<const%> and %<volatile%> function specifiers on "
7562 "%qD invalid in variable declaration", object
);
7566 error ("%qD declared as a %<virtual%> parameter", object
);
7568 error ("%qD declared as an %<inline%> parameter", object
);
7570 error ("%<const%> and %<volatile%> function specifiers on "
7571 "%qD invalid in parameter declaration", object
);
7575 error ("%qD declared as a %<virtual%> type", object
);
7577 error ("%qD declared as an %<inline%> type", object
);
7579 error ("%<const%> and %<volatile%> function specifiers on "
7580 "%qD invalid in type declaration", object
);
7584 error ("%qD declared as a %<virtual%> field", object
);
7586 error ("%qD declared as an %<inline%> field", object
);
7588 error ("%<const%> and %<volatile%> function specifiers on "
7589 "%qD invalid in field declaration", object
);
7595 error ("%q+D declared as a friend", object
);
7597 && (TREE_CODE (object
) == TYPE_DECL
7598 || (!TYPE_PTRFN_P (TREE_TYPE (object
))
7599 && !TYPE_REFFN_P (TREE_TYPE (object
))
7600 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (object
)))))
7601 error ("%q+D declared with an exception specification", object
);
7604 /* DECL is a member function or static data member and is presently
7605 being defined. Check that the definition is taking place in a
7609 check_class_member_definition_namespace (tree decl
)
7611 /* These checks only apply to member functions and static data
7613 gcc_assert (VAR_OR_FUNCTION_DECL_P (decl
));
7614 /* We check for problems with specializations in pt.c in
7615 check_specialization_namespace, where we can issue better
7617 if (processing_specialization
)
7619 /* There are no restrictions on the placement of
7620 explicit instantiations. */
7621 if (processing_explicit_instantiation
)
7625 A member function definition that appears outside of the
7626 class definition shall appear in a namespace scope enclosing
7627 the class definition.
7631 The definition for a static data member shall appear in a
7632 namespace scope enclosing the member's class definition. */
7633 if (!is_ancestor (current_namespace
, DECL_CONTEXT (decl
)))
7634 permerror (input_location
, "definition of %qD is not in namespace enclosing %qT",
7635 decl
, DECL_CONTEXT (decl
));
7638 /* Build a PARM_DECL for the "this" parameter. TYPE is the
7639 METHOD_TYPE for a non-static member function; QUALS are the
7640 cv-qualifiers that apply to the function. */
7643 build_this_parm (tree type
, cp_cv_quals quals
)
7648 cp_cv_quals this_quals
;
7650 if (CLASS_TYPE_P (type
))
7653 = cp_build_qualified_type (type
, quals
& ~TYPE_QUAL_RESTRICT
);
7654 this_type
= build_pointer_type (this_type
);
7657 this_type
= type_of_this_parm (type
);
7658 /* The `this' parameter is implicitly `const'; it cannot be
7660 this_quals
= (quals
& TYPE_QUAL_RESTRICT
) | TYPE_QUAL_CONST
;
7661 qual_type
= cp_build_qualified_type (this_type
, this_quals
);
7662 parm
= build_artificial_parm (this_identifier
, qual_type
);
7663 cp_apply_type_quals_to_decl (this_quals
, parm
);
7667 /* DECL is a static member function. Complain if it was declared
7668 with function-cv-quals. */
7671 check_static_quals (tree decl
, cp_cv_quals quals
)
7673 if (quals
!= TYPE_UNQUALIFIED
)
7674 error ("static member function %q#D declared with type qualifiers",
7678 // Check that FN takes no arguments and returns bool.
7680 check_concept_fn (tree fn
)
7682 // A constraint is nullary.
7683 if (DECL_ARGUMENTS (fn
))
7684 error ("concept %q#D declared with function parameters", fn
);
7686 // The declared return type of the concept shall be bool, and
7687 // it shall not be deduced from it definition.
7688 tree type
= TREE_TYPE (TREE_TYPE (fn
));
7690 error ("concept %q#D declared with a deduced return type", fn
);
7691 else if (type
!= boolean_type_node
)
7692 error ("concept %q#D with non-%<bool%> return type %qT", fn
, type
);
7695 /* Helper function. Replace the temporary this parameter injected
7696 during cp_finish_omp_declare_simd with the real this parameter. */
7699 declare_simd_adjust_this (tree
*tp
, int *walk_subtrees
, void *data
)
7701 tree this_parm
= (tree
) data
;
7702 if (TREE_CODE (*tp
) == PARM_DECL
7703 && DECL_NAME (*tp
) == this_identifier
7704 && *tp
!= this_parm
)
7706 else if (TYPE_P (*tp
))
7711 /* CTYPE is class type, or null if non-class.
7712 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
7714 DECLARATOR is the function's name.
7715 PARMS is a chain of PARM_DECLs for the function.
7716 VIRTUALP is truthvalue of whether the function is virtual or not.
7717 FLAGS are to be passed through to `grokclassfn'.
7718 QUALS are qualifiers indicating whether the function is `const'
7720 RAISES is a list of exceptions that this function can raise.
7721 CHECK is 1 if we must find this method in CTYPE, 0 if we should
7722 not look, and -1 if we should not call `grokclassfn' at all.
7724 SFK is the kind of special function (if any) for the new function.
7726 Returns `NULL_TREE' if something goes wrong, after issuing
7727 applicable error messages. */
7730 grokfndecl (tree ctype
,
7734 tree orig_declarator
,
7737 enum overload_flags flags
,
7739 cp_ref_qualifier rqual
,
7746 special_function_kind sfk
,
7751 location_t location
)
7754 int staticp
= ctype
&& TREE_CODE (type
) == FUNCTION_TYPE
;
7757 // Was the concept specifier present?
7758 bool concept_p
= inlinep
& 4;
7760 // Concept declarations must have a corresponding definition.
7761 if (concept_p
&& !funcdef_flag
)
7763 error ("concept %qD has no definition", declarator
);
7768 type
= build_ref_qualified_type (type
, rqual
);
7770 type
= build_exception_variant (type
, raises
);
7772 decl
= build_lang_decl (FUNCTION_DECL
, declarator
, type
);
7774 /* Set the constraints on the declaration. */
7777 tree tmpl_reqs
= NULL_TREE
;
7778 if (processing_template_decl
> template_class_depth (ctype
))
7779 tmpl_reqs
= TEMPLATE_PARMS_CONSTRAINTS (current_template_parms
);
7781 /* Adjust the required expression into a constraint. */
7783 decl_reqs
= make_predicate_constraint (decl_reqs
);
7785 tree ci
= build_constraints (tmpl_reqs
, decl_reqs
);
7786 set_constraints (decl
, ci
);
7789 /* If we have an explicit location, use it, otherwise use whatever
7790 build_lang_decl used (probably input_location). */
7791 if (location
!= UNKNOWN_LOCATION
)
7792 DECL_SOURCE_LOCATION (decl
) = location
;
7794 if (TREE_CODE (type
) == METHOD_TYPE
)
7797 parm
= build_this_parm (type
, quals
);
7798 DECL_CHAIN (parm
) = parms
;
7801 DECL_ARGUMENTS (decl
) = parms
;
7802 for (t
= parms
; t
; t
= DECL_CHAIN (t
))
7803 DECL_CONTEXT (t
) = decl
;
7804 /* Propagate volatile out from type to decl. */
7805 if (TYPE_VOLATILE (type
))
7806 TREE_THIS_VOLATILE (decl
) = 1;
7808 /* Setup decl according to sfk. */
7811 case sfk_constructor
:
7812 case sfk_copy_constructor
:
7813 case sfk_move_constructor
:
7814 DECL_CONSTRUCTOR_P (decl
) = 1;
7816 case sfk_destructor
:
7817 DECL_DESTRUCTOR_P (decl
) = 1;
7823 /* If pointers to member functions use the least significant bit to
7824 indicate whether a function is virtual, ensure a pointer
7825 to this function will have that bit clear. */
7826 if (TARGET_PTRMEMFUNC_VBIT_LOCATION
== ptrmemfunc_vbit_in_pfn
7827 && TREE_CODE (type
) == METHOD_TYPE
7828 && DECL_ALIGN (decl
) < 2 * BITS_PER_UNIT
)
7829 DECL_ALIGN (decl
) = 2 * BITS_PER_UNIT
;
7832 && TREE_CODE (orig_declarator
) == TEMPLATE_ID_EXPR
)
7836 ("defining explicit specialization %qD in friend declaration",
7840 tree fns
= TREE_OPERAND (orig_declarator
, 0);
7841 tree args
= TREE_OPERAND (orig_declarator
, 1);
7843 if (PROCESSING_REAL_TEMPLATE_DECL_P ())
7845 /* Something like `template <class T> friend void f<T>()'. */
7846 error ("invalid use of template-id %qD in declaration "
7847 "of primary template",
7853 /* A friend declaration of the form friend void f<>(). Record
7854 the information in the TEMPLATE_ID_EXPR. */
7855 SET_DECL_IMPLICIT_INSTANTIATION (decl
);
7857 gcc_assert (identifier_p (fns
) || TREE_CODE (fns
) == OVERLOAD
);
7858 DECL_TEMPLATE_INFO (decl
) = build_template_info (fns
, args
);
7860 for (t
= TYPE_ARG_TYPES (TREE_TYPE (decl
)); t
; t
= TREE_CHAIN (t
))
7861 if (TREE_PURPOSE (t
)
7862 && TREE_CODE (TREE_PURPOSE (t
)) == DEFAULT_ARG
)
7864 error ("default arguments are not allowed in declaration "
7865 "of friend template specialization %qD",
7872 error ("%<inline%> is not allowed in declaration of friend "
7873 "template specialization %qD",
7880 /* If this decl has namespace scope, set that up. */
7882 set_decl_namespace (decl
, in_namespace
, friendp
);
7884 DECL_CONTEXT (decl
) = FROB_CONTEXT (current_decl_namespace ());
7886 /* `main' and builtins have implicit 'C' linkage. */
7887 if ((MAIN_NAME_P (declarator
)
7888 || (IDENTIFIER_LENGTH (declarator
) > 10
7889 && IDENTIFIER_POINTER (declarator
)[0] == '_'
7890 && IDENTIFIER_POINTER (declarator
)[1] == '_'
7891 && strncmp (IDENTIFIER_POINTER (declarator
)+2, "builtin_", 8) == 0)
7892 || (targetcm
.cxx_implicit_extern_c
7893 && targetcm
.cxx_implicit_extern_c(IDENTIFIER_POINTER (declarator
))))
7894 && current_lang_name
== lang_name_cplusplus
7895 && ctype
== NULL_TREE
7896 && DECL_FILE_SCOPE_P (decl
))
7897 SET_DECL_LANGUAGE (decl
, lang_c
);
7899 /* Should probably propagate const out from type to decl I bet (mrs). */
7902 DECL_STATIC_FUNCTION_P (decl
) = 1;
7903 DECL_CONTEXT (decl
) = ctype
;
7907 DECL_DELETED_FN (decl
) = 1;
7911 DECL_CONTEXT (decl
) = ctype
;
7913 check_class_member_definition_namespace (decl
);
7916 if (ctype
== NULL_TREE
&& DECL_MAIN_P (decl
))
7918 if (PROCESSING_REAL_TEMPLATE_DECL_P())
7919 error ("cannot declare %<::main%> to be a template");
7921 error ("cannot declare %<::main%> to be inline");
7923 error ("cannot declare %<::main%> to be constexpr");
7925 error ("cannot declare %<::main%> to be static");
7930 /* Members of anonymous types and local classes have no linkage; make
7931 them internal. If a typedef is made later, this will be changed. */
7932 if (ctype
&& (!TREE_PUBLIC (TYPE_MAIN_DECL (ctype
))
7933 || decl_function_context (TYPE_MAIN_DECL (ctype
))))
7936 if (publicp
&& cxx_dialect
== cxx98
)
7938 /* [basic.link]: A name with no linkage (notably, the name of a class
7939 or enumeration declared in a local scope) shall not be used to
7940 declare an entity with linkage.
7942 DR 757 relaxes this restriction for C++0x. */
7943 no_linkage_error (decl
);
7946 TREE_PUBLIC (decl
) = publicp
;
7949 DECL_INTERFACE_KNOWN (decl
) = 1;
7950 DECL_NOT_REALLY_EXTERN (decl
) = 1;
7953 /* If the declaration was declared inline, mark it as such. */
7956 DECL_DECLARED_INLINE_P (decl
) = 1;
7958 DECL_COMDAT (decl
) = 1;
7961 DECL_DECLARED_CONSTEXPR_P (decl
) = true;
7963 // If the concept declaration specifier was found, check
7964 // that the declaration satisfies the necessary requirements.
7967 DECL_DECLARED_CONCEPT_P (decl
) = true;
7968 check_concept_fn (decl
);
7971 DECL_EXTERNAL (decl
) = 1;
7972 if (TREE_CODE (type
) == FUNCTION_TYPE
)
7977 ? G_("static member function %qD cannot have cv-qualifier")
7978 : G_("non-member function %qD cannot have cv-qualifier"),
7980 quals
= TYPE_UNQUALIFIED
;
7986 ? G_("static member function %qD cannot have ref-qualifier")
7987 : G_("non-member function %qD cannot have ref-qualifier"),
7989 rqual
= REF_QUAL_NONE
;
7993 if (IDENTIFIER_OPNAME_P (DECL_NAME (decl
))
7994 && !grok_op_properties (decl
, /*complain=*/true))
7996 else if (UDLIT_OPER_P (DECL_NAME (decl
)))
7998 bool long_long_unsigned_p
;
8000 const char *suffix
= NULL
;
8001 /* [over.literal]/6: Literal operators shall not have C linkage. */
8002 if (DECL_LANGUAGE (decl
) == lang_c
)
8004 error ("literal operator with C linkage");
8008 if (DECL_NAMESPACE_SCOPE_P (decl
))
8010 if (!check_literal_operator_args (decl
, &long_long_unsigned_p
,
8013 error ("%qD has invalid argument list", decl
);
8017 suffix
= UDLIT_OP_SUFFIX (DECL_NAME (decl
));
8018 if (long_long_unsigned_p
)
8020 if (cpp_interpret_int_suffix (parse_in
, suffix
, strlen (suffix
)))
8021 warning (0, "integer suffix %<%s%>"
8022 " shadowed by implementation", suffix
);
8024 else if (long_double_p
)
8026 if (cpp_interpret_float_suffix (parse_in
, suffix
, strlen (suffix
)))
8027 warning (0, "floating point suffix %<%s%>"
8028 " shadowed by implementation", suffix
);
8033 error ("%qD must be a non-member function", decl
);
8039 /* Make the init_value nonzero so pushdecl knows this is not
8040 tentative. error_mark_node is replaced later with the BLOCK. */
8041 DECL_INITIAL (decl
) = error_mark_node
;
8043 if (TYPE_NOTHROW_P (type
) || nothrow_libfn_p (decl
))
8044 TREE_NOTHROW (decl
) = 1;
8046 if (flag_openmp
|| flag_openmp_simd
|| flag_cilkplus
)
8048 /* Adjust "omp declare simd" attributes. */
8049 tree ods
= lookup_attribute ("omp declare simd", *attrlist
);
8053 for (attr
= ods
; attr
;
8054 attr
= lookup_attribute ("omp declare simd", TREE_CHAIN (attr
)))
8056 if (TREE_CODE (type
) == METHOD_TYPE
)
8057 walk_tree (&TREE_VALUE (attr
), declare_simd_adjust_this
,
8058 DECL_ARGUMENTS (decl
), NULL
);
8059 if (TREE_VALUE (attr
) != NULL_TREE
)
8061 tree cl
= TREE_VALUE (TREE_VALUE (attr
));
8062 cl
= c_omp_declare_simd_clauses_to_numbers
8063 (DECL_ARGUMENTS (decl
), cl
);
8065 TREE_VALUE (TREE_VALUE (attr
)) = cl
;
8067 TREE_VALUE (attr
) = NULL_TREE
;
8073 /* Caller will do the rest of this. */
8077 if (ctype
!= NULL_TREE
)
8078 grokclassfn (ctype
, decl
, flags
);
8081 if (cxx_dialect
>= cxx11
8082 && DECL_DESTRUCTOR_P (decl
)
8083 && !TYPE_BEING_DEFINED (DECL_CONTEXT (decl
))
8084 && !processing_template_decl
)
8085 deduce_noexcept_on_destructor (decl
);
8087 decl
= check_explicit_specialization (orig_declarator
, decl
,
8090 4 * (friendp
!= 0) +
8092 if (decl
== error_mark_node
)
8095 if (DECL_STATIC_FUNCTION_P (decl
))
8096 check_static_quals (decl
, quals
);
8100 cplus_decl_attributes (&decl
, *attrlist
, 0);
8101 *attrlist
= NULL_TREE
;
8104 /* Check main's type after attributes have been applied. */
8105 if (ctype
== NULL_TREE
&& DECL_MAIN_P (decl
))
8107 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl
)),
8110 tree oldtypeargs
= TYPE_ARG_TYPES (TREE_TYPE (decl
));
8112 error ("%<::main%> must return %<int%>");
8113 newtype
= build_function_type (integer_type_node
, oldtypeargs
);
8114 TREE_TYPE (decl
) = newtype
;
8117 check_main_parameter_types (decl
);
8120 if (ctype
!= NULL_TREE
8121 && (! TYPE_FOR_JAVA (ctype
) || check_java_method (decl
))
8124 tree old_decl
= check_classfn (ctype
, decl
,
8125 (processing_template_decl
8126 > template_class_depth (ctype
))
8127 ? current_template_parms
8130 if (old_decl
== error_mark_node
)
8138 if (TREE_CODE (old_decl
) == TEMPLATE_DECL
)
8139 /* Because grokfndecl is always supposed to return a
8140 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
8141 here. We depend on our callers to figure out that its
8142 really a template that's being returned. */
8143 old_decl
= DECL_TEMPLATE_RESULT (old_decl
);
8145 if (DECL_STATIC_FUNCTION_P (old_decl
)
8146 && TREE_CODE (TREE_TYPE (decl
)) == METHOD_TYPE
)
8148 /* Remove the `this' parm added by grokclassfn. */
8149 revert_static_member_fn (decl
);
8150 check_static_quals (decl
, quals
);
8152 if (DECL_ARTIFICIAL (old_decl
))
8154 error ("definition of implicitly-declared %qD", old_decl
);
8157 else if (DECL_DEFAULTED_FN (old_decl
))
8159 error ("definition of explicitly-defaulted %q+D", decl
);
8160 error ("%q+#D explicitly defaulted here", old_decl
);
8164 /* Since we've smashed OLD_DECL to its
8165 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
8166 if (TREE_CODE (decl
) == TEMPLATE_DECL
)
8167 decl
= DECL_TEMPLATE_RESULT (decl
);
8169 /* Attempt to merge the declarations. This can fail, in
8170 the case of some invalid specialization declarations. */
8171 pushed_scope
= push_scope (ctype
);
8172 ok
= duplicate_decls (decl
, old_decl
, friendp
);
8174 pop_scope (pushed_scope
);
8177 error ("no %q#D member function declared in class %qT",
8181 if (ok
== error_mark_node
)
8187 if (DECL_CONSTRUCTOR_P (decl
) && !grok_ctor_properties (ctype
, decl
))
8190 if (ctype
== NULL_TREE
|| check
)
8194 DECL_VIRTUAL_P (decl
) = 1;
8199 /* decl is a FUNCTION_DECL.
8200 specifiers are the parsed virt-specifiers.
8202 Set flags to reflect the virt-specifiers.
8207 set_virt_specifiers (tree decl
, cp_virt_specifiers specifiers
)
8209 if (decl
== NULL_TREE
)
8211 if (specifiers
& VIRT_SPEC_OVERRIDE
)
8212 DECL_OVERRIDE_P (decl
) = 1;
8213 if (specifiers
& VIRT_SPEC_FINAL
)
8214 DECL_FINAL_P (decl
) = 1;
8218 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
8219 the linkage that DECL will receive in the object file. */
8222 set_linkage_for_static_data_member (tree decl
)
8224 /* A static data member always has static storage duration and
8225 external linkage. Note that static data members are forbidden in
8226 local classes -- the only situation in which a class has
8227 non-external linkage. */
8228 TREE_PUBLIC (decl
) = 1;
8229 TREE_STATIC (decl
) = 1;
8230 /* For non-template classes, static data members are always put
8231 out in exactly those files where they are defined, just as
8232 with ordinary namespace-scope variables. */
8233 if (!processing_template_decl
)
8234 DECL_INTERFACE_KNOWN (decl
) = 1;
8237 /* Create a VAR_DECL named NAME with the indicated TYPE.
8239 If SCOPE is non-NULL, it is the class type or namespace containing
8240 the variable. If SCOPE is NULL, the variable should is created in
8241 the innermost enclosing scope. */
8244 grokvardecl (tree type
,
8246 tree orig_declarator
,
8247 const cp_decl_specifier_seq
*declspecs
,
8254 tree explicit_scope
;
8256 gcc_assert (!name
|| identifier_p (name
));
8258 bool constp
= flags
&1;
8259 bool conceptp
= flags
&2;
8261 /* Compute the scope in which to place the variable, but remember
8262 whether or not that scope was explicitly specified by the user. */
8263 explicit_scope
= scope
;
8266 /* An explicit "extern" specifier indicates a namespace-scope
8268 if (declspecs
->storage_class
== sc_extern
)
8269 scope
= current_decl_namespace ();
8270 else if (!at_function_scope_p ())
8271 scope
= current_scope ();
8275 && (/* If the variable is a namespace-scope variable declared in a
8276 template, we need DECL_LANG_SPECIFIC. */
8277 (TREE_CODE (scope
) == NAMESPACE_DECL
&& processing_template_decl
)
8278 /* Similarly for namespace-scope variables with language linkage
8280 || (TREE_CODE (scope
) == NAMESPACE_DECL
8281 && current_lang_name
!= lang_name_cplusplus
)
8282 /* Similarly for static data members. */
8284 /* Similarly for explicit specializations. */
8286 && TREE_CODE (orig_declarator
) == TEMPLATE_ID_EXPR
)))
8287 decl
= build_lang_decl (VAR_DECL
, name
, type
);
8289 decl
= build_decl (input_location
, VAR_DECL
, name
, type
);
8291 if (explicit_scope
&& TREE_CODE (explicit_scope
) == NAMESPACE_DECL
)
8292 set_decl_namespace (decl
, explicit_scope
, 0);
8294 DECL_CONTEXT (decl
) = FROB_CONTEXT (scope
);
8296 if (declspecs
->storage_class
== sc_extern
)
8298 DECL_THIS_EXTERN (decl
) = 1;
8299 DECL_EXTERNAL (decl
) = !initialized
;
8302 if (DECL_CLASS_SCOPE_P (decl
))
8304 set_linkage_for_static_data_member (decl
);
8305 /* This function is only called with out-of-class definitions. */
8306 DECL_EXTERNAL (decl
) = 0;
8307 check_class_member_definition_namespace (decl
);
8309 /* At top level, either `static' or no s.c. makes a definition
8310 (perhaps tentative), and absence of `static' makes it public. */
8311 else if (toplevel_bindings_p ())
8313 TREE_PUBLIC (decl
) = (declspecs
->storage_class
!= sc_static
8314 && (DECL_THIS_EXTERN (decl
) || ! constp
));
8315 TREE_STATIC (decl
) = ! DECL_EXTERNAL (decl
);
8317 /* Not at top level, only `static' makes a static definition. */
8320 TREE_STATIC (decl
) = declspecs
->storage_class
== sc_static
;
8321 TREE_PUBLIC (decl
) = DECL_EXTERNAL (decl
);
8324 if (decl_spec_seq_has_spec_p (declspecs
, ds_thread
))
8326 if (DECL_EXTERNAL (decl
) || TREE_STATIC (decl
))
8328 CP_DECL_THREAD_LOCAL_P (decl
) = true;
8329 if (!processing_template_decl
)
8330 set_decl_tls_model (decl
, decl_default_tls_model (decl
));
8332 if (declspecs
->gnu_thread_keyword_p
)
8333 SET_DECL_GNU_TLS_P (decl
);
8336 /* If the type of the decl has no linkage, make sure that we'll
8337 notice that in mark_used. */
8338 if (cxx_dialect
> cxx98
8339 && decl_linkage (decl
) != lk_none
8340 && DECL_LANG_SPECIFIC (decl
) == NULL
8341 && !DECL_EXTERN_C_P (decl
)
8342 && no_linkage_check (TREE_TYPE (decl
), /*relaxed_p=*/false))
8343 retrofit_lang_decl (decl
);
8345 if (TREE_PUBLIC (decl
))
8347 /* [basic.link]: A name with no linkage (notably, the name of a class
8348 or enumeration declared in a local scope) shall not be used to
8349 declare an entity with linkage.
8351 DR 757 relaxes this restriction for C++0x. */
8352 if (cxx_dialect
< cxx11
)
8353 no_linkage_error (decl
);
8356 DECL_INTERFACE_KNOWN (decl
) = 1;
8358 if (DECL_NAME (decl
)
8359 && MAIN_NAME_P (DECL_NAME (decl
))
8360 && scope
== global_namespace
)
8361 error ("cannot declare %<::main%> to be a global variable");
8363 /* Check that the variable can be safely declared as a concept.
8364 Note that this also forbids explicit specializations. */
8367 if (!processing_template_decl
)
8369 error ("a non-template variable cannot be %<concept%>");
8373 DECL_DECLARED_CONCEPT_P (decl
) = true;
8374 if (!same_type_ignoring_top_level_qualifiers_p (type
, boolean_type_node
))
8375 error_at (declspecs
->locations
[ds_type_spec
],
8376 "concept must have type %<bool%>");
8378 else if (flag_concepts
8379 && processing_template_decl
> template_class_depth (scope
))
8381 tree reqs
= TEMPLATE_PARMS_CONSTRAINTS (current_template_parms
);
8382 tree ci
= build_constraints (reqs
, NULL_TREE
);
8383 set_constraints (decl
, ci
);
8386 // Handle explicit specializations and instantiations of variable templates.
8387 if (orig_declarator
)
8388 decl
= check_explicit_specialization (orig_declarator
, decl
,
8389 template_count
, conceptp
* 8);
8391 return decl
!= error_mark_node
? decl
: NULL_TREE
;
8394 /* Create and return a canonical pointer to member function type, for
8395 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
8398 build_ptrmemfunc_type (tree type
)
8403 if (type
== error_mark_node
)
8406 /* Make sure that we always have the unqualified pointer-to-member
8408 if (cp_cv_quals quals
= cp_type_quals (type
))
8410 tree unqual
= build_ptrmemfunc_type (TYPE_MAIN_VARIANT (type
));
8411 return cp_build_qualified_type (unqual
, quals
);
8414 /* If a canonical type already exists for this type, use it. We use
8415 this method instead of type_hash_canon, because it only does a
8416 simple equality check on the list of field members. */
8418 if ((t
= TYPE_GET_PTRMEMFUNC_TYPE (type
)))
8421 t
= make_node (RECORD_TYPE
);
8423 /* Let the front end know this is a pointer to member function. */
8424 TYPE_PTRMEMFUNC_FLAG (t
) = 1;
8426 field
= build_decl (input_location
, FIELD_DECL
, pfn_identifier
, type
);
8429 field
= build_decl (input_location
, FIELD_DECL
, delta_identifier
,
8431 DECL_CHAIN (field
) = fields
;
8434 finish_builtin_struct (t
, "__ptrmemfunc_type", fields
, ptr_type_node
);
8436 /* Zap out the name so that the back end will give us the debugging
8437 information for this anonymous RECORD_TYPE. */
8438 TYPE_NAME (t
) = NULL_TREE
;
8440 /* Cache this pointer-to-member type so that we can find it again
8442 TYPE_SET_PTRMEMFUNC_TYPE (type
, t
);
8444 if (TYPE_STRUCTURAL_EQUALITY_P (type
))
8445 SET_TYPE_STRUCTURAL_EQUALITY (t
);
8446 else if (TYPE_CANONICAL (type
) != type
)
8447 TYPE_CANONICAL (t
) = build_ptrmemfunc_type (TYPE_CANONICAL (type
));
8452 /* Create and return a pointer to data member type. */
8455 build_ptrmem_type (tree class_type
, tree member_type
)
8457 if (TREE_CODE (member_type
) == METHOD_TYPE
)
8459 cp_cv_quals quals
= type_memfn_quals (member_type
);
8460 cp_ref_qualifier rqual
= type_memfn_rqual (member_type
);
8461 member_type
= build_memfn_type (member_type
, class_type
, quals
, rqual
);
8462 return build_ptrmemfunc_type (build_pointer_type (member_type
));
8466 gcc_assert (TREE_CODE (member_type
) != FUNCTION_TYPE
);
8467 return build_offset_type (class_type
, member_type
);
8471 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
8472 Check to see that the definition is valid. Issue appropriate error
8473 messages. Return 1 if the definition is particularly bad, or 0
8477 check_static_variable_definition (tree decl
, tree type
)
8479 /* Can't check yet if we don't know the type. */
8480 if (dependent_type_p (type
))
8482 /* If DECL is declared constexpr, we'll do the appropriate checks
8483 in check_initializer. */
8484 if (DECL_P (decl
) && DECL_DECLARED_CONSTEXPR_P (decl
))
8486 else if (cxx_dialect
>= cxx11
&& !INTEGRAL_OR_ENUMERATION_TYPE_P (type
))
8488 if (!COMPLETE_TYPE_P (type
))
8489 error ("in-class initialization of static data member %q#D of "
8490 "incomplete type", decl
);
8491 else if (literal_type_p (type
))
8492 permerror (input_location
,
8493 "%<constexpr%> needed for in-class initialization of "
8494 "static data member %q#D of non-integral type", decl
);
8496 error ("in-class initialization of static data member %q#D of "
8497 "non-literal type", decl
);
8501 /* Motion 10 at San Diego: If a static const integral data member is
8502 initialized with an integral constant expression, the initializer
8503 may appear either in the declaration (within the class), or in
8504 the definition, but not both. If it appears in the class, the
8505 member is a member constant. The file-scope definition is always
8507 if (!ARITHMETIC_TYPE_P (type
) && TREE_CODE (type
) != ENUMERAL_TYPE
)
8509 error ("invalid in-class initialization of static data member "
8510 "of non-integral type %qT",
8514 else if (!CP_TYPE_CONST_P (type
))
8515 error ("ISO C++ forbids in-class initialization of non-const "
8516 "static member %qD",
8518 else if (!INTEGRAL_OR_ENUMERATION_TYPE_P (type
))
8519 pedwarn (input_location
, OPT_Wpedantic
, "ISO C++ forbids initialization of member constant "
8520 "%qD of non-integral type %qT", decl
, type
);
8525 /* *expr_p is part of the TYPE_SIZE of a variably-sized array. If any
8526 SAVE_EXPRs in *expr_p wrap expressions with side-effects, break those
8527 expressions out into temporary variables so that walk_tree doesn't
8528 step into them (c++/15764). */
8531 stabilize_save_expr_r (tree
*expr_p
, int *walk_subtrees
, void *data
)
8533 hash_set
<tree
> *pset
= (hash_set
<tree
> *)data
;
8534 tree expr
= *expr_p
;
8535 if (TREE_CODE (expr
) == SAVE_EXPR
)
8537 tree op
= TREE_OPERAND (expr
, 0);
8538 cp_walk_tree (&op
, stabilize_save_expr_r
, data
, pset
);
8539 if (TREE_SIDE_EFFECTS (op
))
8540 TREE_OPERAND (expr
, 0) = get_temp_regvar (TREE_TYPE (op
), op
);
8543 else if (!EXPR_P (expr
) || !TREE_SIDE_EFFECTS (expr
))
8548 /* Entry point for the above. */
8551 stabilize_vla_size (tree size
)
8553 hash_set
<tree
> pset
;
8554 /* Break out any function calls into temporary variables. */
8555 cp_walk_tree (&size
, stabilize_save_expr_r
, &pset
, &pset
);
8558 /* Helper function for compute_array_index_type. Look for SIZEOF_EXPR
8559 not inside of SAVE_EXPR and fold them. */
8562 fold_sizeof_expr_r (tree
*expr_p
, int *walk_subtrees
, void *data
)
8564 tree expr
= *expr_p
;
8565 if (TREE_CODE (expr
) == SAVE_EXPR
|| TYPE_P (expr
))
8567 else if (TREE_CODE (expr
) == SIZEOF_EXPR
)
8569 *(bool *)data
= true;
8570 if (SIZEOF_EXPR_TYPE_P (expr
))
8571 expr
= cxx_sizeof_or_alignof_type (TREE_TYPE (TREE_OPERAND (expr
, 0)),
8572 SIZEOF_EXPR
, false);
8573 else if (TYPE_P (TREE_OPERAND (expr
, 0)))
8574 expr
= cxx_sizeof_or_alignof_type (TREE_OPERAND (expr
, 0), SIZEOF_EXPR
,
8577 expr
= cxx_sizeof_or_alignof_expr (TREE_OPERAND (expr
, 0), SIZEOF_EXPR
,
8579 if (expr
== error_mark_node
)
8580 expr
= size_one_node
;
8587 /* Given the SIZE (i.e., number of elements) in an array, compute an
8588 appropriate index type for the array. If non-NULL, NAME is the
8589 name of the thing being declared. */
8592 compute_array_index_type (tree name
, tree size
, tsubst_flags_t complain
)
8597 if (error_operand_p (size
))
8598 return error_mark_node
;
8600 if (!type_dependent_expression_p (size
))
8602 tree type
= TREE_TYPE (size
);
8604 mark_rvalue_use (size
);
8606 if (cxx_dialect
< cxx11
&& TREE_CODE (size
) == NOP_EXPR
8607 && TREE_SIDE_EFFECTS (size
))
8608 /* In C++98, we mark a non-constant array bound with a magic
8609 NOP_EXPR with TREE_SIDE_EFFECTS; don't fold in that case. */;
8612 size
= instantiate_non_dependent_expr_sfinae (size
, complain
);
8614 if (CLASS_TYPE_P (type
)
8615 && CLASSTYPE_LITERAL_P (type
))
8617 size
= build_expr_type_conversion (WANT_INT
, size
, true);
8620 if (!(complain
& tf_error
))
8621 return error_mark_node
;
8623 error ("size of array %qD has non-integral type %qT",
8626 error ("size of array has non-integral type %qT", type
);
8627 size
= integer_one_node
;
8629 if (size
== error_mark_node
)
8630 return error_mark_node
;
8631 type
= TREE_TYPE (size
);
8634 if (INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type
))
8635 size
= maybe_constant_value (size
);
8637 if (!TREE_CONSTANT (size
))
8641 if (error_operand_p (size
))
8642 return error_mark_node
;
8644 /* The array bound must be an integer type. */
8645 if (!INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type
))
8647 if (!(complain
& tf_error
))
8648 return error_mark_node
;
8650 error ("size of array %qD has non-integral type %qT", name
, type
);
8652 error ("size of array has non-integral type %qT", type
);
8653 size
= integer_one_node
;
8654 type
= TREE_TYPE (size
);
8658 /* A type is dependent if it is...an array type constructed from any
8659 dependent type or whose size is specified by a constant expression
8660 that is value-dependent. */
8661 /* We can only call value_dependent_expression_p on integral constant
8662 expressions; treat non-constant expressions as dependent, too. */
8663 if (processing_template_decl
8664 && (type_dependent_expression_p (size
)
8665 || !TREE_CONSTANT (size
) || value_dependent_expression_p (size
)))
8667 /* We cannot do any checking for a SIZE that isn't known to be
8668 constant. Just build the index type and mark that it requires
8669 structural equality checks. */
8670 itype
= build_index_type (build_min (MINUS_EXPR
, sizetype
,
8671 size
, size_one_node
));
8672 TYPE_DEPENDENT_P (itype
) = 1;
8673 TYPE_DEPENDENT_P_VALID (itype
) = 1;
8674 SET_TYPE_STRUCTURAL_EQUALITY (itype
);
8678 /* Normally, the array-bound will be a constant. */
8679 if (TREE_CODE (size
) == INTEGER_CST
)
8681 /* Check to see if the array bound overflowed. Make that an
8682 error, no matter how generous we're being. */
8683 constant_expression_error (size
);
8685 /* An array must have a positive number of elements. */
8686 if (tree_int_cst_lt (size
, integer_zero_node
))
8688 if (!(complain
& tf_error
))
8689 return error_mark_node
;
8691 error ("size of array %qD is negative", name
);
8693 error ("size of array is negative");
8694 size
= integer_one_node
;
8696 /* As an extension we allow zero-sized arrays. */
8697 else if (integer_zerop (size
))
8699 if (!(complain
& tf_error
))
8700 /* We must fail if performing argument deduction (as
8701 indicated by the state of complain), so that
8702 another substitution can be found. */
8703 return error_mark_node
;
8704 else if (in_system_header_at (input_location
))
8705 /* Allow them in system headers because glibc uses them. */;
8707 pedwarn (input_location
, OPT_Wpedantic
, "ISO C++ forbids zero-size array %qD", name
);
8709 pedwarn (input_location
, OPT_Wpedantic
, "ISO C++ forbids zero-size array");
8712 else if (TREE_CONSTANT (size
)
8713 /* We don't allow VLAs at non-function scopes, or during
8714 tentative template substitution. */
8715 || !at_function_scope_p ()
8716 || !(complain
& tf_error
))
8718 if (!(complain
& tf_error
))
8719 return error_mark_node
;
8720 /* `(int) &fn' is not a valid array bound. */
8722 error ("size of array %qD is not an integral constant-expression",
8725 error ("size of array is not an integral constant-expression");
8726 size
= integer_one_node
;
8728 else if (pedantic
&& warn_vla
!= 0)
8731 pedwarn (input_location
, OPT_Wvla
, "ISO C++ forbids variable length array %qD", name
);
8733 pedwarn (input_location
, OPT_Wvla
, "ISO C++ forbids variable length array");
8735 else if (warn_vla
> 0)
8739 "variable length array %qD is used", name
);
8742 "variable length array is used");
8745 if (processing_template_decl
&& !TREE_CONSTANT (size
))
8746 /* A variable sized array. */
8747 itype
= build_min (MINUS_EXPR
, sizetype
, size
, integer_one_node
);
8750 HOST_WIDE_INT saved_processing_template_decl
;
8752 /* Compute the index of the largest element in the array. It is
8753 one less than the number of elements in the array. We save
8754 and restore PROCESSING_TEMPLATE_DECL so that computations in
8755 cp_build_binary_op will be appropriately folded. */
8756 saved_processing_template_decl
= processing_template_decl
;
8757 processing_template_decl
= 0;
8758 itype
= cp_build_binary_op (input_location
,
8760 cp_convert (ssizetype
, size
, complain
),
8761 cp_convert (ssizetype
, integer_one_node
,
8764 itype
= fold (itype
);
8765 processing_template_decl
= saved_processing_template_decl
;
8767 if (!TREE_CONSTANT (itype
))
8769 /* A variable sized array. */
8770 itype
= variable_size (itype
);
8772 if (TREE_CODE (itype
) != SAVE_EXPR
)
8774 /* Look for SIZEOF_EXPRs in itype and fold them, otherwise
8775 they might survive till gimplification. */
8776 tree newitype
= itype
;
8778 cp_walk_tree_without_duplicates (&newitype
,
8779 fold_sizeof_expr_r
, &found
);
8781 itype
= variable_size (fold (newitype
));
8784 stabilize_vla_size (itype
);
8786 if (flag_sanitize
& SANITIZE_VLA
8787 && do_ubsan_in_current_function ())
8789 /* We have to add 1 -- in the ubsan routine we generate
8790 LE_EXPR rather than LT_EXPR. */
8791 tree t
= fold_build2 (PLUS_EXPR
, TREE_TYPE (itype
), itype
,
8792 build_one_cst (TREE_TYPE (itype
)));
8793 t
= ubsan_instrument_vla (input_location
, t
);
8794 finish_expr_stmt (t
);
8797 /* Make sure that there was no overflow when creating to a signed
8798 index type. (For example, on a 32-bit machine, an array with
8799 size 2^32 - 1 is too big.) */
8800 else if (TREE_CODE (itype
) == INTEGER_CST
8801 && TREE_OVERFLOW (itype
))
8803 if (!(complain
& tf_error
))
8804 return error_mark_node
;
8805 error ("overflow in array dimension");
8806 TREE_OVERFLOW (itype
) = 0;
8810 /* Create and return the appropriate index type. */
8811 itype
= build_index_type (itype
);
8813 /* If the index type were dependent, we would have returned early, so
8814 remember that it isn't. */
8815 TYPE_DEPENDENT_P (itype
) = 0;
8816 TYPE_DEPENDENT_P_VALID (itype
) = 1;
8820 /* Returns the scope (if any) in which the entity declared by
8821 DECLARATOR will be located. If the entity was declared with an
8822 unqualified name, NULL_TREE is returned. */
8825 get_scope_of_declarator (const cp_declarator
*declarator
)
8827 while (declarator
&& declarator
->kind
!= cdk_id
)
8828 declarator
= declarator
->declarator
;
8830 /* If the declarator-id is a SCOPE_REF, the scope in which the
8831 declaration occurs is the first operand. */
8833 && declarator
->u
.id
.qualifying_scope
)
8834 return declarator
->u
.id
.qualifying_scope
;
8836 /* Otherwise, the declarator is not a qualified name; the entity will
8837 be declared in the current scope. */
8841 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
8842 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
8846 create_array_type_for_decl (tree name
, tree type
, tree size
)
8848 tree itype
= NULL_TREE
;
8850 /* If things have already gone awry, bail now. */
8851 if (type
== error_mark_node
|| size
== error_mark_node
)
8852 return error_mark_node
;
8854 /* 8.3.4/1: If the type of the identifier of D contains the auto
8855 type-specifier, the program is ill-formed. */
8856 if (type_uses_auto (type
))
8858 error ("%qD declared as array of %qT", name
, type
);
8859 return error_mark_node
;
8862 /* If there are some types which cannot be array elements,
8863 issue an error-message and return. */
8864 switch (TREE_CODE (type
))
8868 error ("declaration of %qD as array of void", name
);
8870 error ("creating array of void");
8871 return error_mark_node
;
8875 error ("declaration of %qD as array of functions", name
);
8877 error ("creating array of functions");
8878 return error_mark_node
;
8880 case REFERENCE_TYPE
:
8882 error ("declaration of %qD as array of references", name
);
8884 error ("creating array of references");
8885 return error_mark_node
;
8889 error ("declaration of %qD as array of function members", name
);
8891 error ("creating array of function members");
8892 return error_mark_node
;
8900 The constant expressions that specify the bounds of the arrays
8901 can be omitted only for the first member of the sequence. */
8902 if (TREE_CODE (type
) == ARRAY_TYPE
&& !TYPE_DOMAIN (type
))
8905 error ("declaration of %qD as multidimensional array must "
8906 "have bounds for all dimensions except the first",
8909 error ("multidimensional array must have bounds for all "
8910 "dimensions except the first");
8912 return error_mark_node
;
8915 /* Figure out the index type for the array. */
8917 itype
= compute_array_index_type (name
, size
, tf_warning_or_error
);
8920 T is called the array element type; this type shall not be [...] an
8921 abstract class type. */
8922 abstract_virtuals_error (name
, type
);
8924 return build_cplus_array_type (type
, itype
);
8927 /* Returns the smallest location != UNKNOWN_LOCATION among the
8928 three stored in LOCATIONS[ds_const], LOCATIONS[ds_volatile],
8929 and LOCATIONS[ds_restrict]. */
8932 smallest_type_quals_location (int type_quals
, const location_t
* locations
)
8934 location_t loc
= UNKNOWN_LOCATION
;
8936 if (type_quals
& TYPE_QUAL_CONST
)
8937 loc
= locations
[ds_const
];
8939 if ((type_quals
& TYPE_QUAL_VOLATILE
)
8940 && (loc
== UNKNOWN_LOCATION
|| locations
[ds_volatile
] < loc
))
8941 loc
= locations
[ds_volatile
];
8943 if ((type_quals
& TYPE_QUAL_RESTRICT
)
8944 && (loc
== UNKNOWN_LOCATION
|| locations
[ds_restrict
] < loc
))
8945 loc
= locations
[ds_restrict
];
8950 /* Check that it's OK to declare a function with the indicated TYPE
8951 and TYPE_QUALS. SFK indicates the kind of special function (if any)
8952 that this function is. OPTYPE is the type given in a conversion
8953 operator declaration, or the class type for a constructor/destructor.
8954 Returns the actual return type of the function; that may be different
8955 than TYPE if an error occurs, or for certain special functions. */
8958 check_special_function_return_type (special_function_kind sfk
,
8962 const location_t
* locations
)
8966 case sfk_constructor
:
8968 error ("return type specification for constructor invalid");
8969 else if (type_quals
!= TYPE_UNQUALIFIED
)
8970 error_at (smallest_type_quals_location (type_quals
, locations
),
8971 "qualifiers are not allowed on constructor declaration");
8973 if (targetm
.cxx
.cdtor_returns_this () && !TYPE_FOR_JAVA (optype
))
8974 type
= build_pointer_type (optype
);
8976 type
= void_type_node
;
8979 case sfk_destructor
:
8981 error ("return type specification for destructor invalid");
8982 else if (type_quals
!= TYPE_UNQUALIFIED
)
8983 error_at (smallest_type_quals_location (type_quals
, locations
),
8984 "qualifiers are not allowed on destructor declaration");
8986 /* We can't use the proper return type here because we run into
8987 problems with ambiguous bases and covariant returns.
8988 Java classes are left unchanged because (void *) isn't a valid
8989 Java type, and we don't want to change the Java ABI. */
8990 if (targetm
.cxx
.cdtor_returns_this () && !TYPE_FOR_JAVA (optype
))
8991 type
= build_pointer_type (void_type_node
);
8993 type
= void_type_node
;
8996 case sfk_conversion
:
8998 error ("return type specified for %<operator %T%>", optype
);
8999 else if (type_quals
!= TYPE_UNQUALIFIED
)
9000 error_at (smallest_type_quals_location (type_quals
, locations
),
9001 "qualifiers are not allowed on declaration of "
9002 "%<operator %T%>", optype
);
9014 /* A variable or data member (whose unqualified name is IDENTIFIER)
9015 has been declared with the indicated TYPE. If the TYPE is not
9016 acceptable, issue an error message and return a type to use for
9017 error-recovery purposes. */
9020 check_var_type (tree identifier
, tree type
)
9022 if (VOID_TYPE_P (type
))
9025 error ("unnamed variable or field declared void");
9026 else if (identifier_p (identifier
))
9028 gcc_assert (!IDENTIFIER_OPNAME_P (identifier
));
9029 error ("variable or field %qE declared void", identifier
);
9032 error ("variable or field declared void");
9033 type
= error_mark_node
;
9039 /* Given declspecs and a declarator (abstract or otherwise), determine
9040 the name and type of the object declared and construct a DECL node
9043 DECLSPECS points to the representation of declaration-specifier
9044 sequence that precedes declarator.
9046 DECL_CONTEXT says which syntactic context this declaration is in:
9047 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
9048 FUNCDEF for a function definition. Like NORMAL but a few different
9049 error messages in each case. Return value may be zero meaning
9050 this definition is too screwy to try to parse.
9051 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
9052 handle member functions (which have FIELD context).
9053 Return value may be zero meaning this definition is too screwy to
9055 PARM for a parameter declaration (either within a function prototype
9056 or before a function body). Make a PARM_DECL, or return void_type_node.
9057 TPARM for a template parameter declaration.
9058 CATCHPARM for a parameter declaration before a catch clause.
9059 TYPENAME if for a typename (in a cast or sizeof).
9060 Don't make a DECL node; just return the ..._TYPE node.
9061 FIELD for a struct or union field; make a FIELD_DECL.
9062 BITFIELD for a field with specified width.
9064 INITIALIZED is as for start_decl.
9066 ATTRLIST is a pointer to the list of attributes, which may be NULL
9067 if there are none; *ATTRLIST may be modified if attributes from inside
9068 the declarator should be applied to the declaration.
9070 When this function is called, scoping variables (such as
9071 CURRENT_CLASS_TYPE) should reflect the scope in which the
9072 declaration occurs, not the scope in which the new declaration will
9073 be placed. For example, on:
9077 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
9080 Returns a DECL (if a declarator is present), a TYPE (if there is no
9081 declarator, in cases like "struct S;"), or the ERROR_MARK_NODE if an
9085 grokdeclarator (const cp_declarator
*declarator
,
9086 cp_decl_specifier_seq
*declspecs
,
9087 enum decl_context decl_context
,
9091 tree type
= NULL_TREE
;
9093 int explicit_intN
= 0;
9094 int virtualp
, explicitp
, friendp
, inlinep
, staticp
;
9095 int explicit_int
= 0;
9096 int explicit_char
= 0;
9097 int defaulted_int
= 0;
9099 tree typedef_decl
= NULL_TREE
;
9100 const char *name
= NULL
;
9101 tree typedef_type
= NULL_TREE
;
9102 /* True if this declarator is a function definition. */
9103 bool funcdef_flag
= false;
9104 cp_declarator_kind innermost_code
= cdk_error
;
9107 /* See the code below that used this. */
9108 tree decl_attr
= NULL_TREE
;
9111 /* Keep track of what sort of function is being processed
9112 so that we can warn about default return values, or explicit
9113 return values which do not match prescribed defaults. */
9114 special_function_kind sfk
= sfk_none
;
9116 tree dname
= NULL_TREE
;
9117 tree ctor_return_type
= NULL_TREE
;
9118 enum overload_flags flags
= NO_SPECIAL
;
9119 /* cv-qualifiers that apply to the declarator, for a declaration of
9120 a member function. */
9121 cp_cv_quals memfn_quals
= TYPE_UNQUALIFIED
;
9122 /* virt-specifiers that apply to the declarator, for a declaration of
9123 a member function. */
9124 cp_virt_specifiers virt_specifiers
= VIRT_SPEC_UNSPECIFIED
;
9125 /* ref-qualifier that applies to the declarator, for a declaration of
9126 a member function. */
9127 cp_ref_qualifier rqual
= REF_QUAL_NONE
;
9128 /* cv-qualifiers that apply to the type specified by the DECLSPECS. */
9129 int type_quals
= TYPE_UNQUALIFIED
;
9130 tree raises
= NULL_TREE
;
9131 int template_count
= 0;
9132 tree returned_attrs
= NULL_TREE
;
9133 tree parms
= NULL_TREE
;
9134 const cp_declarator
*id_declarator
;
9135 /* The unqualified name of the declarator; either an
9136 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
9137 tree unqualified_id
;
9138 /* The class type, if any, in which this entity is located,
9139 or NULL_TREE if none. Note that this value may be different from
9140 the current class type; for example if an attempt is made to declare
9141 "A::f" inside "B", this value will be "A". */
9142 tree ctype
= current_class_type
;
9143 /* The NAMESPACE_DECL for the namespace in which this entity is
9144 located. If an unqualified name is used to declare the entity,
9145 this value will be NULL_TREE, even if the entity is located at
9147 tree in_namespace
= NULL_TREE
;
9148 cp_storage_class storage_class
;
9149 bool unsigned_p
, signed_p
, short_p
, long_p
, thread_p
;
9150 bool type_was_error_mark_node
= false;
9151 bool parameter_pack_p
= declarator
? declarator
->parameter_pack_p
: false;
9152 bool template_type_arg
= false;
9153 bool template_parm_flag
= false;
9154 bool typedef_p
= decl_spec_seq_has_spec_p (declspecs
, ds_typedef
);
9155 bool constexpr_p
= decl_spec_seq_has_spec_p (declspecs
, ds_constexpr
);
9156 bool late_return_type_p
= false;
9157 bool array_parameter_p
= false;
9158 source_location saved_loc
= input_location
;
9160 tree reqs
= NULL_TREE
;
9162 signed_p
= decl_spec_seq_has_spec_p (declspecs
, ds_signed
);
9163 unsigned_p
= decl_spec_seq_has_spec_p (declspecs
, ds_unsigned
);
9164 short_p
= decl_spec_seq_has_spec_p (declspecs
, ds_short
);
9165 long_p
= decl_spec_seq_has_spec_p (declspecs
, ds_long
);
9166 longlong
= decl_spec_seq_has_spec_p (declspecs
, ds_long_long
);
9167 explicit_intN
= declspecs
->explicit_intN_p
;
9168 thread_p
= decl_spec_seq_has_spec_p (declspecs
, ds_thread
);
9170 // Was concept_p specified? Note that ds_concept
9171 // implies ds_constexpr!
9172 bool concept_p
= decl_spec_seq_has_spec_p (declspecs
, ds_concept
);
9176 if (decl_spec_seq_has_spec_p (declspecs
, ds_const
))
9177 type_quals
|= TYPE_QUAL_CONST
;
9178 if (decl_spec_seq_has_spec_p (declspecs
, ds_volatile
))
9179 type_quals
|= TYPE_QUAL_VOLATILE
;
9180 if (decl_spec_seq_has_spec_p (declspecs
, ds_restrict
))
9181 type_quals
|= TYPE_QUAL_RESTRICT
;
9183 if (decl_context
== FUNCDEF
)
9184 funcdef_flag
= true, decl_context
= NORMAL
;
9185 else if (decl_context
== MEMFUNCDEF
)
9186 funcdef_flag
= true, decl_context
= FIELD
;
9187 else if (decl_context
== BITFIELD
)
9188 bitfield
= 1, decl_context
= FIELD
;
9189 else if (decl_context
== TEMPLATE_TYPE_ARG
)
9190 template_type_arg
= true, decl_context
= TYPENAME
;
9191 else if (decl_context
== TPARM
)
9192 template_parm_flag
= true, decl_context
= PARM
;
9194 if (initialized
> 1)
9195 funcdef_flag
= true;
9197 /* Look inside a declarator for the name being declared
9198 and get it as a string, for an error message. */
9199 for (id_declarator
= declarator
;
9201 id_declarator
= id_declarator
->declarator
)
9203 if (id_declarator
->kind
!= cdk_id
)
9204 innermost_code
= id_declarator
->kind
;
9206 switch (id_declarator
->kind
)
9209 if (id_declarator
->declarator
9210 && id_declarator
->declarator
->kind
== cdk_id
)
9212 sfk
= id_declarator
->declarator
->u
.id
.sfk
;
9213 if (sfk
== sfk_destructor
)
9220 tree qualifying_scope
= id_declarator
->u
.id
.qualifying_scope
;
9221 tree decl
= id_declarator
->u
.id
.unqualified_name
;
9224 if (qualifying_scope
)
9226 if (at_function_scope_p ())
9230 A declarator-id shall not be qualified except
9233 None of the cases are permitted in block
9235 if (qualifying_scope
== global_namespace
)
9236 error ("invalid use of qualified-name %<::%D%>",
9238 else if (TYPE_P (qualifying_scope
))
9239 error ("invalid use of qualified-name %<%T::%D%>",
9240 qualifying_scope
, decl
);
9242 error ("invalid use of qualified-name %<%D::%D%>",
9243 qualifying_scope
, decl
);
9244 return error_mark_node
;
9246 else if (TYPE_P (qualifying_scope
))
9248 ctype
= qualifying_scope
;
9249 if (!MAYBE_CLASS_TYPE_P (ctype
))
9251 error ("%q#T is not a class or a namespace", ctype
);
9254 else if (innermost_code
!= cdk_function
9255 && current_class_type
9256 && !uniquely_derived_from_p (ctype
,
9257 current_class_type
))
9259 error ("invalid use of qualified-name %<%T::%D%>",
9260 qualifying_scope
, decl
);
9261 return error_mark_node
;
9264 else if (TREE_CODE (qualifying_scope
) == NAMESPACE_DECL
)
9265 in_namespace
= qualifying_scope
;
9267 switch (TREE_CODE (decl
))
9273 if (innermost_code
!= cdk_function
)
9275 error ("declaration of %qD as non-function", decl
);
9276 return error_mark_node
;
9278 else if (!qualifying_scope
9279 && !(current_class_type
&& at_class_scope_p ()))
9281 error ("declaration of %qD as non-member", decl
);
9282 return error_mark_node
;
9285 type
= TREE_OPERAND (decl
, 0);
9287 type
= constructor_name (type
);
9288 name
= identifier_to_locale (IDENTIFIER_POINTER (type
));
9293 case TEMPLATE_ID_EXPR
:
9295 tree fns
= TREE_OPERAND (decl
, 0);
9298 if (!identifier_p (dname
))
9300 if (variable_template_p (dname
))
9301 dname
= DECL_NAME (dname
);
9304 gcc_assert (is_overloaded_fn (dname
));
9305 dname
= DECL_NAME (get_first_fn (dname
));
9311 case IDENTIFIER_NODE
:
9312 if (identifier_p (decl
))
9315 if (C_IS_RESERVED_WORD (dname
))
9317 error ("declarator-id missing; using reserved word %qD",
9319 name
= identifier_to_locale (IDENTIFIER_POINTER (dname
));
9321 else if (!IDENTIFIER_TYPENAME_P (dname
))
9322 name
= identifier_to_locale (IDENTIFIER_POINTER (dname
));
9325 gcc_assert (flags
== NO_SPECIAL
);
9326 flags
= TYPENAME_FLAG
;
9327 ctor_return_type
= TREE_TYPE (dname
);
9328 sfk
= sfk_conversion
;
9329 if (is_typename_at_global_scope (dname
))
9330 name
= identifier_to_locale (IDENTIFIER_POINTER (dname
));
9332 name
= "<invalid operator>";
9349 return error_mark_node
;
9354 if (id_declarator
->kind
== cdk_id
)
9360 The declarator in a function-definition shall have the form
9361 D1 ( parameter-declaration-clause) ... */
9362 if (funcdef_flag
&& innermost_code
!= cdk_function
)
9364 error ("function definition does not declare parameters");
9365 return error_mark_node
;
9368 if (flags
== TYPENAME_FLAG
9369 && innermost_code
!= cdk_function
9370 && ! (ctype
&& !declspecs
->any_specifiers_p
))
9372 error ("declaration of %qD as non-function", dname
);
9373 return error_mark_node
;
9377 && identifier_p (dname
)
9378 && UDLIT_OPER_P (dname
)
9379 && innermost_code
!= cdk_function
)
9381 error ("declaration of %qD as non-function", dname
);
9382 return error_mark_node
;
9385 if (dname
&& IDENTIFIER_OPNAME_P (dname
))
9389 error ("declaration of %qD as %<typedef%>", dname
);
9390 return error_mark_node
;
9392 else if (decl_context
== PARM
|| decl_context
== CATCHPARM
)
9394 error ("declaration of %qD as parameter", dname
);
9395 return error_mark_node
;
9399 /* Anything declared one level down from the top level
9400 must be one of the parameters of a function
9401 (because the body is at least two levels down). */
9403 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
9404 by not allowing C++ class definitions to specify their parameters
9405 with xdecls (must be spec.d in the parmlist).
9407 Since we now wait to push a class scope until we are sure that
9408 we are in a legitimate method context, we must set oldcname
9409 explicitly (since current_class_name is not yet alive).
9411 We also want to avoid calling this a PARM if it is in a namespace. */
9413 if (decl_context
== NORMAL
&& !toplevel_bindings_p ())
9415 cp_binding_level
*b
= current_binding_level
;
9416 current_binding_level
= b
->level_chain
;
9417 if (current_binding_level
!= 0 && toplevel_bindings_p ())
9418 decl_context
= PARM
;
9419 current_binding_level
= b
;
9423 name
= decl_context
== PARM
? "parameter" : "type name";
9425 if (concept_p
&& typedef_p
)
9427 error ("%<concept%> cannot appear in a typedef declaration");
9428 return error_mark_node
;
9431 if (constexpr_p
&& typedef_p
)
9433 error ("%<constexpr%> cannot appear in a typedef declaration");
9434 return error_mark_node
;
9437 /* If there were multiple types specified in the decl-specifier-seq,
9438 issue an error message. */
9439 if (declspecs
->multiple_types_p
)
9441 error ("two or more data types in declaration of %qs", name
);
9442 return error_mark_node
;
9445 if (declspecs
->conflicting_specifiers_p
)
9447 error ("conflicting specifiers in declaration of %qs", name
);
9448 return error_mark_node
;
9451 /* Extract the basic type from the decl-specifier-seq. */
9452 type
= declspecs
->type
;
9453 if (type
== error_mark_node
)
9456 type_was_error_mark_node
= true;
9458 /* If the entire declaration is itself tagged as deprecated then
9459 suppress reports of deprecated items. */
9460 if (type
&& TREE_DEPRECATED (type
)
9461 && deprecated_state
!= DEPRECATED_SUPPRESS
)
9462 warn_deprecated_use (type
, NULL_TREE
);
9463 if (type
&& TREE_CODE (type
) == TYPE_DECL
)
9465 typedef_decl
= type
;
9466 type
= TREE_TYPE (typedef_decl
);
9467 if (TREE_DEPRECATED (type
)
9468 && DECL_ARTIFICIAL (typedef_decl
)
9469 && deprecated_state
!= DEPRECATED_SUPPRESS
)
9470 warn_deprecated_use (type
, NULL_TREE
);
9472 /* No type at all: default to `int', and set DEFAULTED_INT
9473 because it was not a user-defined typedef. */
9474 if (type
== NULL_TREE
)
9476 if (signed_p
|| unsigned_p
|| long_p
|| short_p
)
9478 /* These imply 'int'. */
9479 type
= integer_type_node
;
9482 /* If we just have "complex", it is equivalent to "complex double". */
9483 else if (!longlong
&& !explicit_intN
9484 && decl_spec_seq_has_spec_p (declspecs
, ds_complex
))
9486 type
= double_type_node
;
9487 pedwarn (declspecs
->locations
[ds_complex
], OPT_Wpedantic
,
9488 "ISO C++ does not support plain %<complex%> meaning "
9489 "%<double complex%>");
9493 explicit_int
= declspecs
->explicit_int_p
;
9494 explicit_char
= declspecs
->explicit_char_p
;
9497 /* See the code below that used this. */
9499 decl_attr
= DECL_ATTRIBUTES (typedef_decl
);
9501 typedef_type
= type
;
9504 if (sfk
!= sfk_conversion
)
9505 ctor_return_type
= ctype
;
9507 if (sfk
!= sfk_none
)
9509 type
= check_special_function_return_type (sfk
, type
,
9512 declspecs
->locations
);
9513 type_quals
= TYPE_UNQUALIFIED
;
9515 else if (type
== NULL_TREE
)
9521 /* We handle `main' specially here, because 'main () { }' is so
9522 common. With no options, it is allowed. With -Wreturn-type,
9523 it is a warning. It is only an error with -pedantic-errors. */
9524 is_main
= (funcdef_flag
9525 && dname
&& identifier_p (dname
)
9526 && MAIN_NAME_P (dname
)
9527 && ctype
== NULL_TREE
9528 && in_namespace
== NULL_TREE
9529 && current_namespace
== global_namespace
);
9531 if (type_was_error_mark_node
)
9532 /* We've already issued an error, don't complain more. */;
9533 else if (in_system_header_at (input_location
) || flag_ms_extensions
)
9534 /* Allow it, sigh. */;
9536 permerror (input_location
, "ISO C++ forbids declaration of %qs with no type", name
);
9538 pedwarn (input_location
, OPT_Wpedantic
,
9539 "ISO C++ forbids declaration of %qs with no type", name
);
9541 warning (OPT_Wreturn_type
,
9542 "ISO C++ forbids declaration of %qs with no type", name
);
9544 if (type_was_error_mark_node
&& template_parm_flag
)
9545 /* FIXME we should be able to propagate the error_mark_node as is
9546 for other contexts too. */
9547 type
= error_mark_node
;
9549 type
= integer_type_node
;
9556 if (! int_n_enabled_p
[declspecs
->int_n_idx
])
9558 error ("%<__int%d%> is not supported by this target",
9559 int_n_data
[declspecs
->int_n_idx
].bitsize
);
9560 explicit_intN
= false;
9562 else if (pedantic
&& ! in_system_header_at (input_location
))
9563 pedwarn (input_location
, OPT_Wpedantic
,
9564 "ISO C++ does not support %<__int%d%> for %qs",
9565 int_n_data
[declspecs
->int_n_idx
].bitsize
, name
);
9568 /* Now process the modifiers that were specified
9569 and check for invalid combinations. */
9571 /* Long double is a special combination. */
9572 if (long_p
&& !longlong
&& TYPE_MAIN_VARIANT (type
) == double_type_node
)
9575 type
= cp_build_qualified_type (long_double_type_node
,
9576 cp_type_quals (type
));
9579 /* Check all other uses of type modifiers. */
9581 if (unsigned_p
|| signed_p
|| long_p
|| short_p
)
9585 if ((signed_p
|| unsigned_p
) && TREE_CODE (type
) != INTEGER_TYPE
)
9586 error ("%<signed%> or %<unsigned%> invalid for %qs", name
);
9587 else if (signed_p
&& unsigned_p
)
9588 error ("%<signed%> and %<unsigned%> specified together for %qs", name
);
9589 else if (longlong
&& TREE_CODE (type
) != INTEGER_TYPE
)
9590 error ("%<long long%> invalid for %qs", name
);
9591 else if (long_p
&& TREE_CODE (type
) == REAL_TYPE
)
9592 error ("%<long%> invalid for %qs", name
);
9593 else if (short_p
&& TREE_CODE (type
) == REAL_TYPE
)
9594 error ("%<short%> invalid for %qs", name
);
9595 else if ((long_p
|| short_p
) && TREE_CODE (type
) != INTEGER_TYPE
)
9596 error ("%<long%> or %<short%> invalid for %qs", name
);
9597 else if ((long_p
|| short_p
|| explicit_char
|| explicit_int
) && explicit_intN
)
9598 error ("%<long%>, %<int%>, %<short%>, or %<char%> invalid for %qs", name
);
9599 else if ((long_p
|| short_p
) && explicit_char
)
9600 error ("%<long%> or %<short%> specified with char for %qs", name
);
9601 else if (long_p
&& short_p
)
9602 error ("%<long%> and %<short%> specified together for %qs", name
);
9603 else if (type
== char16_type_node
|| type
== char32_type_node
)
9605 if (signed_p
|| unsigned_p
)
9606 error ("%<signed%> or %<unsigned%> invalid for %qs", name
);
9607 else if (short_p
|| long_p
)
9608 error ("%<short%> or %<long%> invalid for %qs", name
);
9613 if (!explicit_int
&& !defaulted_int
&& !explicit_char
&& !explicit_intN
&& pedantic
)
9615 pedwarn (input_location
, OPT_Wpedantic
,
9616 "long, short, signed or unsigned used invalidly for %qs",
9618 if (flag_pedantic_errors
)
9623 /* Discard the type modifiers if they are invalid. */
9634 /* Decide whether an integer type is signed or not.
9635 Optionally treat bitfields as signed by default. */
9639 It is implementation-defined whether a plain (neither
9640 explicitly signed or unsigned) char, short, int, or long
9641 bit-field is signed or unsigned.
9643 Naturally, we extend this to long long as well. Note that
9644 this does not include wchar_t. */
9645 || (bitfield
&& !flag_signed_bitfields
9647 /* A typedef for plain `int' without `signed' can be
9648 controlled just like plain `int', but a typedef for
9649 `signed int' cannot be so controlled. */
9651 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl
))
9652 && TREE_CODE (type
) == INTEGER_TYPE
9653 && !same_type_p (TYPE_MAIN_VARIANT (type
), wchar_type_node
)))
9656 type
= int_n_trees
[declspecs
->int_n_idx
].unsigned_type
;
9658 type
= long_long_unsigned_type_node
;
9660 type
= long_unsigned_type_node
;
9662 type
= short_unsigned_type_node
;
9663 else if (type
== char_type_node
)
9664 type
= unsigned_char_type_node
;
9665 else if (typedef_decl
)
9666 type
= unsigned_type_for (type
);
9668 type
= unsigned_type_node
;
9670 else if (signed_p
&& type
== char_type_node
)
9671 type
= signed_char_type_node
;
9672 else if (explicit_intN
)
9673 type
= int_n_trees
[declspecs
->int_n_idx
].signed_type
;
9675 type
= long_long_integer_type_node
;
9677 type
= long_integer_type_node
;
9679 type
= short_integer_type_node
;
9681 if (decl_spec_seq_has_spec_p (declspecs
, ds_complex
))
9683 if (TREE_CODE (type
) != INTEGER_TYPE
&& TREE_CODE (type
) != REAL_TYPE
)
9684 error ("complex invalid for %qs", name
);
9685 /* If a modifier is specified, the resulting complex is the complex
9686 form of TYPE. E.g, "complex short" is "complex short int". */
9687 else if (type
== integer_type_node
)
9688 type
= complex_integer_type_node
;
9689 else if (type
== float_type_node
)
9690 type
= complex_float_type_node
;
9691 else if (type
== double_type_node
)
9692 type
= complex_double_type_node
;
9693 else if (type
== long_double_type_node
)
9694 type
= complex_long_double_type_node
;
9696 type
= build_complex_type (type
);
9699 /* If we're using the injected-class-name to form a compound type or a
9700 declaration, replace it with the underlying class so we don't get
9701 redundant typedefs in the debug output. But if we are returning the
9702 type unchanged, leave it alone so that it's available to
9703 maybe_get_template_decl_from_type_decl. */
9704 if (CLASS_TYPE_P (type
)
9705 && DECL_SELF_REFERENCE_P (TYPE_NAME (type
))
9706 && type
== TREE_TYPE (TYPE_NAME (type
))
9707 && (declarator
|| type_quals
))
9708 type
= DECL_ORIGINAL_TYPE (TYPE_NAME (type
));
9710 type_quals
|= cp_type_quals (type
);
9711 type
= cp_build_qualified_type_real
9712 (type
, type_quals
, ((((typedef_decl
&& !DECL_ARTIFICIAL (typedef_decl
))
9713 || declspecs
->decltype_p
)
9714 ? tf_ignore_bad_quals
: 0) | tf_warning_or_error
));
9715 /* We might have ignored or rejected some of the qualifiers. */
9716 type_quals
= cp_type_quals (type
);
9719 inlinep
= decl_spec_seq_has_spec_p (declspecs
, ds_inline
);
9720 virtualp
= decl_spec_seq_has_spec_p (declspecs
, ds_virtual
);
9721 explicitp
= decl_spec_seq_has_spec_p (declspecs
, ds_explicit
);
9723 storage_class
= declspecs
->storage_class
;
9724 if (storage_class
== sc_static
)
9725 staticp
= 1 + (decl_context
== FIELD
);
9727 if (virtualp
&& staticp
== 2)
9729 error ("member %qD cannot be declared both virtual and static", dname
);
9730 storage_class
= sc_none
;
9733 friendp
= decl_spec_seq_has_spec_p (declspecs
, ds_friend
);
9735 /* Issue errors about use of storage classes for parameters. */
9736 if (decl_context
== PARM
)
9740 error ("typedef declaration invalid in parameter declaration");
9741 return error_mark_node
;
9743 else if (template_parm_flag
&& storage_class
!= sc_none
)
9745 error ("storage class specified for template parameter %qs", name
);
9746 return error_mark_node
;
9748 else if (storage_class
== sc_static
9749 || storage_class
== sc_extern
9751 error ("storage class specifiers invalid in parameter declarations");
9753 /* Function parameters cannot be concept. */
9755 error ("a parameter cannot be declared %<concept%>");
9756 /* Function parameters cannot be constexpr. If we saw one, moan
9757 and pretend it wasn't there. */
9758 else if (constexpr_p
)
9760 error ("a parameter cannot be declared %<constexpr%>");
9765 /* Give error if `virtual' is used outside of class declaration. */
9767 && (current_class_name
== NULL_TREE
|| decl_context
!= FIELD
))
9769 error_at (declspecs
->locations
[ds_virtual
],
9770 "%<virtual%> outside class declaration");
9774 /* Static anonymous unions are dealt with here. */
9775 if (staticp
&& decl_context
== TYPENAME
9777 && ANON_AGGR_TYPE_P (declspecs
->type
))
9778 decl_context
= FIELD
;
9780 /* Warn about storage classes that are invalid for certain
9781 kinds of declarations (parameters, typenames, etc.). */
9784 && storage_class
!= sc_extern
9785 && storage_class
!= sc_static
)
9788 error ("multiple storage classes in declaration of %qs", name
);
9791 if (decl_context
!= NORMAL
9792 && ((storage_class
!= sc_none
9793 && storage_class
!= sc_mutable
)
9796 if ((decl_context
== PARM
|| decl_context
== CATCHPARM
)
9797 && (storage_class
== sc_register
9798 || storage_class
== sc_auto
))
9802 else if (decl_context
== FIELD
9803 /* C++ allows static class elements. */
9804 && storage_class
== sc_static
)
9805 /* C++ also allows inlines and signed and unsigned elements,
9806 but in those cases we don't come in here. */
9810 if (decl_context
== FIELD
)
9811 error ("storage class specified for %qs", name
);
9814 if (decl_context
== PARM
|| decl_context
== CATCHPARM
)
9815 error ("storage class specified for parameter %qs", name
);
9817 error ("storage class specified for typename");
9819 if (storage_class
== sc_register
9820 || storage_class
== sc_auto
9821 || storage_class
== sc_extern
9823 storage_class
= sc_none
;
9826 else if (storage_class
== sc_extern
&& funcdef_flag
9827 && ! toplevel_bindings_p ())
9828 error ("nested function %qs declared %<extern%>", name
);
9829 else if (toplevel_bindings_p ())
9831 if (storage_class
== sc_auto
)
9832 error ("top-level declaration of %qs specifies %<auto%>", name
);
9835 && storage_class
!= sc_extern
9836 && storage_class
!= sc_static
)
9838 if (declspecs
->gnu_thread_keyword_p
)
9839 pedwarn (input_location
, 0, "function-scope %qs implicitly auto and "
9840 "declared %<__thread%>", name
);
9842 /* When thread_local is applied to a variable of block scope the
9843 storage-class-specifier static is implied if it does not appear
9845 storage_class
= declspecs
->storage_class
= sc_static
;
9849 if (storage_class
&& friendp
)
9851 error ("storage class specifiers invalid in friend function declarations");
9852 storage_class
= sc_none
;
9857 unqualified_id
= NULL_TREE
;
9860 unqualified_id
= id_declarator
->u
.id
.unqualified_name
;
9861 switch (TREE_CODE (unqualified_id
))
9864 unqualified_id
= TREE_OPERAND (unqualified_id
, 0);
9865 if (TYPE_P (unqualified_id
))
9866 unqualified_id
= constructor_name (unqualified_id
);
9869 case IDENTIFIER_NODE
:
9870 case TEMPLATE_ID_EXPR
:
9878 if (declspecs
->std_attributes
)
9880 /* Apply the c++11 attributes to the type preceding them. */
9881 input_location
= declspecs
->locations
[ds_std_attribute
];
9882 decl_attributes (&type
, declspecs
->std_attributes
, 0);
9883 input_location
= saved_loc
;
9886 /* Determine the type of the entity declared by recurring on the
9888 for (; declarator
; declarator
= declarator
->declarator
)
9890 const cp_declarator
*inner_declarator
;
9893 if (type
== error_mark_node
)
9894 return error_mark_node
;
9896 attrs
= declarator
->attributes
;
9902 if (declarator
== NULL
|| declarator
->kind
== cdk_id
)
9903 attr_flags
|= (int) ATTR_FLAG_DECL_NEXT
;
9904 if (declarator
->kind
== cdk_function
)
9905 attr_flags
|= (int) ATTR_FLAG_FUNCTION_NEXT
;
9906 if (declarator
->kind
== cdk_array
)
9907 attr_flags
|= (int) ATTR_FLAG_ARRAY_NEXT
;
9908 returned_attrs
= decl_attributes (&type
,
9909 chainon (returned_attrs
, attrs
),
9913 if (declarator
->kind
== cdk_id
)
9916 inner_declarator
= declarator
->declarator
;
9918 switch (declarator
->kind
)
9921 type
= create_array_type_for_decl (dname
, type
,
9922 declarator
->u
.array
.bounds
);
9923 if (declarator
->std_attributes
)
9926 The optional attribute-specifier-seq appertains to the
9928 returned_attrs
= chainon (returned_attrs
,
9929 declarator
->std_attributes
);
9937 /* Declaring a function type.
9938 Make sure we have a valid type for the function to return. */
9940 if (type_quals
!= TYPE_UNQUALIFIED
)
9942 if (SCALAR_TYPE_P (type
) || VOID_TYPE_P (type
))
9943 warning (OPT_Wignored_qualifiers
,
9944 "type qualifiers ignored on function return type");
9945 /* We now know that the TYPE_QUALS don't apply to the
9946 decl, but to its return type. */
9947 type_quals
= TYPE_UNQUALIFIED
;
9949 errmsg
= targetm
.invalid_return_type (type
);
9953 type
= integer_type_node
;
9956 /* Error about some types functions can't return. */
9958 if (TREE_CODE (type
) == FUNCTION_TYPE
)
9960 error ("%qs declared as function returning a function", name
);
9961 return error_mark_node
;
9963 if (TREE_CODE (type
) == ARRAY_TYPE
)
9965 error ("%qs declared as function returning an array", name
);
9966 return error_mark_node
;
9969 input_location
= declspecs
->locations
[ds_type_spec
];
9970 abstract_virtuals_error (ACU_RETURN
, type
);
9971 input_location
= saved_loc
;
9973 /* Pick up type qualifiers which should be applied to `this'. */
9974 memfn_quals
= declarator
->u
.function
.qualifiers
;
9975 /* Pick up virt-specifiers. */
9976 virt_specifiers
= declarator
->u
.function
.virt_specifiers
;
9977 /* And ref-qualifier, too */
9978 rqual
= declarator
->u
.function
.ref_qualifier
;
9979 /* Pick up the exception specifications. */
9980 raises
= declarator
->u
.function
.exception_specification
;
9981 /* If the exception-specification is ill-formed, let's pretend
9982 there wasn't one. */
9983 if (raises
== error_mark_node
)
9987 error_at (location_of (reqs
), "requires-clause on return type");
9988 reqs
= declarator
->u
.function
.requires_clause
;
9990 /* Say it's a definition only for the CALL_EXPR
9991 closest to the identifier. */
9992 funcdecl_p
= inner_declarator
&& inner_declarator
->kind
== cdk_id
;
9994 /* Handle a late-specified return type. */
9997 if (type_uses_auto (type
))
9999 if (!declarator
->u
.function
.late_return_type
)
10001 if (current_class_type
10002 && LAMBDA_TYPE_P (current_class_type
))
10003 /* OK for C++11 lambdas. */;
10004 else if (cxx_dialect
< cxx14
)
10006 error ("%qs function uses "
10007 "%<auto%> type specifier without trailing "
10008 "return type", name
);
10009 inform (input_location
, "deduced return type "
10010 "only available with -std=c++14 or "
10015 error ("virtual function cannot "
10016 "have deduced return type");
10020 else if (!is_auto (type
) && sfk
!= sfk_conversion
)
10022 error ("%qs function with trailing return type has"
10023 " %qT as its type rather than plain %<auto%>",
10025 return error_mark_node
;
10028 else if (declarator
->u
.function
.late_return_type
10029 && sfk
!= sfk_conversion
)
10031 if (cxx_dialect
< cxx11
)
10032 /* Not using maybe_warn_cpp0x because this should
10033 always be an error. */
10034 error ("trailing return type only available with "
10035 "-std=c++11 or -std=gnu++11");
10037 error ("%qs function with trailing return type not "
10038 "declared with %<auto%> type specifier", name
);
10039 return error_mark_node
;
10042 type
= splice_late_return_type
10043 (type
, declarator
->u
.function
.late_return_type
);
10044 if (type
== error_mark_node
)
10045 return error_mark_node
;
10047 if (declarator
->u
.function
.late_return_type
)
10048 late_return_type_p
= true;
10050 if (ctype
== NULL_TREE
10051 && decl_context
== FIELD
10054 ctype
= current_class_type
;
10056 if (ctype
&& (sfk
== sfk_constructor
10057 || sfk
== sfk_destructor
))
10059 /* We are within a class's scope. If our declarator name
10060 is the same as the class name, and we are defining
10061 a function, then it is a constructor/destructor, and
10062 therefore returns a void type. */
10064 /* ISO C++ 12.4/2. A destructor may not be declared
10065 const or volatile. A destructor may not be static.
10066 A destructor may not be declared with ref-qualifier.
10068 ISO C++ 12.1. A constructor may not be declared
10069 const or volatile. A constructor may not be
10070 virtual. A constructor may not be static.
10071 A constructor may not be declared with ref-qualifier. */
10073 error ((flags
== DTOR_FLAG
)
10074 ? G_("destructor cannot be static member function")
10075 : G_("constructor cannot be static member function"));
10078 error ((flags
== DTOR_FLAG
)
10079 ? G_("destructors may not be cv-qualified")
10080 : G_("constructors may not be cv-qualified"));
10081 memfn_quals
= TYPE_UNQUALIFIED
;
10086 maybe_warn_cpp0x (CPP0X_REF_QUALIFIER
);
10087 error ((flags
== DTOR_FLAG
)
10088 ? "destructors may not be ref-qualified"
10089 : "constructors may not be ref-qualified");
10090 rqual
= REF_QUAL_NONE
;
10093 if (decl_context
== FIELD
10094 && !member_function_or_else (ctype
,
10095 current_class_type
,
10097 return error_mark_node
;
10099 if (flags
!= DTOR_FLAG
)
10101 /* It's a constructor. */
10102 if (explicitp
== 1)
10106 permerror (input_location
, "constructors cannot be declared virtual");
10109 if (decl_context
== FIELD
10110 && sfk
!= sfk_constructor
)
10111 return error_mark_node
;
10113 if (decl_context
== FIELD
)
10120 /* Cannot be both friend and virtual. */
10121 error ("virtual functions cannot be friends");
10124 if (decl_context
== NORMAL
)
10125 error ("friend declaration not in class definition");
10126 if (current_function_decl
&& funcdef_flag
)
10127 error ("can%'t define friend function %qs in a local "
10128 "class definition",
10131 else if (ctype
&& sfk
== sfk_conversion
)
10133 if (explicitp
== 1)
10135 maybe_warn_cpp0x (CPP0X_EXPLICIT_CONVERSION
);
10138 if (late_return_type_p
)
10139 error ("a conversion function cannot have a trailing return type");
10142 arg_types
= grokparms (declarator
->u
.function
.parameters
,
10145 if (inner_declarator
10146 && inner_declarator
->kind
== cdk_id
10147 && inner_declarator
->u
.id
.sfk
== sfk_destructor
10148 && arg_types
!= void_list_node
)
10150 error ("destructors may not have parameters");
10151 arg_types
= void_list_node
;
10155 type
= build_function_type (type
, arg_types
);
10156 if (declarator
->std_attributes
)
10159 The optional attribute-specifier-seq appertains to
10160 the function type. */
10161 decl_attributes (&type
, declarator
->std_attributes
,
10167 case cdk_reference
:
10169 /* Filter out pointers-to-references and references-to-references.
10170 We can get these if a TYPE_DECL is used. */
10172 if (TREE_CODE (type
) == REFERENCE_TYPE
)
10174 if (declarator
->kind
!= cdk_reference
)
10176 error ("cannot declare pointer to %q#T", type
);
10177 type
= TREE_TYPE (type
);
10180 /* In C++0x, we allow reference to reference declarations
10181 that occur indirectly through typedefs [7.1.3/8 dcl.typedef]
10182 and template type arguments [14.3.1/4 temp.arg.type]. The
10183 check for direct reference to reference declarations, which
10184 are still forbidden, occurs below. Reasoning behind the change
10185 can be found in DR106, DR540, and the rvalue reference
10187 else if (cxx_dialect
== cxx98
)
10189 error ("cannot declare reference to %q#T", type
);
10190 type
= TREE_TYPE (type
);
10193 else if (VOID_TYPE_P (type
))
10195 if (declarator
->kind
== cdk_reference
)
10196 error ("cannot declare reference to %q#T", type
);
10197 else if (declarator
->kind
== cdk_ptrmem
)
10198 error ("cannot declare pointer to %q#T member", type
);
10201 /* We now know that the TYPE_QUALS don't apply to the decl,
10202 but to the target of the pointer. */
10203 type_quals
= TYPE_UNQUALIFIED
;
10205 /* This code used to handle METHOD_TYPE, but I don't think it's
10206 possible to get it here anymore. */
10207 gcc_assert (TREE_CODE (type
) != METHOD_TYPE
);
10208 if (declarator
->kind
== cdk_ptrmem
10209 && TREE_CODE (type
) == FUNCTION_TYPE
)
10211 memfn_quals
|= type_memfn_quals (type
);
10212 type
= build_memfn_type (type
,
10213 declarator
->u
.pointer
.class_type
,
10216 if (type
== error_mark_node
)
10217 return error_mark_node
;
10219 rqual
= REF_QUAL_NONE
;
10220 memfn_quals
= TYPE_UNQUALIFIED
;
10223 if (TREE_CODE (type
) == FUNCTION_TYPE
10224 && (type_memfn_quals (type
) != TYPE_UNQUALIFIED
10225 || type_memfn_rqual (type
) != REF_QUAL_NONE
))
10226 error (declarator
->kind
== cdk_reference
10227 ? G_("cannot declare reference to qualified function type %qT")
10228 : G_("cannot declare pointer to qualified function type %qT"),
10231 /* When the pointed-to type involves components of variable size,
10232 care must be taken to ensure that the size evaluation code is
10233 emitted early enough to dominate all the possible later uses
10234 and late enough for the variables on which it depends to have
10237 This is expected to happen automatically when the pointed-to
10238 type has a name/declaration of it's own, but special attention
10239 is required if the type is anonymous.
10241 We handle the NORMAL and FIELD contexts here by inserting a
10242 dummy statement that just evaluates the size at a safe point
10243 and ensures it is not deferred until e.g. within a deeper
10244 conditional context (c++/43555).
10246 We expect nothing to be needed here for PARM or TYPENAME.
10247 Evaluating the size at this point for TYPENAME would
10248 actually be incorrect, as we might be in the middle of an
10249 expression with side effects on the pointed-to type size
10250 "arguments" prior to the pointer declaration point and the
10251 size evaluation could end up prior to the side effects. */
10253 if (!TYPE_NAME (type
)
10254 && (decl_context
== NORMAL
|| decl_context
== FIELD
)
10255 && at_function_scope_p ()
10256 && variably_modified_type_p (type
, NULL_TREE
))
10257 /* Force evaluation of the SAVE_EXPR. */
10258 finish_expr_stmt (TYPE_SIZE (type
));
10260 if (declarator
->kind
== cdk_reference
)
10262 /* In C++0x, the type we are creating a reference to might be
10263 a typedef which is itself a reference type. In that case,
10264 we follow the reference collapsing rules in
10265 [7.1.3/8 dcl.typedef] to create the final reference type:
10267 "If a typedef TD names a type that is a reference to a type
10268 T, an attempt to create the type 'lvalue reference to cv TD'
10269 creates the type 'lvalue reference to T,' while an attempt
10270 to create the type "rvalue reference to cv TD' creates the
10273 if (VOID_TYPE_P (type
))
10274 /* We already gave an error. */;
10275 else if (TREE_CODE (type
) == REFERENCE_TYPE
)
10277 if (declarator
->u
.reference
.rvalue_ref
)
10278 /* Leave type alone. */;
10280 type
= cp_build_reference_type (TREE_TYPE (type
), false);
10283 type
= cp_build_reference_type
10284 (type
, declarator
->u
.reference
.rvalue_ref
);
10286 /* In C++0x, we need this check for direct reference to
10287 reference declarations, which are forbidden by
10288 [8.3.2/5 dcl.ref]. Reference to reference declarations
10289 are only allowed indirectly through typedefs and template
10290 type arguments. Example:
10292 void foo(int & &); // invalid ref-to-ref decl
10294 typedef int & int_ref;
10295 void foo(int_ref &); // valid ref-to-ref decl
10297 if (inner_declarator
&& inner_declarator
->kind
== cdk_reference
)
10298 error ("cannot declare reference to %q#T, which is not "
10299 "a typedef or a template type argument", type
);
10301 else if (TREE_CODE (type
) == METHOD_TYPE
)
10302 type
= build_ptrmemfunc_type (build_pointer_type (type
));
10303 else if (declarator
->kind
== cdk_ptrmem
)
10305 gcc_assert (TREE_CODE (declarator
->u
.pointer
.class_type
)
10306 != NAMESPACE_DECL
);
10307 if (declarator
->u
.pointer
.class_type
== error_mark_node
)
10308 /* We will already have complained. */
10309 type
= error_mark_node
;
10311 type
= build_ptrmem_type (declarator
->u
.pointer
.class_type
,
10315 type
= build_pointer_type (type
);
10317 /* Process a list of type modifier keywords (such as
10318 const or volatile) that were given inside the `*' or `&'. */
10320 if (declarator
->u
.pointer
.qualifiers
)
10323 = cp_build_qualified_type (type
,
10324 declarator
->u
.pointer
.qualifiers
);
10325 type_quals
= cp_type_quals (type
);
10328 /* Apply C++11 attributes to the pointer, and not to the
10329 type pointed to. This is unlike what is done for GNU
10330 attributes above. It is to comply with [dcl.ptr]/1:
10332 [the optional attribute-specifier-seq (7.6.1) appertains
10333 to the pointer and not to the object pointed to]. */
10334 if (declarator
->std_attributes
)
10335 decl_attributes (&type
, declarator
->std_attributes
,
10345 gcc_unreachable ();
10349 /* A `constexpr' specifier used in an object declaration declares
10350 the object as `const'. */
10351 if (constexpr_p
&& innermost_code
!= cdk_function
)
10353 /* DR1688 says that a `constexpr' specifier in combination with
10354 `volatile' is valid. */
10356 if (TREE_CODE (type
) != REFERENCE_TYPE
)
10358 type_quals
|= TYPE_QUAL_CONST
;
10359 type
= cp_build_qualified_type (type
, type_quals
);
10363 if (unqualified_id
&& TREE_CODE (unqualified_id
) == TEMPLATE_ID_EXPR
10364 && TREE_CODE (type
) != FUNCTION_TYPE
10365 && TREE_CODE (type
) != METHOD_TYPE
10366 && !variable_template_p (TREE_OPERAND (unqualified_id
, 0)))
10368 error ("template-id %qD used as a declarator",
10370 unqualified_id
= dname
;
10373 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
10374 qualified with a class-name, turn it into a METHOD_TYPE, unless
10375 we know that the function is static. We take advantage of this
10376 opportunity to do other processing that pertains to entities
10377 explicitly declared to be class members. Note that if DECLARATOR
10378 is non-NULL, we know it is a cdk_id declarator; otherwise, we
10379 would not have exited the loop above. */
10381 && declarator
->u
.id
.qualifying_scope
10382 && MAYBE_CLASS_TYPE_P (declarator
->u
.id
.qualifying_scope
))
10384 ctype
= declarator
->u
.id
.qualifying_scope
;
10385 ctype
= TYPE_MAIN_VARIANT (ctype
);
10386 template_count
= num_template_headers_for_class (ctype
);
10388 if (ctype
== current_class_type
)
10392 permerror (input_location
, "member functions are implicitly friends of their class");
10396 permerror (declarator
->id_loc
,
10397 "extra qualification %<%T::%> on member %qs",
10400 else if (/* If the qualifying type is already complete, then we
10401 can skip the following checks. */
10402 !COMPLETE_TYPE_P (ctype
)
10403 && (/* If the function is being defined, then
10404 qualifying type must certainly be complete. */
10406 /* A friend declaration of "T::f" is OK, even if
10407 "T" is a template parameter. But, if this
10408 function is not a friend, the qualifying type
10409 must be a class. */
10410 || (!friendp
&& !CLASS_TYPE_P (ctype
))
10411 /* For a declaration, the type need not be
10412 complete, if either it is dependent (since there
10413 is no meaningful definition of complete in that
10414 case) or the qualifying class is currently being
10416 || !(dependent_type_p (ctype
)
10417 || currently_open_class (ctype
)))
10418 /* Check that the qualifying type is complete. */
10419 && !complete_type_or_else (ctype
, NULL_TREE
))
10420 return error_mark_node
;
10421 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
10423 if (current_class_type
10424 && (!friendp
|| funcdef_flag
))
10426 error (funcdef_flag
10427 ? G_("cannot define member function %<%T::%s%> "
10429 : G_("cannot declare member function %<%T::%s%> "
10431 ctype
, name
, current_class_type
);
10432 return error_mark_node
;
10435 else if (typedef_p
&& current_class_type
)
10437 error ("cannot declare member %<%T::%s%> within %qT",
10438 ctype
, name
, current_class_type
);
10439 return error_mark_node
;
10443 if (ctype
== NULL_TREE
&& decl_context
== FIELD
&& friendp
== 0)
10444 ctype
= current_class_type
;
10446 /* Now TYPE has the actual type. */
10448 if (returned_attrs
)
10451 *attrlist
= chainon (returned_attrs
, *attrlist
);
10453 attrlist
= &returned_attrs
;
10457 && declarator
->kind
== cdk_id
10458 && declarator
->std_attributes
)
10459 /* [dcl.meaning]/1: The optional attribute-specifier-seq following
10460 a declarator-id appertains to the entity that is declared. */
10461 *attrlist
= chainon (*attrlist
, declarator
->std_attributes
);
10463 /* Handle parameter packs. */
10464 if (parameter_pack_p
)
10466 if (decl_context
== PARM
)
10467 /* Turn the type into a pack expansion.*/
10468 type
= make_pack_expansion (type
);
10470 error ("non-parameter %qs cannot be a parameter pack", name
);
10473 /* Did array size calculations overflow or does the array cover more
10474 than half of the address-space? */
10475 if (TREE_CODE (type
) == ARRAY_TYPE
10476 && COMPLETE_TYPE_P (type
)
10477 && TREE_CODE (TYPE_SIZE_UNIT (type
)) == INTEGER_CST
10478 && ! valid_constant_size_p (TYPE_SIZE_UNIT (type
)))
10480 error ("size of array %qs is too large", name
);
10481 /* If we proceed with the array type as it is, we'll eventually
10482 crash in tree_to_[su]hwi(). */
10483 type
= error_mark_node
;
10486 if ((decl_context
== FIELD
|| decl_context
== PARM
)
10487 && !processing_template_decl
10488 && variably_modified_type_p (type
, NULL_TREE
))
10490 if (decl_context
== FIELD
)
10491 error ("data member may not have variably modified type %qT", type
);
10493 error ("parameter may not have variably modified type %qT", type
);
10494 type
= error_mark_node
;
10497 if (explicitp
== 1 || (explicitp
&& friendp
))
10499 /* [dcl.fct.spec] (C++11) The explicit specifier shall be used only
10500 in the declaration of a constructor or conversion function within
10501 a class definition. */
10502 if (!current_class_type
)
10503 error_at (declspecs
->locations
[ds_explicit
],
10504 "%<explicit%> outside class declaration");
10506 error_at (declspecs
->locations
[ds_explicit
],
10507 "%<explicit%> in friend declaration");
10509 error_at (declspecs
->locations
[ds_explicit
],
10510 "only declarations of constructors and conversion operators "
10511 "can be %<explicit%>");
10515 if (storage_class
== sc_mutable
)
10517 if (decl_context
!= FIELD
|| friendp
)
10519 error ("non-member %qs cannot be declared %<mutable%>", name
);
10520 storage_class
= sc_none
;
10522 else if (decl_context
== TYPENAME
|| typedef_p
)
10524 error ("non-object member %qs cannot be declared %<mutable%>", name
);
10525 storage_class
= sc_none
;
10527 else if (TREE_CODE (type
) == FUNCTION_TYPE
10528 || TREE_CODE (type
) == METHOD_TYPE
)
10530 error ("function %qs cannot be declared %<mutable%>", name
);
10531 storage_class
= sc_none
;
10535 error ("static %qs cannot be declared %<mutable%>", name
);
10536 storage_class
= sc_none
;
10538 else if (type_quals
& TYPE_QUAL_CONST
)
10540 error ("const %qs cannot be declared %<mutable%>", name
);
10541 storage_class
= sc_none
;
10543 else if (TREE_CODE (type
) == REFERENCE_TYPE
)
10545 permerror (input_location
, "reference %qs cannot be declared "
10546 "%<mutable%>", name
);
10547 storage_class
= sc_none
;
10551 /* If this is declaring a typedef name, return a TYPE_DECL. */
10552 if (typedef_p
&& decl_context
!= TYPENAME
)
10556 /* Note that the grammar rejects storage classes
10557 in typenames, fields or parameters. */
10558 if (current_lang_name
== lang_name_java
)
10559 TYPE_FOR_JAVA (type
) = 1;
10561 /* This declaration:
10563 typedef void f(int) const;
10565 declares a function type which is not a member of any
10566 particular class, but which is cv-qualified; for
10567 example "f S::*" declares a pointer to a const-qualified
10568 member function of S. We record the cv-qualification in the
10570 if ((rqual
|| memfn_quals
) && TREE_CODE (type
) == FUNCTION_TYPE
)
10572 type
= apply_memfn_quals (type
, memfn_quals
, rqual
);
10574 /* We have now dealt with these qualifiers. */
10575 memfn_quals
= TYPE_UNQUALIFIED
;
10576 rqual
= REF_QUAL_NONE
;
10579 if (type_uses_auto (type
))
10581 error ("typedef declared %<auto%>");
10582 type
= error_mark_node
;
10586 error_at (location_of (reqs
), "requires-clause on typedef");
10588 if (decl_context
== FIELD
)
10589 decl
= build_lang_decl (TYPE_DECL
, unqualified_id
, type
);
10591 decl
= build_decl (input_location
, TYPE_DECL
, unqualified_id
, type
);
10592 if (id_declarator
&& declarator
->u
.id
.qualifying_scope
) {
10593 error_at (DECL_SOURCE_LOCATION (decl
),
10594 "typedef name may not be a nested-name-specifier");
10595 TREE_TYPE (decl
) = error_mark_node
;
10598 if (decl_context
!= FIELD
)
10600 if (!current_function_decl
)
10601 DECL_CONTEXT (decl
) = FROB_CONTEXT (current_namespace
);
10602 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (current_function_decl
)
10603 || (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P
10604 (current_function_decl
)))
10605 /* The TYPE_DECL is "abstract" because there will be
10606 clones of this constructor/destructor, and there will
10607 be copies of this TYPE_DECL generated in those
10608 clones. The decloning optimization (for space) may
10609 revert this subsequently if it determines that
10610 the clones should share a common implementation. */
10611 DECL_ABSTRACT_P (decl
) = true;
10613 else if (current_class_type
10614 && constructor_name_p (unqualified_id
, current_class_type
))
10615 permerror (input_location
, "ISO C++ forbids nested type %qD with same name "
10616 "as enclosing class",
10619 /* If the user declares "typedef struct {...} foo" then the
10620 struct will have an anonymous name. Fill that name in now.
10621 Nothing can refer to it, so nothing needs know about the name
10623 if (type
!= error_mark_node
10625 && TYPE_NAME (type
)
10626 && TREE_CODE (TYPE_NAME (type
)) == TYPE_DECL
10627 && TYPE_ANONYMOUS_P (type
)
10628 && declspecs
->type_definition_p
10629 && attributes_naming_typedef_ok (*attrlist
)
10630 && cp_type_quals (type
) == TYPE_UNQUALIFIED
)
10634 /* Replace the anonymous name with the real name everywhere. */
10635 for (t
= TYPE_MAIN_VARIANT (type
); t
; t
= TYPE_NEXT_VARIANT (t
))
10637 if (anon_aggrname_p (TYPE_IDENTIFIER (t
)))
10638 /* We do not rename the debug info representing the
10639 anonymous tagged type because the standard says in
10640 [dcl.typedef] that the naming applies only for
10641 linkage purposes. */
10642 /*debug_hooks->set_name (t, decl);*/
10643 TYPE_NAME (t
) = decl
;
10646 if (TYPE_LANG_SPECIFIC (type
))
10647 TYPE_WAS_ANONYMOUS (type
) = 1;
10649 /* If this is a typedef within a template class, the nested
10650 type is a (non-primary) template. The name for the
10651 template needs updating as well. */
10652 if (TYPE_LANG_SPECIFIC (type
) && CLASSTYPE_TEMPLATE_INFO (type
))
10653 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type
))
10654 = TYPE_IDENTIFIER (type
);
10656 /* Adjust linkage now that we aren't anonymous anymore. */
10657 reset_type_linkage (type
);
10659 /* FIXME remangle member functions; member functions of a
10660 type with external linkage have external linkage. */
10664 || (typedef_decl
&& C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl
)))
10665 C_TYPEDEF_EXPLICITLY_SIGNED (decl
) = 1;
10667 bad_specifiers (decl
, BSP_TYPE
, virtualp
,
10668 memfn_quals
!= TYPE_UNQUALIFIED
,
10669 inlinep
, friendp
, raises
!= NULL_TREE
);
10671 if (decl_spec_seq_has_spec_p (declspecs
, ds_alias
))
10672 /* Acknowledge that this was written:
10673 `using analias = atype;'. */
10674 TYPE_DECL_ALIAS_P (decl
) = 1;
10679 /* Detect the case of an array type of unspecified size
10680 which came, as such, direct from a typedef name.
10681 We must copy the type, so that the array's domain can be
10682 individually set by the object's initializer. */
10684 if (type
&& typedef_type
10685 && TREE_CODE (type
) == ARRAY_TYPE
&& !TYPE_DOMAIN (type
)
10686 && TYPE_MAIN_VARIANT (type
) == TYPE_MAIN_VARIANT (typedef_type
))
10687 type
= build_cplus_array_type (TREE_TYPE (type
), NULL_TREE
);
10689 /* Detect where we're using a typedef of function type to declare a
10690 function. PARMS will not be set, so we must create it now. */
10692 if (type
== typedef_type
&& TREE_CODE (type
) == FUNCTION_TYPE
)
10694 tree decls
= NULL_TREE
;
10697 for (args
= TYPE_ARG_TYPES (type
);
10698 args
&& args
!= void_list_node
;
10699 args
= TREE_CHAIN (args
))
10701 tree decl
= cp_build_parm_decl (NULL_TREE
, TREE_VALUE (args
));
10703 DECL_CHAIN (decl
) = decls
;
10707 parms
= nreverse (decls
);
10709 if (decl_context
!= TYPENAME
)
10711 /* The qualifiers on the function type become the qualifiers on
10712 the non-static member function. */
10713 memfn_quals
|= type_memfn_quals (type
);
10714 rqual
= type_memfn_rqual (type
);
10715 type_quals
= TYPE_UNQUALIFIED
;
10719 /* If this is a type name (such as, in a cast or sizeof),
10720 compute the type and return it now. */
10722 if (decl_context
== TYPENAME
)
10724 /* Note that here we don't care about type_quals. */
10726 /* Special case: "friend class foo" looks like a TYPENAME context. */
10731 error ("%<inline%> specified for friend class declaration");
10737 /* Don't allow friend declaration without a class-key. */
10738 if (TREE_CODE (type
) == TEMPLATE_TYPE_PARM
)
10739 permerror (input_location
, "template parameters cannot be friends");
10740 else if (TREE_CODE (type
) == TYPENAME_TYPE
)
10741 permerror (input_location
, "friend declaration requires class-key, "
10742 "i.e. %<friend class %T::%D%>",
10743 TYPE_CONTEXT (type
), TYPENAME_TYPE_FULLNAME (type
));
10745 permerror (input_location
, "friend declaration requires class-key, "
10746 "i.e. %<friend %#T%>",
10750 /* Only try to do this stuff if we didn't already give up. */
10751 if (type
!= integer_type_node
)
10753 /* A friendly class? */
10754 if (current_class_type
)
10755 make_friend_class (current_class_type
, TYPE_MAIN_VARIANT (type
),
10756 /*complain=*/true);
10758 error ("trying to make class %qT a friend of global scope",
10761 type
= void_type_node
;
10764 else if (memfn_quals
|| rqual
)
10766 if (ctype
== NULL_TREE
10767 && TREE_CODE (type
) == METHOD_TYPE
)
10768 ctype
= TYPE_METHOD_BASETYPE (type
);
10771 type
= build_memfn_type (type
, ctype
, memfn_quals
, rqual
);
10772 /* Core issue #547: need to allow this in template type args.
10773 Allow it in general in C++11 for alias-declarations. */
10774 else if ((template_type_arg
|| cxx_dialect
>= cxx11
)
10775 && TREE_CODE (type
) == FUNCTION_TYPE
)
10776 type
= apply_memfn_quals (type
, memfn_quals
, rqual
);
10778 error ("invalid qualifiers on non-member function type");
10782 error_at (location_of (reqs
), "requires-clause on type-id");
10786 else if (unqualified_id
== NULL_TREE
&& decl_context
!= PARM
10787 && decl_context
!= CATCHPARM
10788 && TREE_CODE (type
) != UNION_TYPE
10791 error ("abstract declarator %qT used as declaration", type
);
10792 return error_mark_node
;
10795 /* Only functions may be declared using an operator-function-id. */
10797 && IDENTIFIER_OPNAME_P (unqualified_id
)
10798 && TREE_CODE (type
) != FUNCTION_TYPE
10799 && TREE_CODE (type
) != METHOD_TYPE
)
10801 error ("declaration of %qD as non-function", unqualified_id
);
10802 return error_mark_node
;
10806 && TREE_CODE (type
) != FUNCTION_TYPE
10807 && TREE_CODE (type
) != METHOD_TYPE
)
10808 error_at (location_of (reqs
),
10809 "requires-clause on declaration of non-function type %qT",
10812 /* We don't check parameter types here because we can emit a better
10813 error message later. */
10814 if (decl_context
!= PARM
)
10816 type
= check_var_type (unqualified_id
, type
);
10817 if (type
== error_mark_node
)
10818 return error_mark_node
;
10821 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
10822 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
10824 if (decl_context
== PARM
|| decl_context
== CATCHPARM
)
10826 if (ctype
|| in_namespace
)
10827 error ("cannot use %<::%> in parameter declaration");
10829 if (type_uses_auto (type
))
10831 if (cxx_dialect
>= cxx14
)
10832 error ("%<auto%> parameter not permitted in this context");
10834 error ("parameter declared %<auto%>");
10835 type
= error_mark_node
;
10838 /* A parameter declared as an array of T is really a pointer to T.
10839 One declared as a function is really a pointer to a function.
10840 One declared as a member is really a pointer to member. */
10842 if (TREE_CODE (type
) == ARRAY_TYPE
)
10844 /* Transfer const-ness of array into that of type pointed to. */
10845 type
= build_pointer_type (TREE_TYPE (type
));
10846 type_quals
= TYPE_UNQUALIFIED
;
10847 array_parameter_p
= true;
10849 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
10850 type
= build_pointer_type (type
);
10853 if (ctype
&& TREE_CODE (type
) == FUNCTION_TYPE
&& staticp
< 2
10854 && !NEW_DELETE_OPNAME_P (unqualified_id
))
10856 cp_cv_quals real_quals
= memfn_quals
;
10857 if (cxx_dialect
< cxx14
&& constexpr_p
10858 && sfk
!= sfk_constructor
&& sfk
!= sfk_destructor
)
10859 real_quals
|= TYPE_QUAL_CONST
;
10860 type
= build_memfn_type (type
, ctype
, real_quals
, rqual
);
10866 if (decl_context
== PARM
)
10868 decl
= cp_build_parm_decl (unqualified_id
, type
);
10869 DECL_ARRAY_PARAMETER_P (decl
) = array_parameter_p
;
10871 bad_specifiers (decl
, BSP_PARM
, virtualp
,
10872 memfn_quals
!= TYPE_UNQUALIFIED
,
10873 inlinep
, friendp
, raises
!= NULL_TREE
);
10875 else if (decl_context
== FIELD
)
10877 if (!staticp
&& !friendp
&& TREE_CODE (type
) != METHOD_TYPE
10878 && type_uses_auto (type
))
10880 error ("non-static data member declared %<auto%>");
10881 type
= error_mark_node
;
10884 /* The C99 flexible array extension. */
10885 if (!staticp
&& TREE_CODE (type
) == ARRAY_TYPE
10886 && TYPE_DOMAIN (type
) == NULL_TREE
)
10888 tree itype
= compute_array_index_type (dname
, integer_zero_node
,
10889 tf_warning_or_error
);
10890 type
= build_cplus_array_type (TREE_TYPE (type
), itype
);
10893 if (type
== error_mark_node
)
10895 /* Happens when declaring arrays of sizes which
10896 are error_mark_node, for example. */
10899 else if (in_namespace
&& !friendp
)
10901 /* Something like struct S { int N::j; }; */
10902 error ("invalid use of %<::%>");
10903 return error_mark_node
;
10905 else if (TREE_CODE (type
) == FUNCTION_TYPE
10906 || TREE_CODE (type
) == METHOD_TYPE
)
10909 tree function_context
;
10913 /* This should never happen in pure C++ (the check
10914 could be an assert). It could happen in
10915 Objective-C++ if someone writes invalid code that
10916 uses a function declaration for an instance
10917 variable or property (instance variables and
10918 properties are parsed as FIELD_DECLs, but they are
10919 part of an Objective-C class, not a C++ class).
10920 That code is invalid and is caught by this
10924 error ("declaration of function %qD in invalid context",
10926 return error_mark_node
;
10929 /* ``A union may [ ... ] not [ have ] virtual functions.''
10931 if (virtualp
&& TREE_CODE (ctype
) == UNION_TYPE
)
10933 error ("function %qD declared virtual inside a union",
10935 return error_mark_node
;
10938 if (NEW_DELETE_OPNAME_P (unqualified_id
))
10942 error ("%qD cannot be declared virtual, since it "
10943 "is always static",
10950 /* Check that the name used for a destructor makes sense. */
10951 if (sfk
== sfk_destructor
)
10953 tree uqname
= id_declarator
->u
.id
.unqualified_name
;
10957 gcc_assert (friendp
);
10958 error ("expected qualified name in friend declaration "
10959 "for destructor %qD", uqname
);
10960 return error_mark_node
;
10963 if (!check_dtor_name (ctype
, TREE_OPERAND (uqname
, 0)))
10965 error ("declaration of %qD as member of %qT",
10967 return error_mark_node
;
10971 error ("a destructor cannot be %<concept%>");
10972 return error_mark_node
;
10976 error ("a destructor cannot be %<constexpr%>");
10977 return error_mark_node
;
10980 else if (sfk
== sfk_constructor
&& friendp
&& !ctype
)
10982 error ("expected qualified name in friend declaration "
10983 "for constructor %qD",
10984 id_declarator
->u
.id
.unqualified_name
);
10985 return error_mark_node
;
10987 if (sfk
== sfk_constructor
)
10990 error ("a constructor cannot be %<concept%>");
10991 return error_mark_node
;
10995 error ("a concept cannot be a member function");
10999 if (TREE_CODE (unqualified_id
) == TEMPLATE_ID_EXPR
)
11001 tree tmpl
= TREE_OPERAND (unqualified_id
, 0);
11002 if (variable_template_p (tmpl
))
11004 error ("specialization of variable template %qD "
11005 "declared as function", tmpl
);
11006 inform (DECL_SOURCE_LOCATION (tmpl
),
11007 "variable template declared here");
11008 return error_mark_node
;
11012 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
11013 function_context
= (ctype
!= NULL_TREE
) ?
11014 decl_function_context (TYPE_MAIN_DECL (ctype
)) : NULL_TREE
;
11015 publicp
= (! friendp
|| ! staticp
)
11016 && function_context
== NULL_TREE
;
11018 if (late_return_type_p
)
11019 TYPE_HAS_LATE_RETURN_TYPE (type
) = 1;
11021 decl
= grokfndecl (ctype
, type
,
11022 TREE_CODE (unqualified_id
) != TEMPLATE_ID_EXPR
11023 ? unqualified_id
: dname
,
11027 virtualp
, flags
, memfn_quals
, rqual
, raises
,
11028 friendp
? -1 : 0, friendp
, publicp
,
11029 inlinep
| (2 * constexpr_p
) | (4 * concept_p
),
11030 initialized
== SD_DELETED
, sfk
,
11031 funcdef_flag
, template_count
, in_namespace
,
11032 attrlist
, declarator
->id_loc
);
11033 decl
= set_virt_specifiers (decl
, virt_specifiers
);
11034 if (decl
== NULL_TREE
)
11035 return error_mark_node
;
11037 /* This clobbers the attrs stored in `decl' from `attrlist'. */
11038 /* The decl and setting of decl_attr is also turned off. */
11039 decl
= build_decl_attribute_variant (decl
, decl_attr
);
11042 /* [class.conv.ctor]
11044 A constructor declared without the function-specifier
11045 explicit that can be called with a single parameter
11046 specifies a conversion from the type of its first
11047 parameter to the type of its class. Such a constructor
11048 is called a converting constructor. */
11049 if (explicitp
== 2)
11050 DECL_NONCONVERTING_P (decl
) = 1;
11052 else if (!staticp
&& !dependent_type_p (type
)
11053 && !COMPLETE_TYPE_P (complete_type (type
))
11054 && (TREE_CODE (type
) != ARRAY_TYPE
11055 || !COMPLETE_TYPE_P (TREE_TYPE (type
))
11056 || initialized
== 0))
11058 if (unqualified_id
)
11060 error ("field %qD has incomplete type %qT",
11061 unqualified_id
, type
);
11062 cxx_incomplete_type_inform (strip_array_types (type
));
11065 error ("name %qT has incomplete type", type
);
11067 type
= error_mark_node
;
11074 error ("%qE is neither function nor member function; "
11075 "cannot be declared friend", unqualified_id
);
11083 /* Friends are treated specially. */
11084 if (ctype
== current_class_type
)
11085 ; /* We already issued a permerror. */
11086 else if (decl
&& DECL_NAME (decl
))
11088 if (template_class_depth (current_class_type
) == 0)
11090 decl
= check_explicit_specialization
11091 (unqualified_id
, decl
, template_count
,
11092 2 * funcdef_flag
+ 4);
11093 if (decl
== error_mark_node
)
11094 return error_mark_node
;
11097 decl
= do_friend (ctype
, unqualified_id
, decl
,
11103 return error_mark_node
;
11106 /* Structure field. It may not be a function, except for C++. */
11108 if (decl
== NULL_TREE
)
11112 /* C++ allows static class members. All other work
11113 for this is done by grokfield. */
11114 decl
= build_lang_decl_loc (declarator
11115 ? declarator
->id_loc
11117 VAR_DECL
, unqualified_id
, type
);
11118 set_linkage_for_static_data_member (decl
);
11119 /* Even if there is an in-class initialization, DECL
11120 is considered undefined until an out-of-class
11121 definition is provided. */
11122 DECL_EXTERNAL (decl
) = 1;
11126 CP_DECL_THREAD_LOCAL_P (decl
) = true;
11127 if (!processing_template_decl
)
11128 set_decl_tls_model (decl
, decl_default_tls_model (decl
));
11129 if (declspecs
->gnu_thread_keyword_p
)
11130 SET_DECL_GNU_TLS_P (decl
);
11133 error ("static data member %qE declared %<concept%>",
11135 else if (constexpr_p
&& !initialized
)
11137 error ("constexpr static data member %qD must have an "
11138 "initializer", decl
);
11139 constexpr_p
= false;
11145 error ("non-static data member %qE declared %<concept%>",
11147 else if (constexpr_p
)
11149 error ("non-static data member %qE declared %<constexpr%>",
11151 constexpr_p
= false;
11153 decl
= build_decl (input_location
,
11154 FIELD_DECL
, unqualified_id
, type
);
11155 DECL_NONADDRESSABLE_P (decl
) = bitfield
;
11156 if (bitfield
&& !unqualified_id
)
11157 TREE_NO_WARNING (decl
) = 1;
11159 if (storage_class
== sc_mutable
)
11161 DECL_MUTABLE_P (decl
) = 1;
11162 storage_class
= sc_none
;
11167 /* An attempt is being made to initialize a non-static
11168 member. This is new in C++11. */
11169 maybe_warn_cpp0x (CPP0X_NSDMI
);
11171 /* If this has been parsed with static storage class, but
11172 errors forced staticp to be cleared, ensure NSDMI is
11174 if (declspecs
->storage_class
== sc_static
)
11175 DECL_INITIAL (decl
) = error_mark_node
;
11179 bad_specifiers (decl
, BSP_FIELD
, virtualp
,
11180 memfn_quals
!= TYPE_UNQUALIFIED
,
11181 inlinep
, friendp
, raises
!= NULL_TREE
);
11184 else if (TREE_CODE (type
) == FUNCTION_TYPE
11185 || TREE_CODE (type
) == METHOD_TYPE
)
11187 tree original_name
;
11190 if (!unqualified_id
)
11191 return error_mark_node
;
11193 if (TREE_CODE (unqualified_id
) == TEMPLATE_ID_EXPR
)
11194 original_name
= dname
;
11196 original_name
= unqualified_id
;
11198 if (storage_class
== sc_auto
)
11199 error ("storage class %<auto%> invalid for function %qs", name
);
11200 else if (storage_class
== sc_register
)
11201 error ("storage class %<register%> invalid for function %qs", name
);
11204 if (declspecs
->gnu_thread_keyword_p
)
11205 error ("storage class %<__thread%> invalid for function %qs",
11208 error ("storage class %<thread_local%> invalid for function %qs",
11212 if (virt_specifiers
)
11213 error ("virt-specifiers in %qs not allowed outside a class definition", name
);
11214 /* Function declaration not at top level.
11215 Storage classes other than `extern' are not allowed
11216 and `extern' makes no difference. */
11217 if (! toplevel_bindings_p ()
11218 && (storage_class
== sc_static
11219 || decl_spec_seq_has_spec_p (declspecs
, ds_inline
))
11222 if (storage_class
== sc_static
)
11223 pedwarn (input_location
, OPT_Wpedantic
,
11224 "%<static%> specified invalid for function %qs "
11225 "declared out of global scope", name
);
11227 pedwarn (input_location
, OPT_Wpedantic
,
11228 "%<inline%> specifier invalid for function %qs "
11229 "declared out of global scope", name
);
11232 if (ctype
== NULL_TREE
)
11236 error ("virtual non-class function %qs", name
);
11239 else if (sfk
== sfk_constructor
11240 || sfk
== sfk_destructor
)
11242 error (funcdef_flag
11243 ? G_("%qs defined in a non-class scope")
11244 : G_("%qs declared in a non-class scope"), name
);
11249 /* Record whether the function is public. */
11250 publicp
= (ctype
!= NULL_TREE
11251 || storage_class
!= sc_static
);
11253 if (late_return_type_p
)
11254 TYPE_HAS_LATE_RETURN_TYPE (type
) = 1;
11256 decl
= grokfndecl (ctype
, type
, original_name
, parms
, unqualified_id
,
11257 reqs
, virtualp
, flags
, memfn_quals
, rqual
, raises
,
11260 inlinep
| (2 * constexpr_p
) | (4 * concept_p
),
11261 initialized
== SD_DELETED
,
11264 template_count
, in_namespace
, attrlist
,
11265 declarator
->id_loc
);
11266 if (decl
== NULL_TREE
)
11267 return error_mark_node
;
11271 int invalid_static
= 0;
11273 /* Don't allow a static member function in a class, and forbid
11274 declaring main to be static. */
11275 if (TREE_CODE (type
) == METHOD_TYPE
)
11277 permerror (input_location
, "cannot declare member function %qD to have "
11278 "static linkage", decl
);
11279 invalid_static
= 1;
11281 else if (current_function_decl
)
11283 /* FIXME need arm citation */
11284 error ("cannot declare static function inside another function");
11285 invalid_static
= 1;
11288 if (invalid_static
)
11291 storage_class
= sc_none
;
11297 /* It's a variable. */
11299 /* An uninitialized decl with `extern' is a reference. */
11300 decl
= grokvardecl (type
, dname
, unqualified_id
,
11303 ((type_quals
& TYPE_QUAL_CONST
) != 0) | (2 * concept_p
),
11305 ctype
? ctype
: in_namespace
);
11306 if (decl
== NULL_TREE
)
11307 return error_mark_node
;
11309 bad_specifiers (decl
, BSP_VAR
, virtualp
,
11310 memfn_quals
!= TYPE_UNQUALIFIED
,
11311 inlinep
, friendp
, raises
!= NULL_TREE
);
11315 DECL_CONTEXT (decl
) = ctype
;
11318 permerror (input_location
, "%<static%> may not be used when defining "
11319 "(as opposed to declaring) a static data member");
11321 storage_class
= sc_none
;
11323 if (storage_class
== sc_register
&& TREE_STATIC (decl
))
11325 error ("static member %qD declared %<register%>", decl
);
11326 storage_class
= sc_none
;
11328 if (storage_class
== sc_extern
&& pedantic
)
11330 pedwarn (input_location
, OPT_Wpedantic
,
11331 "cannot explicitly declare member %q#D to have "
11332 "extern linkage", decl
);
11333 storage_class
= sc_none
;
11336 else if (constexpr_p
&& DECL_EXTERNAL (decl
))
11338 error ("declaration of constexpr variable %qD is not a definition",
11340 constexpr_p
= false;
11344 if (storage_class
== sc_extern
&& initialized
&& !funcdef_flag
)
11346 if (toplevel_bindings_p ())
11348 /* It's common practice (and completely valid) to have a const
11349 be initialized and declared extern. */
11350 if (!(type_quals
& TYPE_QUAL_CONST
))
11351 warning (0, "%qs initialized and declared %<extern%>", name
);
11355 error ("%qs has both %<extern%> and initializer", name
);
11356 return error_mark_node
;
11360 /* Record `register' declaration for warnings on &
11361 and in case doing stupid register allocation. */
11363 if (storage_class
== sc_register
)
11364 DECL_REGISTER (decl
) = 1;
11365 else if (storage_class
== sc_extern
)
11366 DECL_THIS_EXTERN (decl
) = 1;
11367 else if (storage_class
== sc_static
)
11368 DECL_THIS_STATIC (decl
) = 1;
11370 /* Set constexpr flag on vars (functions got it in grokfndecl). */
11371 if (constexpr_p
&& VAR_P (decl
))
11372 DECL_DECLARED_CONSTEXPR_P (decl
) = true;
11374 /* Record constancy and volatility on the DECL itself . There's
11375 no need to do this when processing a template; we'll do this
11376 for the instantiated declaration based on the type of DECL. */
11377 if (!processing_template_decl
)
11378 cp_apply_type_quals_to_decl (type_quals
, decl
);
11384 /* Subroutine of start_function. Ensure that each of the parameter
11385 types (as listed in PARMS) is complete, as is required for a
11386 function definition. */
11389 require_complete_types_for_parms (tree parms
)
11391 for (; parms
; parms
= DECL_CHAIN (parms
))
11393 if (dependent_type_p (TREE_TYPE (parms
)))
11395 if (!VOID_TYPE_P (TREE_TYPE (parms
))
11396 && complete_type_or_else (TREE_TYPE (parms
), parms
))
11398 relayout_decl (parms
);
11399 DECL_ARG_TYPE (parms
) = type_passed_as (TREE_TYPE (parms
));
11402 /* grokparms or complete_type_or_else will have already issued
11404 TREE_TYPE (parms
) = error_mark_node
;
11408 /* Returns nonzero if T is a local variable. */
11411 local_variable_p (const_tree t
)
11414 /* A VAR_DECL with a context that is a _TYPE is a static data
11416 && !TYPE_P (CP_DECL_CONTEXT (t
))
11417 /* Any other non-local variable must be at namespace scope. */
11418 && !DECL_NAMESPACE_SCOPE_P (t
))
11419 || (TREE_CODE (t
) == PARM_DECL
))
11425 /* Like local_variable_p, but suitable for use as a tree-walking
11429 local_variable_p_walkfn (tree
*tp
, int *walk_subtrees
,
11432 if (local_variable_p (*tp
)
11433 && (!DECL_ARTIFICIAL (*tp
) || DECL_NAME (*tp
) == this_identifier
))
11435 else if (TYPE_P (*tp
))
11436 *walk_subtrees
= 0;
11441 /* Check that ARG, which is a default-argument expression for a
11442 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
11443 something goes wrong. DECL may also be a _TYPE node, rather than a
11444 DECL, if there is no DECL available. */
11447 check_default_argument (tree decl
, tree arg
, tsubst_flags_t complain
)
11452 if (TREE_CODE (arg
) == DEFAULT_ARG
)
11453 /* We get a DEFAULT_ARG when looking at an in-class declaration
11454 with a default argument. Ignore the argument for now; we'll
11455 deal with it after the class is complete. */
11464 decl_type
= TREE_TYPE (decl
);
11466 if (arg
== error_mark_node
11467 || decl
== error_mark_node
11468 || TREE_TYPE (arg
) == error_mark_node
11469 || decl_type
== error_mark_node
)
11470 /* Something already went wrong. There's no need to check
11472 return error_mark_node
;
11474 /* [dcl.fct.default]
11476 A default argument expression is implicitly converted to the
11478 ++cp_unevaluated_operand
;
11479 perform_implicit_conversion_flags (decl_type
, arg
, complain
,
11481 --cp_unevaluated_operand
;
11483 /* Avoid redundant -Wzero-as-null-pointer-constant warnings at
11485 if (TYPE_PTR_OR_PTRMEM_P (decl_type
)
11486 && null_ptr_cst_p (arg
))
11487 return nullptr_node
;
11489 /* [dcl.fct.default]
11491 Local variables shall not be used in default argument
11494 The keyword `this' shall not be used in a default argument of a
11495 member function. */
11496 var
= cp_walk_tree_without_duplicates (&arg
, local_variable_p_walkfn
, NULL
);
11499 if (complain
& tf_warning_or_error
)
11501 if (DECL_NAME (var
) == this_identifier
)
11502 permerror (input_location
, "default argument %qE uses %qD",
11505 error ("default argument %qE uses local variable %qD", arg
, var
);
11507 return error_mark_node
;
11514 /* Returns a deprecated type used within TYPE, or NULL_TREE if none. */
11517 type_is_deprecated (tree type
)
11519 enum tree_code code
;
11520 if (TREE_DEPRECATED (type
))
11522 if (TYPE_NAME (type
)
11523 && TREE_DEPRECATED (TYPE_NAME (type
)))
11526 /* Do warn about using typedefs to a deprecated class. */
11527 if (OVERLOAD_TYPE_P (type
) && type
!= TYPE_MAIN_VARIANT (type
))
11528 return type_is_deprecated (TYPE_MAIN_VARIANT (type
));
11530 code
= TREE_CODE (type
);
11532 if (code
== POINTER_TYPE
|| code
== REFERENCE_TYPE
11533 || code
== OFFSET_TYPE
|| code
== FUNCTION_TYPE
11534 || code
== METHOD_TYPE
|| code
== ARRAY_TYPE
)
11535 return type_is_deprecated (TREE_TYPE (type
));
11537 if (TYPE_PTRMEMFUNC_P (type
))
11538 return type_is_deprecated
11539 (TREE_TYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (type
))));
11544 /* Decode the list of parameter types for a function type.
11545 Given the list of things declared inside the parens,
11546 return a list of types.
11548 If this parameter does not end with an ellipsis, we append
11551 *PARMS is set to the chain of PARM_DECLs created. */
11554 grokparms (tree parmlist
, tree
*parms
)
11556 tree result
= NULL_TREE
;
11557 tree decls
= NULL_TREE
;
11561 for (parm
= parmlist
; parm
!= NULL_TREE
; parm
= TREE_CHAIN (parm
))
11563 tree type
= NULL_TREE
;
11564 tree init
= TREE_PURPOSE (parm
);
11565 tree decl
= TREE_VALUE (parm
);
11566 const char *errmsg
;
11568 if (parm
== void_list_node
)
11571 if (! decl
|| TREE_TYPE (decl
) == error_mark_node
)
11574 type
= TREE_TYPE (decl
);
11575 if (VOID_TYPE_P (type
))
11577 if (same_type_p (type
, void_type_node
)
11579 && !DECL_NAME (decl
) && !result
11580 && TREE_CHAIN (parm
) == void_list_node
)
11581 /* DR 577: A parameter list consisting of a single
11582 unnamed parameter of non-dependent type 'void'. */
11584 else if (cv_qualified_p (type
))
11585 error_at (DECL_SOURCE_LOCATION (decl
),
11586 "invalid use of cv-qualified type %qT in "
11587 "parameter declaration", type
);
11589 error_at (DECL_SOURCE_LOCATION (decl
),
11590 "invalid use of type %<void%> in parameter "
11592 /* It's not a good idea to actually create parameters of
11593 type `void'; other parts of the compiler assume that a
11594 void type terminates the parameter list. */
11595 type
= error_mark_node
;
11596 TREE_TYPE (decl
) = error_mark_node
;
11599 if (type
!= error_mark_node
11600 && TYPE_FOR_JAVA (type
)
11601 && MAYBE_CLASS_TYPE_P (type
))
11603 error ("parameter %qD has Java class type", decl
);
11604 type
= error_mark_node
;
11605 TREE_TYPE (decl
) = error_mark_node
;
11609 if (type
!= error_mark_node
11610 && (errmsg
= targetm
.invalid_parameter_type (type
)))
11613 type
= error_mark_node
;
11614 TREE_TYPE (decl
) = error_mark_node
;
11617 if (type
!= error_mark_node
)
11619 if (deprecated_state
!= DEPRECATED_SUPPRESS
)
11621 tree deptype
= type_is_deprecated (type
);
11623 warn_deprecated_use (deptype
, NULL_TREE
);
11626 /* Top-level qualifiers on the parameters are
11627 ignored for function types. */
11628 type
= cp_build_qualified_type (type
, 0);
11629 if (TREE_CODE (type
) == METHOD_TYPE
)
11631 error ("parameter %qD invalidly declared method type", decl
);
11632 type
= build_pointer_type (type
);
11633 TREE_TYPE (decl
) = type
;
11635 else if (abstract_virtuals_error (decl
, type
))
11636 any_error
= 1; /* Seems like a good idea. */
11637 else if (POINTER_TYPE_P (type
))
11639 /* [dcl.fct]/6, parameter types cannot contain pointers
11640 (references) to arrays of unknown bound. */
11641 tree t
= TREE_TYPE (type
);
11642 int ptr
= TYPE_PTR_P (type
);
11646 if (TYPE_PTR_P (t
))
11648 else if (TREE_CODE (t
) != ARRAY_TYPE
)
11650 else if (!TYPE_DOMAIN (t
))
11654 if (TREE_CODE (t
) == ARRAY_TYPE
)
11656 ? G_("parameter %qD includes pointer to array of "
11657 "unknown bound %qT")
11658 : G_("parameter %qD includes reference to array of "
11659 "unknown bound %qT"),
11665 else if (init
&& !processing_template_decl
)
11666 init
= check_default_argument (decl
, init
, tf_warning_or_error
);
11669 DECL_CHAIN (decl
) = decls
;
11671 result
= tree_cons (init
, type
, result
);
11673 decls
= nreverse (decls
);
11674 result
= nreverse (result
);
11676 result
= chainon (result
, void_list_node
);
11683 /* D is a constructor or overloaded `operator='.
11685 Let T be the class in which D is declared. Then, this function
11688 -1 if D's is an ill-formed constructor or copy assignment operator
11689 whose first parameter is of type `T'.
11690 0 if D is not a copy constructor or copy assignment
11692 1 if D is a copy constructor or copy assignment operator whose
11693 first parameter is a reference to non-const qualified T.
11694 2 if D is a copy constructor or copy assignment operator whose
11695 first parameter is a reference to const qualified T.
11697 This function can be used as a predicate. Positive values indicate
11698 a copy constructor and nonzero values indicate a copy assignment
11702 copy_fn_p (const_tree d
)
11708 gcc_assert (DECL_FUNCTION_MEMBER_P (d
));
11710 if (TREE_CODE (d
) == TEMPLATE_DECL
11711 || (DECL_TEMPLATE_INFO (d
)
11712 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d
))))
11713 /* Instantiations of template member functions are never copy
11714 functions. Note that member functions of templated classes are
11715 represented as template functions internally, and we must
11716 accept those as copy functions. */
11719 args
= FUNCTION_FIRST_USER_PARMTYPE (d
);
11723 arg_type
= TREE_VALUE (args
);
11724 if (arg_type
== error_mark_node
)
11727 if (TYPE_MAIN_VARIANT (arg_type
) == DECL_CONTEXT (d
))
11729 /* Pass by value copy assignment operator. */
11732 else if (TREE_CODE (arg_type
) == REFERENCE_TYPE
11733 && !TYPE_REF_IS_RVALUE (arg_type
)
11734 && TYPE_MAIN_VARIANT (TREE_TYPE (arg_type
)) == DECL_CONTEXT (d
))
11736 if (CP_TYPE_CONST_P (TREE_TYPE (arg_type
)))
11742 args
= TREE_CHAIN (args
);
11744 if (args
&& args
!= void_list_node
&& !TREE_PURPOSE (args
))
11745 /* There are more non-optional args. */
11751 /* D is a constructor or overloaded `operator='.
11753 Let T be the class in which D is declared. Then, this function
11754 returns true when D is a move constructor or move assignment
11755 operator, false otherwise. */
11758 move_fn_p (const_tree d
)
11760 gcc_assert (DECL_FUNCTION_MEMBER_P (d
));
11762 if (cxx_dialect
== cxx98
)
11763 /* There are no move constructors if we are in C++98 mode. */
11766 if (TREE_CODE (d
) == TEMPLATE_DECL
11767 || (DECL_TEMPLATE_INFO (d
)
11768 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d
))))
11769 /* Instantiations of template member functions are never move
11770 functions. Note that member functions of templated classes are
11771 represented as template functions internally, and we must
11772 accept those as move functions. */
11775 return move_signature_fn_p (d
);
11778 /* D is a constructor or overloaded `operator='.
11780 Then, this function returns true when D has the same signature as a move
11781 constructor or move assignment operator (because either it is such a
11782 ctor/op= or it is a template specialization with the same signature),
11783 false otherwise. */
11786 move_signature_fn_p (const_tree d
)
11790 bool result
= false;
11792 args
= FUNCTION_FIRST_USER_PARMTYPE (d
);
11796 arg_type
= TREE_VALUE (args
);
11797 if (arg_type
== error_mark_node
)
11800 if (TREE_CODE (arg_type
) == REFERENCE_TYPE
11801 && TYPE_REF_IS_RVALUE (arg_type
)
11802 && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (arg_type
)),
11806 args
= TREE_CHAIN (args
);
11808 if (args
&& args
!= void_list_node
&& !TREE_PURPOSE (args
))
11809 /* There are more non-optional args. */
11815 /* Remember any special properties of member function DECL. */
11818 grok_special_member_properties (tree decl
)
11822 if (!DECL_NONSTATIC_MEMBER_FUNCTION_P (decl
))
11825 class_type
= DECL_CONTEXT (decl
);
11826 if (DECL_CONSTRUCTOR_P (decl
))
11828 int ctor
= copy_fn_p (decl
);
11830 if (!DECL_ARTIFICIAL (decl
))
11831 TYPE_HAS_USER_CONSTRUCTOR (class_type
) = 1;
11837 A non-template constructor for class X is a copy
11838 constructor if its first parameter is of type X&, const
11839 X&, volatile X& or const volatile X&, and either there
11840 are no other parameters or else all other parameters have
11841 default arguments. */
11842 TYPE_HAS_COPY_CTOR (class_type
) = 1;
11843 if (user_provided_p (decl
))
11844 TYPE_HAS_COMPLEX_COPY_CTOR (class_type
) = 1;
11846 TYPE_HAS_CONST_COPY_CTOR (class_type
) = 1;
11848 else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl
)))
11849 TYPE_HAS_DEFAULT_CONSTRUCTOR (class_type
) = 1;
11850 else if (move_fn_p (decl
) && user_provided_p (decl
))
11851 TYPE_HAS_COMPLEX_MOVE_CTOR (class_type
) = 1;
11852 else if (is_list_ctor (decl
))
11853 TYPE_HAS_LIST_CTOR (class_type
) = 1;
11855 if (DECL_DECLARED_CONSTEXPR_P (decl
)
11856 && !copy_fn_p (decl
) && !move_fn_p (decl
))
11857 TYPE_HAS_CONSTEXPR_CTOR (class_type
) = 1;
11859 else if (DECL_OVERLOADED_OPERATOR_P (decl
) == NOP_EXPR
)
11863 A non-template assignment operator for class X is a copy
11864 assignment operator if its parameter is of type X, X&, const
11865 X&, volatile X& or const volatile X&. */
11867 int assop
= copy_fn_p (decl
);
11871 TYPE_HAS_COPY_ASSIGN (class_type
) = 1;
11872 if (user_provided_p (decl
))
11873 TYPE_HAS_COMPLEX_COPY_ASSIGN (class_type
) = 1;
11875 TYPE_HAS_CONST_COPY_ASSIGN (class_type
) = 1;
11877 else if (move_fn_p (decl
) && user_provided_p (decl
))
11878 TYPE_HAS_COMPLEX_MOVE_ASSIGN (class_type
) = 1;
11880 /* Destructors are handled in check_methods. */
11883 /* Check a constructor DECL has the correct form. Complains
11884 if the class has a constructor of the form X(X). */
11887 grok_ctor_properties (const_tree ctype
, const_tree decl
)
11889 int ctor_parm
= copy_fn_p (decl
);
11895 A declaration of a constructor for a class X is ill-formed if
11896 its first parameter is of type (optionally cv-qualified) X
11897 and either there are no other parameters or else all other
11898 parameters have default arguments.
11900 We *don't* complain about member template instantiations that
11901 have this form, though; they can occur as we try to decide
11902 what constructor to use during overload resolution. Since
11903 overload resolution will never prefer such a constructor to
11904 the non-template copy constructor (which is either explicitly
11905 or implicitly defined), there's no need to worry about their
11906 existence. Theoretically, they should never even be
11907 instantiated, but that's hard to forestall. */
11908 error ("invalid constructor; you probably meant %<%T (const %T&)%>",
11916 /* An operator with this code is unary, but can also be binary. */
11919 ambi_op_p (enum tree_code code
)
11921 return (code
== INDIRECT_REF
11922 || code
== ADDR_EXPR
11923 || code
== UNARY_PLUS_EXPR
11924 || code
== NEGATE_EXPR
11925 || code
== PREINCREMENT_EXPR
11926 || code
== PREDECREMENT_EXPR
);
11929 /* An operator with this name can only be unary. */
11932 unary_op_p (enum tree_code code
)
11934 return (code
== TRUTH_NOT_EXPR
11935 || code
== BIT_NOT_EXPR
11936 || code
== COMPONENT_REF
11937 || code
== TYPE_EXPR
);
11940 /* DECL is a declaration for an overloaded operator. If COMPLAIN is true,
11941 errors are issued for invalid declarations. */
11944 grok_op_properties (tree decl
, bool complain
)
11946 tree argtypes
= TYPE_ARG_TYPES (TREE_TYPE (decl
));
11948 int methodp
= (TREE_CODE (TREE_TYPE (decl
)) == METHOD_TYPE
);
11949 tree name
= DECL_NAME (decl
);
11950 enum tree_code operator_code
;
11955 /* Count the number of arguments and check for ellipsis. */
11956 for (argtype
= argtypes
, arity
= 0;
11957 argtype
&& argtype
!= void_list_node
;
11958 argtype
= TREE_CHAIN (argtype
))
11960 ellipsis_p
= !argtype
;
11962 class_type
= DECL_CONTEXT (decl
);
11963 if (class_type
&& !CLASS_TYPE_P (class_type
))
11964 class_type
= NULL_TREE
;
11966 if (DECL_CONV_FN_P (decl
))
11967 operator_code
= TYPE_EXPR
;
11971 #define DEF_OPERATOR(NAME, CODE, MANGLING, ARITY, ASSN_P) \
11972 if (ansi_opname (CODE) == name) \
11974 operator_code = (CODE); \
11977 else if (ansi_assopname (CODE) == name) \
11979 operator_code = (CODE); \
11980 DECL_ASSIGNMENT_OPERATOR_P (decl) = 1; \
11984 #include "operators.def"
11985 #undef DEF_OPERATOR
11987 gcc_unreachable ();
11990 gcc_assert (operator_code
!= MAX_TREE_CODES
);
11991 SET_OVERLOADED_OPERATOR_CODE (decl
, operator_code
);
11994 switch (operator_code
)
11997 TYPE_HAS_NEW_OPERATOR (class_type
) = 1;
12001 TYPE_GETS_DELETE (class_type
) |= 1;
12005 TYPE_HAS_ARRAY_NEW_OPERATOR (class_type
) = 1;
12008 case VEC_DELETE_EXPR
:
12009 TYPE_GETS_DELETE (class_type
) |= 2;
12016 /* [basic.std.dynamic.allocation]/1:
12018 A program is ill-formed if an allocation function is declared
12019 in a namespace scope other than global scope or declared static
12022 The same also holds true for deallocation functions. */
12023 if (operator_code
== NEW_EXPR
|| operator_code
== VEC_NEW_EXPR
12024 || operator_code
== DELETE_EXPR
|| operator_code
== VEC_DELETE_EXPR
)
12026 if (DECL_NAMESPACE_SCOPE_P (decl
))
12028 if (CP_DECL_CONTEXT (decl
) != global_namespace
)
12030 error ("%qD may not be declared within a namespace", decl
);
12033 else if (!TREE_PUBLIC (decl
))
12035 error ("%qD may not be declared as static", decl
);
12041 if (operator_code
== NEW_EXPR
|| operator_code
== VEC_NEW_EXPR
)
12043 TREE_TYPE (decl
) = coerce_new_type (TREE_TYPE (decl
));
12044 DECL_IS_OPERATOR_NEW (decl
) = 1;
12046 else if (operator_code
== DELETE_EXPR
|| operator_code
== VEC_DELETE_EXPR
)
12047 TREE_TYPE (decl
) = coerce_delete_type (TREE_TYPE (decl
));
12050 /* An operator function must either be a non-static member function
12051 or have at least one parameter of a class, a reference to a class,
12052 an enumeration, or a reference to an enumeration. 13.4.0.6 */
12053 if (! methodp
|| DECL_STATIC_FUNCTION_P (decl
))
12055 if (operator_code
== TYPE_EXPR
12056 || operator_code
== CALL_EXPR
12057 || operator_code
== COMPONENT_REF
12058 || operator_code
== ARRAY_REF
12059 || operator_code
== NOP_EXPR
)
12061 error ("%qD must be a nonstatic member function", decl
);
12068 if (DECL_STATIC_FUNCTION_P (decl
))
12070 error ("%qD must be either a non-static member "
12071 "function or a non-member function", decl
);
12075 for (p
= argtypes
; p
&& p
!= void_list_node
; p
= TREE_CHAIN (p
))
12077 tree arg
= non_reference (TREE_VALUE (p
));
12078 if (arg
== error_mark_node
)
12081 /* MAYBE_CLASS_TYPE_P, rather than CLASS_TYPE_P, is used
12082 because these checks are performed even on
12083 template functions. */
12084 if (MAYBE_CLASS_TYPE_P (arg
)
12085 || TREE_CODE (arg
) == ENUMERAL_TYPE
)
12089 if (!p
|| p
== void_list_node
)
12092 error ("%qD must have an argument of class or "
12093 "enumerated type", decl
);
12099 /* There are no restrictions on the arguments to an overloaded
12101 if (operator_code
== CALL_EXPR
)
12104 /* Warn about conversion operators that will never be used. */
12105 if (IDENTIFIER_TYPENAME_P (name
)
12106 && ! DECL_TEMPLATE_INFO (decl
)
12108 /* Warn only declaring the function; there is no need to
12109 warn again about out-of-class definitions. */
12110 && class_type
== current_class_type
)
12112 tree t
= TREE_TYPE (name
);
12113 int ref
= (TREE_CODE (t
) == REFERENCE_TYPE
);
12116 t
= TYPE_MAIN_VARIANT (TREE_TYPE (t
));
12118 if (VOID_TYPE_P (t
))
12119 warning (OPT_Wconversion
,
12121 ? G_("conversion to a reference to void "
12122 "will never use a type conversion operator")
12123 : G_("conversion to void "
12124 "will never use a type conversion operator"));
12125 else if (class_type
)
12127 if (t
== class_type
)
12128 warning (OPT_Wconversion
,
12130 ? G_("conversion to a reference to the same type "
12131 "will never use a type conversion operator")
12132 : G_("conversion to the same type "
12133 "will never use a type conversion operator"));
12134 /* Don't force t to be complete here. */
12135 else if (MAYBE_CLASS_TYPE_P (t
)
12136 && COMPLETE_TYPE_P (t
)
12137 && DERIVED_FROM_P (t
, class_type
))
12138 warning (OPT_Wconversion
,
12140 ? G_("conversion to a reference to a base class "
12141 "will never use a type conversion operator")
12142 : G_("conversion to a base class "
12143 "will never use a type conversion operator"));
12148 if (operator_code
== COND_EXPR
)
12151 error ("ISO C++ prohibits overloading operator ?:");
12154 else if (ellipsis_p
)
12156 error ("%qD must not have variable number of arguments", decl
);
12159 else if (ambi_op_p (operator_code
))
12162 /* We pick the one-argument operator codes by default, so
12163 we don't have to change anything. */
12165 else if (arity
== 2)
12167 /* If we thought this was a unary operator, we now know
12168 it to be a binary operator. */
12169 switch (operator_code
)
12172 operator_code
= MULT_EXPR
;
12176 operator_code
= BIT_AND_EXPR
;
12179 case UNARY_PLUS_EXPR
:
12180 operator_code
= PLUS_EXPR
;
12184 operator_code
= MINUS_EXPR
;
12187 case PREINCREMENT_EXPR
:
12188 operator_code
= POSTINCREMENT_EXPR
;
12191 case PREDECREMENT_EXPR
:
12192 operator_code
= POSTDECREMENT_EXPR
;
12196 gcc_unreachable ();
12199 SET_OVERLOADED_OPERATOR_CODE (decl
, operator_code
);
12201 if ((operator_code
== POSTINCREMENT_EXPR
12202 || operator_code
== POSTDECREMENT_EXPR
)
12203 && ! processing_template_decl
12204 && ! same_type_p (TREE_VALUE (TREE_CHAIN (argtypes
)), integer_type_node
))
12207 error ("postfix %qD must take %<int%> as its argument",
12210 error ("postfix %qD must take %<int%> as its second "
12218 error ("%qD must take either zero or one argument", decl
);
12220 error ("%qD must take either one or two arguments", decl
);
12224 /* More Effective C++ rule 6. */
12226 && (operator_code
== POSTINCREMENT_EXPR
12227 || operator_code
== POSTDECREMENT_EXPR
12228 || operator_code
== PREINCREMENT_EXPR
12229 || operator_code
== PREDECREMENT_EXPR
))
12231 tree arg
= TREE_VALUE (argtypes
);
12232 tree ret
= TREE_TYPE (TREE_TYPE (decl
));
12233 if (methodp
|| TREE_CODE (arg
) == REFERENCE_TYPE
)
12234 arg
= TREE_TYPE (arg
);
12235 arg
= TYPE_MAIN_VARIANT (arg
);
12236 if (operator_code
== PREINCREMENT_EXPR
12237 || operator_code
== PREDECREMENT_EXPR
)
12239 if (TREE_CODE (ret
) != REFERENCE_TYPE
12240 || !same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (ret
)),
12242 warning (OPT_Weffc__
, "prefix %qD should return %qT", decl
,
12243 build_reference_type (arg
));
12247 if (!same_type_p (TYPE_MAIN_VARIANT (ret
), arg
))
12248 warning (OPT_Weffc__
, "postfix %qD should return %qT", decl
, arg
);
12252 else if (unary_op_p (operator_code
))
12257 error ("%qD must take %<void%>", decl
);
12259 error ("%qD must take exactly one argument", decl
);
12263 else /* if (binary_op_p (operator_code)) */
12268 error ("%qD must take exactly one argument", decl
);
12270 error ("%qD must take exactly two arguments", decl
);
12274 /* More Effective C++ rule 7. */
12276 && (operator_code
== TRUTH_ANDIF_EXPR
12277 || operator_code
== TRUTH_ORIF_EXPR
12278 || operator_code
== COMPOUND_EXPR
))
12279 warning (OPT_Weffc__
, "user-defined %qD always evaluates both arguments",
12283 /* Effective C++ rule 23. */
12286 && !DECL_ASSIGNMENT_OPERATOR_P (decl
)
12287 && (operator_code
== PLUS_EXPR
12288 || operator_code
== MINUS_EXPR
12289 || operator_code
== TRUNC_DIV_EXPR
12290 || operator_code
== MULT_EXPR
12291 || operator_code
== TRUNC_MOD_EXPR
)
12292 && TREE_CODE (TREE_TYPE (TREE_TYPE (decl
))) == REFERENCE_TYPE
)
12293 warning (OPT_Weffc__
, "%qD should return by value", decl
);
12295 /* [over.oper]/8 */
12296 for (; argtypes
&& argtypes
!= void_list_node
;
12297 argtypes
= TREE_CHAIN (argtypes
))
12298 if (TREE_PURPOSE (argtypes
))
12300 TREE_PURPOSE (argtypes
) = NULL_TREE
;
12301 if (operator_code
== POSTINCREMENT_EXPR
12302 || operator_code
== POSTDECREMENT_EXPR
)
12304 pedwarn (input_location
, OPT_Wpedantic
, "%qD cannot have default arguments",
12309 error ("%qD cannot have default arguments", decl
);
12317 /* Return a string giving the keyword associate with CODE. */
12319 static const char *
12320 tag_name (enum tag_types code
)
12332 case typename_type
:
12335 gcc_unreachable ();
12339 /* Name lookup in an elaborated-type-specifier (after the keyword
12340 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
12341 elaborated-type-specifier is invalid, issue a diagnostic and return
12342 error_mark_node; otherwise, return the *_TYPE to which it referred.
12343 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
12346 check_elaborated_type_specifier (enum tag_types tag_code
,
12348 bool allow_template_p
)
12354 struct S { struct S *p; };
12356 name lookup will find the TYPE_DECL for the implicit "S::S"
12357 typedef. Adjust for that here. */
12358 if (DECL_SELF_REFERENCE_P (decl
))
12359 decl
= TYPE_NAME (TREE_TYPE (decl
));
12361 type
= TREE_TYPE (decl
);
12363 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
12364 is false for this case as well. */
12365 if (TREE_CODE (type
) == TEMPLATE_TYPE_PARM
)
12367 error ("using template type parameter %qT after %qs",
12368 type
, tag_name (tag_code
));
12369 return error_mark_node
;
12371 /* Accept template template parameters. */
12372 else if (allow_template_p
12373 && (TREE_CODE (type
) == BOUND_TEMPLATE_TEMPLATE_PARM
12374 || TREE_CODE (type
) == TEMPLATE_TEMPLATE_PARM
))
12378 If the identifier resolves to a typedef-name or the
12379 simple-template-id resolves to an alias template
12380 specialization, the elaborated-type-specifier is ill-formed.
12382 In other words, the only legitimate declaration to use in the
12383 elaborated type specifier is the implicit typedef created when
12384 the type is declared. */
12385 else if (!DECL_IMPLICIT_TYPEDEF_P (decl
)
12386 && !DECL_SELF_REFERENCE_P (decl
)
12387 && tag_code
!= typename_type
)
12389 if (alias_template_specialization_p (type
))
12390 error ("using alias template specialization %qT after %qs",
12391 type
, tag_name (tag_code
));
12393 error ("using typedef-name %qD after %qs", decl
, tag_name (tag_code
));
12394 inform (DECL_SOURCE_LOCATION (decl
),
12395 "%qD has a previous declaration here", decl
);
12396 return error_mark_node
;
12398 else if (TREE_CODE (type
) != RECORD_TYPE
12399 && TREE_CODE (type
) != UNION_TYPE
12400 && tag_code
!= enum_type
12401 && tag_code
!= typename_type
)
12403 error ("%qT referred to as %qs", type
, tag_name (tag_code
));
12404 inform (input_location
, "%q+T has a previous declaration here", type
);
12405 return error_mark_node
;
12407 else if (TREE_CODE (type
) != ENUMERAL_TYPE
12408 && tag_code
== enum_type
)
12410 error ("%qT referred to as enum", type
);
12411 inform (input_location
, "%q+T has a previous declaration here", type
);
12412 return error_mark_node
;
12414 else if (!allow_template_p
12415 && TREE_CODE (type
) == RECORD_TYPE
12416 && CLASSTYPE_IS_TEMPLATE (type
))
12418 /* If a class template appears as elaborated type specifier
12419 without a template header such as:
12421 template <class T> class C {};
12422 void f(class C); // No template header here
12424 then the required template argument is missing. */
12425 error ("template argument required for %<%s %T%>",
12426 tag_name (tag_code
),
12427 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type
)));
12428 return error_mark_node
;
12434 /* Lookup NAME in elaborate type specifier in scope according to
12435 SCOPE and issue diagnostics if necessary.
12436 Return *_TYPE node upon success, NULL_TREE when the NAME is not
12437 found, and ERROR_MARK_NODE for type error. */
12440 lookup_and_check_tag (enum tag_types tag_code
, tree name
,
12441 tag_scope scope
, bool template_header_p
)
12445 if (scope
== ts_global
)
12447 /* First try ordinary name lookup, ignoring hidden class name
12448 injected via friend declaration. */
12449 decl
= lookup_name_prefer_type (name
, 2);
12450 decl
= strip_using_decl (decl
);
12451 /* If that fails, the name will be placed in the smallest
12452 non-class, non-function-prototype scope according to 3.3.1/5.
12453 We may already have a hidden name declared as friend in this
12454 scope. So lookup again but not ignoring hidden names.
12455 If we find one, that name will be made visible rather than
12456 creating a new tag. */
12458 decl
= lookup_type_scope (name
, ts_within_enclosing_non_class
);
12461 decl
= lookup_type_scope (name
, scope
);
12464 && (DECL_CLASS_TEMPLATE_P (decl
)
12465 /* If scope is ts_current we're defining a class, so ignore a
12466 template template parameter. */
12467 || (scope
!= ts_current
12468 && DECL_TEMPLATE_TEMPLATE_PARM_P (decl
))))
12469 decl
= DECL_TEMPLATE_RESULT (decl
);
12471 if (decl
&& TREE_CODE (decl
) == TYPE_DECL
)
12473 /* Look for invalid nested type:
12477 if (scope
== ts_current
&& DECL_SELF_REFERENCE_P (decl
))
12479 error ("%qD has the same name as the class in which it is "
12482 return error_mark_node
;
12485 /* Two cases we need to consider when deciding if a class
12486 template is allowed as an elaborated type specifier:
12487 1. It is a self reference to its own class.
12488 2. It comes with a template header.
12492 template <class T> class C {
12493 class C *c1; // DECL_SELF_REFERENCE_P is true
12496 template <class U> class C; // template_header_p is true
12497 template <class T> class C<T>::D {
12498 class C *c2; // DECL_SELF_REFERENCE_P is true
12501 t
= check_elaborated_type_specifier (tag_code
,
12504 | DECL_SELF_REFERENCE_P (decl
));
12507 else if (decl
&& TREE_CODE (decl
) == TREE_LIST
)
12509 error ("reference to %qD is ambiguous", name
);
12510 print_candidates (decl
);
12511 return error_mark_node
;
12517 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
12518 Define the tag as a forward-reference if it is not defined.
12520 If a declaration is given, process it here, and report an error if
12521 multiple declarations are not identical.
12523 SCOPE is TS_CURRENT when this is also a definition. Only look in
12524 the current frame for the name (since C++ allows new names in any
12525 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
12526 declaration. Only look beginning from the current scope outward up
12527 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
12529 TEMPLATE_HEADER_P is true when this declaration is preceded by
12530 a set of template parameters. */
12533 xref_tag_1 (enum tag_types tag_code
, tree name
,
12534 tag_scope orig_scope
, bool template_header_p
)
12536 enum tree_code code
;
12538 tree context
= NULL_TREE
;
12541 gcc_assert (identifier_p (name
));
12547 code
= RECORD_TYPE
;
12553 code
= ENUMERAL_TYPE
;
12556 gcc_unreachable ();
12559 if (orig_scope
== ts_lambda
)
12560 scope
= ts_current
;
12562 scope
= orig_scope
;
12564 /* In case of anonymous name, xref_tag is only called to
12565 make type node and push name. Name lookup is not required. */
12566 if (anon_aggrname_p (name
))
12569 t
= lookup_and_check_tag (tag_code
, name
,
12570 scope
, template_header_p
);
12572 if (t
== error_mark_node
)
12573 return error_mark_node
;
12575 if (scope
!= ts_current
&& t
&& current_class_type
12576 && template_class_depth (current_class_type
)
12577 && template_header_p
)
12579 if (TREE_CODE (t
) == TEMPLATE_TEMPLATE_PARM
)
12582 /* Since SCOPE is not TS_CURRENT, we are not looking at a
12583 definition of this tag. Since, in addition, we are currently
12584 processing a (member) template declaration of a template
12585 class, we must be very careful; consider:
12592 { template <class V>
12593 friend struct S1; };
12595 Here, the S2::S1 declaration should not be confused with the
12596 outer declaration. In particular, the inner version should
12597 have a template parameter of level 2, not level 1. This
12598 would be particularly important if the member declaration
12601 template <class V = U> friend struct S1;
12603 say, when we should tsubst into `U' when instantiating
12604 S2. On the other hand, when presented with:
12614 we must find the inner binding eventually. We
12615 accomplish this by making sure that the new type we
12616 create to represent this declaration has the right
12618 context
= TYPE_CONTEXT (t
);
12624 /* If no such tag is yet defined, create a forward-reference node
12625 and record it as the "definition".
12626 When a real declaration of this type is found,
12627 the forward-reference will be altered into a real type. */
12628 if (code
== ENUMERAL_TYPE
)
12630 error ("use of enum %q#D without previous declaration", name
);
12631 return error_mark_node
;
12635 t
= make_class_type (code
);
12636 TYPE_CONTEXT (t
) = context
;
12637 if (orig_scope
== ts_lambda
)
12638 /* Remember that we're declaring a lambda to avoid bogus errors
12639 in push_template_decl. */
12640 CLASSTYPE_LAMBDA_EXPR (t
) = error_mark_node
;
12641 t
= pushtag (name
, t
, scope
);
12646 if (template_header_p
&& MAYBE_CLASS_TYPE_P (t
))
12648 /* Check that we aren't trying to overload a class with different
12650 tree constr
= NULL_TREE
;
12651 if (current_template_parms
)
12653 tree reqs
= TEMPLATE_PARMS_CONSTRAINTS (current_template_parms
);
12654 constr
= build_constraints (reqs
, NULL_TREE
);
12656 if (!redeclare_class_template (t
, current_template_parms
, constr
))
12657 return error_mark_node
;
12659 else if (!processing_template_decl
12660 && CLASS_TYPE_P (t
)
12661 && CLASSTYPE_IS_TEMPLATE (t
))
12663 error ("redeclaration of %qT as a non-template", t
);
12664 error ("previous declaration %q+D", t
);
12665 return error_mark_node
;
12668 /* Make injected friend class visible. */
12669 if (scope
!= ts_within_enclosing_non_class
12670 && hidden_name_p (TYPE_NAME (t
)))
12672 DECL_ANTICIPATED (TYPE_NAME (t
)) = 0;
12673 DECL_FRIEND_P (TYPE_NAME (t
)) = 0;
12675 if (TYPE_TEMPLATE_INFO (t
))
12677 DECL_ANTICIPATED (TYPE_TI_TEMPLATE (t
)) = 0;
12678 DECL_FRIEND_P (TYPE_TI_TEMPLATE (t
)) = 0;
12686 /* Wrapper for xref_tag_1. */
12689 xref_tag (enum tag_types tag_code
, tree name
,
12690 tag_scope scope
, bool template_header_p
)
12694 subtime
= timevar_cond_start (TV_NAME_LOOKUP
);
12695 ret
= xref_tag_1 (tag_code
, name
, scope
, template_header_p
);
12696 timevar_cond_stop (TV_NAME_LOOKUP
, subtime
);
12702 xref_tag_from_type (tree old
, tree id
, tag_scope scope
)
12704 enum tag_types tag_kind
;
12706 if (TREE_CODE (old
) == RECORD_TYPE
)
12707 tag_kind
= (CLASSTYPE_DECLARED_CLASS (old
) ? class_type
: record_type
);
12709 tag_kind
= union_type
;
12711 if (id
== NULL_TREE
)
12712 id
= TYPE_IDENTIFIER (old
);
12714 return xref_tag (tag_kind
, id
, scope
, false);
12717 /* Create the binfo hierarchy for REF with (possibly NULL) base list
12718 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
12719 access_* node, and the TREE_VALUE is the type of the base-class.
12720 Non-NULL TREE_TYPE indicates virtual inheritance.
12722 Returns true if the binfo hierarchy was successfully created,
12723 false if an error was detected. */
12726 xref_basetypes (tree ref
, tree base_list
)
12729 tree binfo
, base_binfo
;
12730 unsigned max_vbases
= 0; /* Maximum direct & indirect virtual bases. */
12731 unsigned max_bases
= 0; /* Maximum direct bases. */
12732 unsigned max_dvbases
= 0; /* Maximum direct virtual bases. */
12734 tree default_access
;
12735 tree igo_prev
; /* Track Inheritance Graph Order. */
12737 if (ref
== error_mark_node
)
12740 /* The base of a derived class is private by default, all others are
12742 default_access
= (TREE_CODE (ref
) == RECORD_TYPE
12743 && CLASSTYPE_DECLARED_CLASS (ref
)
12744 ? access_private_node
: access_public_node
);
12746 /* First, make sure that any templates in base-classes are
12747 instantiated. This ensures that if we call ourselves recursively
12748 we do not get confused about which classes are marked and which
12750 basep
= &base_list
;
12753 tree basetype
= TREE_VALUE (*basep
);
12755 /* The dependent_type_p call below should really be dependent_scope_p
12756 so that we give a hard error about using an incomplete type as a
12757 base, but we allow it with a pedwarn for backward
12759 if (processing_template_decl
12760 && CLASS_TYPE_P (basetype
) && TYPE_BEING_DEFINED (basetype
))
12761 cxx_incomplete_type_diagnostic (NULL_TREE
, basetype
, DK_PEDWARN
);
12762 if (!dependent_type_p (basetype
)
12763 && !complete_type_or_else (basetype
, NULL
))
12764 /* An incomplete type. Remove it from the list. */
12765 *basep
= TREE_CHAIN (*basep
);
12769 if (TREE_TYPE (*basep
))
12771 if (CLASS_TYPE_P (basetype
))
12772 max_vbases
+= vec_safe_length (CLASSTYPE_VBASECLASSES (basetype
));
12773 basep
= &TREE_CHAIN (*basep
);
12776 max_vbases
+= max_dvbases
;
12778 TYPE_MARKED_P (ref
) = 1;
12780 /* The binfo slot should be empty, unless this is an (ill-formed)
12782 if (TYPE_BINFO (ref
) && !TYPE_SIZE (ref
))
12784 error ("redefinition of %q#T", ref
);
12788 gcc_assert (TYPE_MAIN_VARIANT (ref
) == ref
);
12790 binfo
= make_tree_binfo (max_bases
);
12792 TYPE_BINFO (ref
) = binfo
;
12793 BINFO_OFFSET (binfo
) = size_zero_node
;
12794 BINFO_TYPE (binfo
) = ref
;
12796 /* Apply base-class info set up to the variants of this type. */
12797 fixup_type_variants (ref
);
12801 vec_alloc (BINFO_BASE_ACCESSES (binfo
), max_bases
);
12802 /* An aggregate cannot have baseclasses. */
12803 CLASSTYPE_NON_AGGREGATE (ref
) = 1;
12805 if (TREE_CODE (ref
) == UNION_TYPE
)
12807 error ("derived union %qT invalid", ref
);
12814 if (TYPE_FOR_JAVA (ref
))
12816 error ("Java class %qT cannot have multiple bases", ref
);
12820 warning (OPT_Wmultiple_inheritance
,
12821 "%qT defined with multiple direct bases", ref
);
12826 vec_alloc (CLASSTYPE_VBASECLASSES (ref
), max_vbases
);
12828 if (TYPE_FOR_JAVA (ref
))
12830 error ("Java class %qT cannot have virtual bases", ref
);
12833 else if (max_dvbases
)
12834 warning (OPT_Wvirtual_inheritance
,
12835 "%qT defined with direct virtual base", ref
);
12838 for (igo_prev
= binfo
; base_list
; base_list
= TREE_CHAIN (base_list
))
12840 tree access
= TREE_PURPOSE (base_list
);
12841 int via_virtual
= TREE_TYPE (base_list
) != NULL_TREE
;
12842 tree basetype
= TREE_VALUE (base_list
);
12844 if (access
== access_default_node
)
12845 access
= default_access
;
12847 if (PACK_EXPANSION_P (basetype
))
12848 basetype
= PACK_EXPANSION_PATTERN (basetype
);
12849 if (TREE_CODE (basetype
) == TYPE_DECL
)
12850 basetype
= TREE_TYPE (basetype
);
12851 if (!MAYBE_CLASS_TYPE_P (basetype
) || TREE_CODE (basetype
) == UNION_TYPE
)
12853 error ("base type %qT fails to be a struct or class type",
12858 if (TYPE_FOR_JAVA (basetype
) && (current_lang_depth () == 0))
12859 TYPE_FOR_JAVA (ref
) = 1;
12861 base_binfo
= NULL_TREE
;
12862 if (CLASS_TYPE_P (basetype
) && !dependent_scope_p (basetype
))
12864 base_binfo
= TYPE_BINFO (basetype
);
12865 /* The original basetype could have been a typedef'd type. */
12866 basetype
= BINFO_TYPE (base_binfo
);
12868 /* Inherit flags from the base. */
12869 TYPE_HAS_NEW_OPERATOR (ref
)
12870 |= TYPE_HAS_NEW_OPERATOR (basetype
);
12871 TYPE_HAS_ARRAY_NEW_OPERATOR (ref
)
12872 |= TYPE_HAS_ARRAY_NEW_OPERATOR (basetype
);
12873 TYPE_GETS_DELETE (ref
) |= TYPE_GETS_DELETE (basetype
);
12874 TYPE_HAS_CONVERSION (ref
) |= TYPE_HAS_CONVERSION (basetype
);
12875 CLASSTYPE_DIAMOND_SHAPED_P (ref
)
12876 |= CLASSTYPE_DIAMOND_SHAPED_P (basetype
);
12877 CLASSTYPE_REPEATED_BASE_P (ref
)
12878 |= CLASSTYPE_REPEATED_BASE_P (basetype
);
12881 /* We must do this test after we've seen through a typedef
12883 if (TYPE_MARKED_P (basetype
))
12885 if (basetype
== ref
)
12886 error ("recursive type %qT undefined", basetype
);
12888 error ("duplicate base type %qT invalid", basetype
);
12892 if (PACK_EXPANSION_P (TREE_VALUE (base_list
)))
12893 /* Regenerate the pack expansion for the bases. */
12894 basetype
= make_pack_expansion (basetype
);
12896 TYPE_MARKED_P (basetype
) = 1;
12898 base_binfo
= copy_binfo (base_binfo
, basetype
, ref
,
12899 &igo_prev
, via_virtual
);
12900 if (!BINFO_INHERITANCE_CHAIN (base_binfo
))
12901 BINFO_INHERITANCE_CHAIN (base_binfo
) = binfo
;
12903 BINFO_BASE_APPEND (binfo
, base_binfo
);
12904 BINFO_BASE_ACCESS_APPEND (binfo
, access
);
12907 if (vec_safe_length (CLASSTYPE_VBASECLASSES (ref
)) < max_vbases
)
12908 /* If we didn't get max_vbases vbases, we must have shared at
12909 least one of them, and are therefore diamond shaped. */
12910 CLASSTYPE_DIAMOND_SHAPED_P (ref
) = 1;
12912 /* Unmark all the types. */
12913 for (i
= 0; BINFO_BASE_ITERATE (binfo
, i
, base_binfo
); i
++)
12914 TYPE_MARKED_P (BINFO_TYPE (base_binfo
)) = 0;
12915 TYPE_MARKED_P (ref
) = 0;
12917 /* Now see if we have a repeated base type. */
12918 if (!CLASSTYPE_REPEATED_BASE_P (ref
))
12920 for (base_binfo
= binfo
; base_binfo
;
12921 base_binfo
= TREE_CHAIN (base_binfo
))
12923 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo
)))
12925 CLASSTYPE_REPEATED_BASE_P (ref
) = 1;
12928 TYPE_MARKED_P (BINFO_TYPE (base_binfo
)) = 1;
12930 for (base_binfo
= binfo
; base_binfo
;
12931 base_binfo
= TREE_CHAIN (base_binfo
))
12932 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo
)))
12933 TYPE_MARKED_P (BINFO_TYPE (base_binfo
)) = 0;
12942 /* Copies the enum-related properties from type SRC to type DST.
12943 Used with the underlying type of an enum and the enum itself. */
12945 copy_type_enum (tree dst
, tree src
)
12948 for (t
= dst
; t
; t
= TYPE_NEXT_VARIANT (t
))
12950 TYPE_MIN_VALUE (t
) = TYPE_MIN_VALUE (src
);
12951 TYPE_MAX_VALUE (t
) = TYPE_MAX_VALUE (src
);
12952 TYPE_SIZE (t
) = TYPE_SIZE (src
);
12953 TYPE_SIZE_UNIT (t
) = TYPE_SIZE_UNIT (src
);
12954 SET_TYPE_MODE (dst
, TYPE_MODE (src
));
12955 TYPE_PRECISION (t
) = TYPE_PRECISION (src
);
12956 TYPE_ALIGN (t
) = TYPE_ALIGN (src
);
12957 TYPE_USER_ALIGN (t
) = TYPE_USER_ALIGN (src
);
12958 TYPE_UNSIGNED (t
) = TYPE_UNSIGNED (src
);
12962 /* Begin compiling the definition of an enumeration type.
12965 if ENUMTYPE is not NULL_TREE then the type has alredy been found.
12967 UNDERLYING_TYPE is the type that will be used as the storage for
12968 the enumeration type. This should be NULL_TREE if no storage type
12971 SCOPED_ENUM_P is true if this is a scoped enumeration type.
12973 if IS_NEW is not NULL, gets TRUE iff a new type is created.
12975 Returns the type object, as yet incomplete.
12976 Also records info about it so that build_enumerator
12977 may be used to declare the individual values as they are read. */
12980 start_enum (tree name
, tree enumtype
, tree underlying_type
,
12981 bool scoped_enum_p
, bool *is_new
)
12983 tree prevtype
= NULL_TREE
;
12984 gcc_assert (identifier_p (name
));
12988 /* [C++0x dcl.enum]p5:
12990 If not explicitly specified, the underlying type of a scoped
12991 enumeration type is int. */
12992 if (!underlying_type
&& scoped_enum_p
)
12993 underlying_type
= integer_type_node
;
12995 if (underlying_type
)
12996 underlying_type
= cv_unqualified (underlying_type
);
12998 /* If this is the real definition for a previous forward reference,
12999 fill in the contents in the same object that used to be the
13000 forward reference. */
13002 enumtype
= lookup_and_check_tag (enum_type
, name
,
13003 /*tag_scope=*/ts_current
,
13004 /*template_header_p=*/false);
13006 /* In case of a template_decl, the only check that should be deferred
13007 to instantiation time is the comparison of underlying types. */
13008 if (enumtype
&& TREE_CODE (enumtype
) == ENUMERAL_TYPE
)
13010 if (scoped_enum_p
!= SCOPED_ENUM_P (enumtype
))
13012 error_at (input_location
, "scoped/unscoped mismatch "
13013 "in enum %q#T", enumtype
);
13014 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype
)),
13015 "previous definition here");
13016 enumtype
= error_mark_node
;
13018 else if (ENUM_FIXED_UNDERLYING_TYPE_P (enumtype
) != !! underlying_type
)
13020 error_at (input_location
, "underlying type mismatch "
13021 "in enum %q#T", enumtype
);
13022 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype
)),
13023 "previous definition here");
13024 enumtype
= error_mark_node
;
13026 else if (underlying_type
&& ENUM_UNDERLYING_TYPE (enumtype
)
13027 && !dependent_type_p (underlying_type
)
13028 && !dependent_type_p (ENUM_UNDERLYING_TYPE (enumtype
))
13029 && !same_type_p (underlying_type
,
13030 ENUM_UNDERLYING_TYPE (enumtype
)))
13032 error_at (input_location
, "different underlying type "
13033 "in enum %q#T", enumtype
);
13034 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype
)),
13035 "previous definition here");
13036 underlying_type
= NULL_TREE
;
13040 if (!enumtype
|| TREE_CODE (enumtype
) != ENUMERAL_TYPE
13041 || processing_template_decl
)
13043 /* In case of error, make a dummy enum to allow parsing to
13045 if (enumtype
== error_mark_node
)
13047 name
= make_anon_name ();
13048 enumtype
= NULL_TREE
;
13051 /* enumtype may be an ENUMERAL_TYPE if this is a redefinition
13052 of an opaque enum, or an opaque enum of an already defined
13053 enumeration (C++0x only).
13054 In any other case, it'll be NULL_TREE. */
13060 prevtype
= enumtype
;
13062 /* Do not push the decl more than once, unless we need to
13063 compare underlying types at instantiation time */
13065 || TREE_CODE (enumtype
) != ENUMERAL_TYPE
13066 || (underlying_type
13067 && dependent_type_p (underlying_type
))
13068 || (ENUM_UNDERLYING_TYPE (enumtype
)
13069 && dependent_type_p (ENUM_UNDERLYING_TYPE (enumtype
))))
13071 enumtype
= cxx_make_type (ENUMERAL_TYPE
);
13072 enumtype
= pushtag (name
, enumtype
, /*tag_scope=*/ts_current
);
13075 enumtype
= xref_tag (enum_type
, name
, /*tag_scope=*/ts_current
,
13078 if (enumtype
== error_mark_node
)
13079 return error_mark_node
;
13081 /* The enum is considered opaque until the opening '{' of the
13082 enumerator list. */
13083 SET_OPAQUE_ENUM_P (enumtype
, true);
13084 ENUM_FIXED_UNDERLYING_TYPE_P (enumtype
) = !! underlying_type
;
13087 SET_SCOPED_ENUM_P (enumtype
, scoped_enum_p
);
13089 if (underlying_type
)
13091 if (CP_INTEGRAL_TYPE_P (underlying_type
))
13093 copy_type_enum (enumtype
, underlying_type
);
13094 ENUM_UNDERLYING_TYPE (enumtype
) = underlying_type
;
13096 else if (dependent_type_p (underlying_type
))
13097 ENUM_UNDERLYING_TYPE (enumtype
) = underlying_type
;
13099 error ("underlying type %<%T%> of %<%T%> must be an integral type",
13100 underlying_type
, enumtype
);
13103 /* If into a template class, the returned enum is always the first
13104 declaration (opaque or not) seen. This way all the references to
13105 this type will be to the same declaration. The following ones are used
13106 only to check for definition errors. */
13107 if (prevtype
&& processing_template_decl
)
13113 /* After processing and defining all the values of an enumeration type,
13114 install their decls in the enumeration type.
13115 ENUMTYPE is the type object. */
13118 finish_enum_value_list (tree enumtype
)
13121 tree underlying_type
;
13124 tree minnode
, maxnode
;
13127 bool fixed_underlying_type_p
13128 = ENUM_UNDERLYING_TYPE (enumtype
) != NULL_TREE
;
13130 /* We built up the VALUES in reverse order. */
13131 TYPE_VALUES (enumtype
) = nreverse (TYPE_VALUES (enumtype
));
13133 /* For an enum defined in a template, just set the type of the values;
13134 all further processing is postponed until the template is
13135 instantiated. We need to set the type so that tsubst of a CONST_DECL
13137 if (processing_template_decl
)
13139 for (values
= TYPE_VALUES (enumtype
);
13141 values
= TREE_CHAIN (values
))
13142 TREE_TYPE (TREE_VALUE (values
)) = enumtype
;
13146 /* Determine the minimum and maximum values of the enumerators. */
13147 if (TYPE_VALUES (enumtype
))
13149 minnode
= maxnode
= NULL_TREE
;
13151 for (values
= TYPE_VALUES (enumtype
);
13153 values
= TREE_CHAIN (values
))
13155 decl
= TREE_VALUE (values
);
13157 /* [dcl.enum]: Following the closing brace of an enum-specifier,
13158 each enumerator has the type of its enumeration. Prior to the
13159 closing brace, the type of each enumerator is the type of its
13160 initializing value. */
13161 TREE_TYPE (decl
) = enumtype
;
13163 /* Update the minimum and maximum values, if appropriate. */
13164 value
= DECL_INITIAL (decl
);
13165 if (value
== error_mark_node
)
13166 value
= integer_zero_node
;
13167 /* Figure out what the minimum and maximum values of the
13168 enumerators are. */
13170 minnode
= maxnode
= value
;
13171 else if (tree_int_cst_lt (maxnode
, value
))
13173 else if (tree_int_cst_lt (value
, minnode
))
13180 If the enumerator-list is empty, the underlying type is as if
13181 the enumeration had a single enumerator with value 0. */
13182 minnode
= maxnode
= integer_zero_node
;
13184 if (!fixed_underlying_type_p
)
13186 /* Compute the number of bits require to represent all values of the
13187 enumeration. We must do this before the type of MINNODE and
13188 MAXNODE are transformed, since tree_int_cst_min_precision relies
13189 on the TREE_TYPE of the value it is passed. */
13190 signop sgn
= tree_int_cst_sgn (minnode
) >= 0 ? UNSIGNED
: SIGNED
;
13191 int lowprec
= tree_int_cst_min_precision (minnode
, sgn
);
13192 int highprec
= tree_int_cst_min_precision (maxnode
, sgn
);
13193 int precision
= MAX (lowprec
, highprec
);
13195 bool use_short_enum
;
13197 /* Determine the underlying type of the enumeration.
13201 The underlying type of an enumeration is an integral type that
13202 can represent all the enumerator values defined in the
13203 enumeration. It is implementation-defined which integral type is
13204 used as the underlying type for an enumeration except that the
13205 underlying type shall not be larger than int unless the value of
13206 an enumerator cannot fit in an int or unsigned int.
13208 We use "int" or an "unsigned int" as the underlying type, even if
13209 a smaller integral type would work, unless the user has
13210 explicitly requested that we use the smallest possible type. The
13211 user can request that for all enumerations with a command line
13212 flag, or for just one enumeration with an attribute. */
13214 use_short_enum
= flag_short_enums
13215 || lookup_attribute ("packed", TYPE_ATTRIBUTES (enumtype
));
13217 for (itk
= (use_short_enum
? itk_char
: itk_int
);
13221 underlying_type
= integer_types
[itk
];
13222 if (underlying_type
!= NULL_TREE
13223 && TYPE_PRECISION (underlying_type
) >= precision
13224 && TYPE_SIGN (underlying_type
) == sgn
)
13227 if (itk
== itk_none
)
13231 IF no integral type can represent all the enumerator values, the
13232 enumeration is ill-formed. */
13233 error ("no integral type can represent all of the enumerator values "
13234 "for %qT", enumtype
);
13235 precision
= TYPE_PRECISION (long_long_integer_type_node
);
13236 underlying_type
= integer_types
[itk_unsigned_long_long
];
13241 The value of sizeof() applied to an enumeration type, an object
13242 of an enumeration type, or an enumerator, is the value of sizeof()
13243 applied to the underlying type. */
13244 copy_type_enum (enumtype
, underlying_type
);
13246 /* Compute the minimum and maximum values for the type.
13250 For an enumeration where emin is the smallest enumerator and emax
13251 is the largest, the values of the enumeration are the values of the
13252 underlying type in the range bmin to bmax, where bmin and bmax are,
13253 respectively, the smallest and largest values of the smallest bit-
13254 field that can store emin and emax. */
13256 /* The middle-end currently assumes that types with TYPE_PRECISION
13257 narrower than their underlying type are suitably zero or sign
13258 extended to fill their mode. Similarly, it assumes that the front
13259 end assures that a value of a particular type must be within
13260 TYPE_MIN_VALUE and TYPE_MAX_VALUE.
13262 We used to set these fields based on bmin and bmax, but that led
13263 to invalid assumptions like optimizing away bounds checking. So
13264 now we just set the TYPE_PRECISION, TYPE_MIN_VALUE, and
13265 TYPE_MAX_VALUE to the values for the mode above and only restrict
13266 the ENUM_UNDERLYING_TYPE for the benefit of diagnostics. */
13267 ENUM_UNDERLYING_TYPE (enumtype
)
13268 = build_distinct_type_copy (underlying_type
);
13269 TYPE_PRECISION (ENUM_UNDERLYING_TYPE (enumtype
)) = precision
;
13270 set_min_and_max_values_for_integral_type
13271 (ENUM_UNDERLYING_TYPE (enumtype
), precision
, sgn
);
13273 /* If -fstrict-enums, still constrain TYPE_MIN/MAX_VALUE. */
13274 if (flag_strict_enums
)
13275 set_min_and_max_values_for_integral_type (enumtype
, precision
, sgn
);
13278 underlying_type
= ENUM_UNDERLYING_TYPE (enumtype
);
13280 /* Convert each of the enumerators to the type of the underlying
13281 type of the enumeration. */
13282 for (values
= TYPE_VALUES (enumtype
); values
; values
= TREE_CHAIN (values
))
13284 location_t saved_location
;
13286 decl
= TREE_VALUE (values
);
13287 saved_location
= input_location
;
13288 input_location
= DECL_SOURCE_LOCATION (decl
);
13289 if (fixed_underlying_type_p
)
13290 /* If the enumeration type has a fixed underlying type, we
13291 already checked all of the enumerator values. */
13292 value
= DECL_INITIAL (decl
);
13294 value
= perform_implicit_conversion (underlying_type
,
13295 DECL_INITIAL (decl
),
13296 tf_warning_or_error
);
13297 input_location
= saved_location
;
13299 /* Do not clobber shared ints. */
13300 value
= copy_node (value
);
13302 TREE_TYPE (value
) = enumtype
;
13303 DECL_INITIAL (decl
) = value
;
13306 /* Fix up all variant types of this enum type. */
13307 for (t
= TYPE_MAIN_VARIANT (enumtype
); t
; t
= TYPE_NEXT_VARIANT (t
))
13308 TYPE_VALUES (t
) = TYPE_VALUES (enumtype
);
13310 if (at_class_scope_p ()
13311 && COMPLETE_TYPE_P (current_class_type
)
13312 && UNSCOPED_ENUM_P (enumtype
))
13313 insert_late_enum_def_into_classtype_sorted_fields (enumtype
,
13314 current_class_type
);
13316 /* Finish debugging output for this type. */
13317 rest_of_type_compilation (enumtype
, namespace_bindings_p ());
13320 /* Finishes the enum type. This is called only the first time an
13321 enumeration is seen, be it opaque or odinary.
13322 ENUMTYPE is the type object. */
13325 finish_enum (tree enumtype
)
13327 if (processing_template_decl
)
13329 if (at_function_scope_p ())
13330 add_stmt (build_min (TAG_DEFN
, enumtype
));
13334 /* If this is a forward declaration, there should not be any variants,
13335 though we can get a variant in the middle of an enum-specifier with
13336 wacky code like 'enum E { e = sizeof(const E*) };' */
13337 gcc_assert (enumtype
== TYPE_MAIN_VARIANT (enumtype
)
13338 && (TYPE_VALUES (enumtype
)
13339 || !TYPE_NEXT_VARIANT (enumtype
)));
13342 /* Build and install a CONST_DECL for an enumeration constant of the
13343 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
13344 Apply ATTRIBUTES if available. LOC is the location of NAME.
13345 Assignment of sequential values by default is handled here. */
13348 build_enumerator (tree name
, tree value
, tree enumtype
, tree attributes
,
13355 /* scalar_constant_value will pull out this expression, so make sure
13356 it's folded as appropriate. */
13357 if (processing_template_decl
)
13358 value
= fold_non_dependent_expr (value
);
13360 /* If the VALUE was erroneous, pretend it wasn't there; that will
13361 result in the enum being assigned the next value in sequence. */
13362 if (value
== error_mark_node
)
13365 /* Remove no-op casts from the value. */
13367 STRIP_TYPE_NOPS (value
);
13369 if (! processing_template_decl
)
13371 /* Validate and default VALUE. */
13372 if (value
!= NULL_TREE
)
13374 if (!ENUM_UNDERLYING_TYPE (enumtype
))
13376 tree tmp_value
= build_expr_type_conversion (WANT_INT
| WANT_ENUM
,
13381 else if (! INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P
13382 (TREE_TYPE (value
)))
13383 value
= perform_implicit_conversion_flags
13384 (ENUM_UNDERLYING_TYPE (enumtype
), value
, tf_warning_or_error
,
13385 LOOKUP_IMPLICIT
| LOOKUP_NO_NARROWING
);
13387 if (value
== error_mark_node
)
13390 if (value
!= NULL_TREE
)
13392 value
= cxx_constant_value (value
);
13394 if (TREE_CODE (value
) != INTEGER_CST
13395 || ! INTEGRAL_OR_ENUMERATION_TYPE_P (TREE_TYPE (value
)))
13397 error ("enumerator value for %qD is not an integer constant",
13404 /* Default based on previous value. */
13405 if (value
== NULL_TREE
)
13407 if (TYPE_VALUES (enumtype
))
13412 /* C++03 7.2/4: If no initializer is specified for the first
13413 enumerator, the type is an unspecified integral
13414 type. Otherwise the type is the same as the type of the
13415 initializing value of the preceding enumerator unless the
13416 incremented value is not representable in that type, in
13417 which case the type is an unspecified integral type
13418 sufficient to contain the incremented value. */
13419 prev_value
= DECL_INITIAL (TREE_VALUE (TYPE_VALUES (enumtype
)));
13420 if (error_operand_p (prev_value
))
13421 value
= error_mark_node
;
13424 tree type
= TREE_TYPE (prev_value
);
13425 signop sgn
= TYPE_SIGN (type
);
13426 widest_int wi
= wi::add (wi::to_widest (prev_value
), 1, sgn
,
13430 bool pos
= !wi::neg_p (wi
, sgn
);
13431 if (!wi::fits_to_tree_p (wi
, type
))
13434 for (itk
= itk_int
; itk
!= itk_none
; itk
++)
13436 type
= integer_types
[itk
];
13437 if (type
!= NULL_TREE
13438 && (pos
|| !TYPE_UNSIGNED (type
))
13439 && wi::fits_to_tree_p (wi
, type
))
13442 if (type
&& cxx_dialect
< cxx11
13443 && itk
> itk_unsigned_long
)
13444 pedwarn (input_location
, OPT_Wlong_long
, pos
? "\
13445 incremented enumerator value is too large for %<unsigned long%>" : "\
13446 incremented enumerator value is too large for %<long%>");
13448 if (type
== NULL_TREE
)
13451 value
= wide_int_to_tree (type
, wi
);
13456 error ("overflow in enumeration values at %qD", name
);
13457 value
= error_mark_node
;
13462 value
= integer_zero_node
;
13465 /* Remove no-op casts from the value. */
13466 STRIP_TYPE_NOPS (value
);
13468 /* If the underlying type of the enum is fixed, check whether
13469 the enumerator values fits in the underlying type. If it
13470 does not fit, the program is ill-formed [C++0x dcl.enum]. */
13471 if (ENUM_UNDERLYING_TYPE (enumtype
)
13473 && TREE_CODE (value
) == INTEGER_CST
)
13475 if (!int_fits_type_p (value
, ENUM_UNDERLYING_TYPE (enumtype
)))
13476 error ("enumerator value %E is outside the range of underlying "
13477 "type %<%T%>", value
, ENUM_UNDERLYING_TYPE (enumtype
));
13479 /* Convert the value to the appropriate type. */
13480 value
= convert (ENUM_UNDERLYING_TYPE (enumtype
), value
);
13484 /* C++ associates enums with global, function, or class declarations. */
13485 context
= current_scope ();
13487 /* Build the actual enumeration constant. Note that the enumeration
13488 constants have the underlying type of the enum (if it is fixed)
13489 or the type of their initializer (if the underlying type of the
13490 enum is not fixed):
13494 If the underlying type is fixed, the type of each enumerator
13495 prior to the closing brace is the underlying type; if the
13496 initializing value of an enumerator cannot be represented by
13497 the underlying type, the program is ill-formed. If the
13498 underlying type is not fixed, the type of each enumerator is
13499 the type of its initializing value.
13501 If the underlying type is not fixed, it will be computed by
13502 finish_enum and we will reset the type of this enumerator. Of
13503 course, if we're processing a template, there may be no value. */
13504 type
= value
? TREE_TYPE (value
) : NULL_TREE
;
13506 decl
= build_decl (loc
, CONST_DECL
, name
, type
);
13508 DECL_CONTEXT (decl
) = enumtype
;
13509 TREE_CONSTANT (decl
) = 1;
13510 TREE_READONLY (decl
) = 1;
13511 DECL_INITIAL (decl
) = value
;
13514 cplus_decl_attributes (&decl
, attributes
, 0);
13516 if (context
&& context
== current_class_type
&& !SCOPED_ENUM_P (enumtype
))
13517 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
13518 on the TYPE_FIELDS list for `S'. (That's so that you can say
13519 things like `S::i' later.) */
13520 finish_member_declaration (decl
);
13524 /* Add this enumeration constant to the list for this type. */
13525 TYPE_VALUES (enumtype
) = tree_cons (name
, decl
, TYPE_VALUES (enumtype
));
13528 /* Look for an enumerator with the given NAME within the enumeration
13529 type ENUMTYPE. This routine is used primarily for qualified name
13530 lookup into an enumerator in C++0x, e.g.,
13532 enum class Color { Red, Green, Blue };
13534 Color color = Color::Red;
13536 Returns the value corresponding to the enumerator, or
13537 NULL_TREE if no such enumerator was found. */
13539 lookup_enumerator (tree enumtype
, tree name
)
13542 gcc_assert (enumtype
&& TREE_CODE (enumtype
) == ENUMERAL_TYPE
);
13544 e
= purpose_member (name
, TYPE_VALUES (enumtype
));
13545 return e
? TREE_VALUE (e
) : NULL_TREE
;
13549 /* We're defining DECL. Make sure that its type is OK. */
13552 check_function_type (tree decl
, tree current_function_parms
)
13554 tree fntype
= TREE_TYPE (decl
);
13555 tree return_type
= complete_type (TREE_TYPE (fntype
));
13557 /* In a function definition, arg types must be complete. */
13558 require_complete_types_for_parms (current_function_parms
);
13560 if (dependent_type_p (return_type
)
13561 || type_uses_auto (return_type
))
13563 if (!COMPLETE_OR_VOID_TYPE_P (return_type
)
13564 || (TYPE_FOR_JAVA (return_type
) && MAYBE_CLASS_TYPE_P (return_type
)))
13566 tree args
= TYPE_ARG_TYPES (fntype
);
13568 if (!COMPLETE_OR_VOID_TYPE_P (return_type
))
13569 error ("return type %q#T is incomplete", return_type
);
13571 error ("return type has Java class type %q#T", return_type
);
13573 /* Make it return void instead. */
13574 if (TREE_CODE (fntype
) == METHOD_TYPE
)
13575 fntype
= build_method_type_directly (TREE_TYPE (TREE_VALUE (args
)),
13577 TREE_CHAIN (args
));
13579 fntype
= build_function_type (void_type_node
, args
);
13581 = build_exception_variant (fntype
,
13582 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (decl
)));
13583 fntype
= (cp_build_type_attribute_variant
13584 (fntype
, TYPE_ATTRIBUTES (TREE_TYPE (decl
))));
13585 TREE_TYPE (decl
) = fntype
;
13588 abstract_virtuals_error (decl
, TREE_TYPE (fntype
));
13591 /* Create the FUNCTION_DECL for a function definition.
13592 DECLSPECS and DECLARATOR are the parts of the declaration;
13593 they describe the function's name and the type it returns,
13594 but twisted together in a fashion that parallels the syntax of C.
13596 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
13597 DECLARATOR is really the DECL for the function we are about to
13598 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
13599 indicating that the function is an inline defined in-class.
13601 This function creates a binding context for the function body
13602 as well as setting up the FUNCTION_DECL in current_function_decl.
13604 For C++, we must first check whether that datum makes any sense.
13605 For example, "class A local_a(1,2);" means that variable local_a
13606 is an aggregate of type A, which should have a constructor
13607 applied to it with the argument list [1, 2].
13609 On entry, DECL_INITIAL (decl1) should be NULL_TREE or error_mark_node,
13610 or may be a BLOCK if the function has been defined previously
13611 in this translation unit. On exit, DECL_INITIAL (decl1) will be
13612 error_mark_node if the function has never been defined, or
13613 a BLOCK if the function has been defined somewhere. */
13616 start_preparsed_function (tree decl1
, tree attrs
, int flags
)
13618 tree ctype
= NULL_TREE
;
13621 int doing_friend
= 0;
13622 cp_binding_level
*bl
;
13623 tree current_function_parms
;
13624 struct c_fileinfo
*finfo
13625 = get_fileinfo (LOCATION_FILE (DECL_SOURCE_LOCATION (decl1
)));
13626 bool honor_interface
;
13628 /* Sanity check. */
13629 gcc_assert (VOID_TYPE_P (TREE_VALUE (void_list_node
)));
13630 gcc_assert (TREE_CHAIN (void_list_node
) == NULL_TREE
);
13632 fntype
= TREE_TYPE (decl1
);
13633 if (TREE_CODE (fntype
) == METHOD_TYPE
)
13634 ctype
= TYPE_METHOD_BASETYPE (fntype
);
13636 /* ISO C++ 11.4/5. A friend function defined in a class is in
13637 the (lexical) scope of the class in which it is defined. */
13638 if (!ctype
&& DECL_FRIEND_P (decl1
))
13640 ctype
= DECL_FRIEND_CONTEXT (decl1
);
13642 /* CTYPE could be null here if we're dealing with a template;
13643 for example, `inline friend float foo()' inside a template
13644 will have no CTYPE set. */
13645 if (ctype
&& TREE_CODE (ctype
) != RECORD_TYPE
)
13651 if (DECL_DECLARED_INLINE_P (decl1
)
13652 && lookup_attribute ("noinline", attrs
))
13653 warning_at (DECL_SOURCE_LOCATION (decl1
), 0,
13654 "inline function %qD given attribute noinline", decl1
);
13656 /* Handle gnu_inline attribute. */
13657 if (GNU_INLINE_P (decl1
))
13659 DECL_EXTERNAL (decl1
) = 1;
13660 DECL_NOT_REALLY_EXTERN (decl1
) = 0;
13661 DECL_INTERFACE_KNOWN (decl1
) = 1;
13662 DECL_DISREGARD_INLINE_LIMITS (decl1
) = 1;
13665 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl1
))
13666 /* This is a constructor, we must ensure that any default args
13667 introduced by this definition are propagated to the clones
13668 now. The clones are used directly in overload resolution. */
13669 adjust_clone_args (decl1
);
13671 /* Sometimes we don't notice that a function is a static member, and
13672 build a METHOD_TYPE for it. Fix that up now. */
13673 gcc_assert (!(ctype
!= NULL_TREE
&& DECL_STATIC_FUNCTION_P (decl1
)
13674 && TREE_CODE (TREE_TYPE (decl1
)) == METHOD_TYPE
));
13676 /* Set up current_class_type, and enter the scope of the class, if
13679 push_nested_class (ctype
);
13680 else if (DECL_STATIC_FUNCTION_P (decl1
))
13681 push_nested_class (DECL_CONTEXT (decl1
));
13683 /* Now that we have entered the scope of the class, we must restore
13684 the bindings for any template parameters surrounding DECL1, if it
13685 is an inline member template. (Order is important; consider the
13686 case where a template parameter has the same name as a field of
13687 the class.) It is not until after this point that
13688 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
13689 if (flags
& SF_INCLASS_INLINE
)
13690 maybe_begin_member_template_processing (decl1
);
13692 /* Effective C++ rule 15. */
13694 && DECL_OVERLOADED_OPERATOR_P (decl1
) == NOP_EXPR
13695 && VOID_TYPE_P (TREE_TYPE (fntype
)))
13696 warning (OPT_Weffc__
, "%<operator=%> should return a reference to %<*this%>");
13698 /* Make the init_value nonzero so pushdecl knows this is not tentative.
13699 error_mark_node is replaced below (in poplevel) with the BLOCK. */
13700 if (!DECL_INITIAL (decl1
))
13701 DECL_INITIAL (decl1
) = error_mark_node
;
13703 /* This function exists in static storage.
13704 (This does not mean `static' in the C sense!) */
13705 TREE_STATIC (decl1
) = 1;
13707 /* We must call push_template_decl after current_class_type is set
13708 up. (If we are processing inline definitions after exiting a
13709 class scope, current_class_type will be NULL_TREE until set above
13710 by push_nested_class.) */
13711 if (processing_template_decl
)
13713 tree newdecl1
= push_template_decl (decl1
);
13714 if (newdecl1
== error_mark_node
)
13716 if (ctype
|| DECL_STATIC_FUNCTION_P (decl1
))
13717 pop_nested_class ();
13723 /* We are now in the scope of the function being defined. */
13724 current_function_decl
= decl1
;
13726 /* Save the parm names or decls from this function's declarator
13727 where store_parm_decls will find them. */
13728 current_function_parms
= DECL_ARGUMENTS (decl1
);
13730 /* Make sure the parameter and return types are reasonable. When
13731 you declare a function, these types can be incomplete, but they
13732 must be complete when you define the function. */
13733 check_function_type (decl1
, current_function_parms
);
13735 /* Build the return declaration for the function. */
13736 restype
= TREE_TYPE (fntype
);
13738 if (DECL_RESULT (decl1
) == NULL_TREE
)
13742 resdecl
= build_decl (input_location
, RESULT_DECL
, 0, restype
);
13743 DECL_ARTIFICIAL (resdecl
) = 1;
13744 DECL_IGNORED_P (resdecl
) = 1;
13745 DECL_RESULT (decl1
) = resdecl
;
13747 cp_apply_type_quals_to_decl (cp_type_quals (restype
), resdecl
);
13750 /* Let the user know we're compiling this function. */
13751 announce_function (decl1
);
13753 /* Record the decl so that the function name is defined.
13754 If we already have a decl for this name, and it is a FUNCTION_DECL,
13755 use the old decl. */
13756 if (!processing_template_decl
&& !(flags
& SF_PRE_PARSED
))
13758 /* A specialization is not used to guide overload resolution. */
13759 if (!DECL_FUNCTION_MEMBER_P (decl1
)
13760 && !(DECL_USE_TEMPLATE (decl1
) &&
13761 PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl1
))))
13763 tree olddecl
= pushdecl (decl1
);
13765 if (olddecl
== error_mark_node
)
13766 /* If something went wrong when registering the declaration,
13767 use DECL1; we have to have a FUNCTION_DECL to use when
13768 parsing the body of the function. */
13772 /* Otherwise, OLDDECL is either a previous declaration
13773 of the same function or DECL1 itself. */
13775 if (warn_missing_declarations
13776 && olddecl
== decl1
13777 && !DECL_MAIN_P (decl1
)
13778 && TREE_PUBLIC (decl1
)
13779 && !DECL_DECLARED_INLINE_P (decl1
))
13783 /* Check whether DECL1 is in an anonymous
13785 for (context
= DECL_CONTEXT (decl1
);
13787 context
= DECL_CONTEXT (context
))
13789 if (TREE_CODE (context
) == NAMESPACE_DECL
13790 && DECL_NAME (context
) == NULL_TREE
)
13794 if (context
== NULL
)
13795 warning_at (DECL_SOURCE_LOCATION (decl1
),
13796 OPT_Wmissing_declarations
,
13797 "no previous declaration for %qD", decl1
);
13805 /* We need to set the DECL_CONTEXT. */
13806 if (!DECL_CONTEXT (decl1
) && DECL_TEMPLATE_INFO (decl1
))
13807 DECL_CONTEXT (decl1
) = DECL_CONTEXT (DECL_TI_TEMPLATE (decl1
));
13809 fntype
= TREE_TYPE (decl1
);
13810 restype
= TREE_TYPE (fntype
);
13812 /* If #pragma weak applies, mark the decl appropriately now.
13813 The pragma only applies to global functions. Because
13814 determining whether or not the #pragma applies involves
13815 computing the mangled name for the declaration, we cannot
13816 apply the pragma until after we have merged this declaration
13817 with any previous declarations; if the original declaration
13818 has a linkage specification, that specification applies to
13819 the definition as well, and may affect the mangled name. */
13820 if (DECL_FILE_SCOPE_P (decl1
))
13821 maybe_apply_pragma_weak (decl1
);
13824 /* Reset this in case the call to pushdecl changed it. */
13825 current_function_decl
= decl1
;
13827 gcc_assert (DECL_INITIAL (decl1
));
13829 /* This function may already have been parsed, in which case just
13830 return; our caller will skip over the body without parsing. */
13831 if (DECL_INITIAL (decl1
) != error_mark_node
)
13834 /* Initialize RTL machinery. We cannot do this until
13835 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
13836 even when processing a template; this is how we get
13837 CFUN set up, and our per-function variables initialized.
13838 FIXME factor out the non-RTL stuff. */
13839 bl
= current_binding_level
;
13840 allocate_struct_function (decl1
, processing_template_decl
);
13842 /* Initialize the language data structures. Whenever we start
13843 a new function, we destroy temporaries in the usual way. */
13844 cfun
->language
= ggc_cleared_alloc
<language_function
> ();
13845 current_stmt_tree ()->stmts_are_full_exprs_p
= 1;
13846 current_binding_level
= bl
;
13848 if (!processing_template_decl
&& type_uses_auto (restype
))
13850 FNDECL_USED_AUTO (decl1
) = true;
13851 current_function_auto_return_pattern
= restype
;
13854 /* Start the statement-tree, start the tree now. */
13855 DECL_SAVED_TREE (decl1
) = push_stmt_list ();
13857 /* If we are (erroneously) defining a function that we have already
13858 defined before, wipe out what we knew before. */
13859 if (!DECL_PENDING_INLINE_P (decl1
))
13860 DECL_SAVED_FUNCTION_DATA (decl1
) = NULL
;
13862 if (ctype
&& !doing_friend
&& !DECL_STATIC_FUNCTION_P (decl1
))
13864 /* We know that this was set up by `grokclassfn'. We do not
13865 wait until `store_parm_decls', since evil parse errors may
13866 never get us to that point. Here we keep the consistency
13867 between `current_class_type' and `current_class_ptr'. */
13868 tree t
= DECL_ARGUMENTS (decl1
);
13870 gcc_assert (t
!= NULL_TREE
&& TREE_CODE (t
) == PARM_DECL
);
13871 gcc_assert (TYPE_PTR_P (TREE_TYPE (t
)));
13873 cp_function_chain
->x_current_class_ref
13874 = cp_build_indirect_ref (t
, RO_NULL
, tf_warning_or_error
);
13875 /* Set this second to avoid shortcut in cp_build_indirect_ref. */
13876 cp_function_chain
->x_current_class_ptr
= t
;
13878 /* Constructors and destructors need to know whether they're "in
13879 charge" of initializing virtual base classes. */
13880 t
= DECL_CHAIN (t
);
13881 if (DECL_HAS_IN_CHARGE_PARM_P (decl1
))
13883 current_in_charge_parm
= t
;
13884 t
= DECL_CHAIN (t
);
13886 if (DECL_HAS_VTT_PARM_P (decl1
))
13888 gcc_assert (DECL_NAME (t
) == vtt_parm_identifier
);
13889 current_vtt_parm
= t
;
13893 honor_interface
= (!DECL_TEMPLATE_INSTANTIATION (decl1
)
13894 /* Implicitly-defined methods (like the
13895 destructor for a class in which no destructor
13896 is explicitly declared) must not be defined
13897 until their definition is needed. So, we
13898 ignore interface specifications for
13899 compiler-generated functions. */
13900 && !DECL_ARTIFICIAL (decl1
));
13902 if (processing_template_decl
)
13903 /* Don't mess with interface flags. */;
13904 else if (DECL_INTERFACE_KNOWN (decl1
))
13906 tree ctx
= decl_function_context (decl1
);
13908 if (DECL_NOT_REALLY_EXTERN (decl1
))
13909 DECL_EXTERNAL (decl1
) = 0;
13911 if (ctx
!= NULL_TREE
&& vague_linkage_p (ctx
))
13912 /* This is a function in a local class in an extern inline
13913 or template function. */
13914 comdat_linkage (decl1
);
13916 /* If this function belongs to an interface, it is public.
13917 If it belongs to someone else's interface, it is also external.
13918 This only affects inlines and template instantiations. */
13919 else if (!finfo
->interface_unknown
&& honor_interface
)
13921 if (DECL_DECLARED_INLINE_P (decl1
)
13922 || DECL_TEMPLATE_INSTANTIATION (decl1
))
13924 DECL_EXTERNAL (decl1
)
13925 = (finfo
->interface_only
13926 || (DECL_DECLARED_INLINE_P (decl1
)
13927 && ! flag_implement_inlines
13928 && !DECL_VINDEX (decl1
)));
13930 /* For WIN32 we also want to put these in linkonce sections. */
13931 maybe_make_one_only (decl1
);
13934 DECL_EXTERNAL (decl1
) = 0;
13935 DECL_INTERFACE_KNOWN (decl1
) = 1;
13936 /* If this function is in an interface implemented in this file,
13937 make sure that the back end knows to emit this function
13939 if (!DECL_EXTERNAL (decl1
))
13940 mark_needed (decl1
);
13942 else if (finfo
->interface_unknown
&& finfo
->interface_only
13943 && honor_interface
)
13945 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
13946 interface, we will have both finfo->interface_unknown and
13947 finfo->interface_only set. In that case, we don't want to
13948 use the normal heuristics because someone will supply a
13949 #pragma implementation elsewhere, and deducing it here would
13950 produce a conflict. */
13951 comdat_linkage (decl1
);
13952 DECL_EXTERNAL (decl1
) = 0;
13953 DECL_INTERFACE_KNOWN (decl1
) = 1;
13954 DECL_DEFER_OUTPUT (decl1
) = 1;
13958 /* This is a definition, not a reference.
13959 So clear DECL_EXTERNAL, unless this is a GNU extern inline. */
13960 if (!GNU_INLINE_P (decl1
))
13961 DECL_EXTERNAL (decl1
) = 0;
13963 if ((DECL_DECLARED_INLINE_P (decl1
)
13964 || DECL_TEMPLATE_INSTANTIATION (decl1
))
13965 && ! DECL_INTERFACE_KNOWN (decl1
))
13966 DECL_DEFER_OUTPUT (decl1
) = 1;
13968 DECL_INTERFACE_KNOWN (decl1
) = 1;
13971 /* Determine the ELF visibility attribute for the function. We must not
13972 do this before calling "pushdecl", as we must allow "duplicate_decls"
13973 to merge any attributes appropriately. We also need to wait until
13975 if (!DECL_CLONED_FUNCTION_P (decl1
))
13976 determine_visibility (decl1
);
13978 if (!processing_template_decl
)
13979 maybe_instantiate_noexcept (decl1
);
13981 begin_scope (sk_function_parms
, decl1
);
13985 if (DECL_DESTRUCTOR_P (decl1
)
13986 || (DECL_CONSTRUCTOR_P (decl1
)
13987 && targetm
.cxx
.cdtor_returns_this ()))
13989 cdtor_label
= create_artificial_label (input_location
);
13992 start_fname_decls ();
13994 store_parm_decls (current_function_parms
);
13996 if (!processing_template_decl
13997 && flag_lifetime_dse
&& DECL_CONSTRUCTOR_P (decl1
))
13999 /* Insert a clobber to let the back end know that the object storage
14000 is dead when we enter the constructor. */
14001 tree btype
= CLASSTYPE_AS_BASE (current_class_type
);
14002 tree clobber
= build_constructor (btype
, NULL
);
14003 TREE_THIS_VOLATILE (clobber
) = true;
14004 tree bref
= build_nop (build_reference_type (btype
), current_class_ptr
);
14005 bref
= convert_from_reference (bref
);
14006 tree exprstmt
= build2 (MODIFY_EXPR
, btype
, bref
, clobber
);
14007 finish_expr_stmt (exprstmt
);
14014 /* Like start_preparsed_function, except that instead of a
14015 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
14017 Returns true on success. If the DECLARATOR is not suitable
14018 for a function, we return false, which tells the parser to
14019 skip the entire function. */
14022 start_function (cp_decl_specifier_seq
*declspecs
,
14023 const cp_declarator
*declarator
,
14028 decl1
= grokdeclarator (declarator
, declspecs
, FUNCDEF
, 1, &attrs
);
14029 invoke_plugin_callbacks (PLUGIN_START_PARSE_FUNCTION
, decl1
);
14030 if (decl1
== error_mark_node
)
14032 /* If the declarator is not suitable for a function definition,
14033 cause a syntax error. */
14034 if (decl1
== NULL_TREE
|| TREE_CODE (decl1
) != FUNCTION_DECL
)
14036 error ("invalid function declaration");
14040 if (DECL_MAIN_P (decl1
))
14041 /* main must return int. grokfndecl should have corrected it
14042 (and issued a diagnostic) if the user got it wrong. */
14043 gcc_assert (same_type_p (TREE_TYPE (TREE_TYPE (decl1
)),
14044 integer_type_node
));
14046 return start_preparsed_function (decl1
, attrs
, /*flags=*/SF_DEFAULT
);
14049 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
14053 use_eh_spec_block (tree fn
)
14055 return (flag_exceptions
&& flag_enforce_eh_specs
14056 && !processing_template_decl
14057 && !type_throw_all_p (TREE_TYPE (fn
))
14058 /* We insert the EH_SPEC_BLOCK only in the original
14059 function; then, it is copied automatically to the
14061 && !DECL_CLONED_FUNCTION_P (fn
)
14062 /* Implicitly-generated constructors and destructors have
14063 exception specifications. However, those specifications
14064 are the union of the possible exceptions specified by the
14065 constructors/destructors for bases and members, so no
14066 unallowed exception will ever reach this function. By
14067 not creating the EH_SPEC_BLOCK we save a little memory,
14068 and we avoid spurious warnings about unreachable
14070 && !DECL_DEFAULTED_FN (fn
));
14073 /* Store the parameter declarations into the current function declaration.
14074 This is called after parsing the parameter declarations, before
14075 digesting the body of the function.
14077 Also install to binding contour return value identifier, if any. */
14080 store_parm_decls (tree current_function_parms
)
14082 tree fndecl
= current_function_decl
;
14085 /* This is a chain of any other decls that came in among the parm
14086 declarations. If a parm is declared with enum {foo, bar} x;
14087 then CONST_DECLs for foo and bar are put here. */
14088 tree nonparms
= NULL_TREE
;
14090 if (current_function_parms
)
14092 /* This case is when the function was defined with an ANSI prototype.
14093 The parms already have decls, so we need not do anything here
14094 except record them as in effect
14095 and complain if any redundant old-style parm decls were written. */
14097 tree specparms
= current_function_parms
;
14100 /* Must clear this because it might contain TYPE_DECLs declared
14102 current_binding_level
->names
= NULL
;
14104 /* If we're doing semantic analysis, then we'll call pushdecl
14105 for each of these. We must do them in reverse order so that
14106 they end in the correct forward order. */
14107 specparms
= nreverse (specparms
);
14109 for (parm
= specparms
; parm
; parm
= next
)
14111 next
= DECL_CHAIN (parm
);
14112 if (TREE_CODE (parm
) == PARM_DECL
)
14114 if (DECL_NAME (parm
) == NULL_TREE
14115 || !VOID_TYPE_P (parm
))
14118 error ("parameter %qD declared void", parm
);
14122 /* If we find an enum constant or a type tag,
14123 put it aside for the moment. */
14124 TREE_CHAIN (parm
) = NULL_TREE
;
14125 nonparms
= chainon (nonparms
, parm
);
14129 /* Get the decls in their original chain order and record in the
14130 function. This is all and only the PARM_DECLs that were
14131 pushed into scope by the loop above. */
14132 DECL_ARGUMENTS (fndecl
) = getdecls ();
14135 DECL_ARGUMENTS (fndecl
) = NULL_TREE
;
14137 /* Now store the final chain of decls for the arguments
14138 as the decl-chain of the current lexical scope.
14139 Put the enumerators in as well, at the front so that
14140 DECL_ARGUMENTS is not modified. */
14141 current_binding_level
->names
= chainon (nonparms
, DECL_ARGUMENTS (fndecl
));
14143 if (use_eh_spec_block (current_function_decl
))
14144 current_eh_spec_block
= begin_eh_spec_block ();
14148 /* We have finished doing semantic analysis on DECL, but have not yet
14149 generated RTL for its body. Save away our current state, so that
14150 when we want to generate RTL later we know what to do. */
14153 save_function_data (tree decl
)
14155 struct language_function
*f
;
14157 /* Save the language-specific per-function data so that we can
14158 get it back when we really expand this function. */
14159 gcc_assert (!DECL_PENDING_INLINE_P (decl
));
14162 f
= ggc_alloc
<language_function
> ();
14163 memcpy (f
, cp_function_chain
, sizeof (struct language_function
));
14164 DECL_SAVED_FUNCTION_DATA (decl
) = f
;
14166 /* Clear out the bits we don't need. */
14167 f
->base
.x_stmt_tree
.x_cur_stmt_list
= NULL
;
14168 f
->bindings
= NULL
;
14169 f
->x_local_names
= NULL
;
14170 f
->base
.local_typedefs
= NULL
;
14174 /* Set the return value of the constructor (if present). */
14177 finish_constructor_body (void)
14182 if (targetm
.cxx
.cdtor_returns_this ()
14183 && (! TYPE_FOR_JAVA (current_class_type
)))
14185 /* Any return from a constructor will end up here. */
14186 add_stmt (build_stmt (input_location
, LABEL_EXPR
, cdtor_label
));
14188 val
= DECL_ARGUMENTS (current_function_decl
);
14189 val
= build2 (MODIFY_EXPR
, TREE_TYPE (val
),
14190 DECL_RESULT (current_function_decl
), val
);
14191 /* Return the address of the object. */
14192 exprstmt
= build_stmt (input_location
, RETURN_EXPR
, val
);
14193 add_stmt (exprstmt
);
14197 /* Do all the processing for the beginning of a destructor; set up the
14198 vtable pointers and cleanups for bases and members. */
14201 begin_destructor_body (void)
14203 tree compound_stmt
;
14205 /* If the CURRENT_CLASS_TYPE is incomplete, we will have already
14206 issued an error message. We still want to try to process the
14207 body of the function, but initialize_vtbl_ptrs will crash if
14208 TYPE_BINFO is NULL. */
14209 if (COMPLETE_TYPE_P (current_class_type
))
14211 compound_stmt
= begin_compound_stmt (0);
14212 /* Make all virtual function table pointers in non-virtual base
14213 classes point to CURRENT_CLASS_TYPE's virtual function
14215 initialize_vtbl_ptrs (current_class_ptr
);
14216 finish_compound_stmt (compound_stmt
);
14218 if (flag_lifetime_dse
)
14220 /* Insert a cleanup to let the back end know that the object is dead
14221 when we exit the destructor, either normally or via exception. */
14222 tree btype
= CLASSTYPE_AS_BASE (current_class_type
);
14223 tree clobber
= build_constructor (btype
, NULL
);
14224 TREE_THIS_VOLATILE (clobber
) = true;
14225 tree bref
= build_nop (build_reference_type (btype
),
14226 current_class_ptr
);
14227 bref
= convert_from_reference (bref
);
14228 tree exprstmt
= build2 (MODIFY_EXPR
, btype
, bref
, clobber
);
14229 finish_decl_cleanup (NULL_TREE
, exprstmt
);
14232 /* And insert cleanups for our bases and members so that they
14233 will be properly destroyed if we throw. */
14234 push_base_cleanups ();
14238 /* At the end of every destructor we generate code to delete the object if
14239 necessary. Do that now. */
14242 finish_destructor_body (void)
14246 /* Any return from a destructor will end up here; that way all base
14247 and member cleanups will be run when the function returns. */
14248 add_stmt (build_stmt (input_location
, LABEL_EXPR
, cdtor_label
));
14250 /* In a virtual destructor, we must call delete. */
14251 if (DECL_VIRTUAL_P (current_function_decl
))
14254 tree virtual_size
= cxx_sizeof (current_class_type
);
14258 At the point of definition of a virtual destructor (including
14259 an implicit definition), non-placement operator delete shall
14260 be looked up in the scope of the destructor's class and if
14261 found shall be accessible and unambiguous. */
14262 exprstmt
= build_op_delete_call (DELETE_EXPR
, current_class_ptr
,
14264 /*global_p=*/false,
14265 /*placement=*/NULL_TREE
,
14266 /*alloc_fn=*/NULL_TREE
,
14267 tf_warning_or_error
);
14269 if_stmt
= begin_if_stmt ();
14270 finish_if_stmt_cond (build2 (BIT_AND_EXPR
, integer_type_node
,
14271 current_in_charge_parm
,
14274 finish_expr_stmt (exprstmt
);
14275 finish_then_clause (if_stmt
);
14276 finish_if_stmt (if_stmt
);
14279 if (targetm
.cxx
.cdtor_returns_this ())
14283 val
= DECL_ARGUMENTS (current_function_decl
);
14284 val
= build2 (MODIFY_EXPR
, TREE_TYPE (val
),
14285 DECL_RESULT (current_function_decl
), val
);
14286 /* Return the address of the object. */
14287 exprstmt
= build_stmt (input_location
, RETURN_EXPR
, val
);
14288 add_stmt (exprstmt
);
14292 /* Do the necessary processing for the beginning of a function body, which
14293 in this case includes member-initializers, but not the catch clauses of
14294 a function-try-block. Currently, this means opening a binding level
14295 for the member-initializers (in a ctor), member cleanups (in a dtor),
14296 and capture proxies (in a lambda operator()). */
14299 begin_function_body (void)
14303 if (! FUNCTION_NEEDS_BODY_BLOCK (current_function_decl
))
14306 if (processing_template_decl
)
14307 /* Do nothing now. */;
14309 /* Always keep the BLOCK node associated with the outermost pair of
14310 curly braces of a function. These are needed for correct
14311 operation of dwarfout.c. */
14312 keep_next_level (true);
14314 stmt
= begin_compound_stmt (BCS_FN_BODY
);
14316 if (processing_template_decl
)
14317 /* Do nothing now. */;
14318 else if (DECL_DESTRUCTOR_P (current_function_decl
))
14319 begin_destructor_body ();
14324 /* Do the processing for the end of a function body. Currently, this means
14325 closing out the cleanups for fully-constructed bases and members, and in
14326 the case of the destructor, deleting the object if desired. Again, this
14327 is only meaningful for [cd]tors, since they are the only functions where
14328 there is a significant distinction between the main body and any
14329 function catch clauses. Handling, say, main() return semantics here
14330 would be wrong, as flowing off the end of a function catch clause for
14331 main() would also need to return 0. */
14334 finish_function_body (tree compstmt
)
14336 if (compstmt
== NULL_TREE
)
14339 /* Close the block. */
14340 finish_compound_stmt (compstmt
);
14342 if (processing_template_decl
)
14343 /* Do nothing now. */;
14344 else if (DECL_CONSTRUCTOR_P (current_function_decl
))
14345 finish_constructor_body ();
14346 else if (DECL_DESTRUCTOR_P (current_function_decl
))
14347 finish_destructor_body ();
14350 /* Given a function, returns the BLOCK corresponding to the outermost level
14351 of curly braces, skipping the artificial block created for constructor
14355 outer_curly_brace_block (tree fndecl
)
14357 tree block
= DECL_INITIAL (fndecl
);
14358 if (BLOCK_OUTER_CURLY_BRACE_P (block
))
14360 block
= BLOCK_SUBBLOCKS (block
);
14361 if (BLOCK_OUTER_CURLY_BRACE_P (block
))
14363 block
= BLOCK_SUBBLOCKS (block
);
14364 gcc_assert (BLOCK_OUTER_CURLY_BRACE_P (block
));
14368 /* If FNDECL is a class's key method, add the class to the list of
14369 keyed classes that should be emitted. */
14372 record_key_method_defined (tree fndecl
)
14374 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fndecl
)
14375 && DECL_VIRTUAL_P (fndecl
)
14376 && !processing_template_decl
)
14378 tree fnclass
= DECL_CONTEXT (fndecl
);
14379 if (fndecl
== CLASSTYPE_KEY_METHOD (fnclass
))
14380 keyed_classes
= tree_cons (NULL_TREE
, fnclass
, keyed_classes
);
14384 /* Subroutine of finish_function.
14385 Save the body of constexpr functions for possible
14386 future compile time evaluation. */
14389 maybe_save_function_definition (tree fun
)
14391 if (!processing_template_decl
14392 && DECL_DECLARED_CONSTEXPR_P (fun
)
14393 && !cp_function_chain
->invalid_constexpr
14394 && !DECL_CLONED_FUNCTION_P (fun
))
14395 register_constexpr_fundef (fun
, DECL_SAVED_TREE (fun
));
14398 /* Finish up a function declaration and compile that function
14399 all the way to assembler language output. The free the storage
14400 for the function definition.
14402 FLAGS is a bitwise or of the following values:
14404 We just finished processing the body of an in-class inline
14405 function definition. (This processing will have taken place
14406 after the class definition is complete.) */
14409 finish_function (int flags
)
14411 tree fndecl
= current_function_decl
;
14412 tree fntype
, ctype
= NULL_TREE
;
14413 int inclass_inline
= (flags
& 2) != 0;
14415 /* When we get some parse errors, we can end up without a
14416 current_function_decl, so cope. */
14417 if (fndecl
== NULL_TREE
)
14418 return error_mark_node
;
14420 if (c_dialect_objc ())
14421 objc_finish_function ();
14423 gcc_assert (!defer_mark_used_calls
);
14424 defer_mark_used_calls
= true;
14426 record_key_method_defined (fndecl
);
14428 fntype
= TREE_TYPE (fndecl
);
14430 /* TREE_READONLY (fndecl) = 1;
14431 This caused &foo to be of type ptr-to-const-function
14432 which then got a warning when stored in a ptr-to-function variable. */
14434 gcc_assert (building_stmt_list_p ());
14435 /* The current function is being defined, so its DECL_INITIAL should
14436 be set, and unless there's a multiple definition, it should be
14437 error_mark_node. */
14438 gcc_assert (DECL_INITIAL (fndecl
) == error_mark_node
);
14440 /* For a cloned function, we've already got all the code we need;
14441 there's no need to add any extra bits. */
14442 if (!DECL_CLONED_FUNCTION_P (fndecl
))
14444 /* Make it so that `main' always returns 0 by default. */
14445 if (DECL_MAIN_P (current_function_decl
))
14446 finish_return_stmt (integer_zero_node
);
14448 if (use_eh_spec_block (current_function_decl
))
14449 finish_eh_spec_block (TYPE_RAISES_EXCEPTIONS
14450 (TREE_TYPE (current_function_decl
)),
14451 current_eh_spec_block
);
14454 /* If we're saving up tree structure, tie off the function now. */
14455 DECL_SAVED_TREE (fndecl
) = pop_stmt_list (DECL_SAVED_TREE (fndecl
));
14457 if (fn_contains_cilk_spawn_p (cfun
) && !processing_template_decl
)
14458 cfun
->cilk_frame_decl
= insert_cilk_frame (fndecl
);
14460 finish_fname_decls ();
14462 /* If this function can't throw any exceptions, remember that. */
14463 if (!processing_template_decl
14464 && !cp_function_chain
->can_throw
14465 && !flag_non_call_exceptions
14466 && !decl_replaceable_p (fndecl
))
14467 TREE_NOTHROW (fndecl
) = 1;
14469 /* This must come after expand_function_end because cleanups might
14470 have declarations (from inline functions) that need to go into
14471 this function's blocks. */
14473 /* If the current binding level isn't the outermost binding level
14474 for this function, either there is a bug, or we have experienced
14475 syntax errors and the statement tree is malformed. */
14476 if (current_binding_level
->kind
!= sk_function_parms
)
14478 /* Make sure we have already experienced errors. */
14479 gcc_assert (errorcount
);
14481 /* Throw away the broken statement tree and extra binding
14483 DECL_SAVED_TREE (fndecl
) = alloc_stmt_list ();
14485 while (current_binding_level
->kind
!= sk_function_parms
)
14487 if (current_binding_level
->kind
== sk_class
)
14488 pop_nested_class ();
14490 poplevel (0, 0, 0);
14493 poplevel (1, 0, 1);
14495 /* Statements should always be full-expressions at the outermost set
14496 of curly braces for a function. */
14497 gcc_assert (stmts_are_full_exprs_p ());
14499 /* If there are no return statements in a function with auto return type,
14500 the return type is void. But if the declared type is something like
14501 auto*, this is an error. */
14502 if (!processing_template_decl
&& FNDECL_USED_AUTO (fndecl
)
14503 && TREE_TYPE (fntype
) == current_function_auto_return_pattern
)
14505 if (!is_auto (current_function_auto_return_pattern
)
14506 && !current_function_returns_value
&& !current_function_returns_null
)
14508 error ("no return statements in function returning %qT",
14509 current_function_auto_return_pattern
);
14510 inform (input_location
, "only plain %<auto%> return type can be "
14511 "deduced to %<void%>");
14513 apply_deduced_return_type (fndecl
, void_type_node
);
14514 fntype
= TREE_TYPE (fndecl
);
14517 // If this is a concept, check that the definition is reasonable.
14518 if (DECL_DECLARED_CONCEPT_P (fndecl
))
14519 check_function_concept (fndecl
);
14521 /* Save constexpr function body before it gets munged by
14522 the NRV transformation. */
14523 maybe_save_function_definition (fndecl
);
14525 /* Set up the named return value optimization, if we can. Candidate
14526 variables are selected in check_return_expr. */
14527 if (current_function_return_value
)
14529 tree r
= current_function_return_value
;
14532 if (r
!= error_mark_node
14533 /* This is only worth doing for fns that return in memory--and
14534 simpler, since we don't have to worry about promoted modes. */
14535 && aggregate_value_p (TREE_TYPE (TREE_TYPE (fndecl
)), fndecl
)
14536 /* Only allow this for variables declared in the outer scope of
14537 the function so we know that their lifetime always ends with a
14538 return; see g++.dg/opt/nrv6.C. We could be more flexible if
14539 we were to do this optimization in tree-ssa. */
14540 && (outer
= outer_curly_brace_block (fndecl
))
14541 && chain_member (r
, BLOCK_VARS (outer
)))
14542 finalize_nrv (&DECL_SAVED_TREE (fndecl
), r
, DECL_RESULT (fndecl
));
14544 current_function_return_value
= NULL_TREE
;
14547 /* Remember that we were in class scope. */
14548 if (current_class_name
)
14549 ctype
= current_class_type
;
14551 /* Must mark the RESULT_DECL as being in this function. */
14552 DECL_CONTEXT (DECL_RESULT (fndecl
)) = fndecl
;
14554 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
14555 to the FUNCTION_DECL node itself. */
14556 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl
)) = fndecl
;
14558 /* Save away current state, if appropriate. */
14559 if (!processing_template_decl
)
14560 save_function_data (fndecl
);
14562 /* Complain if there's just no return statement. */
14563 if (warn_return_type
14564 && !VOID_TYPE_P (TREE_TYPE (fntype
))
14565 && !dependent_type_p (TREE_TYPE (fntype
))
14566 && !current_function_returns_value
&& !current_function_returns_null
14567 /* Don't complain if we abort or throw. */
14568 && !current_function_returns_abnormally
14569 /* Don't complain if there's an infinite loop. */
14570 && !current_function_infinite_loop
14571 /* Don't complain if we are declared noreturn. */
14572 && !TREE_THIS_VOLATILE (fndecl
)
14573 && !DECL_NAME (DECL_RESULT (fndecl
))
14574 && !TREE_NO_WARNING (fndecl
)
14575 /* Structor return values (if any) are set by the compiler. */
14576 && !DECL_CONSTRUCTOR_P (fndecl
)
14577 && !DECL_DESTRUCTOR_P (fndecl
)
14578 && targetm
.warn_func_return (fndecl
))
14580 warning (OPT_Wreturn_type
,
14581 "no return statement in function returning non-void");
14582 TREE_NO_WARNING (fndecl
) = 1;
14585 /* Store the end of the function, so that we get good line number
14586 info for the epilogue. */
14587 cfun
->function_end_locus
= input_location
;
14589 /* Complain about parameters that are only set, but never otherwise used. */
14590 if (warn_unused_but_set_parameter
14591 && !processing_template_decl
14592 && errorcount
== unused_but_set_errorcount
14593 && !DECL_CLONED_FUNCTION_P (fndecl
))
14597 for (decl
= DECL_ARGUMENTS (fndecl
);
14599 decl
= DECL_CHAIN (decl
))
14600 if (TREE_USED (decl
)
14601 && TREE_CODE (decl
) == PARM_DECL
14602 && !DECL_READ_P (decl
)
14603 && DECL_NAME (decl
)
14604 && !DECL_ARTIFICIAL (decl
)
14605 && !TREE_NO_WARNING (decl
)
14606 && !DECL_IN_SYSTEM_HEADER (decl
)
14607 && TREE_TYPE (decl
) != error_mark_node
14608 && TREE_CODE (TREE_TYPE (decl
)) != REFERENCE_TYPE
14609 && (!CLASS_TYPE_P (TREE_TYPE (decl
))
14610 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl
))))
14611 warning_at (DECL_SOURCE_LOCATION (decl
),
14612 OPT_Wunused_but_set_parameter
,
14613 "parameter %qD set but not used", decl
);
14614 unused_but_set_errorcount
= errorcount
;
14617 /* Complain about locally defined typedefs that are not used in this
14619 maybe_warn_unused_local_typedefs ();
14621 /* Possibly warn about unused parameters. */
14622 if (warn_unused_parameter
14623 && !processing_template_decl
14624 && !DECL_CLONED_FUNCTION_P (fndecl
))
14625 do_warn_unused_parameter (fndecl
);
14627 /* Genericize before inlining. */
14628 if (!processing_template_decl
)
14630 struct language_function
*f
= DECL_SAVED_FUNCTION_DATA (fndecl
);
14631 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE
, fndecl
);
14632 cp_genericize (fndecl
);
14633 /* Clear out the bits we don't need. */
14634 f
->x_current_class_ptr
= NULL
;
14635 f
->x_current_class_ref
= NULL
;
14636 f
->x_eh_spec_block
= NULL
;
14637 f
->x_in_charge_parm
= NULL
;
14638 f
->x_vtt_parm
= NULL
;
14639 f
->x_return_value
= NULL
;
14640 f
->bindings
= NULL
;
14641 f
->extern_decl_map
= NULL
;
14642 f
->infinite_loops
= NULL
;
14644 /* Clear out the bits we don't need. */
14645 local_names
= NULL
;
14647 /* We're leaving the context of this function, so zap cfun. It's still in
14648 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
14650 current_function_decl
= NULL
;
14652 /* If this is an in-class inline definition, we may have to pop the
14653 bindings for the template parameters that we added in
14654 maybe_begin_member_template_processing when start_function was
14656 if (inclass_inline
)
14657 maybe_end_member_template_processing ();
14659 /* Leave the scope of the class. */
14661 pop_nested_class ();
14666 current_function_decl
= NULL_TREE
;
14668 defer_mark_used_calls
= false;
14669 if (deferred_mark_used_calls
)
14674 FOR_EACH_VEC_SAFE_ELT (deferred_mark_used_calls
, i
, decl
)
14676 vec_free (deferred_mark_used_calls
);
14679 invoke_plugin_callbacks (PLUGIN_FINISH_PARSE_FUNCTION
, fndecl
);
14683 /* Create the FUNCTION_DECL for a function definition.
14684 DECLSPECS and DECLARATOR are the parts of the declaration;
14685 they describe the return type and the name of the function,
14686 but twisted together in a fashion that parallels the syntax of C.
14688 This function creates a binding context for the function body
14689 as well as setting up the FUNCTION_DECL in current_function_decl.
14691 Returns a FUNCTION_DECL on success.
14693 If the DECLARATOR is not suitable for a function (it defines a datum
14694 instead), we return 0, which tells yyparse to report a parse error.
14696 May return void_type_node indicating that this method is actually
14697 a friend. See grokfield for more details.
14699 Came here with a `.pushlevel' .
14701 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
14702 CHANGES TO CODE IN `grokfield'. */
14705 grokmethod (cp_decl_specifier_seq
*declspecs
,
14706 const cp_declarator
*declarator
, tree attrlist
)
14708 tree fndecl
= grokdeclarator (declarator
, declspecs
, MEMFUNCDEF
, 0,
14711 if (fndecl
== error_mark_node
)
14712 return error_mark_node
;
14714 if (fndecl
== NULL
|| TREE_CODE (fndecl
) != FUNCTION_DECL
)
14716 error ("invalid member function declaration");
14717 return error_mark_node
;
14721 cplus_decl_attributes (&fndecl
, attrlist
, 0);
14723 /* Pass friends other than inline friend functions back. */
14724 if (fndecl
== void_type_node
)
14727 if (DECL_IN_AGGR_P (fndecl
))
14729 if (DECL_CLASS_SCOPE_P (fndecl
))
14730 error ("%qD is already defined in class %qT", fndecl
,
14731 DECL_CONTEXT (fndecl
));
14732 return error_mark_node
;
14735 check_template_shadow (fndecl
);
14737 if (TREE_PUBLIC (fndecl
))
14738 DECL_COMDAT (fndecl
) = 1;
14739 DECL_DECLARED_INLINE_P (fndecl
) = 1;
14740 DECL_NO_INLINE_WARNING_P (fndecl
) = 1;
14742 /* We process method specializations in finish_struct_1. */
14743 if (processing_template_decl
&& !DECL_TEMPLATE_SPECIALIZATION (fndecl
))
14745 fndecl
= push_template_decl (fndecl
);
14746 if (fndecl
== error_mark_node
)
14750 if (! DECL_FRIEND_P (fndecl
))
14752 if (DECL_CHAIN (fndecl
))
14754 fndecl
= copy_node (fndecl
);
14755 TREE_CHAIN (fndecl
) = NULL_TREE
;
14759 cp_finish_decl (fndecl
, NULL_TREE
, false, NULL_TREE
, 0);
14761 DECL_IN_AGGR_P (fndecl
) = 1;
14766 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
14767 we can lay it out later, when and if its type becomes complete.
14769 Also handle constexpr variables where the initializer involves
14770 an unlowered PTRMEM_CST because the class isn't complete yet. */
14773 maybe_register_incomplete_var (tree var
)
14775 gcc_assert (VAR_P (var
));
14777 /* Keep track of variables with incomplete types. */
14778 if (!processing_template_decl
&& TREE_TYPE (var
) != error_mark_node
14779 && DECL_EXTERNAL (var
))
14781 tree inner_type
= TREE_TYPE (var
);
14783 while (TREE_CODE (inner_type
) == ARRAY_TYPE
)
14784 inner_type
= TREE_TYPE (inner_type
);
14785 inner_type
= TYPE_MAIN_VARIANT (inner_type
);
14787 if ((!COMPLETE_TYPE_P (inner_type
) && CLASS_TYPE_P (inner_type
))
14788 /* RTTI TD entries are created while defining the type_info. */
14789 || (TYPE_LANG_SPECIFIC (inner_type
)
14790 && TYPE_BEING_DEFINED (inner_type
)))
14792 incomplete_var iv
= {var
, inner_type
};
14793 vec_safe_push (incomplete_vars
, iv
);
14795 else if (!(DECL_LANG_SPECIFIC (var
) && DECL_TEMPLATE_INFO (var
))
14796 && decl_constant_var_p (var
)
14797 && (TYPE_PTRMEM_P (inner_type
) || CLASS_TYPE_P (inner_type
)))
14799 /* When the outermost open class is complete we can resolve any
14800 pointers-to-members. */
14801 tree context
= outermost_open_class ();
14802 incomplete_var iv
= {var
, context
};
14803 vec_safe_push (incomplete_vars
, iv
);
14808 /* Called when a class type (given by TYPE) is defined. If there are
14809 any existing VAR_DECLs whose type has been completed by this
14810 declaration, update them now. */
14813 complete_vars (tree type
)
14816 incomplete_var
*iv
;
14818 for (ix
= 0; vec_safe_iterate (incomplete_vars
, ix
, &iv
); )
14820 if (same_type_p (type
, iv
->incomplete_type
))
14822 tree var
= iv
->decl
;
14823 tree type
= TREE_TYPE (var
);
14825 if (TYPE_MAIN_VARIANT (strip_array_types (type
))
14826 == iv
->incomplete_type
)
14828 /* Complete the type of the variable. The VAR_DECL itself
14829 will be laid out in expand_expr. */
14830 complete_type (type
);
14831 cp_apply_type_quals_to_decl (cp_type_quals (type
), var
);
14834 if (DECL_INITIAL (var
)
14835 && decl_constant_var_p (var
))
14836 DECL_INITIAL (var
) = cplus_expand_constant (DECL_INITIAL (var
));
14838 /* Remove this entry from the list. */
14839 incomplete_vars
->unordered_remove (ix
);
14845 /* Check for pending declarations which may have abstract type. */
14846 complete_type_check_abstract (type
);
14849 /* If DECL is of a type which needs a cleanup, build and return an
14850 expression to perform that cleanup here. Return NULL_TREE if no
14851 cleanup need be done. */
14854 cxx_maybe_build_cleanup (tree decl
, tsubst_flags_t complain
)
14860 /* Assume no cleanup is required. */
14861 cleanup
= NULL_TREE
;
14863 if (error_operand_p (decl
))
14866 /* Handle "__attribute__((cleanup))". We run the cleanup function
14867 before the destructor since the destructor is what actually
14868 terminates the lifetime of the object. */
14869 attr
= lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl
));
14876 /* Get the name specified by the user for the cleanup function. */
14877 id
= TREE_VALUE (TREE_VALUE (attr
));
14878 /* Look up the name to find the cleanup function to call. It is
14879 important to use lookup_name here because that is what is
14880 used in c-common.c:handle_cleanup_attribute when performing
14881 initial checks on the attribute. Note that those checks
14882 include ensuring that the function found is not an overloaded
14883 function, or an object with an overloaded call operator,
14884 etc.; we can rely on the fact that the function found is an
14885 ordinary FUNCTION_DECL. */
14886 fn
= lookup_name (id
);
14887 arg
= build_address (decl
);
14888 if (!mark_used (decl
, complain
) && !(complain
& tf_error
))
14889 return error_mark_node
;
14890 cleanup
= cp_build_function_call_nary (fn
, complain
, arg
, NULL_TREE
);
14891 if (cleanup
== error_mark_node
)
14892 return error_mark_node
;
14894 /* Handle ordinary C++ destructors. */
14895 type
= TREE_TYPE (decl
);
14896 if (type_build_dtor_call (type
))
14898 int flags
= LOOKUP_NORMAL
|LOOKUP_NONVIRTUAL
|LOOKUP_DESTRUCTOR
;
14902 if (TREE_CODE (type
) == ARRAY_TYPE
)
14905 addr
= build_address (decl
);
14907 call
= build_delete (TREE_TYPE (addr
), addr
,
14908 sfk_complete_destructor
, flags
, 0, complain
);
14909 if (call
== error_mark_node
)
14910 cleanup
= error_mark_node
;
14911 else if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type
))
14912 /* Discard the call. */;
14914 cleanup
= cp_build_compound_expr (cleanup
, call
, complain
);
14919 /* build_delete sets the location of the destructor call to the
14920 current location, even though the destructor is going to be
14921 called later, at the end of the current scope. This can lead to
14922 a "jumpy" behaviour for users of debuggers when they step around
14923 the end of the block. So let's unset the location of the
14924 destructor call instead. */
14925 if (cleanup
!= NULL
&& EXPR_P (cleanup
))
14926 SET_EXPR_LOCATION (cleanup
, UNKNOWN_LOCATION
);
14929 && !lookup_attribute ("warn_unused", TYPE_ATTRIBUTES (TREE_TYPE (decl
)))
14930 /* Treat objects with destructors as used; the destructor may do
14931 something substantive. */
14932 && !mark_used (decl
, complain
) && !(complain
& tf_error
))
14933 return error_mark_node
;
14939 /* Return the FUNCTION_TYPE that corresponds to MEMFNTYPE, which can be a
14940 FUNCTION_DECL, METHOD_TYPE, FUNCTION_TYPE, pointer or reference to
14941 METHOD_TYPE or FUNCTION_TYPE, or pointer to member function. */
14944 static_fn_type (tree memfntype
)
14949 if (TYPE_PTRMEMFUNC_P (memfntype
))
14950 memfntype
= TYPE_PTRMEMFUNC_FN_TYPE (memfntype
);
14951 if (POINTER_TYPE_P (memfntype
)
14952 || TREE_CODE (memfntype
) == FUNCTION_DECL
)
14953 memfntype
= TREE_TYPE (memfntype
);
14954 if (TREE_CODE (memfntype
) == FUNCTION_TYPE
)
14956 gcc_assert (TREE_CODE (memfntype
) == METHOD_TYPE
);
14957 args
= TYPE_ARG_TYPES (memfntype
);
14958 cp_ref_qualifier rqual
= type_memfn_rqual (memfntype
);
14959 fntype
= build_function_type (TREE_TYPE (memfntype
), TREE_CHAIN (args
));
14960 fntype
= apply_memfn_quals (fntype
, type_memfn_quals (memfntype
), rqual
);
14961 fntype
= (cp_build_type_attribute_variant
14962 (fntype
, TYPE_ATTRIBUTES (memfntype
)));
14963 fntype
= (build_exception_variant
14964 (fntype
, TYPE_RAISES_EXCEPTIONS (memfntype
)));
14965 if (TYPE_HAS_LATE_RETURN_TYPE (memfntype
))
14966 TYPE_HAS_LATE_RETURN_TYPE (fntype
) = 1;
14970 /* DECL was originally constructed as a non-static member function,
14971 but turned out to be static. Update it accordingly. */
14974 revert_static_member_fn (tree decl
)
14976 tree stype
= static_fn_type (decl
);
14977 cp_cv_quals quals
= type_memfn_quals (stype
);
14978 cp_ref_qualifier rqual
= type_memfn_rqual (stype
);
14980 if (quals
!= TYPE_UNQUALIFIED
|| rqual
!= REF_QUAL_NONE
)
14981 stype
= apply_memfn_quals (stype
, TYPE_UNQUALIFIED
, REF_QUAL_NONE
);
14983 TREE_TYPE (decl
) = stype
;
14985 if (DECL_ARGUMENTS (decl
))
14986 DECL_ARGUMENTS (decl
) = DECL_CHAIN (DECL_ARGUMENTS (decl
));
14987 DECL_STATIC_FUNCTION_P (decl
) = 1;
14990 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
14991 one of the language-independent trees. */
14993 enum cp_tree_node_structure_enum
14994 cp_tree_node_structure (union lang_tree_node
* t
)
14996 switch (TREE_CODE (&t
->generic
))
14998 case DEFAULT_ARG
: return TS_CP_DEFAULT_ARG
;
14999 case DEFERRED_NOEXCEPT
: return TS_CP_DEFERRED_NOEXCEPT
;
15000 case IDENTIFIER_NODE
: return TS_CP_IDENTIFIER
;
15001 case OVERLOAD
: return TS_CP_OVERLOAD
;
15002 case TEMPLATE_PARM_INDEX
: return TS_CP_TPI
;
15003 case PTRMEM_CST
: return TS_CP_PTRMEM
;
15004 case BASELINK
: return TS_CP_BASELINK
;
15005 case TEMPLATE_DECL
: return TS_CP_TEMPLATE_DECL
;
15006 case STATIC_ASSERT
: return TS_CP_STATIC_ASSERT
;
15007 case ARGUMENT_PACK_SELECT
: return TS_CP_ARGUMENT_PACK_SELECT
;
15008 case TRAIT_EXPR
: return TS_CP_TRAIT_EXPR
;
15009 case LAMBDA_EXPR
: return TS_CP_LAMBDA_EXPR
;
15010 case TEMPLATE_INFO
: return TS_CP_TEMPLATE_INFO
;
15011 case CONSTRAINT_INFO
: return TS_CP_CONSTRAINT_INFO
;
15012 case USERDEF_LITERAL
: return TS_CP_USERDEF_LITERAL
;
15013 default: return TS_CP_GENERIC
;
15017 /* Build the void_list_node (void_type_node having been created). */
15019 build_void_list_node (void)
15021 tree t
= build_tree_list (NULL_TREE
, void_type_node
);
15026 cp_missing_noreturn_ok_p (tree decl
)
15028 /* A missing noreturn is ok for the `main' function. */
15029 return DECL_MAIN_P (decl
);
15032 /* Return the decl used to identify the COMDAT group into which DECL should
15036 cxx_comdat_group (tree decl
)
15038 /* Virtual tables, construction virtual tables, and virtual table
15039 tables all go in a single COMDAT group, named after the primary
15041 if (VAR_P (decl
) && DECL_VTABLE_OR_VTT_P (decl
))
15042 decl
= CLASSTYPE_VTABLES (DECL_CONTEXT (decl
));
15043 /* For all other DECLs, the COMDAT group is the mangled name of the
15044 declaration itself. */
15047 while (DECL_THUNK_P (decl
))
15049 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
15050 into the same section as the target function. In that case
15051 we must return target's name. */
15052 tree target
= THUNK_TARGET (decl
);
15053 if (TARGET_USE_LOCAL_THUNK_ALIAS_P (target
)
15054 && DECL_SECTION_NAME (target
) != NULL
15055 && DECL_ONE_ONLY (target
))
15065 /* Returns the return type for FN as written by the user, which may include
15066 a placeholder for a deduced return type. */
15069 fndecl_declared_return_type (tree fn
)
15071 fn
= STRIP_TEMPLATE (fn
);
15072 if (FNDECL_USED_AUTO (fn
))
15074 struct language_function
*f
= NULL
;
15075 if (DECL_STRUCT_FUNCTION (fn
))
15076 f
= DECL_STRUCT_FUNCTION (fn
)->language
;
15078 f
= DECL_SAVED_FUNCTION_DATA (fn
);
15079 return f
->x_auto_return_pattern
;
15081 return TREE_TYPE (TREE_TYPE (fn
));
15084 /* Returns true iff DECL was declared with an auto return type and it has
15085 not yet been deduced to a real type. */
15088 undeduced_auto_decl (tree decl
)
15090 if (cxx_dialect
< cxx14
)
15092 return type_uses_auto (TREE_TYPE (decl
));
15095 /* Complain if DECL has an undeduced return type. */
15098 require_deduced_type (tree decl
)
15100 if (undeduced_auto_decl (decl
))
15101 error ("use of %qD before deduction of %<auto%>", decl
);
15104 #include "gt-cp-decl.h"