1 /* Process declarations and variables for C compiler.
2 Copyright (C) 1988-2014 Free Software Foundation, Inc.
4 This file is part of GCC.
6 GCC is free software; you can redistribute it and/or modify it under
7 the terms of the GNU General Public License as published by the Free
8 Software Foundation; either version 3, or (at your option) any later
11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 You should have received a copy of the GNU General Public License
17 along with GCC; see the file COPYING3. If not see
18 <http://www.gnu.org/licenses/>. */
20 /* Process declarations and symbol lookup for C front end.
21 Also constructs types; the standard scalar types at initialization,
22 and structure, union, array and enum types when they are declared. */
24 /* ??? not all decl nodes are given the most useful possible
25 line numbers. For example, the CONST_DECLs for enum values. */
29 #include "coretypes.h"
34 #include "print-tree.h"
35 #include "stor-layout.h"
38 #include "stringpool.h"
39 #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-ubsan.h"
55 #include "langhooks.h"
56 #include "tree-iterator.h"
57 #include "diagnostic-core.h"
60 #include "hash-table.h"
61 #include "langhooks-def.h"
62 #include "pointer-set.h"
64 #include "c-family/c-ada-spec.h"
68 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
70 { NORMAL
, /* Ordinary declaration */
71 FUNCDEF
, /* Function definition */
72 PARM
, /* Declaration of parm before function body */
73 FIELD
, /* Declaration inside struct or union */
74 TYPENAME
}; /* Typename (inside cast or sizeof) */
76 /* States indicating how grokdeclarator() should handle declspecs marked
77 with __attribute__((deprecated)). An object declared as
78 __attribute__((deprecated)) suppresses warnings of uses of other
81 enum deprecated_states
{
87 /* Nonzero if we have seen an invalid cross reference
88 to a struct, union, or enum, but not yet printed the message. */
89 tree pending_invalid_xref
;
91 /* File and line to appear in the eventual error message. */
92 location_t pending_invalid_xref_location
;
94 /* The file and line that the prototype came from if this is an
95 old-style definition; used for diagnostics in
96 store_parm_decls_oldstyle. */
98 static location_t current_function_prototype_locus
;
100 /* Whether this prototype was built-in. */
102 static bool current_function_prototype_built_in
;
104 /* The argument type information of this prototype. */
106 static tree current_function_prototype_arg_types
;
108 /* The argument information structure for the function currently being
111 static struct c_arg_info
*current_function_arg_info
;
113 /* The obstack on which parser and related data structures, which are
114 not live beyond their top-level declaration or definition, are
116 struct obstack parser_obstack
;
118 /* The current statement tree. */
120 static GTY(()) struct stmt_tree_s c_stmt_tree
;
122 /* State saving variables. */
126 /* A list of decls to be made automatically visible in each file scope. */
127 static GTY(()) tree visible_builtins
;
129 /* Set to 0 at beginning of a function definition, set to 1 if
130 a return statement that specifies a return value is seen. */
132 int current_function_returns_value
;
134 /* Set to 0 at beginning of a function definition, set to 1 if
135 a return statement with no argument is seen. */
137 int current_function_returns_null
;
139 /* Set to 0 at beginning of a function definition, set to 1 if
140 a call to a noreturn function is seen. */
142 int current_function_returns_abnormally
;
144 /* Set to nonzero by `grokdeclarator' for a function
145 whose return type is defaulted, if warnings for this are desired. */
147 static int warn_about_return_type
;
149 /* Nonzero when the current toplevel function contains a declaration
150 of a nested function which is never defined. */
152 static bool undef_nested_function
;
154 /* Mode used to build pointers (VOIDmode means ptr_mode). */
156 enum machine_mode c_default_pointer_mode
= VOIDmode
;
158 /* If non-zero, implicit "omp declare target" attribute is added into the
160 int current_omp_declare_target_attribute
;
162 /* Each c_binding structure describes one binding of an identifier to
163 a decl. All the decls in a scope - irrespective of namespace - are
164 chained together by the ->prev field, which (as the name implies)
165 runs in reverse order. All the decls in a given namespace bound to
166 a given identifier are chained by the ->shadowed field, which runs
167 from inner to outer scopes.
169 The ->decl field usually points to a DECL node, but there are two
170 exceptions. In the namespace of type tags, the bound entity is a
171 RECORD_TYPE, UNION_TYPE, or ENUMERAL_TYPE node. If an undeclared
172 identifier is encountered, it is bound to error_mark_node to
173 suppress further errors about that identifier in the current
176 The ->u.type field stores the type of the declaration in this scope;
177 if NULL, the type is the type of the ->decl field. This is only of
178 relevance for objects with external or internal linkage which may
179 be redeclared in inner scopes, forming composite types that only
180 persist for the duration of those scopes. In the external scope,
181 this stores the composite of all the types declared for this
182 object, visible or not. The ->inner_comp field (used only at file
183 scope) stores whether an incomplete array type at file scope was
184 completed at an inner scope to an array size other than 1.
186 The ->u.label field is used for labels. It points to a structure
187 which stores additional information used for warnings.
189 The depth field is copied from the scope structure that holds this
190 decl. It is used to preserve the proper ordering of the ->shadowed
191 field (see bind()) and also for a handful of special-case checks.
192 Finally, the invisible bit is true for a decl which should be
193 ignored for purposes of normal name lookup, and the nested bit is
194 true for a decl that's been bound a second time in an inner scope;
195 in all such cases, the binding in the outer scope will have its
196 invisible bit true. */
198 struct GTY((chain_next ("%h.prev"))) c_binding
{
199 union GTY(()) { /* first so GTY desc can use decl */
200 tree
GTY((tag ("0"))) type
; /* the type in this scope */
201 struct c_label_vars
* GTY((tag ("1"))) label
; /* for warnings */
202 } GTY((desc ("TREE_CODE (%0.decl) == LABEL_DECL"))) u
;
203 tree decl
; /* the decl bound */
204 tree id
; /* the identifier it's bound to */
205 struct c_binding
*prev
; /* the previous decl in this scope */
206 struct c_binding
*shadowed
; /* the innermost decl shadowed by this one */
207 unsigned int depth
: 28; /* depth of this scope */
208 BOOL_BITFIELD invisible
: 1; /* normal lookup should ignore this binding */
209 BOOL_BITFIELD nested
: 1; /* do not set DECL_CONTEXT when popping */
210 BOOL_BITFIELD inner_comp
: 1; /* incomplete array completed in inner scope */
211 BOOL_BITFIELD in_struct
: 1; /* currently defined as struct field */
212 location_t locus
; /* location for nested bindings */
214 #define B_IN_SCOPE(b1, b2) ((b1)->depth == (b2)->depth)
215 #define B_IN_CURRENT_SCOPE(b) ((b)->depth == current_scope->depth)
216 #define B_IN_FILE_SCOPE(b) ((b)->depth == 1 /*file_scope->depth*/)
217 #define B_IN_EXTERNAL_SCOPE(b) ((b)->depth == 0 /*external_scope->depth*/)
219 #define I_SYMBOL_BINDING(node) \
220 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->symbol_binding)
221 #define I_SYMBOL_DECL(node) \
222 (I_SYMBOL_BINDING(node) ? I_SYMBOL_BINDING(node)->decl : 0)
224 #define I_TAG_BINDING(node) \
225 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->tag_binding)
226 #define I_TAG_DECL(node) \
227 (I_TAG_BINDING(node) ? I_TAG_BINDING(node)->decl : 0)
229 #define I_LABEL_BINDING(node) \
230 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->label_binding)
231 #define I_LABEL_DECL(node) \
232 (I_LABEL_BINDING(node) ? I_LABEL_BINDING(node)->decl : 0)
234 /* Each C symbol points to three linked lists of c_binding structures.
235 These describe the values of the identifier in the three different
236 namespaces defined by the language. */
238 struct GTY(()) lang_identifier
{
239 struct c_common_identifier common_id
;
240 struct c_binding
*symbol_binding
; /* vars, funcs, constants, typedefs */
241 struct c_binding
*tag_binding
; /* struct/union/enum tags */
242 struct c_binding
*label_binding
; /* labels */
245 /* Validate c-lang.c's assumptions. */
246 extern char C_SIZEOF_STRUCT_LANG_IDENTIFIER_isnt_accurate
247 [(sizeof(struct lang_identifier
) == C_SIZEOF_STRUCT_LANG_IDENTIFIER
) ? 1 : -1];
249 /* The resulting tree type. */
251 union GTY((desc ("TREE_CODE (&%h.generic) == IDENTIFIER_NODE"),
252 chain_next ("(union lang_tree_node *) c_tree_chain_next (&%h.generic)"))) lang_tree_node
254 union tree_node
GTY ((tag ("0"),
255 desc ("tree_node_structure (&%h)")))
257 struct lang_identifier
GTY ((tag ("1"))) identifier
;
260 /* Track bindings and other things that matter for goto warnings. For
261 efficiency, we do not gather all the decls at the point of
262 definition. Instead, we point into the bindings structure. As
263 scopes are popped, we update these structures and gather the decls
264 that matter at that time. */
266 struct GTY(()) c_spot_bindings
{
267 /* The currently open scope which holds bindings defined when the
268 label was defined or the goto statement was found. */
269 struct c_scope
*scope
;
270 /* The bindings in the scope field which were defined at the point
271 of the label or goto. This lets us look at older or newer
272 bindings in the scope, as appropriate. */
273 struct c_binding
*bindings_in_scope
;
274 /* The number of statement expressions that have started since this
275 label or goto statement was defined. This is zero if we are at
276 the same statement expression level. It is positive if we are in
277 a statement expression started since this spot. It is negative
278 if this spot was in a statement expression and we have left
281 /* Whether we started in a statement expression but are no longer in
282 it. This is set to true if stmt_exprs ever goes negative. */
286 /* This structure is used to keep track of bindings seen when a goto
287 statement is defined. This is only used if we see the goto
288 statement before we see the label. */
290 struct GTY(()) c_goto_bindings
{
291 /* The location of the goto statement. */
293 /* The bindings of the goto statement. */
294 struct c_spot_bindings goto_bindings
;
297 typedef struct c_goto_bindings
*c_goto_bindings_p
;
299 /* The additional information we keep track of for a label binding.
300 These fields are updated as scopes are popped. */
302 struct GTY(()) c_label_vars
{
303 /* The shadowed c_label_vars, when one label shadows another (which
304 can only happen using a __label__ declaration). */
305 struct c_label_vars
*shadowed
;
306 /* The bindings when the label was defined. */
307 struct c_spot_bindings label_bindings
;
308 /* A list of decls that we care about: decls about which we should
309 warn if a goto branches to this label from later in the function.
310 Decls are added to this list as scopes are popped. We only add
311 the decls that matter. */
312 vec
<tree
, va_gc
> *decls_in_scope
;
313 /* A list of goto statements to this label. This is only used for
314 goto statements seen before the label was defined, so that we can
315 issue appropriate warnings for them. */
316 vec
<c_goto_bindings_p
, va_gc
> *gotos
;
319 /* Each c_scope structure describes the complete contents of one
320 scope. Four scopes are distinguished specially: the innermost or
321 current scope, the innermost function scope, the file scope (always
322 the second to outermost) and the outermost or external scope.
324 Most declarations are recorded in the current scope.
326 All normal label declarations are recorded in the innermost
327 function scope, as are bindings of undeclared identifiers to
328 error_mark_node. (GCC permits nested functions as an extension,
329 hence the 'innermost' qualifier.) Explicitly declared labels
330 (using the __label__ extension) appear in the current scope.
332 Being in the file scope (current_scope == file_scope) causes
333 special behavior in several places below. Also, under some
334 conditions the Objective-C front end records declarations in the
335 file scope even though that isn't the current scope.
337 All declarations with external linkage are recorded in the external
338 scope, even if they aren't visible there; this models the fact that
339 such declarations are visible to the entire program, and (with a
340 bit of cleverness, see pushdecl) allows diagnosis of some violations
341 of C99 6.2.2p7 and 6.2.7p2:
343 If, within the same translation unit, the same identifier appears
344 with both internal and external linkage, the behavior is
347 All declarations that refer to the same object or function shall
348 have compatible type; otherwise, the behavior is undefined.
350 Initially only the built-in declarations, which describe compiler
351 intrinsic functions plus a subset of the standard library, are in
354 The order of the blocks list matters, and it is frequently appended
355 to. To avoid having to walk all the way to the end of the list on
356 each insertion, or reverse the list later, we maintain a pointer to
357 the last list entry. (FIXME: It should be feasible to use a reversed
360 The bindings list is strictly in reverse order of declarations;
361 pop_scope relies on this. */
364 struct GTY((chain_next ("%h.outer"))) c_scope
{
365 /* The scope containing this one. */
366 struct c_scope
*outer
;
368 /* The next outermost function scope. */
369 struct c_scope
*outer_function
;
371 /* All bindings in this scope. */
372 struct c_binding
*bindings
;
374 /* For each scope (except the global one), a chain of BLOCK nodes
375 for all the scopes that were entered and exited one level down. */
379 /* The depth of this scope. Used to keep the ->shadowed chain of
380 bindings sorted innermost to outermost. */
381 unsigned int depth
: 28;
383 /* True if we are currently filling this scope with parameter
385 BOOL_BITFIELD parm_flag
: 1;
387 /* True if we saw [*] in this scope. Used to give an error messages
388 if these appears in a function definition. */
389 BOOL_BITFIELD had_vla_unspec
: 1;
391 /* True if we already complained about forward parameter decls
392 in this scope. This prevents double warnings on
393 foo (int a; int b; ...) */
394 BOOL_BITFIELD warned_forward_parm_decls
: 1;
396 /* True if this is the outermost block scope of a function body.
397 This scope contains the parameters, the local variables declared
398 in the outermost block, and all the labels (except those in
399 nested functions, or declared at block scope with __label__). */
400 BOOL_BITFIELD function_body
: 1;
402 /* True means make a BLOCK for this scope no matter what. */
403 BOOL_BITFIELD keep
: 1;
405 /* True means that an unsuffixed float constant is _Decimal64. */
406 BOOL_BITFIELD float_const_decimal64
: 1;
408 /* True if this scope has any label bindings. This is used to speed
409 up searching for labels when popping scopes, particularly since
410 labels are normally only found at function scope. */
411 BOOL_BITFIELD has_label_bindings
: 1;
413 /* True if we should issue a warning if a goto statement crosses any
414 of the bindings. We still need to check the list of bindings to
415 find the specific ones we need to warn about. This is true if
416 decl_jump_unsafe would return true for any of the bindings. This
417 is used to avoid looping over all the bindings unnecessarily. */
418 BOOL_BITFIELD has_jump_unsafe_decl
: 1;
421 /* The scope currently in effect. */
423 static GTY(()) struct c_scope
*current_scope
;
425 /* The innermost function scope. Ordinary (not explicitly declared)
426 labels, bindings to error_mark_node, and the lazily-created
427 bindings of __func__ and its friends get this scope. */
429 static GTY(()) struct c_scope
*current_function_scope
;
431 /* The C file scope. This is reset for each input translation unit. */
433 static GTY(()) struct c_scope
*file_scope
;
435 /* The outermost scope. This is used for all declarations with
436 external linkage, and only these, hence the name. */
438 static GTY(()) struct c_scope
*external_scope
;
440 /* A chain of c_scope structures awaiting reuse. */
442 static GTY((deletable
)) struct c_scope
*scope_freelist
;
444 /* A chain of c_binding structures awaiting reuse. */
446 static GTY((deletable
)) struct c_binding
*binding_freelist
;
448 /* Append VAR to LIST in scope SCOPE. */
449 #define SCOPE_LIST_APPEND(scope, list, decl) do { \
450 struct c_scope *s_ = (scope); \
452 if (s_->list##_last) \
453 BLOCK_CHAIN (s_->list##_last) = d_; \
456 s_->list##_last = d_; \
459 /* Concatenate FROM in scope FSCOPE onto TO in scope TSCOPE. */
460 #define SCOPE_LIST_CONCAT(tscope, to, fscope, from) do { \
461 struct c_scope *t_ = (tscope); \
462 struct c_scope *f_ = (fscope); \
464 BLOCK_CHAIN (t_->to##_last) = f_->from; \
467 t_->to##_last = f_->from##_last; \
470 /* A c_inline_static structure stores details of a static identifier
471 referenced in a definition of a function that may be an inline
472 definition if no subsequent declaration of that function uses
473 "extern" or does not use "inline". */
475 struct GTY((chain_next ("%h.next"))) c_inline_static
{
476 /* The location for a diagnostic. */
479 /* The function that may be an inline definition. */
482 /* The object or function referenced. */
485 /* What sort of reference this is. */
486 enum c_inline_static_type type
;
488 /* The next such structure or NULL. */
489 struct c_inline_static
*next
;
492 /* List of static identifiers used or referenced in functions that may
493 be inline definitions. */
494 static GTY(()) struct c_inline_static
*c_inline_statics
;
496 /* True means unconditionally make a BLOCK for the next scope pushed. */
498 static bool keep_next_level_flag
;
500 /* True means the next call to push_scope will be the outermost scope
501 of a function body, so do not push a new scope, merely cease
502 expecting parameter decls. */
504 static bool next_is_function_body
;
506 /* A vector of pointers to c_binding structures. */
508 typedef struct c_binding
*c_binding_ptr
;
510 /* Information that we keep for a struct or union while it is being
513 struct c_struct_parse_info
515 /* If warn_cxx_compat, a list of types defined within this
517 vec
<tree
> struct_types
;
518 /* If warn_cxx_compat, a list of field names which have bindings,
519 and which are defined in this struct, but which are not defined
520 in any enclosing struct. This is used to clear the in_struct
521 field of the c_bindings structure. */
522 vec
<c_binding_ptr
> fields
;
523 /* If warn_cxx_compat, a list of typedef names used when defining
524 fields in this struct. */
525 vec
<tree
> typedefs_seen
;
528 /* Information for the struct or union currently being parsed, or
529 NULL if not parsing a struct or union. */
530 static struct c_struct_parse_info
*struct_parse_info
;
532 /* Forward declarations. */
533 static tree
lookup_name_in_scope (tree
, struct c_scope
*);
534 static tree
c_make_fname_decl (location_t
, tree
, int);
535 static tree
grokdeclarator (const struct c_declarator
*,
536 struct c_declspecs
*,
537 enum decl_context
, bool, tree
*, tree
*, tree
*,
538 bool *, enum deprecated_states
);
539 static tree
grokparms (struct c_arg_info
*, bool);
540 static void layout_array_type (tree
);
542 /* T is a statement. Add it to the statement-tree. This is the
543 C/ObjC version--C++ has a slightly different version of this
549 enum tree_code code
= TREE_CODE (t
);
551 if (CAN_HAVE_LOCATION_P (t
) && code
!= LABEL_EXPR
)
553 if (!EXPR_HAS_LOCATION (t
))
554 SET_EXPR_LOCATION (t
, input_location
);
557 if (code
== LABEL_EXPR
|| code
== CASE_LABEL_EXPR
)
558 STATEMENT_LIST_HAS_LABEL (cur_stmt_list
) = 1;
560 /* Add T to the statement-tree. Non-side-effect statements need to be
561 recorded during statement expressions. */
562 if (!building_stmt_list_p ())
564 append_to_statement_list_force (t
, &cur_stmt_list
);
569 /* Build a pointer type using the default pointer mode. */
572 c_build_pointer_type (tree to_type
)
574 addr_space_t as
= to_type
== error_mark_node
? ADDR_SPACE_GENERIC
575 : TYPE_ADDR_SPACE (to_type
);
576 enum machine_mode pointer_mode
;
578 if (as
!= ADDR_SPACE_GENERIC
|| c_default_pointer_mode
== VOIDmode
)
579 pointer_mode
= targetm
.addr_space
.pointer_mode (as
);
581 pointer_mode
= c_default_pointer_mode
;
582 return build_pointer_type_for_mode (to_type
, pointer_mode
, false);
586 /* Return true if we will want to say something if a goto statement
590 decl_jump_unsafe (tree decl
)
592 if (error_operand_p (decl
))
595 /* Always warn about crossing variably modified types. */
596 if ((TREE_CODE (decl
) == VAR_DECL
|| TREE_CODE (decl
) == TYPE_DECL
)
597 && variably_modified_type_p (TREE_TYPE (decl
), NULL_TREE
))
600 /* Otherwise, only warn if -Wgoto-misses-init and this is an
601 initialized automatic decl. */
602 if (warn_jump_misses_init
603 && TREE_CODE (decl
) == VAR_DECL
604 && !TREE_STATIC (decl
)
605 && DECL_INITIAL (decl
) != NULL_TREE
)
613 c_print_identifier (FILE *file
, tree node
, int indent
)
615 print_node (file
, "symbol", I_SYMBOL_DECL (node
), indent
+ 4);
616 print_node (file
, "tag", I_TAG_DECL (node
), indent
+ 4);
617 print_node (file
, "label", I_LABEL_DECL (node
), indent
+ 4);
618 if (C_IS_RESERVED_WORD (node
) && C_RID_CODE (node
) != RID_CXX_COMPAT_WARN
)
620 tree rid
= ridpointers
[C_RID_CODE (node
)];
621 indent_to (file
, indent
+ 4);
622 fprintf (file
, "rid " HOST_PTR_PRINTF
" \"%s\"",
623 (void *) rid
, IDENTIFIER_POINTER (rid
));
627 /* Establish a binding between NAME, an IDENTIFIER_NODE, and DECL,
628 which may be any of several kinds of DECL or TYPE or error_mark_node,
629 in the scope SCOPE. */
631 bind (tree name
, tree decl
, struct c_scope
*scope
, bool invisible
,
632 bool nested
, location_t locus
)
634 struct c_binding
*b
, **here
;
636 if (binding_freelist
)
638 b
= binding_freelist
;
639 binding_freelist
= b
->prev
;
642 b
= ggc_alloc
<c_binding
> ();
647 b
->depth
= scope
->depth
;
648 b
->invisible
= invisible
;
656 b
->prev
= scope
->bindings
;
659 if (decl_jump_unsafe (decl
))
660 scope
->has_jump_unsafe_decl
= 1;
665 switch (TREE_CODE (decl
))
667 case LABEL_DECL
: here
= &I_LABEL_BINDING (name
); break;
670 case RECORD_TYPE
: here
= &I_TAG_BINDING (name
); break;
676 case ERROR_MARK
: here
= &I_SYMBOL_BINDING (name
); break;
682 /* Locate the appropriate place in the chain of shadowed decls
683 to insert this binding. Normally, scope == current_scope and
684 this does nothing. */
685 while (*here
&& (*here
)->depth
> scope
->depth
)
686 here
= &(*here
)->shadowed
;
692 /* Clear the binding structure B, stick it on the binding_freelist,
693 and return the former value of b->prev. This is used by pop_scope
694 and get_parm_info to iterate destructively over all the bindings
695 from a given scope. */
696 static struct c_binding
*
697 free_binding_and_advance (struct c_binding
*b
)
699 struct c_binding
*prev
= b
->prev
;
701 memset (b
, 0, sizeof (struct c_binding
));
702 b
->prev
= binding_freelist
;
703 binding_freelist
= b
;
708 /* Bind a label. Like bind, but skip fields which aren't used for
709 labels, and add the LABEL_VARS value. */
711 bind_label (tree name
, tree label
, struct c_scope
*scope
,
712 struct c_label_vars
*label_vars
)
716 bind (name
, label
, scope
, /*invisible=*/false, /*nested=*/false,
719 scope
->has_label_bindings
= true;
722 gcc_assert (b
->decl
== label
);
723 label_vars
->shadowed
= b
->u
.label
;
724 b
->u
.label
= label_vars
;
727 /* Hook called at end of compilation to assume 1 elt
728 for a file-scope tentative array defn that wasn't complete before. */
731 c_finish_incomplete_decl (tree decl
)
733 if (TREE_CODE (decl
) == VAR_DECL
)
735 tree type
= TREE_TYPE (decl
);
736 if (type
!= error_mark_node
737 && TREE_CODE (type
) == ARRAY_TYPE
738 && !DECL_EXTERNAL (decl
)
739 && TYPE_DOMAIN (type
) == 0)
741 warning_at (DECL_SOURCE_LOCATION (decl
),
742 0, "array %q+D assumed to have one element", decl
);
744 complete_array_type (&TREE_TYPE (decl
), NULL_TREE
, true);
746 relayout_decl (decl
);
751 /* Record that inline function FUNC contains a reference (location
752 LOC) to static DECL (file-scope or function-local according to
756 record_inline_static (location_t loc
, tree func
, tree decl
,
757 enum c_inline_static_type type
)
759 c_inline_static
*csi
= ggc_alloc
<c_inline_static
> ();
761 csi
->function
= func
;
762 csi
->static_decl
= decl
;
764 csi
->next
= c_inline_statics
;
765 c_inline_statics
= csi
;
768 /* Check for references to static declarations in inline functions at
769 the end of the translation unit and diagnose them if the functions
770 are still inline definitions. */
773 check_inline_statics (void)
775 struct c_inline_static
*csi
;
776 for (csi
= c_inline_statics
; csi
; csi
= csi
->next
)
778 if (DECL_EXTERNAL (csi
->function
))
782 pedwarn (csi
->location
, 0,
783 "%qD is static but used in inline function %qD "
784 "which is not static", csi
->static_decl
, csi
->function
);
787 pedwarn (csi
->location
, 0,
788 "%q+D is static but declared in inline function %qD "
789 "which is not static", csi
->static_decl
, csi
->function
);
795 c_inline_statics
= NULL
;
798 /* Fill in a c_spot_bindings structure. If DEFINING is true, set it
799 for the current state, otherwise set it to uninitialized. */
802 set_spot_bindings (struct c_spot_bindings
*p
, bool defining
)
806 p
->scope
= current_scope
;
807 p
->bindings_in_scope
= current_scope
->bindings
;
812 p
->bindings_in_scope
= NULL
;
815 p
->left_stmt_expr
= false;
818 /* Update spot bindings P as we pop out of SCOPE. Return true if we
819 should push decls for a label. */
822 update_spot_bindings (struct c_scope
*scope
, struct c_spot_bindings
*p
)
824 if (p
->scope
!= scope
)
826 /* This label or goto is defined in some other scope, or it is a
827 label which is not yet defined. There is nothing to
832 /* Adjust the spot bindings to refer to the bindings already defined
833 in the enclosing scope. */
834 p
->scope
= scope
->outer
;
835 p
->bindings_in_scope
= p
->scope
->bindings
;
840 /* The Objective-C front-end often needs to determine the current scope. */
843 objc_get_current_scope (void)
845 return current_scope
;
848 /* The following function is used only by Objective-C. It needs to live here
849 because it accesses the innards of c_scope. */
852 objc_mark_locals_volatile (void *enclosing_blk
)
854 struct c_scope
*scope
;
857 for (scope
= current_scope
;
858 scope
&& scope
!= enclosing_blk
;
859 scope
= scope
->outer
)
861 for (b
= scope
->bindings
; b
; b
= b
->prev
)
862 objc_volatilize_decl (b
->decl
);
864 /* Do not climb up past the current function. */
865 if (scope
->function_body
)
870 /* Return true if we are in the global binding level. */
873 global_bindings_p (void)
875 return current_scope
== file_scope
;
879 keep_next_level (void)
881 keep_next_level_flag
= true;
884 /* Set the flag for the FLOAT_CONST_DECIMAL64 pragma being ON. */
887 set_float_const_decimal64 (void)
889 current_scope
->float_const_decimal64
= true;
892 /* Clear the flag for the FLOAT_CONST_DECIMAL64 pragma. */
895 clear_float_const_decimal64 (void)
897 current_scope
->float_const_decimal64
= false;
900 /* Return nonzero if an unsuffixed float constant is _Decimal64. */
903 float_const_decimal64_p (void)
905 return current_scope
->float_const_decimal64
;
908 /* Identify this scope as currently being filled with parameters. */
911 declare_parm_level (void)
913 current_scope
->parm_flag
= true;
919 if (next_is_function_body
)
921 /* This is the transition from the parameters to the top level
922 of the function body. These are the same scope
923 (C99 6.2.1p4,6) so we do not push another scope structure.
924 next_is_function_body is set only by store_parm_decls, which
925 in turn is called when and only when we are about to
926 encounter the opening curly brace for the function body.
928 The outermost block of a function always gets a BLOCK node,
929 because the debugging output routines expect that each
930 function has at least one BLOCK. */
931 current_scope
->parm_flag
= false;
932 current_scope
->function_body
= true;
933 current_scope
->keep
= true;
934 current_scope
->outer_function
= current_function_scope
;
935 current_function_scope
= current_scope
;
937 keep_next_level_flag
= false;
938 next_is_function_body
= false;
940 /* The FLOAT_CONST_DECIMAL64 pragma applies to nested scopes. */
941 if (current_scope
->outer
)
942 current_scope
->float_const_decimal64
943 = current_scope
->outer
->float_const_decimal64
;
945 current_scope
->float_const_decimal64
= false;
949 struct c_scope
*scope
;
952 scope
= scope_freelist
;
953 scope_freelist
= scope
->outer
;
956 scope
= ggc_cleared_alloc
<c_scope
> ();
958 /* The FLOAT_CONST_DECIMAL64 pragma applies to nested scopes. */
960 scope
->float_const_decimal64
= current_scope
->float_const_decimal64
;
962 scope
->float_const_decimal64
= false;
964 scope
->keep
= keep_next_level_flag
;
965 scope
->outer
= current_scope
;
966 scope
->depth
= current_scope
? (current_scope
->depth
+ 1) : 0;
968 /* Check for scope depth overflow. Unlikely (2^28 == 268,435,456) but
970 if (current_scope
&& scope
->depth
== 0)
973 sorry ("GCC supports only %u nested scopes", scope
->depth
);
976 current_scope
= scope
;
977 keep_next_level_flag
= false;
981 /* This is called when we are leaving SCOPE. For each label defined
982 in SCOPE, add any appropriate decls to its decls_in_scope fields.
983 These are the decls whose initialization will be skipped by a goto
984 later in the function. */
987 update_label_decls (struct c_scope
*scope
)
994 if (s
->has_label_bindings
)
998 for (b
= s
->bindings
; b
!= NULL
; b
= b
->prev
)
1000 struct c_label_vars
*label_vars
;
1001 struct c_binding
*b1
;
1004 struct c_goto_bindings
*g
;
1006 if (TREE_CODE (b
->decl
) != LABEL_DECL
)
1008 label_vars
= b
->u
.label
;
1010 b1
= label_vars
->label_bindings
.bindings_in_scope
;
1011 if (label_vars
->label_bindings
.scope
== NULL
)
1014 hjud
= label_vars
->label_bindings
.scope
->has_jump_unsafe_decl
;
1015 if (update_spot_bindings (scope
, &label_vars
->label_bindings
))
1017 /* This label is defined in this scope. */
1020 for (; b1
!= NULL
; b1
= b1
->prev
)
1022 /* A goto from later in the function to this
1023 label will never see the initialization
1024 of B1, if any. Save it to issue a
1025 warning if needed. */
1026 if (decl_jump_unsafe (b1
->decl
))
1027 vec_safe_push(label_vars
->decls_in_scope
, b1
->decl
);
1032 /* Update the bindings of any goto statements associated
1034 FOR_EACH_VEC_SAFE_ELT (label_vars
->gotos
, ix
, g
)
1035 update_spot_bindings (scope
, &g
->goto_bindings
);
1039 /* Don't search beyond the current function. */
1040 if (s
== current_function_scope
)
1047 /* Set the TYPE_CONTEXT of all of TYPE's variants to CONTEXT. */
1050 set_type_context (tree type
, tree context
)
1052 for (type
= TYPE_MAIN_VARIANT (type
); type
;
1053 type
= TYPE_NEXT_VARIANT (type
))
1054 TYPE_CONTEXT (type
) = context
;
1057 /* Exit a scope. Restore the state of the identifier-decl mappings
1058 that were in effect when this scope was entered. Return a BLOCK
1059 node containing all the DECLs in this scope that are of interest
1060 to debug info generation. */
1065 struct c_scope
*scope
= current_scope
;
1066 tree block
, context
, p
;
1067 struct c_binding
*b
;
1069 bool functionbody
= scope
->function_body
;
1070 bool keep
= functionbody
|| scope
->keep
|| scope
->bindings
;
1072 update_label_decls (scope
);
1074 /* If appropriate, create a BLOCK to record the decls for the life
1075 of this function. */
1079 block
= make_node (BLOCK
);
1080 BLOCK_SUBBLOCKS (block
) = scope
->blocks
;
1081 TREE_USED (block
) = 1;
1083 /* In each subblock, record that this is its superior. */
1084 for (p
= scope
->blocks
; p
; p
= BLOCK_CHAIN (p
))
1085 BLOCK_SUPERCONTEXT (p
) = block
;
1087 BLOCK_VARS (block
) = 0;
1090 /* The TYPE_CONTEXTs for all of the tagged types belonging to this
1091 scope must be set so that they point to the appropriate
1092 construct, i.e. either to the current FUNCTION_DECL node, or
1093 else to the BLOCK node we just constructed.
1095 Note that for tagged types whose scope is just the formal
1096 parameter list for some function type specification, we can't
1097 properly set their TYPE_CONTEXTs here, because we don't have a
1098 pointer to the appropriate FUNCTION_TYPE node readily available
1099 to us. For those cases, the TYPE_CONTEXTs of the relevant tagged
1100 type nodes get set in `grokdeclarator' as soon as we have created
1101 the FUNCTION_TYPE node which will represent the "scope" for these
1102 "parameter list local" tagged types. */
1103 if (scope
->function_body
)
1104 context
= current_function_decl
;
1105 else if (scope
== file_scope
)
1107 tree file_decl
= build_translation_unit_decl (NULL_TREE
);
1108 context
= file_decl
;
1113 /* Clear all bindings in this scope. */
1114 for (b
= scope
->bindings
; b
; b
= free_binding_and_advance (b
))
1117 switch (TREE_CODE (p
))
1120 /* Warnings for unused labels, errors for undefined labels. */
1121 if (TREE_USED (p
) && !DECL_INITIAL (p
))
1123 error ("label %q+D used but not defined", p
);
1124 DECL_INITIAL (p
) = error_mark_node
;
1127 warn_for_unused_label (p
);
1129 /* Labels go in BLOCK_VARS. */
1130 DECL_CHAIN (p
) = BLOCK_VARS (block
);
1131 BLOCK_VARS (block
) = p
;
1132 gcc_assert (I_LABEL_BINDING (b
->id
) == b
);
1133 I_LABEL_BINDING (b
->id
) = b
->shadowed
;
1135 /* Also pop back to the shadowed label_vars. */
1136 release_tree_vector (b
->u
.label
->decls_in_scope
);
1137 b
->u
.label
= b
->u
.label
->shadowed
;
1143 set_type_context (p
, context
);
1145 /* Types may not have tag-names, in which case the type
1146 appears in the bindings list with b->id NULL. */
1149 gcc_assert (I_TAG_BINDING (b
->id
) == b
);
1150 I_TAG_BINDING (b
->id
) = b
->shadowed
;
1155 /* Propagate TREE_ADDRESSABLE from nested functions to their
1156 containing functions. */
1157 if (!TREE_ASM_WRITTEN (p
)
1158 && DECL_INITIAL (p
) != 0
1159 && TREE_ADDRESSABLE (p
)
1160 && DECL_ABSTRACT_ORIGIN (p
) != 0
1161 && DECL_ABSTRACT_ORIGIN (p
) != p
)
1162 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (p
)) = 1;
1163 if (!DECL_EXTERNAL (p
)
1164 && !DECL_INITIAL (p
)
1165 && scope
!= file_scope
1166 && scope
!= external_scope
)
1168 error ("nested function %q+D declared but never defined", p
);
1169 undef_nested_function
= true;
1171 else if (DECL_DECLARED_INLINE_P (p
)
1173 && !DECL_INITIAL (p
))
1175 /* C99 6.7.4p6: "a function with external linkage... declared
1176 with an inline function specifier ... shall also be defined
1177 in the same translation unit." */
1178 if (!flag_gnu89_inline
)
1179 pedwarn (input_location
, 0,
1180 "inline function %q+D declared but never defined", p
);
1181 DECL_EXTERNAL (p
) = 1;
1187 /* Warnings for unused variables. */
1188 if ((!TREE_USED (p
) || !DECL_READ_P (p
))
1189 && !TREE_NO_WARNING (p
)
1190 && !DECL_IN_SYSTEM_HEADER (p
)
1192 && !DECL_ARTIFICIAL (p
)
1193 && scope
!= file_scope
1194 && scope
!= external_scope
)
1197 warning (OPT_Wunused_variable
, "unused variable %q+D", p
);
1198 else if (DECL_CONTEXT (p
) == current_function_decl
)
1199 warning_at (DECL_SOURCE_LOCATION (p
),
1200 OPT_Wunused_but_set_variable
,
1201 "variable %qD set but not used", p
);
1206 error ("type of array %q+D completed incompatibly with"
1207 " implicit initialization", p
);
1214 /* All of these go in BLOCK_VARS, but only if this is the
1215 binding in the home scope. */
1218 DECL_CHAIN (p
) = BLOCK_VARS (block
);
1219 BLOCK_VARS (block
) = p
;
1221 else if (VAR_OR_FUNCTION_DECL_P (p
) && scope
!= file_scope
)
1223 /* For block local externs add a special
1224 DECL_EXTERNAL decl for debug info generation. */
1225 tree extp
= copy_node (p
);
1227 DECL_EXTERNAL (extp
) = 1;
1228 TREE_STATIC (extp
) = 0;
1229 TREE_PUBLIC (extp
) = 1;
1230 DECL_INITIAL (extp
) = NULL_TREE
;
1231 DECL_LANG_SPECIFIC (extp
) = NULL
;
1232 DECL_CONTEXT (extp
) = current_function_decl
;
1233 if (TREE_CODE (p
) == FUNCTION_DECL
)
1235 DECL_RESULT (extp
) = NULL_TREE
;
1236 DECL_SAVED_TREE (extp
) = NULL_TREE
;
1237 DECL_STRUCT_FUNCTION (extp
) = NULL
;
1239 if (b
->locus
!= UNKNOWN_LOCATION
)
1240 DECL_SOURCE_LOCATION (extp
) = b
->locus
;
1241 DECL_CHAIN (extp
) = BLOCK_VARS (block
);
1242 BLOCK_VARS (block
) = extp
;
1244 /* If this is the file scope set DECL_CONTEXT of each decl to
1245 the TRANSLATION_UNIT_DECL. This makes same_translation_unit_p
1247 if (scope
== file_scope
)
1249 DECL_CONTEXT (p
) = context
;
1250 if (TREE_CODE (p
) == TYPE_DECL
1251 && TREE_TYPE (p
) != error_mark_node
)
1252 set_type_context (TREE_TYPE (p
), context
);
1256 /* Parameters go in DECL_ARGUMENTS, not BLOCK_VARS, and have
1257 already been put there by store_parm_decls. Unused-
1258 parameter warnings are handled by function.c.
1259 error_mark_node obviously does not go in BLOCK_VARS and
1260 does not get unused-variable warnings. */
1263 /* It is possible for a decl not to have a name. We get
1264 here with b->id NULL in this case. */
1267 gcc_assert (I_SYMBOL_BINDING (b
->id
) == b
);
1268 I_SYMBOL_BINDING (b
->id
) = b
->shadowed
;
1269 if (b
->shadowed
&& b
->shadowed
->u
.type
)
1270 TREE_TYPE (b
->shadowed
->decl
) = b
->shadowed
->u
.type
;
1280 /* Dispose of the block that we just made inside some higher level. */
1281 if ((scope
->function_body
|| scope
== file_scope
) && context
)
1283 DECL_INITIAL (context
) = block
;
1284 BLOCK_SUPERCONTEXT (block
) = context
;
1286 else if (scope
->outer
)
1289 SCOPE_LIST_APPEND (scope
->outer
, blocks
, block
);
1290 /* If we did not make a block for the scope just exited, any
1291 blocks made for inner scopes must be carried forward so they
1292 will later become subblocks of something else. */
1293 else if (scope
->blocks
)
1294 SCOPE_LIST_CONCAT (scope
->outer
, blocks
, scope
, blocks
);
1297 /* Pop the current scope, and free the structure for reuse. */
1298 current_scope
= scope
->outer
;
1299 if (scope
->function_body
)
1300 current_function_scope
= scope
->outer_function
;
1302 memset (scope
, 0, sizeof (struct c_scope
));
1303 scope
->outer
= scope_freelist
;
1304 scope_freelist
= scope
;
1310 push_file_scope (void)
1318 file_scope
= current_scope
;
1320 start_fname_decls ();
1322 for (decl
= visible_builtins
; decl
; decl
= DECL_CHAIN (decl
))
1323 bind (DECL_NAME (decl
), decl
, file_scope
,
1324 /*invisible=*/false, /*nested=*/true, DECL_SOURCE_LOCATION (decl
));
1328 pop_file_scope (void)
1330 /* In case there were missing closebraces, get us back to the global
1332 while (current_scope
!= file_scope
)
1335 /* __FUNCTION__ is defined at file scope (""). This
1336 call may not be necessary as my tests indicate it
1337 still works without it. */
1338 finish_fname_decls ();
1340 check_inline_statics ();
1342 /* This is the point to write out a PCH if we're doing that.
1343 In that case we do not want to do anything else. */
1346 c_common_write_pch ();
1350 /* Pop off the file scope and close this translation unit. */
1354 maybe_apply_pending_pragma_weaks ();
1357 /* Adjust the bindings for the start of a statement expression. */
1360 c_bindings_start_stmt_expr (struct c_spot_bindings
* switch_bindings
)
1362 struct c_scope
*scope
;
1364 for (scope
= current_scope
; scope
!= NULL
; scope
= scope
->outer
)
1366 struct c_binding
*b
;
1368 if (!scope
->has_label_bindings
)
1371 for (b
= scope
->bindings
; b
!= NULL
; b
= b
->prev
)
1373 struct c_label_vars
*label_vars
;
1375 struct c_goto_bindings
*g
;
1377 if (TREE_CODE (b
->decl
) != LABEL_DECL
)
1379 label_vars
= b
->u
.label
;
1380 ++label_vars
->label_bindings
.stmt_exprs
;
1381 FOR_EACH_VEC_SAFE_ELT (label_vars
->gotos
, ix
, g
)
1382 ++g
->goto_bindings
.stmt_exprs
;
1386 if (switch_bindings
!= NULL
)
1387 ++switch_bindings
->stmt_exprs
;
1390 /* Adjust the bindings for the end of a statement expression. */
1393 c_bindings_end_stmt_expr (struct c_spot_bindings
*switch_bindings
)
1395 struct c_scope
*scope
;
1397 for (scope
= current_scope
; scope
!= NULL
; scope
= scope
->outer
)
1399 struct c_binding
*b
;
1401 if (!scope
->has_label_bindings
)
1404 for (b
= scope
->bindings
; b
!= NULL
; b
= b
->prev
)
1406 struct c_label_vars
*label_vars
;
1408 struct c_goto_bindings
*g
;
1410 if (TREE_CODE (b
->decl
) != LABEL_DECL
)
1412 label_vars
= b
->u
.label
;
1413 --label_vars
->label_bindings
.stmt_exprs
;
1414 if (label_vars
->label_bindings
.stmt_exprs
< 0)
1416 label_vars
->label_bindings
.left_stmt_expr
= true;
1417 label_vars
->label_bindings
.stmt_exprs
= 0;
1419 FOR_EACH_VEC_SAFE_ELT (label_vars
->gotos
, ix
, g
)
1421 --g
->goto_bindings
.stmt_exprs
;
1422 if (g
->goto_bindings
.stmt_exprs
< 0)
1424 g
->goto_bindings
.left_stmt_expr
= true;
1425 g
->goto_bindings
.stmt_exprs
= 0;
1431 if (switch_bindings
!= NULL
)
1433 --switch_bindings
->stmt_exprs
;
1434 gcc_assert (switch_bindings
->stmt_exprs
>= 0);
1438 /* Push a definition or a declaration of struct, union or enum tag "name".
1439 "type" should be the type node.
1440 We assume that the tag "name" is not already defined, and has a location
1443 Note that the definition may really be just a forward reference.
1444 In that case, the TYPE_SIZE will be zero. */
1447 pushtag (location_t loc
, tree name
, tree type
)
1449 /* Record the identifier as the type's name if it has none. */
1450 if (name
&& !TYPE_NAME (type
))
1451 TYPE_NAME (type
) = name
;
1452 bind (name
, type
, current_scope
, /*invisible=*/false, /*nested=*/false, loc
);
1454 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1455 tagged type we just added to the current scope. This fake
1456 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1457 to output a representation of a tagged type, and it also gives
1458 us a convenient place to record the "scope start" address for the
1461 TYPE_STUB_DECL (type
) = pushdecl (build_decl (loc
,
1462 TYPE_DECL
, NULL_TREE
, type
));
1464 /* An approximation for now, so we can tell this is a function-scope tag.
1465 This will be updated in pop_scope. */
1466 TYPE_CONTEXT (type
) = DECL_CONTEXT (TYPE_STUB_DECL (type
));
1468 if (warn_cxx_compat
&& name
!= NULL_TREE
)
1470 struct c_binding
*b
= I_SYMBOL_BINDING (name
);
1473 && b
->decl
!= NULL_TREE
1474 && TREE_CODE (b
->decl
) == TYPE_DECL
1475 && (B_IN_CURRENT_SCOPE (b
)
1476 || (current_scope
== file_scope
&& B_IN_EXTERNAL_SCOPE (b
)))
1477 && (TYPE_MAIN_VARIANT (TREE_TYPE (b
->decl
))
1478 != TYPE_MAIN_VARIANT (type
)))
1480 warning_at (loc
, OPT_Wc___compat
,
1481 ("using %qD as both a typedef and a tag is "
1484 if (b
->locus
!= UNKNOWN_LOCATION
)
1485 inform (b
->locus
, "originally defined here");
1490 /* Subroutine of compare_decls. Allow harmless mismatches in return
1491 and argument types provided that the type modes match. This function
1492 return a unified type given a suitable match, and 0 otherwise. */
1495 match_builtin_function_types (tree newtype
, tree oldtype
)
1497 tree newrettype
, oldrettype
;
1498 tree newargs
, oldargs
;
1499 tree trytype
, tryargs
;
1501 /* Accept the return type of the new declaration if same modes. */
1502 oldrettype
= TREE_TYPE (oldtype
);
1503 newrettype
= TREE_TYPE (newtype
);
1505 if (TYPE_MODE (oldrettype
) != TYPE_MODE (newrettype
))
1508 oldargs
= TYPE_ARG_TYPES (oldtype
);
1509 newargs
= TYPE_ARG_TYPES (newtype
);
1512 while (oldargs
|| newargs
)
1516 || !TREE_VALUE (oldargs
)
1517 || !TREE_VALUE (newargs
)
1518 || TYPE_MODE (TREE_VALUE (oldargs
))
1519 != TYPE_MODE (TREE_VALUE (newargs
)))
1522 oldargs
= TREE_CHAIN (oldargs
);
1523 newargs
= TREE_CHAIN (newargs
);
1526 trytype
= build_function_type (newrettype
, tryargs
);
1527 return build_type_attribute_variant (trytype
, TYPE_ATTRIBUTES (oldtype
));
1530 /* Subroutine of diagnose_mismatched_decls. Check for function type
1531 mismatch involving an empty arglist vs a nonempty one and give clearer
1534 diagnose_arglist_conflict (tree newdecl
, tree olddecl
,
1535 tree newtype
, tree oldtype
)
1539 if (TREE_CODE (olddecl
) != FUNCTION_DECL
1540 || !comptypes (TREE_TYPE (oldtype
), TREE_TYPE (newtype
))
1541 || !((!prototype_p (oldtype
) && DECL_INITIAL (olddecl
) == 0)
1542 || (!prototype_p (newtype
) && DECL_INITIAL (newdecl
) == 0)))
1545 t
= TYPE_ARG_TYPES (oldtype
);
1547 t
= TYPE_ARG_TYPES (newtype
);
1548 for (; t
; t
= TREE_CHAIN (t
))
1550 tree type
= TREE_VALUE (t
);
1552 if (TREE_CHAIN (t
) == 0
1553 && TYPE_MAIN_VARIANT (type
) != void_type_node
)
1555 inform (input_location
, "a parameter list with an ellipsis can%'t match "
1556 "an empty parameter name list declaration");
1560 if (c_type_promotes_to (type
) != type
)
1562 inform (input_location
, "an argument type that has a default promotion can%'t match "
1563 "an empty parameter name list declaration");
1569 /* Another subroutine of diagnose_mismatched_decls. OLDDECL is an
1570 old-style function definition, NEWDECL is a prototype declaration.
1571 Diagnose inconsistencies in the argument list. Returns TRUE if
1572 the prototype is compatible, FALSE if not. */
1574 validate_proto_after_old_defn (tree newdecl
, tree newtype
, tree oldtype
)
1576 tree newargs
, oldargs
;
1579 #define END_OF_ARGLIST(t) ((t) == void_type_node)
1581 oldargs
= TYPE_ACTUAL_ARG_TYPES (oldtype
);
1582 newargs
= TYPE_ARG_TYPES (newtype
);
1587 tree oldargtype
= TREE_VALUE (oldargs
);
1588 tree newargtype
= TREE_VALUE (newargs
);
1590 if (oldargtype
== error_mark_node
|| newargtype
== error_mark_node
)
1593 oldargtype
= (TYPE_ATOMIC (oldargtype
)
1594 ? c_build_qualified_type (TYPE_MAIN_VARIANT (oldargtype
),
1596 : TYPE_MAIN_VARIANT (oldargtype
));
1597 newargtype
= (TYPE_ATOMIC (newargtype
)
1598 ? c_build_qualified_type (TYPE_MAIN_VARIANT (newargtype
),
1600 : TYPE_MAIN_VARIANT (newargtype
));
1602 if (END_OF_ARGLIST (oldargtype
) && END_OF_ARGLIST (newargtype
))
1605 /* Reaching the end of just one list means the two decls don't
1606 agree on the number of arguments. */
1607 if (END_OF_ARGLIST (oldargtype
))
1609 error ("prototype for %q+D declares more arguments "
1610 "than previous old-style definition", newdecl
);
1613 else if (END_OF_ARGLIST (newargtype
))
1615 error ("prototype for %q+D declares fewer arguments "
1616 "than previous old-style definition", newdecl
);
1620 /* Type for passing arg must be consistent with that declared
1622 else if (!comptypes (oldargtype
, newargtype
))
1624 error ("prototype for %q+D declares argument %d"
1625 " with incompatible type",
1630 oldargs
= TREE_CHAIN (oldargs
);
1631 newargs
= TREE_CHAIN (newargs
);
1635 /* If we get here, no errors were found, but do issue a warning
1636 for this poor-style construct. */
1637 warning (0, "prototype for %q+D follows non-prototype definition",
1640 #undef END_OF_ARGLIST
1643 /* Subroutine of diagnose_mismatched_decls. Report the location of DECL,
1644 first in a pair of mismatched declarations, using the diagnostic
1647 locate_old_decl (tree decl
)
1649 if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_BUILT_IN (decl
)
1650 && !C_DECL_DECLARED_BUILTIN (decl
))
1652 else if (DECL_INITIAL (decl
))
1653 inform (input_location
, "previous definition of %q+D was here", decl
);
1654 else if (C_DECL_IMPLICIT (decl
))
1655 inform (input_location
, "previous implicit declaration of %q+D was here", decl
);
1657 inform (input_location
, "previous declaration of %q+D was here", decl
);
1660 /* Subroutine of duplicate_decls. Compare NEWDECL to OLDDECL.
1661 Returns true if the caller should proceed to merge the two, false
1662 if OLDDECL should simply be discarded. As a side effect, issues
1663 all necessary diagnostics for invalid or poor-style combinations.
1664 If it returns true, writes the types of NEWDECL and OLDDECL to
1665 *NEWTYPEP and *OLDTYPEP - these may have been adjusted from
1666 TREE_TYPE (NEWDECL, OLDDECL) respectively. */
1669 diagnose_mismatched_decls (tree newdecl
, tree olddecl
,
1670 tree
*newtypep
, tree
*oldtypep
)
1672 tree newtype
, oldtype
;
1673 bool pedwarned
= false;
1674 bool warned
= false;
1677 #define DECL_EXTERN_INLINE(DECL) (DECL_DECLARED_INLINE_P (DECL) \
1678 && DECL_EXTERNAL (DECL))
1680 /* If we have error_mark_node for either decl or type, just discard
1681 the previous decl - we're in an error cascade already. */
1682 if (olddecl
== error_mark_node
|| newdecl
== error_mark_node
)
1684 *oldtypep
= oldtype
= TREE_TYPE (olddecl
);
1685 *newtypep
= newtype
= TREE_TYPE (newdecl
);
1686 if (oldtype
== error_mark_node
|| newtype
== error_mark_node
)
1689 /* Two different categories of symbol altogether. This is an error
1690 unless OLDDECL is a builtin. OLDDECL will be discarded in any case. */
1691 if (TREE_CODE (olddecl
) != TREE_CODE (newdecl
))
1693 if (!(TREE_CODE (olddecl
) == FUNCTION_DECL
1694 && DECL_BUILT_IN (olddecl
)
1695 && !C_DECL_DECLARED_BUILTIN (olddecl
)))
1697 error ("%q+D redeclared as different kind of symbol", newdecl
);
1698 locate_old_decl (olddecl
);
1700 else if (TREE_PUBLIC (newdecl
))
1701 warning (0, "built-in function %q+D declared as non-function",
1704 warning (OPT_Wshadow
, "declaration of %q+D shadows "
1705 "a built-in function", newdecl
);
1709 /* Enumerators have no linkage, so may only be declared once in a
1711 if (TREE_CODE (olddecl
) == CONST_DECL
)
1713 error ("redeclaration of enumerator %q+D", newdecl
);
1714 locate_old_decl (olddecl
);
1718 if (!comptypes (oldtype
, newtype
))
1720 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1721 && DECL_BUILT_IN (olddecl
) && !C_DECL_DECLARED_BUILTIN (olddecl
))
1723 /* Accept harmless mismatch in function types.
1724 This is for the ffs and fprintf builtins. */
1725 tree trytype
= match_builtin_function_types (newtype
, oldtype
);
1727 if (trytype
&& comptypes (newtype
, trytype
))
1728 *oldtypep
= oldtype
= trytype
;
1731 /* If types don't match for a built-in, throw away the
1732 built-in. No point in calling locate_old_decl here, it
1733 won't print anything. */
1734 warning (0, "conflicting types for built-in function %q+D",
1739 else if (TREE_CODE (olddecl
) == FUNCTION_DECL
1740 && DECL_IS_BUILTIN (olddecl
))
1742 /* A conflicting function declaration for a predeclared
1743 function that isn't actually built in. Objective C uses
1744 these. The new declaration silently overrides everything
1745 but the volatility (i.e. noreturn) indication. See also
1746 below. FIXME: Make Objective C use normal builtins. */
1747 TREE_THIS_VOLATILE (newdecl
) |= TREE_THIS_VOLATILE (olddecl
);
1750 /* Permit void foo (...) to match int foo (...) if the latter is
1751 the definition and implicit int was used. See
1752 c-torture/compile/920625-2.c. */
1753 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
&& DECL_INITIAL (newdecl
)
1754 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype
)) == void_type_node
1755 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype
)) == integer_type_node
1756 && C_FUNCTION_IMPLICIT_INT (newdecl
) && !DECL_INITIAL (olddecl
))
1758 pedwarned
= pedwarn (input_location
, 0,
1759 "conflicting types for %q+D", newdecl
);
1760 /* Make sure we keep void as the return type. */
1761 TREE_TYPE (newdecl
) = *newtypep
= newtype
= oldtype
;
1762 C_FUNCTION_IMPLICIT_INT (newdecl
) = 0;
1764 /* Permit void foo (...) to match an earlier call to foo (...) with
1765 no declared type (thus, implicitly int). */
1766 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
1767 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype
)) == void_type_node
1768 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype
)) == integer_type_node
1769 && C_DECL_IMPLICIT (olddecl
) && !DECL_INITIAL (olddecl
))
1771 pedwarned
= pedwarn (input_location
, 0,
1772 "conflicting types for %q+D", newdecl
);
1773 /* Make sure we keep void as the return type. */
1774 TREE_TYPE (olddecl
) = *oldtypep
= oldtype
= newtype
;
1778 int new_quals
= TYPE_QUALS (newtype
);
1779 int old_quals
= TYPE_QUALS (oldtype
);
1781 if (new_quals
!= old_quals
)
1783 addr_space_t new_addr
= DECODE_QUAL_ADDR_SPACE (new_quals
);
1784 addr_space_t old_addr
= DECODE_QUAL_ADDR_SPACE (old_quals
);
1785 if (new_addr
!= old_addr
)
1787 if (ADDR_SPACE_GENERIC_P (new_addr
))
1788 error ("conflicting named address spaces (generic vs %s) "
1790 c_addr_space_name (old_addr
), newdecl
);
1791 else if (ADDR_SPACE_GENERIC_P (old_addr
))
1792 error ("conflicting named address spaces (%s vs generic) "
1794 c_addr_space_name (new_addr
), newdecl
);
1796 error ("conflicting named address spaces (%s vs %s) "
1798 c_addr_space_name (new_addr
),
1799 c_addr_space_name (old_addr
),
1803 if (CLEAR_QUAL_ADDR_SPACE (new_quals
)
1804 != CLEAR_QUAL_ADDR_SPACE (old_quals
))
1805 error ("conflicting type qualifiers for %q+D", newdecl
);
1808 error ("conflicting types for %q+D", newdecl
);
1809 diagnose_arglist_conflict (newdecl
, olddecl
, newtype
, oldtype
);
1810 locate_old_decl (olddecl
);
1815 /* Redeclaration of a type is a constraint violation (6.7.2.3p1),
1816 but silently ignore the redeclaration if either is in a system
1817 header. (Conflicting redeclarations were handled above.) This
1818 is allowed for C11 if the types are the same, not just
1820 if (TREE_CODE (newdecl
) == TYPE_DECL
)
1822 bool types_different
= false;
1823 int comptypes_result
;
1826 = comptypes_check_different_types (oldtype
, newtype
, &types_different
);
1828 if (comptypes_result
!= 1 || types_different
)
1830 error ("redefinition of typedef %q+D with different type", newdecl
);
1831 locate_old_decl (olddecl
);
1835 if (DECL_IN_SYSTEM_HEADER (newdecl
)
1836 || DECL_IN_SYSTEM_HEADER (olddecl
)
1837 || TREE_NO_WARNING (newdecl
)
1838 || TREE_NO_WARNING (olddecl
))
1839 return true; /* Allow OLDDECL to continue in use. */
1841 if (variably_modified_type_p (newtype
, NULL
))
1843 error ("redefinition of typedef %q+D with variably modified type",
1845 locate_old_decl (olddecl
);
1847 else if (pedantic
&& !flag_isoc11
)
1849 pedwarn (input_location
, OPT_Wpedantic
,
1850 "redefinition of typedef %q+D", newdecl
);
1851 locate_old_decl (olddecl
);
1857 /* Function declarations can either be 'static' or 'extern' (no
1858 qualifier is equivalent to 'extern' - C99 6.2.2p5) and therefore
1859 can never conflict with each other on account of linkage
1860 (6.2.2p4). Multiple definitions are not allowed (6.9p3,5) but
1861 gnu89 mode permits two definitions if one is 'extern inline' and
1862 one is not. The non- extern-inline definition supersedes the
1863 extern-inline definition. */
1865 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1867 /* If you declare a built-in function name as static, or
1868 define the built-in with an old-style definition (so we
1869 can't validate the argument list) the built-in definition is
1870 overridden, but optionally warn this was a bad choice of name. */
1871 if (DECL_BUILT_IN (olddecl
)
1872 && !C_DECL_DECLARED_BUILTIN (olddecl
)
1873 && (!TREE_PUBLIC (newdecl
)
1874 || (DECL_INITIAL (newdecl
)
1875 && !prototype_p (TREE_TYPE (newdecl
)))))
1877 warning (OPT_Wshadow
, "declaration of %q+D shadows "
1878 "a built-in function", newdecl
);
1879 /* Discard the old built-in function. */
1883 if (DECL_INITIAL (newdecl
))
1885 if (DECL_INITIAL (olddecl
))
1887 /* If both decls are in the same TU and the new declaration
1888 isn't overriding an extern inline reject the new decl.
1889 In c99, no overriding is allowed in the same translation
1891 if ((!DECL_EXTERN_INLINE (olddecl
)
1892 || DECL_EXTERN_INLINE (newdecl
)
1893 || (!flag_gnu89_inline
1894 && (!DECL_DECLARED_INLINE_P (olddecl
)
1895 || !lookup_attribute ("gnu_inline",
1896 DECL_ATTRIBUTES (olddecl
)))
1897 && (!DECL_DECLARED_INLINE_P (newdecl
)
1898 || !lookup_attribute ("gnu_inline",
1899 DECL_ATTRIBUTES (newdecl
))))
1901 && same_translation_unit_p (newdecl
, olddecl
))
1903 error ("redefinition of %q+D", newdecl
);
1904 locate_old_decl (olddecl
);
1909 /* If we have a prototype after an old-style function definition,
1910 the argument types must be checked specially. */
1911 else if (DECL_INITIAL (olddecl
)
1912 && !prototype_p (oldtype
) && prototype_p (newtype
)
1913 && TYPE_ACTUAL_ARG_TYPES (oldtype
)
1914 && !validate_proto_after_old_defn (newdecl
, newtype
, oldtype
))
1916 locate_old_decl (olddecl
);
1919 /* A non-static declaration (even an "extern") followed by a
1920 static declaration is undefined behavior per C99 6.2.2p3-5,7.
1921 The same is true for a static forward declaration at block
1922 scope followed by a non-static declaration/definition at file
1923 scope. Static followed by non-static at the same scope is
1924 not undefined behavior, and is the most convenient way to get
1925 some effects (see e.g. what unwind-dw2-fde-glibc.c does to
1926 the definition of _Unwind_Find_FDE in unwind-dw2-fde.c), but
1927 we do diagnose it if -Wtraditional. */
1928 if (TREE_PUBLIC (olddecl
) && !TREE_PUBLIC (newdecl
))
1930 /* Two exceptions to the rule. If olddecl is an extern
1931 inline, or a predeclared function that isn't actually
1932 built in, newdecl silently overrides olddecl. The latter
1933 occur only in Objective C; see also above. (FIXME: Make
1934 Objective C use normal builtins.) */
1935 if (!DECL_IS_BUILTIN (olddecl
)
1936 && !DECL_EXTERN_INLINE (olddecl
))
1938 error ("static declaration of %q+D follows "
1939 "non-static declaration", newdecl
);
1940 locate_old_decl (olddecl
);
1944 else if (TREE_PUBLIC (newdecl
) && !TREE_PUBLIC (olddecl
))
1946 if (DECL_CONTEXT (olddecl
))
1948 error ("non-static declaration of %q+D follows "
1949 "static declaration", newdecl
);
1950 locate_old_decl (olddecl
);
1953 else if (warn_traditional
)
1955 warned
|= warning (OPT_Wtraditional
,
1956 "non-static declaration of %q+D "
1957 "follows static declaration", newdecl
);
1961 /* Make sure gnu_inline attribute is either not present, or
1962 present on all inline decls. */
1963 if (DECL_DECLARED_INLINE_P (olddecl
)
1964 && DECL_DECLARED_INLINE_P (newdecl
))
1966 bool newa
= lookup_attribute ("gnu_inline",
1967 DECL_ATTRIBUTES (newdecl
)) != NULL
;
1968 bool olda
= lookup_attribute ("gnu_inline",
1969 DECL_ATTRIBUTES (olddecl
)) != NULL
;
1972 error_at (input_location
, "%<gnu_inline%> attribute present on %q+D",
1973 newa
? newdecl
: olddecl
);
1974 error_at (DECL_SOURCE_LOCATION (newa
? olddecl
: newdecl
),
1979 else if (TREE_CODE (newdecl
) == VAR_DECL
)
1981 /* Only variables can be thread-local, and all declarations must
1982 agree on this property. */
1983 if (C_DECL_THREADPRIVATE_P (olddecl
) && !DECL_THREAD_LOCAL_P (newdecl
))
1985 /* Nothing to check. Since OLDDECL is marked threadprivate
1986 and NEWDECL does not have a thread-local attribute, we
1987 will merge the threadprivate attribute into NEWDECL. */
1990 else if (DECL_THREAD_LOCAL_P (newdecl
) != DECL_THREAD_LOCAL_P (olddecl
))
1992 if (DECL_THREAD_LOCAL_P (newdecl
))
1993 error ("thread-local declaration of %q+D follows "
1994 "non-thread-local declaration", newdecl
);
1996 error ("non-thread-local declaration of %q+D follows "
1997 "thread-local declaration", newdecl
);
1999 locate_old_decl (olddecl
);
2003 /* Multiple initialized definitions are not allowed (6.9p3,5). */
2004 if (DECL_INITIAL (newdecl
) && DECL_INITIAL (olddecl
))
2006 error ("redefinition of %q+D", newdecl
);
2007 locate_old_decl (olddecl
);
2011 /* Objects declared at file scope: if the first declaration had
2012 external linkage (even if it was an external reference) the
2013 second must have external linkage as well, or the behavior is
2014 undefined. If the first declaration had internal linkage, then
2015 the second must too, or else be an external reference (in which
2016 case the composite declaration still has internal linkage).
2017 As for function declarations, we warn about the static-then-
2018 extern case only for -Wtraditional. See generally 6.2.2p3-5,7. */
2019 if (DECL_FILE_SCOPE_P (newdecl
)
2020 && TREE_PUBLIC (newdecl
) != TREE_PUBLIC (olddecl
))
2022 if (DECL_EXTERNAL (newdecl
))
2024 if (!DECL_FILE_SCOPE_P (olddecl
))
2026 error ("extern declaration of %q+D follows "
2027 "declaration with no linkage", newdecl
);
2028 locate_old_decl (olddecl
);
2031 else if (warn_traditional
)
2033 warned
|= warning (OPT_Wtraditional
,
2034 "non-static declaration of %q+D "
2035 "follows static declaration", newdecl
);
2040 if (TREE_PUBLIC (newdecl
))
2041 error ("non-static declaration of %q+D follows "
2042 "static declaration", newdecl
);
2044 error ("static declaration of %q+D follows "
2045 "non-static declaration", newdecl
);
2047 locate_old_decl (olddecl
);
2051 /* Two objects with the same name declared at the same block
2052 scope must both be external references (6.7p3). */
2053 else if (!DECL_FILE_SCOPE_P (newdecl
))
2055 if (DECL_EXTERNAL (newdecl
))
2057 /* Extern with initializer at block scope, which will
2058 already have received an error. */
2060 else if (DECL_EXTERNAL (olddecl
))
2062 error ("declaration of %q+D with no linkage follows "
2063 "extern declaration", newdecl
);
2064 locate_old_decl (olddecl
);
2068 error ("redeclaration of %q+D with no linkage", newdecl
);
2069 locate_old_decl (olddecl
);
2075 /* C++ does not permit a decl to appear multiple times at file
2078 && DECL_FILE_SCOPE_P (newdecl
)
2079 && !DECL_EXTERNAL (newdecl
)
2080 && !DECL_EXTERNAL (olddecl
))
2081 warned
|= warning_at (DECL_SOURCE_LOCATION (newdecl
),
2083 ("duplicate declaration of %qD is "
2089 /* All decls must agree on a visibility. */
2090 if (CODE_CONTAINS_STRUCT (TREE_CODE (newdecl
), TS_DECL_WITH_VIS
)
2091 && DECL_VISIBILITY_SPECIFIED (newdecl
) && DECL_VISIBILITY_SPECIFIED (olddecl
)
2092 && DECL_VISIBILITY (newdecl
) != DECL_VISIBILITY (olddecl
))
2094 warned
|= warning (0, "redeclaration of %q+D with different visibility "
2095 "(old visibility preserved)", newdecl
);
2098 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2100 /* Diagnose inline __attribute__ ((noinline)) which is silly. */
2101 if (DECL_DECLARED_INLINE_P (newdecl
)
2102 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl
)))
2103 warned
|= warning (OPT_Wattributes
,
2104 "inline declaration of %qD follows "
2105 "declaration with attribute noinline", newdecl
);
2106 else if (DECL_DECLARED_INLINE_P (olddecl
)
2107 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl
)))
2108 warned
|= warning (OPT_Wattributes
,
2109 "declaration of %q+D with attribute "
2110 "noinline follows inline declaration ", newdecl
);
2111 else if (lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl
))
2112 && lookup_attribute ("always_inline", DECL_ATTRIBUTES (olddecl
)))
2113 warned
|= warning (OPT_Wattributes
,
2114 "declaration of %q+D with attribute "
2115 "%qs follows declaration with attribute %qs",
2116 newdecl
, "noinline", "always_inline");
2117 else if (lookup_attribute ("always_inline", DECL_ATTRIBUTES (newdecl
))
2118 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl
)))
2119 warned
|= warning (OPT_Wattributes
,
2120 "declaration of %q+D with attribute "
2121 "%qs follows declaration with attribute %qs",
2122 newdecl
, "always_inline", "noinline");
2123 else if (lookup_attribute ("cold", DECL_ATTRIBUTES (newdecl
))
2124 && lookup_attribute ("hot", DECL_ATTRIBUTES (olddecl
)))
2125 warned
|= warning (OPT_Wattributes
,
2126 "declaration of %q+D with attribute %qs follows "
2127 "declaration with attribute %qs", newdecl
, "cold",
2129 else if (lookup_attribute ("hot", DECL_ATTRIBUTES (newdecl
))
2130 && lookup_attribute ("cold", DECL_ATTRIBUTES (olddecl
)))
2131 warned
|= warning (OPT_Wattributes
,
2132 "declaration of %q+D with attribute %qs follows "
2133 "declaration with attribute %qs", newdecl
, "hot",
2136 else /* PARM_DECL, VAR_DECL */
2138 /* Redeclaration of a parameter is a constraint violation (this is
2139 not explicitly stated, but follows from C99 6.7p3 [no more than
2140 one declaration of the same identifier with no linkage in the
2141 same scope, except type tags] and 6.2.2p6 [parameters have no
2142 linkage]). We must check for a forward parameter declaration,
2143 indicated by TREE_ASM_WRITTEN on the old declaration - this is
2144 an extension, the mandatory diagnostic for which is handled by
2145 mark_forward_parm_decls. */
2147 if (TREE_CODE (newdecl
) == PARM_DECL
2148 && (!TREE_ASM_WRITTEN (olddecl
) || TREE_ASM_WRITTEN (newdecl
)))
2150 error ("redefinition of parameter %q+D", newdecl
);
2151 locate_old_decl (olddecl
);
2156 /* Optional warning for completely redundant decls. */
2157 if (!warned
&& !pedwarned
2158 && warn_redundant_decls
2159 /* Don't warn about a function declaration followed by a
2161 && !(TREE_CODE (newdecl
) == FUNCTION_DECL
2162 && DECL_INITIAL (newdecl
) && !DECL_INITIAL (olddecl
))
2163 /* Don't warn about redundant redeclarations of builtins. */
2164 && !(TREE_CODE (newdecl
) == FUNCTION_DECL
2165 && !DECL_BUILT_IN (newdecl
)
2166 && DECL_BUILT_IN (olddecl
)
2167 && !C_DECL_DECLARED_BUILTIN (olddecl
))
2168 /* Don't warn about an extern followed by a definition. */
2169 && !(DECL_EXTERNAL (olddecl
) && !DECL_EXTERNAL (newdecl
))
2170 /* Don't warn about forward parameter decls. */
2171 && !(TREE_CODE (newdecl
) == PARM_DECL
2172 && TREE_ASM_WRITTEN (olddecl
) && !TREE_ASM_WRITTEN (newdecl
))
2173 /* Don't warn about a variable definition following a declaration. */
2174 && !(TREE_CODE (newdecl
) == VAR_DECL
2175 && DECL_INITIAL (newdecl
) && !DECL_INITIAL (olddecl
)))
2177 warned
= warning (OPT_Wredundant_decls
, "redundant redeclaration of %q+D",
2181 /* Report location of previous decl/defn. */
2182 if (warned
|| pedwarned
)
2183 locate_old_decl (olddecl
);
2185 #undef DECL_EXTERN_INLINE
2190 /* Subroutine of duplicate_decls. NEWDECL has been found to be
2191 consistent with OLDDECL, but carries new information. Merge the
2192 new information into OLDDECL. This function issues no
2196 merge_decls (tree newdecl
, tree olddecl
, tree newtype
, tree oldtype
)
2198 bool new_is_definition
= (TREE_CODE (newdecl
) == FUNCTION_DECL
2199 && DECL_INITIAL (newdecl
) != 0);
2200 bool new_is_prototype
= (TREE_CODE (newdecl
) == FUNCTION_DECL
2201 && prototype_p (TREE_TYPE (newdecl
)));
2202 bool old_is_prototype
= (TREE_CODE (olddecl
) == FUNCTION_DECL
2203 && prototype_p (TREE_TYPE (olddecl
)));
2205 /* For real parm decl following a forward decl, rechain the old decl
2206 in its new location and clear TREE_ASM_WRITTEN (it's not a
2207 forward decl anymore). */
2208 if (TREE_CODE (newdecl
) == PARM_DECL
2209 && TREE_ASM_WRITTEN (olddecl
) && !TREE_ASM_WRITTEN (newdecl
))
2211 struct c_binding
*b
, **here
;
2213 for (here
= ¤t_scope
->bindings
; *here
; here
= &(*here
)->prev
)
2214 if ((*here
)->decl
== olddecl
)
2221 b
->prev
= current_scope
->bindings
;
2222 current_scope
->bindings
= b
;
2224 TREE_ASM_WRITTEN (olddecl
) = 0;
2227 DECL_ATTRIBUTES (newdecl
)
2228 = targetm
.merge_decl_attributes (olddecl
, newdecl
);
2230 /* Merge the data types specified in the two decls. */
2232 = TREE_TYPE (olddecl
)
2233 = composite_type (newtype
, oldtype
);
2235 /* Lay the type out, unless already done. */
2236 if (!comptypes (oldtype
, TREE_TYPE (newdecl
)))
2238 if (TREE_TYPE (newdecl
) != error_mark_node
)
2239 layout_type (TREE_TYPE (newdecl
));
2240 if (TREE_CODE (newdecl
) != FUNCTION_DECL
2241 && TREE_CODE (newdecl
) != TYPE_DECL
2242 && TREE_CODE (newdecl
) != CONST_DECL
)
2243 layout_decl (newdecl
, 0);
2247 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
2248 DECL_SIZE (newdecl
) = DECL_SIZE (olddecl
);
2249 DECL_SIZE_UNIT (newdecl
) = DECL_SIZE_UNIT (olddecl
);
2250 DECL_MODE (newdecl
) = DECL_MODE (olddecl
);
2251 if (DECL_ALIGN (olddecl
) > DECL_ALIGN (newdecl
))
2253 DECL_ALIGN (newdecl
) = DECL_ALIGN (olddecl
);
2254 DECL_USER_ALIGN (newdecl
) |= DECL_USER_ALIGN (olddecl
);
2258 /* Keep the old rtl since we can safely use it. */
2259 if (HAS_RTL_P (olddecl
))
2260 COPY_DECL_RTL (olddecl
, newdecl
);
2262 /* Merge the type qualifiers. */
2263 if (TREE_READONLY (newdecl
))
2264 TREE_READONLY (olddecl
) = 1;
2266 if (TREE_THIS_VOLATILE (newdecl
))
2267 TREE_THIS_VOLATILE (olddecl
) = 1;
2269 /* Merge deprecatedness. */
2270 if (TREE_DEPRECATED (newdecl
))
2271 TREE_DEPRECATED (olddecl
) = 1;
2273 /* If a decl is in a system header and the other isn't, keep the one on the
2274 system header. Otherwise, keep source location of definition rather than
2275 declaration and of prototype rather than non-prototype unless that
2276 prototype is built-in. */
2277 if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl
), TS_DECL_WITH_VIS
)
2278 && DECL_IN_SYSTEM_HEADER (olddecl
)
2279 && !DECL_IN_SYSTEM_HEADER (newdecl
) )
2280 DECL_SOURCE_LOCATION (newdecl
) = DECL_SOURCE_LOCATION (olddecl
);
2281 else if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl
), TS_DECL_WITH_VIS
)
2282 && DECL_IN_SYSTEM_HEADER (newdecl
)
2283 && !DECL_IN_SYSTEM_HEADER (olddecl
))
2284 DECL_SOURCE_LOCATION (olddecl
) = DECL_SOURCE_LOCATION (newdecl
);
2285 else if ((DECL_INITIAL (newdecl
) == 0 && DECL_INITIAL (olddecl
) != 0)
2286 || (old_is_prototype
&& !new_is_prototype
2287 && !C_DECL_BUILTIN_PROTOTYPE (olddecl
)))
2288 DECL_SOURCE_LOCATION (newdecl
) = DECL_SOURCE_LOCATION (olddecl
);
2290 /* Merge the initialization information. */
2291 if (DECL_INITIAL (newdecl
) == 0)
2292 DECL_INITIAL (newdecl
) = DECL_INITIAL (olddecl
);
2294 /* Merge the threadprivate attribute. */
2295 if (TREE_CODE (olddecl
) == VAR_DECL
&& C_DECL_THREADPRIVATE_P (olddecl
))
2297 set_decl_tls_model (newdecl
, DECL_TLS_MODEL (olddecl
));
2298 C_DECL_THREADPRIVATE_P (newdecl
) = 1;
2301 if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl
), TS_DECL_WITH_VIS
))
2303 /* Merge the section attribute.
2304 We want to issue an error if the sections conflict but that
2305 must be done later in decl_attributes since we are called
2306 before attributes are assigned. */
2307 if ((DECL_EXTERNAL (olddecl
) || TREE_PUBLIC (olddecl
) || TREE_STATIC (olddecl
))
2308 && DECL_SECTION_NAME (newdecl
) == NULL
2309 && DECL_SECTION_NAME (olddecl
))
2310 set_decl_section_name (newdecl
, DECL_SECTION_NAME (olddecl
));
2312 /* Copy the assembler name.
2313 Currently, it can only be defined in the prototype. */
2314 COPY_DECL_ASSEMBLER_NAME (olddecl
, newdecl
);
2316 /* Use visibility of whichever declaration had it specified */
2317 if (DECL_VISIBILITY_SPECIFIED (olddecl
))
2319 DECL_VISIBILITY (newdecl
) = DECL_VISIBILITY (olddecl
);
2320 DECL_VISIBILITY_SPECIFIED (newdecl
) = 1;
2323 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2325 DECL_STATIC_CONSTRUCTOR(newdecl
) |= DECL_STATIC_CONSTRUCTOR(olddecl
);
2326 DECL_STATIC_DESTRUCTOR (newdecl
) |= DECL_STATIC_DESTRUCTOR (olddecl
);
2327 DECL_NO_LIMIT_STACK (newdecl
) |= DECL_NO_LIMIT_STACK (olddecl
);
2328 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl
)
2329 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl
);
2330 TREE_THIS_VOLATILE (newdecl
) |= TREE_THIS_VOLATILE (olddecl
);
2331 DECL_IS_MALLOC (newdecl
) |= DECL_IS_MALLOC (olddecl
);
2332 DECL_IS_OPERATOR_NEW (newdecl
) |= DECL_IS_OPERATOR_NEW (olddecl
);
2333 TREE_READONLY (newdecl
) |= TREE_READONLY (olddecl
);
2334 DECL_PURE_P (newdecl
) |= DECL_PURE_P (olddecl
);
2335 DECL_IS_NOVOPS (newdecl
) |= DECL_IS_NOVOPS (olddecl
);
2338 /* Merge the storage class information. */
2339 merge_weak (newdecl
, olddecl
);
2341 /* For functions, static overrides non-static. */
2342 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2344 TREE_PUBLIC (newdecl
) &= TREE_PUBLIC (olddecl
);
2345 /* This is since we don't automatically
2346 copy the attributes of NEWDECL into OLDDECL. */
2347 TREE_PUBLIC (olddecl
) = TREE_PUBLIC (newdecl
);
2348 /* If this clears `static', clear it in the identifier too. */
2349 if (!TREE_PUBLIC (olddecl
))
2350 TREE_PUBLIC (DECL_NAME (olddecl
)) = 0;
2354 /* In c99, 'extern' declaration before (or after) 'inline' means this
2355 function is not DECL_EXTERNAL, unless 'gnu_inline' attribute
2357 if (TREE_CODE (newdecl
) == FUNCTION_DECL
2358 && !flag_gnu89_inline
2359 && (DECL_DECLARED_INLINE_P (newdecl
)
2360 || DECL_DECLARED_INLINE_P (olddecl
))
2361 && (!DECL_DECLARED_INLINE_P (newdecl
)
2362 || !DECL_DECLARED_INLINE_P (olddecl
)
2363 || !DECL_EXTERNAL (olddecl
))
2364 && DECL_EXTERNAL (newdecl
)
2365 && !lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (newdecl
))
2366 && !current_function_decl
)
2367 DECL_EXTERNAL (newdecl
) = 0;
2369 /* An inline definition following a static declaration is not
2371 if (new_is_definition
2372 && (DECL_DECLARED_INLINE_P (newdecl
)
2373 || DECL_DECLARED_INLINE_P (olddecl
))
2374 && !TREE_PUBLIC (olddecl
))
2375 DECL_EXTERNAL (newdecl
) = 0;
2377 if (DECL_EXTERNAL (newdecl
))
2379 TREE_STATIC (newdecl
) = TREE_STATIC (olddecl
);
2380 DECL_EXTERNAL (newdecl
) = DECL_EXTERNAL (olddecl
);
2382 /* An extern decl does not override previous storage class. */
2383 TREE_PUBLIC (newdecl
) = TREE_PUBLIC (olddecl
);
2384 if (!DECL_EXTERNAL (newdecl
))
2386 DECL_CONTEXT (newdecl
) = DECL_CONTEXT (olddecl
);
2387 DECL_COMMON (newdecl
) = DECL_COMMON (olddecl
);
2392 TREE_STATIC (olddecl
) = TREE_STATIC (newdecl
);
2393 TREE_PUBLIC (olddecl
) = TREE_PUBLIC (newdecl
);
2396 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2398 /* If we're redefining a function previously defined as extern
2399 inline, make sure we emit debug info for the inline before we
2400 throw it away, in case it was inlined into a function that
2401 hasn't been written out yet. */
2402 if (new_is_definition
&& DECL_INITIAL (olddecl
))
2403 /* The new defn must not be inline. */
2404 DECL_UNINLINABLE (newdecl
) = 1;
2407 /* If either decl says `inline', this fn is inline, unless
2408 its definition was passed already. */
2409 if (DECL_DECLARED_INLINE_P (newdecl
)
2410 || DECL_DECLARED_INLINE_P (olddecl
))
2411 DECL_DECLARED_INLINE_P (newdecl
) = 1;
2413 DECL_UNINLINABLE (newdecl
) = DECL_UNINLINABLE (olddecl
)
2414 = (DECL_UNINLINABLE (newdecl
) || DECL_UNINLINABLE (olddecl
));
2416 DECL_DISREGARD_INLINE_LIMITS (newdecl
)
2417 = DECL_DISREGARD_INLINE_LIMITS (olddecl
)
2418 = (DECL_DISREGARD_INLINE_LIMITS (newdecl
)
2419 || DECL_DISREGARD_INLINE_LIMITS (olddecl
));
2422 if (DECL_BUILT_IN (olddecl
))
2424 /* If redeclaring a builtin function, it stays built in.
2425 But it gets tagged as having been declared. */
2426 DECL_BUILT_IN_CLASS (newdecl
) = DECL_BUILT_IN_CLASS (olddecl
);
2427 DECL_FUNCTION_CODE (newdecl
) = DECL_FUNCTION_CODE (olddecl
);
2428 C_DECL_DECLARED_BUILTIN (newdecl
) = 1;
2429 if (new_is_prototype
)
2431 C_DECL_BUILTIN_PROTOTYPE (newdecl
) = 0;
2432 if (DECL_BUILT_IN_CLASS (newdecl
) == BUILT_IN_NORMAL
)
2434 enum built_in_function fncode
= DECL_FUNCTION_CODE (newdecl
);
2437 /* If a compatible prototype of these builtin functions
2438 is seen, assume the runtime implements it with the
2439 expected semantics. */
2440 case BUILT_IN_STPCPY
:
2441 if (builtin_decl_explicit_p (fncode
))
2442 set_builtin_decl_implicit_p (fncode
, true);
2450 C_DECL_BUILTIN_PROTOTYPE (newdecl
)
2451 = C_DECL_BUILTIN_PROTOTYPE (olddecl
);
2454 /* Preserve function specific target and optimization options */
2455 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl
)
2456 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl
))
2457 DECL_FUNCTION_SPECIFIC_TARGET (newdecl
)
2458 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl
);
2460 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl
)
2461 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl
))
2462 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl
)
2463 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl
);
2465 /* Also preserve various other info from the definition. */
2466 if (!new_is_definition
)
2469 DECL_RESULT (newdecl
) = DECL_RESULT (olddecl
);
2470 DECL_INITIAL (newdecl
) = DECL_INITIAL (olddecl
);
2471 DECL_STRUCT_FUNCTION (newdecl
) = DECL_STRUCT_FUNCTION (olddecl
);
2472 DECL_SAVED_TREE (newdecl
) = DECL_SAVED_TREE (olddecl
);
2473 DECL_ARGUMENTS (newdecl
) = copy_list (DECL_ARGUMENTS (olddecl
));
2474 for (t
= DECL_ARGUMENTS (newdecl
); t
; t
= DECL_CHAIN (t
))
2475 DECL_CONTEXT (t
) = newdecl
;
2477 /* See if we've got a function to instantiate from. */
2478 if (DECL_SAVED_TREE (olddecl
))
2479 DECL_ABSTRACT_ORIGIN (newdecl
)
2480 = DECL_ABSTRACT_ORIGIN (olddecl
);
2484 /* Merge the USED information. */
2485 if (TREE_USED (olddecl
))
2486 TREE_USED (newdecl
) = 1;
2487 else if (TREE_USED (newdecl
))
2488 TREE_USED (olddecl
) = 1;
2489 if (TREE_CODE (olddecl
) == VAR_DECL
|| TREE_CODE (olddecl
) == PARM_DECL
)
2490 DECL_READ_P (newdecl
) |= DECL_READ_P (olddecl
);
2491 if (DECL_PRESERVE_P (olddecl
))
2492 DECL_PRESERVE_P (newdecl
) = 1;
2493 else if (DECL_PRESERVE_P (newdecl
))
2494 DECL_PRESERVE_P (olddecl
) = 1;
2496 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
2497 But preserve OLDDECL's DECL_UID, DECL_CONTEXT and
2498 DECL_ARGUMENTS (if appropriate). */
2500 unsigned olddecl_uid
= DECL_UID (olddecl
);
2501 tree olddecl_context
= DECL_CONTEXT (olddecl
);
2502 tree olddecl_arguments
= NULL
;
2503 if (TREE_CODE (olddecl
) == FUNCTION_DECL
)
2504 olddecl_arguments
= DECL_ARGUMENTS (olddecl
);
2506 memcpy ((char *) olddecl
+ sizeof (struct tree_common
),
2507 (char *) newdecl
+ sizeof (struct tree_common
),
2508 sizeof (struct tree_decl_common
) - sizeof (struct tree_common
));
2509 DECL_USER_ALIGN (olddecl
) = DECL_USER_ALIGN (newdecl
);
2510 switch (TREE_CODE (olddecl
))
2515 struct symtab_node
*snode
= olddecl
->decl_with_vis
.symtab_node
;
2517 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
2518 (char *) newdecl
+ sizeof (struct tree_decl_common
),
2519 tree_code_size (TREE_CODE (olddecl
)) - sizeof (struct tree_decl_common
));
2520 olddecl
->decl_with_vis
.symtab_node
= snode
;
2530 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
2531 (char *) newdecl
+ sizeof (struct tree_decl_common
),
2532 tree_code_size (TREE_CODE (olddecl
)) - sizeof (struct tree_decl_common
));
2537 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
2538 (char *) newdecl
+ sizeof (struct tree_decl_common
),
2539 sizeof (struct tree_decl_non_common
) - sizeof (struct tree_decl_common
));
2541 DECL_UID (olddecl
) = olddecl_uid
;
2542 DECL_CONTEXT (olddecl
) = olddecl_context
;
2543 if (TREE_CODE (olddecl
) == FUNCTION_DECL
)
2544 DECL_ARGUMENTS (olddecl
) = olddecl_arguments
;
2547 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2548 so that encode_section_info has a chance to look at the new decl
2549 flags and attributes. */
2550 if (DECL_RTL_SET_P (olddecl
)
2551 && (TREE_CODE (olddecl
) == FUNCTION_DECL
2552 || (TREE_CODE (olddecl
) == VAR_DECL
2553 && TREE_STATIC (olddecl
))))
2554 make_decl_rtl (olddecl
);
2557 /* Handle when a new declaration NEWDECL has the same name as an old
2558 one OLDDECL in the same binding contour. Prints an error message
2561 If safely possible, alter OLDDECL to look like NEWDECL, and return
2562 true. Otherwise, return false. */
2565 duplicate_decls (tree newdecl
, tree olddecl
)
2567 tree newtype
= NULL
, oldtype
= NULL
;
2569 if (!diagnose_mismatched_decls (newdecl
, olddecl
, &newtype
, &oldtype
))
2571 /* Avoid `unused variable' and other warnings for OLDDECL. */
2572 TREE_NO_WARNING (olddecl
) = 1;
2576 merge_decls (newdecl
, olddecl
, newtype
, oldtype
);
2578 /* The NEWDECL will no longer be needed.
2580 Before releasing the node, be sure to remove function from symbol
2581 table that might have been inserted there to record comdat group.
2582 Be sure to however do not free DECL_STRUCT_FUNCTION because this
2583 structure is shared in between NEWDECL and OLDECL. */
2584 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2585 DECL_STRUCT_FUNCTION (newdecl
) = NULL
;
2586 if (TREE_CODE (newdecl
) == FUNCTION_DECL
2587 || TREE_CODE (newdecl
) == VAR_DECL
)
2589 struct symtab_node
*snode
= symtab_get_node (newdecl
);
2591 symtab_remove_node (snode
);
2598 /* Check whether decl-node NEW_DECL shadows an existing declaration. */
2600 warn_if_shadowing (tree new_decl
)
2602 struct c_binding
*b
;
2604 /* Shadow warnings wanted? */
2606 /* No shadow warnings for internally generated vars. */
2607 || DECL_IS_BUILTIN (new_decl
)
2608 /* No shadow warnings for vars made for inlining. */
2609 || DECL_FROM_INLINE (new_decl
))
2612 /* Is anything being shadowed? Invisible decls do not count. */
2613 for (b
= I_SYMBOL_BINDING (DECL_NAME (new_decl
)); b
; b
= b
->shadowed
)
2614 if (b
->decl
&& b
->decl
!= new_decl
&& !b
->invisible
2615 && (b
->decl
== error_mark_node
2616 || diagnostic_report_warnings_p (global_dc
,
2617 DECL_SOURCE_LOCATION (b
->decl
))))
2619 tree old_decl
= b
->decl
;
2620 bool warned
= false;
2622 if (old_decl
== error_mark_node
)
2624 warning (OPT_Wshadow
, "declaration of %q+D shadows previous "
2625 "non-variable", new_decl
);
2628 else if (TREE_CODE (old_decl
) == PARM_DECL
)
2629 warned
= warning (OPT_Wshadow
,
2630 "declaration of %q+D shadows a parameter",
2632 else if (DECL_FILE_SCOPE_P (old_decl
))
2634 /* Do not warn if a variable shadows a function, unless
2635 the variable is a function or a pointer-to-function. */
2636 if (TREE_CODE (old_decl
) == FUNCTION_DECL
2637 && TREE_CODE (new_decl
) != FUNCTION_DECL
2638 && !FUNCTION_POINTER_TYPE_P (TREE_TYPE (new_decl
)))
2641 warned
= warning_at (DECL_SOURCE_LOCATION (new_decl
), OPT_Wshadow
,
2642 "declaration of %qD shadows a global "
2646 else if (TREE_CODE (old_decl
) == FUNCTION_DECL
2647 && DECL_BUILT_IN (old_decl
))
2649 warning (OPT_Wshadow
, "declaration of %q+D shadows "
2650 "a built-in function", new_decl
);
2654 warned
= warning (OPT_Wshadow
, "declaration of %q+D shadows a "
2655 "previous local", new_decl
);
2658 inform (DECL_SOURCE_LOCATION (old_decl
),
2659 "shadowed declaration is here");
2665 /* Record a decl-node X as belonging to the current lexical scope.
2666 Check for errors (such as an incompatible declaration for the same
2667 name already seen in the same scope).
2669 Returns either X or an old decl for the same name.
2670 If an old decl is returned, it may have been smashed
2671 to agree with what X says. */
2676 tree name
= DECL_NAME (x
);
2677 struct c_scope
*scope
= current_scope
;
2678 struct c_binding
*b
;
2679 bool nested
= false;
2680 location_t locus
= DECL_SOURCE_LOCATION (x
);
2682 /* Must set DECL_CONTEXT for everything not at file scope or
2683 DECL_FILE_SCOPE_P won't work. Local externs don't count
2684 unless they have initializers (which generate code). */
2685 if (current_function_decl
2686 && ((TREE_CODE (x
) != FUNCTION_DECL
&& TREE_CODE (x
) != VAR_DECL
)
2687 || DECL_INITIAL (x
) || !DECL_EXTERNAL (x
)))
2688 DECL_CONTEXT (x
) = current_function_decl
;
2690 /* Anonymous decls are just inserted in the scope. */
2693 bind (name
, x
, scope
, /*invisible=*/false, /*nested=*/false,
2698 /* First, see if there is another declaration with the same name in
2699 the current scope. If there is, duplicate_decls may do all the
2700 work for us. If duplicate_decls returns false, that indicates
2701 two incompatible decls in the same scope; we are to silently
2702 replace the old one (duplicate_decls has issued all appropriate
2703 diagnostics). In particular, we should not consider possible
2704 duplicates in the external scope, or shadowing. */
2705 b
= I_SYMBOL_BINDING (name
);
2706 if (b
&& B_IN_SCOPE (b
, scope
))
2708 struct c_binding
*b_ext
, *b_use
;
2709 tree type
= TREE_TYPE (x
);
2710 tree visdecl
= b
->decl
;
2711 tree vistype
= TREE_TYPE (visdecl
);
2712 if (TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
2713 && COMPLETE_TYPE_P (TREE_TYPE (x
)))
2714 b
->inner_comp
= false;
2717 /* If this is an external linkage declaration, we should check
2718 for compatibility with the type in the external scope before
2719 setting the type at this scope based on the visible
2720 information only. */
2721 if (TREE_PUBLIC (x
) && TREE_PUBLIC (visdecl
))
2723 while (b_ext
&& !B_IN_EXTERNAL_SCOPE (b_ext
))
2724 b_ext
= b_ext
->shadowed
;
2729 TREE_TYPE (b_use
->decl
) = b_use
->u
.type
;
2732 if (duplicate_decls (x
, b_use
->decl
))
2736 /* Save the updated type in the external scope and
2737 restore the proper type for this scope. */
2739 if (comptypes (vistype
, type
))
2740 thistype
= composite_type (vistype
, type
);
2742 thistype
= TREE_TYPE (b_use
->decl
);
2743 b_use
->u
.type
= TREE_TYPE (b_use
->decl
);
2744 if (TREE_CODE (b_use
->decl
) == FUNCTION_DECL
2745 && DECL_BUILT_IN (b_use
->decl
))
2747 = build_type_attribute_variant (thistype
,
2750 TREE_TYPE (b_use
->decl
) = thistype
;
2755 goto skip_external_and_shadow_checks
;
2758 /* All declarations with external linkage, and all external
2759 references, go in the external scope, no matter what scope is
2760 current. However, the binding in that scope is ignored for
2761 purposes of normal name lookup. A separate binding structure is
2762 created in the requested scope; this governs the normal
2763 visibility of the symbol.
2765 The binding in the externals scope is used exclusively for
2766 detecting duplicate declarations of the same object, no matter
2767 what scope they are in; this is what we do here. (C99 6.2.7p2:
2768 All declarations that refer to the same object or function shall
2769 have compatible type; otherwise, the behavior is undefined.) */
2770 if (DECL_EXTERNAL (x
) || scope
== file_scope
)
2772 tree type
= TREE_TYPE (x
);
2775 bool type_saved
= false;
2776 if (b
&& !B_IN_EXTERNAL_SCOPE (b
)
2777 && (TREE_CODE (b
->decl
) == FUNCTION_DECL
2778 || TREE_CODE (b
->decl
) == VAR_DECL
)
2779 && DECL_FILE_SCOPE_P (b
->decl
))
2782 vistype
= TREE_TYPE (visdecl
);
2784 if (scope
!= file_scope
2785 && !DECL_IN_SYSTEM_HEADER (x
))
2786 warning (OPT_Wnested_externs
, "nested extern declaration of %qD", x
);
2788 while (b
&& !B_IN_EXTERNAL_SCOPE (b
))
2790 /* If this decl might be modified, save its type. This is
2791 done here rather than when the decl is first bound
2792 because the type may change after first binding, through
2793 being completed or through attributes being added. If we
2794 encounter multiple such decls, only the first should have
2795 its type saved; the others will already have had their
2796 proper types saved and the types will not have changed as
2797 their scopes will not have been re-entered. */
2798 if (DECL_P (b
->decl
) && DECL_FILE_SCOPE_P (b
->decl
) && !type_saved
)
2800 b
->u
.type
= TREE_TYPE (b
->decl
);
2803 if (B_IN_FILE_SCOPE (b
)
2804 && TREE_CODE (b
->decl
) == VAR_DECL
2805 && TREE_STATIC (b
->decl
)
2806 && TREE_CODE (TREE_TYPE (b
->decl
)) == ARRAY_TYPE
2807 && !TYPE_DOMAIN (TREE_TYPE (b
->decl
))
2808 && TREE_CODE (type
) == ARRAY_TYPE
2809 && TYPE_DOMAIN (type
)
2810 && TYPE_MAX_VALUE (TYPE_DOMAIN (type
))
2811 && !integer_zerop (TYPE_MAX_VALUE (TYPE_DOMAIN (type
))))
2813 /* Array type completed in inner scope, which should be
2814 diagnosed if the completion does not have size 1 and
2815 it does not get completed in the file scope. */
2816 b
->inner_comp
= true;
2821 /* If a matching external declaration has been found, set its
2822 type to the composite of all the types of that declaration.
2823 After the consistency checks, it will be reset to the
2824 composite of the visible types only. */
2825 if (b
&& (TREE_PUBLIC (x
) || same_translation_unit_p (x
, b
->decl
))
2827 TREE_TYPE (b
->decl
) = b
->u
.type
;
2829 /* The point of the same_translation_unit_p check here is,
2830 we want to detect a duplicate decl for a construct like
2831 foo() { extern bar(); } ... static bar(); but not if
2832 they are in different translation units. In any case,
2833 the static does not go in the externals scope. */
2835 && (TREE_PUBLIC (x
) || same_translation_unit_p (x
, b
->decl
))
2836 && duplicate_decls (x
, b
->decl
))
2841 if (comptypes (vistype
, type
))
2842 thistype
= composite_type (vistype
, type
);
2844 thistype
= TREE_TYPE (b
->decl
);
2848 b
->u
.type
= TREE_TYPE (b
->decl
);
2849 if (TREE_CODE (b
->decl
) == FUNCTION_DECL
&& DECL_BUILT_IN (b
->decl
))
2851 = build_type_attribute_variant (thistype
,
2852 TYPE_ATTRIBUTES (b
->u
.type
));
2853 TREE_TYPE (b
->decl
) = thistype
;
2854 bind (name
, b
->decl
, scope
, /*invisible=*/false, /*nested=*/true,
2858 else if (TREE_PUBLIC (x
))
2860 if (visdecl
&& !b
&& duplicate_decls (x
, visdecl
))
2862 /* An external declaration at block scope referring to a
2863 visible entity with internal linkage. The composite
2864 type will already be correct for this scope, so we
2865 just need to fall through to make the declaration in
2872 bind (name
, x
, external_scope
, /*invisible=*/true,
2873 /*nested=*/false, locus
);
2879 if (TREE_CODE (x
) != PARM_DECL
)
2880 warn_if_shadowing (x
);
2882 skip_external_and_shadow_checks
:
2883 if (TREE_CODE (x
) == TYPE_DECL
)
2885 /* So this is a typedef, set its underlying type. */
2886 set_underlying_type (x
);
2888 /* If X is a typedef defined in the current function, record it
2889 for the purpose of implementing the -Wunused-local-typedefs
2891 record_locally_defined_typedef (x
);
2894 bind (name
, x
, scope
, /*invisible=*/false, nested
, locus
);
2896 /* If x's type is incomplete because it's based on a
2897 structure or union which has not yet been fully declared,
2898 attach it to that structure or union type, so we can go
2899 back and complete the variable declaration later, if the
2900 structure or union gets fully declared.
2902 If the input is erroneous, we can have error_mark in the type
2903 slot (e.g. "f(void a, ...)") - that doesn't count as an
2905 if (TREE_TYPE (x
) != error_mark_node
2906 && !COMPLETE_TYPE_P (TREE_TYPE (x
)))
2908 tree element
= TREE_TYPE (x
);
2910 while (TREE_CODE (element
) == ARRAY_TYPE
)
2911 element
= TREE_TYPE (element
);
2912 element
= TYPE_MAIN_VARIANT (element
);
2914 if ((TREE_CODE (element
) == RECORD_TYPE
2915 || TREE_CODE (element
) == UNION_TYPE
)
2916 && (TREE_CODE (x
) != TYPE_DECL
2917 || TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
)
2918 && !COMPLETE_TYPE_P (element
))
2919 C_TYPE_INCOMPLETE_VARS (element
)
2920 = tree_cons (NULL_TREE
, x
, C_TYPE_INCOMPLETE_VARS (element
));
2925 /* Record X as belonging to file scope.
2926 This is used only internally by the Objective-C front end,
2927 and is limited to its needs. duplicate_decls is not called;
2928 if there is any preexisting decl for this identifier, it is an ICE. */
2931 pushdecl_top_level (tree x
)
2934 bool nested
= false;
2935 gcc_assert (TREE_CODE (x
) == VAR_DECL
|| TREE_CODE (x
) == CONST_DECL
);
2937 name
= DECL_NAME (x
);
2939 gcc_assert (TREE_CODE (x
) == CONST_DECL
|| !I_SYMBOL_BINDING (name
));
2941 if (TREE_PUBLIC (x
))
2943 bind (name
, x
, external_scope
, /*invisible=*/true, /*nested=*/false,
2948 bind (name
, x
, file_scope
, /*invisible=*/false, nested
, UNKNOWN_LOCATION
);
2954 implicit_decl_warning (tree id
, tree olddecl
)
2956 if (warn_implicit_function_declaration
)
2961 warned
= pedwarn (input_location
, OPT_Wimplicit_function_declaration
,
2962 "implicit declaration of function %qE", id
);
2964 warned
= warning (OPT_Wimplicit_function_declaration
,
2965 G_("implicit declaration of function %qE"), id
);
2966 if (olddecl
&& warned
)
2967 locate_old_decl (olddecl
);
2971 /* Generate an implicit declaration for identifier FUNCTIONID at LOC as a
2972 function of type int (). */
2975 implicitly_declare (location_t loc
, tree functionid
)
2977 struct c_binding
*b
;
2981 for (b
= I_SYMBOL_BINDING (functionid
); b
; b
= b
->shadowed
)
2983 if (B_IN_SCOPE (b
, external_scope
))
2992 if (decl
== error_mark_node
)
2995 /* FIXME: Objective-C has weird not-really-builtin functions
2996 which are supposed to be visible automatically. They wind up
2997 in the external scope because they're pushed before the file
2998 scope gets created. Catch this here and rebind them into the
3000 if (!DECL_BUILT_IN (decl
) && DECL_IS_BUILTIN (decl
))
3002 bind (functionid
, decl
, file_scope
,
3003 /*invisible=*/false, /*nested=*/true,
3004 DECL_SOURCE_LOCATION (decl
));
3009 tree newtype
= default_function_type
;
3011 TREE_TYPE (decl
) = b
->u
.type
;
3012 /* Implicit declaration of a function already declared
3013 (somehow) in a different scope, or as a built-in.
3014 If this is the first time this has happened, warn;
3015 then recycle the old declaration but with the new type. */
3016 if (!C_DECL_IMPLICIT (decl
))
3018 implicit_decl_warning (functionid
, decl
);
3019 C_DECL_IMPLICIT (decl
) = 1;
3021 if (DECL_BUILT_IN (decl
))
3023 newtype
= build_type_attribute_variant (newtype
,
3025 (TREE_TYPE (decl
)));
3026 if (!comptypes (newtype
, TREE_TYPE (decl
)))
3028 warning_at (loc
, 0, "incompatible implicit declaration of "
3029 "built-in function %qD", decl
);
3030 newtype
= TREE_TYPE (decl
);
3035 if (!comptypes (newtype
, TREE_TYPE (decl
)))
3037 error_at (loc
, "incompatible implicit declaration of function %qD", decl
);
3038 locate_old_decl (decl
);
3041 b
->u
.type
= TREE_TYPE (decl
);
3042 TREE_TYPE (decl
) = newtype
;
3043 bind (functionid
, decl
, current_scope
,
3044 /*invisible=*/false, /*nested=*/true,
3045 DECL_SOURCE_LOCATION (decl
));
3050 /* Not seen before. */
3051 decl
= build_decl (loc
, FUNCTION_DECL
, functionid
, default_function_type
);
3052 DECL_EXTERNAL (decl
) = 1;
3053 TREE_PUBLIC (decl
) = 1;
3054 C_DECL_IMPLICIT (decl
) = 1;
3055 implicit_decl_warning (functionid
, 0);
3056 asmspec_tree
= maybe_apply_renaming_pragma (decl
, /*asmname=*/NULL
);
3058 set_user_assembler_name (decl
, TREE_STRING_POINTER (asmspec_tree
));
3060 /* C89 says implicit declarations are in the innermost block.
3061 So we record the decl in the standard fashion. */
3062 decl
= pushdecl (decl
);
3064 /* No need to call objc_check_decl here - it's a function type. */
3065 rest_of_decl_compilation (decl
, 0, 0);
3067 /* Write a record describing this implicit function declaration
3068 to the prototypes file (if requested). */
3069 gen_aux_info_record (decl
, 0, 1, 0);
3071 /* Possibly apply some default attributes to this implicit declaration. */
3072 decl_attributes (&decl
, NULL_TREE
, 0);
3077 /* Issue an error message for a reference to an undeclared variable
3078 ID, including a reference to a builtin outside of function-call
3079 context. Establish a binding of the identifier to error_mark_node
3080 in an appropriate scope, which will suppress further errors for the
3081 same identifier. The error message should be given location LOC. */
3083 undeclared_variable (location_t loc
, tree id
)
3085 static bool already
= false;
3086 struct c_scope
*scope
;
3088 if (current_function_decl
== 0)
3090 error_at (loc
, "%qE undeclared here (not in a function)", id
);
3091 scope
= current_scope
;
3095 if (!objc_diagnose_private_ivar (id
))
3096 error_at (loc
, "%qE undeclared (first use in this function)", id
);
3099 inform (loc
, "each undeclared identifier is reported only"
3100 " once for each function it appears in");
3104 /* If we are parsing old-style parameter decls, current_function_decl
3105 will be nonnull but current_function_scope will be null. */
3106 scope
= current_function_scope
? current_function_scope
: current_scope
;
3108 bind (id
, error_mark_node
, scope
, /*invisible=*/false, /*nested=*/false,
3112 /* Subroutine of lookup_label, declare_label, define_label: construct a
3113 LABEL_DECL with all the proper frills. Also create a struct
3114 c_label_vars initialized for the current scope. */
3117 make_label (location_t location
, tree name
, bool defining
,
3118 struct c_label_vars
**p_label_vars
)
3120 tree label
= build_decl (location
, LABEL_DECL
, name
, void_type_node
);
3121 DECL_CONTEXT (label
) = current_function_decl
;
3122 DECL_MODE (label
) = VOIDmode
;
3124 c_label_vars
*label_vars
= ggc_alloc
<c_label_vars
> ();
3125 label_vars
->shadowed
= NULL
;
3126 set_spot_bindings (&label_vars
->label_bindings
, defining
);
3127 label_vars
->decls_in_scope
= make_tree_vector ();
3128 label_vars
->gotos
= NULL
;
3129 *p_label_vars
= label_vars
;
3134 /* Get the LABEL_DECL corresponding to identifier NAME as a label.
3135 Create one if none exists so far for the current function.
3136 This is called when a label is used in a goto expression or
3137 has its address taken. */
3140 lookup_label (tree name
)
3143 struct c_label_vars
*label_vars
;
3145 if (current_function_scope
== 0)
3147 error ("label %qE referenced outside of any function", name
);
3151 /* Use a label already defined or ref'd with this name, but not if
3152 it is inherited from a containing function and wasn't declared
3154 label
= I_LABEL_DECL (name
);
3155 if (label
&& (DECL_CONTEXT (label
) == current_function_decl
3156 || C_DECLARED_LABEL_FLAG (label
)))
3158 /* If the label has only been declared, update its apparent
3159 location to point here, for better diagnostics if it
3160 turns out not to have been defined. */
3161 if (DECL_INITIAL (label
) == NULL_TREE
)
3162 DECL_SOURCE_LOCATION (label
) = input_location
;
3166 /* No label binding for that identifier; make one. */
3167 label
= make_label (input_location
, name
, false, &label_vars
);
3169 /* Ordinary labels go in the current function scope. */
3170 bind_label (name
, label
, current_function_scope
, label_vars
);
3175 /* Issue a warning about DECL for a goto statement at GOTO_LOC going
3179 warn_about_goto (location_t goto_loc
, tree label
, tree decl
)
3181 if (variably_modified_type_p (TREE_TYPE (decl
), NULL_TREE
))
3183 "jump into scope of identifier with variably modified type");
3185 warning_at (goto_loc
, OPT_Wjump_misses_init
,
3186 "jump skips variable initialization");
3187 inform (DECL_SOURCE_LOCATION (label
), "label %qD defined here", label
);
3188 inform (DECL_SOURCE_LOCATION (decl
), "%qD declared here", decl
);
3191 /* Look up a label because of a goto statement. This is like
3192 lookup_label, but also issues any appropriate warnings. */
3195 lookup_label_for_goto (location_t loc
, tree name
)
3198 struct c_label_vars
*label_vars
;
3202 label
= lookup_label (name
);
3203 if (label
== NULL_TREE
)
3206 /* If we are jumping to a different function, we can't issue any
3208 if (DECL_CONTEXT (label
) != current_function_decl
)
3210 gcc_assert (C_DECLARED_LABEL_FLAG (label
));
3214 label_vars
= I_LABEL_BINDING (name
)->u
.label
;
3216 /* If the label has not yet been defined, then push this goto on a
3217 list for possible later warnings. */
3218 if (label_vars
->label_bindings
.scope
== NULL
)
3220 c_goto_bindings
*g
= ggc_alloc
<c_goto_bindings
> ();
3223 set_spot_bindings (&g
->goto_bindings
, true);
3224 vec_safe_push (label_vars
->gotos
, g
);
3228 /* If there are any decls in label_vars->decls_in_scope, then this
3229 goto has missed the declaration of the decl. This happens for a
3235 Issue a warning or error. */
3236 FOR_EACH_VEC_SAFE_ELT (label_vars
->decls_in_scope
, ix
, decl
)
3237 warn_about_goto (loc
, label
, decl
);
3239 if (label_vars
->label_bindings
.left_stmt_expr
)
3241 error_at (loc
, "jump into statement expression");
3242 inform (DECL_SOURCE_LOCATION (label
), "label %qD defined here", label
);
3248 /* Make a label named NAME in the current function, shadowing silently
3249 any that may be inherited from containing functions or containing
3250 scopes. This is called for __label__ declarations. */
3253 declare_label (tree name
)
3255 struct c_binding
*b
= I_LABEL_BINDING (name
);
3257 struct c_label_vars
*label_vars
;
3259 /* Check to make sure that the label hasn't already been declared
3261 if (b
&& B_IN_CURRENT_SCOPE (b
))
3263 error ("duplicate label declaration %qE", name
);
3264 locate_old_decl (b
->decl
);
3266 /* Just use the previous declaration. */
3270 label
= make_label (input_location
, name
, false, &label_vars
);
3271 C_DECLARED_LABEL_FLAG (label
) = 1;
3273 /* Declared labels go in the current scope. */
3274 bind_label (name
, label
, current_scope
, label_vars
);
3279 /* When we define a label, issue any appropriate warnings if there are
3280 any gotos earlier in the function which jump to this label. */
3283 check_earlier_gotos (tree label
, struct c_label_vars
* label_vars
)
3286 struct c_goto_bindings
*g
;
3288 FOR_EACH_VEC_SAFE_ELT (label_vars
->gotos
, ix
, g
)
3290 struct c_binding
*b
;
3291 struct c_scope
*scope
;
3293 /* We have a goto to this label. The goto is going forward. In
3294 g->scope, the goto is going to skip any binding which was
3295 defined after g->bindings_in_scope. */
3296 if (g
->goto_bindings
.scope
->has_jump_unsafe_decl
)
3298 for (b
= g
->goto_bindings
.scope
->bindings
;
3299 b
!= g
->goto_bindings
.bindings_in_scope
;
3302 if (decl_jump_unsafe (b
->decl
))
3303 warn_about_goto (g
->loc
, label
, b
->decl
);
3307 /* We also need to warn about decls defined in any scopes
3308 between the scope of the label and the scope of the goto. */
3309 for (scope
= label_vars
->label_bindings
.scope
;
3310 scope
!= g
->goto_bindings
.scope
;
3311 scope
= scope
->outer
)
3313 gcc_assert (scope
!= NULL
);
3314 if (scope
->has_jump_unsafe_decl
)
3316 if (scope
== label_vars
->label_bindings
.scope
)
3317 b
= label_vars
->label_bindings
.bindings_in_scope
;
3319 b
= scope
->bindings
;
3320 for (; b
!= NULL
; b
= b
->prev
)
3322 if (decl_jump_unsafe (b
->decl
))
3323 warn_about_goto (g
->loc
, label
, b
->decl
);
3328 if (g
->goto_bindings
.stmt_exprs
> 0)
3330 error_at (g
->loc
, "jump into statement expression");
3331 inform (DECL_SOURCE_LOCATION (label
), "label %qD defined here",
3336 /* Now that the label is defined, we will issue warnings about
3337 subsequent gotos to this label when we see them. */
3338 vec_safe_truncate (label_vars
->gotos
, 0);
3339 label_vars
->gotos
= NULL
;
3342 /* Define a label, specifying the location in the source file.
3343 Return the LABEL_DECL node for the label, if the definition is valid.
3344 Otherwise return 0. */
3347 define_label (location_t location
, tree name
)
3349 /* Find any preexisting label with this name. It is an error
3350 if that label has already been defined in this function, or
3351 if there is a containing function with a declared label with
3353 tree label
= I_LABEL_DECL (name
);
3356 && ((DECL_CONTEXT (label
) == current_function_decl
3357 && DECL_INITIAL (label
) != 0)
3358 || (DECL_CONTEXT (label
) != current_function_decl
3359 && C_DECLARED_LABEL_FLAG (label
))))
3361 error_at (location
, "duplicate label %qD", label
);
3362 locate_old_decl (label
);
3365 else if (label
&& DECL_CONTEXT (label
) == current_function_decl
)
3367 struct c_label_vars
*label_vars
= I_LABEL_BINDING (name
)->u
.label
;
3369 /* The label has been used or declared already in this function,
3370 but not defined. Update its location to point to this
3372 DECL_SOURCE_LOCATION (label
) = location
;
3373 set_spot_bindings (&label_vars
->label_bindings
, true);
3375 /* Issue warnings as required about any goto statements from
3376 earlier in the function. */
3377 check_earlier_gotos (label
, label_vars
);
3381 struct c_label_vars
*label_vars
;
3383 /* No label binding for that identifier; make one. */
3384 label
= make_label (location
, name
, true, &label_vars
);
3386 /* Ordinary labels go in the current function scope. */
3387 bind_label (name
, label
, current_function_scope
, label_vars
);
3390 if (!in_system_header_at (input_location
) && lookup_name (name
))
3391 warning_at (location
, OPT_Wtraditional
,
3392 "traditional C lacks a separate namespace "
3393 "for labels, identifier %qE conflicts", name
);
3395 /* Mark label as having been defined. */
3396 DECL_INITIAL (label
) = error_mark_node
;
3400 /* Get the bindings for a new switch statement. This is used to issue
3401 warnings as appropriate for jumps from the switch to case or
3404 struct c_spot_bindings
*
3405 c_get_switch_bindings (void)
3407 struct c_spot_bindings
*switch_bindings
;
3409 switch_bindings
= XNEW (struct c_spot_bindings
);
3410 set_spot_bindings (switch_bindings
, true);
3411 return switch_bindings
;
3415 c_release_switch_bindings (struct c_spot_bindings
*bindings
)
3417 gcc_assert (bindings
->stmt_exprs
== 0 && !bindings
->left_stmt_expr
);
3421 /* This is called at the point of a case or default label to issue
3422 warnings about decls as needed. It returns true if it found an
3423 error, not just a warning. */
3426 c_check_switch_jump_warnings (struct c_spot_bindings
*switch_bindings
,
3427 location_t switch_loc
, location_t case_loc
)
3430 struct c_scope
*scope
;
3433 for (scope
= current_scope
;
3434 scope
!= switch_bindings
->scope
;
3435 scope
= scope
->outer
)
3437 struct c_binding
*b
;
3439 gcc_assert (scope
!= NULL
);
3441 if (!scope
->has_jump_unsafe_decl
)
3444 for (b
= scope
->bindings
; b
!= NULL
; b
= b
->prev
)
3446 if (decl_jump_unsafe (b
->decl
))
3448 if (variably_modified_type_p (TREE_TYPE (b
->decl
), NULL_TREE
))
3452 ("switch jumps into scope of identifier with "
3453 "variably modified type"));
3456 warning_at (case_loc
, OPT_Wjump_misses_init
,
3457 "switch jumps over variable initialization");
3458 inform (switch_loc
, "switch starts here");
3459 inform (DECL_SOURCE_LOCATION (b
->decl
), "%qD declared here",
3465 if (switch_bindings
->stmt_exprs
> 0)
3468 error_at (case_loc
, "switch jumps into statement expression");
3469 inform (switch_loc
, "switch starts here");
3475 /* Given NAME, an IDENTIFIER_NODE,
3476 return the structure (or union or enum) definition for that name.
3477 If THISLEVEL_ONLY is nonzero, searches only the current_scope.
3478 CODE says which kind of type the caller wants;
3479 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
3480 If PLOC is not NULL and this returns non-null, it sets *PLOC to the
3481 location where the tag was defined.
3482 If the wrong kind of type is found, an error is reported. */
3485 lookup_tag (enum tree_code code
, tree name
, int thislevel_only
,
3488 struct c_binding
*b
= I_TAG_BINDING (name
);
3494 /* We only care about whether it's in this level if
3495 thislevel_only was set or it might be a type clash. */
3496 if (thislevel_only
|| TREE_CODE (b
->decl
) != code
)
3498 /* For our purposes, a tag in the external scope is the same as
3499 a tag in the file scope. (Primarily relevant to Objective-C
3500 and its builtin structure tags, which get pushed before the
3501 file scope is created.) */
3502 if (B_IN_CURRENT_SCOPE (b
)
3503 || (current_scope
== file_scope
&& B_IN_EXTERNAL_SCOPE (b
)))
3507 if (thislevel_only
&& !thislevel
)
3510 if (TREE_CODE (b
->decl
) != code
)
3512 /* Definition isn't the kind we were looking for. */
3513 pending_invalid_xref
= name
;
3514 pending_invalid_xref_location
= input_location
;
3516 /* If in the same binding level as a declaration as a tag
3517 of a different type, this must not be allowed to
3518 shadow that tag, so give the error immediately.
3519 (For example, "struct foo; union foo;" is invalid.) */
3521 pending_xref_error ();
3530 /* Print an error message now
3531 for a recent invalid struct, union or enum cross reference.
3532 We don't print them immediately because they are not invalid
3533 when used in the `struct foo;' construct for shadowing. */
3536 pending_xref_error (void)
3538 if (pending_invalid_xref
!= 0)
3539 error_at (pending_invalid_xref_location
, "%qE defined as wrong kind of tag",
3540 pending_invalid_xref
);
3541 pending_invalid_xref
= 0;
3545 /* Look up NAME in the current scope and its superiors
3546 in the namespace of variables, functions and typedefs.
3547 Return a ..._DECL node of some kind representing its definition,
3548 or return 0 if it is undefined. */
3551 lookup_name (tree name
)
3553 struct c_binding
*b
= I_SYMBOL_BINDING (name
);
3554 if (b
&& !b
->invisible
)
3556 maybe_record_typedef_use (b
->decl
);
3562 /* Similar to `lookup_name' but look only at the indicated scope. */
3565 lookup_name_in_scope (tree name
, struct c_scope
*scope
)
3567 struct c_binding
*b
;
3569 for (b
= I_SYMBOL_BINDING (name
); b
; b
= b
->shadowed
)
3570 if (B_IN_SCOPE (b
, scope
))
3575 /* Create the predefined scalar types of C,
3576 and some nodes representing standard constants (0, 1, (void *) 0).
3577 Initialize the global scope.
3578 Make definitions for built-in primitive functions. */
3581 c_init_decl_processing (void)
3583 location_t save_loc
= input_location
;
3585 /* Initialize reserved words for parser. */
3588 current_function_decl
= 0;
3590 gcc_obstack_init (&parser_obstack
);
3592 /* Make the externals scope. */
3594 external_scope
= current_scope
;
3596 /* Declarations from c_common_nodes_and_builtins must not be associated
3597 with this input file, lest we get differences between using and not
3598 using preprocessed headers. */
3599 input_location
= BUILTINS_LOCATION
;
3601 c_common_nodes_and_builtins ();
3603 /* In C, comparisons and TRUTH_* expressions have type int. */
3604 truthvalue_type_node
= integer_type_node
;
3605 truthvalue_true_node
= integer_one_node
;
3606 truthvalue_false_node
= integer_zero_node
;
3608 /* Even in C99, which has a real boolean type. */
3609 pushdecl (build_decl (UNKNOWN_LOCATION
, TYPE_DECL
, get_identifier ("_Bool"),
3610 boolean_type_node
));
3612 input_location
= save_loc
;
3614 pedantic_lvalues
= true;
3616 make_fname_decl
= c_make_fname_decl
;
3617 start_fname_decls ();
3620 /* Create the VAR_DECL at LOC for __FUNCTION__ etc. ID is the name to
3621 give the decl, NAME is the initialization string and TYPE_DEP
3622 indicates whether NAME depended on the type of the function. As we
3623 don't yet implement delayed emission of static data, we mark the
3624 decl as emitted so it is not placed in the output. Anything using
3625 it must therefore pull out the STRING_CST initializer directly.
3629 c_make_fname_decl (location_t loc
, tree id
, int type_dep
)
3631 const char *name
= fname_as_string (type_dep
);
3632 tree decl
, type
, init
;
3633 size_t length
= strlen (name
);
3635 type
= build_array_type (char_type_node
,
3636 build_index_type (size_int (length
)));
3637 type
= c_build_qualified_type (type
, TYPE_QUAL_CONST
);
3639 decl
= build_decl (loc
, VAR_DECL
, id
, type
);
3641 TREE_STATIC (decl
) = 1;
3642 TREE_READONLY (decl
) = 1;
3643 DECL_ARTIFICIAL (decl
) = 1;
3645 init
= build_string (length
+ 1, name
);
3646 free (CONST_CAST (char *, name
));
3647 TREE_TYPE (init
) = type
;
3648 DECL_INITIAL (decl
) = init
;
3650 TREE_USED (decl
) = 1;
3652 if (current_function_decl
3653 /* For invalid programs like this:
3656 const char* p = __FUNCTION__;
3658 the __FUNCTION__ is believed to appear in K&R style function
3659 parameter declarator. In that case we still don't have
3661 && (!seen_error () || current_function_scope
))
3663 DECL_CONTEXT (decl
) = current_function_decl
;
3664 bind (id
, decl
, current_function_scope
,
3665 /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION
);
3668 finish_decl (decl
, loc
, init
, NULL_TREE
, NULL_TREE
);
3674 c_builtin_function (tree decl
)
3676 tree type
= TREE_TYPE (decl
);
3677 tree id
= DECL_NAME (decl
);
3679 const char *name
= IDENTIFIER_POINTER (id
);
3680 C_DECL_BUILTIN_PROTOTYPE (decl
) = prototype_p (type
);
3682 /* Should never be called on a symbol with a preexisting meaning. */
3683 gcc_assert (!I_SYMBOL_BINDING (id
));
3685 bind (id
, decl
, external_scope
, /*invisible=*/true, /*nested=*/false,
3688 /* Builtins in the implementation namespace are made visible without
3689 needing to be explicitly declared. See push_file_scope. */
3690 if (name
[0] == '_' && (name
[1] == '_' || ISUPPER (name
[1])))
3692 DECL_CHAIN (decl
) = visible_builtins
;
3693 visible_builtins
= decl
;
3700 c_builtin_function_ext_scope (tree decl
)
3702 tree type
= TREE_TYPE (decl
);
3703 tree id
= DECL_NAME (decl
);
3705 const char *name
= IDENTIFIER_POINTER (id
);
3706 C_DECL_BUILTIN_PROTOTYPE (decl
) = prototype_p (type
);
3709 bind (id
, decl
, external_scope
, /*invisible=*/false, /*nested=*/false,
3712 /* Builtins in the implementation namespace are made visible without
3713 needing to be explicitly declared. See push_file_scope. */
3714 if (name
[0] == '_' && (name
[1] == '_' || ISUPPER (name
[1])))
3716 DECL_CHAIN (decl
) = visible_builtins
;
3717 visible_builtins
= decl
;
3723 /* Called when a declaration is seen that contains no names to declare.
3724 If its type is a reference to a structure, union or enum inherited
3725 from a containing scope, shadow that tag name for the current scope
3726 with a forward reference.
3727 If its type defines a new named structure or union
3728 or defines an enum, it is valid but we need not do anything here.
3729 Otherwise, it is an error. */
3732 shadow_tag (const struct c_declspecs
*declspecs
)
3734 shadow_tag_warned (declspecs
, 0);
3737 /* WARNED is 1 if we have done a pedwarn, 2 if we have done a warning,
3740 shadow_tag_warned (const struct c_declspecs
*declspecs
, int warned
)
3742 bool found_tag
= false;
3744 if (declspecs
->type
&& !declspecs
->default_int_p
&& !declspecs
->typedef_p
)
3746 tree value
= declspecs
->type
;
3747 enum tree_code code
= TREE_CODE (value
);
3749 if (code
== RECORD_TYPE
|| code
== UNION_TYPE
|| code
== ENUMERAL_TYPE
)
3750 /* Used to test also that TYPE_SIZE (value) != 0.
3751 That caused warning for `struct foo;' at top level in the file. */
3753 tree name
= TYPE_NAME (value
);
3758 if (declspecs
->restrict_p
)
3760 error ("invalid use of %<restrict%>");
3766 if (warned
!= 1 && code
!= ENUMERAL_TYPE
)
3767 /* Empty unnamed enum OK */
3769 pedwarn (input_location
, 0,
3770 "unnamed struct/union that defines no instances");
3774 else if (declspecs
->typespec_kind
!= ctsk_tagdef
3775 && declspecs
->typespec_kind
!= ctsk_tagfirstref
3776 && declspecs
->storage_class
!= csc_none
)
3779 pedwarn (input_location
, 0,
3780 "empty declaration with storage class specifier "
3781 "does not redeclare tag");
3783 pending_xref_error ();
3785 else if (declspecs
->typespec_kind
!= ctsk_tagdef
3786 && declspecs
->typespec_kind
!= ctsk_tagfirstref
3787 && (declspecs
->const_p
3788 || declspecs
->volatile_p
3789 || declspecs
->atomic_p
3790 || declspecs
->restrict_p
3791 || declspecs
->address_space
))
3794 pedwarn (input_location
, 0,
3795 "empty declaration with type qualifier "
3796 "does not redeclare tag");
3798 pending_xref_error ();
3800 else if (declspecs
->typespec_kind
!= ctsk_tagdef
3801 && declspecs
->typespec_kind
!= ctsk_tagfirstref
3802 && declspecs
->alignas_p
)
3805 pedwarn (input_location
, 0,
3806 "empty declaration with %<_Alignas%> "
3807 "does not redeclare tag");
3809 pending_xref_error ();
3813 pending_invalid_xref
= 0;
3814 t
= lookup_tag (code
, name
, 1, NULL
);
3818 t
= make_node (code
);
3819 pushtag (input_location
, name
, t
);
3825 if (warned
!= 1 && !in_system_header_at (input_location
))
3827 pedwarn (input_location
, 0,
3828 "useless type name in empty declaration");
3833 else if (warned
!= 1 && !in_system_header_at (input_location
)
3834 && declspecs
->typedef_p
)
3836 pedwarn (input_location
, 0, "useless type name in empty declaration");
3840 pending_invalid_xref
= 0;
3842 if (declspecs
->inline_p
)
3844 error ("%<inline%> in empty declaration");
3848 if (declspecs
->noreturn_p
)
3850 error ("%<_Noreturn%> in empty declaration");
3854 if (current_scope
== file_scope
&& declspecs
->storage_class
== csc_auto
)
3856 error ("%<auto%> in file-scope empty declaration");
3860 if (current_scope
== file_scope
&& declspecs
->storage_class
== csc_register
)
3862 error ("%<register%> in file-scope empty declaration");
3866 if (!warned
&& !in_system_header_at (input_location
)
3867 && declspecs
->storage_class
!= csc_none
)
3869 warning (0, "useless storage class specifier in empty declaration");
3873 if (!warned
&& !in_system_header_at (input_location
) && declspecs
->thread_p
)
3875 warning (0, "useless %qs in empty declaration",
3876 declspecs
->thread_gnu_p
? "__thread" : "_Thread_local");
3881 && !in_system_header_at (input_location
)
3882 && (declspecs
->const_p
3883 || declspecs
->volatile_p
3884 || declspecs
->atomic_p
3885 || declspecs
->restrict_p
3886 || declspecs
->address_space
))
3888 warning (0, "useless type qualifier in empty declaration");
3892 if (!warned
&& !in_system_header_at (input_location
)
3893 && declspecs
->alignas_p
)
3895 warning (0, "useless %<_Alignas%> in empty declaration");
3902 pedwarn (input_location
, 0, "empty declaration");
3907 /* Return the qualifiers from SPECS as a bitwise OR of TYPE_QUAL_*
3908 bits. SPECS represents declaration specifiers that the grammar
3909 only permits to contain type qualifiers and attributes. */
3912 quals_from_declspecs (const struct c_declspecs
*specs
)
3914 int quals
= ((specs
->const_p
? TYPE_QUAL_CONST
: 0)
3915 | (specs
->volatile_p
? TYPE_QUAL_VOLATILE
: 0)
3916 | (specs
->restrict_p
? TYPE_QUAL_RESTRICT
: 0)
3917 | (specs
->atomic_p
? TYPE_QUAL_ATOMIC
: 0)
3918 | (ENCODE_QUAL_ADDR_SPACE (specs
->address_space
)));
3919 gcc_assert (!specs
->type
3920 && !specs
->decl_attr
3921 && specs
->typespec_word
== cts_none
3922 && specs
->storage_class
== csc_none
3923 && !specs
->typedef_p
3924 && !specs
->explicit_signed_p
3925 && !specs
->deprecated_p
3927 && !specs
->long_long_p
3930 && !specs
->unsigned_p
3931 && !specs
->complex_p
3933 && !specs
->noreturn_p
3934 && !specs
->thread_p
);
3938 /* Construct an array declarator. LOC is the location of the
3939 beginning of the array (usually the opening brace). EXPR is the
3940 expression inside [], or NULL_TREE. QUALS are the type qualifiers
3941 inside the [] (to be applied to the pointer to which a parameter
3942 array is converted). STATIC_P is true if "static" is inside the
3943 [], false otherwise. VLA_UNSPEC_P is true if the array is [*], a
3944 VLA of unspecified length which is nevertheless a complete type,
3945 false otherwise. The field for the contained declarator is left to
3946 be filled in by set_array_declarator_inner. */
3948 struct c_declarator
*
3949 build_array_declarator (location_t loc
,
3950 tree expr
, struct c_declspecs
*quals
, bool static_p
,
3953 struct c_declarator
*declarator
= XOBNEW (&parser_obstack
,
3954 struct c_declarator
);
3955 declarator
->id_loc
= loc
;
3956 declarator
->kind
= cdk_array
;
3957 declarator
->declarator
= 0;
3958 declarator
->u
.array
.dimen
= expr
;
3961 declarator
->u
.array
.attrs
= quals
->attrs
;
3962 declarator
->u
.array
.quals
= quals_from_declspecs (quals
);
3966 declarator
->u
.array
.attrs
= NULL_TREE
;
3967 declarator
->u
.array
.quals
= 0;
3969 declarator
->u
.array
.static_p
= static_p
;
3970 declarator
->u
.array
.vla_unspec_p
= vla_unspec_p
;
3973 if (static_p
|| quals
!= NULL
)
3974 pedwarn (loc
, OPT_Wpedantic
,
3975 "ISO C90 does not support %<static%> or type "
3976 "qualifiers in parameter array declarators");
3978 pedwarn (loc
, OPT_Wpedantic
,
3979 "ISO C90 does not support %<[*]%> array declarators");
3983 if (!current_scope
->parm_flag
)
3986 error_at (loc
, "%<[*]%> not allowed in other than "
3987 "function prototype scope");
3988 declarator
->u
.array
.vla_unspec_p
= false;
3991 current_scope
->had_vla_unspec
= true;
3996 /* Set the contained declarator of an array declarator. DECL is the
3997 declarator, as constructed by build_array_declarator; INNER is what
3998 appears on the left of the []. */
4000 struct c_declarator
*
4001 set_array_declarator_inner (struct c_declarator
*decl
,
4002 struct c_declarator
*inner
)
4004 decl
->declarator
= inner
;
4008 /* INIT is a constructor that forms DECL's initializer. If the final
4009 element initializes a flexible array field, add the size of that
4010 initializer to DECL's size. */
4013 add_flexible_array_elts_to_size (tree decl
, tree init
)
4017 if (vec_safe_is_empty (CONSTRUCTOR_ELTS (init
)))
4020 elt
= CONSTRUCTOR_ELTS (init
)->last ().value
;
4021 type
= TREE_TYPE (elt
);
4022 if (TREE_CODE (type
) == ARRAY_TYPE
4023 && TYPE_SIZE (type
) == NULL_TREE
4024 && TYPE_DOMAIN (type
) != NULL_TREE
4025 && TYPE_MAX_VALUE (TYPE_DOMAIN (type
)) == NULL_TREE
)
4027 complete_array_type (&type
, elt
, false);
4029 = size_binop (PLUS_EXPR
, DECL_SIZE (decl
), TYPE_SIZE (type
));
4030 DECL_SIZE_UNIT (decl
)
4031 = size_binop (PLUS_EXPR
, DECL_SIZE_UNIT (decl
), TYPE_SIZE_UNIT (type
));
4035 /* Decode a "typename", such as "int **", returning a ..._TYPE node.
4036 Set *EXPR, if EXPR not NULL, to any expression to be evaluated
4037 before the type name, and set *EXPR_CONST_OPERANDS, if
4038 EXPR_CONST_OPERANDS not NULL, to indicate whether the type name may
4039 appear in a constant expression. */
4042 groktypename (struct c_type_name
*type_name
, tree
*expr
,
4043 bool *expr_const_operands
)
4046 tree attrs
= type_name
->specs
->attrs
;
4048 type_name
->specs
->attrs
= NULL_TREE
;
4050 type
= grokdeclarator (type_name
->declarator
, type_name
->specs
, TYPENAME
,
4051 false, NULL
, &attrs
, expr
, expr_const_operands
,
4054 /* Apply attributes. */
4055 decl_attributes (&type
, attrs
, 0);
4060 /* Wrapper for decl_attributes that adds some implicit attributes
4061 to VAR_DECLs or FUNCTION_DECLs. */
4064 c_decl_attributes (tree
*node
, tree attributes
, int flags
)
4066 /* Add implicit "omp declare target" attribute if requested. */
4067 if (current_omp_declare_target_attribute
4068 && ((TREE_CODE (*node
) == VAR_DECL
&& TREE_STATIC (*node
))
4069 || TREE_CODE (*node
) == FUNCTION_DECL
))
4071 if (TREE_CODE (*node
) == VAR_DECL
4072 && ((DECL_CONTEXT (*node
)
4073 && TREE_CODE (DECL_CONTEXT (*node
)) == FUNCTION_DECL
)
4074 || (current_function_decl
&& !DECL_EXTERNAL (*node
))))
4075 error ("%q+D in block scope inside of declare target directive",
4077 else if (TREE_CODE (*node
) == VAR_DECL
4078 && !lang_hooks
.types
.omp_mappable_type (TREE_TYPE (*node
)))
4079 error ("%q+D in declare target directive does not have mappable type",
4082 attributes
= tree_cons (get_identifier ("omp declare target"),
4083 NULL_TREE
, attributes
);
4085 return decl_attributes (node
, attributes
, flags
);
4089 /* Decode a declarator in an ordinary declaration or data definition.
4090 This is called as soon as the type information and variable name
4091 have been parsed, before parsing the initializer if any.
4092 Here we create the ..._DECL node, fill in its type,
4093 and put it on the list of decls for the current context.
4094 The ..._DECL node is returned as the value.
4096 Exception: for arrays where the length is not specified,
4097 the type is left null, to be filled in by `finish_decl'.
4099 Function definitions do not come here; they go to start_function
4100 instead. However, external and forward declarations of functions
4101 do go through here. Structure field declarations are done by
4102 grokfield and not through here. */
4105 start_decl (struct c_declarator
*declarator
, struct c_declspecs
*declspecs
,
4106 bool initialized
, tree attributes
)
4110 tree expr
= NULL_TREE
;
4111 enum deprecated_states deprecated_state
= DEPRECATED_NORMAL
;
4113 /* An object declared as __attribute__((deprecated)) suppresses
4114 warnings of uses of other deprecated items. */
4115 if (lookup_attribute ("deprecated", attributes
))
4116 deprecated_state
= DEPRECATED_SUPPRESS
;
4118 decl
= grokdeclarator (declarator
, declspecs
,
4119 NORMAL
, initialized
, NULL
, &attributes
, &expr
, NULL
,
4125 add_stmt (fold_convert (void_type_node
, expr
));
4127 if (TREE_CODE (decl
) != FUNCTION_DECL
&& MAIN_NAME_P (DECL_NAME (decl
)))
4128 warning (OPT_Wmain
, "%q+D is usually a function", decl
);
4131 /* Is it valid for this decl to have an initializer at all?
4132 If not, set INITIALIZED to zero, which will indirectly
4133 tell 'finish_decl' to ignore the initializer once it is parsed. */
4134 switch (TREE_CODE (decl
))
4137 error ("typedef %qD is initialized (use __typeof__ instead)", decl
);
4142 error ("function %qD is initialized like a variable", decl
);
4147 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
4148 error ("parameter %qD is initialized", decl
);
4153 /* Don't allow initializations for incomplete types except for
4154 arrays which might be completed by the initialization. */
4156 /* This can happen if the array size is an undefined macro.
4157 We already gave a warning, so we don't need another one. */
4158 if (TREE_TYPE (decl
) == error_mark_node
)
4160 else if (COMPLETE_TYPE_P (TREE_TYPE (decl
)))
4162 /* A complete type is ok if size is fixed. */
4164 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl
))) != INTEGER_CST
4165 || C_DECL_VARIABLE_SIZE (decl
))
4167 error ("variable-sized object may not be initialized");
4171 else if (TREE_CODE (TREE_TYPE (decl
)) != ARRAY_TYPE
)
4173 error ("variable %qD has initializer but incomplete type", decl
);
4176 else if (C_DECL_VARIABLE_SIZE (decl
))
4178 /* Although C99 is unclear about whether incomplete arrays
4179 of VLAs themselves count as VLAs, it does not make
4180 sense to permit them to be initialized given that
4181 ordinary VLAs may not be initialized. */
4182 error ("variable-sized object may not be initialized");
4189 if (current_scope
== file_scope
)
4190 TREE_STATIC (decl
) = 1;
4192 /* Tell 'pushdecl' this is an initialized decl
4193 even though we don't yet have the initializer expression.
4194 Also tell 'finish_decl' it may store the real initializer. */
4195 DECL_INITIAL (decl
) = error_mark_node
;
4198 /* If this is a function declaration, write a record describing it to the
4199 prototypes file (if requested). */
4201 if (TREE_CODE (decl
) == FUNCTION_DECL
)
4202 gen_aux_info_record (decl
, 0, 0, prototype_p (TREE_TYPE (decl
)));
4204 /* ANSI specifies that a tentative definition which is not merged with
4205 a non-tentative definition behaves exactly like a definition with an
4206 initializer equal to zero. (Section 3.7.2)
4208 -fno-common gives strict ANSI behavior, though this tends to break
4209 a large body of code that grew up without this rule.
4211 Thread-local variables are never common, since there's no entrenched
4212 body of code to break, and it allows more efficient variable references
4213 in the presence of dynamic linking. */
4215 if (TREE_CODE (decl
) == VAR_DECL
4217 && TREE_PUBLIC (decl
)
4218 && !DECL_THREAD_LOCAL_P (decl
)
4220 DECL_COMMON (decl
) = 1;
4222 /* Set attributes here so if duplicate decl, will have proper attributes. */
4223 c_decl_attributes (&decl
, attributes
, 0);
4225 /* Handle gnu_inline attribute. */
4226 if (declspecs
->inline_p
4227 && !flag_gnu89_inline
4228 && TREE_CODE (decl
) == FUNCTION_DECL
4229 && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl
))
4230 || current_function_decl
))
4232 if (declspecs
->storage_class
== csc_auto
&& current_scope
!= file_scope
)
4234 else if (declspecs
->storage_class
!= csc_static
)
4235 DECL_EXTERNAL (decl
) = !DECL_EXTERNAL (decl
);
4238 if (TREE_CODE (decl
) == FUNCTION_DECL
4239 && targetm
.calls
.promote_prototypes (TREE_TYPE (decl
)))
4241 struct c_declarator
*ce
= declarator
;
4243 if (ce
->kind
== cdk_pointer
)
4244 ce
= declarator
->declarator
;
4245 if (ce
->kind
== cdk_function
)
4247 tree args
= ce
->u
.arg_info
->parms
;
4248 for (; args
; args
= DECL_CHAIN (args
))
4250 tree type
= TREE_TYPE (args
);
4251 if (type
&& INTEGRAL_TYPE_P (type
)
4252 && TYPE_PRECISION (type
) < TYPE_PRECISION (integer_type_node
))
4253 DECL_ARG_TYPE (args
) = c_type_promotes_to (type
);
4258 if (TREE_CODE (decl
) == FUNCTION_DECL
4259 && DECL_DECLARED_INLINE_P (decl
)
4260 && DECL_UNINLINABLE (decl
)
4261 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl
)))
4262 warning (OPT_Wattributes
, "inline function %q+D given attribute noinline",
4265 /* C99 6.7.4p3: An inline definition of a function with external
4266 linkage shall not contain a definition of a modifiable object
4267 with static storage duration... */
4268 if (TREE_CODE (decl
) == VAR_DECL
4269 && current_scope
!= file_scope
4270 && TREE_STATIC (decl
)
4271 && !TREE_READONLY (decl
)
4272 && DECL_DECLARED_INLINE_P (current_function_decl
)
4273 && DECL_EXTERNAL (current_function_decl
))
4274 record_inline_static (input_location
, current_function_decl
,
4275 decl
, csi_modifiable
);
4277 if (c_dialect_objc ()
4278 && (TREE_CODE (decl
) == VAR_DECL
4279 || TREE_CODE (decl
) == FUNCTION_DECL
))
4280 objc_check_global_decl (decl
);
4282 /* Add this decl to the current scope.
4283 TEM may equal DECL or it may be a previous decl of the same name. */
4284 tem
= pushdecl (decl
);
4286 if (initialized
&& DECL_EXTERNAL (tem
))
4288 DECL_EXTERNAL (tem
) = 0;
4289 TREE_STATIC (tem
) = 1;
4295 /* Subroutine of finish_decl. TYPE is the type of an uninitialized object
4296 DECL or the non-array element type if DECL is an uninitialized array.
4297 If that type has a const member, diagnose this. */
4300 diagnose_uninitialized_cst_member (tree decl
, tree type
)
4303 for (field
= TYPE_FIELDS (type
); field
; field
= TREE_CHAIN (field
))
4306 if (TREE_CODE (field
) != FIELD_DECL
)
4308 field_type
= strip_array_types (TREE_TYPE (field
));
4310 if (TYPE_QUALS (field_type
) & TYPE_QUAL_CONST
)
4312 warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wc___compat
,
4313 "uninitialized const member in %qT is invalid in C++",
4314 strip_array_types (TREE_TYPE (decl
)));
4315 inform (DECL_SOURCE_LOCATION (field
), "%qD should be initialized", field
);
4318 if (TREE_CODE (field_type
) == RECORD_TYPE
4319 || TREE_CODE (field_type
) == UNION_TYPE
)
4320 diagnose_uninitialized_cst_member (decl
, field_type
);
4324 /* Finish processing of a declaration;
4325 install its initial value.
4326 If ORIGTYPE is not NULL_TREE, it is the original type of INIT.
4327 If the length of an array type is not known before,
4328 it must be determined now, from the initial value, or it is an error.
4330 INIT_LOC is the location of the initial value. */
4333 finish_decl (tree decl
, location_t init_loc
, tree init
,
4334 tree origtype
, tree asmspec_tree
)
4337 bool was_incomplete
= (DECL_SIZE (decl
) == 0);
4338 const char *asmspec
= 0;
4340 /* If a name was specified, get the string. */
4341 if ((TREE_CODE (decl
) == FUNCTION_DECL
|| TREE_CODE (decl
) == VAR_DECL
)
4342 && DECL_FILE_SCOPE_P (decl
))
4343 asmspec_tree
= maybe_apply_renaming_pragma (decl
, asmspec_tree
);
4345 asmspec
= TREE_STRING_POINTER (asmspec_tree
);
4347 if (TREE_CODE (decl
) == VAR_DECL
4348 && TREE_STATIC (decl
)
4349 && global_bindings_p ())
4350 /* So decl is a global variable. Record the types it uses
4351 so that we can decide later to emit debug info for them. */
4352 record_types_used_by_current_var_decl (decl
);
4354 /* If `start_decl' didn't like having an initialization, ignore it now. */
4355 if (init
!= 0 && DECL_INITIAL (decl
) == 0)
4358 /* Don't crash if parm is initialized. */
4359 if (TREE_CODE (decl
) == PARM_DECL
)
4363 store_init_value (init_loc
, decl
, init
, origtype
);
4365 if (c_dialect_objc () && (TREE_CODE (decl
) == VAR_DECL
4366 || TREE_CODE (decl
) == FUNCTION_DECL
4367 || TREE_CODE (decl
) == FIELD_DECL
))
4368 objc_check_decl (decl
);
4370 type
= TREE_TYPE (decl
);
4372 /* Deduce size of array from initialization, if not already known. */
4373 if (TREE_CODE (type
) == ARRAY_TYPE
4374 && TYPE_DOMAIN (type
) == 0
4375 && TREE_CODE (decl
) != TYPE_DECL
)
4378 = (TREE_STATIC (decl
)
4379 /* Even if pedantic, an external linkage array
4380 may have incomplete type at first. */
4381 ? pedantic
&& !TREE_PUBLIC (decl
)
4382 : !DECL_EXTERNAL (decl
));
4384 = complete_array_type (&TREE_TYPE (decl
), DECL_INITIAL (decl
),
4387 /* Get the completed type made by complete_array_type. */
4388 type
= TREE_TYPE (decl
);
4393 error ("initializer fails to determine size of %q+D", decl
);
4398 error ("array size missing in %q+D", decl
);
4399 /* If a `static' var's size isn't known,
4400 make it extern as well as static, so it does not get
4402 If it is not `static', then do not mark extern;
4403 finish_incomplete_decl will give it a default size
4404 and it will get allocated. */
4405 else if (!pedantic
&& TREE_STATIC (decl
) && !TREE_PUBLIC (decl
))
4406 DECL_EXTERNAL (decl
) = 1;
4410 error ("zero or negative size array %q+D", decl
);
4414 /* For global variables, update the copy of the type that
4415 exists in the binding. */
4416 if (TREE_PUBLIC (decl
))
4418 struct c_binding
*b_ext
= I_SYMBOL_BINDING (DECL_NAME (decl
));
4419 while (b_ext
&& !B_IN_EXTERNAL_SCOPE (b_ext
))
4420 b_ext
= b_ext
->shadowed
;
4423 if (b_ext
->u
.type
&& comptypes (b_ext
->u
.type
, type
))
4424 b_ext
->u
.type
= composite_type (b_ext
->u
.type
, type
);
4426 b_ext
->u
.type
= type
;
4435 if (DECL_INITIAL (decl
))
4436 TREE_TYPE (DECL_INITIAL (decl
)) = type
;
4438 relayout_decl (decl
);
4441 if (TREE_CODE (decl
) == VAR_DECL
)
4443 if (init
&& TREE_CODE (init
) == CONSTRUCTOR
)
4444 add_flexible_array_elts_to_size (decl
, init
);
4446 if (DECL_SIZE (decl
) == 0 && TREE_TYPE (decl
) != error_mark_node
4447 && COMPLETE_TYPE_P (TREE_TYPE (decl
)))
4448 layout_decl (decl
, 0);
4450 if (DECL_SIZE (decl
) == 0
4451 /* Don't give an error if we already gave one earlier. */
4452 && TREE_TYPE (decl
) != error_mark_node
4453 && (TREE_STATIC (decl
)
4454 /* A static variable with an incomplete type
4455 is an error if it is initialized.
4456 Also if it is not file scope.
4457 Otherwise, let it through, but if it is not `extern'
4458 then it may cause an error message later. */
4459 ? (DECL_INITIAL (decl
) != 0
4460 || !DECL_FILE_SCOPE_P (decl
))
4461 /* An automatic variable with an incomplete type
4463 : !DECL_EXTERNAL (decl
)))
4465 error ("storage size of %q+D isn%'t known", decl
);
4466 TREE_TYPE (decl
) = error_mark_node
;
4469 if ((DECL_EXTERNAL (decl
) || TREE_STATIC (decl
))
4470 && DECL_SIZE (decl
) != 0)
4472 if (TREE_CODE (DECL_SIZE (decl
)) == INTEGER_CST
)
4473 constant_expression_warning (DECL_SIZE (decl
));
4476 error ("storage size of %q+D isn%'t constant", decl
);
4477 TREE_TYPE (decl
) = error_mark_node
;
4481 if (TREE_USED (type
))
4483 TREE_USED (decl
) = 1;
4484 DECL_READ_P (decl
) = 1;
4488 /* If this is a function and an assembler name is specified, reset DECL_RTL
4489 so we can give it its new name. Also, update builtin_decl if it
4490 was a normal built-in. */
4491 if (TREE_CODE (decl
) == FUNCTION_DECL
&& asmspec
)
4493 if (DECL_BUILT_IN_CLASS (decl
) == BUILT_IN_NORMAL
)
4494 set_builtin_user_assembler_name (decl
, asmspec
);
4495 set_user_assembler_name (decl
, asmspec
);
4498 /* If #pragma weak was used, mark the decl weak now. */
4499 maybe_apply_pragma_weak (decl
);
4501 /* Output the assembler code and/or RTL code for variables and functions,
4502 unless the type is an undefined structure or union.
4503 If not, it will get done when the type is completed. */
4505 if (TREE_CODE (decl
) == VAR_DECL
|| TREE_CODE (decl
) == FUNCTION_DECL
)
4507 /* Determine the ELF visibility. */
4508 if (TREE_PUBLIC (decl
))
4509 c_determine_visibility (decl
);
4511 /* This is a no-op in c-lang.c or something real in objc-act.c. */
4512 if (c_dialect_objc ())
4513 objc_check_decl (decl
);
4517 /* If this is not a static variable, issue a warning.
4518 It doesn't make any sense to give an ASMSPEC for an
4519 ordinary, non-register local variable. Historically,
4520 GCC has accepted -- but ignored -- the ASMSPEC in
4522 if (!DECL_FILE_SCOPE_P (decl
)
4523 && TREE_CODE (decl
) == VAR_DECL
4524 && !C_DECL_REGISTER (decl
)
4525 && !TREE_STATIC (decl
))
4526 warning (0, "ignoring asm-specifier for non-static local "
4527 "variable %q+D", decl
);
4529 set_user_assembler_name (decl
, asmspec
);
4532 if (DECL_FILE_SCOPE_P (decl
))
4534 if (DECL_INITIAL (decl
) == NULL_TREE
4535 || DECL_INITIAL (decl
) == error_mark_node
)
4536 /* Don't output anything
4537 when a tentative file-scope definition is seen.
4538 But at end of compilation, do output code for them. */
4539 DECL_DEFER_OUTPUT (decl
) = 1;
4540 if (asmspec
&& C_DECL_REGISTER (decl
))
4541 DECL_HARD_REGISTER (decl
) = 1;
4542 rest_of_decl_compilation (decl
, true, 0);
4546 /* In conjunction with an ASMSPEC, the `register'
4547 keyword indicates that we should place the variable
4548 in a particular register. */
4549 if (asmspec
&& C_DECL_REGISTER (decl
))
4551 DECL_HARD_REGISTER (decl
) = 1;
4552 /* This cannot be done for a structure with volatile
4553 fields, on which DECL_REGISTER will have been
4555 if (!DECL_REGISTER (decl
))
4556 error ("cannot put object with volatile field into register");
4559 if (TREE_CODE (decl
) != FUNCTION_DECL
)
4561 /* If we're building a variable sized type, and we might be
4562 reachable other than via the top of the current binding
4563 level, then create a new BIND_EXPR so that we deallocate
4564 the object at the right time. */
4565 /* Note that DECL_SIZE can be null due to errors. */
4566 if (DECL_SIZE (decl
)
4567 && !TREE_CONSTANT (DECL_SIZE (decl
))
4568 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list
))
4571 bind
= build3 (BIND_EXPR
, void_type_node
, NULL
, NULL
, NULL
);
4572 TREE_SIDE_EFFECTS (bind
) = 1;
4574 BIND_EXPR_BODY (bind
) = push_stmt_list ();
4576 add_stmt (build_stmt (DECL_SOURCE_LOCATION (decl
),
4582 if (!DECL_FILE_SCOPE_P (decl
))
4584 /* Recompute the RTL of a local array now
4585 if it used to be an incomplete type. */
4587 && !TREE_STATIC (decl
) && !DECL_EXTERNAL (decl
))
4589 /* If we used it already as memory, it must stay in memory. */
4590 TREE_ADDRESSABLE (decl
) = TREE_USED (decl
);
4591 /* If it's still incomplete now, no init will save it. */
4592 if (DECL_SIZE (decl
) == 0)
4593 DECL_INITIAL (decl
) = 0;
4598 if (TREE_CODE (decl
) == TYPE_DECL
)
4600 if (!DECL_FILE_SCOPE_P (decl
)
4601 && variably_modified_type_p (TREE_TYPE (decl
), NULL_TREE
))
4602 add_stmt (build_stmt (DECL_SOURCE_LOCATION (decl
), DECL_EXPR
, decl
));
4604 rest_of_decl_compilation (decl
, DECL_FILE_SCOPE_P (decl
), 0);
4607 /* Install a cleanup (aka destructor) if one was given. */
4608 if (TREE_CODE (decl
) == VAR_DECL
&& !TREE_STATIC (decl
))
4610 tree attr
= lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl
));
4613 tree cleanup_id
= TREE_VALUE (TREE_VALUE (attr
));
4614 tree cleanup_decl
= lookup_name (cleanup_id
);
4616 vec
<tree
, va_gc
> *v
;
4618 /* Build "cleanup(&decl)" for the destructor. */
4619 cleanup
= build_unary_op (input_location
, ADDR_EXPR
, decl
, 0);
4621 v
->quick_push (cleanup
);
4622 cleanup
= c_build_function_call_vec (DECL_SOURCE_LOCATION (decl
),
4623 vNULL
, cleanup_decl
, v
, NULL
);
4626 /* Don't warn about decl unused; the cleanup uses it. */
4627 TREE_USED (decl
) = 1;
4628 TREE_USED (cleanup_decl
) = 1;
4629 DECL_READ_P (decl
) = 1;
4631 push_cleanup (decl
, cleanup
, false);
4636 && TREE_CODE (decl
) == VAR_DECL
4637 && !DECL_EXTERNAL (decl
)
4638 && DECL_INITIAL (decl
) == NULL_TREE
)
4640 type
= strip_array_types (type
);
4641 if (TREE_READONLY (decl
))
4642 warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wc___compat
,
4643 "uninitialized const %qD is invalid in C++", decl
);
4644 else if ((TREE_CODE (type
) == RECORD_TYPE
4645 || TREE_CODE (type
) == UNION_TYPE
)
4646 && C_TYPE_FIELDS_READONLY (type
))
4647 diagnose_uninitialized_cst_member (decl
, type
);
4650 invoke_plugin_callbacks (PLUGIN_FINISH_DECL
, decl
);
4653 /* Given a parsed parameter declaration, decode it into a PARM_DECL.
4654 EXPR is NULL or a pointer to an expression that needs to be
4655 evaluated for the side effects of array size expressions in the
4659 grokparm (const struct c_parm
*parm
, tree
*expr
)
4661 tree attrs
= parm
->attrs
;
4662 tree decl
= grokdeclarator (parm
->declarator
, parm
->specs
, PARM
, false,
4663 NULL
, &attrs
, expr
, NULL
, DEPRECATED_NORMAL
);
4665 decl_attributes (&decl
, attrs
, 0);
4670 /* Given a parsed parameter declaration, decode it into a PARM_DECL
4671 and push that on the current scope. EXPR is a pointer to an
4672 expression that needs to be evaluated for the side effects of array
4673 size expressions in the parameters. */
4676 push_parm_decl (const struct c_parm
*parm
, tree
*expr
)
4678 tree attrs
= parm
->attrs
;
4681 decl
= grokdeclarator (parm
->declarator
, parm
->specs
, PARM
, false, NULL
,
4682 &attrs
, expr
, NULL
, DEPRECATED_NORMAL
);
4683 decl_attributes (&decl
, attrs
, 0);
4685 decl
= pushdecl (decl
);
4687 finish_decl (decl
, input_location
, NULL_TREE
, NULL_TREE
, NULL_TREE
);
4690 /* Mark all the parameter declarations to date as forward decls.
4691 Also diagnose use of this extension. */
4694 mark_forward_parm_decls (void)
4696 struct c_binding
*b
;
4698 if (pedantic
&& !current_scope
->warned_forward_parm_decls
)
4700 pedwarn (input_location
, OPT_Wpedantic
,
4701 "ISO C forbids forward parameter declarations");
4702 current_scope
->warned_forward_parm_decls
= true;
4705 for (b
= current_scope
->bindings
; b
; b
= b
->prev
)
4706 if (TREE_CODE (b
->decl
) == PARM_DECL
)
4707 TREE_ASM_WRITTEN (b
->decl
) = 1;
4710 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
4711 literal, which may be an incomplete array type completed by the
4712 initializer; INIT is a CONSTRUCTOR at LOC that initializes the compound
4713 literal. NON_CONST is true if the initializers contain something
4714 that cannot occur in a constant expression. */
4717 build_compound_literal (location_t loc
, tree type
, tree init
, bool non_const
)
4719 /* We do not use start_decl here because we have a type, not a declarator;
4720 and do not use finish_decl because the decl should be stored inside
4721 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_EXPR. */
4726 if (type
== error_mark_node
4727 || init
== error_mark_node
)
4728 return error_mark_node
;
4730 decl
= build_decl (loc
, VAR_DECL
, NULL_TREE
, type
);
4731 DECL_EXTERNAL (decl
) = 0;
4732 TREE_PUBLIC (decl
) = 0;
4733 TREE_STATIC (decl
) = (current_scope
== file_scope
);
4734 DECL_CONTEXT (decl
) = current_function_decl
;
4735 TREE_USED (decl
) = 1;
4736 DECL_READ_P (decl
) = 1;
4737 TREE_TYPE (decl
) = type
;
4738 TREE_READONLY (decl
) = (TYPE_READONLY (type
)
4739 || (TREE_CODE (type
) == ARRAY_TYPE
4740 && TYPE_READONLY (TREE_TYPE (type
))));
4741 store_init_value (loc
, decl
, init
, NULL_TREE
);
4743 if (TREE_CODE (type
) == ARRAY_TYPE
&& !COMPLETE_TYPE_P (type
))
4745 int failure
= complete_array_type (&TREE_TYPE (decl
),
4746 DECL_INITIAL (decl
), true);
4747 /* If complete_array_type returns 3, it means that the
4748 initial value of the compound literal is empty. Allow it. */
4749 gcc_assert (failure
== 0 || failure
== 3);
4751 type
= TREE_TYPE (decl
);
4752 TREE_TYPE (DECL_INITIAL (decl
)) = type
;
4755 if (type
== error_mark_node
|| !COMPLETE_TYPE_P (type
))
4757 c_incomplete_type_error (NULL_TREE
, type
);
4758 return error_mark_node
;
4761 stmt
= build_stmt (DECL_SOURCE_LOCATION (decl
), DECL_EXPR
, decl
);
4762 complit
= build1 (COMPOUND_LITERAL_EXPR
, type
, stmt
);
4763 TREE_SIDE_EFFECTS (complit
) = 1;
4765 layout_decl (decl
, 0);
4767 if (TREE_STATIC (decl
))
4769 /* This decl needs a name for the assembler output. */
4770 set_compound_literal_name (decl
);
4771 DECL_DEFER_OUTPUT (decl
) = 1;
4772 DECL_COMDAT (decl
) = 1;
4773 DECL_ARTIFICIAL (decl
) = 1;
4774 DECL_IGNORED_P (decl
) = 1;
4776 rest_of_decl_compilation (decl
, 1, 0);
4781 complit
= build2 (C_MAYBE_CONST_EXPR
, type
, NULL
, complit
);
4782 C_MAYBE_CONST_EXPR_NON_CONST (complit
) = 1;
4788 /* Check the type of a compound literal. Here we just check that it
4789 is valid for C++. */
4792 check_compound_literal_type (location_t loc
, struct c_type_name
*type_name
)
4795 && (type_name
->specs
->typespec_kind
== ctsk_tagdef
4796 || type_name
->specs
->typespec_kind
== ctsk_tagfirstref
))
4797 warning_at (loc
, OPT_Wc___compat
,
4798 "defining a type in a compound literal is invalid in C++");
4801 /* Determine whether TYPE is a structure with a flexible array member,
4802 or a union containing such a structure (possibly recursively). */
4805 flexible_array_type_p (tree type
)
4808 switch (TREE_CODE (type
))
4811 x
= TYPE_FIELDS (type
);
4814 while (DECL_CHAIN (x
) != NULL_TREE
)
4816 if (TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
4817 && TYPE_SIZE (TREE_TYPE (x
)) == NULL_TREE
4818 && TYPE_DOMAIN (TREE_TYPE (x
)) != NULL_TREE
4819 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x
))) == NULL_TREE
)
4823 for (x
= TYPE_FIELDS (type
); x
!= NULL_TREE
; x
= DECL_CHAIN (x
))
4825 if (flexible_array_type_p (TREE_TYPE (x
)))
4834 /* Performs sanity checks on the TYPE and WIDTH of the bit-field NAME,
4835 replacing with appropriate values if they are invalid. */
4837 check_bitfield_type_and_width (tree
*type
, tree
*width
, tree orig_name
)
4840 unsigned int max_width
;
4841 unsigned HOST_WIDE_INT w
;
4842 const char *name
= (orig_name
4843 ? identifier_to_locale (IDENTIFIER_POINTER (orig_name
))
4844 : _("<anonymous>"));
4846 /* Detect and ignore out of range field width and process valid
4848 if (!INTEGRAL_TYPE_P (TREE_TYPE (*width
)))
4850 error ("bit-field %qs width not an integer constant", name
);
4851 *width
= integer_one_node
;
4855 if (TREE_CODE (*width
) != INTEGER_CST
)
4857 *width
= c_fully_fold (*width
, false, NULL
);
4858 if (TREE_CODE (*width
) == INTEGER_CST
)
4859 pedwarn (input_location
, OPT_Wpedantic
,
4860 "bit-field %qs width not an integer constant expression",
4863 if (TREE_CODE (*width
) != INTEGER_CST
)
4865 error ("bit-field %qs width not an integer constant", name
);
4866 *width
= integer_one_node
;
4868 constant_expression_warning (*width
);
4869 if (tree_int_cst_sgn (*width
) < 0)
4871 error ("negative width in bit-field %qs", name
);
4872 *width
= integer_one_node
;
4874 else if (integer_zerop (*width
) && orig_name
)
4876 error ("zero width for bit-field %qs", name
);
4877 *width
= integer_one_node
;
4881 /* Detect invalid bit-field type. */
4882 if (TREE_CODE (*type
) != INTEGER_TYPE
4883 && TREE_CODE (*type
) != BOOLEAN_TYPE
4884 && TREE_CODE (*type
) != ENUMERAL_TYPE
)
4886 error ("bit-field %qs has invalid type", name
);
4887 *type
= unsigned_type_node
;
4890 type_mv
= TYPE_MAIN_VARIANT (*type
);
4891 if (!in_system_header_at (input_location
)
4892 && type_mv
!= integer_type_node
4893 && type_mv
!= unsigned_type_node
4894 && type_mv
!= boolean_type_node
4896 pedwarn (input_location
, OPT_Wpedantic
,
4897 "type of bit-field %qs is a GCC extension", name
);
4899 max_width
= TYPE_PRECISION (*type
);
4901 if (0 < compare_tree_int (*width
, max_width
))
4903 error ("width of %qs exceeds its type", name
);
4905 *width
= build_int_cst (integer_type_node
, w
);
4908 w
= tree_to_uhwi (*width
);
4910 if (TREE_CODE (*type
) == ENUMERAL_TYPE
)
4912 struct lang_type
*lt
= TYPE_LANG_SPECIFIC (*type
);
4914 || w
< tree_int_cst_min_precision (lt
->enum_min
, TYPE_SIGN (*type
))
4915 || w
< tree_int_cst_min_precision (lt
->enum_max
, TYPE_SIGN (*type
)))
4916 warning (0, "%qs is narrower than values of its type", name
);
4922 /* Print warning about variable length array if necessary. */
4925 warn_variable_length_array (tree name
, tree size
)
4927 int const_size
= TREE_CONSTANT (size
);
4929 if (!flag_isoc99
&& pedantic
&& warn_vla
!= 0)
4934 pedwarn (input_location
, OPT_Wvla
,
4935 "ISO C90 forbids array %qE whose size "
4936 "can%'t be evaluated",
4939 pedwarn (input_location
, OPT_Wvla
, "ISO C90 forbids array whose size "
4940 "can%'t be evaluated");
4945 pedwarn (input_location
, OPT_Wvla
,
4946 "ISO C90 forbids variable length array %qE",
4949 pedwarn (input_location
, OPT_Wvla
, "ISO C90 forbids variable length array");
4952 else if (warn_vla
> 0)
4958 "the size of array %qE can"
4959 "%'t be evaluated", name
);
4962 "the size of array can %'t be evaluated");
4968 "variable length array %qE is used",
4972 "variable length array is used");
4977 /* Given declspecs and a declarator,
4978 determine the name and type of the object declared
4979 and construct a ..._DECL node for it.
4980 (In one case we can return a ..._TYPE node instead.
4981 For invalid input we sometimes return 0.)
4983 DECLSPECS is a c_declspecs structure for the declaration specifiers.
4985 DECL_CONTEXT says which syntactic context this declaration is in:
4986 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
4987 FUNCDEF for a function definition. Like NORMAL but a few different
4988 error messages in each case. Return value may be zero meaning
4989 this definition is too screwy to try to parse.
4990 PARM for a parameter declaration (either within a function prototype
4991 or before a function body). Make a PARM_DECL, or return void_type_node.
4992 TYPENAME if for a typename (in a cast or sizeof).
4993 Don't make a DECL node; just return the ..._TYPE node.
4994 FIELD for a struct or union field; make a FIELD_DECL.
4995 INITIALIZED is true if the decl has an initializer.
4996 WIDTH is non-NULL for bit-fields, and is a pointer to an INTEGER_CST node
4997 representing the width of the bit-field.
4998 DECL_ATTRS points to the list of attributes that should be added to this
4999 decl. Any nested attributes that belong on the decl itself will be
5001 If EXPR is not NULL, any expressions that need to be evaluated as
5002 part of evaluating variably modified types will be stored in *EXPR.
5003 If EXPR_CONST_OPERANDS is not NULL, *EXPR_CONST_OPERANDS will be
5004 set to indicate whether operands in *EXPR can be used in constant
5006 DEPRECATED_STATE is a deprecated_states value indicating whether
5007 deprecation warnings should be suppressed.
5009 In the TYPENAME case, DECLARATOR is really an absolute declarator.
5010 It may also be so in the PARM case, for a prototype where the
5011 argument type is specified but not the name.
5013 This function is where the complicated C meanings of `static'
5014 and `extern' are interpreted. */
5017 grokdeclarator (const struct c_declarator
*declarator
,
5018 struct c_declspecs
*declspecs
,
5019 enum decl_context decl_context
, bool initialized
, tree
*width
,
5020 tree
*decl_attrs
, tree
*expr
, bool *expr_const_operands
,
5021 enum deprecated_states deprecated_state
)
5023 tree type
= declspecs
->type
;
5024 bool threadp
= declspecs
->thread_p
;
5025 enum c_storage_class storage_class
= declspecs
->storage_class
;
5030 int type_quals
= TYPE_UNQUALIFIED
;
5031 tree name
= NULL_TREE
;
5032 bool funcdef_flag
= false;
5033 bool funcdef_syntax
= false;
5034 bool size_varies
= false;
5035 tree decl_attr
= declspecs
->decl_attr
;
5036 int array_ptr_quals
= TYPE_UNQUALIFIED
;
5037 tree array_ptr_attrs
= NULL_TREE
;
5038 int array_parm_static
= 0;
5039 bool array_parm_vla_unspec_p
= false;
5040 tree returned_attrs
= NULL_TREE
;
5041 bool bitfield
= width
!= NULL
;
5043 struct c_arg_info
*arg_info
= 0;
5044 addr_space_t as1
, as2
, address_space
;
5045 location_t loc
= UNKNOWN_LOCATION
;
5048 bool expr_const_operands_dummy
;
5049 enum c_declarator_kind first_non_attr_kind
;
5050 unsigned int alignas_align
= 0;
5052 if (TREE_CODE (type
) == ERROR_MARK
)
5053 return error_mark_node
;
5056 if (expr_const_operands
== NULL
)
5057 expr_const_operands
= &expr_const_operands_dummy
;
5059 *expr
= declspecs
->expr
;
5060 *expr_const_operands
= declspecs
->expr_const_operands
;
5062 if (decl_context
== FUNCDEF
)
5063 funcdef_flag
= true, decl_context
= NORMAL
;
5065 /* Look inside a declarator for the name being declared
5066 and get it as an IDENTIFIER_NODE, for an error message. */
5068 const struct c_declarator
*decl
= declarator
;
5070 first_non_attr_kind
= cdk_attrs
;
5080 funcdef_syntax
= (decl
->kind
== cdk_function
);
5081 decl
= decl
->declarator
;
5082 if (first_non_attr_kind
== cdk_attrs
)
5083 first_non_attr_kind
= decl
->kind
;
5087 decl
= decl
->declarator
;
5094 if (first_non_attr_kind
== cdk_attrs
)
5095 first_non_attr_kind
= decl
->kind
;
5104 gcc_assert (decl_context
== PARM
5105 || decl_context
== TYPENAME
5106 || (decl_context
== FIELD
5107 && declarator
->kind
== cdk_id
));
5108 gcc_assert (!initialized
);
5112 /* A function definition's declarator must have the form of
5113 a function declarator. */
5115 if (funcdef_flag
&& !funcdef_syntax
)
5118 /* If this looks like a function definition, make it one,
5119 even if it occurs where parms are expected.
5120 Then store_parm_decls will reject it and not use it as a parm. */
5121 if (decl_context
== NORMAL
&& !funcdef_flag
&& current_scope
->parm_flag
)
5122 decl_context
= PARM
;
5124 if (declspecs
->deprecated_p
&& deprecated_state
!= DEPRECATED_SUPPRESS
)
5125 warn_deprecated_use (declspecs
->type
, declspecs
->decl_attr
);
5127 if ((decl_context
== NORMAL
|| decl_context
== FIELD
)
5128 && current_scope
== file_scope
5129 && variably_modified_type_p (type
, NULL_TREE
))
5132 error_at (loc
, "variably modified %qE at file scope", name
);
5134 error_at (loc
, "variably modified field at file scope");
5135 type
= integer_type_node
;
5138 size_varies
= C_TYPE_VARIABLE_SIZE (type
) != 0;
5140 /* Diagnose defaulting to "int". */
5142 if (declspecs
->default_int_p
&& !in_system_header_at (input_location
))
5144 /* Issue a warning if this is an ISO C 99 program or if
5145 -Wreturn-type and this is a function, or if -Wimplicit;
5146 prefer the former warning since it is more explicit. */
5147 if ((warn_implicit_int
|| warn_return_type
|| flag_isoc99
)
5149 warn_about_return_type
= 1;
5153 pedwarn_c99 (loc
, flag_isoc99
? 0 : OPT_Wimplicit_int
,
5154 "type defaults to %<int%> in declaration of %qE",
5157 pedwarn_c99 (input_location
, flag_isoc99
? 0 : OPT_Wimplicit_int
,
5158 "type defaults to %<int%> in type name");
5162 /* Adjust the type if a bit-field is being declared,
5163 -funsigned-bitfields applied and the type is not explicitly
5165 if (bitfield
&& !flag_signed_bitfields
&& !declspecs
->explicit_signed_p
5166 && TREE_CODE (type
) == INTEGER_TYPE
)
5167 type
= unsigned_type_for (type
);
5169 /* Figure out the type qualifiers for the declaration. There are
5170 two ways a declaration can become qualified. One is something
5171 like `const int i' where the `const' is explicit. Another is
5172 something like `typedef const int CI; CI i' where the type of the
5173 declaration contains the `const'. A third possibility is that
5174 there is a type qualifier on the element type of a typedefed
5175 array type, in which case we should extract that qualifier so
5176 that c_apply_type_quals_to_decl receives the full list of
5177 qualifiers to work with (C90 is not entirely clear about whether
5178 duplicate qualifiers should be diagnosed in this case, but it
5179 seems most appropriate to do so). */
5180 element_type
= strip_array_types (type
);
5181 constp
= declspecs
->const_p
+ TYPE_READONLY (element_type
);
5182 restrictp
= declspecs
->restrict_p
+ TYPE_RESTRICT (element_type
);
5183 volatilep
= declspecs
->volatile_p
+ TYPE_VOLATILE (element_type
);
5184 atomicp
= declspecs
->atomic_p
+ TYPE_ATOMIC (element_type
);
5185 as1
= declspecs
->address_space
;
5186 as2
= TYPE_ADDR_SPACE (element_type
);
5187 address_space
= ADDR_SPACE_GENERIC_P (as1
)? as2
: as1
;
5189 if (pedantic
&& !flag_isoc99
)
5192 pedwarn (loc
, OPT_Wpedantic
, "duplicate %<const%>");
5194 pedwarn (loc
, OPT_Wpedantic
, "duplicate %<restrict%>");
5196 pedwarn (loc
, OPT_Wpedantic
, "duplicate %<volatile%>");
5198 pedwarn (loc
, OPT_Wpedantic
, "duplicate %<_Atomic%>");
5202 if (!ADDR_SPACE_GENERIC_P (as1
) && !ADDR_SPACE_GENERIC_P (as2
) && as1
!= as2
)
5203 error_at (loc
, "conflicting named address spaces (%s vs %s)",
5204 c_addr_space_name (as1
), c_addr_space_name (as2
));
5206 if ((TREE_CODE (type
) == ARRAY_TYPE
5207 || first_non_attr_kind
== cdk_array
)
5208 && TYPE_QUALS (element_type
))
5209 type
= TYPE_MAIN_VARIANT (type
);
5210 type_quals
= ((constp
? TYPE_QUAL_CONST
: 0)
5211 | (restrictp
? TYPE_QUAL_RESTRICT
: 0)
5212 | (volatilep
? TYPE_QUAL_VOLATILE
: 0)
5213 | (atomicp
? TYPE_QUAL_ATOMIC
: 0)
5214 | ENCODE_QUAL_ADDR_SPACE (address_space
));
5216 /* Applying the _Atomic qualifier to an array type (through the use
5217 of typedefs or typeof) must be detected here. If the qualifier
5218 is introduced later, any appearance of applying it to an array is
5219 actually applying it to an element of that array. */
5220 if (atomicp
&& TREE_CODE (type
) == ARRAY_TYPE
)
5221 error_at (loc
, "%<_Atomic%>-qualified array type");
5223 /* Warn about storage classes that are invalid for certain
5224 kinds of declarations (parameters, typenames, etc.). */
5228 || storage_class
== csc_auto
5229 || storage_class
== csc_register
5230 || storage_class
== csc_typedef
))
5232 if (storage_class
== csc_auto
)
5234 (current_scope
== file_scope
) ? 0 : OPT_Wpedantic
,
5235 "function definition declared %<auto%>");
5236 if (storage_class
== csc_register
)
5237 error_at (loc
, "function definition declared %<register%>");
5238 if (storage_class
== csc_typedef
)
5239 error_at (loc
, "function definition declared %<typedef%>");
5241 error_at (loc
, "function definition declared %qs",
5242 declspecs
->thread_gnu_p
? "__thread" : "_Thread_local");
5244 if (storage_class
== csc_auto
5245 || storage_class
== csc_register
5246 || storage_class
== csc_typedef
)
5247 storage_class
= csc_none
;
5249 else if (decl_context
!= NORMAL
&& (storage_class
!= csc_none
|| threadp
))
5251 if (decl_context
== PARM
&& storage_class
== csc_register
)
5255 switch (decl_context
)
5259 error_at (loc
, "storage class specified for structure "
5262 error_at (loc
, "storage class specified for structure field");
5266 error_at (loc
, "storage class specified for parameter %qE",
5269 error_at (loc
, "storage class specified for unnamed parameter");
5272 error_at (loc
, "storage class specified for typename");
5275 storage_class
= csc_none
;
5279 else if (storage_class
== csc_extern
5283 /* 'extern' with initialization is invalid if not at file scope. */
5284 if (current_scope
== file_scope
)
5286 /* It is fine to have 'extern const' when compiling at C
5287 and C++ intersection. */
5288 if (!(warn_cxx_compat
&& constp
))
5289 warning_at (loc
, 0, "%qE initialized and declared %<extern%>",
5293 error_at (loc
, "%qE has both %<extern%> and initializer", name
);
5295 else if (current_scope
== file_scope
)
5297 if (storage_class
== csc_auto
)
5298 error_at (loc
, "file-scope declaration of %qE specifies %<auto%>",
5300 if (pedantic
&& storage_class
== csc_register
)
5301 pedwarn (input_location
, OPT_Wpedantic
,
5302 "file-scope declaration of %qE specifies %<register%>", name
);
5306 if (storage_class
== csc_extern
&& funcdef_flag
)
5307 error_at (loc
, "nested function %qE declared %<extern%>", name
);
5308 else if (threadp
&& storage_class
== csc_none
)
5310 error_at (loc
, "function-scope %qE implicitly auto and declared "
5312 declspecs
->thread_gnu_p
? "__thread" : "_Thread_local");
5317 /* Now figure out the structure of the declarator proper.
5318 Descend through it, creating more complex types, until we reach
5319 the declared identifier (or NULL_TREE, in an absolute declarator).
5320 At each stage we maintain an unqualified version of the type
5321 together with any qualifiers that should be applied to it with
5322 c_build_qualified_type; this way, array types including
5323 multidimensional array types are first built up in unqualified
5324 form and then the qualified form is created with
5325 TYPE_MAIN_VARIANT pointing to the unqualified form. */
5327 while (declarator
&& declarator
->kind
!= cdk_id
)
5329 if (type
== error_mark_node
)
5331 declarator
= declarator
->declarator
;
5335 /* Each level of DECLARATOR is either a cdk_array (for ...[..]),
5336 a cdk_pointer (for *...),
5337 a cdk_function (for ...(...)),
5338 a cdk_attrs (for nested attributes),
5339 or a cdk_id (for the name being declared
5340 or the place in an absolute declarator
5341 where the name was omitted).
5342 For the last case, we have just exited the loop.
5344 At this point, TYPE is the type of elements of an array,
5345 or for a function to return, or for a pointer to point to.
5346 After this sequence of ifs, TYPE is the type of the
5347 array or function or pointer, and DECLARATOR has had its
5348 outermost layer removed. */
5350 if (array_ptr_quals
!= TYPE_UNQUALIFIED
5351 || array_ptr_attrs
!= NULL_TREE
5352 || array_parm_static
)
5354 /* Only the innermost declarator (making a parameter be of
5355 array type which is converted to pointer type)
5356 may have static or type qualifiers. */
5357 error_at (loc
, "static or type qualifiers in non-parameter array declarator");
5358 array_ptr_quals
= TYPE_UNQUALIFIED
;
5359 array_ptr_attrs
= NULL_TREE
;
5360 array_parm_static
= 0;
5363 switch (declarator
->kind
)
5367 /* A declarator with embedded attributes. */
5368 tree attrs
= declarator
->u
.attrs
;
5369 const struct c_declarator
*inner_decl
;
5371 declarator
= declarator
->declarator
;
5372 inner_decl
= declarator
;
5373 while (inner_decl
->kind
== cdk_attrs
)
5374 inner_decl
= inner_decl
->declarator
;
5375 if (inner_decl
->kind
== cdk_id
)
5376 attr_flags
|= (int) ATTR_FLAG_DECL_NEXT
;
5377 else if (inner_decl
->kind
== cdk_function
)
5378 attr_flags
|= (int) ATTR_FLAG_FUNCTION_NEXT
;
5379 else if (inner_decl
->kind
== cdk_array
)
5380 attr_flags
|= (int) ATTR_FLAG_ARRAY_NEXT
;
5381 returned_attrs
= decl_attributes (&type
,
5382 chainon (returned_attrs
, attrs
),
5388 tree itype
= NULL_TREE
;
5389 tree size
= declarator
->u
.array
.dimen
;
5390 /* The index is a signed object `sizetype' bits wide. */
5391 tree index_type
= c_common_signed_type (sizetype
);
5393 array_ptr_quals
= declarator
->u
.array
.quals
;
5394 array_ptr_attrs
= declarator
->u
.array
.attrs
;
5395 array_parm_static
= declarator
->u
.array
.static_p
;
5396 array_parm_vla_unspec_p
= declarator
->u
.array
.vla_unspec_p
;
5398 declarator
= declarator
->declarator
;
5400 /* Check for some types that there cannot be arrays of. */
5402 if (VOID_TYPE_P (type
))
5405 error_at (loc
, "declaration of %qE as array of voids", name
);
5407 error_at (loc
, "declaration of type name as array of voids");
5408 type
= error_mark_node
;
5411 if (TREE_CODE (type
) == FUNCTION_TYPE
)
5414 error_at (loc
, "declaration of %qE as array of functions",
5417 error_at (loc
, "declaration of type name as array of "
5419 type
= error_mark_node
;
5422 if (pedantic
&& !in_system_header_at (input_location
)
5423 && flexible_array_type_p (type
))
5424 pedwarn (loc
, OPT_Wpedantic
,
5425 "invalid use of structure with flexible array member");
5427 if (size
== error_mark_node
)
5428 type
= error_mark_node
;
5430 if (type
== error_mark_node
)
5433 /* If size was specified, set ITYPE to a range-type for
5434 that size. Otherwise, ITYPE remains null. finish_decl
5435 may figure it out from an initial value. */
5439 bool size_maybe_const
= true;
5440 bool size_int_const
= (TREE_CODE (size
) == INTEGER_CST
5441 && !TREE_OVERFLOW (size
));
5442 bool this_size_varies
= false;
5444 /* Strip NON_LVALUE_EXPRs since we aren't using as an
5446 STRIP_TYPE_NOPS (size
);
5448 if (!INTEGRAL_TYPE_P (TREE_TYPE (size
)))
5451 error_at (loc
, "size of array %qE has non-integer type",
5455 "size of unnamed array has non-integer type");
5456 size
= integer_one_node
;
5459 size
= c_fully_fold (size
, false, &size_maybe_const
);
5461 if (pedantic
&& size_maybe_const
&& integer_zerop (size
))
5464 pedwarn (loc
, OPT_Wpedantic
,
5465 "ISO C forbids zero-size array %qE", name
);
5467 pedwarn (loc
, OPT_Wpedantic
,
5468 "ISO C forbids zero-size array");
5471 if (TREE_CODE (size
) == INTEGER_CST
&& size_maybe_const
)
5473 constant_expression_warning (size
);
5474 if (tree_int_cst_sgn (size
) < 0)
5477 error_at (loc
, "size of array %qE is negative", name
);
5479 error_at (loc
, "size of unnamed array is negative");
5480 size
= integer_one_node
;
5482 /* Handle a size folded to an integer constant but
5483 not an integer constant expression. */
5484 if (!size_int_const
)
5486 /* If this is a file scope declaration of an
5487 ordinary identifier, this is invalid code;
5488 diagnosing it here and not subsequently
5489 treating the type as variable-length avoids
5490 more confusing diagnostics later. */
5491 if ((decl_context
== NORMAL
|| decl_context
== FIELD
)
5492 && current_scope
== file_scope
)
5493 pedwarn (input_location
, 0,
5494 "variably modified %qE at file scope",
5497 this_size_varies
= size_varies
= true;
5498 warn_variable_length_array (name
, size
);
5501 else if ((decl_context
== NORMAL
|| decl_context
== FIELD
)
5502 && current_scope
== file_scope
)
5504 error_at (loc
, "variably modified %qE at file scope", name
);
5505 size
= integer_one_node
;
5509 /* Make sure the array size remains visibly
5510 nonconstant even if it is (eg) a const variable
5511 with known value. */
5512 this_size_varies
= size_varies
= true;
5513 warn_variable_length_array (name
, size
);
5514 if (flag_sanitize
& SANITIZE_VLA
5515 && decl_context
== NORMAL
5516 && current_function_decl
!= NULL_TREE
5517 && !lookup_attribute ("no_sanitize_undefined",
5519 (current_function_decl
)))
5521 /* Evaluate the array size only once. */
5522 size
= c_save_expr (size
);
5523 size
= c_fully_fold (size
, false, NULL
);
5524 size
= fold_build2 (COMPOUND_EXPR
, TREE_TYPE (size
),
5525 ubsan_instrument_vla (loc
, size
),
5530 if (integer_zerop (size
) && !this_size_varies
)
5532 /* A zero-length array cannot be represented with
5533 an unsigned index type, which is what we'll
5534 get with build_index_type. Create an
5535 open-ended range instead. */
5536 itype
= build_range_type (sizetype
, size
, NULL_TREE
);
5540 /* Arrange for the SAVE_EXPR on the inside of the
5541 MINUS_EXPR, which allows the -1 to get folded
5542 with the +1 that happens when building TYPE_SIZE. */
5544 size
= save_expr (size
);
5545 if (this_size_varies
&& TREE_CODE (size
) == INTEGER_CST
)
5546 size
= build2 (COMPOUND_EXPR
, TREE_TYPE (size
),
5547 integer_zero_node
, size
);
5549 /* Compute the maximum valid index, that is, size
5550 - 1. Do the calculation in index_type, so that
5551 if it is a variable the computations will be
5552 done in the proper mode. */
5553 itype
= fold_build2_loc (loc
, MINUS_EXPR
, index_type
,
5554 convert (index_type
, size
),
5555 convert (index_type
,
5558 /* The above overflows when size does not fit
5560 ??? While a size of INT_MAX+1 technically shouldn't
5561 cause an overflow (because we subtract 1), handling
5562 this case seems like an unnecessary complication. */
5563 if (TREE_CODE (size
) == INTEGER_CST
5564 && !int_fits_type_p (size
, index_type
))
5567 error_at (loc
, "size of array %qE is too large",
5570 error_at (loc
, "size of unnamed array is too large");
5571 type
= error_mark_node
;
5575 itype
= build_index_type (itype
);
5577 if (this_size_varies
)
5580 *expr
= build2 (COMPOUND_EXPR
, TREE_TYPE (size
),
5584 *expr_const_operands
&= size_maybe_const
;
5587 else if (decl_context
== FIELD
)
5589 bool flexible_array_member
= false;
5590 if (array_parm_vla_unspec_p
)
5591 /* Field names can in fact have function prototype
5592 scope so [*] is disallowed here through making
5593 the field variably modified, not through being
5594 something other than a declaration with function
5599 const struct c_declarator
*t
= declarator
;
5600 while (t
->kind
== cdk_attrs
)
5602 flexible_array_member
= (t
->kind
== cdk_id
);
5604 if (flexible_array_member
5605 && pedantic
&& !flag_isoc99
5606 && !in_system_header_at (input_location
))
5607 pedwarn (loc
, OPT_Wpedantic
,
5608 "ISO C90 does not support flexible array members");
5610 /* ISO C99 Flexible array members are effectively
5611 identical to GCC's zero-length array extension. */
5612 if (flexible_array_member
|| array_parm_vla_unspec_p
)
5613 itype
= build_range_type (sizetype
, size_zero_node
,
5616 else if (decl_context
== PARM
)
5618 if (array_parm_vla_unspec_p
)
5620 itype
= build_range_type (sizetype
, size_zero_node
, NULL_TREE
);
5624 else if (decl_context
== TYPENAME
)
5626 if (array_parm_vla_unspec_p
)
5629 warning (0, "%<[*]%> not in a declaration");
5630 /* We use this to avoid messing up with incomplete
5631 array types of the same type, that would
5632 otherwise be modified below. */
5633 itype
= build_range_type (sizetype
, size_zero_node
,
5639 /* Complain about arrays of incomplete types. */
5640 if (!COMPLETE_TYPE_P (type
))
5642 error_at (loc
, "array type has incomplete element type");
5643 type
= error_mark_node
;
5646 /* When itype is NULL, a shared incomplete array type is
5647 returned for all array of a given type. Elsewhere we
5648 make sure we don't complete that type before copying
5649 it, but here we want to make sure we don't ever
5650 modify the shared type, so we gcc_assert (itype)
5653 addr_space_t as
= DECODE_QUAL_ADDR_SPACE (type_quals
);
5654 if (!ADDR_SPACE_GENERIC_P (as
) && as
!= TYPE_ADDR_SPACE (type
))
5655 type
= build_qualified_type (type
,
5656 ENCODE_QUAL_ADDR_SPACE (as
));
5658 type
= build_array_type (type
, itype
);
5661 if (type
!= error_mark_node
)
5665 /* It is ok to modify type here even if itype is
5666 NULL: if size_varies, we're in a
5667 multi-dimensional array and the inner type has
5668 variable size, so the enclosing shared array type
5670 if (size
&& TREE_CODE (size
) == INTEGER_CST
)
5672 = build_distinct_type_copy (TYPE_MAIN_VARIANT (type
));
5673 C_TYPE_VARIABLE_SIZE (type
) = 1;
5676 /* The GCC extension for zero-length arrays differs from
5677 ISO flexible array members in that sizeof yields
5679 if (size
&& integer_zerop (size
))
5682 type
= build_distinct_type_copy (TYPE_MAIN_VARIANT (type
));
5683 TYPE_SIZE (type
) = bitsize_zero_node
;
5684 TYPE_SIZE_UNIT (type
) = size_zero_node
;
5685 SET_TYPE_STRUCTURAL_EQUALITY (type
);
5687 if (array_parm_vla_unspec_p
)
5690 /* The type is complete. C99 6.7.5.2p4 */
5691 type
= build_distinct_type_copy (TYPE_MAIN_VARIANT (type
));
5692 TYPE_SIZE (type
) = bitsize_zero_node
;
5693 TYPE_SIZE_UNIT (type
) = size_zero_node
;
5694 SET_TYPE_STRUCTURAL_EQUALITY (type
);
5698 if (decl_context
!= PARM
5699 && (array_ptr_quals
!= TYPE_UNQUALIFIED
5700 || array_ptr_attrs
!= NULL_TREE
5701 || array_parm_static
))
5703 error_at (loc
, "static or type qualifiers in non-parameter array declarator");
5704 array_ptr_quals
= TYPE_UNQUALIFIED
;
5705 array_ptr_attrs
= NULL_TREE
;
5706 array_parm_static
= 0;
5712 /* Say it's a definition only for the declarator closest
5713 to the identifier, apart possibly from some
5715 bool really_funcdef
= false;
5719 const struct c_declarator
*t
= declarator
->declarator
;
5720 while (t
->kind
== cdk_attrs
)
5722 really_funcdef
= (t
->kind
== cdk_id
);
5725 /* Declaring a function type. Make sure we have a valid
5726 type for the function to return. */
5727 if (type
== error_mark_node
)
5730 size_varies
= false;
5732 /* Warn about some types functions can't return. */
5733 if (TREE_CODE (type
) == FUNCTION_TYPE
)
5736 error_at (loc
, "%qE declared as function returning a "
5739 error_at (loc
, "type name declared as function "
5740 "returning a function");
5741 type
= integer_type_node
;
5743 if (TREE_CODE (type
) == ARRAY_TYPE
)
5746 error_at (loc
, "%qE declared as function returning an array",
5749 error_at (loc
, "type name declared as function returning "
5751 type
= integer_type_node
;
5753 errmsg
= targetm
.invalid_return_type (type
);
5757 type
= integer_type_node
;
5760 /* Construct the function type and go to the next
5761 inner layer of declarator. */
5762 arg_info
= declarator
->u
.arg_info
;
5763 arg_types
= grokparms (arg_info
, really_funcdef
);
5765 /* Type qualifiers before the return type of the function
5766 qualify the return type, not the function type. */
5769 /* Type qualifiers on a function return type are
5770 normally permitted by the standard but have no
5771 effect, so give a warning at -Wreturn-type.
5772 Qualifiers on a void return type are banned on
5773 function definitions in ISO C; GCC used to used
5774 them for noreturn functions. */
5775 if (VOID_TYPE_P (type
) && really_funcdef
)
5777 "function definition has qualified void return type");
5779 warning_at (loc
, OPT_Wignored_qualifiers
,
5780 "type qualifiers ignored on function return type");
5782 type
= c_build_qualified_type (type
, type_quals
);
5784 type_quals
= TYPE_UNQUALIFIED
;
5786 type
= build_function_type (type
, arg_types
);
5787 declarator
= declarator
->declarator
;
5789 /* Set the TYPE_CONTEXTs for each tagged type which is local to
5790 the formal parameter list of this FUNCTION_TYPE to point to
5791 the FUNCTION_TYPE node itself. */
5796 FOR_EACH_VEC_SAFE_ELT_REVERSE (arg_info
->tags
, ix
, tag
)
5797 TYPE_CONTEXT (tag
->type
) = type
;
5803 /* Merge any constancy or volatility into the target type
5805 if ((type_quals
& TYPE_QUAL_ATOMIC
)
5806 && TREE_CODE (type
) == FUNCTION_TYPE
)
5809 "%<_Atomic%>-qualified function type");
5810 type_quals
&= ~TYPE_QUAL_ATOMIC
;
5812 else if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
5814 pedwarn (loc
, OPT_Wpedantic
,
5815 "ISO C forbids qualified function types");
5817 type
= c_build_qualified_type (type
, type_quals
);
5818 size_varies
= false;
5820 /* When the pointed-to type involves components of variable size,
5821 care must be taken to ensure that the size evaluation code is
5822 emitted early enough to dominate all the possible later uses
5823 and late enough for the variables on which it depends to have
5826 This is expected to happen automatically when the pointed-to
5827 type has a name/declaration of it's own, but special attention
5828 is required if the type is anonymous.
5830 We handle the NORMAL and FIELD contexts here by attaching an
5831 artificial TYPE_DECL to such pointed-to type. This forces the
5832 sizes evaluation at a safe point and ensures it is not deferred
5833 until e.g. within a deeper conditional context.
5835 We expect nothing to be needed here for PARM or TYPENAME.
5836 Pushing a TYPE_DECL at this point for TYPENAME would actually
5837 be incorrect, as we might be in the middle of an expression
5838 with side effects on the pointed-to type size "arguments" prior
5839 to the pointer declaration point and the fake TYPE_DECL in the
5840 enclosing context would force the size evaluation prior to the
5843 if (!TYPE_NAME (type
)
5844 && (decl_context
== NORMAL
|| decl_context
== FIELD
)
5845 && variably_modified_type_p (type
, NULL_TREE
))
5847 tree decl
= build_decl (loc
, TYPE_DECL
, NULL_TREE
, type
);
5848 DECL_ARTIFICIAL (decl
) = 1;
5850 finish_decl (decl
, loc
, NULL_TREE
, NULL_TREE
, NULL_TREE
);
5851 TYPE_NAME (type
) = decl
;
5854 type
= c_build_pointer_type (type
);
5856 /* Process type qualifiers (such as const or volatile)
5857 that were given inside the `*'. */
5858 type_quals
= declarator
->u
.pointer_quals
;
5860 declarator
= declarator
->declarator
;
5867 *decl_attrs
= chainon (returned_attrs
, *decl_attrs
);
5869 /* Now TYPE has the actual type, apart from any qualifiers in
5872 /* Warn about address space used for things other than static memory or
5874 address_space
= DECODE_QUAL_ADDR_SPACE (type_quals
);
5875 if (!ADDR_SPACE_GENERIC_P (address_space
))
5877 if (decl_context
== NORMAL
)
5879 switch (storage_class
)
5882 error ("%qs combined with %<auto%> qualifier for %qE",
5883 c_addr_space_name (address_space
), name
);
5886 error ("%qs combined with %<register%> qualifier for %qE",
5887 c_addr_space_name (address_space
), name
);
5890 if (current_function_scope
)
5892 error ("%qs specified for auto variable %qE",
5893 c_addr_space_name (address_space
), name
);
5905 else if (decl_context
== PARM
&& TREE_CODE (type
) != ARRAY_TYPE
)
5908 error ("%qs specified for parameter %qE",
5909 c_addr_space_name (address_space
), name
);
5911 error ("%qs specified for unnamed parameter",
5912 c_addr_space_name (address_space
));
5914 else if (decl_context
== FIELD
)
5917 error ("%qs specified for structure field %qE",
5918 c_addr_space_name (address_space
), name
);
5920 error ("%qs specified for structure field",
5921 c_addr_space_name (address_space
));
5925 /* Check the type and width of a bit-field. */
5928 check_bitfield_type_and_width (&type
, width
, name
);
5929 /* C11 makes it implementation-defined (6.7.2.1#5) whether
5930 atomic types are permitted for bit-fields; we have no code to
5931 make bit-field accesses atomic, so disallow them. */
5932 if (type_quals
& TYPE_QUAL_ATOMIC
)
5935 error ("bit-field %qE has atomic type", name
);
5937 error ("bit-field has atomic type");
5938 type_quals
&= ~TYPE_QUAL_ATOMIC
;
5942 /* Reject invalid uses of _Alignas. */
5943 if (declspecs
->alignas_p
)
5945 if (storage_class
== csc_typedef
)
5946 error_at (loc
, "alignment specified for typedef %qE", name
);
5947 else if (storage_class
== csc_register
)
5948 error_at (loc
, "alignment specified for %<register%> object %qE",
5950 else if (decl_context
== PARM
)
5953 error_at (loc
, "alignment specified for parameter %qE", name
);
5955 error_at (loc
, "alignment specified for unnamed parameter");
5960 error_at (loc
, "alignment specified for bit-field %qE", name
);
5962 error_at (loc
, "alignment specified for unnamed bit-field");
5964 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
5965 error_at (loc
, "alignment specified for function %qE", name
);
5966 else if (declspecs
->align_log
!= -1)
5968 alignas_align
= 1U << declspecs
->align_log
;
5969 if (alignas_align
< min_align_of_type (type
))
5972 error_at (loc
, "%<_Alignas%> specifiers cannot reduce "
5973 "alignment of %qE", name
);
5975 error_at (loc
, "%<_Alignas%> specifiers cannot reduce "
5976 "alignment of unnamed field");
5982 /* Did array size calculations overflow or does the array cover more
5983 than half of the address-space? */
5984 if (TREE_CODE (type
) == ARRAY_TYPE
5985 && COMPLETE_TYPE_P (type
)
5986 && TREE_CODE (TYPE_SIZE_UNIT (type
)) == INTEGER_CST
5987 && ! valid_constant_size_p (TYPE_SIZE_UNIT (type
)))
5990 error_at (loc
, "size of array %qE is too large", name
);
5992 error_at (loc
, "size of unnamed array is too large");
5993 /* If we proceed with the array type as it is, we'll eventually
5994 crash in tree_to_[su]hwi(). */
5995 type
= error_mark_node
;
5998 /* If this is declaring a typedef name, return a TYPE_DECL. */
6000 if (storage_class
== csc_typedef
)
6003 if ((type_quals
& TYPE_QUAL_ATOMIC
)
6004 && TREE_CODE (type
) == FUNCTION_TYPE
)
6007 "%<_Atomic%>-qualified function type");
6008 type_quals
&= ~TYPE_QUAL_ATOMIC
;
6010 else if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
6012 pedwarn (loc
, OPT_Wpedantic
,
6013 "ISO C forbids qualified function types");
6015 type
= c_build_qualified_type (type
, type_quals
);
6016 decl
= build_decl (declarator
->id_loc
,
6017 TYPE_DECL
, declarator
->u
.id
, type
);
6018 if (declspecs
->explicit_signed_p
)
6019 C_TYPEDEF_EXPLICITLY_SIGNED (decl
) = 1;
6020 if (declspecs
->inline_p
)
6021 pedwarn (loc
, 0,"typedef %q+D declared %<inline%>", decl
);
6022 if (declspecs
->noreturn_p
)
6023 pedwarn (loc
, 0,"typedef %q+D declared %<_Noreturn%>", decl
);
6025 if (warn_cxx_compat
&& declarator
->u
.id
!= NULL_TREE
)
6027 struct c_binding
*b
= I_TAG_BINDING (declarator
->u
.id
);
6030 && b
->decl
!= NULL_TREE
6031 && (B_IN_CURRENT_SCOPE (b
)
6032 || (current_scope
== file_scope
&& B_IN_EXTERNAL_SCOPE (b
)))
6033 && TYPE_MAIN_VARIANT (b
->decl
) != TYPE_MAIN_VARIANT (type
))
6035 warning_at (declarator
->id_loc
, OPT_Wc___compat
,
6036 ("using %qD as both a typedef and a tag is "
6039 if (b
->locus
!= UNKNOWN_LOCATION
)
6040 inform (b
->locus
, "originally defined here");
6047 /* If this is a type name (such as, in a cast or sizeof),
6048 compute the type and return it now. */
6050 if (decl_context
== TYPENAME
)
6052 /* Note that the grammar rejects storage classes in typenames
6054 gcc_assert (storage_class
== csc_none
&& !threadp
6055 && !declspecs
->inline_p
&& !declspecs
->noreturn_p
);
6056 if ((type_quals
& TYPE_QUAL_ATOMIC
)
6057 && TREE_CODE (type
) == FUNCTION_TYPE
)
6060 "%<_Atomic%>-qualified function type");
6061 type_quals
&= ~TYPE_QUAL_ATOMIC
;
6063 else if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
6065 pedwarn (loc
, OPT_Wpedantic
,
6066 "ISO C forbids const or volatile function types");
6068 type
= c_build_qualified_type (type
, type_quals
);
6072 if (pedantic
&& decl_context
== FIELD
6073 && variably_modified_type_p (type
, NULL_TREE
))
6076 pedwarn (loc
, OPT_Wpedantic
, "a member of a structure or union cannot "
6077 "have a variably modified type");
6080 /* Aside from typedefs and type names (handle above),
6081 `void' at top level (not within pointer)
6082 is allowed only in public variables.
6083 We don't complain about parms either, but that is because
6084 a better error message can be made later. */
6086 if (VOID_TYPE_P (type
) && decl_context
!= PARM
6087 && !((decl_context
!= FIELD
&& TREE_CODE (type
) != FUNCTION_TYPE
)
6088 && (storage_class
== csc_extern
6089 || (current_scope
== file_scope
6090 && !(storage_class
== csc_static
6091 || storage_class
== csc_register
)))))
6093 error_at (loc
, "variable or field %qE declared void", name
);
6094 type
= integer_type_node
;
6097 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
6098 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
6103 if (decl_context
== PARM
)
6106 bool array_parameter_p
= false;
6108 /* A parameter declared as an array of T is really a pointer to T.
6109 One declared as a function is really a pointer to a function. */
6111 if (TREE_CODE (type
) == ARRAY_TYPE
)
6113 /* Transfer const-ness of array into that of type pointed to. */
6114 type
= TREE_TYPE (type
);
6116 type
= c_build_qualified_type (type
, type_quals
);
6117 type
= c_build_pointer_type (type
);
6118 type_quals
= array_ptr_quals
;
6120 type
= c_build_qualified_type (type
, type_quals
);
6122 /* We don't yet implement attributes in this context. */
6123 if (array_ptr_attrs
!= NULL_TREE
)
6124 warning_at (loc
, OPT_Wattributes
,
6125 "attributes in parameter array declarator ignored");
6127 size_varies
= false;
6128 array_parameter_p
= true;
6130 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
6132 if (type_quals
& TYPE_QUAL_ATOMIC
)
6135 "%<_Atomic%>-qualified function type");
6136 type_quals
&= ~TYPE_QUAL_ATOMIC
;
6138 else if (type_quals
)
6139 pedwarn (loc
, OPT_Wpedantic
,
6140 "ISO C forbids qualified function types");
6142 type
= c_build_qualified_type (type
, type_quals
);
6143 type
= c_build_pointer_type (type
);
6144 type_quals
= TYPE_UNQUALIFIED
;
6146 else if (type_quals
)
6147 type
= c_build_qualified_type (type
, type_quals
);
6149 decl
= build_decl (declarator
->id_loc
,
6150 PARM_DECL
, declarator
->u
.id
, type
);
6152 C_DECL_VARIABLE_SIZE (decl
) = 1;
6153 C_ARRAY_PARAMETER (decl
) = array_parameter_p
;
6155 /* Compute the type actually passed in the parmlist,
6156 for the case where there is no prototype.
6157 (For example, shorts and chars are passed as ints.)
6158 When there is a prototype, this is overridden later. */
6160 if (type
== error_mark_node
)
6161 promoted_type
= type
;
6163 promoted_type
= c_type_promotes_to (type
);
6165 DECL_ARG_TYPE (decl
) = promoted_type
;
6166 if (declspecs
->inline_p
)
6167 pedwarn (loc
, 0, "parameter %q+D declared %<inline%>", decl
);
6168 if (declspecs
->noreturn_p
)
6169 pedwarn (loc
, 0, "parameter %q+D declared %<_Noreturn%>", decl
);
6171 else if (decl_context
== FIELD
)
6173 /* Note that the grammar rejects storage classes in typenames
6175 gcc_assert (storage_class
== csc_none
&& !threadp
6176 && !declspecs
->inline_p
&& !declspecs
->noreturn_p
);
6178 /* Structure field. It may not be a function. */
6180 if (TREE_CODE (type
) == FUNCTION_TYPE
)
6182 error_at (loc
, "field %qE declared as a function", name
);
6183 type
= build_pointer_type (type
);
6185 else if (TREE_CODE (type
) != ERROR_MARK
6186 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type
))
6189 error_at (loc
, "field %qE has incomplete type", name
);
6191 error_at (loc
, "unnamed field has incomplete type");
6192 type
= error_mark_node
;
6194 type
= c_build_qualified_type (type
, type_quals
);
6195 decl
= build_decl (declarator
->id_loc
,
6196 FIELD_DECL
, declarator
->u
.id
, type
);
6197 DECL_NONADDRESSABLE_P (decl
) = bitfield
;
6198 if (bitfield
&& !declarator
->u
.id
)
6199 TREE_NO_WARNING (decl
) = 1;
6202 C_DECL_VARIABLE_SIZE (decl
) = 1;
6204 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
6206 if (storage_class
== csc_register
|| threadp
)
6208 error_at (loc
, "invalid storage class for function %qE", name
);
6210 else if (current_scope
!= file_scope
)
6212 /* Function declaration not at file scope. Storage
6213 classes other than `extern' are not allowed, C99
6214 6.7.1p5, and `extern' makes no difference. However,
6215 GCC allows 'auto', perhaps with 'inline', to support
6216 nested functions. */
6217 if (storage_class
== csc_auto
)
6218 pedwarn (loc
, OPT_Wpedantic
,
6219 "invalid storage class for function %qE", name
);
6220 else if (storage_class
== csc_static
)
6222 error_at (loc
, "invalid storage class for function %qE", name
);
6224 storage_class
= declspecs
->storage_class
= csc_none
;
6230 decl
= build_decl (declarator
->id_loc
,
6231 FUNCTION_DECL
, declarator
->u
.id
, type
);
6232 decl
= build_decl_attribute_variant (decl
, decl_attr
);
6234 if (type_quals
& TYPE_QUAL_ATOMIC
)
6237 "%<_Atomic%>-qualified function type");
6238 type_quals
&= ~TYPE_QUAL_ATOMIC
;
6240 else if (pedantic
&& type_quals
&& !DECL_IN_SYSTEM_HEADER (decl
))
6241 pedwarn (loc
, OPT_Wpedantic
,
6242 "ISO C forbids qualified function types");
6244 /* Every function declaration is an external reference
6245 (DECL_EXTERNAL) except for those which are not at file
6246 scope and are explicitly declared "auto". This is
6247 forbidden by standard C (C99 6.7.1p5) and is interpreted by
6248 GCC to signify a forward declaration of a nested function. */
6249 if (storage_class
== csc_auto
&& current_scope
!= file_scope
)
6250 DECL_EXTERNAL (decl
) = 0;
6251 /* In C99, a function which is declared 'inline' with 'extern'
6252 is not an external reference (which is confusing). It
6253 means that the later definition of the function must be output
6254 in this file, C99 6.7.4p6. In GNU C89, a function declared
6255 'extern inline' is an external reference. */
6256 else if (declspecs
->inline_p
&& storage_class
!= csc_static
)
6257 DECL_EXTERNAL (decl
) = ((storage_class
== csc_extern
)
6258 == flag_gnu89_inline
);
6260 DECL_EXTERNAL (decl
) = !initialized
;
6262 /* Record absence of global scope for `static' or `auto'. */
6264 = !(storage_class
== csc_static
|| storage_class
== csc_auto
);
6266 /* For a function definition, record the argument information
6267 block where store_parm_decls will look for it. */
6269 current_function_arg_info
= arg_info
;
6271 if (declspecs
->default_int_p
)
6272 C_FUNCTION_IMPLICIT_INT (decl
) = 1;
6274 /* Record presence of `inline' and `_Noreturn', if it is
6276 if (flag_hosted
&& MAIN_NAME_P (declarator
->u
.id
))
6278 if (declspecs
->inline_p
)
6279 pedwarn (loc
, 0, "cannot inline function %<main%>");
6280 if (declspecs
->noreturn_p
)
6281 pedwarn (loc
, 0, "%<main%> declared %<_Noreturn%>");
6285 if (declspecs
->inline_p
)
6286 /* Record that the function is declared `inline'. */
6287 DECL_DECLARED_INLINE_P (decl
) = 1;
6288 if (declspecs
->noreturn_p
)
6293 pedwarn (loc
, OPT_Wpedantic
,
6294 "ISO C99 does not support %<_Noreturn%>");
6296 pedwarn (loc
, OPT_Wpedantic
,
6297 "ISO C90 does not support %<_Noreturn%>");
6299 TREE_THIS_VOLATILE (decl
) = 1;
6305 /* It's a variable. */
6306 /* An uninitialized decl with `extern' is a reference. */
6307 int extern_ref
= !initialized
&& storage_class
== csc_extern
;
6309 type
= c_build_qualified_type (type
, type_quals
);
6311 /* C99 6.2.2p7: It is invalid (compile-time undefined
6312 behavior) to create an 'extern' declaration for a
6313 variable if there is a global declaration that is
6314 'static' and the global declaration is not visible.
6315 (If the static declaration _is_ currently visible,
6316 the 'extern' declaration is taken to refer to that decl.) */
6317 if (extern_ref
&& current_scope
!= file_scope
)
6319 tree global_decl
= identifier_global_value (declarator
->u
.id
);
6320 tree visible_decl
= lookup_name (declarator
->u
.id
);
6323 && global_decl
!= visible_decl
6324 && TREE_CODE (global_decl
) == VAR_DECL
6325 && !TREE_PUBLIC (global_decl
))
6326 error_at (loc
, "variable previously declared %<static%> "
6327 "redeclared %<extern%>");
6330 decl
= build_decl (declarator
->id_loc
,
6331 VAR_DECL
, declarator
->u
.id
, type
);
6333 C_DECL_VARIABLE_SIZE (decl
) = 1;
6335 if (declspecs
->inline_p
)
6336 pedwarn (loc
, 0, "variable %q+D declared %<inline%>", decl
);
6337 if (declspecs
->noreturn_p
)
6338 pedwarn (loc
, 0, "variable %q+D declared %<_Noreturn%>", decl
);
6340 /* At file scope, an initialized extern declaration may follow
6341 a static declaration. In that case, DECL_EXTERNAL will be
6342 reset later in start_decl. */
6343 DECL_EXTERNAL (decl
) = (storage_class
== csc_extern
);
6345 /* At file scope, the presence of a `static' or `register' storage
6346 class specifier, or the absence of all storage class specifiers
6347 makes this declaration a definition (perhaps tentative). Also,
6348 the absence of `static' makes it public. */
6349 if (current_scope
== file_scope
)
6351 TREE_PUBLIC (decl
) = storage_class
!= csc_static
;
6352 TREE_STATIC (decl
) = !extern_ref
;
6354 /* Not at file scope, only `static' makes a static definition. */
6357 TREE_STATIC (decl
) = (storage_class
== csc_static
);
6358 TREE_PUBLIC (decl
) = extern_ref
;
6362 set_decl_tls_model (decl
, decl_default_tls_model (decl
));
6365 if ((storage_class
== csc_extern
6366 || (storage_class
== csc_none
6367 && TREE_CODE (type
) == FUNCTION_TYPE
6369 && variably_modified_type_p (type
, NULL_TREE
))
6372 if (TREE_CODE (type
) == FUNCTION_TYPE
)
6373 error_at (loc
, "non-nested function with variably modified type");
6375 error_at (loc
, "object with variably modified type must have "
6379 /* Record `register' declaration for warnings on &
6380 and in case doing stupid register allocation. */
6382 if (storage_class
== csc_register
)
6384 C_DECL_REGISTER (decl
) = 1;
6385 DECL_REGISTER (decl
) = 1;
6388 /* Record constancy and volatility. */
6389 c_apply_type_quals_to_decl (type_quals
, decl
);
6391 /* Apply _Alignas specifiers. */
6394 DECL_ALIGN (decl
) = alignas_align
* BITS_PER_UNIT
;
6395 DECL_USER_ALIGN (decl
) = 1;
6398 /* If a type has volatile components, it should be stored in memory.
6399 Otherwise, the fact that those components are volatile
6400 will be ignored, and would even crash the compiler.
6401 Of course, this only makes sense on VAR,PARM, and RESULT decl's. */
6402 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl
))
6403 && (TREE_CODE (decl
) == VAR_DECL
|| TREE_CODE (decl
) == PARM_DECL
6404 || TREE_CODE (decl
) == RESULT_DECL
))
6406 /* It is not an error for a structure with volatile fields to
6407 be declared register, but reset DECL_REGISTER since it
6408 cannot actually go in a register. */
6409 int was_reg
= C_DECL_REGISTER (decl
);
6410 C_DECL_REGISTER (decl
) = 0;
6411 DECL_REGISTER (decl
) = 0;
6412 c_mark_addressable (decl
);
6413 C_DECL_REGISTER (decl
) = was_reg
;
6416 /* This is the earliest point at which we might know the assembler
6417 name of a variable. Thus, if it's known before this, die horribly. */
6418 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl
));
6421 && TREE_CODE (decl
) == VAR_DECL
6422 && TREE_PUBLIC (decl
)
6423 && TREE_STATIC (decl
)
6424 && (TREE_CODE (TREE_TYPE (decl
)) == RECORD_TYPE
6425 || TREE_CODE (TREE_TYPE (decl
)) == UNION_TYPE
6426 || TREE_CODE (TREE_TYPE (decl
)) == ENUMERAL_TYPE
)
6427 && TYPE_NAME (TREE_TYPE (decl
)) == NULL_TREE
)
6428 warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wc___compat
,
6429 ("non-local variable %qD with anonymous type is "
6430 "questionable in C++"),
6437 /* Decode the parameter-list info for a function type or function definition.
6438 The argument is the value returned by `get_parm_info' (or made in c-parse.c
6439 if there is an identifier list instead of a parameter decl list).
6440 These two functions are separate because when a function returns
6441 or receives functions then each is called multiple times but the order
6442 of calls is different. The last call to `grokparms' is always the one
6443 that contains the formal parameter names of a function definition.
6445 Return a list of arg types to use in the FUNCTION_TYPE for this function.
6447 FUNCDEF_FLAG is true for a function definition, false for
6448 a mere declaration. A nonempty identifier-list gets an error message
6449 when FUNCDEF_FLAG is false. */
6452 grokparms (struct c_arg_info
*arg_info
, bool funcdef_flag
)
6454 tree arg_types
= arg_info
->types
;
6456 if (funcdef_flag
&& arg_info
->had_vla_unspec
)
6458 /* A function definition isn't function prototype scope C99 6.2.1p4. */
6460 error ("%<[*]%> not allowed in other than function prototype scope");
6463 if (arg_types
== 0 && !funcdef_flag
6464 && !in_system_header_at (input_location
))
6465 warning (OPT_Wstrict_prototypes
,
6466 "function declaration isn%'t a prototype");
6468 if (arg_types
== error_mark_node
)
6469 return 0; /* don't set TYPE_ARG_TYPES in this case */
6471 else if (arg_types
&& TREE_CODE (TREE_VALUE (arg_types
)) == IDENTIFIER_NODE
)
6475 pedwarn (input_location
, 0, "parameter names (without types) in function declaration");
6476 arg_info
->parms
= NULL_TREE
;
6479 arg_info
->parms
= arg_info
->types
;
6481 arg_info
->types
= 0;
6486 tree parm
, type
, typelt
;
6487 unsigned int parmno
;
6490 /* If there is a parameter of incomplete type in a definition,
6491 this is an error. In a declaration this is valid, and a
6492 struct or union type may be completed later, before any calls
6493 or definition of the function. In the case where the tag was
6494 first declared within the parameter list, a warning has
6495 already been given. If a parameter has void type, then
6496 however the function cannot be defined or called, so
6499 for (parm
= arg_info
->parms
, typelt
= arg_types
, parmno
= 1;
6501 parm
= DECL_CHAIN (parm
), typelt
= TREE_CHAIN (typelt
), parmno
++)
6503 type
= TREE_VALUE (typelt
);
6504 if (type
== error_mark_node
)
6507 if (!COMPLETE_TYPE_P (type
))
6511 if (DECL_NAME (parm
))
6512 error_at (input_location
,
6513 "parameter %u (%q+D) has incomplete type",
6516 error_at (DECL_SOURCE_LOCATION (parm
),
6517 "parameter %u has incomplete type",
6520 TREE_VALUE (typelt
) = error_mark_node
;
6521 TREE_TYPE (parm
) = error_mark_node
;
6522 arg_types
= NULL_TREE
;
6524 else if (VOID_TYPE_P (type
))
6526 if (DECL_NAME (parm
))
6527 warning_at (input_location
, 0,
6528 "parameter %u (%q+D) has void type",
6531 warning_at (DECL_SOURCE_LOCATION (parm
), 0,
6532 "parameter %u has void type",
6537 errmsg
= targetm
.invalid_parameter_type (type
);
6541 TREE_VALUE (typelt
) = error_mark_node
;
6542 TREE_TYPE (parm
) = error_mark_node
;
6543 arg_types
= NULL_TREE
;
6546 if (DECL_NAME (parm
) && TREE_USED (parm
))
6547 warn_if_shadowing (parm
);
6553 /* Allocate and initialize a c_arg_info structure from the parser's
6557 build_arg_info (void)
6559 struct c_arg_info
*ret
= XOBNEW (&parser_obstack
, struct c_arg_info
);
6560 ret
->parms
= NULL_TREE
;
6562 ret
->types
= NULL_TREE
;
6563 ret
->others
= NULL_TREE
;
6564 ret
->pending_sizes
= NULL
;
6565 ret
->had_vla_unspec
= 0;
6569 /* Take apart the current scope and return a c_arg_info structure with
6570 info on a parameter list just parsed.
6572 This structure is later fed to 'grokparms' and 'store_parm_decls'.
6574 ELLIPSIS being true means the argument list ended in '...' so don't
6575 append a sentinel (void_list_node) to the end of the type-list.
6577 EXPR is NULL or an expression that needs to be evaluated for the
6578 side effects of array size expressions in the parameters. */
6581 get_parm_info (bool ellipsis
, tree expr
)
6583 struct c_binding
*b
= current_scope
->bindings
;
6584 struct c_arg_info
*arg_info
= build_arg_info ();
6587 vec
<c_arg_tag
, va_gc
> *tags
= NULL
;
6591 static bool explained_incomplete_types
= false;
6592 bool gave_void_only_once_err
= false;
6594 arg_info
->had_vla_unspec
= current_scope
->had_vla_unspec
;
6596 /* The bindings in this scope must not get put into a block.
6597 We will take care of deleting the binding nodes. */
6598 current_scope
->bindings
= 0;
6600 /* This function is only called if there was *something* on the
6604 /* A parameter list consisting solely of 'void' indicates that the
6605 function takes no arguments. But if the 'void' is qualified
6606 (by 'const' or 'volatile'), or has a storage class specifier
6607 ('register'), then the behavior is undefined; issue an error.
6608 Typedefs for 'void' are OK (see DR#157). */
6609 if (b
->prev
== 0 /* one binding */
6610 && TREE_CODE (b
->decl
) == PARM_DECL
/* which is a parameter */
6611 && !DECL_NAME (b
->decl
) /* anonymous */
6612 && VOID_TYPE_P (TREE_TYPE (b
->decl
))) /* of void type */
6614 if (TYPE_QUALS (TREE_TYPE (b
->decl
)) != TYPE_UNQUALIFIED
6615 || C_DECL_REGISTER (b
->decl
))
6616 error ("%<void%> as only parameter may not be qualified");
6618 /* There cannot be an ellipsis. */
6620 error ("%<void%> must be the only parameter");
6622 arg_info
->types
= void_list_node
;
6627 types
= void_list_node
;
6629 /* Break up the bindings list into parms, tags, types, and others;
6630 apply sanity checks; purge the name-to-decl bindings. */
6633 tree decl
= b
->decl
;
6634 tree type
= TREE_TYPE (decl
);
6636 const char *keyword
;
6638 switch (TREE_CODE (decl
))
6643 gcc_assert (I_SYMBOL_BINDING (b
->id
) == b
);
6644 I_SYMBOL_BINDING (b
->id
) = b
->shadowed
;
6647 /* Check for forward decls that never got their actual decl. */
6648 if (TREE_ASM_WRITTEN (decl
))
6649 error ("parameter %q+D has just a forward declaration", decl
);
6650 /* Check for (..., void, ...) and issue an error. */
6651 else if (VOID_TYPE_P (type
) && !DECL_NAME (decl
))
6653 if (!gave_void_only_once_err
)
6655 error ("%<void%> must be the only parameter");
6656 gave_void_only_once_err
= true;
6661 /* Valid parameter, add it to the list. */
6662 DECL_CHAIN (decl
) = parms
;
6665 /* Since there is a prototype, args are passed in their
6666 declared types. The back end may override this later. */
6667 DECL_ARG_TYPE (decl
) = type
;
6668 types
= tree_cons (0, type
, types
);
6672 case ENUMERAL_TYPE
: keyword
= "enum"; goto tag
;
6673 case UNION_TYPE
: keyword
= "union"; goto tag
;
6674 case RECORD_TYPE
: keyword
= "struct"; goto tag
;
6676 /* Types may not have tag-names, in which case the type
6677 appears in the bindings list with b->id NULL. */
6680 gcc_assert (I_TAG_BINDING (b
->id
) == b
);
6681 I_TAG_BINDING (b
->id
) = b
->shadowed
;
6684 /* Warn about any struct, union or enum tags defined in a
6685 parameter list. The scope of such types is limited to
6686 the parameter list, which is rarely if ever desirable
6687 (it's impossible to call such a function with type-
6688 correct arguments). An anonymous union parm type is
6689 meaningful as a GNU extension, so don't warn for that. */
6690 if (TREE_CODE (decl
) != UNION_TYPE
|| b
->id
!= 0)
6693 /* The %s will be one of 'struct', 'union', or 'enum'. */
6694 warning (0, "%<%s %E%> declared inside parameter list",
6697 /* The %s will be one of 'struct', 'union', or 'enum'. */
6698 warning (0, "anonymous %s declared inside parameter list",
6701 if (!explained_incomplete_types
)
6703 warning (0, "its scope is only this definition or declaration,"
6704 " which is probably not what you want");
6705 explained_incomplete_types
= true;
6711 vec_safe_push (tags
, tag
);
6717 /* CONST_DECLs appear here when we have an embedded enum,
6718 and TYPE_DECLs appear here when we have an embedded struct
6719 or union. No warnings for this - we already warned about the
6720 type itself. FUNCTION_DECLs appear when there is an implicit
6721 function declaration in the parameter list. */
6723 /* When we reinsert this decl in the function body, we need
6724 to reconstruct whether it was marked as nested. */
6725 gcc_assert (TREE_CODE (decl
) == FUNCTION_DECL
6728 DECL_CHAIN (decl
) = others
;
6733 /* error_mark_node appears here when we have an undeclared
6734 variable. Just throw it away. */
6737 gcc_assert (I_SYMBOL_BINDING (b
->id
) == b
);
6738 I_SYMBOL_BINDING (b
->id
) = b
->shadowed
;
6742 /* Other things that might be encountered. */
6749 b
= free_binding_and_advance (b
);
6752 arg_info
->parms
= parms
;
6753 arg_info
->tags
= tags
;
6754 arg_info
->types
= types
;
6755 arg_info
->others
= others
;
6756 arg_info
->pending_sizes
= expr
;
6760 /* Get the struct, enum or union (CODE says which) with tag NAME.
6761 Define the tag as a forward-reference with location LOC if it is
6762 not defined. Return a c_typespec structure for the type
6766 parser_xref_tag (location_t loc
, enum tree_code code
, tree name
)
6768 struct c_typespec ret
;
6772 ret
.expr
= NULL_TREE
;
6773 ret
.expr_const_operands
= true;
6775 /* If a cross reference is requested, look up the type
6776 already defined for this tag and return it. */
6778 ref
= lookup_tag (code
, name
, 0, &refloc
);
6779 /* If this is the right type of tag, return what we found.
6780 (This reference will be shadowed by shadow_tag later if appropriate.)
6781 If this is the wrong type of tag, do not return it. If it was the
6782 wrong type in the same scope, we will have had an error
6783 message already; if in a different scope and declaring
6784 a name, pending_xref_error will give an error message; but if in a
6785 different scope and not declaring a name, this tag should
6786 shadow the previous declaration of a different type of tag, and
6787 this would not work properly if we return the reference found.
6788 (For example, with "struct foo" in an outer scope, "union foo;"
6789 must shadow that tag with a new one of union type.) */
6790 ret
.kind
= (ref
? ctsk_tagref
: ctsk_tagfirstref
);
6791 if (ref
&& TREE_CODE (ref
) == code
)
6793 if (C_TYPE_DEFINED_IN_STRUCT (ref
)
6794 && loc
!= UNKNOWN_LOCATION
6800 warning_at (loc
, OPT_Wc___compat
,
6801 ("enum type defined in struct or union "
6802 "is not visible in C++"));
6803 inform (refloc
, "enum type defined here");
6806 warning_at (loc
, OPT_Wc___compat
,
6807 ("struct defined in struct or union "
6808 "is not visible in C++"));
6809 inform (refloc
, "struct defined here");
6812 warning_at (loc
, OPT_Wc___compat
,
6813 ("union defined in struct or union "
6814 "is not visible in C++"));
6815 inform (refloc
, "union defined here");
6826 /* If no such tag is yet defined, create a forward-reference node
6827 and record it as the "definition".
6828 When a real declaration of this type is found,
6829 the forward-reference will be altered into a real type. */
6831 ref
= make_node (code
);
6832 if (code
== ENUMERAL_TYPE
)
6834 /* Give the type a default layout like unsigned int
6835 to avoid crashing if it does not get defined. */
6836 SET_TYPE_MODE (ref
, TYPE_MODE (unsigned_type_node
));
6837 TYPE_ALIGN (ref
) = TYPE_ALIGN (unsigned_type_node
);
6838 TYPE_USER_ALIGN (ref
) = 0;
6839 TYPE_UNSIGNED (ref
) = 1;
6840 TYPE_PRECISION (ref
) = TYPE_PRECISION (unsigned_type_node
);
6841 TYPE_MIN_VALUE (ref
) = TYPE_MIN_VALUE (unsigned_type_node
);
6842 TYPE_MAX_VALUE (ref
) = TYPE_MAX_VALUE (unsigned_type_node
);
6845 pushtag (loc
, name
, ref
);
6851 /* Get the struct, enum or union (CODE says which) with tag NAME.
6852 Define the tag as a forward-reference if it is not defined.
6853 Return a tree for the type. */
6856 xref_tag (enum tree_code code
, tree name
)
6858 return parser_xref_tag (input_location
, code
, name
).spec
;
6861 /* Make sure that the tag NAME is defined *in the current scope*
6862 at least as a forward reference.
6863 LOC is the location of the struct's definition.
6864 CODE says which kind of tag NAME ought to be.
6866 This stores the current value of the file static STRUCT_PARSE_INFO
6867 in *ENCLOSING_STRUCT_PARSE_INFO, and points STRUCT_PARSE_INFO at a
6868 new c_struct_parse_info structure. The old value of
6869 STRUCT_PARSE_INFO is restored in finish_struct. */
6872 start_struct (location_t loc
, enum tree_code code
, tree name
,
6873 struct c_struct_parse_info
**enclosing_struct_parse_info
)
6875 /* If there is already a tag defined at this scope
6876 (as a forward reference), just return it. */
6878 tree ref
= NULL_TREE
;
6879 location_t refloc
= UNKNOWN_LOCATION
;
6881 if (name
!= NULL_TREE
)
6882 ref
= lookup_tag (code
, name
, 1, &refloc
);
6883 if (ref
&& TREE_CODE (ref
) == code
)
6885 if (TYPE_SIZE (ref
))
6887 if (code
== UNION_TYPE
)
6888 error_at (loc
, "redefinition of %<union %E%>", name
);
6890 error_at (loc
, "redefinition of %<struct %E%>", name
);
6891 if (refloc
!= UNKNOWN_LOCATION
)
6892 inform (refloc
, "originally defined here");
6893 /* Don't create structures using a name already in use. */
6896 else if (C_TYPE_BEING_DEFINED (ref
))
6898 if (code
== UNION_TYPE
)
6899 error_at (loc
, "nested redefinition of %<union %E%>", name
);
6901 error_at (loc
, "nested redefinition of %<struct %E%>", name
);
6902 /* Don't bother to report "originally defined here" for a
6903 nested redefinition; the original definition should be
6905 /* Don't create structures that contain themselves. */
6910 /* Otherwise create a forward-reference just so the tag is in scope. */
6912 if (ref
== NULL_TREE
|| TREE_CODE (ref
) != code
)
6914 ref
= make_node (code
);
6915 pushtag (loc
, name
, ref
);
6918 C_TYPE_BEING_DEFINED (ref
) = 1;
6919 TYPE_PACKED (ref
) = flag_pack_struct
;
6921 *enclosing_struct_parse_info
= struct_parse_info
;
6922 struct_parse_info
= XNEW (struct c_struct_parse_info
);
6923 struct_parse_info
->struct_types
.create (0);
6924 struct_parse_info
->fields
.create (0);
6925 struct_parse_info
->typedefs_seen
.create (0);
6927 /* FIXME: This will issue a warning for a use of a type defined
6928 within a statement expr used within sizeof, et. al. This is not
6929 terribly serious as C++ doesn't permit statement exprs within
6931 if (warn_cxx_compat
&& (in_sizeof
|| in_typeof
|| in_alignof
))
6932 warning_at (loc
, OPT_Wc___compat
,
6933 "defining type in %qs expression is invalid in C++",
6936 : (in_typeof
? "typeof" : "alignof")));
6941 /* Process the specs, declarator and width (NULL if omitted)
6942 of a structure component, returning a FIELD_DECL node.
6943 WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node.
6944 DECL_ATTRS is as for grokdeclarator.
6946 LOC is the location of the structure component.
6948 This is done during the parsing of the struct declaration.
6949 The FIELD_DECL nodes are chained together and the lot of them
6950 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
6953 grokfield (location_t loc
,
6954 struct c_declarator
*declarator
, struct c_declspecs
*declspecs
,
6955 tree width
, tree
*decl_attrs
)
6959 if (declarator
->kind
== cdk_id
&& declarator
->u
.id
== NULL_TREE
6960 && width
== NULL_TREE
)
6962 /* This is an unnamed decl.
6964 If we have something of the form "union { list } ;" then this
6965 is the anonymous union extension. Similarly for struct.
6967 If this is something of the form "struct foo;", then
6968 If MS or Plan 9 extensions are enabled, this is handled as
6969 an anonymous struct.
6970 Otherwise this is a forward declaration of a structure tag.
6972 If this is something of the form "foo;" and foo is a TYPE_DECL, then
6973 If foo names a structure or union without a tag, then this
6974 is an anonymous struct (this is permitted by C11).
6975 If MS or Plan 9 extensions are enabled and foo names a
6976 structure, then again this is an anonymous struct.
6977 Otherwise this is an error.
6979 Oh what a horrid tangled web we weave. I wonder if MS consciously
6980 took this from Plan 9 or if it was an accident of implementation
6981 that took root before someone noticed the bug... */
6983 tree type
= declspecs
->type
;
6984 bool type_ok
= (TREE_CODE (type
) == RECORD_TYPE
6985 || TREE_CODE (type
) == UNION_TYPE
);
6989 && (flag_ms_extensions
6990 || flag_plan9_extensions
6991 || !declspecs
->typedef_p
))
6993 if (flag_ms_extensions
|| flag_plan9_extensions
)
6995 else if (TYPE_NAME (type
) == NULL
)
7002 pedwarn (loc
, 0, "declaration does not declare anything");
7008 pedwarn (loc
, OPT_Wpedantic
,
7009 "ISO C99 doesn%'t support unnamed structs/unions");
7011 pedwarn (loc
, OPT_Wpedantic
,
7012 "ISO C90 doesn%'t support unnamed structs/unions");
7016 value
= grokdeclarator (declarator
, declspecs
, FIELD
, false,
7017 width
? &width
: NULL
, decl_attrs
, NULL
, NULL
,
7020 finish_decl (value
, loc
, NULL_TREE
, NULL_TREE
, NULL_TREE
);
7021 DECL_INITIAL (value
) = width
;
7023 if (warn_cxx_compat
&& DECL_NAME (value
) != NULL_TREE
)
7025 /* If we currently have a binding for this field, set the
7026 in_struct field in the binding, so that we warn about lookups
7028 struct c_binding
*b
= I_SYMBOL_BINDING (DECL_NAME (value
));
7031 /* If the in_struct field is not yet set, push it on a list
7032 to be cleared when this struct is finished. */
7035 struct_parse_info
->fields
.safe_push (b
);
7044 /* Subroutine of detect_field_duplicates: return whether X and Y,
7045 which are both fields in the same struct, have duplicate field
7049 is_duplicate_field (tree x
, tree y
)
7051 if (DECL_NAME (x
) != NULL_TREE
&& DECL_NAME (x
) == DECL_NAME (y
))
7054 /* When using -fplan9-extensions, an anonymous field whose name is a
7055 typedef can duplicate a field name. */
7056 if (flag_plan9_extensions
7057 && (DECL_NAME (x
) == NULL_TREE
|| DECL_NAME (y
) == NULL_TREE
))
7059 tree xt
, xn
, yt
, yn
;
7062 if (DECL_NAME (x
) != NULL_TREE
)
7064 else if ((TREE_CODE (xt
) == RECORD_TYPE
|| TREE_CODE (xt
) == UNION_TYPE
)
7065 && TYPE_NAME (xt
) != NULL_TREE
7066 && TREE_CODE (TYPE_NAME (xt
)) == TYPE_DECL
)
7067 xn
= DECL_NAME (TYPE_NAME (xt
));
7072 if (DECL_NAME (y
) != NULL_TREE
)
7074 else if ((TREE_CODE (yt
) == RECORD_TYPE
|| TREE_CODE (yt
) == UNION_TYPE
)
7075 && TYPE_NAME (yt
) != NULL_TREE
7076 && TREE_CODE (TYPE_NAME (yt
)) == TYPE_DECL
)
7077 yn
= DECL_NAME (TYPE_NAME (yt
));
7081 if (xn
!= NULL_TREE
&& xn
== yn
)
7088 /* Subroutine of detect_field_duplicates: add the fields of FIELDLIST
7089 to HTAB, giving errors for any duplicates. */
7092 detect_field_duplicates_hash (tree fieldlist
,
7093 hash_table
<pointer_hash
<tree_node
> > *htab
)
7098 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
7099 if ((y
= DECL_NAME (x
)) != 0)
7101 slot
= htab
->find_slot (y
, INSERT
);
7104 error ("duplicate member %q+D", x
);
7105 DECL_NAME (x
) = NULL_TREE
;
7109 else if (TREE_CODE (TREE_TYPE (x
)) == RECORD_TYPE
7110 || TREE_CODE (TREE_TYPE (x
)) == UNION_TYPE
)
7112 detect_field_duplicates_hash (TYPE_FIELDS (TREE_TYPE (x
)), htab
);
7114 /* When using -fplan9-extensions, an anonymous field whose
7115 name is a typedef can duplicate a field name. */
7116 if (flag_plan9_extensions
7117 && TYPE_NAME (TREE_TYPE (x
)) != NULL_TREE
7118 && TREE_CODE (TYPE_NAME (TREE_TYPE (x
))) == TYPE_DECL
)
7120 tree xn
= DECL_NAME (TYPE_NAME (TREE_TYPE (x
)));
7121 slot
= htab
->find_slot (xn
, INSERT
);
7123 error ("duplicate member %q+D", TYPE_NAME (TREE_TYPE (x
)));
7129 /* Generate an error for any duplicate field names in FIELDLIST. Munge
7130 the list such that this does not present a problem later. */
7133 detect_field_duplicates (tree fieldlist
)
7138 /* If the struct is the list of instance variables of an Objective-C
7139 class, then we need to check all the instance variables of
7140 superclasses when checking for duplicates (since you can't have
7141 an instance variable in a subclass with the same name as an
7142 instance variable in a superclass). We pass on this job to the
7143 Objective-C compiler. objc_detect_field_duplicates() will return
7144 false if we are not checking the list of instance variables and
7145 the C frontend should proceed with the standard field duplicate
7146 checks. If we are checking the list of instance variables, the
7147 ObjC frontend will do the check, emit the errors if needed, and
7148 then return true. */
7149 if (c_dialect_objc ())
7150 if (objc_detect_field_duplicates (false))
7153 /* First, see if there are more than "a few" fields.
7154 This is trivially true if there are zero or one fields. */
7155 if (!fieldlist
|| !DECL_CHAIN (fieldlist
))
7160 if (DECL_NAME (x
) == NULL_TREE
7161 && (TREE_CODE (TREE_TYPE (x
)) == RECORD_TYPE
7162 || TREE_CODE (TREE_TYPE (x
)) == UNION_TYPE
))
7165 } while (timeout
> 0 && x
);
7167 /* If there were "few" fields and no anonymous structures or unions,
7168 avoid the overhead of allocating a hash table. Instead just do
7169 the nested traversal thing. */
7172 for (x
= DECL_CHAIN (fieldlist
); x
; x
= DECL_CHAIN (x
))
7173 /* When using -fplan9-extensions, we can have duplicates
7174 between typedef names and fields. */
7176 || (flag_plan9_extensions
7177 && DECL_NAME (x
) == NULL_TREE
7178 && (TREE_CODE (TREE_TYPE (x
)) == RECORD_TYPE
7179 || TREE_CODE (TREE_TYPE (x
)) == UNION_TYPE
)
7180 && TYPE_NAME (TREE_TYPE (x
)) != NULL_TREE
7181 && TREE_CODE (TYPE_NAME (TREE_TYPE (x
))) == TYPE_DECL
))
7183 for (y
= fieldlist
; y
!= x
; y
= TREE_CHAIN (y
))
7184 if (is_duplicate_field (y
, x
))
7186 error ("duplicate member %q+D", x
);
7187 DECL_NAME (x
) = NULL_TREE
;
7193 hash_table
<pointer_hash
<tree_node
> > htab (37);
7194 detect_field_duplicates_hash (fieldlist
, &htab
);
7198 /* Finish up struct info used by -Wc++-compat. */
7201 warn_cxx_compat_finish_struct (tree fieldlist
)
7205 struct c_binding
*b
;
7207 /* Set the C_TYPE_DEFINED_IN_STRUCT flag for each type defined in
7208 the current struct. We do this now at the end of the struct
7209 because the flag is used to issue visibility warnings, and we
7210 only want to issue those warnings if the type is referenced
7211 outside of the struct declaration. */
7212 FOR_EACH_VEC_ELT (struct_parse_info
->struct_types
, ix
, x
)
7213 C_TYPE_DEFINED_IN_STRUCT (x
) = 1;
7215 /* The TYPEDEFS_SEEN field of STRUCT_PARSE_INFO is a list of
7216 typedefs used when declaring fields in this struct. If the name
7217 of any of the fields is also a typedef name then the struct would
7218 not parse in C++, because the C++ lookup rules say that the
7219 typedef name would be looked up in the context of the struct, and
7220 would thus be the field rather than the typedef. */
7221 if (!struct_parse_info
->typedefs_seen
.is_empty ()
7222 && fieldlist
!= NULL_TREE
)
7224 /* Use a pointer_set using the name of the typedef. We can use
7225 a pointer_set because identifiers are interned. */
7226 struct pointer_set_t
*tset
= pointer_set_create ();
7228 FOR_EACH_VEC_ELT (struct_parse_info
->typedefs_seen
, ix
, x
)
7229 pointer_set_insert (tset
, DECL_NAME (x
));
7231 for (x
= fieldlist
; x
!= NULL_TREE
; x
= DECL_CHAIN (x
))
7233 if (DECL_NAME (x
) != NULL_TREE
7234 && pointer_set_contains (tset
, DECL_NAME (x
)))
7236 warning_at (DECL_SOURCE_LOCATION (x
), OPT_Wc___compat
,
7237 ("using %qD as both field and typedef name is "
7240 /* FIXME: It would be nice to report the location where
7241 the typedef name is used. */
7245 pointer_set_destroy (tset
);
7248 /* For each field which has a binding and which was not defined in
7249 an enclosing struct, clear the in_struct field. */
7250 FOR_EACH_VEC_ELT (struct_parse_info
->fields
, ix
, b
)
7254 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
7255 LOC is the location of the RECORD_TYPE or UNION_TYPE's definition.
7256 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
7257 ATTRIBUTES are attributes to be applied to the structure.
7259 ENCLOSING_STRUCT_PARSE_INFO is the value of STRUCT_PARSE_INFO when
7260 the struct was started. */
7263 finish_struct (location_t loc
, tree t
, tree fieldlist
, tree attributes
,
7264 struct c_struct_parse_info
*enclosing_struct_parse_info
)
7267 bool toplevel
= file_scope
== current_scope
;
7268 int saw_named_field
;
7270 /* If this type was previously laid out as a forward reference,
7271 make sure we lay it out again. */
7275 decl_attributes (&t
, attributes
, (int) ATTR_FLAG_TYPE_IN_PLACE
);
7279 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
7281 if (DECL_NAME (x
) != 0)
7284 && (TREE_CODE (TREE_TYPE (x
)) == RECORD_TYPE
7285 || TREE_CODE (TREE_TYPE (x
)) == UNION_TYPE
))
7291 if (TREE_CODE (t
) == UNION_TYPE
)
7294 pedwarn (loc
, OPT_Wpedantic
, "union has no named members");
7296 pedwarn (loc
, OPT_Wpedantic
, "union has no members");
7301 pedwarn (loc
, OPT_Wpedantic
, "struct has no named members");
7303 pedwarn (loc
, OPT_Wpedantic
, "struct has no members");
7308 /* Install struct as DECL_CONTEXT of each field decl.
7309 Also process specified field sizes, found in the DECL_INITIAL,
7310 storing 0 there after the type has been changed to precision equal
7311 to its width, rather than the precision of the specified standard
7312 type. (Correct layout requires the original type to have been preserved
7315 saw_named_field
= 0;
7316 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
7318 if (TREE_TYPE (x
) == error_mark_node
)
7321 DECL_CONTEXT (x
) = t
;
7323 /* If any field is const, the structure type is pseudo-const. */
7324 if (TREE_READONLY (x
))
7325 C_TYPE_FIELDS_READONLY (t
) = 1;
7328 /* A field that is pseudo-const makes the structure likewise. */
7329 tree t1
= strip_array_types (TREE_TYPE (x
));
7330 if ((TREE_CODE (t1
) == RECORD_TYPE
|| TREE_CODE (t1
) == UNION_TYPE
)
7331 && C_TYPE_FIELDS_READONLY (t1
))
7332 C_TYPE_FIELDS_READONLY (t
) = 1;
7335 /* Any field that is volatile means variables of this type must be
7336 treated in some ways as volatile. */
7337 if (TREE_THIS_VOLATILE (x
))
7338 C_TYPE_FIELDS_VOLATILE (t
) = 1;
7340 /* Any field of nominal variable size implies structure is too. */
7341 if (C_DECL_VARIABLE_SIZE (x
))
7342 C_TYPE_VARIABLE_SIZE (t
) = 1;
7344 if (DECL_INITIAL (x
))
7346 unsigned HOST_WIDE_INT width
= tree_to_uhwi (DECL_INITIAL (x
));
7347 DECL_SIZE (x
) = bitsize_int (width
);
7348 DECL_BIT_FIELD (x
) = 1;
7349 SET_DECL_C_BIT_FIELD (x
);
7353 && (DECL_BIT_FIELD (x
)
7354 || TYPE_ALIGN (TREE_TYPE (x
)) > BITS_PER_UNIT
))
7355 DECL_PACKED (x
) = 1;
7357 /* Detect flexible array member in an invalid context. */
7358 if (TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
7359 && TYPE_SIZE (TREE_TYPE (x
)) == NULL_TREE
7360 && TYPE_DOMAIN (TREE_TYPE (x
)) != NULL_TREE
7361 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x
))) == NULL_TREE
)
7363 if (TREE_CODE (t
) == UNION_TYPE
)
7365 error_at (DECL_SOURCE_LOCATION (x
),
7366 "flexible array member in union");
7367 TREE_TYPE (x
) = error_mark_node
;
7369 else if (DECL_CHAIN (x
) != NULL_TREE
)
7371 error_at (DECL_SOURCE_LOCATION (x
),
7372 "flexible array member not at end of struct");
7373 TREE_TYPE (x
) = error_mark_node
;
7375 else if (!saw_named_field
)
7377 error_at (DECL_SOURCE_LOCATION (x
),
7378 "flexible array member in otherwise empty struct");
7379 TREE_TYPE (x
) = error_mark_node
;
7383 if (pedantic
&& TREE_CODE (t
) == RECORD_TYPE
7384 && flexible_array_type_p (TREE_TYPE (x
)))
7385 pedwarn (DECL_SOURCE_LOCATION (x
), OPT_Wpedantic
,
7386 "invalid use of structure with flexible array member");
7389 || TREE_CODE (TREE_TYPE (x
)) == RECORD_TYPE
7390 || TREE_CODE (TREE_TYPE (x
)) == UNION_TYPE
)
7391 saw_named_field
= 1;
7394 detect_field_duplicates (fieldlist
);
7396 /* Now we have the nearly final fieldlist. Record it,
7397 then lay out the structure or union (including the fields). */
7399 TYPE_FIELDS (t
) = fieldlist
;
7403 if (TYPE_SIZE_UNIT (t
)
7404 && TREE_CODE (TYPE_SIZE_UNIT (t
)) == INTEGER_CST
7405 && !TREE_OVERFLOW (TYPE_SIZE_UNIT (t
))
7406 && !valid_constant_size_p (TYPE_SIZE_UNIT (t
)))
7407 error ("type %qT is too large", t
);
7409 /* Give bit-fields their proper types. */
7411 tree
*fieldlistp
= &fieldlist
;
7413 if (TREE_CODE (*fieldlistp
) == FIELD_DECL
&& DECL_INITIAL (*fieldlistp
)
7414 && TREE_TYPE (*fieldlistp
) != error_mark_node
)
7416 unsigned HOST_WIDE_INT width
7417 = tree_to_uhwi (DECL_INITIAL (*fieldlistp
));
7418 tree type
= TREE_TYPE (*fieldlistp
);
7419 if (width
!= TYPE_PRECISION (type
))
7421 TREE_TYPE (*fieldlistp
)
7422 = c_build_bitfield_integer_type (width
, TYPE_UNSIGNED (type
));
7423 DECL_MODE (*fieldlistp
) = TYPE_MODE (TREE_TYPE (*fieldlistp
));
7425 DECL_INITIAL (*fieldlistp
) = 0;
7428 fieldlistp
= &DECL_CHAIN (*fieldlistp
);
7431 /* Now we have the truly final field list.
7432 Store it in this type and in the variants. */
7434 TYPE_FIELDS (t
) = fieldlist
;
7436 /* If there are lots of fields, sort so we can look through them fast.
7437 We arbitrarily consider 16 or more elts to be "a lot". */
7442 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
7444 if (len
> 15 || DECL_NAME (x
) == NULL
)
7452 struct lang_type
*space
;
7453 struct sorted_fields_type
*space2
;
7455 len
+= list_length (x
);
7457 /* Use the same allocation policy here that make_node uses, to
7458 ensure that this lives as long as the rest of the struct decl.
7459 All decls in an inline function need to be saved. */
7461 space
= ggc_cleared_alloc
<struct lang_type
> ();
7462 space2
= (sorted_fields_type
*) ggc_internal_alloc
7463 (sizeof (struct sorted_fields_type
) + len
* sizeof (tree
));
7467 field_array
= &space2
->elts
[0];
7468 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
7470 field_array
[len
++] = x
;
7472 /* If there is anonymous struct or union, break out of the loop. */
7473 if (DECL_NAME (x
) == NULL
)
7476 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
7479 TYPE_LANG_SPECIFIC (t
) = space
;
7480 TYPE_LANG_SPECIFIC (t
)->s
->len
= len
;
7481 field_array
= TYPE_LANG_SPECIFIC (t
)->s
->elts
;
7482 qsort (field_array
, len
, sizeof (tree
), field_decl_cmp
);
7487 for (x
= TYPE_MAIN_VARIANT (t
); x
; x
= TYPE_NEXT_VARIANT (x
))
7489 TYPE_FIELDS (x
) = TYPE_FIELDS (t
);
7490 TYPE_LANG_SPECIFIC (x
) = TYPE_LANG_SPECIFIC (t
);
7491 C_TYPE_FIELDS_READONLY (x
) = C_TYPE_FIELDS_READONLY (t
);
7492 C_TYPE_FIELDS_VOLATILE (x
) = C_TYPE_FIELDS_VOLATILE (t
);
7493 C_TYPE_VARIABLE_SIZE (x
) = C_TYPE_VARIABLE_SIZE (t
);
7496 /* If this was supposed to be a transparent union, but we can't
7497 make it one, warn and turn off the flag. */
7498 if (TREE_CODE (t
) == UNION_TYPE
7499 && TYPE_TRANSPARENT_AGGR (t
)
7500 && (!TYPE_FIELDS (t
) || TYPE_MODE (t
) != DECL_MODE (TYPE_FIELDS (t
))))
7502 TYPE_TRANSPARENT_AGGR (t
) = 0;
7503 warning_at (loc
, 0, "union cannot be made transparent");
7506 /* If this structure or union completes the type of any previous
7507 variable declaration, lay it out and output its rtl. */
7508 for (x
= C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t
));
7512 tree decl
= TREE_VALUE (x
);
7513 if (TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
)
7514 layout_array_type (TREE_TYPE (decl
));
7515 if (TREE_CODE (decl
) != TYPE_DECL
)
7517 layout_decl (decl
, 0);
7518 if (c_dialect_objc ())
7519 objc_check_decl (decl
);
7520 rest_of_decl_compilation (decl
, toplevel
, 0);
7523 C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t
)) = 0;
7525 /* Update type location to the one of the definition, instead of e.g.
7526 a forward declaration. */
7527 if (TYPE_STUB_DECL (t
))
7528 DECL_SOURCE_LOCATION (TYPE_STUB_DECL (t
)) = loc
;
7530 /* Finish debugging output for this type. */
7531 rest_of_type_compilation (t
, toplevel
);
7533 /* If we're inside a function proper, i.e. not file-scope and not still
7534 parsing parameters, then arrange for the size of a variable sized type
7536 if (building_stmt_list_p () && variably_modified_type_p (t
, NULL_TREE
))
7537 add_stmt (build_stmt (loc
,
7538 DECL_EXPR
, build_decl (loc
, TYPE_DECL
, NULL
, t
)));
7540 if (warn_cxx_compat
)
7541 warn_cxx_compat_finish_struct (fieldlist
);
7543 struct_parse_info
->struct_types
.release ();
7544 struct_parse_info
->fields
.release ();
7545 struct_parse_info
->typedefs_seen
.release ();
7546 XDELETE (struct_parse_info
);
7548 struct_parse_info
= enclosing_struct_parse_info
;
7550 /* If this struct is defined inside a struct, add it to
7553 && struct_parse_info
!= NULL
7554 && !in_sizeof
&& !in_typeof
&& !in_alignof
)
7555 struct_parse_info
->struct_types
.safe_push (t
);
7560 /* Lay out the type T, and its element type, and so on. */
7563 layout_array_type (tree t
)
7565 if (TREE_CODE (TREE_TYPE (t
)) == ARRAY_TYPE
)
7566 layout_array_type (TREE_TYPE (t
));
7570 /* Begin compiling the definition of an enumeration type.
7571 NAME is its name (or null if anonymous).
7572 LOC is the enum's location.
7573 Returns the type object, as yet incomplete.
7574 Also records info about it so that build_enumerator
7575 may be used to declare the individual values as they are read. */
7578 start_enum (location_t loc
, struct c_enum_contents
*the_enum
, tree name
)
7580 tree enumtype
= NULL_TREE
;
7581 location_t enumloc
= UNKNOWN_LOCATION
;
7583 /* If this is the real definition for a previous forward reference,
7584 fill in the contents in the same object that used to be the
7585 forward reference. */
7587 if (name
!= NULL_TREE
)
7588 enumtype
= lookup_tag (ENUMERAL_TYPE
, name
, 1, &enumloc
);
7590 if (enumtype
== 0 || TREE_CODE (enumtype
) != ENUMERAL_TYPE
)
7592 enumtype
= make_node (ENUMERAL_TYPE
);
7593 pushtag (loc
, name
, enumtype
);
7596 if (C_TYPE_BEING_DEFINED (enumtype
))
7597 error_at (loc
, "nested redefinition of %<enum %E%>", name
);
7599 C_TYPE_BEING_DEFINED (enumtype
) = 1;
7601 if (TYPE_VALUES (enumtype
) != 0)
7603 /* This enum is a named one that has been declared already. */
7604 error_at (loc
, "redeclaration of %<enum %E%>", name
);
7605 if (enumloc
!= UNKNOWN_LOCATION
)
7606 inform (enumloc
, "originally defined here");
7608 /* Completely replace its old definition.
7609 The old enumerators remain defined, however. */
7610 TYPE_VALUES (enumtype
) = 0;
7613 the_enum
->enum_next_value
= integer_zero_node
;
7614 the_enum
->enum_overflow
= 0;
7616 if (flag_short_enums
)
7617 TYPE_PACKED (enumtype
) = 1;
7619 /* FIXME: This will issue a warning for a use of a type defined
7620 within sizeof in a statement expr. This is not terribly serious
7621 as C++ doesn't permit statement exprs within sizeof anyhow. */
7622 if (warn_cxx_compat
&& (in_sizeof
|| in_typeof
|| in_alignof
))
7623 warning_at (loc
, OPT_Wc___compat
,
7624 "defining type in %qs expression is invalid in C++",
7627 : (in_typeof
? "typeof" : "alignof")));
7632 /* After processing and defining all the values of an enumeration type,
7633 install their decls in the enumeration type and finish it off.
7634 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
7635 and ATTRIBUTES are the specified attributes.
7636 Returns ENUMTYPE. */
7639 finish_enum (tree enumtype
, tree values
, tree attributes
)
7642 tree minnode
= 0, maxnode
= 0;
7645 bool toplevel
= (file_scope
== current_scope
);
7646 struct lang_type
*lt
;
7648 decl_attributes (&enumtype
, attributes
, (int) ATTR_FLAG_TYPE_IN_PLACE
);
7650 /* Calculate the maximum value of any enumerator in this type. */
7652 if (values
== error_mark_node
)
7653 minnode
= maxnode
= integer_zero_node
;
7656 minnode
= maxnode
= TREE_VALUE (values
);
7657 for (pair
= TREE_CHAIN (values
); pair
; pair
= TREE_CHAIN (pair
))
7659 tree value
= TREE_VALUE (pair
);
7660 if (tree_int_cst_lt (maxnode
, value
))
7662 if (tree_int_cst_lt (value
, minnode
))
7667 /* Construct the final type of this enumeration. It is the same
7668 as one of the integral types - the narrowest one that fits, except
7669 that normally we only go as narrow as int - and signed iff any of
7670 the values are negative. */
7671 sign
= (tree_int_cst_sgn (minnode
) >= 0) ? UNSIGNED
: SIGNED
;
7672 precision
= MAX (tree_int_cst_min_precision (minnode
, sign
),
7673 tree_int_cst_min_precision (maxnode
, sign
));
7675 if (TYPE_PACKED (enumtype
) || precision
> TYPE_PRECISION (integer_type_node
))
7677 tem
= c_common_type_for_size (precision
, sign
== UNSIGNED
? 1 : 0);
7680 warning (0, "enumeration values exceed range of largest integer");
7681 tem
= long_long_integer_type_node
;
7685 tem
= sign
== UNSIGNED
? unsigned_type_node
: integer_type_node
;
7687 TYPE_MIN_VALUE (enumtype
) = TYPE_MIN_VALUE (tem
);
7688 TYPE_MAX_VALUE (enumtype
) = TYPE_MAX_VALUE (tem
);
7689 TYPE_UNSIGNED (enumtype
) = TYPE_UNSIGNED (tem
);
7690 TYPE_SIZE (enumtype
) = 0;
7692 /* If the precision of the type was specific with an attribute and it
7693 was too small, give an error. Otherwise, use it. */
7694 if (TYPE_PRECISION (enumtype
))
7696 if (precision
> TYPE_PRECISION (enumtype
))
7697 error ("specified mode too small for enumeral values");
7700 TYPE_PRECISION (enumtype
) = TYPE_PRECISION (tem
);
7702 layout_type (enumtype
);
7704 if (values
!= error_mark_node
)
7706 /* Change the type of the enumerators to be the enum type. We
7707 need to do this irrespective of the size of the enum, for
7708 proper type checking. Replace the DECL_INITIALs of the
7709 enumerators, and the value slots of the list, with copies
7710 that have the enum type; they cannot be modified in place
7711 because they may be shared (e.g. integer_zero_node) Finally,
7712 change the purpose slots to point to the names of the decls. */
7713 for (pair
= values
; pair
; pair
= TREE_CHAIN (pair
))
7715 tree enu
= TREE_PURPOSE (pair
);
7716 tree ini
= DECL_INITIAL (enu
);
7718 TREE_TYPE (enu
) = enumtype
;
7720 /* The ISO C Standard mandates enumerators to have type int,
7721 even though the underlying type of an enum type is
7722 unspecified. However, GCC allows enumerators of any
7723 integer type as an extensions. build_enumerator()
7724 converts any enumerators that fit in an int to type int,
7725 to avoid promotions to unsigned types when comparing
7726 integers with enumerators that fit in the int range.
7727 When -pedantic is given, build_enumerator() would have
7728 already warned about those that don't fit. Here we
7729 convert the rest to the enumerator type. */
7730 if (TREE_TYPE (ini
) != integer_type_node
)
7731 ini
= convert (enumtype
, ini
);
7733 DECL_INITIAL (enu
) = ini
;
7734 TREE_PURPOSE (pair
) = DECL_NAME (enu
);
7735 TREE_VALUE (pair
) = ini
;
7738 TYPE_VALUES (enumtype
) = values
;
7741 /* Record the min/max values so that we can warn about bit-field
7742 enumerations that are too small for the values. */
7743 lt
= ggc_cleared_alloc
<struct lang_type
> ();
7744 lt
->enum_min
= minnode
;
7745 lt
->enum_max
= maxnode
;
7746 TYPE_LANG_SPECIFIC (enumtype
) = lt
;
7748 /* Fix up all variant types of this enum type. */
7749 for (tem
= TYPE_MAIN_VARIANT (enumtype
); tem
; tem
= TYPE_NEXT_VARIANT (tem
))
7751 if (tem
== enumtype
)
7753 TYPE_VALUES (tem
) = TYPE_VALUES (enumtype
);
7754 TYPE_MIN_VALUE (tem
) = TYPE_MIN_VALUE (enumtype
);
7755 TYPE_MAX_VALUE (tem
) = TYPE_MAX_VALUE (enumtype
);
7756 TYPE_SIZE (tem
) = TYPE_SIZE (enumtype
);
7757 TYPE_SIZE_UNIT (tem
) = TYPE_SIZE_UNIT (enumtype
);
7758 SET_TYPE_MODE (tem
, TYPE_MODE (enumtype
));
7759 TYPE_PRECISION (tem
) = TYPE_PRECISION (enumtype
);
7760 TYPE_ALIGN (tem
) = TYPE_ALIGN (enumtype
);
7761 TYPE_USER_ALIGN (tem
) = TYPE_USER_ALIGN (enumtype
);
7762 TYPE_UNSIGNED (tem
) = TYPE_UNSIGNED (enumtype
);
7763 TYPE_LANG_SPECIFIC (tem
) = TYPE_LANG_SPECIFIC (enumtype
);
7766 /* Finish debugging output for this type. */
7767 rest_of_type_compilation (enumtype
, toplevel
);
7769 /* If this enum is defined inside a struct, add it to
7772 && struct_parse_info
!= NULL
7773 && !in_sizeof
&& !in_typeof
&& !in_alignof
)
7774 struct_parse_info
->struct_types
.safe_push (enumtype
);
7779 /* Build and install a CONST_DECL for one value of the
7780 current enumeration type (one that was begun with start_enum).
7781 DECL_LOC is the location of the enumerator.
7782 LOC is the location of the '=' operator if any, DECL_LOC otherwise.
7783 Return a tree-list containing the CONST_DECL and its value.
7784 Assignment of sequential values by default is handled here. */
7787 build_enumerator (location_t decl_loc
, location_t loc
,
7788 struct c_enum_contents
*the_enum
, tree name
, tree value
)
7792 /* Validate and default VALUE. */
7796 /* Don't issue more errors for error_mark_node (i.e. an
7797 undeclared identifier) - just ignore the value expression. */
7798 if (value
== error_mark_node
)
7800 else if (!INTEGRAL_TYPE_P (TREE_TYPE (value
)))
7802 error_at (loc
, "enumerator value for %qE is not an integer constant",
7808 if (TREE_CODE (value
) != INTEGER_CST
)
7810 value
= c_fully_fold (value
, false, NULL
);
7811 if (TREE_CODE (value
) == INTEGER_CST
)
7812 pedwarn (loc
, OPT_Wpedantic
,
7813 "enumerator value for %qE is not an integer "
7814 "constant expression", name
);
7816 if (TREE_CODE (value
) != INTEGER_CST
)
7818 error ("enumerator value for %qE is not an integer constant",
7824 value
= default_conversion (value
);
7825 constant_expression_warning (value
);
7830 /* Default based on previous value. */
7831 /* It should no longer be possible to have NON_LVALUE_EXPR
7835 value
= the_enum
->enum_next_value
;
7836 if (the_enum
->enum_overflow
)
7837 error_at (loc
, "overflow in enumeration values");
7839 /* Even though the underlying type of an enum is unspecified, the
7840 type of enumeration constants is explicitly defined as int
7841 (6.4.4.3/2 in the C99 Standard). GCC allows any integer type as
7843 else if (!int_fits_type_p (value
, integer_type_node
))
7844 pedwarn (loc
, OPT_Wpedantic
,
7845 "ISO C restricts enumerator values to range of %<int%>");
7847 /* The ISO C Standard mandates enumerators to have type int, even
7848 though the underlying type of an enum type is unspecified.
7849 However, GCC allows enumerators of any integer type as an
7850 extensions. Here we convert any enumerators that fit in an int
7851 to type int, to avoid promotions to unsigned types when comparing
7852 integers with enumerators that fit in the int range. When
7853 -pedantic is given, we would have already warned about those that
7854 don't fit. We have to do this here rather than in finish_enum
7855 because this value may be used to define more enumerators. */
7856 if (int_fits_type_p (value
, integer_type_node
))
7857 value
= convert (integer_type_node
, value
);
7859 /* Set basis for default for next value. */
7860 the_enum
->enum_next_value
7861 = build_binary_op (EXPR_LOC_OR_LOC (value
, input_location
),
7862 PLUS_EXPR
, value
, integer_one_node
, 0);
7863 the_enum
->enum_overflow
= tree_int_cst_lt (the_enum
->enum_next_value
, value
);
7865 /* Now create a declaration for the enum value name. */
7867 type
= TREE_TYPE (value
);
7868 type
= c_common_type_for_size (MAX (TYPE_PRECISION (type
),
7869 TYPE_PRECISION (integer_type_node
)),
7870 (TYPE_PRECISION (type
)
7871 >= TYPE_PRECISION (integer_type_node
)
7872 && TYPE_UNSIGNED (type
)));
7874 decl
= build_decl (decl_loc
, CONST_DECL
, name
, type
);
7875 DECL_INITIAL (decl
) = convert (type
, value
);
7878 return tree_cons (decl
, value
, NULL_TREE
);
7882 /* Create the FUNCTION_DECL for a function definition.
7883 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
7884 the declaration; they describe the function's name and the type it returns,
7885 but twisted together in a fashion that parallels the syntax of C.
7887 This function creates a binding context for the function body
7888 as well as setting up the FUNCTION_DECL in current_function_decl.
7890 Returns 1 on success. If the DECLARATOR is not suitable for a function
7891 (it defines a datum instead), we return 0, which tells
7892 yyparse to report a parse error. */
7895 start_function (struct c_declspecs
*declspecs
, struct c_declarator
*declarator
,
7898 tree decl1
, old_decl
;
7899 tree restype
, resdecl
;
7902 current_function_returns_value
= 0; /* Assume, until we see it does. */
7903 current_function_returns_null
= 0;
7904 current_function_returns_abnormally
= 0;
7905 warn_about_return_type
= 0;
7906 c_switch_stack
= NULL
;
7908 /* Indicate no valid break/continue context by setting these variables
7909 to some non-null, non-label value. We'll notice and emit the proper
7910 error message in c_finish_bc_stmt. */
7911 c_break_label
= c_cont_label
= size_zero_node
;
7913 decl1
= grokdeclarator (declarator
, declspecs
, FUNCDEF
, true, NULL
,
7914 &attributes
, NULL
, NULL
, DEPRECATED_NORMAL
);
7916 /* If the declarator is not suitable for a function definition,
7917 cause a syntax error. */
7919 || TREE_CODE (decl1
) != FUNCTION_DECL
)
7922 loc
= DECL_SOURCE_LOCATION (decl1
);
7924 c_decl_attributes (&decl1
, attributes
, 0);
7926 if (DECL_DECLARED_INLINE_P (decl1
)
7927 && DECL_UNINLINABLE (decl1
)
7928 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1
)))
7929 warning_at (loc
, OPT_Wattributes
,
7930 "inline function %qD given attribute noinline",
7933 /* Handle gnu_inline attribute. */
7934 if (declspecs
->inline_p
7935 && !flag_gnu89_inline
7936 && TREE_CODE (decl1
) == FUNCTION_DECL
7937 && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl1
))
7938 || current_function_decl
))
7940 if (declspecs
->storage_class
!= csc_static
)
7941 DECL_EXTERNAL (decl1
) = !DECL_EXTERNAL (decl1
);
7944 announce_function (decl1
);
7946 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1
))))
7948 error_at (loc
, "return type is an incomplete type");
7949 /* Make it return void instead. */
7951 = build_function_type (void_type_node
,
7952 TYPE_ARG_TYPES (TREE_TYPE (decl1
)));
7955 if (warn_about_return_type
)
7956 pedwarn_c99 (loc
, flag_isoc99
? 0
7957 : (warn_return_type
? OPT_Wreturn_type
: OPT_Wimplicit_int
),
7958 "return type defaults to %<int%>");
7960 /* Make the init_value nonzero so pushdecl knows this is not tentative.
7961 error_mark_node is replaced below (in pop_scope) with the BLOCK. */
7962 DECL_INITIAL (decl1
) = error_mark_node
;
7964 /* A nested function is not global. */
7965 if (current_function_decl
!= 0)
7966 TREE_PUBLIC (decl1
) = 0;
7968 /* If this definition isn't a prototype and we had a prototype declaration
7969 before, copy the arg type info from that prototype. */
7970 old_decl
= lookup_name_in_scope (DECL_NAME (decl1
), current_scope
);
7971 if (old_decl
&& TREE_CODE (old_decl
) != FUNCTION_DECL
)
7973 current_function_prototype_locus
= UNKNOWN_LOCATION
;
7974 current_function_prototype_built_in
= false;
7975 current_function_prototype_arg_types
= NULL_TREE
;
7976 if (!prototype_p (TREE_TYPE (decl1
)))
7978 if (old_decl
!= 0 && TREE_CODE (TREE_TYPE (old_decl
)) == FUNCTION_TYPE
7979 && comptypes (TREE_TYPE (TREE_TYPE (decl1
)),
7980 TREE_TYPE (TREE_TYPE (old_decl
))))
7982 TREE_TYPE (decl1
) = composite_type (TREE_TYPE (old_decl
),
7984 current_function_prototype_locus
= DECL_SOURCE_LOCATION (old_decl
);
7985 current_function_prototype_built_in
7986 = C_DECL_BUILTIN_PROTOTYPE (old_decl
);
7987 current_function_prototype_arg_types
7988 = TYPE_ARG_TYPES (TREE_TYPE (decl1
));
7990 if (TREE_PUBLIC (decl1
))
7992 /* If there is an external prototype declaration of this
7993 function, record its location but do not copy information
7994 to this decl. This may be an invisible declaration
7995 (built-in or in a scope which has finished) or simply
7996 have more refined argument types than any declaration
7998 struct c_binding
*b
;
7999 for (b
= I_SYMBOL_BINDING (DECL_NAME (decl1
)); b
; b
= b
->shadowed
)
8000 if (B_IN_SCOPE (b
, external_scope
))
8004 tree ext_decl
, ext_type
;
8006 ext_type
= b
->u
.type
? b
->u
.type
: TREE_TYPE (ext_decl
);
8007 if (TREE_CODE (ext_type
) == FUNCTION_TYPE
8008 && comptypes (TREE_TYPE (TREE_TYPE (decl1
)),
8009 TREE_TYPE (ext_type
)))
8011 current_function_prototype_locus
8012 = DECL_SOURCE_LOCATION (ext_decl
);
8013 current_function_prototype_built_in
8014 = C_DECL_BUILTIN_PROTOTYPE (ext_decl
);
8015 current_function_prototype_arg_types
8016 = TYPE_ARG_TYPES (ext_type
);
8022 /* Optionally warn of old-fashioned def with no previous prototype. */
8023 if (warn_strict_prototypes
8024 && old_decl
!= error_mark_node
8025 && !prototype_p (TREE_TYPE (decl1
))
8026 && C_DECL_ISNT_PROTOTYPE (old_decl
))
8027 warning_at (loc
, OPT_Wstrict_prototypes
,
8028 "function declaration isn%'t a prototype");
8029 /* Optionally warn of any global def with no previous prototype. */
8030 else if (warn_missing_prototypes
8031 && old_decl
!= error_mark_node
8032 && TREE_PUBLIC (decl1
)
8033 && !MAIN_NAME_P (DECL_NAME (decl1
))
8034 && C_DECL_ISNT_PROTOTYPE (old_decl
)
8035 && !DECL_DECLARED_INLINE_P (decl1
))
8036 warning_at (loc
, OPT_Wmissing_prototypes
,
8037 "no previous prototype for %qD", decl1
);
8038 /* Optionally warn of any def with no previous prototype
8039 if the function has already been used. */
8040 else if (warn_missing_prototypes
8042 && old_decl
!= error_mark_node
8043 && TREE_USED (old_decl
)
8044 && !prototype_p (TREE_TYPE (old_decl
)))
8045 warning_at (loc
, OPT_Wmissing_prototypes
,
8046 "%qD was used with no prototype before its definition", decl1
);
8047 /* Optionally warn of any global def with no previous declaration. */
8048 else if (warn_missing_declarations
8049 && TREE_PUBLIC (decl1
)
8051 && !MAIN_NAME_P (DECL_NAME (decl1
)))
8052 warning_at (loc
, OPT_Wmissing_declarations
,
8053 "no previous declaration for %qD",
8055 /* Optionally warn of any def with no previous declaration
8056 if the function has already been used. */
8057 else if (warn_missing_declarations
8059 && old_decl
!= error_mark_node
8060 && TREE_USED (old_decl
)
8061 && C_DECL_IMPLICIT (old_decl
))
8062 warning_at (loc
, OPT_Wmissing_declarations
,
8063 "%qD was used with no declaration before its definition", decl1
);
8065 /* This function exists in static storage.
8066 (This does not mean `static' in the C sense!) */
8067 TREE_STATIC (decl1
) = 1;
8069 /* This is the earliest point at which we might know the assembler
8070 name of the function. Thus, if it's set before this, die horribly. */
8071 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl1
));
8073 /* If #pragma weak was used, mark the decl weak now. */
8074 if (current_scope
== file_scope
)
8075 maybe_apply_pragma_weak (decl1
);
8077 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
8078 if (warn_main
&& MAIN_NAME_P (DECL_NAME (decl1
)))
8080 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1
)))
8081 != integer_type_node
)
8082 pedwarn (loc
, OPT_Wmain
, "return type of %qD is not %<int%>", decl1
);
8083 else if (TYPE_ATOMIC (TREE_TYPE (TREE_TYPE (decl1
))))
8084 pedwarn (loc
, OPT_Wmain
, "%<_Atomic%>-qualified return type of %qD",
8087 check_main_parameter_types (decl1
);
8089 if (!TREE_PUBLIC (decl1
))
8090 pedwarn (loc
, OPT_Wmain
,
8091 "%qD is normally a non-static function", decl1
);
8094 /* Record the decl so that the function name is defined.
8095 If we already have a decl for this name, and it is a FUNCTION_DECL,
8096 use the old decl. */
8098 current_function_decl
= pushdecl (decl1
);
8101 declare_parm_level ();
8103 restype
= TREE_TYPE (TREE_TYPE (current_function_decl
));
8104 resdecl
= build_decl (loc
, RESULT_DECL
, NULL_TREE
, restype
);
8105 DECL_ARTIFICIAL (resdecl
) = 1;
8106 DECL_IGNORED_P (resdecl
) = 1;
8107 DECL_RESULT (current_function_decl
) = resdecl
;
8109 start_fname_decls ();
8114 /* Subroutine of store_parm_decls which handles new-style function
8115 definitions (prototype format). The parms already have decls, so we
8116 need only record them as in effect and complain if any redundant
8117 old-style parm decls were written. */
8119 store_parm_decls_newstyle (tree fndecl
, const struct c_arg_info
*arg_info
)
8125 if (current_scope
->bindings
)
8127 error_at (DECL_SOURCE_LOCATION (fndecl
),
8128 "old-style parameter declarations in prototyped "
8129 "function definition");
8131 /* Get rid of the old-style declarations. */
8135 /* Don't issue this warning for nested functions, and don't issue this
8136 warning if we got here because ARG_INFO_TYPES was error_mark_node
8137 (this happens when a function definition has just an ellipsis in
8138 its parameter list). */
8139 else if (!in_system_header_at (input_location
)
8140 && !current_function_scope
8141 && arg_info
->types
!= error_mark_node
)
8142 warning_at (DECL_SOURCE_LOCATION (fndecl
), OPT_Wtraditional
,
8143 "traditional C rejects ISO C style function definitions");
8145 /* Now make all the parameter declarations visible in the function body.
8146 We can bypass most of the grunt work of pushdecl. */
8147 for (decl
= arg_info
->parms
; decl
; decl
= DECL_CHAIN (decl
))
8149 DECL_CONTEXT (decl
) = current_function_decl
;
8150 if (DECL_NAME (decl
))
8152 bind (DECL_NAME (decl
), decl
, current_scope
,
8153 /*invisible=*/false, /*nested=*/false,
8155 if (!TREE_USED (decl
))
8156 warn_if_shadowing (decl
);
8159 error_at (DECL_SOURCE_LOCATION (decl
), "parameter name omitted");
8162 /* Record the parameter list in the function declaration. */
8163 DECL_ARGUMENTS (fndecl
) = arg_info
->parms
;
8165 /* Now make all the ancillary declarations visible, likewise. */
8166 for (decl
= arg_info
->others
; decl
; decl
= DECL_CHAIN (decl
))
8168 DECL_CONTEXT (decl
) = current_function_decl
;
8169 if (DECL_NAME (decl
))
8170 bind (DECL_NAME (decl
), decl
, current_scope
,
8171 /*invisible=*/false,
8172 /*nested=*/(TREE_CODE (decl
) == FUNCTION_DECL
),
8176 /* And all the tag declarations. */
8177 FOR_EACH_VEC_SAFE_ELT_REVERSE (arg_info
->tags
, ix
, tag
)
8179 bind (tag
->id
, tag
->type
, current_scope
,
8180 /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION
);
8183 /* Subroutine of store_parm_decls which handles old-style function
8184 definitions (separate parameter list and declarations). */
8187 store_parm_decls_oldstyle (tree fndecl
, const struct c_arg_info
*arg_info
)
8189 struct c_binding
*b
;
8190 tree parm
, decl
, last
;
8191 tree parmids
= arg_info
->parms
;
8192 struct pointer_set_t
*seen_args
= pointer_set_create ();
8194 if (!in_system_header_at (input_location
))
8195 warning_at (DECL_SOURCE_LOCATION (fndecl
),
8196 OPT_Wold_style_definition
, "old-style function definition");
8198 /* Match each formal parameter name with its declaration. Save each
8199 decl in the appropriate TREE_PURPOSE slot of the parmids chain. */
8200 for (parm
= parmids
; parm
; parm
= TREE_CHAIN (parm
))
8202 if (TREE_VALUE (parm
) == 0)
8204 error_at (DECL_SOURCE_LOCATION (fndecl
),
8205 "parameter name missing from parameter list");
8206 TREE_PURPOSE (parm
) = 0;
8210 b
= I_SYMBOL_BINDING (TREE_VALUE (parm
));
8211 if (b
&& B_IN_CURRENT_SCOPE (b
))
8214 /* Skip erroneous parameters. */
8215 if (decl
== error_mark_node
)
8217 /* If we got something other than a PARM_DECL it is an error. */
8218 if (TREE_CODE (decl
) != PARM_DECL
)
8219 error_at (DECL_SOURCE_LOCATION (decl
),
8220 "%qD declared as a non-parameter", decl
);
8221 /* If the declaration is already marked, we have a duplicate
8222 name. Complain and ignore the duplicate. */
8223 else if (pointer_set_contains (seen_args
, decl
))
8225 error_at (DECL_SOURCE_LOCATION (decl
),
8226 "multiple parameters named %qD", decl
);
8227 TREE_PURPOSE (parm
) = 0;
8230 /* If the declaration says "void", complain and turn it into
8232 else if (VOID_TYPE_P (TREE_TYPE (decl
)))
8234 error_at (DECL_SOURCE_LOCATION (decl
),
8235 "parameter %qD declared with void type", decl
);
8236 TREE_TYPE (decl
) = integer_type_node
;
8237 DECL_ARG_TYPE (decl
) = integer_type_node
;
8238 layout_decl (decl
, 0);
8240 warn_if_shadowing (decl
);
8242 /* If no declaration found, default to int. */
8245 /* FIXME diagnostics: This should be the location of the argument,
8246 not the FNDECL. E.g., for an old-style declaration
8248 int f10(v) { blah; }
8250 We should use the location of the V, not the F10.
8251 Unfortunately, the V is an IDENTIFIER_NODE which has no
8252 location. In the future we need locations for c_arg_info
8255 See gcc.dg/Wshadow-3.c for an example of this problem. */
8256 decl
= build_decl (DECL_SOURCE_LOCATION (fndecl
),
8257 PARM_DECL
, TREE_VALUE (parm
), integer_type_node
);
8258 DECL_ARG_TYPE (decl
) = TREE_TYPE (decl
);
8260 warn_if_shadowing (decl
);
8263 pedwarn (DECL_SOURCE_LOCATION (decl
),
8264 0, "type of %qD defaults to %<int%>", decl
);
8266 warning_at (DECL_SOURCE_LOCATION (decl
),
8267 OPT_Wmissing_parameter_type
,
8268 "type of %qD defaults to %<int%>", decl
);
8271 TREE_PURPOSE (parm
) = decl
;
8272 pointer_set_insert (seen_args
, decl
);
8275 /* Now examine the parms chain for incomplete declarations
8276 and declarations with no corresponding names. */
8278 for (b
= current_scope
->bindings
; b
; b
= b
->prev
)
8281 if (TREE_CODE (parm
) != PARM_DECL
)
8284 if (TREE_TYPE (parm
) != error_mark_node
8285 && !COMPLETE_TYPE_P (TREE_TYPE (parm
)))
8287 error_at (DECL_SOURCE_LOCATION (parm
),
8288 "parameter %qD has incomplete type", parm
);
8289 TREE_TYPE (parm
) = error_mark_node
;
8292 if (!pointer_set_contains (seen_args
, parm
))
8294 error_at (DECL_SOURCE_LOCATION (parm
),
8295 "declaration for parameter %qD but no such parameter",
8298 /* Pretend the parameter was not missing.
8299 This gets us to a standard state and minimizes
8300 further error messages. */
8301 parmids
= chainon (parmids
, tree_cons (parm
, 0, 0));
8305 /* Chain the declarations together in the order of the list of
8306 names. Store that chain in the function decl, replacing the
8307 list of names. Update the current scope to match. */
8308 DECL_ARGUMENTS (fndecl
) = 0;
8310 for (parm
= parmids
; parm
; parm
= TREE_CHAIN (parm
))
8311 if (TREE_PURPOSE (parm
))
8313 if (parm
&& TREE_PURPOSE (parm
))
8315 last
= TREE_PURPOSE (parm
);
8316 DECL_ARGUMENTS (fndecl
) = last
;
8318 for (parm
= TREE_CHAIN (parm
); parm
; parm
= TREE_CHAIN (parm
))
8319 if (TREE_PURPOSE (parm
))
8321 DECL_CHAIN (last
) = TREE_PURPOSE (parm
);
8322 last
= TREE_PURPOSE (parm
);
8324 DECL_CHAIN (last
) = 0;
8327 pointer_set_destroy (seen_args
);
8329 /* If there was a previous prototype,
8330 set the DECL_ARG_TYPE of each argument according to
8331 the type previously specified, and report any mismatches. */
8333 if (current_function_prototype_arg_types
)
8336 for (parm
= DECL_ARGUMENTS (fndecl
),
8337 type
= current_function_prototype_arg_types
;
8338 parm
|| (type
&& TREE_VALUE (type
) != error_mark_node
8339 && (TYPE_MAIN_VARIANT (TREE_VALUE (type
)) != void_type_node
));
8340 parm
= DECL_CHAIN (parm
), type
= TREE_CHAIN (type
))
8342 if (parm
== 0 || type
== 0
8343 || TYPE_MAIN_VARIANT (TREE_VALUE (type
)) == void_type_node
)
8345 if (current_function_prototype_built_in
)
8346 warning_at (DECL_SOURCE_LOCATION (fndecl
),
8347 0, "number of arguments doesn%'t match "
8348 "built-in prototype");
8351 /* FIXME diagnostics: This should be the location of
8352 FNDECL, but there is bug when a prototype is
8353 declared inside function context, but defined
8354 outside of it (e.g., gcc.dg/pr15698-2.c). In
8355 which case FNDECL gets the location of the
8356 prototype, not the definition. */
8357 error_at (input_location
,
8358 "number of arguments doesn%'t match prototype");
8360 error_at (current_function_prototype_locus
,
8361 "prototype declaration");
8365 /* Type for passing arg must be consistent with that
8366 declared for the arg. ISO C says we take the unqualified
8367 type for parameters declared with qualified type. */
8368 if (TREE_TYPE (parm
) != error_mark_node
8369 && TREE_TYPE (type
) != error_mark_node
8370 && ((TYPE_ATOMIC (DECL_ARG_TYPE (parm
))
8371 != TYPE_ATOMIC (TREE_VALUE (type
)))
8372 || !comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm
)),
8373 TYPE_MAIN_VARIANT (TREE_VALUE (type
)))))
8375 if ((TYPE_ATOMIC (DECL_ARG_TYPE (parm
))
8376 == TYPE_ATOMIC (TREE_VALUE (type
)))
8377 && (TYPE_MAIN_VARIANT (TREE_TYPE (parm
))
8378 == TYPE_MAIN_VARIANT (TREE_VALUE (type
))))
8380 /* Adjust argument to match prototype. E.g. a previous
8381 `int foo(float);' prototype causes
8382 `int foo(x) float x; {...}' to be treated like
8383 `int foo(float x) {...}'. This is particularly
8384 useful for argument types like uid_t. */
8385 DECL_ARG_TYPE (parm
) = TREE_TYPE (parm
);
8387 if (targetm
.calls
.promote_prototypes (TREE_TYPE (current_function_decl
))
8388 && INTEGRAL_TYPE_P (TREE_TYPE (parm
))
8389 && TYPE_PRECISION (TREE_TYPE (parm
))
8390 < TYPE_PRECISION (integer_type_node
))
8391 DECL_ARG_TYPE (parm
)
8392 = c_type_promotes_to (TREE_TYPE (parm
));
8394 /* ??? Is it possible to get here with a
8395 built-in prototype or will it always have
8396 been diagnosed as conflicting with an
8397 old-style definition and discarded? */
8398 if (current_function_prototype_built_in
)
8399 warning_at (DECL_SOURCE_LOCATION (parm
),
8400 OPT_Wpedantic
, "promoted argument %qD "
8401 "doesn%'t match built-in prototype", parm
);
8404 pedwarn (DECL_SOURCE_LOCATION (parm
),
8405 OPT_Wpedantic
, "promoted argument %qD "
8406 "doesn%'t match prototype", parm
);
8407 pedwarn (current_function_prototype_locus
, OPT_Wpedantic
,
8408 "prototype declaration");
8413 if (current_function_prototype_built_in
)
8414 warning_at (DECL_SOURCE_LOCATION (parm
),
8415 0, "argument %qD doesn%'t match "
8416 "built-in prototype", parm
);
8419 error_at (DECL_SOURCE_LOCATION (parm
),
8420 "argument %qD doesn%'t match prototype", parm
);
8421 error_at (current_function_prototype_locus
,
8422 "prototype declaration");
8427 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl
)) = 0;
8430 /* Otherwise, create a prototype that would match. */
8434 tree actual
= 0, last
= 0, type
;
8436 for (parm
= DECL_ARGUMENTS (fndecl
); parm
; parm
= DECL_CHAIN (parm
))
8438 type
= tree_cons (NULL_TREE
, DECL_ARG_TYPE (parm
), NULL_TREE
);
8440 TREE_CHAIN (last
) = type
;
8445 type
= tree_cons (NULL_TREE
, void_type_node
, NULL_TREE
);
8447 TREE_CHAIN (last
) = type
;
8451 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
8452 of the type of this function, but we need to avoid having this
8453 affect the types of other similarly-typed functions, so we must
8454 first force the generation of an identical (but separate) type
8455 node for the relevant function type. The new node we create
8456 will be a variant of the main variant of the original function
8459 TREE_TYPE (fndecl
) = build_variant_type_copy (TREE_TYPE (fndecl
));
8461 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl
)) = actual
;
8465 /* Store parameter declarations passed in ARG_INFO into the current
8466 function declaration. */
8469 store_parm_decls_from (struct c_arg_info
*arg_info
)
8471 current_function_arg_info
= arg_info
;
8472 store_parm_decls ();
8475 /* Store the parameter declarations into the current function declaration.
8476 This is called after parsing the parameter declarations, before
8477 digesting the body of the function.
8479 For an old-style definition, construct a prototype out of the old-style
8480 parameter declarations and inject it into the function's type. */
8483 store_parm_decls (void)
8485 tree fndecl
= current_function_decl
;
8488 /* The argument information block for FNDECL. */
8489 struct c_arg_info
*arg_info
= current_function_arg_info
;
8490 current_function_arg_info
= 0;
8492 /* True if this definition is written with a prototype. Note:
8493 despite C99 6.7.5.3p14, we can *not* treat an empty argument
8494 list in a function definition as equivalent to (void) -- an
8495 empty argument list specifies the function has no parameters,
8496 but only (void) sets up a prototype for future calls. */
8497 proto
= arg_info
->types
!= 0;
8500 store_parm_decls_newstyle (fndecl
, arg_info
);
8502 store_parm_decls_oldstyle (fndecl
, arg_info
);
8504 /* The next call to push_scope will be a function body. */
8506 next_is_function_body
= true;
8508 /* Write a record describing this function definition to the prototypes
8509 file (if requested). */
8511 gen_aux_info_record (fndecl
, 1, 0, proto
);
8513 /* Initialize the RTL code for the function. */
8514 allocate_struct_function (fndecl
, false);
8516 if (warn_unused_local_typedefs
)
8517 cfun
->language
= ggc_cleared_alloc
<language_function
> ();
8519 /* Begin the statement tree for this function. */
8520 DECL_SAVED_TREE (fndecl
) = push_stmt_list ();
8522 /* ??? Insert the contents of the pending sizes list into the function
8523 to be evaluated. The only reason left to have this is
8524 void foo(int n, int array[n++])
8525 because we throw away the array type in favor of a pointer type, and
8526 thus won't naturally see the SAVE_EXPR containing the increment. All
8527 other pending sizes would be handled by gimplify_parameters. */
8528 if (arg_info
->pending_sizes
)
8529 add_stmt (arg_info
->pending_sizes
);
8532 /* Store PARM_DECLs in PARMS into scope temporarily. Used for
8533 c_finish_omp_declare_simd for function prototypes. No diagnostics
8537 temp_store_parm_decls (tree fndecl
, tree parms
)
8540 for (tree p
= parms
; p
; p
= DECL_CHAIN (p
))
8542 DECL_CONTEXT (p
) = fndecl
;
8544 bind (DECL_NAME (p
), p
, current_scope
,
8545 /*invisible=*/false, /*nested=*/false,
8550 /* Undo what temp_store_parm_decls did. */
8553 temp_pop_parm_decls (void)
8555 /* Clear all bindings in this temporary scope, so that
8556 pop_scope doesn't create a BLOCK. */
8557 struct c_binding
*b
= current_scope
->bindings
;
8558 current_scope
->bindings
= NULL
;
8559 for (; b
; b
= free_binding_and_advance (b
))
8561 gcc_assert (TREE_CODE (b
->decl
) == PARM_DECL
);
8562 gcc_assert (I_SYMBOL_BINDING (b
->id
) == b
);
8563 I_SYMBOL_BINDING (b
->id
) = b
->shadowed
;
8564 if (b
->shadowed
&& b
->shadowed
->u
.type
)
8565 TREE_TYPE (b
->shadowed
->decl
) = b
->shadowed
->u
.type
;
8571 /* Finish up a function declaration and compile that function
8572 all the way to assembler language output. Then free the storage
8573 for the function definition.
8575 This is called after parsing the body of the function definition. */
8578 finish_function (void)
8580 tree fndecl
= current_function_decl
;
8582 if (c_dialect_objc ())
8583 objc_finish_function ();
8585 if (TREE_CODE (fndecl
) == FUNCTION_DECL
8586 && targetm
.calls
.promote_prototypes (TREE_TYPE (fndecl
)))
8588 tree args
= DECL_ARGUMENTS (fndecl
);
8589 for (; args
; args
= DECL_CHAIN (args
))
8591 tree type
= TREE_TYPE (args
);
8592 if (INTEGRAL_TYPE_P (type
)
8593 && TYPE_PRECISION (type
) < TYPE_PRECISION (integer_type_node
))
8594 DECL_ARG_TYPE (args
) = c_type_promotes_to (type
);
8598 if (DECL_INITIAL (fndecl
) && DECL_INITIAL (fndecl
) != error_mark_node
)
8599 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl
)) = fndecl
;
8601 /* Must mark the RESULT_DECL as being in this function. */
8603 if (DECL_RESULT (fndecl
) && DECL_RESULT (fndecl
) != error_mark_node
)
8604 DECL_CONTEXT (DECL_RESULT (fndecl
)) = fndecl
;
8606 if (MAIN_NAME_P (DECL_NAME (fndecl
)) && flag_hosted
8607 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl
)))
8608 == integer_type_node
&& flag_isoc99
)
8610 /* Hack. We don't want the middle-end to warn that this return
8611 is unreachable, so we mark its location as special. Using
8612 UNKNOWN_LOCATION has the problem that it gets clobbered in
8613 annotate_one_with_locus. A cleaner solution might be to
8614 ensure ! should_carry_locus_p (stmt), but that needs a flag.
8616 c_finish_return (BUILTINS_LOCATION
, integer_zero_node
, NULL_TREE
);
8619 /* Tie off the statement tree for this function. */
8620 DECL_SAVED_TREE (fndecl
) = pop_stmt_list (DECL_SAVED_TREE (fndecl
));
8622 /* If the function has _Cilk_spawn in front of a function call inside it
8623 i.e. it is a spawning function, then add the appropriate Cilk plus
8624 functions inside. */
8625 if (fn_contains_cilk_spawn_p (cfun
))
8626 cfun
->cilk_frame_decl
= insert_cilk_frame (fndecl
);
8628 finish_fname_decls ();
8630 /* Complain if there's just no return statement. */
8631 if (warn_return_type
8632 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl
))) != VOID_TYPE
8633 && !current_function_returns_value
&& !current_function_returns_null
8634 /* Don't complain if we are no-return. */
8635 && !current_function_returns_abnormally
8636 /* Don't complain if we are declared noreturn. */
8637 && !TREE_THIS_VOLATILE (fndecl
)
8638 /* Don't warn for main(). */
8639 && !MAIN_NAME_P (DECL_NAME (fndecl
))
8640 /* Or if they didn't actually specify a return type. */
8641 && !C_FUNCTION_IMPLICIT_INT (fndecl
)
8642 /* Normally, with -Wreturn-type, flow will complain, but we might
8643 optimize out static functions. */
8644 && !TREE_PUBLIC (fndecl
))
8646 warning (OPT_Wreturn_type
,
8647 "no return statement in function returning non-void");
8648 TREE_NO_WARNING (fndecl
) = 1;
8651 /* Complain about parameters that are only set, but never otherwise used. */
8652 if (warn_unused_but_set_parameter
)
8656 for (decl
= DECL_ARGUMENTS (fndecl
);
8658 decl
= DECL_CHAIN (decl
))
8659 if (TREE_USED (decl
)
8660 && TREE_CODE (decl
) == PARM_DECL
8661 && !DECL_READ_P (decl
)
8663 && !DECL_ARTIFICIAL (decl
)
8664 && !TREE_NO_WARNING (decl
))
8665 warning_at (DECL_SOURCE_LOCATION (decl
),
8666 OPT_Wunused_but_set_parameter
,
8667 "parameter %qD set but not used", decl
);
8670 /* Complain about locally defined typedefs that are not used in this
8672 maybe_warn_unused_local_typedefs ();
8674 /* Store the end of the function, so that we get good line number
8675 info for the epilogue. */
8676 cfun
->function_end_locus
= input_location
;
8678 /* Finalize the ELF visibility for the function. */
8679 c_determine_visibility (fndecl
);
8681 /* For GNU C extern inline functions disregard inline limits. */
8682 if (DECL_EXTERNAL (fndecl
)
8683 && DECL_DECLARED_INLINE_P (fndecl
))
8684 DECL_DISREGARD_INLINE_LIMITS (fndecl
) = 1;
8686 /* Genericize before inlining. Delay genericizing nested functions
8687 until their parent function is genericized. Since finalizing
8688 requires GENERIC, delay that as well. */
8690 if (DECL_INITIAL (fndecl
) && DECL_INITIAL (fndecl
) != error_mark_node
8691 && !undef_nested_function
)
8693 if (!decl_function_context (fndecl
))
8695 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE
, fndecl
);
8696 c_genericize (fndecl
);
8698 /* ??? Objc emits functions after finalizing the compilation unit.
8699 This should be cleaned up later and this conditional removed. */
8700 if (cgraph_global_info_ready
)
8702 cgraph_add_new_function (fndecl
, false);
8705 cgraph_finalize_function (fndecl
, false);
8709 /* Register this function with cgraph just far enough to get it
8710 added to our parent's nested function list. Handy, since the
8711 C front end doesn't have such a list. */
8712 (void) cgraph_get_create_node (fndecl
);
8716 if (!decl_function_context (fndecl
))
8717 undef_nested_function
= false;
8719 if (cfun
->language
!= NULL
)
8721 ggc_free (cfun
->language
);
8722 cfun
->language
= NULL
;
8725 /* We're leaving the context of this function, so zap cfun.
8726 It's still in DECL_STRUCT_FUNCTION, and we'll restore it in
8727 tree_rest_of_compilation. */
8729 current_function_decl
= NULL
;
8732 /* Check the declarations given in a for-loop for satisfying the C99
8733 constraints. If exactly one such decl is found, return it. LOC is
8734 the location of the opening parenthesis of the for loop. The last
8735 parameter allows you to control the "for loop initial declarations
8736 are only allowed in C99 mode". Normally, you should pass
8737 flag_isoc99 as that parameter. But in some cases (Objective-C
8738 foreach loop, for example) we want to run the checks in this
8739 function even if not in C99 mode, so we allow the caller to turn
8740 off the error about not being in C99 mode.
8744 check_for_loop_decls (location_t loc
, bool turn_off_iso_c99_error
)
8746 struct c_binding
*b
;
8747 tree one_decl
= NULL_TREE
;
8750 if (!turn_off_iso_c99_error
)
8752 static bool hint
= true;
8753 /* If we get here, declarations have been used in a for loop without
8754 the C99 for loop scope. This doesn't make much sense, so don't
8756 error_at (loc
, "%<for%> loop initial declarations "
8757 "are only allowed in C99 or C11 mode");
8761 "use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 "
8762 "to compile your code");
8767 /* C99 subclause 6.8.5 paragraph 3:
8769 [#3] The declaration part of a for statement shall only
8770 declare identifiers for objects having storage class auto or
8773 It isn't clear whether, in this sentence, "identifiers" binds to
8774 "shall only declare" or to "objects" - that is, whether all identifiers
8775 declared must be identifiers for objects, or whether the restriction
8776 only applies to those that are. (A question on this in comp.std.c
8777 in November 2000 received no answer.) We implement the strictest
8778 interpretation, to avoid creating an extension which later causes
8781 for (b
= current_scope
->bindings
; b
; b
= b
->prev
)
8784 tree decl
= b
->decl
;
8789 switch (TREE_CODE (decl
))
8793 location_t decl_loc
= DECL_SOURCE_LOCATION (decl
);
8794 if (TREE_STATIC (decl
))
8796 "declaration of static variable %qD in %<for%> loop "
8797 "initial declaration", decl
);
8798 else if (DECL_EXTERNAL (decl
))
8800 "declaration of %<extern%> variable %qD in %<for%> loop "
8801 "initial declaration", decl
);
8807 "%<struct %E%> declared in %<for%> loop initial "
8812 "%<union %E%> declared in %<for%> loop initial declaration",
8816 error_at (loc
, "%<enum %E%> declared in %<for%> loop "
8817 "initial declaration", id
);
8820 error_at (loc
, "declaration of non-variable "
8821 "%qD in %<for%> loop initial declaration", decl
);
8828 return n_decls
== 1 ? one_decl
: NULL_TREE
;
8831 /* Save and reinitialize the variables
8832 used during compilation of a C function. */
8835 c_push_function_context (void)
8837 struct language_function
*p
= cfun
->language
;
8838 /* cfun->language might have been already allocated by the use of
8839 -Wunused-local-typedefs. In that case, just re-use it. */
8841 cfun
->language
= p
= ggc_cleared_alloc
<language_function
> ();
8843 p
->base
.x_stmt_tree
= c_stmt_tree
;
8844 c_stmt_tree
.x_cur_stmt_list
= vec_safe_copy (c_stmt_tree
.x_cur_stmt_list
);
8845 p
->x_break_label
= c_break_label
;
8846 p
->x_cont_label
= c_cont_label
;
8847 p
->x_switch_stack
= c_switch_stack
;
8848 p
->arg_info
= current_function_arg_info
;
8849 p
->returns_value
= current_function_returns_value
;
8850 p
->returns_null
= current_function_returns_null
;
8851 p
->returns_abnormally
= current_function_returns_abnormally
;
8852 p
->warn_about_return_type
= warn_about_return_type
;
8854 push_function_context ();
8857 /* Restore the variables used during compilation of a C function. */
8860 c_pop_function_context (void)
8862 struct language_function
*p
;
8864 pop_function_context ();
8867 /* When -Wunused-local-typedefs is in effect, cfun->languages is
8868 used to store data throughout the life time of the current cfun,
8869 So don't deallocate it. */
8870 if (!warn_unused_local_typedefs
)
8871 cfun
->language
= NULL
;
8873 if (DECL_STRUCT_FUNCTION (current_function_decl
) == 0
8874 && DECL_SAVED_TREE (current_function_decl
) == NULL_TREE
)
8876 /* Stop pointing to the local nodes about to be freed. */
8877 /* But DECL_INITIAL must remain nonzero so we know this
8878 was an actual function definition. */
8879 DECL_INITIAL (current_function_decl
) = error_mark_node
;
8880 DECL_ARGUMENTS (current_function_decl
) = 0;
8883 c_stmt_tree
= p
->base
.x_stmt_tree
;
8884 p
->base
.x_stmt_tree
.x_cur_stmt_list
= NULL
;
8885 c_break_label
= p
->x_break_label
;
8886 c_cont_label
= p
->x_cont_label
;
8887 c_switch_stack
= p
->x_switch_stack
;
8888 current_function_arg_info
= p
->arg_info
;
8889 current_function_returns_value
= p
->returns_value
;
8890 current_function_returns_null
= p
->returns_null
;
8891 current_function_returns_abnormally
= p
->returns_abnormally
;
8892 warn_about_return_type
= p
->warn_about_return_type
;
8895 /* The functions below are required for functionality of doing
8896 function at once processing in the C front end. Currently these
8897 functions are not called from anywhere in the C front end, but as
8898 these changes continue, that will change. */
8900 /* Returns the stmt_tree (if any) to which statements are currently
8901 being added. If there is no active statement-tree, NULL is
8905 current_stmt_tree (void)
8907 return &c_stmt_tree
;
8910 /* Return the global value of T as a symbol. */
8913 identifier_global_value (tree t
)
8915 struct c_binding
*b
;
8917 for (b
= I_SYMBOL_BINDING (t
); b
; b
= b
->shadowed
)
8918 if (B_IN_FILE_SCOPE (b
) || B_IN_EXTERNAL_SCOPE (b
))
8924 /* In C, the only C-linkage public declaration is at file scope. */
8927 c_linkage_bindings (tree name
)
8929 return identifier_global_value (name
);
8932 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
8933 otherwise the name is found in ridpointers from RID_INDEX. */
8936 record_builtin_type (enum rid rid_index
, const char *name
, tree type
)
8940 id
= ridpointers
[(int) rid_index
];
8942 id
= get_identifier (name
);
8943 decl
= build_decl (UNKNOWN_LOCATION
, TYPE_DECL
, id
, type
);
8945 if (debug_hooks
->type_decl
)
8946 debug_hooks
->type_decl (decl
, false);
8949 /* Build the void_list_node (void_type_node having been created). */
8951 build_void_list_node (void)
8953 tree t
= build_tree_list (NULL_TREE
, void_type_node
);
8957 /* Return a c_parm structure with the given SPECS, ATTRS and DECLARATOR. */
8960 build_c_parm (struct c_declspecs
*specs
, tree attrs
,
8961 struct c_declarator
*declarator
)
8963 struct c_parm
*ret
= XOBNEW (&parser_obstack
, struct c_parm
);
8966 ret
->declarator
= declarator
;
8970 /* Return a declarator with nested attributes. TARGET is the inner
8971 declarator to which these attributes apply. ATTRS are the
8974 struct c_declarator
*
8975 build_attrs_declarator (tree attrs
, struct c_declarator
*target
)
8977 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
8978 ret
->kind
= cdk_attrs
;
8979 ret
->declarator
= target
;
8980 ret
->u
.attrs
= attrs
;
8984 /* Return a declarator for a function with arguments specified by ARGS
8985 and return type specified by TARGET. */
8987 struct c_declarator
*
8988 build_function_declarator (struct c_arg_info
*args
,
8989 struct c_declarator
*target
)
8991 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
8992 ret
->kind
= cdk_function
;
8993 ret
->declarator
= target
;
8994 ret
->u
.arg_info
= args
;
8998 /* Return a declarator for the identifier IDENT (which may be
8999 NULL_TREE for an abstract declarator). */
9001 struct c_declarator
*
9002 build_id_declarator (tree ident
)
9004 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
9006 ret
->declarator
= 0;
9008 /* Default value - may get reset to a more precise location. */
9009 ret
->id_loc
= input_location
;
9013 /* Return something to represent absolute declarators containing a *.
9014 TARGET is the absolute declarator that the * contains.
9015 TYPE_QUALS_ATTRS is a structure for type qualifiers and attributes
9016 to apply to the pointer type. */
9018 struct c_declarator
*
9019 make_pointer_declarator (struct c_declspecs
*type_quals_attrs
,
9020 struct c_declarator
*target
)
9024 struct c_declarator
*itarget
= target
;
9025 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
9026 if (type_quals_attrs
)
9028 attrs
= type_quals_attrs
->attrs
;
9029 quals
= quals_from_declspecs (type_quals_attrs
);
9030 if (attrs
!= NULL_TREE
)
9031 itarget
= build_attrs_declarator (attrs
, target
);
9033 ret
->kind
= cdk_pointer
;
9034 ret
->declarator
= itarget
;
9035 ret
->u
.pointer_quals
= quals
;
9039 /* Return a pointer to a structure for an empty list of declaration
9042 struct c_declspecs
*
9043 build_null_declspecs (void)
9045 struct c_declspecs
*ret
= XOBNEW (&parser_obstack
, struct c_declspecs
);
9046 memset (&ret
->locations
, 0, cdw_number_of_elements
);
9051 ret
->align_log
= -1;
9052 ret
->typespec_word
= cts_none
;
9053 ret
->storage_class
= csc_none
;
9054 ret
->expr_const_operands
= true;
9055 ret
->declspecs_seen_p
= false;
9056 ret
->typespec_kind
= ctsk_none
;
9057 ret
->non_sc_seen_p
= false;
9058 ret
->typedef_p
= false;
9059 ret
->explicit_signed_p
= false;
9060 ret
->deprecated_p
= false;
9061 ret
->default_int_p
= false;
9062 ret
->long_p
= false;
9063 ret
->long_long_p
= false;
9064 ret
->short_p
= false;
9065 ret
->signed_p
= false;
9066 ret
->unsigned_p
= false;
9067 ret
->complex_p
= false;
9068 ret
->inline_p
= false;
9069 ret
->noreturn_p
= false;
9070 ret
->thread_p
= false;
9071 ret
->thread_gnu_p
= false;
9072 ret
->const_p
= false;
9073 ret
->volatile_p
= false;
9074 ret
->atomic_p
= false;
9075 ret
->restrict_p
= false;
9076 ret
->saturating_p
= false;
9077 ret
->alignas_p
= false;
9078 ret
->address_space
= ADDR_SPACE_GENERIC
;
9082 /* Add the address space ADDRSPACE to the declaration specifiers
9083 SPECS, returning SPECS. */
9085 struct c_declspecs
*
9086 declspecs_add_addrspace (source_location location
,
9087 struct c_declspecs
*specs
, addr_space_t as
)
9089 specs
->non_sc_seen_p
= true;
9090 specs
->declspecs_seen_p
= true;
9092 if (!ADDR_SPACE_GENERIC_P (specs
->address_space
)
9093 && specs
->address_space
!= as
)
9094 error ("incompatible address space qualifiers %qs and %qs",
9095 c_addr_space_name (as
),
9096 c_addr_space_name (specs
->address_space
));
9099 specs
->address_space
= as
;
9100 specs
->locations
[cdw_address_space
] = location
;
9105 /* Add the type qualifier QUAL to the declaration specifiers SPECS,
9108 struct c_declspecs
*
9109 declspecs_add_qual (source_location loc
,
9110 struct c_declspecs
*specs
, tree qual
)
9114 specs
->non_sc_seen_p
= true;
9115 specs
->declspecs_seen_p
= true;
9116 gcc_assert (TREE_CODE (qual
) == IDENTIFIER_NODE
9117 && C_IS_RESERVED_WORD (qual
));
9118 i
= C_RID_CODE (qual
);
9122 dupe
= specs
->const_p
;
9123 specs
->const_p
= true;
9124 specs
->locations
[cdw_const
] = loc
;
9127 dupe
= specs
->volatile_p
;
9128 specs
->volatile_p
= true;
9129 specs
->locations
[cdw_volatile
] = loc
;
9132 dupe
= specs
->restrict_p
;
9133 specs
->restrict_p
= true;
9134 specs
->locations
[cdw_restrict
] = loc
;
9137 dupe
= specs
->atomic_p
;
9138 specs
->atomic_p
= true;
9143 if (dupe
&& !flag_isoc99
)
9144 pedwarn (loc
, OPT_Wpedantic
, "duplicate %qE", qual
);
9148 /* Add the type specifier TYPE to the declaration specifiers SPECS,
9151 struct c_declspecs
*
9152 declspecs_add_type (location_t loc
, struct c_declspecs
*specs
,
9153 struct c_typespec spec
)
9155 tree type
= spec
.spec
;
9156 specs
->non_sc_seen_p
= true;
9157 specs
->declspecs_seen_p
= true;
9158 specs
->typespec_kind
= spec
.kind
;
9159 if (TREE_DEPRECATED (type
))
9160 specs
->deprecated_p
= true;
9162 /* Handle type specifier keywords. */
9163 if (TREE_CODE (type
) == IDENTIFIER_NODE
9164 && C_IS_RESERVED_WORD (type
)
9165 && C_RID_CODE (type
) != RID_CXX_COMPAT_WARN
)
9167 enum rid i
= C_RID_CODE (type
);
9170 error_at (loc
, "two or more data types in declaration specifiers");
9173 if ((int) i
<= (int) RID_LAST_MODIFIER
)
9175 /* "long", "short", "signed", "unsigned", "_Complex" or "_Sat". */
9180 if (specs
->long_long_p
)
9182 error_at (loc
, "%<long long long%> is too long for GCC");
9187 if (specs
->typespec_word
== cts_double
)
9190 ("both %<long long%> and %<double%> in "
9191 "declaration specifiers"));
9194 pedwarn_c90 (loc
, OPT_Wlong_long
,
9195 "ISO C90 does not support %<long long%>");
9196 specs
->long_long_p
= 1;
9197 specs
->locations
[cdw_long_long
] = loc
;
9202 ("both %<long%> and %<short%> in "
9203 "declaration specifiers"));
9204 else if (specs
->typespec_word
== cts_auto_type
)
9206 ("both %<long%> and %<__auto_type%> in "
9207 "declaration specifiers"));
9208 else if (specs
->typespec_word
== cts_void
)
9210 ("both %<long%> and %<void%> in "
9211 "declaration specifiers"));
9212 else if (specs
->typespec_word
== cts_int128
)
9214 ("both %<long%> and %<__int128%> in "
9215 "declaration specifiers"));
9216 else if (specs
->typespec_word
== cts_bool
)
9218 ("both %<long%> and %<_Bool%> in "
9219 "declaration specifiers"));
9220 else if (specs
->typespec_word
== cts_char
)
9222 ("both %<long%> and %<char%> in "
9223 "declaration specifiers"));
9224 else if (specs
->typespec_word
== cts_float
)
9226 ("both %<long%> and %<float%> in "
9227 "declaration specifiers"));
9228 else if (specs
->typespec_word
== cts_dfloat32
)
9230 ("both %<long%> and %<_Decimal32%> in "
9231 "declaration specifiers"));
9232 else if (specs
->typespec_word
== cts_dfloat64
)
9234 ("both %<long%> and %<_Decimal64%> in "
9235 "declaration specifiers"));
9236 else if (specs
->typespec_word
== cts_dfloat128
)
9238 ("both %<long%> and %<_Decimal128%> in "
9239 "declaration specifiers"));
9242 specs
->long_p
= true;
9243 specs
->locations
[cdw_long
] = loc
;
9247 dupe
= specs
->short_p
;
9250 ("both %<long%> and %<short%> in "
9251 "declaration specifiers"));
9252 else if (specs
->typespec_word
== cts_auto_type
)
9254 ("both %<short%> and %<__auto_type%> in "
9255 "declaration specifiers"));
9256 else if (specs
->typespec_word
== cts_void
)
9258 ("both %<short%> and %<void%> in "
9259 "declaration specifiers"));
9260 else if (specs
->typespec_word
== cts_int128
)
9262 ("both %<short%> and %<__int128%> in "
9263 "declaration specifiers"));
9264 else if (specs
->typespec_word
== cts_bool
)
9266 ("both %<short%> and %<_Bool%> in "
9267 "declaration specifiers"));
9268 else if (specs
->typespec_word
== cts_char
)
9270 ("both %<short%> and %<char%> in "
9271 "declaration specifiers"));
9272 else if (specs
->typespec_word
== cts_float
)
9274 ("both %<short%> and %<float%> in "
9275 "declaration specifiers"));
9276 else if (specs
->typespec_word
== cts_double
)
9278 ("both %<short%> and %<double%> in "
9279 "declaration specifiers"));
9280 else if (specs
->typespec_word
== cts_dfloat32
)
9282 ("both %<short%> and %<_Decimal32%> in "
9283 "declaration specifiers"));
9284 else if (specs
->typespec_word
== cts_dfloat64
)
9286 ("both %<short%> and %<_Decimal64%> in "
9287 "declaration specifiers"));
9288 else if (specs
->typespec_word
== cts_dfloat128
)
9290 ("both %<short%> and %<_Decimal128%> in "
9291 "declaration specifiers"));
9294 specs
->short_p
= true;
9295 specs
->locations
[cdw_short
] = loc
;
9299 dupe
= specs
->signed_p
;
9300 if (specs
->unsigned_p
)
9302 ("both %<signed%> and %<unsigned%> in "
9303 "declaration specifiers"));
9304 else if (specs
->typespec_word
== cts_auto_type
)
9306 ("both %<signed%> and %<__auto_type%> in "
9307 "declaration specifiers"));
9308 else if (specs
->typespec_word
== cts_void
)
9310 ("both %<signed%> and %<void%> in "
9311 "declaration specifiers"));
9312 else if (specs
->typespec_word
== cts_bool
)
9314 ("both %<signed%> and %<_Bool%> in "
9315 "declaration specifiers"));
9316 else if (specs
->typespec_word
== cts_float
)
9318 ("both %<signed%> and %<float%> in "
9319 "declaration specifiers"));
9320 else if (specs
->typespec_word
== cts_double
)
9322 ("both %<signed%> and %<double%> in "
9323 "declaration specifiers"));
9324 else if (specs
->typespec_word
== cts_dfloat32
)
9326 ("both %<signed%> and %<_Decimal32%> in "
9327 "declaration specifiers"));
9328 else if (specs
->typespec_word
== cts_dfloat64
)
9330 ("both %<signed%> and %<_Decimal64%> in "
9331 "declaration specifiers"));
9332 else if (specs
->typespec_word
== cts_dfloat128
)
9334 ("both %<signed%> and %<_Decimal128%> in "
9335 "declaration specifiers"));
9338 specs
->signed_p
= true;
9339 specs
->locations
[cdw_signed
] = loc
;
9343 dupe
= specs
->unsigned_p
;
9344 if (specs
->signed_p
)
9346 ("both %<signed%> and %<unsigned%> in "
9347 "declaration specifiers"));
9348 else if (specs
->typespec_word
== cts_auto_type
)
9350 ("both %<unsigned%> and %<__auto_type%> in "
9351 "declaration specifiers"));
9352 else if (specs
->typespec_word
== cts_void
)
9354 ("both %<unsigned%> and %<void%> in "
9355 "declaration specifiers"));
9356 else if (specs
->typespec_word
== cts_bool
)
9358 ("both %<unsigned%> and %<_Bool%> in "
9359 "declaration specifiers"));
9360 else if (specs
->typespec_word
== cts_float
)
9362 ("both %<unsigned%> and %<float%> in "
9363 "declaration specifiers"));
9364 else if (specs
->typespec_word
== cts_double
)
9366 ("both %<unsigned%> and %<double%> in "
9367 "declaration specifiers"));
9368 else if (specs
->typespec_word
== cts_dfloat32
)
9370 ("both %<unsigned%> and %<_Decimal32%> in "
9371 "declaration specifiers"));
9372 else if (specs
->typespec_word
== cts_dfloat64
)
9374 ("both %<unsigned%> and %<_Decimal64%> in "
9375 "declaration specifiers"));
9376 else if (specs
->typespec_word
== cts_dfloat128
)
9378 ("both %<unsigned%> and %<_Decimal128%> in "
9379 "declaration specifiers"));
9382 specs
->unsigned_p
= true;
9383 specs
->locations
[cdw_unsigned
] = loc
;
9387 dupe
= specs
->complex_p
;
9388 if (!flag_isoc99
&& !in_system_header_at (loc
))
9389 pedwarn (loc
, OPT_Wpedantic
,
9390 "ISO C90 does not support complex types");
9391 if (specs
->typespec_word
== cts_auto_type
)
9393 ("both %<complex%> and %<__auto_type%> in "
9394 "declaration specifiers"));
9395 else if (specs
->typespec_word
== cts_void
)
9397 ("both %<complex%> and %<void%> in "
9398 "declaration specifiers"));
9399 else if (specs
->typespec_word
== cts_bool
)
9401 ("both %<complex%> and %<_Bool%> in "
9402 "declaration specifiers"));
9403 else if (specs
->typespec_word
== cts_dfloat32
)
9405 ("both %<complex%> and %<_Decimal32%> in "
9406 "declaration specifiers"));
9407 else if (specs
->typespec_word
== cts_dfloat64
)
9409 ("both %<complex%> and %<_Decimal64%> in "
9410 "declaration specifiers"));
9411 else if (specs
->typespec_word
== cts_dfloat128
)
9413 ("both %<complex%> and %<_Decimal128%> in "
9414 "declaration specifiers"));
9415 else if (specs
->typespec_word
== cts_fract
)
9417 ("both %<complex%> and %<_Fract%> in "
9418 "declaration specifiers"));
9419 else if (specs
->typespec_word
== cts_accum
)
9421 ("both %<complex%> and %<_Accum%> in "
9422 "declaration specifiers"));
9423 else if (specs
->saturating_p
)
9425 ("both %<complex%> and %<_Sat%> in "
9426 "declaration specifiers"));
9429 specs
->complex_p
= true;
9430 specs
->locations
[cdw_complex
] = loc
;
9434 dupe
= specs
->saturating_p
;
9435 pedwarn (loc
, OPT_Wpedantic
,
9436 "ISO C does not support saturating types");
9437 if (specs
->typespec_word
== cts_int128
)
9440 ("both %<_Sat%> and %<__int128%> in "
9441 "declaration specifiers"));
9443 else if (specs
->typespec_word
== cts_auto_type
)
9445 ("both %<_Sat%> and %<__auto_type%> in "
9446 "declaration specifiers"));
9447 else if (specs
->typespec_word
== cts_void
)
9449 ("both %<_Sat%> and %<void%> in "
9450 "declaration specifiers"));
9451 else if (specs
->typespec_word
== cts_bool
)
9453 ("both %<_Sat%> and %<_Bool%> in "
9454 "declaration specifiers"));
9455 else if (specs
->typespec_word
== cts_char
)
9457 ("both %<_Sat%> and %<char%> in "
9458 "declaration specifiers"));
9459 else if (specs
->typespec_word
== cts_int
)
9461 ("both %<_Sat%> and %<int%> in "
9462 "declaration specifiers"));
9463 else if (specs
->typespec_word
== cts_float
)
9465 ("both %<_Sat%> and %<float%> in "
9466 "declaration specifiers"));
9467 else if (specs
->typespec_word
== cts_double
)
9469 ("both %<_Sat%> and %<double%> in "
9470 "declaration specifiers"));
9471 else if (specs
->typespec_word
== cts_dfloat32
)
9473 ("both %<_Sat%> and %<_Decimal32%> in "
9474 "declaration specifiers"));
9475 else if (specs
->typespec_word
== cts_dfloat64
)
9477 ("both %<_Sat%> and %<_Decimal64%> in "
9478 "declaration specifiers"));
9479 else if (specs
->typespec_word
== cts_dfloat128
)
9481 ("both %<_Sat%> and %<_Decimal128%> in "
9482 "declaration specifiers"));
9483 else if (specs
->complex_p
)
9485 ("both %<_Sat%> and %<complex%> in "
9486 "declaration specifiers"));
9489 specs
->saturating_p
= true;
9490 specs
->locations
[cdw_saturating
] = loc
;
9498 error_at (loc
, "duplicate %qE", type
);
9504 /* "void", "_Bool", "char", "int", "float", "double", "_Decimal32",
9505 "__int128", "_Decimal64", "_Decimal128", "_Fract", "_Accum" or
9507 if (specs
->typespec_word
!= cts_none
)
9510 "two or more data types in declaration specifiers");
9518 ("both %<long%> and %<__auto_type%> in "
9519 "declaration specifiers"));
9520 else if (specs
->short_p
)
9522 ("both %<short%> and %<__auto_type%> in "
9523 "declaration specifiers"));
9524 else if (specs
->signed_p
)
9526 ("both %<signed%> and %<__auto_type%> in "
9527 "declaration specifiers"));
9528 else if (specs
->unsigned_p
)
9530 ("both %<unsigned%> and %<__auto_type%> in "
9531 "declaration specifiers"));
9532 else if (specs
->complex_p
)
9534 ("both %<complex%> and %<__auto_type%> in "
9535 "declaration specifiers"));
9536 else if (specs
->saturating_p
)
9538 ("both %<_Sat%> and %<__auto_type%> in "
9539 "declaration specifiers"));
9542 specs
->typespec_word
= cts_auto_type
;
9543 specs
->locations
[cdw_typespec
] = loc
;
9547 if (int128_integer_type_node
== NULL_TREE
)
9549 error_at (loc
, "%<__int128%> is not supported for this target");
9552 if (!in_system_header_at (input_location
))
9553 pedwarn (loc
, OPT_Wpedantic
,
9554 "ISO C does not support %<__int128%> type");
9558 ("both %<__int128%> and %<long%> in "
9559 "declaration specifiers"));
9560 else if (specs
->saturating_p
)
9562 ("both %<_Sat%> and %<__int128%> in "
9563 "declaration specifiers"));
9564 else if (specs
->short_p
)
9566 ("both %<__int128%> and %<short%> in "
9567 "declaration specifiers"));
9570 specs
->typespec_word
= cts_int128
;
9571 specs
->locations
[cdw_typespec
] = loc
;
9577 ("both %<long%> and %<void%> in "
9578 "declaration specifiers"));
9579 else if (specs
->short_p
)
9581 ("both %<short%> and %<void%> in "
9582 "declaration specifiers"));
9583 else if (specs
->signed_p
)
9585 ("both %<signed%> and %<void%> in "
9586 "declaration specifiers"));
9587 else if (specs
->unsigned_p
)
9589 ("both %<unsigned%> and %<void%> in "
9590 "declaration specifiers"));
9591 else if (specs
->complex_p
)
9593 ("both %<complex%> and %<void%> in "
9594 "declaration specifiers"));
9595 else if (specs
->saturating_p
)
9597 ("both %<_Sat%> and %<void%> in "
9598 "declaration specifiers"));
9601 specs
->typespec_word
= cts_void
;
9602 specs
->locations
[cdw_typespec
] = loc
;
9606 if (!flag_isoc99
&& !in_system_header_at (loc
))
9607 pedwarn (loc
, OPT_Wpedantic
,
9608 "ISO C90 does not support boolean types");
9611 ("both %<long%> and %<_Bool%> in "
9612 "declaration specifiers"));
9613 else if (specs
->short_p
)
9615 ("both %<short%> and %<_Bool%> in "
9616 "declaration specifiers"));
9617 else if (specs
->signed_p
)
9619 ("both %<signed%> and %<_Bool%> in "
9620 "declaration specifiers"));
9621 else if (specs
->unsigned_p
)
9623 ("both %<unsigned%> and %<_Bool%> in "
9624 "declaration specifiers"));
9625 else if (specs
->complex_p
)
9627 ("both %<complex%> and %<_Bool%> in "
9628 "declaration specifiers"));
9629 else if (specs
->saturating_p
)
9631 ("both %<_Sat%> and %<_Bool%> in "
9632 "declaration specifiers"));
9635 specs
->typespec_word
= cts_bool
;
9636 specs
->locations
[cdw_typespec
] = loc
;
9642 ("both %<long%> and %<char%> in "
9643 "declaration specifiers"));
9644 else if (specs
->short_p
)
9646 ("both %<short%> and %<char%> in "
9647 "declaration specifiers"));
9648 else if (specs
->saturating_p
)
9650 ("both %<_Sat%> and %<char%> in "
9651 "declaration specifiers"));
9654 specs
->typespec_word
= cts_char
;
9655 specs
->locations
[cdw_typespec
] = loc
;
9659 if (specs
->saturating_p
)
9661 ("both %<_Sat%> and %<int%> in "
9662 "declaration specifiers"));
9665 specs
->typespec_word
= cts_int
;
9666 specs
->locations
[cdw_typespec
] = loc
;
9672 ("both %<long%> and %<float%> in "
9673 "declaration specifiers"));
9674 else if (specs
->short_p
)
9676 ("both %<short%> and %<float%> in "
9677 "declaration specifiers"));
9678 else if (specs
->signed_p
)
9680 ("both %<signed%> and %<float%> in "
9681 "declaration specifiers"));
9682 else if (specs
->unsigned_p
)
9684 ("both %<unsigned%> and %<float%> in "
9685 "declaration specifiers"));
9686 else if (specs
->saturating_p
)
9688 ("both %<_Sat%> and %<float%> in "
9689 "declaration specifiers"));
9692 specs
->typespec_word
= cts_float
;
9693 specs
->locations
[cdw_typespec
] = loc
;
9697 if (specs
->long_long_p
)
9699 ("both %<long long%> and %<double%> in "
9700 "declaration specifiers"));
9701 else if (specs
->short_p
)
9703 ("both %<short%> and %<double%> in "
9704 "declaration specifiers"));
9705 else if (specs
->signed_p
)
9707 ("both %<signed%> and %<double%> in "
9708 "declaration specifiers"));
9709 else if (specs
->unsigned_p
)
9711 ("both %<unsigned%> and %<double%> in "
9712 "declaration specifiers"));
9713 else if (specs
->saturating_p
)
9715 ("both %<_Sat%> and %<double%> in "
9716 "declaration specifiers"));
9719 specs
->typespec_word
= cts_double
;
9720 specs
->locations
[cdw_typespec
] = loc
;
9728 if (i
== RID_DFLOAT32
)
9730 else if (i
== RID_DFLOAT64
)
9733 str
= "_Decimal128";
9734 if (specs
->long_long_p
)
9736 ("both %<long long%> and %<%s%> in "
9737 "declaration specifiers"),
9741 ("both %<long%> and %<%s%> in "
9742 "declaration specifiers"),
9744 else if (specs
->short_p
)
9746 ("both %<short%> and %<%s%> in "
9747 "declaration specifiers"),
9749 else if (specs
->signed_p
)
9751 ("both %<signed%> and %<%s%> in "
9752 "declaration specifiers"),
9754 else if (specs
->unsigned_p
)
9756 ("both %<unsigned%> and %<%s%> in "
9757 "declaration specifiers"),
9759 else if (specs
->complex_p
)
9761 ("both %<complex%> and %<%s%> in "
9762 "declaration specifiers"),
9764 else if (specs
->saturating_p
)
9766 ("both %<_Sat%> and %<%s%> in "
9767 "declaration specifiers"),
9769 else if (i
== RID_DFLOAT32
)
9770 specs
->typespec_word
= cts_dfloat32
;
9771 else if (i
== RID_DFLOAT64
)
9772 specs
->typespec_word
= cts_dfloat64
;
9774 specs
->typespec_word
= cts_dfloat128
;
9775 specs
->locations
[cdw_typespec
] = loc
;
9777 if (!targetm
.decimal_float_supported_p ())
9779 ("decimal floating point not supported "
9780 "for this target"));
9781 pedwarn (loc
, OPT_Wpedantic
,
9782 "ISO C does not support decimal floating point");
9792 if (specs
->complex_p
)
9794 ("both %<complex%> and %<%s%> in "
9795 "declaration specifiers"),
9797 else if (i
== RID_FRACT
)
9798 specs
->typespec_word
= cts_fract
;
9800 specs
->typespec_word
= cts_accum
;
9801 specs
->locations
[cdw_typespec
] = loc
;
9803 if (!targetm
.fixed_point_supported_p ())
9805 "fixed-point types not supported for this target");
9806 pedwarn (loc
, OPT_Wpedantic
,
9807 "ISO C does not support fixed-point types");
9810 /* ObjC reserved word "id", handled below. */
9816 /* Now we have a typedef (a TYPE_DECL node), an identifier (some
9817 form of ObjC type, cases such as "int" and "long" being handled
9818 above), a TYPE (struct, union, enum and typeof specifiers) or an
9819 ERROR_MARK. In none of these cases may there have previously
9820 been any type specifiers. */
9821 if (specs
->type
|| specs
->typespec_word
!= cts_none
9822 || specs
->long_p
|| specs
->short_p
|| specs
->signed_p
9823 || specs
->unsigned_p
|| specs
->complex_p
)
9824 error_at (loc
, "two or more data types in declaration specifiers");
9825 else if (TREE_CODE (type
) == TYPE_DECL
)
9827 if (TREE_TYPE (type
) == error_mark_node
)
9828 ; /* Allow the type to default to int to avoid cascading errors. */
9831 specs
->type
= TREE_TYPE (type
);
9832 specs
->decl_attr
= DECL_ATTRIBUTES (type
);
9833 specs
->typedef_p
= true;
9834 specs
->explicit_signed_p
= C_TYPEDEF_EXPLICITLY_SIGNED (type
);
9835 specs
->locations
[cdw_typedef
] = loc
;
9837 /* If this typedef name is defined in a struct, then a C++
9838 lookup would return a different value. */
9840 && I_SYMBOL_BINDING (DECL_NAME (type
))->in_struct
)
9841 warning_at (loc
, OPT_Wc___compat
,
9842 "C++ lookup of %qD would return a field, not a type",
9845 /* If we are parsing a struct, record that a struct field
9847 if (warn_cxx_compat
&& struct_parse_info
!= NULL
)
9848 struct_parse_info
->typedefs_seen
.safe_push (type
);
9851 else if (TREE_CODE (type
) == IDENTIFIER_NODE
)
9853 tree t
= lookup_name (type
);
9854 if (!t
|| TREE_CODE (t
) != TYPE_DECL
)
9855 error_at (loc
, "%qE fails to be a typedef or built in type", type
);
9856 else if (TREE_TYPE (t
) == error_mark_node
)
9860 specs
->type
= TREE_TYPE (t
);
9861 specs
->locations
[cdw_typespec
] = loc
;
9866 if (TREE_CODE (type
) != ERROR_MARK
&& spec
.kind
== ctsk_typeof
)
9868 specs
->typedef_p
= true;
9869 specs
->locations
[cdw_typedef
] = loc
;
9873 specs
->expr
= build2 (COMPOUND_EXPR
, TREE_TYPE (spec
.expr
),
9874 specs
->expr
, spec
.expr
);
9876 specs
->expr
= spec
.expr
;
9877 specs
->expr_const_operands
&= spec
.expr_const_operands
;
9886 /* Add the storage class specifier or function specifier SCSPEC to the
9887 declaration specifiers SPECS, returning SPECS. */
9889 struct c_declspecs
*
9890 declspecs_add_scspec (source_location loc
,
9891 struct c_declspecs
*specs
,
9895 enum c_storage_class n
= csc_none
;
9897 specs
->declspecs_seen_p
= true;
9898 gcc_assert (TREE_CODE (scspec
) == IDENTIFIER_NODE
9899 && C_IS_RESERVED_WORD (scspec
));
9900 i
= C_RID_CODE (scspec
);
9901 if (specs
->non_sc_seen_p
)
9902 warning (OPT_Wold_style_declaration
,
9903 "%qE is not at beginning of declaration", scspec
);
9907 /* C99 permits duplicate inline. Although of doubtful utility,
9908 it seems simplest to permit it in gnu89 mode as well, as
9909 there is also little utility in maintaining this as a
9910 difference between gnu89 and C99 inline. */
9912 specs
->inline_p
= true;
9913 specs
->locations
[cdw_inline
] = loc
;
9916 /* Duplicate _Noreturn is permitted. */
9918 specs
->noreturn_p
= true;
9919 specs
->locations
[cdw_noreturn
] = loc
;
9922 dupe
= specs
->thread_p
;
9923 if (specs
->storage_class
== csc_auto
)
9924 error ("%qE used with %<auto%>", scspec
);
9925 else if (specs
->storage_class
== csc_register
)
9926 error ("%qE used with %<register%>", scspec
);
9927 else if (specs
->storage_class
== csc_typedef
)
9928 error ("%qE used with %<typedef%>", scspec
);
9931 specs
->thread_p
= true;
9932 specs
->thread_gnu_p
= (strcmp (IDENTIFIER_POINTER (scspec
),
9934 /* A diagnostic is not required for the use of this
9935 identifier in the implementation namespace; only diagnose
9936 it for the C11 spelling because of existing code using
9937 the other spelling. */
9938 if (!flag_isoc11
&& !specs
->thread_gnu_p
)
9941 pedwarn (loc
, OPT_Wpedantic
,
9942 "ISO C99 does not support %qE", scspec
);
9944 pedwarn (loc
, OPT_Wpedantic
,
9945 "ISO C90 does not support %qE", scspec
);
9947 specs
->locations
[cdw_thread
] = loc
;
9955 /* Diagnose "__thread extern". */
9956 if (specs
->thread_p
&& specs
->thread_gnu_p
)
9957 error ("%<__thread%> before %<extern%>");
9964 /* Diagnose "__thread static". */
9965 if (specs
->thread_p
&& specs
->thread_gnu_p
)
9966 error ("%<__thread%> before %<static%>");
9974 if (n
!= csc_none
&& n
== specs
->storage_class
)
9978 if (i
== RID_THREAD
)
9979 error ("duplicate %<_Thread_local%> or %<__thread%>");
9981 error ("duplicate %qE", scspec
);
9985 if (specs
->storage_class
!= csc_none
&& n
!= specs
->storage_class
)
9987 error ("multiple storage classes in declaration specifiers");
9991 specs
->storage_class
= n
;
9992 specs
->locations
[cdw_storage_class
] = loc
;
9993 if (n
!= csc_extern
&& n
!= csc_static
&& specs
->thread_p
)
9995 error ("%qs used with %qE",
9996 specs
->thread_gnu_p
? "__thread" : "_Thread_local",
9998 specs
->thread_p
= false;
10005 /* Add the attributes ATTRS to the declaration specifiers SPECS,
10006 returning SPECS. */
10008 struct c_declspecs
*
10009 declspecs_add_attrs (source_location loc
, struct c_declspecs
*specs
, tree attrs
)
10011 specs
->attrs
= chainon (attrs
, specs
->attrs
);
10012 specs
->locations
[cdw_attributes
] = loc
;
10013 specs
->declspecs_seen_p
= true;
10017 /* Add an _Alignas specifier (expression ALIGN, or type whose
10018 alignment is ALIGN) to the declaration specifiers SPECS, returning
10020 struct c_declspecs
*
10021 declspecs_add_alignas (source_location loc
,
10022 struct c_declspecs
*specs
, tree align
)
10025 specs
->alignas_p
= true;
10026 specs
->locations
[cdw_alignas
] = loc
;
10027 if (align
== error_mark_node
)
10029 align_log
= check_user_alignment (align
, true);
10030 if (align_log
> specs
->align_log
)
10031 specs
->align_log
= align_log
;
10035 /* Combine "long", "short", "signed", "unsigned" and "_Complex" type
10036 specifiers with any other type specifier to determine the resulting
10037 type. This is where ISO C checks on complex types are made, since
10038 "_Complex long" is a prefix of the valid ISO C type "_Complex long
10041 struct c_declspecs
*
10042 finish_declspecs (struct c_declspecs
*specs
)
10044 /* If a type was specified as a whole, we have no modifiers and are
10046 if (specs
->type
!= NULL_TREE
)
10048 gcc_assert (!specs
->long_p
&& !specs
->long_long_p
&& !specs
->short_p
10049 && !specs
->signed_p
&& !specs
->unsigned_p
10050 && !specs
->complex_p
);
10052 /* Set a dummy type. */
10053 if (TREE_CODE (specs
->type
) == ERROR_MARK
)
10054 specs
->type
= integer_type_node
;
10058 /* If none of "void", "_Bool", "char", "int", "float" or "double"
10059 has been specified, treat it as "int" unless "_Complex" is
10060 present and there are no other specifiers. If we just have
10061 "_Complex", it is equivalent to "_Complex double", but e.g.
10062 "_Complex short" is equivalent to "_Complex short int". */
10063 if (specs
->typespec_word
== cts_none
)
10065 if (specs
->saturating_p
)
10067 error_at (specs
->locations
[cdw_saturating
],
10068 "%<_Sat%> is used without %<_Fract%> or %<_Accum%>");
10069 if (!targetm
.fixed_point_supported_p ())
10070 error_at (specs
->locations
[cdw_saturating
],
10071 "fixed-point types not supported for this target");
10072 specs
->typespec_word
= cts_fract
;
10074 else if (specs
->long_p
|| specs
->short_p
10075 || specs
->signed_p
|| specs
->unsigned_p
)
10077 specs
->typespec_word
= cts_int
;
10079 else if (specs
->complex_p
)
10081 specs
->typespec_word
= cts_double
;
10082 pedwarn (specs
->locations
[cdw_complex
], OPT_Wpedantic
,
10083 "ISO C does not support plain %<complex%> meaning "
10084 "%<double complex%>");
10088 specs
->typespec_word
= cts_int
;
10089 specs
->default_int_p
= true;
10090 /* We don't diagnose this here because grokdeclarator will
10091 give more specific diagnostics according to whether it is
10092 a function definition. */
10096 /* If "signed" was specified, record this to distinguish "int" and
10097 "signed int" in the case of a bit-field with
10098 -funsigned-bitfields. */
10099 specs
->explicit_signed_p
= specs
->signed_p
;
10101 /* Now compute the actual type. */
10102 switch (specs
->typespec_word
)
10104 case cts_auto_type
:
10105 gcc_assert (!specs
->long_p
&& !specs
->short_p
10106 && !specs
->signed_p
&& !specs
->unsigned_p
10107 && !specs
->complex_p
);
10108 /* Type to be filled in later. */
10111 gcc_assert (!specs
->long_p
&& !specs
->short_p
10112 && !specs
->signed_p
&& !specs
->unsigned_p
10113 && !specs
->complex_p
);
10114 specs
->type
= void_type_node
;
10117 gcc_assert (!specs
->long_p
&& !specs
->short_p
10118 && !specs
->signed_p
&& !specs
->unsigned_p
10119 && !specs
->complex_p
);
10120 specs
->type
= boolean_type_node
;
10123 gcc_assert (!specs
->long_p
&& !specs
->short_p
);
10124 gcc_assert (!(specs
->signed_p
&& specs
->unsigned_p
));
10125 if (specs
->signed_p
)
10126 specs
->type
= signed_char_type_node
;
10127 else if (specs
->unsigned_p
)
10128 specs
->type
= unsigned_char_type_node
;
10130 specs
->type
= char_type_node
;
10131 if (specs
->complex_p
)
10133 pedwarn (specs
->locations
[cdw_complex
], OPT_Wpedantic
,
10134 "ISO C does not support complex integer types");
10135 specs
->type
= build_complex_type (specs
->type
);
10139 gcc_assert (!specs
->long_p
&& !specs
->short_p
&& !specs
->long_long_p
);
10140 gcc_assert (!(specs
->signed_p
&& specs
->unsigned_p
));
10141 specs
->type
= (specs
->unsigned_p
10142 ? int128_unsigned_type_node
10143 : int128_integer_type_node
);
10144 if (specs
->complex_p
)
10146 pedwarn (specs
->locations
[cdw_complex
], OPT_Wpedantic
,
10147 "ISO C does not support complex integer types");
10148 specs
->type
= build_complex_type (specs
->type
);
10152 gcc_assert (!(specs
->long_p
&& specs
->short_p
));
10153 gcc_assert (!(specs
->signed_p
&& specs
->unsigned_p
));
10154 if (specs
->long_long_p
)
10155 specs
->type
= (specs
->unsigned_p
10156 ? long_long_unsigned_type_node
10157 : long_long_integer_type_node
);
10158 else if (specs
->long_p
)
10159 specs
->type
= (specs
->unsigned_p
10160 ? long_unsigned_type_node
10161 : long_integer_type_node
);
10162 else if (specs
->short_p
)
10163 specs
->type
= (specs
->unsigned_p
10164 ? short_unsigned_type_node
10165 : short_integer_type_node
);
10167 specs
->type
= (specs
->unsigned_p
10168 ? unsigned_type_node
10169 : integer_type_node
);
10170 if (specs
->complex_p
)
10172 pedwarn (specs
->locations
[cdw_complex
], OPT_Wpedantic
,
10173 "ISO C does not support complex integer types");
10174 specs
->type
= build_complex_type (specs
->type
);
10178 gcc_assert (!specs
->long_p
&& !specs
->short_p
10179 && !specs
->signed_p
&& !specs
->unsigned_p
);
10180 specs
->type
= (specs
->complex_p
10181 ? complex_float_type_node
10182 : float_type_node
);
10185 gcc_assert (!specs
->long_long_p
&& !specs
->short_p
10186 && !specs
->signed_p
&& !specs
->unsigned_p
);
10189 specs
->type
= (specs
->complex_p
10190 ? complex_long_double_type_node
10191 : long_double_type_node
);
10195 specs
->type
= (specs
->complex_p
10196 ? complex_double_type_node
10197 : double_type_node
);
10202 case cts_dfloat128
:
10203 gcc_assert (!specs
->long_p
&& !specs
->long_long_p
&& !specs
->short_p
10204 && !specs
->signed_p
&& !specs
->unsigned_p
&& !specs
->complex_p
);
10205 if (specs
->typespec_word
== cts_dfloat32
)
10206 specs
->type
= dfloat32_type_node
;
10207 else if (specs
->typespec_word
== cts_dfloat64
)
10208 specs
->type
= dfloat64_type_node
;
10210 specs
->type
= dfloat128_type_node
;
10213 gcc_assert (!specs
->complex_p
);
10214 if (!targetm
.fixed_point_supported_p ())
10215 specs
->type
= integer_type_node
;
10216 else if (specs
->saturating_p
)
10218 if (specs
->long_long_p
)
10219 specs
->type
= specs
->unsigned_p
10220 ? sat_unsigned_long_long_fract_type_node
10221 : sat_long_long_fract_type_node
;
10222 else if (specs
->long_p
)
10223 specs
->type
= specs
->unsigned_p
10224 ? sat_unsigned_long_fract_type_node
10225 : sat_long_fract_type_node
;
10226 else if (specs
->short_p
)
10227 specs
->type
= specs
->unsigned_p
10228 ? sat_unsigned_short_fract_type_node
10229 : sat_short_fract_type_node
;
10231 specs
->type
= specs
->unsigned_p
10232 ? sat_unsigned_fract_type_node
10233 : sat_fract_type_node
;
10237 if (specs
->long_long_p
)
10238 specs
->type
= specs
->unsigned_p
10239 ? unsigned_long_long_fract_type_node
10240 : long_long_fract_type_node
;
10241 else if (specs
->long_p
)
10242 specs
->type
= specs
->unsigned_p
10243 ? unsigned_long_fract_type_node
10244 : long_fract_type_node
;
10245 else if (specs
->short_p
)
10246 specs
->type
= specs
->unsigned_p
10247 ? unsigned_short_fract_type_node
10248 : short_fract_type_node
;
10250 specs
->type
= specs
->unsigned_p
10251 ? unsigned_fract_type_node
10256 gcc_assert (!specs
->complex_p
);
10257 if (!targetm
.fixed_point_supported_p ())
10258 specs
->type
= integer_type_node
;
10259 else if (specs
->saturating_p
)
10261 if (specs
->long_long_p
)
10262 specs
->type
= specs
->unsigned_p
10263 ? sat_unsigned_long_long_accum_type_node
10264 : sat_long_long_accum_type_node
;
10265 else if (specs
->long_p
)
10266 specs
->type
= specs
->unsigned_p
10267 ? sat_unsigned_long_accum_type_node
10268 : sat_long_accum_type_node
;
10269 else if (specs
->short_p
)
10270 specs
->type
= specs
->unsigned_p
10271 ? sat_unsigned_short_accum_type_node
10272 : sat_short_accum_type_node
;
10274 specs
->type
= specs
->unsigned_p
10275 ? sat_unsigned_accum_type_node
10276 : sat_accum_type_node
;
10280 if (specs
->long_long_p
)
10281 specs
->type
= specs
->unsigned_p
10282 ? unsigned_long_long_accum_type_node
10283 : long_long_accum_type_node
;
10284 else if (specs
->long_p
)
10285 specs
->type
= specs
->unsigned_p
10286 ? unsigned_long_accum_type_node
10287 : long_accum_type_node
;
10288 else if (specs
->short_p
)
10289 specs
->type
= specs
->unsigned_p
10290 ? unsigned_short_accum_type_node
10291 : short_accum_type_node
;
10293 specs
->type
= specs
->unsigned_p
10294 ? unsigned_accum_type_node
10299 gcc_unreachable ();
10305 /* A subroutine of c_write_global_declarations. Perform final processing
10306 on one file scope's declarations (or the external scope's declarations),
10310 c_write_global_declarations_1 (tree globals
)
10315 /* Process the decls in the order they were written. */
10316 for (decl
= globals
; decl
; decl
= DECL_CHAIN (decl
))
10318 /* Check for used but undefined static functions using the C
10319 standard's definition of "used", and set TREE_NO_WARNING so
10320 that check_global_declarations doesn't repeat the check. */
10321 if (TREE_CODE (decl
) == FUNCTION_DECL
10322 && DECL_INITIAL (decl
) == 0
10323 && DECL_EXTERNAL (decl
)
10324 && !TREE_PUBLIC (decl
)
10325 && C_DECL_USED (decl
))
10327 pedwarn (input_location
, 0, "%q+F used but never defined", decl
);
10328 TREE_NO_WARNING (decl
) = 1;
10331 wrapup_global_declaration_1 (decl
);
10336 reconsider
= false;
10337 for (decl
= globals
; decl
; decl
= DECL_CHAIN (decl
))
10338 reconsider
|= wrapup_global_declaration_2 (decl
);
10340 while (reconsider
);
10342 for (decl
= globals
; decl
; decl
= DECL_CHAIN (decl
))
10343 check_global_declaration_1 (decl
);
10346 /* A subroutine of c_write_global_declarations Emit debug information for each
10347 of the declarations in GLOBALS. */
10350 c_write_global_declarations_2 (tree globals
)
10354 for (decl
= globals
; decl
; decl
= DECL_CHAIN (decl
))
10355 debug_hooks
->global_decl (decl
);
10358 /* Callback to collect a source_ref from a DECL. */
10361 collect_source_ref_cb (tree decl
)
10363 if (!DECL_IS_BUILTIN (decl
))
10364 collect_source_ref (LOCATION_FILE (decl_sloc (decl
, false)));
10367 /* Preserve the external declarations scope across a garbage collect. */
10368 static GTY(()) tree ext_block
;
10370 /* Collect all references relevant to SOURCE_FILE. */
10373 collect_all_refs (const char *source_file
)
10378 FOR_EACH_VEC_ELT (*all_translation_units
, i
, t
)
10379 collect_ada_nodes (BLOCK_VARS (DECL_INITIAL (t
)), source_file
);
10381 collect_ada_nodes (BLOCK_VARS (ext_block
), source_file
);
10384 /* Iterate over all global declarations and call CALLBACK. */
10387 for_each_global_decl (void (*callback
) (tree decl
))
10394 FOR_EACH_VEC_ELT (*all_translation_units
, i
, t
)
10396 decls
= DECL_INITIAL (t
);
10397 for (decl
= BLOCK_VARS (decls
); decl
; decl
= TREE_CHAIN (decl
))
10401 for (decl
= BLOCK_VARS (ext_block
); decl
; decl
= TREE_CHAIN (decl
))
10406 c_write_global_declarations (void)
10411 /* We don't want to do this if generating a PCH. */
10415 timevar_start (TV_PHASE_DEFERRED
);
10417 /* Do the Objective-C stuff. This is where all the Objective-C
10418 module stuff gets generated (symtab, class/protocol/selector
10420 if (c_dialect_objc ())
10421 objc_write_global_declarations ();
10423 /* Close the external scope. */
10424 ext_block
= pop_scope ();
10425 external_scope
= 0;
10426 gcc_assert (!current_scope
);
10428 /* Handle -fdump-ada-spec[-slim]. */
10429 if (flag_dump_ada_spec
|| flag_dump_ada_spec_slim
)
10431 /* Build a table of files to generate specs for */
10432 if (flag_dump_ada_spec_slim
)
10433 collect_source_ref (main_input_filename
);
10435 for_each_global_decl (collect_source_ref_cb
);
10437 dump_ada_specs (collect_all_refs
, NULL
);
10442 tree tmp
= BLOCK_VARS (ext_block
);
10444 FILE * stream
= dump_begin (TDI_tu
, &flags
);
10447 dump_node (tmp
, flags
& ~TDF_SLIM
, stream
);
10448 dump_end (TDI_tu
, stream
);
10452 /* Process all file scopes in this compilation, and the external_scope,
10453 through wrapup_global_declarations and check_global_declarations. */
10454 FOR_EACH_VEC_ELT (*all_translation_units
, i
, t
)
10455 c_write_global_declarations_1 (BLOCK_VARS (DECL_INITIAL (t
)));
10456 c_write_global_declarations_1 (BLOCK_VARS (ext_block
));
10458 timevar_stop (TV_PHASE_DEFERRED
);
10459 timevar_start (TV_PHASE_OPT_GEN
);
10461 /* We're done parsing; proceed to optimize and emit assembly.
10462 FIXME: shouldn't be the front end's responsibility to call this. */
10463 finalize_compilation_unit ();
10465 timevar_stop (TV_PHASE_OPT_GEN
);
10466 timevar_start (TV_PHASE_DBGINFO
);
10468 /* After cgraph has had a chance to emit everything that's going to
10469 be emitted, output debug information for globals. */
10470 if (!seen_error ())
10472 timevar_push (TV_SYMOUT
);
10473 FOR_EACH_VEC_ELT (*all_translation_units
, i
, t
)
10474 c_write_global_declarations_2 (BLOCK_VARS (DECL_INITIAL (t
)));
10475 c_write_global_declarations_2 (BLOCK_VARS (ext_block
));
10476 timevar_pop (TV_SYMOUT
);
10480 timevar_stop (TV_PHASE_DBGINFO
);
10483 /* Register reserved keyword WORD as qualifier for address space AS. */
10486 c_register_addr_space (const char *word
, addr_space_t as
)
10488 int rid
= RID_FIRST_ADDR_SPACE
+ as
;
10491 /* Address space qualifiers are only supported
10492 in C with GNU extensions enabled. */
10493 if (c_dialect_objc () || flag_no_asm
)
10496 id
= get_identifier (word
);
10497 C_SET_RID_CODE (id
, rid
);
10498 C_IS_RESERVED_WORD (id
) = 1;
10499 ridpointers
[rid
] = id
;
10502 /* Return identifier to look up for omp declare reduction. */
10505 c_omp_reduction_id (enum tree_code reduction_code
, tree reduction_id
)
10507 const char *p
= NULL
;
10508 switch (reduction_code
)
10510 case PLUS_EXPR
: p
= "+"; break;
10511 case MULT_EXPR
: p
= "*"; break;
10512 case MINUS_EXPR
: p
= "-"; break;
10513 case BIT_AND_EXPR
: p
= "&"; break;
10514 case BIT_XOR_EXPR
: p
= "^"; break;
10515 case BIT_IOR_EXPR
: p
= "|"; break;
10516 case TRUTH_ANDIF_EXPR
: p
= "&&"; break;
10517 case TRUTH_ORIF_EXPR
: p
= "||"; break;
10518 case MIN_EXPR
: p
= "min"; break;
10519 case MAX_EXPR
: p
= "max"; break;
10526 if (TREE_CODE (reduction_id
) != IDENTIFIER_NODE
)
10527 return error_mark_node
;
10528 p
= IDENTIFIER_POINTER (reduction_id
);
10531 const char prefix
[] = "omp declare reduction ";
10532 size_t lenp
= sizeof (prefix
);
10533 size_t len
= strlen (p
);
10534 char *name
= XALLOCAVEC (char, lenp
+ len
);
10535 memcpy (name
, prefix
, lenp
- 1);
10536 memcpy (name
+ lenp
- 1, p
, len
+ 1);
10537 return get_identifier (name
);
10540 /* Lookup REDUCTION_ID in the current scope, or create an artificial
10541 VAR_DECL, bind it into the current scope and return it. */
10544 c_omp_reduction_decl (tree reduction_id
)
10546 struct c_binding
*b
= I_SYMBOL_BINDING (reduction_id
);
10547 if (b
!= NULL
&& B_IN_CURRENT_SCOPE (b
))
10550 tree decl
= build_decl (BUILTINS_LOCATION
, VAR_DECL
,
10551 reduction_id
, integer_type_node
);
10552 DECL_ARTIFICIAL (decl
) = 1;
10553 DECL_EXTERNAL (decl
) = 1;
10554 TREE_STATIC (decl
) = 1;
10555 TREE_PUBLIC (decl
) = 0;
10556 bind (reduction_id
, decl
, current_scope
, true, false, BUILTINS_LOCATION
);
10560 /* Lookup REDUCTION_ID in the first scope where it has entry for TYPE. */
10563 c_omp_reduction_lookup (tree reduction_id
, tree type
)
10565 struct c_binding
*b
= I_SYMBOL_BINDING (reduction_id
);
10569 for (t
= DECL_INITIAL (b
->decl
); t
; t
= TREE_CHAIN (t
))
10570 if (comptypes (TREE_PURPOSE (t
), type
))
10571 return TREE_VALUE (t
);
10574 return error_mark_node
;
10577 /* Helper function called via walk_tree, to diagnose invalid
10578 #pragma omp declare reduction combiners or initializers. */
10581 c_check_omp_declare_reduction_r (tree
*tp
, int *, void *data
)
10583 tree
*vars
= (tree
*) data
;
10584 if (SSA_VAR_P (*tp
)
10585 && !DECL_ARTIFICIAL (*tp
)
10589 location_t loc
= DECL_SOURCE_LOCATION (vars
[0]);
10590 if (strcmp (IDENTIFIER_POINTER (DECL_NAME (vars
[0])), "omp_out") == 0)
10591 error_at (loc
, "%<#pragma omp declare reduction%> combiner refers to "
10592 "variable %qD which is not %<omp_out%> nor %<omp_in%>",
10595 error_at (loc
, "%<#pragma omp declare reduction%> initializer refers "
10596 "to variable %qD which is not %<omp_priv%> nor "
10604 #include "gt-c-c-decl.h"